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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");
1// SPDX-License-Identifier: GPL-2.0+
2/**
3 * drivers/usb/class/usbtmc.c - USB Test & Measurement class driver
4 *
5 * Copyright (C) 2007 Stefan Kopp, Gechingen, Germany
6 * Copyright (C) 2008 Novell, Inc.
7 * Copyright (C) 2008 Greg Kroah-Hartman <gregkh@suse.de>
8 */
9
10#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11
12#include <linux/module.h>
13#include <linux/kernel.h>
14#include <linux/fs.h>
15#include <linux/uaccess.h>
16#include <linux/kref.h>
17#include <linux/slab.h>
18#include <linux/poll.h>
19#include <linux/mutex.h>
20#include <linux/usb.h>
21#include <linux/usb/tmc.h>
22
23
24#define RIGOL 1
25#define USBTMC_HEADER_SIZE 12
26#define USBTMC_MINOR_BASE 176
27
28/*
29 * Size of driver internal IO buffer. Must be multiple of 4 and at least as
30 * large as wMaxPacketSize (which is usually 512 bytes).
31 */
32#define USBTMC_SIZE_IOBUFFER 2048
33
34/* Default USB timeout (in milliseconds) */
35#define USBTMC_TIMEOUT 5000
36
37/*
38 * Maximum number of read cycles to empty bulk in endpoint during CLEAR and
39 * ABORT_BULK_IN requests. Ends the loop if (for whatever reason) a short
40 * packet is never read.
41 */
42#define USBTMC_MAX_READS_TO_CLEAR_BULK_IN 100
43
44static const struct usb_device_id usbtmc_devices[] = {
45 { USB_INTERFACE_INFO(USB_CLASS_APP_SPEC, 3, 0), },
46 { USB_INTERFACE_INFO(USB_CLASS_APP_SPEC, 3, 1), },
47 { 0, } /* terminating entry */
48};
49MODULE_DEVICE_TABLE(usb, usbtmc_devices);
50
51/*
52 * This structure is the capabilities for the device
53 * See section 4.2.1.8 of the USBTMC specification,
54 * and section 4.2.2 of the USBTMC usb488 subclass
55 * specification for details.
56 */
57struct usbtmc_dev_capabilities {
58 __u8 interface_capabilities;
59 __u8 device_capabilities;
60 __u8 usb488_interface_capabilities;
61 __u8 usb488_device_capabilities;
62};
63
64/* This structure holds private data for each USBTMC device. One copy is
65 * allocated for each USBTMC device in the driver's probe function.
66 */
67struct usbtmc_device_data {
68 const struct usb_device_id *id;
69 struct usb_device *usb_dev;
70 struct usb_interface *intf;
71
72 unsigned int bulk_in;
73 unsigned int bulk_out;
74
75 u8 bTag;
76 u8 bTag_last_write; /* needed for abort */
77 u8 bTag_last_read; /* needed for abort */
78
79 /* data for interrupt in endpoint handling */
80 u8 bNotify1;
81 u8 bNotify2;
82 u16 ifnum;
83 u8 iin_bTag;
84 u8 *iin_buffer;
85 atomic_t iin_data_valid;
86 unsigned int iin_ep;
87 int iin_ep_present;
88 int iin_interval;
89 struct urb *iin_urb;
90 u16 iin_wMaxPacketSize;
91 atomic_t srq_asserted;
92
93 /* coalesced usb488_caps from usbtmc_dev_capabilities */
94 __u8 usb488_caps;
95
96 u8 rigol_quirk;
97
98 /* attributes from the USB TMC spec for this device */
99 u8 TermChar;
100 bool TermCharEnabled;
101 bool auto_abort;
102
103 bool zombie; /* fd of disconnected device */
104
105 struct usbtmc_dev_capabilities capabilities;
106 struct kref kref;
107 struct mutex io_mutex; /* only one i/o function running at a time */
108 wait_queue_head_t waitq;
109 struct fasync_struct *fasync;
110};
111#define to_usbtmc_data(d) container_of(d, struct usbtmc_device_data, kref)
112
113struct usbtmc_ID_rigol_quirk {
114 __u16 idVendor;
115 __u16 idProduct;
116};
117
118static const struct usbtmc_ID_rigol_quirk usbtmc_id_quirk[] = {
119 { 0x1ab1, 0x0588 },
120 { 0x1ab1, 0x04b0 },
121 { 0, 0 }
122};
123
124/* Forward declarations */
125static struct usb_driver usbtmc_driver;
126
127static void usbtmc_delete(struct kref *kref)
128{
129 struct usbtmc_device_data *data = to_usbtmc_data(kref);
130
131 usb_put_dev(data->usb_dev);
132 kfree(data);
133}
134
135static int usbtmc_open(struct inode *inode, struct file *filp)
136{
137 struct usb_interface *intf;
138 struct usbtmc_device_data *data;
139 int retval = 0;
140
141 intf = usb_find_interface(&usbtmc_driver, iminor(inode));
142 if (!intf) {
143 pr_err("can not find device for minor %d", iminor(inode));
144 return -ENODEV;
145 }
146
147 data = usb_get_intfdata(intf);
148 /* Protect reference to data from file structure until release */
149 kref_get(&data->kref);
150
151 /* Store pointer in file structure's private data field */
152 filp->private_data = data;
153
154 return retval;
155}
156
157static int usbtmc_release(struct inode *inode, struct file *file)
158{
159 struct usbtmc_device_data *data = file->private_data;
160
161 kref_put(&data->kref, usbtmc_delete);
162 return 0;
163}
164
165static int usbtmc_ioctl_abort_bulk_in(struct usbtmc_device_data *data)
166{
167 u8 *buffer;
168 struct device *dev;
169 int rv;
170 int n;
171 int actual;
172 struct usb_host_interface *current_setting;
173 int max_size;
174
175 dev = &data->intf->dev;
176 buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL);
177 if (!buffer)
178 return -ENOMEM;
179
180 rv = usb_control_msg(data->usb_dev,
181 usb_rcvctrlpipe(data->usb_dev, 0),
182 USBTMC_REQUEST_INITIATE_ABORT_BULK_IN,
183 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT,
184 data->bTag_last_read, data->bulk_in,
185 buffer, 2, USBTMC_TIMEOUT);
186
187 if (rv < 0) {
188 dev_err(dev, "usb_control_msg returned %d\n", rv);
189 goto exit;
190 }
191
192 dev_dbg(dev, "INITIATE_ABORT_BULK_IN returned %x\n", buffer[0]);
193
194 if (buffer[0] == USBTMC_STATUS_FAILED) {
195 rv = 0;
196 goto exit;
197 }
198
199 if (buffer[0] != USBTMC_STATUS_SUCCESS) {
200 dev_err(dev, "INITIATE_ABORT_BULK_IN returned %x\n",
201 buffer[0]);
202 rv = -EPERM;
203 goto exit;
204 }
205
206 max_size = 0;
207 current_setting = data->intf->cur_altsetting;
208 for (n = 0; n < current_setting->desc.bNumEndpoints; n++)
209 if (current_setting->endpoint[n].desc.bEndpointAddress ==
210 data->bulk_in)
211 max_size = usb_endpoint_maxp(¤t_setting->endpoint[n].desc);
212
213 if (max_size == 0) {
214 dev_err(dev, "Couldn't get wMaxPacketSize\n");
215 rv = -EPERM;
216 goto exit;
217 }
218
219 dev_dbg(&data->intf->dev, "wMaxPacketSize is %d\n", max_size);
220
221 n = 0;
222
223 do {
224 dev_dbg(dev, "Reading from bulk in EP\n");
225
226 rv = usb_bulk_msg(data->usb_dev,
227 usb_rcvbulkpipe(data->usb_dev,
228 data->bulk_in),
229 buffer, USBTMC_SIZE_IOBUFFER,
230 &actual, USBTMC_TIMEOUT);
231
232 n++;
233
234 if (rv < 0) {
235 dev_err(dev, "usb_bulk_msg returned %d\n", rv);
236 goto exit;
237 }
238 } while ((actual == max_size) &&
239 (n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN));
240
241 if (actual == max_size) {
242 dev_err(dev, "Couldn't clear device buffer within %d cycles\n",
243 USBTMC_MAX_READS_TO_CLEAR_BULK_IN);
244 rv = -EPERM;
245 goto exit;
246 }
247
248 n = 0;
249
250usbtmc_abort_bulk_in_status:
251 rv = usb_control_msg(data->usb_dev,
252 usb_rcvctrlpipe(data->usb_dev, 0),
253 USBTMC_REQUEST_CHECK_ABORT_BULK_IN_STATUS,
254 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT,
255 0, data->bulk_in, buffer, 0x08,
256 USBTMC_TIMEOUT);
257
258 if (rv < 0) {
259 dev_err(dev, "usb_control_msg returned %d\n", rv);
260 goto exit;
261 }
262
263 dev_dbg(dev, "INITIATE_ABORT_BULK_IN returned %x\n", buffer[0]);
264
265 if (buffer[0] == USBTMC_STATUS_SUCCESS) {
266 rv = 0;
267 goto exit;
268 }
269
270 if (buffer[0] != USBTMC_STATUS_PENDING) {
271 dev_err(dev, "INITIATE_ABORT_BULK_IN returned %x\n", buffer[0]);
272 rv = -EPERM;
273 goto exit;
274 }
275
276 if (buffer[1] == 1)
277 do {
278 dev_dbg(dev, "Reading from bulk in EP\n");
279
280 rv = usb_bulk_msg(data->usb_dev,
281 usb_rcvbulkpipe(data->usb_dev,
282 data->bulk_in),
283 buffer, USBTMC_SIZE_IOBUFFER,
284 &actual, USBTMC_TIMEOUT);
285
286 n++;
287
288 if (rv < 0) {
289 dev_err(dev, "usb_bulk_msg returned %d\n", rv);
290 goto exit;
291 }
292 } while ((actual == max_size) &&
293 (n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN));
294
295 if (actual == max_size) {
296 dev_err(dev, "Couldn't clear device buffer within %d cycles\n",
297 USBTMC_MAX_READS_TO_CLEAR_BULK_IN);
298 rv = -EPERM;
299 goto exit;
300 }
301
302 goto usbtmc_abort_bulk_in_status;
303
304exit:
305 kfree(buffer);
306 return rv;
307
308}
309
310static int usbtmc_ioctl_abort_bulk_out(struct usbtmc_device_data *data)
311{
312 struct device *dev;
313 u8 *buffer;
314 int rv;
315 int n;
316
317 dev = &data->intf->dev;
318
319 buffer = kmalloc(8, GFP_KERNEL);
320 if (!buffer)
321 return -ENOMEM;
322
323 rv = usb_control_msg(data->usb_dev,
324 usb_rcvctrlpipe(data->usb_dev, 0),
325 USBTMC_REQUEST_INITIATE_ABORT_BULK_OUT,
326 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT,
327 data->bTag_last_write, data->bulk_out,
328 buffer, 2, USBTMC_TIMEOUT);
329
330 if (rv < 0) {
331 dev_err(dev, "usb_control_msg returned %d\n", rv);
332 goto exit;
333 }
334
335 dev_dbg(dev, "INITIATE_ABORT_BULK_OUT returned %x\n", buffer[0]);
336
337 if (buffer[0] != USBTMC_STATUS_SUCCESS) {
338 dev_err(dev, "INITIATE_ABORT_BULK_OUT returned %x\n",
339 buffer[0]);
340 rv = -EPERM;
341 goto exit;
342 }
343
344 n = 0;
345
346usbtmc_abort_bulk_out_check_status:
347 rv = usb_control_msg(data->usb_dev,
348 usb_rcvctrlpipe(data->usb_dev, 0),
349 USBTMC_REQUEST_CHECK_ABORT_BULK_OUT_STATUS,
350 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT,
351 0, data->bulk_out, buffer, 0x08,
352 USBTMC_TIMEOUT);
353 n++;
354 if (rv < 0) {
355 dev_err(dev, "usb_control_msg returned %d\n", rv);
356 goto exit;
357 }
358
359 dev_dbg(dev, "CHECK_ABORT_BULK_OUT returned %x\n", buffer[0]);
360
361 if (buffer[0] == USBTMC_STATUS_SUCCESS)
362 goto usbtmc_abort_bulk_out_clear_halt;
363
364 if ((buffer[0] == USBTMC_STATUS_PENDING) &&
365 (n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN))
366 goto usbtmc_abort_bulk_out_check_status;
367
368 rv = -EPERM;
369 goto exit;
370
371usbtmc_abort_bulk_out_clear_halt:
372 rv = usb_clear_halt(data->usb_dev,
373 usb_sndbulkpipe(data->usb_dev, data->bulk_out));
374
375 if (rv < 0) {
376 dev_err(dev, "usb_control_msg returned %d\n", rv);
377 goto exit;
378 }
379 rv = 0;
380
381exit:
382 kfree(buffer);
383 return rv;
384}
385
386static int usbtmc488_ioctl_read_stb(struct usbtmc_device_data *data,
387 void __user *arg)
388{
389 struct device *dev = &data->intf->dev;
390 u8 *buffer;
391 u8 tag;
392 __u8 stb;
393 int rv;
394
395 dev_dbg(dev, "Enter ioctl_read_stb iin_ep_present: %d\n",
396 data->iin_ep_present);
397
398 buffer = kmalloc(8, GFP_KERNEL);
399 if (!buffer)
400 return -ENOMEM;
401
402 atomic_set(&data->iin_data_valid, 0);
403
404 /* must issue read_stb before using poll or select */
405 atomic_set(&data->srq_asserted, 0);
406
407 rv = usb_control_msg(data->usb_dev,
408 usb_rcvctrlpipe(data->usb_dev, 0),
409 USBTMC488_REQUEST_READ_STATUS_BYTE,
410 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
411 data->iin_bTag,
412 data->ifnum,
413 buffer, 0x03, USBTMC_TIMEOUT);
414 if (rv < 0) {
415 dev_err(dev, "stb usb_control_msg returned %d\n", rv);
416 goto exit;
417 }
418
419 if (buffer[0] != USBTMC_STATUS_SUCCESS) {
420 dev_err(dev, "control status returned %x\n", buffer[0]);
421 rv = -EIO;
422 goto exit;
423 }
424
425 if (data->iin_ep_present) {
426 rv = wait_event_interruptible_timeout(
427 data->waitq,
428 atomic_read(&data->iin_data_valid) != 0,
429 USBTMC_TIMEOUT);
430 if (rv < 0) {
431 dev_dbg(dev, "wait interrupted %d\n", rv);
432 goto exit;
433 }
434
435 if (rv == 0) {
436 dev_dbg(dev, "wait timed out\n");
437 rv = -ETIME;
438 goto exit;
439 }
440
441 tag = data->bNotify1 & 0x7f;
442 if (tag != data->iin_bTag) {
443 dev_err(dev, "expected bTag %x got %x\n",
444 data->iin_bTag, tag);
445 }
446
447 stb = data->bNotify2;
448 } else {
449 stb = buffer[2];
450 }
451
452 rv = copy_to_user(arg, &stb, sizeof(stb));
453 if (rv)
454 rv = -EFAULT;
455
456 exit:
457 /* bump interrupt bTag */
458 data->iin_bTag += 1;
459 if (data->iin_bTag > 127)
460 /* 1 is for SRQ see USBTMC-USB488 subclass spec section 4.3.1 */
461 data->iin_bTag = 2;
462
463 kfree(buffer);
464 return rv;
465}
466
467static int usbtmc488_ioctl_simple(struct usbtmc_device_data *data,
468 void __user *arg, unsigned int cmd)
469{
470 struct device *dev = &data->intf->dev;
471 __u8 val;
472 u8 *buffer;
473 u16 wValue;
474 int rv;
475
476 if (!(data->usb488_caps & USBTMC488_CAPABILITY_SIMPLE))
477 return -EINVAL;
478
479 buffer = kmalloc(8, GFP_KERNEL);
480 if (!buffer)
481 return -ENOMEM;
482
483 if (cmd == USBTMC488_REQUEST_REN_CONTROL) {
484 rv = copy_from_user(&val, arg, sizeof(val));
485 if (rv) {
486 rv = -EFAULT;
487 goto exit;
488 }
489 wValue = val ? 1 : 0;
490 } else {
491 wValue = 0;
492 }
493
494 rv = usb_control_msg(data->usb_dev,
495 usb_rcvctrlpipe(data->usb_dev, 0),
496 cmd,
497 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
498 wValue,
499 data->ifnum,
500 buffer, 0x01, USBTMC_TIMEOUT);
501 if (rv < 0) {
502 dev_err(dev, "simple usb_control_msg failed %d\n", rv);
503 goto exit;
504 } else if (rv != 1) {
505 dev_warn(dev, "simple usb_control_msg returned %d\n", rv);
506 rv = -EIO;
507 goto exit;
508 }
509
510 if (buffer[0] != USBTMC_STATUS_SUCCESS) {
511 dev_err(dev, "simple control status returned %x\n", buffer[0]);
512 rv = -EIO;
513 goto exit;
514 }
515 rv = 0;
516
517 exit:
518 kfree(buffer);
519 return rv;
520}
521
522/*
523 * Sends a REQUEST_DEV_DEP_MSG_IN message on the Bulk-OUT endpoint.
524 * @transfer_size: number of bytes to request from the device.
525 *
526 * See the USBTMC specification, Table 4.
527 *
528 * Also updates bTag_last_write.
529 */
530static int send_request_dev_dep_msg_in(struct usbtmc_device_data *data, size_t transfer_size)
531{
532 int retval;
533 u8 *buffer;
534 int actual;
535
536 buffer = kmalloc(USBTMC_HEADER_SIZE, GFP_KERNEL);
537 if (!buffer)
538 return -ENOMEM;
539 /* Setup IO buffer for REQUEST_DEV_DEP_MSG_IN message
540 * Refer to class specs for details
541 */
542 buffer[0] = 2;
543 buffer[1] = data->bTag;
544 buffer[2] = ~data->bTag;
545 buffer[3] = 0; /* Reserved */
546 buffer[4] = transfer_size >> 0;
547 buffer[5] = transfer_size >> 8;
548 buffer[6] = transfer_size >> 16;
549 buffer[7] = transfer_size >> 24;
550 buffer[8] = data->TermCharEnabled * 2;
551 /* Use term character? */
552 buffer[9] = data->TermChar;
553 buffer[10] = 0; /* Reserved */
554 buffer[11] = 0; /* Reserved */
555
556 /* Send bulk URB */
557 retval = usb_bulk_msg(data->usb_dev,
558 usb_sndbulkpipe(data->usb_dev,
559 data->bulk_out),
560 buffer, USBTMC_HEADER_SIZE, &actual, USBTMC_TIMEOUT);
561
562 /* Store bTag (in case we need to abort) */
563 data->bTag_last_write = data->bTag;
564
565 /* Increment bTag -- and increment again if zero */
566 data->bTag++;
567 if (!data->bTag)
568 data->bTag++;
569
570 kfree(buffer);
571 if (retval < 0) {
572 dev_err(&data->intf->dev, "usb_bulk_msg in send_request_dev_dep_msg_in() returned %d\n", retval);
573 return retval;
574 }
575
576 return 0;
577}
578
579static ssize_t usbtmc_read(struct file *filp, char __user *buf,
580 size_t count, loff_t *f_pos)
581{
582 struct usbtmc_device_data *data;
583 struct device *dev;
584 u32 n_characters;
585 u8 *buffer;
586 int actual;
587 size_t done;
588 size_t remaining;
589 int retval;
590 size_t this_part;
591
592 /* Get pointer to private data structure */
593 data = filp->private_data;
594 dev = &data->intf->dev;
595
596 buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL);
597 if (!buffer)
598 return -ENOMEM;
599
600 mutex_lock(&data->io_mutex);
601 if (data->zombie) {
602 retval = -ENODEV;
603 goto exit;
604 }
605
606 if (data->rigol_quirk) {
607 dev_dbg(dev, "usb_bulk_msg_in: count(%zu)\n", count);
608
609 retval = send_request_dev_dep_msg_in(data, count);
610
611 if (retval < 0) {
612 if (data->auto_abort)
613 usbtmc_ioctl_abort_bulk_out(data);
614 goto exit;
615 }
616 }
617
618 /* Loop until we have fetched everything we requested */
619 remaining = count;
620 this_part = remaining;
621 done = 0;
622
623 while (remaining > 0) {
624 if (!data->rigol_quirk) {
625 dev_dbg(dev, "usb_bulk_msg_in: remaining(%zu), count(%zu)\n", remaining, count);
626
627 if (remaining > USBTMC_SIZE_IOBUFFER - USBTMC_HEADER_SIZE - 3)
628 this_part = USBTMC_SIZE_IOBUFFER - USBTMC_HEADER_SIZE - 3;
629 else
630 this_part = remaining;
631
632 retval = send_request_dev_dep_msg_in(data, this_part);
633 if (retval < 0) {
634 dev_err(dev, "usb_bulk_msg returned %d\n", retval);
635 if (data->auto_abort)
636 usbtmc_ioctl_abort_bulk_out(data);
637 goto exit;
638 }
639 }
640
641 /* Send bulk URB */
642 retval = usb_bulk_msg(data->usb_dev,
643 usb_rcvbulkpipe(data->usb_dev,
644 data->bulk_in),
645 buffer, USBTMC_SIZE_IOBUFFER, &actual,
646 USBTMC_TIMEOUT);
647
648 dev_dbg(dev, "usb_bulk_msg: retval(%u), done(%zu), remaining(%zu), actual(%d)\n", retval, done, remaining, actual);
649
650 /* Store bTag (in case we need to abort) */
651 data->bTag_last_read = data->bTag;
652
653 if (retval < 0) {
654 dev_dbg(dev, "Unable to read data, error %d\n", retval);
655 if (data->auto_abort)
656 usbtmc_ioctl_abort_bulk_in(data);
657 goto exit;
658 }
659
660 /* Parse header in first packet */
661 if ((done == 0) || !data->rigol_quirk) {
662 /* Sanity checks for the header */
663 if (actual < USBTMC_HEADER_SIZE) {
664 dev_err(dev, "Device sent too small first packet: %u < %u\n", actual, USBTMC_HEADER_SIZE);
665 if (data->auto_abort)
666 usbtmc_ioctl_abort_bulk_in(data);
667 goto exit;
668 }
669
670 if (buffer[0] != 2) {
671 dev_err(dev, "Device sent reply with wrong MsgID: %u != 2\n", buffer[0]);
672 if (data->auto_abort)
673 usbtmc_ioctl_abort_bulk_in(data);
674 goto exit;
675 }
676
677 if (buffer[1] != data->bTag_last_write) {
678 dev_err(dev, "Device sent reply with wrong bTag: %u != %u\n", buffer[1], data->bTag_last_write);
679 if (data->auto_abort)
680 usbtmc_ioctl_abort_bulk_in(data);
681 goto exit;
682 }
683
684 /* How many characters did the instrument send? */
685 n_characters = buffer[4] +
686 (buffer[5] << 8) +
687 (buffer[6] << 16) +
688 (buffer[7] << 24);
689
690 if (n_characters > this_part) {
691 dev_err(dev, "Device wants to return more data than requested: %u > %zu\n", n_characters, count);
692 if (data->auto_abort)
693 usbtmc_ioctl_abort_bulk_in(data);
694 goto exit;
695 }
696
697 /* Remove the USBTMC header */
698 actual -= USBTMC_HEADER_SIZE;
699
700 /* Check if the message is smaller than requested */
701 if (data->rigol_quirk) {
702 if (remaining > n_characters)
703 remaining = n_characters;
704 /* Remove padding if it exists */
705 if (actual > remaining)
706 actual = remaining;
707 }
708 else {
709 if (this_part > n_characters)
710 this_part = n_characters;
711 /* Remove padding if it exists */
712 if (actual > this_part)
713 actual = this_part;
714 }
715
716 dev_dbg(dev, "Bulk-IN header: N_characters(%u), bTransAttr(%u)\n", n_characters, buffer[8]);
717
718 remaining -= actual;
719
720 /* Terminate if end-of-message bit received from device */
721 if ((buffer[8] & 0x01) && (actual >= n_characters))
722 remaining = 0;
723
724 dev_dbg(dev, "Bulk-IN header: remaining(%zu), buf(%p), buffer(%p) done(%zu)\n", remaining,buf,buffer,done);
725
726
727 /* Copy buffer to user space */
728 if (copy_to_user(buf + done, &buffer[USBTMC_HEADER_SIZE], actual)) {
729 /* There must have been an addressing problem */
730 retval = -EFAULT;
731 goto exit;
732 }
733 done += actual;
734 }
735 else {
736 if (actual > remaining)
737 actual = remaining;
738
739 remaining -= actual;
740
741 dev_dbg(dev, "Bulk-IN header cont: actual(%u), done(%zu), remaining(%zu), buf(%p), buffer(%p)\n", actual, done, remaining,buf,buffer);
742
743 /* Copy buffer to user space */
744 if (copy_to_user(buf + done, buffer, actual)) {
745 /* There must have been an addressing problem */
746 retval = -EFAULT;
747 goto exit;
748 }
749 done += actual;
750 }
751 }
752
753 /* Update file position value */
754 *f_pos = *f_pos + done;
755 retval = done;
756
757exit:
758 mutex_unlock(&data->io_mutex);
759 kfree(buffer);
760 return retval;
761}
762
763static ssize_t usbtmc_write(struct file *filp, const char __user *buf,
764 size_t count, loff_t *f_pos)
765{
766 struct usbtmc_device_data *data;
767 u8 *buffer;
768 int retval;
769 int actual;
770 unsigned long int n_bytes;
771 int remaining;
772 int done;
773 int this_part;
774
775 data = filp->private_data;
776
777 buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL);
778 if (!buffer)
779 return -ENOMEM;
780
781 mutex_lock(&data->io_mutex);
782 if (data->zombie) {
783 retval = -ENODEV;
784 goto exit;
785 }
786
787 remaining = count;
788 done = 0;
789
790 while (remaining > 0) {
791 if (remaining > USBTMC_SIZE_IOBUFFER - USBTMC_HEADER_SIZE) {
792 this_part = USBTMC_SIZE_IOBUFFER - USBTMC_HEADER_SIZE;
793 buffer[8] = 0;
794 } else {
795 this_part = remaining;
796 buffer[8] = 1;
797 }
798
799 /* Setup IO buffer for DEV_DEP_MSG_OUT message */
800 buffer[0] = 1;
801 buffer[1] = data->bTag;
802 buffer[2] = ~data->bTag;
803 buffer[3] = 0; /* Reserved */
804 buffer[4] = this_part >> 0;
805 buffer[5] = this_part >> 8;
806 buffer[6] = this_part >> 16;
807 buffer[7] = this_part >> 24;
808 /* buffer[8] is set above... */
809 buffer[9] = 0; /* Reserved */
810 buffer[10] = 0; /* Reserved */
811 buffer[11] = 0; /* Reserved */
812
813 if (copy_from_user(&buffer[USBTMC_HEADER_SIZE], buf + done, this_part)) {
814 retval = -EFAULT;
815 goto exit;
816 }
817
818 n_bytes = roundup(USBTMC_HEADER_SIZE + this_part, 4);
819 memset(buffer + USBTMC_HEADER_SIZE + this_part, 0, n_bytes - (USBTMC_HEADER_SIZE + this_part));
820
821 do {
822 retval = usb_bulk_msg(data->usb_dev,
823 usb_sndbulkpipe(data->usb_dev,
824 data->bulk_out),
825 buffer, n_bytes,
826 &actual, USBTMC_TIMEOUT);
827 if (retval != 0)
828 break;
829 n_bytes -= actual;
830 } while (n_bytes);
831
832 data->bTag_last_write = data->bTag;
833 data->bTag++;
834
835 if (!data->bTag)
836 data->bTag++;
837
838 if (retval < 0) {
839 dev_err(&data->intf->dev,
840 "Unable to send data, error %d\n", retval);
841 if (data->auto_abort)
842 usbtmc_ioctl_abort_bulk_out(data);
843 goto exit;
844 }
845
846 remaining -= this_part;
847 done += this_part;
848 }
849
850 retval = count;
851exit:
852 mutex_unlock(&data->io_mutex);
853 kfree(buffer);
854 return retval;
855}
856
857static int usbtmc_ioctl_clear(struct usbtmc_device_data *data)
858{
859 struct usb_host_interface *current_setting;
860 struct usb_endpoint_descriptor *desc;
861 struct device *dev;
862 u8 *buffer;
863 int rv;
864 int n;
865 int actual = 0;
866 int max_size;
867
868 dev = &data->intf->dev;
869
870 dev_dbg(dev, "Sending INITIATE_CLEAR request\n");
871
872 buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL);
873 if (!buffer)
874 return -ENOMEM;
875
876 rv = usb_control_msg(data->usb_dev,
877 usb_rcvctrlpipe(data->usb_dev, 0),
878 USBTMC_REQUEST_INITIATE_CLEAR,
879 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
880 0, 0, buffer, 1, USBTMC_TIMEOUT);
881 if (rv < 0) {
882 dev_err(dev, "usb_control_msg returned %d\n", rv);
883 goto exit;
884 }
885
886 dev_dbg(dev, "INITIATE_CLEAR returned %x\n", buffer[0]);
887
888 if (buffer[0] != USBTMC_STATUS_SUCCESS) {
889 dev_err(dev, "INITIATE_CLEAR returned %x\n", buffer[0]);
890 rv = -EPERM;
891 goto exit;
892 }
893
894 max_size = 0;
895 current_setting = data->intf->cur_altsetting;
896 for (n = 0; n < current_setting->desc.bNumEndpoints; n++) {
897 desc = ¤t_setting->endpoint[n].desc;
898 if (desc->bEndpointAddress == data->bulk_in)
899 max_size = usb_endpoint_maxp(desc);
900 }
901
902 if (max_size == 0) {
903 dev_err(dev, "Couldn't get wMaxPacketSize\n");
904 rv = -EPERM;
905 goto exit;
906 }
907
908 dev_dbg(dev, "wMaxPacketSize is %d\n", max_size);
909
910 n = 0;
911
912usbtmc_clear_check_status:
913
914 dev_dbg(dev, "Sending CHECK_CLEAR_STATUS request\n");
915
916 rv = usb_control_msg(data->usb_dev,
917 usb_rcvctrlpipe(data->usb_dev, 0),
918 USBTMC_REQUEST_CHECK_CLEAR_STATUS,
919 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
920 0, 0, buffer, 2, USBTMC_TIMEOUT);
921 if (rv < 0) {
922 dev_err(dev, "usb_control_msg returned %d\n", rv);
923 goto exit;
924 }
925
926 dev_dbg(dev, "CHECK_CLEAR_STATUS returned %x\n", buffer[0]);
927
928 if (buffer[0] == USBTMC_STATUS_SUCCESS)
929 goto usbtmc_clear_bulk_out_halt;
930
931 if (buffer[0] != USBTMC_STATUS_PENDING) {
932 dev_err(dev, "CHECK_CLEAR_STATUS returned %x\n", buffer[0]);
933 rv = -EPERM;
934 goto exit;
935 }
936
937 if (buffer[1] == 1)
938 do {
939 dev_dbg(dev, "Reading from bulk in EP\n");
940
941 rv = usb_bulk_msg(data->usb_dev,
942 usb_rcvbulkpipe(data->usb_dev,
943 data->bulk_in),
944 buffer, USBTMC_SIZE_IOBUFFER,
945 &actual, USBTMC_TIMEOUT);
946 n++;
947
948 if (rv < 0) {
949 dev_err(dev, "usb_control_msg returned %d\n",
950 rv);
951 goto exit;
952 }
953 } while ((actual == max_size) &&
954 (n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN));
955
956 if (actual == max_size) {
957 dev_err(dev, "Couldn't clear device buffer within %d cycles\n",
958 USBTMC_MAX_READS_TO_CLEAR_BULK_IN);
959 rv = -EPERM;
960 goto exit;
961 }
962
963 goto usbtmc_clear_check_status;
964
965usbtmc_clear_bulk_out_halt:
966
967 rv = usb_clear_halt(data->usb_dev,
968 usb_sndbulkpipe(data->usb_dev, data->bulk_out));
969 if (rv < 0) {
970 dev_err(dev, "usb_control_msg returned %d\n", rv);
971 goto exit;
972 }
973 rv = 0;
974
975exit:
976 kfree(buffer);
977 return rv;
978}
979
980static int usbtmc_ioctl_clear_out_halt(struct usbtmc_device_data *data)
981{
982 int rv;
983
984 rv = usb_clear_halt(data->usb_dev,
985 usb_sndbulkpipe(data->usb_dev, data->bulk_out));
986
987 if (rv < 0) {
988 dev_err(&data->usb_dev->dev, "usb_control_msg returned %d\n",
989 rv);
990 return rv;
991 }
992 return 0;
993}
994
995static int usbtmc_ioctl_clear_in_halt(struct usbtmc_device_data *data)
996{
997 int rv;
998
999 rv = usb_clear_halt(data->usb_dev,
1000 usb_rcvbulkpipe(data->usb_dev, data->bulk_in));
1001
1002 if (rv < 0) {
1003 dev_err(&data->usb_dev->dev, "usb_control_msg returned %d\n",
1004 rv);
1005 return rv;
1006 }
1007 return 0;
1008}
1009
1010static int get_capabilities(struct usbtmc_device_data *data)
1011{
1012 struct device *dev = &data->usb_dev->dev;
1013 char *buffer;
1014 int rv = 0;
1015
1016 buffer = kmalloc(0x18, GFP_KERNEL);
1017 if (!buffer)
1018 return -ENOMEM;
1019
1020 rv = usb_control_msg(data->usb_dev, usb_rcvctrlpipe(data->usb_dev, 0),
1021 USBTMC_REQUEST_GET_CAPABILITIES,
1022 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
1023 0, 0, buffer, 0x18, USBTMC_TIMEOUT);
1024 if (rv < 0) {
1025 dev_err(dev, "usb_control_msg returned %d\n", rv);
1026 goto err_out;
1027 }
1028
1029 dev_dbg(dev, "GET_CAPABILITIES returned %x\n", buffer[0]);
1030 if (buffer[0] != USBTMC_STATUS_SUCCESS) {
1031 dev_err(dev, "GET_CAPABILITIES returned %x\n", buffer[0]);
1032 rv = -EPERM;
1033 goto err_out;
1034 }
1035 dev_dbg(dev, "Interface capabilities are %x\n", buffer[4]);
1036 dev_dbg(dev, "Device capabilities are %x\n", buffer[5]);
1037 dev_dbg(dev, "USB488 interface capabilities are %x\n", buffer[14]);
1038 dev_dbg(dev, "USB488 device capabilities are %x\n", buffer[15]);
1039
1040 data->capabilities.interface_capabilities = buffer[4];
1041 data->capabilities.device_capabilities = buffer[5];
1042 data->capabilities.usb488_interface_capabilities = buffer[14];
1043 data->capabilities.usb488_device_capabilities = buffer[15];
1044 data->usb488_caps = (buffer[14] & 0x07) | ((buffer[15] & 0x0f) << 4);
1045 rv = 0;
1046
1047err_out:
1048 kfree(buffer);
1049 return rv;
1050}
1051
1052#define capability_attribute(name) \
1053static ssize_t name##_show(struct device *dev, \
1054 struct device_attribute *attr, char *buf) \
1055{ \
1056 struct usb_interface *intf = to_usb_interface(dev); \
1057 struct usbtmc_device_data *data = usb_get_intfdata(intf); \
1058 \
1059 return sprintf(buf, "%d\n", data->capabilities.name); \
1060} \
1061static DEVICE_ATTR_RO(name)
1062
1063capability_attribute(interface_capabilities);
1064capability_attribute(device_capabilities);
1065capability_attribute(usb488_interface_capabilities);
1066capability_attribute(usb488_device_capabilities);
1067
1068static struct attribute *capability_attrs[] = {
1069 &dev_attr_interface_capabilities.attr,
1070 &dev_attr_device_capabilities.attr,
1071 &dev_attr_usb488_interface_capabilities.attr,
1072 &dev_attr_usb488_device_capabilities.attr,
1073 NULL,
1074};
1075
1076static const struct attribute_group capability_attr_grp = {
1077 .attrs = capability_attrs,
1078};
1079
1080static ssize_t TermChar_show(struct device *dev,
1081 struct device_attribute *attr, char *buf)
1082{
1083 struct usb_interface *intf = to_usb_interface(dev);
1084 struct usbtmc_device_data *data = usb_get_intfdata(intf);
1085
1086 return sprintf(buf, "%c\n", data->TermChar);
1087}
1088
1089static ssize_t TermChar_store(struct device *dev,
1090 struct device_attribute *attr,
1091 const char *buf, size_t count)
1092{
1093 struct usb_interface *intf = to_usb_interface(dev);
1094 struct usbtmc_device_data *data = usb_get_intfdata(intf);
1095
1096 if (count < 1)
1097 return -EINVAL;
1098 data->TermChar = buf[0];
1099 return count;
1100}
1101static DEVICE_ATTR_RW(TermChar);
1102
1103#define data_attribute(name) \
1104static ssize_t name##_show(struct device *dev, \
1105 struct device_attribute *attr, char *buf) \
1106{ \
1107 struct usb_interface *intf = to_usb_interface(dev); \
1108 struct usbtmc_device_data *data = usb_get_intfdata(intf); \
1109 \
1110 return sprintf(buf, "%d\n", data->name); \
1111} \
1112static ssize_t name##_store(struct device *dev, \
1113 struct device_attribute *attr, \
1114 const char *buf, size_t count) \
1115{ \
1116 struct usb_interface *intf = to_usb_interface(dev); \
1117 struct usbtmc_device_data *data = usb_get_intfdata(intf); \
1118 ssize_t result; \
1119 unsigned val; \
1120 \
1121 result = sscanf(buf, "%u\n", &val); \
1122 if (result != 1) \
1123 result = -EINVAL; \
1124 data->name = val; \
1125 if (result < 0) \
1126 return result; \
1127 else \
1128 return count; \
1129} \
1130static DEVICE_ATTR_RW(name)
1131
1132data_attribute(TermCharEnabled);
1133data_attribute(auto_abort);
1134
1135static struct attribute *data_attrs[] = {
1136 &dev_attr_TermChar.attr,
1137 &dev_attr_TermCharEnabled.attr,
1138 &dev_attr_auto_abort.attr,
1139 NULL,
1140};
1141
1142static const struct attribute_group data_attr_grp = {
1143 .attrs = data_attrs,
1144};
1145
1146static int usbtmc_ioctl_indicator_pulse(struct usbtmc_device_data *data)
1147{
1148 struct device *dev;
1149 u8 *buffer;
1150 int rv;
1151
1152 dev = &data->intf->dev;
1153
1154 buffer = kmalloc(2, GFP_KERNEL);
1155 if (!buffer)
1156 return -ENOMEM;
1157
1158 rv = usb_control_msg(data->usb_dev,
1159 usb_rcvctrlpipe(data->usb_dev, 0),
1160 USBTMC_REQUEST_INDICATOR_PULSE,
1161 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
1162 0, 0, buffer, 0x01, USBTMC_TIMEOUT);
1163
1164 if (rv < 0) {
1165 dev_err(dev, "usb_control_msg returned %d\n", rv);
1166 goto exit;
1167 }
1168
1169 dev_dbg(dev, "INDICATOR_PULSE returned %x\n", buffer[0]);
1170
1171 if (buffer[0] != USBTMC_STATUS_SUCCESS) {
1172 dev_err(dev, "INDICATOR_PULSE returned %x\n", buffer[0]);
1173 rv = -EPERM;
1174 goto exit;
1175 }
1176 rv = 0;
1177
1178exit:
1179 kfree(buffer);
1180 return rv;
1181}
1182
1183static long usbtmc_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1184{
1185 struct usbtmc_device_data *data;
1186 int retval = -EBADRQC;
1187
1188 data = file->private_data;
1189 mutex_lock(&data->io_mutex);
1190 if (data->zombie) {
1191 retval = -ENODEV;
1192 goto skip_io_on_zombie;
1193 }
1194
1195 switch (cmd) {
1196 case USBTMC_IOCTL_CLEAR_OUT_HALT:
1197 retval = usbtmc_ioctl_clear_out_halt(data);
1198 break;
1199
1200 case USBTMC_IOCTL_CLEAR_IN_HALT:
1201 retval = usbtmc_ioctl_clear_in_halt(data);
1202 break;
1203
1204 case USBTMC_IOCTL_INDICATOR_PULSE:
1205 retval = usbtmc_ioctl_indicator_pulse(data);
1206 break;
1207
1208 case USBTMC_IOCTL_CLEAR:
1209 retval = usbtmc_ioctl_clear(data);
1210 break;
1211
1212 case USBTMC_IOCTL_ABORT_BULK_OUT:
1213 retval = usbtmc_ioctl_abort_bulk_out(data);
1214 break;
1215
1216 case USBTMC_IOCTL_ABORT_BULK_IN:
1217 retval = usbtmc_ioctl_abort_bulk_in(data);
1218 break;
1219
1220 case USBTMC488_IOCTL_GET_CAPS:
1221 retval = copy_to_user((void __user *)arg,
1222 &data->usb488_caps,
1223 sizeof(data->usb488_caps));
1224 if (retval)
1225 retval = -EFAULT;
1226 break;
1227
1228 case USBTMC488_IOCTL_READ_STB:
1229 retval = usbtmc488_ioctl_read_stb(data, (void __user *)arg);
1230 break;
1231
1232 case USBTMC488_IOCTL_REN_CONTROL:
1233 retval = usbtmc488_ioctl_simple(data, (void __user *)arg,
1234 USBTMC488_REQUEST_REN_CONTROL);
1235 break;
1236
1237 case USBTMC488_IOCTL_GOTO_LOCAL:
1238 retval = usbtmc488_ioctl_simple(data, (void __user *)arg,
1239 USBTMC488_REQUEST_GOTO_LOCAL);
1240 break;
1241
1242 case USBTMC488_IOCTL_LOCAL_LOCKOUT:
1243 retval = usbtmc488_ioctl_simple(data, (void __user *)arg,
1244 USBTMC488_REQUEST_LOCAL_LOCKOUT);
1245 break;
1246 }
1247
1248skip_io_on_zombie:
1249 mutex_unlock(&data->io_mutex);
1250 return retval;
1251}
1252
1253static int usbtmc_fasync(int fd, struct file *file, int on)
1254{
1255 struct usbtmc_device_data *data = file->private_data;
1256
1257 return fasync_helper(fd, file, on, &data->fasync);
1258}
1259
1260static __poll_t usbtmc_poll(struct file *file, poll_table *wait)
1261{
1262 struct usbtmc_device_data *data = file->private_data;
1263 __poll_t mask;
1264
1265 mutex_lock(&data->io_mutex);
1266
1267 if (data->zombie) {
1268 mask = EPOLLHUP | EPOLLERR;
1269 goto no_poll;
1270 }
1271
1272 poll_wait(file, &data->waitq, wait);
1273
1274 mask = (atomic_read(&data->srq_asserted)) ? EPOLLIN | EPOLLRDNORM : 0;
1275
1276no_poll:
1277 mutex_unlock(&data->io_mutex);
1278 return mask;
1279}
1280
1281static const struct file_operations fops = {
1282 .owner = THIS_MODULE,
1283 .read = usbtmc_read,
1284 .write = usbtmc_write,
1285 .open = usbtmc_open,
1286 .release = usbtmc_release,
1287 .unlocked_ioctl = usbtmc_ioctl,
1288 .fasync = usbtmc_fasync,
1289 .poll = usbtmc_poll,
1290 .llseek = default_llseek,
1291};
1292
1293static struct usb_class_driver usbtmc_class = {
1294 .name = "usbtmc%d",
1295 .fops = &fops,
1296 .minor_base = USBTMC_MINOR_BASE,
1297};
1298
1299static void usbtmc_interrupt(struct urb *urb)
1300{
1301 struct usbtmc_device_data *data = urb->context;
1302 struct device *dev = &data->intf->dev;
1303 int status = urb->status;
1304 int rv;
1305
1306 dev_dbg(&data->intf->dev, "int status: %d len %d\n",
1307 status, urb->actual_length);
1308
1309 switch (status) {
1310 case 0: /* SUCCESS */
1311 /* check for valid STB notification */
1312 if (data->iin_buffer[0] > 0x81) {
1313 data->bNotify1 = data->iin_buffer[0];
1314 data->bNotify2 = data->iin_buffer[1];
1315 atomic_set(&data->iin_data_valid, 1);
1316 wake_up_interruptible(&data->waitq);
1317 goto exit;
1318 }
1319 /* check for SRQ notification */
1320 if (data->iin_buffer[0] == 0x81) {
1321 if (data->fasync)
1322 kill_fasync(&data->fasync,
1323 SIGIO, POLL_IN);
1324
1325 atomic_set(&data->srq_asserted, 1);
1326 wake_up_interruptible(&data->waitq);
1327 goto exit;
1328 }
1329 dev_warn(dev, "invalid notification: %x\n", data->iin_buffer[0]);
1330 break;
1331 case -EOVERFLOW:
1332 dev_err(dev, "overflow with length %d, actual length is %d\n",
1333 data->iin_wMaxPacketSize, urb->actual_length);
1334 /* fall through */
1335 case -ECONNRESET:
1336 case -ENOENT:
1337 case -ESHUTDOWN:
1338 case -EILSEQ:
1339 case -ETIME:
1340 /* urb terminated, clean up */
1341 dev_dbg(dev, "urb terminated, status: %d\n", status);
1342 return;
1343 default:
1344 dev_err(dev, "unknown status received: %d\n", status);
1345 }
1346exit:
1347 rv = usb_submit_urb(urb, GFP_ATOMIC);
1348 if (rv)
1349 dev_err(dev, "usb_submit_urb failed: %d\n", rv);
1350}
1351
1352static void usbtmc_free_int(struct usbtmc_device_data *data)
1353{
1354 if (!data->iin_ep_present || !data->iin_urb)
1355 return;
1356 usb_kill_urb(data->iin_urb);
1357 kfree(data->iin_buffer);
1358 usb_free_urb(data->iin_urb);
1359 kref_put(&data->kref, usbtmc_delete);
1360}
1361
1362static int usbtmc_probe(struct usb_interface *intf,
1363 const struct usb_device_id *id)
1364{
1365 struct usbtmc_device_data *data;
1366 struct usb_host_interface *iface_desc;
1367 struct usb_endpoint_descriptor *bulk_in, *bulk_out, *int_in;
1368 int n;
1369 int retcode;
1370
1371 dev_dbg(&intf->dev, "%s called\n", __func__);
1372
1373 data = kzalloc(sizeof(*data), GFP_KERNEL);
1374 if (!data)
1375 return -ENOMEM;
1376
1377 data->intf = intf;
1378 data->id = id;
1379 data->usb_dev = usb_get_dev(interface_to_usbdev(intf));
1380 usb_set_intfdata(intf, data);
1381 kref_init(&data->kref);
1382 mutex_init(&data->io_mutex);
1383 init_waitqueue_head(&data->waitq);
1384 atomic_set(&data->iin_data_valid, 0);
1385 atomic_set(&data->srq_asserted, 0);
1386 data->zombie = 0;
1387
1388 /* Determine if it is a Rigol or not */
1389 data->rigol_quirk = 0;
1390 dev_dbg(&intf->dev, "Trying to find if device Vendor 0x%04X Product 0x%04X has the RIGOL quirk\n",
1391 le16_to_cpu(data->usb_dev->descriptor.idVendor),
1392 le16_to_cpu(data->usb_dev->descriptor.idProduct));
1393 for(n = 0; usbtmc_id_quirk[n].idVendor > 0; n++) {
1394 if ((usbtmc_id_quirk[n].idVendor == le16_to_cpu(data->usb_dev->descriptor.idVendor)) &&
1395 (usbtmc_id_quirk[n].idProduct == le16_to_cpu(data->usb_dev->descriptor.idProduct))) {
1396 dev_dbg(&intf->dev, "Setting this device as having the RIGOL quirk\n");
1397 data->rigol_quirk = 1;
1398 break;
1399 }
1400 }
1401
1402 /* Initialize USBTMC bTag and other fields */
1403 data->bTag = 1;
1404 data->TermCharEnabled = 0;
1405 data->TermChar = '\n';
1406 /* 2 <= bTag <= 127 USBTMC-USB488 subclass specification 4.3.1 */
1407 data->iin_bTag = 2;
1408
1409 /* USBTMC devices have only one setting, so use that */
1410 iface_desc = data->intf->cur_altsetting;
1411 data->ifnum = iface_desc->desc.bInterfaceNumber;
1412
1413 /* Find bulk endpoints */
1414 retcode = usb_find_common_endpoints(iface_desc,
1415 &bulk_in, &bulk_out, NULL, NULL);
1416 if (retcode) {
1417 dev_err(&intf->dev, "bulk endpoints not found\n");
1418 goto err_put;
1419 }
1420
1421 data->bulk_in = bulk_in->bEndpointAddress;
1422 dev_dbg(&intf->dev, "Found bulk in endpoint at %u\n", data->bulk_in);
1423
1424 data->bulk_out = bulk_out->bEndpointAddress;
1425 dev_dbg(&intf->dev, "Found Bulk out endpoint at %u\n", data->bulk_out);
1426
1427 /* Find int endpoint */
1428 retcode = usb_find_int_in_endpoint(iface_desc, &int_in);
1429 if (!retcode) {
1430 data->iin_ep_present = 1;
1431 data->iin_ep = int_in->bEndpointAddress;
1432 data->iin_wMaxPacketSize = usb_endpoint_maxp(int_in);
1433 data->iin_interval = int_in->bInterval;
1434 dev_dbg(&intf->dev, "Found Int in endpoint at %u\n",
1435 data->iin_ep);
1436 }
1437
1438 retcode = get_capabilities(data);
1439 if (retcode)
1440 dev_err(&intf->dev, "can't read capabilities\n");
1441 else
1442 retcode = sysfs_create_group(&intf->dev.kobj,
1443 &capability_attr_grp);
1444
1445 if (data->iin_ep_present) {
1446 /* allocate int urb */
1447 data->iin_urb = usb_alloc_urb(0, GFP_KERNEL);
1448 if (!data->iin_urb) {
1449 retcode = -ENOMEM;
1450 goto error_register;
1451 }
1452
1453 /* Protect interrupt in endpoint data until iin_urb is freed */
1454 kref_get(&data->kref);
1455
1456 /* allocate buffer for interrupt in */
1457 data->iin_buffer = kmalloc(data->iin_wMaxPacketSize,
1458 GFP_KERNEL);
1459 if (!data->iin_buffer) {
1460 retcode = -ENOMEM;
1461 goto error_register;
1462 }
1463
1464 /* fill interrupt urb */
1465 usb_fill_int_urb(data->iin_urb, data->usb_dev,
1466 usb_rcvintpipe(data->usb_dev, data->iin_ep),
1467 data->iin_buffer, data->iin_wMaxPacketSize,
1468 usbtmc_interrupt,
1469 data, data->iin_interval);
1470
1471 retcode = usb_submit_urb(data->iin_urb, GFP_KERNEL);
1472 if (retcode) {
1473 dev_err(&intf->dev, "Failed to submit iin_urb\n");
1474 goto error_register;
1475 }
1476 }
1477
1478 retcode = sysfs_create_group(&intf->dev.kobj, &data_attr_grp);
1479
1480 retcode = usb_register_dev(intf, &usbtmc_class);
1481 if (retcode) {
1482 dev_err(&intf->dev, "Not able to get a minor"
1483 " (base %u, slice default): %d\n", USBTMC_MINOR_BASE,
1484 retcode);
1485 goto error_register;
1486 }
1487 dev_dbg(&intf->dev, "Using minor number %d\n", intf->minor);
1488
1489 return 0;
1490
1491error_register:
1492 sysfs_remove_group(&intf->dev.kobj, &capability_attr_grp);
1493 sysfs_remove_group(&intf->dev.kobj, &data_attr_grp);
1494 usbtmc_free_int(data);
1495err_put:
1496 kref_put(&data->kref, usbtmc_delete);
1497 return retcode;
1498}
1499
1500static void usbtmc_disconnect(struct usb_interface *intf)
1501{
1502 struct usbtmc_device_data *data;
1503
1504 dev_dbg(&intf->dev, "usbtmc_disconnect called\n");
1505
1506 data = usb_get_intfdata(intf);
1507 usb_deregister_dev(intf, &usbtmc_class);
1508 sysfs_remove_group(&intf->dev.kobj, &capability_attr_grp);
1509 sysfs_remove_group(&intf->dev.kobj, &data_attr_grp);
1510 mutex_lock(&data->io_mutex);
1511 data->zombie = 1;
1512 wake_up_all(&data->waitq);
1513 mutex_unlock(&data->io_mutex);
1514 usbtmc_free_int(data);
1515 kref_put(&data->kref, usbtmc_delete);
1516}
1517
1518static int usbtmc_suspend(struct usb_interface *intf, pm_message_t message)
1519{
1520 /* this driver does not have pending URBs */
1521 return 0;
1522}
1523
1524static int usbtmc_resume(struct usb_interface *intf)
1525{
1526 return 0;
1527}
1528
1529static struct usb_driver usbtmc_driver = {
1530 .name = "usbtmc",
1531 .id_table = usbtmc_devices,
1532 .probe = usbtmc_probe,
1533 .disconnect = usbtmc_disconnect,
1534 .suspend = usbtmc_suspend,
1535 .resume = usbtmc_resume,
1536};
1537
1538module_usb_driver(usbtmc_driver);
1539
1540MODULE_LICENSE("GPL");