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