1 /* 2 * SCSI Media Changer device driver for Linux 2.6 3 * 4 * (c) 1996-2003 Gerd Knorr <kraxel@bytesex.org> 5 * 6 */ 7 8 #define VERSION "0.25" 9 10 #include <linux/module.h> 11 #include <linux/init.h> 12 #include <linux/fs.h> 13 #include <linux/kernel.h> 14 #include <linux/mm.h> 15 #include <linux/major.h> 16 #include <linux/string.h> 17 #include <linux/errno.h> 18 #include <linux/interrupt.h> 19 #include <linux/blkdev.h> 20 #include <linux/completion.h> 21 #include <linux/compat.h> 22 #include <linux/chio.h> /* here are all the ioctls */ 23 #include <linux/mutex.h> 24 #include <linux/idr.h> 25 #include <linux/slab.h> 26 27 #include <scsi/scsi.h> 28 #include <scsi/scsi_cmnd.h> 29 #include <scsi/scsi_driver.h> 30 #include <scsi/scsi_ioctl.h> 31 #include <scsi/scsi_host.h> 32 #include <scsi/scsi_device.h> 33 #include <scsi/scsi_eh.h> 34 #include <scsi/scsi_dbg.h> 35 36 #define CH_DT_MAX 16 37 #define CH_TYPES 8 38 #define CH_MAX_DEVS 128 39 40 MODULE_DESCRIPTION("device driver for scsi media changer devices"); 41 MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org>"); 42 MODULE_LICENSE("GPL"); 43 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_CHANGER_MAJOR); 44 MODULE_ALIAS_SCSI_DEVICE(TYPE_MEDIUM_CHANGER); 45 46 static DEFINE_MUTEX(ch_mutex); 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_printk(prefix, (ch)->device, "[%s] " fmt, \ 89 (ch)->name, ##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 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, 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 if (debug) { 199 DPRINTK("command: "); 200 __scsi_print_command(cmd); 201 } 202 203 result = scsi_execute_req(ch->device, cmd, direction, buffer, 204 buflength, &sshdr, timeout * HZ, 205 MAX_RETRIES, NULL); 206 207 DPRINTK("result: 0x%x\n",result); 208 if (driver_byte(result) & DRIVER_SENSE) { 209 if (debug) 210 scsi_print_sense_hdr(ch->name, &sshdr); 211 errno = ch_find_errno(&sshdr); 212 213 switch(sshdr.sense_key) { 214 case UNIT_ATTENTION: 215 ch->unit_attention = 1; 216 if (retries++ < 3) 217 goto retry; 218 break; 219 } 220 } 221 return errno; 222 } 223 224 /* ------------------------------------------------------------------------ */ 225 226 static int 227 ch_elem_to_typecode(scsi_changer *ch, u_int elem) 228 { 229 int i; 230 231 for (i = 0; i < CH_TYPES; i++) { 232 if (elem >= ch->firsts[i] && 233 elem < ch->firsts[i] + 234 ch->counts[i]) 235 return i+1; 236 } 237 return 0; 238 } 239 240 static int 241 ch_read_element_status(scsi_changer *ch, u_int elem, char *data) 242 { 243 u_char cmd[12]; 244 u_char *buffer; 245 int result; 246 247 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); 248 if(!buffer) 249 return -ENOMEM; 250 251 retry: 252 memset(cmd,0,sizeof(cmd)); 253 cmd[0] = READ_ELEMENT_STATUS; 254 cmd[1] = ((ch->device->lun & 0x7) << 5) | 255 (ch->voltags ? 0x10 : 0) | 256 ch_elem_to_typecode(ch,elem); 257 cmd[2] = (elem >> 8) & 0xff; 258 cmd[3] = elem & 0xff; 259 cmd[5] = 1; 260 cmd[9] = 255; 261 if (0 == (result = ch_do_scsi(ch, cmd, buffer, 256, DMA_FROM_DEVICE))) { 262 if (((buffer[16] << 8) | buffer[17]) != elem) { 263 DPRINTK("asked for element 0x%02x, got 0x%02x\n", 264 elem,(buffer[16] << 8) | buffer[17]); 265 kfree(buffer); 266 return -EIO; 267 } 268 memcpy(data,buffer+16,16); 269 } else { 270 if (ch->voltags) { 271 ch->voltags = 0; 272 VPRINTK(KERN_INFO, "device has no volume tag support\n"); 273 goto retry; 274 } 275 DPRINTK("READ ELEMENT STATUS for element 0x%x failed\n",elem); 276 } 277 kfree(buffer); 278 return result; 279 } 280 281 static int 282 ch_init_elem(scsi_changer *ch) 283 { 284 int err; 285 u_char cmd[6]; 286 287 VPRINTK(KERN_INFO, "INITIALIZE ELEMENT STATUS, may take some time ...\n"); 288 memset(cmd,0,sizeof(cmd)); 289 cmd[0] = INITIALIZE_ELEMENT_STATUS; 290 cmd[1] = (ch->device->lun & 0x7) << 5; 291 err = ch_do_scsi(ch, cmd, NULL, 0, DMA_NONE); 292 VPRINTK(KERN_INFO, "... finished\n"); 293 return err; 294 } 295 296 static int 297 ch_readconfig(scsi_changer *ch) 298 { 299 u_char cmd[10], data[16]; 300 u_char *buffer; 301 int result,id,lun,i; 302 u_int elem; 303 304 buffer = kzalloc(512, GFP_KERNEL | GFP_DMA); 305 if (!buffer) 306 return -ENOMEM; 307 308 memset(cmd,0,sizeof(cmd)); 309 cmd[0] = MODE_SENSE; 310 cmd[1] = (ch->device->lun & 0x7) << 5; 311 cmd[2] = 0x1d; 312 cmd[4] = 255; 313 result = ch_do_scsi(ch, cmd, buffer, 255, DMA_FROM_DEVICE); 314 if (0 != result) { 315 cmd[1] |= (1<<3); 316 result = ch_do_scsi(ch, cmd, buffer, 255, DMA_FROM_DEVICE); 317 } 318 if (0 == result) { 319 ch->firsts[CHET_MT] = 320 (buffer[buffer[3]+ 6] << 8) | buffer[buffer[3]+ 7]; 321 ch->counts[CHET_MT] = 322 (buffer[buffer[3]+ 8] << 8) | buffer[buffer[3]+ 9]; 323 ch->firsts[CHET_ST] = 324 (buffer[buffer[3]+10] << 8) | buffer[buffer[3]+11]; 325 ch->counts[CHET_ST] = 326 (buffer[buffer[3]+12] << 8) | buffer[buffer[3]+13]; 327 ch->firsts[CHET_IE] = 328 (buffer[buffer[3]+14] << 8) | buffer[buffer[3]+15]; 329 ch->counts[CHET_IE] = 330 (buffer[buffer[3]+16] << 8) | buffer[buffer[3]+17]; 331 ch->firsts[CHET_DT] = 332 (buffer[buffer[3]+18] << 8) | buffer[buffer[3]+19]; 333 ch->counts[CHET_DT] = 334 (buffer[buffer[3]+20] << 8) | buffer[buffer[3]+21]; 335 VPRINTK(KERN_INFO, "type #1 (mt): 0x%x+%d [medium transport]\n", 336 ch->firsts[CHET_MT], 337 ch->counts[CHET_MT]); 338 VPRINTK(KERN_INFO, "type #2 (st): 0x%x+%d [storage]\n", 339 ch->firsts[CHET_ST], 340 ch->counts[CHET_ST]); 341 VPRINTK(KERN_INFO, "type #3 (ie): 0x%x+%d [import/export]\n", 342 ch->firsts[CHET_IE], 343 ch->counts[CHET_IE]); 344 VPRINTK(KERN_INFO, "type #4 (dt): 0x%x+%d [data transfer]\n", 345 ch->firsts[CHET_DT], 346 ch->counts[CHET_DT]); 347 } else { 348 VPRINTK(KERN_INFO, "reading element address assigment page failed!\n"); 349 } 350 351 /* vendor specific element types */ 352 for (i = 0; i < 4; i++) { 353 if (0 == vendor_counts[i]) 354 continue; 355 if (NULL == vendor_labels[i]) 356 continue; 357 ch->firsts[CHET_V1+i] = vendor_firsts[i]; 358 ch->counts[CHET_V1+i] = vendor_counts[i]; 359 VPRINTK(KERN_INFO, "type #%d (v%d): 0x%x+%d [%s, vendor specific]\n", 360 i+5,i+1,vendor_firsts[i],vendor_counts[i], 361 vendor_labels[i]); 362 } 363 364 /* look up the devices of the data transfer elements */ 365 ch->dt = kcalloc(ch->counts[CHET_DT], sizeof(*ch->dt), 366 GFP_KERNEL); 367 368 if (!ch->dt) { 369 kfree(buffer); 370 return -ENOMEM; 371 } 372 373 for (elem = 0; elem < ch->counts[CHET_DT]; elem++) { 374 id = -1; 375 lun = 0; 376 if (elem < CH_DT_MAX && -1 != dt_id[elem]) { 377 id = dt_id[elem]; 378 lun = dt_lun[elem]; 379 VPRINTK(KERN_INFO, "dt 0x%x: [insmod option] ", 380 elem+ch->firsts[CHET_DT]); 381 } else if (0 != ch_read_element_status 382 (ch,elem+ch->firsts[CHET_DT],data)) { 383 VPRINTK(KERN_INFO, "dt 0x%x: READ ELEMENT STATUS failed\n", 384 elem+ch->firsts[CHET_DT]); 385 } else { 386 VPRINTK(KERN_INFO, "dt 0x%x: ",elem+ch->firsts[CHET_DT]); 387 if (data[6] & 0x80) { 388 VPRINTK(KERN_CONT, "not this SCSI bus\n"); 389 ch->dt[elem] = NULL; 390 } else if (0 == (data[6] & 0x30)) { 391 VPRINTK(KERN_CONT, "ID/LUN unknown\n"); 392 ch->dt[elem] = NULL; 393 } else { 394 id = ch->device->id; 395 lun = 0; 396 if (data[6] & 0x20) id = data[7]; 397 if (data[6] & 0x10) lun = data[6] & 7; 398 } 399 } 400 if (-1 != id) { 401 VPRINTK(KERN_CONT, "ID %i, LUN %i, ",id,lun); 402 ch->dt[elem] = 403 scsi_device_lookup(ch->device->host, 404 ch->device->channel, 405 id,lun); 406 if (!ch->dt[elem]) { 407 /* should not happen */ 408 VPRINTK(KERN_CONT, "Huh? device not found!\n"); 409 } else { 410 VPRINTK(KERN_CONT, "name: %8.8s %16.16s %4.4s\n", 411 ch->dt[elem]->vendor, 412 ch->dt[elem]->model, 413 ch->dt[elem]->rev); 414 } 415 } 416 } 417 ch->voltags = 1; 418 kfree(buffer); 419 420 return 0; 421 } 422 423 /* ------------------------------------------------------------------------ */ 424 425 static int 426 ch_position(scsi_changer *ch, u_int trans, u_int elem, int rotate) 427 { 428 u_char cmd[10]; 429 430 DPRINTK("position: 0x%x\n",elem); 431 if (0 == trans) 432 trans = ch->firsts[CHET_MT]; 433 memset(cmd,0,sizeof(cmd)); 434 cmd[0] = POSITION_TO_ELEMENT; 435 cmd[1] = (ch->device->lun & 0x7) << 5; 436 cmd[2] = (trans >> 8) & 0xff; 437 cmd[3] = trans & 0xff; 438 cmd[4] = (elem >> 8) & 0xff; 439 cmd[5] = elem & 0xff; 440 cmd[8] = rotate ? 1 : 0; 441 return ch_do_scsi(ch, cmd, NULL, 0, DMA_NONE); 442 } 443 444 static int 445 ch_move(scsi_changer *ch, u_int trans, u_int src, u_int dest, int rotate) 446 { 447 u_char cmd[12]; 448 449 DPRINTK("move: 0x%x => 0x%x\n",src,dest); 450 if (0 == trans) 451 trans = ch->firsts[CHET_MT]; 452 memset(cmd,0,sizeof(cmd)); 453 cmd[0] = MOVE_MEDIUM; 454 cmd[1] = (ch->device->lun & 0x7) << 5; 455 cmd[2] = (trans >> 8) & 0xff; 456 cmd[3] = trans & 0xff; 457 cmd[4] = (src >> 8) & 0xff; 458 cmd[5] = src & 0xff; 459 cmd[6] = (dest >> 8) & 0xff; 460 cmd[7] = dest & 0xff; 461 cmd[10] = rotate ? 1 : 0; 462 return ch_do_scsi(ch, cmd, NULL,0, DMA_NONE); 463 } 464 465 static int 466 ch_exchange(scsi_changer *ch, u_int trans, u_int src, 467 u_int dest1, u_int dest2, int rotate1, int rotate2) 468 { 469 u_char cmd[12]; 470 471 DPRINTK("exchange: 0x%x => 0x%x => 0x%x\n", 472 src,dest1,dest2); 473 if (0 == trans) 474 trans = ch->firsts[CHET_MT]; 475 memset(cmd,0,sizeof(cmd)); 476 cmd[0] = EXCHANGE_MEDIUM; 477 cmd[1] = (ch->device->lun & 0x7) << 5; 478 cmd[2] = (trans >> 8) & 0xff; 479 cmd[3] = trans & 0xff; 480 cmd[4] = (src >> 8) & 0xff; 481 cmd[5] = src & 0xff; 482 cmd[6] = (dest1 >> 8) & 0xff; 483 cmd[7] = dest1 & 0xff; 484 cmd[8] = (dest2 >> 8) & 0xff; 485 cmd[9] = dest2 & 0xff; 486 cmd[10] = (rotate1 ? 1 : 0) | (rotate2 ? 2 : 0); 487 488 return ch_do_scsi(ch, cmd, NULL,0, DMA_NONE); 489 } 490 491 static void 492 ch_check_voltag(char *tag) 493 { 494 int i; 495 496 for (i = 0; i < 32; i++) { 497 /* restrict to ascii */ 498 if (tag[i] >= 0x7f || tag[i] < 0x20) 499 tag[i] = ' '; 500 /* don't allow search wildcards */ 501 if (tag[i] == '?' || 502 tag[i] == '*') 503 tag[i] = ' '; 504 } 505 } 506 507 static int 508 ch_set_voltag(scsi_changer *ch, u_int elem, 509 int alternate, int clear, u_char *tag) 510 { 511 u_char cmd[12]; 512 u_char *buffer; 513 int result; 514 515 buffer = kzalloc(512, GFP_KERNEL); 516 if (!buffer) 517 return -ENOMEM; 518 519 DPRINTK("%s %s voltag: 0x%x => \"%s\"\n", 520 clear ? "clear" : "set", 521 alternate ? "alternate" : "primary", 522 elem, tag); 523 memset(cmd,0,sizeof(cmd)); 524 cmd[0] = SEND_VOLUME_TAG; 525 cmd[1] = ((ch->device->lun & 0x7) << 5) | 526 ch_elem_to_typecode(ch,elem); 527 cmd[2] = (elem >> 8) & 0xff; 528 cmd[3] = elem & 0xff; 529 cmd[5] = clear 530 ? (alternate ? 0x0d : 0x0c) 531 : (alternate ? 0x0b : 0x0a); 532 533 cmd[9] = 255; 534 535 memcpy(buffer,tag,32); 536 ch_check_voltag(buffer); 537 538 result = ch_do_scsi(ch, cmd, buffer, 256, DMA_TO_DEVICE); 539 kfree(buffer); 540 return result; 541 } 542 543 static int ch_gstatus(scsi_changer *ch, int type, unsigned char __user *dest) 544 { 545 int retval = 0; 546 u_char data[16]; 547 unsigned int i; 548 549 mutex_lock(&ch->lock); 550 for (i = 0; i < ch->counts[type]; i++) { 551 if (0 != ch_read_element_status 552 (ch, ch->firsts[type]+i,data)) { 553 retval = -EIO; 554 break; 555 } 556 put_user(data[2], dest+i); 557 if (data[2] & CESTATUS_EXCEPT) 558 VPRINTK(KERN_INFO, "element 0x%x: asc=0x%x, ascq=0x%x\n", 559 ch->firsts[type]+i, 560 (int)data[4],(int)data[5]); 561 retval = ch_read_element_status 562 (ch, ch->firsts[type]+i,data); 563 if (0 != retval) 564 break; 565 } 566 mutex_unlock(&ch->lock); 567 return retval; 568 } 569 570 /* ------------------------------------------------------------------------ */ 571 572 static int 573 ch_release(struct inode *inode, struct file *file) 574 { 575 scsi_changer *ch = file->private_data; 576 577 scsi_device_put(ch->device); 578 file->private_data = NULL; 579 return 0; 580 } 581 582 static int 583 ch_open(struct inode *inode, struct file *file) 584 { 585 scsi_changer *ch; 586 int minor = iminor(inode); 587 588 mutex_lock(&ch_mutex); 589 spin_lock(&ch_index_lock); 590 ch = idr_find(&ch_index_idr, minor); 591 592 if (NULL == ch || scsi_device_get(ch->device)) { 593 spin_unlock(&ch_index_lock); 594 mutex_unlock(&ch_mutex); 595 return -ENXIO; 596 } 597 spin_unlock(&ch_index_lock); 598 599 file->private_data = ch; 600 mutex_unlock(&ch_mutex); 601 return 0; 602 } 603 604 static int 605 ch_checkrange(scsi_changer *ch, unsigned int type, unsigned int unit) 606 { 607 if (type >= CH_TYPES || unit >= ch->counts[type]) 608 return -1; 609 return 0; 610 } 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 switch (cmd) { 620 case CHIOGPARAMS: 621 { 622 struct changer_params params; 623 624 params.cp_curpicker = 0; 625 params.cp_npickers = ch->counts[CHET_MT]; 626 params.cp_nslots = ch->counts[CHET_ST]; 627 params.cp_nportals = ch->counts[CHET_IE]; 628 params.cp_ndrives = ch->counts[CHET_DT]; 629 630 if (copy_to_user(argp, ¶ms, sizeof(params))) 631 return -EFAULT; 632 return 0; 633 } 634 case CHIOGVPARAMS: 635 { 636 struct changer_vendor_params vparams; 637 638 memset(&vparams,0,sizeof(vparams)); 639 if (ch->counts[CHET_V1]) { 640 vparams.cvp_n1 = ch->counts[CHET_V1]; 641 strncpy(vparams.cvp_label1,vendor_labels[0],16); 642 } 643 if (ch->counts[CHET_V2]) { 644 vparams.cvp_n2 = ch->counts[CHET_V2]; 645 strncpy(vparams.cvp_label2,vendor_labels[1],16); 646 } 647 if (ch->counts[CHET_V3]) { 648 vparams.cvp_n3 = ch->counts[CHET_V3]; 649 strncpy(vparams.cvp_label3,vendor_labels[2],16); 650 } 651 if (ch->counts[CHET_V4]) { 652 vparams.cvp_n4 = ch->counts[CHET_V4]; 653 strncpy(vparams.cvp_label4,vendor_labels[3],16); 654 } 655 if (copy_to_user(argp, &vparams, sizeof(vparams))) 656 return -EFAULT; 657 return 0; 658 } 659 660 case CHIOPOSITION: 661 { 662 struct changer_position pos; 663 664 if (copy_from_user(&pos, argp, sizeof (pos))) 665 return -EFAULT; 666 667 if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) { 668 DPRINTK("CHIOPOSITION: invalid parameter\n"); 669 return -EBADSLT; 670 } 671 mutex_lock(&ch->lock); 672 retval = ch_position(ch,0, 673 ch->firsts[pos.cp_type] + pos.cp_unit, 674 pos.cp_flags & CP_INVERT); 675 mutex_unlock(&ch->lock); 676 return retval; 677 } 678 679 case CHIOMOVE: 680 { 681 struct changer_move mv; 682 683 if (copy_from_user(&mv, argp, sizeof (mv))) 684 return -EFAULT; 685 686 if (0 != ch_checkrange(ch, mv.cm_fromtype, mv.cm_fromunit) || 687 0 != ch_checkrange(ch, mv.cm_totype, mv.cm_tounit )) { 688 DPRINTK("CHIOMOVE: invalid parameter\n"); 689 return -EBADSLT; 690 } 691 692 mutex_lock(&ch->lock); 693 retval = ch_move(ch,0, 694 ch->firsts[mv.cm_fromtype] + mv.cm_fromunit, 695 ch->firsts[mv.cm_totype] + mv.cm_tounit, 696 mv.cm_flags & CM_INVERT); 697 mutex_unlock(&ch->lock); 698 return retval; 699 } 700 701 case CHIOEXCHANGE: 702 { 703 struct changer_exchange mv; 704 705 if (copy_from_user(&mv, argp, sizeof (mv))) 706 return -EFAULT; 707 708 if (0 != ch_checkrange(ch, mv.ce_srctype, mv.ce_srcunit ) || 709 0 != ch_checkrange(ch, mv.ce_fdsttype, mv.ce_fdstunit) || 710 0 != ch_checkrange(ch, mv.ce_sdsttype, mv.ce_sdstunit)) { 711 DPRINTK("CHIOEXCHANGE: invalid parameter\n"); 712 return -EBADSLT; 713 } 714 715 mutex_lock(&ch->lock); 716 retval = ch_exchange 717 (ch,0, 718 ch->firsts[mv.ce_srctype] + mv.ce_srcunit, 719 ch->firsts[mv.ce_fdsttype] + mv.ce_fdstunit, 720 ch->firsts[mv.ce_sdsttype] + mv.ce_sdstunit, 721 mv.ce_flags & CE_INVERT1, mv.ce_flags & CE_INVERT2); 722 mutex_unlock(&ch->lock); 723 return retval; 724 } 725 726 case CHIOGSTATUS: 727 { 728 struct changer_element_status ces; 729 730 if (copy_from_user(&ces, argp, sizeof (ces))) 731 return -EFAULT; 732 if (ces.ces_type < 0 || ces.ces_type >= CH_TYPES) 733 return -EINVAL; 734 735 return ch_gstatus(ch, ces.ces_type, ces.ces_data); 736 } 737 738 case CHIOGELEM: 739 { 740 struct changer_get_element cge; 741 u_char ch_cmd[12]; 742 u_char *buffer; 743 unsigned int elem; 744 int result,i; 745 746 if (copy_from_user(&cge, argp, sizeof (cge))) 747 return -EFAULT; 748 749 if (0 != ch_checkrange(ch, cge.cge_type, cge.cge_unit)) 750 return -EINVAL; 751 elem = ch->firsts[cge.cge_type] + cge.cge_unit; 752 753 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); 754 if (!buffer) 755 return -ENOMEM; 756 mutex_lock(&ch->lock); 757 758 voltag_retry: 759 memset(ch_cmd, 0, sizeof(ch_cmd)); 760 ch_cmd[0] = READ_ELEMENT_STATUS; 761 ch_cmd[1] = ((ch->device->lun & 0x7) << 5) | 762 (ch->voltags ? 0x10 : 0) | 763 ch_elem_to_typecode(ch,elem); 764 ch_cmd[2] = (elem >> 8) & 0xff; 765 ch_cmd[3] = elem & 0xff; 766 ch_cmd[5] = 1; 767 ch_cmd[9] = 255; 768 769 result = ch_do_scsi(ch, ch_cmd, buffer, 256, DMA_FROM_DEVICE); 770 if (!result) { 771 cge.cge_status = buffer[18]; 772 cge.cge_flags = 0; 773 if (buffer[18] & CESTATUS_EXCEPT) { 774 cge.cge_errno = EIO; 775 } 776 if (buffer[25] & 0x80) { 777 cge.cge_flags |= CGE_SRC; 778 if (buffer[25] & 0x40) 779 cge.cge_flags |= CGE_INVERT; 780 elem = (buffer[26]<<8) | buffer[27]; 781 for (i = 0; i < 4; i++) { 782 if (elem >= ch->firsts[i] && 783 elem < ch->firsts[i] + ch->counts[i]) { 784 cge.cge_srctype = i; 785 cge.cge_srcunit = elem-ch->firsts[i]; 786 } 787 } 788 } 789 if ((buffer[22] & 0x30) == 0x30) { 790 cge.cge_flags |= CGE_IDLUN; 791 cge.cge_id = buffer[23]; 792 cge.cge_lun = buffer[22] & 7; 793 } 794 if (buffer[9] & 0x80) { 795 cge.cge_flags |= CGE_PVOLTAG; 796 memcpy(cge.cge_pvoltag,buffer+28,36); 797 } 798 if (buffer[9] & 0x40) { 799 cge.cge_flags |= CGE_AVOLTAG; 800 memcpy(cge.cge_avoltag,buffer+64,36); 801 } 802 } else if (ch->voltags) { 803 ch->voltags = 0; 804 VPRINTK(KERN_INFO, "device has no volume tag support\n"); 805 goto voltag_retry; 806 } 807 kfree(buffer); 808 mutex_unlock(&ch->lock); 809 810 if (copy_to_user(argp, &cge, sizeof (cge))) 811 return -EFAULT; 812 return result; 813 } 814 815 case CHIOINITELEM: 816 { 817 mutex_lock(&ch->lock); 818 retval = ch_init_elem(ch); 819 mutex_unlock(&ch->lock); 820 return retval; 821 } 822 823 case CHIOSVOLTAG: 824 { 825 struct changer_set_voltag csv; 826 int elem; 827 828 if (copy_from_user(&csv, argp, sizeof(csv))) 829 return -EFAULT; 830 831 if (0 != ch_checkrange(ch, csv.csv_type, csv.csv_unit)) { 832 DPRINTK("CHIOSVOLTAG: invalid parameter\n"); 833 return -EBADSLT; 834 } 835 elem = ch->firsts[csv.csv_type] + csv.csv_unit; 836 mutex_lock(&ch->lock); 837 retval = ch_set_voltag(ch, elem, 838 csv.csv_flags & CSV_AVOLTAG, 839 csv.csv_flags & CSV_CLEARTAG, 840 csv.csv_voltag); 841 mutex_unlock(&ch->lock); 842 return retval; 843 } 844 845 default: 846 return scsi_ioctl(ch->device, cmd, argp); 847 848 } 849 } 850 851 #ifdef CONFIG_COMPAT 852 853 struct changer_element_status32 { 854 int ces_type; 855 compat_uptr_t ces_data; 856 }; 857 #define CHIOGSTATUS32 _IOW('c', 8,struct changer_element_status32) 858 859 static long ch_ioctl_compat(struct file * file, 860 unsigned int cmd, unsigned long arg) 861 { 862 scsi_changer *ch = file->private_data; 863 864 switch (cmd) { 865 case CHIOGPARAMS: 866 case CHIOGVPARAMS: 867 case CHIOPOSITION: 868 case CHIOMOVE: 869 case CHIOEXCHANGE: 870 case CHIOGELEM: 871 case CHIOINITELEM: 872 case CHIOSVOLTAG: 873 /* compatible */ 874 return ch_ioctl(file, cmd, arg); 875 case CHIOGSTATUS32: 876 { 877 struct changer_element_status32 ces32; 878 unsigned char __user *data; 879 880 if (copy_from_user(&ces32, (void __user *)arg, sizeof (ces32))) 881 return -EFAULT; 882 if (ces32.ces_type < 0 || ces32.ces_type >= CH_TYPES) 883 return -EINVAL; 884 885 data = compat_ptr(ces32.ces_data); 886 return ch_gstatus(ch, ces32.ces_type, data); 887 } 888 default: 889 // return scsi_ioctl_compat(ch->device, cmd, (void*)arg); 890 return -ENOIOCTLCMD; 891 892 } 893 } 894 #endif 895 896 /* ------------------------------------------------------------------------ */ 897 898 static int ch_probe(struct device *dev) 899 { 900 struct scsi_device *sd = to_scsi_device(dev); 901 struct device *class_dev; 902 int ret; 903 scsi_changer *ch; 904 905 if (sd->type != TYPE_MEDIUM_CHANGER) 906 return -ENODEV; 907 908 ch = kzalloc(sizeof(*ch), GFP_KERNEL); 909 if (NULL == ch) 910 return -ENOMEM; 911 912 idr_preload(GFP_KERNEL); 913 spin_lock(&ch_index_lock); 914 ret = idr_alloc(&ch_index_idr, ch, 0, CH_MAX_DEVS + 1, GFP_NOWAIT); 915 spin_unlock(&ch_index_lock); 916 idr_preload_end(); 917 918 if (ret < 0) { 919 if (ret == -ENOSPC) 920 ret = -ENODEV; 921 goto free_ch; 922 } 923 924 ch->minor = ret; 925 sprintf(ch->name,"ch%d",ch->minor); 926 927 class_dev = device_create(ch_sysfs_class, dev, 928 MKDEV(SCSI_CHANGER_MAJOR, ch->minor), ch, 929 "s%s", ch->name); 930 if (IS_ERR(class_dev)) { 931 sdev_printk(KERN_WARNING, sd, "ch%d: device_create failed\n", 932 ch->minor); 933 ret = PTR_ERR(class_dev); 934 goto remove_idr; 935 } 936 937 mutex_init(&ch->lock); 938 ch->device = sd; 939 ch_readconfig(ch); 940 if (init) 941 ch_init_elem(ch); 942 943 dev_set_drvdata(dev, ch); 944 sdev_printk(KERN_INFO, sd, "Attached scsi changer %s\n", ch->name); 945 946 return 0; 947 remove_idr: 948 idr_remove(&ch_index_idr, ch->minor); 949 free_ch: 950 kfree(ch); 951 return ret; 952 } 953 954 static int ch_remove(struct device *dev) 955 { 956 scsi_changer *ch = dev_get_drvdata(dev); 957 958 spin_lock(&ch_index_lock); 959 idr_remove(&ch_index_idr, ch->minor); 960 spin_unlock(&ch_index_lock); 961 962 device_destroy(ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR,ch->minor)); 963 kfree(ch->dt); 964 kfree(ch); 965 return 0; 966 } 967 968 static struct scsi_driver ch_template = { 969 .owner = THIS_MODULE, 970 .gendrv = { 971 .name = "ch", 972 .probe = ch_probe, 973 .remove = ch_remove, 974 }, 975 }; 976 977 static const struct file_operations changer_fops = { 978 .owner = THIS_MODULE, 979 .open = ch_open, 980 .release = ch_release, 981 .unlocked_ioctl = ch_ioctl, 982 #ifdef CONFIG_COMPAT 983 .compat_ioctl = ch_ioctl_compat, 984 #endif 985 .llseek = noop_llseek, 986 }; 987 988 static int __init init_ch_module(void) 989 { 990 int rc; 991 992 printk(KERN_INFO "SCSI Media Changer driver v" VERSION " \n"); 993 ch_sysfs_class = class_create(THIS_MODULE, "scsi_changer"); 994 if (IS_ERR(ch_sysfs_class)) { 995 rc = PTR_ERR(ch_sysfs_class); 996 return rc; 997 } 998 rc = register_chrdev(SCSI_CHANGER_MAJOR,"ch",&changer_fops); 999 if (rc < 0) { 1000 printk("Unable to get major %d for SCSI-Changer\n", 1001 SCSI_CHANGER_MAJOR); 1002 goto fail1; 1003 } 1004 rc = scsi_register_driver(&ch_template.gendrv); 1005 if (rc < 0) 1006 goto fail2; 1007 return 0; 1008 1009 fail2: 1010 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch"); 1011 fail1: 1012 class_destroy(ch_sysfs_class); 1013 return rc; 1014 } 1015 1016 static void __exit exit_ch_module(void) 1017 { 1018 scsi_unregister_driver(&ch_template.gendrv); 1019 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch"); 1020 class_destroy(ch_sysfs_class); 1021 idr_destroy(&ch_index_idr); 1022 } 1023 1024 module_init(init_ch_module); 1025 module_exit(exit_ch_module); 1026 1027 /* 1028 * Local variables: 1029 * c-basic-offset: 8 1030 * End: 1031 */ 1032