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/*
*
* FocalTech TouchScreen driver.
*
* Copyright (c) 2010-2016, FocalTech Systems, Ltd., all rights reserved.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* 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.
*
*/
/************************************************************************
*
* File Name: focaltech_i2c.c
*
* Author: fupeipei
*
* Created: 2016-08-04
*
* Abstract: i2c communication with TP
*
* Version: v1.0
*
* Revision History:
* v1.0:
* First release. By fupeipei 2016-08-04
************************************************************************/
/*****************************************************************************
* Included header files
*****************************************************************************/
#include "focaltech_core.h"
/*****************************************************************************
* Private constant and macro definitions using #define
*****************************************************************************/
/*****************************************************************************
* Private enumerations, structures and unions using typedef
*****************************************************************************/
/*****************************************************************************
* Static variables
*****************************************************************************/
static DEFINE_MUTEX(i2c_rw_access);
/*****************************************************************************
* Global variable or extern global variabls/functions
*****************************************************************************/
/*****************************************************************************
* Static function prototypes
*****************************************************************************/
/*****************************************************************************
* functions body
*****************************************************************************/
/************************************************************************
* Name: fts_i2c_read
* Brief: i2c read
* Input: i2c info, write buf, write len, read buf, read len
* Output: get data in the 3rd buf
* Return: fail <0
***********************************************************************/
int fts_i2c_read(struct i2c_client *client, char *writebuf, int writelen,
char *readbuf, int readlen)
{
int ret = 0;
mutex_lock(&i2c_rw_access);
if (readlen > 0) {
if (writelen > 0) {
struct i2c_msg msgs[] = {
{
.addr = client->addr,
.flags = 0,
.len = writelen,
.buf = writebuf,
},
{
.addr = client->addr,
.flags = I2C_M_RD,
.len = readlen,
.buf = readbuf,
},
};
ret = i2c_transfer(client->adapter, msgs, 2);
if (ret < 0) {
FTS_ERROR("[IIC]: i2c_transfer(write)"
"error,ret=%d!!", ret);
}
} else {
struct i2c_msg msgs[] = {
{
.addr = client->addr,
.flags = I2C_M_RD,
.len = readlen,
.buf = readbuf,
},
};
ret = i2c_transfer(client->adapter, msgs, 1);
if (ret < 0) {
FTS_ERROR("[IIC]: i2c_transfer(read)"
"error, ret=%d!!", ret);
}
}
}
mutex_unlock(&i2c_rw_access);
return ret;
}
/************************************************************************
* Name: fts_i2c_write
* Brief: i2c write
* Input: i2c info, write buf, write len
* Output: no
* Return: fail <0
***********************************************************************/
int fts_i2c_write(struct i2c_client *client, char *writebuf, int writelen)
{
int ret = 0;
mutex_lock(&i2c_rw_access);
if (writelen > 0) {
struct i2c_msg msgs[] = {
{
.addr = client->addr,
.flags = 0,
.len = writelen,
.buf = writebuf,
},
};
ret = i2c_transfer(client->adapter, msgs, 1);
if (ret < 0) {
FTS_ERROR("%s: i2c_transfer(write) error, ret=%d",
__func__, ret);
}
}
mutex_unlock(&i2c_rw_access);
return ret;
}
/************************************************************************
* Name: fts_i2c_write_reg
* Brief: write register
* Input: i2c info, reg address, reg value
* Output: no
* Return: fail <0
***********************************************************************/
int fts_i2c_write_reg(struct i2c_client *client, u8 regaddr, u8 regvalue)
{
u8 buf[2] = { 0 };
buf[0] = regaddr;
buf[1] = regvalue;
return fts_i2c_write(client, buf, sizeof(buf));
}
/************************************************************************
* Name: fts_i2c_read_reg
* Brief: read register
* Input: i2c info, reg address, reg value
* Output: get reg value
* Return: fail <0
***********************************************************************/
int fts_i2c_read_reg(struct i2c_client *client, u8 regaddr, u8 *regvalue)
{
return fts_i2c_read(client, ®addr, 1, regvalue, 1);
}
/************************************************************************
* Name: fts_i2c_init
* Brief: fts i2c init
* Input:
* Output:
* Return:
***********************************************************************/
int fts_i2c_init(void)
{
FTS_FUNC_ENTER();
FTS_FUNC_EXIT();
return 0;
}
/************************************************************************
* Name: fts_i2c_exit
* Brief: fts i2c exit
* Input:
* Output:
* Return:
***********************************************************************/
int fts_i2c_exit(void)
{
FTS_FUNC_ENTER();
FTS_FUNC_EXIT();
return 0;
}
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