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 DPRINTK(fmt, arg...) \ 88 do { \ 89 if (debug) \ 90 printk(KERN_DEBUG "%s: " fmt, ch->name, ##arg); \ 91 } while (0) 92 #define VPRINTK(level, fmt, arg...) \ 93 do { \ 94 if (verbose) \ 95 printk(level "%s: " fmt, ch->name, ##arg); \ 96 } while (0) 97 98 /* ------------------------------------------------------------------- */ 99 100 #define MAX_RETRIES 1 101 102 static struct class * ch_sysfs_class; 103 104 typedef struct { 105 struct list_head list; 106 int minor; 107 char name[8]; 108 struct scsi_device *device; 109 struct scsi_device **dt; /* ptrs to data transfer elements */ 110 u_int firsts[CH_TYPES]; 111 u_int counts[CH_TYPES]; 112 u_int unit_attention; 113 u_int voltags; 114 struct mutex lock; 115 } scsi_changer; 116 117 static DEFINE_IDR(ch_index_idr); 118 static DEFINE_SPINLOCK(ch_index_lock); 119 120 static const struct { 121 unsigned char sense; 122 unsigned char asc; 123 unsigned char ascq; 124 int errno; 125 } ch_err[] = { 126 /* Just filled in what looks right. Hav'nt checked any standard paper for 127 these errno assignments, so they may be wrong... */ 128 { 129 .sense = ILLEGAL_REQUEST, 130 .asc = 0x21, 131 .ascq = 0x01, 132 .errno = EBADSLT, /* Invalid element address */ 133 },{ 134 .sense = ILLEGAL_REQUEST, 135 .asc = 0x28, 136 .ascq = 0x01, 137 .errno = EBADE, /* Import or export element accessed */ 138 },{ 139 .sense = ILLEGAL_REQUEST, 140 .asc = 0x3B, 141 .ascq = 0x0D, 142 .errno = EXFULL, /* Medium destination element full */ 143 },{ 144 .sense = ILLEGAL_REQUEST, 145 .asc = 0x3B, 146 .ascq = 0x0E, 147 .errno = EBADE, /* Medium source element empty */ 148 },{ 149 .sense = ILLEGAL_REQUEST, 150 .asc = 0x20, 151 .ascq = 0x00, 152 .errno = EBADRQC, /* Invalid command operation code */ 153 },{ 154 /* end of list */ 155 } 156 }; 157 158 /* ------------------------------------------------------------------- */ 159 160 static int ch_find_errno(struct scsi_sense_hdr *sshdr) 161 { 162 int i,errno = 0; 163 164 /* Check to see if additional sense information is available */ 165 if (scsi_sense_valid(sshdr) && 166 sshdr->asc != 0) { 167 for (i = 0; ch_err[i].errno != 0; i++) { 168 if (ch_err[i].sense == sshdr->sense_key && 169 ch_err[i].asc == sshdr->asc && 170 ch_err[i].ascq == sshdr->ascq) { 171 errno = -ch_err[i].errno; 172 break; 173 } 174 } 175 } 176 if (errno == 0) 177 errno = -EIO; 178 return errno; 179 } 180 181 static int 182 ch_do_scsi(scsi_changer *ch, unsigned char *cmd, 183 void *buffer, unsigned buflength, 184 enum dma_data_direction direction) 185 { 186 int errno, retries = 0, timeout, result; 187 struct scsi_sense_hdr sshdr; 188 189 timeout = (cmd[0] == INITIALIZE_ELEMENT_STATUS) 190 ? timeout_init : timeout_move; 191 192 retry: 193 errno = 0; 194 if (debug) { 195 DPRINTK("command: "); 196 __scsi_print_command(cmd); 197 } 198 199 result = scsi_execute_req(ch->device, cmd, direction, buffer, 200 buflength, &sshdr, timeout * HZ, 201 MAX_RETRIES, NULL); 202 203 DPRINTK("result: 0x%x\n",result); 204 if (driver_byte(result) & DRIVER_SENSE) { 205 if (debug) 206 scsi_print_sense_hdr(ch->name, &sshdr); 207 errno = ch_find_errno(&sshdr); 208 209 switch(sshdr.sense_key) { 210 case UNIT_ATTENTION: 211 ch->unit_attention = 1; 212 if (retries++ < 3) 213 goto retry; 214 break; 215 } 216 } 217 return errno; 218 } 219 220 /* ------------------------------------------------------------------------ */ 221 222 static int 223 ch_elem_to_typecode(scsi_changer *ch, u_int elem) 224 { 225 int i; 226 227 for (i = 0; i < CH_TYPES; i++) { 228 if (elem >= ch->firsts[i] && 229 elem < ch->firsts[i] + 230 ch->counts[i]) 231 return i+1; 232 } 233 return 0; 234 } 235 236 static int 237 ch_read_element_status(scsi_changer *ch, u_int elem, char *data) 238 { 239 u_char cmd[12]; 240 u_char *buffer; 241 int result; 242 243 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); 244 if(!buffer) 245 return -ENOMEM; 246 247 retry: 248 memset(cmd,0,sizeof(cmd)); 249 cmd[0] = READ_ELEMENT_STATUS; 250 cmd[1] = (ch->device->lun << 5) | 251 (ch->voltags ? 0x10 : 0) | 252 ch_elem_to_typecode(ch,elem); 253 cmd[2] = (elem >> 8) & 0xff; 254 cmd[3] = elem & 0xff; 255 cmd[5] = 1; 256 cmd[9] = 255; 257 if (0 == (result = ch_do_scsi(ch, cmd, 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 << 5; 287 err = ch_do_scsi(ch, cmd, 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 << 5; 307 cmd[2] = 0x1d; 308 cmd[4] = 255; 309 result = ch_do_scsi(ch, cmd, buffer, 255, DMA_FROM_DEVICE); 310 if (0 != result) { 311 cmd[1] |= (1<<3); 312 result = ch_do_scsi(ch, cmd, 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 assigment 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 << 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, 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 << 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, 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 << 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, 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 << 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, 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 int 569 ch_release(struct inode *inode, struct file *file) 570 { 571 scsi_changer *ch = file->private_data; 572 573 scsi_device_put(ch->device); 574 file->private_data = NULL; 575 return 0; 576 } 577 578 static int 579 ch_open(struct inode *inode, struct file *file) 580 { 581 scsi_changer *ch; 582 int minor = iminor(inode); 583 584 mutex_lock(&ch_mutex); 585 spin_lock(&ch_index_lock); 586 ch = idr_find(&ch_index_idr, minor); 587 588 if (NULL == ch || scsi_device_get(ch->device)) { 589 spin_unlock(&ch_index_lock); 590 mutex_unlock(&ch_mutex); 591 return -ENXIO; 592 } 593 spin_unlock(&ch_index_lock); 594 595 file->private_data = ch; 596 mutex_unlock(&ch_mutex); 597 return 0; 598 } 599 600 static int 601 ch_checkrange(scsi_changer *ch, unsigned int type, unsigned int unit) 602 { 603 if (type >= CH_TYPES || unit >= ch->counts[type]) 604 return -1; 605 return 0; 606 } 607 608 static long ch_ioctl(struct file *file, 609 unsigned int cmd, unsigned long arg) 610 { 611 scsi_changer *ch = file->private_data; 612 int retval; 613 void __user *argp = (void __user *)arg; 614 615 switch (cmd) { 616 case CHIOGPARAMS: 617 { 618 struct changer_params params; 619 620 params.cp_curpicker = 0; 621 params.cp_npickers = ch->counts[CHET_MT]; 622 params.cp_nslots = ch->counts[CHET_ST]; 623 params.cp_nportals = ch->counts[CHET_IE]; 624 params.cp_ndrives = ch->counts[CHET_DT]; 625 626 if (copy_to_user(argp, ¶ms, sizeof(params))) 627 return -EFAULT; 628 return 0; 629 } 630 case CHIOGVPARAMS: 631 { 632 struct changer_vendor_params vparams; 633 634 memset(&vparams,0,sizeof(vparams)); 635 if (ch->counts[CHET_V1]) { 636 vparams.cvp_n1 = ch->counts[CHET_V1]; 637 strncpy(vparams.cvp_label1,vendor_labels[0],16); 638 } 639 if (ch->counts[CHET_V2]) { 640 vparams.cvp_n2 = ch->counts[CHET_V2]; 641 strncpy(vparams.cvp_label2,vendor_labels[1],16); 642 } 643 if (ch->counts[CHET_V3]) { 644 vparams.cvp_n3 = ch->counts[CHET_V3]; 645 strncpy(vparams.cvp_label3,vendor_labels[2],16); 646 } 647 if (ch->counts[CHET_V4]) { 648 vparams.cvp_n4 = ch->counts[CHET_V4]; 649 strncpy(vparams.cvp_label4,vendor_labels[3],16); 650 } 651 if (copy_to_user(argp, &vparams, sizeof(vparams))) 652 return -EFAULT; 653 return 0; 654 } 655 656 case CHIOPOSITION: 657 { 658 struct changer_position pos; 659 660 if (copy_from_user(&pos, argp, sizeof (pos))) 661 return -EFAULT; 662 663 if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) { 664 DPRINTK("CHIOPOSITION: invalid parameter\n"); 665 return -EBADSLT; 666 } 667 mutex_lock(&ch->lock); 668 retval = ch_position(ch,0, 669 ch->firsts[pos.cp_type] + pos.cp_unit, 670 pos.cp_flags & CP_INVERT); 671 mutex_unlock(&ch->lock); 672 return retval; 673 } 674 675 case CHIOMOVE: 676 { 677 struct changer_move mv; 678 679 if (copy_from_user(&mv, argp, sizeof (mv))) 680 return -EFAULT; 681 682 if (0 != ch_checkrange(ch, mv.cm_fromtype, mv.cm_fromunit) || 683 0 != ch_checkrange(ch, mv.cm_totype, mv.cm_tounit )) { 684 DPRINTK("CHIOMOVE: invalid parameter\n"); 685 return -EBADSLT; 686 } 687 688 mutex_lock(&ch->lock); 689 retval = ch_move(ch,0, 690 ch->firsts[mv.cm_fromtype] + mv.cm_fromunit, 691 ch->firsts[mv.cm_totype] + mv.cm_tounit, 692 mv.cm_flags & CM_INVERT); 693 mutex_unlock(&ch->lock); 694 return retval; 695 } 696 697 case CHIOEXCHANGE: 698 { 699 struct changer_exchange mv; 700 701 if (copy_from_user(&mv, argp, sizeof (mv))) 702 return -EFAULT; 703 704 if (0 != ch_checkrange(ch, mv.ce_srctype, mv.ce_srcunit ) || 705 0 != ch_checkrange(ch, mv.ce_fdsttype, mv.ce_fdstunit) || 706 0 != ch_checkrange(ch, mv.ce_sdsttype, mv.ce_sdstunit)) { 707 DPRINTK("CHIOEXCHANGE: invalid parameter\n"); 708 return -EBADSLT; 709 } 710 711 mutex_lock(&ch->lock); 712 retval = ch_exchange 713 (ch,0, 714 ch->firsts[mv.ce_srctype] + mv.ce_srcunit, 715 ch->firsts[mv.ce_fdsttype] + mv.ce_fdstunit, 716 ch->firsts[mv.ce_sdsttype] + mv.ce_sdstunit, 717 mv.ce_flags & CE_INVERT1, mv.ce_flags & CE_INVERT2); 718 mutex_unlock(&ch->lock); 719 return retval; 720 } 721 722 case CHIOGSTATUS: 723 { 724 struct changer_element_status ces; 725 726 if (copy_from_user(&ces, argp, sizeof (ces))) 727 return -EFAULT; 728 if (ces.ces_type < 0 || ces.ces_type >= CH_TYPES) 729 return -EINVAL; 730 731 return ch_gstatus(ch, ces.ces_type, ces.ces_data); 732 } 733 734 case CHIOGELEM: 735 { 736 struct changer_get_element cge; 737 u_char ch_cmd[12]; 738 u_char *buffer; 739 unsigned int elem; 740 int result,i; 741 742 if (copy_from_user(&cge, argp, sizeof (cge))) 743 return -EFAULT; 744 745 if (0 != ch_checkrange(ch, cge.cge_type, cge.cge_unit)) 746 return -EINVAL; 747 elem = ch->firsts[cge.cge_type] + cge.cge_unit; 748 749 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); 750 if (!buffer) 751 return -ENOMEM; 752 mutex_lock(&ch->lock); 753 754 voltag_retry: 755 memset(ch_cmd, 0, sizeof(ch_cmd)); 756 ch_cmd[0] = READ_ELEMENT_STATUS; 757 ch_cmd[1] = (ch->device->lun << 5) | 758 (ch->voltags ? 0x10 : 0) | 759 ch_elem_to_typecode(ch,elem); 760 ch_cmd[2] = (elem >> 8) & 0xff; 761 ch_cmd[3] = elem & 0xff; 762 ch_cmd[5] = 1; 763 ch_cmd[9] = 255; 764 765 result = ch_do_scsi(ch, ch_cmd, buffer, 256, DMA_FROM_DEVICE); 766 if (!result) { 767 cge.cge_status = buffer[18]; 768 cge.cge_flags = 0; 769 if (buffer[18] & CESTATUS_EXCEPT) { 770 cge.cge_errno = EIO; 771 } 772 if (buffer[25] & 0x80) { 773 cge.cge_flags |= CGE_SRC; 774 if (buffer[25] & 0x40) 775 cge.cge_flags |= CGE_INVERT; 776 elem = (buffer[26]<<8) | buffer[27]; 777 for (i = 0; i < 4; i++) { 778 if (elem >= ch->firsts[i] && 779 elem < ch->firsts[i] + ch->counts[i]) { 780 cge.cge_srctype = i; 781 cge.cge_srcunit = elem-ch->firsts[i]; 782 } 783 } 784 } 785 if ((buffer[22] & 0x30) == 0x30) { 786 cge.cge_flags |= CGE_IDLUN; 787 cge.cge_id = buffer[23]; 788 cge.cge_lun = buffer[22] & 7; 789 } 790 if (buffer[9] & 0x80) { 791 cge.cge_flags |= CGE_PVOLTAG; 792 memcpy(cge.cge_pvoltag,buffer+28,36); 793 } 794 if (buffer[9] & 0x40) { 795 cge.cge_flags |= CGE_AVOLTAG; 796 memcpy(cge.cge_avoltag,buffer+64,36); 797 } 798 } else if (ch->voltags) { 799 ch->voltags = 0; 800 VPRINTK(KERN_INFO, "device has no volume tag support\n"); 801 goto voltag_retry; 802 } 803 kfree(buffer); 804 mutex_unlock(&ch->lock); 805 806 if (copy_to_user(argp, &cge, sizeof (cge))) 807 return -EFAULT; 808 return result; 809 } 810 811 case CHIOINITELEM: 812 { 813 mutex_lock(&ch->lock); 814 retval = ch_init_elem(ch); 815 mutex_unlock(&ch->lock); 816 return retval; 817 } 818 819 case CHIOSVOLTAG: 820 { 821 struct changer_set_voltag csv; 822 int elem; 823 824 if (copy_from_user(&csv, argp, sizeof(csv))) 825 return -EFAULT; 826 827 if (0 != ch_checkrange(ch, csv.csv_type, csv.csv_unit)) { 828 DPRINTK("CHIOSVOLTAG: invalid parameter\n"); 829 return -EBADSLT; 830 } 831 elem = ch->firsts[csv.csv_type] + csv.csv_unit; 832 mutex_lock(&ch->lock); 833 retval = ch_set_voltag(ch, elem, 834 csv.csv_flags & CSV_AVOLTAG, 835 csv.csv_flags & CSV_CLEARTAG, 836 csv.csv_voltag); 837 mutex_unlock(&ch->lock); 838 return retval; 839 } 840 841 default: 842 return scsi_ioctl(ch->device, cmd, argp); 843 844 } 845 } 846 847 #ifdef CONFIG_COMPAT 848 849 struct changer_element_status32 { 850 int ces_type; 851 compat_uptr_t ces_data; 852 }; 853 #define CHIOGSTATUS32 _IOW('c', 8,struct changer_element_status32) 854 855 static long ch_ioctl_compat(struct file * file, 856 unsigned int cmd, unsigned long arg) 857 { 858 scsi_changer *ch = file->private_data; 859 860 switch (cmd) { 861 case CHIOGPARAMS: 862 case CHIOGVPARAMS: 863 case CHIOPOSITION: 864 case CHIOMOVE: 865 case CHIOEXCHANGE: 866 case CHIOGELEM: 867 case CHIOINITELEM: 868 case CHIOSVOLTAG: 869 /* compatible */ 870 return ch_ioctl(file, cmd, arg); 871 case CHIOGSTATUS32: 872 { 873 struct changer_element_status32 ces32; 874 unsigned char __user *data; 875 876 if (copy_from_user(&ces32, (void __user *)arg, sizeof (ces32))) 877 return -EFAULT; 878 if (ces32.ces_type < 0 || ces32.ces_type >= CH_TYPES) 879 return -EINVAL; 880 881 data = compat_ptr(ces32.ces_data); 882 return ch_gstatus(ch, ces32.ces_type, data); 883 } 884 default: 885 // return scsi_ioctl_compat(ch->device, cmd, (void*)arg); 886 return -ENOIOCTLCMD; 887 888 } 889 } 890 #endif 891 892 /* ------------------------------------------------------------------------ */ 893 894 static int ch_probe(struct device *dev) 895 { 896 struct scsi_device *sd = to_scsi_device(dev); 897 struct device *class_dev; 898 int ret; 899 scsi_changer *ch; 900 901 if (sd->type != TYPE_MEDIUM_CHANGER) 902 return -ENODEV; 903 904 ch = kzalloc(sizeof(*ch), GFP_KERNEL); 905 if (NULL == ch) 906 return -ENOMEM; 907 908 idr_preload(GFP_KERNEL); 909 spin_lock(&ch_index_lock); 910 ret = idr_alloc(&ch_index_idr, ch, 0, CH_MAX_DEVS + 1, GFP_NOWAIT); 911 spin_unlock(&ch_index_lock); 912 idr_preload_end(); 913 914 if (ret < 0) { 915 if (ret == -ENOSPC) 916 ret = -ENODEV; 917 goto free_ch; 918 } 919 920 ch->minor = ret; 921 sprintf(ch->name,"ch%d",ch->minor); 922 923 class_dev = device_create(ch_sysfs_class, dev, 924 MKDEV(SCSI_CHANGER_MAJOR, ch->minor), ch, 925 "s%s", ch->name); 926 if (IS_ERR(class_dev)) { 927 printk(KERN_WARNING "ch%d: device_create failed\n", 928 ch->minor); 929 ret = PTR_ERR(class_dev); 930 goto remove_idr; 931 } 932 933 mutex_init(&ch->lock); 934 ch->device = sd; 935 ch_readconfig(ch); 936 if (init) 937 ch_init_elem(ch); 938 939 dev_set_drvdata(dev, ch); 940 sdev_printk(KERN_INFO, sd, "Attached scsi changer %s\n", ch->name); 941 942 return 0; 943 remove_idr: 944 idr_remove(&ch_index_idr, ch->minor); 945 free_ch: 946 kfree(ch); 947 return ret; 948 } 949 950 static int ch_remove(struct device *dev) 951 { 952 scsi_changer *ch = dev_get_drvdata(dev); 953 954 spin_lock(&ch_index_lock); 955 idr_remove(&ch_index_idr, ch->minor); 956 spin_unlock(&ch_index_lock); 957 958 device_destroy(ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR,ch->minor)); 959 kfree(ch->dt); 960 kfree(ch); 961 return 0; 962 } 963 964 static struct scsi_driver ch_template = { 965 .owner = THIS_MODULE, 966 .gendrv = { 967 .name = "ch", 968 .probe = ch_probe, 969 .remove = ch_remove, 970 }, 971 }; 972 973 static const struct file_operations changer_fops = { 974 .owner = THIS_MODULE, 975 .open = ch_open, 976 .release = ch_release, 977 .unlocked_ioctl = ch_ioctl, 978 #ifdef CONFIG_COMPAT 979 .compat_ioctl = ch_ioctl_compat, 980 #endif 981 .llseek = noop_llseek, 982 }; 983 984 static int __init init_ch_module(void) 985 { 986 int rc; 987 988 printk(KERN_INFO "SCSI Media Changer driver v" VERSION " \n"); 989 ch_sysfs_class = class_create(THIS_MODULE, "scsi_changer"); 990 if (IS_ERR(ch_sysfs_class)) { 991 rc = PTR_ERR(ch_sysfs_class); 992 return rc; 993 } 994 rc = register_chrdev(SCSI_CHANGER_MAJOR,"ch",&changer_fops); 995 if (rc < 0) { 996 printk("Unable to get major %d for SCSI-Changer\n", 997 SCSI_CHANGER_MAJOR); 998 goto fail1; 999 } 1000 rc = scsi_register_driver(&ch_template.gendrv); 1001 if (rc < 0) 1002 goto fail2; 1003 return 0; 1004 1005 fail2: 1006 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch"); 1007 fail1: 1008 class_destroy(ch_sysfs_class); 1009 return rc; 1010 } 1011 1012 static void __exit exit_ch_module(void) 1013 { 1014 scsi_unregister_driver(&ch_template.gendrv); 1015 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch"); 1016 class_destroy(ch_sysfs_class); 1017 idr_destroy(&ch_index_idr); 1018 } 1019 1020 module_init(init_ch_module); 1021 module_exit(exit_ch_module); 1022 1023 /* 1024 * Local variables: 1025 * c-basic-offset: 8 1026 * End: 1027 */ 1028