1 /** 2 * drivers/usb/class/usbtmc.c - USB Test & Measurement class driver 3 * 4 * Copyright (C) 2007 Stefan Kopp, Gechingen, Germany 5 * Copyright (C) 2008 Novell, Inc. 6 * Copyright (C) 2008 Greg Kroah-Hartman <gregkh@suse.de> 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License 10 * as published by the Free Software Foundation; either version 2 11 * of the License, or (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * The GNU General Public License is available at 19 * http://www.gnu.org/copyleft/gpl.html. 20 */ 21 22 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 23 24 #include <linux/module.h> 25 #include <linux/kernel.h> 26 #include <linux/fs.h> 27 #include <linux/uaccess.h> 28 #include <linux/kref.h> 29 #include <linux/slab.h> 30 #include <linux/poll.h> 31 #include <linux/mutex.h> 32 #include <linux/usb.h> 33 #include <linux/usb/tmc.h> 34 35 36 #define RIGOL 1 37 #define USBTMC_HEADER_SIZE 12 38 #define USBTMC_MINOR_BASE 176 39 40 /* 41 * Size of driver internal IO buffer. Must be multiple of 4 and at least as 42 * large as wMaxPacketSize (which is usually 512 bytes). 43 */ 44 #define USBTMC_SIZE_IOBUFFER 2048 45 46 /* Default USB timeout (in milliseconds) */ 47 #define USBTMC_TIMEOUT 5000 48 49 /* 50 * Maximum number of read cycles to empty bulk in endpoint during CLEAR and 51 * ABORT_BULK_IN requests. Ends the loop if (for whatever reason) a short 52 * packet is never read. 53 */ 54 #define USBTMC_MAX_READS_TO_CLEAR_BULK_IN 100 55 56 static const struct usb_device_id usbtmc_devices[] = { 57 { USB_INTERFACE_INFO(USB_CLASS_APP_SPEC, 3, 0), }, 58 { USB_INTERFACE_INFO(USB_CLASS_APP_SPEC, 3, 1), }, 59 { 0, } /* terminating entry */ 60 }; 61 MODULE_DEVICE_TABLE(usb, usbtmc_devices); 62 63 /* 64 * This structure is the capabilities for the device 65 * See section 4.2.1.8 of the USBTMC specification, 66 * and section 4.2.2 of the USBTMC usb488 subclass 67 * specification for details. 68 */ 69 struct usbtmc_dev_capabilities { 70 __u8 interface_capabilities; 71 __u8 device_capabilities; 72 __u8 usb488_interface_capabilities; 73 __u8 usb488_device_capabilities; 74 }; 75 76 /* This structure holds private data for each USBTMC device. One copy is 77 * allocated for each USBTMC device in the driver's probe function. 78 */ 79 struct usbtmc_device_data { 80 const struct usb_device_id *id; 81 struct usb_device *usb_dev; 82 struct usb_interface *intf; 83 84 unsigned int bulk_in; 85 unsigned int bulk_out; 86 87 u8 bTag; 88 u8 bTag_last_write; /* needed for abort */ 89 u8 bTag_last_read; /* needed for abort */ 90 91 /* data for interrupt in endpoint handling */ 92 u8 bNotify1; 93 u8 bNotify2; 94 u16 ifnum; 95 u8 iin_bTag; 96 u8 *iin_buffer; 97 atomic_t iin_data_valid; 98 unsigned int iin_ep; 99 int iin_ep_present; 100 int iin_interval; 101 struct urb *iin_urb; 102 u16 iin_wMaxPacketSize; 103 atomic_t srq_asserted; 104 105 /* coalesced usb488_caps from usbtmc_dev_capabilities */ 106 __u8 usb488_caps; 107 108 u8 rigol_quirk; 109 110 /* attributes from the USB TMC spec for this device */ 111 u8 TermChar; 112 bool TermCharEnabled; 113 bool auto_abort; 114 115 bool zombie; /* fd of disconnected device */ 116 117 struct usbtmc_dev_capabilities capabilities; 118 struct kref kref; 119 struct mutex io_mutex; /* only one i/o function running at a time */ 120 wait_queue_head_t waitq; 121 struct fasync_struct *fasync; 122 }; 123 #define to_usbtmc_data(d) container_of(d, struct usbtmc_device_data, kref) 124 125 struct usbtmc_ID_rigol_quirk { 126 __u16 idVendor; 127 __u16 idProduct; 128 }; 129 130 static const struct usbtmc_ID_rigol_quirk usbtmc_id_quirk[] = { 131 { 0x1ab1, 0x0588 }, 132 { 0x1ab1, 0x04b0 }, 133 { 0, 0 } 134 }; 135 136 /* Forward declarations */ 137 static struct usb_driver usbtmc_driver; 138 139 static void usbtmc_delete(struct kref *kref) 140 { 141 struct usbtmc_device_data *data = to_usbtmc_data(kref); 142 143 usb_put_dev(data->usb_dev); 144 } 145 146 static int usbtmc_open(struct inode *inode, struct file *filp) 147 { 148 struct usb_interface *intf; 149 struct usbtmc_device_data *data; 150 int retval = 0; 151 152 intf = usb_find_interface(&usbtmc_driver, iminor(inode)); 153 if (!intf) { 154 pr_err("can not find device for minor %d", iminor(inode)); 155 return -ENODEV; 156 } 157 158 data = usb_get_intfdata(intf); 159 kref_get(&data->kref); 160 161 /* Store pointer in file structure's private data field */ 162 filp->private_data = data; 163 164 return retval; 165 } 166 167 static int usbtmc_release(struct inode *inode, struct file *file) 168 { 169 struct usbtmc_device_data *data = file->private_data; 170 171 kref_put(&data->kref, usbtmc_delete); 172 return 0; 173 } 174 175 static int usbtmc_ioctl_abort_bulk_in(struct usbtmc_device_data *data) 176 { 177 u8 *buffer; 178 struct device *dev; 179 int rv; 180 int n; 181 int actual; 182 struct usb_host_interface *current_setting; 183 int max_size; 184 185 dev = &data->intf->dev; 186 buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL); 187 if (!buffer) 188 return -ENOMEM; 189 190 rv = usb_control_msg(data->usb_dev, 191 usb_rcvctrlpipe(data->usb_dev, 0), 192 USBTMC_REQUEST_INITIATE_ABORT_BULK_IN, 193 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT, 194 data->bTag_last_read, data->bulk_in, 195 buffer, 2, USBTMC_TIMEOUT); 196 197 if (rv < 0) { 198 dev_err(dev, "usb_control_msg returned %d\n", rv); 199 goto exit; 200 } 201 202 dev_dbg(dev, "INITIATE_ABORT_BULK_IN returned %x\n", buffer[0]); 203 204 if (buffer[0] == USBTMC_STATUS_FAILED) { 205 rv = 0; 206 goto exit; 207 } 208 209 if (buffer[0] != USBTMC_STATUS_SUCCESS) { 210 dev_err(dev, "INITIATE_ABORT_BULK_IN returned %x\n", 211 buffer[0]); 212 rv = -EPERM; 213 goto exit; 214 } 215 216 max_size = 0; 217 current_setting = data->intf->cur_altsetting; 218 for (n = 0; n < current_setting->desc.bNumEndpoints; n++) 219 if (current_setting->endpoint[n].desc.bEndpointAddress == 220 data->bulk_in) 221 max_size = usb_endpoint_maxp(¤t_setting->endpoint[n].desc); 222 223 if (max_size == 0) { 224 dev_err(dev, "Couldn't get wMaxPacketSize\n"); 225 rv = -EPERM; 226 goto exit; 227 } 228 229 dev_dbg(&data->intf->dev, "wMaxPacketSize is %d\n", max_size); 230 231 n = 0; 232 233 do { 234 dev_dbg(dev, "Reading from bulk in EP\n"); 235 236 rv = usb_bulk_msg(data->usb_dev, 237 usb_rcvbulkpipe(data->usb_dev, 238 data->bulk_in), 239 buffer, USBTMC_SIZE_IOBUFFER, 240 &actual, USBTMC_TIMEOUT); 241 242 n++; 243 244 if (rv < 0) { 245 dev_err(dev, "usb_bulk_msg returned %d\n", rv); 246 goto exit; 247 } 248 } while ((actual == max_size) && 249 (n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN)); 250 251 if (actual == max_size) { 252 dev_err(dev, "Couldn't clear device buffer within %d cycles\n", 253 USBTMC_MAX_READS_TO_CLEAR_BULK_IN); 254 rv = -EPERM; 255 goto exit; 256 } 257 258 n = 0; 259 260 usbtmc_abort_bulk_in_status: 261 rv = usb_control_msg(data->usb_dev, 262 usb_rcvctrlpipe(data->usb_dev, 0), 263 USBTMC_REQUEST_CHECK_ABORT_BULK_IN_STATUS, 264 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT, 265 0, data->bulk_in, buffer, 0x08, 266 USBTMC_TIMEOUT); 267 268 if (rv < 0) { 269 dev_err(dev, "usb_control_msg returned %d\n", rv); 270 goto exit; 271 } 272 273 dev_dbg(dev, "INITIATE_ABORT_BULK_IN returned %x\n", buffer[0]); 274 275 if (buffer[0] == USBTMC_STATUS_SUCCESS) { 276 rv = 0; 277 goto exit; 278 } 279 280 if (buffer[0] != USBTMC_STATUS_PENDING) { 281 dev_err(dev, "INITIATE_ABORT_BULK_IN returned %x\n", buffer[0]); 282 rv = -EPERM; 283 goto exit; 284 } 285 286 if (buffer[1] == 1) 287 do { 288 dev_dbg(dev, "Reading from bulk in EP\n"); 289 290 rv = usb_bulk_msg(data->usb_dev, 291 usb_rcvbulkpipe(data->usb_dev, 292 data->bulk_in), 293 buffer, USBTMC_SIZE_IOBUFFER, 294 &actual, USBTMC_TIMEOUT); 295 296 n++; 297 298 if (rv < 0) { 299 dev_err(dev, "usb_bulk_msg returned %d\n", rv); 300 goto exit; 301 } 302 } while ((actual == max_size) && 303 (n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN)); 304 305 if (actual == max_size) { 306 dev_err(dev, "Couldn't clear device buffer within %d cycles\n", 307 USBTMC_MAX_READS_TO_CLEAR_BULK_IN); 308 rv = -EPERM; 309 goto exit; 310 } 311 312 goto usbtmc_abort_bulk_in_status; 313 314 exit: 315 kfree(buffer); 316 return rv; 317 318 } 319 320 static int usbtmc_ioctl_abort_bulk_out(struct usbtmc_device_data *data) 321 { 322 struct device *dev; 323 u8 *buffer; 324 int rv; 325 int n; 326 327 dev = &data->intf->dev; 328 329 buffer = kmalloc(8, GFP_KERNEL); 330 if (!buffer) 331 return -ENOMEM; 332 333 rv = usb_control_msg(data->usb_dev, 334 usb_rcvctrlpipe(data->usb_dev, 0), 335 USBTMC_REQUEST_INITIATE_ABORT_BULK_OUT, 336 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT, 337 data->bTag_last_write, data->bulk_out, 338 buffer, 2, USBTMC_TIMEOUT); 339 340 if (rv < 0) { 341 dev_err(dev, "usb_control_msg returned %d\n", rv); 342 goto exit; 343 } 344 345 dev_dbg(dev, "INITIATE_ABORT_BULK_OUT returned %x\n", buffer[0]); 346 347 if (buffer[0] != USBTMC_STATUS_SUCCESS) { 348 dev_err(dev, "INITIATE_ABORT_BULK_OUT returned %x\n", 349 buffer[0]); 350 rv = -EPERM; 351 goto exit; 352 } 353 354 n = 0; 355 356 usbtmc_abort_bulk_out_check_status: 357 rv = usb_control_msg(data->usb_dev, 358 usb_rcvctrlpipe(data->usb_dev, 0), 359 USBTMC_REQUEST_CHECK_ABORT_BULK_OUT_STATUS, 360 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT, 361 0, data->bulk_out, buffer, 0x08, 362 USBTMC_TIMEOUT); 363 n++; 364 if (rv < 0) { 365 dev_err(dev, "usb_control_msg returned %d\n", rv); 366 goto exit; 367 } 368 369 dev_dbg(dev, "CHECK_ABORT_BULK_OUT returned %x\n", buffer[0]); 370 371 if (buffer[0] == USBTMC_STATUS_SUCCESS) 372 goto usbtmc_abort_bulk_out_clear_halt; 373 374 if ((buffer[0] == USBTMC_STATUS_PENDING) && 375 (n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN)) 376 goto usbtmc_abort_bulk_out_check_status; 377 378 rv = -EPERM; 379 goto exit; 380 381 usbtmc_abort_bulk_out_clear_halt: 382 rv = usb_clear_halt(data->usb_dev, 383 usb_sndbulkpipe(data->usb_dev, data->bulk_out)); 384 385 if (rv < 0) { 386 dev_err(dev, "usb_control_msg returned %d\n", rv); 387 goto exit; 388 } 389 rv = 0; 390 391 exit: 392 kfree(buffer); 393 return rv; 394 } 395 396 static int usbtmc488_ioctl_read_stb(struct usbtmc_device_data *data, 397 void __user *arg) 398 { 399 struct device *dev = &data->intf->dev; 400 u8 *buffer; 401 u8 tag; 402 __u8 stb; 403 int rv; 404 405 dev_dbg(dev, "Enter ioctl_read_stb iin_ep_present: %d\n", 406 data->iin_ep_present); 407 408 buffer = kmalloc(8, GFP_KERNEL); 409 if (!buffer) 410 return -ENOMEM; 411 412 atomic_set(&data->iin_data_valid, 0); 413 414 /* must issue read_stb before using poll or select */ 415 atomic_set(&data->srq_asserted, 0); 416 417 rv = usb_control_msg(data->usb_dev, 418 usb_rcvctrlpipe(data->usb_dev, 0), 419 USBTMC488_REQUEST_READ_STATUS_BYTE, 420 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE, 421 data->iin_bTag, 422 data->ifnum, 423 buffer, 0x03, USBTMC_TIMEOUT); 424 if (rv < 0) { 425 dev_err(dev, "stb usb_control_msg returned %d\n", rv); 426 goto exit; 427 } 428 429 if (buffer[0] != USBTMC_STATUS_SUCCESS) { 430 dev_err(dev, "control status returned %x\n", buffer[0]); 431 rv = -EIO; 432 goto exit; 433 } 434 435 if (data->iin_ep_present) { 436 rv = wait_event_interruptible_timeout( 437 data->waitq, 438 atomic_read(&data->iin_data_valid) != 0, 439 USBTMC_TIMEOUT); 440 if (rv < 0) { 441 dev_dbg(dev, "wait interrupted %d\n", rv); 442 goto exit; 443 } 444 445 if (rv == 0) { 446 dev_dbg(dev, "wait timed out\n"); 447 rv = -ETIME; 448 goto exit; 449 } 450 451 tag = data->bNotify1 & 0x7f; 452 if (tag != data->iin_bTag) { 453 dev_err(dev, "expected bTag %x got %x\n", 454 data->iin_bTag, tag); 455 } 456 457 stb = data->bNotify2; 458 } else { 459 stb = buffer[2]; 460 } 461 462 rv = copy_to_user(arg, &stb, sizeof(stb)); 463 if (rv) 464 rv = -EFAULT; 465 466 exit: 467 /* bump interrupt bTag */ 468 data->iin_bTag += 1; 469 if (data->iin_bTag > 127) 470 /* 1 is for SRQ see USBTMC-USB488 subclass spec section 4.3.1 */ 471 data->iin_bTag = 2; 472 473 kfree(buffer); 474 return rv; 475 } 476 477 static int usbtmc488_ioctl_simple(struct usbtmc_device_data *data, 478 void __user *arg, unsigned int cmd) 479 { 480 struct device *dev = &data->intf->dev; 481 __u8 val; 482 u8 *buffer; 483 u16 wValue; 484 int rv; 485 486 if (!(data->usb488_caps & USBTMC488_CAPABILITY_SIMPLE)) 487 return -EINVAL; 488 489 buffer = kmalloc(8, GFP_KERNEL); 490 if (!buffer) 491 return -ENOMEM; 492 493 if (cmd == USBTMC488_REQUEST_REN_CONTROL) { 494 rv = copy_from_user(&val, arg, sizeof(val)); 495 if (rv) { 496 rv = -EFAULT; 497 goto exit; 498 } 499 wValue = val ? 1 : 0; 500 } else { 501 wValue = 0; 502 } 503 504 rv = usb_control_msg(data->usb_dev, 505 usb_rcvctrlpipe(data->usb_dev, 0), 506 cmd, 507 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE, 508 wValue, 509 data->ifnum, 510 buffer, 0x01, USBTMC_TIMEOUT); 511 if (rv < 0) { 512 dev_err(dev, "simple usb_control_msg failed %d\n", rv); 513 goto exit; 514 } else if (rv != 1) { 515 dev_warn(dev, "simple usb_control_msg returned %d\n", rv); 516 rv = -EIO; 517 goto exit; 518 } 519 520 if (buffer[0] != USBTMC_STATUS_SUCCESS) { 521 dev_err(dev, "simple control status returned %x\n", buffer[0]); 522 rv = -EIO; 523 goto exit; 524 } 525 rv = 0; 526 527 exit: 528 kfree(buffer); 529 return rv; 530 } 531 532 /* 533 * Sends a REQUEST_DEV_DEP_MSG_IN message on the Bulk-IN endpoint. 534 * @transfer_size: number of bytes to request from the device. 535 * 536 * See the USBTMC specification, Table 4. 537 * 538 * Also updates bTag_last_write. 539 */ 540 static int send_request_dev_dep_msg_in(struct usbtmc_device_data *data, size_t transfer_size) 541 { 542 int retval; 543 u8 *buffer; 544 int actual; 545 546 buffer = kmalloc(USBTMC_HEADER_SIZE, GFP_KERNEL); 547 if (!buffer) 548 return -ENOMEM; 549 /* Setup IO buffer for REQUEST_DEV_DEP_MSG_IN message 550 * Refer to class specs for details 551 */ 552 buffer[0] = 2; 553 buffer[1] = data->bTag; 554 buffer[2] = ~data->bTag; 555 buffer[3] = 0; /* Reserved */ 556 buffer[4] = transfer_size >> 0; 557 buffer[5] = transfer_size >> 8; 558 buffer[6] = transfer_size >> 16; 559 buffer[7] = transfer_size >> 24; 560 buffer[8] = data->TermCharEnabled * 2; 561 /* Use term character? */ 562 buffer[9] = data->TermChar; 563 buffer[10] = 0; /* Reserved */ 564 buffer[11] = 0; /* Reserved */ 565 566 /* Send bulk URB */ 567 retval = usb_bulk_msg(data->usb_dev, 568 usb_sndbulkpipe(data->usb_dev, 569 data->bulk_out), 570 buffer, USBTMC_HEADER_SIZE, &actual, USBTMC_TIMEOUT); 571 572 /* Store bTag (in case we need to abort) */ 573 data->bTag_last_write = data->bTag; 574 575 /* Increment bTag -- and increment again if zero */ 576 data->bTag++; 577 if (!data->bTag) 578 data->bTag++; 579 580 kfree(buffer); 581 if (retval < 0) { 582 dev_err(&data->intf->dev, "usb_bulk_msg in send_request_dev_dep_msg_in() returned %d\n", retval); 583 return retval; 584 } 585 586 return 0; 587 } 588 589 static ssize_t usbtmc_read(struct file *filp, char __user *buf, 590 size_t count, loff_t *f_pos) 591 { 592 struct usbtmc_device_data *data; 593 struct device *dev; 594 u32 n_characters; 595 u8 *buffer; 596 int actual; 597 size_t done; 598 size_t remaining; 599 int retval; 600 size_t this_part; 601 602 /* Get pointer to private data structure */ 603 data = filp->private_data; 604 dev = &data->intf->dev; 605 606 buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL); 607 if (!buffer) 608 return -ENOMEM; 609 610 mutex_lock(&data->io_mutex); 611 if (data->zombie) { 612 retval = -ENODEV; 613 goto exit; 614 } 615 616 if (data->rigol_quirk) { 617 dev_dbg(dev, "usb_bulk_msg_in: count(%zu)\n", count); 618 619 retval = send_request_dev_dep_msg_in(data, count); 620 621 if (retval < 0) { 622 if (data->auto_abort) 623 usbtmc_ioctl_abort_bulk_out(data); 624 goto exit; 625 } 626 } 627 628 /* Loop until we have fetched everything we requested */ 629 remaining = count; 630 this_part = remaining; 631 done = 0; 632 633 while (remaining > 0) { 634 if (!data->rigol_quirk) { 635 dev_dbg(dev, "usb_bulk_msg_in: remaining(%zu), count(%zu)\n", remaining, count); 636 637 if (remaining > USBTMC_SIZE_IOBUFFER - USBTMC_HEADER_SIZE - 3) 638 this_part = USBTMC_SIZE_IOBUFFER - USBTMC_HEADER_SIZE - 3; 639 else 640 this_part = remaining; 641 642 retval = send_request_dev_dep_msg_in(data, this_part); 643 if (retval < 0) { 644 dev_err(dev, "usb_bulk_msg returned %d\n", retval); 645 if (data->auto_abort) 646 usbtmc_ioctl_abort_bulk_out(data); 647 goto exit; 648 } 649 } 650 651 /* Send bulk URB */ 652 retval = usb_bulk_msg(data->usb_dev, 653 usb_rcvbulkpipe(data->usb_dev, 654 data->bulk_in), 655 buffer, USBTMC_SIZE_IOBUFFER, &actual, 656 USBTMC_TIMEOUT); 657 658 dev_dbg(dev, "usb_bulk_msg: retval(%u), done(%zu), remaining(%zu), actual(%d)\n", retval, done, remaining, actual); 659 660 /* Store bTag (in case we need to abort) */ 661 data->bTag_last_read = data->bTag; 662 663 if (retval < 0) { 664 dev_dbg(dev, "Unable to read data, error %d\n", retval); 665 if (data->auto_abort) 666 usbtmc_ioctl_abort_bulk_in(data); 667 goto exit; 668 } 669 670 /* Parse header in first packet */ 671 if ((done == 0) || !data->rigol_quirk) { 672 /* Sanity checks for the header */ 673 if (actual < USBTMC_HEADER_SIZE) { 674 dev_err(dev, "Device sent too small first packet: %u < %u\n", actual, USBTMC_HEADER_SIZE); 675 if (data->auto_abort) 676 usbtmc_ioctl_abort_bulk_in(data); 677 goto exit; 678 } 679 680 if (buffer[0] != 2) { 681 dev_err(dev, "Device sent reply with wrong MsgID: %u != 2\n", buffer[0]); 682 if (data->auto_abort) 683 usbtmc_ioctl_abort_bulk_in(data); 684 goto exit; 685 } 686 687 if (buffer[1] != data->bTag_last_write) { 688 dev_err(dev, "Device sent reply with wrong bTag: %u != %u\n", buffer[1], data->bTag_last_write); 689 if (data->auto_abort) 690 usbtmc_ioctl_abort_bulk_in(data); 691 goto exit; 692 } 693 694 /* How many characters did the instrument send? */ 695 n_characters = buffer[4] + 696 (buffer[5] << 8) + 697 (buffer[6] << 16) + 698 (buffer[7] << 24); 699 700 if (n_characters > this_part) { 701 dev_err(dev, "Device wants to return more data than requested: %u > %zu\n", n_characters, count); 702 if (data->auto_abort) 703 usbtmc_ioctl_abort_bulk_in(data); 704 goto exit; 705 } 706 707 /* Remove the USBTMC header */ 708 actual -= USBTMC_HEADER_SIZE; 709 710 /* Check if the message is smaller than requested */ 711 if (data->rigol_quirk) { 712 if (remaining > n_characters) 713 remaining = n_characters; 714 /* Remove padding if it exists */ 715 if (actual > remaining) 716 actual = remaining; 717 } 718 else { 719 if (this_part > n_characters) 720 this_part = n_characters; 721 /* Remove padding if it exists */ 722 if (actual > this_part) 723 actual = this_part; 724 } 725 726 dev_dbg(dev, "Bulk-IN header: N_characters(%u), bTransAttr(%u)\n", n_characters, buffer[8]); 727 728 remaining -= actual; 729 730 /* Terminate if end-of-message bit received from device */ 731 if ((buffer[8] & 0x01) && (actual >= n_characters)) 732 remaining = 0; 733 734 dev_dbg(dev, "Bulk-IN header: remaining(%zu), buf(%p), buffer(%p) done(%zu)\n", remaining,buf,buffer,done); 735 736 737 /* Copy buffer to user space */ 738 if (copy_to_user(buf + done, &buffer[USBTMC_HEADER_SIZE], actual)) { 739 /* There must have been an addressing problem */ 740 retval = -EFAULT; 741 goto exit; 742 } 743 done += actual; 744 } 745 else { 746 if (actual > remaining) 747 actual = remaining; 748 749 remaining -= actual; 750 751 dev_dbg(dev, "Bulk-IN header cont: actual(%u), done(%zu), remaining(%zu), buf(%p), buffer(%p)\n", actual, done, remaining,buf,buffer); 752 753 /* Copy buffer to user space */ 754 if (copy_to_user(buf + done, buffer, actual)) { 755 /* There must have been an addressing problem */ 756 retval = -EFAULT; 757 goto exit; 758 } 759 done += actual; 760 } 761 } 762 763 /* Update file position value */ 764 *f_pos = *f_pos + done; 765 retval = done; 766 767 exit: 768 mutex_unlock(&data->io_mutex); 769 kfree(buffer); 770 return retval; 771 } 772 773 static ssize_t usbtmc_write(struct file *filp, const char __user *buf, 774 size_t count, loff_t *f_pos) 775 { 776 struct usbtmc_device_data *data; 777 u8 *buffer; 778 int retval; 779 int actual; 780 unsigned long int n_bytes; 781 int remaining; 782 int done; 783 int this_part; 784 785 data = filp->private_data; 786 787 buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL); 788 if (!buffer) 789 return -ENOMEM; 790 791 mutex_lock(&data->io_mutex); 792 if (data->zombie) { 793 retval = -ENODEV; 794 goto exit; 795 } 796 797 remaining = count; 798 done = 0; 799 800 while (remaining > 0) { 801 if (remaining > USBTMC_SIZE_IOBUFFER - USBTMC_HEADER_SIZE) { 802 this_part = USBTMC_SIZE_IOBUFFER - USBTMC_HEADER_SIZE; 803 buffer[8] = 0; 804 } else { 805 this_part = remaining; 806 buffer[8] = 1; 807 } 808 809 /* Setup IO buffer for DEV_DEP_MSG_OUT message */ 810 buffer[0] = 1; 811 buffer[1] = data->bTag; 812 buffer[2] = ~data->bTag; 813 buffer[3] = 0; /* Reserved */ 814 buffer[4] = this_part >> 0; 815 buffer[5] = this_part >> 8; 816 buffer[6] = this_part >> 16; 817 buffer[7] = this_part >> 24; 818 /* buffer[8] is set above... */ 819 buffer[9] = 0; /* Reserved */ 820 buffer[10] = 0; /* Reserved */ 821 buffer[11] = 0; /* Reserved */ 822 823 if (copy_from_user(&buffer[USBTMC_HEADER_SIZE], buf + done, this_part)) { 824 retval = -EFAULT; 825 goto exit; 826 } 827 828 n_bytes = roundup(USBTMC_HEADER_SIZE + this_part, 4); 829 memset(buffer + USBTMC_HEADER_SIZE + this_part, 0, n_bytes - (USBTMC_HEADER_SIZE + this_part)); 830 831 do { 832 retval = usb_bulk_msg(data->usb_dev, 833 usb_sndbulkpipe(data->usb_dev, 834 data->bulk_out), 835 buffer, n_bytes, 836 &actual, USBTMC_TIMEOUT); 837 if (retval != 0) 838 break; 839 n_bytes -= actual; 840 } while (n_bytes); 841 842 data->bTag_last_write = data->bTag; 843 data->bTag++; 844 845 if (!data->bTag) 846 data->bTag++; 847 848 if (retval < 0) { 849 dev_err(&data->intf->dev, 850 "Unable to send data, error %d\n", retval); 851 if (data->auto_abort) 852 usbtmc_ioctl_abort_bulk_out(data); 853 goto exit; 854 } 855 856 remaining -= this_part; 857 done += this_part; 858 } 859 860 retval = count; 861 exit: 862 mutex_unlock(&data->io_mutex); 863 kfree(buffer); 864 return retval; 865 } 866 867 static int usbtmc_ioctl_clear(struct usbtmc_device_data *data) 868 { 869 struct usb_host_interface *current_setting; 870 struct usb_endpoint_descriptor *desc; 871 struct device *dev; 872 u8 *buffer; 873 int rv; 874 int n; 875 int actual = 0; 876 int max_size; 877 878 dev = &data->intf->dev; 879 880 dev_dbg(dev, "Sending INITIATE_CLEAR request\n"); 881 882 buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL); 883 if (!buffer) 884 return -ENOMEM; 885 886 rv = usb_control_msg(data->usb_dev, 887 usb_rcvctrlpipe(data->usb_dev, 0), 888 USBTMC_REQUEST_INITIATE_CLEAR, 889 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE, 890 0, 0, buffer, 1, USBTMC_TIMEOUT); 891 if (rv < 0) { 892 dev_err(dev, "usb_control_msg returned %d\n", rv); 893 goto exit; 894 } 895 896 dev_dbg(dev, "INITIATE_CLEAR returned %x\n", buffer[0]); 897 898 if (buffer[0] != USBTMC_STATUS_SUCCESS) { 899 dev_err(dev, "INITIATE_CLEAR returned %x\n", buffer[0]); 900 rv = -EPERM; 901 goto exit; 902 } 903 904 max_size = 0; 905 current_setting = data->intf->cur_altsetting; 906 for (n = 0; n < current_setting->desc.bNumEndpoints; n++) { 907 desc = ¤t_setting->endpoint[n].desc; 908 if (desc->bEndpointAddress == data->bulk_in) 909 max_size = usb_endpoint_maxp(desc); 910 } 911 912 if (max_size == 0) { 913 dev_err(dev, "Couldn't get wMaxPacketSize\n"); 914 rv = -EPERM; 915 goto exit; 916 } 917 918 dev_dbg(dev, "wMaxPacketSize is %d\n", max_size); 919 920 n = 0; 921 922 usbtmc_clear_check_status: 923 924 dev_dbg(dev, "Sending CHECK_CLEAR_STATUS request\n"); 925 926 rv = usb_control_msg(data->usb_dev, 927 usb_rcvctrlpipe(data->usb_dev, 0), 928 USBTMC_REQUEST_CHECK_CLEAR_STATUS, 929 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE, 930 0, 0, buffer, 2, USBTMC_TIMEOUT); 931 if (rv < 0) { 932 dev_err(dev, "usb_control_msg returned %d\n", rv); 933 goto exit; 934 } 935 936 dev_dbg(dev, "CHECK_CLEAR_STATUS returned %x\n", buffer[0]); 937 938 if (buffer[0] == USBTMC_STATUS_SUCCESS) 939 goto usbtmc_clear_bulk_out_halt; 940 941 if (buffer[0] != USBTMC_STATUS_PENDING) { 942 dev_err(dev, "CHECK_CLEAR_STATUS returned %x\n", buffer[0]); 943 rv = -EPERM; 944 goto exit; 945 } 946 947 if (buffer[1] == 1) 948 do { 949 dev_dbg(dev, "Reading from bulk in EP\n"); 950 951 rv = usb_bulk_msg(data->usb_dev, 952 usb_rcvbulkpipe(data->usb_dev, 953 data->bulk_in), 954 buffer, USBTMC_SIZE_IOBUFFER, 955 &actual, USBTMC_TIMEOUT); 956 n++; 957 958 if (rv < 0) { 959 dev_err(dev, "usb_control_msg returned %d\n", 960 rv); 961 goto exit; 962 } 963 } while ((actual == max_size) && 964 (n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN)); 965 966 if (actual == max_size) { 967 dev_err(dev, "Couldn't clear device buffer within %d cycles\n", 968 USBTMC_MAX_READS_TO_CLEAR_BULK_IN); 969 rv = -EPERM; 970 goto exit; 971 } 972 973 goto usbtmc_clear_check_status; 974 975 usbtmc_clear_bulk_out_halt: 976 977 rv = usb_clear_halt(data->usb_dev, 978 usb_sndbulkpipe(data->usb_dev, data->bulk_out)); 979 if (rv < 0) { 980 dev_err(dev, "usb_control_msg returned %d\n", rv); 981 goto exit; 982 } 983 rv = 0; 984 985 exit: 986 kfree(buffer); 987 return rv; 988 } 989 990 static int usbtmc_ioctl_clear_out_halt(struct usbtmc_device_data *data) 991 { 992 int rv; 993 994 rv = usb_clear_halt(data->usb_dev, 995 usb_sndbulkpipe(data->usb_dev, data->bulk_out)); 996 997 if (rv < 0) { 998 dev_err(&data->usb_dev->dev, "usb_control_msg returned %d\n", 999 rv); 1000 return rv; 1001 } 1002 return 0; 1003 } 1004 1005 static int usbtmc_ioctl_clear_in_halt(struct usbtmc_device_data *data) 1006 { 1007 int rv; 1008 1009 rv = usb_clear_halt(data->usb_dev, 1010 usb_rcvbulkpipe(data->usb_dev, data->bulk_in)); 1011 1012 if (rv < 0) { 1013 dev_err(&data->usb_dev->dev, "usb_control_msg returned %d\n", 1014 rv); 1015 return rv; 1016 } 1017 return 0; 1018 } 1019 1020 static int get_capabilities(struct usbtmc_device_data *data) 1021 { 1022 struct device *dev = &data->usb_dev->dev; 1023 char *buffer; 1024 int rv = 0; 1025 1026 buffer = kmalloc(0x18, GFP_KERNEL); 1027 if (!buffer) 1028 return -ENOMEM; 1029 1030 rv = usb_control_msg(data->usb_dev, usb_rcvctrlpipe(data->usb_dev, 0), 1031 USBTMC_REQUEST_GET_CAPABILITIES, 1032 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE, 1033 0, 0, buffer, 0x18, USBTMC_TIMEOUT); 1034 if (rv < 0) { 1035 dev_err(dev, "usb_control_msg returned %d\n", rv); 1036 goto err_out; 1037 } 1038 1039 dev_dbg(dev, "GET_CAPABILITIES returned %x\n", buffer[0]); 1040 if (buffer[0] != USBTMC_STATUS_SUCCESS) { 1041 dev_err(dev, "GET_CAPABILITIES returned %x\n", buffer[0]); 1042 rv = -EPERM; 1043 goto err_out; 1044 } 1045 dev_dbg(dev, "Interface capabilities are %x\n", buffer[4]); 1046 dev_dbg(dev, "Device capabilities are %x\n", buffer[5]); 1047 dev_dbg(dev, "USB488 interface capabilities are %x\n", buffer[14]); 1048 dev_dbg(dev, "USB488 device capabilities are %x\n", buffer[15]); 1049 1050 data->capabilities.interface_capabilities = buffer[4]; 1051 data->capabilities.device_capabilities = buffer[5]; 1052 data->capabilities.usb488_interface_capabilities = buffer[14]; 1053 data->capabilities.usb488_device_capabilities = buffer[15]; 1054 data->usb488_caps = (buffer[14] & 0x07) | ((buffer[15] & 0x0f) << 4); 1055 rv = 0; 1056 1057 err_out: 1058 kfree(buffer); 1059 return rv; 1060 } 1061 1062 #define capability_attribute(name) \ 1063 static ssize_t name##_show(struct device *dev, \ 1064 struct device_attribute *attr, char *buf) \ 1065 { \ 1066 struct usb_interface *intf = to_usb_interface(dev); \ 1067 struct usbtmc_device_data *data = usb_get_intfdata(intf); \ 1068 \ 1069 return sprintf(buf, "%d\n", data->capabilities.name); \ 1070 } \ 1071 static DEVICE_ATTR_RO(name) 1072 1073 capability_attribute(interface_capabilities); 1074 capability_attribute(device_capabilities); 1075 capability_attribute(usb488_interface_capabilities); 1076 capability_attribute(usb488_device_capabilities); 1077 1078 static struct attribute *capability_attrs[] = { 1079 &dev_attr_interface_capabilities.attr, 1080 &dev_attr_device_capabilities.attr, 1081 &dev_attr_usb488_interface_capabilities.attr, 1082 &dev_attr_usb488_device_capabilities.attr, 1083 NULL, 1084 }; 1085 1086 static struct attribute_group capability_attr_grp = { 1087 .attrs = capability_attrs, 1088 }; 1089 1090 static ssize_t TermChar_show(struct device *dev, 1091 struct device_attribute *attr, char *buf) 1092 { 1093 struct usb_interface *intf = to_usb_interface(dev); 1094 struct usbtmc_device_data *data = usb_get_intfdata(intf); 1095 1096 return sprintf(buf, "%c\n", data->TermChar); 1097 } 1098 1099 static ssize_t TermChar_store(struct device *dev, 1100 struct device_attribute *attr, 1101 const char *buf, size_t count) 1102 { 1103 struct usb_interface *intf = to_usb_interface(dev); 1104 struct usbtmc_device_data *data = usb_get_intfdata(intf); 1105 1106 if (count < 1) 1107 return -EINVAL; 1108 data->TermChar = buf[0]; 1109 return count; 1110 } 1111 static DEVICE_ATTR_RW(TermChar); 1112 1113 #define data_attribute(name) \ 1114 static ssize_t name##_show(struct device *dev, \ 1115 struct device_attribute *attr, char *buf) \ 1116 { \ 1117 struct usb_interface *intf = to_usb_interface(dev); \ 1118 struct usbtmc_device_data *data = usb_get_intfdata(intf); \ 1119 \ 1120 return sprintf(buf, "%d\n", data->name); \ 1121 } \ 1122 static ssize_t name##_store(struct device *dev, \ 1123 struct device_attribute *attr, \ 1124 const char *buf, size_t count) \ 1125 { \ 1126 struct usb_interface *intf = to_usb_interface(dev); \ 1127 struct usbtmc_device_data *data = usb_get_intfdata(intf); \ 1128 ssize_t result; \ 1129 unsigned val; \ 1130 \ 1131 result = sscanf(buf, "%u\n", &val); \ 1132 if (result != 1) \ 1133 result = -EINVAL; \ 1134 data->name = val; \ 1135 if (result < 0) \ 1136 return result; \ 1137 else \ 1138 return count; \ 1139 } \ 1140 static DEVICE_ATTR_RW(name) 1141 1142 data_attribute(TermCharEnabled); 1143 data_attribute(auto_abort); 1144 1145 static struct attribute *data_attrs[] = { 1146 &dev_attr_TermChar.attr, 1147 &dev_attr_TermCharEnabled.attr, 1148 &dev_attr_auto_abort.attr, 1149 NULL, 1150 }; 1151 1152 static struct attribute_group data_attr_grp = { 1153 .attrs = data_attrs, 1154 }; 1155 1156 static int usbtmc_ioctl_indicator_pulse(struct usbtmc_device_data *data) 1157 { 1158 struct device *dev; 1159 u8 *buffer; 1160 int rv; 1161 1162 dev = &data->intf->dev; 1163 1164 buffer = kmalloc(2, GFP_KERNEL); 1165 if (!buffer) 1166 return -ENOMEM; 1167 1168 rv = usb_control_msg(data->usb_dev, 1169 usb_rcvctrlpipe(data->usb_dev, 0), 1170 USBTMC_REQUEST_INDICATOR_PULSE, 1171 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE, 1172 0, 0, buffer, 0x01, USBTMC_TIMEOUT); 1173 1174 if (rv < 0) { 1175 dev_err(dev, "usb_control_msg returned %d\n", rv); 1176 goto exit; 1177 } 1178 1179 dev_dbg(dev, "INDICATOR_PULSE returned %x\n", buffer[0]); 1180 1181 if (buffer[0] != USBTMC_STATUS_SUCCESS) { 1182 dev_err(dev, "INDICATOR_PULSE returned %x\n", buffer[0]); 1183 rv = -EPERM; 1184 goto exit; 1185 } 1186 rv = 0; 1187 1188 exit: 1189 kfree(buffer); 1190 return rv; 1191 } 1192 1193 static long usbtmc_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 1194 { 1195 struct usbtmc_device_data *data; 1196 int retval = -EBADRQC; 1197 1198 data = file->private_data; 1199 mutex_lock(&data->io_mutex); 1200 if (data->zombie) { 1201 retval = -ENODEV; 1202 goto skip_io_on_zombie; 1203 } 1204 1205 switch (cmd) { 1206 case USBTMC_IOCTL_CLEAR_OUT_HALT: 1207 retval = usbtmc_ioctl_clear_out_halt(data); 1208 break; 1209 1210 case USBTMC_IOCTL_CLEAR_IN_HALT: 1211 retval = usbtmc_ioctl_clear_in_halt(data); 1212 break; 1213 1214 case USBTMC_IOCTL_INDICATOR_PULSE: 1215 retval = usbtmc_ioctl_indicator_pulse(data); 1216 break; 1217 1218 case USBTMC_IOCTL_CLEAR: 1219 retval = usbtmc_ioctl_clear(data); 1220 break; 1221 1222 case USBTMC_IOCTL_ABORT_BULK_OUT: 1223 retval = usbtmc_ioctl_abort_bulk_out(data); 1224 break; 1225 1226 case USBTMC_IOCTL_ABORT_BULK_IN: 1227 retval = usbtmc_ioctl_abort_bulk_in(data); 1228 break; 1229 1230 case USBTMC488_IOCTL_GET_CAPS: 1231 retval = copy_to_user((void __user *)arg, 1232 &data->usb488_caps, 1233 sizeof(data->usb488_caps)); 1234 if (retval) 1235 retval = -EFAULT; 1236 break; 1237 1238 case USBTMC488_IOCTL_READ_STB: 1239 retval = usbtmc488_ioctl_read_stb(data, (void __user *)arg); 1240 break; 1241 1242 case USBTMC488_IOCTL_REN_CONTROL: 1243 retval = usbtmc488_ioctl_simple(data, (void __user *)arg, 1244 USBTMC488_REQUEST_REN_CONTROL); 1245 break; 1246 1247 case USBTMC488_IOCTL_GOTO_LOCAL: 1248 retval = usbtmc488_ioctl_simple(data, (void __user *)arg, 1249 USBTMC488_REQUEST_GOTO_LOCAL); 1250 break; 1251 1252 case USBTMC488_IOCTL_LOCAL_LOCKOUT: 1253 retval = usbtmc488_ioctl_simple(data, (void __user *)arg, 1254 USBTMC488_REQUEST_LOCAL_LOCKOUT); 1255 break; 1256 } 1257 1258 skip_io_on_zombie: 1259 mutex_unlock(&data->io_mutex); 1260 return retval; 1261 } 1262 1263 static int usbtmc_fasync(int fd, struct file *file, int on) 1264 { 1265 struct usbtmc_device_data *data = file->private_data; 1266 1267 return fasync_helper(fd, file, on, &data->fasync); 1268 } 1269 1270 static unsigned int usbtmc_poll(struct file *file, poll_table *wait) 1271 { 1272 struct usbtmc_device_data *data = file->private_data; 1273 unsigned int mask; 1274 1275 mutex_lock(&data->io_mutex); 1276 1277 if (data->zombie) { 1278 mask = POLLHUP | POLLERR; 1279 goto no_poll; 1280 } 1281 1282 poll_wait(file, &data->waitq, wait); 1283 1284 mask = (atomic_read(&data->srq_asserted)) ? POLLIN | POLLRDNORM : 0; 1285 1286 no_poll: 1287 mutex_unlock(&data->io_mutex); 1288 return mask; 1289 } 1290 1291 static const struct file_operations fops = { 1292 .owner = THIS_MODULE, 1293 .read = usbtmc_read, 1294 .write = usbtmc_write, 1295 .open = usbtmc_open, 1296 .release = usbtmc_release, 1297 .unlocked_ioctl = usbtmc_ioctl, 1298 .fasync = usbtmc_fasync, 1299 .poll = usbtmc_poll, 1300 .llseek = default_llseek, 1301 }; 1302 1303 static struct usb_class_driver usbtmc_class = { 1304 .name = "usbtmc%d", 1305 .fops = &fops, 1306 .minor_base = USBTMC_MINOR_BASE, 1307 }; 1308 1309 static void usbtmc_interrupt(struct urb *urb) 1310 { 1311 struct usbtmc_device_data *data = urb->context; 1312 struct device *dev = &data->intf->dev; 1313 int status = urb->status; 1314 int rv; 1315 1316 dev_dbg(&data->intf->dev, "int status: %d len %d\n", 1317 status, urb->actual_length); 1318 1319 switch (status) { 1320 case 0: /* SUCCESS */ 1321 /* check for valid STB notification */ 1322 if (data->iin_buffer[0] > 0x81) { 1323 data->bNotify1 = data->iin_buffer[0]; 1324 data->bNotify2 = data->iin_buffer[1]; 1325 atomic_set(&data->iin_data_valid, 1); 1326 wake_up_interruptible(&data->waitq); 1327 goto exit; 1328 } 1329 /* check for SRQ notification */ 1330 if (data->iin_buffer[0] == 0x81) { 1331 if (data->fasync) 1332 kill_fasync(&data->fasync, 1333 SIGIO, POLL_IN); 1334 1335 atomic_set(&data->srq_asserted, 1); 1336 wake_up_interruptible(&data->waitq); 1337 goto exit; 1338 } 1339 dev_warn(dev, "invalid notification: %x\n", data->iin_buffer[0]); 1340 break; 1341 case -EOVERFLOW: 1342 dev_err(dev, "overflow with length %d, actual length is %d\n", 1343 data->iin_wMaxPacketSize, urb->actual_length); 1344 case -ECONNRESET: 1345 case -ENOENT: 1346 case -ESHUTDOWN: 1347 case -EILSEQ: 1348 case -ETIME: 1349 /* urb terminated, clean up */ 1350 dev_dbg(dev, "urb terminated, status: %d\n", status); 1351 return; 1352 default: 1353 dev_err(dev, "unknown status received: %d\n", status); 1354 } 1355 exit: 1356 rv = usb_submit_urb(urb, GFP_ATOMIC); 1357 if (rv) 1358 dev_err(dev, "usb_submit_urb failed: %d\n", rv); 1359 } 1360 1361 static void usbtmc_free_int(struct usbtmc_device_data *data) 1362 { 1363 if (!data->iin_ep_present || !data->iin_urb) 1364 return; 1365 usb_kill_urb(data->iin_urb); 1366 kfree(data->iin_buffer); 1367 usb_free_urb(data->iin_urb); 1368 kref_put(&data->kref, usbtmc_delete); 1369 } 1370 1371 static int usbtmc_probe(struct usb_interface *intf, 1372 const struct usb_device_id *id) 1373 { 1374 struct usbtmc_device_data *data; 1375 struct usb_host_interface *iface_desc; 1376 struct usb_endpoint_descriptor *endpoint; 1377 int n; 1378 int retcode; 1379 1380 dev_dbg(&intf->dev, "%s called\n", __func__); 1381 1382 data = devm_kzalloc(&intf->dev, sizeof(*data), GFP_KERNEL); 1383 if (!data) 1384 return -ENOMEM; 1385 1386 data->intf = intf; 1387 data->id = id; 1388 data->usb_dev = usb_get_dev(interface_to_usbdev(intf)); 1389 usb_set_intfdata(intf, data); 1390 kref_init(&data->kref); 1391 mutex_init(&data->io_mutex); 1392 init_waitqueue_head(&data->waitq); 1393 atomic_set(&data->iin_data_valid, 0); 1394 atomic_set(&data->srq_asserted, 0); 1395 data->zombie = 0; 1396 1397 /* Determine if it is a Rigol or not */ 1398 data->rigol_quirk = 0; 1399 dev_dbg(&intf->dev, "Trying to find if device Vendor 0x%04X Product 0x%04X has the RIGOL quirk\n", 1400 le16_to_cpu(data->usb_dev->descriptor.idVendor), 1401 le16_to_cpu(data->usb_dev->descriptor.idProduct)); 1402 for(n = 0; usbtmc_id_quirk[n].idVendor > 0; n++) { 1403 if ((usbtmc_id_quirk[n].idVendor == le16_to_cpu(data->usb_dev->descriptor.idVendor)) && 1404 (usbtmc_id_quirk[n].idProduct == le16_to_cpu(data->usb_dev->descriptor.idProduct))) { 1405 dev_dbg(&intf->dev, "Setting this device as having the RIGOL quirk\n"); 1406 data->rigol_quirk = 1; 1407 break; 1408 } 1409 } 1410 1411 /* Initialize USBTMC bTag and other fields */ 1412 data->bTag = 1; 1413 data->TermCharEnabled = 0; 1414 data->TermChar = '\n'; 1415 /* 2 <= bTag <= 127 USBTMC-USB488 subclass specification 4.3.1 */ 1416 data->iin_bTag = 2; 1417 1418 /* USBTMC devices have only one setting, so use that */ 1419 iface_desc = data->intf->cur_altsetting; 1420 data->ifnum = iface_desc->desc.bInterfaceNumber; 1421 1422 /* Find bulk in endpoint */ 1423 for (n = 0; n < iface_desc->desc.bNumEndpoints; n++) { 1424 endpoint = &iface_desc->endpoint[n].desc; 1425 1426 if (usb_endpoint_is_bulk_in(endpoint)) { 1427 data->bulk_in = endpoint->bEndpointAddress; 1428 dev_dbg(&intf->dev, "Found bulk in endpoint at %u\n", 1429 data->bulk_in); 1430 break; 1431 } 1432 } 1433 1434 /* Find bulk out endpoint */ 1435 for (n = 0; n < iface_desc->desc.bNumEndpoints; n++) { 1436 endpoint = &iface_desc->endpoint[n].desc; 1437 1438 if (usb_endpoint_is_bulk_out(endpoint)) { 1439 data->bulk_out = endpoint->bEndpointAddress; 1440 dev_dbg(&intf->dev, "Found Bulk out endpoint at %u\n", 1441 data->bulk_out); 1442 break; 1443 } 1444 } 1445 /* Find int endpoint */ 1446 for (n = 0; n < iface_desc->desc.bNumEndpoints; n++) { 1447 endpoint = &iface_desc->endpoint[n].desc; 1448 1449 if (usb_endpoint_is_int_in(endpoint)) { 1450 data->iin_ep_present = 1; 1451 data->iin_ep = endpoint->bEndpointAddress; 1452 data->iin_wMaxPacketSize = usb_endpoint_maxp(endpoint); 1453 data->iin_interval = endpoint->bInterval; 1454 dev_dbg(&intf->dev, "Found Int in endpoint at %u\n", 1455 data->iin_ep); 1456 break; 1457 } 1458 } 1459 1460 retcode = get_capabilities(data); 1461 if (retcode) 1462 dev_err(&intf->dev, "can't read capabilities\n"); 1463 else 1464 retcode = sysfs_create_group(&intf->dev.kobj, 1465 &capability_attr_grp); 1466 1467 if (data->iin_ep_present) { 1468 /* allocate int urb */ 1469 data->iin_urb = usb_alloc_urb(0, GFP_KERNEL); 1470 if (!data->iin_urb) { 1471 dev_err(&intf->dev, "Failed to allocate int urb\n"); 1472 goto error_register; 1473 } 1474 1475 /* will reference data in int urb */ 1476 kref_get(&data->kref); 1477 1478 /* allocate buffer for interrupt in */ 1479 data->iin_buffer = kmalloc(data->iin_wMaxPacketSize, 1480 GFP_KERNEL); 1481 if (!data->iin_buffer) { 1482 dev_err(&intf->dev, "Failed to allocate int buf\n"); 1483 goto error_register; 1484 } 1485 1486 /* fill interrupt urb */ 1487 usb_fill_int_urb(data->iin_urb, data->usb_dev, 1488 usb_rcvintpipe(data->usb_dev, data->iin_ep), 1489 data->iin_buffer, data->iin_wMaxPacketSize, 1490 usbtmc_interrupt, 1491 data, data->iin_interval); 1492 1493 retcode = usb_submit_urb(data->iin_urb, GFP_KERNEL); 1494 if (retcode) { 1495 dev_err(&intf->dev, "Failed to submit iin_urb\n"); 1496 goto error_register; 1497 } 1498 } 1499 1500 retcode = sysfs_create_group(&intf->dev.kobj, &data_attr_grp); 1501 1502 retcode = usb_register_dev(intf, &usbtmc_class); 1503 if (retcode) { 1504 dev_err(&intf->dev, "Not able to get a minor" 1505 " (base %u, slice default): %d\n", USBTMC_MINOR_BASE, 1506 retcode); 1507 goto error_register; 1508 } 1509 dev_dbg(&intf->dev, "Using minor number %d\n", intf->minor); 1510 1511 return 0; 1512 1513 error_register: 1514 sysfs_remove_group(&intf->dev.kobj, &capability_attr_grp); 1515 sysfs_remove_group(&intf->dev.kobj, &data_attr_grp); 1516 usbtmc_free_int(data); 1517 kref_put(&data->kref, usbtmc_delete); 1518 return retcode; 1519 } 1520 1521 static void usbtmc_disconnect(struct usb_interface *intf) 1522 { 1523 struct usbtmc_device_data *data; 1524 1525 dev_dbg(&intf->dev, "usbtmc_disconnect called\n"); 1526 1527 data = usb_get_intfdata(intf); 1528 usbtmc_free_int(data); 1529 usb_deregister_dev(intf, &usbtmc_class); 1530 sysfs_remove_group(&intf->dev.kobj, &capability_attr_grp); 1531 sysfs_remove_group(&intf->dev.kobj, &data_attr_grp); 1532 mutex_lock(&data->io_mutex); 1533 data->zombie = 1; 1534 mutex_unlock(&data->io_mutex); 1535 kref_put(&data->kref, usbtmc_delete); 1536 } 1537 1538 static int usbtmc_suspend(struct usb_interface *intf, pm_message_t message) 1539 { 1540 /* this driver does not have pending URBs */ 1541 return 0; 1542 } 1543 1544 static int usbtmc_resume(struct usb_interface *intf) 1545 { 1546 return 0; 1547 } 1548 1549 static struct usb_driver usbtmc_driver = { 1550 .name = "usbtmc", 1551 .id_table = usbtmc_devices, 1552 .probe = usbtmc_probe, 1553 .disconnect = usbtmc_disconnect, 1554 .suspend = usbtmc_suspend, 1555 .resume = usbtmc_resume, 1556 }; 1557 1558 module_usb_driver(usbtmc_driver); 1559 1560 MODULE_LICENSE("GPL"); 1561