New driver API function: config_list()

This takes an sr_config key and returns a list of possible values for
that key to be submitted with config_set(). The format of the list and
its contents is dependent on the key.

This will replace the SR_DI_* keys that returned such a list before,
such as SR_DI_SAMPLERATES.

hwdriver.c

@@ -329,6 +329,22 @@ SR_API int sr_info_get(struct sr_dev_driver *driver, int id,
 	return ret;
 }
 
+SR_API int sr_config_list(struct sr_dev_driver *driver, int id,
+		const void **data, const struct sr_dev_inst *sdi)
+{
+	int ret;
+
+	if (driver == NULL || data == NULL)
+		return SR_ERR;
+
+	if (!driver->config_list)
+		return SR_ERR;
+
+	ret = driver->config_list(id, data, sdi);
+
+	return ret;
+}
+
 /**
  * Find out if a hardware driver has a specific capability.
  *

libsigrok.h

@@ -599,6 +599,8 @@ struct sr_dev_driver {
 			const struct sr_dev_inst *sdi);
 	int (*config_set) (int id, const void *value,
 			const struct sr_dev_inst *sdi);
+	int (*config_list) (int info_id, const void **data,
+			const struct sr_dev_inst *sdi);
 
 	/* Device-specific */
 	int (*dev_open) (struct sr_dev_inst *sdi);

proto.h

@@ -72,6 +72,8 @@ SR_API int sr_driver_init(struct sr_context *ctx,
 SR_API GSList *sr_driver_scan(struct sr_dev_driver *driver, GSList *options);
 SR_API int sr_info_get(struct sr_dev_driver *driver, int id,
 		const void **data, const struct sr_dev_inst *sdi);
+SR_API int sr_config_list(struct sr_dev_driver *driver, int id,
+		const void **data, const struct sr_dev_inst *sdi);
 SR_API gboolean sr_driver_hwcap_exists(struct sr_dev_driver *driver, int hwcap);
 SR_API const struct sr_config_info *sr_config_info_get(int key);
 SR_API const struct sr_config_info *sr_config_info_name_get(const char *optname);