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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 | ||
8402db5d APF |
34 | #define RIGOL 1 |
35 | #define USBTMC_HEADER_SIZE 12 | |
5b775f67 GKH |
36 | #define USBTMC_MINOR_BASE 176 |
37 | ||
38 | /* | |
39 | * Size of driver internal IO buffer. Must be multiple of 4 and at least as | |
40 | * large as wMaxPacketSize (which is usually 512 bytes). | |
41 | */ | |
42 | #define USBTMC_SIZE_IOBUFFER 2048 | |
43 | ||
44 | /* Default USB timeout (in milliseconds) */ | |
35f76e89 | 45 | #define USBTMC_TIMEOUT 5000 |
5b775f67 GKH |
46 | |
47 | /* | |
48 | * Maximum number of read cycles to empty bulk in endpoint during CLEAR and | |
49 | * ABORT_BULK_IN requests. Ends the loop if (for whatever reason) a short | |
50 | * packet is never read. | |
51 | */ | |
52 | #define USBTMC_MAX_READS_TO_CLEAR_BULK_IN 100 | |
53 | ||
6ef4852b | 54 | static const struct usb_device_id usbtmc_devices[] = { |
5b775f67 | 55 | { USB_INTERFACE_INFO(USB_CLASS_APP_SPEC, 3, 0), }, |
228dd05d | 56 | { USB_INTERFACE_INFO(USB_CLASS_APP_SPEC, 3, 1), }, |
5b775f67 GKH |
57 | { 0, } /* terminating entry */ |
58 | }; | |
5413aa46 | 59 | MODULE_DEVICE_TABLE(usb, usbtmc_devices); |
5b775f67 GKH |
60 | |
61 | /* | |
62 | * This structure is the capabilities for the device | |
d0a38365 GI |
63 | * See section 4.2.1.8 of the USBTMC specification, |
64 | * and section 4.2.2 of the USBTMC usb488 subclass | |
65 | * specification for details. | |
5b775f67 GKH |
66 | */ |
67 | struct usbtmc_dev_capabilities { | |
68 | __u8 interface_capabilities; | |
69 | __u8 device_capabilities; | |
70 | __u8 usb488_interface_capabilities; | |
71 | __u8 usb488_device_capabilities; | |
72 | }; | |
73 | ||
74 | /* This structure holds private data for each USBTMC device. One copy is | |
75 | * allocated for each USBTMC device in the driver's probe function. | |
76 | */ | |
77 | struct usbtmc_device_data { | |
78 | const struct usb_device_id *id; | |
79 | struct usb_device *usb_dev; | |
80 | struct usb_interface *intf; | |
81 | ||
82 | unsigned int bulk_in; | |
83 | unsigned int bulk_out; | |
84 | ||
85 | u8 bTag; | |
86 | u8 bTag_last_write; /* needed for abort */ | |
87 | u8 bTag_last_read; /* needed for abort */ | |
88 | ||
8402db5d APF |
89 | u8 rigol_quirk; |
90 | ||
5b775f67 GKH |
91 | /* attributes from the USB TMC spec for this device */ |
92 | u8 TermChar; | |
93 | bool TermCharEnabled; | |
94 | bool auto_abort; | |
95 | ||
86286883 ON |
96 | bool zombie; /* fd of disconnected device */ |
97 | ||
5b775f67 GKH |
98 | struct usbtmc_dev_capabilities capabilities; |
99 | struct kref kref; | |
100 | struct mutex io_mutex; /* only one i/o function running at a time */ | |
101 | }; | |
102 | #define to_usbtmc_data(d) container_of(d, struct usbtmc_device_data, kref) | |
103 | ||
8402db5d APF |
104 | struct usbtmc_ID_rigol_quirk { |
105 | __u16 idVendor; | |
106 | __u16 idProduct; | |
107 | }; | |
108 | ||
109 | static const struct usbtmc_ID_rigol_quirk usbtmc_id_quirk[] = { | |
110 | { 0x1ab1, 0x0588 }, | |
111 | { 0, 0 } | |
112 | }; | |
113 | ||
5b775f67 GKH |
114 | /* Forward declarations */ |
115 | static struct usb_driver usbtmc_driver; | |
116 | ||
117 | static void usbtmc_delete(struct kref *kref) | |
118 | { | |
119 | struct usbtmc_device_data *data = to_usbtmc_data(kref); | |
120 | ||
121 | usb_put_dev(data->usb_dev); | |
122 | kfree(data); | |
123 | } | |
124 | ||
125 | static int usbtmc_open(struct inode *inode, struct file *filp) | |
126 | { | |
127 | struct usb_interface *intf; | |
128 | struct usbtmc_device_data *data; | |
5b10916e | 129 | int retval = 0; |
5b775f67 GKH |
130 | |
131 | intf = usb_find_interface(&usbtmc_driver, iminor(inode)); | |
132 | if (!intf) { | |
133 | printk(KERN_ERR KBUILD_MODNAME | |
134 | ": can not find device for minor %d", iminor(inode)); | |
5b10916e | 135 | retval = -ENODEV; |
5b775f67 GKH |
136 | goto exit; |
137 | } | |
138 | ||
139 | data = usb_get_intfdata(intf); | |
140 | kref_get(&data->kref); | |
141 | ||
142 | /* Store pointer in file structure's private data field */ | |
143 | filp->private_data = data; | |
144 | ||
145 | exit: | |
146 | return retval; | |
147 | } | |
148 | ||
149 | static int usbtmc_release(struct inode *inode, struct file *file) | |
150 | { | |
151 | struct usbtmc_device_data *data = file->private_data; | |
152 | ||
153 | kref_put(&data->kref, usbtmc_delete); | |
154 | return 0; | |
155 | } | |
156 | ||
157 | static int usbtmc_ioctl_abort_bulk_in(struct usbtmc_device_data *data) | |
158 | { | |
b361a6e3 | 159 | u8 *buffer; |
5b775f67 GKH |
160 | struct device *dev; |
161 | int rv; | |
162 | int n; | |
163 | int actual; | |
164 | struct usb_host_interface *current_setting; | |
165 | int max_size; | |
166 | ||
167 | dev = &data->intf->dev; | |
168 | buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL); | |
169 | if (!buffer) | |
170 | return -ENOMEM; | |
171 | ||
172 | rv = usb_control_msg(data->usb_dev, | |
173 | usb_rcvctrlpipe(data->usb_dev, 0), | |
174 | USBTMC_REQUEST_INITIATE_ABORT_BULK_IN, | |
175 | USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT, | |
176 | data->bTag_last_read, data->bulk_in, | |
177 | buffer, 2, USBTMC_TIMEOUT); | |
178 | ||
179 | if (rv < 0) { | |
180 | dev_err(dev, "usb_control_msg returned %d\n", rv); | |
181 | goto exit; | |
182 | } | |
183 | ||
184 | dev_dbg(dev, "INITIATE_ABORT_BULK_IN returned %x\n", buffer[0]); | |
185 | ||
186 | if (buffer[0] == USBTMC_STATUS_FAILED) { | |
187 | rv = 0; | |
188 | goto exit; | |
189 | } | |
190 | ||
191 | if (buffer[0] != USBTMC_STATUS_SUCCESS) { | |
192 | dev_err(dev, "INITIATE_ABORT_BULK_IN returned %x\n", | |
193 | buffer[0]); | |
194 | rv = -EPERM; | |
195 | goto exit; | |
196 | } | |
197 | ||
198 | max_size = 0; | |
199 | current_setting = data->intf->cur_altsetting; | |
200 | for (n = 0; n < current_setting->desc.bNumEndpoints; n++) | |
201 | if (current_setting->endpoint[n].desc.bEndpointAddress == | |
202 | data->bulk_in) | |
29cc8897 | 203 | max_size = usb_endpoint_maxp(¤t_setting->endpoint[n].desc); |
5b775f67 GKH |
204 | |
205 | if (max_size == 0) { | |
206 | dev_err(dev, "Couldn't get wMaxPacketSize\n"); | |
207 | rv = -EPERM; | |
208 | goto exit; | |
209 | } | |
210 | ||
211 | dev_dbg(&data->intf->dev, "wMaxPacketSize is %d\n", max_size); | |
212 | ||
213 | n = 0; | |
214 | ||
215 | do { | |
216 | dev_dbg(dev, "Reading from bulk in EP\n"); | |
217 | ||
218 | rv = usb_bulk_msg(data->usb_dev, | |
219 | usb_rcvbulkpipe(data->usb_dev, | |
220 | data->bulk_in), | |
221 | buffer, USBTMC_SIZE_IOBUFFER, | |
222 | &actual, USBTMC_TIMEOUT); | |
223 | ||
224 | n++; | |
225 | ||
226 | if (rv < 0) { | |
227 | dev_err(dev, "usb_bulk_msg returned %d\n", rv); | |
228 | goto exit; | |
229 | } | |
230 | } while ((actual == max_size) && | |
231 | (n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN)); | |
232 | ||
233 | if (actual == max_size) { | |
234 | dev_err(dev, "Couldn't clear device buffer within %d cycles\n", | |
235 | USBTMC_MAX_READS_TO_CLEAR_BULK_IN); | |
236 | rv = -EPERM; | |
237 | goto exit; | |
238 | } | |
239 | ||
240 | n = 0; | |
241 | ||
242 | usbtmc_abort_bulk_in_status: | |
243 | rv = usb_control_msg(data->usb_dev, | |
244 | usb_rcvctrlpipe(data->usb_dev, 0), | |
245 | USBTMC_REQUEST_CHECK_ABORT_BULK_IN_STATUS, | |
246 | USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT, | |
247 | 0, data->bulk_in, buffer, 0x08, | |
248 | USBTMC_TIMEOUT); | |
249 | ||
250 | if (rv < 0) { | |
251 | dev_err(dev, "usb_control_msg returned %d\n", rv); | |
252 | goto exit; | |
253 | } | |
254 | ||
255 | dev_dbg(dev, "INITIATE_ABORT_BULK_IN returned %x\n", buffer[0]); | |
256 | ||
257 | if (buffer[0] == USBTMC_STATUS_SUCCESS) { | |
258 | rv = 0; | |
259 | goto exit; | |
260 | } | |
261 | ||
262 | if (buffer[0] != USBTMC_STATUS_PENDING) { | |
263 | dev_err(dev, "INITIATE_ABORT_BULK_IN returned %x\n", buffer[0]); | |
264 | rv = -EPERM; | |
265 | goto exit; | |
266 | } | |
267 | ||
268 | if (buffer[1] == 1) | |
269 | do { | |
270 | dev_dbg(dev, "Reading from bulk in EP\n"); | |
271 | ||
272 | rv = usb_bulk_msg(data->usb_dev, | |
273 | usb_rcvbulkpipe(data->usb_dev, | |
274 | data->bulk_in), | |
275 | buffer, USBTMC_SIZE_IOBUFFER, | |
276 | &actual, USBTMC_TIMEOUT); | |
277 | ||
278 | n++; | |
279 | ||
280 | if (rv < 0) { | |
281 | dev_err(dev, "usb_bulk_msg returned %d\n", rv); | |
282 | goto exit; | |
283 | } | |
4f1a7a3e | 284 | } while ((actual == max_size) && |
5b775f67 GKH |
285 | (n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN)); |
286 | ||
287 | if (actual == max_size) { | |
288 | dev_err(dev, "Couldn't clear device buffer within %d cycles\n", | |
289 | USBTMC_MAX_READS_TO_CLEAR_BULK_IN); | |
290 | rv = -EPERM; | |
291 | goto exit; | |
292 | } | |
293 | ||
294 | goto usbtmc_abort_bulk_in_status; | |
295 | ||
296 | exit: | |
297 | kfree(buffer); | |
298 | return rv; | |
299 | ||
300 | } | |
301 | ||
302 | static int usbtmc_ioctl_abort_bulk_out(struct usbtmc_device_data *data) | |
303 | { | |
304 | struct device *dev; | |
305 | u8 *buffer; | |
306 | int rv; | |
307 | int n; | |
308 | ||
309 | dev = &data->intf->dev; | |
310 | ||
311 | buffer = kmalloc(8, GFP_KERNEL); | |
312 | if (!buffer) | |
313 | return -ENOMEM; | |
314 | ||
315 | rv = usb_control_msg(data->usb_dev, | |
316 | usb_rcvctrlpipe(data->usb_dev, 0), | |
317 | USBTMC_REQUEST_INITIATE_ABORT_BULK_OUT, | |
318 | USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT, | |
319 | data->bTag_last_write, data->bulk_out, | |
320 | buffer, 2, USBTMC_TIMEOUT); | |
321 | ||
322 | if (rv < 0) { | |
323 | dev_err(dev, "usb_control_msg returned %d\n", rv); | |
324 | goto exit; | |
325 | } | |
326 | ||
327 | dev_dbg(dev, "INITIATE_ABORT_BULK_OUT returned %x\n", buffer[0]); | |
328 | ||
329 | if (buffer[0] != USBTMC_STATUS_SUCCESS) { | |
330 | dev_err(dev, "INITIATE_ABORT_BULK_OUT returned %x\n", | |
331 | buffer[0]); | |
332 | rv = -EPERM; | |
333 | goto exit; | |
334 | } | |
335 | ||
336 | n = 0; | |
337 | ||
338 | usbtmc_abort_bulk_out_check_status: | |
339 | rv = usb_control_msg(data->usb_dev, | |
340 | usb_rcvctrlpipe(data->usb_dev, 0), | |
341 | USBTMC_REQUEST_CHECK_ABORT_BULK_OUT_STATUS, | |
342 | USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT, | |
343 | 0, data->bulk_out, buffer, 0x08, | |
344 | USBTMC_TIMEOUT); | |
345 | n++; | |
346 | if (rv < 0) { | |
347 | dev_err(dev, "usb_control_msg returned %d\n", rv); | |
348 | goto exit; | |
349 | } | |
350 | ||
351 | dev_dbg(dev, "CHECK_ABORT_BULK_OUT returned %x\n", buffer[0]); | |
352 | ||
353 | if (buffer[0] == USBTMC_STATUS_SUCCESS) | |
354 | goto usbtmc_abort_bulk_out_clear_halt; | |
355 | ||
356 | if ((buffer[0] == USBTMC_STATUS_PENDING) && | |
357 | (n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN)) | |
358 | goto usbtmc_abort_bulk_out_check_status; | |
359 | ||
360 | rv = -EPERM; | |
361 | goto exit; | |
362 | ||
363 | usbtmc_abort_bulk_out_clear_halt: | |
3342ecda SS |
364 | rv = usb_clear_halt(data->usb_dev, |
365 | usb_sndbulkpipe(data->usb_dev, data->bulk_out)); | |
5b775f67 GKH |
366 | |
367 | if (rv < 0) { | |
368 | dev_err(dev, "usb_control_msg returned %d\n", rv); | |
369 | goto exit; | |
370 | } | |
371 | rv = 0; | |
372 | ||
373 | exit: | |
374 | kfree(buffer); | |
375 | return rv; | |
376 | } | |
377 | ||
88d9b2b3 APF |
378 | /* |
379 | * Sends a REQUEST_DEV_DEP_MSG_IN message on the Bulk-IN endpoint. | |
380 | * @transfer_size: number of bytes to request from the device. | |
381 | * | |
382 | * See the USBTMC specification, Table 4. | |
383 | * | |
384 | * Also updates bTag_last_write. | |
385 | */ | |
386 | static int send_request_dev_dep_msg_in(struct usbtmc_device_data *data, size_t transfer_size) | |
387 | { | |
388 | int retval; | |
389 | u8 buffer[USBTMC_HEADER_SIZE]; | |
390 | int actual; | |
391 | ||
392 | /* Setup IO buffer for REQUEST_DEV_DEP_MSG_IN message | |
393 | * Refer to class specs for details | |
394 | */ | |
395 | buffer[0] = 2; | |
396 | buffer[1] = data->bTag; | |
397 | buffer[2] = ~(data->bTag); | |
398 | buffer[3] = 0; /* Reserved */ | |
399 | buffer[4] = (transfer_size) & 255; | |
400 | buffer[5] = ((transfer_size) >> 8) & 255; | |
401 | buffer[6] = ((transfer_size) >> 16) & 255; | |
402 | buffer[7] = ((transfer_size) >> 24) & 255; | |
403 | buffer[8] = data->TermCharEnabled * 2; | |
404 | /* Use term character? */ | |
405 | buffer[9] = data->TermChar; | |
406 | buffer[10] = 0; /* Reserved */ | |
407 | buffer[11] = 0; /* Reserved */ | |
408 | ||
409 | /* Send bulk URB */ | |
410 | retval = usb_bulk_msg(data->usb_dev, | |
411 | usb_sndbulkpipe(data->usb_dev, | |
412 | data->bulk_out), | |
413 | buffer, USBTMC_HEADER_SIZE, &actual, USBTMC_TIMEOUT); | |
414 | ||
415 | /* Store bTag (in case we need to abort) */ | |
416 | data->bTag_last_write = data->bTag; | |
417 | ||
418 | /* Increment bTag -- and increment again if zero */ | |
419 | data->bTag++; | |
420 | if (!data->bTag) | |
421 | (data->bTag)++; | |
422 | ||
423 | if (retval < 0) { | |
424 | dev_err(&data->intf->dev, "usb_bulk_msg in send_request_dev_dep_msg_in() returned %d\n", retval); | |
425 | return retval; | |
426 | } | |
427 | ||
428 | return 0; | |
429 | } | |
430 | ||
5b775f67 GKH |
431 | static ssize_t usbtmc_read(struct file *filp, char __user *buf, |
432 | size_t count, loff_t *f_pos) | |
433 | { | |
434 | struct usbtmc_device_data *data; | |
435 | struct device *dev; | |
665d7662 | 436 | u32 n_characters; |
5b775f67 GKH |
437 | u8 *buffer; |
438 | int actual; | |
665d7662 GS |
439 | size_t done; |
440 | size_t remaining; | |
5b775f67 | 441 | int retval; |
665d7662 | 442 | size_t this_part; |
5b775f67 GKH |
443 | |
444 | /* Get pointer to private data structure */ | |
445 | data = filp->private_data; | |
446 | dev = &data->intf->dev; | |
447 | ||
448 | buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL); | |
449 | if (!buffer) | |
450 | return -ENOMEM; | |
451 | ||
452 | mutex_lock(&data->io_mutex); | |
86286883 ON |
453 | if (data->zombie) { |
454 | retval = -ENODEV; | |
455 | goto exit; | |
456 | } | |
5b775f67 | 457 | |
d2ddce37 APF |
458 | if (data->rigol_quirk) { |
459 | dev_dbg(dev, "usb_bulk_msg_in: count(%zu)\n", count); | |
460 | ||
461 | retval = send_request_dev_dep_msg_in(data, count); | |
462 | ||
463 | if (retval < 0) { | |
464 | if (data->auto_abort) | |
465 | usbtmc_ioctl_abort_bulk_out(data); | |
466 | goto exit; | |
467 | } | |
468 | } | |
469 | ||
470 | /* Loop until we have fetched everything we requested */ | |
5b775f67 | 471 | remaining = count; |
d2ddce37 | 472 | this_part = remaining; |
5b775f67 GKH |
473 | done = 0; |
474 | ||
475 | while (remaining > 0) { | |
d2ddce37 APF |
476 | if (!(data->rigol_quirk)) { |
477 | dev_dbg(dev, "usb_bulk_msg_in: remaining(%zu), count(%zu)\n", remaining, count); | |
478 | ||
479 | if (remaining > USBTMC_SIZE_IOBUFFER - USBTMC_HEADER_SIZE - 3) | |
480 | this_part = USBTMC_SIZE_IOBUFFER - USBTMC_HEADER_SIZE - 3; | |
481 | else | |
482 | this_part = remaining; | |
5b775f67 | 483 | |
88d9b2b3 | 484 | retval = send_request_dev_dep_msg_in(data, this_part); |
d2ddce37 | 485 | if (retval < 0) { |
5b775f67 | 486 | dev_err(dev, "usb_bulk_msg returned %d\n", retval); |
d2ddce37 APF |
487 | if (data->auto_abort) |
488 | usbtmc_ioctl_abort_bulk_out(data); | |
489 | goto exit; | |
490 | } | |
5b775f67 GKH |
491 | } |
492 | ||
493 | /* Send bulk URB */ | |
494 | retval = usb_bulk_msg(data->usb_dev, | |
495 | usb_rcvbulkpipe(data->usb_dev, | |
496 | data->bulk_in), | |
497 | buffer, USBTMC_SIZE_IOBUFFER, &actual, | |
498 | USBTMC_TIMEOUT); | |
499 | ||
d2ddce37 APF |
500 | dev_dbg(dev, "usb_bulk_msg: retval(%u), done(%zu), remaining(%zu), actual(%d)\n", retval, done, remaining, actual); |
501 | ||
5b775f67 GKH |
502 | /* Store bTag (in case we need to abort) */ |
503 | data->bTag_last_read = data->bTag; | |
504 | ||
505 | if (retval < 0) { | |
d2ddce37 | 506 | dev_dbg(dev, "Unable to read data, error %d\n", retval); |
5b775f67 GKH |
507 | if (data->auto_abort) |
508 | usbtmc_ioctl_abort_bulk_in(data); | |
509 | goto exit; | |
510 | } | |
511 | ||
d2ddce37 APF |
512 | /* Parse header in first packet */ |
513 | if ((done == 0) || (!(data->rigol_quirk))) { | |
514 | /* Sanity checks for the header */ | |
515 | if (actual < USBTMC_HEADER_SIZE) { | |
516 | dev_err(dev, "Device sent too small first packet: %u < %u\n", actual, USBTMC_HEADER_SIZE); | |
517 | if (data->auto_abort) | |
518 | usbtmc_ioctl_abort_bulk_in(data); | |
519 | goto exit; | |
520 | } | |
5b775f67 | 521 | |
d2ddce37 APF |
522 | if (buffer[0] != 2) { |
523 | dev_err(dev, "Device sent reply with wrong MsgID: %u != 2\n", buffer[0]); | |
524 | if (data->auto_abort) | |
525 | usbtmc_ioctl_abort_bulk_in(data); | |
526 | goto exit; | |
527 | } | |
665d7662 | 528 | |
d2ddce37 APF |
529 | if (buffer[1] != data->bTag_last_write) { |
530 | dev_err(dev, "Device sent reply with wrong bTag: %u != %u\n", buffer[1], data->bTag_last_write); | |
531 | if (data->auto_abort) | |
532 | usbtmc_ioctl_abort_bulk_in(data); | |
533 | goto exit; | |
534 | } | |
665d7662 | 535 | |
d2ddce37 APF |
536 | /* How many characters did the instrument send? */ |
537 | n_characters = buffer[4] + | |
538 | (buffer[5] << 8) + | |
539 | (buffer[6] << 16) + | |
540 | (buffer[7] << 24); | |
92d07e42 | 541 | |
d2ddce37 APF |
542 | if (n_characters > this_part) { |
543 | dev_err(dev, "Device wants to return more data than requested: %u > %zu\n", n_characters, count); | |
544 | if (data->auto_abort) | |
545 | usbtmc_ioctl_abort_bulk_in(data); | |
546 | goto exit; | |
547 | } | |
548 | ||
549 | /* Remove the USBTMC header */ | |
550 | actual -= USBTMC_HEADER_SIZE; | |
551 | ||
552 | /* Check if the message is smaller than requested */ | |
553 | if (data->rigol_quirk) { | |
554 | if (remaining > n_characters) | |
555 | remaining = n_characters; | |
556 | /* Remove padding if it exists */ | |
557 | if (actual > remaining) | |
558 | actual = remaining; | |
559 | } | |
560 | else { | |
561 | if (this_part > n_characters) | |
562 | this_part = n_characters; | |
563 | /* Remove padding if it exists */ | |
564 | if (actual > this_part) | |
565 | actual = this_part; | |
566 | } | |
567 | ||
568 | dev_dbg(dev, "Bulk-IN header: N_characters(%u), bTransAttr(%u)\n", n_characters, buffer[8]); | |
569 | ||
570 | remaining -= actual; | |
571 | ||
572 | /* Terminate if end-of-message bit received from device */ | |
573 | if ((buffer[8] & 0x01) && (actual >= n_characters)) | |
574 | remaining = 0; | |
575 | ||
576 | dev_dbg(dev, "Bulk-IN header: remaining(%zu), buf(%p), buffer(%p) done(%zu)\n", remaining,buf,buffer,done); | |
577 | ||
578 | ||
579 | /* Copy buffer to user space */ | |
580 | if (copy_to_user(buf + done, &buffer[USBTMC_HEADER_SIZE], actual)) { | |
581 | /* There must have been an addressing problem */ | |
582 | retval = -EFAULT; | |
583 | goto exit; | |
584 | } | |
585 | done += actual; | |
5b775f67 | 586 | } |
d2ddce37 APF |
587 | else { |
588 | if (actual > remaining) | |
589 | actual = remaining; | |
5b775f67 | 590 | |
d2ddce37 APF |
591 | remaining -= actual; |
592 | ||
593 | dev_dbg(dev, "Bulk-IN header cont: actual(%u), done(%zu), remaining(%zu), buf(%p), buffer(%p)\n", actual, done, remaining,buf,buffer); | |
594 | ||
595 | /* Copy buffer to user space */ | |
596 | if (copy_to_user(buf + done, buffer, actual)) { | |
597 | /* There must have been an addressing problem */ | |
598 | retval = -EFAULT; | |
599 | goto exit; | |
600 | } | |
601 | done += actual; | |
602 | } | |
5b775f67 GKH |
603 | } |
604 | ||
605 | /* Update file position value */ | |
606 | *f_pos = *f_pos + done; | |
607 | retval = done; | |
608 | ||
609 | exit: | |
610 | mutex_unlock(&data->io_mutex); | |
611 | kfree(buffer); | |
612 | return retval; | |
613 | } | |
614 | ||
615 | static ssize_t usbtmc_write(struct file *filp, const char __user *buf, | |
616 | size_t count, loff_t *f_pos) | |
617 | { | |
618 | struct usbtmc_device_data *data; | |
619 | u8 *buffer; | |
620 | int retval; | |
621 | int actual; | |
622 | unsigned long int n_bytes; | |
5b775f67 GKH |
623 | int remaining; |
624 | int done; | |
625 | int this_part; | |
626 | ||
627 | data = filp->private_data; | |
628 | ||
629 | buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL); | |
630 | if (!buffer) | |
631 | return -ENOMEM; | |
632 | ||
633 | mutex_lock(&data->io_mutex); | |
86286883 ON |
634 | if (data->zombie) { |
635 | retval = -ENODEV; | |
636 | goto exit; | |
637 | } | |
5b775f67 GKH |
638 | |
639 | remaining = count; | |
640 | done = 0; | |
641 | ||
642 | while (remaining > 0) { | |
50c9ba31 APF |
643 | if (remaining > USBTMC_SIZE_IOBUFFER - USBTMC_HEADER_SIZE) { |
644 | this_part = USBTMC_SIZE_IOBUFFER - USBTMC_HEADER_SIZE; | |
5b775f67 GKH |
645 | buffer[8] = 0; |
646 | } else { | |
647 | this_part = remaining; | |
648 | buffer[8] = 1; | |
649 | } | |
650 | ||
651 | /* Setup IO buffer for DEV_DEP_MSG_OUT message */ | |
652 | buffer[0] = 1; | |
653 | buffer[1] = data->bTag; | |
654 | buffer[2] = ~(data->bTag); | |
655 | buffer[3] = 0; /* Reserved */ | |
656 | buffer[4] = this_part & 255; | |
657 | buffer[5] = (this_part >> 8) & 255; | |
658 | buffer[6] = (this_part >> 16) & 255; | |
659 | buffer[7] = (this_part >> 24) & 255; | |
660 | /* buffer[8] is set above... */ | |
661 | buffer[9] = 0; /* Reserved */ | |
662 | buffer[10] = 0; /* Reserved */ | |
663 | buffer[11] = 0; /* Reserved */ | |
664 | ||
50c9ba31 | 665 | if (copy_from_user(&buffer[USBTMC_HEADER_SIZE], buf + done, this_part)) { |
5b775f67 GKH |
666 | retval = -EFAULT; |
667 | goto exit; | |
668 | } | |
669 | ||
50c9ba31 APF |
670 | n_bytes = roundup(USBTMC_HEADER_SIZE + this_part, 4); |
671 | memset(buffer + USBTMC_HEADER_SIZE + this_part, 0, n_bytes - (USBTMC_HEADER_SIZE + this_part)); | |
5b775f67 | 672 | |
ec412b92 AH |
673 | do { |
674 | retval = usb_bulk_msg(data->usb_dev, | |
675 | usb_sndbulkpipe(data->usb_dev, | |
676 | data->bulk_out), | |
677 | buffer, n_bytes, | |
678 | &actual, USBTMC_TIMEOUT); | |
679 | if (retval != 0) | |
680 | break; | |
681 | n_bytes -= actual; | |
682 | } while (n_bytes); | |
5b775f67 GKH |
683 | |
684 | data->bTag_last_write = data->bTag; | |
685 | data->bTag++; | |
686 | ||
687 | if (!data->bTag) | |
688 | data->bTag++; | |
689 | ||
690 | if (retval < 0) { | |
691 | dev_err(&data->intf->dev, | |
692 | "Unable to send data, error %d\n", retval); | |
693 | if (data->auto_abort) | |
694 | usbtmc_ioctl_abort_bulk_out(data); | |
695 | goto exit; | |
696 | } | |
697 | ||
698 | remaining -= this_part; | |
699 | done += this_part; | |
700 | } | |
701 | ||
702 | retval = count; | |
703 | exit: | |
704 | mutex_unlock(&data->io_mutex); | |
705 | kfree(buffer); | |
706 | return retval; | |
707 | } | |
708 | ||
709 | static int usbtmc_ioctl_clear(struct usbtmc_device_data *data) | |
710 | { | |
711 | struct usb_host_interface *current_setting; | |
712 | struct usb_endpoint_descriptor *desc; | |
713 | struct device *dev; | |
714 | u8 *buffer; | |
715 | int rv; | |
716 | int n; | |
717 | int actual; | |
718 | int max_size; | |
719 | ||
720 | dev = &data->intf->dev; | |
721 | ||
722 | dev_dbg(dev, "Sending INITIATE_CLEAR request\n"); | |
723 | ||
724 | buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL); | |
725 | if (!buffer) | |
726 | return -ENOMEM; | |
727 | ||
728 | rv = usb_control_msg(data->usb_dev, | |
729 | usb_rcvctrlpipe(data->usb_dev, 0), | |
730 | USBTMC_REQUEST_INITIATE_CLEAR, | |
731 | USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE, | |
732 | 0, 0, buffer, 1, USBTMC_TIMEOUT); | |
733 | if (rv < 0) { | |
734 | dev_err(dev, "usb_control_msg returned %d\n", rv); | |
735 | goto exit; | |
736 | } | |
737 | ||
738 | dev_dbg(dev, "INITIATE_CLEAR returned %x\n", buffer[0]); | |
739 | ||
740 | if (buffer[0] != USBTMC_STATUS_SUCCESS) { | |
741 | dev_err(dev, "INITIATE_CLEAR returned %x\n", buffer[0]); | |
742 | rv = -EPERM; | |
743 | goto exit; | |
744 | } | |
745 | ||
746 | max_size = 0; | |
747 | current_setting = data->intf->cur_altsetting; | |
748 | for (n = 0; n < current_setting->desc.bNumEndpoints; n++) { | |
749 | desc = ¤t_setting->endpoint[n].desc; | |
750 | if (desc->bEndpointAddress == data->bulk_in) | |
29cc8897 | 751 | max_size = usb_endpoint_maxp(desc); |
5b775f67 GKH |
752 | } |
753 | ||
754 | if (max_size == 0) { | |
755 | dev_err(dev, "Couldn't get wMaxPacketSize\n"); | |
756 | rv = -EPERM; | |
757 | goto exit; | |
758 | } | |
759 | ||
760 | dev_dbg(dev, "wMaxPacketSize is %d\n", max_size); | |
761 | ||
762 | n = 0; | |
763 | ||
764 | usbtmc_clear_check_status: | |
765 | ||
766 | dev_dbg(dev, "Sending CHECK_CLEAR_STATUS request\n"); | |
767 | ||
768 | rv = usb_control_msg(data->usb_dev, | |
769 | usb_rcvctrlpipe(data->usb_dev, 0), | |
770 | USBTMC_REQUEST_CHECK_CLEAR_STATUS, | |
771 | USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE, | |
772 | 0, 0, buffer, 2, USBTMC_TIMEOUT); | |
773 | if (rv < 0) { | |
774 | dev_err(dev, "usb_control_msg returned %d\n", rv); | |
775 | goto exit; | |
776 | } | |
777 | ||
778 | dev_dbg(dev, "CHECK_CLEAR_STATUS returned %x\n", buffer[0]); | |
779 | ||
780 | if (buffer[0] == USBTMC_STATUS_SUCCESS) | |
781 | goto usbtmc_clear_bulk_out_halt; | |
782 | ||
783 | if (buffer[0] != USBTMC_STATUS_PENDING) { | |
784 | dev_err(dev, "CHECK_CLEAR_STATUS returned %x\n", buffer[0]); | |
785 | rv = -EPERM; | |
786 | goto exit; | |
787 | } | |
788 | ||
789 | if (buffer[1] == 1) | |
790 | do { | |
791 | dev_dbg(dev, "Reading from bulk in EP\n"); | |
792 | ||
793 | rv = usb_bulk_msg(data->usb_dev, | |
794 | usb_rcvbulkpipe(data->usb_dev, | |
795 | data->bulk_in), | |
796 | buffer, USBTMC_SIZE_IOBUFFER, | |
797 | &actual, USBTMC_TIMEOUT); | |
798 | n++; | |
799 | ||
800 | if (rv < 0) { | |
801 | dev_err(dev, "usb_control_msg returned %d\n", | |
802 | rv); | |
803 | goto exit; | |
804 | } | |
805 | } while ((actual == max_size) && | |
806 | (n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN)); | |
807 | ||
808 | if (actual == max_size) { | |
809 | dev_err(dev, "Couldn't clear device buffer within %d cycles\n", | |
810 | USBTMC_MAX_READS_TO_CLEAR_BULK_IN); | |
811 | rv = -EPERM; | |
812 | goto exit; | |
813 | } | |
814 | ||
815 | goto usbtmc_clear_check_status; | |
816 | ||
817 | usbtmc_clear_bulk_out_halt: | |
818 | ||
3342ecda SS |
819 | rv = usb_clear_halt(data->usb_dev, |
820 | usb_sndbulkpipe(data->usb_dev, data->bulk_out)); | |
5b775f67 GKH |
821 | if (rv < 0) { |
822 | dev_err(dev, "usb_control_msg returned %d\n", rv); | |
823 | goto exit; | |
824 | } | |
825 | rv = 0; | |
826 | ||
827 | exit: | |
828 | kfree(buffer); | |
829 | return rv; | |
830 | } | |
831 | ||
832 | static int usbtmc_ioctl_clear_out_halt(struct usbtmc_device_data *data) | |
833 | { | |
5b775f67 GKH |
834 | int rv; |
835 | ||
3342ecda SS |
836 | rv = usb_clear_halt(data->usb_dev, |
837 | usb_sndbulkpipe(data->usb_dev, data->bulk_out)); | |
5b775f67 GKH |
838 | |
839 | if (rv < 0) { | |
840 | dev_err(&data->usb_dev->dev, "usb_control_msg returned %d\n", | |
841 | rv); | |
ac9e59ca | 842 | return rv; |
5b775f67 | 843 | } |
ac9e59ca | 844 | return 0; |
5b775f67 GKH |
845 | } |
846 | ||
847 | static int usbtmc_ioctl_clear_in_halt(struct usbtmc_device_data *data) | |
848 | { | |
5b775f67 GKH |
849 | int rv; |
850 | ||
3342ecda SS |
851 | rv = usb_clear_halt(data->usb_dev, |
852 | usb_rcvbulkpipe(data->usb_dev, data->bulk_in)); | |
5b775f67 GKH |
853 | |
854 | if (rv < 0) { | |
855 | dev_err(&data->usb_dev->dev, "usb_control_msg returned %d\n", | |
856 | rv); | |
ac9e59ca | 857 | return rv; |
5b775f67 | 858 | } |
ac9e59ca | 859 | return 0; |
5b775f67 GKH |
860 | } |
861 | ||
862 | static int get_capabilities(struct usbtmc_device_data *data) | |
863 | { | |
864 | struct device *dev = &data->usb_dev->dev; | |
865 | char *buffer; | |
ca157c4a | 866 | int rv = 0; |
5b775f67 GKH |
867 | |
868 | buffer = kmalloc(0x18, GFP_KERNEL); | |
869 | if (!buffer) | |
870 | return -ENOMEM; | |
871 | ||
872 | rv = usb_control_msg(data->usb_dev, usb_rcvctrlpipe(data->usb_dev, 0), | |
873 | USBTMC_REQUEST_GET_CAPABILITIES, | |
874 | USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE, | |
875 | 0, 0, buffer, 0x18, USBTMC_TIMEOUT); | |
876 | if (rv < 0) { | |
877 | dev_err(dev, "usb_control_msg returned %d\n", rv); | |
ca157c4a | 878 | goto err_out; |
5b775f67 GKH |
879 | } |
880 | ||
881 | dev_dbg(dev, "GET_CAPABILITIES returned %x\n", buffer[0]); | |
5b775f67 GKH |
882 | if (buffer[0] != USBTMC_STATUS_SUCCESS) { |
883 | dev_err(dev, "GET_CAPABILITIES returned %x\n", buffer[0]); | |
ca157c4a ON |
884 | rv = -EPERM; |
885 | goto err_out; | |
5b775f67 | 886 | } |
d0a38365 GI |
887 | dev_dbg(dev, "Interface capabilities are %x\n", buffer[4]); |
888 | dev_dbg(dev, "Device capabilities are %x\n", buffer[5]); | |
889 | dev_dbg(dev, "USB488 interface capabilities are %x\n", buffer[14]); | |
890 | dev_dbg(dev, "USB488 device capabilities are %x\n", buffer[15]); | |
5b775f67 GKH |
891 | |
892 | data->capabilities.interface_capabilities = buffer[4]; | |
893 | data->capabilities.device_capabilities = buffer[5]; | |
894 | data->capabilities.usb488_interface_capabilities = buffer[14]; | |
895 | data->capabilities.usb488_device_capabilities = buffer[15]; | |
d0a38365 | 896 | rv = 0; |
5b775f67 | 897 | |
ca157c4a | 898 | err_out: |
5b775f67 | 899 | kfree(buffer); |
ca157c4a | 900 | return rv; |
5b775f67 GKH |
901 | } |
902 | ||
903 | #define capability_attribute(name) \ | |
904 | static ssize_t show_##name(struct device *dev, \ | |
905 | struct device_attribute *attr, char *buf) \ | |
906 | { \ | |
907 | struct usb_interface *intf = to_usb_interface(dev); \ | |
908 | struct usbtmc_device_data *data = usb_get_intfdata(intf); \ | |
909 | \ | |
910 | return sprintf(buf, "%d\n", data->capabilities.name); \ | |
911 | } \ | |
912 | static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL) | |
913 | ||
914 | capability_attribute(interface_capabilities); | |
915 | capability_attribute(device_capabilities); | |
916 | capability_attribute(usb488_interface_capabilities); | |
917 | capability_attribute(usb488_device_capabilities); | |
918 | ||
919 | static struct attribute *capability_attrs[] = { | |
920 | &dev_attr_interface_capabilities.attr, | |
921 | &dev_attr_device_capabilities.attr, | |
922 | &dev_attr_usb488_interface_capabilities.attr, | |
923 | &dev_attr_usb488_device_capabilities.attr, | |
924 | NULL, | |
925 | }; | |
926 | ||
927 | static struct attribute_group capability_attr_grp = { | |
928 | .attrs = capability_attrs, | |
929 | }; | |
930 | ||
931 | static ssize_t show_TermChar(struct device *dev, | |
932 | struct device_attribute *attr, char *buf) | |
933 | { | |
934 | struct usb_interface *intf = to_usb_interface(dev); | |
935 | struct usbtmc_device_data *data = usb_get_intfdata(intf); | |
936 | ||
937 | return sprintf(buf, "%c\n", data->TermChar); | |
938 | } | |
939 | ||
940 | static ssize_t store_TermChar(struct device *dev, | |
941 | struct device_attribute *attr, | |
942 | const char *buf, size_t count) | |
943 | { | |
944 | struct usb_interface *intf = to_usb_interface(dev); | |
945 | struct usbtmc_device_data *data = usb_get_intfdata(intf); | |
946 | ||
947 | if (count < 1) | |
948 | return -EINVAL; | |
949 | data->TermChar = buf[0]; | |
950 | return count; | |
951 | } | |
952 | static DEVICE_ATTR(TermChar, S_IRUGO, show_TermChar, store_TermChar); | |
953 | ||
954 | #define data_attribute(name) \ | |
955 | static ssize_t show_##name(struct device *dev, \ | |
956 | struct device_attribute *attr, char *buf) \ | |
957 | { \ | |
958 | struct usb_interface *intf = to_usb_interface(dev); \ | |
959 | struct usbtmc_device_data *data = usb_get_intfdata(intf); \ | |
960 | \ | |
961 | return sprintf(buf, "%d\n", data->name); \ | |
962 | } \ | |
963 | static ssize_t store_##name(struct device *dev, \ | |
964 | struct device_attribute *attr, \ | |
965 | const char *buf, size_t count) \ | |
966 | { \ | |
967 | struct usb_interface *intf = to_usb_interface(dev); \ | |
968 | struct usbtmc_device_data *data = usb_get_intfdata(intf); \ | |
969 | ssize_t result; \ | |
970 | unsigned val; \ | |
971 | \ | |
972 | result = sscanf(buf, "%u\n", &val); \ | |
973 | if (result != 1) \ | |
974 | result = -EINVAL; \ | |
975 | data->name = val; \ | |
976 | if (result < 0) \ | |
977 | return result; \ | |
978 | else \ | |
979 | return count; \ | |
980 | } \ | |
981 | static DEVICE_ATTR(name, S_IRUGO, show_##name, store_##name) | |
982 | ||
983 | data_attribute(TermCharEnabled); | |
984 | data_attribute(auto_abort); | |
985 | ||
986 | static struct attribute *data_attrs[] = { | |
987 | &dev_attr_TermChar.attr, | |
988 | &dev_attr_TermCharEnabled.attr, | |
989 | &dev_attr_auto_abort.attr, | |
990 | NULL, | |
991 | }; | |
992 | ||
993 | static struct attribute_group data_attr_grp = { | |
994 | .attrs = data_attrs, | |
995 | }; | |
996 | ||
997 | static int usbtmc_ioctl_indicator_pulse(struct usbtmc_device_data *data) | |
998 | { | |
999 | struct device *dev; | |
1000 | u8 *buffer; | |
1001 | int rv; | |
1002 | ||
1003 | dev = &data->intf->dev; | |
1004 | ||
1005 | buffer = kmalloc(2, GFP_KERNEL); | |
1006 | if (!buffer) | |
1007 | return -ENOMEM; | |
1008 | ||
1009 | rv = usb_control_msg(data->usb_dev, | |
1010 | usb_rcvctrlpipe(data->usb_dev, 0), | |
1011 | USBTMC_REQUEST_INDICATOR_PULSE, | |
1012 | USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE, | |
1013 | 0, 0, buffer, 0x01, USBTMC_TIMEOUT); | |
1014 | ||
1015 | if (rv < 0) { | |
1016 | dev_err(dev, "usb_control_msg returned %d\n", rv); | |
1017 | goto exit; | |
1018 | } | |
1019 | ||
1020 | dev_dbg(dev, "INDICATOR_PULSE returned %x\n", buffer[0]); | |
1021 | ||
1022 | if (buffer[0] != USBTMC_STATUS_SUCCESS) { | |
1023 | dev_err(dev, "INDICATOR_PULSE returned %x\n", buffer[0]); | |
1024 | rv = -EPERM; | |
1025 | goto exit; | |
1026 | } | |
1027 | rv = 0; | |
1028 | ||
1029 | exit: | |
1030 | kfree(buffer); | |
1031 | return rv; | |
1032 | } | |
1033 | ||
1034 | static long usbtmc_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
1035 | { | |
1036 | struct usbtmc_device_data *data; | |
1037 | int retval = -EBADRQC; | |
1038 | ||
1039 | data = file->private_data; | |
1040 | mutex_lock(&data->io_mutex); | |
86286883 ON |
1041 | if (data->zombie) { |
1042 | retval = -ENODEV; | |
1043 | goto skip_io_on_zombie; | |
1044 | } | |
5b775f67 GKH |
1045 | |
1046 | switch (cmd) { | |
1047 | case USBTMC_IOCTL_CLEAR_OUT_HALT: | |
1048 | retval = usbtmc_ioctl_clear_out_halt(data); | |
a92b63e7 | 1049 | break; |
5b775f67 GKH |
1050 | |
1051 | case USBTMC_IOCTL_CLEAR_IN_HALT: | |
1052 | retval = usbtmc_ioctl_clear_in_halt(data); | |
a92b63e7 | 1053 | break; |
5b775f67 GKH |
1054 | |
1055 | case USBTMC_IOCTL_INDICATOR_PULSE: | |
1056 | retval = usbtmc_ioctl_indicator_pulse(data); | |
a92b63e7 | 1057 | break; |
5b775f67 GKH |
1058 | |
1059 | case USBTMC_IOCTL_CLEAR: | |
1060 | retval = usbtmc_ioctl_clear(data); | |
a92b63e7 | 1061 | break; |
5b775f67 GKH |
1062 | |
1063 | case USBTMC_IOCTL_ABORT_BULK_OUT: | |
1064 | retval = usbtmc_ioctl_abort_bulk_out(data); | |
a92b63e7 | 1065 | break; |
5b775f67 GKH |
1066 | |
1067 | case USBTMC_IOCTL_ABORT_BULK_IN: | |
1068 | retval = usbtmc_ioctl_abort_bulk_in(data); | |
a92b63e7 | 1069 | break; |
5b775f67 GKH |
1070 | } |
1071 | ||
86286883 | 1072 | skip_io_on_zombie: |
5b775f67 GKH |
1073 | mutex_unlock(&data->io_mutex); |
1074 | return retval; | |
1075 | } | |
1076 | ||
828c0950 | 1077 | static const struct file_operations fops = { |
5b775f67 GKH |
1078 | .owner = THIS_MODULE, |
1079 | .read = usbtmc_read, | |
1080 | .write = usbtmc_write, | |
1081 | .open = usbtmc_open, | |
1082 | .release = usbtmc_release, | |
1083 | .unlocked_ioctl = usbtmc_ioctl, | |
6038f373 | 1084 | .llseek = default_llseek, |
5b775f67 GKH |
1085 | }; |
1086 | ||
1087 | static struct usb_class_driver usbtmc_class = { | |
1088 | .name = "usbtmc%d", | |
1089 | .fops = &fops, | |
1090 | .minor_base = USBTMC_MINOR_BASE, | |
1091 | }; | |
1092 | ||
1093 | ||
1094 | static int usbtmc_probe(struct usb_interface *intf, | |
1095 | const struct usb_device_id *id) | |
1096 | { | |
1097 | struct usbtmc_device_data *data; | |
1098 | struct usb_host_interface *iface_desc; | |
1099 | struct usb_endpoint_descriptor *endpoint; | |
1100 | int n; | |
1101 | int retcode; | |
1102 | ||
1103 | dev_dbg(&intf->dev, "%s called\n", __func__); | |
1104 | ||
1105 | data = kmalloc(sizeof(struct usbtmc_device_data), GFP_KERNEL); | |
1106 | if (!data) { | |
1107 | dev_err(&intf->dev, "Unable to allocate kernel memory\n"); | |
1108 | return -ENOMEM; | |
1109 | } | |
1110 | ||
1111 | data->intf = intf; | |
1112 | data->id = id; | |
1113 | data->usb_dev = usb_get_dev(interface_to_usbdev(intf)); | |
1114 | usb_set_intfdata(intf, data); | |
1115 | kref_init(&data->kref); | |
1116 | mutex_init(&data->io_mutex); | |
86286883 | 1117 | data->zombie = 0; |
5b775f67 | 1118 | |
c2e31483 APF |
1119 | /* Determine if it is a Rigol or not */ |
1120 | data->rigol_quirk = 0; | |
1121 | dev_dbg(&intf->dev, "Trying to find if device Vendor 0x%04X Product 0x%04X has the RIGOL quirk\n", | |
1122 | data->usb_dev->descriptor.idVendor, | |
1123 | data->usb_dev->descriptor.idProduct); | |
1124 | for(n = 0; usbtmc_id_quirk[n].idVendor > 0; n++) { | |
1125 | if ((usbtmc_id_quirk[n].idVendor == data->usb_dev->descriptor.idVendor) && | |
1126 | (usbtmc_id_quirk[n].idProduct == data->usb_dev->descriptor.idProduct)) { | |
1127 | dev_dbg(&intf->dev, "Setting this device as having the RIGOL quirk\n"); | |
1128 | data->rigol_quirk = 1; | |
1129 | break; | |
1130 | } | |
1131 | } | |
1132 | ||
5b775f67 GKH |
1133 | /* Initialize USBTMC bTag and other fields */ |
1134 | data->bTag = 1; | |
1135 | data->TermCharEnabled = 0; | |
1136 | data->TermChar = '\n'; | |
1137 | ||
1138 | /* USBTMC devices have only one setting, so use that */ | |
1139 | iface_desc = data->intf->cur_altsetting; | |
1140 | ||
1141 | /* Find bulk in endpoint */ | |
1142 | for (n = 0; n < iface_desc->desc.bNumEndpoints; n++) { | |
1143 | endpoint = &iface_desc->endpoint[n].desc; | |
1144 | ||
1145 | if (usb_endpoint_is_bulk_in(endpoint)) { | |
1146 | data->bulk_in = endpoint->bEndpointAddress; | |
1147 | dev_dbg(&intf->dev, "Found bulk in endpoint at %u\n", | |
1148 | data->bulk_in); | |
1149 | break; | |
1150 | } | |
1151 | } | |
1152 | ||
1153 | /* Find bulk out endpoint */ | |
1154 | for (n = 0; n < iface_desc->desc.bNumEndpoints; n++) { | |
1155 | endpoint = &iface_desc->endpoint[n].desc; | |
1156 | ||
1157 | if (usb_endpoint_is_bulk_out(endpoint)) { | |
1158 | data->bulk_out = endpoint->bEndpointAddress; | |
1159 | dev_dbg(&intf->dev, "Found Bulk out endpoint at %u\n", | |
1160 | data->bulk_out); | |
1161 | break; | |
1162 | } | |
1163 | } | |
1164 | ||
1165 | retcode = get_capabilities(data); | |
1166 | if (retcode) | |
1167 | dev_err(&intf->dev, "can't read capabilities\n"); | |
1168 | else | |
1169 | retcode = sysfs_create_group(&intf->dev.kobj, | |
1170 | &capability_attr_grp); | |
1171 | ||
1172 | retcode = sysfs_create_group(&intf->dev.kobj, &data_attr_grp); | |
1173 | ||
1174 | retcode = usb_register_dev(intf, &usbtmc_class); | |
1175 | if (retcode) { | |
1176 | dev_err(&intf->dev, "Not able to get a minor" | |
1177 | " (base %u, slice default): %d\n", USBTMC_MINOR_BASE, | |
1178 | retcode); | |
1179 | goto error_register; | |
1180 | } | |
1181 | dev_dbg(&intf->dev, "Using minor number %d\n", intf->minor); | |
1182 | ||
1183 | return 0; | |
1184 | ||
1185 | error_register: | |
1186 | sysfs_remove_group(&intf->dev.kobj, &capability_attr_grp); | |
1187 | sysfs_remove_group(&intf->dev.kobj, &data_attr_grp); | |
1188 | kref_put(&data->kref, usbtmc_delete); | |
1189 | return retcode; | |
1190 | } | |
1191 | ||
1192 | static void usbtmc_disconnect(struct usb_interface *intf) | |
1193 | { | |
1194 | struct usbtmc_device_data *data; | |
1195 | ||
1196 | dev_dbg(&intf->dev, "usbtmc_disconnect called\n"); | |
1197 | ||
1198 | data = usb_get_intfdata(intf); | |
1199 | usb_deregister_dev(intf, &usbtmc_class); | |
1200 | sysfs_remove_group(&intf->dev.kobj, &capability_attr_grp); | |
1201 | sysfs_remove_group(&intf->dev.kobj, &data_attr_grp); | |
86286883 ON |
1202 | mutex_lock(&data->io_mutex); |
1203 | data->zombie = 1; | |
1204 | mutex_unlock(&data->io_mutex); | |
5b775f67 GKH |
1205 | kref_put(&data->kref, usbtmc_delete); |
1206 | } | |
1207 | ||
dca8cd04 | 1208 | static int usbtmc_suspend(struct usb_interface *intf, pm_message_t message) |
a4708103 ON |
1209 | { |
1210 | /* this driver does not have pending URBs */ | |
1211 | return 0; | |
1212 | } | |
1213 | ||
dca8cd04 | 1214 | static int usbtmc_resume(struct usb_interface *intf) |
a4708103 ON |
1215 | { |
1216 | return 0; | |
1217 | } | |
1218 | ||
5b775f67 GKH |
1219 | static struct usb_driver usbtmc_driver = { |
1220 | .name = "usbtmc", | |
1221 | .id_table = usbtmc_devices, | |
1222 | .probe = usbtmc_probe, | |
a4708103 ON |
1223 | .disconnect = usbtmc_disconnect, |
1224 | .suspend = usbtmc_suspend, | |
1225 | .resume = usbtmc_resume, | |
5b775f67 GKH |
1226 | }; |
1227 | ||
65db4305 | 1228 | module_usb_driver(usbtmc_driver); |
5b775f67 GKH |
1229 | |
1230 | MODULE_LICENSE("GPL"); |