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2f937611 UH |
1 | /* |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2013 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 | ||
a7d7f93c BV |
21 | #include <glib.h> |
22 | #include <glib/gstdio.h> | |
2f937611 | 23 | #include "protocol.h" |
b9d53092 | 24 | #include "dslogic.h" |
2f937611 | 25 | |
2f937611 UH |
26 | #pragma pack(push, 1) |
27 | ||
28 | struct version_info { | |
29 | uint8_t major; | |
30 | uint8_t minor; | |
31 | }; | |
32 | ||
33 | struct cmd_start_acquisition { | |
34 | uint8_t flags; | |
35 | uint8_t sample_delay_h; | |
36 | uint8_t sample_delay_l; | |
37 | }; | |
38 | ||
39 | #pragma pack(pop) | |
40 | ||
4df5739a UH |
41 | #define USB_TIMEOUT 100 |
42 | ||
2f937611 UH |
43 | static int command_get_fw_version(libusb_device_handle *devhdl, |
44 | struct version_info *vi) | |
45 | { | |
46 | int ret; | |
47 | ||
48 | ret = libusb_control_transfer(devhdl, LIBUSB_REQUEST_TYPE_VENDOR | | |
49 | LIBUSB_ENDPOINT_IN, CMD_GET_FW_VERSION, 0x0000, 0x0000, | |
4df5739a | 50 | (unsigned char *)vi, sizeof(struct version_info), USB_TIMEOUT); |
2f937611 UH |
51 | |
52 | if (ret < 0) { | |
53 | sr_err("Unable to get version info: %s.", | |
54 | libusb_error_name(ret)); | |
55 | return SR_ERR; | |
56 | } | |
57 | ||
58 | return SR_OK; | |
59 | } | |
60 | ||
a54edb1d | 61 | static int command_get_revid_version(struct sr_dev_inst *sdi, uint8_t *revid) |
2f937611 | 62 | { |
a7d7f93c | 63 | struct dev_context *devc = sdi->priv; |
a54edb1d ML |
64 | struct sr_usb_dev_inst *usb = sdi->conn; |
65 | libusb_device_handle *devhdl = usb->devhdl; | |
a7d7f93c | 66 | int cmd, ret; |
2f937611 | 67 | |
b9d53092 | 68 | cmd = devc->dslogic ? DS_CMD_GET_REVID_VERSION : CMD_GET_REVID_VERSION; |
2f937611 | 69 | ret = libusb_control_transfer(devhdl, LIBUSB_REQUEST_TYPE_VENDOR | |
4df5739a | 70 | LIBUSB_ENDPOINT_IN, cmd, 0x0000, 0x0000, revid, 1, USB_TIMEOUT); |
2f937611 UH |
71 | |
72 | if (ret < 0) { | |
73 | sr_err("Unable to get REVID: %s.", libusb_error_name(ret)); | |
74 | return SR_ERR; | |
75 | } | |
76 | ||
77 | return SR_OK; | |
78 | } | |
79 | ||
a54edb1d | 80 | SR_PRIV int fx2lafw_command_start_acquisition(const struct sr_dev_inst *sdi) |
2f937611 | 81 | { |
81a34976 BV |
82 | struct dev_context *devc; |
83 | struct sr_usb_dev_inst *usb; | |
84 | uint64_t samplerate; | |
85 | struct cmd_start_acquisition cmd; | |
86 | int delay, ret; | |
87 | ||
88 | devc = sdi->priv; | |
89 | usb = sdi->conn; | |
90 | samplerate = devc->cur_samplerate; | |
2f937611 UH |
91 | |
92 | /* Compute the sample rate. */ | |
81a34976 | 93 | if (devc->sample_wide && samplerate > MAX_16BIT_SAMPLE_RATE) { |
2f937611 UH |
94 | sr_err("Unable to sample at %" PRIu64 "Hz " |
95 | "when collecting 16-bit samples.", samplerate); | |
96 | return SR_ERR; | |
97 | } | |
98 | ||
81a34976 BV |
99 | delay = 0; |
100 | cmd.flags = cmd.sample_delay_h = cmd.sample_delay_l = 0; | |
2f937611 UH |
101 | if ((SR_MHZ(48) % samplerate) == 0) { |
102 | cmd.flags = CMD_START_FLAGS_CLK_48MHZ; | |
103 | delay = SR_MHZ(48) / samplerate - 1; | |
104 | if (delay > MAX_SAMPLE_DELAY) | |
105 | delay = 0; | |
106 | } | |
107 | ||
108 | if (delay == 0 && (SR_MHZ(30) % samplerate) == 0) { | |
109 | cmd.flags = CMD_START_FLAGS_CLK_30MHZ; | |
110 | delay = SR_MHZ(30) / samplerate - 1; | |
111 | } | |
112 | ||
b9d53092 | 113 | sr_dbg("GPIF delay = %d, clocksource = %sMHz.", delay, |
2f937611 UH |
114 | (cmd.flags & CMD_START_FLAGS_CLK_48MHZ) ? "48" : "30"); |
115 | ||
116 | if (delay <= 0 || delay > MAX_SAMPLE_DELAY) { | |
117 | sr_err("Unable to sample at %" PRIu64 "Hz.", samplerate); | |
118 | return SR_ERR; | |
119 | } | |
120 | ||
121 | cmd.sample_delay_h = (delay >> 8) & 0xff; | |
122 | cmd.sample_delay_l = delay & 0xff; | |
123 | ||
124 | /* Select the sampling width. */ | |
81a34976 | 125 | cmd.flags |= devc->sample_wide ? CMD_START_FLAGS_SAMPLE_16BIT : |
2f937611 UH |
126 | CMD_START_FLAGS_SAMPLE_8BIT; |
127 | ||
128 | /* Send the control message. */ | |
81a34976 | 129 | ret = libusb_control_transfer(usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR | |
2f937611 | 130 | LIBUSB_ENDPOINT_OUT, CMD_START, 0x0000, 0x0000, |
4df5739a | 131 | (unsigned char *)&cmd, sizeof(cmd), USB_TIMEOUT); |
2f937611 UH |
132 | if (ret < 0) { |
133 | sr_err("Unable to send start command: %s.", | |
134 | libusb_error_name(ret)); | |
135 | return SR_ERR; | |
136 | } | |
137 | ||
138 | return SR_OK; | |
139 | } | |
140 | ||
141 | /** | |
142 | * Check the USB configuration to determine if this is an fx2lafw device. | |
143 | * | |
a7d7f93c | 144 | * @return TRUE if the device's configuration profile matches fx2lafw |
6fcf3f0a | 145 | * configuration, FALSE otherwise. |
2f937611 | 146 | */ |
a7d7f93c BV |
147 | SR_PRIV gboolean match_manuf_prod(libusb_device *dev, const char *manufacturer, |
148 | const char *product) | |
2f937611 UH |
149 | { |
150 | struct libusb_device_descriptor des; | |
151 | struct libusb_device_handle *hdl; | |
152 | gboolean ret; | |
153 | unsigned char strdesc[64]; | |
154 | ||
155 | hdl = NULL; | |
156 | ret = FALSE; | |
157 | while (!ret) { | |
158 | /* Assume the FW has not been loaded, unless proven wrong. */ | |
159 | if (libusb_get_device_descriptor(dev, &des) != 0) | |
160 | break; | |
161 | ||
162 | if (libusb_open(dev, &hdl) != 0) | |
163 | break; | |
164 | ||
165 | if (libusb_get_string_descriptor_ascii(hdl, | |
a7d7f93c | 166 | des.iManufacturer, strdesc, sizeof(strdesc)) < 0) |
2f937611 | 167 | break; |
bc497772 | 168 | if (strcmp((const char *)strdesc, manufacturer)) |
2f937611 UH |
169 | break; |
170 | ||
171 | if (libusb_get_string_descriptor_ascii(hdl, | |
172 | des.iProduct, strdesc, sizeof(strdesc)) < 0) | |
173 | break; | |
bc497772 | 174 | if (strcmp((const char *)strdesc, product)) |
2f937611 UH |
175 | break; |
176 | ||
2f937611 UH |
177 | ret = TRUE; |
178 | } | |
179 | if (hdl) | |
180 | libusb_close(hdl); | |
181 | ||
182 | return ret; | |
183 | } | |
184 | ||
185 | SR_PRIV int fx2lafw_dev_open(struct sr_dev_inst *sdi, struct sr_dev_driver *di) | |
186 | { | |
187 | libusb_device **devlist; | |
188 | struct sr_usb_dev_inst *usb; | |
189 | struct libusb_device_descriptor des; | |
190 | struct dev_context *devc; | |
191 | struct drv_context *drvc; | |
192 | struct version_info vi; | |
5e2c86eb | 193 | int ret, i, device_count; |
2f937611 | 194 | uint8_t revid; |
5e2c86eb | 195 | char connection_id[64]; |
2f937611 | 196 | |
41812aca | 197 | drvc = di->context; |
2f937611 UH |
198 | devc = sdi->priv; |
199 | usb = sdi->conn; | |
200 | ||
201 | if (sdi->status == SR_ST_ACTIVE) | |
202 | /* Device is already in use. */ | |
203 | return SR_ERR; | |
204 | ||
2f937611 UH |
205 | device_count = libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist); |
206 | if (device_count < 0) { | |
207 | sr_err("Failed to get device list: %s.", | |
208 | libusb_error_name(device_count)); | |
209 | return SR_ERR; | |
210 | } | |
211 | ||
212 | for (i = 0; i < device_count; i++) { | |
213 | if ((ret = libusb_get_device_descriptor(devlist[i], &des))) { | |
214 | sr_err("Failed to get device descriptor: %s.", | |
215 | libusb_error_name(ret)); | |
216 | continue; | |
217 | } | |
218 | ||
219 | if (des.idVendor != devc->profile->vid | |
220 | || des.idProduct != devc->profile->pid) | |
221 | continue; | |
222 | ||
5e2c86eb SA |
223 | if ((sdi->status == SR_ST_INITIALIZING) || |
224 | (sdi->status == SR_ST_INACTIVE)) { | |
2f937611 | 225 | /* |
5e2c86eb | 226 | * Check device by its physical USB bus/port address. |
2f937611 | 227 | */ |
5e2c86eb SA |
228 | usb_get_port_path(devlist[i], connection_id, sizeof(connection_id)); |
229 | if (strcmp(sdi->connection_id, connection_id)) | |
2f937611 UH |
230 | /* This is not the one. */ |
231 | continue; | |
232 | } | |
233 | ||
234 | if (!(ret = libusb_open(devlist[i], &usb->devhdl))) { | |
235 | if (usb->address == 0xff) | |
236 | /* | |
237 | * First time we touch this device after FW | |
238 | * upload, so we don't know the address yet. | |
239 | */ | |
240 | usb->address = libusb_get_device_address(devlist[i]); | |
241 | } else { | |
242 | sr_err("Failed to open device: %s.", | |
243 | libusb_error_name(ret)); | |
244 | break; | |
245 | } | |
246 | ||
dc2903bb | 247 | if (libusb_has_capability(LIBUSB_CAP_SUPPORTS_DETACH_KERNEL_DRIVER)) { |
c11a1e61 UH |
248 | if (libusb_kernel_driver_active(usb->devhdl, USB_INTERFACE) == 1) { |
249 | if ((ret = libusb_detach_kernel_driver(usb->devhdl, USB_INTERFACE)) < 0) { | |
dc2903bb UH |
250 | sr_err("Failed to detach kernel driver: %s.", |
251 | libusb_error_name(ret)); | |
252 | return SR_ERR; | |
253 | } | |
254 | } | |
255 | } | |
256 | ||
2f937611 UH |
257 | ret = command_get_fw_version(usb->devhdl, &vi); |
258 | if (ret != SR_OK) { | |
259 | sr_err("Failed to get firmware version."); | |
260 | break; | |
261 | } | |
262 | ||
a54edb1d | 263 | ret = command_get_revid_version(sdi, &revid); |
2f937611 UH |
264 | if (ret != SR_OK) { |
265 | sr_err("Failed to get REVID."); | |
266 | break; | |
267 | } | |
268 | ||
269 | /* | |
270 | * Changes in major version mean incompatible/API changes, so | |
271 | * bail out if we encounter an incompatible version. | |
272 | * Different minor versions are OK, they should be compatible. | |
273 | */ | |
274 | if (vi.major != FX2LAFW_REQUIRED_VERSION_MAJOR) { | |
275 | sr_err("Expected firmware version %d.x, " | |
276 | "got %d.%d.", FX2LAFW_REQUIRED_VERSION_MAJOR, | |
277 | vi.major, vi.minor); | |
278 | break; | |
279 | } | |
280 | ||
281 | sdi->status = SR_ST_ACTIVE; | |
5e2c86eb | 282 | sr_info("Opened device on %d.%d (logical) / %s (physical), " |
2f937611 | 283 | "interface %d, firmware %d.%d.", |
5e2c86eb | 284 | usb->bus, usb->address, connection_id, |
2f937611 UH |
285 | USB_INTERFACE, vi.major, vi.minor); |
286 | ||
287 | sr_info("Detected REVID=%d, it's a Cypress CY7C68013%s.", | |
288 | revid, (revid != 1) ? " (FX2)" : "A (FX2LP)"); | |
289 | ||
290 | break; | |
291 | } | |
292 | libusb_free_device_list(devlist, 1); | |
293 | ||
294 | if (sdi->status != SR_ST_ACTIVE) | |
295 | return SR_ERR; | |
296 | ||
297 | return SR_OK; | |
298 | } | |
299 | ||
2f937611 UH |
300 | SR_PRIV struct dev_context *fx2lafw_dev_new(void) |
301 | { | |
302 | struct dev_context *devc; | |
303 | ||
f57d8ffe | 304 | devc = g_malloc0(sizeof(struct dev_context)); |
2f937611 UH |
305 | devc->profile = NULL; |
306 | devc->fw_updated = 0; | |
307 | devc->cur_samplerate = 0; | |
308 | devc->limit_samples = 0; | |
7bfcb25c | 309 | devc->capture_ratio = 0; |
87b545fb | 310 | devc->sample_wide = FALSE; |
335122f0 | 311 | devc->stl = NULL; |
2f937611 UH |
312 | |
313 | return devc; | |
314 | } | |
315 | ||
316 | SR_PRIV void fx2lafw_abort_acquisition(struct dev_context *devc) | |
317 | { | |
318 | int i; | |
319 | ||
b0ccd64d | 320 | devc->acq_aborted = TRUE; |
2f937611 UH |
321 | |
322 | for (i = devc->num_transfers - 1; i >= 0; i--) { | |
323 | if (devc->transfers[i]) | |
324 | libusb_cancel_transfer(devc->transfers[i]); | |
325 | } | |
326 | } | |
327 | ||
102f1239 | 328 | static void finish_acquisition(struct sr_dev_inst *sdi) |
2f937611 UH |
329 | { |
330 | struct sr_datafeed_packet packet; | |
102f1239 BV |
331 | struct dev_context *devc; |
332 | ||
333 | devc = sdi->priv; | |
2f937611 UH |
334 | |
335 | /* Terminate session. */ | |
336 | packet.type = SR_DF_END; | |
102f1239 | 337 | sr_session_send(sdi, &packet); |
2f937611 UH |
338 | |
339 | /* Remove fds from polling. */ | |
102f1239 | 340 | usb_source_remove(sdi->session, devc->ctx); |
2f937611 UH |
341 | |
342 | devc->num_transfers = 0; | |
343 | g_free(devc->transfers); | |
335122f0 BV |
344 | |
345 | if (devc->stl) { | |
346 | soft_trigger_logic_free(devc->stl); | |
347 | devc->stl = NULL; | |
348 | } | |
2f937611 UH |
349 | } |
350 | ||
351 | static void free_transfer(struct libusb_transfer *transfer) | |
352 | { | |
9615eeb5 | 353 | struct sr_dev_inst *sdi; |
2f937611 UH |
354 | struct dev_context *devc; |
355 | unsigned int i; | |
356 | ||
9615eeb5 BV |
357 | sdi = transfer->user_data; |
358 | devc = sdi->priv; | |
2f937611 UH |
359 | |
360 | g_free(transfer->buffer); | |
361 | transfer->buffer = NULL; | |
362 | libusb_free_transfer(transfer); | |
363 | ||
364 | for (i = 0; i < devc->num_transfers; i++) { | |
365 | if (devc->transfers[i] == transfer) { | |
366 | devc->transfers[i] = NULL; | |
367 | break; | |
368 | } | |
369 | } | |
370 | ||
371 | devc->submitted_transfers--; | |
372 | if (devc->submitted_transfers == 0) | |
102f1239 | 373 | finish_acquisition(sdi); |
2f937611 UH |
374 | } |
375 | ||
376 | static void resubmit_transfer(struct libusb_transfer *transfer) | |
377 | { | |
378 | int ret; | |
379 | ||
380 | if ((ret = libusb_submit_transfer(transfer)) == LIBUSB_SUCCESS) | |
381 | return; | |
382 | ||
9615eeb5 | 383 | sr_err("%s: %s", __func__, libusb_error_name(ret)); |
2f937611 | 384 | free_transfer(transfer); |
2f937611 | 385 | |
9615eeb5 BV |
386 | } |
387 | ||
55462b8b | 388 | SR_PRIV void LIBUSB_CALL fx2lafw_receive_transfer(struct libusb_transfer *transfer) |
2f937611 | 389 | { |
9615eeb5 BV |
390 | struct sr_dev_inst *sdi; |
391 | struct dev_context *devc; | |
2f937611 UH |
392 | gboolean packet_has_error = FALSE; |
393 | struct sr_datafeed_packet packet; | |
394 | struct sr_datafeed_logic logic; | |
9615eeb5 BV |
395 | unsigned int num_samples; |
396 | int trigger_offset, cur_sample_count, unitsize; | |
7bfcb25c | 397 | int pre_trigger_samples; |
2f937611 | 398 | |
9615eeb5 BV |
399 | sdi = transfer->user_data; |
400 | devc = sdi->priv; | |
2f937611 UH |
401 | |
402 | /* | |
403 | * If acquisition has already ended, just free any queued up | |
404 | * transfer that come in. | |
405 | */ | |
b0ccd64d | 406 | if (devc->acq_aborted) { |
2f937611 UH |
407 | free_transfer(transfer); |
408 | return; | |
409 | } | |
410 | ||
0f262763 UH |
411 | sr_dbg("receive_transfer(): status %s received %d bytes.", |
412 | libusb_error_name(transfer->status), transfer->actual_length); | |
2f937611 UH |
413 | |
414 | /* Save incoming transfer before reusing the transfer struct. */ | |
9615eeb5 BV |
415 | unitsize = devc->sample_wide ? 2 : 1; |
416 | cur_sample_count = transfer->actual_length / unitsize; | |
2f937611 UH |
417 | |
418 | switch (transfer->status) { | |
419 | case LIBUSB_TRANSFER_NO_DEVICE: | |
420 | fx2lafw_abort_acquisition(devc); | |
421 | free_transfer(transfer); | |
422 | return; | |
423 | case LIBUSB_TRANSFER_COMPLETED: | |
424 | case LIBUSB_TRANSFER_TIMED_OUT: /* We may have received some data though. */ | |
425 | break; | |
426 | default: | |
427 | packet_has_error = TRUE; | |
428 | break; | |
429 | } | |
430 | ||
431 | if (transfer->actual_length == 0 || packet_has_error) { | |
432 | devc->empty_transfer_count++; | |
433 | if (devc->empty_transfer_count > MAX_EMPTY_TRANSFERS) { | |
434 | /* | |
435 | * The FX2 gave up. End the acquisition, the frontend | |
436 | * will work out that the samplecount is short. | |
437 | */ | |
438 | fx2lafw_abort_acquisition(devc); | |
439 | free_transfer(transfer); | |
440 | } else { | |
441 | resubmit_transfer(transfer); | |
442 | } | |
443 | return; | |
444 | } else { | |
445 | devc->empty_transfer_count = 0; | |
446 | } | |
447 | ||
9615eeb5 | 448 | if (devc->trigger_fired) { |
2f663c82 | 449 | if (!devc->limit_samples || devc->sent_samples < devc->limit_samples) { |
9615eeb5 BV |
450 | /* Send the incoming transfer to the session bus. */ |
451 | packet.type = SR_DF_LOGIC; | |
452 | packet.payload = &logic; | |
2f663c82 | 453 | if (devc->limit_samples && devc->sent_samples + cur_sample_count > devc->limit_samples) |
9615eeb5 BV |
454 | num_samples = devc->limit_samples - devc->sent_samples; |
455 | else | |
456 | num_samples = cur_sample_count; | |
457 | logic.length = num_samples * unitsize; | |
458 | logic.unitsize = unitsize; | |
459 | logic.data = transfer->buffer; | |
460 | sr_session_send(devc->cb_data, &packet); | |
649e9e16 | 461 | devc->sent_samples += num_samples; |
9615eeb5 BV |
462 | } |
463 | } else { | |
335122f0 | 464 | trigger_offset = soft_trigger_logic_check(devc->stl, |
7bfcb25c | 465 | transfer->buffer, transfer->actual_length, &pre_trigger_samples); |
9615eeb5 | 466 | if (trigger_offset > -1) { |
7bfcb25c | 467 | devc->sent_samples += pre_trigger_samples; |
9615eeb5 BV |
468 | packet.type = SR_DF_LOGIC; |
469 | packet.payload = &logic; | |
470 | num_samples = cur_sample_count - trigger_offset; | |
471 | if (devc->limit_samples && | |
472 | num_samples > devc->limit_samples - devc->sent_samples) | |
473 | num_samples = devc->limit_samples - devc->sent_samples; | |
474 | logic.length = num_samples * unitsize; | |
475 | logic.unitsize = unitsize; | |
476 | logic.data = transfer->buffer + trigger_offset * unitsize; | |
477 | sr_session_send(devc->cb_data, &packet); | |
478 | devc->sent_samples += num_samples; | |
479 | ||
480 | devc->trigger_fired = TRUE; | |
2f937611 | 481 | } |
06b5d7f7 BV |
482 | } |
483 | ||
484 | if (devc->limit_samples && devc->sent_samples >= devc->limit_samples) { | |
485 | fx2lafw_abort_acquisition(devc); | |
486 | free_transfer(transfer); | |
9615eeb5 BV |
487 | } else |
488 | resubmit_transfer(transfer); | |
2f937611 UH |
489 | } |
490 | ||
491 | static unsigned int to_bytes_per_ms(unsigned int samplerate) | |
492 | { | |
493 | return samplerate / 1000; | |
494 | } | |
495 | ||
496 | SR_PRIV size_t fx2lafw_get_buffer_size(struct dev_context *devc) | |
497 | { | |
498 | size_t s; | |
499 | ||
500 | /* | |
501 | * The buffer should be large enough to hold 10ms of data and | |
502 | * a multiple of 512. | |
503 | */ | |
504 | s = 10 * to_bytes_per_ms(devc->cur_samplerate); | |
505 | return (s + 511) & ~511; | |
506 | } | |
507 | ||
508 | SR_PRIV unsigned int fx2lafw_get_number_of_transfers(struct dev_context *devc) | |
509 | { | |
510 | unsigned int n; | |
511 | ||
512 | /* Total buffer size should be able to hold about 500ms of data. */ | |
513 | n = (500 * to_bytes_per_ms(devc->cur_samplerate) / | |
514 | fx2lafw_get_buffer_size(devc)); | |
515 | ||
516 | if (n > NUM_SIMUL_TRANSFERS) | |
517 | return NUM_SIMUL_TRANSFERS; | |
518 | ||
519 | return n; | |
520 | } | |
521 | ||
522 | SR_PRIV unsigned int fx2lafw_get_timeout(struct dev_context *devc) | |
523 | { | |
524 | size_t total_size; | |
525 | unsigned int timeout; | |
526 | ||
527 | total_size = fx2lafw_get_buffer_size(devc) * | |
528 | fx2lafw_get_number_of_transfers(devc); | |
529 | timeout = total_size / to_bytes_per_ms(devc->cur_samplerate); | |
530 | return timeout + timeout / 4; /* Leave a headroom of 25% percent. */ | |
531 | } |