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9eff794b77
The interrupt status registers should be read in row to avoid invalid data. Alter "read" method for both bus options to allow reading several registers in a row and make sure we read interrupt status registers properly. Read sequence saves 50% of bus transactions compared to single register reads. So use it also for the result registers, which are also located in a row. Also update copyright notice. Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
134 lines
3.0 KiB
C
134 lines
3.0 KiB
C
/*
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* AD714X CapTouch Programmable Controller driver (I2C bus)
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*
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* Copyright 2009-2011 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 ad714x_chip *chip,
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unsigned short reg, unsigned short data)
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{
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struct i2c_client *client = to_i2c_client(chip->dev);
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int error;
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chip->xfer_buf[0] = cpu_to_be16(reg);
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chip->xfer_buf[1] = cpu_to_be16(data);
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error = i2c_master_send(client, (u8 *)chip->xfer_buf,
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2 * sizeof(*chip->xfer_buf));
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if (unlikely(error < 0)) {
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dev_err(&client->dev, "I2C write error: %d\n", error);
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return error;
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}
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return 0;
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}
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static int ad714x_i2c_read(struct ad714x_chip *chip,
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unsigned short reg, unsigned short *data, size_t len)
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{
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struct i2c_client *client = to_i2c_client(chip->dev);
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int i;
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int error;
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chip->xfer_buf[0] = cpu_to_be16(reg);
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error = i2c_master_send(client, (u8 *)chip->xfer_buf,
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sizeof(*chip->xfer_buf));
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if (error >= 0)
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error = i2c_master_recv(client, (u8 *)chip->xfer_buf,
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len * sizeof(*chip->xfer_buf));
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if (unlikely(error < 0)) {
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dev_err(&client->dev, "I2C read error: %d\n", error);
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return error;
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}
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for (i = 0; i < len; i++)
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data[i] = be16_to_cpu(chip->xfer_buf[i]);
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return 0;
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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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