285 lines
7.0 KiB
C
285 lines
7.0 KiB
C
/*
|
|
* Touchkey driver for MELFAS MCS5000/5080 controller
|
|
*
|
|
* Copyright (C) 2010 Samsung Electronics Co.Ltd
|
|
* Author: HeungJun Kim <riverful.kim@samsung.com>
|
|
* Author: Joonyoung Shim <jy0922.shim@samsung.com>
|
|
*
|
|
* 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>
|
|
#include <linux/pm.h>
|
|
|
|
/* MCS5000 Touchkey */
|
|
#define MCS5000_TOUCHKEY_STATUS 0x04
|
|
#define MCS5000_TOUCHKEY_STATUS_PRESS 7
|
|
#define MCS5000_TOUCHKEY_FW 0x0a
|
|
#define MCS5000_TOUCHKEY_BASE_VAL 0x61
|
|
|
|
/* MCS5080 Touchkey */
|
|
#define MCS5080_TOUCHKEY_STATUS 0x00
|
|
#define MCS5080_TOUCHKEY_STATUS_PRESS 3
|
|
#define MCS5080_TOUCHKEY_FW 0x01
|
|
#define MCS5080_TOUCHKEY_BASE_VAL 0x1
|
|
|
|
enum mcs_touchkey_type {
|
|
MCS5000_TOUCHKEY,
|
|
MCS5080_TOUCHKEY,
|
|
};
|
|
|
|
struct mcs_touchkey_chip {
|
|
unsigned int status_reg;
|
|
unsigned int pressbit;
|
|
unsigned int press_invert;
|
|
unsigned int baseval;
|
|
};
|
|
|
|
struct mcs_touchkey_data {
|
|
void (*poweron)(bool);
|
|
|
|
struct i2c_client *client;
|
|
struct input_dev *input_dev;
|
|
struct mcs_touchkey_chip chip;
|
|
unsigned int key_code;
|
|
unsigned int key_val;
|
|
unsigned short keycodes[];
|
|
};
|
|
|
|
static irqreturn_t mcs_touchkey_interrupt(int irq, void *dev_id)
|
|
{
|
|
struct mcs_touchkey_data *data = dev_id;
|
|
struct mcs_touchkey_chip *chip = &data->chip;
|
|
struct i2c_client *client = data->client;
|
|
struct input_dev *input = data->input_dev;
|
|
unsigned int key_val;
|
|
unsigned int pressed;
|
|
int val;
|
|
|
|
val = i2c_smbus_read_byte_data(client, chip->status_reg);
|
|
if (val < 0) {
|
|
dev_err(&client->dev, "i2c read error [%d]\n", val);
|
|
goto out;
|
|
}
|
|
|
|
pressed = (val & (1 << chip->pressbit)) >> chip->pressbit;
|
|
if (chip->press_invert)
|
|
pressed ^= chip->press_invert;
|
|
|
|
/* key_val is 0 when released, so we should use key_val of press. */
|
|
if (pressed) {
|
|
key_val = val & (0xff >> (8 - chip->pressbit));
|
|
if (!key_val)
|
|
goto out;
|
|
key_val -= chip->baseval;
|
|
data->key_code = data->keycodes[key_val];
|
|
data->key_val = key_val;
|
|
}
|
|
|
|
input_event(input, EV_MSC, MSC_SCAN, data->key_val);
|
|
input_report_key(input, data->key_code, pressed);
|
|
input_sync(input);
|
|
|
|
dev_dbg(&client->dev, "key %d %d %s\n", data->key_val, data->key_code,
|
|
pressed ? "pressed" : "released");
|
|
|
|
out:
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int mcs_touchkey_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
const struct mcs_platform_data *pdata;
|
|
struct mcs_touchkey_data *data;
|
|
struct input_dev *input_dev;
|
|
unsigned int fw_reg;
|
|
int fw_ver;
|
|
int error;
|
|
int i;
|
|
|
|
pdata = client->dev.platform_data;
|
|
if (!pdata) {
|
|
dev_err(&client->dev, "no platform data defined\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
data = kzalloc(sizeof(struct mcs_touchkey_data) +
|
|
sizeof(data->keycodes[0]) * (pdata->key_maxval + 1),
|
|
GFP_KERNEL);
|
|
input_dev = input_allocate_device();
|
|
if (!data || !input_dev) {
|
|
dev_err(&client->dev, "Failed to allocate memory\n");
|
|
error = -ENOMEM;
|
|
goto err_free_mem;
|
|
}
|
|
|
|
data->client = client;
|
|
data->input_dev = input_dev;
|
|
|
|
if (id->driver_data == MCS5000_TOUCHKEY) {
|
|
data->chip.status_reg = MCS5000_TOUCHKEY_STATUS;
|
|
data->chip.pressbit = MCS5000_TOUCHKEY_STATUS_PRESS;
|
|
data->chip.baseval = MCS5000_TOUCHKEY_BASE_VAL;
|
|
fw_reg = MCS5000_TOUCHKEY_FW;
|
|
} else {
|
|
data->chip.status_reg = MCS5080_TOUCHKEY_STATUS;
|
|
data->chip.pressbit = MCS5080_TOUCHKEY_STATUS_PRESS;
|
|
data->chip.press_invert = 1;
|
|
data->chip.baseval = MCS5080_TOUCHKEY_BASE_VAL;
|
|
fw_reg = MCS5080_TOUCHKEY_FW;
|
|
}
|
|
|
|
fw_ver = i2c_smbus_read_byte_data(client, fw_reg);
|
|
if (fw_ver < 0) {
|
|
error = fw_ver;
|
|
dev_err(&client->dev, "i2c read error[%d]\n", error);
|
|
goto err_free_mem;
|
|
}
|
|
dev_info(&client->dev, "Firmware version: %d\n", fw_ver);
|
|
|
|
input_dev->name = "MELPAS MCS Touchkey";
|
|
input_dev->id.bustype = BUS_I2C;
|
|
input_dev->dev.parent = &client->dev;
|
|
input_dev->evbit[0] = BIT_MASK(EV_KEY);
|
|
if (!pdata->no_autorepeat)
|
|
input_dev->evbit[0] |= BIT_MASK(EV_REP);
|
|
input_dev->keycode = data->keycodes;
|
|
input_dev->keycodesize = sizeof(data->keycodes[0]);
|
|
input_dev->keycodemax = pdata->key_maxval + 1;
|
|
|
|
for (i = 0; i < pdata->keymap_size; i++) {
|
|
unsigned int val = MCS_KEY_VAL(pdata->keymap[i]);
|
|
unsigned int code = MCS_KEY_CODE(pdata->keymap[i]);
|
|
|
|
data->keycodes[val] = code;
|
|
__set_bit(code, input_dev->keybit);
|
|
}
|
|
|
|
input_set_capability(input_dev, EV_MSC, MSC_SCAN);
|
|
input_set_drvdata(input_dev, data);
|
|
|
|
if (pdata->cfg_pin)
|
|
pdata->cfg_pin();
|
|
|
|
if (pdata->poweron) {
|
|
data->poweron = pdata->poweron;
|
|
data->poweron(true);
|
|
}
|
|
|
|
error = request_threaded_irq(client->irq, NULL, mcs_touchkey_interrupt,
|
|
IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
|
|
client->dev.driver->name, data);
|
|
if (error) {
|
|
dev_err(&client->dev, "Failed to register interrupt\n");
|
|
goto err_free_mem;
|
|
}
|
|
|
|
error = input_register_device(input_dev);
|
|
if (error)
|
|
goto err_free_irq;
|
|
|
|
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 error;
|
|
}
|
|
|
|
static int mcs_touchkey_remove(struct i2c_client *client)
|
|
{
|
|
struct mcs_touchkey_data *data = i2c_get_clientdata(client);
|
|
|
|
free_irq(client->irq, data);
|
|
if (data->poweron)
|
|
data->poweron(false);
|
|
input_unregister_device(data->input_dev);
|
|
kfree(data);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void mcs_touchkey_shutdown(struct i2c_client *client)
|
|
{
|
|
struct mcs_touchkey_data *data = i2c_get_clientdata(client);
|
|
|
|
if (data->poweron)
|
|
data->poweron(false);
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int mcs_touchkey_suspend(struct device *dev)
|
|
{
|
|
struct mcs_touchkey_data *data = dev_get_drvdata(dev);
|
|
struct i2c_client *client = data->client;
|
|
|
|
/* Disable the work */
|
|
disable_irq(client->irq);
|
|
|
|
/* Finally turn off the power */
|
|
if (data->poweron)
|
|
data->poweron(false);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mcs_touchkey_resume(struct device *dev)
|
|
{
|
|
struct mcs_touchkey_data *data = dev_get_drvdata(dev);
|
|
struct i2c_client *client = data->client;
|
|
|
|
/* Enable the device first */
|
|
if (data->poweron)
|
|
data->poweron(true);
|
|
|
|
/* Enable irq again */
|
|
enable_irq(client->irq);
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static SIMPLE_DEV_PM_OPS(mcs_touchkey_pm_ops,
|
|
mcs_touchkey_suspend, mcs_touchkey_resume);
|
|
|
|
static const struct i2c_device_id mcs_touchkey_id[] = {
|
|
{ "mcs5000_touchkey", MCS5000_TOUCHKEY },
|
|
{ "mcs5080_touchkey", MCS5080_TOUCHKEY },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, mcs_touchkey_id);
|
|
|
|
static struct i2c_driver mcs_touchkey_driver = {
|
|
.driver = {
|
|
.name = "mcs_touchkey",
|
|
.owner = THIS_MODULE,
|
|
.pm = &mcs_touchkey_pm_ops,
|
|
},
|
|
.probe = mcs_touchkey_probe,
|
|
.remove = mcs_touchkey_remove,
|
|
.shutdown = mcs_touchkey_shutdown,
|
|
.id_table = mcs_touchkey_id,
|
|
};
|
|
|
|
module_i2c_driver(mcs_touchkey_driver);
|
|
|
|
/* Module information */
|
|
MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
|
|
MODULE_AUTHOR("HeungJun Kim <riverful.kim@samsung.com>");
|
|
MODULE_DESCRIPTION("Touchkey driver for MELFAS MCS5000/5080 controller");
|
|
MODULE_LICENSE("GPL");
|