Function get_hid_report_descriptor_from_sysfs

lib/hidapi/linux/hid.c:385–397

return size of the descriptor, or -1 on failure */

/* return size of the descriptor, or -1 on failure */
static int get_hid_report_descriptor_from_sysfs(const char *sysfs_path, struct hidraw_report_descriptor *rpt_desc)
{
	int res = -1;
	/* Construct <sysfs_path>/device/report_descriptor */
	size_t rpt_path_len = strlen(sysfs_path) + 25 + 1;
	char* rpt_path = (char*) calloc(1, rpt_path_len);
	snprintf(rpt_path, rpt_path_len, "%s/device/report_descriptor", sysfs_path);

	res = get_hid_report_descriptor(rpt_path, rpt_desc);
	free(rpt_path);

	return res;
}

/* return non-zero if successfully parsed */
static int parse_hid_vid_pid_from_uevent(const char *uevent, unsigned *bus_type, unsigned short *vendor_id, unsigned short *product_id)