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authorGreg Kroah-Hartman <gregkh@suse.de>2008-08-26 19:22:06 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2008-10-17 17:40:51 -0400
commit5b775f672cc993ba9dba5626811ab1f2ac42883b (patch)
tree61d8e0706a11e7bb808081720644b11ef58f77cd /drivers
parenteb86be5424d4c08e686d5e578b72a26c516ae58a (diff)
USB: add USB test and measurement class driver
This driver was originaly written by Stefan Kopp, but massively reworked by Greg for submission. Thanks to Felipe Balbi <me@felipebalbi.com> for lots of work in cleaning up this driver. Thanks to Oliver Neukum <oliver@neukum.org> for reviewing previous versions and pointing out problems. Cc: Stefan Kopp <stefan_kopp@agilent.com> Cc: Marcel Janssen <korgull@home.nl> Cc: Felipe Balbi <me@felipebalbi.com> Cc: Oliver Neukum <oliver@neukum.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/usb/class/Kconfig10
-rw-r--r--drivers/usb/class/Makefile1
-rw-r--r--drivers/usb/class/usbtmc.c1087
3 files changed, 1098 insertions, 0 deletions
diff --git a/drivers/usb/class/Kconfig b/drivers/usb/class/Kconfig
index 66f17ed88cb5..2519e320098f 100644
--- a/drivers/usb/class/Kconfig
+++ b/drivers/usb/class/Kconfig
@@ -40,3 +40,13 @@ config USB_WDM
40 To compile this driver as a module, choose M here: the 40 To compile this driver as a module, choose M here: the
41 module will be called cdc-wdm. 41 module will be called cdc-wdm.
42 42
43config USB_TMC
44 tristate "USB Test and Measurement Class support"
45 depends on USB
46 help
47 Say Y here if you want to connect a USB device that follows
48 the USB.org specification for USB Test and Measurement devices
49 to your computer's USB port.
50
51 To compile this driver as a module, choose M here: the
52 module will be called usbtmc.
diff --git a/drivers/usb/class/Makefile b/drivers/usb/class/Makefile
index 535d59a30600..32e85277b5cf 100644
--- a/drivers/usb/class/Makefile
+++ b/drivers/usb/class/Makefile
@@ -6,3 +6,4 @@
6obj-$(CONFIG_USB_ACM) += cdc-acm.o 6obj-$(CONFIG_USB_ACM) += cdc-acm.o
7obj-$(CONFIG_USB_PRINTER) += usblp.o 7obj-$(CONFIG_USB_PRINTER) += usblp.o
8obj-$(CONFIG_USB_WDM) += cdc-wdm.o 8obj-$(CONFIG_USB_WDM) += cdc-wdm.o
9obj-$(CONFIG_USB_TMC) += usbtmc.o
diff --git a/drivers/usb/class/usbtmc.c b/drivers/usb/class/usbtmc.c
new file mode 100644
index 000000000000..543811f6e6e8
--- /dev/null
+++ b/drivers/usb/class/usbtmc.c
@@ -0,0 +1,1087 @@
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/fs.h>
25#include <linux/uaccess.h>
26#include <linux/kref.h>
27#include <linux/mutex.h>
28#include <linux/usb.h>
29#include <linux/usb/tmc.h>
30
31
32#define USBTMC_MINOR_BASE 176
33
34/*
35 * Size of driver internal IO buffer. Must be multiple of 4 and at least as
36 * large as wMaxPacketSize (which is usually 512 bytes).
37 */
38#define USBTMC_SIZE_IOBUFFER 2048
39
40/* Default USB timeout (in milliseconds) */
41#define USBTMC_TIMEOUT 10
42
43/*
44 * Maximum number of read cycles to empty bulk in endpoint during CLEAR and
45 * ABORT_BULK_IN requests. Ends the loop if (for whatever reason) a short
46 * packet is never read.
47 */
48#define USBTMC_MAX_READS_TO_CLEAR_BULK_IN 100
49
50static struct usb_device_id usbtmc_devices[] = {
51 { USB_INTERFACE_INFO(USB_CLASS_APP_SPEC, 3, 0), },
52 { 0, } /* terminating entry */
53};
54
55/*
56 * This structure is the capabilities for the device
57 * See section 4.2.1.8 of the USBTMC specification for details.
58 */
59struct usbtmc_dev_capabilities {
60 __u8 interface_capabilities;
61 __u8 device_capabilities;
62 __u8 usb488_interface_capabilities;
63 __u8 usb488_device_capabilities;
64};
65
66/* This structure holds private data for each USBTMC device. One copy is
67 * allocated for each USBTMC device in the driver's probe function.
68 */
69struct usbtmc_device_data {
70 const struct usb_device_id *id;
71 struct usb_device *usb_dev;
72 struct usb_interface *intf;
73
74 unsigned int bulk_in;
75 unsigned int bulk_out;
76
77 u8 bTag;
78 u8 bTag_last_write; /* needed for abort */
79 u8 bTag_last_read; /* needed for abort */
80
81 /* attributes from the USB TMC spec for this device */
82 u8 TermChar;
83 bool TermCharEnabled;
84 bool auto_abort;
85
86 struct usbtmc_dev_capabilities capabilities;
87 struct kref kref;
88 struct mutex io_mutex; /* only one i/o function running at a time */
89};
90#define to_usbtmc_data(d) container_of(d, struct usbtmc_device_data, kref)
91
92/* Forward declarations */
93static struct usb_driver usbtmc_driver;
94
95static void usbtmc_delete(struct kref *kref)
96{
97 struct usbtmc_device_data *data = to_usbtmc_data(kref);
98
99 usb_put_dev(data->usb_dev);
100 kfree(data);
101}
102
103static int usbtmc_open(struct inode *inode, struct file *filp)
104{
105 struct usb_interface *intf;
106 struct usbtmc_device_data *data;
107 int retval = -ENODEV;
108
109 intf = usb_find_interface(&usbtmc_driver, iminor(inode));
110 if (!intf) {
111 printk(KERN_ERR KBUILD_MODNAME
112 ": can not find device for minor %d", iminor(inode));
113 goto exit;
114 }
115
116 data = usb_get_intfdata(intf);
117 kref_get(&data->kref);
118
119 /* Store pointer in file structure's private data field */
120 filp->private_data = data;
121
122exit:
123 return retval;
124}
125
126static int usbtmc_release(struct inode *inode, struct file *file)
127{
128 struct usbtmc_device_data *data = file->private_data;
129
130 kref_put(&data->kref, usbtmc_delete);
131 return 0;
132}
133
134static int usbtmc_ioctl_abort_bulk_in(struct usbtmc_device_data *data)
135{
136 char *buffer;
137 struct device *dev;
138 int rv;
139 int n;
140 int actual;
141 struct usb_host_interface *current_setting;
142 int max_size;
143
144 dev = &data->intf->dev;
145 buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL);
146 if (!buffer)
147 return -ENOMEM;
148
149 rv = usb_control_msg(data->usb_dev,
150 usb_rcvctrlpipe(data->usb_dev, 0),
151 USBTMC_REQUEST_INITIATE_ABORT_BULK_IN,
152 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT,
153 data->bTag_last_read, data->bulk_in,
154 buffer, 2, USBTMC_TIMEOUT);
155
156 if (rv < 0) {
157 dev_err(dev, "usb_control_msg returned %d\n", rv);
158 goto exit;
159 }
160
161 dev_dbg(dev, "INITIATE_ABORT_BULK_IN returned %x\n", buffer[0]);
162
163 if (buffer[0] == USBTMC_STATUS_FAILED) {
164 rv = 0;
165 goto exit;
166 }
167
168 if (buffer[0] != USBTMC_STATUS_SUCCESS) {
169 dev_err(dev, "INITIATE_ABORT_BULK_IN returned %x\n",
170 buffer[0]);
171 rv = -EPERM;
172 goto exit;
173 }
174
175 max_size = 0;
176 current_setting = data->intf->cur_altsetting;
177 for (n = 0; n < current_setting->desc.bNumEndpoints; n++)
178 if (current_setting->endpoint[n].desc.bEndpointAddress ==
179 data->bulk_in)
180 max_size = le16_to_cpu(current_setting->endpoint[n].
181 desc.wMaxPacketSize);
182
183 if (max_size == 0) {
184 dev_err(dev, "Couldn't get wMaxPacketSize\n");
185 rv = -EPERM;
186 goto exit;
187 }
188
189 dev_dbg(&data->intf->dev, "wMaxPacketSize is %d\n", max_size);
190
191 n = 0;
192
193 do {
194 dev_dbg(dev, "Reading from bulk in EP\n");
195
196 rv = usb_bulk_msg(data->usb_dev,
197 usb_rcvbulkpipe(data->usb_dev,
198 data->bulk_in),
199 buffer, USBTMC_SIZE_IOBUFFER,
200 &actual, USBTMC_TIMEOUT);
201
202 n++;
203
204 if (rv < 0) {
205 dev_err(dev, "usb_bulk_msg returned %d\n", rv);
206 goto exit;
207 }
208 } while ((actual == max_size) &&
209 (n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN));
210
211 if (actual == max_size) {
212 dev_err(dev, "Couldn't clear device buffer within %d cycles\n",
213 USBTMC_MAX_READS_TO_CLEAR_BULK_IN);
214 rv = -EPERM;
215 goto exit;
216 }
217
218 n = 0;
219
220usbtmc_abort_bulk_in_status:
221 rv = usb_control_msg(data->usb_dev,
222 usb_rcvctrlpipe(data->usb_dev, 0),
223 USBTMC_REQUEST_CHECK_ABORT_BULK_IN_STATUS,
224 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT,
225 0, data->bulk_in, buffer, 0x08,
226 USBTMC_TIMEOUT);
227
228 if (rv < 0) {
229 dev_err(dev, "usb_control_msg returned %d\n", rv);
230 goto exit;
231 }
232
233 dev_dbg(dev, "INITIATE_ABORT_BULK_IN returned %x\n", buffer[0]);
234
235 if (buffer[0] == USBTMC_STATUS_SUCCESS) {
236 rv = 0;
237 goto exit;
238 }
239
240 if (buffer[0] != USBTMC_STATUS_PENDING) {
241 dev_err(dev, "INITIATE_ABORT_BULK_IN returned %x\n", buffer[0]);
242 rv = -EPERM;
243 goto exit;
244 }
245
246 if (buffer[1] == 1)
247 do {
248 dev_dbg(dev, "Reading from bulk in EP\n");
249
250 rv = usb_bulk_msg(data->usb_dev,
251 usb_rcvbulkpipe(data->usb_dev,
252 data->bulk_in),
253 buffer, USBTMC_SIZE_IOBUFFER,
254 &actual, USBTMC_TIMEOUT);
255
256 n++;
257
258 if (rv < 0) {
259 dev_err(dev, "usb_bulk_msg returned %d\n", rv);
260 goto exit;
261 }
262 } while ((actual = max_size) &&
263 (n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN));
264
265 if (actual == max_size) {
266 dev_err(dev, "Couldn't clear device buffer within %d cycles\n",
267 USBTMC_MAX_READS_TO_CLEAR_BULK_IN);
268 rv = -EPERM;
269 goto exit;
270 }
271
272 goto usbtmc_abort_bulk_in_status;
273
274exit:
275 kfree(buffer);
276 return rv;
277
278}
279
280static int usbtmc_ioctl_abort_bulk_out(struct usbtmc_device_data *data)
281{
282 struct device *dev;
283 u8 *buffer;
284 int rv;
285 int n;
286
287 dev = &data->intf->dev;
288
289 buffer = kmalloc(8, GFP_KERNEL);
290 if (!buffer)
291 return -ENOMEM;
292
293 rv = usb_control_msg(data->usb_dev,
294 usb_rcvctrlpipe(data->usb_dev, 0),
295 USBTMC_REQUEST_INITIATE_ABORT_BULK_OUT,
296 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT,
297 data->bTag_last_write, data->bulk_out,
298 buffer, 2, USBTMC_TIMEOUT);
299
300 if (rv < 0) {
301 dev_err(dev, "usb_control_msg returned %d\n", rv);
302 goto exit;
303 }
304
305 dev_dbg(dev, "INITIATE_ABORT_BULK_OUT returned %x\n", buffer[0]);
306
307 if (buffer[0] != USBTMC_STATUS_SUCCESS) {
308 dev_err(dev, "INITIATE_ABORT_BULK_OUT returned %x\n",
309 buffer[0]);
310 rv = -EPERM;
311 goto exit;
312 }
313
314 n = 0;
315
316usbtmc_abort_bulk_out_check_status:
317 rv = usb_control_msg(data->usb_dev,
318 usb_rcvctrlpipe(data->usb_dev, 0),
319 USBTMC_REQUEST_CHECK_ABORT_BULK_OUT_STATUS,
320 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT,
321 0, data->bulk_out, buffer, 0x08,
322 USBTMC_TIMEOUT);
323 n++;
324 if (rv < 0) {
325 dev_err(dev, "usb_control_msg returned %d\n", rv);
326 goto exit;
327 }
328
329 dev_dbg(dev, "CHECK_ABORT_BULK_OUT returned %x\n", buffer[0]);
330
331 if (buffer[0] == USBTMC_STATUS_SUCCESS)
332 goto usbtmc_abort_bulk_out_clear_halt;
333
334 if ((buffer[0] == USBTMC_STATUS_PENDING) &&
335 (n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN))
336 goto usbtmc_abort_bulk_out_check_status;
337
338 rv = -EPERM;
339 goto exit;
340
341usbtmc_abort_bulk_out_clear_halt:
342 rv = usb_control_msg(data->usb_dev,
343 usb_sndctrlpipe(data->usb_dev, 0),
344 USB_REQ_CLEAR_FEATURE,
345 USB_DIR_OUT | USB_TYPE_STANDARD |
346 USB_RECIP_ENDPOINT,
347 USB_ENDPOINT_HALT, data->bulk_out, buffer,
348 0, USBTMC_TIMEOUT);
349
350 if (rv < 0) {
351 dev_err(dev, "usb_control_msg returned %d\n", rv);
352 goto exit;
353 }
354 rv = 0;
355
356exit:
357 kfree(buffer);
358 return rv;
359}
360
361static ssize_t usbtmc_read(struct file *filp, char __user *buf,
362 size_t count, loff_t *f_pos)
363{
364 struct usbtmc_device_data *data;
365 struct device *dev;
366 unsigned long int n_characters;
367 u8 *buffer;
368 int actual;
369 int done;
370 int remaining;
371 int retval;
372 int this_part;
373
374 /* Get pointer to private data structure */
375 data = filp->private_data;
376 dev = &data->intf->dev;
377
378 buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL);
379 if (!buffer)
380 return -ENOMEM;
381
382 mutex_lock(&data->io_mutex);
383
384 remaining = count;
385 done = 0;
386
387 while (remaining > 0) {
388 if (remaining > USBTMC_SIZE_IOBUFFER - 12 - 3)
389 this_part = USBTMC_SIZE_IOBUFFER - 12 - 3;
390 else
391 this_part = remaining;
392
393 /* Setup IO buffer for DEV_DEP_MSG_IN message
394 * Refer to class specs for details
395 */
396 buffer[0] = 2;
397 buffer[1] = data->bTag;
398 buffer[2] = ~(data->bTag);
399 buffer[3] = 0; /* Reserved */
400 buffer[4] = (this_part - 12 - 3) & 255;
401 buffer[5] = ((this_part - 12 - 3) >> 8) & 255;
402 buffer[6] = ((this_part - 12 - 3) >> 16) & 255;
403 buffer[7] = ((this_part - 12 - 3) >> 24) & 255;
404 buffer[8] = data->TermCharEnabled * 2;
405 /* Use term character? */
406 buffer[9] = data->TermChar;
407 buffer[10] = 0; /* Reserved */
408 buffer[11] = 0; /* Reserved */
409
410 /* Send bulk URB */
411 retval = usb_bulk_msg(data->usb_dev,
412 usb_sndbulkpipe(data->usb_dev,
413 data->bulk_out),
414 buffer, 12, &actual, USBTMC_TIMEOUT);
415
416 /* Store bTag (in case we need to abort) */
417 data->bTag_last_write = data->bTag;
418
419 /* Increment bTag -- and increment again if zero */
420 data->bTag++;
421 if (!data->bTag)
422 (data->bTag)++;
423
424 if (retval < 0) {
425 dev_err(dev, "usb_bulk_msg returned %d\n", retval);
426 if (data->auto_abort)
427 usbtmc_ioctl_abort_bulk_out(data);
428 goto exit;
429 }
430
431 /* Send bulk URB */
432 retval = usb_bulk_msg(data->usb_dev,
433 usb_rcvbulkpipe(data->usb_dev,
434 data->bulk_in),
435 buffer, USBTMC_SIZE_IOBUFFER, &actual,
436 USBTMC_TIMEOUT);
437
438 /* Store bTag (in case we need to abort) */
439 data->bTag_last_read = data->bTag;
440
441 if (retval < 0) {
442 dev_err(dev, "Unable to read data, error %d\n", retval);
443 if (data->auto_abort)
444 usbtmc_ioctl_abort_bulk_in(data);
445 goto exit;
446 }
447
448 /* How many characters did the instrument send? */
449 n_characters = buffer[4] +
450 (buffer[5] << 8) +
451 (buffer[6] << 16) +
452 (buffer[7] << 24);
453
454 /* Copy buffer to user space */
455 if (copy_to_user(buf + done, &buffer[12], n_characters)) {
456 /* There must have been an addressing problem */
457 retval = -EFAULT;
458 goto exit;
459 }
460
461 done += n_characters;
462 if (n_characters < USBTMC_SIZE_IOBUFFER)
463 remaining = 0;
464 }
465
466 /* Update file position value */
467 *f_pos = *f_pos + done;
468 retval = done;
469
470exit:
471 mutex_unlock(&data->io_mutex);
472 kfree(buffer);
473 return retval;
474}
475
476static ssize_t usbtmc_write(struct file *filp, const char __user *buf,
477 size_t count, loff_t *f_pos)
478{
479 struct usbtmc_device_data *data;
480 u8 *buffer;
481 int retval;
482 int actual;
483 unsigned long int n_bytes;
484 int n;
485 int remaining;
486 int done;
487 int this_part;
488
489 data = filp->private_data;
490
491 buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL);
492 if (!buffer)
493 return -ENOMEM;
494
495 mutex_lock(&data->io_mutex);
496
497 remaining = count;
498 done = 0;
499
500 while (remaining > 0) {
501 if (remaining > USBTMC_SIZE_IOBUFFER - 12) {
502 this_part = USBTMC_SIZE_IOBUFFER - 12;
503 buffer[8] = 0;
504 } else {
505 this_part = remaining;
506 buffer[8] = 1;
507 }
508
509 /* Setup IO buffer for DEV_DEP_MSG_OUT message */
510 buffer[0] = 1;
511 buffer[1] = data->bTag;
512 buffer[2] = ~(data->bTag);
513 buffer[3] = 0; /* Reserved */
514 buffer[4] = this_part & 255;
515 buffer[5] = (this_part >> 8) & 255;
516 buffer[6] = (this_part >> 16) & 255;
517 buffer[7] = (this_part >> 24) & 255;
518 /* buffer[8] is set above... */
519 buffer[9] = 0; /* Reserved */
520 buffer[10] = 0; /* Reserved */
521 buffer[11] = 0; /* Reserved */
522
523 if (copy_from_user(&buffer[12], buf + done, this_part)) {
524 retval = -EFAULT;
525 goto exit;
526 }
527
528 n_bytes = 12 + this_part;
529 if (this_part % 4)
530 n_bytes += 4 - this_part % 4;
531 for (n = 12 + this_part; n < n_bytes; n++)
532 buffer[n] = 0;
533
534 retval = usb_bulk_msg(data->usb_dev,
535 usb_sndbulkpipe(data->usb_dev,
536 data->bulk_out),
537 buffer, n_bytes, &actual, USBTMC_TIMEOUT);
538
539 data->bTag_last_write = data->bTag;
540 data->bTag++;
541
542 if (!data->bTag)
543 data->bTag++;
544
545 if (retval < 0) {
546 dev_err(&data->intf->dev,
547 "Unable to send data, error %d\n", retval);
548 if (data->auto_abort)
549 usbtmc_ioctl_abort_bulk_out(data);
550 goto exit;
551 }
552
553 remaining -= this_part;
554 done += this_part;
555 }
556
557 retval = count;
558exit:
559 mutex_unlock(&data->io_mutex);
560 kfree(buffer);
561 return retval;
562}
563
564static int usbtmc_ioctl_clear(struct usbtmc_device_data *data)
565{
566 struct usb_host_interface *current_setting;
567 struct usb_endpoint_descriptor *desc;
568 struct device *dev;
569 u8 *buffer;
570 int rv;
571 int n;
572 int actual;
573 int max_size;
574
575 dev = &data->intf->dev;
576
577 dev_dbg(dev, "Sending INITIATE_CLEAR request\n");
578
579 buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL);
580 if (!buffer)
581 return -ENOMEM;
582
583 rv = usb_control_msg(data->usb_dev,
584 usb_rcvctrlpipe(data->usb_dev, 0),
585 USBTMC_REQUEST_INITIATE_CLEAR,
586 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
587 0, 0, buffer, 1, USBTMC_TIMEOUT);
588 if (rv < 0) {
589 dev_err(dev, "usb_control_msg returned %d\n", rv);
590 goto exit;
591 }
592
593 dev_dbg(dev, "INITIATE_CLEAR returned %x\n", buffer[0]);
594
595 if (buffer[0] != USBTMC_STATUS_SUCCESS) {
596 dev_err(dev, "INITIATE_CLEAR returned %x\n", buffer[0]);
597 rv = -EPERM;
598 goto exit;
599 }
600
601 max_size = 0;
602 current_setting = data->intf->cur_altsetting;
603 for (n = 0; n < current_setting->desc.bNumEndpoints; n++) {
604 desc = &current_setting->endpoint[n].desc;
605 if (desc->bEndpointAddress == data->bulk_in)
606 max_size = le16_to_cpu(desc->wMaxPacketSize);
607 }
608
609 if (max_size == 0) {
610 dev_err(dev, "Couldn't get wMaxPacketSize\n");
611 rv = -EPERM;
612 goto exit;
613 }
614
615 dev_dbg(dev, "wMaxPacketSize is %d\n", max_size);
616
617 n = 0;
618
619usbtmc_clear_check_status:
620
621 dev_dbg(dev, "Sending CHECK_CLEAR_STATUS request\n");
622
623 rv = usb_control_msg(data->usb_dev,
624 usb_rcvctrlpipe(data->usb_dev, 0),
625 USBTMC_REQUEST_CHECK_CLEAR_STATUS,
626 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
627 0, 0, buffer, 2, USBTMC_TIMEOUT);
628 if (rv < 0) {
629 dev_err(dev, "usb_control_msg returned %d\n", rv);
630 goto exit;
631 }
632
633 dev_dbg(dev, "CHECK_CLEAR_STATUS returned %x\n", buffer[0]);
634
635 if (buffer[0] == USBTMC_STATUS_SUCCESS)
636 goto usbtmc_clear_bulk_out_halt;
637
638 if (buffer[0] != USBTMC_STATUS_PENDING) {
639 dev_err(dev, "CHECK_CLEAR_STATUS returned %x\n", buffer[0]);
640 rv = -EPERM;
641 goto exit;
642 }
643
644 if (buffer[1] == 1)
645 do {
646 dev_dbg(dev, "Reading from bulk in EP\n");
647
648 rv = usb_bulk_msg(data->usb_dev,
649 usb_rcvbulkpipe(data->usb_dev,
650 data->bulk_in),
651 buffer, USBTMC_SIZE_IOBUFFER,
652 &actual, USBTMC_TIMEOUT);
653 n++;
654
655 if (rv < 0) {
656 dev_err(dev, "usb_control_msg returned %d\n",
657 rv);
658 goto exit;
659 }
660 } while ((actual == max_size) &&
661 (n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN));
662
663 if (actual == max_size) {
664 dev_err(dev, "Couldn't clear device buffer within %d cycles\n",
665 USBTMC_MAX_READS_TO_CLEAR_BULK_IN);
666 rv = -EPERM;
667 goto exit;
668 }
669
670 goto usbtmc_clear_check_status;
671
672usbtmc_clear_bulk_out_halt:
673
674 rv = usb_control_msg(data->usb_dev,
675 usb_sndctrlpipe(data->usb_dev, 0),
676 USB_REQ_CLEAR_FEATURE,
677 USB_DIR_OUT | USB_TYPE_STANDARD |
678 USB_RECIP_ENDPOINT,
679 USB_ENDPOINT_HALT,
680 data->bulk_out, buffer, 0,
681 USBTMC_TIMEOUT);
682 if (rv < 0) {
683 dev_err(dev, "usb_control_msg returned %d\n", rv);
684 goto exit;
685 }
686 rv = 0;
687
688exit:
689 kfree(buffer);
690 return rv;
691}
692
693static int usbtmc_ioctl_clear_out_halt(struct usbtmc_device_data *data)
694{
695 u8 *buffer;
696 int rv;
697
698 buffer = kmalloc(2, GFP_KERNEL);
699 if (!buffer)
700 return -ENOMEM;
701
702 rv = usb_control_msg(data->usb_dev,
703 usb_sndctrlpipe(data->usb_dev, 0),
704 USB_REQ_CLEAR_FEATURE,
705 USB_DIR_OUT | USB_TYPE_STANDARD |
706 USB_RECIP_ENDPOINT,
707 USB_ENDPOINT_HALT, data->bulk_out,
708 buffer, 0, USBTMC_TIMEOUT);
709
710 if (rv < 0) {
711 dev_err(&data->usb_dev->dev, "usb_control_msg returned %d\n",
712 rv);
713 goto exit;
714 }
715 rv = 0;
716
717exit:
718 kfree(buffer);
719 return rv;
720}
721
722static int usbtmc_ioctl_clear_in_halt(struct usbtmc_device_data *data)
723{
724 u8 *buffer;
725 int rv;
726
727 buffer = kmalloc(2, GFP_KERNEL);
728 if (!buffer)
729 return -ENOMEM;
730
731 rv = usb_control_msg(data->usb_dev, usb_sndctrlpipe(data->usb_dev, 0),
732 USB_REQ_CLEAR_FEATURE,
733 USB_DIR_OUT | USB_TYPE_STANDARD |
734 USB_RECIP_ENDPOINT,
735 USB_ENDPOINT_HALT, data->bulk_in, buffer, 0,
736 USBTMC_TIMEOUT);
737
738 if (rv < 0) {
739 dev_err(&data->usb_dev->dev, "usb_control_msg returned %d\n",
740 rv);
741 goto exit;
742 }
743 rv = 0;
744
745exit:
746 kfree(buffer);
747 return rv;
748}
749
750static int get_capabilities(struct usbtmc_device_data *data)
751{
752 struct device *dev = &data->usb_dev->dev;
753 char *buffer;
754 int rv;
755
756 buffer = kmalloc(0x18, GFP_KERNEL);
757 if (!buffer)
758 return -ENOMEM;
759
760 rv = usb_control_msg(data->usb_dev, usb_rcvctrlpipe(data->usb_dev, 0),
761 USBTMC_REQUEST_GET_CAPABILITIES,
762 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
763 0, 0, buffer, 0x18, USBTMC_TIMEOUT);
764 if (rv < 0) {
765 dev_err(dev, "usb_control_msg returned %d\n", rv);
766 return rv;
767 }
768
769 dev_dbg(dev, "GET_CAPABILITIES returned %x\n", buffer[0]);
770 dev_dbg(dev, "Interface capabilities are %x\n", buffer[4]);
771 dev_dbg(dev, "Device capabilities are %x\n", buffer[5]);
772 dev_dbg(dev, "USB488 interface capabilities are %x\n", buffer[14]);
773 dev_dbg(dev, "USB488 device capabilities are %x\n", buffer[15]);
774 if (buffer[0] != USBTMC_STATUS_SUCCESS) {
775 dev_err(dev, "GET_CAPABILITIES returned %x\n", buffer[0]);
776 return -EPERM;
777 }
778
779 data->capabilities.interface_capabilities = buffer[4];
780 data->capabilities.device_capabilities = buffer[5];
781 data->capabilities.usb488_interface_capabilities = buffer[14];
782 data->capabilities.usb488_device_capabilities = buffer[15];
783
784 kfree(buffer);
785 return 0;
786}
787
788#define capability_attribute(name) \
789static ssize_t show_##name(struct device *dev, \
790 struct device_attribute *attr, char *buf) \
791{ \
792 struct usb_interface *intf = to_usb_interface(dev); \
793 struct usbtmc_device_data *data = usb_get_intfdata(intf); \
794 \
795 return sprintf(buf, "%d\n", data->capabilities.name); \
796} \
797static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)
798
799capability_attribute(interface_capabilities);
800capability_attribute(device_capabilities);
801capability_attribute(usb488_interface_capabilities);
802capability_attribute(usb488_device_capabilities);
803
804static struct attribute *capability_attrs[] = {
805 &dev_attr_interface_capabilities.attr,
806 &dev_attr_device_capabilities.attr,
807 &dev_attr_usb488_interface_capabilities.attr,
808 &dev_attr_usb488_device_capabilities.attr,
809 NULL,
810};
811
812static struct attribute_group capability_attr_grp = {
813 .attrs = capability_attrs,
814};
815
816static ssize_t show_TermChar(struct device *dev,
817 struct device_attribute *attr, char *buf)
818{
819 struct usb_interface *intf = to_usb_interface(dev);
820 struct usbtmc_device_data *data = usb_get_intfdata(intf);
821
822 return sprintf(buf, "%c\n", data->TermChar);
823}
824
825static ssize_t store_TermChar(struct device *dev,
826 struct device_attribute *attr,
827 const char *buf, size_t count)
828{
829 struct usb_interface *intf = to_usb_interface(dev);
830 struct usbtmc_device_data *data = usb_get_intfdata(intf);
831
832 if (count < 1)
833 return -EINVAL;
834 data->TermChar = buf[0];
835 return count;
836}
837static DEVICE_ATTR(TermChar, S_IRUGO, show_TermChar, store_TermChar);
838
839#define data_attribute(name) \
840static ssize_t show_##name(struct device *dev, \
841 struct device_attribute *attr, char *buf) \
842{ \
843 struct usb_interface *intf = to_usb_interface(dev); \
844 struct usbtmc_device_data *data = usb_get_intfdata(intf); \
845 \
846 return sprintf(buf, "%d\n", data->name); \
847} \
848static ssize_t store_##name(struct device *dev, \
849 struct device_attribute *attr, \
850 const char *buf, size_t count) \
851{ \
852 struct usb_interface *intf = to_usb_interface(dev); \
853 struct usbtmc_device_data *data = usb_get_intfdata(intf); \
854 ssize_t result; \
855 unsigned val; \
856 \
857 result = sscanf(buf, "%u\n", &val); \
858 if (result != 1) \
859 result = -EINVAL; \
860 data->name = val; \
861 if (result < 0) \
862 return result; \
863 else \
864 return count; \
865} \
866static DEVICE_ATTR(name, S_IRUGO, show_##name, store_##name)
867
868data_attribute(TermCharEnabled);
869data_attribute(auto_abort);
870
871static struct attribute *data_attrs[] = {
872 &dev_attr_TermChar.attr,
873 &dev_attr_TermCharEnabled.attr,
874 &dev_attr_auto_abort.attr,
875 NULL,
876};
877
878static struct attribute_group data_attr_grp = {
879 .attrs = data_attrs,
880};
881
882static int usbtmc_ioctl_indicator_pulse(struct usbtmc_device_data *data)
883{
884 struct device *dev;
885 u8 *buffer;
886 int rv;
887
888 dev = &data->intf->dev;
889
890 buffer = kmalloc(2, GFP_KERNEL);
891 if (!buffer)
892 return -ENOMEM;
893
894 rv = usb_control_msg(data->usb_dev,
895 usb_rcvctrlpipe(data->usb_dev, 0),
896 USBTMC_REQUEST_INDICATOR_PULSE,
897 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
898 0, 0, buffer, 0x01, USBTMC_TIMEOUT);
899
900 if (rv < 0) {
901 dev_err(dev, "usb_control_msg returned %d\n", rv);
902 goto exit;
903 }
904
905 dev_dbg(dev, "INDICATOR_PULSE returned %x\n", buffer[0]);
906
907 if (buffer[0] != USBTMC_STATUS_SUCCESS) {
908 dev_err(dev, "INDICATOR_PULSE returned %x\n", buffer[0]);
909 rv = -EPERM;
910 goto exit;
911 }
912 rv = 0;
913
914exit:
915 kfree(buffer);
916 return rv;
917}
918
919static long usbtmc_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
920{
921 struct usbtmc_device_data *data;
922 int retval = -EBADRQC;
923
924 data = file->private_data;
925 mutex_lock(&data->io_mutex);
926
927 switch (cmd) {
928 case USBTMC_IOCTL_CLEAR_OUT_HALT:
929 retval = usbtmc_ioctl_clear_out_halt(data);
930
931 case USBTMC_IOCTL_CLEAR_IN_HALT:
932 retval = usbtmc_ioctl_clear_in_halt(data);
933
934 case USBTMC_IOCTL_INDICATOR_PULSE:
935 retval = usbtmc_ioctl_indicator_pulse(data);
936
937 case USBTMC_IOCTL_CLEAR:
938 retval = usbtmc_ioctl_clear(data);
939
940 case USBTMC_IOCTL_ABORT_BULK_OUT:
941 retval = usbtmc_ioctl_abort_bulk_out(data);
942
943 case USBTMC_IOCTL_ABORT_BULK_IN:
944 retval = usbtmc_ioctl_abort_bulk_in(data);
945 }
946
947 mutex_unlock(&data->io_mutex);
948 return retval;
949}
950
951static struct file_operations fops = {
952 .owner = THIS_MODULE,
953 .read = usbtmc_read,
954 .write = usbtmc_write,
955 .open = usbtmc_open,
956 .release = usbtmc_release,
957 .unlocked_ioctl = usbtmc_ioctl,
958};
959
960static struct usb_class_driver usbtmc_class = {
961 .name = "usbtmc%d",
962 .fops = &fops,
963 .minor_base = USBTMC_MINOR_BASE,
964};
965
966
967static int usbtmc_probe(struct usb_interface *intf,
968 const struct usb_device_id *id)
969{
970 struct usbtmc_device_data *data;
971 struct usb_host_interface *iface_desc;
972 struct usb_endpoint_descriptor *endpoint;
973 int n;
974 int retcode;
975
976 dev_dbg(&intf->dev, "%s called\n", __func__);
977
978 data = kmalloc(sizeof(struct usbtmc_device_data), GFP_KERNEL);
979 if (!data) {
980 dev_err(&intf->dev, "Unable to allocate kernel memory\n");
981 return -ENOMEM;
982 }
983
984 data->intf = intf;
985 data->id = id;
986 data->usb_dev = usb_get_dev(interface_to_usbdev(intf));
987 usb_set_intfdata(intf, data);
988 kref_init(&data->kref);
989 mutex_init(&data->io_mutex);
990
991 /* Initialize USBTMC bTag and other fields */
992 data->bTag = 1;
993 data->TermCharEnabled = 0;
994 data->TermChar = '\n';
995
996 /* USBTMC devices have only one setting, so use that */
997 iface_desc = data->intf->cur_altsetting;
998
999 /* Find bulk in endpoint */
1000 for (n = 0; n < iface_desc->desc.bNumEndpoints; n++) {
1001 endpoint = &iface_desc->endpoint[n].desc;
1002
1003 if (usb_endpoint_is_bulk_in(endpoint)) {
1004 data->bulk_in = endpoint->bEndpointAddress;
1005 dev_dbg(&intf->dev, "Found bulk in endpoint at %u\n",
1006 data->bulk_in);
1007 break;
1008 }
1009 }
1010
1011 /* Find bulk out endpoint */
1012 for (n = 0; n < iface_desc->desc.bNumEndpoints; n++) {
1013 endpoint = &iface_desc->endpoint[n].desc;
1014
1015 if (usb_endpoint_is_bulk_out(endpoint)) {
1016 data->bulk_out = endpoint->bEndpointAddress;
1017 dev_dbg(&intf->dev, "Found Bulk out endpoint at %u\n",
1018 data->bulk_out);
1019 break;
1020 }
1021 }
1022
1023 retcode = get_capabilities(data);
1024 if (retcode)
1025 dev_err(&intf->dev, "can't read capabilities\n");
1026 else
1027 retcode = sysfs_create_group(&intf->dev.kobj,
1028 &capability_attr_grp);
1029
1030 retcode = sysfs_create_group(&intf->dev.kobj, &data_attr_grp);
1031
1032 retcode = usb_register_dev(intf, &usbtmc_class);
1033 if (retcode) {
1034 dev_err(&intf->dev, "Not able to get a minor"
1035 " (base %u, slice default): %d\n", USBTMC_MINOR_BASE,
1036 retcode);
1037 goto error_register;
1038 }
1039 dev_dbg(&intf->dev, "Using minor number %d\n", intf->minor);
1040
1041 return 0;
1042
1043error_register:
1044 sysfs_remove_group(&intf->dev.kobj, &capability_attr_grp);
1045 sysfs_remove_group(&intf->dev.kobj, &data_attr_grp);
1046 kref_put(&data->kref, usbtmc_delete);
1047 return retcode;
1048}
1049
1050static void usbtmc_disconnect(struct usb_interface *intf)
1051{
1052 struct usbtmc_device_data *data;
1053
1054 dev_dbg(&intf->dev, "usbtmc_disconnect called\n");
1055
1056 data = usb_get_intfdata(intf);
1057 usb_deregister_dev(intf, &usbtmc_class);
1058 sysfs_remove_group(&intf->dev.kobj, &capability_attr_grp);
1059 sysfs_remove_group(&intf->dev.kobj, &data_attr_grp);
1060 kref_put(&data->kref, usbtmc_delete);
1061}
1062
1063static struct usb_driver usbtmc_driver = {
1064 .name = "usbtmc",
1065 .id_table = usbtmc_devices,
1066 .probe = usbtmc_probe,
1067 .disconnect = usbtmc_disconnect
1068};
1069
1070static int __init usbtmc_init(void)
1071{
1072 int retcode;
1073
1074 retcode = usb_register(&usbtmc_driver);
1075 if (retcode)
1076 printk(KERN_ERR KBUILD_MODNAME": Unable to register driver\n");
1077 return retcode;
1078}
1079module_init(usbtmc_init);
1080
1081static void __exit usbtmc_exit(void)
1082{
1083 usb_deregister(&usbtmc_driver);
1084}
1085module_exit(usbtmc_exit);
1086
1087MODULE_LICENSE("GPL");
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-06 07:29:59 -0500