#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>
#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 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;
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);
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"
};
#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 const struct class ch_sysfs_class = {
.name = "scsi_changer",
};
typedef struct {
struct kref ref;
struct list_head list;
int minor;
char name[8];
struct scsi_device *device;
struct scsi_device **dt;
u_int firsts[CH_TYPES];
u_int counts[CH_TYPES];
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[] = {
{
.sense = ILLEGAL_REQUEST,
.asc = 0x21,
.ascq = 0x01,
.errno = EBADSLT,
},{
.sense = ILLEGAL_REQUEST,
.asc = 0x28,
.ascq = 0x01,
.errno = EBADE,
},{
.sense = ILLEGAL_REQUEST,
.asc = 0x3B,
.ascq = 0x0D,
.errno = EXFULL,
},{
.sense = ILLEGAL_REQUEST,
.asc = 0x3B,
.ascq = 0x0E,
.errno = EBADE,
},{
.sense = ILLEGAL_REQUEST,
.asc = 0x20,
.ascq = 0x00,
.errno = EBADRQC,
},{
}
};
static int ch_find_errno(struct scsi_sense_hdr *sshdr)
{
int i,errno = 0;
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 int buflength, enum req_op op)
{
int errno = 0, timeout, result;
struct scsi_sense_hdr sshdr;
struct scsi_failure failure_defs[] = {
{
.sense = UNIT_ATTENTION,
.asc = SCMD_FAILURE_ASC_ANY,
.ascq = SCMD_FAILURE_ASCQ_ANY,
.allowed = 3,
.result = SAM_STAT_CHECK_CONDITION,
},
{}
};
struct scsi_failures failures = {
.failure_definitions = failure_defs,
};
const struct scsi_exec_args exec_args = {
.sshdr = &sshdr,
.failures = &failures,
};
timeout = (cmd[0] == INITIALIZE_ELEMENT_STATUS)
? timeout_init : timeout_move;
result = scsi_execute_cmd(ch->device, cmd, op, buffer, buflength,
timeout * HZ, MAX_RETRIES, &exec_args);
if (result < 0)
return result;
if (scsi_sense_valid(&sshdr)) {
if (debug)
scsi_print_sense_hdr(ch->device, ch->name, &sshdr);
errno = ch_find_errno(&sshdr);
}
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);
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, REQ_OP_DRV_IN))) {
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, REQ_OP_DRV_IN);
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);
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, REQ_OP_DRV_IN);
if (0 != result) {
cmd[1] |= (1<<3);
result = ch_do_scsi(ch, cmd, 10, buffer, 255, REQ_OP_DRV_IN);
}
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");
}
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]);
}
ch->dt = kzalloc_objs(*ch->dt, ch->counts[CHET_DT]);
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]) {
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, REQ_OP_DRV_IN);
}
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, REQ_OP_DRV_IN);
}
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, REQ_OP_DRV_IN);
}
static void
ch_check_voltag(char *tag)
{
int i;
for (i = 0; i < 32; i++) {
if (tag[i] >= 0x7f || tag[i] < 0x20)
tag[i] = ' ';
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, REQ_OP_DRV_OUT);
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);
ch->device = NULL;
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);
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);
spin_lock(&ch_index_lock);
ch = idr_find(&ch_index_idr, minor);
if (ch == NULL || !kref_get_unless_zero(&ch->ref)) {
spin_unlock(&ch_index_lock);
return -ENXIO;
}
spin_unlock(&ch_index_lock);
if (scsi_device_get(ch->device)) {
kref_put(&ch->ref, ch_destroy);
return -ENXIO;
}
mutex_lock(&ch->lock);
file->private_data = ch;
mutex_unlock(&ch->lock);
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;
}
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(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];
strscpy(vparams.cvp_label1, vendor_labels[0],
sizeof(vparams.cvp_label1));
}
if (ch->counts[CHET_V2]) {
vparams.cvp_n2 = ch->counts[CHET_V2];
strscpy(vparams.cvp_label2, vendor_labels[1],
sizeof(vparams.cvp_label2));
}
if (ch->counts[CHET_V3]) {
vparams.cvp_n3 = ch->counts[CHET_V3];
strscpy(vparams.cvp_label3, vendor_labels[2],
sizeof(vparams.cvp_label3));
}
if (ch->counts[CHET_V4]) {
vparams.cvp_n4 = ch->counts[CHET_V4];
strscpy(vparams.cvp_label4, vendor_labels[3],
sizeof(vparams.cvp_label4));
}
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);
}
#ifdef CONFIG_COMPAT
case CHIOGSTATUS32:
{
struct changer_element_status32 ces32;
if (copy_from_user(&ces32, argp, sizeof(ces32)))
return -EFAULT;
if (ces32.ces_type < 0 || ces32.ces_type >= CH_TYPES)
return -EINVAL;
return ch_gstatus(ch, ces32.ces_type,
compat_ptr(ces32.ces_data));
}
#endif
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);
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, REQ_OP_DRV_IN);
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, file->f_mode & FMODE_WRITE, cmd,
argp);
}
}
static int ch_probe(struct scsi_device *sd)
{
struct device *dev = &sd->sdev_gendev;
struct device *class_dev;
int ret;
scsi_changer *ch;
if (sd->type != TYPE_MEDIUM_CHANGER)
return -ENODEV;
ch = kzalloc_obj(*ch);
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);
ret = scsi_device_get(sd);
if (ret) {
sdev_printk(KERN_WARNING, sd, "ch%d: failed to get device\n",
ch->minor);
goto remove_idr;
}
mutex_init(&ch->lock);
kref_init(&ch->ref);
ch->device = sd;
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 put_device;
}
mutex_lock(&ch->lock);
ret = ch_readconfig(ch);
if (ret) {
mutex_unlock(&ch->lock);
goto destroy_dev;
}
if (init)
ch_init_elem(ch);
mutex_unlock(&ch->lock);
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));
put_device:
scsi_device_put(sd);
remove_idr:
idr_remove(&ch_index_idr, ch->minor);
free_ch:
kfree(ch);
return ret;
}
static void ch_remove(struct scsi_device *sd)
{
struct device *dev = &sd->sdev_gendev;
scsi_changer *ch = dev_get_drvdata(dev);
spin_lock(&ch_index_lock);
idr_remove(&ch_index_idr, ch->minor);
dev_set_drvdata(dev, NULL);
spin_unlock(&ch_index_lock);
device_destroy(&ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR, ch->minor));
scsi_device_put(ch->device);
kref_put(&ch->ref, ch_destroy);
}
static struct scsi_driver ch_template = {
.probe = ch_probe,
.remove = ch_remove,
.gendrv = {
.name = "ch",
.owner = THIS_MODULE,
},
};
static const struct file_operations changer_fops = {
.owner = THIS_MODULE,
.open = ch_open,
.release = ch_release,
.unlocked_ioctl = ch_ioctl,
.compat_ioctl = compat_ptr_ioctl,
.llseek = noop_llseek,
};
static int __init init_ch_module(void)
{
int rc;
printk(KERN_INFO "SCSI Media Changer driver v" VERSION " \n");
rc = class_register(&ch_sysfs_class);
if (rc)
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);
if (rc < 0)
goto fail2;
return 0;
fail2:
unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
fail1:
class_unregister(&ch_sysfs_class);
return rc;
}
static void __exit exit_ch_module(void)
{
scsi_unregister_driver(&ch_template);
unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
class_unregister(&ch_sysfs_class);
idr_destroy(&ch_index_idr);
}
module_init(init_ch_module);
module_exit(exit_ch_module);
