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Commit fece4184 authored by Dmitry Eremin-Solenikov's avatar Dmitry Eremin-Solenikov Committed by Anton Vorontsov
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power_supply: Sharp SL-6000 (tosa) batteries support 



This patch adds common battery interface support for Sharp SL-6000 (tosa).

Signed-off-by: default avatarDmitry Baryshkov <dbaryshkov@gmail.com>
Signed-off-by: default avatarAnton Vorontsov <cbouatmailru@gmail.com>
parent 75d88079

drivers/power/Kconfig

+7 −0
Original line number Diff line number Diff line
@@ -49,4 +49,11 @@ config BATTERY_OLPC 
	help

	  Say Y to enable support for the battery on the OLPC laptop.



config BATTERY_TOSA

	tristate "Sharp SL-6000 (tosa) battery"

	depends on MACH_TOSA && MFD_TC6393XB

	help

	  Say Y to enable support for the battery on the Sharp Zaurus

	  SL-6000 (tosa) models.



endif # POWER_SUPPLY

drivers/power/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -20,3 +20,4 @@ obj-$(CONFIG_APM_POWER) += apm_power.o 
obj-$(CONFIG_BATTERY_DS2760)	+= ds2760_battery.o

obj-$(CONFIG_BATTERY_PMU)	+= pmu_battery.o

obj-$(CONFIG_BATTERY_OLPC)	+= olpc_battery.o

obj-$(CONFIG_BATTERY_TOSA)	+= tosa_battery.o

drivers/power/tosa_battery.c

0 → 100644
+486 −0
Original line number Diff line number Diff line 
/*

 * Battery and Power Management code for the Sharp SL-6000x

 *

 * Copyright (c) 2005 Dirk Opfer

 * Copyright (c) 2008 Dmitry Baryshkov

 *

 * 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/kernel.h>

#include <linux/module.h>

#include <linux/power_supply.h>

#include <linux/wm97xx.h>

#include <linux/delay.h>

#include <linux/spinlock.h>

#include <linux/interrupt.h>

#include <linux/gpio.h>



#include <asm/mach-types.h>

#include <asm/arch/tosa.h>



static DEFINE_MUTEX(bat_lock); /* protects gpio pins */

static struct work_struct bat_work;



struct tosa_bat {

	int status;

	struct power_supply psy;

	int full_chrg;



	struct mutex work_lock; /* protects data */



	bool (*is_present)(struct tosa_bat *bat);

	int gpio_full;

	int gpio_charge_off;



	int technology;



	int gpio_bat;

	int adc_bat;

	int adc_bat_divider;

	int bat_max;

	int bat_min;



	int gpio_temp;

	int adc_temp;

	int adc_temp_divider;

};



static struct tosa_bat tosa_bat_main;

static struct tosa_bat tosa_bat_jacket;



static unsigned long tosa_read_bat(struct tosa_bat *bat)

{

	unsigned long value = 0;



	if (bat->gpio_bat < 0 || bat->adc_bat < 0)

		return 0;



	mutex_lock(&bat_lock);

	gpio_set_value(bat->gpio_bat, 1);

	msleep(5);

	value = wm97xx_read_aux_adc(bat->psy.dev->parent->driver_data,

			bat->adc_bat);

	gpio_set_value(bat->gpio_bat, 0);

	mutex_unlock(&bat_lock);



	value = value * 1000000 / bat->adc_bat_divider;



	return value;

}



static unsigned long tosa_read_temp(struct tosa_bat *bat)

{

	unsigned long value = 0;



	if (bat->gpio_temp < 0 || bat->adc_temp < 0)

		return 0;



	mutex_lock(&bat_lock);

	gpio_set_value(bat->gpio_temp, 1);

	msleep(5);

	value = wm97xx_read_aux_adc(bat->psy.dev->parent->driver_data,

			bat->adc_temp);

	gpio_set_value(bat->gpio_temp, 0);

	mutex_unlock(&bat_lock);



	value = value * 10000 / bat->adc_temp_divider;



	return value;

}



static int tosa_bat_get_property(struct power_supply *psy,

			    enum power_supply_property psp,

			    union power_supply_propval *val)

{

	int ret = 0;

	struct tosa_bat *bat = container_of(psy, struct tosa_bat, 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 = tosa_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 = tosa_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 bool tosa_jacket_bat_is_present(struct tosa_bat *bat)

{

	return gpio_get_value(TOSA_GPIO_JACKET_DETECT) == 0;

}



static void tosa_bat_external_power_changed(struct power_supply *psy)

{

	schedule_work(&bat_work);

}



static irqreturn_t tosa_bat_gpio_isr(int irq, void *data)

{

	pr_info("tosa_bat_gpio irq: %d\n", gpio_get_value(irq_to_gpio(irq)));

	schedule_work(&bat_work);

	return IRQ_HANDLED;

}



static void tosa_bat_update(struct tosa_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->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) {

			gpio_set_value(bat->gpio_charge_off, 0);

			mdelay(15);

		}



		if (gpio_get_value(bat->gpio_full)) {

			if (old == POWER_SUPPLY_STATUS_CHARGING ||

					bat->full_chrg == -1)

				bat->full_chrg = tosa_read_bat(bat);



			gpio_set_value(bat->gpio_charge_off, 1);

			bat->status = POWER_SUPPLY_STATUS_FULL;

		} else {

			gpio_set_value(bat->gpio_charge_off, 0);

			bat->status = POWER_SUPPLY_STATUS_CHARGING;

		}

	} else {

		gpio_set_value(bat->gpio_charge_off, 1);

		bat->status = POWER_SUPPLY_STATUS_DISCHARGING;

	}



	if (old != bat->status)

		power_supply_changed(psy);



	mutex_unlock(&bat->work_lock);

}



static void tosa_bat_work(struct work_struct *work)

{

	tosa_bat_update(&tosa_bat_main);

	tosa_bat_update(&tosa_bat_jacket);

}





static enum power_supply_property tosa_bat_main_props[] = {

	POWER_SUPPLY_PROP_STATUS,

	POWER_SUPPLY_PROP_TECHNOLOGY,

	POWER_SUPPLY_PROP_VOLTAGE_NOW,

	POWER_SUPPLY_PROP_VOLTAGE_MAX,

	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,

	POWER_SUPPLY_PROP_TEMP,

	POWER_SUPPLY_PROP_PRESENT,

};



static enum power_supply_property tosa_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_PRESENT,

};



static struct tosa_bat tosa_bat_main = {

	.status = POWER_SUPPLY_STATUS_DISCHARGING,

	.full_chrg = -1,

	.psy = {

		.name		= "main-battery",

		.type		= POWER_SUPPLY_TYPE_BATTERY,

		.properties	= tosa_bat_main_props,

		.num_properties	= ARRAY_SIZE(tosa_bat_main_props),

		.get_property	= tosa_bat_get_property,

		.external_power_changed = tosa_bat_external_power_changed,

		.use_for_apm	= 1,

	},



	.gpio_full = TOSA_GPIO_BAT0_CRG,

	.gpio_charge_off = TOSA_GPIO_CHARGE_OFF,



	.technology = POWER_SUPPLY_TECHNOLOGY_LIPO,



	.gpio_bat = TOSA_GPIO_BAT0_V_ON,

	.adc_bat = WM97XX_AUX_ID3,

	.adc_bat_divider = 414,

	.bat_max = 4310000,

	.bat_min = 1551 * 1000000 / 414,



	.gpio_temp = TOSA_GPIO_BAT1_TH_ON,

	.adc_temp = WM97XX_AUX_ID2,

	.adc_temp_divider = 10000,

};



static struct tosa_bat tosa_bat_jacket = {

	.status = POWER_SUPPLY_STATUS_DISCHARGING,

	.full_chrg = -1,

	.psy = {

		.name		= "jacket-battery",

		.type		= POWER_SUPPLY_TYPE_BATTERY,

		.properties	= tosa_bat_main_props,

		.num_properties	= ARRAY_SIZE(tosa_bat_main_props),

		.get_property	= tosa_bat_get_property,

		.external_power_changed = tosa_bat_external_power_changed,

	},



	.is_present = tosa_jacket_bat_is_present,

	.gpio_full = TOSA_GPIO_BAT1_CRG,

	.gpio_charge_off = TOSA_GPIO_CHARGE_OFF_JC,



	.technology = POWER_SUPPLY_TECHNOLOGY_LIPO,



	.gpio_bat = TOSA_GPIO_BAT1_V_ON,

	.adc_bat = WM97XX_AUX_ID3,

	.adc_bat_divider = 414,

	.bat_max = 4310000,

	.bat_min = 1551 * 1000000 / 414,



	.gpio_temp = TOSA_GPIO_BAT0_TH_ON,

	.adc_temp = WM97XX_AUX_ID2,

	.adc_temp_divider = 10000,

};



static struct tosa_bat tosa_bat_bu = {

	.status = POWER_SUPPLY_STATUS_UNKNOWN,

	.full_chrg = -1,



	.psy = {

		.name		= "backup-battery",

		.type		= POWER_SUPPLY_TYPE_BATTERY,

		.properties	= tosa_bat_bu_props,

		.num_properties	= ARRAY_SIZE(tosa_bat_bu_props),

		.get_property	= tosa_bat_get_property,

		.external_power_changed = tosa_bat_external_power_changed,

	},



	.gpio_full = -1,

	.gpio_charge_off = -1,



	.technology = POWER_SUPPLY_TECHNOLOGY_LiMn,



	.gpio_bat = TOSA_GPIO_BU_CHRG_ON,

	.adc_bat = WM97XX_AUX_ID4,

	.adc_bat_divider = 1266,



	.gpio_temp = -1,

	.adc_temp = -1,

	.adc_temp_divider = -1,

};



static struct {

	int gpio;

	char *name;

	bool output;

	int value;

} gpios[] = {

	{ TOSA_GPIO_CHARGE_OFF,		"main charge off",	1, 1 },

	{ TOSA_GPIO_CHARGE_OFF_JC,	"jacket charge off",	1, 1 },

	{ TOSA_GPIO_BAT_SW_ON,		"battery switch",	1, 0 },

	{ TOSA_GPIO_BAT0_V_ON,		"main battery",		1, 0 },

	{ TOSA_GPIO_BAT1_V_ON,		"jacket battery",	1, 0 },

	{ TOSA_GPIO_BAT1_TH_ON,		"main battery temp",	1, 0 },

	{ TOSA_GPIO_BAT0_TH_ON,		"jacket battery temp",	1, 0 },

	{ TOSA_GPIO_BU_CHRG_ON,		"backup battery",	1, 0 },

	{ TOSA_GPIO_BAT0_CRG,		"main battery full",	0, 0 },

	{ TOSA_GPIO_BAT1_CRG,		"jacket battery full",	0, 0 },

	{ TOSA_GPIO_BAT0_LOW,		"main battery low",	0, 0 },

	{ TOSA_GPIO_BAT1_LOW,		"jacket battery low",	0, 0 },

	{ TOSA_GPIO_JACKET_DETECT,	"jacket detect",	0, 0 },

};



#ifdef CONFIG_PM

static int tosa_bat_suspend(struct platform_device *dev, pm_message_t state)

{

	/* flush all pending status updates */

	flush_scheduled_work();

	return 0;

}



static int tosa_bat_resume(struct platform_device *dev)

{

	/* things may have changed while we were away */

	schedule_work(&bat_work);

	return 0;

}

#else

#define tosa_bat_suspend NULL

#define tosa_bat_resume NULL

#endif



static int __devinit tosa_bat_probe(struct platform_device *dev)

{

	int ret;

	int i;



	if (!machine_is_tosa())

		return -ENODEV;



	for (i = 0; i < ARRAY_SIZE(gpios); i++) {

		ret = gpio_request(gpios[i].gpio, gpios[i].name);

		if (ret) {

			i--;

			goto err_gpio;

		}



		if (gpios[i].output)

			ret = gpio_direction_output(gpios[i].gpio,

					gpios[i].value);

		else

			ret = gpio_direction_input(gpios[i].gpio);



		if (ret)

			goto err_gpio;

	}



	mutex_init(&tosa_bat_main.work_lock);

	mutex_init(&tosa_bat_jacket.work_lock);



	INIT_WORK(&bat_work, tosa_bat_work);



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

	if (ret)

		goto err_psy_reg_main;

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

	if (ret)

		goto err_psy_reg_jacket;

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

	if (ret)

		goto err_psy_reg_bu;



	ret = request_irq(gpio_to_irq(TOSA_GPIO_BAT0_CRG),

				tosa_bat_gpio_isr,

				IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,

				"main full", &tosa_bat_main);

	if (ret)

		goto err_req_main;



	ret = request_irq(gpio_to_irq(TOSA_GPIO_BAT1_CRG),

				tosa_bat_gpio_isr,

				IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,

				"jacket full", &tosa_bat_jacket);

	if (ret)

		goto err_req_jacket;



	ret = request_irq(gpio_to_irq(TOSA_GPIO_JACKET_DETECT),

				tosa_bat_gpio_isr,

				IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,

				"jacket detect", &tosa_bat_jacket);

	if (!ret) {

		schedule_work(&bat_work);

		return 0;

	}



	free_irq(gpio_to_irq(TOSA_GPIO_BAT1_CRG), &tosa_bat_jacket);

err_req_jacket:

	free_irq(gpio_to_irq(TOSA_GPIO_BAT0_CRG), &tosa_bat_main);

err_req_main:

	power_supply_unregister(&tosa_bat_bu.psy);

err_psy_reg_bu:

	power_supply_unregister(&tosa_bat_jacket.psy);

err_psy_reg_jacket:

	power_supply_unregister(&tosa_bat_main.psy);

err_psy_reg_main:



	/* see comment in tosa_bat_remove */

	flush_scheduled_work();



	i--;

err_gpio:

	for (; i >= 0; i--)

		gpio_free(gpios[i].gpio);



	return ret;

}



static int __devexit tosa_bat_remove(struct platform_device *dev)

{

	int i;



	free_irq(gpio_to_irq(TOSA_GPIO_JACKET_DETECT), &tosa_bat_jacket);

	free_irq(gpio_to_irq(TOSA_GPIO_BAT1_CRG), &tosa_bat_jacket);

	free_irq(gpio_to_irq(TOSA_GPIO_BAT0_CRG), &tosa_bat_main);



	power_supply_unregister(&tosa_bat_bu.psy);

	power_supply_unregister(&tosa_bat_jacket.psy);

	power_supply_unregister(&tosa_bat_main.psy);



	/*

	 * now flush all pending work.

	 * we won't get any more schedules, since all

	 * sources (isr and external_power_changed)

	 * are unregistered now.

	 */

	flush_scheduled_work();



	for (i = ARRAY_SIZE(gpios) - 1; i >= 0; i--)

		gpio_free(gpios[i].gpio);



	return 0;

}



static struct platform_driver tosa_bat_driver = {

	.driver.name	= "wm97xx-battery",

	.driver.owner	= THIS_MODULE,

	.probe		= tosa_bat_probe,

	.remove		= __devexit_p(tosa_bat_remove),

	.suspend	= tosa_bat_suspend,

	.resume		= tosa_bat_resume,

};



static int __init tosa_bat_init(void)

{

	return platform_driver_register(&tosa_bat_driver);

}



static void __exit tosa_bat_exit(void)

{

	platform_driver_unregister(&tosa_bat_driver);

}



module_init(tosa_bat_init);

module_exit(tosa_bat_exit);



MODULE_LICENSE("GPL");

MODULE_AUTHOR("Dmitry Baryshkov");

MODULE_DESCRIPTION("Tosa battery driver");

MODULE_ALIAS("platform:wm97xx-battery");