Commit | Line | Data |
---|---|---|
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) | |
29cc8897 | 189 | max_size = usb_endpoint_maxp(¤t_setting->endpoint[n].desc); |
5b775f67 GKH |
190 | |
191 | if (max_size == 0) { | |
192 | dev_err(dev, "Couldn't get wMaxPacketSize\n"); | |
193 | rv = -EPERM; | |
194 | goto exit; | |
195 | } | |
196 | ||
197 | dev_dbg(&data->intf->dev, "wMaxPacketSize is %d\n", max_size); | |
198 | ||
199 | n = 0; | |
200 | ||
201 | do { | |
202 | dev_dbg(dev, "Reading from bulk in EP\n"); | |
203 | ||
204 | rv = usb_bulk_msg(data->usb_dev, | |
205 | usb_rcvbulkpipe(data->usb_dev, | |
206 | data->bulk_in), | |
207 | buffer, USBTMC_SIZE_IOBUFFER, | |
208 | &actual, USBTMC_TIMEOUT); | |
209 | ||
210 | n++; | |
211 | ||
212 | if (rv < 0) { | |
213 | dev_err(dev, "usb_bulk_msg returned %d\n", rv); | |
214 | goto exit; | |
215 | } | |
216 | } while ((actual == max_size) && | |
217 | (n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN)); | |
218 | ||
219 | if (actual == max_size) { | |
220 | dev_err(dev, "Couldn't clear device buffer within %d cycles\n", | |
221 | USBTMC_MAX_READS_TO_CLEAR_BULK_IN); | |
222 | rv = -EPERM; | |
223 | goto exit; | |
224 | } | |
225 | ||
226 | n = 0; | |
227 | ||
228 | usbtmc_abort_bulk_in_status: | |
229 | rv = usb_control_msg(data->usb_dev, | |
230 | usb_rcvctrlpipe(data->usb_dev, 0), | |
231 | USBTMC_REQUEST_CHECK_ABORT_BULK_IN_STATUS, | |
232 | USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT, | |
233 | 0, data->bulk_in, buffer, 0x08, | |
234 | USBTMC_TIMEOUT); | |
235 | ||
236 | if (rv < 0) { | |
237 | dev_err(dev, "usb_control_msg returned %d\n", rv); | |
238 | goto exit; | |
239 | } | |
240 | ||
241 | dev_dbg(dev, "INITIATE_ABORT_BULK_IN returned %x\n", buffer[0]); | |
242 | ||
243 | if (buffer[0] == USBTMC_STATUS_SUCCESS) { | |
244 | rv = 0; | |
245 | goto exit; | |
246 | } | |
247 | ||
248 | if (buffer[0] != USBTMC_STATUS_PENDING) { | |
249 | dev_err(dev, "INITIATE_ABORT_BULK_IN returned %x\n", buffer[0]); | |
250 | rv = -EPERM; | |
251 | goto exit; | |
252 | } | |
253 | ||
254 | if (buffer[1] == 1) | |
255 | do { | |
256 | dev_dbg(dev, "Reading from bulk in EP\n"); | |
257 | ||
258 | rv = usb_bulk_msg(data->usb_dev, | |
259 | usb_rcvbulkpipe(data->usb_dev, | |
260 | data->bulk_in), | |
261 | buffer, USBTMC_SIZE_IOBUFFER, | |
262 | &actual, USBTMC_TIMEOUT); | |
263 | ||
264 | n++; | |
265 | ||
266 | if (rv < 0) { | |
267 | dev_err(dev, "usb_bulk_msg returned %d\n", rv); | |
268 | goto exit; | |
269 | } | |
4f1a7a3e | 270 | } while ((actual == max_size) && |
5b775f67 GKH |
271 | (n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN)); |
272 | ||
273 | if (actual == max_size) { | |
274 | dev_err(dev, "Couldn't clear device buffer within %d cycles\n", | |
275 | USBTMC_MAX_READS_TO_CLEAR_BULK_IN); | |
276 | rv = -EPERM; | |
277 | goto exit; | |
278 | } | |
279 | ||
280 | goto usbtmc_abort_bulk_in_status; | |
281 | ||
282 | exit: | |
283 | kfree(buffer); | |
284 | return rv; | |
285 | ||
286 | } | |
287 | ||
288 | static int usbtmc_ioctl_abort_bulk_out(struct usbtmc_device_data *data) | |
289 | { | |
290 | struct device *dev; | |
291 | u8 *buffer; | |
292 | int rv; | |
293 | int n; | |
294 | ||
295 | dev = &data->intf->dev; | |
296 | ||
297 | buffer = kmalloc(8, GFP_KERNEL); | |
298 | if (!buffer) | |
299 | return -ENOMEM; | |
300 | ||
301 | rv = usb_control_msg(data->usb_dev, | |
302 | usb_rcvctrlpipe(data->usb_dev, 0), | |
303 | USBTMC_REQUEST_INITIATE_ABORT_BULK_OUT, | |
304 | USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT, | |
305 | data->bTag_last_write, data->bulk_out, | |
306 | buffer, 2, USBTMC_TIMEOUT); | |
307 | ||
308 | if (rv < 0) { | |
309 | dev_err(dev, "usb_control_msg returned %d\n", rv); | |
310 | goto exit; | |
311 | } | |
312 | ||
313 | dev_dbg(dev, "INITIATE_ABORT_BULK_OUT returned %x\n", buffer[0]); | |
314 | ||
315 | if (buffer[0] != USBTMC_STATUS_SUCCESS) { | |
316 | dev_err(dev, "INITIATE_ABORT_BULK_OUT returned %x\n", | |
317 | buffer[0]); | |
318 | rv = -EPERM; | |
319 | goto exit; | |
320 | } | |
321 | ||
322 | n = 0; | |
323 | ||
324 | usbtmc_abort_bulk_out_check_status: | |
325 | rv = usb_control_msg(data->usb_dev, | |
326 | usb_rcvctrlpipe(data->usb_dev, 0), | |
327 | USBTMC_REQUEST_CHECK_ABORT_BULK_OUT_STATUS, | |
328 | USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT, | |
329 | 0, data->bulk_out, buffer, 0x08, | |
330 | USBTMC_TIMEOUT); | |
331 | n++; | |
332 | if (rv < 0) { | |
333 | dev_err(dev, "usb_control_msg returned %d\n", rv); | |
334 | goto exit; | |
335 | } | |
336 | ||
337 | dev_dbg(dev, "CHECK_ABORT_BULK_OUT returned %x\n", buffer[0]); | |
338 | ||
339 | if (buffer[0] == USBTMC_STATUS_SUCCESS) | |
340 | goto usbtmc_abort_bulk_out_clear_halt; | |
341 | ||
342 | if ((buffer[0] == USBTMC_STATUS_PENDING) && | |
343 | (n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN)) | |
344 | goto usbtmc_abort_bulk_out_check_status; | |
345 | ||
346 | rv = -EPERM; | |
347 | goto exit; | |
348 | ||
349 | usbtmc_abort_bulk_out_clear_halt: | |
3342ecda SS |
350 | rv = usb_clear_halt(data->usb_dev, |
351 | usb_sndbulkpipe(data->usb_dev, data->bulk_out)); | |
5b775f67 GKH |
352 | |
353 | if (rv < 0) { | |
354 | dev_err(dev, "usb_control_msg returned %d\n", rv); | |
355 | goto exit; | |
356 | } | |
357 | rv = 0; | |
358 | ||
359 | exit: | |
360 | kfree(buffer); | |
361 | return rv; | |
362 | } | |
363 | ||
364 | static ssize_t usbtmc_read(struct file *filp, char __user *buf, | |
365 | size_t count, loff_t *f_pos) | |
366 | { | |
367 | struct usbtmc_device_data *data; | |
368 | struct device *dev; | |
665d7662 | 369 | u32 n_characters; |
5b775f67 GKH |
370 | u8 *buffer; |
371 | int actual; | |
665d7662 GS |
372 | size_t done; |
373 | size_t remaining; | |
5b775f67 | 374 | int retval; |
665d7662 | 375 | size_t this_part; |
5b775f67 GKH |
376 | |
377 | /* Get pointer to private data structure */ | |
378 | data = filp->private_data; | |
379 | dev = &data->intf->dev; | |
380 | ||
381 | buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL); | |
382 | if (!buffer) | |
383 | return -ENOMEM; | |
384 | ||
385 | mutex_lock(&data->io_mutex); | |
86286883 ON |
386 | if (data->zombie) { |
387 | retval = -ENODEV; | |
388 | goto exit; | |
389 | } | |
5b775f67 GKH |
390 | |
391 | remaining = count; | |
392 | done = 0; | |
393 | ||
394 | while (remaining > 0) { | |
395 | if (remaining > USBTMC_SIZE_IOBUFFER - 12 - 3) | |
396 | this_part = USBTMC_SIZE_IOBUFFER - 12 - 3; | |
397 | else | |
398 | this_part = remaining; | |
399 | ||
400 | /* Setup IO buffer for DEV_DEP_MSG_IN message | |
401 | * Refer to class specs for details | |
402 | */ | |
403 | buffer[0] = 2; | |
404 | buffer[1] = data->bTag; | |
405 | buffer[2] = ~(data->bTag); | |
406 | buffer[3] = 0; /* Reserved */ | |
c2cd26e1 SH |
407 | buffer[4] = (this_part) & 255; |
408 | buffer[5] = ((this_part) >> 8) & 255; | |
409 | buffer[6] = ((this_part) >> 16) & 255; | |
410 | buffer[7] = ((this_part) >> 24) & 255; | |
5b775f67 GKH |
411 | buffer[8] = data->TermCharEnabled * 2; |
412 | /* Use term character? */ | |
413 | buffer[9] = data->TermChar; | |
414 | buffer[10] = 0; /* Reserved */ | |
415 | buffer[11] = 0; /* Reserved */ | |
416 | ||
417 | /* Send bulk URB */ | |
418 | retval = usb_bulk_msg(data->usb_dev, | |
419 | usb_sndbulkpipe(data->usb_dev, | |
420 | data->bulk_out), | |
421 | buffer, 12, &actual, USBTMC_TIMEOUT); | |
422 | ||
423 | /* Store bTag (in case we need to abort) */ | |
424 | data->bTag_last_write = data->bTag; | |
425 | ||
426 | /* Increment bTag -- and increment again if zero */ | |
427 | data->bTag++; | |
428 | if (!data->bTag) | |
429 | (data->bTag)++; | |
430 | ||
431 | if (retval < 0) { | |
432 | dev_err(dev, "usb_bulk_msg returned %d\n", retval); | |
433 | if (data->auto_abort) | |
434 | usbtmc_ioctl_abort_bulk_out(data); | |
435 | goto exit; | |
436 | } | |
437 | ||
438 | /* Send bulk URB */ | |
439 | retval = usb_bulk_msg(data->usb_dev, | |
440 | usb_rcvbulkpipe(data->usb_dev, | |
441 | data->bulk_in), | |
442 | buffer, USBTMC_SIZE_IOBUFFER, &actual, | |
443 | USBTMC_TIMEOUT); | |
444 | ||
445 | /* Store bTag (in case we need to abort) */ | |
446 | data->bTag_last_read = data->bTag; | |
447 | ||
448 | if (retval < 0) { | |
449 | dev_err(dev, "Unable to read data, error %d\n", retval); | |
450 | if (data->auto_abort) | |
451 | usbtmc_ioctl_abort_bulk_in(data); | |
452 | goto exit; | |
453 | } | |
454 | ||
455 | /* How many characters did the instrument send? */ | |
456 | n_characters = buffer[4] + | |
457 | (buffer[5] << 8) + | |
458 | (buffer[6] << 16) + | |
459 | (buffer[7] << 24); | |
460 | ||
665d7662 GS |
461 | /* Ensure the instrument doesn't lie about it */ |
462 | if(n_characters > actual - 12) { | |
a2fbf10e | 463 | dev_err(dev, "Device lies about message size: %u > %d\n", n_characters, actual - 12); |
665d7662 GS |
464 | n_characters = actual - 12; |
465 | } | |
466 | ||
467 | /* Ensure the instrument doesn't send more back than requested */ | |
468 | if(n_characters > this_part) { | |
469 | dev_err(dev, "Device returns more than requested: %zu > %zu\n", done + n_characters, done + this_part); | |
470 | n_characters = this_part; | |
471 | } | |
472 | ||
92d07e42 SH |
473 | /* Bound amount of data received by amount of data requested */ |
474 | if (n_characters > this_part) | |
475 | n_characters = this_part; | |
476 | ||
5b775f67 GKH |
477 | /* Copy buffer to user space */ |
478 | if (copy_to_user(buf + done, &buffer[12], n_characters)) { | |
479 | /* There must have been an addressing problem */ | |
480 | retval = -EFAULT; | |
481 | goto exit; | |
482 | } | |
483 | ||
484 | done += n_characters; | |
25985edc | 485 | /* Terminate if end-of-message bit received from device */ |
4143d178 | 486 | if ((buffer[8] & 0x01) && (actual >= n_characters + 12)) |
5b775f67 | 487 | remaining = 0; |
665d7662 GS |
488 | else |
489 | remaining -= n_characters; | |
5b775f67 GKH |
490 | } |
491 | ||
492 | /* Update file position value */ | |
493 | *f_pos = *f_pos + done; | |
494 | retval = done; | |
495 | ||
496 | exit: | |
497 | mutex_unlock(&data->io_mutex); | |
498 | kfree(buffer); | |
499 | return retval; | |
500 | } | |
501 | ||
502 | static ssize_t usbtmc_write(struct file *filp, const char __user *buf, | |
503 | size_t count, loff_t *f_pos) | |
504 | { | |
505 | struct usbtmc_device_data *data; | |
506 | u8 *buffer; | |
507 | int retval; | |
508 | int actual; | |
509 | unsigned long int n_bytes; | |
5b775f67 GKH |
510 | int remaining; |
511 | int done; | |
512 | int this_part; | |
513 | ||
514 | data = filp->private_data; | |
515 | ||
516 | buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL); | |
517 | if (!buffer) | |
518 | return -ENOMEM; | |
519 | ||
520 | mutex_lock(&data->io_mutex); | |
86286883 ON |
521 | if (data->zombie) { |
522 | retval = -ENODEV; | |
523 | goto exit; | |
524 | } | |
5b775f67 GKH |
525 | |
526 | remaining = count; | |
527 | done = 0; | |
528 | ||
529 | while (remaining > 0) { | |
530 | if (remaining > USBTMC_SIZE_IOBUFFER - 12) { | |
531 | this_part = USBTMC_SIZE_IOBUFFER - 12; | |
532 | buffer[8] = 0; | |
533 | } else { | |
534 | this_part = remaining; | |
535 | buffer[8] = 1; | |
536 | } | |
537 | ||
538 | /* Setup IO buffer for DEV_DEP_MSG_OUT message */ | |
539 | buffer[0] = 1; | |
540 | buffer[1] = data->bTag; | |
541 | buffer[2] = ~(data->bTag); | |
542 | buffer[3] = 0; /* Reserved */ | |
543 | buffer[4] = this_part & 255; | |
544 | buffer[5] = (this_part >> 8) & 255; | |
545 | buffer[6] = (this_part >> 16) & 255; | |
546 | buffer[7] = (this_part >> 24) & 255; | |
547 | /* buffer[8] is set above... */ | |
548 | buffer[9] = 0; /* Reserved */ | |
549 | buffer[10] = 0; /* Reserved */ | |
550 | buffer[11] = 0; /* Reserved */ | |
551 | ||
552 | if (copy_from_user(&buffer[12], buf + done, this_part)) { | |
553 | retval = -EFAULT; | |
554 | goto exit; | |
555 | } | |
556 | ||
857cc4df IJ |
557 | n_bytes = roundup(12 + this_part, 4); |
558 | memset(buffer + 12 + this_part, 0, n_bytes - (12 + this_part)); | |
5b775f67 | 559 | |
ec412b92 AH |
560 | do { |
561 | retval = usb_bulk_msg(data->usb_dev, | |
562 | usb_sndbulkpipe(data->usb_dev, | |
563 | data->bulk_out), | |
564 | buffer, n_bytes, | |
565 | &actual, USBTMC_TIMEOUT); | |
566 | if (retval != 0) | |
567 | break; | |
568 | n_bytes -= actual; | |
569 | } while (n_bytes); | |
5b775f67 GKH |
570 | |
571 | data->bTag_last_write = data->bTag; | |
572 | data->bTag++; | |
573 | ||
574 | if (!data->bTag) | |
575 | data->bTag++; | |
576 | ||
577 | if (retval < 0) { | |
578 | dev_err(&data->intf->dev, | |
579 | "Unable to send data, error %d\n", retval); | |
580 | if (data->auto_abort) | |
581 | usbtmc_ioctl_abort_bulk_out(data); | |
582 | goto exit; | |
583 | } | |
584 | ||
585 | remaining -= this_part; | |
586 | done += this_part; | |
587 | } | |
588 | ||
589 | retval = count; | |
590 | exit: | |
591 | mutex_unlock(&data->io_mutex); | |
592 | kfree(buffer); | |
593 | return retval; | |
594 | } | |
595 | ||
596 | static int usbtmc_ioctl_clear(struct usbtmc_device_data *data) | |
597 | { | |
598 | struct usb_host_interface *current_setting; | |
599 | struct usb_endpoint_descriptor *desc; | |
600 | struct device *dev; | |
601 | u8 *buffer; | |
602 | int rv; | |
603 | int n; | |
604 | int actual; | |
605 | int max_size; | |
606 | ||
607 | dev = &data->intf->dev; | |
608 | ||
609 | dev_dbg(dev, "Sending INITIATE_CLEAR request\n"); | |
610 | ||
611 | buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL); | |
612 | if (!buffer) | |
613 | return -ENOMEM; | |
614 | ||
615 | rv = usb_control_msg(data->usb_dev, | |
616 | usb_rcvctrlpipe(data->usb_dev, 0), | |
617 | USBTMC_REQUEST_INITIATE_CLEAR, | |
618 | USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE, | |
619 | 0, 0, buffer, 1, USBTMC_TIMEOUT); | |
620 | if (rv < 0) { | |
621 | dev_err(dev, "usb_control_msg returned %d\n", rv); | |
622 | goto exit; | |
623 | } | |
624 | ||
625 | dev_dbg(dev, "INITIATE_CLEAR returned %x\n", buffer[0]); | |
626 | ||
627 | if (buffer[0] != USBTMC_STATUS_SUCCESS) { | |
628 | dev_err(dev, "INITIATE_CLEAR returned %x\n", buffer[0]); | |
629 | rv = -EPERM; | |
630 | goto exit; | |
631 | } | |
632 | ||
633 | max_size = 0; | |
634 | current_setting = data->intf->cur_altsetting; | |
635 | for (n = 0; n < current_setting->desc.bNumEndpoints; n++) { | |
636 | desc = ¤t_setting->endpoint[n].desc; | |
637 | if (desc->bEndpointAddress == data->bulk_in) | |
29cc8897 | 638 | max_size = usb_endpoint_maxp(desc); |
5b775f67 GKH |
639 | } |
640 | ||
641 | if (max_size == 0) { | |
642 | dev_err(dev, "Couldn't get wMaxPacketSize\n"); | |
643 | rv = -EPERM; | |
644 | goto exit; | |
645 | } | |
646 | ||
647 | dev_dbg(dev, "wMaxPacketSize is %d\n", max_size); | |
648 | ||
649 | n = 0; | |
650 | ||
651 | usbtmc_clear_check_status: | |
652 | ||
653 | dev_dbg(dev, "Sending CHECK_CLEAR_STATUS request\n"); | |
654 | ||
655 | rv = usb_control_msg(data->usb_dev, | |
656 | usb_rcvctrlpipe(data->usb_dev, 0), | |
657 | USBTMC_REQUEST_CHECK_CLEAR_STATUS, | |
658 | USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE, | |
659 | 0, 0, buffer, 2, USBTMC_TIMEOUT); | |
660 | if (rv < 0) { | |
661 | dev_err(dev, "usb_control_msg returned %d\n", rv); | |
662 | goto exit; | |
663 | } | |
664 | ||
665 | dev_dbg(dev, "CHECK_CLEAR_STATUS returned %x\n", buffer[0]); | |
666 | ||
667 | if (buffer[0] == USBTMC_STATUS_SUCCESS) | |
668 | goto usbtmc_clear_bulk_out_halt; | |
669 | ||
670 | if (buffer[0] != USBTMC_STATUS_PENDING) { | |
671 | dev_err(dev, "CHECK_CLEAR_STATUS returned %x\n", buffer[0]); | |
672 | rv = -EPERM; | |
673 | goto exit; | |
674 | } | |
675 | ||
676 | if (buffer[1] == 1) | |
677 | do { | |
678 | dev_dbg(dev, "Reading from bulk in EP\n"); | |
679 | ||
680 | rv = usb_bulk_msg(data->usb_dev, | |
681 | usb_rcvbulkpipe(data->usb_dev, | |
682 | data->bulk_in), | |
683 | buffer, USBTMC_SIZE_IOBUFFER, | |
684 | &actual, USBTMC_TIMEOUT); | |
685 | n++; | |
686 | ||
687 | if (rv < 0) { | |
688 | dev_err(dev, "usb_control_msg returned %d\n", | |
689 | rv); | |
690 | goto exit; | |
691 | } | |
692 | } while ((actual == max_size) && | |
693 | (n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN)); | |
694 | ||
695 | if (actual == max_size) { | |
696 | dev_err(dev, "Couldn't clear device buffer within %d cycles\n", | |
697 | USBTMC_MAX_READS_TO_CLEAR_BULK_IN); | |
698 | rv = -EPERM; | |
699 | goto exit; | |
700 | } | |
701 | ||
702 | goto usbtmc_clear_check_status; | |
703 | ||
704 | usbtmc_clear_bulk_out_halt: | |
705 | ||
3342ecda SS |
706 | rv = usb_clear_halt(data->usb_dev, |
707 | usb_sndbulkpipe(data->usb_dev, data->bulk_out)); | |
5b775f67 GKH |
708 | if (rv < 0) { |
709 | dev_err(dev, "usb_control_msg returned %d\n", rv); | |
710 | goto exit; | |
711 | } | |
712 | rv = 0; | |
713 | ||
714 | exit: | |
715 | kfree(buffer); | |
716 | return rv; | |
717 | } | |
718 | ||
719 | static int usbtmc_ioctl_clear_out_halt(struct usbtmc_device_data *data) | |
720 | { | |
721 | u8 *buffer; | |
722 | int rv; | |
723 | ||
724 | buffer = kmalloc(2, GFP_KERNEL); | |
725 | if (!buffer) | |
726 | return -ENOMEM; | |
727 | ||
3342ecda SS |
728 | rv = usb_clear_halt(data->usb_dev, |
729 | usb_sndbulkpipe(data->usb_dev, data->bulk_out)); | |
5b775f67 GKH |
730 | |
731 | if (rv < 0) { | |
732 | dev_err(&data->usb_dev->dev, "usb_control_msg returned %d\n", | |
733 | rv); | |
734 | goto exit; | |
735 | } | |
736 | rv = 0; | |
737 | ||
738 | exit: | |
739 | kfree(buffer); | |
740 | return rv; | |
741 | } | |
742 | ||
743 | static int usbtmc_ioctl_clear_in_halt(struct usbtmc_device_data *data) | |
744 | { | |
745 | u8 *buffer; | |
746 | int rv; | |
747 | ||
748 | buffer = kmalloc(2, GFP_KERNEL); | |
749 | if (!buffer) | |
750 | return -ENOMEM; | |
751 | ||
3342ecda SS |
752 | rv = usb_clear_halt(data->usb_dev, |
753 | usb_rcvbulkpipe(data->usb_dev, data->bulk_in)); | |
5b775f67 GKH |
754 | |
755 | if (rv < 0) { | |
756 | dev_err(&data->usb_dev->dev, "usb_control_msg returned %d\n", | |
757 | rv); | |
758 | goto exit; | |
759 | } | |
760 | rv = 0; | |
761 | ||
762 | exit: | |
763 | kfree(buffer); | |
764 | return rv; | |
765 | } | |
766 | ||
767 | static int get_capabilities(struct usbtmc_device_data *data) | |
768 | { | |
769 | struct device *dev = &data->usb_dev->dev; | |
770 | char *buffer; | |
ca157c4a | 771 | int rv = 0; |
5b775f67 GKH |
772 | |
773 | buffer = kmalloc(0x18, GFP_KERNEL); | |
774 | if (!buffer) | |
775 | return -ENOMEM; | |
776 | ||
777 | rv = usb_control_msg(data->usb_dev, usb_rcvctrlpipe(data->usb_dev, 0), | |
778 | USBTMC_REQUEST_GET_CAPABILITIES, | |
779 | USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE, | |
780 | 0, 0, buffer, 0x18, USBTMC_TIMEOUT); | |
781 | if (rv < 0) { | |
782 | dev_err(dev, "usb_control_msg returned %d\n", rv); | |
ca157c4a | 783 | goto err_out; |
5b775f67 GKH |
784 | } |
785 | ||
786 | dev_dbg(dev, "GET_CAPABILITIES returned %x\n", buffer[0]); | |
5b775f67 GKH |
787 | if (buffer[0] != USBTMC_STATUS_SUCCESS) { |
788 | dev_err(dev, "GET_CAPABILITIES returned %x\n", buffer[0]); | |
ca157c4a ON |
789 | rv = -EPERM; |
790 | goto err_out; | |
5b775f67 | 791 | } |
d0a38365 GI |
792 | dev_dbg(dev, "Interface capabilities are %x\n", buffer[4]); |
793 | dev_dbg(dev, "Device capabilities are %x\n", buffer[5]); | |
794 | dev_dbg(dev, "USB488 interface capabilities are %x\n", buffer[14]); | |
795 | dev_dbg(dev, "USB488 device capabilities are %x\n", buffer[15]); | |
5b775f67 GKH |
796 | |
797 | data->capabilities.interface_capabilities = buffer[4]; | |
798 | data->capabilities.device_capabilities = buffer[5]; | |
799 | data->capabilities.usb488_interface_capabilities = buffer[14]; | |
800 | data->capabilities.usb488_device_capabilities = buffer[15]; | |
d0a38365 | 801 | rv = 0; |
5b775f67 | 802 | |
ca157c4a | 803 | err_out: |
5b775f67 | 804 | kfree(buffer); |
ca157c4a | 805 | return rv; |
5b775f67 GKH |
806 | } |
807 | ||
808 | #define capability_attribute(name) \ | |
809 | static ssize_t show_##name(struct device *dev, \ | |
810 | struct device_attribute *attr, char *buf) \ | |
811 | { \ | |
812 | struct usb_interface *intf = to_usb_interface(dev); \ | |
813 | struct usbtmc_device_data *data = usb_get_intfdata(intf); \ | |
814 | \ | |
815 | return sprintf(buf, "%d\n", data->capabilities.name); \ | |
816 | } \ | |
817 | static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL) | |
818 | ||
819 | capability_attribute(interface_capabilities); | |
820 | capability_attribute(device_capabilities); | |
821 | capability_attribute(usb488_interface_capabilities); | |
822 | capability_attribute(usb488_device_capabilities); | |
823 | ||
824 | static struct attribute *capability_attrs[] = { | |
825 | &dev_attr_interface_capabilities.attr, | |
826 | &dev_attr_device_capabilities.attr, | |
827 | &dev_attr_usb488_interface_capabilities.attr, | |
828 | &dev_attr_usb488_device_capabilities.attr, | |
829 | NULL, | |
830 | }; | |
831 | ||
832 | static struct attribute_group capability_attr_grp = { | |
833 | .attrs = capability_attrs, | |
834 | }; | |
835 | ||
836 | static ssize_t show_TermChar(struct device *dev, | |
837 | struct device_attribute *attr, char *buf) | |
838 | { | |
839 | struct usb_interface *intf = to_usb_interface(dev); | |
840 | struct usbtmc_device_data *data = usb_get_intfdata(intf); | |
841 | ||
842 | return sprintf(buf, "%c\n", data->TermChar); | |
843 | } | |
844 | ||
845 | static ssize_t store_TermChar(struct device *dev, | |
846 | struct device_attribute *attr, | |
847 | const char *buf, size_t count) | |
848 | { | |
849 | struct usb_interface *intf = to_usb_interface(dev); | |
850 | struct usbtmc_device_data *data = usb_get_intfdata(intf); | |
851 | ||
852 | if (count < 1) | |
853 | return -EINVAL; | |
854 | data->TermChar = buf[0]; | |
855 | return count; | |
856 | } | |
857 | static DEVICE_ATTR(TermChar, S_IRUGO, show_TermChar, store_TermChar); | |
858 | ||
859 | #define data_attribute(name) \ | |
860 | static ssize_t show_##name(struct device *dev, \ | |
861 | struct device_attribute *attr, char *buf) \ | |
862 | { \ | |
863 | struct usb_interface *intf = to_usb_interface(dev); \ | |
864 | struct usbtmc_device_data *data = usb_get_intfdata(intf); \ | |
865 | \ | |
866 | return sprintf(buf, "%d\n", data->name); \ | |
867 | } \ | |
868 | static ssize_t store_##name(struct device *dev, \ | |
869 | struct device_attribute *attr, \ | |
870 | const char *buf, size_t count) \ | |
871 | { \ | |
872 | struct usb_interface *intf = to_usb_interface(dev); \ | |
873 | struct usbtmc_device_data *data = usb_get_intfdata(intf); \ | |
874 | ssize_t result; \ | |
875 | unsigned val; \ | |
876 | \ | |
877 | result = sscanf(buf, "%u\n", &val); \ | |
878 | if (result != 1) \ | |
879 | result = -EINVAL; \ | |
880 | data->name = val; \ | |
881 | if (result < 0) \ | |
882 | return result; \ | |
883 | else \ | |
884 | return count; \ | |
885 | } \ | |
886 | static DEVICE_ATTR(name, S_IRUGO, show_##name, store_##name) | |
887 | ||
888 | data_attribute(TermCharEnabled); | |
889 | data_attribute(auto_abort); | |
890 | ||
891 | static struct attribute *data_attrs[] = { | |
892 | &dev_attr_TermChar.attr, | |
893 | &dev_attr_TermCharEnabled.attr, | |
894 | &dev_attr_auto_abort.attr, | |
895 | NULL, | |
896 | }; | |
897 | ||
898 | static struct attribute_group data_attr_grp = { | |
899 | .attrs = data_attrs, | |
900 | }; | |
901 | ||
902 | static int usbtmc_ioctl_indicator_pulse(struct usbtmc_device_data *data) | |
903 | { | |
904 | struct device *dev; | |
905 | u8 *buffer; | |
906 | int rv; | |
907 | ||
908 | dev = &data->intf->dev; | |
909 | ||
910 | buffer = kmalloc(2, GFP_KERNEL); | |
911 | if (!buffer) | |
912 | return -ENOMEM; | |
913 | ||
914 | rv = usb_control_msg(data->usb_dev, | |
915 | usb_rcvctrlpipe(data->usb_dev, 0), | |
916 | USBTMC_REQUEST_INDICATOR_PULSE, | |
917 | USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE, | |
918 | 0, 0, buffer, 0x01, USBTMC_TIMEOUT); | |
919 | ||
920 | if (rv < 0) { | |
921 | dev_err(dev, "usb_control_msg returned %d\n", rv); | |
922 | goto exit; | |
923 | } | |
924 | ||
925 | dev_dbg(dev, "INDICATOR_PULSE returned %x\n", buffer[0]); | |
926 | ||
927 | if (buffer[0] != USBTMC_STATUS_SUCCESS) { | |
928 | dev_err(dev, "INDICATOR_PULSE returned %x\n", buffer[0]); | |
929 | rv = -EPERM; | |
930 | goto exit; | |
931 | } | |
932 | rv = 0; | |
933 | ||
934 | exit: | |
935 | kfree(buffer); | |
936 | return rv; | |
937 | } | |
938 | ||
939 | static long usbtmc_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
940 | { | |
941 | struct usbtmc_device_data *data; | |
942 | int retval = -EBADRQC; | |
943 | ||
944 | data = file->private_data; | |
945 | mutex_lock(&data->io_mutex); | |
86286883 ON |
946 | if (data->zombie) { |
947 | retval = -ENODEV; | |
948 | goto skip_io_on_zombie; | |
949 | } | |
5b775f67 GKH |
950 | |
951 | switch (cmd) { | |
952 | case USBTMC_IOCTL_CLEAR_OUT_HALT: | |
953 | retval = usbtmc_ioctl_clear_out_halt(data); | |
a92b63e7 | 954 | break; |
5b775f67 GKH |
955 | |
956 | case USBTMC_IOCTL_CLEAR_IN_HALT: | |
957 | retval = usbtmc_ioctl_clear_in_halt(data); | |
a92b63e7 | 958 | break; |
5b775f67 GKH |
959 | |
960 | case USBTMC_IOCTL_INDICATOR_PULSE: | |
961 | retval = usbtmc_ioctl_indicator_pulse(data); | |
a92b63e7 | 962 | break; |
5b775f67 GKH |
963 | |
964 | case USBTMC_IOCTL_CLEAR: | |
965 | retval = usbtmc_ioctl_clear(data); | |
a92b63e7 | 966 | break; |
5b775f67 GKH |
967 | |
968 | case USBTMC_IOCTL_ABORT_BULK_OUT: | |
969 | retval = usbtmc_ioctl_abort_bulk_out(data); | |
a92b63e7 | 970 | break; |
5b775f67 GKH |
971 | |
972 | case USBTMC_IOCTL_ABORT_BULK_IN: | |
973 | retval = usbtmc_ioctl_abort_bulk_in(data); | |
a92b63e7 | 974 | break; |
5b775f67 GKH |
975 | } |
976 | ||
86286883 | 977 | skip_io_on_zombie: |
5b775f67 GKH |
978 | mutex_unlock(&data->io_mutex); |
979 | return retval; | |
980 | } | |
981 | ||
828c0950 | 982 | static const struct file_operations fops = { |
5b775f67 GKH |
983 | .owner = THIS_MODULE, |
984 | .read = usbtmc_read, | |
985 | .write = usbtmc_write, | |
986 | .open = usbtmc_open, | |
987 | .release = usbtmc_release, | |
988 | .unlocked_ioctl = usbtmc_ioctl, | |
6038f373 | 989 | .llseek = default_llseek, |
5b775f67 GKH |
990 | }; |
991 | ||
992 | static struct usb_class_driver usbtmc_class = { | |
993 | .name = "usbtmc%d", | |
994 | .fops = &fops, | |
995 | .minor_base = USBTMC_MINOR_BASE, | |
996 | }; | |
997 | ||
998 | ||
999 | static int usbtmc_probe(struct usb_interface *intf, | |
1000 | const struct usb_device_id *id) | |
1001 | { | |
1002 | struct usbtmc_device_data *data; | |
1003 | struct usb_host_interface *iface_desc; | |
1004 | struct usb_endpoint_descriptor *endpoint; | |
1005 | int n; | |
1006 | int retcode; | |
1007 | ||
1008 | dev_dbg(&intf->dev, "%s called\n", __func__); | |
1009 | ||
1010 | data = kmalloc(sizeof(struct usbtmc_device_data), GFP_KERNEL); | |
1011 | if (!data) { | |
1012 | dev_err(&intf->dev, "Unable to allocate kernel memory\n"); | |
1013 | return -ENOMEM; | |
1014 | } | |
1015 | ||
1016 | data->intf = intf; | |
1017 | data->id = id; | |
1018 | data->usb_dev = usb_get_dev(interface_to_usbdev(intf)); | |
1019 | usb_set_intfdata(intf, data); | |
1020 | kref_init(&data->kref); | |
1021 | mutex_init(&data->io_mutex); | |
86286883 | 1022 | data->zombie = 0; |
5b775f67 GKH |
1023 | |
1024 | /* Initialize USBTMC bTag and other fields */ | |
1025 | data->bTag = 1; | |
1026 | data->TermCharEnabled = 0; | |
1027 | data->TermChar = '\n'; | |
1028 | ||
1029 | /* USBTMC devices have only one setting, so use that */ | |
1030 | iface_desc = data->intf->cur_altsetting; | |
1031 | ||
1032 | /* Find bulk in endpoint */ | |
1033 | for (n = 0; n < iface_desc->desc.bNumEndpoints; n++) { | |
1034 | endpoint = &iface_desc->endpoint[n].desc; | |
1035 | ||
1036 | if (usb_endpoint_is_bulk_in(endpoint)) { | |
1037 | data->bulk_in = endpoint->bEndpointAddress; | |
1038 | dev_dbg(&intf->dev, "Found bulk in endpoint at %u\n", | |
1039 | data->bulk_in); | |
1040 | break; | |
1041 | } | |
1042 | } | |
1043 | ||
1044 | /* Find bulk out endpoint */ | |
1045 | for (n = 0; n < iface_desc->desc.bNumEndpoints; n++) { | |
1046 | endpoint = &iface_desc->endpoint[n].desc; | |
1047 | ||
1048 | if (usb_endpoint_is_bulk_out(endpoint)) { | |
1049 | data->bulk_out = endpoint->bEndpointAddress; | |
1050 | dev_dbg(&intf->dev, "Found Bulk out endpoint at %u\n", | |
1051 | data->bulk_out); | |
1052 | break; | |
1053 | } | |
1054 | } | |
1055 | ||
1056 | retcode = get_capabilities(data); | |
1057 | if (retcode) | |
1058 | dev_err(&intf->dev, "can't read capabilities\n"); | |
1059 | else | |
1060 | retcode = sysfs_create_group(&intf->dev.kobj, | |
1061 | &capability_attr_grp); | |
1062 | ||
1063 | retcode = sysfs_create_group(&intf->dev.kobj, &data_attr_grp); | |
1064 | ||
1065 | retcode = usb_register_dev(intf, &usbtmc_class); | |
1066 | if (retcode) { | |
1067 | dev_err(&intf->dev, "Not able to get a minor" | |
1068 | " (base %u, slice default): %d\n", USBTMC_MINOR_BASE, | |
1069 | retcode); | |
1070 | goto error_register; | |
1071 | } | |
1072 | dev_dbg(&intf->dev, "Using minor number %d\n", intf->minor); | |
1073 | ||
1074 | return 0; | |
1075 | ||
1076 | error_register: | |
1077 | sysfs_remove_group(&intf->dev.kobj, &capability_attr_grp); | |
1078 | sysfs_remove_group(&intf->dev.kobj, &data_attr_grp); | |
1079 | kref_put(&data->kref, usbtmc_delete); | |
1080 | return retcode; | |
1081 | } | |
1082 | ||
1083 | static void usbtmc_disconnect(struct usb_interface *intf) | |
1084 | { | |
1085 | struct usbtmc_device_data *data; | |
1086 | ||
1087 | dev_dbg(&intf->dev, "usbtmc_disconnect called\n"); | |
1088 | ||
1089 | data = usb_get_intfdata(intf); | |
1090 | usb_deregister_dev(intf, &usbtmc_class); | |
1091 | sysfs_remove_group(&intf->dev.kobj, &capability_attr_grp); | |
1092 | sysfs_remove_group(&intf->dev.kobj, &data_attr_grp); | |
86286883 ON |
1093 | mutex_lock(&data->io_mutex); |
1094 | data->zombie = 1; | |
1095 | mutex_unlock(&data->io_mutex); | |
5b775f67 GKH |
1096 | kref_put(&data->kref, usbtmc_delete); |
1097 | } | |
1098 | ||
dca8cd04 | 1099 | static int usbtmc_suspend(struct usb_interface *intf, pm_message_t message) |
a4708103 ON |
1100 | { |
1101 | /* this driver does not have pending URBs */ | |
1102 | return 0; | |
1103 | } | |
1104 | ||
dca8cd04 | 1105 | static int usbtmc_resume(struct usb_interface *intf) |
a4708103 ON |
1106 | { |
1107 | return 0; | |
1108 | } | |
1109 | ||
5b775f67 GKH |
1110 | static struct usb_driver usbtmc_driver = { |
1111 | .name = "usbtmc", | |
1112 | .id_table = usbtmc_devices, | |
1113 | .probe = usbtmc_probe, | |
a4708103 ON |
1114 | .disconnect = usbtmc_disconnect, |
1115 | .suspend = usbtmc_suspend, | |
1116 | .resume = usbtmc_resume, | |
5b775f67 GKH |
1117 | }; |
1118 | ||
1119 | static int __init usbtmc_init(void) | |
1120 | { | |
1121 | int retcode; | |
1122 | ||
1123 | retcode = usb_register(&usbtmc_driver); | |
1124 | if (retcode) | |
1125 | printk(KERN_ERR KBUILD_MODNAME": Unable to register driver\n"); | |
1126 | return retcode; | |
1127 | } | |
1128 | module_init(usbtmc_init); | |
1129 | ||
1130 | static void __exit usbtmc_exit(void) | |
1131 | { | |
1132 | usb_deregister(&usbtmc_driver); | |
1133 | } | |
1134 | module_exit(usbtmc_exit); | |
1135 | ||
1136 | MODULE_LICENSE("GPL"); |