drivers/power/supply/collie_battery.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Battery and Power Management code for the Sharp SL-5x00
  *
  * Copyright (C) 2009 Thomas Kunze
  *
  * based on tosa_battery.c
  */
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/power_supply.h>
 #include <linux/delay.h>
 #include <linux/spinlock.h>
 #include <linux/interrupt.h>
 #include <linux/gpio/driver.h>
 #include <linux/gpio/machine.h>
 #include <linux/gpio/consumer.h>
 #include <linux/mfd/ucb1x00.h>

 #include <asm/mach/sharpsl_param.h>
 #include <asm/mach-types.h>
 #include <mach/collie.h>

 static DEFINE_MUTEX(bat_lock); /* protects gpio pins */
 static struct work_struct bat_work;
 static struct ucb1x00 *ucb;

 struct collie_bat {
 	int status;
 	struct power_supply *psy;
 	int full_chrg;

 	struct mutex work_lock; /* protects data */

 	bool (*is_present)(struct collie_bat *bat);
 	struct gpio_desc *gpio_full;
 	struct gpio_desc *gpio_charge_on;

 	int technology;

 	struct gpio_desc *gpio_bat;
 	int adc_bat;
 	int adc_bat_divider;
 	int bat_max;
 	int bat_min;

 	struct gpio_desc *gpio_temp;
 	int adc_temp;
 	int adc_temp_divider;
 };

 static struct collie_bat collie_bat_main;

 static unsigned long collie_read_bat(struct collie_bat *bat)
 {
 	unsigned long value = 0;

 	if (!bat->gpio_bat || bat->adc_bat < 0)
 		return 0;
 	mutex_lock(&bat_lock);
 	gpiod_set_value(bat->gpio_bat, 1);
 	msleep(5);
 	ucb1x00_adc_enable(ucb);
 	value = ucb1x00_adc_read(ucb, bat->adc_bat, UCB_SYNC);
 	ucb1x00_adc_disable(ucb);
 	gpiod_set_value(bat->gpio_bat, 0);
 	mutex_unlock(&bat_lock);
 	value = value * 1000000 / bat->adc_bat_divider;

 	return value;
 }

 static unsigned long collie_read_temp(struct collie_bat *bat)
 {
 	unsigned long value = 0;
 	if (!bat->gpio_temp || bat->adc_temp < 0)
 		return 0;

 	mutex_lock(&bat_lock);
 	gpiod_set_value(bat->gpio_temp, 1);
 	msleep(5);
 	ucb1x00_adc_enable(ucb);
 	value = ucb1x00_adc_read(ucb, bat->adc_temp, UCB_SYNC);
 	ucb1x00_adc_disable(ucb);
 	gpiod_set_value(bat->gpio_temp, 0);
 	mutex_unlock(&bat_lock);

 	value = value * 10000 / bat->adc_temp_divider;

 	return value;
 }

 static int collie_bat_get_property(struct power_supply *psy,
 			    enum power_supply_property psp,
 			    union power_supply_propval *val)
 {
 	int ret = 0;
 	struct collie_bat *bat = power_supply_get_drvdata(psy);

 	if (bat->is_present && !bat->is_present(bat)
 			&& psp != POWER_SUPPLY_PROP_PRESENT) {
 		return -ENODEV;
 	}

 	switch (psp) {
 	case POWER_SUPPLY_PROP_STATUS:
 		val->intval = bat->status;
 		break;
 	case POWER_SUPPLY_PROP_TECHNOLOGY:
 		val->intval = bat->technology;
 		break;
 	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 		val->intval = collie_read_bat(bat);
 		break;
 	case POWER_SUPPLY_PROP_VOLTAGE_MAX:
 		if (bat->full_chrg == -1)
 			val->intval = bat->bat_max;
 		else
 			val->intval = bat->full_chrg;
 		break;
 	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
 		val->intval = bat->bat_max;
 		break;
 	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 		val->intval = bat->bat_min;
 		break;
 	case POWER_SUPPLY_PROP_TEMP:
 		val->intval = collie_read_temp(bat);
 		break;
 	case POWER_SUPPLY_PROP_PRESENT:
 		val->intval = bat->is_present ? bat->is_present(bat) : 1;
 		break;
 	default:
 		ret = -EINVAL;
 		break;
 	}
 	return ret;
 }

 static void collie_bat_external_power_changed(struct power_supply *psy)
 {
 	schedule_work(&bat_work);
 }

 static irqreturn_t collie_bat_gpio_isr(int irq, void *data)
 {
 	pr_info("collie_bat_gpio irq\n");
 	schedule_work(&bat_work);
 	return IRQ_HANDLED;
 }

 static void collie_bat_update(struct collie_bat *bat)
 {
 	int old;
 	struct power_supply *psy = bat->psy;

 	mutex_lock(&bat->work_lock);

 	old = bat->status;

 	if (bat->is_present && !bat->is_present(bat)) {
 		printk(KERN_NOTICE "%s not present\n", psy->desc->name);
 		bat->status = POWER_SUPPLY_STATUS_UNKNOWN;
 		bat->full_chrg = -1;
 	} else if (power_supply_am_i_supplied(psy)) {
 		if (bat->status == POWER_SUPPLY_STATUS_DISCHARGING) {
 			gpiod_set_value(bat->gpio_charge_on, 1);
 			mdelay(15);
 		}

 		if (gpiod_get_value(bat->gpio_full)) {
 			if (old == POWER_SUPPLY_STATUS_CHARGING ||
 					bat->full_chrg == -1)
 				bat->full_chrg = collie_read_bat(bat);

 			gpiod_set_value(bat->gpio_charge_on, 0);
 			bat->status = POWER_SUPPLY_STATUS_FULL;
 		} else {
 			gpiod_set_value(bat->gpio_charge_on, 1);
 			bat->status = POWER_SUPPLY_STATUS_CHARGING;
 		}
 	} else {
 		gpiod_set_value(bat->gpio_charge_on, 0);
 		bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
 	}

 	if (old != bat->status)
 		power_supply_changed(psy);

 	mutex_unlock(&bat->work_lock);
 }

 static void collie_bat_work(struct work_struct *work)
 {
 	collie_bat_update(&collie_bat_main);
 }


 static enum power_supply_property collie_bat_main_props[] = {
 	POWER_SUPPLY_PROP_STATUS,
 	POWER_SUPPLY_PROP_TECHNOLOGY,
 	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 	POWER_SUPPLY_PROP_VOLTAGE_NOW,
 	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
 	POWER_SUPPLY_PROP_VOLTAGE_MAX,
 	POWER_SUPPLY_PROP_PRESENT,
 	POWER_SUPPLY_PROP_TEMP,
 };

 static enum power_supply_property collie_bat_bu_props[] = {
 	POWER_SUPPLY_PROP_STATUS,
 	POWER_SUPPLY_PROP_TECHNOLOGY,
 	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 	POWER_SUPPLY_PROP_VOLTAGE_NOW,
 	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
 	POWER_SUPPLY_PROP_VOLTAGE_MAX,
 	POWER_SUPPLY_PROP_PRESENT,
 };

 static const struct power_supply_desc collie_bat_main_desc = {
 	.name		= "main-battery",
 	.type		= POWER_SUPPLY_TYPE_BATTERY,
 	.properties	= collie_bat_main_props,
 	.num_properties	= ARRAY_SIZE(collie_bat_main_props),
 	.get_property	= collie_bat_get_property,
 	.external_power_changed = collie_bat_external_power_changed,
 	.use_for_apm	= 1,
 };

 static struct collie_bat collie_bat_main = {
 	.status = POWER_SUPPLY_STATUS_DISCHARGING,
 	.full_chrg = -1,
 	.psy = NULL,

 	.gpio_full = NULL,
 	.gpio_charge_on = NULL,

 	.technology = POWER_SUPPLY_TECHNOLOGY_LIPO,

 	.gpio_bat = NULL,
 	.adc_bat = UCB_ADC_INP_AD1,
 	.adc_bat_divider = 155,
 	.bat_max = 4310000,
 	.bat_min = 1551 * 1000000 / 414,

 	.gpio_temp = NULL,
 	.adc_temp = UCB_ADC_INP_AD0,
 	.adc_temp_divider = 10000,
 };

 static const struct power_supply_desc collie_bat_bu_desc = {
 	.name		= "backup-battery",
 	.type		= POWER_SUPPLY_TYPE_BATTERY,
 	.properties	= collie_bat_bu_props,
 	.num_properties	= ARRAY_SIZE(collie_bat_bu_props),
 	.get_property	= collie_bat_get_property,
 	.external_power_changed = collie_bat_external_power_changed,
 };

 static struct collie_bat collie_bat_bu = {
 	.status = POWER_SUPPLY_STATUS_UNKNOWN,
 	.full_chrg = -1,
 	.psy = NULL,

 	.gpio_full = NULL,
 	.gpio_charge_on = NULL,

 	.technology = POWER_SUPPLY_TECHNOLOGY_LiMn,

 	.gpio_bat = NULL,
 	.adc_bat = UCB_ADC_INP_AD1,
 	.adc_bat_divider = 155,
 	.bat_max = 3000000,
 	.bat_min = 1900000,

 	.gpio_temp = NULL,
 	.adc_temp = -1,
 	.adc_temp_divider = -1,
 };

 /* Obtained but unused GPIO */
 static struct gpio_desc *collie_mbat_low;

 #ifdef CONFIG_PM
 static int wakeup_enabled;

 static int collie_bat_suspend(struct ucb1x00_dev *dev)
 {
 	/* flush all pending status updates */
 	flush_work(&bat_work);

 	if (device_may_wakeup(&dev->ucb->dev) &&
 	    collie_bat_main.status == POWER_SUPPLY_STATUS_CHARGING)
 		wakeup_enabled = !enable_irq_wake(gpiod_to_irq(collie_bat_main.gpio_full));
 	else
 		wakeup_enabled = 0;

 	return 0;
 }

 static int collie_bat_resume(struct ucb1x00_dev *dev)
 {
 	if (wakeup_enabled)
 		disable_irq_wake(gpiod_to_irq(collie_bat_main.gpio_full));

 	/* things may have changed while we were away */
 	schedule_work(&bat_work);
 	return 0;
 }
 #else
 #define collie_bat_suspend NULL
 #define collie_bat_resume NULL
 #endif

 static int collie_bat_probe(struct ucb1x00_dev *dev)
 {
 	int ret;
 	struct power_supply_config psy_main_cfg = {}, psy_bu_cfg = {};
 	struct gpio_chip *gc = &dev->ucb->gpio;

 	if (!machine_is_collie())
 		return -ENODEV;

 	ucb = dev->ucb;

 	/* Obtain all the main battery GPIOs */
 	collie_bat_main.gpio_full = gpiod_get(&dev->ucb->dev,
 					      "main battery full",
 					      GPIOD_IN);
 	if (IS_ERR(collie_bat_main.gpio_full))
 		return PTR_ERR(collie_bat_main.gpio_full);

 	collie_mbat_low = gpiod_get(&dev->ucb->dev,
 				    "main battery low",
 				    GPIOD_IN);
 	if (IS_ERR(collie_mbat_low)) {
 		ret = PTR_ERR(collie_mbat_low);
 		goto err_put_gpio_full;
 	}

 	collie_bat_main.gpio_charge_on = gpiod_get(&dev->ucb->dev,
 						   "main charge on",
 						   GPIOD_OUT_LOW);
 	if (IS_ERR(collie_bat_main.gpio_charge_on)) {
 		ret = PTR_ERR(collie_bat_main.gpio_charge_on);
 		goto err_put_mbat_low;
 	}

 	/* COLLIE_GPIO_MBAT_ON = GPIO 7 on the UCB (TC35143) */
 	collie_bat_main.gpio_bat = gpiochip_request_own_desc(gc,
 						7,
 						"main battery",
 						GPIO_ACTIVE_HIGH,
 						GPIOD_OUT_LOW);
 	if (IS_ERR(collie_bat_main.gpio_bat)) {
 		ret = PTR_ERR(collie_bat_main.gpio_bat);
 		goto err_put_gpio_charge_on;
 	}

 	/* COLLIE_GPIO_TMP_ON = GPIO 9 on the UCB (TC35143) */
 	collie_bat_main.gpio_temp = gpiochip_request_own_desc(gc,
 						9,
 						"main battery temp",
 						GPIO_ACTIVE_HIGH,
 						GPIOD_OUT_LOW);
 	if (IS_ERR(collie_bat_main.gpio_temp)) {
 		ret = PTR_ERR(collie_bat_main.gpio_temp);
 		goto err_free_gpio_bat;
 	}

 	/*
 	 * Obtain the backup battery COLLIE_GPIO_BBAT_ON which is
 	 * GPIO 8 on the UCB (TC35143)
 	 */
 	collie_bat_bu.gpio_bat = gpiochip_request_own_desc(gc,
 						8,
 						"backup battery",
 						GPIO_ACTIVE_HIGH,
 						GPIOD_OUT_LOW);
 	if (IS_ERR(collie_bat_bu.gpio_bat)) {
 		ret = PTR_ERR(collie_bat_bu.gpio_bat);
 		goto err_free_gpio_temp;
 	}

 	mutex_init(&collie_bat_main.work_lock);

 	INIT_WORK(&bat_work, collie_bat_work);

 	psy_main_cfg.drv_data = &collie_bat_main;
 	collie_bat_main.psy = power_supply_register(&dev->ucb->dev,
 						    &collie_bat_main_desc,
 						    &psy_main_cfg);
 	if (IS_ERR(collie_bat_main.psy)) {
 		ret = PTR_ERR(collie_bat_main.psy);
 		goto err_psy_reg_main;
 	}

 	psy_bu_cfg.drv_data = &collie_bat_bu;
 	collie_bat_bu.psy = power_supply_register(&dev->ucb->dev,
 						  &collie_bat_bu_desc,
 						  &psy_bu_cfg);
 	if (IS_ERR(collie_bat_bu.psy)) {
 		ret = PTR_ERR(collie_bat_bu.psy);
 		goto err_psy_reg_bu;
 	}

 	ret = request_irq(gpio_to_irq(COLLIE_GPIO_CO),
 				collie_bat_gpio_isr,
 				IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
 				"main full", &collie_bat_main);
 	if (ret)
 		goto err_irq;

 	device_init_wakeup(&ucb->dev, 1);
 	schedule_work(&bat_work);

 	return 0;

 err_irq:
 	power_supply_unregister(collie_bat_bu.psy);
 err_psy_reg_bu:
 	power_supply_unregister(collie_bat_main.psy);
 err_psy_reg_main:
 	/* see comment in collie_bat_remove */
 	cancel_work_sync(&bat_work);
 	gpiochip_free_own_desc(collie_bat_bu.gpio_bat);
 err_free_gpio_temp:
 	gpiochip_free_own_desc(collie_bat_main.gpio_temp);
 err_free_gpio_bat:
 	gpiochip_free_own_desc(collie_bat_main.gpio_bat);
 err_put_gpio_charge_on:
 	gpiod_put(collie_bat_main.gpio_charge_on);
 err_put_mbat_low:
 	gpiod_put(collie_mbat_low);
 err_put_gpio_full:
 	gpiod_put(collie_bat_main.gpio_full);

 	return ret;
 }

 static void collie_bat_remove(struct ucb1x00_dev *dev)
 {
 	free_irq(gpio_to_irq(COLLIE_GPIO_CO), &collie_bat_main);
 	power_supply_unregister(collie_bat_bu.psy);
 	power_supply_unregister(collie_bat_main.psy);

 	/* These are obtained from the machine */
 	gpiod_put(collie_bat_main.gpio_full);
 	gpiod_put(collie_mbat_low);
 	gpiod_put(collie_bat_main.gpio_charge_on);
 	/* These are directly from the UCB so let's free them */
 	gpiochip_free_own_desc(collie_bat_main.gpio_bat);
 	gpiochip_free_own_desc(collie_bat_main.gpio_temp);
 	gpiochip_free_own_desc(collie_bat_bu.gpio_bat);
 	/*
 	 * Now cancel the bat_work.  We won't get any more schedules,
 	 * since all sources (isr and external_power_changed) are
 	 * unregistered now.
 	 */
 	cancel_work_sync(&bat_work);
 }

 static struct ucb1x00_driver collie_bat_driver = {
 	.add		= collie_bat_probe,
 	.remove		= collie_bat_remove,
 	.suspend	= collie_bat_suspend,
 	.resume		= collie_bat_resume,
 };

 static int __init collie_bat_init(void)
 {
 	return ucb1x00_register_driver(&collie_bat_driver);
 }

 static void __exit collie_bat_exit(void)
 {
 	ucb1x00_unregister_driver(&collie_bat_driver);
 }

 module_init(collie_bat_init);
 module_exit(collie_bat_exit);

 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Thomas Kunze");
 MODULE_DESCRIPTION("Collie battery driver");
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* Battery and Power Management code for the Sharp SL-5x00
	*
	* Copyright (C) 2009 Thomas Kunze
	*
	* based on tosa_battery.c
	*/
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/power_supply.h>
	#include <linux/delay.h>
	#include <linux/spinlock.h>
	#include <linux/interrupt.h>
	#include <linux/gpio/driver.h>
	#include <linux/gpio/machine.h>
	#include <linux/gpio/consumer.h>
	#include <linux/mfd/ucb1x00.h>

	#include <asm/mach/sharpsl_param.h>
	#include <asm/mach-types.h>
	#include <mach/collie.h>

	static DEFINE_MUTEX(bat_lock); /* protects gpio pins */
	static struct work_struct bat_work;
	static struct ucb1x00 *ucb;

	struct collie_bat {
	int status;
	struct power_supply *psy;
	int full_chrg;

	struct mutex work_lock; /* protects data */

	bool (is_present)(struct collie_bat bat);
	struct gpio_desc *gpio_full;
	struct gpio_desc *gpio_charge_on;

	int technology;

	struct gpio_desc *gpio_bat;
	int adc_bat;
	int adc_bat_divider;
	int bat_max;
	int bat_min;

	struct gpio_desc *gpio_temp;
	int adc_temp;
	int adc_temp_divider;
	};

	static struct collie_bat collie_bat_main;

	static unsigned long collie_read_bat(struct collie_bat *bat)
	{
	unsigned long value = 0;

	if (!bat->gpio_bat \|\| bat->adc_bat < 0)
	return 0;
	mutex_lock(&bat_lock);
	gpiod_set_value(bat->gpio_bat, 1);
	msleep(5);
	ucb1x00_adc_enable(ucb);
	value = ucb1x00_adc_read(ucb, bat->adc_bat, UCB_SYNC);
	ucb1x00_adc_disable(ucb);
	gpiod_set_value(bat->gpio_bat, 0);
	mutex_unlock(&bat_lock);
	value = value * 1000000 / bat->adc_bat_divider;

	return value;
	}

	static unsigned long collie_read_temp(struct collie_bat *bat)
	{
	unsigned long value = 0;
	if (!bat->gpio_temp \|\| bat->adc_temp < 0)
	return 0;

	mutex_lock(&bat_lock);
	gpiod_set_value(bat->gpio_temp, 1);
	msleep(5);
	ucb1x00_adc_enable(ucb);
	value = ucb1x00_adc_read(ucb, bat->adc_temp, UCB_SYNC);
	ucb1x00_adc_disable(ucb);
	gpiod_set_value(bat->gpio_temp, 0);
	mutex_unlock(&bat_lock);

	value = value * 10000 / bat->adc_temp_divider;

	return value;
	}

	static int collie_bat_get_property(struct power_supply *psy,
	enum power_supply_property psp,
	union power_supply_propval *val)
	{
	int ret = 0;
	struct collie_bat *bat = power_supply_get_drvdata(psy);

	if (bat->is_present && !bat->is_present(bat)
	&& psp != POWER_SUPPLY_PROP_PRESENT) {
	return -ENODEV;
	}

	switch (psp) {
	case POWER_SUPPLY_PROP_STATUS:
	val->intval = bat->status;
	break;
	case POWER_SUPPLY_PROP_TECHNOLOGY:
	val->intval = bat->technology;
	break;
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
	val->intval = collie_read_bat(bat);
	break;
	case POWER_SUPPLY_PROP_VOLTAGE_MAX:
	if (bat->full_chrg == -1)
	val->intval = bat->bat_max;
	else
	val->intval = bat->full_chrg;
	break;
	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
	val->intval = bat->bat_max;
	break;
	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
	val->intval = bat->bat_min;
	break;
	case POWER_SUPPLY_PROP_TEMP:
	val->intval = collie_read_temp(bat);
	break;
	case POWER_SUPPLY_PROP_PRESENT:
	val->intval = bat->is_present ? bat->is_present(bat) : 1;
	break;
	default:
	ret = -EINVAL;
	break;
	}
	return ret;
	}

	static void collie_bat_external_power_changed(struct power_supply *psy)
	{
	schedule_work(&bat_work);
	}

	static irqreturn_t collie_bat_gpio_isr(int irq, void *data)
	{
	pr_info("collie_bat_gpio irq\n");
	schedule_work(&bat_work);
	return IRQ_HANDLED;
	}

	static void collie_bat_update(struct collie_bat *bat)
	{
	int old;
	struct power_supply *psy = bat->psy;

	mutex_lock(&bat->work_lock);

	old = bat->status;

	if (bat->is_present && !bat->is_present(bat)) {
	printk(KERN_NOTICE "%s not present\n", psy->desc->name);
	bat->status = POWER_SUPPLY_STATUS_UNKNOWN;
	bat->full_chrg = -1;
	} else if (power_supply_am_i_supplied(psy)) {
	if (bat->status == POWER_SUPPLY_STATUS_DISCHARGING) {
	gpiod_set_value(bat->gpio_charge_on, 1);
	mdelay(15);
	}

	if (gpiod_get_value(bat->gpio_full)) {
	if (old == POWER_SUPPLY_STATUS_CHARGING \|\|
	bat->full_chrg == -1)
	bat->full_chrg = collie_read_bat(bat);

	gpiod_set_value(bat->gpio_charge_on, 0);
	bat->status = POWER_SUPPLY_STATUS_FULL;
	} else {
	gpiod_set_value(bat->gpio_charge_on, 1);
	bat->status = POWER_SUPPLY_STATUS_CHARGING;
	}
	} else {
	gpiod_set_value(bat->gpio_charge_on, 0);
	bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
	}

	if (old != bat->status)
	power_supply_changed(psy);

	mutex_unlock(&bat->work_lock);
	}

	static void collie_bat_work(struct work_struct *work)
	{
	collie_bat_update(&collie_bat_main);
	}


	static enum power_supply_property collie_bat_main_props[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_TECHNOLOGY,
	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
	POWER_SUPPLY_PROP_VOLTAGE_MAX,
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_TEMP,
	};

	static enum power_supply_property collie_bat_bu_props[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_TECHNOLOGY,
	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
	POWER_SUPPLY_PROP_VOLTAGE_MAX,
	POWER_SUPPLY_PROP_PRESENT,
	};

	static const struct power_supply_desc collie_bat_main_desc = {
	.name = "main-battery",
	.type = POWER_SUPPLY_TYPE_BATTERY,
	.properties = collie_bat_main_props,
	.num_properties = ARRAY_SIZE(collie_bat_main_props),
	.get_property = collie_bat_get_property,
	.external_power_changed = collie_bat_external_power_changed,
	.use_for_apm = 1,
	};

	static struct collie_bat collie_bat_main = {
	.status = POWER_SUPPLY_STATUS_DISCHARGING,
	.full_chrg = -1,
	.psy = NULL,

	.gpio_full = NULL,
	.gpio_charge_on = NULL,

	.technology = POWER_SUPPLY_TECHNOLOGY_LIPO,

	.gpio_bat = NULL,
	.adc_bat = UCB_ADC_INP_AD1,
	.adc_bat_divider = 155,
	.bat_max = 4310000,
	.bat_min = 1551 * 1000000 / 414,

	.gpio_temp = NULL,
	.adc_temp = UCB_ADC_INP_AD0,
	.adc_temp_divider = 10000,
	};

	static const struct power_supply_desc collie_bat_bu_desc = {
	.name = "backup-battery",
	.type = POWER_SUPPLY_TYPE_BATTERY,
	.properties = collie_bat_bu_props,
	.num_properties = ARRAY_SIZE(collie_bat_bu_props),
	.get_property = collie_bat_get_property,
	.external_power_changed = collie_bat_external_power_changed,
	};

	static struct collie_bat collie_bat_bu = {
	.status = POWER_SUPPLY_STATUS_UNKNOWN,
	.full_chrg = -1,
	.psy = NULL,

	.gpio_full = NULL,
	.gpio_charge_on = NULL,

	.technology = POWER_SUPPLY_TECHNOLOGY_LiMn,

	.gpio_bat = NULL,
	.adc_bat = UCB_ADC_INP_AD1,
	.adc_bat_divider = 155,
	.bat_max = 3000000,
	.bat_min = 1900000,

	.gpio_temp = NULL,
	.adc_temp = -1,
	.adc_temp_divider = -1,
	};

	/* Obtained but unused GPIO */
	static struct gpio_desc *collie_mbat_low;

	#ifdef CONFIG_PM
	static int wakeup_enabled;

	static int collie_bat_suspend(struct ucb1x00_dev *dev)
	{
	/* flush all pending status updates */
	flush_work(&bat_work);

	if (device_may_wakeup(&dev->ucb->dev) &&
	collie_bat_main.status == POWER_SUPPLY_STATUS_CHARGING)
	wakeup_enabled = !enable_irq_wake(gpiod_to_irq(collie_bat_main.gpio_full));
	else
	wakeup_enabled = 0;

	return 0;
	}

	static int collie_bat_resume(struct ucb1x00_dev *dev)
	{
	if (wakeup_enabled)
	disable_irq_wake(gpiod_to_irq(collie_bat_main.gpio_full));

	/* things may have changed while we were away */
	schedule_work(&bat_work);
	return 0;
	}
	#else
	#define collie_bat_suspend NULL
	#define collie_bat_resume NULL
	#endif

	static int collie_bat_probe(struct ucb1x00_dev *dev)
	{
	int ret;
	struct power_supply_config psy_main_cfg = {}, psy_bu_cfg = {};
	struct gpio_chip *gc = &dev->ucb->gpio;

	if (!machine_is_collie())
	return -ENODEV;

	ucb = dev->ucb;

	/* Obtain all the main battery GPIOs */
	collie_bat_main.gpio_full = gpiod_get(&dev->ucb->dev,
	"main battery full",
	GPIOD_IN);
	if (IS_ERR(collie_bat_main.gpio_full))
	return PTR_ERR(collie_bat_main.gpio_full);

	collie_mbat_low = gpiod_get(&dev->ucb->dev,
	"main battery low",
	GPIOD_IN);
	if (IS_ERR(collie_mbat_low)) {
	ret = PTR_ERR(collie_mbat_low);
	goto err_put_gpio_full;
	}

	collie_bat_main.gpio_charge_on = gpiod_get(&dev->ucb->dev,
	"main charge on",
	GPIOD_OUT_LOW);
	if (IS_ERR(collie_bat_main.gpio_charge_on)) {
	ret = PTR_ERR(collie_bat_main.gpio_charge_on);
	goto err_put_mbat_low;
	}

	/* COLLIE_GPIO_MBAT_ON = GPIO 7 on the UCB (TC35143) */
	collie_bat_main.gpio_bat = gpiochip_request_own_desc(gc,
	7,
	"main battery",
	GPIO_ACTIVE_HIGH,
	GPIOD_OUT_LOW);
	if (IS_ERR(collie_bat_main.gpio_bat)) {
	ret = PTR_ERR(collie_bat_main.gpio_bat);
	goto err_put_gpio_charge_on;
	}

	/* COLLIE_GPIO_TMP_ON = GPIO 9 on the UCB (TC35143) */
	collie_bat_main.gpio_temp = gpiochip_request_own_desc(gc,
	9,
	"main battery temp",
	GPIO_ACTIVE_HIGH,
	GPIOD_OUT_LOW);
	if (IS_ERR(collie_bat_main.gpio_temp)) {
	ret = PTR_ERR(collie_bat_main.gpio_temp);
	goto err_free_gpio_bat;
	}

	/*
	* Obtain the backup battery COLLIE_GPIO_BBAT_ON which is
	* GPIO 8 on the UCB (TC35143)
	*/
	collie_bat_bu.gpio_bat = gpiochip_request_own_desc(gc,
	8,
	"backup battery",
	GPIO_ACTIVE_HIGH,
	GPIOD_OUT_LOW);
	if (IS_ERR(collie_bat_bu.gpio_bat)) {
	ret = PTR_ERR(collie_bat_bu.gpio_bat);
	goto err_free_gpio_temp;
	}

	mutex_init(&collie_bat_main.work_lock);

	INIT_WORK(&bat_work, collie_bat_work);

	psy_main_cfg.drv_data = &collie_bat_main;
	collie_bat_main.psy = power_supply_register(&dev->ucb->dev,
	&collie_bat_main_desc,
	&psy_main_cfg);
	if (IS_ERR(collie_bat_main.psy)) {
	ret = PTR_ERR(collie_bat_main.psy);
	goto err_psy_reg_main;
	}

	psy_bu_cfg.drv_data = &collie_bat_bu;
	collie_bat_bu.psy = power_supply_register(&dev->ucb->dev,
	&collie_bat_bu_desc,
	&psy_bu_cfg);
	if (IS_ERR(collie_bat_bu.psy)) {
	ret = PTR_ERR(collie_bat_bu.psy);
	goto err_psy_reg_bu;
	}

	ret = request_irq(gpio_to_irq(COLLIE_GPIO_CO),
	collie_bat_gpio_isr,
	IRQF_TRIGGER_RISING \| IRQF_TRIGGER_FALLING,
	"main full", &collie_bat_main);
	if (ret)
	goto err_irq;

	device_init_wakeup(&ucb->dev, 1);
	schedule_work(&bat_work);

	return 0;

	err_irq:
	power_supply_unregister(collie_bat_bu.psy);
	err_psy_reg_bu:
	power_supply_unregister(collie_bat_main.psy);
	err_psy_reg_main:
	/* see comment in collie_bat_remove */
	cancel_work_sync(&bat_work);
	gpiochip_free_own_desc(collie_bat_bu.gpio_bat);
	err_free_gpio_temp:
	gpiochip_free_own_desc(collie_bat_main.gpio_temp);
	err_free_gpio_bat:
	gpiochip_free_own_desc(collie_bat_main.gpio_bat);
	err_put_gpio_charge_on:
	gpiod_put(collie_bat_main.gpio_charge_on);
	err_put_mbat_low:
	gpiod_put(collie_mbat_low);
	err_put_gpio_full:
	gpiod_put(collie_bat_main.gpio_full);

	return ret;
	}

	static void collie_bat_remove(struct ucb1x00_dev *dev)
	{
	free_irq(gpio_to_irq(COLLIE_GPIO_CO), &collie_bat_main);
	power_supply_unregister(collie_bat_bu.psy);
	power_supply_unregister(collie_bat_main.psy);

	/* These are obtained from the machine */
	gpiod_put(collie_bat_main.gpio_full);
	gpiod_put(collie_mbat_low);
	gpiod_put(collie_bat_main.gpio_charge_on);
	/* These are directly from the UCB so let's free them */
	gpiochip_free_own_desc(collie_bat_main.gpio_bat);
	gpiochip_free_own_desc(collie_bat_main.gpio_temp);
	gpiochip_free_own_desc(collie_bat_bu.gpio_bat);
	/*
	* Now cancel the bat_work. We won't get any more schedules,
	* since all sources (isr and external_power_changed) are
	* unregistered now.
	*/
	cancel_work_sync(&bat_work);
	}

	static struct ucb1x00_driver collie_bat_driver = {
	.add = collie_bat_probe,
	.remove = collie_bat_remove,
	.suspend = collie_bat_suspend,
	.resume = collie_bat_resume,
	};

	static int __init collie_bat_init(void)
	{
	return ucb1x00_register_driver(&collie_bat_driver);
	}

	static void __exit collie_bat_exit(void)
	{
	ucb1x00_unregister_driver(&collie_bat_driver);
	}

	module_init(collie_bat_init);
	module_exit(collie_bat_exit);

	MODULE_LICENSE("GPL");
	MODULE_AUTHOR("Thomas Kunze");
	MODULE_DESCRIPTION("Collie battery driver");