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Fixed MTP to work with TWRP

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awab228 2018-06-19 23:16:04 +02:00
commit f6dfaef42e
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118
drivers/muic/universal/muic_i2c.c Normal file
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/*
* muic_i2c.c - SM5703 micro USB switch device driver
*
* Copyright (C) 2014 Samsung Electronics
* Thomas Ryu <smilesr.ryu@samsung.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <linux/gpio.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/host_notify.h>
#include <linux/muic/muic.h>
#if defined(CONFIG_MUIC_NOTIFIER)
#include <linux/muic/muic_notifier.h>
#endif /* CONFIG_MUIC_NOTIFIER */
#if defined (CONFIG_OF)
#include <linux/of_device.h>
#include <linux/of_gpio.h>
#endif /* CONFIG_OF */
#include "muic-internal.h"
#include "muic_debug.h"
int muic_i2c_read_byte(const struct i2c_client *client, u8 command)
{
int ret;
int retry = 0;
ret = i2c_smbus_read_byte_data(client, command);
while(ret < 0){
pr_err("%s:i2c err on reading reg(0x%x), retrying ...\n",
__func__, command);
if(retry > 10)
{
pr_err("%s: retry count > 10 : failed !!\n", __func__);
break;
}
msleep(100);
ret = i2c_smbus_read_byte_data(client, command);
retry ++;
}
#ifdef DEBUG_MUIC
muic_reg_log(command, ret, retry << 1| READ);
#endif
return ret;
}
int muic_i2c_write_byte(const struct i2c_client *client,
u8 command, u8 value)
{
int ret;
int retry = 0;
int written = 0;
ret = i2c_smbus_write_byte_data(client, command, value);
while(ret < 0) {
written = i2c_smbus_read_byte_data(client, command);
if(written < 0) pr_err("%s:i2c err on reading reg(0x%x)\n",
__func__, command);
msleep(100);
ret = i2c_smbus_write_byte_data(client, command, value);
retry ++;
}
#ifdef DEBUG_MUIC
muic_reg_log(command, value, retry << 1| WRITE);
#endif
return ret;
}
int muic_i2c_guaranteed_wbyte(const struct i2c_client *client,
u8 command, u8 value)
{
int ret;
int retry = 0;
int written;
ret = muic_i2c_write_byte(client, command, value);
written = muic_i2c_read_byte(client, command);
while(written != value){
pr_err("%s:reg(0x%x): written(0x%x) != value(0x%x)...\n",
__func__, command, written, value);
if(retry > 10)
{
pr_err("%s: retry count > 10 : failed !!\n", __func__);
break;
}
msleep(100);
retry ++;
ret = muic_i2c_write_byte(client, command, value);
written = muic_i2c_read_byte(client, command);
}
return ret;
}