linux/drivers/input/touchscreen/cyttsp_i2c_common.c
Ferruh Yigit 62f548d0c2 Input: cyttsp4 - use 16bit address for I2C/SPI communication
In TSG4, register map is 512bytes long and to access all of it,
one bit from address byte is used (which bit to use differs for
I2C and SPI);

Since common code used for TSG3 and TSG4 for I2C, this parameter
wrongly used as u8. TSG3 does not access beyond 255 bytes
but TSG4 may.

Tested-on:TMA3XX DVB && TMA4XX DVB

Signed-off-by: Ferruh Yigit <fery@cypress.com>
Acked-by: Javier Martinez Canillas <javier@dowhile0.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
2013-07-06 21:57:06 -07:00

94 lines
2.3 KiB
C

/*
* cyttsp_i2c_common.c
* Cypress TrueTouch(TM) Standard Product (TTSP) I2C touchscreen driver.
* For use with Cypress Txx3xx and Txx4xx parts.
* Supported parts include:
* CY8CTST341
* CY8CTMA340
* TMA4XX
* TMA1036
*
* 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.
*
* Contact Cypress Semiconductor at www.cypress.com <ttdrivers@cypress.com>
*
*/
#include <linux/device.h>
#include <linux/export.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/types.h>
int cyttsp_i2c_read_block_data(struct device *dev, u8 *xfer_buf,
u16 addr, u8 length, void *values)
{
struct i2c_client *client = to_i2c_client(dev);
u8 client_addr = client->addr | ((addr >> 8) & 0x1);
u8 addr_lo = addr & 0xFF;
struct i2c_msg msgs[] = {
{
.addr = client_addr,
.flags = 0,
.len = 1,
.buf = &addr_lo,
},
{
.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;
}
EXPORT_SYMBOL_GPL(cyttsp_i2c_read_block_data);
int cyttsp_i2c_write_block_data(struct device *dev, u8 *xfer_buf,
u16 addr, u8 length, const void *values)
{
struct i2c_client *client = to_i2c_client(dev);
u8 client_addr = client->addr | ((addr >> 8) & 0x1);
u8 addr_lo = addr & 0xFF;
struct i2c_msg msgs[] = {
{
.addr = client_addr,
.flags = 0,
.len = length + 1,
.buf = xfer_buf,
},
};
int retval;
xfer_buf[0] = addr_lo;
memcpy(&xfer_buf[1], values, length);
retval = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
if (retval < 0)
return retval;
return retval != ARRAY_SIZE(msgs) ? -EIO : 0;
}
EXPORT_SYMBOL_GPL(cyttsp_i2c_write_block_data);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Cypress");