rdtech-dps: Use big endian register access for DPS devices
[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",
64         "8", "9", "10", "11", "12", "13", "14", "15",
65 };
66
67 static const uint64_t samplerates_la2016[] = {
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 uint64_t samplerates_la1016[] = {
86         SR_KHZ(20),
87         SR_KHZ(50),
88         SR_KHZ(100),
89         SR_KHZ(200),
90         SR_KHZ(500),
91         SR_MHZ(1),
92         SR_MHZ(2),
93         SR_MHZ(4),
94         SR_MHZ(5),
95         SR_MHZ(8),
96         SR_MHZ(10),
97         SR_MHZ(20),
98         SR_MHZ(50),
99         SR_MHZ(100),
100 };
101
102 static const float logic_threshold_value[] = {
103         1.58,
104         2.5,
105         1.165,
106         1.5,
107         1.25,
108         0.9,
109         0.75,
110         0.60,
111         0.45,
112 };
113
114 static const char *logic_threshold[] = {
115         "TTL 5V",
116         "CMOS 5V",
117         "CMOS 3.3V",
118         "CMOS 3.0V",
119         "CMOS 2.5V",
120         "CMOS 1.8V",
121         "CMOS 1.5V",
122         "CMOS 1.2V",
123         "CMOS 0.9V",
124         "USER",
125 };
126
127 #define MAX_NUM_LOGIC_THRESHOLD_ENTRIES ARRAY_SIZE(logic_threshold)
128
129 static GSList *scan(struct sr_dev_driver *di, GSList *options)
130 {
131         struct drv_context *drvc;
132         struct dev_context *devc;
133         struct sr_dev_inst *sdi;
134         struct sr_usb_dev_inst *usb;
135         struct sr_config *src;
136         GSList *l;
137         GSList *devices;
138         GSList *conn_devices;
139         struct libusb_device_descriptor des;
140         libusb_device **devlist;
141         unsigned int i, j;
142         const char *conn;
143         char connection_id[64];
144         int64_t fw_updated;
145         unsigned int dev_addr;
146
147         drvc = di->context;
148
149         conn = NULL;
150         for (l = options; l; l = l->next) {
151                 src = l->data;
152                 switch (src->key) {
153                 case SR_CONF_CONN:
154                         conn = g_variant_get_string(src->data, NULL);
155                         break;
156                 }
157         }
158         if (conn)
159                 conn_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn);
160         else
161                 conn_devices = NULL;
162
163         /* Find all LA2016 devices and upload firmware to them. */
164         devices = NULL;
165         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
166         for (i = 0; devlist[i]; i++) {
167                 if (conn) {
168                         usb = NULL;
169                         for (l = conn_devices; l; l = l->next) {
170                                 usb = l->data;
171                                 if (usb->bus == libusb_get_bus_number(devlist[i]) &&
172                                     usb->address == libusb_get_device_address(devlist[i]))
173                                         break;
174                         }
175                         if (!l) {
176                                 /* This device matched none of the ones that
177                                  * matched the conn specification. */
178                                 continue;
179                         }
180                 }
181
182                 libusb_get_device_descriptor(devlist[i], &des);
183
184                 if (usb_get_port_path(devlist[i], connection_id, sizeof(connection_id)) < 0)
185                         continue;
186
187                 if (des.idVendor != LA2016_VID || des.idProduct != LA2016_PID)
188                         continue;
189
190                 /* Already has the firmware */
191                 sr_dbg("Found a LA2016 device.");
192                 sdi = g_malloc0(sizeof(struct sr_dev_inst));
193                 sdi->status = SR_ST_INITIALIZING;
194                 sdi->connection_id = g_strdup(connection_id);
195
196                 fw_updated = 0;
197                 dev_addr = libusb_get_device_address(devlist[i]);
198                 if (des.iProduct != 2) {
199                         sr_info("device at '%s' has no firmware loaded!", connection_id);
200
201                         if (la2016_upload_firmware(drvc->sr_ctx, devlist[i], des.idProduct) != SR_OK) {
202                                 sr_err("uC firmware upload failed!");
203                                 g_free(sdi->connection_id);
204                                 g_free(sdi);
205                                 continue;
206                         }
207                         fw_updated = g_get_monotonic_time();
208                         dev_addr = 0xff; /* to mark that we don't know address yet... ugly */
209                 }
210
211                 sdi->vendor = g_strdup("Kingst");
212                 sdi->model = g_strdup("LA2016");
213
214                 for (j = 0; j < ARRAY_SIZE(channel_names); j++)
215                         sr_channel_new(sdi, j, SR_CHANNEL_LOGIC, TRUE, channel_names[j]);
216
217                 devices = g_slist_append(devices, sdi);
218
219                 devc = g_malloc0(sizeof(struct dev_context));
220                 sdi->priv = devc;
221                 devc->fw_updated = fw_updated;
222                 devc->threshold_voltage_idx = 0;
223                 devc->threshold_voltage = logic_threshold_value[devc->threshold_voltage_idx];
224
225                 sdi->status = SR_ST_INACTIVE;
226                 sdi->inst_type = SR_INST_USB;
227
228                 sdi->conn = sr_usb_dev_inst_new(
229                         libusb_get_bus_number(devlist[i]),
230                         dev_addr, NULL);
231         }
232         libusb_free_device_list(devlist, 1);
233         g_slist_free_full(conn_devices, (GDestroyNotify)sr_usb_dev_inst_free);
234
235         return std_scan_complete(di, devices);
236 }
237
238 static int la2016_dev_open(struct sr_dev_inst *sdi)
239 {
240         struct sr_dev_driver *di;
241         libusb_device **devlist;
242         struct sr_usb_dev_inst *usb;
243         struct libusb_device_descriptor des;
244         struct drv_context *drvc;
245         int ret, i, device_count;
246         char connection_id[64];
247
248         di = sdi->driver;
249         drvc = di->context;
250         usb = sdi->conn;
251         ret = SR_ERR;
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.", libusb_error_name(device_count));
256                 return SR_ERR;
257         }
258
259         for (i = 0; i < device_count; i++) {
260                 libusb_get_device_descriptor(devlist[i], &des);
261
262                 if (des.idVendor != LA2016_VID || des.idProduct != LA2016_PID || des.iProduct != 2)
263                         continue;
264
265                 if ((sdi->status == SR_ST_INITIALIZING) || (sdi->status == SR_ST_INACTIVE)) {
266                         /*
267                          * Check device by its physical USB bus/port address.
268                          */
269                         if (usb_get_port_path(devlist[i], connection_id, sizeof(connection_id)) < 0)
270                                 continue;
271
272                         if (strcmp(sdi->connection_id, connection_id))
273                                 /* This is not the one. */
274                                 continue;
275                 }
276
277                 if (!(ret = libusb_open(devlist[i], &usb->devhdl))) {
278                         if (usb->address == 0xff)
279                                 /*
280                                  * First time we touch this device after FW
281                                  * upload, so we don't know the address yet.
282                                  */
283                                 usb->address = libusb_get_device_address(devlist[i]);
284                 } else {
285                         sr_err("Failed to open device: %s.", libusb_error_name(ret));
286                         ret = SR_ERR;
287                         break;
288                 }
289
290                 ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
291                 if (ret == LIBUSB_ERROR_BUSY) {
292                         sr_err("Unable to claim USB interface. Another "
293                                "program or driver has already claimed it.");
294                         ret = SR_ERR;
295                         break;
296                 } else if (ret == LIBUSB_ERROR_NO_DEVICE) {
297                         sr_err("Device has been disconnected.");
298                         ret = SR_ERR;
299                         break;
300                 } else if (ret != 0) {
301                         sr_err("Unable to claim interface: %s.", libusb_error_name(ret));
302                         ret = SR_ERR;
303                         break;
304                 }
305
306                 if ((ret = la2016_init_device(sdi)) != SR_OK) {
307                         sr_err("Failed to init device.");
308                         break;
309                 }
310
311                 sr_info("Opened device on %d.%d (logical) / %s (physical), interface %d.",
312                         usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
313
314                 ret = SR_OK;
315
316                 break;
317         }
318
319         libusb_free_device_list(devlist, 1);
320
321         if (ret != SR_OK) {
322                 if (usb->devhdl) {
323                         libusb_release_interface(usb->devhdl, USB_INTERFACE);
324                         libusb_close(usb->devhdl);
325                         usb->devhdl = NULL;
326                 }
327                 return SR_ERR;
328         }
329
330         return SR_OK;
331 }
332
333 static int dev_open(struct sr_dev_inst *sdi)
334 {
335         struct dev_context *devc;
336         int64_t timediff_us, timediff_ms;
337         uint64_t reset_done;
338         uint64_t now;
339         int ret;
340
341         devc = sdi->priv;
342
343         /*
344          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
345          * milliseconds for the FX2 to renumerate.
346          */
347         ret = SR_ERR;
348         if (devc->fw_updated > 0) {
349                 sr_info("Waiting for device to reset after firmware upload.");
350                 /* Takes >= 2000ms for the uC to be gone from the USB bus. */
351                 reset_done = devc->fw_updated + 18 * (uint64_t)1e5; /* 1.8 seconds */
352                 now = g_get_monotonic_time();
353                 if (reset_done > now)
354                         g_usleep(reset_done - now);
355                 timediff_ms = 0;
356                 while (timediff_ms < MAX_RENUM_DELAY_MS) {
357                         g_usleep(200 * 1000);
358
359                         timediff_us = g_get_monotonic_time() - devc->fw_updated;
360                         timediff_ms = timediff_us / 1000;
361
362                         if ((ret = la2016_dev_open(sdi)) == SR_OK)
363                                 break;
364                         sr_spew("Waited %" PRIi64 "ms.", timediff_ms);
365                 }
366                 if (ret != SR_OK) {
367                         sr_err("Device failed to re-enumerate.");
368                         return SR_ERR;
369                 }
370                 sr_info("Device came back after %" PRIi64 "ms.", timediff_ms);
371         } else {
372                 ret = la2016_dev_open(sdi);
373         }
374
375         if (ret != SR_OK) {
376                 sr_err("Unable to open device.");
377                 return SR_ERR;
378         }
379
380         return SR_OK;
381 }
382
383 static int dev_close(struct sr_dev_inst *sdi)
384 {
385         struct sr_usb_dev_inst *usb;
386
387         usb = sdi->conn;
388
389         if (!usb->devhdl)
390                 return SR_ERR_BUG;
391
392         la2016_deinit_device(sdi);
393
394         sr_info("Closing device on %d.%d (logical) / %s (physical) interface %d.",
395                 usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
396         libusb_release_interface(usb->devhdl, USB_INTERFACE);
397         libusb_close(usb->devhdl);
398         usb->devhdl = NULL;
399
400         return SR_OK;
401 }
402
403 static int config_get(uint32_t key, GVariant **data,
404         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
405 {
406         struct dev_context *devc;
407         struct sr_usb_dev_inst *usb;
408         double rounded;
409
410         (void)cg;
411
412         if (!sdi)
413                 return SR_ERR_ARG;
414         devc = sdi->priv;
415
416         switch (key) {
417         case SR_CONF_CONN:
418                 if (!sdi->conn)
419                         return SR_ERR_ARG;
420                 usb = sdi->conn;
421                 if (usb->address == 255) {
422                         /* Device still needs to re-enumerate after firmware
423                          * upload, so we don't know its (future) address. */
424                         return SR_ERR;
425                 }
426                 *data = g_variant_new_printf("%d.%d", usb->bus, usb->address);
427                 break;
428         case SR_CONF_SAMPLERATE:
429                 *data = g_variant_new_uint64(devc->cur_samplerate);
430                 break;
431         case SR_CONF_LIMIT_SAMPLES:
432                 *data = g_variant_new_uint64(devc->limit_samples);
433                 break;
434         case SR_CONF_CAPTURE_RATIO:
435                 *data = g_variant_new_uint64(devc->capture_ratio);
436                 break;
437         case SR_CONF_VOLTAGE_THRESHOLD:
438                 rounded = (int)(devc->threshold_voltage / 0.1) * 0.1;
439                 *data = std_gvar_tuple_double(rounded, rounded + 0.1);
440                 return SR_OK;
441         case SR_CONF_LOGIC_THRESHOLD:
442                 *data = g_variant_new_string(logic_threshold[devc->threshold_voltage_idx]);
443                 break;
444         case SR_CONF_LOGIC_THRESHOLD_CUSTOM:
445                 *data = g_variant_new_double(devc->threshold_voltage);
446                 break;
447
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         double low, high;
460         int idx;
461
462         (void)cg;
463
464         devc = sdi->priv;
465
466         switch (key) {
467         case SR_CONF_SAMPLERATE:
468                 devc->cur_samplerate = g_variant_get_uint64(data);
469                 break;
470         case SR_CONF_LIMIT_SAMPLES:
471                 devc->limit_samples = g_variant_get_uint64(data);
472                 break;
473         case SR_CONF_CAPTURE_RATIO:
474                 devc->capture_ratio = g_variant_get_uint64(data);
475                 break;
476         case SR_CONF_VOLTAGE_THRESHOLD:
477                 g_variant_get(data, "(dd)", &low, &high);
478                 devc->threshold_voltage = (low + high) / 2.0;
479                 devc->threshold_voltage_idx = MAX_NUM_LOGIC_THRESHOLD_ENTRIES - 1; /* USER */
480                 break;
481         case SR_CONF_LOGIC_THRESHOLD: {
482                 if ((idx = std_str_idx(data, logic_threshold, MAX_NUM_LOGIC_THRESHOLD_ENTRIES)) < 0)
483                         return SR_ERR_ARG;
484                 if (idx == MAX_NUM_LOGIC_THRESHOLD_ENTRIES - 1) {
485                         /* user threshold */
486                 } else {
487                         devc->threshold_voltage = logic_threshold_value[idx];
488                 }
489                 devc->threshold_voltage_idx = idx;
490                 break;
491         }
492         case SR_CONF_LOGIC_THRESHOLD_CUSTOM:
493                 devc->threshold_voltage = g_variant_get_double(data);
494                 break;
495         default:
496                 return SR_ERR_NA;
497         }
498
499         return SR_OK;
500 }
501
502 static int config_list(uint32_t key, GVariant **data,
503         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
504 {
505         struct dev_context *devc;
506
507         switch (key) {
508         case SR_CONF_SCAN_OPTIONS:
509         case SR_CONF_DEVICE_OPTIONS:
510                 return STD_CONFIG_LIST(key, data, sdi, cg, scanopts, drvopts, devopts);
511         case SR_CONF_SAMPLERATE:
512                 if (!sdi)
513                         return SR_ERR_ARG;
514                 devc = sdi->priv;
515                 if (devc->max_samplerate == SR_MHZ(200)) {
516                         *data = std_gvar_samplerates(ARRAY_AND_SIZE(samplerates_la2016));
517                 }
518                 else {
519                         *data = std_gvar_samplerates(ARRAY_AND_SIZE(samplerates_la1016));
520                 }
521                 break;
522         case SR_CONF_LIMIT_SAMPLES:
523                 *data = std_gvar_tuple_u64(LA2016_NUM_SAMPLES_MIN, LA2016_NUM_SAMPLES_MAX);
524                 break;
525         case SR_CONF_VOLTAGE_THRESHOLD:
526                 *data = std_gvar_min_max_step_thresholds(
527                         LA2016_THR_VOLTAGE_MIN,
528                         LA2016_THR_VOLTAGE_MAX, 0.1);
529                 break;
530         case SR_CONF_TRIGGER_MATCH:
531                 *data = std_gvar_array_i32(ARRAY_AND_SIZE(trigger_matches));
532                 break;
533         case SR_CONF_LOGIC_THRESHOLD:
534                 *data = g_variant_new_strv(logic_threshold, MAX_NUM_LOGIC_THRESHOLD_ENTRIES);
535                 break;
536         default:
537                 return SR_ERR_NA;
538         }
539
540         return SR_OK;
541 }
542
543 static void send_chunk(struct sr_dev_inst *sdi,
544         const uint8_t *packets, unsigned int num_tfers)
545 {
546         struct dev_context *devc;
547         struct sr_datafeed_logic logic;
548         struct sr_datafeed_packet sr_packet;
549         unsigned int max_samples, n_samples, total_samples, free_n_samples;
550         unsigned int i, j, k;
551         int do_signal_trigger;
552         uint16_t *wp;
553         const uint8_t *rp;
554         uint16_t state;
555         uint8_t repetitions;
556
557         devc = sdi->priv;
558
559         logic.unitsize = 2;
560         logic.data = devc->convbuffer;
561
562         sr_packet.type = SR_DF_LOGIC;
563         sr_packet.payload = &logic;
564
565         max_samples = devc->convbuffer_size / 2;
566         n_samples = 0;
567         wp = (uint16_t *)devc->convbuffer;
568         total_samples = 0;
569         do_signal_trigger = 0;
570
571         if (devc->had_triggers_configured && devc->reading_behind_trigger == 0 && devc->info.n_rep_packets_before_trigger == 0) {
572                 std_session_send_df_trigger(sdi);
573                 devc->reading_behind_trigger = 1;
574         }
575
576         rp = packets;
577         for (i = 0; i < num_tfers; i++) {
578                 for (k = 0; k < NUM_PACKETS_IN_CHUNK; k++) {
579                         free_n_samples = max_samples - n_samples;
580                         if (free_n_samples < 256 || do_signal_trigger) {
581                                 logic.length = n_samples * 2;
582                                 sr_session_send(sdi, &sr_packet);
583                                 n_samples = 0;
584                                 wp = (uint16_t *)devc->convbuffer;
585                                 if (do_signal_trigger) {
586                                         std_session_send_df_trigger(sdi);
587                                         do_signal_trigger = 0;
588                                 }
589                         }
590
591                         state = read_u16le_inc(&rp);
592                         repetitions = read_u8_inc(&rp);
593                         for (j = 0; j < repetitions; j++)
594                                 *wp++ = state;
595
596                         n_samples += repetitions;
597                         total_samples += repetitions;
598                         devc->total_samples += repetitions;
599                         if (!devc->reading_behind_trigger) {
600                                 devc->n_reps_until_trigger--;
601                                 if (devc->n_reps_until_trigger == 0) {
602                                         devc->reading_behind_trigger = 1;
603                                         do_signal_trigger = 1;
604                                         sr_dbg("  here is trigger position after %" PRIu64 " samples, %.6fms",
605                                                devc->total_samples,
606                                                (double)devc->total_samples / devc->cur_samplerate * 1e3);
607                                 }
608                         }
609                 }
610                 (void)read_u8_inc(&rp); /* Skip sequence number. */
611         }
612         if (n_samples) {
613                 logic.length = n_samples * 2;
614                 sr_session_send(sdi, &sr_packet);
615                 if (do_signal_trigger) {
616                         std_session_send_df_trigger(sdi);
617                 }
618         }
619         sr_dbg("send_chunk done after %d samples", total_samples);
620 }
621
622 static void LIBUSB_CALL receive_transfer(struct libusb_transfer *transfer)
623 {
624         struct sr_dev_inst *sdi;
625         struct dev_context *devc;
626         struct sr_usb_dev_inst *usb;
627         int ret;
628
629         sdi = transfer->user_data;
630         devc = sdi->priv;
631         usb = sdi->conn;
632
633         sr_dbg("receive_transfer(): status %s received %d bytes.",
634                libusb_error_name(transfer->status), transfer->actual_length);
635
636         if (transfer->status == LIBUSB_TRANSFER_TIMED_OUT) {
637                 sr_err("bulk transfer timeout!");
638                 devc->transfer_finished = 1;
639         }
640         send_chunk(sdi, transfer->buffer, transfer->actual_length / TRANSFER_PACKET_LENGTH);
641
642         devc->n_bytes_to_read -= transfer->actual_length;
643         if (devc->n_bytes_to_read) {
644                 uint32_t to_read = devc->n_bytes_to_read;
645                 /* determine read size for the next usb transfer */
646                 if (to_read >= LA2016_USB_BUFSZ)
647                         to_read = LA2016_USB_BUFSZ;
648                 else /* last transfer, make read size some multiple of LA2016_EP6_PKTSZ */
649                         to_read = (to_read + (LA2016_EP6_PKTSZ-1)) & ~(LA2016_EP6_PKTSZ-1);
650                 libusb_fill_bulk_transfer(
651                         transfer, usb->devhdl,
652                         0x86, transfer->buffer, to_read,
653                         receive_transfer, (void *)sdi, DEFAULT_TIMEOUT_MS);
654
655                 if ((ret = libusb_submit_transfer(transfer)) == 0)
656                         return;
657                 sr_err("Failed to submit further transfer: %s.", libusb_error_name(ret));
658         }
659
660         g_free(transfer->buffer);
661         libusb_free_transfer(transfer);
662         devc->transfer_finished = 1;
663 }
664
665 static int handle_event(int fd, int revents, void *cb_data)
666 {
667         const struct sr_dev_inst *sdi;
668         struct dev_context *devc;
669         struct drv_context *drvc;
670         struct timeval tv;
671
672         (void)fd;
673         (void)revents;
674
675         sdi = cb_data;
676         devc = sdi->priv;
677         drvc = sdi->driver->context;
678
679         if (devc->have_trigger == 0) {
680                 if (la2016_has_triggered(sdi) == 0) {
681                         /* not yet ready for download */
682                         return TRUE;
683                 }
684                 devc->have_trigger = 1;
685                 devc->transfer_finished = 0;
686                 devc->reading_behind_trigger = 0;
687                 devc->total_samples = 0;
688                 /* we can start retrieving data! */
689                 if (la2016_start_retrieval(sdi, receive_transfer) != SR_OK) {
690                         sr_err("failed to start retrieval!");
691                         return FALSE;
692                 }
693                 sr_dbg("retrieval is started...");
694                 std_session_send_df_frame_begin(sdi);
695
696                 return TRUE;
697         }
698
699         tv.tv_sec = tv.tv_usec = 0;
700         libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
701
702         if (devc->transfer_finished) {
703                 sr_dbg("transfer is finished!");
704                 std_session_send_df_frame_end(sdi);
705
706                 usb_source_remove(sdi->session, drvc->sr_ctx);
707                 std_session_send_df_end(sdi);
708
709                 la2016_stop_acquisition(sdi);
710
711                 g_free(devc->convbuffer);
712                 devc->convbuffer = NULL;
713
714                 devc->transfer = NULL;
715
716                 sr_dbg("transfer is now finished");
717         }
718
719         return TRUE;
720 }
721
722 static void abort_acquisition(struct dev_context *devc)
723 {
724         if (devc->transfer)
725                 libusb_cancel_transfer(devc->transfer);
726 }
727
728 static int configure_channels(const struct sr_dev_inst *sdi)
729 {
730         struct dev_context *devc;
731
732         devc = sdi->priv;
733         devc->cur_channels = 0;
734         devc->num_channels = 0;
735
736         for (GSList *l = sdi->channels; l; l = l->next) {
737                 struct sr_channel *ch = (struct sr_channel*)l->data;
738                 if (ch->enabled == FALSE)
739                         continue;
740                 devc->cur_channels |= 1 << ch->index;
741                 devc->num_channels++;
742         }
743
744         return SR_OK;
745 }
746
747 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
748 {
749         struct sr_dev_driver *di;
750         struct drv_context *drvc;
751         struct dev_context *devc;
752         int ret;
753
754         di = sdi->driver;
755         drvc = di->context;
756         devc = sdi->priv;
757
758         if (configure_channels(sdi) != SR_OK) {
759                 sr_err("Failed to configure channels.");
760                 return SR_ERR;
761         }
762
763         devc->convbuffer_size = 4 * 1024 * 1024;
764         if (!(devc->convbuffer = g_try_malloc(devc->convbuffer_size))) {
765                 sr_err("Conversion buffer malloc failed.");
766                 return SR_ERR_MALLOC;
767         }
768
769         if ((ret = la2016_setup_acquisition(sdi)) != SR_OK) {
770                 g_free(devc->convbuffer);
771                 devc->convbuffer = NULL;
772                 return ret;
773         }
774
775         devc->ctx = drvc->sr_ctx;
776
777         if ((ret = la2016_start_acquisition(sdi)) != SR_OK) {
778                 abort_acquisition(devc);
779                 return ret;
780         }
781
782         devc->have_trigger = 0;
783         usb_source_add(sdi->session, drvc->sr_ctx, 50, handle_event, (void *)sdi);
784
785         std_session_send_df_header(sdi);
786
787         return SR_OK;
788 }
789
790 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
791 {
792         int ret;
793
794         ret = la2016_abort_acquisition(sdi);
795         abort_acquisition(sdi->priv);
796
797         return ret;
798 }
799
800 static struct sr_dev_driver kingst_la2016_driver_info = {
801         .name = "kingst-la2016",
802         .longname = "Kingst LA2016",
803         .api_version = 1,
804         .init = std_init,
805         .cleanup = std_cleanup,
806         .scan = scan,
807         .dev_list = std_dev_list,
808         .dev_clear = std_dev_clear,
809         .config_get = config_get,
810         .config_set = config_set,
811         .config_list = config_list,
812         .dev_open = dev_open,
813         .dev_close = dev_close,
814         .dev_acquisition_start = dev_acquisition_start,
815         .dev_acquisition_stop = dev_acquisition_stop,
816         .context = NULL,
817 };
818 SR_REGISTER_DEV_DRIVER(kingst_la2016_driver_info);