1 files changed, 98 insertions, 0 deletions
diff --git a/libgamepad_open_device.c b/libgamepad_open_device.c
new file mode 100644
index 0000000..5b32658
--- /dev/null
+++ b/libgamepad_open_device.c
@@ -0,0 +1,98 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+
+int
+libgamepad_open_device(struct libgamepad_device *devicep, int dirfd, const char *path, int mode)
+{
+	int err;
+	unsigned int i;
+	uint16_t n;
+
+	devicep->fd = dirfd;
+	devicep->close_fd = 0;
+	devicep->require_sync = 0;
+	devicep->dev = NULL;
+	devicep->buttons = NULL;
+	devicep->absolute_axes = NULL;
+	devicep->relative_axes = NULL;
+
+	if (path && *path) {
+		devicep->fd = openat(dirfd, path, mode);
+		if (devicep->fd < 0)
+			return -1;
+		devicep->close_fd = 1;
+	}
+
+	err = -libevdev_new_from_fd(devicep->fd, &devicep->dev);
+	if (err > 0) {
+		if (devicep->close_fd) {
+			close(devicep->fd);
+			devicep->close_fd = 0;
+		}
+		errno = err;
+		return -1;
+	}
+
+	devicep->name              = libevdev_get_name(devicep->dev);
+	devicep->unique_id         = libevdev_get_uniq(devicep->dev);
+	devicep->physical_location = libevdev_get_phys(devicep->dev);
+	devicep->bus_type          = libevdev_get_id_bustype(devicep->dev);
+	devicep->vendor            = libevdev_get_id_vendor(devicep->dev);
+	devicep->product           = libevdev_get_id_product(devicep->dev);
+	devicep->version           = libevdev_get_id_version(devicep->dev);
+
+	devicep->nbuttons = 0;
+	for (i = 0; i < KEY_CNT; i++) {
+		devicep->button_map[i] = -1;
+		if (libevdev_has_event_code(devicep->dev, EV_KEY, i))
+			devicep->button_map[i] = (int16_t)devicep->nbuttons++;
+	}
+
+	devicep->nabsolute_axes = 0;
+	for (i = 0; i < ABS_CNT; i++) {
+		devicep->absolute_axis_map[i] = -1;
+		if (libevdev_has_event_code(devicep->dev, EV_ABS, i))
+			devicep->absolute_axis_map[i] = (int16_t)devicep->nabsolute_axes++;
+	}
+
+	devicep->nrelative_axes = 0;
+	for (i = 0; i < REL_CNT; i++) {
+		devicep->relative_axis_map[i] = -1;
+		if (libevdev_has_event_code(devicep->dev, EV_REL, i))
+			devicep->relative_axis_map[i] = (int16_t)devicep->nrelative_axes++;
+	}
+
+	if (devicep->nbuttons) {
+		devicep->buttons = calloc(devicep->nbuttons, sizeof(*devicep->buttons));
+		if (!devicep->buttons)
+			goto fail;
+		for (i = 0, n = 0; i < KEY_CNT; i++)
+			if (devicep->button_map[i] >= 0)
+				devicep->buttons[n++] = (uint16_t)i;
+	}
+
+	if (devicep->nabsolute_axes) {
+		devicep->absolute_axes = calloc(devicep->nabsolute_axes, sizeof(*devicep->absolute_axes));
+		if (!devicep->absolute_axes)
+			goto fail;
+		for (i = 0, n = 0; i < ABS_CNT; i++)
+			if (devicep->absolute_axis_map[i] >= 0)
+				devicep->absolute_axes[n++] = (uint16_t)i;
+	}
+
+	if (devicep->nrelative_axes) {
+		devicep->relative_axes = calloc(devicep->nrelative_axes, sizeof(*devicep->relative_axes));
+		if (!devicep->relative_axes)
+			goto fail;
+		for (i = 0, n = 0; i < REL_CNT; i++)
+			if (devicep->relative_axis_map[i] >= 0)
+				devicep->relative_axes[n++] = (uint16_t)i;
+	}
+
+	return 0;
+
+fail:
+	libgamepad_close_device(devicep);
+	return -1;
+}