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/*
* arch/arm/mach-sa1100/jornada720_apm.c
*
* HP Jornada 710/720/728 battery detection (apm) platform driver
*
* Copyright (C) 2007,2008 Kristoffer Ericson <Kristoffer.Ericson@gmail.com>
* Copyright (C) 2006 Filip Zyzniewski <filip.zyzniewski@tefnet.pl>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 (or later) as
* published by the Free Software Foundation.
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/apm-emulation.h>
#include <asm/hardware.h>
#include <asm/arch/jornada720.h>
MODULE_AUTHOR("Filip Zyzniewski <filip.zyzniewski@tefnet.pl>, Kristoffer Ericson <kristoffer.ericson@gmail.com>");
MODULE_DESCRIPTION("HP Jornada 710/720/728 battery status reporting");
MODULE_LICENSE("GPL");
/**
* voltage && detection
*/
#define max_voltage 670 /* max voltage without ac power */
#define min_voltage 430 /* min voltage */
#define ac_connected() ((GPLR & GPIO_GPIO4) ? 0 : 1) /* is ac connected? */
#define ac_charging() (! (GPLR & GPIO_GPIO26) ) /* are we charging? */
/**
* battery calculations
*/
#define main_diff (max_voltage - min_voltage) /* just to keep defines small */
#define main_ac_coeff 100 / 105 /* correcting battery values when with ac */
#define main_divisor (main_diff * main_diff) / 100 /* battery power to percent */
#define main_lin_corr (main_diff * main_diff) / 2 /* adjusting for non-linearity */
int jornada720_apm_get_battery_raw(int battnum)
{
unsigned char low_byte, high_byte, msb;
jornada_ssp_start();
/* if ssp connection fails we bail out */
if(jornada_ssp_inout(GETBATTERYDATA) < 0) {
printk(KERN_WARNING "APM: Failed trying to aquire battery data \n");
jornada_ssp_end();
return -1;
}
low_byte = jornada_ssp_inout(TXDUMMY); /* backup battery value */
high_byte = jornada_ssp_inout(TXDUMMY); /* main battery value */
msb = jornada_ssp_inout(TXDUMMY); /* status */
jornada_ssp_end();
/* main battery */
if (battnum) {
if ((msb & 0x03) == 0x03) return -1; /* main battery absent */
return ((msb & 0x03) << 8) + low_byte; /* wrapping values */
}
/* backup battery */
else {
if ((msb & 0x0c) == 0x00) return -1; /* backup battery abset */
return ((msb & 0x0c) << 6) + high_byte; /* wrapping values */
}
}
int jornada720_apm_get_battery(int battnum)
{
int ret = jornada720_apm_get_battery_raw(battnum);
if (ret == -1)
return ret;
/* main battery only, cannot calculate backup battery */
if (battnum) {
ret -= min_voltage; /* we want 0 for fully drained battery */
/* trying to get values more linear */
ret *= ret;
if (ret > 37000)
ret = ret * 3/2 - main_lin_corr;
else
ret = ret * 7/10;
ret /= main_divisor; /* 0-100% range */
if (ac_connected()) /* adjusting for ac fluctuations */
ret = ret * main_ac_coeff;
if (ret > 100)
ret = 100; /* should never report above 100% */
}
return ret;
}
static void jornada720_apm_get_power_status(struct apm_power_info *info)
{
info->battery_life = jornada720_apm_get_battery(1); /* main battery */
if (info->battery_life == -1) {
info->battery_status = APM_BATTERY_STATUS_NOT_PRESENT;
info->battery_flag = APM_BATTERY_FLAG_NOT_PRESENT;
} else if (info->battery_life < 30) {
info->battery_status = APM_BATTERY_STATUS_LOW;
info->battery_flag = APM_BATTERY_FLAG_LOW;
} else if (info->battery_life < 5) {
info->battery_status = APM_BATTERY_STATUS_CRITICAL;
info->battery_flag = APM_BATTERY_FLAG_CRITICAL;
} else {
info->battery_status = APM_BATTERY_STATUS_HIGH;
info->battery_flag = APM_BATTERY_FLAG_HIGH;
}
if (ac_charging())
info->battery_status = APM_BATTERY_STATUS_CHARGING;
info->ac_line_status = ac_connected();
}
static int __devinit jornada720_apm_probe(struct platform_device *pdev)
{
printk(KERN_INFO "jornada720_apm: Initializing\n");
apm_get_power_status = jornada720_apm_get_power_status;
return 0;
}
static int __devexit jornada720_apm_remove(struct platform_device *pdev)
{
if (apm_get_power_status == jornada720_apm_get_power_status)
apm_get_power_status=NULL;
return 0;
}
static struct platform_driver jornada720_apm_driver = {
.driver = {
.name = "jornada_apm",
},
.probe = jornada720_apm_probe,
.remove = __devexit_p(jornada720_apm_remove),
};
static int __init jornada720_apm_init(void)
{
return platform_driver_register(&jornada720_apm_driver);
}
static void __exit jornada720_apm_exit(void) {
platform_driver_unregister(&jornada720_apm_driver);
}
module_init(jornada720_apm_init);
module_exit(jornada720_apm_exit);
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