106 lines
2.6 KiB
C
106 lines
2.6 KiB
C
/* Copyright (c) 2012, The Linux Foundation. All rights reserved.
|
|
*
|
|
* 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.
|
|
*
|
|
*/
|
|
#include <linux/i2c.h>
|
|
#include <linux/mhl_8334.h>
|
|
|
|
#include "mhl_i2c_utils.h"
|
|
|
|
uint8_t slave_addrs[MAX_PAGES] = {
|
|
DEV_PAGE_TPI_0 ,
|
|
DEV_PAGE_TX_L0_0 ,
|
|
DEV_PAGE_TX_L1_0 ,
|
|
DEV_PAGE_TX_2_0 ,
|
|
DEV_PAGE_TX_3_0 ,
|
|
DEV_PAGE_CBUS ,
|
|
DEV_PAGE_DDC_EDID ,
|
|
DEV_PAGE_DDC_SEGM ,
|
|
};
|
|
|
|
int mhl_i2c_reg_read(uint8_t slave_addr_index, uint8_t reg_offset)
|
|
{
|
|
struct i2c_msg msgs[2];
|
|
uint8_t buffer = 0;
|
|
int ret = -1;
|
|
|
|
pr_debug("MRR: Reading from slave_addr_index=[%x] and offset=[%x]\n",
|
|
slave_addr_index, reg_offset);
|
|
pr_debug("MRR: Addr slave_addr_index=[%x]\n",
|
|
slave_addrs[slave_addr_index]);
|
|
|
|
/* Slave addr */
|
|
msgs[0].addr = slave_addrs[slave_addr_index] >> 1;
|
|
msgs[1].addr = slave_addrs[slave_addr_index] >> 1;
|
|
|
|
/* Write Command */
|
|
msgs[0].flags = 0;
|
|
msgs[1].flags = I2C_M_RD;
|
|
|
|
/* Register offset for the next transaction */
|
|
msgs[0].buf = ®_offset;
|
|
msgs[1].buf = &buffer;
|
|
|
|
/* Offset is 1 Byte long */
|
|
msgs[0].len = 1;
|
|
msgs[1].len = 1;
|
|
|
|
ret = i2c_transfer(mhl_msm_state->i2c_client->adapter, msgs, 2);
|
|
if (ret < 1) {
|
|
pr_err("I2C READ FAILED=[%d]\n", ret);
|
|
return -EACCES;
|
|
}
|
|
pr_debug("Buffer is [%x]\n", buffer);
|
|
return buffer;
|
|
}
|
|
|
|
|
|
int mhl_i2c_reg_write(uint8_t slave_addr_index, uint8_t reg_offset,
|
|
uint8_t value)
|
|
{
|
|
return mhl_i2c_reg_write_cmds(slave_addr_index, reg_offset, &value, 1);
|
|
}
|
|
|
|
int mhl_i2c_reg_write_cmds(uint8_t slave_addr_index, uint8_t reg_offset,
|
|
uint8_t *value, uint16_t count)
|
|
{
|
|
struct i2c_msg msgs[1];
|
|
uint8_t data[2];
|
|
int status = -EACCES;
|
|
|
|
msgs[0].addr = slave_addrs[slave_addr_index] >> 1;
|
|
msgs[0].flags = 0;
|
|
msgs[0].len = 2;
|
|
msgs[0].buf = data;
|
|
data[0] = reg_offset;
|
|
data[1] = *value;
|
|
|
|
status = i2c_transfer(mhl_msm_state->i2c_client->adapter, msgs, 1);
|
|
if (status < 1) {
|
|
pr_err("I2C WRITE FAILED=[%d]\n", status);
|
|
return -EACCES;
|
|
}
|
|
|
|
return status;
|
|
}
|
|
|
|
void mhl_i2c_reg_modify(uint8_t slave_addr_index, uint8_t reg_offset,
|
|
uint8_t mask, uint8_t val)
|
|
{
|
|
uint8_t temp;
|
|
|
|
temp = mhl_i2c_reg_read(slave_addr_index, reg_offset);
|
|
temp &= (~mask);
|
|
temp |= (mask & val);
|
|
mhl_i2c_reg_write(slave_addr_index, reg_offset, temp);
|
|
}
|
|
|