Loading...
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/mutex.h>
31#include <linux/usb.h>
32#include <linux/usb/tmc.h>
33
34
35#define RIGOL 1
36#define USBTMC_HEADER_SIZE 12
37#define USBTMC_MINOR_BASE 176
38
39/*
40 * Size of driver internal IO buffer. Must be multiple of 4 and at least as
41 * large as wMaxPacketSize (which is usually 512 bytes).
42 */
43#define USBTMC_SIZE_IOBUFFER 2048
44
45/* Default USB timeout (in milliseconds) */
46#define USBTMC_TIMEOUT 5000
47
48/*
49 * Maximum number of read cycles to empty bulk in endpoint during CLEAR and
50 * ABORT_BULK_IN requests. Ends the loop if (for whatever reason) a short
51 * packet is never read.
52 */
53#define USBTMC_MAX_READS_TO_CLEAR_BULK_IN 100
54
55static const struct usb_device_id usbtmc_devices[] = {
56 { USB_INTERFACE_INFO(USB_CLASS_APP_SPEC, 3, 0), },
57 { USB_INTERFACE_INFO(USB_CLASS_APP_SPEC, 3, 1), },
58 { 0, } /* terminating entry */
59};
60MODULE_DEVICE_TABLE(usb, usbtmc_devices);
61
62/*
63 * This structure is the capabilities for the device
64 * See section 4.2.1.8 of the USBTMC specification,
65 * and section 4.2.2 of the USBTMC usb488 subclass
66 * specification for details.
67 */
68struct usbtmc_dev_capabilities {
69 __u8 interface_capabilities;
70 __u8 device_capabilities;
71 __u8 usb488_interface_capabilities;
72 __u8 usb488_device_capabilities;
73};
74
75/* This structure holds private data for each USBTMC device. One copy is
76 * allocated for each USBTMC device in the driver's probe function.
77 */
78struct usbtmc_device_data {
79 const struct usb_device_id *id;
80 struct usb_device *usb_dev;
81 struct usb_interface *intf;
82
83 unsigned int bulk_in;
84 unsigned int bulk_out;
85
86 u8 bTag;
87 u8 bTag_last_write; /* needed for abort */
88 u8 bTag_last_read; /* needed for abort */
89
90 u8 rigol_quirk;
91
92 /* attributes from the USB TMC spec for this device */
93 u8 TermChar;
94 bool TermCharEnabled;
95 bool auto_abort;
96
97 bool zombie; /* fd of disconnected device */
98
99 struct usbtmc_dev_capabilities capabilities;
100 struct kref kref;
101 struct mutex io_mutex; /* only one i/o function running at a time */
102};
103#define to_usbtmc_data(d) container_of(d, struct usbtmc_device_data, kref)
104
105struct usbtmc_ID_rigol_quirk {
106 __u16 idVendor;
107 __u16 idProduct;
108};
109
110static const struct usbtmc_ID_rigol_quirk usbtmc_id_quirk[] = {
111 { 0x1ab1, 0x0588 },
112 { 0, 0 }
113};
114
115/* Forward declarations */
116static struct usb_driver usbtmc_driver;
117
118static void usbtmc_delete(struct kref *kref)
119{
120 struct usbtmc_device_data *data = to_usbtmc_data(kref);
121
122 usb_put_dev(data->usb_dev);
123}
124
125static int usbtmc_open(struct inode *inode, struct file *filp)
126{
127 struct usb_interface *intf;
128 struct usbtmc_device_data *data;
129 int retval = 0;
130
131 intf = usb_find_interface(&usbtmc_driver, iminor(inode));
132 if (!intf) {
133 pr_err("can not find device for minor %d", iminor(inode));
134 return -ENODEV;
135 }
136
137 data = usb_get_intfdata(intf);
138 kref_get(&data->kref);
139
140 /* Store pointer in file structure's private data field */
141 filp->private_data = data;
142
143 return retval;
144}
145
146static int usbtmc_release(struct inode *inode, struct file *file)
147{
148 struct usbtmc_device_data *data = file->private_data;
149
150 kref_put(&data->kref, usbtmc_delete);
151 return 0;
152}
153
154static int usbtmc_ioctl_abort_bulk_in(struct usbtmc_device_data *data)
155{
156 u8 *buffer;
157 struct device *dev;
158 int rv;
159 int n;
160 int actual;
161 struct usb_host_interface *current_setting;
162 int max_size;
163
164 dev = &data->intf->dev;
165 buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL);
166 if (!buffer)
167 return -ENOMEM;
168
169 rv = usb_control_msg(data->usb_dev,
170 usb_rcvctrlpipe(data->usb_dev, 0),
171 USBTMC_REQUEST_INITIATE_ABORT_BULK_IN,
172 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT,
173 data->bTag_last_read, data->bulk_in,
174 buffer, 2, USBTMC_TIMEOUT);
175
176 if (rv < 0) {
177 dev_err(dev, "usb_control_msg returned %d\n", rv);
178 goto exit;
179 }
180
181 dev_dbg(dev, "INITIATE_ABORT_BULK_IN returned %x\n", buffer[0]);
182
183 if (buffer[0] == USBTMC_STATUS_FAILED) {
184 rv = 0;
185 goto exit;
186 }
187
188 if (buffer[0] != USBTMC_STATUS_SUCCESS) {
189 dev_err(dev, "INITIATE_ABORT_BULK_IN returned %x\n",
190 buffer[0]);
191 rv = -EPERM;
192 goto exit;
193 }
194
195 max_size = 0;
196 current_setting = data->intf->cur_altsetting;
197 for (n = 0; n < current_setting->desc.bNumEndpoints; n++)
198 if (current_setting->endpoint[n].desc.bEndpointAddress ==
199 data->bulk_in)
200 max_size = usb_endpoint_maxp(¤t_setting->endpoint[n].desc);
201
202 if (max_size == 0) {
203 dev_err(dev, "Couldn't get wMaxPacketSize\n");
204 rv = -EPERM;
205 goto exit;
206 }
207
208 dev_dbg(&data->intf->dev, "wMaxPacketSize is %d\n", max_size);
209
210 n = 0;
211
212 do {
213 dev_dbg(dev, "Reading from bulk in EP\n");
214
215 rv = usb_bulk_msg(data->usb_dev,
216 usb_rcvbulkpipe(data->usb_dev,
217 data->bulk_in),
218 buffer, USBTMC_SIZE_IOBUFFER,
219 &actual, USBTMC_TIMEOUT);
220
221 n++;
222
223 if (rv < 0) {
224 dev_err(dev, "usb_bulk_msg returned %d\n", rv);
225 goto exit;
226 }
227 } while ((actual == max_size) &&
228 (n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN));
229
230 if (actual == max_size) {
231 dev_err(dev, "Couldn't clear device buffer within %d cycles\n",
232 USBTMC_MAX_READS_TO_CLEAR_BULK_IN);
233 rv = -EPERM;
234 goto exit;
235 }
236
237 n = 0;
238
239usbtmc_abort_bulk_in_status:
240 rv = usb_control_msg(data->usb_dev,
241 usb_rcvctrlpipe(data->usb_dev, 0),
242 USBTMC_REQUEST_CHECK_ABORT_BULK_IN_STATUS,
243 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT,
244 0, data->bulk_in, buffer, 0x08,
245 USBTMC_TIMEOUT);
246
247 if (rv < 0) {
248 dev_err(dev, "usb_control_msg returned %d\n", rv);
249 goto exit;
250 }
251
252 dev_dbg(dev, "INITIATE_ABORT_BULK_IN returned %x\n", buffer[0]);
253
254 if (buffer[0] == USBTMC_STATUS_SUCCESS) {
255 rv = 0;
256 goto exit;
257 }
258
259 if (buffer[0] != USBTMC_STATUS_PENDING) {
260 dev_err(dev, "INITIATE_ABORT_BULK_IN returned %x\n", buffer[0]);
261 rv = -EPERM;
262 goto exit;
263 }
264
265 if (buffer[1] == 1)
266 do {
267 dev_dbg(dev, "Reading from bulk in EP\n");
268
269 rv = usb_bulk_msg(data->usb_dev,
270 usb_rcvbulkpipe(data->usb_dev,
271 data->bulk_in),
272 buffer, USBTMC_SIZE_IOBUFFER,
273 &actual, USBTMC_TIMEOUT);
274
275 n++;
276
277 if (rv < 0) {
278 dev_err(dev, "usb_bulk_msg returned %d\n", rv);
279 goto exit;
280 }
281 } while ((actual == max_size) &&
282 (n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN));
283
284 if (actual == max_size) {
285 dev_err(dev, "Couldn't clear device buffer within %d cycles\n",
286 USBTMC_MAX_READS_TO_CLEAR_BULK_IN);
287 rv = -EPERM;
288 goto exit;
289 }
290
291 goto usbtmc_abort_bulk_in_status;
292
293exit:
294 kfree(buffer);
295 return rv;
296
297}
298
299static int usbtmc_ioctl_abort_bulk_out(struct usbtmc_device_data *data)
300{
301 struct device *dev;
302 u8 *buffer;
303 int rv;
304 int n;
305
306 dev = &data->intf->dev;
307
308 buffer = kmalloc(8, GFP_KERNEL);
309 if (!buffer)
310 return -ENOMEM;
311
312 rv = usb_control_msg(data->usb_dev,
313 usb_rcvctrlpipe(data->usb_dev, 0),
314 USBTMC_REQUEST_INITIATE_ABORT_BULK_OUT,
315 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT,
316 data->bTag_last_write, data->bulk_out,
317 buffer, 2, USBTMC_TIMEOUT);
318
319 if (rv < 0) {
320 dev_err(dev, "usb_control_msg returned %d\n", rv);
321 goto exit;
322 }
323
324 dev_dbg(dev, "INITIATE_ABORT_BULK_OUT returned %x\n", buffer[0]);
325
326 if (buffer[0] != USBTMC_STATUS_SUCCESS) {
327 dev_err(dev, "INITIATE_ABORT_BULK_OUT returned %x\n",
328 buffer[0]);
329 rv = -EPERM;
330 goto exit;
331 }
332
333 n = 0;
334
335usbtmc_abort_bulk_out_check_status:
336 rv = usb_control_msg(data->usb_dev,
337 usb_rcvctrlpipe(data->usb_dev, 0),
338 USBTMC_REQUEST_CHECK_ABORT_BULK_OUT_STATUS,
339 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT,
340 0, data->bulk_out, buffer, 0x08,
341 USBTMC_TIMEOUT);
342 n++;
343 if (rv < 0) {
344 dev_err(dev, "usb_control_msg returned %d\n", rv);
345 goto exit;
346 }
347
348 dev_dbg(dev, "CHECK_ABORT_BULK_OUT returned %x\n", buffer[0]);
349
350 if (buffer[0] == USBTMC_STATUS_SUCCESS)
351 goto usbtmc_abort_bulk_out_clear_halt;
352
353 if ((buffer[0] == USBTMC_STATUS_PENDING) &&
354 (n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN))
355 goto usbtmc_abort_bulk_out_check_status;
356
357 rv = -EPERM;
358 goto exit;
359
360usbtmc_abort_bulk_out_clear_halt:
361 rv = usb_clear_halt(data->usb_dev,
362 usb_sndbulkpipe(data->usb_dev, data->bulk_out));
363
364 if (rv < 0) {
365 dev_err(dev, "usb_control_msg returned %d\n", rv);
366 goto exit;
367 }
368 rv = 0;
369
370exit:
371 kfree(buffer);
372 return rv;
373}
374
375/*
376 * Sends a REQUEST_DEV_DEP_MSG_IN message on the Bulk-IN endpoint.
377 * @transfer_size: number of bytes to request from the device.
378 *
379 * See the USBTMC specification, Table 4.
380 *
381 * Also updates bTag_last_write.
382 */
383static int send_request_dev_dep_msg_in(struct usbtmc_device_data *data, size_t transfer_size)
384{
385 int retval;
386 u8 buffer[USBTMC_HEADER_SIZE];
387 int actual;
388
389 /* Setup IO buffer for REQUEST_DEV_DEP_MSG_IN message
390 * Refer to class specs for details
391 */
392 buffer[0] = 2;
393 buffer[1] = data->bTag;
394 buffer[2] = ~data->bTag;
395 buffer[3] = 0; /* Reserved */
396 buffer[4] = transfer_size >> 0;
397 buffer[5] = transfer_size >> 8;
398 buffer[6] = transfer_size >> 16;
399 buffer[7] = transfer_size >> 24;
400 buffer[8] = data->TermCharEnabled * 2;
401 /* Use term character? */
402 buffer[9] = data->TermChar;
403 buffer[10] = 0; /* Reserved */
404 buffer[11] = 0; /* Reserved */
405
406 /* Send bulk URB */
407 retval = usb_bulk_msg(data->usb_dev,
408 usb_sndbulkpipe(data->usb_dev,
409 data->bulk_out),
410 buffer, USBTMC_HEADER_SIZE, &actual, USBTMC_TIMEOUT);
411
412 /* Store bTag (in case we need to abort) */
413 data->bTag_last_write = data->bTag;
414
415 /* Increment bTag -- and increment again if zero */
416 data->bTag++;
417 if (!data->bTag)
418 data->bTag++;
419
420 if (retval < 0) {
421 dev_err(&data->intf->dev, "usb_bulk_msg in send_request_dev_dep_msg_in() returned %d\n", retval);
422 return retval;
423 }
424
425 return 0;
426}
427
428static ssize_t usbtmc_read(struct file *filp, char __user *buf,
429 size_t count, loff_t *f_pos)
430{
431 struct usbtmc_device_data *data;
432 struct device *dev;
433 u32 n_characters;
434 u8 *buffer;
435 int actual;
436 size_t done;
437 size_t remaining;
438 int retval;
439 size_t this_part;
440
441 /* Get pointer to private data structure */
442 data = filp->private_data;
443 dev = &data->intf->dev;
444
445 buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL);
446 if (!buffer)
447 return -ENOMEM;
448
449 mutex_lock(&data->io_mutex);
450 if (data->zombie) {
451 retval = -ENODEV;
452 goto exit;
453 }
454
455 if (data->rigol_quirk) {
456 dev_dbg(dev, "usb_bulk_msg_in: count(%zu)\n", count);
457
458 retval = send_request_dev_dep_msg_in(data, count);
459
460 if (retval < 0) {
461 if (data->auto_abort)
462 usbtmc_ioctl_abort_bulk_out(data);
463 goto exit;
464 }
465 }
466
467 /* Loop until we have fetched everything we requested */
468 remaining = count;
469 this_part = remaining;
470 done = 0;
471
472 while (remaining > 0) {
473 if (!data->rigol_quirk) {
474 dev_dbg(dev, "usb_bulk_msg_in: remaining(%zu), count(%zu)\n", remaining, count);
475
476 if (remaining > USBTMC_SIZE_IOBUFFER - USBTMC_HEADER_SIZE - 3)
477 this_part = USBTMC_SIZE_IOBUFFER - USBTMC_HEADER_SIZE - 3;
478 else
479 this_part = remaining;
480
481 retval = send_request_dev_dep_msg_in(data, this_part);
482 if (retval < 0) {
483 dev_err(dev, "usb_bulk_msg returned %d\n", retval);
484 if (data->auto_abort)
485 usbtmc_ioctl_abort_bulk_out(data);
486 goto exit;
487 }
488 }
489
490 /* Send bulk URB */
491 retval = usb_bulk_msg(data->usb_dev,
492 usb_rcvbulkpipe(data->usb_dev,
493 data->bulk_in),
494 buffer, USBTMC_SIZE_IOBUFFER, &actual,
495 USBTMC_TIMEOUT);
496
497 dev_dbg(dev, "usb_bulk_msg: retval(%u), done(%zu), remaining(%zu), actual(%d)\n", retval, done, remaining, actual);
498
499 /* Store bTag (in case we need to abort) */
500 data->bTag_last_read = data->bTag;
501
502 if (retval < 0) {
503 dev_dbg(dev, "Unable to read data, error %d\n", retval);
504 if (data->auto_abort)
505 usbtmc_ioctl_abort_bulk_in(data);
506 goto exit;
507 }
508
509 /* Parse header in first packet */
510 if ((done == 0) || !data->rigol_quirk) {
511 /* Sanity checks for the header */
512 if (actual < USBTMC_HEADER_SIZE) {
513 dev_err(dev, "Device sent too small first packet: %u < %u\n", actual, USBTMC_HEADER_SIZE);
514 if (data->auto_abort)
515 usbtmc_ioctl_abort_bulk_in(data);
516 goto exit;
517 }
518
519 if (buffer[0] != 2) {
520 dev_err(dev, "Device sent reply with wrong MsgID: %u != 2\n", buffer[0]);
521 if (data->auto_abort)
522 usbtmc_ioctl_abort_bulk_in(data);
523 goto exit;
524 }
525
526 if (buffer[1] != data->bTag_last_write) {
527 dev_err(dev, "Device sent reply with wrong bTag: %u != %u\n", buffer[1], data->bTag_last_write);
528 if (data->auto_abort)
529 usbtmc_ioctl_abort_bulk_in(data);
530 goto exit;
531 }
532
533 /* How many characters did the instrument send? */
534 n_characters = buffer[4] +
535 (buffer[5] << 8) +
536 (buffer[6] << 16) +
537 (buffer[7] << 24);
538
539 if (n_characters > this_part) {
540 dev_err(dev, "Device wants to return more data than requested: %u > %zu\n", n_characters, count);
541 if (data->auto_abort)
542 usbtmc_ioctl_abort_bulk_in(data);
543 goto exit;
544 }
545
546 /* Remove the USBTMC header */
547 actual -= USBTMC_HEADER_SIZE;
548
549 /* Check if the message is smaller than requested */
550 if (data->rigol_quirk) {
551 if (remaining > n_characters)
552 remaining = n_characters;
553 /* Remove padding if it exists */
554 if (actual > remaining)
555 actual = remaining;
556 }
557 else {
558 if (this_part > n_characters)
559 this_part = n_characters;
560 /* Remove padding if it exists */
561 if (actual > this_part)
562 actual = this_part;
563 }
564
565 dev_dbg(dev, "Bulk-IN header: N_characters(%u), bTransAttr(%u)\n", n_characters, buffer[8]);
566
567 remaining -= actual;
568
569 /* Terminate if end-of-message bit received from device */
570 if ((buffer[8] & 0x01) && (actual >= n_characters))
571 remaining = 0;
572
573 dev_dbg(dev, "Bulk-IN header: remaining(%zu), buf(%p), buffer(%p) done(%zu)\n", remaining,buf,buffer,done);
574
575
576 /* Copy buffer to user space */
577 if (copy_to_user(buf + done, &buffer[USBTMC_HEADER_SIZE], actual)) {
578 /* There must have been an addressing problem */
579 retval = -EFAULT;
580 goto exit;
581 }
582 done += actual;
583 }
584 else {
585 if (actual > remaining)
586 actual = remaining;
587
588 remaining -= actual;
589
590 dev_dbg(dev, "Bulk-IN header cont: actual(%u), done(%zu), remaining(%zu), buf(%p), buffer(%p)\n", actual, done, remaining,buf,buffer);
591
592 /* Copy buffer to user space */
593 if (copy_to_user(buf + done, buffer, actual)) {
594 /* There must have been an addressing problem */
595 retval = -EFAULT;
596 goto exit;
597 }
598 done += actual;
599 }
600 }
601
602 /* Update file position value */
603 *f_pos = *f_pos + done;
604 retval = done;
605
606exit:
607 mutex_unlock(&data->io_mutex);
608 kfree(buffer);
609 return retval;
610}
611
612static ssize_t usbtmc_write(struct file *filp, const char __user *buf,
613 size_t count, loff_t *f_pos)
614{
615 struct usbtmc_device_data *data;
616 u8 *buffer;
617 int retval;
618 int actual;
619 unsigned long int n_bytes;
620 int remaining;
621 int done;
622 int this_part;
623
624 data = filp->private_data;
625
626 buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL);
627 if (!buffer)
628 return -ENOMEM;
629
630 mutex_lock(&data->io_mutex);
631 if (data->zombie) {
632 retval = -ENODEV;
633 goto exit;
634 }
635
636 remaining = count;
637 done = 0;
638
639 while (remaining > 0) {
640 if (remaining > USBTMC_SIZE_IOBUFFER - USBTMC_HEADER_SIZE) {
641 this_part = USBTMC_SIZE_IOBUFFER - USBTMC_HEADER_SIZE;
642 buffer[8] = 0;
643 } else {
644 this_part = remaining;
645 buffer[8] = 1;
646 }
647
648 /* Setup IO buffer for DEV_DEP_MSG_OUT message */
649 buffer[0] = 1;
650 buffer[1] = data->bTag;
651 buffer[2] = ~data->bTag;
652 buffer[3] = 0; /* Reserved */
653 buffer[4] = this_part >> 0;
654 buffer[5] = this_part >> 8;
655 buffer[6] = this_part >> 16;
656 buffer[7] = this_part >> 24;
657 /* buffer[8] is set above... */
658 buffer[9] = 0; /* Reserved */
659 buffer[10] = 0; /* Reserved */
660 buffer[11] = 0; /* Reserved */
661
662 if (copy_from_user(&buffer[USBTMC_HEADER_SIZE], buf + done, this_part)) {
663 retval = -EFAULT;
664 goto exit;
665 }
666
667 n_bytes = roundup(USBTMC_HEADER_SIZE + this_part, 4);
668 memset(buffer + USBTMC_HEADER_SIZE + this_part, 0, n_bytes - (USBTMC_HEADER_SIZE + this_part));
669
670 do {
671 retval = usb_bulk_msg(data->usb_dev,
672 usb_sndbulkpipe(data->usb_dev,
673 data->bulk_out),
674 buffer, n_bytes,
675 &actual, USBTMC_TIMEOUT);
676 if (retval != 0)
677 break;
678 n_bytes -= actual;
679 } while (n_bytes);
680
681 data->bTag_last_write = data->bTag;
682 data->bTag++;
683
684 if (!data->bTag)
685 data->bTag++;
686
687 if (retval < 0) {
688 dev_err(&data->intf->dev,
689 "Unable to send data, error %d\n", retval);
690 if (data->auto_abort)
691 usbtmc_ioctl_abort_bulk_out(data);
692 goto exit;
693 }
694
695 remaining -= this_part;
696 done += this_part;
697 }
698
699 retval = count;
700exit:
701 mutex_unlock(&data->io_mutex);
702 kfree(buffer);
703 return retval;
704}
705
706static int usbtmc_ioctl_clear(struct usbtmc_device_data *data)
707{
708 struct usb_host_interface *current_setting;
709 struct usb_endpoint_descriptor *desc;
710 struct device *dev;
711 u8 *buffer;
712 int rv;
713 int n;
714 int actual;
715 int max_size;
716
717 dev = &data->intf->dev;
718
719 dev_dbg(dev, "Sending INITIATE_CLEAR request\n");
720
721 buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL);
722 if (!buffer)
723 return -ENOMEM;
724
725 rv = usb_control_msg(data->usb_dev,
726 usb_rcvctrlpipe(data->usb_dev, 0),
727 USBTMC_REQUEST_INITIATE_CLEAR,
728 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
729 0, 0, buffer, 1, USBTMC_TIMEOUT);
730 if (rv < 0) {
731 dev_err(dev, "usb_control_msg returned %d\n", rv);
732 goto exit;
733 }
734
735 dev_dbg(dev, "INITIATE_CLEAR returned %x\n", buffer[0]);
736
737 if (buffer[0] != USBTMC_STATUS_SUCCESS) {
738 dev_err(dev, "INITIATE_CLEAR returned %x\n", buffer[0]);
739 rv = -EPERM;
740 goto exit;
741 }
742
743 max_size = 0;
744 current_setting = data->intf->cur_altsetting;
745 for (n = 0; n < current_setting->desc.bNumEndpoints; n++) {
746 desc = ¤t_setting->endpoint[n].desc;
747 if (desc->bEndpointAddress == data->bulk_in)
748 max_size = usb_endpoint_maxp(desc);
749 }
750
751 if (max_size == 0) {
752 dev_err(dev, "Couldn't get wMaxPacketSize\n");
753 rv = -EPERM;
754 goto exit;
755 }
756
757 dev_dbg(dev, "wMaxPacketSize is %d\n", max_size);
758
759 n = 0;
760
761usbtmc_clear_check_status:
762
763 dev_dbg(dev, "Sending CHECK_CLEAR_STATUS request\n");
764
765 rv = usb_control_msg(data->usb_dev,
766 usb_rcvctrlpipe(data->usb_dev, 0),
767 USBTMC_REQUEST_CHECK_CLEAR_STATUS,
768 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
769 0, 0, buffer, 2, USBTMC_TIMEOUT);
770 if (rv < 0) {
771 dev_err(dev, "usb_control_msg returned %d\n", rv);
772 goto exit;
773 }
774
775 dev_dbg(dev, "CHECK_CLEAR_STATUS returned %x\n", buffer[0]);
776
777 if (buffer[0] == USBTMC_STATUS_SUCCESS)
778 goto usbtmc_clear_bulk_out_halt;
779
780 if (buffer[0] != USBTMC_STATUS_PENDING) {
781 dev_err(dev, "CHECK_CLEAR_STATUS returned %x\n", buffer[0]);
782 rv = -EPERM;
783 goto exit;
784 }
785
786 if (buffer[1] == 1)
787 do {
788 dev_dbg(dev, "Reading from bulk in EP\n");
789
790 rv = usb_bulk_msg(data->usb_dev,
791 usb_rcvbulkpipe(data->usb_dev,
792 data->bulk_in),
793 buffer, USBTMC_SIZE_IOBUFFER,
794 &actual, USBTMC_TIMEOUT);
795 n++;
796
797 if (rv < 0) {
798 dev_err(dev, "usb_control_msg returned %d\n",
799 rv);
800 goto exit;
801 }
802 } while ((actual == max_size) &&
803 (n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN));
804
805 if (actual == max_size) {
806 dev_err(dev, "Couldn't clear device buffer within %d cycles\n",
807 USBTMC_MAX_READS_TO_CLEAR_BULK_IN);
808 rv = -EPERM;
809 goto exit;
810 }
811
812 goto usbtmc_clear_check_status;
813
814usbtmc_clear_bulk_out_halt:
815
816 rv = usb_clear_halt(data->usb_dev,
817 usb_sndbulkpipe(data->usb_dev, data->bulk_out));
818 if (rv < 0) {
819 dev_err(dev, "usb_control_msg returned %d\n", rv);
820 goto exit;
821 }
822 rv = 0;
823
824exit:
825 kfree(buffer);
826 return rv;
827}
828
829static int usbtmc_ioctl_clear_out_halt(struct usbtmc_device_data *data)
830{
831 int rv;
832
833 rv = usb_clear_halt(data->usb_dev,
834 usb_sndbulkpipe(data->usb_dev, data->bulk_out));
835
836 if (rv < 0) {
837 dev_err(&data->usb_dev->dev, "usb_control_msg returned %d\n",
838 rv);
839 return rv;
840 }
841 return 0;
842}
843
844static int usbtmc_ioctl_clear_in_halt(struct usbtmc_device_data *data)
845{
846 int rv;
847
848 rv = usb_clear_halt(data->usb_dev,
849 usb_rcvbulkpipe(data->usb_dev, data->bulk_in));
850
851 if (rv < 0) {
852 dev_err(&data->usb_dev->dev, "usb_control_msg returned %d\n",
853 rv);
854 return rv;
855 }
856 return 0;
857}
858
859static int get_capabilities(struct usbtmc_device_data *data)
860{
861 struct device *dev = &data->usb_dev->dev;
862 char *buffer;
863 int rv = 0;
864
865 buffer = kmalloc(0x18, GFP_KERNEL);
866 if (!buffer)
867 return -ENOMEM;
868
869 rv = usb_control_msg(data->usb_dev, usb_rcvctrlpipe(data->usb_dev, 0),
870 USBTMC_REQUEST_GET_CAPABILITIES,
871 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
872 0, 0, buffer, 0x18, USBTMC_TIMEOUT);
873 if (rv < 0) {
874 dev_err(dev, "usb_control_msg returned %d\n", rv);
875 goto err_out;
876 }
877
878 dev_dbg(dev, "GET_CAPABILITIES returned %x\n", buffer[0]);
879 if (buffer[0] != USBTMC_STATUS_SUCCESS) {
880 dev_err(dev, "GET_CAPABILITIES returned %x\n", buffer[0]);
881 rv = -EPERM;
882 goto err_out;
883 }
884 dev_dbg(dev, "Interface capabilities are %x\n", buffer[4]);
885 dev_dbg(dev, "Device capabilities are %x\n", buffer[5]);
886 dev_dbg(dev, "USB488 interface capabilities are %x\n", buffer[14]);
887 dev_dbg(dev, "USB488 device capabilities are %x\n", buffer[15]);
888
889 data->capabilities.interface_capabilities = buffer[4];
890 data->capabilities.device_capabilities = buffer[5];
891 data->capabilities.usb488_interface_capabilities = buffer[14];
892 data->capabilities.usb488_device_capabilities = buffer[15];
893 rv = 0;
894
895err_out:
896 kfree(buffer);
897 return rv;
898}
899
900#define capability_attribute(name) \
901static ssize_t name##_show(struct device *dev, \
902 struct device_attribute *attr, char *buf) \
903{ \
904 struct usb_interface *intf = to_usb_interface(dev); \
905 struct usbtmc_device_data *data = usb_get_intfdata(intf); \
906 \
907 return sprintf(buf, "%d\n", data->capabilities.name); \
908} \
909static DEVICE_ATTR_RO(name)
910
911capability_attribute(interface_capabilities);
912capability_attribute(device_capabilities);
913capability_attribute(usb488_interface_capabilities);
914capability_attribute(usb488_device_capabilities);
915
916static struct attribute *capability_attrs[] = {
917 &dev_attr_interface_capabilities.attr,
918 &dev_attr_device_capabilities.attr,
919 &dev_attr_usb488_interface_capabilities.attr,
920 &dev_attr_usb488_device_capabilities.attr,
921 NULL,
922};
923
924static struct attribute_group capability_attr_grp = {
925 .attrs = capability_attrs,
926};
927
928static ssize_t TermChar_show(struct device *dev,
929 struct device_attribute *attr, char *buf)
930{
931 struct usb_interface *intf = to_usb_interface(dev);
932 struct usbtmc_device_data *data = usb_get_intfdata(intf);
933
934 return sprintf(buf, "%c\n", data->TermChar);
935}
936
937static ssize_t TermChar_store(struct device *dev,
938 struct device_attribute *attr,
939 const char *buf, size_t count)
940{
941 struct usb_interface *intf = to_usb_interface(dev);
942 struct usbtmc_device_data *data = usb_get_intfdata(intf);
943
944 if (count < 1)
945 return -EINVAL;
946 data->TermChar = buf[0];
947 return count;
948}
949static DEVICE_ATTR_RW(TermChar);
950
951#define data_attribute(name) \
952static ssize_t name##_show(struct device *dev, \
953 struct device_attribute *attr, char *buf) \
954{ \
955 struct usb_interface *intf = to_usb_interface(dev); \
956 struct usbtmc_device_data *data = usb_get_intfdata(intf); \
957 \
958 return sprintf(buf, "%d\n", data->name); \
959} \
960static ssize_t name##_store(struct device *dev, \
961 struct device_attribute *attr, \
962 const char *buf, size_t count) \
963{ \
964 struct usb_interface *intf = to_usb_interface(dev); \
965 struct usbtmc_device_data *data = usb_get_intfdata(intf); \
966 ssize_t result; \
967 unsigned val; \
968 \
969 result = sscanf(buf, "%u\n", &val); \
970 if (result != 1) \
971 result = -EINVAL; \
972 data->name = val; \
973 if (result < 0) \
974 return result; \
975 else \
976 return count; \
977} \
978static DEVICE_ATTR_RW(name)
979
980data_attribute(TermCharEnabled);
981data_attribute(auto_abort);
982
983static struct attribute *data_attrs[] = {
984 &dev_attr_TermChar.attr,
985 &dev_attr_TermCharEnabled.attr,
986 &dev_attr_auto_abort.attr,
987 NULL,
988};
989
990static struct attribute_group data_attr_grp = {
991 .attrs = data_attrs,
992};
993
994static int usbtmc_ioctl_indicator_pulse(struct usbtmc_device_data *data)
995{
996 struct device *dev;
997 u8 *buffer;
998 int rv;
999
1000 dev = &data->intf->dev;
1001
1002 buffer = kmalloc(2, GFP_KERNEL);
1003 if (!buffer)
1004 return -ENOMEM;
1005
1006 rv = usb_control_msg(data->usb_dev,
1007 usb_rcvctrlpipe(data->usb_dev, 0),
1008 USBTMC_REQUEST_INDICATOR_PULSE,
1009 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
1010 0, 0, buffer, 0x01, USBTMC_TIMEOUT);
1011
1012 if (rv < 0) {
1013 dev_err(dev, "usb_control_msg returned %d\n", rv);
1014 goto exit;
1015 }
1016
1017 dev_dbg(dev, "INDICATOR_PULSE returned %x\n", buffer[0]);
1018
1019 if (buffer[0] != USBTMC_STATUS_SUCCESS) {
1020 dev_err(dev, "INDICATOR_PULSE returned %x\n", buffer[0]);
1021 rv = -EPERM;
1022 goto exit;
1023 }
1024 rv = 0;
1025
1026exit:
1027 kfree(buffer);
1028 return rv;
1029}
1030
1031static long usbtmc_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1032{
1033 struct usbtmc_device_data *data;
1034 int retval = -EBADRQC;
1035
1036 data = file->private_data;
1037 mutex_lock(&data->io_mutex);
1038 if (data->zombie) {
1039 retval = -ENODEV;
1040 goto skip_io_on_zombie;
1041 }
1042
1043 switch (cmd) {
1044 case USBTMC_IOCTL_CLEAR_OUT_HALT:
1045 retval = usbtmc_ioctl_clear_out_halt(data);
1046 break;
1047
1048 case USBTMC_IOCTL_CLEAR_IN_HALT:
1049 retval = usbtmc_ioctl_clear_in_halt(data);
1050 break;
1051
1052 case USBTMC_IOCTL_INDICATOR_PULSE:
1053 retval = usbtmc_ioctl_indicator_pulse(data);
1054 break;
1055
1056 case USBTMC_IOCTL_CLEAR:
1057 retval = usbtmc_ioctl_clear(data);
1058 break;
1059
1060 case USBTMC_IOCTL_ABORT_BULK_OUT:
1061 retval = usbtmc_ioctl_abort_bulk_out(data);
1062 break;
1063
1064 case USBTMC_IOCTL_ABORT_BULK_IN:
1065 retval = usbtmc_ioctl_abort_bulk_in(data);
1066 break;
1067 }
1068
1069skip_io_on_zombie:
1070 mutex_unlock(&data->io_mutex);
1071 return retval;
1072}
1073
1074static const struct file_operations fops = {
1075 .owner = THIS_MODULE,
1076 .read = usbtmc_read,
1077 .write = usbtmc_write,
1078 .open = usbtmc_open,
1079 .release = usbtmc_release,
1080 .unlocked_ioctl = usbtmc_ioctl,
1081 .llseek = default_llseek,
1082};
1083
1084static struct usb_class_driver usbtmc_class = {
1085 .name = "usbtmc%d",
1086 .fops = &fops,
1087 .minor_base = USBTMC_MINOR_BASE,
1088};
1089
1090
1091static int usbtmc_probe(struct usb_interface *intf,
1092 const struct usb_device_id *id)
1093{
1094 struct usbtmc_device_data *data;
1095 struct usb_host_interface *iface_desc;
1096 struct usb_endpoint_descriptor *endpoint;
1097 int n;
1098 int retcode;
1099
1100 dev_dbg(&intf->dev, "%s called\n", __func__);
1101
1102 data = devm_kzalloc(&intf->dev, sizeof(*data), GFP_KERNEL);
1103 if (!data) {
1104 dev_err(&intf->dev, "Unable to allocate kernel memory\n");
1105 return -ENOMEM;
1106 }
1107
1108 data->intf = intf;
1109 data->id = id;
1110 data->usb_dev = usb_get_dev(interface_to_usbdev(intf));
1111 usb_set_intfdata(intf, data);
1112 kref_init(&data->kref);
1113 mutex_init(&data->io_mutex);
1114 data->zombie = 0;
1115
1116 /* Determine if it is a Rigol or not */
1117 data->rigol_quirk = 0;
1118 dev_dbg(&intf->dev, "Trying to find if device Vendor 0x%04X Product 0x%04X has the RIGOL quirk\n",
1119 le16_to_cpu(data->usb_dev->descriptor.idVendor),
1120 le16_to_cpu(data->usb_dev->descriptor.idProduct));
1121 for(n = 0; usbtmc_id_quirk[n].idVendor > 0; n++) {
1122 if ((usbtmc_id_quirk[n].idVendor == le16_to_cpu(data->usb_dev->descriptor.idVendor)) &&
1123 (usbtmc_id_quirk[n].idProduct == le16_to_cpu(data->usb_dev->descriptor.idProduct))) {
1124 dev_dbg(&intf->dev, "Setting this device as having the RIGOL quirk\n");
1125 data->rigol_quirk = 1;
1126 break;
1127 }
1128 }
1129
1130 /* Initialize USBTMC bTag and other fields */
1131 data->bTag = 1;
1132 data->TermCharEnabled = 0;
1133 data->TermChar = '\n';
1134
1135 /* USBTMC devices have only one setting, so use that */
1136 iface_desc = data->intf->cur_altsetting;
1137
1138 /* Find bulk in endpoint */
1139 for (n = 0; n < iface_desc->desc.bNumEndpoints; n++) {
1140 endpoint = &iface_desc->endpoint[n].desc;
1141
1142 if (usb_endpoint_is_bulk_in(endpoint)) {
1143 data->bulk_in = endpoint->bEndpointAddress;
1144 dev_dbg(&intf->dev, "Found bulk in endpoint at %u\n",
1145 data->bulk_in);
1146 break;
1147 }
1148 }
1149
1150 /* Find bulk out endpoint */
1151 for (n = 0; n < iface_desc->desc.bNumEndpoints; n++) {
1152 endpoint = &iface_desc->endpoint[n].desc;
1153
1154 if (usb_endpoint_is_bulk_out(endpoint)) {
1155 data->bulk_out = endpoint->bEndpointAddress;
1156 dev_dbg(&intf->dev, "Found Bulk out endpoint at %u\n",
1157 data->bulk_out);
1158 break;
1159 }
1160 }
1161
1162 retcode = get_capabilities(data);
1163 if (retcode)
1164 dev_err(&intf->dev, "can't read capabilities\n");
1165 else
1166 retcode = sysfs_create_group(&intf->dev.kobj,
1167 &capability_attr_grp);
1168
1169 retcode = sysfs_create_group(&intf->dev.kobj, &data_attr_grp);
1170
1171 retcode = usb_register_dev(intf, &usbtmc_class);
1172 if (retcode) {
1173 dev_err(&intf->dev, "Not able to get a minor"
1174 " (base %u, slice default): %d\n", USBTMC_MINOR_BASE,
1175 retcode);
1176 goto error_register;
1177 }
1178 dev_dbg(&intf->dev, "Using minor number %d\n", intf->minor);
1179
1180 return 0;
1181
1182error_register:
1183 sysfs_remove_group(&intf->dev.kobj, &capability_attr_grp);
1184 sysfs_remove_group(&intf->dev.kobj, &data_attr_grp);
1185 kref_put(&data->kref, usbtmc_delete);
1186 return retcode;
1187}
1188
1189static void usbtmc_disconnect(struct usb_interface *intf)
1190{
1191 struct usbtmc_device_data *data;
1192
1193 dev_dbg(&intf->dev, "usbtmc_disconnect called\n");
1194
1195 data = usb_get_intfdata(intf);
1196 usb_deregister_dev(intf, &usbtmc_class);
1197 sysfs_remove_group(&intf->dev.kobj, &capability_attr_grp);
1198 sysfs_remove_group(&intf->dev.kobj, &data_attr_grp);
1199 mutex_lock(&data->io_mutex);
1200 data->zombie = 1;
1201 mutex_unlock(&data->io_mutex);
1202 kref_put(&data->kref, usbtmc_delete);
1203}
1204
1205static int usbtmc_suspend(struct usb_interface *intf, pm_message_t message)
1206{
1207 /* this driver does not have pending URBs */
1208 return 0;
1209}
1210
1211static int usbtmc_resume(struct usb_interface *intf)
1212{
1213 return 0;
1214}
1215
1216static struct usb_driver usbtmc_driver = {
1217 .name = "usbtmc",
1218 .id_table = usbtmc_devices,
1219 .probe = usbtmc_probe,
1220 .disconnect = usbtmc_disconnect,
1221 .suspend = usbtmc_suspend,
1222 .resume = usbtmc_resume,
1223};
1224
1225module_usb_driver(usbtmc_driver);
1226
1227MODULE_LICENSE("GPL");
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#include <linux/init.h>
23#include <linux/module.h>
24#include <linux/kernel.h>
25#include <linux/fs.h>
26#include <linux/uaccess.h>
27#include <linux/kref.h>
28#include <linux/slab.h>
29#include <linux/mutex.h>
30#include <linux/usb.h>
31#include <linux/usb/tmc.h>
32
33
34#define USBTMC_MINOR_BASE 176
35
36/*
37 * Size of driver internal IO buffer. Must be multiple of 4 and at least as
38 * large as wMaxPacketSize (which is usually 512 bytes).
39 */
40#define USBTMC_SIZE_IOBUFFER 2048
41
42/* Default USB timeout (in milliseconds) */
43#define USBTMC_TIMEOUT 5000
44
45/*
46 * Maximum number of read cycles to empty bulk in endpoint during CLEAR and
47 * ABORT_BULK_IN requests. Ends the loop if (for whatever reason) a short
48 * packet is never read.
49 */
50#define USBTMC_MAX_READS_TO_CLEAR_BULK_IN 100
51
52static const struct usb_device_id usbtmc_devices[] = {
53 { USB_INTERFACE_INFO(USB_CLASS_APP_SPEC, 3, 0), },
54 { USB_INTERFACE_INFO(USB_CLASS_APP_SPEC, 3, 1), },
55 { 0, } /* terminating entry */
56};
57MODULE_DEVICE_TABLE(usb, usbtmc_devices);
58
59/*
60 * This structure is the capabilities for the device
61 * See section 4.2.1.8 of the USBTMC specification,
62 * and section 4.2.2 of the USBTMC usb488 subclass
63 * specification for details.
64 */
65struct usbtmc_dev_capabilities {
66 __u8 interface_capabilities;
67 __u8 device_capabilities;
68 __u8 usb488_interface_capabilities;
69 __u8 usb488_device_capabilities;
70};
71
72/* This structure holds private data for each USBTMC device. One copy is
73 * allocated for each USBTMC device in the driver's probe function.
74 */
75struct usbtmc_device_data {
76 const struct usb_device_id *id;
77 struct usb_device *usb_dev;
78 struct usb_interface *intf;
79
80 unsigned int bulk_in;
81 unsigned int bulk_out;
82
83 u8 bTag;
84 u8 bTag_last_write; /* needed for abort */
85 u8 bTag_last_read; /* needed for abort */
86
87 /* attributes from the USB TMC spec for this device */
88 u8 TermChar;
89 bool TermCharEnabled;
90 bool auto_abort;
91
92 bool zombie; /* fd of disconnected device */
93
94 struct usbtmc_dev_capabilities capabilities;
95 struct kref kref;
96 struct mutex io_mutex; /* only one i/o function running at a time */
97};
98#define to_usbtmc_data(d) container_of(d, struct usbtmc_device_data, kref)
99
100/* Forward declarations */
101static struct usb_driver usbtmc_driver;
102
103static void usbtmc_delete(struct kref *kref)
104{
105 struct usbtmc_device_data *data = to_usbtmc_data(kref);
106
107 usb_put_dev(data->usb_dev);
108 kfree(data);
109}
110
111static int usbtmc_open(struct inode *inode, struct file *filp)
112{
113 struct usb_interface *intf;
114 struct usbtmc_device_data *data;
115 int retval = 0;
116
117 intf = usb_find_interface(&usbtmc_driver, iminor(inode));
118 if (!intf) {
119 printk(KERN_ERR KBUILD_MODNAME
120 ": can not find device for minor %d", iminor(inode));
121 retval = -ENODEV;
122 goto exit;
123 }
124
125 data = usb_get_intfdata(intf);
126 kref_get(&data->kref);
127
128 /* Store pointer in file structure's private data field */
129 filp->private_data = data;
130
131exit:
132 return retval;
133}
134
135static int usbtmc_release(struct inode *inode, struct file *file)
136{
137 struct usbtmc_device_data *data = file->private_data;
138
139 kref_put(&data->kref, usbtmc_delete);
140 return 0;
141}
142
143static int usbtmc_ioctl_abort_bulk_in(struct usbtmc_device_data *data)
144{
145 u8 *buffer;
146 struct device *dev;
147 int rv;
148 int n;
149 int actual;
150 struct usb_host_interface *current_setting;
151 int max_size;
152
153 dev = &data->intf->dev;
154 buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL);
155 if (!buffer)
156 return -ENOMEM;
157
158 rv = usb_control_msg(data->usb_dev,
159 usb_rcvctrlpipe(data->usb_dev, 0),
160 USBTMC_REQUEST_INITIATE_ABORT_BULK_IN,
161 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT,
162 data->bTag_last_read, data->bulk_in,
163 buffer, 2, USBTMC_TIMEOUT);
164
165 if (rv < 0) {
166 dev_err(dev, "usb_control_msg returned %d\n", rv);
167 goto exit;
168 }
169
170 dev_dbg(dev, "INITIATE_ABORT_BULK_IN returned %x\n", buffer[0]);
171
172 if (buffer[0] == USBTMC_STATUS_FAILED) {
173 rv = 0;
174 goto exit;
175 }
176
177 if (buffer[0] != USBTMC_STATUS_SUCCESS) {
178 dev_err(dev, "INITIATE_ABORT_BULK_IN returned %x\n",
179 buffer[0]);
180 rv = -EPERM;
181 goto exit;
182 }
183
184 max_size = 0;
185 current_setting = data->intf->cur_altsetting;
186 for (n = 0; n < current_setting->desc.bNumEndpoints; n++)
187 if (current_setting->endpoint[n].desc.bEndpointAddress ==
188 data->bulk_in)
189 max_size = usb_endpoint_maxp(¤t_setting->endpoint[n].desc);
190
191 if (max_size == 0) {
192 dev_err(dev, "Couldn't get wMaxPacketSize\n");
193 rv = -EPERM;
194 goto exit;
195 }
196
197 dev_dbg(&data->intf->dev, "wMaxPacketSize is %d\n", max_size);
198
199 n = 0;
200
201 do {
202 dev_dbg(dev, "Reading from bulk in EP\n");
203
204 rv = usb_bulk_msg(data->usb_dev,
205 usb_rcvbulkpipe(data->usb_dev,
206 data->bulk_in),
207 buffer, USBTMC_SIZE_IOBUFFER,
208 &actual, USBTMC_TIMEOUT);
209
210 n++;
211
212 if (rv < 0) {
213 dev_err(dev, "usb_bulk_msg returned %d\n", rv);
214 goto exit;
215 }
216 } while ((actual == max_size) &&
217 (n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN));
218
219 if (actual == max_size) {
220 dev_err(dev, "Couldn't clear device buffer within %d cycles\n",
221 USBTMC_MAX_READS_TO_CLEAR_BULK_IN);
222 rv = -EPERM;
223 goto exit;
224 }
225
226 n = 0;
227
228usbtmc_abort_bulk_in_status:
229 rv = usb_control_msg(data->usb_dev,
230 usb_rcvctrlpipe(data->usb_dev, 0),
231 USBTMC_REQUEST_CHECK_ABORT_BULK_IN_STATUS,
232 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT,
233 0, data->bulk_in, buffer, 0x08,
234 USBTMC_TIMEOUT);
235
236 if (rv < 0) {
237 dev_err(dev, "usb_control_msg returned %d\n", rv);
238 goto exit;
239 }
240
241 dev_dbg(dev, "INITIATE_ABORT_BULK_IN returned %x\n", buffer[0]);
242
243 if (buffer[0] == USBTMC_STATUS_SUCCESS) {
244 rv = 0;
245 goto exit;
246 }
247
248 if (buffer[0] != USBTMC_STATUS_PENDING) {
249 dev_err(dev, "INITIATE_ABORT_BULK_IN returned %x\n", buffer[0]);
250 rv = -EPERM;
251 goto exit;
252 }
253
254 if (buffer[1] == 1)
255 do {
256 dev_dbg(dev, "Reading from bulk in EP\n");
257
258 rv = usb_bulk_msg(data->usb_dev,
259 usb_rcvbulkpipe(data->usb_dev,
260 data->bulk_in),
261 buffer, USBTMC_SIZE_IOBUFFER,
262 &actual, USBTMC_TIMEOUT);
263
264 n++;
265
266 if (rv < 0) {
267 dev_err(dev, "usb_bulk_msg returned %d\n", rv);
268 goto exit;
269 }
270 } while ((actual == max_size) &&
271 (n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN));
272
273 if (actual == max_size) {
274 dev_err(dev, "Couldn't clear device buffer within %d cycles\n",
275 USBTMC_MAX_READS_TO_CLEAR_BULK_IN);
276 rv = -EPERM;
277 goto exit;
278 }
279
280 goto usbtmc_abort_bulk_in_status;
281
282exit:
283 kfree(buffer);
284 return rv;
285
286}
287
288static int usbtmc_ioctl_abort_bulk_out(struct usbtmc_device_data *data)
289{
290 struct device *dev;
291 u8 *buffer;
292 int rv;
293 int n;
294
295 dev = &data->intf->dev;
296
297 buffer = kmalloc(8, GFP_KERNEL);
298 if (!buffer)
299 return -ENOMEM;
300
301 rv = usb_control_msg(data->usb_dev,
302 usb_rcvctrlpipe(data->usb_dev, 0),
303 USBTMC_REQUEST_INITIATE_ABORT_BULK_OUT,
304 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT,
305 data->bTag_last_write, data->bulk_out,
306 buffer, 2, USBTMC_TIMEOUT);
307
308 if (rv < 0) {
309 dev_err(dev, "usb_control_msg returned %d\n", rv);
310 goto exit;
311 }
312
313 dev_dbg(dev, "INITIATE_ABORT_BULK_OUT returned %x\n", buffer[0]);
314
315 if (buffer[0] != USBTMC_STATUS_SUCCESS) {
316 dev_err(dev, "INITIATE_ABORT_BULK_OUT returned %x\n",
317 buffer[0]);
318 rv = -EPERM;
319 goto exit;
320 }
321
322 n = 0;
323
324usbtmc_abort_bulk_out_check_status:
325 rv = usb_control_msg(data->usb_dev,
326 usb_rcvctrlpipe(data->usb_dev, 0),
327 USBTMC_REQUEST_CHECK_ABORT_BULK_OUT_STATUS,
328 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT,
329 0, data->bulk_out, buffer, 0x08,
330 USBTMC_TIMEOUT);
331 n++;
332 if (rv < 0) {
333 dev_err(dev, "usb_control_msg returned %d\n", rv);
334 goto exit;
335 }
336
337 dev_dbg(dev, "CHECK_ABORT_BULK_OUT returned %x\n", buffer[0]);
338
339 if (buffer[0] == USBTMC_STATUS_SUCCESS)
340 goto usbtmc_abort_bulk_out_clear_halt;
341
342 if ((buffer[0] == USBTMC_STATUS_PENDING) &&
343 (n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN))
344 goto usbtmc_abort_bulk_out_check_status;
345
346 rv = -EPERM;
347 goto exit;
348
349usbtmc_abort_bulk_out_clear_halt:
350 rv = usb_clear_halt(data->usb_dev,
351 usb_sndbulkpipe(data->usb_dev, data->bulk_out));
352
353 if (rv < 0) {
354 dev_err(dev, "usb_control_msg returned %d\n", rv);
355 goto exit;
356 }
357 rv = 0;
358
359exit:
360 kfree(buffer);
361 return rv;
362}
363
364static ssize_t usbtmc_read(struct file *filp, char __user *buf,
365 size_t count, loff_t *f_pos)
366{
367 struct usbtmc_device_data *data;
368 struct device *dev;
369 u32 n_characters;
370 u8 *buffer;
371 int actual;
372 size_t done;
373 size_t remaining;
374 int retval;
375 size_t this_part;
376
377 /* Get pointer to private data structure */
378 data = filp->private_data;
379 dev = &data->intf->dev;
380
381 buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL);
382 if (!buffer)
383 return -ENOMEM;
384
385 mutex_lock(&data->io_mutex);
386 if (data->zombie) {
387 retval = -ENODEV;
388 goto exit;
389 }
390
391 remaining = count;
392 done = 0;
393
394 while (remaining > 0) {
395 if (remaining > USBTMC_SIZE_IOBUFFER - 12 - 3)
396 this_part = USBTMC_SIZE_IOBUFFER - 12 - 3;
397 else
398 this_part = remaining;
399
400 /* Setup IO buffer for DEV_DEP_MSG_IN message
401 * Refer to class specs for details
402 */
403 buffer[0] = 2;
404 buffer[1] = data->bTag;
405 buffer[2] = ~(data->bTag);
406 buffer[3] = 0; /* Reserved */
407 buffer[4] = (this_part) & 255;
408 buffer[5] = ((this_part) >> 8) & 255;
409 buffer[6] = ((this_part) >> 16) & 255;
410 buffer[7] = ((this_part) >> 24) & 255;
411 buffer[8] = data->TermCharEnabled * 2;
412 /* Use term character? */
413 buffer[9] = data->TermChar;
414 buffer[10] = 0; /* Reserved */
415 buffer[11] = 0; /* Reserved */
416
417 /* Send bulk URB */
418 retval = usb_bulk_msg(data->usb_dev,
419 usb_sndbulkpipe(data->usb_dev,
420 data->bulk_out),
421 buffer, 12, &actual, USBTMC_TIMEOUT);
422
423 /* Store bTag (in case we need to abort) */
424 data->bTag_last_write = data->bTag;
425
426 /* Increment bTag -- and increment again if zero */
427 data->bTag++;
428 if (!data->bTag)
429 (data->bTag)++;
430
431 if (retval < 0) {
432 dev_err(dev, "usb_bulk_msg returned %d\n", retval);
433 if (data->auto_abort)
434 usbtmc_ioctl_abort_bulk_out(data);
435 goto exit;
436 }
437
438 /* Send bulk URB */
439 retval = usb_bulk_msg(data->usb_dev,
440 usb_rcvbulkpipe(data->usb_dev,
441 data->bulk_in),
442 buffer, USBTMC_SIZE_IOBUFFER, &actual,
443 USBTMC_TIMEOUT);
444
445 /* Store bTag (in case we need to abort) */
446 data->bTag_last_read = data->bTag;
447
448 if (retval < 0) {
449 dev_err(dev, "Unable to read data, error %d\n", retval);
450 if (data->auto_abort)
451 usbtmc_ioctl_abort_bulk_in(data);
452 goto exit;
453 }
454
455 /* How many characters did the instrument send? */
456 n_characters = buffer[4] +
457 (buffer[5] << 8) +
458 (buffer[6] << 16) +
459 (buffer[7] << 24);
460
461 /* Ensure the instrument doesn't lie about it */
462 if(n_characters > actual - 12) {
463 dev_err(dev, "Device lies about message size: %u > %d\n", n_characters, actual - 12);
464 n_characters = actual - 12;
465 }
466
467 /* Ensure the instrument doesn't send more back than requested */
468 if(n_characters > this_part) {
469 dev_err(dev, "Device returns more than requested: %zu > %zu\n", done + n_characters, done + this_part);
470 n_characters = this_part;
471 }
472
473 /* Bound amount of data received by amount of data requested */
474 if (n_characters > this_part)
475 n_characters = this_part;
476
477 /* Copy buffer to user space */
478 if (copy_to_user(buf + done, &buffer[12], n_characters)) {
479 /* There must have been an addressing problem */
480 retval = -EFAULT;
481 goto exit;
482 }
483
484 done += n_characters;
485 /* Terminate if end-of-message bit received from device */
486 if ((buffer[8] & 0x01) && (actual >= n_characters + 12))
487 remaining = 0;
488 else
489 remaining -= n_characters;
490 }
491
492 /* Update file position value */
493 *f_pos = *f_pos + done;
494 retval = done;
495
496exit:
497 mutex_unlock(&data->io_mutex);
498 kfree(buffer);
499 return retval;
500}
501
502static ssize_t usbtmc_write(struct file *filp, const char __user *buf,
503 size_t count, loff_t *f_pos)
504{
505 struct usbtmc_device_data *data;
506 u8 *buffer;
507 int retval;
508 int actual;
509 unsigned long int n_bytes;
510 int remaining;
511 int done;
512 int this_part;
513
514 data = filp->private_data;
515
516 buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL);
517 if (!buffer)
518 return -ENOMEM;
519
520 mutex_lock(&data->io_mutex);
521 if (data->zombie) {
522 retval = -ENODEV;
523 goto exit;
524 }
525
526 remaining = count;
527 done = 0;
528
529 while (remaining > 0) {
530 if (remaining > USBTMC_SIZE_IOBUFFER - 12) {
531 this_part = USBTMC_SIZE_IOBUFFER - 12;
532 buffer[8] = 0;
533 } else {
534 this_part = remaining;
535 buffer[8] = 1;
536 }
537
538 /* Setup IO buffer for DEV_DEP_MSG_OUT message */
539 buffer[0] = 1;
540 buffer[1] = data->bTag;
541 buffer[2] = ~(data->bTag);
542 buffer[3] = 0; /* Reserved */
543 buffer[4] = this_part & 255;
544 buffer[5] = (this_part >> 8) & 255;
545 buffer[6] = (this_part >> 16) & 255;
546 buffer[7] = (this_part >> 24) & 255;
547 /* buffer[8] is set above... */
548 buffer[9] = 0; /* Reserved */
549 buffer[10] = 0; /* Reserved */
550 buffer[11] = 0; /* Reserved */
551
552 if (copy_from_user(&buffer[12], buf + done, this_part)) {
553 retval = -EFAULT;
554 goto exit;
555 }
556
557 n_bytes = roundup(12 + this_part, 4);
558 memset(buffer + 12 + this_part, 0, n_bytes - (12 + this_part));
559
560 do {
561 retval = usb_bulk_msg(data->usb_dev,
562 usb_sndbulkpipe(data->usb_dev,
563 data->bulk_out),
564 buffer, n_bytes,
565 &actual, USBTMC_TIMEOUT);
566 if (retval != 0)
567 break;
568 n_bytes -= actual;
569 } while (n_bytes);
570
571 data->bTag_last_write = data->bTag;
572 data->bTag++;
573
574 if (!data->bTag)
575 data->bTag++;
576
577 if (retval < 0) {
578 dev_err(&data->intf->dev,
579 "Unable to send data, error %d\n", retval);
580 if (data->auto_abort)
581 usbtmc_ioctl_abort_bulk_out(data);
582 goto exit;
583 }
584
585 remaining -= this_part;
586 done += this_part;
587 }
588
589 retval = count;
590exit:
591 mutex_unlock(&data->io_mutex);
592 kfree(buffer);
593 return retval;
594}
595
596static int usbtmc_ioctl_clear(struct usbtmc_device_data *data)
597{
598 struct usb_host_interface *current_setting;
599 struct usb_endpoint_descriptor *desc;
600 struct device *dev;
601 u8 *buffer;
602 int rv;
603 int n;
604 int actual;
605 int max_size;
606
607 dev = &data->intf->dev;
608
609 dev_dbg(dev, "Sending INITIATE_CLEAR request\n");
610
611 buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL);
612 if (!buffer)
613 return -ENOMEM;
614
615 rv = usb_control_msg(data->usb_dev,
616 usb_rcvctrlpipe(data->usb_dev, 0),
617 USBTMC_REQUEST_INITIATE_CLEAR,
618 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
619 0, 0, buffer, 1, USBTMC_TIMEOUT);
620 if (rv < 0) {
621 dev_err(dev, "usb_control_msg returned %d\n", rv);
622 goto exit;
623 }
624
625 dev_dbg(dev, "INITIATE_CLEAR returned %x\n", buffer[0]);
626
627 if (buffer[0] != USBTMC_STATUS_SUCCESS) {
628 dev_err(dev, "INITIATE_CLEAR returned %x\n", buffer[0]);
629 rv = -EPERM;
630 goto exit;
631 }
632
633 max_size = 0;
634 current_setting = data->intf->cur_altsetting;
635 for (n = 0; n < current_setting->desc.bNumEndpoints; n++) {
636 desc = ¤t_setting->endpoint[n].desc;
637 if (desc->bEndpointAddress == data->bulk_in)
638 max_size = usb_endpoint_maxp(desc);
639 }
640
641 if (max_size == 0) {
642 dev_err(dev, "Couldn't get wMaxPacketSize\n");
643 rv = -EPERM;
644 goto exit;
645 }
646
647 dev_dbg(dev, "wMaxPacketSize is %d\n", max_size);
648
649 n = 0;
650
651usbtmc_clear_check_status:
652
653 dev_dbg(dev, "Sending CHECK_CLEAR_STATUS request\n");
654
655 rv = usb_control_msg(data->usb_dev,
656 usb_rcvctrlpipe(data->usb_dev, 0),
657 USBTMC_REQUEST_CHECK_CLEAR_STATUS,
658 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
659 0, 0, buffer, 2, USBTMC_TIMEOUT);
660 if (rv < 0) {
661 dev_err(dev, "usb_control_msg returned %d\n", rv);
662 goto exit;
663 }
664
665 dev_dbg(dev, "CHECK_CLEAR_STATUS returned %x\n", buffer[0]);
666
667 if (buffer[0] == USBTMC_STATUS_SUCCESS)
668 goto usbtmc_clear_bulk_out_halt;
669
670 if (buffer[0] != USBTMC_STATUS_PENDING) {
671 dev_err(dev, "CHECK_CLEAR_STATUS returned %x\n", buffer[0]);
672 rv = -EPERM;
673 goto exit;
674 }
675
676 if (buffer[1] == 1)
677 do {
678 dev_dbg(dev, "Reading from bulk in EP\n");
679
680 rv = usb_bulk_msg(data->usb_dev,
681 usb_rcvbulkpipe(data->usb_dev,
682 data->bulk_in),
683 buffer, USBTMC_SIZE_IOBUFFER,
684 &actual, USBTMC_TIMEOUT);
685 n++;
686
687 if (rv < 0) {
688 dev_err(dev, "usb_control_msg returned %d\n",
689 rv);
690 goto exit;
691 }
692 } while ((actual == max_size) &&
693 (n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN));
694
695 if (actual == max_size) {
696 dev_err(dev, "Couldn't clear device buffer within %d cycles\n",
697 USBTMC_MAX_READS_TO_CLEAR_BULK_IN);
698 rv = -EPERM;
699 goto exit;
700 }
701
702 goto usbtmc_clear_check_status;
703
704usbtmc_clear_bulk_out_halt:
705
706 rv = usb_clear_halt(data->usb_dev,
707 usb_sndbulkpipe(data->usb_dev, data->bulk_out));
708 if (rv < 0) {
709 dev_err(dev, "usb_control_msg returned %d\n", rv);
710 goto exit;
711 }
712 rv = 0;
713
714exit:
715 kfree(buffer);
716 return rv;
717}
718
719static int usbtmc_ioctl_clear_out_halt(struct usbtmc_device_data *data)
720{
721 u8 *buffer;
722 int rv;
723
724 buffer = kmalloc(2, GFP_KERNEL);
725 if (!buffer)
726 return -ENOMEM;
727
728 rv = usb_clear_halt(data->usb_dev,
729 usb_sndbulkpipe(data->usb_dev, data->bulk_out));
730
731 if (rv < 0) {
732 dev_err(&data->usb_dev->dev, "usb_control_msg returned %d\n",
733 rv);
734 goto exit;
735 }
736 rv = 0;
737
738exit:
739 kfree(buffer);
740 return rv;
741}
742
743static int usbtmc_ioctl_clear_in_halt(struct usbtmc_device_data *data)
744{
745 u8 *buffer;
746 int rv;
747
748 buffer = kmalloc(2, GFP_KERNEL);
749 if (!buffer)
750 return -ENOMEM;
751
752 rv = usb_clear_halt(data->usb_dev,
753 usb_rcvbulkpipe(data->usb_dev, data->bulk_in));
754
755 if (rv < 0) {
756 dev_err(&data->usb_dev->dev, "usb_control_msg returned %d\n",
757 rv);
758 goto exit;
759 }
760 rv = 0;
761
762exit:
763 kfree(buffer);
764 return rv;
765}
766
767static int get_capabilities(struct usbtmc_device_data *data)
768{
769 struct device *dev = &data->usb_dev->dev;
770 char *buffer;
771 int rv = 0;
772
773 buffer = kmalloc(0x18, GFP_KERNEL);
774 if (!buffer)
775 return -ENOMEM;
776
777 rv = usb_control_msg(data->usb_dev, usb_rcvctrlpipe(data->usb_dev, 0),
778 USBTMC_REQUEST_GET_CAPABILITIES,
779 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
780 0, 0, buffer, 0x18, USBTMC_TIMEOUT);
781 if (rv < 0) {
782 dev_err(dev, "usb_control_msg returned %d\n", rv);
783 goto err_out;
784 }
785
786 dev_dbg(dev, "GET_CAPABILITIES returned %x\n", buffer[0]);
787 if (buffer[0] != USBTMC_STATUS_SUCCESS) {
788 dev_err(dev, "GET_CAPABILITIES returned %x\n", buffer[0]);
789 rv = -EPERM;
790 goto err_out;
791 }
792 dev_dbg(dev, "Interface capabilities are %x\n", buffer[4]);
793 dev_dbg(dev, "Device capabilities are %x\n", buffer[5]);
794 dev_dbg(dev, "USB488 interface capabilities are %x\n", buffer[14]);
795 dev_dbg(dev, "USB488 device capabilities are %x\n", buffer[15]);
796
797 data->capabilities.interface_capabilities = buffer[4];
798 data->capabilities.device_capabilities = buffer[5];
799 data->capabilities.usb488_interface_capabilities = buffer[14];
800 data->capabilities.usb488_device_capabilities = buffer[15];
801 rv = 0;
802
803err_out:
804 kfree(buffer);
805 return rv;
806}
807
808#define capability_attribute(name) \
809static ssize_t show_##name(struct device *dev, \
810 struct device_attribute *attr, char *buf) \
811{ \
812 struct usb_interface *intf = to_usb_interface(dev); \
813 struct usbtmc_device_data *data = usb_get_intfdata(intf); \
814 \
815 return sprintf(buf, "%d\n", data->capabilities.name); \
816} \
817static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)
818
819capability_attribute(interface_capabilities);
820capability_attribute(device_capabilities);
821capability_attribute(usb488_interface_capabilities);
822capability_attribute(usb488_device_capabilities);
823
824static struct attribute *capability_attrs[] = {
825 &dev_attr_interface_capabilities.attr,
826 &dev_attr_device_capabilities.attr,
827 &dev_attr_usb488_interface_capabilities.attr,
828 &dev_attr_usb488_device_capabilities.attr,
829 NULL,
830};
831
832static struct attribute_group capability_attr_grp = {
833 .attrs = capability_attrs,
834};
835
836static ssize_t show_TermChar(struct device *dev,
837 struct device_attribute *attr, char *buf)
838{
839 struct usb_interface *intf = to_usb_interface(dev);
840 struct usbtmc_device_data *data = usb_get_intfdata(intf);
841
842 return sprintf(buf, "%c\n", data->TermChar);
843}
844
845static ssize_t store_TermChar(struct device *dev,
846 struct device_attribute *attr,
847 const char *buf, size_t count)
848{
849 struct usb_interface *intf = to_usb_interface(dev);
850 struct usbtmc_device_data *data = usb_get_intfdata(intf);
851
852 if (count < 1)
853 return -EINVAL;
854 data->TermChar = buf[0];
855 return count;
856}
857static DEVICE_ATTR(TermChar, S_IRUGO, show_TermChar, store_TermChar);
858
859#define data_attribute(name) \
860static ssize_t show_##name(struct device *dev, \
861 struct device_attribute *attr, char *buf) \
862{ \
863 struct usb_interface *intf = to_usb_interface(dev); \
864 struct usbtmc_device_data *data = usb_get_intfdata(intf); \
865 \
866 return sprintf(buf, "%d\n", data->name); \
867} \
868static ssize_t store_##name(struct device *dev, \
869 struct device_attribute *attr, \
870 const char *buf, size_t count) \
871{ \
872 struct usb_interface *intf = to_usb_interface(dev); \
873 struct usbtmc_device_data *data = usb_get_intfdata(intf); \
874 ssize_t result; \
875 unsigned val; \
876 \
877 result = sscanf(buf, "%u\n", &val); \
878 if (result != 1) \
879 result = -EINVAL; \
880 data->name = val; \
881 if (result < 0) \
882 return result; \
883 else \
884 return count; \
885} \
886static DEVICE_ATTR(name, S_IRUGO, show_##name, store_##name)
887
888data_attribute(TermCharEnabled);
889data_attribute(auto_abort);
890
891static struct attribute *data_attrs[] = {
892 &dev_attr_TermChar.attr,
893 &dev_attr_TermCharEnabled.attr,
894 &dev_attr_auto_abort.attr,
895 NULL,
896};
897
898static struct attribute_group data_attr_grp = {
899 .attrs = data_attrs,
900};
901
902static int usbtmc_ioctl_indicator_pulse(struct usbtmc_device_data *data)
903{
904 struct device *dev;
905 u8 *buffer;
906 int rv;
907
908 dev = &data->intf->dev;
909
910 buffer = kmalloc(2, GFP_KERNEL);
911 if (!buffer)
912 return -ENOMEM;
913
914 rv = usb_control_msg(data->usb_dev,
915 usb_rcvctrlpipe(data->usb_dev, 0),
916 USBTMC_REQUEST_INDICATOR_PULSE,
917 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
918 0, 0, buffer, 0x01, USBTMC_TIMEOUT);
919
920 if (rv < 0) {
921 dev_err(dev, "usb_control_msg returned %d\n", rv);
922 goto exit;
923 }
924
925 dev_dbg(dev, "INDICATOR_PULSE returned %x\n", buffer[0]);
926
927 if (buffer[0] != USBTMC_STATUS_SUCCESS) {
928 dev_err(dev, "INDICATOR_PULSE returned %x\n", buffer[0]);
929 rv = -EPERM;
930 goto exit;
931 }
932 rv = 0;
933
934exit:
935 kfree(buffer);
936 return rv;
937}
938
939static long usbtmc_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
940{
941 struct usbtmc_device_data *data;
942 int retval = -EBADRQC;
943
944 data = file->private_data;
945 mutex_lock(&data->io_mutex);
946 if (data->zombie) {
947 retval = -ENODEV;
948 goto skip_io_on_zombie;
949 }
950
951 switch (cmd) {
952 case USBTMC_IOCTL_CLEAR_OUT_HALT:
953 retval = usbtmc_ioctl_clear_out_halt(data);
954 break;
955
956 case USBTMC_IOCTL_CLEAR_IN_HALT:
957 retval = usbtmc_ioctl_clear_in_halt(data);
958 break;
959
960 case USBTMC_IOCTL_INDICATOR_PULSE:
961 retval = usbtmc_ioctl_indicator_pulse(data);
962 break;
963
964 case USBTMC_IOCTL_CLEAR:
965 retval = usbtmc_ioctl_clear(data);
966 break;
967
968 case USBTMC_IOCTL_ABORT_BULK_OUT:
969 retval = usbtmc_ioctl_abort_bulk_out(data);
970 break;
971
972 case USBTMC_IOCTL_ABORT_BULK_IN:
973 retval = usbtmc_ioctl_abort_bulk_in(data);
974 break;
975 }
976
977skip_io_on_zombie:
978 mutex_unlock(&data->io_mutex);
979 return retval;
980}
981
982static const struct file_operations fops = {
983 .owner = THIS_MODULE,
984 .read = usbtmc_read,
985 .write = usbtmc_write,
986 .open = usbtmc_open,
987 .release = usbtmc_release,
988 .unlocked_ioctl = usbtmc_ioctl,
989 .llseek = default_llseek,
990};
991
992static struct usb_class_driver usbtmc_class = {
993 .name = "usbtmc%d",
994 .fops = &fops,
995 .minor_base = USBTMC_MINOR_BASE,
996};
997
998
999static int usbtmc_probe(struct usb_interface *intf,
1000 const struct usb_device_id *id)
1001{
1002 struct usbtmc_device_data *data;
1003 struct usb_host_interface *iface_desc;
1004 struct usb_endpoint_descriptor *endpoint;
1005 int n;
1006 int retcode;
1007
1008 dev_dbg(&intf->dev, "%s called\n", __func__);
1009
1010 data = kmalloc(sizeof(struct usbtmc_device_data), GFP_KERNEL);
1011 if (!data) {
1012 dev_err(&intf->dev, "Unable to allocate kernel memory\n");
1013 return -ENOMEM;
1014 }
1015
1016 data->intf = intf;
1017 data->id = id;
1018 data->usb_dev = usb_get_dev(interface_to_usbdev(intf));
1019 usb_set_intfdata(intf, data);
1020 kref_init(&data->kref);
1021 mutex_init(&data->io_mutex);
1022 data->zombie = 0;
1023
1024 /* Initialize USBTMC bTag and other fields */
1025 data->bTag = 1;
1026 data->TermCharEnabled = 0;
1027 data->TermChar = '\n';
1028
1029 /* USBTMC devices have only one setting, so use that */
1030 iface_desc = data->intf->cur_altsetting;
1031
1032 /* Find bulk in endpoint */
1033 for (n = 0; n < iface_desc->desc.bNumEndpoints; n++) {
1034 endpoint = &iface_desc->endpoint[n].desc;
1035
1036 if (usb_endpoint_is_bulk_in(endpoint)) {
1037 data->bulk_in = endpoint->bEndpointAddress;
1038 dev_dbg(&intf->dev, "Found bulk in endpoint at %u\n",
1039 data->bulk_in);
1040 break;
1041 }
1042 }
1043
1044 /* Find bulk out endpoint */
1045 for (n = 0; n < iface_desc->desc.bNumEndpoints; n++) {
1046 endpoint = &iface_desc->endpoint[n].desc;
1047
1048 if (usb_endpoint_is_bulk_out(endpoint)) {
1049 data->bulk_out = endpoint->bEndpointAddress;
1050 dev_dbg(&intf->dev, "Found Bulk out endpoint at %u\n",
1051 data->bulk_out);
1052 break;
1053 }
1054 }
1055
1056 retcode = get_capabilities(data);
1057 if (retcode)
1058 dev_err(&intf->dev, "can't read capabilities\n");
1059 else
1060 retcode = sysfs_create_group(&intf->dev.kobj,
1061 &capability_attr_grp);
1062
1063 retcode = sysfs_create_group(&intf->dev.kobj, &data_attr_grp);
1064
1065 retcode = usb_register_dev(intf, &usbtmc_class);
1066 if (retcode) {
1067 dev_err(&intf->dev, "Not able to get a minor"
1068 " (base %u, slice default): %d\n", USBTMC_MINOR_BASE,
1069 retcode);
1070 goto error_register;
1071 }
1072 dev_dbg(&intf->dev, "Using minor number %d\n", intf->minor);
1073
1074 return 0;
1075
1076error_register:
1077 sysfs_remove_group(&intf->dev.kobj, &capability_attr_grp);
1078 sysfs_remove_group(&intf->dev.kobj, &data_attr_grp);
1079 kref_put(&data->kref, usbtmc_delete);
1080 return retcode;
1081}
1082
1083static void usbtmc_disconnect(struct usb_interface *intf)
1084{
1085 struct usbtmc_device_data *data;
1086
1087 dev_dbg(&intf->dev, "usbtmc_disconnect called\n");
1088
1089 data = usb_get_intfdata(intf);
1090 usb_deregister_dev(intf, &usbtmc_class);
1091 sysfs_remove_group(&intf->dev.kobj, &capability_attr_grp);
1092 sysfs_remove_group(&intf->dev.kobj, &data_attr_grp);
1093 mutex_lock(&data->io_mutex);
1094 data->zombie = 1;
1095 mutex_unlock(&data->io_mutex);
1096 kref_put(&data->kref, usbtmc_delete);
1097}
1098
1099static int usbtmc_suspend(struct usb_interface *intf, pm_message_t message)
1100{
1101 /* this driver does not have pending URBs */
1102 return 0;
1103}
1104
1105static int usbtmc_resume(struct usb_interface *intf)
1106{
1107 return 0;
1108}
1109
1110static struct usb_driver usbtmc_driver = {
1111 .name = "usbtmc",
1112 .id_table = usbtmc_devices,
1113 .probe = usbtmc_probe,
1114 .disconnect = usbtmc_disconnect,
1115 .suspend = usbtmc_suspend,
1116 .resume = usbtmc_resume,
1117};
1118
1119module_usb_driver(usbtmc_driver);
1120
1121MODULE_LICENSE("GPL");