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 for (elem = 0; elem < ch->counts[CHET_DT]; elem++) { 357 id = -1; 358 lun = 0; 359 if (elem < CH_DT_MAX && -1 != dt_id[elem]) { 360 id = dt_id[elem]; 361 lun = dt_lun[elem]; 362 vprintk("dt 0x%x: [insmod option] ", 363 elem+ch->firsts[CHET_DT]); 364 } else if (0 != ch_read_element_status 365 (ch,elem+ch->firsts[CHET_DT],data)) { 366 vprintk("dt 0x%x: READ ELEMENT STATUS failed\n", 367 elem+ch->firsts[CHET_DT]); 368 } else { 369 vprintk("dt 0x%x: ",elem+ch->firsts[CHET_DT]); 370 if (data[6] & 0x80) { 371 if (verbose) 372 printk("not this SCSI bus\n"); 373 ch->dt[elem] = NULL; 374 } else if (0 == (data[6] & 0x30)) { 375 if (verbose) 376 printk("ID/LUN unknown\n"); 377 ch->dt[elem] = NULL; 378 } else { 379 id = ch->device->id; 380 lun = 0; 381 if (data[6] & 0x20) id = data[7]; 382 if (data[6] & 0x10) lun = data[6] & 7; 383 } 384 } 385 if (-1 != id) { 386 if (verbose) 387 printk("ID %i, LUN %i, ",id,lun); 388 ch->dt[elem] = 389 scsi_device_lookup(ch->device->host, 390 ch->device->channel, 391 id,lun); 392 if (!ch->dt[elem]) { 393 /* should not happen */ 394 if (verbose) 395 printk("Huh? device not found!\n"); 396 } else { 397 if (verbose) 398 printk("name: %8.8s %16.16s %4.4s\n", 399 ch->dt[elem]->vendor, 400 ch->dt[elem]->model, 401 ch->dt[elem]->rev); 402 } 403 } 404 } 405 ch->voltags = 1; 406 kfree(buffer); 407 408 return 0; 409 } 410 411 /* ------------------------------------------------------------------------ */ 412 413 static int 414 ch_position(scsi_changer *ch, u_int trans, u_int elem, int rotate) 415 { 416 u_char cmd[10]; 417 418 dprintk("position: 0x%x\n",elem); 419 if (0 == trans) 420 trans = ch->firsts[CHET_MT]; 421 memset(cmd,0,sizeof(cmd)); 422 cmd[0] = POSITION_TO_ELEMENT; 423 cmd[1] = ch->device->lun << 5; 424 cmd[2] = (trans >> 8) & 0xff; 425 cmd[3] = trans & 0xff; 426 cmd[4] = (elem >> 8) & 0xff; 427 cmd[5] = elem & 0xff; 428 cmd[8] = rotate ? 1 : 0; 429 return ch_do_scsi(ch, cmd, NULL, 0, DMA_NONE); 430 } 431 432 static int 433 ch_move(scsi_changer *ch, u_int trans, u_int src, u_int dest, int rotate) 434 { 435 u_char cmd[12]; 436 437 dprintk("move: 0x%x => 0x%x\n",src,dest); 438 if (0 == trans) 439 trans = ch->firsts[CHET_MT]; 440 memset(cmd,0,sizeof(cmd)); 441 cmd[0] = MOVE_MEDIUM; 442 cmd[1] = ch->device->lun << 5; 443 cmd[2] = (trans >> 8) & 0xff; 444 cmd[3] = trans & 0xff; 445 cmd[4] = (src >> 8) & 0xff; 446 cmd[5] = src & 0xff; 447 cmd[6] = (dest >> 8) & 0xff; 448 cmd[7] = dest & 0xff; 449 cmd[10] = rotate ? 1 : 0; 450 return ch_do_scsi(ch, cmd, NULL,0, DMA_NONE); 451 } 452 453 static int 454 ch_exchange(scsi_changer *ch, u_int trans, u_int src, 455 u_int dest1, u_int dest2, int rotate1, int rotate2) 456 { 457 u_char cmd[12]; 458 459 dprintk("exchange: 0x%x => 0x%x => 0x%x\n", 460 src,dest1,dest2); 461 if (0 == trans) 462 trans = ch->firsts[CHET_MT]; 463 memset(cmd,0,sizeof(cmd)); 464 cmd[0] = EXCHANGE_MEDIUM; 465 cmd[1] = ch->device->lun << 5; 466 cmd[2] = (trans >> 8) & 0xff; 467 cmd[3] = trans & 0xff; 468 cmd[4] = (src >> 8) & 0xff; 469 cmd[5] = src & 0xff; 470 cmd[6] = (dest1 >> 8) & 0xff; 471 cmd[7] = dest1 & 0xff; 472 cmd[8] = (dest2 >> 8) & 0xff; 473 cmd[9] = dest2 & 0xff; 474 cmd[10] = (rotate1 ? 1 : 0) | (rotate2 ? 2 : 0); 475 476 return ch_do_scsi(ch, cmd, NULL,0, DMA_NONE); 477 } 478 479 static void 480 ch_check_voltag(char *tag) 481 { 482 int i; 483 484 for (i = 0; i < 32; i++) { 485 /* restrict to ascii */ 486 if (tag[i] >= 0x7f || tag[i] < 0x20) 487 tag[i] = ' '; 488 /* don't allow search wildcards */ 489 if (tag[i] == '?' || 490 tag[i] == '*') 491 tag[i] = ' '; 492 } 493 } 494 495 static int 496 ch_set_voltag(scsi_changer *ch, u_int elem, 497 int alternate, int clear, u_char *tag) 498 { 499 u_char cmd[12]; 500 u_char *buffer; 501 int result; 502 503 buffer = kzalloc(512, GFP_KERNEL); 504 if (!buffer) 505 return -ENOMEM; 506 507 dprintk("%s %s voltag: 0x%x => \"%s\"\n", 508 clear ? "clear" : "set", 509 alternate ? "alternate" : "primary", 510 elem, tag); 511 memset(cmd,0,sizeof(cmd)); 512 cmd[0] = SEND_VOLUME_TAG; 513 cmd[1] = (ch->device->lun << 5) | 514 ch_elem_to_typecode(ch,elem); 515 cmd[2] = (elem >> 8) & 0xff; 516 cmd[3] = elem & 0xff; 517 cmd[5] = clear 518 ? (alternate ? 0x0d : 0x0c) 519 : (alternate ? 0x0b : 0x0a); 520 521 cmd[9] = 255; 522 523 memcpy(buffer,tag,32); 524 ch_check_voltag(buffer); 525 526 result = ch_do_scsi(ch, cmd, buffer, 256, DMA_TO_DEVICE); 527 kfree(buffer); 528 return result; 529 } 530 531 static int ch_gstatus(scsi_changer *ch, int type, unsigned char __user *dest) 532 { 533 int retval = 0; 534 u_char data[16]; 535 unsigned int i; 536 537 mutex_lock(&ch->lock); 538 for (i = 0; i < ch->counts[type]; i++) { 539 if (0 != ch_read_element_status 540 (ch, ch->firsts[type]+i,data)) { 541 retval = -EIO; 542 break; 543 } 544 put_user(data[2], dest+i); 545 if (data[2] & CESTATUS_EXCEPT) 546 vprintk("element 0x%x: asc=0x%x, ascq=0x%x\n", 547 ch->firsts[type]+i, 548 (int)data[4],(int)data[5]); 549 retval = ch_read_element_status 550 (ch, ch->firsts[type]+i,data); 551 if (0 != retval) 552 break; 553 } 554 mutex_unlock(&ch->lock); 555 return retval; 556 } 557 558 /* ------------------------------------------------------------------------ */ 559 560 static int 561 ch_release(struct inode *inode, struct file *file) 562 { 563 scsi_changer *ch = file->private_data; 564 565 scsi_device_put(ch->device); 566 file->private_data = NULL; 567 return 0; 568 } 569 570 static int 571 ch_open(struct inode *inode, struct file *file) 572 { 573 scsi_changer *ch; 574 int minor = iminor(inode); 575 576 lock_kernel(); 577 spin_lock(&ch_index_lock); 578 ch = idr_find(&ch_index_idr, minor); 579 580 if (NULL == ch || scsi_device_get(ch->device)) { 581 spin_unlock(&ch_index_lock); 582 unlock_kernel(); 583 return -ENXIO; 584 } 585 spin_unlock(&ch_index_lock); 586 587 file->private_data = ch; 588 unlock_kernel(); 589 return 0; 590 } 591 592 static int 593 ch_checkrange(scsi_changer *ch, unsigned int type, unsigned int unit) 594 { 595 if (type >= CH_TYPES || unit >= ch->counts[type]) 596 return -1; 597 return 0; 598 } 599 600 static long ch_ioctl(struct file *file, 601 unsigned int cmd, unsigned long arg) 602 { 603 scsi_changer *ch = file->private_data; 604 int retval; 605 void __user *argp = (void __user *)arg; 606 607 switch (cmd) { 608 case CHIOGPARAMS: 609 { 610 struct changer_params params; 611 612 params.cp_curpicker = 0; 613 params.cp_npickers = ch->counts[CHET_MT]; 614 params.cp_nslots = ch->counts[CHET_ST]; 615 params.cp_nportals = ch->counts[CHET_IE]; 616 params.cp_ndrives = ch->counts[CHET_DT]; 617 618 if (copy_to_user(argp, ¶ms, sizeof(params))) 619 return -EFAULT; 620 return 0; 621 } 622 case CHIOGVPARAMS: 623 { 624 struct changer_vendor_params vparams; 625 626 memset(&vparams,0,sizeof(vparams)); 627 if (ch->counts[CHET_V1]) { 628 vparams.cvp_n1 = ch->counts[CHET_V1]; 629 strncpy(vparams.cvp_label1,vendor_labels[0],16); 630 } 631 if (ch->counts[CHET_V2]) { 632 vparams.cvp_n2 = ch->counts[CHET_V2]; 633 strncpy(vparams.cvp_label2,vendor_labels[1],16); 634 } 635 if (ch->counts[CHET_V3]) { 636 vparams.cvp_n3 = ch->counts[CHET_V3]; 637 strncpy(vparams.cvp_label3,vendor_labels[2],16); 638 } 639 if (ch->counts[CHET_V4]) { 640 vparams.cvp_n4 = ch->counts[CHET_V4]; 641 strncpy(vparams.cvp_label4,vendor_labels[3],16); 642 } 643 if (copy_to_user(argp, &vparams, sizeof(vparams))) 644 return -EFAULT; 645 return 0; 646 } 647 648 case CHIOPOSITION: 649 { 650 struct changer_position pos; 651 652 if (copy_from_user(&pos, argp, sizeof (pos))) 653 return -EFAULT; 654 655 if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) { 656 dprintk("CHIOPOSITION: invalid parameter\n"); 657 return -EBADSLT; 658 } 659 mutex_lock(&ch->lock); 660 retval = ch_position(ch,0, 661 ch->firsts[pos.cp_type] + pos.cp_unit, 662 pos.cp_flags & CP_INVERT); 663 mutex_unlock(&ch->lock); 664 return retval; 665 } 666 667 case CHIOMOVE: 668 { 669 struct changer_move mv; 670 671 if (copy_from_user(&mv, argp, sizeof (mv))) 672 return -EFAULT; 673 674 if (0 != ch_checkrange(ch, mv.cm_fromtype, mv.cm_fromunit) || 675 0 != ch_checkrange(ch, mv.cm_totype, mv.cm_tounit )) { 676 dprintk("CHIOMOVE: invalid parameter\n"); 677 return -EBADSLT; 678 } 679 680 mutex_lock(&ch->lock); 681 retval = ch_move(ch,0, 682 ch->firsts[mv.cm_fromtype] + mv.cm_fromunit, 683 ch->firsts[mv.cm_totype] + mv.cm_tounit, 684 mv.cm_flags & CM_INVERT); 685 mutex_unlock(&ch->lock); 686 return retval; 687 } 688 689 case CHIOEXCHANGE: 690 { 691 struct changer_exchange mv; 692 693 if (copy_from_user(&mv, argp, sizeof (mv))) 694 return -EFAULT; 695 696 if (0 != ch_checkrange(ch, mv.ce_srctype, mv.ce_srcunit ) || 697 0 != ch_checkrange(ch, mv.ce_fdsttype, mv.ce_fdstunit) || 698 0 != ch_checkrange(ch, mv.ce_sdsttype, mv.ce_sdstunit)) { 699 dprintk("CHIOEXCHANGE: invalid parameter\n"); 700 return -EBADSLT; 701 } 702 703 mutex_lock(&ch->lock); 704 retval = ch_exchange 705 (ch,0, 706 ch->firsts[mv.ce_srctype] + mv.ce_srcunit, 707 ch->firsts[mv.ce_fdsttype] + mv.ce_fdstunit, 708 ch->firsts[mv.ce_sdsttype] + mv.ce_sdstunit, 709 mv.ce_flags & CE_INVERT1, mv.ce_flags & CE_INVERT2); 710 mutex_unlock(&ch->lock); 711 return retval; 712 } 713 714 case CHIOGSTATUS: 715 { 716 struct changer_element_status ces; 717 718 if (copy_from_user(&ces, argp, sizeof (ces))) 719 return -EFAULT; 720 if (ces.ces_type < 0 || ces.ces_type >= CH_TYPES) 721 return -EINVAL; 722 723 return ch_gstatus(ch, ces.ces_type, ces.ces_data); 724 } 725 726 case CHIOGELEM: 727 { 728 struct changer_get_element cge; 729 u_char ch_cmd[12]; 730 u_char *buffer; 731 unsigned int elem; 732 int result,i; 733 734 if (copy_from_user(&cge, argp, sizeof (cge))) 735 return -EFAULT; 736 737 if (0 != ch_checkrange(ch, cge.cge_type, cge.cge_unit)) 738 return -EINVAL; 739 elem = ch->firsts[cge.cge_type] + cge.cge_unit; 740 741 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); 742 if (!buffer) 743 return -ENOMEM; 744 mutex_lock(&ch->lock); 745 746 voltag_retry: 747 memset(ch_cmd, 0, sizeof(ch_cmd)); 748 ch_cmd[0] = READ_ELEMENT_STATUS; 749 ch_cmd[1] = (ch->device->lun << 5) | 750 (ch->voltags ? 0x10 : 0) | 751 ch_elem_to_typecode(ch,elem); 752 ch_cmd[2] = (elem >> 8) & 0xff; 753 ch_cmd[3] = elem & 0xff; 754 ch_cmd[5] = 1; 755 ch_cmd[9] = 255; 756 757 result = ch_do_scsi(ch, ch_cmd, buffer, 256, DMA_FROM_DEVICE); 758 if (!result) { 759 cge.cge_status = buffer[18]; 760 cge.cge_flags = 0; 761 if (buffer[18] & CESTATUS_EXCEPT) { 762 cge.cge_errno = EIO; 763 } 764 if (buffer[25] & 0x80) { 765 cge.cge_flags |= CGE_SRC; 766 if (buffer[25] & 0x40) 767 cge.cge_flags |= CGE_INVERT; 768 elem = (buffer[26]<<8) | buffer[27]; 769 for (i = 0; i < 4; i++) { 770 if (elem >= ch->firsts[i] && 771 elem < ch->firsts[i] + ch->counts[i]) { 772 cge.cge_srctype = i; 773 cge.cge_srcunit = elem-ch->firsts[i]; 774 } 775 } 776 } 777 if ((buffer[22] & 0x30) == 0x30) { 778 cge.cge_flags |= CGE_IDLUN; 779 cge.cge_id = buffer[23]; 780 cge.cge_lun = buffer[22] & 7; 781 } 782 if (buffer[9] & 0x80) { 783 cge.cge_flags |= CGE_PVOLTAG; 784 memcpy(cge.cge_pvoltag,buffer+28,36); 785 } 786 if (buffer[9] & 0x40) { 787 cge.cge_flags |= CGE_AVOLTAG; 788 memcpy(cge.cge_avoltag,buffer+64,36); 789 } 790 } else if (ch->voltags) { 791 ch->voltags = 0; 792 vprintk("device has no volume tag support\n"); 793 goto voltag_retry; 794 } 795 kfree(buffer); 796 mutex_unlock(&ch->lock); 797 798 if (copy_to_user(argp, &cge, sizeof (cge))) 799 return -EFAULT; 800 return result; 801 } 802 803 case CHIOINITELEM: 804 { 805 mutex_lock(&ch->lock); 806 retval = ch_init_elem(ch); 807 mutex_unlock(&ch->lock); 808 return retval; 809 } 810 811 case CHIOSVOLTAG: 812 { 813 struct changer_set_voltag csv; 814 int elem; 815 816 if (copy_from_user(&csv, argp, sizeof(csv))) 817 return -EFAULT; 818 819 if (0 != ch_checkrange(ch, csv.csv_type, csv.csv_unit)) { 820 dprintk("CHIOSVOLTAG: invalid parameter\n"); 821 return -EBADSLT; 822 } 823 elem = ch->firsts[csv.csv_type] + csv.csv_unit; 824 mutex_lock(&ch->lock); 825 retval = ch_set_voltag(ch, elem, 826 csv.csv_flags & CSV_AVOLTAG, 827 csv.csv_flags & CSV_CLEARTAG, 828 csv.csv_voltag); 829 mutex_unlock(&ch->lock); 830 return retval; 831 } 832 833 default: 834 return scsi_ioctl(ch->device, cmd, argp); 835 836 } 837 } 838 839 #ifdef CONFIG_COMPAT 840 841 struct changer_element_status32 { 842 int ces_type; 843 compat_uptr_t ces_data; 844 }; 845 #define CHIOGSTATUS32 _IOW('c', 8,struct changer_element_status32) 846 847 static long ch_ioctl_compat(struct file * file, 848 unsigned int cmd, unsigned long arg) 849 { 850 scsi_changer *ch = file->private_data; 851 852 switch (cmd) { 853 case CHIOGPARAMS: 854 case CHIOGVPARAMS: 855 case CHIOPOSITION: 856 case CHIOMOVE: 857 case CHIOEXCHANGE: 858 case CHIOGELEM: 859 case CHIOINITELEM: 860 case CHIOSVOLTAG: 861 /* compatible */ 862 return ch_ioctl(file, cmd, arg); 863 case CHIOGSTATUS32: 864 { 865 struct changer_element_status32 ces32; 866 unsigned char __user *data; 867 868 if (copy_from_user(&ces32, (void __user *)arg, sizeof (ces32))) 869 return -EFAULT; 870 if (ces32.ces_type < 0 || ces32.ces_type >= CH_TYPES) 871 return -EINVAL; 872 873 data = compat_ptr(ces32.ces_data); 874 return ch_gstatus(ch, ces32.ces_type, data); 875 } 876 default: 877 // return scsi_ioctl_compat(ch->device, cmd, (void*)arg); 878 return -ENOIOCTLCMD; 879 880 } 881 } 882 #endif 883 884 /* ------------------------------------------------------------------------ */ 885 886 static int ch_probe(struct device *dev) 887 { 888 struct scsi_device *sd = to_scsi_device(dev); 889 struct device *class_dev; 890 int minor, ret = -ENOMEM; 891 scsi_changer *ch; 892 893 if (sd->type != TYPE_MEDIUM_CHANGER) 894 return -ENODEV; 895 896 ch = kzalloc(sizeof(*ch), GFP_KERNEL); 897 if (NULL == ch) 898 return -ENOMEM; 899 900 if (!idr_pre_get(&ch_index_idr, GFP_KERNEL)) 901 goto free_ch; 902 903 spin_lock(&ch_index_lock); 904 ret = idr_get_new(&ch_index_idr, ch, &minor); 905 spin_unlock(&ch_index_lock); 906 907 if (ret) 908 goto free_ch; 909 910 if (minor > CH_MAX_DEVS) { 911 ret = -ENODEV; 912 goto remove_idr; 913 } 914 915 ch->minor = minor; 916 sprintf(ch->name,"ch%d",ch->minor); 917 918 class_dev = device_create(ch_sysfs_class, dev, 919 MKDEV(SCSI_CHANGER_MAJOR, ch->minor), ch, 920 "s%s", ch->name); 921 if (IS_ERR(class_dev)) { 922 printk(KERN_WARNING "ch%d: device_create failed\n", 923 ch->minor); 924 ret = PTR_ERR(class_dev); 925 goto remove_idr; 926 } 927 928 mutex_init(&ch->lock); 929 ch->device = sd; 930 ch_readconfig(ch); 931 if (init) 932 ch_init_elem(ch); 933 934 dev_set_drvdata(dev, ch); 935 sdev_printk(KERN_INFO, sd, "Attached scsi changer %s\n", ch->name); 936 937 return 0; 938 remove_idr: 939 idr_remove(&ch_index_idr, minor); 940 free_ch: 941 kfree(ch); 942 return ret; 943 } 944 945 static int ch_remove(struct device *dev) 946 { 947 scsi_changer *ch = dev_get_drvdata(dev); 948 949 spin_lock(&ch_index_lock); 950 idr_remove(&ch_index_idr, ch->minor); 951 spin_unlock(&ch_index_lock); 952 953 device_destroy(ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR,ch->minor)); 954 kfree(ch->dt); 955 kfree(ch); 956 return 0; 957 } 958 959 static struct scsi_driver ch_template = { 960 .owner = THIS_MODULE, 961 .gendrv = { 962 .name = "ch", 963 .probe = ch_probe, 964 .remove = ch_remove, 965 }, 966 }; 967 968 static const struct file_operations changer_fops = { 969 .owner = THIS_MODULE, 970 .open = ch_open, 971 .release = ch_release, 972 .unlocked_ioctl = ch_ioctl, 973 #ifdef CONFIG_COMPAT 974 .compat_ioctl = ch_ioctl_compat, 975 #endif 976 }; 977 978 static int __init init_ch_module(void) 979 { 980 int rc; 981 982 printk(KERN_INFO "SCSI Media Changer driver v" VERSION " \n"); 983 ch_sysfs_class = class_create(THIS_MODULE, "scsi_changer"); 984 if (IS_ERR(ch_sysfs_class)) { 985 rc = PTR_ERR(ch_sysfs_class); 986 return rc; 987 } 988 rc = register_chrdev(SCSI_CHANGER_MAJOR,"ch",&changer_fops); 989 if (rc < 0) { 990 printk("Unable to get major %d for SCSI-Changer\n", 991 SCSI_CHANGER_MAJOR); 992 goto fail1; 993 } 994 rc = scsi_register_driver(&ch_template.gendrv); 995 if (rc < 0) 996 goto fail2; 997 return 0; 998 999 fail2: 1000 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch"); 1001 fail1: 1002 class_destroy(ch_sysfs_class); 1003 return rc; 1004 } 1005 1006 static void __exit exit_ch_module(void) 1007 { 1008 scsi_unregister_driver(&ch_template.gendrv); 1009 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch"); 1010 class_destroy(ch_sysfs_class); 1011 idr_destroy(&ch_index_idr); 1012 } 1013 1014 module_init(init_ch_module); 1015 module_exit(exit_ch_module); 1016 1017 /* 1018 * Local variables: 1019 * c-basic-offset: 8 1020 * End: 1021 */ 1022