Input: add EETI eGalax I2C capacitive multi touch driver (59bae1db) · Commits · e / devices / android_kernel_xiaomi_markw

drivers/input/touchscreen/Kconfig

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Original line number	Diff line number	Diff line
		@@ -177,6 +177,16 @@ config TOUCHSCREEN_EETI
		To compile this driver as a module, choose M here: the
		module will be called eeti_ts.

		config TOUCHSCREEN_EGALAX
		tristate "EETI eGalax multi-touch panel support"
		depends on I2C
		help
		Say Y here to enable support for I2C connected EETI
		eGalax multi-touch panels.

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

		config TOUCHSCREEN_FUJITSU
		tristate "Fujitsu serial touchscreen"
		select SERIO

drivers/input/touchscreen/Makefile

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		@@ -23,6 +23,7 @@ obj-$(CONFIG_TOUCHSCREEN_HAMPSHIRE) += hampshire.o
		obj-$(CONFIG_TOUCHSCREEN_GUNZE) += gunze.o
		obj-$(CONFIG_TOUCHSCREEN_EETI) += eeti_ts.o
		obj-$(CONFIG_TOUCHSCREEN_ELO) += elo.o
		obj-$(CONFIG_TOUCHSCREEN_EGALAX) += egalax_ts.o
		obj-$(CONFIG_TOUCHSCREEN_FUJITSU) += fujitsu_ts.o
		obj-$(CONFIG_TOUCHSCREEN_INEXIO) += inexio.o
		obj-$(CONFIG_TOUCHSCREEN_INTEL_MID) += intel-mid-touch.o

drivers/input/touchscreen/egalax_ts.c

0 → 100644

+303 −0

Original line number	Diff line number	Diff line
		/*
		* Driver for EETI eGalax Multiple Touch Controller
		*
		* Copyright (C) 2011 Freescale Semiconductor, Inc.
		*
		* based on max11801_ts.c
		*
		* 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.
		*/

		/* EETI eGalax serial touch screen controller is a I2C based multiple
		* touch screen controller, it supports 5 point multiple touch. */

		/* TODO:
		- auto idle mode support
		*/

		#include <linux/module.h>
		#include <linux/init.h>
		#include <linux/i2c.h>
		#include <linux/interrupt.h>
		#include <linux/input.h>
		#include <linux/irq.h>
		#include <linux/gpio.h>
		#include <linux/delay.h>
		#include <linux/slab.h>
		#include <linux/bitops.h>
		#include <linux/input/mt.h>

		/*
		* Mouse Mode: some panel may configure the controller to mouse mode,
		* which can only report one point at a given time.
		* This driver will ignore events in this mode.
		*/
		#define REPORT_MODE_MOUSE 0x1
		/*
		* Vendor Mode: this mode is used to transfer some vendor specific
		* messages.
		* This driver will ignore events in this mode.
		*/
		#define REPORT_MODE_VENDOR 0x3
		/* Multiple Touch Mode */
		#define REPORT_MODE_MTTOUCH 0x4

		#define MAX_SUPPORT_POINTS 5

		#define EVENT_VALID_OFFSET 7
		#define EVENT_VALID_MASK (0x1 << EVENT_VALID_OFFSET)
		#define EVENT_ID_OFFSET 2
		#define EVENT_ID_MASK (0xf << EVENT_ID_OFFSET)
		#define EVENT_IN_RANGE (0x1 << 1)
		#define EVENT_DOWN_UP (0X1 << 0)

		#define MAX_I2C_DATA_LEN 10

		#define EGALAX_MAX_X 32760
		#define EGALAX_MAX_Y 32760
		#define EGALAX_MAX_TRIES 100

		struct egalax_ts {
		struct i2c_client *client;
		struct input_dev *input_dev;
		};

		static irqreturn_t egalax_ts_interrupt(int irq, void *dev_id)
		{
		struct egalax_ts *ts = dev_id;
		struct input_dev *input_dev = ts->input_dev;
		struct i2c_client *client = ts->client;
		u8 buf[MAX_I2C_DATA_LEN];
		int id, ret, x, y, z;
		int tries = 0;
		bool down, valid;
		u8 state;

		do {
		ret = i2c_master_recv(client, buf, MAX_I2C_DATA_LEN);
		} while (ret == -EAGAIN && tries++ < EGALAX_MAX_TRIES);

		if (ret < 0)
		return IRQ_HANDLED;

		if (buf[0] != REPORT_MODE_MTTOUCH) {
		/* ignore mouse events and vendor events */
		return IRQ_HANDLED;
		}

		state = buf[1];
		x = (buf[3] << 8) \| buf[2];
		y = (buf[5] << 8) \| buf[4];
		z = (buf[7] << 8) \| buf[6];

		valid = state & EVENT_VALID_MASK;
		id = (state & EVENT_ID_MASK) >> EVENT_ID_OFFSET;
		down = state & EVENT_DOWN_UP;

		if (!valid \|\| id > MAX_SUPPORT_POINTS) {
		dev_dbg(&client->dev, "point invalid\n");
		return IRQ_HANDLED;
		}

		input_mt_slot(input_dev, id);
		input_mt_report_slot_state(input_dev, MT_TOOL_FINGER, down);

		dev_dbg(&client->dev, "%s id:%d x:%d y:%d z:%d",
		down ? "down" : "up", id, x, y, z);

		if (down) {
		input_report_abs(input_dev, ABS_MT_POSITION_X, x);
		input_report_abs(input_dev, ABS_MT_POSITION_Y, y);
		input_report_abs(input_dev, ABS_MT_PRESSURE, z);
		}

		input_mt_report_pointer_emulation(input_dev, true);
		input_sync(input_dev);

		return IRQ_HANDLED;
		}

		/* wake up controller by an falling edge of interrupt gpio. */
		static int egalax_wake_up_device(struct i2c_client *client)
		{
		int gpio = irq_to_gpio(client->irq);
		int ret;

		ret = gpio_request(gpio, "egalax_irq");
		if (ret < 0) {
		dev_err(&client->dev,
		"request gpio failed, cannot wake up controller: %d\n",
		ret);
		return ret;
		}

		/* wake up controller via an falling edge on IRQ gpio. */
		gpio_direction_output(gpio, 0);
		gpio_set_value(gpio, 1);

		/* controller should be waken up, return irq. */
		gpio_direction_input(gpio);
		gpio_free(gpio);

		return 0;
		}

		static int __devinit egalax_firmware_version(struct i2c_client *client)
		{
		static const u8 cmd[MAX_I2C_DATA_LEN] = { 0x03, 0x03, 0xa, 0x01, 0x41 };
		int ret;

		ret = i2c_master_send(client, cmd, MAX_I2C_DATA_LEN);
		if (ret < 0)
		return ret;

		return 0;
		}

		static int __devinit egalax_ts_probe(struct i2c_client *client,
		const struct i2c_device_id *id)
		{
		struct egalax_ts *ts;
		struct input_dev *input_dev;
		int ret;
		int error;

		ts = kzalloc(sizeof(struct egalax_ts), GFP_KERNEL);
		if (!ts) {
		dev_err(&client->dev, "Failed to allocate memory\n");
		return -ENOMEM;
		}

		input_dev = input_allocate_device();
		if (!input_dev) {
		dev_err(&client->dev, "Failed to allocate memory\n");
		error = -ENOMEM;
		goto err_free_ts;
		}

		ts->client = client;
		ts->input_dev = input_dev;

		/* controller may be in sleep, wake it up. */
		egalax_wake_up_device(client);

		ret = egalax_firmware_version(client);
		if (ret < 0) {
		dev_err(&client->dev, "Failed to read firmware version\n");
		error = -EIO;
		goto err_free_dev;
		}

		input_dev->name = "EETI eGalax Touch Screen";
		input_dev->id.bustype = BUS_I2C;
		input_dev->dev.parent = &client->dev;

		__set_bit(EV_ABS, input_dev->evbit);
		__set_bit(EV_KEY, input_dev->evbit);
		__set_bit(BTN_TOUCH, input_dev->keybit);

		input_set_abs_params(input_dev, ABS_X, 0, EGALAX_MAX_X, 0, 0);
		input_set_abs_params(input_dev, ABS_Y, 0, EGALAX_MAX_Y, 0, 0);
		input_set_abs_params(input_dev,
		ABS_MT_POSITION_X, 0, EGALAX_MAX_X, 0, 0);
		input_set_abs_params(input_dev,
		ABS_MT_POSITION_X, 0, EGALAX_MAX_Y, 0, 0);
		input_mt_init_slots(input_dev, MAX_SUPPORT_POINTS);

		input_set_drvdata(input_dev, ts);

		error = request_threaded_irq(client->irq, NULL, egalax_ts_interrupt,
		IRQF_TRIGGER_LOW \| IRQF_ONESHOT,
		"egalax_ts", ts);
		if (error < 0) {
		dev_err(&client->dev, "Failed to register interrupt\n");
		goto err_free_dev;
		}

		error = input_register_device(ts->input_dev);
		if (error)
		goto err_free_irq;

		i2c_set_clientdata(client, ts);
		return 0;

		err_free_irq:
		free_irq(client->irq, ts);
		err_free_dev:
		input_free_device(input_dev);
		err_free_ts:
		kfree(ts);

		return error;
		}

		static __devexit int egalax_ts_remove(struct i2c_client *client)
		{
		struct egalax_ts *ts = i2c_get_clientdata(client);

		free_irq(client->irq, ts);

		input_unregister_device(ts->input_dev);
		kfree(ts);

		return 0;
		}

		static const struct i2c_device_id egalax_ts_id[] = {
		{ "egalax_ts", 0 },
		{ }
		};
		MODULE_DEVICE_TABLE(i2c, egalax_ts_id);

		#ifdef CONFIG_PM_SLEEP
		static int egalax_ts_suspend(struct device *dev)
		{
		static const u8 suspend_cmd[MAX_I2C_DATA_LEN] = {
		0x3, 0x6, 0xa, 0x3, 0x36, 0x3f, 0x2, 0, 0, 0
		};
		struct i2c_client *client = to_i2c_client(dev);
		int ret;

		ret = i2c_master_send(client, suspend_cmd, MAX_I2C_DATA_LEN);
		return ret > 0 ? 0 : ret;
		}

		static int egalax_ts_resume(struct device *dev)
		{
		struct i2c_client *client = to_i2c_client(dev);

		return egalax_wake_up_device(client);
		}
		#endif

		static SIMPLE_DEV_PM_OPS(egalax_ts_pm_ops, egalax_ts_suspend, egalax_ts_resume);

		static struct i2c_driver egalax_ts_driver = {
		.driver = {
		.name = "egalax_ts",
		.owner = THIS_MODULE,
		.pm = &egalax_ts_pm_ops,
		},
		.id_table = egalax_ts_id,
		.probe = egalax_ts_probe,
		.remove = __devexit_p(egalax_ts_remove),
		};

		static int __init egalax_ts_init(void)
		{
		return i2c_add_driver(&egalax_ts_driver);
		}

		static void __exit egalax_ts_exit(void)
		{
		i2c_del_driver(&egalax_ts_driver);
		}

		module_init(egalax_ts_init);
		module_exit(egalax_ts_exit);

		MODULE_AUTHOR("Freescale Semiconductor, Inc.");
		MODULE_DESCRIPTION("Touchscreen driver for EETI eGalax touch controller");
		MODULE_LICENSE("GPL");