+++ /dev/null
-/*
- * Battery measurement code for Ingenic JZ SOC.
- *
- * Copyright (C) 2009 Jiejing Zhang <kzjeef@gmail.com>
- * Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
- *
- * based on tosa_battery.c
- *
- * Copyright (C) 2008 Marek Vasut <marek.vasut@gmail.com>
-*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- */
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/power_supply.h>
-#include <linux/delay.h>
-#include <linux/spinlock.h>
-#include <linux/interrupt.h>
-#include <linux/platform_device.h>
-#include <linux/gpio.h>
-#include <linux/interrupt.h>
-
-#include <linux/power/jz4740-battery.h>
-#include <linux/jz4740-adc.h>
-
-struct jz_battery {
- struct jz_battery_platform_data *pdata;
-
- int charge_irq;
-
- int status;
- long voltage;
-
- struct power_supply battery;
- struct delayed_work work;
-};
-
-static inline struct jz_battery *psy_to_jz_battery(struct power_supply *psy)
-{
- return container_of(psy, struct jz_battery, battery);
-}
-
-static long jz_battery_read_voltage(struct jz_battery *jz_battery)
-{
- struct device *adc = jz_battery->battery.dev->parent->parent;
- enum jz_adc_battery_scale scale;
-
- if (jz_battery->pdata->info.voltage_max_design > 2500000)
- scale = JZ_ADC_BATTERY_SCALE_7V5;
- else
- scale = JZ_ADC_BATTERY_SCALE_2V5;
-
- return jz4740_adc_read_battery_voltage(adc, scale);
-}
-
-static int jz_battery_get_capacity(struct power_supply *psy)
-{
- struct jz_battery *jz_battery = psy_to_jz_battery(psy);
- struct power_supply_info *info = &jz_battery->pdata->info;
- long voltage;
- int ret;
- int voltage_span;
-
- voltage = jz_battery_read_voltage(jz_battery);
-
- if (voltage < 0)
- return voltage;
-
- voltage_span = info->voltage_max_design - info->voltage_min_design;
- ret = ((voltage - info->voltage_min_design) * 100) / voltage_span;
-
- if (ret > 100)
- ret = 100;
- else if (ret < 0)
- ret = 0;
-
- return ret;
-}
-
-static int jz_battery_get_property(struct power_supply *psy,
- enum power_supply_property psp,
- union power_supply_propval *val)
-{
- struct jz_battery *jz_battery = psy_to_jz_battery(psy);
- struct power_supply_info *info = &jz_battery->pdata->info;
- long voltage;
-
- switch (psp) {
- case POWER_SUPPLY_PROP_STATUS:
- val->intval = jz_battery->status;
- break;
- case POWER_SUPPLY_PROP_TECHNOLOGY:
- val->intval = jz_battery->pdata->info.technology;
- break;
- case POWER_SUPPLY_PROP_HEALTH:
- voltage = jz_battery_read_voltage(jz_battery);
- if (voltage < info->voltage_min_design)
- val->intval = POWER_SUPPLY_HEALTH_DEAD;
- else
- val->intval = POWER_SUPPLY_HEALTH_GOOD;
- break;
- case POWER_SUPPLY_PROP_CAPACITY:
- val->intval = jz_battery_get_capacity(psy);
- break;
- case POWER_SUPPLY_PROP_VOLTAGE_NOW:
- val->intval = jz_battery_read_voltage(jz_battery);
- if (val->intval < 0)
- return val->intval;
- break;
- case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
- val->intval = info->voltage_max_design;
- break;
- case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
- val->intval = info->voltage_min_design;
- break;
- case POWER_SUPPLY_PROP_PRESENT:
- val->intval = 1;
- break;
- default:
- return -EINVAL;
- }
- return 0;
-}
-
-static void jz_battery_external_power_changed(struct power_supply *psy)
-{
- struct jz_battery *jz_battery = psy_to_jz_battery(psy);
-
- cancel_delayed_work(&jz_battery->work);
- schedule_delayed_work(&jz_battery->work, 0);
-}
-
-static irqreturn_t jz_battery_charge_irq(int irq, void *data)
-{
- struct jz_battery *jz_battery = data;
-
- cancel_delayed_work(&jz_battery->work);
- schedule_delayed_work(&jz_battery->work, 0);
-
- return IRQ_HANDLED;
-}
-
-static void jz_battery_update(struct jz_battery *jz_battery)
-{
- int status;
- long voltage;
- long voltage_difference;
- bool has_changed = 0;
-
- if (gpio_is_valid(jz_battery->pdata->gpio_charge)) {
- int is_charging;
-
- is_charging = gpio_get_value(jz_battery->pdata->gpio_charge);
- is_charging ^= jz_battery->pdata->gpio_charge_active_low;
- if (is_charging)
- status = POWER_SUPPLY_STATUS_CHARGING;
- else
- status = POWER_SUPPLY_STATUS_NOT_CHARGING;
-
- if (status != jz_battery->status) {
- jz_battery->status = status;
- has_changed = 1;
- }
- }
-
- voltage = jz_battery_read_voltage(jz_battery);
- voltage_difference = voltage - jz_battery->voltage;
- if (voltage_difference > 50000 || voltage_difference < 50000) {
- jz_battery->voltage = voltage;
- has_changed = 1;
- }
- if (has_changed)
- power_supply_changed(&jz_battery->battery);
-}
-
-static enum power_supply_property jz_battery_properties[] = {
- POWER_SUPPLY_PROP_STATUS,
- POWER_SUPPLY_PROP_TECHNOLOGY,
- POWER_SUPPLY_PROP_HEALTH,
- POWER_SUPPLY_PROP_CAPACITY,
- POWER_SUPPLY_PROP_VOLTAGE_NOW,
- POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
- POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
- POWER_SUPPLY_PROP_PRESENT,
-};
-
-static void jz_battery_work(struct work_struct *work)
-{
- /* Too small interval will increase system workload */
- const int interval = HZ * 30;
- struct jz_battery *jz_battery = container_of(work, struct jz_battery,
- work.work);
-
- jz_battery_update(jz_battery);
- schedule_delayed_work(&jz_battery->work, interval);
-}
-
-static int jz_battery_probe(struct platform_device *pdev)
-{
- int ret = 0;
- struct jz_battery_platform_data *pdata = pdev->dev.platform_data;
- struct jz_battery *jz_battery;
- struct power_supply *battery;
-
- if (!pdev->dev.platform_data) {
- dev_err(&pdev->dev, "No platform data\n");
- return -EINVAL;
- }
-
- jz_battery = kzalloc(sizeof(*jz_battery), GFP_KERNEL);
-
- if (!jz_battery) {
- dev_err(&pdev->dev, "Failed to allocate driver structure\n");
- return -ENOMEM;
- }
-
- battery = &jz_battery->battery;
- battery->name = pdata->info.name;
- battery->type = POWER_SUPPLY_TYPE_BATTERY;
- battery->properties = jz_battery_properties;
- battery->num_properties = ARRAY_SIZE(jz_battery_properties);
- battery->get_property = jz_battery_get_property;
- battery->external_power_changed = jz_battery_external_power_changed;
- battery->use_for_apm = 1;
-
- jz_battery->pdata = pdata;
-
- INIT_DELAYED_WORK(&jz_battery->work, jz_battery_work);
-
- if (gpio_is_valid(pdata->gpio_charge)) {
- ret = gpio_request(pdata->gpio_charge, dev_name(&pdev->dev));
- if (ret) {
- dev_err(&pdev->dev, "charger state gpio request failed.\n");
- goto err_free;
- }
- ret = gpio_direction_input(pdata->gpio_charge);
- if (ret) {
- dev_err(&pdev->dev, "charger state gpio set direction failed.\n");
- goto err_free_gpio;
- }
-
- jz_battery->charge_irq = gpio_to_irq(pdata->gpio_charge);
-
- if (jz_battery->charge_irq >= 0) {
- ret = request_irq(jz_battery->charge_irq,
- jz_battery_charge_irq,
- IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
- dev_name(&pdev->dev), jz_battery);
- if (ret) {
- dev_err(&pdev->dev, "Failed to request charge irq: %d\n", ret);
- goto err_free_gpio;
- }
- }
- } else {
- jz_battery->charge_irq = -1;
- }
-
-
- ret = power_supply_register(&pdev->dev, &jz_battery->battery);
- if (ret) {
- dev_err(&pdev->dev, "power supply battery register failed.\n");
- goto err_free_irq;
- }
-
- platform_set_drvdata(pdev, jz_battery);
- schedule_delayed_work(&jz_battery->work, 0);
-
- return 0;
-
-err_free_irq:
- if (jz_battery->charge_irq >= 0)
- free_irq(jz_battery->charge_irq, jz_battery);
-err_free_gpio:
- if (gpio_is_valid(pdata->gpio_charge))
- gpio_free(jz_battery->pdata->gpio_charge);
-err_free:
- kfree(jz_battery);
- return ret;
-}
-
-static int jz_battery_remove(struct platform_device *pdev)
-{
- struct jz_battery *jz_battery = platform_get_drvdata(pdev);
-
- cancel_delayed_work_sync(&jz_battery->work);
-
- if (gpio_is_valid(jz_battery->pdata->gpio_charge)) {
- if (jz_battery->charge_irq >= 0)
- free_irq(jz_battery->charge_irq, jz_battery);
- gpio_free(jz_battery->pdata->gpio_charge);
- }
-
- power_supply_unregister(&jz_battery->battery);
-
- return 0;
-}
-
-#ifdef CONFIG_PM
-static int jz_battery_suspend(struct platform_device *pdev, pm_message_t state)
-{
- struct jz_battery *jz_battery = platform_get_drvdata(pdev);
-
- cancel_delayed_work_sync(&jz_battery->work);
- jz_battery->status = POWER_SUPPLY_STATUS_UNKNOWN;
-
- return 0;
-}
-
-static int jz_battery_resume(struct platform_device *pdev)
-{
- struct jz_battery *jz_battery = platform_get_drvdata(pdev);
-
- schedule_delayed_work(&jz_battery->work, 0);
-
- return 0;
-}
-#else
-#define jz_battery_suspend NULL
-#define jz_battery_resume NULL
-#endif
-
-static struct platform_driver jz_battery_driver = {
- .probe = jz_battery_probe,
- .remove = __devexit_p(jz_battery_remove),
- .suspend = jz_battery_suspend,
- .resume = jz_battery_resume,
- .driver = {
- .name = "jz4740-battery",
- .owner = THIS_MODULE,
- },
-};
-
-static int __init jz_battery_init(void)
-{
- return platform_driver_register(&jz_battery_driver);
-}
-module_init(jz_battery_init);
-
-static void __exit jz_battery_exit(void)
-{
- platform_driver_unregister(&jz_battery_driver);
-}
-module_exit(jz_battery_exit);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Jiejing Zhang <kzjeef@gmail.com>");
-MODULE_DESCRIPTION("JZ4720/JZ4740 SoC battery driver");
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