[SOLVE] kernel option for Acer C720 Chromebook

Message

minsoehan · Post by **minsoehan** » Fri Mar 31, 2017 1:55 pm

I install Gentoo on Acer C720 Chromebook.
Everything fines but touchpad.
It doesn't work with synaptics or libinput.
As I know kernel option for this Chromebook's touchpad is CONFIG_MOUSE_CYAPA: Cypress APA I2C Trackpad support.

I enable in kernel configuration but still not work.

Is there anyone using gentoo Acer C720 Chromebook?

Post by **NeddySeagoon** » Fri Mar 31, 2017 2:05 pm

minsoehan,

You also need the correct I2C support in the kernel.

minsoehan · Post by **minsoehan** » Fri Mar 31, 2017 2:57 pm

correct I2C support

I have I2C support enabled I think. But it is correct or not.
Here is mine:

Code: Select all

CONFIG_REGMAP_I2C=y
# CONFIG_SENSORS_LIS3_I2C is not set
CONFIG_MOUSE_ELAN_I2C=m
CONFIG_MOUSE_ELAN_I2C_I2C=y
CONFIG_MOUSE_ELAN_I2C_SMBUS=y
CONFIG_MOUSE_SYNAPTICS_I2C=m
# I2C support
CONFIG_I2C=y
CONFIG_ACPI_I2C_OPREGION=y
CONFIG_I2C_BOARDINFO=y
CONFIG_I2C_COMPAT=y
CONFIG_I2C_CHARDEV=y
CONFIG_I2C_MUX=m
# Multiplexer I2C Chip support
CONFIG_I2C_MUX_PCA9541=m
CONFIG_I2C_MUX_PINCTRL=m
CONFIG_I2C_MUX_REG=m
CONFIG_I2C_HELPER_AUTO=y
CONFIG_I2C_SMBUS=y
CONFIG_I2C_ALGOBIT=y
# I2C Hardware Bus support
# CONFIG_I2C_ALI1535 is not set
# CONFIG_I2C_ALI1563 is not set
# CONFIG_I2C_ALI15X3 is not set
# CONFIG_I2C_AMD756 is not set
# CONFIG_I2C_AMD8111 is not set
CONFIG_I2C_I801=y
# CONFIG_I2C_ISCH is not set
# CONFIG_I2C_ISMT is not set
# CONFIG_I2C_PIIX4 is not set
# CONFIG_I2C_NFORCE2 is not set
# CONFIG_I2C_SIS5595 is not set
# CONFIG_I2C_SIS630 is not set
# CONFIG_I2C_SIS96X is not set
# CONFIG_I2C_VIA is not set
# CONFIG_I2C_VIAPRO is not set
CONFIG_I2C_SCMI=y
# I2C system bus drivers (mostly embedded / system-on-chip)
# CONFIG_I2C_DESIGNWARE_PLATFORM is not set
# CONFIG_I2C_DESIGNWARE_PCI is not set
# CONFIG_I2C_EMEV2 is not set
# CONFIG_I2C_OCORES is not set
# CONFIG_I2C_PCA_PLATFORM is not set
# CONFIG_I2C_PXA_PCI is not set
# CONFIG_I2C_SIMTEC is not set
# CONFIG_I2C_XILINX is not set
# External I2C/SMBus adapter drivers
# CONFIG_I2C_DIOLAN_U2C is not set
# CONFIG_I2C_PARPORT_LIGHT is not set
# CONFIG_I2C_ROBOTFUZZ_OSIF is not set
# CONFIG_I2C_TAOS_EVM is not set
# CONFIG_I2C_TINY_USB is not set
# Other I2C/SMBus bus drivers
CONFIG_I2C_STUB=m
# CONFIG_I2C_SLAVE is not set
# CONFIG_I2C_DEBUG_CORE is not set
# CONFIG_I2C_DEBUG_ALGO is not set
# CONFIG_I2C_DEBUG_BUS is not set
# CONFIG_MFD_AXP20X_I2C is not set
# CONFIG_MFD_DA9052_I2C is not set
# CONFIG_MFD_MC13XXX_I2C is not set
# CONFIG_MFD_INTEL_QUARK_I2C_GPIO is not set
# CONFIG_MFD_TPS65912_I2C is not set
# CONFIG_MFD_ARIZONA_I2C is not set
# CONFIG_MFD_WM831X_I2C is not set
# CONFIG_MFD_WM8350_I2C is not set
# I2C encoder or helper chips
# CONFIG_DRM_I2C_CH7006 is not set
# CONFIG_DRM_I2C_SIL164 is not set
# CONFIG_DRM_I2C_NXP_TDA998X is not set
# I2C HID support
CONFIG_I2C_HID=m
# I2C RTC drivers
CONFIG_RTC_I2C_AND_SPI=y
# SPI and I2C RTC drivers

And I also have CONFIG_CHROME_PLATFORMS=y

Post by **NeddySeagoon** » Fri Mar 31, 2017 3:15 pm

minsoehan,

The Arch Wiki is often useful
That link is to configure the touchpad for Xorg. There are links there to the kernel too.

minsoehan · Post by **minsoehan** » Fri Mar 31, 2017 3:16 pm

I think this LINK has something to do with my problem.
because here is mine:

Code: Select all

~ $ dmesg | grep 0x24
[    0.108170] ACPI: \_SB_.PCI0.LPCB.EC0_: GPE=0x24, EC_CMD/EC_SC=0x66, EC_DATA=0x62
[    0.122320] pci 0000:00:1f.2: reg 0x24: [mem 0xe051f000-0xe051f7ff]
[    0.132512] ACPI: \_SB_.PCI0.LPCB.EC0_: GPE=0x24, EC_CMD/EC_SC=0x66, EC_DATA=0x62

minsoehan · Post by **minsoehan** » Fri Mar 31, 2017 3:24 pm

I went to see there /usr/src/linux/Documentation/devicetree/bindings/input/cypress,cyapa.txt
I found this...

Code: Select all

Cypress I2C Touchpad

Required properties:
- compatible: must be "cypress,cyapa".
- reg: I2C address of the chip.
- interrupt-parent: a phandle for the interrupt controller (see interrupt
	binding[0]).
- interrupts: interrupt to which the chip is connected (see interrupt
	binding[0]).

Optional properties:
- wakeup-source: touchpad can be used as a wakeup source.
- pinctrl-names: should be "default" (see pinctrl binding [1]).
- pinctrl-0: a phandle pointing to the pin settings for the device (see
	pinctrl binding [1]).
- vcc-supply: a phandle for the regulator supplying 3.3V power.

[0]: Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
[1]: Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt

Example:
	&i2c0 {
		/* ... */

		/* Cypress Gen3 touchpad */
		touchpad@67 {
			compatible = "cypress,cyapa";
			reg = <0x67>;
			interrupt-parent = <&gpio>;
			interrupts = <2 IRQ_TYPE_EDGE_FALLING>;	/* GPIO 2 */
			wakeup-source;
		};

		/* Cypress Gen5 and later touchpad */
		touchpad@24 {
			compatible = "cypress,cyapa";
			reg = <0x24>;
			interrupt-parent = <&gpio>;
			interrupts = <2 IRQ_TYPE_EDGE_FALLING>;	/* GPIO 2 */
			wakeup-source;
		};

		/* ... */
	};

minsoehan · Post by **minsoehan** » Fri Mar 31, 2017 3:41 pm

NeddySeagoon wrote:minsoehan,

The Arch Wiki is often useful
That link is to configure the touchpad for Xorg. There are links there to the kernel too.

I have tried with configurations mentioned in Arch Wiki.
But not work.

And I am using KDE Plasma with synaptics for input devices. If touchpad is properly detected by kernel, those text configurations are not even needed, right?
Just go to setting > input device.

minsoehan · Post by **minsoehan** » Fri Mar 31, 2017 11:07 pm

Yes right, it is requiring correct i2c support

To be correct i2c support, I need these thing in kernel

Code: Select all

CONFIG_I2C_DESIGNWARE_CORE=y
CONFIG_I2C_DESIGNWARE_PLATFORM=y
CONFIG_I2C_DESIGNWARE_PCI=y

Now my touchpad works perfect.

Thank you man.