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 const struct class ch_sysfs_class = { 106 .name = "scsi_changer", 107 }; 108 109 typedef 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; 121 122 static DEFINE_IDR(ch_index_idr); 123 static DEFINE_SPINLOCK(ch_index_lock); 124 125 static 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 for 132 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 /* ------------------------------------------------------------------- */ 164 165 static 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 } 185 186 static int 187 ch_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 /* ------------------------------------------------------------------------ */ 226 227 static int 228 ch_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 } 240 241 static int 242 ch_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 } 282 283 static int 284 ch_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 } 297 298 static int 299 ch_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_status 384 (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 /* ------------------------------------------------------------------------ */ 426 427 static int 428 ch_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 } 445 446 static int 447 ch_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 } 466 467 static int 468 ch_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 } 492 493 static void 494 ch_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 } 508 509 static int 510 ch_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] = clear 532 ? (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 } 544 545 static 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_status 554 (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_status 564 (ch, ch->firsts[type]+i,data); 565 if (0 != retval) 566 break; 567 } 568 mutex_unlock(&ch->lock); 569 return retval; 570 } 571 572 /* ------------------------------------------------------------------------ */ 573 574 static 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 } 582 583 static int 584 ch_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 } 593 594 static int 595 ch_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 } 618 619 static int 620 ch_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 } 626 627 struct changer_element_status32 { 628 int ces_type; 629 compat_uptr_t ces_data; 630 }; 631 #define CHIOGSTATUS32 _IOW('c', 8, struct changer_element_status32) 632 633 static 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_exchange 747 (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_COMPAT 768 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 #endif 781 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 /* ------------------------------------------------------------------------ */ 896 897 static 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; 959 destroy_dev: 960 device_destroy(&ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR, ch->minor)); 961 put_device: 962 scsi_device_put(sd); 963 remove_idr: 964 idr_remove(&ch_index_idr, ch->minor); 965 free_ch: 966 kfree(ch); 967 return ret; 968 } 969 970 static 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 } 984 985 static struct scsi_driver ch_template = { 986 .gendrv = { 987 .name = "ch", 988 .owner = THIS_MODULE, 989 .probe = ch_probe, 990 .remove = ch_remove, 991 }, 992 }; 993 994 static 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 1003 static 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 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_unregister(&ch_sysfs_class); 1034 idr_destroy(&ch_index_idr); 1035 } 1036 1037 module_init(init_ch_module); 1038 module_exit(exit_ch_module); 1039