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290 lines
7.6 KiB
290 lines
7.6 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Power supply driver for the goldfish emulator |
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* |
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* Copyright (C) 2008 Google, Inc. |
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* Copyright (C) 2012 Intel, Inc. |
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* Copyright (C) 2013 Intel, Inc. |
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* Author: Mike Lockwood <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/err.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/types.h> |
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#include <linux/pci.h> |
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#include <linux/interrupt.h> |
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#include <linux/io.h> |
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#include <linux/acpi.h> |
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struct goldfish_battery_data { |
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void __iomem *reg_base; |
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int irq; |
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spinlock_t lock; |
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struct power_supply *battery; |
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struct power_supply *ac; |
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}; |
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#define GOLDFISH_BATTERY_READ(data, addr) \ |
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(readl(data->reg_base + addr)) |
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#define GOLDFISH_BATTERY_WRITE(data, addr, x) \ |
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(writel(x, data->reg_base + addr)) |
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enum { |
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/* status register */ |
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BATTERY_INT_STATUS = 0x00, |
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/* set this to enable IRQ */ |
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BATTERY_INT_ENABLE = 0x04, |
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BATTERY_AC_ONLINE = 0x08, |
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BATTERY_STATUS = 0x0C, |
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BATTERY_HEALTH = 0x10, |
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BATTERY_PRESENT = 0x14, |
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BATTERY_CAPACITY = 0x18, |
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BATTERY_VOLTAGE = 0x1C, |
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BATTERY_TEMP = 0x20, |
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BATTERY_CHARGE_COUNTER = 0x24, |
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BATTERY_VOLTAGE_MAX = 0x28, |
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BATTERY_CURRENT_MAX = 0x2C, |
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BATTERY_CURRENT_NOW = 0x30, |
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BATTERY_CURRENT_AVG = 0x34, |
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BATTERY_CHARGE_FULL_UAH = 0x38, |
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BATTERY_CYCLE_COUNT = 0x40, |
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BATTERY_STATUS_CHANGED = 1U << 0, |
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AC_STATUS_CHANGED = 1U << 1, |
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BATTERY_INT_MASK = BATTERY_STATUS_CHANGED | AC_STATUS_CHANGED, |
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}; |
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static int goldfish_ac_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 goldfish_battery_data *data = power_supply_get_drvdata(psy); |
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int ret = 0; |
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switch (psp) { |
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case POWER_SUPPLY_PROP_ONLINE: |
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val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_AC_ONLINE); |
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break; |
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case POWER_SUPPLY_PROP_VOLTAGE_MAX: |
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val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_VOLTAGE_MAX); |
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break; |
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case POWER_SUPPLY_PROP_CURRENT_MAX: |
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val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_CURRENT_MAX); |
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break; |
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default: |
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ret = -EINVAL; |
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break; |
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} |
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return ret; |
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} |
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static int goldfish_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 goldfish_battery_data *data = power_supply_get_drvdata(psy); |
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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 = GOLDFISH_BATTERY_READ(data, BATTERY_STATUS); |
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break; |
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case POWER_SUPPLY_PROP_HEALTH: |
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val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_HEALTH); |
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break; |
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case POWER_SUPPLY_PROP_PRESENT: |
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val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_PRESENT); |
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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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val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_CAPACITY); |
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break; |
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case POWER_SUPPLY_PROP_VOLTAGE_NOW: |
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val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_VOLTAGE); |
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break; |
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case POWER_SUPPLY_PROP_TEMP: |
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val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_TEMP); |
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break; |
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case POWER_SUPPLY_PROP_CHARGE_COUNTER: |
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val->intval = GOLDFISH_BATTERY_READ(data, |
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BATTERY_CHARGE_COUNTER); |
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break; |
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case POWER_SUPPLY_PROP_CURRENT_NOW: |
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val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_CURRENT_NOW); |
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break; |
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case POWER_SUPPLY_PROP_CURRENT_AVG: |
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val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_CURRENT_AVG); |
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break; |
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case POWER_SUPPLY_PROP_CHARGE_FULL: |
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val->intval = GOLDFISH_BATTERY_READ(data, |
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BATTERY_CHARGE_FULL_UAH); |
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break; |
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case POWER_SUPPLY_PROP_CYCLE_COUNT: |
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val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_CYCLE_COUNT); |
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break; |
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default: |
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ret = -EINVAL; |
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break; |
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} |
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return ret; |
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} |
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static enum power_supply_property goldfish_battery_props[] = { |
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POWER_SUPPLY_PROP_STATUS, |
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POWER_SUPPLY_PROP_HEALTH, |
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POWER_SUPPLY_PROP_PRESENT, |
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POWER_SUPPLY_PROP_TECHNOLOGY, |
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POWER_SUPPLY_PROP_CAPACITY, |
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POWER_SUPPLY_PROP_VOLTAGE_NOW, |
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POWER_SUPPLY_PROP_TEMP, |
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POWER_SUPPLY_PROP_CHARGE_COUNTER, |
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POWER_SUPPLY_PROP_CURRENT_NOW, |
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POWER_SUPPLY_PROP_CURRENT_AVG, |
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POWER_SUPPLY_PROP_CHARGE_FULL, |
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POWER_SUPPLY_PROP_CYCLE_COUNT, |
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}; |
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static enum power_supply_property goldfish_ac_props[] = { |
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POWER_SUPPLY_PROP_ONLINE, |
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POWER_SUPPLY_PROP_VOLTAGE_MAX, |
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POWER_SUPPLY_PROP_CURRENT_MAX, |
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}; |
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static irqreturn_t goldfish_battery_interrupt(int irq, void *dev_id) |
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{ |
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unsigned long irq_flags; |
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struct goldfish_battery_data *data = dev_id; |
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uint32_t status; |
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spin_lock_irqsave(&data->lock, irq_flags); |
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/* read status flags, which will clear the interrupt */ |
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status = GOLDFISH_BATTERY_READ(data, BATTERY_INT_STATUS); |
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status &= BATTERY_INT_MASK; |
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if (status & BATTERY_STATUS_CHANGED) |
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power_supply_changed(data->battery); |
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if (status & AC_STATUS_CHANGED) |
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power_supply_changed(data->ac); |
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spin_unlock_irqrestore(&data->lock, irq_flags); |
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return status ? IRQ_HANDLED : IRQ_NONE; |
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} |
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static const struct power_supply_desc battery_desc = { |
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.properties = goldfish_battery_props, |
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.num_properties = ARRAY_SIZE(goldfish_battery_props), |
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.get_property = goldfish_battery_get_property, |
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.name = "battery", |
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.type = POWER_SUPPLY_TYPE_BATTERY, |
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}; |
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static const struct power_supply_desc ac_desc = { |
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.properties = goldfish_ac_props, |
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.num_properties = ARRAY_SIZE(goldfish_ac_props), |
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.get_property = goldfish_ac_get_property, |
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.name = "ac", |
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.type = POWER_SUPPLY_TYPE_MAINS, |
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}; |
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static int goldfish_battery_probe(struct platform_device *pdev) |
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{ |
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int ret; |
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struct resource *r; |
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struct goldfish_battery_data *data; |
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struct power_supply_config psy_cfg = {}; |
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data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); |
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if (data == NULL) |
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return -ENOMEM; |
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spin_lock_init(&data->lock); |
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r = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
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if (r == NULL) { |
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dev_err(&pdev->dev, "platform_get_resource failed\n"); |
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return -ENODEV; |
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} |
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data->reg_base = devm_ioremap(&pdev->dev, r->start, resource_size(r)); |
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if (data->reg_base == NULL) { |
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dev_err(&pdev->dev, "unable to remap MMIO\n"); |
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return -ENOMEM; |
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} |
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data->irq = platform_get_irq(pdev, 0); |
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if (data->irq < 0) { |
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dev_err(&pdev->dev, "platform_get_irq failed\n"); |
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return -ENODEV; |
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} |
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ret = devm_request_irq(&pdev->dev, data->irq, |
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goldfish_battery_interrupt, |
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IRQF_SHARED, pdev->name, data); |
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if (ret) |
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return ret; |
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psy_cfg.drv_data = data; |
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data->ac = power_supply_register(&pdev->dev, &ac_desc, &psy_cfg); |
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if (IS_ERR(data->ac)) |
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return PTR_ERR(data->ac); |
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data->battery = power_supply_register(&pdev->dev, &battery_desc, |
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&psy_cfg); |
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if (IS_ERR(data->battery)) { |
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power_supply_unregister(data->ac); |
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return PTR_ERR(data->battery); |
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} |
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platform_set_drvdata(pdev, data); |
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GOLDFISH_BATTERY_WRITE(data, BATTERY_INT_ENABLE, BATTERY_INT_MASK); |
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return 0; |
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} |
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static int goldfish_battery_remove(struct platform_device *pdev) |
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{ |
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struct goldfish_battery_data *data = platform_get_drvdata(pdev); |
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power_supply_unregister(data->battery); |
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power_supply_unregister(data->ac); |
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return 0; |
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} |
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static const struct of_device_id goldfish_battery_of_match[] = { |
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{ .compatible = "google,goldfish-battery", }, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, goldfish_battery_of_match); |
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#ifdef CONFIG_ACPI |
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static const struct acpi_device_id goldfish_battery_acpi_match[] = { |
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{ "GFSH0001", 0 }, |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(acpi, goldfish_battery_acpi_match); |
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#endif |
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static struct platform_driver goldfish_battery_device = { |
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.probe = goldfish_battery_probe, |
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.remove = goldfish_battery_remove, |
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.driver = { |
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.name = "goldfish-battery", |
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.of_match_table = goldfish_battery_of_match, |
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.acpi_match_table = ACPI_PTR(goldfish_battery_acpi_match), |
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} |
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}; |
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module_platform_driver(goldfish_battery_device); |
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MODULE_AUTHOR("Mike Lockwood [email protected]"); |
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MODULE_LICENSE("GPL"); |
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MODULE_DESCRIPTION("Battery driver for the Goldfish emulator");
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