Commit 00a588f9 authored by Dmitry Artamonow's avatar Dmitry Artamonow Committed by Sebastian Reichel
Browse files

power: add driver for battery reading on iPaq h3xxx 



This adds a driver for reading the battery status of the
battery connected to the Atmel microcontroller on the
iPAQ h3xxx series.

Based on a driver from handhelds.org 2.6.21 kernel, written
by Alessandro GARDICH.

Signed-off-by: default avatarDmitry Artamonow <mad_soft@inbox.ru>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: default avatarSebastian Reichel <sre@kernel.org>
parent 61a7784e

drivers/power/Kconfig

+7 −0
Original line number Diff line number Diff line
@@ -137,6 +137,13 @@ config BATTERY_COLLIE 
	  Say Y to enable support for the battery on the Sharp Zaurus

	  SL-5500 (collie) models.



config BATTERY_IPAQ_MICRO

	tristate "iPAQ Atmel Micro ASIC battery driver"

	depends on MFD_IPAQ_MICRO

	help

	  Choose this option if you want to monitor battery status on

	  Compaq/HP iPAQ h3100 and h3600.



config BATTERY_WM97XX

	bool "WM97xx generic battery driver"

	depends on TOUCHSCREEN_WM97XX=y

drivers/power/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -25,6 +25,7 @@ obj-$(CONFIG_BATTERY_PMU) += pmu_battery.o 
obj-$(CONFIG_BATTERY_OLPC)	+= olpc_battery.o

obj-$(CONFIG_BATTERY_TOSA)	+= tosa_battery.o

obj-$(CONFIG_BATTERY_COLLIE)	+= collie_battery.o

obj-$(CONFIG_BATTERY_IPAQ_MICRO) += ipaq_micro_battery.o

obj-$(CONFIG_BATTERY_WM97XX)	+= wm97xx_battery.o

obj-$(CONFIG_BATTERY_SBS)	+= sbs-battery.o

obj-$(CONFIG_BATTERY_BQ27x00)	+= bq27x00_battery.o

drivers/power/ipaq_micro_battery.c

0 → 100644
+290 −0
Original line number Diff line number Diff line 
/*

 * 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 struct power_supply micro_batt_power = {

	.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 struct power_supply micro_ac_power = {

	.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 int micro_batt_probe(struct platform_device *pdev)

{

	struct micro_battery *mb;



	mb = devm_kzalloc(&pdev->dev, sizeof(*mb), GFP_KERNEL);

	if (!mb)

		return -ENOMEM;



	mb->micro = dev_get_drvdata(pdev->dev.parent);

	mb->wq = create_singlethread_workqueue("ipaq-battery-wq");

	INIT_DELAYED_WORK(&mb->update, micro_battery_work);

	platform_set_drvdata(pdev, mb);

	queue_delayed_work(mb->wq, &mb->update, 1);

	power_supply_register(&pdev->dev, &micro_batt_power);

	power_supply_register(&pdev->dev, &micro_ac_power);



	dev_info(&pdev->dev, "iPAQ micro battery driver\n");

	return 0;

}



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);



	return 0;

}



static int micro_batt_suspend(struct device *dev)

{

	struct micro_battery *mb = dev_get_drvdata(dev);



	cancel_delayed_work_sync(&mb->update);

	return 0;

}



static int 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)

};



struct platform_driver micro_batt_device_driver = {

	.driver		= {

		.name	= "ipaq-micro-battery",

		.pm	= &micro_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:battery-ipaq-micro");

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