298 строки
7.0 KiB
C
298 строки
7.0 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Battery driver for Acer Iconia Tab A500.
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*
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* Copyright 2020 GRATE-driver project.
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*
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* Based on downstream driver from Acer Inc.
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* Based on NVIDIA Gas Gauge driver for SBS Compliant Batteries.
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*
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* Copyright (c) 2010, NVIDIA Corporation.
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*/
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#include <linux/module.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/regmap.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/workqueue.h>
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enum {
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REG_CAPACITY,
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REG_VOLTAGE,
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REG_CURRENT,
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REG_DESIGN_CAPACITY,
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REG_TEMPERATURE,
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};
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#define EC_DATA(_reg, _psp) { \
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.psp = POWER_SUPPLY_PROP_ ## _psp, \
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.reg = _reg, \
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}
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static const struct battery_register {
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enum power_supply_property psp;
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unsigned int reg;
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} ec_data[] = {
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[REG_CAPACITY] = EC_DATA(0x00, CAPACITY),
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[REG_VOLTAGE] = EC_DATA(0x01, VOLTAGE_NOW),
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[REG_CURRENT] = EC_DATA(0x03, CURRENT_NOW),
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[REG_DESIGN_CAPACITY] = EC_DATA(0x08, CHARGE_FULL_DESIGN),
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[REG_TEMPERATURE] = EC_DATA(0x0a, TEMP),
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};
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static const enum power_supply_property a500_battery_properties[] = {
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POWER_SUPPLY_PROP_CAPACITY,
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POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
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POWER_SUPPLY_PROP_CURRENT_NOW,
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POWER_SUPPLY_PROP_PRESENT,
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POWER_SUPPLY_PROP_STATUS,
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POWER_SUPPLY_PROP_TECHNOLOGY,
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POWER_SUPPLY_PROP_TEMP,
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POWER_SUPPLY_PROP_VOLTAGE_NOW,
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};
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struct a500_battery {
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struct delayed_work poll_work;
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struct power_supply *psy;
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struct regmap *regmap;
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unsigned int capacity;
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};
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static bool a500_battery_update_capacity(struct a500_battery *bat)
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{
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unsigned int capacity;
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int err;
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err = regmap_read(bat->regmap, ec_data[REG_CAPACITY].reg, &capacity);
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if (err)
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return false;
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/* capacity can be >100% even if max value is 100% */
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capacity = min(capacity, 100u);
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if (bat->capacity != capacity) {
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bat->capacity = capacity;
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return true;
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}
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return false;
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}
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static int a500_battery_get_status(struct a500_battery *bat)
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{
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if (bat->capacity < 100) {
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if (power_supply_am_i_supplied(bat->psy))
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return POWER_SUPPLY_STATUS_CHARGING;
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else
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return POWER_SUPPLY_STATUS_DISCHARGING;
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}
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return POWER_SUPPLY_STATUS_FULL;
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}
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static void a500_battery_unit_adjustment(struct device *dev,
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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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const unsigned int base_unit_conversion = 1000;
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const unsigned int temp_kelvin_to_celsius = 2731;
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switch (psp) {
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case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
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case POWER_SUPPLY_PROP_CURRENT_NOW:
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case POWER_SUPPLY_PROP_VOLTAGE_NOW:
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val->intval *= base_unit_conversion;
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break;
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case POWER_SUPPLY_PROP_TEMP:
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val->intval -= temp_kelvin_to_celsius;
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break;
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case POWER_SUPPLY_PROP_PRESENT:
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val->intval = !!val->intval;
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break;
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default:
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dev_dbg(dev,
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"%s: no need for unit conversion %d\n", __func__, psp);
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}
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}
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static int a500_battery_get_ec_data_index(struct device *dev,
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enum power_supply_property psp)
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{
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unsigned int i;
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/*
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* DESIGN_CAPACITY register always returns a non-zero value if
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* battery is connected and zero if disconnected, hence we'll use
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* it for judging the battery presence.
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*/
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if (psp == POWER_SUPPLY_PROP_PRESENT)
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psp = POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN;
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for (i = 0; i < ARRAY_SIZE(ec_data); i++)
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if (psp == ec_data[i].psp)
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return i;
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dev_dbg(dev, "%s: invalid property %u\n", __func__, psp);
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return -EINVAL;
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}
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static int a500_battery_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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struct a500_battery *bat = power_supply_get_drvdata(psy);
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struct device *dev = psy->dev.parent;
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int ret = 0;
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switch (psp) {
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case POWER_SUPPLY_PROP_STATUS:
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val->intval = a500_battery_get_status(bat);
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break;
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case POWER_SUPPLY_PROP_TECHNOLOGY:
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val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
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break;
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case POWER_SUPPLY_PROP_CAPACITY:
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a500_battery_update_capacity(bat);
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val->intval = bat->capacity;
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break;
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case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
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case POWER_SUPPLY_PROP_CURRENT_NOW:
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case POWER_SUPPLY_PROP_VOLTAGE_NOW:
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case POWER_SUPPLY_PROP_PRESENT:
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case POWER_SUPPLY_PROP_TEMP:
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ret = a500_battery_get_ec_data_index(dev, psp);
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if (ret < 0)
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break;
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ret = regmap_read(bat->regmap, ec_data[ret].reg, &val->intval);
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break;
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default:
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dev_err(dev, "%s: invalid property %u\n", __func__, psp);
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return -EINVAL;
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}
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if (!ret) {
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/* convert units to match requirements of power supply class */
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a500_battery_unit_adjustment(dev, psp, val);
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}
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dev_dbg(dev, "%s: property = %d, value = %x\n",
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__func__, psp, val->intval);
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/* return NODATA for properties if battery not presents */
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if (ret)
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return -ENODATA;
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return 0;
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}
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static void a500_battery_poll_work(struct work_struct *work)
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{
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struct a500_battery *bat;
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bool capacity_changed;
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bat = container_of(work, struct a500_battery, poll_work.work);
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capacity_changed = a500_battery_update_capacity(bat);
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if (capacity_changed)
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power_supply_changed(bat->psy);
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/* continuously send uevent notification */
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schedule_delayed_work(&bat->poll_work, 30 * HZ);
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}
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static const struct power_supply_desc a500_battery_desc = {
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.name = "ec-battery",
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.type = POWER_SUPPLY_TYPE_BATTERY,
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.properties = a500_battery_properties,
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.get_property = a500_battery_get_property,
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.num_properties = ARRAY_SIZE(a500_battery_properties),
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.external_power_changed = power_supply_changed,
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};
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static int a500_battery_probe(struct platform_device *pdev)
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{
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struct power_supply_config psy_cfg = {};
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struct a500_battery *bat;
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bat = devm_kzalloc(&pdev->dev, sizeof(*bat), GFP_KERNEL);
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if (!bat)
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return -ENOMEM;
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platform_set_drvdata(pdev, bat);
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psy_cfg.of_node = pdev->dev.parent->of_node;
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psy_cfg.drv_data = bat;
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bat->regmap = dev_get_regmap(pdev->dev.parent, "KB930");
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if (!bat->regmap)
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return -EINVAL;
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bat->psy = devm_power_supply_register_no_ws(&pdev->dev,
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&a500_battery_desc,
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&psy_cfg);
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if (IS_ERR(bat->psy))
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return dev_err_probe(&pdev->dev, PTR_ERR(bat->psy),
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"failed to register battery\n");
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INIT_DELAYED_WORK(&bat->poll_work, a500_battery_poll_work);
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schedule_delayed_work(&bat->poll_work, HZ);
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return 0;
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}
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static int a500_battery_remove(struct platform_device *pdev)
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{
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struct a500_battery *bat = dev_get_drvdata(&pdev->dev);
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cancel_delayed_work_sync(&bat->poll_work);
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return 0;
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}
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static int __maybe_unused a500_battery_suspend(struct device *dev)
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{
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struct a500_battery *bat = dev_get_drvdata(dev);
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cancel_delayed_work_sync(&bat->poll_work);
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return 0;
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}
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static int __maybe_unused a500_battery_resume(struct device *dev)
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{
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struct a500_battery *bat = dev_get_drvdata(dev);
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schedule_delayed_work(&bat->poll_work, HZ);
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return 0;
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}
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static SIMPLE_DEV_PM_OPS(a500_battery_pm_ops,
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a500_battery_suspend, a500_battery_resume);
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static struct platform_driver a500_battery_driver = {
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.driver = {
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.name = "acer-a500-iconia-battery",
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.pm = &a500_battery_pm_ops,
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},
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.probe = a500_battery_probe,
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.remove = a500_battery_remove,
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};
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module_platform_driver(a500_battery_driver);
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MODULE_DESCRIPTION("Battery gauge driver for Acer Iconia Tab A500");
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MODULE_AUTHOR("Dmitry Osipenko <digetx@gmail.com>");
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MODULE_ALIAS("platform:acer-a500-iconia-battery");
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MODULE_LICENSE("GPL");
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