On ACPI based tablets, the ACPI touchscreen node only contains info on the gpio and the irq, and is missing any info on the axis. This info is expected to be built into the tablet model specific version of the driver shipped with the os-image for the device. Add support for getting the missing info from a table built into the driver, using dmi data to identify which entry of the table to use and add info for the CUBE iwork8 Air and Jumper EZpad mini3 tablets on which this code was tested / developed. BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=187531 Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx> [dmitry.torokhov@xxxxxxxxx: Move to platform/x86] Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx> Acked-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx> --- Changes in v2: -Put the dmi code in a separate silead_dmi.c file -Use device_add_properties to add the info Changes in v3 (Dmitry Torokhov): -Move the silead_dmi code to drivers/platform/x86 Changes in v4: -Minor spelling and code-style fixes based on review from Andy Shevchenko Changes in v5: -Use has_acpi_companion() -Drop .ident from dmi_id structs, it is not used --- MAINTAINERS | 8 +++ drivers/platform/x86/Kconfig | 11 +++ drivers/platform/x86/Makefile | 1 + drivers/platform/x86/silead_dmi.c | 136 ++++++++++++++++++++++++++++++++++++++ 4 files changed, 156 insertions(+) create mode 100644 drivers/platform/x86/silead_dmi.c diff --git a/MAINTAINERS b/MAINTAINERS index f1ab2c6..0953284 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -11261,6 +11261,14 @@ F: drivers/media/usb/siano/ F: drivers/media/usb/siano/ F: drivers/media/mmc/siano/ +SILEAD TOUCHSCREEN DRIVER +M: Hans de Goede <hdegoede@xxxxxxxxxx> +L: linux-input@xxxxxxxxxxxxxxx +L: platform-driver-x86@xxxxxxxxxxxxxxx +S: Maintained +F: drivers/input/touchscreen/silead.c +F: drivers/platform/x86/silead_dmi.c + SIMPLEFB FB DRIVER M: Hans de Goede <hdegoede@xxxxxxxxxx> L: linux-fbdev@xxxxxxxxxxxxxxx diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig index 59aa8e3..03e5347 100644 --- a/drivers/platform/x86/Kconfig +++ b/drivers/platform/x86/Kconfig @@ -1076,4 +1076,15 @@ config MLX_CPLD_PLATFORM This driver handles hot-plug events for the power suppliers, power cables and fans on the wide range Mellanox IB and Ethernet systems. +config SILEAD_DMI + bool "Tablets with Silead touchscreens" + depends on ACPI && DMI && I2C && INPUT + ---help--- + Certain ACPI based tablets with Silead touchscreens do not have + enough data in ACPI tables for the touchscreen driver to handle + the touchscreen properly, as OEMs expected the data to be baked + into the tablet model specific version of the driver shipped + with the OS-image for the device. This option supplies the missing + information. Enable this for x86 tablets with Silead touchscreens. + endif # X86_PLATFORM_DEVICES diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile index d4111f0..840b07b 100644 --- a/drivers/platform/x86/Makefile +++ b/drivers/platform/x86/Makefile @@ -76,3 +76,4 @@ obj-$(CONFIG_INTEL_TELEMETRY) += intel_telemetry_core.o \ obj-$(CONFIG_INTEL_PMC_CORE) += intel_pmc_core.o obj-$(CONFIG_MLX_PLATFORM) += mlx-platform.o obj-$(CONFIG_MLX_CPLD_PLATFORM) += mlxcpld-hotplug.o +obj-$(CONFIG_SILEAD_DMI) += silead_dmi.o diff --git a/drivers/platform/x86/silead_dmi.c b/drivers/platform/x86/silead_dmi.c new file mode 100644 index 0000000..02e11fd --- /dev/null +++ b/drivers/platform/x86/silead_dmi.c @@ -0,0 +1,136 @@ +/* + * Silead touchscreen driver DMI based configuration code + * + * Copyright (c) 2017 Red Hat Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * Red Hat authors: + * Hans de Goede <hdegoede@xxxxxxxxxx> + */ + +#include <linux/acpi.h> +#include <linux/device.h> +#include <linux/dmi.h> +#include <linux/i2c.h> +#include <linux/notifier.h> +#include <linux/property.h> +#include <linux/string.h> + +struct silead_ts_dmi_data { + const char *acpi_name; + struct property_entry *properties; +}; + +static struct property_entry cube_iwork8_air_props[] = { + PROPERTY_ENTRY_U32("touchscreen-size-x", 1660), + PROPERTY_ENTRY_U32("touchscreen-size-y", 900), + PROPERTY_ENTRY_BOOL("touchscreen-swapped-x-y"), + PROPERTY_ENTRY_STRING("firmware-name", "gsl3670-cube-iwork8-air.fw"), + PROPERTY_ENTRY_U32("silead,max-fingers", 10), + { } +}; + +static const struct silead_ts_dmi_data cube_iwork8_air_data = { + .acpi_name = "MSSL1680:00", + .properties = cube_iwork8_air_props, +}; + +static struct property_entry jumper_ezpad_mini3_props[] = { + PROPERTY_ENTRY_U32("touchscreen-size-x", 1700), + PROPERTY_ENTRY_U32("touchscreen-size-y", 1150), + PROPERTY_ENTRY_BOOL("touchscreen-swapped-x-y"), + PROPERTY_ENTRY_STRING("firmware-name", "gsl3676-jumper-ezpad-mini3.fw"), + PROPERTY_ENTRY_U32("silead,max-fingers", 10), + { } +}; + +static const struct silead_ts_dmi_data jumper_ezpad_mini3_data = { + .acpi_name = "MSSL1680:00", + .properties = jumper_ezpad_mini3_props, +}; + +static const struct dmi_system_id silead_ts_dmi_table[] = { + { + /* CUBE iwork8 Air */ + .driver_data = (void *)&cube_iwork8_air_data, + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "cube"), + DMI_MATCH(DMI_PRODUCT_NAME, "i1-TF"), + DMI_MATCH(DMI_BOARD_NAME, "Cherry Trail CR"), + }, + }, + { + /* Jumper EZpad mini3 */ + .driver_data = (void *)&jumper_ezpad_mini3_data, + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Insyde"), + /* jumperx.T87.KFBNEEA02 with the version-nr dropped */ + DMI_MATCH(DMI_BIOS_VERSION, "jumperx.T87.KFBNEEA"), + }, + }, + { }, +}; + +static void silead_ts_dmi_add_props(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + const struct dmi_system_id *dmi_id; + const struct silead_ts_dmi_data *ts_data; + int error; + + dmi_id = dmi_first_match(silead_ts_dmi_table); + if (!dmi_id) + return; + + ts_data = dmi_id->driver_data; + if (has_acpi_companion(dev) && + !strncmp(ts_data->acpi_name, client->name, I2C_NAME_SIZE)) { + error = device_add_properties(dev, ts_data->properties); + if (error) + dev_err(dev, "failed to add properties: %d\n", error); + } +} + +static int silead_ts_dmi_notifier_call(struct notifier_block *nb, + unsigned long action, void *data) +{ + struct device *dev = data; + + switch (action) { + case BUS_NOTIFY_ADD_DEVICE: + silead_ts_dmi_add_props(dev); + break; + + default: + break; + } + + return 0; +} + +static struct notifier_block silead_ts_dmi_notifier = { + .notifier_call = silead_ts_dmi_notifier_call, +}; + +static int __init silead_ts_dmi_init(void) +{ + int error; + + error = bus_register_notifier(&i2c_bus_type, &silead_ts_dmi_notifier); + if (error) + pr_err("%s: failed to register i2c bus notifier: %d\n", + __func__, error); + + return error; +} + +/* + * We are registering out notifier after i2c core is initialized and i2c bus + * itself is ready (which happens at postcore initcall level), but before + * ACPI starts enumerating devices (at subsys initcall level). + */ +arch_initcall(silead_ts_dmi_init); -- 2.9.3
