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    Subject[PATCH v4 2/3] platform/x86: dell-*: Add interface for switchable graphics status query
    Date
    On some Dell platforms, there's a BIOS option "Enable Switchable
    Graphics". This information is useful if we want to do different things
    based on this value, e.g. disable unused audio controller that comes
    with the discrete graphics.

    Cc: Mario Limonciello <mario.limonciello@dell.com>
    Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
    ---
    v4: Change the commit message to clarify there's no more runtime pm
    warning.
    Also skip the check for thunderbolt attached devices.

    v3: Simplify dell_switchable_gfx_is_enabled() by returning bool instead
    of error code.
    Use DMI_DEV_TYPE_OEM_STRING to match Dell System.

    v2: Mario suggested to squash the HDA part into the same series.

    drivers/platform/x86/dell-laptop.c | 17 +++++++++++++++++
    drivers/platform/x86/dell-smbios-base.c | 2 ++
    drivers/platform/x86/dell-smbios.h | 2 ++
    include/linux/dell-common.h | 1 +
    4 files changed, 22 insertions(+)

    diff --git a/drivers/platform/x86/dell-laptop.c b/drivers/platform/x86/dell-laptop.c
    index 8ba820e6c3d0..033a27b190cc 100644
    --- a/drivers/platform/x86/dell-laptop.c
    +++ b/drivers/platform/x86/dell-laptop.c
    @@ -2116,6 +2116,23 @@ int dell_micmute_led_set(int state)
    }
    EXPORT_SYMBOL_GPL(dell_micmute_led_set);

    +bool dell_switchable_gfx_is_enabled(void)
    +{
    + struct calling_interface_buffer buffer;
    + struct calling_interface_token *token;
    +
    + token = dell_smbios_find_token(SWITCHABLE_GRAPHICS_ENABLE);
    + if (!token)
    + return false;
    +
    + dell_fill_request(&buffer, token->location, 0, 0, 0);
    + if (dell_send_request(&buffer, CLASS_TOKEN_READ, SELECT_TOKEN_STD))
    + return false;
    +
    + return !!buffer.output[1];
    +}
    +EXPORT_SYMBOL_GPL(dell_switchable_gfx_is_enabled);
    +
    static int __init dell_init(void)
    {
    struct calling_interface_token *token;
    diff --git a/drivers/platform/x86/dell-smbios-base.c b/drivers/platform/x86/dell-smbios-base.c
    index 33fb2a20458a..881ce42f0ca7 100644
    --- a/drivers/platform/x86/dell-smbios-base.c
    +++ b/drivers/platform/x86/dell-smbios-base.c
    @@ -86,6 +86,8 @@ struct token_range {
    static struct token_range token_whitelist[] = {
    /* used by userspace: fwupdate */
    {CAP_SYS_ADMIN, CAPSULE_EN_TOKEN, CAPSULE_DIS_TOKEN},
    + /* can indicate to userspace Switchable Graphics enable status */
    + {CAP_SYS_ADMIN, SWITCHABLE_GRAPHICS_ENABLE, SWITCHABLE_GRAPHICS_DISABLE},
    /* can indicate to userspace that WMI is needed */
    {0x0000, WSMT_EN_TOKEN, WSMT_DIS_TOKEN}
    };
    diff --git a/drivers/platform/x86/dell-smbios.h b/drivers/platform/x86/dell-smbios.h
    index d8adaf959740..7863e6a7cff8 100644
    --- a/drivers/platform/x86/dell-smbios.h
    +++ b/drivers/platform/x86/dell-smbios.h
    @@ -37,6 +37,8 @@
    #define KBD_LED_AUTO_100_TOKEN 0x02F6
    #define GLOBAL_MIC_MUTE_ENABLE 0x0364
    #define GLOBAL_MIC_MUTE_DISABLE 0x0365
    +#define SWITCHABLE_GRAPHICS_ENABLE 0x037A
    +#define SWITCHABLE_GRAPHICS_DISABLE 0x037B

    struct notifier_block;

    diff --git a/include/linux/dell-common.h b/include/linux/dell-common.h
    index 37e4b614dd74..1a90bc9a3bea 100644
    --- a/include/linux/dell-common.h
    +++ b/include/linux/dell-common.h
    @@ -3,5 +3,6 @@
    #define __DELL_COMMON_H__

    int dell_micmute_led_set(int on);
    +bool dell_switchable_gfx_is_enabled(void);

    #endif
    --
    2.17.0
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