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    Subject[PATCH V5 06/12] ACPI: introduce platform_id flag
    Date
    Only certain kind of ACPI device objects can be enumerated to platform bus.
    These ACPI device objects include
    1. ACPI device objects that have _HID control method.
    2. some ACPI device objects that have Linux specified HID strings.

    In order to distinguish those device objects from the others, a new flag
    platform_id and a new function acpi_add_platform_id() are introduced
    in this patch.

    Currently, only devices with _HID method have this flag set.
    If you want platform devices to be created for device objects without _HID,
    use acpi_add_platform_id() when adding artificial Linux-specific ID strings
    to them.

    Signed-off-by: Zhang Rui <rui.zhang@intel.com>
    ---
    drivers/acpi/scan.c | 9 ++++++++-
    include/acpi/acpi_bus.h | 3 ++-
    2 files changed, 10 insertions(+), 2 deletions(-)

    diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
    index c82ab73..451e7d9 100644
    --- a/drivers/acpi/scan.c
    +++ b/drivers/acpi/scan.c
    @@ -1730,6 +1730,13 @@ static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
    pnp->type.hardware_id = 1;
    }

    +static void acpi_add_platform_id(struct acpi_device_pnp *pnp,
    + const char *dev_id)
    +{
    + acpi_add_id(pnp, dev_id);
    + pnp->type.platform_id = 1;
    +}
    +
    /*
    * Old IBM workstations have a DSDT bug wherein the SMBus object
    * lacks the SMBUS01 HID and the methods do not have the necessary "_"
    @@ -1794,7 +1801,7 @@ static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
    }

    if (info->valid & ACPI_VALID_HID)
    - acpi_add_id(pnp, info->hardware_id.string);
    + acpi_add_platform_id(pnp, info->hardware_id.string);
    if (info->valid & ACPI_VALID_CID) {
    cid_list = &info->compatible_id_list;
    for (i = 0; i < cid_list->count; i++)
    diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
    index ba679af..ec92ad3 100644
    --- a/include/acpi/acpi_bus.h
    +++ b/include/acpi/acpi_bus.h
    @@ -233,7 +233,8 @@ struct acpi_hardware_id {
    struct acpi_pnp_type {
    u32 hardware_id:1;
    u32 bus_address:1;
    - u32 reserved:30;
    + u32 platform_id:1;
    + u32 reserved:29;
    };

    struct acpi_device_pnp {
    --
    1.7.9.5


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