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USB: usbtmc: indent & braces disagree, something else is desired
[linux-2.6/mini2440.git] / drivers / usb / class / usbtmc.c
blob0f5c05f6f9df0fd022a1eebf5d49d8c2931a6c47
1 /**
2 * drivers/usb/class/usbtmc.c - USB Test & Measurment 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/mutex.h>
29 #include <linux/usb.h>
30 #include <linux/usb/tmc.h>
31
32
33 #define USBTMC_MINOR_BASE 176
34
35 /*
36 * Size of driver internal IO buffer. Must be multiple of 4 and at least as
37 * large as wMaxPacketSize (which is usually 512 bytes).
38 */
39 #define USBTMC_SIZE_IOBUFFER 2048
40
41 /* Default USB timeout (in milliseconds) */
42 #define USBTMC_TIMEOUT 10
43
44 /*
45 * Maximum number of read cycles to empty bulk in endpoint during CLEAR and
46 * ABORT_BULK_IN requests. Ends the loop if (for whatever reason) a short
47 * packet is never read.
48 */
49 #define USBTMC_MAX_READS_TO_CLEAR_BULK_IN 100
50
51 static struct usb_device_id usbtmc_devices[] = {
52 { USB_INTERFACE_INFO(USB_CLASS_APP_SPEC, 3, 0), },
53 { 0, } /* terminating entry */
54 };
55 MODULE_DEVICE_TABLE(usb, usbtmc_devices);
56
57 /*
58 * This structure is the capabilities for the device
59 * See section 4.2.1.8 of the USBTMC specification for details.
60 */
61 struct usbtmc_dev_capabilities {
62 __u8 interface_capabilities;
63 __u8 device_capabilities;
64 __u8 usb488_interface_capabilities;
65 __u8 usb488_device_capabilities;
66 };
67
68 /* This structure holds private data for each USBTMC device. One copy is
69 * allocated for each USBTMC device in the driver's probe function.
70 */
71 struct usbtmc_device_data {
72 const struct usb_device_id *id;
73 struct usb_device *usb_dev;
74 struct usb_interface *intf;
75
76 unsigned int bulk_in;
77 unsigned int bulk_out;
78
79 u8 bTag;
80 u8 bTag_last_write; /* needed for abort */
81 u8 bTag_last_read; /* needed for abort */
82
83 /* attributes from the USB TMC spec for this device */
84 u8 TermChar;
85 bool TermCharEnabled;
86 bool auto_abort;
87
88 struct usbtmc_dev_capabilities capabilities;
89 struct kref kref;
90 struct mutex io_mutex; /* only one i/o function running at a time */
91 };
92 #define to_usbtmc_data(d) container_of(d, struct usbtmc_device_data, kref)
93
94 /* Forward declarations */
95 static struct usb_driver usbtmc_driver;
96
97 static void usbtmc_delete(struct kref *kref)
98 {
99 struct usbtmc_device_data *data = to_usbtmc_data(kref);
100
101 usb_put_dev(data->usb_dev);
102 kfree(data);
103 }
104
105 static int usbtmc_open(struct inode *inode, struct file *filp)
106 {
107 struct usb_interface *intf;
108 struct usbtmc_device_data *data;
109 int retval = -ENODEV;
110
111 intf = usb_find_interface(&usbtmc_driver, iminor(inode));
112 if (!intf) {
113 printk(KERN_ERR KBUILD_MODNAME
114 ": can not find device for minor %d", iminor(inode));
115 goto exit;
116 }
117
118 data = usb_get_intfdata(intf);
119 kref_get(&data->kref);
120
121 /* Store pointer in file structure's private data field */
122 filp->private_data = data;
123
124 exit:
125 return retval;
126 }
127
128 static int usbtmc_release(struct inode *inode, struct file *file)
129 {
130 struct usbtmc_device_data *data = file->private_data;
131
132 kref_put(&data->kref, usbtmc_delete);
133 return 0;
134 }
135
136 static int usbtmc_ioctl_abort_bulk_in(struct usbtmc_device_data *data)
137 {
138 u8 *buffer;
139 struct device *dev;
140 int rv;
141 int n;
142 int actual;
143 struct usb_host_interface *current_setting;
144 int max_size;
145
146 dev = &data->intf->dev;
147 buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL);
148 if (!buffer)
149 return -ENOMEM;
150
151 rv = usb_control_msg(data->usb_dev,
152 usb_rcvctrlpipe(data->usb_dev, 0),
153 USBTMC_REQUEST_INITIATE_ABORT_BULK_IN,
154 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT,
155 data->bTag_last_read, data->bulk_in,
156 buffer, 2, USBTMC_TIMEOUT);
157
158 if (rv < 0) {
159 dev_err(dev, "usb_control_msg returned %d\n", rv);
160 goto exit;
161 }
162
163 dev_dbg(dev, "INITIATE_ABORT_BULK_IN returned %x\n", buffer[0]);
164
165 if (buffer[0] == USBTMC_STATUS_FAILED) {
166 rv = 0;
167 goto exit;
168 }
169
170 if (buffer[0] != USBTMC_STATUS_SUCCESS) {
171 dev_err(dev, "INITIATE_ABORT_BULK_IN returned %x\n",
172 buffer[0]);
173 rv = -EPERM;
174 goto exit;
175 }
176
177 max_size = 0;
178 current_setting = data->intf->cur_altsetting;
179 for (n = 0; n < current_setting->desc.bNumEndpoints; n++)
180 if (current_setting->endpoint[n].desc.bEndpointAddress ==
181 data->bulk_in)
182 max_size = le16_to_cpu(current_setting->endpoint[n].
183 desc.wMaxPacketSize);
184
185 if (max_size == 0) {
186 dev_err(dev, "Couldn't get wMaxPacketSize\n");
187 rv = -EPERM;
188 goto exit;
189 }
190
191 dev_dbg(&data->intf->dev, "wMaxPacketSize is %d\n", max_size);
192
193 n = 0;
194
195 do {
196 dev_dbg(dev, "Reading from bulk in EP\n");
197
198 rv = usb_bulk_msg(data->usb_dev,
199 usb_rcvbulkpipe(data->usb_dev,
200 data->bulk_in),
201 buffer, USBTMC_SIZE_IOBUFFER,
202 &actual, USBTMC_TIMEOUT);
203
204 n++;
205
206 if (rv < 0) {
207 dev_err(dev, "usb_bulk_msg returned %d\n", rv);
208 goto exit;
209 }
210 } while ((actual == max_size) &&
211 (n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN));
212
213 if (actual == max_size) {
214 dev_err(dev, "Couldn't clear device buffer within %d cycles\n",
215 USBTMC_MAX_READS_TO_CLEAR_BULK_IN);
216 rv = -EPERM;
217 goto exit;
218 }
219
220 n = 0;
221
222 usbtmc_abort_bulk_in_status:
223 rv = usb_control_msg(data->usb_dev,
224 usb_rcvctrlpipe(data->usb_dev, 0),
225 USBTMC_REQUEST_CHECK_ABORT_BULK_IN_STATUS,
226 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT,
227 0, data->bulk_in, buffer, 0x08,
228 USBTMC_TIMEOUT);
229
230 if (rv < 0) {
231 dev_err(dev, "usb_control_msg returned %d\n", rv);
232 goto exit;
233 }
234
235 dev_dbg(dev, "INITIATE_ABORT_BULK_IN returned %x\n", buffer[0]);
236
237 if (buffer[0] == USBTMC_STATUS_SUCCESS) {
238 rv = 0;
239 goto exit;
240 }
241
242 if (buffer[0] != USBTMC_STATUS_PENDING) {
243 dev_err(dev, "INITIATE_ABORT_BULK_IN returned %x\n", buffer[0]);
244 rv = -EPERM;
245 goto exit;
246 }
247
248 if (buffer[1] == 1)
249 do {
250 dev_dbg(dev, "Reading from bulk in EP\n");
251
252 rv = usb_bulk_msg(data->usb_dev,
253 usb_rcvbulkpipe(data->usb_dev,
254 data->bulk_in),
255 buffer, USBTMC_SIZE_IOBUFFER,
256 &actual, USBTMC_TIMEOUT);
257
258 n++;
259
260 if (rv < 0) {
261 dev_err(dev, "usb_bulk_msg returned %d\n", rv);
262 goto exit;
263 }
264 } while ((actual = max_size) &&
265 (n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN));
266
267 if (actual == max_size) {
268 dev_err(dev, "Couldn't clear device buffer within %d cycles\n",
269 USBTMC_MAX_READS_TO_CLEAR_BULK_IN);
270 rv = -EPERM;
271 goto exit;
272 }
273
274 goto usbtmc_abort_bulk_in_status;
275
276 exit:
277 kfree(buffer);
278 return rv;
279
280 }
281
282 static int usbtmc_ioctl_abort_bulk_out(struct usbtmc_device_data *data)
283 {
284 struct device *dev;
285 u8 *buffer;
286 int rv;
287 int n;
288
289 dev = &data->intf->dev;
290
291 buffer = kmalloc(8, GFP_KERNEL);
292 if (!buffer)
293 return -ENOMEM;
294
295 rv = usb_control_msg(data->usb_dev,
296 usb_rcvctrlpipe(data->usb_dev, 0),
297 USBTMC_REQUEST_INITIATE_ABORT_BULK_OUT,
298 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT,
299 data->bTag_last_write, data->bulk_out,
300 buffer, 2, USBTMC_TIMEOUT);
301
302 if (rv < 0) {
303 dev_err(dev, "usb_control_msg returned %d\n", rv);
304 goto exit;
305 }
306
307 dev_dbg(dev, "INITIATE_ABORT_BULK_OUT returned %x\n", buffer[0]);
308
309 if (buffer[0] != USBTMC_STATUS_SUCCESS) {
310 dev_err(dev, "INITIATE_ABORT_BULK_OUT returned %x\n",
311 buffer[0]);
312 rv = -EPERM;
313 goto exit;
314 }
315
316 n = 0;
317
318 usbtmc_abort_bulk_out_check_status:
319 rv = usb_control_msg(data->usb_dev,
320 usb_rcvctrlpipe(data->usb_dev, 0),
321 USBTMC_REQUEST_CHECK_ABORT_BULK_OUT_STATUS,
322 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT,
323 0, data->bulk_out, buffer, 0x08,
324 USBTMC_TIMEOUT);
325 n++;
326 if (rv < 0) {
327 dev_err(dev, "usb_control_msg returned %d\n", rv);
328 goto exit;
329 }
330
331 dev_dbg(dev, "CHECK_ABORT_BULK_OUT returned %x\n", buffer[0]);
332
333 if (buffer[0] == USBTMC_STATUS_SUCCESS)
334 goto usbtmc_abort_bulk_out_clear_halt;
335
336 if ((buffer[0] == USBTMC_STATUS_PENDING) &&
337 (n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN))
338 goto usbtmc_abort_bulk_out_check_status;
339
340 rv = -EPERM;
341 goto exit;
342
343 usbtmc_abort_bulk_out_clear_halt:
344 rv = usb_control_msg(data->usb_dev,
345 usb_sndctrlpipe(data->usb_dev, 0),
346 USB_REQ_CLEAR_FEATURE,
347 USB_DIR_OUT | USB_TYPE_STANDARD |
348 USB_RECIP_ENDPOINT,
349 USB_ENDPOINT_HALT, data->bulk_out, buffer,
350 0, USBTMC_TIMEOUT);
351
352 if (rv < 0) {
353 dev_err(dev, "usb_control_msg returned %d\n", rv);
354 goto exit;
355 }
356 rv = 0;
357
358 exit:
359 kfree(buffer);
360 return rv;
361 }
362
363 static ssize_t usbtmc_read(struct file *filp, char __user *buf,
364 size_t count, loff_t *f_pos)
365 {
366 struct usbtmc_device_data *data;
367 struct device *dev;
368 unsigned long int n_characters;
369 u8 *buffer;
370 int actual;
371 int done;
372 int remaining;
373 int retval;
374 int this_part;
375
376 /* Get pointer to private data structure */
377 data = filp->private_data;
378 dev = &data->intf->dev;
379
380 buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL);
381 if (!buffer)
382 return -ENOMEM;
383
384 mutex_lock(&data->io_mutex);
385
386 remaining = count;
387 done = 0;
388
389 while (remaining > 0) {
390 if (remaining > USBTMC_SIZE_IOBUFFER - 12 - 3)
391 this_part = USBTMC_SIZE_IOBUFFER - 12 - 3;
392 else
393 this_part = remaining;
394
395 /* Setup IO buffer for DEV_DEP_MSG_IN message
396 * Refer to class specs for details
397 */
398 buffer[0] = 2;
399 buffer[1] = data->bTag;
400 buffer[2] = ~(data->bTag);
401 buffer[3] = 0; /* Reserved */
402 buffer[4] = (this_part - 12 - 3) & 255;
403 buffer[5] = ((this_part - 12 - 3) >> 8) & 255;
404 buffer[6] = ((this_part - 12 - 3) >> 16) & 255;
405 buffer[7] = ((this_part - 12 - 3) >> 24) & 255;
406 buffer[8] = data->TermCharEnabled * 2;
407 /* Use term character? */
408 buffer[9] = data->TermChar;
409 buffer[10] = 0; /* Reserved */
410 buffer[11] = 0; /* Reserved */
411
412 /* Send bulk URB */
413 retval = usb_bulk_msg(data->usb_dev,
414 usb_sndbulkpipe(data->usb_dev,
415 data->bulk_out),
416 buffer, 12, &actual, USBTMC_TIMEOUT);
417
418 /* Store bTag (in case we need to abort) */
419 data->bTag_last_write = data->bTag;
420
421 /* Increment bTag -- and increment again if zero */
422 data->bTag++;
423 if (!data->bTag)
424 (data->bTag)++;
425
426 if (retval < 0) {
427 dev_err(dev, "usb_bulk_msg returned %d\n", retval);
428 if (data->auto_abort)
429 usbtmc_ioctl_abort_bulk_out(data);
430 goto exit;
431 }
432
433 /* Send bulk URB */
434 retval = usb_bulk_msg(data->usb_dev,
435 usb_rcvbulkpipe(data->usb_dev,
436 data->bulk_in),
437 buffer, USBTMC_SIZE_IOBUFFER, &actual,
438 USBTMC_TIMEOUT);
439
440 /* Store bTag (in case we need to abort) */
441 data->bTag_last_read = data->bTag;
442
443 if (retval < 0) {
444 dev_err(dev, "Unable to read data, error %d\n", retval);
445 if (data->auto_abort)
446 usbtmc_ioctl_abort_bulk_in(data);
447 goto exit;
448 }
449
450 /* How many characters did the instrument send? */
451 n_characters = buffer[4] +
452 (buffer[5] << 8) +
453 (buffer[6] << 16) +
454 (buffer[7] << 24);
455
456 /* Copy buffer to user space */
457 if (copy_to_user(buf + done, &buffer[12], n_characters)) {
458 /* There must have been an addressing problem */
459 retval = -EFAULT;
460 goto exit;
461 }
462
463 done += n_characters;
464 if (n_characters < USBTMC_SIZE_IOBUFFER)
465 remaining = 0;
466 }
467
468 /* Update file position value */
469 *f_pos = *f_pos + done;
470 retval = done;
471
472 exit:
473 mutex_unlock(&data->io_mutex);
474 kfree(buffer);
475 return retval;
476 }
477
478 static ssize_t usbtmc_write(struct file *filp, const char __user *buf,
479 size_t count, loff_t *f_pos)
480 {
481 struct usbtmc_device_data *data;
482 u8 *buffer;
483 int retval;
484 int actual;
485 unsigned long int n_bytes;
486 int remaining;
487 int done;
488 int this_part;
489
490 data = filp->private_data;
491
492 buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL);
493 if (!buffer)
494 return -ENOMEM;
495
496 mutex_lock(&data->io_mutex);
497
498 remaining = count;
499 done = 0;
500
501 while (remaining > 0) {
502 if (remaining > USBTMC_SIZE_IOBUFFER - 12) {
503 this_part = USBTMC_SIZE_IOBUFFER - 12;
504 buffer[8] = 0;
505 } else {
506 this_part = remaining;
507 buffer[8] = 1;
508 }
509
510 /* Setup IO buffer for DEV_DEP_MSG_OUT message */
511 buffer[0] = 1;
512 buffer[1] = data->bTag;
513 buffer[2] = ~(data->bTag);
514 buffer[3] = 0; /* Reserved */
515 buffer[4] = this_part & 255;
516 buffer[5] = (this_part >> 8) & 255;
517 buffer[6] = (this_part >> 16) & 255;
518 buffer[7] = (this_part >> 24) & 255;
519 /* buffer[8] is set above... */
520 buffer[9] = 0; /* Reserved */
521 buffer[10] = 0; /* Reserved */
522 buffer[11] = 0; /* Reserved */
523
524 if (copy_from_user(&buffer[12], buf + done, this_part)) {
525 retval = -EFAULT;
526 goto exit;
527 }
528
529 n_bytes = roundup(12 + this_part, 4);
530 memset(buffer + 12 + this_part, 0, n_bytes - (12 + this_part));
531
532 retval = usb_bulk_msg(data->usb_dev,
533 usb_sndbulkpipe(data->usb_dev,
534 data->bulk_out),
535 buffer, n_bytes, &actual, USBTMC_TIMEOUT);
536
537 data->bTag_last_write = data->bTag;
538 data->bTag++;
539
540 if (!data->bTag)
541 data->bTag++;
542
543 if (retval < 0) {
544 dev_err(&data->intf->dev,
545 "Unable to send data, error %d\n", retval);
546 if (data->auto_abort)
547 usbtmc_ioctl_abort_bulk_out(data);
548 goto exit;
549 }
550
551 remaining -= this_part;
552 done += this_part;
553 }
554
555 retval = count;
556 exit:
557 mutex_unlock(&data->io_mutex);
558 kfree(buffer);
559 return retval;
560 }
561
562 static int usbtmc_ioctl_clear(struct usbtmc_device_data *data)
563 {
564 struct usb_host_interface *current_setting;
565 struct usb_endpoint_descriptor *desc;
566 struct device *dev;
567 u8 *buffer;
568 int rv;
569 int n;
570 int actual;
571 int max_size;
572
573 dev = &data->intf->dev;
574
575 dev_dbg(dev, "Sending INITIATE_CLEAR request\n");
576
577 buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL);
578 if (!buffer)
579 return -ENOMEM;
580
581 rv = usb_control_msg(data->usb_dev,
582 usb_rcvctrlpipe(data->usb_dev, 0),
583 USBTMC_REQUEST_INITIATE_CLEAR,
584 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
585 0, 0, buffer, 1, USBTMC_TIMEOUT);
586 if (rv < 0) {
587 dev_err(dev, "usb_control_msg returned %d\n", rv);
588 goto exit;
589 }
590
591 dev_dbg(dev, "INITIATE_CLEAR returned %x\n", buffer[0]);
592
593 if (buffer[0] != USBTMC_STATUS_SUCCESS) {
594 dev_err(dev, "INITIATE_CLEAR returned %x\n", buffer[0]);
595 rv = -EPERM;
596 goto exit;
597 }
598
599 max_size = 0;
600 current_setting = data->intf->cur_altsetting;
601 for (n = 0; n < current_setting->desc.bNumEndpoints; n++) {
602 desc = &current_setting->endpoint[n].desc;
603 if (desc->bEndpointAddress == data->bulk_in)
604 max_size = le16_to_cpu(desc->wMaxPacketSize);
605 }
606
607 if (max_size == 0) {
608 dev_err(dev, "Couldn't get wMaxPacketSize\n");
609 rv = -EPERM;
610 goto exit;
611 }
612
613 dev_dbg(dev, "wMaxPacketSize is %d\n", max_size);
614
615 n = 0;
616
617 usbtmc_clear_check_status:
618
619 dev_dbg(dev, "Sending CHECK_CLEAR_STATUS request\n");
620
621 rv = usb_control_msg(data->usb_dev,
622 usb_rcvctrlpipe(data->usb_dev, 0),
623 USBTMC_REQUEST_CHECK_CLEAR_STATUS,
624 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
625 0, 0, buffer, 2, USBTMC_TIMEOUT);
626 if (rv < 0) {
627 dev_err(dev, "usb_control_msg returned %d\n", rv);
628 goto exit;
629 }
630
631 dev_dbg(dev, "CHECK_CLEAR_STATUS returned %x\n", buffer[0]);
632
633 if (buffer[0] == USBTMC_STATUS_SUCCESS)
634 goto usbtmc_clear_bulk_out_halt;
635
636 if (buffer[0] != USBTMC_STATUS_PENDING) {
637 dev_err(dev, "CHECK_CLEAR_STATUS returned %x\n", buffer[0]);
638 rv = -EPERM;
639 goto exit;
640 }
641
642 if (buffer[1] == 1)
643 do {
644 dev_dbg(dev, "Reading from bulk in EP\n");
645
646 rv = usb_bulk_msg(data->usb_dev,
647 usb_rcvbulkpipe(data->usb_dev,
648 data->bulk_in),
649 buffer, USBTMC_SIZE_IOBUFFER,
650 &actual, USBTMC_TIMEOUT);
651 n++;
652
653 if (rv < 0) {
654 dev_err(dev, "usb_control_msg returned %d\n",
655 rv);
656 goto exit;
657 }
658 } while ((actual == max_size) &&
659 (n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN));
660
661 if (actual == max_size) {
662 dev_err(dev, "Couldn't clear device buffer within %d cycles\n",
663 USBTMC_MAX_READS_TO_CLEAR_BULK_IN);
664 rv = -EPERM;
665 goto exit;
666 }
667
668 goto usbtmc_clear_check_status;
669
670 usbtmc_clear_bulk_out_halt:
671
672 rv = usb_control_msg(data->usb_dev,
673 usb_sndctrlpipe(data->usb_dev, 0),
674 USB_REQ_CLEAR_FEATURE,
675 USB_DIR_OUT | USB_TYPE_STANDARD |
676 USB_RECIP_ENDPOINT,
677 USB_ENDPOINT_HALT,
678 data->bulk_out, buffer, 0,
679 USBTMC_TIMEOUT);
680 if (rv < 0) {
681 dev_err(dev, "usb_control_msg returned %d\n", rv);
682 goto exit;
683 }
684 rv = 0;
685
686 exit:
687 kfree(buffer);
688 return rv;
689 }
690
691 static int usbtmc_ioctl_clear_out_halt(struct usbtmc_device_data *data)
692 {
693 u8 *buffer;
694 int rv;
695
696 buffer = kmalloc(2, GFP_KERNEL);
697 if (!buffer)
698 return -ENOMEM;
699
700 rv = usb_control_msg(data->usb_dev,
701 usb_sndctrlpipe(data->usb_dev, 0),
702 USB_REQ_CLEAR_FEATURE,
703 USB_DIR_OUT | USB_TYPE_STANDARD |
704 USB_RECIP_ENDPOINT,
705 USB_ENDPOINT_HALT, data->bulk_out,
706 buffer, 0, USBTMC_TIMEOUT);
707
708 if (rv < 0) {
709 dev_err(&data->usb_dev->dev, "usb_control_msg returned %d\n",
710 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_in_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_control_msg(data->usb_dev, usb_sndctrlpipe(data->usb_dev, 0),
730 USB_REQ_CLEAR_FEATURE,
731 USB_DIR_OUT | USB_TYPE_STANDARD |
732 USB_RECIP_ENDPOINT,
733 USB_ENDPOINT_HALT, data->bulk_in, buffer, 0,
734 USBTMC_TIMEOUT);
735
736 if (rv < 0) {
737 dev_err(&data->usb_dev->dev, "usb_control_msg returned %d\n",
738 rv);
739 goto exit;
740 }
741 rv = 0;
742
743 exit:
744 kfree(buffer);
745 return rv;
746 }
747
748 static int get_capabilities(struct usbtmc_device_data *data)
749 {
750 struct device *dev = &data->usb_dev->dev;
751 char *buffer;
752 int rv;
753
754 buffer = kmalloc(0x18, GFP_KERNEL);
755 if (!buffer)
756 return -ENOMEM;
757
758 rv = usb_control_msg(data->usb_dev, usb_rcvctrlpipe(data->usb_dev, 0),
759 USBTMC_REQUEST_GET_CAPABILITIES,
760 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
761 0, 0, buffer, 0x18, USBTMC_TIMEOUT);
762 if (rv < 0) {
763 dev_err(dev, "usb_control_msg returned %d\n", rv);
764 return rv;
765 }
766
767 dev_dbg(dev, "GET_CAPABILITIES returned %x\n", buffer[0]);
768 dev_dbg(dev, "Interface capabilities are %x\n", buffer[4]);
769 dev_dbg(dev, "Device capabilities are %x\n", buffer[5]);
770 dev_dbg(dev, "USB488 interface capabilities are %x\n", buffer[14]);
771 dev_dbg(dev, "USB488 device capabilities are %x\n", buffer[15]);
772 if (buffer[0] != USBTMC_STATUS_SUCCESS) {
773 dev_err(dev, "GET_CAPABILITIES returned %x\n", buffer[0]);
774 return -EPERM;
775 }
776
777 data->capabilities.interface_capabilities = buffer[4];
778 data->capabilities.device_capabilities = buffer[5];
779 data->capabilities.usb488_interface_capabilities = buffer[14];
780 data->capabilities.usb488_device_capabilities = buffer[15];
781
782 kfree(buffer);
783 return 0;
784 }
785
786 #define capability_attribute(name) \
787 static ssize_t show_##name(struct device *dev, \
788 struct device_attribute *attr, char *buf) \
789 { \
790 struct usb_interface *intf = to_usb_interface(dev); \
791 struct usbtmc_device_data *data = usb_get_intfdata(intf); \
792 \
793 return sprintf(buf, "%d\n", data->capabilities.name); \
794 } \
795 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)
796
797 capability_attribute(interface_capabilities);
798 capability_attribute(device_capabilities);
799 capability_attribute(usb488_interface_capabilities);
800 capability_attribute(usb488_device_capabilities);
801
802 static struct attribute *capability_attrs[] = {
803 &dev_attr_interface_capabilities.attr,
804 &dev_attr_device_capabilities.attr,
805 &dev_attr_usb488_interface_capabilities.attr,
806 &dev_attr_usb488_device_capabilities.attr,
807 NULL,
808 };
809
810 static struct attribute_group capability_attr_grp = {
811 .attrs = capability_attrs,
812 };
813
814 static ssize_t show_TermChar(struct device *dev,
815 struct device_attribute *attr, char *buf)
816 {
817 struct usb_interface *intf = to_usb_interface(dev);
818 struct usbtmc_device_data *data = usb_get_intfdata(intf);
819
820 return sprintf(buf, "%c\n", data->TermChar);
821 }
822
823 static ssize_t store_TermChar(struct device *dev,
824 struct device_attribute *attr,
825 const char *buf, size_t count)
826 {
827 struct usb_interface *intf = to_usb_interface(dev);
828 struct usbtmc_device_data *data = usb_get_intfdata(intf);
829
830 if (count < 1)
831 return -EINVAL;
832 data->TermChar = buf[0];
833 return count;
834 }
835 static DEVICE_ATTR(TermChar, S_IRUGO, show_TermChar, store_TermChar);
836
837 #define data_attribute(name) \
838 static ssize_t show_##name(struct device *dev, \
839 struct device_attribute *attr, char *buf) \
840 { \
841 struct usb_interface *intf = to_usb_interface(dev); \
842 struct usbtmc_device_data *data = usb_get_intfdata(intf); \
843 \
844 return sprintf(buf, "%d\n", data->name); \
845 } \
846 static ssize_t store_##name(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 ssize_t result; \
853 unsigned val; \
854 \
855 result = sscanf(buf, "%u\n", &val); \
856 if (result != 1) \
857 result = -EINVAL; \
858 data->name = val; \
859 if (result < 0) \
860 return result; \
861 else \
862 return count; \
863 } \
864 static DEVICE_ATTR(name, S_IRUGO, show_##name, store_##name)
865
866 data_attribute(TermCharEnabled);
867 data_attribute(auto_abort);
868
869 static struct attribute *data_attrs[] = {
870 &dev_attr_TermChar.attr,
871 &dev_attr_TermCharEnabled.attr,
872 &dev_attr_auto_abort.attr,
873 NULL,
874 };
875
876 static struct attribute_group data_attr_grp = {
877 .attrs = data_attrs,
878 };
879
880 static int usbtmc_ioctl_indicator_pulse(struct usbtmc_device_data *data)
881 {
882 struct device *dev;
883 u8 *buffer;
884 int rv;
885
886 dev = &data->intf->dev;
887
888 buffer = kmalloc(2, GFP_KERNEL);
889 if (!buffer)
890 return -ENOMEM;
891
892 rv = usb_control_msg(data->usb_dev,
893 usb_rcvctrlpipe(data->usb_dev, 0),
894 USBTMC_REQUEST_INDICATOR_PULSE,
895 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
896 0, 0, buffer, 0x01, USBTMC_TIMEOUT);
897
898 if (rv < 0) {
899 dev_err(dev, "usb_control_msg returned %d\n", rv);
900 goto exit;
901 }
902
903 dev_dbg(dev, "INDICATOR_PULSE returned %x\n", buffer[0]);
904
905 if (buffer[0] != USBTMC_STATUS_SUCCESS) {
906 dev_err(dev, "INDICATOR_PULSE returned %x\n", buffer[0]);
907 rv = -EPERM;
908 goto exit;
909 }
910 rv = 0;
911
912 exit:
913 kfree(buffer);
914 return rv;
915 }
916
917 static long usbtmc_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
918 {
919 struct usbtmc_device_data *data;
920 int retval = -EBADRQC;
921
922 data = file->private_data;
923 mutex_lock(&data->io_mutex);
924
925 switch (cmd) {
926 case USBTMC_IOCTL_CLEAR_OUT_HALT:
927 retval = usbtmc_ioctl_clear_out_halt(data);
928
929 case USBTMC_IOCTL_CLEAR_IN_HALT:
930 retval = usbtmc_ioctl_clear_in_halt(data);
931
932 case USBTMC_IOCTL_INDICATOR_PULSE:
933 retval = usbtmc_ioctl_indicator_pulse(data);
934
935 case USBTMC_IOCTL_CLEAR:
936 retval = usbtmc_ioctl_clear(data);
937
938 case USBTMC_IOCTL_ABORT_BULK_OUT:
939 retval = usbtmc_ioctl_abort_bulk_out(data);
940
941 case USBTMC_IOCTL_ABORT_BULK_IN:
942 retval = usbtmc_ioctl_abort_bulk_in(data);
943 }
944
945 mutex_unlock(&data->io_mutex);
946 return retval;
947 }
948
949 static struct file_operations fops = {
950 .owner = THIS_MODULE,
951 .read = usbtmc_read,
952 .write = usbtmc_write,
953 .open = usbtmc_open,
954 .release = usbtmc_release,
955 .unlocked_ioctl = usbtmc_ioctl,
956 };
957
958 static struct usb_class_driver usbtmc_class = {
959 .name = "usbtmc%d",
960 .fops = &fops,
961 .minor_base = USBTMC_MINOR_BASE,
962 };
963
964
965 static int usbtmc_probe(struct usb_interface *intf,
966 const struct usb_device_id *id)
967 {
968 struct usbtmc_device_data *data;
969 struct usb_host_interface *iface_desc;
970 struct usb_endpoint_descriptor *endpoint;
971 int n;
972 int retcode;
973
974 dev_dbg(&intf->dev, "%s called\n", __func__);
975
976 data = kmalloc(sizeof(struct usbtmc_device_data), GFP_KERNEL);
977 if (!data) {
978 dev_err(&intf->dev, "Unable to allocate kernel memory\n");
979 return -ENOMEM;
980 }
981
982 data->intf = intf;
983 data->id = id;
984 data->usb_dev = usb_get_dev(interface_to_usbdev(intf));
985 usb_set_intfdata(intf, data);
986 kref_init(&data->kref);
987 mutex_init(&data->io_mutex);
988
989 /* Initialize USBTMC bTag and other fields */
990 data->bTag = 1;
991 data->TermCharEnabled = 0;
992 data->TermChar = '\n';
993
994 /* USBTMC devices have only one setting, so use that */
995 iface_desc = data->intf->cur_altsetting;
996
997 /* Find bulk in endpoint */
998 for (n = 0; n < iface_desc->desc.bNumEndpoints; n++) {
999 endpoint = &iface_desc->endpoint[n].desc;
1000
1001 if (usb_endpoint_is_bulk_in(endpoint)) {
1002 data->bulk_in = endpoint->bEndpointAddress;
1003 dev_dbg(&intf->dev, "Found bulk in endpoint at %u\n",
1004 data->bulk_in);
1005 break;
1006 }
1007 }
1008
1009 /* Find bulk out endpoint */
1010 for (n = 0; n < iface_desc->desc.bNumEndpoints; n++) {
1011 endpoint = &iface_desc->endpoint[n].desc;
1012
1013 if (usb_endpoint_is_bulk_out(endpoint)) {
1014 data->bulk_out = endpoint->bEndpointAddress;
1015 dev_dbg(&intf->dev, "Found Bulk out endpoint at %u\n",
1016 data->bulk_out);
1017 break;
1018 }
1019 }
1020
1021 retcode = get_capabilities(data);
1022 if (retcode)
1023 dev_err(&intf->dev, "can't read capabilities\n");
1024 else
1025 retcode = sysfs_create_group(&intf->dev.kobj,
1026 &capability_attr_grp);
1027
1028 retcode = sysfs_create_group(&intf->dev.kobj, &data_attr_grp);
1029
1030 retcode = usb_register_dev(intf, &usbtmc_class);
1031 if (retcode) {
1032 dev_err(&intf->dev, "Not able to get a minor"
1033 " (base %u, slice default): %d\n", USBTMC_MINOR_BASE,
1034 retcode);
1035 goto error_register;
1036 }
1037 dev_dbg(&intf->dev, "Using minor number %d\n", intf->minor);
1038
1039 return 0;
1040
1041 error_register:
1042 sysfs_remove_group(&intf->dev.kobj, &capability_attr_grp);
1043 sysfs_remove_group(&intf->dev.kobj, &data_attr_grp);
1044 kref_put(&data->kref, usbtmc_delete);
1045 return retcode;
1046 }
1047
1048 static void usbtmc_disconnect(struct usb_interface *intf)
1049 {
1050 struct usbtmc_device_data *data;
1051
1052 dev_dbg(&intf->dev, "usbtmc_disconnect called\n");
1053
1054 data = usb_get_intfdata(intf);
1055 usb_deregister_dev(intf, &usbtmc_class);
1056 sysfs_remove_group(&intf->dev.kobj, &capability_attr_grp);
1057 sysfs_remove_group(&intf->dev.kobj, &data_attr_grp);
1058 kref_put(&data->kref, usbtmc_delete);
1059 }
1060
1061 static struct usb_driver usbtmc_driver = {
1062 .name = "usbtmc",
1063 .id_table = usbtmc_devices,
1064 .probe = usbtmc_probe,
1065 .disconnect = usbtmc_disconnect
1066 };
1067
1068 static int __init usbtmc_init(void)
1069 {
1070 int retcode;
1071
1072 retcode = usb_register(&usbtmc_driver);
1073 if (retcode)
1074 printk(KERN_ERR KBUILD_MODNAME": Unable to register driver\n");
1075 return retcode;
1076 }
1077 module_init(usbtmc_init);
1078
1079 static void __exit usbtmc_exit(void)
1080 {
1081 usb_deregister(&usbtmc_driver);
1082 }
1083 module_exit(usbtmc_exit);
1084
1085 MODULE_LICENSE("GPL");
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