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 u_int firsts[CH_TYPES]; 116 u_int counts[CH_TYPES]; 117 u_int voltags; 118 struct mutex lock; 119 } scsi_changer; 120 121 static DEFINE_IDR(ch_index_idr); 122 static DEFINE_SPINLOCK(ch_index_lock); 123 124 static const struct { 125 u8 sense_key; 126 u16 sense_code; 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_key = ILLEGAL_REQUEST, 133 .sense_code = INVALID_ELEMENT_ADDRESS, 134 .errno = EBADSLT, 135 },{ 136 .sense_key = ILLEGAL_REQUEST, 137 .sense_code = IMPORT_OR_EXPORT_ELEMENT_ACCESSED, 138 .errno = EBADE, 139 },{ 140 .sense_key = ILLEGAL_REQUEST, 141 .sense_code = MEDIUM_DESTINATION_ELEMENT_FULL, 142 .errno = EXFULL, 143 },{ 144 .sense_key = ILLEGAL_REQUEST, 145 .sense_code = MEDIUM_SOURCE_ELEMENT_EMPTY, 146 .errno = EBADE, 147 },{ 148 .sense_key = ILLEGAL_REQUEST, 149 .sense_code = INVALID_COMMAND_OP_CODE, 150 .errno = EBADRQC, 151 },{ 152 /* end of list */ 153 } 154 }; 155 156 /* ------------------------------------------------------------------- */ 157 158 static int ch_find_errno(struct scsi_sense_hdr *sshdr) 159 { 160 int i,errno = 0; 161 162 /* Check to see if additional sense information is available */ 163 if (scsi_sense_valid(sshdr) && scsi_sense_asc(sshdr) != 0) { 164 for (i = 0; ch_err[i].errno != 0; i++) { 165 if (ch_err[i].sense_key == sshdr->sense_key && 166 ch_err[i].sense_code == sshdr->sense_code) { 167 errno = -ch_err[i].errno; 168 break; 169 } 170 } 171 } 172 if (errno == 0) 173 errno = -EIO; 174 return errno; 175 } 176 177 static int 178 ch_do_scsi(scsi_changer *ch, unsigned char *cmd, int cmd_len, 179 void *buffer, unsigned int buflength, enum req_op op) 180 { 181 int errno = 0, timeout, result; 182 struct scsi_sense_hdr sshdr; 183 struct scsi_failure failure_defs[] = { 184 { 185 .sense_key = UNIT_ATTENTION, 186 .sense_code = SCMD_FAILURE_SENSE_CODE_ANY, 187 .allowed = 3, 188 .result = SAM_STAT_CHECK_CONDITION, 189 }, 190 {} 191 }; 192 struct scsi_failures failures = { 193 .failure_definitions = failure_defs, 194 }; 195 const struct scsi_exec_args exec_args = { 196 .sshdr = &sshdr, 197 .failures = &failures, 198 }; 199 200 timeout = (cmd[0] == INITIALIZE_ELEMENT_STATUS) 201 ? timeout_init : timeout_move; 202 203 result = scsi_execute_cmd(ch->device, cmd, op, buffer, buflength, 204 timeout * HZ, MAX_RETRIES, &exec_args); 205 if (result < 0) 206 return result; 207 if (scsi_sense_valid(&sshdr)) { 208 if (debug) 209 scsi_print_sense_hdr(ch->device, ch->name, &sshdr); 210 errno = ch_find_errno(&sshdr); 211 } 212 return errno; 213 } 214 215 /* ------------------------------------------------------------------------ */ 216 217 static int 218 ch_elem_to_typecode(scsi_changer *ch, u_int elem) 219 { 220 int i; 221 222 for (i = 0; i < CH_TYPES; i++) { 223 if (elem >= ch->firsts[i] && 224 elem < ch->firsts[i] + 225 ch->counts[i]) 226 return i+1; 227 } 228 return 0; 229 } 230 231 static int 232 ch_read_element_status(scsi_changer *ch, u_int elem, char *data) 233 { 234 u_char cmd[12]; 235 u_char *buffer; 236 int result; 237 238 buffer = kmalloc(512, GFP_KERNEL); 239 if(!buffer) 240 return -ENOMEM; 241 242 retry: 243 memset(cmd,0,sizeof(cmd)); 244 cmd[0] = READ_ELEMENT_STATUS; 245 cmd[1] = ((ch->device->lun & 0x7) << 5) | 246 (ch->voltags ? 0x10 : 0) | 247 ch_elem_to_typecode(ch,elem); 248 cmd[2] = (elem >> 8) & 0xff; 249 cmd[3] = elem & 0xff; 250 cmd[5] = 1; 251 cmd[9] = 255; 252 if (0 == (result = ch_do_scsi(ch, cmd, 12, 253 buffer, 256, REQ_OP_DRV_IN))) { 254 if (((buffer[16] << 8) | buffer[17]) != elem) { 255 DPRINTK("asked for element 0x%02x, got 0x%02x\n", 256 elem,(buffer[16] << 8) | buffer[17]); 257 kfree(buffer); 258 return -EIO; 259 } 260 memcpy(data,buffer+16,16); 261 } else { 262 if (ch->voltags) { 263 ch->voltags = 0; 264 VPRINTK(KERN_INFO, "device has no volume tag support\n"); 265 goto retry; 266 } 267 DPRINTK("READ ELEMENT STATUS for element 0x%x failed\n",elem); 268 } 269 kfree(buffer); 270 return result; 271 } 272 273 static int 274 ch_init_elem(scsi_changer *ch) 275 { 276 int err; 277 u_char cmd[6]; 278 279 VPRINTK(KERN_INFO, "INITIALIZE ELEMENT STATUS, may take some time ...\n"); 280 memset(cmd,0,sizeof(cmd)); 281 cmd[0] = INITIALIZE_ELEMENT_STATUS; 282 cmd[1] = (ch->device->lun & 0x7) << 5; 283 err = ch_do_scsi(ch, cmd, 6, NULL, 0, REQ_OP_DRV_IN); 284 VPRINTK(KERN_INFO, "... finished\n"); 285 return err; 286 } 287 288 static int 289 ch_readconfig(scsi_changer *ch) 290 { 291 u_char cmd[10], data[16]; 292 u_char *buffer; 293 int result,id,lun,i; 294 u_int elem; 295 296 buffer = kzalloc(512, GFP_KERNEL); 297 if (!buffer) 298 return -ENOMEM; 299 300 memset(cmd,0,sizeof(cmd)); 301 cmd[0] = MODE_SENSE; 302 cmd[1] = (ch->device->lun & 0x7) << 5; 303 cmd[2] = 0x1d; 304 cmd[4] = 255; 305 result = ch_do_scsi(ch, cmd, 10, buffer, 255, REQ_OP_DRV_IN); 306 if (0 != result) { 307 cmd[1] |= (1<<3); 308 result = ch_do_scsi(ch, cmd, 10, buffer, 255, REQ_OP_DRV_IN); 309 } 310 if (0 == result) { 311 ch->firsts[CHET_MT] = 312 (buffer[buffer[3]+ 6] << 8) | buffer[buffer[3]+ 7]; 313 ch->counts[CHET_MT] = 314 (buffer[buffer[3]+ 8] << 8) | buffer[buffer[3]+ 9]; 315 ch->firsts[CHET_ST] = 316 (buffer[buffer[3]+10] << 8) | buffer[buffer[3]+11]; 317 ch->counts[CHET_ST] = 318 (buffer[buffer[3]+12] << 8) | buffer[buffer[3]+13]; 319 ch->firsts[CHET_IE] = 320 (buffer[buffer[3]+14] << 8) | buffer[buffer[3]+15]; 321 ch->counts[CHET_IE] = 322 (buffer[buffer[3]+16] << 8) | buffer[buffer[3]+17]; 323 ch->firsts[CHET_DT] = 324 (buffer[buffer[3]+18] << 8) | buffer[buffer[3]+19]; 325 ch->counts[CHET_DT] = 326 (buffer[buffer[3]+20] << 8) | buffer[buffer[3]+21]; 327 VPRINTK(KERN_INFO, "type #1 (mt): 0x%x+%d [medium transport]\n", 328 ch->firsts[CHET_MT], 329 ch->counts[CHET_MT]); 330 VPRINTK(KERN_INFO, "type #2 (st): 0x%x+%d [storage]\n", 331 ch->firsts[CHET_ST], 332 ch->counts[CHET_ST]); 333 VPRINTK(KERN_INFO, "type #3 (ie): 0x%x+%d [import/export]\n", 334 ch->firsts[CHET_IE], 335 ch->counts[CHET_IE]); 336 VPRINTK(KERN_INFO, "type #4 (dt): 0x%x+%d [data transfer]\n", 337 ch->firsts[CHET_DT], 338 ch->counts[CHET_DT]); 339 } else { 340 VPRINTK(KERN_INFO, "reading element address assignment page failed!\n"); 341 } 342 343 /* vendor specific element types */ 344 for (i = 0; i < 4; i++) { 345 if (0 == vendor_counts[i]) 346 continue; 347 if (NULL == vendor_labels[i]) 348 continue; 349 ch->firsts[CHET_V1+i] = vendor_firsts[i]; 350 ch->counts[CHET_V1+i] = vendor_counts[i]; 351 VPRINTK(KERN_INFO, "type #%d (v%d): 0x%x+%d [%s, vendor specific]\n", 352 i+5,i+1,vendor_firsts[i],vendor_counts[i], 353 vendor_labels[i]); 354 } 355 356 /* report the devices of the data transfer elements */ 357 for (elem = 0; elem < ch->counts[CHET_DT]; elem++) { 358 struct scsi_device *sdev; 359 360 id = -1; 361 lun = 0; 362 if (elem < CH_DT_MAX && -1 != dt_id[elem]) { 363 id = dt_id[elem]; 364 lun = dt_lun[elem]; 365 VPRINTK(KERN_INFO, "dt 0x%x: [insmod option] ", 366 elem+ch->firsts[CHET_DT]); 367 } else if (0 != ch_read_element_status 368 (ch,elem+ch->firsts[CHET_DT],data)) { 369 VPRINTK(KERN_INFO, "dt 0x%x: READ ELEMENT STATUS failed\n", 370 elem+ch->firsts[CHET_DT]); 371 } else { 372 VPRINTK(KERN_INFO, "dt 0x%x: ",elem+ch->firsts[CHET_DT]); 373 if (data[6] & 0x80) { 374 VPRINTK(KERN_CONT, "not this SCSI bus\n"); 375 } else if (0 == (data[6] & 0x30)) { 376 VPRINTK(KERN_CONT, "ID/LUN unknown\n"); 377 } else { 378 id = ch->device->id; 379 lun = 0; 380 if (data[6] & 0x20) id = data[7]; 381 if (data[6] & 0x10) lun = data[6] & 7; 382 } 383 } 384 if (-1 != id) { 385 VPRINTK(KERN_CONT, "ID %i, LUN %i, ",id,lun); 386 sdev = scsi_device_lookup(ch->device->host, 387 ch->device->channel, 388 id, lun); 389 if (!sdev) { 390 /* should not happen */ 391 VPRINTK(KERN_CONT, "Huh? device not found!\n"); 392 } else { 393 VPRINTK(KERN_CONT, "name: %8.8s %16.16s %4.4s\n", 394 sdev->vendor, sdev->model, sdev->rev); 395 scsi_device_put(sdev); 396 } 397 } 398 } 399 ch->voltags = 1; 400 kfree(buffer); 401 402 return 0; 403 } 404 405 /* ------------------------------------------------------------------------ */ 406 407 static int 408 ch_position(scsi_changer *ch, u_int trans, u_int elem, int rotate) 409 { 410 u_char cmd[10]; 411 412 DPRINTK("position: 0x%x\n",elem); 413 if (0 == trans) 414 trans = ch->firsts[CHET_MT]; 415 memset(cmd,0,sizeof(cmd)); 416 cmd[0] = POSITION_TO_ELEMENT; 417 cmd[1] = (ch->device->lun & 0x7) << 5; 418 cmd[2] = (trans >> 8) & 0xff; 419 cmd[3] = trans & 0xff; 420 cmd[4] = (elem >> 8) & 0xff; 421 cmd[5] = elem & 0xff; 422 cmd[8] = rotate ? 1 : 0; 423 return ch_do_scsi(ch, cmd, 10, NULL, 0, REQ_OP_DRV_IN); 424 } 425 426 static int 427 ch_move(scsi_changer *ch, u_int trans, u_int src, u_int dest, int rotate) 428 { 429 u_char cmd[12]; 430 431 DPRINTK("move: 0x%x => 0x%x\n",src,dest); 432 if (0 == trans) 433 trans = ch->firsts[CHET_MT]; 434 memset(cmd,0,sizeof(cmd)); 435 cmd[0] = MOVE_MEDIUM; 436 cmd[1] = (ch->device->lun & 0x7) << 5; 437 cmd[2] = (trans >> 8) & 0xff; 438 cmd[3] = trans & 0xff; 439 cmd[4] = (src >> 8) & 0xff; 440 cmd[5] = src & 0xff; 441 cmd[6] = (dest >> 8) & 0xff; 442 cmd[7] = dest & 0xff; 443 cmd[10] = rotate ? 1 : 0; 444 return ch_do_scsi(ch, cmd, 12, NULL, 0, REQ_OP_DRV_IN); 445 } 446 447 static int 448 ch_exchange(scsi_changer *ch, u_int trans, u_int src, 449 u_int dest1, u_int dest2, int rotate1, int rotate2) 450 { 451 u_char cmd[12]; 452 453 DPRINTK("exchange: 0x%x => 0x%x => 0x%x\n", 454 src,dest1,dest2); 455 if (0 == trans) 456 trans = ch->firsts[CHET_MT]; 457 memset(cmd,0,sizeof(cmd)); 458 cmd[0] = EXCHANGE_MEDIUM; 459 cmd[1] = (ch->device->lun & 0x7) << 5; 460 cmd[2] = (trans >> 8) & 0xff; 461 cmd[3] = trans & 0xff; 462 cmd[4] = (src >> 8) & 0xff; 463 cmd[5] = src & 0xff; 464 cmd[6] = (dest1 >> 8) & 0xff; 465 cmd[7] = dest1 & 0xff; 466 cmd[8] = (dest2 >> 8) & 0xff; 467 cmd[9] = dest2 & 0xff; 468 cmd[10] = (rotate1 ? 1 : 0) | (rotate2 ? 2 : 0); 469 470 return ch_do_scsi(ch, cmd, 12, NULL, 0, REQ_OP_DRV_IN); 471 } 472 473 static void 474 ch_check_voltag(char *tag) 475 { 476 int i; 477 478 for (i = 0; i < 32; i++) { 479 /* restrict to ascii */ 480 if (tag[i] >= 0x7f || tag[i] < 0x20) 481 tag[i] = ' '; 482 /* don't allow search wildcards */ 483 if (tag[i] == '?' || 484 tag[i] == '*') 485 tag[i] = ' '; 486 } 487 } 488 489 static int 490 ch_set_voltag(scsi_changer *ch, u_int elem, 491 int alternate, int clear, u_char *tag) 492 { 493 u_char cmd[12]; 494 u_char *buffer; 495 int result; 496 497 buffer = kzalloc(512, GFP_KERNEL); 498 if (!buffer) 499 return -ENOMEM; 500 501 DPRINTK("%s %s voltag: 0x%x => \"%s\"\n", 502 clear ? "clear" : "set", 503 alternate ? "alternate" : "primary", 504 elem, tag); 505 memset(cmd,0,sizeof(cmd)); 506 cmd[0] = SEND_VOLUME_TAG; 507 cmd[1] = ((ch->device->lun & 0x7) << 5) | 508 ch_elem_to_typecode(ch,elem); 509 cmd[2] = (elem >> 8) & 0xff; 510 cmd[3] = elem & 0xff; 511 cmd[5] = clear 512 ? (alternate ? 0x0d : 0x0c) 513 : (alternate ? 0x0b : 0x0a); 514 515 cmd[9] = 255; 516 517 memcpy(buffer,tag,32); 518 ch_check_voltag(buffer); 519 520 result = ch_do_scsi(ch, cmd, 12, buffer, 256, REQ_OP_DRV_OUT); 521 kfree(buffer); 522 return result; 523 } 524 525 static int ch_gstatus(scsi_changer *ch, int type, unsigned char __user *dest) 526 { 527 int retval = 0; 528 u_char data[16]; 529 unsigned int i; 530 531 mutex_lock(&ch->lock); 532 for (i = 0; i < ch->counts[type]; i++) { 533 if (0 != ch_read_element_status 534 (ch, ch->firsts[type]+i,data)) { 535 retval = -EIO; 536 break; 537 } 538 put_user(data[2], dest+i); 539 if (data[2] & CESTATUS_EXCEPT) 540 VPRINTK(KERN_INFO, "element 0x%x: asc=0x%x, ascq=0x%x\n", 541 ch->firsts[type]+i, 542 (int)data[4],(int)data[5]); 543 retval = ch_read_element_status 544 (ch, ch->firsts[type]+i,data); 545 if (0 != retval) 546 break; 547 } 548 mutex_unlock(&ch->lock); 549 return retval; 550 } 551 552 /* ------------------------------------------------------------------------ */ 553 554 static void ch_destroy(struct kref *ref) 555 { 556 scsi_changer *ch = container_of(ref, scsi_changer, ref); 557 558 ch->device = NULL; 559 kfree(ch); 560 } 561 562 static int 563 ch_release(struct inode *inode, struct file *file) 564 { 565 scsi_changer *ch = file->private_data; 566 567 scsi_device_put(ch->device); 568 file->private_data = NULL; 569 kref_put(&ch->ref, ch_destroy); 570 return 0; 571 } 572 573 static int 574 ch_open(struct inode *inode, struct file *file) 575 { 576 scsi_changer *ch; 577 int minor = iminor(inode); 578 579 spin_lock(&ch_index_lock); 580 ch = idr_find(&ch_index_idr, minor); 581 582 if (ch == NULL || !kref_get_unless_zero(&ch->ref)) { 583 spin_unlock(&ch_index_lock); 584 return -ENXIO; 585 } 586 spin_unlock(&ch_index_lock); 587 if (scsi_device_get(ch->device)) { 588 kref_put(&ch->ref, ch_destroy); 589 return -ENXIO; 590 } 591 /* Synchronize with ch_probe() */ 592 mutex_lock(&ch->lock); 593 file->private_data = ch; 594 mutex_unlock(&ch->lock); 595 return 0; 596 } 597 598 static int 599 ch_checkrange(scsi_changer *ch, unsigned int type, unsigned int unit) 600 { 601 if (type >= CH_TYPES || unit >= ch->counts[type]) 602 return -1; 603 return 0; 604 } 605 606 struct changer_element_status32 { 607 int ces_type; 608 compat_uptr_t ces_data; 609 }; 610 #define CHIOGSTATUS32 _IOW('c', 8, struct changer_element_status32) 611 612 static long ch_ioctl(struct file *file, 613 unsigned int cmd, unsigned long arg) 614 { 615 scsi_changer *ch = file->private_data; 616 int retval; 617 void __user *argp = (void __user *)arg; 618 619 retval = scsi_ioctl_block_when_processing_errors(ch->device, cmd, 620 file->f_flags & O_NDELAY); 621 if (retval) 622 return retval; 623 624 switch (cmd) { 625 case CHIOGPARAMS: 626 { 627 struct changer_params params; 628 629 params.cp_curpicker = 0; 630 params.cp_npickers = ch->counts[CHET_MT]; 631 params.cp_nslots = ch->counts[CHET_ST]; 632 params.cp_nportals = ch->counts[CHET_IE]; 633 params.cp_ndrives = ch->counts[CHET_DT]; 634 635 if (copy_to_user(argp, ¶ms, sizeof(params))) 636 return -EFAULT; 637 return 0; 638 } 639 case CHIOGVPARAMS: 640 { 641 struct changer_vendor_params vparams; 642 643 memset(&vparams,0,sizeof(vparams)); 644 if (ch->counts[CHET_V1]) { 645 vparams.cvp_n1 = ch->counts[CHET_V1]; 646 strscpy(vparams.cvp_label1, vendor_labels[0], 647 sizeof(vparams.cvp_label1)); 648 } 649 if (ch->counts[CHET_V2]) { 650 vparams.cvp_n2 = ch->counts[CHET_V2]; 651 strscpy(vparams.cvp_label2, vendor_labels[1], 652 sizeof(vparams.cvp_label2)); 653 } 654 if (ch->counts[CHET_V3]) { 655 vparams.cvp_n3 = ch->counts[CHET_V3]; 656 strscpy(vparams.cvp_label3, vendor_labels[2], 657 sizeof(vparams.cvp_label3)); 658 } 659 if (ch->counts[CHET_V4]) { 660 vparams.cvp_n4 = ch->counts[CHET_V4]; 661 strscpy(vparams.cvp_label4, vendor_labels[3], 662 sizeof(vparams.cvp_label4)); 663 } 664 if (copy_to_user(argp, &vparams, sizeof(vparams))) 665 return -EFAULT; 666 return 0; 667 } 668 669 case CHIOPOSITION: 670 { 671 struct changer_position pos; 672 673 if (copy_from_user(&pos, argp, sizeof (pos))) 674 return -EFAULT; 675 676 if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) { 677 DPRINTK("CHIOPOSITION: invalid parameter\n"); 678 return -EBADSLT; 679 } 680 mutex_lock(&ch->lock); 681 retval = ch_position(ch,0, 682 ch->firsts[pos.cp_type] + pos.cp_unit, 683 pos.cp_flags & CP_INVERT); 684 mutex_unlock(&ch->lock); 685 return retval; 686 } 687 688 case CHIOMOVE: 689 { 690 struct changer_move mv; 691 692 if (copy_from_user(&mv, argp, sizeof (mv))) 693 return -EFAULT; 694 695 if (0 != ch_checkrange(ch, mv.cm_fromtype, mv.cm_fromunit) || 696 0 != ch_checkrange(ch, mv.cm_totype, mv.cm_tounit )) { 697 DPRINTK("CHIOMOVE: invalid parameter\n"); 698 return -EBADSLT; 699 } 700 701 mutex_lock(&ch->lock); 702 retval = ch_move(ch,0, 703 ch->firsts[mv.cm_fromtype] + mv.cm_fromunit, 704 ch->firsts[mv.cm_totype] + mv.cm_tounit, 705 mv.cm_flags & CM_INVERT); 706 mutex_unlock(&ch->lock); 707 return retval; 708 } 709 710 case CHIOEXCHANGE: 711 { 712 struct changer_exchange mv; 713 714 if (copy_from_user(&mv, argp, sizeof (mv))) 715 return -EFAULT; 716 717 if (0 != ch_checkrange(ch, mv.ce_srctype, mv.ce_srcunit ) || 718 0 != ch_checkrange(ch, mv.ce_fdsttype, mv.ce_fdstunit) || 719 0 != ch_checkrange(ch, mv.ce_sdsttype, mv.ce_sdstunit)) { 720 DPRINTK("CHIOEXCHANGE: invalid parameter\n"); 721 return -EBADSLT; 722 } 723 724 mutex_lock(&ch->lock); 725 retval = ch_exchange 726 (ch,0, 727 ch->firsts[mv.ce_srctype] + mv.ce_srcunit, 728 ch->firsts[mv.ce_fdsttype] + mv.ce_fdstunit, 729 ch->firsts[mv.ce_sdsttype] + mv.ce_sdstunit, 730 mv.ce_flags & CE_INVERT1, mv.ce_flags & CE_INVERT2); 731 mutex_unlock(&ch->lock); 732 return retval; 733 } 734 735 case CHIOGSTATUS: 736 { 737 struct changer_element_status ces; 738 739 if (copy_from_user(&ces, argp, sizeof (ces))) 740 return -EFAULT; 741 if (ces.ces_type < 0 || ces.ces_type >= CH_TYPES) 742 return -EINVAL; 743 744 return ch_gstatus(ch, ces.ces_type, ces.ces_data); 745 } 746 #ifdef CONFIG_COMPAT 747 case CHIOGSTATUS32: 748 { 749 struct changer_element_status32 ces32; 750 751 if (copy_from_user(&ces32, argp, sizeof(ces32))) 752 return -EFAULT; 753 if (ces32.ces_type < 0 || ces32.ces_type >= CH_TYPES) 754 return -EINVAL; 755 756 return ch_gstatus(ch, ces32.ces_type, 757 compat_ptr(ces32.ces_data)); 758 } 759 #endif 760 case CHIOGELEM: 761 { 762 struct changer_get_element cge; 763 u_char ch_cmd[12]; 764 u_char *buffer; 765 unsigned int elem; 766 int result,i; 767 768 if (copy_from_user(&cge, argp, sizeof (cge))) 769 return -EFAULT; 770 771 if (0 != ch_checkrange(ch, cge.cge_type, cge.cge_unit)) 772 return -EINVAL; 773 elem = ch->firsts[cge.cge_type] + cge.cge_unit; 774 775 buffer = kmalloc(512, GFP_KERNEL); 776 if (!buffer) 777 return -ENOMEM; 778 mutex_lock(&ch->lock); 779 780 voltag_retry: 781 memset(ch_cmd, 0, sizeof(ch_cmd)); 782 ch_cmd[0] = READ_ELEMENT_STATUS; 783 ch_cmd[1] = ((ch->device->lun & 0x7) << 5) | 784 (ch->voltags ? 0x10 : 0) | 785 ch_elem_to_typecode(ch,elem); 786 ch_cmd[2] = (elem >> 8) & 0xff; 787 ch_cmd[3] = elem & 0xff; 788 ch_cmd[5] = 1; 789 ch_cmd[9] = 255; 790 791 result = ch_do_scsi(ch, ch_cmd, 12, buffer, 256, REQ_OP_DRV_IN); 792 if (!result) { 793 cge.cge_status = buffer[18]; 794 cge.cge_flags = 0; 795 if (buffer[18] & CESTATUS_EXCEPT) { 796 cge.cge_errno = EIO; 797 } 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]) { 806 cge.cge_srctype = i; 807 cge.cge_srcunit = elem-ch->firsts[i]; 808 } 809 } 810 } 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; 815 } 816 if (buffer[9] & 0x80) { 817 cge.cge_flags |= CGE_PVOLTAG; 818 memcpy(cge.cge_pvoltag,buffer+28,36); 819 } 820 if (buffer[9] & 0x40) { 821 cge.cge_flags |= CGE_AVOLTAG; 822 memcpy(cge.cge_avoltag,buffer+64,36); 823 } 824 } else if (ch->voltags) { 825 ch->voltags = 0; 826 VPRINTK(KERN_INFO, "device has no volume tag support\n"); 827 goto voltag_retry; 828 } 829 kfree(buffer); 830 mutex_unlock(&ch->lock); 831 832 if (copy_to_user(argp, &cge, sizeof (cge))) 833 return -EFAULT; 834 return result; 835 } 836 837 case CHIOINITELEM: 838 { 839 mutex_lock(&ch->lock); 840 retval = ch_init_elem(ch); 841 mutex_unlock(&ch->lock); 842 return retval; 843 } 844 845 case CHIOSVOLTAG: 846 { 847 struct changer_set_voltag csv; 848 int elem; 849 850 if (copy_from_user(&csv, argp, sizeof(csv))) 851 return -EFAULT; 852 853 if (0 != ch_checkrange(ch, csv.csv_type, csv.csv_unit)) { 854 DPRINTK("CHIOSVOLTAG: invalid parameter\n"); 855 return -EBADSLT; 856 } 857 elem = ch->firsts[csv.csv_type] + csv.csv_unit; 858 mutex_lock(&ch->lock); 859 retval = ch_set_voltag(ch, elem, 860 csv.csv_flags & CSV_AVOLTAG, 861 csv.csv_flags & CSV_CLEARTAG, 862 csv.csv_voltag); 863 mutex_unlock(&ch->lock); 864 return retval; 865 } 866 867 default: 868 return scsi_ioctl(ch->device, file->f_mode & FMODE_WRITE, cmd, 869 argp); 870 871 } 872 } 873 874 /* ------------------------------------------------------------------------ */ 875 876 static int ch_probe(struct scsi_device *sd) 877 { 878 struct device *dev = &sd->sdev_gendev; 879 struct device *class_dev; 880 int ret; 881 scsi_changer *ch; 882 883 if (sd->type != TYPE_MEDIUM_CHANGER) 884 return -ENODEV; 885 886 ch = kzalloc_obj(*ch); 887 if (NULL == ch) 888 return -ENOMEM; 889 890 idr_preload(GFP_KERNEL); 891 spin_lock(&ch_index_lock); 892 ret = idr_alloc(&ch_index_idr, ch, 0, CH_MAX_DEVS + 1, GFP_NOWAIT); 893 spin_unlock(&ch_index_lock); 894 idr_preload_end(); 895 896 if (ret < 0) { 897 if (ret == -ENOSPC) 898 ret = -ENODEV; 899 goto free_ch; 900 } 901 902 ch->minor = ret; 903 sprintf(ch->name,"ch%d",ch->minor); 904 ret = scsi_device_get(sd); 905 if (ret) { 906 sdev_printk(KERN_WARNING, sd, "ch%d: failed to get device\n", 907 ch->minor); 908 goto remove_idr; 909 } 910 911 mutex_init(&ch->lock); 912 kref_init(&ch->ref); 913 ch->device = sd; 914 class_dev = device_create(&ch_sysfs_class, dev, 915 MKDEV(SCSI_CHANGER_MAJOR, ch->minor), ch, 916 "s%s", ch->name); 917 if (IS_ERR(class_dev)) { 918 sdev_printk(KERN_WARNING, sd, "ch%d: device_create failed\n", 919 ch->minor); 920 ret = PTR_ERR(class_dev); 921 goto put_device; 922 } 923 924 mutex_lock(&ch->lock); 925 ret = ch_readconfig(ch); 926 if (ret) { 927 mutex_unlock(&ch->lock); 928 goto destroy_dev; 929 } 930 if (init) 931 ch_init_elem(ch); 932 933 mutex_unlock(&ch->lock); 934 dev_set_drvdata(dev, ch); 935 sdev_printk(KERN_INFO, sd, "Attached scsi changer %s\n", ch->name); 936 937 return 0; 938 destroy_dev: 939 device_destroy(&ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR, ch->minor)); 940 put_device: 941 scsi_device_put(sd); 942 remove_idr: 943 idr_remove(&ch_index_idr, ch->minor); 944 free_ch: 945 kfree(ch); 946 return ret; 947 } 948 949 static void ch_remove(struct scsi_device *sd) 950 { 951 struct device *dev = &sd->sdev_gendev; 952 scsi_changer *ch = dev_get_drvdata(dev); 953 954 spin_lock(&ch_index_lock); 955 idr_remove(&ch_index_idr, ch->minor); 956 dev_set_drvdata(dev, NULL); 957 spin_unlock(&ch_index_lock); 958 959 device_destroy(&ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR, ch->minor)); 960 scsi_device_put(ch->device); 961 kref_put(&ch->ref, ch_destroy); 962 } 963 964 static struct scsi_driver ch_template = { 965 .probe = ch_probe, 966 .remove = ch_remove, 967 .gendrv = { 968 .name = "ch", 969 .owner = THIS_MODULE, 970 }, 971 }; 972 973 static const struct file_operations changer_fops = { 974 .owner = THIS_MODULE, 975 .open = ch_open, 976 .release = ch_release, 977 .unlocked_ioctl = ch_ioctl, 978 .compat_ioctl = compat_ptr_ioctl, 979 .llseek = noop_llseek, 980 }; 981 982 static int __init init_ch_module(void) 983 { 984 int rc; 985 986 printk(KERN_INFO "SCSI Media Changer driver v" VERSION " \n"); 987 rc = class_register(&ch_sysfs_class); 988 if (rc) 989 return rc; 990 rc = register_chrdev(SCSI_CHANGER_MAJOR,"ch",&changer_fops); 991 if (rc < 0) { 992 printk("Unable to get major %d for SCSI-Changer\n", 993 SCSI_CHANGER_MAJOR); 994 goto fail1; 995 } 996 rc = scsi_register_driver(&ch_template); 997 if (rc < 0) 998 goto fail2; 999 return 0; 1000 1001 fail2: 1002 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch"); 1003 fail1: 1004 class_unregister(&ch_sysfs_class); 1005 return rc; 1006 } 1007 1008 static void __exit exit_ch_module(void) 1009 { 1010 scsi_unregister_driver(&ch_template); 1011 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch"); 1012 class_unregister(&ch_sysfs_class); 1013 idr_destroy(&ch_index_idr); 1014 } 1015 1016 module_init(init_ch_module); 1017 module_exit(exit_ch_module); 1018