[BATTERY] One Laptop Per Child power/battery driver (fb972873) · Commits · e / devices / android_kernel_sony_msm8994

drivers/power/Kconfig

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Original line number	Diff line number	Diff line
		@@ -42,4 +42,10 @@ config BATTERY_PMU
		Say Y here to expose battery information on Apple machines
		through the generic battery class.

		config BATTERY_OLPC
		tristate "One Laptop Per Child battery"
		depends on X86_32 && OLPC
		help
		Say Y to enable support for the battery on the OLPC laptop.

		endif # POWER_SUPPLY

drivers/power/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -19,3 +19,4 @@ 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

drivers/power/olpc_battery.c

0 → 100644

+352 −0

Original line number	Diff line number	Diff line
		/*
		* Battery driver for One Laptop Per Child board.
		*
		* Copyright © 2006 David Woodhouse <dwmw2@infradead.org>
		*
		* 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/module.h>
		#include <linux/err.h>
		#include <linux/platform_device.h>
		#include <linux/power_supply.h>
		#include <linux/jiffies.h>
		#include <linux/sched.h>
		#include <asm/olpc.h>


		#define EC_BAT_VOLTAGE 0x10 /* uint16_t, 9.76/32, mV /
		#define EC_BAT_CURRENT 0x11 /* int16_t, 15.625/120, mA /
		#define EC_BAT_ACR 0x12
		#define EC_BAT_TEMP 0x13 /* uint16_t, 100/256, °C /
		#define EC_AMB_TEMP 0x14 /* uint16_t, 100/256, °C /
		#define EC_BAT_STATUS 0x15 /* uint8_t, bitmask */
		#define EC_BAT_SOC 0x16 /* uint8_t, percentage */
		#define EC_BAT_SERIAL 0x17 /* uint8_t[6] */
		#define EC_BAT_EEPROM 0x18 /* uint8_t adr as input, uint8_t output */
		#define EC_BAT_ERRCODE 0x1f /* uint8_t, bitmask */

		#define BAT_STAT_PRESENT 0x01
		#define BAT_STAT_FULL 0x02
		#define BAT_STAT_LOW 0x04
		#define BAT_STAT_DESTROY 0x08
		#define BAT_STAT_AC 0x10
		#define BAT_STAT_CHARGING 0x20
		#define BAT_STAT_DISCHARGING 0x40

		#define BAT_ERR_INFOFAIL 0x02
		#define BAT_ERR_OVERVOLTAGE 0x04
		#define BAT_ERR_OVERTEMP 0x05
		#define BAT_ERR_GAUGESTOP 0x06
		#define BAT_ERR_OUT_OF_CONTROL 0x07
		#define BAT_ERR_ID_FAIL 0x09
		#define BAT_ERR_ACR_FAIL 0x10

		#define BAT_ADDR_MFR_TYPE 0x5F

		/*********************************************************************
		* Power
		*********************************************************************/

		static int olpc_ac_get_prop(struct power_supply *psy,
		enum power_supply_property psp,
		union power_supply_propval *val)
		{
		int ret = 0;
		uint8_t status;

		switch (psp) {
		case POWER_SUPPLY_PROP_ONLINE:
		ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &status, 1);
		if (ret)
		return ret;

		val->intval = !!(status & BAT_STAT_AC);
		break;
		default:
		ret = -EINVAL;
		break;
		}
		return ret;
		}

		static enum power_supply_property olpc_ac_props[] = {
		POWER_SUPPLY_PROP_ONLINE,
		};

		static struct power_supply olpc_ac = {
		.name = "olpc-ac",
		.type = POWER_SUPPLY_TYPE_MAINS,
		.properties = olpc_ac_props,
		.num_properties = ARRAY_SIZE(olpc_ac_props),
		.get_property = olpc_ac_get_prop,
		};

		/*********************************************************************
		* Battery properties
		*********************************************************************/
		static int olpc_bat_get_property(struct power_supply *psy,
		enum power_supply_property psp,
		union power_supply_propval *val)
		{
		int ret = 0;
		int16_t ec_word;
		uint8_t ec_byte;

		ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &ec_byte, 1);
		if (ret)
		return ret;

		/* Theoretically there's a race here -- the battery could be
		removed immediately after we check whether it's present, and
		then we query for some other property of the now-absent battery.
		It doesn't matter though -- the EC will return the last-known
		information, and it's as if we just ran that _little_ bit faster
		and managed to read it out before the battery went away. */
		if (!(ec_byte & BAT_STAT_PRESENT) && psp != POWER_SUPPLY_PROP_PRESENT)
		return -ENODEV;

		switch (psp) {
		case POWER_SUPPLY_PROP_STATUS:
		if (olpc_platform_info.ecver > 0x44) {
		if (ec_byte & BAT_STAT_CHARGING)
		val->intval = POWER_SUPPLY_STATUS_CHARGING;
		else if (ec_byte & BAT_STAT_DISCHARGING)
		val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
		else if (ec_byte & BAT_STAT_FULL)
		val->intval = POWER_SUPPLY_STATUS_FULL;
		else /* er,... */
		val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
		} else {
		/* Older EC didn't report charge/discharge bits */
		if (!(ec_byte & BAT_STAT_AC)) /* No AC means discharging */
		val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
		else if (ec_byte & BAT_STAT_FULL)
		val->intval = POWER_SUPPLY_STATUS_FULL;
		else /* Not _necessarily_ true but EC doesn't tell all yet */
		val->intval = POWER_SUPPLY_STATUS_CHARGING;
		break;
		}
		case POWER_SUPPLY_PROP_PRESENT:
		val->intval = !!(ec_byte & BAT_STAT_PRESENT);
		break;

		case POWER_SUPPLY_PROP_HEALTH:
		if (ec_byte & BAT_STAT_DESTROY)
		val->intval = POWER_SUPPLY_HEALTH_DEAD;
		else {
		ret = olpc_ec_cmd(EC_BAT_ERRCODE, NULL, 0, &ec_byte, 1);
		if (ret)
		return ret;

		switch (ec_byte) {
		case 0:
		val->intval = POWER_SUPPLY_HEALTH_GOOD;
		break;

		case BAT_ERR_OVERTEMP:
		val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
		break;

		case BAT_ERR_OVERVOLTAGE:
		val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
		break;

		case BAT_ERR_INFOFAIL:
		case BAT_ERR_OUT_OF_CONTROL:
		case BAT_ERR_ID_FAIL:
		case BAT_ERR_ACR_FAIL:
		val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
		break;

		default:
		/* Eep. We don't know this failure code */
		return -EIO;
		}
		}
		break;

		case POWER_SUPPLY_PROP_MANUFACTURER:
		ec_byte = BAT_ADDR_MFR_TYPE;
		ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1);
		if (ret)
		return ret;

		switch (ec_byte >> 4) {
		case 1:
		val->strval = "Gold Peak";
		break;
		case 2:
		val->strval = "BYD";
		break;
		default:
		val->strval = "Unknown";
		break;
		}
		break;
		case POWER_SUPPLY_PROP_TECHNOLOGY:
		ec_byte = BAT_ADDR_MFR_TYPE;
		ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1);
		if (ret)
		return ret;

		switch (ec_byte & 0xf) {
		case 1:
		val->intval = POWER_SUPPLY_TECHNOLOGY_NiMH;
		break;
		case 2:
		val->intval = POWER_SUPPLY_TECHNOLOGY_LiFe;
		break;
		default:
		val->intval = POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
		break;
		}
		break;
		case POWER_SUPPLY_PROP_VOLTAGE_AVG:
		ret = olpc_ec_cmd(EC_BAT_VOLTAGE, NULL, 0, (void *)&ec_word, 2);
		if (ret)
		return ret;

		ec_word = be16_to_cpu(ec_word);
		val->intval = ec_word * 9760L / 32;
		break;
		case POWER_SUPPLY_PROP_CURRENT_AVG:
		ret = olpc_ec_cmd(EC_BAT_CURRENT, NULL, 0, (void *)&ec_word, 2);
		if (ret)
		return ret;

		ec_word = be16_to_cpu(ec_word);
		val->intval = ec_word * 15625L / 120;
		break;
		case POWER_SUPPLY_PROP_CAPACITY:
		ret = olpc_ec_cmd(EC_BAT_SOC, NULL, 0, &ec_byte, 1);
		if (ret)
		return ret;
		val->intval = ec_byte;
		break;
		case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
		if (ec_byte & BAT_STAT_FULL)
		val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
		else if (ec_byte & BAT_STAT_LOW)
		val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
		else
		val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
		break;
		case POWER_SUPPLY_PROP_TEMP:
		ret = olpc_ec_cmd(EC_BAT_TEMP, NULL, 0, (void *)&ec_word, 2);
		if (ret)
		return ret;
		ec_word = be16_to_cpu(ec_word);
		val->intval = ec_word * 100 / 256;
		break;
		case POWER_SUPPLY_PROP_TEMP_AMBIENT:
		ret = olpc_ec_cmd(EC_AMB_TEMP, NULL, 0, (void *)&ec_word, 2);
		if (ret)
		return ret;

		ec_word = be16_to_cpu(ec_word);
		val->intval = ec_word * 100 / 256;
		break;
		default:
		ret = -EINVAL;
		break;
		}

		return ret;
		}

		static enum power_supply_property olpc_bat_props[] = {
		POWER_SUPPLY_PROP_STATUS,
		POWER_SUPPLY_PROP_PRESENT,
		POWER_SUPPLY_PROP_HEALTH,
		POWER_SUPPLY_PROP_TECHNOLOGY,
		POWER_SUPPLY_PROP_VOLTAGE_AVG,
		POWER_SUPPLY_PROP_CURRENT_AVG,
		POWER_SUPPLY_PROP_CAPACITY,
		POWER_SUPPLY_PROP_CAPACITY_LEVEL,
		POWER_SUPPLY_PROP_TEMP,
		POWER_SUPPLY_PROP_TEMP_AMBIENT,
		POWER_SUPPLY_PROP_MANUFACTURER,
		};

		/*********************************************************************
		* Initialisation
		*********************************************************************/

		static struct platform_device *bat_pdev;

		static struct power_supply olpc_bat = {
		.properties = olpc_bat_props,
		.num_properties = ARRAY_SIZE(olpc_bat_props),
		.get_property = olpc_bat_get_property,
		.use_for_apm = 1,
		};

		void olpc_battery_trigger_uevent(unsigned long cause)
		{
		if (cause & EC_SCI_SRC_ACPWR)
		kobject_uevent(&olpc_ac.dev->kobj, KOBJ_CHANGE);
		if (cause & (EC_SCI_SRC_BATERR\|EC_SCI_SRC_BATSOC\|EC_SCI_SRC_BATTERY))
		kobject_uevent(&olpc_bat.dev->kobj, KOBJ_CHANGE);
		}

		static int __init olpc_bat_init(void)
		{
		int ret = 0;
		uint8_t status;

		if (!olpc_platform_info.ecver)
		return -ENXIO;
		if (olpc_platform_info.ecver < 0x43) {
		printk(KERN_NOTICE "OLPC EC version 0x%02x too old for battery driver.\n", olpc_platform_info.ecver);
		return -ENXIO;
		}

		ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &status, 1);
		if (ret)
		return ret;

		/* Ignore the status. It doesn't actually matter */

		bat_pdev = platform_device_register_simple("olpc-battery", 0, NULL, 0);
		if (IS_ERR(bat_pdev))
		return PTR_ERR(bat_pdev);

		ret = power_supply_register(&bat_pdev->dev, &olpc_ac);
		if (ret)
		goto ac_failed;

		olpc_bat.name = bat_pdev->name;

		ret = power_supply_register(&bat_pdev->dev, &olpc_bat);
		if (ret)
		goto battery_failed;

		olpc_register_battery_callback(&olpc_battery_trigger_uevent);
		goto success;

		battery_failed:
		power_supply_unregister(&olpc_ac);
		ac_failed:
		platform_device_unregister(bat_pdev);
		success:
		return ret;
		}

		static void __exit olpc_bat_exit(void)
		{
		olpc_deregister_battery_callback();
		power_supply_unregister(&olpc_bat);
		power_supply_unregister(&olpc_ac);
		platform_device_unregister(bat_pdev);
		return;
		}

		module_init(olpc_bat_init);
		module_exit(olpc_bat_exit);

		MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
		MODULE_LICENSE("GPL");
		MODULE_DESCRIPTION("Battery driver for One Laptop Per Child 'XO' machine");