Some pwm vibrators have a dedicated enable GPIO that needs to be set
high so that the vibrator works. Add support for that optionally.
Signed-off-by: Luca Weiss <luca@xxxxxxxxx>
---
drivers/input/misc/pwm-vibra.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/drivers/input/misc/pwm-vibra.c b/drivers/input/misc/pwm-vibra.c
index c08971c97ad6..2ba035299db8 100644
--- a/drivers/input/misc/pwm-vibra.c
+++ b/drivers/input/misc/pwm-vibra.c
@@ -11,6 +11,7 @@
* Copyright (C) 2010, Lars-Peter Clausen <lars@xxxxxxxxxx>
*/
+#include <linux/gpio/consumer.h>
#include <linux/input.h>
#include <linux/kernel.h>
#include <linux/module.h>
@@ -23,6 +24,7 @@
struct pwm_vibrator {
struct input_dev *input;
+ struct gpio_desc *enable_gpio;
struct pwm_device *pwm;
struct pwm_device *pwm_dir;
struct regulator *vcc;
@@ -48,6 +50,8 @@ static int pwm_vibrator_start(struct pwm_vibrator *vibrator)
vibrator->vcc_on = true;
}
+ gpiod_set_value_cansleep(vibrator->enable_gpio, 1);
+
pwm_get_state(vibrator->pwm, &state);
pwm_set_relative_duty_cycle(&state, vibrator->level, 0xffff);
state.enabled = true;
@@ -80,6 +84,8 @@ static void pwm_vibrator_stop(struct pwm_vibrator *vibrator)
pwm_disable(vibrator->pwm_dir);
pwm_disable(vibrator->pwm);
+ gpiod_set_value_cansleep(vibrator->enable_gpio, 0);
+
if (vibrator->vcc_on) {
regulator_disable(vibrator->vcc);
vibrator->vcc_on = false;
@@ -142,6 +148,16 @@ static int pwm_vibrator_probe(struct platform_device *pdev)
return err;
}
+ vibrator->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",
+ GPIOD_OUT_LOW);
+ err = PTR_ERR_OR_ZERO(vibrator->enable_gpio);
+ if (err) {
+ if (err != -EPROBE_DEFER)
+ dev_err(&pdev->dev, "Failed to request enable gpio: %d\n",
+ err);
+ return err;
+ }
+
vibrator->pwm = devm_pwm_get(&pdev->dev, "enable");
err = PTR_ERR_OR_ZERO(vibrator->pwm);
if (err) {
--
2.40.0
