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* Battery measurement code for Ingenic JZ SOC.
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* Copyright (C) 2009 Jiejing Zhang <kzjeef@gmail.com>
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* Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
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* based on tosa_battery.c
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* Copyright (C) 2008 Marek Vasut <marek.vasut@gmail.com>
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/delay.h>
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#include <linux/gpio.h>
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#include <linux/mfd/core.h>
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#include <linux/power_supply.h>
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#include <linux/power/jz4740-battery.h>
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#include <linux/jz4740-adc.h>
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struct jz_battery_platform_data *pdata;
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struct platform_device *pdev;
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const struct mfd_cell *cell;
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struct completion read_completion;
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struct power_supply battery;
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struct delayed_work work;
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static inline struct jz_battery *psy_to_jz_battery(struct power_supply *psy)
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return container_of(psy, struct jz_battery, battery);
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static irqreturn_t jz_battery_irq_handler(int irq, void *devid)
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struct jz_battery *battery = devid;
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complete(&battery->read_completion);
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static long jz_battery_read_voltage(struct jz_battery *battery)
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mutex_lock(&battery->lock);
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INIT_COMPLETION(battery->read_completion);
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enable_irq(battery->irq);
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battery->cell->enable(battery->pdev);
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t = wait_for_completion_interruptible_timeout(&battery->read_completion,
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val = readw(battery->base) & 0xfff;
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if (battery->pdata->info.voltage_max_design <= 2500000)
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val = (val * 78125UL) >> 7UL;
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val = ((val * 924375UL) >> 9UL) + 33000;
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voltage = t ? t : -ETIMEDOUT;
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battery->cell->disable(battery->pdev);
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disable_irq(battery->irq);
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mutex_unlock(&battery->lock);
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static int jz_battery_get_capacity(struct power_supply *psy)
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struct jz_battery *jz_battery = psy_to_jz_battery(psy);
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struct power_supply_info *info = &jz_battery->pdata->info;
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voltage = jz_battery_read_voltage(jz_battery);
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voltage_span = info->voltage_max_design - info->voltage_min_design;
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ret = ((voltage - info->voltage_min_design) * 100) / voltage_span;
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static int jz_battery_get_property(struct power_supply *psy,
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enum power_supply_property psp, union power_supply_propval *val)
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struct jz_battery *jz_battery = psy_to_jz_battery(psy);
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struct power_supply_info *info = &jz_battery->pdata->info;
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case POWER_SUPPLY_PROP_STATUS:
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val->intval = jz_battery->status;
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case POWER_SUPPLY_PROP_TECHNOLOGY:
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val->intval = jz_battery->pdata->info.technology;
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case POWER_SUPPLY_PROP_HEALTH:
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voltage = jz_battery_read_voltage(jz_battery);
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if (voltage < info->voltage_min_design)
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val->intval = POWER_SUPPLY_HEALTH_DEAD;
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val->intval = POWER_SUPPLY_HEALTH_GOOD;
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case POWER_SUPPLY_PROP_CAPACITY:
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val->intval = jz_battery_get_capacity(psy);
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case POWER_SUPPLY_PROP_VOLTAGE_NOW:
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val->intval = jz_battery_read_voltage(jz_battery);
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case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
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val->intval = info->voltage_max_design;
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case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
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val->intval = info->voltage_min_design;
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case POWER_SUPPLY_PROP_PRESENT:
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static void jz_battery_external_power_changed(struct power_supply *psy)
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struct jz_battery *jz_battery = psy_to_jz_battery(psy);
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cancel_delayed_work(&jz_battery->work);
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schedule_delayed_work(&jz_battery->work, 0);
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static irqreturn_t jz_battery_charge_irq(int irq, void *data)
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struct jz_battery *jz_battery = data;
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cancel_delayed_work(&jz_battery->work);
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schedule_delayed_work(&jz_battery->work, 0);
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static void jz_battery_update(struct jz_battery *jz_battery)
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bool has_changed = false;
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if (gpio_is_valid(jz_battery->pdata->gpio_charge)) {
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is_charging = gpio_get_value(jz_battery->pdata->gpio_charge);
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is_charging ^= jz_battery->pdata->gpio_charge_active_low;
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status = POWER_SUPPLY_STATUS_CHARGING;
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status = POWER_SUPPLY_STATUS_NOT_CHARGING;
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if (status != jz_battery->status) {
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jz_battery->status = status;
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voltage = jz_battery_read_voltage(jz_battery);
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if (abs(voltage - jz_battery->voltage) < 50000) {
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jz_battery->voltage = voltage;
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power_supply_changed(&jz_battery->battery);
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static enum power_supply_property jz_battery_properties[] = {
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POWER_SUPPLY_PROP_STATUS,
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POWER_SUPPLY_PROP_TECHNOLOGY,
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POWER_SUPPLY_PROP_HEALTH,
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POWER_SUPPLY_PROP_CAPACITY,
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POWER_SUPPLY_PROP_VOLTAGE_NOW,
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POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
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POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
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POWER_SUPPLY_PROP_PRESENT,
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static void jz_battery_work(struct work_struct *work)
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/* Too small interval will increase system workload */
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const int interval = HZ * 30;
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struct jz_battery *jz_battery = container_of(work, struct jz_battery,
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jz_battery_update(jz_battery);
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schedule_delayed_work(&jz_battery->work, interval);
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static int __devinit jz_battery_probe(struct platform_device *pdev)
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struct jz_battery_platform_data *pdata = pdev->dev.parent->platform_data;
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struct jz_battery *jz_battery;
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struct power_supply *battery;
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dev_err(&pdev->dev, "No platform_data supplied\n");
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jz_battery = kzalloc(sizeof(*jz_battery), GFP_KERNEL);
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dev_err(&pdev->dev, "Failed to allocate driver structure\n");
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jz_battery->cell = mfd_get_cell(pdev);
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jz_battery->irq = platform_get_irq(pdev, 0);
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if (jz_battery->irq < 0) {
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ret = jz_battery->irq;
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dev_err(&pdev->dev, "Failed to get platform irq: %d\n", ret);
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jz_battery->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!jz_battery->mem) {
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dev_err(&pdev->dev, "Failed to get platform mmio resource\n");
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jz_battery->mem = request_mem_region(jz_battery->mem->start,
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resource_size(jz_battery->mem), pdev->name);
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if (!jz_battery->mem) {
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dev_err(&pdev->dev, "Failed to request mmio memory region\n");
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jz_battery->base = ioremap_nocache(jz_battery->mem->start,
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resource_size(jz_battery->mem));
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if (!jz_battery->base) {
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dev_err(&pdev->dev, "Failed to ioremap mmio memory\n");
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goto err_release_mem_region;
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battery = &jz_battery->battery;
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battery->name = pdata->info.name;
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battery->type = POWER_SUPPLY_TYPE_BATTERY;
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battery->properties = jz_battery_properties;
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battery->num_properties = ARRAY_SIZE(jz_battery_properties);
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battery->get_property = jz_battery_get_property;
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battery->external_power_changed = jz_battery_external_power_changed;
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battery->use_for_apm = 1;
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jz_battery->pdata = pdata;
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jz_battery->pdev = pdev;
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init_completion(&jz_battery->read_completion);
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mutex_init(&jz_battery->lock);
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INIT_DELAYED_WORK(&jz_battery->work, jz_battery_work);
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ret = request_irq(jz_battery->irq, jz_battery_irq_handler, 0, pdev->name,
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dev_err(&pdev->dev, "Failed to request irq %d\n", ret);
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disable_irq(jz_battery->irq);
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if (gpio_is_valid(pdata->gpio_charge)) {
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ret = gpio_request(pdata->gpio_charge, dev_name(&pdev->dev));
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dev_err(&pdev->dev, "charger state gpio request failed.\n");
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ret = gpio_direction_input(pdata->gpio_charge);
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dev_err(&pdev->dev, "charger state gpio set direction failed.\n");
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jz_battery->charge_irq = gpio_to_irq(pdata->gpio_charge);
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if (jz_battery->charge_irq >= 0) {
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ret = request_irq(jz_battery->charge_irq,
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jz_battery_charge_irq,
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IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
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dev_name(&pdev->dev), jz_battery);
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dev_err(&pdev->dev, "Failed to request charge irq: %d\n", ret);
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jz_battery->charge_irq = -1;
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if (jz_battery->pdata->info.voltage_max_design <= 2500000)
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jz4740_adc_set_config(pdev->dev.parent, JZ_ADC_CONFIG_BAT_MB,
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JZ_ADC_CONFIG_BAT_MB);
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jz4740_adc_set_config(pdev->dev.parent, JZ_ADC_CONFIG_BAT_MB, 0);
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ret = power_supply_register(&pdev->dev, &jz_battery->battery);
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dev_err(&pdev->dev, "power supply battery register failed.\n");
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goto err_free_charge_irq;
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platform_set_drvdata(pdev, jz_battery);
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schedule_delayed_work(&jz_battery->work, 0);
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if (jz_battery->charge_irq >= 0)
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free_irq(jz_battery->charge_irq, jz_battery);
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if (gpio_is_valid(pdata->gpio_charge))
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gpio_free(jz_battery->pdata->gpio_charge);
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free_irq(jz_battery->irq, jz_battery);
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platform_set_drvdata(pdev, NULL);
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iounmap(jz_battery->base);
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err_release_mem_region:
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release_mem_region(jz_battery->mem->start, resource_size(jz_battery->mem));
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static int __devexit jz_battery_remove(struct platform_device *pdev)
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struct jz_battery *jz_battery = platform_get_drvdata(pdev);
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cancel_delayed_work_sync(&jz_battery->work);
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if (gpio_is_valid(jz_battery->pdata->gpio_charge)) {
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if (jz_battery->charge_irq >= 0)
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free_irq(jz_battery->charge_irq, jz_battery);
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gpio_free(jz_battery->pdata->gpio_charge);
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power_supply_unregister(&jz_battery->battery);
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free_irq(jz_battery->irq, jz_battery);
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iounmap(jz_battery->base);
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release_mem_region(jz_battery->mem->start, resource_size(jz_battery->mem));
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static int jz_battery_suspend(struct device *dev)
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struct jz_battery *jz_battery = dev_get_drvdata(dev);
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cancel_delayed_work_sync(&jz_battery->work);
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jz_battery->status = POWER_SUPPLY_STATUS_UNKNOWN;
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static int jz_battery_resume(struct device *dev)
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struct jz_battery *jz_battery = dev_get_drvdata(dev);
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schedule_delayed_work(&jz_battery->work, 0);
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static const struct dev_pm_ops jz_battery_pm_ops = {
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.suspend = jz_battery_suspend,
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.resume = jz_battery_resume,
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#define JZ_BATTERY_PM_OPS (&jz_battery_pm_ops)
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#define JZ_BATTERY_PM_OPS NULL
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static struct platform_driver jz_battery_driver = {
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.probe = jz_battery_probe,
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.remove = __devexit_p(jz_battery_remove),
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.name = "jz4740-battery",
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.owner = THIS_MODULE,
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.pm = JZ_BATTERY_PM_OPS,
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static int __init jz_battery_init(void)
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return platform_driver_register(&jz_battery_driver);
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module_init(jz_battery_init);
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static void __exit jz_battery_exit(void)
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platform_driver_unregister(&jz_battery_driver);
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module_exit(jz_battery_exit);
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MODULE_ALIAS("platform:jz4740-battery");
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
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MODULE_DESCRIPTION("JZ4740 SoC battery driver");