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