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Commit 6696777c authored by Duson Lin's avatar Duson Lin Committed by Dmitry Torokhov
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Input: add driver for Elan I2C/SMbus touchpad 



This driver supports Elan I2C/SMbus touchpads found in some laptops and
also in many Chromebooks.

Signed-off-by: default avatarDuson Lin <dusonlin@emc.com.tw>
Reviewed-by: default avatarBenson Leung <bleung@chromium.org>
Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
parent dae7aa8d

Documentation/devicetree/bindings/input/elan_i2c.txt

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Elantech I2C Touchpad



Required properties:

- compatible: must be "elan,ekth3000".

- 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:

	&i2c1 {

		/* ... */



		touchpad@15 {

			compatible = "elan,ekth3000";

			reg = <0x15>;

			interrupt-parent = <&gpio4>;

			interrupts = <0x0 IRQ_TYPE_EDGE_FALLING>;

			wakeup-source;

		};



		/* ... */

	};

Documentation/devicetree/bindings/vendor-prefixes.txt

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@@ -42,6 +42,7 @@ dlink D-Link Corporation 
dmo	Data Modul AG

ebv	EBV Elektronik

edt	Emerging Display Technologies

elan	Elan Microelectronic Corp.

emmicro	EM Microelectronic

epcos	EPCOS AG

epfl	Ecole Polytechnique Fédérale de Lausanne

drivers/input/mouse/Kconfig

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@@ -215,6 +215,36 @@ config MOUSE_CYAPA 
	  To compile this driver as a module, choose M here: the module will be

	  called cyapa.



config MOUSE_ELAN_I2C

	tristate "ELAN I2C Touchpad support"

	depends on I2C

	help

	  This driver adds support for Elan I2C/SMbus Trackpads.



	  Say Y here if you have a ELAN I2C/SMbus Touchpad.



	  To compile this driver as a module, choose M here: the module will be

	  called elan_i2c.



config MOUSE_ELAN_I2C_I2C

	bool "Enable I2C support"

	depends on MOUSE_ELAN_I2C

	default y

	help

	   Say Y here if Elan Touchpad in your system is connected to

	   a standard I2C controller.



	   If unsure, say Y.



config MOUSE_ELAN_I2C_SMBUS

	bool "Enable SMbus support"

	depends on MOUSE_ELAN_I2C

	help

	   Say Y here if Elan Touchpad in your system is connected to

	   a SMbus adapter.



	   If unsure, say Y.



config MOUSE_INPORT

	tristate "InPort/MS/ATIXL busmouse"

	depends on ISA

drivers/input/mouse/Makefile

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@@ -9,6 +9,7 @@ obj-$(CONFIG_MOUSE_APPLETOUCH) += appletouch.o 
obj-$(CONFIG_MOUSE_ATARI)		+= atarimouse.o

obj-$(CONFIG_MOUSE_BCM5974)		+= bcm5974.o

obj-$(CONFIG_MOUSE_CYAPA)		+= cyapa.o

obj-$(CONFIG_MOUSE_ELAN_I2C)		+= elan_i2c.o

obj-$(CONFIG_MOUSE_GPIO)		+= gpio_mouse.o

obj-$(CONFIG_MOUSE_INPORT)		+= inport.o

obj-$(CONFIG_MOUSE_LOGIBM)		+= logibm.o
@@ -34,3 +35,7 @@ psmouse-$(CONFIG_MOUSE_PS2_SENTELIC) += sentelic.o 
psmouse-$(CONFIG_MOUSE_PS2_TRACKPOINT)	+= trackpoint.o

psmouse-$(CONFIG_MOUSE_PS2_TOUCHKIT)	+= touchkit_ps2.o

psmouse-$(CONFIG_MOUSE_PS2_CYPRESS)	+= cypress_ps2.o



elan_i2c-objs := elan_i2c_core.o

elan_i2c-$(CONFIG_MOUSE_ELAN_I2C_I2C)	+= elan_i2c_i2c.o

elan_i2c-$(CONFIG_MOUSE_ELAN_I2C_SMBUS)	+= elan_i2c_smbus.o

drivers/input/mouse/elan_i2c.h

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/*

 * Elan I2C/SMBus Touchpad driver

 *

 * Copyright (c) 2013 ELAN Microelectronics Corp.

 *

 * Author: 林政維 (Duson Lin) <dusonlin@emc.com.tw>

 * Version: 1.5.5

 *

 * Based on cyapa driver:

 * copyright (c) 2011-2012 Cypress Semiconductor, Inc.

 * copyright (c) 2011-2012 Google, Inc.

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 as published

 * by the Free Software Foundation.

 *

 * Trademarks are the property of their respective owners.

 */



#ifndef _ELAN_I2C_H

#define _ELAN_i2C_H



#include <linux/types.h>



#define ETP_ENABLE_ABS		0x0001

#define ETP_ENABLE_CALIBRATE	0x0002

#define ETP_DISABLE_CALIBRATE	0x0000

#define ETP_DISABLE_POWER	0x0001



/* IAP Firmware handling */

#define ETP_FW_NAME		"elan_i2c.bin"

#define ETP_IAP_START_ADDR	0x0083

#define ETP_FW_IAP_PAGE_ERR	(1 << 5)

#define ETP_FW_IAP_INTF_ERR	(1 << 4)

#define ETP_FW_PAGE_SIZE	64

#define ETP_FW_PAGE_COUNT	768

#define ETP_FW_SIZE		(ETP_FW_PAGE_SIZE * ETP_FW_PAGE_COUNT)



struct i2c_client;

struct completion;



enum tp_mode {

	IAP_MODE = 1,

	MAIN_MODE

};



struct elan_transport_ops {

	int (*initialize)(struct i2c_client *client);

	int (*sleep_control)(struct i2c_client *, bool sleep);

	int (*power_control)(struct i2c_client *, bool enable);

	int (*set_mode)(struct i2c_client *client, u8 mode);



	int (*calibrate)(struct i2c_client *client);

	int (*calibrate_result)(struct i2c_client *client, u8 *val);



	int (*get_baseline_data)(struct i2c_client *client,

				 bool max_baseliune, u8 *value);



	int (*get_version)(struct i2c_client *client, bool iap, u8 *version);

	int (*get_sm_version)(struct i2c_client *client, u8 *version);

	int (*get_checksum)(struct i2c_client *client, bool iap, u16 *csum);

	int (*get_product_id)(struct i2c_client *client, u8 *id);



	int (*get_max)(struct i2c_client *client,

		       unsigned int *max_x, unsigned int *max_y);

	int (*get_resolution)(struct i2c_client *client,

			      u8 *hw_res_x, u8 *hw_res_y);

	int (*get_num_traces)(struct i2c_client *client,

			      unsigned int *x_tracenum,

			      unsigned int *y_tracenum);



	int (*iap_get_mode)(struct i2c_client *client, enum tp_mode *mode);

	int (*iap_reset)(struct i2c_client *client);



	int (*prepare_fw_update)(struct i2c_client *client);

	int (*write_fw_block)(struct i2c_client *client,

			      const u8 *page, u16 checksum, int idx);

	int (*finish_fw_update)(struct i2c_client *client,

				struct completion *reset_done);



	int (*get_report)(struct i2c_client *client, u8 *report);

};



extern const struct elan_transport_ops elan_smbus_ops, elan_i2c_ops;



#endif /* _ELAN_I2C_H */