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Commit 808be4b2 authored by Vasily Khoruzhick's avatar Vasily Khoruzhick Committed by Anton Vorontsov
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Add s3c-adc-battery driver 



s3c-adc-battery is driver for monitoring and charging battery on
iPAQ H1930/H1940/RX1950.

It depends on s3c-adc driver to get battery voltage and current.

Signed-off-by: default avatarVasily Khoruzhick <anarsoul@gmail.com>
Signed-off-by: default avatarAnton Vorontsov <cbouatmailru@gmail.com>
parent 6721081b

drivers/power/Kconfig

+6 −0
Original line number Diff line number Diff line
@@ -136,6 +136,12 @@ config BATTERY_Z2 
	help

	  Say Y to include support for the battery on the Zipit Z2.



config BATTERY_S3C_ADC

	tristate "Battery driver for Samsung ADC based monitoring"

	depends on S3C_ADC

	help

	  Say Y here to enable support for iPAQ h1930/h1940/rx1950 battery



config CHARGER_PCF50633

	tristate "NXP PCF50633 MBC"

	depends on MFD_PCF50633

drivers/power/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -33,5 +33,6 @@ obj-$(CONFIG_BATTERY_BQ27x00) += bq27x00_battery.o 
obj-$(CONFIG_BATTERY_DA9030)	+= da9030_battery.o

obj-$(CONFIG_BATTERY_MAX17040)	+= max17040_battery.o

obj-$(CONFIG_BATTERY_Z2)	+= z2_battery.o

obj-$(CONFIG_BATTERY_S3C_ADC)	+= s3c_adc_battery.o

obj-$(CONFIG_CHARGER_PCF50633)	+= pcf50633-charger.o

obj-$(CONFIG_BATTERY_INTEL_MID)	+= intel_mid_battery.o

drivers/power/s3c_adc_battery.c

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/*

 *	iPAQ h1930/h1940/rx1950 battery controler driver

 *	Copyright (c) Vasily Khoruzhick

 *	Based on h1940_battery.c by Arnaud Patard

 *

 * This file is subject to the terms and conditions of the GNU General Public

 * License.  See the file COPYING in the main directory of this archive for

 * more details.

 *

 */



#include <linux/interrupt.h>

#include <linux/platform_device.h>

#include <linux/power_supply.h>

#include <linux/leds.h>

#include <linux/gpio.h>

#include <linux/err.h>

#include <linux/timer.h>

#include <linux/jiffies.h>

#include <linux/s3c_adc_battery.h>

#include <linux/errno.h>

#include <linux/init.h>



#include <plat/adc.h>



#define BAT_POLL_INTERVAL		10000 /* ms */

#define JITTER_DELAY			500 /* ms */



struct s3c_adc_bat {

	struct power_supply		psy;

	struct s3c_adc_client		*client;

	struct s3c_adc_bat_pdata	*pdata;

	int				volt_value;

	int				cur_value;

	unsigned int			timestamp;

	int				level;

	int				status;

	int				cable_plugged:1;

};



static struct delayed_work bat_work;



static void s3c_adc_bat_ext_power_changed(struct power_supply *psy)

{

	schedule_delayed_work(&bat_work,

		msecs_to_jiffies(JITTER_DELAY));

}



static enum power_supply_property s3c_adc_backup_bat_props[] = {

	POWER_SUPPLY_PROP_VOLTAGE_NOW,

	POWER_SUPPLY_PROP_VOLTAGE_MIN,

	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,

};



static int s3c_adc_backup_bat_get_property(struct power_supply *psy,

				enum power_supply_property psp,

				union power_supply_propval *val)

{

	struct s3c_adc_bat *bat = container_of(psy, struct s3c_adc_bat, psy);



	if (!bat) {

		dev_err(psy->dev, "%s: no battery infos ?!\n", __func__);

		return -EINVAL;

	}



	if (bat->volt_value < 0 ||

		jiffies_to_msecs(jiffies - bat->timestamp) >

			BAT_POLL_INTERVAL) {

		bat->volt_value = s3c_adc_read(bat->client,

			bat->pdata->backup_volt_channel);

		bat->volt_value *= bat->pdata->backup_volt_mult;

		bat->timestamp = jiffies;

	}



	switch (psp) {

	case POWER_SUPPLY_PROP_VOLTAGE_NOW:

		val->intval = bat->volt_value;

		return 0;

	case POWER_SUPPLY_PROP_VOLTAGE_MIN:

		val->intval = bat->pdata->backup_volt_min;

		return 0;

	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:

		val->intval = bat->pdata->backup_volt_max;

		return 0;

	default:

		return -EINVAL;

	}

}



static struct s3c_adc_bat backup_bat = {

	.psy = {

		.name		= "backup-battery",

		.type		= POWER_SUPPLY_TYPE_BATTERY,

		.properties	= s3c_adc_backup_bat_props,

		.num_properties = ARRAY_SIZE(s3c_adc_backup_bat_props),

		.get_property	= s3c_adc_backup_bat_get_property,

		.use_for_apm	= 1,

	},

};



static enum power_supply_property s3c_adc_main_bat_props[] = {

	POWER_SUPPLY_PROP_STATUS,

	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,

	POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN,

	POWER_SUPPLY_PROP_CHARGE_NOW,

	POWER_SUPPLY_PROP_VOLTAGE_NOW,

	POWER_SUPPLY_PROP_CURRENT_NOW,

};



static int calc_full_volt(int volt_val, int cur_val, int impedance)

{

	return volt_val + cur_val * impedance / 1000;

}



static int s3c_adc_bat_get_property(struct power_supply *psy,

				    enum power_supply_property psp,

				    union power_supply_propval *val)

{

	struct s3c_adc_bat *bat = container_of(psy, struct s3c_adc_bat, psy);



	int new_level;

	int full_volt;

	const struct s3c_adc_bat_thresh *lut = bat->pdata->lut_noac;

	unsigned int lut_size = bat->pdata->lut_noac_cnt;



	if (!bat) {

		dev_err(psy->dev, "no battery infos ?!\n");

		return -EINVAL;

	}



	if (bat->volt_value < 0 || bat->cur_value < 0 ||

		jiffies_to_msecs(jiffies - bat->timestamp) >

			BAT_POLL_INTERVAL) {

		bat->volt_value = s3c_adc_read(bat->client,

			bat->pdata->volt_channel) * bat->pdata->volt_mult;

		bat->cur_value = s3c_adc_read(bat->client,

			bat->pdata->current_channel) * bat->pdata->current_mult;

		bat->timestamp = jiffies;

	}



	if (bat->cable_plugged &&

		((bat->pdata->gpio_charge_finished < 0) ||

		!gpio_get_value(bat->pdata->gpio_charge_finished))) {

		lut = bat->pdata->lut_acin;

		lut_size = bat->pdata->lut_acin_cnt;

	}



	new_level = 100000;

	full_volt = calc_full_volt((bat->volt_value / 1000),

		(bat->cur_value / 1000), bat->pdata->internal_impedance);



	if (full_volt < calc_full_volt(lut->volt, lut->cur,

		bat->pdata->internal_impedance)) {

		lut_size--;

		while (lut_size--) {

			int lut_volt1;

			int lut_volt2;



			lut_volt1 = calc_full_volt(lut[0].volt, lut[0].cur,

				bat->pdata->internal_impedance);

			lut_volt2 = calc_full_volt(lut[1].volt, lut[1].cur,

				bat->pdata->internal_impedance);

			if (full_volt < lut_volt1 && full_volt >= lut_volt2) {

				new_level = (lut[1].level +

					(lut[0].level - lut[1].level) *

					(full_volt - lut_volt2) /

					(lut_volt1 - lut_volt2)) * 1000;

				break;

			}

			new_level = lut[1].level * 1000;

			lut++;

		}

	}



	bat->level = new_level;



	switch (psp) {

	case POWER_SUPPLY_PROP_STATUS:

		if (bat->pdata->gpio_charge_finished < 0)

			val->intval = bat->level == 100000 ?

				POWER_SUPPLY_STATUS_FULL : bat->status;

		else

			val->intval = bat->status;

		return 0;

	case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:

		val->intval = 100000;

		return 0;

	case POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN:

		val->intval = 0;

		return 0;

	case POWER_SUPPLY_PROP_CHARGE_NOW:

		val->intval = bat->level;

		return 0;

	case POWER_SUPPLY_PROP_VOLTAGE_NOW:

		val->intval = bat->volt_value;

		return 0;

	case POWER_SUPPLY_PROP_CURRENT_NOW:

		val->intval = bat->cur_value;

		return 0;

	default:

		return -EINVAL;

	}

}



static struct s3c_adc_bat main_bat = {

	.psy = {

		.name			= "main-battery",

		.type			= POWER_SUPPLY_TYPE_BATTERY,

		.properties		= s3c_adc_main_bat_props,

		.num_properties		= ARRAY_SIZE(s3c_adc_main_bat_props),

		.get_property		= s3c_adc_bat_get_property,

		.external_power_changed = s3c_adc_bat_ext_power_changed,

		.use_for_apm		= 1,

	},

};



static void s3c_adc_bat_work(struct work_struct *work)

{

	struct s3c_adc_bat *bat = &main_bat;

	int is_charged;

	int is_plugged;

	static int was_plugged;



	is_plugged = power_supply_am_i_supplied(&bat->psy);

	bat->cable_plugged = is_plugged;

	if (is_plugged != was_plugged) {

		was_plugged = is_plugged;

		if (is_plugged) {

			if (bat->pdata->enable_charger)

				bat->pdata->enable_charger();

			bat->status = POWER_SUPPLY_STATUS_CHARGING;

		} else {

			if (bat->pdata->disable_charger)

				bat->pdata->disable_charger();

			bat->status = POWER_SUPPLY_STATUS_DISCHARGING;

		}

	} else {

		if ((bat->pdata->gpio_charge_finished >= 0) && is_plugged) {

			is_charged = gpio_get_value(

				main_bat.pdata->gpio_charge_finished);

			if (is_charged) {

				if (bat->pdata->disable_charger)

					bat->pdata->disable_charger();

				bat->status = POWER_SUPPLY_STATUS_FULL;

			} else {

				if (bat->pdata->enable_charger)

					bat->pdata->enable_charger();

				bat->status = POWER_SUPPLY_STATUS_CHARGING;

			}

		}

	}



	power_supply_changed(&bat->psy);

}



static irqreturn_t s3c_adc_bat_charged(int irq, void *dev_id)

{

	schedule_delayed_work(&bat_work,

		msecs_to_jiffies(JITTER_DELAY));

	return IRQ_HANDLED;

}



static int __init s3c_adc_bat_probe(struct platform_device *pdev)

{

	struct s3c_adc_client	*client;

	struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;

	int ret;



	client = s3c_adc_register(pdev, NULL, NULL, 0);

	if (IS_ERR(client)) {

		dev_err(&pdev->dev, "cannot register adc\n");

		return PTR_ERR(client);

	}



	platform_set_drvdata(pdev, client);



	main_bat.client = client;

	main_bat.pdata = pdata;

	main_bat.volt_value = -1;

	main_bat.cur_value = -1;

	main_bat.cable_plugged = 0;

	main_bat.status = POWER_SUPPLY_STATUS_DISCHARGING;



	ret = power_supply_register(&pdev->dev, &main_bat.psy);

	if (ret)

		goto err_reg_main;

	if (pdata->backup_volt_mult) {

		backup_bat.client = client;

		backup_bat.pdata = pdev->dev.platform_data;

		backup_bat.volt_value = -1;

		ret = power_supply_register(&pdev->dev, &backup_bat.psy);

		if (ret)

			goto err_reg_backup;

	}



	INIT_DELAYED_WORK(&bat_work, s3c_adc_bat_work);



	if (pdata->gpio_charge_finished >= 0) {

		ret = gpio_request(pdata->gpio_charge_finished, "charged");

		if (ret)

			goto err_gpio;



		ret = request_irq(gpio_to_irq(pdata->gpio_charge_finished),

				s3c_adc_bat_charged,

				IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,

				"battery charged", NULL);

		if (ret)

			goto err_irq;

	}



	if (pdata->init) {

		ret = pdata->init();

		if (ret)

			goto err_platform;

	}



	dev_info(&pdev->dev, "successfully loaded\n");

	device_init_wakeup(&pdev->dev, 1);



	/* Schedule timer to check current status */

	schedule_delayed_work(&bat_work,

		msecs_to_jiffies(JITTER_DELAY));



	return 0;



err_platform:

	if (pdata->gpio_charge_finished >= 0)

		free_irq(gpio_to_irq(pdata->gpio_charge_finished), NULL);

err_irq:

	if (pdata->gpio_charge_finished >= 0)

		gpio_free(pdata->gpio_charge_finished);

err_gpio:

	if (pdata->backup_volt_mult)

		power_supply_unregister(&backup_bat.psy);

err_reg_backup:

	power_supply_unregister(&main_bat.psy);

err_reg_main:

	return ret;

}



static int s3c_adc_bat_remove(struct platform_device *pdev)

{

	struct s3c_adc_client *client = platform_get_drvdata(pdev);

	struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;



	power_supply_unregister(&main_bat.psy);

	if (pdata->backup_volt_mult)

		power_supply_unregister(&backup_bat.psy);



	s3c_adc_release(client);



	if (pdata->gpio_charge_finished >= 0) {

		free_irq(gpio_to_irq(pdata->gpio_charge_finished), NULL);

		gpio_free(pdata->gpio_charge_finished);

	}



	cancel_delayed_work(&bat_work);



	if (pdata->exit)

		pdata->exit();



	return 0;

}



#ifdef CONFIG_PM

static int s3c_adc_bat_suspend(struct platform_device *pdev,

	pm_message_t state)

{

	struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;



	if (pdata->gpio_charge_finished >= 0) {

		if (device_may_wakeup(&pdev->dev))

			enable_irq_wake(

				gpio_to_irq(pdata->gpio_charge_finished));

		else {

			disable_irq(gpio_to_irq(pdata->gpio_charge_finished));

			main_bat.pdata->disable_charger();

		}

	}



	return 0;

}



static int s3c_adc_bat_resume(struct platform_device *pdev)

{

	struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;



	if (pdata->gpio_charge_finished >= 0) {

		if (device_may_wakeup(&pdev->dev))

			disable_irq_wake(

				gpio_to_irq(pdata->gpio_charge_finished));

		else

			enable_irq(gpio_to_irq(pdata->gpio_charge_finished));

	}



	/* Schedule timer to check current status */

	schedule_delayed_work(&bat_work,

		msecs_to_jiffies(JITTER_DELAY));



	return 0;

}

#else

#define s3c_adc_battery_suspend NULL

#define s3c_adc_battery_resume NULL

#endif



static struct platform_driver s3c_adc_bat_driver = {

	.driver		= {

		.name	= "s3c-adc-battery",

	},

	.probe		= s3c_adc_bat_probe,

	.remove		= s3c_adc_bat_remove,

	.suspend	= s3c_adc_bat_suspend,

	.resume		= s3c_adc_bat_resume,

};



static int __init s3c_adc_bat_init(void)

{

	return platform_driver_register(&s3c_adc_bat_driver);

}

module_init(s3c_adc_bat_init);



static void __exit s3c_adc_bat_exit(void)

{

	platform_driver_unregister(&s3c_adc_bat_driver);

}

module_exit(s3c_adc_bat_exit);



MODULE_AUTHOR("Vasily Khoruzhick <anarsoul@gmail.com>");

MODULE_DESCRIPTION("iPAQ H1930/H1940/RX1950 battery controler driver");

MODULE_LICENSE("GPL");

include/linux/s3c_adc_battery.h

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#ifndef _S3C_ADC_BATTERY_H

#define _S3C_ADC_BATTERY_H



struct s3c_adc_bat_thresh {

	int volt; /* mV */

	int cur; /* mA */

	int level; /* percent */

};



struct s3c_adc_bat_pdata {

	int (*init)(void);

	void (*exit)(void);

	void (*enable_charger)(void);

	void (*disable_charger)(void);



	int gpio_charge_finished;



	const struct s3c_adc_bat_thresh *lut_noac;

	unsigned int lut_noac_cnt;

	const struct s3c_adc_bat_thresh *lut_acin;

	unsigned int lut_acin_cnt;



	const unsigned int volt_channel;

	const unsigned int current_channel;

	const unsigned int backup_volt_channel;



	const unsigned int volt_mult;

	const unsigned int current_mult;

	const unsigned int backup_volt_mult;

	const unsigned int internal_impedance;



	const unsigned int backup_volt_max;

	const unsigned int backup_volt_min;

};



#endif