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Commit f6a21388 authored by Lars-Peter Clausen's avatar Lars-Peter Clausen Committed by Ralf Baechle
Browse files

POWER: Add JZ4740 battery driver. 



Add support for the battery voltage measurement part of the JZ4740 ADC unit.

Signed-off-by: default avatarLars-Peter Clausen <lars@metafoo.de>
Acked-by: default avatarAnton Vorontsov <cbouatmailru@gmail.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/1416/


Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 7f983ba9

drivers/power/Kconfig

+11 −0
Original line number Diff line number Diff line
@@ -142,4 +142,15 @@ config CHARGER_PCF50633 
	help

	 Say Y to include support for NXP PCF50633 Main Battery Charger.



config BATTERY_JZ4740

	tristate "Ingenic JZ4740 battery"

	depends on MACH_JZ4740

	depends on MFD_JZ4740_ADC

	help

	  Say Y to enable support for the battery on Ingenic JZ4740 based

	  boards.



	  This driver can be build as a module. If so, the module will be

	  called jz4740-battery.



endif # POWER_SUPPLY

drivers/power/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -34,3 +34,4 @@ obj-$(CONFIG_BATTERY_DA9030) += da9030_battery.o 
obj-$(CONFIG_BATTERY_MAX17040)	+= max17040_battery.o

obj-$(CONFIG_BATTERY_Z2)	+= z2_battery.o

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

obj-$(CONFIG_BATTERY_JZ4740)	+= jz4740-battery.o

drivers/power/jz4740-battery.c

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/*

 * Battery measurement code for Ingenic JZ SOC.

 *

 * Copyright (C) 2009 Jiejing Zhang <kzjeef@gmail.com>

 * Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>

 *

 * based on tosa_battery.c

 *

 * Copyright (C) 2008 Marek Vasut <marek.vasut@gmail.com>

*

 * 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.

 *

 */



#include <linux/interrupt.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/slab.h>



#include <linux/delay.h>

#include <linux/gpio.h>

#include <linux/mfd/core.h>

#include <linux/power_supply.h>



#include <linux/power/jz4740-battery.h>

#include <linux/jz4740-adc.h>



struct jz_battery {

	struct jz_battery_platform_data *pdata;

	struct platform_device *pdev;



	struct resource *mem;

	void __iomem *base;



	int irq;

	int charge_irq;



	struct mfd_cell *cell;



	int status;

	long voltage;



	struct completion read_completion;



	struct power_supply battery;

	struct delayed_work work;

};



static inline struct jz_battery *psy_to_jz_battery(struct power_supply *psy)

{

	return container_of(psy, struct jz_battery, battery);

}



static irqreturn_t jz_battery_irq_handler(int irq, void *devid)

{

	struct jz_battery *battery = devid;



	complete(&battery->read_completion);

	return IRQ_HANDLED;

}



static long jz_battery_read_voltage(struct jz_battery *battery)

{

	unsigned long t;

	unsigned long val;

	long voltage;



	INIT_COMPLETION(battery->read_completion);



	enable_irq(battery->irq);

	battery->cell->enable(battery->pdev);



	t = wait_for_completion_interruptible_timeout(&battery->read_completion,

		HZ);



	if (t > 0) {

		val = readw(battery->base) & 0xfff;



		if (battery->pdata->info.voltage_max_design <= 2500000)

			val = (val * 78125UL) >> 7UL;

		else

			val = ((val * 924375UL) >> 9UL) + 33000;

		voltage = (long)val;

	} else {

		voltage = t ? t : -ETIMEDOUT;

	}



	battery->cell->disable(battery->pdev);

	disable_irq(battery->irq);



	return voltage;

}



static int jz_battery_get_capacity(struct power_supply *psy)

{

	struct jz_battery *jz_battery = psy_to_jz_battery(psy);

	struct power_supply_info *info = &jz_battery->pdata->info;

	long voltage;

	int ret;

	int voltage_span;



	voltage = jz_battery_read_voltage(jz_battery);



	if (voltage < 0)

		return voltage;



	voltage_span = info->voltage_max_design - info->voltage_min_design;

	ret = ((voltage - info->voltage_min_design) * 100) / voltage_span;



	if (ret > 100)

		ret = 100;

	else if (ret < 0)

		ret = 0;



	return ret;

}



static int jz_battery_get_property(struct power_supply *psy,

	enum power_supply_property psp, union power_supply_propval *val)

{

	struct jz_battery *jz_battery = psy_to_jz_battery(psy);

	struct power_supply_info *info = &jz_battery->pdata->info;

	long voltage;



	switch (psp) {

	case POWER_SUPPLY_PROP_STATUS:

		val->intval = jz_battery->status;

		break;

	case POWER_SUPPLY_PROP_TECHNOLOGY:

		val->intval = jz_battery->pdata->info.technology;

		break;

	case POWER_SUPPLY_PROP_HEALTH:

		voltage = jz_battery_read_voltage(jz_battery);

		if (voltage < info->voltage_min_design)

			val->intval = POWER_SUPPLY_HEALTH_DEAD;

		else

			val->intval = POWER_SUPPLY_HEALTH_GOOD;

		break;

	case POWER_SUPPLY_PROP_CAPACITY:

		val->intval = jz_battery_get_capacity(psy);

		break;

	case POWER_SUPPLY_PROP_VOLTAGE_NOW:

		val->intval = jz_battery_read_voltage(jz_battery);

		if (val->intval < 0)

			return val->intval;

		break;

	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:

		val->intval = info->voltage_max_design;

		break;

	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:

		val->intval = info->voltage_min_design;

		break;

	case POWER_SUPPLY_PROP_PRESENT:

		val->intval = 1;

		break;

	default:

		return -EINVAL;

	}

	return 0;

}



static void jz_battery_external_power_changed(struct power_supply *psy)

{

	struct jz_battery *jz_battery = psy_to_jz_battery(psy);



	cancel_delayed_work(&jz_battery->work);

	schedule_delayed_work(&jz_battery->work, 0);

}



static irqreturn_t jz_battery_charge_irq(int irq, void *data)

{

	struct jz_battery *jz_battery = data;



	cancel_delayed_work(&jz_battery->work);

	schedule_delayed_work(&jz_battery->work, 0);



	return IRQ_HANDLED;

}



static void jz_battery_update(struct jz_battery *jz_battery)

{

	int status;

	long voltage;

	bool has_changed = false;

	int is_charging;



	if (gpio_is_valid(jz_battery->pdata->gpio_charge)) {

		is_charging = gpio_get_value(jz_battery->pdata->gpio_charge);

		is_charging ^= jz_battery->pdata->gpio_charge_active_low;

		if (is_charging)

			status = POWER_SUPPLY_STATUS_CHARGING;

		else

			status = POWER_SUPPLY_STATUS_NOT_CHARGING;



		if (status != jz_battery->status) {

			jz_battery->status = status;

			has_changed = true;

		}

	}



	voltage = jz_battery_read_voltage(jz_battery);

	if (abs(voltage - jz_battery->voltage) < 50000) {

		jz_battery->voltage = voltage;

		has_changed = true;

	}



	if (has_changed)

		power_supply_changed(&jz_battery->battery);

}



static enum power_supply_property jz_battery_properties[] = {

	POWER_SUPPLY_PROP_STATUS,

	POWER_SUPPLY_PROP_TECHNOLOGY,

	POWER_SUPPLY_PROP_HEALTH,

	POWER_SUPPLY_PROP_CAPACITY,

	POWER_SUPPLY_PROP_VOLTAGE_NOW,

	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,

	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,

	POWER_SUPPLY_PROP_PRESENT,

};



static void jz_battery_work(struct work_struct *work)

{

	/* Too small interval will increase system workload */

	const int interval = HZ * 30;

	struct jz_battery *jz_battery = container_of(work, struct jz_battery,

					    work.work);



	jz_battery_update(jz_battery);

	schedule_delayed_work(&jz_battery->work, interval);

}



static int __devinit jz_battery_probe(struct platform_device *pdev)

{

	int ret = 0;

	struct jz_battery_platform_data *pdata = pdev->dev.parent->platform_data;

	struct jz_battery *jz_battery;

	struct power_supply *battery;



	jz_battery = kzalloc(sizeof(*jz_battery), GFP_KERNEL);

	if (!jz_battery) {

		dev_err(&pdev->dev, "Failed to allocate driver structure\n");

		return -ENOMEM;

	}



	jz_battery->cell = pdev->dev.platform_data;



	jz_battery->irq = platform_get_irq(pdev, 0);

	if (jz_battery->irq < 0) {

		ret = jz_battery->irq;

		dev_err(&pdev->dev, "Failed to get platform irq: %d\n", ret);

		goto err_free;

	}



	jz_battery->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	if (!jz_battery->mem) {

		ret = -ENOENT;

		dev_err(&pdev->dev, "Failed to get platform mmio resource\n");

		goto err_free;

	}



	jz_battery->mem = request_mem_region(jz_battery->mem->start,

				resource_size(jz_battery->mem),	pdev->name);

	if (!jz_battery->mem) {

		ret = -EBUSY;

		dev_err(&pdev->dev, "Failed to request mmio memory region\n");

		goto err_free;

	}



	jz_battery->base = ioremap_nocache(jz_battery->mem->start,

				resource_size(jz_battery->mem));

	if (!jz_battery->base) {

		ret = -EBUSY;

		dev_err(&pdev->dev, "Failed to ioremap mmio memory\n");

		goto err_release_mem_region;

	}



	battery = &jz_battery->battery;

	battery->name = pdata->info.name;

	battery->type = POWER_SUPPLY_TYPE_BATTERY;

	battery->properties	= jz_battery_properties;

	battery->num_properties	= ARRAY_SIZE(jz_battery_properties);

	battery->get_property = jz_battery_get_property;

	battery->external_power_changed = jz_battery_external_power_changed;

	battery->use_for_apm = 1;



	jz_battery->pdata = pdata;

	jz_battery->pdev = pdev;



	init_completion(&jz_battery->read_completion);



	INIT_DELAYED_WORK(&jz_battery->work, jz_battery_work);



	ret = request_irq(jz_battery->irq, jz_battery_irq_handler, 0, pdev->name,

			jz_battery);

	if (ret) {

		dev_err(&pdev->dev, "Failed to request irq %d\n", ret);

		goto err_iounmap;

	}

	disable_irq(jz_battery->irq);



	if (gpio_is_valid(pdata->gpio_charge)) {

		ret = gpio_request(pdata->gpio_charge, dev_name(&pdev->dev));

		if (ret) {

			dev_err(&pdev->dev, "charger state gpio request failed.\n");

			goto err_free_irq;

		}

		ret = gpio_direction_input(pdata->gpio_charge);

		if (ret) {

			dev_err(&pdev->dev, "charger state gpio set direction failed.\n");

			goto err_free_gpio;

		}



		jz_battery->charge_irq = gpio_to_irq(pdata->gpio_charge);



		if (jz_battery->charge_irq >= 0) {

			ret = request_irq(jz_battery->charge_irq,

				    jz_battery_charge_irq,

				    IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,

				    dev_name(&pdev->dev), jz_battery);

			if (ret) {

				dev_err(&pdev->dev, "Failed to request charge irq: %d\n", ret);

				goto err_free_gpio;

			}

		}

	} else {

		jz_battery->charge_irq = -1;

	}



	if (jz_battery->pdata->info.voltage_max_design <= 2500000)

		jz4740_adc_set_config(pdev->dev.parent, JZ_ADC_CONFIG_BAT_MB,

			JZ_ADC_CONFIG_BAT_MB);

	else

		jz4740_adc_set_config(pdev->dev.parent, JZ_ADC_CONFIG_BAT_MB, 0);



	ret = power_supply_register(&pdev->dev, &jz_battery->battery);

	if (ret) {

		dev_err(&pdev->dev, "power supply battery register failed.\n");

		goto err_free_charge_irq;

	}



	platform_set_drvdata(pdev, jz_battery);

	schedule_delayed_work(&jz_battery->work, 0);



	return 0;



err_free_charge_irq:

	if (jz_battery->charge_irq >= 0)

		free_irq(jz_battery->charge_irq, jz_battery);

err_free_gpio:

	if (gpio_is_valid(pdata->gpio_charge))

		gpio_free(jz_battery->pdata->gpio_charge);

err_free_irq:

	free_irq(jz_battery->irq, jz_battery);

err_iounmap:

	platform_set_drvdata(pdev, NULL);

	iounmap(jz_battery->base);

err_release_mem_region:

	release_mem_region(jz_battery->mem->start, resource_size(jz_battery->mem));

err_free:

	kfree(jz_battery);

	return ret;

}



static int __devexit jz_battery_remove(struct platform_device *pdev)

{

	struct jz_battery *jz_battery = platform_get_drvdata(pdev);



	cancel_delayed_work_sync(&jz_battery->work);



	if (gpio_is_valid(jz_battery->pdata->gpio_charge)) {

		if (jz_battery->charge_irq >= 0)

			free_irq(jz_battery->charge_irq, jz_battery);

		gpio_free(jz_battery->pdata->gpio_charge);

	}



	power_supply_unregister(&jz_battery->battery);



	free_irq(jz_battery->irq, jz_battery);



	iounmap(jz_battery->base);

	release_mem_region(jz_battery->mem->start, resource_size(jz_battery->mem));



	return 0;

}



#ifdef CONFIG_PM

static int jz_battery_suspend(struct device *dev)

{

	struct jz_battery *jz_battery = dev_get_drvdata(dev);



	cancel_delayed_work_sync(&jz_battery->work);

	jz_battery->status = POWER_SUPPLY_STATUS_UNKNOWN;



	return 0;

}



static int jz_battery_resume(struct device *dev)

{

	struct jz_battery *jz_battery = dev_get_drvdata(dev);



	schedule_delayed_work(&jz_battery->work, 0);



	return 0;

}



static const struct dev_pm_ops jz_battery_pm_ops = {

	.suspend	= jz_battery_suspend,

	.resume		= jz_battery_resume,

};



#define JZ_BATTERY_PM_OPS (&jz_battery_pm_ops)

#else

#define JZ_BATTERY_PM_OPS NULL

#endif



static struct platform_driver jz_battery_driver = {

	.probe		= jz_battery_probe,

	.remove		= __devexit_p(jz_battery_remove),

	.driver = {

		.name = "jz4740-battery",

		.owner = THIS_MODULE,

		.pm = JZ_BATTERY_PM_OPS,

	},

};



static int __init jz_battery_init(void)

{

	return platform_driver_register(&jz_battery_driver);

}

module_init(jz_battery_init);



static void __exit jz_battery_exit(void)

{

	platform_driver_unregister(&jz_battery_driver);

}

module_exit(jz_battery_exit);



MODULE_ALIAS("platform:jz4740-battery");

MODULE_LICENSE("GPL");

MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");

MODULE_DESCRIPTION("JZ4740 SoC battery driver");

include/linux/power/jz4740-battery.h

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/*

 *  Copyright (C) 2009, Jiejing Zhang <kzjeef@gmail.com>

 *

 *  This program is free software; you can redistribute	 it and/or modify it

 *  under  the terms of	 the GNU General  Public License as published by the

 *  Free Software Foundation;  either version 2 of the	License, or (at your

 *  option) any later version.

 *

 *  You should have received a copy of the  GNU General Public License along

 *  with this program; if not, write  to the Free Software Foundation, Inc.,

 *  675 Mass Ave, Cambridge, MA 02139, USA.

 *

 */



#ifndef __JZ4740_BATTERY_H

#define __JZ4740_BATTERY_H



struct jz_battery_platform_data {

	struct power_supply_info info;

	int gpio_charge;	/* GPIO port of Charger state */

	int gpio_charge_active_low;

};



#endif