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/*
* mcs5000_ts.c - Touchscreen driver for MELFAS MCS-5000 controller
*
* Copyright (C) 2009 Samsung Electronics Co.Ltd
* Author: Joonyoung Shim <jy0922.shim@samsung.com>
*
* Based on wm97xx-core.c
*
* 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.
*
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/i2c/mcs.h>
#include <linux/interrupt.h>
#include <linux/input.h>
#include <linux/irq.h>
#include <linux/slab.h>
/* Registers */
#define MCS5000_TS_STATUS 0x00
#define STATUS_OFFSET 0
#define STATUS_NO (0 << STATUS_OFFSET)
#define STATUS_INIT (1 << STATUS_OFFSET)
#define STATUS_SENSING (2 << STATUS_OFFSET)
#define STATUS_COORD (3 << STATUS_OFFSET)
#define STATUS_GESTURE (4 << STATUS_OFFSET)
#define ERROR_OFFSET 4
#define ERROR_NO (0 << ERROR_OFFSET)
#define ERROR_POWER_ON_RESET (1 << ERROR_OFFSET)
#define ERROR_INT_RESET (2 << ERROR_OFFSET)
#define ERROR_EXT_RESET (3 << ERROR_OFFSET)
#define ERROR_INVALID_REG_ADDRESS (8 << ERROR_OFFSET)
#define ERROR_INVALID_REG_VALUE (9 << ERROR_OFFSET)
#define MCS5000_TS_OP_MODE 0x01
#define RESET_OFFSET 0
#define RESET_NO (0 << RESET_OFFSET)
#define RESET_EXT_SOFT (1 << RESET_OFFSET)
#define OP_MODE_OFFSET 1
#define OP_MODE_SLEEP (0 << OP_MODE_OFFSET)
#define OP_MODE_ACTIVE (1 << OP_MODE_OFFSET)
#define GESTURE_OFFSET 4
#define GESTURE_DISABLE (0 << GESTURE_OFFSET)
#define GESTURE_ENABLE (1 << GESTURE_OFFSET)
#define PROXIMITY_OFFSET 5
#define PROXIMITY_DISABLE (0 << PROXIMITY_OFFSET)
#define PROXIMITY_ENABLE (1 << PROXIMITY_OFFSET)
#define SCAN_MODE_OFFSET 6
#define SCAN_MODE_INTERRUPT (0 << SCAN_MODE_OFFSET)
#define SCAN_MODE_POLLING (1 << SCAN_MODE_OFFSET)
#define REPORT_RATE_OFFSET 7
#define REPORT_RATE_40 (0 << REPORT_RATE_OFFSET)
#define REPORT_RATE_80 (1 << REPORT_RATE_OFFSET)
#define MCS5000_TS_SENS_CTL 0x02
#define MCS5000_TS_FILTER_CTL 0x03
#define PRI_FILTER_OFFSET 0
#define SEC_FILTER_OFFSET 4
#define MCS5000_TS_X_SIZE_UPPER 0x08
#define MCS5000_TS_X_SIZE_LOWER 0x09
#define MCS5000_TS_Y_SIZE_UPPER 0x0A
#define MCS5000_TS_Y_SIZE_LOWER 0x0B
#define MCS5000_TS_INPUT_INFO 0x10
#define INPUT_TYPE_OFFSET 0
#define INPUT_TYPE_NONTOUCH (0 << INPUT_TYPE_OFFSET)
#define INPUT_TYPE_SINGLE (1 << INPUT_TYPE_OFFSET)
#define INPUT_TYPE_DUAL (2 << INPUT_TYPE_OFFSET)
#define INPUT_TYPE_PALM (3 << INPUT_TYPE_OFFSET)
#define INPUT_TYPE_PROXIMITY (7 << INPUT_TYPE_OFFSET)
#define GESTURE_CODE_OFFSET 3
#define GESTURE_CODE_NO (0 << GESTURE_CODE_OFFSET)
#define MCS5000_TS_X_POS_UPPER 0x11
#define MCS5000_TS_X_POS_LOWER 0x12
#define MCS5000_TS_Y_POS_UPPER 0x13
#define MCS5000_TS_Y_POS_LOWER 0x14
#define MCS5000_TS_Z_POS 0x15
#define MCS5000_TS_WIDTH 0x16
#define MCS5000_TS_GESTURE_VAL 0x17
#define MCS5000_TS_MODULE_REV 0x20
#define MCS5000_TS_FIRMWARE_VER 0x21
/* Touchscreen absolute values */
#define MCS5000_MAX_XC 0x3ff
#define MCS5000_MAX_YC 0x3ff
enum mcs5000_ts_read_offset {
READ_INPUT_INFO,
READ_X_POS_UPPER,
READ_X_POS_LOWER,
READ_Y_POS_UPPER,
READ_Y_POS_LOWER,
READ_BLOCK_SIZE,
};
/* Each client has this additional data */
struct mcs5000_ts_data {
struct i2c_client *client;
struct input_dev *input_dev;
const struct mcs_platform_data *platform_data;
};
static irqreturn_t mcs5000_ts_interrupt(int irq, void *dev_id)
{
struct mcs5000_ts_data *data = dev_id;
struct i2c_client *client = data->client;
u8 buffer[READ_BLOCK_SIZE];
int err;
int x;
int y;
err = i2c_smbus_read_i2c_block_data(client, MCS5000_TS_INPUT_INFO,
READ_BLOCK_SIZE, buffer);
if (err < 0) {
dev_err(&client->dev, "%s, err[%d]\n", __func__, err);
goto out;
}
switch (buffer[READ_INPUT_INFO]) {
case INPUT_TYPE_NONTOUCH:
input_report_key(data->input_dev, BTN_TOUCH, 0);
input_sync(data->input_dev);
break;
case INPUT_TYPE_SINGLE:
x = (buffer[READ_X_POS_UPPER] << 8) | buffer[READ_X_POS_LOWER];
y = (buffer[READ_Y_POS_UPPER] << 8) | buffer[READ_Y_POS_LOWER];
input_report_key(data->input_dev, BTN_TOUCH, 1);
input_report_abs(data->input_dev, ABS_X, x);
input_report_abs(data->input_dev, ABS_Y, y);
input_sync(data->input_dev);
break;
case INPUT_TYPE_DUAL:
/* TODO */
break;
case INPUT_TYPE_PALM:
/* TODO */
break;
case INPUT_TYPE_PROXIMITY:
/* TODO */
break;
default:
dev_err(&client->dev, "Unknown ts input type %d\n",
buffer[READ_INPUT_INFO]);
break;
}
out:
return IRQ_HANDLED;
}
static void mcs5000_ts_phys_init(struct mcs5000_ts_data *data)
{
const struct mcs_platform_data *platform_data =
data->platform_data;
struct i2c_client *client = data->client;
/* Touch reset & sleep mode */
i2c_smbus_write_byte_data(client, MCS5000_TS_OP_MODE,
RESET_EXT_SOFT | OP_MODE_SLEEP);
/* Touch size */
i2c_smbus_write_byte_data(client, MCS5000_TS_X_SIZE_UPPER,
platform_data->x_size >> 8);
i2c_smbus_write_byte_data(client, MCS5000_TS_X_SIZE_LOWER,
platform_data->x_size & 0xff);
i2c_smbus_write_byte_data(client, MCS5000_TS_Y_SIZE_UPPER,
platform_data->y_size >> 8);
i2c_smbus_write_byte_data(client, MCS5000_TS_Y_SIZE_LOWER,
platform_data->y_size & 0xff);
/* Touch active mode & 80 report rate */
i2c_smbus_write_byte_data(data->client, MCS5000_TS_OP_MODE,
OP_MODE_ACTIVE | REPORT_RATE_80);
}
static int mcs5000_ts_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct mcs5000_ts_data *data;
struct input_dev *input_dev;
int ret;
if (!dev_get_platdata(&client->dev))
return -EINVAL;
data = kzalloc(sizeof(struct mcs5000_ts_data), GFP_KERNEL);
input_dev = input_allocate_device();
if (!data || !input_dev) {
dev_err(&client->dev, "Failed to allocate memory\n");
ret = -ENOMEM;
goto err_free_mem;
}
data->client = client;
data->input_dev = input_dev;
data->platform_data = dev_get_platdata(&client->dev);
input_dev->name = "MELPAS MCS-5000 Touchscreen";
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, MCS5000_MAX_XC, 0, 0);
input_set_abs_params(input_dev, ABS_Y, 0, MCS5000_MAX_YC, 0, 0);
input_set_drvdata(input_dev, data);
if (data->platform_data->cfg_pin)
data->platform_data->cfg_pin();
ret = request_threaded_irq(client->irq, NULL, mcs5000_ts_interrupt,
IRQF_TRIGGER_LOW | IRQF_ONESHOT, "mcs5000_ts", data);
if (ret < 0) {
dev_err(&client->dev, "Failed to register interrupt\n");
goto err_free_mem;
}
ret = input_register_device(data->input_dev);
if (ret < 0)
goto err_free_irq;
mcs5000_ts_phys_init(data);
i2c_set_clientdata(client, data);
return 0;
err_free_irq:
free_irq(client->irq, data);
err_free_mem:
input_free_device(input_dev);
kfree(data);
return ret;
}
static int mcs5000_ts_remove(struct i2c_client *client)
{
struct mcs5000_ts_data *data = i2c_get_clientdata(client);
free_irq(client->irq, data);
input_unregister_device(data->input_dev);
kfree(data);
return 0;
}
#ifdef CONFIG_PM
static int mcs5000_ts_suspend(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
/* Touch sleep mode */
i2c_smbus_write_byte_data(client, MCS5000_TS_OP_MODE, OP_MODE_SLEEP);
return 0;
}
static int mcs5000_ts_resume(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct mcs5000_ts_data *data = i2c_get_clientdata(client);
mcs5000_ts_phys_init(data);
return 0;
}
static SIMPLE_DEV_PM_OPS(mcs5000_ts_pm, mcs5000_ts_suspend, mcs5000_ts_resume);
#endif
static const struct i2c_device_id mcs5000_ts_id[] = {
{ "mcs5000_ts", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, mcs5000_ts_id);
static struct i2c_driver mcs5000_ts_driver = {
.probe = mcs5000_ts_probe,
.remove = mcs5000_ts_remove,
.driver = {
.name = "mcs5000_ts",
#ifdef CONFIG_PM
.pm = &mcs5000_ts_pm,
#endif
},
.id_table = mcs5000_ts_id,
};
module_i2c_driver(mcs5000_ts_driver);
/* Module information */
MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
MODULE_DESCRIPTION("Touchscreen driver for MELFAS MCS-5000 controller");
MODULE_LICENSE("GPL");
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