Re: [PATCH v3 6/6] platform/x86: ayaneo-ec: Add suspend hook

["Ilpo Järvinen" <ilpo.jarvinen@linux.intel.com>]

On Sun, 2 Nov 2025, Antheas Kapenekakis wrote:

> On Sun, 2 Nov 2025 at 19:35, Armin Wolf <W_Armin@gmx.de> wrote:
> >
> > Am 31.10.25 um 17:36 schrieb Antheas Kapenekakis:
> >
> > > The Ayaneo EC resets after hibernation, losing the charge control state.
> > > Add a small PM hook to restore this state on hibernation resume.
> > >
> > > The fan speed is also lost during hibernation, but since hibernation
> > > failures are common with this class of devices, setting a low fan speed
> > > when the userspace program controlling the fan will potentially not
> > > take over could cause the device to overheat, so it is not restored.
> >
> > Please update the patch description.
> >
> > >
> > > Signed-off-by: Antheas Kapenekakis <lkml@antheas.dev>
> > > ---
> > >   drivers/platform/x86/ayaneo-ec.c | 73 ++++++++++++++++++++++++++++++++
> > >   1 file changed, 73 insertions(+)
> > >
> > > diff --git a/drivers/platform/x86/ayaneo-ec.c b/drivers/platform/x86/ayaneo-ec.c
> > > index 9548e3d22093..e1ad5968d3b4 100644
> > > --- a/drivers/platform/x86/ayaneo-ec.c
> > > +++ b/drivers/platform/x86/ayaneo-ec.c
> > > @@ -41,6 +41,8 @@
> > >   #define AYANEO_MODULE_LEFT  BIT(0)
> > >   #define AYANEO_MODULE_RIGHT BIT(1)
> > >
> > > +#define AYANEO_CACHE_LEN     1
> > > +
> > >   struct ayaneo_ec_quirk {
> > >       bool has_fan_control;
> > >       bool has_charge_control;
> > > @@ -51,6 +53,9 @@ struct ayaneo_ec_platform_data {
> > >       struct platform_device *pdev;
> > >       struct ayaneo_ec_quirk *quirks;
> > >       struct acpi_battery_hook battery_hook;
> > > +
> > > +     bool restore_charge_limit;
> > > +     bool restore_pwm;
> > >   };
> > >
> > >   static const struct ayaneo_ec_quirk quirk_fan = {
> > > @@ -207,10 +212,14 @@ static int ayaneo_ec_read(struct device *dev, enum hwmon_sensor_types type,
> > >   static int ayaneo_ec_write(struct device *dev, enum hwmon_sensor_types type,
> > >                          u32 attr, int channel, long val)
> > >   {
> > > +     struct ayaneo_ec_platform_data *data = platform_get_drvdata(
> > > +             to_platform_device(dev));
> > > +     int ret;
> > >       switch (type) {
> > >       case hwmon_pwm:
> > >               switch (attr) {
> > >               case hwmon_pwm_enable:
> > > +                     data->restore_pwm = false;
> > >                       switch (val) {
> > >                       case 1:
> > >                               return ec_write(AYANEO_PWM_ENABLE_REG,
> > > @@ -224,6 +233,15 @@ static int ayaneo_ec_write(struct device *dev, enum hwmon_sensor_types type,
> > >               case hwmon_pwm_input:
> > >                       if (val < 0 || val > 255)
> > >                               return -EINVAL;
> > > +                     if (data->restore_pwm) {
> > > +                             // Defer restoring PWM control to after
> > > +                             // userspace resumes successfully
> > > +                             ret = ec_write(AYANEO_PWM_ENABLE_REG,
> > > +                                            AYANEO_PWM_MODE_MANUAL);
> > > +                             if (ret)
> > > +                                     return ret;
> > > +                             data->restore_pwm = false;
> >
> > I suspect that you need to use a mutex to protect the restore sequence.
> 
> This is indeed true. I can respin the last patch with a mutex and fix
> the description.
> 
> If the date on the control modules patch is the only issue, I can skip
> re-sending the first 5.

As usual, please send next version of the series once you've addressed the 
review comments.

If you want some patches to not delay the first part of the series, send 
those separately.

--
 i.

> 
> 
> > Thanks,
> > Armin Wolf
> >
> > > +                     }
> > >                       return ec_write(AYANEO_PWM_REG, (val * 100) / 255);
> > >               default:
> > >                       break;
> > > @@ -474,10 +492,65 @@ static int ayaneo_ec_probe(struct platform_device *pdev)
> > >       return 0;
> > >   }
> > >
> > > +static int ayaneo_freeze(struct device *dev)
> > > +{
> > > +     struct platform_device *pdev = to_platform_device(dev);
> > > +     struct ayaneo_ec_platform_data *data = platform_get_drvdata(pdev);
> > > +     int ret;
> > > +     u8 tmp;
> > > +
> > > +     if (data->quirks->has_charge_control) {
> > > +             ret = ec_read(AYANEO_CHARGE_REG, &tmp);
> > > +             if (ret)
> > > +                     return ret;
> > > +
> > > +             data->restore_charge_limit = tmp == AYANEO_CHARGE_VAL_INHIBIT;
> > > +     }
> > > +
> > > +     if (data->quirks->has_fan_control) {
> > > +             ret = ec_read(AYANEO_PWM_ENABLE_REG, &tmp);
> > > +             if (ret)
> > > +                     return ret;
> > > +
> > > +             data->restore_pwm = tmp == AYANEO_PWM_MODE_MANUAL;
> > > +
> > > +             // Release the fan when entering hibernation to avoid
> > > +             // overheating if hibernation fails and hangs
> > > +             if (data->restore_pwm) {
> > > +                     ret = ec_write(AYANEO_PWM_ENABLE_REG, AYANEO_PWM_MODE_AUTO);
> > > +                     if (ret)
> > > +                             return ret;
> > > +             }
> > > +     }
> > > +
> > > +     return 0;
> > > +}
> > > +
> > > +static int ayaneo_restore(struct device *dev)
> > > +{
> > > +     struct platform_device *pdev = to_platform_device(dev);
> > > +     struct ayaneo_ec_platform_data *data = platform_get_drvdata(pdev);
> > > +     int ret;
> > > +
> > > +     if (data->quirks->has_charge_control && data->restore_charge_limit) {
> > > +             ret = ec_write(AYANEO_CHARGE_REG, AYANEO_CHARGE_VAL_INHIBIT);
> > > +             if (ret)
> > > +                     return ret;
> > > +     }
> > > +
> > > +     return 0;
> > > +}
> > > +
> > > +static const struct dev_pm_ops ayaneo_pm_ops = {
> > > +     .freeze = ayaneo_freeze,
> > > +     .restore = ayaneo_restore,
> > > +};
> > > +
> > >   static struct platform_driver ayaneo_platform_driver = {
> > >       .driver = {
> > >               .name = "ayaneo-ec",
> > >               .dev_groups = ayaneo_ec_groups,
> > > +             .pm = &ayaneo_pm_ops,
> > >       },
> > >       .probe = ayaneo_ec_probe,
> > >   };
> >
> 
>