fa6e3ca274
Add device tree support for the I2C and SPI variant of AD7879(-1). This allows to specify the touchscreen controller as a I2C client node or SPI slave device. Most of the options available in platform data are also available as device tree properties, the only exception being GPIO capabilities, which can not be activated through device tree currently. Signed-off-by: Stefan Agner <stefan@agner.ch> Acked-by: Rob Herring <robh@kernel.org> Acked-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
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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