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/*
* Source for:
* Cypress TrueTouch(TM) Standard Product (TTSP) I2C touchscreen driver.
* For use with Cypress Txx3xx parts.
* Supported parts include:
* CY8CTST341
* CY8CTMA340
*
* Copyright (C) 2009, 2010, 2011 Cypress Semiconductor, Inc.
* Copyright (C) 2012 Javier Martinez Canillas <javier@dowhile0.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2, and only version 2, as published by the
* Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Contact Cypress Semiconductor at www.cypress.com <kev@cypress.com>
*
*/
#include "cyttsp_core.h"
#include <linux/i2c.h>
#include <linux/input.h>
#define CY_I2C_DATA_SIZE 128
static int cyttsp_i2c_read_block_data(struct cyttsp *ts,
u8 addr, u8 length, void *values)
{
struct i2c_client *client = to_i2c_client(ts->dev);
struct i2c_msg msgs[] = {
{
.addr = client->addr,
.flags = 0,
.len = 1,
.buf = &addr,
},
{
.addr = client->addr,
.flags = I2C_M_RD,
.len = length,
.buf = values,
},
};
int retval;
retval = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
if (retval < 0)
return retval;
return retval != ARRAY_SIZE(msgs) ? -EIO : 0;
}
static int cyttsp_i2c_write_block_data(struct cyttsp *ts,
u8 addr, u8 length, const void *values)
{
struct i2c_client *client = to_i2c_client(ts->dev);
int retval;
ts->xfer_buf[0] = addr;
memcpy(&ts->xfer_buf[1], values, length);
retval = i2c_master_send(client, ts->xfer_buf, length + 1);
return retval < 0 ? retval : 0;
}
static const struct cyttsp_bus_ops cyttsp_i2c_bus_ops = {
.bustype = BUS_I2C,
.write = cyttsp_i2c_write_block_data,
.read = cyttsp_i2c_read_block_data,
};
static int cyttsp_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct cyttsp *ts;
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
dev_err(&client->dev, "I2C functionality not Supported\n");
return -EIO;
}
ts = cyttsp_probe(&cyttsp_i2c_bus_ops, &client->dev, client->irq,
CY_I2C_DATA_SIZE);
if (IS_ERR(ts))
return PTR_ERR(ts);
i2c_set_clientdata(client, ts);
return 0;
}
static int cyttsp_i2c_remove(struct i2c_client *client)
{
struct cyttsp *ts = i2c_get_clientdata(client);
cyttsp_remove(ts);
return 0;
}
static const struct i2c_device_id cyttsp_i2c_id[] = {
{ CY_I2C_NAME, 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, cyttsp_i2c_id);
static struct i2c_driver cyttsp_i2c_driver = {
.driver = {
.name = CY_I2C_NAME,
.owner = THIS_MODULE,
.pm = &cyttsp_pm_ops,
},
.probe = cyttsp_i2c_probe,
.remove = cyttsp_i2c_remove,
.id_table = cyttsp_i2c_id,
};
module_i2c_driver(cyttsp_i2c_driver);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Cypress TrueTouch(R) Standard Product (TTSP) I2C driver");
MODULE_AUTHOR("Cypress");
MODULE_ALIAS("i2c:cyttsp");
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