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

/*
 * 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/kernel.h>
#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	/* 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_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)
			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;
}

/*********************************************************************
 *		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) && 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_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_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:
		ret = olpc_ec_cmd(EC_BAT_VOLTAGE, NULL, 0, (void *)&ec_word, 2);
		if (ret)
			return ret;

		val->intval = (int)be16_to_cpu(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;

		val->intval = (int)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_TEMP:
		ret = olpc_ec_cmd(EC_BAT_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_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 = (int)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;
	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_TEMP,
	POWER_SUPPLY_PROP_TEMP_AMBIENT,
	POWER_SUPPLY_PROP_MANUFACTURER,
	POWER_SUPPLY_PROP_SERIAL_NUMBER,
	POWER_SUPPLY_PROP_CHARGE_COUNTER,
};

/* 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 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,
		.owner = THIS_MODULE,
	},
	.size = 0,
	.read = olpc_bat_eeprom_read,
};

/*********************************************************************
 *		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;

	/*
	 * 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 */

	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;

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

	goto success;

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

static void __exit olpc_bat_exit(void)
{
	device_remove_bin_file(olpc_bat.dev, &olpc_bat_eeprom);
	power_supply_unregister(&olpc_bat);
	power_supply_unregister(&olpc_ac);
	platform_device_unregister(bat_pdev);
}

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");
Commit	Line	Data
fb972873 DW	1	/*
	2	* Battery driver for One Laptop Per Child board.
	3	*
	4	* Copyright © 2006 David Woodhouse <dwmw2@infradead.org>
	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 DW	12	#include <linux/module.h>
	13	#include <linux/err.h>
	14	#include <linux/platform_device.h>
	15	#include <linux/power_supply.h>
	16	#include <linux/jiffies.h>
	17	#include <linux/sched.h>
	18	#include <asm/olpc.h>
	19
	20
	21	#define EC_BAT_VOLTAGE 0x10 /* uint16_t, 9.76/32, mV /
	22	#define EC_BAT_CURRENT 0x11 /* int16_t, 15.625/120, mA /
75d88079	23	#define EC_BAT_ACR 0x12 /* int16_t, 6250/15, µAh /
fb972873 DW	24	#define EC_BAT_TEMP 0x13 /* uint16_t, 100/256, °C /
	25	#define EC_AMB_TEMP 0x14 /* uint16_t, 100/256, °C /
	26	#define EC_BAT_STATUS 0x15 /* uint8_t, bitmask */
	27	#define EC_BAT_SOC 0x16 /* uint8_t, percentage */
	28	#define EC_BAT_SERIAL 0x17 /* uint8_t[6] */
	29	#define EC_BAT_EEPROM 0x18 /* uint8_t adr as input, uint8_t output */
	30	#define EC_BAT_ERRCODE 0x1f /* uint8_t, bitmask */
	31
	32	#define BAT_STAT_PRESENT 0x01
	33	#define BAT_STAT_FULL 0x02
	34	#define BAT_STAT_LOW 0x04
	35	#define BAT_STAT_DESTROY 0x08
	36	#define BAT_STAT_AC 0x10
	37	#define BAT_STAT_CHARGING 0x20
	38	#define BAT_STAT_DISCHARGING 0x40
	39
	40	#define BAT_ERR_INFOFAIL 0x02
	41	#define BAT_ERR_OVERVOLTAGE 0x04
	42	#define BAT_ERR_OVERTEMP 0x05
	43	#define BAT_ERR_GAUGESTOP 0x06
	44	#define BAT_ERR_OUT_OF_CONTROL 0x07
	45	#define BAT_ERR_ID_FAIL 0x09
	46	#define BAT_ERR_ACR_FAIL 0x10
	47
	48	#define BAT_ADDR_MFR_TYPE 0x5F
	49
	50	/*********************************************************************
	51	* Power
	52	*********************************************************************/
	53
	54	static int olpc_ac_get_prop(struct power_supply *psy,
	55	enum power_supply_property psp,
	56	union power_supply_propval *val)
	57	{
	58	int ret = 0;
	59	uint8_t status;
	60
	61	switch (psp) {
	62	case POWER_SUPPLY_PROP_ONLINE:
	63	ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &status, 1);
	64	if (ret)
	65	return ret;
	66
	67	val->intval = !!(status & BAT_STAT_AC);
	68	break;
	69	default:
	70	ret = -EINVAL;
	71	break;
	72	}
	73	return ret;
	74	}
	75
	76	static enum power_supply_property olpc_ac_props[] = {
	77	POWER_SUPPLY_PROP_ONLINE,
	78	};
	79
	80	static struct power_supply olpc_ac = {
	81	.name = "olpc-ac",
	82	.type = POWER_SUPPLY_TYPE_MAINS,
	83	.properties = olpc_ac_props,
	84	.num_properties = ARRAY_SIZE(olpc_ac_props),
	85	.get_property = olpc_ac_get_prop,
	86	};
	87
1ca5b9d2 DW	88	static char bat_serial[17]; /* Ick */
1ca5b9d2 DW	89
b2bd8a3b AS	90	static int olpc_bat_get_status(union power_supply_propval *val, uint8_t ec_byte)
	91	{
	92	if (olpc_platform_info.ecver > 0x44) {
	93	if (ec_byte & BAT_STAT_CHARGING)
	94	val->intval = POWER_SUPPLY_STATUS_CHARGING;
	95	else if (ec_byte & BAT_STAT_DISCHARGING)
	96	val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
	97	else if (ec_byte & BAT_STAT_FULL)
	98	val->intval = POWER_SUPPLY_STATUS_FULL;
	99	else /* er,... */
	100	val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
	101	} else {
	102	/* Older EC didn't report charge/discharge bits */
	103	if (!(ec_byte & BAT_STAT_AC)) /* No AC means discharging */
	104	val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
	105	else if (ec_byte & BAT_STAT_FULL)
	106	val->intval = POWER_SUPPLY_STATUS_FULL;
	107	else /* Not _necessarily_ true but EC doesn't tell all yet */
	108	val->intval = POWER_SUPPLY_STATUS_CHARGING;
	109	}
	110
	111	return 0;
	112	}
	113
	114	static int olpc_bat_get_health(union power_supply_propval *val)
	115	{
	116	uint8_t ec_byte;
	117	int ret;
	118
	119	ret = olpc_ec_cmd(EC_BAT_ERRCODE, NULL, 0, &ec_byte, 1);
	120	if (ret)
	121	return ret;
	122
	123	switch (ec_byte) {
	124	case 0:
	125	val->intval = POWER_SUPPLY_HEALTH_GOOD;
	126	break;
	127
	128	case BAT_ERR_OVERTEMP:
	129	val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
	130	break;
	131
	132	case BAT_ERR_OVERVOLTAGE:
	133	val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
	134	break;
	135
	136	case BAT_ERR_INFOFAIL:
	137	case BAT_ERR_OUT_OF_CONTROL:
	138	case BAT_ERR_ID_FAIL:
	139	case BAT_ERR_ACR_FAIL:
	140	val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
	141	break;
	142
	143	default:
	144	/* Eep. We don't know this failure code */
	145	ret = -EIO;
	146	}
	147
	148	return ret;
	149	}
	150
	151	static int olpc_bat_get_mfr(union power_supply_propval *val)
	152	{
	153	uint8_t ec_byte;
154	int ret;
155
156	ec_byte = BAT_ADDR_MFR_TYPE;
157	ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1);
158	if (ret)
159	return ret;
160
161	switch (ec_byte >> 4) {
162	case 1:
163	val->strval = "Gold Peak";
164	break;
165	case 2:
166	val->strval = "BYD";
167	break;
168	default:
169	val->strval = "Unknown";
170	break;
171	}
172
173	return ret;
174	}
175
176	static int olpc_bat_get_tech(union power_supply_propval *val)
177	{
178	uint8_t ec_byte;
179	int ret;
180
181	ec_byte = BAT_ADDR_MFR_TYPE;
182	ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1);
183	if (ret)
184	return ret;
185
186	switch (ec_byte & 0xf) {
187	case 1:
188	val->intval = POWER_SUPPLY_TECHNOLOGY_NiMH;
189	break;
190	case 2:
191	val->intval = POWER_SUPPLY_TECHNOLOGY_LiFe;
192	break;
193	default:
194	val->intval = POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
195	break;
196	}
197
198	return ret;
199	}
200
fb972873 DW	201	/*********************************************************************
	202	* Battery properties
	203	*********************************************************************/
	204	static int olpc_bat_get_property(struct power_supply *psy,
	205	enum power_supply_property psp,
	206	union power_supply_propval *val)
	207	{
	208	int ret = 0;
8e9c7716	209	__be16 ec_word;
fb972873	210	uint8_t ec_byte;
8e9c7716	211	__be64 ser_buf;
fb972873 DW	212
	213	ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &ec_byte, 1);
	214	if (ret)
	215	return ret;
	216
	217	/* Theoretically there's a race here -- the battery could be
	218	removed immediately after we check whether it's present, and
	219	then we query for some other property of the now-absent battery.
	220	It doesn't matter though -- the EC will return the last-known
	221	information, and it's as if we just ran that _little_ bit faster
	222	and managed to read it out before the battery went away. */
	223	if (!(ec_byte & BAT_STAT_PRESENT) && psp != POWER_SUPPLY_PROP_PRESENT)
	224	return -ENODEV;
	225
	226	switch (psp) {
	227	case POWER_SUPPLY_PROP_STATUS:
b2bd8a3b AS	228	ret = olpc_bat_get_status(val, ec_byte);
	229	if (ret)
	230	return ret;
	231	break;
fb972873 DW	232	case POWER_SUPPLY_PROP_PRESENT:
	233	val->intval = !!(ec_byte & BAT_STAT_PRESENT);
	234	break;
	235
	236	case POWER_SUPPLY_PROP_HEALTH:
	237	if (ec_byte & BAT_STAT_DESTROY)
	238	val->intval = POWER_SUPPLY_HEALTH_DEAD;
	239	else {
b2bd8a3b	240	ret = olpc_bat_get_health(val);
fb972873 DW	241	if (ret)
fb972873 DW	242	return ret;
fb972873 DW	243	}
	244	break;
	245
	246	case POWER_SUPPLY_PROP_MANUFACTURER:
b2bd8a3b	247	ret = olpc_bat_get_mfr(val);
fb972873 DW	248	if (ret)
fb972873 DW	249	return ret;
fb972873 DW	250	break;
fb972873 DW	251	case POWER_SUPPLY_PROP_TECHNOLOGY:
b2bd8a3b	252	ret = olpc_bat_get_tech(val);
fb972873 DW	253	if (ret)
fb972873 DW	254	return ret;
fb972873 DW	255	break;
	256	case POWER_SUPPLY_PROP_VOLTAGE_AVG:
	257	ret = olpc_ec_cmd(EC_BAT_VOLTAGE, NULL, 0, (void *)&ec_word, 2);
	258	if (ret)
	259	return ret;
	260
8e9c7716	261	val->intval = (int)be16_to_cpu(ec_word) * 9760L / 32;
fb972873 DW	262	break;
	263	case POWER_SUPPLY_PROP_CURRENT_AVG:
	264	ret = olpc_ec_cmd(EC_BAT_CURRENT, NULL, 0, (void *)&ec_word, 2);
	265	if (ret)
	266	return ret;
	267
8e9c7716	268	val->intval = (int)be16_to_cpu(ec_word) * 15625L / 120;
fb972873 DW	269	break;
	270	case POWER_SUPPLY_PROP_CAPACITY:
	271	ret = olpc_ec_cmd(EC_BAT_SOC, NULL, 0, &ec_byte, 1);
	272	if (ret)
	273	return ret;
	274	val->intval = ec_byte;
	275	break;
fb972873 DW	276	case POWER_SUPPLY_PROP_TEMP:
	277	ret = olpc_ec_cmd(EC_BAT_TEMP, NULL, 0, (void *)&ec_word, 2);
	278	if (ret)
	279	return ret;
8e9c7716 HH	280
8e9c7716 HH	281	val->intval = (int)be16_to_cpu(ec_word) * 100 / 256;
fb972873 DW	282	break;
	283	case POWER_SUPPLY_PROP_TEMP_AMBIENT:
	284	ret = olpc_ec_cmd(EC_AMB_TEMP, NULL, 0, (void *)&ec_word, 2);
	285	if (ret)
	286	return ret;
	287
8e9c7716	288	val->intval = (int)be16_to_cpu(ec_word) * 100 / 256;
fb972873	289	break;
8e552c36 AS	290	case POWER_SUPPLY_PROP_CHARGE_COUNTER:
	291	ret = olpc_ec_cmd(EC_BAT_ACR, NULL, 0, (void *)&ec_word, 2);
	292	if (ret)
	293	return ret;
	294
8e9c7716	295	val->intval = (int)be16_to_cpu(ec_word) * 6250 / 15;
8e552c36	296	break;
1ca5b9d2 DW	297	case POWER_SUPPLY_PROP_SERIAL_NUMBER:
	298	ret = olpc_ec_cmd(EC_BAT_SERIAL, NULL, 0, (void *)&ser_buf, 8);
	299	if (ret)
	300	return ret;
	301
	302	sprintf(bat_serial, "%016llx", (long long)be64_to_cpu(ser_buf));
	303	val->strval = bat_serial;
	304	break;
fb972873 DW	305	default:
	306	ret = -EINVAL;
	307	break;
	308	}
	309
	310	return ret;
	311	}
	312
	313	static enum power_supply_property olpc_bat_props[] = {
	314	POWER_SUPPLY_PROP_STATUS,
	315	POWER_SUPPLY_PROP_PRESENT,
	316	POWER_SUPPLY_PROP_HEALTH,
	317	POWER_SUPPLY_PROP_TECHNOLOGY,
	318	POWER_SUPPLY_PROP_VOLTAGE_AVG,
	319	POWER_SUPPLY_PROP_CURRENT_AVG,
	320	POWER_SUPPLY_PROP_CAPACITY,
fb972873 DW	321	POWER_SUPPLY_PROP_TEMP,
	322	POWER_SUPPLY_PROP_TEMP_AMBIENT,
	323	POWER_SUPPLY_PROP_MANUFACTURER,
1ca5b9d2	324	POWER_SUPPLY_PROP_SERIAL_NUMBER,
8e552c36	325	POWER_SUPPLY_PROP_CHARGE_COUNTER,
fb972873 DW	326	};
fb972873 DW	327
d7eb9e36 AS	328	/* EEPROM reading goes completely around the power_supply API, sadly */
	329
	330	#define EEPROM_START 0x20
	331	#define EEPROM_END 0x80
	332	#define EEPROM_SIZE (EEPROM_END - EEPROM_START)
	333
	334	static ssize_t olpc_bat_eeprom_read(struct kobject *kobj,
	335	struct bin_attribute attr, char buf, loff_t off, size_t count)
	336	{
	337	uint8_t ec_byte;
04a820ea AS	338	int ret;
04a820ea AS	339	int i;
d7eb9e36 AS	340
	341	if (off >= EEPROM_SIZE)
	342	return 0;
	343	if (off + count > EEPROM_SIZE)
	344	count = EEPROM_SIZE - off;
	345
04a820ea AS	346	for (i = 0; i < count; i++) {
	347	ec_byte = EEPROM_START + off + i;
	348	ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &buf[i], 1);
d7eb9e36	349	if (ret) {
04a820ea AS	350	pr_err("olpc-battery: "
	351	"EC_BAT_EEPROM cmd @ 0x%x failed - %d!\n",
	352	ec_byte, ret);
d7eb9e36 AS	353	return -EIO;
	354	}
	355	}
	356
	357	return count;
	358	}
	359
	360	static struct bin_attribute olpc_bat_eeprom = {
	361	.attr = {
	362	.name = "eeprom",
	363	.mode = S_IRUGO,
	364	.owner = THIS_MODULE,
	365	},
	366	.size = 0,
	367	.read = olpc_bat_eeprom_read,
	368	};
	369
fb972873 DW	370	/*********************************************************************
	371	* Initialisation
	372	*********************************************************************/
	373
	374	static struct platform_device *bat_pdev;
	375
	376	static struct power_supply olpc_bat = {
	377	.properties = olpc_bat_props,
	378	.num_properties = ARRAY_SIZE(olpc_bat_props),
	379	.get_property = olpc_bat_get_property,
	380	.use_for_apm = 1,
	381	};
	382
	383	void olpc_battery_trigger_uevent(unsigned long cause)
	384	{
	385	if (cause & EC_SCI_SRC_ACPWR)
	386	kobject_uevent(&olpc_ac.dev->kobj, KOBJ_CHANGE);
	387	if (cause & (EC_SCI_SRC_BATERR\|EC_SCI_SRC_BATSOC\|EC_SCI_SRC_BATTERY))
	388	kobject_uevent(&olpc_bat.dev->kobj, KOBJ_CHANGE);
	389	}
	390
	391	static int __init olpc_bat_init(void)
	392	{
	393	int ret = 0;
	394	uint8_t status;
	395
	396	if (!olpc_platform_info.ecver)
	397	return -ENXIO;
484d6d50 AS	398
	399	/*
	400	* We've seen a number of EC protocol changes; this driver requires
	401	* the latest EC protocol, supported by 0x44 and above.
	402	*/
	403	if (olpc_platform_info.ecver < 0x44) {
	404	printk(KERN_NOTICE "OLPC EC version 0x%02x too old for "
	405	"battery driver.\n", olpc_platform_info.ecver);
fb972873 DW	406	return -ENXIO;
	407	}
	408
	409	ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &status, 1);
	410	if (ret)
	411	return ret;
	412
	413	/* Ignore the status. It doesn't actually matter */
	414
	415	bat_pdev = platform_device_register_simple("olpc-battery", 0, NULL, 0);
	416	if (IS_ERR(bat_pdev))
	417	return PTR_ERR(bat_pdev);
	418
	419	ret = power_supply_register(&bat_pdev->dev, &olpc_ac);
	420	if (ret)
	421	goto ac_failed;
	422
	423	olpc_bat.name = bat_pdev->name;
	424
	425	ret = power_supply_register(&bat_pdev->dev, &olpc_bat);
	426	if (ret)
	427	goto battery_failed;
	428
d7eb9e36 AS	429	ret = device_create_bin_file(olpc_bat.dev, &olpc_bat_eeprom);
	430	if (ret)
	431	goto eeprom_failed;
	432
fb972873 DW	433	goto success;
fb972873 DW	434
d7eb9e36 AS	435	eeprom_failed:
d7eb9e36 AS	436	power_supply_unregister(&olpc_bat);
fb972873 DW	437	battery_failed:
	438	power_supply_unregister(&olpc_ac);
	439	ac_failed:
	440	platform_device_unregister(bat_pdev);
	441	success:
	442	return ret;
	443	}
	444
	445	static void __exit olpc_bat_exit(void)
	446	{
d7eb9e36	447	device_remove_bin_file(olpc_bat.dev, &olpc_bat_eeprom);
fb972873 DW	448	power_supply_unregister(&olpc_bat);
	449	power_supply_unregister(&olpc_ac);
	450	platform_device_unregister(bat_pdev);
fb972873 DW	451	}
	452
	453	module_init(olpc_bat_init);
	454	module_exit(olpc_bat_exit);
	455
	456	MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
	457	MODULE_LICENSE("GPL");
	458	MODULE_DESCRIPTION("Battery driver for One Laptop Per Child 'XO' machine");