diff options
author | Lubomir Rintel <lkundrak@v3.sk> | 2022-01-07 12:08:09 +0100 |
---|---|---|
committer | Lubomir Rintel <lkundrak@v3.sk> | 2022-01-07 12:11:10 +0100 |
commit | 710656b444c7b601d5f02fc8c853477a48c63734 (patch) | |
tree | 9a77613b0c2ed5f9481d339a8f805dce4a435fd5 | |
parent | 3770333b3f8cb7c9110889853afaa49777c26ea7 (diff) | |
download | linux-lr/czc-p10t.tar.gz |
platform/x86: x86-android-tablets: Fix the buttons on CZC P10T tabletlr/czc-p10t
This switches the P10T tablet to "Android" mode, where the Home button
sends a single sancode instead of a Windows-specific key combination and
the other button doesn't disable the Wi-Fi.
Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
-rw-r--r-- | drivers/platform/x86/x86-android-tablets.c | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/drivers/platform/x86/x86-android-tablets.c b/drivers/platform/x86/x86-android-tablets.c index d39da5fca6c55..2a37785e66ad3 100644 --- a/drivers/platform/x86/x86-android-tablets.c +++ b/drivers/platform/x86/x86-android-tablets.c @@ -151,6 +151,7 @@ struct x86_dev_info { int i2c_client_count; int pdev_count; int serdev_count; + void (*fixup)(void); }; /* Generic / shared bq24190 settings */ @@ -614,6 +615,12 @@ static const struct x86_dev_info xiaomi_mipad2_info __initconst = { .i2c_client_count = ARRAY_SIZE(xiaomi_mipad2_i2c_clients), }; +static void __init x86_czc_p10t_fixup(void); + +static const struct x86_dev_info czc_p10t __initconst = { + .fixup = x86_czc_p10t_fixup, +}; + static const struct dmi_system_id x86_android_tablet_ids[] __initconst = { { /* Asus MeMO Pad 7 ME176C */ @@ -659,6 +666,24 @@ static const struct dmi_system_id x86_android_tablet_ids[] __initconst = { }, .driver_data = (void *)&xiaomi_mipad2_info, }, + { + /* CZC P10T */ + .ident = "CZC ODEON TPC-10 (\"P10T\")", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "CZC"), + DMI_MATCH(DMI_PRODUCT_NAME, "ODEON*TPC-10"), + }, + .driver_data = (void *)&czc_p10t, + }, + { + /* A variant of CZC P10T */ + .ident = "ViewSonic ViewPad 10", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "ViewSonic"), + DMI_MATCH(DMI_PRODUCT_NAME, "VPAD10"), + }, + .driver_data = (void *)&czc_p10t, + }, { } }; MODULE_DEVICE_TABLE(dmi, x86_android_tablet_ids); @@ -766,6 +791,34 @@ put_ctrl_adev: return ret; } +#define CZC_EC_EXTRA_PORT 0x68 +#define CZC_EC_ANDROID_KEYS 0x63 + +static void __init x86_czc_p10t_fixup(void) +{ + /* + * The device boots up in "Windows 7" mode, when the home button sends a + * Windows specific key sequence (Left Meta + D) and the second button + * sends an unknown one while also toggling the Radio Kill Switch. + * This is a surprising behavior when the second button is labeled "Back". + * + * The vendor-supplied Android-x86 build switches the device to a "Android" + * mode by writing value 0x63 to the I/O port 0x68. This just seems to just + * set bit 6 on address 0x96 in the EC region; switching the bit directly + * seems to achieve the same result. It uses a "p10t_switcher" to do the + * job. It doesn't seem to be able to do anything else, and no other use + * of the port 0x68 is known. + * + * In the Android mode, the home button sends just a single scancode, + * which can be handled in Linux userspace more reasonably and the back + * button only sends a scancode without toggling the kill switch. + * The scancode can then be mapped either to Back or RF Kill functionality + * in userspace, depending on how the button is labeled on that particular + * model. + */ + outb(CZC_EC_ANDROID_KEYS, CZC_EC_EXTRA_PORT); +} + static void x86_android_tablet_cleanup(void) { int i; @@ -857,6 +910,9 @@ static __init int x86_android_tablet_init(void) } } + if (dev_info->fixup) + dev_info->fixup(); + return 0; } |