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/*
* HP Jornada 720 APM driver
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <asm/apm.h>
#include <asm/hardware.h>
#include <asm/arch/jornada720_mcu.h>
/*
* HP Documentation referred in this file:
* http://www.jlime.com/downloads/development/docs/jornada7xx/jornada720.txt
*/
MODULE_AUTHOR("Filip Zyzniewski <filip.zyzniewski@tefnet.pl>");
MODULE_DESCRIPTION("Jornada 720 battery status reporting");
MODULE_LICENSE("GPL");
#define jornada720_apm_battery_charging() (! (GPLR & GPIO_GPIO26) )
#define jornada720_apm_ac_online() ((GPLR & GPIO_GPIO4) ? 0 : 1)
#define JORNADA720_APM_BACKUP_BATTERY 0
#define JORNADA720_APM_MAIN_BATTERY 1
#define JORNADA720_APM_MAIN_BATT_MIN_VOLTAGE 430
/* without ac power */
#define JORNADA720_APM_MAIN_BATT_MAX_VOLTAGE 670
/* divisor to convert jornada720_apm_get_main_battery() return value into % */
#define JORNADA720_APM_MAIN_BATT_DIVISOR \
(JORNADA720_APM_MAIN_BATT_MAX_VOLTAGE-JORNADA720_APM_MAIN_BATT_MIN_VOLTAGE) * \
(JORNADA720_APM_MAIN_BATT_MAX_VOLTAGE-JORNADA720_APM_MAIN_BATT_MIN_VOLTAGE) / 100
/*
* coeffient correcting battery voltage altered by
* ac power
*/
#define JORNADA720_APM_MAIN_BATT_AC_COEFF 100 / 105
int jornada720_apm_get_battery_raw(int battnum)
{
unsigned char lsb, msb;
/* getting batteries data (line 289 of HP's doc) */
if (!jornada720_mcu_start(jornada720_mcu_GetBatteryData)) {
lsb=jornada720_mcu_read();
if (battnum==JORNADA720_APM_BACKUP_BATTERY)
/* we are interested in the second byte */
lsb=jornada720_mcu_read();
else
/* we are interested in the first byte */
jornada720_mcu_read();
msb=jornada720_mcu_read();
} else {
jornada720_mcu_end();
return -1;
}
jornada720_mcu_end();
if (battnum==JORNADA720_APM_MAIN_BATTERY) {
/*
* main battery absent
* (http://mail-index.netbsd.org/port-hpcarm/2005/09/18/0000.html)
*/
if ((msb & 0x03) == 0x03) return -1;
/* putting the value together (line 300 of HP's doc) */
return ((msb & 0x03) << 8) + lsb;
} else {
/*
* backup battery absent
* (http://mail-index.netbsd.org/port-hpcarm/2005/09/18/0000.html)
*/
if ((msb & 0x0c) == 0x00) return -1;
/* putting the value together (line 300 of HP's doc) */
return ((msb & 0x0c) << 6) + lsb;
}
}
int jornada720_apm_get_battery(int battnum)
{
int ret = jornada720_apm_get_battery_raw(battnum);
if (ret == -1)
return ret;
if (battnum==JORNADA720_APM_MAIN_BATTERY) {
/* we want 0 for a completely drained battery */
ret -= JORNADA720_APM_MAIN_BATT_MIN_VOLTAGE;
/* voltage(time) is not linear */
ret *= ret;
/* let's bring it down to 0-100% range */
ret /= JORNADA720_APM_MAIN_BATT_DIVISOR;
/* plugging AC power causes voltage to rise a bit */
if (jornada720_apm_ac_online())
ret = ret * JORNADA720_APM_MAIN_BATT_AC_COEFF;
/*
* sometimes it tends to fluctuate a bit above 100%, which
* looks funny, so we bring it down
*/
if (ret > 100) ret=100;
}
/*
* returning a raw value, because we don't know how to calculate %
* for a backup battery
*/
return ret;
}
static void jornada720_apm_get_power_status(struct apm_power_info *info)
{
info->battery_life=jornada720_apm_get_battery(JORNADA720_APM_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 (jornada720_apm_battery_charging())
info->battery_status = APM_BATTERY_STATUS_CHARGING;
info->ac_line_status = jornada720_apm_ac_online();
}
static int jornada720_apm_probe(struct device *dev) {
/* we provide a function to check battery levels etc */
apm_get_power_status=jornada720_apm_get_power_status;
return 0;
}
static int jornada720_apm_remove(struct device *dev) {
if(apm_get_power_status==jornada720_apm_get_power_status)
apm_get_power_status=NULL;
return 0;
}
static struct device_driver jornada720_apm_driver = {
.name = jornada720_mcu_bus_id_apm,
.bus = &jornada720_mcu_bus_type,
.probe = jornada720_apm_probe,
.remove = jornada720_apm_remove,
.owner = THIS_MODULE,
};
static int __init jornada720_apm_init(void) {
int ret, backup_level;
ret = driver_register(&jornada720_apm_driver);
if(ret) return ret;
backup_level = jornada720_apm_get_battery(JORNADA720_APM_BACKUP_BATTERY);
if(backup_level != -1)
printk(KERN_INFO "jornada720_apm: backup battery level: %i\n", backup_level);
else
printk(KERN_INFO "jornada720_apm: backup battery not present\n");
return ret;
}
static void __exit jornada720_apm_exit(void) {
driver_unregister(&jornada720_apm_driver);
}
module_init(jornada720_apm_init);
module_exit(jornada720_apm_exit);
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