[net-next-2.6.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/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,
};

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;
	int16_t ec_word;
	uint8_t ec_byte;
	uint64_t 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;

		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_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;
	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,
};

/* 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, end;

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

	end = EEPROM_START + off + count;
	for (ec_byte = EEPROM_START + off; ec_byte < end; ec_byte++) {
		ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1,
				&buf[ec_byte - EEPROM_START], 1);
		if (ret) {
			printk(KERN_ERR "olpc-battery:  EC command "
					"EC_BAT_EEPROM @ 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
	11	#include <linux/module.h>
	12	#include <linux/err.h>
	13	#include <linux/platform_device.h>
	14	#include <linux/power_supply.h>
	15	#include <linux/jiffies.h>
	16	#include <linux/sched.h>
	17	#include <asm/olpc.h>
	18
	19
	20	#define EC_BAT_VOLTAGE 0x10 /* uint16_t, 9.76/32, mV /
	21	#define EC_BAT_CURRENT 0x11 /* int16_t, 15.625/120, mA /
	22	#define EC_BAT_ACR 0x12
	23	#define EC_BAT_TEMP 0x13 /* uint16_t, 100/256, °C /
	24	#define EC_AMB_TEMP 0x14 /* uint16_t, 100/256, °C /
	25	#define EC_BAT_STATUS 0x15 /* uint8_t, bitmask */
	26	#define EC_BAT_SOC 0x16 /* uint8_t, percentage */
	27	#define EC_BAT_SERIAL 0x17 /* uint8_t[6] */
	28	#define EC_BAT_EEPROM 0x18 /* uint8_t adr as input, uint8_t output */
	29	#define EC_BAT_ERRCODE 0x1f /* uint8_t, bitmask */
	30
	31	#define BAT_STAT_PRESENT 0x01
	32	#define BAT_STAT_FULL 0x02
	33	#define BAT_STAT_LOW 0x04
	34	#define BAT_STAT_DESTROY 0x08
	35	#define BAT_STAT_AC 0x10
	36	#define BAT_STAT_CHARGING 0x20
	37	#define BAT_STAT_DISCHARGING 0x40
	38
	39	#define BAT_ERR_INFOFAIL 0x02
	40	#define BAT_ERR_OVERVOLTAGE 0x04
	41	#define BAT_ERR_OVERTEMP 0x05
	42	#define BAT_ERR_GAUGESTOP 0x06
	43	#define BAT_ERR_OUT_OF_CONTROL 0x07
	44	#define BAT_ERR_ID_FAIL 0x09
	45	#define BAT_ERR_ACR_FAIL 0x10
	46
	47	#define BAT_ADDR_MFR_TYPE 0x5F
	48
	49	/*********************************************************************
	50	* Power
	51	*********************************************************************/
	52
	53	static int olpc_ac_get_prop(struct power_supply *psy,
	54	enum power_supply_property psp,
	55	union power_supply_propval *val)
	56	{
	57	int ret = 0;
	58	uint8_t status;
	59
	60	switch (psp) {
	61	case POWER_SUPPLY_PROP_ONLINE:
	62	ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &status, 1);
	63	if (ret)
	64	return ret;
65
66	val->intval = !!(status & BAT_STAT_AC);
67	break;
68	default:
69	ret = -EINVAL;
70	break;
71	}
72	return ret;
73	}
74
75	static enum power_supply_property olpc_ac_props[] = {
76	POWER_SUPPLY_PROP_ONLINE,
77	};
78
79	static struct power_supply olpc_ac = {
80	.name = "olpc-ac",
81	.type = POWER_SUPPLY_TYPE_MAINS,
82	.properties = olpc_ac_props,
83	.num_properties = ARRAY_SIZE(olpc_ac_props),
84	.get_property = olpc_ac_get_prop,
85	};
86
1ca5b9d2 DW	87	static char bat_serial[17]; /* Ick */
1ca5b9d2 DW	88
b2bd8a3b AS	89	static int olpc_bat_get_status(union power_supply_propval *val, uint8_t ec_byte)
	90	{
	91	if (olpc_platform_info.ecver > 0x44) {
	92	if (ec_byte & BAT_STAT_CHARGING)
	93	val->intval = POWER_SUPPLY_STATUS_CHARGING;
	94	else if (ec_byte & BAT_STAT_DISCHARGING)
	95	val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
	96	else if (ec_byte & BAT_STAT_FULL)
	97	val->intval = POWER_SUPPLY_STATUS_FULL;
	98	else /* er,... */
	99	val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
	100	} else {
	101	/* Older EC didn't report charge/discharge bits */
	102	if (!(ec_byte & BAT_STAT_AC)) /* No AC means discharging */
	103	val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
	104	else if (ec_byte & BAT_STAT_FULL)
	105	val->intval = POWER_SUPPLY_STATUS_FULL;
	106	else /* Not _necessarily_ true but EC doesn't tell all yet */
	107	val->intval = POWER_SUPPLY_STATUS_CHARGING;
	108	}
	109
	110	return 0;
	111	}
	112
	113	static int olpc_bat_get_health(union power_supply_propval *val)
	114	{
	115	uint8_t ec_byte;
	116	int ret;
	117
	118	ret = olpc_ec_cmd(EC_BAT_ERRCODE, NULL, 0, &ec_byte, 1);
	119	if (ret)
	120	return ret;
	121
	122	switch (ec_byte) {
	123	case 0:
	124	val->intval = POWER_SUPPLY_HEALTH_GOOD;
	125	break;
	126
	127	case BAT_ERR_OVERTEMP:
	128	val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
	129	break;
	130
	131	case BAT_ERR_OVERVOLTAGE:
	132	val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
	133	break;
	134
	135	case BAT_ERR_INFOFAIL:
	136	case BAT_ERR_OUT_OF_CONTROL:
	137	case BAT_ERR_ID_FAIL:
	138	case BAT_ERR_ACR_FAIL:
	139	val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
	140	break;
	141
	142	default:
	143	/* Eep. We don't know this failure code */
	144	ret = -EIO;
	145	}
	146
	147	return ret;
	148	}
	149
	150	static int olpc_bat_get_mfr(union power_supply_propval *val)
	151	{
	152	uint8_t ec_byte;
153	int ret;
154
155	ec_byte = BAT_ADDR_MFR_TYPE;
156	ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1);
157	if (ret)
158	return ret;
159
160	switch (ec_byte >> 4) {
161	case 1:
162	val->strval = "Gold Peak";
163	break;
164	case 2:
165	val->strval = "BYD";
166	break;
167	default:
168	val->strval = "Unknown";
169	break;
170	}
171
172	return ret;
173	}
174
175	static int olpc_bat_get_tech(union power_supply_propval *val)
176	{
177	uint8_t ec_byte;
178	int ret;
179
180	ec_byte = BAT_ADDR_MFR_TYPE;
181	ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1);
182	if (ret)
183	return ret;
184
185	switch (ec_byte & 0xf) {
186	case 1:
187	val->intval = POWER_SUPPLY_TECHNOLOGY_NiMH;
188	break;
189	case 2:
190	val->intval = POWER_SUPPLY_TECHNOLOGY_LiFe;
191	break;
192	default:
193	val->intval = POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
194	break;
195	}
196
197	return ret;
198	}
199
fb972873 DW	200	/*********************************************************************
	201	* Battery properties
	202	*********************************************************************/
	203	static int olpc_bat_get_property(struct power_supply *psy,
	204	enum power_supply_property psp,
	205	union power_supply_propval *val)
	206	{
	207	int ret = 0;
	208	int16_t ec_word;
	209	uint8_t ec_byte;
1ca5b9d2	210	uint64_t ser_buf;
fb972873 DW	211
	212	ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &ec_byte, 1);
	213	if (ret)
	214	return ret;
	215
	216	/* Theoretically there's a race here -- the battery could be
	217	removed immediately after we check whether it's present, and
	218	then we query for some other property of the now-absent battery.
	219	It doesn't matter though -- the EC will return the last-known
	220	information, and it's as if we just ran that _little_ bit faster
	221	and managed to read it out before the battery went away. */
	222	if (!(ec_byte & BAT_STAT_PRESENT) && psp != POWER_SUPPLY_PROP_PRESENT)
	223	return -ENODEV;
	224
	225	switch (psp) {
	226	case POWER_SUPPLY_PROP_STATUS:
b2bd8a3b AS	227	ret = olpc_bat_get_status(val, ec_byte);
	228	if (ret)
	229	return ret;
	230	break;
fb972873 DW	231	case POWER_SUPPLY_PROP_PRESENT:
	232	val->intval = !!(ec_byte & BAT_STAT_PRESENT);
	233	break;
	234
	235	case POWER_SUPPLY_PROP_HEALTH:
	236	if (ec_byte & BAT_STAT_DESTROY)
	237	val->intval = POWER_SUPPLY_HEALTH_DEAD;
	238	else {
b2bd8a3b	239	ret = olpc_bat_get_health(val);
fb972873 DW	240	if (ret)
fb972873 DW	241	return ret;
fb972873 DW	242	}
	243	break;
	244
	245	case POWER_SUPPLY_PROP_MANUFACTURER:
b2bd8a3b	246	ret = olpc_bat_get_mfr(val);
fb972873 DW	247	if (ret)
fb972873 DW	248	return ret;
fb972873 DW	249	break;
fb972873 DW	250	case POWER_SUPPLY_PROP_TECHNOLOGY:
b2bd8a3b	251	ret = olpc_bat_get_tech(val);
fb972873 DW	252	if (ret)
fb972873 DW	253	return ret;
fb972873 DW	254	break;
	255	case POWER_SUPPLY_PROP_VOLTAGE_AVG:
	256	ret = olpc_ec_cmd(EC_BAT_VOLTAGE, NULL, 0, (void *)&ec_word, 2);
	257	if (ret)
	258	return ret;
	259
	260	ec_word = be16_to_cpu(ec_word);
	261	val->intval = ec_word * 9760L / 32;
	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
	268	ec_word = be16_to_cpu(ec_word);
	269	val->intval = ec_word * 15625L / 120;
	270	break;
	271	case POWER_SUPPLY_PROP_CAPACITY:
	272	ret = olpc_ec_cmd(EC_BAT_SOC, NULL, 0, &ec_byte, 1);
	273	if (ret)
	274	return ret;
	275	val->intval = ec_byte;
	276	break;
fb972873 DW	277	case POWER_SUPPLY_PROP_TEMP:
	278	ret = olpc_ec_cmd(EC_BAT_TEMP, NULL, 0, (void *)&ec_word, 2);
	279	if (ret)
	280	return ret;
	281	ec_word = be16_to_cpu(ec_word);
	282	val->intval = ec_word * 100 / 256;
	283	break;
	284	case POWER_SUPPLY_PROP_TEMP_AMBIENT:
	285	ret = olpc_ec_cmd(EC_AMB_TEMP, NULL, 0, (void *)&ec_word, 2);
	286	if (ret)
	287	return ret;
	288
	289	ec_word = be16_to_cpu(ec_word);
	290	val->intval = ec_word * 100 / 256;
	291	break;
1ca5b9d2 DW	292	case POWER_SUPPLY_PROP_SERIAL_NUMBER:
	293	ret = olpc_ec_cmd(EC_BAT_SERIAL, NULL, 0, (void *)&ser_buf, 8);
	294	if (ret)
	295	return ret;
	296
	297	sprintf(bat_serial, "%016llx", (long long)be64_to_cpu(ser_buf));
	298	val->strval = bat_serial;
	299	break;
fb972873 DW	300	default:
	301	ret = -EINVAL;
	302	break;
	303	}
	304
	305	return ret;
	306	}
	307
	308	static enum power_supply_property olpc_bat_props[] = {
	309	POWER_SUPPLY_PROP_STATUS,
	310	POWER_SUPPLY_PROP_PRESENT,
	311	POWER_SUPPLY_PROP_HEALTH,
	312	POWER_SUPPLY_PROP_TECHNOLOGY,
	313	POWER_SUPPLY_PROP_VOLTAGE_AVG,
	314	POWER_SUPPLY_PROP_CURRENT_AVG,
	315	POWER_SUPPLY_PROP_CAPACITY,
fb972873 DW	316	POWER_SUPPLY_PROP_TEMP,
	317	POWER_SUPPLY_PROP_TEMP_AMBIENT,
	318	POWER_SUPPLY_PROP_MANUFACTURER,
1ca5b9d2	319	POWER_SUPPLY_PROP_SERIAL_NUMBER,
fb972873 DW	320	};
fb972873 DW	321
d7eb9e36 AS	322	/* EEPROM reading goes completely around the power_supply API, sadly */
	323
	324	#define EEPROM_START 0x20
	325	#define EEPROM_END 0x80
	326	#define EEPROM_SIZE (EEPROM_END - EEPROM_START)
	327
	328	static ssize_t olpc_bat_eeprom_read(struct kobject *kobj,
	329	struct bin_attribute attr, char buf, loff_t off, size_t count)
	330	{
	331	uint8_t ec_byte;
	332	int ret, end;
	333
	334	if (off >= EEPROM_SIZE)
	335	return 0;
	336	if (off + count > EEPROM_SIZE)
	337	count = EEPROM_SIZE - off;
	338
	339	end = EEPROM_START + off + count;
	340	for (ec_byte = EEPROM_START + off; ec_byte < end; ec_byte++) {
	341	ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1,
	342	&buf[ec_byte - EEPROM_START], 1);
	343	if (ret) {
	344	printk(KERN_ERR "olpc-battery: EC command "
	345	"EC_BAT_EEPROM @ 0x%x failed -"
	346	" %d!\n", ec_byte, ret);
	347	return -EIO;
	348	}
	349	}
	350
	351	return count;
	352	}
	353
	354	static struct bin_attribute olpc_bat_eeprom = {
	355	.attr = {
	356	.name = "eeprom",
	357	.mode = S_IRUGO,
	358	.owner = THIS_MODULE,
	359	},
	360	.size = 0,
	361	.read = olpc_bat_eeprom_read,
	362	};
	363
fb972873 DW	364	/*********************************************************************
	365	* Initialisation
	366	*********************************************************************/
	367
	368	static struct platform_device *bat_pdev;
	369
	370	static struct power_supply olpc_bat = {
	371	.properties = olpc_bat_props,
	372	.num_properties = ARRAY_SIZE(olpc_bat_props),
	373	.get_property = olpc_bat_get_property,
	374	.use_for_apm = 1,
	375	};
	376
	377	void olpc_battery_trigger_uevent(unsigned long cause)
	378	{
	379	if (cause & EC_SCI_SRC_ACPWR)
	380	kobject_uevent(&olpc_ac.dev->kobj, KOBJ_CHANGE);
	381	if (cause & (EC_SCI_SRC_BATERR\|EC_SCI_SRC_BATSOC\|EC_SCI_SRC_BATTERY))
	382	kobject_uevent(&olpc_bat.dev->kobj, KOBJ_CHANGE);
	383	}
	384
	385	static int __init olpc_bat_init(void)
	386	{
	387	int ret = 0;
	388	uint8_t status;
	389
	390	if (!olpc_platform_info.ecver)
	391	return -ENXIO;
484d6d50 AS	392
	393	/*
	394	* We've seen a number of EC protocol changes; this driver requires
	395	* the latest EC protocol, supported by 0x44 and above.
	396	*/
	397	if (olpc_platform_info.ecver < 0x44) {
	398	printk(KERN_NOTICE "OLPC EC version 0x%02x too old for "
	399	"battery driver.\n", olpc_platform_info.ecver);
fb972873 DW	400	return -ENXIO;
	401	}
	402
	403	ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &status, 1);
	404	if (ret)
	405	return ret;
	406
	407	/* Ignore the status. It doesn't actually matter */
	408
	409	bat_pdev = platform_device_register_simple("olpc-battery", 0, NULL, 0);
	410	if (IS_ERR(bat_pdev))
	411	return PTR_ERR(bat_pdev);
	412
	413	ret = power_supply_register(&bat_pdev->dev, &olpc_ac);
	414	if (ret)
	415	goto ac_failed;
	416
	417	olpc_bat.name = bat_pdev->name;
	418
	419	ret = power_supply_register(&bat_pdev->dev, &olpc_bat);
	420	if (ret)
	421	goto battery_failed;
	422
d7eb9e36 AS	423	ret = device_create_bin_file(olpc_bat.dev, &olpc_bat_eeprom);
	424	if (ret)
	425	goto eeprom_failed;
	426
fb972873 DW	427	goto success;
fb972873 DW	428
d7eb9e36 AS	429	eeprom_failed:
d7eb9e36 AS	430	power_supply_unregister(&olpc_bat);
fb972873 DW	431	battery_failed:
	432	power_supply_unregister(&olpc_ac);
	433	ac_failed:
	434	platform_device_unregister(bat_pdev);
	435	success:
	436	return ret;
	437	}
	438
	439	static void __exit olpc_bat_exit(void)
	440	{
d7eb9e36	441	device_remove_bin_file(olpc_bat.dev, &olpc_bat_eeprom);
fb972873 DW	442	power_supply_unregister(&olpc_bat);
	443	power_supply_unregister(&olpc_ac);
	444	platform_device_unregister(bat_pdev);
fb972873 DW	445	}
	446
	447	module_init(olpc_bat_init);
	448	module_exit(olpc_bat_exit);
	449
	450	MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
	451	MODULE_LICENSE("GPL");
	452	MODULE_DESCRIPTION("Battery driver for One Laptop Per Child 'XO' machine");