Commit | Line | Data |
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5b775f67 | 1 | /** |
af901ca1 | 2 | * drivers/usb/class/usbtmc.c - USB Test & Measurement class driver |
5b775f67 GKH |
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> | |
857cc4df | 24 | #include <linux/kernel.h> |
5b775f67 GKH |
25 | #include <linux/fs.h> |
26 | #include <linux/uaccess.h> | |
27 | #include <linux/kref.h> | |
5a0e3ad6 | 28 | #include <linux/slab.h> |
5b775f67 GKH |
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) */ | |
35f76e89 | 43 | #define USBTMC_TIMEOUT 5000 |
5b775f67 GKH |
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 | ||
6ef4852b | 52 | static const struct usb_device_id usbtmc_devices[] = { |
5b775f67 | 53 | { USB_INTERFACE_INFO(USB_CLASS_APP_SPEC, 3, 0), }, |
228dd05d | 54 | { USB_INTERFACE_INFO(USB_CLASS_APP_SPEC, 3, 1), }, |
5b775f67 GKH |
55 | { 0, } /* terminating entry */ |
56 | }; | |
5413aa46 | 57 | MODULE_DEVICE_TABLE(usb, usbtmc_devices); |
5b775f67 GKH |
58 | |
59 | /* | |
60 | * This structure is the capabilities for the device | |
d0a38365 GI |
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. | |
5b775f67 GKH |
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 | ||
86286883 ON |
92 | bool zombie; /* fd of disconnected device */ |
93 | ||
5b775f67 GKH |
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; | |
5b10916e | 115 | int retval = 0; |
5b775f67 GKH |
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)); | |
5b10916e | 121 | retval = -ENODEV; |
5b775f67 GKH |
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 | { | |
b361a6e3 | 145 | u8 *buffer; |
5b775f67 GKH |
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: | |
3342ecda SS |
351 | rv = usb_clear_halt(data->usb_dev, |
352 | usb_sndbulkpipe(data->usb_dev, data->bulk_out)); | |
5b775f67 GKH |
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; | |
665d7662 | 370 | u32 n_characters; |
5b775f67 GKH |
371 | u8 *buffer; |
372 | int actual; | |
665d7662 GS |
373 | size_t done; |
374 | size_t remaining; | |
5b775f67 | 375 | int retval; |
665d7662 | 376 | size_t this_part; |
5b775f67 GKH |
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); | |
86286883 ON |
387 | if (data->zombie) { |
388 | retval = -ENODEV; | |
389 | goto exit; | |
390 | } | |
5b775f67 GKH |
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 */ | |
c2cd26e1 SH |
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; | |
5b775f67 GKH |
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 | ||
665d7662 GS |
462 | /* Ensure the instrument doesn't lie about it */ |
463 | if(n_characters > actual - 12) { | |
a2fbf10e | 464 | dev_err(dev, "Device lies about message size: %u > %d\n", n_characters, actual - 12); |
665d7662 GS |
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 | ||
92d07e42 SH |
474 | /* Bound amount of data received by amount of data requested */ |
475 | if (n_characters > this_part) | |
476 | n_characters = this_part; | |
477 | ||
5b775f67 GKH |
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; | |
4143d178 SH |
486 | /* Terminate if end-of-message bit recieved from device */ |
487 | if ((buffer[8] & 0x01) && (actual >= n_characters + 12)) | |
5b775f67 | 488 | remaining = 0; |
665d7662 GS |
489 | else |
490 | remaining -= n_characters; | |
5b775f67 GKH |
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; | |
5b775f67 GKH |
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); | |
86286883 ON |
522 | if (data->zombie) { |
523 | retval = -ENODEV; | |
524 | goto exit; | |
525 | } | |
5b775f67 GKH |
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 | ||
857cc4df IJ |
558 | n_bytes = roundup(12 + this_part, 4); |
559 | memset(buffer + 12 + this_part, 0, n_bytes - (12 + this_part)); | |
5b775f67 | 560 | |
ec412b92 AH |
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); | |
5b775f67 GKH |
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 = ¤t_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 | ||
3342ecda SS |
707 | rv = usb_clear_halt(data->usb_dev, |
708 | usb_sndbulkpipe(data->usb_dev, data->bulk_out)); | |
5b775f67 GKH |
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 | ||
3342ecda SS |
729 | rv = usb_clear_halt(data->usb_dev, |
730 | usb_sndbulkpipe(data->usb_dev, data->bulk_out)); | |
5b775f67 GKH |
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 | ||
3342ecda SS |
753 | rv = usb_clear_halt(data->usb_dev, |
754 | usb_rcvbulkpipe(data->usb_dev, data->bulk_in)); | |
5b775f67 GKH |
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; | |
ca157c4a | 772 | int rv = 0; |
5b775f67 GKH |
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); | |
ca157c4a | 784 | goto err_out; |
5b775f67 GKH |
785 | } |
786 | ||
787 | dev_dbg(dev, "GET_CAPABILITIES returned %x\n", buffer[0]); | |
5b775f67 GKH |
788 | if (buffer[0] != USBTMC_STATUS_SUCCESS) { |
789 | dev_err(dev, "GET_CAPABILITIES returned %x\n", buffer[0]); | |
ca157c4a ON |
790 | rv = -EPERM; |
791 | goto err_out; | |
5b775f67 | 792 | } |
d0a38365 GI |
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]); | |
5b775f67 GKH |
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]; | |
d0a38365 | 802 | rv = 0; |
5b775f67 | 803 | |
ca157c4a | 804 | err_out: |
5b775f67 | 805 | kfree(buffer); |
ca157c4a | 806 | return rv; |
5b775f67 GKH |
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); | |
86286883 ON |
947 | if (data->zombie) { |
948 | retval = -ENODEV; | |
949 | goto skip_io_on_zombie; | |
950 | } | |
5b775f67 GKH |
951 | |
952 | switch (cmd) { | |
953 | case USBTMC_IOCTL_CLEAR_OUT_HALT: | |
954 | retval = usbtmc_ioctl_clear_out_halt(data); | |
a92b63e7 | 955 | break; |
5b775f67 GKH |
956 | |
957 | case USBTMC_IOCTL_CLEAR_IN_HALT: | |
958 | retval = usbtmc_ioctl_clear_in_halt(data); | |
a92b63e7 | 959 | break; |
5b775f67 GKH |
960 | |
961 | case USBTMC_IOCTL_INDICATOR_PULSE: | |
962 | retval = usbtmc_ioctl_indicator_pulse(data); | |
a92b63e7 | 963 | break; |
5b775f67 GKH |
964 | |
965 | case USBTMC_IOCTL_CLEAR: | |
966 | retval = usbtmc_ioctl_clear(data); | |
a92b63e7 | 967 | break; |
5b775f67 GKH |
968 | |
969 | case USBTMC_IOCTL_ABORT_BULK_OUT: | |
970 | retval = usbtmc_ioctl_abort_bulk_out(data); | |
a92b63e7 | 971 | break; |
5b775f67 GKH |
972 | |
973 | case USBTMC_IOCTL_ABORT_BULK_IN: | |
974 | retval = usbtmc_ioctl_abort_bulk_in(data); | |
a92b63e7 | 975 | break; |
5b775f67 GKH |
976 | } |
977 | ||
86286883 | 978 | skip_io_on_zombie: |
5b775f67 GKH |
979 | mutex_unlock(&data->io_mutex); |
980 | return retval; | |
981 | } | |
982 | ||
828c0950 | 983 | static const struct file_operations fops = { |
5b775f67 GKH |
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, | |
6038f373 | 990 | .llseek = default_llseek, |
5b775f67 GKH |
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); | |
86286883 | 1023 | data->zombie = 0; |
5b775f67 GKH |
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); | |
86286883 ON |
1094 | mutex_lock(&data->io_mutex); |
1095 | data->zombie = 1; | |
1096 | mutex_unlock(&data->io_mutex); | |
5b775f67 GKH |
1097 | kref_put(&data->kref, usbtmc_delete); |
1098 | } | |
1099 | ||
dca8cd04 | 1100 | static int usbtmc_suspend(struct usb_interface *intf, pm_message_t message) |
a4708103 ON |
1101 | { |
1102 | /* this driver does not have pending URBs */ | |
1103 | return 0; | |
1104 | } | |
1105 | ||
dca8cd04 | 1106 | static int usbtmc_resume(struct usb_interface *intf) |
a4708103 ON |
1107 | { |
1108 | return 0; | |
1109 | } | |
1110 | ||
5b775f67 GKH |
1111 | static struct usb_driver usbtmc_driver = { |
1112 | .name = "usbtmc", | |
1113 | .id_table = usbtmc_devices, | |
1114 | .probe = usbtmc_probe, | |
a4708103 ON |
1115 | .disconnect = usbtmc_disconnect, |
1116 | .suspend = usbtmc_suspend, | |
1117 | .resume = usbtmc_resume, | |
5b775f67 GKH |
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"); |