mirror of
https://github.com/torvalds/linux.git
synced 2024-11-16 00:52:01 +00:00
c65be1a63f
When evaluating a SCSI command's result using the field access macros, check for equality of the fields and not if a specific bit is set. This is a preparation patch, for reworking the results field in the SCSI command. Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Bart Van Assche <bart.vanassche@wdc.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
1048 lines
25 KiB
C
1048 lines
25 KiB
C
/*
|
|
* SCSI Media Changer device driver for Linux 2.6
|
|
*
|
|
* (c) 1996-2003 Gerd Knorr <kraxel@bytesex.org>
|
|
*
|
|
*/
|
|
|
|
#define VERSION "0.25"
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/major.h>
|
|
#include <linux/string.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/blkdev.h>
|
|
#include <linux/completion.h>
|
|
#include <linux/compat.h>
|
|
#include <linux/chio.h> /* here are all the ioctls */
|
|
#include <linux/mutex.h>
|
|
#include <linux/idr.h>
|
|
#include <linux/slab.h>
|
|
|
|
#include <scsi/scsi.h>
|
|
#include <scsi/scsi_cmnd.h>
|
|
#include <scsi/scsi_driver.h>
|
|
#include <scsi/scsi_ioctl.h>
|
|
#include <scsi/scsi_host.h>
|
|
#include <scsi/scsi_device.h>
|
|
#include <scsi/scsi_eh.h>
|
|
#include <scsi/scsi_dbg.h>
|
|
|
|
#define CH_DT_MAX 16
|
|
#define CH_TYPES 8
|
|
#define CH_MAX_DEVS 128
|
|
|
|
MODULE_DESCRIPTION("device driver for scsi media changer devices");
|
|
MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org>");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS_CHARDEV_MAJOR(SCSI_CHANGER_MAJOR);
|
|
MODULE_ALIAS_SCSI_DEVICE(TYPE_MEDIUM_CHANGER);
|
|
|
|
static DEFINE_MUTEX(ch_mutex);
|
|
static int init = 1;
|
|
module_param(init, int, 0444);
|
|
MODULE_PARM_DESC(init, \
|
|
"initialize element status on driver load (default: on)");
|
|
|
|
static int timeout_move = 300;
|
|
module_param(timeout_move, int, 0644);
|
|
MODULE_PARM_DESC(timeout_move,"timeout for move commands "
|
|
"(default: 300 seconds)");
|
|
|
|
static int timeout_init = 3600;
|
|
module_param(timeout_init, int, 0644);
|
|
MODULE_PARM_DESC(timeout_init,"timeout for INITIALIZE ELEMENT STATUS "
|
|
"(default: 3600 seconds)");
|
|
|
|
static int verbose = 1;
|
|
module_param(verbose, int, 0644);
|
|
MODULE_PARM_DESC(verbose,"be verbose (default: on)");
|
|
|
|
static int debug = 0;
|
|
module_param(debug, int, 0644);
|
|
MODULE_PARM_DESC(debug,"enable/disable debug messages, also prints more "
|
|
"detailed sense codes on scsi errors (default: off)");
|
|
|
|
static int dt_id[CH_DT_MAX] = { [ 0 ... (CH_DT_MAX-1) ] = -1 };
|
|
static int dt_lun[CH_DT_MAX];
|
|
module_param_array(dt_id, int, NULL, 0444);
|
|
module_param_array(dt_lun, int, NULL, 0444);
|
|
|
|
/* tell the driver about vendor-specific slots */
|
|
static int vendor_firsts[CH_TYPES-4];
|
|
static int vendor_counts[CH_TYPES-4];
|
|
module_param_array(vendor_firsts, int, NULL, 0444);
|
|
module_param_array(vendor_counts, int, NULL, 0444);
|
|
|
|
static const char * vendor_labels[CH_TYPES-4] = {
|
|
"v0", "v1", "v2", "v3"
|
|
};
|
|
// module_param_string_array(vendor_labels, NULL, 0444);
|
|
|
|
#define ch_printk(prefix, ch, fmt, a...) \
|
|
sdev_prefix_printk(prefix, (ch)->device, (ch)->name, fmt, ##a)
|
|
|
|
#define DPRINTK(fmt, arg...) \
|
|
do { \
|
|
if (debug) \
|
|
ch_printk(KERN_DEBUG, ch, fmt, ##arg); \
|
|
} while (0)
|
|
#define VPRINTK(level, fmt, arg...) \
|
|
do { \
|
|
if (verbose) \
|
|
ch_printk(level, ch, fmt, ##arg); \
|
|
} while (0)
|
|
|
|
/* ------------------------------------------------------------------- */
|
|
|
|
#define MAX_RETRIES 1
|
|
|
|
static struct class * ch_sysfs_class;
|
|
|
|
typedef struct {
|
|
struct kref ref;
|
|
struct list_head list;
|
|
int minor;
|
|
char name[8];
|
|
struct scsi_device *device;
|
|
struct scsi_device **dt; /* ptrs to data transfer elements */
|
|
u_int firsts[CH_TYPES];
|
|
u_int counts[CH_TYPES];
|
|
u_int unit_attention;
|
|
u_int voltags;
|
|
struct mutex lock;
|
|
} scsi_changer;
|
|
|
|
static DEFINE_IDR(ch_index_idr);
|
|
static DEFINE_SPINLOCK(ch_index_lock);
|
|
|
|
static const struct {
|
|
unsigned char sense;
|
|
unsigned char asc;
|
|
unsigned char ascq;
|
|
int errno;
|
|
} ch_err[] = {
|
|
/* Just filled in what looks right. Hav'nt checked any standard paper for
|
|
these errno assignments, so they may be wrong... */
|
|
{
|
|
.sense = ILLEGAL_REQUEST,
|
|
.asc = 0x21,
|
|
.ascq = 0x01,
|
|
.errno = EBADSLT, /* Invalid element address */
|
|
},{
|
|
.sense = ILLEGAL_REQUEST,
|
|
.asc = 0x28,
|
|
.ascq = 0x01,
|
|
.errno = EBADE, /* Import or export element accessed */
|
|
},{
|
|
.sense = ILLEGAL_REQUEST,
|
|
.asc = 0x3B,
|
|
.ascq = 0x0D,
|
|
.errno = EXFULL, /* Medium destination element full */
|
|
},{
|
|
.sense = ILLEGAL_REQUEST,
|
|
.asc = 0x3B,
|
|
.ascq = 0x0E,
|
|
.errno = EBADE, /* Medium source element empty */
|
|
},{
|
|
.sense = ILLEGAL_REQUEST,
|
|
.asc = 0x20,
|
|
.ascq = 0x00,
|
|
.errno = EBADRQC, /* Invalid command operation code */
|
|
},{
|
|
/* end of list */
|
|
}
|
|
};
|
|
|
|
/* ------------------------------------------------------------------- */
|
|
|
|
static int ch_find_errno(struct scsi_sense_hdr *sshdr)
|
|
{
|
|
int i,errno = 0;
|
|
|
|
/* Check to see if additional sense information is available */
|
|
if (scsi_sense_valid(sshdr) &&
|
|
sshdr->asc != 0) {
|
|
for (i = 0; ch_err[i].errno != 0; i++) {
|
|
if (ch_err[i].sense == sshdr->sense_key &&
|
|
ch_err[i].asc == sshdr->asc &&
|
|
ch_err[i].ascq == sshdr->ascq) {
|
|
errno = -ch_err[i].errno;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
if (errno == 0)
|
|
errno = -EIO;
|
|
return errno;
|
|
}
|
|
|
|
static int
|
|
ch_do_scsi(scsi_changer *ch, unsigned char *cmd, int cmd_len,
|
|
void *buffer, unsigned buflength,
|
|
enum dma_data_direction direction)
|
|
{
|
|
int errno, retries = 0, timeout, result;
|
|
struct scsi_sense_hdr sshdr;
|
|
|
|
timeout = (cmd[0] == INITIALIZE_ELEMENT_STATUS)
|
|
? timeout_init : timeout_move;
|
|
|
|
retry:
|
|
errno = 0;
|
|
result = scsi_execute_req(ch->device, cmd, direction, buffer,
|
|
buflength, &sshdr, timeout * HZ,
|
|
MAX_RETRIES, NULL);
|
|
|
|
if (driver_byte(result) == DRIVER_SENSE) {
|
|
if (debug)
|
|
scsi_print_sense_hdr(ch->device, ch->name, &sshdr);
|
|
errno = ch_find_errno(&sshdr);
|
|
|
|
switch(sshdr.sense_key) {
|
|
case UNIT_ATTENTION:
|
|
ch->unit_attention = 1;
|
|
if (retries++ < 3)
|
|
goto retry;
|
|
break;
|
|
}
|
|
}
|
|
return errno;
|
|
}
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
|
|
static int
|
|
ch_elem_to_typecode(scsi_changer *ch, u_int elem)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < CH_TYPES; i++) {
|
|
if (elem >= ch->firsts[i] &&
|
|
elem < ch->firsts[i] +
|
|
ch->counts[i])
|
|
return i+1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
ch_read_element_status(scsi_changer *ch, u_int elem, char *data)
|
|
{
|
|
u_char cmd[12];
|
|
u_char *buffer;
|
|
int result;
|
|
|
|
buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
|
|
if(!buffer)
|
|
return -ENOMEM;
|
|
|
|
retry:
|
|
memset(cmd,0,sizeof(cmd));
|
|
cmd[0] = READ_ELEMENT_STATUS;
|
|
cmd[1] = ((ch->device->lun & 0x7) << 5) |
|
|
(ch->voltags ? 0x10 : 0) |
|
|
ch_elem_to_typecode(ch,elem);
|
|
cmd[2] = (elem >> 8) & 0xff;
|
|
cmd[3] = elem & 0xff;
|
|
cmd[5] = 1;
|
|
cmd[9] = 255;
|
|
if (0 == (result = ch_do_scsi(ch, cmd, 12,
|
|
buffer, 256, DMA_FROM_DEVICE))) {
|
|
if (((buffer[16] << 8) | buffer[17]) != elem) {
|
|
DPRINTK("asked for element 0x%02x, got 0x%02x\n",
|
|
elem,(buffer[16] << 8) | buffer[17]);
|
|
kfree(buffer);
|
|
return -EIO;
|
|
}
|
|
memcpy(data,buffer+16,16);
|
|
} else {
|
|
if (ch->voltags) {
|
|
ch->voltags = 0;
|
|
VPRINTK(KERN_INFO, "device has no volume tag support\n");
|
|
goto retry;
|
|
}
|
|
DPRINTK("READ ELEMENT STATUS for element 0x%x failed\n",elem);
|
|
}
|
|
kfree(buffer);
|
|
return result;
|
|
}
|
|
|
|
static int
|
|
ch_init_elem(scsi_changer *ch)
|
|
{
|
|
int err;
|
|
u_char cmd[6];
|
|
|
|
VPRINTK(KERN_INFO, "INITIALIZE ELEMENT STATUS, may take some time ...\n");
|
|
memset(cmd,0,sizeof(cmd));
|
|
cmd[0] = INITIALIZE_ELEMENT_STATUS;
|
|
cmd[1] = (ch->device->lun & 0x7) << 5;
|
|
err = ch_do_scsi(ch, cmd, 6, NULL, 0, DMA_NONE);
|
|
VPRINTK(KERN_INFO, "... finished\n");
|
|
return err;
|
|
}
|
|
|
|
static int
|
|
ch_readconfig(scsi_changer *ch)
|
|
{
|
|
u_char cmd[10], data[16];
|
|
u_char *buffer;
|
|
int result,id,lun,i;
|
|
u_int elem;
|
|
|
|
buffer = kzalloc(512, GFP_KERNEL | GFP_DMA);
|
|
if (!buffer)
|
|
return -ENOMEM;
|
|
|
|
memset(cmd,0,sizeof(cmd));
|
|
cmd[0] = MODE_SENSE;
|
|
cmd[1] = (ch->device->lun & 0x7) << 5;
|
|
cmd[2] = 0x1d;
|
|
cmd[4] = 255;
|
|
result = ch_do_scsi(ch, cmd, 10, buffer, 255, DMA_FROM_DEVICE);
|
|
if (0 != result) {
|
|
cmd[1] |= (1<<3);
|
|
result = ch_do_scsi(ch, cmd, 10, buffer, 255, DMA_FROM_DEVICE);
|
|
}
|
|
if (0 == result) {
|
|
ch->firsts[CHET_MT] =
|
|
(buffer[buffer[3]+ 6] << 8) | buffer[buffer[3]+ 7];
|
|
ch->counts[CHET_MT] =
|
|
(buffer[buffer[3]+ 8] << 8) | buffer[buffer[3]+ 9];
|
|
ch->firsts[CHET_ST] =
|
|
(buffer[buffer[3]+10] << 8) | buffer[buffer[3]+11];
|
|
ch->counts[CHET_ST] =
|
|
(buffer[buffer[3]+12] << 8) | buffer[buffer[3]+13];
|
|
ch->firsts[CHET_IE] =
|
|
(buffer[buffer[3]+14] << 8) | buffer[buffer[3]+15];
|
|
ch->counts[CHET_IE] =
|
|
(buffer[buffer[3]+16] << 8) | buffer[buffer[3]+17];
|
|
ch->firsts[CHET_DT] =
|
|
(buffer[buffer[3]+18] << 8) | buffer[buffer[3]+19];
|
|
ch->counts[CHET_DT] =
|
|
(buffer[buffer[3]+20] << 8) | buffer[buffer[3]+21];
|
|
VPRINTK(KERN_INFO, "type #1 (mt): 0x%x+%d [medium transport]\n",
|
|
ch->firsts[CHET_MT],
|
|
ch->counts[CHET_MT]);
|
|
VPRINTK(KERN_INFO, "type #2 (st): 0x%x+%d [storage]\n",
|
|
ch->firsts[CHET_ST],
|
|
ch->counts[CHET_ST]);
|
|
VPRINTK(KERN_INFO, "type #3 (ie): 0x%x+%d [import/export]\n",
|
|
ch->firsts[CHET_IE],
|
|
ch->counts[CHET_IE]);
|
|
VPRINTK(KERN_INFO, "type #4 (dt): 0x%x+%d [data transfer]\n",
|
|
ch->firsts[CHET_DT],
|
|
ch->counts[CHET_DT]);
|
|
} else {
|
|
VPRINTK(KERN_INFO, "reading element address assignment page failed!\n");
|
|
}
|
|
|
|
/* vendor specific element types */
|
|
for (i = 0; i < 4; i++) {
|
|
if (0 == vendor_counts[i])
|
|
continue;
|
|
if (NULL == vendor_labels[i])
|
|
continue;
|
|
ch->firsts[CHET_V1+i] = vendor_firsts[i];
|
|
ch->counts[CHET_V1+i] = vendor_counts[i];
|
|
VPRINTK(KERN_INFO, "type #%d (v%d): 0x%x+%d [%s, vendor specific]\n",
|
|
i+5,i+1,vendor_firsts[i],vendor_counts[i],
|
|
vendor_labels[i]);
|
|
}
|
|
|
|
/* look up the devices of the data transfer elements */
|
|
ch->dt = kcalloc(ch->counts[CHET_DT], sizeof(*ch->dt),
|
|
GFP_KERNEL);
|
|
|
|
if (!ch->dt) {
|
|
kfree(buffer);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
for (elem = 0; elem < ch->counts[CHET_DT]; elem++) {
|
|
id = -1;
|
|
lun = 0;
|
|
if (elem < CH_DT_MAX && -1 != dt_id[elem]) {
|
|
id = dt_id[elem];
|
|
lun = dt_lun[elem];
|
|
VPRINTK(KERN_INFO, "dt 0x%x: [insmod option] ",
|
|
elem+ch->firsts[CHET_DT]);
|
|
} else if (0 != ch_read_element_status
|
|
(ch,elem+ch->firsts[CHET_DT],data)) {
|
|
VPRINTK(KERN_INFO, "dt 0x%x: READ ELEMENT STATUS failed\n",
|
|
elem+ch->firsts[CHET_DT]);
|
|
} else {
|
|
VPRINTK(KERN_INFO, "dt 0x%x: ",elem+ch->firsts[CHET_DT]);
|
|
if (data[6] & 0x80) {
|
|
VPRINTK(KERN_CONT, "not this SCSI bus\n");
|
|
ch->dt[elem] = NULL;
|
|
} else if (0 == (data[6] & 0x30)) {
|
|
VPRINTK(KERN_CONT, "ID/LUN unknown\n");
|
|
ch->dt[elem] = NULL;
|
|
} else {
|
|
id = ch->device->id;
|
|
lun = 0;
|
|
if (data[6] & 0x20) id = data[7];
|
|
if (data[6] & 0x10) lun = data[6] & 7;
|
|
}
|
|
}
|
|
if (-1 != id) {
|
|
VPRINTK(KERN_CONT, "ID %i, LUN %i, ",id,lun);
|
|
ch->dt[elem] =
|
|
scsi_device_lookup(ch->device->host,
|
|
ch->device->channel,
|
|
id,lun);
|
|
if (!ch->dt[elem]) {
|
|
/* should not happen */
|
|
VPRINTK(KERN_CONT, "Huh? device not found!\n");
|
|
} else {
|
|
VPRINTK(KERN_CONT, "name: %8.8s %16.16s %4.4s\n",
|
|
ch->dt[elem]->vendor,
|
|
ch->dt[elem]->model,
|
|
ch->dt[elem]->rev);
|
|
}
|
|
}
|
|
}
|
|
ch->voltags = 1;
|
|
kfree(buffer);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
|
|
static int
|
|
ch_position(scsi_changer *ch, u_int trans, u_int elem, int rotate)
|
|
{
|
|
u_char cmd[10];
|
|
|
|
DPRINTK("position: 0x%x\n",elem);
|
|
if (0 == trans)
|
|
trans = ch->firsts[CHET_MT];
|
|
memset(cmd,0,sizeof(cmd));
|
|
cmd[0] = POSITION_TO_ELEMENT;
|
|
cmd[1] = (ch->device->lun & 0x7) << 5;
|
|
cmd[2] = (trans >> 8) & 0xff;
|
|
cmd[3] = trans & 0xff;
|
|
cmd[4] = (elem >> 8) & 0xff;
|
|
cmd[5] = elem & 0xff;
|
|
cmd[8] = rotate ? 1 : 0;
|
|
return ch_do_scsi(ch, cmd, 10, NULL, 0, DMA_NONE);
|
|
}
|
|
|
|
static int
|
|
ch_move(scsi_changer *ch, u_int trans, u_int src, u_int dest, int rotate)
|
|
{
|
|
u_char cmd[12];
|
|
|
|
DPRINTK("move: 0x%x => 0x%x\n",src,dest);
|
|
if (0 == trans)
|
|
trans = ch->firsts[CHET_MT];
|
|
memset(cmd,0,sizeof(cmd));
|
|
cmd[0] = MOVE_MEDIUM;
|
|
cmd[1] = (ch->device->lun & 0x7) << 5;
|
|
cmd[2] = (trans >> 8) & 0xff;
|
|
cmd[3] = trans & 0xff;
|
|
cmd[4] = (src >> 8) & 0xff;
|
|
cmd[5] = src & 0xff;
|
|
cmd[6] = (dest >> 8) & 0xff;
|
|
cmd[7] = dest & 0xff;
|
|
cmd[10] = rotate ? 1 : 0;
|
|
return ch_do_scsi(ch, cmd, 12, NULL,0, DMA_NONE);
|
|
}
|
|
|
|
static int
|
|
ch_exchange(scsi_changer *ch, u_int trans, u_int src,
|
|
u_int dest1, u_int dest2, int rotate1, int rotate2)
|
|
{
|
|
u_char cmd[12];
|
|
|
|
DPRINTK("exchange: 0x%x => 0x%x => 0x%x\n",
|
|
src,dest1,dest2);
|
|
if (0 == trans)
|
|
trans = ch->firsts[CHET_MT];
|
|
memset(cmd,0,sizeof(cmd));
|
|
cmd[0] = EXCHANGE_MEDIUM;
|
|
cmd[1] = (ch->device->lun & 0x7) << 5;
|
|
cmd[2] = (trans >> 8) & 0xff;
|
|
cmd[3] = trans & 0xff;
|
|
cmd[4] = (src >> 8) & 0xff;
|
|
cmd[5] = src & 0xff;
|
|
cmd[6] = (dest1 >> 8) & 0xff;
|
|
cmd[7] = dest1 & 0xff;
|
|
cmd[8] = (dest2 >> 8) & 0xff;
|
|
cmd[9] = dest2 & 0xff;
|
|
cmd[10] = (rotate1 ? 1 : 0) | (rotate2 ? 2 : 0);
|
|
|
|
return ch_do_scsi(ch, cmd, 12, NULL, 0, DMA_NONE);
|
|
}
|
|
|
|
static void
|
|
ch_check_voltag(char *tag)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < 32; i++) {
|
|
/* restrict to ascii */
|
|
if (tag[i] >= 0x7f || tag[i] < 0x20)
|
|
tag[i] = ' ';
|
|
/* don't allow search wildcards */
|
|
if (tag[i] == '?' ||
|
|
tag[i] == '*')
|
|
tag[i] = ' ';
|
|
}
|
|
}
|
|
|
|
static int
|
|
ch_set_voltag(scsi_changer *ch, u_int elem,
|
|
int alternate, int clear, u_char *tag)
|
|
{
|
|
u_char cmd[12];
|
|
u_char *buffer;
|
|
int result;
|
|
|
|
buffer = kzalloc(512, GFP_KERNEL);
|
|
if (!buffer)
|
|
return -ENOMEM;
|
|
|
|
DPRINTK("%s %s voltag: 0x%x => \"%s\"\n",
|
|
clear ? "clear" : "set",
|
|
alternate ? "alternate" : "primary",
|
|
elem, tag);
|
|
memset(cmd,0,sizeof(cmd));
|
|
cmd[0] = SEND_VOLUME_TAG;
|
|
cmd[1] = ((ch->device->lun & 0x7) << 5) |
|
|
ch_elem_to_typecode(ch,elem);
|
|
cmd[2] = (elem >> 8) & 0xff;
|
|
cmd[3] = elem & 0xff;
|
|
cmd[5] = clear
|
|
? (alternate ? 0x0d : 0x0c)
|
|
: (alternate ? 0x0b : 0x0a);
|
|
|
|
cmd[9] = 255;
|
|
|
|
memcpy(buffer,tag,32);
|
|
ch_check_voltag(buffer);
|
|
|
|
result = ch_do_scsi(ch, cmd, 12, buffer, 256, DMA_TO_DEVICE);
|
|
kfree(buffer);
|
|
return result;
|
|
}
|
|
|
|
static int ch_gstatus(scsi_changer *ch, int type, unsigned char __user *dest)
|
|
{
|
|
int retval = 0;
|
|
u_char data[16];
|
|
unsigned int i;
|
|
|
|
mutex_lock(&ch->lock);
|
|
for (i = 0; i < ch->counts[type]; i++) {
|
|
if (0 != ch_read_element_status
|
|
(ch, ch->firsts[type]+i,data)) {
|
|
retval = -EIO;
|
|
break;
|
|
}
|
|
put_user(data[2], dest+i);
|
|
if (data[2] & CESTATUS_EXCEPT)
|
|
VPRINTK(KERN_INFO, "element 0x%x: asc=0x%x, ascq=0x%x\n",
|
|
ch->firsts[type]+i,
|
|
(int)data[4],(int)data[5]);
|
|
retval = ch_read_element_status
|
|
(ch, ch->firsts[type]+i,data);
|
|
if (0 != retval)
|
|
break;
|
|
}
|
|
mutex_unlock(&ch->lock);
|
|
return retval;
|
|
}
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
|
|
static void ch_destroy(struct kref *ref)
|
|
{
|
|
scsi_changer *ch = container_of(ref, scsi_changer, ref);
|
|
|
|
kfree(ch->dt);
|
|
kfree(ch);
|
|
}
|
|
|
|
static int
|
|
ch_release(struct inode *inode, struct file *file)
|
|
{
|
|
scsi_changer *ch = file->private_data;
|
|
|
|
scsi_device_put(ch->device);
|
|
ch->device = NULL;
|
|
file->private_data = NULL;
|
|
kref_put(&ch->ref, ch_destroy);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
ch_open(struct inode *inode, struct file *file)
|
|
{
|
|
scsi_changer *ch;
|
|
int minor = iminor(inode);
|
|
|
|
mutex_lock(&ch_mutex);
|
|
spin_lock(&ch_index_lock);
|
|
ch = idr_find(&ch_index_idr, minor);
|
|
|
|
if (NULL == ch || scsi_device_get(ch->device)) {
|
|
spin_unlock(&ch_index_lock);
|
|
mutex_unlock(&ch_mutex);
|
|
return -ENXIO;
|
|
}
|
|
kref_get(&ch->ref);
|
|
spin_unlock(&ch_index_lock);
|
|
|
|
file->private_data = ch;
|
|
mutex_unlock(&ch_mutex);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
ch_checkrange(scsi_changer *ch, unsigned int type, unsigned int unit)
|
|
{
|
|
if (type >= CH_TYPES || unit >= ch->counts[type])
|
|
return -1;
|
|
return 0;
|
|
}
|
|
|
|
static long ch_ioctl(struct file *file,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
scsi_changer *ch = file->private_data;
|
|
int retval;
|
|
void __user *argp = (void __user *)arg;
|
|
|
|
retval = scsi_ioctl_block_when_processing_errors(ch->device, cmd,
|
|
file->f_flags & O_NDELAY);
|
|
if (retval)
|
|
return retval;
|
|
|
|
switch (cmd) {
|
|
case CHIOGPARAMS:
|
|
{
|
|
struct changer_params params;
|
|
|
|
params.cp_curpicker = 0;
|
|
params.cp_npickers = ch->counts[CHET_MT];
|
|
params.cp_nslots = ch->counts[CHET_ST];
|
|
params.cp_nportals = ch->counts[CHET_IE];
|
|
params.cp_ndrives = ch->counts[CHET_DT];
|
|
|
|
if (copy_to_user(argp, ¶ms, sizeof(params)))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
case CHIOGVPARAMS:
|
|
{
|
|
struct changer_vendor_params vparams;
|
|
|
|
memset(&vparams,0,sizeof(vparams));
|
|
if (ch->counts[CHET_V1]) {
|
|
vparams.cvp_n1 = ch->counts[CHET_V1];
|
|
strncpy(vparams.cvp_label1,vendor_labels[0],16);
|
|
}
|
|
if (ch->counts[CHET_V2]) {
|
|
vparams.cvp_n2 = ch->counts[CHET_V2];
|
|
strncpy(vparams.cvp_label2,vendor_labels[1],16);
|
|
}
|
|
if (ch->counts[CHET_V3]) {
|
|
vparams.cvp_n3 = ch->counts[CHET_V3];
|
|
strncpy(vparams.cvp_label3,vendor_labels[2],16);
|
|
}
|
|
if (ch->counts[CHET_V4]) {
|
|
vparams.cvp_n4 = ch->counts[CHET_V4];
|
|
strncpy(vparams.cvp_label4,vendor_labels[3],16);
|
|
}
|
|
if (copy_to_user(argp, &vparams, sizeof(vparams)))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
|
|
case CHIOPOSITION:
|
|
{
|
|
struct changer_position pos;
|
|
|
|
if (copy_from_user(&pos, argp, sizeof (pos)))
|
|
return -EFAULT;
|
|
|
|
if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) {
|
|
DPRINTK("CHIOPOSITION: invalid parameter\n");
|
|
return -EBADSLT;
|
|
}
|
|
mutex_lock(&ch->lock);
|
|
retval = ch_position(ch,0,
|
|
ch->firsts[pos.cp_type] + pos.cp_unit,
|
|
pos.cp_flags & CP_INVERT);
|
|
mutex_unlock(&ch->lock);
|
|
return retval;
|
|
}
|
|
|
|
case CHIOMOVE:
|
|
{
|
|
struct changer_move mv;
|
|
|
|
if (copy_from_user(&mv, argp, sizeof (mv)))
|
|
return -EFAULT;
|
|
|
|
if (0 != ch_checkrange(ch, mv.cm_fromtype, mv.cm_fromunit) ||
|
|
0 != ch_checkrange(ch, mv.cm_totype, mv.cm_tounit )) {
|
|
DPRINTK("CHIOMOVE: invalid parameter\n");
|
|
return -EBADSLT;
|
|
}
|
|
|
|
mutex_lock(&ch->lock);
|
|
retval = ch_move(ch,0,
|
|
ch->firsts[mv.cm_fromtype] + mv.cm_fromunit,
|
|
ch->firsts[mv.cm_totype] + mv.cm_tounit,
|
|
mv.cm_flags & CM_INVERT);
|
|
mutex_unlock(&ch->lock);
|
|
return retval;
|
|
}
|
|
|
|
case CHIOEXCHANGE:
|
|
{
|
|
struct changer_exchange mv;
|
|
|
|
if (copy_from_user(&mv, argp, sizeof (mv)))
|
|
return -EFAULT;
|
|
|
|
if (0 != ch_checkrange(ch, mv.ce_srctype, mv.ce_srcunit ) ||
|
|
0 != ch_checkrange(ch, mv.ce_fdsttype, mv.ce_fdstunit) ||
|
|
0 != ch_checkrange(ch, mv.ce_sdsttype, mv.ce_sdstunit)) {
|
|
DPRINTK("CHIOEXCHANGE: invalid parameter\n");
|
|
return -EBADSLT;
|
|
}
|
|
|
|
mutex_lock(&ch->lock);
|
|
retval = ch_exchange
|
|
(ch,0,
|
|
ch->firsts[mv.ce_srctype] + mv.ce_srcunit,
|
|
ch->firsts[mv.ce_fdsttype] + mv.ce_fdstunit,
|
|
ch->firsts[mv.ce_sdsttype] + mv.ce_sdstunit,
|
|
mv.ce_flags & CE_INVERT1, mv.ce_flags & CE_INVERT2);
|
|
mutex_unlock(&ch->lock);
|
|
return retval;
|
|
}
|
|
|
|
case CHIOGSTATUS:
|
|
{
|
|
struct changer_element_status ces;
|
|
|
|
if (copy_from_user(&ces, argp, sizeof (ces)))
|
|
return -EFAULT;
|
|
if (ces.ces_type < 0 || ces.ces_type >= CH_TYPES)
|
|
return -EINVAL;
|
|
|
|
return ch_gstatus(ch, ces.ces_type, ces.ces_data);
|
|
}
|
|
|
|
case CHIOGELEM:
|
|
{
|
|
struct changer_get_element cge;
|
|
u_char ch_cmd[12];
|
|
u_char *buffer;
|
|
unsigned int elem;
|
|
int result,i;
|
|
|
|
if (copy_from_user(&cge, argp, sizeof (cge)))
|
|
return -EFAULT;
|
|
|
|
if (0 != ch_checkrange(ch, cge.cge_type, cge.cge_unit))
|
|
return -EINVAL;
|
|
elem = ch->firsts[cge.cge_type] + cge.cge_unit;
|
|
|
|
buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
|
|
if (!buffer)
|
|
return -ENOMEM;
|
|
mutex_lock(&ch->lock);
|
|
|
|
voltag_retry:
|
|
memset(ch_cmd, 0, sizeof(ch_cmd));
|
|
ch_cmd[0] = READ_ELEMENT_STATUS;
|
|
ch_cmd[1] = ((ch->device->lun & 0x7) << 5) |
|
|
(ch->voltags ? 0x10 : 0) |
|
|
ch_elem_to_typecode(ch,elem);
|
|
ch_cmd[2] = (elem >> 8) & 0xff;
|
|
ch_cmd[3] = elem & 0xff;
|
|
ch_cmd[5] = 1;
|
|
ch_cmd[9] = 255;
|
|
|
|
result = ch_do_scsi(ch, ch_cmd, 12,
|
|
buffer, 256, DMA_FROM_DEVICE);
|
|
if (!result) {
|
|
cge.cge_status = buffer[18];
|
|
cge.cge_flags = 0;
|
|
if (buffer[18] & CESTATUS_EXCEPT) {
|
|
cge.cge_errno = EIO;
|
|
}
|
|
if (buffer[25] & 0x80) {
|
|
cge.cge_flags |= CGE_SRC;
|
|
if (buffer[25] & 0x40)
|
|
cge.cge_flags |= CGE_INVERT;
|
|
elem = (buffer[26]<<8) | buffer[27];
|
|
for (i = 0; i < 4; i++) {
|
|
if (elem >= ch->firsts[i] &&
|
|
elem < ch->firsts[i] + ch->counts[i]) {
|
|
cge.cge_srctype = i;
|
|
cge.cge_srcunit = elem-ch->firsts[i];
|
|
}
|
|
}
|
|
}
|
|
if ((buffer[22] & 0x30) == 0x30) {
|
|
cge.cge_flags |= CGE_IDLUN;
|
|
cge.cge_id = buffer[23];
|
|
cge.cge_lun = buffer[22] & 7;
|
|
}
|
|
if (buffer[9] & 0x80) {
|
|
cge.cge_flags |= CGE_PVOLTAG;
|
|
memcpy(cge.cge_pvoltag,buffer+28,36);
|
|
}
|
|
if (buffer[9] & 0x40) {
|
|
cge.cge_flags |= CGE_AVOLTAG;
|
|
memcpy(cge.cge_avoltag,buffer+64,36);
|
|
}
|
|
} else if (ch->voltags) {
|
|
ch->voltags = 0;
|
|
VPRINTK(KERN_INFO, "device has no volume tag support\n");
|
|
goto voltag_retry;
|
|
}
|
|
kfree(buffer);
|
|
mutex_unlock(&ch->lock);
|
|
|
|
if (copy_to_user(argp, &cge, sizeof (cge)))
|
|
return -EFAULT;
|
|
return result;
|
|
}
|
|
|
|
case CHIOINITELEM:
|
|
{
|
|
mutex_lock(&ch->lock);
|
|
retval = ch_init_elem(ch);
|
|
mutex_unlock(&ch->lock);
|
|
return retval;
|
|
}
|
|
|
|
case CHIOSVOLTAG:
|
|
{
|
|
struct changer_set_voltag csv;
|
|
int elem;
|
|
|
|
if (copy_from_user(&csv, argp, sizeof(csv)))
|
|
return -EFAULT;
|
|
|
|
if (0 != ch_checkrange(ch, csv.csv_type, csv.csv_unit)) {
|
|
DPRINTK("CHIOSVOLTAG: invalid parameter\n");
|
|
return -EBADSLT;
|
|
}
|
|
elem = ch->firsts[csv.csv_type] + csv.csv_unit;
|
|
mutex_lock(&ch->lock);
|
|
retval = ch_set_voltag(ch, elem,
|
|
csv.csv_flags & CSV_AVOLTAG,
|
|
csv.csv_flags & CSV_CLEARTAG,
|
|
csv.csv_voltag);
|
|
mutex_unlock(&ch->lock);
|
|
return retval;
|
|
}
|
|
|
|
default:
|
|
return scsi_ioctl(ch->device, cmd, argp);
|
|
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
|
|
struct changer_element_status32 {
|
|
int ces_type;
|
|
compat_uptr_t ces_data;
|
|
};
|
|
#define CHIOGSTATUS32 _IOW('c', 8,struct changer_element_status32)
|
|
|
|
static long ch_ioctl_compat(struct file * file,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
scsi_changer *ch = file->private_data;
|
|
|
|
switch (cmd) {
|
|
case CHIOGPARAMS:
|
|
case CHIOGVPARAMS:
|
|
case CHIOPOSITION:
|
|
case CHIOMOVE:
|
|
case CHIOEXCHANGE:
|
|
case CHIOGELEM:
|
|
case CHIOINITELEM:
|
|
case CHIOSVOLTAG:
|
|
/* compatible */
|
|
return ch_ioctl(file, cmd, arg);
|
|
case CHIOGSTATUS32:
|
|
{
|
|
struct changer_element_status32 ces32;
|
|
unsigned char __user *data;
|
|
|
|
if (copy_from_user(&ces32, (void __user *)arg, sizeof (ces32)))
|
|
return -EFAULT;
|
|
if (ces32.ces_type < 0 || ces32.ces_type >= CH_TYPES)
|
|
return -EINVAL;
|
|
|
|
data = compat_ptr(ces32.ces_data);
|
|
return ch_gstatus(ch, ces32.ces_type, data);
|
|
}
|
|
default:
|
|
// return scsi_ioctl_compat(ch->device, cmd, (void*)arg);
|
|
return -ENOIOCTLCMD;
|
|
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
|
|
static int ch_probe(struct device *dev)
|
|
{
|
|
struct scsi_device *sd = to_scsi_device(dev);
|
|
struct device *class_dev;
|
|
int ret;
|
|
scsi_changer *ch;
|
|
|
|
if (sd->type != TYPE_MEDIUM_CHANGER)
|
|
return -ENODEV;
|
|
|
|
ch = kzalloc(sizeof(*ch), GFP_KERNEL);
|
|
if (NULL == ch)
|
|
return -ENOMEM;
|
|
|
|
idr_preload(GFP_KERNEL);
|
|
spin_lock(&ch_index_lock);
|
|
ret = idr_alloc(&ch_index_idr, ch, 0, CH_MAX_DEVS + 1, GFP_NOWAIT);
|
|
spin_unlock(&ch_index_lock);
|
|
idr_preload_end();
|
|
|
|
if (ret < 0) {
|
|
if (ret == -ENOSPC)
|
|
ret = -ENODEV;
|
|
goto free_ch;
|
|
}
|
|
|
|
ch->minor = ret;
|
|
sprintf(ch->name,"ch%d",ch->minor);
|
|
|
|
class_dev = device_create(ch_sysfs_class, dev,
|
|
MKDEV(SCSI_CHANGER_MAJOR, ch->minor), ch,
|
|
"s%s", ch->name);
|
|
if (IS_ERR(class_dev)) {
|
|
sdev_printk(KERN_WARNING, sd, "ch%d: device_create failed\n",
|
|
ch->minor);
|
|
ret = PTR_ERR(class_dev);
|
|
goto remove_idr;
|
|
}
|
|
|
|
mutex_init(&ch->lock);
|
|
kref_init(&ch->ref);
|
|
ch->device = sd;
|
|
ret = ch_readconfig(ch);
|
|
if (ret)
|
|
goto destroy_dev;
|
|
if (init)
|
|
ch_init_elem(ch);
|
|
|
|
dev_set_drvdata(dev, ch);
|
|
sdev_printk(KERN_INFO, sd, "Attached scsi changer %s\n", ch->name);
|
|
|
|
return 0;
|
|
destroy_dev:
|
|
device_destroy(ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR, ch->minor));
|
|
remove_idr:
|
|
idr_remove(&ch_index_idr, ch->minor);
|
|
free_ch:
|
|
kfree(ch);
|
|
return ret;
|
|
}
|
|
|
|
static int ch_remove(struct device *dev)
|
|
{
|
|
scsi_changer *ch = dev_get_drvdata(dev);
|
|
|
|
spin_lock(&ch_index_lock);
|
|
idr_remove(&ch_index_idr, ch->minor);
|
|
spin_unlock(&ch_index_lock);
|
|
|
|
device_destroy(ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR,ch->minor));
|
|
kref_put(&ch->ref, ch_destroy);
|
|
return 0;
|
|
}
|
|
|
|
static struct scsi_driver ch_template = {
|
|
.gendrv = {
|
|
.name = "ch",
|
|
.owner = THIS_MODULE,
|
|
.probe = ch_probe,
|
|
.remove = ch_remove,
|
|
},
|
|
};
|
|
|
|
static const struct file_operations changer_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = ch_open,
|
|
.release = ch_release,
|
|
.unlocked_ioctl = ch_ioctl,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = ch_ioctl_compat,
|
|
#endif
|
|
.llseek = noop_llseek,
|
|
};
|
|
|
|
static int __init init_ch_module(void)
|
|
{
|
|
int rc;
|
|
|
|
printk(KERN_INFO "SCSI Media Changer driver v" VERSION " \n");
|
|
ch_sysfs_class = class_create(THIS_MODULE, "scsi_changer");
|
|
if (IS_ERR(ch_sysfs_class)) {
|
|
rc = PTR_ERR(ch_sysfs_class);
|
|
return rc;
|
|
}
|
|
rc = register_chrdev(SCSI_CHANGER_MAJOR,"ch",&changer_fops);
|
|
if (rc < 0) {
|
|
printk("Unable to get major %d for SCSI-Changer\n",
|
|
SCSI_CHANGER_MAJOR);
|
|
goto fail1;
|
|
}
|
|
rc = scsi_register_driver(&ch_template.gendrv);
|
|
if (rc < 0)
|
|
goto fail2;
|
|
return 0;
|
|
|
|
fail2:
|
|
unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
|
|
fail1:
|
|
class_destroy(ch_sysfs_class);
|
|
return rc;
|
|
}
|
|
|
|
static void __exit exit_ch_module(void)
|
|
{
|
|
scsi_unregister_driver(&ch_template.gendrv);
|
|
unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
|
|
class_destroy(ch_sysfs_class);
|
|
idr_destroy(&ch_index_idr);
|
|
}
|
|
|
|
module_init(init_ch_module);
|
|
module_exit(exit_ch_module);
|
|
|
|
/*
|
|
* Local variables:
|
|
* c-basic-offset: 8
|
|
* End:
|
|
*/
|