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@xxxxx>
---
This applies on top of v5.16-rc8-792-gf3a343366741, commit
f3a3433667418e ("platform/x86: x86-android-tablets: Workaround Lenovo
Yoga Tablet 2 1050 poweroff hang) from
<https://github.com/jwrdegoede/linux-sunxi>.
drivers/platform/x86/x86-android-tablets.c | 51 ++++++++++++++++++++++
1 file changed, 51 insertions(+)
diff --git a/drivers/platform/x86/x86-android-tablets.c b/drivers/platform/x86/x86-android-tablets.c
index 9333bbec33e9..c3d0714b588a 100644
--- a/drivers/platform/x86/x86-android-tablets.c
+++ b/drivers/platform/x86/x86-android-tablets.c
@@ -776,6 +776,39 @@ static const struct x86_dev_info xiaomi_mipad2_info __initconst = {
.i2c_client_count = ARRAY_SIZE(xiaomi_mipad2_i2c_clients),
};
+#define CZC_EC_EXTRA_PORT 0x68
+#define CZC_EC_ANDROID_KEYS 0x63
+
+static int __init x86_czc_p10t_init(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);
+ return 0;
+}
+
+static const struct x86_dev_info czc_p10t __initconst = {
+ .init = x86_czc_p10t_init,
+};
+
static const struct dmi_system_id x86_android_tablet_ids[] __initconst = {
{
/* Asus MeMO Pad 7 ME176C */
@@ -803,6 +836,24 @@ static const struct dmi_system_id x86_android_tablet_ids[] __initconst = {
},
.driver_data = (void *)&chuwi_hi8_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,
+ },
{
/* Lenovo Yoga Tablet 1050F/L */
.matches = {
--
2.34.1
