On Tuesday, April 08, 2014 12:06:52 AM Zhang Rui wrote:
> For CMOS RTC devices, the acpi pnp scan handler does not work because
> there is already a cmos rtc scan handler installed, thus we need to
> check those devices and enumerate them to PNP bus explicitly.
> Plus, the cmos rtc scan handler needs to return 1 so that it will not
> be enumerated to platform bus.
>
> Note: the CMOS RTC device id is not removed from ACPI pnp scan handler
> id list, thus, if cmos rtc scan handler is compiled out, the ACPI
> pnp scan handler will be attached to the CMOS RTC devices instead,
> to prevent these devices from being created to platform bus.
>
> Signed-off-by: Zhang Rui <rui.zhang@xxxxxxxxx>
> ---
> drivers/acpi/acpi_cmos_rtc.c | 2 +-
> drivers/acpi/acpi_pnp.c | 22 +++++++++++++++++++++-
> 2 files changed, 22 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/acpi/acpi_cmos_rtc.c b/drivers/acpi/acpi_cmos_rtc.c
> index 961b45d..2da8660 100644
> --- a/drivers/acpi/acpi_cmos_rtc.c
> +++ b/drivers/acpi/acpi_cmos_rtc.c
> @@ -68,7 +68,7 @@ static int acpi_install_cmos_rtc_space_handler(struct acpi_device *adev,
> return -ENODEV;
> }
>
> - return 0;
> + return 1;
> }
>
> static void acpi_remove_cmos_rtc_space_handler(struct acpi_device *adev)
> diff --git a/drivers/acpi/acpi_pnp.c b/drivers/acpi/acpi_pnp.c
> index 8cf7d9d..387b150 100644
> --- a/drivers/acpi/acpi_pnp.c
> +++ b/drivers/acpi/acpi_pnp.c
> @@ -349,9 +349,29 @@ static struct acpi_scan_handler acpi_pnp_handler = {
> .attach = acpi_pnp_scan_handler_attach,
> };
>
> +/*
> + * For CMOS RTC devices, the acpi pnp spcan handler does not work because
> + * there is already a cmos rtc scan handler installed, thus we need to
> + * check those devices and enumerate them to PNP bus explicitly.
> + */
> +static int is_cmos_rtc_device(struct acpi_device *adev)
> +{
> + struct acpi_device_id ids[] = {
> + { "PNP0B00" },
> + { "PNP0B01" },
> + { "PNP0B02" },
> + {""},
> + };
> + return !acpi_match_device_ids(adev, ids);
> +}
> +
> bool acpi_is_pnp_device(struct acpi_device *device)
> {
> - return device->handler == &acpi_pnp_handler;
> + if (device->handler == &acpi_pnp_handler)
> + return true;
> + if (is_cmos_rtc_device(device))
> + return true;
> + return false;
What about doing
return device->handler == &acpi_pnp_handler || is_cmos_rtc_device(device);
instead?
> }
> EXPORT_SYMBOL_GPL(acpi_is_pnp_device);
>
>
--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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