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Commit d4b19c42 authored by Marek Vašut's avatar Marek Vašut Committed by Russell King
Browse files

[ARM] 5155/1: PalmTX battery monitor 



This patch adds battery monitoring driver for PalmTX.
It can read voltage from the battery and temperature.
It also monitors charging/discharging status.

Signed-off-by: default avatarMarek Vasut <marek.vasut@gmail.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 35978408

arch/arm/mach-pxa/palmtx.c

+62 −0
Original line number Original line Diff line number Diff line
@@ -22,6 +22,7 @@ 
#include <linux/irq.h>

#include <linux/irq.h>

#include <linux/gpio_keys.h>

#include <linux/gpio_keys.h>

#include <linux/input.h>

#include <linux/input.h>

#include <linux/pda_power.h>

#include <linux/pwm_backlight.h>

#include <linux/pwm_backlight.h>

#include <linux/gpio.h>

#include <linux/gpio.h>
@@ -278,6 +279,66 @@ static struct pxa2xx_udc_mach_info palmtx_udc_info __initdata = { 
	.udc_command		= palmtx_udc_command,

	.udc_command		= palmtx_udc_command,

};

};





/******************************************************************************

 * Power supply

 ******************************************************************************/

static int power_supply_init(struct device *dev)

{

	int ret;



	ret = gpio_request(GPIO_NR_PALMTX_POWER_DETECT, "CABLE_STATE_AC");

	if (ret)

		goto err_cs_ac;



	ret = gpio_request(GPIO_NR_PALMTX_USB_DETECT_N, "CABLE_STATE_USB");

	if (ret)

		goto err_cs_usb;



	return 0;



err_cs_usb:

	gpio_free(GPIO_NR_PALMTX_POWER_DETECT);

err_cs_ac:

	return ret;

}



static int palmtx_is_ac_online(void)

{

	return gpio_get_value(GPIO_NR_PALMTX_POWER_DETECT);

}



static int palmtx_is_usb_online(void)

{

	return !gpio_get_value(GPIO_NR_PALMTX_USB_DETECT_N);

}



static void power_supply_exit(struct device *dev)

{

	gpio_free(GPIO_NR_PALMTX_USB_DETECT_N);

	gpio_free(GPIO_NR_PALMTX_POWER_DETECT);

}



static char *palmtx_supplicants[] = {

	"main-battery",

};



static struct pda_power_pdata power_supply_info = {

	.init            = power_supply_init,

	.is_ac_online    = palmtx_is_ac_online,

	.is_usb_online   = palmtx_is_usb_online,

	.exit            = power_supply_exit,

	.supplied_to     = palmtx_supplicants,

	.num_supplicants = ARRAY_SIZE(palmtx_supplicants),

};



static struct platform_device power_supply = {

	.name = "pda-power",

	.id   = -1,

	.dev  = {

		.platform_data = &power_supply_info,

	},

};



/******************************************************************************

/******************************************************************************

 * Framebuffer

 * Framebuffer

 ******************************************************************************/

 ******************************************************************************/
@@ -312,6 +373,7 @@ static struct platform_device *devices[] __initdata = { 
	&palmtx_pxa_keys,

	&palmtx_pxa_keys,

#endif

#endif

	&palmtx_backlight,

	&palmtx_backlight,

	&power_supply,

};

};





static struct map_desc palmtx_io_desc[] __initdata = {

static struct map_desc palmtx_io_desc[] __initdata = {

drivers/power/Kconfig

+6 −0
Original line number Original line Diff line number Diff line
@@ -49,4 +49,10 @@ config BATTERY_OLPC 
	help

	help

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

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





config BATTERY_PALMTX

	tristate "Palm T|X battery"

	depends on MACH_PALMTX

	help

	  Say Y to enable support for the battery in Palm T|X.



endif # POWER_SUPPLY
 
endif # POWER_SUPPLY

drivers/power/Makefile

+1 −0
Original line number Original line 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_DS2760)	+= ds2760_battery.o

obj-$(CONFIG_BATTERY_PMU)	+= pmu_battery.o

obj-$(CONFIG_BATTERY_PMU)	+= pmu_battery.o

obj-$(CONFIG_BATTERY_OLPC)	+= olpc_battery.o

obj-$(CONFIG_BATTERY_OLPC)	+= olpc_battery.o

obj-$(CONFIG_BATTERY_PALMTX)	+= palmtx_battery.o

drivers/power/palmtx_battery.c

0 → 100644
+198 −0
Original line number Original line Diff line number Diff line 
/*

 * linux/drivers/power/palmtx_battery.c

 *

 * Battery measurement code for Palm T|X Handheld computer

 *

 * 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/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/palmtx.h>



static DEFINE_MUTEX(bat_lock);

static struct work_struct bat_work;

struct mutex work_lock;

int bat_status = POWER_SUPPLY_STATUS_DISCHARGING;



static unsigned long palmtx_read_bat(struct power_supply *bat_ps)

{

	return wm97xx_read_aux_adc(bat_ps->dev->parent->driver_data,

				    WM97XX_AUX_ID3) * 1000 / 414;

}



static unsigned long palmtx_read_temp(struct power_supply *bat_ps)

{

	return wm97xx_read_aux_adc(bat_ps->dev->parent->driver_data,

				    WM97XX_AUX_ID2);

}



static int palmtx_bat_get_property(struct power_supply *bat_ps,

			    enum power_supply_property psp,

			    union power_supply_propval *val)

{

	switch (psp) {

	case POWER_SUPPLY_PROP_STATUS:

		val->intval = bat_status;

		break;

	case POWER_SUPPLY_PROP_TECHNOLOGY:

		val->intval = POWER_SUPPLY_TECHNOLOGY_LIPO;

		break;

	case POWER_SUPPLY_PROP_VOLTAGE_NOW:

		val->intval = palmtx_read_bat(bat_ps);

		break;

	case POWER_SUPPLY_PROP_VOLTAGE_MAX:

	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:

		val->intval = PALMTX_BAT_MAX_VOLTAGE;

		break;

	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:

		val->intval = PALMTX_BAT_MIN_VOLTAGE;

		break;

	case POWER_SUPPLY_PROP_TEMP:

		val->intval = palmtx_read_temp(bat_ps);

		break;

	case POWER_SUPPLY_PROP_PRESENT:

		val->intval = 1;

		break;

	default:

		return -EINVAL;

	}

	return 0;

}



static void palmtx_bat_external_power_changed(struct power_supply *bat_ps)

{

	schedule_work(&bat_work);

}



static char *status_text[] = {

	[POWER_SUPPLY_STATUS_UNKNOWN] =		"Unknown",

	[POWER_SUPPLY_STATUS_CHARGING] =	"Charging",

	[POWER_SUPPLY_STATUS_DISCHARGING] =	"Discharging",

};



static void palmtx_bat_update(struct power_supply *bat_ps)

{

	int old_status = bat_status;



	mutex_lock(&work_lock);



	bat_status = gpio_get_value(GPIO_NR_PALMTX_POWER_DETECT) ?

				    POWER_SUPPLY_STATUS_CHARGING :

				    POWER_SUPPLY_STATUS_DISCHARGING;



	if (old_status != bat_status) {

		pr_debug("%s %s -> %s\n", bat_ps->name,

				status_text[old_status],

				status_text[bat_status]);

		power_supply_changed(bat_ps);

	}



	mutex_unlock(&work_lock);

}



static enum power_supply_property palmtx_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,

};



struct power_supply bat_ps = {

	.name			= "main-battery",

	.type			= POWER_SUPPLY_TYPE_BATTERY,

	.properties		= palmtx_bat_main_props,

	.num_properties		= ARRAY_SIZE(palmtx_bat_main_props),

	.get_property		= palmtx_bat_get_property,

	.external_power_changed = palmtx_bat_external_power_changed,

	.use_for_apm		= 1,

};



static void palmtx_bat_work(struct work_struct *work)

{

	palmtx_bat_update(&bat_ps);

}



#ifdef CONFIG_PM

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

{

	flush_scheduled_work();

	return 0;

}



static int palmtx_bat_resume(struct platform_device *dev)

{

	schedule_work(&bat_work);

	return 0;

}

#else

#define palmtx_bat_suspend NULL

#define palmtx_bat_resume NULL

#endif



static int __devinit palmtx_bat_probe(struct platform_device *dev)

{

	int ret = 0;



	if (!machine_is_palmtx())

		return -ENODEV;



	mutex_init(&work_lock);



	INIT_WORK(&bat_work, palmtx_bat_work);



	ret = power_supply_register(&dev->dev, &bat_ps);

	if (!ret)

		schedule_work(&bat_work);



	return ret;

}



static int __devexit palmtx_bat_remove(struct platform_device *dev)

{

	power_supply_unregister(&bat_ps);

	return 0;

}



static struct platform_driver palmtx_bat_driver = {

	.driver.name	= "wm97xx-battery",

	.driver.owner	= THIS_MODULE,

	.probe		= palmtx_bat_probe,

	.remove		= __devexit_p(palmtx_bat_remove),

	.suspend	= palmtx_bat_suspend,

	.resume		= palmtx_bat_resume,

};



static int __init palmtx_bat_init(void)

{

	return platform_driver_register(&palmtx_bat_driver);

}



static void __exit palmtx_bat_exit(void)

{

	platform_driver_unregister(&palmtx_bat_driver);

}



module_init(palmtx_bat_init);

module_exit(palmtx_bat_exit);



MODULE_LICENSE("GPL");

MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");

MODULE_DESCRIPTION("Palm T|X battery driver");