--- /dev/null
+/*
+ * 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");
Code Review / kvmfornfv.git / blobdiff