124 lines
2.8 KiB
C
124 lines
2.8 KiB
C
/*
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* bios-less APM driver for hp680
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*
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* Copyright 2005 (c) Andriy Skulysh <askulysh@gmail.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License.
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*/
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/apm_bios.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <asm/io.h>
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#include <asm/apm.h>
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#include <asm/adc.h>
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#include <asm/hp6xx/hp6xx.h>
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#define SH7709_PGDR 0xa400012c
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#define APM_CRITICAL 10
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#define APM_LOW 30
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#define HP680_BATTERY_MAX 875
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#define HP680_BATTERY_MIN 600
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#define HP680_BATTERY_AC_ON 900
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#define MODNAME "hp6x0_apm"
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static int hp6x0_apm_get_info(char *buf, char **start, off_t fpos, int length)
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{
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u8 pgdr;
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char *p;
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int battery_status;
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int battery_flag;
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int ac_line_status;
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int time_units = APM_BATTERY_LIFE_UNKNOWN;
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int battery = adc_single(ADC_CHANNEL_BATTERY);
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int backup = adc_single(ADC_CHANNEL_BACKUP);
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int charging = adc_single(ADC_CHANNEL_CHARGE);
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int percentage;
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percentage = 100 * (battery - HP680_BATTERY_MIN) /
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(HP680_BATTERY_MAX - HP680_BATTERY_MIN);
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ac_line_status = (battery > HP680_BATTERY_AC_ON) ?
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APM_AC_ONLINE : APM_AC_OFFLINE;
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p = buf;
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pgdr = ctrl_inb(SH7709_PGDR);
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if (pgdr & PGDR_MAIN_BATTERY_OUT) {
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battery_status = APM_BATTERY_STATUS_NOT_PRESENT;
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battery_flag = 0x80;
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percentage = -1;
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} else if (charging < 8 ) {
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battery_status = APM_BATTERY_STATUS_CHARGING;
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battery_flag = 0x08;
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ac_line_status = 0xff;
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} else if (percentage <= APM_CRITICAL) {
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battery_status = APM_BATTERY_STATUS_CRITICAL;
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battery_flag = 0x04;
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} else if (percentage <= APM_LOW) {
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battery_status = APM_BATTERY_STATUS_LOW;
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battery_flag = 0x02;
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} else {
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battery_status = APM_BATTERY_STATUS_HIGH;
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battery_flag = 0x01;
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}
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p += sprintf(p, "1.0 1.2 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",
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APM_32_BIT_SUPPORT,
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ac_line_status,
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battery_status,
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battery_flag,
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percentage,
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time_units,
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"min");
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p += sprintf(p, "bat=%d backup=%d charge=%d\n",
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battery, backup, charging);
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return p - buf;
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}
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static irqreturn_t hp6x0_apm_interrupt(int irq, void *dev, struct pt_regs *regs)
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{
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if (!apm_suspended)
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apm_queue_event(APM_USER_SUSPEND);
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return IRQ_HANDLED;
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}
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static int __init hp6x0_apm_init(void)
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{
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int ret;
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ret = request_irq(HP680_BTN_IRQ, hp6x0_apm_interrupt,
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SA_INTERRUPT, MODNAME, 0);
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if (unlikely(ret < 0)) {
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printk(KERN_ERR MODNAME ": IRQ %d request failed\n",
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HP680_BTN_IRQ);
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return ret;
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}
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apm_get_info = hp6x0_apm_get_info;
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return ret;
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}
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static void __exit hp6x0_apm_exit(void)
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{
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free_irq(HP680_BTN_IRQ, 0);
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apm_get_info = 0;
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}
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module_init(hp6x0_apm_init);
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module_exit(hp6x0_apm_exit);
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MODULE_AUTHOR("Adriy Skulysh");
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MODULE_DESCRIPTION("hp6xx Advanced Power Management");
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MODULE_LICENSE("GPL");
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