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fdc6b21e24
Add a driver to implement the Type C connector class for Chrome OS devices with ECs (Embedded Controllers). The driver relies on firmware device specifications for various port attributes. On ACPI platforms, this is specified using the logical device with HID GOOG0014. On DT platforms, this is specified using the DT node with compatible string "google,cros-ec-typec". The driver reads the device FW node and uses the port attributes to register the typec ports with the Type C connector class framework, but doesn't do much else. Subsequent patches will add more functionality to the driver, including obtaining current port information (polarity, vconn role, current power role etc.) after querying the EC. Co-developed-by: Benson Leung <bleung@chromium.org> Signed-off-by: Prashant Malani <pmalani@chromium.org> Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
257 lines
8.1 KiB
Plaintext
257 lines
8.1 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0-only
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#
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# Platform support for Chrome OS hardware (Chromebooks and Chromeboxes)
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#
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config MFD_CROS_EC
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tristate "Platform support for Chrome hardware (transitional)"
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select CHROME_PLATFORMS
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select CROS_EC
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select MFD_CROS_EC_DEV
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depends on X86 || ARM || ARM64 || COMPILE_TEST
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help
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This is a transitional Kconfig option and will be removed after
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everyone enables the parts individually.
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menuconfig CHROME_PLATFORMS
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bool "Platform support for Chrome hardware"
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depends on X86 || ARM || ARM64 || COMPILE_TEST
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---help---
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Say Y here to get to see options for platform support for
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various Chromebooks and Chromeboxes. This option alone does
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not add any kernel code.
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If you say N, all options in this submenu will be skipped and disabled.
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if CHROME_PLATFORMS
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config CHROMEOS_LAPTOP
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tristate "Chrome OS Laptop"
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depends on I2C && DMI && X86
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---help---
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This driver instantiates i2c and smbus devices such as
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light sensors and touchpads.
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If you have a supported Chromebook, choose Y or M here.
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The module will be called chromeos_laptop.
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config CHROMEOS_PSTORE
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tristate "Chrome OS pstore support"
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depends on X86
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---help---
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This module instantiates the persistent storage on x86 ChromeOS
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devices. It can be used to store away console logs and crash
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information across reboots.
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The range of memory used is 0xf00000-0x1000000, traditionally
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the memory used to back VGA controller memory.
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If you have a supported Chromebook, choose Y or M here.
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The module will be called chromeos_pstore.
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config CHROMEOS_TBMC
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tristate "ChromeOS Tablet Switch Controller"
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depends on ACPI
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depends on INPUT
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help
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This option adds a driver for the tablet switch on
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select Chrome OS systems.
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To compile this driver as a module, choose M here: the
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module will be called chromeos_tbmc.
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config CROS_EC
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tristate "ChromeOS Embedded Controller"
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select CROS_EC_PROTO
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depends on X86 || ARM || ARM64 || COMPILE_TEST
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help
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If you say Y here you get support for the ChromeOS Embedded
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Controller (EC) providing keyboard, battery and power services.
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You also need to enable the driver for the bus you are using. The
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protocol for talking to the EC is defined by the bus driver.
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To compile this driver as a module, choose M here: the
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module will be called cros_ec.
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config CROS_EC_I2C
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tristate "ChromeOS Embedded Controller (I2C)"
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depends on CROS_EC && I2C
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help
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If you say Y here, you get support for talking to the ChromeOS
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EC through an I2C bus. This uses a simple byte-level protocol with
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a checksum. Failing accesses will be retried three times to
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improve reliability.
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config CROS_EC_RPMSG
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tristate "ChromeOS Embedded Controller (rpmsg)"
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depends on CROS_EC && RPMSG && OF
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help
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If you say Y here, you get support for talking to the ChromeOS EC
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through rpmsg. This uses a simple byte-level protocol with a
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checksum. Also since there's no addition EC-to-host interrupt, this
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use a byte in message to distinguish host event from host command.
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To compile this driver as a module, choose M here: the
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module will be called cros_ec_rpmsg.
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config CROS_EC_ISHTP
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tristate "ChromeOS Embedded Controller (ISHTP)"
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depends on CROS_EC
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depends on INTEL_ISH_HID
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help
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If you say Y here, you get support for talking to the ChromeOS EC
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firmware running on Intel Integrated Sensor Hub (ISH), using the
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ISH Transport protocol (ISH-TP). This uses a simple byte-level
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protocol with a checksum.
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To compile this driver as a module, choose M here: the
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module will be called cros_ec_ishtp.
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config CROS_EC_SPI
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tristate "ChromeOS Embedded Controller (SPI)"
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depends on CROS_EC && SPI
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---help---
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If you say Y here, you get support for talking to the ChromeOS EC
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through a SPI bus, using a byte-level protocol. Since the EC's
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response time cannot be guaranteed, we support ignoring
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'pre-amble' bytes before the response actually starts.
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config CROS_EC_LPC
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tristate "ChromeOS Embedded Controller (LPC)"
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depends on CROS_EC && ACPI && (X86 || COMPILE_TEST)
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help
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If you say Y here, you get support for talking to the ChromeOS EC
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over an LPC bus, including the LPC Microchip EC (MEC) variant.
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This uses a simple byte-level protocol with a checksum. This is
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used for userspace access only. The kernel typically has its own
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communication methods.
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To compile this driver as a module, choose M here: the
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module will be called cros_ec_lpcs.
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config CROS_EC_PROTO
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bool
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help
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ChromeOS EC communication protocol helpers.
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config CROS_KBD_LED_BACKLIGHT
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tristate "Backlight LED support for Chrome OS keyboards"
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depends on LEDS_CLASS && ACPI
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help
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This option enables support for the keyboard backlight LEDs on
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select Chrome OS systems.
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To compile this driver as a module, choose M here: the
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module will be called cros_kbd_led_backlight.
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config CROS_EC_CHARDEV
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tristate "ChromeOS EC miscdevice"
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depends on MFD_CROS_EC_DEV
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default MFD_CROS_EC_DEV
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help
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This driver adds file operations support to talk with the
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ChromeOS EC from userspace via a character device.
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To compile this driver as a module, choose M here: the
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module will be called cros_ec_chardev.
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config CROS_EC_LIGHTBAR
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tristate "Chromebook Pixel's lightbar support"
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depends on MFD_CROS_EC_DEV
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default MFD_CROS_EC_DEV
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help
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This option exposes the Chromebook Pixel's lightbar to
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userspace.
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To compile this driver as a module, choose M here: the
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module will be called cros_ec_lightbar.
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config CROS_EC_VBC
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tristate "ChromeOS EC vboot context support"
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depends on MFD_CROS_EC_DEV && OF
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default MFD_CROS_EC_DEV
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help
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This option exposes the ChromeOS EC vboot context nvram to
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userspace.
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To compile this driver as a module, choose M here: the
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module will be called cros_ec_vbc.
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config CROS_EC_DEBUGFS
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tristate "Export ChromeOS EC internals in DebugFS"
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depends on MFD_CROS_EC_DEV && DEBUG_FS
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default MFD_CROS_EC_DEV
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help
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This option exposes the ChromeOS EC device internals to
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userspace.
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To compile this driver as a module, choose M here: the
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module will be called cros_ec_debugfs.
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config CROS_EC_SENSORHUB
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tristate "ChromeOS EC MEMS Sensor Hub"
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depends on MFD_CROS_EC_DEV
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default MFD_CROS_EC_DEV
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help
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Allow loading IIO sensors. This driver is loaded by MFD and will in
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turn query the EC and register the sensors.
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It also spreads the sensor data coming from the EC to the IIO sensor
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object.
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To compile this driver as a module, choose M here: the
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module will be called cros_ec_sensorhub.
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config CROS_EC_SYSFS
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tristate "ChromeOS EC control and information through sysfs"
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depends on MFD_CROS_EC_DEV && SYSFS
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default MFD_CROS_EC_DEV
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help
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This option exposes some sysfs attributes to control and get
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information from ChromeOS EC.
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To compile this driver as a module, choose M here: the
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module will be called cros_ec_sysfs.
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config CROS_EC_TYPEC
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tristate "ChromeOS EC Type-C Connector Control"
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depends on MFD_CROS_EC_DEV && TYPEC
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default MFD_CROS_EC_DEV
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help
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If you say Y here, you get support for accessing Type C connector
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information from the Chrome OS EC.
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To compile this driver as a module, choose M here: the module will be
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called cros_ec_typec.
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config CROS_USBPD_LOGGER
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tristate "Logging driver for USB PD charger"
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depends on CHARGER_CROS_USBPD
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default y
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select RTC_LIB
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help
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This option enables support for logging event data for the USB PD charger
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available in the Embedded Controller on ChromeOS systems.
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To compile this driver as a module, choose M here: the
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module will be called cros_usbpd_logger.
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config CROS_USBPD_NOTIFY
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tristate "ChromeOS Type-C power delivery event notifier"
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depends on MFD_CROS_EC_DEV
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default MFD_CROS_EC_DEV
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help
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If you say Y here, you get support for Type-C PD event notifications
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from the ChromeOS EC. On ACPI platorms this driver will bind to the
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GOOG0003 ACPI device, and on platforms which don't have this device it
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will get initialized on ECs which support the feature
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EC_FEATURE_USB_PD.
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To compile this driver as a module, choose M here: the
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module will be called cros_usbpd_notify.
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source "drivers/platform/chrome/wilco_ec/Kconfig"
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endif # CHROMEOS_PLATFORMS
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