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); 201 202 if (driver_byte(result) == DRIVER_SENSE) { 203 if (debug) 204 scsi_print_sense_hdr(ch->device, ch->name, &sshdr); 205 errno = ch_find_errno(&sshdr); 206 207 switch(sshdr.sense_key) { 208 case UNIT_ATTENTION: 209 ch->unit_attention = 1; 210 if (retries++ < 3) 211 goto retry; 212 break; 213 } 214 } 215 return errno; 216 } 217 218 /* ------------------------------------------------------------------------ */ 219 220 static int 221 ch_elem_to_typecode(scsi_changer *ch, u_int elem) 222 { 223 int i; 224 225 for (i = 0; i < CH_TYPES; i++) { 226 if (elem >= ch->firsts[i] && 227 elem < ch->firsts[i] + 228 ch->counts[i]) 229 return i+1; 230 } 231 return 0; 232 } 233 234 static int 235 ch_read_element_status(scsi_changer *ch, u_int elem, char *data) 236 { 237 u_char cmd[12]; 238 u_char *buffer; 239 int result; 240 241 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); 242 if(!buffer) 243 return -ENOMEM; 244 245 retry: 246 memset(cmd,0,sizeof(cmd)); 247 cmd[0] = READ_ELEMENT_STATUS; 248 cmd[1] = ((ch->device->lun & 0x7) << 5) | 249 (ch->voltags ? 0x10 : 0) | 250 ch_elem_to_typecode(ch,elem); 251 cmd[2] = (elem >> 8) & 0xff; 252 cmd[3] = elem & 0xff; 253 cmd[5] = 1; 254 cmd[9] = 255; 255 if (0 == (result = ch_do_scsi(ch, cmd, 12, 256 buffer, 256, DMA_FROM_DEVICE))) { 257 if (((buffer[16] << 8) | buffer[17]) != elem) { 258 DPRINTK("asked for element 0x%02x, got 0x%02x\n", 259 elem,(buffer[16] << 8) | buffer[17]); 260 kfree(buffer); 261 return -EIO; 262 } 263 memcpy(data,buffer+16,16); 264 } else { 265 if (ch->voltags) { 266 ch->voltags = 0; 267 VPRINTK(KERN_INFO, "device has no volume tag support\n"); 268 goto retry; 269 } 270 DPRINTK("READ ELEMENT STATUS for element 0x%x failed\n",elem); 271 } 272 kfree(buffer); 273 return result; 274 } 275 276 static int 277 ch_init_elem(scsi_changer *ch) 278 { 279 int err; 280 u_char cmd[6]; 281 282 VPRINTK(KERN_INFO, "INITIALIZE ELEMENT STATUS, may take some time ...\n"); 283 memset(cmd,0,sizeof(cmd)); 284 cmd[0] = INITIALIZE_ELEMENT_STATUS; 285 cmd[1] = (ch->device->lun & 0x7) << 5; 286 err = ch_do_scsi(ch, cmd, 6, NULL, 0, DMA_NONE); 287 VPRINTK(KERN_INFO, "... finished\n"); 288 return err; 289 } 290 291 static int 292 ch_readconfig(scsi_changer *ch) 293 { 294 u_char cmd[10], data[16]; 295 u_char *buffer; 296 int result,id,lun,i; 297 u_int elem; 298 299 buffer = kzalloc(512, GFP_KERNEL | GFP_DMA); 300 if (!buffer) 301 return -ENOMEM; 302 303 memset(cmd,0,sizeof(cmd)); 304 cmd[0] = MODE_SENSE; 305 cmd[1] = (ch->device->lun & 0x7) << 5; 306 cmd[2] = 0x1d; 307 cmd[4] = 255; 308 result = ch_do_scsi(ch, cmd, 10, buffer, 255, DMA_FROM_DEVICE); 309 if (0 != result) { 310 cmd[1] |= (1<<3); 311 result = ch_do_scsi(ch, cmd, 10, buffer, 255, DMA_FROM_DEVICE); 312 } 313 if (0 == result) { 314 ch->firsts[CHET_MT] = 315 (buffer[buffer[3]+ 6] << 8) | buffer[buffer[3]+ 7]; 316 ch->counts[CHET_MT] = 317 (buffer[buffer[3]+ 8] << 8) | buffer[buffer[3]+ 9]; 318 ch->firsts[CHET_ST] = 319 (buffer[buffer[3]+10] << 8) | buffer[buffer[3]+11]; 320 ch->counts[CHET_ST] = 321 (buffer[buffer[3]+12] << 8) | buffer[buffer[3]+13]; 322 ch->firsts[CHET_IE] = 323 (buffer[buffer[3]+14] << 8) | buffer[buffer[3]+15]; 324 ch->counts[CHET_IE] = 325 (buffer[buffer[3]+16] << 8) | buffer[buffer[3]+17]; 326 ch->firsts[CHET_DT] = 327 (buffer[buffer[3]+18] << 8) | buffer[buffer[3]+19]; 328 ch->counts[CHET_DT] = 329 (buffer[buffer[3]+20] << 8) | buffer[buffer[3]+21]; 330 VPRINTK(KERN_INFO, "type #1 (mt): 0x%x+%d [medium transport]\n", 331 ch->firsts[CHET_MT], 332 ch->counts[CHET_MT]); 333 VPRINTK(KERN_INFO, "type #2 (st): 0x%x+%d [storage]\n", 334 ch->firsts[CHET_ST], 335 ch->counts[CHET_ST]); 336 VPRINTK(KERN_INFO, "type #3 (ie): 0x%x+%d [import/export]\n", 337 ch->firsts[CHET_IE], 338 ch->counts[CHET_IE]); 339 VPRINTK(KERN_INFO, "type #4 (dt): 0x%x+%d [data transfer]\n", 340 ch->firsts[CHET_DT], 341 ch->counts[CHET_DT]); 342 } else { 343 VPRINTK(KERN_INFO, "reading element address assignment page failed!\n"); 344 } 345 346 /* vendor specific element types */ 347 for (i = 0; i < 4; i++) { 348 if (0 == vendor_counts[i]) 349 continue; 350 if (NULL == vendor_labels[i]) 351 continue; 352 ch->firsts[CHET_V1+i] = vendor_firsts[i]; 353 ch->counts[CHET_V1+i] = vendor_counts[i]; 354 VPRINTK(KERN_INFO, "type #%d (v%d): 0x%x+%d [%s, vendor specific]\n", 355 i+5,i+1,vendor_firsts[i],vendor_counts[i], 356 vendor_labels[i]); 357 } 358 359 /* look up the devices of the data transfer elements */ 360 ch->dt = kcalloc(ch->counts[CHET_DT], sizeof(*ch->dt), 361 GFP_KERNEL); 362 363 if (!ch->dt) { 364 kfree(buffer); 365 return -ENOMEM; 366 } 367 368 for (elem = 0; elem < ch->counts[CHET_DT]; elem++) { 369 id = -1; 370 lun = 0; 371 if (elem < CH_DT_MAX && -1 != dt_id[elem]) { 372 id = dt_id[elem]; 373 lun = dt_lun[elem]; 374 VPRINTK(KERN_INFO, "dt 0x%x: [insmod option] ", 375 elem+ch->firsts[CHET_DT]); 376 } else if (0 != ch_read_element_status 377 (ch,elem+ch->firsts[CHET_DT],data)) { 378 VPRINTK(KERN_INFO, "dt 0x%x: READ ELEMENT STATUS failed\n", 379 elem+ch->firsts[CHET_DT]); 380 } else { 381 VPRINTK(KERN_INFO, "dt 0x%x: ",elem+ch->firsts[CHET_DT]); 382 if (data[6] & 0x80) { 383 VPRINTK(KERN_CONT, "not this SCSI bus\n"); 384 ch->dt[elem] = NULL; 385 } else if (0 == (data[6] & 0x30)) { 386 VPRINTK(KERN_CONT, "ID/LUN unknown\n"); 387 ch->dt[elem] = NULL; 388 } else { 389 id = ch->device->id; 390 lun = 0; 391 if (data[6] & 0x20) id = data[7]; 392 if (data[6] & 0x10) lun = data[6] & 7; 393 } 394 } 395 if (-1 != id) { 396 VPRINTK(KERN_CONT, "ID %i, LUN %i, ",id,lun); 397 ch->dt[elem] = 398 scsi_device_lookup(ch->device->host, 399 ch->device->channel, 400 id,lun); 401 if (!ch->dt[elem]) { 402 /* should not happen */ 403 VPRINTK(KERN_CONT, "Huh? device not found!\n"); 404 } else { 405 VPRINTK(KERN_CONT, "name: %8.8s %16.16s %4.4s\n", 406 ch->dt[elem]->vendor, 407 ch->dt[elem]->model, 408 ch->dt[elem]->rev); 409 } 410 } 411 } 412 ch->voltags = 1; 413 kfree(buffer); 414 415 return 0; 416 } 417 418 /* ------------------------------------------------------------------------ */ 419 420 static int 421 ch_position(scsi_changer *ch, u_int trans, u_int elem, int rotate) 422 { 423 u_char cmd[10]; 424 425 DPRINTK("position: 0x%x\n",elem); 426 if (0 == trans) 427 trans = ch->firsts[CHET_MT]; 428 memset(cmd,0,sizeof(cmd)); 429 cmd[0] = POSITION_TO_ELEMENT; 430 cmd[1] = (ch->device->lun & 0x7) << 5; 431 cmd[2] = (trans >> 8) & 0xff; 432 cmd[3] = trans & 0xff; 433 cmd[4] = (elem >> 8) & 0xff; 434 cmd[5] = elem & 0xff; 435 cmd[8] = rotate ? 1 : 0; 436 return ch_do_scsi(ch, cmd, 10, NULL, 0, DMA_NONE); 437 } 438 439 static int 440 ch_move(scsi_changer *ch, u_int trans, u_int src, u_int dest, int rotate) 441 { 442 u_char cmd[12]; 443 444 DPRINTK("move: 0x%x => 0x%x\n",src,dest); 445 if (0 == trans) 446 trans = ch->firsts[CHET_MT]; 447 memset(cmd,0,sizeof(cmd)); 448 cmd[0] = MOVE_MEDIUM; 449 cmd[1] = (ch->device->lun & 0x7) << 5; 450 cmd[2] = (trans >> 8) & 0xff; 451 cmd[3] = trans & 0xff; 452 cmd[4] = (src >> 8) & 0xff; 453 cmd[5] = src & 0xff; 454 cmd[6] = (dest >> 8) & 0xff; 455 cmd[7] = dest & 0xff; 456 cmd[10] = rotate ? 1 : 0; 457 return ch_do_scsi(ch, cmd, 12, NULL,0, DMA_NONE); 458 } 459 460 static int 461 ch_exchange(scsi_changer *ch, u_int trans, u_int src, 462 u_int dest1, u_int dest2, int rotate1, int rotate2) 463 { 464 u_char cmd[12]; 465 466 DPRINTK("exchange: 0x%x => 0x%x => 0x%x\n", 467 src,dest1,dest2); 468 if (0 == trans) 469 trans = ch->firsts[CHET_MT]; 470 memset(cmd,0,sizeof(cmd)); 471 cmd[0] = EXCHANGE_MEDIUM; 472 cmd[1] = (ch->device->lun & 0x7) << 5; 473 cmd[2] = (trans >> 8) & 0xff; 474 cmd[3] = trans & 0xff; 475 cmd[4] = (src >> 8) & 0xff; 476 cmd[5] = src & 0xff; 477 cmd[6] = (dest1 >> 8) & 0xff; 478 cmd[7] = dest1 & 0xff; 479 cmd[8] = (dest2 >> 8) & 0xff; 480 cmd[9] = dest2 & 0xff; 481 cmd[10] = (rotate1 ? 1 : 0) | (rotate2 ? 2 : 0); 482 483 return ch_do_scsi(ch, cmd, 12, NULL, 0, DMA_NONE); 484 } 485 486 static void 487 ch_check_voltag(char *tag) 488 { 489 int i; 490 491 for (i = 0; i < 32; i++) { 492 /* restrict to ascii */ 493 if (tag[i] >= 0x7f || tag[i] < 0x20) 494 tag[i] = ' '; 495 /* don't allow search wildcards */ 496 if (tag[i] == '?' || 497 tag[i] == '*') 498 tag[i] = ' '; 499 } 500 } 501 502 static int 503 ch_set_voltag(scsi_changer *ch, u_int elem, 504 int alternate, int clear, u_char *tag) 505 { 506 u_char cmd[12]; 507 u_char *buffer; 508 int result; 509 510 buffer = kzalloc(512, GFP_KERNEL); 511 if (!buffer) 512 return -ENOMEM; 513 514 DPRINTK("%s %s voltag: 0x%x => \"%s\"\n", 515 clear ? "clear" : "set", 516 alternate ? "alternate" : "primary", 517 elem, tag); 518 memset(cmd,0,sizeof(cmd)); 519 cmd[0] = SEND_VOLUME_TAG; 520 cmd[1] = ((ch->device->lun & 0x7) << 5) | 521 ch_elem_to_typecode(ch,elem); 522 cmd[2] = (elem >> 8) & 0xff; 523 cmd[3] = elem & 0xff; 524 cmd[5] = clear 525 ? (alternate ? 0x0d : 0x0c) 526 : (alternate ? 0x0b : 0x0a); 527 528 cmd[9] = 255; 529 530 memcpy(buffer,tag,32); 531 ch_check_voltag(buffer); 532 533 result = ch_do_scsi(ch, cmd, 12, buffer, 256, DMA_TO_DEVICE); 534 kfree(buffer); 535 return result; 536 } 537 538 static int ch_gstatus(scsi_changer *ch, int type, unsigned char __user *dest) 539 { 540 int retval = 0; 541 u_char data[16]; 542 unsigned int i; 543 544 mutex_lock(&ch->lock); 545 for (i = 0; i < ch->counts[type]; i++) { 546 if (0 != ch_read_element_status 547 (ch, ch->firsts[type]+i,data)) { 548 retval = -EIO; 549 break; 550 } 551 put_user(data[2], dest+i); 552 if (data[2] & CESTATUS_EXCEPT) 553 VPRINTK(KERN_INFO, "element 0x%x: asc=0x%x, ascq=0x%x\n", 554 ch->firsts[type]+i, 555 (int)data[4],(int)data[5]); 556 retval = ch_read_element_status 557 (ch, ch->firsts[type]+i,data); 558 if (0 != retval) 559 break; 560 } 561 mutex_unlock(&ch->lock); 562 return retval; 563 } 564 565 /* ------------------------------------------------------------------------ */ 566 567 static void ch_destroy(struct kref *ref) 568 { 569 scsi_changer *ch = container_of(ref, scsi_changer, ref); 570 571 ch->device = NULL; 572 kfree(ch->dt); 573 kfree(ch); 574 } 575 576 static int 577 ch_release(struct inode *inode, struct file *file) 578 { 579 scsi_changer *ch = file->private_data; 580 581 scsi_device_put(ch->device); 582 file->private_data = NULL; 583 kref_put(&ch->ref, ch_destroy); 584 return 0; 585 } 586 587 static int 588 ch_open(struct inode *inode, struct file *file) 589 { 590 scsi_changer *ch; 591 int minor = iminor(inode); 592 593 spin_lock(&ch_index_lock); 594 ch = idr_find(&ch_index_idr, minor); 595 596 if (ch == NULL || !kref_get_unless_zero(&ch->ref)) { 597 spin_unlock(&ch_index_lock); 598 return -ENXIO; 599 } 600 spin_unlock(&ch_index_lock); 601 if (scsi_device_get(ch->device)) { 602 kref_put(&ch->ref, ch_destroy); 603 return -ENXIO; 604 } 605 /* Synchronize with ch_probe() */ 606 mutex_lock(&ch->lock); 607 file->private_data = ch; 608 mutex_unlock(&ch->lock); 609 return 0; 610 } 611 612 static int 613 ch_checkrange(scsi_changer *ch, unsigned int type, unsigned int unit) 614 { 615 if (type >= CH_TYPES || unit >= ch->counts[type]) 616 return -1; 617 return 0; 618 } 619 620 static long ch_ioctl(struct file *file, 621 unsigned int cmd, unsigned long arg) 622 { 623 scsi_changer *ch = file->private_data; 624 int retval; 625 void __user *argp = (void __user *)arg; 626 627 retval = scsi_ioctl_block_when_processing_errors(ch->device, cmd, 628 file->f_flags & O_NDELAY); 629 if (retval) 630 return retval; 631 632 switch (cmd) { 633 case CHIOGPARAMS: 634 { 635 struct changer_params params; 636 637 params.cp_curpicker = 0; 638 params.cp_npickers = ch->counts[CHET_MT]; 639 params.cp_nslots = ch->counts[CHET_ST]; 640 params.cp_nportals = ch->counts[CHET_IE]; 641 params.cp_ndrives = ch->counts[CHET_DT]; 642 643 if (copy_to_user(argp, ¶ms, sizeof(params))) 644 return -EFAULT; 645 return 0; 646 } 647 case CHIOGVPARAMS: 648 { 649 struct changer_vendor_params vparams; 650 651 memset(&vparams,0,sizeof(vparams)); 652 if (ch->counts[CHET_V1]) { 653 vparams.cvp_n1 = ch->counts[CHET_V1]; 654 strncpy(vparams.cvp_label1,vendor_labels[0],16); 655 } 656 if (ch->counts[CHET_V2]) { 657 vparams.cvp_n2 = ch->counts[CHET_V2]; 658 strncpy(vparams.cvp_label2,vendor_labels[1],16); 659 } 660 if (ch->counts[CHET_V3]) { 661 vparams.cvp_n3 = ch->counts[CHET_V3]; 662 strncpy(vparams.cvp_label3,vendor_labels[2],16); 663 } 664 if (ch->counts[CHET_V4]) { 665 vparams.cvp_n4 = ch->counts[CHET_V4]; 666 strncpy(vparams.cvp_label4,vendor_labels[3],16); 667 } 668 if (copy_to_user(argp, &vparams, sizeof(vparams))) 669 return -EFAULT; 670 return 0; 671 } 672 673 case CHIOPOSITION: 674 { 675 struct changer_position pos; 676 677 if (copy_from_user(&pos, argp, sizeof (pos))) 678 return -EFAULT; 679 680 if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) { 681 DPRINTK("CHIOPOSITION: invalid parameter\n"); 682 return -EBADSLT; 683 } 684 mutex_lock(&ch->lock); 685 retval = ch_position(ch,0, 686 ch->firsts[pos.cp_type] + pos.cp_unit, 687 pos.cp_flags & CP_INVERT); 688 mutex_unlock(&ch->lock); 689 return retval; 690 } 691 692 case CHIOMOVE: 693 { 694 struct changer_move mv; 695 696 if (copy_from_user(&mv, argp, sizeof (mv))) 697 return -EFAULT; 698 699 if (0 != ch_checkrange(ch, mv.cm_fromtype, mv.cm_fromunit) || 700 0 != ch_checkrange(ch, mv.cm_totype, mv.cm_tounit )) { 701 DPRINTK("CHIOMOVE: invalid parameter\n"); 702 return -EBADSLT; 703 } 704 705 mutex_lock(&ch->lock); 706 retval = ch_move(ch,0, 707 ch->firsts[mv.cm_fromtype] + mv.cm_fromunit, 708 ch->firsts[mv.cm_totype] + mv.cm_tounit, 709 mv.cm_flags & CM_INVERT); 710 mutex_unlock(&ch->lock); 711 return retval; 712 } 713 714 case CHIOEXCHANGE: 715 { 716 struct changer_exchange mv; 717 718 if (copy_from_user(&mv, argp, sizeof (mv))) 719 return -EFAULT; 720 721 if (0 != ch_checkrange(ch, mv.ce_srctype, mv.ce_srcunit ) || 722 0 != ch_checkrange(ch, mv.ce_fdsttype, mv.ce_fdstunit) || 723 0 != ch_checkrange(ch, mv.ce_sdsttype, mv.ce_sdstunit)) { 724 DPRINTK("CHIOEXCHANGE: invalid parameter\n"); 725 return -EBADSLT; 726 } 727 728 mutex_lock(&ch->lock); 729 retval = ch_exchange 730 (ch,0, 731 ch->firsts[mv.ce_srctype] + mv.ce_srcunit, 732 ch->firsts[mv.ce_fdsttype] + mv.ce_fdstunit, 733 ch->firsts[mv.ce_sdsttype] + mv.ce_sdstunit, 734 mv.ce_flags & CE_INVERT1, mv.ce_flags & CE_INVERT2); 735 mutex_unlock(&ch->lock); 736 return retval; 737 } 738 739 case CHIOGSTATUS: 740 { 741 struct changer_element_status ces; 742 743 if (copy_from_user(&ces, argp, sizeof (ces))) 744 return -EFAULT; 745 if (ces.ces_type < 0 || ces.ces_type >= CH_TYPES) 746 return -EINVAL; 747 748 return ch_gstatus(ch, ces.ces_type, ces.ces_data); 749 } 750 751 case CHIOGELEM: 752 { 753 struct changer_get_element cge; 754 u_char ch_cmd[12]; 755 u_char *buffer; 756 unsigned int elem; 757 int result,i; 758 759 if (copy_from_user(&cge, argp, sizeof (cge))) 760 return -EFAULT; 761 762 if (0 != ch_checkrange(ch, cge.cge_type, cge.cge_unit)) 763 return -EINVAL; 764 elem = ch->firsts[cge.cge_type] + cge.cge_unit; 765 766 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); 767 if (!buffer) 768 return -ENOMEM; 769 mutex_lock(&ch->lock); 770 771 voltag_retry: 772 memset(ch_cmd, 0, sizeof(ch_cmd)); 773 ch_cmd[0] = READ_ELEMENT_STATUS; 774 ch_cmd[1] = ((ch->device->lun & 0x7) << 5) | 775 (ch->voltags ? 0x10 : 0) | 776 ch_elem_to_typecode(ch,elem); 777 ch_cmd[2] = (elem >> 8) & 0xff; 778 ch_cmd[3] = elem & 0xff; 779 ch_cmd[5] = 1; 780 ch_cmd[9] = 255; 781 782 result = ch_do_scsi(ch, ch_cmd, 12, 783 buffer, 256, DMA_FROM_DEVICE); 784 if (!result) { 785 cge.cge_status = buffer[18]; 786 cge.cge_flags = 0; 787 if (buffer[18] & CESTATUS_EXCEPT) { 788 cge.cge_errno = EIO; 789 } 790 if (buffer[25] & 0x80) { 791 cge.cge_flags |= CGE_SRC; 792 if (buffer[25] & 0x40) 793 cge.cge_flags |= CGE_INVERT; 794 elem = (buffer[26]<<8) | buffer[27]; 795 for (i = 0; i < 4; i++) { 796 if (elem >= ch->firsts[i] && 797 elem < ch->firsts[i] + ch->counts[i]) { 798 cge.cge_srctype = i; 799 cge.cge_srcunit = elem-ch->firsts[i]; 800 } 801 } 802 } 803 if ((buffer[22] & 0x30) == 0x30) { 804 cge.cge_flags |= CGE_IDLUN; 805 cge.cge_id = buffer[23]; 806 cge.cge_lun = buffer[22] & 7; 807 } 808 if (buffer[9] & 0x80) { 809 cge.cge_flags |= CGE_PVOLTAG; 810 memcpy(cge.cge_pvoltag,buffer+28,36); 811 } 812 if (buffer[9] & 0x40) { 813 cge.cge_flags |= CGE_AVOLTAG; 814 memcpy(cge.cge_avoltag,buffer+64,36); 815 } 816 } else if (ch->voltags) { 817 ch->voltags = 0; 818 VPRINTK(KERN_INFO, "device has no volume tag support\n"); 819 goto voltag_retry; 820 } 821 kfree(buffer); 822 mutex_unlock(&ch->lock); 823 824 if (copy_to_user(argp, &cge, sizeof (cge))) 825 return -EFAULT; 826 return result; 827 } 828 829 case CHIOINITELEM: 830 { 831 mutex_lock(&ch->lock); 832 retval = ch_init_elem(ch); 833 mutex_unlock(&ch->lock); 834 return retval; 835 } 836 837 case CHIOSVOLTAG: 838 { 839 struct changer_set_voltag csv; 840 int elem; 841 842 if (copy_from_user(&csv, argp, sizeof(csv))) 843 return -EFAULT; 844 845 if (0 != ch_checkrange(ch, csv.csv_type, csv.csv_unit)) { 846 DPRINTK("CHIOSVOLTAG: invalid parameter\n"); 847 return -EBADSLT; 848 } 849 elem = ch->firsts[csv.csv_type] + csv.csv_unit; 850 mutex_lock(&ch->lock); 851 retval = ch_set_voltag(ch, elem, 852 csv.csv_flags & CSV_AVOLTAG, 853 csv.csv_flags & CSV_CLEARTAG, 854 csv.csv_voltag); 855 mutex_unlock(&ch->lock); 856 return retval; 857 } 858 859 default: 860 return scsi_ioctl(ch->device, cmd, argp); 861 862 } 863 } 864 865 #ifdef CONFIG_COMPAT 866 867 struct changer_element_status32 { 868 int ces_type; 869 compat_uptr_t ces_data; 870 }; 871 #define CHIOGSTATUS32 _IOW('c', 8,struct changer_element_status32) 872 873 static long ch_ioctl_compat(struct file * file, 874 unsigned int cmd, unsigned long arg) 875 { 876 scsi_changer *ch = file->private_data; 877 int retval = scsi_ioctl_block_when_processing_errors(ch->device, cmd, 878 file->f_flags & O_NDELAY); 879 if (retval) 880 return retval; 881 882 switch (cmd) { 883 case CHIOGPARAMS: 884 case CHIOGVPARAMS: 885 case CHIOPOSITION: 886 case CHIOMOVE: 887 case CHIOEXCHANGE: 888 case CHIOGELEM: 889 case CHIOINITELEM: 890 case CHIOSVOLTAG: 891 /* compatible */ 892 return ch_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); 893 case CHIOGSTATUS32: 894 { 895 struct changer_element_status32 ces32; 896 unsigned char __user *data; 897 898 if (copy_from_user(&ces32, (void __user *)arg, sizeof (ces32))) 899 return -EFAULT; 900 if (ces32.ces_type < 0 || ces32.ces_type >= CH_TYPES) 901 return -EINVAL; 902 903 data = compat_ptr(ces32.ces_data); 904 return ch_gstatus(ch, ces32.ces_type, data); 905 } 906 default: 907 return scsi_compat_ioctl(ch->device, cmd, compat_ptr(arg)); 908 909 } 910 } 911 #endif 912 913 /* ------------------------------------------------------------------------ */ 914 915 static int ch_probe(struct device *dev) 916 { 917 struct scsi_device *sd = to_scsi_device(dev); 918 struct device *class_dev; 919 int ret; 920 scsi_changer *ch; 921 922 if (sd->type != TYPE_MEDIUM_CHANGER) 923 return -ENODEV; 924 925 ch = kzalloc(sizeof(*ch), GFP_KERNEL); 926 if (NULL == ch) 927 return -ENOMEM; 928 929 idr_preload(GFP_KERNEL); 930 spin_lock(&ch_index_lock); 931 ret = idr_alloc(&ch_index_idr, ch, 0, CH_MAX_DEVS + 1, GFP_NOWAIT); 932 spin_unlock(&ch_index_lock); 933 idr_preload_end(); 934 935 if (ret < 0) { 936 if (ret == -ENOSPC) 937 ret = -ENODEV; 938 goto free_ch; 939 } 940 941 ch->minor = ret; 942 sprintf(ch->name,"ch%d",ch->minor); 943 ret = scsi_device_get(sd); 944 if (ret) { 945 sdev_printk(KERN_WARNING, sd, "ch%d: failed to get device\n", 946 ch->minor); 947 goto remove_idr; 948 } 949 950 mutex_init(&ch->lock); 951 kref_init(&ch->ref); 952 ch->device = sd; 953 class_dev = device_create(ch_sysfs_class, dev, 954 MKDEV(SCSI_CHANGER_MAJOR, ch->minor), ch, 955 "s%s", ch->name); 956 if (IS_ERR(class_dev)) { 957 sdev_printk(KERN_WARNING, sd, "ch%d: device_create failed\n", 958 ch->minor); 959 ret = PTR_ERR(class_dev); 960 goto put_device; 961 } 962 963 mutex_lock(&ch->lock); 964 ret = ch_readconfig(ch); 965 if (ret) { 966 mutex_unlock(&ch->lock); 967 goto destroy_dev; 968 } 969 if (init) 970 ch_init_elem(ch); 971 972 mutex_unlock(&ch->lock); 973 dev_set_drvdata(dev, ch); 974 sdev_printk(KERN_INFO, sd, "Attached scsi changer %s\n", ch->name); 975 976 return 0; 977 destroy_dev: 978 device_destroy(ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR, ch->minor)); 979 put_device: 980 scsi_device_put(sd); 981 remove_idr: 982 idr_remove(&ch_index_idr, ch->minor); 983 free_ch: 984 kfree(ch); 985 return ret; 986 } 987 988 static int ch_remove(struct device *dev) 989 { 990 scsi_changer *ch = dev_get_drvdata(dev); 991 992 spin_lock(&ch_index_lock); 993 idr_remove(&ch_index_idr, ch->minor); 994 dev_set_drvdata(dev, NULL); 995 spin_unlock(&ch_index_lock); 996 997 device_destroy(ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR,ch->minor)); 998 scsi_device_put(ch->device); 999 kref_put(&ch->ref, ch_destroy); 1000 return 0; 1001 } 1002 1003 static struct scsi_driver ch_template = { 1004 .gendrv = { 1005 .name = "ch", 1006 .owner = THIS_MODULE, 1007 .probe = ch_probe, 1008 .remove = ch_remove, 1009 }, 1010 }; 1011 1012 static const struct file_operations changer_fops = { 1013 .owner = THIS_MODULE, 1014 .open = ch_open, 1015 .release = ch_release, 1016 .unlocked_ioctl = ch_ioctl, 1017 #ifdef CONFIG_COMPAT 1018 .compat_ioctl = ch_ioctl_compat, 1019 #endif 1020 .llseek = noop_llseek, 1021 }; 1022 1023 static int __init init_ch_module(void) 1024 { 1025 int rc; 1026 1027 printk(KERN_INFO "SCSI Media Changer driver v" VERSION " \n"); 1028 ch_sysfs_class = class_create(THIS_MODULE, "scsi_changer"); 1029 if (IS_ERR(ch_sysfs_class)) { 1030 rc = PTR_ERR(ch_sysfs_class); 1031 return rc; 1032 } 1033 rc = register_chrdev(SCSI_CHANGER_MAJOR,"ch",&changer_fops); 1034 if (rc < 0) { 1035 printk("Unable to get major %d for SCSI-Changer\n", 1036 SCSI_CHANGER_MAJOR); 1037 goto fail1; 1038 } 1039 rc = scsi_register_driver(&ch_template.gendrv); 1040 if (rc < 0) 1041 goto fail2; 1042 return 0; 1043 1044 fail2: 1045 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch"); 1046 fail1: 1047 class_destroy(ch_sysfs_class); 1048 return rc; 1049 } 1050 1051 static void __exit exit_ch_module(void) 1052 { 1053 scsi_unregister_driver(&ch_template.gendrv); 1054 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch"); 1055 class_destroy(ch_sysfs_class); 1056 idr_destroy(&ch_index_idr); 1057 } 1058 1059 module_init(init_ch_module); 1060 module_exit(exit_ch_module); 1061 1062 /* 1063 * Local variables: 1064 * c-basic-offset: 8 1065 * End: 1066 */ 1067