diff options
Diffstat (limited to 'drivers/power/charger-manager.c')
| -rw-r--r-- | drivers/power/charger-manager.c | 161 |
1 files changed, 120 insertions, 41 deletions
diff --git a/drivers/power/charger-manager.c b/drivers/power/charger-manager.c index 7287c0efd6bf..6b68d158e3c1 100644 --- a/drivers/power/charger-manager.c +++ b/drivers/power/charger-manager.c @@ -25,12 +25,22 @@ #include <linux/power/charger-manager.h> #include <linux/regulator/consumer.h> #include <linux/sysfs.h> +#include <linux/thermal.h> + +/* + * Default termperature threshold for charging. + * Every temperature units are in tenth of centigrade. + */ +#define CM_DEFAULT_RECHARGE_TEMP_DIFF 50 +#define CM_DEFAULT_CHARGE_TEMP_MAX 500 static const char * const default_event_names[] = { [CM_EVENT_UNKNOWN] = "Unknown", [CM_EVENT_BATT_FULL] = "Battery Full", [CM_EVENT_BATT_IN] = "Battery Inserted", [CM_EVENT_BATT_OUT] = "Battery Pulled Out", + [CM_EVENT_BATT_OVERHEAT] = "Battery Overheat", + [CM_EVENT_BATT_COLD] = "Battery Cold", [CM_EVENT_EXT_PWR_IN_OUT] = "External Power Attach/Detach", [CM_EVENT_CHG_START_STOP] = "Charging Start/Stop", [CM_EVENT_OTHERS] = "Other battery events" @@ -540,6 +550,60 @@ static int check_charging_duration(struct charger_manager *cm) return ret; } +static int cm_get_battery_temperature(struct charger_manager *cm, + int *temp) +{ + int ret; + + if (!cm->desc->measure_battery_temp) + return -ENODEV; + +#ifdef CONFIG_THERMAL + ret = thermal_zone_get_temp(cm->tzd_batt, (unsigned long *)temp); + if (!ret) + /* Calibrate temperature unit */ + *temp /= 100; +#else + ret = cm->fuel_gauge->get_property(cm->fuel_gauge, + POWER_SUPPLY_PROP_TEMP, + (union power_supply_propval *)temp); +#endif + return ret; +} + +static int cm_check_thermal_status(struct charger_manager *cm) +{ + struct charger_desc *desc = cm->desc; + int temp, upper_limit, lower_limit; + int ret = 0; + + ret = cm_get_battery_temperature(cm, &temp); + if (ret) { + /* FIXME: + * No information of battery temperature might + * occur hazadous result. We have to handle it + * depending on battery type. + */ + dev_err(cm->dev, "Failed to get battery temperature\n"); + return 0; + } + + upper_limit = desc->temp_max; + lower_limit = desc->temp_min; + + if (cm->emergency_stop) { + upper_limit -= desc->temp_diff; + lower_limit += desc->temp_diff; + } + + if (temp > upper_limit) + ret = CM_EVENT_BATT_OVERHEAT; + else if (temp < lower_limit) + ret = CM_EVENT_BATT_COLD; + + return ret; +} + /** * _cm_monitor - Monitor the temperature and return true for exceptions. * @cm: the Charger Manager representing the battery. @@ -549,28 +613,22 @@ static int check_charging_duration(struct charger_manager *cm) */ static bool _cm_monitor(struct charger_manager *cm) { - struct charger_desc *desc = cm->desc; - int temp = desc->temperature_out_of_range(&cm->last_temp_mC); + int temp_alrt; - dev_dbg(cm->dev, "monitoring (%2.2d.%3.3dC)\n", - cm->last_temp_mC / 1000, cm->last_temp_mC % 1000); + temp_alrt = cm_check_thermal_status(cm); /* It has been stopped already */ - if (temp && cm->emergency_stop) + if (temp_alrt && cm->emergency_stop) return false; /* * Check temperature whether overheat or cold. * If temperature is out of range normal state, stop charging. */ - if (temp) { - cm->emergency_stop = temp; - if (!try_charger_enable(cm, false)) { - if (temp > 0) - uevent_notify(cm, "OVERHEAT"); - else - uevent_notify(cm, "COLD"); - } + if (temp_alrt) { + cm->emergency_stop = temp_alrt; + if (!try_charger_enable(cm, false)) + uevent_notify(cm, default_event_names[temp_alrt]); /* * Check whole charging duration and discharing duration @@ -802,21 +860,8 @@ static int charger_get_property(struct power_supply *psy, POWER_SUPPLY_PROP_CURRENT_NOW, val); break; case POWER_SUPPLY_PROP_TEMP: - /* in thenth of centigrade */ - if (cm->last_temp_mC == INT_MIN) - desc->temperature_out_of_range(&cm->last_temp_mC); - val->intval = cm->last_temp_mC / 100; - if (!desc->measure_battery_temp) - ret = -ENODEV; - break; case POWER_SUPPLY_PROP_TEMP_AMBIENT: - /* in thenth of centigrade */ - if (cm->last_temp_mC == INT_MIN) - desc->temperature_out_of_range(&cm->last_temp_mC); - val->intval = cm->last_temp_mC / 100; - if (desc->measure_battery_temp) - ret = -ENODEV; - break; + return cm_get_battery_temperature(cm, &val->intval); case POWER_SUPPLY_PROP_CAPACITY: if (!cm->fuel_gauge) { ret = -ENODEV; @@ -1439,6 +1484,50 @@ err: return ret; } +static int cm_init_thermal_data(struct charger_manager *cm) +{ + struct charger_desc *desc = cm->desc; + union power_supply_propval val; + int ret; + + /* Verify whether fuel gauge provides battery temperature */ + ret = cm->fuel_gauge->get_property(cm->fuel_gauge, + POWER_SUPPLY_PROP_TEMP, &val); + + if (!ret) { + cm->charger_psy.properties[cm->charger_psy.num_properties] = + POWER_SUPPLY_PROP_TEMP; + cm->charger_psy.num_properties++; + cm->desc->measure_battery_temp = true; + } +#ifdef CONFIG_THERMAL + cm->tzd_batt = cm->fuel_gauge->tzd; + + if (ret && desc->thermal_zone) { + cm->tzd_batt = + thermal_zone_get_zone_by_name(desc->thermal_zone); + if (IS_ERR(cm->tzd_batt)) + return PTR_ERR(cm->tzd_batt); + + /* Use external thermometer */ + cm->charger_psy.properties[cm->charger_psy.num_properties] = + POWER_SUPPLY_PROP_TEMP_AMBIENT; + cm->charger_psy.num_properties++; + cm->desc->measure_battery_temp = true; + ret = 0; + } +#endif + if (cm->desc->measure_battery_temp) { + /* NOTICE : Default allowable minimum charge temperature is 0 */ + if (!desc->temp_max) + desc->temp_max = CM_DEFAULT_CHARGE_TEMP_MAX; + if (!desc->temp_diff) + desc->temp_diff = CM_DEFAULT_RECHARGE_TEMP_DIFF; + } + + return ret; +} + static int charger_manager_probe(struct platform_device *pdev) { struct charger_desc *desc = dev_get_platdata(&pdev->dev); @@ -1470,7 +1559,6 @@ static int charger_manager_probe(struct platform_device *pdev) /* Basic Values. Unspecified are Null or 0 */ cm->dev = &pdev->dev; cm->desc = desc; - cm->last_temp_mC = INT_MIN; /* denotes "unmeasured, yet" */ /* * The following two do not need to be errors. @@ -1533,11 +1621,6 @@ static int charger_manager_probe(struct platform_device *pdev) return -EINVAL; } - if (!desc->temperature_out_of_range) { - dev_err(&pdev->dev, "there is no temperature_out_of_range\n"); - return -EINVAL; - } - if (!desc->charging_max_duration_ms || !desc->discharging_max_duration_ms) { dev_info(&pdev->dev, "Cannot limit charging duration checking mechanism to prevent overcharge/overheat and control discharging duration\n"); @@ -1583,14 +1666,10 @@ static int charger_manager_probe(struct platform_device *pdev) cm->charger_psy.num_properties++; } - if (desc->measure_battery_temp) { - cm->charger_psy.properties[cm->charger_psy.num_properties] = - POWER_SUPPLY_PROP_TEMP; - cm->charger_psy.num_properties++; - } else { - cm->charger_psy.properties[cm->charger_psy.num_properties] = - POWER_SUPPLY_PROP_TEMP_AMBIENT; - cm->charger_psy.num_properties++; + ret = cm_init_thermal_data(cm); + if (ret) { + dev_err(&pdev->dev, "Failed to initialize thermal data\n"); + cm->desc->measure_battery_temp = false; } INIT_DELAYED_WORK(&cm->fullbatt_vchk_work, fullbatt_vchk); |