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/smp_lock.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 int init = 1; 47 module_param(init, int, 0444); 48 MODULE_PARM_DESC(init, \ 49 "initialize element status on driver load (default: on)"); 50 51 static int timeout_move = 300; 52 module_param(timeout_move, int, 0644); 53 MODULE_PARM_DESC(timeout_move,"timeout for move commands " 54 "(default: 300 seconds)"); 55 56 static int timeout_init = 3600; 57 module_param(timeout_init, int, 0644); 58 MODULE_PARM_DESC(timeout_init,"timeout for INITIALIZE ELEMENT STATUS " 59 "(default: 3600 seconds)"); 60 61 static int verbose = 1; 62 module_param(verbose, int, 0644); 63 MODULE_PARM_DESC(verbose,"be verbose (default: on)"); 64 65 static int debug = 0; 66 module_param(debug, int, 0644); 67 MODULE_PARM_DESC(debug,"enable/disable debug messages, also prints more " 68 "detailed sense codes on scsi errors (default: off)"); 69 70 static int dt_id[CH_DT_MAX] = { [ 0 ... (CH_DT_MAX-1) ] = -1 }; 71 static int dt_lun[CH_DT_MAX]; 72 module_param_array(dt_id, int, NULL, 0444); 73 module_param_array(dt_lun, int, NULL, 0444); 74 75 /* tell the driver about vendor-specific slots */ 76 static int vendor_firsts[CH_TYPES-4]; 77 static int vendor_counts[CH_TYPES-4]; 78 module_param_array(vendor_firsts, int, NULL, 0444); 79 module_param_array(vendor_counts, int, NULL, 0444); 80 81 static const char * vendor_labels[CH_TYPES-4] = { 82 "v0", "v1", "v2", "v3" 83 }; 84 // module_param_string_array(vendor_labels, NULL, 0444); 85 86 #define dprintk(fmt, arg...) if (debug) \ 87 printk(KERN_DEBUG "%s: " fmt, ch->name , ## arg) 88 #define vprintk(fmt, arg...) if (verbose) \ 89 printk(KERN_INFO "%s: " fmt, ch->name , ## arg) 90 91 /* ------------------------------------------------------------------- */ 92 93 #define MAX_RETRIES 1 94 95 static struct class * ch_sysfs_class; 96 97 typedef struct { 98 struct list_head list; 99 int minor; 100 char name[8]; 101 struct scsi_device *device; 102 struct scsi_device **dt; /* ptrs to data transfer elements */ 103 u_int firsts[CH_TYPES]; 104 u_int counts[CH_TYPES]; 105 u_int unit_attention; 106 u_int voltags; 107 struct mutex lock; 108 } scsi_changer; 109 110 static DEFINE_IDR(ch_index_idr); 111 static DEFINE_SPINLOCK(ch_index_lock); 112 113 static const struct { 114 unsigned char sense; 115 unsigned char asc; 116 unsigned char ascq; 117 int errno; 118 } ch_err[] = { 119 /* Just filled in what looks right. Hav'nt checked any standard paper for 120 these errno assignments, so they may be wrong... */ 121 { 122 .sense = ILLEGAL_REQUEST, 123 .asc = 0x21, 124 .ascq = 0x01, 125 .errno = EBADSLT, /* Invalid element address */ 126 },{ 127 .sense = ILLEGAL_REQUEST, 128 .asc = 0x28, 129 .ascq = 0x01, 130 .errno = EBADE, /* Import or export element accessed */ 131 },{ 132 .sense = ILLEGAL_REQUEST, 133 .asc = 0x3B, 134 .ascq = 0x0D, 135 .errno = EXFULL, /* Medium destination element full */ 136 },{ 137 .sense = ILLEGAL_REQUEST, 138 .asc = 0x3B, 139 .ascq = 0x0E, 140 .errno = EBADE, /* Medium source element empty */ 141 },{ 142 .sense = ILLEGAL_REQUEST, 143 .asc = 0x20, 144 .ascq = 0x00, 145 .errno = EBADRQC, /* Invalid command operation code */ 146 },{ 147 /* end of list */ 148 } 149 }; 150 151 /* ------------------------------------------------------------------- */ 152 153 static int ch_find_errno(struct scsi_sense_hdr *sshdr) 154 { 155 int i,errno = 0; 156 157 /* Check to see if additional sense information is available */ 158 if (scsi_sense_valid(sshdr) && 159 sshdr->asc != 0) { 160 for (i = 0; ch_err[i].errno != 0; i++) { 161 if (ch_err[i].sense == sshdr->sense_key && 162 ch_err[i].asc == sshdr->asc && 163 ch_err[i].ascq == sshdr->ascq) { 164 errno = -ch_err[i].errno; 165 break; 166 } 167 } 168 } 169 if (errno == 0) 170 errno = -EIO; 171 return errno; 172 } 173 174 static int 175 ch_do_scsi(scsi_changer *ch, unsigned char *cmd, 176 void *buffer, unsigned buflength, 177 enum dma_data_direction direction) 178 { 179 int errno, retries = 0, timeout, result; 180 struct scsi_sense_hdr sshdr; 181 182 timeout = (cmd[0] == INITIALIZE_ELEMENT_STATUS) 183 ? timeout_init : timeout_move; 184 185 retry: 186 errno = 0; 187 if (debug) { 188 dprintk("command: "); 189 __scsi_print_command(cmd); 190 } 191 192 result = scsi_execute_req(ch->device, cmd, direction, buffer, 193 buflength, &sshdr, timeout * HZ, 194 MAX_RETRIES, NULL); 195 196 dprintk("result: 0x%x\n",result); 197 if (driver_byte(result) & DRIVER_SENSE) { 198 if (debug) 199 scsi_print_sense_hdr(ch->name, &sshdr); 200 errno = ch_find_errno(&sshdr); 201 202 switch(sshdr.sense_key) { 203 case UNIT_ATTENTION: 204 ch->unit_attention = 1; 205 if (retries++ < 3) 206 goto retry; 207 break; 208 } 209 } 210 return errno; 211 } 212 213 /* ------------------------------------------------------------------------ */ 214 215 static int 216 ch_elem_to_typecode(scsi_changer *ch, u_int elem) 217 { 218 int i; 219 220 for (i = 0; i < CH_TYPES; i++) { 221 if (elem >= ch->firsts[i] && 222 elem < ch->firsts[i] + 223 ch->counts[i]) 224 return i+1; 225 } 226 return 0; 227 } 228 229 static int 230 ch_read_element_status(scsi_changer *ch, u_int elem, char *data) 231 { 232 u_char cmd[12]; 233 u_char *buffer; 234 int result; 235 236 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); 237 if(!buffer) 238 return -ENOMEM; 239 240 retry: 241 memset(cmd,0,sizeof(cmd)); 242 cmd[0] = READ_ELEMENT_STATUS; 243 cmd[1] = (ch->device->lun << 5) | 244 (ch->voltags ? 0x10 : 0) | 245 ch_elem_to_typecode(ch,elem); 246 cmd[2] = (elem >> 8) & 0xff; 247 cmd[3] = elem & 0xff; 248 cmd[5] = 1; 249 cmd[9] = 255; 250 if (0 == (result = ch_do_scsi(ch, cmd, buffer, 256, DMA_FROM_DEVICE))) { 251 if (((buffer[16] << 8) | buffer[17]) != elem) { 252 dprintk("asked for element 0x%02x, got 0x%02x\n", 253 elem,(buffer[16] << 8) | buffer[17]); 254 kfree(buffer); 255 return -EIO; 256 } 257 memcpy(data,buffer+16,16); 258 } else { 259 if (ch->voltags) { 260 ch->voltags = 0; 261 vprintk("device has no volume tag support\n"); 262 goto retry; 263 } 264 dprintk("READ ELEMENT STATUS for element 0x%x failed\n",elem); 265 } 266 kfree(buffer); 267 return result; 268 } 269 270 static int 271 ch_init_elem(scsi_changer *ch) 272 { 273 int err; 274 u_char cmd[6]; 275 276 vprintk("INITIALIZE ELEMENT STATUS, may take some time ...\n"); 277 memset(cmd,0,sizeof(cmd)); 278 cmd[0] = INITIALIZE_ELEMENT_STATUS; 279 cmd[1] = ch->device->lun << 5; 280 err = ch_do_scsi(ch, cmd, NULL, 0, DMA_NONE); 281 vprintk("... finished\n"); 282 return err; 283 } 284 285 static int 286 ch_readconfig(scsi_changer *ch) 287 { 288 u_char cmd[10], data[16]; 289 u_char *buffer; 290 int result,id,lun,i; 291 u_int elem; 292 293 buffer = kzalloc(512, GFP_KERNEL | GFP_DMA); 294 if (!buffer) 295 return -ENOMEM; 296 297 memset(cmd,0,sizeof(cmd)); 298 cmd[0] = MODE_SENSE; 299 cmd[1] = ch->device->lun << 5; 300 cmd[2] = 0x1d; 301 cmd[4] = 255; 302 result = ch_do_scsi(ch, cmd, buffer, 255, DMA_FROM_DEVICE); 303 if (0 != result) { 304 cmd[1] |= (1<<3); 305 result = ch_do_scsi(ch, cmd, buffer, 255, DMA_FROM_DEVICE); 306 } 307 if (0 == result) { 308 ch->firsts[CHET_MT] = 309 (buffer[buffer[3]+ 6] << 8) | buffer[buffer[3]+ 7]; 310 ch->counts[CHET_MT] = 311 (buffer[buffer[3]+ 8] << 8) | buffer[buffer[3]+ 9]; 312 ch->firsts[CHET_ST] = 313 (buffer[buffer[3]+10] << 8) | buffer[buffer[3]+11]; 314 ch->counts[CHET_ST] = 315 (buffer[buffer[3]+12] << 8) | buffer[buffer[3]+13]; 316 ch->firsts[CHET_IE] = 317 (buffer[buffer[3]+14] << 8) | buffer[buffer[3]+15]; 318 ch->counts[CHET_IE] = 319 (buffer[buffer[3]+16] << 8) | buffer[buffer[3]+17]; 320 ch->firsts[CHET_DT] = 321 (buffer[buffer[3]+18] << 8) | buffer[buffer[3]+19]; 322 ch->counts[CHET_DT] = 323 (buffer[buffer[3]+20] << 8) | buffer[buffer[3]+21]; 324 vprintk("type #1 (mt): 0x%x+%d [medium transport]\n", 325 ch->firsts[CHET_MT], 326 ch->counts[CHET_MT]); 327 vprintk("type #2 (st): 0x%x+%d [storage]\n", 328 ch->firsts[CHET_ST], 329 ch->counts[CHET_ST]); 330 vprintk("type #3 (ie): 0x%x+%d [import/export]\n", 331 ch->firsts[CHET_IE], 332 ch->counts[CHET_IE]); 333 vprintk("type #4 (dt): 0x%x+%d [data transfer]\n", 334 ch->firsts[CHET_DT], 335 ch->counts[CHET_DT]); 336 } else { 337 vprintk("reading element address assigment page failed!\n"); 338 } 339 340 /* vendor specific element types */ 341 for (i = 0; i < 4; i++) { 342 if (0 == vendor_counts[i]) 343 continue; 344 if (NULL == vendor_labels[i]) 345 continue; 346 ch->firsts[CHET_V1+i] = vendor_firsts[i]; 347 ch->counts[CHET_V1+i] = vendor_counts[i]; 348 vprintk("type #%d (v%d): 0x%x+%d [%s, vendor specific]\n", 349 i+5,i+1,vendor_firsts[i],vendor_counts[i], 350 vendor_labels[i]); 351 } 352 353 /* look up the devices of the data transfer elements */ 354 ch->dt = kmalloc(ch->counts[CHET_DT]*sizeof(struct scsi_device), 355 GFP_KERNEL); 356 357 if (!ch->dt) { 358 kfree(buffer); 359 return -ENOMEM; 360 } 361 362 for (elem = 0; elem < ch->counts[CHET_DT]; elem++) { 363 id = -1; 364 lun = 0; 365 if (elem < CH_DT_MAX && -1 != dt_id[elem]) { 366 id = dt_id[elem]; 367 lun = dt_lun[elem]; 368 vprintk("dt 0x%x: [insmod option] ", 369 elem+ch->firsts[CHET_DT]); 370 } else if (0 != ch_read_element_status 371 (ch,elem+ch->firsts[CHET_DT],data)) { 372 vprintk("dt 0x%x: READ ELEMENT STATUS failed\n", 373 elem+ch->firsts[CHET_DT]); 374 } else { 375 vprintk("dt 0x%x: ",elem+ch->firsts[CHET_DT]); 376 if (data[6] & 0x80) { 377 if (verbose) 378 printk("not this SCSI bus\n"); 379 ch->dt[elem] = NULL; 380 } else if (0 == (data[6] & 0x30)) { 381 if (verbose) 382 printk("ID/LUN unknown\n"); 383 ch->dt[elem] = NULL; 384 } else { 385 id = ch->device->id; 386 lun = 0; 387 if (data[6] & 0x20) id = data[7]; 388 if (data[6] & 0x10) lun = data[6] & 7; 389 } 390 } 391 if (-1 != id) { 392 if (verbose) 393 printk("ID %i, LUN %i, ",id,lun); 394 ch->dt[elem] = 395 scsi_device_lookup(ch->device->host, 396 ch->device->channel, 397 id,lun); 398 if (!ch->dt[elem]) { 399 /* should not happen */ 400 if (verbose) 401 printk("Huh? device not found!\n"); 402 } else { 403 if (verbose) 404 printk("name: %8.8s %16.16s %4.4s\n", 405 ch->dt[elem]->vendor, 406 ch->dt[elem]->model, 407 ch->dt[elem]->rev); 408 } 409 } 410 } 411 ch->voltags = 1; 412 kfree(buffer); 413 414 return 0; 415 } 416 417 /* ------------------------------------------------------------------------ */ 418 419 static int 420 ch_position(scsi_changer *ch, u_int trans, u_int elem, int rotate) 421 { 422 u_char cmd[10]; 423 424 dprintk("position: 0x%x\n",elem); 425 if (0 == trans) 426 trans = ch->firsts[CHET_MT]; 427 memset(cmd,0,sizeof(cmd)); 428 cmd[0] = POSITION_TO_ELEMENT; 429 cmd[1] = ch->device->lun << 5; 430 cmd[2] = (trans >> 8) & 0xff; 431 cmd[3] = trans & 0xff; 432 cmd[4] = (elem >> 8) & 0xff; 433 cmd[5] = elem & 0xff; 434 cmd[8] = rotate ? 1 : 0; 435 return ch_do_scsi(ch, cmd, NULL, 0, DMA_NONE); 436 } 437 438 static int 439 ch_move(scsi_changer *ch, u_int trans, u_int src, u_int dest, int rotate) 440 { 441 u_char cmd[12]; 442 443 dprintk("move: 0x%x => 0x%x\n",src,dest); 444 if (0 == trans) 445 trans = ch->firsts[CHET_MT]; 446 memset(cmd,0,sizeof(cmd)); 447 cmd[0] = MOVE_MEDIUM; 448 cmd[1] = ch->device->lun << 5; 449 cmd[2] = (trans >> 8) & 0xff; 450 cmd[3] = trans & 0xff; 451 cmd[4] = (src >> 8) & 0xff; 452 cmd[5] = src & 0xff; 453 cmd[6] = (dest >> 8) & 0xff; 454 cmd[7] = dest & 0xff; 455 cmd[10] = rotate ? 1 : 0; 456 return ch_do_scsi(ch, cmd, NULL,0, DMA_NONE); 457 } 458 459 static int 460 ch_exchange(scsi_changer *ch, u_int trans, u_int src, 461 u_int dest1, u_int dest2, int rotate1, int rotate2) 462 { 463 u_char cmd[12]; 464 465 dprintk("exchange: 0x%x => 0x%x => 0x%x\n", 466 src,dest1,dest2); 467 if (0 == trans) 468 trans = ch->firsts[CHET_MT]; 469 memset(cmd,0,sizeof(cmd)); 470 cmd[0] = EXCHANGE_MEDIUM; 471 cmd[1] = ch->device->lun << 5; 472 cmd[2] = (trans >> 8) & 0xff; 473 cmd[3] = trans & 0xff; 474 cmd[4] = (src >> 8) & 0xff; 475 cmd[5] = src & 0xff; 476 cmd[6] = (dest1 >> 8) & 0xff; 477 cmd[7] = dest1 & 0xff; 478 cmd[8] = (dest2 >> 8) & 0xff; 479 cmd[9] = dest2 & 0xff; 480 cmd[10] = (rotate1 ? 1 : 0) | (rotate2 ? 2 : 0); 481 482 return ch_do_scsi(ch, cmd, NULL,0, DMA_NONE); 483 } 484 485 static void 486 ch_check_voltag(char *tag) 487 { 488 int i; 489 490 for (i = 0; i < 32; i++) { 491 /* restrict to ascii */ 492 if (tag[i] >= 0x7f || tag[i] < 0x20) 493 tag[i] = ' '; 494 /* don't allow search wildcards */ 495 if (tag[i] == '?' || 496 tag[i] == '*') 497 tag[i] = ' '; 498 } 499 } 500 501 static int 502 ch_set_voltag(scsi_changer *ch, u_int elem, 503 int alternate, int clear, u_char *tag) 504 { 505 u_char cmd[12]; 506 u_char *buffer; 507 int result; 508 509 buffer = kzalloc(512, GFP_KERNEL); 510 if (!buffer) 511 return -ENOMEM; 512 513 dprintk("%s %s voltag: 0x%x => \"%s\"\n", 514 clear ? "clear" : "set", 515 alternate ? "alternate" : "primary", 516 elem, tag); 517 memset(cmd,0,sizeof(cmd)); 518 cmd[0] = SEND_VOLUME_TAG; 519 cmd[1] = (ch->device->lun << 5) | 520 ch_elem_to_typecode(ch,elem); 521 cmd[2] = (elem >> 8) & 0xff; 522 cmd[3] = elem & 0xff; 523 cmd[5] = clear 524 ? (alternate ? 0x0d : 0x0c) 525 : (alternate ? 0x0b : 0x0a); 526 527 cmd[9] = 255; 528 529 memcpy(buffer,tag,32); 530 ch_check_voltag(buffer); 531 532 result = ch_do_scsi(ch, cmd, buffer, 256, DMA_TO_DEVICE); 533 kfree(buffer); 534 return result; 535 } 536 537 static int ch_gstatus(scsi_changer *ch, int type, unsigned char __user *dest) 538 { 539 int retval = 0; 540 u_char data[16]; 541 unsigned int i; 542 543 mutex_lock(&ch->lock); 544 for (i = 0; i < ch->counts[type]; i++) { 545 if (0 != ch_read_element_status 546 (ch, ch->firsts[type]+i,data)) { 547 retval = -EIO; 548 break; 549 } 550 put_user(data[2], dest+i); 551 if (data[2] & CESTATUS_EXCEPT) 552 vprintk("element 0x%x: asc=0x%x, ascq=0x%x\n", 553 ch->firsts[type]+i, 554 (int)data[4],(int)data[5]); 555 retval = ch_read_element_status 556 (ch, ch->firsts[type]+i,data); 557 if (0 != retval) 558 break; 559 } 560 mutex_unlock(&ch->lock); 561 return retval; 562 } 563 564 /* ------------------------------------------------------------------------ */ 565 566 static int 567 ch_release(struct inode *inode, struct file *file) 568 { 569 scsi_changer *ch = file->private_data; 570 571 scsi_device_put(ch->device); 572 file->private_data = NULL; 573 return 0; 574 } 575 576 static int 577 ch_open(struct inode *inode, struct file *file) 578 { 579 scsi_changer *ch; 580 int minor = iminor(inode); 581 582 lock_kernel(); 583 spin_lock(&ch_index_lock); 584 ch = idr_find(&ch_index_idr, minor); 585 586 if (NULL == ch || scsi_device_get(ch->device)) { 587 spin_unlock(&ch_index_lock); 588 unlock_kernel(); 589 return -ENXIO; 590 } 591 spin_unlock(&ch_index_lock); 592 593 file->private_data = ch; 594 unlock_kernel(); 595 return 0; 596 } 597 598 static int 599 ch_checkrange(scsi_changer *ch, unsigned int type, unsigned int unit) 600 { 601 if (type >= CH_TYPES || unit >= ch->counts[type]) 602 return -1; 603 return 0; 604 } 605 606 static long ch_ioctl(struct file *file, 607 unsigned int cmd, unsigned long arg) 608 { 609 scsi_changer *ch = file->private_data; 610 int retval; 611 void __user *argp = (void __user *)arg; 612 613 switch (cmd) { 614 case CHIOGPARAMS: 615 { 616 struct changer_params params; 617 618 params.cp_curpicker = 0; 619 params.cp_npickers = ch->counts[CHET_MT]; 620 params.cp_nslots = ch->counts[CHET_ST]; 621 params.cp_nportals = ch->counts[CHET_IE]; 622 params.cp_ndrives = ch->counts[CHET_DT]; 623 624 if (copy_to_user(argp, ¶ms, sizeof(params))) 625 return -EFAULT; 626 return 0; 627 } 628 case CHIOGVPARAMS: 629 { 630 struct changer_vendor_params vparams; 631 632 memset(&vparams,0,sizeof(vparams)); 633 if (ch->counts[CHET_V1]) { 634 vparams.cvp_n1 = ch->counts[CHET_V1]; 635 strncpy(vparams.cvp_label1,vendor_labels[0],16); 636 } 637 if (ch->counts[CHET_V2]) { 638 vparams.cvp_n2 = ch->counts[CHET_V2]; 639 strncpy(vparams.cvp_label2,vendor_labels[1],16); 640 } 641 if (ch->counts[CHET_V3]) { 642 vparams.cvp_n3 = ch->counts[CHET_V3]; 643 strncpy(vparams.cvp_label3,vendor_labels[2],16); 644 } 645 if (ch->counts[CHET_V4]) { 646 vparams.cvp_n4 = ch->counts[CHET_V4]; 647 strncpy(vparams.cvp_label4,vendor_labels[3],16); 648 } 649 if (copy_to_user(argp, &vparams, sizeof(vparams))) 650 return -EFAULT; 651 return 0; 652 } 653 654 case CHIOPOSITION: 655 { 656 struct changer_position pos; 657 658 if (copy_from_user(&pos, argp, sizeof (pos))) 659 return -EFAULT; 660 661 if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) { 662 dprintk("CHIOPOSITION: invalid parameter\n"); 663 return -EBADSLT; 664 } 665 mutex_lock(&ch->lock); 666 retval = ch_position(ch,0, 667 ch->firsts[pos.cp_type] + pos.cp_unit, 668 pos.cp_flags & CP_INVERT); 669 mutex_unlock(&ch->lock); 670 return retval; 671 } 672 673 case CHIOMOVE: 674 { 675 struct changer_move mv; 676 677 if (copy_from_user(&mv, argp, sizeof (mv))) 678 return -EFAULT; 679 680 if (0 != ch_checkrange(ch, mv.cm_fromtype, mv.cm_fromunit) || 681 0 != ch_checkrange(ch, mv.cm_totype, mv.cm_tounit )) { 682 dprintk("CHIOMOVE: invalid parameter\n"); 683 return -EBADSLT; 684 } 685 686 mutex_lock(&ch->lock); 687 retval = ch_move(ch,0, 688 ch->firsts[mv.cm_fromtype] + mv.cm_fromunit, 689 ch->firsts[mv.cm_totype] + mv.cm_tounit, 690 mv.cm_flags & CM_INVERT); 691 mutex_unlock(&ch->lock); 692 return retval; 693 } 694 695 case CHIOEXCHANGE: 696 { 697 struct changer_exchange mv; 698 699 if (copy_from_user(&mv, argp, sizeof (mv))) 700 return -EFAULT; 701 702 if (0 != ch_checkrange(ch, mv.ce_srctype, mv.ce_srcunit ) || 703 0 != ch_checkrange(ch, mv.ce_fdsttype, mv.ce_fdstunit) || 704 0 != ch_checkrange(ch, mv.ce_sdsttype, mv.ce_sdstunit)) { 705 dprintk("CHIOEXCHANGE: invalid parameter\n"); 706 return -EBADSLT; 707 } 708 709 mutex_lock(&ch->lock); 710 retval = ch_exchange 711 (ch,0, 712 ch->firsts[mv.ce_srctype] + mv.ce_srcunit, 713 ch->firsts[mv.ce_fdsttype] + mv.ce_fdstunit, 714 ch->firsts[mv.ce_sdsttype] + mv.ce_sdstunit, 715 mv.ce_flags & CE_INVERT1, mv.ce_flags & CE_INVERT2); 716 mutex_unlock(&ch->lock); 717 return retval; 718 } 719 720 case CHIOGSTATUS: 721 { 722 struct changer_element_status ces; 723 724 if (copy_from_user(&ces, argp, sizeof (ces))) 725 return -EFAULT; 726 if (ces.ces_type < 0 || ces.ces_type >= CH_TYPES) 727 return -EINVAL; 728 729 return ch_gstatus(ch, ces.ces_type, ces.ces_data); 730 } 731 732 case CHIOGELEM: 733 { 734 struct changer_get_element cge; 735 u_char ch_cmd[12]; 736 u_char *buffer; 737 unsigned int elem; 738 int result,i; 739 740 if (copy_from_user(&cge, argp, sizeof (cge))) 741 return -EFAULT; 742 743 if (0 != ch_checkrange(ch, cge.cge_type, cge.cge_unit)) 744 return -EINVAL; 745 elem = ch->firsts[cge.cge_type] + cge.cge_unit; 746 747 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); 748 if (!buffer) 749 return -ENOMEM; 750 mutex_lock(&ch->lock); 751 752 voltag_retry: 753 memset(ch_cmd, 0, sizeof(ch_cmd)); 754 ch_cmd[0] = READ_ELEMENT_STATUS; 755 ch_cmd[1] = (ch->device->lun << 5) | 756 (ch->voltags ? 0x10 : 0) | 757 ch_elem_to_typecode(ch,elem); 758 ch_cmd[2] = (elem >> 8) & 0xff; 759 ch_cmd[3] = elem & 0xff; 760 ch_cmd[5] = 1; 761 ch_cmd[9] = 255; 762 763 result = ch_do_scsi(ch, ch_cmd, buffer, 256, DMA_FROM_DEVICE); 764 if (!result) { 765 cge.cge_status = buffer[18]; 766 cge.cge_flags = 0; 767 if (buffer[18] & CESTATUS_EXCEPT) { 768 cge.cge_errno = EIO; 769 } 770 if (buffer[25] & 0x80) { 771 cge.cge_flags |= CGE_SRC; 772 if (buffer[25] & 0x40) 773 cge.cge_flags |= CGE_INVERT; 774 elem = (buffer[26]<<8) | buffer[27]; 775 for (i = 0; i < 4; i++) { 776 if (elem >= ch->firsts[i] && 777 elem < ch->firsts[i] + ch->counts[i]) { 778 cge.cge_srctype = i; 779 cge.cge_srcunit = elem-ch->firsts[i]; 780 } 781 } 782 } 783 if ((buffer[22] & 0x30) == 0x30) { 784 cge.cge_flags |= CGE_IDLUN; 785 cge.cge_id = buffer[23]; 786 cge.cge_lun = buffer[22] & 7; 787 } 788 if (buffer[9] & 0x80) { 789 cge.cge_flags |= CGE_PVOLTAG; 790 memcpy(cge.cge_pvoltag,buffer+28,36); 791 } 792 if (buffer[9] & 0x40) { 793 cge.cge_flags |= CGE_AVOLTAG; 794 memcpy(cge.cge_avoltag,buffer+64,36); 795 } 796 } else if (ch->voltags) { 797 ch->voltags = 0; 798 vprintk("device has no volume tag support\n"); 799 goto voltag_retry; 800 } 801 kfree(buffer); 802 mutex_unlock(&ch->lock); 803 804 if (copy_to_user(argp, &cge, sizeof (cge))) 805 return -EFAULT; 806 return result; 807 } 808 809 case CHIOINITELEM: 810 { 811 mutex_lock(&ch->lock); 812 retval = ch_init_elem(ch); 813 mutex_unlock(&ch->lock); 814 return retval; 815 } 816 817 case CHIOSVOLTAG: 818 { 819 struct changer_set_voltag csv; 820 int elem; 821 822 if (copy_from_user(&csv, argp, sizeof(csv))) 823 return -EFAULT; 824 825 if (0 != ch_checkrange(ch, csv.csv_type, csv.csv_unit)) { 826 dprintk("CHIOSVOLTAG: invalid parameter\n"); 827 return -EBADSLT; 828 } 829 elem = ch->firsts[csv.csv_type] + csv.csv_unit; 830 mutex_lock(&ch->lock); 831 retval = ch_set_voltag(ch, elem, 832 csv.csv_flags & CSV_AVOLTAG, 833 csv.csv_flags & CSV_CLEARTAG, 834 csv.csv_voltag); 835 mutex_unlock(&ch->lock); 836 return retval; 837 } 838 839 default: 840 return scsi_ioctl(ch->device, cmd, argp); 841 842 } 843 } 844 845 #ifdef CONFIG_COMPAT 846 847 struct changer_element_status32 { 848 int ces_type; 849 compat_uptr_t ces_data; 850 }; 851 #define CHIOGSTATUS32 _IOW('c', 8,struct changer_element_status32) 852 853 static long ch_ioctl_compat(struct file * file, 854 unsigned int cmd, unsigned long arg) 855 { 856 scsi_changer *ch = file->private_data; 857 858 switch (cmd) { 859 case CHIOGPARAMS: 860 case CHIOGVPARAMS: 861 case CHIOPOSITION: 862 case CHIOMOVE: 863 case CHIOEXCHANGE: 864 case CHIOGELEM: 865 case CHIOINITELEM: 866 case CHIOSVOLTAG: 867 /* compatible */ 868 return ch_ioctl(file, cmd, arg); 869 case CHIOGSTATUS32: 870 { 871 struct changer_element_status32 ces32; 872 unsigned char __user *data; 873 874 if (copy_from_user(&ces32, (void __user *)arg, sizeof (ces32))) 875 return -EFAULT; 876 if (ces32.ces_type < 0 || ces32.ces_type >= CH_TYPES) 877 return -EINVAL; 878 879 data = compat_ptr(ces32.ces_data); 880 return ch_gstatus(ch, ces32.ces_type, data); 881 } 882 default: 883 // return scsi_ioctl_compat(ch->device, cmd, (void*)arg); 884 return -ENOIOCTLCMD; 885 886 } 887 } 888 #endif 889 890 /* ------------------------------------------------------------------------ */ 891 892 static int ch_probe(struct device *dev) 893 { 894 struct scsi_device *sd = to_scsi_device(dev); 895 struct device *class_dev; 896 int minor, ret = -ENOMEM; 897 scsi_changer *ch; 898 899 if (sd->type != TYPE_MEDIUM_CHANGER) 900 return -ENODEV; 901 902 ch = kzalloc(sizeof(*ch), GFP_KERNEL); 903 if (NULL == ch) 904 return -ENOMEM; 905 906 if (!idr_pre_get(&ch_index_idr, GFP_KERNEL)) 907 goto free_ch; 908 909 spin_lock(&ch_index_lock); 910 ret = idr_get_new(&ch_index_idr, ch, &minor); 911 spin_unlock(&ch_index_lock); 912 913 if (ret) 914 goto free_ch; 915 916 if (minor > CH_MAX_DEVS) { 917 ret = -ENODEV; 918 goto remove_idr; 919 } 920 921 ch->minor = minor; 922 sprintf(ch->name,"ch%d",ch->minor); 923 924 class_dev = device_create(ch_sysfs_class, dev, 925 MKDEV(SCSI_CHANGER_MAJOR, ch->minor), ch, 926 "s%s", ch->name); 927 if (IS_ERR(class_dev)) { 928 printk(KERN_WARNING "ch%d: device_create failed\n", 929 ch->minor); 930 ret = PTR_ERR(class_dev); 931 goto remove_idr; 932 } 933 934 mutex_init(&ch->lock); 935 ch->device = sd; 936 ch_readconfig(ch); 937 if (init) 938 ch_init_elem(ch); 939 940 dev_set_drvdata(dev, ch); 941 sdev_printk(KERN_INFO, sd, "Attached scsi changer %s\n", ch->name); 942 943 return 0; 944 remove_idr: 945 idr_remove(&ch_index_idr, minor); 946 free_ch: 947 kfree(ch); 948 return ret; 949 } 950 951 static int ch_remove(struct device *dev) 952 { 953 scsi_changer *ch = dev_get_drvdata(dev); 954 955 spin_lock(&ch_index_lock); 956 idr_remove(&ch_index_idr, ch->minor); 957 spin_unlock(&ch_index_lock); 958 959 device_destroy(ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR,ch->minor)); 960 kfree(ch->dt); 961 kfree(ch); 962 return 0; 963 } 964 965 static struct scsi_driver ch_template = { 966 .owner = THIS_MODULE, 967 .gendrv = { 968 .name = "ch", 969 .probe = ch_probe, 970 .remove = ch_remove, 971 }, 972 }; 973 974 static const struct file_operations changer_fops = { 975 .owner = THIS_MODULE, 976 .open = ch_open, 977 .release = ch_release, 978 .unlocked_ioctl = ch_ioctl, 979 #ifdef CONFIG_COMPAT 980 .compat_ioctl = ch_ioctl_compat, 981 #endif 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