aboutsummaryrefslogtreecommitdiffstats
path: root/arch/sh/boards/hp6xx/hp6xx_apm.c
blob: d1c1460c8a06ecf7905fe303f62ce9af03eb6f1f (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
/*
 * bios-less APM driver for hp680
 *
 * Copyright 2005 (c) Andriy Skulysh <askulysh@gmail.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License.
 */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/apm-emulation.h>
#include <linux/io.h>
#include <asm/adc.h>
#include <asm/hp6xx.h>

#define SH7709_PGDR			0xa400012c

#define APM_CRITICAL			10
#define APM_LOW				30

#define HP680_BATTERY_MAX		875
#define HP680_BATTERY_MIN		600
#define HP680_BATTERY_AC_ON		900

#define MODNAME "hp6x0_apm"

static void hp6x0_apm_get_power_status(struct apm_power_info *info)
{
	int battery, backup, charging, percentage;
	u8 pgdr;

	battery		= adc_single(ADC_CHANNEL_BATTERY);
	backup		= adc_single(ADC_CHANNEL_BACKUP);
	charging	= adc_single(ADC_CHANNEL_CHARGE);

	percentage = 100 * (battery - HP680_BATTERY_MIN) /
			   (HP680_BATTERY_MAX - HP680_BATTERY_MIN);

	info->ac_line_status = (battery > HP680_BATTERY_AC_ON) ?
			 APM_AC_ONLINE : APM_AC_OFFLINE;

	pgdr = ctrl_inb(SH7709_PGDR);
	if (pgdr & PGDR_MAIN_BATTERY_OUT) {
		info->battery_status	= APM_BATTERY_STATUS_NOT_PRESENT;
		info->battery_flag	= 0x80;
	} else if (charging < 8) {
		info->battery_status	= APM_BATTERY_STATUS_CHARGING;
		info->battery_flag	= 0x08;
		info->ac_line_status = 0xff;
	} else if (percentage <= APM_CRITICAL) {
		info->battery_status	= APM_BATTERY_STATUS_CRITICAL;
		info->battery_flag	= 0x04;
	} else if (percentage <= APM_LOW) {
		info->battery_status	= APM_BATTERY_STATUS_LOW;
		info->battery_flag	= 0x02;
	} else {
		info->battery_status	= APM_BATTERY_STATUS_HIGH;
		info->battery_flag	= 0x01;
	}

	info->units = 0;
}

static irqreturn_t hp6x0_apm_interrupt(int irq, void *dev)
{
	if (!apm_suspended)
		apm_queue_event(APM_USER_SUSPEND);

	return IRQ_HANDLED;
}

static int __init hp6x0_apm_init(void)
{
	int ret;

	ret = request_irq(HP680_BTN_IRQ, hp6x0_apm_interrupt,
			  IRQF_DISABLED, MODNAME, NULL);
	if (unlikely(ret < 0)) {
		printk(KERN_ERR MODNAME ": IRQ %d request failed\n",
		       HP680_BTN_IRQ);
		return ret;
	}

	apm_get_power_status = hp6x0_apm_get_power_status;

	return ret;
}

static void __exit hp6x0_apm_exit(void)
{
	free_irq(HP680_BTN_IRQ, 0);
	apm_get_info = NULL;
}

module_init(hp6x0_apm_init);
module_exit(hp6x0_apm_exit);

MODULE_AUTHOR("Adriy Skulysh");
MODULE_DESCRIPTION("hp6xx Advanced Power Management");
MODULE_LICENSE("GPL");