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fbae3fb154
I2C drivers can use the clientdata-pointer to point to private data. As I2C
devices are not really unregistered, but merely detached from their driver, it
used to be the drivers obligation to clear this pointer during remove() or a
failed probe(). As a couple of drivers forgot to do this, it was agreed that it
was cleaner if the i2c-core does this clearance when appropriate, as there is
no guarantee for the lifetime of the clientdata-pointer after remove() anyhow.
This feature was added to the core with commit
e4a7b9b04d to fix the faulty drivers.
As there is no need anymore to clear the clientdata-pointer, remove all current
occurrences in the drivers to simplify the code and prevent confusion.
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Acked-by: Richard Purdie <rpurdie@linux.intel.com>
Acked-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
140 lines
2.8 KiB
C
140 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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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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},
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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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