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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 "sigrok.h"
28 #include "sigrok-internal.h"
29 #include "fx2lafw.h"
30 #include "command.h"
31 
32 static 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", 8 },
40 
41  /*
42  * CWAV USBee SX
43  */
44  { 0x08a9, 0x0009, "CWAV", "USBee SX", NULL,
45  FIRMWARE_DIR "/fx2lafw-cwav-usbeesx.fw", 8 },
46 
47  /*
48  * Saleae Logic
49  * EE Electronics ESLA100
50  * Robomotic MiniLogic
51  * Robomotic BugLogic 3
52  */
53  { 0x0925, 0x3881, "Saleae", "Logic", NULL,
54  FIRMWARE_DIR "/fx2lafw-saleae-logic.fw", 8 },
55 
56  /*
57  * Default Cypress FX2 without EEPROM, e.g.:
58  * Lcsoft Mini Board
59  * Braintechnology USB Interface V2.x
60  */
61  { 0x04B4, 0x8613, "Cypress", "FX2", NULL,
62  FIRMWARE_DIR "/fx2lafw-cypress-fx2.fw", 8 },
63 
64  /*
65  * Braintechnology USB-LPS
66  */
67  { 0x16d0, 0x0498, "Braintechnology", "USB-LPS", NULL,
68  FIRMWARE_DIR "/fx2lafw-braintechnology-usb-lps.fw", 8 },
69 
70  { 0, 0, 0, 0, 0, 0, 0 }
71 };
72 
73 static int hwcaps[] = {
76 
77  /* These are really implemented in the driver, not the hardware. */
80  0,
81 };
82 
83 /*
84  * TODO: Different probe_names[] for each supported device.
85  */
86 static const char *probe_names[] = {
87  "0",
88  "1",
89  "2",
90  "3",
91  "4",
92  "5",
93  "6",
94  "7",
95  NULL,
96 };
97 
98 static uint64_t supported_samplerates[] = {
99  SR_KHZ(20),
100  SR_KHZ(25),
101  SR_KHZ(50),
102  SR_KHZ(100),
103  SR_KHZ(200),
104  SR_KHZ(250),
105  SR_KHZ(500),
106  SR_MHZ(1),
107  SR_MHZ(2),
108  SR_MHZ(3),
109  SR_MHZ(4),
110  SR_MHZ(6),
111  SR_MHZ(8),
112  SR_MHZ(12),
113  SR_MHZ(16),
114  SR_MHZ(24),
115  0,
116 };
117 
118 static struct sr_samplerates samplerates = {
119  0,
120  0,
121  0,
122  supported_samplerates,
123 };
124 
125 static GSList *dev_insts = NULL;
126 static libusb_context *usb_context = NULL;
127 
128 static int hw_dev_config_set(int dev_index, int hwcap, void *value);
129 static int hw_dev_acquisition_stop(int dev_index, void *cb_data);
130 
131 /**
132  * Check the USB configuration to determine if this is an fx2lafw device.
133  *
134  * @return TRUE if the device's configuration profile match fx2lafw
135  * configuration, FALSE otherwise.
136  */
137 static gboolean check_conf_profile(libusb_device *dev)
138 {
139  struct libusb_device_descriptor des;
140  struct libusb_device_handle *hdl;
141  gboolean ret;
142  unsigned char strdesc[64];
143 
144  hdl = NULL;
145  ret = FALSE;
146  while (!ret) {
147  /* Assume the FW has not been loaded, unless proven wrong. */
148  if (libusb_get_device_descriptor(dev, &des) != 0)
149  break;
150 
151  if (libusb_open(dev, &hdl) != 0)
152  break;
153 
154  if (libusb_get_string_descriptor_ascii(hdl,
155  des.iManufacturer, strdesc, sizeof(strdesc)) < 0)
156  break;
157  if (strncmp((const char *)strdesc, "sigrok", 6))
158  break;
159 
160  if (libusb_get_string_descriptor_ascii(hdl,
161  des.iProduct, strdesc, sizeof(strdesc)) < 0)
162  break;
163  if (strncmp((const char *)strdesc, "fx2lafw", 7))
164  break;
165 
166  /* If we made it here, it must be an fx2lafw. */
167  ret = TRUE;
168  }
169  if (hdl)
170  libusb_close(hdl);
171 
172  return ret;
173 }
174 
175 static int fx2lafw_dev_open(int dev_index)
176 {
177  libusb_device **devlist;
178  struct libusb_device_descriptor des;
179  struct sr_dev_inst *sdi;
180  struct context *ctx;
181  struct version_info vi;
182  int ret, skip, i;
183  uint8_t revid;
184 
185  if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
186  return SR_ERR;
187  ctx = sdi->priv;
188 
189  if (sdi->status == SR_ST_ACTIVE)
190  /* already in use */
191  return SR_ERR;
192 
193  skip = 0;
194  const int device_count = libusb_get_device_list(usb_context, &devlist);
195  if (device_count < 0) {
196  sr_err("fx2lafw: Failed to retrieve device list (%d)",
197  device_count);
198  return SR_ERR;
199  }
200 
201  for (i = 0; i < device_count; i++) {
202  if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
203  sr_err("fx2lafw: Failed to get device descriptor: %d.",
204  ret);
205  continue;
206  }
207 
208  if (des.idVendor != ctx->profile->vid
209  || des.idProduct != ctx->profile->pid)
210  continue;
211 
212  if (sdi->status == SR_ST_INITIALIZING) {
213  if (skip != dev_index) {
214  /* Skip devices of this type that aren't the one we want. */
215  skip += 1;
216  continue;
217  }
218  } else if (sdi->status == SR_ST_INACTIVE) {
219  /*
220  * This device is fully enumerated, so we need to find
221  * this device by vendor, product, bus and address.
222  */
223  if (libusb_get_bus_number(devlist[i]) != ctx->usb->bus
224  || libusb_get_device_address(devlist[i]) != ctx->usb->address)
225  /* this is not the one */
226  continue;
227  }
228 
229  if (!(ret = libusb_open(devlist[i], &ctx->usb->devhdl))) {
230  if (ctx->usb->address == 0xff)
231  /*
232  * first time we touch this device after firmware upload,
233  * so we don't know the address yet.
234  */
235  ctx->usb->address = libusb_get_device_address(devlist[i]);
236  } else {
237  sr_err("fx2lafw: Failed to open device: %d.", ret);
238  break;
239  }
240 
241  ret = command_get_fw_version(ctx->usb->devhdl, &vi);
242  if (ret != SR_OK) {
243  sr_err("fx2lafw: Failed to retrieve "
244  "firmware version information.");
245  break;
246  }
247 
248  ret = command_get_revid_version(ctx->usb->devhdl, &revid);
249  if (ret != SR_OK) {
250  sr_err("fx2lafw: Failed to retrieve REVID.");
251  break;
252  }
253 
254  /*
255  * Changes in major version mean incompatible/API changes, so
256  * bail out if we encounter an incompatible version.
257  * Different minor versions are OK, they should be compatible.
258  */
259  if (vi.major != FX2LAFW_REQUIRED_VERSION_MAJOR) {
260  sr_err("fx2lafw: Expected firmware version %d.x, "
261  "got %d.%d.", FX2LAFW_REQUIRED_VERSION_MAJOR,
262  vi.major, vi.minor);
263  break;
264  }
265 
266  sdi->status = SR_ST_ACTIVE;
267  sr_info("fx2lafw: Opened device %d on %d.%d "
268  "interface %d, firmware %d.%d, REVID %d.",
269  sdi->index, ctx->usb->bus, ctx->usb->address,
270  USB_INTERFACE, vi.major, vi.minor, revid);
271 
272  break;
273  }
274  libusb_free_device_list(devlist, 1);
275 
276  if (sdi->status != SR_ST_ACTIVE)
277  return SR_ERR;
278 
279  return SR_OK;
280 }
281 
282 static void close_dev(struct sr_dev_inst *sdi)
283 {
284  struct context *ctx;
285 
286  ctx = sdi->priv;
287 
288  if (ctx->usb->devhdl == NULL)
289  return;
290 
291  sr_info("fx2lafw: Closing device %d on %d.%d interface %d.",
292  sdi->index, ctx->usb->bus, ctx->usb->address, USB_INTERFACE);
293  libusb_release_interface(ctx->usb->devhdl, USB_INTERFACE);
294  libusb_close(ctx->usb->devhdl);
295  ctx->usb->devhdl = NULL;
296  sdi->status = SR_ST_INACTIVE;
297 }
298 
299 static int configure_probes(struct context *ctx, GSList *probes)
300 {
301  struct sr_probe *probe;
302  GSList *l;
303  int probe_bit, stage, i;
304  char *tc;
305 
306  for (i = 0; i < NUM_TRIGGER_STAGES; i++) {
307  ctx->trigger_mask[i] = 0;
308  ctx->trigger_value[i] = 0;
309  }
310 
311  stage = -1;
312  for (l = probes; l; l = l->next) {
313  probe = (struct sr_probe *)l->data;
314  if (probe->enabled == FALSE)
315  continue;
316  probe_bit = 1 << (probe->index - 1);
317  if (!(probe->trigger))
318  continue;
319 
320  stage = 0;
321  for (tc = probe->trigger; *tc; tc++) {
322  ctx->trigger_mask[stage] |= probe_bit;
323  if (*tc == '1')
324  ctx->trigger_value[stage] |= probe_bit;
325  stage++;
326  if (stage > NUM_TRIGGER_STAGES)
327  return SR_ERR;
328  }
329  }
330 
331  if (stage == -1)
332  /*
333  * We didn't configure any triggers, make sure acquisition
334  * doesn't wait for any.
335  */
337  else
338  ctx->trigger_stage = 0;
339 
340  return SR_OK;
341 }
342 
343 static struct context *fx2lafw_dev_new(void)
344 {
345  struct context *ctx;
346 
347  if (!(ctx = g_try_malloc0(sizeof(struct context)))) {
348  sr_err("fx2lafw: %s: ctx malloc failed.", __func__);
349  return NULL;
350  }
351 
353 
354  return ctx;
355 }
356 
357 /*
358  * API callbacks
359  */
360 
361 static int hw_init(const char *devinfo)
362 {
363  struct sr_dev_inst *sdi;
364  struct libusb_device_descriptor des;
365  const struct fx2lafw_profile *prof;
366  struct context *ctx;
367  libusb_device **devlist;
368  int ret;
369  int devcnt = 0;
370  int i, j;
371 
372  /* Avoid compiler warnings. */
373  (void)devinfo;
374 
375  if (libusb_init(&usb_context) != 0) {
376  sr_warn("fx2lafw: Failed to initialize libusb.");
377  return 0;
378  }
379 
380  /* Find all fx2lafw compatible devices and upload firmware to them. */
381  libusb_get_device_list(usb_context, &devlist);
382  for (i = 0; devlist[i]; i++) {
383 
384  if ((ret = libusb_get_device_descriptor(
385  devlist[i], &des)) != 0) {
386  sr_warn("fx2lafw: Failed to get device descriptor: %d.", ret);
387  continue;
388  }
389 
390  prof = NULL;
391  for (j = 0; supported_fx2[j].vid; j++) {
392  if (des.idVendor == supported_fx2[j].vid &&
393  des.idProduct == supported_fx2[j].pid) {
394  prof = &supported_fx2[j];
395  }
396  }
397 
398  /* Skip if the device was not found */
399  if (!prof)
400  continue;
401 
402  sdi = sr_dev_inst_new(devcnt, SR_ST_INITIALIZING,
403  prof->vendor, prof->model, prof->model_version);
404  if (!sdi)
405  return 0;
406 
407  ctx = fx2lafw_dev_new();
408  ctx->profile = prof;
409  sdi->priv = ctx;
410  dev_insts = g_slist_append(dev_insts, sdi);
411 
412  if (check_conf_profile(devlist[i])) {
413  /* Already has the firmware, so fix the new address. */
414  sr_dbg("fx2lafw: Found an fx2lafw device.");
415  sdi->status = SR_ST_INACTIVE;
416  ctx->usb = sr_usb_dev_inst_new
417  (libusb_get_bus_number(devlist[i]),
418  libusb_get_device_address(devlist[i]), NULL);
419  } else {
421  prof->firmware) == SR_OK)
422  /* Remember when the firmware on this device was updated */
423  ctx->fw_updated = g_get_monotonic_time();
424  else
425  sr_err("fx2lafw: Firmware upload failed for "
426  "device %d.", devcnt);
427  ctx->usb = sr_usb_dev_inst_new
428  (libusb_get_bus_number(devlist[i]), 0xff, NULL);
429  }
430 
431  devcnt++;
432  }
433  libusb_free_device_list(devlist, 1);
434 
435  return devcnt;
436 }
437 
438 static int hw_dev_open(int dev_index)
439 {
440  struct sr_dev_inst *sdi;
441  struct context *ctx;
442  int ret;
443  int64_t timediff_us, timediff_ms;
444 
445  if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
446  return SR_ERR;
447  ctx = sdi->priv;
448 
449  /*
450  * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
451  * milliseconds for the FX2 to renumerate.
452  */
453  ret = 0;
454 
455  if (ctx->fw_updated > 0) {
456  sr_info("fx2lafw: Waiting for device to reset.");
457  /* takes at least 300ms for the FX2 to be gone from the USB bus */
458  g_usleep(300 * 1000);
459  timediff_ms = 0;
460  while (timediff_ms < MAX_RENUM_DELAY_MS) {
461  if ((ret = fx2lafw_dev_open(dev_index)) == SR_OK)
462  break;
463  g_usleep(100 * 1000);
464 
465  timediff_us = g_get_monotonic_time() - ctx->fw_updated;
466  timediff_ms = timediff_us / G_USEC_PER_SEC;
467  sr_spew("fx2lafw: timediff: %" PRIi64 " us.",
468  timediff_us);
469  }
470  sr_info("fx2lafw: Device came back after %d ms.", timediff_ms);
471  } else {
472  ret = fx2lafw_dev_open(dev_index);
473  }
474 
475  if (ret != SR_OK) {
476  sr_err("fx2lafw: Unable to open device.");
477  return SR_ERR;
478  }
479  ctx = sdi->priv;
480 
481  ret = libusb_claim_interface(ctx->usb->devhdl, USB_INTERFACE);
482  if (ret != 0) {
483  sr_err("fx2lafw: Unable to claim interface: %d.", ret);
484  return SR_ERR;
485  }
486 
487  if (ctx->cur_samplerate == 0) {
488  /* Samplerate hasn't been set; default to the slowest one. */
489  if (hw_dev_config_set(dev_index, SR_HWCAP_SAMPLERATE,
490  &supported_samplerates[0]) == SR_ERR)
491  return SR_ERR;
492  }
493 
494  return SR_OK;
495 }
496 
497 static int hw_dev_close(int dev_index)
498 {
499  struct sr_dev_inst *sdi;
500 
501  if (!(sdi = sr_dev_inst_get(dev_insts, dev_index))) {
502  sr_err("fx2lafw: %s: sdi was NULL.", __func__);
503  return SR_ERR_BUG;
504  }
505 
506  /* TODO */
507  close_dev(sdi);
508 
509  return SR_OK;
510 }
511 
512 static int hw_cleanup(void)
513 {
514  GSList *l;
515  struct sr_dev_inst *sdi;
516  struct context *ctx;
517  int ret = SR_OK;
518 
519  for (l = dev_insts; l; l = l->next) {
520  if (!(sdi = l->data)) {
521  /* Log error, but continue cleaning up the rest. */
522  sr_err("fx2lafw: %s: sdi was NULL, continuing.",
523  __func__);
524  ret = SR_ERR_BUG;
525  continue;
526  }
527  if (!(ctx = sdi->priv)) {
528  /* Log error, but continue cleaning up the rest. */
529  sr_err("fx2lafw: %s: sdi->priv was NULL, continuing",
530  __func__);
531  ret = SR_ERR_BUG;
532  continue;
533  }
534  close_dev(sdi);
535  sdi = l->data;
536  sr_dev_inst_free(sdi);
537  }
538 
539  g_slist_free(dev_insts);
540  dev_insts = NULL;
541 
542  if (usb_context)
543  libusb_exit(usb_context);
544  usb_context = NULL;
545 
546  return ret;
547 }
548 
549 static void *hw_dev_info_get(int dev_index, int dev_info_id)
550 {
551  struct sr_dev_inst *sdi;
552  struct context *ctx;
553 
554  if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
555  return NULL;
556  ctx = sdi->priv;
557 
558  switch (dev_info_id) {
559  case SR_DI_INST:
560  return sdi;
561  case SR_DI_NUM_PROBES:
562  return GINT_TO_POINTER(ctx->profile->num_probes);
563  case SR_DI_PROBE_NAMES:
564  return probe_names;
565  case SR_DI_SAMPLERATES:
566  return &samplerates;
567  case SR_DI_TRIGGER_TYPES:
568  return TRIGGER_TYPES;
570  return &ctx->cur_samplerate;
571  }
572 
573  return NULL;
574 }
575 
576 static int hw_dev_status_get(int dev_index)
577 {
578  const struct sr_dev_inst *const sdi =
579  sr_dev_inst_get(dev_insts, dev_index);
580 
581  if (!sdi)
582  return SR_ST_NOT_FOUND;
583 
584  return sdi->status;
585 }
586 
587 static int *hw_hwcap_get_all(void)
588 {
589  return hwcaps;
590 }
591 
592 static int hw_dev_config_set(int dev_index, int hwcap, void *value)
593 {
594  struct sr_dev_inst *sdi;
595  struct context *ctx;
596  int ret;
597 
598  if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
599  return SR_ERR;
600  ctx = sdi->priv;
601 
602  if (hwcap == SR_HWCAP_SAMPLERATE) {
603  ctx->cur_samplerate = *(uint64_t *)value;
604  ret = SR_OK;
605  } else if (hwcap == SR_HWCAP_PROBECONFIG) {
606  ret = configure_probes(ctx, (GSList *) value);
607  } else if (hwcap == SR_HWCAP_LIMIT_SAMPLES) {
608  ctx->limit_samples = *(uint64_t *)value;
609  ret = SR_OK;
610  } else {
611  ret = SR_ERR;
612  }
613 
614  return ret;
615 }
616 
617 static int receive_data(int fd, int revents, void *cb_data)
618 {
619  struct timeval tv;
620 
621  /* Avoid compiler warnings. */
622  (void)fd;
623  (void)revents;
624  (void)cb_data;
625 
626  tv.tv_sec = tv.tv_usec = 0;
627  libusb_handle_events_timeout(usb_context, &tv);
628 
629  return TRUE;
630 }
631 
632 static void abort_acquisition(struct context *ctx)
633 {
634  ctx->num_samples = -1;
635 }
636 
637 static void finish_acquisition(struct context *ctx)
638 {
639  struct sr_datafeed_packet packet;
640  int i;
641 
642  /* Terminate session */
643  packet.type = SR_DF_END;
644  sr_session_send(ctx->session_dev_id, &packet);
645 
646  /* Remove fds from polling */
647  const struct libusb_pollfd **const lupfd =
648  libusb_get_pollfds(usb_context);
649  for (i = 0; lupfd[i]; i++)
650  sr_source_remove(lupfd[i]->fd);
651  free(lupfd); /* NOT g_free()! */
652 }
653 
654 static void receive_transfer(struct libusb_transfer *transfer)
655 {
656  /* TODO: These statics have to move to the ctx struct. */
657  static int empty_transfer_count = 0;
658  struct sr_datafeed_packet packet;
659  struct sr_datafeed_logic logic;
660  struct context *ctx = transfer->user_data;
661  int cur_buflen, trigger_offset, i;
662  unsigned char *cur_buf, *new_buf;
663 
664  /*
665  * If acquisition has already ended, just free any queued up
666  * transfer that come in.
667  */
668  if (ctx->num_samples == -1) {
669  if (transfer)
670  libusb_free_transfer(transfer);
671 
672  ctx->submitted_transfers--;
673  if (ctx->submitted_transfers == 0)
674  finish_acquisition(ctx);
675 
676  return;
677  }
678 
679  sr_info("fx2lafw: receive_transfer(): status %d received %d bytes.",
680  transfer->status, transfer->actual_length);
681 
682  /* Save incoming transfer before reusing the transfer struct. */
683  cur_buf = transfer->buffer;
684  cur_buflen = transfer->actual_length;
685 
686  /* Fire off a new request. */
687  if (!(new_buf = g_try_malloc(4096))) {
688  sr_err("fx2lafw: %s: new_buf malloc failed.", __func__);
689  return; /* TODO: SR_ERR_MALLOC */
690  }
691 
692  transfer->buffer = new_buf;
693  transfer->length = 4096;
694  if (libusb_submit_transfer(transfer) != 0) {
695  /* TODO: Stop session? */
696  /* TODO: Better error message. */
697  sr_err("fx2lafw: %s: libusb_submit_transfer error.", __func__);
698  }
699 
700  if (cur_buflen == 0) {
701  empty_transfer_count++;
702  if (empty_transfer_count > MAX_EMPTY_TRANSFERS) {
703  /*
704  * The FX2 gave up. End the acquisition, the frontend
705  * will work out that the samplecount is short.
706  */
707  abort_acquisition(ctx);
708  }
709  return;
710  } else {
711  empty_transfer_count = 0;
712  }
713 
714  trigger_offset = 0;
715  if (ctx->trigger_stage >= 0) {
716  for (i = 0; i < cur_buflen; i++) {
717 
718  if ((cur_buf[i] & ctx->trigger_mask[ctx->trigger_stage]) == ctx->trigger_value[ctx->trigger_stage]) {
719  /* Match on this trigger stage. */
720  ctx->trigger_buffer[ctx->trigger_stage] = cur_buf[i];
721  ctx->trigger_stage++;
722 
723  if (ctx->trigger_stage == NUM_TRIGGER_STAGES || ctx->trigger_mask[ctx->trigger_stage] == 0) {
724  /* Match on all trigger stages, we're done. */
725  trigger_offset = i + 1;
726 
727  /*
728  * TODO: Send pre-trigger buffer to session bus.
729  * Tell the frontend we hit the trigger here.
730  */
731  packet.type = SR_DF_TRIGGER;
732  packet.payload = NULL;
733  sr_session_send(ctx->session_dev_id, &packet);
734 
735  /*
736  * Send the samples that triggered it, since we're
737  * skipping past them.
738  */
739  packet.type = SR_DF_LOGIC;
740  packet.payload = &logic;
741  logic.length = ctx->trigger_stage;
742  logic.unitsize = 1;
743  logic.data = ctx->trigger_buffer;
744  sr_session_send(ctx->session_dev_id, &packet);
745 
747  break;
748  }
749  return;
750  }
751 
752  /*
753  * We had a match before, but not in the next sample. However, we may
754  * have a match on this stage in the next bit -- trigger on 0001 will
755  * fail on seeing 00001, so we need to go back to stage 0 -- but at
756  * the next sample from the one that matched originally, which the
757  * counter increment at the end of the loop takes care of.
758  */
759  if (ctx->trigger_stage > 0) {
760  i -= ctx->trigger_stage;
761  if (i < -1)
762  i = -1; /* Oops, went back past this buffer. */
763  /* Reset trigger stage. */
764  ctx->trigger_stage = 0;
765  }
766  }
767  }
768 
769  if (ctx->trigger_stage == TRIGGER_FIRED) {
770  /* Send the incoming transfer to the session bus. */
771  packet.type = SR_DF_LOGIC;
772  packet.payload = &logic;
773  logic.length = cur_buflen - trigger_offset;
774  logic.unitsize = 1;
775  logic.data = cur_buf + trigger_offset;
776  sr_session_send(ctx->session_dev_id, &packet);
777  g_free(cur_buf);
778 
779  ctx->num_samples += cur_buflen;
780  if (ctx->limit_samples &&
781  (unsigned int)ctx->num_samples > ctx->limit_samples) {
782  abort_acquisition(ctx);
783  }
784  } else {
785  /*
786  * TODO: Buffer pre-trigger data in capture
787  * ratio-sized buffer.
788  */
789  }
790 }
791 
792 static int hw_dev_acquisition_start(int dev_index, void *cb_data)
793 {
794  struct sr_dev_inst *sdi;
795  struct sr_datafeed_packet *packet;
796  struct sr_datafeed_header *header;
797  struct context *ctx;
798  struct libusb_transfer *transfer;
799  const struct libusb_pollfd **lupfd;
800  int ret, size, i;
801  unsigned char *buf;
802 
803  if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
804  return SR_ERR;
805  ctx = sdi->priv;
806  ctx->session_dev_id = cb_data;
807  ctx->num_samples = 0;
808 
809  if (!(packet = g_try_malloc(sizeof(struct sr_datafeed_packet)))) {
810  sr_err("fx2lafw: %s: packet malloc failed.", __func__);
811  return SR_ERR_MALLOC;
812  }
813 
814  if (!(header = g_try_malloc(sizeof(struct sr_datafeed_header)))) {
815  sr_err("fx2lafw: %s: header malloc failed.", __func__);
816  return SR_ERR_MALLOC;
817  }
818 
819  /* Start with 2K transfer, subsequently increased to 4K. */
820  size = 2048;
821  for (i = 0; i < NUM_SIMUL_TRANSFERS; i++) {
822  if (!(buf = g_try_malloc(size))) {
823  sr_err("fx2lafw: %s: buf malloc failed.", __func__);
824  return SR_ERR_MALLOC;
825  }
826  transfer = libusb_alloc_transfer(0);
827  libusb_fill_bulk_transfer(transfer, ctx->usb->devhdl,
828  2 | LIBUSB_ENDPOINT_IN, buf, size,
829  receive_transfer, ctx, 40);
830  if (libusb_submit_transfer(transfer) != 0) {
831  /* TODO: Free them all. */
832  libusb_free_transfer(transfer);
833  g_free(buf);
834  return SR_ERR;
835  }
836 
837  ctx->submitted_transfers++;
838  size = 4096;
839  }
840 
841  lupfd = libusb_get_pollfds(usb_context);
842  for (i = 0; lupfd[i]; i++)
843  sr_source_add(lupfd[i]->fd, lupfd[i]->events,
844  40, receive_data, NULL);
845  free(lupfd); /* NOT g_free()! */
846 
847  packet->type = SR_DF_HEADER;
848  packet->payload = header;
849  header->feed_version = 1;
850  gettimeofday(&header->starttime, NULL);
851  header->samplerate = ctx->cur_samplerate;
852  header->num_logic_probes = ctx->profile->num_probes;
853  sr_session_send(cb_data, packet);
854  g_free(header);
855  g_free(packet);
856 
857  if ((ret = command_start_acquisition (ctx->usb->devhdl,
858  ctx->cur_samplerate)) != SR_OK) {
859  return ret;
860  }
861 
862  return SR_OK;
863 }
864 
865 /* TODO: This stops acquisition on ALL devices, ignoring dev_index. */
866 static int hw_dev_acquisition_stop(int dev_index, void *cb_data)
867 {
868  struct sr_dev_inst *sdi;
869 
870  /* Avoid compiler warnings. */
871  (void)cb_data;
872 
873  if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
874  return SR_ERR;
875 
876  abort_acquisition(sdi->priv);
877 
878  return SR_OK;
879 }
880 
882  .name = "fx2lafw",
883  .longname = "fx2lafw (generic driver for FX2 based LAs)",
884  .api_version = 1,
885  .init = hw_init,
886  .cleanup = hw_cleanup,
887  .dev_open = hw_dev_open,
888  .dev_close = hw_dev_close,
889  .dev_info_get = hw_dev_info_get,
890  .dev_status_get = hw_dev_status_get,
891  .hwcap_get_all = hw_hwcap_get_all,
892  .dev_config_set = hw_dev_config_set,
893  .dev_acquisition_start = hw_dev_acquisition_start,
894  .dev_acquisition_stop = hw_dev_acquisition_stop,
895 };