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- /*
- * nvec_power: power supply driver for a NVIDIA compliant embedded controller
- *
- * Copyright (C) 2011 The AC100 Kernel Team <ac100@lists.launchpad.net>
- *
- * Authors: Ilya Petrov <ilya.muromec@gmail.com>
- * Marc Dietrich <marvin24@gmx.de>
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- */
- #include <linux/module.h>
- #include <linux/platform_device.h>
- #include <linux/err.h>
- #include <linux/power_supply.h>
- #include <linux/slab.h>
- #include <linux/workqueue.h>
- #include <linux/delay.h>
- #include "nvec.h"
- #define GET_SYSTEM_STATUS 0x00
- struct nvec_power {
- struct notifier_block notifier;
- struct delayed_work poller;
- struct nvec_chip *nvec;
- int on;
- int bat_present;
- int bat_status;
- int bat_voltage_now;
- int bat_current_now;
- int bat_current_avg;
- int time_remain;
- int charge_full_design;
- int charge_last_full;
- int critical_capacity;
- int capacity_remain;
- int bat_temperature;
- int bat_cap;
- int bat_type_enum;
- char bat_manu[30];
- char bat_model[30];
- char bat_type[30];
- };
- enum {
- SLOT_STATUS,
- VOLTAGE,
- TIME_REMAINING,
- CURRENT,
- AVERAGE_CURRENT,
- AVERAGING_TIME_INTERVAL,
- CAPACITY_REMAINING,
- LAST_FULL_CHARGE_CAPACITY,
- DESIGN_CAPACITY,
- CRITICAL_CAPACITY,
- TEMPERATURE,
- MANUFACTURER,
- MODEL,
- TYPE,
- };
- enum {
- AC,
- BAT,
- };
- struct bat_response {
- u8 event_type;
- u8 length;
- u8 sub_type;
- u8 status;
- /* payload */
- union {
- char plc[30];
- u16 plu;
- s16 pls;
- };
- };
- static struct power_supply *nvec_bat_psy;
- static struct power_supply *nvec_psy;
- static int nvec_power_notifier(struct notifier_block *nb,
- unsigned long event_type, void *data)
- {
- struct nvec_power *power =
- container_of(nb, struct nvec_power, notifier);
- struct bat_response *res = (struct bat_response *)data;
- if (event_type != NVEC_SYS)
- return NOTIFY_DONE;
- if (res->sub_type == 0) {
- if (power->on != res->plu) {
- power->on = res->plu;
- power_supply_changed(nvec_psy);
- }
- return NOTIFY_STOP;
- }
- return NOTIFY_OK;
- }
- static const int bat_init[] = {
- LAST_FULL_CHARGE_CAPACITY, DESIGN_CAPACITY, CRITICAL_CAPACITY,
- MANUFACTURER, MODEL, TYPE,
- };
- static void get_bat_mfg_data(struct nvec_power *power)
- {
- int i;
- char buf[] = { NVEC_BAT, SLOT_STATUS };
- for (i = 0; i < ARRAY_SIZE(bat_init); i++) {
- buf[1] = bat_init[i];
- nvec_write_async(power->nvec, buf, 2);
- }
- }
- static int nvec_power_bat_notifier(struct notifier_block *nb,
- unsigned long event_type, void *data)
- {
- struct nvec_power *power =
- container_of(nb, struct nvec_power, notifier);
- struct bat_response *res = (struct bat_response *)data;
- int status_changed = 0;
- if (event_type != NVEC_BAT)
- return NOTIFY_DONE;
- switch (res->sub_type) {
- case SLOT_STATUS:
- if (res->plc[0] & 1) {
- if (power->bat_present == 0) {
- status_changed = 1;
- get_bat_mfg_data(power);
- }
- power->bat_present = 1;
- switch ((res->plc[0] >> 1) & 3) {
- case 0:
- power->bat_status =
- POWER_SUPPLY_STATUS_NOT_CHARGING;
- break;
- case 1:
- power->bat_status =
- POWER_SUPPLY_STATUS_CHARGING;
- break;
- case 2:
- power->bat_status =
- POWER_SUPPLY_STATUS_DISCHARGING;
- break;
- default:
- power->bat_status = POWER_SUPPLY_STATUS_UNKNOWN;
- }
- } else {
- if (power->bat_present == 1)
- status_changed = 1;
- power->bat_present = 0;
- power->bat_status = POWER_SUPPLY_STATUS_UNKNOWN;
- }
- power->bat_cap = res->plc[1];
- if (status_changed)
- power_supply_changed(nvec_bat_psy);
- break;
- case VOLTAGE:
- power->bat_voltage_now = res->plu * 1000;
- break;
- case TIME_REMAINING:
- power->time_remain = res->plu * 3600;
- break;
- case CURRENT:
- power->bat_current_now = res->pls * 1000;
- break;
- case AVERAGE_CURRENT:
- power->bat_current_avg = res->pls * 1000;
- break;
- case CAPACITY_REMAINING:
- power->capacity_remain = res->plu * 1000;
- break;
- case LAST_FULL_CHARGE_CAPACITY:
- power->charge_last_full = res->plu * 1000;
- break;
- case DESIGN_CAPACITY:
- power->charge_full_design = res->plu * 1000;
- break;
- case CRITICAL_CAPACITY:
- power->critical_capacity = res->plu * 1000;
- break;
- case TEMPERATURE:
- power->bat_temperature = res->plu - 2732;
- break;
- case MANUFACTURER:
- memcpy(power->bat_manu, &res->plc, res->length - 2);
- power->bat_model[res->length - 2] = '\0';
- break;
- case MODEL:
- memcpy(power->bat_model, &res->plc, res->length - 2);
- power->bat_model[res->length - 2] = '\0';
- break;
- case TYPE:
- memcpy(power->bat_type, &res->plc, res->length - 2);
- power->bat_type[res->length - 2] = '\0';
- /* this differs a little from the spec
- fill in more if you find some */
- if (!strncmp(power->bat_type, "Li", 30))
- power->bat_type_enum = POWER_SUPPLY_TECHNOLOGY_LION;
- else
- power->bat_type_enum = POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
- break;
- default:
- return NOTIFY_STOP;
- }
- return NOTIFY_STOP;
- }
- static int nvec_power_get_property(struct power_supply *psy,
- enum power_supply_property psp,
- union power_supply_propval *val)
- {
- struct nvec_power *power = dev_get_drvdata(psy->dev.parent);
- switch (psp) {
- case POWER_SUPPLY_PROP_ONLINE:
- val->intval = power->on;
- break;
- default:
- return -EINVAL;
- }
- return 0;
- }
- static int nvec_battery_get_property(struct power_supply *psy,
- enum power_supply_property psp,
- union power_supply_propval *val)
- {
- struct nvec_power *power = dev_get_drvdata(psy->dev.parent);
- switch (psp) {
- case POWER_SUPPLY_PROP_STATUS:
- val->intval = power->bat_status;
- break;
- case POWER_SUPPLY_PROP_CAPACITY:
- val->intval = power->bat_cap;
- break;
- case POWER_SUPPLY_PROP_PRESENT:
- val->intval = power->bat_present;
- break;
- case POWER_SUPPLY_PROP_VOLTAGE_NOW:
- val->intval = power->bat_voltage_now;
- break;
- case POWER_SUPPLY_PROP_CURRENT_NOW:
- val->intval = power->bat_current_now;
- break;
- case POWER_SUPPLY_PROP_CURRENT_AVG:
- val->intval = power->bat_current_avg;
- break;
- case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
- val->intval = power->time_remain;
- break;
- case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
- val->intval = power->charge_full_design;
- break;
- case POWER_SUPPLY_PROP_CHARGE_FULL:
- val->intval = power->charge_last_full;
- break;
- case POWER_SUPPLY_PROP_CHARGE_EMPTY:
- val->intval = power->critical_capacity;
- break;
- case POWER_SUPPLY_PROP_CHARGE_NOW:
- val->intval = power->capacity_remain;
- break;
- case POWER_SUPPLY_PROP_TEMP:
- val->intval = power->bat_temperature;
- break;
- case POWER_SUPPLY_PROP_MANUFACTURER:
- val->strval = power->bat_manu;
- break;
- case POWER_SUPPLY_PROP_MODEL_NAME:
- val->strval = power->bat_model;
- break;
- case POWER_SUPPLY_PROP_TECHNOLOGY:
- val->intval = power->bat_type_enum;
- break;
- default:
- return -EINVAL;
- }
- return 0;
- }
- static enum power_supply_property nvec_power_props[] = {
- POWER_SUPPLY_PROP_ONLINE,
- };
- static enum power_supply_property nvec_battery_props[] = {
- POWER_SUPPLY_PROP_STATUS,
- POWER_SUPPLY_PROP_PRESENT,
- POWER_SUPPLY_PROP_CAPACITY,
- POWER_SUPPLY_PROP_VOLTAGE_NOW,
- POWER_SUPPLY_PROP_CURRENT_NOW,
- #ifdef EC_FULL_DIAG
- POWER_SUPPLY_PROP_CURRENT_AVG,
- POWER_SUPPLY_PROP_TEMP,
- POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
- #endif
- POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
- POWER_SUPPLY_PROP_CHARGE_FULL,
- POWER_SUPPLY_PROP_CHARGE_EMPTY,
- POWER_SUPPLY_PROP_CHARGE_NOW,
- POWER_SUPPLY_PROP_MANUFACTURER,
- POWER_SUPPLY_PROP_MODEL_NAME,
- POWER_SUPPLY_PROP_TECHNOLOGY,
- };
- static char *nvec_power_supplied_to[] = {
- "battery",
- };
- static const struct power_supply_desc nvec_bat_psy_desc = {
- .name = "battery",
- .type = POWER_SUPPLY_TYPE_BATTERY,
- .properties = nvec_battery_props,
- .num_properties = ARRAY_SIZE(nvec_battery_props),
- .get_property = nvec_battery_get_property,
- };
- static const struct power_supply_desc nvec_psy_desc = {
- .name = "ac",
- .type = POWER_SUPPLY_TYPE_MAINS,
- .properties = nvec_power_props,
- .num_properties = ARRAY_SIZE(nvec_power_props),
- .get_property = nvec_power_get_property,
- };
- static int counter;
- static int const bat_iter[] = {
- SLOT_STATUS, VOLTAGE, CURRENT, CAPACITY_REMAINING,
- #ifdef EC_FULL_DIAG
- AVERAGE_CURRENT, TEMPERATURE, TIME_REMAINING,
- #endif
- };
- static void nvec_power_poll(struct work_struct *work)
- {
- char buf[] = { NVEC_SYS, GET_SYSTEM_STATUS };
- struct nvec_power *power = container_of(work, struct nvec_power,
- poller.work);
- if (counter >= ARRAY_SIZE(bat_iter))
- counter = 0;
- /* AC status via sys req */
- nvec_write_async(power->nvec, buf, 2);
- msleep(100);
- /* select a battery request function via round robin
- doing it all at once seems to overload the power supply */
- buf[0] = NVEC_BAT;
- buf[1] = bat_iter[counter++];
- nvec_write_async(power->nvec, buf, 2);
- schedule_delayed_work(to_delayed_work(work), msecs_to_jiffies(5000));
- };
- static int nvec_power_probe(struct platform_device *pdev)
- {
- struct power_supply **psy;
- const struct power_supply_desc *psy_desc;
- struct nvec_power *power;
- struct nvec_chip *nvec = dev_get_drvdata(pdev->dev.parent);
- struct power_supply_config psy_cfg = {};
- power = devm_kzalloc(&pdev->dev, sizeof(struct nvec_power), GFP_NOWAIT);
- if (!power)
- return -ENOMEM;
- dev_set_drvdata(&pdev->dev, power);
- power->nvec = nvec;
- switch (pdev->id) {
- case AC:
- psy = &nvec_psy;
- psy_desc = &nvec_psy_desc;
- psy_cfg.supplied_to = nvec_power_supplied_to;
- psy_cfg.num_supplicants = ARRAY_SIZE(nvec_power_supplied_to);
- power->notifier.notifier_call = nvec_power_notifier;
- INIT_DELAYED_WORK(&power->poller, nvec_power_poll);
- schedule_delayed_work(&power->poller, msecs_to_jiffies(5000));
- break;
- case BAT:
- psy = &nvec_bat_psy;
- psy_desc = &nvec_bat_psy_desc;
- power->notifier.notifier_call = nvec_power_bat_notifier;
- break;
- default:
- return -ENODEV;
- }
- nvec_register_notifier(nvec, &power->notifier, NVEC_SYS);
- if (pdev->id == BAT)
- get_bat_mfg_data(power);
- *psy = power_supply_register(&pdev->dev, psy_desc, &psy_cfg);
- return PTR_ERR_OR_ZERO(*psy);
- }
- static int nvec_power_remove(struct platform_device *pdev)
- {
- struct nvec_power *power = platform_get_drvdata(pdev);
- cancel_delayed_work_sync(&power->poller);
- nvec_unregister_notifier(power->nvec, &power->notifier);
- switch (pdev->id) {
- case AC:
- power_supply_unregister(nvec_psy);
- break;
- case BAT:
- power_supply_unregister(nvec_bat_psy);
- }
- return 0;
- }
- static struct platform_driver nvec_power_driver = {
- .probe = nvec_power_probe,
- .remove = nvec_power_remove,
- .driver = {
- .name = "nvec-power",
- }
- };
- module_platform_driver(nvec_power_driver);
- MODULE_AUTHOR("Ilya Petrov <ilya.muromec@gmail.com>");
- MODULE_LICENSE("GPL");
- MODULE_DESCRIPTION("NVEC battery and AC driver");
- MODULE_ALIAS("platform:nvec-power");
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