blob: 7eeb93627beb77f31d00eeb147fc4e44ef6331c5 [file] [log] [blame]
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 *);
Christoph Hellwiga1b73fc2014-05-01 16:51:04 +020082static int sr_init_command(struct scsi_cmnd *SCpnt);
Linus Torvalds7b3d9542008-01-06 10:17:12 -080083static int sr_done(struct scsi_cmnd *);
Aaron Lu6c7f1e22013-01-23 15:09:31 +080084static int sr_runtime_suspend(struct device *dev);
85
86static struct dev_pm_ops sr_pm_ops = {
87 .runtime_suspend = sr_runtime_suspend,
88};
Linus Torvalds1da177e2005-04-16 15:20:36 -070089
90static struct scsi_driver sr_template = {
91 .owner = THIS_MODULE,
92 .gendrv = {
93 .name = "sr",
94 .probe = sr_probe,
95 .remove = sr_remove,
Aaron Lu6c7f1e22013-01-23 15:09:31 +080096 .pm = &sr_pm_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 },
Christoph Hellwiga1b73fc2014-05-01 16:51:04 +020098 .init_command = sr_init_command,
Linus Torvalds7b3d9542008-01-06 10:17:12 -080099 .done = sr_done,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100};
101
102static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG];
103static DEFINE_SPINLOCK(sr_index_lock);
104
105/* This semaphore is used to mediate the 0->1 reference get in the
106 * face of object destruction (i.e. we can't allow a get on an
107 * object after last put) */
Arjan van de Ven0b950672006-01-11 13:16:10 +0100108static DEFINE_MUTEX(sr_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109
110static int sr_open(struct cdrom_device_info *, int);
111static void sr_release(struct cdrom_device_info *);
112
113static void get_sectorsize(struct scsi_cd *);
114static void get_capabilities(struct scsi_cd *);
115
Tejun Heo93aae172010-12-16 17:52:17 +0100116static unsigned int sr_check_events(struct cdrom_device_info *cdi,
117 unsigned int clearing, int slot);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118static int sr_packet(struct cdrom_device_info *, struct packet_command *);
119
120static struct cdrom_device_ops sr_dops = {
121 .open = sr_open,
122 .release = sr_release,
123 .drive_status = sr_drive_status,
Tejun Heo93aae172010-12-16 17:52:17 +0100124 .check_events = sr_check_events,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125 .tray_move = sr_tray_move,
126 .lock_door = sr_lock_door,
127 .select_speed = sr_select_speed,
128 .get_last_session = sr_get_last_session,
129 .get_mcn = sr_get_mcn,
130 .reset = sr_reset,
131 .audio_ioctl = sr_audio_ioctl,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 .capability = SR_CAPABILITIES,
133 .generic_packet = sr_packet,
134};
135
136static void sr_kref_release(struct kref *kref);
137
138static inline struct scsi_cd *scsi_cd(struct gendisk *disk)
139{
140 return container_of(disk->private_data, struct scsi_cd, driver);
141}
142
Aaron Lu6c7f1e22013-01-23 15:09:31 +0800143static int sr_runtime_suspend(struct device *dev)
144{
145 struct scsi_cd *cd = dev_get_drvdata(dev);
146
147 if (cd->media_present)
148 return -EBUSY;
149 else
150 return 0;
151}
152
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153/*
154 * The get and put routines for the struct scsi_cd. Note this entity
155 * has a scsi_device pointer and owns a reference to this.
156 */
157static inline struct scsi_cd *scsi_cd_get(struct gendisk *disk)
158{
159 struct scsi_cd *cd = NULL;
160
Arjan van de Ven0b950672006-01-11 13:16:10 +0100161 mutex_lock(&sr_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 if (disk->private_data == NULL)
163 goto out;
164 cd = scsi_cd(disk);
165 kref_get(&cd->kref);
Aaron Lu6627b382013-10-28 15:27:49 +0800166 if (scsi_device_get(cd->device)) {
167 kref_put(&cd->kref, sr_kref_release);
168 cd = NULL;
169 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 out:
Arjan van de Ven0b950672006-01-11 13:16:10 +0100171 mutex_unlock(&sr_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 return cd;
173}
174
Arjan van de Ven858119e2006-01-14 13:20:43 -0800175static void scsi_cd_put(struct scsi_cd *cd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176{
177 struct scsi_device *sdev = cd->device;
178
Arjan van de Ven0b950672006-01-11 13:16:10 +0100179 mutex_lock(&sr_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 kref_put(&cd->kref, sr_kref_release);
181 scsi_device_put(sdev);
Arjan van de Ven0b950672006-01-11 13:16:10 +0100182 mutex_unlock(&sr_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183}
184
Tejun Heo93aae172010-12-16 17:52:17 +0100185static unsigned int sr_get_events(struct scsi_device *sdev)
186{
187 u8 buf[8];
188 u8 cmd[] = { GET_EVENT_STATUS_NOTIFICATION,
189 1, /* polled */
190 0, 0, /* reserved */
191 1 << 4, /* notification class: media */
192 0, 0, /* reserved */
193 0, sizeof(buf), /* allocation length */
194 0, /* control */
195 };
196 struct event_header *eh = (void *)buf;
197 struct media_event_desc *med = (void *)(buf + 4);
198 struct scsi_sense_hdr sshdr;
199 int result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200
Tejun Heo93aae172010-12-16 17:52:17 +0100201 result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, sizeof(buf),
202 &sshdr, SR_TIMEOUT, MAX_RETRIES, NULL);
203 if (scsi_sense_valid(&sshdr) && sshdr.sense_key == UNIT_ATTENTION)
204 return DISK_EVENT_MEDIA_CHANGE;
205
206 if (result || be16_to_cpu(eh->data_len) < sizeof(*med))
207 return 0;
208
209 if (eh->nea || eh->notification_class != 0x4)
210 return 0;
211
212 if (med->media_event_code == 1)
213 return DISK_EVENT_EJECT_REQUEST;
214 else if (med->media_event_code == 2)
215 return DISK_EVENT_MEDIA_CHANGE;
216 return 0;
217}
218
219/*
220 * This function checks to see if the media has been changed or eject
221 * button has been pressed. It is possible that we have already
222 * sensed a change, or the drive may have sensed one and not yet
223 * reported it. The past events are accumulated in sdev->changed and
224 * returned together with the current state.
225 */
226static unsigned int sr_check_events(struct cdrom_device_info *cdi,
227 unsigned int clearing, int slot)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228{
229 struct scsi_cd *cd = cdi->handle;
Tejun Heo93aae172010-12-16 17:52:17 +0100230 bool last_present;
231 struct scsi_sense_hdr sshdr;
232 unsigned int events;
233 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234
Tejun Heo93aae172010-12-16 17:52:17 +0100235 /* no changer support */
236 if (CDSL_CURRENT != slot)
237 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238
Tejun Heo93aae172010-12-16 17:52:17 +0100239 events = sr_get_events(cd->device);
Kay Sievers79b96772011-06-30 15:03:48 +0200240 cd->get_event_changed |= events & DISK_EVENT_MEDIA_CHANGE;
241
242 /*
243 * If earlier GET_EVENT_STATUS_NOTIFICATION and TUR did not agree
244 * for several times in a row. We rely on TUR only for this likely
245 * broken device, to prevent generating incorrect media changed
246 * events for every open().
247 */
248 if (cd->ignore_get_event) {
249 events &= ~DISK_EVENT_MEDIA_CHANGE;
250 goto do_tur;
251 }
252
Tejun Heo93aae172010-12-16 17:52:17 +0100253 /*
254 * GET_EVENT_STATUS_NOTIFICATION is enough unless MEDIA_CHANGE
255 * is being cleared. Note that there are devices which hang
256 * if asked to execute TUR repeatedly.
257 */
Kay Sievers79b96772011-06-30 15:03:48 +0200258 if (cd->device->changed) {
259 events |= DISK_EVENT_MEDIA_CHANGE;
260 cd->device->changed = 0;
261 cd->tur_changed = true;
262 }
Tejun Heo93aae172010-12-16 17:52:17 +0100263
Kay Sievers79b96772011-06-30 15:03:48 +0200264 if (!(clearing & DISK_EVENT_MEDIA_CHANGE))
265 return events;
266do_tur:
Tejun Heo93aae172010-12-16 17:52:17 +0100267 /* let's see whether the media is there with TUR */
268 last_present = cd->media_present;
269 ret = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr);
270
Tejun Heo638428e2010-12-09 11:18:42 +0100271 /*
272 * Media is considered to be present if TUR succeeds or fails with
273 * sense data indicating something other than media-not-present
274 * (ASC 0x3a).
275 */
Tejun Heo93aae172010-12-16 17:52:17 +0100276 cd->media_present = scsi_status_is_good(ret) ||
277 (scsi_sense_valid(&sshdr) && sshdr.asc != 0x3a);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278
Tejun Heo93aae172010-12-16 17:52:17 +0100279 if (last_present != cd->media_present)
Kay Sievers79b96772011-06-30 15:03:48 +0200280 cd->device->changed = 1;
281
Tejun Heo93aae172010-12-16 17:52:17 +0100282 if (cd->device->changed) {
283 events |= DISK_EVENT_MEDIA_CHANGE;
284 cd->device->changed = 0;
Kay Sievers79b96772011-06-30 15:03:48 +0200285 cd->tur_changed = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 }
Kay Sievers285e9672007-08-14 14:10:39 +0200287
Kay Sievers79b96772011-06-30 15:03:48 +0200288 if (cd->ignore_get_event)
289 return events;
290
291 /* check whether GET_EVENT is reporting spurious MEDIA_CHANGE */
292 if (!cd->tur_changed) {
293 if (cd->get_event_changed) {
294 if (cd->tur_mismatch++ > 8) {
Hannes Reinecke96eefad2014-06-25 16:39:54 +0200295 sr_printk(KERN_WARNING, cd,
296 "GET_EVENT and TUR disagree continuously, suppress GET_EVENT events\n");
Kay Sievers79b96772011-06-30 15:03:48 +0200297 cd->ignore_get_event = true;
298 }
299 } else {
300 cd->tur_mismatch = 0;
301 }
302 }
303 cd->tur_changed = false;
304 cd->get_event_changed = false;
305
Tejun Heo93aae172010-12-16 17:52:17 +0100306 return events;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307}
Tejun Heo93aae172010-12-16 17:52:17 +0100308
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309/*
Linus Torvalds7b3d9542008-01-06 10:17:12 -0800310 * sr_done is the interrupt routine for the device driver.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 *
Linus Torvalds7b3d9542008-01-06 10:17:12 -0800312 * It will be notified on the end of a SCSI read / write, and will take one
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 * of several actions based on success or failure.
314 */
Linus Torvalds7b3d9542008-01-06 10:17:12 -0800315static int sr_done(struct scsi_cmnd *SCpnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316{
317 int result = SCpnt->result;
Boaz Harrosh30b0c372007-12-13 13:47:40 +0200318 int this_count = scsi_bufflen(SCpnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 int good_bytes = (result == 0 ? this_count : 0);
320 int block_sectors = 0;
321 long error_sector;
322 struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk);
323
324#ifdef DEBUG
Hannes Reinecke96eefad2014-06-25 16:39:54 +0200325 scmd_printk(KERN_INFO, SCpnt, "done: %x\n", result);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326#endif
327
328 /*
329 * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial
330 * success. Since this is a relatively rare error condition, no
331 * care is taken to avoid unnecessary additional work such as
332 * memcpy's that could be avoided.
333 */
334 if (driver_byte(result) != 0 && /* An error occurred */
335 (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */
336 switch (SCpnt->sense_buffer[2]) {
337 case MEDIUM_ERROR:
338 case VOLUME_OVERFLOW:
339 case ILLEGAL_REQUEST:
340 if (!(SCpnt->sense_buffer[0] & 0x90))
341 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 error_sector = (SCpnt->sense_buffer[3] << 24) |
343 (SCpnt->sense_buffer[4] << 16) |
344 (SCpnt->sense_buffer[5] << 8) |
345 SCpnt->sense_buffer[6];
346 if (SCpnt->request->bio != NULL)
347 block_sectors =
348 bio_sectors(SCpnt->request->bio);
349 if (block_sectors < 4)
350 block_sectors = 4;
351 if (cd->device->sector_size == 2048)
352 error_sector <<= 2;
353 error_sector &= ~(block_sectors - 1);
Tejun Heo83096eb2009-05-07 22:24:39 +0900354 good_bytes = (error_sector -
355 blk_rq_pos(SCpnt->request)) << 9;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 if (good_bytes < 0 || good_bytes >= this_count)
357 good_bytes = 0;
358 /*
359 * The SCSI specification allows for the value
360 * returned by READ CAPACITY to be up to 75 2K
361 * sectors past the last readable block.
362 * Therefore, if we hit a medium error within the
363 * last 75 2K sectors, we decrease the saved size
364 * value.
365 */
366 if (error_sector < get_capacity(cd->disk) &&
367 cd->capacity - error_sector < 4 * 75)
368 set_capacity(cd->disk, error_sector);
369 break;
370
371 case RECOVERED_ERROR:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 good_bytes = this_count;
373 break;
374
375 default:
376 break;
377 }
378 }
379
Linus Torvalds7b3d9542008-01-06 10:17:12 -0800380 return good_bytes;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381}
382
Christoph Hellwiga1b73fc2014-05-01 16:51:04 +0200383static int sr_init_command(struct scsi_cmnd *SCpnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384{
Jens Axboe242f9dc2008-09-14 05:55:09 -0700385 int block = 0, this_count, s_size;
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500386 struct scsi_cd *cd;
Christoph Hellwiga1b73fc2014-05-01 16:51:04 +0200387 struct request *rq = SCpnt->request;
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500388 int ret;
389
Christoph Hellwig3868cf82014-06-28 11:58:42 +0200390 ret = scsi_init_io(SCpnt, GFP_ATOMIC);
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500391 if (ret != BLKPREP_OK)
392 goto out;
393 SCpnt = rq->special;
394 cd = scsi_cd(rq->rq_disk);
395
396 /* from here on until we're complete, any goto out
397 * is used for a killable error condition */
398 ret = BLKPREP_KILL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399
Hannes Reinecke96eefad2014-06-25 16:39:54 +0200400 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
401 "Doing sr request, block = %d\n", block));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402
403 if (!cd->device || !scsi_device_online(cd->device)) {
Hannes Reinecke96eefad2014-06-25 16:39:54 +0200404 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
405 "Finishing %u sectors\n", blk_rq_sectors(rq)));
406 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
407 "Retry with 0x%p\n", SCpnt));
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500408 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 }
410
411 if (cd->device->changed) {
412 /*
413 * quietly refuse to do anything to a changed disc until the
414 * changed bit has been reset
415 */
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500416 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417 }
418
419 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420 * we do lazy blocksize switching (when reading XA sectors,
421 * see CDROMREADMODE2 ioctl)
422 */
423 s_size = cd->device->sector_size;
424 if (s_size > 2048) {
425 if (!in_interrupt())
426 sr_set_blocklength(cd, 2048);
427 else
Hannes Reinecke96eefad2014-06-25 16:39:54 +0200428 scmd_printk(KERN_INFO, SCpnt,
429 "can't switch blocksize: in interrupt\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 }
431
432 if (s_size != 512 && s_size != 1024 && s_size != 2048) {
Jeff Garzik3bf743e2005-10-24 18:04:06 -0400433 scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size);
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500434 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 }
436
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500437 if (rq_data_dir(rq) == WRITE) {
Christoph Hellwigfd2eb902014-07-18 16:59:19 +0200438 if (!cd->writeable)
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500439 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440 SCpnt->cmnd[0] = WRITE_10;
Hannes Reinecke96eefad2014-06-25 16:39:54 +0200441 cd->cdi.media_written = 1;
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500442 } else if (rq_data_dir(rq) == READ) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 SCpnt->cmnd[0] = READ_10;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 } else {
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500445 blk_dump_rq_flags(rq, "Unknown sr command");
446 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 }
448
449 {
Boaz Harrosh30b0c372007-12-13 13:47:40 +0200450 struct scatterlist *sg;
451 int i, size = 0, sg_count = scsi_sg_count(SCpnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452
Boaz Harrosh30b0c372007-12-13 13:47:40 +0200453 scsi_for_each_sg(SCpnt, sg, sg_count, i)
454 size += sg->length;
455
456 if (size != scsi_bufflen(SCpnt)) {
Jeff Garzik3bf743e2005-10-24 18:04:06 -0400457 scmd_printk(KERN_ERR, SCpnt,
458 "mismatch count %d, bytes %d\n",
Boaz Harrosh30b0c372007-12-13 13:47:40 +0200459 size, scsi_bufflen(SCpnt));
460 if (scsi_bufflen(SCpnt) > size)
461 SCpnt->sdb.length = size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462 }
463 }
464
465 /*
466 * request doesn't start on hw block boundary, add scatter pads
467 */
Tejun Heo83096eb2009-05-07 22:24:39 +0900468 if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) ||
Boaz Harrosh30b0c372007-12-13 13:47:40 +0200469 (scsi_bufflen(SCpnt) % s_size)) {
Jeff Garzik3bf743e2005-10-24 18:04:06 -0400470 scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n");
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500471 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472 }
473
Boaz Harrosh30b0c372007-12-13 13:47:40 +0200474 this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475
476
Hannes Reinecke96eefad2014-06-25 16:39:54 +0200477 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
478 "%s %d/%u 512 byte blocks.\n",
479 (rq_data_dir(rq) == WRITE) ?
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 "writing" : "reading",
Hannes Reinecke96eefad2014-06-25 16:39:54 +0200481 this_count, blk_rq_sectors(rq)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482
483 SCpnt->cmnd[1] = 0;
Tejun Heo83096eb2009-05-07 22:24:39 +0900484 block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485
486 if (this_count > 0xffff) {
487 this_count = 0xffff;
Boaz Harrosh30b0c372007-12-13 13:47:40 +0200488 SCpnt->sdb.length = this_count * s_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 }
490
491 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
492 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
493 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
494 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
495 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
496 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
497 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
498
499 /*
500 * We shouldn't disconnect in the middle of a sector, so with a dumb
501 * host adapter, it's safe to assume that we can at least transfer
502 * this many bytes between each connect / disconnect.
503 */
504 SCpnt->transfersize = cd->device->sector_size;
505 SCpnt->underflow = this_count << 9;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 SCpnt->allowed = MAX_RETRIES;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507
508 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509 * This indicates that the command is ready from our end to be
510 * queued.
511 */
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500512 ret = BLKPREP_OK;
513 out:
Christoph Hellwiga1b73fc2014-05-01 16:51:04 +0200514 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515}
516
Al Viro40cc51b2008-03-02 10:41:28 -0500517static int sr_block_open(struct block_device *bdev, fmode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518{
Arnd Bergmann6e9624b2010-08-07 18:25:34 +0200519 struct scsi_cd *cd;
Al Viro40cc51b2008-03-02 10:41:28 -0500520 int ret = -ENXIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521
Arnd Bergmann2a48fc02010-06-02 14:28:52 +0200522 mutex_lock(&sr_mutex);
Arnd Bergmann6e9624b2010-08-07 18:25:34 +0200523 cd = scsi_cd_get(bdev->bd_disk);
Al Viro40cc51b2008-03-02 10:41:28 -0500524 if (cd) {
525 ret = cdrom_open(&cd->cdi, bdev, mode);
526 if (ret)
527 scsi_cd_put(cd);
528 }
Arnd Bergmann2a48fc02010-06-02 14:28:52 +0200529 mutex_unlock(&sr_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530 return ret;
531}
532
Al Virodb2a1442013-05-05 21:52:57 -0400533static void sr_block_release(struct gendisk *disk, fmode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534{
Al Viro40cc51b2008-03-02 10:41:28 -0500535 struct scsi_cd *cd = scsi_cd(disk);
Arnd Bergmann2a48fc02010-06-02 14:28:52 +0200536 mutex_lock(&sr_mutex);
Al Viro40cc51b2008-03-02 10:41:28 -0500537 cdrom_release(&cd->cdi, mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538 scsi_cd_put(cd);
Arnd Bergmann2a48fc02010-06-02 14:28:52 +0200539 mutex_unlock(&sr_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540}
541
Al Viro40cc51b2008-03-02 10:41:28 -0500542static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 unsigned long arg)
544{
Al Viro40cc51b2008-03-02 10:41:28 -0500545 struct scsi_cd *cd = scsi_cd(bdev->bd_disk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 struct scsi_device *sdev = cd->device;
Christoph Hellwig6a2900b2006-03-23 03:00:15 -0800547 void __user *argp = (void __user *)arg;
548 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549
Arnd Bergmann2a48fc02010-06-02 14:28:52 +0200550 mutex_lock(&sr_mutex);
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +0200551
Christoph Hellwig6a2900b2006-03-23 03:00:15 -0800552 /*
553 * Send SCSI addressing ioctls directly to mid level, send other
554 * ioctls to cdrom/block level.
555 */
556 switch (cmd) {
557 case SCSI_IOCTL_GET_IDLUN:
558 case SCSI_IOCTL_GET_BUS_NUMBER:
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +0200559 ret = scsi_ioctl(sdev, cmd, argp);
560 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561 }
Christoph Hellwig6a2900b2006-03-23 03:00:15 -0800562
Al Viro40cc51b2008-03-02 10:41:28 -0500563 ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg);
Tejun Heo63972562007-01-02 17:41:04 +0900564 if (ret != -ENOSYS)
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +0200565 goto out;
Christoph Hellwig6a2900b2006-03-23 03:00:15 -0800566
567 /*
568 * ENODEV means that we didn't recognise the ioctl, or that we
569 * cannot execute it in the current device state. In either
570 * case fall through to scsi_ioctl, which will return ENDOEV again
571 * if it doesn't recognise the ioctl
572 */
Al Viro83ff6fe2008-03-02 08:15:49 -0500573 ret = scsi_nonblockable_ioctl(sdev, cmd, argp,
Christoph Hellwigfd4ce1a2008-11-05 14:58:42 +0100574 (mode & FMODE_NDELAY) != 0);
Christoph Hellwig6a2900b2006-03-23 03:00:15 -0800575 if (ret != -ENODEV)
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +0200576 goto out;
577 ret = scsi_ioctl(sdev, cmd, argp);
578
579out:
Arnd Bergmann2a48fc02010-06-02 14:28:52 +0200580 mutex_unlock(&sr_mutex);
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +0200581 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582}
583
Tejun Heo93aae172010-12-16 17:52:17 +0100584static unsigned int sr_block_check_events(struct gendisk *disk,
585 unsigned int clearing)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586{
587 struct scsi_cd *cd = scsi_cd(disk);
Aaron Lu6c7f1e22013-01-23 15:09:31 +0800588
Aaron Lu6627b382013-10-28 15:27:49 +0800589 if (atomic_read(&cd->device->disk_events_disable_depth))
590 return 0;
Aaron Lu6c7f1e22013-01-23 15:09:31 +0800591
Aaron Lu6627b382013-10-28 15:27:49 +0800592 return cdrom_check_events(&cd->cdi, clearing);
Tejun Heo93aae172010-12-16 17:52:17 +0100593}
594
595static int sr_block_revalidate_disk(struct gendisk *disk)
596{
597 struct scsi_cd *cd = scsi_cd(disk);
598 struct scsi_sense_hdr sshdr;
599
600 /* if the unit is not ready, nothing more to do */
601 if (scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr))
Aaron Lu6c7f1e22013-01-23 15:09:31 +0800602 goto out;
Tejun Heo93aae172010-12-16 17:52:17 +0100603
604 sr_cd_check(&cd->cdi);
605 get_sectorsize(cd);
Aaron Lu6c7f1e22013-01-23 15:09:31 +0800606out:
Tejun Heo93aae172010-12-16 17:52:17 +0100607 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608}
609
Alexey Dobriyan83d5cde2009-09-21 17:01:13 -0700610static const struct block_device_operations sr_bdops =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611{
612 .owner = THIS_MODULE,
Al Viro40cc51b2008-03-02 10:41:28 -0500613 .open = sr_block_open,
614 .release = sr_block_release,
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +0200615 .ioctl = sr_block_ioctl,
Tejun Heo93aae172010-12-16 17:52:17 +0100616 .check_events = sr_block_check_events,
617 .revalidate_disk = sr_block_revalidate_disk,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618 /*
619 * No compat_ioctl for now because sr_block_ioctl never
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300620 * seems to pass arbitrary ioctls down to host drivers.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621 */
622};
623
624static int sr_open(struct cdrom_device_info *cdi, int purpose)
625{
626 struct scsi_cd *cd = cdi->handle;
627 struct scsi_device *sdev = cd->device;
628 int retval;
629
630 /*
631 * If the device is in error recovery, wait until it is done.
632 * If the device is offline, then disallow any access to it.
633 */
634 retval = -ENXIO;
635 if (!scsi_block_when_processing_errors(sdev))
636 goto error_out;
637
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638 return 0;
639
640error_out:
641 return retval;
642}
643
644static void sr_release(struct cdrom_device_info *cdi)
645{
646 struct scsi_cd *cd = cdi->handle;
647
648 if (cd->device->sector_size > 2048)
649 sr_set_blocklength(cd, 2048);
650
651}
652
653static int sr_probe(struct device *dev)
654{
655 struct scsi_device *sdev = to_scsi_device(dev);
656 struct gendisk *disk;
657 struct scsi_cd *cd;
658 int minor, error;
659
660 error = -ENODEV;
661 if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM)
662 goto fail;
663
664 error = -ENOMEM;
Jes Sorensen24669f752006-01-16 10:31:18 -0500665 cd = kzalloc(sizeof(*cd), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666 if (!cd)
667 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668
669 kref_init(&cd->kref);
670
671 disk = alloc_disk(1);
672 if (!disk)
673 goto fail_free;
674
675 spin_lock(&sr_index_lock);
676 minor = find_first_zero_bit(sr_index_bits, SR_DISKS);
677 if (minor == SR_DISKS) {
678 spin_unlock(&sr_index_lock);
679 error = -EBUSY;
680 goto fail_put;
681 }
682 __set_bit(minor, sr_index_bits);
683 spin_unlock(&sr_index_lock);
684
685 disk->major = SCSI_CDROM_MAJOR;
686 disk->first_minor = minor;
687 sprintf(disk->disk_name, "sr%d", minor);
688 disk->fops = &sr_bdops;
Tejun Heod4dc2102011-04-21 20:54:46 +0200689 disk->flags = GENHD_FL_CD | GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE;
Tejun Heo93aae172010-12-16 17:52:17 +0100690 disk->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691
Jens Axboe242f9dc2008-09-14 05:55:09 -0700692 blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT);
693
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694 cd->device = sdev;
695 cd->disk = disk;
696 cd->driver = &sr_template;
697 cd->disk = disk;
698 cd->capacity = 0x1fffff;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699 cd->device->changed = 1; /* force recheck CD type */
Tejun Heo93aae172010-12-16 17:52:17 +0100700 cd->media_present = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701 cd->use = 1;
702 cd->readcd_known = 0;
703 cd->readcd_cdda = 0;
704
705 cd->cdi.ops = &sr_dops;
706 cd->cdi.handle = cd;
707 cd->cdi.mask = 0;
708 cd->cdi.capacity = 1;
709 sprintf(cd->cdi.name, "sr%d", minor);
710
711 sdev->sector_size = 2048; /* A guess, just in case */
712
713 /* FIXME: need to handle a get_capabilities failure properly ?? */
714 get_capabilities(cd);
715 sr_vendor_init(cd);
716
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717 disk->driverfs_dev = &sdev->sdev_gendev;
718 set_capacity(disk, cd->capacity);
719 disk->private_data = &cd->driver;
720 disk->queue = sdev->request_queue;
721 cd->cdi.disk = disk;
722
723 if (register_cdrom(&cd->cdi))
724 goto fail_put;
725
Aaron Lu6627b382013-10-28 15:27:49 +0800726 /*
727 * Initialize block layer runtime PM stuffs before the
728 * periodic event checking request gets started in add_disk.
729 */
730 blk_pm_runtime_init(sdev->request_queue, dev);
731
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732 dev_set_drvdata(dev, cd);
733 disk->flags |= GENHD_FL_REMOVABLE;
734 add_disk(disk);
735
James Bottomley9ccfc752005-10-02 11:45:08 -0500736 sdev_printk(KERN_DEBUG, sdev,
737 "Attached scsi CD-ROM %s\n", cd->cdi.name);
Aaron Lu6c7f1e22013-01-23 15:09:31 +0800738 scsi_autopm_put_device(cd->device);
739
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740 return 0;
741
742fail_put:
743 put_disk(disk);
744fail_free:
745 kfree(cd);
746fail:
747 return error;
748}
749
750
751static void get_sectorsize(struct scsi_cd *cd)
752{
753 unsigned char cmd[10];
FUJITA Tomonori62858da2008-07-04 09:31:50 +0200754 unsigned char buffer[8];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755 int the_result, retries = 3;
756 int sector_size;
Jens Axboe165125e2007-07-24 09:28:11 +0200757 struct request_queue *queue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759 do {
760 cmd[0] = READ_CAPACITY;
761 memset((void *) &cmd[1], 0, 9);
FUJITA Tomonori62858da2008-07-04 09:31:50 +0200762 memset(buffer, 0, sizeof(buffer));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763
764 /* Do the command and wait.. */
James Bottomley820732b2005-06-12 22:21:29 -0500765 the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE,
FUJITA Tomonori62858da2008-07-04 09:31:50 +0200766 buffer, sizeof(buffer), NULL,
FUJITA Tomonorif4f4e472008-12-04 14:24:39 +0900767 SR_TIMEOUT, MAX_RETRIES, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769 retries--;
770
771 } while (the_result && retries);
772
773
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774 if (the_result) {
775 cd->capacity = 0x1fffff;
776 sector_size = 2048; /* A guess, just in case */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777 } else {
Tejun Heo59151362009-09-04 11:38:02 +0900778 long last_written;
779
780 cd->capacity = 1 + ((buffer[0] << 24) | (buffer[1] << 16) |
781 (buffer[2] << 8) | buffer[3]);
782 /*
783 * READ_CAPACITY doesn't return the correct size on
784 * certain UDF media. If last_written is larger, use
785 * it instead.
786 *
787 * http://bugzilla.kernel.org/show_bug.cgi?id=9668
788 */
789 if (!cdrom_get_last_written(&cd->cdi, &last_written))
790 cd->capacity = max_t(long, cd->capacity, last_written);
791
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792 sector_size = (buffer[4] << 24) |
793 (buffer[5] << 16) | (buffer[6] << 8) | buffer[7];
794 switch (sector_size) {
795 /*
796 * HP 4020i CD-Recorder reports 2340 byte sectors
797 * Philips CD-Writers report 2352 byte sectors
798 *
799 * Use 2k sectors for them..
800 */
801 case 0:
802 case 2340:
803 case 2352:
804 sector_size = 2048;
805 /* fall through */
806 case 2048:
807 cd->capacity *= 4;
808 /* fall through */
809 case 512:
810 break;
811 default:
Hannes Reinecke96eefad2014-06-25 16:39:54 +0200812 sr_printk(KERN_INFO, cd,
813 "unsupported sector size %d.", sector_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814 cd->capacity = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815 }
816
817 cd->device->sector_size = sector_size;
818
819 /*
820 * Add this so that we have the ability to correctly gauge
821 * what the device is capable of.
822 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823 set_capacity(cd->disk, cd->capacity);
824 }
825
826 queue = cd->device->request_queue;
Martin K. Petersene1defc42009-05-22 17:17:49 -0400827 blk_queue_logical_block_size(queue, sector_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828
FUJITA Tomonori62858da2008-07-04 09:31:50 +0200829 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830}
831
832static void get_capabilities(struct scsi_cd *cd)
833{
834 unsigned char *buffer;
835 struct scsi_mode_data data;
James Bottomley820732b2005-06-12 22:21:29 -0500836 struct scsi_sense_hdr sshdr;
James Bottomley38582a62008-02-06 13:01:58 -0600837 int rc, n;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838
Arjan van de Ven0ad78202005-11-28 16:22:25 +0100839 static const char *loadmech[] =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840 {
841 "caddy",
842 "tray",
843 "pop-up",
844 "",
845 "changer",
846 "cartridge changer",
847 "",
848 ""
849 };
850
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851
852 /* allocate transfer buffer */
853 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
854 if (!buffer) {
Hannes Reinecke96eefad2014-06-25 16:39:54 +0200855 sr_printk(KERN_ERR, cd, "out of memory.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856 return;
857 }
858
James Bottomley38582a62008-02-06 13:01:58 -0600859 /* eat unit attentions */
Tejun Heo9f8a2c22010-12-08 20:57:40 +0100860 scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861
862 /* ask for mode page 0x2a */
863 rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, 128,
James Bottomley1cf72692005-08-28 11:27:01 -0500864 SR_TIMEOUT, 3, &data, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865
866 if (!scsi_status_is_good(rc)) {
867 /* failed, drive doesn't have capabilities mode page */
868 cd->cdi.speed = 1;
869 cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R |
Chuck Ebbertbcc1e382006-01-11 23:58:40 -0500870 CDC_DVD | CDC_DVD_RAM |
871 CDC_SELECT_DISC | CDC_SELECT_SPEED |
872 CDC_MRW | CDC_MRW_W | CDC_RAM);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873 kfree(buffer);
Hannes Reinecke96eefad2014-06-25 16:39:54 +0200874 sr_printk(KERN_INFO, cd, "scsi-1 drive");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875 return;
876 }
877
878 n = data.header_length + data.block_descriptor_length;
879 cd->cdi.speed = ((buffer[n + 8] << 8) + buffer[n + 9]) / 176;
880 cd->readcd_known = 1;
881 cd->readcd_cdda = buffer[n + 5] & 0x01;
882 /* print some capability bits */
Hannes Reinecke96eefad2014-06-25 16:39:54 +0200883 sr_printk(KERN_INFO, cd,
884 "scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n",
885 ((buffer[n + 14] << 8) + buffer[n + 15]) / 176,
886 cd->cdi.speed,
887 buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */
888 buffer[n + 3] & 0x20 ? "dvd-ram " : "",
889 buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */
890 buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */
891 buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */
892 loadmech[buffer[n + 6] >> 5]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893 if ((buffer[n + 6] >> 5) == 0)
894 /* caddy drives can't close tray... */
895 cd->cdi.mask |= CDC_CLOSE_TRAY;
896 if ((buffer[n + 2] & 0x8) == 0)
897 /* not a DVD drive */
898 cd->cdi.mask |= CDC_DVD;
Hannes Reinecke96eefad2014-06-25 16:39:54 +0200899 if ((buffer[n + 3] & 0x20) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900 /* can't write DVD-RAM media */
901 cd->cdi.mask |= CDC_DVD_RAM;
902 if ((buffer[n + 3] & 0x10) == 0)
903 /* can't write DVD-R media */
904 cd->cdi.mask |= CDC_DVD_R;
905 if ((buffer[n + 3] & 0x2) == 0)
906 /* can't write CD-RW media */
907 cd->cdi.mask |= CDC_CD_RW;
908 if ((buffer[n + 3] & 0x1) == 0)
909 /* can't write CD-R media */
910 cd->cdi.mask |= CDC_CD_R;
911 if ((buffer[n + 6] & 0x8) == 0)
912 /* can't eject */
913 cd->cdi.mask |= CDC_OPEN_TRAY;
914
915 if ((buffer[n + 6] >> 5) == mechtype_individual_changer ||
916 (buffer[n + 6] >> 5) == mechtype_cartridge_changer)
917 cd->cdi.capacity =
918 cdrom_number_of_slots(&cd->cdi);
919 if (cd->cdi.capacity <= 1)
920 /* not a changer */
921 cd->cdi.mask |= CDC_SELECT_DISC;
922 /*else I don't think it can close its tray
923 cd->cdi.mask |= CDC_CLOSE_TRAY; */
924
925 /*
926 * if DVD-RAM, MRW-W or CD-RW, we are randomly writable
927 */
928 if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) !=
929 (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) {
Christoph Hellwigfd2eb902014-07-18 16:59:19 +0200930 cd->writeable = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931 }
932
Linus Torvalds1da177e2005-04-16 15:20:36 -0700933 kfree(buffer);
934}
935
936/*
937 * sr_packet() is the entry point for the generic commands generated
Hannes Reinecke96eefad2014-06-25 16:39:54 +0200938 * by the Uniform CD-ROM layer.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700939 */
940static int sr_packet(struct cdrom_device_info *cdi,
941 struct packet_command *cgc)
942{
Hans de Goede8e04d802010-10-01 14:20:08 -0700943 struct scsi_cd *cd = cdi->handle;
944 struct scsi_device *sdev = cd->device;
945
946 if (cgc->cmd[0] == GPCMD_READ_DISC_INFO && sdev->no_read_disc_info)
947 return -EDRIVE_CANT_DO_THIS;
948
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949 if (cgc->timeout <= 0)
950 cgc->timeout = IOCTL_TIMEOUT;
951
Hans de Goede8e04d802010-10-01 14:20:08 -0700952 sr_do_ioctl(cd, cgc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953
954 return cgc->stat;
955}
956
957/**
958 * sr_kref_release - Called to free the scsi_cd structure
959 * @kref: pointer to embedded kref
960 *
Arjan van de Ven0b950672006-01-11 13:16:10 +0100961 * sr_ref_mutex must be held entering this routine. Because it is
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962 * called on last put, you should always use the scsi_cd_get()
963 * scsi_cd_put() helpers which manipulate the semaphore directly
964 * and never do a direct kref_put().
965 **/
966static void sr_kref_release(struct kref *kref)
967{
968 struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref);
969 struct gendisk *disk = cd->disk;
970
971 spin_lock(&sr_index_lock);
Tejun Heof331c022008-09-03 09:01:48 +0200972 clear_bit(MINOR(disk_devt(disk)), sr_index_bits);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973 spin_unlock(&sr_index_lock);
974
975 unregister_cdrom(&cd->cdi);
976
977 disk->private_data = NULL;
978
979 put_disk(disk);
980
981 kfree(cd);
982}
983
984static int sr_remove(struct device *dev)
985{
986 struct scsi_cd *cd = dev_get_drvdata(dev);
987
Aaron Lu6c7f1e22013-01-23 15:09:31 +0800988 scsi_autopm_get_device(cd->device);
989
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990 del_gendisk(cd->disk);
991
Arjan van de Ven0b950672006-01-11 13:16:10 +0100992 mutex_lock(&sr_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700993 kref_put(&cd->kref, sr_kref_release);
Arjan van de Ven0b950672006-01-11 13:16:10 +0100994 mutex_unlock(&sr_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700995
996 return 0;
997}
998
999static int __init init_sr(void)
1000{
1001 int rc;
1002
1003 rc = register_blkdev(SCSI_CDROM_MAJOR, "sr");
1004 if (rc)
1005 return rc;
Akinobu Mitada3962f2007-06-26 00:39:33 +09001006 rc = scsi_register_driver(&sr_template.gendrv);
1007 if (rc)
1008 unregister_blkdev(SCSI_CDROM_MAJOR, "sr");
1009
1010 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011}
1012
1013static void __exit exit_sr(void)
1014{
1015 scsi_unregister_driver(&sr_template.gendrv);
1016 unregister_blkdev(SCSI_CDROM_MAJOR, "sr");
1017}
1018
1019module_init(init_sr);
1020module_exit(exit_sr);
1021MODULE_LICENSE("GPL");