path: root/drivers/scsi/ch.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/smp_lock.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 = 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 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 struct class * 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 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) &&