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linux/drivers/scsi/ch.c
Gerd Knorr daa6eda65a [SCSI] add scsi changer driver 
This patch adds a device driver for scsi media changer devices.

Signed-off-by: Gerd Knorr <kraxel@bytesex.org>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2005-05-20 12:53:50 -05:00

1026 lines
24 KiB
C
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/*
* SCSI Media Changer device driver for Linux 2.6
*
* (c) 1996-2003 Gerd Knorr <kraxel@bytesex.org>
*
*/
#define VERSION "0.25"
#include <linux/config.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/sched.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/devfs_fs_kernel.h>
#include <linux/ioctl32.h>
#include <linux/compat.h>
#include <linux/chio.h> /* here are all the ioctls */
#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_request.h>
#include <scsi/scsi_dbg.h>
#define CH_DT_MAX 16
#define CH_TYPES 8
MODULE_DESCRIPTION("device driver for scsi media changer devices");
MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org>");
MODULE_LICENSE("GPL");
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 char *vendor_labels[CH_TYPES-4] = {
"v0", "v1", "v2", "v3"
};
// module_param_string_array(vendor_labels, NULL, 0444);
#define dprintk(fmt, arg...) if (debug) \
printk(KERN_DEBUG "%s: " fmt, ch->name , ## arg)
#define vprintk(fmt, arg...) if (verbose) \
printk(KERN_INFO "%s: " fmt, ch->name , ## arg)
/* ------------------------------------------------------------------- */
#define MAX_RETRIES 1
static int ch_probe(struct device *);
static int ch_remove(struct device *);
static int ch_open(struct inode * inode, struct file * filp);
static int ch_release(struct inode * inode, struct file * filp);
static int ch_ioctl(struct inode * inode, struct file * filp,
unsigned int cmd, unsigned long arg);
#ifdef CONFIG_COMPAT
static long ch_ioctl_compat(struct file * filp,
unsigned int cmd, unsigned long arg);
#endif
static struct class_simple * ch_sysfs_class;
typedef struct {
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 semaphore lock;
} scsi_changer;
static LIST_HEAD(ch_devlist);
static spinlock_t ch_devlist_lock = SPIN_LOCK_UNLOCKED;
static int ch_devcount;
static struct scsi_driver ch_template =
{
.owner = THIS_MODULE,
.gendrv = {
.name = "ch",
.probe = ch_probe,
.remove = ch_remove,
},
};
static struct file_operations changer_fops =
{
.owner = THIS_MODULE,
.open = ch_open,
.release = ch_release,
.ioctl = ch_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = ch_ioctl_compat,
#endif
};
static struct {
unsigned char sense;
unsigned char asc;
unsigned char ascq;
int errno;
} 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(unsigned char *sense_buffer)
{
int i,errno = 0;
/* Check to see if additional sense information is available */
if (sense_buffer[7] > 5 &&
sense_buffer[12] != 0) {
for (i = 0; err[i].errno != 0; i++) {
if (err[i].sense == sense_buffer[ 2] &&
err[i].asc == sense_buffer[12] &&
err[i].ascq == sense_buffer[13]) {
errno = -err[i].errno;
break;
}
}
}
if (errno == 0)
errno = -EIO;
return errno;
}
static int
ch_do_scsi(scsi_changer *ch, unsigned char *cmd,
void *buffer, unsigned buflength,
enum dma_data_direction direction)
{
int errno, retries = 0, timeout;
struct scsi_request *sr;
sr = scsi_allocate_request(ch->device, GFP_KERNEL);
if (NULL == sr)
return -ENOMEM;
timeout = (cmd[0] == INITIALIZE_ELEMENT_STATUS)
? timeout_init : timeout_move;
retry:
errno = 0;
if (debug) {
dprintk("command: ");
__scsi_print_command(cmd);
}
scsi_wait_req(sr, cmd, buffer, buflength,
timeout * HZ, MAX_RETRIES);
dprintk("result: 0x%x\n",sr->sr_result);
if (driver_byte(sr->sr_result) & DRIVER_SENSE) {
if (debug)
scsi_print_req_sense(ch->name, sr);
errno = ch_find_errno(sr->sr_sense_buffer);
switch(sr->sr_sense_buffer[2] & 0xf) {
case UNIT_ATTENTION:
ch->unit_attention = 1;
if (retries++ < 3)
goto retry;
break;
}
}
scsi_release_request(sr);
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 << 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, 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("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("INITIALIZE ELEMENT STATUS, may take some time ...\n");
memset(cmd,0,sizeof(cmd));
cmd[0] = INITIALIZE_ELEMENT_STATUS;
cmd[1] = ch->device->lun << 5;
err = ch_do_scsi(ch, cmd, NULL, 0, DMA_NONE);
vprintk("... 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 = kmalloc(512, GFP_KERNEL | GFP_DMA);
if (!buffer)
return -ENOMEM;
memset(buffer,0,512);
memset(cmd,0,sizeof(cmd));
cmd[0] = MODE_SENSE;
cmd[1] = ch->device->lun << 5;
cmd[2] = 0x1d;
cmd[4] = 255;
result = ch_do_scsi(ch, cmd, buffer, 255, DMA_FROM_DEVICE);
if (0 != result) {
cmd[1] |= (1<<3);
result = ch_do_scsi(ch, cmd, 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("type #1 (mt): 0x%x+%d [medium transport]\n",
ch->firsts[CHET_MT],
ch->counts[CHET_MT]);
vprintk("type #2 (st): 0x%x+%d [storage]\n",
ch->firsts[CHET_ST],
ch->counts[CHET_ST]);
vprintk("type #3 (ie): 0x%x+%d [import/export]\n",
ch->firsts[CHET_IE],
ch->counts[CHET_IE]);
vprintk("type #4 (dt): 0x%x+%d [data transfer]\n",
ch->firsts[CHET_DT],
ch->counts[CHET_DT]);
} else {
vprintk("reading element address assigment 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("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 = kmalloc(ch->counts[CHET_DT]*sizeof(struct scsi_device),
GFP_KERNEL);
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("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("dt 0x%x: READ ELEMENT STATUS failed\n",
elem+ch->firsts[CHET_DT]);
} else {
vprintk("dt 0x%x: ",elem+ch->firsts[CHET_DT]);
if (data[6] & 0x80) {
if (verbose)
printk("not this SCSI bus\n");
ch->dt[elem] = NULL;
} else if (0 == (data[6] & 0x30)) {
if (verbose)
printk("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) {
if (verbose)
printk("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 */
if (verbose)
printk("Huh? device not found!\n");
} else {
if (verbose)
printk("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 << 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, 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 << 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, 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 << 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, 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 = kmalloc(512, GFP_KERNEL);
if (!buffer)
return -ENOMEM;
memset(buffer,0,512);
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 << 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, buffer, 256, DMA_TO_DEVICE);
kfree(buffer);
return result;
}
static int ch_gstatus(scsi_changer *ch, int type, unsigned char *dest)
{
int retval = 0;
u_char data[16];
unsigned int i;
down(&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("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;
}
up(&ch->lock);
return retval;
}
/* ------------------------------------------------------------------------ */
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;
return 0;
}
static int
ch_open(struct inode *inode, struct file *file)
{
scsi_changer *tmp, *ch;
int minor = iminor(inode);
spin_lock(&ch_devlist_lock);
ch = NULL;
list_for_each_entry(tmp,&ch_devlist,list) {
if (tmp->minor == minor)
ch = tmp;
}
if (NULL == ch || scsi_device_get(ch->device)) {
spin_unlock(&ch_devlist_lock);
return -ENXIO;
}
spin_unlock(&ch_devlist_lock);
file->private_data = ch;
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 int ch_ioctl(struct inode * inode, struct file * file,
unsigned int cmd, unsigned long arg)
{
scsi_changer *ch = file->private_data;
int 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((void *) arg, &params, 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((void *) arg, &vparams, sizeof(vparams)))
return -EFAULT;
return 0;
}
case CHIOPOSITION:
{
struct changer_position pos;
if (copy_from_user(&pos, (void*)arg, sizeof (pos)))
return -EFAULT;
if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) {
dprintk("CHIOPOSITION: invalid parameter\n");
return -EBADSLT;
}
down(&ch->lock);
retval = ch_position(ch,0,
ch->firsts[pos.cp_type] + pos.cp_unit,
pos.cp_flags & CP_INVERT);
up(&ch->lock);
return retval;
}
case CHIOMOVE:
{
struct changer_move mv;
if (copy_from_user(&mv, (void*)arg, 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;
}
down(&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);
up(&ch->lock);
return retval;
}
case CHIOEXCHANGE:
{
struct changer_exchange mv;
if (copy_from_user(&mv, (void*)arg, 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;
}
down(&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);
up(&ch->lock);
return retval;
}
case CHIOGSTATUS:
{
struct changer_element_status ces;
if (copy_from_user(&ces, (void*)arg, 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 cmd[12];
u_char *buffer;
unsigned int elem;
int result,i;
if (copy_from_user(&cge, (void*)arg, 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;
down(&ch->lock);
voltag_retry:
memset(cmd,0,sizeof(cmd));
cmd[0] = READ_ELEMENT_STATUS;
cmd[1] = (ch->device->lun << 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, buffer, 256, DMA_FROM_DEVICE))) {
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("device has no volume tag support\n");
goto voltag_retry;
}
kfree(buffer);
up(&ch->lock);
if (copy_to_user((void*)arg, &cge, sizeof (cge)))
return -EFAULT;
return result;
}
case CHIOINITELEM:
{
down(&ch->lock);
retval = ch_init_elem(ch);
up(&ch->lock);
return retval;
}
case CHIOSVOLTAG:
{
struct changer_set_voltag csv;
int elem;
if (copy_from_user(&csv, (void*)arg, 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;
down(&ch->lock);
retval = ch_set_voltag(ch, elem,
csv.csv_flags & CSV_AVOLTAG,
csv.csv_flags & CSV_CLEARTAG,
csv.csv_voltag);
up(&ch->lock);
return retval;
}
default:
return scsi_ioctl(ch->device, cmd, (void*)arg);
}
}
#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(NULL /* inode, unused */,
file, cmd, arg);
case CHIOGSTATUS32:
{
struct changer_element_status32 ces32;
unsigned char *data;
if (copy_from_user(&ces32, (void*)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);
scsi_changer *ch;
if (sd->type != TYPE_MEDIUM_CHANGER)
return -ENODEV;
ch = kmalloc(sizeof(*ch), GFP_KERNEL);
if (NULL == ch)
return -ENOMEM;
memset(ch,0,sizeof(*ch));
ch->minor = ch_devcount;
sprintf(ch->name,"ch%d",ch->minor);
init_MUTEX(&ch->lock);
ch->device = sd;
ch_readconfig(ch);
if (init)
ch_init_elem(ch);
devfs_mk_cdev(MKDEV(SCSI_CHANGER_MAJOR,ch->minor),
S_IFCHR | S_IRUGO | S_IWUGO, ch->name);
class_simple_device_add(ch_sysfs_class,
MKDEV(SCSI_CHANGER_MAJOR,ch->minor),
dev, "s%s", ch->name);
printk(KERN_INFO "Attached scsi changer %s "
"at scsi%d, channel %d, id %d, lun %d\n",
ch->name, sd->host->host_no, sd->channel, sd->id, sd->lun);
spin_lock(&ch_devlist_lock);
list_add_tail(&ch->list,&ch_devlist);
ch_devcount++;
spin_unlock(&ch_devlist_lock);
return 0;
}
static int ch_remove(struct device *dev)
{
struct scsi_device *sd = to_scsi_device(dev);
scsi_changer *tmp, *ch;
spin_lock(&ch_devlist_lock);
ch = NULL;
list_for_each_entry(tmp,&ch_devlist,list) {
if (tmp->device == sd)
ch = tmp;
}
BUG_ON(NULL == ch);
list_del(&ch->list);
spin_unlock(&ch_devlist_lock);
class_simple_device_remove(MKDEV(SCSI_CHANGER_MAJOR,ch->minor));
devfs_remove(ch->name);
kfree(ch->dt);
kfree(ch);
ch_devcount--;
return 0;
}
static int __init init_ch_module(void)
{
int rc;
printk(KERN_INFO "SCSI Media Changer driver v" VERSION " \n");
ch_sysfs_class = class_simple_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_simple_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_simple_destroy(ch_sysfs_class);
}
module_init(init_ch_module);
module_exit(exit_ch_module);
/*
* Local variables:
* c-basic-offset: 8
* End:
*/
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