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297 lines
7.0 KiB
297 lines
7.0 KiB
// 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 <[email protected]>"); |
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MODULE_ALIAS("platform:acer-a500-iconia-battery"); |
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MODULE_LICENSE("GPL");
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