.i2c_client_count = ARRAY_SIZE(chuwi_hi8_i2c_clients),
};
+#define CZC_EC_EXTRA_PORT 0x68
+#define CZC_EC_ANDROID_KEYS 0x63
+
+static int __init 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 = czc_p10t_init,
+};
+
/*
* Whitelabel (sold as various brands) TM800A550L tablets.
* These tablet's DSDT contains a whole bunch of bogus ACPI I2C devices
.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,
+ },
+ {
/* Whitelabel (sold as various brands) TM800A550L */
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"),