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 DEFINE_MUTEX(ch_mutex); 48 static int init = 1; 49 module_param(init, int, 0444); 50 MODULE_PARM_DESC(init, \ 51 "initialize element status on driver load (default: on)"); 52 53 static int timeout_move = 300; 54 module_param(timeout_move, int, 0644); 55 MODULE_PARM_DESC(timeout_move,"timeout for move commands " 56 "(default: 300 seconds)"); 57 58 static int timeout_init = 3600; 59 module_param(timeout_init, int, 0644); 60 MODULE_PARM_DESC(timeout_init,"timeout for INITIALIZE ELEMENT STATUS " 61 "(default: 3600 seconds)"); 62 63 static int verbose = 1; 64 module_param(verbose, int, 0644); 65 MODULE_PARM_DESC(verbose,"be verbose (default: on)"); 66 67 static int debug = 0; 68 module_param(debug, int, 0644); 69 MODULE_PARM_DESC(debug,"enable/disable debug messages, also prints more " 70 "detailed sense codes on scsi errors (default: off)"); 71 72 static int dt_id[CH_DT_MAX] = { [ 0 ... (CH_DT_MAX-1) ] = -1 }; 73 static int dt_lun[CH_DT_MAX]; 74 module_param_array(dt_id, int, NULL, 0444); 75 module_param_array(dt_lun, int, NULL, 0444); 76 77 /* tell the driver about vendor-specific slots */ 78 static int vendor_firsts[CH_TYPES-4]; 79 static int vendor_counts[CH_TYPES-4]; 80 module_param_array(vendor_firsts, int, NULL, 0444); 81 module_param_array(vendor_counts, int, NULL, 0444); 82 83 static const char * vendor_labels[CH_TYPES-4] = { 84 "v0", "v1", "v2", "v3" 85 }; 86 // module_param_string_array(vendor_labels, NULL, 0444); 87 88 #define ch_printk(prefix, ch, fmt, a...) \ 89 sdev_prefix_printk(prefix, (ch)->device, (ch)->name, fmt, ##a) 90 91 #define DPRINTK(fmt, arg...) \ 92 do { \ 93 if (debug) \ 94 ch_printk(KERN_DEBUG, ch, fmt, ##arg); \ 95 } while (0) 96 #define VPRINTK(level, fmt, arg...) \ 97 do { \ 98 if (verbose) \ 99 ch_printk(level, ch, fmt, ##arg); \ 100 } while (0) 101 102 /* ------------------------------------------------------------------- */ 103 104 #define MAX_RETRIES 1 105 106 static struct class * ch_sysfs_class; 107 108 typedef struct { 109 struct kref ref; 110 struct list_head list; 111 int minor; 112 char name[8]; 113 struct scsi_device *device; 114 struct scsi_device **dt; /* ptrs to data transfer elements */ 115 u_int firsts[CH_TYPES]; 116 u_int counts[CH_TYPES]; 117 u_int unit_attention; 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 buflength, 189 enum dma_data_direction direction) 190 { 191 int errno, retries = 0, timeout, result; 192 struct scsi_sense_hdr sshdr; 193 194 timeout = (cmd[0] == INITIALIZE_ELEMENT_STATUS) 195 ? timeout_init : timeout_move; 196 197 retry: 198 errno = 0; 199 result = scsi_execute_req(ch->device, cmd, direction, buffer, 200 buflength, &sshdr, timeout * HZ, 201 MAX_RETRIES, NULL); 202 203 if (driver_byte(result) == DRIVER_SENSE) { 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 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 mutex_lock(&ch_mutex); 594 spin_lock(&ch_index_lock); 595 ch = idr_find(&ch_index_idr, minor); 596 597 if (NULL == ch || scsi_device_get(ch->device)) { 598 spin_unlock(&ch_index_lock); 599 mutex_unlock(&ch_mutex); 600 return -ENXIO; 601 } 602 kref_get(&ch->ref); 603 spin_unlock(&ch_index_lock); 604 605 file->private_data = ch; 606 mutex_unlock(&ch_mutex); 607 return 0; 608 } 609 610 static int 611 ch_checkrange(scsi_changer *ch, unsigned int type, unsigned int unit) 612 { 613 if (type >= CH_TYPES || unit >= ch->counts[type]) 614 return -1; 615 return 0; 616 } 617 618 static long ch_ioctl(struct file *file, 619 unsigned int cmd, unsigned long arg) 620 { 621 scsi_changer *ch = file->private_data; 622 int retval; 623 void __user *argp = (void __user *)arg; 624 625 retval = scsi_ioctl_block_when_processing_errors(ch->device, cmd, 626 file->f_flags & O_NDELAY); 627 if (retval) 628 return retval; 629 630 switch (cmd) { 631 case CHIOGPARAMS: 632 { 633 struct changer_params params; 634 635 params.cp_curpicker = 0; 636 params.cp_npickers = ch->counts[CHET_MT]; 637 params.cp_nslots = ch->counts[CHET_ST]; 638 params.cp_nportals = ch->counts[CHET_IE]; 639 params.cp_ndrives = ch->counts[CHET_DT]; 640 641 if (copy_to_user(argp, ¶ms, sizeof(params))) 642 return -EFAULT; 643 return 0; 644 } 645 case CHIOGVPARAMS: 646 { 647 struct changer_vendor_params vparams; 648 649 memset(&vparams,0,sizeof(vparams)); 650 if (ch->counts[CHET_V1]) { 651 vparams.cvp_n1 = ch->counts[CHET_V1]; 652 strncpy(vparams.cvp_label1,vendor_labels[0],16); 653 } 654 if (ch->counts[CHET_V2]) { 655 vparams.cvp_n2 = ch->counts[CHET_V2]; 656 strncpy(vparams.cvp_label2,vendor_labels[1],16); 657 } 658 if (ch->counts[CHET_V3]) { 659 vparams.cvp_n3 = ch->counts[CHET_V3]; 660 strncpy(vparams.cvp_label3,vendor_labels[2],16); 661 } 662 if (ch->counts[CHET_V4]) { 663 vparams.cvp_n4 = ch->counts[CHET_V4]; 664 strncpy(vparams.cvp_label4,vendor_labels[3],16); 665 } 666 if (copy_to_user(argp, &vparams, sizeof(vparams))) 667 return -EFAULT; 668 return 0; 669 } 670 671 case CHIOPOSITION: 672 { 673 struct changer_position pos; 674 675 if (copy_from_user(&pos, argp, sizeof (pos))) 676 return -EFAULT; 677 678 if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) { 679 DPRINTK("CHIOPOSITION: invalid parameter\n"); 680 return -EBADSLT; 681 } 682 mutex_lock(&ch->lock); 683 retval = ch_position(ch,0, 684 ch->firsts[pos.cp_type] + pos.cp_unit, 685 pos.cp_flags & CP_INVERT); 686 mutex_unlock(&ch->lock); 687 return retval; 688 } 689 690 case CHIOMOVE: 691 { 692 struct changer_move mv; 693 694 if (copy_from_user(&mv, argp, sizeof (mv))) 695 return -EFAULT; 696 697 if (0 != ch_checkrange(ch, mv.cm_fromtype, mv.cm_fromunit) || 698 0 != ch_checkrange(ch, mv.cm_totype, mv.cm_tounit )) { 699 DPRINTK("CHIOMOVE: invalid parameter\n"); 700 return -EBADSLT; 701 } 702 703 mutex_lock(&ch->lock); 704 retval = ch_move(ch,0, 705 ch->firsts[mv.cm_fromtype] + mv.cm_fromunit, 706 ch->firsts[mv.cm_totype] + mv.cm_tounit, 707 mv.cm_flags & CM_INVERT); 708 mutex_unlock(&ch->lock); 709 return retval; 710 } 711 712 case CHIOEXCHANGE: 713 { 714 struct changer_exchange mv; 715 716 if (copy_from_user(&mv, argp, sizeof (mv))) 717 return -EFAULT; 718 719 if (0 != ch_checkrange(ch, mv.ce_srctype, mv.ce_srcunit ) || 720 0 != ch_checkrange(ch, mv.ce_fdsttype, mv.ce_fdstunit) || 721 0 != ch_checkrange(ch, mv.ce_sdsttype, mv.ce_sdstunit)) { 722 DPRINTK("CHIOEXCHANGE: invalid parameter\n"); 723 return -EBADSLT; 724 } 725 726 mutex_lock(&ch->lock); 727 retval = ch_exchange 728 (ch,0, 729 ch->firsts[mv.ce_srctype] + mv.ce_srcunit, 730 ch->firsts[mv.ce_fdsttype] + mv.ce_fdstunit, 731 ch->firsts[mv.ce_sdsttype] + mv.ce_sdstunit, 732 mv.ce_flags & CE_INVERT1, mv.ce_flags & CE_INVERT2); 733 mutex_unlock(&ch->lock); 734 return retval; 735 } 736 737 case CHIOGSTATUS: 738 { 739 struct changer_element_status ces; 740 741 if (copy_from_user(&ces, argp, sizeof (ces))) 742 return -EFAULT; 743 if (ces.ces_type < 0 || ces.ces_type >= CH_TYPES) 744 return -EINVAL; 745 746 return ch_gstatus(ch, ces.ces_type, ces.ces_data); 747 } 748 749 case CHIOGELEM: 750 { 751 struct changer_get_element cge; 752 u_char ch_cmd[12]; 753 u_char *buffer; 754 unsigned int elem; 755 int result,i; 756 757 if (copy_from_user(&cge, argp, sizeof (cge))) 758 return -EFAULT; 759 760 if (0 != ch_checkrange(ch, cge.cge_type, cge.cge_unit)) 761 return -EINVAL; 762 elem = ch->firsts[cge.cge_type] + cge.cge_unit; 763 764 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); 765 if (!buffer) 766 return -ENOMEM; 767 mutex_lock(&ch->lock); 768 769 voltag_retry: 770 memset(ch_cmd, 0, sizeof(ch_cmd)); 771 ch_cmd[0] = READ_ELEMENT_STATUS; 772 ch_cmd[1] = ((ch->device->lun & 0x7) << 5) | 773 (ch->voltags ? 0x10 : 0) | 774 ch_elem_to_typecode(ch,elem); 775 ch_cmd[2] = (elem >> 8) & 0xff; 776 ch_cmd[3] = elem & 0xff; 777 ch_cmd[5] = 1; 778 ch_cmd[9] = 255; 779 780 result = ch_do_scsi(ch, ch_cmd, 12, 781 buffer, 256, DMA_FROM_DEVICE); 782 if (!result) { 783 cge.cge_status = buffer[18]; 784 cge.cge_flags = 0; 785 if (buffer[18] & CESTATUS_EXCEPT) { 786 cge.cge_errno = EIO; 787 } 788 if (buffer[25] & 0x80) { 789 cge.cge_flags |= CGE_SRC; 790 if (buffer[25] & 0x40) 791 cge.cge_flags |= CGE_INVERT; 792 elem = (buffer[26]<<8) | buffer[27]; 793 for (i = 0; i < 4; i++) { 794 if (elem >= ch->firsts[i] && 795 elem < ch->firsts[i] + ch->counts[i]) { 796 cge.cge_srctype = i; 797 cge.cge_srcunit = elem-ch->firsts[i]; 798 } 799 } 800 } 801 if ((buffer[22] & 0x30) == 0x30) { 802 cge.cge_flags |= CGE_IDLUN; 803 cge.cge_id = buffer[23]; 804 cge.cge_lun = buffer[22] & 7; 805 } 806 if (buffer[9] & 0x80) { 807 cge.cge_flags |= CGE_PVOLTAG; 808 memcpy(cge.cge_pvoltag,buffer+28,36); 809 } 810 if (buffer[9] & 0x40) { 811 cge.cge_flags |= CGE_AVOLTAG; 812 memcpy(cge.cge_avoltag,buffer+64,36); 813 } 814 } else if (ch->voltags) { 815 ch->voltags = 0; 816 VPRINTK(KERN_INFO, "device has no volume tag support\n"); 817 goto voltag_retry; 818 } 819 kfree(buffer); 820 mutex_unlock(&ch->lock); 821 822 if (copy_to_user(argp, &cge, sizeof (cge))) 823 return -EFAULT; 824 return result; 825 } 826 827 case CHIOINITELEM: 828 { 829 mutex_lock(&ch->lock); 830 retval = ch_init_elem(ch); 831 mutex_unlock(&ch->lock); 832 return retval; 833 } 834 835 case CHIOSVOLTAG: 836 { 837 struct changer_set_voltag csv; 838 int elem; 839 840 if (copy_from_user(&csv, argp, sizeof(csv))) 841 return -EFAULT; 842 843 if (0 != ch_checkrange(ch, csv.csv_type, csv.csv_unit)) { 844 DPRINTK("CHIOSVOLTAG: invalid parameter\n"); 845 return -EBADSLT; 846 } 847 elem = ch->firsts[csv.csv_type] + csv.csv_unit; 848 mutex_lock(&ch->lock); 849 retval = ch_set_voltag(ch, elem, 850 csv.csv_flags & CSV_AVOLTAG, 851 csv.csv_flags & CSV_CLEARTAG, 852 csv.csv_voltag); 853 mutex_unlock(&ch->lock); 854 return retval; 855 } 856 857 default: 858 return scsi_ioctl(ch->device, cmd, argp); 859 860 } 861 } 862 863 #ifdef CONFIG_COMPAT 864 865 struct changer_element_status32 { 866 int ces_type; 867 compat_uptr_t ces_data; 868 }; 869 #define CHIOGSTATUS32 _IOW('c', 8,struct changer_element_status32) 870 871 static long ch_ioctl_compat(struct file * file, 872 unsigned int cmd, unsigned long arg) 873 { 874 scsi_changer *ch = file->private_data; 875 int retval = scsi_ioctl_block_when_processing_errors(ch->device, cmd, 876 file->f_flags & O_NDELAY); 877 if (retval) 878 return retval; 879 880 switch (cmd) { 881 case CHIOGPARAMS: 882 case CHIOGVPARAMS: 883 case CHIOPOSITION: 884 case CHIOMOVE: 885 case CHIOEXCHANGE: 886 case CHIOGELEM: 887 case CHIOINITELEM: 888 case CHIOSVOLTAG: 889 /* compatible */ 890 return ch_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); 891 case CHIOGSTATUS32: 892 { 893 struct changer_element_status32 ces32; 894 unsigned char __user *data; 895 896 if (copy_from_user(&ces32, (void __user *)arg, sizeof (ces32))) 897 return -EFAULT; 898 if (ces32.ces_type < 0 || ces32.ces_type >= CH_TYPES) 899 return -EINVAL; 900 901 data = compat_ptr(ces32.ces_data); 902 return ch_gstatus(ch, ces32.ces_type, data); 903 } 904 default: 905 return scsi_compat_ioctl(ch->device, cmd, compat_ptr(arg)); 906 907 } 908 } 909 #endif 910 911 /* ------------------------------------------------------------------------ */ 912 913 static int ch_probe(struct device *dev) 914 { 915 struct scsi_device *sd = to_scsi_device(dev); 916 struct device *class_dev; 917 int ret; 918 scsi_changer *ch; 919 920 if (sd->type != TYPE_MEDIUM_CHANGER) 921 return -ENODEV; 922 923 ch = kzalloc(sizeof(*ch), GFP_KERNEL); 924 if (NULL == ch) 925 return -ENOMEM; 926 927 idr_preload(GFP_KERNEL); 928 spin_lock(&ch_index_lock); 929 ret = idr_alloc(&ch_index_idr, ch, 0, CH_MAX_DEVS + 1, GFP_NOWAIT); 930 spin_unlock(&ch_index_lock); 931 idr_preload_end(); 932 933 if (ret < 0) { 934 if (ret == -ENOSPC) 935 ret = -ENODEV; 936 goto free_ch; 937 } 938 939 ch->minor = ret; 940 sprintf(ch->name,"ch%d",ch->minor); 941 942 class_dev = device_create(ch_sysfs_class, dev, 943 MKDEV(SCSI_CHANGER_MAJOR, ch->minor), ch, 944 "s%s", ch->name); 945 if (IS_ERR(class_dev)) { 946 sdev_printk(KERN_WARNING, sd, "ch%d: device_create failed\n", 947 ch->minor); 948 ret = PTR_ERR(class_dev); 949 goto remove_idr; 950 } 951 952 mutex_init(&ch->lock); 953 kref_init(&ch->ref); 954 ch->device = sd; 955 ret = ch_readconfig(ch); 956 if (ret) 957 goto destroy_dev; 958 if (init) 959 ch_init_elem(ch); 960 961 dev_set_drvdata(dev, ch); 962 sdev_printk(KERN_INFO, sd, "Attached scsi changer %s\n", ch->name); 963 964 return 0; 965 destroy_dev: 966 device_destroy(ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR, ch->minor)); 967 remove_idr: 968 idr_remove(&ch_index_idr, ch->minor); 969 free_ch: 970 kfree(ch); 971 return ret; 972 } 973 974 static int ch_remove(struct device *dev) 975 { 976 scsi_changer *ch = dev_get_drvdata(dev); 977 978 spin_lock(&ch_index_lock); 979 idr_remove(&ch_index_idr, ch->minor); 980 spin_unlock(&ch_index_lock); 981 982 device_destroy(ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR,ch->minor)); 983 kref_put(&ch->ref, ch_destroy); 984 return 0; 985 } 986 987 static struct scsi_driver ch_template = { 988 .gendrv = { 989 .name = "ch", 990 .owner = THIS_MODULE, 991 .probe = ch_probe, 992 .remove = ch_remove, 993 }, 994 }; 995 996 static const struct file_operations changer_fops = { 997 .owner = THIS_MODULE, 998 .open = ch_open, 999 .release = ch_release, 1000 .unlocked_ioctl = ch_ioctl, 1001 #ifdef CONFIG_COMPAT 1002 .compat_ioctl = ch_ioctl_compat, 1003 #endif 1004 .llseek = noop_llseek, 1005 }; 1006 1007 static int __init init_ch_module(void) 1008 { 1009 int rc; 1010 1011 printk(KERN_INFO "SCSI Media Changer driver v" VERSION " \n"); 1012 ch_sysfs_class = class_create(THIS_MODULE, "scsi_changer"); 1013 if (IS_ERR(ch_sysfs_class)) { 1014 rc = PTR_ERR(ch_sysfs_class); 1015 return rc; 1016 } 1017 rc = register_chrdev(SCSI_CHANGER_MAJOR,"ch",&changer_fops); 1018 if (rc < 0) { 1019 printk("Unable to get major %d for SCSI-Changer\n", 1020 SCSI_CHANGER_MAJOR); 1021 goto fail1; 1022 } 1023 rc = scsi_register_driver(&ch_template.gendrv); 1024 if (rc < 0) 1025 goto fail2; 1026 return 0; 1027 1028 fail2: 1029 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch"); 1030 fail1: 1031 class_destroy(ch_sysfs_class); 1032 return rc; 1033 } 1034 1035 static void __exit exit_ch_module(void) 1036 { 1037 scsi_unregister_driver(&ch_template.gendrv); 1038 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch"); 1039 class_destroy(ch_sysfs_class); 1040 idr_destroy(&ch_index_idr); 1041 } 1042 1043 module_init(init_ch_module); 1044 module_exit(exit_ch_module); 1045 1046 /* 1047 * Local variables: 1048 * c-basic-offset: 8 1049 * End: 1050 */ 1051