2 * SCSI Media Changer device driver for Linux 2.6
4 * (c) 1996-2003 Gerd Knorr <kraxel@bytesex.org>
10 #include <linux/module.h>
11 #include <linux/init.h>
13 #include <linux/kernel.h>
15 #include <linux/major.h>
16 #include <linux/string.h>
17 #include <linux/errno.h>
18 #include <linux/interrupt.h>
19 #include <linux/blkdev.h>
20 #include <linux/completion.h>
21 #include <linux/compat.h>
22 #include <linux/chio.h> /* here are all the ioctls */
23 #include <linux/mutex.h>
24 #include <linux/idr.h>
25 #include <linux/slab.h>
27 #include <scsi/scsi.h>
28 #include <scsi/scsi_cmnd.h>
29 #include <scsi/scsi_driver.h>
30 #include <scsi/scsi_ioctl.h>
31 #include <scsi/scsi_host.h>
32 #include <scsi/scsi_device.h>
33 #include <scsi/scsi_eh.h>
34 #include <scsi/scsi_dbg.h>
38 #define CH_MAX_DEVS 128
40 MODULE_DESCRIPTION("device driver for scsi media changer devices");
41 MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org>");
42 MODULE_LICENSE("GPL");
43 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_CHANGER_MAJOR);
44 MODULE_ALIAS_SCSI_DEVICE(TYPE_MEDIUM_CHANGER);
46 static DEFINE_MUTEX(ch_mutex);
48 module_param(init, int, 0444);
49 MODULE_PARM_DESC(init, \
50 "initialize element status on driver load (default: on)");
52 static int timeout_move = 300;
53 module_param(timeout_move, int, 0644);
54 MODULE_PARM_DESC(timeout_move,"timeout for move commands "
55 "(default: 300 seconds)");
57 static int timeout_init = 3600;
58 module_param(timeout_init, int, 0644);
59 MODULE_PARM_DESC(timeout_init,"timeout for INITIALIZE ELEMENT STATUS "
60 "(default: 3600 seconds)");
62 static int verbose = 1;
63 module_param(verbose, int, 0644);
64 MODULE_PARM_DESC(verbose,"be verbose (default: on)");
67 module_param(debug, int, 0644);
68 MODULE_PARM_DESC(debug,"enable/disable debug messages, also prints more "
69 "detailed sense codes on scsi errors (default: off)");
71 static int dt_id[CH_DT_MAX] = { [ 0 ... (CH_DT_MAX-1) ] = -1 };
72 static int dt_lun[CH_DT_MAX];
73 module_param_array(dt_id, int, NULL, 0444);
74 module_param_array(dt_lun, int, NULL, 0444);
76 /* tell the driver about vendor-specific slots */
77 static int vendor_firsts[CH_TYPES-4];
78 static int vendor_counts[CH_TYPES-4];
79 module_param_array(vendor_firsts, int, NULL, 0444);
80 module_param_array(vendor_counts, int, NULL, 0444);
82 static const char * vendor_labels[CH_TYPES-4] = {
83 "v0", "v1", "v2", "v3"
85 // module_param_string_array(vendor_labels, NULL, 0444);
87 #define ch_printk(prefix, ch, fmt, a...) \
88 sdev_prefix_printk(prefix, (ch)->device, (ch)->name, fmt, ##a)
90 #define DPRINTK(fmt, arg...) \
93 ch_printk(KERN_DEBUG, ch, fmt, ##arg); \
95 #define VPRINTK(level, fmt, arg...) \
98 ch_printk(level, ch, fmt, ##arg); \
101 /* ------------------------------------------------------------------- */
103 #define MAX_RETRIES 1
105 static struct class * ch_sysfs_class;
108 struct list_head list;
111 struct scsi_device *device;
112 struct scsi_device **dt; /* ptrs to data transfer elements */
113 u_int firsts[CH_TYPES];
114 u_int counts[CH_TYPES];
115 u_int unit_attention;
120 static DEFINE_IDR(ch_index_idr);
121 static DEFINE_SPINLOCK(ch_index_lock);
123 static const struct {
129 /* Just filled in what looks right. Hav'nt checked any standard paper for
130 these errno assignments, so they may be wrong... */
132 .sense = ILLEGAL_REQUEST,
135 .errno = EBADSLT, /* Invalid element address */
137 .sense = ILLEGAL_REQUEST,
140 .errno = EBADE, /* Import or export element accessed */
142 .sense = ILLEGAL_REQUEST,
145 .errno = EXFULL, /* Medium destination element full */
147 .sense = ILLEGAL_REQUEST,
150 .errno = EBADE, /* Medium source element empty */
152 .sense = ILLEGAL_REQUEST,
155 .errno = EBADRQC, /* Invalid command operation code */
161 /* ------------------------------------------------------------------- */
163 static int ch_find_errno(struct scsi_sense_hdr *sshdr)
167 /* Check to see if additional sense information is available */
168 if (scsi_sense_valid(sshdr) &&
170 for (i = 0; ch_err[i].errno != 0; i++) {
171 if (ch_err[i].sense == sshdr->sense_key &&
172 ch_err[i].asc == sshdr->asc &&
173 ch_err[i].ascq == sshdr->ascq) {
174 errno = -ch_err[i].errno;
185 ch_do_scsi(scsi_changer *ch, unsigned char *cmd, int cmd_len,
186 void *buffer, unsigned buflength,
187 enum dma_data_direction direction)
189 int errno, retries = 0, timeout, result;
190 struct scsi_sense_hdr sshdr;
192 timeout = (cmd[0] == INITIALIZE_ELEMENT_STATUS)
193 ? timeout_init : timeout_move;
198 DPRINTK("command: ");
199 __scsi_print_command(cmd, cmd_len);
202 result = scsi_execute_req(ch->device, cmd, direction, buffer,
203 buflength, &sshdr, timeout * HZ,
206 DPRINTK("result: 0x%x\n",result);
207 if (driver_byte(result) & DRIVER_SENSE) {
209 scsi_print_sense_hdr(ch->device, ch->name, &sshdr);
210 errno = ch_find_errno(&sshdr);
212 switch(sshdr.sense_key) {
214 ch->unit_attention = 1;
223 /* ------------------------------------------------------------------------ */
226 ch_elem_to_typecode(scsi_changer *ch, u_int elem)
230 for (i = 0; i < CH_TYPES; i++) {
231 if (elem >= ch->firsts[i] &&
232 elem < ch->firsts[i] +
240 ch_read_element_status(scsi_changer *ch, u_int elem, char *data)
246 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
251 memset(cmd,0,sizeof(cmd));
252 cmd[0] = READ_ELEMENT_STATUS;
253 cmd[1] = ((ch->device->lun & 0x7) << 5) |
254 (ch->voltags ? 0x10 : 0) |
255 ch_elem_to_typecode(ch,elem);
256 cmd[2] = (elem >> 8) & 0xff;
257 cmd[3] = elem & 0xff;
260 if (0 == (result = ch_do_scsi(ch, cmd, 12,
261 buffer, 256, DMA_FROM_DEVICE))) {
262 if (((buffer[16] << 8) | buffer[17]) != elem) {
263 DPRINTK("asked for element 0x%02x, got 0x%02x\n",
264 elem,(buffer[16] << 8) | buffer[17]);
268 memcpy(data,buffer+16,16);
272 VPRINTK(KERN_INFO, "device has no volume tag support\n");
275 DPRINTK("READ ELEMENT STATUS for element 0x%x failed\n",elem);
282 ch_init_elem(scsi_changer *ch)
287 VPRINTK(KERN_INFO, "INITIALIZE ELEMENT STATUS, may take some time ...\n");
288 memset(cmd,0,sizeof(cmd));
289 cmd[0] = INITIALIZE_ELEMENT_STATUS;
290 cmd[1] = (ch->device->lun & 0x7) << 5;
291 err = ch_do_scsi(ch, cmd, 6, NULL, 0, DMA_NONE);
292 VPRINTK(KERN_INFO, "... finished\n");
297 ch_readconfig(scsi_changer *ch)
299 u_char cmd[10], data[16];
304 buffer = kzalloc(512, GFP_KERNEL | GFP_DMA);
308 memset(cmd,0,sizeof(cmd));
310 cmd[1] = (ch->device->lun & 0x7) << 5;
313 result = ch_do_scsi(ch, cmd, 10, buffer, 255, DMA_FROM_DEVICE);
316 result = ch_do_scsi(ch, cmd, 10, buffer, 255, DMA_FROM_DEVICE);
319 ch->firsts[CHET_MT] =
320 (buffer[buffer[3]+ 6] << 8) | buffer[buffer[3]+ 7];
321 ch->counts[CHET_MT] =
322 (buffer[buffer[3]+ 8] << 8) | buffer[buffer[3]+ 9];
323 ch->firsts[CHET_ST] =
324 (buffer[buffer[3]+10] << 8) | buffer[buffer[3]+11];
325 ch->counts[CHET_ST] =
326 (buffer[buffer[3]+12] << 8) | buffer[buffer[3]+13];
327 ch->firsts[CHET_IE] =
328 (buffer[buffer[3]+14] << 8) | buffer[buffer[3]+15];
329 ch->counts[CHET_IE] =
330 (buffer[buffer[3]+16] << 8) | buffer[buffer[3]+17];
331 ch->firsts[CHET_DT] =
332 (buffer[buffer[3]+18] << 8) | buffer[buffer[3]+19];
333 ch->counts[CHET_DT] =
334 (buffer[buffer[3]+20] << 8) | buffer[buffer[3]+21];
335 VPRINTK(KERN_INFO, "type #1 (mt): 0x%x+%d [medium transport]\n",
337 ch->counts[CHET_MT]);
338 VPRINTK(KERN_INFO, "type #2 (st): 0x%x+%d [storage]\n",
340 ch->counts[CHET_ST]);
341 VPRINTK(KERN_INFO, "type #3 (ie): 0x%x+%d [import/export]\n",
343 ch->counts[CHET_IE]);
344 VPRINTK(KERN_INFO, "type #4 (dt): 0x%x+%d [data transfer]\n",
346 ch->counts[CHET_DT]);
348 VPRINTK(KERN_INFO, "reading element address assigment page failed!\n");
351 /* vendor specific element types */
352 for (i = 0; i < 4; i++) {
353 if (0 == vendor_counts[i])
355 if (NULL == vendor_labels[i])
357 ch->firsts[CHET_V1+i] = vendor_firsts[i];
358 ch->counts[CHET_V1+i] = vendor_counts[i];
359 VPRINTK(KERN_INFO, "type #%d (v%d): 0x%x+%d [%s, vendor specific]\n",
360 i+5,i+1,vendor_firsts[i],vendor_counts[i],
364 /* look up the devices of the data transfer elements */
365 ch->dt = kcalloc(ch->counts[CHET_DT], sizeof(*ch->dt),
373 for (elem = 0; elem < ch->counts[CHET_DT]; elem++) {
376 if (elem < CH_DT_MAX && -1 != dt_id[elem]) {
379 VPRINTK(KERN_INFO, "dt 0x%x: [insmod option] ",
380 elem+ch->firsts[CHET_DT]);
381 } else if (0 != ch_read_element_status
382 (ch,elem+ch->firsts[CHET_DT],data)) {
383 VPRINTK(KERN_INFO, "dt 0x%x: READ ELEMENT STATUS failed\n",
384 elem+ch->firsts[CHET_DT]);
386 VPRINTK(KERN_INFO, "dt 0x%x: ",elem+ch->firsts[CHET_DT]);
387 if (data[6] & 0x80) {
388 VPRINTK(KERN_CONT, "not this SCSI bus\n");
390 } else if (0 == (data[6] & 0x30)) {
391 VPRINTK(KERN_CONT, "ID/LUN unknown\n");
396 if (data[6] & 0x20) id = data[7];
397 if (data[6] & 0x10) lun = data[6] & 7;
401 VPRINTK(KERN_CONT, "ID %i, LUN %i, ",id,lun);
403 scsi_device_lookup(ch->device->host,
407 /* should not happen */
408 VPRINTK(KERN_CONT, "Huh? device not found!\n");
410 VPRINTK(KERN_CONT, "name: %8.8s %16.16s %4.4s\n",
411 ch->dt[elem]->vendor,
423 /* ------------------------------------------------------------------------ */
426 ch_position(scsi_changer *ch, u_int trans, u_int elem, int rotate)
430 DPRINTK("position: 0x%x\n",elem);
432 trans = ch->firsts[CHET_MT];
433 memset(cmd,0,sizeof(cmd));
434 cmd[0] = POSITION_TO_ELEMENT;
435 cmd[1] = (ch->device->lun & 0x7) << 5;
436 cmd[2] = (trans >> 8) & 0xff;
437 cmd[3] = trans & 0xff;
438 cmd[4] = (elem >> 8) & 0xff;
439 cmd[5] = elem & 0xff;
440 cmd[8] = rotate ? 1 : 0;
441 return ch_do_scsi(ch, cmd, 10, NULL, 0, DMA_NONE);
445 ch_move(scsi_changer *ch, u_int trans, u_int src, u_int dest, int rotate)
449 DPRINTK("move: 0x%x => 0x%x\n",src,dest);
451 trans = ch->firsts[CHET_MT];
452 memset(cmd,0,sizeof(cmd));
453 cmd[0] = MOVE_MEDIUM;
454 cmd[1] = (ch->device->lun & 0x7) << 5;
455 cmd[2] = (trans >> 8) & 0xff;
456 cmd[3] = trans & 0xff;
457 cmd[4] = (src >> 8) & 0xff;
459 cmd[6] = (dest >> 8) & 0xff;
460 cmd[7] = dest & 0xff;
461 cmd[10] = rotate ? 1 : 0;
462 return ch_do_scsi(ch, cmd, 12, NULL,0, DMA_NONE);
466 ch_exchange(scsi_changer *ch, u_int trans, u_int src,
467 u_int dest1, u_int dest2, int rotate1, int rotate2)
471 DPRINTK("exchange: 0x%x => 0x%x => 0x%x\n",
474 trans = ch->firsts[CHET_MT];
475 memset(cmd,0,sizeof(cmd));
476 cmd[0] = EXCHANGE_MEDIUM;
477 cmd[1] = (ch->device->lun & 0x7) << 5;
478 cmd[2] = (trans >> 8) & 0xff;
479 cmd[3] = trans & 0xff;
480 cmd[4] = (src >> 8) & 0xff;
482 cmd[6] = (dest1 >> 8) & 0xff;
483 cmd[7] = dest1 & 0xff;
484 cmd[8] = (dest2 >> 8) & 0xff;
485 cmd[9] = dest2 & 0xff;
486 cmd[10] = (rotate1 ? 1 : 0) | (rotate2 ? 2 : 0);
488 return ch_do_scsi(ch, cmd, 12, NULL, 0, DMA_NONE);
492 ch_check_voltag(char *tag)
496 for (i = 0; i < 32; i++) {
497 /* restrict to ascii */
498 if (tag[i] >= 0x7f || tag[i] < 0x20)
500 /* don't allow search wildcards */
508 ch_set_voltag(scsi_changer *ch, u_int elem,
509 int alternate, int clear, u_char *tag)
515 buffer = kzalloc(512, GFP_KERNEL);
519 DPRINTK("%s %s voltag: 0x%x => \"%s\"\n",
520 clear ? "clear" : "set",
521 alternate ? "alternate" : "primary",
523 memset(cmd,0,sizeof(cmd));
524 cmd[0] = SEND_VOLUME_TAG;
525 cmd[1] = ((ch->device->lun & 0x7) << 5) |
526 ch_elem_to_typecode(ch,elem);
527 cmd[2] = (elem >> 8) & 0xff;
528 cmd[3] = elem & 0xff;
530 ? (alternate ? 0x0d : 0x0c)
531 : (alternate ? 0x0b : 0x0a);
535 memcpy(buffer,tag,32);
536 ch_check_voltag(buffer);
538 result = ch_do_scsi(ch, cmd, 12, buffer, 256, DMA_TO_DEVICE);
543 static int ch_gstatus(scsi_changer *ch, int type, unsigned char __user *dest)
549 mutex_lock(&ch->lock);
550 for (i = 0; i < ch->counts[type]; i++) {
551 if (0 != ch_read_element_status
552 (ch, ch->firsts[type]+i,data)) {
556 put_user(data[2], dest+i);
557 if (data[2] & CESTATUS_EXCEPT)
558 VPRINTK(KERN_INFO, "element 0x%x: asc=0x%x, ascq=0x%x\n",
560 (int)data[4],(int)data[5]);
561 retval = ch_read_element_status
562 (ch, ch->firsts[type]+i,data);
566 mutex_unlock(&ch->lock);
570 /* ------------------------------------------------------------------------ */
573 ch_release(struct inode *inode, struct file *file)
575 scsi_changer *ch = file->private_data;
577 scsi_device_put(ch->device);
578 file->private_data = NULL;
583 ch_open(struct inode *inode, struct file *file)
586 int minor = iminor(inode);
588 mutex_lock(&ch_mutex);
589 spin_lock(&ch_index_lock);
590 ch = idr_find(&ch_index_idr, minor);
592 if (NULL == ch || scsi_device_get(ch->device)) {
593 spin_unlock(&ch_index_lock);
594 mutex_unlock(&ch_mutex);
597 spin_unlock(&ch_index_lock);
599 file->private_data = ch;
600 mutex_unlock(&ch_mutex);
605 ch_checkrange(scsi_changer *ch, unsigned int type, unsigned int unit)
607 if (type >= CH_TYPES || unit >= ch->counts[type])
612 static long ch_ioctl(struct file *file,
613 unsigned int cmd, unsigned long arg)
615 scsi_changer *ch = file->private_data;
617 void __user *argp = (void __user *)arg;
619 retval = scsi_ioctl_block_when_processing_errors(ch->device, cmd,
620 file->f_flags & O_NDELAY);
627 struct changer_params params;
629 params.cp_curpicker = 0;
630 params.cp_npickers = ch->counts[CHET_MT];
631 params.cp_nslots = ch->counts[CHET_ST];
632 params.cp_nportals = ch->counts[CHET_IE];
633 params.cp_ndrives = ch->counts[CHET_DT];
635 if (copy_to_user(argp, ¶ms, sizeof(params)))
641 struct changer_vendor_params vparams;
643 memset(&vparams,0,sizeof(vparams));
644 if (ch->counts[CHET_V1]) {
645 vparams.cvp_n1 = ch->counts[CHET_V1];
646 strncpy(vparams.cvp_label1,vendor_labels[0],16);
648 if (ch->counts[CHET_V2]) {
649 vparams.cvp_n2 = ch->counts[CHET_V2];
650 strncpy(vparams.cvp_label2,vendor_labels[1],16);
652 if (ch->counts[CHET_V3]) {
653 vparams.cvp_n3 = ch->counts[CHET_V3];
654 strncpy(vparams.cvp_label3,vendor_labels[2],16);
656 if (ch->counts[CHET_V4]) {
657 vparams.cvp_n4 = ch->counts[CHET_V4];
658 strncpy(vparams.cvp_label4,vendor_labels[3],16);
660 if (copy_to_user(argp, &vparams, sizeof(vparams)))
667 struct changer_position pos;
669 if (copy_from_user(&pos, argp, sizeof (pos)))
672 if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) {
673 DPRINTK("CHIOPOSITION: invalid parameter\n");
676 mutex_lock(&ch->lock);
677 retval = ch_position(ch,0,
678 ch->firsts[pos.cp_type] + pos.cp_unit,
679 pos.cp_flags & CP_INVERT);
680 mutex_unlock(&ch->lock);
686 struct changer_move mv;
688 if (copy_from_user(&mv, argp, sizeof (mv)))
691 if (0 != ch_checkrange(ch, mv.cm_fromtype, mv.cm_fromunit) ||
692 0 != ch_checkrange(ch, mv.cm_totype, mv.cm_tounit )) {
693 DPRINTK("CHIOMOVE: invalid parameter\n");
697 mutex_lock(&ch->lock);
698 retval = ch_move(ch,0,
699 ch->firsts[mv.cm_fromtype] + mv.cm_fromunit,
700 ch->firsts[mv.cm_totype] + mv.cm_tounit,
701 mv.cm_flags & CM_INVERT);
702 mutex_unlock(&ch->lock);
708 struct changer_exchange mv;
710 if (copy_from_user(&mv, argp, sizeof (mv)))
713 if (0 != ch_checkrange(ch, mv.ce_srctype, mv.ce_srcunit ) ||
714 0 != ch_checkrange(ch, mv.ce_fdsttype, mv.ce_fdstunit) ||
715 0 != ch_checkrange(ch, mv.ce_sdsttype, mv.ce_sdstunit)) {
716 DPRINTK("CHIOEXCHANGE: invalid parameter\n");
720 mutex_lock(&ch->lock);
723 ch->firsts[mv.ce_srctype] + mv.ce_srcunit,
724 ch->firsts[mv.ce_fdsttype] + mv.ce_fdstunit,
725 ch->firsts[mv.ce_sdsttype] + mv.ce_sdstunit,
726 mv.ce_flags & CE_INVERT1, mv.ce_flags & CE_INVERT2);
727 mutex_unlock(&ch->lock);
733 struct changer_element_status ces;
735 if (copy_from_user(&ces, argp, sizeof (ces)))
737 if (ces.ces_type < 0 || ces.ces_type >= CH_TYPES)
740 return ch_gstatus(ch, ces.ces_type, ces.ces_data);
745 struct changer_get_element cge;
751 if (copy_from_user(&cge, argp, sizeof (cge)))
754 if (0 != ch_checkrange(ch, cge.cge_type, cge.cge_unit))
756 elem = ch->firsts[cge.cge_type] + cge.cge_unit;
758 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
761 mutex_lock(&ch->lock);
764 memset(ch_cmd, 0, sizeof(ch_cmd));
765 ch_cmd[0] = READ_ELEMENT_STATUS;
766 ch_cmd[1] = ((ch->device->lun & 0x7) << 5) |
767 (ch->voltags ? 0x10 : 0) |
768 ch_elem_to_typecode(ch,elem);
769 ch_cmd[2] = (elem >> 8) & 0xff;
770 ch_cmd[3] = elem & 0xff;
774 result = ch_do_scsi(ch, ch_cmd, 12,
775 buffer, 256, DMA_FROM_DEVICE);
777 cge.cge_status = buffer[18];
779 if (buffer[18] & CESTATUS_EXCEPT) {
782 if (buffer[25] & 0x80) {
783 cge.cge_flags |= CGE_SRC;
784 if (buffer[25] & 0x40)
785 cge.cge_flags |= CGE_INVERT;
786 elem = (buffer[26]<<8) | buffer[27];
787 for (i = 0; i < 4; i++) {
788 if (elem >= ch->firsts[i] &&
789 elem < ch->firsts[i] + ch->counts[i]) {
791 cge.cge_srcunit = elem-ch->firsts[i];
795 if ((buffer[22] & 0x30) == 0x30) {
796 cge.cge_flags |= CGE_IDLUN;
797 cge.cge_id = buffer[23];
798 cge.cge_lun = buffer[22] & 7;
800 if (buffer[9] & 0x80) {
801 cge.cge_flags |= CGE_PVOLTAG;
802 memcpy(cge.cge_pvoltag,buffer+28,36);
804 if (buffer[9] & 0x40) {
805 cge.cge_flags |= CGE_AVOLTAG;
806 memcpy(cge.cge_avoltag,buffer+64,36);
808 } else if (ch->voltags) {
810 VPRINTK(KERN_INFO, "device has no volume tag support\n");
814 mutex_unlock(&ch->lock);
816 if (copy_to_user(argp, &cge, sizeof (cge)))
823 mutex_lock(&ch->lock);
824 retval = ch_init_elem(ch);
825 mutex_unlock(&ch->lock);
831 struct changer_set_voltag csv;
834 if (copy_from_user(&csv, argp, sizeof(csv)))
837 if (0 != ch_checkrange(ch, csv.csv_type, csv.csv_unit)) {
838 DPRINTK("CHIOSVOLTAG: invalid parameter\n");
841 elem = ch->firsts[csv.csv_type] + csv.csv_unit;
842 mutex_lock(&ch->lock);
843 retval = ch_set_voltag(ch, elem,
844 csv.csv_flags & CSV_AVOLTAG,
845 csv.csv_flags & CSV_CLEARTAG,
847 mutex_unlock(&ch->lock);
852 return scsi_ioctl(ch->device, cmd, argp);
859 struct changer_element_status32 {
861 compat_uptr_t ces_data;
863 #define CHIOGSTATUS32 _IOW('c', 8,struct changer_element_status32)
865 static long ch_ioctl_compat(struct file * file,
866 unsigned int cmd, unsigned long arg)
868 scsi_changer *ch = file->private_data;
880 return ch_ioctl(file, cmd, arg);
883 struct changer_element_status32 ces32;
884 unsigned char __user *data;
886 if (copy_from_user(&ces32, (void __user *)arg, sizeof (ces32)))
888 if (ces32.ces_type < 0 || ces32.ces_type >= CH_TYPES)
891 data = compat_ptr(ces32.ces_data);
892 return ch_gstatus(ch, ces32.ces_type, data);
895 // return scsi_ioctl_compat(ch->device, cmd, (void*)arg);
902 /* ------------------------------------------------------------------------ */
904 static int ch_probe(struct device *dev)
906 struct scsi_device *sd = to_scsi_device(dev);
907 struct device *class_dev;
911 if (sd->type != TYPE_MEDIUM_CHANGER)
914 ch = kzalloc(sizeof(*ch), GFP_KERNEL);
918 idr_preload(GFP_KERNEL);
919 spin_lock(&ch_index_lock);
920 ret = idr_alloc(&ch_index_idr, ch, 0, CH_MAX_DEVS + 1, GFP_NOWAIT);
921 spin_unlock(&ch_index_lock);
931 sprintf(ch->name,"ch%d",ch->minor);
933 class_dev = device_create(ch_sysfs_class, dev,
934 MKDEV(SCSI_CHANGER_MAJOR, ch->minor), ch,
936 if (IS_ERR(class_dev)) {
937 sdev_printk(KERN_WARNING, sd, "ch%d: device_create failed\n",
939 ret = PTR_ERR(class_dev);
943 mutex_init(&ch->lock);
949 dev_set_drvdata(dev, ch);
950 sdev_printk(KERN_INFO, sd, "Attached scsi changer %s\n", ch->name);
954 idr_remove(&ch_index_idr, ch->minor);
960 static int ch_remove(struct device *dev)
962 scsi_changer *ch = dev_get_drvdata(dev);
964 spin_lock(&ch_index_lock);
965 idr_remove(&ch_index_idr, ch->minor);
966 spin_unlock(&ch_index_lock);
968 device_destroy(ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR,ch->minor));
974 static struct scsi_driver ch_template = {
977 .owner = THIS_MODULE,
983 static const struct file_operations changer_fops = {
984 .owner = THIS_MODULE,
986 .release = ch_release,
987 .unlocked_ioctl = ch_ioctl,
989 .compat_ioctl = ch_ioctl_compat,
991 .llseek = noop_llseek,
994 static int __init init_ch_module(void)
998 printk(KERN_INFO "SCSI Media Changer driver v" VERSION " \n");
999 ch_sysfs_class = class_create(THIS_MODULE, "scsi_changer");
1000 if (IS_ERR(ch_sysfs_class)) {
1001 rc = PTR_ERR(ch_sysfs_class);
1004 rc = register_chrdev(SCSI_CHANGER_MAJOR,"ch",&changer_fops);
1006 printk("Unable to get major %d for SCSI-Changer\n",
1007 SCSI_CHANGER_MAJOR);
1010 rc = scsi_register_driver(&ch_template.gendrv);
1016 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1018 class_destroy(ch_sysfs_class);
1022 static void __exit exit_ch_module(void)
1024 scsi_unregister_driver(&ch_template.gendrv);
1025 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1026 class_destroy(ch_sysfs_class);
1027 idr_destroy(&ch_index_idr);
1030 module_init(init_ch_module);
1031 module_exit(exit_ch_module);