On Fri, Sep 28, 2012 at 03:38:30PM +0800, Zhang Rui wrote:
> >From 72df5d1f51fb27a4ba7f70a3b07df759d32b8288 Mon Sep 17 00:00:00 2001
> From: Zhang Rui <rui.zhang@xxxxxxxxx>
> Date: Thu, 27 Sep 2012 15:11:55 +0800
> Subject: [RFC PATCH 1/6] Introduce acpi_match_device_id().
>
> This API is used to check if a device id string is compatible
> with an ACPI device,
> either PNP id exported via _HID or compatible ids exported
> via _CID control method.
>
> Signed-off-by: Zhang Rui <rui.zhang@xxxxxxxxx>
> ---
> drivers/acpi/scan.c | 22 ++++++++++++++++++++++
> include/acpi/acpi_bus.h | 6 ++++++
> 2 files changed, 28 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
> index d1ecca2..936a7c9 100644
> --- a/drivers/acpi/scan.c
> +++ b/drivers/acpi/scan.c
> @@ -312,6 +312,28 @@ int acpi_match_device_ids(struct acpi_device *device,
> }
> EXPORT_SYMBOL(acpi_match_device_ids);
>
> +int acpi_match_device_id(const struct device *dev, const char *id)
Would be good idea to implement this in terms of of_match_device() so that
it returns pointer to the matched id. This way drivers can get the
->driver_data pretty easily if needed.
> +{
> + acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
If the device is not bound to an ACPI handle this will return NULL. And I
don't see you doing that in this series meaning that..
> + struct acpi_device *device;
> + struct acpi_hardware_id *hwid;
> + acpi_status status;
> +
> + if (!handle || !id)
> + return -ENODEV;
..you always return -ENODEV here, right?
> +
> + status = acpi_bus_get_device(handle, &device);
> + if (ACPI_FAILURE(status))
> + return -ENODEV;
> +
> + list_for_each_entry(hwid, &device->pnp.ids, list)
> + if (!strcmp(id, hwid->id))
> + return 0;
> +
> + return -ENODEV;
> +}
> +EXPORT_SYMBOL(acpi_match_device_id);
