1 /* 2 * SCSI Media Changer device driver for Linux 2.6 3 * 4 * (c) 1996-2003 Gerd Knorr <kraxel@bytesex.org> 5 * 6 */ 7 8 #define VERSION "0.25" 9 10 #include <linux/module.h> 11 #include <linux/init.h> 12 #include <linux/fs.h> 13 #include <linux/kernel.h> 14 #include <linux/mm.h> 15 #include <linux/major.h> 16 #include <linux/string.h> 17 #include <linux/errno.h> 18 #include <linux/interrupt.h> 19 #include <linux/blkdev.h> 20 #include <linux/completion.h> 21 #include <linux/compat.h> 22 #include <linux/chio.h> /* here are all the ioctls */ 23 #include <linux/mutex.h> 24 #include <linux/idr.h> 25 #include <linux/slab.h> 26 27 #include <scsi/scsi.h> 28 #include <scsi/scsi_cmnd.h> 29 #include <scsi/scsi_driver.h> 30 #include <scsi/scsi_ioctl.h> 31 #include <scsi/scsi_host.h> 32 #include <scsi/scsi_device.h> 33 #include <scsi/scsi_eh.h> 34 #include <scsi/scsi_dbg.h> 35 36 #define CH_DT_MAX 16 37 #define CH_TYPES 8 38 #define CH_MAX_DEVS 128 39 40 MODULE_DESCRIPTION("device driver for scsi media changer devices"); 41 MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org>"); 42 MODULE_LICENSE("GPL"); 43 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_CHANGER_MAJOR); 44 MODULE_ALIAS_SCSI_DEVICE(TYPE_MEDIUM_CHANGER); 45 46 static DEFINE_MUTEX(ch_mutex); 47 static int init = 1; 48 module_param(init, int, 0444); 49 MODULE_PARM_DESC(init, \ 50 "initialize element status on driver load (default: on)"); 51 52 static int timeout_move = 300; 53 module_param(timeout_move, int, 0644); 54 MODULE_PARM_DESC(timeout_move,"timeout for move commands " 55 "(default: 300 seconds)"); 56 57 static int timeout_init = 3600; 58 module_param(timeout_init, int, 0644); 59 MODULE_PARM_DESC(timeout_init,"timeout for INITIALIZE ELEMENT STATUS " 60 "(default: 3600 seconds)"); 61 62 static int verbose = 1; 63 module_param(verbose, int, 0644); 64 MODULE_PARM_DESC(verbose,"be verbose (default: on)"); 65 66 static int debug = 0; 67 module_param(debug, int, 0644); 68 MODULE_PARM_DESC(debug,"enable/disable debug messages, also prints more " 69 "detailed sense codes on scsi errors (default: off)"); 70 71 static int dt_id[CH_DT_MAX] = { [ 0 ... (CH_DT_MAX-1) ] = -1 }; 72 static int dt_lun[CH_DT_MAX]; 73 module_param_array(dt_id, int, NULL, 0444); 74 module_param_array(dt_lun, int, NULL, 0444); 75 76 /* tell the driver about vendor-specific slots */ 77 static int vendor_firsts[CH_TYPES-4]; 78 static int vendor_counts[CH_TYPES-4]; 79 module_param_array(vendor_firsts, int, NULL, 0444); 80 module_param_array(vendor_counts, int, NULL, 0444); 81 82 static const char * vendor_labels[CH_TYPES-4] = { 83 "v0", "v1", "v2", "v3" 84 }; 85 // module_param_string_array(vendor_labels, NULL, 0444); 86 87 #define ch_printk(prefix, ch, fmt, a...) \ 88 sdev_prefix_printk(prefix, (ch)->device, (ch)->name, fmt, ##a) 89 90 #define DPRINTK(fmt, arg...) \ 91 do { \ 92 if (debug) \ 93 ch_printk(KERN_DEBUG, ch, fmt, ##arg); \ 94 } while (0) 95 #define VPRINTK(level, fmt, arg...) \ 96 do { \ 97 if (verbose) \ 98 ch_printk(level, ch, fmt, ##arg); \ 99 } while (0) 100 101 /* ------------------------------------------------------------------- */ 102 103 #define MAX_RETRIES 1 104 105 static struct class * ch_sysfs_class; 106 107 typedef struct { 108 struct list_head list; 109 int minor; 110 char name[8]; 111 struct scsi_device *device; 112 struct scsi_device **dt; /* ptrs to data transfer elements */ 113 u_int firsts[CH_TYPES]; 114 u_int counts[CH_TYPES]; 115 u_int unit_attention; 116 u_int voltags; 117 struct mutex lock; 118 } scsi_changer; 119 120 static DEFINE_IDR(ch_index_idr); 121 static DEFINE_SPINLOCK(ch_index_lock); 122 123 static const struct { 124 unsigned char sense; 125 unsigned char asc; 126 unsigned char ascq; 127 int errno; 128 } ch_err[] = { 129 /* Just filled in what looks right. Hav'nt checked any standard paper for 130 these errno assignments, so they may be wrong... */ 131 { 132 .sense = ILLEGAL_REQUEST, 133 .asc = 0x21, 134 .ascq = 0x01, 135 .errno = EBADSLT, /* Invalid element address */ 136 },{ 137 .sense = ILLEGAL_REQUEST, 138 .asc = 0x28, 139 .ascq = 0x01, 140 .errno = EBADE, /* Import or export element accessed */ 141 },{ 142 .sense = ILLEGAL_REQUEST, 143 .asc = 0x3B, 144 .ascq = 0x0D, 145 .errno = EXFULL, /* Medium destination element full */ 146 },{ 147 .sense = ILLEGAL_REQUEST, 148 .asc = 0x3B, 149 .ascq = 0x0E, 150 .errno = EBADE, /* Medium source element empty */ 151 },{ 152 .sense = ILLEGAL_REQUEST, 153 .asc = 0x20, 154 .ascq = 0x00, 155 .errno = EBADRQC, /* Invalid command operation code */ 156 },{ 157 /* end of list */ 158 } 159 }; 160 161 /* ------------------------------------------------------------------- */ 162 163 static int ch_find_errno(struct scsi_sense_hdr *sshdr) 164 { 165 int i,errno = 0; 166 167 /* Check to see if additional sense information is available */ 168 if (scsi_sense_valid(sshdr) && 169 sshdr->asc != 0) { 170 for (i = 0; ch_err[i].errno != 0; i++) { 171 if (ch_err[i].sense == sshdr->sense_key && 172 ch_err[i].asc == sshdr->asc && 173 ch_err[i].ascq == sshdr->ascq) { 174 errno = -ch_err[i].errno; 175 break; 176 } 177 } 178 } 179 if (errno == 0) 180 errno = -EIO; 181 return errno; 182 } 183 184 static int 185 ch_do_scsi(scsi_changer *ch, unsigned char *cmd, int cmd_len, 186 void *buffer, unsigned buflength, 187 enum dma_data_direction direction) 188 { 189 int errno, retries = 0, timeout, result; 190 struct scsi_sense_hdr sshdr; 191 192 timeout = (cmd[0] == INITIALIZE_ELEMENT_STATUS) 193 ? timeout_init : timeout_move; 194 195 retry: 196 errno = 0; 197 result = scsi_execute_req(ch->device, cmd, direction, buffer, 198 buflength, &sshdr, timeout * HZ, 199 MAX_RETRIES, NULL); 200 201 if (driver_byte(result) & DRIVER_SENSE) { 202 if (debug) 203 scsi_print_sense_hdr(ch->device, ch->name, &sshdr); 204 errno = ch_find_errno(&sshdr); 205 206 switch(sshdr.sense_key) { 207 case UNIT_ATTENTION: 208 ch->unit_attention = 1; 209 if (retries++ < 3) 210 goto retry; 211 break; 212 } 213 } 214 return errno; 215 } 216 217 /* ------------------------------------------------------------------------ */ 218 219 static int 220 ch_elem_to_typecode(scsi_changer *ch, u_int elem) 221 { 222 int i; 223 224 for (i = 0; i < CH_TYPES; i++) { 225 if (elem >= ch->firsts[i] && 226 elem < ch->firsts[i] + 227 ch->counts[i]) 228 return i+1; 229 } 230 return 0; 231 } 232 233 static int 234 ch_read_element_status(scsi_changer *ch, u_int elem, char *data) 235 { 236 u_char cmd[12]; 237 u_char *buffer; 238 int result; 239 240 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); 241 if(!buffer) 242 return -ENOMEM; 243 244 retry: 245 memset(cmd,0,sizeof(cmd)); 246 cmd[0] = READ_ELEMENT_STATUS; 247 cmd[1] = ((ch->device->lun & 0x7) << 5) | 248 (ch->voltags ? 0x10 : 0) | 249 ch_elem_to_typecode(ch,elem); 250 cmd[2] = (elem >> 8) & 0xff; 251 cmd[3] = elem & 0xff; 252 cmd[5] = 1; 253 cmd[9] = 255; 254 if (0 == (result = ch_do_scsi(ch, cmd, 12, 255 buffer, 256, DMA_FROM_DEVICE))) { 256 if (((buffer[16] << 8) | buffer[17]) != elem) { 257 DPRINTK("asked for element 0x%02x, got 0x%02x\n", 258 elem,(buffer[16] << 8) | buffer[17]); 259 kfree(buffer); 260 return -EIO; 261 } 262 memcpy(data,buffer+16,16); 263 } else { 264 if (ch->voltags) { 265 ch->voltags = 0; 266 VPRINTK(KERN_INFO, "device has no volume tag support\n"); 267 goto retry; 268 } 269 DPRINTK("READ ELEMENT STATUS for element 0x%x failed\n",elem); 270 } 271 kfree(buffer); 272 return result; 273 } 274 275 static int 276 ch_init_elem(scsi_changer *ch) 277 { 278 int err; 279 u_char cmd[6]; 280 281 VPRINTK(KERN_INFO, "INITIALIZE ELEMENT STATUS, may take some time ...\n"); 282 memset(cmd,0,sizeof(cmd)); 283 cmd[0] = INITIALIZE_ELEMENT_STATUS; 284 cmd[1] = (ch->device->lun & 0x7) << 5; 285 err = ch_do_scsi(ch, cmd, 6, NULL, 0, DMA_NONE); 286 VPRINTK(KERN_INFO, "... finished\n"); 287 return err; 288 } 289 290 static int 291 ch_readconfig(scsi_changer *ch) 292 { 293 u_char cmd[10], data[16]; 294 u_char *buffer; 295 int result,id,lun,i; 296 u_int elem; 297 298 buffer = kzalloc(512, GFP_KERNEL | GFP_DMA); 299 if (!buffer) 300 return -ENOMEM; 301 302 memset(cmd,0,sizeof(cmd)); 303 cmd[0] = MODE_SENSE; 304 cmd[1] = (ch->device->lun & 0x7) << 5; 305 cmd[2] = 0x1d; 306 cmd[4] = 255; 307 result = ch_do_scsi(ch, cmd, 10, buffer, 255, DMA_FROM_DEVICE); 308 if (0 != result) { 309 cmd[1] |= (1<<3); 310 result = ch_do_scsi(ch, cmd, 10, buffer, 255, DMA_FROM_DEVICE); 311 } 312 if (0 == result) { 313 ch->firsts[CHET_MT] = 314 (buffer[buffer[3]+ 6] << 8) | buffer[buffer[3]+ 7]; 315 ch->counts[CHET_MT] = 316 (buffer[buffer[3]+ 8] << 8) | buffer[buffer[3]+ 9]; 317 ch->firsts[CHET_ST] = 318 (buffer[buffer[3]+10] << 8) | buffer[buffer[3]+11]; 319 ch->counts[CHET_ST] = 320 (buffer[buffer[3]+12] << 8) | buffer[buffer[3]+13]; 321 ch->firsts[CHET_IE] = 322 (buffer[buffer[3]+14] << 8) | buffer[buffer[3]+15]; 323 ch->counts[CHET_IE] = 324 (buffer[buffer[3]+16] << 8) | buffer[buffer[3]+17]; 325 ch->firsts[CHET_DT] = 326 (buffer[buffer[3]+18] << 8) | buffer[buffer[3]+19]; 327 ch->counts[CHET_DT] = 328 (buffer[buffer[3]+20] << 8) | buffer[buffer[3]+21]; 329 VPRINTK(KERN_INFO, "type #1 (mt): 0x%x+%d [medium transport]\n", 330 ch->firsts[CHET_MT], 331 ch->counts[CHET_MT]); 332 VPRINTK(KERN_INFO, "type #2 (st): 0x%x+%d [storage]\n", 333 ch->firsts[CHET_ST], 334 ch->counts[CHET_ST]); 335 VPRINTK(KERN_INFO, "type #3 (ie): 0x%x+%d [import/export]\n", 336 ch->firsts[CHET_IE], 337 ch->counts[CHET_IE]); 338 VPRINTK(KERN_INFO, "type #4 (dt): 0x%x+%d [data transfer]\n", 339 ch->firsts[CHET_DT], 340 ch->counts[CHET_DT]); 341 } else { 342 VPRINTK(KERN_INFO, "reading element address assignment page failed!\n"); 343 } 344 345 /* vendor specific element types */ 346 for (i = 0; i < 4; i++) { 347 if (0 == vendor_counts[i]) 348 continue; 349 if (NULL == vendor_labels[i]) 350 continue; 351 ch->firsts[CHET_V1+i] = vendor_firsts[i]; 352 ch->counts[CHET_V1+i] = vendor_counts[i]; 353 VPRINTK(KERN_INFO, "type #%d (v%d): 0x%x+%d [%s, vendor specific]\n", 354 i+5,i+1,vendor_firsts[i],vendor_counts[i], 355 vendor_labels[i]); 356 } 357 358 /* look up the devices of the data transfer elements */ 359 ch->dt = kcalloc(ch->counts[CHET_DT], sizeof(*ch->dt), 360 GFP_KERNEL); 361 362 if (!ch->dt) { 363 kfree(buffer); 364 return -ENOMEM; 365 } 366 367 for (elem = 0; elem < ch->counts[CHET_DT]; elem++) { 368 id = -1; 369 lun = 0; 370 if (elem < CH_DT_MAX && -1 != dt_id[elem]) { 371 id = dt_id[elem]; 372 lun = dt_lun[elem]; 373 VPRINTK(KERN_INFO, "dt 0x%x: [insmod option] ", 374 elem+ch->firsts[CHET_DT]); 375 } else if (0 != ch_read_element_status 376 (ch,elem+ch->firsts[CHET_DT],data)) { 377 VPRINTK(KERN_INFO, "dt 0x%x: READ ELEMENT STATUS failed\n", 378 elem+ch->firsts[CHET_DT]); 379 } else { 380 VPRINTK(KERN_INFO, "dt 0x%x: ",elem+ch->firsts[CHET_DT]); 381 if (data[6] & 0x80) { 382 VPRINTK(KERN_CONT, "not this SCSI bus\n"); 383 ch->dt[elem] = NULL; 384 } else if (0 == (data[6] & 0x30)) { 385 VPRINTK(KERN_CONT, "ID/LUN unknown\n"); 386 ch->dt[elem] = NULL; 387 } else { 388 id = ch->device->id; 389 lun = 0; 390 if (data[6] & 0x20) id = data[7]; 391 if (data[6] & 0x10) lun = data[6] & 7; 392 } 393 } 394 if (-1 != id) { 395 VPRINTK(KERN_CONT, "ID %i, LUN %i, ",id,lun); 396 ch->dt[elem] = 397 scsi_device_lookup(ch->device->host, 398 ch->device->channel, 399 id,lun); 400 if (!ch->dt[elem]) { 401 /* should not happen */ 402 VPRINTK(KERN_CONT, "Huh? device not found!\n"); 403 } else { 404 VPRINTK(KERN_CONT, "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 & 0x7) << 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, 10, 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 & 0x7) << 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, 12, 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 & 0x7) << 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, 12, 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 & 0x7) << 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, 12, 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(KERN_INFO, "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 mutex_lock(&ch_mutex); 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 mutex_unlock(&ch_mutex); 589 return -ENXIO; 590 } 591 spin_unlock(&ch_index_lock); 592 593 file->private_data = ch; 594 mutex_unlock(&ch_mutex); 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 retval = scsi_ioctl_block_when_processing_errors(ch->device, cmd, 614 file->f_flags & O_NDELAY); 615 if (retval) 616 return retval; 617 618 switch (cmd) { 619 case CHIOGPARAMS: 620 { 621 struct changer_params params; 622 623 params.cp_curpicker = 0; 624 params.cp_npickers = ch->counts[CHET_MT]; 625 params.cp_nslots = ch->counts[CHET_ST]; 626 params.cp_nportals = ch->counts[CHET_IE]; 627 params.cp_ndrives = ch->counts[CHET_DT]; 628 629 if (copy_to_user(argp, ¶ms, sizeof(params))) 630 return -EFAULT; 631 return 0; 632 } 633 case CHIOGVPARAMS: 634 { 635 struct changer_vendor_params vparams; 636 637 memset(&vparams,0,sizeof(vparams)); 638 if (ch->counts[CHET_V1]) { 639 vparams.cvp_n1 = ch->counts[CHET_V1]; 640 strncpy(vparams.cvp_label1,vendor_labels[0],16); 641 } 642 if (ch->counts[CHET_V2]) { 643 vparams.cvp_n2 = ch->counts[CHET_V2]; 644 strncpy(vparams.cvp_label2,vendor_labels[1],16); 645 } 646 if (ch->counts[CHET_V3]) { 647 vparams.cvp_n3 = ch->counts[CHET_V3]; 648 strncpy(vparams.cvp_label3,vendor_labels[2],16); 649 } 650 if (ch->counts[CHET_V4]) { 651 vparams.cvp_n4 = ch->counts[CHET_V4]; 652 strncpy(vparams.cvp_label4,vendor_labels[3],16); 653 } 654 if (copy_to_user(argp, &vparams, sizeof(vparams))) 655 return -EFAULT; 656 return 0; 657 } 658 659 case CHIOPOSITION: 660 { 661 struct changer_position pos; 662 663 if (copy_from_user(&pos, argp, sizeof (pos))) 664 return -EFAULT; 665 666 if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) { 667 DPRINTK("CHIOPOSITION: invalid parameter\n"); 668 return -EBADSLT; 669 } 670 mutex_lock(&ch->lock); 671 retval = ch_position(ch,0, 672 ch->firsts[pos.cp_type] + pos.cp_unit, 673 pos.cp_flags & CP_INVERT); 674 mutex_unlock(&ch->lock); 675 return retval; 676 } 677 678 case CHIOMOVE: 679 { 680 struct changer_move mv; 681 682 if (copy_from_user(&mv, argp, sizeof (mv))) 683 return -EFAULT; 684 685 if (0 != ch_checkrange(ch, mv.cm_fromtype, mv.cm_fromunit) || 686 0 != ch_checkrange(ch, mv.cm_totype, mv.cm_tounit )) { 687 DPRINTK("CHIOMOVE: invalid parameter\n"); 688 return -EBADSLT; 689 } 690 691 mutex_lock(&ch->lock); 692 retval = ch_move(ch,0, 693 ch->firsts[mv.cm_fromtype] + mv.cm_fromunit, 694 ch->firsts[mv.cm_totype] + mv.cm_tounit, 695 mv.cm_flags & CM_INVERT); 696 mutex_unlock(&ch->lock); 697 return retval; 698 } 699 700 case CHIOEXCHANGE: 701 { 702 struct changer_exchange mv; 703 704 if (copy_from_user(&mv, argp, sizeof (mv))) 705 return -EFAULT; 706 707 if (0 != ch_checkrange(ch, mv.ce_srctype, mv.ce_srcunit ) || 708 0 != ch_checkrange(ch, mv.ce_fdsttype, mv.ce_fdstunit) || 709 0 != ch_checkrange(ch, mv.ce_sdsttype, mv.ce_sdstunit)) { 710 DPRINTK("CHIOEXCHANGE: invalid parameter\n"); 711 return -EBADSLT; 712 } 713 714 mutex_lock(&ch->lock); 715 retval = ch_exchange 716 (ch,0, 717 ch->firsts[mv.ce_srctype] + mv.ce_srcunit, 718 ch->firsts[mv.ce_fdsttype] + mv.ce_fdstunit, 719 ch->firsts[mv.ce_sdsttype] + mv.ce_sdstunit, 720 mv.ce_flags & CE_INVERT1, mv.ce_flags & CE_INVERT2); 721 mutex_unlock(&ch->lock); 722 return retval; 723 } 724 725 case CHIOGSTATUS: 726 { 727 struct changer_element_status ces; 728 729 if (copy_from_user(&ces, argp, sizeof (ces))) 730 return -EFAULT; 731 if (ces.ces_type < 0 || ces.ces_type >= CH_TYPES) 732 return -EINVAL; 733 734 return ch_gstatus(ch, ces.ces_type, ces.ces_data); 735 } 736 737 case CHIOGELEM: 738 { 739 struct changer_get_element cge; 740 u_char ch_cmd[12]; 741 u_char *buffer; 742 unsigned int elem; 743 int result,i; 744 745 if (copy_from_user(&cge, argp, sizeof (cge))) 746 return -EFAULT; 747 748 if (0 != ch_checkrange(ch, cge.cge_type, cge.cge_unit)) 749 return -EINVAL; 750 elem = ch->firsts[cge.cge_type] + cge.cge_unit; 751 752 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); 753 if (!buffer) 754 return -ENOMEM; 755 mutex_lock(&ch->lock); 756 757 voltag_retry: 758 memset(ch_cmd, 0, sizeof(ch_cmd)); 759 ch_cmd[0] = READ_ELEMENT_STATUS; 760 ch_cmd[1] = ((ch->device->lun & 0x7) << 5) | 761 (ch->voltags ? 0x10 : 0) | 762 ch_elem_to_typecode(ch,elem); 763 ch_cmd[2] = (elem >> 8) & 0xff; 764 ch_cmd[3] = elem & 0xff; 765 ch_cmd[5] = 1; 766 ch_cmd[9] = 255; 767 768 result = ch_do_scsi(ch, ch_cmd, 12, 769 buffer, 256, DMA_FROM_DEVICE); 770 if (!result) { 771 cge.cge_status = buffer[18]; 772 cge.cge_flags = 0; 773 if (buffer[18] & CESTATUS_EXCEPT) { 774 cge.cge_errno = EIO; 775 } 776 if (buffer[25] & 0x80) { 777 cge.cge_flags |= CGE_SRC; 778 if (buffer[25] & 0x40) 779 cge.cge_flags |= CGE_INVERT; 780 elem = (buffer[26]<<8) | buffer[27]; 781 for (i = 0; i < 4; i++) { 782 if (elem >= ch->firsts[i] && 783 elem < ch->firsts[i] + ch->counts[i]) { 784 cge.cge_srctype = i; 785 cge.cge_srcunit = elem-ch->firsts[i]; 786 } 787 } 788 } 789 if ((buffer[22] & 0x30) == 0x30) { 790 cge.cge_flags |= CGE_IDLUN; 791 cge.cge_id = buffer[23]; 792 cge.cge_lun = buffer[22] & 7; 793 } 794 if (buffer[9] & 0x80) { 795 cge.cge_flags |= CGE_PVOLTAG; 796 memcpy(cge.cge_pvoltag,buffer+28,36); 797 } 798 if (buffer[9] & 0x40) { 799 cge.cge_flags |= CGE_AVOLTAG; 800 memcpy(cge.cge_avoltag,buffer+64,36); 801 } 802 } else if (ch->voltags) { 803 ch->voltags = 0; 804 VPRINTK(KERN_INFO, "device has no volume tag support\n"); 805 goto voltag_retry; 806 } 807 kfree(buffer); 808 mutex_unlock(&ch->lock); 809 810 if (copy_to_user(argp, &cge, sizeof (cge))) 811 return -EFAULT; 812 return result; 813 } 814 815 case CHIOINITELEM: 816 { 817 mutex_lock(&ch->lock); 818 retval = ch_init_elem(ch); 819 mutex_unlock(&ch->lock); 820 return retval; 821 } 822 823 case CHIOSVOLTAG: 824 { 825 struct changer_set_voltag csv; 826 int elem; 827 828 if (copy_from_user(&csv, argp, sizeof(csv))) 829 return -EFAULT; 830 831 if (0 != ch_checkrange(ch, csv.csv_type, csv.csv_unit)) { 832 DPRINTK("CHIOSVOLTAG: invalid parameter\n"); 833 return -EBADSLT; 834 } 835 elem = ch->firsts[csv.csv_type] + csv.csv_unit; 836 mutex_lock(&ch->lock); 837 retval = ch_set_voltag(ch, elem, 838 csv.csv_flags & CSV_AVOLTAG, 839 csv.csv_flags & CSV_CLEARTAG, 840 csv.csv_voltag); 841 mutex_unlock(&ch->lock); 842 return retval; 843 } 844 845 default: 846 return scsi_ioctl(ch->device, cmd, argp); 847 848 } 849 } 850 851 #ifdef CONFIG_COMPAT 852 853 struct changer_element_status32 { 854 int ces_type; 855 compat_uptr_t ces_data; 856 }; 857 #define CHIOGSTATUS32 _IOW('c', 8,struct changer_element_status32) 858 859 static long ch_ioctl_compat(struct file * file, 860 unsigned int cmd, unsigned long arg) 861 { 862 scsi_changer *ch = file->private_data; 863 864 switch (cmd) { 865 case CHIOGPARAMS: 866 case CHIOGVPARAMS: 867 case CHIOPOSITION: 868 case CHIOMOVE: 869 case CHIOEXCHANGE: 870 case CHIOGELEM: 871 case CHIOINITELEM: 872 case CHIOSVOLTAG: 873 /* compatible */ 874 return ch_ioctl(file, cmd, arg); 875 case CHIOGSTATUS32: 876 { 877 struct changer_element_status32 ces32; 878 unsigned char __user *data; 879 880 if (copy_from_user(&ces32, (void __user *)arg, sizeof (ces32))) 881 return -EFAULT; 882 if (ces32.ces_type < 0 || ces32.ces_type >= CH_TYPES) 883 return -EINVAL; 884 885 data = compat_ptr(ces32.ces_data); 886 return ch_gstatus(ch, ces32.ces_type, data); 887 } 888 default: 889 // return scsi_ioctl_compat(ch->device, cmd, (void*)arg); 890 return -ENOIOCTLCMD; 891 892 } 893 } 894 #endif 895 896 /* ------------------------------------------------------------------------ */ 897 898 static int ch_probe(struct device *dev) 899 { 900 struct scsi_device *sd = to_scsi_device(dev); 901 struct device *class_dev; 902 int ret; 903 scsi_changer *ch; 904 905 if (sd->type != TYPE_MEDIUM_CHANGER) 906 return -ENODEV; 907 908 ch = kzalloc(sizeof(*ch), GFP_KERNEL); 909 if (NULL == ch) 910 return -ENOMEM; 911 912 idr_preload(GFP_KERNEL); 913 spin_lock(&ch_index_lock); 914 ret = idr_alloc(&ch_index_idr, ch, 0, CH_MAX_DEVS + 1, GFP_NOWAIT); 915 spin_unlock(&ch_index_lock); 916 idr_preload_end(); 917 918 if (ret < 0) { 919 if (ret == -ENOSPC) 920 ret = -ENODEV; 921 goto free_ch; 922 } 923 924 ch->minor = ret; 925 sprintf(ch->name,"ch%d",ch->minor); 926 927 class_dev = device_create(ch_sysfs_class, dev, 928 MKDEV(SCSI_CHANGER_MAJOR, ch->minor), ch, 929 "s%s", ch->name); 930 if (IS_ERR(class_dev)) { 931 sdev_printk(KERN_WARNING, sd, "ch%d: device_create failed\n", 932 ch->minor); 933 ret = PTR_ERR(class_dev); 934 goto remove_idr; 935 } 936 937 mutex_init(&ch->lock); 938 ch->device = sd; 939 ch_readconfig(ch); 940 if (init) 941 ch_init_elem(ch); 942 943 dev_set_drvdata(dev, ch); 944 sdev_printk(KERN_INFO, sd, "Attached scsi changer %s\n", ch->name); 945 946 return 0; 947 remove_idr: 948 idr_remove(&ch_index_idr, ch->minor); 949 free_ch: 950 kfree(ch); 951 return ret; 952 } 953 954 static int ch_remove(struct device *dev) 955 { 956 scsi_changer *ch = dev_get_drvdata(dev); 957 958 spin_lock(&ch_index_lock); 959 idr_remove(&ch_index_idr, ch->minor); 960 spin_unlock(&ch_index_lock); 961 962 device_destroy(ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR,ch->minor)); 963 kfree(ch->dt); 964 kfree(ch); 965 return 0; 966 } 967 968 static struct scsi_driver ch_template = { 969 .gendrv = { 970 .name = "ch", 971 .owner = THIS_MODULE, 972 .probe = ch_probe, 973 .remove = ch_remove, 974 }, 975 }; 976 977 static const struct file_operations changer_fops = { 978 .owner = THIS_MODULE, 979 .open = ch_open, 980 .release = ch_release, 981 .unlocked_ioctl = ch_ioctl, 982 #ifdef CONFIG_COMPAT 983 .compat_ioctl = ch_ioctl_compat, 984 #endif 985 .llseek = noop_llseek, 986 }; 987 988 static int __init init_ch_module(void) 989 { 990 int rc; 991 992 printk(KERN_INFO "SCSI Media Changer driver v" VERSION " \n"); 993 ch_sysfs_class = class_create(THIS_MODULE, "scsi_changer"); 994 if (IS_ERR(ch_sysfs_class)) { 995 rc = PTR_ERR(ch_sysfs_class); 996 return rc; 997 } 998 rc = register_chrdev(SCSI_CHANGER_MAJOR,"ch",&changer_fops); 999 if (rc < 0) { 1000 printk("Unable to get major %d for SCSI-Changer\n", 1001 SCSI_CHANGER_MAJOR); 1002 goto fail1; 1003 } 1004 rc = scsi_register_driver(&ch_template.gendrv); 1005 if (rc < 0) 1006 goto fail2; 1007 return 0; 1008 1009 fail2: 1010 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch"); 1011 fail1: 1012 class_destroy(ch_sysfs_class); 1013 return rc; 1014 } 1015 1016 static void __exit exit_ch_module(void) 1017 { 1018 scsi_unregister_driver(&ch_template.gendrv); 1019 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch"); 1020 class_destroy(ch_sysfs_class); 1021 idr_destroy(&ch_index_idr); 1022 } 1023 1024 module_init(init_ch_module); 1025 module_exit(exit_ch_module); 1026 1027 /* 1028 * Local variables: 1029 * c-basic-offset: 8 1030 * End: 1031 */ 1032