1/*
2 * bios-less APM driver for hp680
3 *
4 * Copyright 2005 (c) Andriy Skulysh <askulysh@gmail.com>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License.
8 */
9#include <linux/module.h>
10#include <linux/kernel.h>
11#include <linux/init.h>
12#include <linux/interrupt.h>
13#include <linux/apm-emulation.h>
14#include <linux/io.h>
15#include <asm/adc.h>
16#include <asm/hp6xx.h>
17
18#define SH7709_PGDR			0xa400012c
19
20#define APM_CRITICAL			10
21#define APM_LOW				30
22
23#define HP680_BATTERY_MAX		875
24#define HP680_BATTERY_MIN		600
25#define HP680_BATTERY_AC_ON		900
26
27#define MODNAME "hp6x0_apm"
28
29static void hp6x0_apm_get_power_status(struct apm_power_info *info)
30{
31	int battery, backup, charging, percentage;
32	u8 pgdr;
33
34	battery		= adc_single(ADC_CHANNEL_BATTERY);
35	backup		= adc_single(ADC_CHANNEL_BACKUP);
36	charging	= adc_single(ADC_CHANNEL_CHARGE);
37
38	percentage = 100 * (battery - HP680_BATTERY_MIN) /
39			   (HP680_BATTERY_MAX - HP680_BATTERY_MIN);
40
41	info->ac_line_status = (battery > HP680_BATTERY_AC_ON) ?
42			 APM_AC_ONLINE : APM_AC_OFFLINE;
43
44	pgdr = ctrl_inb(SH7709_PGDR);
45	if (pgdr & PGDR_MAIN_BATTERY_OUT) {
46		info->battery_status	= APM_BATTERY_STATUS_NOT_PRESENT;
47		info->battery_flag	= 0x80;
48	} else if (charging < 8) {
49		info->battery_status	= APM_BATTERY_STATUS_CHARGING;
50		info->battery_flag	= 0x08;
51		info->ac_line_status = 0xff;
52	} else if (percentage <= APM_CRITICAL) {
53		info->battery_status	= APM_BATTERY_STATUS_CRITICAL;
54		info->battery_flag	= 0x04;
55	} else if (percentage <= APM_LOW) {
56		info->battery_status	= APM_BATTERY_STATUS_LOW;
57		info->battery_flag	= 0x02;
58	} else {
59		info->battery_status	= APM_BATTERY_STATUS_HIGH;
60		info->battery_flag	= 0x01;
61	}
62
63	info->units = 0;
64}
65
66static irqreturn_t hp6x0_apm_interrupt(int irq, void *dev)
67{
68	if (!apm_suspended)
69		apm_queue_event(APM_USER_SUSPEND);
70
71	return IRQ_HANDLED;
72}
73
74static int __init hp6x0_apm_init(void)
75{
76	int ret;
77
78	ret = request_irq(HP680_BTN_IRQ, hp6x0_apm_interrupt,
79			  IRQF_DISABLED, MODNAME, NULL);
80	if (unlikely(ret < 0)) {
81		printk(KERN_ERR MODNAME ": IRQ %d request failed\n",
82		       HP680_BTN_IRQ);
83		return ret;
84	}
85
86	apm_get_power_status = hp6x0_apm_get_power_status;
87
88	return ret;
89}
90
91static void __exit hp6x0_apm_exit(void)
92{
93	free_irq(HP680_BTN_IRQ, 0);
94	apm_get_info = NULL;
95}
96
97module_init(hp6x0_apm_init);
98module_exit(hp6x0_apm_exit);
99
100MODULE_AUTHOR("Adriy Skulysh");
101MODULE_DESCRIPTION("hp6xx Advanced Power Management");
102MODULE_LICENSE("GPL");
103