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/*
* AD7879-1/AD7889-1 touchscreen (I2C bus)
*
* Copyright (C) 2008-2010 Michael Hennerich, Analog Devices Inc.
*
* Licensed under the GPL-2 or later.
*/
#include <linux/input.h> /* BUS_I2C */
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/pm.h>
#include <linux/spi/ad7879.h>
#include "ad7879.h"
#define AD7879_DEVID 0x79 /* AD7879-1/AD7889-1 */
/* All registers are word-sized.
* AD7879 uses a high-byte first convention.
*/
static int ad7879_i2c_read(struct device *dev, u8 reg)
{
struct i2c_client *client = to_i2c_client(dev);
return i2c_smbus_read_word_swapped(client, reg);
}
static int ad7879_i2c_multi_read(struct device *dev,
u8 first_reg, u8 count, u16 *buf)
{
struct i2c_client *client = to_i2c_client(dev);
u8 idx;
i2c_smbus_read_i2c_block_data(client, first_reg, count * 2, (u8 *)buf);
for (idx = 0; idx < count; ++idx)
buf[idx] = swab16(buf[idx]);
return 0;
}
static int ad7879_i2c_write(struct device *dev, u8 reg, u16 val)
{
struct i2c_client *client = to_i2c_client(dev);
return i2c_smbus_write_word_swapped(client, reg, val);
}
static const struct ad7879_bus_ops ad7879_i2c_bus_ops = {
.bustype = BUS_I2C,
.read = ad7879_i2c_read,
.multi_read = ad7879_i2c_multi_read,
.write = ad7879_i2c_write,
};
static struct ad7879_platform_data *ad7879_parse_dt(struct device *dev)
{
struct ad7879_platform_data *pdata;
struct device_node *np = dev->of_node;
u32 tmp;
if (!np)
return NULL;
pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata) {
dev_err(dev, "failed to allocate platform data\n");
return NULL;
}
if (of_property_read_u32(np, "resistance-plate-x", &tmp)) {
dev_err(dev, "failed to get resistance-plate-x property\n");
return NULL;
}
pdata->x_plate_ohms = (u16)tmp;
if (of_property_read_u32(np, "touchscreen-min-pressure", &tmp)) {
dev_err(dev, "failed to get touchscreen-min-pressure property\n");
return NULL;
}
pdata->pressure_min = (u16)tmp;
if (of_property_read_u32(np, "touchscreen-max-pressure", &tmp)) {
dev_err(dev, "failed to get touchscreen-max-pressure property\n");
return NULL;
}
pdata->pressure_min = (u16)tmp;
of_property_read_u8(np, "first-conversion-delay", &pdata->first_conversion_delay);
of_property_read_u8(np, "acquisition-time", &pdata->acquisition_time);
of_property_read_u8(np, "median-filter-size", &pdata->median);
of_property_read_u8(np, "averaging", &pdata->averaging);
of_property_read_u8(np, "conversion-interval", &pdata->pen_down_acc_interval);
pdata->swap_xy = of_property_read_bool(np, "touchscreen-swapped-x-y");
return pdata;
}
static int ad7879_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct ad7879_platform_data *pdata;
struct ad7879 *ts;
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_WORD_DATA)) {
dev_err(&client->dev, "SMBUS Word Data not Supported\n");
return -EIO;
}
pdata = dev_get_platdata(&client->dev);
if (!pdata && IS_ENABLED(CONFIG_OF))
pdata = ad7879_parse_dt(&client->dev);
if (!pdata) {
dev_err(&client->dev, "Need platform data\n");
return -EINVAL;
}
ts = ad7879_probe(&client->dev, AD7879_DEVID, client->irq, pdata,
&ad7879_i2c_bus_ops);
if (IS_ERR(ts))
return PTR_ERR(ts);
i2c_set_clientdata(client, ts);
return 0;
}
static int ad7879_i2c_remove(struct i2c_client *client)
{
struct ad7879 *ts = i2c_get_clientdata(client);
ad7879_remove(ts);
return 0;
}
static const struct i2c_device_id ad7879_id[] = {
{ "ad7879", 0 },
{ "ad7889", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, ad7879_id);
#ifdef CONFIG_OF
static const struct of_device_id ad7879_dt_ids[] = {
{ .compatible = "adi,ad7879-1", },
{ }
};
MODULE_DEVICE_TABLE(of, st1232_ts_dt_ids);
#endif
static struct i2c_driver ad7879_i2c_driver = {
.driver = {
.name = "ad7879",
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(ad7879_dt_ids),
.pm = &ad7879_pm_ops,
},
.probe = ad7879_i2c_probe,
.remove = ad7879_i2c_remove,
.id_table = ad7879_id,
};
module_i2c_driver(ad7879_i2c_driver);
MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
MODULE_DESCRIPTION("AD7879(-1) touchscreen I2C bus driver");
MODULE_LICENSE("GPL");
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