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 = 0; 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 unit_attention; 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 unsigned char sense; 126 unsigned char asc; 127 unsigned char ascq; 128 int errno; 129 } ch_err[] = { 130 /* Just filled in what looks right. Hav'nt checked any standard paper for 131 these errno assignments, so they may be wrong... */ 132 { 133 .sense = ILLEGAL_REQUEST, 134 .asc = 0x21, 135 .ascq = 0x01, 136 .errno = EBADSLT, /* Invalid element address */ 137 },{ 138 .sense = ILLEGAL_REQUEST, 139 .asc = 0x28, 140 .ascq = 0x01, 141 .errno = EBADE, /* Import or export element accessed */ 142 },{ 143 .sense = ILLEGAL_REQUEST, 144 .asc = 0x3B, 145 .ascq = 0x0D, 146 .errno = EXFULL, /* Medium destination element full */ 147 },{ 148 .sense = ILLEGAL_REQUEST, 149 .asc = 0x3B, 150 .ascq = 0x0E, 151 .errno = EBADE, /* Medium source element empty */ 152 },{ 153 .sense = ILLEGAL_REQUEST, 154 .asc = 0x20, 155 .ascq = 0x00, 156 .errno = EBADRQC, /* Invalid command operation code */ 157 },{ 158 /* end of list */ 159 } 160 }; 161 162 /* ------------------------------------------------------------------- */ 163 164 static int ch_find_errno(struct scsi_sense_hdr *sshdr) 165 { 166 int i,errno = 0; 167 168 /* Check to see if additional sense information is available */ 169 if (scsi_sense_valid(sshdr) && 170 sshdr->asc != 0) { 171 for (i = 0; ch_err[i].errno != 0; i++) { 172 if (ch_err[i].sense == sshdr->sense_key && 173 ch_err[i].asc == sshdr->asc && 174 ch_err[i].ascq == sshdr->ascq) { 175 errno = -ch_err[i].errno; 176 break; 177 } 178 } 179 } 180 if (errno == 0) 181 errno = -EIO; 182 return errno; 183 } 184 185 static int 186 ch_do_scsi(scsi_changer *ch, unsigned char *cmd, int cmd_len, 187 void *buffer, unsigned buflength, 188 enum dma_data_direction direction) 189 { 190 int errno, retries = 0, timeout, result; 191 struct scsi_sense_hdr sshdr; 192 193 timeout = (cmd[0] == INITIALIZE_ELEMENT_STATUS) 194 ? timeout_init : timeout_move; 195 196 retry: 197 errno = 0; 198 result = scsi_execute_req(ch->device, cmd, direction, buffer, 199 buflength, &sshdr, timeout * HZ, 200 MAX_RETRIES, NULL); 201 if (result < 0) 202 return result; 203 if (scsi_sense_valid(&sshdr)) { 204 if (debug) 205 scsi_print_sense_hdr(ch->device, ch->name, &sshdr); 206 errno = ch_find_errno(&sshdr); 207 208 switch(sshdr.sense_key) { 209 case UNIT_ATTENTION: 210 ch->unit_attention = 1; 211 if (retries++ < 3) 212 goto retry; 213 break; 214 } 215 } 216 return errno; 217 } 218 219 /* ------------------------------------------------------------------------ */ 220 221 static int 222 ch_elem_to_typecode(scsi_changer *ch, u_int elem) 223 { 224 int i; 225 226 for (i = 0; i < CH_TYPES; i++) { 227 if (elem >= ch->firsts[i] && 228 elem < ch->firsts[i] + 229 ch->counts[i]) 230 return i+1; 231 } 232 return 0; 233 } 234 235 static int 236 ch_read_element_status(scsi_changer *ch, u_int elem, char *data) 237 { 238 u_char cmd[12]; 239 u_char *buffer; 240 int result; 241 242 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); 243 if(!buffer) 244 return -ENOMEM; 245 246 retry: 247 memset(cmd,0,sizeof(cmd)); 248 cmd[0] = READ_ELEMENT_STATUS; 249 cmd[1] = ((ch->device->lun & 0x7) << 5) | 250 (ch->voltags ? 0x10 : 0) | 251 ch_elem_to_typecode(ch,elem); 252 cmd[2] = (elem >> 8) & 0xff; 253 cmd[3] = elem & 0xff; 254 cmd[5] = 1; 255 cmd[9] = 255; 256 if (0 == (result = ch_do_scsi(ch, cmd, 12, 257 buffer, 256, DMA_FROM_DEVICE))) { 258 if (((buffer[16] << 8) | buffer[17]) != elem) { 259 DPRINTK("asked for element 0x%02x, got 0x%02x\n", 260 elem,(buffer[16] << 8) | buffer[17]); 261 kfree(buffer); 262 return -EIO; 263 } 264 memcpy(data,buffer+16,16); 265 } else { 266 if (ch->voltags) { 267 ch->voltags = 0; 268 VPRINTK(KERN_INFO, "device has no volume tag support\n"); 269 goto retry; 270 } 271 DPRINTK("READ ELEMENT STATUS for element 0x%x failed\n",elem); 272 } 273 kfree(buffer); 274 return result; 275 } 276 277 static int 278 ch_init_elem(scsi_changer *ch) 279 { 280 int err; 281 u_char cmd[6]; 282 283 VPRINTK(KERN_INFO, "INITIALIZE ELEMENT STATUS, may take some time ...\n"); 284 memset(cmd,0,sizeof(cmd)); 285 cmd[0] = INITIALIZE_ELEMENT_STATUS; 286 cmd[1] = (ch->device->lun & 0x7) << 5; 287 err = ch_do_scsi(ch, cmd, 6, NULL, 0, DMA_NONE); 288 VPRINTK(KERN_INFO, "... finished\n"); 289 return err; 290 } 291 292 static int 293 ch_readconfig(scsi_changer *ch) 294 { 295 u_char cmd[10], data[16]; 296 u_char *buffer; 297 int result,id,lun,i; 298 u_int elem; 299 300 buffer = kzalloc(512, GFP_KERNEL | GFP_DMA); 301 if (!buffer) 302 return -ENOMEM; 303 304 memset(cmd,0,sizeof(cmd)); 305 cmd[0] = MODE_SENSE; 306 cmd[1] = (ch->device->lun & 0x7) << 5; 307 cmd[2] = 0x1d; 308 cmd[4] = 255; 309 result = ch_do_scsi(ch, cmd, 10, buffer, 255, DMA_FROM_DEVICE); 310 if (0 != result) { 311 cmd[1] |= (1<<3); 312 result = ch_do_scsi(ch, cmd, 10, buffer, 255, DMA_FROM_DEVICE); 313 } 314 if (0 == result) { 315 ch->firsts[CHET_MT] = 316 (buffer[buffer[3]+ 6] << 8) | buffer[buffer[3]+ 7]; 317 ch->counts[CHET_MT] = 318 (buffer[buffer[3]+ 8] << 8) | buffer[buffer[3]+ 9]; 319 ch->firsts[CHET_ST] = 320 (buffer[buffer[3]+10] << 8) | buffer[buffer[3]+11]; 321 ch->counts[CHET_ST] = 322 (buffer[buffer[3]+12] << 8) | buffer[buffer[3]+13]; 323 ch->firsts[CHET_IE] = 324 (buffer[buffer[3]+14] << 8) | buffer[buffer[3]+15]; 325 ch->counts[CHET_IE] = 326 (buffer[buffer[3]+16] << 8) | buffer[buffer[3]+17]; 327 ch->firsts[CHET_DT] = 328 (buffer[buffer[3]+18] << 8) | buffer[buffer[3]+19]; 329 ch->counts[CHET_DT] = 330 (buffer[buffer[3]+20] << 8) | buffer[buffer[3]+21]; 331 VPRINTK(KERN_INFO, "type #1 (mt): 0x%x+%d [medium transport]\n", 332 ch->firsts[CHET_MT], 333 ch->counts[CHET_MT]); 334 VPRINTK(KERN_INFO, "type #2 (st): 0x%x+%d [storage]\n", 335 ch->firsts[CHET_ST], 336 ch->counts[CHET_ST]); 337 VPRINTK(KERN_INFO, "type #3 (ie): 0x%x+%d [import/export]\n", 338 ch->firsts[CHET_IE], 339 ch->counts[CHET_IE]); 340 VPRINTK(KERN_INFO, "type #4 (dt): 0x%x+%d [data transfer]\n", 341 ch->firsts[CHET_DT], 342 ch->counts[CHET_DT]); 343 } else { 344 VPRINTK(KERN_INFO, "reading element address assignment page failed!\n"); 345 } 346 347 /* vendor specific element types */ 348 for (i = 0; i < 4; i++) { 349 if (0 == vendor_counts[i]) 350 continue; 351 if (NULL == vendor_labels[i]) 352 continue; 353 ch->firsts[CHET_V1+i] = vendor_firsts[i]; 354 ch->counts[CHET_V1+i] = vendor_counts[i]; 355 VPRINTK(KERN_INFO, "type #%d (v%d): 0x%x+%d [%s, vendor specific]\n", 356 i+5,i+1,vendor_firsts[i],vendor_counts[i], 357 vendor_labels[i]); 358 } 359 360 /* look up the devices of the data transfer elements */ 361 ch->dt = kcalloc(ch->counts[CHET_DT], sizeof(*ch->dt), 362 GFP_KERNEL); 363 364 if (!ch->dt) { 365 kfree(buffer); 366 return -ENOMEM; 367 } 368 369 for (elem = 0; elem < ch->counts[CHET_DT]; elem++) { 370 id = -1; 371 lun = 0; 372 if (elem < CH_DT_MAX && -1 != dt_id[elem]) { 373 id = dt_id[elem]; 374 lun = dt_lun[elem]; 375 VPRINTK(KERN_INFO, "dt 0x%x: [insmod option] ", 376 elem+ch->firsts[CHET_DT]); 377 } else if (0 != ch_read_element_status 378 (ch,elem+ch->firsts[CHET_DT],data)) { 379 VPRINTK(KERN_INFO, "dt 0x%x: READ ELEMENT STATUS failed\n", 380 elem+ch->firsts[CHET_DT]); 381 } else { 382 VPRINTK(KERN_INFO, "dt 0x%x: ",elem+ch->firsts[CHET_DT]); 383 if (data[6] & 0x80) { 384 VPRINTK(KERN_CONT, "not this SCSI bus\n"); 385 ch->dt[elem] = NULL; 386 } else if (0 == (data[6] & 0x30)) { 387 VPRINTK(KERN_CONT, "ID/LUN unknown\n"); 388 ch->dt[elem] = NULL; 389 } else { 390 id = ch->device->id; 391 lun = 0; 392 if (data[6] & 0x20) id = data[7]; 393 if (data[6] & 0x10) lun = data[6] & 7; 394 } 395 } 396 if (-1 != id) { 397 VPRINTK(KERN_CONT, "ID %i, LUN %i, ",id,lun); 398 ch->dt[elem] = 399 scsi_device_lookup(ch->device->host, 400 ch->device->channel, 401 id,lun); 402 if (!ch->dt[elem]) { 403 /* should not happen */ 404 VPRINTK(KERN_CONT, "Huh? device not found!\n"); 405 } else { 406 VPRINTK(KERN_CONT, "name: %8.8s %16.16s %4.4s\n", 407 ch->dt[elem]->vendor, 408 ch->dt[elem]->model, 409 ch->dt[elem]->rev); 410 } 411 } 412 } 413 ch->voltags = 1; 414 kfree(buffer); 415 416 return 0; 417 } 418 419 /* ------------------------------------------------------------------------ */ 420 421 static int 422 ch_position(scsi_changer *ch, u_int trans, u_int elem, int rotate) 423 { 424 u_char cmd[10]; 425 426 DPRINTK("position: 0x%x\n",elem); 427 if (0 == trans) 428 trans = ch->firsts[CHET_MT]; 429 memset(cmd,0,sizeof(cmd)); 430 cmd[0] = POSITION_TO_ELEMENT; 431 cmd[1] = (ch->device->lun & 0x7) << 5; 432 cmd[2] = (trans >> 8) & 0xff; 433 cmd[3] = trans & 0xff; 434 cmd[4] = (elem >> 8) & 0xff; 435 cmd[5] = elem & 0xff; 436 cmd[8] = rotate ? 1 : 0; 437 return ch_do_scsi(ch, cmd, 10, NULL, 0, DMA_NONE); 438 } 439 440 static int 441 ch_move(scsi_changer *ch, u_int trans, u_int src, u_int dest, int rotate) 442 { 443 u_char cmd[12]; 444 445 DPRINTK("move: 0x%x => 0x%x\n",src,dest); 446 if (0 == trans) 447 trans = ch->firsts[CHET_MT]; 448 memset(cmd,0,sizeof(cmd)); 449 cmd[0] = MOVE_MEDIUM; 450 cmd[1] = (ch->device->lun & 0x7) << 5; 451 cmd[2] = (trans >> 8) & 0xff; 452 cmd[3] = trans & 0xff; 453 cmd[4] = (src >> 8) & 0xff; 454 cmd[5] = src & 0xff; 455 cmd[6] = (dest >> 8) & 0xff; 456 cmd[7] = dest & 0xff; 457 cmd[10] = rotate ? 1 : 0; 458 return ch_do_scsi(ch, cmd, 12, NULL,0, DMA_NONE); 459 } 460 461 static int 462 ch_exchange(scsi_changer *ch, u_int trans, u_int src, 463 u_int dest1, u_int dest2, int rotate1, int rotate2) 464 { 465 u_char cmd[12]; 466 467 DPRINTK("exchange: 0x%x => 0x%x => 0x%x\n", 468 src,dest1,dest2); 469 if (0 == trans) 470 trans = ch->firsts[CHET_MT]; 471 memset(cmd,0,sizeof(cmd)); 472 cmd[0] = EXCHANGE_MEDIUM; 473 cmd[1] = (ch->device->lun & 0x7) << 5; 474 cmd[2] = (trans >> 8) & 0xff; 475 cmd[3] = trans & 0xff; 476 cmd[4] = (src >> 8) & 0xff; 477 cmd[5] = src & 0xff; 478 cmd[6] = (dest1 >> 8) & 0xff; 479 cmd[7] = dest1 & 0xff; 480 cmd[8] = (dest2 >> 8) & 0xff; 481 cmd[9] = dest2 & 0xff; 482 cmd[10] = (rotate1 ? 1 : 0) | (rotate2 ? 2 : 0); 483 484 return ch_do_scsi(ch, cmd, 12, NULL, 0, DMA_NONE); 485 } 486 487 static void 488 ch_check_voltag(char *tag) 489 { 490 int i; 491 492 for (i = 0; i < 32; i++) { 493 /* restrict to ascii */ 494 if (tag[i] >= 0x7f || tag[i] < 0x20) 495 tag[i] = ' '; 496 /* don't allow search wildcards */ 497 if (tag[i] == '?' || 498 tag[i] == '*') 499 tag[i] = ' '; 500 } 501 } 502 503 static int 504 ch_set_voltag(scsi_changer *ch, u_int elem, 505 int alternate, int clear, u_char *tag) 506 { 507 u_char cmd[12]; 508 u_char *buffer; 509 int result; 510 511 buffer = kzalloc(512, GFP_KERNEL); 512 if (!buffer) 513 return -ENOMEM; 514 515 DPRINTK("%s %s voltag: 0x%x => \"%s\"\n", 516 clear ? "clear" : "set", 517 alternate ? "alternate" : "primary", 518 elem, tag); 519 memset(cmd,0,sizeof(cmd)); 520 cmd[0] = SEND_VOLUME_TAG; 521 cmd[1] = ((ch->device->lun & 0x7) << 5) | 522 ch_elem_to_typecode(ch,elem); 523 cmd[2] = (elem >> 8) & 0xff; 524 cmd[3] = elem & 0xff; 525 cmd[5] = clear 526 ? (alternate ? 0x0d : 0x0c) 527 : (alternate ? 0x0b : 0x0a); 528 529 cmd[9] = 255; 530 531 memcpy(buffer,tag,32); 532 ch_check_voltag(buffer); 533 534 result = ch_do_scsi(ch, cmd, 12, buffer, 256, DMA_TO_DEVICE); 535 kfree(buffer); 536 return result; 537 } 538 539 static int ch_gstatus(scsi_changer *ch, int type, unsigned char __user *dest) 540 { 541 int retval = 0; 542 u_char data[16]; 543 unsigned int i; 544 545 mutex_lock(&ch->lock); 546 for (i = 0; i < ch->counts[type]; i++) { 547 if (0 != ch_read_element_status 548 (ch, ch->firsts[type]+i,data)) { 549 retval = -EIO; 550 break; 551 } 552 put_user(data[2], dest+i); 553 if (data[2] & CESTATUS_EXCEPT) 554 VPRINTK(KERN_INFO, "element 0x%x: asc=0x%x, ascq=0x%x\n", 555 ch->firsts[type]+i, 556 (int)data[4],(int)data[5]); 557 retval = ch_read_element_status 558 (ch, ch->firsts[type]+i,data); 559 if (0 != retval) 560 break; 561 } 562 mutex_unlock(&ch->lock); 563 return retval; 564 } 565 566 /* ------------------------------------------------------------------------ */ 567 568 static void ch_destroy(struct kref *ref) 569 { 570 scsi_changer *ch = container_of(ref, scsi_changer, ref); 571 572 ch->device = NULL; 573 kfree(ch->dt); 574 kfree(ch); 575 } 576 577 static int 578 ch_release(struct inode *inode, struct file *file) 579 { 580 scsi_changer *ch = file->private_data; 581 582 scsi_device_put(ch->device); 583 file->private_data = NULL; 584 kref_put(&ch->ref, ch_destroy); 585 return 0; 586 } 587 588 static int 589 ch_open(struct inode *inode, struct file *file) 590 { 591 scsi_changer *ch; 592 int minor = iminor(inode); 593 594 spin_lock(&ch_index_lock); 595 ch = idr_find(&ch_index_idr, minor); 596 597 if (ch == NULL || !kref_get_unless_zero(&ch->ref)) { 598 spin_unlock(&ch_index_lock); 599 return -ENXIO; 600 } 601 spin_unlock(&ch_index_lock); 602 if (scsi_device_get(ch->device)) { 603 kref_put(&ch->ref, ch_destroy); 604 return -ENXIO; 605 } 606 /* Synchronize with ch_probe() */ 607 mutex_lock(&ch->lock); 608 file->private_data = ch; 609 mutex_unlock(&ch->lock); 610 return 0; 611 } 612 613 static int 614 ch_checkrange(scsi_changer *ch, unsigned int type, unsigned int unit) 615 { 616 if (type >= CH_TYPES || unit >= ch->counts[type]) 617 return -1; 618 return 0; 619 } 620 621 static long ch_ioctl(struct file *file, 622 unsigned int cmd, unsigned long arg) 623 { 624 scsi_changer *ch = file->private_data; 625 int retval; 626 void __user *argp = (void __user *)arg; 627 628 retval = scsi_ioctl_block_when_processing_errors(ch->device, cmd, 629 file->f_flags & O_NDELAY); 630 if (retval) 631 return retval; 632 633 switch (cmd) { 634 case CHIOGPARAMS: 635 { 636 struct changer_params params; 637 638 params.cp_curpicker = 0; 639 params.cp_npickers = ch->counts[CHET_MT]; 640 params.cp_nslots = ch->counts[CHET_ST]; 641 params.cp_nportals = ch->counts[CHET_IE]; 642 params.cp_ndrives = ch->counts[CHET_DT]; 643 644 if (copy_to_user(argp, ¶ms, sizeof(params))) 645 return -EFAULT; 646 return 0; 647 } 648 case CHIOGVPARAMS: 649 { 650 struct changer_vendor_params vparams; 651 652 memset(&vparams,0,sizeof(vparams)); 653 if (ch->counts[CHET_V1]) { 654 vparams.cvp_n1 = ch->counts[CHET_V1]; 655 strncpy(vparams.cvp_label1,vendor_labels[0],16); 656 } 657 if (ch->counts[CHET_V2]) { 658 vparams.cvp_n2 = ch->counts[CHET_V2]; 659 strncpy(vparams.cvp_label2,vendor_labels[1],16); 660 } 661 if (ch->counts[CHET_V3]) { 662 vparams.cvp_n3 = ch->counts[CHET_V3]; 663 strncpy(vparams.cvp_label3,vendor_labels[2],16); 664 } 665 if (ch->counts[CHET_V4]) { 666 vparams.cvp_n4 = ch->counts[CHET_V4]; 667 strncpy(vparams.cvp_label4,vendor_labels[3],16); 668 } 669 if (copy_to_user(argp, &vparams, sizeof(vparams))) 670 return -EFAULT; 671 return 0; 672 } 673 674 case CHIOPOSITION: 675 { 676 struct changer_position pos; 677 678 if (copy_from_user(&pos, argp, sizeof (pos))) 679 return -EFAULT; 680 681 if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) { 682 DPRINTK("CHIOPOSITION: invalid parameter\n"); 683 return -EBADSLT; 684 } 685 mutex_lock(&ch->lock); 686 retval = ch_position(ch,0, 687 ch->firsts[pos.cp_type] + pos.cp_unit, 688 pos.cp_flags & CP_INVERT); 689 mutex_unlock(&ch->lock); 690 return retval; 691 } 692 693 case CHIOMOVE: 694 { 695 struct changer_move mv; 696 697 if (copy_from_user(&mv, argp, sizeof (mv))) 698 return -EFAULT; 699 700 if (0 != ch_checkrange(ch, mv.cm_fromtype, mv.cm_fromunit) || 701 0 != ch_checkrange(ch, mv.cm_totype, mv.cm_tounit )) { 702 DPRINTK("CHIOMOVE: invalid parameter\n"); 703 return -EBADSLT; 704 } 705 706 mutex_lock(&ch->lock); 707 retval = ch_move(ch,0, 708 ch->firsts[mv.cm_fromtype] + mv.cm_fromunit, 709 ch->firsts[mv.cm_totype] + mv.cm_tounit, 710 mv.cm_flags & CM_INVERT); 711 mutex_unlock(&ch->lock); 712 return retval; 713 } 714 715 case CHIOEXCHANGE: 716 { 717 struct changer_exchange mv; 718 719 if (copy_from_user(&mv, argp, sizeof (mv))) 720 return -EFAULT; 721 722 if (0 != ch_checkrange(ch, mv.ce_srctype, mv.ce_srcunit ) || 723 0 != ch_checkrange(ch, mv.ce_fdsttype, mv.ce_fdstunit) || 724 0 != ch_checkrange(ch, mv.ce_sdsttype, mv.ce_sdstunit)) { 725 DPRINTK("CHIOEXCHANGE: invalid parameter\n"); 726 return -EBADSLT; 727 } 728 729 mutex_lock(&ch->lock); 730 retval = ch_exchange 731 (ch,0, 732 ch->firsts[mv.ce_srctype] + mv.ce_srcunit, 733 ch->firsts[mv.ce_fdsttype] + mv.ce_fdstunit, 734 ch->firsts[mv.ce_sdsttype] + mv.ce_sdstunit, 735 mv.ce_flags & CE_INVERT1, mv.ce_flags & CE_INVERT2); 736 mutex_unlock(&ch->lock); 737 return retval; 738 } 739 740 case CHIOGSTATUS: 741 { 742 struct changer_element_status ces; 743 744 if (copy_from_user(&ces, argp, sizeof (ces))) 745 return -EFAULT; 746 if (ces.ces_type < 0 || ces.ces_type >= CH_TYPES) 747 return -EINVAL; 748 749 return ch_gstatus(ch, ces.ces_type, ces.ces_data); 750 } 751 752 case CHIOGELEM: 753 { 754 struct changer_get_element cge; 755 u_char ch_cmd[12]; 756 u_char *buffer; 757 unsigned int elem; 758 int result,i; 759 760 if (copy_from_user(&cge, argp, sizeof (cge))) 761 return -EFAULT; 762 763 if (0 != ch_checkrange(ch, cge.cge_type, cge.cge_unit)) 764 return -EINVAL; 765 elem = ch->firsts[cge.cge_type] + cge.cge_unit; 766 767 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); 768 if (!buffer) 769 return -ENOMEM; 770 mutex_lock(&ch->lock); 771 772 voltag_retry: 773 memset(ch_cmd, 0, sizeof(ch_cmd)); 774 ch_cmd[0] = READ_ELEMENT_STATUS; 775 ch_cmd[1] = ((ch->device->lun & 0x7) << 5) | 776 (ch->voltags ? 0x10 : 0) | 777 ch_elem_to_typecode(ch,elem); 778 ch_cmd[2] = (elem >> 8) & 0xff; 779 ch_cmd[3] = elem & 0xff; 780 ch_cmd[5] = 1; 781 ch_cmd[9] = 255; 782 783 result = ch_do_scsi(ch, ch_cmd, 12, 784 buffer, 256, DMA_FROM_DEVICE); 785 if (!result) { 786 cge.cge_status = buffer[18]; 787 cge.cge_flags = 0; 788 if (buffer[18] & CESTATUS_EXCEPT) { 789 cge.cge_errno = EIO; 790 } 791 if (buffer[25] & 0x80) { 792 cge.cge_flags |= CGE_SRC; 793 if (buffer[25] & 0x40) 794 cge.cge_flags |= CGE_INVERT; 795 elem = (buffer[26]<<8) | buffer[27]; 796 for (i = 0; i < 4; i++) { 797 if (elem >= ch->firsts[i] && 798 elem < ch->firsts[i] + ch->counts[i]) { 799 cge.cge_srctype = i; 800 cge.cge_srcunit = elem-ch->firsts[i]; 801 } 802 } 803 } 804 if ((buffer[22] & 0x30) == 0x30) { 805 cge.cge_flags |= CGE_IDLUN; 806 cge.cge_id = buffer[23]; 807 cge.cge_lun = buffer[22] & 7; 808 } 809 if (buffer[9] & 0x80) { 810 cge.cge_flags |= CGE_PVOLTAG; 811 memcpy(cge.cge_pvoltag,buffer+28,36); 812 } 813 if (buffer[9] & 0x40) { 814 cge.cge_flags |= CGE_AVOLTAG; 815 memcpy(cge.cge_avoltag,buffer+64,36); 816 } 817 } else if (ch->voltags) { 818 ch->voltags = 0; 819 VPRINTK(KERN_INFO, "device has no volume tag support\n"); 820 goto voltag_retry; 821 } 822 kfree(buffer); 823 mutex_unlock(&ch->lock); 824 825 if (copy_to_user(argp, &cge, sizeof (cge))) 826 return -EFAULT; 827 return result; 828 } 829 830 case CHIOINITELEM: 831 { 832 mutex_lock(&ch->lock); 833 retval = ch_init_elem(ch); 834 mutex_unlock(&ch->lock); 835 return retval; 836 } 837 838 case CHIOSVOLTAG: 839 { 840 struct changer_set_voltag csv; 841 int elem; 842 843 if (copy_from_user(&csv, argp, sizeof(csv))) 844 return -EFAULT; 845 846 if (0 != ch_checkrange(ch, csv.csv_type, csv.csv_unit)) { 847 DPRINTK("CHIOSVOLTAG: invalid parameter\n"); 848 return -EBADSLT; 849 } 850 elem = ch->firsts[csv.csv_type] + csv.csv_unit; 851 mutex_lock(&ch->lock); 852 retval = ch_set_voltag(ch, elem, 853 csv.csv_flags & CSV_AVOLTAG, 854 csv.csv_flags & CSV_CLEARTAG, 855 csv.csv_voltag); 856 mutex_unlock(&ch->lock); 857 return retval; 858 } 859 860 default: 861 return scsi_ioctl(ch->device, cmd, argp); 862 863 } 864 } 865 866 #ifdef CONFIG_COMPAT 867 868 struct changer_element_status32 { 869 int ces_type; 870 compat_uptr_t ces_data; 871 }; 872 #define CHIOGSTATUS32 _IOW('c', 8,struct changer_element_status32) 873 874 static long ch_ioctl_compat(struct file * file, 875 unsigned int cmd, unsigned long arg) 876 { 877 scsi_changer *ch = file->private_data; 878 int retval = scsi_ioctl_block_when_processing_errors(ch->device, cmd, 879 file->f_flags & O_NDELAY); 880 if (retval) 881 return retval; 882 883 switch (cmd) { 884 case CHIOGPARAMS: 885 case CHIOGVPARAMS: 886 case CHIOPOSITION: 887 case CHIOMOVE: 888 case CHIOEXCHANGE: 889 case CHIOGELEM: 890 case CHIOINITELEM: 891 case CHIOSVOLTAG: 892 /* compatible */ 893 return ch_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); 894 case CHIOGSTATUS32: 895 { 896 struct changer_element_status32 ces32; 897 unsigned char __user *data; 898 899 if (copy_from_user(&ces32, (void __user *)arg, sizeof (ces32))) 900 return -EFAULT; 901 if (ces32.ces_type < 0 || ces32.ces_type >= CH_TYPES) 902 return -EINVAL; 903 904 data = compat_ptr(ces32.ces_data); 905 return ch_gstatus(ch, ces32.ces_type, data); 906 } 907 default: 908 return scsi_compat_ioctl(ch->device, cmd, compat_ptr(arg)); 909 910 } 911 } 912 #endif 913 914 /* ------------------------------------------------------------------------ */ 915 916 static int ch_probe(struct device *dev) 917 { 918 struct scsi_device *sd = to_scsi_device(dev); 919 struct device *class_dev; 920 int ret; 921 scsi_changer *ch; 922 923 if (sd->type != TYPE_MEDIUM_CHANGER) 924 return -ENODEV; 925 926 ch = kzalloc(sizeof(*ch), GFP_KERNEL); 927 if (NULL == ch) 928 return -ENOMEM; 929 930 idr_preload(GFP_KERNEL); 931 spin_lock(&ch_index_lock); 932 ret = idr_alloc(&ch_index_idr, ch, 0, CH_MAX_DEVS + 1, GFP_NOWAIT); 933 spin_unlock(&ch_index_lock); 934 idr_preload_end(); 935 936 if (ret < 0) { 937 if (ret == -ENOSPC) 938 ret = -ENODEV; 939 goto free_ch; 940 } 941 942 ch->minor = ret; 943 sprintf(ch->name,"ch%d",ch->minor); 944 ret = scsi_device_get(sd); 945 if (ret) { 946 sdev_printk(KERN_WARNING, sd, "ch%d: failed to get device\n", 947 ch->minor); 948 goto remove_idr; 949 } 950 951 mutex_init(&ch->lock); 952 kref_init(&ch->ref); 953 ch->device = sd; 954 class_dev = device_create(ch_sysfs_class, dev, 955 MKDEV(SCSI_CHANGER_MAJOR, ch->minor), ch, 956 "s%s", ch->name); 957 if (IS_ERR(class_dev)) { 958 sdev_printk(KERN_WARNING, sd, "ch%d: device_create failed\n", 959 ch->minor); 960 ret = PTR_ERR(class_dev); 961 goto put_device; 962 } 963 964 mutex_lock(&ch->lock); 965 ret = ch_readconfig(ch); 966 if (ret) { 967 mutex_unlock(&ch->lock); 968 goto destroy_dev; 969 } 970 if (init) 971 ch_init_elem(ch); 972 973 mutex_unlock(&ch->lock); 974 dev_set_drvdata(dev, ch); 975 sdev_printk(KERN_INFO, sd, "Attached scsi changer %s\n", ch->name); 976 977 return 0; 978 destroy_dev: 979 device_destroy(ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR, ch->minor)); 980 put_device: 981 scsi_device_put(sd); 982 remove_idr: 983 idr_remove(&ch_index_idr, ch->minor); 984 free_ch: 985 kfree(ch); 986 return ret; 987 } 988 989 static int ch_remove(struct device *dev) 990 { 991 scsi_changer *ch = dev_get_drvdata(dev); 992 993 spin_lock(&ch_index_lock); 994 idr_remove(&ch_index_idr, ch->minor); 995 dev_set_drvdata(dev, NULL); 996 spin_unlock(&ch_index_lock); 997 998 device_destroy(ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR,ch->minor)); 999 scsi_device_put(ch->device); 1000 kref_put(&ch->ref, ch_destroy); 1001 return 0; 1002 } 1003 1004 static struct scsi_driver ch_template = { 1005 .gendrv = { 1006 .name = "ch", 1007 .owner = THIS_MODULE, 1008 .probe = ch_probe, 1009 .remove = ch_remove, 1010 }, 1011 }; 1012 1013 static const struct file_operations changer_fops = { 1014 .owner = THIS_MODULE, 1015 .open = ch_open, 1016 .release = ch_release, 1017 .unlocked_ioctl = ch_ioctl, 1018 #ifdef CONFIG_COMPAT 1019 .compat_ioctl = ch_ioctl_compat, 1020 #endif 1021 .llseek = noop_llseek, 1022 }; 1023 1024 static int __init init_ch_module(void) 1025 { 1026 int rc; 1027 1028 printk(KERN_INFO "SCSI Media Changer driver v" VERSION " \n"); 1029 ch_sysfs_class = class_create(THIS_MODULE, "scsi_changer"); 1030 if (IS_ERR(ch_sysfs_class)) { 1031 rc = PTR_ERR(ch_sysfs_class); 1032 return rc; 1033 } 1034 rc = register_chrdev(SCSI_CHANGER_MAJOR,"ch",&changer_fops); 1035 if (rc < 0) { 1036 printk("Unable to get major %d for SCSI-Changer\n", 1037 SCSI_CHANGER_MAJOR); 1038 goto fail1; 1039 } 1040 rc = scsi_register_driver(&ch_template.gendrv); 1041 if (rc < 0) 1042 goto fail2; 1043 return 0; 1044 1045 fail2: 1046 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch"); 1047 fail1: 1048 class_destroy(ch_sysfs_class); 1049 return rc; 1050 } 1051 1052 static void __exit exit_ch_module(void) 1053 { 1054 scsi_unregister_driver(&ch_template.gendrv); 1055 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch"); 1056 class_destroy(ch_sysfs_class); 1057 idr_destroy(&ch_index_idr); 1058 } 1059 1060 module_init(init_ch_module); 1061 module_exit(exit_ch_module); 1062