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1/*
2 * This file is part of the sigrok project.
3 *
4 * Copyright (C) 2010-2012 Bert Vermeulen <bert@biot.com>
5 * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
6 *
7 * This program is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 3 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
19 */
20
21#include <stdio.h>
22#include <stdlib.h>
23#include <string.h>
24#include <inttypes.h>
25#include <libusb.h>
26#include "libsigrok.h"
27#include "libsigrok-internal.h"
28#include "fx2lafw.h"
29#include "command.h"
30
31static const struct fx2lafw_profile supported_fx2[] = {
32 /*
33 * CWAV USBee AX
34 * EE Electronics ESLA201A
35 * ARMFLY AX-Pro
36 */
37 { 0x08a9, 0x0014, "CWAV", "USBee AX", NULL,
38 FIRMWARE_DIR "/fx2lafw-cwav-usbeeax.fw",
39 0 },
40 /*
41 * CWAV USBee DX
42 * XZL-Studio DX
43 */
44 { 0x08a9, 0x0015, "CWAV", "USBee DX", NULL,
45 FIRMWARE_DIR "/fx2lafw-cwav-usbeedx.fw",
46 DEV_CAPS_16BIT },
47
48 /*
49 * CWAV USBee SX
50 */
51 { 0x08a9, 0x0009, "CWAV", "USBee SX", NULL,
52 FIRMWARE_DIR "/fx2lafw-cwav-usbeesx.fw",
53 0 },
54
55 /*
56 * Saleae Logic
57 * EE Electronics ESLA100
58 * Robomotic MiniLogic
59 * Robomotic BugLogic 3
60 */
61 { 0x0925, 0x3881, "Saleae", "Logic", NULL,
62 FIRMWARE_DIR "/fx2lafw-saleae-logic.fw",
63 0 },
64
65 /*
66 * Default Cypress FX2 without EEPROM, e.g.:
67 * Lcsoft Mini Board
68 * Braintechnology USB Interface V2.x
69 */
70 { 0x04B4, 0x8613, "Cypress", "FX2", NULL,
71 FIRMWARE_DIR "/fx2lafw-cypress-fx2.fw",
72 DEV_CAPS_16BIT },
73
74 /*
75 * Braintechnology USB-LPS
76 */
77 { 0x16d0, 0x0498, "Braintechnology", "USB-LPS", NULL,
78 FIRMWARE_DIR "/fx2lafw-braintechnology-usb-lps.fw",
79 DEV_CAPS_16BIT },
80
81 { 0, 0, 0, 0, 0, 0, 0 }
82};
83
84static const int hwcaps[] = {
85 SR_CONF_LOGIC_ANALYZER,
86 SR_CONF_SAMPLERATE,
87
88 /* These are really implemented in the driver, not the hardware. */
89 SR_CONF_LIMIT_SAMPLES,
90 SR_CONF_CONTINUOUS,
91 0,
92};
93
94static const char *probe_names[] = {
95 "0", "1", "2", "3", "4", "5", "6", "7",
96 "8", "9", "10", "11", "12", "13", "14", "15",
97 NULL,
98};
99
100static const uint64_t supported_samplerates[] = {
101 SR_KHZ(20),
102 SR_KHZ(25),
103 SR_KHZ(50),
104 SR_KHZ(100),
105 SR_KHZ(200),
106 SR_KHZ(250),
107 SR_KHZ(500),
108 SR_MHZ(1),
109 SR_MHZ(2),
110 SR_MHZ(3),
111 SR_MHZ(4),
112 SR_MHZ(6),
113 SR_MHZ(8),
114 SR_MHZ(12),
115 SR_MHZ(16),
116 SR_MHZ(24),
117 0,
118};
119
120static const struct sr_samplerates samplerates = {
121 0,
122 0,
123 0,
124 supported_samplerates,
125};
126
127SR_PRIV struct sr_dev_driver fx2lafw_driver_info;
128static struct sr_dev_driver *di = &fx2lafw_driver_info;
129static int hw_dev_close(struct sr_dev_inst *sdi);
130static int config_set(int id, const void *value, const struct sr_dev_inst *sdi);
131static int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data);
132
133/**
134 * Check the USB configuration to determine if this is an fx2lafw device.
135 *
136 * @return TRUE if the device's configuration profile match fx2lafw
137 * configuration, FALSE otherwise.
138 */
139static gboolean check_conf_profile(libusb_device *dev)
140{
141 struct libusb_device_descriptor des;
142 struct libusb_device_handle *hdl;
143 gboolean ret;
144 unsigned char strdesc[64];
145
146 hdl = NULL;
147 ret = FALSE;
148 while (!ret) {
149 /* Assume the FW has not been loaded, unless proven wrong. */
150 if (libusb_get_device_descriptor(dev, &des) != 0)
151 break;
152
153 if (libusb_open(dev, &hdl) != 0)
154 break;
155
156 if (libusb_get_string_descriptor_ascii(hdl,
157 des.iManufacturer, strdesc, sizeof(strdesc)) < 0)
158 break;
159 if (strncmp((const char *)strdesc, "sigrok", 6))
160 break;
161
162 if (libusb_get_string_descriptor_ascii(hdl,
163 des.iProduct, strdesc, sizeof(strdesc)) < 0)
164 break;
165 if (strncmp((const char *)strdesc, "fx2lafw", 7))
166 break;
167
168 /* If we made it here, it must be an fx2lafw. */
169 ret = TRUE;
170 }
171 if (hdl)
172 libusb_close(hdl);
173
174 return ret;
175}
176
177static int fx2lafw_dev_open(struct sr_dev_inst *sdi)
178{
179 libusb_device **devlist;
180 struct libusb_device_descriptor des;
181 struct dev_context *devc;
182 struct drv_context *drvc;
183 struct version_info vi;
184 int ret, skip, i, device_count;
185 uint8_t revid;
186
187 drvc = di->priv;
188 devc = sdi->priv;
189
190 if (sdi->status == SR_ST_ACTIVE)
191 /* Device is already in use. */
192 return SR_ERR;
193
194 skip = 0;
195 device_count = libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
196 if (device_count < 0) {
197 sr_err("Failed to get device list: %s.",
198 libusb_error_name(device_count));
199 return SR_ERR;
200 }
201
202 for (i = 0; i < device_count; i++) {
203 if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
204 sr_err("Failed to get device descriptor: %s.",
205 libusb_error_name(ret));
206 continue;
207 }
208
209 if (des.idVendor != devc->profile->vid
210 || des.idProduct != devc->profile->pid)
211 continue;
212
213 if (sdi->status == SR_ST_INITIALIZING) {
214 if (skip != sdi->index) {
215 /* Skip devices of this type that aren't the one we want. */
216 skip += 1;
217 continue;
218 }
219 } else if (sdi->status == SR_ST_INACTIVE) {
220 /*
221 * This device is fully enumerated, so we need to find
222 * this device by vendor, product, bus and address.
223 */
224 if (libusb_get_bus_number(devlist[i]) != devc->usb->bus
225 || libusb_get_device_address(devlist[i]) != devc->usb->address)
226 /* This is not the one. */
227 continue;
228 }
229
230 if (!(ret = libusb_open(devlist[i], &devc->usb->devhdl))) {
231 if (devc->usb->address == 0xff)
232 /*
233 * First time we touch this device after FW
234 * upload, so we don't know the address yet.
235 */
236 devc->usb->address = libusb_get_device_address(devlist[i]);
237 } else {
238 sr_err("Failed to open device: %s.",
239 libusb_error_name(ret));
240 break;
241 }
242
243 ret = command_get_fw_version(devc->usb->devhdl, &vi);
244 if (ret != SR_OK) {
245 sr_err("Failed to get firmware version.");
246 break;
247 }
248
249 ret = command_get_revid_version(devc->usb->devhdl, &revid);
250 if (ret != SR_OK) {
251 sr_err("Failed to get REVID.");
252 break;
253 }
254
255 /*
256 * Changes in major version mean incompatible/API changes, so
257 * bail out if we encounter an incompatible version.
258 * Different minor versions are OK, they should be compatible.
259 */
260 if (vi.major != FX2LAFW_REQUIRED_VERSION_MAJOR) {
261 sr_err("Expected firmware version %d.x, "
262 "got %d.%d.", FX2LAFW_REQUIRED_VERSION_MAJOR,
263 vi.major, vi.minor);
264 break;
265 }
266
267 sdi->status = SR_ST_ACTIVE;
268 sr_info("Opened device %d on %d.%d, "
269 "interface %d, firmware %d.%d.",
270 sdi->index, devc->usb->bus, devc->usb->address,
271 USB_INTERFACE, vi.major, vi.minor);
272
273 sr_info("Detected REVID=%d, it's a Cypress CY7C68013%s.",
274 revid, (revid != 1) ? " (FX2)" : "A (FX2LP)");
275
276 break;
277 }
278 libusb_free_device_list(devlist, 1);
279
280 if (sdi->status != SR_ST_ACTIVE)
281 return SR_ERR;
282
283 return SR_OK;
284}
285
286static int configure_probes(const struct sr_dev_inst *sdi)
287{
288 struct dev_context *devc;
289 struct sr_probe *probe;
290 GSList *l;
291 int probe_bit, stage, i;
292 char *tc;
293
294 devc = sdi->priv;
295 for (i = 0; i < NUM_TRIGGER_STAGES; i++) {
296 devc->trigger_mask[i] = 0;
297 devc->trigger_value[i] = 0;
298 }
299
300 stage = -1;
301 for (l = sdi->probes; l; l = l->next) {
302 probe = (struct sr_probe *)l->data;
303 if (probe->enabled == FALSE)
304 continue;
305
306 if (probe->index > 7)
307 devc->sample_wide = TRUE;
308
309 probe_bit = 1 << (probe->index);
310 if (!(probe->trigger))
311 continue;
312
313 stage = 0;
314 for (tc = probe->trigger; *tc; tc++) {
315 devc->trigger_mask[stage] |= probe_bit;
316 if (*tc == '1')
317 devc->trigger_value[stage] |= probe_bit;
318 stage++;
319 if (stage > NUM_TRIGGER_STAGES)
320 return SR_ERR;
321 }
322 }
323
324 if (stage == -1)
325 /*
326 * We didn't configure any triggers, make sure acquisition
327 * doesn't wait for any.
328 */
329 devc->trigger_stage = TRIGGER_FIRED;
330 else
331 devc->trigger_stage = 0;
332
333 return SR_OK;
334}
335
336static struct dev_context *fx2lafw_dev_new(void)
337{
338 struct dev_context *devc;
339
340 if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
341 sr_err("Device context malloc failed.");
342 return NULL;
343 }
344
345 devc->trigger_stage = TRIGGER_FIRED;
346
347 return devc;
348}
349
350static int clear_instances(void)
351{
352 GSList *l;
353 struct sr_dev_inst *sdi;
354 struct drv_context *drvc;
355 struct dev_context *devc;
356 int ret;
357
358 drvc = di->priv;
359 ret = SR_OK;
360 for (l = drvc->instances; l; l = l->next) {
361 if (!(sdi = l->data)) {
362 /* Log error, but continue cleaning up the rest. */
363 sr_err("sdi was NULL, continuing.");
364 ret = SR_ERR_BUG;
365 continue;
366 }
367 if (!(devc = sdi->priv)) {
368 /* Log error, but continue cleaning up the rest. */
369 sr_err("sdi->priv was NULL, continuing.");
370 ret = SR_ERR_BUG;
371 continue;
372 }
373 hw_dev_close(sdi);
374 sr_usb_dev_inst_free(devc->usb);
375 sdi = l->data;
376 sr_dev_inst_free(sdi);
377 }
378
379 g_slist_free(drvc->instances);
380 drvc->instances = NULL;
381
382 return ret;
383}
384
385static int hw_init(struct sr_context *sr_ctx)
386{
387 struct drv_context *drvc;
388
389 if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
390 sr_err("Driver context malloc failed.");
391 return SR_ERR_MALLOC;
392 }
393
394 drvc->sr_ctx = sr_ctx;
395 di->priv = drvc;
396
397 return SR_OK;
398}
399
400static GSList *hw_scan(GSList *options)
401{
402 GSList *devices;
403 struct libusb_device_descriptor des;
404 struct sr_dev_inst *sdi;
405 const struct fx2lafw_profile *prof;
406 struct drv_context *drvc;
407 struct dev_context *devc;
408 struct sr_probe *probe;
409 libusb_device **devlist;
410 int devcnt, num_logic_probes, ret, i, j;
411
412 (void)options;
413
414 drvc = di->priv;
415
416 /* This scan always invalidates any previous scans. */
417 clear_instances();
418
419 /* Find all fx2lafw compatible devices and upload firmware to them. */
420 devices = NULL;
421 libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
422 for (i = 0; devlist[i]; i++) {
423
424 if ((ret = libusb_get_device_descriptor(
425 devlist[i], &des)) != 0) {
426 sr_warn("Failed to get device descriptor: %s.",
427 libusb_error_name(ret));
428 continue;
429 }
430
431 prof = NULL;
432 for (j = 0; supported_fx2[j].vid; j++) {
433 if (des.idVendor == supported_fx2[j].vid &&
434 des.idProduct == supported_fx2[j].pid) {
435 prof = &supported_fx2[j];
436 }
437 }
438
439 /* Skip if the device was not found. */
440 if (!prof)
441 continue;
442
443 devcnt = g_slist_length(drvc->instances);
444 sdi = sr_dev_inst_new(devcnt, SR_ST_INITIALIZING,
445 prof->vendor, prof->model, prof->model_version);
446 if (!sdi)
447 return NULL;
448 sdi->driver = di;
449
450 /* Fill in probelist according to this device's profile. */
451 num_logic_probes = prof->dev_caps & DEV_CAPS_16BIT ? 16 : 8;
452 for (j = 0; j < num_logic_probes; j++) {
453 if (!(probe = sr_probe_new(j, SR_PROBE_LOGIC, TRUE,
454 probe_names[j])))
455 return NULL;
456 sdi->probes = g_slist_append(sdi->probes, probe);
457 }
458
459 devc = fx2lafw_dev_new();
460 devc->profile = prof;
461 sdi->priv = devc;
462 drvc->instances = g_slist_append(drvc->instances, sdi);
463 devices = g_slist_append(devices, sdi);
464
465 if (check_conf_profile(devlist[i])) {
466 /* Already has the firmware, so fix the new address. */
467 sr_dbg("Found an fx2lafw device.");
468 sdi->status = SR_ST_INACTIVE;
469 devc->usb = sr_usb_dev_inst_new
470 (libusb_get_bus_number(devlist[i]),
471 libusb_get_device_address(devlist[i]), NULL);
472 } else {
473 if (ezusb_upload_firmware(devlist[i], USB_CONFIGURATION,
474 prof->firmware) == SR_OK)
475 /* Store when this device's FW was updated. */
476 devc->fw_updated = g_get_monotonic_time();
477 else
478 sr_err("Firmware upload failed for "
479 "device %d.", devcnt);
480 devc->usb = sr_usb_dev_inst_new
481 (libusb_get_bus_number(devlist[i]), 0xff, NULL);
482 }
483 }
484 libusb_free_device_list(devlist, 1);
485
486 return devices;
487}
488
489static GSList *hw_dev_list(void)
490{
491 struct drv_context *drvc;
492
493 drvc = di->priv;
494
495 return drvc->instances;
496}
497
498static int hw_dev_open(struct sr_dev_inst *sdi)
499{
500 struct dev_context *devc;
501 int ret;
502 int64_t timediff_us, timediff_ms;
503
504 devc = sdi->priv;
505
506 /*
507 * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
508 * milliseconds for the FX2 to renumerate.
509 */
510 ret = SR_ERR;
511 if (devc->fw_updated > 0) {
512 sr_info("Waiting for device to reset.");
513 /* Takes >= 300ms for the FX2 to be gone from the USB bus. */
514 g_usleep(300 * 1000);
515 timediff_ms = 0;
516 while (timediff_ms < MAX_RENUM_DELAY_MS) {
517 if ((ret = fx2lafw_dev_open(sdi)) == SR_OK)
518 break;
519 g_usleep(100 * 1000);
520
521 timediff_us = g_get_monotonic_time() - devc->fw_updated;
522 timediff_ms = timediff_us / 1000;
523 sr_spew("Waited %" PRIi64 "ms.", timediff_ms);
524 }
525 if (ret != SR_OK) {
526 sr_err("Device failed to renumerate.");
527 return SR_ERR;
528 }
529 sr_info("Device came back after %" PRIi64 "ms.", timediff_ms);
530 } else {
531 sr_info("Firmware upload was not needed.");
532 ret = fx2lafw_dev_open(sdi);
533 }
534
535 if (ret != SR_OK) {
536 sr_err("Unable to open device.");
537 return SR_ERR;
538 }
539
540 devc = sdi->priv;
541
542 ret = libusb_claim_interface(devc->usb->devhdl, USB_INTERFACE);
543 if (ret != 0) {
544 switch(ret) {
545 case LIBUSB_ERROR_BUSY:
546 sr_err("Unable to claim USB interface. Another "
547 "program or driver has already claimed it.");
548 break;
549 case LIBUSB_ERROR_NO_DEVICE:
550 sr_err("Device has been disconnected.");
551 break;
552 default:
553 sr_err("Unable to claim interface: %s.",
554 libusb_error_name(ret));
555 break;
556 }
557
558 return SR_ERR;
559 }
560
561 if (devc->cur_samplerate == 0) {
562 /* Samplerate hasn't been set; default to the slowest one. */
563 if (config_set(SR_CONF_SAMPLERATE, &supported_samplerates[0],
564 sdi) == SR_ERR)
565 return SR_ERR;
566 }
567
568 return SR_OK;
569}
570
571static int hw_dev_close(struct sr_dev_inst *sdi)
572{
573 struct dev_context *devc;
574
575 devc = sdi->priv;
576 if (devc->usb->devhdl == NULL)
577 return SR_ERR;
578
579 sr_info("Closing device %d on %d.%d, interface %d.",
580 sdi->index, devc->usb->bus, devc->usb->address, USB_INTERFACE);
581 libusb_release_interface(devc->usb->devhdl, USB_INTERFACE);
582 libusb_close(devc->usb->devhdl);
583 devc->usb->devhdl = NULL;
584 sdi->status = SR_ST_INACTIVE;
585
586 return SR_OK;
587}
588
589static int hw_cleanup(void)
590{
591 struct drv_context *drvc;
592 int ret;
593
594 if (!(drvc = di->priv))
595 return SR_OK;
596
597 ret = clear_instances();
598
599 g_free(drvc);
600 di->priv = NULL;
601
602 return ret;
603}
604
605static int config_get(int id, const void **data, const struct sr_dev_inst *sdi)
606{
607 struct dev_context *devc;
608
609 switch (id) {
610 case SR_DI_HWCAPS:
611 *data = hwcaps;
612 break;
613 case SR_DI_SAMPLERATES:
614 *data = &samplerates;
615 break;
616 case SR_DI_TRIGGER_TYPES:
617 *data = TRIGGER_TYPES;
618 break;
619 case SR_DI_CUR_SAMPLERATE:
620 if (sdi) {
621 devc = sdi->priv;
622 *data = &devc->cur_samplerate;
623 } else
624 return SR_ERR;
625 break;
626 default:
627 return SR_ERR_ARG;
628 }
629
630 return SR_OK;
631}
632
633static int config_set(int id, const void *value, const struct sr_dev_inst *sdi)
634{
635 struct dev_context *devc;
636 int ret;
637
638 devc = sdi->priv;
639
640 if (id == SR_CONF_SAMPLERATE) {
641 devc->cur_samplerate = *(const uint64_t *)value;
642 ret = SR_OK;
643 } else if (id == SR_CONF_LIMIT_SAMPLES) {
644 devc->limit_samples = *(const uint64_t *)value;
645 ret = SR_OK;
646 } else {
647 ret = SR_ERR;
648 }
649
650 return ret;
651}
652
653static int receive_data(int fd, int revents, void *cb_data)
654{
655 struct timeval tv;
656 struct drv_context *drvc;
657
658 (void)fd;
659 (void)revents;
660 (void)cb_data;
661
662 drvc = di->priv;
663
664 tv.tv_sec = tv.tv_usec = 0;
665 libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
666
667 return TRUE;
668}
669
670static void abort_acquisition(struct dev_context *devc)
671{
672 int i;
673
674 devc->num_samples = -1;
675
676 for (i = devc->num_transfers - 1; i >= 0; i--) {
677 if (devc->transfers[i])
678 libusb_cancel_transfer(devc->transfers[i]);
679 }
680}
681
682static void finish_acquisition(struct dev_context *devc)
683{
684 struct sr_datafeed_packet packet;
685 struct drv_context *drvc = di->priv;
686 const struct libusb_pollfd **lupfd;
687 int i;
688
689 /* Terminate session. */
690 packet.type = SR_DF_END;
691 sr_session_send(devc->session_dev_id, &packet);
692
693 /* Remove fds from polling. */
694 lupfd = libusb_get_pollfds(drvc->sr_ctx->libusb_ctx);
695 for (i = 0; lupfd[i]; i++)
696 sr_source_remove(lupfd[i]->fd);
697 free(lupfd); /* NOT g_free()! */
698
699 devc->num_transfers = 0;
700 g_free(devc->transfers);
701}
702
703static void free_transfer(struct libusb_transfer *transfer)
704{
705 struct dev_context *devc;
706 unsigned int i;
707
708 devc = transfer->user_data;
709
710 g_free(transfer->buffer);
711 transfer->buffer = NULL;
712 libusb_free_transfer(transfer);
713
714 for (i = 0; i < devc->num_transfers; i++) {
715 if (devc->transfers[i] == transfer) {
716 devc->transfers[i] = NULL;
717 break;
718 }
719 }
720
721 devc->submitted_transfers--;
722 if (devc->submitted_transfers == 0)
723 finish_acquisition(devc);
724}
725
726static void resubmit_transfer(struct libusb_transfer *transfer)
727{
728 int ret;
729
730 if ((ret = libusb_submit_transfer(transfer)) == LIBUSB_SUCCESS)
731 return;
732
733 free_transfer(transfer);
734 /* TODO: Stop session? */
735
736 sr_err("%s: %s", __func__, libusb_error_name(ret));
737}
738
739static void receive_transfer(struct libusb_transfer *transfer)
740{
741 gboolean packet_has_error = FALSE;
742 struct sr_datafeed_packet packet;
743 struct sr_datafeed_logic logic;
744 struct dev_context *devc;
745 int trigger_offset, i, sample_width, cur_sample_count;
746 int trigger_offset_bytes;
747 uint8_t *cur_buf;
748
749 devc = transfer->user_data;
750
751 /*
752 * If acquisition has already ended, just free any queued up
753 * transfer that come in.
754 */
755 if (devc->num_samples == -1) {
756 free_transfer(transfer);
757 return;
758 }
759
760 sr_info("receive_transfer(): status %d received %d bytes.",
761 transfer->status, transfer->actual_length);
762
763 /* Save incoming transfer before reusing the transfer struct. */
764 cur_buf = transfer->buffer;
765 sample_width = devc->sample_wide ? 2 : 1;
766 cur_sample_count = transfer->actual_length / sample_width;
767
768 switch (transfer->status) {
769 case LIBUSB_TRANSFER_NO_DEVICE:
770 abort_acquisition(devc);
771 free_transfer(transfer);
772 return;
773 case LIBUSB_TRANSFER_COMPLETED:
774 case LIBUSB_TRANSFER_TIMED_OUT: /* We may have received some data though. */
775 break;
776 default:
777 packet_has_error = TRUE;
778 break;
779 }
780
781 if (transfer->actual_length == 0 || packet_has_error) {
782 devc->empty_transfer_count++;
783 if (devc->empty_transfer_count > MAX_EMPTY_TRANSFERS) {
784 /*
785 * The FX2 gave up. End the acquisition, the frontend
786 * will work out that the samplecount is short.
787 */
788 abort_acquisition(devc);
789 free_transfer(transfer);
790 } else {
791 resubmit_transfer(transfer);
792 }
793 return;
794 } else {
795 devc->empty_transfer_count = 0;
796 }
797
798 trigger_offset = 0;
799 if (devc->trigger_stage >= 0) {
800 for (i = 0; i < cur_sample_count; i++) {
801
802 const uint16_t cur_sample = devc->sample_wide ?
803 *((const uint16_t*)cur_buf + i) :
804 *((const uint8_t*)cur_buf + i);
805
806 if ((cur_sample & devc->trigger_mask[devc->trigger_stage]) ==
807 devc->trigger_value[devc->trigger_stage]) {
808 /* Match on this trigger stage. */
809 devc->trigger_buffer[devc->trigger_stage] = cur_sample;
810 devc->trigger_stage++;
811
812 if (devc->trigger_stage == NUM_TRIGGER_STAGES ||
813 devc->trigger_mask[devc->trigger_stage] == 0) {
814 /* Match on all trigger stages, we're done. */
815 trigger_offset = i + 1;
816
817 /*
818 * TODO: Send pre-trigger buffer to session bus.
819 * Tell the frontend we hit the trigger here.
820 */
821 packet.type = SR_DF_TRIGGER;
822 packet.payload = NULL;
823 sr_session_send(devc->session_dev_id, &packet);
824
825 /*
826 * Send the samples that triggered it,
827 * since we're skipping past them.
828 */
829 packet.type = SR_DF_LOGIC;
830 packet.payload = &logic;
831 logic.unitsize = sizeof(*devc->trigger_buffer);
832 logic.length = devc->trigger_stage * logic.unitsize;
833 logic.data = devc->trigger_buffer;
834 sr_session_send(devc->session_dev_id, &packet);
835
836 devc->trigger_stage = TRIGGER_FIRED;
837 break;
838 }
839 } else if (devc->trigger_stage > 0) {
840 /*
841 * We had a match before, but not in the next sample. However, we may
842 * have a match on this stage in the next bit -- trigger on 0001 will
843 * fail on seeing 00001, so we need to go back to stage 0 -- but at
844 * the next sample from the one that matched originally, which the
845 * counter increment at the end of the loop takes care of.
846 */
847 i -= devc->trigger_stage;
848 if (i < -1)
849 i = -1; /* Oops, went back past this buffer. */
850 /* Reset trigger stage. */
851 devc->trigger_stage = 0;
852 }
853 }
854 }
855
856 if (devc->trigger_stage == TRIGGER_FIRED) {
857 /* Send the incoming transfer to the session bus. */
858 trigger_offset_bytes = trigger_offset * sample_width;
859 packet.type = SR_DF_LOGIC;
860 packet.payload = &logic;
861 logic.length = transfer->actual_length - trigger_offset_bytes;
862 logic.unitsize = sample_width;
863 logic.data = cur_buf + trigger_offset_bytes;
864 sr_session_send(devc->session_dev_id, &packet);
865
866 devc->num_samples += cur_sample_count;
867 if (devc->limit_samples &&
868 (unsigned int)devc->num_samples > devc->limit_samples) {
869 abort_acquisition(devc);
870 free_transfer(transfer);
871 return;
872 }
873 } else {
874 /*
875 * TODO: Buffer pre-trigger data in capture
876 * ratio-sized buffer.
877 */
878 }
879
880 resubmit_transfer(transfer);
881}
882
883static unsigned int to_bytes_per_ms(unsigned int samplerate)
884{
885 return samplerate / 1000;
886}
887
888static size_t get_buffer_size(struct dev_context *devc)
889{
890 size_t s;
891
892 /*
893 * The buffer should be large enough to hold 10ms of data and
894 * a multiple of 512.
895 */
896 s = 10 * to_bytes_per_ms(devc->cur_samplerate);
897 return (s + 511) & ~511;
898}
899
900static unsigned int get_number_of_transfers(struct dev_context *devc)
901{
902 unsigned int n;
903
904 /* Total buffer size should be able to hold about 500ms of data. */
905 n = 500 * to_bytes_per_ms(devc->cur_samplerate) / get_buffer_size(devc);
906
907 if (n > NUM_SIMUL_TRANSFERS)
908 return NUM_SIMUL_TRANSFERS;
909
910 return n;
911}
912
913static unsigned int get_timeout(struct dev_context *devc)
914{
915 size_t total_size;
916 unsigned int timeout;
917
918 total_size = get_buffer_size(devc) * get_number_of_transfers(devc);
919 timeout = total_size / to_bytes_per_ms(devc->cur_samplerate);
920 return timeout + timeout / 4; /* Leave a headroom of 25% percent. */
921}
922
923static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
924 void *cb_data)
925{
926 struct sr_datafeed_packet packet;
927 struct sr_datafeed_header header;
928 struct dev_context *devc;
929 struct drv_context *drvc;
930 struct libusb_transfer *transfer;
931 const struct libusb_pollfd **lupfd;
932 unsigned int i, timeout, num_transfers;
933 int ret;
934 unsigned char *buf;
935 size_t size;
936
937 drvc = di->priv;
938 devc = sdi->priv;
939
940 if (devc->submitted_transfers != 0)
941 return SR_ERR;
942
943 if (configure_probes(sdi) != SR_OK) {
944 sr_err("Failed to configure probes.");
945 return SR_ERR;
946 }
947
948 devc->session_dev_id = cb_data;
949 devc->num_samples = 0;
950 devc->empty_transfer_count = 0;
951
952 timeout = get_timeout(devc);
953 num_transfers = get_number_of_transfers(devc);
954 size = get_buffer_size(devc);
955
956 devc->transfers = g_try_malloc0(sizeof(*devc->transfers) * num_transfers);
957 if (!devc->transfers) {
958 sr_err("USB transfers malloc failed.");
959 return SR_ERR_MALLOC;
960 }
961
962 devc->num_transfers = num_transfers;
963
964 for (i = 0; i < num_transfers; i++) {
965 if (!(buf = g_try_malloc(size))) {
966 sr_err("USB transfer buffer malloc failed.");
967 return SR_ERR_MALLOC;
968 }
969 transfer = libusb_alloc_transfer(0);
970 libusb_fill_bulk_transfer(transfer, devc->usb->devhdl,
971 2 | LIBUSB_ENDPOINT_IN, buf, size,
972 receive_transfer, devc, timeout);
973 if ((ret = libusb_submit_transfer(transfer)) != 0) {
974 sr_err("Failed to submit transfer: %s.",
975 libusb_error_name(ret));
976 libusb_free_transfer(transfer);
977 g_free(buf);
978 abort_acquisition(devc);
979 return SR_ERR;
980 }
981 devc->transfers[i] = transfer;
982 devc->submitted_transfers++;
983 }
984
985 lupfd = libusb_get_pollfds(drvc->sr_ctx->libusb_ctx);
986 for (i = 0; lupfd[i]; i++)
987 sr_source_add(lupfd[i]->fd, lupfd[i]->events,
988 timeout, receive_data, NULL);
989 free(lupfd); /* NOT g_free()! */
990
991 packet.type = SR_DF_HEADER;
992 packet.payload = &header;
993 header.feed_version = 1;
994 gettimeofday(&header.starttime, NULL);
995 sr_session_send(cb_data, &packet);
996
997 if ((ret = command_start_acquisition(devc->usb->devhdl,
998 devc->cur_samplerate, devc->sample_wide)) != SR_OK) {
999 abort_acquisition(devc);
1000 return ret;
1001 }
1002
1003 return SR_OK;
1004}
1005
1006/* TODO: This stops acquisition on ALL devices, ignoring dev_index. */
1007static int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
1008{
1009 (void)cb_data;
1010
1011 abort_acquisition(sdi->priv);
1012
1013 return SR_OK;
1014}
1015
1016SR_PRIV struct sr_dev_driver fx2lafw_driver_info = {
1017 .name = "fx2lafw",
1018 .longname = "fx2lafw (generic driver for FX2 based LAs)",
1019 .api_version = 1,
1020 .init = hw_init,
1021 .cleanup = hw_cleanup,
1022 .scan = hw_scan,
1023 .dev_list = hw_dev_list,
1024 .dev_clear = clear_instances,
1025 .config_get = config_get,
1026 .config_set = config_set,
1027 .dev_open = hw_dev_open,
1028 .dev_close = hw_dev_close,
1029 .dev_acquisition_start = hw_dev_acquisition_start,
1030 .dev_acquisition_stop = hw_dev_acquisition_stop,
1031 .priv = NULL,
1032};
Hardware access and backend lib