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platform/x86: thinkpad_acpi: Add support for X1 Yoga (2016) Tablet Mode 

For whatever reason, the X1 Yoga doesn't support the normal method of
querying for tablet mode. Instead of providing the MHKG method under the
hotkey handle, we're instead given the CMMD method under the EC handle.
Values on this handle are either 0x1, laptop mode, or 0x6, tablet mode.

Tested-by: Daniel Martin <consume.noise@gmail.com>
Signed-off-by: Lyude <lyude@redhat.com>
Signed-off-by: Darren Hart <dvhart@linux.intel.com>
zero-colors
Lyude 2016-11-11 15:15:03 -05:00 committed by Darren Hart
parent b318002838
commit b03f4d4946
2 changed files with 36 additions and 4 deletions
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1
Documentation/laptops/thinkpad-acpi.txt
View File

@ -540,6 +540,7 @@ Events that are propagated by the driver to userspace:
0x6022 ALARM: a sensor is extremely hot
0x6030 System thermal table changed
0x6040 Nvidia Optimus/AC adapter related (TO BE VERIFIED)
0x60C0 X1 Yoga 2016, Tablet mode status changed
Battery nearly empty alarms are a last resort attempt to get the
operating system to hibernate or shutdown cleanly (0x2313), or shutdown

39
drivers/platform/x86/thinkpad_acpi.c
View File

@ -190,6 +190,9 @@ enum tpacpi_hkey_event_t {
TP_HKEY_EV_LID_OPEN = 0x5002, /* laptop lid opened */
TP_HKEY_EV_TABLET_TABLET = 0x5009, /* tablet swivel up */
TP_HKEY_EV_TABLET_NOTEBOOK = 0x500a, /* tablet swivel down */
TP_HKEY_EV_TABLET_CHANGED = 0x60c0, /* X1 Yoga (2016):
* enter/leave tablet mode
*/
TP_HKEY_EV_PEN_INSERTED = 0x500b, /* tablet pen inserted */
TP_HKEY_EV_PEN_REMOVED = 0x500c, /* tablet pen removed */
TP_HKEY_EV_BRGHT_CHANGED = 0x5010, /* backlight control event */
@ -305,6 +308,8 @@ 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,
} hotkey_tablet;
u32 kbdlight:1;
u32 light:1;
@ -2062,6 +2067,8 @@ 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
static int hotkey_get_wlsw(void)
{
@ -2086,10 +2093,23 @@ static int hotkey_get_tablet_mode(int *status)
{
int s;
if (!acpi_evalf(hkey_handle, &s, "MHKG", "d"))
return -EIO;
switch (tp_features.hotkey_tablet) {
case TP_HOTKEY_TABLET_USES_MHKG:
if (!acpi_evalf(hkey_handle, &s, "MHKG", "d"))
return -EIO;
*status = ((s & TP_HOTKEY_TABLET_MASK) != 0);
break;
case TP_HOTKEY_TABLET_USES_CMMD:
if (!acpi_evalf(ec_handle, &s, "CMMD", "d"))
return -EIO;
*status = (s == TP_EC_CMMD_TABLET_MODE);
break;
default:
break;
}
*status = ((s & TP_HOTKEY_TABLET_MASK) != 0);
return 0;
}
@ -3125,11 +3145,16 @@ static int hotkey_init_tablet_mode(void)
int in_tablet_mode, res;
char *type;
/* For X41t, X60t, X61t Tablets... */
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)
@ -3921,6 +3946,12 @@ static bool hotkey_notify_6xxx(const u32 hkey,
*ignore_acpi_ev = true;
return true;
case TP_HKEY_EV_TABLET_CHANGED:
tpacpi_input_send_tabletsw();
hotkey_tablet_mode_notify_change();
*send_acpi_ev = false;
break;
default:
pr_warn("unknown possible thermal alarm or keyboard event received\n");
known = false;