917 строки
23 KiB
C
917 строки
23 KiB
C
/*
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* sr.c Copyright (C) 1992 David Giller
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* Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
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*
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* adapted from:
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* sd.c Copyright (C) 1992 Drew Eckhardt
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* Linux scsi disk driver by
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* Drew Eckhardt <drew@colorado.edu>
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*
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* Modified by Eric Youngdale ericy@andante.org to
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* add scatter-gather, multiple outstanding request, and other
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* enhancements.
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*
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* Modified by Eric Youngdale eric@andante.org to support loadable
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* low-level scsi drivers.
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*
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* Modified by Thomas Quinot thomas@melchior.cuivre.fdn.fr to
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* provide auto-eject.
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*
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* Modified by Gerd Knorr <kraxel@cs.tu-berlin.de> to support the
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* generic cdrom interface
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*
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* Modified by Jens Axboe <axboe@suse.de> - Uniform sr_packet()
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* interface, capabilities probe additions, ioctl cleanups, etc.
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*
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* Modified by Richard Gooch <rgooch@atnf.csiro.au> to support devfs
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*
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* Modified by Jens Axboe <axboe@suse.de> - support DVD-RAM
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* transparently and lose the GHOST hack
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*
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* Modified by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
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* check resource allocation in sr_init and some cleanups
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*/
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/bio.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/cdrom.h>
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#include <linux/interrupt.h>
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#include <linux/init.h>
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#include <linux/blkdev.h>
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#include <linux/mutex.h>
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#include <asm/uaccess.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_dbg.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_driver.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_eh.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi_ioctl.h> /* For the door lock/unlock commands */
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#include "scsi_logging.h"
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#include "sr.h"
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MODULE_DESCRIPTION("SCSI cdrom (sr) driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_CDROM_MAJOR);
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MODULE_ALIAS_SCSI_DEVICE(TYPE_ROM);
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MODULE_ALIAS_SCSI_DEVICE(TYPE_WORM);
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#define SR_DISKS 256
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#define SR_CAPABILITIES \
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(CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|CDC_SELECT_SPEED| \
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CDC_SELECT_DISC|CDC_MULTI_SESSION|CDC_MCN|CDC_MEDIA_CHANGED| \
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CDC_PLAY_AUDIO|CDC_RESET|CDC_DRIVE_STATUS| \
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CDC_CD_R|CDC_CD_RW|CDC_DVD|CDC_DVD_R|CDC_DVD_RAM|CDC_GENERIC_PACKET| \
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CDC_MRW|CDC_MRW_W|CDC_RAM)
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static int sr_probe(struct device *);
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static int sr_remove(struct device *);
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static int sr_done(struct scsi_cmnd *);
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static struct scsi_driver sr_template = {
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.owner = THIS_MODULE,
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.gendrv = {
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.name = "sr",
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.probe = sr_probe,
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.remove = sr_remove,
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},
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.done = sr_done,
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};
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static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG];
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static DEFINE_SPINLOCK(sr_index_lock);
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/* This semaphore is used to mediate the 0->1 reference get in the
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* face of object destruction (i.e. we can't allow a get on an
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* object after last put) */
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static DEFINE_MUTEX(sr_ref_mutex);
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static int sr_open(struct cdrom_device_info *, int);
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static void sr_release(struct cdrom_device_info *);
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static void get_sectorsize(struct scsi_cd *);
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static void get_capabilities(struct scsi_cd *);
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static int sr_media_change(struct cdrom_device_info *, int);
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static int sr_packet(struct cdrom_device_info *, struct packet_command *);
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static struct cdrom_device_ops sr_dops = {
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.open = sr_open,
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.release = sr_release,
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.drive_status = sr_drive_status,
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.media_changed = sr_media_change,
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.tray_move = sr_tray_move,
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.lock_door = sr_lock_door,
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.select_speed = sr_select_speed,
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.get_last_session = sr_get_last_session,
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.get_mcn = sr_get_mcn,
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.reset = sr_reset,
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.audio_ioctl = sr_audio_ioctl,
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.capability = SR_CAPABILITIES,
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.generic_packet = sr_packet,
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};
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static void sr_kref_release(struct kref *kref);
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static inline struct scsi_cd *scsi_cd(struct gendisk *disk)
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{
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return container_of(disk->private_data, struct scsi_cd, driver);
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}
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/*
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* The get and put routines for the struct scsi_cd. Note this entity
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* has a scsi_device pointer and owns a reference to this.
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*/
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static inline struct scsi_cd *scsi_cd_get(struct gendisk *disk)
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{
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struct scsi_cd *cd = NULL;
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mutex_lock(&sr_ref_mutex);
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if (disk->private_data == NULL)
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goto out;
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cd = scsi_cd(disk);
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kref_get(&cd->kref);
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if (scsi_device_get(cd->device))
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goto out_put;
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goto out;
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out_put:
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kref_put(&cd->kref, sr_kref_release);
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cd = NULL;
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out:
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mutex_unlock(&sr_ref_mutex);
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return cd;
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}
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static void scsi_cd_put(struct scsi_cd *cd)
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{
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struct scsi_device *sdev = cd->device;
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mutex_lock(&sr_ref_mutex);
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kref_put(&cd->kref, sr_kref_release);
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scsi_device_put(sdev);
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mutex_unlock(&sr_ref_mutex);
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}
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/* identical to scsi_test_unit_ready except that it doesn't
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* eat the NOT_READY returns for removable media */
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int sr_test_unit_ready(struct scsi_device *sdev, struct scsi_sense_hdr *sshdr)
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{
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int retries = MAX_RETRIES;
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int the_result;
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u8 cmd[] = {TEST_UNIT_READY, 0, 0, 0, 0, 0 };
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/* issue TEST_UNIT_READY until the initial startup UNIT_ATTENTION
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* conditions are gone, or a timeout happens
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*/
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do {
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the_result = scsi_execute_req(sdev, cmd, DMA_NONE, NULL,
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0, sshdr, SR_TIMEOUT,
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retries--, NULL);
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if (scsi_sense_valid(sshdr) &&
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sshdr->sense_key == UNIT_ATTENTION)
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sdev->changed = 1;
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} while (retries > 0 &&
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(!scsi_status_is_good(the_result) ||
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(scsi_sense_valid(sshdr) &&
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sshdr->sense_key == UNIT_ATTENTION)));
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return the_result;
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}
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/*
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* This function checks to see if the media has been changed in the
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* CDROM drive. It is possible that we have already sensed a change,
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* or the drive may have sensed one and not yet reported it. We must
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* be ready for either case. This function always reports the current
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* value of the changed bit. If flag is 0, then the changed bit is reset.
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* This function could be done as an ioctl, but we would need to have
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* an inode for that to work, and we do not always have one.
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*/
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static int sr_media_change(struct cdrom_device_info *cdi, int slot)
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{
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struct scsi_cd *cd = cdi->handle;
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int retval;
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struct scsi_sense_hdr *sshdr;
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if (CDSL_CURRENT != slot) {
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/* no changer support */
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return -EINVAL;
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}
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sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
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retval = sr_test_unit_ready(cd->device, sshdr);
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if (retval || (scsi_sense_valid(sshdr) &&
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/* 0x3a is medium not present */
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sshdr->asc == 0x3a)) {
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/* Media not present or unable to test, unit probably not
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* ready. This usually means there is no disc in the drive.
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* Mark as changed, and we will figure it out later once
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* the drive is available again.
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*/
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cd->device->changed = 1;
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/* This will force a flush, if called from check_disk_change */
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retval = 1;
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goto out;
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};
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retval = cd->device->changed;
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cd->device->changed = 0;
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/* If the disk changed, the capacity will now be different,
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* so we force a re-read of this information */
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if (retval) {
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/* check multisession offset etc */
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sr_cd_check(cdi);
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get_sectorsize(cd);
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}
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out:
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/* Notify userspace, that media has changed. */
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if (retval != cd->previous_state)
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sdev_evt_send_simple(cd->device, SDEV_EVT_MEDIA_CHANGE,
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GFP_KERNEL);
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cd->previous_state = retval;
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kfree(sshdr);
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return retval;
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}
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/*
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* sr_done is the interrupt routine for the device driver.
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*
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* It will be notified on the end of a SCSI read / write, and will take one
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* of several actions based on success or failure.
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*/
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static int sr_done(struct scsi_cmnd *SCpnt)
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{
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int result = SCpnt->result;
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int this_count = scsi_bufflen(SCpnt);
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int good_bytes = (result == 0 ? this_count : 0);
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int block_sectors = 0;
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long error_sector;
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struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk);
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#ifdef DEBUG
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printk("sr.c done: %x\n", result);
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#endif
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/*
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* Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial
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* success. Since this is a relatively rare error condition, no
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* care is taken to avoid unnecessary additional work such as
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* memcpy's that could be avoided.
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*/
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if (driver_byte(result) != 0 && /* An error occurred */
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(SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */
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switch (SCpnt->sense_buffer[2]) {
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case MEDIUM_ERROR:
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case VOLUME_OVERFLOW:
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case ILLEGAL_REQUEST:
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if (!(SCpnt->sense_buffer[0] & 0x90))
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break;
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error_sector = (SCpnt->sense_buffer[3] << 24) |
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(SCpnt->sense_buffer[4] << 16) |
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(SCpnt->sense_buffer[5] << 8) |
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SCpnt->sense_buffer[6];
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if (SCpnt->request->bio != NULL)
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block_sectors =
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bio_sectors(SCpnt->request->bio);
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if (block_sectors < 4)
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block_sectors = 4;
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if (cd->device->sector_size == 2048)
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error_sector <<= 2;
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error_sector &= ~(block_sectors - 1);
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good_bytes = (error_sector -
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blk_rq_pos(SCpnt->request)) << 9;
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if (good_bytes < 0 || good_bytes >= this_count)
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good_bytes = 0;
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/*
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* The SCSI specification allows for the value
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* returned by READ CAPACITY to be up to 75 2K
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* sectors past the last readable block.
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* Therefore, if we hit a medium error within the
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* last 75 2K sectors, we decrease the saved size
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* value.
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*/
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if (error_sector < get_capacity(cd->disk) &&
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cd->capacity - error_sector < 4 * 75)
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set_capacity(cd->disk, error_sector);
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break;
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case RECOVERED_ERROR:
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good_bytes = this_count;
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break;
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default:
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break;
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}
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}
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return good_bytes;
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}
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static int sr_prep_fn(struct request_queue *q, struct request *rq)
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{
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int block = 0, this_count, s_size;
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struct scsi_cd *cd;
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struct scsi_cmnd *SCpnt;
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struct scsi_device *sdp = q->queuedata;
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int ret;
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if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
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ret = scsi_setup_blk_pc_cmnd(sdp, rq);
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goto out;
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} else if (rq->cmd_type != REQ_TYPE_FS) {
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ret = BLKPREP_KILL;
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goto out;
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}
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ret = scsi_setup_fs_cmnd(sdp, rq);
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if (ret != BLKPREP_OK)
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goto out;
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SCpnt = rq->special;
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cd = scsi_cd(rq->rq_disk);
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/* from here on until we're complete, any goto out
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* is used for a killable error condition */
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ret = BLKPREP_KILL;
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SCSI_LOG_HLQUEUE(1, printk("Doing sr request, dev = %s, block = %d\n",
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cd->disk->disk_name, block));
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if (!cd->device || !scsi_device_online(cd->device)) {
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SCSI_LOG_HLQUEUE(2, printk("Finishing %u sectors\n",
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blk_rq_sectors(rq)));
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SCSI_LOG_HLQUEUE(2, printk("Retry with 0x%p\n", SCpnt));
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goto out;
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}
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if (cd->device->changed) {
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/*
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* quietly refuse to do anything to a changed disc until the
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* changed bit has been reset
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*/
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goto out;
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}
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/*
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* we do lazy blocksize switching (when reading XA sectors,
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* see CDROMREADMODE2 ioctl)
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*/
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s_size = cd->device->sector_size;
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if (s_size > 2048) {
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if (!in_interrupt())
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sr_set_blocklength(cd, 2048);
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else
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printk("sr: can't switch blocksize: in interrupt\n");
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}
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if (s_size != 512 && s_size != 1024 && s_size != 2048) {
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scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size);
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goto out;
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}
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if (rq_data_dir(rq) == WRITE) {
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if (!cd->device->writeable)
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goto out;
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SCpnt->cmnd[0] = WRITE_10;
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SCpnt->sc_data_direction = DMA_TO_DEVICE;
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cd->cdi.media_written = 1;
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} else if (rq_data_dir(rq) == READ) {
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SCpnt->cmnd[0] = READ_10;
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SCpnt->sc_data_direction = DMA_FROM_DEVICE;
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} else {
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blk_dump_rq_flags(rq, "Unknown sr command");
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goto out;
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}
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{
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struct scatterlist *sg;
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int i, size = 0, sg_count = scsi_sg_count(SCpnt);
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scsi_for_each_sg(SCpnt, sg, sg_count, i)
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size += sg->length;
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if (size != scsi_bufflen(SCpnt)) {
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scmd_printk(KERN_ERR, SCpnt,
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"mismatch count %d, bytes %d\n",
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size, scsi_bufflen(SCpnt));
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if (scsi_bufflen(SCpnt) > size)
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SCpnt->sdb.length = size;
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}
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}
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/*
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* request doesn't start on hw block boundary, add scatter pads
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*/
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if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) ||
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(scsi_bufflen(SCpnt) % s_size)) {
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scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n");
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goto out;
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}
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this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9);
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SCSI_LOG_HLQUEUE(2, printk("%s : %s %d/%u 512 byte blocks.\n",
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cd->cdi.name,
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(rq_data_dir(rq) == WRITE) ?
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"writing" : "reading",
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this_count, blk_rq_sectors(rq)));
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SCpnt->cmnd[1] = 0;
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block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9);
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if (this_count > 0xffff) {
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this_count = 0xffff;
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SCpnt->sdb.length = this_count * s_size;
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}
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SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
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SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
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SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
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SCpnt->cmnd[5] = (unsigned char) block & 0xff;
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SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
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SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
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SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
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/*
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* We shouldn't disconnect in the middle of a sector, so with a dumb
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* host adapter, it's safe to assume that we can at least transfer
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* this many bytes between each connect / disconnect.
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*/
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SCpnt->transfersize = cd->device->sector_size;
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SCpnt->underflow = this_count << 9;
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SCpnt->allowed = MAX_RETRIES;
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/*
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* This indicates that the command is ready from our end to be
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* queued.
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*/
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ret = BLKPREP_OK;
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out:
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return scsi_prep_return(q, rq, ret);
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}
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static int sr_block_open(struct block_device *bdev, fmode_t mode)
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{
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struct scsi_cd *cd = scsi_cd_get(bdev->bd_disk);
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int ret = -ENXIO;
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if (cd) {
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ret = cdrom_open(&cd->cdi, bdev, mode);
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if (ret)
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scsi_cd_put(cd);
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}
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return ret;
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}
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static int sr_block_release(struct gendisk *disk, fmode_t mode)
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{
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struct scsi_cd *cd = scsi_cd(disk);
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cdrom_release(&cd->cdi, mode);
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scsi_cd_put(cd);
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return 0;
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}
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static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
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unsigned long arg)
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{
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struct scsi_cd *cd = scsi_cd(bdev->bd_disk);
|
|
struct scsi_device *sdev = cd->device;
|
|
void __user *argp = (void __user *)arg;
|
|
int ret;
|
|
|
|
/*
|
|
* Send SCSI addressing ioctls directly to mid level, send other
|
|
* ioctls to cdrom/block level.
|
|
*/
|
|
switch (cmd) {
|
|
case SCSI_IOCTL_GET_IDLUN:
|
|
case SCSI_IOCTL_GET_BUS_NUMBER:
|
|
return scsi_ioctl(sdev, cmd, argp);
|
|
}
|
|
|
|
ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg);
|
|
if (ret != -ENOSYS)
|
|
return ret;
|
|
|
|
/*
|
|
* ENODEV means that we didn't recognise the ioctl, or that we
|
|
* cannot execute it in the current device state. In either
|
|
* case fall through to scsi_ioctl, which will return ENDOEV again
|
|
* if it doesn't recognise the ioctl
|
|
*/
|
|
ret = scsi_nonblockable_ioctl(sdev, cmd, argp,
|
|
(mode & FMODE_NDELAY) != 0);
|
|
if (ret != -ENODEV)
|
|
return ret;
|
|
return scsi_ioctl(sdev, cmd, argp);
|
|
}
|
|
|
|
static int sr_block_media_changed(struct gendisk *disk)
|
|
{
|
|
struct scsi_cd *cd = scsi_cd(disk);
|
|
return cdrom_media_changed(&cd->cdi);
|
|
}
|
|
|
|
static const struct block_device_operations sr_bdops =
|
|
{
|
|
.owner = THIS_MODULE,
|
|
.open = sr_block_open,
|
|
.release = sr_block_release,
|
|
.locked_ioctl = sr_block_ioctl,
|
|
.media_changed = sr_block_media_changed,
|
|
/*
|
|
* No compat_ioctl for now because sr_block_ioctl never
|
|
* seems to pass arbitary ioctls down to host drivers.
|
|
*/
|
|
};
|
|
|
|
static int sr_open(struct cdrom_device_info *cdi, int purpose)
|
|
{
|
|
struct scsi_cd *cd = cdi->handle;
|
|
struct scsi_device *sdev = cd->device;
|
|
int retval;
|
|
|
|
/*
|
|
* If the device is in error recovery, wait until it is done.
|
|
* If the device is offline, then disallow any access to it.
|
|
*/
|
|
retval = -ENXIO;
|
|
if (!scsi_block_when_processing_errors(sdev))
|
|
goto error_out;
|
|
|
|
return 0;
|
|
|
|
error_out:
|
|
return retval;
|
|
}
|
|
|
|
static void sr_release(struct cdrom_device_info *cdi)
|
|
{
|
|
struct scsi_cd *cd = cdi->handle;
|
|
|
|
if (cd->device->sector_size > 2048)
|
|
sr_set_blocklength(cd, 2048);
|
|
|
|
}
|
|
|
|
static int sr_probe(struct device *dev)
|
|
{
|
|
struct scsi_device *sdev = to_scsi_device(dev);
|
|
struct gendisk *disk;
|
|
struct scsi_cd *cd;
|
|
int minor, error;
|
|
|
|
error = -ENODEV;
|
|
if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM)
|
|
goto fail;
|
|
|
|
error = -ENOMEM;
|
|
cd = kzalloc(sizeof(*cd), GFP_KERNEL);
|
|
if (!cd)
|
|
goto fail;
|
|
|
|
kref_init(&cd->kref);
|
|
|
|
disk = alloc_disk(1);
|
|
if (!disk)
|
|
goto fail_free;
|
|
|
|
spin_lock(&sr_index_lock);
|
|
minor = find_first_zero_bit(sr_index_bits, SR_DISKS);
|
|
if (minor == SR_DISKS) {
|
|
spin_unlock(&sr_index_lock);
|
|
error = -EBUSY;
|
|
goto fail_put;
|
|
}
|
|
__set_bit(minor, sr_index_bits);
|
|
spin_unlock(&sr_index_lock);
|
|
|
|
disk->major = SCSI_CDROM_MAJOR;
|
|
disk->first_minor = minor;
|
|
sprintf(disk->disk_name, "sr%d", minor);
|
|
disk->fops = &sr_bdops;
|
|
disk->flags = GENHD_FL_CD;
|
|
|
|
blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT);
|
|
|
|
cd->device = sdev;
|
|
cd->disk = disk;
|
|
cd->driver = &sr_template;
|
|
cd->disk = disk;
|
|
cd->capacity = 0x1fffff;
|
|
cd->device->changed = 1; /* force recheck CD type */
|
|
cd->previous_state = 1;
|
|
cd->use = 1;
|
|
cd->readcd_known = 0;
|
|
cd->readcd_cdda = 0;
|
|
|
|
cd->cdi.ops = &sr_dops;
|
|
cd->cdi.handle = cd;
|
|
cd->cdi.mask = 0;
|
|
cd->cdi.capacity = 1;
|
|
sprintf(cd->cdi.name, "sr%d", minor);
|
|
|
|
sdev->sector_size = 2048; /* A guess, just in case */
|
|
|
|
/* FIXME: need to handle a get_capabilities failure properly ?? */
|
|
get_capabilities(cd);
|
|
blk_queue_prep_rq(sdev->request_queue, sr_prep_fn);
|
|
sr_vendor_init(cd);
|
|
|
|
disk->driverfs_dev = &sdev->sdev_gendev;
|
|
set_capacity(disk, cd->capacity);
|
|
disk->private_data = &cd->driver;
|
|
disk->queue = sdev->request_queue;
|
|
cd->cdi.disk = disk;
|
|
|
|
if (register_cdrom(&cd->cdi))
|
|
goto fail_put;
|
|
|
|
dev_set_drvdata(dev, cd);
|
|
disk->flags |= GENHD_FL_REMOVABLE;
|
|
add_disk(disk);
|
|
|
|
sdev_printk(KERN_DEBUG, sdev,
|
|
"Attached scsi CD-ROM %s\n", cd->cdi.name);
|
|
return 0;
|
|
|
|
fail_put:
|
|
put_disk(disk);
|
|
fail_free:
|
|
kfree(cd);
|
|
fail:
|
|
return error;
|
|
}
|
|
|
|
|
|
static void get_sectorsize(struct scsi_cd *cd)
|
|
{
|
|
unsigned char cmd[10];
|
|
unsigned char buffer[8];
|
|
int the_result, retries = 3;
|
|
int sector_size;
|
|
struct request_queue *queue;
|
|
|
|
do {
|
|
cmd[0] = READ_CAPACITY;
|
|
memset((void *) &cmd[1], 0, 9);
|
|
memset(buffer, 0, sizeof(buffer));
|
|
|
|
/* Do the command and wait.. */
|
|
the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE,
|
|
buffer, sizeof(buffer), NULL,
|
|
SR_TIMEOUT, MAX_RETRIES, NULL);
|
|
|
|
retries--;
|
|
|
|
} while (the_result && retries);
|
|
|
|
|
|
if (the_result) {
|
|
cd->capacity = 0x1fffff;
|
|
sector_size = 2048; /* A guess, just in case */
|
|
} else {
|
|
#if 0
|
|
if (cdrom_get_last_written(&cd->cdi,
|
|
&cd->capacity))
|
|
#endif
|
|
cd->capacity = 1 + ((buffer[0] << 24) |
|
|
(buffer[1] << 16) |
|
|
(buffer[2] << 8) |
|
|
buffer[3]);
|
|
sector_size = (buffer[4] << 24) |
|
|
(buffer[5] << 16) | (buffer[6] << 8) | buffer[7];
|
|
switch (sector_size) {
|
|
/*
|
|
* HP 4020i CD-Recorder reports 2340 byte sectors
|
|
* Philips CD-Writers report 2352 byte sectors
|
|
*
|
|
* Use 2k sectors for them..
|
|
*/
|
|
case 0:
|
|
case 2340:
|
|
case 2352:
|
|
sector_size = 2048;
|
|
/* fall through */
|
|
case 2048:
|
|
cd->capacity *= 4;
|
|
/* fall through */
|
|
case 512:
|
|
break;
|
|
default:
|
|
printk("%s: unsupported sector size %d.\n",
|
|
cd->cdi.name, sector_size);
|
|
cd->capacity = 0;
|
|
}
|
|
|
|
cd->device->sector_size = sector_size;
|
|
|
|
/*
|
|
* Add this so that we have the ability to correctly gauge
|
|
* what the device is capable of.
|
|
*/
|
|
set_capacity(cd->disk, cd->capacity);
|
|
}
|
|
|
|
queue = cd->device->request_queue;
|
|
blk_queue_logical_block_size(queue, sector_size);
|
|
|
|
return;
|
|
}
|
|
|
|
static void get_capabilities(struct scsi_cd *cd)
|
|
{
|
|
unsigned char *buffer;
|
|
struct scsi_mode_data data;
|
|
struct scsi_sense_hdr sshdr;
|
|
int rc, n;
|
|
|
|
static const char *loadmech[] =
|
|
{
|
|
"caddy",
|
|
"tray",
|
|
"pop-up",
|
|
"",
|
|
"changer",
|
|
"cartridge changer",
|
|
"",
|
|
""
|
|
};
|
|
|
|
|
|
/* allocate transfer buffer */
|
|
buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
|
|
if (!buffer) {
|
|
printk(KERN_ERR "sr: out of memory.\n");
|
|
return;
|
|
}
|
|
|
|
/* eat unit attentions */
|
|
sr_test_unit_ready(cd->device, &sshdr);
|
|
|
|
/* ask for mode page 0x2a */
|
|
rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, 128,
|
|
SR_TIMEOUT, 3, &data, NULL);
|
|
|
|
if (!scsi_status_is_good(rc)) {
|
|
/* failed, drive doesn't have capabilities mode page */
|
|
cd->cdi.speed = 1;
|
|
cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R |
|
|
CDC_DVD | CDC_DVD_RAM |
|
|
CDC_SELECT_DISC | CDC_SELECT_SPEED |
|
|
CDC_MRW | CDC_MRW_W | CDC_RAM);
|
|
kfree(buffer);
|
|
printk("%s: scsi-1 drive\n", cd->cdi.name);
|
|
return;
|
|
}
|
|
|
|
n = data.header_length + data.block_descriptor_length;
|
|
cd->cdi.speed = ((buffer[n + 8] << 8) + buffer[n + 9]) / 176;
|
|
cd->readcd_known = 1;
|
|
cd->readcd_cdda = buffer[n + 5] & 0x01;
|
|
/* print some capability bits */
|
|
printk("%s: scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", cd->cdi.name,
|
|
((buffer[n + 14] << 8) + buffer[n + 15]) / 176,
|
|
cd->cdi.speed,
|
|
buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */
|
|
buffer[n + 3] & 0x20 ? "dvd-ram " : "",
|
|
buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */
|
|
buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */
|
|
buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */
|
|
loadmech[buffer[n + 6] >> 5]);
|
|
if ((buffer[n + 6] >> 5) == 0)
|
|
/* caddy drives can't close tray... */
|
|
cd->cdi.mask |= CDC_CLOSE_TRAY;
|
|
if ((buffer[n + 2] & 0x8) == 0)
|
|
/* not a DVD drive */
|
|
cd->cdi.mask |= CDC_DVD;
|
|
if ((buffer[n + 3] & 0x20) == 0)
|
|
/* can't write DVD-RAM media */
|
|
cd->cdi.mask |= CDC_DVD_RAM;
|
|
if ((buffer[n + 3] & 0x10) == 0)
|
|
/* can't write DVD-R media */
|
|
cd->cdi.mask |= CDC_DVD_R;
|
|
if ((buffer[n + 3] & 0x2) == 0)
|
|
/* can't write CD-RW media */
|
|
cd->cdi.mask |= CDC_CD_RW;
|
|
if ((buffer[n + 3] & 0x1) == 0)
|
|
/* can't write CD-R media */
|
|
cd->cdi.mask |= CDC_CD_R;
|
|
if ((buffer[n + 6] & 0x8) == 0)
|
|
/* can't eject */
|
|
cd->cdi.mask |= CDC_OPEN_TRAY;
|
|
|
|
if ((buffer[n + 6] >> 5) == mechtype_individual_changer ||
|
|
(buffer[n + 6] >> 5) == mechtype_cartridge_changer)
|
|
cd->cdi.capacity =
|
|
cdrom_number_of_slots(&cd->cdi);
|
|
if (cd->cdi.capacity <= 1)
|
|
/* not a changer */
|
|
cd->cdi.mask |= CDC_SELECT_DISC;
|
|
/*else I don't think it can close its tray
|
|
cd->cdi.mask |= CDC_CLOSE_TRAY; */
|
|
|
|
/*
|
|
* if DVD-RAM, MRW-W or CD-RW, we are randomly writable
|
|
*/
|
|
if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) !=
|
|
(CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) {
|
|
cd->device->writeable = 1;
|
|
}
|
|
|
|
kfree(buffer);
|
|
}
|
|
|
|
/*
|
|
* sr_packet() is the entry point for the generic commands generated
|
|
* by the Uniform CD-ROM layer.
|
|
*/
|
|
static int sr_packet(struct cdrom_device_info *cdi,
|
|
struct packet_command *cgc)
|
|
{
|
|
if (cgc->timeout <= 0)
|
|
cgc->timeout = IOCTL_TIMEOUT;
|
|
|
|
sr_do_ioctl(cdi->handle, cgc);
|
|
|
|
return cgc->stat;
|
|
}
|
|
|
|
/**
|
|
* sr_kref_release - Called to free the scsi_cd structure
|
|
* @kref: pointer to embedded kref
|
|
*
|
|
* sr_ref_mutex must be held entering this routine. Because it is
|
|
* called on last put, you should always use the scsi_cd_get()
|
|
* scsi_cd_put() helpers which manipulate the semaphore directly
|
|
* and never do a direct kref_put().
|
|
**/
|
|
static void sr_kref_release(struct kref *kref)
|
|
{
|
|
struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref);
|
|
struct gendisk *disk = cd->disk;
|
|
|
|
spin_lock(&sr_index_lock);
|
|
clear_bit(MINOR(disk_devt(disk)), sr_index_bits);
|
|
spin_unlock(&sr_index_lock);
|
|
|
|
unregister_cdrom(&cd->cdi);
|
|
|
|
disk->private_data = NULL;
|
|
|
|
put_disk(disk);
|
|
|
|
kfree(cd);
|
|
}
|
|
|
|
static int sr_remove(struct device *dev)
|
|
{
|
|
struct scsi_cd *cd = dev_get_drvdata(dev);
|
|
|
|
blk_queue_prep_rq(cd->device->request_queue, scsi_prep_fn);
|
|
del_gendisk(cd->disk);
|
|
|
|
mutex_lock(&sr_ref_mutex);
|
|
kref_put(&cd->kref, sr_kref_release);
|
|
mutex_unlock(&sr_ref_mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __init init_sr(void)
|
|
{
|
|
int rc;
|
|
|
|
rc = register_blkdev(SCSI_CDROM_MAJOR, "sr");
|
|
if (rc)
|
|
return rc;
|
|
rc = scsi_register_driver(&sr_template.gendrv);
|
|
if (rc)
|
|
unregister_blkdev(SCSI_CDROM_MAJOR, "sr");
|
|
|
|
return rc;
|
|
}
|
|
|
|
static void __exit exit_sr(void)
|
|
{
|
|
scsi_unregister_driver(&sr_template.gendrv);
|
|
unregister_blkdev(SCSI_CDROM_MAJOR, "sr");
|
|
}
|
|
|
|
module_init(init_sr);
|
|
module_exit(exit_sr);
|
|
MODULE_LICENSE("GPL");
|