31a6296333
AD7142 and AD7147 are integrated capacitance-to-digital converters (CDCs) with on-chip environmental calibration for use in systems requiring a novel user input method. The AD7142 and AD7147 can interface to external capacitance sensors implementing functions such as buttons, scrollwheels, sliders, touchpads and so on. The chips don't restrict the specific usage. Depending on the hardware connection, one special target board can include one or several these components. The platform_data for the device's "struct device" holds these information. The data-struct defined in head file descript the hardware feature of button/scrollwheel/slider/touchpad components on target boards, which need be filled in the arch/mach-/. As the result, the driver is independent of boards. It gets the components layout from the platform_data, registers related devices, fullfills the algorithms and state machines for these components and report related input events to up level. Signed-off-by: Bryan Wu <cooloney@kernel.org> Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Barry Song <21cnbao@gmail.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
138 lines
2.8 KiB
C
138 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 "ad714x.h"
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#ifdef CONFIG_PM
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static int ad714x_i2c_suspend(struct i2c_client *client, pm_message_t message)
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{
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return ad714x_disable(i2c_get_clientdata(client));
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}
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static int ad714x_i2c_resume(struct i2c_client *client)
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{
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return ad714x_enable(i2c_get_clientdata(client));
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}
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#else
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# define ad714x_i2c_suspend NULL
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# define ad714x_i2c_resume NULL
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#endif
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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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i2c_set_clientdata(client, NULL);
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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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{ "ad7147_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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},
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.probe = ad714x_i2c_probe,
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.remove = __devexit_p(ad714x_i2c_remove),
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.suspend = ad714x_i2c_suspend,
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.resume = ad714x_i2c_resume,
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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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