2 * This file is part of the libsigrok project.
4 * Copyright (C) 2010-2012 Bert Vermeulen <bert@biot.com>
5 * Copyright (C) 2010-2012 Uwe Hermann <uwe@hermann-uwe.de>
6 * Copyright (C) 2012 Alexandru Gagniuc <mr.nuke.me@gmail.com>
7 * Copyright (C) 2014 Uffe Jakobsen <uffe@uffe.org>
8 * Copyright (C) 2017-2019 Gerhard Sittig <gerhard.sittig@gmx.net>
10 * This program is free software: you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation, either version 3 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program. If not, see <http://www.gnu.org/licenses/>.
28 #include <glib/gstdio.h>
29 #ifdef HAVE_LIBSERIALPORT
30 #include <libserialport.h>
32 #include <libsigrok/libsigrok.h>
33 #include "libsigrok-internal.h"
35 #include <windows.h> /* for HANDLE */
39 #define LOG_PREFIX "serial"
45 * Serial port handling.
49 * @defgroup grp_serial Serial port handling
51 * Serial port handling functions.
56 #ifdef HAVE_SERIAL_COMM
58 /* See if a (assumed opened) serial port is of any supported type. */
59 static int dev_is_supported(struct sr_serial_dev_inst *serial)
63 if (!serial->lib_funcs)
70 * Open the specified serial port.
72 * @param serial Previously initialized serial port structure.
73 * @param[in] flags Flags to use when opening the serial port. Possible flags
74 * include SERIAL_RDWR, SERIAL_RDONLY.
76 * If the serial structure contains a serialcomm string, it will be
77 * passed to serial_set_paramstr() after the port is opened.
79 * @retval SR_OK Success.
80 * @retval SR_ERR Failure.
84 SR_PRIV int serial_open(struct sr_serial_dev_inst *serial, int flags)
89 sr_dbg("Invalid serial port.");
93 sr_spew("Opening serial port '%s' (flags %d).", serial->port, flags);
96 * Determine which serial transport library to use. Derive the
97 * variant from the serial port's name. Default to libserialport
98 * for backwards compatibility.
100 if (ser_name_is_hid(serial))
101 serial->lib_funcs = ser_lib_funcs_hid;
102 else if (ser_name_is_bt(serial))
103 serial->lib_funcs = ser_lib_funcs_bt;
105 serial->lib_funcs = ser_lib_funcs_libsp;
106 if (!serial->lib_funcs)
110 * Note that use of the 'rcv_buffer' is optional, and the buffer's
111 * size heavily depends on the specific transport. That's why the
112 * buffer's content gets accessed and the buffer is released here in
113 * common code, but the buffer gets allocated in libraries' open()
118 * Run the transport's open routine. Setup the bitrate and the
121 if (!serial->lib_funcs->open)
123 ret = serial->lib_funcs->open(serial, flags);
127 if (serial->serialcomm)
128 return serial_set_paramstr(serial, serial->serialcomm);
134 * Close the specified serial port.
136 * @param serial Previously initialized serial port structure.
138 * @retval SR_OK Success.
139 * @retval SR_ERR Failure.
143 SR_PRIV int serial_close(struct sr_serial_dev_inst *serial)
148 sr_dbg("Invalid serial port.");
152 sr_spew("Closing serial port %s.", serial->port);
154 if (!serial->lib_funcs || !serial->lib_funcs->close)
157 rc = serial->lib_funcs->close(serial);
158 if (rc == SR_OK && serial->rcv_buffer) {
159 g_string_free(serial->rcv_buffer, TRUE);
160 serial->rcv_buffer = NULL;
167 * Flush serial port buffers. Empty buffers, discard pending RX and TX data.
169 * @param serial Previously initialized serial port structure.
171 * @retval SR_OK Success.
172 * @retval SR_ERR Failure.
176 SR_PRIV int serial_flush(struct sr_serial_dev_inst *serial)
179 sr_dbg("Invalid serial port.");
183 sr_spew("Flushing serial port %s.", serial->port);
185 sr_ser_discard_queued_data(serial);
187 if (!serial->lib_funcs || !serial->lib_funcs->flush)
190 return serial->lib_funcs->flush(serial);
194 * Drain serial port buffers. Wait for pending TX data to be sent.
196 * @param serial Previously initialized serial port structure.
198 * @retval SR_OK Success.
199 * @retval SR_ERR Failure.
203 SR_PRIV int serial_drain(struct sr_serial_dev_inst *serial)
206 sr_dbg("Invalid serial port.");
210 sr_spew("Draining serial port %s.", serial->port);
212 if (!serial->lib_funcs || !serial->lib_funcs->drain)
215 return serial->lib_funcs->drain(serial);
219 * Provide an internal RX data buffer for the serial port. This is not
220 * supposed to be used directly by applications. Instead optional and
221 * alternative transports for serial communication can use this buffer
222 * if their progress is driven from background activity, and is not
223 * (directly) driven by external API calls.
225 * BEWARE! This implementation assumes that data which gets communicated
226 * via UART can get stored in a GString (which is a char array). Since
227 * the API hides this detail, we can address this issue later when needed.
228 * Callers use the API which communicates bytes.
232 * Discard previously queued RX data. Internal to the serial subsystem,
233 * coordination between common and transport specific support code.
235 * @param[in] serial Previously opened serial port instance.
239 SR_PRIV void sr_ser_discard_queued_data(struct sr_serial_dev_inst *serial)
243 if (!serial->rcv_buffer)
246 g_string_truncate(serial->rcv_buffer, 0);
250 * Get amount of queued RX data. Internal to the serial subsystem,
251 * coordination between common and transport specific support code.
253 * @param[in] serial Previously opened serial port instance.
257 SR_PRIV size_t sr_ser_has_queued_data(struct sr_serial_dev_inst *serial)
261 if (!serial->rcv_buffer)
264 return serial->rcv_buffer->len;
268 * Queue received data. Internal to the serial subsystem, coordination
269 * between common and transport specific support code.
271 * @param[in] serial Previously opened serial port instance.
272 * @param[in] data Pointer to data bytes to queue.
273 * @param[in] len Number of data bytes to queue.
277 SR_PRIV void sr_ser_queue_rx_data(struct sr_serial_dev_inst *serial,
278 const uint8_t *data, size_t len)
285 if (serial->rcv_buffer)
286 g_string_append_len(serial->rcv_buffer, (const gchar *)data, len);
290 * Retrieve previously queued RX data. Internal to the serial subsystem,
291 * coordination between common and transport specific support code.
293 * @param[in] serial Previously opened serial port instance.
294 * @param[out] data Pointer to store retrieved data bytes into.
295 * @param[in] len Number of data bytes to retrieve.
299 SR_PRIV size_t sr_ser_unqueue_rx_data(struct sr_serial_dev_inst *serial,
300 uint8_t *data, size_t len)
310 qlen = sr_ser_has_queued_data(serial);
314 buf = serial->rcv_buffer;
318 memcpy(data, buf->str, len);
319 g_string_erase(buf, 0, len);
326 * Check for available receive data.
328 * @param[in] serial Previously opened serial port instance.
330 * @returns The number of (known) available RX data bytes.
332 * Returns 0 if no receive data is available, or if the amount of
333 * available receive data cannot get determined.
335 SR_PRIV size_t serial_has_receive_data(struct sr_serial_dev_inst *serial)
337 size_t lib_count, buf_count;
343 if (serial->lib_funcs && serial->lib_funcs->get_rx_avail)
344 lib_count = serial->lib_funcs->get_rx_avail(serial);
346 buf_count = sr_ser_has_queued_data(serial);
348 return lib_count + buf_count;
351 static int _serial_write(struct sr_serial_dev_inst *serial,
352 const void *buf, size_t count,
353 int nonblocking, unsigned int timeout_ms)
358 sr_dbg("Invalid serial port.");
362 if (!serial->lib_funcs || !serial->lib_funcs->write)
364 ret = serial->lib_funcs->write(serial, buf, count,
365 nonblocking, timeout_ms);
366 sr_spew("Wrote %zd/%zu bytes.", ret, count);
372 * Write a number of bytes to the specified serial port, blocking until finished.
374 * @param serial Previously initialized serial port structure.
375 * @param[in] buf Buffer containing the bytes to write.
376 * @param[in] count Number of bytes to write.
377 * @param[in] timeout_ms Timeout in ms, or 0 for no timeout.
379 * @retval SR_ERR_ARG Invalid argument.
380 * @retval SR_ERR Other error.
381 * @retval other The number of bytes written. If this is less than the number
382 * specified in the call, the timeout was reached.
386 SR_PRIV int serial_write_blocking(struct sr_serial_dev_inst *serial,
387 const void *buf, size_t count, unsigned int timeout_ms)
389 return _serial_write(serial, buf, count, 0, timeout_ms);
393 * Write a number of bytes to the specified serial port, return immediately.
395 * @param serial Previously initialized serial port structure.
396 * @param[in] buf Buffer containing the bytes to write.
397 * @param[in] count Number of bytes to write.
399 * @retval SR_ERR_ARG Invalid argument.
400 * @retval SR_ERR Other error.
401 * @retval other The number of bytes written.
405 SR_PRIV int serial_write_nonblocking(struct sr_serial_dev_inst *serial,
406 const void *buf, size_t count)
408 return _serial_write(serial, buf, count, 1, 0);
411 static int _serial_read(struct sr_serial_dev_inst *serial,
412 void *buf, size_t count, int nonblocking, unsigned int timeout_ms)
417 sr_dbg("Invalid serial port.");
421 if (!serial->lib_funcs || !serial->lib_funcs->read)
423 ret = serial->lib_funcs->read(serial, buf, count,
424 nonblocking, timeout_ms);
426 sr_spew("Read %zd/%zu bytes.", ret, count);
432 * Read a number of bytes from the specified serial port, block until finished.
434 * @param serial Previously initialized serial port structure.
435 * @param buf Buffer where to store the bytes that are read.
436 * @param[in] count The number of bytes to read.
437 * @param[in] timeout_ms Timeout in ms, or 0 for no timeout.
439 * @retval SR_ERR_ARG Invalid argument.
440 * @retval SR_ERR Other error.
441 * @retval other The number of bytes read. If this is less than the number
442 * requested, the timeout was reached.
446 SR_PRIV int serial_read_blocking(struct sr_serial_dev_inst *serial,
447 void *buf, size_t count, unsigned int timeout_ms)
449 return _serial_read(serial, buf, count, 0, timeout_ms);
453 * Try to read up to @a count bytes from the specified serial port, return
454 * immediately with what's available.
456 * @param serial Previously initialized serial port structure.
457 * @param buf Buffer where to store the bytes that are read.
458 * @param[in] count The number of bytes to read.
460 * @retval SR_ERR_ARG Invalid argument.
461 * @retval SR_ERR Other error.
462 * @retval other The number of bytes read.
466 SR_PRIV int serial_read_nonblocking(struct sr_serial_dev_inst *serial,
467 void *buf, size_t count)
469 return _serial_read(serial, buf, count, 1, 0);
473 * Set serial parameters for the specified serial port.
475 * @param serial Previously initialized serial port structure.
476 * @param[in] baudrate The baudrate to set.
477 * @param[in] bits The number of data bits to use (5, 6, 7 or 8).
478 * @param[in] parity The parity setting to use (0 = none, 1 = even, 2 = odd).
479 * @param[in] stopbits The number of stop bits to use (1 or 2).
480 * @param[in] flowcontrol The flow control settings to use (0 = none,
481 * 1 = RTS/CTS, 2 = XON/XOFF).
482 * @param[in] rts Status of RTS line (0 or 1; required by some interfaces).
483 * @param[in] dtr Status of DTR line (0 or 1; required by some interfaces).
485 * @retval SR_OK Success.
486 * @retval SR_ERR Failure.
490 SR_PRIV int serial_set_params(struct sr_serial_dev_inst *serial,
491 int baudrate, int bits, int parity, int stopbits,
492 int flowcontrol, int rts, int dtr)
497 sr_dbg("Invalid serial port.");
501 sr_spew("Setting serial parameters on port %s.", serial->port);
503 if (!serial->lib_funcs || !serial->lib_funcs->set_params)
505 ret = serial->lib_funcs->set_params(serial,
506 baudrate, bits, parity, stopbits,
507 flowcontrol, rts, dtr);
509 serial->comm_params.bit_rate = baudrate;
510 serial->comm_params.data_bits = bits;
511 serial->comm_params.parity_bits = parity ? 1 : 0;
512 serial->comm_params.stop_bits = stopbits;
513 sr_dbg("DBG: %s() rate %d, %d%s%d", __func__,
515 (parity == 0) ? "n" : "x",
523 * Set serial parameters for the specified serial port from parameter string.
525 * @param serial Previously initialized serial port structure.
526 * @param[in] paramstr A serial communication parameters string of the form
527 * "<baudrate>/<bits><parity><stopbits>{/<option>}".\n
528 * Examples: "9600/8n1", "600/7o2/dtr=1/rts=0" or "460800/8n1/flow=2".\n
529 * \<baudrate\>=integer Baud rate.\n
530 * \<bits\>=5|6|7|8 Number of data bits.\n
531 * \<parity\>=n|e|o None, even, odd.\n
532 * \<stopbits\>=1|2 One or two stop bits.\n
534 * dtr=0|1 Set DTR off resp. on.\n
535 * flow=0|1|2 Flow control. 0 for none, 1 for RTS/CTS, 2 for XON/XOFF.\n
536 * rts=0|1 Set RTS off resp. on.\n
537 * Please note that values and combinations of these parameters must be
538 * supported by the concrete serial interface hardware and the drivers for it.
540 * @retval SR_OK Success.
541 * @retval SR_ERR Failure.
545 SR_PRIV int serial_set_paramstr(struct sr_serial_dev_inst *serial,
546 const char *paramstr)
549 #define SERIAL_COMM_SPEC "^(\\d+)/([5678])([neo])([12])(.*)$"
554 int speed, databits, parity, stopbits, flow, rts, dtr, i;
555 char *mstr, **opts, **kv;
557 speed = databits = parity = stopbits = flow = 0;
559 sr_spew("Parsing parameters from \"%s\".", paramstr);
560 reg = g_regex_new(SERIAL_COMM_SPEC, 0, 0, NULL);
561 if (g_regex_match(reg, paramstr, 0, &match)) {
562 if ((mstr = g_match_info_fetch(match, 1)))
563 speed = strtoul(mstr, NULL, 10);
565 if ((mstr = g_match_info_fetch(match, 2)))
566 databits = strtoul(mstr, NULL, 10);
568 if ((mstr = g_match_info_fetch(match, 3))) {
571 parity = SP_PARITY_NONE;
574 parity = SP_PARITY_EVEN;
577 parity = SP_PARITY_ODD;
582 if ((mstr = g_match_info_fetch(match, 4)))
583 stopbits = strtoul(mstr, NULL, 10);
585 if ((mstr = g_match_info_fetch(match, 5)) && mstr[0] != '\0') {
586 if (mstr[0] != '/') {
587 sr_dbg("missing separator before extra options");
590 /* A set of "key=value" options separated by / */
591 opts = g_strsplit(mstr + 1, "/", 0);
592 for (i = 0; opts[i]; i++) {
593 kv = g_strsplit(opts[i], "=", 2);
594 if (!strncmp(kv[0], "rts", 3)) {
597 else if (kv[1][0] == '0')
600 sr_dbg("invalid value for rts: %c", kv[1][0]);
603 } else if (!strncmp(kv[0], "dtr", 3)) {
606 else if (kv[1][0] == '0')
609 sr_dbg("invalid value for dtr: %c", kv[1][0]);
612 } else if (!strncmp(kv[0], "flow", 4)) {
615 else if (kv[1][0] == '1')
617 else if (kv[1][0] == '2')
620 sr_dbg("invalid value for flow: %c", kv[1][0]);
631 g_match_info_unref(match);
635 return serial_set_params(serial, speed, databits, parity,
636 stopbits, flow, rts, dtr);
638 sr_dbg("Could not infer speed from parameter string.");
644 * Read a line from the specified serial port.
646 * @param[in] serial Previously initialized serial port structure.
647 * @param[out] buf Buffer where to store the bytes that are read.
648 * @param[in] buflen Size of the buffer.
649 * @param[in] timeout_ms How long to wait for a line to come in.
651 * Reading stops when CR or LF is found, which is stripped from the buffer.
653 * @retval SR_OK Success.
654 * @retval SR_ERR Failure.
658 SR_PRIV int serial_readline(struct sr_serial_dev_inst *serial,
659 char **buf, int *buflen, gint64 timeout_ms)
661 gint64 start, remaining;
665 sr_dbg("Invalid serial port.");
669 if (!dev_is_supported(serial)) {
670 sr_dbg("Cannot use unopened serial port %s.", serial->port);
674 start = g_get_monotonic_time();
675 remaining = timeout_ms;
680 len = maxlen - *buflen - 1;
683 len = serial_read_blocking(serial, *buf + *buflen, 1, remaining);
686 *(*buf + *buflen) = '\0';
687 if (*buflen > 0 && (*(*buf + *buflen - 1) == '\r'
688 || *(*buf + *buflen - 1) == '\n')) {
689 /* Strip CR/LF and terminate. */
690 *(*buf + --*buflen) = '\0';
694 /* Reduce timeout by time elapsed. */
695 remaining = timeout_ms - ((g_get_monotonic_time() - start) / 1000);
703 sr_dbg("Received %d: '%s'.", *buflen, *buf);
709 * Try to find a valid packet in a serial data stream.
711 * @param serial Previously initialized serial port structure.
712 * @param buf Buffer containing the bytes to write.
713 * @param buflen Size of the buffer.
714 * @param[in] packet_size Size, in bytes, of a valid packet.
715 * @param is_valid Callback that assesses whether the packet is valid or not.
716 * @param[in] timeout_ms The timeout after which, if no packet is detected, to
718 * @param[in] baudrate The baudrate of the serial port. This parameter is not
719 * critical, but it helps fine tune the serial port polling
722 * @retval SR_OK Valid packet was found within the given timeout.
723 * @retval SR_ERR Failure.
727 SR_PRIV int serial_stream_detect(struct sr_serial_dev_inst *serial,
728 uint8_t *buf, size_t *buflen,
730 packet_valid_callback is_valid,
731 uint64_t timeout_ms, int baudrate)
733 uint64_t start, time, byte_delay_us;
734 size_t ibuf, i, maxlen;
739 sr_dbg("Detecting packets on %s (timeout = %" PRIu64
740 "ms, baudrate = %d).", serial->port, timeout_ms, baudrate);
742 if (maxlen < (packet_size / 2) ) {
743 sr_err("Buffer size must be at least twice the packet size.");
747 /* Assume 8n1 transmission. That is 10 bits for every byte. */
748 byte_delay_us = 10 * ((1000 * 1000) / baudrate);
749 start = g_get_monotonic_time();
752 while (ibuf < maxlen) {
753 len = serial_read_nonblocking(serial, &buf[ibuf], 1);
756 } else if (len == 0) {
757 /* No logging, already done in serial_read(). */
759 /* Error reading byte, but continuing anyway. */
762 time = g_get_monotonic_time() - start;
765 if ((ibuf - i) >= packet_size) {
767 /* We have at least a packet's worth of data. */
768 text = sr_hexdump_new(&buf[i], packet_size);
769 sr_spew("Trying packet: %s", text->str);
770 sr_hexdump_free(text);
771 if (is_valid(&buf[i])) {
772 sr_spew("Found valid %zu-byte packet after "
773 "%" PRIu64 "ms.", (ibuf - i), time);
777 sr_spew("Got %zu bytes, but not a valid "
778 "packet.", (ibuf - i));
780 /* Not a valid packet. Continue searching. */
783 if (time >= timeout_ms) {
785 sr_dbg("Detection timed out after %" PRIu64 "ms.", time);
789 g_usleep(byte_delay_us);
794 sr_err("Didn't find a valid packet (read %zu bytes).", *buflen);
800 * Extract the serial device and options from the options linked list.
802 * @param options List of options passed from the command line.
803 * @param serial_device Pointer where to store the extracted serial device.
804 * @param serial_options Pointer where to store the optional extracted serial
807 * @return SR_OK if a serial_device is found, SR_ERR if no device is found. The
808 * returned string should not be freed by the caller.
812 SR_PRIV int sr_serial_extract_options(GSList *options,
813 const char **serial_device, const char **serial_options)
816 struct sr_config *src;
818 *serial_device = NULL;
820 for (l = options; l; l = l->next) {
824 *serial_device = g_variant_get_string(src->data, NULL);
825 sr_dbg("Parsed serial device: %s.", *serial_device);
827 case SR_CONF_SERIALCOMM:
828 *serial_options = g_variant_get_string(src->data, NULL);
829 sr_dbg("Parsed serial options: %s.", *serial_options);
834 if (!*serial_device) {
835 sr_dbg("No serial device specified.");
843 SR_PRIV int serial_source_add(struct sr_session *session,
844 struct sr_serial_dev_inst *serial, int events, int timeout,
845 sr_receive_data_callback cb, void *cb_data)
847 if ((events & (G_IO_IN | G_IO_ERR)) && (events & G_IO_OUT)) {
848 sr_err("Cannot poll input/error and output simultaneously.");
852 if (!dev_is_supported(serial)) {
853 sr_err("Invalid serial port.");
857 if (!serial->lib_funcs || !serial->lib_funcs->setup_source_add)
860 return serial->lib_funcs->setup_source_add(session, serial,
861 events, timeout, cb, cb_data);
865 SR_PRIV int serial_source_remove(struct sr_session *session,
866 struct sr_serial_dev_inst *serial)
868 if (!dev_is_supported(serial)) {
869 sr_err("Invalid serial port.");
873 if (!serial->lib_funcs || !serial->lib_funcs->setup_source_remove)
876 return serial->lib_funcs->setup_source_remove(session, serial);
880 * Create/allocate a new sr_serial_port structure.
882 * @param name The OS dependent name of the serial port. Must not be NULL.
883 * @param description An end user friendly description for the serial port.
884 * Can be NULL (in that case the empty string is used
887 * @return The newly allocated sr_serial_port struct.
889 static struct sr_serial_port *sr_serial_new(const char *name,
890 const char *description)
892 struct sr_serial_port *serial;
897 serial = g_malloc0(sizeof(*serial));
898 serial->name = g_strdup(name);
899 serial->description = g_strdup(description ? description : "");
905 * Free a previously allocated sr_serial_port structure.
907 * @param serial The sr_serial_port struct to free. Must not be NULL.
909 SR_API void sr_serial_free(struct sr_serial_port *serial)
913 g_free(serial->name);
914 g_free(serial->description);
918 static GSList *append_port_list(GSList *devs, const char *name, const char *desc)
920 return g_slist_append(devs, sr_serial_new(name, desc));
924 * List available serial devices.
926 * @return A GSList of strings containing the path of the serial devices or
927 * NULL if no serial device is found. The returned list must be freed
930 SR_API GSList *sr_serial_list(const struct sr_dev_driver *driver)
933 GSList *(*list_func)(GSList *list, sr_ser_list_append_t append);
935 /* Currently unused, but will be used by some drivers later on. */
939 if (ser_lib_funcs_libsp && ser_lib_funcs_libsp->list) {
940 list_func = ser_lib_funcs_libsp->list;
941 tty_devs = list_func(tty_devs, append_port_list);
943 if (ser_lib_funcs_hid && ser_lib_funcs_hid->list) {
944 list_func = ser_lib_funcs_hid->list;
945 tty_devs = list_func(tty_devs, append_port_list);
947 if (ser_lib_funcs_bt && ser_lib_funcs_bt->list) {
948 list_func = ser_lib_funcs_bt->list;
949 tty_devs = list_func(tty_devs, append_port_list);
955 static GSList *append_port_find(GSList *devs, const char *name)
960 return g_slist_append(devs, g_strdup(name));
964 * Find USB serial devices via the USB vendor ID and product ID.
966 * @param[in] vendor_id Vendor ID of the USB device.
967 * @param[in] product_id Product ID of the USB device.
969 * @return A GSList of strings containing the path of the serial device or
970 * NULL if no serial device is found. The returned list must be freed
975 SR_PRIV GSList *sr_serial_find_usb(uint16_t vendor_id, uint16_t product_id)
978 GSList *(*find_func)(GSList *list, sr_ser_find_append_t append,
979 uint16_t vid, uint16_t pid);
982 if (ser_lib_funcs_libsp && ser_lib_funcs_libsp->find_usb) {
983 find_func = ser_lib_funcs_libsp->find_usb;
984 tty_devs = find_func(tty_devs, append_port_find,
985 vendor_id, product_id);
987 if (ser_lib_funcs_hid && ser_lib_funcs_hid->find_usb) {
988 find_func = ser_lib_funcs_hid->find_usb;
989 tty_devs = find_func(tty_devs, append_port_find,
990 vendor_id, product_id);
997 SR_PRIV int serial_timeout(struct sr_serial_dev_inst *port, int num_bytes)
1003 /* Get the bitrate and frame length. */
1005 if (port->lib_funcs && port->lib_funcs->get_frame_format) {
1006 ret = port->lib_funcs->get_frame_format(port, &baud, &bits);
1010 baud = port->comm_params.bit_rate;
1011 bits = 1 + port->comm_params.data_bits +
1012 port->comm_params.parity_bits +
1013 port->comm_params.stop_bits;
1016 /* Derive the timeout. Default to 1s. */
1019 /* Throw in 10ms for misc OS overhead. */
1021 timeout_ms += ((1000.0 / baud) * bits) * num_bytes;
1029 /* TODO Put fallback.c content here? */