119 lines
2.6 KiB
C
119 lines
2.6 KiB
C
/*
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* AD7879-1/AD7889-1 touchscreen (I2C bus)
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*
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* Copyright (C) 2008-2010 Michael Hennerich, 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/of.h>
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#include <linux/pm.h>
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#include "ad7879.h"
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#define AD7879_DEVID 0x79 /* AD7879-1/AD7889-1 */
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/* All registers are word-sized.
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* AD7879 uses a high-byte first convention.
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*/
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static int ad7879_i2c_read(struct device *dev, u8 reg)
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{
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struct i2c_client *client = to_i2c_client(dev);
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return i2c_smbus_read_word_swapped(client, reg);
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}
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static int ad7879_i2c_multi_read(struct device *dev,
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u8 first_reg, u8 count, u16 *buf)
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{
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struct i2c_client *client = to_i2c_client(dev);
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u8 idx;
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i2c_smbus_read_i2c_block_data(client, first_reg, count * 2, (u8 *)buf);
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for (idx = 0; idx < count; ++idx)
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buf[idx] = swab16(buf[idx]);
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return 0;
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}
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static int ad7879_i2c_write(struct device *dev, u8 reg, u16 val)
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{
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struct i2c_client *client = to_i2c_client(dev);
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return i2c_smbus_write_word_swapped(client, reg, val);
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}
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static const struct ad7879_bus_ops ad7879_i2c_bus_ops = {
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.bustype = BUS_I2C,
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.read = ad7879_i2c_read,
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.multi_read = ad7879_i2c_multi_read,
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.write = ad7879_i2c_write,
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};
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static int ad7879_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 ad7879 *ts;
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if (!i2c_check_functionality(client->adapter,
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I2C_FUNC_SMBUS_WORD_DATA)) {
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dev_err(&client->dev, "SMBUS Word Data not Supported\n");
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return -EIO;
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}
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ts = ad7879_probe(&client->dev, AD7879_DEVID, client->irq,
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&ad7879_i2c_bus_ops);
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if (IS_ERR(ts))
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return PTR_ERR(ts);
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i2c_set_clientdata(client, ts);
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return 0;
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}
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static int ad7879_i2c_remove(struct i2c_client *client)
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{
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struct ad7879 *ts = i2c_get_clientdata(client);
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ad7879_remove(ts);
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return 0;
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}
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static const struct i2c_device_id ad7879_id[] = {
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{ "ad7879", 0 },
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{ "ad7889", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, ad7879_id);
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#ifdef CONFIG_OF
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static const struct of_device_id ad7879_i2c_dt_ids[] = {
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{ .compatible = "adi,ad7879-1", },
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{ }
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};
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MODULE_DEVICE_TABLE(of, ad7879_i2c_dt_ids);
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#endif
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static struct i2c_driver ad7879_i2c_driver = {
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.driver = {
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.name = "ad7879",
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.pm = &ad7879_pm_ops,
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.of_match_table = of_match_ptr(ad7879_i2c_dt_ids),
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},
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.probe = ad7879_i2c_probe,
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.remove = ad7879_i2c_remove,
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.id_table = ad7879_id,
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};
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module_i2c_driver(ad7879_i2c_driver);
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MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
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MODULE_DESCRIPTION("AD7879(-1) touchscreen I2C bus driver");
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MODULE_LICENSE("GPL");
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