288 lines
7.3 KiB
C
288 lines
7.3 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2016 MediaTek Inc.
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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 DMA_BUFFER_LENGTH 256
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#define I2C_RETRY_NUMBER 3
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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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#ifdef CONFIG_MTK_I2C_EXTENSION
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u8 *g_dma_buff_va;
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dma_addr_t g_dma_buff_pa;
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#endif
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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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#ifdef CONFIG_MTK_I2C_EXTENSION
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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 i2c_client *client = NULL;
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/* must have data when read */
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if (!fts_data || !fts_data->client || !data || !datalen) {
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FTS_ERROR("fts_data/client/data/datalen(%d) is invalid",
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datalen);
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return -EINVAL;
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}
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client = fts_data->client;
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mutex_lock(&fts_data->bus_lock);
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if ((writelen > 0) && (writelen <= DMA_BUFFER_LENGTH)) {
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memcpy(g_dma_buff_va, cmd, cmdlen);
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client->addr = ((client->addr & I2C_MASK_FLAG) | I2C_DMA_FLAG);
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for (i = 0; i < I2C_RETRY_NUMBER; i++) {
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ret = i2c_master_send(client,
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(unsigned char *)g_dma_buff_pa,
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writelen);
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if (ret != writelen) {
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FTS_ERROR(
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"[IIC]: i2c_master_send failed, ret=%d!!",
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ret);
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} else
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break;
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}
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client->addr = client->addr & I2C_MASK_FLAG & (~I2C_DMA_FLAG);
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}
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if ((readlen > 0) && (readlen <= DMA_BUFFER_LENGTH)) {
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client->addr = ((client->addr & I2C_MASK_FLAG) | I2C_DMA_FLAG);
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for (i = 0; i < I2C_RETRY_NUMBER; i++) {
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ret = i2c_master_recv(client,
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(unsigned char *)g_dma_buff_pa,
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datalen);
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if (ret != readlen)
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FTS_ERROR("i2c_master_recv failed,ret=%d", ret);
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else
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break;
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}
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memcpy(data, g_dma_buff_va, readlen);
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client->addr = client->addr & I2C_MASK_FLAG & (~I2C_DMA_FLAG);
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} else
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FTS_ERROR("i2c read len(%d) fail", readlen);
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mutex_unlock(&fts_data->bus_lock);
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return ret;
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}
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int fts_i2c_write(u8 *writebuf, int writelen)
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{
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int ret = 0;
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int i = 0;
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struct i2c_client *client = NULL;
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if (!fts_data || !fts_data->client || !writebuf || !writelen) {
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FTS_ERROR("fts_data/client/data/datalen(%d) is invalid",
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writelen);
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return -EINVAL;
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}
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client = fts_data->client;
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mutex_lock(&fts_data->bus_lock);
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if ((writelen > 0) && (writelen <= DMA_BUFFER_LENGTH)) {
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memcpy(g_dma_buff_va, writebuf, writelen);
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client->addr = ((client->addr & I2C_MASK_FLAG) | I2C_DMA_FLAG);
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for (i = 0; i < I2C_RETRY_NUMBER; i++) {
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ret = i2c_master_send(client,
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(unsigned char *)g_dma_buff_pa,
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writelen);
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if (ret != writelen)
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FTS_ERROR("i2c_master_send failed,ret=%d", ret);
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else
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break;
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}
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client->addr = client->addr & I2C_MASK_FLAG & (~I2C_DMA_FLAG);
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} else
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FTS_ERROR("i2c write len(%d) fail", writelen);
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mutex_unlock(&fts_data->bus_lock);
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return ret;
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}
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static void fts_i2c_msg_dma_alloct(void)
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{
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FTS_FUNC_ENTER();
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if (g_dma_buff_va == NULL) {
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fts_data->input_dev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
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g_dma_buff_va = (u8 *)dma_alloc_coherent(
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&fts_data->input_dev->dev, DMA_BUFFER_LENGTH,
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&g_dma_buff_pa, GFP_KERNEL);
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if (!g_dma_buff_va)
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FTS_ERROR("Allocate DMA I2C Buffer failed");
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}
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FTS_FUNC_EXIT();
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}
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static void fts_i2c_msg_dma_release(void)
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{
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FTS_FUNC_ENTER();
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if (g_dma_buff_va) {
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dma_free_coherent(NULL, DMA_BUFFER_LENGTH, g_dma_buff_va,
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g_dma_buff_pa);
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g_dma_buff_va = NULL;
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g_dma_buff_pa = 0;
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FTS_ERROR("[IIC]: Allocated DMA I2C Buffer release!!");
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}
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FTS_FUNC_EXIT();
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}
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#else
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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 i2c_client *client = NULL;
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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 (!fts_data || !fts_data->client || !data || !datalen) {
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FTS_ERROR("fts_data/client/data/datalen(%d) is invalid",
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datalen);
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return -EINVAL;
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}
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client = fts_data->client;
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mutex_lock(&fts_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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msg_list[0].addr = 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 = cmd;
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msg_list[1].addr = 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 = data;
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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(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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break;
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}
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mutex_unlock(&fts_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 i2c_client *client = NULL;
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struct i2c_msg msgs;
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if (!fts_data || !fts_data->client || !writebuf || !writelen) {
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FTS_ERROR("fts_data/client/data/datalen(%d) is invalid",
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writelen);
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return -EINVAL;
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}
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client = fts_data->client;
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mutex_lock(&fts_data->bus_lock);
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memset(&msgs, 0, sizeof(struct i2c_msg));
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msgs.addr = client->addr;
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msgs.flags = 0;
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msgs.len = writelen;
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msgs.buf = writebuf;
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for (i = 0; i < I2C_RETRY_NUMBER; i++) {
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ret = i2c_transfer(client->adapter, &msgs, 1);
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if (ret < 0)
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FTS_ERROR("i2c_transfer(write) fail,reg:%d", ret);
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else
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break;
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}
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mutex_unlock(&fts_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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#endif
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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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#ifdef CONFIG_MTK_I2C_EXTENSION
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fts_i2c_msg_dma_alloct();
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#endif
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ts_data->bus_buf = NULL;
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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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#ifdef CONFIG_MTK_I2C_EXTENSION
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fts_i2c_msg_dma_release();
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#endif
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FTS_FUNC_EXIT();
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return 0;
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}
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