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/*
* sr.c Copyright (C) 1992 David Giller
* Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
*
* adapted from:
* sd.c Copyright (C) 1992 Drew Eckhardt
* Linux scsi disk driver by
* Drew Eckhardt <drew@colorado.edu>
*
* Modified by Eric Youngdale ericy@andante.org to
* add scatter-gather, multiple outstanding request, and other
* enhancements.
*
* Modified by Eric Youngdale eric@andante.org to support loadable
* low-level scsi drivers.
*
* Modified by Thomas Quinot thomas@melchior.cuivre.fdn.fr to
* provide auto-eject.
*
* Modified by Gerd Knorr <kraxel@cs.tu-berlin.de> to support the
* generic cdrom interface
*
* Modified by Jens Axboe <axboe@suse.de> - Uniform sr_packet()
* interface, capabilities probe additions, ioctl cleanups, etc.
*
* Modified by Richard Gooch <rgooch@atnf.csiro.au> to support devfs
*
* Modified by Jens Axboe <axboe@suse.de> - support DVD-RAM
* transparently and loose the GHOST hack
*
* Modified by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
* check resource allocation in sr_init and some cleanups
*
*/
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/cdrom.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <asm/system.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#define MAJOR_NR SCSI_CDROM_MAJOR
#include <linux/blk.h>
#include "scsi.h"
#include "hosts.h"
#include "sr.h"
#include <scsi/scsi_ioctl.h> /* For the door lock/unlock commands */
#include "constants.h"
MODULE_PARM(xa_test, "i"); /* see sr_ioctl.c */
#define MAX_RETRIES 3
#define SR_TIMEOUT (30 * HZ)
static int sr_init(void);
static void sr_finish(void);
static int sr_attach(Scsi_Device *);
static int sr_detect(Scsi_Device *);
static void sr_detach(Scsi_Device *);
static int sr_init_command(Scsi_Cmnd *);
static struct Scsi_Device_Template sr_template =
{
name:"cdrom",
tag:"sr",
scsi_type:TYPE_ROM,
major:SCSI_CDROM_MAJOR,
blk:1,
detect:sr_detect,
init:sr_init,
finish:sr_finish,
attach:sr_attach,
detach:sr_detach,
init_command:sr_init_command
};
Scsi_CD *scsi_CDs;
static int *sr_sizes;
static int *sr_blocksizes;
static int *sr_hardsizes;
static int sr_open(struct cdrom_device_info *, int);
void get_sectorsize(int);
void get_capabilities(int);
static int sr_media_change(struct cdrom_device_info *, int);
static int sr_packet(struct cdrom_device_info *, struct cdrom_generic_command *);
static void sr_release(struct cdrom_device_info *cdi)
{
if (scsi_CDs[MINOR(cdi->dev)].device->sector_size > 2048)
sr_set_blocklength(MINOR(cdi->dev), 2048);
scsi_CDs[MINOR(cdi->dev)].device->access_count--;
if (scsi_CDs[MINOR(cdi->dev)].device->host->hostt->module)
__MOD_DEC_USE_COUNT(scsi_CDs[MINOR(cdi->dev)].device->host->hostt->module);
if (sr_template.module)
__MOD_DEC_USE_COUNT(sr_template.module);
}
static struct cdrom_device_ops sr_dops =
{
open: sr_open,
release: sr_release,
drive_status: sr_drive_status,
media_changed: sr_media_change,
tray_move: sr_tray_move,
lock_door: sr_lock_door,
select_speed: sr_select_speed,
get_last_session: sr_get_last_session,
get_mcn: sr_get_mcn,
reset: sr_reset,
audio_ioctl: sr_audio_ioctl,
dev_ioctl: sr_dev_ioctl,
capability: 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_IOCTLS | CDC_DRIVE_STATUS |
CDC_CD_R | CDC_CD_RW | CDC_DVD | CDC_DVD_R |
CDC_DVD_RAM | CDC_GENERIC_PACKET,
generic_packet: sr_packet,
};
/*
* This function checks to see if the media has been changed in the
* CDROM drive. It is possible that we have already sensed a change,
* or the drive may have sensed one and not yet reported it. We must
* be ready for either case. This function always reports the current
* value of the changed bit. If flag is 0, then the changed bit is reset.
* This function could be done as an ioctl, but we would need to have
* an inode for that to work, and we do not always have one.
*/
int sr_media_change(struct cdrom_device_info *cdi, int slot)
{
int retval;
if (CDSL_CURRENT != slot) {
/* no changer support */
return -EINVAL;
}
retval = scsi_ioctl(scsi_CDs[MINOR(cdi->dev)].device,
SCSI_IOCTL_TEST_UNIT_READY, 0);
if (retval) {
/* Unable to test, unit probably not ready. This usually
* means there is no disc in the drive. Mark as changed,
* and we will figure it out later once the drive is
* available again. */
scsi_CDs[MINOR(cdi->dev)].device->changed = 1;
return 1; /* This will force a flush, if called from
* check_disk_change */
};
retval = scsi_CDs[MINOR(cdi->dev)].device->changed;
scsi_CDs[MINOR(cdi->dev)].device->changed = 0;
/* If the disk changed, the capacity will now be different,
* so we force a re-read of this information */
if (retval) {
/* check multisession offset etc */
sr_cd_check(cdi);
/*
* If the disk changed, the capacity will now be different,
* so we force a re-read of this information
* Force 2048 for the sector size so that filesystems won't
* be trying to use something that is too small if the disc
* has changed.
*/
scsi_CDs[MINOR(cdi->dev)].needs_sector_size = 1;
scsi_CDs[MINOR(cdi->dev)].device->sector_size = 2048;
}
return retval;
}
/*
* rw_intr is the interrupt routine for the device driver. It will be notified on the
* end of a SCSI read / write, and will take on of several actions based on success or failure.
*/
static void rw_intr(Scsi_Cmnd * SCpnt)
{
int result = SCpnt->result;
int this_count = SCpnt->bufflen >> 9;
int good_sectors = (result == 0 ? this_count : 0);
int block_sectors = 0;
int device_nr = DEVICE_NR(SCpnt->request.rq_dev);
#ifdef DEBUG
printk("sr.c done: %x %p\n", result, SCpnt->request.bh->b_data);
#endif
/*
Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial success.
Since this is a relatively rare error condition, no care is taken to
avoid unnecessary additional work such as memcpy's that could be avoided.
*/
if (driver_byte(result) != 0 && /* An error occurred */
SCpnt->sense_buffer[0] == 0xF0 && /* Sense data is valid */
(SCpnt->sense_buffer[2] == MEDIUM_ERROR ||
SCpnt->sense_buffer[2] == VOLUME_OVERFLOW ||
SCpnt->sense_buffer[2] == ILLEGAL_REQUEST)) {
long error_sector = (SCpnt->sense_buffer[3] << 24) |
(SCpnt->sense_buffer[4] << 16) |
(SCpnt->sense_buffer[5] << 8) |
SCpnt->sense_buffer[6];
if (SCpnt->request.bh != NULL)
block_sectors = SCpnt->request.bh->b_size >> 9;
if (block_sectors < 4)
block_sectors = 4;
if (scsi_CDs[device_nr].device->sector_size == 2048)
error_sector <<= 2;
error_sector &= ~(block_sectors - 1);
good_sectors = error_sector - SCpnt->request.sector;
if (good_sectors < 0 || good_sectors >= this_count)
good_sectors = 0;
/*
* The SCSI specification allows for the value returned by READ
* CAPACITY to be up to 75 2K sectors past the last readable
* block. Therefore, if we hit a medium error within the last
* 75 2K sectors, we decrease the saved size value.
*/
if ((error_sector >> 1) < sr_sizes[device_nr] &&
scsi_CDs[device_nr].capacity - error_sector < 4 * 75)
sr_sizes[device_nr] = error_sector >> 1;
}
/*
* This calls the generic completion function, now that we know
* how many actual sectors finished, and how many sectors we need
* to say have failed.
*/
scsi_io_completion(SCpnt, good_sectors, block_sectors);
}
static request_queue_t *sr_find_queue(kdev_t dev)
{
/*
* No such device
*/
if (MINOR(dev) >= sr_template.dev_max || !scsi_CDs[MINOR(dev)].device)
return NULL;
return &scsi_CDs[MINOR(dev)].device->request_queue;
}
static int sr_scatter_pad(Scsi_Cmnd *SCpnt, int s_size)
{
struct scatterlist *sg, *old_sg = NULL;
int i, fsize, bsize, sg_ent, sg_count;
char *front, *back;
void **bbpnt, **old_bbpnt = NULL;
back = front = NULL;
sg_ent = SCpnt->use_sg;
bsize = 0; /* gcc... */
/*
* need front pad
*/
if ((fsize = SCpnt->request.sector % (s_size >> 9))) {
fsize <<= 9;
sg_ent++;
if ((front = scsi_malloc(fsize)) == NULL)
goto no_mem;
}
/*
* need a back pad too
*/
if ((bsize = s_size - ((SCpnt->request_bufflen + fsize) % s_size))) {
sg_ent++;
if ((back = scsi_malloc(bsize)) == NULL)
goto no_mem;
}
/*
* extend or allocate new scatter-gather table
*/
sg_count = SCpnt->use_sg;
if (sg_count) {
old_sg = (struct scatterlist *) SCpnt->request_buffer;
old_bbpnt = SCpnt->bounce_buffers;
} else {
sg_count = 1;
sg_ent++;
}
/* Get space for scatterlist and bounce buffer array. */
i = sg_ent * sizeof(struct scatterlist);
i += sg_ent * sizeof(void *);
i = (i + 511) & ~511;
if ((sg = scsi_malloc(i)) == NULL)
goto no_mem;
bbpnt = (void **)
((char *)sg + (sg_ent * sizeof(struct scatterlist)));
/*
* no more failing memory allocs possible, we can safely assign
* SCpnt values now
*/
SCpnt->sglist_len = i;
SCpnt->use_sg = sg_count;
memset(sg, 0, SCpnt->sglist_len);
i = 0;
if (fsize) {
sg[0].address = bbpnt[0] = front;
sg[0].length = fsize;
i++;
}
if (old_sg) {
memcpy(sg + i, old_sg, SCpnt->use_sg * sizeof(struct scatterlist));
memcpy(bbpnt + i, old_bbpnt, SCpnt->use_sg * sizeof(void *));
scsi_free(old_sg, (((SCpnt->use_sg * sizeof(struct scatterlist)) +
(SCpnt->use_sg * sizeof(void *))) + 511) & ~511);
} else {
sg[i].address = SCpnt->request_buffer;
sg[i].length = SCpnt->request_bufflen;
}
SCpnt->request_bufflen += (fsize + bsize);
SCpnt->request_buffer = sg;
SCpnt->bounce_buffers = bbpnt;
SCpnt->use_sg += i;
if (bsize) {
sg[SCpnt->use_sg].address = back;
bbpnt[SCpnt->use_sg] = back;
sg[SCpnt->use_sg].length = bsize;
SCpnt->use_sg++;
}
return 0;
no_mem:
printk("sr: ran out of mem for scatter pad\n");
if (front)
scsi_free(front, fsize);
if (back)
scsi_free(back, bsize);
return 1;
}
static int sr_init_command(Scsi_Cmnd * SCpnt)
{
int dev, devm, block=0, this_count, s_size;
devm = MINOR(SCpnt->request.rq_dev);
dev = DEVICE_NR(SCpnt->request.rq_dev);
SCSI_LOG_HLQUEUE(1, printk("Doing sr request, dev = %d, block = %d\n", devm, block));
if (dev >= sr_template.nr_dev ||
!scsi_CDs[dev].device ||
!scsi_CDs[dev].device->online) {
SCSI_LOG_HLQUEUE(2, printk("Finishing %ld sectors\n", SCpnt->request.nr_sectors));
SCSI_LOG_HLQUEUE(2, printk("Retry with 0x%p\n", SCpnt));
return 0;
}
if (scsi_CDs[dev].device->changed) {
/*
* quietly refuse to do anything to a changed disc until the
* changed bit has been reset
*/
return 0;
}
if ((SCpnt->request.cmd == WRITE) && !scsi_CDs[dev].device->writeable)
return 0;
/*
* we do lazy blocksize switching (when reading XA sectors,
* see CDROMREADMODE2 ioctl)
*/
s_size = scsi_CDs[dev].device->sector_size;
if (s_size > 2048) {
if (!in_interrupt())
sr_set_blocklength(DEVICE_NR(CURRENT->rq_dev), 2048);
else
printk("sr: can't switch blocksize: in interrupt\n");
}
if (s_size != 512 && s_size != 1024 && s_size != 2048) {
printk("sr: bad sector size %d\n", s_size);
return 0;
}
block = SCpnt->request.sector / (s_size >> 9);
/*
* request doesn't start on hw block boundary, add scatter pads
*/
if ((SCpnt->request.sector % (s_size >> 9)) || (SCpnt->request_bufflen % s_size))
if (sr_scatter_pad(SCpnt, s_size))
return 0;
this_count = (SCpnt->request_bufflen >> 9) / (s_size >> 9);
switch (SCpnt->request.cmd) {
case WRITE:
SCpnt->cmnd[0] = WRITE_10;
SCpnt->sc_data_direction = SCSI_DATA_WRITE;
break;
case READ:
SCpnt->cmnd[0] = READ_10;
SCpnt->sc_data_direction = SCSI_DATA_READ;
break;
default:
printk("Unknown sr command %d\n", SCpnt->request.cmd);
return 0;
}
SCSI_LOG_HLQUEUE(2, printk("sr%d : %s %d/%ld 512 byte blocks.\n",
devm,
(SCpnt->request.cmd == WRITE) ? "writing" : "reading",
this_count, SCpnt->request.nr_sectors));
SCpnt->cmnd[1] = (SCpnt->device->scsi_level <= SCSI_2) ?
((SCpnt->lun << 5) & 0xe0) : 0;
if (this_count > 0xffff)
this_count = 0xffff;
SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
SCpnt->cmnd[5] = (unsigned char) block & 0xff;
SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
/*
* We shouldn't disconnect in the middle of a sector, so with a dumb
* host adapter, it's safe to assume that we can at least transfer
* this many bytes between each connect / disconnect.
*/
SCpnt->transfersize = scsi_CDs[dev].device->sector_size;
SCpnt->underflow = this_count << 9;
SCpnt->allowed = MAX_RETRIES;
SCpnt->timeout_per_command = SR_TIMEOUT;
/*
* This is the completion routine we use. This is matched in terms
* of capability to this function.
*/
SCpnt->done = rw_intr;
{
struct scatterlist *sg = SCpnt->request_buffer;
int i, size = 0;
for (i = 0; i < SCpnt->use_sg; i++)
size += sg[i].length;
if (size != SCpnt->request_bufflen && SCpnt->use_sg) {
printk("sr: mismatch count %d, bytes %d\n", size, SCpnt->request_bufflen);
SCpnt->request_bufflen = size;
}
}
/*
* This indicates that the command is ready from our end to be
* queued.
*/
return 1;
}
struct block_device_operations sr_bdops =
{
owner: THIS_MODULE,
open: cdrom_open,
release: cdrom_release,
ioctl: cdrom_ioctl,
check_media_change: cdrom_media_changed,
};
static int sr_open(struct cdrom_device_info *cdi, int purpose)
{
check_disk_change(cdi->dev);
if (MINOR(cdi->dev) >= sr_template.dev_max
|| !scsi_CDs[MINOR(cdi->dev)].device) {
return -ENXIO; /* No such device */
}
/*
* If the device is in error recovery, wait until it is done.
* If the device is offline, then disallow any access to it.
*/
if (!scsi_block_when_processing_errors(scsi_CDs[MINOR(cdi->dev)].device)) {
return -ENXIO;
}
scsi_CDs[MINOR(cdi->dev)].device->access_count++;
if (scsi_CDs[MINOR(cdi->dev)].device->host->hostt->module)
__MOD_INC_USE_COUNT(scsi_CDs[MINOR(cdi->dev)].device->host->hostt->module);
if (sr_template.module)
__MOD_INC_USE_COUNT(sr_template.module);
/* If this device did not have media in the drive at boot time, then
* we would have been unable to get the sector size. Check to see if
* this is the case, and try again.
*/
if (scsi_CDs[MINOR(cdi->dev)].needs_sector_size)
get_sectorsize(MINOR(cdi->dev));
return 0;
}
static int sr_detect(Scsi_Device * SDp)
{
if (SDp->type != TYPE_ROM && SDp->type != TYPE_WORM)
return 0;
sr_template.dev_noticed++;
return 1;
}
static int sr_attach(Scsi_Device * SDp)
{
Scsi_CD *cpnt;
int i;
if (SDp->type != TYPE_ROM && SDp->type != TYPE_WORM)
return 1;
if (sr_template.nr_dev >= sr_template.dev_max) {
SDp->attached--;
return 1;
}
for (cpnt = scsi_CDs, i = 0; i < sr_template.dev_max; i++, cpnt++)
if (!cpnt->device)
break;
if (i >= sr_template.dev_max)
panic("scsi_devices corrupt (sr)");
scsi_CDs[i].device = SDp;
sr_template.nr_dev++;
if (sr_template.nr_dev > sr_template.dev_max)
panic("scsi_devices corrupt (sr)");
printk("Attached scsi CD-ROM sr%d at scsi%d, channel %d, id %d, lun %d\n",
i, SDp->host->host_no, SDp->channel, SDp->id, SDp->lun);
return 0;
}
void get_sectorsize(int i)
{
unsigned char cmd[10];
unsigned char *buffer;
int the_result, retries;
int sector_size;
Scsi_Request *SRpnt;
buffer = (unsigned char *) scsi_malloc(512);
SRpnt = scsi_allocate_request(scsi_CDs[i].device);
if(buffer == NULL || SRpnt == NULL)
{
scsi_CDs[i].capacity = 0x1fffff;
sector_size = 2048; /* A guess, just in case */
scsi_CDs[i].needs_sector_size = 1;
if(buffer)
scsi_free(buffer, 512);
if(SRpnt)
scsi_release_request(SRpnt);
return;
}
retries = 3;
do {
cmd[0] = READ_CAPACITY;
cmd[1] = (scsi_CDs[i].device->scsi_level <= SCSI_2) ?
((scsi_CDs[i].device->lun << 5) & 0xe0) : 0;
memset((void *) &cmd[2], 0, 8);
SRpnt->sr_request.rq_status = RQ_SCSI_BUSY; /* Mark as really busy */
SRpnt->sr_cmd_len = 0;
memset(buffer, 0, 8);
/* Do the command and wait.. */
SRpnt->sr_data_direction = SCSI_DATA_READ;
scsi_wait_req(SRpnt, (void *) cmd, (void *) buffer,
8, SR_TIMEOUT, MAX_RETRIES);
the_result = SRpnt->sr_result;
retries--;
} while (the_result && retries);
scsi_release_request(SRpnt);
SRpnt = NULL;
if (the_result) {
scsi_CDs[i].capacity = 0x1fffff;
sector_size = 2048; /* A guess, just in case */
scsi_CDs[i].needs_sector_size = 1;
} else {
#if 0
if (cdrom_get_last_written(MKDEV(MAJOR_NR, i),
&scsi_CDs[i].capacity))
#endif
scsi_CDs[i].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:
scsi_CDs[i].capacity *= 4;
/* fall through */
case 512:
break;
default:
printk("sr%d: unsupported sector size %d.\n",
i, sector_size);
scsi_CDs[i].capacity = 0;
scsi_CDs[i].needs_sector_size = 1;
}
scsi_CDs[i].device->sector_size = sector_size;
/*
* Add this so that we have the ability to correctly gauge
* what the device is capable of.
*/
scsi_CDs[i].needs_sector_size = 0;
sr_sizes[i] = scsi_CDs[i].capacity >> (BLOCK_SIZE_BITS - 9);
};
scsi_free(buffer, 512);
}
void get_capabilities(int i)
{
unsigned char cmd[6];
unsigned char *buffer;
int rc, n;
static char *loadmech[] =
{
"caddy",
"tray",
"pop-up",
"",
"changer",
"cartridge changer",
"",
""
};
buffer = (unsigned char *) scsi_malloc(512);
if (!buffer)
{
printk(KERN_ERR "sr: out of memory.\n");
return;
}
cmd[0] = MODE_SENSE;
cmd[1] = (scsi_CDs[i].device->scsi_level <= SCSI_2) ?
((scsi_CDs[i].device->lun << 5) & 0xe0) : 0;
cmd[2] = 0x2a;
cmd[4] = 128;
cmd[3] = cmd[5] = 0;
rc = sr_do_ioctl(i, cmd, buffer, 128, 1, SCSI_DATA_READ, NULL);
if (rc) {
/* failed, drive doesn't have capabilities mode page */
scsi_CDs[i].cdi.speed = 1;
scsi_CDs[i].cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R |
CDC_DVD | CDC_DVD_RAM |
CDC_SELECT_DISC | CDC_SELECT_SPEED);
scsi_free(buffer, 512);
printk("sr%i: scsi-1 drive\n", i);
return;
}
n = buffer[3] + 4;
scsi_CDs[i].cdi.speed = ((buffer[n + 8] << 8) + buffer[n + 9]) / 176;
scsi_CDs[i].readcd_known = 1;
scsi_CDs[i].readcd_cdda = buffer[n + 5] & 0x01;
/* print some capability bits */
printk("sr%i: scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", i,
((buffer[n + 14] << 8) + buffer[n + 15]) / 176,
scsi_CDs[i].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... */
scsi_CDs[i].cdi.mask |= CDC_CLOSE_TRAY;
if ((buffer[n + 2] & 0x8) == 0)
/* not a DVD drive */
scsi_CDs[i].cdi.mask |= CDC_DVD;
if ((buffer[n + 3] & 0x20) == 0) {
/* can't write DVD-RAM media */
scsi_CDs[i].cdi.mask |= CDC_DVD_RAM;
} else {
scsi_CDs[i].device->writeable = 1;
}
if ((buffer[n + 3] & 0x10) == 0)
/* can't write DVD-R media */
scsi_CDs[i].cdi.mask |= CDC_DVD_R;
if ((buffer[n + 3] & 0x2) == 0)
/* can't write CD-RW media */
scsi_CDs[i].cdi.mask |= CDC_CD_RW;
if ((buffer[n + 3] & 0x1) == 0)
/* can't write CD-R media */
scsi_CDs[i].cdi.mask |= CDC_CD_R;
if ((buffer[n + 6] & 0x8) == 0)
/* can't eject */
scsi_CDs[i].cdi.mask |= CDC_OPEN_TRAY;
if ((buffer[n + 6] >> 5) == mechtype_individual_changer ||
(buffer[n + 6] >> 5) == mechtype_cartridge_changer)
scsi_CDs[i].cdi.capacity =
cdrom_number_of_slots(&(scsi_CDs[i].cdi));
if (scsi_CDs[i].cdi.capacity <= 1)
/* not a changer */
scsi_CDs[i].cdi.mask |= CDC_SELECT_DISC;
/*else I don't think it can close its tray
scsi_CDs[i].cdi.mask |= CDC_CLOSE_TRAY; */
scsi_free(buffer, 512);
}
/*
* 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 cdrom_generic_command *cgc)
{
Scsi_Device *device = scsi_CDs[MINOR(cdi->dev)].device;
/* set the LUN */
if (device->scsi_level <= SCSI_2)
cgc->cmd[1] |= device->lun << 5;
cgc->stat = sr_do_ioctl(MINOR(cdi->dev), cgc->cmd, cgc->buffer, cgc->buflen, cgc->quiet, cgc->data_direction, cgc->sense);
return cgc->stat;
}
static int sr_registered;
static int sr_init()
{
int i;
if (sr_template.dev_noticed == 0)
return 0;
if (!sr_registered) {
if (devfs_register_blkdev(MAJOR_NR, "sr", &sr_bdops)) {
printk("Unable to get major %d for SCSI-CD\n", MAJOR_NR);
sr_template.dev_noticed = 0;
return 1;
}
sr_registered++;
}
if (scsi_CDs)
return 0;
sr_template.dev_max = sr_template.dev_noticed + SR_EXTRA_DEVS;
scsi_CDs = kmalloc(sr_template.dev_max * sizeof(Scsi_CD), GFP_ATOMIC);
if (!scsi_CDs)
goto cleanup_devfs;
memset(scsi_CDs, 0, sr_template.dev_max * sizeof(Scsi_CD));
sr_sizes = kmalloc(sr_template.dev_max * sizeof(int), GFP_ATOMIC);
if (!sr_sizes)
goto cleanup_cds;
memset(sr_sizes, 0, sr_template.dev_max * sizeof(int));
sr_blocksizes = kmalloc(sr_template.dev_max * sizeof(int), GFP_ATOMIC);
if (!sr_blocksizes)
goto cleanup_sizes;
sr_hardsizes = kmalloc(sr_template.dev_max * sizeof(int), GFP_ATOMIC);
if (!sr_hardsizes)
goto cleanup_blocksizes;
/*
* These are good guesses for the time being.
*/
for (i = 0; i < sr_template.dev_max; i++) {
sr_blocksizes[i] = 2048;
sr_hardsizes[i] = 2048;
}
blksize_size[MAJOR_NR] = sr_blocksizes;
hardsect_size[MAJOR_NR] = sr_hardsizes;
return 0;
cleanup_blocksizes:
kfree(sr_blocksizes);
cleanup_sizes:
kfree(sr_sizes);
cleanup_cds:
kfree(scsi_CDs);
scsi_CDs = NULL;
cleanup_devfs:
devfs_unregister_blkdev(MAJOR_NR, "sr");
sr_template.dev_noticed = 0;
sr_registered--;
return 1;
}
void sr_finish()
{
int i;
char name[6];
blk_dev[MAJOR_NR].queue = sr_find_queue;
blk_size[MAJOR_NR] = sr_sizes;
for (i = 0; i < sr_template.nr_dev; ++i) {
/* If we have already seen this, then skip it. Comes up
* with loadable modules. */
if (scsi_CDs[i].capacity)
continue;
scsi_CDs[i].capacity = 0x1fffff;
scsi_CDs[i].device->sector_size = 2048; /* A guess, just in case */
scsi_CDs[i].needs_sector_size = 1;
scsi_CDs[i].device->changed = 1; /* force recheck CD type */
#if 0
/* seems better to leave this for later */
get_sectorsize(i);
printk("Scd sectorsize = %d bytes.\n", scsi_CDs[i].sector_size);
#endif
scsi_CDs[i].use = 1;
scsi_CDs[i].device->ten = 1;
scsi_CDs[i].device->remap = 1;
scsi_CDs[i].readcd_known = 0;
scsi_CDs[i].readcd_cdda = 0;
sr_sizes[i] = scsi_CDs[i].capacity >> (BLOCK_SIZE_BITS - 9);
scsi_CDs[i].cdi.ops = &sr_dops;
scsi_CDs[i].cdi.handle = &scsi_CDs[i];
scsi_CDs[i].cdi.dev = MKDEV(MAJOR_NR, i);
scsi_CDs[i].cdi.mask = 0;
scsi_CDs[i].cdi.capacity = 1;
/*
* FIXME: someone needs to handle a get_capabilities
* failure properly ??
*/
get_capabilities(i);
sr_vendor_init(i);
sprintf(name, "sr%d", i);
strcpy(scsi_CDs[i].cdi.name, name);
scsi_CDs[i].cdi.de =
devfs_register (scsi_CDs[i].device->de, "cd",
DEVFS_FL_DEFAULT, MAJOR_NR, i,
S_IFBLK | S_IRUGO | S_IWUGO,
&sr_bdops, NULL);
register_cdrom(&scsi_CDs[i].cdi);
}
/* If our host adapter is capable of scatter-gather, then we increase
* the read-ahead to 16 blocks (32 sectors). If not, we use
* a two block (4 sector) read ahead. */
if (scsi_CDs[0].device && scsi_CDs[0].device->host->sg_tablesize)
read_ahead[MAJOR_NR] = 32; /* 32 sector read-ahead. Always removable. */
else
read_ahead[MAJOR_NR] = 4; /* 4 sector read-ahead */
return;
}
static void sr_detach(Scsi_Device * SDp)
{
Scsi_CD *cpnt;
int i;
if (scsi_CDs == NULL)
return;
for (cpnt = scsi_CDs, i = 0; i < sr_template.dev_max; i++, cpnt++)
if (cpnt->device == SDp) {
/*
* Since the cdrom is read-only, no need to sync the device.
* We should be kind to our buffer cache, however.
*/
invalidate_device(MKDEV(MAJOR_NR, i), 0);
/*
* Reset things back to a sane state so that one can re-load a new
* driver (perhaps the same one).
*/
unregister_cdrom(&(cpnt->cdi));
cpnt->device = NULL;
cpnt->capacity = 0;
SDp->attached--;
sr_template.nr_dev--;
sr_template.dev_noticed--;
sr_sizes[i] = 0;
return;
}
return;
}
static int __init init_sr(void)
{
sr_template.module = THIS_MODULE;
return scsi_register_module(MODULE_SCSI_DEV, &sr_template);
}
static void __exit exit_sr(void)
{
scsi_unregister_module(MODULE_SCSI_DEV, &sr_template);
devfs_unregister_blkdev(MAJOR_NR, "sr");
sr_registered--;
if (scsi_CDs != NULL) {
kfree(scsi_CDs);
kfree(sr_sizes);
sr_sizes = NULL;
kfree(sr_blocksizes);
sr_blocksizes = NULL;
kfree(sr_hardsizes);
sr_hardsizes = NULL;
}
blksize_size[MAJOR_NR] = NULL;
hardsect_size[MAJOR_NR] = NULL;
blk_size[MAJOR_NR] = NULL;
read_ahead[MAJOR_NR] = 0;
sr_template.dev_max = 0;
}
module_init(init_sr);
module_exit(exit_sr);
MODULE_LICENSE("GPL");
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