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gerrit-public.fairphone.software / kernel / msm / da167876bd0f71f1c646e5dd98997544d8d90e8e / . / drivers / ide / ide-cd.c
blob: 7dc1a17a4dd806d6feaeaa8ccca3507a137ddb16 [file] [log] [blame]
/*
* ATAPI CD-ROM driver.
*
* Copyright (C) 1994-1996 Scott Snyder <snyder@fnald0.fnal.gov>
* Copyright (C) 1996-1998 Erik Andersen <andersee@debian.org>
* Copyright (C) 1998-2000 Jens Axboe <axboe@suse.de>
* Copyright (C) 2005, 2007 Bartlomiej Zolnierkiewicz
*
* May be copied or modified under the terms of the GNU General Public
* License. See linux/COPYING for more information.
*
* See Documentation/cdrom/ide-cd for usage information.
*
* Suggestions are welcome. Patches that work are more welcome though. ;-)
* For those wishing to work on this driver, please be sure you download
* and comply with the latest Mt. Fuji (SFF8090 version 4) and ATAPI
* (SFF-8020i rev 2.6) standards. These documents can be obtained by
* anonymous ftp from:
* ftp://fission.dt.wdc.com/pub/standards/SFF_atapi/spec/SFF8020-r2.6/PS/8020r26.ps
* ftp://ftp.avc-pioneer.com/Mtfuji4/Spec/Fuji4r10.pdf
*
* For historical changelog please see:
* Documentation/ide/ChangeLog.ide-cd.1994-2004
*/
#define DRV_NAME "ide-cd"
#define PFX DRV_NAME ": "
#define IDECD_VERSION "5.00"
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/errno.h>
#include <linux/cdrom.h>
#include <linux/ide.h>
#include <linux/completion.h>
#include <linux/mutex.h>
#include <linux/bcd.h>
/* For SCSI -> ATAPI command conversion */
#include <scsi/scsi.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <asm/byteorder.h>
#include <linux/uaccess.h>
#include <asm/unaligned.h>
#include "ide-cd.h"
#define IDECD_DEBUG_LOG 1
#if IDECD_DEBUG_LOG
#define ide_debug_log(lvl, fmt, args...) __ide_debug_log(lvl, fmt, args)
#else
#define ide_debug_log(lvl, fmt, args...) do {} while (0)
#endif
static DEFINE_MUTEX(idecd_ref_mutex);
static void ide_cd_release(struct kref *);
static struct cdrom_info *ide_cd_get(struct gendisk *disk)
{
struct cdrom_info *cd = NULL;
mutex_lock(&idecd_ref_mutex);
cd = ide_drv_g(disk, cdrom_info);
if (cd) {
if (ide_device_get(cd->drive))
cd = NULL;
else
kref_get(&cd->kref);
}
mutex_unlock(&idecd_ref_mutex);
return cd;
}
static void ide_cd_put(struct cdrom_info *cd)
{
ide_drive_t *drive = cd->drive;
mutex_lock(&idecd_ref_mutex);
kref_put(&cd->kref, ide_cd_release);
ide_device_put(drive);
mutex_unlock(&idecd_ref_mutex);
}
/*
* Generic packet command support and error handling routines.
*/
/* Mark that we've seen a media change and invalidate our internal buffers. */
static void cdrom_saw_media_change(ide_drive_t *drive)
{
drive->dev_flags |= IDE_DFLAG_MEDIA_CHANGED;
drive->atapi_flags &= ~IDE_AFLAG_TOC_VALID;
}
static int cdrom_log_sense(ide_drive_t *drive, struct request *rq,
struct request_sense *sense)
{
int log = 0;
ide_debug_log(IDE_DBG_SENSE, "Call %s, sense_key: 0x%x\n", __func__,
sense->sense_key);
if (!sense || !rq || (rq->cmd_flags & REQ_QUIET))
return 0;
switch (sense->sense_key) {
case NO_SENSE:
case RECOVERED_ERROR:
break;
case NOT_READY:
/*
* don't care about tray state messages for e.g. capacity
* commands or in-progress or becoming ready
*/
if (sense->asc == 0x3a || sense->asc == 0x04)
break;
log = 1;
break;
case ILLEGAL_REQUEST:
/*
* don't log START_STOP unit with LoEj set, since we cannot
* reliably check if drive can auto-close
*/
if (rq->cmd[0] == GPCMD_START_STOP_UNIT && sense->asc == 0x24)
break;
log = 1;
break;
case UNIT_ATTENTION:
/*
* Make good and sure we've seen this potential media change.
* Some drives (i.e. Creative) fail to present the correct sense
* key in the error register.
*/
cdrom_saw_media_change(drive);
break;
default:
log = 1;
break;
}
return log;
}
static void cdrom_analyze_sense_data(ide_drive_t *drive,
struct request *failed_command,
struct request_sense *sense)
{
unsigned long sector;
unsigned long bio_sectors;
struct cdrom_info *info = drive->driver_data;
ide_debug_log(IDE_DBG_SENSE, "Call %s, error_code: 0x%x, "
"sense_key: 0x%x\n", __func__, sense->error_code,
sense->sense_key);
if (failed_command)
ide_debug_log(IDE_DBG_SENSE, "%s: failed cmd: 0x%x\n",
__func__, failed_command->cmd[0]);
if (!cdrom_log_sense(drive, failed_command, sense))
return;
/*
* If a read toc is executed for a CD-R or CD-RW medium where the first
* toc has not been recorded yet, it will fail with 05/24/00 (which is a
* confusing error)
*/
if (failed_command && failed_command->cmd[0] == GPCMD_READ_TOC_PMA_ATIP)
if (sense->sense_key == 0x05 && sense->asc == 0x24)
return;
/* current error */
if (sense->error_code == 0x70) {
switch (sense->sense_key) {
case MEDIUM_ERROR:
case VOLUME_OVERFLOW:
case ILLEGAL_REQUEST:
if (!sense->valid)
break;
if (failed_command == NULL ||
!blk_fs_request(failed_command))
break;
sector = (sense->information[0] << 24) |
(sense->information[1] << 16) |
(sense->information[2] << 8) |
(sense->information[3]);
if (drive->queue->hardsect_size == 2048)
/* device sector size is 2K */
sector <<= 2;
bio_sectors = max(bio_sectors(failed_command->bio), 4U);
sector &= ~(bio_sectors - 1);
if (sector < get_capacity(info->disk) &&
drive->probed_capacity - sector < 4 * 75)
set_capacity(info->disk, sector);
}
}
ide_cd_log_error(drive->name, failed_command, sense);
}
static void cdrom_queue_request_sense(ide_drive_t *drive, void *sense,
struct request *failed_command)
{
struct cdrom_info *info = drive->driver_data;
struct request *rq = &info->request_sense_request;
ide_debug_log(IDE_DBG_SENSE, "Call %s\n", __func__);
if (sense == NULL)
sense = &info->sense_data;
/* stuff the sense request in front of our current request */
blk_rq_init(NULL, rq);
rq->cmd_type = REQ_TYPE_ATA_PC;
rq->rq_disk = info->disk;
rq->data = sense;
rq->cmd[0] = GPCMD_REQUEST_SENSE;
rq->cmd[4] = 18;
rq->data_len = 18;
rq->cmd_type = REQ_TYPE_SENSE;
rq->cmd_flags |= REQ_PREEMPT;
/* NOTE! Save the failed command in "rq->buffer" */
rq->buffer = (void *) failed_command;
if (failed_command)
ide_debug_log(IDE_DBG_SENSE, "failed_cmd: 0x%x\n",
failed_command->cmd[0]);
ide_do_drive_cmd(drive, rq);
}
static void cdrom_end_request(ide_drive_t *drive, int uptodate)
{
struct request *rq = HWGROUP(drive)->rq;
int nsectors = rq->hard_cur_sectors;
ide_debug_log(IDE_DBG_FUNC, "Call %s, cmd: 0x%x, uptodate: 0x%x, "
"nsectors: %d\n", __func__, rq->cmd[0], uptodate,
nsectors);
if (blk_sense_request(rq) && uptodate) {
/*
* For REQ_TYPE_SENSE, "rq->buffer" points to the original
* failed request
*/
struct request *failed = (struct request *) rq->buffer;
struct cdrom_info *info = drive->driver_data;
void *sense = &info->sense_data;
unsigned long flags;
if (failed) {
if (failed->sense) {
sense = failed->sense;
failed->sense_len = rq->sense_len;
}
cdrom_analyze_sense_data(drive, failed, sense);
/*
* now end the failed request
*/
if (blk_fs_request(failed)) {
if (ide_end_dequeued_request(drive, failed, 0,
failed->hard_nr_sectors))
BUG();
} else {
spin_lock_irqsave(&ide_lock, flags);
if (__blk_end_request(failed, -EIO,
failed->data_len))
BUG();
spin_unlock_irqrestore(&ide_lock, flags);
}
} else
cdrom_analyze_sense_data(drive, NULL, sense);
}
if (!rq->current_nr_sectors && blk_fs_request(rq))
uptodate = 1;
/* make sure it's fully ended */
if (blk_pc_request(rq))
nsectors = (rq->data_len + 511) >> 9;
if (!nsectors)
nsectors = 1;
ide_debug_log(IDE_DBG_FUNC, "Exit %s, uptodate: 0x%x, nsectors: %d\n",
__func__, uptodate, nsectors);
ide_end_request(drive, uptodate, nsectors);
}
static void ide_dump_status_no_sense(ide_drive_t *drive, const char *msg, u8 st)
{
if (st & 0x80)
return;
ide_dump_status(drive, msg, st);
}
/*
* Returns:
* 0: if the request should be continued.
* 1: if the request was ended.
*/
static int cdrom_decode_status(ide_drive_t *drive, int good_stat, int *stat_ret)
{
ide_hwif_t *hwif = drive->hwif;
struct request *rq = hwif->hwgroup->rq;
int stat, err, sense_key;
/* check for errors */
stat = hwif->tp_ops->read_status(hwif);
if (stat_ret)
*stat_ret = stat;
if (OK_STAT(stat, good_stat, BAD_R_STAT))
return 0;
/* get the IDE error register */
err = ide_read_error(drive);
sense_key = err >> 4;
if (rq == NULL) {
printk(KERN_ERR PFX "%s: missing rq in %s\n",
drive->name, __func__);
return 1;
}
ide_debug_log(IDE_DBG_RQ, "%s: stat: 0x%x, good_stat: 0x%x, "
"rq->cmd_type: 0x%x, err: 0x%x\n", __func__, stat,
good_stat, rq->cmd_type, err);
if (blk_sense_request(rq)) {
/*
* We got an error trying to get sense info from the drive
* (probably while trying to recover from a former error).
* Just give up.
*/
rq->cmd_flags |= REQ_FAILED;
cdrom_end_request(drive, 0);
ide_error(drive, "request sense failure", stat);
return 1;
} else if (blk_pc_request(rq) || rq->cmd_type == REQ_TYPE_ATA_PC) {
/* All other functions, except for READ. */
/*
* if we have an error, pass back CHECK_CONDITION as the
* scsi status byte
*/
if (blk_pc_request(rq) && !rq->errors)
rq->errors = SAM_STAT_CHECK_CONDITION;
/* check for tray open */
if (sense_key == NOT_READY) {
cdrom_saw_media_change(drive);
} else if (sense_key == UNIT_ATTENTION) {
/* check for media change */
cdrom_saw_media_change(drive);
return 0;
} else if (sense_key == ILLEGAL_REQUEST &&
rq->cmd[0] == GPCMD_START_STOP_UNIT) {
/*
* Don't print error message for this condition--
* SFF8090i indicates that 5/24/00 is the correct
* response to a request to close the tray if the
* drive doesn't have that capability.
* cdrom_log_sense() knows this!
*/
} else if (!(rq->cmd_flags & REQ_QUIET)) {
/* otherwise, print an error */
ide_dump_status(drive, "packet command error", stat);
}
rq->cmd_flags |= REQ_FAILED;
/*
* instead of playing games with moving completions around,
* remove failed request completely and end it when the
* request sense has completed
*/
goto end_request;
} else if (blk_fs_request(rq)) {
int do_end_request = 0;
/* handle errors from READ and WRITE requests */
if (blk_noretry_request(rq))
do_end_request = 1;
if (sense_key == NOT_READY) {
/* tray open */
if (rq_data_dir(rq) == READ) {
cdrom_saw_media_change(drive);
/* fail the request */
printk(KERN_ERR PFX "%s: tray open\n",
drive->name);
do_end_request = 1;
} else {
struct cdrom_info *info = drive->driver_data;
/*
* Allow the drive 5 seconds to recover, some
* devices will return this error while flushing
* data from cache.
*/
if (!rq->errors)
info->write_timeout = jiffies +
ATAPI_WAIT_WRITE_BUSY;
rq->errors = 1;
if (time_after(jiffies, info->write_timeout))
do_end_request = 1;
else {
unsigned long flags;
/*
* take a breather relying on the unplug
* timer to kick us again
*/
spin_lock_irqsave(&ide_lock, flags);
blk_plug_device(drive->queue);
spin_unlock_irqrestore(&ide_lock,
flags);
return 1;
}
}
} else if (sense_key == UNIT_ATTENTION) {
/* media change */
cdrom_saw_media_change(drive);
/*
* Arrange to retry the request but be sure to give up
* if we've retried too many times.
*/
if (++rq->errors > ERROR_MAX)
do_end_request = 1;
} else if (sense_key == ILLEGAL_REQUEST ||
sense_key == DATA_PROTECT) {
/*
* No point in retrying after an illegal request or data
* protect error.
*/
ide_dump_status_no_sense(drive, "command error", stat);
do_end_request = 1;
} else if (sense_key == MEDIUM_ERROR) {
/*
* No point in re-trying a zillion times on a bad
* sector. If we got here the error is not correctable.
*/
ide_dump_status_no_sense(drive,
"media error (bad sector)",
stat);
do_end_request = 1;
} else if (sense_key == BLANK_CHECK) {
/* disk appears blank ?? */
ide_dump_status_no_sense(drive, "media error (blank)",
stat);
do_end_request = 1;
} else if ((err & ~ATA_ABORTED) != 0) {
/* go to the default handler for other errors */
ide_error(drive, "cdrom_decode_status", stat);
return 1;
} else if ((++rq->errors > ERROR_MAX)) {
/* we've racked up too many retries, abort */
do_end_request = 1;
}
/*
* End a request through request sense analysis when we have
* sense data. We need this in order to perform end of media
* processing.
*/
if (do_end_request)
goto end_request;
/*
* If we got a CHECK_CONDITION status, queue
* a request sense command.
*/
if (stat & ATA_ERR)
cdrom_queue_request_sense(drive, NULL, NULL);
} else {
blk_dump_rq_flags(rq, PFX "bad rq");
cdrom_end_request(drive, 0);
}
/* retry, or handle the next request */
return 1;
end_request:
if (stat & ATA_ERR) {
unsigned long flags;
spin_lock_irqsave(&ide_lock, flags);
blkdev_dequeue_request(rq);
HWGROUP(drive)->rq = NULL;
spin_unlock_irqrestore(&ide_lock, flags);
cdrom_queue_request_sense(drive, rq->sense, rq);
} else
cdrom_end_request(drive, 0);
return 1;
}
static int cdrom_timer_expiry(ide_drive_t *drive)
{
struct request *rq = HWGROUP(drive)->rq;
unsigned long wait = 0;
ide_debug_log(IDE_DBG_RQ, "Call %s: rq->cmd[0]: 0x%x\n", __func__,
rq->cmd[0]);
/*
* Some commands are *slow* and normally take a long time to complete.
* Usually we can use the ATAPI "disconnect" to bypass this, but not all
* commands/drives support that. Let ide_timer_expiry keep polling us
* for these.
*/
switch (rq->cmd[0]) {
case GPCMD_BLANK:
case GPCMD_FORMAT_UNIT:
case GPCMD_RESERVE_RZONE_TRACK:
case GPCMD_CLOSE_TRACK:
case GPCMD_FLUSH_CACHE:
wait = ATAPI_WAIT_PC;
break;
default:
if (!(rq->cmd_flags & REQ_QUIET))
printk(KERN_INFO PFX "cmd 0x%x timed out\n",
rq->cmd[0]);
wait = 0;
break;
}
return wait;
}
/*
* Set up the device registers for transferring a packet command on DEV,
* expecting to later transfer XFERLEN bytes. HANDLER is the routine
* which actually transfers the command to the drive. If this is a
* drq_interrupt device, this routine will arrange for HANDLER to be
* called when the interrupt from the drive arrives. Otherwise, HANDLER
* will be called immediately after the drive is prepared for the transfer.
*/
static ide_startstop_t cdrom_start_packet_command(ide_drive_t *drive,
int xferlen,
ide_handler_t *handler)
{
ide_hwif_t *hwif = drive->hwif;
ide_debug_log(IDE_DBG_PC, "Call %s, xferlen: %d\n", __func__, xferlen);
/* FIXME: for Virtual DMA we must check harder */
if (drive->dma)
drive->dma = !hwif->dma_ops->dma_setup(drive);
/* set up the controller registers */
ide_pktcmd_tf_load(drive, IDE_TFLAG_OUT_NSECT | IDE_TFLAG_OUT_LBAL,
xferlen, drive->dma);
if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {
/* waiting for CDB interrupt, not DMA yet. */
if (drive->dma)
drive->waiting_for_dma = 0;
/* packet command */
ide_execute_command(drive, ATA_CMD_PACKET, handler,
ATAPI_WAIT_PC, cdrom_timer_expiry);
return ide_started;
} else {
ide_execute_pkt_cmd(drive);
return (*handler) (drive);
}
}
/*
* Send a packet command to DRIVE described by CMD_BUF and CMD_LEN. The device
* registers must have already been prepared by cdrom_start_packet_command.
* HANDLER is the interrupt handler to call when the command completes or
* there's data ready.
*/
#define ATAPI_MIN_CDB_BYTES 12
static ide_startstop_t cdrom_transfer_packet_command(ide_drive_t *drive,
struct request *rq,
ide_handler_t *handler)
{
ide_hwif_t *hwif = drive->hwif;
int cmd_len;
ide_startstop_t startstop;
ide_debug_log(IDE_DBG_PC, "Call %s\n", __func__);
if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {
/*
* Here we should have been called after receiving an interrupt
* from the device. DRQ should how be set.
*/
/* check for errors */
if (cdrom_decode_status(drive, ATA_DRQ, NULL))
return ide_stopped;
/* ok, next interrupt will be DMA interrupt */
if (drive->dma)
drive->waiting_for_dma = 1;
} else {
/* otherwise, we must wait for DRQ to get set */
if (ide_wait_stat(&startstop, drive, ATA_DRQ,
ATA_BUSY, WAIT_READY))
return startstop;
}
/* arm the interrupt handler */
ide_set_handler(drive, handler, rq->timeout, cdrom_timer_expiry);
/* ATAPI commands get padded out to 12 bytes minimum */
cmd_len = COMMAND_SIZE(rq->cmd[0]);
if (cmd_len < ATAPI_MIN_CDB_BYTES)
cmd_len = ATAPI_MIN_CDB_BYTES;
/* send the command to the device */
hwif->tp_ops->output_data(drive, NULL, rq->cmd, cmd_len);
/* start the DMA if need be */
if (drive->dma)
hwif->dma_ops->dma_start(drive);
return ide_started;
}
/*
* Check the contents of the interrupt reason register from the cdrom
* and attempt to recover if there are problems. Returns 0 if everything's
* ok; nonzero if the request has been terminated.
*/
static int ide_cd_check_ireason(ide_drive_t *drive, struct request *rq,
int len, int ireason, int rw)
{
ide_hwif_t *hwif = drive->hwif;
ide_debug_log(IDE_DBG_FUNC, "Call %s, ireason: 0x%x, rw: 0x%x\n",
__func__, ireason, rw);
/*
* ireason == 0: the drive wants to receive data from us
* ireason == 2: the drive is expecting to transfer data to us
*/
if (ireason == (!rw << 1))
return 0;
else if (ireason == (rw << 1)) {
/* whoops... */
printk(KERN_ERR PFX "%s: %s: wrong transfer direction!\n",
drive->name, __func__);
ide_pad_transfer(drive, rw, len);
} else if (rw == 0 && ireason == 1) {
/*
* Some drives (ASUS) seem to tell us that status info is
* available. Just get it and ignore.
*/
(void)hwif->tp_ops->read_status(hwif);
return 0;
} else {
/* drive wants a command packet, or invalid ireason... */
printk(KERN_ERR PFX "%s: %s: bad interrupt reason 0x%02x\n",
drive->name, __func__, ireason);
}
if (rq->cmd_type == REQ_TYPE_ATA_PC)
rq->cmd_flags |= REQ_FAILED;
cdrom_end_request(drive, 0);
return -1;
}
/*
* Assume that the drive will always provide data in multiples of at least
* SECTOR_SIZE, as it gets hairy to keep track of the transfers otherwise.
*/
static int ide_cd_check_transfer_size(ide_drive_t *drive, int len)
{
ide_debug_log(IDE_DBG_FUNC, "Call %s, len: %d\n", __func__, len);
if ((len % SECTOR_SIZE) == 0)
return 0;
printk(KERN_ERR PFX "%s: %s: Bad transfer size %d\n", drive->name,
__func__, len);
if (drive->atapi_flags & IDE_AFLAG_LIMIT_NFRAMES)
printk(KERN_ERR PFX "This drive is not supported by this "
"version of the driver\n");
else {
printk(KERN_ERR PFX "Trying to limit transfer sizes\n");
drive->atapi_flags |= IDE_AFLAG_LIMIT_NFRAMES;
}
return 1;
}
static ide_startstop_t cdrom_newpc_intr(ide_drive_t *);
static ide_startstop_t ide_cd_prepare_rw_request(ide_drive_t *drive,
struct request *rq)
{
ide_debug_log(IDE_DBG_RQ, "Call %s: rq->cmd_flags: 0x%x\n", __func__,
rq->cmd_flags);
if (rq_data_dir(rq) == READ) {
unsigned short sectors_per_frame =
queue_hardsect_size(drive->queue) >> SECTOR_BITS;
int nskip = rq->sector & (sectors_per_frame - 1);
/*
* If the requested sector doesn't start on a frame boundary,
* we must adjust the start of the transfer so that it does,
* and remember to skip the first few sectors.
*
* If the rq->current_nr_sectors field is larger than the size
* of the buffer, it will mean that we're to skip a number of
* sectors equal to the amount by which rq->current_nr_sectors
* is larger than the buffer size.
*/
if (nskip > 0) {
/* sanity check... */
if (rq->current_nr_sectors !=
bio_cur_sectors(rq->bio)) {
printk(KERN_ERR PFX "%s: %s: buffer botch (%u)\n",
drive->name, __func__,
rq->current_nr_sectors);
cdrom_end_request(drive, 0);
return ide_stopped;
}
rq->current_nr_sectors += nskip;
}
}
/* set up the command */
rq->timeout = ATAPI_WAIT_PC;
return ide_started;
}
/*
* Routine to send a read/write packet command to the drive. This is usually
* called directly from cdrom_start_{read,write}(). However, for drq_interrupt
* devices, it is called from an interrupt when the drive is ready to accept
* the command.
*/
static ide_startstop_t cdrom_start_rw_cont(ide_drive_t *drive)
{
struct request *rq = drive->hwif->hwgroup->rq;
/* send the command to the drive and return */
return cdrom_transfer_packet_command(drive, rq, cdrom_newpc_intr);
}
#define IDECD_SEEK_THRESHOLD (1000) /* 1000 blocks */
#define IDECD_SEEK_TIMER (5 * WAIT_MIN_SLEEP) /* 100 ms */
#define IDECD_SEEK_TIMEOUT (2 * WAIT_CMD) /* 20 sec */
static ide_startstop_t cdrom_seek_intr(ide_drive_t *drive)
{
struct cdrom_info *info = drive->driver_data;
int stat;
static int retry = 10;
ide_debug_log(IDE_DBG_FUNC, "Call %s\n", __func__);
if (cdrom_decode_status(drive, 0, &stat))
return ide_stopped;
drive->atapi_flags |= IDE_AFLAG_SEEKING;
if (retry && time_after(jiffies, info->start_seek + IDECD_SEEK_TIMER)) {
if (--retry == 0)
drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP;
}
return ide_stopped;
}
static void ide_cd_prepare_seek_request(ide_drive_t *drive, struct request *rq)
{
sector_t frame = rq->sector;
ide_debug_log(IDE_DBG_FUNC, "Call %s\n", __func__);
sector_div(frame, queue_hardsect_size(drive->queue) >> SECTOR_BITS);
memset(rq->cmd, 0, BLK_MAX_CDB);
rq->cmd[0] = GPCMD_SEEK;
put_unaligned(cpu_to_be32(frame), (unsigned int *) &rq->cmd[2]);
rq->timeout = ATAPI_WAIT_PC;
}
static ide_startstop_t cdrom_start_seek_continuation(ide_drive_t *drive)
{
struct request *rq = drive->hwif->hwgroup->rq;
return cdrom_transfer_packet_command(drive, rq, &cdrom_seek_intr);
}
/*
* Fix up a possibly partially-processed request so that we can start it over
* entirely, or even put it back on the request queue.
*/
static void ide_cd_restore_request(ide_drive_t *drive, struct request *rq)
{
ide_debug_log(IDE_DBG_FUNC, "Call %s\n", __func__);
if (rq->buffer != bio_data(rq->bio)) {
sector_t n =
(rq->buffer - (char *)bio_data(rq->bio)) / SECTOR_SIZE;
rq->buffer = bio_data(rq->bio);
rq->nr_sectors += n;
rq->sector -= n;
}
rq->current_nr_sectors = bio_cur_sectors(rq->bio);
rq->hard_cur_sectors = rq->current_nr_sectors;
rq->hard_nr_sectors = rq->nr_sectors;
rq->hard_sector = rq->sector;
rq->q->prep_rq_fn(rq->q, rq);
}
/*
* All other packet commands.
*/
static void ide_cd_request_sense_fixup(ide_drive_t *drive, struct request *rq)
{
ide_debug_log(IDE_DBG_FUNC, "Call %s\n", __func__);
/*
* Some of the trailing request sense fields are optional,
* and some drives don't send them. Sigh.
*/
if (rq->cmd[0] == GPCMD_REQUEST_SENSE &&
rq->data_len > 0 && rq->data_len <= 5)
while (rq->data_len > 0) {
*(u8 *)rq->data++ = 0;
--rq->data_len;
}
}
int ide_cd_queue_pc(ide_drive_t *drive, const unsigned char *cmd,
int write, void *buffer, unsigned *bufflen,
struct request_sense *sense, int timeout,
unsigned int cmd_flags)
{
struct cdrom_info *info = drive->driver_data;
struct request_sense local_sense;
int retries = 10;
unsigned int flags = 0;
if (!sense)
sense = &local_sense;
ide_debug_log(IDE_DBG_PC, "Call %s, rq->cmd[0]: 0x%x, write: 0x%x, "
"timeout: %d, cmd_flags: 0x%x\n", __func__, cmd[0], write,
timeout, cmd_flags);
/* start of retry loop */
do {
struct request *rq;
int error;
rq = blk_get_request(drive->queue, write, __GFP_WAIT);
memcpy(rq->cmd, cmd, BLK_MAX_CDB);
rq->cmd_type = REQ_TYPE_ATA_PC;
rq->sense = sense;
rq->cmd_flags |= cmd_flags;
rq->timeout = timeout;
if (buffer) {
rq->data = buffer;
rq->data_len = *bufflen;
}
error = blk_execute_rq(drive->queue, info->disk, rq, 0);
if (buffer)
*bufflen = rq->data_len;
flags = rq->cmd_flags;
blk_put_request(rq);
/*
* FIXME: we should probably abort/retry or something in case of
* failure.
*/
if (flags & REQ_FAILED) {
/*
* The request failed. Retry if it was due to a unit
* attention status (usually means media was changed).
*/
struct request_sense *reqbuf = sense;
if (reqbuf->sense_key == UNIT_ATTENTION)
cdrom_saw_media_change(drive);
else if (reqbuf->sense_key == NOT_READY &&
reqbuf->asc == 4 && reqbuf->ascq != 4) {
/*
* The drive is in the process of loading
* a disk. Retry, but wait a little to give
* the drive time to complete the load.
*/
ssleep(2);
} else {
/* otherwise, don't retry */
retries = 0;
}
--retries;
}
/* end of retry loop */
} while ((flags & REQ_FAILED) && retries >= 0);
/* return an error if the command failed */
return (flags & REQ_FAILED) ? -EIO : 0;
}
/*
* Called from blk_end_request_callback() after the data of the request is
* completed and before the request itself is completed. By returning value '1',
* blk_end_request_callback() returns immediately without completing it.
*/
static int cdrom_newpc_intr_dummy_cb(struct request *rq)
{
return 1;
}
static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive)
{
ide_hwif_t *hwif = drive->hwif;
struct request *rq = HWGROUP(drive)->rq;
xfer_func_t *xferfunc;
ide_expiry_t *expiry = NULL;
int dma_error = 0, dma, stat, thislen, uptodate = 0;
int write = (rq_data_dir(rq) == WRITE) ? 1 : 0;
unsigned int timeout;
u16 len;
u8 ireason;
ide_debug_log(IDE_DBG_PC, "Call %s, rq->cmd[0]: 0x%x, write: 0x%x\n",
__func__, rq->cmd[0], write);
/* check for errors */
dma = drive->dma;
if (dma) {
drive->dma = 0;
dma_error = hwif->dma_ops->dma_end(drive);
if (dma_error) {
printk(KERN_ERR PFX "%s: DMA %s error\n", drive->name,
write ? "write" : "read");
ide_dma_off(drive);
}
}
if (cdrom_decode_status(drive, 0, &stat))
return ide_stopped;
/* using dma, transfer is complete now */
if (dma) {
if (dma_error)
return ide_error(drive, "dma error", stat);
if (blk_fs_request(rq)) {
ide_end_request(drive, 1, rq->nr_sectors);
return ide_stopped;
}
goto end_request;
}
ide_read_bcount_and_ireason(drive, &len, &ireason);
thislen = blk_fs_request(rq) ? len : rq->data_len;
if (thislen > len)
thislen = len;
ide_debug_log(IDE_DBG_PC, "%s: DRQ: stat: 0x%x, thislen: %d\n",
__func__, stat, thislen);
/* If DRQ is clear, the command has completed. */
if ((stat & ATA_DRQ) == 0) {
if (blk_fs_request(rq)) {
/*
* If we're not done reading/writing, complain.
* Otherwise, complete the command normally.
*/
uptodate = 1;
if (rq->current_nr_sectors > 0) {
printk(KERN_ERR PFX "%s: %s: data underrun "
"(%d blocks)\n",
drive->name, __func__,
rq->current_nr_sectors);
if (!write)
rq->cmd_flags |= REQ_FAILED;
uptodate = 0;
}
cdrom_end_request(drive, uptodate);
return ide_stopped;
} else if (!blk_pc_request(rq)) {
ide_cd_request_sense_fixup(drive, rq);
/* complain if we still have data left to transfer */
uptodate = rq->data_len ? 0 : 1;
}
goto end_request;
}
/* check which way to transfer data */
if (ide_cd_check_ireason(drive, rq, len, ireason, write))
return ide_stopped;
if (blk_fs_request(rq)) {
if (write == 0) {
int nskip;
if (ide_cd_check_transfer_size(drive, len)) {
cdrom_end_request(drive, 0);
return ide_stopped;
}
/*
* First, figure out if we need to bit-bucket
* any of the leading sectors.
*/
nskip = min_t(int, rq->current_nr_sectors
- bio_cur_sectors(rq->bio),
thislen >> 9);
if (nskip > 0) {
ide_pad_transfer(drive, write, nskip << 9);
rq->current_nr_sectors -= nskip;
thislen -= (nskip << 9);
}
}
}
if (ireason == 0) {
write = 1;
xferfunc = hwif->tp_ops->output_data;
} else {
write = 0;
xferfunc = hwif->tp_ops->input_data;
}
ide_debug_log(IDE_DBG_PC, "%s: data transfer, rq->cmd_type: 0x%x, "
"ireason: 0x%x\n", __func__, rq->cmd_type, ireason);
/* transfer data */
while (thislen > 0) {
u8 *ptr = blk_fs_request(rq) ? NULL : rq->data;
int blen = rq->data_len;
/* bio backed? */
if (rq->bio) {
if (blk_fs_request(rq)) {
ptr = rq->buffer;
blen = rq->current_nr_sectors << 9;
} else {
ptr = bio_data(rq->bio);
blen = bio_iovec(rq->bio)->bv_len;
}
}
if (!ptr) {
if (blk_fs_request(rq) && !write)
/*
* If the buffers are full, pipe the rest into
* oblivion.
*/
ide_pad_transfer(drive, 0, thislen);
else {
printk(KERN_ERR PFX "%s: confused, missing data\n",
drive->name);
blk_dump_rq_flags(rq, rq_data_dir(rq)
? "cdrom_newpc_intr, write"
: "cdrom_newpc_intr, read");
}
break;
}
if (blen > thislen)
blen = thislen;
xferfunc(drive, NULL, ptr, blen);
thislen -= blen;
len -= blen;
if (blk_fs_request(rq)) {
rq->buffer += blen;
rq->nr_sectors -= (blen >> 9);
rq->current_nr_sectors -= (blen >> 9);
rq->sector += (blen >> 9);
if (rq->current_nr_sectors == 0 && rq->nr_sectors)
cdrom_end_request(drive, 1);
} else {
rq->data_len -= blen;
/*
* The request can't be completed until DRQ is cleared.
* So complete the data, but don't complete the request
* using the dummy function for the callback feature
* of blk_end_request_callback().
*/
if (rq->bio)
blk_end_request_callback(rq, 0, blen,
cdrom_newpc_intr_dummy_cb);
else
rq->data += blen;
}
if (!write && blk_sense_request(rq))
rq->sense_len += blen;
}
/* pad, if necessary */
if (!blk_fs_request(rq) && len > 0)
ide_pad_transfer(drive, write, len);
if (blk_pc_request(rq)) {
timeout = rq->timeout;
} else {
timeout = ATAPI_WAIT_PC;
if (!blk_fs_request(rq))
expiry = cdrom_timer_expiry;
}
ide_set_handler(drive, cdrom_newpc_intr, timeout, expiry);
return ide_started;
end_request:
if (blk_pc_request(rq)) {
unsigned long flags;
unsigned int dlen = rq->data_len;
if (dma)
rq->data_len = 0;
spin_lock_irqsave(&ide_lock, flags);
if (__blk_end_request(rq, 0, dlen))
BUG();
HWGROUP(drive)->rq = NULL;
spin_unlock_irqrestore(&ide_lock, flags);
} else {
if (!uptodate)
rq->cmd_flags |= REQ_FAILED;
cdrom_end_request(drive, uptodate);
}
return ide_stopped;
}
static ide_startstop_t cdrom_start_rw(ide_drive_t *drive, struct request *rq)
{
struct cdrom_info *cd = drive->driver_data;
int write = rq_data_dir(rq) == WRITE;
unsigned short sectors_per_frame =
queue_hardsect_size(drive->queue) >> SECTOR_BITS;
ide_debug_log(IDE_DBG_RQ, "Call %s, write: 0x%x, secs_per_frame: %u\n",
__func__, write, sectors_per_frame);
if (write) {
/* disk has become write protected */
if (get_disk_ro(cd->disk)) {
cdrom_end_request(drive, 0);
return ide_stopped;
}
} else {
/*
* We may be retrying this request after an error. Fix up any
* weirdness which might be present in the request packet.
*/
ide_cd_restore_request(drive, rq);
}
/* use DMA, if possible / writes *must* be hardware frame aligned */
if ((rq->nr_sectors & (sectors_per_frame - 1)) ||
(rq->sector & (sectors_per_frame - 1))) {
if (write) {
cdrom_end_request(drive, 0);
return ide_stopped;
}
drive->dma = 0;
} else
drive->dma = !!(drive->dev_flags & IDE_DFLAG_USING_DMA);
if (write)
cd->devinfo.media_written = 1;
return ide_started;
}
static ide_startstop_t cdrom_do_newpc_cont(ide_drive_t *drive)
{
struct request *rq = HWGROUP(drive)->rq;
return cdrom_transfer_packet_command(drive, rq, cdrom_newpc_intr);
}
static void cdrom_do_block_pc(ide_drive_t *drive, struct request *rq)
{
ide_debug_log(IDE_DBG_PC, "Call %s, rq->cmd_type: 0x%x\n", __func__,
rq->cmd_type);
if (blk_pc_request(rq))
rq->cmd_flags |= REQ_QUIET;
else
rq->cmd_flags &= ~REQ_FAILED;
drive->dma = 0;
/* sg request */
if (rq->bio || ((rq->cmd_type == REQ_TYPE_ATA_PC) && rq->data_len)) {
struct request_queue *q = drive->queue;
unsigned int alignment;
char *buf;
if (rq->bio)
buf = bio_data(rq->bio);
else
buf = rq->data;
drive->dma = !!(drive->dev_flags & IDE_DFLAG_USING_DMA);
/*
* check if dma is safe
*
* NOTE! The "len" and "addr" checks should possibly have
* separate masks.
*/
alignment = queue_dma_alignment(q) | q->dma_pad_mask;
if ((unsigned long)buf & alignment || rq->data_len & alignment
|| object_is_on_stack(buf))
drive->dma = 0;
}
}
/*
* cdrom driver request routine.
*/
static ide_startstop_t ide_cd_do_request(ide_drive_t *drive, struct request *rq,
sector_t block)
{
struct cdrom_info *info = drive->driver_data;
ide_handler_t *fn;
int xferlen;
ide_debug_log(IDE_DBG_RQ, "Call %s, rq->cmd_type: 0x%x, block: %llu\n",
__func__, rq->cmd_type, (unsigned long long)block);
if (blk_fs_request(rq)) {
if (drive->atapi_flags & IDE_AFLAG_SEEKING) {
ide_hwif_t *hwif = drive->hwif;
unsigned long elapsed = jiffies - info->start_seek;
int stat = hwif->tp_ops->read_status(hwif);
if ((stat & ATA_DSC) != ATA_DSC) {
if (elapsed < IDECD_SEEK_TIMEOUT) {
ide_stall_queue(drive,
IDECD_SEEK_TIMER);
return ide_stopped;
}
printk(KERN_ERR PFX "%s: DSC timeout\n",
drive->name);
}
drive->atapi_flags &= ~IDE_AFLAG_SEEKING;
}
if (rq_data_dir(rq) == READ &&
IDE_LARGE_SEEK(info->last_block, block,
IDECD_SEEK_THRESHOLD) &&
(drive->dev_flags & IDE_DFLAG_DSC_OVERLAP)) {
xferlen = 0;
fn = cdrom_start_seek_continuation;
drive->dma = 0;
info->start_seek = jiffies;
ide_cd_prepare_seek_request(drive, rq);
} else {
xferlen = 32768;
fn = cdrom_start_rw_cont;
if (cdrom_start_rw(drive, rq) == ide_stopped)
return ide_stopped;
if (ide_cd_prepare_rw_request(drive, rq) == ide_stopped)
return ide_stopped;
}
info->last_block = block;
} else if (blk_sense_request(rq) || blk_pc_request(rq) ||
rq->cmd_type == REQ_TYPE_ATA_PC) {
xferlen = rq->data_len;
fn = cdrom_do_newpc_cont;
if (!rq->timeout)
rq->timeout = ATAPI_WAIT_PC;
cdrom_do_block_pc(drive, rq);
} else if (blk_special_request(rq)) {
/* right now this can only be a reset... */
cdrom_end_request(drive, 1);
return ide_stopped;
} else {
blk_dump_rq_flags(rq, DRV_NAME " bad flags");
cdrom_end_request(drive, 0);
return ide_stopped;
}
return cdrom_start_packet_command(drive, xferlen, fn);
}
/*
* Ioctl handling.
*
* Routines which queue packet commands take as a final argument a pointer to a
* request_sense struct. If execution of the command results in an error with a
* CHECK CONDITION status, this structure will be filled with the results of the
* subsequent request sense command. The pointer can also be NULL, in which case
* no sense information is returned.
*/
static void msf_from_bcd(struct atapi_msf *msf)
{
msf->minute = bcd2bin(msf->minute);
msf->second = bcd2bin(msf->second);
msf->frame = bcd2bin(msf->frame);
}
int cdrom_check_status(ide_drive_t *drive, struct request_sense *sense)
{
struct cdrom_info *info = drive->driver_data;
struct cdrom_device_info *cdi = &info->devinfo;
unsigned char cmd[BLK_MAX_CDB];
ide_debug_log(IDE_DBG_FUNC, "Call %s\n", __func__);
memset(cmd, 0, BLK_MAX_CDB);
cmd[0] = GPCMD_TEST_UNIT_READY;
/*
* Sanyo 3 CD changer uses byte 7 of TEST_UNIT_READY to switch CDs
* instead of supporting the LOAD_UNLOAD opcode.
*/
cmd[7] = cdi->sanyo_slot % 3;
return ide_cd_queue_pc(drive, cmd, 0, NULL, NULL, sense, 0, REQ_QUIET);
}
static int cdrom_read_capacity(ide_drive_t *drive, unsigned long *capacity,
unsigned long *sectors_per_frame,
struct request_sense *sense)
{
struct {
__be32 lba;
__be32 blocklen;
} capbuf;
int stat;
unsigned char cmd[BLK_MAX_CDB];
unsigned len = sizeof(capbuf);
u32 blocklen;
ide_debug_log(IDE_DBG_FUNC, "Call %s\n", __func__);
memset(cmd, 0, BLK_MAX_CDB);
cmd[0] = GPCMD_READ_CDVD_CAPACITY;
stat = ide_cd_queue_pc(drive, cmd, 0, &capbuf, &len, sense, 0,
REQ_QUIET);
if (stat)
return stat;
/*
* Sanity check the given block size
*/
blocklen = be32_to_cpu(capbuf.blocklen);
switch (blocklen) {
case 512:
case 1024:
case 2048:
case 4096:
break;
default:
printk(KERN_ERR PFX "%s: weird block size %u\n",
drive->name, blocklen);
printk(KERN_ERR PFX "%s: default to 2kb block size\n",
drive->name);
blocklen = 2048;
break;
}
*capacity = 1 + be32_to_cpu(capbuf.lba);
*sectors_per_frame = blocklen >> SECTOR_BITS;
return 0;
}
static int cdrom_read_tocentry(ide_drive_t *drive, int trackno, int msf_flag,
int format, char *buf, int buflen,
struct request_sense *sense)
{
unsigned char cmd[BLK_MAX_CDB];
ide_debug_log(IDE_DBG_FUNC, "Call %s\n", __func__);
memset(cmd, 0, BLK_MAX_CDB);
cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
cmd[6] = trackno;
cmd[7] = (buflen >> 8);
cmd[8] = (buflen & 0xff);
cmd[9] = (format << 6);
if (msf_flag)
cmd[1] = 2;
return ide_cd_queue_pc(drive, cmd, 0, buf, &buflen, sense, 0, REQ_QUIET);
}
/* Try to read the entire TOC for the disk into our internal buffer. */
int ide_cd_read_toc(ide_drive_t *drive, struct request_sense *sense)
{
int stat, ntracks, i;
struct cdrom_info *info = drive->driver_data;
struct cdrom_device_info *cdi = &info->devinfo;
struct atapi_toc *toc = info->toc;
struct {
struct atapi_toc_header hdr;
struct atapi_toc_entry ent;
} ms_tmp;
long last_written;
unsigned long sectors_per_frame = SECTORS_PER_FRAME;
ide_debug_log(IDE_DBG_FUNC, "Call %s\n", __func__);
if (toc == NULL) {
/* try to allocate space */
toc = kmalloc(sizeof(struct atapi_toc), GFP_KERNEL);
if (toc == NULL) {
printk(KERN_ERR PFX "%s: No cdrom TOC buffer!\n",
drive->name);
return -ENOMEM;
}
info->toc = toc;
}
/*
* Check to see if the existing data is still valid. If it is,
* just return.
*/
(void) cdrom_check_status(drive, sense);
if (drive->atapi_flags & IDE_AFLAG_TOC_VALID)
return 0;
/* try to get the total cdrom capacity and sector size */
stat = cdrom_read_capacity(drive, &toc->capacity, &sectors_per_frame,
sense);
if (stat)
toc->capacity = 0x1fffff;
set_capacity(info->disk, toc->capacity * sectors_per_frame);
/* save a private copy of the TOC capacity for error handling */
drive->probed_capacity = toc->capacity * sectors_per_frame;
blk_queue_hardsect_size(drive->queue,
sectors_per_frame << SECTOR_BITS);
/* first read just the header, so we know how long the TOC is */
stat = cdrom_read_tocentry(drive, 0, 1, 0, (char *) &toc->hdr,
sizeof(struct atapi_toc_header), sense);
if (stat)
return stat;
if (drive->atapi_flags & IDE_AFLAG_TOCTRACKS_AS_BCD) {
toc->hdr.first_track = bcd2bin(toc->hdr.first_track);
toc->hdr.last_track = bcd2bin(toc->hdr.last_track);
}
ntracks = toc->hdr.last_track - toc->hdr.first_track + 1;
if (ntracks <= 0)
return -EIO;
if (ntracks > MAX_TRACKS)
ntracks = MAX_TRACKS;
/* now read the whole schmeer */
stat = cdrom_read_tocentry(drive, toc->hdr.first_track, 1, 0,
(char *)&toc->hdr,
sizeof(struct atapi_toc_header) +
(ntracks + 1) *
sizeof(struct atapi_toc_entry), sense);
if (stat && toc->hdr.first_track > 1) {
/*
* Cds with CDI tracks only don't have any TOC entries, despite
* of this the returned values are
* first_track == last_track = number of CDI tracks + 1,
* so that this case is indistinguishable from the same layout
* plus an additional audio track. If we get an error for the
* regular case, we assume a CDI without additional audio
* tracks. In this case the readable TOC is empty (CDI tracks
* are not included) and only holds the Leadout entry.
*
* Heiko Eißfeldt.
*/
ntracks = 0;
stat = cdrom_read_tocentry(drive, CDROM_LEADOUT, 1, 0,
(char *)&toc->hdr,
sizeof(struct atapi_toc_header) +
(ntracks + 1) *
sizeof(struct atapi_toc_entry),
sense);
if (stat)
return stat;
if (drive->atapi_flags & IDE_AFLAG_TOCTRACKS_AS_BCD) {
toc->hdr.first_track = (u8)bin2bcd(CDROM_LEADOUT);
toc->hdr.last_track = (u8)bin2bcd(CDROM_LEADOUT);
} else {
toc->hdr.first_track = CDROM_LEADOUT;
toc->hdr.last_track = CDROM_LEADOUT;
}
}
if (stat)
return stat;
toc->hdr.toc_length = be16_to_cpu(toc->hdr.toc_length);
if (drive->atapi_flags & IDE_AFLAG_TOCTRACKS_AS_BCD) {
toc->hdr.first_track = bcd2bin(toc->hdr.first_track);
toc->hdr.last_track = bcd2bin(toc->hdr.last_track);
}
for (i = 0; i <= ntracks; i++) {
if (drive->atapi_flags & IDE_AFLAG_TOCADDR_AS_BCD) {
if (drive->atapi_flags & IDE_AFLAG_TOCTRACKS_AS_BCD)
toc->ent[i].track = bcd2bin(toc->ent[i].track);
msf_from_bcd(&toc->ent[i].addr.msf);
}
toc->ent[i].addr.lba = msf_to_lba(toc->ent[i].addr.msf.minute,
toc->ent[i].addr.msf.second,
toc->ent[i].addr.msf.frame);
}
if (toc->hdr.first_track != CDROM_LEADOUT) {
/* read the multisession information */
stat = cdrom_read_tocentry(drive, 0, 0, 1, (char *)&ms_tmp,
sizeof(ms_tmp), sense);
if (stat)
return stat;
toc->last_session_lba = be32_to_cpu(ms_tmp.ent.addr.lba);
} else {
ms_tmp.hdr.last_track = CDROM_LEADOUT;
ms_tmp.hdr.first_track = ms_tmp.hdr.last_track;
toc->last_session_lba = msf_to_lba(0, 2, 0); /* 0m 2s 0f */
}
if (drive->atapi_flags & IDE_AFLAG_TOCADDR_AS_BCD) {
/* re-read multisession information using MSF format */
stat = cdrom_read_tocentry(drive, 0, 1, 1, (char *)&ms_tmp,
sizeof(ms_tmp), sense);
if (stat)
return stat;
msf_from_bcd(&ms_tmp.ent.addr.msf);
toc->last_session_lba = msf_to_lba(ms_tmp.ent.addr.msf.minute,
ms_tmp.ent.addr.msf.second,
ms_tmp.ent.addr.msf.frame);
}
toc->xa_flag = (ms_tmp.hdr.first_track != ms_tmp.hdr.last_track);
/* now try to get the total cdrom capacity */
stat = cdrom_get_last_written(cdi, &last_written);
if (!stat && (last_written > toc->capacity)) {
toc->capacity = last_written;
set_capacity(info->disk, toc->capacity * sectors_per_frame);
drive->probed_capacity = toc->capacity * sectors_per_frame;
}
/* Remember that we've read this stuff. */
drive->atapi_flags |= IDE_AFLAG_TOC_VALID;
return 0;
}
int ide_cdrom_get_capabilities(ide_drive_t *drive, u8 *buf)
{
struct cdrom_info *info = drive->driver_data;
struct cdrom_device_info *cdi = &info->devinfo;
struct packet_command cgc;
int stat, attempts = 3, size = ATAPI_CAPABILITIES_PAGE_SIZE;
ide_debug_log(IDE_DBG_FUNC, "Call %s\n", __func__);
if ((drive->atapi_flags & IDE_AFLAG_FULL_CAPS_PAGE) == 0)
size -= ATAPI_CAPABILITIES_PAGE_PAD_SIZE;
init_cdrom_command(&cgc, buf, size, CGC_DATA_UNKNOWN);
do {
/* we seem to get stat=0x01,err=0x00 the first time (??) */
stat = cdrom_mode_sense(cdi, &cgc, GPMODE_CAPABILITIES_PAGE, 0);
if (!stat)
break;
} while (--attempts);
return stat;
}
void ide_cdrom_update_speed(ide_drive_t *drive, u8 *buf)
{
struct cdrom_info *cd = drive->driver_data;
u16 curspeed, maxspeed;
ide_debug_log(IDE_DBG_FUNC, "Call %s\n", __func__);
if (drive->atapi_flags & IDE_AFLAG_LE_SPEED_FIELDS) {
curspeed = le16_to_cpup((__le16 *)&buf[8 + 14]);
maxspeed = le16_to_cpup((__le16 *)&buf[8 + 8]);
} else {
curspeed = be16_to_cpup((__be16 *)&buf[8 + 14]);
maxspeed = be16_to_cpup((__be16 *)&buf[8 + 8]);
}
cd->current_speed = (curspeed + (176/2)) / 176;
cd->max_speed = (maxspeed + (176/2)) / 176;
}
#define IDE_CD_CAPABILITIES \
(CDC_CLOSE_TRAY | CDC_OPEN_TRAY | CDC_LOCK | CDC_SELECT_SPEED | \
CDC_SELECT_DISC | CDC_MULTI_SESSION | CDC_MCN | CDC_MEDIA_CHANGED | \
CDC_PLAY_AUDIO | CDC_RESET | CDC_DRIVE_STATUS | CDC_CD_R | \
CDC_CD_RW | CDC_DVD | CDC_DVD_R | CDC_DVD_RAM | CDC_GENERIC_PACKET | \
CDC_MO_DRIVE | CDC_MRW | CDC_MRW_W | CDC_RAM)
static struct cdrom_device_ops ide_cdrom_dops = {
.open = ide_cdrom_open_real,
.release = ide_cdrom_release_real,
.drive_status = ide_cdrom_drive_status,
.media_changed = ide_cdrom_check_media_change_real,
.tray_move = ide_cdrom_tray_move,
.lock_door = ide_cdrom_lock_door,
.select_speed = ide_cdrom_select_speed,
.get_last_session = ide_cdrom_get_last_session,
.get_mcn = ide_cdrom_get_mcn,
.reset = ide_cdrom_reset,
.audio_ioctl = ide_cdrom_audio_ioctl,
.capability = IDE_CD_CAPABILITIES,
.generic_packet = ide_cdrom_packet,
};
static int ide_cdrom_register(ide_drive_t *drive, int nslots)
{
struct cdrom_info *info = drive->driver_data;
struct cdrom_device_info *devinfo = &info->devinfo;
ide_debug_log(IDE_DBG_PROBE, "Call %s, nslots: %d\n", __func__, nslots);
devinfo->ops = &ide_cdrom_dops;
devinfo->speed = info->current_speed;
devinfo->capacity = nslots;
devinfo->handle = drive;
strcpy(devinfo->name, drive->name);
if (drive->atapi_flags & IDE_AFLAG_NO_SPEED_SELECT)
devinfo->mask |= CDC_SELECT_SPEED;
devinfo->disk = info->disk;
return register_cdrom(devinfo);
}
static int ide_cdrom_probe_capabilities(ide_drive_t *drive)
{
struct cdrom_info *cd = drive->driver_data;
struct cdrom_device_info *cdi = &cd->devinfo;
u8 buf[ATAPI_CAPABILITIES_PAGE_SIZE];
mechtype_t mechtype;
int nslots = 1;
ide_debug_log(IDE_DBG_PROBE, "Call %s, drive->media: 0x%x, "
"drive->atapi_flags: 0x%lx\n", __func__, drive->media,
drive->atapi_flags);
cdi->mask = (CDC_CD_R | CDC_CD_RW | CDC_DVD | CDC_DVD_R |
CDC_DVD_RAM | CDC_SELECT_DISC | CDC_PLAY_AUDIO |
CDC_MO_DRIVE | CDC_RAM);
if (drive->media == ide_optical) {
cdi->mask &= ~(CDC_MO_DRIVE | CDC_RAM);
printk(KERN_ERR PFX "%s: ATAPI magneto-optical drive\n",
drive->name);
return nslots;
}
if (drive->atapi_flags & IDE_AFLAG_PRE_ATAPI12) {
drive->atapi_flags &= ~IDE_AFLAG_NO_EJECT;
cdi->mask &= ~CDC_PLAY_AUDIO;
return nslots;
}
/*
* We have to cheat a little here. the packet will eventually be queued
* with ide_cdrom_packet(), which extracts the drive from cdi->handle.
* Since this device hasn't been registered with the Uniform layer yet,
* it can't do this. Same goes for cdi->ops.
*/
cdi->handle = drive;
cdi->ops = &ide_cdrom_dops;
if (ide_cdrom_get_capabilities(drive, buf))
return 0;
if ((buf[8 + 6] & 0x01) == 0)
drive->atapi_flags |= IDE_AFLAG_NO_DOORLOCK;
if (buf[8 + 6] & 0x08)
drive->atapi_flags &= ~IDE_AFLAG_NO_EJECT;
if (buf[8 + 3] & 0x01)
cdi->mask &= ~CDC_CD_R;
if (buf[8 + 3] & 0x02)
cdi->mask &= ~(CDC_CD_RW | CDC_RAM);
if (buf[8 + 2] & 0x38)
cdi->mask &= ~CDC_DVD;
if (buf[8 + 3] & 0x20)
cdi->mask &= ~(CDC_DVD_RAM | CDC_RAM);
if (buf[8 + 3] & 0x10)
cdi->mask &= ~CDC_DVD_R;
if ((buf[8 + 4] & 0x01) || (drive->atapi_flags & IDE_AFLAG_PLAY_AUDIO_OK))
cdi->mask &= ~CDC_PLAY_AUDIO;
mechtype = buf[8 + 6] >> 5;
if (mechtype == mechtype_caddy ||
mechtype == mechtype_popup ||
(drive->atapi_flags & IDE_AFLAG_NO_AUTOCLOSE))
cdi->mask |= CDC_CLOSE_TRAY;
if (cdi->sanyo_slot > 0) {
cdi->mask &= ~CDC_SELECT_DISC;
nslots = 3;
} else if (mechtype == mechtype_individual_changer ||
mechtype == mechtype_cartridge_changer) {
nslots = cdrom_number_of_slots(cdi);
if (nslots > 1)
cdi->mask &= ~CDC_SELECT_DISC;
}
ide_cdrom_update_speed(drive, buf);
printk(KERN_INFO PFX "%s: ATAPI", drive->name);
/* don't print speed if the drive reported 0 */
if (cd->max_speed)
printk(KERN_CONT " %dX", cd->max_speed);
printk(KERN_CONT " %s", (cdi->mask & CDC_DVD) ? "CD-ROM" : "DVD-ROM");
if ((cdi->mask & CDC_DVD_R) == 0 || (cdi->mask & CDC_DVD_RAM) == 0)
printk(KERN_CONT " DVD%s%s",
(cdi->mask & CDC_DVD_R) ? "" : "-R",
(cdi->mask & CDC_DVD_RAM) ? "" : "-RAM");
if ((cdi->mask & CDC_CD_R) == 0 || (cdi->mask & CDC_CD_RW) == 0)
printk(KERN_CONT " CD%s%s",
(cdi->mask & CDC_CD_R) ? "" : "-R",
(cdi->mask & CDC_CD_RW) ? "" : "/RW");
if ((cdi->mask & CDC_SELECT_DISC) == 0)
printk(KERN_CONT " changer w/%d slots", nslots);
else
printk(KERN_CONT " drive");
printk(KERN_CONT ", %dkB Cache\n",
be16_to_cpup((__be16 *)&buf[8 + 12]));
return nslots;
}
/* standard prep_rq_fn that builds 10 byte cmds */
static int ide_cdrom_prep_fs(struct request_queue *q, struct request *rq)
{
int hard_sect = queue_hardsect_size(q);
long block = (long)rq->hard_sector / (hard_sect >> 9);
unsigned long blocks = rq->hard_nr_sectors / (hard_sect >> 9);
memset(rq->cmd, 0, BLK_MAX_CDB);
if (rq_data_dir(rq) == READ)
rq->cmd[0] = GPCMD_READ_10;
else
rq->cmd[0] = GPCMD_WRITE_10;
/*
* fill in lba
*/
rq->cmd[2] = (block >> 24) & 0xff;
rq->cmd[3] = (block >> 16) & 0xff;
rq->cmd[4] = (block >> 8) & 0xff;
rq->cmd[5] = block & 0xff;
/*
* and transfer length
*/
rq->cmd[7] = (blocks >> 8) & 0xff;
rq->cmd[8] = blocks & 0xff;
rq->cmd_len = 10;
return BLKPREP_OK;
}
/*
* Most of the SCSI commands are supported directly by ATAPI devices.
* This transform handles the few exceptions.
*/
static int ide_cdrom_prep_pc(struct request *rq)
{
u8 *c = rq->cmd;
/* transform 6-byte read/write commands to the 10-byte version */
if (c[0] == READ_6 || c[0] == WRITE_6) {
c[8] = c[4];
c[5] = c[3];
c[4] = c[2];
c[3] = c[1] & 0x1f;
c[2] = 0;
c[1] &= 0xe0;
c[0] += (READ_10 - READ_6);
rq->cmd_len = 10;
return BLKPREP_OK;
}
/*
* it's silly to pretend we understand 6-byte sense commands, just
* reject with ILLEGAL_REQUEST and the caller should take the
* appropriate action
*/
if (c[0] == MODE_SENSE || c[0] == MODE_SELECT) {
rq->errors = ILLEGAL_REQUEST;
return BLKPREP_KILL;
}
return BLKPREP_OK;
}
static int ide_cdrom_prep_fn(struct request_queue *q, struct request *rq)
{
if (blk_fs_request(rq))
return ide_cdrom_prep_fs(q, rq);
else if (blk_pc_request(rq))
return ide_cdrom_prep_pc(rq);
return 0;
}
struct cd_list_entry {
const char *id_model;
const char *id_firmware;
unsigned int cd_flags;
};
#ifdef CONFIG_IDE_PROC_FS
static sector_t ide_cdrom_capacity(ide_drive_t *drive)
{
unsigned long capacity, sectors_per_frame;
if (cdrom_read_capacity(drive, &capacity, &sectors_per_frame, NULL))
return 0;
return capacity * sectors_per_frame;
}
static int proc_idecd_read_capacity(char *page, char **start, off_t off,
int count, int *eof, void *data)
{
ide_drive_t *drive = data;
int len;
len = sprintf(page, "%llu\n", (long long)ide_cdrom_capacity(drive));
PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
}
static ide_proc_entry_t idecd_proc[] = {
{ "capacity", S_IFREG|S_IRUGO, proc_idecd_read_capacity, NULL },
{ NULL, 0, NULL, NULL }
};
ide_devset_rw_flag(dsc_overlap, IDE_DFLAG_DSC_OVERLAP);
static const struct ide_proc_devset idecd_settings[] = {
IDE_PROC_DEVSET(dsc_overlap, 0, 1),
{ 0 },
};
#endif
static const struct cd_list_entry ide_cd_quirks_list[] = {
/* Limit transfer size per interrupt. */
{ "SAMSUNG CD-ROM SCR-2430", NULL, IDE_AFLAG_LIMIT_NFRAMES },
{ "SAMSUNG CD-ROM SCR-2432", NULL, IDE_AFLAG_LIMIT_NFRAMES },
/* SCR-3231 doesn't support the SET_CD_SPEED command. */
{ "SAMSUNG CD-ROM SCR-3231", NULL, IDE_AFLAG_NO_SPEED_SELECT },
/* Old NEC260 (not R) was released before ATAPI 1.2 spec. */
{ "NEC CD-ROM DRIVE:260", "1.01", IDE_AFLAG_TOCADDR_AS_BCD |
IDE_AFLAG_PRE_ATAPI12, },
/* Vertos 300, some versions of this drive like to talk BCD. */
{ "V003S0DS", NULL, IDE_AFLAG_VERTOS_300_SSD, },
/* Vertos 600 ESD. */
{ "V006E0DS", NULL, IDE_AFLAG_VERTOS_600_ESD, },
/*
* Sanyo 3 CD changer uses a non-standard command for CD changing
* (by default standard ATAPI support for CD changers is used).
*/
{ "CD-ROM CDR-C3 G", NULL, IDE_AFLAG_SANYO_3CD },
{ "CD-ROM CDR-C3G", NULL, IDE_AFLAG_SANYO_3CD },
{ "CD-ROM CDR_C36", NULL, IDE_AFLAG_SANYO_3CD },
/* Stingray 8X CD-ROM. */
{ "STINGRAY 8422 IDE 8X CD-ROM 7-27-95", NULL, IDE_AFLAG_PRE_ATAPI12 },
/*
* ACER 50X CD-ROM and WPI 32X CD-ROM require the full spec length
* mode sense page capabilities size, but older drives break.
*/
{ "ATAPI CD ROM DRIVE 50X MAX", NULL, IDE_AFLAG_FULL_CAPS_PAGE },
{ "WPI CDS-32X", NULL, IDE_AFLAG_FULL_CAPS_PAGE },
/* ACER/AOpen 24X CD-ROM has the speed fields byte-swapped. */
{ "", "241N", IDE_AFLAG_LE_SPEED_FIELDS },
/*
* Some drives used by Apple don't advertise audio play
* but they do support reading TOC & audio datas.
*/
{ "MATSHITADVD-ROM SR-8187", NULL, IDE_AFLAG_PLAY_AUDIO_OK },
{ "MATSHITADVD-ROM SR-8186", NULL, IDE_AFLAG_PLAY_AUDIO_OK },
{ "MATSHITADVD-ROM SR-8176", NULL, IDE_AFLAG_PLAY_AUDIO_OK },
{ "MATSHITADVD-ROM SR-8174", NULL, IDE_AFLAG_PLAY_AUDIO_OK },
{ "Optiarc DVD RW AD-5200A", NULL, IDE_AFLAG_PLAY_AUDIO_OK },
{ "Optiarc DVD RW AD-7200A", NULL, IDE_AFLAG_PLAY_AUDIO_OK },
{ "Optiarc DVD RW AD-7543A", NULL, IDE_AFLAG_NO_AUTOCLOSE },
{ NULL, NULL, 0 }
};
static unsigned int ide_cd_flags(u16 *id)
{
const struct cd_list_entry *cle = ide_cd_quirks_list;
while (cle->id_model) {
if (strcmp(cle->id_model, (char *)&id[ATA_ID_PROD]) == 0 &&
(cle->id_firmware == NULL ||
strstr((char *)&id[ATA_ID_FW_REV], cle->id_firmware)))
return cle->cd_flags;
cle++;
}
return 0;
}
static int ide_cdrom_setup(ide_drive_t *drive)
{
struct cdrom_info *cd = drive->driver_data;
struct cdrom_device_info *cdi = &cd->devinfo;
u16 *id = drive->id;
char *fw_rev = (char *)&id[ATA_ID_FW_REV];
int nslots;
ide_debug_log(IDE_DBG_PROBE, "Call %s\n", __func__);
blk_queue_prep_rq(drive->queue, ide_cdrom_prep_fn);
blk_queue_dma_alignment(drive->queue, 31);
blk_queue_update_dma_pad(drive->queue, 15);
drive->queue->unplug_delay = (1 * HZ) / 1000;
if (!drive->queue->unplug_delay)
drive->queue->unplug_delay = 1;
drive->dev_flags |= IDE_DFLAG_MEDIA_CHANGED;
drive->atapi_flags = IDE_AFLAG_NO_EJECT | ide_cd_flags(id);
if ((drive->atapi_flags & IDE_AFLAG_VERTOS_300_SSD) &&
fw_rev[4] == '1' && fw_rev[6] <= '2')
drive->atapi_flags |= (IDE_AFLAG_TOCTRACKS_AS_BCD |
IDE_AFLAG_TOCADDR_AS_BCD);
else if ((drive->atapi_flags & IDE_AFLAG_VERTOS_600_ESD) &&
fw_rev[4] == '1' && fw_rev[6] <= '2')
drive->atapi_flags |= IDE_AFLAG_TOCTRACKS_AS_BCD;
else if (drive->atapi_flags & IDE_AFLAG_SANYO_3CD)
/* 3 => use CD in slot 0 */
cdi->sanyo_slot = 3;
nslots = ide_cdrom_probe_capabilities(drive);
/* set correct block size */
blk_queue_hardsect_size(drive->queue, CD_FRAMESIZE);
if (drive->next != drive)
drive->dev_flags |= IDE_DFLAG_DSC_OVERLAP;
else
drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP;
if (ide_cdrom_register(drive, nslots)) {
printk(KERN_ERR PFX "%s: %s failed to register device with the"
" cdrom driver.\n", drive->name, __func__);
cd->devinfo.handle = NULL;
return 1;
}
ide_proc_register_driver(drive, cd->driver);
return 0;
}
static void ide_cd_remove(ide_drive_t *drive)
{
struct cdrom_info *info = drive->driver_data;
ide_debug_log(IDE_DBG_FUNC, "Call %s\n", __func__);
ide_proc_unregister_driver(drive, info->driver);
del_gendisk(info->disk);
ide_cd_put(info);
}
static void ide_cd_release(struct kref *kref)
{
struct cdrom_info *info = to_ide_drv(kref, cdrom_info);
struct cdrom_device_info *devinfo = &info->devinfo;
ide_drive_t *drive = info->drive;
struct gendisk *g = info->disk;
ide_debug_log(IDE_DBG_FUNC, "Call %s\n", __func__);
kfree(info->toc);
if (devinfo->handle == drive)
unregister_cdrom(devinfo);
drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP;
drive->driver_data = NULL;
blk_queue_prep_rq(drive->queue, NULL);
g->private_data = NULL;
put_disk(g);
kfree(info);
}
static int ide_cd_probe(ide_drive_t *);
static ide_driver_t ide_cdrom_driver = {
.gen_driver = {
.owner = THIS_MODULE,
.name = "ide-cdrom",
.bus = &ide_bus_type,
},
.probe = ide_cd_probe,
.remove = ide_cd_remove,
.version = IDECD_VERSION,
.do_request = ide_cd_do_request,
.end_request = ide_end_request,
.error = __ide_error,
#ifdef CONFIG_IDE_PROC_FS
.proc = idecd_proc,
.settings = idecd_settings,
#endif
};
static int idecd_open(struct inode *inode, struct file *file)
{
struct gendisk *disk = inode->i_bdev->bd_disk;
struct cdrom_info *info;
int rc = -ENOMEM;
info = ide_cd_get(disk);
if (!info)
return -ENXIO;
rc = cdrom_open(&info->devinfo, inode, file);
if (rc < 0)
ide_cd_put(info);
return rc;
}
static int idecd_release(struct inode *inode, struct file *file)
{
struct gendisk *disk = inode->i_bdev->bd_disk;
struct cdrom_info *info = ide_drv_g(disk, cdrom_info);
cdrom_release(&info->devinfo, file);
ide_cd_put(info);
return 0;
}
static int idecd_set_spindown(struct cdrom_device_info *cdi, unsigned long arg)
{
struct packet_command cgc;
char buffer[16];
int stat;
char spindown;
if (copy_from_user(&spindown, (void __user *)arg, sizeof(char)))
return -EFAULT;
init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_UNKNOWN);
stat = cdrom_mode_sense(cdi, &cgc, GPMODE_CDROM_PAGE, 0);
if (stat)
return stat;
buffer[11] = (buffer[11] & 0xf0) | (spindown & 0x0f);
return cdrom_mode_select(cdi, &cgc);
}
static int idecd_get_spindown(struct cdrom_device_info *cdi, unsigned long arg)
{
struct packet_command cgc;
char buffer[16];
int stat;
char spindown;
init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_UNKNOWN);
stat = cdrom_mode_sense(cdi, &cgc, GPMODE_CDROM_PAGE, 0);
if (stat)
return stat;
spindown = buffer[11] & 0x0f;
if (copy_to_user((void __user *)arg, &spindown, sizeof(char)))
return -EFAULT;
return 0;
}
static int idecd_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
struct block_device *bdev = inode->i_bdev;
struct cdrom_info *info = ide_drv_g(bdev->bd_disk, cdrom_info);
int err;
switch (cmd) {
case CDROMSETSPINDOWN:
return idecd_set_spindown(&info->devinfo, arg);
case CDROMGETSPINDOWN:
return idecd_get_spindown(&info->devinfo, arg);
default:
break;
}
err = generic_ide_ioctl(info->drive, file, bdev, cmd, arg);
if (err == -EINVAL)
err = cdrom_ioctl(file, &info->devinfo, inode, cmd, arg);
return err;
}
static int idecd_media_changed(struct gendisk *disk)
{
struct cdrom_info *info = ide_drv_g(disk, cdrom_info);
return cdrom_media_changed(&info->devinfo);
}
static int idecd_revalidate_disk(struct gendisk *disk)
{
struct cdrom_info *info = ide_drv_g(disk, cdrom_info);
struct request_sense sense;
ide_cd_read_toc(info->drive, &sense);
return 0;
}
static struct block_device_operations idecd_ops = {
.owner = THIS_MODULE,
.open = idecd_open,
.release = idecd_release,
.ioctl = idecd_ioctl,
.media_changed = idecd_media_changed,
.revalidate_disk = idecd_revalidate_disk
};
/* module options */
static char *ignore;
module_param(ignore, charp, 0400);
static unsigned long debug_mask;
module_param(debug_mask, ulong, 0644);
MODULE_DESCRIPTION("ATAPI CD-ROM Driver");
static int ide_cd_probe(ide_drive_t *drive)
{
struct cdrom_info *info;
struct gendisk *g;
struct request_sense sense;
ide_debug_log(IDE_DBG_PROBE, "Call %s, drive->driver_req: %s, "
"drive->media: 0x%x\n", __func__, drive->driver_req,
drive->media);
if (!strstr("ide-cdrom", drive->driver_req))
goto failed;
if (drive->media != ide_cdrom && drive->media != ide_optical)
goto failed;
/* skip drives that we were told to ignore */
if (ignore != NULL) {
if (strstr(ignore, drive->name)) {
printk(KERN_INFO PFX "ignoring drive %s\n",
drive->name);
goto failed;
}
}
drive->debug_mask = debug_mask;
info = kzalloc(sizeof(struct cdrom_info), GFP_KERNEL);
if (info == NULL) {
printk(KERN_ERR PFX "%s: Can't allocate a cdrom structure\n",
drive->name);
goto failed;
}
g = alloc_disk(1 << PARTN_BITS);
if (!g)
goto out_free_cd;
ide_init_disk(g, drive);
kref_init(&info->kref);
info->drive = drive;
info->driver = &ide_cdrom_driver;
info->disk = g;
g->private_data = &info->driver;
drive->driver_data = info;
g->minors = 1;
g->driverfs_dev = &drive->gendev;
g->flags = GENHD_FL_CD | GENHD_FL_REMOVABLE;
if (ide_cdrom_setup(drive)) {
ide_cd_release(&info->kref);
goto failed;
}
ide_cd_read_toc(drive, &sense);
g->fops = &idecd_ops;
g->flags |= GENHD_FL_REMOVABLE;
add_disk(g);
return 0;
out_free_cd:
kfree(info);
failed:
return -ENODEV;
}
static void __exit ide_cdrom_exit(void)
{
driver_unregister(&ide_cdrom_driver.gen_driver);
}
static int __init ide_cdrom_init(void)
{
printk(KERN_INFO DRV_NAME " driver " IDECD_VERSION "\n");
return driver_register(&ide_cdrom_driver.gen_driver);
}
MODULE_ALIAS("ide:*m-cdrom*");
MODULE_ALIAS("ide-cd");
module_init(ide_cdrom_init);
module_exit(ide_cdrom_exit);
MODULE_LICENSE("GPL");