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