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/smp_lock.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);
47 module_param(init, int, 0444);
48 MODULE_PARM_DESC(init, \
49 "initialize element status on driver load (default: on)");
51 static int timeout_move = 300;
52 module_param(timeout_move, int, 0644);
53 MODULE_PARM_DESC(timeout_move,"timeout for move commands "
54 "(default: 300 seconds)");
56 static int timeout_init = 3600;
57 module_param(timeout_init, int, 0644);
58 MODULE_PARM_DESC(timeout_init,"timeout for INITIALIZE ELEMENT STATUS "
59 "(default: 3600 seconds)");
61 static int verbose = 1;
62 module_param(verbose, int, 0644);
63 MODULE_PARM_DESC(verbose,"be verbose (default: on)");
66 module_param(debug, int, 0644);
67 MODULE_PARM_DESC(debug,"enable/disable debug messages, also prints more "
68 "detailed sense codes on scsi errors (default: off)");
70 static int dt_id[CH_DT_MAX] = { [ 0 ... (CH_DT_MAX-1) ] = -1 };
71 static int dt_lun[CH_DT_MAX];
72 module_param_array(dt_id, int, NULL, 0444);
73 module_param_array(dt_lun, int, NULL, 0444);
75 /* tell the driver about vendor-specific slots */
76 static int vendor_firsts[CH_TYPES-4];
77 static int vendor_counts[CH_TYPES-4];
78 module_param_array(vendor_firsts, int, NULL, 0444);
79 module_param_array(vendor_counts, int, NULL, 0444);
81 static const char * vendor_labels[CH_TYPES-4] = {
82 "v0", "v1", "v2", "v3"
84 // module_param_string_array(vendor_labels, NULL, 0444);
86 #define dprintk(fmt, arg...) if (debug) \
87 printk(KERN_DEBUG "%s: " fmt, ch->name , ## arg)
88 #define vprintk(fmt, arg...) if (verbose) \
89 printk(KERN_INFO "%s: " fmt, ch->name , ## arg)
91 /* ------------------------------------------------------------------- */
95 static struct class * ch_sysfs_class;
98 struct list_head list;
101 struct scsi_device *device;
102 struct scsi_device **dt; /* ptrs to data transfer elements */
103 u_int firsts[CH_TYPES];
104 u_int counts[CH_TYPES];
105 u_int unit_attention;
110 static DEFINE_IDR(ch_index_idr);
111 static DEFINE_SPINLOCK(ch_index_lock);
113 static const struct {
119 /* Just filled in what looks right. Hav'nt checked any standard paper for
120 these errno assignments, so they may be wrong... */
122 .sense = ILLEGAL_REQUEST,
125 .errno = EBADSLT, /* Invalid element address */
127 .sense = ILLEGAL_REQUEST,
130 .errno = EBADE, /* Import or export element accessed */
132 .sense = ILLEGAL_REQUEST,
135 .errno = EXFULL, /* Medium destination element full */
137 .sense = ILLEGAL_REQUEST,
140 .errno = EBADE, /* Medium source element empty */
142 .sense = ILLEGAL_REQUEST,
145 .errno = EBADRQC, /* Invalid command operation code */
151 /* ------------------------------------------------------------------- */
153 static int ch_find_errno(struct scsi_sense_hdr *sshdr)
157 /* Check to see if additional sense information is available */
158 if (scsi_sense_valid(sshdr) &&
160 for (i = 0; ch_err[i].errno != 0; i++) {
161 if (ch_err[i].sense == sshdr->sense_key &&
162 ch_err[i].asc == sshdr->asc &&
163 ch_err[i].ascq == sshdr->ascq) {
164 errno = -ch_err[i].errno;
175 ch_do_scsi(scsi_changer *ch, unsigned char *cmd,
176 void *buffer, unsigned buflength,
177 enum dma_data_direction direction)
179 int errno, retries = 0, timeout, result;
180 struct scsi_sense_hdr sshdr;
182 timeout = (cmd[0] == INITIALIZE_ELEMENT_STATUS)
183 ? timeout_init : timeout_move;
188 dprintk("command: ");
189 __scsi_print_command(cmd);
192 result = scsi_execute_req(ch->device, cmd, direction, buffer,
193 buflength, &sshdr, timeout * HZ,
196 dprintk("result: 0x%x\n",result);
197 if (driver_byte(result) & DRIVER_SENSE) {
199 scsi_print_sense_hdr(ch->name, &sshdr);
200 errno = ch_find_errno(&sshdr);
202 switch(sshdr.sense_key) {
204 ch->unit_attention = 1;
213 /* ------------------------------------------------------------------------ */
216 ch_elem_to_typecode(scsi_changer *ch, u_int elem)
220 for (i = 0; i < CH_TYPES; i++) {
221 if (elem >= ch->firsts[i] &&
222 elem < ch->firsts[i] +
230 ch_read_element_status(scsi_changer *ch, u_int elem, char *data)
236 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
241 memset(cmd,0,sizeof(cmd));
242 cmd[0] = READ_ELEMENT_STATUS;
243 cmd[1] = (ch->device->lun << 5) |
244 (ch->voltags ? 0x10 : 0) |
245 ch_elem_to_typecode(ch,elem);
246 cmd[2] = (elem >> 8) & 0xff;
247 cmd[3] = elem & 0xff;
250 if (0 == (result = ch_do_scsi(ch, cmd, buffer, 256, DMA_FROM_DEVICE))) {
251 if (((buffer[16] << 8) | buffer[17]) != elem) {
252 dprintk("asked for element 0x%02x, got 0x%02x\n",
253 elem,(buffer[16] << 8) | buffer[17]);
257 memcpy(data,buffer+16,16);
261 vprintk("device has no volume tag support\n");
264 dprintk("READ ELEMENT STATUS for element 0x%x failed\n",elem);
271 ch_init_elem(scsi_changer *ch)
276 vprintk("INITIALIZE ELEMENT STATUS, may take some time ...\n");
277 memset(cmd,0,sizeof(cmd));
278 cmd[0] = INITIALIZE_ELEMENT_STATUS;
279 cmd[1] = ch->device->lun << 5;
280 err = ch_do_scsi(ch, cmd, NULL, 0, DMA_NONE);
281 vprintk("... finished\n");
286 ch_readconfig(scsi_changer *ch)
288 u_char cmd[10], data[16];
293 buffer = kzalloc(512, GFP_KERNEL | GFP_DMA);
297 memset(cmd,0,sizeof(cmd));
299 cmd[1] = ch->device->lun << 5;
302 result = ch_do_scsi(ch, cmd, buffer, 255, DMA_FROM_DEVICE);
305 result = ch_do_scsi(ch, cmd, buffer, 255, DMA_FROM_DEVICE);
308 ch->firsts[CHET_MT] =
309 (buffer[buffer[3]+ 6] << 8) | buffer[buffer[3]+ 7];
310 ch->counts[CHET_MT] =
311 (buffer[buffer[3]+ 8] << 8) | buffer[buffer[3]+ 9];
312 ch->firsts[CHET_ST] =
313 (buffer[buffer[3]+10] << 8) | buffer[buffer[3]+11];
314 ch->counts[CHET_ST] =
315 (buffer[buffer[3]+12] << 8) | buffer[buffer[3]+13];
316 ch->firsts[CHET_IE] =
317 (buffer[buffer[3]+14] << 8) | buffer[buffer[3]+15];
318 ch->counts[CHET_IE] =
319 (buffer[buffer[3]+16] << 8) | buffer[buffer[3]+17];
320 ch->firsts[CHET_DT] =
321 (buffer[buffer[3]+18] << 8) | buffer[buffer[3]+19];
322 ch->counts[CHET_DT] =
323 (buffer[buffer[3]+20] << 8) | buffer[buffer[3]+21];
324 vprintk("type #1 (mt): 0x%x+%d [medium transport]\n",
326 ch->counts[CHET_MT]);
327 vprintk("type #2 (st): 0x%x+%d [storage]\n",
329 ch->counts[CHET_ST]);
330 vprintk("type #3 (ie): 0x%x+%d [import/export]\n",
332 ch->counts[CHET_IE]);
333 vprintk("type #4 (dt): 0x%x+%d [data transfer]\n",
335 ch->counts[CHET_DT]);
337 vprintk("reading element address assigment page failed!\n");
340 /* vendor specific element types */
341 for (i = 0; i < 4; i++) {
342 if (0 == vendor_counts[i])
344 if (NULL == vendor_labels[i])
346 ch->firsts[CHET_V1+i] = vendor_firsts[i];
347 ch->counts[CHET_V1+i] = vendor_counts[i];
348 vprintk("type #%d (v%d): 0x%x+%d [%s, vendor specific]\n",
349 i+5,i+1,vendor_firsts[i],vendor_counts[i],
353 /* look up the devices of the data transfer elements */
354 ch->dt = kmalloc(ch->counts[CHET_DT]*sizeof(struct scsi_device),
362 for (elem = 0; elem < ch->counts[CHET_DT]; elem++) {
365 if (elem < CH_DT_MAX && -1 != dt_id[elem]) {
368 vprintk("dt 0x%x: [insmod option] ",
369 elem+ch->firsts[CHET_DT]);
370 } else if (0 != ch_read_element_status
371 (ch,elem+ch->firsts[CHET_DT],data)) {
372 vprintk("dt 0x%x: READ ELEMENT STATUS failed\n",
373 elem+ch->firsts[CHET_DT]);
375 vprintk("dt 0x%x: ",elem+ch->firsts[CHET_DT]);
376 if (data[6] & 0x80) {
378 printk("not this SCSI bus\n");
380 } else if (0 == (data[6] & 0x30)) {
382 printk("ID/LUN unknown\n");
387 if (data[6] & 0x20) id = data[7];
388 if (data[6] & 0x10) lun = data[6] & 7;
393 printk("ID %i, LUN %i, ",id,lun);
395 scsi_device_lookup(ch->device->host,
399 /* should not happen */
401 printk("Huh? device not found!\n");
404 printk("name: %8.8s %16.16s %4.4s\n",
405 ch->dt[elem]->vendor,
417 /* ------------------------------------------------------------------------ */
420 ch_position(scsi_changer *ch, u_int trans, u_int elem, int rotate)
424 dprintk("position: 0x%x\n",elem);
426 trans = ch->firsts[CHET_MT];
427 memset(cmd,0,sizeof(cmd));
428 cmd[0] = POSITION_TO_ELEMENT;
429 cmd[1] = ch->device->lun << 5;
430 cmd[2] = (trans >> 8) & 0xff;
431 cmd[3] = trans & 0xff;
432 cmd[4] = (elem >> 8) & 0xff;
433 cmd[5] = elem & 0xff;
434 cmd[8] = rotate ? 1 : 0;
435 return ch_do_scsi(ch, cmd, NULL, 0, DMA_NONE);
439 ch_move(scsi_changer *ch, u_int trans, u_int src, u_int dest, int rotate)
443 dprintk("move: 0x%x => 0x%x\n",src,dest);
445 trans = ch->firsts[CHET_MT];
446 memset(cmd,0,sizeof(cmd));
447 cmd[0] = MOVE_MEDIUM;
448 cmd[1] = ch->device->lun << 5;
449 cmd[2] = (trans >> 8) & 0xff;
450 cmd[3] = trans & 0xff;
451 cmd[4] = (src >> 8) & 0xff;
453 cmd[6] = (dest >> 8) & 0xff;
454 cmd[7] = dest & 0xff;
455 cmd[10] = rotate ? 1 : 0;
456 return ch_do_scsi(ch, cmd, NULL,0, DMA_NONE);
460 ch_exchange(scsi_changer *ch, u_int trans, u_int src,
461 u_int dest1, u_int dest2, int rotate1, int rotate2)
465 dprintk("exchange: 0x%x => 0x%x => 0x%x\n",
468 trans = ch->firsts[CHET_MT];
469 memset(cmd,0,sizeof(cmd));
470 cmd[0] = EXCHANGE_MEDIUM;
471 cmd[1] = ch->device->lun << 5;
472 cmd[2] = (trans >> 8) & 0xff;
473 cmd[3] = trans & 0xff;
474 cmd[4] = (src >> 8) & 0xff;
476 cmd[6] = (dest1 >> 8) & 0xff;
477 cmd[7] = dest1 & 0xff;
478 cmd[8] = (dest2 >> 8) & 0xff;
479 cmd[9] = dest2 & 0xff;
480 cmd[10] = (rotate1 ? 1 : 0) | (rotate2 ? 2 : 0);
482 return ch_do_scsi(ch, cmd, NULL,0, DMA_NONE);
486 ch_check_voltag(char *tag)
490 for (i = 0; i < 32; i++) {
491 /* restrict to ascii */
492 if (tag[i] >= 0x7f || tag[i] < 0x20)
494 /* don't allow search wildcards */
502 ch_set_voltag(scsi_changer *ch, u_int elem,
503 int alternate, int clear, u_char *tag)
509 buffer = kzalloc(512, GFP_KERNEL);
513 dprintk("%s %s voltag: 0x%x => \"%s\"\n",
514 clear ? "clear" : "set",
515 alternate ? "alternate" : "primary",
517 memset(cmd,0,sizeof(cmd));
518 cmd[0] = SEND_VOLUME_TAG;
519 cmd[1] = (ch->device->lun << 5) |
520 ch_elem_to_typecode(ch,elem);
521 cmd[2] = (elem >> 8) & 0xff;
522 cmd[3] = elem & 0xff;
524 ? (alternate ? 0x0d : 0x0c)
525 : (alternate ? 0x0b : 0x0a);
529 memcpy(buffer,tag,32);
530 ch_check_voltag(buffer);
532 result = ch_do_scsi(ch, cmd, buffer, 256, DMA_TO_DEVICE);
537 static int ch_gstatus(scsi_changer *ch, int type, unsigned char __user *dest)
543 mutex_lock(&ch->lock);
544 for (i = 0; i < ch->counts[type]; i++) {
545 if (0 != ch_read_element_status
546 (ch, ch->firsts[type]+i,data)) {
550 put_user(data[2], dest+i);
551 if (data[2] & CESTATUS_EXCEPT)
552 vprintk("element 0x%x: asc=0x%x, ascq=0x%x\n",
554 (int)data[4],(int)data[5]);
555 retval = ch_read_element_status
556 (ch, ch->firsts[type]+i,data);
560 mutex_unlock(&ch->lock);
564 /* ------------------------------------------------------------------------ */
567 ch_release(struct inode *inode, struct file *file)
569 scsi_changer *ch = file->private_data;
571 scsi_device_put(ch->device);
572 file->private_data = NULL;
577 ch_open(struct inode *inode, struct file *file)
580 int minor = iminor(inode);
583 spin_lock(&ch_index_lock);
584 ch = idr_find(&ch_index_idr, minor);
586 if (NULL == ch || scsi_device_get(ch->device)) {
587 spin_unlock(&ch_index_lock);
591 spin_unlock(&ch_index_lock);
593 file->private_data = ch;
599 ch_checkrange(scsi_changer *ch, unsigned int type, unsigned int unit)
601 if (type >= CH_TYPES || unit >= ch->counts[type])
606 static long ch_ioctl(struct file *file,
607 unsigned int cmd, unsigned long arg)
609 scsi_changer *ch = file->private_data;
611 void __user *argp = (void __user *)arg;
616 struct changer_params params;
618 params.cp_curpicker = 0;
619 params.cp_npickers = ch->counts[CHET_MT];
620 params.cp_nslots = ch->counts[CHET_ST];
621 params.cp_nportals = ch->counts[CHET_IE];
622 params.cp_ndrives = ch->counts[CHET_DT];
624 if (copy_to_user(argp, ¶ms, sizeof(params)))
630 struct changer_vendor_params vparams;
632 memset(&vparams,0,sizeof(vparams));
633 if (ch->counts[CHET_V1]) {
634 vparams.cvp_n1 = ch->counts[CHET_V1];
635 strncpy(vparams.cvp_label1,vendor_labels[0],16);
637 if (ch->counts[CHET_V2]) {
638 vparams.cvp_n2 = ch->counts[CHET_V2];
639 strncpy(vparams.cvp_label2,vendor_labels[1],16);
641 if (ch->counts[CHET_V3]) {
642 vparams.cvp_n3 = ch->counts[CHET_V3];
643 strncpy(vparams.cvp_label3,vendor_labels[2],16);
645 if (ch->counts[CHET_V4]) {
646 vparams.cvp_n4 = ch->counts[CHET_V4];
647 strncpy(vparams.cvp_label4,vendor_labels[3],16);
649 if (copy_to_user(argp, &vparams, sizeof(vparams)))
656 struct changer_position pos;
658 if (copy_from_user(&pos, argp, sizeof (pos)))
661 if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) {
662 dprintk("CHIOPOSITION: invalid parameter\n");
665 mutex_lock(&ch->lock);
666 retval = ch_position(ch,0,
667 ch->firsts[pos.cp_type] + pos.cp_unit,
668 pos.cp_flags & CP_INVERT);
669 mutex_unlock(&ch->lock);
675 struct changer_move mv;
677 if (copy_from_user(&mv, argp, sizeof (mv)))
680 if (0 != ch_checkrange(ch, mv.cm_fromtype, mv.cm_fromunit) ||
681 0 != ch_checkrange(ch, mv.cm_totype, mv.cm_tounit )) {
682 dprintk("CHIOMOVE: invalid parameter\n");
686 mutex_lock(&ch->lock);
687 retval = ch_move(ch,0,
688 ch->firsts[mv.cm_fromtype] + mv.cm_fromunit,
689 ch->firsts[mv.cm_totype] + mv.cm_tounit,
690 mv.cm_flags & CM_INVERT);
691 mutex_unlock(&ch->lock);
697 struct changer_exchange mv;
699 if (copy_from_user(&mv, argp, sizeof (mv)))
702 if (0 != ch_checkrange(ch, mv.ce_srctype, mv.ce_srcunit ) ||
703 0 != ch_checkrange(ch, mv.ce_fdsttype, mv.ce_fdstunit) ||
704 0 != ch_checkrange(ch, mv.ce_sdsttype, mv.ce_sdstunit)) {
705 dprintk("CHIOEXCHANGE: invalid parameter\n");
709 mutex_lock(&ch->lock);
712 ch->firsts[mv.ce_srctype] + mv.ce_srcunit,
713 ch->firsts[mv.ce_fdsttype] + mv.ce_fdstunit,
714 ch->firsts[mv.ce_sdsttype] + mv.ce_sdstunit,
715 mv.ce_flags & CE_INVERT1, mv.ce_flags & CE_INVERT2);
716 mutex_unlock(&ch->lock);
722 struct changer_element_status ces;
724 if (copy_from_user(&ces, argp, sizeof (ces)))
726 if (ces.ces_type < 0 || ces.ces_type >= CH_TYPES)
729 return ch_gstatus(ch, ces.ces_type, ces.ces_data);
734 struct changer_get_element cge;
740 if (copy_from_user(&cge, argp, sizeof (cge)))
743 if (0 != ch_checkrange(ch, cge.cge_type, cge.cge_unit))
745 elem = ch->firsts[cge.cge_type] + cge.cge_unit;
747 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
750 mutex_lock(&ch->lock);
753 memset(ch_cmd, 0, sizeof(ch_cmd));
754 ch_cmd[0] = READ_ELEMENT_STATUS;
755 ch_cmd[1] = (ch->device->lun << 5) |
756 (ch->voltags ? 0x10 : 0) |
757 ch_elem_to_typecode(ch,elem);
758 ch_cmd[2] = (elem >> 8) & 0xff;
759 ch_cmd[3] = elem & 0xff;
763 result = ch_do_scsi(ch, ch_cmd, buffer, 256, DMA_FROM_DEVICE);
765 cge.cge_status = buffer[18];
767 if (buffer[18] & CESTATUS_EXCEPT) {
770 if (buffer[25] & 0x80) {
771 cge.cge_flags |= CGE_SRC;
772 if (buffer[25] & 0x40)
773 cge.cge_flags |= CGE_INVERT;
774 elem = (buffer[26]<<8) | buffer[27];
775 for (i = 0; i < 4; i++) {
776 if (elem >= ch->firsts[i] &&
777 elem < ch->firsts[i] + ch->counts[i]) {
779 cge.cge_srcunit = elem-ch->firsts[i];
783 if ((buffer[22] & 0x30) == 0x30) {
784 cge.cge_flags |= CGE_IDLUN;
785 cge.cge_id = buffer[23];
786 cge.cge_lun = buffer[22] & 7;
788 if (buffer[9] & 0x80) {
789 cge.cge_flags |= CGE_PVOLTAG;
790 memcpy(cge.cge_pvoltag,buffer+28,36);
792 if (buffer[9] & 0x40) {
793 cge.cge_flags |= CGE_AVOLTAG;
794 memcpy(cge.cge_avoltag,buffer+64,36);
796 } else if (ch->voltags) {
798 vprintk("device has no volume tag support\n");
802 mutex_unlock(&ch->lock);
804 if (copy_to_user(argp, &cge, sizeof (cge)))
811 mutex_lock(&ch->lock);
812 retval = ch_init_elem(ch);
813 mutex_unlock(&ch->lock);
819 struct changer_set_voltag csv;
822 if (copy_from_user(&csv, argp, sizeof(csv)))
825 if (0 != ch_checkrange(ch, csv.csv_type, csv.csv_unit)) {
826 dprintk("CHIOSVOLTAG: invalid parameter\n");
829 elem = ch->firsts[csv.csv_type] + csv.csv_unit;
830 mutex_lock(&ch->lock);
831 retval = ch_set_voltag(ch, elem,
832 csv.csv_flags & CSV_AVOLTAG,
833 csv.csv_flags & CSV_CLEARTAG,
835 mutex_unlock(&ch->lock);
840 return scsi_ioctl(ch->device, cmd, argp);
847 struct changer_element_status32 {
849 compat_uptr_t ces_data;
851 #define CHIOGSTATUS32 _IOW('c', 8,struct changer_element_status32)
853 static long ch_ioctl_compat(struct file * file,
854 unsigned int cmd, unsigned long arg)
856 scsi_changer *ch = file->private_data;
868 return ch_ioctl(file, cmd, arg);
871 struct changer_element_status32 ces32;
872 unsigned char __user *data;
874 if (copy_from_user(&ces32, (void __user *)arg, sizeof (ces32)))
876 if (ces32.ces_type < 0 || ces32.ces_type >= CH_TYPES)
879 data = compat_ptr(ces32.ces_data);
880 return ch_gstatus(ch, ces32.ces_type, data);
883 // return scsi_ioctl_compat(ch->device, cmd, (void*)arg);
890 /* ------------------------------------------------------------------------ */
892 static int ch_probe(struct device *dev)
894 struct scsi_device *sd = to_scsi_device(dev);
895 struct device *class_dev;
896 int minor, ret = -ENOMEM;
899 if (sd->type != TYPE_MEDIUM_CHANGER)
902 ch = kzalloc(sizeof(*ch), GFP_KERNEL);
906 if (!idr_pre_get(&ch_index_idr, GFP_KERNEL))
909 spin_lock(&ch_index_lock);
910 ret = idr_get_new(&ch_index_idr, ch, &minor);
911 spin_unlock(&ch_index_lock);
916 if (minor > CH_MAX_DEVS) {
922 sprintf(ch->name,"ch%d",ch->minor);
924 class_dev = device_create(ch_sysfs_class, dev,
925 MKDEV(SCSI_CHANGER_MAJOR, ch->minor), ch,
927 if (IS_ERR(class_dev)) {
928 printk(KERN_WARNING "ch%d: device_create failed\n",
930 ret = PTR_ERR(class_dev);
934 mutex_init(&ch->lock);
940 dev_set_drvdata(dev, ch);
941 sdev_printk(KERN_INFO, sd, "Attached scsi changer %s\n", ch->name);
945 idr_remove(&ch_index_idr, minor);
951 static int ch_remove(struct device *dev)
953 scsi_changer *ch = dev_get_drvdata(dev);
955 spin_lock(&ch_index_lock);
956 idr_remove(&ch_index_idr, ch->minor);
957 spin_unlock(&ch_index_lock);
959 device_destroy(ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR,ch->minor));
965 static struct scsi_driver ch_template = {
966 .owner = THIS_MODULE,
974 static const struct file_operations changer_fops = {
975 .owner = THIS_MODULE,
977 .release = ch_release,
978 .unlocked_ioctl = ch_ioctl,
980 .compat_ioctl = ch_ioctl_compat,
984 static int __init init_ch_module(void)
988 printk(KERN_INFO "SCSI Media Changer driver v" VERSION " \n");
989 ch_sysfs_class = class_create(THIS_MODULE, "scsi_changer");
990 if (IS_ERR(ch_sysfs_class)) {
991 rc = PTR_ERR(ch_sysfs_class);
994 rc = register_chrdev(SCSI_CHANGER_MAJOR,"ch",&changer_fops);
996 printk("Unable to get major %d for SCSI-Changer\n",
1000 rc = scsi_register_driver(&ch_template.gendrv);
1006 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1008 class_destroy(ch_sysfs_class);
1012 static void __exit exit_ch_module(void)
1014 scsi_unregister_driver(&ch_template.gendrv);
1015 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1016 class_destroy(ch_sysfs_class);
1017 idr_destroy(&ch_index_idr);
1020 module_init(init_ch_module);
1021 module_exit(exit_ch_module);