From: "Ondřej Jirman" <megous@megous.com>
To: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: linux-sunxi@googlegroups.com, Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Maxime Ripard <mripard@kernel.org>, Chen-Yu Tsai <wens@csie.org>,
Luca Weiss <luca@z3ntu.xyz>, Tomas Novotny <tomas@novotny.cz>,
linux-input@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v4 2/4] input: gpio-vibra: Allow to use vcc-supply alone to control the vibrator
Date: Thu, 30 Jul 2020 11:18:12 +0200 [thread overview]
Message-ID: <20200730091812.7sia7w3waz2jj62a@core.my.home> (raw)
In-Reply-To: <20200730061939.GF1665100@dtor-ws>
Hello Dmitry,
thanks for looking into the patch. :)
On Wed, Jul 29, 2020 at 11:19:39PM -0700, Dmitry Torokhov wrote:
> 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).
Oops, I'll fix that in the next revision.
regards,
o.
> > 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
next prev parent reply other threads:[~2020-07-30 9:18 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-14 10:22 [PATCH v4 0/4] Add support for vibrator motor for TBS A711 Tablet Ondrej Jirman
2020-07-14 10:23 ` [PATCH v4 1/4] dt-bindings: input: gpio-vibrator: Don't require enable-gpios Ondrej Jirman
2020-07-14 10:23 ` [PATCH v4 2/4] input: gpio-vibra: Allow to use vcc-supply alone to control the vibrator Ondrej Jirman
2020-07-30 6:19 ` Dmitry Torokhov
2020-07-30 9:18 ` Ondřej Jirman [this message]
2020-07-14 10:23 ` [PATCH v4 3/4] ARM: dts: sun8i-a83t-tbs-a711: Add support for the vibrator motor Ondrej Jirman
2020-07-14 10:23 ` [PATCH v4 4/4] ARM: dts: sun8i-a83t-tbs-a711: Increase voltage on the vibrator Ondrej Jirman
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