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1 | /* |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2014 Aurelien Jacobs <aurel@gnuage.org> | |
5 | * | |
6 | * This program is free software: you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation, either version 3 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
20 | #include <string.h> | |
21 | #include "libsigrok.h" | |
22 | #include "libsigrok-internal.h" | |
23 | ||
24 | #define LOG_PREFIX "scpi_usbtmc" | |
25 | ||
26 | #define MAX_TRANSFER_LENGTH 2048 | |
27 | #define TRANSFER_TIMEOUT 1000 | |
28 | ||
29 | struct scpi_usbtmc_libusb { | |
30 | struct sr_context *ctx; | |
31 | struct sr_usb_dev_inst *usb; | |
32 | int detached_kernel_driver; | |
33 | uint8_t interface; | |
34 | uint8_t bulk_in_ep; | |
35 | uint8_t bulk_out_ep; | |
36 | uint8_t interrupt_ep; | |
37 | uint8_t usbtmc_int_cap; | |
38 | uint8_t usbtmc_dev_cap; | |
39 | uint8_t usb488_dev_cap; | |
40 | uint8_t bTag; | |
41 | uint8_t bulkin_attributes; | |
42 | uint8_t buffer[MAX_TRANSFER_LENGTH]; | |
43 | int response_length; | |
44 | int response_bytes_read; | |
45 | int remaining_length; | |
46 | }; | |
47 | ||
48 | /* Some USBTMC-specific enums, as defined in the USBTMC standard. */ | |
49 | #define SUBCLASS_USBTMC 0x03 | |
50 | #define USBTMC_USB488 0x01 | |
51 | ||
52 | enum { | |
53 | /* USBTMC control requests */ | |
54 | INITIATE_ABORT_BULK_OUT = 1, | |
55 | CHECK_ABORT_BULK_OUT_STATUS = 2, | |
56 | INITIATE_ABORT_BULK_IN = 3, | |
57 | CHECK_ABORT_BULK_IN_STATUS = 4, | |
58 | INITIATE_CLEAR = 5, | |
59 | CHECK_CLEAR_STATUS = 6, | |
60 | GET_CAPABILITIES = 7, | |
61 | INDICATOR_PULSE = 64, | |
62 | ||
63 | /* USB488 control requests */ | |
64 | READ_STATUS_BYTE = 128, | |
65 | REN_CONTROL = 160, | |
66 | GO_TO_LOCAL = 161, | |
67 | LOCAL_LOCKOUT = 162, | |
68 | }; | |
69 | ||
70 | /* USBTMC capabilities */ | |
71 | #define USBTMC_INT_CAP_LISTEN_ONLY 0x01 | |
72 | #define USBTMC_INT_CAP_TALK_ONLY 0x02 | |
73 | #define USBTMC_INT_CAP_INDICATOR 0x04 | |
74 | ||
75 | #define USBTMC_DEV_CAP_TERMCHAR 0x01 | |
76 | ||
77 | #define USB488_DEV_CAP_DT1 0x01 | |
78 | #define USB488_DEV_CAP_RL1 0x02 | |
79 | #define USB488_DEV_CAP_SR1 0x04 | |
80 | #define USB488_DEV_CAP_SCPI 0x08 | |
81 | ||
82 | /* Bulk messages constants */ | |
83 | #define USBTMC_BULK_HEADER_SIZE 12 | |
84 | ||
85 | /* Bulk MsgID values */ | |
86 | #define DEV_DEP_MSG_OUT 1 | |
87 | #define REQUEST_DEV_DEP_MSG_IN 2 | |
88 | #define DEV_DEP_MSG_IN 2 | |
89 | ||
90 | /* bmTransferAttributes */ | |
91 | #define EOM 0x01 | |
92 | #define TERM_CHAR_ENABLED 0x02 | |
93 | ||
94 | ||
95 | static GSList *scpi_usbtmc_libusb_scan(struct drv_context *drvc) | |
96 | { | |
97 | struct libusb_device **devlist; | |
98 | struct libusb_device_descriptor des; | |
99 | struct libusb_config_descriptor *confdes; | |
100 | const struct libusb_interface_descriptor *intfdes; | |
101 | GSList *resources = NULL; | |
102 | int confidx, intfidx, ret, i; | |
103 | char *res; | |
104 | ||
105 | libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist); | |
106 | for (i = 0; devlist[i]; i++) { | |
107 | if ((ret = libusb_get_device_descriptor(devlist[i], &des))) { | |
108 | sr_err("Failed to get device descriptor: %s.", | |
109 | libusb_error_name(ret)); | |
110 | continue; | |
111 | } | |
112 | ||
113 | for (confidx = 0; confidx < des.bNumConfigurations; confidx++) { | |
114 | if (libusb_get_config_descriptor(devlist[i], confidx, &confdes) != 0) { | |
115 | sr_err("Failed to get configuration descriptor."); | |
116 | break; | |
117 | } | |
118 | for (intfidx = 0; intfidx < confdes->bNumInterfaces; intfidx++) { | |
119 | intfdes = confdes->interface[intfidx].altsetting; | |
120 | if (intfdes->bInterfaceClass != LIBUSB_CLASS_APPLICATION || | |
121 | intfdes->bInterfaceSubClass != SUBCLASS_USBTMC || | |
122 | intfdes->bInterfaceProtocol != USBTMC_USB488) | |
123 | continue; | |
124 | sr_dbg("Found USBTMC device (VID:PID = %04x:%04x, " | |
125 | "bus.address = %d.%d).", des.idVendor, des.idProduct, | |
126 | libusb_get_bus_number(devlist[i]), | |
127 | libusb_get_device_address(devlist[i])); | |
128 | res = g_strdup_printf("usbtmc/%d.%d", | |
129 | libusb_get_bus_number(devlist[i]), | |
130 | libusb_get_device_address(devlist[i])); | |
131 | resources = g_slist_append(resources, res); | |
132 | } | |
133 | libusb_free_config_descriptor(confdes); | |
134 | } | |
135 | } | |
136 | libusb_free_device_list(devlist, 1); | |
137 | ||
138 | sr_dbg("Found %d device(s).", g_slist_length(resources)); | |
139 | ||
140 | return resources; | |
141 | } | |
142 | ||
143 | static int scpi_usbtmc_libusb_dev_inst_new(void *priv, struct drv_context *drvc, | |
144 | const char *resource, char **params, const char *serialcomm) | |
145 | { | |
146 | struct scpi_usbtmc_libusb *uscpi = priv; | |
147 | GSList *devices; | |
148 | ||
149 | (void)resource; | |
150 | (void)serialcomm; | |
151 | ||
152 | if (!params || !params[1]) { | |
153 | sr_err("Invalid parameters."); | |
154 | return SR_ERR; | |
155 | } | |
156 | ||
157 | uscpi->ctx = drvc->sr_ctx; | |
158 | devices = sr_usb_find(uscpi->ctx->libusb_ctx, params[1]); | |
159 | if (g_slist_length(devices) != 1) { | |
160 | sr_err("Failed to find USB device '%s'.", params[1]); | |
161 | g_slist_free_full(devices, (GDestroyNotify)sr_usb_dev_inst_free); | |
162 | return SR_ERR; | |
163 | } | |
164 | uscpi->usb = devices->data; | |
165 | g_slist_free(devices); | |
166 | ||
167 | return SR_OK; | |
168 | } | |
169 | ||
170 | static int scpi_usbtmc_libusb_open(void *priv) | |
171 | { | |
172 | struct scpi_usbtmc_libusb *uscpi = priv; | |
173 | struct sr_usb_dev_inst *usb = uscpi->usb; | |
174 | struct libusb_device *dev; | |
175 | struct libusb_device_descriptor des; | |
176 | struct libusb_config_descriptor *confdes; | |
177 | const struct libusb_interface_descriptor *intfdes; | |
178 | const struct libusb_endpoint_descriptor *ep; | |
179 | int confidx, intfidx, epidx, config = 0; | |
180 | uint8_t capabilities[24]; | |
181 | int ret, found = 0; | |
182 | ||
183 | if (usb->devhdl) | |
184 | return SR_OK; | |
185 | ||
186 | if (sr_usb_open(uscpi->ctx->libusb_ctx, usb) != SR_OK) | |
187 | return SR_ERR; | |
188 | ||
189 | dev = libusb_get_device(usb->devhdl); | |
190 | if ((ret = libusb_get_device_descriptor(dev, &des))) { | |
191 | sr_err("Failed to get device descriptor: %s.", | |
192 | libusb_error_name(ret)); | |
193 | return SR_ERR; | |
194 | } | |
195 | ||
196 | for (confidx = 0; confidx < des.bNumConfigurations; confidx++) { | |
197 | if (libusb_get_config_descriptor(dev, confidx, &confdes) != 0) { | |
198 | sr_err("Failed to get configuration descriptor."); | |
199 | continue; | |
200 | } | |
201 | for (intfidx = 0; intfidx < confdes->bNumInterfaces; intfidx++) { | |
202 | intfdes = confdes->interface[intfidx].altsetting; | |
203 | if (intfdes->bInterfaceClass != LIBUSB_CLASS_APPLICATION || | |
204 | intfdes->bInterfaceSubClass != SUBCLASS_USBTMC || | |
205 | intfdes->bInterfaceProtocol != USBTMC_USB488) | |
206 | continue; | |
207 | uscpi->interface = intfdes->bInterfaceNumber; | |
208 | sr_dbg("Interface %d", uscpi->interface); | |
209 | config = confdes->bConfigurationValue; | |
210 | sr_dbg("Configuration %d", config); | |
211 | for (epidx = 0; epidx < intfdes->bNumEndpoints; epidx++) { | |
212 | ep = &intfdes->endpoint[epidx]; | |
213 | if (ep->bmAttributes == LIBUSB_TRANSFER_TYPE_BULK && | |
214 | !(ep->bEndpointAddress & (LIBUSB_ENDPOINT_DIR_MASK))) { | |
215 | uscpi->bulk_out_ep = ep->bEndpointAddress; | |
216 | sr_dbg("Bulk OUT EP %d", uscpi->bulk_out_ep); | |
217 | } | |
218 | if (ep->bmAttributes == LIBUSB_TRANSFER_TYPE_BULK && | |
219 | ep->bEndpointAddress & (LIBUSB_ENDPOINT_DIR_MASK)) { | |
220 | uscpi->bulk_in_ep = ep->bEndpointAddress; | |
221 | sr_dbg("Bulk IN EP %d", uscpi->bulk_in_ep); | |
222 | } | |
223 | if (ep->bmAttributes == LIBUSB_TRANSFER_TYPE_INTERRUPT && | |
224 | ep->bEndpointAddress & (LIBUSB_ENDPOINT_DIR_MASK)) { | |
225 | uscpi->interrupt_ep = ep->bEndpointAddress; | |
226 | sr_dbg("Interrupt EP %d", uscpi->interrupt_ep); | |
227 | } | |
228 | } | |
229 | found = 1; | |
230 | } | |
231 | libusb_free_config_descriptor(confdes); | |
232 | if (found) | |
233 | break; | |
234 | } | |
235 | ||
236 | if (!found) { | |
237 | sr_err("Failed to find USBTMC interface"); | |
238 | return SR_ERR; | |
239 | } | |
240 | ||
241 | if (libusb_kernel_driver_active(usb->devhdl, uscpi->interface) == 1) { | |
242 | if ((ret = libusb_detach_kernel_driver(usb->devhdl, | |
243 | uscpi->interface)) < 0) { | |
244 | sr_err("failed to detach kernel driver: %s", | |
245 | libusb_error_name(ret)); | |
246 | return SR_ERR; | |
247 | } | |
248 | uscpi->detached_kernel_driver = 1; | |
249 | } | |
250 | ||
251 | if ((ret = libusb_set_configuration(usb->devhdl, config))) { | |
252 | sr_err("Failed to set configuration: %s.", libusb_error_name(ret)); | |
253 | return SR_ERR; | |
254 | } | |
255 | ||
256 | if ((ret = libusb_claim_interface(usb->devhdl, uscpi->interface))) { | |
257 | sr_err("Failed to claim interface: %s.", libusb_error_name(ret)); | |
258 | return SR_ERR; | |
259 | } | |
260 | ||
261 | libusb_clear_halt(usb->devhdl, uscpi->bulk_in_ep); | |
262 | libusb_clear_halt(usb->devhdl, uscpi->bulk_out_ep); | |
263 | libusb_clear_halt(usb->devhdl, uscpi->interrupt_ep); | |
264 | ||
265 | /* get capabilities */ | |
266 | ret = libusb_control_transfer(usb->devhdl, | |
267 | LIBUSB_ENDPOINT_IN | | |
268 | LIBUSB_REQUEST_TYPE_CLASS | | |
269 | LIBUSB_RECIPIENT_INTERFACE, | |
270 | GET_CAPABILITIES, 0, | |
271 | uscpi->interface, | |
272 | capabilities, sizeof(capabilities), | |
273 | TRANSFER_TIMEOUT); | |
274 | if (ret == sizeof(capabilities)) { | |
275 | uscpi->usbtmc_int_cap = capabilities[ 4]; | |
276 | uscpi->usbtmc_dev_cap = capabilities[ 5]; | |
277 | uscpi->usb488_dev_cap = capabilities[15]; | |
278 | } | |
279 | sr_dbg("device capabilities: %s%s%s%s%s, %s, %s", | |
280 | uscpi->usb488_dev_cap & USB488_DEV_CAP_SCPI ? "SCPI, " : "", | |
281 | uscpi->usbtmc_dev_cap & USBTMC_DEV_CAP_TERMCHAR ? "TermChar, ": "", | |
282 | uscpi->usbtmc_int_cap & USBTMC_INT_CAP_LISTEN_ONLY? "L3, " : | |
283 | uscpi->usbtmc_int_cap & USBTMC_INT_CAP_TALK_ONLY ? "" : "L4, ", | |
284 | uscpi->usbtmc_int_cap & USBTMC_INT_CAP_TALK_ONLY ? "T5, " : | |
285 | uscpi->usbtmc_int_cap & USBTMC_INT_CAP_LISTEN_ONLY? "" : "T6, ", | |
286 | uscpi->usb488_dev_cap & USB488_DEV_CAP_SR1 ? "SR1" : "SR0", | |
287 | uscpi->usb488_dev_cap & USB488_DEV_CAP_RL1 ? "RL1" : "RL0", | |
288 | uscpi->usb488_dev_cap & USB488_DEV_CAP_DT1 ? "DT1" : "DT0"); | |
289 | ||
290 | return SR_OK; | |
291 | } | |
292 | ||
293 | static int scpi_usbtmc_libusb_source_add(void *priv, int events, int timeout, | |
294 | sr_receive_data_callback_t cb, void *cb_data) | |
295 | { | |
296 | struct scpi_usbtmc_libusb *uscpi = priv; | |
297 | (void)events; | |
298 | return usb_source_add(uscpi->ctx, timeout, cb, cb_data); | |
299 | } | |
300 | ||
301 | static int scpi_usbtmc_libusb_source_remove(void *priv) | |
302 | { | |
303 | struct scpi_usbtmc_libusb *uscpi = priv; | |
304 | return usb_source_remove(uscpi->ctx); | |
305 | } | |
306 | ||
307 | static void usbtmc_bulk_out_header_write(void *header, uint8_t MsgID, | |
308 | uint8_t bTag, | |
309 | uint32_t TransferSize, | |
310 | uint8_t bmTransferAttributes, | |
311 | char TermChar) | |
312 | { | |
313 | W8(header+ 0, MsgID); | |
314 | W8(header+ 1, bTag); | |
315 | W8(header+ 2, ~bTag); | |
316 | W8(header+ 3, 0); | |
317 | WL32(header+ 4, TransferSize); | |
318 | W8(header+ 8, bmTransferAttributes); | |
319 | W8(header+ 9, TermChar); | |
320 | WL16(header+10, 0); | |
321 | } | |
322 | ||
323 | static int usbtmc_bulk_in_header_read(void *header, uint8_t MsgID, | |
324 | unsigned char bTag, | |
325 | int32_t *TransferSize, | |
326 | uint8_t *bmTransferAttributes) | |
327 | { | |
328 | if (R8(header+0) != MsgID || | |
329 | R8(header+1) != bTag || | |
330 | R8(header+2) != (unsigned char)~bTag) | |
331 | return SR_ERR; | |
332 | if (TransferSize) | |
333 | *TransferSize = RL32(header+4); | |
334 | if (bmTransferAttributes) | |
335 | *bmTransferAttributes = R8(header+8); | |
336 | return SR_OK; | |
337 | } | |
338 | ||
339 | static int scpi_usbtmc_bulkout(struct scpi_usbtmc_libusb *uscpi, | |
340 | uint8_t msg_id, const void *data, int32_t size, | |
341 | uint8_t transfer_attributes) | |
342 | { | |
343 | struct sr_usb_dev_inst *usb = uscpi->usb; | |
344 | int padded_size, ret, transferred; | |
345 | ||
346 | if (data && size+USBTMC_BULK_HEADER_SIZE+3 > (int)sizeof(uscpi->buffer)) { | |
347 | sr_err("USBTMC bulk out transfer too big"); | |
348 | return SR_ERR; | |
349 | } | |
350 | ||
351 | uscpi->bTag++; | |
352 | uscpi->bTag += !uscpi->bTag; /* bTag == 0 is invalid so avoid it */ | |
353 | ||
354 | usbtmc_bulk_out_header_write(uscpi->buffer, msg_id, uscpi->bTag, | |
355 | size, transfer_attributes, 0); | |
356 | if (data) | |
357 | memcpy(uscpi->buffer+USBTMC_BULK_HEADER_SIZE, data, size); | |
358 | else | |
359 | size = 0; | |
360 | size += USBTMC_BULK_HEADER_SIZE; | |
361 | padded_size = (size + 3) & ~0x3; | |
362 | memset(uscpi->buffer+size, 0, padded_size - size); | |
363 | ||
364 | ret = libusb_bulk_transfer(usb->devhdl, uscpi->bulk_out_ep, | |
365 | uscpi->buffer, padded_size, &transferred, | |
366 | TRANSFER_TIMEOUT); | |
367 | if (ret) { | |
368 | sr_err("USBTMC bulk out transfer error: %d", ret); | |
369 | return SR_ERR; | |
370 | } | |
371 | ||
372 | if (transferred < padded_size) { | |
373 | sr_dbg("USBTMC bulkout partial transfer (%d/%d bytes)", | |
374 | transferred, padded_size); | |
375 | return SR_ERR; | |
376 | } | |
377 | ||
378 | return transferred - USBTMC_BULK_HEADER_SIZE; | |
379 | } | |
380 | ||
381 | static int scpi_usbtmc_bulkin_start(struct scpi_usbtmc_libusb *uscpi, | |
382 | uint8_t msg_id, void *data, int32_t size, | |
383 | uint8_t *transfer_attributes) | |
384 | { | |
385 | struct sr_usb_dev_inst *usb = uscpi->usb; | |
386 | int ret, transferred, message_size; | |
387 | ||
388 | ret = libusb_bulk_transfer(usb->devhdl, uscpi->bulk_in_ep, data, size, | |
389 | &transferred, TRANSFER_TIMEOUT); | |
390 | if (ret) { | |
391 | sr_err("USBTMC bulk in transfer error: %d", ret); | |
392 | return SR_ERR; | |
393 | } | |
394 | ||
395 | if (usbtmc_bulk_in_header_read(data, msg_id, uscpi->bTag, &message_size, | |
396 | transfer_attributes) != SR_OK) { | |
397 | sr_err("USBTMC invalid bulk in header"); | |
398 | return SR_ERR; | |
399 | } | |
400 | ||
401 | message_size += USBTMC_BULK_HEADER_SIZE; | |
402 | uscpi->response_length = MIN(transferred, message_size); | |
403 | uscpi->response_bytes_read = USBTMC_BULK_HEADER_SIZE; | |
404 | uscpi->remaining_length = message_size - uscpi->response_length; | |
405 | ||
406 | return transferred - USBTMC_BULK_HEADER_SIZE; | |
407 | } | |
408 | ||
409 | static int scpi_usbtmc_bulkin_continue(struct scpi_usbtmc_libusb *uscpi, | |
410 | void *data, int size) | |
411 | { | |
412 | struct sr_usb_dev_inst *usb = uscpi->usb; | |
413 | int ret, transferred; | |
414 | ||
415 | ret = libusb_bulk_transfer(usb->devhdl, uscpi->bulk_in_ep, data, size, | |
416 | &transferred, TRANSFER_TIMEOUT); | |
417 | if (ret) { | |
418 | sr_err("USBTMC bulk in transfer error: %d", ret); | |
419 | return SR_ERR; | |
420 | } | |
421 | ||
422 | uscpi->response_length = MIN(transferred, uscpi->remaining_length); | |
423 | uscpi->response_bytes_read = 0; | |
424 | uscpi->remaining_length -= uscpi->response_length; | |
425 | ||
426 | return transferred; | |
427 | } | |
428 | ||
429 | static int scpi_usbtmc_libusb_send(void *priv, const char *command) | |
430 | { | |
431 | struct scpi_usbtmc_libusb *uscpi = priv; | |
432 | ||
433 | if (scpi_usbtmc_bulkout(uscpi, DEV_DEP_MSG_OUT, | |
434 | command, strlen(command), EOM) <= 0) | |
435 | return SR_ERR; | |
436 | ||
437 | sr_spew("Successfully sent SCPI command: '%s'.", command); | |
438 | ||
439 | return SR_OK; | |
440 | } | |
441 | ||
442 | static int scpi_usbtmc_libusb_read_begin(void *priv) | |
443 | { | |
444 | struct scpi_usbtmc_libusb *uscpi = priv; | |
445 | ||
446 | uscpi->remaining_length = 0; | |
447 | ||
448 | if (scpi_usbtmc_bulkout(uscpi, REQUEST_DEV_DEP_MSG_IN, | |
449 | NULL, INT32_MAX, 0) < 0) | |
450 | return SR_ERR; | |
451 | if (scpi_usbtmc_bulkin_start(uscpi, DEV_DEP_MSG_IN, | |
452 | uscpi->buffer, sizeof(uscpi->buffer), | |
453 | &uscpi->bulkin_attributes) < 0) | |
454 | return SR_ERR; | |
455 | ||
456 | return SR_OK; | |
457 | } | |
458 | ||
459 | static int scpi_usbtmc_libusb_read_data(void *priv, char *buf, int maxlen) | |
460 | { | |
461 | struct scpi_usbtmc_libusb *uscpi = priv; | |
462 | int read_length; | |
463 | ||
464 | if (uscpi->response_bytes_read >= uscpi->response_length) { | |
465 | if (uscpi->remaining_length > 0) { | |
466 | if (scpi_usbtmc_bulkin_continue(uscpi, uscpi->buffer, | |
467 | sizeof(uscpi->buffer)) <= 0) | |
468 | return SR_ERR; | |
469 | } else { | |
470 | if (uscpi->bulkin_attributes & EOM) | |
471 | return SR_ERR; | |
472 | if (scpi_usbtmc_libusb_read_begin(uscpi) < 0) | |
473 | return SR_ERR; | |
474 | } | |
475 | } | |
476 | ||
477 | read_length = MIN(uscpi->response_length - uscpi->response_bytes_read, maxlen); | |
478 | ||
479 | memcpy(buf, uscpi->buffer + uscpi->response_bytes_read, read_length); | |
480 | ||
481 | uscpi->response_bytes_read += read_length; | |
482 | ||
483 | return read_length; | |
484 | } | |
485 | ||
486 | static int scpi_usbtmc_libusb_read_complete(void *priv) | |
487 | { | |
488 | struct scpi_usbtmc_libusb *uscpi = priv; | |
489 | return uscpi->response_bytes_read >= uscpi->response_length && | |
490 | uscpi->remaining_length <= 0 && | |
491 | uscpi->bulkin_attributes & EOM; | |
492 | } | |
493 | ||
494 | static int scpi_usbtmc_libusb_close(void *priv) | |
495 | { | |
496 | struct scpi_usbtmc_libusb *uscpi = priv; | |
497 | struct sr_usb_dev_inst *usb = uscpi->usb; | |
498 | ||
499 | if (!usb->devhdl) | |
500 | return SR_ERR; | |
501 | ||
502 | libusb_clear_halt(usb->devhdl, uscpi->bulk_in_ep); | |
503 | libusb_clear_halt(usb->devhdl, uscpi->bulk_out_ep); | |
504 | libusb_clear_halt(usb->devhdl, uscpi->interrupt_ep); | |
505 | libusb_release_interface(usb->devhdl, uscpi->interface); | |
506 | if (uscpi->detached_kernel_driver) { | |
507 | libusb_attach_kernel_driver(usb->devhdl, uscpi->interface); | |
508 | uscpi->detached_kernel_driver = 0; | |
509 | } | |
510 | libusb_close(usb->devhdl); | |
511 | usb->devhdl = NULL; | |
512 | ||
513 | return SR_OK; | |
514 | } | |
515 | ||
516 | static void scpi_usbtmc_libusb_free(void *priv) | |
517 | { | |
518 | struct scpi_usbtmc_libusb *uscpi = priv; | |
519 | sr_usb_dev_inst_free(uscpi->usb); | |
520 | } | |
521 | ||
522 | ||
523 | SR_PRIV const struct sr_scpi_dev_inst scpi_usbtmc_libusb_dev = { | |
524 | .name = "USBTMC", | |
525 | .prefix = "usbtmc", | |
526 | .priv_size = sizeof(struct scpi_usbtmc_libusb), | |
527 | .scan = scpi_usbtmc_libusb_scan, | |
528 | .dev_inst_new = scpi_usbtmc_libusb_dev_inst_new, | |
529 | .open = scpi_usbtmc_libusb_open, | |
530 | .source_add = scpi_usbtmc_libusb_source_add, | |
531 | .source_remove = scpi_usbtmc_libusb_source_remove, | |
532 | .send = scpi_usbtmc_libusb_send, | |
533 | .read_begin = scpi_usbtmc_libusb_read_begin, | |
534 | .read_data = scpi_usbtmc_libusb_read_data, | |
535 | .read_complete = scpi_usbtmc_libusb_read_complete, | |
536 | .close = scpi_usbtmc_libusb_close, | |
537 | .free = scpi_usbtmc_libusb_free, | |
538 | }; |