mirror of
https://gitlab.freedesktop.org/libevdev/libevdev.git
synced 2025-12-24 19:20:06 +01:00
Add functions to toggle LEDs on the device
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net> Reviewed-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>
This commit is contained in:
Peter Hutterer
parent
bfb6c1c6c5
commit
4d4293a65b
3 changed files with 258 additions and 0 deletions
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@ -1179,3 +1179,62 @@ libevdev_get_repeat(struct libevdev *dev, int *delay, int *period)
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return 0;
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}
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int
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libevdev_kernel_set_led_value(struct libevdev *dev, unsigned int code, enum EvdevLEDValues value)
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{
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return libevdev_kernel_set_led_values(dev, code, value, -1);
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}
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int
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libevdev_kernel_set_led_values(struct libevdev *dev, ...)
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{
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struct input_event ev[LED_MAX];
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enum EvdevLEDValues val;
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va_list args;
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int code;
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int rc = 0;
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size_t nleds = 0;
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memset(ev, 0, sizeof(ev));
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va_start(args, dev);
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code = va_arg(args, unsigned int);
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while (code != -1) {
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if (code > LED_MAX) {
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rc = -EINVAL;
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break;
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}
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val = va_arg(args, enum EvdevLEDValues);
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if (val != LIBEVDEV_LED_ON && val != LIBEVDEV_LED_OFF) {
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rc = -EINVAL;
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break;
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}
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if (libevdev_has_event_code(dev, EV_LED, code)) {
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struct input_event *e = ev;
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while (e->type > 0 && e->code != code)
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e++;
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if (e->type == 0)
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nleds++;
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e->type = EV_LED;
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e->code = code;
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e->value = (val == LIBEVDEV_LED_ON);
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}
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code = va_arg(args, unsigned int);
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}
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va_end(args);
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if (rc == 0 && nleds > 0) {
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rc = write(libevdev_get_fd(dev), ev, nleds * sizeof(ev[0]));
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if (rc > 0) {
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while (nleds--)
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update_led_state(dev, &ev[nleds]);
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}
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rc = (rc != -1) ? 0 : -errno;
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}
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return rc;
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}
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@ -1146,6 +1146,52 @@ int libevdev_disable_event_code(struct libevdev *dev, unsigned int type, unsigne
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*/
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int libevdev_kernel_set_abs_info(struct libevdev *dev, unsigned int code, const struct input_absinfo *abs);
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enum EvdevLEDValues {
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LIBEVDEV_LED_ON = 3,
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LIBEVDEV_LED_OFF = 4,
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};
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/**
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* @ingroup kernel
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*
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* Turn an LED on or off. Convenience function, if you need to modify multiple
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* LEDs simultaneously, use libevdev_kernel_set_led_values() instead.
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*
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* @note enabling an LED requires write permissions on the device's file descriptor.
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*
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* @param dev The evdev device, already initialized with libevdev_set_fd()
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* @param code The EV_LED event code to modify, one of LED_NUML, LED_CAPSL, ...
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* @param value Specifies whether to turn the LED on or off
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* @return zero on success, or a negative errno on failure
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*/
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int libevdev_kernel_set_led_value(struct libevdev *dev, unsigned int code, enum EvdevLEDValues value);
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/**
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* @ingroup kernel
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*
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* Turn multiple LEDs on or off simultaneously. This function expects a pair
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* of LED codes and values to set them to, terminated by a -1. For example, to
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* switch the NumLock LED on but the CapsLock LED off, use:
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*
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* @code
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* libevdev_kernel_set_led_values(dev, LED_NUML, LIBEVDEV_LED_ON,
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* LED_CAPSL, LIBEVDEV_LED_OFF,
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* -1);
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* @endcode
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*
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* If any LED code or value is invalid, this function returns -EINVAL and no
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* LEDs are modified.
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*
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* @note enabling an LED requires write permissions on the device's file descriptor.
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*
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* @param dev The evdev device, already initialized with libevdev_set_fd()
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* @param ... A pair of LED_* event codes and enum EvdevLEDValues, followed by
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* -1 to terminate the list.
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* @return zero on success, or a negative errno on failure
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*/
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int libevdev_kernel_set_led_values(struct libevdev *dev, ...);
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/**
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* @ingroup misc
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*
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@ -923,6 +923,153 @@ START_TEST(test_device_kernel_change_axis_invalid)
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}
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END_TEST
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START_TEST(test_led_valid)
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{
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struct uinput_device* uidev;
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struct libevdev *dev;
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int rc;
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rc = test_create_device(&uidev, &dev,
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EV_LED, LED_NUML,
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EV_LED, LED_CAPSL,
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EV_LED, LED_COMPOSE,
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-1);
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ck_assert_msg(rc == 0, "Failed to create device: %s", strerror(-rc));
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rc = libevdev_kernel_set_led_value(dev, LED_NUML, LIBEVDEV_LED_ON);
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ck_assert_int_eq(rc, 0);
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rc = libevdev_kernel_set_led_value(dev, LED_NUML, LIBEVDEV_LED_OFF);
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ck_assert_int_eq(rc, 0);
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rc = libevdev_kernel_set_led_values(dev,
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LED_NUML, LIBEVDEV_LED_OFF,
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LED_CAPSL, LIBEVDEV_LED_ON,
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LED_COMPOSE, LIBEVDEV_LED_OFF,
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-1);
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ck_assert_int_eq(rc, 0);
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ck_assert_int_eq(0, libevdev_get_event_value(dev, EV_LED, LED_NUML));
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ck_assert_int_eq(1, libevdev_get_event_value(dev, EV_LED, LED_CAPSL));
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ck_assert_int_eq(0, libevdev_get_event_value(dev, EV_LED, LED_COMPOSE));
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rc = libevdev_kernel_set_led_values(dev,
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LED_NUML, LIBEVDEV_LED_ON,
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LED_CAPSL, LIBEVDEV_LED_OFF,
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LED_COMPOSE, LIBEVDEV_LED_ON,
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-1);
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ck_assert_int_eq(rc, 0);
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ck_assert_int_eq(1, libevdev_get_event_value(dev, EV_LED, LED_NUML));
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ck_assert_int_eq(0, libevdev_get_event_value(dev, EV_LED, LED_CAPSL));
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ck_assert_int_eq(1, libevdev_get_event_value(dev, EV_LED, LED_COMPOSE));
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/* make sure we ignore unset leds */
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rc = libevdev_kernel_set_led_values(dev,
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LED_NUML, LIBEVDEV_LED_ON,
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LED_CAPSL, LIBEVDEV_LED_OFF,
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LED_SCROLLL, LIBEVDEV_LED_OFF,
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LED_COMPOSE, LIBEVDEV_LED_ON,
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-1);
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ck_assert_int_eq(rc, 0);
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ck_assert_int_eq(1, libevdev_get_event_value(dev, EV_LED, LED_NUML));
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ck_assert_int_eq(0, libevdev_get_event_value(dev, EV_LED, LED_CAPSL));
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ck_assert_int_eq(1, libevdev_get_event_value(dev, EV_LED, LED_COMPOSE));
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libevdev_free(dev);
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uinput_device_free(uidev);
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}
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END_TEST
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START_TEST(test_led_invalid)
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{
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struct uinput_device* uidev;
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struct libevdev *dev;
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int rc;
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rc = test_create_device(&uidev, &dev,
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EV_LED, LED_NUML,
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EV_LED, LED_CAPSL,
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EV_LED, LED_COMPOSE,
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-1);
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ck_assert_msg(rc == 0, "Failed to create device: %s", strerror(-rc));
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rc = libevdev_kernel_set_led_value(dev, LED_MAX + 1, LIBEVDEV_LED_ON);
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ck_assert_int_eq(rc, -EINVAL);
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rc = libevdev_kernel_set_led_value(dev, LED_NUML, LIBEVDEV_LED_OFF + 1);
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ck_assert_int_eq(rc, -EINVAL);
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rc = libevdev_kernel_set_led_value(dev, LED_SCROLLL, LIBEVDEV_LED_ON);
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ck_assert_int_eq(rc, 0);
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rc = libevdev_kernel_set_led_values(dev,
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LED_NUML, LIBEVDEV_LED_OFF + 1,
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-1);
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ck_assert_int_eq(rc, -EINVAL);
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rc = libevdev_kernel_set_led_values(dev,
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LED_MAX + 1, LIBEVDEV_LED_ON,
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LED_NUML, LIBEVDEV_LED_OFF + 1,
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-1);
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ck_assert_int_eq(rc, -EINVAL);
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rc = libevdev_kernel_set_led_values(dev,
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LED_SCROLLL, LIBEVDEV_LED_OFF,
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-1);
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ck_assert_int_eq(rc, 0);
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libevdev_free(dev);
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uinput_device_free(uidev);
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}
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END_TEST
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START_TEST(test_led_same)
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{
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struct uinput_device* uidev;
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struct libevdev *dev;
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int rc;
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rc = test_create_device(&uidev, &dev,
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EV_LED, LED_NUML,
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EV_LED, LED_CAPSL,
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EV_LED, LED_COMPOSE,
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-1);
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ck_assert_msg(rc == 0, "Failed to create device: %s", strerror(-rc));
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rc = libevdev_kernel_set_led_values(dev,
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LED_NUML, LIBEVDEV_LED_OFF,
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LED_NUML, LIBEVDEV_LED_ON,
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LED_NUML, LIBEVDEV_LED_OFF,
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LED_NUML, LIBEVDEV_LED_ON,
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LED_NUML, LIBEVDEV_LED_OFF,
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LED_NUML, LIBEVDEV_LED_ON,
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LED_NUML, LIBEVDEV_LED_OFF,
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LED_NUML, LIBEVDEV_LED_ON,
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LED_NUML, LIBEVDEV_LED_OFF,
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LED_NUML, LIBEVDEV_LED_ON,
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LED_NUML, LIBEVDEV_LED_OFF,
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LED_NUML, LIBEVDEV_LED_ON,
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LED_NUML, LIBEVDEV_LED_OFF,
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LED_NUML, LIBEVDEV_LED_ON,
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LED_NUML, LIBEVDEV_LED_OFF,
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LED_NUML, LIBEVDEV_LED_ON,
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LED_NUML, LIBEVDEV_LED_OFF,
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LED_NUML, LIBEVDEV_LED_ON,
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LED_NUML, LIBEVDEV_LED_OFF,
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LED_NUML, LIBEVDEV_LED_ON,
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LED_NUML, LIBEVDEV_LED_OFF,
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LED_NUML, LIBEVDEV_LED_ON,
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LED_NUML, LIBEVDEV_LED_OFF,
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LED_NUML, LIBEVDEV_LED_ON,
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/* more than LED_CNT */
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-1);
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ck_assert_int_eq(rc, 0);
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ck_assert_int_eq(1, libevdev_get_event_value(dev, EV_LED, LED_NUML));
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ck_assert_int_eq(0, libevdev_get_event_value(dev, EV_LED, LED_CAPSL));
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ck_assert_int_eq(0, libevdev_get_event_value(dev, EV_LED, LED_COMPOSE));
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libevdev_free(dev);
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uinput_device_free(uidev);
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}
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END_TEST
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Suite *
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libevdev_has_event_test(void)
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{
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@ -971,6 +1118,12 @@ libevdev_has_event_test(void)
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tcase_add_test(tc, test_device_kernel_change_axis_invalid);
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suite_add_tcase(s, tc);
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tc = tcase_create("led manipulation");
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tcase_add_test(tc, test_led_valid);
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tcase_add_test(tc, test_led_invalid);
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tcase_add_test(tc, test_led_same);
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suite_add_tcase(s, tc);
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return s;
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}
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