Root/drivers/staging/asus_oled/asus_oled.c

1/*
2 * Asus OLED USB driver
3 *
4 * Copyright (C) 2007,2008 Jakub Schmidtke (sjakub@gmail.com)
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc.,
19 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 *
22 *
23 * This module is based on usbled and asus-laptop modules.
24 *
25 *
26 * Asus OLED support is based on asusoled program taken from
27 * <http://lapsus.berlios.de/asus_oled.html>.
28 *
29 *
30 */
31
32#include <linux/kernel.h>
33#include <linux/errno.h>
34#include <linux/init.h>
35#include <linux/slab.h>
36#include <linux/module.h>
37#include <linux/usb.h>
38#include <linux/platform_device.h>
39#include <linux/ctype.h>
40
41#define ASUS_OLED_VERSION "0.04-dev"
42#define ASUS_OLED_NAME "asus-oled"
43#define ASUS_OLED_UNDERSCORE_NAME "asus_oled"
44
45#define ASUS_OLED_ERROR "Asus OLED Display Error: "
46
47#define ASUS_OLED_STATIC 's'
48#define ASUS_OLED_ROLL 'r'
49#define ASUS_OLED_FLASH 'f'
50
51#define ASUS_OLED_MAX_WIDTH 1792
52#define ASUS_OLED_DISP_HEIGHT 32
53#define ASUS_OLED_PACKET_BUF_SIZE 256
54
55#define USB_VENDOR_ID_ASUS 0x0b05
56#define USB_DEVICE_ID_ASUS_LCM 0x1726
57#define USB_DEVICE_ID_ASUS_LCM2 0x175b
58
59MODULE_AUTHOR("Jakub Schmidtke, sjakub@gmail.com");
60MODULE_DESCRIPTION("Asus OLED Driver v" ASUS_OLED_VERSION);
61MODULE_LICENSE("GPL");
62
63static struct class *oled_class;
64static int oled_num;
65
66static uint start_off;
67
68module_param(start_off, uint, 0644);
69
70MODULE_PARM_DESC(start_off,
71         "Set to 1 to switch off OLED display after it is attached");
72
73enum oled_pack_mode {
74    PACK_MODE_G1,
75    PACK_MODE_G50,
76    PACK_MODE_LAST
77};
78
79struct oled_dev_desc_str {
80    uint16_t idVendor;
81    uint16_t idProduct;
82    /* width of display */
83    uint16_t devWidth;
84    /* formula to be used while packing the picture */
85    enum oled_pack_mode packMode;
86    const char *devDesc;
87};
88
89/* table of devices that work with this driver */
90static const struct usb_device_id id_table[] = {
91    /* Asus G1/G2 (and variants)*/
92    { USB_DEVICE(USB_VENDOR_ID_ASUS, USB_DEVICE_ID_ASUS_LCM) },
93    /* Asus G50V (and possibly others - G70? G71?)*/
94    { USB_DEVICE(USB_VENDOR_ID_ASUS, USB_DEVICE_ID_ASUS_LCM2) },
95    { },
96};
97
98/* parameters of specific devices */
99static struct oled_dev_desc_str oled_dev_desc_table[] = {
100    { USB_VENDOR_ID_ASUS, USB_DEVICE_ID_ASUS_LCM, 128, PACK_MODE_G1,
101        "G1/G2" },
102    { USB_VENDOR_ID_ASUS, USB_DEVICE_ID_ASUS_LCM2, 256, PACK_MODE_G50,
103        "G50" },
104    { },
105};
106
107MODULE_DEVICE_TABLE(usb, id_table);
108
109struct asus_oled_header {
110    uint8_t magic1;
111    uint8_t magic2;
112    uint8_t flags;
113    uint8_t value3;
114    uint8_t buffer1;
115    uint8_t buffer2;
116    uint8_t value6;
117    uint8_t value7;
118    uint8_t value8;
119    uint8_t padding2[7];
120} __attribute((packed));
121
122struct asus_oled_packet {
123    struct asus_oled_header header;
124    uint8_t bitmap[ASUS_OLED_PACKET_BUF_SIZE];
125} __attribute((packed));
126
127struct asus_oled_dev {
128    struct usb_device *udev;
129    uint8_t pic_mode;
130    uint16_t dev_width;
131    enum oled_pack_mode pack_mode;
132    size_t height;
133    size_t width;
134    size_t x_shift;
135    size_t y_shift;
136    size_t buf_offs;
137    uint8_t last_val;
138    size_t buf_size;
139    char *buf;
140    uint8_t enabled;
141    struct device *dev;
142};
143
144static void setup_packet_header(struct asus_oled_packet *packet, char flags,
145             char value3, char buffer1, char buffer2, char value6,
146             char value7, char value8)
147{
148    memset(packet, 0, sizeof(struct asus_oled_header));
149    packet->header.magic1 = 0x55;
150    packet->header.magic2 = 0xaa;
151    packet->header.flags = flags;
152    packet->header.value3 = value3;
153    packet->header.buffer1 = buffer1;
154    packet->header.buffer2 = buffer2;
155    packet->header.value6 = value6;
156    packet->header.value7 = value7;
157    packet->header.value8 = value8;
158}
159
160static void enable_oled(struct asus_oled_dev *odev, uint8_t enabl)
161{
162    int retval;
163    int act_len;
164    struct asus_oled_packet *packet;
165
166    packet = kzalloc(sizeof(struct asus_oled_packet), GFP_KERNEL);
167
168    if (!packet) {
169        dev_err(&odev->udev->dev, "out of memory\n");
170        return;
171    }
172
173    setup_packet_header(packet, 0x20, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00);
174
175    if (enabl)
176        packet->bitmap[0] = 0xaf;
177    else
178        packet->bitmap[0] = 0xae;
179
180    retval = usb_bulk_msg(odev->udev,
181        usb_sndbulkpipe(odev->udev, 2),
182        packet,
183        sizeof(struct asus_oled_header) + 1,
184        &act_len,
185        -1);
186
187    if (retval)
188        dev_dbg(&odev->udev->dev, "retval = %d\n", retval);
189
190    odev->enabled = enabl;
191
192    kfree(packet);
193}
194
195static ssize_t set_enabled(struct device *dev, struct device_attribute *attr,
196               const char *buf, size_t count)
197{
198    struct usb_interface *intf = to_usb_interface(dev);
199    struct asus_oled_dev *odev = usb_get_intfdata(intf);
200    unsigned long value;
201    if (kstrtoul(buf, 10, &value))
202        return -EINVAL;
203
204    enable_oled(odev, value);
205
206    return count;
207}
208
209static ssize_t class_set_enabled(struct device *device,
210                 struct device_attribute *attr,
211                 const char *buf, size_t count)
212{
213    struct asus_oled_dev *odev =
214        (struct asus_oled_dev *) dev_get_drvdata(device);
215    unsigned long value;
216
217    if (kstrtoul(buf, 10, &value))
218        return -EINVAL;
219
220    enable_oled(odev, value);
221
222    return count;
223}
224
225static ssize_t get_enabled(struct device *dev, struct device_attribute *attr,
226               char *buf)
227{
228    struct usb_interface *intf = to_usb_interface(dev);
229    struct asus_oled_dev *odev = usb_get_intfdata(intf);
230
231    return sprintf(buf, "%d\n", odev->enabled);
232}
233
234static ssize_t class_get_enabled(struct device *device,
235                 struct device_attribute *attr, char *buf)
236{
237    struct asus_oled_dev *odev =
238        (struct asus_oled_dev *) dev_get_drvdata(device);
239
240    return sprintf(buf, "%d\n", odev->enabled);
241}
242
243static void send_packets(struct usb_device *udev,
244             struct asus_oled_packet *packet,
245             char *buf, uint8_t p_type, size_t p_num)
246{
247    size_t i;
248    int act_len;
249
250    for (i = 0; i < p_num; i++) {
251        int retval;
252
253        switch (p_type) {
254        case ASUS_OLED_ROLL:
255            setup_packet_header(packet, 0x40, 0x80, p_num,
256                        i + 1, 0x00, 0x01, 0xff);
257            break;
258        case ASUS_OLED_STATIC:
259            setup_packet_header(packet, 0x10 + i, 0x80, 0x01,
260                        0x01, 0x00, 0x01, 0x00);
261            break;
262        case ASUS_OLED_FLASH:
263            setup_packet_header(packet, 0x10 + i, 0x80, 0x01,
264                        0x01, 0x00, 0x00, 0xff);
265            break;
266        }
267
268        memcpy(packet->bitmap, buf + (ASUS_OLED_PACKET_BUF_SIZE*i),
269               ASUS_OLED_PACKET_BUF_SIZE);
270
271        retval = usb_bulk_msg(udev, usb_sndctrlpipe(udev, 2),
272                      packet, sizeof(struct asus_oled_packet),
273                      &act_len, -1);
274
275        if (retval)
276            dev_dbg(&udev->dev, "retval = %d\n", retval);
277    }
278}
279
280static void send_packet(struct usb_device *udev,
281            struct asus_oled_packet *packet,
282            size_t offset, size_t len, char *buf, uint8_t b1,
283            uint8_t b2, uint8_t b3, uint8_t b4, uint8_t b5,
284            uint8_t b6) {
285    int retval;
286    int act_len;
287
288    setup_packet_header(packet, b1, b2, b3, b4, b5, b6, 0x00);
289    memcpy(packet->bitmap, buf + offset, len);
290
291    retval = usb_bulk_msg(udev,
292                  usb_sndctrlpipe(udev, 2),
293                  packet,
294                  sizeof(struct asus_oled_packet),
295                  &act_len,
296                  -1);
297
298    if (retval)
299        dev_dbg(&udev->dev, "retval = %d\n", retval);
300}
301
302
303static void send_packets_g50(struct usb_device *udev,
304                 struct asus_oled_packet *packet, char *buf)
305{
306    send_packet(udev, packet, 0, 0x100, buf,
307            0x10, 0x00, 0x02, 0x01, 0x00, 0x01);
308    send_packet(udev, packet, 0x100, 0x080, buf,
309            0x10, 0x00, 0x02, 0x02, 0x80, 0x00);
310
311    send_packet(udev, packet, 0x180, 0x100, buf,
312            0x11, 0x00, 0x03, 0x01, 0x00, 0x01);
313    send_packet(udev, packet, 0x280, 0x100, buf,
314            0x11, 0x00, 0x03, 0x02, 0x00, 0x01);
315    send_packet(udev, packet, 0x380, 0x080, buf,
316            0x11, 0x00, 0x03, 0x03, 0x80, 0x00);
317}
318
319
320static void send_data(struct asus_oled_dev *odev)
321{
322    size_t packet_num = odev->buf_size / ASUS_OLED_PACKET_BUF_SIZE;
323    struct asus_oled_packet *packet;
324
325    packet = kzalloc(sizeof(struct asus_oled_packet), GFP_KERNEL);
326
327    if (!packet) {
328        dev_err(&odev->udev->dev, "out of memory\n");
329        return;
330    }
331
332    if (odev->pack_mode == PACK_MODE_G1) {
333        /* When sending roll-mode data the display updated only
334           first packet. I have no idea why, but when static picture
335           is sent just before rolling picture everything works fine. */
336        if (odev->pic_mode == ASUS_OLED_ROLL)
337            send_packets(odev->udev, packet, odev->buf,
338                     ASUS_OLED_STATIC, 2);
339
340        /* Only ROLL mode can use more than 2 packets.*/
341        if (odev->pic_mode != ASUS_OLED_ROLL && packet_num > 2)
342            packet_num = 2;
343
344        send_packets(odev->udev, packet, odev->buf,
345                 odev->pic_mode, packet_num);
346    } else if (odev->pack_mode == PACK_MODE_G50) {
347        send_packets_g50(odev->udev, packet, odev->buf);
348    }
349
350    kfree(packet);
351}
352
353static int append_values(struct asus_oled_dev *odev, uint8_t val, size_t count)
354{
355    odev->last_val = val;
356
357    if (val == 0) {
358        odev->buf_offs += count;
359        return 0;
360    }
361
362    while (count-- > 0) {
363        size_t x = odev->buf_offs % odev->width;
364        size_t y = odev->buf_offs / odev->width;
365        size_t i;
366
367        x += odev->x_shift;
368        y += odev->y_shift;
369
370        switch (odev->pack_mode) {
371        case PACK_MODE_G1:
372            /* i = (x/128)*640 + 127 - x + (y/8)*128;
373               This one for 128 is the same, but might be better
374               for different widths? */
375            i = (x/odev->dev_width)*640 +
376                odev->dev_width - 1 - x +
377                (y/8)*odev->dev_width;
378            break;
379
380        case PACK_MODE_G50:
381            i = (odev->dev_width - 1 - x)/8 + y*odev->dev_width/8;
382            break;
383
384        default:
385            i = 0;
386            printk(ASUS_OLED_ERROR "Unknown OLED Pack Mode: %d!\n",
387                   odev->pack_mode);
388            break;
389        }
390
391        if (i >= odev->buf_size) {
392            printk(ASUS_OLED_ERROR "Buffer overflow! Report a bug:"
393                   "offs: %d >= %d i: %d (x: %d y: %d)\n",
394                   (int) odev->buf_offs, (int) odev->buf_size,
395                   (int) i, (int) x, (int) y);
396            return -EIO;
397        }
398
399        switch (odev->pack_mode) {
400        case PACK_MODE_G1:
401            odev->buf[i] &= ~(1<<(y%8));
402            break;
403
404        case PACK_MODE_G50:
405            odev->buf[i] &= ~(1<<(x%8));
406            break;
407
408        default:
409            /* cannot get here; stops gcc complaining*/
410            ;
411        }
412
413        odev->buf_offs++;
414    }
415
416    return 0;
417}
418
419static ssize_t odev_set_picture(struct asus_oled_dev *odev,
420                const char *buf, size_t count)
421{
422    size_t offs = 0, max_offs;
423
424    if (count < 1)
425        return 0;
426
427    if (tolower(buf[0]) == 'b') {
428        /* binary mode, set the entire memory*/
429
430        size_t i;
431
432        odev->buf_size = (odev->dev_width * ASUS_OLED_DISP_HEIGHT) / 8;
433
434        kfree(odev->buf);
435        odev->buf = kmalloc(odev->buf_size, GFP_KERNEL);
436        if (odev->buf == NULL) {
437            odev->buf_size = 0;
438            printk(ASUS_OLED_ERROR "Out of memory!\n");
439            return -ENOMEM;
440        }
441
442        memset(odev->buf, 0xff, odev->buf_size);
443
444        for (i = 1; i < count && i <= 32 * 32; i++) {
445            odev->buf[i-1] = buf[i];
446            odev->buf_offs = i-1;
447        }
448
449        odev->width = odev->dev_width / 8;
450        odev->height = ASUS_OLED_DISP_HEIGHT;
451        odev->x_shift = 0;
452        odev->y_shift = 0;
453        odev->last_val = 0;
454
455        send_data(odev);
456
457        return count;
458    }
459
460    if (buf[0] == '<') {
461        size_t i;
462        size_t w = 0, h = 0;
463        size_t w_mem, h_mem;
464
465        if (count < 10 || buf[2] != ':')
466            goto error_header;
467
468
469        switch (tolower(buf[1])) {
470        case ASUS_OLED_STATIC:
471        case ASUS_OLED_ROLL:
472        case ASUS_OLED_FLASH:
473            odev->pic_mode = buf[1];
474            break;
475        default:
476            printk(ASUS_OLED_ERROR "Wrong picture mode: '%c'.\n",
477                   buf[1]);
478            return -EIO;
479            break;
480        }
481
482        for (i = 3; i < count; ++i) {
483            if (buf[i] >= '0' && buf[i] <= '9') {
484                w = 10*w + (buf[i] - '0');
485
486                if (w > ASUS_OLED_MAX_WIDTH)
487                    goto error_width;
488            } else if (tolower(buf[i]) == 'x') {
489                break;
490            } else {
491                goto error_width;
492            }
493        }
494
495        for (++i; i < count; ++i) {
496            if (buf[i] >= '0' && buf[i] <= '9') {
497                h = 10*h + (buf[i] - '0');
498
499                if (h > ASUS_OLED_DISP_HEIGHT)
500                    goto error_height;
501            } else if (tolower(buf[i]) == '>') {
502                break;
503            } else {
504                goto error_height;
505            }
506        }
507
508        if (w < 1 || w > ASUS_OLED_MAX_WIDTH)
509            goto error_width;
510
511        if (h < 1 || h > ASUS_OLED_DISP_HEIGHT)
512            goto error_height;
513
514        if (i >= count || buf[i] != '>')
515            goto error_header;
516
517        offs = i+1;
518
519        if (w % (odev->dev_width) != 0)
520            w_mem = (w/(odev->dev_width) + 1)*(odev->dev_width);
521        else
522            w_mem = w;
523
524        if (h < ASUS_OLED_DISP_HEIGHT)
525            h_mem = ASUS_OLED_DISP_HEIGHT;
526        else
527            h_mem = h;
528
529        odev->buf_size = w_mem * h_mem / 8;
530
531        kfree(odev->buf);
532        odev->buf = kmalloc(odev->buf_size, GFP_KERNEL);
533
534        if (odev->buf == NULL) {
535            odev->buf_size = 0;
536            printk(ASUS_OLED_ERROR "Out of memory!\n");
537            return -ENOMEM;
538        }
539
540        memset(odev->buf, 0xff, odev->buf_size);
541
542        odev->buf_offs = 0;
543        odev->width = w;
544        odev->height = h;
545        odev->x_shift = 0;
546        odev->y_shift = 0;
547        odev->last_val = 0;
548
549        if (odev->pic_mode == ASUS_OLED_FLASH) {
550            if (h < ASUS_OLED_DISP_HEIGHT/2)
551                odev->y_shift = (ASUS_OLED_DISP_HEIGHT/2 - h)/2;
552        } else {
553            if (h < ASUS_OLED_DISP_HEIGHT)
554                odev->y_shift = (ASUS_OLED_DISP_HEIGHT - h)/2;
555        }
556
557        if (w < (odev->dev_width))
558            odev->x_shift = ((odev->dev_width) - w)/2;
559    }
560
561    max_offs = odev->width * odev->height;
562
563    while (offs < count && odev->buf_offs < max_offs) {
564        int ret = 0;
565
566        if (buf[offs] == '1' || buf[offs] == '#') {
567            ret = append_values(odev, 1, 1);
568            if (ret < 0)
569                return ret;
570        } else if (buf[offs] == '0' || buf[offs] == ' ') {
571            ret = append_values(odev, 0, 1);
572            if (ret < 0)
573                return ret;
574        } else if (buf[offs] == '\n') {
575            /* New line detected. Lets assume, that all characters
576               till the end of the line were equal to the last
577               character in this line.*/
578            if (odev->buf_offs % odev->width != 0)
579                ret = append_values(odev, odev->last_val,
580                            odev->width -
581                            (odev->buf_offs %
582                             odev->width));
583            if (ret < 0)
584                return ret;
585        }
586
587        offs++;
588    }
589
590    if (odev->buf_offs >= max_offs)
591        send_data(odev);
592
593    return count;
594
595error_width:
596    printk(ASUS_OLED_ERROR "Wrong picture width specified.\n");
597    return -EIO;
598
599error_height:
600    printk(ASUS_OLED_ERROR "Wrong picture height specified.\n");
601    return -EIO;
602
603error_header:
604    printk(ASUS_OLED_ERROR "Wrong picture header.\n");
605    return -EIO;
606}
607
608static ssize_t set_picture(struct device *dev, struct device_attribute *attr,
609               const char *buf, size_t count)
610{
611    struct usb_interface *intf = to_usb_interface(dev);
612
613    return odev_set_picture(usb_get_intfdata(intf), buf, count);
614}
615
616static ssize_t class_set_picture(struct device *device,
617                 struct device_attribute *attr,
618                 const char *buf, size_t count)
619{
620    return odev_set_picture((struct asus_oled_dev *)
621                dev_get_drvdata(device), buf, count);
622}
623
624#define ASUS_OLED_DEVICE_ATTR(_file) dev_attr_asus_oled_##_file
625
626static DEVICE_ATTR(asus_oled_enabled, S_IWUSR | S_IRUGO,
627           get_enabled, set_enabled);
628static DEVICE_ATTR(asus_oled_picture, S_IWUSR , NULL, set_picture);
629
630static DEVICE_ATTR(enabled, S_IWUSR | S_IRUGO,
631           class_get_enabled, class_set_enabled);
632static DEVICE_ATTR(picture, S_IWUSR, NULL, class_set_picture);
633
634static int asus_oled_probe(struct usb_interface *interface,
635               const struct usb_device_id *id)
636{
637    struct usb_device *udev = interface_to_usbdev(interface);
638    struct asus_oled_dev *odev = NULL;
639    int retval = -ENOMEM;
640    uint16_t dev_width = 0;
641    enum oled_pack_mode pack_mode = PACK_MODE_LAST;
642    const struct oled_dev_desc_str *dev_desc = oled_dev_desc_table;
643    const char *desc = NULL;
644
645    if (!id) {
646        /* Even possible? Just to make sure...*/
647        dev_err(&interface->dev, "No usb_device_id provided!\n");
648        return -ENODEV;
649    }
650
651    for (; dev_desc->idVendor; dev_desc++) {
652        if (dev_desc->idVendor == id->idVendor
653            && dev_desc->idProduct == id->idProduct) {
654            dev_width = dev_desc->devWidth;
655            desc = dev_desc->devDesc;
656            pack_mode = dev_desc->packMode;
657            break;
658        }
659    }
660
661    if (!desc || dev_width < 1 || pack_mode == PACK_MODE_LAST) {
662        dev_err(&interface->dev,
663            "Missing or incomplete device description!\n");
664        return -ENODEV;
665    }
666
667    odev = kzalloc(sizeof(struct asus_oled_dev), GFP_KERNEL);
668
669    if (odev == NULL) {
670        dev_err(&interface->dev, "Out of memory\n");
671        return -ENOMEM;
672    }
673
674    odev->udev = usb_get_dev(udev);
675    odev->pic_mode = ASUS_OLED_STATIC;
676    odev->dev_width = dev_width;
677    odev->pack_mode = pack_mode;
678    odev->height = 0;
679    odev->width = 0;
680    odev->x_shift = 0;
681    odev->y_shift = 0;
682    odev->buf_offs = 0;
683    odev->buf_size = 0;
684    odev->last_val = 0;
685    odev->buf = NULL;
686    odev->enabled = 1;
687    odev->dev = NULL;
688
689    usb_set_intfdata(interface, odev);
690
691    retval = device_create_file(&interface->dev,
692                    &ASUS_OLED_DEVICE_ATTR(enabled));
693    if (retval)
694        goto err_files;
695
696    retval = device_create_file(&interface->dev,
697                    &ASUS_OLED_DEVICE_ATTR(picture));
698    if (retval)
699        goto err_files;
700
701    odev->dev = device_create(oled_class, &interface->dev, MKDEV(0, 0),
702                  NULL, "oled_%d", ++oled_num);
703
704    if (IS_ERR(odev->dev)) {
705        retval = PTR_ERR(odev->dev);
706        goto err_files;
707    }
708
709    dev_set_drvdata(odev->dev, odev);
710
711    retval = device_create_file(odev->dev, &dev_attr_enabled);
712    if (retval)
713        goto err_class_enabled;
714
715    retval = device_create_file(odev->dev, &dev_attr_picture);
716    if (retval)
717        goto err_class_picture;
718
719    dev_info(&interface->dev,
720         "Attached Asus OLED device: %s [width %u, pack_mode %d]\n",
721         desc, odev->dev_width, odev->pack_mode);
722
723    if (start_off)
724        enable_oled(odev, 0);
725
726    return 0;
727
728err_class_picture:
729    device_remove_file(odev->dev, &dev_attr_picture);
730
731err_class_enabled:
732    device_remove_file(odev->dev, &dev_attr_enabled);
733    device_unregister(odev->dev);
734
735err_files:
736    device_remove_file(&interface->dev, &ASUS_OLED_DEVICE_ATTR(enabled));
737    device_remove_file(&interface->dev, &ASUS_OLED_DEVICE_ATTR(picture));
738
739    usb_set_intfdata(interface, NULL);
740    usb_put_dev(odev->udev);
741    kfree(odev);
742
743    return retval;
744}
745
746static void asus_oled_disconnect(struct usb_interface *interface)
747{
748    struct asus_oled_dev *odev;
749
750    odev = usb_get_intfdata(interface);
751    usb_set_intfdata(interface, NULL);
752
753    device_remove_file(odev->dev, &dev_attr_picture);
754    device_remove_file(odev->dev, &dev_attr_enabled);
755    device_unregister(odev->dev);
756
757    device_remove_file(&interface->dev, &ASUS_OLED_DEVICE_ATTR(picture));
758    device_remove_file(&interface->dev, &ASUS_OLED_DEVICE_ATTR(enabled));
759
760    usb_put_dev(odev->udev);
761
762    kfree(odev->buf);
763
764    kfree(odev);
765
766    dev_info(&interface->dev, "Disconnected Asus OLED device\n");
767}
768
769static struct usb_driver oled_driver = {
770    .name = ASUS_OLED_NAME,
771    .probe = asus_oled_probe,
772    .disconnect = asus_oled_disconnect,
773    .id_table = id_table,
774};
775
776static CLASS_ATTR_STRING(version, S_IRUGO,
777            ASUS_OLED_UNDERSCORE_NAME " " ASUS_OLED_VERSION);
778
779static int __init asus_oled_init(void)
780{
781    int retval = 0;
782    oled_class = class_create(THIS_MODULE, ASUS_OLED_UNDERSCORE_NAME);
783
784    if (IS_ERR(oled_class)) {
785        pr_err("Error creating " ASUS_OLED_UNDERSCORE_NAME " class\n");
786        return PTR_ERR(oled_class);
787    }
788
789    retval = class_create_file(oled_class, &class_attr_version.attr);
790    if (retval) {
791        pr_err("Error creating class version file\n");
792        goto error;
793    }
794
795    retval = usb_register(&oled_driver);
796
797    if (retval) {
798        pr_err("usb_register failed. Error number %d\n", retval);
799        goto error;
800    }
801
802    return retval;
803
804error:
805    class_destroy(oled_class);
806    return retval;
807}
808
809static void __exit asus_oled_exit(void)
810{
811    usb_deregister(&oled_driver);
812    class_remove_file(oled_class, &class_attr_version.attr);
813    class_destroy(oled_class);
814}
815
816module_init(asus_oled_init);
817module_exit(asus_oled_exit);
818
819

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