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/*
* 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/apm_bios.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <asm/io.h>
#include <asm/apm.h>
#include <asm/adc.h>
#include <asm/hp6xx/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 int hp6x0_apm_get_info(char *buf, char **start, off_t fpos, int length)
{
u8 pgdr;
char *p;
int battery_status;
int battery_flag;
int ac_line_status;
int time_units = APM_BATTERY_LIFE_UNKNOWN;
int battery = adc_single(ADC_CHANNEL_BATTERY);
int backup = adc_single(ADC_CHANNEL_BACKUP);
int charging = adc_single(ADC_CHANNEL_CHARGE);
int percentage;
percentage = 100 * (battery - HP680_BATTERY_MIN) /
(HP680_BATTERY_MAX - HP680_BATTERY_MIN);
ac_line_status = (battery > HP680_BATTERY_AC_ON) ?
APM_AC_ONLINE : APM_AC_OFFLINE;
p = buf;
pgdr = ctrl_inb(SH7709_PGDR);
if (pgdr & PGDR_MAIN_BATTERY_OUT) {
battery_status = APM_BATTERY_STATUS_NOT_PRESENT;
battery_flag = 0x80;
percentage = -1;
} else if (charging < 8 ) {
battery_status = APM_BATTERY_STATUS_CHARGING;
battery_flag = 0x08;
ac_line_status = 0xff;
} else if (percentage <= APM_CRITICAL) {
battery_status = APM_BATTERY_STATUS_CRITICAL;
battery_flag = 0x04;
} else if (percentage <= APM_LOW) {
battery_status = APM_BATTERY_STATUS_LOW;
battery_flag = 0x02;
} else {
battery_status = APM_BATTERY_STATUS_HIGH;
battery_flag = 0x01;
}
p += sprintf(p, "1.0 1.2 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",
APM_32_BIT_SUPPORT,
ac_line_status,
battery_status,
battery_flag,
percentage,
time_units,
"min");
p += sprintf(p, "bat=%d backup=%d charge=%d\n",
battery, backup, charging);
return p - buf;
}
static irqreturn_t hp6x0_apm_interrupt(int irq, void *dev, struct pt_regs *regs)
{
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,
SA_INTERRUPT, MODNAME, 0);
if (unlikely(ret < 0)) {
printk(KERN_ERR MODNAME ": IRQ %d request failed\n",
HP680_BTN_IRQ);
return ret;
}
apm_get_info = hp6x0_apm_get_info;
return ret;
}
static void __exit hp6x0_apm_exit(void)
{
free_irq(HP680_BTN_IRQ, 0);
apm_get_info = 0;
}
module_init(hp6x0_apm_init);
module_exit(hp6x0_apm_exit);
MODULE_AUTHOR("Adriy Skulysh");
MODULE_DESCRIPTION("hp6xx Advanced Power Management");
MODULE_LICENSE("GPL");
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