[deliverable/linux.git] / drivers / power / olpc_battery.c

/*
 * Battery driver for One Laptop Per Child board.
 *
 *	Copyright © 2006-2010  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/kernel.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/err.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/jiffies.h>
#include <linux/sched.h>
#include <linux/olpc-ec.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	/* int16_t,	*6250/15,    µAh  */
#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_STAT_TRICKLE	0x80

#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,
};

static char bat_serial[17]; /* Ick */

static int olpc_bat_get_status(union power_supply_propval *val, uint8_t ec_byte)
{
	if (olpc_platform_info.ecver > 0x44) {
		if (ec_byte & (BAT_STAT_CHARGING | BAT_STAT_TRICKLE))
			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;
	}

	return 0;
}

static int olpc_bat_get_health(union power_supply_propval *val)
{
	uint8_t ec_byte;
	int ret;

	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 */
		ret = -EIO;
	}

	return ret;
}

static int olpc_bat_get_mfr(union power_supply_propval *val)
{
	uint8_t ec_byte;
	int ret;

	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;
	}

	return ret;
}

static int olpc_bat_get_tech(union power_supply_propval *val)
{
	uint8_t ec_byte;
	int ret;

	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;
	}

	return ret;
}

static int olpc_bat_get_charge_full_design(union power_supply_propval *val)
{
	uint8_t ec_byte;
	union power_supply_propval tech;
	int ret, mfr;

	ret = olpc_bat_get_tech(&tech);
	if (ret)
		return ret;

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

	mfr = ec_byte >> 4;

	switch (tech.intval) {
	case POWER_SUPPLY_TECHNOLOGY_NiMH:
		switch (mfr) {
		case 1: /* Gold Peak */
			val->intval = 3000000*.8;
			break;
		default:
			return -EIO;
		}
		break;

	case POWER_SUPPLY_TECHNOLOGY_LiFe:
		switch (mfr) {
		case 1: /* Gold Peak, fall through */
		case 2: /* BYD */
			val->intval = 2800000;
			break;
		default:
			return -EIO;
		}
		break;

	default:
		return -EIO;
	}

	return ret;
}

static int olpc_bat_get_charge_now(union power_supply_propval *val)
{
	uint8_t soc;
	union power_supply_propval full;
	int ret;

	ret = olpc_ec_cmd(EC_BAT_SOC, NULL, 0, &soc, 1);
	if (ret)
		return ret;

	ret = olpc_bat_get_charge_full_design(&full);
	if (ret)
		return ret;

	val->intval = soc * (full.intval / 100);
	return 0;
}

static int olpc_bat_get_voltage_max_design(union power_supply_propval *val)
{
	uint8_t ec_byte;
	union power_supply_propval tech;
	int mfr;
	int ret;

	ret = olpc_bat_get_tech(&tech);
	if (ret)
		return ret;

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

	mfr = ec_byte >> 4;

	switch (tech.intval) {
	case POWER_SUPPLY_TECHNOLOGY_NiMH:
		switch (mfr) {
		case 1: /* Gold Peak */
			val->intval = 6000000;
			break;
		default:
			return -EIO;
		}
		break;

	case POWER_SUPPLY_TECHNOLOGY_LiFe:
		switch (mfr) {
		case 1: /* Gold Peak */
			val->intval = 6400000;
			break;
		case 2: /* BYD */
			val->intval = 6500000;
			break;
		default:
			return -EIO;
		}
		break;

	default:
		return -EIO;
	}

	return ret;
}

/*********************************************************************
 *		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;
	__be16 ec_word;
	uint8_t ec_byte;
	__be64 ser_buf;

	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 | BAT_STAT_TRICKLE)) &&
			psp != POWER_SUPPLY_PROP_PRESENT)
		return -ENODEV;

	switch (psp) {
	case POWER_SUPPLY_PROP_STATUS:
		ret = olpc_bat_get_status(val, ec_byte);
		if (ret)
			return ret;
		break;
	case POWER_SUPPLY_PROP_CHARGE_TYPE:
		if (ec_byte & BAT_STAT_TRICKLE)
			val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
		else if (ec_byte & BAT_STAT_CHARGING)
			val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;
		else
			val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
		break;
	case POWER_SUPPLY_PROP_PRESENT:
		val->intval = !!(ec_byte & (BAT_STAT_PRESENT |
					    BAT_STAT_TRICKLE));
		break;

	case POWER_SUPPLY_PROP_HEALTH:
		if (ec_byte & BAT_STAT_DESTROY)
			val->intval = POWER_SUPPLY_HEALTH_DEAD;
		else {
			ret = olpc_bat_get_health(val);
			if (ret)
				return ret;
		}
		break;

	case POWER_SUPPLY_PROP_MANUFACTURER:
		ret = olpc_bat_get_mfr(val);
		if (ret)
			return ret;
		break;
	case POWER_SUPPLY_PROP_TECHNOLOGY:
		ret = olpc_bat_get_tech(val);
		if (ret)
			return ret;
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_AVG:
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
		ret = olpc_ec_cmd(EC_BAT_VOLTAGE, NULL, 0, (void *)&ec_word, 2);
		if (ret)
			return ret;

		val->intval = (s16)be16_to_cpu(ec_word) * 9760L / 32;
		break;
	case POWER_SUPPLY_PROP_CURRENT_AVG:
	case POWER_SUPPLY_PROP_CURRENT_NOW:
		ret = olpc_ec_cmd(EC_BAT_CURRENT, NULL, 0, (void *)&ec_word, 2);
		if (ret)
			return ret;

		val->intval = (s16)be16_to_cpu(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_CHARGE_FULL_DESIGN:
		ret = olpc_bat_get_charge_full_design(val);
		if (ret)
			return ret;
		break;
	case POWER_SUPPLY_PROP_CHARGE_NOW:
		ret = olpc_bat_get_charge_now(val);
		if (ret)
			return ret;
		break;
	case POWER_SUPPLY_PROP_TEMP:
		ret = olpc_ec_cmd(EC_BAT_TEMP, NULL, 0, (void *)&ec_word, 2);
		if (ret)
			return ret;

		val->intval = (s16)be16_to_cpu(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;

		val->intval = (int)be16_to_cpu(ec_word) * 100 / 256;
		break;
	case POWER_SUPPLY_PROP_CHARGE_COUNTER:
		ret = olpc_ec_cmd(EC_BAT_ACR, NULL, 0, (void *)&ec_word, 2);
		if (ret)
			return ret;

		val->intval = (s16)be16_to_cpu(ec_word) * 6250 / 15;
		break;
	case POWER_SUPPLY_PROP_SERIAL_NUMBER:
		ret = olpc_ec_cmd(EC_BAT_SERIAL, NULL, 0, (void *)&ser_buf, 8);
		if (ret)
			return ret;

		sprintf(bat_serial, "%016llx", (long long)be64_to_cpu(ser_buf));
		val->strval = bat_serial;
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
		ret = olpc_bat_get_voltage_max_design(val);
		if (ret)
			return ret;
		break;
	default:
		ret = -EINVAL;
		break;
	}

	return ret;
}

static enum power_supply_property olpc_xo1_bat_props[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_CHARGE_TYPE,
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_HEALTH,
	POWER_SUPPLY_PROP_TECHNOLOGY,
	POWER_SUPPLY_PROP_VOLTAGE_AVG,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_CURRENT_AVG,
	POWER_SUPPLY_PROP_CURRENT_NOW,
	POWER_SUPPLY_PROP_CAPACITY,
	POWER_SUPPLY_PROP_CAPACITY_LEVEL,
	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
	POWER_SUPPLY_PROP_CHARGE_NOW,
	POWER_SUPPLY_PROP_TEMP,
	POWER_SUPPLY_PROP_TEMP_AMBIENT,
	POWER_SUPPLY_PROP_MANUFACTURER,
	POWER_SUPPLY_PROP_SERIAL_NUMBER,
	POWER_SUPPLY_PROP_CHARGE_COUNTER,
	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
};

/* XO-1.5 does not have ambient temperature property */
static enum power_supply_property olpc_xo15_bat_props[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_CHARGE_TYPE,
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_HEALTH,
	POWER_SUPPLY_PROP_TECHNOLOGY,
	POWER_SUPPLY_PROP_VOLTAGE_AVG,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_CURRENT_AVG,
	POWER_SUPPLY_PROP_CURRENT_NOW,
	POWER_SUPPLY_PROP_CAPACITY,
	POWER_SUPPLY_PROP_CAPACITY_LEVEL,
	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
	POWER_SUPPLY_PROP_CHARGE_NOW,
	POWER_SUPPLY_PROP_TEMP,
	POWER_SUPPLY_PROP_MANUFACTURER,
	POWER_SUPPLY_PROP_SERIAL_NUMBER,
	POWER_SUPPLY_PROP_CHARGE_COUNTER,
	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
};

/* EEPROM reading goes completely around the power_supply API, sadly */

#define EEPROM_START	0x20
#define EEPROM_END	0x80
#define EEPROM_SIZE	(EEPROM_END - EEPROM_START)

static ssize_t olpc_bat_eeprom_read(struct file *filp, struct kobject *kobj,
		struct bin_attribute *attr, char *buf, loff_t off, size_t count)
{
	uint8_t ec_byte;
	int ret;
	int i;

	if (off >= EEPROM_SIZE)
		return 0;
	if (off + count > EEPROM_SIZE)
		count = EEPROM_SIZE - off;

	for (i = 0; i < count; i++) {
		ec_byte = EEPROM_START + off + i;
		ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &buf[i], 1);
		if (ret) {
			pr_err("olpc-battery: "
			       "EC_BAT_EEPROM cmd @ 0x%x failed - %d!\n",
			       ec_byte, ret);
			return -EIO;
		}
	}

	return count;
}

static struct bin_attribute olpc_bat_eeprom = {
	.attr = {
		.name = "eeprom",
		.mode = S_IRUGO,
	},
	.size = 0,
	.read = olpc_bat_eeprom_read,
};

/* Allow userspace to see the specific error value pulled from the EC */

static ssize_t olpc_bat_error_read(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	uint8_t ec_byte;
	ssize_t ret;

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

	return sprintf(buf, "%d\n", ec_byte);
}

static struct device_attribute olpc_bat_error = {
	.attr = {
		.name = "error",
		.mode = S_IRUGO,
	},
	.show = olpc_bat_error_read,
};

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

static struct power_supply olpc_bat = {
	.name = "olpc-battery",
	.get_property = olpc_bat_get_property,
	.use_for_apm = 1,
};

static int olpc_battery_suspend(struct platform_device *pdev,
				pm_message_t state)
{
	if (device_may_wakeup(olpc_ac.dev))
		olpc_ec_wakeup_set(EC_SCI_SRC_ACPWR);
	else
		olpc_ec_wakeup_clear(EC_SCI_SRC_ACPWR);

	if (device_may_wakeup(olpc_bat.dev))
		olpc_ec_wakeup_set(EC_SCI_SRC_BATTERY | EC_SCI_SRC_BATSOC
				   | EC_SCI_SRC_BATERR);
	else
		olpc_ec_wakeup_clear(EC_SCI_SRC_BATTERY | EC_SCI_SRC_BATSOC
				     | EC_SCI_SRC_BATERR);

	return 0;
}

static int olpc_battery_probe(struct platform_device *pdev)
{
	int ret;
	uint8_t status;

	/*
	 * We've seen a number of EC protocol changes; this driver requires
	 * the latest EC protocol, supported by 0x44 and above.
	 */
	if (olpc_platform_info.ecver < 0x44) {
		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 */

	ret = power_supply_register(&pdev->dev, &olpc_ac);
	if (ret)
		return ret;

	if (olpc_board_at_least(olpc_board_pre(0xd0))) { /* XO-1.5 */
		olpc_bat.properties = olpc_xo15_bat_props;
		olpc_bat.num_properties = ARRAY_SIZE(olpc_xo15_bat_props);
	} else { /* XO-1 */
		olpc_bat.properties = olpc_xo1_bat_props;
		olpc_bat.num_properties = ARRAY_SIZE(olpc_xo1_bat_props);
	}

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

	ret = device_create_bin_file(olpc_bat.dev, &olpc_bat_eeprom);
	if (ret)
		goto eeprom_failed;

	ret = device_create_file(olpc_bat.dev, &olpc_bat_error);
	if (ret)
		goto error_failed;

	if (olpc_ec_wakeup_available()) {
		device_set_wakeup_capable(olpc_ac.dev, true);
		device_set_wakeup_capable(olpc_bat.dev, true);
	}

	return 0;

error_failed:
	device_remove_bin_file(olpc_bat.dev, &olpc_bat_eeprom);
eeprom_failed:
	power_supply_unregister(&olpc_bat);
battery_failed:
	power_supply_unregister(&olpc_ac);
	return ret;
}

static int olpc_battery_remove(struct platform_device *pdev)
{
	device_remove_file(olpc_bat.dev, &olpc_bat_error);
	device_remove_bin_file(olpc_bat.dev, &olpc_bat_eeprom);
	power_supply_unregister(&olpc_bat);
	power_supply_unregister(&olpc_ac);
	return 0;
}

static const struct of_device_id olpc_battery_ids[] = {
	{ .compatible = "olpc,xo1-battery" },
	{}
};
MODULE_DEVICE_TABLE(of, olpc_battery_ids);

static struct platform_driver olpc_battery_driver = {
	.driver = {
		.name = "olpc-battery",
		.owner = THIS_MODULE,
		.of_match_table = olpc_battery_ids,
	},
	.probe = olpc_battery_probe,
	.remove = olpc_battery_remove,
	.suspend = olpc_battery_suspend,
};

module_platform_driver(olpc_battery_driver);

MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Battery driver for One Laptop Per Child 'XO' machine");
Commit	Line	Data
fb972873 DW	1	/*
	2	* Battery driver for One Laptop Per Child board.
	3	*
690e85a3	4	* Copyright © 2006-2010 David Woodhouse <dwmw2@infradead.org>
fb972873 DW	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*/
	10
04a820ea	11	#include <linux/kernel.h>
fb972873	12	#include <linux/module.h>
144bbeae	13	#include <linux/types.h>
fb972873	14	#include <linux/err.h>
144bbeae	15	#include <linux/device.h>
fb972873 DW	16	#include <linux/platform_device.h>
	17	#include <linux/power_supply.h>
	18	#include <linux/jiffies.h>
	19	#include <linux/sched.h>
3bf9428f	20	#include <linux/olpc-ec.h>
fb972873 DW	21	#include <asm/olpc.h>
	22
	23
	24	#define EC_BAT_VOLTAGE 0x10 /* uint16_t, 9.76/32, mV /
	25	#define EC_BAT_CURRENT 0x11 /* int16_t, 15.625/120, mA /
75d88079	26	#define EC_BAT_ACR 0x12 /* int16_t, 6250/15, µAh /
fb972873 DW	27	#define EC_BAT_TEMP 0x13 /* uint16_t, 100/256, °C /
	28	#define EC_AMB_TEMP 0x14 /* uint16_t, 100/256, °C /
	29	#define EC_BAT_STATUS 0x15 /* uint8_t, bitmask */
	30	#define EC_BAT_SOC 0x16 /* uint8_t, percentage */
	31	#define EC_BAT_SERIAL 0x17 /* uint8_t[6] */
	32	#define EC_BAT_EEPROM 0x18 /* uint8_t adr as input, uint8_t output */
	33	#define EC_BAT_ERRCODE 0x1f /* uint8_t, bitmask */
	34
	35	#define BAT_STAT_PRESENT 0x01
	36	#define BAT_STAT_FULL 0x02
	37	#define BAT_STAT_LOW 0x04
	38	#define BAT_STAT_DESTROY 0x08
	39	#define BAT_STAT_AC 0x10
	40	#define BAT_STAT_CHARGING 0x20
	41	#define BAT_STAT_DISCHARGING 0x40
8f7e5798	42	#define BAT_STAT_TRICKLE 0x80
fb972873 DW	43
	44	#define BAT_ERR_INFOFAIL 0x02
	45	#define BAT_ERR_OVERVOLTAGE 0x04
	46	#define BAT_ERR_OVERTEMP 0x05
	47	#define BAT_ERR_GAUGESTOP 0x06
	48	#define BAT_ERR_OUT_OF_CONTROL 0x07
	49	#define BAT_ERR_ID_FAIL 0x09
	50	#define BAT_ERR_ACR_FAIL 0x10
	51
	52	#define BAT_ADDR_MFR_TYPE 0x5F
	53
	54	/*********************************************************************
	55	* Power
	56	*********************************************************************/
	57
	58	static int olpc_ac_get_prop(struct power_supply *psy,
	59	enum power_supply_property psp,
	60	union power_supply_propval *val)
	61	{
	62	int ret = 0;
	63	uint8_t status;
	64
	65	switch (psp) {
	66	case POWER_SUPPLY_PROP_ONLINE:
	67	ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &status, 1);
	68	if (ret)
	69	return ret;
	70
	71	val->intval = !!(status & BAT_STAT_AC);
	72	break;
	73	default:
	74	ret = -EINVAL;
	75	break;
	76	}
	77	return ret;
	78	}
	79
	80	static enum power_supply_property olpc_ac_props[] = {
	81	POWER_SUPPLY_PROP_ONLINE,
	82	};
	83
	84	static struct power_supply olpc_ac = {
	85	.name = "olpc-ac",
	86	.type = POWER_SUPPLY_TYPE_MAINS,
	87	.properties = olpc_ac_props,
	88	.num_properties = ARRAY_SIZE(olpc_ac_props),
	89	.get_property = olpc_ac_get_prop,
	90	};
	91
1ca5b9d2 DW	92	static char bat_serial[17]; /* Ick */
1ca5b9d2 DW	93
b2bd8a3b AS	94	static int olpc_bat_get_status(union power_supply_propval *val, uint8_t ec_byte)
	95	{
	96	if (olpc_platform_info.ecver > 0x44) {
8f7e5798	97	if (ec_byte & (BAT_STAT_CHARGING \| BAT_STAT_TRICKLE))
b2bd8a3b AS	98	val->intval = POWER_SUPPLY_STATUS_CHARGING;
	99	else if (ec_byte & BAT_STAT_DISCHARGING)
	100	val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
	101	else if (ec_byte & BAT_STAT_FULL)
	102	val->intval = POWER_SUPPLY_STATUS_FULL;
	103	else /* er,... */
	104	val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
	105	} else {
	106	/* Older EC didn't report charge/discharge bits */
	107	if (!(ec_byte & BAT_STAT_AC)) /* No AC means discharging */
	108	val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
	109	else if (ec_byte & BAT_STAT_FULL)
	110	val->intval = POWER_SUPPLY_STATUS_FULL;
	111	else /* Not _necessarily_ true but EC doesn't tell all yet */
	112	val->intval = POWER_SUPPLY_STATUS_CHARGING;
	113	}
	114
	115	return 0;
	116	}
	117
	118	static int olpc_bat_get_health(union power_supply_propval *val)
	119	{
	120	uint8_t ec_byte;
	121	int ret;
	122
	123	ret = olpc_ec_cmd(EC_BAT_ERRCODE, NULL, 0, &ec_byte, 1);
	124	if (ret)
	125	return ret;
	126
	127	switch (ec_byte) {
	128	case 0:
	129	val->intval = POWER_SUPPLY_HEALTH_GOOD;
	130	break;
	131
	132	case BAT_ERR_OVERTEMP:
	133	val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
	134	break;
	135
	136	case BAT_ERR_OVERVOLTAGE:
	137	val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
	138	break;
	139
	140	case BAT_ERR_INFOFAIL:
	141	case BAT_ERR_OUT_OF_CONTROL:
	142	case BAT_ERR_ID_FAIL:
	143	case BAT_ERR_ACR_FAIL:
	144	val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
	145	break;
	146
	147	default:
	148	/* Eep. We don't know this failure code */
	149	ret = -EIO;
	150	}
	151
	152	return ret;
	153	}
	154
	155	static int olpc_bat_get_mfr(union power_supply_propval *val)
	156	{
	157	uint8_t ec_byte;
	158	int ret;
	159
	160	ec_byte = BAT_ADDR_MFR_TYPE;
	161	ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1);
162	if (ret)
163	return ret;
164
165	switch (ec_byte >> 4) {
166	case 1:
167	val->strval = "Gold Peak";
168	break;
169	case 2:
170	val->strval = "BYD";
171	break;
172	default:
173	val->strval = "Unknown";
174	break;
175	}
176
177	return ret;
178	}
179
180	static int olpc_bat_get_tech(union power_supply_propval *val)
181	{
182	uint8_t ec_byte;
183	int ret;
184
185	ec_byte = BAT_ADDR_MFR_TYPE;
186	ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1);
187	if (ret)
188	return ret;
189
190	switch (ec_byte & 0xf) {
191	case 1:
192	val->intval = POWER_SUPPLY_TECHNOLOGY_NiMH;
193	break;
194	case 2:
195	val->intval = POWER_SUPPLY_TECHNOLOGY_LiFe;
196	break;
197	default:
198	val->intval = POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
199	break;
200	}
201
202	return ret;
203	}
204
b202a5e6 SS	205	static int olpc_bat_get_charge_full_design(union power_supply_propval *val)
	206	{
	207	uint8_t ec_byte;
	208	union power_supply_propval tech;
	209	int ret, mfr;
	210
	211	ret = olpc_bat_get_tech(&tech);
	212	if (ret)
	213	return ret;
	214
	215	ec_byte = BAT_ADDR_MFR_TYPE;
	216	ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1);
	217	if (ret)
	218	return ret;
	219
	220	mfr = ec_byte >> 4;
	221
	222	switch (tech.intval) {
	223	case POWER_SUPPLY_TECHNOLOGY_NiMH:
	224	switch (mfr) {
	225	case 1: /* Gold Peak */
	226	val->intval = 3000000*.8;
	227	break;
	228	default:
	229	return -EIO;
	230	}
	231	break;
	232
	233	case POWER_SUPPLY_TECHNOLOGY_LiFe:
	234	switch (mfr) {
ecc2edd5	235	case 1: /* Gold Peak, fall through */
b202a5e6	236	case 2: /* BYD */
ecc2edd5	237	val->intval = 2800000;
b202a5e6 SS	238	break;
	239	default:
	240	return -EIO;
	241	}
	242	break;
	243
	244	default:
	245	return -EIO;
	246	}
	247
	248	return ret;
	249	}
	250
20fd9830 SS	251	static int olpc_bat_get_charge_now(union power_supply_propval *val)
	252	{
	253	uint8_t soc;
	254	union power_supply_propval full;
	255	int ret;
	256
	257	ret = olpc_ec_cmd(EC_BAT_SOC, NULL, 0, &soc, 1);
	258	if (ret)
	259	return ret;
	260
	261	ret = olpc_bat_get_charge_full_design(&full);
	262	if (ret)
	263	return ret;
	264
	265	val->intval = soc * (full.intval / 100);
	266	return 0;
	267	}
	268
5619d0ba RS	269	static int olpc_bat_get_voltage_max_design(union power_supply_propval *val)
	270	{
	271	uint8_t ec_byte;
	272	union power_supply_propval tech;
	273	int mfr;
	274	int ret;
	275
	276	ret = olpc_bat_get_tech(&tech);
	277	if (ret)
	278	return ret;
	279
	280	ec_byte = BAT_ADDR_MFR_TYPE;
	281	ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1);
	282	if (ret)
	283	return ret;
	284
	285	mfr = ec_byte >> 4;
	286
	287	switch (tech.intval) {
	288	case POWER_SUPPLY_TECHNOLOGY_NiMH:
	289	switch (mfr) {
	290	case 1: /* Gold Peak */
	291	val->intval = 6000000;
	292	break;
	293	default:
	294	return -EIO;
	295	}
	296	break;
	297
	298	case POWER_SUPPLY_TECHNOLOGY_LiFe:
	299	switch (mfr) {
	300	case 1: /* Gold Peak */
	301	val->intval = 6400000;
	302	break;
	303	case 2: /* BYD */
	304	val->intval = 6500000;
	305	break;
	306	default:
	307	return -EIO;
	308	}
	309	break;
	310
	311	default:
	312	return -EIO;
	313	}
	314
	315	return ret;
	316	}
	317
fb972873 DW	318	/*********************************************************************
	319	* Battery properties
	320	*********************************************************************/
	321	static int olpc_bat_get_property(struct power_supply *psy,
	322	enum power_supply_property psp,
	323	union power_supply_propval *val)
	324	{
	325	int ret = 0;
8e9c7716	326	__be16 ec_word;
fb972873	327	uint8_t ec_byte;
8e9c7716	328	__be64 ser_buf;
fb972873 DW	329
	330	ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &ec_byte, 1);
	331	if (ret)
	332	return ret;
	333
	334	/* Theoretically there's a race here -- the battery could be
	335	removed immediately after we check whether it's present, and
	336	then we query for some other property of the now-absent battery.
	337	It doesn't matter though -- the EC will return the last-known
	338	information, and it's as if we just ran that _little_ bit faster
	339	and managed to read it out before the battery went away. */
8f7e5798 AS	340	if (!(ec_byte & (BAT_STAT_PRESENT \| BAT_STAT_TRICKLE)) &&
8f7e5798 AS	341	psp != POWER_SUPPLY_PROP_PRESENT)
fb972873 DW	342	return -ENODEV;
	343
	344	switch (psp) {
	345	case POWER_SUPPLY_PROP_STATUS:
b2bd8a3b AS	346	ret = olpc_bat_get_status(val, ec_byte);
	347	if (ret)
	348	return ret;
	349	break;
ee8076ed AS	350	case POWER_SUPPLY_PROP_CHARGE_TYPE:
	351	if (ec_byte & BAT_STAT_TRICKLE)
	352	val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
	353	else if (ec_byte & BAT_STAT_CHARGING)
	354	val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;
	355	else
	356	val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
	357	break;
fb972873	358	case POWER_SUPPLY_PROP_PRESENT:
8f7e5798 AS	359	val->intval = !!(ec_byte & (BAT_STAT_PRESENT \|
8f7e5798 AS	360	BAT_STAT_TRICKLE));
fb972873 DW	361	break;
	362
	363	case POWER_SUPPLY_PROP_HEALTH:
	364	if (ec_byte & BAT_STAT_DESTROY)
	365	val->intval = POWER_SUPPLY_HEALTH_DEAD;
	366	else {
b2bd8a3b	367	ret = olpc_bat_get_health(val);
fb972873 DW	368	if (ret)
fb972873 DW	369	return ret;
fb972873 DW	370	}
	371	break;
	372
	373	case POWER_SUPPLY_PROP_MANUFACTURER:
b2bd8a3b	374	ret = olpc_bat_get_mfr(val);
fb972873 DW	375	if (ret)
fb972873 DW	376	return ret;
fb972873 DW	377	break;
fb972873 DW	378	case POWER_SUPPLY_PROP_TECHNOLOGY:
b2bd8a3b	379	ret = olpc_bat_get_tech(val);
fb972873 DW	380	if (ret)
fb972873 DW	381	return ret;
fb972873 DW	382	break;
fb972873 DW	383	case POWER_SUPPLY_PROP_VOLTAGE_AVG:
22fadd76	384	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
fb972873 DW	385	ret = olpc_ec_cmd(EC_BAT_VOLTAGE, NULL, 0, (void *)&ec_word, 2);
	386	if (ret)
	387	return ret;
	388
7cfbb294	389	val->intval = (s16)be16_to_cpu(ec_word) * 9760L / 32;
fb972873 DW	390	break;
fb972873 DW	391	case POWER_SUPPLY_PROP_CURRENT_AVG:
22fadd76	392	case POWER_SUPPLY_PROP_CURRENT_NOW:
fb972873 DW	393	ret = olpc_ec_cmd(EC_BAT_CURRENT, NULL, 0, (void *)&ec_word, 2);
	394	if (ret)
	395	return ret;
	396
7cfbb294	397	val->intval = (s16)be16_to_cpu(ec_word) * 15625L / 120;
fb972873 DW	398	break;
	399	case POWER_SUPPLY_PROP_CAPACITY:
	400	ret = olpc_ec_cmd(EC_BAT_SOC, NULL, 0, &ec_byte, 1);
	401	if (ret)
	402	return ret;
	403	val->intval = ec_byte;
	404	break;
b294a290 AS	405	case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
	406	if (ec_byte & BAT_STAT_FULL)
	407	val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
	408	else if (ec_byte & BAT_STAT_LOW)
	409	val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
	410	else
	411	val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
	412	break;
b202a5e6 SS	413	case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
	414	ret = olpc_bat_get_charge_full_design(val);
	415	if (ret)
	416	return ret;
	417	break;
20fd9830 SS	418	case POWER_SUPPLY_PROP_CHARGE_NOW:
	419	ret = olpc_bat_get_charge_now(val);
	420	if (ret)
	421	return ret;
	422	break;
fb972873 DW	423	case POWER_SUPPLY_PROP_TEMP:
	424	ret = olpc_ec_cmd(EC_BAT_TEMP, NULL, 0, (void *)&ec_word, 2);
	425	if (ret)
	426	return ret;
8e9c7716	427
7cfbb294	428	val->intval = (s16)be16_to_cpu(ec_word) * 100 / 256;
fb972873 DW	429	break;
	430	case POWER_SUPPLY_PROP_TEMP_AMBIENT:
	431	ret = olpc_ec_cmd(EC_AMB_TEMP, NULL, 0, (void *)&ec_word, 2);
	432	if (ret)
	433	return ret;
	434
8e9c7716	435	val->intval = (int)be16_to_cpu(ec_word) * 100 / 256;
fb972873	436	break;
8e552c36 AS	437	case POWER_SUPPLY_PROP_CHARGE_COUNTER:
	438	ret = olpc_ec_cmd(EC_BAT_ACR, NULL, 0, (void *)&ec_word, 2);
	439	if (ret)
	440	return ret;
	441
7cfbb294	442	val->intval = (s16)be16_to_cpu(ec_word) * 6250 / 15;
8e552c36	443	break;
1ca5b9d2 DW	444	case POWER_SUPPLY_PROP_SERIAL_NUMBER:
	445	ret = olpc_ec_cmd(EC_BAT_SERIAL, NULL, 0, (void *)&ser_buf, 8);
	446	if (ret)
	447	return ret;
	448
	449	sprintf(bat_serial, "%016llx", (long long)be64_to_cpu(ser_buf));
	450	val->strval = bat_serial;
	451	break;
5619d0ba RS	452	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
	453	ret = olpc_bat_get_voltage_max_design(val);
	454	if (ret)
	455	return ret;
	456	break;
fb972873 DW	457	default:
	458	ret = -EINVAL;
	459	break;
	460	}
	461
	462	return ret;
	463	}
	464
c566d299	465	static enum power_supply_property olpc_xo1_bat_props[] = {
fb972873	466	POWER_SUPPLY_PROP_STATUS,
ee8076ed	467	POWER_SUPPLY_PROP_CHARGE_TYPE,
fb972873 DW	468	POWER_SUPPLY_PROP_PRESENT,
	469	POWER_SUPPLY_PROP_HEALTH,
	470	POWER_SUPPLY_PROP_TECHNOLOGY,
	471	POWER_SUPPLY_PROP_VOLTAGE_AVG,
22fadd76	472	POWER_SUPPLY_PROP_VOLTAGE_NOW,
fb972873	473	POWER_SUPPLY_PROP_CURRENT_AVG,
22fadd76	474	POWER_SUPPLY_PROP_CURRENT_NOW,
fb972873	475	POWER_SUPPLY_PROP_CAPACITY,
b294a290	476	POWER_SUPPLY_PROP_CAPACITY_LEVEL,
b202a5e6	477	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
20fd9830	478	POWER_SUPPLY_PROP_CHARGE_NOW,
fb972873 DW	479	POWER_SUPPLY_PROP_TEMP,
	480	POWER_SUPPLY_PROP_TEMP_AMBIENT,
	481	POWER_SUPPLY_PROP_MANUFACTURER,
1ca5b9d2	482	POWER_SUPPLY_PROP_SERIAL_NUMBER,
8e552c36	483	POWER_SUPPLY_PROP_CHARGE_COUNTER,
5619d0ba	484	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
fb972873 DW	485	};
fb972873 DW	486
c566d299 DD	487	/* XO-1.5 does not have ambient temperature property */
	488	static enum power_supply_property olpc_xo15_bat_props[] = {
	489	POWER_SUPPLY_PROP_STATUS,
	490	POWER_SUPPLY_PROP_CHARGE_TYPE,
	491	POWER_SUPPLY_PROP_PRESENT,
	492	POWER_SUPPLY_PROP_HEALTH,
	493	POWER_SUPPLY_PROP_TECHNOLOGY,
	494	POWER_SUPPLY_PROP_VOLTAGE_AVG,
bf542a4e	495	POWER_SUPPLY_PROP_VOLTAGE_NOW,
c566d299	496	POWER_SUPPLY_PROP_CURRENT_AVG,
bf542a4e	497	POWER_SUPPLY_PROP_CURRENT_NOW,
c566d299 DD	498	POWER_SUPPLY_PROP_CAPACITY,
c566d299 DD	499	POWER_SUPPLY_PROP_CAPACITY_LEVEL,
bf542a4e SS	500	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
bf542a4e SS	501	POWER_SUPPLY_PROP_CHARGE_NOW,
c566d299 DD	502	POWER_SUPPLY_PROP_TEMP,
	503	POWER_SUPPLY_PROP_MANUFACTURER,
	504	POWER_SUPPLY_PROP_SERIAL_NUMBER,
	505	POWER_SUPPLY_PROP_CHARGE_COUNTER,
5619d0ba	506	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
c566d299 DD	507	};
c566d299 DD	508
d7eb9e36 AS	509	/* EEPROM reading goes completely around the power_supply API, sadly */
	510
	511	#define EEPROM_START 0x20
	512	#define EEPROM_END 0x80
	513	#define EEPROM_SIZE (EEPROM_END - EEPROM_START)
	514
2c3c8bea	515	static ssize_t olpc_bat_eeprom_read(struct file filp, struct kobject kobj,
d7eb9e36 AS	516	struct bin_attribute attr, char buf, loff_t off, size_t count)
	517	{
	518	uint8_t ec_byte;
04a820ea AS	519	int ret;
04a820ea AS	520	int i;
d7eb9e36 AS	521
	522	if (off >= EEPROM_SIZE)
	523	return 0;
	524	if (off + count > EEPROM_SIZE)
	525	count = EEPROM_SIZE - off;
	526
04a820ea AS	527	for (i = 0; i < count; i++) {
	528	ec_byte = EEPROM_START + off + i;
	529	ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &buf[i], 1);
d7eb9e36	530	if (ret) {
04a820ea AS	531	pr_err("olpc-battery: "
	532	"EC_BAT_EEPROM cmd @ 0x%x failed - %d!\n",
	533	ec_byte, ret);
d7eb9e36 AS	534	return -EIO;
	535	}
	536	}
	537
	538	return count;
	539	}
	540
	541	static struct bin_attribute olpc_bat_eeprom = {
	542	.attr = {
	543	.name = "eeprom",
	544	.mode = S_IRUGO,
d7eb9e36 AS	545	},
	546	.size = 0,
	547	.read = olpc_bat_eeprom_read,
	548	};
	549
144bbeae AS	550	/* Allow userspace to see the specific error value pulled from the EC */
	551
	552	static ssize_t olpc_bat_error_read(struct device *dev,
	553	struct device_attribute attr, char buf)
	554	{
	555	uint8_t ec_byte;
	556	ssize_t ret;
	557
	558	ret = olpc_ec_cmd(EC_BAT_ERRCODE, NULL, 0, &ec_byte, 1);
	559	if (ret < 0)
	560	return ret;
	561
	562	return sprintf(buf, "%d\n", ec_byte);
	563	}
	564
	565	static struct device_attribute olpc_bat_error = {
	566	.attr = {
	567	.name = "error",
	568	.mode = S_IRUGO,
	569	},
	570	.show = olpc_bat_error_read,
	571	};
	572
fb972873 DW	573	/*********************************************************************
	574	* Initialisation
	575	*********************************************************************/
	576
fb972873	577	static struct power_supply olpc_bat = {
c3503fd0	578	.name = "olpc-battery",
fb972873 DW	579	.get_property = olpc_bat_get_property,
	580	.use_for_apm = 1,
	581	};
	582
cae659af DD	583	static int olpc_battery_suspend(struct platform_device *pdev,
	584	pm_message_t state)
	585	{
	586	if (device_may_wakeup(olpc_ac.dev))
	587	olpc_ec_wakeup_set(EC_SCI_SRC_ACPWR);
	588	else
	589	olpc_ec_wakeup_clear(EC_SCI_SRC_ACPWR);
	590
	591	if (device_may_wakeup(olpc_bat.dev))
	592	olpc_ec_wakeup_set(EC_SCI_SRC_BATTERY \| EC_SCI_SRC_BATSOC
	593	\| EC_SCI_SRC_BATERR);
	594	else
	595	olpc_ec_wakeup_clear(EC_SCI_SRC_BATTERY \| EC_SCI_SRC_BATSOC
	596	\| EC_SCI_SRC_BATERR);
	597
	598	return 0;
	599	}
	600
c8afa640	601	static int olpc_battery_probe(struct platform_device *pdev)
fb972873	602	{
c3503fd0	603	int ret;
fb972873 DW	604	uint8_t status;
fb972873 DW	605
484d6d50 AS	606	/*
	607	* We've seen a number of EC protocol changes; this driver requires
	608	* the latest EC protocol, supported by 0x44 and above.
	609	*/
	610	if (olpc_platform_info.ecver < 0x44) {
	611	printk(KERN_NOTICE "OLPC EC version 0x%02x too old for "
	612	"battery driver.\n", olpc_platform_info.ecver);
fb972873 DW	613	return -ENXIO;
	614	}
	615
	616	ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &status, 1);
	617	if (ret)
	618	return ret;
	619
	620	/* Ignore the status. It doesn't actually matter */
	621
c3503fd0	622	ret = power_supply_register(&pdev->dev, &olpc_ac);
fb972873	623	if (ret)
c3503fd0	624	return ret;
fb972873	625
c566d299 DD	626	if (olpc_board_at_least(olpc_board_pre(0xd0))) { /* XO-1.5 */
	627	olpc_bat.properties = olpc_xo15_bat_props;
	628	olpc_bat.num_properties = ARRAY_SIZE(olpc_xo15_bat_props);
	629	} else { /* XO-1 */
	630	olpc_bat.properties = olpc_xo1_bat_props;
	631	olpc_bat.num_properties = ARRAY_SIZE(olpc_xo1_bat_props);
	632	}
fb972873	633
c3503fd0	634	ret = power_supply_register(&pdev->dev, &olpc_bat);
fb972873 DW	635	if (ret)
	636	goto battery_failed;
	637
d7eb9e36 AS	638	ret = device_create_bin_file(olpc_bat.dev, &olpc_bat_eeprom);
	639	if (ret)
	640	goto eeprom_failed;
	641
144bbeae AS	642	ret = device_create_file(olpc_bat.dev, &olpc_bat_error);
	643	if (ret)
	644	goto error_failed;
	645
cae659af DD	646	if (olpc_ec_wakeup_available()) {
	647	device_set_wakeup_capable(olpc_ac.dev, true);
	648	device_set_wakeup_capable(olpc_bat.dev, true);
	649	}
	650
c3503fd0	651	return 0;
fb972873	652
144bbeae AS	653	error_failed:
144bbeae AS	654	device_remove_bin_file(olpc_bat.dev, &olpc_bat_eeprom);
d7eb9e36 AS	655	eeprom_failed:
d7eb9e36 AS	656	power_supply_unregister(&olpc_bat);
fb972873 DW	657	battery_failed:
fb972873 DW	658	power_supply_unregister(&olpc_ac);
fb972873 DW	659	return ret;
	660	}
	661
415ec69f	662	static int olpc_battery_remove(struct platform_device *pdev)
fb972873	663	{
144bbeae	664	device_remove_file(olpc_bat.dev, &olpc_bat_error);
d7eb9e36	665	device_remove_bin_file(olpc_bat.dev, &olpc_bat_eeprom);
fb972873 DW	666	power_supply_unregister(&olpc_bat);
fb972873 DW	667	power_supply_unregister(&olpc_ac);
c3503fd0	668	return 0;
fb972873 DW	669	}
fb972873 DW	670
6d2cea4f	671	static const struct of_device_id olpc_battery_ids[] = {
c3503fd0 DD	672	{ .compatible = "olpc,xo1-battery" },
	673	{}
	674	};
	675	MODULE_DEVICE_TABLE(of, olpc_battery_ids);
	676
5519d00e	677	static struct platform_driver olpc_battery_driver = {
c3503fd0 DD	678	.driver = {
	679	.name = "olpc-battery",
	680	.owner = THIS_MODULE,
	681	.of_match_table = olpc_battery_ids,
	682	},
	683	.probe = olpc_battery_probe,
28ea73f4	684	.remove = olpc_battery_remove,
cae659af	685	.suspend = olpc_battery_suspend,
c3503fd0 DD	686	};
c3503fd0 DD	687
300bac7f	688	module_platform_driver(olpc_battery_driver);
fb972873 DW	689
	690	MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
	691	MODULE_LICENSE("GPL");
	692	MODULE_DESCRIPTION("Battery driver for One Laptop Per Child 'XO' machine");