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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038#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>
Arjan van de Ven0b950672006-01-11 13:16:10 +010046#include <linux/mutex.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090047#include <linux/slab.h>
Aaron Lu6c7f1e22013-01-23 15:09:31 +080048#include <linux/pm_runtime.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070049#include <asm/uaccess.h>
50
51#include <scsi/scsi.h>
52#include <scsi/scsi_dbg.h>
53#include <scsi/scsi_device.h>
54#include <scsi/scsi_driver.h>
James Bottomley820732b2005-06-12 22:21:29 -050055#include <scsi/scsi_cmnd.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070056#include <scsi/scsi_eh.h>
57#include <scsi/scsi_host.h>
58#include <scsi/scsi_ioctl.h> /* For the door lock/unlock commands */
Linus Torvalds1da177e2005-04-16 15:20:36 -070059
60#include "scsi_logging.h"
61#include "sr.h"
62
63
Rene Hermanf018fa52006-03-08 00:14:20 -080064MODULE_DESCRIPTION("SCSI cdrom (sr) driver");
65MODULE_LICENSE("GPL");
66MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_CDROM_MAJOR);
Michael Tokarevd7b8bcb2006-10-27 16:02:37 +040067MODULE_ALIAS_SCSI_DEVICE(TYPE_ROM);
68MODULE_ALIAS_SCSI_DEVICE(TYPE_WORM);
Rene Hermanf018fa52006-03-08 00:14:20 -080069
Linus Torvalds1da177e2005-04-16 15:20:36 -070070#define SR_DISKS 256
71
Linus Torvalds1da177e2005-04-16 15:20:36 -070072#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| \
Christoph Hellwig6a2900b2006-03-23 03:00:15 -080075 CDC_PLAY_AUDIO|CDC_RESET|CDC_DRIVE_STATUS| \
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 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
Arnd Bergmann2a48fc02010-06-02 14:28:52 +020079static DEFINE_MUTEX(sr_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070080static int sr_probe(struct device *);
81static int sr_remove(struct device *);
Linus Torvalds7b3d9542008-01-06 10:17:12 -080082static int sr_done(struct scsi_cmnd *);
Aaron Lu6c7f1e22013-01-23 15:09:31 +080083static int sr_runtime_suspend(struct device *dev);
84
85static struct dev_pm_ops sr_pm_ops = {
86 .runtime_suspend = sr_runtime_suspend,
87};
Linus Torvalds1da177e2005-04-16 15:20:36 -070088
89static struct scsi_driver sr_template = {
90 .owner = THIS_MODULE,
91 .gendrv = {
92 .name = "sr",
93 .probe = sr_probe,
94 .remove = sr_remove,
Aaron Lu6c7f1e22013-01-23 15:09:31 +080095 .pm = &sr_pm_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 },
Linus Torvalds7b3d9542008-01-06 10:17:12 -080097 .done = sr_done,
Linus Torvalds1da177e2005-04-16 15:20:36 -070098};
99
100static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG];
101static DEFINE_SPINLOCK(sr_index_lock);
102
103/* This semaphore is used to mediate the 0->1 reference get in the
104 * face of object destruction (i.e. we can't allow a get on an
105 * object after last put) */
Arjan van de Ven0b950672006-01-11 13:16:10 +0100106static DEFINE_MUTEX(sr_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107
108static int sr_open(struct cdrom_device_info *, int);
109static void sr_release(struct cdrom_device_info *);
110
111static void get_sectorsize(struct scsi_cd *);
112static void get_capabilities(struct scsi_cd *);
113
Tejun Heo93aae172010-12-16 17:52:17 +0100114static unsigned int sr_check_events(struct cdrom_device_info *cdi,
115 unsigned int clearing, int slot);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116static int sr_packet(struct cdrom_device_info *, struct packet_command *);
117
118static struct cdrom_device_ops sr_dops = {
119 .open = sr_open,
120 .release = sr_release,
121 .drive_status = sr_drive_status,
Tejun Heo93aae172010-12-16 17:52:17 +0100122 .check_events = sr_check_events,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 .tray_move = sr_tray_move,
124 .lock_door = sr_lock_door,
125 .select_speed = sr_select_speed,
126 .get_last_session = sr_get_last_session,
127 .get_mcn = sr_get_mcn,
128 .reset = sr_reset,
129 .audio_ioctl = sr_audio_ioctl,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130 .capability = SR_CAPABILITIES,
131 .generic_packet = sr_packet,
132};
133
134static void sr_kref_release(struct kref *kref);
135
136static inline struct scsi_cd *scsi_cd(struct gendisk *disk)
137{
138 return container_of(disk->private_data, struct scsi_cd, driver);
139}
140
Aaron Lu6c7f1e22013-01-23 15:09:31 +0800141static int sr_runtime_suspend(struct device *dev)
142{
143 struct scsi_cd *cd = dev_get_drvdata(dev);
144
145 if (cd->media_present)
146 return -EBUSY;
147 else
148 return 0;
149}
150
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151/*
152 * The get and put routines for the struct scsi_cd. Note this entity
153 * has a scsi_device pointer and owns a reference to this.
154 */
155static inline struct scsi_cd *scsi_cd_get(struct gendisk *disk)
156{
157 struct scsi_cd *cd = NULL;
158
Arjan van de Ven0b950672006-01-11 13:16:10 +0100159 mutex_lock(&sr_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 if (disk->private_data == NULL)
161 goto out;
162 cd = scsi_cd(disk);
163 kref_get(&cd->kref);
164 if (scsi_device_get(cd->device))
165 goto out_put;
Aaron Lu6c7f1e22013-01-23 15:09:31 +0800166 if (!scsi_autopm_get_device(cd->device))
167 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168
169 out_put:
170 kref_put(&cd->kref, sr_kref_release);
171 cd = NULL;
172 out:
Arjan van de Ven0b950672006-01-11 13:16:10 +0100173 mutex_unlock(&sr_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 return cd;
175}
176
Arjan van de Ven858119e2006-01-14 13:20:43 -0800177static void scsi_cd_put(struct scsi_cd *cd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178{
179 struct scsi_device *sdev = cd->device;
180
Arjan van de Ven0b950672006-01-11 13:16:10 +0100181 mutex_lock(&sr_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 kref_put(&cd->kref, sr_kref_release);
Aaron Lu6c7f1e22013-01-23 15:09:31 +0800183 scsi_autopm_put_device(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 scsi_device_put(sdev);
Arjan van de Ven0b950672006-01-11 13:16:10 +0100185 mutex_unlock(&sr_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186}
187
Tejun Heo93aae172010-12-16 17:52:17 +0100188static unsigned int sr_get_events(struct scsi_device *sdev)
189{
190 u8 buf[8];
191 u8 cmd[] = { GET_EVENT_STATUS_NOTIFICATION,
192 1, /* polled */
193 0, 0, /* reserved */
194 1 << 4, /* notification class: media */
195 0, 0, /* reserved */
196 0, sizeof(buf), /* allocation length */
197 0, /* control */
198 };
199 struct event_header *eh = (void *)buf;
200 struct media_event_desc *med = (void *)(buf + 4);
201 struct scsi_sense_hdr sshdr;
202 int result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203
Tejun Heo93aae172010-12-16 17:52:17 +0100204 result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, sizeof(buf),
205 &sshdr, SR_TIMEOUT, MAX_RETRIES, NULL);
206 if (scsi_sense_valid(&sshdr) && sshdr.sense_key == UNIT_ATTENTION)
207 return DISK_EVENT_MEDIA_CHANGE;
208
209 if (result || be16_to_cpu(eh->data_len) < sizeof(*med))
210 return 0;
211
212 if (eh->nea || eh->notification_class != 0x4)
213 return 0;
214
215 if (med->media_event_code == 1)
216 return DISK_EVENT_EJECT_REQUEST;
217 else if (med->media_event_code == 2)
218 return DISK_EVENT_MEDIA_CHANGE;
219 return 0;
220}
221
222/*
223 * This function checks to see if the media has been changed or eject
224 * button has been pressed. It is possible that we have already
225 * sensed a change, or the drive may have sensed one and not yet
226 * reported it. The past events are accumulated in sdev->changed and
227 * returned together with the current state.
228 */
229static unsigned int sr_check_events(struct cdrom_device_info *cdi,
230 unsigned int clearing, int slot)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231{
232 struct scsi_cd *cd = cdi->handle;
Tejun Heo93aae172010-12-16 17:52:17 +0100233 bool last_present;
234 struct scsi_sense_hdr sshdr;
235 unsigned int events;
236 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237
Tejun Heo93aae172010-12-16 17:52:17 +0100238 /* no changer support */
239 if (CDSL_CURRENT != slot)
240 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241
Tejun Heo93aae172010-12-16 17:52:17 +0100242 events = sr_get_events(cd->device);
Kay Sievers79b96772011-06-30 15:03:48 +0200243 cd->get_event_changed |= events & DISK_EVENT_MEDIA_CHANGE;
244
245 /*
246 * If earlier GET_EVENT_STATUS_NOTIFICATION and TUR did not agree
247 * for several times in a row. We rely on TUR only for this likely
248 * broken device, to prevent generating incorrect media changed
249 * events for every open().
250 */
251 if (cd->ignore_get_event) {
252 events &= ~DISK_EVENT_MEDIA_CHANGE;
253 goto do_tur;
254 }
255
Tejun Heo93aae172010-12-16 17:52:17 +0100256 /*
257 * GET_EVENT_STATUS_NOTIFICATION is enough unless MEDIA_CHANGE
258 * is being cleared. Note that there are devices which hang
259 * if asked to execute TUR repeatedly.
260 */
Kay Sievers79b96772011-06-30 15:03:48 +0200261 if (cd->device->changed) {
262 events |= DISK_EVENT_MEDIA_CHANGE;
263 cd->device->changed = 0;
264 cd->tur_changed = true;
265 }
Tejun Heo93aae172010-12-16 17:52:17 +0100266
Kay Sievers79b96772011-06-30 15:03:48 +0200267 if (!(clearing & DISK_EVENT_MEDIA_CHANGE))
268 return events;
269do_tur:
Tejun Heo93aae172010-12-16 17:52:17 +0100270 /* let's see whether the media is there with TUR */
271 last_present = cd->media_present;
272 ret = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr);
273
Tejun Heo638428e2010-12-09 11:18:42 +0100274 /*
275 * Media is considered to be present if TUR succeeds or fails with
276 * sense data indicating something other than media-not-present
277 * (ASC 0x3a).
278 */
Tejun Heo93aae172010-12-16 17:52:17 +0100279 cd->media_present = scsi_status_is_good(ret) ||
280 (scsi_sense_valid(&sshdr) && sshdr.asc != 0x3a);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281
Tejun Heo93aae172010-12-16 17:52:17 +0100282 if (last_present != cd->media_present)
Kay Sievers79b96772011-06-30 15:03:48 +0200283 cd->device->changed = 1;
284
Tejun Heo93aae172010-12-16 17:52:17 +0100285 if (cd->device->changed) {
286 events |= DISK_EVENT_MEDIA_CHANGE;
287 cd->device->changed = 0;
Kay Sievers79b96772011-06-30 15:03:48 +0200288 cd->tur_changed = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 }
Kay Sievers285e9672007-08-14 14:10:39 +0200290
Kay Sievers79b96772011-06-30 15:03:48 +0200291 if (cd->ignore_get_event)
292 return events;
293
294 /* check whether GET_EVENT is reporting spurious MEDIA_CHANGE */
295 if (!cd->tur_changed) {
296 if (cd->get_event_changed) {
297 if (cd->tur_mismatch++ > 8) {
298 sdev_printk(KERN_WARNING, cd->device,
299 "GET_EVENT and TUR disagree continuously, suppress GET_EVENT events\n");
300 cd->ignore_get_event = true;
301 }
302 } else {
303 cd->tur_mismatch = 0;
304 }
305 }
306 cd->tur_changed = false;
307 cd->get_event_changed = false;
308
Tejun Heo93aae172010-12-16 17:52:17 +0100309 return events;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310}
Tejun Heo93aae172010-12-16 17:52:17 +0100311
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312/*
Linus Torvalds7b3d9542008-01-06 10:17:12 -0800313 * sr_done is the interrupt routine for the device driver.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 *
Linus Torvalds7b3d9542008-01-06 10:17:12 -0800315 * It will be notified on the end of a SCSI read / write, and will take one
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 * of several actions based on success or failure.
317 */
Linus Torvalds7b3d9542008-01-06 10:17:12 -0800318static int sr_done(struct scsi_cmnd *SCpnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319{
320 int result = SCpnt->result;
Boaz Harrosh30b0c372007-12-13 13:47:40 +0200321 int this_count = scsi_bufflen(SCpnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 int good_bytes = (result == 0 ? this_count : 0);
323 int block_sectors = 0;
324 long error_sector;
325 struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk);
326
327#ifdef DEBUG
328 printk("sr.c done: %x\n", result);
329#endif
330
331 /*
332 * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial
333 * success. Since this is a relatively rare error condition, no
334 * care is taken to avoid unnecessary additional work such as
335 * memcpy's that could be avoided.
336 */
337 if (driver_byte(result) != 0 && /* An error occurred */
338 (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */
339 switch (SCpnt->sense_buffer[2]) {
340 case MEDIUM_ERROR:
341 case VOLUME_OVERFLOW:
342 case ILLEGAL_REQUEST:
343 if (!(SCpnt->sense_buffer[0] & 0x90))
344 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 error_sector = (SCpnt->sense_buffer[3] << 24) |
346 (SCpnt->sense_buffer[4] << 16) |
347 (SCpnt->sense_buffer[5] << 8) |
348 SCpnt->sense_buffer[6];
349 if (SCpnt->request->bio != NULL)
350 block_sectors =
351 bio_sectors(SCpnt->request->bio);
352 if (block_sectors < 4)
353 block_sectors = 4;
354 if (cd->device->sector_size == 2048)
355 error_sector <<= 2;
356 error_sector &= ~(block_sectors - 1);
Tejun Heo83096eb2009-05-07 22:24:39 +0900357 good_bytes = (error_sector -
358 blk_rq_pos(SCpnt->request)) << 9;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 if (good_bytes < 0 || good_bytes >= this_count)
360 good_bytes = 0;
361 /*
362 * The SCSI specification allows for the value
363 * returned by READ CAPACITY to be up to 75 2K
364 * sectors past the last readable block.
365 * Therefore, if we hit a medium error within the
366 * last 75 2K sectors, we decrease the saved size
367 * value.
368 */
369 if (error_sector < get_capacity(cd->disk) &&
370 cd->capacity - error_sector < 4 * 75)
371 set_capacity(cd->disk, error_sector);
372 break;
373
374 case RECOVERED_ERROR:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 good_bytes = this_count;
376 break;
377
378 default:
379 break;
380 }
381 }
382
Linus Torvalds7b3d9542008-01-06 10:17:12 -0800383 return good_bytes;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384}
385
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500386static int sr_prep_fn(struct request_queue *q, struct request *rq)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387{
Jens Axboe242f9dc2008-09-14 05:55:09 -0700388 int block = 0, this_count, s_size;
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500389 struct scsi_cd *cd;
390 struct scsi_cmnd *SCpnt;
391 struct scsi_device *sdp = q->queuedata;
392 int ret;
393
394 if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
395 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
396 goto out;
397 } else if (rq->cmd_type != REQ_TYPE_FS) {
398 ret = BLKPREP_KILL;
399 goto out;
400 }
401 ret = scsi_setup_fs_cmnd(sdp, rq);
402 if (ret != BLKPREP_OK)
403 goto out;
404 SCpnt = rq->special;
405 cd = scsi_cd(rq->rq_disk);
406
407 /* from here on until we're complete, any goto out
408 * is used for a killable error condition */
409 ret = BLKPREP_KILL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410
411 SCSI_LOG_HLQUEUE(1, printk("Doing sr request, dev = %s, block = %d\n",
412 cd->disk->disk_name, block));
413
414 if (!cd->device || !scsi_device_online(cd->device)) {
Tejun Heo83096eb2009-05-07 22:24:39 +0900415 SCSI_LOG_HLQUEUE(2, printk("Finishing %u sectors\n",
416 blk_rq_sectors(rq)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417 SCSI_LOG_HLQUEUE(2, printk("Retry with 0x%p\n", SCpnt));
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500418 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 }
420
421 if (cd->device->changed) {
422 /*
423 * quietly refuse to do anything to a changed disc until the
424 * changed bit has been reset
425 */
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500426 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 }
428
429 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 * we do lazy blocksize switching (when reading XA sectors,
431 * see CDROMREADMODE2 ioctl)
432 */
433 s_size = cd->device->sector_size;
434 if (s_size > 2048) {
435 if (!in_interrupt())
436 sr_set_blocklength(cd, 2048);
437 else
438 printk("sr: can't switch blocksize: in interrupt\n");
439 }
440
441 if (s_size != 512 && s_size != 1024 && s_size != 2048) {
Jeff Garzik3bf743e2005-10-24 18:04:06 -0400442 scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size);
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500443 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 }
445
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500446 if (rq_data_dir(rq) == WRITE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 if (!cd->device->writeable)
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500448 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 SCpnt->cmnd[0] = WRITE_10;
450 SCpnt->sc_data_direction = DMA_TO_DEVICE;
451 cd->cdi.media_written = 1;
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500452 } else if (rq_data_dir(rq) == READ) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 SCpnt->cmnd[0] = READ_10;
454 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
455 } else {
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500456 blk_dump_rq_flags(rq, "Unknown sr command");
457 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 }
459
460 {
Boaz Harrosh30b0c372007-12-13 13:47:40 +0200461 struct scatterlist *sg;
462 int i, size = 0, sg_count = scsi_sg_count(SCpnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463
Boaz Harrosh30b0c372007-12-13 13:47:40 +0200464 scsi_for_each_sg(SCpnt, sg, sg_count, i)
465 size += sg->length;
466
467 if (size != scsi_bufflen(SCpnt)) {
Jeff Garzik3bf743e2005-10-24 18:04:06 -0400468 scmd_printk(KERN_ERR, SCpnt,
469 "mismatch count %d, bytes %d\n",
Boaz Harrosh30b0c372007-12-13 13:47:40 +0200470 size, scsi_bufflen(SCpnt));
471 if (scsi_bufflen(SCpnt) > size)
472 SCpnt->sdb.length = size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 }
474 }
475
476 /*
477 * request doesn't start on hw block boundary, add scatter pads
478 */
Tejun Heo83096eb2009-05-07 22:24:39 +0900479 if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) ||
Boaz Harrosh30b0c372007-12-13 13:47:40 +0200480 (scsi_bufflen(SCpnt) % s_size)) {
Jeff Garzik3bf743e2005-10-24 18:04:06 -0400481 scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n");
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500482 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 }
484
Boaz Harrosh30b0c372007-12-13 13:47:40 +0200485 this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486
487
Tejun Heo83096eb2009-05-07 22:24:39 +0900488 SCSI_LOG_HLQUEUE(2, printk("%s : %s %d/%u 512 byte blocks.\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 cd->cdi.name,
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500490 (rq_data_dir(rq) == WRITE) ?
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491 "writing" : "reading",
Tejun Heo83096eb2009-05-07 22:24:39 +0900492 this_count, blk_rq_sectors(rq)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493
494 SCpnt->cmnd[1] = 0;
Tejun Heo83096eb2009-05-07 22:24:39 +0900495 block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496
497 if (this_count > 0xffff) {
498 this_count = 0xffff;
Boaz Harrosh30b0c372007-12-13 13:47:40 +0200499 SCpnt->sdb.length = this_count * s_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 }
501
502 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
503 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
504 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
505 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
506 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
507 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
508 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
509
510 /*
511 * We shouldn't disconnect in the middle of a sector, so with a dumb
512 * host adapter, it's safe to assume that we can at least transfer
513 * this many bytes between each connect / disconnect.
514 */
515 SCpnt->transfersize = cd->device->sector_size;
516 SCpnt->underflow = this_count << 9;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 SCpnt->allowed = MAX_RETRIES;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518
519 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520 * This indicates that the command is ready from our end to be
521 * queued.
522 */
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500523 ret = BLKPREP_OK;
524 out:
525 return scsi_prep_return(q, rq, ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526}
527
Al Viro40cc51b2008-03-02 10:41:28 -0500528static int sr_block_open(struct block_device *bdev, fmode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529{
Arnd Bergmann6e9624b2010-08-07 18:25:34 +0200530 struct scsi_cd *cd;
Al Viro40cc51b2008-03-02 10:41:28 -0500531 int ret = -ENXIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532
Arnd Bergmann2a48fc02010-06-02 14:28:52 +0200533 mutex_lock(&sr_mutex);
Arnd Bergmann6e9624b2010-08-07 18:25:34 +0200534 cd = scsi_cd_get(bdev->bd_disk);
Al Viro40cc51b2008-03-02 10:41:28 -0500535 if (cd) {
536 ret = cdrom_open(&cd->cdi, bdev, mode);
537 if (ret)
538 scsi_cd_put(cd);
539 }
Arnd Bergmann2a48fc02010-06-02 14:28:52 +0200540 mutex_unlock(&sr_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 return ret;
542}
543
Al Viro40cc51b2008-03-02 10:41:28 -0500544static int sr_block_release(struct gendisk *disk, fmode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545{
Al Viro40cc51b2008-03-02 10:41:28 -0500546 struct scsi_cd *cd = scsi_cd(disk);
Arnd Bergmann2a48fc02010-06-02 14:28:52 +0200547 mutex_lock(&sr_mutex);
Al Viro40cc51b2008-03-02 10:41:28 -0500548 cdrom_release(&cd->cdi, mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 scsi_cd_put(cd);
Arnd Bergmann2a48fc02010-06-02 14:28:52 +0200550 mutex_unlock(&sr_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 return 0;
552}
553
Al Viro40cc51b2008-03-02 10:41:28 -0500554static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 unsigned long arg)
556{
Al Viro40cc51b2008-03-02 10:41:28 -0500557 struct scsi_cd *cd = scsi_cd(bdev->bd_disk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558 struct scsi_device *sdev = cd->device;
Christoph Hellwig6a2900b2006-03-23 03:00:15 -0800559 void __user *argp = (void __user *)arg;
560 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561
Aaron Lu6c7f1e22013-01-23 15:09:31 +0800562 scsi_autopm_get_device(cd->device);
563
Arnd Bergmann2a48fc02010-06-02 14:28:52 +0200564 mutex_lock(&sr_mutex);
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +0200565
Christoph Hellwig6a2900b2006-03-23 03:00:15 -0800566 /*
567 * Send SCSI addressing ioctls directly to mid level, send other
568 * ioctls to cdrom/block level.
569 */
570 switch (cmd) {
571 case SCSI_IOCTL_GET_IDLUN:
572 case SCSI_IOCTL_GET_BUS_NUMBER:
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +0200573 ret = scsi_ioctl(sdev, cmd, argp);
574 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575 }
Christoph Hellwig6a2900b2006-03-23 03:00:15 -0800576
Al Viro40cc51b2008-03-02 10:41:28 -0500577 ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg);
Tejun Heo63972562007-01-02 17:41:04 +0900578 if (ret != -ENOSYS)
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +0200579 goto out;
Christoph Hellwig6a2900b2006-03-23 03:00:15 -0800580
581 /*
582 * ENODEV means that we didn't recognise the ioctl, or that we
583 * cannot execute it in the current device state. In either
584 * case fall through to scsi_ioctl, which will return ENDOEV again
585 * if it doesn't recognise the ioctl
586 */
Al Viro83ff6fe2008-03-02 08:15:49 -0500587 ret = scsi_nonblockable_ioctl(sdev, cmd, argp,
Christoph Hellwigfd4ce1a2008-11-05 14:58:42 +0100588 (mode & FMODE_NDELAY) != 0);
Christoph Hellwig6a2900b2006-03-23 03:00:15 -0800589 if (ret != -ENODEV)
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +0200590 goto out;
591 ret = scsi_ioctl(sdev, cmd, argp);
592
593out:
Arnd Bergmann2a48fc02010-06-02 14:28:52 +0200594 mutex_unlock(&sr_mutex);
Aaron Lu6c7f1e22013-01-23 15:09:31 +0800595 scsi_autopm_put_device(cd->device);
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +0200596 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597}
598
Tejun Heo93aae172010-12-16 17:52:17 +0100599static unsigned int sr_block_check_events(struct gendisk *disk,
600 unsigned int clearing)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601{
602 struct scsi_cd *cd = scsi_cd(disk);
Aaron Lu6c7f1e22013-01-23 15:09:31 +0800603 unsigned int ret;
604
Aaron Lu6f4c8272013-01-23 15:09:32 +0800605 if (atomic_read(&cd->device->disk_events_disable_depth) == 0) {
606 scsi_autopm_get_device(cd->device);
607 ret = cdrom_check_events(&cd->cdi, clearing);
608 scsi_autopm_put_device(cd->device);
609 } else {
610 ret = 0;
611 }
Aaron Lu6c7f1e22013-01-23 15:09:31 +0800612
613 return ret;
Tejun Heo93aae172010-12-16 17:52:17 +0100614}
615
616static int sr_block_revalidate_disk(struct gendisk *disk)
617{
618 struct scsi_cd *cd = scsi_cd(disk);
619 struct scsi_sense_hdr sshdr;
620
Aaron Lu6c7f1e22013-01-23 15:09:31 +0800621 scsi_autopm_get_device(cd->device);
622
Tejun Heo93aae172010-12-16 17:52:17 +0100623 /* if the unit is not ready, nothing more to do */
624 if (scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr))
Aaron Lu6c7f1e22013-01-23 15:09:31 +0800625 goto out;
Tejun Heo93aae172010-12-16 17:52:17 +0100626
627 sr_cd_check(&cd->cdi);
628 get_sectorsize(cd);
Aaron Lu6c7f1e22013-01-23 15:09:31 +0800629out:
630 scsi_autopm_put_device(cd->device);
Tejun Heo93aae172010-12-16 17:52:17 +0100631 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632}
633
Alexey Dobriyan83d5cde2009-09-21 17:01:13 -0700634static const struct block_device_operations sr_bdops =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635{
636 .owner = THIS_MODULE,
Al Viro40cc51b2008-03-02 10:41:28 -0500637 .open = sr_block_open,
638 .release = sr_block_release,
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +0200639 .ioctl = sr_block_ioctl,
Tejun Heo93aae172010-12-16 17:52:17 +0100640 .check_events = sr_block_check_events,
641 .revalidate_disk = sr_block_revalidate_disk,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642 /*
643 * No compat_ioctl for now because sr_block_ioctl never
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300644 * seems to pass arbitrary ioctls down to host drivers.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645 */
646};
647
648static int sr_open(struct cdrom_device_info *cdi, int purpose)
649{
650 struct scsi_cd *cd = cdi->handle;
651 struct scsi_device *sdev = cd->device;
652 int retval;
653
654 /*
655 * If the device is in error recovery, wait until it is done.
656 * If the device is offline, then disallow any access to it.
657 */
658 retval = -ENXIO;
659 if (!scsi_block_when_processing_errors(sdev))
660 goto error_out;
661
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662 return 0;
663
664error_out:
665 return retval;
666}
667
668static void sr_release(struct cdrom_device_info *cdi)
669{
670 struct scsi_cd *cd = cdi->handle;
671
672 if (cd->device->sector_size > 2048)
673 sr_set_blocklength(cd, 2048);
674
675}
676
677static int sr_probe(struct device *dev)
678{
679 struct scsi_device *sdev = to_scsi_device(dev);
680 struct gendisk *disk;
681 struct scsi_cd *cd;
682 int minor, error;
683
684 error = -ENODEV;
685 if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM)
686 goto fail;
687
688 error = -ENOMEM;
Jes Sorensen24669f752006-01-16 10:31:18 -0500689 cd = kzalloc(sizeof(*cd), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690 if (!cd)
691 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692
693 kref_init(&cd->kref);
694
695 disk = alloc_disk(1);
696 if (!disk)
697 goto fail_free;
698
699 spin_lock(&sr_index_lock);
700 minor = find_first_zero_bit(sr_index_bits, SR_DISKS);
701 if (minor == SR_DISKS) {
702 spin_unlock(&sr_index_lock);
703 error = -EBUSY;
704 goto fail_put;
705 }
706 __set_bit(minor, sr_index_bits);
707 spin_unlock(&sr_index_lock);
708
709 disk->major = SCSI_CDROM_MAJOR;
710 disk->first_minor = minor;
711 sprintf(disk->disk_name, "sr%d", minor);
712 disk->fops = &sr_bdops;
Tejun Heod4dc2102011-04-21 20:54:46 +0200713 disk->flags = GENHD_FL_CD | GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE;
Tejun Heo93aae172010-12-16 17:52:17 +0100714 disk->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715
Jens Axboe242f9dc2008-09-14 05:55:09 -0700716 blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT);
717
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718 cd->device = sdev;
719 cd->disk = disk;
720 cd->driver = &sr_template;
721 cd->disk = disk;
722 cd->capacity = 0x1fffff;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723 cd->device->changed = 1; /* force recheck CD type */
Tejun Heo93aae172010-12-16 17:52:17 +0100724 cd->media_present = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725 cd->use = 1;
726 cd->readcd_known = 0;
727 cd->readcd_cdda = 0;
728
729 cd->cdi.ops = &sr_dops;
730 cd->cdi.handle = cd;
731 cd->cdi.mask = 0;
732 cd->cdi.capacity = 1;
733 sprintf(cd->cdi.name, "sr%d", minor);
734
735 sdev->sector_size = 2048; /* A guess, just in case */
736
737 /* FIXME: need to handle a get_capabilities failure properly ?? */
738 get_capabilities(cd);
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500739 blk_queue_prep_rq(sdev->request_queue, sr_prep_fn);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740 sr_vendor_init(cd);
741
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742 disk->driverfs_dev = &sdev->sdev_gendev;
743 set_capacity(disk, cd->capacity);
744 disk->private_data = &cd->driver;
745 disk->queue = sdev->request_queue;
746 cd->cdi.disk = disk;
747
748 if (register_cdrom(&cd->cdi))
749 goto fail_put;
750
751 dev_set_drvdata(dev, cd);
752 disk->flags |= GENHD_FL_REMOVABLE;
753 add_disk(disk);
754
James Bottomley9ccfc752005-10-02 11:45:08 -0500755 sdev_printk(KERN_DEBUG, sdev,
756 "Attached scsi CD-ROM %s\n", cd->cdi.name);
Aaron Lu6c7f1e22013-01-23 15:09:31 +0800757 scsi_autopm_put_device(cd->device);
758
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759 return 0;
760
761fail_put:
762 put_disk(disk);
763fail_free:
764 kfree(cd);
765fail:
766 return error;
767}
768
769
770static void get_sectorsize(struct scsi_cd *cd)
771{
772 unsigned char cmd[10];
FUJITA Tomonori62858da2008-07-04 09:31:50 +0200773 unsigned char buffer[8];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774 int the_result, retries = 3;
775 int sector_size;
Jens Axboe165125e2007-07-24 09:28:11 +0200776 struct request_queue *queue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778 do {
779 cmd[0] = READ_CAPACITY;
780 memset((void *) &cmd[1], 0, 9);
FUJITA Tomonori62858da2008-07-04 09:31:50 +0200781 memset(buffer, 0, sizeof(buffer));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782
783 /* Do the command and wait.. */
James Bottomley820732b2005-06-12 22:21:29 -0500784 the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE,
FUJITA Tomonori62858da2008-07-04 09:31:50 +0200785 buffer, sizeof(buffer), NULL,
FUJITA Tomonorif4f4e472008-12-04 14:24:39 +0900786 SR_TIMEOUT, MAX_RETRIES, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788 retries--;
789
790 } while (the_result && retries);
791
792
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793 if (the_result) {
794 cd->capacity = 0x1fffff;
795 sector_size = 2048; /* A guess, just in case */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796 } else {
Tejun Heo59151362009-09-04 11:38:02 +0900797 long last_written;
798
799 cd->capacity = 1 + ((buffer[0] << 24) | (buffer[1] << 16) |
800 (buffer[2] << 8) | buffer[3]);
801 /*
802 * READ_CAPACITY doesn't return the correct size on
803 * certain UDF media. If last_written is larger, use
804 * it instead.
805 *
806 * http://bugzilla.kernel.org/show_bug.cgi?id=9668
807 */
808 if (!cdrom_get_last_written(&cd->cdi, &last_written))
809 cd->capacity = max_t(long, cd->capacity, last_written);
810
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811 sector_size = (buffer[4] << 24) |
812 (buffer[5] << 16) | (buffer[6] << 8) | buffer[7];
813 switch (sector_size) {
814 /*
815 * HP 4020i CD-Recorder reports 2340 byte sectors
816 * Philips CD-Writers report 2352 byte sectors
817 *
818 * Use 2k sectors for them..
819 */
820 case 0:
821 case 2340:
822 case 2352:
823 sector_size = 2048;
824 /* fall through */
825 case 2048:
826 cd->capacity *= 4;
827 /* fall through */
828 case 512:
829 break;
830 default:
831 printk("%s: unsupported sector size %d.\n",
832 cd->cdi.name, sector_size);
833 cd->capacity = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834 }
835
836 cd->device->sector_size = sector_size;
837
838 /*
839 * Add this so that we have the ability to correctly gauge
840 * what the device is capable of.
841 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842 set_capacity(cd->disk, cd->capacity);
843 }
844
845 queue = cd->device->request_queue;
Martin K. Petersene1defc42009-05-22 17:17:49 -0400846 blk_queue_logical_block_size(queue, sector_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847
FUJITA Tomonori62858da2008-07-04 09:31:50 +0200848 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849}
850
851static void get_capabilities(struct scsi_cd *cd)
852{
853 unsigned char *buffer;
854 struct scsi_mode_data data;
James Bottomley820732b2005-06-12 22:21:29 -0500855 struct scsi_sense_hdr sshdr;
James Bottomley38582a62008-02-06 13:01:58 -0600856 int rc, n;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857
Arjan van de Ven0ad78202005-11-28 16:22:25 +0100858 static const char *loadmech[] =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859 {
860 "caddy",
861 "tray",
862 "pop-up",
863 "",
864 "changer",
865 "cartridge changer",
866 "",
867 ""
868 };
869
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870
871 /* allocate transfer buffer */
872 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
873 if (!buffer) {
874 printk(KERN_ERR "sr: out of memory.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875 return;
876 }
877
James Bottomley38582a62008-02-06 13:01:58 -0600878 /* eat unit attentions */
Tejun Heo9f8a2c22010-12-08 20:57:40 +0100879 scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880
881 /* ask for mode page 0x2a */
882 rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, 128,
James Bottomley1cf72692005-08-28 11:27:01 -0500883 SR_TIMEOUT, 3, &data, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884
885 if (!scsi_status_is_good(rc)) {
886 /* failed, drive doesn't have capabilities mode page */
887 cd->cdi.speed = 1;
888 cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R |
Chuck Ebbertbcc1e382006-01-11 23:58:40 -0500889 CDC_DVD | CDC_DVD_RAM |
890 CDC_SELECT_DISC | CDC_SELECT_SPEED |
891 CDC_MRW | CDC_MRW_W | CDC_RAM);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892 kfree(buffer);
893 printk("%s: scsi-1 drive\n", cd->cdi.name);
894 return;
895 }
896
897 n = data.header_length + data.block_descriptor_length;
898 cd->cdi.speed = ((buffer[n + 8] << 8) + buffer[n + 9]) / 176;
899 cd->readcd_known = 1;
900 cd->readcd_cdda = buffer[n + 5] & 0x01;
901 /* print some capability bits */
902 printk("%s: scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", cd->cdi.name,
903 ((buffer[n + 14] << 8) + buffer[n + 15]) / 176,
904 cd->cdi.speed,
905 buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */
906 buffer[n + 3] & 0x20 ? "dvd-ram " : "",
907 buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */
908 buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */
909 buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */
910 loadmech[buffer[n + 6] >> 5]);
911 if ((buffer[n + 6] >> 5) == 0)
912 /* caddy drives can't close tray... */
913 cd->cdi.mask |= CDC_CLOSE_TRAY;
914 if ((buffer[n + 2] & 0x8) == 0)
915 /* not a DVD drive */
916 cd->cdi.mask |= CDC_DVD;
917 if ((buffer[n + 3] & 0x20) == 0)
918 /* can't write DVD-RAM media */
919 cd->cdi.mask |= CDC_DVD_RAM;
920 if ((buffer[n + 3] & 0x10) == 0)
921 /* can't write DVD-R media */
922 cd->cdi.mask |= CDC_DVD_R;
923 if ((buffer[n + 3] & 0x2) == 0)
924 /* can't write CD-RW media */
925 cd->cdi.mask |= CDC_CD_RW;
926 if ((buffer[n + 3] & 0x1) == 0)
927 /* can't write CD-R media */
928 cd->cdi.mask |= CDC_CD_R;
929 if ((buffer[n + 6] & 0x8) == 0)
930 /* can't eject */
931 cd->cdi.mask |= CDC_OPEN_TRAY;
932
933 if ((buffer[n + 6] >> 5) == mechtype_individual_changer ||
934 (buffer[n + 6] >> 5) == mechtype_cartridge_changer)
935 cd->cdi.capacity =
936 cdrom_number_of_slots(&cd->cdi);
937 if (cd->cdi.capacity <= 1)
938 /* not a changer */
939 cd->cdi.mask |= CDC_SELECT_DISC;
940 /*else I don't think it can close its tray
941 cd->cdi.mask |= CDC_CLOSE_TRAY; */
942
943 /*
944 * if DVD-RAM, MRW-W or CD-RW, we are randomly writable
945 */
946 if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) !=
947 (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) {
948 cd->device->writeable = 1;
949 }
950
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951 kfree(buffer);
952}
953
954/*
955 * sr_packet() is the entry point for the generic commands generated
956 * by the Uniform CD-ROM layer.
957 */
958static int sr_packet(struct cdrom_device_info *cdi,
959 struct packet_command *cgc)
960{
Hans de Goede8e04d802010-10-01 14:20:08 -0700961 struct scsi_cd *cd = cdi->handle;
962 struct scsi_device *sdev = cd->device;
963
964 if (cgc->cmd[0] == GPCMD_READ_DISC_INFO && sdev->no_read_disc_info)
965 return -EDRIVE_CANT_DO_THIS;
966
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967 if (cgc->timeout <= 0)
968 cgc->timeout = IOCTL_TIMEOUT;
969
Hans de Goede8e04d802010-10-01 14:20:08 -0700970 sr_do_ioctl(cd, cgc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971
972 return cgc->stat;
973}
974
975/**
976 * sr_kref_release - Called to free the scsi_cd structure
977 * @kref: pointer to embedded kref
978 *
Arjan van de Ven0b950672006-01-11 13:16:10 +0100979 * sr_ref_mutex must be held entering this routine. Because it is
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980 * called on last put, you should always use the scsi_cd_get()
981 * scsi_cd_put() helpers which manipulate the semaphore directly
982 * and never do a direct kref_put().
983 **/
984static void sr_kref_release(struct kref *kref)
985{
986 struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref);
987 struct gendisk *disk = cd->disk;
988
989 spin_lock(&sr_index_lock);
Tejun Heof331c022008-09-03 09:01:48 +0200990 clear_bit(MINOR(disk_devt(disk)), sr_index_bits);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991 spin_unlock(&sr_index_lock);
992
993 unregister_cdrom(&cd->cdi);
994
995 disk->private_data = NULL;
996
997 put_disk(disk);
998
999 kfree(cd);
1000}
1001
1002static int sr_remove(struct device *dev)
1003{
1004 struct scsi_cd *cd = dev_get_drvdata(dev);
1005
Aaron Lu6c7f1e22013-01-23 15:09:31 +08001006 scsi_autopm_get_device(cd->device);
1007
Hannes Reineckeb3912772009-06-18 09:57:18 +02001008 blk_queue_prep_rq(cd->device->request_queue, scsi_prep_fn);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009 del_gendisk(cd->disk);
1010
Arjan van de Ven0b950672006-01-11 13:16:10 +01001011 mutex_lock(&sr_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012 kref_put(&cd->kref, sr_kref_release);
Arjan van de Ven0b950672006-01-11 13:16:10 +01001013 mutex_unlock(&sr_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001014
1015 return 0;
1016}
1017
1018static int __init init_sr(void)
1019{
1020 int rc;
1021
1022 rc = register_blkdev(SCSI_CDROM_MAJOR, "sr");
1023 if (rc)
1024 return rc;
Akinobu Mitada3962f2007-06-26 00:39:33 +09001025 rc = scsi_register_driver(&sr_template.gendrv);
1026 if (rc)
1027 unregister_blkdev(SCSI_CDROM_MAJOR, "sr");
1028
1029 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001030}
1031
1032static void __exit exit_sr(void)
1033{
1034 scsi_unregister_driver(&sr_template.gendrv);
1035 unregister_blkdev(SCSI_CDROM_MAJOR, "sr");
1036}
1037
1038module_init(init_sr);
1039module_exit(exit_sr);
1040MODULE_LICENSE("GPL");