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1 | #include <linux/module.h> |
2 | #include <linux/types.h> |
3 | #include <linux/string.h> |
4 | #include <linux/kernel.h> |
5 | #include <linux/errno.h> |
6 | #include <linux/genhd.h> |
7 | #include <linux/mutex.h> |
8 | #include <linux/ide.h> |
9 | #include <linux/hdreg.h> |
10 | #include <linux/dmi.h> |
11 | #include <linux/slab.h> |
12 | |
13 | #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT) |
14 | #define IDE_DISK_MINORS (1 << PARTN_BITS) |
15 | #else |
16 | #define IDE_DISK_MINORS 0 |
17 | #endif |
18 | |
19 | #include "ide-disk.h" |
20 | #include "ide-floppy.h" |
21 | |
22 | #define IDE_GD_VERSION "1.18" |
23 | |
24 | /* module parameters */ |
25 | static unsigned long debug_mask; |
26 | module_param(debug_mask, ulong, 0644); |
27 | |
28 | static DEFINE_MUTEX(ide_disk_ref_mutex); |
29 | |
30 | static void ide_disk_release(struct device *); |
31 | |
32 | static struct ide_disk_obj *ide_disk_get(struct gendisk *disk) |
33 | { |
34 | struct ide_disk_obj *idkp = NULL; |
35 | |
36 | mutex_lock(&ide_disk_ref_mutex); |
37 | idkp = ide_drv_g(disk, ide_disk_obj); |
38 | if (idkp) { |
39 | if (ide_device_get(idkp->drive)) |
40 | idkp = NULL; |
41 | else |
42 | get_device(&idkp->dev); |
43 | } |
44 | mutex_unlock(&ide_disk_ref_mutex); |
45 | return idkp; |
46 | } |
47 | |
48 | static void ide_disk_put(struct ide_disk_obj *idkp) |
49 | { |
50 | ide_drive_t *drive = idkp->drive; |
51 | |
52 | mutex_lock(&ide_disk_ref_mutex); |
53 | put_device(&idkp->dev); |
54 | ide_device_put(drive); |
55 | mutex_unlock(&ide_disk_ref_mutex); |
56 | } |
57 | |
58 | sector_t ide_gd_capacity(ide_drive_t *drive) |
59 | { |
60 | return drive->capacity64; |
61 | } |
62 | |
63 | static int ide_gd_probe(ide_drive_t *); |
64 | |
65 | static void ide_gd_remove(ide_drive_t *drive) |
66 | { |
67 | struct ide_disk_obj *idkp = drive->driver_data; |
68 | struct gendisk *g = idkp->disk; |
69 | |
70 | ide_proc_unregister_driver(drive, idkp->driver); |
71 | device_del(&idkp->dev); |
72 | del_gendisk(g); |
73 | drive->disk_ops->flush(drive); |
74 | |
75 | mutex_lock(&ide_disk_ref_mutex); |
76 | put_device(&idkp->dev); |
77 | mutex_unlock(&ide_disk_ref_mutex); |
78 | } |
79 | |
80 | static void ide_disk_release(struct device *dev) |
81 | { |
82 | struct ide_disk_obj *idkp = to_ide_drv(dev, ide_disk_obj); |
83 | ide_drive_t *drive = idkp->drive; |
84 | struct gendisk *g = idkp->disk; |
85 | |
86 | drive->disk_ops = NULL; |
87 | drive->driver_data = NULL; |
88 | g->private_data = NULL; |
89 | put_disk(g); |
90 | kfree(idkp); |
91 | } |
92 | |
93 | /* |
94 | * On HPA drives the capacity needs to be |
95 | * reinitilized on resume otherwise the disk |
96 | * can not be used and a hard reset is required |
97 | */ |
98 | static void ide_gd_resume(ide_drive_t *drive) |
99 | { |
100 | if (ata_id_hpa_enabled(drive->id)) |
101 | (void)drive->disk_ops->get_capacity(drive); |
102 | } |
103 | |
104 | static const struct dmi_system_id ide_coldreboot_table[] = { |
105 | { |
106 | /* Acer TravelMate 66x cuts power during reboot */ |
107 | .ident = "Acer TravelMate 660", |
108 | .matches = { |
109 | DMI_MATCH(DMI_SYS_VENDOR, "Acer"), |
110 | DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 660"), |
111 | }, |
112 | }, |
113 | |
114 | { } /* terminate list */ |
115 | }; |
116 | |
117 | static void ide_gd_shutdown(ide_drive_t *drive) |
118 | { |
119 | #ifdef CONFIG_ALPHA |
120 | /* On Alpha, halt(8) doesn't actually turn the machine off, |
121 | it puts you into the sort of firmware monitor. Typically, |
122 | it's used to boot another kernel image, so it's not much |
123 | different from reboot(8). Therefore, we don't need to |
124 | spin down the disk in this case, especially since Alpha |
125 | firmware doesn't handle disks in standby mode properly. |
126 | On the other hand, it's reasonably safe to turn the power |
127 | off when the shutdown process reaches the firmware prompt, |
128 | as the firmware initialization takes rather long time - |
129 | at least 10 seconds, which should be sufficient for |
130 | the disk to expire its write cache. */ |
131 | if (system_state != SYSTEM_POWER_OFF) { |
132 | #else |
133 | if (system_state == SYSTEM_RESTART && |
134 | !dmi_check_system(ide_coldreboot_table)) { |
135 | #endif |
136 | drive->disk_ops->flush(drive); |
137 | return; |
138 | } |
139 | |
140 | printk(KERN_INFO "Shutdown: %s\n", drive->name); |
141 | |
142 | drive->gendev.bus->suspend(&drive->gendev, PMSG_SUSPEND); |
143 | } |
144 | |
145 | #ifdef CONFIG_IDE_PROC_FS |
146 | static ide_proc_entry_t *ide_disk_proc_entries(ide_drive_t *drive) |
147 | { |
148 | return (drive->media == ide_disk) ? ide_disk_proc : ide_floppy_proc; |
149 | } |
150 | |
151 | static const struct ide_proc_devset *ide_disk_proc_devsets(ide_drive_t *drive) |
152 | { |
153 | return (drive->media == ide_disk) ? ide_disk_settings |
154 | : ide_floppy_settings; |
155 | } |
156 | #endif |
157 | |
158 | static ide_startstop_t ide_gd_do_request(ide_drive_t *drive, |
159 | struct request *rq, sector_t sector) |
160 | { |
161 | return drive->disk_ops->do_request(drive, rq, sector); |
162 | } |
163 | |
164 | static struct ide_driver ide_gd_driver = { |
165 | .gen_driver = { |
166 | .owner = THIS_MODULE, |
167 | .name = "ide-gd", |
168 | .bus = &ide_bus_type, |
169 | }, |
170 | .probe = ide_gd_probe, |
171 | .remove = ide_gd_remove, |
172 | .resume = ide_gd_resume, |
173 | .shutdown = ide_gd_shutdown, |
174 | .version = IDE_GD_VERSION, |
175 | .do_request = ide_gd_do_request, |
176 | #ifdef CONFIG_IDE_PROC_FS |
177 | .proc_entries = ide_disk_proc_entries, |
178 | .proc_devsets = ide_disk_proc_devsets, |
179 | #endif |
180 | }; |
181 | |
182 | static int ide_gd_open(struct block_device *bdev, fmode_t mode) |
183 | { |
184 | struct gendisk *disk = bdev->bd_disk; |
185 | struct ide_disk_obj *idkp; |
186 | ide_drive_t *drive; |
187 | int ret = 0; |
188 | |
189 | idkp = ide_disk_get(disk); |
190 | if (idkp == NULL) |
191 | return -ENXIO; |
192 | |
193 | drive = idkp->drive; |
194 | |
195 | ide_debug_log(IDE_DBG_FUNC, "enter"); |
196 | |
197 | idkp->openers++; |
198 | |
199 | if ((drive->dev_flags & IDE_DFLAG_REMOVABLE) && idkp->openers == 1) { |
200 | drive->dev_flags &= ~IDE_DFLAG_FORMAT_IN_PROGRESS; |
201 | /* Just in case */ |
202 | |
203 | ret = drive->disk_ops->init_media(drive, disk); |
204 | |
205 | /* |
206 | * Allow O_NDELAY to open a drive without a disk, or with an |
207 | * unreadable disk, so that we can get the format capacity |
208 | * of the drive or begin the format - Sam |
209 | */ |
210 | if (ret && (mode & FMODE_NDELAY) == 0) { |
211 | ret = -EIO; |
212 | goto out_put_idkp; |
213 | } |
214 | |
215 | if ((drive->dev_flags & IDE_DFLAG_WP) && (mode & FMODE_WRITE)) { |
216 | ret = -EROFS; |
217 | goto out_put_idkp; |
218 | } |
219 | |
220 | /* |
221 | * Ignore the return code from door_lock, |
222 | * since the open() has already succeeded, |
223 | * and the door_lock is irrelevant at this point. |
224 | */ |
225 | drive->disk_ops->set_doorlock(drive, disk, 1); |
226 | drive->dev_flags |= IDE_DFLAG_MEDIA_CHANGED; |
227 | check_disk_change(bdev); |
228 | } else if (drive->dev_flags & IDE_DFLAG_FORMAT_IN_PROGRESS) { |
229 | ret = -EBUSY; |
230 | goto out_put_idkp; |
231 | } |
232 | return 0; |
233 | |
234 | out_put_idkp: |
235 | idkp->openers--; |
236 | ide_disk_put(idkp); |
237 | return ret; |
238 | } |
239 | |
240 | static int ide_gd_release(struct gendisk *disk, fmode_t mode) |
241 | { |
242 | struct ide_disk_obj *idkp = ide_drv_g(disk, ide_disk_obj); |
243 | ide_drive_t *drive = idkp->drive; |
244 | |
245 | ide_debug_log(IDE_DBG_FUNC, "enter"); |
246 | |
247 | if (idkp->openers == 1) |
248 | drive->disk_ops->flush(drive); |
249 | |
250 | if ((drive->dev_flags & IDE_DFLAG_REMOVABLE) && idkp->openers == 1) { |
251 | drive->disk_ops->set_doorlock(drive, disk, 0); |
252 | drive->dev_flags &= ~IDE_DFLAG_FORMAT_IN_PROGRESS; |
253 | } |
254 | |
255 | idkp->openers--; |
256 | |
257 | ide_disk_put(idkp); |
258 | |
259 | return 0; |
260 | } |
261 | |
262 | static int ide_gd_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
263 | { |
264 | struct ide_disk_obj *idkp = ide_drv_g(bdev->bd_disk, ide_disk_obj); |
265 | ide_drive_t *drive = idkp->drive; |
266 | |
267 | geo->heads = drive->bios_head; |
268 | geo->sectors = drive->bios_sect; |
269 | geo->cylinders = (u16)drive->bios_cyl; /* truncate */ |
270 | return 0; |
271 | } |
272 | |
273 | static int ide_gd_media_changed(struct gendisk *disk) |
274 | { |
275 | struct ide_disk_obj *idkp = ide_drv_g(disk, ide_disk_obj); |
276 | ide_drive_t *drive = idkp->drive; |
277 | int ret; |
278 | |
279 | /* do not scan partitions twice if this is a removable device */ |
280 | if (drive->dev_flags & IDE_DFLAG_ATTACH) { |
281 | drive->dev_flags &= ~IDE_DFLAG_ATTACH; |
282 | return 0; |
283 | } |
284 | |
285 | ret = !!(drive->dev_flags & IDE_DFLAG_MEDIA_CHANGED); |
286 | drive->dev_flags &= ~IDE_DFLAG_MEDIA_CHANGED; |
287 | |
288 | return ret; |
289 | } |
290 | |
291 | static unsigned long long ide_gd_set_capacity(struct gendisk *disk, |
292 | unsigned long long capacity) |
293 | { |
294 | struct ide_disk_obj *idkp = ide_drv_g(disk, ide_disk_obj); |
295 | ide_drive_t *drive = idkp->drive; |
296 | const struct ide_disk_ops *disk_ops = drive->disk_ops; |
297 | |
298 | if (disk_ops->set_capacity) |
299 | return disk_ops->set_capacity(drive, capacity); |
300 | |
301 | return drive->capacity64; |
302 | } |
303 | |
304 | static int ide_gd_revalidate_disk(struct gendisk *disk) |
305 | { |
306 | struct ide_disk_obj *idkp = ide_drv_g(disk, ide_disk_obj); |
307 | ide_drive_t *drive = idkp->drive; |
308 | |
309 | if (ide_gd_media_changed(disk)) |
310 | drive->disk_ops->get_capacity(drive); |
311 | |
312 | set_capacity(disk, ide_gd_capacity(drive)); |
313 | return 0; |
314 | } |
315 | |
316 | static int ide_gd_ioctl(struct block_device *bdev, fmode_t mode, |
317 | unsigned int cmd, unsigned long arg) |
318 | { |
319 | struct ide_disk_obj *idkp = ide_drv_g(bdev->bd_disk, ide_disk_obj); |
320 | ide_drive_t *drive = idkp->drive; |
321 | |
322 | return drive->disk_ops->ioctl(drive, bdev, mode, cmd, arg); |
323 | } |
324 | |
325 | static const struct block_device_operations ide_gd_ops = { |
326 | .owner = THIS_MODULE, |
327 | .open = ide_gd_open, |
328 | .release = ide_gd_release, |
329 | .locked_ioctl = ide_gd_ioctl, |
330 | .getgeo = ide_gd_getgeo, |
331 | .media_changed = ide_gd_media_changed, |
332 | .set_capacity = ide_gd_set_capacity, |
333 | .revalidate_disk = ide_gd_revalidate_disk |
334 | }; |
335 | |
336 | static int ide_gd_probe(ide_drive_t *drive) |
337 | { |
338 | const struct ide_disk_ops *disk_ops = NULL; |
339 | struct ide_disk_obj *idkp; |
340 | struct gendisk *g; |
341 | |
342 | /* strstr("foo", "") is non-NULL */ |
343 | if (!strstr("ide-gd", drive->driver_req)) |
344 | goto failed; |
345 | |
346 | #ifdef CONFIG_IDE_GD_ATA |
347 | if (drive->media == ide_disk) |
348 | disk_ops = &ide_ata_disk_ops; |
349 | #endif |
350 | #ifdef CONFIG_IDE_GD_ATAPI |
351 | if (drive->media == ide_floppy) |
352 | disk_ops = &ide_atapi_disk_ops; |
353 | #endif |
354 | if (disk_ops == NULL) |
355 | goto failed; |
356 | |
357 | if (disk_ops->check(drive, DRV_NAME) == 0) { |
358 | printk(KERN_ERR PFX "%s: not supported by this driver\n", |
359 | drive->name); |
360 | goto failed; |
361 | } |
362 | |
363 | idkp = kzalloc(sizeof(*idkp), GFP_KERNEL); |
364 | if (!idkp) { |
365 | printk(KERN_ERR PFX "%s: can't allocate a disk structure\n", |
366 | drive->name); |
367 | goto failed; |
368 | } |
369 | |
370 | g = alloc_disk_node(IDE_DISK_MINORS, hwif_to_node(drive->hwif)); |
371 | if (!g) |
372 | goto out_free_idkp; |
373 | |
374 | ide_init_disk(g, drive); |
375 | |
376 | idkp->dev.parent = &drive->gendev; |
377 | idkp->dev.release = ide_disk_release; |
378 | dev_set_name(&idkp->dev, dev_name(&drive->gendev)); |
379 | |
380 | if (device_register(&idkp->dev)) |
381 | goto out_free_disk; |
382 | |
383 | idkp->drive = drive; |
384 | idkp->driver = &ide_gd_driver; |
385 | idkp->disk = g; |
386 | |
387 | g->private_data = &idkp->driver; |
388 | |
389 | drive->driver_data = idkp; |
390 | drive->debug_mask = debug_mask; |
391 | drive->disk_ops = disk_ops; |
392 | |
393 | disk_ops->setup(drive); |
394 | |
395 | set_capacity(g, ide_gd_capacity(drive)); |
396 | |
397 | g->minors = IDE_DISK_MINORS; |
398 | g->driverfs_dev = &drive->gendev; |
399 | g->flags |= GENHD_FL_EXT_DEVT; |
400 | if (drive->dev_flags & IDE_DFLAG_REMOVABLE) |
401 | g->flags = GENHD_FL_REMOVABLE; |
402 | g->fops = &ide_gd_ops; |
403 | add_disk(g); |
404 | return 0; |
405 | |
406 | out_free_disk: |
407 | put_disk(g); |
408 | out_free_idkp: |
409 | kfree(idkp); |
410 | failed: |
411 | return -ENODEV; |
412 | } |
413 | |
414 | static int __init ide_gd_init(void) |
415 | { |
416 | printk(KERN_INFO DRV_NAME " driver " IDE_GD_VERSION "\n"); |
417 | return driver_register(&ide_gd_driver.gen_driver); |
418 | } |
419 | |
420 | static void __exit ide_gd_exit(void) |
421 | { |
422 | driver_unregister(&ide_gd_driver.gen_driver); |
423 | } |
424 | |
425 | MODULE_ALIAS("ide:*m-disk*"); |
426 | MODULE_ALIAS("ide-disk"); |
427 | MODULE_ALIAS("ide:*m-floppy*"); |
428 | MODULE_ALIAS("ide-floppy"); |
429 | module_init(ide_gd_init); |
430 | module_exit(ide_gd_exit); |
431 | MODULE_LICENSE("GPL"); |
432 | MODULE_DESCRIPTION("generic ATA/ATAPI disk driver"); |
433 |
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