2874c5fd28
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
126 lines
2.8 KiB
C
126 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Basic KB3310B Embedded Controller support for the YeeLoong 2F netbook
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*
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* Copyright (C) 2008 Lemote Inc.
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* Author: liujl <liujl@lemote.com>, 2008-04-20
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*/
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#include <linux/io.h>
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#include <linux/export.h>
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#include <linux/spinlock.h>
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#include <linux/delay.h>
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#include "ec_kb3310b.h"
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static DEFINE_SPINLOCK(index_access_lock);
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static DEFINE_SPINLOCK(port_access_lock);
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unsigned char ec_read(unsigned short addr)
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{
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unsigned char value;
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unsigned long flags;
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spin_lock_irqsave(&index_access_lock, flags);
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outb((addr & 0xff00) >> 8, EC_IO_PORT_HIGH);
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outb((addr & 0x00ff), EC_IO_PORT_LOW);
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value = inb(EC_IO_PORT_DATA);
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spin_unlock_irqrestore(&index_access_lock, flags);
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return value;
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}
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EXPORT_SYMBOL_GPL(ec_read);
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void ec_write(unsigned short addr, unsigned char val)
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{
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unsigned long flags;
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spin_lock_irqsave(&index_access_lock, flags);
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outb((addr & 0xff00) >> 8, EC_IO_PORT_HIGH);
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outb((addr & 0x00ff), EC_IO_PORT_LOW);
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outb(val, EC_IO_PORT_DATA);
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/* flush the write action */
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inb(EC_IO_PORT_DATA);
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spin_unlock_irqrestore(&index_access_lock, flags);
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}
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EXPORT_SYMBOL_GPL(ec_write);
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/*
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* This function is used for EC command writes and corresponding status queries.
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*/
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int ec_query_seq(unsigned char cmd)
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{
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int timeout;
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unsigned char status;
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unsigned long flags;
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int ret = 0;
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spin_lock_irqsave(&port_access_lock, flags);
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/* make chip goto reset mode */
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udelay(EC_REG_DELAY);
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outb(cmd, EC_CMD_PORT);
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udelay(EC_REG_DELAY);
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/* check if the command is received by ec */
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timeout = EC_CMD_TIMEOUT;
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status = inb(EC_STS_PORT);
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while (timeout-- && (status & (1 << 1))) {
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status = inb(EC_STS_PORT);
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udelay(EC_REG_DELAY);
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}
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spin_unlock_irqrestore(&port_access_lock, flags);
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if (timeout <= 0) {
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printk(KERN_ERR "%s: deadable error : timeout...\n", __func__);
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ret = -EINVAL;
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} else
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printk(KERN_INFO
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"(%x/%d)ec issued command %d status : 0x%x\n",
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timeout, EC_CMD_TIMEOUT - timeout, cmd, status);
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return ret;
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}
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EXPORT_SYMBOL_GPL(ec_query_seq);
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/*
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* Send query command to EC to get the proper event number
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*/
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int ec_query_event_num(void)
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{
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return ec_query_seq(CMD_GET_EVENT_NUM);
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}
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EXPORT_SYMBOL(ec_query_event_num);
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/*
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* Get event number from EC
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*
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* NOTE: This routine must follow the query_event_num function in the
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* interrupt.
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*/
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int ec_get_event_num(void)
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{
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int timeout = 100;
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unsigned char value;
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unsigned char status;
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udelay(EC_REG_DELAY);
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status = inb(EC_STS_PORT);
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udelay(EC_REG_DELAY);
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while (timeout-- && !(status & (1 << 0))) {
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status = inb(EC_STS_PORT);
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udelay(EC_REG_DELAY);
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}
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if (timeout <= 0) {
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pr_info("%s: get event number timeout.\n", __func__);
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return -EINVAL;
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}
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value = inb(EC_DAT_PORT);
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udelay(EC_REG_DELAY);
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return value;
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}
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EXPORT_SYMBOL(ec_get_event_num);
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