Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * sr.c Copyright (C) 1992 David Giller | |
3 | * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale | |
4 | * | |
5 | * adapted from: | |
6 | * sd.c Copyright (C) 1992 Drew Eckhardt | |
7 | * Linux scsi disk driver by | |
8 | * Drew Eckhardt <drew@colorado.edu> | |
9 | * | |
10 | * Modified by Eric Youngdale ericy@andante.org to | |
11 | * add scatter-gather, multiple outstanding request, and other | |
12 | * enhancements. | |
13 | * | |
14 | * Modified by Eric Youngdale eric@andante.org to support loadable | |
15 | * low-level scsi drivers. | |
16 | * | |
17 | * Modified by Thomas Quinot thomas@melchior.cuivre.fdn.fr to | |
18 | * provide auto-eject. | |
19 | * | |
20 | * Modified by Gerd Knorr <kraxel@cs.tu-berlin.de> to support the | |
21 | * generic cdrom interface | |
22 | * | |
23 | * Modified by Jens Axboe <axboe@suse.de> - Uniform sr_packet() | |
24 | * interface, capabilities probe additions, ioctl cleanups, etc. | |
25 | * | |
26 | * Modified by Richard Gooch <rgooch@atnf.csiro.au> to support devfs | |
27 | * | |
28 | * Modified by Jens Axboe <axboe@suse.de> - support DVD-RAM | |
29 | * transparently and lose the GHOST hack | |
30 | * | |
31 | * Modified by Arnaldo Carvalho de Melo <acme@conectiva.com.br> | |
32 | * check resource allocation in sr_init and some cleanups | |
33 | */ | |
34 | ||
35 | #include <linux/module.h> | |
36 | #include <linux/fs.h> | |
37 | #include <linux/kernel.h> | |
1da177e4 LT |
38 | #include <linux/mm.h> |
39 | #include <linux/bio.h> | |
40 | #include <linux/string.h> | |
41 | #include <linux/errno.h> | |
42 | #include <linux/cdrom.h> | |
43 | #include <linux/interrupt.h> | |
44 | #include <linux/init.h> | |
45 | #include <linux/blkdev.h> | |
0b950672 | 46 | #include <linux/mutex.h> |
1da177e4 LT |
47 | #include <asm/uaccess.h> |
48 | ||
49 | #include <scsi/scsi.h> | |
50 | #include <scsi/scsi_dbg.h> | |
51 | #include <scsi/scsi_device.h> | |
52 | #include <scsi/scsi_driver.h> | |
820732b5 | 53 | #include <scsi/scsi_cmnd.h> |
1da177e4 LT |
54 | #include <scsi/scsi_eh.h> |
55 | #include <scsi/scsi_host.h> | |
56 | #include <scsi/scsi_ioctl.h> /* For the door lock/unlock commands */ | |
1da177e4 LT |
57 | |
58 | #include "scsi_logging.h" | |
59 | #include "sr.h" | |
60 | ||
61 | ||
f018fa55 RH |
62 | MODULE_DESCRIPTION("SCSI cdrom (sr) driver"); |
63 | MODULE_LICENSE("GPL"); | |
64 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_CDROM_MAJOR); | |
d7b8bcb0 MT |
65 | MODULE_ALIAS_SCSI_DEVICE(TYPE_ROM); |
66 | MODULE_ALIAS_SCSI_DEVICE(TYPE_WORM); | |
f018fa55 | 67 | |
1da177e4 LT |
68 | #define SR_DISKS 256 |
69 | ||
70 | #define MAX_RETRIES 3 | |
71 | #define SR_TIMEOUT (30 * HZ) | |
72 | #define SR_CAPABILITIES \ | |
73 | (CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|CDC_SELECT_SPEED| \ | |
74 | CDC_SELECT_DISC|CDC_MULTI_SESSION|CDC_MCN|CDC_MEDIA_CHANGED| \ | |
6a2900b6 | 75 | CDC_PLAY_AUDIO|CDC_RESET|CDC_DRIVE_STATUS| \ |
1da177e4 LT |
76 | CDC_CD_R|CDC_CD_RW|CDC_DVD|CDC_DVD_R|CDC_DVD_RAM|CDC_GENERIC_PACKET| \ |
77 | CDC_MRW|CDC_MRW_W|CDC_RAM) | |
78 | ||
79 | static int sr_probe(struct device *); | |
80 | static int sr_remove(struct device *); | |
1da177e4 LT |
81 | |
82 | static struct scsi_driver sr_template = { | |
83 | .owner = THIS_MODULE, | |
84 | .gendrv = { | |
85 | .name = "sr", | |
86 | .probe = sr_probe, | |
87 | .remove = sr_remove, | |
88 | }, | |
1da177e4 LT |
89 | }; |
90 | ||
91 | static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG]; | |
92 | static DEFINE_SPINLOCK(sr_index_lock); | |
93 | ||
94 | /* This semaphore is used to mediate the 0->1 reference get in the | |
95 | * face of object destruction (i.e. we can't allow a get on an | |
96 | * object after last put) */ | |
0b950672 | 97 | static DEFINE_MUTEX(sr_ref_mutex); |
1da177e4 LT |
98 | |
99 | static int sr_open(struct cdrom_device_info *, int); | |
100 | static void sr_release(struct cdrom_device_info *); | |
101 | ||
102 | static void get_sectorsize(struct scsi_cd *); | |
103 | static void get_capabilities(struct scsi_cd *); | |
104 | ||
105 | static int sr_media_change(struct cdrom_device_info *, int); | |
106 | static int sr_packet(struct cdrom_device_info *, struct packet_command *); | |
107 | ||
108 | static struct cdrom_device_ops sr_dops = { | |
109 | .open = sr_open, | |
110 | .release = sr_release, | |
111 | .drive_status = sr_drive_status, | |
112 | .media_changed = sr_media_change, | |
113 | .tray_move = sr_tray_move, | |
114 | .lock_door = sr_lock_door, | |
115 | .select_speed = sr_select_speed, | |
116 | .get_last_session = sr_get_last_session, | |
117 | .get_mcn = sr_get_mcn, | |
118 | .reset = sr_reset, | |
119 | .audio_ioctl = sr_audio_ioctl, | |
1da177e4 LT |
120 | .capability = SR_CAPABILITIES, |
121 | .generic_packet = sr_packet, | |
122 | }; | |
123 | ||
124 | static void sr_kref_release(struct kref *kref); | |
125 | ||
126 | static inline struct scsi_cd *scsi_cd(struct gendisk *disk) | |
127 | { | |
128 | return container_of(disk->private_data, struct scsi_cd, driver); | |
129 | } | |
130 | ||
131 | /* | |
132 | * The get and put routines for the struct scsi_cd. Note this entity | |
133 | * has a scsi_device pointer and owns a reference to this. | |
134 | */ | |
135 | static inline struct scsi_cd *scsi_cd_get(struct gendisk *disk) | |
136 | { | |
137 | struct scsi_cd *cd = NULL; | |
138 | ||
0b950672 | 139 | mutex_lock(&sr_ref_mutex); |
1da177e4 LT |
140 | if (disk->private_data == NULL) |
141 | goto out; | |
142 | cd = scsi_cd(disk); | |
143 | kref_get(&cd->kref); | |
144 | if (scsi_device_get(cd->device)) | |
145 | goto out_put; | |
146 | goto out; | |
147 | ||
148 | out_put: | |
149 | kref_put(&cd->kref, sr_kref_release); | |
150 | cd = NULL; | |
151 | out: | |
0b950672 | 152 | mutex_unlock(&sr_ref_mutex); |
1da177e4 LT |
153 | return cd; |
154 | } | |
155 | ||
858119e1 | 156 | static void scsi_cd_put(struct scsi_cd *cd) |
1da177e4 LT |
157 | { |
158 | struct scsi_device *sdev = cd->device; | |
159 | ||
0b950672 | 160 | mutex_lock(&sr_ref_mutex); |
1da177e4 LT |
161 | kref_put(&cd->kref, sr_kref_release); |
162 | scsi_device_put(sdev); | |
0b950672 | 163 | mutex_unlock(&sr_ref_mutex); |
1da177e4 LT |
164 | } |
165 | ||
166 | /* | |
167 | * This function checks to see if the media has been changed in the | |
168 | * CDROM drive. It is possible that we have already sensed a change, | |
169 | * or the drive may have sensed one and not yet reported it. We must | |
170 | * be ready for either case. This function always reports the current | |
171 | * value of the changed bit. If flag is 0, then the changed bit is reset. | |
172 | * This function could be done as an ioctl, but we would need to have | |
173 | * an inode for that to work, and we do not always have one. | |
174 | */ | |
175 | ||
44818efb | 176 | static int sr_media_change(struct cdrom_device_info *cdi, int slot) |
1da177e4 LT |
177 | { |
178 | struct scsi_cd *cd = cdi->handle; | |
179 | int retval; | |
180 | ||
181 | if (CDSL_CURRENT != slot) { | |
182 | /* no changer support */ | |
183 | return -EINVAL; | |
184 | } | |
185 | ||
186 | retval = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES); | |
187 | if (retval) { | |
188 | /* Unable to test, unit probably not ready. This usually | |
189 | * means there is no disc in the drive. Mark as changed, | |
190 | * and we will figure it out later once the drive is | |
191 | * available again. */ | |
192 | cd->device->changed = 1; | |
193 | return 1; /* This will force a flush, if called from | |
194 | * check_disk_change */ | |
195 | }; | |
196 | ||
197 | retval = cd->device->changed; | |
198 | cd->device->changed = 0; | |
199 | /* If the disk changed, the capacity will now be different, | |
200 | * so we force a re-read of this information */ | |
201 | if (retval) { | |
202 | /* check multisession offset etc */ | |
203 | sr_cd_check(cdi); | |
204 | ||
51490c89 | 205 | get_sectorsize(cd); |
1da177e4 LT |
206 | } |
207 | return retval; | |
208 | } | |
209 | ||
210 | /* | |
ac40532e | 211 | * rw_intr is the interrupt routine for the device driver. |
1da177e4 | 212 | * |
ac40532e | 213 | * It will be notified on the end of a SCSI read / write, and will take on |
1da177e4 LT |
214 | * of several actions based on success or failure. |
215 | */ | |
ac40532e | 216 | static void rw_intr(struct scsi_cmnd * SCpnt) |
1da177e4 LT |
217 | { |
218 | int result = SCpnt->result; | |
5d5ff44f | 219 | int this_count = SCpnt->request_bufflen; |
1da177e4 LT |
220 | int good_bytes = (result == 0 ? this_count : 0); |
221 | int block_sectors = 0; | |
222 | long error_sector; | |
223 | struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk); | |
224 | ||
225 | #ifdef DEBUG | |
226 | printk("sr.c done: %x\n", result); | |
227 | #endif | |
228 | ||
229 | /* | |
230 | * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial | |
231 | * success. Since this is a relatively rare error condition, no | |
232 | * care is taken to avoid unnecessary additional work such as | |
233 | * memcpy's that could be avoided. | |
234 | */ | |
235 | if (driver_byte(result) != 0 && /* An error occurred */ | |
236 | (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */ | |
237 | switch (SCpnt->sense_buffer[2]) { | |
238 | case MEDIUM_ERROR: | |
239 | case VOLUME_OVERFLOW: | |
240 | case ILLEGAL_REQUEST: | |
241 | if (!(SCpnt->sense_buffer[0] & 0x90)) | |
242 | break; | |
1da177e4 LT |
243 | error_sector = (SCpnt->sense_buffer[3] << 24) | |
244 | (SCpnt->sense_buffer[4] << 16) | | |
245 | (SCpnt->sense_buffer[5] << 8) | | |
246 | SCpnt->sense_buffer[6]; | |
247 | if (SCpnt->request->bio != NULL) | |
248 | block_sectors = | |
249 | bio_sectors(SCpnt->request->bio); | |
250 | if (block_sectors < 4) | |
251 | block_sectors = 4; | |
252 | if (cd->device->sector_size == 2048) | |
253 | error_sector <<= 2; | |
254 | error_sector &= ~(block_sectors - 1); | |
255 | good_bytes = (error_sector - SCpnt->request->sector) << 9; | |
256 | if (good_bytes < 0 || good_bytes >= this_count) | |
257 | good_bytes = 0; | |
258 | /* | |
259 | * The SCSI specification allows for the value | |
260 | * returned by READ CAPACITY to be up to 75 2K | |
261 | * sectors past the last readable block. | |
262 | * Therefore, if we hit a medium error within the | |
263 | * last 75 2K sectors, we decrease the saved size | |
264 | * value. | |
265 | */ | |
266 | if (error_sector < get_capacity(cd->disk) && | |
267 | cd->capacity - error_sector < 4 * 75) | |
268 | set_capacity(cd->disk, error_sector); | |
269 | break; | |
270 | ||
271 | case RECOVERED_ERROR: | |
272 | ||
273 | /* | |
274 | * An error occured, but it recovered. Inform the | |
275 | * user, but make sure that it's not treated as a | |
276 | * hard error. | |
277 | */ | |
278 | scsi_print_sense("sr", SCpnt); | |
279 | SCpnt->result = 0; | |
280 | SCpnt->sense_buffer[0] = 0x0; | |
281 | good_bytes = this_count; | |
282 | break; | |
283 | ||
284 | default: | |
285 | break; | |
286 | } | |
287 | } | |
288 | ||
ac40532e IM |
289 | /* |
290 | * This calls the generic completion function, now that we know | |
291 | * how many actual sectors finished, and how many sectors we need | |
292 | * to say have failed. | |
293 | */ | |
294 | scsi_io_completion(SCpnt, good_bytes); | |
1da177e4 LT |
295 | } |
296 | ||
7f9a6bc4 | 297 | static int sr_prep_fn(struct request_queue *q, struct request *rq) |
1da177e4 LT |
298 | { |
299 | int block=0, this_count, s_size, timeout = SR_TIMEOUT; | |
7f9a6bc4 JB |
300 | struct scsi_cd *cd; |
301 | struct scsi_cmnd *SCpnt; | |
302 | struct scsi_device *sdp = q->queuedata; | |
303 | int ret; | |
304 | ||
305 | if (rq->cmd_type == REQ_TYPE_BLOCK_PC) { | |
306 | ret = scsi_setup_blk_pc_cmnd(sdp, rq); | |
307 | goto out; | |
308 | } else if (rq->cmd_type != REQ_TYPE_FS) { | |
309 | ret = BLKPREP_KILL; | |
310 | goto out; | |
311 | } | |
312 | ret = scsi_setup_fs_cmnd(sdp, rq); | |
313 | if (ret != BLKPREP_OK) | |
314 | goto out; | |
315 | SCpnt = rq->special; | |
316 | cd = scsi_cd(rq->rq_disk); | |
317 | ||
318 | /* from here on until we're complete, any goto out | |
319 | * is used for a killable error condition */ | |
320 | ret = BLKPREP_KILL; | |
1da177e4 LT |
321 | |
322 | SCSI_LOG_HLQUEUE(1, printk("Doing sr request, dev = %s, block = %d\n", | |
323 | cd->disk->disk_name, block)); | |
324 | ||
325 | if (!cd->device || !scsi_device_online(cd->device)) { | |
326 | SCSI_LOG_HLQUEUE(2, printk("Finishing %ld sectors\n", | |
7f9a6bc4 | 327 | rq->nr_sectors)); |
1da177e4 | 328 | SCSI_LOG_HLQUEUE(2, printk("Retry with 0x%p\n", SCpnt)); |
7f9a6bc4 | 329 | goto out; |
1da177e4 LT |
330 | } |
331 | ||
332 | if (cd->device->changed) { | |
333 | /* | |
334 | * quietly refuse to do anything to a changed disc until the | |
335 | * changed bit has been reset | |
336 | */ | |
7f9a6bc4 | 337 | goto out; |
1da177e4 LT |
338 | } |
339 | ||
1da177e4 LT |
340 | /* |
341 | * we do lazy blocksize switching (when reading XA sectors, | |
342 | * see CDROMREADMODE2 ioctl) | |
343 | */ | |
344 | s_size = cd->device->sector_size; | |
345 | if (s_size > 2048) { | |
346 | if (!in_interrupt()) | |
347 | sr_set_blocklength(cd, 2048); | |
348 | else | |
349 | printk("sr: can't switch blocksize: in interrupt\n"); | |
350 | } | |
351 | ||
352 | if (s_size != 512 && s_size != 1024 && s_size != 2048) { | |
3bf743e7 | 353 | scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size); |
7f9a6bc4 | 354 | goto out; |
1da177e4 LT |
355 | } |
356 | ||
7f9a6bc4 | 357 | if (rq_data_dir(rq) == WRITE) { |
1da177e4 | 358 | if (!cd->device->writeable) |
7f9a6bc4 | 359 | goto out; |
1da177e4 LT |
360 | SCpnt->cmnd[0] = WRITE_10; |
361 | SCpnt->sc_data_direction = DMA_TO_DEVICE; | |
362 | cd->cdi.media_written = 1; | |
7f9a6bc4 | 363 | } else if (rq_data_dir(rq) == READ) { |
1da177e4 LT |
364 | SCpnt->cmnd[0] = READ_10; |
365 | SCpnt->sc_data_direction = DMA_FROM_DEVICE; | |
366 | } else { | |
7f9a6bc4 JB |
367 | blk_dump_rq_flags(rq, "Unknown sr command"); |
368 | goto out; | |
1da177e4 LT |
369 | } |
370 | ||
371 | { | |
372 | struct scatterlist *sg = SCpnt->request_buffer; | |
373 | int i, size = 0; | |
374 | for (i = 0; i < SCpnt->use_sg; i++) | |
375 | size += sg[i].length; | |
376 | ||
377 | if (size != SCpnt->request_bufflen && SCpnt->use_sg) { | |
3bf743e7 JG |
378 | scmd_printk(KERN_ERR, SCpnt, |
379 | "mismatch count %d, bytes %d\n", | |
380 | size, SCpnt->request_bufflen); | |
1da177e4 | 381 | if (SCpnt->request_bufflen > size) |
631c228c | 382 | SCpnt->request_bufflen = size; |
1da177e4 LT |
383 | } |
384 | } | |
385 | ||
386 | /* | |
387 | * request doesn't start on hw block boundary, add scatter pads | |
388 | */ | |
7f9a6bc4 | 389 | if (((unsigned int)rq->sector % (s_size >> 9)) || |
1da177e4 | 390 | (SCpnt->request_bufflen % s_size)) { |
3bf743e7 | 391 | scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n"); |
7f9a6bc4 | 392 | goto out; |
1da177e4 LT |
393 | } |
394 | ||
395 | this_count = (SCpnt->request_bufflen >> 9) / (s_size >> 9); | |
396 | ||
397 | ||
398 | SCSI_LOG_HLQUEUE(2, printk("%s : %s %d/%ld 512 byte blocks.\n", | |
399 | cd->cdi.name, | |
7f9a6bc4 | 400 | (rq_data_dir(rq) == WRITE) ? |
1da177e4 | 401 | "writing" : "reading", |
7f9a6bc4 | 402 | this_count, rq->nr_sectors)); |
1da177e4 LT |
403 | |
404 | SCpnt->cmnd[1] = 0; | |
7f9a6bc4 | 405 | block = (unsigned int)rq->sector / (s_size >> 9); |
1da177e4 LT |
406 | |
407 | if (this_count > 0xffff) { | |
408 | this_count = 0xffff; | |
631c228c | 409 | SCpnt->request_bufflen = this_count * s_size; |
1da177e4 LT |
410 | } |
411 | ||
412 | SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; | |
413 | SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; | |
414 | SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; | |
415 | SCpnt->cmnd[5] = (unsigned char) block & 0xff; | |
416 | SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; | |
417 | SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; | |
418 | SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; | |
419 | ||
420 | /* | |
421 | * We shouldn't disconnect in the middle of a sector, so with a dumb | |
422 | * host adapter, it's safe to assume that we can at least transfer | |
423 | * this many bytes between each connect / disconnect. | |
424 | */ | |
425 | SCpnt->transfersize = cd->device->sector_size; | |
426 | SCpnt->underflow = this_count << 9; | |
1da177e4 LT |
427 | SCpnt->allowed = MAX_RETRIES; |
428 | SCpnt->timeout_per_command = timeout; | |
429 | ||
ac40532e IM |
430 | /* |
431 | * This is the completion routine we use. This is matched in terms | |
432 | * of capability to this function. | |
433 | */ | |
434 | SCpnt->done = rw_intr; | |
435 | ||
1da177e4 LT |
436 | /* |
437 | * This indicates that the command is ready from our end to be | |
438 | * queued. | |
439 | */ | |
7f9a6bc4 JB |
440 | ret = BLKPREP_OK; |
441 | out: | |
442 | return scsi_prep_return(q, rq, ret); | |
1da177e4 LT |
443 | } |
444 | ||
445 | static int sr_block_open(struct inode *inode, struct file *file) | |
446 | { | |
447 | struct gendisk *disk = inode->i_bdev->bd_disk; | |
80d904c4 | 448 | struct scsi_cd *cd; |
1da177e4 LT |
449 | int ret = 0; |
450 | ||
451 | if(!(cd = scsi_cd_get(disk))) | |
452 | return -ENXIO; | |
453 | ||
454 | if((ret = cdrom_open(&cd->cdi, inode, file)) != 0) | |
455 | scsi_cd_put(cd); | |
456 | ||
457 | return ret; | |
458 | } | |
459 | ||
460 | static int sr_block_release(struct inode *inode, struct file *file) | |
461 | { | |
462 | int ret; | |
463 | struct scsi_cd *cd = scsi_cd(inode->i_bdev->bd_disk); | |
464 | ret = cdrom_release(&cd->cdi, file); | |
465 | if(ret) | |
466 | return ret; | |
467 | ||
468 | scsi_cd_put(cd); | |
469 | ||
470 | return 0; | |
471 | } | |
472 | ||
473 | static int sr_block_ioctl(struct inode *inode, struct file *file, unsigned cmd, | |
474 | unsigned long arg) | |
475 | { | |
476 | struct scsi_cd *cd = scsi_cd(inode->i_bdev->bd_disk); | |
477 | struct scsi_device *sdev = cd->device; | |
6a2900b6 CH |
478 | void __user *argp = (void __user *)arg; |
479 | int ret; | |
1da177e4 | 480 | |
6a2900b6 CH |
481 | /* |
482 | * Send SCSI addressing ioctls directly to mid level, send other | |
483 | * ioctls to cdrom/block level. | |
484 | */ | |
485 | switch (cmd) { | |
486 | case SCSI_IOCTL_GET_IDLUN: | |
487 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
488 | return scsi_ioctl(sdev, cmd, argp); | |
1da177e4 | 489 | } |
6a2900b6 CH |
490 | |
491 | ret = cdrom_ioctl(file, &cd->cdi, inode, cmd, arg); | |
6397256b | 492 | if (ret != -ENOSYS) |
6a2900b6 CH |
493 | return ret; |
494 | ||
495 | /* | |
496 | * ENODEV means that we didn't recognise the ioctl, or that we | |
497 | * cannot execute it in the current device state. In either | |
498 | * case fall through to scsi_ioctl, which will return ENDOEV again | |
499 | * if it doesn't recognise the ioctl | |
500 | */ | |
501 | ret = scsi_nonblockable_ioctl(sdev, cmd, argp, NULL); | |
502 | if (ret != -ENODEV) | |
503 | return ret; | |
504 | return scsi_ioctl(sdev, cmd, argp); | |
1da177e4 LT |
505 | } |
506 | ||
507 | static int sr_block_media_changed(struct gendisk *disk) | |
508 | { | |
509 | struct scsi_cd *cd = scsi_cd(disk); | |
510 | return cdrom_media_changed(&cd->cdi); | |
511 | } | |
512 | ||
513 | static struct block_device_operations sr_bdops = | |
514 | { | |
515 | .owner = THIS_MODULE, | |
516 | .open = sr_block_open, | |
517 | .release = sr_block_release, | |
518 | .ioctl = sr_block_ioctl, | |
519 | .media_changed = sr_block_media_changed, | |
520 | /* | |
521 | * No compat_ioctl for now because sr_block_ioctl never | |
522 | * seems to pass arbitary ioctls down to host drivers. | |
523 | */ | |
524 | }; | |
525 | ||
526 | static int sr_open(struct cdrom_device_info *cdi, int purpose) | |
527 | { | |
528 | struct scsi_cd *cd = cdi->handle; | |
529 | struct scsi_device *sdev = cd->device; | |
530 | int retval; | |
531 | ||
532 | /* | |
533 | * If the device is in error recovery, wait until it is done. | |
534 | * If the device is offline, then disallow any access to it. | |
535 | */ | |
536 | retval = -ENXIO; | |
537 | if (!scsi_block_when_processing_errors(sdev)) | |
538 | goto error_out; | |
539 | ||
1da177e4 LT |
540 | return 0; |
541 | ||
542 | error_out: | |
543 | return retval; | |
544 | } | |
545 | ||
546 | static void sr_release(struct cdrom_device_info *cdi) | |
547 | { | |
548 | struct scsi_cd *cd = cdi->handle; | |
549 | ||
550 | if (cd->device->sector_size > 2048) | |
551 | sr_set_blocklength(cd, 2048); | |
552 | ||
553 | } | |
554 | ||
555 | static int sr_probe(struct device *dev) | |
556 | { | |
557 | struct scsi_device *sdev = to_scsi_device(dev); | |
558 | struct gendisk *disk; | |
559 | struct scsi_cd *cd; | |
560 | int minor, error; | |
561 | ||
562 | error = -ENODEV; | |
563 | if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM) | |
564 | goto fail; | |
565 | ||
566 | error = -ENOMEM; | |
24669f75 | 567 | cd = kzalloc(sizeof(*cd), GFP_KERNEL); |
1da177e4 LT |
568 | if (!cd) |
569 | goto fail; | |
1da177e4 LT |
570 | |
571 | kref_init(&cd->kref); | |
572 | ||
573 | disk = alloc_disk(1); | |
574 | if (!disk) | |
575 | goto fail_free; | |
576 | ||
577 | spin_lock(&sr_index_lock); | |
578 | minor = find_first_zero_bit(sr_index_bits, SR_DISKS); | |
579 | if (minor == SR_DISKS) { | |
580 | spin_unlock(&sr_index_lock); | |
581 | error = -EBUSY; | |
582 | goto fail_put; | |
583 | } | |
584 | __set_bit(minor, sr_index_bits); | |
585 | spin_unlock(&sr_index_lock); | |
586 | ||
587 | disk->major = SCSI_CDROM_MAJOR; | |
588 | disk->first_minor = minor; | |
589 | sprintf(disk->disk_name, "sr%d", minor); | |
590 | disk->fops = &sr_bdops; | |
591 | disk->flags = GENHD_FL_CD; | |
592 | ||
593 | cd->device = sdev; | |
594 | cd->disk = disk; | |
595 | cd->driver = &sr_template; | |
596 | cd->disk = disk; | |
597 | cd->capacity = 0x1fffff; | |
1da177e4 LT |
598 | cd->device->changed = 1; /* force recheck CD type */ |
599 | cd->use = 1; | |
600 | cd->readcd_known = 0; | |
601 | cd->readcd_cdda = 0; | |
602 | ||
603 | cd->cdi.ops = &sr_dops; | |
604 | cd->cdi.handle = cd; | |
605 | cd->cdi.mask = 0; | |
606 | cd->cdi.capacity = 1; | |
607 | sprintf(cd->cdi.name, "sr%d", minor); | |
608 | ||
609 | sdev->sector_size = 2048; /* A guess, just in case */ | |
610 | ||
611 | /* FIXME: need to handle a get_capabilities failure properly ?? */ | |
612 | get_capabilities(cd); | |
7f9a6bc4 | 613 | blk_queue_prep_rq(sdev->request_queue, sr_prep_fn); |
1da177e4 LT |
614 | sr_vendor_init(cd); |
615 | ||
1da177e4 LT |
616 | disk->driverfs_dev = &sdev->sdev_gendev; |
617 | set_capacity(disk, cd->capacity); | |
618 | disk->private_data = &cd->driver; | |
619 | disk->queue = sdev->request_queue; | |
620 | cd->cdi.disk = disk; | |
621 | ||
622 | if (register_cdrom(&cd->cdi)) | |
623 | goto fail_put; | |
624 | ||
625 | dev_set_drvdata(dev, cd); | |
626 | disk->flags |= GENHD_FL_REMOVABLE; | |
627 | add_disk(disk); | |
628 | ||
9ccfc756 JB |
629 | sdev_printk(KERN_DEBUG, sdev, |
630 | "Attached scsi CD-ROM %s\n", cd->cdi.name); | |
1da177e4 LT |
631 | return 0; |
632 | ||
633 | fail_put: | |
634 | put_disk(disk); | |
635 | fail_free: | |
636 | kfree(cd); | |
637 | fail: | |
638 | return error; | |
639 | } | |
640 | ||
641 | ||
642 | static void get_sectorsize(struct scsi_cd *cd) | |
643 | { | |
644 | unsigned char cmd[10]; | |
645 | unsigned char *buffer; | |
646 | int the_result, retries = 3; | |
647 | int sector_size; | |
165125e1 | 648 | struct request_queue *queue; |
1da177e4 LT |
649 | |
650 | buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); | |
651 | if (!buffer) | |
652 | goto Enomem; | |
1da177e4 LT |
653 | |
654 | do { | |
655 | cmd[0] = READ_CAPACITY; | |
656 | memset((void *) &cmd[1], 0, 9); | |
1da177e4 LT |
657 | memset(buffer, 0, 8); |
658 | ||
659 | /* Do the command and wait.. */ | |
820732b5 JB |
660 | the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE, |
661 | buffer, 8, NULL, SR_TIMEOUT, | |
662 | MAX_RETRIES); | |
1da177e4 | 663 | |
1da177e4 LT |
664 | retries--; |
665 | ||
666 | } while (the_result && retries); | |
667 | ||
668 | ||
1da177e4 LT |
669 | if (the_result) { |
670 | cd->capacity = 0x1fffff; | |
671 | sector_size = 2048; /* A guess, just in case */ | |
1da177e4 LT |
672 | } else { |
673 | #if 0 | |
674 | if (cdrom_get_last_written(&cd->cdi, | |
675 | &cd->capacity)) | |
676 | #endif | |
677 | cd->capacity = 1 + ((buffer[0] << 24) | | |
678 | (buffer[1] << 16) | | |
679 | (buffer[2] << 8) | | |
680 | buffer[3]); | |
681 | sector_size = (buffer[4] << 24) | | |
682 | (buffer[5] << 16) | (buffer[6] << 8) | buffer[7]; | |
683 | switch (sector_size) { | |
684 | /* | |
685 | * HP 4020i CD-Recorder reports 2340 byte sectors | |
686 | * Philips CD-Writers report 2352 byte sectors | |
687 | * | |
688 | * Use 2k sectors for them.. | |
689 | */ | |
690 | case 0: | |
691 | case 2340: | |
692 | case 2352: | |
693 | sector_size = 2048; | |
694 | /* fall through */ | |
695 | case 2048: | |
696 | cd->capacity *= 4; | |
697 | /* fall through */ | |
698 | case 512: | |
699 | break; | |
700 | default: | |
701 | printk("%s: unsupported sector size %d.\n", | |
702 | cd->cdi.name, sector_size); | |
703 | cd->capacity = 0; | |
1da177e4 LT |
704 | } |
705 | ||
706 | cd->device->sector_size = sector_size; | |
707 | ||
708 | /* | |
709 | * Add this so that we have the ability to correctly gauge | |
710 | * what the device is capable of. | |
711 | */ | |
1da177e4 LT |
712 | set_capacity(cd->disk, cd->capacity); |
713 | } | |
714 | ||
715 | queue = cd->device->request_queue; | |
716 | blk_queue_hardsect_size(queue, sector_size); | |
717 | out: | |
718 | kfree(buffer); | |
719 | return; | |
720 | ||
721 | Enomem: | |
722 | cd->capacity = 0x1fffff; | |
51490c89 | 723 | cd->device->sector_size = 2048; /* A guess, just in case */ |
1da177e4 LT |
724 | goto out; |
725 | } | |
726 | ||
727 | static void get_capabilities(struct scsi_cd *cd) | |
728 | { | |
729 | unsigned char *buffer; | |
730 | struct scsi_mode_data data; | |
1da177e4 | 731 | unsigned char cmd[MAX_COMMAND_SIZE]; |
820732b5 | 732 | struct scsi_sense_hdr sshdr; |
1da177e4 LT |
733 | unsigned int the_result; |
734 | int retries, rc, n; | |
735 | ||
0ad78200 | 736 | static const char *loadmech[] = |
1da177e4 LT |
737 | { |
738 | "caddy", | |
739 | "tray", | |
740 | "pop-up", | |
741 | "", | |
742 | "changer", | |
743 | "cartridge changer", | |
744 | "", | |
745 | "" | |
746 | }; | |
747 | ||
1da177e4 LT |
748 | |
749 | /* allocate transfer buffer */ | |
750 | buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); | |
751 | if (!buffer) { | |
752 | printk(KERN_ERR "sr: out of memory.\n"); | |
1da177e4 LT |
753 | return; |
754 | } | |
755 | ||
756 | /* issue TEST_UNIT_READY until the initial startup UNIT_ATTENTION | |
757 | * conditions are gone, or a timeout happens | |
758 | */ | |
759 | retries = 0; | |
760 | do { | |
761 | memset((void *)cmd, 0, MAX_COMMAND_SIZE); | |
762 | cmd[0] = TEST_UNIT_READY; | |
763 | ||
820732b5 JB |
764 | the_result = scsi_execute_req (cd->device, cmd, DMA_NONE, NULL, |
765 | 0, &sshdr, SR_TIMEOUT, | |
766 | MAX_RETRIES); | |
1da177e4 | 767 | |
1da177e4 LT |
768 | retries++; |
769 | } while (retries < 5 && | |
770 | (!scsi_status_is_good(the_result) || | |
820732b5 JB |
771 | (scsi_sense_valid(&sshdr) && |
772 | sshdr.sense_key == UNIT_ATTENTION))); | |
1da177e4 LT |
773 | |
774 | /* ask for mode page 0x2a */ | |
775 | rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, 128, | |
1cf72699 | 776 | SR_TIMEOUT, 3, &data, NULL); |
1da177e4 LT |
777 | |
778 | if (!scsi_status_is_good(rc)) { | |
779 | /* failed, drive doesn't have capabilities mode page */ | |
780 | cd->cdi.speed = 1; | |
781 | cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R | | |
bcc1e382 CE |
782 | CDC_DVD | CDC_DVD_RAM | |
783 | CDC_SELECT_DISC | CDC_SELECT_SPEED | | |
784 | CDC_MRW | CDC_MRW_W | CDC_RAM); | |
1da177e4 LT |
785 | kfree(buffer); |
786 | printk("%s: scsi-1 drive\n", cd->cdi.name); | |
787 | return; | |
788 | } | |
789 | ||
790 | n = data.header_length + data.block_descriptor_length; | |
791 | cd->cdi.speed = ((buffer[n + 8] << 8) + buffer[n + 9]) / 176; | |
792 | cd->readcd_known = 1; | |
793 | cd->readcd_cdda = buffer[n + 5] & 0x01; | |
794 | /* print some capability bits */ | |
795 | printk("%s: scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", cd->cdi.name, | |
796 | ((buffer[n + 14] << 8) + buffer[n + 15]) / 176, | |
797 | cd->cdi.speed, | |
798 | buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */ | |
799 | buffer[n + 3] & 0x20 ? "dvd-ram " : "", | |
800 | buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */ | |
801 | buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */ | |
802 | buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */ | |
803 | loadmech[buffer[n + 6] >> 5]); | |
804 | if ((buffer[n + 6] >> 5) == 0) | |
805 | /* caddy drives can't close tray... */ | |
806 | cd->cdi.mask |= CDC_CLOSE_TRAY; | |
807 | if ((buffer[n + 2] & 0x8) == 0) | |
808 | /* not a DVD drive */ | |
809 | cd->cdi.mask |= CDC_DVD; | |
810 | if ((buffer[n + 3] & 0x20) == 0) | |
811 | /* can't write DVD-RAM media */ | |
812 | cd->cdi.mask |= CDC_DVD_RAM; | |
813 | if ((buffer[n + 3] & 0x10) == 0) | |
814 | /* can't write DVD-R media */ | |
815 | cd->cdi.mask |= CDC_DVD_R; | |
816 | if ((buffer[n + 3] & 0x2) == 0) | |
817 | /* can't write CD-RW media */ | |
818 | cd->cdi.mask |= CDC_CD_RW; | |
819 | if ((buffer[n + 3] & 0x1) == 0) | |
820 | /* can't write CD-R media */ | |
821 | cd->cdi.mask |= CDC_CD_R; | |
822 | if ((buffer[n + 6] & 0x8) == 0) | |
823 | /* can't eject */ | |
824 | cd->cdi.mask |= CDC_OPEN_TRAY; | |
825 | ||
826 | if ((buffer[n + 6] >> 5) == mechtype_individual_changer || | |
827 | (buffer[n + 6] >> 5) == mechtype_cartridge_changer) | |
828 | cd->cdi.capacity = | |
829 | cdrom_number_of_slots(&cd->cdi); | |
830 | if (cd->cdi.capacity <= 1) | |
831 | /* not a changer */ | |
832 | cd->cdi.mask |= CDC_SELECT_DISC; | |
833 | /*else I don't think it can close its tray | |
834 | cd->cdi.mask |= CDC_CLOSE_TRAY; */ | |
835 | ||
836 | /* | |
837 | * if DVD-RAM, MRW-W or CD-RW, we are randomly writable | |
838 | */ | |
839 | if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) != | |
840 | (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) { | |
841 | cd->device->writeable = 1; | |
842 | } | |
843 | ||
1da177e4 LT |
844 | kfree(buffer); |
845 | } | |
846 | ||
847 | /* | |
848 | * sr_packet() is the entry point for the generic commands generated | |
849 | * by the Uniform CD-ROM layer. | |
850 | */ | |
851 | static int sr_packet(struct cdrom_device_info *cdi, | |
852 | struct packet_command *cgc) | |
853 | { | |
854 | if (cgc->timeout <= 0) | |
855 | cgc->timeout = IOCTL_TIMEOUT; | |
856 | ||
857 | sr_do_ioctl(cdi->handle, cgc); | |
858 | ||
859 | return cgc->stat; | |
860 | } | |
861 | ||
862 | /** | |
863 | * sr_kref_release - Called to free the scsi_cd structure | |
864 | * @kref: pointer to embedded kref | |
865 | * | |
0b950672 | 866 | * sr_ref_mutex must be held entering this routine. Because it is |
1da177e4 LT |
867 | * called on last put, you should always use the scsi_cd_get() |
868 | * scsi_cd_put() helpers which manipulate the semaphore directly | |
869 | * and never do a direct kref_put(). | |
870 | **/ | |
871 | static void sr_kref_release(struct kref *kref) | |
872 | { | |
873 | struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref); | |
874 | struct gendisk *disk = cd->disk; | |
875 | ||
876 | spin_lock(&sr_index_lock); | |
877 | clear_bit(disk->first_minor, sr_index_bits); | |
878 | spin_unlock(&sr_index_lock); | |
879 | ||
880 | unregister_cdrom(&cd->cdi); | |
881 | ||
882 | disk->private_data = NULL; | |
883 | ||
884 | put_disk(disk); | |
885 | ||
886 | kfree(cd); | |
887 | } | |
888 | ||
889 | static int sr_remove(struct device *dev) | |
890 | { | |
891 | struct scsi_cd *cd = dev_get_drvdata(dev); | |
892 | ||
893 | del_gendisk(cd->disk); | |
894 | ||
0b950672 | 895 | mutex_lock(&sr_ref_mutex); |
1da177e4 | 896 | kref_put(&cd->kref, sr_kref_release); |
0b950672 | 897 | mutex_unlock(&sr_ref_mutex); |
1da177e4 LT |
898 | |
899 | return 0; | |
900 | } | |
901 | ||
902 | static int __init init_sr(void) | |
903 | { | |
904 | int rc; | |
905 | ||
906 | rc = register_blkdev(SCSI_CDROM_MAJOR, "sr"); | |
907 | if (rc) | |
908 | return rc; | |
da3962fe AM |
909 | rc = scsi_register_driver(&sr_template.gendrv); |
910 | if (rc) | |
911 | unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); | |
912 | ||
913 | return rc; | |
1da177e4 LT |
914 | } |
915 | ||
916 | static void __exit exit_sr(void) | |
917 | { | |
918 | scsi_unregister_driver(&sr_template.gendrv); | |
919 | unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); | |
920 | } | |
921 | ||
922 | module_init(init_sr); | |
923 | module_exit(exit_sr); | |
924 | MODULE_LICENSE("GPL"); |