Root/target/linux/goldfish/patches-2.6.30/0101-android_usb-Composite-USB-gadget-driver-for-android.patch

1From 03e39e8f663c896dac11e87d96e8cb0292520e36 Mon Sep 17 00:00:00 2001
2From: Mike Lockwood <lockwood@android.com>
3Date: Tue, 2 Dec 2008 22:01:33 -0500
4Subject: [PATCH 101/134] android_usb: Composite USB gadget driver for android.
5
6Signed-off-by: Mike Lockwood <lockwood@android.com>
7
8USB: android gadget: add remote wakeup attribute to android function
9
10Add remote wakeup attribute to configuration descriptor of android
11function to advertise remote wakeup capability to host
12
13Acked-by: Allam, Suresh Reddy <sallam@qualcomm.com>
14
15Signed-off-by: Mike Lockwood <lockwood@android.com>
16
17usb gadget: link fixes for android composite gadget
18
19Signed-off-by: Mike Lockwood <lockwood@android.com>
20
21usb gadget: Fix null pointer errors in android composite driver
22
23Signed-off-by: Mike Lockwood <lockwood@android.com>
24---
25 drivers/usb/gadget/Kconfig | 8 +
26 drivers/usb/gadget/Makefile | 2 +
27 drivers/usb/gadget/android.c | 345 +++++
28 drivers/usb/gadget/f_adb.c | 668 ++++++++
29 drivers/usb/gadget/f_adb.h | 25 +
30 drivers/usb/gadget/f_mass_storage.c | 2906 +++++++++++++++++++++++++++++++++++
31 drivers/usb/gadget/f_mass_storage.h | 52 +
32 include/linux/usb/android.h | 40 +
33 8 files changed, 4046 insertions(+), 0 deletions(-)
34 create mode 100644 drivers/usb/gadget/android.c
35 create mode 100644 drivers/usb/gadget/f_adb.c
36 create mode 100644 drivers/usb/gadget/f_adb.h
37 create mode 100644 drivers/usb/gadget/f_mass_storage.c
38 create mode 100644 drivers/usb/gadget/f_mass_storage.h
39 create mode 100644 include/linux/usb/android.h
40
41--- a/drivers/usb/gadget/Kconfig
42+++ b/drivers/usb/gadget/Kconfig
43@@ -700,6 +700,14 @@ config USB_G_PRINTER
44       For more information, see Documentation/usb/gadget_printer.txt
45       which includes sample code for accessing the device file.
46 
47+config USB_ANDROID
48+ tristate "Android Gadget"
49+ help
50+ The Android gadget provides mass storage and adb transport.
51+
52+ Say "y" to link the driver statically, or "m" to build a
53+ dynamically linked module called "g_android".
54+
55 config USB_CDC_COMPOSITE
56     tristate "CDC Composite Device (Ethernet and ACM)"
57     depends on NET
58--- a/drivers/usb/gadget/Makefile
59+++ b/drivers/usb/gadget/Makefile
60@@ -33,6 +33,7 @@ gadgetfs-objs := inode.o
61 g_file_storage-objs := file_storage.o
62 g_printer-objs := printer.o
63 g_cdc-objs := cdc2.o
64+g_android-objs := android.o f_adb.o f_mass_storage.o
65 
66 obj-$(CONFIG_USB_ZERO) += g_zero.o
67 obj-$(CONFIG_USB_ETH) += g_ether.o
68@@ -42,4 +43,5 @@ obj-$(CONFIG_USB_G_SERIAL) += g_serial.o
69 obj-$(CONFIG_USB_G_PRINTER) += g_printer.o
70 obj-$(CONFIG_USB_MIDI_GADGET) += g_midi.o
71 obj-$(CONFIG_USB_CDC_COMPOSITE) += g_cdc.o
72+obj-$(CONFIG_USB_ANDROID) += g_android.o
73 
74--- /dev/null
75+++ b/drivers/usb/gadget/android.c
76@@ -0,0 +1,345 @@
77+/*
78+ * Gadget Driver for Android
79+ *
80+ * Copyright (C) 2008 Google, Inc.
81+ * Author: Mike Lockwood <lockwood@android.com>
82+ *
83+ * This software is licensed under the terms of the GNU General Public
84+ * License version 2, as published by the Free Software Foundation, and
85+ * may be copied, distributed, and modified under those terms.
86+ *
87+ * This program is distributed in the hope that it will be useful,
88+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
89+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
90+ * GNU General Public License for more details.
91+ *
92+ */
93+
94+/* #define DEBUG */
95+/* #define VERBOSE_DEBUG */
96+
97+#include <linux/init.h>
98+#include <linux/module.h>
99+#include <linux/fs.h>
100+
101+#include <linux/delay.h>
102+#include <linux/kernel.h>
103+#include <linux/utsname.h>
104+#include <linux/miscdevice.h>
105+#include <linux/platform_device.h>
106+
107+#include <linux/usb/android.h>
108+#include <linux/usb/ch9.h>
109+#include <linux/usb/composite.h>
110+#include <linux/usb/gadget.h>
111+
112+#include "f_mass_storage.h"
113+#include "f_adb.h"
114+
115+#include "gadget_chips.h"
116+
117+/*
118+ * Kbuild is not very cooperative with respect to linking separately
119+ * compiled library objects into one module. So for now we won't use
120+ * separate compilation ... ensuring init/exit sections work to shrink
121+ * the runtime footprint, and giving us at least some parts of what
122+ * a "gcc --combine ... part1.c part2.c part3.c ... " build would.
123+ */
124+#include "usbstring.c"
125+#include "config.c"
126+#include "epautoconf.c"
127+#include "composite.c"
128+
129+MODULE_AUTHOR("Mike Lockwood");
130+MODULE_DESCRIPTION("Android Composite USB Driver");
131+MODULE_LICENSE("GPL");
132+MODULE_VERSION("1.0");
133+
134+static const char longname[] = "Gadget Android";
135+
136+/* Default vendor and product IDs, overridden by platform data */
137+#define VENDOR_ID 0x18D1
138+#define PRODUCT_ID 0x0001
139+#define ADB_PRODUCT_ID 0x0002
140+
141+struct android_dev {
142+ struct usb_gadget *gadget;
143+ struct usb_composite_dev *cdev;
144+
145+ int product_id;
146+ int adb_product_id;
147+ int version;
148+
149+ int adb_enabled;
150+ int nluns;
151+};
152+
153+static atomic_t adb_enable_excl;
154+static struct android_dev *_android_dev;
155+
156+/* string IDs are assigned dynamically */
157+
158+#define STRING_MANUFACTURER_IDX 0
159+#define STRING_PRODUCT_IDX 1
160+#define STRING_SERIAL_IDX 2
161+
162+/* String Table */
163+static struct usb_string strings_dev[] = {
164+ /* These dummy values should be overridden by platform data */
165+ [STRING_MANUFACTURER_IDX].s = "Android",
166+ [STRING_PRODUCT_IDX].s = "Android",
167+ [STRING_SERIAL_IDX].s = "0123456789ABCDEF",
168+ { } /* end of list */
169+};
170+
171+static struct usb_gadget_strings stringtab_dev = {
172+ .language = 0x0409, /* en-us */
173+ .strings = strings_dev,
174+};
175+
176+static struct usb_gadget_strings *dev_strings[] = {
177+ &stringtab_dev,
178+ NULL,
179+};
180+
181+static struct usb_device_descriptor device_desc = {
182+ .bLength = sizeof(device_desc),
183+ .bDescriptorType = USB_DT_DEVICE,
184+ .bcdUSB = __constant_cpu_to_le16(0x0200),
185+ .bDeviceClass = USB_CLASS_PER_INTERFACE,
186+ .idVendor = __constant_cpu_to_le16(VENDOR_ID),
187+ .idProduct = __constant_cpu_to_le16(PRODUCT_ID),
188+ .bcdDevice = __constant_cpu_to_le16(0xffff),
189+ .bNumConfigurations = 1,
190+};
191+
192+static int __init android_bind_config(struct usb_configuration *c)
193+{
194+ struct android_dev *dev = _android_dev;
195+ int ret;
196+ printk(KERN_DEBUG "android_bind_config\n");
197+
198+ ret = mass_storage_function_add(dev->cdev, c, dev->nluns);
199+ if (ret)
200+ return ret;
201+ return adb_function_add(dev->cdev, c);
202+}
203+
204+static struct usb_configuration android_config_driver = {
205+ .label = "android",
206+ .bind = android_bind_config,
207+ .bConfigurationValue = 1,
208+ .bmAttributes = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
209+ .bMaxPower = 0x80, /* 250ma */
210+};
211+
212+static int __init android_bind(struct usb_composite_dev *cdev)
213+{
214+ struct android_dev *dev = _android_dev;
215+ struct usb_gadget *gadget = cdev->gadget;
216+ int gcnum;
217+ int id;
218+ int ret;
219+
220+ printk(KERN_INFO "android_bind\n");
221+
222+ /* Allocate string descriptor numbers ... note that string
223+ * contents can be overridden by the composite_dev glue.
224+ */
225+ id = usb_string_id(cdev);
226+ if (id < 0)
227+ return id;
228+ strings_dev[STRING_MANUFACTURER_IDX].id = id;
229+ device_desc.iManufacturer = id;
230+
231+ id = usb_string_id(cdev);
232+ if (id < 0)
233+ return id;
234+ strings_dev[STRING_PRODUCT_IDX].id = id;
235+ device_desc.iProduct = id;
236+
237+ id = usb_string_id(cdev);
238+ if (id < 0)
239+ return id;
240+ strings_dev[STRING_SERIAL_IDX].id = id;
241+ device_desc.iSerialNumber = id;
242+
243+ if (gadget->ops->wakeup)
244+ android_config_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
245+
246+ /* register our configuration */
247+ ret = usb_add_config(cdev, &android_config_driver);
248+ if (ret) {
249+ printk(KERN_ERR "usb_add_config failed\n");
250+ return ret;
251+ }
252+
253+ gcnum = usb_gadget_controller_number(gadget);
254+ if (gcnum >= 0)
255+ device_desc.bcdDevice = cpu_to_le16(0x0200 + gcnum);
256+ else {
257+ /* gadget zero is so simple (for now, no altsettings) that
258+ * it SHOULD NOT have problems with bulk-capable hardware.
259+ * so just warn about unrcognized controllers -- don't panic.
260+ *
261+ * things like configuration and altsetting numbering
262+ * can need hardware-specific attention though.
263+ */
264+ pr_warning("%s: controller '%s' not recognized\n",
265+ longname, gadget->name);
266+ device_desc.bcdDevice = __constant_cpu_to_le16(0x9999);
267+ }
268+
269+ usb_gadget_set_selfpowered(gadget);
270+ dev->cdev = cdev;
271+
272+ return 0;
273+}
274+
275+static struct usb_composite_driver android_usb_driver = {
276+ .name = "android_usb",
277+ .dev = &device_desc,
278+ .strings = dev_strings,
279+ .bind = android_bind,
280+};
281+
282+static void enable_adb(struct android_dev *dev, int enable)
283+{
284+ if (enable != dev->adb_enabled) {
285+ dev->adb_enabled = enable;
286+ adb_function_enable(enable);
287+
288+ /* set product ID to the appropriate value */
289+ if (enable)
290+ device_desc.idProduct =
291+ __constant_cpu_to_le16(dev->adb_product_id);
292+ else
293+ device_desc.idProduct =
294+ __constant_cpu_to_le16(dev->product_id);
295+ if (dev->cdev)
296+ dev->cdev->desc.idProduct = device_desc.idProduct;
297+
298+ /* force reenumeration */
299+ if (dev->cdev && dev->cdev->gadget &&
300+ dev->cdev->gadget->speed != USB_SPEED_UNKNOWN) {
301+ usb_gadget_disconnect(dev->cdev->gadget);
302+ msleep(10);
303+ usb_gadget_connect(dev->cdev->gadget);
304+ }
305+ }
306+}
307+
308+static int adb_enable_open(struct inode *ip, struct file *fp)
309+{
310+ if (atomic_inc_return(&adb_enable_excl) != 1) {
311+ atomic_dec(&adb_enable_excl);
312+ return -EBUSY;
313+ }
314+
315+ printk(KERN_INFO "enabling adb\n");
316+ enable_adb(_android_dev, 1);
317+
318+ return 0;
319+}
320+
321+static int adb_enable_release(struct inode *ip, struct file *fp)
322+{
323+ printk(KERN_INFO "disabling adb\n");
324+ enable_adb(_android_dev, 0);
325+ atomic_dec(&adb_enable_excl);
326+ return 0;
327+}
328+
329+static struct file_operations adb_enable_fops = {
330+ .owner = THIS_MODULE,
331+ .open = adb_enable_open,
332+ .release = adb_enable_release,
333+};
334+
335+static struct miscdevice adb_enable_device = {
336+ .minor = MISC_DYNAMIC_MINOR,
337+ .name = "android_adb_enable",
338+ .fops = &adb_enable_fops,
339+};
340+
341+static int __init android_probe(struct platform_device *pdev)
342+{
343+ struct android_usb_platform_data *pdata = pdev->dev.platform_data;
344+ struct android_dev *dev = _android_dev;
345+
346+ printk(KERN_INFO "android_probe pdata: %p\n", pdata);
347+
348+ if (pdata) {
349+ if (pdata->vendor_id)
350+ device_desc.idVendor =
351+ __constant_cpu_to_le16(pdata->vendor_id);
352+ if (pdata->product_id) {
353+ dev->product_id = pdata->product_id;
354+ device_desc.idProduct =
355+ __constant_cpu_to_le16(pdata->product_id);
356+ }
357+ if (pdata->adb_product_id)
358+ dev->adb_product_id = pdata->adb_product_id;
359+ if (pdata->version)
360+ dev->version = pdata->version;
361+
362+ if (pdata->product_name)
363+ strings_dev[STRING_PRODUCT_IDX].s = pdata->product_name;
364+ if (pdata->manufacturer_name)
365+ strings_dev[STRING_MANUFACTURER_IDX].s =
366+ pdata->manufacturer_name;
367+ if (pdata->serial_number)
368+ strings_dev[STRING_SERIAL_IDX].s = pdata->serial_number;
369+ dev->nluns = pdata->nluns;
370+ }
371+
372+ return 0;
373+}
374+
375+static struct platform_driver android_platform_driver = {
376+ .driver = { .name = "android_usb", },
377+ .probe = android_probe,
378+};
379+
380+static int __init init(void)
381+{
382+ struct android_dev *dev;
383+ int ret;
384+
385+ printk(KERN_INFO "android init\n");
386+
387+ dev = kzalloc(sizeof(*dev), GFP_KERNEL);
388+ if (!dev)
389+ return -ENOMEM;
390+
391+ /* set default values, which should be overridden by platform data */
392+ dev->product_id = PRODUCT_ID;
393+ dev->adb_product_id = ADB_PRODUCT_ID;
394+ _android_dev = dev;
395+
396+ ret = platform_driver_register(&android_platform_driver);
397+ if (ret)
398+ return ret;
399+ ret = misc_register(&adb_enable_device);
400+ if (ret) {
401+ platform_driver_unregister(&android_platform_driver);
402+ return ret;
403+ }
404+ ret = usb_composite_register(&android_usb_driver);
405+ if (ret) {
406+ misc_deregister(&adb_enable_device);
407+ platform_driver_unregister(&android_platform_driver);
408+ }
409+ return ret;
410+}
411+module_init(init);
412+
413+static void __exit cleanup(void)
414+{
415+ usb_composite_unregister(&android_usb_driver);
416+ misc_deregister(&adb_enable_device);
417+ platform_driver_unregister(&android_platform_driver);
418+ kfree(_android_dev);
419+ _android_dev = NULL;
420+}
421+module_exit(cleanup);
422--- /dev/null
423+++ b/drivers/usb/gadget/f_adb.c
424@@ -0,0 +1,668 @@
425+/*
426+ * Gadget Driver for Android ADB
427+ *
428+ * Copyright (C) 2008 Google, Inc.
429+ * Author: Mike Lockwood <lockwood@android.com>
430+ *
431+ * This software is licensed under the terms of the GNU General Public
432+ * License version 2, as published by the Free Software Foundation, and
433+ * may be copied, distributed, and modified under those terms.
434+ *
435+ * This program is distributed in the hope that it will be useful,
436+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
437+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
438+ * GNU General Public License for more details.
439+ *
440+ */
441+
442+/* #define DEBUG */
443+/* #define VERBOSE_DEBUG */
444+
445+#include <linux/module.h>
446+#include <linux/init.h>
447+#include <linux/poll.h>
448+#include <linux/delay.h>
449+#include <linux/wait.h>
450+#include <linux/err.h>
451+#include <linux/interrupt.h>
452+
453+#include <linux/types.h>
454+#include <linux/device.h>
455+#include <linux/miscdevice.h>
456+
457+#include <linux/usb/ch9.h>
458+#include <linux/usb/composite.h>
459+#include <linux/usb/gadget.h>
460+
461+#include "f_adb.h"
462+
463+#define BULK_BUFFER_SIZE 4096
464+
465+/* number of rx and tx requests to allocate */
466+#define RX_REQ_MAX 4
467+#define TX_REQ_MAX 4
468+
469+static const char shortname[] = "android_adb";
470+
471+struct adb_dev {
472+ struct usb_function function;
473+ struct usb_composite_dev *cdev;
474+ spinlock_t lock;
475+
476+ struct usb_ep *ep_in;
477+ struct usb_ep *ep_out;
478+
479+ int online;
480+ int error;
481+
482+ atomic_t read_excl;
483+ atomic_t write_excl;
484+ atomic_t open_excl;
485+
486+ struct list_head tx_idle;
487+ struct list_head rx_idle;
488+ struct list_head rx_done;
489+
490+ wait_queue_head_t read_wq;
491+ wait_queue_head_t write_wq;
492+
493+ /* the request we're currently reading from */
494+ struct usb_request *read_req;
495+ unsigned char *read_buf;
496+ unsigned read_count;
497+};
498+
499+static struct usb_interface_descriptor adb_interface_desc = {
500+ .bLength = USB_DT_INTERFACE_SIZE,
501+ .bDescriptorType = USB_DT_INTERFACE,
502+ .bInterfaceNumber = 0,
503+ .bNumEndpoints = 2,
504+ .bInterfaceClass = 0xFF,
505+ .bInterfaceSubClass = 0x42,
506+ .bInterfaceProtocol = 1,
507+};
508+
509+static struct usb_endpoint_descriptor adb_highspeed_in_desc = {
510+ .bLength = USB_DT_ENDPOINT_SIZE,
511+ .bDescriptorType = USB_DT_ENDPOINT,
512+ .bEndpointAddress = USB_DIR_IN,
513+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
514+ .wMaxPacketSize = __constant_cpu_to_le16(512),
515+};
516+
517+static struct usb_endpoint_descriptor adb_highspeed_out_desc = {
518+ .bLength = USB_DT_ENDPOINT_SIZE,
519+ .bDescriptorType = USB_DT_ENDPOINT,
520+ .bEndpointAddress = USB_DIR_OUT,
521+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
522+ .wMaxPacketSize = __constant_cpu_to_le16(512),
523+};
524+
525+static struct usb_endpoint_descriptor adb_fullspeed_in_desc = {
526+ .bLength = USB_DT_ENDPOINT_SIZE,
527+ .bDescriptorType = USB_DT_ENDPOINT,
528+ .bEndpointAddress = USB_DIR_IN,
529+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
530+};
531+
532+static struct usb_endpoint_descriptor adb_fullspeed_out_desc = {
533+ .bLength = USB_DT_ENDPOINT_SIZE,
534+ .bDescriptorType = USB_DT_ENDPOINT,
535+ .bEndpointAddress = USB_DIR_OUT,
536+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
537+};
538+
539+static struct usb_descriptor_header *fs_adb_descs[] = {
540+ (struct usb_descriptor_header *) &adb_interface_desc,
541+ (struct usb_descriptor_header *) &adb_fullspeed_in_desc,
542+ (struct usb_descriptor_header *) &adb_fullspeed_out_desc,
543+ NULL,
544+};
545+
546+static struct usb_descriptor_header *hs_adb_descs[] = {
547+ (struct usb_descriptor_header *) &adb_interface_desc,
548+ (struct usb_descriptor_header *) &adb_highspeed_in_desc,
549+ (struct usb_descriptor_header *) &adb_highspeed_out_desc,
550+ NULL,
551+};
552+
553+/* used when adb function is disabled */
554+static struct usb_descriptor_header *null_adb_descs[] = {
555+ NULL,
556+};
557+
558+
559+/* temporary variable used between adb_open() and adb_gadget_bind() */
560+static struct adb_dev *_adb_dev;
561+
562+static inline struct adb_dev *func_to_dev(struct usb_function *f)
563+{
564+ return container_of(f, struct adb_dev, function);
565+}
566+
567+
568+static struct usb_request *adb_request_new(struct usb_ep *ep, int buffer_size)
569+{
570+ struct usb_request *req = usb_ep_alloc_request(ep, GFP_KERNEL);
571+ if (!req)
572+ return NULL;
573+
574+ /* now allocate buffers for the requests */
575+ req->buf = kmalloc(buffer_size, GFP_KERNEL);
576+ if (!req->buf) {
577+ usb_ep_free_request(ep, req);
578+ return NULL;
579+ }
580+
581+ return req;
582+}
583+
584+static void adb_request_free(struct usb_request *req, struct usb_ep *ep)
585+{
586+ if (req) {
587+ kfree(req->buf);
588+ usb_ep_free_request(ep, req);
589+ }
590+}
591+
592+static inline int _lock(atomic_t *excl)
593+{
594+ if (atomic_inc_return(excl) == 1) {
595+ return 0;
596+ } else {
597+ atomic_dec(excl);
598+ return -1;
599+ }
600+}
601+
602+static inline void _unlock(atomic_t *excl)
603+{
604+ atomic_dec(excl);
605+}
606+
607+/* add a request to the tail of a list */
608+void req_put(struct adb_dev *dev, struct list_head *head,
609+ struct usb_request *req)
610+{
611+ unsigned long flags;
612+
613+ spin_lock_irqsave(&dev->lock, flags);
614+ list_add_tail(&req->list, head);
615+ spin_unlock_irqrestore(&dev->lock, flags);
616+}
617+
618+/* remove a request from the head of a list */
619+struct usb_request *req_get(struct adb_dev *dev, struct list_head *head)
620+{
621+ unsigned long flags;
622+ struct usb_request *req;
623+
624+ spin_lock_irqsave(&dev->lock, flags);
625+ if (list_empty(head)) {
626+ req = 0;
627+ } else {
628+ req = list_first_entry(head, struct usb_request, list);
629+ list_del(&req->list);
630+ }
631+ spin_unlock_irqrestore(&dev->lock, flags);
632+ return req;
633+}
634+
635+static void adb_complete_in(struct usb_ep *ep, struct usb_request *req)
636+{
637+ struct adb_dev *dev = _adb_dev;
638+
639+ if (req->status != 0)
640+ dev->error = 1;
641+
642+ req_put(dev, &dev->tx_idle, req);
643+
644+ wake_up(&dev->write_wq);
645+}
646+
647+static void adb_complete_out(struct usb_ep *ep, struct usb_request *req)
648+{
649+ struct adb_dev *dev = _adb_dev;
650+
651+ if (req->status != 0) {
652+ dev->error = 1;
653+ req_put(dev, &dev->rx_idle, req);
654+ } else {
655+ req_put(dev, &dev->rx_done, req);
656+ }
657+
658+ wake_up(&dev->read_wq);
659+}
660+
661+static int __init create_bulk_endpoints(struct adb_dev *dev,
662+ struct usb_endpoint_descriptor *in_desc,
663+ struct usb_endpoint_descriptor *out_desc)
664+{
665+ struct usb_composite_dev *cdev = dev->cdev;
666+ struct usb_request *req;
667+ struct usb_ep *ep;
668+ int i;
669+
670+ DBG(cdev, "create_bulk_endpoints dev: %p\n", dev);
671+
672+ ep = usb_ep_autoconfig(cdev->gadget, in_desc);
673+ if (!ep) {
674+ DBG(cdev, "usb_ep_autoconfig for ep_in failed\n");
675+ return -ENODEV;
676+ }
677+ DBG(cdev, "usb_ep_autoconfig for ep_in got %s\n", ep->name);
678+ dev->ep_in = ep;
679+
680+ ep = usb_ep_autoconfig(cdev->gadget, out_desc);
681+ if (!ep) {
682+ DBG(cdev, "usb_ep_autoconfig for ep_out failed\n");
683+ return -ENODEV;
684+ }
685+ DBG(cdev, "usb_ep_autoconfig for adb ep_out got %s\n", ep->name);
686+ dev->ep_out = ep;
687+
688+ /* now allocate requests for our endpoints */
689+ for (i = 0; i < RX_REQ_MAX; i++) {
690+ req = adb_request_new(dev->ep_out, BULK_BUFFER_SIZE);
691+ if (!req)
692+ goto fail;
693+ req->complete = adb_complete_out;
694+ req_put(dev, &dev->rx_idle, req);
695+ }
696+
697+ for (i = 0; i < TX_REQ_MAX; i++) {
698+ req = adb_request_new(dev->ep_in, BULK_BUFFER_SIZE);
699+ if (!req)
700+ goto fail;
701+ req->complete = adb_complete_in;
702+ req_put(dev, &dev->tx_idle, req);
703+ }
704+
705+ return 0;
706+
707+fail:
708+ printk(KERN_ERR "adb_bind() could not allocate requests\n");
709+ return -1;
710+}
711+
712+static ssize_t adb_read(struct file *fp, char __user *buf,
713+ size_t count, loff_t *pos)
714+{
715+ struct adb_dev *dev = fp->private_data;
716+ struct usb_composite_dev *cdev = dev->cdev;
717+ struct usb_request *req;
718+ int r = count, xfer;
719+ int ret;
720+
721+ DBG(cdev, "adb_read(%d)\n", count);
722+
723+ if (_lock(&dev->read_excl))
724+ return -EBUSY;
725+
726+ /* we will block until we're online */
727+ while (!(dev->online || dev->error)) {
728+ DBG(cdev, "adb_read: waiting for online state\n");
729+ ret = wait_event_interruptible(dev->read_wq,
730+ (dev->online || dev->error));
731+ if (ret < 0) {
732+ _unlock(&dev->read_excl);
733+ return ret;
734+ }
735+ }
736+
737+ while (count > 0) {
738+ if (dev->error) {
739+ DBG(cdev, "adb_read dev->error\n");
740+ r = -EIO;
741+ break;
742+ }
743+
744+ /* if we have idle read requests, get them queued */
745+ while ((req = req_get(dev, &dev->rx_idle))) {
746+requeue_req:
747+ req->length = BULK_BUFFER_SIZE;
748+ ret = usb_ep_queue(dev->ep_out, req, GFP_ATOMIC);
749+
750+ if (ret < 0) {
751+ r = -EIO;
752+ dev->error = 1;
753+ req_put(dev, &dev->rx_idle, req);
754+ goto fail;
755+ } else {
756+ DBG(cdev, "rx %p queue\n", req);
757+ }
758+ }
759+
760+ /* if we have data pending, give it to userspace */
761+ if (dev->read_count > 0) {
762+ if (dev->read_count < count)
763+ xfer = dev->read_count;
764+ else
765+ xfer = count;
766+
767+ if (copy_to_user(buf, dev->read_buf, xfer)) {
768+ r = -EFAULT;
769+ break;
770+ }
771+ dev->read_buf += xfer;
772+ dev->read_count -= xfer;
773+ buf += xfer;
774+ count -= xfer;
775+
776+ /* if we've emptied the buffer, release the request */
777+ if (dev->read_count == 0) {
778+ req_put(dev, &dev->rx_idle, dev->read_req);
779+ dev->read_req = 0;
780+ }
781+ continue;
782+ }
783+
784+ /* wait for a request to complete */
785+ req = 0;
786+ ret = wait_event_interruptible(dev->read_wq,
787+ ((req = req_get(dev, &dev->rx_done)) || dev->error));
788+ if (req != 0) {
789+ /* if we got a 0-len one we need to put it back into
790+ ** service. if we made it the current read req we'd
791+ ** be stuck forever
792+ */
793+ if (req->actual == 0)
794+ goto requeue_req;
795+
796+ dev->read_req = req;
797+ dev->read_count = req->actual;
798+ dev->read_buf = req->buf;
799+ DBG(cdev, "rx %p %d\n", req, req->actual);
800+ }
801+
802+ if (ret < 0) {
803+ r = ret;
804+ break;
805+ }
806+ }
807+
808+fail:
809+ _unlock(&dev->read_excl);
810+ DBG(cdev, "adb_read returning %d\n", r);
811+ return r;
812+}
813+
814+static ssize_t adb_write(struct file *fp, const char __user *buf,
815+ size_t count, loff_t *pos)
816+{
817+ struct adb_dev *dev = fp->private_data;
818+ struct usb_composite_dev *cdev = dev->cdev;
819+ struct usb_request *req = 0;
820+ int r = count, xfer;
821+ int ret;
822+
823+ DBG(cdev, "adb_write(%d)\n", count);
824+
825+ if (_lock(&dev->write_excl))
826+ return -EBUSY;
827+
828+ while (count > 0) {
829+ if (dev->error) {
830+ DBG(cdev, "adb_write dev->error\n");
831+ r = -EIO;
832+ break;
833+ }
834+
835+ /* get an idle tx request to use */
836+ req = 0;
837+ ret = wait_event_interruptible(dev->write_wq,
838+ ((req = req_get(dev, &dev->tx_idle)) || dev->error));
839+
840+ if (ret < 0) {
841+ r = ret;
842+ break;
843+ }
844+
845+ if (req != 0) {
846+ if (count > BULK_BUFFER_SIZE)
847+ xfer = BULK_BUFFER_SIZE;
848+ else
849+ xfer = count;
850+ if (copy_from_user(req->buf, buf, xfer)) {
851+ r = -EFAULT;
852+ break;
853+ }
854+
855+ req->length = xfer;
856+ ret = usb_ep_queue(dev->ep_in, req, GFP_ATOMIC);
857+ if (ret < 0) {
858+ DBG(cdev, "adb_write: xfer error %d\n", ret);
859+ dev->error = 1;
860+ r = -EIO;
861+ break;
862+ }
863+
864+ buf += xfer;
865+ count -= xfer;
866+
867+ /* zero this so we don't try to free it on error exit */
868+ req = 0;
869+ }
870+ }
871+
872+ if (req)
873+ req_put(dev, &dev->tx_idle, req);
874+
875+ _unlock(&dev->write_excl);
876+ DBG(cdev, "adb_write returning %d\n", r);
877+ return r;
878+}
879+
880+static int adb_open(struct inode *ip, struct file *fp)
881+{
882+ printk(KERN_INFO "adb_open\n");
883+ if (_lock(&_adb_dev->open_excl))
884+ return -EBUSY;
885+
886+ fp->private_data = _adb_dev;
887+
888+ /* clear the error latch */
889+ _adb_dev->error = 0;
890+
891+ return 0;
892+}
893+
894+static int adb_release(struct inode *ip, struct file *fp)
895+{
896+ printk(KERN_INFO "adb_release\n");
897+ _unlock(&_adb_dev->open_excl);
898+ return 0;
899+}
900+
901+/* file operations for ADB device /dev/android_adb */
902+static struct file_operations adb_fops = {
903+ .owner = THIS_MODULE,
904+ .read = adb_read,
905+ .write = adb_write,
906+ .open = adb_open,
907+ .release = adb_release,
908+};
909+
910+static struct miscdevice adb_device = {
911+ .minor = MISC_DYNAMIC_MINOR,
912+ .name = shortname,
913+ .fops = &adb_fops,
914+};
915+
916+static int __init
917+adb_function_bind(struct usb_configuration *c, struct usb_function *f)
918+{
919+ struct usb_composite_dev *cdev = c->cdev;
920+ struct adb_dev *dev = func_to_dev(f);
921+ int id;
922+ int ret;
923+
924+ dev->cdev = cdev;
925+ DBG(cdev, "adb_function_bind dev: %p\n", dev);
926+
927+ /* allocate interface ID(s) */
928+ id = usb_interface_id(c, f);
929+ if (id < 0)
930+ return id;
931+ adb_interface_desc.bInterfaceNumber = id;
932+
933+ /* allocate endpoints */
934+ ret = create_bulk_endpoints(dev, &adb_fullspeed_in_desc,
935+ &adb_fullspeed_out_desc);
936+ if (ret)
937+ return ret;
938+
939+ /* support high speed hardware */
940+ if (gadget_is_dualspeed(c->cdev->gadget)) {
941+ adb_highspeed_in_desc.bEndpointAddress =
942+ adb_fullspeed_in_desc.bEndpointAddress;
943+ adb_highspeed_out_desc.bEndpointAddress =
944+ adb_fullspeed_out_desc.bEndpointAddress;
945+ }
946+
947+ DBG(cdev, "%s speed %s: IN/%s, OUT/%s\n",
948+ gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full",
949+ f->name, dev->ep_in->name, dev->ep_out->name);
950+ return 0;
951+}
952+
953+static void
954+adb_function_unbind(struct usb_configuration *c, struct usb_function *f)
955+{
956+ struct adb_dev *dev = func_to_dev(f);
957+ struct usb_request *req;
958+
959+ spin_lock_irq(&dev->lock);
960+
961+ while ((req = req_get(dev, &dev->rx_idle)))
962+ adb_request_free(req, dev->ep_out);
963+ while ((req = req_get(dev, &dev->tx_idle)))
964+ adb_request_free(req, dev->ep_in);
965+
966+ dev->online = 0;
967+ dev->error = 1;
968+ spin_unlock_irq(&dev->lock);
969+
970+ misc_deregister(&adb_device);
971+ kfree(_adb_dev);
972+ _adb_dev = NULL;
973+}
974+
975+static int adb_function_set_alt(struct usb_function *f,
976+ unsigned intf, unsigned alt)
977+{
978+ struct adb_dev *dev = func_to_dev(f);
979+ struct usb_composite_dev *cdev = f->config->cdev;
980+ int ret;
981+
982+ DBG(cdev, "adb_function_set_alt intf: %d alt: %d\n", intf, alt);
983+ ret = usb_ep_enable(dev->ep_in,
984+ ep_choose(cdev->gadget,
985+ &adb_highspeed_in_desc,
986+ &adb_fullspeed_in_desc));
987+ if (ret)
988+ return ret;
989+ ret = usb_ep_enable(dev->ep_out,
990+ ep_choose(cdev->gadget,
991+ &adb_highspeed_out_desc,
992+ &adb_fullspeed_out_desc));
993+ if (ret) {
994+ usb_ep_disable(dev->ep_in);
995+ return ret;
996+ }
997+ dev->online = 1;
998+
999+ /* readers may be blocked waiting for us to go online */
1000+ wake_up(&dev->read_wq);
1001+ return 0;
1002+}
1003+
1004+static void adb_function_disable(struct usb_function *f)
1005+{
1006+ struct adb_dev *dev = func_to_dev(f);
1007+ struct usb_composite_dev *cdev = dev->cdev;
1008+
1009+ DBG(cdev, "adb_function_disable\n");
1010+ dev->online = 0;
1011+ dev->error = 1;
1012+ usb_ep_disable(dev->ep_in);
1013+ usb_ep_disable(dev->ep_out);
1014+
1015+ /* readers may be blocked waiting for us to go online */
1016+ wake_up(&dev->read_wq);
1017+
1018+ VDBG(cdev, "%s disabled\n", dev->function.name);
1019+}
1020+
1021+int __init adb_function_add(struct usb_composite_dev *cdev,
1022+ struct usb_configuration *c)
1023+{
1024+ struct adb_dev *dev;
1025+ int ret;
1026+
1027+ printk(KERN_INFO "adb_function_add\n");
1028+
1029+ dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1030+ if (!dev)
1031+ return -ENOMEM;
1032+
1033+ spin_lock_init(&dev->lock);
1034+
1035+ init_waitqueue_head(&dev->read_wq);
1036+ init_waitqueue_head(&dev->write_wq);
1037+
1038+ atomic_set(&dev->open_excl, 0);
1039+ atomic_set(&dev->read_excl, 0);
1040+ atomic_set(&dev->write_excl, 0);
1041+
1042+ INIT_LIST_HEAD(&dev->rx_idle);
1043+ INIT_LIST_HEAD(&dev->rx_done);
1044+ INIT_LIST_HEAD(&dev->tx_idle);
1045+
1046+ dev->cdev = cdev;
1047+ dev->function.name = "adb";
1048+ dev->function.descriptors = null_adb_descs;
1049+ dev->function.hs_descriptors = null_adb_descs;
1050+ dev->function.bind = adb_function_bind;
1051+ dev->function.unbind = adb_function_unbind;
1052+ dev->function.set_alt = adb_function_set_alt;
1053+ dev->function.disable = adb_function_disable;
1054+
1055+ /* _adb_dev must be set before calling usb_gadget_register_driver */
1056+ _adb_dev = dev;
1057+
1058+ ret = misc_register(&adb_device);
1059+ if (ret)
1060+ goto err1;
1061+ ret = usb_add_function(c, &dev->function);
1062+ if (ret)
1063+ goto err2;
1064+
1065+ return 0;
1066+
1067+err2:
1068+ misc_deregister(&adb_device);
1069+err1:
1070+ kfree(dev);
1071+ printk(KERN_ERR "adb gadget driver failed to initialize\n");
1072+ return ret;
1073+}
1074+
1075+void adb_function_enable(int enable)
1076+{
1077+ struct adb_dev *dev = _adb_dev;
1078+
1079+ if (dev) {
1080+ DBG(dev->cdev, "adb_function_enable(%s)\n",
1081+ enable ? "true" : "false");
1082+
1083+ if (enable) {
1084+ dev->function.descriptors = fs_adb_descs;
1085+ dev->function.hs_descriptors = hs_adb_descs;
1086+ } else {
1087+ dev->function.descriptors = null_adb_descs;
1088+ dev->function.hs_descriptors = null_adb_descs;
1089+ }
1090+ }
1091+}
1092+
1093--- /dev/null
1094+++ b/drivers/usb/gadget/f_adb.h
1095@@ -0,0 +1,25 @@
1096+/*
1097+ * Gadget Driver for Android ADB
1098+ *
1099+ * Copyright (C) 2008 Google, Inc.
1100+ * Author: Mike Lockwood <lockwood@android.com>
1101+ *
1102+ * This software is licensed under the terms of the GNU General Public
1103+ * License version 2, as published by the Free Software Foundation, and
1104+ * may be copied, distributed, and modified under those terms.
1105+ *
1106+ * This program is distributed in the hope that it will be useful,
1107+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
1108+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1109+ * GNU General Public License for more details.
1110+ *
1111+ */
1112+
1113+#ifndef __F_ADB_H
1114+#define __F_ADB_H
1115+
1116+int adb_function_add(struct usb_composite_dev *cdev,
1117+ struct usb_configuration *c);
1118+void adb_function_enable(int enable);
1119+
1120+#endif /* __F_ADB_H */
1121--- /dev/null
1122+++ b/drivers/usb/gadget/f_mass_storage.c
1123@@ -0,0 +1,2906 @@
1124+/*
1125+ * drivers/usb/gadget/f_mass_storage.c
1126+ *
1127+ * Function Driver for USB Mass Storage
1128+ *
1129+ * Copyright (C) 2008 Google, Inc.
1130+ * Author: Mike Lockwood <lockwood@android.com>
1131+ *
1132+ * Based heavily on the file_storage gadget driver in
1133+ * drivers/usb/gadget/file_storage.c and licensed under the same terms:
1134+ *
1135+ * Copyright (C) 2003-2007 Alan Stern
1136+ * All rights reserved.
1137+ *
1138+ * Redistribution and use in source and binary forms, with or without
1139+ * modification, are permitted provided that the following conditions
1140+ * are met:
1141+ * 1. Redistributions of source code must retain the above copyright
1142+ * notice, this list of conditions, and the following disclaimer,
1143+ * without modification.
1144+ * 2. Redistributions in binary form must reproduce the above copyright
1145+ * notice, this list of conditions and the following disclaimer in the
1146+ * documentation and/or other materials provided with the distribution.
1147+ * 3. The names of the above-listed copyright holders may not be used
1148+ * to endorse or promote products derived from this software without
1149+ * specific prior written permission.
1150+ *
1151+ * ALTERNATIVELY, this software may be distributed under the terms of the
1152+ * GNU General Public License ("GPL") as published by the Free Software
1153+ * Foundation, either version 2 of that License or (at your option) any
1154+ * later version.
1155+ *
1156+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
1157+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
1158+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
1159+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
1160+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
1161+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
1162+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
1163+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
1164+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
1165+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
1166+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1167+ */
1168+
1169+/* #define DEBUG */
1170+/* #define VERBOSE_DEBUG */
1171+/* #define DUMP_MSGS */
1172+
1173+
1174+#include <linux/blkdev.h>
1175+#include <linux/completion.h>
1176+#include <linux/dcache.h>
1177+#include <linux/delay.h>
1178+#include <linux/device.h>
1179+#include <linux/fcntl.h>
1180+#include <linux/file.h>
1181+#include <linux/fs.h>
1182+#include <linux/kref.h>
1183+#include <linux/kthread.h>
1184+#include <linux/limits.h>
1185+#include <linux/rwsem.h>
1186+#include <linux/slab.h>
1187+#include <linux/spinlock.h>
1188+#include <linux/string.h>
1189+#include <linux/switch.h>
1190+#include <linux/freezer.h>
1191+#include <linux/utsname.h>
1192+#include <linux/wakelock.h>
1193+
1194+#include <linux/usb_usual.h>
1195+#include <linux/usb/ch9.h>
1196+#include <linux/usb/composite.h>
1197+#include <linux/usb/gadget.h>
1198+
1199+#include "f_mass_storage.h"
1200+#include "gadget_chips.h"
1201+
1202+
1203+#define BULK_BUFFER_SIZE 4096
1204+
1205+/*-------------------------------------------------------------------------*/
1206+
1207+#define DRIVER_NAME "usb_mass_storage"
1208+#define MAX_LUNS 8
1209+
1210+static const char shortname[] = DRIVER_NAME;
1211+
1212+#ifdef DEBUG
1213+#define LDBG(lun, fmt, args...) \
1214+ dev_dbg(&(lun)->dev , fmt , ## args)
1215+#define MDBG(fmt,args...) \
1216+ printk(KERN_DEBUG DRIVER_NAME ": " fmt , ## args)
1217+#else
1218+#define LDBG(lun, fmt, args...) \
1219+ do { } while (0)
1220+#define MDBG(fmt,args...) \
1221+ do { } while (0)
1222+#undef VERBOSE_DEBUG
1223+#undef DUMP_MSGS
1224+#endif /* DEBUG */
1225+
1226+#ifdef VERBOSE_DEBUG
1227+#define VLDBG LDBG
1228+#else
1229+#define VLDBG(lun, fmt, args...) \
1230+ do { } while (0)
1231+#endif /* VERBOSE_DEBUG */
1232+
1233+#define LERROR(lun, fmt, args...) \
1234+ dev_err(&(lun)->dev , fmt , ## args)
1235+#define LWARN(lun, fmt, args...) \
1236+ dev_warn(&(lun)->dev , fmt , ## args)
1237+#define LINFO(lun, fmt, args...) \
1238+ dev_info(&(lun)->dev , fmt , ## args)
1239+
1240+#define MINFO(fmt,args...) \
1241+ printk(KERN_INFO DRIVER_NAME ": " fmt , ## args)
1242+
1243+#undef DBG
1244+#undef VDBG
1245+#undef ERROR
1246+#undef WARNING
1247+#undef INFO
1248+#define DBG(d, fmt, args...) \
1249+ dev_dbg(&(d)->cdev->gadget->dev , fmt , ## args)
1250+#define VDBG(d, fmt, args...) \
1251+ dev_vdbg(&(d)->cdev->gadget->dev , fmt , ## args)
1252+#define ERROR(d, fmt, args...) \
1253+ dev_err(&(d)->cdev->gadget->dev , fmt , ## args)
1254+#define WARNING(d, fmt, args...) \
1255+ dev_warn(&(d)->cdev->gadget->dev , fmt , ## args)
1256+#define INFO(d, fmt, args...) \
1257+ dev_info(&(d)->cdev->gadget->dev , fmt , ## args)
1258+
1259+
1260+/*-------------------------------------------------------------------------*/
1261+
1262+/* Bulk-only data structures */
1263+
1264+/* Command Block Wrapper */
1265+struct bulk_cb_wrap {
1266+ __le32 Signature; /* Contains 'USBC' */
1267+ u32 Tag; /* Unique per command id */
1268+ __le32 DataTransferLength; /* Size of the data */
1269+ u8 Flags; /* Direction in bit 7 */
1270+ u8 Lun; /* LUN (normally 0) */
1271+ u8 Length; /* Of the CDB, <= MAX_COMMAND_SIZE */
1272+ u8 CDB[16]; /* Command Data Block */
1273+};
1274+
1275+#define USB_BULK_CB_WRAP_LEN 31
1276+#define USB_BULK_CB_SIG 0x43425355 /* Spells out USBC */
1277+#define USB_BULK_IN_FLAG 0x80
1278+
1279+/* Command Status Wrapper */
1280+struct bulk_cs_wrap {
1281+ __le32 Signature; /* Should = 'USBS' */
1282+ u32 Tag; /* Same as original command */
1283+ __le32 Residue; /* Amount not transferred */
1284+ u8 Status; /* See below */
1285+};
1286+
1287+#define USB_BULK_CS_WRAP_LEN 13
1288+#define USB_BULK_CS_SIG 0x53425355 /* Spells out 'USBS' */
1289+#define USB_STATUS_PASS 0
1290+#define USB_STATUS_FAIL 1
1291+#define USB_STATUS_PHASE_ERROR 2
1292+
1293+/* Bulk-only class specific requests */
1294+#define USB_BULK_RESET_REQUEST 0xff
1295+#define USB_BULK_GET_MAX_LUN_REQUEST 0xfe
1296+
1297+/* Length of a SCSI Command Data Block */
1298+#define MAX_COMMAND_SIZE 16
1299+
1300+/* SCSI commands that we recognize */
1301+#define SC_FORMAT_UNIT 0x04
1302+#define SC_INQUIRY 0x12
1303+#define SC_MODE_SELECT_6 0x15
1304+#define SC_MODE_SELECT_10 0x55
1305+#define SC_MODE_SENSE_6 0x1a
1306+#define SC_MODE_SENSE_10 0x5a
1307+#define SC_PREVENT_ALLOW_MEDIUM_REMOVAL 0x1e
1308+#define SC_READ_6 0x08
1309+#define SC_READ_10 0x28
1310+#define SC_READ_12 0xa8
1311+#define SC_READ_CAPACITY 0x25
1312+#define SC_READ_FORMAT_CAPACITIES 0x23
1313+#define SC_RELEASE 0x17
1314+#define SC_REQUEST_SENSE 0x03
1315+#define SC_RESERVE 0x16
1316+#define SC_SEND_DIAGNOSTIC 0x1d
1317+#define SC_START_STOP_UNIT 0x1b
1318+#define SC_SYNCHRONIZE_CACHE 0x35
1319+#define SC_TEST_UNIT_READY 0x00
1320+#define SC_VERIFY 0x2f
1321+#define SC_WRITE_6 0x0a
1322+#define SC_WRITE_10 0x2a
1323+#define SC_WRITE_12 0xaa
1324+
1325+/* SCSI Sense Key/Additional Sense Code/ASC Qualifier values */
1326+#define SS_NO_SENSE 0
1327+#define SS_COMMUNICATION_FAILURE 0x040800
1328+#define SS_INVALID_COMMAND 0x052000
1329+#define SS_INVALID_FIELD_IN_CDB 0x052400
1330+#define SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE 0x052100
1331+#define SS_LOGICAL_UNIT_NOT_SUPPORTED 0x052500
1332+#define SS_MEDIUM_NOT_PRESENT 0x023a00
1333+#define SS_MEDIUM_REMOVAL_PREVENTED 0x055302
1334+#define SS_NOT_READY_TO_READY_TRANSITION 0x062800
1335+#define SS_RESET_OCCURRED 0x062900
1336+#define SS_SAVING_PARAMETERS_NOT_SUPPORTED 0x053900
1337+#define SS_UNRECOVERED_READ_ERROR 0x031100
1338+#define SS_WRITE_ERROR 0x030c02
1339+#define SS_WRITE_PROTECTED 0x072700
1340+
1341+#define SK(x) ((u8) ((x) >> 16)) /* Sense Key byte, etc. */
1342+#define ASC(x) ((u8) ((x) >> 8))
1343+#define ASCQ(x) ((u8) (x))
1344+
1345+
1346+/*-------------------------------------------------------------------------*/
1347+
1348+struct lun {
1349+ struct file *filp;
1350+ loff_t file_length;
1351+ loff_t num_sectors;
1352+
1353+ unsigned int ro : 1;
1354+ unsigned int prevent_medium_removal : 1;
1355+ unsigned int registered : 1;
1356+ unsigned int info_valid : 1;
1357+
1358+ u32 sense_data;
1359+ u32 sense_data_info;
1360+ u32 unit_attention_data;
1361+
1362+ struct device dev;
1363+};
1364+
1365+#define backing_file_is_open(curlun) ((curlun)->filp != NULL)
1366+
1367+
1368+static struct lun *dev_to_lun(struct device *dev)
1369+{
1370+ return container_of(dev, struct lun, dev);
1371+}
1372+
1373+/* Big enough to hold our biggest descriptor */
1374+#define EP0_BUFSIZE 256
1375+#define DELAYED_STATUS (EP0_BUFSIZE + 999) /* An impossibly large value */
1376+
1377+/* Number of buffers we will use. 2 is enough for double-buffering */
1378+#define NUM_BUFFERS 2
1379+
1380+enum fsg_buffer_state {
1381+ BUF_STATE_EMPTY = 0,
1382+ BUF_STATE_FULL,
1383+ BUF_STATE_BUSY
1384+};
1385+
1386+struct fsg_buffhd {
1387+ void *buf;
1388+ enum fsg_buffer_state state;
1389+ struct fsg_buffhd *next;
1390+
1391+ /* The NetChip 2280 is faster, and handles some protocol faults
1392+ * better, if we don't submit any short bulk-out read requests.
1393+ * So we will record the intended request length here. */
1394+ unsigned int bulk_out_intended_length;
1395+
1396+ struct usb_request *inreq;
1397+ int inreq_busy;
1398+ struct usb_request *outreq;
1399+ int outreq_busy;
1400+};
1401+
1402+enum fsg_state {
1403+ /* This one isn't used anywhere */
1404+ FSG_STATE_COMMAND_PHASE = -10,
1405+
1406+ FSG_STATE_DATA_PHASE,
1407+ FSG_STATE_STATUS_PHASE,
1408+
1409+ FSG_STATE_IDLE = 0,
1410+ FSG_STATE_ABORT_BULK_OUT,
1411+ FSG_STATE_RESET,
1412+ FSG_STATE_CONFIG_CHANGE,
1413+ FSG_STATE_EXIT,
1414+ FSG_STATE_TERMINATED
1415+};
1416+
1417+enum data_direction {
1418+ DATA_DIR_UNKNOWN = 0,
1419+ DATA_DIR_FROM_HOST,
1420+ DATA_DIR_TO_HOST,
1421+ DATA_DIR_NONE
1422+};
1423+
1424+struct fsg_dev {
1425+ struct usb_function function;
1426+ struct usb_composite_dev *cdev;
1427+
1428+ /* lock protects: state and all the req_busy's */
1429+ spinlock_t lock;
1430+
1431+ /* filesem protects: backing files in use */
1432+ struct rw_semaphore filesem;
1433+
1434+ /* reference counting: wait until all LUNs are released */
1435+ struct kref ref;
1436+
1437+ unsigned int bulk_out_maxpacket;
1438+ enum fsg_state state; /* For exception handling */
1439+
1440+ u8 config, new_config;
1441+
1442+ unsigned int running : 1;
1443+ unsigned int bulk_in_enabled : 1;
1444+ unsigned int bulk_out_enabled : 1;
1445+ unsigned int phase_error : 1;
1446+ unsigned int short_packet_received : 1;
1447+ unsigned int bad_lun_okay : 1;
1448+
1449+ unsigned long atomic_bitflags;
1450+#define REGISTERED 0
1451+#define CLEAR_BULK_HALTS 1
1452+#define SUSPENDED 2
1453+
1454+ struct usb_ep *bulk_in;
1455+ struct usb_ep *bulk_out;
1456+
1457+ struct fsg_buffhd *next_buffhd_to_fill;
1458+ struct fsg_buffhd *next_buffhd_to_drain;
1459+ struct fsg_buffhd buffhds[NUM_BUFFERS];
1460+
1461+ int thread_wakeup_needed;
1462+ struct completion thread_notifier;
1463+ struct task_struct *thread_task;
1464+
1465+ int cmnd_size;
1466+ u8 cmnd[MAX_COMMAND_SIZE];
1467+ enum data_direction data_dir;
1468+ u32 data_size;
1469+ u32 data_size_from_cmnd;
1470+ u32 tag;
1471+ unsigned int lun;
1472+ u32 residue;
1473+ u32 usb_amount_left;
1474+
1475+ unsigned int nluns;
1476+ struct lun *luns;
1477+ struct lun *curlun;
1478+
1479+ u32 buf_size;
1480+ const char *vendor;
1481+ const char *product;
1482+ int release;
1483+
1484+ struct switch_dev sdev;
1485+
1486+ struct wake_lock wake_lock;
1487+};
1488+
1489+static inline struct fsg_dev *func_to_dev(struct usb_function *f)
1490+{
1491+ return container_of(f, struct fsg_dev, function);
1492+}
1493+
1494+static int exception_in_progress(struct fsg_dev *fsg)
1495+{
1496+ return (fsg->state > FSG_STATE_IDLE);
1497+}
1498+
1499+/* Make bulk-out requests be divisible by the maxpacket size */
1500+static void set_bulk_out_req_length(struct fsg_dev *fsg,
1501+ struct fsg_buffhd *bh, unsigned int length)
1502+{
1503+ unsigned int rem;
1504+
1505+ bh->bulk_out_intended_length = length;
1506+ rem = length % fsg->bulk_out_maxpacket;
1507+ if (rem > 0)
1508+ length += fsg->bulk_out_maxpacket - rem;
1509+ bh->outreq->length = length;
1510+}
1511+
1512+static struct fsg_dev *the_fsg;
1513+
1514+static void close_backing_file(struct fsg_dev *fsg, struct lun *curlun);
1515+static void close_all_backing_files(struct fsg_dev *fsg);
1516+
1517+
1518+/*-------------------------------------------------------------------------*/
1519+
1520+#ifdef DUMP_MSGS
1521+
1522+static void dump_msg(struct fsg_dev *fsg, const char *label,
1523+ const u8 *buf, unsigned int length)
1524+{
1525+ if (length < 512) {
1526+ DBG(fsg, "%s, length %u:\n", label, length);
1527+ print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET,
1528+ 16, 1, buf, length, 0);
1529+ }
1530+}
1531+
1532+static void dump_cdb(struct fsg_dev *fsg)
1533+{}
1534+
1535+#else
1536+
1537+static void dump_msg(struct fsg_dev *fsg, const char *label,
1538+ const u8 *buf, unsigned int length)
1539+{}
1540+
1541+#ifdef VERBOSE_DEBUG
1542+
1543+static void dump_cdb(struct fsg_dev *fsg)
1544+{
1545+ print_hex_dump(KERN_DEBUG, "SCSI CDB: ", DUMP_PREFIX_NONE,
1546+ 16, 1, fsg->cmnd, fsg->cmnd_size, 0);
1547+}
1548+
1549+#else
1550+
1551+static void dump_cdb(struct fsg_dev *fsg)
1552+{}
1553+
1554+#endif /* VERBOSE_DEBUG */
1555+#endif /* DUMP_MSGS */
1556+
1557+
1558+/*-------------------------------------------------------------------------*/
1559+
1560+/* Routines for unaligned data access */
1561+
1562+static u16 get_be16(u8 *buf)
1563+{
1564+ return ((u16) buf[0] << 8) | ((u16) buf[1]);
1565+}
1566+
1567+static u32 get_be32(u8 *buf)
1568+{
1569+ return ((u32) buf[0] << 24) | ((u32) buf[1] << 16) |
1570+ ((u32) buf[2] << 8) | ((u32) buf[3]);
1571+}
1572+
1573+static void put_be16(u8 *buf, u16 val)
1574+{
1575+ buf[0] = val >> 8;
1576+ buf[1] = val;
1577+}
1578+
1579+static void put_be32(u8 *buf, u32 val)
1580+{
1581+ buf[0] = val >> 24;
1582+ buf[1] = val >> 16;
1583+ buf[2] = val >> 8;
1584+ buf[3] = val & 0xff;
1585+}
1586+
1587+/*-------------------------------------------------------------------------*/
1588+
1589+/*
1590+ * DESCRIPTORS ... most are static, but strings and (full) configuration
1591+ * descriptors are built on demand. Also the (static) config and interface
1592+ * descriptors are adjusted during fsg_bind().
1593+ */
1594+
1595+/* There is only one interface. */
1596+
1597+static struct usb_interface_descriptor
1598+intf_desc = {
1599+ .bLength = sizeof intf_desc,
1600+ .bDescriptorType = USB_DT_INTERFACE,
1601+
1602+ .bNumEndpoints = 2, /* Adjusted during fsg_bind() */
1603+ .bInterfaceClass = USB_CLASS_MASS_STORAGE,
1604+ .bInterfaceSubClass = US_SC_SCSI,
1605+ .bInterfaceProtocol = US_PR_BULK,
1606+};
1607+
1608+/* Three full-speed endpoint descriptors: bulk-in, bulk-out,
1609+ * and interrupt-in. */
1610+
1611+static struct usb_endpoint_descriptor
1612+fs_bulk_in_desc = {
1613+ .bLength = USB_DT_ENDPOINT_SIZE,
1614+ .bDescriptorType = USB_DT_ENDPOINT,
1615+
1616+ .bEndpointAddress = USB_DIR_IN,
1617+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
1618+ /* wMaxPacketSize set by autoconfiguration */
1619+};
1620+
1621+static struct usb_endpoint_descriptor
1622+fs_bulk_out_desc = {
1623+ .bLength = USB_DT_ENDPOINT_SIZE,
1624+ .bDescriptorType = USB_DT_ENDPOINT,
1625+
1626+ .bEndpointAddress = USB_DIR_OUT,
1627+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
1628+ /* wMaxPacketSize set by autoconfiguration */
1629+};
1630+
1631+static struct usb_descriptor_header *fs_function[] = {
1632+ (struct usb_descriptor_header *) &intf_desc,
1633+ (struct usb_descriptor_header *) &fs_bulk_in_desc,
1634+ (struct usb_descriptor_header *) &fs_bulk_out_desc,
1635+ NULL,
1636+};
1637+#define FS_FUNCTION_PRE_EP_ENTRIES 2
1638+
1639+
1640+static struct usb_endpoint_descriptor
1641+hs_bulk_in_desc = {
1642+ .bLength = USB_DT_ENDPOINT_SIZE,
1643+ .bDescriptorType = USB_DT_ENDPOINT,
1644+
1645+ /* bEndpointAddress copied from fs_bulk_in_desc during fsg_bind() */
1646+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
1647+ .wMaxPacketSize = __constant_cpu_to_le16(512),
1648+};
1649+
1650+static struct usb_endpoint_descriptor
1651+hs_bulk_out_desc = {
1652+ .bLength = USB_DT_ENDPOINT_SIZE,
1653+ .bDescriptorType = USB_DT_ENDPOINT,
1654+
1655+ /* bEndpointAddress copied from fs_bulk_out_desc during fsg_bind() */
1656+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
1657+ .wMaxPacketSize = __constant_cpu_to_le16(512),
1658+ .bInterval = 1, /* NAK every 1 uframe */
1659+};
1660+
1661+
1662+static struct usb_descriptor_header *hs_function[] = {
1663+ (struct usb_descriptor_header *) &intf_desc,
1664+ (struct usb_descriptor_header *) &hs_bulk_in_desc,
1665+ (struct usb_descriptor_header *) &hs_bulk_out_desc,
1666+ NULL,
1667+};
1668+
1669+/* Maxpacket and other transfer characteristics vary by speed. */
1670+static struct usb_endpoint_descriptor *
1671+ep_desc(struct usb_gadget *g, struct usb_endpoint_descriptor *fs,
1672+ struct usb_endpoint_descriptor *hs)
1673+{
1674+ if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH)
1675+ return hs;
1676+ return fs;
1677+}
1678+
1679+/*-------------------------------------------------------------------------*/
1680+
1681+/* These routines may be called in process context or in_irq */
1682+
1683+/* Caller must hold fsg->lock */
1684+static void wakeup_thread(struct fsg_dev *fsg)
1685+{
1686+ /* Tell the main thread that something has happened */
1687+ fsg->thread_wakeup_needed = 1;
1688+ if (fsg->thread_task)
1689+ wake_up_process(fsg->thread_task);
1690+}
1691+
1692+
1693+static void raise_exception(struct fsg_dev *fsg, enum fsg_state new_state)
1694+{
1695+ unsigned long flags;
1696+
1697+ DBG(fsg, "raise_exception %d\n", (int)new_state);
1698+ /* Do nothing if a higher-priority exception is already in progress.
1699+ * If a lower-or-equal priority exception is in progress, preempt it
1700+ * and notify the main thread by sending it a signal. */
1701+ spin_lock_irqsave(&fsg->lock, flags);
1702+ if (fsg->state <= new_state) {
1703+ fsg->state = new_state;
1704+ if (fsg->thread_task)
1705+ send_sig_info(SIGUSR1, SEND_SIG_FORCED,
1706+ fsg->thread_task);
1707+ }
1708+ spin_unlock_irqrestore(&fsg->lock, flags);
1709+}
1710+
1711+
1712+/*-------------------------------------------------------------------------*/
1713+
1714+/* Bulk and interrupt endpoint completion handlers.
1715+ * These always run in_irq. */
1716+
1717+static void bulk_in_complete(struct usb_ep *ep, struct usb_request *req)
1718+{
1719+ struct fsg_dev *fsg = ep->driver_data;
1720+ struct fsg_buffhd *bh = req->context;
1721+
1722+ if (req->status || req->actual != req->length)
1723+ DBG(fsg, "%s --> %d, %u/%u\n", __func__,
1724+ req->status, req->actual, req->length);
1725+
1726+ /* Hold the lock while we update the request and buffer states */
1727+ smp_wmb();
1728+ spin_lock(&fsg->lock);
1729+ bh->inreq_busy = 0;
1730+ bh->state = BUF_STATE_EMPTY;
1731+ wakeup_thread(fsg);
1732+ spin_unlock(&fsg->lock);
1733+}
1734+
1735+static void bulk_out_complete(struct usb_ep *ep, struct usb_request *req)
1736+{
1737+ struct fsg_dev *fsg = ep->driver_data;
1738+ struct fsg_buffhd *bh = req->context;
1739+
1740+ dump_msg(fsg, "bulk-out", req->buf, req->actual);
1741+ if (req->status || req->actual != bh->bulk_out_intended_length)
1742+ DBG(fsg, "%s --> %d, %u/%u\n", __func__,
1743+ req->status, req->actual,
1744+ bh->bulk_out_intended_length);
1745+
1746+ /* Hold the lock while we update the request and buffer states */
1747+ smp_wmb();
1748+ spin_lock(&fsg->lock);
1749+ bh->outreq_busy = 0;
1750+ bh->state = BUF_STATE_FULL;
1751+ wakeup_thread(fsg);
1752+ spin_unlock(&fsg->lock);
1753+}
1754+
1755+static int fsg_function_setup(struct usb_function *f,
1756+ const struct usb_ctrlrequest *ctrl)
1757+{
1758+ struct fsg_dev *fsg = func_to_dev(f);
1759+ struct usb_composite_dev *cdev = fsg->cdev;
1760+ int value = -EOPNOTSUPP;
1761+ u16 w_index = le16_to_cpu(ctrl->wIndex);
1762+ u16 w_value = le16_to_cpu(ctrl->wValue);
1763+ u16 w_length = le16_to_cpu(ctrl->wLength);
1764+
1765+ DBG(fsg, "fsg_function_setup\n");
1766+ /* Handle Bulk-only class-specific requests */
1767+ if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_CLASS) {
1768+ DBG(fsg, "USB_TYPE_CLASS\n");
1769+ switch (ctrl->bRequest) {
1770+ case USB_BULK_RESET_REQUEST:
1771+ if (ctrl->bRequestType != (USB_DIR_OUT |
1772+ USB_TYPE_CLASS | USB_RECIP_INTERFACE))
1773+ break;
1774+ if (w_index != 0 || w_value != 0) {
1775+ value = -EDOM;
1776+ break;
1777+ }
1778+
1779+ /* Raise an exception to stop the current operation
1780+ * and reinitialize our state. */
1781+ DBG(fsg, "bulk reset request\n");
1782+ raise_exception(fsg, FSG_STATE_RESET);
1783+ value = DELAYED_STATUS;
1784+ break;
1785+
1786+ case USB_BULK_GET_MAX_LUN_REQUEST:
1787+ if (ctrl->bRequestType != (USB_DIR_IN |
1788+ USB_TYPE_CLASS | USB_RECIP_INTERFACE))
1789+ break;
1790+ if (w_index != 0 || w_value != 0) {
1791+ value = -EDOM;
1792+ break;
1793+ }
1794+ VDBG(fsg, "get max LUN\n");
1795+ *(u8 *)cdev->req->buf = fsg->nluns - 1;
1796+ value = 1;
1797+ break;
1798+ }
1799+ }
1800+
1801+ if (value == -EOPNOTSUPP)
1802+ VDBG(fsg,
1803+ "unknown class-specific control req "
1804+ "%02x.%02x v%04x i%04x l%u\n",
1805+ ctrl->bRequestType, ctrl->bRequest,
1806+ le16_to_cpu(ctrl->wValue), w_index, w_length);
1807+ return value;
1808+}
1809+
1810+/*-------------------------------------------------------------------------*/
1811+
1812+/* All the following routines run in process context */
1813+
1814+
1815+/* Use this for bulk or interrupt transfers, not ep0 */
1816+static void start_transfer(struct fsg_dev *fsg, struct usb_ep *ep,
1817+ struct usb_request *req, int *pbusy,
1818+ enum fsg_buffer_state *state)
1819+{
1820+ int rc;
1821+
1822+ DBG(fsg, "start_transfer req: %p, req->buf: %p\n", req, req->buf);
1823+ if (ep == fsg->bulk_in)
1824+ dump_msg(fsg, "bulk-in", req->buf, req->length);
1825+
1826+ spin_lock_irq(&fsg->lock);
1827+ *pbusy = 1;
1828+ *state = BUF_STATE_BUSY;
1829+ spin_unlock_irq(&fsg->lock);
1830+ rc = usb_ep_queue(ep, req, GFP_KERNEL);
1831+ if (rc != 0) {
1832+ *pbusy = 0;
1833+ *state = BUF_STATE_EMPTY;
1834+
1835+ /* We can't do much more than wait for a reset */
1836+
1837+ /* Note: currently the net2280 driver fails zero-length
1838+ * submissions if DMA is enabled. */
1839+ if (rc != -ESHUTDOWN && !(rc == -EOPNOTSUPP &&
1840+ req->length == 0))
1841+ WARN(fsg, "error in submission: %s --> %d\n",
1842+ (ep == fsg->bulk_in ? "bulk-in" : "bulk-out"),
1843+ rc);
1844+ }
1845+}
1846+
1847+
1848+static int sleep_thread(struct fsg_dev *fsg)
1849+{
1850+ int rc = 0;
1851+
1852+ /* Wait until a signal arrives or we are woken up */
1853+ for (;;) {
1854+ try_to_freeze();
1855+ set_current_state(TASK_INTERRUPTIBLE);
1856+ if (signal_pending(current)) {
1857+ rc = -EINTR;
1858+ break;
1859+ }
1860+ if (fsg->thread_wakeup_needed)
1861+ break;
1862+ schedule();
1863+ }
1864+ __set_current_state(TASK_RUNNING);
1865+ fsg->thread_wakeup_needed = 0;
1866+ return rc;
1867+}
1868+
1869+
1870+/*-------------------------------------------------------------------------*/
1871+
1872+static int do_read(struct fsg_dev *fsg)
1873+{
1874+ struct lun *curlun = fsg->curlun;
1875+ u32 lba;
1876+ struct fsg_buffhd *bh;
1877+ int rc;
1878+ u32 amount_left;
1879+ loff_t file_offset, file_offset_tmp;
1880+ unsigned int amount;
1881+ unsigned int partial_page;
1882+ ssize_t nread;
1883+
1884+ /* Get the starting Logical Block Address and check that it's
1885+ * not too big */
1886+ if (fsg->cmnd[0] == SC_READ_6)
1887+ lba = (fsg->cmnd[1] << 16) | get_be16(&fsg->cmnd[2]);
1888+ else {
1889+ lba = get_be32(&fsg->cmnd[2]);
1890+
1891+ /* We allow DPO (Disable Page Out = don't save data in the
1892+ * cache) and FUA (Force Unit Access = don't read from the
1893+ * cache), but we don't implement them. */
1894+ if ((fsg->cmnd[1] & ~0x18) != 0) {
1895+ curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
1896+ return -EINVAL;
1897+ }
1898+ }
1899+ if (lba >= curlun->num_sectors) {
1900+ curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
1901+ return -EINVAL;
1902+ }
1903+ file_offset = ((loff_t) lba) << 9;
1904+
1905+ /* Carry out the file reads */
1906+ amount_left = fsg->data_size_from_cmnd;
1907+ if (unlikely(amount_left == 0))
1908+ return -EIO; /* No default reply */
1909+
1910+ for (;;) {
1911+
1912+ /* Figure out how much we need to read:
1913+ * Try to read the remaining amount.
1914+ * But don't read more than the buffer size.
1915+ * And don't try to read past the end of the file.
1916+ * Finally, if we're not at a page boundary, don't read past
1917+ * the next page.
1918+ * If this means reading 0 then we were asked to read past
1919+ * the end of file. */
1920+ amount = min((unsigned int) amount_left,
1921+ (unsigned int)fsg->buf_size);
1922+ amount = min((loff_t) amount,
1923+ curlun->file_length - file_offset);
1924+ partial_page = file_offset & (PAGE_CACHE_SIZE - 1);
1925+ if (partial_page > 0)
1926+ amount = min(amount, (unsigned int) PAGE_CACHE_SIZE -
1927+ partial_page);
1928+
1929+ /* Wait for the next buffer to become available */
1930+ bh = fsg->next_buffhd_to_fill;
1931+ while (bh->state != BUF_STATE_EMPTY) {
1932+ rc = sleep_thread(fsg);
1933+ if (rc)
1934+ return rc;
1935+ }
1936+
1937+ /* If we were asked to read past the end of file,
1938+ * end with an empty buffer. */
1939+ if (amount == 0) {
1940+ curlun->sense_data =
1941+ SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
1942+ curlun->sense_data_info = file_offset >> 9;
1943+ curlun->info_valid = 1;
1944+ bh->inreq->length = 0;
1945+ bh->state = BUF_STATE_FULL;
1946+ break;
1947+ }
1948+
1949+ /* Perform the read */
1950+ file_offset_tmp = file_offset;
1951+ nread = vfs_read(curlun->filp,
1952+ (char __user *) bh->buf,
1953+ amount, &file_offset_tmp);
1954+ VLDBG(curlun, "file read %u @ %llu -> %d\n", amount,
1955+ (unsigned long long) file_offset,
1956+ (int) nread);
1957+ if (signal_pending(current))
1958+ return -EINTR;
1959+
1960+ if (nread < 0) {
1961+ LDBG(curlun, "error in file read: %d\n",
1962+ (int) nread);
1963+ nread = 0;
1964+ } else if (nread < amount) {
1965+ LDBG(curlun, "partial file read: %d/%u\n",
1966+ (int) nread, amount);
1967+ nread -= (nread & 511); /* Round down to a block */
1968+ }
1969+ file_offset += nread;
1970+ amount_left -= nread;
1971+ fsg->residue -= nread;
1972+ bh->inreq->length = nread;
1973+ bh->state = BUF_STATE_FULL;
1974+
1975+ /* If an error occurred, report it and its position */
1976+ if (nread < amount) {
1977+ curlun->sense_data = SS_UNRECOVERED_READ_ERROR;
1978+ curlun->sense_data_info = file_offset >> 9;
1979+ curlun->info_valid = 1;
1980+ break;
1981+ }
1982+
1983+ if (amount_left == 0)
1984+ break; /* No more left to read */
1985+
1986+ /* Send this buffer and go read some more */
1987+ start_transfer(fsg, fsg->bulk_in, bh->inreq,
1988+ &bh->inreq_busy, &bh->state);
1989+ fsg->next_buffhd_to_fill = bh->next;
1990+ }
1991+
1992+ return -EIO; /* No default reply */
1993+}
1994+
1995+
1996+/*-------------------------------------------------------------------------*/
1997+
1998+static int do_write(struct fsg_dev *fsg)
1999+{
2000+ struct lun *curlun = fsg->curlun;
2001+ u32 lba;
2002+ struct fsg_buffhd *bh;
2003+ int get_some_more;
2004+ u32 amount_left_to_req, amount_left_to_write;
2005+ loff_t usb_offset, file_offset, file_offset_tmp;
2006+ unsigned int amount;
2007+ unsigned int partial_page;
2008+ ssize_t nwritten;
2009+ int rc;
2010+
2011+ if (curlun->ro) {
2012+ curlun->sense_data = SS_WRITE_PROTECTED;
2013+ return -EINVAL;
2014+ }
2015+ curlun->filp->f_flags &= ~O_SYNC; /* Default is not to wait */
2016+
2017+ /* Get the starting Logical Block Address and check that it's
2018+ * not too big */
2019+ if (fsg->cmnd[0] == SC_WRITE_6)
2020+ lba = (fsg->cmnd[1] << 16) | get_be16(&fsg->cmnd[2]);
2021+ else {
2022+ lba = get_be32(&fsg->cmnd[2]);
2023+
2024+ /* We allow DPO (Disable Page Out = don't save data in the
2025+ * cache) and FUA (Force Unit Access = write directly to the
2026+ * medium). We don't implement DPO; we implement FUA by
2027+ * performing synchronous output. */
2028+ if ((fsg->cmnd[1] & ~0x18) != 0) {
2029+ curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
2030+ return -EINVAL;
2031+ }
2032+ if (fsg->cmnd[1] & 0x08) /* FUA */
2033+ curlun->filp->f_flags |= O_SYNC;
2034+ }
2035+ if (lba >= curlun->num_sectors) {
2036+ curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
2037+ return -EINVAL;
2038+ }
2039+
2040+ /* Carry out the file writes */
2041+ get_some_more = 1;
2042+ file_offset = usb_offset = ((loff_t) lba) << 9;
2043+ amount_left_to_req = amount_left_to_write = fsg->data_size_from_cmnd;
2044+
2045+ while (amount_left_to_write > 0) {
2046+
2047+ /* Queue a request for more data from the host */
2048+ bh = fsg->next_buffhd_to_fill;
2049+ if (bh->state == BUF_STATE_EMPTY && get_some_more) {
2050+
2051+ /* Figure out how much we want to get:
2052+ * Try to get the remaining amount.
2053+ * But don't get more than the buffer size.
2054+ * And don't try to go past the end of the file.
2055+ * If we're not at a page boundary,
2056+ * don't go past the next page.
2057+ * If this means getting 0, then we were asked
2058+ * to write past the end of file.
2059+ * Finally, round down to a block boundary. */
2060+ amount = min(amount_left_to_req, (u32)fsg->buf_size);
2061+ amount = min((loff_t) amount, curlun->file_length -
2062+ usb_offset);
2063+ partial_page = usb_offset & (PAGE_CACHE_SIZE - 1);
2064+ if (partial_page > 0)
2065+ amount = min(amount,
2066+ (unsigned int) PAGE_CACHE_SIZE - partial_page);
2067+
2068+ if (amount == 0) {
2069+ get_some_more = 0;
2070+ curlun->sense_data =
2071+ SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
2072+ curlun->sense_data_info = usb_offset >> 9;
2073+ curlun->info_valid = 1;
2074+ continue;
2075+ }
2076+ amount -= (amount & 511);
2077+ if (amount == 0) {
2078+
2079+ /* Why were we were asked to transfer a
2080+ * partial block? */
2081+ get_some_more = 0;
2082+ continue;
2083+ }
2084+
2085+ /* Get the next buffer */
2086+ usb_offset += amount;
2087+ fsg->usb_amount_left -= amount;
2088+ amount_left_to_req -= amount;
2089+ if (amount_left_to_req == 0)
2090+ get_some_more = 0;
2091+
2092+ /* amount is always divisible by 512, hence by
2093+ * the bulk-out maxpacket size */
2094+ bh->outreq->length = bh->bulk_out_intended_length =
2095+ amount;
2096+ start_transfer(fsg, fsg->bulk_out, bh->outreq,
2097+ &bh->outreq_busy, &bh->state);
2098+ fsg->next_buffhd_to_fill = bh->next;
2099+ continue;
2100+ }
2101+
2102+ /* Write the received data to the backing file */
2103+ bh = fsg->next_buffhd_to_drain;
2104+ if (bh->state == BUF_STATE_EMPTY && !get_some_more)
2105+ break; /* We stopped early */
2106+ if (bh->state == BUF_STATE_FULL) {
2107+ smp_rmb();
2108+ fsg->next_buffhd_to_drain = bh->next;
2109+ bh->state = BUF_STATE_EMPTY;
2110+
2111+ /* Did something go wrong with the transfer? */
2112+ if (bh->outreq->status != 0) {
2113+ curlun->sense_data = SS_COMMUNICATION_FAILURE;
2114+ curlun->sense_data_info = file_offset >> 9;
2115+ curlun->info_valid = 1;
2116+ break;
2117+ }
2118+
2119+ amount = bh->outreq->actual;
2120+ if (curlun->file_length - file_offset < amount) {
2121+ LERROR(curlun,
2122+ "write %u @ %llu beyond end %llu\n",
2123+ amount, (unsigned long long) file_offset,
2124+ (unsigned long long) curlun->file_length);
2125+ amount = curlun->file_length - file_offset;
2126+ }
2127+
2128+ /* Perform the write */
2129+ file_offset_tmp = file_offset;
2130+ nwritten = vfs_write(curlun->filp,
2131+ (char __user *) bh->buf,
2132+ amount, &file_offset_tmp);
2133+ VLDBG(curlun, "file write %u @ %llu -> %d\n", amount,
2134+ (unsigned long long) file_offset,
2135+ (int) nwritten);
2136+ if (signal_pending(current))
2137+ return -EINTR; /* Interrupted! */
2138+
2139+ if (nwritten < 0) {
2140+ LDBG(curlun, "error in file write: %d\n",
2141+ (int) nwritten);
2142+ nwritten = 0;
2143+ } else if (nwritten < amount) {
2144+ LDBG(curlun, "partial file write: %d/%u\n",
2145+ (int) nwritten, amount);
2146+ nwritten -= (nwritten & 511);
2147+ /* Round down to a block */
2148+ }
2149+ file_offset += nwritten;
2150+ amount_left_to_write -= nwritten;
2151+ fsg->residue -= nwritten;
2152+
2153+ /* If an error occurred, report it and its position */
2154+ if (nwritten < amount) {
2155+ curlun->sense_data = SS_WRITE_ERROR;
2156+ curlun->sense_data_info = file_offset >> 9;
2157+ curlun->info_valid = 1;
2158+ break;
2159+ }
2160+
2161+ /* Did the host decide to stop early? */
2162+ if (bh->outreq->actual != bh->outreq->length) {
2163+ fsg->short_packet_received = 1;
2164+ break;
2165+ }
2166+ continue;
2167+ }
2168+
2169+ /* Wait for something to happen */
2170+ rc = sleep_thread(fsg);
2171+ if (rc)
2172+ return rc;
2173+ }
2174+
2175+ return -EIO; /* No default reply */
2176+}
2177+
2178+
2179+/*-------------------------------------------------------------------------*/
2180+
2181+/* Sync the file data, don't bother with the metadata.
2182+ * The caller must own fsg->filesem.
2183+ * This code was copied from fs/buffer.c:sys_fdatasync(). */
2184+static int fsync_sub(struct lun *curlun)
2185+{
2186+ struct file *filp = curlun->filp;
2187+ struct inode *inode;
2188+ int rc, err;
2189+
2190+ if (curlun->ro || !filp)
2191+ return 0;
2192+ if (!filp->f_op->fsync)
2193+ return -EINVAL;
2194+
2195+ inode = filp->f_path.dentry->d_inode;
2196+ mutex_lock(&inode->i_mutex);
2197+ rc = filemap_fdatawrite(inode->i_mapping);
2198+ err = filp->f_op->fsync(filp, filp->f_path.dentry, 1);
2199+ if (!rc)
2200+ rc = err;
2201+ err = filemap_fdatawait(inode->i_mapping);
2202+ if (!rc)
2203+ rc = err;
2204+ mutex_unlock(&inode->i_mutex);
2205+ VLDBG(curlun, "fdatasync -> %d\n", rc);
2206+ return rc;
2207+}
2208+
2209+static void fsync_all(struct fsg_dev *fsg)
2210+{
2211+ int i;
2212+
2213+ for (i = 0; i < fsg->nluns; ++i)
2214+ fsync_sub(&fsg->luns[i]);
2215+}
2216+
2217+static int do_synchronize_cache(struct fsg_dev *fsg)
2218+{
2219+ struct lun *curlun = fsg->curlun;
2220+ int rc;
2221+
2222+ /* We ignore the requested LBA and write out all file's
2223+ * dirty data buffers. */
2224+ rc = fsync_sub(curlun);
2225+ if (rc)
2226+ curlun->sense_data = SS_WRITE_ERROR;
2227+ return 0;
2228+}
2229+
2230+
2231+/*-------------------------------------------------------------------------*/
2232+
2233+static void invalidate_sub(struct lun *curlun)
2234+{
2235+ struct file *filp = curlun->filp;
2236+ struct inode *inode = filp->f_path.dentry->d_inode;
2237+ unsigned long rc;
2238+
2239+ rc = invalidate_mapping_pages(inode->i_mapping, 0, -1);
2240+ VLDBG(curlun, "invalidate_inode_pages -> %ld\n", rc);
2241+}
2242+
2243+static int do_verify(struct fsg_dev *fsg)
2244+{
2245+ struct lun *curlun = fsg->curlun;
2246+ u32 lba;
2247+ u32 verification_length;
2248+ struct fsg_buffhd *bh = fsg->next_buffhd_to_fill;
2249+ loff_t file_offset, file_offset_tmp;
2250+ u32 amount_left;
2251+ unsigned int amount;
2252+ ssize_t nread;
2253+
2254+ /* Get the starting Logical Block Address and check that it's
2255+ * not too big */
2256+ lba = get_be32(&fsg->cmnd[2]);
2257+ if (lba >= curlun->num_sectors) {
2258+ curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
2259+ return -EINVAL;
2260+ }
2261+
2262+ /* We allow DPO (Disable Page Out = don't save data in the
2263+ * cache) but we don't implement it. */
2264+ if ((fsg->cmnd[1] & ~0x10) != 0) {
2265+ curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
2266+ return -EINVAL;
2267+ }
2268+
2269+ verification_length = get_be16(&fsg->cmnd[7]);
2270+ if (unlikely(verification_length == 0))
2271+ return -EIO; /* No default reply */
2272+
2273+ /* Prepare to carry out the file verify */
2274+ amount_left = verification_length << 9;
2275+ file_offset = ((loff_t) lba) << 9;
2276+
2277+ /* Write out all the dirty buffers before invalidating them */
2278+ fsync_sub(curlun);
2279+ if (signal_pending(current))
2280+ return -EINTR;
2281+
2282+ invalidate_sub(curlun);
2283+ if (signal_pending(current))
2284+ return -EINTR;
2285+
2286+ /* Just try to read the requested blocks */
2287+ while (amount_left > 0) {
2288+
2289+ /* Figure out how much we need to read:
2290+ * Try to read the remaining amount, but not more than
2291+ * the buffer size.
2292+ * And don't try to read past the end of the file.
2293+ * If this means reading 0 then we were asked to read
2294+ * past the end of file. */
2295+ amount = min((unsigned int) amount_left,
2296+ (unsigned int)fsg->buf_size);
2297+ amount = min((loff_t) amount,
2298+ curlun->file_length - file_offset);
2299+ if (amount == 0) {
2300+ curlun->sense_data =
2301+ SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
2302+ curlun->sense_data_info = file_offset >> 9;
2303+ curlun->info_valid = 1;
2304+ break;
2305+ }
2306+
2307+ /* Perform the read */
2308+ file_offset_tmp = file_offset;
2309+ nread = vfs_read(curlun->filp,
2310+ (char __user *) bh->buf,
2311+ amount, &file_offset_tmp);
2312+ VLDBG(curlun, "file read %u @ %llu -> %d\n", amount,
2313+ (unsigned long long) file_offset,
2314+ (int) nread);
2315+ if (signal_pending(current))
2316+ return -EINTR;
2317+
2318+ if (nread < 0) {
2319+ LDBG(curlun, "error in file verify: %d\n",
2320+ (int) nread);
2321+ nread = 0;
2322+ } else if (nread < amount) {
2323+ LDBG(curlun, "partial file verify: %d/%u\n",
2324+ (int) nread, amount);
2325+ nread -= (nread & 511); /* Round down to a sector */
2326+ }
2327+ if (nread == 0) {
2328+ curlun->sense_data = SS_UNRECOVERED_READ_ERROR;
2329+ curlun->sense_data_info = file_offset >> 9;
2330+ curlun->info_valid = 1;
2331+ break;
2332+ }
2333+ file_offset += nread;
2334+ amount_left -= nread;
2335+ }
2336+ return 0;
2337+}
2338+
2339+
2340+/*-------------------------------------------------------------------------*/
2341+
2342+static int do_inquiry(struct fsg_dev *fsg, struct fsg_buffhd *bh)
2343+{
2344+ u8 *buf = (u8 *) bh->buf;
2345+
2346+ if (!fsg->curlun) { /* Unsupported LUNs are okay */
2347+ fsg->bad_lun_okay = 1;
2348+ memset(buf, 0, 36);
2349+ buf[0] = 0x7f; /* Unsupported, no device-type */
2350+ return 36;
2351+ }
2352+
2353+ memset(buf, 0, 8); /* Non-removable, direct-access device */
2354+
2355+ buf[1] = 0x80; /* set removable bit */
2356+ buf[2] = 2; /* ANSI SCSI level 2 */
2357+ buf[3] = 2; /* SCSI-2 INQUIRY data format */
2358+ buf[4] = 31; /* Additional length */
2359+ /* No special options */
2360+ sprintf(buf + 8, "%-8s%-16s%04x", fsg->vendor,
2361+ fsg->product, fsg->release);
2362+ return 36;
2363+}
2364+
2365+
2366+static int do_request_sense(struct fsg_dev *fsg, struct fsg_buffhd *bh)
2367+{
2368+ struct lun *curlun = fsg->curlun;
2369+ u8 *buf = (u8 *) bh->buf;
2370+ u32 sd, sdinfo;
2371+ int valid;
2372+
2373+ /*
2374+ * From the SCSI-2 spec., section 7.9 (Unit attention condition):
2375+ *
2376+ * If a REQUEST SENSE command is received from an initiator
2377+ * with a pending unit attention condition (before the target
2378+ * generates the contingent allegiance condition), then the
2379+ * target shall either:
2380+ * a) report any pending sense data and preserve the unit
2381+ * attention condition on the logical unit, or,
2382+ * b) report the unit attention condition, may discard any
2383+ * pending sense data, and clear the unit attention
2384+ * condition on the logical unit for that initiator.
2385+ *
2386+ * FSG normally uses option a); enable this code to use option b).
2387+ */
2388+#if 0
2389+ if (curlun && curlun->unit_attention_data != SS_NO_SENSE) {
2390+ curlun->sense_data = curlun->unit_attention_data;
2391+ curlun->unit_attention_data = SS_NO_SENSE;
2392+ }
2393+#endif
2394+
2395+ if (!curlun) { /* Unsupported LUNs are okay */
2396+ fsg->bad_lun_okay = 1;
2397+ sd = SS_LOGICAL_UNIT_NOT_SUPPORTED;
2398+ sdinfo = 0;
2399+ valid = 0;
2400+ } else {
2401+ sd = curlun->sense_data;
2402+ sdinfo = curlun->sense_data_info;
2403+ valid = curlun->info_valid << 7;
2404+ curlun->sense_data = SS_NO_SENSE;
2405+ curlun->sense_data_info = 0;
2406+ curlun->info_valid = 0;
2407+ }
2408+
2409+ memset(buf, 0, 18);
2410+ buf[0] = valid | 0x70; /* Valid, current error */
2411+ buf[2] = SK(sd);
2412+ put_be32(&buf[3], sdinfo); /* Sense information */
2413+ buf[7] = 18 - 8; /* Additional sense length */
2414+ buf[12] = ASC(sd);
2415+ buf[13] = ASCQ(sd);
2416+ return 18;
2417+}
2418+
2419+
2420+static int do_read_capacity(struct fsg_dev *fsg, struct fsg_buffhd *bh)
2421+{
2422+ struct lun *curlun = fsg->curlun;
2423+ u32 lba = get_be32(&fsg->cmnd[2]);
2424+ int pmi = fsg->cmnd[8];
2425+ u8 *buf = (u8 *) bh->buf;
2426+
2427+ /* Check the PMI and LBA fields */
2428+ if (pmi > 1 || (pmi == 0 && lba != 0)) {
2429+ curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
2430+ return -EINVAL;
2431+ }
2432+
2433+ put_be32(&buf[0], curlun->num_sectors - 1); /* Max logical block */
2434+ put_be32(&buf[4], 512); /* Block length */
2435+ return 8;
2436+}
2437+
2438+
2439+static int do_mode_sense(struct fsg_dev *fsg, struct fsg_buffhd *bh)
2440+{
2441+ struct lun *curlun = fsg->curlun;
2442+ int mscmnd = fsg->cmnd[0];
2443+ u8 *buf = (u8 *) bh->buf;
2444+ u8 *buf0 = buf;
2445+ int pc, page_code;
2446+ int changeable_values, all_pages;
2447+ int valid_page = 0;
2448+ int len, limit;
2449+
2450+ if ((fsg->cmnd[1] & ~0x08) != 0) { /* Mask away DBD */
2451+ curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
2452+ return -EINVAL;
2453+ }
2454+ pc = fsg->cmnd[2] >> 6;
2455+ page_code = fsg->cmnd[2] & 0x3f;
2456+ if (pc == 3) {
2457+ curlun->sense_data = SS_SAVING_PARAMETERS_NOT_SUPPORTED;
2458+ return -EINVAL;
2459+ }
2460+ changeable_values = (pc == 1);
2461+ all_pages = (page_code == 0x3f);
2462+
2463+ /* Write the mode parameter header. Fixed values are: default
2464+ * medium type, no cache control (DPOFUA), and no block descriptors.
2465+ * The only variable value is the WriteProtect bit. We will fill in
2466+ * the mode data length later. */
2467+ memset(buf, 0, 8);
2468+ if (mscmnd == SC_MODE_SENSE_6) {
2469+ buf[2] = (curlun->ro ? 0x80 : 0x00); /* WP, DPOFUA */
2470+ buf += 4;
2471+ limit = 255;
2472+ } else { /* SC_MODE_SENSE_10 */
2473+ buf[3] = (curlun->ro ? 0x80 : 0x00); /* WP, DPOFUA */
2474+ buf += 8;
2475+ limit = 65535;
2476+ }
2477+
2478+ /* No block descriptors */
2479+
2480+ /* Disabled to workaround USB reset problems with a Vista host.
2481+ */
2482+#if 0
2483+ /* The mode pages, in numerical order. The only page we support
2484+ * is the Caching page. */
2485+ if (page_code == 0x08 || all_pages) {
2486+ valid_page = 1;
2487+ buf[0] = 0x08; /* Page code */
2488+ buf[1] = 10; /* Page length */
2489+ memset(buf+2, 0, 10); /* None of the fields are changeable */
2490+
2491+ if (!changeable_values) {
2492+ buf[2] = 0x04; /* Write cache enable, */
2493+ /* Read cache not disabled */
2494+ /* No cache retention priorities */
2495+ put_be16(&buf[4], 0xffff); /* Don't disable prefetch */
2496+ /* Minimum prefetch = 0 */
2497+ put_be16(&buf[8], 0xffff); /* Maximum prefetch */
2498+ /* Maximum prefetch ceiling */
2499+ put_be16(&buf[10], 0xffff);
2500+ }
2501+ buf += 12;
2502+ }
2503+#else
2504+ valid_page = 1;
2505+#endif
2506+
2507+ /* Check that a valid page was requested and the mode data length
2508+ * isn't too long. */
2509+ len = buf - buf0;
2510+ if (!valid_page || len > limit) {
2511+ curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
2512+ return -EINVAL;
2513+ }
2514+
2515+ /* Store the mode data length */
2516+ if (mscmnd == SC_MODE_SENSE_6)
2517+ buf0[0] = len - 1;
2518+ else
2519+ put_be16(buf0, len - 2);
2520+ return len;
2521+}
2522+
2523+static int do_start_stop(struct fsg_dev *fsg)
2524+{
2525+ struct lun *curlun = fsg->curlun;
2526+ int loej, start;
2527+
2528+ /* int immed = fsg->cmnd[1] & 0x01; */
2529+ loej = fsg->cmnd[4] & 0x02;
2530+ start = fsg->cmnd[4] & 0x01;
2531+
2532+ if (loej) {
2533+ /* eject request from the host */
2534+ if (backing_file_is_open(curlun)) {
2535+ close_backing_file(fsg, curlun);
2536+ curlun->unit_attention_data = SS_MEDIUM_NOT_PRESENT;
2537+ }
2538+ }
2539+
2540+ return 0;
2541+}
2542+
2543+static int do_prevent_allow(struct fsg_dev *fsg)
2544+{
2545+ struct lun *curlun = fsg->curlun;
2546+ int prevent;
2547+
2548+ prevent = fsg->cmnd[4] & 0x01;
2549+ if ((fsg->cmnd[4] & ~0x01) != 0) { /* Mask away Prevent */
2550+ curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
2551+ return -EINVAL;
2552+ }
2553+
2554+ if (curlun->prevent_medium_removal && !prevent)
2555+ fsync_sub(curlun);
2556+ curlun->prevent_medium_removal = prevent;
2557+ return 0;
2558+}
2559+
2560+
2561+static int do_read_format_capacities(struct fsg_dev *fsg,
2562+ struct fsg_buffhd *bh)
2563+{
2564+ struct lun *curlun = fsg->curlun;
2565+ u8 *buf = (u8 *) bh->buf;
2566+
2567+ buf[0] = buf[1] = buf[2] = 0;
2568+ buf[3] = 8; /* Only the Current/Maximum Capacity Descriptor */
2569+ buf += 4;
2570+
2571+ put_be32(&buf[0], curlun->num_sectors); /* Number of blocks */
2572+ put_be32(&buf[4], 512); /* Block length */
2573+ buf[4] = 0x02; /* Current capacity */
2574+ return 12;
2575+}
2576+
2577+
2578+static int do_mode_select(struct fsg_dev *fsg, struct fsg_buffhd *bh)
2579+{
2580+ struct lun *curlun = fsg->curlun;
2581+
2582+ /* We don't support MODE SELECT */
2583+ curlun->sense_data = SS_INVALID_COMMAND;
2584+ return -EINVAL;
2585+}
2586+
2587+
2588+/*-------------------------------------------------------------------------*/
2589+#if 0
2590+static int write_zero(struct fsg_dev *fsg)
2591+{
2592+ struct fsg_buffhd *bh;
2593+ int rc;
2594+
2595+ DBG(fsg, "write_zero\n");
2596+ /* Wait for the next buffer to become available */
2597+ bh = fsg->next_buffhd_to_fill;
2598+ while (bh->state != BUF_STATE_EMPTY) {
2599+ rc = sleep_thread(fsg);
2600+ if (rc)
2601+ return rc;
2602+ }
2603+
2604+ bh->inreq->length = 0;
2605+ start_transfer(fsg, fsg->bulk_in, bh->inreq,
2606+ &bh->inreq_busy, &bh->state);
2607+
2608+ fsg->next_buffhd_to_fill = bh->next;
2609+ return 0;
2610+}
2611+#endif
2612+
2613+static int throw_away_data(struct fsg_dev *fsg)
2614+{
2615+ struct fsg_buffhd *bh;
2616+ u32 amount;
2617+ int rc;
2618+
2619+ DBG(fsg, "throw_away_data\n");
2620+ while ((bh = fsg->next_buffhd_to_drain)->state != BUF_STATE_EMPTY ||
2621+ fsg->usb_amount_left > 0) {
2622+
2623+ /* Throw away the data in a filled buffer */
2624+ if (bh->state == BUF_STATE_FULL) {
2625+ smp_rmb();
2626+ bh->state = BUF_STATE_EMPTY;
2627+ fsg->next_buffhd_to_drain = bh->next;
2628+
2629+ /* A short packet or an error ends everything */
2630+ if (bh->outreq->actual != bh->outreq->length ||
2631+ bh->outreq->status != 0) {
2632+ raise_exception(fsg, FSG_STATE_ABORT_BULK_OUT);
2633+ return -EINTR;
2634+ }
2635+ continue;
2636+ }
2637+
2638+ /* Try to submit another request if we need one */
2639+ bh = fsg->next_buffhd_to_fill;
2640+ if (bh->state == BUF_STATE_EMPTY && fsg->usb_amount_left > 0) {
2641+ amount = min(fsg->usb_amount_left, (u32) fsg->buf_size);
2642+
2643+ /* amount is always divisible by 512, hence by
2644+ * the bulk-out maxpacket size */
2645+ bh->outreq->length = bh->bulk_out_intended_length =
2646+ amount;
2647+ start_transfer(fsg, fsg->bulk_out, bh->outreq,
2648+ &bh->outreq_busy, &bh->state);
2649+ fsg->next_buffhd_to_fill = bh->next;
2650+ fsg->usb_amount_left -= amount;
2651+ continue;
2652+ }
2653+
2654+ /* Otherwise wait for something to happen */
2655+ rc = sleep_thread(fsg);
2656+ if (rc)
2657+ return rc;
2658+ }
2659+ return 0;
2660+}
2661+
2662+
2663+static int finish_reply(struct fsg_dev *fsg)
2664+{
2665+ struct fsg_buffhd *bh = fsg->next_buffhd_to_fill;
2666+ int rc = 0;
2667+
2668+ switch (fsg->data_dir) {
2669+ case DATA_DIR_NONE:
2670+ break; /* Nothing to send */
2671+
2672+ case DATA_DIR_UNKNOWN:
2673+ rc = -EINVAL;
2674+ break;
2675+
2676+ /* All but the last buffer of data must have already been sent */
2677+ case DATA_DIR_TO_HOST:
2678+ if (fsg->data_size == 0)
2679+ ; /* Nothing to send */
2680+
2681+ /* If there's no residue, simply send the last buffer */
2682+ else if (fsg->residue == 0) {
2683+ start_transfer(fsg, fsg->bulk_in, bh->inreq,
2684+ &bh->inreq_busy, &bh->state);
2685+ fsg->next_buffhd_to_fill = bh->next;
2686+ } else {
2687+ start_transfer(fsg, fsg->bulk_in, bh->inreq,
2688+ &bh->inreq_busy, &bh->state);
2689+ fsg->next_buffhd_to_fill = bh->next;
2690+#if 0
2691+ /* this is unnecessary, and was causing problems with MacOS */
2692+ if (bh->inreq->length > 0)
2693+ write_zero(fsg);
2694+#endif
2695+ }
2696+ break;
2697+
2698+ /* We have processed all we want from the data the host has sent.
2699+ * There may still be outstanding bulk-out requests. */
2700+ case DATA_DIR_FROM_HOST:
2701+ if (fsg->residue == 0)
2702+ ; /* Nothing to receive */
2703+
2704+ /* Did the host stop sending unexpectedly early? */
2705+ else if (fsg->short_packet_received) {
2706+ raise_exception(fsg, FSG_STATE_ABORT_BULK_OUT);
2707+ rc = -EINTR;
2708+ }
2709+
2710+ /* We haven't processed all the incoming data. Even though
2711+ * we may be allowed to stall, doing so would cause a race.
2712+ * The controller may already have ACK'ed all the remaining
2713+ * bulk-out packets, in which case the host wouldn't see a
2714+ * STALL. Not realizing the endpoint was halted, it wouldn't
2715+ * clear the halt -- leading to problems later on. */
2716+#if 0
2717+ fsg_set_halt(fsg, fsg->bulk_out);
2718+ raise_exception(fsg, FSG_STATE_ABORT_BULK_OUT);
2719+ rc = -EINTR;
2720+#endif
2721+
2722+ /* We can't stall. Read in the excess data and throw it
2723+ * all away. */
2724+ else
2725+ rc = throw_away_data(fsg);
2726+ break;
2727+ }
2728+ return rc;
2729+}
2730+
2731+
2732+static int send_status(struct fsg_dev *fsg)
2733+{
2734+ struct lun *curlun = fsg->curlun;
2735+ struct fsg_buffhd *bh;
2736+ int rc;
2737+ u8 status = USB_STATUS_PASS;
2738+ u32 sd, sdinfo = 0;
2739+ struct bulk_cs_wrap *csw;
2740+
2741+ DBG(fsg, "send_status\n");
2742+ /* Wait for the next buffer to become available */
2743+ bh = fsg->next_buffhd_to_fill;
2744+ while (bh->state != BUF_STATE_EMPTY) {
2745+ rc = sleep_thread(fsg);
2746+ if (rc)
2747+ return rc;
2748+ }
2749+
2750+ if (curlun) {
2751+ sd = curlun->sense_data;
2752+ sdinfo = curlun->sense_data_info;
2753+ } else if (fsg->bad_lun_okay)
2754+ sd = SS_NO_SENSE;
2755+ else
2756+ sd = SS_LOGICAL_UNIT_NOT_SUPPORTED;
2757+
2758+ if (fsg->phase_error) {
2759+ DBG(fsg, "sending phase-error status\n");
2760+ status = USB_STATUS_PHASE_ERROR;
2761+ sd = SS_INVALID_COMMAND;
2762+ } else if (sd != SS_NO_SENSE) {
2763+ DBG(fsg, "sending command-failure status\n");
2764+ status = USB_STATUS_FAIL;
2765+ VDBG(fsg, " sense data: SK x%02x, ASC x%02x, ASCQ x%02x;"
2766+ " info x%x\n",
2767+ SK(sd), ASC(sd), ASCQ(sd), sdinfo);
2768+ }
2769+
2770+ csw = bh->buf;
2771+
2772+ /* Store and send the Bulk-only CSW */
2773+ csw->Signature = __constant_cpu_to_le32(USB_BULK_CS_SIG);
2774+ csw->Tag = fsg->tag;
2775+ csw->Residue = cpu_to_le32(fsg->residue);
2776+ csw->Status = status;
2777+
2778+ bh->inreq->length = USB_BULK_CS_WRAP_LEN;
2779+ start_transfer(fsg, fsg->bulk_in, bh->inreq,
2780+ &bh->inreq_busy, &bh->state);
2781+
2782+ fsg->next_buffhd_to_fill = bh->next;
2783+ return 0;
2784+}
2785+
2786+
2787+/*-------------------------------------------------------------------------*/
2788+
2789+/* Check whether the command is properly formed and whether its data size
2790+ * and direction agree with the values we already have. */
2791+static int check_command(struct fsg_dev *fsg, int cmnd_size,
2792+ enum data_direction data_dir, unsigned int mask,
2793+ int needs_medium, const char *name)
2794+{
2795+ int i;
2796+ int lun = fsg->cmnd[1] >> 5;
2797+ static const char dirletter[4] = {'u', 'o', 'i', 'n'};
2798+ char hdlen[20];
2799+ struct lun *curlun;
2800+
2801+ hdlen[0] = 0;
2802+ if (fsg->data_dir != DATA_DIR_UNKNOWN)
2803+ sprintf(hdlen, ", H%c=%u", dirletter[(int) fsg->data_dir],
2804+ fsg->data_size);
2805+ VDBG(fsg, "SCSI command: %s; Dc=%d, D%c=%u; Hc=%d%s\n",
2806+ name, cmnd_size, dirletter[(int) data_dir],
2807+ fsg->data_size_from_cmnd, fsg->cmnd_size, hdlen);
2808+
2809+ /* We can't reply at all until we know the correct data direction
2810+ * and size. */
2811+ if (fsg->data_size_from_cmnd == 0)
2812+ data_dir = DATA_DIR_NONE;
2813+ if (fsg->data_dir == DATA_DIR_UNKNOWN) { /* CB or CBI */
2814+ fsg->data_dir = data_dir;
2815+ fsg->data_size = fsg->data_size_from_cmnd;
2816+
2817+ } else { /* Bulk-only */
2818+ if (fsg->data_size < fsg->data_size_from_cmnd) {
2819+
2820+ /* Host data size < Device data size is a phase error.
2821+ * Carry out the command, but only transfer as much
2822+ * as we are allowed. */
2823+ DBG(fsg, "phase error 1\n");
2824+ fsg->data_size_from_cmnd = fsg->data_size;
2825+ fsg->phase_error = 1;
2826+ }
2827+ }
2828+ fsg->residue = fsg->usb_amount_left = fsg->data_size;
2829+
2830+ /* Conflicting data directions is a phase error */
2831+ if (fsg->data_dir != data_dir && fsg->data_size_from_cmnd > 0) {
2832+ fsg->phase_error = 1;
2833+ DBG(fsg, "phase error 2\n");
2834+ return -EINVAL;
2835+ }
2836+
2837+ /* Verify the length of the command itself */
2838+ if (cmnd_size != fsg->cmnd_size) {
2839+
2840+ /* Special case workaround: MS-Windows issues REQUEST SENSE
2841+ * with cbw->Length == 12 (it should be 6). */
2842+ if (fsg->cmnd[0] == SC_REQUEST_SENSE && fsg->cmnd_size == 12)
2843+ cmnd_size = fsg->cmnd_size;
2844+ else {
2845+ fsg->phase_error = 1;
2846+ return -EINVAL;
2847+ }
2848+ }
2849+
2850+ /* Check that the LUN values are consistent */
2851+ if (fsg->lun != lun)
2852+ DBG(fsg, "using LUN %d from CBW, "
2853+ "not LUN %d from CDB\n",
2854+ fsg->lun, lun);
2855+
2856+ /* Check the LUN */
2857+ if (fsg->lun >= 0 && fsg->lun < fsg->nluns) {
2858+ fsg->curlun = curlun = &fsg->luns[fsg->lun];
2859+ if (fsg->cmnd[0] != SC_REQUEST_SENSE) {
2860+ curlun->sense_data = SS_NO_SENSE;
2861+ curlun->sense_data_info = 0;
2862+ curlun->info_valid = 0;
2863+ }
2864+ } else {
2865+ fsg->curlun = curlun = NULL;
2866+ fsg->bad_lun_okay = 0;
2867+
2868+ /* INQUIRY and REQUEST SENSE commands are explicitly allowed
2869+ * to use unsupported LUNs; all others may not. */
2870+ if (fsg->cmnd[0] != SC_INQUIRY &&
2871+ fsg->cmnd[0] != SC_REQUEST_SENSE) {
2872+ DBG(fsg, "unsupported LUN %d\n", fsg->lun);
2873+ return -EINVAL;
2874+ }
2875+ }
2876+
2877+ /* If a unit attention condition exists, only INQUIRY and
2878+ * REQUEST SENSE commands are allowed; anything else must fail. */
2879+ if (curlun && curlun->unit_attention_data != SS_NO_SENSE &&
2880+ fsg->cmnd[0] != SC_INQUIRY &&
2881+ fsg->cmnd[0] != SC_REQUEST_SENSE) {
2882+ curlun->sense_data = curlun->unit_attention_data;
2883+ curlun->unit_attention_data = SS_NO_SENSE;
2884+ return -EINVAL;
2885+ }
2886+
2887+ /* Check that only command bytes listed in the mask are non-zero */
2888+ fsg->cmnd[1] &= 0x1f; /* Mask away the LUN */
2889+ for (i = 1; i < cmnd_size; ++i) {
2890+ if (fsg->cmnd[i] && !(mask & (1 << i))) {
2891+ if (curlun)
2892+ curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
2893+ DBG(fsg, "SS_INVALID_FIELD_IN_CDB\n");
2894+ return -EINVAL;
2895+ }
2896+ }
2897+
2898+ /* If the medium isn't mounted and the command needs to access
2899+ * it, return an error. */
2900+ if (curlun && !backing_file_is_open(curlun) && needs_medium) {
2901+ curlun->sense_data = SS_MEDIUM_NOT_PRESENT;
2902+ DBG(fsg, "SS_MEDIUM_NOT_PRESENT\n");
2903+ return -EINVAL;
2904+ }
2905+
2906+ return 0;
2907+}
2908+
2909+
2910+static int do_scsi_command(struct fsg_dev *fsg)
2911+{
2912+ struct fsg_buffhd *bh;
2913+ int rc;
2914+ int reply = -EINVAL;
2915+ int i;
2916+ static char unknown[16];
2917+
2918+ dump_cdb(fsg);
2919+
2920+ /* Wait for the next buffer to become available for data or status */
2921+ bh = fsg->next_buffhd_to_drain = fsg->next_buffhd_to_fill;
2922+ while (bh->state != BUF_STATE_EMPTY) {
2923+ rc = sleep_thread(fsg);
2924+ if (rc)
2925+ return rc;
2926+ }
2927+ fsg->phase_error = 0;
2928+ fsg->short_packet_received = 0;
2929+
2930+ down_read(&fsg->filesem); /* We're using the backing file */
2931+ switch (fsg->cmnd[0]) {
2932+
2933+ case SC_INQUIRY:
2934+ fsg->data_size_from_cmnd = fsg->cmnd[4];
2935+ if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST,
2936+ (1<<4), 0,
2937+ "INQUIRY")) == 0)
2938+ reply = do_inquiry(fsg, bh);
2939+ break;
2940+
2941+ case SC_MODE_SELECT_6:
2942+ fsg->data_size_from_cmnd = fsg->cmnd[4];
2943+ if ((reply = check_command(fsg, 6, DATA_DIR_FROM_HOST,
2944+ (1<<1) | (1<<4), 0,
2945+ "MODE SELECT(6)")) == 0)
2946+ reply = do_mode_select(fsg, bh);
2947+ break;
2948+
2949+ case SC_MODE_SELECT_10:
2950+ fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]);
2951+ if ((reply = check_command(fsg, 10, DATA_DIR_FROM_HOST,
2952+ (1<<1) | (3<<7), 0,
2953+ "MODE SELECT(10)")) == 0)
2954+ reply = do_mode_select(fsg, bh);
2955+ break;
2956+
2957+ case SC_MODE_SENSE_6:
2958+ fsg->data_size_from_cmnd = fsg->cmnd[4];
2959+ if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST,
2960+ (1<<1) | (1<<2) | (1<<4), 0,
2961+ "MODE SENSE(6)")) == 0)
2962+ reply = do_mode_sense(fsg, bh);
2963+ break;
2964+
2965+ case SC_MODE_SENSE_10:
2966+ fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]);
2967+ if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
2968+ (1<<1) | (1<<2) | (3<<7), 0,
2969+ "MODE SENSE(10)")) == 0)
2970+ reply = do_mode_sense(fsg, bh);
2971+ break;
2972+
2973+ case SC_PREVENT_ALLOW_MEDIUM_REMOVAL:
2974+ fsg->data_size_from_cmnd = 0;
2975+ if ((reply = check_command(fsg, 6, DATA_DIR_NONE,
2976+ (1<<4), 0,
2977+ "PREVENT-ALLOW MEDIUM REMOVAL")) == 0)
2978+ reply = do_prevent_allow(fsg);
2979+ break;
2980+
2981+ case SC_READ_6:
2982+ i = fsg->cmnd[4];
2983+ fsg->data_size_from_cmnd = (i == 0 ? 256 : i) << 9;
2984+ if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST,
2985+ (7<<1) | (1<<4), 1,
2986+ "READ(6)")) == 0)
2987+ reply = do_read(fsg);
2988+ break;
2989+
2990+ case SC_READ_10:
2991+ fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]) << 9;
2992+ if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
2993+ (1<<1) | (0xf<<2) | (3<<7), 1,
2994+ "READ(10)")) == 0)
2995+ reply = do_read(fsg);
2996+ break;
2997+
2998+ case SC_READ_12:
2999+ fsg->data_size_from_cmnd = get_be32(&fsg->cmnd[6]) << 9;
3000+ if ((reply = check_command(fsg, 12, DATA_DIR_TO_HOST,
3001+ (1<<1) | (0xf<<2) | (0xf<<6), 1,
3002+ "READ(12)")) == 0)
3003+ reply = do_read(fsg);
3004+ break;
3005+
3006+ case SC_READ_CAPACITY:
3007+ fsg->data_size_from_cmnd = 8;
3008+ if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
3009+ (0xf<<2) | (1<<8), 1,
3010+ "READ CAPACITY")) == 0)
3011+ reply = do_read_capacity(fsg, bh);
3012+ break;
3013+
3014+ case SC_READ_FORMAT_CAPACITIES:
3015+ fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]);
3016+ if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
3017+ (3<<7), 1,
3018+ "READ FORMAT CAPACITIES")) == 0)
3019+ reply = do_read_format_capacities(fsg, bh);
3020+ break;
3021+
3022+ case SC_REQUEST_SENSE:
3023+ fsg->data_size_from_cmnd = fsg->cmnd[4];
3024+ if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST,
3025+ (1<<4), 0,
3026+ "REQUEST SENSE")) == 0)
3027+ reply = do_request_sense(fsg, bh);
3028+ break;
3029+
3030+ case SC_START_STOP_UNIT:
3031+ fsg->data_size_from_cmnd = 0;
3032+ if ((reply = check_command(fsg, 6, DATA_DIR_NONE,
3033+ (1<<1) | (1<<4), 0,
3034+ "START-STOP UNIT")) == 0)
3035+ reply = do_start_stop(fsg);
3036+ break;
3037+
3038+ case SC_SYNCHRONIZE_CACHE:
3039+ fsg->data_size_from_cmnd = 0;
3040+ if ((reply = check_command(fsg, 10, DATA_DIR_NONE,
3041+ (0xf<<2) | (3<<7), 1,
3042+ "SYNCHRONIZE CACHE")) == 0)
3043+ reply = do_synchronize_cache(fsg);
3044+ break;
3045+
3046+ case SC_TEST_UNIT_READY:
3047+ fsg->data_size_from_cmnd = 0;
3048+ reply = check_command(fsg, 6, DATA_DIR_NONE,
3049+ 0, 1,
3050+ "TEST UNIT READY");
3051+ break;
3052+
3053+ /* Although optional, this command is used by MS-Windows. We
3054+ * support a minimal version: BytChk must be 0. */
3055+ case SC_VERIFY:
3056+ fsg->data_size_from_cmnd = 0;
3057+ if ((reply = check_command(fsg, 10, DATA_DIR_NONE,
3058+ (1<<1) | (0xf<<2) | (3<<7), 1,
3059+ "VERIFY")) == 0)
3060+ reply = do_verify(fsg);
3061+ break;
3062+
3063+ case SC_WRITE_6:
3064+ i = fsg->cmnd[4];
3065+ fsg->data_size_from_cmnd = (i == 0 ? 256 : i) << 9;
3066+ if ((reply = check_command(fsg, 6, DATA_DIR_FROM_HOST,
3067+ (7<<1) | (1<<4), 1,
3068+ "WRITE(6)")) == 0)
3069+ reply = do_write(fsg);
3070+ break;
3071+
3072+ case SC_WRITE_10:
3073+ fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]) << 9;
3074+ if ((reply = check_command(fsg, 10, DATA_DIR_FROM_HOST,
3075+ (1<<1) | (0xf<<2) | (3<<7), 1,
3076+ "WRITE(10)")) == 0)
3077+ reply = do_write(fsg);
3078+ break;
3079+
3080+ case SC_WRITE_12:
3081+ fsg->data_size_from_cmnd = get_be32(&fsg->cmnd[6]) << 9;
3082+ if ((reply = check_command(fsg, 12, DATA_DIR_FROM_HOST,
3083+ (1<<1) | (0xf<<2) | (0xf<<6), 1,
3084+ "WRITE(12)")) == 0)
3085+ reply = do_write(fsg);
3086+ break;
3087+
3088+ /* Some mandatory commands that we recognize but don't implement.
3089+ * They don't mean much in this setting. It's left as an exercise
3090+ * for anyone interested to implement RESERVE and RELEASE in terms
3091+ * of Posix locks. */
3092+ case SC_FORMAT_UNIT:
3093+ case SC_RELEASE:
3094+ case SC_RESERVE:
3095+ case SC_SEND_DIAGNOSTIC:
3096+ /* Fall through */
3097+
3098+ default:
3099+ fsg->data_size_from_cmnd = 0;
3100+ sprintf(unknown, "Unknown x%02x", fsg->cmnd[0]);
3101+ if ((reply = check_command(fsg, fsg->cmnd_size,
3102+ DATA_DIR_UNKNOWN, 0xff, 0, unknown)) == 0) {
3103+ fsg->curlun->sense_data = SS_INVALID_COMMAND;
3104+ reply = -EINVAL;
3105+ }
3106+ break;
3107+ }
3108+ up_read(&fsg->filesem);
3109+
3110+ VDBG(fsg, "reply: %d, fsg->data_size_from_cmnd: %d\n",
3111+ reply, fsg->data_size_from_cmnd);
3112+ if (reply == -EINTR || signal_pending(current))
3113+ return -EINTR;
3114+
3115+ /* Set up the single reply buffer for finish_reply() */
3116+ if (reply == -EINVAL)
3117+ reply = 0; /* Error reply length */
3118+ if (reply >= 0 && fsg->data_dir == DATA_DIR_TO_HOST) {
3119+ reply = min((u32) reply, fsg->data_size_from_cmnd);
3120+ bh->inreq->length = reply;
3121+ bh->state = BUF_STATE_FULL;
3122+ fsg->residue -= reply;
3123+ } /* Otherwise it's already set */
3124+
3125+ return 0;
3126+}
3127+
3128+
3129+/*-------------------------------------------------------------------------*/
3130+
3131+static int received_cbw(struct fsg_dev *fsg, struct fsg_buffhd *bh)
3132+{
3133+ struct usb_request *req = bh->outreq;
3134+ struct bulk_cb_wrap *cbw = req->buf;
3135+
3136+ /* Was this a real packet? */
3137+ if (req->status)
3138+ return -EINVAL;
3139+
3140+ /* Is the CBW valid? */
3141+ if (req->actual != USB_BULK_CB_WRAP_LEN ||
3142+ cbw->Signature != __constant_cpu_to_le32(
3143+ USB_BULK_CB_SIG)) {
3144+ DBG(fsg, "invalid CBW: len %u sig 0x%x\n",
3145+ req->actual,
3146+ le32_to_cpu(cbw->Signature));
3147+ return -EINVAL;
3148+ }
3149+
3150+ /* Is the CBW meaningful? */
3151+ if (cbw->Lun >= MAX_LUNS || cbw->Flags & ~USB_BULK_IN_FLAG ||
3152+ cbw->Length <= 0 || cbw->Length > MAX_COMMAND_SIZE) {
3153+ DBG(fsg, "non-meaningful CBW: lun = %u, flags = 0x%x, "
3154+ "cmdlen %u\n",
3155+ cbw->Lun, cbw->Flags, cbw->Length);
3156+ return -EINVAL;
3157+ }
3158+
3159+ /* Save the command for later */
3160+ fsg->cmnd_size = cbw->Length;
3161+ memcpy(fsg->cmnd, cbw->CDB, fsg->cmnd_size);
3162+ if (cbw->Flags & USB_BULK_IN_FLAG)
3163+ fsg->data_dir = DATA_DIR_TO_HOST;
3164+ else
3165+ fsg->data_dir = DATA_DIR_FROM_HOST;
3166+ fsg->data_size = le32_to_cpu(cbw->DataTransferLength);
3167+ if (fsg->data_size == 0)
3168+ fsg->data_dir = DATA_DIR_NONE;
3169+ fsg->lun = cbw->Lun;
3170+ fsg->tag = cbw->Tag;
3171+ return 0;
3172+}
3173+
3174+
3175+static int get_next_command(struct fsg_dev *fsg)
3176+{
3177+ struct fsg_buffhd *bh;
3178+ int rc = 0;
3179+
3180+ /* Wait for the next buffer to become available */
3181+ bh = fsg->next_buffhd_to_fill;
3182+ while (bh->state != BUF_STATE_EMPTY) {
3183+ rc = sleep_thread(fsg);
3184+ if (rc)
3185+ return rc;
3186+ }
3187+
3188+ /* Queue a request to read a Bulk-only CBW */
3189+ set_bulk_out_req_length(fsg, bh, USB_BULK_CB_WRAP_LEN);
3190+ start_transfer(fsg, fsg->bulk_out, bh->outreq,
3191+ &bh->outreq_busy, &bh->state);
3192+
3193+ /* We will drain the buffer in software, which means we
3194+ * can reuse it for the next filling. No need to advance
3195+ * next_buffhd_to_fill. */
3196+
3197+ /* Wait for the CBW to arrive */
3198+ while (bh->state != BUF_STATE_FULL) {
3199+ rc = sleep_thread(fsg);
3200+ if (rc)
3201+ return rc;
3202+ }
3203+ smp_rmb();
3204+ rc = received_cbw(fsg, bh);
3205+ bh->state = BUF_STATE_EMPTY;
3206+
3207+ return rc;
3208+}
3209+
3210+
3211+/*-------------------------------------------------------------------------*/
3212+
3213+static int enable_endpoint(struct fsg_dev *fsg, struct usb_ep *ep,
3214+ const struct usb_endpoint_descriptor *d)
3215+{
3216+ int rc;
3217+
3218+ DBG(fsg, "usb_ep_enable %s\n", ep->name);
3219+ ep->driver_data = fsg;
3220+ rc = usb_ep_enable(ep, d);
3221+ if (rc)
3222+ ERROR(fsg, "can't enable %s, result %d\n", ep->name, rc);
3223+ return rc;
3224+}
3225+
3226+static int alloc_request(struct fsg_dev *fsg, struct usb_ep *ep,
3227+ struct usb_request **preq)
3228+{
3229+ *preq = usb_ep_alloc_request(ep, GFP_ATOMIC);
3230+ if (*preq)
3231+ return 0;
3232+ ERROR(fsg, "can't allocate request for %s\n", ep->name);
3233+ return -ENOMEM;
3234+}
3235+
3236+/*
3237+ * Reset interface setting and re-init endpoint state (toggle etc).
3238+ * Call with altsetting < 0 to disable the interface. The only other
3239+ * available altsetting is 0, which enables the interface.
3240+ */
3241+static int do_set_interface(struct fsg_dev *fsg, int altsetting)
3242+{
3243+ struct usb_composite_dev *cdev = fsg->cdev;
3244+ int rc = 0;
3245+ int i;
3246+ const struct usb_endpoint_descriptor *d;
3247+
3248+ if (fsg->running)
3249+ DBG(fsg, "reset interface\n");
3250+
3251+reset:
3252+ /* Deallocate the requests */
3253+ for (i = 0; i < NUM_BUFFERS; ++i) {
3254+ struct fsg_buffhd *bh = &fsg->buffhds[i];
3255+
3256+ if (bh->inreq) {
3257+ usb_ep_free_request(fsg->bulk_in, bh->inreq);
3258+ bh->inreq = NULL;
3259+ }
3260+ if (bh->outreq) {
3261+ usb_ep_free_request(fsg->bulk_out, bh->outreq);
3262+ bh->outreq = NULL;
3263+ }
3264+ }
3265+
3266+ /* Disable the endpoints */
3267+ if (fsg->bulk_in_enabled) {
3268+ DBG(fsg, "usb_ep_disable %s\n", fsg->bulk_in->name);
3269+ usb_ep_disable(fsg->bulk_in);
3270+ fsg->bulk_in_enabled = 0;
3271+ }
3272+ if (fsg->bulk_out_enabled) {
3273+ DBG(fsg, "usb_ep_disable %s\n", fsg->bulk_out->name);
3274+ usb_ep_disable(fsg->bulk_out);
3275+ fsg->bulk_out_enabled = 0;
3276+ }
3277+
3278+ fsg->running = 0;
3279+ if (altsetting < 0 || rc != 0)
3280+ return rc;
3281+
3282+ DBG(fsg, "set interface %d\n", altsetting);
3283+
3284+ /* Enable the endpoints */
3285+ d = ep_desc(cdev->gadget, &fs_bulk_in_desc, &hs_bulk_in_desc);
3286+ if ((rc = enable_endpoint(fsg, fsg->bulk_in, d)) != 0)
3287+ goto reset;
3288+ fsg->bulk_in_enabled = 1;
3289+
3290+ d = ep_desc(cdev->gadget, &fs_bulk_out_desc, &hs_bulk_out_desc);
3291+ if ((rc = enable_endpoint(fsg, fsg->bulk_out, d)) != 0)
3292+ goto reset;
3293+ fsg->bulk_out_enabled = 1;
3294+ fsg->bulk_out_maxpacket = le16_to_cpu(d->wMaxPacketSize);
3295+
3296+ /* Allocate the requests */
3297+ for (i = 0; i < NUM_BUFFERS; ++i) {
3298+ struct fsg_buffhd *bh = &fsg->buffhds[i];
3299+
3300+ rc = alloc_request(fsg, fsg->bulk_in, &bh->inreq);
3301+ if (rc != 0)
3302+ goto reset;
3303+ rc = alloc_request(fsg, fsg->bulk_out, &bh->outreq);
3304+ if (rc != 0)
3305+ goto reset;
3306+ bh->inreq->buf = bh->outreq->buf = bh->buf;
3307+ bh->inreq->context = bh->outreq->context = bh;
3308+ bh->inreq->complete = bulk_in_complete;
3309+ bh->outreq->complete = bulk_out_complete;
3310+ }
3311+
3312+ fsg->running = 1;
3313+ for (i = 0; i < fsg->nluns; ++i)
3314+ fsg->luns[i].unit_attention_data = SS_RESET_OCCURRED;
3315+
3316+ return rc;
3317+}
3318+
3319+static void adjust_wake_lock(struct fsg_dev *fsg)
3320+{
3321+ int ums_active = 0;
3322+ int i;
3323+
3324+ spin_lock_irq(&fsg->lock);
3325+
3326+ if (fsg->config) {
3327+ for (i = 0; i < fsg->nluns; ++i) {
3328+ if (backing_file_is_open(&fsg->luns[i]))
3329+ ums_active = 1;
3330+ }
3331+ }
3332+
3333+ if (ums_active)
3334+ wake_lock(&fsg->wake_lock);
3335+ else
3336+ wake_unlock(&fsg->wake_lock);
3337+
3338+ spin_unlock_irq(&fsg->lock);
3339+}
3340+
3341+/*
3342+ * Change our operational configuration. This code must agree with the code
3343+ * that returns config descriptors, and with interface altsetting code.
3344+ *
3345+ * It's also responsible for power management interactions. Some
3346+ * configurations might not work with our current power sources.
3347+ * For now we just assume the gadget is always self-powered.
3348+ */
3349+static int do_set_config(struct fsg_dev *fsg, u8 new_config)
3350+{
3351+ int rc = 0;
3352+
3353+ if (new_config == fsg->config)
3354+ return rc;
3355+
3356+ /* Disable the single interface */
3357+ if (fsg->config != 0) {
3358+ DBG(fsg, "reset config\n");
3359+ fsg->config = 0;
3360+ rc = do_set_interface(fsg, -1);
3361+ }
3362+
3363+ /* Enable the interface */
3364+ if (new_config != 0) {
3365+ fsg->config = new_config;
3366+ rc = do_set_interface(fsg, 0);
3367+ if (rc != 0)
3368+ fsg->config = 0; /* Reset on errors */
3369+ else
3370+ INFO(fsg, "config #%d\n", fsg->config);
3371+ }
3372+
3373+ switch_set_state(&fsg->sdev, new_config);
3374+ adjust_wake_lock(fsg);
3375+ return rc;
3376+}
3377+
3378+
3379+/*-------------------------------------------------------------------------*/
3380+
3381+static void handle_exception(struct fsg_dev *fsg)
3382+{
3383+ siginfo_t info;
3384+ int sig;
3385+ int i;
3386+ struct fsg_buffhd *bh;
3387+ enum fsg_state old_state;
3388+ u8 new_config;
3389+ struct lun *curlun;
3390+ int rc;
3391+
3392+ DBG(fsg, "handle_exception state: %d\n", (int)fsg->state);
3393+ /* Clear the existing signals. Anything but SIGUSR1 is converted
3394+ * into a high-priority EXIT exception. */
3395+ for (;;) {
3396+ sig = dequeue_signal_lock(current, &current->blocked, &info);
3397+ if (!sig)
3398+ break;
3399+ if (sig != SIGUSR1) {
3400+ if (fsg->state < FSG_STATE_EXIT)
3401+ DBG(fsg, "Main thread exiting on signal\n");
3402+ raise_exception(fsg, FSG_STATE_EXIT);
3403+ }
3404+ }
3405+
3406+ /* Clear out the controller's fifos */
3407+ if (fsg->bulk_in_enabled)
3408+ usb_ep_fifo_flush(fsg->bulk_in);
3409+ if (fsg->bulk_out_enabled)
3410+ usb_ep_fifo_flush(fsg->bulk_out);
3411+
3412+ /* Reset the I/O buffer states and pointers, the SCSI
3413+ * state, and the exception. Then invoke the handler. */
3414+ spin_lock_irq(&fsg->lock);
3415+
3416+ for (i = 0; i < NUM_BUFFERS; ++i) {
3417+ bh = &fsg->buffhds[i];
3418+ bh->state = BUF_STATE_EMPTY;
3419+ }
3420+ fsg->next_buffhd_to_fill = fsg->next_buffhd_to_drain =
3421+ &fsg->buffhds[0];
3422+
3423+ new_config = fsg->new_config;
3424+ old_state = fsg->state;
3425+
3426+ if (old_state == FSG_STATE_ABORT_BULK_OUT)
3427+ fsg->state = FSG_STATE_STATUS_PHASE;
3428+ else {
3429+ for (i = 0; i < fsg->nluns; ++i) {
3430+ curlun = &fsg->luns[i];
3431+ curlun->prevent_medium_removal = 0;
3432+ curlun->sense_data = curlun->unit_attention_data =
3433+ SS_NO_SENSE;
3434+ curlun->sense_data_info = 0;
3435+ curlun->info_valid = 0;
3436+ }
3437+ fsg->state = FSG_STATE_IDLE;
3438+ }
3439+ spin_unlock_irq(&fsg->lock);
3440+
3441+ /* Carry out any extra actions required for the exception */
3442+ switch (old_state) {
3443+ default:
3444+ break;
3445+
3446+ case FSG_STATE_ABORT_BULK_OUT:
3447+ DBG(fsg, "FSG_STATE_ABORT_BULK_OUT\n");
3448+ spin_lock_irq(&fsg->lock);
3449+ if (fsg->state == FSG_STATE_STATUS_PHASE)
3450+ fsg->state = FSG_STATE_IDLE;
3451+ spin_unlock_irq(&fsg->lock);
3452+ break;
3453+
3454+ case FSG_STATE_RESET:
3455+ /* really not much to do here */
3456+ break;
3457+
3458+ case FSG_STATE_CONFIG_CHANGE:
3459+ rc = do_set_config(fsg, new_config);
3460+ if (new_config == 0) {
3461+ /* We're using the backing file */
3462+ down_read(&fsg->filesem);
3463+ fsync_all(fsg);
3464+ up_read(&fsg->filesem);
3465+ }
3466+ break;
3467+
3468+ case FSG_STATE_EXIT:
3469+ case FSG_STATE_TERMINATED:
3470+ do_set_config(fsg, 0); /* Free resources */
3471+ spin_lock_irq(&fsg->lock);
3472+ fsg->state = FSG_STATE_TERMINATED; /* Stop the thread */
3473+ spin_unlock_irq(&fsg->lock);
3474+ break;
3475+ }
3476+}
3477+
3478+
3479+/*-------------------------------------------------------------------------*/
3480+
3481+static int fsg_main_thread(void *fsg_)
3482+{
3483+ struct fsg_dev *fsg = fsg_;
3484+
3485+ /* Allow the thread to be killed by a signal, but set the signal mask
3486+ * to block everything but INT, TERM, KILL, and USR1. */
3487+ allow_signal(SIGINT);
3488+ allow_signal(SIGTERM);
3489+ allow_signal(SIGKILL);
3490+ allow_signal(SIGUSR1);
3491+
3492+ /* Allow the thread to be frozen */
3493+ set_freezable();
3494+
3495+ /* Arrange for userspace references to be interpreted as kernel
3496+ * pointers. That way we can pass a kernel pointer to a routine
3497+ * that expects a __user pointer and it will work okay. */
3498+ set_fs(get_ds());
3499+
3500+ /* The main loop */
3501+ while (fsg->state != FSG_STATE_TERMINATED) {
3502+ if (exception_in_progress(fsg) || signal_pending(current)) {
3503+ handle_exception(fsg);
3504+ continue;
3505+ }
3506+
3507+ if (!fsg->running) {
3508+ sleep_thread(fsg);
3509+ continue;
3510+ }
3511+
3512+ if (get_next_command(fsg))
3513+ continue;
3514+
3515+ spin_lock_irq(&fsg->lock);
3516+ if (!exception_in_progress(fsg))
3517+ fsg->state = FSG_STATE_DATA_PHASE;
3518+ spin_unlock_irq(&fsg->lock);
3519+
3520+ if (do_scsi_command(fsg) || finish_reply(fsg))
3521+ continue;
3522+
3523+ spin_lock_irq(&fsg->lock);
3524+ if (!exception_in_progress(fsg))
3525+ fsg->state = FSG_STATE_STATUS_PHASE;
3526+ spin_unlock_irq(&fsg->lock);
3527+
3528+ if (send_status(fsg))
3529+ continue;
3530+
3531+ spin_lock_irq(&fsg->lock);
3532+ if (!exception_in_progress(fsg))
3533+ fsg->state = FSG_STATE_IDLE;
3534+ spin_unlock_irq(&fsg->lock);
3535+ }
3536+
3537+ spin_lock_irq(&fsg->lock);
3538+ fsg->thread_task = NULL;
3539+ spin_unlock_irq(&fsg->lock);
3540+
3541+ /* In case we are exiting because of a signal, unregister the
3542+ * gadget driver and close the backing file. */
3543+ if (test_and_clear_bit(REGISTERED, &fsg->atomic_bitflags))
3544+ close_all_backing_files(fsg);
3545+
3546+ /* Let the unbind and cleanup routines know the thread has exited */
3547+ complete_and_exit(&fsg->thread_notifier, 0);
3548+}
3549+
3550+
3551+/*-------------------------------------------------------------------------*/
3552+
3553+/* If the next two routines are called while the gadget is registered,
3554+ * the caller must own fsg->filesem for writing. */
3555+
3556+static int open_backing_file(struct fsg_dev *fsg, struct lun *curlun,
3557+ const char *filename)
3558+{
3559+ int ro;
3560+ struct file *filp = NULL;
3561+ int rc = -EINVAL;
3562+ struct inode *inode = NULL;
3563+ loff_t size;
3564+ loff_t num_sectors;
3565+
3566+ /* R/W if we can, R/O if we must */
3567+ ro = curlun->ro;
3568+ if (!ro) {
3569+ filp = filp_open(filename, O_RDWR | O_LARGEFILE, 0);
3570+ if (-EROFS == PTR_ERR(filp))
3571+ ro = 1;
3572+ }
3573+ if (ro)
3574+ filp = filp_open(filename, O_RDONLY | O_LARGEFILE, 0);
3575+ if (IS_ERR(filp)) {
3576+ LINFO(curlun, "unable to open backing file: %s\n", filename);
3577+ return PTR_ERR(filp);
3578+ }
3579+
3580+ if (!(filp->f_mode & FMODE_WRITE))
3581+ ro = 1;
3582+
3583+ if (filp->f_path.dentry)
3584+ inode = filp->f_path.dentry->d_inode;
3585+ if (inode && S_ISBLK(inode->i_mode)) {
3586+ if (bdev_read_only(inode->i_bdev))
3587+ ro = 1;
3588+ } else if (!inode || !S_ISREG(inode->i_mode)) {
3589+ LINFO(curlun, "invalid file type: %s\n", filename);
3590+ goto out;
3591+ }
3592+
3593+ /* If we can't read the file, it's no good.
3594+ * If we can't write the file, use it read-only. */
3595+ if (!filp->f_op || !(filp->f_op->read || filp->f_op->aio_read)) {
3596+ LINFO(curlun, "file not readable: %s\n", filename);
3597+ goto out;
3598+ }
3599+ if (!(filp->f_op->write || filp->f_op->aio_write))
3600+ ro = 1;
3601+
3602+ size = i_size_read(inode->i_mapping->host);
3603+ if (size < 0) {
3604+ LINFO(curlun, "unable to find file size: %s\n", filename);
3605+ rc = (int) size;
3606+ goto out;
3607+ }
3608+ num_sectors = size >> 9; /* File size in 512-byte sectors */
3609+ if (num_sectors == 0) {
3610+ LINFO(curlun, "file too small: %s\n", filename);
3611+ rc = -ETOOSMALL;
3612+ goto out;
3613+ }
3614+
3615+ get_file(filp);
3616+ curlun->ro = ro;
3617+ curlun->filp = filp;
3618+ curlun->file_length = size;
3619+ curlun->num_sectors = num_sectors;
3620+ LDBG(curlun, "open backing file: %s size: %lld num_sectors: %lld\n",
3621+ filename, size, num_sectors);
3622+ rc = 0;
3623+ adjust_wake_lock(fsg);
3624+
3625+out:
3626+ filp_close(filp, current->files);
3627+ return rc;
3628+}
3629+
3630+
3631+static void close_backing_file(struct fsg_dev *fsg, struct lun *curlun)
3632+{
3633+ if (curlun->filp) {
3634+ int rc;
3635+
3636+ /*
3637+ * XXX: San: Ugly hack here added to ensure that
3638+ * our pages get synced to disk.
3639+ * Also drop caches here just to be extra-safe
3640+ */
3641+ rc = vfs_fsync(curlun->filp, curlun->filp->f_path.dentry, 1);
3642+ if (rc < 0)
3643+ printk(KERN_ERR "ums: Error syncing data (%d)\n", rc);
3644+ /* drop_pagecache and drop_slab are no longer available */
3645+ /* drop_pagecache(); */
3646+ /* drop_slab(); */
3647+
3648+ LDBG(curlun, "close backing file\n");
3649+ fput(curlun->filp);
3650+ curlun->filp = NULL;
3651+ adjust_wake_lock(fsg);
3652+ }
3653+}
3654+
3655+static void close_all_backing_files(struct fsg_dev *fsg)
3656+{
3657+ int i;
3658+
3659+ for (i = 0; i < fsg->nluns; ++i)
3660+ close_backing_file(fsg, &fsg->luns[i]);
3661+}
3662+
3663+static ssize_t show_file(struct device *dev, struct device_attribute *attr,
3664+ char *buf)
3665+{
3666+ struct lun *curlun = dev_to_lun(dev);
3667+ struct fsg_dev *fsg = dev_get_drvdata(dev);
3668+ char *p;
3669+ ssize_t rc;
3670+
3671+ down_read(&fsg->filesem);
3672+ if (backing_file_is_open(curlun)) { /* Get the complete pathname */
3673+ p = d_path(&curlun->filp->f_path, buf, PAGE_SIZE - 1);
3674+ if (IS_ERR(p))
3675+ rc = PTR_ERR(p);
3676+ else {
3677+ rc = strlen(p);
3678+ memmove(buf, p, rc);
3679+ buf[rc] = '\n'; /* Add a newline */
3680+ buf[++rc] = 0;
3681+ }
3682+ } else { /* No file, return 0 bytes */
3683+ *buf = 0;
3684+ rc = 0;
3685+ }
3686+ up_read(&fsg->filesem);
3687+ return rc;
3688+}
3689+
3690+static ssize_t store_file(struct device *dev, struct device_attribute *attr,
3691+ const char *buf, size_t count)
3692+{
3693+ struct lun *curlun = dev_to_lun(dev);
3694+ struct fsg_dev *fsg = dev_get_drvdata(dev);
3695+ int rc = 0;
3696+
3697+ DBG(fsg, "store_file: \"%s\"\n", buf);
3698+#if 0
3699+ /* disabled because we need to allow closing the backing file if the media was removed */
3700+ if (curlun->prevent_medium_removal && backing_file_is_open(curlun)) {
3701+ LDBG(curlun, "eject attempt prevented\n");
3702+ return -EBUSY; /* "Door is locked" */
3703+ }
3704+#endif
3705+
3706+ /* Remove a trailing newline */
3707+ if (count > 0 && buf[count-1] == '\n')
3708+ ((char *) buf)[count-1] = 0;
3709+
3710+ /* Eject current medium */
3711+ down_write(&fsg->filesem);
3712+ if (backing_file_is_open(curlun)) {
3713+ close_backing_file(fsg, curlun);
3714+ curlun->unit_attention_data = SS_MEDIUM_NOT_PRESENT;
3715+ }
3716+
3717+ /* Load new medium */
3718+ if (count > 0 && buf[0]) {
3719+ rc = open_backing_file(fsg, curlun, buf);
3720+ if (rc == 0)
3721+ curlun->unit_attention_data =
3722+ SS_NOT_READY_TO_READY_TRANSITION;
3723+ }
3724+ up_write(&fsg->filesem);
3725+ return (rc < 0 ? rc : count);
3726+}
3727+
3728+
3729+static DEVICE_ATTR(file, 0444, show_file, store_file);
3730+
3731+/*-------------------------------------------------------------------------*/
3732+
3733+static void fsg_release(struct kref *ref)
3734+{
3735+ struct fsg_dev *fsg = container_of(ref, struct fsg_dev, ref);
3736+
3737+ kfree(fsg->luns);
3738+ kfree(fsg);
3739+}
3740+
3741+static void lun_release(struct device *dev)
3742+{
3743+ struct fsg_dev *fsg = dev_get_drvdata(dev);
3744+
3745+ kref_put(&fsg->ref, fsg_release);
3746+}
3747+
3748+
3749+/*-------------------------------------------------------------------------*/
3750+
3751+static int __init fsg_alloc(void)
3752+{
3753+ struct fsg_dev *fsg;
3754+
3755+ fsg = kzalloc(sizeof *fsg, GFP_KERNEL);
3756+ if (!fsg)
3757+ return -ENOMEM;
3758+ spin_lock_init(&fsg->lock);
3759+ init_rwsem(&fsg->filesem);
3760+ kref_init(&fsg->ref);
3761+ init_completion(&fsg->thread_notifier);
3762+
3763+ the_fsg = fsg;
3764+ return 0;
3765+}
3766+
3767+static ssize_t print_switch_name(struct switch_dev *sdev, char *buf)
3768+{
3769+ return sprintf(buf, "%s\n", DRIVER_NAME);
3770+}
3771+
3772+static ssize_t print_switch_state(struct switch_dev *sdev, char *buf)
3773+{
3774+ struct fsg_dev *fsg = container_of(sdev, struct fsg_dev, sdev);
3775+ return sprintf(buf, "%s\n", (fsg->config ? "online" : "offline"));
3776+}
3777+
3778+static void
3779+fsg_function_unbind(struct usb_configuration *c, struct usb_function *f)
3780+{
3781+ struct fsg_dev *fsg = func_to_dev(f);
3782+ int i;
3783+ struct lun *curlun;
3784+
3785+ DBG(fsg, "fsg_function_unbind\n");
3786+ clear_bit(REGISTERED, &fsg->atomic_bitflags);
3787+
3788+ /* Unregister the sysfs attribute files and the LUNs */
3789+ for (i = 0; i < fsg->nluns; ++i) {
3790+ curlun = &fsg->luns[i];
3791+ if (curlun->registered) {
3792+ device_remove_file(&curlun->dev, &dev_attr_file);
3793+ device_unregister(&curlun->dev);
3794+ curlun->registered = 0;
3795+ }
3796+ }
3797+
3798+ /* If the thread isn't already dead, tell it to exit now */
3799+ if (fsg->state != FSG_STATE_TERMINATED) {
3800+ raise_exception(fsg, FSG_STATE_EXIT);
3801+ wait_for_completion(&fsg->thread_notifier);
3802+
3803+ /* The cleanup routine waits for this completion also */
3804+ complete(&fsg->thread_notifier);
3805+ }
3806+
3807+ /* Free the data buffers */
3808+ for (i = 0; i < NUM_BUFFERS; ++i)
3809+ kfree(fsg->buffhds[i].buf);
3810+}
3811+
3812+static int __init
3813+fsg_function_bind(struct usb_configuration *c, struct usb_function *f)
3814+{
3815+ struct usb_composite_dev *cdev = c->cdev;
3816+ struct fsg_dev *fsg = func_to_dev(f);
3817+ int rc;
3818+ int i;
3819+ int id;
3820+ struct lun *curlun;
3821+ struct usb_ep *ep;
3822+ char *pathbuf, *p;
3823+
3824+ fsg->cdev = cdev;
3825+ DBG(fsg, "fsg_function_bind\n");
3826+
3827+ dev_attr_file.attr.mode = 0644;
3828+
3829+ /* Find out how many LUNs there should be */
3830+ i = fsg->nluns;
3831+ if (i == 0)
3832+ i = 1;
3833+ if (i > MAX_LUNS) {
3834+ ERROR(fsg, "invalid number of LUNs: %d\n", i);
3835+ rc = -EINVAL;
3836+ goto out;
3837+ }
3838+
3839+ /* Create the LUNs, open their backing files, and register the
3840+ * LUN devices in sysfs. */
3841+ fsg->luns = kzalloc(i * sizeof(struct lun), GFP_KERNEL);
3842+ if (!fsg->luns) {
3843+ rc = -ENOMEM;
3844+ goto out;
3845+ }
3846+ fsg->nluns = i;
3847+
3848+ for (i = 0; i < fsg->nluns; ++i) {
3849+ curlun = &fsg->luns[i];
3850+ curlun->ro = 0;
3851+ curlun->dev.release = lun_release;
3852+ curlun->dev.parent = &cdev->gadget->dev;
3853+ dev_set_drvdata(&curlun->dev, fsg);
3854+ snprintf(curlun->dev.bus_id, BUS_ID_SIZE,
3855+ "lun%d", i);
3856+
3857+ rc = device_register(&curlun->dev);
3858+ if (rc != 0) {
3859+ INFO(fsg, "failed to register LUN%d: %d\n", i, rc);
3860+ goto out;
3861+ }
3862+ rc = device_create_file(&curlun->dev, &dev_attr_file);
3863+ if (rc != 0) {
3864+ ERROR(fsg, "device_create_file failed: %d\n", rc);
3865+ device_unregister(&curlun->dev);
3866+ goto out;
3867+ }
3868+ curlun->registered = 1;
3869+ kref_get(&fsg->ref);
3870+ }
3871+
3872+ /* allocate interface ID(s) */
3873+ id = usb_interface_id(c, f);
3874+ if (id < 0)
3875+ return id;
3876+ intf_desc.bInterfaceNumber = id;
3877+
3878+ ep = usb_ep_autoconfig(cdev->gadget, &fs_bulk_in_desc);
3879+ if (!ep)
3880+ goto autoconf_fail;
3881+ ep->driver_data = fsg; /* claim the endpoint */
3882+ fsg->bulk_in = ep;
3883+
3884+ ep = usb_ep_autoconfig(cdev->gadget, &fs_bulk_out_desc);
3885+ if (!ep)
3886+ goto autoconf_fail;
3887+ ep->driver_data = fsg; /* claim the endpoint */
3888+ fsg->bulk_out = ep;
3889+
3890+ rc = -ENOMEM;
3891+
3892+ if (gadget_is_dualspeed(cdev->gadget)) {
3893+ /* Assume endpoint addresses are the same for both speeds */
3894+ hs_bulk_in_desc.bEndpointAddress =
3895+ fs_bulk_in_desc.bEndpointAddress;
3896+ hs_bulk_out_desc.bEndpointAddress =
3897+ fs_bulk_out_desc.bEndpointAddress;
3898+
3899+ f->hs_descriptors = hs_function;
3900+ }
3901+
3902+ /* Allocate the data buffers */
3903+ for (i = 0; i < NUM_BUFFERS; ++i) {
3904+ struct fsg_buffhd *bh = &fsg->buffhds[i];
3905+
3906+ /* Allocate for the bulk-in endpoint. We assume that
3907+ * the buffer will also work with the bulk-out (and
3908+ * interrupt-in) endpoint. */
3909+ bh->buf = kmalloc(fsg->buf_size, GFP_KERNEL);
3910+ if (!bh->buf)
3911+ goto out;
3912+ bh->next = bh + 1;
3913+ }
3914+ fsg->buffhds[NUM_BUFFERS - 1].next = &fsg->buffhds[0];
3915+
3916+ fsg->thread_task = kthread_create(fsg_main_thread, fsg,
3917+ shortname);
3918+ if (IS_ERR(fsg->thread_task)) {
3919+ rc = PTR_ERR(fsg->thread_task);
3920+ ERROR(fsg, "kthread_create failed: %d\n", rc);
3921+ goto out;
3922+ }
3923+
3924+ INFO(fsg, "Number of LUNs=%d\n", fsg->nluns);
3925+
3926+ pathbuf = kmalloc(PATH_MAX, GFP_KERNEL);
3927+ for (i = 0; i < fsg->nluns; ++i) {
3928+ curlun = &fsg->luns[i];
3929+ if (backing_file_is_open(curlun)) {
3930+ p = NULL;
3931+ if (pathbuf) {
3932+ p = d_path(&curlun->filp->f_path,
3933+ pathbuf, PATH_MAX);
3934+ if (IS_ERR(p))
3935+ p = NULL;
3936+ }
3937+ LINFO(curlun, "ro=%d, file: %s\n",
3938+ curlun->ro, (p ? p : "(error)"));
3939+ }
3940+ }
3941+ kfree(pathbuf);
3942+
3943+ set_bit(REGISTERED, &fsg->atomic_bitflags);
3944+
3945+ /* Tell the thread to start working */
3946+ wake_up_process(fsg->thread_task);
3947+ return 0;
3948+
3949+autoconf_fail:
3950+ ERROR(fsg, "unable to autoconfigure all endpoints\n");
3951+ rc = -ENOTSUPP;
3952+
3953+out:
3954+ DBG(fsg, "fsg_function_bind failed: %d\n", rc);
3955+ fsg->state = FSG_STATE_TERMINATED; /* The thread is dead */
3956+ fsg_function_unbind(c, f);
3957+ close_all_backing_files(fsg);
3958+ return rc;
3959+}
3960+
3961+static int fsg_function_set_alt(struct usb_function *f,
3962+ unsigned intf, unsigned alt)
3963+{
3964+ struct fsg_dev *fsg = func_to_dev(f);
3965+ DBG(fsg, "fsg_function_set_alt intf: %d alt: %d\n", intf, alt);
3966+ fsg->new_config = 1;
3967+ raise_exception(fsg, FSG_STATE_CONFIG_CHANGE);
3968+ return 0;
3969+}
3970+
3971+static void fsg_function_disable(struct usb_function *f)
3972+{
3973+ struct fsg_dev *fsg = func_to_dev(f);
3974+ DBG(fsg, "fsg_function_disable\n");
3975+ fsg->new_config = 0;
3976+ raise_exception(fsg, FSG_STATE_CONFIG_CHANGE);
3977+}
3978+
3979+int __init mass_storage_function_add(struct usb_composite_dev *cdev,
3980+ struct usb_configuration *c, int nluns)
3981+{
3982+ int rc;
3983+ struct fsg_dev *fsg;
3984+
3985+ printk(KERN_INFO "mass_storage_function_add\n");
3986+ rc = fsg_alloc();
3987+ if (rc)
3988+ return rc;
3989+ fsg = the_fsg;
3990+ fsg->nluns = nluns;
3991+
3992+ spin_lock_init(&fsg->lock);
3993+ init_rwsem(&fsg->filesem);
3994+ kref_init(&fsg->ref);
3995+ init_completion(&fsg->thread_notifier);
3996+
3997+ the_fsg->buf_size = BULK_BUFFER_SIZE;
3998+ the_fsg->sdev.name = DRIVER_NAME;
3999+ the_fsg->sdev.print_name = print_switch_name;
4000+ the_fsg->sdev.print_state = print_switch_state;
4001+ rc = switch_dev_register(&the_fsg->sdev);
4002+ if (rc < 0)
4003+ goto err_switch_dev_register;
4004+
4005+ wake_lock_init(&the_fsg->wake_lock, WAKE_LOCK_SUSPEND,
4006+ "usb_mass_storage");
4007+
4008+ fsg->cdev = cdev;
4009+ fsg->function.name = shortname;
4010+ fsg->function.descriptors = fs_function;
4011+ fsg->function.bind = fsg_function_bind;
4012+ fsg->function.unbind = fsg_function_unbind;
4013+ fsg->function.setup = fsg_function_setup;
4014+ fsg->function.set_alt = fsg_function_set_alt;
4015+ fsg->function.disable = fsg_function_disable;
4016+
4017+ rc = usb_add_function(c, &fsg->function);
4018+ if (rc != 0)
4019+ goto err_usb_add_function;
4020+
4021+ return 0;
4022+
4023+err_usb_add_function:
4024+ switch_dev_unregister(&the_fsg->sdev);
4025+err_switch_dev_register:
4026+ kref_put(&the_fsg->ref, fsg_release);
4027+
4028+ return rc;
4029+}
4030--- /dev/null
4031+++ b/drivers/usb/gadget/f_mass_storage.h
4032@@ -0,0 +1,52 @@
4033+/*
4034+ * drivers/usb/gadget/f_mass_storage.h
4035+ *
4036+ * Function Driver for USB Mass Storage
4037+ *
4038+ * Copyright (C) 2008 Google, Inc.
4039+ * Author: Mike Lockwood <lockwood@android.com>
4040+ *
4041+ * Based heavily on the file_storage gadget driver in
4042+ * drivers/usb/gadget/file_storage.c and licensed under the same terms:
4043+ *
4044+ * Copyright (C) 2003-2007 Alan Stern
4045+ * All rights reserved.
4046+ *
4047+ * Redistribution and use in source and binary forms, with or without
4048+ * modification, are permitted provided that the following conditions
4049+ * are met:
4050+ * 1. Redistributions of source code must retain the above copyright
4051+ * notice, this list of conditions, and the following disclaimer,
4052+ * without modification.
4053+ * 2. Redistributions in binary form must reproduce the above copyright
4054+ * notice, this list of conditions and the following disclaimer in the
4055+ * documentation and/or other materials provided with the distribution.
4056+ * 3. The names of the above-listed copyright holders may not be used
4057+ * to endorse or promote products derived from this software without
4058+ * specific prior written permission.
4059+ *
4060+ * ALTERNATIVELY, this software may be distributed under the terms of the
4061+ * GNU General Public License ("GPL") as published by the Free Software
4062+ * Foundation, either version 2 of that License or (at your option) any
4063+ * later version.
4064+ *
4065+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
4066+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
4067+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
4068+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
4069+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
4070+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
4071+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
4072+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
4073+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
4074+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
4075+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
4076+ */
4077+
4078+#ifndef __F_MASS_STORAGE_H
4079+#define __F_MASS_STORAGE_H
4080+
4081+int mass_storage_function_add(struct usb_composite_dev *cdev,
4082+ struct usb_configuration *c, int nluns);
4083+
4084+#endif /* __F_MASS_STORAGE_H */
4085--- /dev/null
4086+++ b/include/linux/usb/android.h
4087@@ -0,0 +1,40 @@
4088+/*
4089+ * Platform data for Android USB
4090+ *
4091+ * Copyright (C) 2008 Google, Inc.
4092+ * Author: Mike Lockwood <lockwood@android.com>
4093+ *
4094+ * This software is licensed under the terms of the GNU General Public
4095+ * License version 2, as published by the Free Software Foundation, and
4096+ * may be copied, distributed, and modified under those terms.
4097+ *
4098+ * This program is distributed in the hope that it will be useful,
4099+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
4100+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
4101+ * GNU General Public License for more details.
4102+ *
4103+ */
4104+#ifndef __LINUX_USB_ANDROID_H
4105+#define __LINUX_USB_ANDROID_H
4106+
4107+struct android_usb_platform_data {
4108+ /* USB device descriptor fields */
4109+ __u16 vendor_id;
4110+
4111+ /* Default product ID. */
4112+ __u16 product_id;
4113+
4114+ /* Product ID when adb is enabled. */
4115+ __u16 adb_product_id;
4116+
4117+ __u16 version;
4118+
4119+ char *product_name;
4120+ char *manufacturer_name;
4121+ char *serial_number;
4122+
4123+ /* number of LUNS for mass storage function */
4124+ int nluns;
4125+};
4126+
4127+#endif /* __LINUX_USB_ANDROID_H */
4128

Archive Download this file

Branches:
backfire
history
master
release_2010-11-17
release_2010-12-14
release_2011-02-23
release_2011-05-28
release_2011-08-27
release_2011-11-13
release_2012-03-18
release_2012-04-09
release_2012-10-11
uclibc_nptl



interactive