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 45 static int init = 1; 46 module_param(init, int, 0444); 47 MODULE_PARM_DESC(init, \ 48 "initialize element status on driver load (default: on)"); 49 50 static int timeout_move = 300; 51 module_param(timeout_move, int, 0644); 52 MODULE_PARM_DESC(timeout_move,"timeout for move commands " 53 "(default: 300 seconds)"); 54 55 static int timeout_init = 3600; 56 module_param(timeout_init, int, 0644); 57 MODULE_PARM_DESC(timeout_init,"timeout for INITIALIZE ELEMENT STATUS " 58 "(default: 3600 seconds)"); 59 60 static int verbose = 1; 61 module_param(verbose, int, 0644); 62 MODULE_PARM_DESC(verbose,"be verbose (default: on)"); 63 64 static int debug = 0; 65 module_param(debug, int, 0644); 66 MODULE_PARM_DESC(debug,"enable/disable debug messages, also prints more " 67 "detailed sense codes on scsi errors (default: off)"); 68 69 static int dt_id[CH_DT_MAX] = { [ 0 ... (CH_DT_MAX-1) ] = -1 }; 70 static int dt_lun[CH_DT_MAX]; 71 module_param_array(dt_id, int, NULL, 0444); 72 module_param_array(dt_lun, int, NULL, 0444); 73 74 /* tell the driver about vendor-specific slots */ 75 static int vendor_firsts[CH_TYPES-4]; 76 static int vendor_counts[CH_TYPES-4]; 77 module_param_array(vendor_firsts, int, NULL, 0444); 78 module_param_array(vendor_counts, int, NULL, 0444); 79 80 static const char * vendor_labels[CH_TYPES-4] = { 81 "v0", "v1", "v2", "v3" 82 }; 83 // module_param_string_array(vendor_labels, NULL, 0444); 84 85 #define dprintk(fmt, arg...) if (debug) \ 86 printk(KERN_DEBUG "%s: " fmt, ch->name , ## arg) 87 #define vprintk(fmt, arg...) if (verbose) \ 88 printk(KERN_INFO "%s: " fmt, ch->name , ## arg) 89 90 /* ------------------------------------------------------------------- */ 91 92 #define MAX_RETRIES 1 93 94 static struct class * ch_sysfs_class; 95 96 typedef struct { 97 struct list_head list; 98 int minor; 99 char name[8]; 100 struct scsi_device *device; 101 struct scsi_device **dt; /* ptrs to data transfer elements */ 102 u_int firsts[CH_TYPES]; 103 u_int counts[CH_TYPES]; 104 u_int unit_attention; 105 u_int voltags; 106 struct mutex lock; 107 } scsi_changer; 108 109 static DEFINE_IDR(ch_index_idr); 110 static DEFINE_SPINLOCK(ch_index_lock); 111 112 static const struct { 113 unsigned char sense; 114 unsigned char asc; 115 unsigned char ascq; 116 int errno; 117 } ch_err[] = { 118 /* Just filled in what looks right. Hav'nt checked any standard paper for 119 these errno assignments, so they may be wrong... */ 120 { 121 .sense = ILLEGAL_REQUEST, 122 .asc = 0x21, 123 .ascq = 0x01, 124 .errno = EBADSLT, /* Invalid element address */ 125 },{ 126 .sense = ILLEGAL_REQUEST, 127 .asc = 0x28, 128 .ascq = 0x01, 129 .errno = EBADE, /* Import or export element accessed */ 130 },{ 131 .sense = ILLEGAL_REQUEST, 132 .asc = 0x3B, 133 .ascq = 0x0D, 134 .errno = EXFULL, /* Medium destination element full */ 135 },{ 136 .sense = ILLEGAL_REQUEST, 137 .asc = 0x3B, 138 .ascq = 0x0E, 139 .errno = EBADE, /* Medium source element empty */ 140 },{ 141 .sense = ILLEGAL_REQUEST, 142 .asc = 0x20, 143 .ascq = 0x00, 144 .errno = EBADRQC, /* Invalid command operation code */ 145 },{ 146 /* end of list */ 147 } 148 }; 149 150 /* ------------------------------------------------------------------- */ 151 152 static int ch_find_errno(struct scsi_sense_hdr *sshdr) 153 { 154 int i,errno = 0; 155 156 /* Check to see if additional sense information is available */ 157 if (scsi_sense_valid(sshdr) && 158 sshdr->asc != 0) { 159 for (i = 0; ch_err[i].errno != 0; i++) { 160 if (ch_err[i].sense == sshdr->sense_key && 161 ch_err[i].asc == sshdr->asc && 162 ch_err[i].ascq == sshdr->ascq) { 163 errno = -ch_err[i].errno; 164 break; 165 } 166 } 167 } 168 if (errno == 0) 169 errno = -EIO; 170 return errno; 171 } 172 173 static int 174 ch_do_scsi(scsi_changer *ch, unsigned char *cmd, 175 void *buffer, unsigned buflength, 176 enum dma_data_direction direction) 177 { 178 int errno, retries = 0, timeout, result; 179 struct scsi_sense_hdr sshdr; 180 181 timeout = (cmd[0] == INITIALIZE_ELEMENT_STATUS) 182 ? timeout_init : timeout_move; 183 184 retry: 185 errno = 0; 186 if (debug) { 187 dprintk("command: "); 188 __scsi_print_command(cmd); 189 } 190 191 result = scsi_execute_req(ch->device, cmd, direction, buffer, 192 buflength, &sshdr, timeout * HZ, 193 MAX_RETRIES); 194 195 dprintk("result: 0x%x\n",result); 196 if (driver_byte(result) & DRIVER_SENSE) { 197 if (debug) 198 scsi_print_sense_hdr(ch->name, &sshdr); 199 errno = ch_find_errno(&sshdr); 200 201 switch(sshdr.sense_key) { 202 case UNIT_ATTENTION: 203 ch->unit_attention = 1; 204 if (retries++ < 3) 205 goto retry; 206 break; 207 } 208 } 209 return errno; 210 } 211 212 /* ------------------------------------------------------------------------ */ 213 214 static int 215 ch_elem_to_typecode(scsi_changer *ch, u_int elem) 216 { 217 int i; 218 219 for (i = 0; i < CH_TYPES; i++) { 220 if (elem >= ch->firsts[i] && 221 elem < ch->firsts[i] + 222 ch->counts[i]) 223 return i+1; 224 } 225 return 0; 226 } 227 228 static int 229 ch_read_element_status(scsi_changer *ch, u_int elem, char *data) 230 { 231 u_char cmd[12]; 232 u_char *buffer; 233 int result; 234 235 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); 236 if(!buffer) 237 return -ENOMEM; 238 239 retry: 240 memset(cmd,0,sizeof(cmd)); 241 cmd[0] = READ_ELEMENT_STATUS; 242 cmd[1] = (ch->device->lun << 5) | 243 (ch->voltags ? 0x10 : 0) | 244 ch_elem_to_typecode(ch,elem); 245 cmd[2] = (elem >> 8) & 0xff; 246 cmd[3] = elem & 0xff; 247 cmd[5] = 1; 248 cmd[9] = 255; 249 if (0 == (result = ch_do_scsi(ch, cmd, buffer, 256, DMA_FROM_DEVICE))) { 250 if (((buffer[16] << 8) | buffer[17]) != elem) { 251 dprintk("asked for element 0x%02x, got 0x%02x\n", 252 elem,(buffer[16] << 8) | buffer[17]); 253 kfree(buffer); 254 return -EIO; 255 } 256 memcpy(data,buffer+16,16); 257 } else { 258 if (ch->voltags) { 259 ch->voltags = 0; 260 vprintk("device has no volume tag support\n"); 261 goto retry; 262 } 263 dprintk("READ ELEMENT STATUS for element 0x%x failed\n",elem); 264 } 265 kfree(buffer); 266 return result; 267 } 268 269 static int 270 ch_init_elem(scsi_changer *ch) 271 { 272 int err; 273 u_char cmd[6]; 274 275 vprintk("INITIALIZE ELEMENT STATUS, may take some time ...\n"); 276 memset(cmd,0,sizeof(cmd)); 277 cmd[0] = INITIALIZE_ELEMENT_STATUS; 278 cmd[1] = ch->device->lun << 5; 279 err = ch_do_scsi(ch, cmd, NULL, 0, DMA_NONE); 280 vprintk("... finished\n"); 281 return err; 282 } 283 284 static int 285 ch_readconfig(scsi_changer *ch) 286 { 287 u_char cmd[10], data[16]; 288 u_char *buffer; 289 int result,id,lun,i; 290 u_int elem; 291 292 buffer = kzalloc(512, GFP_KERNEL | GFP_DMA); 293 if (!buffer) 294 return -ENOMEM; 295 296 memset(cmd,0,sizeof(cmd)); 297 cmd[0] = MODE_SENSE; 298 cmd[1] = ch->device->lun << 5; 299 cmd[2] = 0x1d; 300 cmd[4] = 255; 301 result = ch_do_scsi(ch, cmd, buffer, 255, DMA_FROM_DEVICE); 302 if (0 != result) { 303 cmd[1] |= (1<<3); 304 result = ch_do_scsi(ch, cmd, buffer, 255, DMA_FROM_DEVICE); 305 } 306 if (0 == result) { 307 ch->firsts[CHET_MT] = 308 (buffer[buffer[3]+ 6] << 8) | buffer[buffer[3]+ 7]; 309 ch->counts[CHET_MT] = 310 (buffer[buffer[3]+ 8] << 8) | buffer[buffer[3]+ 9]; 311 ch->firsts[CHET_ST] = 312 (buffer[buffer[3]+10] << 8) | buffer[buffer[3]+11]; 313 ch->counts[CHET_ST] = 314 (buffer[buffer[3]+12] << 8) | buffer[buffer[3]+13]; 315 ch->firsts[CHET_IE] = 316 (buffer[buffer[3]+14] << 8) | buffer[buffer[3]+15]; 317 ch->counts[CHET_IE] = 318 (buffer[buffer[3]+16] << 8) | buffer[buffer[3]+17]; 319 ch->firsts[CHET_DT] = 320 (buffer[buffer[3]+18] << 8) | buffer[buffer[3]+19]; 321 ch->counts[CHET_DT] = 322 (buffer[buffer[3]+20] << 8) | buffer[buffer[3]+21]; 323 vprintk("type #1 (mt): 0x%x+%d [medium transport]\n", 324 ch->firsts[CHET_MT], 325 ch->counts[CHET_MT]); 326 vprintk("type #2 (st): 0x%x+%d [storage]\n", 327 ch->firsts[CHET_ST], 328 ch->counts[CHET_ST]); 329 vprintk("type #3 (ie): 0x%x+%d [import/export]\n", 330 ch->firsts[CHET_IE], 331 ch->counts[CHET_IE]); 332 vprintk("type #4 (dt): 0x%x+%d [data transfer]\n", 333 ch->firsts[CHET_DT], 334 ch->counts[CHET_DT]); 335 } else { 336 vprintk("reading element address assigment page failed!\n"); 337 } 338 339 /* vendor specific element types */ 340 for (i = 0; i < 4; i++) { 341 if (0 == vendor_counts[i]) 342 continue; 343 if (NULL == vendor_labels[i]) 344 continue; 345 ch->firsts[CHET_V1+i] = vendor_firsts[i]; 346 ch->counts[CHET_V1+i] = vendor_counts[i]; 347 vprintk("type #%d (v%d): 0x%x+%d [%s, vendor specific]\n", 348 i+5,i+1,vendor_firsts[i],vendor_counts[i], 349 vendor_labels[i]); 350 } 351 352 /* look up the devices of the data transfer elements */ 353 ch->dt = kmalloc(ch->counts[CHET_DT]*sizeof(struct scsi_device), 354 GFP_KERNEL); 355 for (elem = 0; elem < ch->counts[CHET_DT]; elem++) { 356 id = -1; 357 lun = 0; 358 if (elem < CH_DT_MAX && -1 != dt_id[elem]) { 359 id = dt_id[elem]; 360 lun = dt_lun[elem]; 361 vprintk("dt 0x%x: [insmod option] ", 362 elem+ch->firsts[CHET_DT]); 363 } else if (0 != ch_read_element_status 364 (ch,elem+ch->firsts[CHET_DT],data)) { 365 vprintk("dt 0x%x: READ ELEMENT STATUS failed\n", 366 elem+ch->firsts[CHET_DT]); 367 } else { 368 vprintk("dt 0x%x: ",elem+ch->firsts[CHET_DT]); 369 if (data[6] & 0x80) { 370 if (verbose) 371 printk("not this SCSI bus\n"); 372 ch->dt[elem] = NULL; 373 } else if (0 == (data[6] & 0x30)) { 374 if (verbose) 375 printk("ID/LUN unknown\n"); 376 ch->dt[elem] = NULL; 377 } else { 378 id = ch->device->id; 379 lun = 0; 380 if (data[6] & 0x20) id = data[7]; 381 if (data[6] & 0x10) lun = data[6] & 7; 382 } 383 } 384 if (-1 != id) { 385 if (verbose) 386 printk("ID %i, LUN %i, ",id,lun); 387 ch->dt[elem] = 388 scsi_device_lookup(ch->device->host, 389 ch->device->channel, 390 id,lun); 391 if (!ch->dt[elem]) { 392 /* should not happen */ 393 if (verbose) 394 printk("Huh? device not found!\n"); 395 } else { 396 if (verbose) 397 printk("name: %8.8s %16.16s %4.4s\n", 398 ch->dt[elem]->vendor, 399 ch->dt[elem]->model, 400 ch->dt[elem]->rev); 401 } 402 } 403 } 404 ch->voltags = 1; 405 kfree(buffer); 406 407 return 0; 408 } 409 410 /* ------------------------------------------------------------------------ */ 411 412 static int 413 ch_position(scsi_changer *ch, u_int trans, u_int elem, int rotate) 414 { 415 u_char cmd[10]; 416 417 dprintk("position: 0x%x\n",elem); 418 if (0 == trans) 419 trans = ch->firsts[CHET_MT]; 420 memset(cmd,0,sizeof(cmd)); 421 cmd[0] = POSITION_TO_ELEMENT; 422 cmd[1] = ch->device->lun << 5; 423 cmd[2] = (trans >> 8) & 0xff; 424 cmd[3] = trans & 0xff; 425 cmd[4] = (elem >> 8) & 0xff; 426 cmd[5] = elem & 0xff; 427 cmd[8] = rotate ? 1 : 0; 428 return ch_do_scsi(ch, cmd, NULL, 0, DMA_NONE); 429 } 430 431 static int 432 ch_move(scsi_changer *ch, u_int trans, u_int src, u_int dest, int rotate) 433 { 434 u_char cmd[12]; 435 436 dprintk("move: 0x%x => 0x%x\n",src,dest); 437 if (0 == trans) 438 trans = ch->firsts[CHET_MT]; 439 memset(cmd,0,sizeof(cmd)); 440 cmd[0] = MOVE_MEDIUM; 441 cmd[1] = ch->device->lun << 5; 442 cmd[2] = (trans >> 8) & 0xff; 443 cmd[3] = trans & 0xff; 444 cmd[4] = (src >> 8) & 0xff; 445 cmd[5] = src & 0xff; 446 cmd[6] = (dest >> 8) & 0xff; 447 cmd[7] = dest & 0xff; 448 cmd[10] = rotate ? 1 : 0; 449 return ch_do_scsi(ch, cmd, NULL,0, DMA_NONE); 450 } 451 452 static int 453 ch_exchange(scsi_changer *ch, u_int trans, u_int src, 454 u_int dest1, u_int dest2, int rotate1, int rotate2) 455 { 456 u_char cmd[12]; 457 458 dprintk("exchange: 0x%x => 0x%x => 0x%x\n", 459 src,dest1,dest2); 460 if (0 == trans) 461 trans = ch->firsts[CHET_MT]; 462 memset(cmd,0,sizeof(cmd)); 463 cmd[0] = EXCHANGE_MEDIUM; 464 cmd[1] = ch->device->lun << 5; 465 cmd[2] = (trans >> 8) & 0xff; 466 cmd[3] = trans & 0xff; 467 cmd[4] = (src >> 8) & 0xff; 468 cmd[5] = src & 0xff; 469 cmd[6] = (dest1 >> 8) & 0xff; 470 cmd[7] = dest1 & 0xff; 471 cmd[8] = (dest2 >> 8) & 0xff; 472 cmd[9] = dest2 & 0xff; 473 cmd[10] = (rotate1 ? 1 : 0) | (rotate2 ? 2 : 0); 474 475 return ch_do_scsi(ch, cmd, NULL,0, DMA_NONE); 476 } 477 478 static void 479 ch_check_voltag(char *tag) 480 { 481 int i; 482 483 for (i = 0; i < 32; i++) { 484 /* restrict to ascii */ 485 if (tag[i] >= 0x7f || tag[i] < 0x20) 486 tag[i] = ' '; 487 /* don't allow search wildcards */ 488 if (tag[i] == '?' || 489 tag[i] == '*') 490 tag[i] = ' '; 491 } 492 } 493 494 static int 495 ch_set_voltag(scsi_changer *ch, u_int elem, 496 int alternate, int clear, u_char *tag) 497 { 498 u_char cmd[12]; 499 u_char *buffer; 500 int result; 501 502 buffer = kzalloc(512, GFP_KERNEL); 503 if (!buffer) 504 return -ENOMEM; 505 506 dprintk("%s %s voltag: 0x%x => \"%s\"\n", 507 clear ? "clear" : "set", 508 alternate ? "alternate" : "primary", 509 elem, tag); 510 memset(cmd,0,sizeof(cmd)); 511 cmd[0] = SEND_VOLUME_TAG; 512 cmd[1] = (ch->device->lun << 5) | 513 ch_elem_to_typecode(ch,elem); 514 cmd[2] = (elem >> 8) & 0xff; 515 cmd[3] = elem & 0xff; 516 cmd[5] = clear 517 ? (alternate ? 0x0d : 0x0c) 518 : (alternate ? 0x0b : 0x0a); 519 520 cmd[9] = 255; 521 522 memcpy(buffer,tag,32); 523 ch_check_voltag(buffer); 524 525 result = ch_do_scsi(ch, cmd, buffer, 256, DMA_TO_DEVICE); 526 kfree(buffer); 527 return result; 528 } 529 530 static int ch_gstatus(scsi_changer *ch, int type, unsigned char __user *dest) 531 { 532 int retval = 0; 533 u_char data[16]; 534 unsigned int i; 535 536 mutex_lock(&ch->lock); 537 for (i = 0; i < ch->counts[type]; i++) { 538 if (0 != ch_read_element_status 539 (ch, ch->firsts[type]+i,data)) { 540 retval = -EIO; 541 break; 542 } 543 put_user(data[2], dest+i); 544 if (data[2] & CESTATUS_EXCEPT) 545 vprintk("element 0x%x: asc=0x%x, ascq=0x%x\n", 546 ch->firsts[type]+i, 547 (int)data[4],(int)data[5]); 548 retval = ch_read_element_status 549 (ch, ch->firsts[type]+i,data); 550 if (0 != retval) 551 break; 552 } 553 mutex_unlock(&ch->lock); 554 return retval; 555 } 556 557 /* ------------------------------------------------------------------------ */ 558 559 static int 560 ch_release(struct inode *inode, struct file *file) 561 { 562 scsi_changer *ch = file->private_data; 563 564 scsi_device_put(ch->device); 565 file->private_data = NULL; 566 return 0; 567 } 568 569 static int 570 ch_open(struct inode *inode, struct file *file) 571 { 572 scsi_changer *ch; 573 int minor = iminor(inode); 574 575 lock_kernel(); 576 spin_lock(&ch_index_lock); 577 ch = idr_find(&ch_index_idr, minor); 578 579 if (NULL == ch || scsi_device_get(ch->device)) { 580 spin_unlock(&ch_index_lock); 581 unlock_kernel(); 582 return -ENXIO; 583 } 584 spin_unlock(&ch_index_lock); 585 586 file->private_data = ch; 587 unlock_kernel(); 588 return 0; 589 } 590 591 static int 592 ch_checkrange(scsi_changer *ch, unsigned int type, unsigned int unit) 593 { 594 if (type >= CH_TYPES || unit >= ch->counts[type]) 595 return -1; 596 return 0; 597 } 598 599 static long ch_ioctl(struct file *file, 600 unsigned int cmd, unsigned long arg) 601 { 602 scsi_changer *ch = file->private_data; 603 int retval; 604 void __user *argp = (void __user *)arg; 605 606 switch (cmd) { 607 case CHIOGPARAMS: 608 { 609 struct changer_params params; 610 611 params.cp_curpicker = 0; 612 params.cp_npickers = ch->counts[CHET_MT]; 613 params.cp_nslots = ch->counts[CHET_ST]; 614 params.cp_nportals = ch->counts[CHET_IE]; 615 params.cp_ndrives = ch->counts[CHET_DT]; 616 617 if (copy_to_user(argp, ¶ms, sizeof(params))) 618 return -EFAULT; 619 return 0; 620 } 621 case CHIOGVPARAMS: 622 { 623 struct changer_vendor_params vparams; 624 625 memset(&vparams,0,sizeof(vparams)); 626 if (ch->counts[CHET_V1]) { 627 vparams.cvp_n1 = ch->counts[CHET_V1]; 628 strncpy(vparams.cvp_label1,vendor_labels[0],16); 629 } 630 if (ch->counts[CHET_V2]) { 631 vparams.cvp_n2 = ch->counts[CHET_V2]; 632 strncpy(vparams.cvp_label2,vendor_labels[1],16); 633 } 634 if (ch->counts[CHET_V3]) { 635 vparams.cvp_n3 = ch->counts[CHET_V3]; 636 strncpy(vparams.cvp_label3,vendor_labels[2],16); 637 } 638 if (ch->counts[CHET_V4]) { 639 vparams.cvp_n4 = ch->counts[CHET_V4]; 640 strncpy(vparams.cvp_label4,vendor_labels[3],16); 641 } 642 if (copy_to_user(argp, &vparams, sizeof(vparams))) 643 return -EFAULT; 644 return 0; 645 } 646 647 case CHIOPOSITION: 648 { 649 struct changer_position pos; 650 651 if (copy_from_user(&pos, argp, sizeof (pos))) 652 return -EFAULT; 653 654 if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) { 655 dprintk("CHIOPOSITION: invalid parameter\n"); 656 return -EBADSLT; 657 } 658 mutex_lock(&ch->lock); 659 retval = ch_position(ch,0, 660 ch->firsts[pos.cp_type] + pos.cp_unit, 661 pos.cp_flags & CP_INVERT); 662 mutex_unlock(&ch->lock); 663 return retval; 664 } 665 666 case CHIOMOVE: 667 { 668 struct changer_move mv; 669 670 if (copy_from_user(&mv, argp, sizeof (mv))) 671 return -EFAULT; 672 673 if (0 != ch_checkrange(ch, mv.cm_fromtype, mv.cm_fromunit) || 674 0 != ch_checkrange(ch, mv.cm_totype, mv.cm_tounit )) { 675 dprintk("CHIOMOVE: invalid parameter\n"); 676 return -EBADSLT; 677 } 678 679 mutex_lock(&ch->lock); 680 retval = ch_move(ch,0, 681 ch->firsts[mv.cm_fromtype] + mv.cm_fromunit, 682 ch->firsts[mv.cm_totype] + mv.cm_tounit, 683 mv.cm_flags & CM_INVERT); 684 mutex_unlock(&ch->lock); 685 return retval; 686 } 687 688 case CHIOEXCHANGE: 689 { 690 struct changer_exchange mv; 691 692 if (copy_from_user(&mv, argp, sizeof (mv))) 693 return -EFAULT; 694 695 if (0 != ch_checkrange(ch, mv.ce_srctype, mv.ce_srcunit ) || 696 0 != ch_checkrange(ch, mv.ce_fdsttype, mv.ce_fdstunit) || 697 0 != ch_checkrange(ch, mv.ce_sdsttype, mv.ce_sdstunit)) { 698 dprintk("CHIOEXCHANGE: invalid parameter\n"); 699 return -EBADSLT; 700 } 701 702 mutex_lock(&ch->lock); 703 retval = ch_exchange 704 (ch,0, 705 ch->firsts[mv.ce_srctype] + mv.ce_srcunit, 706 ch->firsts[mv.ce_fdsttype] + mv.ce_fdstunit, 707 ch->firsts[mv.ce_sdsttype] + mv.ce_sdstunit, 708 mv.ce_flags & CE_INVERT1, mv.ce_flags & CE_INVERT2); 709 mutex_unlock(&ch->lock); 710 return retval; 711 } 712 713 case CHIOGSTATUS: 714 { 715 struct changer_element_status ces; 716 717 if (copy_from_user(&ces, argp, sizeof (ces))) 718 return -EFAULT; 719 if (ces.ces_type < 0 || ces.ces_type >= CH_TYPES) 720 return -EINVAL; 721 722 return ch_gstatus(ch, ces.ces_type, ces.ces_data); 723 } 724 725 case CHIOGELEM: 726 { 727 struct changer_get_element cge; 728 u_char ch_cmd[12]; 729 u_char *buffer; 730 unsigned int elem; 731 int result,i; 732 733 if (copy_from_user(&cge, argp, sizeof (cge))) 734 return -EFAULT; 735 736 if (0 != ch_checkrange(ch, cge.cge_type, cge.cge_unit)) 737 return -EINVAL; 738 elem = ch->firsts[cge.cge_type] + cge.cge_unit; 739 740 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); 741 if (!buffer) 742 return -ENOMEM; 743 mutex_lock(&ch->lock); 744 745 voltag_retry: 746 memset(ch_cmd, 0, sizeof(ch_cmd)); 747 ch_cmd[0] = READ_ELEMENT_STATUS; 748 ch_cmd[1] = (ch->device->lun << 5) | 749 (ch->voltags ? 0x10 : 0) | 750 ch_elem_to_typecode(ch,elem); 751 ch_cmd[2] = (elem >> 8) & 0xff; 752 ch_cmd[3] = elem & 0xff; 753 ch_cmd[5] = 1; 754 ch_cmd[9] = 255; 755 756 result = ch_do_scsi(ch, ch_cmd, buffer, 256, DMA_FROM_DEVICE); 757 if (!result) { 758 cge.cge_status = buffer[18]; 759 cge.cge_flags = 0; 760 if (buffer[18] & CESTATUS_EXCEPT) { 761 cge.cge_errno = EIO; 762 } 763 if (buffer[25] & 0x80) { 764 cge.cge_flags |= CGE_SRC; 765 if (buffer[25] & 0x40) 766 cge.cge_flags |= CGE_INVERT; 767 elem = (buffer[26]<<8) | buffer[27]; 768 for (i = 0; i < 4; i++) { 769 if (elem >= ch->firsts[i] && 770 elem < ch->firsts[i] + ch->counts[i]) { 771 cge.cge_srctype = i; 772 cge.cge_srcunit = elem-ch->firsts[i]; 773 } 774 } 775 } 776 if ((buffer[22] & 0x30) == 0x30) { 777 cge.cge_flags |= CGE_IDLUN; 778 cge.cge_id = buffer[23]; 779 cge.cge_lun = buffer[22] & 7; 780 } 781 if (buffer[9] & 0x80) { 782 cge.cge_flags |= CGE_PVOLTAG; 783 memcpy(cge.cge_pvoltag,buffer+28,36); 784 } 785 if (buffer[9] & 0x40) { 786 cge.cge_flags |= CGE_AVOLTAG; 787 memcpy(cge.cge_avoltag,buffer+64,36); 788 } 789 } else if (ch->voltags) { 790 ch->voltags = 0; 791 vprintk("device has no volume tag support\n"); 792 goto voltag_retry; 793 } 794 kfree(buffer); 795 mutex_unlock(&ch->lock); 796 797 if (copy_to_user(argp, &cge, sizeof (cge))) 798 return -EFAULT; 799 return result; 800 } 801 802 case CHIOINITELEM: 803 { 804 mutex_lock(&ch->lock); 805 retval = ch_init_elem(ch); 806 mutex_unlock(&ch->lock); 807 return retval; 808 } 809 810 case CHIOSVOLTAG: 811 { 812 struct changer_set_voltag csv; 813 int elem; 814 815 if (copy_from_user(&csv, argp, sizeof(csv))) 816 return -EFAULT; 817 818 if (0 != ch_checkrange(ch, csv.csv_type, csv.csv_unit)) { 819 dprintk("CHIOSVOLTAG: invalid parameter\n"); 820 return -EBADSLT; 821 } 822 elem = ch->firsts[csv.csv_type] + csv.csv_unit; 823 mutex_lock(&ch->lock); 824 retval = ch_set_voltag(ch, elem, 825 csv.csv_flags & CSV_AVOLTAG, 826 csv.csv_flags & CSV_CLEARTAG, 827 csv.csv_voltag); 828 mutex_unlock(&ch->lock); 829 return retval; 830 } 831 832 default: 833 return scsi_ioctl(ch->device, cmd, argp); 834 835 } 836 } 837 838 #ifdef CONFIG_COMPAT 839 840 struct changer_element_status32 { 841 int ces_type; 842 compat_uptr_t ces_data; 843 }; 844 #define CHIOGSTATUS32 _IOW('c', 8,struct changer_element_status32) 845 846 static long ch_ioctl_compat(struct file * file, 847 unsigned int cmd, unsigned long arg) 848 { 849 scsi_changer *ch = file->private_data; 850 851 switch (cmd) { 852 case CHIOGPARAMS: 853 case CHIOGVPARAMS: 854 case CHIOPOSITION: 855 case CHIOMOVE: 856 case CHIOEXCHANGE: 857 case CHIOGELEM: 858 case CHIOINITELEM: 859 case CHIOSVOLTAG: 860 /* compatible */ 861 return ch_ioctl(file, cmd, arg); 862 case CHIOGSTATUS32: 863 { 864 struct changer_element_status32 ces32; 865 unsigned char __user *data; 866 867 if (copy_from_user(&ces32, (void __user *)arg, sizeof (ces32))) 868 return -EFAULT; 869 if (ces32.ces_type < 0 || ces32.ces_type >= CH_TYPES) 870 return -EINVAL; 871 872 data = compat_ptr(ces32.ces_data); 873 return ch_gstatus(ch, ces32.ces_type, data); 874 } 875 default: 876 // return scsi_ioctl_compat(ch->device, cmd, (void*)arg); 877 return -ENOIOCTLCMD; 878 879 } 880 } 881 #endif 882 883 /* ------------------------------------------------------------------------ */ 884 885 static int ch_probe(struct device *dev) 886 { 887 struct scsi_device *sd = to_scsi_device(dev); 888 struct device *class_dev; 889 int minor, ret = -ENOMEM; 890 scsi_changer *ch; 891 892 if (sd->type != TYPE_MEDIUM_CHANGER) 893 return -ENODEV; 894 895 ch = kzalloc(sizeof(*ch), GFP_KERNEL); 896 if (NULL == ch) 897 return -ENOMEM; 898 899 if (!idr_pre_get(&ch_index_idr, GFP_KERNEL)) 900 goto free_ch; 901 902 spin_lock(&ch_index_lock); 903 ret = idr_get_new(&ch_index_idr, ch, &minor); 904 spin_unlock(&ch_index_lock); 905 906 if (ret) 907 goto free_ch; 908 909 if (minor > CH_MAX_DEVS) { 910 ret = -ENODEV; 911 goto remove_idr; 912 } 913 914 ch->minor = minor; 915 sprintf(ch->name,"ch%d",ch->minor); 916 917 class_dev = device_create(ch_sysfs_class, dev, 918 MKDEV(SCSI_CHANGER_MAJOR, ch->minor), ch, 919 "s%s", ch->name); 920 if (IS_ERR(class_dev)) { 921 printk(KERN_WARNING "ch%d: device_create failed\n", 922 ch->minor); 923 ret = PTR_ERR(class_dev); 924 goto remove_idr; 925 } 926 927 mutex_init(&ch->lock); 928 ch->device = sd; 929 ch_readconfig(ch); 930 if (init) 931 ch_init_elem(ch); 932 933 dev_set_drvdata(dev, ch); 934 sdev_printk(KERN_INFO, sd, "Attached scsi changer %s\n", ch->name); 935 936 return 0; 937 remove_idr: 938 idr_remove(&ch_index_idr, minor); 939 free_ch: 940 kfree(ch); 941 return ret; 942 } 943 944 static int ch_remove(struct device *dev) 945 { 946 scsi_changer *ch = dev_get_drvdata(dev); 947 948 spin_lock(&ch_index_lock); 949 idr_remove(&ch_index_idr, ch->minor); 950 spin_unlock(&ch_index_lock); 951 952 device_destroy(ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR,ch->minor)); 953 kfree(ch->dt); 954 kfree(ch); 955 return 0; 956 } 957 958 static struct scsi_driver ch_template = { 959 .owner = THIS_MODULE, 960 .gendrv = { 961 .name = "ch", 962 .probe = ch_probe, 963 .remove = ch_remove, 964 }, 965 }; 966 967 static const struct file_operations changer_fops = { 968 .owner = THIS_MODULE, 969 .open = ch_open, 970 .release = ch_release, 971 .unlocked_ioctl = ch_ioctl, 972 #ifdef CONFIG_COMPAT 973 .compat_ioctl = ch_ioctl_compat, 974 #endif 975 }; 976 977 static int __init init_ch_module(void) 978 { 979 int rc; 980 981 printk(KERN_INFO "SCSI Media Changer driver v" VERSION " \n"); 982 ch_sysfs_class = class_create(THIS_MODULE, "scsi_changer"); 983 if (IS_ERR(ch_sysfs_class)) { 984 rc = PTR_ERR(ch_sysfs_class); 985 return rc; 986 } 987 rc = register_chrdev(SCSI_CHANGER_MAJOR,"ch",&changer_fops); 988 if (rc < 0) { 989 printk("Unable to get major %d for SCSI-Changer\n", 990 SCSI_CHANGER_MAJOR); 991 goto fail1; 992 } 993 rc = scsi_register_driver(&ch_template.gendrv); 994 if (rc < 0) 995 goto fail2; 996 return 0; 997 998 fail2: 999 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch"); 1000 fail1: 1001 class_destroy(ch_sysfs_class); 1002 return rc; 1003 } 1004 1005 static void __exit exit_ch_module(void) 1006 { 1007 scsi_unregister_driver(&ch_template.gendrv); 1008 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch"); 1009 class_destroy(ch_sysfs_class); 1010 idr_destroy(&ch_index_idr); 1011 } 1012 1013 module_init(init_ch_module); 1014 module_exit(exit_ch_module); 1015 1016 /* 1017 * Local variables: 1018 * c-basic-offset: 8 1019 * End: 1020 */ 1021