1 /*
2 * This file is part of the libsigrok project.
3 *
4 * Copyright (C) 2013 Marc Schink <sigrok-dev@marcschink.de>
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 <config.h>
21 #include "protocol.h"
22
23 extern uint64_t sl2_samplerates[NUM_SAMPLERATES];
24
stop_acquisition(struct sr_dev_inst * sdi)25 static void stop_acquisition(struct sr_dev_inst *sdi)
26 {
27 struct drv_context *drvc = sdi->driver->context;
28
29 usb_source_remove(sdi->session, drvc->sr_ctx);
30
31 std_session_send_df_end(sdi);
32
33 sdi->status = SR_ST_ACTIVE;
34 }
35
abort_acquisition(struct sr_dev_inst * sdi)36 static void abort_acquisition(struct sr_dev_inst *sdi)
37 {
38 struct drv_context *drvc = sdi->driver->context;
39
40 usb_source_remove(sdi->session, drvc->sr_ctx);
41
42 std_session_send_df_end(sdi);
43
44 sr_dev_close(sdi);
45 }
46
buffer_sample_data(const struct sr_dev_inst * sdi)47 static void buffer_sample_data(const struct sr_dev_inst *sdi)
48 {
49 struct dev_context *devc;
50 unsigned int offset, packet_length;
51
52 devc = sdi->priv;
53
54 if (devc->channels[devc->channel]->enabled) {
55 offset = devc->sample_packet * PACKET_NUM_SAMPLE_BYTES;
56
57 /*
58 * Determine the packet length to ensure that the last packet
59 * will not exceed the buffer size.
60 */
61 packet_length = MIN(PACKET_NUM_SAMPLE_BYTES,
62 MAX_DEV_SAMPLE_BYTES - offset);
63
64 /*
65 * Skip the first 4 bytes of the source buffer because they
66 * contain channel and packet information only.
67 */
68 memcpy(devc->sample_buffer[devc->channel] + offset,
69 devc->xfer_data_in + 4, packet_length);
70 }
71 }
72
process_sample_data(const struct sr_dev_inst * sdi)73 static void process_sample_data(const struct sr_dev_inst *sdi)
74 {
75 struct dev_context *devc;
76 struct sr_datafeed_packet packet;
77 struct sr_datafeed_logic logic;
78 uint8_t i, j, tmp, buffer[PACKET_NUM_SAMPLES], *ptr[NUM_CHANNELS];
79 uint16_t offset, n = 0;
80 int8_t k;
81
82 devc = sdi->priv;
83 offset = devc->sample_packet * PACKET_NUM_SAMPLE_BYTES;
84
85 /*
86 * Array of pointers to the sample data of all channels up to the last
87 * enabled one for an uniform access to them. Note that the currently
88 * received samples always belong to the last enabled channel.
89 */
90 for (i = 0; i < devc->num_enabled_channels - 1; i++)
91 ptr[i] = devc->sample_buffer[devc->channel_map[i]] + offset;
92
93 /*
94 * Skip the first 4 bytes of the buffer because they contain channel
95 * and packet information only.
96 */
97 ptr[i] = devc->xfer_data_in + 4;
98
99 for (i = 0; i < PACKET_NUM_SAMPLE_BYTES; i++) {
100 /* Stop processing if all requested samples are processed. */
101 if (devc->samples_processed == devc->limit_samples)
102 break;
103
104 k = 7;
105
106 if (devc->samples_processed == 0) {
107 /*
108 * Adjust the position of the first sample to be
109 * processed because possibly more samples than
110 * necessary might have been acquired. This is because
111 * the number of acquired samples is always rounded up
112 * to a multiple of 8.
113 */
114 k = k - (devc->pre_trigger_bytes * 8) +
115 devc->pre_trigger_samples;
116
117 sr_dbg("Start processing at sample: %d.", 7 - k);
118
119 /*
120 * Send the trigger before the first sample is
121 * processed if no pre trigger samples were calculated
122 * through the capture ratio.
123 */
124 if (devc->trigger_type != TRIGGER_TYPE_NONE &&
125 devc->pre_trigger_samples == 0) {
126 packet.type = SR_DF_TRIGGER;
127 sr_session_send(sdi, &packet);
128 }
129 }
130
131 for (; k >= 0; k--) {
132 /*
133 * Stop processing if all requested samples are
134 * processed.
135 */
136 if (devc->samples_processed == devc->limit_samples)
137 break;
138
139 buffer[n] = 0;
140
141 /*
142 * Extract the current sample for each enabled channel
143 * and store them in the buffer.
144 */
145 for (j = 0; j < devc->num_enabled_channels; j++) {
146 tmp = (ptr[j][i] & (1 << k)) >> k;
147 buffer[n] |= tmp << devc->channel_map[j];
148 }
149
150 n++;
151 devc->samples_processed++;
152
153 /*
154 * Send all processed samples and the trigger if the
155 * number of processed samples reaches the calculated
156 * number of pre trigger samples.
157 */
158 if (devc->samples_processed == devc->pre_trigger_samples &&
159 devc->trigger_type != TRIGGER_TYPE_NONE) {
160 packet.type = SR_DF_LOGIC;
161 packet.payload = &logic;
162 logic.length = n;
163 logic.unitsize = 1;
164 logic.data = buffer;
165 sr_session_send(sdi, &packet);
166
167 packet.type = SR_DF_TRIGGER;
168 sr_session_send(sdi, &packet);
169
170 n = 0;
171 }
172 }
173 }
174
175 if (n > 0) {
176 packet.type = SR_DF_LOGIC;
177 packet.payload = &logic;
178 logic.length = n;
179 logic.unitsize = 1;
180 logic.data = buffer;
181 sr_session_send(sdi, &packet);
182 }
183 }
184
ikalogic_scanalogic2_receive_data(int fd,int revents,void * cb_data)185 SR_PRIV int ikalogic_scanalogic2_receive_data(int fd, int revents, void *cb_data)
186 {
187 struct sr_dev_inst *sdi;
188 struct sr_dev_driver *di;
189 struct dev_context *devc;
190 struct drv_context *drvc;
191 struct timeval tv;
192 int64_t current_time, time_elapsed;
193 int ret = 0;
194
195 (void)fd;
196 (void)revents;
197
198 if (!(sdi = cb_data))
199 return TRUE;
200
201 if (!(devc = sdi->priv))
202 return TRUE;
203
204 di = sdi->driver;
205 drvc = di->context;
206 current_time = g_get_monotonic_time();
207
208 if (devc->state == STATE_WAIT_DATA_READY &&
209 !devc->wait_data_ready_locked) {
210 time_elapsed = current_time - devc->wait_data_ready_time;
211
212 /*
213 * Check here for stopping in addition to the transfer
214 * callback functions to avoid waiting until the
215 * WAIT_DATA_READY_INTERVAL has expired.
216 */
217 if (sdi->status == SR_ST_STOPPING) {
218 if (!devc->stopping_in_progress) {
219 devc->next_state = STATE_RESET_AND_IDLE;
220 devc->stopping_in_progress = TRUE;
221 ret = libusb_submit_transfer(devc->xfer_in);
222 }
223 } else if (time_elapsed >= WAIT_DATA_READY_INTERVAL) {
224 devc->wait_data_ready_locked = TRUE;
225 ret = libusb_submit_transfer(devc->xfer_in);
226 }
227 }
228
229 if (ret != 0) {
230 sr_err("Submit transfer failed: %s.", libusb_error_name(ret));
231 abort_acquisition(sdi);
232 return TRUE;
233 }
234
235 tv.tv_sec = 0;
236 tv.tv_usec = 0;
237
238 libusb_handle_events_timeout_completed(drvc->sr_ctx->libusb_ctx, &tv,
239 NULL);
240
241 /* Check if an error occurred on a transfer. */
242 if (devc->transfer_error)
243 abort_acquisition(sdi);
244
245 return TRUE;
246 }
247
sl2_receive_transfer_in(struct libusb_transfer * transfer)248 SR_PRIV void LIBUSB_CALL sl2_receive_transfer_in( struct libusb_transfer *transfer)
249 {
250 struct sr_dev_inst *sdi;
251 struct dev_context *devc;
252 uint8_t last_channel;
253 int ret = 0;
254
255 sdi = transfer->user_data;
256 devc = sdi->priv;
257
258 if (transfer->status != LIBUSB_TRANSFER_COMPLETED) {
259 sr_err("Transfer to device failed: %s.",
260 libusb_error_name(transfer->status));
261 devc->transfer_error = TRUE;
262 return;
263 }
264
265 if (sdi->status == SR_ST_STOPPING && !devc->stopping_in_progress) {
266 devc->next_state = STATE_RESET_AND_IDLE;
267 devc->stopping_in_progress = TRUE;
268
269 if (libusb_submit_transfer(devc->xfer_in) != 0) {
270 sr_err("Submit transfer failed: %s.",
271 libusb_error_name(ret));
272 devc->transfer_error = TRUE;
273 }
274
275 return;
276 }
277
278 if (devc->state != devc->next_state)
279 sr_spew("State changed from %i to %i.",
280 devc->state, devc->next_state);
281 devc->state = devc->next_state;
282
283 if (devc->state == STATE_WAIT_DATA_READY) {
284 /* Check if the received data are a valid device status. */
285 if (devc->xfer_data_in[0] == 0x05) {
286 if (devc->xfer_data_in[1] == STATUS_WAITING_FOR_TRIGGER)
287 sr_dbg("Waiting for trigger.");
288 else if (devc->xfer_data_in[1] == STATUS_SAMPLING)
289 sr_dbg("Sampling in progress.");
290 }
291
292 /*
293 * Check if the received data are a valid device status and the
294 * sample data are ready.
295 */
296 if (devc->xfer_data_in[0] == 0x05 &&
297 devc->xfer_data_in[1] == STATUS_DATA_READY) {
298 devc->next_state = STATE_RECEIVE_DATA;
299 ret = libusb_submit_transfer(transfer);
300 } else {
301 devc->wait_data_ready_locked = FALSE;
302 devc->wait_data_ready_time = g_get_monotonic_time();
303 }
304 } else if (devc->state == STATE_RECEIVE_DATA) {
305 last_channel = devc->channel_map[devc->num_enabled_channels - 1];
306
307 if (devc->channel < last_channel) {
308 buffer_sample_data(sdi);
309 } else if (devc->channel == last_channel) {
310 process_sample_data(sdi);
311 } else {
312 /*
313 * Stop acquisition because all samples of enabled
314 * channels are processed.
315 */
316 devc->next_state = STATE_RESET_AND_IDLE;
317 }
318
319 devc->sample_packet++;
320 devc->sample_packet %= devc->num_sample_packets;
321
322 if (devc->sample_packet == 0)
323 devc->channel++;
324
325 ret = libusb_submit_transfer(transfer);
326 } else if (devc->state == STATE_RESET_AND_IDLE) {
327 /* Check if the received data are a valid device status. */
328 if (devc->xfer_data_in[0] == 0x05) {
329 if (devc->xfer_data_in[1] == STATUS_DEVICE_READY) {
330 devc->next_state = STATE_IDLE;
331 devc->xfer_data_out[0] = CMD_IDLE;
332 } else {
333 devc->next_state = STATE_WAIT_DEVICE_READY;
334 devc->xfer_data_out[0] = CMD_RESET;
335 }
336
337 ret = libusb_submit_transfer(devc->xfer_out);
338 } else {
339 /*
340 * The received device status is invalid which
341 * indicates that the device is not ready to accept
342 * commands. Request a new device status until a valid
343 * device status is received.
344 */
345 ret = libusb_submit_transfer(transfer);
346 }
347 } else if (devc->state == STATE_WAIT_DEVICE_READY) {
348 /* Check if the received data are a valid device status. */
349 if (devc->xfer_data_in[0] == 0x05) {
350 if (devc->xfer_data_in[1] == STATUS_DEVICE_READY) {
351 devc->next_state = STATE_IDLE;
352 devc->xfer_data_out[0] = CMD_IDLE;
353 } else {
354 /*
355 * The received device status is valid but the
356 * device is not ready. Probably the device did
357 * not recognize the last reset. Reset the
358 * device again.
359 */
360 devc->xfer_data_out[0] = CMD_RESET;
361 }
362
363 ret = libusb_submit_transfer(devc->xfer_out);
364 } else {
365 /*
366 * The device is not ready and therefore not able to
367 * change to the idle state. Request a new device
368 * status until the device is ready.
369 */
370 ret = libusb_submit_transfer(transfer);
371 }
372 }
373
374 if (ret != 0) {
375 sr_err("Submit transfer failed: %s.", libusb_error_name(ret));
376 devc->transfer_error = TRUE;
377 }
378 }
379
sl2_receive_transfer_out(struct libusb_transfer * transfer)380 SR_PRIV void LIBUSB_CALL sl2_receive_transfer_out( struct libusb_transfer *transfer)
381 {
382 struct sr_dev_inst *sdi;
383 struct dev_context *devc;
384 int ret = 0;
385
386 sdi = transfer->user_data;
387 devc = sdi->priv;
388
389 if (transfer->status != LIBUSB_TRANSFER_COMPLETED) {
390 sr_err("Transfer to device failed: %s.",
391 libusb_error_name(transfer->status));
392 devc->transfer_error = TRUE;
393 return;
394 }
395
396 if (sdi->status == SR_ST_STOPPING && !devc->stopping_in_progress) {
397 devc->next_state = STATE_RESET_AND_IDLE;
398 devc->stopping_in_progress = TRUE;
399
400 if (libusb_submit_transfer(devc->xfer_in) != 0) {
401 sr_err("Submit transfer failed: %s.",
402 libusb_error_name(ret));
403
404 devc->transfer_error = TRUE;
405 }
406
407 return;
408 }
409
410 if (devc->state != devc->next_state)
411 sr_spew("State changed from %i to %i.",
412 devc->state, devc->next_state);
413 devc->state = devc->next_state;
414
415 if (devc->state == STATE_IDLE) {
416 stop_acquisition(sdi);
417 } else if (devc->state == STATE_SAMPLE) {
418 devc->next_state = STATE_WAIT_DATA_READY;
419 ret = libusb_submit_transfer(devc->xfer_in);
420 } else if (devc->state == STATE_WAIT_DEVICE_READY) {
421 ret = libusb_submit_transfer(devc->xfer_in);
422 }
423
424 if (ret != 0) {
425 sr_err("Submit transfer failed: %s.", libusb_error_name(ret));
426 devc->transfer_error = TRUE;
427 }
428 }
429
sl2_set_samplerate(const struct sr_dev_inst * sdi,uint64_t samplerate)430 SR_PRIV int sl2_set_samplerate(const struct sr_dev_inst *sdi,
431 uint64_t samplerate)
432 {
433 struct dev_context *devc;
434 unsigned int i;
435
436 devc = sdi->priv;
437
438 for (i = 0; i < NUM_SAMPLERATES; i++) {
439 if (sl2_samplerates[i] == samplerate) {
440 devc->samplerate = samplerate;
441 devc->samplerate_id = NUM_SAMPLERATES - i - 1;
442 return SR_OK;
443 }
444 }
445
446 return SR_ERR_ARG;
447 }
448
sl2_set_limit_samples(const struct sr_dev_inst * sdi,uint64_t limit_samples)449 SR_PRIV int sl2_set_limit_samples(const struct sr_dev_inst *sdi,
450 uint64_t limit_samples)
451 {
452 struct dev_context *devc;
453
454 devc = sdi->priv;
455
456 if (limit_samples == 0) {
457 sr_err("Invalid number of limit samples: %" PRIu64 ".",
458 limit_samples);
459 return SR_ERR_ARG;
460 }
461
462 if (limit_samples > MAX_SAMPLES)
463 limit_samples = MAX_SAMPLES;
464
465 sr_dbg("Limit samples set to %" PRIu64 ".", limit_samples);
466
467 devc->limit_samples = limit_samples;
468
469 return SR_OK;
470 }
471
sl2_convert_trigger(const struct sr_dev_inst * sdi)472 SR_PRIV int sl2_convert_trigger(const struct sr_dev_inst *sdi)
473 {
474 struct dev_context *devc;
475 struct sr_trigger *trigger;
476 struct sr_trigger_stage *stage;
477 struct sr_trigger_match *match;
478 const GSList *l, *m;
479 int num_triggers_anyedge;
480
481 devc = sdi->priv;
482
483 /* Disable the trigger by default. */
484 devc->trigger_channel = TRIGGER_CHANNEL_0;
485 devc->trigger_type = TRIGGER_TYPE_NONE;
486
487 if (!(trigger = sr_session_trigger_get(sdi->session)))
488 return SR_OK;
489
490 if (g_slist_length(trigger->stages) > 1) {
491 sr_err("This device only supports 1 trigger stage.");
492 return SR_ERR;
493 }
494
495 num_triggers_anyedge = 0;
496 for (l = trigger->stages; l; l = l->next) {
497 stage = l->data;
498 for (m = stage->matches; m; m = m->next) {
499 match = m->data;
500 if (!match->channel->enabled)
501 /* Ignore disabled channels with a trigger. */
502 continue;
503 devc->trigger_channel = match->channel->index + 1;
504 switch (match->match) {
505 case SR_TRIGGER_RISING:
506 devc->trigger_type = TRIGGER_TYPE_POSEDGE;
507 break;
508 case SR_TRIGGER_FALLING:
509 devc->trigger_type = TRIGGER_TYPE_NEGEDGE;
510 break;
511 case SR_TRIGGER_EDGE:
512 devc->trigger_type = TRIGGER_TYPE_ANYEDGE;
513 num_triggers_anyedge++;
514 break;
515 }
516 }
517 }
518
519 /*
520 * Set trigger to any edge on all channels if the trigger for each
521 * channel is set to any edge.
522 */
523 if (num_triggers_anyedge == NUM_CHANNELS) {
524 devc->trigger_channel = TRIGGER_CHANNEL_ALL;
525 devc->trigger_type = TRIGGER_TYPE_ANYEDGE;
526 }
527
528 sr_dbg("Trigger set to channel 0x%02x and type 0x%02x.",
529 devc->trigger_channel, devc->trigger_type);
530
531 return SR_OK;
532 }
533
sl2_set_after_trigger_delay(const struct sr_dev_inst * sdi,uint64_t after_trigger_delay)534 SR_PRIV int sl2_set_after_trigger_delay(const struct sr_dev_inst *sdi,
535 uint64_t after_trigger_delay)
536 {
537 struct dev_context *devc;
538
539 devc = sdi->priv;
540
541 if (after_trigger_delay > MAX_AFTER_TRIGGER_DELAY) {
542 sr_err("Invalid after trigger delay: %" PRIu64 " ms.",
543 after_trigger_delay);
544 return SR_ERR_ARG;
545 }
546
547 sr_info("After trigger delay set to %" PRIu64 " ms.",
548 after_trigger_delay);
549
550 devc->after_trigger_delay = after_trigger_delay;
551
552 return SR_OK;
553 }
554
sl2_calculate_trigger_samples(const struct sr_dev_inst * sdi)555 SR_PRIV void sl2_calculate_trigger_samples(const struct sr_dev_inst *sdi)
556 {
557 struct dev_context *devc;
558 uint64_t pre_trigger_samples, post_trigger_samples;
559 uint16_t pre_trigger_bytes, post_trigger_bytes;
560 uint8_t cr;
561
562 devc = sdi->priv;
563 cr = devc->capture_ratio;
564
565 /* Ignore the capture ratio if no trigger is enabled. */
566 if (devc->trigger_type == TRIGGER_TYPE_NONE)
567 cr = 0;
568
569 pre_trigger_samples = (devc->limit_samples * cr) / 100;
570 post_trigger_samples = (devc->limit_samples * (100 - cr)) / 100;
571
572 /*
573 * Increase the number of post trigger samples by one to compensate the
574 * possible loss of a sample through integer rounding.
575 */
576 if (pre_trigger_samples + post_trigger_samples != devc->limit_samples)
577 post_trigger_samples++;
578
579 /*
580 * The device requires the number of samples in multiples of 8 which
581 * will also be called sample bytes in the following.
582 */
583 pre_trigger_bytes = pre_trigger_samples / 8;
584 post_trigger_bytes = post_trigger_samples / 8;
585
586 /*
587 * Round up the number of sample bytes to ensure that at least the
588 * requested number of samples will be acquired. Note that due to this
589 * rounding the buffer to store these sample bytes needs to be at least
590 * one sample byte larger than the minimal number of sample bytes
591 * needed to store the requested samples.
592 */
593 if (pre_trigger_samples % 8 != 0)
594 pre_trigger_bytes++;
595
596 if (post_trigger_samples % 8 != 0)
597 post_trigger_bytes++;
598
599 sr_info("Pre trigger samples: %" PRIu64 ".", pre_trigger_samples);
600 sr_info("Post trigger samples: %" PRIu64 ".", post_trigger_samples);
601 sr_dbg("Pre trigger sample bytes: %" PRIu16 ".", pre_trigger_bytes);
602 sr_dbg("Post trigger sample bytes: %" PRIu16 ".", post_trigger_bytes);
603
604 devc->pre_trigger_samples = pre_trigger_samples;
605 devc->pre_trigger_bytes = pre_trigger_bytes;
606 devc->post_trigger_bytes = post_trigger_bytes;
607 }
608
sl2_get_device_info(struct sr_dev_driver * di,struct sr_usb_dev_inst usb,struct device_info * dev_info)609 SR_PRIV int sl2_get_device_info(struct sr_dev_driver *di,
610 struct sr_usb_dev_inst usb, struct device_info *dev_info)
611 {
612 struct drv_context *drvc;
613 uint8_t buffer[PACKET_LENGTH];
614 int ret;
615
616 drvc = di->context;
617
618 if (!dev_info)
619 return SR_ERR_ARG;
620
621 if (sr_usb_open(drvc->sr_ctx->libusb_ctx, &usb) != SR_OK)
622 return SR_ERR;
623
624 if (libusb_kernel_driver_active(usb.devhdl, USB_INTERFACE) == 1) {
625 ret = libusb_detach_kernel_driver(usb.devhdl,
626 USB_INTERFACE);
627
628 if (ret < 0) {
629 sr_err("Failed to detach kernel driver: %s.",
630 libusb_error_name(ret));
631 libusb_close(usb.devhdl);
632 return SR_ERR;
633 }
634 }
635
636 ret = libusb_claim_interface(usb.devhdl, USB_INTERFACE);
637
638 if (ret) {
639 sr_err("Failed to claim interface: %s.",
640 libusb_error_name(ret));
641 libusb_close(usb.devhdl);
642 return SR_ERR;
643 }
644
645 memset(buffer, 0, sizeof(buffer));
646
647 /*
648 * Reset the device to ensure it is in a proper state to request the
649 * device information.
650 */
651 buffer[0] = CMD_RESET;
652 if ((ret = sl2_transfer_out(usb.devhdl, buffer)) != PACKET_LENGTH) {
653 sr_err("Resetting of device failed: %s.",
654 libusb_error_name(ret));
655 libusb_release_interface(usb.devhdl, USB_INTERFACE);
656 libusb_close(usb.devhdl);
657 return SR_ERR;
658 }
659
660 buffer[0] = CMD_INFO;
661 if ((ret = sl2_transfer_out(usb.devhdl, buffer)) != PACKET_LENGTH) {
662 sr_err("Requesting of device information failed: %s.",
663 libusb_error_name(ret));
664 libusb_release_interface(usb.devhdl, USB_INTERFACE);
665 libusb_close(usb.devhdl);
666 return SR_ERR;
667 }
668
669 if ((ret = sl2_transfer_in(usb.devhdl, buffer)) != PACKET_LENGTH) {
670 sr_err("Receiving of device information failed: %s.",
671 libusb_error_name(ret));
672 libusb_release_interface(usb.devhdl, USB_INTERFACE);
673 libusb_close(usb.devhdl);
674 return SR_ERR;
675 }
676
677 memcpy(&(dev_info->serial), buffer + 1, sizeof(uint32_t));
678 dev_info->serial = GUINT32_FROM_LE(dev_info->serial);
679
680 dev_info->fw_ver_major = buffer[5];
681 dev_info->fw_ver_minor = buffer[6];
682
683 buffer[0] = CMD_RESET;
684 if ((ret = sl2_transfer_out(usb.devhdl, buffer)) != PACKET_LENGTH) {
685 sr_err("Device reset failed: %s.", libusb_error_name(ret));
686 libusb_release_interface(usb.devhdl, USB_INTERFACE);
687 libusb_close(usb.devhdl);
688 return SR_ERR;
689 }
690
691 /*
692 * Set the device to idle state. If the device is not in idle state it
693 * possibly will reset itself after a few seconds without being used
694 * and thereby close the connection.
695 */
696 buffer[0] = CMD_IDLE;
697 if ((ret = sl2_transfer_out(usb.devhdl, buffer)) != PACKET_LENGTH) {
698 sr_err("Failed to set device in idle state: %s.",
699 libusb_error_name(ret));
700 libusb_release_interface(usb.devhdl, USB_INTERFACE);
701 libusb_close(usb.devhdl);
702 return SR_ERR;
703 }
704
705 ret = libusb_release_interface(usb.devhdl, USB_INTERFACE);
706
707 if (ret < 0) {
708 sr_err("Failed to release interface: %s.",
709 libusb_error_name(ret));
710 libusb_close(usb.devhdl);
711 return SR_ERR;
712 }
713
714 libusb_close(usb.devhdl);
715
716 return SR_OK;
717 }
718
sl2_transfer_in(libusb_device_handle * dev_handle,uint8_t * data)719 SR_PRIV int sl2_transfer_in(libusb_device_handle *dev_handle, uint8_t *data)
720 {
721 return libusb_control_transfer(dev_handle, USB_REQUEST_TYPE_IN,
722 USB_HID_GET_REPORT, USB_HID_REPORT_TYPE_FEATURE, USB_INTERFACE,
723 (unsigned char *)data, PACKET_LENGTH, USB_TIMEOUT_MS);
724 }
725
sl2_transfer_out(libusb_device_handle * dev_handle,uint8_t * data)726 SR_PRIV int sl2_transfer_out(libusb_device_handle *dev_handle, uint8_t *data)
727 {
728 return libusb_control_transfer(dev_handle, USB_REQUEST_TYPE_OUT,
729 USB_HID_SET_REPORT, USB_HID_REPORT_TYPE_FEATURE, USB_INTERFACE,
730 (unsigned char *)data, PACKET_LENGTH, USB_TIMEOUT_MS);
731 }
732