drivers/power/ipaq_micro_battery.c - arm/linux - Git at Google

 /*
  * 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 = create_singlethread_workqueue("ipaq-battery-wq");
 	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,
 						 &micro_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,
 					       &micro_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_ac_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 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)
 };

 static 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");
	/*
	* 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 = create_singlethread_workqueue("ipaq-battery-wq");
	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,
	&micro_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,
	&micro_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_ac_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 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)
	};

	static 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");