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x86, mrst: use a temporary variable for SFI irq
[linux-btrfs-devel.git] / drivers / usb / class / usbtmc.c
blob3f94ac34dce31b80440689ae7f0d319a7d2f908c
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
52 static 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 };
57 MODULE_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 */
65 struct 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 */
75 struct 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 */
101 static struct usb_driver usbtmc_driver;
102
103 static 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
111 static 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
131 exit:
132 return retval;
133 }
134
135 static 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
143 static 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 = le16_to_cpu(current_setting->endpoint[n].
190 desc.wMaxPacketSize);
191
192 if (max_size == 0) {
193 dev_err(dev, "Couldn't get wMaxPacketSize\n");
194 rv = -EPERM;
195 goto exit;
196 }
197
198 dev_dbg(&data->intf->dev, "wMaxPacketSize is %d\n", max_size);
199
200 n = 0;
201
202 do {
203 dev_dbg(dev, "Reading from bulk in EP\n");
204
205 rv = usb_bulk_msg(data->usb_dev,
206 usb_rcvbulkpipe(data->usb_dev,
207 data->bulk_in),
208 buffer, USBTMC_SIZE_IOBUFFER,
209 &actual, USBTMC_TIMEOUT);
210
211 n++;
212
213 if (rv < 0) {
214 dev_err(dev, "usb_bulk_msg returned %d\n", rv);
215 goto exit;
216 }
217 } while ((actual == max_size) &&
218 (n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN));
219
220 if (actual == max_size) {
221 dev_err(dev, "Couldn't clear device buffer within %d cycles\n",
222 USBTMC_MAX_READS_TO_CLEAR_BULK_IN);
223 rv = -EPERM;
224 goto exit;
225 }
226
227 n = 0;
228
229 usbtmc_abort_bulk_in_status:
230 rv = usb_control_msg(data->usb_dev,
231 usb_rcvctrlpipe(data->usb_dev, 0),
232 USBTMC_REQUEST_CHECK_ABORT_BULK_IN_STATUS,
233 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT,
234 0, data->bulk_in, buffer, 0x08,
235 USBTMC_TIMEOUT);
236
237 if (rv < 0) {
238 dev_err(dev, "usb_control_msg returned %d\n", rv);
239 goto exit;
240 }
241
242 dev_dbg(dev, "INITIATE_ABORT_BULK_IN returned %x\n", buffer[0]);
243
244 if (buffer[0] == USBTMC_STATUS_SUCCESS) {
245 rv = 0;
246 goto exit;
247 }
248
249 if (buffer[0] != USBTMC_STATUS_PENDING) {
250 dev_err(dev, "INITIATE_ABORT_BULK_IN returned %x\n", buffer[0]);
251 rv = -EPERM;
252 goto exit;
253 }
254
255 if (buffer[1] == 1)
256 do {
257 dev_dbg(dev, "Reading from bulk in EP\n");
258
259 rv = usb_bulk_msg(data->usb_dev,
260 usb_rcvbulkpipe(data->usb_dev,
261 data->bulk_in),
262 buffer, USBTMC_SIZE_IOBUFFER,
263 &actual, USBTMC_TIMEOUT);
264
265 n++;
266
267 if (rv < 0) {
268 dev_err(dev, "usb_bulk_msg returned %d\n", rv);
269 goto exit;
270 }
271 } while ((actual == max_size) &&
272 (n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN));
273
274 if (actual == max_size) {
275 dev_err(dev, "Couldn't clear device buffer within %d cycles\n",
276 USBTMC_MAX_READS_TO_CLEAR_BULK_IN);
277 rv = -EPERM;
278 goto exit;
279 }
280
281 goto usbtmc_abort_bulk_in_status;
282
283 exit:
284 kfree(buffer);
285 return rv;
286
287 }
288
289 static int usbtmc_ioctl_abort_bulk_out(struct usbtmc_device_data *data)
290 {
291 struct device *dev;
292 u8 *buffer;
293 int rv;
294 int n;
295
296 dev = &data->intf->dev;
297
298 buffer = kmalloc(8, GFP_KERNEL);
299 if (!buffer)
300 return -ENOMEM;
301
302 rv = usb_control_msg(data->usb_dev,
303 usb_rcvctrlpipe(data->usb_dev, 0),
304 USBTMC_REQUEST_INITIATE_ABORT_BULK_OUT,
305 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT,
306 data->bTag_last_write, data->bulk_out,
307 buffer, 2, USBTMC_TIMEOUT);
308
309 if (rv < 0) {
310 dev_err(dev, "usb_control_msg returned %d\n", rv);
311 goto exit;
312 }
313
314 dev_dbg(dev, "INITIATE_ABORT_BULK_OUT returned %x\n", buffer[0]);
315
316 if (buffer[0] != USBTMC_STATUS_SUCCESS) {
317 dev_err(dev, "INITIATE_ABORT_BULK_OUT returned %x\n",
318 buffer[0]);
319 rv = -EPERM;
320 goto exit;
321 }
322
323 n = 0;
324
325 usbtmc_abort_bulk_out_check_status:
326 rv = usb_control_msg(data->usb_dev,
327 usb_rcvctrlpipe(data->usb_dev, 0),
328 USBTMC_REQUEST_CHECK_ABORT_BULK_OUT_STATUS,
329 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT,
330 0, data->bulk_out, buffer, 0x08,
331 USBTMC_TIMEOUT);
332 n++;
333 if (rv < 0) {
334 dev_err(dev, "usb_control_msg returned %d\n", rv);
335 goto exit;
336 }
337
338 dev_dbg(dev, "CHECK_ABORT_BULK_OUT returned %x\n", buffer[0]);
339
340 if (buffer[0] == USBTMC_STATUS_SUCCESS)
341 goto usbtmc_abort_bulk_out_clear_halt;
342
343 if ((buffer[0] == USBTMC_STATUS_PENDING) &&
344 (n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN))
345 goto usbtmc_abort_bulk_out_check_status;
346
347 rv = -EPERM;
348 goto exit;
349
350 usbtmc_abort_bulk_out_clear_halt:
351 rv = usb_clear_halt(data->usb_dev,
352 usb_sndbulkpipe(data->usb_dev, data->bulk_out));
353
354 if (rv < 0) {
355 dev_err(dev, "usb_control_msg returned %d\n", rv);
356 goto exit;
357 }
358 rv = 0;
359
360 exit:
361 kfree(buffer);
362 return rv;
363 }
364
365 static ssize_t usbtmc_read(struct file *filp, char __user *buf,
366 size_t count, loff_t *f_pos)
367 {
368 struct usbtmc_device_data *data;
369 struct device *dev;
370 u32 n_characters;
371 u8 *buffer;
372 int actual;
373 size_t done;
374 size_t remaining;
375 int retval;
376 size_t this_part;
377
378 /* Get pointer to private data structure */
379 data = filp->private_data;
380 dev = &data->intf->dev;
381
382 buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL);
383 if (!buffer)
384 return -ENOMEM;
385
386 mutex_lock(&data->io_mutex);
387 if (data->zombie) {
388 retval = -ENODEV;
389 goto exit;
390 }
391
392 remaining = count;
393 done = 0;
394
395 while (remaining > 0) {
396 if (remaining > USBTMC_SIZE_IOBUFFER - 12 - 3)
397 this_part = USBTMC_SIZE_IOBUFFER - 12 - 3;
398 else
399 this_part = remaining;
400
401 /* Setup IO buffer for DEV_DEP_MSG_IN message
402 * Refer to class specs for details
403 */
404 buffer[0] = 2;
405 buffer[1] = data->bTag;
406 buffer[2] = ~(data->bTag);
407 buffer[3] = 0; /* Reserved */
408 buffer[4] = (this_part) & 255;
409 buffer[5] = ((this_part) >> 8) & 255;
410 buffer[6] = ((this_part) >> 16) & 255;
411 buffer[7] = ((this_part) >> 24) & 255;
412 buffer[8] = data->TermCharEnabled * 2;
413 /* Use term character? */
414 buffer[9] = data->TermChar;
415 buffer[10] = 0; /* Reserved */
416 buffer[11] = 0; /* Reserved */
417
418 /* Send bulk URB */
419 retval = usb_bulk_msg(data->usb_dev,
420 usb_sndbulkpipe(data->usb_dev,
421 data->bulk_out),
422 buffer, 12, &actual, USBTMC_TIMEOUT);
423
424 /* Store bTag (in case we need to abort) */
425 data->bTag_last_write = data->bTag;
426
427 /* Increment bTag -- and increment again if zero */
428 data->bTag++;
429 if (!data->bTag)
430 (data->bTag)++;
431
432 if (retval < 0) {
433 dev_err(dev, "usb_bulk_msg returned %d\n", retval);
434 if (data->auto_abort)
435 usbtmc_ioctl_abort_bulk_out(data);
436 goto exit;
437 }
438
439 /* Send bulk URB */
440 retval = usb_bulk_msg(data->usb_dev,
441 usb_rcvbulkpipe(data->usb_dev,
442 data->bulk_in),
443 buffer, USBTMC_SIZE_IOBUFFER, &actual,
444 USBTMC_TIMEOUT);
445
446 /* Store bTag (in case we need to abort) */
447 data->bTag_last_read = data->bTag;
448
449 if (retval < 0) {
450 dev_err(dev, "Unable to read data, error %d\n", retval);
451 if (data->auto_abort)
452 usbtmc_ioctl_abort_bulk_in(data);
453 goto exit;
454 }
455
456 /* How many characters did the instrument send? */
457 n_characters = buffer[4] +
458 (buffer[5] << 8) +
459 (buffer[6] << 16) +
460 (buffer[7] << 24);
461
462 /* Ensure the instrument doesn't lie about it */
463 if(n_characters > actual - 12) {
464 dev_err(dev, "Device lies about message size: %u > %d\n", n_characters, actual - 12);
465 n_characters = actual - 12;
466 }
467
468 /* Ensure the instrument doesn't send more back than requested */
469 if(n_characters > this_part) {
470 dev_err(dev, "Device returns more than requested: %zu > %zu\n", done + n_characters, done + this_part);
471 n_characters = this_part;
472 }
473
474 /* Bound amount of data received by amount of data requested */
475 if (n_characters > this_part)
476 n_characters = this_part;
477
478 /* Copy buffer to user space */
479 if (copy_to_user(buf + done, &buffer[12], n_characters)) {
480 /* There must have been an addressing problem */
481 retval = -EFAULT;
482 goto exit;
483 }
484
485 done += n_characters;
486 /* Terminate if end-of-message bit received from device */
487 if ((buffer[8] & 0x01) && (actual >= n_characters + 12))
488 remaining = 0;
489 else
490 remaining -= n_characters;
491 }
492
493 /* Update file position value */
494 *f_pos = *f_pos + done;
495 retval = done;
496
497 exit:
498 mutex_unlock(&data->io_mutex);
499 kfree(buffer);
500 return retval;
501 }
502
503 static ssize_t usbtmc_write(struct file *filp, const char __user *buf,
504 size_t count, loff_t *f_pos)
505 {
506 struct usbtmc_device_data *data;
507 u8 *buffer;
508 int retval;
509 int actual;
510 unsigned long int n_bytes;
511 int remaining;
512 int done;
513 int this_part;
514
515 data = filp->private_data;
516
517 buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL);
518 if (!buffer)
519 return -ENOMEM;
520
521 mutex_lock(&data->io_mutex);
522 if (data->zombie) {
523 retval = -ENODEV;
524 goto exit;
525 }
526
527 remaining = count;
528 done = 0;
529
530 while (remaining > 0) {
531 if (remaining > USBTMC_SIZE_IOBUFFER - 12) {
532 this_part = USBTMC_SIZE_IOBUFFER - 12;
533 buffer[8] = 0;
534 } else {
535 this_part = remaining;
536 buffer[8] = 1;
537 }
538
539 /* Setup IO buffer for DEV_DEP_MSG_OUT message */
540 buffer[0] = 1;
541 buffer[1] = data->bTag;
542 buffer[2] = ~(data->bTag);
543 buffer[3] = 0; /* Reserved */
544 buffer[4] = this_part & 255;
545 buffer[5] = (this_part >> 8) & 255;
546 buffer[6] = (this_part >> 16) & 255;
547 buffer[7] = (this_part >> 24) & 255;
548 /* buffer[8] is set above... */
549 buffer[9] = 0; /* Reserved */
550 buffer[10] = 0; /* Reserved */
551 buffer[11] = 0; /* Reserved */
552
553 if (copy_from_user(&buffer[12], buf + done, this_part)) {
554 retval = -EFAULT;
555 goto exit;
556 }
557
558 n_bytes = roundup(12 + this_part, 4);
559 memset(buffer + 12 + this_part, 0, n_bytes - (12 + this_part));
560
561 do {
562 retval = usb_bulk_msg(data->usb_dev,
563 usb_sndbulkpipe(data->usb_dev,
564 data->bulk_out),
565 buffer, n_bytes,
566 &actual, USBTMC_TIMEOUT);
567 if (retval != 0)
568 break;
569 n_bytes -= actual;
570 } while (n_bytes);
571
572 data->bTag_last_write = data->bTag;
573 data->bTag++;
574
575 if (!data->bTag)
576 data->bTag++;
577
578 if (retval < 0) {
579 dev_err(&data->intf->dev,
580 "Unable to send data, error %d\n", retval);
581 if (data->auto_abort)
582 usbtmc_ioctl_abort_bulk_out(data);
583 goto exit;
584 }
585
586 remaining -= this_part;
587 done += this_part;
588 }
589
590 retval = count;
591 exit:
592 mutex_unlock(&data->io_mutex);
593 kfree(buffer);
594 return retval;
595 }
596
597 static int usbtmc_ioctl_clear(struct usbtmc_device_data *data)
598 {
599 struct usb_host_interface *current_setting;
600 struct usb_endpoint_descriptor *desc;
601 struct device *dev;
602 u8 *buffer;
603 int rv;
604 int n;
605 int actual;
606 int max_size;
607
608 dev = &data->intf->dev;
609
610 dev_dbg(dev, "Sending INITIATE_CLEAR request\n");
611
612 buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL);
613 if (!buffer)
614 return -ENOMEM;
615
616 rv = usb_control_msg(data->usb_dev,
617 usb_rcvctrlpipe(data->usb_dev, 0),
618 USBTMC_REQUEST_INITIATE_CLEAR,
619 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
620 0, 0, buffer, 1, USBTMC_TIMEOUT);
621 if (rv < 0) {
622 dev_err(dev, "usb_control_msg returned %d\n", rv);
623 goto exit;
624 }
625
626 dev_dbg(dev, "INITIATE_CLEAR returned %x\n", buffer[0]);
627
628 if (buffer[0] != USBTMC_STATUS_SUCCESS) {
629 dev_err(dev, "INITIATE_CLEAR returned %x\n", buffer[0]);
630 rv = -EPERM;
631 goto exit;
632 }
633
634 max_size = 0;
635 current_setting = data->intf->cur_altsetting;
636 for (n = 0; n < current_setting->desc.bNumEndpoints; n++) {
637 desc = &current_setting->endpoint[n].desc;
638 if (desc->bEndpointAddress == data->bulk_in)
639 max_size = le16_to_cpu(desc->wMaxPacketSize);
640 }
641
642 if (max_size == 0) {
643 dev_err(dev, "Couldn't get wMaxPacketSize\n");
644 rv = -EPERM;
645 goto exit;
646 }
647
648 dev_dbg(dev, "wMaxPacketSize is %d\n", max_size);
649
650 n = 0;
651
652 usbtmc_clear_check_status:
653
654 dev_dbg(dev, "Sending CHECK_CLEAR_STATUS request\n");
655
656 rv = usb_control_msg(data->usb_dev,
657 usb_rcvctrlpipe(data->usb_dev, 0),
658 USBTMC_REQUEST_CHECK_CLEAR_STATUS,
659 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
660 0, 0, buffer, 2, USBTMC_TIMEOUT);
661 if (rv < 0) {
662 dev_err(dev, "usb_control_msg returned %d\n", rv);
663 goto exit;
664 }
665
666 dev_dbg(dev, "CHECK_CLEAR_STATUS returned %x\n", buffer[0]);
667
668 if (buffer[0] == USBTMC_STATUS_SUCCESS)
669 goto usbtmc_clear_bulk_out_halt;
670
671 if (buffer[0] != USBTMC_STATUS_PENDING) {
672 dev_err(dev, "CHECK_CLEAR_STATUS returned %x\n", buffer[0]);
673 rv = -EPERM;
674 goto exit;
675 }
676
677 if (buffer[1] == 1)
678 do {
679 dev_dbg(dev, "Reading from bulk in EP\n");
680
681 rv = usb_bulk_msg(data->usb_dev,
682 usb_rcvbulkpipe(data->usb_dev,
683 data->bulk_in),
684 buffer, USBTMC_SIZE_IOBUFFER,
685 &actual, USBTMC_TIMEOUT);
686 n++;
687
688 if (rv < 0) {
689 dev_err(dev, "usb_control_msg returned %d\n",
690 rv);
691 goto exit;
692 }
693 } while ((actual == max_size) &&
694 (n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN));
695
696 if (actual == max_size) {
697 dev_err(dev, "Couldn't clear device buffer within %d cycles\n",
698 USBTMC_MAX_READS_TO_CLEAR_BULK_IN);
699 rv = -EPERM;
700 goto exit;
701 }
702
703 goto usbtmc_clear_check_status;
704
705 usbtmc_clear_bulk_out_halt:
706
707 rv = usb_clear_halt(data->usb_dev,
708 usb_sndbulkpipe(data->usb_dev, data->bulk_out));
709 if (rv < 0) {
710 dev_err(dev, "usb_control_msg returned %d\n", rv);
711 goto exit;
712 }
713 rv = 0;
714
715 exit:
716 kfree(buffer);
717 return rv;
718 }
719
720 static int usbtmc_ioctl_clear_out_halt(struct usbtmc_device_data *data)
721 {
722 u8 *buffer;
723 int rv;
724
725 buffer = kmalloc(2, GFP_KERNEL);
726 if (!buffer)
727 return -ENOMEM;
728
729 rv = usb_clear_halt(data->usb_dev,
730 usb_sndbulkpipe(data->usb_dev, data->bulk_out));
731
732 if (rv < 0) {
733 dev_err(&data->usb_dev->dev, "usb_control_msg returned %d\n",
734 rv);
735 goto exit;
736 }
737 rv = 0;
738
739 exit:
740 kfree(buffer);
741 return rv;
742 }
743
744 static int usbtmc_ioctl_clear_in_halt(struct usbtmc_device_data *data)
745 {
746 u8 *buffer;
747 int rv;
748
749 buffer = kmalloc(2, GFP_KERNEL);
750 if (!buffer)
751 return -ENOMEM;
752
753 rv = usb_clear_halt(data->usb_dev,
754 usb_rcvbulkpipe(data->usb_dev, data->bulk_in));
755
756 if (rv < 0) {
757 dev_err(&data->usb_dev->dev, "usb_control_msg returned %d\n",
758 rv);
759 goto exit;
760 }
761 rv = 0;
762
763 exit:
764 kfree(buffer);
765 return rv;
766 }
767
768 static int get_capabilities(struct usbtmc_device_data *data)
769 {
770 struct device *dev = &data->usb_dev->dev;
771 char *buffer;
772 int rv = 0;
773
774 buffer = kmalloc(0x18, GFP_KERNEL);
775 if (!buffer)
776 return -ENOMEM;
777
778 rv = usb_control_msg(data->usb_dev, usb_rcvctrlpipe(data->usb_dev, 0),
779 USBTMC_REQUEST_GET_CAPABILITIES,
780 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
781 0, 0, buffer, 0x18, USBTMC_TIMEOUT);
782 if (rv < 0) {
783 dev_err(dev, "usb_control_msg returned %d\n", rv);
784 goto err_out;
785 }
786
787 dev_dbg(dev, "GET_CAPABILITIES returned %x\n", buffer[0]);
788 if (buffer[0] != USBTMC_STATUS_SUCCESS) {
789 dev_err(dev, "GET_CAPABILITIES returned %x\n", buffer[0]);
790 rv = -EPERM;
791 goto err_out;
792 }
793 dev_dbg(dev, "Interface capabilities are %x\n", buffer[4]);
794 dev_dbg(dev, "Device capabilities are %x\n", buffer[5]);
795 dev_dbg(dev, "USB488 interface capabilities are %x\n", buffer[14]);
796 dev_dbg(dev, "USB488 device capabilities are %x\n", buffer[15]);
797
798 data->capabilities.interface_capabilities = buffer[4];
799 data->capabilities.device_capabilities = buffer[5];
800 data->capabilities.usb488_interface_capabilities = buffer[14];
801 data->capabilities.usb488_device_capabilities = buffer[15];
802 rv = 0;
803
804 err_out:
805 kfree(buffer);
806 return rv;
807 }
808
809 #define capability_attribute(name) \
810 static ssize_t show_##name(struct device *dev, \
811 struct device_attribute *attr, char *buf) \
812 { \
813 struct usb_interface *intf = to_usb_interface(dev); \
814 struct usbtmc_device_data *data = usb_get_intfdata(intf); \
815 \
816 return sprintf(buf, "%d\n", data->capabilities.name); \
817 } \
818 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)
819
820 capability_attribute(interface_capabilities);
821 capability_attribute(device_capabilities);
822 capability_attribute(usb488_interface_capabilities);
823 capability_attribute(usb488_device_capabilities);
824
825 static struct attribute *capability_attrs[] = {
826 &dev_attr_interface_capabilities.attr,
827 &dev_attr_device_capabilities.attr,
828 &dev_attr_usb488_interface_capabilities.attr,
829 &dev_attr_usb488_device_capabilities.attr,
830 NULL,
831 };
832
833 static struct attribute_group capability_attr_grp = {
834 .attrs = capability_attrs,
835 };
836
837 static ssize_t show_TermChar(struct device *dev,
838 struct device_attribute *attr, char *buf)
839 {
840 struct usb_interface *intf = to_usb_interface(dev);
841 struct usbtmc_device_data *data = usb_get_intfdata(intf);
842
843 return sprintf(buf, "%c\n", data->TermChar);
844 }
845
846 static ssize_t store_TermChar(struct device *dev,
847 struct device_attribute *attr,
848 const char *buf, size_t count)
849 {
850 struct usb_interface *intf = to_usb_interface(dev);
851 struct usbtmc_device_data *data = usb_get_intfdata(intf);
852
853 if (count < 1)
854 return -EINVAL;
855 data->TermChar = buf[0];
856 return count;
857 }
858 static DEVICE_ATTR(TermChar, S_IRUGO, show_TermChar, store_TermChar);
859
860 #define data_attribute(name) \
861 static ssize_t show_##name(struct device *dev, \
862 struct device_attribute *attr, char *buf) \
863 { \
864 struct usb_interface *intf = to_usb_interface(dev); \
865 struct usbtmc_device_data *data = usb_get_intfdata(intf); \
866 \
867 return sprintf(buf, "%d\n", data->name); \
868 } \
869 static ssize_t store_##name(struct device *dev, \
870 struct device_attribute *attr, \
871 const char *buf, size_t count) \
872 { \
873 struct usb_interface *intf = to_usb_interface(dev); \
874 struct usbtmc_device_data *data = usb_get_intfdata(intf); \
875 ssize_t result; \
876 unsigned val; \
877 \
878 result = sscanf(buf, "%u\n", &val); \
879 if (result != 1) \
880 result = -EINVAL; \
881 data->name = val; \
882 if (result < 0) \
883 return result; \
884 else \
885 return count; \
886 } \
887 static DEVICE_ATTR(name, S_IRUGO, show_##name, store_##name)
888
889 data_attribute(TermCharEnabled);
890 data_attribute(auto_abort);
891
892 static struct attribute *data_attrs[] = {
893 &dev_attr_TermChar.attr,
894 &dev_attr_TermCharEnabled.attr,
895 &dev_attr_auto_abort.attr,
896 NULL,
897 };
898
899 static struct attribute_group data_attr_grp = {
900 .attrs = data_attrs,
901 };
902
903 static int usbtmc_ioctl_indicator_pulse(struct usbtmc_device_data *data)
904 {
905 struct device *dev;
906 u8 *buffer;
907 int rv;
908
909 dev = &data->intf->dev;
910
911 buffer = kmalloc(2, GFP_KERNEL);
912 if (!buffer)
913 return -ENOMEM;
914
915 rv = usb_control_msg(data->usb_dev,
916 usb_rcvctrlpipe(data->usb_dev, 0),
917 USBTMC_REQUEST_INDICATOR_PULSE,
918 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
919 0, 0, buffer, 0x01, USBTMC_TIMEOUT);
920
921 if (rv < 0) {
922 dev_err(dev, "usb_control_msg returned %d\n", rv);
923 goto exit;
924 }
925
926 dev_dbg(dev, "INDICATOR_PULSE returned %x\n", buffer[0]);
927
928 if (buffer[0] != USBTMC_STATUS_SUCCESS) {
929 dev_err(dev, "INDICATOR_PULSE returned %x\n", buffer[0]);
930 rv = -EPERM;
931 goto exit;
932 }
933 rv = 0;
934
935 exit:
936 kfree(buffer);
937 return rv;
938 }
939
940 static long usbtmc_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
941 {
942 struct usbtmc_device_data *data;
943 int retval = -EBADRQC;
944
945 data = file->private_data;
946 mutex_lock(&data->io_mutex);
947 if (data->zombie) {
948 retval = -ENODEV;
949 goto skip_io_on_zombie;
950 }
951
952 switch (cmd) {
953 case USBTMC_IOCTL_CLEAR_OUT_HALT:
954 retval = usbtmc_ioctl_clear_out_halt(data);
955 break;
956
957 case USBTMC_IOCTL_CLEAR_IN_HALT:
958 retval = usbtmc_ioctl_clear_in_halt(data);
959 break;
960
961 case USBTMC_IOCTL_INDICATOR_PULSE:
962 retval = usbtmc_ioctl_indicator_pulse(data);
963 break;
964
965 case USBTMC_IOCTL_CLEAR:
966 retval = usbtmc_ioctl_clear(data);
967 break;
968
969 case USBTMC_IOCTL_ABORT_BULK_OUT:
970 retval = usbtmc_ioctl_abort_bulk_out(data);
971 break;
972
973 case USBTMC_IOCTL_ABORT_BULK_IN:
974 retval = usbtmc_ioctl_abort_bulk_in(data);
975 break;
976 }
977
978 skip_io_on_zombie:
979 mutex_unlock(&data->io_mutex);
980 return retval;
981 }
982
983 static const struct file_operations fops = {
984 .owner = THIS_MODULE,
985 .read = usbtmc_read,
986 .write = usbtmc_write,
987 .open = usbtmc_open,
988 .release = usbtmc_release,
989 .unlocked_ioctl = usbtmc_ioctl,
990 .llseek = default_llseek,
991 };
992
993 static struct usb_class_driver usbtmc_class = {
994 .name = "usbtmc%d",
995 .fops = &fops,
996 .minor_base = USBTMC_MINOR_BASE,
997 };
998
999
1000 static int usbtmc_probe(struct usb_interface *intf,
1001 const struct usb_device_id *id)
1002 {
1003 struct usbtmc_device_data *data;
1004 struct usb_host_interface *iface_desc;
1005 struct usb_endpoint_descriptor *endpoint;
1006 int n;
1007 int retcode;
1008
1009 dev_dbg(&intf->dev, "%s called\n", __func__);
1010
1011 data = kmalloc(sizeof(struct usbtmc_device_data), GFP_KERNEL);
1012 if (!data) {
1013 dev_err(&intf->dev, "Unable to allocate kernel memory\n");
1014 return -ENOMEM;
1015 }
1016
1017 data->intf = intf;
1018 data->id = id;
1019 data->usb_dev = usb_get_dev(interface_to_usbdev(intf));
1020 usb_set_intfdata(intf, data);
1021 kref_init(&data->kref);
1022 mutex_init(&data->io_mutex);
1023 data->zombie = 0;
1024
1025 /* Initialize USBTMC bTag and other fields */
1026 data->bTag = 1;
1027 data->TermCharEnabled = 0;
1028 data->TermChar = '\n';
1029
1030 /* USBTMC devices have only one setting, so use that */
1031 iface_desc = data->intf->cur_altsetting;
1032
1033 /* Find bulk in endpoint */
1034 for (n = 0; n < iface_desc->desc.bNumEndpoints; n++) {
1035 endpoint = &iface_desc->endpoint[n].desc;
1036
1037 if (usb_endpoint_is_bulk_in(endpoint)) {
1038 data->bulk_in = endpoint->bEndpointAddress;
1039 dev_dbg(&intf->dev, "Found bulk in endpoint at %u\n",
1040 data->bulk_in);
1041 break;
1042 }
1043 }
1044
1045 /* Find bulk out endpoint */
1046 for (n = 0; n < iface_desc->desc.bNumEndpoints; n++) {
1047 endpoint = &iface_desc->endpoint[n].desc;
1048
1049 if (usb_endpoint_is_bulk_out(endpoint)) {
1050 data->bulk_out = endpoint->bEndpointAddress;
1051 dev_dbg(&intf->dev, "Found Bulk out endpoint at %u\n",
1052 data->bulk_out);
1053 break;
1054 }
1055 }
1056
1057 retcode = get_capabilities(data);
1058 if (retcode)
1059 dev_err(&intf->dev, "can't read capabilities\n");
1060 else
1061 retcode = sysfs_create_group(&intf->dev.kobj,
1062 &capability_attr_grp);
1063
1064 retcode = sysfs_create_group(&intf->dev.kobj, &data_attr_grp);
1065
1066 retcode = usb_register_dev(intf, &usbtmc_class);
1067 if (retcode) {
1068 dev_err(&intf->dev, "Not able to get a minor"
1069 " (base %u, slice default): %d\n", USBTMC_MINOR_BASE,
1070 retcode);
1071 goto error_register;
1072 }
1073 dev_dbg(&intf->dev, "Using minor number %d\n", intf->minor);
1074
1075 return 0;
1076
1077 error_register:
1078 sysfs_remove_group(&intf->dev.kobj, &capability_attr_grp);
1079 sysfs_remove_group(&intf->dev.kobj, &data_attr_grp);
1080 kref_put(&data->kref, usbtmc_delete);
1081 return retcode;
1082 }
1083
1084 static void usbtmc_disconnect(struct usb_interface *intf)
1085 {
1086 struct usbtmc_device_data *data;
1087
1088 dev_dbg(&intf->dev, "usbtmc_disconnect called\n");
1089
1090 data = usb_get_intfdata(intf);
1091 usb_deregister_dev(intf, &usbtmc_class);
1092 sysfs_remove_group(&intf->dev.kobj, &capability_attr_grp);
1093 sysfs_remove_group(&intf->dev.kobj, &data_attr_grp);
1094 mutex_lock(&data->io_mutex);
1095 data->zombie = 1;
1096 mutex_unlock(&data->io_mutex);
1097 kref_put(&data->kref, usbtmc_delete);
1098 }
1099
1100 static int usbtmc_suspend(struct usb_interface *intf, pm_message_t message)
1101 {
1102 /* this driver does not have pending URBs */
1103 return 0;
1104 }
1105
1106 static int usbtmc_resume(struct usb_interface *intf)
1107 {
1108 return 0;
1109 }
1110
1111 static struct usb_driver usbtmc_driver = {
1112 .name = "usbtmc",
1113 .id_table = usbtmc_devices,
1114 .probe = usbtmc_probe,
1115 .disconnect = usbtmc_disconnect,
1116 .suspend = usbtmc_suspend,
1117 .resume = usbtmc_resume,
1118 };
1119
1120 static int __init usbtmc_init(void)
1121 {
1122 int retcode;
1123
1124 retcode = usb_register(&usbtmc_driver);
1125 if (retcode)
1126 printk(KERN_ERR KBUILD_MODNAME": Unable to register driver\n");
1127 return retcode;
1128 }
1129 module_init(usbtmc_init);
1130
1131 static void __exit usbtmc_exit(void)
1132 {
1133 usb_deregister(&usbtmc_driver);
1134 }
1135 module_exit(usbtmc_exit);
1136
1137 MODULE_LICENSE("GPL");
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