1/*
2 * Basic KB3310B Embedded Controller support for the YeeLoong 2F netbook
3 *
4 *  Copyright (C) 2008 Lemote Inc.
5 *  Author: liujl <liujl@lemote.com>, 2008-04-20
6 *
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.
11 */
12
13#include <linux/module.h>
14#include <linux/spinlock.h>
15#include <linux/delay.h>
16
17#include "ec_kb3310b.h"
18
19static DEFINE_SPINLOCK(index_access_lock);
20static DEFINE_SPINLOCK(port_access_lock);
21
22unsigned char ec_read(unsigned short addr)
23{
24	unsigned char value;
25	unsigned long flags;
26
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);
32
33	return value;
34}
35EXPORT_SYMBOL_GPL(ec_read);
36
37void ec_write(unsigned short addr, unsigned char val)
38{
39	unsigned long flags;
40
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 */
46	inb(EC_IO_PORT_DATA);
47	spin_unlock_irqrestore(&index_access_lock, flags);
48}
49EXPORT_SYMBOL_GPL(ec_write);
50
51/*
52 * This function is used for EC command writes and corresponding status queries.
53 */
54int ec_query_seq(unsigned char cmd)
55{
56	int timeout;
57	unsigned char status;
58	unsigned long flags;
59	int ret = 0;
60
61	spin_lock_irqsave(&port_access_lock, flags);
62
63	/* make chip goto reset mode */
64	udelay(EC_REG_DELAY);
65	outb(cmd, EC_CMD_PORT);
66	udelay(EC_REG_DELAY);
67
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);
73		udelay(EC_REG_DELAY);
74	}
75
76	spin_unlock_irqrestore(&port_access_lock, flags);
77
78	if (timeout <= 0) {
79		printk(KERN_ERR "%s: deadable error : timeout...\n", __func__);
80		ret = -EINVAL;
81	} else
82		printk(KERN_INFO
83			   "(%x/%d)ec issued command %d status : 0x%x\n",
84			   timeout, EC_CMD_TIMEOUT - timeout, cmd, status);
85
86	return ret;
87}
88EXPORT_SYMBOL_GPL(ec_query_seq);
89
90/*
91 * Send query command to EC to get the proper event number
92 */
93int ec_query_event_num(void)
94{
95	return ec_query_seq(CMD_GET_EVENT_NUM);
96}
97EXPORT_SYMBOL(ec_query_event_num);
98
99/*
100 * Get event number from EC
101 *
102 * NOTE: This routine must follow the query_event_num function in the
103 * interrupt.
104 */
105int ec_get_event_num(void)
106{
107	int timeout = 100;
108	unsigned char value;
109	unsigned char status;
110
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);
117	}
118	if (timeout <= 0) {
119		pr_info("%s: get event number timeout.\n", __func__);
120
121		return -EINVAL;
122	}
123	value = inb(EC_DAT_PORT);
124	udelay(EC_REG_DELAY);
125
126	return value;
127}
128EXPORT_SYMBOL(ec_get_event_num);
129