cdev: Implement get_state callback

1 files changed, 16 insertions, 2 deletions

diff --git a/cdev.c b/cdev.c
index 6371c3f..465e175 100644
--- a/cdev.c
+++ b/cdev.c
@@ -71,8 +71,22 @@ static int pwm_chip_cdev_apply_state(struct pwm *pwm,
 
 static int pwm_chip_cdev_get_state(struct pwm *pwm, struct pwm_state *state)
 {
-	errno = EIO;
-	return -1;
+	struct pwm_cdev *pwm_cdev = container_of(pwm, struct pwm_cdev, pwm);
+	struct pwm_chip_cdev *chip_cdev = container_of(pwm->chip, struct pwm_chip_cdev, chip);
+	const struct pwmchip_state s = {
+		.hwpwm = pwm_cdev->hwpwm,
+	};
+	int ret;
+
+	ret = ioctl(chip_cdev->fd, PWM_IOCTL_GET, &s);
+	if (ret)
+		return ret;
+
+	state->period = s.period;
+	state->duty_cycle = s.duty_cycle;
+	state->duty_offset = s.duty_offset;
+
+	return 0;
 }
 
 struct pwm_chip *pwm_chip_cdev_open_by_number(unsigned int num)