2 * Basic KB3310B Embedded Controller support for the YeeLoong 2F netbook
4 * Copyright (C) 2008 Lemote Inc.
5 * Author: liujl <liujl@lemote.com>, 2008-04-20
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
13 #include <linux/module.h>
14 #include <linux/spinlock.h>
15 #include <linux/delay.h>
17 #include "ec_kb3310b.h"
19 static DEFINE_SPINLOCK(index_access_lock);
20 static DEFINE_SPINLOCK(port_access_lock);
22 unsigned char ec_read(unsigned short addr)
27 spin_lock_irqsave(&index_access_lock, flags);
28 outb((addr & 0xff00) >> 8, EC_IO_PORT_HIGH);
29 outb((addr & 0x00ff), EC_IO_PORT_LOW);
30 value = inb(EC_IO_PORT_DATA);
31 spin_unlock_irqrestore(&index_access_lock, flags);
35 EXPORT_SYMBOL_GPL(ec_read);
37 void ec_write(unsigned short addr, unsigned char val)
41 spin_lock_irqsave(&index_access_lock, flags);
42 outb((addr & 0xff00) >> 8, EC_IO_PORT_HIGH);
43 outb((addr & 0x00ff), EC_IO_PORT_LOW);
44 outb(val, EC_IO_PORT_DATA);
45 /* flush the write action */
47 spin_unlock_irqrestore(&index_access_lock, flags);
49 EXPORT_SYMBOL_GPL(ec_write);
52 * This function is used for EC command writes and corresponding status queries.
54 int ec_query_seq(unsigned char cmd)
61 spin_lock_irqsave(&port_access_lock, flags);
63 /* make chip goto reset mode */
65 outb(cmd, EC_CMD_PORT);
68 /* check if the command is received by ec */
69 timeout = EC_CMD_TIMEOUT;
70 status = inb(EC_STS_PORT);
71 while (timeout-- && (status & (1 << 1))) {
72 status = inb(EC_STS_PORT);
76 spin_unlock_irqrestore(&port_access_lock, flags);
79 printk(KERN_ERR "%s: deadable error : timeout...\n", __func__);
83 "(%x/%d)ec issued command %d status : 0x%x\n",
84 timeout, EC_CMD_TIMEOUT - timeout, cmd, status);
88 EXPORT_SYMBOL_GPL(ec_query_seq);
91 * Send query command to EC to get the proper event number
93 int ec_query_event_num(void)
95 return ec_query_seq(CMD_GET_EVENT_NUM);
97 EXPORT_SYMBOL(ec_query_event_num);
100 * Get event number from EC
102 * NOTE: This routine must follow the query_event_num function in the
105 int ec_get_event_num(void)
109 unsigned char status;
111 udelay(EC_REG_DELAY);
112 status = inb(EC_STS_PORT);
113 udelay(EC_REG_DELAY);
114 while (timeout-- && !(status & (1 << 0))) {
115 status = inb(EC_STS_PORT);
116 udelay(EC_REG_DELAY);
119 pr_info("%s: get event number timeout.\n", __func__);
123 value = inb(EC_DAT_PORT);
124 udelay(EC_REG_DELAY);
128 EXPORT_SYMBOL(ec_get_event_num);