352 lines
9.2 KiB
C
352 lines
9.2 KiB
C
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/*
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* Battery driver for One Laptop Per Child board.
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*
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* Copyright © 2006 David Woodhouse <dwmw2@infradead.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/err.h>
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#include <linux/platform_device.h>
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#include <linux/power_supply.h>
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#include <linux/jiffies.h>
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#include <linux/sched.h>
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#include <asm/olpc.h>
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#define EC_BAT_VOLTAGE 0x10 /* uint16_t, *9.76/32, mV */
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#define EC_BAT_CURRENT 0x11 /* int16_t, *15.625/120, mA */
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#define EC_BAT_ACR 0x12
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#define EC_BAT_TEMP 0x13 /* uint16_t, *100/256, °C */
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#define EC_AMB_TEMP 0x14 /* uint16_t, *100/256, °C */
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#define EC_BAT_STATUS 0x15 /* uint8_t, bitmask */
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#define EC_BAT_SOC 0x16 /* uint8_t, percentage */
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#define EC_BAT_SERIAL 0x17 /* uint8_t[6] */
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#define EC_BAT_EEPROM 0x18 /* uint8_t adr as input, uint8_t output */
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#define EC_BAT_ERRCODE 0x1f /* uint8_t, bitmask */
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#define BAT_STAT_PRESENT 0x01
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#define BAT_STAT_FULL 0x02
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#define BAT_STAT_LOW 0x04
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#define BAT_STAT_DESTROY 0x08
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#define BAT_STAT_AC 0x10
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#define BAT_STAT_CHARGING 0x20
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#define BAT_STAT_DISCHARGING 0x40
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#define BAT_ERR_INFOFAIL 0x02
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#define BAT_ERR_OVERVOLTAGE 0x04
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#define BAT_ERR_OVERTEMP 0x05
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#define BAT_ERR_GAUGESTOP 0x06
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#define BAT_ERR_OUT_OF_CONTROL 0x07
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#define BAT_ERR_ID_FAIL 0x09
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#define BAT_ERR_ACR_FAIL 0x10
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#define BAT_ADDR_MFR_TYPE 0x5F
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/*********************************************************************
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* Power
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*********************************************************************/
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static int olpc_ac_get_prop(struct power_supply *psy,
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enum power_supply_property psp,
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union power_supply_propval *val)
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{
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int ret = 0;
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uint8_t status;
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switch (psp) {
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case POWER_SUPPLY_PROP_ONLINE:
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ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &status, 1);
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if (ret)
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return ret;
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val->intval = !!(status & BAT_STAT_AC);
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break;
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default:
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ret = -EINVAL;
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break;
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}
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return ret;
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}
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static enum power_supply_property olpc_ac_props[] = {
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POWER_SUPPLY_PROP_ONLINE,
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};
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static struct power_supply olpc_ac = {
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.name = "olpc-ac",
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.type = POWER_SUPPLY_TYPE_MAINS,
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.properties = olpc_ac_props,
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.num_properties = ARRAY_SIZE(olpc_ac_props),
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.get_property = olpc_ac_get_prop,
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};
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/*********************************************************************
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* Battery properties
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*********************************************************************/
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static int olpc_bat_get_property(struct power_supply *psy,
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enum power_supply_property psp,
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union power_supply_propval *val)
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{
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int ret = 0;
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int16_t ec_word;
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uint8_t ec_byte;
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ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &ec_byte, 1);
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if (ret)
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return ret;
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/* Theoretically there's a race here -- the battery could be
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removed immediately after we check whether it's present, and
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then we query for some other property of the now-absent battery.
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It doesn't matter though -- the EC will return the last-known
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information, and it's as if we just ran that _little_ bit faster
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and managed to read it out before the battery went away. */
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if (!(ec_byte & BAT_STAT_PRESENT) && psp != POWER_SUPPLY_PROP_PRESENT)
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return -ENODEV;
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switch (psp) {
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case POWER_SUPPLY_PROP_STATUS:
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if (olpc_platform_info.ecver > 0x44) {
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if (ec_byte & BAT_STAT_CHARGING)
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val->intval = POWER_SUPPLY_STATUS_CHARGING;
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else if (ec_byte & BAT_STAT_DISCHARGING)
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val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
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else if (ec_byte & BAT_STAT_FULL)
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val->intval = POWER_SUPPLY_STATUS_FULL;
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else /* er,... */
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val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
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} else {
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/* Older EC didn't report charge/discharge bits */
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if (!(ec_byte & BAT_STAT_AC)) /* No AC means discharging */
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val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
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else if (ec_byte & BAT_STAT_FULL)
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val->intval = POWER_SUPPLY_STATUS_FULL;
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else /* Not _necessarily_ true but EC doesn't tell all yet */
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val->intval = POWER_SUPPLY_STATUS_CHARGING;
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break;
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}
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case POWER_SUPPLY_PROP_PRESENT:
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val->intval = !!(ec_byte & BAT_STAT_PRESENT);
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break;
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case POWER_SUPPLY_PROP_HEALTH:
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if (ec_byte & BAT_STAT_DESTROY)
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val->intval = POWER_SUPPLY_HEALTH_DEAD;
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else {
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ret = olpc_ec_cmd(EC_BAT_ERRCODE, NULL, 0, &ec_byte, 1);
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if (ret)
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return ret;
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switch (ec_byte) {
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case 0:
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val->intval = POWER_SUPPLY_HEALTH_GOOD;
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break;
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case BAT_ERR_OVERTEMP:
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val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
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break;
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case BAT_ERR_OVERVOLTAGE:
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val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
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break;
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case BAT_ERR_INFOFAIL:
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case BAT_ERR_OUT_OF_CONTROL:
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case BAT_ERR_ID_FAIL:
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case BAT_ERR_ACR_FAIL:
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val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
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break;
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default:
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/* Eep. We don't know this failure code */
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return -EIO;
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}
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}
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break;
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case POWER_SUPPLY_PROP_MANUFACTURER:
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ec_byte = BAT_ADDR_MFR_TYPE;
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ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1);
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if (ret)
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return ret;
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switch (ec_byte >> 4) {
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case 1:
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val->strval = "Gold Peak";
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break;
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case 2:
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val->strval = "BYD";
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break;
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default:
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val->strval = "Unknown";
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break;
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}
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break;
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case POWER_SUPPLY_PROP_TECHNOLOGY:
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ec_byte = BAT_ADDR_MFR_TYPE;
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ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1);
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if (ret)
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return ret;
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switch (ec_byte & 0xf) {
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case 1:
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val->intval = POWER_SUPPLY_TECHNOLOGY_NiMH;
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break;
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case 2:
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val->intval = POWER_SUPPLY_TECHNOLOGY_LiFe;
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break;
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default:
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val->intval = POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
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break;
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}
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_AVG:
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ret = olpc_ec_cmd(EC_BAT_VOLTAGE, NULL, 0, (void *)&ec_word, 2);
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if (ret)
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return ret;
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ec_word = be16_to_cpu(ec_word);
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val->intval = ec_word * 9760L / 32;
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break;
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case POWER_SUPPLY_PROP_CURRENT_AVG:
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ret = olpc_ec_cmd(EC_BAT_CURRENT, NULL, 0, (void *)&ec_word, 2);
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if (ret)
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return ret;
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ec_word = be16_to_cpu(ec_word);
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val->intval = ec_word * 15625L / 120;
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break;
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case POWER_SUPPLY_PROP_CAPACITY:
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ret = olpc_ec_cmd(EC_BAT_SOC, NULL, 0, &ec_byte, 1);
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if (ret)
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return ret;
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val->intval = ec_byte;
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break;
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case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
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if (ec_byte & BAT_STAT_FULL)
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val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
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else if (ec_byte & BAT_STAT_LOW)
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val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
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else
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val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
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break;
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case POWER_SUPPLY_PROP_TEMP:
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ret = olpc_ec_cmd(EC_BAT_TEMP, NULL, 0, (void *)&ec_word, 2);
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if (ret)
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return ret;
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ec_word = be16_to_cpu(ec_word);
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val->intval = ec_word * 100 / 256;
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break;
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case POWER_SUPPLY_PROP_TEMP_AMBIENT:
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ret = olpc_ec_cmd(EC_AMB_TEMP, NULL, 0, (void *)&ec_word, 2);
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if (ret)
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return ret;
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ec_word = be16_to_cpu(ec_word);
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val->intval = ec_word * 100 / 256;
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break;
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default:
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ret = -EINVAL;
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break;
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}
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return ret;
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}
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static enum power_supply_property olpc_bat_props[] = {
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POWER_SUPPLY_PROP_STATUS,
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POWER_SUPPLY_PROP_PRESENT,
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POWER_SUPPLY_PROP_HEALTH,
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POWER_SUPPLY_PROP_TECHNOLOGY,
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POWER_SUPPLY_PROP_VOLTAGE_AVG,
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POWER_SUPPLY_PROP_CURRENT_AVG,
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POWER_SUPPLY_PROP_CAPACITY,
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POWER_SUPPLY_PROP_CAPACITY_LEVEL,
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POWER_SUPPLY_PROP_TEMP,
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POWER_SUPPLY_PROP_TEMP_AMBIENT,
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POWER_SUPPLY_PROP_MANUFACTURER,
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};
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/*********************************************************************
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* Initialisation
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*********************************************************************/
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static struct platform_device *bat_pdev;
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static struct power_supply olpc_bat = {
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.properties = olpc_bat_props,
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.num_properties = ARRAY_SIZE(olpc_bat_props),
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.get_property = olpc_bat_get_property,
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.use_for_apm = 1,
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};
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void olpc_battery_trigger_uevent(unsigned long cause)
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{
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if (cause & EC_SCI_SRC_ACPWR)
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kobject_uevent(&olpc_ac.dev->kobj, KOBJ_CHANGE);
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if (cause & (EC_SCI_SRC_BATERR|EC_SCI_SRC_BATSOC|EC_SCI_SRC_BATTERY))
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kobject_uevent(&olpc_bat.dev->kobj, KOBJ_CHANGE);
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}
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static int __init olpc_bat_init(void)
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{
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int ret = 0;
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uint8_t status;
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if (!olpc_platform_info.ecver)
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return -ENXIO;
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if (olpc_platform_info.ecver < 0x43) {
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printk(KERN_NOTICE "OLPC EC version 0x%02x too old for battery driver.\n", olpc_platform_info.ecver);
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return -ENXIO;
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}
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ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &status, 1);
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if (ret)
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return ret;
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/* Ignore the status. It doesn't actually matter */
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bat_pdev = platform_device_register_simple("olpc-battery", 0, NULL, 0);
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if (IS_ERR(bat_pdev))
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return PTR_ERR(bat_pdev);
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ret = power_supply_register(&bat_pdev->dev, &olpc_ac);
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if (ret)
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goto ac_failed;
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olpc_bat.name = bat_pdev->name;
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ret = power_supply_register(&bat_pdev->dev, &olpc_bat);
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if (ret)
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goto battery_failed;
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olpc_register_battery_callback(&olpc_battery_trigger_uevent);
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goto success;
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battery_failed:
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power_supply_unregister(&olpc_ac);
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ac_failed:
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platform_device_unregister(bat_pdev);
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success:
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return ret;
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}
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static void __exit olpc_bat_exit(void)
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{
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olpc_deregister_battery_callback();
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power_supply_unregister(&olpc_bat);
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power_supply_unregister(&olpc_ac);
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platform_device_unregister(bat_pdev);
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}
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module_init(olpc_bat_init);
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module_exit(olpc_bat_exit);
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MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Battery driver for One Laptop Per Child 'XO' machine");
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