This driver 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. The driver also supports the ViewSonic ViewPad 10 which is almost identical to P10T. Complementary hwdb patch with the scan code mapping: https://github.com/systemd/systemd/commit/40a3078b.patch Signed-off-by: Lubomir Rintel <lkundrak@xxxxx> --- MAINTAINERS | 6 +++ drivers/platform/x86/Kconfig | 8 ++++ drivers/platform/x86/Makefile | 1 + drivers/platform/x86/czc-tablet.c | 80 +++++++++++++++++++++++++++++++ 4 files changed, 95 insertions(+) create mode 100644 drivers/platform/x86/czc-tablet.c diff --git a/MAINTAINERS b/MAINTAINERS index 07d1576fc766..64bd3f330f85 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -3979,6 +3979,12 @@ S: Supported F: drivers/input/touchscreen/cyttsp* F: include/linux/input/cyttsp.h +CZC TABLET DRIVER +M: Lubomir Rintel <lkundrak@xxxxx> +L: platform-driver-x86@xxxxxxxxxxxxxxx +S: Maintained +F: drivers/platform/x86/czc-tablet.c + D-LINK DIR-685 TOUCHKEYS DRIVER M: Linus Walleij <linus.walleij@xxxxxxxxxx> L: linux-input@xxxxxxxxxxxxxxx diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig index ac4d48830415..4ec8576129dc 100644 --- a/drivers/platform/x86/Kconfig +++ b/drivers/platform/x86/Kconfig @@ -1218,6 +1218,14 @@ config INTEL_CHTDC_TI_PWRBTN To compile this driver as a module, choose M here: the module will be called intel_chtdc_ti_pwrbtn. +config CZC_TABLET + tristate "CZC Tablet Extras" + help + This driver adds support for buttons on a CZC ODEON TPC-10 ("P10T") + and ViewSonic ViewPad 10 tablet computers. + + If you have an 10" CZC or ViewSonic tablet, say Y or M here. + endif # X86_PLATFORM_DEVICES config PMC_ATOM diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile index 2ba6cb795338..5cb772bbbfb6 100644 --- a/drivers/platform/x86/Makefile +++ b/drivers/platform/x86/Makefile @@ -47,6 +47,7 @@ obj-$(CONFIG_SURFACE3_WMI) += surface3-wmi.o obj-$(CONFIG_TOPSTAR_LAPTOP) += topstar-laptop.o obj-$(CONFIG_WMI_BMOF) += wmi-bmof.o obj-$(CONFIG_INTEL_WMI_THUNDERBOLT) += intel-wmi-thunderbolt.o +obj-$(CONFIG_CZC_TABLET) += czc-tablet.o # toshiba_acpi must link after wmi to ensure that wmi devices are found # before toshiba_acpi initializes diff --git a/drivers/platform/x86/czc-tablet.c b/drivers/platform/x86/czc-tablet.c new file mode 100644 index 000000000000..8ff94c4bfe43 --- /dev/null +++ b/drivers/platform/x86/czc-tablet.c @@ -0,0 +1,80 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * CZC Tablet Support + * + * Copyright (C) 2018 Lubomir Rintel <lkundrak@xxxxx> + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/dmi.h> + +static bool force; +module_param(force, bool, 0); +MODULE_PARM_DESC(force, "Disable the DMI check and force the driver to be loaded"); + +/* + * 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. + */ + +#define CZC_EC_EXTRA_PORT 0x68 + +#define CZC_EC_ANDROID_KEYS 0x63 + +static const struct dmi_system_id czc_tablet_table[] __initconst = { + { + .ident = "CZC ODEON TPC-10 (\"P10T\")", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "CZC"), + DMI_MATCH(DMI_PRODUCT_NAME, "ODEON*TPC-10"), + }, + }, + { + .ident = "ViewSonic ViewPad 10", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "ViewSonic"), + DMI_MATCH(DMI_PRODUCT_NAME, "VPAD10"), + }, + }, + { } +}; + +static int __init czc_tablet_init(void) +{ + if (!force && !dmi_check_system(czc_tablet_table)) + return -ENODEV; + + outb(CZC_EC_ANDROID_KEYS, CZC_EC_EXTRA_PORT); + + return 0; +} + +static void __exit czc_tablet_exit(void) +{ +} + +module_init(czc_tablet_init); +module_exit(czc_tablet_exit); + +MODULE_DEVICE_TABLE(dmi, czc_tablet_table); + +MODULE_AUTHOR("Lubomir Rintel <lkundrak@xxxxx>"); +MODULE_DESCRIPTION("CZC Tablet Support"); +MODULE_LICENSE("GPL"); -- 2.18.0
