+++ /dev/null
-/*
- * This file is part of the libsigrok project.
- *
- * Copyright (C) 2010-2012 Bert Vermeulen <bert@biot.com>
- * Copyright (C) 2010-2012 Uwe Hermann <uwe@hermann-uwe.de>
- * Copyright (C) 2012 Alexandru Gagniuc <mr.nuke.me@gmail.com>
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-#include <string.h>
-#include <stdlib.h>
-#include <glib.h>
-#include <glib/gstdio.h>
-#include <libserialport.h>
-#include "libsigrok.h"
-#include "libsigrok-internal.h"
-
-#define LOG_PREFIX "serial"
-
-/**
- * Open the specified serial port.
- *
- * @param serial Previously initialized serial port structure.
- * @param[in] flags Flags to use when opening the serial port. Possible flags
- * include SERIAL_RDWR, SERIAL_RDONLY, SERIAL_NONBLOCK.
- *
- * If the serial structure contains a serialcomm string, it will be
- * passed to serial_set_paramstr() after the port is opened.
- *
- * @retval SR_OK Success.
- * @retval SR_ERR Failure.
- */
-SR_PRIV int serial_open(struct sr_serial_dev_inst *serial, int flags)
-{
- int ret;
- char *error;
- int sp_flags = 0;
-
- if (!serial) {
- sr_dbg("Invalid serial port.");
- return SR_ERR;
- }
-
- sr_spew("Opening serial port '%s' (flags %d).", serial->port, flags);
-
- sp_get_port_by_name(serial->port, &serial->data);
-
- if (flags & SERIAL_RDWR)
- sp_flags = (SP_MODE_READ | SP_MODE_WRITE);
- else if (flags & SERIAL_RDONLY)
- sp_flags = SP_MODE_READ;
-
- serial->nonblocking = (flags & SERIAL_NONBLOCK) ? 1 : 0;
-
- ret = sp_open(serial->data, sp_flags);
-
- switch (ret) {
- case SP_ERR_ARG:
- sr_err("Attempt to open serial port with invalid parameters.");
- return SR_ERR_ARG;
- case SP_ERR_FAIL:
- error = sp_last_error_message();
- sr_err("Error opening port (%d): %s.",
- sp_last_error_code(), error);
- sp_free_error_message(error);
- return SR_ERR;
- }
-
- if (serial->serialcomm)
- return serial_set_paramstr(serial, serial->serialcomm);
- else
- return SR_OK;
-}
-
-/**
- * Close the specified serial port.
- *
- * @param serial Previously initialized serial port structure.
- *
- * @retval SR_OK Success.
- * @retval SR_ERR Failure.
- */
-SR_PRIV int serial_close(struct sr_serial_dev_inst *serial)
-{
- int ret;
- char *error;
-
- if (!serial) {
- sr_dbg("Invalid serial port.");
- return SR_ERR;
- }
-
- if (!serial->data) {
- sr_dbg("Cannot close unopened serial port %s.", serial->port);
- return SR_ERR;
- }
-
- sr_spew("Closing serial port %s.", serial->port);
-
- ret = sp_close(serial->data);
-
- switch (ret) {
- case SP_ERR_ARG:
- sr_err("Attempt to close an invalid serial port.");
- return SR_ERR_ARG;
- case SP_ERR_FAIL:
- error = sp_last_error_message();
- sr_err("Error closing port (%d): %s.",
- sp_last_error_code(), error);
- sp_free_error_message(error);
- return SR_ERR;
- }
-
- sp_free_port(serial->data);
- serial->data = NULL;
-
- return SR_OK;
-}
-
-/**
- * Flush serial port buffers.
- *
- * @param serial Previously initialized serial port structure.
- *
- * @retval SR_OK Success.
- * @retval SR_ERR Failure.
- */
-SR_PRIV int serial_flush(struct sr_serial_dev_inst *serial)
-{
- int ret;
- char *error;
-
- if (!serial) {
- sr_dbg("Invalid serial port.");
- return SR_ERR;
- }
-
- if (!serial->data) {
- sr_dbg("Cannot flush unopened serial port %s.", serial->port);
- return SR_ERR;
- }
-
- sr_spew("Flushing serial port %s.", serial->port);
-
- ret = sp_flush(serial->data, SP_BUF_BOTH);
-
- switch (ret) {
- case SP_ERR_ARG:
- sr_err("Attempt to flush an invalid serial port.");
- return SR_ERR_ARG;
- case SP_ERR_FAIL:
- error = sp_last_error_message();
- sr_err("Error flushing port (%d): %s.",
- sp_last_error_code(), error);
- sp_free_error_message(error);
- return SR_ERR;
- }
-
- return SR_OK;
-}
-
-static int _serial_write(struct sr_serial_dev_inst *serial,
- const void *buf, size_t count, int nonblocking)
-{
- ssize_t ret;
- char *error;
-
- if (!serial) {
- sr_dbg("Invalid serial port.");
- return SR_ERR;
- }
-
- if (!serial->data) {
- sr_dbg("Cannot use unopened serial port %s.", serial->port);
- return SR_ERR;
- }
-
- if (nonblocking)
- ret = sp_nonblocking_write(serial->data, buf, count);
- else
- ret = sp_blocking_write(serial->data, buf, count, 0);
-
- switch (ret) {
- case SP_ERR_ARG:
- sr_err("Attempted serial port write with invalid arguments.");
- return SR_ERR_ARG;
- case SP_ERR_FAIL:
- error = sp_last_error_message();
- sr_err("Write error (%d): %s.", sp_last_error_code(), error);
- sp_free_error_message(error);
- return SR_ERR;
- }
-
- sr_spew("Wrote %d/%d bytes.", ret, count);
-
- return ret;
-}
-
-/**
- * Write a number of bytes to the specified serial port.
- *
- * @param serial Previously initialized serial port structure.
- * @param[in] buf Buffer containing the bytes to write.
- * @param[in] count Number of bytes to write.
- *
- * @retval SR_ERR_ARG Invalid argument.
- * @retval SR_ERR Other error.
- * @retval other The number of bytes written.
- */
-SR_PRIV int serial_write(struct sr_serial_dev_inst *serial,
- const void *buf, size_t count)
-{
- return _serial_write(serial, buf, count, serial->nonblocking);
-}
-
-/**
- * Write a number of bytes to the specified serial port, blocking until finished.
- * @copydetails serial_write()
- */
-SR_PRIV int serial_write_blocking(struct sr_serial_dev_inst *serial,
- const void *buf, size_t count)
-{
- return _serial_write(serial, buf, count, 0);
-}
-
-/**
- * Write a number of bytes to the specified serial port, return immediately.
- * @copydetails serial_write()
-*/
-SR_PRIV int serial_write_nonblocking(struct sr_serial_dev_inst *serial,
- const void *buf, size_t count)
-{
- return _serial_write(serial, buf, count, 1);
-}
-
-static int _serial_read(struct sr_serial_dev_inst *serial, void *buf,
- size_t count, int nonblocking)
-{
- ssize_t ret;
- char *error;
-
- if (!serial) {
- sr_dbg("Invalid serial port.");
- return SR_ERR;
- }
-
- if (!serial->data) {
- sr_dbg("Cannot use unopened serial port %s.", serial->port);
- return SR_ERR;
- }
-
- if (nonblocking)
- ret = sp_nonblocking_read(serial->data, buf, count);
- else
- ret = sp_blocking_read(serial->data, buf, count, 0);
-
- switch (ret) {
- case SP_ERR_ARG:
- sr_err("Attempted serial port read with invalid arguments.");
- return SR_ERR_ARG;
- case SP_ERR_FAIL:
- error = sp_last_error_message();
- sr_err("Read error (%d): %s.", sp_last_error_code(), error);
- sp_free_error_message(error);
- return SR_ERR;
- }
-
- if (ret > 0)
- sr_spew("Read %d/%d bytes.", ret, count);
-
- return ret;
-}
-
-/**
- * Read a number of bytes from the specified serial port.
- *
- * @param serial Previously initialized serial port structure.
- * @param buf Buffer where to store the bytes that are read.
- * @param[in] count The number of bytes to read.
- *
- * @retval SR_ERR_ARG Invalid argument.
- * @retval SR_ERR Other error.
- * @retval other The number of bytes read.
- */
-SR_PRIV int serial_read(struct sr_serial_dev_inst *serial, void *buf,
- size_t count)
-{
- return _serial_read(serial, buf, count, serial->nonblocking);
-}
-
-/**
- * Read a number of bytes from the specified serial port, block until finished.
- * @copydetails serial_read()
- */
-SR_PRIV int serial_read_blocking(struct sr_serial_dev_inst *serial, void *buf,
- size_t count)
-{
- return _serial_read(serial, buf, count, 0);
-}
-
-/**
- * Try to read up to @a count bytes from the specified serial port, return
- * immediately with what's available.
- * @copydetails serial_read()
- */
-SR_PRIV int serial_read_nonblocking(struct sr_serial_dev_inst *serial, void *buf,
- size_t count)
-{
- return _serial_read(serial, buf, count, 1);
-}
-
-/**
- * Set serial parameters for the specified serial port.
- *
- * @param serial Previously initialized serial port structure.
- * @param[in] baudrate The baudrate to set.
- * @param[in] bits The number of data bits to use (5, 6, 7 or 8).
- * @param[in] parity The parity setting to use (0 = none, 1 = even, 2 = odd).
- * @param[in] stopbits The number of stop bits to use (1 or 2).
- * @param[in] flowcontrol The flow control settings to use (0 = none,
- * 1 = RTS/CTS, 2 = XON/XOFF).
- * @param[in] rts Status of RTS line (0 or 1; required by some interfaces).
- * @param[in] dtr Status of DTR line (0 or 1; required by some interfaces).
- *
- * @retval SR_OK Success.
- * @retval SR_ERR Failure.
- */
-SR_PRIV int serial_set_params(struct sr_serial_dev_inst *serial, int baudrate,
- int bits, int parity, int stopbits,
- int flowcontrol, int rts, int dtr)
-{
- int ret;
- char *error;
- struct sp_port_config *config;
-
- if (!serial) {
- sr_dbg("Invalid serial port.");
- return SR_ERR;
- }
-
- if (!serial->data) {
- sr_dbg("Cannot configure unopened serial port %s.", serial->port);
- return SR_ERR;
- }
-
- sr_spew("Setting serial parameters on port %s.", serial->port);
-
- sp_new_config(&config);
- sp_set_config_baudrate(config, baudrate);
- sp_set_config_bits(config, bits);
- switch (parity) {
- case 0:
- sp_set_config_parity(config, SP_PARITY_NONE);
- break;
- case 1:
- sp_set_config_parity(config, SP_PARITY_EVEN);
- break;
- case 2:
- sp_set_config_parity(config, SP_PARITY_ODD);
- break;
- default:
- return SR_ERR_ARG;
- }
- sp_set_config_stopbits(config, stopbits);
- sp_set_config_rts(config, flowcontrol == 1 ? SP_RTS_FLOW_CONTROL : rts);
- sp_set_config_cts(config, flowcontrol == 1 ? SP_CTS_FLOW_CONTROL : SP_CTS_IGNORE);
- sp_set_config_dtr(config, dtr);
- sp_set_config_dsr(config, SP_DSR_IGNORE);
- sp_set_config_xon_xoff(config, flowcontrol == 2 ? SP_XONXOFF_INOUT : SP_XONXOFF_DISABLED);
-
- ret = sp_set_config(serial->data, config);
- sp_free_config(config);
-
- switch (ret) {
- case SP_ERR_ARG:
- sr_err("Invalid arguments for setting serial port parameters.");
- return SR_ERR_ARG;
- case SP_ERR_FAIL:
- error = sp_last_error_message();
- sr_err("Error setting serial port parameters (%d): %s.",
- sp_last_error_code(), error);
- sp_free_error_message(error);
- return SR_ERR;
- }
-
- return SR_OK;
-}
-
-/**
- * Set serial parameters for the specified serial port from parameter string.
- *
- * @param serial Previously initialized serial port structure.
- * @param[in] paramstr A serial communication parameters string of the form
- * "<baudrate>/<bits><parity><stopbits>{/<option>}".\n
- * Examples: "9600/8n1", "600/7o2/dtr=1/rts=0" or "460800/8n1/flow=2".\n
- * \<baudrate\>=integer Baud rate.\n
- * \<bits\>=5|6|7|8 Number of data bits.\n
- * \<parity\>=n|e|o None, even, odd.\n
- * \<stopbits\>=1|2 One or two stop bits.\n
- * Options:\n
- * dtr=0|1 Set DTR off resp. on.\n
- * flow=0|1|2 Flow control. 0 for none, 1 for RTS/CTS, 2 for XON/XOFF.\n
- * rts=0|1 Set RTS off resp. on.\n
- * Please note that values and combinations of these parameters must be
- * supported by the concrete serial interface hardware and the drivers for it.
- * @retval SR_OK Success.
- * @retval SR_ERR Failure.
- */
-SR_PRIV int serial_set_paramstr(struct sr_serial_dev_inst *serial,
- const char *paramstr)
-{
-#define SERIAL_COMM_SPEC "^(\\d+)/([5678])([neo])([12])(.*)$"
-
- GRegex *reg;
- GMatchInfo *match;
- int speed, databits, parity, stopbits, flow, rts, dtr, i;
- char *mstr, **opts, **kv;
-
- speed = databits = parity = stopbits = flow = 0;
- rts = dtr = -1;
- sr_spew("Parsing parameters from \"%s\".", paramstr);
- reg = g_regex_new(SERIAL_COMM_SPEC, 0, 0, NULL);
- if (g_regex_match(reg, paramstr, 0, &match)) {
- if ((mstr = g_match_info_fetch(match, 1)))
- speed = strtoul(mstr, NULL, 10);
- g_free(mstr);
- if ((mstr = g_match_info_fetch(match, 2)))
- databits = strtoul(mstr, NULL, 10);
- g_free(mstr);
- if ((mstr = g_match_info_fetch(match, 3))) {
- switch (mstr[0]) {
- case 'n':
- parity = SERIAL_PARITY_NONE;
- break;
- case 'e':
- parity = SERIAL_PARITY_EVEN;
- break;
- case 'o':
- parity = SERIAL_PARITY_ODD;
- break;
- }
- }
- g_free(mstr);
- if ((mstr = g_match_info_fetch(match, 4)))
- stopbits = strtoul(mstr, NULL, 10);
- g_free(mstr);
- if ((mstr = g_match_info_fetch(match, 5)) && mstr[0] != '\0') {
- if (mstr[0] != '/') {
- sr_dbg("missing separator before extra options");
- speed = 0;
- } else {
- /* A set of "key=value" options separated by / */
- opts = g_strsplit(mstr + 1, "/", 0);
- for (i = 0; opts[i]; i++) {
- kv = g_strsplit(opts[i], "=", 2);
- if (!strncmp(kv[0], "rts", 3)) {
- if (kv[1][0] == '1')
- rts = 1;
- else if (kv[1][0] == '0')
- rts = 0;
- else {
- sr_dbg("invalid value for rts: %c", kv[1][0]);
- speed = 0;
- }
- } else if (!strncmp(kv[0], "dtr", 3)) {
- if (kv[1][0] == '1')
- dtr = 1;
- else if (kv[1][0] == '0')
- dtr = 0;
- else {
- sr_dbg("invalid value for dtr: %c", kv[1][0]);
- speed = 0;
- }
- } else if (!strncmp(kv[0], "flow", 4)) {
- if (kv[1][0] == '0')
- flow = 0;
- else if (kv[1][0] == '1')
- flow = 1;
- else if (kv[1][0] == '2')
- flow = 2;
- else {
- sr_dbg("invalid value for flow: %c", kv[1][0]);
- speed = 0;
- }
- }
- g_strfreev(kv);
- }
- g_strfreev(opts);
- }
- }
- g_free(mstr);
- }
- g_match_info_unref(match);
- g_regex_unref(reg);
-
- if (speed) {
- return serial_set_params(serial, speed, databits, parity,
- stopbits, flow, rts, dtr);
- } else {
- sr_dbg("Could not infer speed from parameter string.");
- return SR_ERR_ARG;
- }
-}
-
-/**
- * Read a line from the specified serial port.
- *
- * @param serial Previously initialized serial port structure.
- * @param buf Buffer where to store the bytes that are read.
- * @param buflen Size of the buffer.
- * @param[in] timeout_ms How long to wait for a line to come in.
- *
- * Reading stops when CR of LR is found, which is stripped from the buffer.
- *
- * @retval SR_OK Success.
- * @retval SR_ERR Failure.
- */
-SR_PRIV int serial_readline(struct sr_serial_dev_inst *serial, char **buf,
- int *buflen, gint64 timeout_ms)
-{
- gint64 start;
- int maxlen, len;
-
- if (!serial) {
- sr_dbg("Invalid serial port.");
- return SR_ERR;
- }
-
- if (!serial->data) {
- sr_dbg("Cannot use unopened serial port %s.", serial->port);
- return -1;
- }
-
- timeout_ms *= 1000;
- start = g_get_monotonic_time();
-
- maxlen = *buflen;
- *buflen = len = 0;
- while(1) {
- len = maxlen - *buflen - 1;
- if (len < 1)
- break;
- len = serial_read(serial, *buf + *buflen, 1);
- if (len > 0) {
- *buflen += len;
- *(*buf + *buflen) = '\0';
- if (*buflen > 0 && (*(*buf + *buflen - 1) == '\r'
- || *(*buf + *buflen - 1) == '\n')) {
- /* Strip CR/LF and terminate. */
- *(*buf + --*buflen) = '\0';
- break;
- }
- }
- if (g_get_monotonic_time() - start > timeout_ms)
- /* Timeout */
- break;
- if (len < 1)
- g_usleep(2000);
- }
- if (*buflen)
- sr_dbg("Received %d: '%s'.", *buflen, *buf);
-
- return SR_OK;
-}
-
-/**
- * Try to find a valid packet in a serial data stream.
- *
- * @param serial Previously initialized serial port structure.
- * @param buf Buffer containing the bytes to write.
- * @param buflen Size of the buffer.
- * @param[in] packet_size Size, in bytes, of a valid packet.
- * @param is_valid Callback that assesses whether the packet is valid or not.
- * @param[in] timeout_ms The timeout after which, if no packet is detected, to
- * abort scanning.
- * @param[in] baudrate The baudrate of the serial port. This parameter is not
- * critical, but it helps fine tune the serial port polling
- * delay.
- *
- * @retval SR_OK Valid packet was found within the given timeout.
- * @retval SR_ERR Failure.
- */
-SR_PRIV int serial_stream_detect(struct sr_serial_dev_inst *serial,
- uint8_t *buf, size_t *buflen,
- size_t packet_size,
- packet_valid_callback is_valid,
- uint64_t timeout_ms, int baudrate)
-{
- uint64_t start, time, byte_delay_us;
- size_t ibuf, i, maxlen;
- int len;
-
- maxlen = *buflen;
-
- sr_dbg("Detecting packets on %s (timeout = %" PRIu64
- "ms, baudrate = %d).", serial->port, timeout_ms, baudrate);
-
- if (maxlen < (packet_size / 2) ) {
- sr_err("Buffer size must be at least twice the packet size.");
- return SR_ERR;
- }
-
- /* Assume 8n1 transmission. That is 10 bits for every byte. */
- byte_delay_us = 10 * (1000000 / baudrate);
- start = g_get_monotonic_time();
-
- i = ibuf = len = 0;
- while (ibuf < maxlen) {
- len = serial_read(serial, &buf[ibuf], 1);
- if (len > 0) {
- ibuf += len;
- } else if (len == 0) {
- /* No logging, already done in serial_read(). */
- } else {
- /* Error reading byte, but continuing anyway. */
- }
-
- time = g_get_monotonic_time() - start;
- time /= 1000;
-
- if ((ibuf - i) >= packet_size) {
- /* We have at least a packet's worth of data. */
- if (is_valid(&buf[i])) {
- sr_spew("Found valid %d-byte packet after "
- "%" PRIu64 "ms.", (ibuf - i), time);
- *buflen = ibuf;
- return SR_OK;
- } else {
- sr_spew("Got %d bytes, but not a valid "
- "packet.", (ibuf - i));
- }
- /* Not a valid packet. Continue searching. */
- i++;
- }
- if (time >= timeout_ms) {
- /* Timeout */
- sr_dbg("Detection timed out after %dms.", time);
- break;
- }
- if (len < 1)
- g_usleep(byte_delay_us);
- }
-
- *buflen = ibuf;
-
- sr_err("Didn't find a valid packet (read %d bytes).", *buflen);
-
- return SR_ERR;
-}
-
-/**
- * Extract the serial device and options from the options linked list.
- *
- * @param options List of options passed from the command line.
- * @param serial_device Pointer where to store the exctracted serial device.
- * @param serial_options Pointer where to store the optional extracted serial
- * options.
- *
- * @return SR_OK if a serial_device is found, SR_ERR if no device is found. The
- * returned string should not be freed by the caller.
- */
-SR_PRIV int sr_serial_extract_options(GSList *options, const char **serial_device,
- const char **serial_options)
-{
- GSList *l;
- struct sr_config *src;
-
- *serial_device = NULL;
-
- for (l = options; l; l = l->next) {
- src = l->data;
- switch (src->key) {
- case SR_CONF_CONN:
- *serial_device = g_variant_get_string(src->data, NULL);
- sr_dbg("Parsed serial device: %s", *serial_device);
- break;
-
- case SR_CONF_SERIALCOMM:
- *serial_options = g_variant_get_string(src->data, NULL);
- sr_dbg("Parsed serial options: %s", *serial_options);
- break;
- }
- }
-
- if (!*serial_device) {
- sr_dbg("No serial device specified");
- return SR_ERR;
- }
-
- return SR_OK;
-}
-
-#ifdef _WIN32
-typedef HANDLE event_handle;
-#else
-typedef int event_handle;
-#endif
-
-SR_PRIV int serial_source_add(struct sr_session *session,
- struct sr_serial_dev_inst *serial, int events, int timeout,
- sr_receive_data_callback cb, void *cb_data)
-{
- enum sp_event mask = 0;
- unsigned int i;
-
- if (sp_new_event_set(&serial->event_set) != SP_OK)
- return SR_ERR;
-
- if (events & G_IO_IN)
- mask |= SP_EVENT_RX_READY;
- if (events & G_IO_OUT)
- mask |= SP_EVENT_TX_READY;
- if (events & G_IO_ERR)
- mask |= SP_EVENT_ERROR;
-
- if (sp_add_port_events(serial->event_set, serial->data, mask) != SP_OK) {
- sp_free_event_set(serial->event_set);
- return SR_ERR;
- }
-
- serial->pollfds = (GPollFD *) g_malloc0(sizeof(GPollFD) * serial->event_set->count);
-
- for (i = 0; i < serial->event_set->count; i++) {
-
- serial->pollfds[i].fd = ((event_handle *) serial->event_set->handles)[i];
-
- mask = serial->event_set->masks[i];
-
- if (mask & SP_EVENT_RX_READY)
- serial->pollfds[i].events |= G_IO_IN;
- if (mask & SP_EVENT_TX_READY)
- serial->pollfds[i].events |= G_IO_OUT;
- if (mask & SP_EVENT_ERROR)
- serial->pollfds[i].events |= G_IO_ERR;
-
- if (sr_session_source_add_pollfd(session, &serial->pollfds[i],
- timeout, cb, cb_data) != SR_OK)
- return SR_ERR;
- }
-
- return SR_OK;
-}
-
-SR_PRIV int serial_source_remove(struct sr_session *session,
- struct sr_serial_dev_inst *serial)
-{
- unsigned int i;
-
- for (i = 0; i < serial->event_set->count; i++)
- if (sr_session_source_remove_pollfd(session, &serial->pollfds[i]) != SR_OK)
- return SR_ERR;
-
- g_free(serial->pollfds);
- sp_free_event_set(serial->event_set);
-
- serial->pollfds = NULL;
- serial->event_set = NULL;
-
- return SR_OK;
-}
-
-/**
- * Find USB serial devices via the USB vendor ID and product ID.
- *
- * @param[in] vendor_id Vendor ID of the USB device.
- * @param[in] product_id Product ID of the USB device.
- *
- * @return A GSList of strings containing the path of the serial device or
- * NULL if no serial device is found. The returned list must be freed
- * by the caller.
- */
-SR_PRIV GSList *sr_serial_find_usb(uint16_t vendor_id, uint16_t product_id)
-{
-#ifdef __linux__
- const gchar *usb_dev;
- const char device_tree[] = "/sys/bus/usb/devices/";
- GDir *devices_dir, *device_dir;
- GSList *l = NULL;
- GSList *tty_devs;
- GSList *matched_paths;
- FILE *fd;
- char tmp[5];
- gchar *vendor_path, *product_path, *path_copy;
- gchar *prefix, *subdir_path, *device_path, *tty_path;
- unsigned long read_vendor_id, read_product_id;
- const char *file;
-
- l = NULL;
- tty_devs = NULL;
- matched_paths = NULL;
-
- if (!(devices_dir = g_dir_open(device_tree, 0, NULL)))
- return NULL;
-
- /*
- * Find potential candidates using the vendor ID and product ID
- * and store them in matched_paths.
- */
- while ((usb_dev = g_dir_read_name(devices_dir))) {
- vendor_path = g_strconcat(device_tree,
- usb_dev, "/idVendor", NULL);
- product_path = g_strconcat(device_tree,
- usb_dev, "/idProduct", NULL);
-
- if (!g_file_test(vendor_path, G_FILE_TEST_EXISTS) ||
- !g_file_test(product_path, G_FILE_TEST_EXISTS))
- goto skip_device;
-
- if ((fd = g_fopen(vendor_path, "r")) == NULL)
- goto skip_device;
-
- if (fgets(tmp, sizeof(tmp), fd) == NULL) {
- fclose(fd);
- goto skip_device;
- }
- read_vendor_id = strtoul(tmp, NULL, 16);
-
- fclose(fd);
-
- if ((fd = g_fopen(product_path, "r")) == NULL)
- goto skip_device;
-
- if (fgets(tmp, sizeof(tmp), fd) == NULL) {
- fclose(fd);
- goto skip_device;
- }
- read_product_id = strtoul(tmp, NULL, 16);
-
- fclose(fd);
-
- if (vendor_id == read_vendor_id &&
- product_id == read_product_id) {
- path_copy = g_strdup(usb_dev);
- matched_paths = g_slist_prepend(matched_paths,
- path_copy);
- }
-
-skip_device:
- g_free(vendor_path);
- g_free(product_path);
- }
- g_dir_close(devices_dir);
-
- /* For every matched device try to find a ttyUSBX subfolder. */
- for (l = matched_paths; l; l = l->next) {
- subdir_path = NULL;
-
- device_path = g_strconcat(device_tree, l->data, NULL);
-
- if (!(device_dir = g_dir_open(device_path, 0, NULL))) {
- g_free(device_path);
- continue;
- }
-
- prefix = g_strconcat(l->data, ":", NULL);
-
- while ((file = g_dir_read_name(device_dir))) {
- if (g_str_has_prefix(file, prefix)) {
- subdir_path = g_strconcat(device_path,
- "/", file, NULL);
- break;
- }
- }
- g_dir_close(device_dir);
-
- g_free(prefix);
- g_free(device_path);
-
- if (subdir_path) {
- if (!(device_dir = g_dir_open(subdir_path, 0, NULL))) {
- g_free(subdir_path);
- continue;
- }
- g_free(subdir_path);
-
- while ((file = g_dir_read_name(device_dir))) {
- if (g_str_has_prefix(file, "ttyUSB")) {
- tty_path = g_strconcat("/dev/",
- file, NULL);
- sr_dbg("Found USB device %04x:%04x attached to %s.",
- vendor_id, product_id, tty_path);
- tty_devs = g_slist_prepend(tty_devs,
- tty_path);
- break;
- }
- }
- g_dir_close(device_dir);
- }
- }
- g_slist_free_full(matched_paths, g_free);
-
- return tty_devs;
-#else
- (void)vendor_id;
- (void)product_id;
-
- return NULL;
-#endif
-}
projects / libsigrok.git / blobdiff