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SubjectRe: [PATCH] thinkpad_acpi: Implement tablet mode resolving using GMMS method
On Fri, 15 Sep 2017, Benjamin Berg wrote:
> Many thinkpad laptops and convertibles provide the GMMS method to
> resolve how far the laptop has been opened and whether it has been
> converted into tablet mode. This allows reporting a more precise tablet
> mode state to userspace.
>
> The current implementation only reports a summarized tablet mode state
> which is triggered as soon as the input devices become unusable as they
> are folded away from the display.
>
> This will work on all models where the CMMD method was used previously and
> it may also work in other cases.
>
> Thanks to Peter Zhang of Lenovo for providing information on how to use the
> GMMS method to query the tablet mode.
>
> Signed-off-by: Benjamin Berg <bberg@redhat.com>
> Cc: Peter FP1 Zhang <zhangfp1@lenovo.com>
> Cc: Lyude Paul <lyude@redhat.com>

Looks good.

Acked-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>

---
PS: please send me the documentation for CMMD/GMMS off-list.

> ---
> drivers/platform/x86/thinkpad_acpi.c | 132 +++++++++++++++++++++++++++++++----
> 1 file changed, 119 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
> index 2242d6035d9e..91fab1a13a6d 100644
> --- a/drivers/platform/x86/thinkpad_acpi.c
> +++ b/drivers/platform/x86/thinkpad_acpi.c
> @@ -310,8 +310,7 @@ static struct {
> enum {
> TP_HOTKEY_TABLET_NONE = 0,
> TP_HOTKEY_TABLET_USES_MHKG,
> - /* X1 Yoga 2016, seen on BIOS N1FET44W */
> - TP_HOTKEY_TABLET_USES_CMMD,
> + TP_HOTKEY_TABLET_USES_GMMS,
> } hotkey_tablet;
> u32 kbdlight:1;
> u32 light:1;
> @@ -2044,8 +2043,28 @@ static void hotkey_poll_setup(const bool may_warn);
>
> /* HKEY.MHKG() return bits */
> #define TP_HOTKEY_TABLET_MASK (1 << 3)
> -/* ThinkPad X1 Yoga (2016) */
> -#define TP_EC_CMMD_TABLET_MODE 0x6
> +enum {
> + TP_ACPI_MULTI_MODE_INVALID = 0,
> + TP_ACPI_MULTI_MODE_UNKNOWN = 1 << 0,
> + TP_ACPI_MULTI_MODE_LAPTOP = 1 << 1,
> + TP_ACPI_MULTI_MODE_TABLET = 1 << 2,
> + TP_ACPI_MULTI_MODE_FLAT = 1 << 3,
> + TP_ACPI_MULTI_MODE_STAND = 1 << 4,
> + TP_ACPI_MULTI_MODE_TENT = 1 << 5,
> + TP_ACPI_MULTI_MODE_STAND_TENT = 1 << 6,
> +};
> +
> +enum {
> + /* The following modes are considered tablet mode for the purpose of
> + * reporting the status to userspace. i.e. in all these modes it makes
> + * sense to disable the laptop input devices such as touchpad and
> + * keyboard.
> + */
> + TP_ACPI_MULTI_MODE_TABLET_LIKE = TP_ACPI_MULTI_MODE_TABLET |
> + TP_ACPI_MULTI_MODE_STAND |
> + TP_ACPI_MULTI_MODE_TENT |
> + TP_ACPI_MULTI_MODE_STAND_TENT,
> +};
>
> static int hotkey_get_wlsw(void)
> {
> @@ -2066,6 +2085,90 @@ static int hotkey_get_wlsw(void)
> return (status) ? TPACPI_RFK_RADIO_ON : TPACPI_RFK_RADIO_OFF;
> }
>
> +static int hotkey_gmms_get_tablet_mode(int s, int *has_tablet_mode)
> +{
> + int type = (s >> 16) & 0xffff;
> + int value = s & 0xffff;
> + int mode = TP_ACPI_MULTI_MODE_INVALID;
> + int valid_modes = 0;
> +
> + if (has_tablet_mode)
> + *has_tablet_mode = 0;
> +
> + switch (type) {
> + case 1:
> + valid_modes = TP_ACPI_MULTI_MODE_LAPTOP |
> + TP_ACPI_MULTI_MODE_TABLET |
> + TP_ACPI_MULTI_MODE_STAND_TENT;
> + break;
> + case 2:
> + valid_modes = TP_ACPI_MULTI_MODE_LAPTOP |
> + TP_ACPI_MULTI_MODE_FLAT |
> + TP_ACPI_MULTI_MODE_TABLET |
> + TP_ACPI_MULTI_MODE_STAND |
> + TP_ACPI_MULTI_MODE_TENT;
> + break;
> + case 3:
> + valid_modes = TP_ACPI_MULTI_MODE_LAPTOP |
> + TP_ACPI_MULTI_MODE_FLAT;
> + break;
> + case 4:
> + valid_modes = TP_ACPI_MULTI_MODE_LAPTOP |
> + TP_ACPI_MULTI_MODE_TABLET |
> + TP_ACPI_MULTI_MODE_STAND |
> + TP_ACPI_MULTI_MODE_TENT;
> + break;
> + case 5:
> + valid_modes = TP_ACPI_MULTI_MODE_LAPTOP |
> + TP_ACPI_MULTI_MODE_FLAT |
> + TP_ACPI_MULTI_MODE_TABLET |
> + TP_ACPI_MULTI_MODE_STAND |
> + TP_ACPI_MULTI_MODE_TENT;
> + break;
> + default:
> + pr_err("Unknown multi mode status type %d with value 0x%04X, please report this to %s\n",
> + type, value, TPACPI_MAIL);
> + return 0;
> + }
> +
> + if (has_tablet_mode && (valid_modes & TP_ACPI_MULTI_MODE_TABLET_LIKE))
> + *has_tablet_mode = 1;
> +
> + switch (value) {
> + case 1:
> + mode = TP_ACPI_MULTI_MODE_LAPTOP;
> + break;
> + case 2:
> + mode = TP_ACPI_MULTI_MODE_FLAT;
> + break;
> + case 3:
> + mode = TP_ACPI_MULTI_MODE_TABLET;
> + break;
> + case 4:
> + if (type == 1)
> + mode = TP_ACPI_MULTI_MODE_STAND_TENT;
> + else
> + mode = TP_ACPI_MULTI_MODE_STAND;
> + break;
> + case 5:
> + mode = TP_ACPI_MULTI_MODE_TENT;
> + break;
> + default:
> + if (type == 5 && value == 0xffff) {
> + pr_warn("Multi mode status is undetected, assuming laptop\n");
> + return 0;
> + }
> + }
> +
> + if (!(mode & valid_modes)) {
> + pr_err("Unknown/reserved multi mode value 0x%04X for type %d, please report this to %s\n",
> + value, type, TPACPI_MAIL);
> + return 0;
> + }
> +
> + return !!(mode & TP_ACPI_MULTI_MODE_TABLET_LIKE);
> +}
> +
> static int hotkey_get_tablet_mode(int *status)
> {
> int s;
> @@ -2077,11 +2180,11 @@ static int hotkey_get_tablet_mode(int *status)
>
> *status = ((s & TP_HOTKEY_TABLET_MASK) != 0);
> break;
> - case TP_HOTKEY_TABLET_USES_CMMD:
> - if (!acpi_evalf(ec_handle, &s, "CMMD", "d"))
> + case TP_HOTKEY_TABLET_USES_GMMS:
> + if (!acpi_evalf(hkey_handle, &s, "GMMS", "dd", 0))
> return -EIO;
>
> - *status = (s == TP_EC_CMMD_TABLET_MODE);
> + *status = hotkey_gmms_get_tablet_mode(s, NULL);
> break;
> default:
> break;
> @@ -3113,16 +3216,19 @@ static int hotkey_init_tablet_mode(void)
> int in_tablet_mode = 0, res;
> char *type = NULL;
>
> - if (acpi_evalf(hkey_handle, &res, "MHKG", "qd")) {
> + if (acpi_evalf(hkey_handle, &res, "GMMS", "qdd", 0)) {
> + int has_tablet_mode;
> +
> + in_tablet_mode = hotkey_gmms_get_tablet_mode(res,
> + &has_tablet_mode);
> + if (has_tablet_mode)
> + tp_features.hotkey_tablet = TP_HOTKEY_TABLET_USES_GMMS;
> + type = "GMMS";
> + } else if (acpi_evalf(hkey_handle, &res, "MHKG", "qd")) {
> /* For X41t, X60t, X61t Tablets... */
> tp_features.hotkey_tablet = TP_HOTKEY_TABLET_USES_MHKG;
> in_tablet_mode = !!(res & TP_HOTKEY_TABLET_MASK);
> type = "MHKG";
> - } else if (acpi_evalf(ec_handle, &res, "CMMD", "qd")) {
> - /* For X1 Yoga (2016) */
> - tp_features.hotkey_tablet = TP_HOTKEY_TABLET_USES_CMMD;
> - in_tablet_mode = res == TP_EC_CMMD_TABLET_MODE;
> - type = "CMMD";
> }
>
> if (!tp_features.hotkey_tablet)

--
Henrique Holschuh

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