/*
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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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* Copyright 2008 (c) Kristoffer Ericson <kristoffer.ericson@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/module.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 <linux/apm-emulation.h>
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#include <linux/io.h>
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#include <asm/adc.h>
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#include <mach/hp6xx.h>
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/* percentage values */
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#define APM_CRITICAL 10
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#define APM_LOW 30
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/* resonably sane values */
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#define HP680_BATTERY_MAX 898
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#define HP680_BATTERY_MIN 486
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#define HP680_BATTERY_AC_ON 1023
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#define MODNAME "hp6x0_apm"
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#define PGDR 0xa400012c
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static void hp6x0_apm_get_power_status(struct apm_power_info *info)
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{
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int battery, backup, charging, percentage;
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u8 pgdr;
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battery = adc_single(ADC_CHANNEL_BATTERY);
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backup = adc_single(ADC_CHANNEL_BACKUP);
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charging = adc_single(ADC_CHANNEL_CHARGE);
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percentage = 100 * (battery - HP680_BATTERY_MIN) /
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(HP680_BATTERY_MAX - HP680_BATTERY_MIN);
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/* % of full battery */
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info->battery_life = percentage;
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/* We want our estimates in minutes */
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info->units = 0;
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/* Extremely(!!) rough estimate, we will replace this with a datalist later on */
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info->time = (2 * battery);
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info->ac_line_status = (battery > HP680_BATTERY_AC_ON) ?
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APM_AC_ONLINE : APM_AC_OFFLINE;
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pgdr = __raw_readb(PGDR);
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if (pgdr & PGDR_MAIN_BATTERY_OUT) {
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info->battery_status = APM_BATTERY_STATUS_NOT_PRESENT;
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info->battery_flag = 0x80;
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} else if (charging < 8) {
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info->battery_status = APM_BATTERY_STATUS_CHARGING;
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info->battery_flag = 0x08;
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info->ac_line_status = 0x01;
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} else if (percentage <= APM_CRITICAL) {
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info->battery_status = APM_BATTERY_STATUS_CRITICAL;
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info->battery_flag = 0x04;
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} else if (percentage <= APM_LOW) {
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info->battery_status = APM_BATTERY_STATUS_LOW;
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info->battery_flag = 0x02;
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} else {
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info->battery_status = APM_BATTERY_STATUS_HIGH;
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info->battery_flag = 0x01;
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}
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}
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static irqreturn_t hp6x0_apm_interrupt(int irq, void *dev)
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{
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if (!APM_DISABLED)
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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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0, MODNAME, NULL);
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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_power_status = hp6x0_apm_get_power_status;
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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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}
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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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