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