[BATTERY] One Laptop Per Child power/battery driver
Signed-off-by: David Woodhouse <dwmw2@infradead.org> Signed-off-by: Anton Vorontsov <cbou@mail.ru>
This commit is contained in:
David Woodhouse
parent
efea58e397
commit
fb972873a7
@ -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
|
||||
|
||||
@ -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
|
||||
|
||||
352
drivers/power/olpc_battery.c
Normal file
352
drivers/power/olpc_battery.c
Normal file
@ -0,0 +1,352 @@
|
||||
/*
|
||||
* 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");
|
||||
Loading…
Reference in New Issue
Block a user