/*
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*
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* FocalTech TouchScreen driver.
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*
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* Copyright (c) 2012-2019, FocalTech Systems, Ltd., all rights reserved.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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/************************************************************************
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*
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* File Name: focaltech_i2c.c
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*
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* Author: Focaltech Driver Team
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*
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* Created: 2016-08-04
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*
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* Abstract: i2c communication with TP
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*
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* Version: v1.0
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*
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* Revision History:
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*
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************************************************************************/
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/*****************************************************************************
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* Included header files
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*****************************************************************************/
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#include "focaltech_core.h"
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/*****************************************************************************
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* Private constant and macro definitions using #define
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*****************************************************************************/
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#define I2C_RETRY_NUMBER 3
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#define I2C_BUF_LENGTH 256
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/*****************************************************************************
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* Private enumerations, structures and unions using typedef
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*****************************************************************************/
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/*****************************************************************************
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* Static variables
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*****************************************************************************/
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/*****************************************************************************
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* Global variable or extern global variabls/functions
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*****************************************************************************/
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/*****************************************************************************
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* Static function prototypes
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*****************************************************************************/
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/*****************************************************************************
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* functions body
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*****************************************************************************/
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int fts_read(u8 *cmd, u32 cmdlen, u8 *data, u32 datalen)
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{
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int ret = 0;
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int i = 0;
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struct fts_ts_data *ts_data = fts_data;
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struct i2c_msg msg_list[2];
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struct i2c_msg *msg = NULL;
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int msg_num = 0;
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/* must have data when read */
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if (!ts_data || !ts_data->client || !data || !datalen
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|| (datalen >= I2C_BUF_LENGTH) || (cmdlen >= I2C_BUF_LENGTH)) {
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FTS_ERROR("fts_data/client/cmdlen(%d)/data/datalen(%d) is invalid",
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cmdlen, datalen);
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return -EINVAL;
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}
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mutex_lock(&ts_data->bus_lock);
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memset(&msg_list[0], 0, sizeof(struct i2c_msg));
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memset(&msg_list[1], 0, sizeof(struct i2c_msg));
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memcpy(ts_data->bus_tx_buf, cmd, cmdlen);
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msg_list[0].addr = ts_data->client->addr;
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msg_list[0].flags = 0;
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msg_list[0].len = cmdlen;
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msg_list[0].buf = ts_data->bus_tx_buf;
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msg_list[1].addr = ts_data->client->addr;
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msg_list[1].flags = I2C_M_RD;
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msg_list[1].len = datalen;
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msg_list[1].buf = ts_data->bus_rx_buf;
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if (cmd && cmdlen) {
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msg = &msg_list[0];
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msg_num = 2;
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} else {
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msg = &msg_list[1];
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msg_num = 1;
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}
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for (i = 0; i < I2C_RETRY_NUMBER; i++) {
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ret = i2c_transfer(ts_data->client->adapter, msg, msg_num);
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if (ret < 0) {
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FTS_ERROR("i2c_transfer(read) fail,ret:%d", ret);
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} else {
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memcpy(data, ts_data->bus_rx_buf, datalen);
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break;
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}
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}
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mutex_unlock(&ts_data->bus_lock);
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return ret;
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}
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int fts_write(u8 *writebuf, u32 writelen)
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{
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int ret = 0;
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int i = 0;
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struct fts_ts_data *ts_data = fts_data;
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struct i2c_msg msgs;
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if (!ts_data || !ts_data->client || !writebuf || !writelen
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|| (writelen >= I2C_BUF_LENGTH)) {
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FTS_ERROR("fts_data/client/data/datalen(%d) is invalid", writelen);
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return -EINVAL;
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}
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mutex_lock(&ts_data->bus_lock);
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memset(&msgs, 0, sizeof(struct i2c_msg));
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memcpy(ts_data->bus_tx_buf, writebuf, writelen);
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msgs.addr = ts_data->client->addr;
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msgs.flags = 0;
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msgs.len = writelen;
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msgs.buf = ts_data->bus_tx_buf;
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for (i = 0; i < I2C_RETRY_NUMBER; i++) {
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ret = i2c_transfer(ts_data->client->adapter, &msgs, 1);
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if (ret < 0) {
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FTS_ERROR("i2c_transfer(write) fail,ret:%d", ret);
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} else {
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break;
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}
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}
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mutex_unlock(&ts_data->bus_lock);
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return ret;
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}
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int fts_read_reg(u8 addr, u8 *value)
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{
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return fts_read(&addr, 1, value, 1);
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}
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int fts_write_reg(u8 addr, u8 value)
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{
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u8 buf[2] = { 0 };
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buf[0] = addr;
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buf[1] = value;
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return fts_write(buf, sizeof(buf));
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}
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int fts_bus_init(struct fts_ts_data *ts_data)
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{
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FTS_FUNC_ENTER();
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ts_data->bus_tx_buf = kzalloc(I2C_BUF_LENGTH, GFP_KERNEL);
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if (NULL == ts_data->bus_tx_buf) {
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FTS_ERROR("failed to allocate memory for bus_tx_buf");
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return -ENOMEM;
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}
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ts_data->bus_rx_buf = kzalloc(I2C_BUF_LENGTH, GFP_KERNEL);
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if (NULL == ts_data->bus_rx_buf) {
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FTS_ERROR("failed to allocate memory for bus_rx_buf");
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return -ENOMEM;
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}
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FTS_FUNC_EXIT();
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return 0;
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}
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int fts_bus_exit(struct fts_ts_data *ts_data)
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{
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FTS_FUNC_ENTER();
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if (ts_data && ts_data->bus_tx_buf) {
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kfree(ts_data->bus_tx_buf);
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ts_data->bus_tx_buf = NULL;
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}
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if (ts_data && ts_data->bus_rx_buf) {
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kfree(ts_data->bus_rx_buf);
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ts_data->bus_rx_buf = NULL;
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}
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FTS_FUNC_EXIT();
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return 0;
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}
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