linux-kernel - Re: [PATCH v2] iio: light: cm32181: Add PM support

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Date:   Wed, 13 Jul 2022 09:30:52 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     Jonathan Cameron <jic23@...nel.org>
Cc:     ktsai@...ellamicro.com, lars@...afoo.de, hdegoede@...hat.com,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] iio: light: cm32181: Add PM support

On Fri, Jul 8, 2022 at 12:40 AM Jonathan Cameron <jic23@...nel.org> wrote:
>
> On Thu,  7 Jul 2022 08:01:51 +0800
> Kai-Heng Feng <kai.heng.feng@...onical.com> wrote:
>
> > The read on in_illuminance_input keeps at 0 after system sleep.
> >
> > So add proper suspend and resume callback to make the sensor keep
> > working after system sleep.
> >
> > Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
> Applied to the togreg branch of iio.git and pushed out as testing for
> the autobuilders to poke at it and see if we missed anything,

This commit doesn't seem to be included in iio/togreg branch.

Kai-Heng

>
> Thanks,
>
> Jonathan
>
> > ---
> > v2:
> >  - Use dev_get_drvdata() instead of i2c_get_clientdata() to avoid extra
> >    dereference.
> >
> >  drivers/iio/light/cm32181.c | 22 ++++++++++++++++++++++
> >  1 file changed, 22 insertions(+)
> >
> > diff --git a/drivers/iio/light/cm32181.c b/drivers/iio/light/cm32181.c
> > index 97649944f1df6..edbe6a3138d0b 100644
> > --- a/drivers/iio/light/cm32181.c
> > +++ b/drivers/iio/light/cm32181.c
> > @@ -460,6 +460,8 @@ static int cm32181_probe(struct i2c_client *client)
> >                       return PTR_ERR(client);
> >       }
> >
> > +     i2c_set_clientdata(client, indio_dev);
> > +
> >       cm32181 = iio_priv(indio_dev);
> >       cm32181->client = client;
> >       cm32181->dev = dev;
> > @@ -486,6 +488,25 @@ static int cm32181_probe(struct i2c_client *client)
> >       return 0;
> >  }
> >
> > +static int cm32181_suspend(struct device *dev)
> > +{
> > +     struct i2c_client *client = to_i2c_client(dev);
> > +
> > +     return i2c_smbus_write_word_data(client, CM32181_REG_ADDR_CMD,
> > +                                      CM32181_CMD_ALS_DISABLE);
> > +}
> > +
> > +static int cm32181_resume(struct device *dev)
> > +{
> > +     struct i2c_client *client = to_i2c_client(dev);
> > +     struct cm32181_chip *cm32181 = iio_priv(dev_get_drvdata(dev));
> > +
> > +     return i2c_smbus_write_word_data(client, CM32181_REG_ADDR_CMD,
> > +                                      cm32181->conf_regs[CM32181_REG_ADDR_CMD]);
> > +}
> > +
> > +DEFINE_SIMPLE_DEV_PM_OPS(cm32181_pm_ops, cm32181_suspend, cm32181_resume);
> > +
> >  static const struct of_device_id cm32181_of_match[] = {
> >       { .compatible = "capella,cm3218" },
> >       { .compatible = "capella,cm32181" },
> > @@ -506,6 +527,7 @@ static struct i2c_driver cm32181_driver = {
> >               .name   = "cm32181",
> >               .acpi_match_table = ACPI_PTR(cm32181_acpi_match),
> >               .of_match_table = cm32181_of_match,
> > +             .pm = pm_sleep_ptr(&cm32181_pm_ops),
> >       },
> >       .probe_new      = cm32181_probe,
> >  };
>