1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * SCSI Media Changer device driver for Linux 2.6 4 * 5 * (c) 1996-2003 Gerd Knorr <kraxel@bytesex.org> 6 * 7 */ 8 9 #define VERSION "0.25" 10 11 #include <linux/module.h> 12 #include <linux/init.h> 13 #include <linux/fs.h> 14 #include <linux/kernel.h> 15 #include <linux/mm.h> 16 #include <linux/major.h> 17 #include <linux/string.h> 18 #include <linux/errno.h> 19 #include <linux/interrupt.h> 20 #include <linux/blkdev.h> 21 #include <linux/completion.h> 22 #include <linux/compat.h> 23 #include <linux/chio.h> /* here are all the ioctls */ 24 #include <linux/mutex.h> 25 #include <linux/idr.h> 26 #include <linux/slab.h> 27 28 #include <scsi/scsi.h> 29 #include <scsi/scsi_cmnd.h> 30 #include <scsi/scsi_driver.h> 31 #include <scsi/scsi_ioctl.h> 32 #include <scsi/scsi_host.h> 33 #include <scsi/scsi_device.h> 34 #include <scsi/scsi_eh.h> 35 #include <scsi/scsi_dbg.h> 36 37 #define CH_DT_MAX 16 38 #define CH_TYPES 8 39 #define CH_MAX_DEVS 128 40 41 MODULE_DESCRIPTION("device driver for scsi media changer devices"); 42 MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org>"); 43 MODULE_LICENSE("GPL"); 44 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_CHANGER_MAJOR); 45 MODULE_ALIAS_SCSI_DEVICE(TYPE_MEDIUM_CHANGER); 46 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; 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 kref ref; 109 struct list_head list; 110 int minor; 111 char name[8]; 112 struct scsi_device *device; 113 struct scsi_device **dt; /* ptrs to data transfer elements */ 114 u_int firsts[CH_TYPES]; 115 u_int counts[CH_TYPES]; 116 u_int unit_attention; 117 u_int voltags; 118 struct mutex lock; 119 } scsi_changer; 120 121 static DEFINE_IDR(ch_index_idr); 122 static DEFINE_SPINLOCK(ch_index_lock); 123 124 static const struct { 125 unsigned char sense; 126 unsigned char asc; 127 unsigned char ascq; 128 int errno; 129 } ch_err[] = { 130 /* Just filled in what looks right. Hav'nt checked any standard paper for 131 these errno assignments, so they may be wrong... */ 132 { 133 .sense = ILLEGAL_REQUEST, 134 .asc = 0x21, 135 .ascq = 0x01, 136 .errno = EBADSLT, /* Invalid element address */ 137 },{ 138 .sense = ILLEGAL_REQUEST, 139 .asc = 0x28, 140 .ascq = 0x01, 141 .errno = EBADE, /* Import or export element accessed */ 142 },{ 143 .sense = ILLEGAL_REQUEST, 144 .asc = 0x3B, 145 .ascq = 0x0D, 146 .errno = EXFULL, /* Medium destination element full */ 147 },{ 148 .sense = ILLEGAL_REQUEST, 149 .asc = 0x3B, 150 .ascq = 0x0E, 151 .errno = EBADE, /* Medium source element empty */ 152 },{ 153 .sense = ILLEGAL_REQUEST, 154 .asc = 0x20, 155 .ascq = 0x00, 156 .errno = EBADRQC, /* Invalid command operation code */ 157 },{ 158 /* end of list */ 159 } 160 }; 161 162 /* ------------------------------------------------------------------- */ 163 ch_find_errno(struct scsi_sense_hdr * sshdr)164 static int ch_find_errno(struct scsi_sense_hdr *sshdr) 165 { 166 int i,errno = 0; 167 168 /* Check to see if additional sense information is available */ 169 if (scsi_sense_valid(sshdr) && 170 sshdr->asc != 0) { 171 for (i = 0; ch_err[i].errno != 0; i++) { 172 if (ch_err[i].sense == sshdr->sense_key && 173 ch_err[i].asc == sshdr->asc && 174 ch_err[i].ascq == sshdr->ascq) { 175 errno = -ch_err[i].errno; 176 break; 177 } 178 } 179 } 180 if (errno == 0) 181 errno = -EIO; 182 return errno; 183 } 184 185 static int ch_do_scsi(scsi_changer * ch,unsigned char * cmd,int cmd_len,void * buffer,unsigned int buflength,enum req_op op)186 ch_do_scsi(scsi_changer *ch, unsigned char *cmd, int cmd_len, 187 void *buffer, unsigned int buflength, enum req_op op) 188 { 189 int errno, retries = 0, timeout, result; 190 struct scsi_sense_hdr sshdr; 191 const struct scsi_exec_args exec_args = { 192 .sshdr = &sshdr, 193 }; 194 195 timeout = (cmd[0] == INITIALIZE_ELEMENT_STATUS) 196 ? timeout_init : timeout_move; 197 198 retry: 199 errno = 0; 200 result = scsi_execute_cmd(ch->device, cmd, op, buffer, buflength, 201 timeout * HZ, MAX_RETRIES, &exec_args); 202 if (result < 0) 203 return result; 204 if (scsi_sense_valid(&sshdr)) { 205 if (debug) 206 scsi_print_sense_hdr(ch->device, ch->name, &sshdr); 207 errno = ch_find_errno(&sshdr); 208 209 switch(sshdr.sense_key) { 210 case UNIT_ATTENTION: 211 ch->unit_attention = 1; 212 if (retries++ < 3) 213 goto retry; 214 break; 215 } 216 } 217 return errno; 218 } 219 220 /* ------------------------------------------------------------------------ */ 221 222 static int ch_elem_to_typecode(scsi_changer * ch,u_int elem)223 ch_elem_to_typecode(scsi_changer *ch, u_int elem) 224 { 225 int i; 226 227 for (i = 0; i < CH_TYPES; i++) { 228 if (elem >= ch->firsts[i] && 229 elem < ch->firsts[i] + 230 ch->counts[i]) 231 return i+1; 232 } 233 return 0; 234 } 235 236 static int ch_read_element_status(scsi_changer * ch,u_int elem,char * data)237 ch_read_element_status(scsi_changer *ch, u_int elem, char *data) 238 { 239 u_char cmd[12]; 240 u_char *buffer; 241 int result; 242 243 buffer = kmalloc(512, GFP_KERNEL); 244 if(!buffer) 245 return -ENOMEM; 246 247 retry: 248 memset(cmd,0,sizeof(cmd)); 249 cmd[0] = READ_ELEMENT_STATUS; 250 cmd[1] = ((ch->device->lun & 0x7) << 5) | 251 (ch->voltags ? 0x10 : 0) | 252 ch_elem_to_typecode(ch,elem); 253 cmd[2] = (elem >> 8) & 0xff; 254 cmd[3] = elem & 0xff; 255 cmd[5] = 1; 256 cmd[9] = 255; 257 if (0 == (result = ch_do_scsi(ch, cmd, 12, 258 buffer, 256, REQ_OP_DRV_IN))) { 259 if (((buffer[16] << 8) | buffer[17]) != elem) { 260 DPRINTK("asked for element 0x%02x, got 0x%02x\n", 261 elem,(buffer[16] << 8) | buffer[17]); 262 kfree(buffer); 263 return -EIO; 264 } 265 memcpy(data,buffer+16,16); 266 } else { 267 if (ch->voltags) { 268 ch->voltags = 0; 269 VPRINTK(KERN_INFO, "device has no volume tag support\n"); 270 goto retry; 271 } 272 DPRINTK("READ ELEMENT STATUS for element 0x%x failed\n",elem); 273 } 274 kfree(buffer); 275 return result; 276 } 277 278 static int ch_init_elem(scsi_changer * ch)279 ch_init_elem(scsi_changer *ch) 280 { 281 int err; 282 u_char cmd[6]; 283 284 VPRINTK(KERN_INFO, "INITIALIZE ELEMENT STATUS, may take some time ...\n"); 285 memset(cmd,0,sizeof(cmd)); 286 cmd[0] = INITIALIZE_ELEMENT_STATUS; 287 cmd[1] = (ch->device->lun & 0x7) << 5; 288 err = ch_do_scsi(ch, cmd, 6, NULL, 0, REQ_OP_DRV_IN); 289 VPRINTK(KERN_INFO, "... finished\n"); 290 return err; 291 } 292 293 static int ch_readconfig(scsi_changer * ch)294 ch_readconfig(scsi_changer *ch) 295 { 296 u_char cmd[10], data[16]; 297 u_char *buffer; 298 int result,id,lun,i; 299 u_int elem; 300 301 buffer = kzalloc(512, GFP_KERNEL); 302 if (!buffer) 303 return -ENOMEM; 304 305 memset(cmd,0,sizeof(cmd)); 306 cmd[0] = MODE_SENSE; 307 cmd[1] = (ch->device->lun & 0x7) << 5; 308 cmd[2] = 0x1d; 309 cmd[4] = 255; 310 result = ch_do_scsi(ch, cmd, 10, buffer, 255, REQ_OP_DRV_IN); 311 if (0 != result) { 312 cmd[1] |= (1<<3); 313 result = ch_do_scsi(ch, cmd, 10, buffer, 255, REQ_OP_DRV_IN); 314 } 315 if (0 == result) { 316 ch->firsts[CHET_MT] = 317 (buffer[buffer[3]+ 6] << 8) | buffer[buffer[3]+ 7]; 318 ch->counts[CHET_MT] = 319 (buffer[buffer[3]+ 8] << 8) | buffer[buffer[3]+ 9]; 320 ch->firsts[CHET_ST] = 321 (buffer[buffer[3]+10] << 8) | buffer[buffer[3]+11]; 322 ch->counts[CHET_ST] = 323 (buffer[buffer[3]+12] << 8) | buffer[buffer[3]+13]; 324 ch->firsts[CHET_IE] = 325 (buffer[buffer[3]+14] << 8) | buffer[buffer[3]+15]; 326 ch->counts[CHET_IE] = 327 (buffer[buffer[3]+16] << 8) | buffer[buffer[3]+17]; 328 ch->firsts[CHET_DT] = 329 (buffer[buffer[3]+18] << 8) | buffer[buffer[3]+19]; 330 ch->counts[CHET_DT] = 331 (buffer[buffer[3]+20] << 8) | buffer[buffer[3]+21]; 332 VPRINTK(KERN_INFO, "type #1 (mt): 0x%x+%d [medium transport]\n", 333 ch->firsts[CHET_MT], 334 ch->counts[CHET_MT]); 335 VPRINTK(KERN_INFO, "type #2 (st): 0x%x+%d [storage]\n", 336 ch->firsts[CHET_ST], 337 ch->counts[CHET_ST]); 338 VPRINTK(KERN_INFO, "type #3 (ie): 0x%x+%d [import/export]\n", 339 ch->firsts[CHET_IE], 340 ch->counts[CHET_IE]); 341 VPRINTK(KERN_INFO, "type #4 (dt): 0x%x+%d [data transfer]\n", 342 ch->firsts[CHET_DT], 343 ch->counts[CHET_DT]); 344 } else { 345 VPRINTK(KERN_INFO, "reading element address assignment page failed!\n"); 346 } 347 348 /* vendor specific element types */ 349 for (i = 0; i < 4; i++) { 350 if (0 == vendor_counts[i]) 351 continue; 352 if (NULL == vendor_labels[i]) 353 continue; 354 ch->firsts[CHET_V1+i] = vendor_firsts[i]; 355 ch->counts[CHET_V1+i] = vendor_counts[i]; 356 VPRINTK(KERN_INFO, "type #%d (v%d): 0x%x+%d [%s, vendor specific]\n", 357 i+5,i+1,vendor_firsts[i],vendor_counts[i], 358 vendor_labels[i]); 359 } 360 361 /* look up the devices of the data transfer elements */ 362 ch->dt = kcalloc(ch->counts[CHET_DT], sizeof(*ch->dt), 363 GFP_KERNEL); 364 365 if (!ch->dt) { 366 kfree(buffer); 367 return -ENOMEM; 368 } 369 370 for (elem = 0; elem < ch->counts[CHET_DT]; elem++) { 371 id = -1; 372 lun = 0; 373 if (elem < CH_DT_MAX && -1 != dt_id[elem]) { 374 id = dt_id[elem]; 375 lun = dt_lun[elem]; 376 VPRINTK(KERN_INFO, "dt 0x%x: [insmod option] ", 377 elem+ch->firsts[CHET_DT]); 378 } else if (0 != ch_read_element_status 379 (ch,elem+ch->firsts[CHET_DT],data)) { 380 VPRINTK(KERN_INFO, "dt 0x%x: READ ELEMENT STATUS failed\n", 381 elem+ch->firsts[CHET_DT]); 382 } else { 383 VPRINTK(KERN_INFO, "dt 0x%x: ",elem+ch->firsts[CHET_DT]); 384 if (data[6] & 0x80) { 385 VPRINTK(KERN_CONT, "not this SCSI bus\n"); 386 ch->dt[elem] = NULL; 387 } else if (0 == (data[6] & 0x30)) { 388 VPRINTK(KERN_CONT, "ID/LUN unknown\n"); 389 ch->dt[elem] = NULL; 390 } else { 391 id = ch->device->id; 392 lun = 0; 393 if (data[6] & 0x20) id = data[7]; 394 if (data[6] & 0x10) lun = data[6] & 7; 395 } 396 } 397 if (-1 != id) { 398 VPRINTK(KERN_CONT, "ID %i, LUN %i, ",id,lun); 399 ch->dt[elem] = 400 scsi_device_lookup(ch->device->host, 401 ch->device->channel, 402 id,lun); 403 if (!ch->dt[elem]) { 404 /* should not happen */ 405 VPRINTK(KERN_CONT, "Huh? device not found!\n"); 406 } else { 407 VPRINTK(KERN_CONT, "name: %8.8s %16.16s %4.4s\n", 408 ch->dt[elem]->vendor, 409 ch->dt[elem]->model, 410 ch->dt[elem]->rev); 411 } 412 } 413 } 414 ch->voltags = 1; 415 kfree(buffer); 416 417 return 0; 418 } 419 420 /* ------------------------------------------------------------------------ */ 421 422 static int ch_position(scsi_changer * ch,u_int trans,u_int elem,int rotate)423 ch_position(scsi_changer *ch, u_int trans, u_int elem, int rotate) 424 { 425 u_char cmd[10]; 426 427 DPRINTK("position: 0x%x\n",elem); 428 if (0 == trans) 429 trans = ch->firsts[CHET_MT]; 430 memset(cmd,0,sizeof(cmd)); 431 cmd[0] = POSITION_TO_ELEMENT; 432 cmd[1] = (ch->device->lun & 0x7) << 5; 433 cmd[2] = (trans >> 8) & 0xff; 434 cmd[3] = trans & 0xff; 435 cmd[4] = (elem >> 8) & 0xff; 436 cmd[5] = elem & 0xff; 437 cmd[8] = rotate ? 1 : 0; 438 return ch_do_scsi(ch, cmd, 10, NULL, 0, REQ_OP_DRV_IN); 439 } 440 441 static int ch_move(scsi_changer * ch,u_int trans,u_int src,u_int dest,int rotate)442 ch_move(scsi_changer *ch, u_int trans, u_int src, u_int dest, int rotate) 443 { 444 u_char cmd[12]; 445 446 DPRINTK("move: 0x%x => 0x%x\n",src,dest); 447 if (0 == trans) 448 trans = ch->firsts[CHET_MT]; 449 memset(cmd,0,sizeof(cmd)); 450 cmd[0] = MOVE_MEDIUM; 451 cmd[1] = (ch->device->lun & 0x7) << 5; 452 cmd[2] = (trans >> 8) & 0xff; 453 cmd[3] = trans & 0xff; 454 cmd[4] = (src >> 8) & 0xff; 455 cmd[5] = src & 0xff; 456 cmd[6] = (dest >> 8) & 0xff; 457 cmd[7] = dest & 0xff; 458 cmd[10] = rotate ? 1 : 0; 459 return ch_do_scsi(ch, cmd, 12, NULL, 0, REQ_OP_DRV_IN); 460 } 461 462 static int ch_exchange(scsi_changer * ch,u_int trans,u_int src,u_int dest1,u_int dest2,int rotate1,int rotate2)463 ch_exchange(scsi_changer *ch, u_int trans, u_int src, 464 u_int dest1, u_int dest2, int rotate1, int rotate2) 465 { 466 u_char cmd[12]; 467 468 DPRINTK("exchange: 0x%x => 0x%x => 0x%x\n", 469 src,dest1,dest2); 470 if (0 == trans) 471 trans = ch->firsts[CHET_MT]; 472 memset(cmd,0,sizeof(cmd)); 473 cmd[0] = EXCHANGE_MEDIUM; 474 cmd[1] = (ch->device->lun & 0x7) << 5; 475 cmd[2] = (trans >> 8) & 0xff; 476 cmd[3] = trans & 0xff; 477 cmd[4] = (src >> 8) & 0xff; 478 cmd[5] = src & 0xff; 479 cmd[6] = (dest1 >> 8) & 0xff; 480 cmd[7] = dest1 & 0xff; 481 cmd[8] = (dest2 >> 8) & 0xff; 482 cmd[9] = dest2 & 0xff; 483 cmd[10] = (rotate1 ? 1 : 0) | (rotate2 ? 2 : 0); 484 485 return ch_do_scsi(ch, cmd, 12, NULL, 0, REQ_OP_DRV_IN); 486 } 487 488 static void ch_check_voltag(char * tag)489 ch_check_voltag(char *tag) 490 { 491 int i; 492 493 for (i = 0; i < 32; i++) { 494 /* restrict to ascii */ 495 if (tag[i] >= 0x7f || tag[i] < 0x20) 496 tag[i] = ' '; 497 /* don't allow search wildcards */ 498 if (tag[i] == '?' || 499 tag[i] == '*') 500 tag[i] = ' '; 501 } 502 } 503 504 static int ch_set_voltag(scsi_changer * ch,u_int elem,int alternate,int clear,u_char * tag)505 ch_set_voltag(scsi_changer *ch, u_int elem, 506 int alternate, int clear, u_char *tag) 507 { 508 u_char cmd[12]; 509 u_char *buffer; 510 int result; 511 512 buffer = kzalloc(512, GFP_KERNEL); 513 if (!buffer) 514 return -ENOMEM; 515 516 DPRINTK("%s %s voltag: 0x%x => \"%s\"\n", 517 clear ? "clear" : "set", 518 alternate ? "alternate" : "primary", 519 elem, tag); 520 memset(cmd,0,sizeof(cmd)); 521 cmd[0] = SEND_VOLUME_TAG; 522 cmd[1] = ((ch->device->lun & 0x7) << 5) | 523 ch_elem_to_typecode(ch,elem); 524 cmd[2] = (elem >> 8) & 0xff; 525 cmd[3] = elem & 0xff; 526 cmd[5] = clear 527 ? (alternate ? 0x0d : 0x0c) 528 : (alternate ? 0x0b : 0x0a); 529 530 cmd[9] = 255; 531 532 memcpy(buffer,tag,32); 533 ch_check_voltag(buffer); 534 535 result = ch_do_scsi(ch, cmd, 12, buffer, 256, REQ_OP_DRV_OUT); 536 kfree(buffer); 537 return result; 538 } 539 ch_gstatus(scsi_changer * ch,int type,unsigned char __user * dest)540 static int ch_gstatus(scsi_changer *ch, int type, unsigned char __user *dest) 541 { 542 int retval = 0; 543 u_char data[16]; 544 unsigned int i; 545 546 mutex_lock(&ch->lock); 547 for (i = 0; i < ch->counts[type]; i++) { 548 if (0 != ch_read_element_status 549 (ch, ch->firsts[type]+i,data)) { 550 retval = -EIO; 551 break; 552 } 553 put_user(data[2], dest+i); 554 if (data[2] & CESTATUS_EXCEPT) 555 VPRINTK(KERN_INFO, "element 0x%x: asc=0x%x, ascq=0x%x\n", 556 ch->firsts[type]+i, 557 (int)data[4],(int)data[5]); 558 retval = ch_read_element_status 559 (ch, ch->firsts[type]+i,data); 560 if (0 != retval) 561 break; 562 } 563 mutex_unlock(&ch->lock); 564 return retval; 565 } 566 567 /* ------------------------------------------------------------------------ */ 568 ch_destroy(struct kref * ref)569 static void ch_destroy(struct kref *ref) 570 { 571 scsi_changer *ch = container_of(ref, scsi_changer, ref); 572 573 ch->device = NULL; 574 kfree(ch->dt); 575 kfree(ch); 576 } 577 578 static int ch_release(struct inode * inode,struct file * file)579 ch_release(struct inode *inode, struct file *file) 580 { 581 scsi_changer *ch = file->private_data; 582 583 scsi_device_put(ch->device); 584 file->private_data = NULL; 585 kref_put(&ch->ref, ch_destroy); 586 return 0; 587 } 588 589 static int ch_open(struct inode * inode,struct file * file)590 ch_open(struct inode *inode, struct file *file) 591 { 592 scsi_changer *ch; 593 int minor = iminor(inode); 594 595 spin_lock(&ch_index_lock); 596 ch = idr_find(&ch_index_idr, minor); 597 598 if (ch == NULL || !kref_get_unless_zero(&ch->ref)) { 599 spin_unlock(&ch_index_lock); 600 return -ENXIO; 601 } 602 spin_unlock(&ch_index_lock); 603 if (scsi_device_get(ch->device)) { 604 kref_put(&ch->ref, ch_destroy); 605 return -ENXIO; 606 } 607 /* Synchronize with ch_probe() */ 608 mutex_lock(&ch->lock); 609 file->private_data = ch; 610 mutex_unlock(&ch->lock); 611 return 0; 612 } 613 614 static int ch_checkrange(scsi_changer * ch,unsigned int type,unsigned int unit)615 ch_checkrange(scsi_changer *ch, unsigned int type, unsigned int unit) 616 { 617 if (type >= CH_TYPES || unit >= ch->counts[type]) 618 return -1; 619 return 0; 620 } 621 622 struct changer_element_status32 { 623 int ces_type; 624 compat_uptr_t ces_data; 625 }; 626 #define CHIOGSTATUS32 _IOW('c', 8, struct changer_element_status32) 627 ch_ioctl(struct file * file,unsigned int cmd,unsigned long arg)628 static long ch_ioctl(struct file *file, 629 unsigned int cmd, unsigned long arg) 630 { 631 scsi_changer *ch = file->private_data; 632 int retval; 633 void __user *argp = (void __user *)arg; 634 635 retval = scsi_ioctl_block_when_processing_errors(ch->device, cmd, 636 file->f_flags & O_NDELAY); 637 if (retval) 638 return retval; 639 640 switch (cmd) { 641 case CHIOGPARAMS: 642 { 643 struct changer_params params; 644 645 params.cp_curpicker = 0; 646 params.cp_npickers = ch->counts[CHET_MT]; 647 params.cp_nslots = ch->counts[CHET_ST]; 648 params.cp_nportals = ch->counts[CHET_IE]; 649 params.cp_ndrives = ch->counts[CHET_DT]; 650 651 if (copy_to_user(argp, ¶ms, sizeof(params))) 652 return -EFAULT; 653 return 0; 654 } 655 case CHIOGVPARAMS: 656 { 657 struct changer_vendor_params vparams; 658 659 memset(&vparams,0,sizeof(vparams)); 660 if (ch->counts[CHET_V1]) { 661 vparams.cvp_n1 = ch->counts[CHET_V1]; 662 strncpy(vparams.cvp_label1,vendor_labels[0],16); 663 } 664 if (ch->counts[CHET_V2]) { 665 vparams.cvp_n2 = ch->counts[CHET_V2]; 666 strncpy(vparams.cvp_label2,vendor_labels[1],16); 667 } 668 if (ch->counts[CHET_V3]) { 669 vparams.cvp_n3 = ch->counts[CHET_V3]; 670 strncpy(vparams.cvp_label3,vendor_labels[2],16); 671 } 672 if (ch->counts[CHET_V4]) { 673 vparams.cvp_n4 = ch->counts[CHET_V4]; 674 strncpy(vparams.cvp_label4,vendor_labels[3],16); 675 } 676 if (copy_to_user(argp, &vparams, sizeof(vparams))) 677 return -EFAULT; 678 return 0; 679 } 680 681 case CHIOPOSITION: 682 { 683 struct changer_position pos; 684 685 if (copy_from_user(&pos, argp, sizeof (pos))) 686 return -EFAULT; 687 688 if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) { 689 DPRINTK("CHIOPOSITION: invalid parameter\n"); 690 return -EBADSLT; 691 } 692 mutex_lock(&ch->lock); 693 retval = ch_position(ch,0, 694 ch->firsts[pos.cp_type] + pos.cp_unit, 695 pos.cp_flags & CP_INVERT); 696 mutex_unlock(&ch->lock); 697 return retval; 698 } 699 700 case CHIOMOVE: 701 { 702 struct changer_move mv; 703 704 if (copy_from_user(&mv, argp, sizeof (mv))) 705 return -EFAULT; 706 707 if (0 != ch_checkrange(ch, mv.cm_fromtype, mv.cm_fromunit) || 708 0 != ch_checkrange(ch, mv.cm_totype, mv.cm_tounit )) { 709 DPRINTK("CHIOMOVE: invalid parameter\n"); 710 return -EBADSLT; 711 } 712 713 mutex_lock(&ch->lock); 714 retval = ch_move(ch,0, 715 ch->firsts[mv.cm_fromtype] + mv.cm_fromunit, 716 ch->firsts[mv.cm_totype] + mv.cm_tounit, 717 mv.cm_flags & CM_INVERT); 718 mutex_unlock(&ch->lock); 719 return retval; 720 } 721 722 case CHIOEXCHANGE: 723 { 724 struct changer_exchange mv; 725 726 if (copy_from_user(&mv, argp, sizeof (mv))) 727 return -EFAULT; 728 729 if (0 != ch_checkrange(ch, mv.ce_srctype, mv.ce_srcunit ) || 730 0 != ch_checkrange(ch, mv.ce_fdsttype, mv.ce_fdstunit) || 731 0 != ch_checkrange(ch, mv.ce_sdsttype, mv.ce_sdstunit)) { 732 DPRINTK("CHIOEXCHANGE: invalid parameter\n"); 733 return -EBADSLT; 734 } 735 736 mutex_lock(&ch->lock); 737 retval = ch_exchange 738 (ch,0, 739 ch->firsts[mv.ce_srctype] + mv.ce_srcunit, 740 ch->firsts[mv.ce_fdsttype] + mv.ce_fdstunit, 741 ch->firsts[mv.ce_sdsttype] + mv.ce_sdstunit, 742 mv.ce_flags & CE_INVERT1, mv.ce_flags & CE_INVERT2); 743 mutex_unlock(&ch->lock); 744 return retval; 745 } 746 747 case CHIOGSTATUS: 748 { 749 struct changer_element_status ces; 750 751 if (copy_from_user(&ces, argp, sizeof (ces))) 752 return -EFAULT; 753 if (ces.ces_type < 0 || ces.ces_type >= CH_TYPES) 754 return -EINVAL; 755 756 return ch_gstatus(ch, ces.ces_type, ces.ces_data); 757 } 758 #ifdef CONFIG_COMPAT 759 case CHIOGSTATUS32: 760 { 761 struct changer_element_status32 ces32; 762 763 if (copy_from_user(&ces32, argp, sizeof(ces32))) 764 return -EFAULT; 765 if (ces32.ces_type < 0 || ces32.ces_type >= CH_TYPES) 766 return -EINVAL; 767 768 return ch_gstatus(ch, ces32.ces_type, 769 compat_ptr(ces32.ces_data)); 770 } 771 #endif 772 case CHIOGELEM: 773 { 774 struct changer_get_element cge; 775 u_char ch_cmd[12]; 776 u_char *buffer; 777 unsigned int elem; 778 int result,i; 779 780 if (copy_from_user(&cge, argp, sizeof (cge))) 781 return -EFAULT; 782 783 if (0 != ch_checkrange(ch, cge.cge_type, cge.cge_unit)) 784 return -EINVAL; 785 elem = ch->firsts[cge.cge_type] + cge.cge_unit; 786 787 buffer = kmalloc(512, GFP_KERNEL); 788 if (!buffer) 789 return -ENOMEM; 790 mutex_lock(&ch->lock); 791 792 voltag_retry: 793 memset(ch_cmd, 0, sizeof(ch_cmd)); 794 ch_cmd[0] = READ_ELEMENT_STATUS; 795 ch_cmd[1] = ((ch->device->lun & 0x7) << 5) | 796 (ch->voltags ? 0x10 : 0) | 797 ch_elem_to_typecode(ch,elem); 798 ch_cmd[2] = (elem >> 8) & 0xff; 799 ch_cmd[3] = elem & 0xff; 800 ch_cmd[5] = 1; 801 ch_cmd[9] = 255; 802 803 result = ch_do_scsi(ch, ch_cmd, 12, buffer, 256, REQ_OP_DRV_IN); 804 if (!result) { 805 cge.cge_status = buffer[18]; 806 cge.cge_flags = 0; 807 if (buffer[18] & CESTATUS_EXCEPT) { 808 cge.cge_errno = EIO; 809 } 810 if (buffer[25] & 0x80) { 811 cge.cge_flags |= CGE_SRC; 812 if (buffer[25] & 0x40) 813 cge.cge_flags |= CGE_INVERT; 814 elem = (buffer[26]<<8) | buffer[27]; 815 for (i = 0; i < 4; i++) { 816 if (elem >= ch->firsts[i] && 817 elem < ch->firsts[i] + ch->counts[i]) { 818 cge.cge_srctype = i; 819 cge.cge_srcunit = elem-ch->firsts[i]; 820 } 821 } 822 } 823 if ((buffer[22] & 0x30) == 0x30) { 824 cge.cge_flags |= CGE_IDLUN; 825 cge.cge_id = buffer[23]; 826 cge.cge_lun = buffer[22] & 7; 827 } 828 if (buffer[9] & 0x80) { 829 cge.cge_flags |= CGE_PVOLTAG; 830 memcpy(cge.cge_pvoltag,buffer+28,36); 831 } 832 if (buffer[9] & 0x40) { 833 cge.cge_flags |= CGE_AVOLTAG; 834 memcpy(cge.cge_avoltag,buffer+64,36); 835 } 836 } else if (ch->voltags) { 837 ch->voltags = 0; 838 VPRINTK(KERN_INFO, "device has no volume tag support\n"); 839 goto voltag_retry; 840 } 841 kfree(buffer); 842 mutex_unlock(&ch->lock); 843 844 if (copy_to_user(argp, &cge, sizeof (cge))) 845 return -EFAULT; 846 return result; 847 } 848 849 case CHIOINITELEM: 850 { 851 mutex_lock(&ch->lock); 852 retval = ch_init_elem(ch); 853 mutex_unlock(&ch->lock); 854 return retval; 855 } 856 857 case CHIOSVOLTAG: 858 { 859 struct changer_set_voltag csv; 860 int elem; 861 862 if (copy_from_user(&csv, argp, sizeof(csv))) 863 return -EFAULT; 864 865 if (0 != ch_checkrange(ch, csv.csv_type, csv.csv_unit)) { 866 DPRINTK("CHIOSVOLTAG: invalid parameter\n"); 867 return -EBADSLT; 868 } 869 elem = ch->firsts[csv.csv_type] + csv.csv_unit; 870 mutex_lock(&ch->lock); 871 retval = ch_set_voltag(ch, elem, 872 csv.csv_flags & CSV_AVOLTAG, 873 csv.csv_flags & CSV_CLEARTAG, 874 csv.csv_voltag); 875 mutex_unlock(&ch->lock); 876 return retval; 877 } 878 879 default: 880 return scsi_ioctl(ch->device, file->f_mode & FMODE_WRITE, cmd, 881 argp); 882 883 } 884 } 885 886 /* ------------------------------------------------------------------------ */ 887 ch_probe(struct device * dev)888 static int ch_probe(struct device *dev) 889 { 890 struct scsi_device *sd = to_scsi_device(dev); 891 struct device *class_dev; 892 int ret; 893 scsi_changer *ch; 894 895 if (sd->type != TYPE_MEDIUM_CHANGER) 896 return -ENODEV; 897 898 ch = kzalloc(sizeof(*ch), GFP_KERNEL); 899 if (NULL == ch) 900 return -ENOMEM; 901 902 idr_preload(GFP_KERNEL); 903 spin_lock(&ch_index_lock); 904 ret = idr_alloc(&ch_index_idr, ch, 0, CH_MAX_DEVS + 1, GFP_NOWAIT); 905 spin_unlock(&ch_index_lock); 906 idr_preload_end(); 907 908 if (ret < 0) { 909 if (ret == -ENOSPC) 910 ret = -ENODEV; 911 goto free_ch; 912 } 913 914 ch->minor = ret; 915 sprintf(ch->name,"ch%d",ch->minor); 916 ret = scsi_device_get(sd); 917 if (ret) { 918 sdev_printk(KERN_WARNING, sd, "ch%d: failed to get device\n", 919 ch->minor); 920 goto remove_idr; 921 } 922 923 mutex_init(&ch->lock); 924 kref_init(&ch->ref); 925 ch->device = sd; 926 class_dev = device_create(ch_sysfs_class, dev, 927 MKDEV(SCSI_CHANGER_MAJOR, ch->minor), ch, 928 "s%s", ch->name); 929 if (IS_ERR(class_dev)) { 930 sdev_printk(KERN_WARNING, sd, "ch%d: device_create failed\n", 931 ch->minor); 932 ret = PTR_ERR(class_dev); 933 goto put_device; 934 } 935 936 mutex_lock(&ch->lock); 937 ret = ch_readconfig(ch); 938 if (ret) { 939 mutex_unlock(&ch->lock); 940 goto destroy_dev; 941 } 942 if (init) 943 ch_init_elem(ch); 944 945 mutex_unlock(&ch->lock); 946 dev_set_drvdata(dev, ch); 947 sdev_printk(KERN_INFO, sd, "Attached scsi changer %s\n", ch->name); 948 949 return 0; 950 destroy_dev: 951 device_destroy(ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR, ch->minor)); 952 put_device: 953 scsi_device_put(sd); 954 remove_idr: 955 idr_remove(&ch_index_idr, ch->minor); 956 free_ch: 957 kfree(ch); 958 return ret; 959 } 960 ch_remove(struct device * dev)961 static int ch_remove(struct device *dev) 962 { 963 scsi_changer *ch = dev_get_drvdata(dev); 964 965 spin_lock(&ch_index_lock); 966 idr_remove(&ch_index_idr, ch->minor); 967 dev_set_drvdata(dev, NULL); 968 spin_unlock(&ch_index_lock); 969 970 device_destroy(ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR,ch->minor)); 971 scsi_device_put(ch->device); 972 kref_put(&ch->ref, ch_destroy); 973 return 0; 974 } 975 976 static struct scsi_driver ch_template = { 977 .gendrv = { 978 .name = "ch", 979 .owner = THIS_MODULE, 980 .probe = ch_probe, 981 .remove = ch_remove, 982 }, 983 }; 984 985 static const struct file_operations changer_fops = { 986 .owner = THIS_MODULE, 987 .open = ch_open, 988 .release = ch_release, 989 .unlocked_ioctl = ch_ioctl, 990 .compat_ioctl = compat_ptr_ioctl, 991 .llseek = noop_llseek, 992 }; 993 init_ch_module(void)994 static int __init init_ch_module(void) 995 { 996 int rc; 997 998 printk(KERN_INFO "SCSI Media Changer driver v" VERSION " \n"); 999 ch_sysfs_class = class_create("scsi_changer"); 1000 if (IS_ERR(ch_sysfs_class)) { 1001 rc = PTR_ERR(ch_sysfs_class); 1002 return rc; 1003 } 1004 rc = register_chrdev(SCSI_CHANGER_MAJOR,"ch",&changer_fops); 1005 if (rc < 0) { 1006 printk("Unable to get major %d for SCSI-Changer\n", 1007 SCSI_CHANGER_MAJOR); 1008 goto fail1; 1009 } 1010 rc = scsi_register_driver(&ch_template.gendrv); 1011 if (rc < 0) 1012 goto fail2; 1013 return 0; 1014 1015 fail2: 1016 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch"); 1017 fail1: 1018 class_destroy(ch_sysfs_class); 1019 return rc; 1020 } 1021 exit_ch_module(void)1022 static void __exit exit_ch_module(void) 1023 { 1024 scsi_unregister_driver(&ch_template.gendrv); 1025 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch"); 1026 class_destroy(ch_sysfs_class); 1027 idr_destroy(&ch_index_idr); 1028 } 1029 1030 module_init(init_ch_module); 1031 module_exit(exit_ch_module); 1032