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hardware: Call libusb_error_name() in all USB-related error messages
[libsigrok.git] / hardware / fx2lafw / fx2lafw.c
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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_HWCAP_LOGIC_ANALYZER,
86 SR_HWCAP_SAMPLERATE,
87
88 /* These are really implemented in the driver, not the hardware. */
89 SR_HWCAP_LIMIT_SAMPLES,
90 SR_HWCAP_CONTINUOUS,
91 0,
92};
93
94static const char *probe_names[] = {
95 "0",
96 "1",
97 "2",
98 "3",
99 "4",
100 "5",
101 "6",
102 "7",
103 "8",
104 "9",
105 "10",
106 "11",
107 "12",
108 "13",
109 "14",
110 "15",
111 NULL,
112};
113
114static const uint64_t supported_samplerates[] = {
115 SR_KHZ(20),
116 SR_KHZ(25),
117 SR_KHZ(50),
118 SR_KHZ(100),
119 SR_KHZ(200),
120 SR_KHZ(250),
121 SR_KHZ(500),
122 SR_MHZ(1),
123 SR_MHZ(2),
124 SR_MHZ(3),
125 SR_MHZ(4),
126 SR_MHZ(6),
127 SR_MHZ(8),
128 SR_MHZ(12),
129 SR_MHZ(16),
130 SR_MHZ(24),
131 0,
132};
133
134static const struct sr_samplerates samplerates = {
135 0,
136 0,
137 0,
138 supported_samplerates,
139};
140
141SR_PRIV struct sr_dev_driver fx2lafw_driver_info;
142static struct sr_dev_driver *fdi = &fx2lafw_driver_info;
143static int hw_dev_close(struct sr_dev_inst *sdi);
144static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
145 const void *value);
146static int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data);
147
148/**
149 * Check the USB configuration to determine if this is an fx2lafw device.
150 *
151 * @return TRUE if the device's configuration profile match fx2lafw
152 * configuration, FALSE otherwise.
153 */
154static gboolean check_conf_profile(libusb_device *dev)
155{
156 struct libusb_device_descriptor des;
157 struct libusb_device_handle *hdl;
158 gboolean ret;
159 unsigned char strdesc[64];
160
161 hdl = NULL;
162 ret = FALSE;
163 while (!ret) {
164 /* Assume the FW has not been loaded, unless proven wrong. */
165 if (libusb_get_device_descriptor(dev, &des) != 0)
166 break;
167
168 if (libusb_open(dev, &hdl) != 0)
169 break;
170
171 if (libusb_get_string_descriptor_ascii(hdl,
172 des.iManufacturer, strdesc, sizeof(strdesc)) < 0)
173 break;
174 if (strncmp((const char *)strdesc, "sigrok", 6))
175 break;
176
177 if (libusb_get_string_descriptor_ascii(hdl,
178 des.iProduct, strdesc, sizeof(strdesc)) < 0)
179 break;
180 if (strncmp((const char *)strdesc, "fx2lafw", 7))
181 break;
182
183 /* If we made it here, it must be an fx2lafw. */
184 ret = TRUE;
185 }
186 if (hdl)
187 libusb_close(hdl);
188
189 return ret;
190}
191
192static int fx2lafw_dev_open(struct sr_dev_inst *sdi)
193{
194 libusb_device **devlist;
195 struct libusb_device_descriptor des;
196 struct dev_context *devc;
197 struct drv_context *drvc = fdi->priv;
198 struct version_info vi;
199 int ret, skip, i;
200 uint8_t revid;
201
202 devc = sdi->priv;
203
204 if (sdi->status == SR_ST_ACTIVE)
205 /* already in use */
206 return SR_ERR;
207
208 skip = 0;
209 const int device_count = libusb_get_device_list(
210 drvc->sr_ctx->libusb_ctx, &devlist);
211 if (device_count < 0) {
212 sr_err("fx2lafw: Failed to retrieve device list (%d)",
213 device_count);
214 return SR_ERR;
215 }
216
217 for (i = 0; i < device_count; i++) {
218 if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
219 sr_err("fx2lafw: Failed to get device descriptor: %s.",
220 libusb_error_name(ret));
221 continue;
222 }
223
224 if (des.idVendor != devc->profile->vid
225 || des.idProduct != devc->profile->pid)
226 continue;
227
228 if (sdi->status == SR_ST_INITIALIZING) {
229 if (skip != sdi->index) {
230 /* Skip devices of this type that aren't the one we want. */
231 skip += 1;
232 continue;
233 }
234 } else if (sdi->status == SR_ST_INACTIVE) {
235 /*
236 * This device is fully enumerated, so we need to find
237 * this device by vendor, product, bus and address.
238 */
239 if (libusb_get_bus_number(devlist[i]) != devc->usb->bus
240 || libusb_get_device_address(devlist[i]) != devc->usb->address)
241 /* this is not the one */
242 continue;
243 }
244
245 if (!(ret = libusb_open(devlist[i], &devc->usb->devhdl))) {
246 if (devc->usb->address == 0xff)
247 /*
248 * first time we touch this device after firmware upload,
249 * so we don't know the address yet.
250 */
251 devc->usb->address = libusb_get_device_address(devlist[i]);
252 } else {
253 sr_err("fx2lafw: Failed to open device: %s.",
254 libusb_error_name(ret));
255 break;
256 }
257
258 ret = command_get_fw_version(devc->usb->devhdl, &vi);
259 if (ret != SR_OK) {
260 sr_err("fx2lafw: Failed to retrieve "
261 "firmware version information.");
262 break;
263 }
264
265 ret = command_get_revid_version(devc->usb->devhdl, &revid);
266 if (ret != SR_OK) {
267 sr_err("fx2lafw: Failed to retrieve REVID.");
268 break;
269 }
270
271 /*
272 * Changes in major version mean incompatible/API changes, so
273 * bail out if we encounter an incompatible version.
274 * Different minor versions are OK, they should be compatible.
275 */
276 if (vi.major != FX2LAFW_REQUIRED_VERSION_MAJOR) {
277 sr_err("fx2lafw: Expected firmware version %d.x, "
278 "got %d.%d.", FX2LAFW_REQUIRED_VERSION_MAJOR,
279 vi.major, vi.minor);
280 break;
281 }
282
283 sdi->status = SR_ST_ACTIVE;
284 sr_info("fx2lafw: Opened device %d on %d.%d "
285 "interface %d, firmware %d.%d, REVID %d.",
286 sdi->index, devc->usb->bus, devc->usb->address,
287 USB_INTERFACE, vi.major, vi.minor, revid);
288
289 break;
290 }
291 libusb_free_device_list(devlist, 1);
292
293 if (sdi->status != SR_ST_ACTIVE)
294 return SR_ERR;
295
296 return SR_OK;
297}
298
299static int configure_probes(const struct sr_dev_inst *sdi)
300{
301 struct dev_context *devc;
302 struct sr_probe *probe;
303 GSList *l;
304 int probe_bit, stage, i;
305 char *tc;
306
307 devc = sdi->priv;
308 for (i = 0; i < NUM_TRIGGER_STAGES; i++) {
309 devc->trigger_mask[i] = 0;
310 devc->trigger_value[i] = 0;
311 }
312
313 stage = -1;
314 for (l = sdi->probes; l; l = l->next) {
315 probe = (struct sr_probe *)l->data;
316 if (probe->enabled == FALSE)
317 continue;
318
319 if (probe->index > 7)
320 devc->sample_wide = TRUE;
321
322 probe_bit = 1 << (probe->index);
323 if (!(probe->trigger))
324 continue;
325
326 stage = 0;
327 for (tc = probe->trigger; *tc; tc++) {
328 devc->trigger_mask[stage] |= probe_bit;
329 if (*tc == '1')
330 devc->trigger_value[stage] |= probe_bit;
331 stage++;
332 if (stage > NUM_TRIGGER_STAGES)
333 return SR_ERR;
334 }
335 }
336
337 if (stage == -1)
338 /*
339 * We didn't configure any triggers, make sure acquisition
340 * doesn't wait for any.
341 */
342 devc->trigger_stage = TRIGGER_FIRED;
343 else
344 devc->trigger_stage = 0;
345
346 return SR_OK;
347}
348
349static struct dev_context *fx2lafw_dev_new(void)
350{
351 struct dev_context *devc;
352
353 if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
354 sr_err("fx2lafw: %s: devc malloc failed.", __func__);
355 return NULL;
356 }
357
358 devc->trigger_stage = TRIGGER_FIRED;
359
360 return devc;
361}
362
363static int clear_instances(void)
364{
365 GSList *l;
366 struct sr_dev_inst *sdi;
367 struct drv_context *drvc;
368 struct dev_context *devc;
369 int ret;
370
371 drvc = fdi->priv;
372 ret = SR_OK;
373 for (l = drvc->instances; l; l = l->next) {
374 if (!(sdi = l->data)) {
375 /* Log error, but continue cleaning up the rest. */
376 sr_err("fx2lafw: %s: sdi was NULL, continuing.",
377 __func__);
378 ret = SR_ERR_BUG;
379 continue;
380 }
381 if (!(devc = sdi->priv)) {
382 /* Log error, but continue cleaning up the rest. */
383 sr_err("fx2lafw: %s: sdi->priv was NULL, continuing",
384 __func__);
385 ret = SR_ERR_BUG;
386 continue;
387 }
388 hw_dev_close(sdi);
389 sr_usb_dev_inst_free(devc->usb);
390 sdi = l->data;
391 sr_dev_inst_free(sdi);
392 }
393
394 g_slist_free(drvc->instances);
395 drvc->instances = NULL;
396
397 return ret;
398}
399
400
401/*
402 * API callbacks
403 */
404
405static int hw_init(struct sr_context *sr_ctx)
406{
407 struct drv_context *drvc;
408
409 if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
410 sr_err("fx2lafw: driver context malloc failed.");
411 return SR_ERR_MALLOC;
412 }
413
414 drvc->sr_ctx = sr_ctx;
415 fdi->priv = drvc;
416
417 return SR_OK;
418}
419
420static GSList *hw_scan(GSList *options)
421{
422 GSList *devices;
423 struct libusb_device_descriptor des;
424 struct sr_dev_inst *sdi;
425 const struct fx2lafw_profile *prof;
426 struct drv_context *drvc;
427 struct dev_context *devc;
428 struct sr_probe *probe;
429 libusb_device **devlist;
430 int devcnt, num_logic_probes, ret, i, j;
431
432 (void)options;
433
434 drvc = fdi->priv;
435
436 /* This scan always invalidates any previous scans. */
437 clear_instances();
438
439 /* Find all fx2lafw compatible devices and upload firmware to them. */
440 devices = NULL;
441 libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
442 for (i = 0; devlist[i]; i++) {
443
444 if ((ret = libusb_get_device_descriptor(
445 devlist[i], &des)) != 0) {
446 sr_warn("fx2lafw: Failed to get device descriptor: %s.",
447 libusb_error_name(ret));
448 continue;
449 }
450
451 prof = NULL;
452 for (j = 0; supported_fx2[j].vid; j++) {
453 if (des.idVendor == supported_fx2[j].vid &&
454 des.idProduct == supported_fx2[j].pid) {
455 prof = &supported_fx2[j];
456 }
457 }
458
459 /* Skip if the device was not found */
460 if (!prof)
461 continue;
462
463 devcnt = g_slist_length(drvc->instances);
464 sdi = sr_dev_inst_new(devcnt, SR_ST_INITIALIZING,
465 prof->vendor, prof->model, prof->model_version);
466 if (!sdi)
467 return NULL;
468 sdi->driver = fdi;
469
470 /* Fill in probelist according to this device's profile. */
471 num_logic_probes = prof->dev_caps & DEV_CAPS_16BIT ? 16 : 8;
472 for (j = 0; j < num_logic_probes; j++) {
473 if (!(probe = sr_probe_new(j, SR_PROBE_LOGIC, TRUE,
474 probe_names[j])))
475 return NULL;
476 sdi->probes = g_slist_append(sdi->probes, probe);
477 }
478
479 devc = fx2lafw_dev_new();
480 devc->profile = prof;
481 sdi->priv = devc;
482 drvc->instances = g_slist_append(drvc->instances, sdi);
483 devices = g_slist_append(devices, sdi);
484
485 if (check_conf_profile(devlist[i])) {
486 /* Already has the firmware, so fix the new address. */
487 sr_dbg("fx2lafw: Found an fx2lafw device.");
488 sdi->status = SR_ST_INACTIVE;
489 devc->usb = sr_usb_dev_inst_new
490 (libusb_get_bus_number(devlist[i]),
491 libusb_get_device_address(devlist[i]), NULL);
492 } else {
493 if (ezusb_upload_firmware(devlist[i], USB_CONFIGURATION,
494 prof->firmware) == SR_OK)
495 /* Remember when the firmware on this device was updated */
496 devc->fw_updated = g_get_monotonic_time();
497 else
498 sr_err("fx2lafw: Firmware upload failed for "
499 "device %d.", devcnt);
500 devc->usb = sr_usb_dev_inst_new
501 (libusb_get_bus_number(devlist[i]), 0xff, NULL);
502 }
503 }
504 libusb_free_device_list(devlist, 1);
505
506 return devices;
507}
508
509static GSList *hw_dev_list(void)
510{
511 struct drv_context *drvc;
512
513 drvc = fdi->priv;
514
515 return drvc->instances;
516}
517
518static int hw_dev_open(struct sr_dev_inst *sdi)
519{
520 struct dev_context *devc;
521 int ret;
522 int64_t timediff_us, timediff_ms;
523
524 devc = sdi->priv;
525
526 /*
527 * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
528 * milliseconds for the FX2 to renumerate.
529 */
530 ret = SR_ERR;
531 if (devc->fw_updated > 0) {
532 sr_info("fx2lafw: Waiting for device to reset.");
533 /* takes at least 300ms for the FX2 to be gone from the USB bus */
534 g_usleep(300 * 1000);
535 timediff_ms = 0;
536 while (timediff_ms < MAX_RENUM_DELAY_MS) {
537 if ((ret = fx2lafw_dev_open(sdi)) == SR_OK)
538 break;
539 g_usleep(100 * 1000);
540
541 timediff_us = g_get_monotonic_time() - devc->fw_updated;
542 timediff_ms = timediff_us / 1000;
543 sr_spew("fx2lafw: waited %" PRIi64 " ms", timediff_ms);
544 }
545 sr_info("fx2lafw: Device came back after %d ms.", timediff_ms);
546 } else {
547 ret = fx2lafw_dev_open(sdi);
548 }
549
550 if (ret != SR_OK) {
551 sr_err("fx2lafw: Unable to open device.");
552 return SR_ERR;
553 }
554 devc = sdi->priv;
555
556 ret = libusb_claim_interface(devc->usb->devhdl, USB_INTERFACE);
557 if (ret != 0) {
558 switch(ret) {
559 case LIBUSB_ERROR_BUSY:
560 sr_err("fx2lafw: Unable to claim USB interface. Another "
561 "program or driver has already claimed it.");
562 break;
563
564 case LIBUSB_ERROR_NO_DEVICE:
565 sr_err("fx2lafw: Device has been disconnected.");
566 break;
567
568 default:
569 sr_err("fx2lafw: Unable to claim interface: %s.",
570 libusb_error_name(ret));
571 break;
572 }
573
574 return SR_ERR;
575 }
576
577 if (devc->cur_samplerate == 0) {
578 /* Samplerate hasn't been set; default to the slowest one. */
579 if (hw_dev_config_set(sdi, SR_HWCAP_SAMPLERATE,
580 &supported_samplerates[0]) == SR_ERR)
581 return SR_ERR;
582 }
583
584 return SR_OK;
585}
586
587static int hw_dev_close(struct sr_dev_inst *sdi)
588{
589 struct dev_context *devc;
590
591 devc = sdi->priv;
592 if (devc->usb->devhdl == NULL)
593 return SR_ERR;
594
595 sr_info("fx2lafw: Closing device %d on %d.%d interface %d.",
596 sdi->index, devc->usb->bus, devc->usb->address, USB_INTERFACE);
597 libusb_release_interface(devc->usb->devhdl, USB_INTERFACE);
598 libusb_close(devc->usb->devhdl);
599 devc->usb->devhdl = NULL;
600 sdi->status = SR_ST_INACTIVE;
601
602 return SR_OK;
603}
604
605static int hw_cleanup(void)
606{
607 struct drv_context *drvc;
608 int ret;
609
610 if (!(drvc = fdi->priv))
611 return SR_OK;
612
613 ret = clear_instances();
614
615 g_free(drvc);
616 fdi->priv = NULL;
617
618 return ret;
619}
620
621static int hw_info_get(int info_id, const void **data,
622 const struct sr_dev_inst *sdi)
623{
624 struct dev_context *devc;
625
626 switch (info_id) {
627 case SR_DI_HWCAPS:
628 *data = hwcaps;
629 break;
630 case SR_DI_NUM_PROBES:
631 if (sdi) {
632 devc = sdi->priv;
633 *data = GINT_TO_POINTER(
634 (devc->profile->dev_caps & DEV_CAPS_16BIT) ?
635 16 : 8);
636 } else
637 return SR_ERR;
638 break;
639 case SR_DI_PROBE_NAMES:
640 *data = probe_names;
641 break;
642 case SR_DI_SAMPLERATES:
643 *data = &samplerates;
644 break;
645 case SR_DI_TRIGGER_TYPES:
646 *data = TRIGGER_TYPES;
647 break;
648 case SR_DI_CUR_SAMPLERATE:
649 if (sdi) {
650 devc = sdi->priv;
651 *data = &devc->cur_samplerate;
652 } else
653 return SR_ERR;
654 break;
655 default:
656 return SR_ERR_ARG;
657 }
658
659 return SR_OK;
660}
661
662static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
663 const void *value)
664{
665 struct dev_context *devc;
666 int ret;
667
668 devc = sdi->priv;
669
670 if (hwcap == SR_HWCAP_SAMPLERATE) {
671 devc->cur_samplerate = *(const uint64_t *)value;
672 ret = SR_OK;
673 } else if (hwcap == SR_HWCAP_LIMIT_SAMPLES) {
674 devc->limit_samples = *(const uint64_t *)value;
675 ret = SR_OK;
676 } else {
677 ret = SR_ERR;
678 }
679
680 return ret;
681}
682
683static int receive_data(int fd, int revents, void *cb_data)
684{
685 struct timeval tv;
686 struct drv_context *drvc = fdi->priv;
687
688 (void)fd;
689 (void)revents;
690 (void)cb_data;
691
692 tv.tv_sec = tv.tv_usec = 0;
693 libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
694
695 return TRUE;
696}
697
698static void abort_acquisition(struct dev_context *devc)
699{
700 int i;
701
702 devc->num_samples = -1;
703
704 for (i = devc->num_transfers - 1; i >= 0; i--) {
705 if (devc->transfers[i])
706 libusb_cancel_transfer(devc->transfers[i]);
707 }
708}
709
710static void finish_acquisition(struct dev_context *devc)
711{
712 struct sr_datafeed_packet packet;
713 struct drv_context *drvc = fdi->priv;
714 int i;
715
716
717 /* Terminate session */
718 packet.type = SR_DF_END;
719 sr_session_send(devc->session_dev_id, &packet);
720
721 /* Remove fds from polling */
722 const struct libusb_pollfd **const lupfd =
723 libusb_get_pollfds(drvc->sr_ctx->libusb_ctx);
724 for (i = 0; lupfd[i]; i++)
725 sr_source_remove(lupfd[i]->fd);
726 free(lupfd); /* NOT g_free()! */
727
728 devc->num_transfers = 0;
729 g_free(devc->transfers);
730}
731
732static void free_transfer(struct libusb_transfer *transfer)
733{
734 struct dev_context *devc = transfer->user_data;
735 unsigned int i;
736
737 g_free(transfer->buffer);
738 transfer->buffer = NULL;
739 libusb_free_transfer(transfer);
740
741 for (i = 0; i < devc->num_transfers; i++) {
742 if (devc->transfers[i] == transfer) {
743 devc->transfers[i] = NULL;
744 break;
745 }
746 }
747
748 devc->submitted_transfers--;
749 if (devc->submitted_transfers == 0)
750 finish_acquisition(devc);
751
752}
753
754static void resubmit_transfer(struct libusb_transfer *transfer)
755{
756 int ret = libusb_submit_transfer(transfer);
757
758 if (LIBUSB_SUCCESS == ret)
759 return;
760
761 free_transfer(transfer);
762 /* TODO: Stop session? */
763
764 sr_err("fx2lafw: %s: %s", __func__, libusb_error_name(ret));
765}
766
767static void receive_transfer(struct libusb_transfer *transfer)
768{
769 gboolean packet_has_error = FALSE;
770 struct sr_datafeed_packet packet;
771 struct sr_datafeed_logic logic;
772 struct dev_context *devc = transfer->user_data;
773 int trigger_offset, i;
774
775 /*
776 * If acquisition has already ended, just free any queued up
777 * transfer that come in.
778 */
779 if (devc->num_samples == -1) {
780 free_transfer(transfer);
781 return;
782 }
783
784 sr_info("fx2lafw: receive_transfer(): status %d received %d bytes.",
785 transfer->status, transfer->actual_length);
786
787 /* Save incoming transfer before reusing the transfer struct. */
788 uint8_t *const cur_buf = transfer->buffer;
789 const int sample_width = devc->sample_wide ? 2 : 1;
790 const int cur_sample_count = transfer->actual_length / sample_width;
791
792 switch (transfer->status) {
793 case LIBUSB_TRANSFER_NO_DEVICE:
794 abort_acquisition(devc);
795 free_transfer(transfer);
796 return;
797 case LIBUSB_TRANSFER_COMPLETED:
798 case LIBUSB_TRANSFER_TIMED_OUT: /* We may have received some data though */
799 break;
800 default:
801 packet_has_error = TRUE;
802 break;
803 }
804
805 if (transfer->actual_length == 0 || packet_has_error) {
806 devc->empty_transfer_count++;
807 if (devc->empty_transfer_count > MAX_EMPTY_TRANSFERS) {
808 /*
809 * The FX2 gave up. End the acquisition, the frontend
810 * will work out that the samplecount is short.
811 */
812 abort_acquisition(devc);
813 free_transfer(transfer);
814 } else {
815 resubmit_transfer(transfer);
816 }
817 return;
818 } else {
819 devc->empty_transfer_count = 0;
820 }
821
822 trigger_offset = 0;
823 if (devc->trigger_stage >= 0) {
824 for (i = 0; i < cur_sample_count; i++) {
825
826 const uint16_t cur_sample = devc->sample_wide ?
827 *((const uint16_t*)cur_buf + i) :
828 *((const uint8_t*)cur_buf + i);
829
830 if ((cur_sample & devc->trigger_mask[devc->trigger_stage]) ==
831 devc->trigger_value[devc->trigger_stage]) {
832 /* Match on this trigger stage. */
833 devc->trigger_buffer[devc->trigger_stage] = cur_sample;
834 devc->trigger_stage++;
835
836 if (devc->trigger_stage == NUM_TRIGGER_STAGES ||
837 devc->trigger_mask[devc->trigger_stage] == 0) {
838 /* Match on all trigger stages, we're done. */
839 trigger_offset = i + 1;
840
841 /*
842 * TODO: Send pre-trigger buffer to session bus.
843 * Tell the frontend we hit the trigger here.
844 */
845 packet.type = SR_DF_TRIGGER;
846 packet.payload = NULL;
847 sr_session_send(devc->session_dev_id, &packet);
848
849 /*
850 * Send the samples that triggered it, since we're
851 * skipping past them.
852 */
853 packet.type = SR_DF_LOGIC;
854 packet.payload = &logic;
855 logic.unitsize = sizeof(*devc->trigger_buffer);
856 logic.length = devc->trigger_stage * logic.unitsize;
857 logic.data = devc->trigger_buffer;
858 sr_session_send(devc->session_dev_id, &packet);
859
860 devc->trigger_stage = TRIGGER_FIRED;
861 break;
862 }
863 } else if (devc->trigger_stage > 0) {
864 /*
865 * We had a match before, but not in the next sample. However, we may
866 * have a match on this stage in the next bit -- trigger on 0001 will
867 * fail on seeing 00001, so we need to go back to stage 0 -- but at
868 * the next sample from the one that matched originally, which the
869 * counter increment at the end of the loop takes care of.
870 */
871 i -= devc->trigger_stage;
872 if (i < -1)
873 i = -1; /* Oops, went back past this buffer. */
874 /* Reset trigger stage. */
875 devc->trigger_stage = 0;
876 }
877 }
878 }
879
880 if (devc->trigger_stage == TRIGGER_FIRED) {
881 /* Send the incoming transfer to the session bus. */
882 const int trigger_offset_bytes = trigger_offset * sample_width;
883 packet.type = SR_DF_LOGIC;
884 packet.payload = &logic;
885 logic.length = transfer->actual_length - trigger_offset_bytes;
886 logic.unitsize = sample_width;
887 logic.data = cur_buf + trigger_offset_bytes;
888 sr_session_send(devc->session_dev_id, &packet);
889
890 devc->num_samples += cur_sample_count;
891 if (devc->limit_samples &&
892 (unsigned int)devc->num_samples > devc->limit_samples) {
893 abort_acquisition(devc);
894 free_transfer(transfer);
895 return;
896 }
897 } else {
898 /*
899 * TODO: Buffer pre-trigger data in capture
900 * ratio-sized buffer.
901 */
902 }
903
904 resubmit_transfer(transfer);
905}
906
907static unsigned int to_bytes_per_ms(unsigned int samplerate)
908{
909 return samplerate / 1000;
910}
911
912static size_t get_buffer_size(struct dev_context *devc)
913{
914 size_t s;
915
916 /* The buffer should be large enough to hold 10ms of data and a multiple
917 * of 512. */
918 s = 10 * to_bytes_per_ms(devc->cur_samplerate);
919 return (s + 511) & ~511;
920}
921
922static unsigned int get_number_of_transfers(struct dev_context *devc)
923{
924 unsigned int n;
925
926 /* Total buffer size should be able to hold about 500ms of data */
927 n = 500 * to_bytes_per_ms(devc->cur_samplerate) / get_buffer_size(devc);
928
929 if (n > NUM_SIMUL_TRANSFERS)
930 return NUM_SIMUL_TRANSFERS;
931
932 return n;
933}
934
935static unsigned int get_timeout(struct dev_context *devc)
936{
937 size_t total_size;
938 unsigned int timeout;
939
940 total_size = get_buffer_size(devc) * get_number_of_transfers(devc);
941 timeout = total_size / to_bytes_per_ms(devc->cur_samplerate);
942 return timeout + timeout / 4; /* Leave a headroom of 25% percent */
943}
944
945static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
946 void *cb_data)
947{
948 struct sr_datafeed_packet packet;
949 struct sr_datafeed_header header;
950 struct sr_datafeed_meta_logic meta;
951 struct dev_context *devc;
952 struct drv_context *drvc = fdi->priv;
953 struct libusb_transfer *transfer;
954 const struct libusb_pollfd **lupfd;
955 unsigned int i;
956 int ret;
957 unsigned char *buf;
958
959 devc = sdi->priv;
960 if (devc->submitted_transfers != 0)
961 return SR_ERR;
962
963 if (configure_probes(sdi) != SR_OK) {
964 sr_err("fx2lafw: failed to configured probes");
965 return SR_ERR;
966 }
967
968 devc->session_dev_id = cb_data;
969 devc->num_samples = 0;
970 devc->empty_transfer_count = 0;
971
972 const unsigned int timeout = get_timeout(devc);
973 const unsigned int num_transfers = get_number_of_transfers(devc);
974 const size_t size = get_buffer_size(devc);
975
976 devc->transfers = g_try_malloc0(sizeof(*devc->transfers) * num_transfers);
977 if (!devc->transfers) {
978 sr_err("fx2lafw: USB transfers malloc failed.");
979 return SR_ERR_MALLOC;
980 }
981
982 devc->num_transfers = num_transfers;
983
984 for (i = 0; i < num_transfers; i++) {
985 if (!(buf = g_try_malloc(size))) {
986 sr_err("fx2lafw: %s: buf malloc failed.", __func__);
987 return SR_ERR_MALLOC;
988 }
989 transfer = libusb_alloc_transfer(0);
990 libusb_fill_bulk_transfer(transfer, devc->usb->devhdl,
991 2 | LIBUSB_ENDPOINT_IN, buf, size,
992 receive_transfer, devc, timeout);
993 if ((ret = libusb_submit_transfer(transfer)) != 0) {
994 sr_err("fx2lafw: %s: libusb_submit_transfer: %s.",
995 __func__, libusb_error_name(ret));
996 libusb_free_transfer(transfer);
997 g_free(buf);
998 abort_acquisition(devc);
999 return SR_ERR;
1000 }
1001 devc->transfers[i] = transfer;
1002 devc->submitted_transfers++;
1003 }
1004
1005 lupfd = libusb_get_pollfds(drvc->sr_ctx->libusb_ctx);
1006 for (i = 0; lupfd[i]; i++)
1007 sr_source_add(lupfd[i]->fd, lupfd[i]->events,
1008 timeout, receive_data, NULL);
1009 free(lupfd); /* NOT g_free()! */
1010
1011 packet.type = SR_DF_HEADER;
1012 packet.payload = &header;
1013 header.feed_version = 1;
1014 gettimeofday(&header.starttime, NULL);
1015 sr_session_send(cb_data, &packet);
1016
1017 /* Send metadata about the SR_DF_LOGIC packets to come. */
1018 packet.type = SR_DF_META_LOGIC;
1019 packet.payload = &meta;
1020 meta.samplerate = devc->cur_samplerate;
1021 meta.num_probes = devc->sample_wide ? 16 : 8;
1022 sr_session_send(cb_data, &packet);
1023
1024 if ((ret = command_start_acquisition (devc->usb->devhdl,
1025 devc->cur_samplerate, devc->sample_wide)) != SR_OK) {
1026 abort_acquisition(devc);
1027 return ret;
1028 }
1029
1030 return SR_OK;
1031}
1032
1033/* TODO: This stops acquisition on ALL devices, ignoring dev_index. */
1034static int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
1035{
1036 (void)cb_data;
1037
1038 abort_acquisition(sdi->priv);
1039
1040 return SR_OK;
1041}
1042
1043SR_PRIV struct sr_dev_driver fx2lafw_driver_info = {
1044 .name = "fx2lafw",
1045 .longname = "fx2lafw (generic driver for FX2 based LAs)",
1046 .api_version = 1,
1047 .init = hw_init,
1048 .cleanup = hw_cleanup,
1049 .scan = hw_scan,
1050 .dev_list = hw_dev_list,
1051 .dev_clear = clear_instances,
1052 .dev_open = hw_dev_open,
1053 .dev_close = hw_dev_close,
1054 .info_get = hw_info_get,
1055 .dev_config_set = hw_dev_config_set,
1056 .dev_acquisition_start = hw_dev_acquisition_start,
1057 .dev_acquisition_stop = hw_dev_acquisition_stop,
1058 .priv = NULL,
1059};
Hardware access and backend lib