#include <string.h>
#include <stdlib.h>
#include <glib.h>
+#include <glib/gstdio.h>
#include <libserialport.h>
#include "libsigrok.h"
#include "libsigrok-internal.h"
* Open the specified serial port.
*
* @param serial Previously initialized serial port structure.
- * @param flags Flags to use when opening the serial port. Possible flags
+ * @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.
*
- * @return SR_OK on success, SR_ERR on failure.
+ * @retval SR_OK Success.
+ * @retval SR_ERR Failure.
*/
SR_PRIV int serial_open(struct sr_serial_dev_inst *serial, int flags)
{
*
* @param serial Previously initialized serial port structure.
*
- * @return SR_OK on success, SR_ERR on failure.
+ * @retval SR_OK Success.
+ * @retval SR_ERR Failure.
*/
SR_PRIV int serial_close(struct sr_serial_dev_inst *serial)
{
*
* @param serial Previously initialized serial port structure.
*
- * @return SR_OK on success, SR_ERR on failure.
+ * @retval SR_OK Success.
+ * @retval SR_ERR Failure.
*/
SR_PRIV int serial_flush(struct sr_serial_dev_inst *serial)
{
return SR_OK;
}
-/**
- * Write a number of bytes to the specified serial port.
- *
- * @param serial Previously initialized serial port structure.
- * @param buf Buffer containing the bytes to write.
- * @param count Number of bytes to write.
- *
- * @return The number of bytes written, or a negative error code upon failure.
- */
-SR_PRIV int serial_write(struct sr_serial_dev_inst *serial,
- const void *buf, size_t count)
+static int _serial_write(struct sr_serial_dev_inst *serial,
+ const void *buf, size_t count, int nonblocking)
{
ssize_t ret;
char *error;
return SR_ERR;
}
- if (serial->nonblocking)
+ if (nonblocking)
ret = sp_nonblocking_write(serial->data, buf, count);
else
ret = sp_blocking_write(serial->data, buf, count, 0);
}
/**
- * Read a number of bytes from the specified serial port.
+ * Write a number of bytes to the specified serial port.
*
* @param serial Previously initialized serial port structure.
- * @param buf Buffer where to store the bytes that are read.
- * @param count The number of bytes to read.
+ * @param[in] buf Buffer containing the bytes to write.
+ * @param[in] count Number of bytes to write.
*
- * @return The number of bytes read, or a negative error code upon failure.
+ * @retval SR_ERR_ARG Invalid argument.
+ * @retval SR_ERR Other error.
+ * @retval other The number of bytes written.
*/
-SR_PRIV int serial_read(struct sr_serial_dev_inst *serial, void *buf,
- size_t count)
+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;
return SR_ERR;
}
- if (serial->nonblocking)
+ if (nonblocking)
ret = sp_nonblocking_read(serial->data, buf, count);
else
ret = sp_blocking_read(serial->data, buf, count, 0);
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[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_OK Success.
* @retval SR_ERR Failure.
*/
SR_PRIV int serial_set_params(struct sr_serial_dev_inst *serial, int baudrate,
}
/**
- * Set serial parameters for the specified serial port.
+ * 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, in the form
- * of \<speed\>/\<data bits\>\<parity\>\<stopbits\>\<flow\>, for example
- * "9600/8n1" or "600/7o2" or "460800/8n1/flow=2" where flow is 0 for none,
- * 1 for rts/cts and 2 for xon/xoff.
- *
+ * @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.
*/
-#define SERIAL_COMM_SPEC "^(\\d+)/([5678])([neo])([12])(.*)$"
SR_PRIV int serial_set_paramstr(struct sr_serial_dev_inst *serial,
const char *paramstr)
{
+#define SERIAL_COMM_SPEC "^(\\d+)/([5678])([neo])([12])(.*)$"
+
GRegex *reg;
GMatchInfo *match;
int speed, databits, parity, stopbits, flow, rts, dtr, i;
* critical, but it helps fine tune the serial port polling
* delay.
*
- * @retval SR_OK Valid packet was found within the given timeout
+ * @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_t is_valid,
+ size_t packet_size,
+ packet_valid_callback is_valid,
uint64_t timeout_ms, int baudrate)
{
uint64_t start, time, byte_delay_us;
typedef int event_handle;
#endif
-SR_PRIV int serial_source_add(struct sr_serial_dev_inst *serial, int events,
- int timeout, sr_receive_data_callback_t cb, void *cb_data)
+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 (mask & SP_EVENT_ERROR)
serial->pollfds[i].events |= G_IO_ERR;
- if (sr_session_source_add_pollfd(&serial->pollfds[i],
- timeout, cb, cb_data) != SR_OK)
+ 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_serial_dev_inst *serial)
+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(&serial->pollfds[i]) != SR_OK)
+ if (sr_session_source_remove_pollfd(session, &serial->pollfds[i]) != SR_OK)
return SR_ERR;
g_free(serial->pollfds);
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