Re: [PATCH v3 05/13] gpiolib: acpi: Add wake_capable variants of acpi_dev_gpio_irq_get

[Raul Rangel]

On Mon, Sep 19, 2022 at 3:54 AM Andy Shevchenko
<andriy.shevchenko@xxxxxxxxxxxxxxx> wrote:
>
> On Wed, Sep 14, 2022 at 05:57:53PM -0600, Raul E Rangel wrote:
> > The ACPI spec defines the SharedAndWake and ExclusiveAndWake share type
> > keywords. This is an indication that the GPIO IRQ can also be used as a
> > wake source. This change exposes the wake_capable bit so drivers can
> > correctly enable wake functionality instead of making an assumption.
>
> With two nit-picks below
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
>
> > Signed-off-by: Raul E Rangel <rrangel@xxxxxxxxxxxx>
> > ---
> >
> > Changes in v3:
> > - Kept `acpi_dev_gpio_irq_get_by` unchanged to avoid having to touch
> >   unrelated drivers.
> > - Converted wake_capable parameter to bool.
> >
> > Changes in v2:
> > - Fixed call site in mlxbf_gige_probe
> >
> >  drivers/gpio/gpiolib-acpi.c | 17 ++++++++++++++---
> >  drivers/gpio/gpiolib-acpi.h |  2 ++
> >  include/linux/acpi.h        | 22 ++++++++++++++++++----
> >  3 files changed, 34 insertions(+), 7 deletions(-)
> >

> > diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
> > index 9be1376f9a627f..c703f095993a2c 100644
> > --- a/drivers/gpio/gpiolib-acpi.c
> > +++ b/drivers/gpio/gpiolib-acpi.c
> > @@ -741,6 +741,8 @@ static int acpi_populate_gpio_lookup(struct acpi_resource *ares, void *data)
> >               lookup->info.pin_config = agpio->pin_config;
> >               lookup->info.debounce = agpio->debounce_timeout;
> >               lookup->info.gpioint = gpioint;
> > +             lookup->info.wake_capable = agpio->wake_capable ==
> > +                                         ACPI_WAKE_CAPABLE;
>
> Can be still on one line.
>

I used clang-format to format the code. Apparently that still uses the
80 char limit. I've gone ahead and manually changed it.

> >               /*
> >                * Polarity and triggering are only specified for GpioInt
> > @@ -987,10 +989,12 @@ struct gpio_desc *acpi_node_get_gpiod(struct fwnode_handle *fwnode,
> >  }
> >
> >  /**
> > - * acpi_dev_gpio_irq_get_by() - Find GpioInt and translate it to Linux IRQ number
> > + * acpi_dev_gpio_irq_wake_get_by() - Find GpioInt and translate it to Linux IRQ
> > + *                                   number
> >   * @adev: pointer to a ACPI device to get IRQ from
> >   * @name: optional name of GpioInt resource
> >   * @index: index of GpioInt resource (starting from %0)
> > + * @wake_capable: Set to true if the IRQ is wake capable
> >   *
> >   * If the device has one or more GpioInt resources, this function can be
> >   * used to translate from the GPIO offset in the resource to the Linux IRQ
> > @@ -1002,9 +1006,13 @@ struct gpio_desc *acpi_node_get_gpiod(struct fwnode_handle *fwnode,
> >   * The function takes optional @name parameter. If the resource has a property
> >   * name, then only those will be taken into account.
> >   *
> > + * The GPIO is considered wake capable if the GpioInt resource specifies
> > + * SharedAndWake or ExclusiveAndWake.
> > + *
> >   * Return: Linux IRQ number (> %0) on success, negative errno on failure.
> >   */
> > -int acpi_dev_gpio_irq_get_by(struct acpi_device *adev, const char *name, int index)
> > +int acpi_dev_gpio_irq_wake_get_by(struct acpi_device *adev, const char *name,
> > +                               int index, bool *wake_capable)
> >  {
> >       int idx, i;
> >       unsigned int irq_flags;
> > @@ -1061,13 +1069,16 @@ int acpi_dev_gpio_irq_get_by(struct acpi_device *adev, const char *name, int ind
> >                               dev_dbg(&adev->dev, "IRQ %d already in use\n", irq);
> >                       }
> >
> > +                     if (wake_capable)
> > +                             *wake_capable = info.wake_capable;
> > +
> >                       return irq;
> >               }
> >
> >       }
> >       return -ENOENT;
> >  }
> > -EXPORT_SYMBOL_GPL(acpi_dev_gpio_irq_get_by);
> > +EXPORT_SYMBOL_GPL(acpi_dev_gpio_irq_wake_get_by);
> >
> >  static acpi_status
> >  acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address,
> > diff --git a/drivers/gpio/gpiolib-acpi.h b/drivers/gpio/gpiolib-acpi.h
> > index e476558d947136..1ac6816839dbce 100644
> > --- a/drivers/gpio/gpiolib-acpi.h
> > +++ b/drivers/gpio/gpiolib-acpi.h
> > @@ -18,6 +18,7 @@ struct acpi_device;
> >   * @pin_config: pin bias as provided by ACPI
> >   * @polarity: interrupt polarity as provided by ACPI
> >   * @triggering: triggering type as provided by ACPI
> > + * @wake_capable: wake capability as provided by ACPI
> >   * @debounce: debounce timeout as provided by ACPI
> >   * @quirks: Linux specific quirks as provided by struct acpi_gpio_mapping
> >   */
> > @@ -28,6 +29,7 @@ struct acpi_gpio_info {
> >       int pin_config;
> >       int polarity;
> >       int triggering;
> > +     bool wake_capable;
> >       unsigned int debounce;
> >       unsigned int quirks;
> >  };
> > diff --git a/include/linux/acpi.h b/include/linux/acpi.h
> > index 6f64b2f3dc5479..d3121cef6cc3bc 100644
> > --- a/include/linux/acpi.h
> > +++ b/include/linux/acpi.h
> > @@ -1202,7 +1202,8 @@ bool acpi_gpio_get_irq_resource(struct acpi_resource *ares,
> >                               struct acpi_resource_gpio **agpio);
> >  bool acpi_gpio_get_io_resource(struct acpi_resource *ares,
> >                              struct acpi_resource_gpio **agpio);
> > -int acpi_dev_gpio_irq_get_by(struct acpi_device *adev, const char *name, int index);
> > +int acpi_dev_gpio_irq_wake_get_by(struct acpi_device *adev, const char *name,
> > +                               int index, bool *wake_capable);
> >  #else
> >  static inline bool acpi_gpio_get_irq_resource(struct acpi_resource *ares,
> >                                             struct acpi_resource_gpio **agpio)
> > @@ -1214,16 +1215,29 @@ static inline bool acpi_gpio_get_io_resource(struct acpi_resource *ares,
> >  {
> >       return false;
> >  }
> > -static inline int acpi_dev_gpio_irq_get_by(struct acpi_device *adev,
> > -                                        const char *name, int index)
> > +static inline int acpi_dev_gpio_irq_wake_get_by(struct acpi_device *adev,
> > +                                             const char *name, int index,
> > +                                             bool *wake_capable)
> >  {
> >       return -ENXIO;
> >  }
> >  #endif
> >
> > +static inline int acpi_dev_gpio_irq_get_by(struct acpi_device *adev,
> > +                                        const char *name, int index)
> > +{
> > +     return acpi_dev_gpio_irq_wake_get_by(adev, name, index, NULL);
> > +}
> > +
> >  static inline int acpi_dev_gpio_irq_get(struct acpi_device *adev, int index)
> >  {
> > -     return acpi_dev_gpio_irq_get_by(adev, NULL, index);
> > +     return acpi_dev_gpio_irq_wake_get_by(adev, NULL, index, NULL);
> > +}
>

> > +static inline int acpi_dev_gpio_irq_wake_get(struct acpi_device *adev,
> > +                                          int index, bool *wake_capable)
> > +{
> > +     return acpi_dev_gpio_irq_wake_get_by(adev, NULL, index, wake_capable);
> >  }
>
> I would put this first in the group of these three helpers, so irq_get_by and
> irq_get will be the last (from more parameters to less parameters).
>

Done

> >  /* Device properties */
> > --
> > 2.37.3.968.ga6b4b080e4-goog
> >
>
> --
> With Best Regards,
> Andy Shevchenko
>
>

Thanks for the review!