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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * SCSI Media Changer device driver for Linux 2.64 *5 * (c) 1996-2003 Gerd Knorr <kraxel@bytesex.org>6 *7 */8 9#define VERSION "0.25"10 11#include <linux/module.h>12#include <linux/init.h>13#include <linux/fs.h>14#include <linux/kernel.h>15#include <linux/mm.h>16#include <linux/major.h>17#include <linux/string.h>18#include <linux/errno.h>19#include <linux/interrupt.h>20#include <linux/blkdev.h>21#include <linux/completion.h>22#include <linux/compat.h>23#include <linux/chio.h> /* here are all the ioctls */24#include <linux/mutex.h>25#include <linux/idr.h>26#include <linux/slab.h>27 28#include <scsi/scsi.h>29#include <scsi/scsi_cmnd.h>30#include <scsi/scsi_driver.h>31#include <scsi/scsi_ioctl.h>32#include <scsi/scsi_host.h>33#include <scsi/scsi_device.h>34#include <scsi/scsi_eh.h>35#include <scsi/scsi_dbg.h>36 37#define CH_DT_MAX 1638#define CH_TYPES 839#define CH_MAX_DEVS 12840 41MODULE_DESCRIPTION("device driver for scsi media changer devices");42MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org>");43MODULE_LICENSE("GPL");44MODULE_ALIAS_CHARDEV_MAJOR(SCSI_CHANGER_MAJOR);45MODULE_ALIAS_SCSI_DEVICE(TYPE_MEDIUM_CHANGER);46 47static int init = 1;48module_param(init, int, 0444);49MODULE_PARM_DESC(init, \50 "initialize element status on driver load (default: on)");51 52static int timeout_move = 300;53module_param(timeout_move, int, 0644);54MODULE_PARM_DESC(timeout_move,"timeout for move commands "55 "(default: 300 seconds)");56 57static int timeout_init = 3600;58module_param(timeout_init, int, 0644);59MODULE_PARM_DESC(timeout_init,"timeout for INITIALIZE ELEMENT STATUS "60 "(default: 3600 seconds)");61 62static int verbose = 1;63module_param(verbose, int, 0644);64MODULE_PARM_DESC(verbose,"be verbose (default: on)");65 66static int debug;67module_param(debug, int, 0644);68MODULE_PARM_DESC(debug,"enable/disable debug messages, also prints more "69 "detailed sense codes on scsi errors (default: off)");70 71static int dt_id[CH_DT_MAX] = { [ 0 ... (CH_DT_MAX-1) ] = -1 };72static int dt_lun[CH_DT_MAX];73module_param_array(dt_id, int, NULL, 0444);74module_param_array(dt_lun, int, NULL, 0444);75 76/* tell the driver about vendor-specific slots */77static int vendor_firsts[CH_TYPES-4];78static int vendor_counts[CH_TYPES-4];79module_param_array(vendor_firsts, int, NULL, 0444);80module_param_array(vendor_counts, int, NULL, 0444);81 82static const char * vendor_labels[CH_TYPES-4] = {83 "v0", "v1", "v2", "v3"84};85// module_param_string_array(vendor_labels, NULL, 0444);86 87#define ch_printk(prefix, ch, fmt, a...) \88 sdev_prefix_printk(prefix, (ch)->device, (ch)->name, fmt, ##a)89 90#define DPRINTK(fmt, arg...) \91do { \92 if (debug) \93 ch_printk(KERN_DEBUG, ch, fmt, ##arg); \94} while (0)95#define VPRINTK(level, fmt, arg...) \96do { \97 if (verbose) \98 ch_printk(level, ch, fmt, ##arg); \99} while (0)100 101/* ------------------------------------------------------------------- */102 103#define MAX_RETRIES 1104 105static const struct class ch_sysfs_class = {106 .name = "scsi_changer",107};108 109typedef struct {110 struct kref ref;111 struct list_head list;112 int minor;113 char name[8];114 struct scsi_device *device;115 struct scsi_device **dt; /* ptrs to data transfer elements */116 u_int firsts[CH_TYPES];117 u_int counts[CH_TYPES];118 u_int voltags;119 struct mutex lock;120} scsi_changer;121 122static DEFINE_IDR(ch_index_idr);123static DEFINE_SPINLOCK(ch_index_lock);124 125static const struct {126 unsigned char sense;127 unsigned char asc;128 unsigned char ascq;129 int errno;130} ch_err[] = {131/* Just filled in what looks right. Hav'nt checked any standard paper for132 these errno assignments, so they may be wrong... */133 {134 .sense = ILLEGAL_REQUEST,135 .asc = 0x21,136 .ascq = 0x01,137 .errno = EBADSLT, /* Invalid element address */138 },{139 .sense = ILLEGAL_REQUEST,140 .asc = 0x28,141 .ascq = 0x01,142 .errno = EBADE, /* Import or export element accessed */143 },{144 .sense = ILLEGAL_REQUEST,145 .asc = 0x3B,146 .ascq = 0x0D,147 .errno = EXFULL, /* Medium destination element full */148 },{149 .sense = ILLEGAL_REQUEST,150 .asc = 0x3B,151 .ascq = 0x0E,152 .errno = EBADE, /* Medium source element empty */153 },{154 .sense = ILLEGAL_REQUEST,155 .asc = 0x20,156 .ascq = 0x00,157 .errno = EBADRQC, /* Invalid command operation code */158 },{159 /* end of list */160 }161};162 163/* ------------------------------------------------------------------- */164 165static int ch_find_errno(struct scsi_sense_hdr *sshdr)166{167 int i,errno = 0;168 169 /* Check to see if additional sense information is available */170 if (scsi_sense_valid(sshdr) &&171 sshdr->asc != 0) {172 for (i = 0; ch_err[i].errno != 0; i++) {173 if (ch_err[i].sense == sshdr->sense_key &&174 ch_err[i].asc == sshdr->asc &&175 ch_err[i].ascq == sshdr->ascq) {176 errno = -ch_err[i].errno;177 break;178 }179 }180 }181 if (errno == 0)182 errno = -EIO;183 return errno;184}185 186static int187ch_do_scsi(scsi_changer *ch, unsigned char *cmd, int cmd_len,188 void *buffer, unsigned int buflength, enum req_op op)189{190 int errno = 0, timeout, result;191 struct scsi_sense_hdr sshdr;192 struct scsi_failure failure_defs[] = {193 {194 .sense = UNIT_ATTENTION,195 .asc = SCMD_FAILURE_ASC_ANY,196 .ascq = SCMD_FAILURE_ASCQ_ANY,197 .allowed = 3,198 .result = SAM_STAT_CHECK_CONDITION,199 },200 {}201 };202 struct scsi_failures failures = {203 .failure_definitions = failure_defs,204 };205 const struct scsi_exec_args exec_args = {206 .sshdr = &sshdr,207 .failures = &failures,208 };209 210 timeout = (cmd[0] == INITIALIZE_ELEMENT_STATUS)211 ? timeout_init : timeout_move;212 213 result = scsi_execute_cmd(ch->device, cmd, op, buffer, buflength,214 timeout * HZ, MAX_RETRIES, &exec_args);215 if (result < 0)216 return result;217 if (scsi_sense_valid(&sshdr)) {218 if (debug)219 scsi_print_sense_hdr(ch->device, ch->name, &sshdr);220 errno = ch_find_errno(&sshdr);221 }222 return errno;223}224 225/* ------------------------------------------------------------------------ */226 227static int228ch_elem_to_typecode(scsi_changer *ch, u_int elem)229{230 int i;231 232 for (i = 0; i < CH_TYPES; i++) {233 if (elem >= ch->firsts[i] &&234 elem < ch->firsts[i] +235 ch->counts[i])236 return i+1;237 }238 return 0;239}240 241static int242ch_read_element_status(scsi_changer *ch, u_int elem, char *data)243{244 u_char cmd[12];245 u_char *buffer;246 int result;247 248 buffer = kmalloc(512, GFP_KERNEL);249 if(!buffer)250 return -ENOMEM;251 252 retry:253 memset(cmd,0,sizeof(cmd));254 cmd[0] = READ_ELEMENT_STATUS;255 cmd[1] = ((ch->device->lun & 0x7) << 5) |256 (ch->voltags ? 0x10 : 0) |257 ch_elem_to_typecode(ch,elem);258 cmd[2] = (elem >> 8) & 0xff;259 cmd[3] = elem & 0xff;260 cmd[5] = 1;261 cmd[9] = 255;262 if (0 == (result = ch_do_scsi(ch, cmd, 12,263 buffer, 256, REQ_OP_DRV_IN))) {264 if (((buffer[16] << 8) | buffer[17]) != elem) {265 DPRINTK("asked for element 0x%02x, got 0x%02x\n",266 elem,(buffer[16] << 8) | buffer[17]);267 kfree(buffer);268 return -EIO;269 }270 memcpy(data,buffer+16,16);271 } else {272 if (ch->voltags) {273 ch->voltags = 0;274 VPRINTK(KERN_INFO, "device has no volume tag support\n");275 goto retry;276 }277 DPRINTK("READ ELEMENT STATUS for element 0x%x failed\n",elem);278 }279 kfree(buffer);280 return result;281}282 283static int284ch_init_elem(scsi_changer *ch)285{286 int err;287 u_char cmd[6];288 289 VPRINTK(KERN_INFO, "INITIALIZE ELEMENT STATUS, may take some time ...\n");290 memset(cmd,0,sizeof(cmd));291 cmd[0] = INITIALIZE_ELEMENT_STATUS;292 cmd[1] = (ch->device->lun & 0x7) << 5;293 err = ch_do_scsi(ch, cmd, 6, NULL, 0, REQ_OP_DRV_IN);294 VPRINTK(KERN_INFO, "... finished\n");295 return err;296}297 298static int299ch_readconfig(scsi_changer *ch)300{301 u_char cmd[10], data[16];302 u_char *buffer;303 int result,id,lun,i;304 u_int elem;305 306 buffer = kzalloc(512, GFP_KERNEL);307 if (!buffer)308 return -ENOMEM;309 310 memset(cmd,0,sizeof(cmd));311 cmd[0] = MODE_SENSE;312 cmd[1] = (ch->device->lun & 0x7) << 5;313 cmd[2] = 0x1d;314 cmd[4] = 255;315 result = ch_do_scsi(ch, cmd, 10, buffer, 255, REQ_OP_DRV_IN);316 if (0 != result) {317 cmd[1] |= (1<<3);318 result = ch_do_scsi(ch, cmd, 10, buffer, 255, REQ_OP_DRV_IN);319 }320 if (0 == result) {321 ch->firsts[CHET_MT] =322 (buffer[buffer[3]+ 6] << 8) | buffer[buffer[3]+ 7];323 ch->counts[CHET_MT] =324 (buffer[buffer[3]+ 8] << 8) | buffer[buffer[3]+ 9];325 ch->firsts[CHET_ST] =326 (buffer[buffer[3]+10] << 8) | buffer[buffer[3]+11];327 ch->counts[CHET_ST] =328 (buffer[buffer[3]+12] << 8) | buffer[buffer[3]+13];329 ch->firsts[CHET_IE] =330 (buffer[buffer[3]+14] << 8) | buffer[buffer[3]+15];331 ch->counts[CHET_IE] =332 (buffer[buffer[3]+16] << 8) | buffer[buffer[3]+17];333 ch->firsts[CHET_DT] =334 (buffer[buffer[3]+18] << 8) | buffer[buffer[3]+19];335 ch->counts[CHET_DT] =336 (buffer[buffer[3]+20] << 8) | buffer[buffer[3]+21];337 VPRINTK(KERN_INFO, "type #1 (mt): 0x%x+%d [medium transport]\n",338 ch->firsts[CHET_MT],339 ch->counts[CHET_MT]);340 VPRINTK(KERN_INFO, "type #2 (st): 0x%x+%d [storage]\n",341 ch->firsts[CHET_ST],342 ch->counts[CHET_ST]);343 VPRINTK(KERN_INFO, "type #3 (ie): 0x%x+%d [import/export]\n",344 ch->firsts[CHET_IE],345 ch->counts[CHET_IE]);346 VPRINTK(KERN_INFO, "type #4 (dt): 0x%x+%d [data transfer]\n",347 ch->firsts[CHET_DT],348 ch->counts[CHET_DT]);349 } else {350 VPRINTK(KERN_INFO, "reading element address assignment page failed!\n");351 }352 353 /* vendor specific element types */354 for (i = 0; i < 4; i++) {355 if (0 == vendor_counts[i])356 continue;357 if (NULL == vendor_labels[i])358 continue;359 ch->firsts[CHET_V1+i] = vendor_firsts[i];360 ch->counts[CHET_V1+i] = vendor_counts[i];361 VPRINTK(KERN_INFO, "type #%d (v%d): 0x%x+%d [%s, vendor specific]\n",362 i+5,i+1,vendor_firsts[i],vendor_counts[i],363 vendor_labels[i]);364 }365 366 /* look up the devices of the data transfer elements */367 ch->dt = kcalloc(ch->counts[CHET_DT], sizeof(*ch->dt),368 GFP_KERNEL);369 370 if (!ch->dt) {371 kfree(buffer);372 return -ENOMEM;373 }374 375 for (elem = 0; elem < ch->counts[CHET_DT]; elem++) {376 id = -1;377 lun = 0;378 if (elem < CH_DT_MAX && -1 != dt_id[elem]) {379 id = dt_id[elem];380 lun = dt_lun[elem];381 VPRINTK(KERN_INFO, "dt 0x%x: [insmod option] ",382 elem+ch->firsts[CHET_DT]);383 } else if (0 != ch_read_element_status384 (ch,elem+ch->firsts[CHET_DT],data)) {385 VPRINTK(KERN_INFO, "dt 0x%x: READ ELEMENT STATUS failed\n",386 elem+ch->firsts[CHET_DT]);387 } else {388 VPRINTK(KERN_INFO, "dt 0x%x: ",elem+ch->firsts[CHET_DT]);389 if (data[6] & 0x80) {390 VPRINTK(KERN_CONT, "not this SCSI bus\n");391 ch->dt[elem] = NULL;392 } else if (0 == (data[6] & 0x30)) {393 VPRINTK(KERN_CONT, "ID/LUN unknown\n");394 ch->dt[elem] = NULL;395 } else {396 id = ch->device->id;397 lun = 0;398 if (data[6] & 0x20) id = data[7];399 if (data[6] & 0x10) lun = data[6] & 7;400 }401 }402 if (-1 != id) {403 VPRINTK(KERN_CONT, "ID %i, LUN %i, ",id,lun);404 ch->dt[elem] =405 scsi_device_lookup(ch->device->host,406 ch->device->channel,407 id,lun);408 if (!ch->dt[elem]) {409 /* should not happen */410 VPRINTK(KERN_CONT, "Huh? device not found!\n");411 } else {412 VPRINTK(KERN_CONT, "name: %8.8s %16.16s %4.4s\n",413 ch->dt[elem]->vendor,414 ch->dt[elem]->model,415 ch->dt[elem]->rev);416 }417 }418 }419 ch->voltags = 1;420 kfree(buffer);421 422 return 0;423}424 425/* ------------------------------------------------------------------------ */426 427static int428ch_position(scsi_changer *ch, u_int trans, u_int elem, int rotate)429{430 u_char cmd[10];431 432 DPRINTK("position: 0x%x\n",elem);433 if (0 == trans)434 trans = ch->firsts[CHET_MT];435 memset(cmd,0,sizeof(cmd));436 cmd[0] = POSITION_TO_ELEMENT;437 cmd[1] = (ch->device->lun & 0x7) << 5;438 cmd[2] = (trans >> 8) & 0xff;439 cmd[3] = trans & 0xff;440 cmd[4] = (elem >> 8) & 0xff;441 cmd[5] = elem & 0xff;442 cmd[8] = rotate ? 1 : 0;443 return ch_do_scsi(ch, cmd, 10, NULL, 0, REQ_OP_DRV_IN);444}445 446static int447ch_move(scsi_changer *ch, u_int trans, u_int src, u_int dest, int rotate)448{449 u_char cmd[12];450 451 DPRINTK("move: 0x%x => 0x%x\n",src,dest);452 if (0 == trans)453 trans = ch->firsts[CHET_MT];454 memset(cmd,0,sizeof(cmd));455 cmd[0] = MOVE_MEDIUM;456 cmd[1] = (ch->device->lun & 0x7) << 5;457 cmd[2] = (trans >> 8) & 0xff;458 cmd[3] = trans & 0xff;459 cmd[4] = (src >> 8) & 0xff;460 cmd[5] = src & 0xff;461 cmd[6] = (dest >> 8) & 0xff;462 cmd[7] = dest & 0xff;463 cmd[10] = rotate ? 1 : 0;464 return ch_do_scsi(ch, cmd, 12, NULL, 0, REQ_OP_DRV_IN);465}466 467static int468ch_exchange(scsi_changer *ch, u_int trans, u_int src,469 u_int dest1, u_int dest2, int rotate1, int rotate2)470{471 u_char cmd[12];472 473 DPRINTK("exchange: 0x%x => 0x%x => 0x%x\n",474 src,dest1,dest2);475 if (0 == trans)476 trans = ch->firsts[CHET_MT];477 memset(cmd,0,sizeof(cmd));478 cmd[0] = EXCHANGE_MEDIUM;479 cmd[1] = (ch->device->lun & 0x7) << 5;480 cmd[2] = (trans >> 8) & 0xff;481 cmd[3] = trans & 0xff;482 cmd[4] = (src >> 8) & 0xff;483 cmd[5] = src & 0xff;484 cmd[6] = (dest1 >> 8) & 0xff;485 cmd[7] = dest1 & 0xff;486 cmd[8] = (dest2 >> 8) & 0xff;487 cmd[9] = dest2 & 0xff;488 cmd[10] = (rotate1 ? 1 : 0) | (rotate2 ? 2 : 0);489 490 return ch_do_scsi(ch, cmd, 12, NULL, 0, REQ_OP_DRV_IN);491}492 493static void494ch_check_voltag(char *tag)495{496 int i;497 498 for (i = 0; i < 32; i++) {499 /* restrict to ascii */500 if (tag[i] >= 0x7f || tag[i] < 0x20)501 tag[i] = ' ';502 /* don't allow search wildcards */503 if (tag[i] == '?' ||504 tag[i] == '*')505 tag[i] = ' ';506 }507}508 509static int510ch_set_voltag(scsi_changer *ch, u_int elem,511 int alternate, int clear, u_char *tag)512{513 u_char cmd[12];514 u_char *buffer;515 int result;516 517 buffer = kzalloc(512, GFP_KERNEL);518 if (!buffer)519 return -ENOMEM;520 521 DPRINTK("%s %s voltag: 0x%x => \"%s\"\n",522 clear ? "clear" : "set",523 alternate ? "alternate" : "primary",524 elem, tag);525 memset(cmd,0,sizeof(cmd));526 cmd[0] = SEND_VOLUME_TAG;527 cmd[1] = ((ch->device->lun & 0x7) << 5) |528 ch_elem_to_typecode(ch,elem);529 cmd[2] = (elem >> 8) & 0xff;530 cmd[3] = elem & 0xff;531 cmd[5] = clear532 ? (alternate ? 0x0d : 0x0c)533 : (alternate ? 0x0b : 0x0a);534 535 cmd[9] = 255;536 537 memcpy(buffer,tag,32);538 ch_check_voltag(buffer);539 540 result = ch_do_scsi(ch, cmd, 12, buffer, 256, REQ_OP_DRV_OUT);541 kfree(buffer);542 return result;543}544 545static int ch_gstatus(scsi_changer *ch, int type, unsigned char __user *dest)546{547 int retval = 0;548 u_char data[16];549 unsigned int i;550 551 mutex_lock(&ch->lock);552 for (i = 0; i < ch->counts[type]; i++) {553 if (0 != ch_read_element_status554 (ch, ch->firsts[type]+i,data)) {555 retval = -EIO;556 break;557 }558 put_user(data[2], dest+i);559 if (data[2] & CESTATUS_EXCEPT)560 VPRINTK(KERN_INFO, "element 0x%x: asc=0x%x, ascq=0x%x\n",561 ch->firsts[type]+i,562 (int)data[4],(int)data[5]);563 retval = ch_read_element_status564 (ch, ch->firsts[type]+i,data);565 if (0 != retval)566 break;567 }568 mutex_unlock(&ch->lock);569 return retval;570}571 572/* ------------------------------------------------------------------------ */573 574static void ch_destroy(struct kref *ref)575{576 scsi_changer *ch = container_of(ref, scsi_changer, ref);577 578 ch->device = NULL;579 kfree(ch->dt);580 kfree(ch);581}582 583static int584ch_release(struct inode *inode, struct file *file)585{586 scsi_changer *ch = file->private_data;587 588 scsi_device_put(ch->device);589 file->private_data = NULL;590 kref_put(&ch->ref, ch_destroy);591 return 0;592}593 594static int595ch_open(struct inode *inode, struct file *file)596{597 scsi_changer *ch;598 int minor = iminor(inode);599 600 spin_lock(&ch_index_lock);601 ch = idr_find(&ch_index_idr, minor);602 603 if (ch == NULL || !kref_get_unless_zero(&ch->ref)) {604 spin_unlock(&ch_index_lock);605 return -ENXIO;606 }607 spin_unlock(&ch_index_lock);608 if (scsi_device_get(ch->device)) {609 kref_put(&ch->ref, ch_destroy);610 return -ENXIO;611 }612 /* Synchronize with ch_probe() */613 mutex_lock(&ch->lock);614 file->private_data = ch;615 mutex_unlock(&ch->lock);616 return 0;617}618 619static int620ch_checkrange(scsi_changer *ch, unsigned int type, unsigned int unit)621{622 if (type >= CH_TYPES || unit >= ch->counts[type])623 return -1;624 return 0;625}626 627struct changer_element_status32 {628 int ces_type;629 compat_uptr_t ces_data;630};631#define CHIOGSTATUS32 _IOW('c', 8, struct changer_element_status32)632 633static long ch_ioctl(struct file *file,634 unsigned int cmd, unsigned long arg)635{636 scsi_changer *ch = file->private_data;637 int retval;638 void __user *argp = (void __user *)arg;639 640 retval = scsi_ioctl_block_when_processing_errors(ch->device, cmd,641 file->f_flags & O_NDELAY);642 if (retval)643 return retval;644 645 switch (cmd) {646 case CHIOGPARAMS:647 {648 struct changer_params params;649 650 params.cp_curpicker = 0;651 params.cp_npickers = ch->counts[CHET_MT];652 params.cp_nslots = ch->counts[CHET_ST];653 params.cp_nportals = ch->counts[CHET_IE];654 params.cp_ndrives = ch->counts[CHET_DT];655 656 if (copy_to_user(argp, ¶ms, sizeof(params)))657 return -EFAULT;658 return 0;659 }660 case CHIOGVPARAMS:661 {662 struct changer_vendor_params vparams;663 664 memset(&vparams,0,sizeof(vparams));665 if (ch->counts[CHET_V1]) {666 vparams.cvp_n1 = ch->counts[CHET_V1];667 strscpy(vparams.cvp_label1, vendor_labels[0],668 sizeof(vparams.cvp_label1));669 }670 if (ch->counts[CHET_V2]) {671 vparams.cvp_n2 = ch->counts[CHET_V2];672 strscpy(vparams.cvp_label2, vendor_labels[1],673 sizeof(vparams.cvp_label2));674 }675 if (ch->counts[CHET_V3]) {676 vparams.cvp_n3 = ch->counts[CHET_V3];677 strscpy(vparams.cvp_label3, vendor_labels[2],678 sizeof(vparams.cvp_label3));679 }680 if (ch->counts[CHET_V4]) {681 vparams.cvp_n4 = ch->counts[CHET_V4];682 strscpy(vparams.cvp_label4, vendor_labels[3],683 sizeof(vparams.cvp_label4));684 }685 if (copy_to_user(argp, &vparams, sizeof(vparams)))686 return -EFAULT;687 return 0;688 }689 690 case CHIOPOSITION:691 {692 struct changer_position pos;693 694 if (copy_from_user(&pos, argp, sizeof (pos)))695 return -EFAULT;696 697 if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) {698 DPRINTK("CHIOPOSITION: invalid parameter\n");699 return -EBADSLT;700 }701 mutex_lock(&ch->lock);702 retval = ch_position(ch,0,703 ch->firsts[pos.cp_type] + pos.cp_unit,704 pos.cp_flags & CP_INVERT);705 mutex_unlock(&ch->lock);706 return retval;707 }708 709 case CHIOMOVE:710 {711 struct changer_move mv;712 713 if (copy_from_user(&mv, argp, sizeof (mv)))714 return -EFAULT;715 716 if (0 != ch_checkrange(ch, mv.cm_fromtype, mv.cm_fromunit) ||717 0 != ch_checkrange(ch, mv.cm_totype, mv.cm_tounit )) {718 DPRINTK("CHIOMOVE: invalid parameter\n");719 return -EBADSLT;720 }721 722 mutex_lock(&ch->lock);723 retval = ch_move(ch,0,724 ch->firsts[mv.cm_fromtype] + mv.cm_fromunit,725 ch->firsts[mv.cm_totype] + mv.cm_tounit,726 mv.cm_flags & CM_INVERT);727 mutex_unlock(&ch->lock);728 return retval;729 }730 731 case CHIOEXCHANGE:732 {733 struct changer_exchange mv;734 735 if (copy_from_user(&mv, argp, sizeof (mv)))736 return -EFAULT;737 738 if (0 != ch_checkrange(ch, mv.ce_srctype, mv.ce_srcunit ) ||739 0 != ch_checkrange(ch, mv.ce_fdsttype, mv.ce_fdstunit) ||740 0 != ch_checkrange(ch, mv.ce_sdsttype, mv.ce_sdstunit)) {741 DPRINTK("CHIOEXCHANGE: invalid parameter\n");742 return -EBADSLT;743 }744 745 mutex_lock(&ch->lock);746 retval = ch_exchange747 (ch,0,748 ch->firsts[mv.ce_srctype] + mv.ce_srcunit,749 ch->firsts[mv.ce_fdsttype] + mv.ce_fdstunit,750 ch->firsts[mv.ce_sdsttype] + mv.ce_sdstunit,751 mv.ce_flags & CE_INVERT1, mv.ce_flags & CE_INVERT2);752 mutex_unlock(&ch->lock);753 return retval;754 }755 756 case CHIOGSTATUS:757 {758 struct changer_element_status ces;759 760 if (copy_from_user(&ces, argp, sizeof (ces)))761 return -EFAULT;762 if (ces.ces_type < 0 || ces.ces_type >= CH_TYPES)763 return -EINVAL;764 765 return ch_gstatus(ch, ces.ces_type, ces.ces_data);766 }767#ifdef CONFIG_COMPAT768 case CHIOGSTATUS32:769 {770 struct changer_element_status32 ces32;771 772 if (copy_from_user(&ces32, argp, sizeof(ces32)))773 return -EFAULT;774 if (ces32.ces_type < 0 || ces32.ces_type >= CH_TYPES)775 return -EINVAL;776 777 return ch_gstatus(ch, ces32.ces_type,778 compat_ptr(ces32.ces_data));779 }780#endif781 case CHIOGELEM:782 {783 struct changer_get_element cge;784 u_char ch_cmd[12];785 u_char *buffer;786 unsigned int elem;787 int result,i;788 789 if (copy_from_user(&cge, argp, sizeof (cge)))790 return -EFAULT;791 792 if (0 != ch_checkrange(ch, cge.cge_type, cge.cge_unit))793 return -EINVAL;794 elem = ch->firsts[cge.cge_type] + cge.cge_unit;795 796 buffer = kmalloc(512, GFP_KERNEL);797 if (!buffer)798 return -ENOMEM;799 mutex_lock(&ch->lock);800 801 voltag_retry:802 memset(ch_cmd, 0, sizeof(ch_cmd));803 ch_cmd[0] = READ_ELEMENT_STATUS;804 ch_cmd[1] = ((ch->device->lun & 0x7) << 5) |805 (ch->voltags ? 0x10 : 0) |806 ch_elem_to_typecode(ch,elem);807 ch_cmd[2] = (elem >> 8) & 0xff;808 ch_cmd[3] = elem & 0xff;809 ch_cmd[5] = 1;810 ch_cmd[9] = 255;811 812 result = ch_do_scsi(ch, ch_cmd, 12, buffer, 256, REQ_OP_DRV_IN);813 if (!result) {814 cge.cge_status = buffer[18];815 cge.cge_flags = 0;816 if (buffer[18] & CESTATUS_EXCEPT) {817 cge.cge_errno = EIO;818 }819 if (buffer[25] & 0x80) {820 cge.cge_flags |= CGE_SRC;821 if (buffer[25] & 0x40)822 cge.cge_flags |= CGE_INVERT;823 elem = (buffer[26]<<8) | buffer[27];824 for (i = 0; i < 4; i++) {825 if (elem >= ch->firsts[i] &&826 elem < ch->firsts[i] + ch->counts[i]) {827 cge.cge_srctype = i;828 cge.cge_srcunit = elem-ch->firsts[i];829 }830 }831 }832 if ((buffer[22] & 0x30) == 0x30) {833 cge.cge_flags |= CGE_IDLUN;834 cge.cge_id = buffer[23];835 cge.cge_lun = buffer[22] & 7;836 }837 if (buffer[9] & 0x80) {838 cge.cge_flags |= CGE_PVOLTAG;839 memcpy(cge.cge_pvoltag,buffer+28,36);840 }841 if (buffer[9] & 0x40) {842 cge.cge_flags |= CGE_AVOLTAG;843 memcpy(cge.cge_avoltag,buffer+64,36);844 }845 } else if (ch->voltags) {846 ch->voltags = 0;847 VPRINTK(KERN_INFO, "device has no volume tag support\n");848 goto voltag_retry;849 }850 kfree(buffer);851 mutex_unlock(&ch->lock);852 853 if (copy_to_user(argp, &cge, sizeof (cge)))854 return -EFAULT;855 return result;856 }857 858 case CHIOINITELEM:859 {860 mutex_lock(&ch->lock);861 retval = ch_init_elem(ch);862 mutex_unlock(&ch->lock);863 return retval;864 }865 866 case CHIOSVOLTAG:867 {868 struct changer_set_voltag csv;869 int elem;870 871 if (copy_from_user(&csv, argp, sizeof(csv)))872 return -EFAULT;873 874 if (0 != ch_checkrange(ch, csv.csv_type, csv.csv_unit)) {875 DPRINTK("CHIOSVOLTAG: invalid parameter\n");876 return -EBADSLT;877 }878 elem = ch->firsts[csv.csv_type] + csv.csv_unit;879 mutex_lock(&ch->lock);880 retval = ch_set_voltag(ch, elem,881 csv.csv_flags & CSV_AVOLTAG,882 csv.csv_flags & CSV_CLEARTAG,883 csv.csv_voltag);884 mutex_unlock(&ch->lock);885 return retval;886 }887 888 default:889 return scsi_ioctl(ch->device, file->f_mode & FMODE_WRITE, cmd,890 argp);891 892 }893}894 895/* ------------------------------------------------------------------------ */896 897static int ch_probe(struct device *dev)898{899 struct scsi_device *sd = to_scsi_device(dev);900 struct device *class_dev;901 int ret;902 scsi_changer *ch;903 904 if (sd->type != TYPE_MEDIUM_CHANGER)905 return -ENODEV;906 907 ch = kzalloc(sizeof(*ch), GFP_KERNEL);908 if (NULL == ch)909 return -ENOMEM;910 911 idr_preload(GFP_KERNEL);912 spin_lock(&ch_index_lock);913 ret = idr_alloc(&ch_index_idr, ch, 0, CH_MAX_DEVS + 1, GFP_NOWAIT);914 spin_unlock(&ch_index_lock);915 idr_preload_end();916 917 if (ret < 0) {918 if (ret == -ENOSPC)919 ret = -ENODEV;920 goto free_ch;921 }922 923 ch->minor = ret;924 sprintf(ch->name,"ch%d",ch->minor);925 ret = scsi_device_get(sd);926 if (ret) {927 sdev_printk(KERN_WARNING, sd, "ch%d: failed to get device\n",928 ch->minor);929 goto remove_idr;930 }931 932 mutex_init(&ch->lock);933 kref_init(&ch->ref);934 ch->device = sd;935 class_dev = device_create(&ch_sysfs_class, dev,936 MKDEV(SCSI_CHANGER_MAJOR, ch->minor), ch,937 "s%s", ch->name);938 if (IS_ERR(class_dev)) {939 sdev_printk(KERN_WARNING, sd, "ch%d: device_create failed\n",940 ch->minor);941 ret = PTR_ERR(class_dev);942 goto put_device;943 }944 945 mutex_lock(&ch->lock);946 ret = ch_readconfig(ch);947 if (ret) {948 mutex_unlock(&ch->lock);949 goto destroy_dev;950 }951 if (init)952 ch_init_elem(ch);953 954 mutex_unlock(&ch->lock);955 dev_set_drvdata(dev, ch);956 sdev_printk(KERN_INFO, sd, "Attached scsi changer %s\n", ch->name);957 958 return 0;959destroy_dev:960 device_destroy(&ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR, ch->minor));961put_device:962 scsi_device_put(sd);963remove_idr:964 idr_remove(&ch_index_idr, ch->minor);965free_ch:966 kfree(ch);967 return ret;968}969 970static int ch_remove(struct device *dev)971{972 scsi_changer *ch = dev_get_drvdata(dev);973 974 spin_lock(&ch_index_lock);975 idr_remove(&ch_index_idr, ch->minor);976 dev_set_drvdata(dev, NULL);977 spin_unlock(&ch_index_lock);978 979 device_destroy(&ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR, ch->minor));980 scsi_device_put(ch->device);981 kref_put(&ch->ref, ch_destroy);982 return 0;983}984 985static struct scsi_driver ch_template = {986 .gendrv = {987 .name = "ch",988 .owner = THIS_MODULE,989 .probe = ch_probe,990 .remove = ch_remove,991 },992};993 994static const struct file_operations changer_fops = {995 .owner = THIS_MODULE,996 .open = ch_open,997 .release = ch_release,998 .unlocked_ioctl = ch_ioctl,999 .compat_ioctl = compat_ptr_ioctl,1000 .llseek = noop_llseek,1001};1002 1003static int __init init_ch_module(void)1004{1005 int rc;1006 1007 printk(KERN_INFO "SCSI Media Changer driver v" VERSION " \n");1008 rc = class_register(&ch_sysfs_class);1009 if (rc)1010 return rc;1011 rc = register_chrdev(SCSI_CHANGER_MAJOR,"ch",&changer_fops);1012 if (rc < 0) {1013 printk("Unable to get major %d for SCSI-Changer\n",1014 SCSI_CHANGER_MAJOR);1015 goto fail1;1016 }1017 rc = scsi_register_driver(&ch_template.gendrv);1018 if (rc < 0)1019 goto fail2;1020 return 0;1021 1022 fail2:1023 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");1024 fail1:1025 class_unregister(&ch_sysfs_class);1026 return rc;1027}1028 1029static void __exit exit_ch_module(void)1030{1031 scsi_unregister_driver(&ch_template.gendrv);1032 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");1033 class_unregister(&ch_sysfs_class);1034 idr_destroy(&ch_index_idr);1035}1036 1037module_init(init_ch_module);1038module_exit(exit_ch_module);1039