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 <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

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);

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 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 * 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 LIST_HEAD(ch_devlist);
static DEFINE_SPINLOCK(ch_devlist_lock);
static int ch_devcount;

static struct scsi_driver ch_template =
{
	.owner     	= THIS_MODULE,
	.gendrv     	= {
		.name	= "ch",
		.probe  = ch_probe,
		.remove = ch_remove,
	},
};

static const 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 const 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    =