On Thu, Jan 19, 2017 at 02:40:56PM -0800, Dmitry Torokhov wrote:
[...]
> diff --git a/drivers/input/misc/pwm-beeper.c b/drivers/input/misc/pwm-beeper.c
> index 9964c46468d3..7b213e0ab06c 100644
> --- a/drivers/input/misc/pwm-beeper.c
> +++ b/drivers/input/misc/pwm-beeper.c
> @@ -14,6 +14,7 @@
>   */
>  
>  #include <linux/input.h>
> +#include <linux/regulator/consumer.h>
>  #include <linux/module.h>
>  #include <linux/kernel.h>
>  #include <linux/of.h>
> @@ -25,30 +26,59 @@
>  struct pwm_beeper {
>  	struct input_dev *input;
>  	struct pwm_device *pwm;
> +	struct regulator *amplifier;
>  	struct work_struct work;
>  	unsigned long period;
>  	bool suspended;
> +	bool amplifier_on;

Why do you need to track this? I thought regulator_enable() and
regulator_disable() were already reference counted?

Thierry