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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/sh/boards/mach-hp6xx/hp6xx_apm.c
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/*

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 * bios-less APM driver for hp680

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 *

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 * Copyright 2005 (c) Andriy Skulysh <[email protected]>

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 * Copyright 2008 (c) Kristoffer Ericson <[email protected]>

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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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			  IRQF_DISABLED, 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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