139 lines
2.8 KiB
C
139 lines
2.8 KiB
C
/*
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* AD714X CapTouch Programmable Controller driver (I2C bus)
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*
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* Copyright 2009 Analog Devices Inc.
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*
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* Licensed under the GPL-2 or later.
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*/
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#include <linux/input.h> /* BUS_I2C */
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/pm.h>
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#include "ad714x.h"
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#ifdef CONFIG_PM
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static int ad714x_i2c_suspend(struct device *dev)
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{
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return ad714x_disable(i2c_get_clientdata(to_i2c_client(dev)));
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}
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static int ad714x_i2c_resume(struct device *dev)
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{
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return ad714x_enable(i2c_get_clientdata(to_i2c_client(dev)));
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}
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#endif
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static SIMPLE_DEV_PM_OPS(ad714x_i2c_pm, ad714x_i2c_suspend, ad714x_i2c_resume);
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static int ad714x_i2c_write(struct device *dev, unsigned short reg,
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unsigned short data)
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{
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struct i2c_client *client = to_i2c_client(dev);
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int ret = 0;
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u8 *_reg = (u8 *)®
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u8 *_data = (u8 *)&data;
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u8 tx[4] = {
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_reg[1],
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_reg[0],
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_data[1],
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_data[0]
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};
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ret = i2c_master_send(client, tx, 4);
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if (ret < 0)
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dev_err(&client->dev, "I2C write error\n");
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return ret;
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}
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static int ad714x_i2c_read(struct device *dev, unsigned short reg,
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unsigned short *data)
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{
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struct i2c_client *client = to_i2c_client(dev);
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int ret = 0;
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u8 *_reg = (u8 *)®
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u8 *_data = (u8 *)data;
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u8 tx[2] = {
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_reg[1],
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_reg[0]
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};
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u8 rx[2];
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ret = i2c_master_send(client, tx, 2);
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if (ret >= 0)
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ret = i2c_master_recv(client, rx, 2);
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if (unlikely(ret < 0)) {
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dev_err(&client->dev, "I2C read error\n");
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} else {
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_data[0] = rx[1];
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_data[1] = rx[0];
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}
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return ret;
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}
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static int __devinit ad714x_i2c_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct ad714x_chip *chip;
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chip = ad714x_probe(&client->dev, BUS_I2C, client->irq,
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ad714x_i2c_read, ad714x_i2c_write);
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if (IS_ERR(chip))
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return PTR_ERR(chip);
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i2c_set_clientdata(client, chip);
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return 0;
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}
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static int __devexit ad714x_i2c_remove(struct i2c_client *client)
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{
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struct ad714x_chip *chip = i2c_get_clientdata(client);
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ad714x_remove(chip);
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return 0;
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}
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static const struct i2c_device_id ad714x_id[] = {
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{ "ad7142_captouch", 0 },
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{ "ad7143_captouch", 0 },
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{ "ad7147_captouch", 0 },
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{ "ad7147a_captouch", 0 },
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{ "ad7148_captouch", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, ad714x_id);
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static struct i2c_driver ad714x_i2c_driver = {
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.driver = {
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.name = "ad714x_captouch",
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.pm = &ad714x_i2c_pm,
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},
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.probe = ad714x_i2c_probe,
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.remove = __devexit_p(ad714x_i2c_remove),
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.id_table = ad714x_id,
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};
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static __init int ad714x_i2c_init(void)
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{
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return i2c_add_driver(&ad714x_i2c_driver);
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}
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module_init(ad714x_i2c_init);
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static __exit void ad714x_i2c_exit(void)
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{
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i2c_del_driver(&ad714x_i2c_driver);
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}
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module_exit(ad714x_i2c_exit);
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MODULE_DESCRIPTION("Analog Devices AD714X Capacitance Touch Sensor I2C Bus Driver");
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MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
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MODULE_LICENSE("GPL");
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