diff options
Diffstat (limited to 'drivers/input/touchscreen/focaltech_touch/focaltech_i2c.c')
| -rw-r--r-- | drivers/input/touchscreen/focaltech_touch/focaltech_i2c.c | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/focaltech_touch/focaltech_i2c.c b/drivers/input/touchscreen/focaltech_touch/focaltech_i2c.c new file mode 100644 index 000000000000..75cd917eae2b --- /dev/null +++ b/drivers/input/touchscreen/focaltech_touch/focaltech_i2c.c @@ -0,0 +1,209 @@ +/* + * + * 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; +} |