2 * SCSI Media Changer device driver for Linux 2.6
4 * (c) 1996-2003 Gerd Knorr <kraxel@bytesex.org>
10 #include <linux/config.h>
11 #include <linux/module.h>
12 #include <linux/init.h>
14 #include <linux/kernel.h>
15 #include <linux/sched.h>
17 #include <linux/major.h>
18 #include <linux/string.h>
19 #include <linux/errno.h>
20 #include <linux/interrupt.h>
21 #include <linux/blkdev.h>
22 #include <linux/completion.h>
23 #include <linux/ioctl32.h>
24 #include <linux/compat.h>
25 #include <linux/chio.h> /* here are all the ioctls */
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_request.h>
34 #include <scsi/scsi_dbg.h>
39 MODULE_DESCRIPTION("device driver for scsi media changer devices");
40 MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org>");
41 MODULE_LICENSE("GPL");
44 module_param(init, int, 0444);
45 MODULE_PARM_DESC(init, \
46 "initialize element status on driver load (default: on)");
48 static int timeout_move = 300;
49 module_param(timeout_move, int, 0644);
50 MODULE_PARM_DESC(timeout_move,"timeout for move commands "
51 "(default: 300 seconds)");
53 static int timeout_init = 3600;
54 module_param(timeout_init, int, 0644);
55 MODULE_PARM_DESC(timeout_init,"timeout for INITIALIZE ELEMENT STATUS "
56 "(default: 3600 seconds)");
58 static int verbose = 1;
59 module_param(verbose, int, 0644);
60 MODULE_PARM_DESC(verbose,"be verbose (default: on)");
63 module_param(debug, int, 0644);
64 MODULE_PARM_DESC(debug,"enable/disable debug messages, also prints more "
65 "detailed sense codes on scsi errors (default: off)");
67 static int dt_id[CH_DT_MAX] = { [ 0 ... (CH_DT_MAX-1) ] = -1 };
68 static int dt_lun[CH_DT_MAX];
69 module_param_array(dt_id, int, NULL, 0444);
70 module_param_array(dt_lun, int, NULL, 0444);
72 /* tell the driver about vendor-specific slots */
73 static int vendor_firsts[CH_TYPES-4];
74 static int vendor_counts[CH_TYPES-4];
75 module_param_array(vendor_firsts, int, NULL, 0444);
76 module_param_array(vendor_counts, int, NULL, 0444);
78 static char *vendor_labels[CH_TYPES-4] = {
79 "v0", "v1", "v2", "v3"
81 // module_param_string_array(vendor_labels, NULL, 0444);
83 #define dprintk(fmt, arg...) if (debug) \
84 printk(KERN_DEBUG "%s: " fmt, ch->name , ## arg)
85 #define vprintk(fmt, arg...) if (verbose) \
86 printk(KERN_INFO "%s: " fmt, ch->name , ## arg)
88 /* ------------------------------------------------------------------- */
92 static int ch_probe(struct device *);
93 static int ch_remove(struct device *);
94 static int ch_open(struct inode * inode, struct file * filp);
95 static int ch_release(struct inode * inode, struct file * filp);
96 static int ch_ioctl(struct inode * inode, struct file * filp,
97 unsigned int cmd, unsigned long arg);
99 static long ch_ioctl_compat(struct file * filp,
100 unsigned int cmd, unsigned long arg);
103 static struct class * ch_sysfs_class;
106 struct list_head list;
109 struct scsi_device *device;
110 struct scsi_device **dt; /* ptrs to data transfer elements */
111 u_int firsts[CH_TYPES];
112 u_int counts[CH_TYPES];
113 u_int unit_attention;
115 struct semaphore lock;
118 static LIST_HEAD(ch_devlist);
119 static spinlock_t ch_devlist_lock = SPIN_LOCK_UNLOCKED;
120 static int ch_devcount;
122 static struct scsi_driver ch_template =
124 .owner = THIS_MODULE,
132 static struct file_operations changer_fops =
134 .owner = THIS_MODULE,
136 .release = ch_release,
139 .compat_ioctl = ch_ioctl_compat,
149 /* Just filled in what looks right. Hav'nt checked any standard paper for
150 these errno assignments, so they may be wrong... */
152 .sense = ILLEGAL_REQUEST,
155 .errno = EBADSLT, /* Invalid element address */
157 .sense = ILLEGAL_REQUEST,
160 .errno = EBADE, /* Import or export element accessed */
162 .sense = ILLEGAL_REQUEST,
165 .errno = EXFULL, /* Medium destination element full */
167 .sense = ILLEGAL_REQUEST,
170 .errno = EBADE, /* Medium source element empty */
172 .sense = ILLEGAL_REQUEST,
175 .errno = EBADRQC, /* Invalid command operation code */
181 /* ------------------------------------------------------------------- */
183 static int ch_find_errno(unsigned char *sense_buffer)
187 /* Check to see if additional sense information is available */
188 if (sense_buffer[7] > 5 &&
189 sense_buffer[12] != 0) {
190 for (i = 0; err[i].errno != 0; i++) {
191 if (err[i].sense == sense_buffer[ 2] &&
192 err[i].asc == sense_buffer[12] &&
193 err[i].ascq == sense_buffer[13]) {
194 errno = -err[i].errno;
205 ch_do_scsi(scsi_changer *ch, unsigned char *cmd,
206 void *buffer, unsigned buflength,
207 enum dma_data_direction direction)
209 int errno, retries = 0, timeout;
210 struct scsi_request *sr;
212 sr = scsi_allocate_request(ch->device, GFP_KERNEL);
216 timeout = (cmd[0] == INITIALIZE_ELEMENT_STATUS)
217 ? timeout_init : timeout_move;
222 dprintk("command: ");
223 __scsi_print_command(cmd);
226 scsi_wait_req(sr, cmd, buffer, buflength,
227 timeout * HZ, MAX_RETRIES);
229 dprintk("result: 0x%x\n",sr->sr_result);
230 if (driver_byte(sr->sr_result) & DRIVER_SENSE) {
232 scsi_print_req_sense(ch->name, sr);
233 errno = ch_find_errno(sr->sr_sense_buffer);
235 switch(sr->sr_sense_buffer[2] & 0xf) {
237 ch->unit_attention = 1;
243 scsi_release_request(sr);
247 /* ------------------------------------------------------------------------ */
250 ch_elem_to_typecode(scsi_changer *ch, u_int elem)
254 for (i = 0; i < CH_TYPES; i++) {
255 if (elem >= ch->firsts[i] &&
256 elem < ch->firsts[i] +
264 ch_read_element_status(scsi_changer *ch, u_int elem, char *data)
270 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
275 memset(cmd,0,sizeof(cmd));
276 cmd[0] = READ_ELEMENT_STATUS;
277 cmd[1] = (ch->device->lun << 5) |
278 (ch->voltags ? 0x10 : 0) |
279 ch_elem_to_typecode(ch,elem);
280 cmd[2] = (elem >> 8) & 0xff;
281 cmd[3] = elem & 0xff;
284 if (0 == (result = ch_do_scsi(ch, cmd, buffer, 256, DMA_FROM_DEVICE))) {
285 if (((buffer[16] << 8) | buffer[17]) != elem) {
286 dprintk("asked for element 0x%02x, got 0x%02x\n",
287 elem,(buffer[16] << 8) | buffer[17]);
291 memcpy(data,buffer+16,16);
295 vprintk("device has no volume tag support\n");
298 dprintk("READ ELEMENT STATUS for element 0x%x failed\n",elem);
305 ch_init_elem(scsi_changer *ch)
310 vprintk("INITIALIZE ELEMENT STATUS, may take some time ...\n");
311 memset(cmd,0,sizeof(cmd));
312 cmd[0] = INITIALIZE_ELEMENT_STATUS;
313 cmd[1] = ch->device->lun << 5;
314 err = ch_do_scsi(ch, cmd, NULL, 0, DMA_NONE);
315 vprintk("... finished\n");
320 ch_readconfig(scsi_changer *ch)
322 u_char cmd[10], data[16];
327 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
330 memset(buffer,0,512);
332 memset(cmd,0,sizeof(cmd));
334 cmd[1] = ch->device->lun << 5;
337 result = ch_do_scsi(ch, cmd, buffer, 255, DMA_FROM_DEVICE);
340 result = ch_do_scsi(ch, cmd, buffer, 255, DMA_FROM_DEVICE);
343 ch->firsts[CHET_MT] =
344 (buffer[buffer[3]+ 6] << 8) | buffer[buffer[3]+ 7];
345 ch->counts[CHET_MT] =
346 (buffer[buffer[3]+ 8] << 8) | buffer[buffer[3]+ 9];
347 ch->firsts[CHET_ST] =
348 (buffer[buffer[3]+10] << 8) | buffer[buffer[3]+11];
349 ch->counts[CHET_ST] =
350 (buffer[buffer[3]+12] << 8) | buffer[buffer[3]+13];
351 ch->firsts[CHET_IE] =
352 (buffer[buffer[3]+14] << 8) | buffer[buffer[3]+15];
353 ch->counts[CHET_IE] =
354 (buffer[buffer[3]+16] << 8) | buffer[buffer[3]+17];
355 ch->firsts[CHET_DT] =
356 (buffer[buffer[3]+18] << 8) | buffer[buffer[3]+19];
357 ch->counts[CHET_DT] =
358 (buffer[buffer[3]+20] << 8) | buffer[buffer[3]+21];
359 vprintk("type #1 (mt): 0x%x+%d [medium transport]\n",
361 ch->counts[CHET_MT]);
362 vprintk("type #2 (st): 0x%x+%d [storage]\n",
364 ch->counts[CHET_ST]);
365 vprintk("type #3 (ie): 0x%x+%d [import/export]\n",
367 ch->counts[CHET_IE]);
368 vprintk("type #4 (dt): 0x%x+%d [data transfer]\n",
370 ch->counts[CHET_DT]);
372 vprintk("reading element address assigment page failed!\n");
375 /* vendor specific element types */
376 for (i = 0; i < 4; i++) {
377 if (0 == vendor_counts[i])
379 if (NULL == vendor_labels[i])
381 ch->firsts[CHET_V1+i] = vendor_firsts[i];
382 ch->counts[CHET_V1+i] = vendor_counts[i];
383 vprintk("type #%d (v%d): 0x%x+%d [%s, vendor specific]\n",
384 i+5,i+1,vendor_firsts[i],vendor_counts[i],
388 /* look up the devices of the data transfer elements */
389 ch->dt = kmalloc(ch->counts[CHET_DT]*sizeof(struct scsi_device),
391 for (elem = 0; elem < ch->counts[CHET_DT]; elem++) {
394 if (elem < CH_DT_MAX && -1 != dt_id[elem]) {
397 vprintk("dt 0x%x: [insmod option] ",
398 elem+ch->firsts[CHET_DT]);
399 } else if (0 != ch_read_element_status
400 (ch,elem+ch->firsts[CHET_DT],data)) {
401 vprintk("dt 0x%x: READ ELEMENT STATUS failed\n",
402 elem+ch->firsts[CHET_DT]);
404 vprintk("dt 0x%x: ",elem+ch->firsts[CHET_DT]);
405 if (data[6] & 0x80) {
407 printk("not this SCSI bus\n");
409 } else if (0 == (data[6] & 0x30)) {
411 printk("ID/LUN unknown\n");
416 if (data[6] & 0x20) id = data[7];
417 if (data[6] & 0x10) lun = data[6] & 7;
422 printk("ID %i, LUN %i, ",id,lun);
424 scsi_device_lookup(ch->device->host,
428 /* should not happen */
430 printk("Huh? device not found!\n");
433 printk("name: %8.8s %16.16s %4.4s\n",
434 ch->dt[elem]->vendor,
446 /* ------------------------------------------------------------------------ */
449 ch_position(scsi_changer *ch, u_int trans, u_int elem, int rotate)
453 dprintk("position: 0x%x\n",elem);
455 trans = ch->firsts[CHET_MT];
456 memset(cmd,0,sizeof(cmd));
457 cmd[0] = POSITION_TO_ELEMENT;
458 cmd[1] = ch->device->lun << 5;
459 cmd[2] = (trans >> 8) & 0xff;
460 cmd[3] = trans & 0xff;
461 cmd[4] = (elem >> 8) & 0xff;
462 cmd[5] = elem & 0xff;
463 cmd[8] = rotate ? 1 : 0;
464 return ch_do_scsi(ch, cmd, NULL, 0, DMA_NONE);
468 ch_move(scsi_changer *ch, u_int trans, u_int src, u_int dest, int rotate)
472 dprintk("move: 0x%x => 0x%x\n",src,dest);
474 trans = ch->firsts[CHET_MT];
475 memset(cmd,0,sizeof(cmd));
476 cmd[0] = MOVE_MEDIUM;
477 cmd[1] = ch->device->lun << 5;
478 cmd[2] = (trans >> 8) & 0xff;
479 cmd[3] = trans & 0xff;
480 cmd[4] = (src >> 8) & 0xff;
482 cmd[6] = (dest >> 8) & 0xff;
483 cmd[7] = dest & 0xff;
484 cmd[10] = rotate ? 1 : 0;
485 return ch_do_scsi(ch, cmd, NULL,0, DMA_NONE);
489 ch_exchange(scsi_changer *ch, u_int trans, u_int src,
490 u_int dest1, u_int dest2, int rotate1, int rotate2)
494 dprintk("exchange: 0x%x => 0x%x => 0x%x\n",
497 trans = ch->firsts[CHET_MT];
498 memset(cmd,0,sizeof(cmd));
499 cmd[0] = EXCHANGE_MEDIUM;
500 cmd[1] = ch->device->lun << 5;
501 cmd[2] = (trans >> 8) & 0xff;
502 cmd[3] = trans & 0xff;
503 cmd[4] = (src >> 8) & 0xff;
505 cmd[6] = (dest1 >> 8) & 0xff;
506 cmd[7] = dest1 & 0xff;
507 cmd[8] = (dest2 >> 8) & 0xff;
508 cmd[9] = dest2 & 0xff;
509 cmd[10] = (rotate1 ? 1 : 0) | (rotate2 ? 2 : 0);
511 return ch_do_scsi(ch, cmd, NULL,0, DMA_NONE);
515 ch_check_voltag(char *tag)
519 for (i = 0; i < 32; i++) {
520 /* restrict to ascii */
521 if (tag[i] >= 0x7f || tag[i] < 0x20)
523 /* don't allow search wildcards */
531 ch_set_voltag(scsi_changer *ch, u_int elem,
532 int alternate, int clear, u_char *tag)
538 buffer = kmalloc(512, GFP_KERNEL);
541 memset(buffer,0,512);
543 dprintk("%s %s voltag: 0x%x => \"%s\"\n",
544 clear ? "clear" : "set",
545 alternate ? "alternate" : "primary",
547 memset(cmd,0,sizeof(cmd));
548 cmd[0] = SEND_VOLUME_TAG;
549 cmd[1] = (ch->device->lun << 5) |
550 ch_elem_to_typecode(ch,elem);
551 cmd[2] = (elem >> 8) & 0xff;
552 cmd[3] = elem & 0xff;
554 ? (alternate ? 0x0d : 0x0c)
555 : (alternate ? 0x0b : 0x0a);
559 memcpy(buffer,tag,32);
560 ch_check_voltag(buffer);
562 result = ch_do_scsi(ch, cmd, buffer, 256, DMA_TO_DEVICE);
567 static int ch_gstatus(scsi_changer *ch, int type, unsigned char *dest)
574 for (i = 0; i < ch->counts[type]; i++) {
575 if (0 != ch_read_element_status
576 (ch, ch->firsts[type]+i,data)) {
580 put_user(data[2], dest+i);
581 if (data[2] & CESTATUS_EXCEPT)
582 vprintk("element 0x%x: asc=0x%x, ascq=0x%x\n",
584 (int)data[4],(int)data[5]);
585 retval = ch_read_element_status
586 (ch, ch->firsts[type]+i,data);
594 /* ------------------------------------------------------------------------ */
597 ch_release(struct inode *inode, struct file *file)
599 scsi_changer *ch = file->private_data;
601 scsi_device_put(ch->device);
602 file->private_data = NULL;
607 ch_open(struct inode *inode, struct file *file)
609 scsi_changer *tmp, *ch;
610 int minor = iminor(inode);
612 spin_lock(&ch_devlist_lock);
614 list_for_each_entry(tmp,&ch_devlist,list) {
615 if (tmp->minor == minor)
618 if (NULL == ch || scsi_device_get(ch->device)) {
619 spin_unlock(&ch_devlist_lock);
622 spin_unlock(&ch_devlist_lock);
624 file->private_data = ch;
629 ch_checkrange(scsi_changer *ch, unsigned int type, unsigned int unit)
631 if (type >= CH_TYPES || unit >= ch->counts[type])
636 static int ch_ioctl(struct inode * inode, struct file * file,
637 unsigned int cmd, unsigned long arg)
639 scsi_changer *ch = file->private_data;
645 struct changer_params params;
647 params.cp_curpicker = 0;
648 params.cp_npickers = ch->counts[CHET_MT];
649 params.cp_nslots = ch->counts[CHET_ST];
650 params.cp_nportals = ch->counts[CHET_IE];
651 params.cp_ndrives = ch->counts[CHET_DT];
653 if (copy_to_user((void *) arg, ¶ms, sizeof(params)))
659 struct changer_vendor_params vparams;
661 memset(&vparams,0,sizeof(vparams));
662 if (ch->counts[CHET_V1]) {
663 vparams.cvp_n1 = ch->counts[CHET_V1];
664 strncpy(vparams.cvp_label1,vendor_labels[0],16);
666 if (ch->counts[CHET_V2]) {
667 vparams.cvp_n2 = ch->counts[CHET_V2];
668 strncpy(vparams.cvp_label2,vendor_labels[1],16);
670 if (ch->counts[CHET_V3]) {
671 vparams.cvp_n3 = ch->counts[CHET_V3];
672 strncpy(vparams.cvp_label3,vendor_labels[2],16);
674 if (ch->counts[CHET_V4]) {
675 vparams.cvp_n4 = ch->counts[CHET_V4];
676 strncpy(vparams.cvp_label4,vendor_labels[3],16);
678 if (copy_to_user((void *) arg, &vparams, sizeof(vparams)))
685 struct changer_position pos;
687 if (copy_from_user(&pos, (void*)arg, sizeof (pos)))
690 if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) {
691 dprintk("CHIOPOSITION: invalid parameter\n");
695 retval = ch_position(ch,0,
696 ch->firsts[pos.cp_type] + pos.cp_unit,
697 pos.cp_flags & CP_INVERT);
704 struct changer_move mv;
706 if (copy_from_user(&mv, (void*)arg, sizeof (mv)))
709 if (0 != ch_checkrange(ch, mv.cm_fromtype, mv.cm_fromunit) ||
710 0 != ch_checkrange(ch, mv.cm_totype, mv.cm_tounit )) {
711 dprintk("CHIOMOVE: invalid parameter\n");
716 retval = ch_move(ch,0,
717 ch->firsts[mv.cm_fromtype] + mv.cm_fromunit,
718 ch->firsts[mv.cm_totype] + mv.cm_tounit,
719 mv.cm_flags & CM_INVERT);
726 struct changer_exchange mv;
728 if (copy_from_user(&mv, (void*)arg, sizeof (mv)))
731 if (0 != ch_checkrange(ch, mv.ce_srctype, mv.ce_srcunit ) ||
732 0 != ch_checkrange(ch, mv.ce_fdsttype, mv.ce_fdstunit) ||
733 0 != ch_checkrange(ch, mv.ce_sdsttype, mv.ce_sdstunit)) {
734 dprintk("CHIOEXCHANGE: invalid parameter\n");
741 ch->firsts[mv.ce_srctype] + mv.ce_srcunit,
742 ch->firsts[mv.ce_fdsttype] + mv.ce_fdstunit,
743 ch->firsts[mv.ce_sdsttype] + mv.ce_sdstunit,
744 mv.ce_flags & CE_INVERT1, mv.ce_flags & CE_INVERT2);
751 struct changer_element_status ces;
753 if (copy_from_user(&ces, (void*)arg, sizeof (ces)))
755 if (ces.ces_type < 0 || ces.ces_type >= CH_TYPES)
758 return ch_gstatus(ch, ces.ces_type, ces.ces_data);
763 struct changer_get_element cge;
769 if (copy_from_user(&cge, (void*)arg, sizeof (cge)))
772 if (0 != ch_checkrange(ch, cge.cge_type, cge.cge_unit))
774 elem = ch->firsts[cge.cge_type] + cge.cge_unit;
776 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
782 memset(cmd,0,sizeof(cmd));
783 cmd[0] = READ_ELEMENT_STATUS;
784 cmd[1] = (ch->device->lun << 5) |
785 (ch->voltags ? 0x10 : 0) |
786 ch_elem_to_typecode(ch,elem);
787 cmd[2] = (elem >> 8) & 0xff;
788 cmd[3] = elem & 0xff;
792 if (0 == (result = ch_do_scsi(ch, cmd, buffer, 256, DMA_FROM_DEVICE))) {
793 cge.cge_status = buffer[18];
795 if (buffer[18] & CESTATUS_EXCEPT) {
798 if (buffer[25] & 0x80) {
799 cge.cge_flags |= CGE_SRC;
800 if (buffer[25] & 0x40)
801 cge.cge_flags |= CGE_INVERT;
802 elem = (buffer[26]<<8) | buffer[27];
803 for (i = 0; i < 4; i++) {
804 if (elem >= ch->firsts[i] &&
805 elem < ch->firsts[i] + ch->counts[i]) {
807 cge.cge_srcunit = elem-ch->firsts[i];
811 if ((buffer[22] & 0x30) == 0x30) {
812 cge.cge_flags |= CGE_IDLUN;
813 cge.cge_id = buffer[23];
814 cge.cge_lun = buffer[22] & 7;
816 if (buffer[9] & 0x80) {
817 cge.cge_flags |= CGE_PVOLTAG;
818 memcpy(cge.cge_pvoltag,buffer+28,36);
820 if (buffer[9] & 0x40) {
821 cge.cge_flags |= CGE_AVOLTAG;
822 memcpy(cge.cge_avoltag,buffer+64,36);
824 } else if (ch->voltags) {
826 vprintk("device has no volume tag support\n");
832 if (copy_to_user((void*)arg, &cge, sizeof (cge)))
840 retval = ch_init_elem(ch);
847 struct changer_set_voltag csv;
850 if (copy_from_user(&csv, (void*)arg, sizeof(csv)))
853 if (0 != ch_checkrange(ch, csv.csv_type, csv.csv_unit)) {
854 dprintk("CHIOSVOLTAG: invalid parameter\n");
857 elem = ch->firsts[csv.csv_type] + csv.csv_unit;
859 retval = ch_set_voltag(ch, elem,
860 csv.csv_flags & CSV_AVOLTAG,
861 csv.csv_flags & CSV_CLEARTAG,
868 return scsi_ioctl(ch->device, cmd, (void*)arg);
875 struct changer_element_status32 {
877 compat_uptr_t ces_data;
879 #define CHIOGSTATUS32 _IOW('c', 8,struct changer_element_status32)
881 static long ch_ioctl_compat(struct file * file,
882 unsigned int cmd, unsigned long arg)
884 scsi_changer *ch = file->private_data;
896 return ch_ioctl(NULL /* inode, unused */,
900 struct changer_element_status32 ces32;
903 if (copy_from_user(&ces32, (void*)arg, sizeof (ces32)))
905 if (ces32.ces_type < 0 || ces32.ces_type >= CH_TYPES)
908 data = compat_ptr(ces32.ces_data);
909 return ch_gstatus(ch, ces32.ces_type, data);
912 // return scsi_ioctl_compat(ch->device, cmd, (void*)arg);
919 /* ------------------------------------------------------------------------ */
921 static int ch_probe(struct device *dev)
923 struct scsi_device *sd = to_scsi_device(dev);
926 if (sd->type != TYPE_MEDIUM_CHANGER)
929 ch = kmalloc(sizeof(*ch), GFP_KERNEL);
933 memset(ch,0,sizeof(*ch));
934 ch->minor = ch_devcount;
935 sprintf(ch->name,"ch%d",ch->minor);
936 init_MUTEX(&ch->lock);
942 class_device_create(ch_sysfs_class,
943 MKDEV(SCSI_CHANGER_MAJOR,ch->minor),
944 dev, "s%s", ch->name);
946 printk(KERN_INFO "Attached scsi changer %s "
947 "at scsi%d, channel %d, id %d, lun %d\n",
948 ch->name, sd->host->host_no, sd->channel, sd->id, sd->lun);
950 spin_lock(&ch_devlist_lock);
951 list_add_tail(&ch->list,&ch_devlist);
953 spin_unlock(&ch_devlist_lock);
957 static int ch_remove(struct device *dev)
959 struct scsi_device *sd = to_scsi_device(dev);
960 scsi_changer *tmp, *ch;
962 spin_lock(&ch_devlist_lock);
964 list_for_each_entry(tmp,&ch_devlist,list) {
965 if (tmp->device == sd)
970 spin_unlock(&ch_devlist_lock);
972 class_device_destroy(ch_sysfs_class,
973 MKDEV(SCSI_CHANGER_MAJOR,ch->minor));
980 static int __init init_ch_module(void)
984 printk(KERN_INFO "SCSI Media Changer driver v" VERSION " \n");
985 ch_sysfs_class = class_create(THIS_MODULE, "scsi_changer");
986 if (IS_ERR(ch_sysfs_class)) {
987 rc = PTR_ERR(ch_sysfs_class);
990 rc = register_chrdev(SCSI_CHANGER_MAJOR,"ch",&changer_fops);
992 printk("Unable to get major %d for SCSI-Changer\n",
996 rc = scsi_register_driver(&ch_template.gendrv);
1002 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1004 class_destroy(ch_sysfs_class);
1008 static void __exit exit_ch_module(void)
1010 scsi_unregister_driver(&ch_template.gendrv);
1011 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1012 class_destroy(ch_sysfs_class);
1015 module_init(init_ch_module);
1016 module_exit(exit_ch_module);