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