Don't define names ending with _t (POSIX reserved).

[libsigrok.git] / hardware / common / serial.c

diff --git a/hardware/common/serial.c b/hardware/common/serial.c
index a267d6fb88367fa246c3c739a697b218e110a0dc..e99b768b524bbb949550bb4fc958d499e2919c01 100644 (file)
--- a/hardware/common/serial.c
+++ b/hardware/common/serial.c
@@ -22,6 +22,7 @@
 #include <string.h>
 #include <stdlib.h>
 #include <glib.h>
+#include <glib/gstdio.h>
 #include <libserialport.h>
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
@@ -569,7 +570,8 @@ SR_PRIV int serial_readline(struct sr_serial_dev_inst *serial, char **buf,
  */
 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;
@@ -683,7 +685,7 @@ 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)
+               int timeout, sr_receive_data_callback cb, void *cb_data)
 {
        enum sp_event mask = 0;
        unsigned int i;
@@ -742,3 +744,142 @@ SR_PRIV int serial_source_remove(struct sr_serial_dev_inst *serial)
 
        return SR_OK;
 }
+
+/**
+ * Find USB serial devices via the USB vendor ID and product ID.
+ *
+ * @param vendor_id Vendor ID of the USB device.
+ * @param 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
+}