kingst-la2016: Eliminate non-portable packed structs for USB transfer layout
[libsigrok.git] / src / hardware / kingst-la2016 / api.c
1 /*
2  * This file is part of the libsigrok project.
3  *
4  * Copyright (C) 2020 Florian Schmidt <schmidt_florian@gmx.de>
5  * Copyright (C) 2013 Marcus Comstedt <marcus@mc.pp.se>
6  * Copyright (C) 2013 Bert Vermeulen <bert@biot.com>
7  * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
8  *
9  * This program is free software: you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation, either version 3 of the License, or
12  * (at your option) any later version.
13  *
14  * This program is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17  * GNU General Public License for more details.
18  *
19  * You should have received a copy of the GNU General Public License
20  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
21  */
22
23 /* mostly stolen from src/hardware/saleae-logic16/ */
24
25 #include <config.h>
26 #include <glib.h>
27 #include <libusb.h>
28 #include <stdlib.h>
29 #include <string.h>
30 #include <math.h>
31 #include <libsigrok/libsigrok.h>
32 #include "libsigrok-internal.h"
33 #include "protocol.h"
34
35 static const uint32_t scanopts[] = {
36         SR_CONF_CONN,
37 };
38
39 static const uint32_t drvopts[] = {
40         SR_CONF_LOGIC_ANALYZER,
41 };
42
43 static const uint32_t devopts[] = {
44         /* TODO: SR_CONF_CONTINUOUS, */
45         SR_CONF_CONN | SR_CONF_GET,
46         SR_CONF_SAMPLERATE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
47         SR_CONF_LIMIT_SAMPLES | SR_CONF_SET | SR_CONF_GET | SR_CONF_LIST,
48         SR_CONF_VOLTAGE_THRESHOLD | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
49         SR_CONF_LOGIC_THRESHOLD | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
50         SR_CONF_LOGIC_THRESHOLD_CUSTOM | SR_CONF_GET | SR_CONF_SET,
51         SR_CONF_TRIGGER_MATCH | SR_CONF_LIST,
52         SR_CONF_CAPTURE_RATIO | SR_CONF_GET | SR_CONF_SET,
53 };
54
55 static const int32_t trigger_matches[] = {
56         SR_TRIGGER_ZERO,
57         SR_TRIGGER_ONE,
58         SR_TRIGGER_RISING,
59         SR_TRIGGER_FALLING,
60 };
61
62 static const char *channel_names[] = {
63         "0", "1", "2", "3", "4", "5", "6", "7", "8",
64         "9", "10", "11", "12", "13", "14", "15",
65 };
66
67 static const uint64_t samplerates[] = {
68         SR_KHZ(20),
69         SR_KHZ(50),
70         SR_KHZ(100),
71         SR_KHZ(200),
72         SR_KHZ(500),
73         SR_MHZ(1),
74         SR_MHZ(2),
75         SR_MHZ(4),
76         SR_MHZ(5),
77         SR_MHZ(8),
78         SR_MHZ(10),
79         SR_MHZ(20),
80         SR_MHZ(50),
81         SR_MHZ(100),
82         SR_MHZ(200),
83 };
84
85 static const float logic_threshold_value[] = {
86         1.58,
87         2.5,
88         1.165,
89         1.5,
90         1.25,
91         0.9,
92         0.75,
93         0.60,
94         0.45,
95 };
96
97 static const char *logic_threshold[] = {
98         "TTL 5V",
99         "CMOS 5V",
100         "CMOS 3.3V",
101         "CMOS 3.0V",
102         "CMOS 2.5V",
103         "CMOS 1.8V",
104         "CMOS 1.5V",
105         "CMOS 1.2V",
106         "CMOS 0.9V",
107         "USER",
108 };
109
110 #define MAX_NUM_LOGIC_THRESHOLD_ENTRIES ARRAY_SIZE(logic_threshold)
111
112 static GSList *scan(struct sr_dev_driver *di, GSList *options)
113 {
114         struct drv_context *drvc;
115         struct dev_context *devc;
116         struct sr_dev_inst *sdi;
117         struct sr_usb_dev_inst *usb;
118         struct sr_config *src;
119         GSList *l;
120         GSList *devices;
121         GSList *conn_devices;
122         struct libusb_device_descriptor des;
123         libusb_device **devlist;
124         unsigned int i, j;
125         const char *conn;
126         char connection_id[64];
127         int64_t fw_updated;
128         unsigned int dev_addr;
129
130         drvc = di->context;
131
132         conn = NULL;
133         for (l = options; l; l = l->next) {
134                 src = l->data;
135                 switch (src->key) {
136                 case SR_CONF_CONN:
137                         conn = g_variant_get_string(src->data, NULL);
138                         break;
139                 }
140         }
141         if (conn)
142                 conn_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn);
143         else
144                 conn_devices = NULL;
145
146         /* Find all LA2016 devices and upload firmware to them. */
147         devices = NULL;
148         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
149         for (i = 0; devlist[i]; i++) {
150                 if (conn) {
151                         usb = NULL;
152                         for (l = conn_devices; l; l = l->next) {
153                                 usb = l->data;
154                                 if (usb->bus == libusb_get_bus_number(devlist[i])
155                                     && usb->address == libusb_get_device_address(devlist[i]))
156                                         break;
157                         }
158                         if (!l)
159                                 /* This device matched none of the ones that
160                                  * matched the conn specification. */
161                                 continue;
162                 }
163
164                 libusb_get_device_descriptor(devlist[i], &des);
165
166                 if (usb_get_port_path(devlist[i], connection_id, sizeof(connection_id)) < 0)
167                         continue;
168
169                 if (des.idVendor != LA2016_VID || des.idProduct != LA2016_PID)
170                         continue;
171
172                 /* Already has the firmware */
173                 sr_dbg("Found a LA2016 device.");
174                 sdi = g_malloc0(sizeof(struct sr_dev_inst));
175                 sdi->status = SR_ST_INITIALIZING;
176                 sdi->connection_id = g_strdup(connection_id);
177
178                 fw_updated = 0;
179                 dev_addr = libusb_get_device_address(devlist[i]);
180                 if (des.iProduct != 2) {
181                         sr_info("device at '%s' has no firmware loaded!", connection_id);
182
183                         if (la2016_upload_firmware(drvc->sr_ctx, devlist[i], des.idProduct) != SR_OK) {
184                                 sr_err("uC firmware upload failed!");
185                                 g_free(sdi->connection_id);
186                                 g_free(sdi);
187                                 continue;
188                         }
189                         fw_updated = g_get_monotonic_time();
190                         dev_addr = 0xff; /* to mark that we don't know address yet... ugly */
191                 }
192
193                 sdi->vendor = g_strdup("Kingst");
194                 sdi->model = g_strdup("LA2016");
195
196                 for (j = 0; j < ARRAY_SIZE(channel_names); j++)
197                         sr_channel_new(sdi, j, SR_CHANNEL_LOGIC, TRUE, channel_names[j]);
198
199                 devices = g_slist_append(devices, sdi);
200
201                 devc = g_malloc0(sizeof(struct dev_context));
202                 sdi->priv = devc;
203                 devc->fw_updated = fw_updated;
204                 devc->threshold_voltage_idx = 0;
205                 devc->threshold_voltage = logic_threshold_value[devc->threshold_voltage_idx];
206
207                 sdi->status = SR_ST_INACTIVE;
208                 sdi->inst_type = SR_INST_USB;
209
210                 sdi->conn = sr_usb_dev_inst_new(
211                         libusb_get_bus_number(devlist[i]),
212                         dev_addr, NULL);
213         }
214         libusb_free_device_list(devlist, 1);
215         g_slist_free_full(conn_devices, (GDestroyNotify)sr_usb_dev_inst_free);
216
217         return std_scan_complete(di, devices);
218 }
219
220 static int la2016_dev_open(struct sr_dev_inst *sdi)
221 {
222         struct sr_dev_driver *di;
223         libusb_device **devlist;
224         struct sr_usb_dev_inst *usb;
225         struct libusb_device_descriptor des;
226         struct drv_context *drvc;
227         int ret, i, device_count;
228         char connection_id[64];
229
230         di = sdi->driver;
231         drvc = di->context;
232         usb = sdi->conn;
233         ret = SR_ERR;
234
235         device_count = libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
236         if (device_count < 0) {
237                 sr_err("Failed to get device list: %s.", libusb_error_name(device_count));
238                 return SR_ERR;
239         }
240
241         for (i = 0; i < device_count; i++) {
242                 libusb_get_device_descriptor(devlist[i], &des);
243
244                 if (des.idVendor != LA2016_VID || des.idProduct != LA2016_PID || des.iProduct != 2)
245                         continue;
246
247                 if ((sdi->status == SR_ST_INITIALIZING) || (sdi->status == SR_ST_INACTIVE)) {
248                         /*
249                          * Check device by its physical USB bus/port address.
250                          */
251                         if (usb_get_port_path(devlist[i], connection_id, sizeof(connection_id)) < 0)
252                                 continue;
253
254                         if (strcmp(sdi->connection_id, connection_id))
255                                 /* This is not the one. */
256                                 continue;
257                 }
258
259                 if (!(ret = libusb_open(devlist[i], &usb->devhdl))) {
260                         if (usb->address == 0xff)
261                                 /*
262                                  * First time we touch this device after FW
263                                  * upload, so we don't know the address yet.
264                                  */
265                                 usb->address = libusb_get_device_address(devlist[i]);
266                 } else {
267                         sr_err("Failed to open device: %s.", libusb_error_name(ret));
268                         ret = SR_ERR;
269                         break;
270                 }
271
272                 ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
273                 if (ret == LIBUSB_ERROR_BUSY) {
274                         sr_err("Unable to claim USB interface. Another "
275                                "program or driver has already claimed it.");
276                         ret = SR_ERR;
277                         break;
278                 } else if (ret == LIBUSB_ERROR_NO_DEVICE) {
279                         sr_err("Device has been disconnected.");
280                         ret = SR_ERR;
281                         break;
282                 } else if (ret != 0) {
283                         sr_err("Unable to claim interface: %s.", libusb_error_name(ret));
284                         ret = SR_ERR;
285                         break;
286                 }
287
288                 if ((ret = la2016_init_device(sdi)) != SR_OK) {
289                         sr_err("Failed to init device.");
290                         break;
291                 }
292
293                 sr_info("Opened device on %d.%d (logical) / %s (physical), interface %d.",
294                         usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
295
296                 ret = SR_OK;
297
298                 break;
299         }
300
301         libusb_free_device_list(devlist, 1);
302
303         if (ret != SR_OK) {
304                 if (usb->devhdl) {
305                         libusb_release_interface(usb->devhdl, USB_INTERFACE);
306                         libusb_close(usb->devhdl);
307                         usb->devhdl = NULL;
308                 }
309                 return SR_ERR;
310         }
311
312         return SR_OK;
313 }
314
315 static int dev_open(struct sr_dev_inst *sdi)
316 {
317         struct dev_context *devc;
318         int64_t timediff_us, timediff_ms;
319         uint64_t reset_done;
320         uint64_t now;
321         int ret;
322
323         devc = sdi->priv;
324
325         /*
326          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
327          * milliseconds for the FX2 to renumerate.
328          */
329         ret = SR_ERR;
330         if (devc->fw_updated > 0) {
331                 sr_info("Waiting for device to reset after firmware upload.");
332                 /* Takes >= 2000ms for the uC to be gone from the USB bus. */
333                 reset_done = devc->fw_updated + 18 * (uint64_t)1e5; /* 1.8 seconds */
334                 now = g_get_monotonic_time();
335                 if (reset_done > now)
336                         g_usleep(reset_done - now);
337                 timediff_ms = 0;
338                 while (timediff_ms < MAX_RENUM_DELAY_MS) {
339                         g_usleep(200 * 1000);
340
341                         timediff_us = g_get_monotonic_time() - devc->fw_updated;
342                         timediff_ms = timediff_us / 1000;
343                         
344                         if ((ret = la2016_dev_open(sdi)) == SR_OK)
345                                 break;
346                         sr_spew("Waited %" PRIi64 "ms.", timediff_ms);
347                 }
348                 if (ret != SR_OK) {
349                         sr_err("Device failed to re-enumerate.");
350                         return SR_ERR;
351                 }
352                 sr_info("Device came back after %" PRIi64 "ms.", timediff_ms);
353         } else
354                 ret = la2016_dev_open(sdi);
355
356         if (ret != SR_OK) {
357                 sr_err("Unable to open device.");
358                 return SR_ERR;
359         }
360
361         return SR_OK;
362 }
363
364 static int dev_close(struct sr_dev_inst *sdi)
365 {
366         struct sr_usb_dev_inst *usb;
367
368         usb = sdi->conn;
369
370         if (!usb->devhdl)
371                 return SR_ERR_BUG;
372
373         la2016_deinit_device(sdi);
374
375         sr_info("Closing device on %d.%d (logical) / %s (physical) interface %d.",
376                 usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
377         libusb_release_interface(usb->devhdl, USB_INTERFACE);
378         libusb_close(usb->devhdl);
379         usb->devhdl = NULL;
380
381         return SR_OK;
382 }
383
384 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
385 {
386         struct dev_context *devc;
387         struct sr_usb_dev_inst *usb;
388         double rounded;
389
390         (void)cg;
391
392         if (!sdi)
393                 return SR_ERR_ARG;
394         devc = sdi->priv;
395
396         switch (key) {
397         case SR_CONF_CONN:
398                 if (!sdi->conn)
399                         return SR_ERR_ARG;
400                 usb = sdi->conn;
401                 if (usb->address == 255)
402                         /* Device still needs to re-enumerate after firmware
403                          * upload, so we don't know its (future) address. */
404                         return SR_ERR;
405                 *data = g_variant_new_printf("%d.%d", usb->bus, usb->address);
406                 break;
407         case SR_CONF_SAMPLERATE:
408                 *data = g_variant_new_uint64(devc->cur_samplerate);
409                 break;
410         case SR_CONF_LIMIT_SAMPLES:
411                 *data = g_variant_new_uint64(devc->limit_samples);
412                 break;
413         case SR_CONF_CAPTURE_RATIO:
414                 *data = g_variant_new_uint64(devc->capture_ratio);
415                 break;
416         case SR_CONF_VOLTAGE_THRESHOLD:
417                 rounded = (int)(devc->threshold_voltage / 0.1) * 0.1;
418                 *data = std_gvar_tuple_double(rounded, rounded + 0.1);
419                 return SR_OK;
420         case SR_CONF_LOGIC_THRESHOLD:
421                 *data = g_variant_new_string(logic_threshold[devc->threshold_voltage_idx]);
422                 break;
423         case SR_CONF_LOGIC_THRESHOLD_CUSTOM:
424                 *data = g_variant_new_double(devc->threshold_voltage);
425                 break;
426                 
427         default:
428                 return SR_ERR_NA;
429         }
430
431         return SR_OK;
432 }
433
434 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
435 {
436         struct dev_context *devc;
437         double low, high;
438         int idx;
439
440         (void)cg;
441
442         devc = sdi->priv;
443
444         switch (key) {
445         case SR_CONF_SAMPLERATE:
446                 devc->cur_samplerate = g_variant_get_uint64(data);
447                 break;
448         case SR_CONF_LIMIT_SAMPLES:
449                 devc->limit_samples = g_variant_get_uint64(data);
450                 break;
451         case SR_CONF_CAPTURE_RATIO:
452                 devc->capture_ratio = g_variant_get_uint64(data);
453                 break;
454         case SR_CONF_VOLTAGE_THRESHOLD:
455                 g_variant_get(data, "(dd)", &low, &high);
456                 devc->threshold_voltage = (low + high) / 2.0;
457                 devc->threshold_voltage_idx = MAX_NUM_LOGIC_THRESHOLD_ENTRIES - 1; /* USER */
458                 break;
459         case SR_CONF_LOGIC_THRESHOLD: {
460                 if ((idx = std_str_idx(data, logic_threshold, MAX_NUM_LOGIC_THRESHOLD_ENTRIES)) < 0)
461                         return SR_ERR_ARG;
462                 if (idx == MAX_NUM_LOGIC_THRESHOLD_ENTRIES - 1) {
463                         /* user threshold */
464                 } else {
465                         devc->threshold_voltage = logic_threshold_value[idx];
466                 }
467                 devc->threshold_voltage_idx = idx;
468                 break;
469         }
470         case SR_CONF_LOGIC_THRESHOLD_CUSTOM:
471                 devc->threshold_voltage = g_variant_get_double(data);
472                 break;
473         default:
474                 return SR_ERR_NA;
475         }
476
477         return SR_OK;
478 }
479
480 static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
481 {
482         switch (key) {
483         case SR_CONF_SCAN_OPTIONS:
484         case SR_CONF_DEVICE_OPTIONS:
485                 return STD_CONFIG_LIST(key, data, sdi, cg, scanopts, drvopts, devopts);
486         case SR_CONF_SAMPLERATE:
487                 *data = std_gvar_samplerates(ARRAY_AND_SIZE(samplerates));
488                 break;
489         case SR_CONF_LIMIT_SAMPLES:
490                 *data = std_gvar_tuple_u64(LA2016_NUM_SAMPLES_MIN, LA2016_NUM_SAMPLES_MAX);
491                 break;
492         case SR_CONF_VOLTAGE_THRESHOLD:
493                 *data = std_gvar_min_max_step_thresholds(
494                         LA2016_THR_VOLTAGE_MIN,
495                         LA2016_THR_VOLTAGE_MAX, 0.1);
496                 break;
497         case SR_CONF_TRIGGER_MATCH:
498                 *data = std_gvar_array_i32(ARRAY_AND_SIZE(trigger_matches));
499                 break;
500         case SR_CONF_LOGIC_THRESHOLD:
501                 *data = g_variant_new_strv(logic_threshold, MAX_NUM_LOGIC_THRESHOLD_ENTRIES);
502                 break;
503         default:
504                 return SR_ERR_NA;
505         }
506
507         return SR_OK;
508 }
509
510 static void send_chunk(struct sr_dev_inst *sdi, const uint8_t *packets, unsigned int num_tfers)
511 {
512         struct dev_context *devc;
513         struct sr_datafeed_logic logic;
514         struct sr_datafeed_packet sr_packet;
515         unsigned int max_samples, n_samples, total_samples, free_n_samples;
516         unsigned int i, j, k;
517         int do_signal_trigger;
518         uint16_t *wp;
519         const uint8_t *rp;
520         uint16_t state;
521         uint8_t repetitions;
522
523         devc = sdi->priv;
524
525         logic.unitsize = 2;
526         logic.data = devc->convbuffer;
527
528         sr_packet.type = SR_DF_LOGIC;
529         sr_packet.payload = &logic;
530
531         max_samples = devc->convbuffer_size / 2;
532         n_samples = 0;
533         wp = (uint16_t*)devc->convbuffer;
534         total_samples = 0;
535         do_signal_trigger = 0;
536
537         if (devc->had_triggers_configured && devc->reading_behind_trigger == 0 && devc->info.n_rep_packets_before_trigger == 0) {
538                 std_session_send_df_trigger(sdi);
539                 devc->reading_behind_trigger = 1;
540         }
541
542         rp = packets;
543         for (i = 0; i < num_tfers; i++) {
544                 for (k = 0; k < NUM_PACKETS_IN_CHUNK; k++) {
545                         free_n_samples = max_samples - n_samples;
546                         if (free_n_samples < 256 || do_signal_trigger) {
547                                 logic.length = n_samples * 2;
548                                 sr_session_send(sdi, &sr_packet);
549                                 n_samples = 0;
550                                 wp = (uint16_t*)devc->convbuffer;
551                                 if (do_signal_trigger) {
552                                         std_session_send_df_trigger(sdi);
553                                         do_signal_trigger = 0;
554                                 }
555                         }
556
557                         state = read_u16le_inc(&rp);
558                         repetitions = read_u8_inc(&rp);
559                         for (j = 0; j < repetitions; j++)
560                                 *(wp++) = state;
561
562                         n_samples += repetitions;
563                         total_samples += repetitions;
564                         devc->total_samples += repetitions;
565                         if (!devc->reading_behind_trigger) {
566                                 devc->n_reps_until_trigger --;
567                                 if (devc->n_reps_until_trigger == 0) {
568                                         devc->reading_behind_trigger = 1;
569                                         do_signal_trigger = 1;
570                                         sr_dbg("  here is trigger position after %" PRIu64 " samples, %.6fms",
571                                                devc->total_samples,
572                                                (double)devc->total_samples / devc->cur_samplerate * 1e3);
573                                 }
574                         }
575                 }
576                 (void)read_u8_inc(&rp); /* Skip sequence number. */
577         }
578         if (n_samples) {
579                 logic.length = n_samples * 2;
580                 sr_session_send(sdi, &sr_packet);
581                 if (do_signal_trigger) {
582                         std_session_send_df_trigger(sdi);
583                 }
584         }
585         sr_dbg("send_chunk done after %d samples", total_samples);
586 }
587
588 static void LIBUSB_CALL receive_transfer(struct libusb_transfer *transfer)
589 {
590         struct sr_dev_inst *sdi;
591         struct dev_context *devc;
592         struct sr_usb_dev_inst *usb;
593         int ret;
594
595         sdi = transfer->user_data;
596         devc = sdi->priv;
597         usb = sdi->conn;
598
599         sr_dbg("receive_transfer(): status %s received %d bytes.",
600                libusb_error_name(transfer->status), transfer->actual_length);
601
602         if (transfer->status == LIBUSB_TRANSFER_TIMED_OUT) {
603                 sr_err("bulk transfer timeout!");
604                 devc->transfer_finished = 1;
605         }
606         send_chunk(sdi, transfer->buffer, transfer->actual_length / TRANSFER_PACKET_LENGTH);
607
608         devc->n_bytes_to_read -= transfer->actual_length;
609         if (devc->n_bytes_to_read) {
610                 uint32_t to_read = devc->n_bytes_to_read;
611                 if (to_read > LA2016_BULK_MAX)
612                         to_read = LA2016_BULK_MAX;
613                 libusb_fill_bulk_transfer(
614                         transfer, usb->devhdl,
615                         0x86, transfer->buffer, to_read,
616                         receive_transfer, (void*)sdi, DEFAULT_TIMEOUT_MS);
617
618                 if ((ret = libusb_submit_transfer(transfer)) == 0)
619                         return;
620                 sr_err("Failed to submit further transfer: %s.", libusb_error_name(ret));
621         }
622
623         g_free(transfer->buffer);
624         libusb_free_transfer(transfer);
625         devc->transfer_finished = 1;
626 }
627
628 static int handle_event(int fd, int revents, void *cb_data)
629 {
630         const struct sr_dev_inst *sdi;
631         struct dev_context *devc;
632         struct drv_context *drvc;
633         struct timeval tv;
634
635         (void)fd;
636         (void)revents;
637
638         sdi = cb_data;
639         devc = sdi->priv;
640         drvc = sdi->driver->context;
641
642         if (devc->have_trigger == 0) {
643                 if (la2016_has_triggered(sdi) == 0) {
644                         sr_dbg("not yet ready for download...");
645                         return TRUE;
646                 }
647                 devc->have_trigger = 1;
648                 devc->transfer_finished = 0;
649                 devc->reading_behind_trigger = 0;
650                 devc->total_samples = 0;
651                 /* we can start retrieving data! */
652                 if (la2016_start_retrieval(sdi, receive_transfer) != SR_OK) {
653                         sr_err("failed to start retrieval!");
654                         return FALSE;
655                 }
656                 sr_dbg("retrieval is started...");
657                 std_session_send_df_frame_begin(sdi);
658
659                 return TRUE;
660         }
661
662         tv.tv_sec = tv.tv_usec = 0;
663         libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
664
665         if (devc->transfer_finished) {
666                 sr_dbg("transfer is finished!");
667                 std_session_send_df_frame_end(sdi);
668
669                 usb_source_remove(sdi->session, drvc->sr_ctx);
670                 std_session_send_df_end(sdi);
671
672                 la2016_stop_acquisition(sdi);
673
674                 g_free(devc->convbuffer);
675                 devc->convbuffer = NULL;
676
677                 sr_dbg("transfer is now finished");
678         }
679
680         return TRUE;
681 }
682
683 static void abort_acquisition(struct dev_context *devc)
684 {
685         if (devc->transfer)
686                 libusb_cancel_transfer(devc->transfer);
687 }
688
689 static int configure_channels(const struct sr_dev_inst *sdi)
690 {
691         struct dev_context *devc;
692
693         devc = sdi->priv;
694         devc->cur_channels = 0;
695         devc->num_channels = 0;
696
697         for (GSList *l = sdi->channels; l; l = l->next) {
698                 struct sr_channel *ch = (struct sr_channel*)l->data;
699                 if (ch->enabled == FALSE)
700                         continue;
701                 devc->cur_channels |= 1 << (ch->index);
702                 devc->num_channels++;
703         }
704
705         return SR_OK;
706 }
707
708 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
709 {
710         struct sr_dev_driver *di;
711         struct drv_context *drvc;
712         struct dev_context *devc;
713         int ret;
714
715         di = sdi->driver;
716         drvc = di->context;
717         devc = sdi->priv;
718
719         if (configure_channels(sdi) != SR_OK) {
720                 sr_err("Failed to configure channels.");
721                 return SR_ERR;
722         }
723
724         devc->convbuffer_size = 4 * 1024 * 1024;
725         if (!(devc->convbuffer = g_try_malloc(devc->convbuffer_size))) {
726                 sr_err("Conversion buffer malloc failed.");
727                 return SR_ERR_MALLOC;
728         }
729
730         if ((ret = la2016_setup_acquisition(sdi)) != SR_OK) {
731                 g_free(devc->convbuffer);
732                 devc->convbuffer = NULL;
733                 return ret;
734         }
735
736         devc->ctx = drvc->sr_ctx;
737
738         if ((ret = la2016_start_acquisition(sdi)) != SR_OK) {
739                 abort_acquisition(devc);
740                 return ret;
741         }
742
743         devc->have_trigger = 0;
744         usb_source_add(sdi->session, drvc->sr_ctx, 50, handle_event, (void*)sdi);
745
746         std_session_send_df_header(sdi);
747
748         return SR_OK;
749 }
750
751 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
752 {
753         int ret;
754
755         ret = la2016_abort_acquisition(sdi);
756         abort_acquisition(sdi->priv);
757
758         return ret;
759 }
760
761 static struct sr_dev_driver kingst_la2016_driver_info = {
762         .name = "kingst-la2016",
763         .longname = "Kingst LA2016",
764         .api_version = 1,
765         .init = std_init,
766         .cleanup = std_cleanup,
767         .scan = scan,
768         .dev_list = std_dev_list,
769         .dev_clear = std_dev_clear,
770         .config_get = config_get,
771         .config_set = config_set,
772         .config_list = config_list,
773         .dev_open = dev_open,
774         .dev_close = dev_close,
775         .dev_acquisition_start = dev_acquisition_start,
776         .dev_acquisition_stop = dev_acquisition_stop,
777         .context = NULL,
778 };
779 SR_REGISTER_DEV_DRIVER(kingst_la2016_driver_info);