1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * SCSI Media Changer device driver for Linux 2.6 4 * 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 16 38 #define CH_TYPES 8 39 #define CH_MAX_DEVS 128 40 41 MODULE_DESCRIPTION("device driver for scsi media changer devices"); 42 MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org>"); 43 MODULE_LICENSE("GPL"); 44 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_CHANGER_MAJOR); 45 MODULE_ALIAS_SCSI_DEVICE(TYPE_MEDIUM_CHANGER); 46 47 static int init = 1; 48 module_param(init, int, 0444); 49 MODULE_PARM_DESC(init, \ 50 "initialize element status on driver load (default: on)"); 51 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)"); 56 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)"); 61 62 static int verbose = 1; 63 module_param(verbose, int, 0644); 64 MODULE_PARM_DESC(verbose,"be verbose (default: on)"); 65 66 static int debug; 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)"); 70 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); 75 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); 81 82 static 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...) \ 91 do { \ 92 if (debug) \ 93 ch_printk(KERN_DEBUG, ch, fmt, ##arg); \ 94 } while (0) 95 #define VPRINTK(level, fmt, arg...) \ 96 do { \ 97 if (verbose) \ 98 ch_printk(level, ch, fmt, ##arg); \ 99 } while (0) 100 101 /* ------------------------------------------------------------------- */ 102 103 #define MAX_RETRIES 1 104 105 static struct class * ch_sysfs_class; 106 107 typedef struct { 108 struct kref ref; 109 struct list_head list; 110 int minor; 111 char name[8]; 112 struct scsi_device *device; 113 struct scsi_device **dt; /* ptrs to data transfer elements */ 114 u_int firsts[CH_TYPES]; 115 u_int counts[CH_TYPES]; 116 u_int voltags; 117 struct mutex lock; 118 } scsi_changer; 119 120 static DEFINE_IDR(ch_index_idr); 121 static DEFINE_SPINLOCK(ch_index_lock); 122 123 static const struct { 124 unsigned char sense; 125 unsigned char asc; 126 unsigned char ascq; 127 int errno; 128 } ch_err[] = { 129 /* Just filled in what looks right. Hav'nt checked any standard paper for 130 these errno assignments, so they may be wrong... */ 131 { 132 .sense = ILLEGAL_REQUEST, 133 .asc = 0x21, 134 .ascq = 0x01, 135 .errno = EBADSLT, /* Invalid element address */ 136 },{ 137 .sense = ILLEGAL_REQUEST, 138 .asc = 0x28, 139 .ascq = 0x01, 140 .errno = EBADE, /* Import or export element accessed */ 141 },{ 142 .sense = ILLEGAL_REQUEST, 143 .asc = 0x3B, 144 .ascq = 0x0D, 145 .errno = EXFULL, /* Medium destination element full */ 146 },{ 147 .sense = ILLEGAL_REQUEST, 148 .asc = 0x3B, 149 .ascq = 0x0E, 150 .errno = EBADE, /* Medium source element empty */ 151 },{ 152 .sense = ILLEGAL_REQUEST, 153 .asc = 0x20, 154 .ascq = 0x00, 155 .errno = EBADRQC, /* Invalid command operation code */ 156 },{ 157 /* end of list */ 158 } 159 }; 160 161 /* ------------------------------------------------------------------- */ 162 163 static int ch_find_errno(struct scsi_sense_hdr *sshdr) 164 { 165 int i,errno = 0; 166 167 /* Check to see if additional sense information is available */ 168 if (scsi_sense_valid(sshdr) && 169 sshdr->asc != 0) { 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; 175 break; 176 } 177 } 178 } 179 if (errno == 0) 180 errno = -EIO; 181 return errno; 182 } 183 184 static int 185 ch_do_scsi(scsi_changer *ch, unsigned char *cmd, int cmd_len, 186 void *buffer, unsigned int buflength, enum req_op op) 187 { 188 int errno = 0, timeout, result; 189 struct scsi_sense_hdr sshdr; 190 struct scsi_failure failure_defs[] = { 191 { 192 .sense = UNIT_ATTENTION, 193 .asc = SCMD_FAILURE_ASC_ANY, 194 .ascq = SCMD_FAILURE_ASCQ_ANY, 195 .allowed = 3, 196 .result = SAM_STAT_CHECK_CONDITION, 197 }, 198 {} 199 }; 200 struct scsi_failures failures = { 201 .failure_definitions = failure_defs, 202 }; 203 const struct scsi_exec_args exec_args = { 204 .sshdr = &sshdr, 205 .failures = &failures, 206 }; 207 208 timeout = (cmd[0] == INITIALIZE_ELEMENT_STATUS) 209 ? timeout_init : timeout_move; 210 211 result = scsi_execute_cmd(ch->device, cmd, op, buffer, buflength, 212 timeout * HZ, MAX_RETRIES, &exec_args); 213 if (result < 0) 214 return result; 215 if (scsi_sense_valid(&sshdr)) { 216 if (debug) 217 scsi_print_sense_hdr(ch->device, ch->name, &sshdr); 218 errno = ch_find_errno(&sshdr); 219 } 220 return errno; 221 } 222 223 /* ------------------------------------------------------------------------ */ 224 225 static int 226 ch_elem_to_typecode(scsi_changer *ch, u_int elem) 227 { 228 int i; 229 230 for (i = 0; i < CH_TYPES; i++) { 231 if (elem >= ch->firsts[i] && 232 elem < ch->firsts[i] + 233 ch->counts[i]) 234 return i+1; 235 } 236 return 0; 237 } 238 239 static int 240 ch_read_element_status(scsi_changer *ch, u_int elem, char *data) 241 { 242 u_char cmd[12]; 243 u_char *buffer; 244 int result; 245 246 buffer = kmalloc(512, GFP_KERNEL); 247 if(!buffer) 248 return -ENOMEM; 249 250 retry: 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; 258 cmd[5] = 1; 259 cmd[9] = 255; 260 if (0 == (result = ch_do_scsi(ch, cmd, 12, 261 buffer, 256, REQ_OP_DRV_IN))) { 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]); 265 kfree(buffer); 266 return -EIO; 267 } 268 memcpy(data,buffer+16,16); 269 } else { 270 if (ch->voltags) { 271 ch->voltags = 0; 272 VPRINTK(KERN_INFO, "device has no volume tag support\n"); 273 goto retry; 274 } 275 DPRINTK("READ ELEMENT STATUS for element 0x%x failed\n",elem); 276 } 277 kfree(buffer); 278 return result; 279 } 280 281 static int 282 ch_init_elem(scsi_changer *ch) 283 { 284 int err; 285 u_char cmd[6]; 286 287 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, REQ_OP_DRV_IN); 292 VPRINTK(KERN_INFO, "... finished\n"); 293 return err; 294 } 295 296 static int 297 ch_readconfig(scsi_changer *ch) 298 { 299 u_char cmd[10], data[16]; 300 u_char *buffer; 301 int result,id,lun,i; 302 u_int elem; 303 304 buffer = kzalloc(512, GFP_KERNEL); 305 if (!buffer) 306 return -ENOMEM; 307 308 memset(cmd,0,sizeof(cmd)); 309 cmd[0] = MODE_SENSE; 310 cmd[1] = (ch->device->lun & 0x7) << 5; 311 cmd[2] = 0x1d; 312 cmd[4] = 255; 313 result = ch_do_scsi(ch, cmd, 10, buffer, 255, REQ_OP_DRV_IN); 314 if (0 != result) { 315 cmd[1] |= (1<<3); 316 result = ch_do_scsi(ch, cmd, 10, buffer, 255, REQ_OP_DRV_IN); 317 } 318 if (0 == result) { 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", 336 ch->firsts[CHET_MT], 337 ch->counts[CHET_MT]); 338 VPRINTK(KERN_INFO, "type #2 (st): 0x%x+%d [storage]\n", 339 ch->firsts[CHET_ST], 340 ch->counts[CHET_ST]); 341 VPRINTK(KERN_INFO, "type #3 (ie): 0x%x+%d [import/export]\n", 342 ch->firsts[CHET_IE], 343 ch->counts[CHET_IE]); 344 VPRINTK(KERN_INFO, "type #4 (dt): 0x%x+%d [data transfer]\n", 345 ch->firsts[CHET_DT], 346 ch->counts[CHET_DT]); 347 } else { 348 VPRINTK(KERN_INFO, "reading element address assignment page failed!\n"); 349 } 350 351 /* vendor specific element types */ 352 for (i = 0; i < 4; i++) { 353 if (0 == vendor_counts[i]) 354 continue; 355 if (NULL == vendor_labels[i]) 356 continue; 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], 361 vendor_labels[i]); 362 } 363 364 /* look up the devices of the data transfer elements */ 365 ch->dt = kcalloc(ch->counts[CHET_DT], sizeof(*ch->dt), 366 GFP_KERNEL); 367 368 if (!ch->dt) { 369 kfree(buffer); 370 return -ENOMEM; 371 } 372 373 for (elem = 0; elem < ch->counts[CHET_DT]; elem++) { 374 id = -1; 375 lun = 0; 376 if (elem < CH_DT_MAX && -1 != dt_id[elem]) { 377 id = dt_id[elem]; 378 lun = dt_lun[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]); 385 } else { 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"); 389 ch->dt[elem] = NULL; 390 } else if (0 == (data[6] & 0x30)) { 391 VPRINTK(KERN_CONT, "ID/LUN unknown\n"); 392 ch->dt[elem] = NULL; 393 } else { 394 id = ch->device->id; 395 lun = 0; 396 if (data[6] & 0x20) id = data[7]; 397 if (data[6] & 0x10) lun = data[6] & 7; 398 } 399 } 400 if (-1 != id) { 401 VPRINTK(KERN_CONT, "ID %i, LUN %i, ",id,lun); 402 ch->dt[elem] = 403 scsi_device_lookup(ch->device->host, 404 ch->device->channel, 405 id,lun); 406 if (!ch->dt[elem]) { 407 /* should not happen */ 408 VPRINTK(KERN_CONT, "Huh? device not found!\n"); 409 } else { 410 VPRINTK(KERN_CONT, "name: %8.8s %16.16s %4.4s\n", 411 ch->dt[elem]->vendor, 412 ch->dt[elem]->model, 413 ch->dt[elem]->rev); 414 } 415 } 416 } 417 ch->voltags = 1; 418 kfree(buffer); 419 420 return 0; 421 } 422 423 /* ------------------------------------------------------------------------ */ 424 425 static int 426 ch_position(scsi_changer *ch, u_int trans, u_int elem, int rotate) 427 { 428 u_char cmd[10]; 429 430 DPRINTK("position: 0x%x\n",elem); 431 if (0 == trans) 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, REQ_OP_DRV_IN); 442 } 443 444 static int 445 ch_move(scsi_changer *ch, u_int trans, u_int src, u_int dest, int rotate) 446 { 447 u_char cmd[12]; 448 449 DPRINTK("move: 0x%x => 0x%x\n",src,dest); 450 if (0 == trans) 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; 458 cmd[5] = src & 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, REQ_OP_DRV_IN); 463 } 464 465 static int 466 ch_exchange(scsi_changer *ch, u_int trans, u_int src, 467 u_int dest1, u_int dest2, int rotate1, int rotate2) 468 { 469 u_char cmd[12]; 470 471 DPRINTK("exchange: 0x%x => 0x%x => 0x%x\n", 472 src,dest1,dest2); 473 if (0 == trans) 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; 481 cmd[5] = src & 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); 487 488 return ch_do_scsi(ch, cmd, 12, NULL, 0, REQ_OP_DRV_IN); 489 } 490 491 static void 492 ch_check_voltag(char *tag) 493 { 494 int i; 495 496 for (i = 0; i < 32; i++) { 497 /* restrict to ascii */ 498 if (tag[i] >= 0x7f || tag[i] < 0x20) 499 tag[i] = ' '; 500 /* don't allow search wildcards */ 501 if (tag[i] == '?' || 502 tag[i] == '*') 503 tag[i] = ' '; 504 } 505 } 506 507 static int 508 ch_set_voltag(scsi_changer *ch, u_int elem, 509 int alternate, int clear, u_char *tag) 510 { 511 u_char cmd[12]; 512 u_char *buffer; 513 int result; 514 515 buffer = kzalloc(512, GFP_KERNEL); 516 if (!buffer) 517 return -ENOMEM; 518 519 DPRINTK("%s %s voltag: 0x%x => \"%s\"\n", 520 clear ? "clear" : "set", 521 alternate ? "alternate" : "primary", 522 elem, tag); 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; 529 cmd[5] = clear 530 ? (alternate ? 0x0d : 0x0c) 531 : (alternate ? 0x0b : 0x0a); 532 533 cmd[9] = 255; 534 535 memcpy(buffer,tag,32); 536 ch_check_voltag(buffer); 537 538 result = ch_do_scsi(ch, cmd, 12, buffer, 256, REQ_OP_DRV_OUT); 539 kfree(buffer); 540 return result; 541 } 542 543 static int ch_gstatus(scsi_changer *ch, int type, unsigned char __user *dest) 544 { 545 int retval = 0; 546 u_char data[16]; 547 unsigned int i; 548 549 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)) { 553 retval = -EIO; 554 break; 555 } 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", 559 ch->firsts[type]+i, 560 (int)data[4],(int)data[5]); 561 retval = ch_read_element_status 562 (ch, ch->firsts[type]+i,data); 563 if (0 != retval) 564 break; 565 } 566 mutex_unlock(&ch->lock); 567 return retval; 568 } 569 570 /* ------------------------------------------------------------------------ */ 571 572 static void ch_destroy(struct kref *ref) 573 { 574 scsi_changer *ch = container_of(ref, scsi_changer, ref); 575 576 ch->device = NULL; 577 kfree(ch->dt); 578 kfree(ch); 579 } 580 581 static int 582 ch_release(struct inode *inode, struct file *file) 583 { 584 scsi_changer *ch = file->private_data; 585 586 scsi_device_put(ch->device); 587 file->private_data = NULL; 588 kref_put(&ch->ref, ch_destroy); 589 return 0; 590 } 591 592 static int 593 ch_open(struct inode *inode, struct file *file) 594 { 595 scsi_changer *ch; 596 int minor = iminor(inode); 597 598 spin_lock(&ch_index_lock); 599 ch = idr_find(&ch_index_idr, minor); 600 601 if (ch == NULL || !kref_get_unless_zero(&ch->ref)) { 602 spin_unlock(&ch_index_lock); 603 return -ENXIO; 604 } 605 spin_unlock(&ch_index_lock); 606 if (scsi_device_get(ch->device)) { 607 kref_put(&ch->ref, ch_destroy); 608 return -ENXIO; 609 } 610 /* Synchronize with ch_probe() */ 611 mutex_lock(&ch->lock); 612 file->private_data = ch; 613 mutex_unlock(&ch->lock); 614 return 0; 615 } 616 617 static int 618 ch_checkrange(scsi_changer *ch, unsigned int type, unsigned int unit) 619 { 620 if (type >= CH_TYPES || unit >= ch->counts[type]) 621 return -1; 622 return 0; 623 } 624 625 struct changer_element_status32 { 626 int ces_type; 627 compat_uptr_t ces_data; 628 }; 629 #define CHIOGSTATUS32 _IOW('c', 8, struct changer_element_status32) 630 631 static long ch_ioctl(struct file *file, 632 unsigned int cmd, unsigned long arg) 633 { 634 scsi_changer *ch = file->private_data; 635 int retval; 636 void __user *argp = (void __user *)arg; 637 638 retval = scsi_ioctl_block_when_processing_errors(ch->device, cmd, 639 file->f_flags & O_NDELAY); 640 if (retval) 641 return retval; 642 643 switch (cmd) { 644 case CHIOGPARAMS: 645 { 646 struct changer_params params; 647 648 params.cp_curpicker = 0; 649 params.cp_npickers = ch->counts[CHET_MT]; 650 params.cp_nslots = ch->counts[CHET_ST]; 651 params.cp_nportals = ch->counts[CHET_IE]; 652 params.cp_ndrives = ch->counts[CHET_DT]; 653 654 if (copy_to_user(argp, ¶ms, sizeof(params))) 655 return -EFAULT; 656 return 0; 657 } 658 case CHIOGVPARAMS: 659 { 660 struct changer_vendor_params vparams; 661 662 memset(&vparams,0,sizeof(vparams)); 663 if (ch->counts[CHET_V1]) { 664 vparams.cvp_n1 = ch->counts[CHET_V1]; 665 strscpy(vparams.cvp_label1, vendor_labels[0], 666 sizeof(vparams.cvp_label1)); 667 } 668 if (ch->counts[CHET_V2]) { 669 vparams.cvp_n2 = ch->counts[CHET_V2]; 670 strscpy(vparams.cvp_label2, vendor_labels[1], 671 sizeof(vparams.cvp_label2)); 672 } 673 if (ch->counts[CHET_V3]) { 674 vparams.cvp_n3 = ch->counts[CHET_V3]; 675 strscpy(vparams.cvp_label3, vendor_labels[2], 676 sizeof(vparams.cvp_label3)); 677 } 678 if (ch->counts[CHET_V4]) { 679 vparams.cvp_n4 = ch->counts[CHET_V4]; 680 strscpy(vparams.cvp_label4, vendor_labels[3], 681 sizeof(vparams.cvp_label4)); 682 } 683 if (copy_to_user(argp, &vparams, sizeof(vparams))) 684 return -EFAULT; 685 return 0; 686 } 687 688 case CHIOPOSITION: 689 { 690 struct changer_position pos; 691 692 if (copy_from_user(&pos, argp, sizeof (pos))) 693 return -EFAULT; 694 695 if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) { 696 DPRINTK("CHIOPOSITION: invalid parameter\n"); 697 return -EBADSLT; 698 } 699 mutex_lock(&ch->lock); 700 retval = ch_position(ch,0, 701 ch->firsts[pos.cp_type] + pos.cp_unit, 702 pos.cp_flags & CP_INVERT); 703 mutex_unlock(&ch->lock); 704 return retval; 705 } 706 707 case CHIOMOVE: 708 { 709 struct changer_move mv; 710 711 if (copy_from_user(&mv, argp, sizeof (mv))) 712 return -EFAULT; 713 714 if (0 != ch_checkrange(ch, mv.cm_fromtype, mv.cm_fromunit) || 715 0 != ch_checkrange(ch, mv.cm_totype, mv.cm_tounit )) { 716 DPRINTK("CHIOMOVE: invalid parameter\n"); 717 return -EBADSLT; 718 } 719 720 mutex_lock(&ch->lock); 721 retval = ch_move(ch,0, 722 ch->firsts[mv.cm_fromtype] + mv.cm_fromunit, 723 ch->firsts[mv.cm_totype] + mv.cm_tounit, 724 mv.cm_flags & CM_INVERT); 725 mutex_unlock(&ch->lock); 726 return retval; 727 } 728 729 case CHIOEXCHANGE: 730 { 731 struct changer_exchange mv; 732 733 if (copy_from_user(&mv, argp, sizeof (mv))) 734 return -EFAULT; 735 736 if (0 != ch_checkrange(ch, mv.ce_srctype, mv.ce_srcunit ) || 737 0 != ch_checkrange(ch, mv.ce_fdsttype, mv.ce_fdstunit) || 738 0 != ch_checkrange(ch, mv.ce_sdsttype, mv.ce_sdstunit)) { 739 DPRINTK("CHIOEXCHANGE: invalid parameter\n"); 740 return -EBADSLT; 741 } 742 743 mutex_lock(&ch->lock); 744 retval = ch_exchange 745 (ch,0, 746 ch->firsts[mv.ce_srctype] + mv.ce_srcunit, 747 ch->firsts[mv.ce_fdsttype] + mv.ce_fdstunit, 748 ch->firsts[mv.ce_sdsttype] + mv.ce_sdstunit, 749 mv.ce_flags & CE_INVERT1, mv.ce_flags & CE_INVERT2); 750 mutex_unlock(&ch->lock); 751 return retval; 752 } 753 754 case CHIOGSTATUS: 755 { 756 struct changer_element_status ces; 757 758 if (copy_from_user(&ces, argp, sizeof (ces))) 759 return -EFAULT; 760 if (ces.ces_type < 0 || ces.ces_type >= CH_TYPES) 761 return -EINVAL; 762 763 return ch_gstatus(ch, ces.ces_type, ces.ces_data); 764 } 765 #ifdef CONFIG_COMPAT 766 case CHIOGSTATUS32: 767 { 768 struct changer_element_status32 ces32; 769 770 if (copy_from_user(&ces32, argp, sizeof(ces32))) 771 return -EFAULT; 772 if (ces32.ces_type < 0 || ces32.ces_type >= CH_TYPES) 773 return -EINVAL; 774 775 return ch_gstatus(ch, ces32.ces_type, 776 compat_ptr(ces32.ces_data)); 777 } 778 #endif 779 case CHIOGELEM: 780 { 781 struct changer_get_element cge; 782 u_char ch_cmd[12]; 783 u_char *buffer; 784 unsigned int elem; 785 int result,i; 786 787 if (copy_from_user(&cge, argp, sizeof (cge))) 788 return -EFAULT; 789 790 if (0 != ch_checkrange(ch, cge.cge_type, cge.cge_unit)) 791 return -EINVAL; 792 elem = ch->firsts[cge.cge_type] + cge.cge_unit; 793 794 buffer = kmalloc(512, GFP_KERNEL); 795 if (!buffer) 796 return -ENOMEM; 797 mutex_lock(&ch->lock); 798 799 voltag_retry: 800 memset(ch_cmd, 0, sizeof(ch_cmd)); 801 ch_cmd[0] = READ_ELEMENT_STATUS; 802 ch_cmd[1] = ((ch->device->lun & 0x7) << 5) | 803 (ch->voltags ? 0x10 : 0) | 804 ch_elem_to_typecode(ch,elem); 805 ch_cmd[2] = (elem >> 8) & 0xff; 806 ch_cmd[3] = elem & 0xff; 807 ch_cmd[5] = 1; 808 ch_cmd[9] = 255; 809 810 result = ch_do_scsi(ch, ch_cmd, 12, buffer, 256, REQ_OP_DRV_IN); 811 if (!result) { 812 cge.cge_status = buffer[18]; 813 cge.cge_flags = 0; 814 if (buffer[18] & CESTATUS_EXCEPT) { 815 cge.cge_errno = EIO; 816 } 817 if (buffer[25] & 0x80) { 818 cge.cge_flags |= CGE_SRC; 819 if (buffer[25] & 0x40) 820 cge.cge_flags |= CGE_INVERT; 821 elem = (buffer[26]<<8) | buffer[27]; 822 for (i = 0; i < 4; i++) { 823 if (elem >= ch->firsts[i] && 824 elem < ch->firsts[i] + ch->counts[i]) { 825 cge.cge_srctype = i; 826 cge.cge_srcunit = elem-ch->firsts[i]; 827 } 828 } 829 } 830 if ((buffer[22] & 0x30) == 0x30) { 831 cge.cge_flags |= CGE_IDLUN; 832 cge.cge_id = buffer[23]; 833 cge.cge_lun = buffer[22] & 7; 834 } 835 if (buffer[9] & 0x80) { 836 cge.cge_flags |= CGE_PVOLTAG; 837 memcpy(cge.cge_pvoltag,buffer+28,36); 838 } 839 if (buffer[9] & 0x40) { 840 cge.cge_flags |= CGE_AVOLTAG; 841 memcpy(cge.cge_avoltag,buffer+64,36); 842 } 843 } else if (ch->voltags) { 844 ch->voltags = 0; 845 VPRINTK(KERN_INFO, "device has no volume tag support\n"); 846 goto voltag_retry; 847 } 848 kfree(buffer); 849 mutex_unlock(&ch->lock); 850 851 if (copy_to_user(argp, &cge, sizeof (cge))) 852 return -EFAULT; 853 return result; 854 } 855 856 case CHIOINITELEM: 857 { 858 mutex_lock(&ch->lock); 859 retval = ch_init_elem(ch); 860 mutex_unlock(&ch->lock); 861 return retval; 862 } 863 864 case CHIOSVOLTAG: 865 { 866 struct changer_set_voltag csv; 867 int elem; 868 869 if (copy_from_user(&csv, argp, sizeof(csv))) 870 return -EFAULT; 871 872 if (0 != ch_checkrange(ch, csv.csv_type, csv.csv_unit)) { 873 DPRINTK("CHIOSVOLTAG: invalid parameter\n"); 874 return -EBADSLT; 875 } 876 elem = ch->firsts[csv.csv_type] + csv.csv_unit; 877 mutex_lock(&ch->lock); 878 retval = ch_set_voltag(ch, elem, 879 csv.csv_flags & CSV_AVOLTAG, 880 csv.csv_flags & CSV_CLEARTAG, 881 csv.csv_voltag); 882 mutex_unlock(&ch->lock); 883 return retval; 884 } 885 886 default: 887 return scsi_ioctl(ch->device, file->f_mode & FMODE_WRITE, cmd, 888 argp); 889 890 } 891 } 892 893 /* ------------------------------------------------------------------------ */ 894 895 static int ch_probe(struct device *dev) 896 { 897 struct scsi_device *sd = to_scsi_device(dev); 898 struct device *class_dev; 899 int ret; 900 scsi_changer *ch; 901 902 if (sd->type != TYPE_MEDIUM_CHANGER) 903 return -ENODEV; 904 905 ch = kzalloc(sizeof(*ch), GFP_KERNEL); 906 if (NULL == ch) 907 return -ENOMEM; 908 909 idr_preload(GFP_KERNEL); 910 spin_lock(&ch_index_lock); 911 ret = idr_alloc(&ch_index_idr, ch, 0, CH_MAX_DEVS + 1, GFP_NOWAIT); 912 spin_unlock(&ch_index_lock); 913 idr_preload_end(); 914 915 if (ret < 0) { 916 if (ret == -ENOSPC) 917 ret = -ENODEV; 918 goto free_ch; 919 } 920 921 ch->minor = ret; 922 sprintf(ch->name,"ch%d",ch->minor); 923 ret = scsi_device_get(sd); 924 if (ret) { 925 sdev_printk(KERN_WARNING, sd, "ch%d: failed to get device\n", 926 ch->minor); 927 goto remove_idr; 928 } 929 930 mutex_init(&ch->lock); 931 kref_init(&ch->ref); 932 ch->device = sd; 933 class_dev = device_create(ch_sysfs_class, dev, 934 MKDEV(SCSI_CHANGER_MAJOR, ch->minor), ch, 935 "s%s", ch->name); 936 if (IS_ERR(class_dev)) { 937 sdev_printk(KERN_WARNING, sd, "ch%d: device_create failed\n", 938 ch->minor); 939 ret = PTR_ERR(class_dev); 940 goto put_device; 941 } 942 943 mutex_lock(&ch->lock); 944 ret = ch_readconfig(ch); 945 if (ret) { 946 mutex_unlock(&ch->lock); 947 goto destroy_dev; 948 } 949 if (init) 950 ch_init_elem(ch); 951 952 mutex_unlock(&ch->lock); 953 dev_set_drvdata(dev, ch); 954 sdev_printk(KERN_INFO, sd, "Attached scsi changer %s\n", ch->name); 955 956 return 0; 957 destroy_dev: 958 device_destroy(ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR, ch->minor)); 959 put_device: 960 scsi_device_put(sd); 961 remove_idr: 962 idr_remove(&ch_index_idr, ch->minor); 963 free_ch: 964 kfree(ch); 965 return ret; 966 } 967 968 static int ch_remove(struct device *dev) 969 { 970 scsi_changer *ch = dev_get_drvdata(dev); 971 972 spin_lock(&ch_index_lock); 973 idr_remove(&ch_index_idr, ch->minor); 974 dev_set_drvdata(dev, NULL); 975 spin_unlock(&ch_index_lock); 976 977 device_destroy(ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR,ch->minor)); 978 scsi_device_put(ch->device); 979 kref_put(&ch->ref, ch_destroy); 980 return 0; 981 } 982 983 static struct scsi_driver ch_template = { 984 .gendrv = { 985 .name = "ch", 986 .owner = THIS_MODULE, 987 .probe = ch_probe, 988 .remove = ch_remove, 989 }, 990 }; 991 992 static const struct file_operations changer_fops = { 993 .owner = THIS_MODULE, 994 .open = ch_open, 995 .release = ch_release, 996 .unlocked_ioctl = ch_ioctl, 997 .compat_ioctl = compat_ptr_ioctl, 998 .llseek = noop_llseek, 999 }; 1000 1001 static int __init init_ch_module(void) 1002 { 1003 int rc; 1004 1005 printk(KERN_INFO "SCSI Media Changer driver v" VERSION " \n"); 1006 ch_sysfs_class = class_create("scsi_changer"); 1007 if (IS_ERR(ch_sysfs_class)) { 1008 rc = PTR_ERR(ch_sysfs_class); 1009 return rc; 1010 } 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_destroy(ch_sysfs_class); 1026 return rc; 1027 } 1028 1029 static void __exit exit_ch_module(void) 1030 { 1031 scsi_unregister_driver(&ch_template.gendrv); 1032 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch"); 1033 class_destroy(ch_sysfs_class); 1034 idr_destroy(&ch_index_idr); 1035 } 1036 1037 module_init(init_ch_module); 1038 module_exit(exit_ch_module); 1039