04a820ead0
The eeprom read function was placing values into the wrong place in 'buf'; we were starting from buf[off], rather than buf[0]. Also, the for loop that we were using was much uglier than it needed to be. This cleans it up a bit. Signed-off-by: Andres Salomon <dilinger@collabora.co.uk> Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>
459 lines
11 KiB
C
459 lines
11 KiB
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");
|