/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* h3xxx atmel micro companion support, battery subdevice
* based on previous kernel 2.4 version
* Author : Alessandro Gardich <gremlin@gremlin.it>
* Author : Linus Walleij <linus.walleij@linaro.org>
*
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/mfd/ipaq-micro.h>
#include <linux/power_supply.h>
#include <linux/workqueue.h>
#define BATT_PERIOD 100000 /* 100 seconds in milliseconds */
#define MICRO_BATT_CHEM_ALKALINE 0x01
#define MICRO_BATT_CHEM_NICD 0x02
#define MICRO_BATT_CHEM_NIMH 0x03
#define MICRO_BATT_CHEM_LION 0x04
#define MICRO_BATT_CHEM_LIPOLY 0x05
#define MICRO_BATT_CHEM_NOT_INSTALLED 0x06
#define MICRO_BATT_CHEM_UNKNOWN 0xff
#define MICRO_BATT_STATUS_HIGH 0x01
#define MICRO_BATT_STATUS_LOW 0x02
#define MICRO_BATT_STATUS_CRITICAL 0x04
#define MICRO_BATT_STATUS_CHARGING 0x08
#define MICRO_BATT_STATUS_CHARGEMAIN 0x10
#define MICRO_BATT_STATUS_DEAD 0x20 /* Battery will not charge */
#define MICRO_BATT_STATUS_NOTINSTALLED 0x20 /* For expansion pack batteries */
#define MICRO_BATT_STATUS_FULL 0x40 /* Battery fully charged */
#define MICRO_BATT_STATUS_NOBATTERY 0x80
#define MICRO_BATT_STATUS_UNKNOWN 0xff
struct micro_battery {
struct ipaq_micro *micro;
struct workqueue_struct *wq;
struct delayed_work update;
u8 ac;
u8 chemistry;
unsigned int voltage;
u16 temperature;
u8 flag;
};
static void micro_battery_work(struct work_struct *work)
{
struct micro_battery *mb = container_of(work,
struct micro_battery, update.work);
struct ipaq_micro_msg msg_battery = {
.id = MSG_BATTERY,
};
struct ipaq_micro_msg msg_sensor = {
.id = MSG_THERMAL_SENSOR,
};
/* First send battery message */
ipaq_micro_tx_msg_sync(mb->micro, &msg_battery);
if (msg_battery.rx_len < 4)
pr_info("ERROR");
/*
* Returned message format:
* byte 0: 0x00 = Not plugged in
* 0x01 = AC adapter plugged in
* byte 1: chemistry
* byte 2: voltage LSB
* byte 3: voltage MSB
* byte 4: flags
* byte 5-9: same for battery 2
*/
mb->ac = msg_battery.rx_data[0];
mb->chemistry = msg_battery.rx_data[1];
mb->voltage = ((((unsigned short)msg_battery.rx_data[3] << 8) +
msg_battery.rx_data[2]) * 5000L) * 1000 / 1024;
mb->flag = msg_battery.rx_data[4];
if (msg_battery.rx_len == 9)
pr_debug("second battery ignored\n");
/* Then read the sensor */
ipaq_micro_tx_msg_sync(mb->micro, &msg_sensor);
mb->temperature = msg_sensor.rx_data[1] << 8 | msg_sensor.rx_data[0];
queue_delayed_work(mb->wq, &mb->update, msecs_to_jiffies(BATT_PERIOD));
}
static int get_capacity(struct power_supply *b)
{
struct micro_battery *mb = dev_get_drvdata(b->dev.parent);
switch (mb->flag & 0x07) {
case MICRO_BATT_STATUS_HIGH:
return 100;
break;
case MICRO_BATT_STATUS_LOW:
return 50;
break;
case MICRO_BATT_STATUS_CRITICAL:
return 5;
break;
default:
break;
}
return 0;
}
static int get_status(struct power_supply *b)
{
struct micro_battery *mb = dev_get_drvdata(b->dev.parent);
if (mb->flag == MICRO_BATT_STATUS_UNKNOWN)
return POWER_SUPPLY_STATUS_UNKNOWN;
if (mb->flag & MICRO_BATT_STATUS_FULL)
return POWER_SUPPLY_STATUS_FULL;
if ((mb->flag & MICRO_BATT_STATUS_CHARGING) ||
(mb->flag & MICRO_BATT_STATUS_CHARGEMAIN))
return POWER_SUPPLY_STATUS_CHARGING;
return POWER_SUPPLY_STATUS_DISCHARGING;
}
static int micro_batt_get_property(struct power_supply *b,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct micro_battery *mb = dev_get_drvdata(b->dev.parent);
switch (psp) {
case POWER_SUPPLY_PROP_TECHNOLOGY:
switch (mb->chemistry) {
case MICRO_BATT_CHEM_NICD:
val->intval = POWER_SUPPLY_TECHNOLOGY_NiCd;
break;
case MICRO_BATT_CHEM_NIMH:
val->intval = POWER_SUPPLY_TECHNOLOGY_NiMH;
break;
case MICRO_BATT_CHEM_LION:
val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
break;
case MICRO_BATT_CHEM_LIPOLY:
val->intval = POWER_SUPPLY_TECHNOLOGY_LIPO;
break;
default:
val->intval = POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
break;
};
break;
case POWER_SUPPLY_PROP_STATUS:
val->intval = get_status(b);
break;
case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
val->intval = 4700000;
break;
case POWER_SUPPLY_PROP_CAPACITY:
val->intval = get_capacity(b);
break;
case POWER_SUPPLY_PROP_TEMP:
val->intval = mb->temperature;
break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
val->intval = mb->voltage;
break;
default:
return -EINVAL;
};
return 0;
}
static int micro_ac_get_property(struct power_supply *b,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct micro_battery *mb = dev_get_drvdata(b->dev.parent);
switch (psp) {
case POWER_SUPPLY_PROP_ONLINE:
val->intval = mb->ac;
break;
default:
return -EINVAL;
};
return 0;
}
static enum power_supply_property micro_batt_power_props[] = {
POWER_SUPPLY_PROP_TECHNOLOGY,
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
POWER_SUPPLY_PROP_CAPACITY,
POWER_SUPPLY_PROP_TEMP,
POWER_SUPPLY_PROP_VOLTAGE_NOW,
};
static const struct power_supply_desc micro_batt_power_desc = {
.name = "main-battery",
.type = POWER_SUPPLY_TYPE_BATTERY,
.properties = micro_batt_power_props,
.num_properties = ARRAY_SIZE(micro_batt_power_props),
.get_property = micro_batt_get_property,
.use_for_apm = 1,
};
static enum power_supply_property micro_ac_power_props[] = {
POWER_SUPPLY_PROP_ONLINE,
};
static const struct power_supply_desc micro_ac_power_desc = {
.name = "ac",
.type = POWER_SUPPLY_TYPE_MAINS,
.properties = micro_ac_power_props,
.num_properties = ARRAY_SIZE(micro_ac_power_props),
.get_property = micro_ac_get_property,
};
static struct power_supply *micro_batt_power, *micro_ac_power;
static int micro_batt_probe(struct platform_device *pdev)
{
struct micro_battery *mb;
int ret;
mb = devm_kzalloc(&pdev->dev, sizeof(*mb), GFP_KERNEL);
if (!mb)
return -ENOMEM;
mb->micro = dev_get_drvdata(pdev->dev.parent);
mb->wq = alloc_workqueue("ipaq-battery-wq", WQ_MEM_RECLAIM, 0);
if (!mb->wq)
return -ENOMEM;
INIT_DELAYED_WORK(&mb->update, micro_battery_work);
platform_set_drvdata(pdev, mb);
queue_delayed_work(mb->wq, &mb->update, 1);
micro_batt_power = power_supply_register(&pdev->dev,
µ_batt_power_desc, NULL);
if (IS_ERR(micro_batt_power)) {
ret = PTR_ERR(micro_batt_power);
goto batt_err;
}
micro_ac_power = power_supply_register(&pdev->dev,
µ_ac_power_desc, NULL);
if (IS_ERR(micro_ac_power)) {
ret = PTR_ERR(micro_ac_power);
goto ac_err;
}
dev_info(&pdev->dev, "iPAQ micro battery driver\n");
return 0;
ac_err:
power_supply_unregister(micro_batt_power);
batt_err:
cancel_delayed_work_sync(&mb->update);
destroy_workqueue(mb->wq);
return ret;
}
static int micro_batt_remove(struct platform_device *pdev)
{
struct micro_battery *mb = platform_get_drvdata(pdev);
power_supply_unregister(micro_ac_power);
power_supply_unregister(micro_batt_power);
cancel_delayed_work_sync(&mb->update);
destroy_workqueue(mb->wq);
return 0;
}
static int __maybe_unused micro_batt_suspend(struct device *dev)
{
struct micro_battery *mb = dev_get_drvdata(dev);
cancel_delayed_work_sync(&mb->update);
return 0;
}
static int __maybe_unused micro_batt_resume(struct device *dev)
{
struct micro_battery *mb = dev_get_drvdata(dev);
queue_delayed_work(mb->wq, &mb->update, msecs_to_jiffies(BATT_PERIOD));
return 0;
}
static const struct dev_pm_ops micro_batt_dev_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(micro_batt_suspend, micro_batt_resume)
};
static struct platform_driver micro_batt_device_driver = {
.driver = {
.name = "ipaq-micro-battery",
.pm = µ_batt_dev_pm_ops,
},
.probe = micro_batt_probe,
.remove = micro_batt_remove,
};
module_platform_driver(micro_batt_device_driver);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("driver for iPAQ Atmel micro battery");
MODULE_ALIAS("platform:ipaq-micro-battery");
