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SubjectRe: [PATCH v4 2/4] input: gpio-vibra: Allow to use vcc-supply alone to control the vibrator
Hi Ondrej,

On Tue, Jul 14, 2020 at 12:23:01PM +0200, Ondrej Jirman wrote:
> Make enable-gpio optional to allow using this driver with boards that
> have vibrator connected to a power supply without intermediate gpio
> based enable circuitry.
>
> Also avoid a case where neither regulator nor enable gpio is specified,
> and bail out in probe in such a case.
>
> Signed-off-by: Ondrej Jirman <megous@megous.com>
> ---
> drivers/input/misc/gpio-vibra.c | 14 ++++++++++----
> 1 file changed, 10 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/input/misc/gpio-vibra.c b/drivers/input/misc/gpio-vibra.c
> index f79f75595dd7..b3bb7e61ed1d 100644
> --- a/drivers/input/misc/gpio-vibra.c
> +++ b/drivers/input/misc/gpio-vibra.c
> @@ -39,7 +39,7 @@ static int gpio_vibrator_start(struct gpio_vibrator *vibrator)
> struct device *pdev = vibrator->input->dev.parent;
> int err;
>
> - if (!vibrator->vcc_on) {
> + if (vibrator->vcc && !vibrator->vcc_on) {
> err = regulator_enable(vibrator->vcc);
> if (err) {
> dev_err(pdev, "failed to enable regulator: %d\n", err);
> @@ -57,7 +57,7 @@ static void gpio_vibrator_stop(struct gpio_vibrator *vibrator)
> {
> gpiod_set_value_cansleep(vibrator->gpio, 0);
>
> - if (vibrator->vcc_on) {
> + if (vibrator->vcc && vibrator->vcc_on) {
> regulator_disable(vibrator->vcc);
> vibrator->vcc_on = false;
> }
> @@ -112,7 +112,7 @@ static int gpio_vibrator_probe(struct platform_device *pdev)
> if (!vibrator->input)
> return -ENOMEM;
>
> - vibrator->vcc = devm_regulator_get(&pdev->dev, "vcc");
> + vibrator->vcc = devm_regulator_get_optional(&pdev->dev, "vcc");

I know it is very surprising, but regulator_get_optional does not return
NULL when regulator is not present, but rather ERR_PTR(-ENODEV). You
need to replace it with NULL in the branch below, or change conditions
to !IS_ERR(virbrator->vcc) (and still handle -ENODEV in the branch
below).

> err = PTR_ERR_OR_ZERO(vibrator->vcc);
> if (err) {
> if (err != -EPROBE_DEFER)
> @@ -121,7 +121,8 @@ static int gpio_vibrator_probe(struct platform_device *pdev)
> return err;
> }
>
> - vibrator->gpio = devm_gpiod_get(&pdev->dev, "enable", GPIOD_OUT_LOW);
> + vibrator->gpio = devm_gpiod_get_optional(&pdev->dev, "enable",
> + GPIOD_OUT_LOW);
> err = PTR_ERR_OR_ZERO(vibrator->gpio);
> if (err) {
> if (err != -EPROBE_DEFER)
> @@ -130,6 +131,11 @@ static int gpio_vibrator_probe(struct platform_device *pdev)
> return err;
> }
>
> + if (!vibrator->vcc && !vibrator->gpio) {
> + dev_err(&pdev->dev, "Neither gpio nor regulator provided\n");
> + return -EINVAL;
> + }
> +
> INIT_WORK(&vibrator->play_work, gpio_vibrator_play_work);
>
> vibrator->input->name = "gpio-vibrator";
> --
> 2.27.0
>

Thanks.

--
Dmitry

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