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linux/drivers/input/touchscreen/mcs5000_ts.c
Wolfram Sang fbae3fb154 i2c: Remove all i2c_set_clientdata(client, NULL) in drivers 
I2C drivers can use the clientdata-pointer to point to private data. As I2C
devices are not really unregistered, but merely detached from their driver, it
used to be the drivers obligation to clear this pointer during remove() or a
failed probe(). As a couple of drivers forgot to do this, it was agreed that it
was cleaner if the i2c-core does this clearance when appropriate, as there is
no guarantee for the lifetime of the clientdata-pointer after remove() anyhow.
This feature was added to the core with commit
e4a7b9b04d to fix the faulty drivers.

As there is no need anymore to clear the clientdata-pointer, remove all current
occurrences in the drivers to simplify the code and prevent confusion.

Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Acked-by: Richard Purdie <rpurdie@linux.intel.com>
Acked-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
2010-06-03 11:33:58 +02:00

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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/mcs5000_ts.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 mcs5000_ts_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 mcs5000_ts_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 __devinit 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 (!client->dev.platform_data)
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 = client->dev.platform_data;
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 __devexit 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 i2c_client *client, pm_message_t mesg)
{
/* Touch sleep mode */
i2c_smbus_write_byte_data(client, MCS5000_TS_OP_MODE, OP_MODE_SLEEP);
return 0;
}
static int mcs5000_ts_resume(struct i2c_client *client)
{
struct mcs5000_ts_data *data = i2c_get_clientdata(client);
mcs5000_ts_phys_init(data);
return 0;
}
#else
#define mcs5000_ts_suspend NULL
#define mcs5000_ts_resume NULL
#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 = __devexit_p(mcs5000_ts_remove),
.suspend = mcs5000_ts_suspend,
.resume = mcs5000_ts_resume,
.driver = {
.name = "mcs5000_ts",
},
.id_table = mcs5000_ts_id,
};
static int __init mcs5000_ts_init(void)
{
return i2c_add_driver(&mcs5000_ts_driver);
}
static void __exit mcs5000_ts_exit(void)
{
i2c_del_driver(&mcs5000_ts_driver);
}
module_init(mcs5000_ts_init);
module_exit(mcs5000_ts_exit);
/* 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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