kingst-la2016: handle sdi==NULL in config_list
[libsigrok.git] / src / hardware / saleae-logic16 / api.c
1 /*
2  * This file is part of the libsigrok project.
3  *
4  * Copyright (C) 2013 Marcus Comstedt <marcus@mc.pp.se>
5  * Copyright (C) 2013 Bert Vermeulen <bert@biot.com>
6  * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
7  *
8  * This program is free software: you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License as published by
10  * the Free Software Foundation, either version 3 of the License, or
11  * (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
20  */
21
22 #include <config.h>
23 #include <glib.h>
24 #include <libusb.h>
25 #include <stdlib.h>
26 #include <string.h>
27 #include <math.h>
28 #include <libsigrok/libsigrok.h>
29 #include "libsigrok-internal.h"
30 #include "protocol.h"
31
32 #define LOGIC16_VID             0x21a9
33 #define LOGIC16_PID             0x1001
34
35 #define USB_INTERFACE           0
36 #define USB_CONFIGURATION       1
37 #define FX2_FIRMWARE            "saleae-logic16-fx2.fw"
38
39 #define MAX_RENUM_DELAY_MS      3000
40 #define NUM_SIMUL_TRANSFERS     32
41
42 static const uint32_t scanopts[] = {
43         SR_CONF_CONN,
44 };
45
46 static const uint32_t drvopts[] = {
47         SR_CONF_LOGIC_ANALYZER,
48 };
49
50 static const uint32_t devopts[] = {
51         SR_CONF_CONTINUOUS,
52         SR_CONF_LIMIT_SAMPLES | SR_CONF_SET,
53         SR_CONF_CONN | SR_CONF_GET,
54         SR_CONF_SAMPLERATE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
55         SR_CONF_VOLTAGE_THRESHOLD | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
56         SR_CONF_TRIGGER_MATCH | SR_CONF_LIST,
57         SR_CONF_CAPTURE_RATIO | SR_CONF_GET | SR_CONF_SET,
58 };
59
60 static const int32_t trigger_matches[] = {
61         SR_TRIGGER_ZERO,
62         SR_TRIGGER_ONE,
63         SR_TRIGGER_RISING,
64         SR_TRIGGER_FALLING,
65         SR_TRIGGER_EDGE,
66 };
67
68 static const char *channel_names[] = {
69         "0", "1", "2", "3", "4", "5", "6", "7", "8",
70         "9", "10", "11", "12", "13", "14", "15",
71 };
72
73 static const struct {
74         enum voltage_range range;
75 } thresholds_ranges[] = {
76         { VOLTAGE_RANGE_18_33_V, },
77         { VOLTAGE_RANGE_5_V, },
78 };
79
80 static const double thresholds[][2] = {
81         { 0.7, 1.4 },
82         { 1.4, 3.6 },
83 };
84
85 static const uint64_t samplerates[] = {
86         SR_KHZ(500),
87         SR_MHZ(1),
88         SR_MHZ(2),
89         SR_MHZ(4),
90         SR_MHZ(5),
91         SR_MHZ(8),
92         SR_MHZ(10),
93         SR_KHZ(12500),
94         SR_MHZ(16),
95         SR_MHZ(20),
96         SR_MHZ(25),
97         SR_MHZ(32),
98         SR_MHZ(40),
99         SR_MHZ(50),
100         SR_MHZ(80),
101         SR_MHZ(100),
102 };
103
104 static gboolean check_conf_profile(libusb_device *dev)
105 {
106         struct libusb_device_descriptor des;
107         struct libusb_device_handle *hdl;
108         gboolean ret;
109         unsigned char strdesc[64];
110
111         hdl = NULL;
112         ret = FALSE;
113         while (!ret) {
114                 /* Assume the FW has not been loaded, unless proven wrong. */
115                 libusb_get_device_descriptor(dev, &des);
116
117                 if (libusb_open(dev, &hdl) != 0)
118                         break;
119
120                 if (libusb_get_string_descriptor_ascii(hdl,
121                     des.iManufacturer, strdesc, sizeof(strdesc)) < 0)
122                         break;
123                 if (strcmp((const char *)strdesc, "Saleae LLC"))
124                         break;
125
126                 if (libusb_get_string_descriptor_ascii(hdl,
127                     des.iProduct, strdesc, sizeof(strdesc)) < 0)
128                         break;
129                 if (strcmp((const char *)strdesc, "Logic S/16"))
130                         break;
131
132                 /* If we made it here, it must be a configured Logic16. */
133                 ret = TRUE;
134         }
135         if (hdl)
136                 libusb_close(hdl);
137
138         return ret;
139 }
140
141 static GSList *scan(struct sr_dev_driver *di, GSList *options)
142 {
143         struct drv_context *drvc;
144         struct dev_context *devc;
145         struct sr_dev_inst *sdi;
146         struct sr_usb_dev_inst *usb;
147         struct sr_config *src;
148         GSList *l, *devices, *conn_devices;
149         struct libusb_device_descriptor des;
150         libusb_device **devlist;
151         unsigned int i, j;
152         const char *conn;
153         char connection_id[64];
154
155         drvc = di->context;
156
157         conn = NULL;
158         for (l = options; l; l = l->next) {
159                 src = l->data;
160                 switch (src->key) {
161                 case SR_CONF_CONN:
162                         conn = g_variant_get_string(src->data, NULL);
163                         break;
164                 }
165         }
166         if (conn)
167                 conn_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn);
168         else
169                 conn_devices = NULL;
170
171         /* Find all Logic16 devices and upload firmware to them. */
172         devices = NULL;
173         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
174         for (i = 0; devlist[i]; i++) {
175                 if (conn) {
176                         usb = NULL;
177                         for (l = conn_devices; l; l = l->next) {
178                                 usb = l->data;
179                                 if (usb->bus == libusb_get_bus_number(devlist[i])
180                                     && usb->address == libusb_get_device_address(devlist[i]))
181                                         break;
182                         }
183                         if (!l)
184                                 /* This device matched none of the ones that
185                                  * matched the conn specification. */
186                                 continue;
187                 }
188
189                 libusb_get_device_descriptor(devlist[i], &des);
190
191                 if (usb_get_port_path(devlist[i], connection_id, sizeof(connection_id)) < 0)
192                         continue;
193
194                 if (des.idVendor != LOGIC16_VID || des.idProduct != LOGIC16_PID)
195                         continue;
196
197                 sdi = g_malloc0(sizeof(struct sr_dev_inst));
198                 sdi->status = SR_ST_INITIALIZING;
199                 sdi->vendor = g_strdup("Saleae");
200                 sdi->model = g_strdup("Logic16");
201                 sdi->connection_id = g_strdup(connection_id);
202
203                 for (j = 0; j < ARRAY_SIZE(channel_names); j++)
204                         sr_channel_new(sdi, j, SR_CHANNEL_LOGIC, TRUE,
205                                         channel_names[j]);
206
207                 devc = g_malloc0(sizeof(struct dev_context));
208                 devc->selected_voltage_range = VOLTAGE_RANGE_18_33_V;
209                 sdi->priv = devc;
210                 devices = g_slist_append(devices, sdi);
211
212                 if (check_conf_profile(devlist[i])) {
213                         /* Already has the firmware, so fix the new address. */
214                         sr_dbg("Found a Logic16 device.");
215                         sdi->status = SR_ST_INACTIVE;
216                         sdi->inst_type = SR_INST_USB;
217                         sdi->conn = sr_usb_dev_inst_new(
218                                 libusb_get_bus_number(devlist[i]),
219                                 libusb_get_device_address(devlist[i]), NULL);
220                 } else {
221                         if (ezusb_upload_firmware(drvc->sr_ctx, devlist[i],
222                                         USB_CONFIGURATION, FX2_FIRMWARE) == SR_OK) {
223                                 /* Store when this device's FW was updated. */
224                                 devc->fw_updated = g_get_monotonic_time();
225                         } else {
226                                 sr_err("Firmware upload failed, name %s.", FX2_FIRMWARE);
227                         }
228                         sdi->inst_type = SR_INST_USB;
229                         sdi->conn = sr_usb_dev_inst_new(
230                                 libusb_get_bus_number(devlist[i]), 0xff, NULL);
231                 }
232         }
233         libusb_free_device_list(devlist, 1);
234         g_slist_free_full(conn_devices, (GDestroyNotify)sr_usb_dev_inst_free);
235
236         return std_scan_complete(di, devices);
237 }
238
239 static int logic16_dev_open(struct sr_dev_inst *sdi)
240 {
241         struct sr_dev_driver *di;
242         libusb_device **devlist;
243         struct sr_usb_dev_inst *usb;
244         struct libusb_device_descriptor des;
245         struct drv_context *drvc;
246         int ret = SR_ERR, i, device_count;
247         char connection_id[64];
248
249         di = sdi->driver;
250         drvc = di->context;
251         usb = sdi->conn;
252
253         device_count = libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
254         if (device_count < 0) {
255                 sr_err("Failed to get device list: %s.",
256                        libusb_error_name(device_count));
257                 return SR_ERR;
258         }
259
260         for (i = 0; i < device_count; i++) {
261                 libusb_get_device_descriptor(devlist[i], &des);
262
263                 if (des.idVendor != LOGIC16_VID || des.idProduct != LOGIC16_PID)
264                         continue;
265
266                 if ((sdi->status == SR_ST_INITIALIZING) ||
267                                 (sdi->status == SR_ST_INACTIVE)) {
268                         /*
269                          * Check device by its physical USB bus/port address.
270                          */
271                         if (usb_get_port_path(devlist[i], connection_id, sizeof(connection_id)) < 0)
272                                 continue;
273
274                         if (strcmp(sdi->connection_id, connection_id))
275                                 /* This is not the one. */
276                                 continue;
277                 }
278
279                 if (!(ret = libusb_open(devlist[i], &usb->devhdl))) {
280                         if (usb->address == 0xff)
281                                 /*
282                                  * First time we touch this device after FW
283                                  * upload, so we don't know the address yet.
284                                  */
285                                 usb->address = libusb_get_device_address(devlist[i]);
286                 } else {
287                         sr_err("Failed to open device: %s.",
288                                libusb_error_name(ret));
289                         ret = SR_ERR;
290                         break;
291                 }
292
293                 ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
294                 if (ret == LIBUSB_ERROR_BUSY) {
295                         sr_err("Unable to claim USB interface. Another "
296                                "program or driver has already claimed it.");
297                         ret = SR_ERR;
298                         break;
299                 } else if (ret == LIBUSB_ERROR_NO_DEVICE) {
300                         sr_err("Device has been disconnected.");
301                         ret = SR_ERR;
302                         break;
303                 } else if (ret != 0) {
304                         sr_err("Unable to claim interface: %s.",
305                                libusb_error_name(ret));
306                         ret = SR_ERR;
307                         break;
308                 }
309
310                 if ((ret = logic16_init_device(sdi)) != SR_OK) {
311                         sr_err("Failed to init device.");
312                         break;
313                 }
314
315                 sr_info("Opened device on %d.%d (logical) / %s (physical), interface %d.",
316                         usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
317
318                 ret = SR_OK;
319
320                 break;
321         }
322
323         libusb_free_device_list(devlist, 1);
324
325         if (ret != SR_OK) {
326                 if (usb->devhdl) {
327                         libusb_release_interface(usb->devhdl, USB_INTERFACE);
328                         libusb_close(usb->devhdl);
329                         usb->devhdl = NULL;
330                 }
331                 return SR_ERR;
332         }
333
334         return SR_OK;
335 }
336
337 static int dev_open(struct sr_dev_inst *sdi)
338 {
339         struct dev_context *devc;
340         int ret;
341         int64_t timediff_us, timediff_ms;
342
343         devc = sdi->priv;
344
345         /*
346          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
347          * milliseconds for the FX2 to renumerate.
348          */
349         ret = SR_ERR;
350         if (devc->fw_updated > 0) {
351                 sr_info("Waiting for device to reset.");
352                 /* Takes >= 300ms for the FX2 to be gone from the USB bus. */
353                 g_usleep(300 * 1000);
354                 timediff_ms = 0;
355                 while (timediff_ms < MAX_RENUM_DELAY_MS) {
356                         if ((ret = logic16_dev_open(sdi)) == SR_OK)
357                                 break;
358                         g_usleep(100 * 1000);
359
360                         timediff_us = g_get_monotonic_time() - devc->fw_updated;
361                         timediff_ms = timediff_us / 1000;
362                         sr_spew("Waited %" PRIi64 "ms.", timediff_ms);
363                 }
364                 if (ret != SR_OK) {
365                         sr_err("Device failed to renumerate.");
366                         return SR_ERR;
367                 }
368                 sr_info("Device came back after %" PRIi64 "ms.", timediff_ms);
369         } else {
370                 sr_info("Firmware upload was not needed.");
371                 ret = logic16_dev_open(sdi);
372         }
373
374         if (ret != SR_OK) {
375                 sr_err("Unable to open device.");
376                 return SR_ERR;
377         }
378
379         if (devc->cur_samplerate == 0) {
380                 /* Samplerate hasn't been set; default to the slowest one. */
381                 devc->cur_samplerate = samplerates[0];
382         }
383
384         return SR_OK;
385 }
386
387 static int dev_close(struct sr_dev_inst *sdi)
388 {
389         struct sr_usb_dev_inst *usb;
390
391         usb = sdi->conn;
392
393         if (!usb->devhdl)
394                 return SR_ERR_BUG;
395
396         sr_info("Closing device on %d.%d (logical) / %s (physical) interface %d.",
397                 usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
398         libusb_release_interface(usb->devhdl, USB_INTERFACE);
399         libusb_close(usb->devhdl);
400         usb->devhdl = NULL;
401
402         return SR_OK;
403 }
404
405 static int config_get(uint32_t key, GVariant **data,
406         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
407 {
408         struct dev_context *devc;
409         struct sr_usb_dev_inst *usb;
410         unsigned int i;
411
412         (void)cg;
413
414         switch (key) {
415         case SR_CONF_CONN:
416                 if (!sdi || !sdi->conn)
417                         return SR_ERR_ARG;
418                 usb = sdi->conn;
419                 if (usb->address == 255)
420                         /* Device still needs to re-enumerate after firmware
421                          * upload, so we don't know its (future) address. */
422                         return SR_ERR;
423                 *data = g_variant_new_printf("%d.%d", usb->bus, usb->address);
424                 break;
425         case SR_CONF_SAMPLERATE:
426                 if (!sdi)
427                         return SR_ERR;
428                 devc = sdi->priv;
429                 *data = g_variant_new_uint64(devc->cur_samplerate);
430                 break;
431         case SR_CONF_CAPTURE_RATIO:
432                 if (!sdi)
433                         return SR_ERR;
434                 devc = sdi->priv;
435                 *data = g_variant_new_uint64(devc->capture_ratio);
436                 break;
437         case SR_CONF_VOLTAGE_THRESHOLD:
438                 if (!sdi)
439                         return SR_ERR;
440                 devc = sdi->priv;
441                 for (i = 0; i < ARRAY_SIZE(thresholds); i++) {
442                         if (devc->selected_voltage_range != thresholds_ranges[i].range)
443                                 continue;
444                         *data = std_gvar_tuple_double(thresholds[i][0], thresholds[i][1]);
445                         return SR_OK;
446                 }
447                 return SR_ERR;
448         default:
449                 return SR_ERR_NA;
450         }
451
452         return SR_OK;
453 }
454
455 static int config_set(uint32_t key, GVariant *data,
456         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
457 {
458         struct dev_context *devc;
459         int idx;
460
461         (void)cg;
462
463         devc = sdi->priv;
464
465         switch (key) {
466         case SR_CONF_SAMPLERATE:
467                 devc->cur_samplerate = g_variant_get_uint64(data);
468                 break;
469         case SR_CONF_LIMIT_SAMPLES:
470                 devc->limit_samples = g_variant_get_uint64(data);
471                 break;
472         case SR_CONF_CAPTURE_RATIO:
473                 devc->capture_ratio = g_variant_get_uint64(data);
474                 break;
475         case SR_CONF_VOLTAGE_THRESHOLD:
476                 if ((idx = std_double_tuple_idx(data, ARRAY_AND_SIZE(thresholds))) < 0)
477                         return SR_ERR_ARG;
478                 devc->selected_voltage_range = thresholds_ranges[idx].range;
479                 break;
480         default:
481                 return SR_ERR_NA;
482         }
483
484         return SR_OK;
485 }
486
487 static int config_list(uint32_t key, GVariant **data,
488         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
489 {
490         switch (key) {
491         case SR_CONF_SCAN_OPTIONS:
492         case SR_CONF_DEVICE_OPTIONS:
493                 return STD_CONFIG_LIST(key, data, sdi, cg, scanopts, drvopts, devopts);
494         case SR_CONF_SAMPLERATE:
495                 *data = std_gvar_samplerates(ARRAY_AND_SIZE(samplerates));
496                 break;
497         case SR_CONF_VOLTAGE_THRESHOLD:
498                 *data = std_gvar_thresholds(ARRAY_AND_SIZE(thresholds));
499                 break;
500         case SR_CONF_TRIGGER_MATCH:
501                 *data = std_gvar_array_i32(ARRAY_AND_SIZE(trigger_matches));
502                 break;
503         default:
504                 return SR_ERR_NA;
505         }
506
507         return SR_OK;
508 }
509
510 static void abort_acquisition(struct dev_context *devc)
511 {
512         int i;
513
514         devc->sent_samples = -1;
515
516         for (i = devc->num_transfers - 1; i >= 0; i--) {
517                 if (devc->transfers[i])
518                         libusb_cancel_transfer(devc->transfers[i]);
519         }
520 }
521
522 static unsigned int bytes_per_ms(struct dev_context *devc)
523 {
524         return devc->cur_samplerate * devc->num_channels / 8000;
525 }
526
527 static size_t get_buffer_size(struct dev_context *devc)
528 {
529         size_t s;
530
531         /*
532          * The buffer should be large enough to hold 10ms of data and
533          * a multiple of 512.
534          */
535         s = 10 * bytes_per_ms(devc);
536         return (s + 511) & ~511;
537 }
538
539 static unsigned int get_number_of_transfers(struct dev_context *devc)
540 {
541         unsigned int n;
542
543         /* Total buffer size should be able to hold about 500ms of data. */
544         n = 500 * bytes_per_ms(devc) / get_buffer_size(devc);
545
546         if (n > NUM_SIMUL_TRANSFERS)
547                 return NUM_SIMUL_TRANSFERS;
548
549         return n;
550 }
551
552 static unsigned int get_timeout(struct dev_context *devc)
553 {
554         size_t total_size;
555         unsigned int timeout;
556
557         total_size = get_buffer_size(devc) * get_number_of_transfers(devc);
558         timeout = total_size / bytes_per_ms(devc);
559         return timeout + timeout / 4; /* Leave a headroom of 25% percent. */
560 }
561
562 static int configure_channels(const struct sr_dev_inst *sdi)
563 {
564         struct dev_context *devc;
565         struct sr_channel *ch;
566         GSList *l;
567         uint16_t channel_bit;
568
569         devc = sdi->priv;
570
571         devc->cur_channels = 0;
572         devc->num_channels = 0;
573         for (l = sdi->channels; l; l = l->next) {
574                 ch = (struct sr_channel *)l->data;
575                 if (ch->enabled == FALSE)
576                         continue;
577
578                 channel_bit = 1 << (ch->index);
579
580                 devc->cur_channels |= channel_bit;
581
582 #ifdef WORDS_BIGENDIAN
583                 /*
584                  * Output logic data should be stored in little endian format.
585                  * To speed things up during conversion, do the switcharoo
586                  * here instead.
587                  */
588                 channel_bit = 1 << (ch->index ^ 8);
589 #endif
590
591                 devc->channel_masks[devc->num_channels++] = channel_bit;
592         }
593
594         return SR_OK;
595 }
596
597 static int receive_data(int fd, int revents, void *cb_data)
598 {
599         struct timeval tv;
600         struct dev_context *devc;
601         struct drv_context *drvc;
602         const struct sr_dev_inst *sdi;
603         struct sr_dev_driver *di;
604
605         (void)fd;
606         (void)revents;
607
608         sdi = cb_data;
609         di = sdi->driver;
610         drvc = di->context;
611         devc = sdi->priv;
612
613         tv.tv_sec = tv.tv_usec = 0;
614         libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
615
616         if (devc->sent_samples == -2) {
617                 logic16_abort_acquisition(sdi);
618                 abort_acquisition(devc);
619         }
620
621         return TRUE;
622 }
623
624 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
625 {
626         struct sr_dev_driver *di = sdi->driver;
627         struct dev_context *devc;
628         struct drv_context *drvc;
629         struct sr_usb_dev_inst *usb;
630         struct sr_trigger *trigger;
631         struct libusb_transfer *transfer;
632         unsigned int i, timeout, num_transfers;
633         int ret;
634         unsigned char *buf;
635         size_t size, convsize;
636
637         drvc = di->context;
638         devc = sdi->priv;
639         usb = sdi->conn;
640
641         /* Configures devc->cur_channels. */
642         if (configure_channels(sdi) != SR_OK) {
643                 sr_err("Failed to configure channels.");
644                 return SR_ERR;
645         }
646
647         devc->sent_samples = 0;
648         devc->empty_transfer_count = 0;
649         devc->cur_channel = 0;
650         memset(devc->channel_data, 0, sizeof(devc->channel_data));
651
652         if ((trigger = sr_session_trigger_get(sdi->session))) {
653                 int pre_trigger_samples = 0;
654                 if (devc->limit_samples > 0)
655                         pre_trigger_samples = (devc->capture_ratio * devc->limit_samples) / 100;
656                 devc->stl = soft_trigger_logic_new(sdi, trigger, pre_trigger_samples);
657                 if (!devc->stl)
658                         return SR_ERR_MALLOC;
659                 devc->trigger_fired = FALSE;
660         } else
661                 devc->trigger_fired = TRUE;
662
663         timeout = get_timeout(devc);
664         num_transfers = get_number_of_transfers(devc);
665         size = get_buffer_size(devc);
666         convsize = (size / devc->num_channels + 2) * 16;
667         devc->submitted_transfers = 0;
668
669         devc->convbuffer_size = convsize;
670         if (!(devc->convbuffer = g_try_malloc(convsize))) {
671                 sr_err("Conversion buffer malloc failed.");
672                 return SR_ERR_MALLOC;
673         }
674
675         devc->transfers = g_try_malloc0(sizeof(*devc->transfers) * num_transfers);
676         if (!devc->transfers) {
677                 sr_err("USB transfers malloc failed.");
678                 g_free(devc->convbuffer);
679                 return SR_ERR_MALLOC;
680         }
681
682         if ((ret = logic16_setup_acquisition(sdi, devc->cur_samplerate,
683                                              devc->cur_channels)) != SR_OK) {
684                 g_free(devc->transfers);
685                 g_free(devc->convbuffer);
686                 return ret;
687         }
688
689         devc->num_transfers = num_transfers;
690         for (i = 0; i < num_transfers; i++) {
691                 if (!(buf = g_try_malloc(size))) {
692                         sr_err("USB transfer buffer malloc failed.");
693                         if (devc->submitted_transfers)
694                                 abort_acquisition(devc);
695                         else {
696                                 g_free(devc->transfers);
697                                 g_free(devc->convbuffer);
698                         }
699                         return SR_ERR_MALLOC;
700                 }
701                 transfer = libusb_alloc_transfer(0);
702                 libusb_fill_bulk_transfer(transfer, usb->devhdl,
703                                 2 | LIBUSB_ENDPOINT_IN, buf, size,
704                                 logic16_receive_transfer, (void *)sdi, timeout);
705                 if ((ret = libusb_submit_transfer(transfer)) != 0) {
706                         sr_err("Failed to submit transfer: %s.",
707                                libusb_error_name(ret));
708                         libusb_free_transfer(transfer);
709                         g_free(buf);
710                         abort_acquisition(devc);
711                         return SR_ERR;
712                 }
713                 devc->transfers[i] = transfer;
714                 devc->submitted_transfers++;
715         }
716
717         devc->ctx = drvc->sr_ctx;
718
719         usb_source_add(sdi->session, devc->ctx, timeout, receive_data, (void *)sdi);
720
721         std_session_send_df_header(sdi);
722
723         if ((ret = logic16_start_acquisition(sdi)) != SR_OK) {
724                 abort_acquisition(devc);
725                 return ret;
726         }
727
728         return SR_OK;
729 }
730
731 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
732 {
733         int ret;
734
735         ret = logic16_abort_acquisition(sdi);
736
737         abort_acquisition(sdi->priv);
738
739         return ret;
740 }
741
742 static struct sr_dev_driver saleae_logic16_driver_info = {
743         .name = "saleae-logic16",
744         .longname = "Saleae Logic16",
745         .api_version = 1,
746         .init = std_init,
747         .cleanup = std_cleanup,
748         .scan = scan,
749         .dev_list = std_dev_list,
750         .dev_clear = std_dev_clear,
751         .config_get = config_get,
752         .config_set = config_set,
753         .config_list = config_list,
754         .dev_open = dev_open,
755         .dev_close = dev_close,
756         .dev_acquisition_start = dev_acquisition_start,
757         .dev_acquisition_stop = dev_acquisition_stop,
758         .context = NULL,
759 };
760 SR_REGISTER_DEV_DRIVER(saleae_logic16_driver_info);