/*
|
* Basic KB3310B Embedded Controller support for the YeeLoong 2F netbook
|
*
|
* Copyright (C) 2008 Lemote Inc.
|
* Author: liujl <liujl@lemote.com>, 2008-04-20
|
*
|
* 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.
|
*/
|
|
#include <linux/io.h>
|
#include <linux/export.h>
|
#include <linux/spinlock.h>
|
#include <linux/delay.h>
|
|
#include "ec_kb3310b.h"
|
|
static DEFINE_SPINLOCK(index_access_lock);
|
static DEFINE_SPINLOCK(port_access_lock);
|
|
unsigned char ec_read(unsigned short addr)
|
{
|
unsigned char value;
|
unsigned long flags;
|
|
spin_lock_irqsave(&index_access_lock, flags);
|
outb((addr & 0xff00) >> 8, EC_IO_PORT_HIGH);
|
outb((addr & 0x00ff), EC_IO_PORT_LOW);
|
value = inb(EC_IO_PORT_DATA);
|
spin_unlock_irqrestore(&index_access_lock, flags);
|
|
return value;
|
}
|
EXPORT_SYMBOL_GPL(ec_read);
|
|
void ec_write(unsigned short addr, unsigned char val)
|
{
|
unsigned long flags;
|
|
spin_lock_irqsave(&index_access_lock, flags);
|
outb((addr & 0xff00) >> 8, EC_IO_PORT_HIGH);
|
outb((addr & 0x00ff), EC_IO_PORT_LOW);
|
outb(val, EC_IO_PORT_DATA);
|
/* flush the write action */
|
inb(EC_IO_PORT_DATA);
|
spin_unlock_irqrestore(&index_access_lock, flags);
|
}
|
EXPORT_SYMBOL_GPL(ec_write);
|
|
/*
|
* This function is used for EC command writes and corresponding status queries.
|
*/
|
int ec_query_seq(unsigned char cmd)
|
{
|
int timeout;
|
unsigned char status;
|
unsigned long flags;
|
int ret = 0;
|
|
spin_lock_irqsave(&port_access_lock, flags);
|
|
/* make chip goto reset mode */
|
udelay(EC_REG_DELAY);
|
outb(cmd, EC_CMD_PORT);
|
udelay(EC_REG_DELAY);
|
|
/* check if the command is received by ec */
|
timeout = EC_CMD_TIMEOUT;
|
status = inb(EC_STS_PORT);
|
while (timeout-- && (status & (1 << 1))) {
|
status = inb(EC_STS_PORT);
|
udelay(EC_REG_DELAY);
|
}
|
|
spin_unlock_irqrestore(&port_access_lock, flags);
|
|
if (timeout <= 0) {
|
printk(KERN_ERR "%s: deadable error : timeout...\n", __func__);
|
ret = -EINVAL;
|
} else
|
printk(KERN_INFO
|
"(%x/%d)ec issued command %d status : 0x%x\n",
|
timeout, EC_CMD_TIMEOUT - timeout, cmd, status);
|
|
return ret;
|
}
|
EXPORT_SYMBOL_GPL(ec_query_seq);
|
|
/*
|
* Send query command to EC to get the proper event number
|
*/
|
int ec_query_event_num(void)
|
{
|
return ec_query_seq(CMD_GET_EVENT_NUM);
|
}
|
EXPORT_SYMBOL(ec_query_event_num);
|
|
/*
|
* Get event number from EC
|
*
|
* NOTE: This routine must follow the query_event_num function in the
|
* interrupt.
|
*/
|
int ec_get_event_num(void)
|
{
|
int timeout = 100;
|
unsigned char value;
|
unsigned char status;
|
|
udelay(EC_REG_DELAY);
|
status = inb(EC_STS_PORT);
|
udelay(EC_REG_DELAY);
|
while (timeout-- && !(status & (1 << 0))) {
|
status = inb(EC_STS_PORT);
|
udelay(EC_REG_DELAY);
|
}
|
if (timeout <= 0) {
|
pr_info("%s: get event number timeout.\n", __func__);
|
|
return -EINVAL;
|
}
|
value = inb(EC_DAT_PORT);
|
udelay(EC_REG_DELAY);
|
|
return value;
|
}
|
EXPORT_SYMBOL(ec_get_event_num);
|
