linux-kernel - Re: [PATCH v3 2/4] ACPI: bus: Introduce acpi_match_acpi

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Message-ID: <CAJZ5v0jDO_ktnqg-2+iUt0UFRE-zYHdLHjWL3QfVD5syLF+d+w@mail.gmail.com>
Date:   Thu, 29 Jun 2023 10:44:57 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-i2c@...r.kernel.org, acpica-devel@...ts.linuxfoundation.org,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>,
        Andi Shyti <andi.shyti@...nel.org>,
        Robert Moore <robert.moore@...el.com>,
        Michael Walle <michael@...le.cc>
Subject: Re: [PATCH v3 2/4] ACPI: bus: Introduce acpi_match_acpi_device() helper

On Mon, Jun 26, 2023 at 1:00 PM Andy Shevchenko
<andriy.shevchenko@...ux.intel.com> wrote:
>
> In some cases we can't have a physical node associated with
> the ACPI device. Yet we want to match it against ID table and
> get respective driver data. Introduce the helper for that.

I think that the problem is really to find a struct acpi_device_id in
a given list matching a given struct acpi_device.

> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
>  drivers/acpi/bus.c   | 15 +++++++++++----
>  include/linux/acpi.h |  9 +++++++++
>  2 files changed, 20 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
> index 20cdfb37da79..ee88bfb60ac2 100644
> --- a/drivers/acpi/bus.c
> +++ b/drivers/acpi/bus.c
> @@ -850,6 +850,16 @@ static bool __acpi_match_device(const struct acpi_device *device,
>         return true;
>  }
>
> +const struct acpi_device_id *acpi_match_acpi_device(const struct acpi_device_id *ids,
> +                                                   const struct acpi_device *adev)
> +{
> +       const struct acpi_device_id *id = NULL;
> +
> +       __acpi_match_device(adev, ids, NULL, &id, NULL);
> +       return id;
> +}
> +EXPORT_SYMBOL_GPL(acpi_match_acpi_device);

This is fine, but it requires a kerneldoc comment (as an exported function).

Of course, the code in scan.c can use it even if it is not exported.

> +
>  /**
>   * acpi_match_device - Match a struct device against a given list of ACPI IDs
>   * @ids: Array of struct acpi_device_id object to match against.
> @@ -864,10 +874,7 @@ static bool __acpi_match_device(const struct acpi_device *device,
>  const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
>                                                const struct device *dev)
>  {
> -       const struct acpi_device_id *id = NULL;
> -
> -       __acpi_match_device(acpi_companion_match(dev), ids, NULL, &id, NULL);
> -       return id;
> +       return acpi_match_acpi_device(ids, acpi_companion_match(dev));
>  }
>  EXPORT_SYMBOL_GPL(acpi_match_device);
>
> diff --git a/include/linux/acpi.h b/include/linux/acpi.h
> index 640f1c07c894..641dc4843987 100644
> --- a/include/linux/acpi.h
> +++ b/include/linux/acpi.h
> @@ -707,6 +707,9 @@ extern int acpi_nvs_register(__u64 start, __u64 size);
>  extern int acpi_nvs_for_each_region(int (*func)(__u64, __u64, void *),
>                                     void *data);
>
> +const struct acpi_device_id *acpi_match_acpi_device(const struct acpi_device_id *ids,
> +                                                   const struct acpi_device *adev);
> +
>  const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
>                                                const struct device *dev);
>
> @@ -922,6 +925,12 @@ static inline int acpi_nvs_for_each_region(int (*func)(__u64, __u64, void *),
>
>  struct acpi_device_id;
>
> +static inline const struct acpi_device_id *acpi_match_acpi_device(
> +       const struct acpi_device_id *ids, const struct acpi_device *adev)
> +{
> +       return NULL;
> +}
> +
>  static inline const struct acpi_device_id *acpi_match_device(
>         const struct acpi_device_id *ids, const struct device *dev)
>  {
> --
> 2.40.0.1.gaa8946217a0b
>