linux-kernel - Re: [PATCH 3/4] Input: pwm-vibra

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Date:   Fri, 28 Apr 2023 11:11:07 +0100
From:   Caleb Connolly <caleb.connolly@...aro.org>
To:     Luca Weiss <luca@...tu.xyz>, ~postmarketos/upstreaming@...ts.sr.ht,
        phone-devel@...r.kernel.org,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Sebastian Reichel <sre@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Brian Masney <masneyb@...tation.org>
Cc:     linux-input@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH 3/4] Input: pwm-vibra - add support for enable GPIO



On 27/04/2023 21:34, Luca Weiss wrote:
> 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@...tu.xyz>

Reviewed-by: Caleb Connolly <caleb.connolly@...aro.org>
> ---
>   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@...afoo.de>
>    */
>   
> +#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) {
>