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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    = 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; err[i].errno != 0; i++) {
                  if (err[i].sense == sshdr->sense_key &&
                      err[i].asc   == sshdr->asc &&
                      err[i].ascq  == sshdr->ascq) {
                        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, result;
      struct scsi_sense_hdr sshdr;
      
      timeout = (cmd[0] == INITIALIZE_ELEMENT_STATUS)
            ? timeout_init : timeout_move;

 retry:
      errno = 0;
      if (debug) {
            dprintk("command: ");
            __scsi_print_command(cmd);
      }

        result = scsi_execute_req(ch->device, cmd, direction, buffer,
                          buflength, &sshdr, timeout * HZ,
                          MAX_RETRIES);

      dprintk("result: 0x%x\n",result);
      if (driver_byte(result) & DRIVER_SENSE) {
            if (debug)
                  scsi_print_sense_hdr(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 << 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 = kzalloc(512, GFP_KERNEL | GFP_DMA);
      if (!buffer)
            return -ENOMEM;
      
      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 = 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 << 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 __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("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 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;
      void __user *argp = (void __user *)arg;
      
      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, &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(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  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(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);
            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(NULL /* inode, unused */,
                        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);
      scsi_changer *ch;
      
      if (sd->type != TYPE_MEDIUM_CHANGER)
            return -ENODEV;
    
      ch = kzalloc(sizeof(*ch), GFP_KERNEL);
      if (NULL == ch)
            return -ENOMEM;

      ch->minor = ch_devcount;
      sprintf(ch->name,"ch%d",ch->minor);
      mutex_init(&ch->lock);
      ch->device = sd;
      ch_readconfig(ch);
      if (init)
            ch_init_elem(ch);

      class_device_create(ch_sysfs_class, NULL,
                      MKDEV(SCSI_CHANGER_MAJOR,ch->minor),
                      dev, "s%s", ch->name);

      sdev_printk(KERN_INFO, sd, "Attached scsi changer %s\n", ch->name);
      
      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_device_destroy(ch_sysfs_class,
                       MKDEV(SCSI_CHANGER_MAJOR,ch->minor));
      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_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);
}

module_init(init_ch_module);
module_exit(exit_ch_module);

/*
 * Local variables:
 * c-basic-offset: 8
 * End:
 */

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