+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * 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>
- */
-
-#include <linux/interrupt.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/platform_device.h>
-#include <linux/slab.h>
-#include <linux/io.h>
-
-#include <linux/delay.h>
-#include <linux/err.h>
-#include <linux/gpio.h>
-#include <linux/mfd/core.h>
-#include <linux/power_supply.h>
-
-#include <linux/power/jz4740-battery.h>
-#include <linux/jz4740-adc.h>
-
-struct jz_battery {
- struct jz_battery_platform_data *pdata;
- struct platform_device *pdev;
-
- void __iomem *base;
-
- int irq;
- int charge_irq;
-
- const struct mfd_cell *cell;
-
- int status;
- long voltage;
-
- struct completion read_completion;
-
- struct power_supply *battery;
- struct power_supply_desc battery_desc;
- struct delayed_work work;
-
- struct mutex lock;
-};
-
-static inline struct jz_battery *psy_to_jz_battery(struct power_supply *psy)
-{
- return power_supply_get_drvdata(psy);
-}
-
-static irqreturn_t jz_battery_irq_handler(int irq, void *devid)
-{
- struct jz_battery *battery = devid;
-
- complete(&battery->read_completion);
- return IRQ_HANDLED;
-}
-
-static long jz_battery_read_voltage(struct jz_battery *battery)
-{
- long t;
- unsigned long val;
- long voltage;
-
- mutex_lock(&battery->lock);
-
- reinit_completion(&battery->read_completion);
-
- enable_irq(battery->irq);
- battery->cell->enable(battery->pdev);
-
- t = wait_for_completion_interruptible_timeout(&battery->read_completion,
- HZ);
-
- if (t > 0) {
- val = readw(battery->base) & 0xfff;
-
- if (battery->pdata->info.voltage_max_design <= 2500000)
- val = (val * 78125UL) >> 7UL;
- else
- val = ((val * 924375UL) >> 9UL) + 33000;
- voltage = (long)val;
- } else {
- voltage = t ? t : -ETIMEDOUT;
- }
-
- battery->cell->disable(battery->pdev);
- disable_irq(battery->irq);
-
- mutex_unlock(&battery->lock);
-
- return voltage;
-}
-
-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);
-
- mod_delayed_work(system_wq, &jz_battery->work, 0);
-}
-
-static irqreturn_t jz_battery_charge_irq(int irq, void *data)
-{
- struct jz_battery *jz_battery = data;
-
- mod_delayed_work(system_wq, &jz_battery->work, 0);
-
- return IRQ_HANDLED;
-}
-
-static void jz_battery_update(struct jz_battery *jz_battery)
-{
- int status;
- long voltage;
- bool has_changed = false;
- int is_charging;
-
- if (gpio_is_valid(jz_battery->pdata->gpio_charge)) {
- 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 = true;
- }
- }
-
- voltage = jz_battery_read_voltage(jz_battery);
- if (voltage >= 0 && abs(voltage - jz_battery->voltage) > 50000) {
- jz_battery->voltage = voltage;
- has_changed = true;
- }
-
- 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.parent->platform_data;
- struct power_supply_config psy_cfg = {};
- struct jz_battery *jz_battery;
- struct power_supply_desc *battery_desc;
- struct resource *mem;
-
- if (!pdata) {
- dev_err(&pdev->dev, "No platform_data supplied\n");
- return -ENXIO;
- }
-
- jz_battery = devm_kzalloc(&pdev->dev, sizeof(*jz_battery), GFP_KERNEL);
- if (!jz_battery) {
- dev_err(&pdev->dev, "Failed to allocate driver structure\n");
- return -ENOMEM;
- }
-
- jz_battery->cell = mfd_get_cell(pdev);
-
- jz_battery->irq = platform_get_irq(pdev, 0);
- if (jz_battery->irq < 0) {
- dev_err(&pdev->dev, "Failed to get platform irq: %d\n", ret);
- return jz_battery->irq;
- }
-
- mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-
- jz_battery->base = devm_ioremap_resource(&pdev->dev, mem);
- if (IS_ERR(jz_battery->base))
- return PTR_ERR(jz_battery->base);
-
- battery_desc = &jz_battery->battery_desc;
- battery_desc->name = pdata->info.name;
- battery_desc->type = POWER_SUPPLY_TYPE_BATTERY;
- battery_desc->properties = jz_battery_properties;
- battery_desc->num_properties = ARRAY_SIZE(jz_battery_properties);
- battery_desc->get_property = jz_battery_get_property;
- battery_desc->external_power_changed =
- jz_battery_external_power_changed;
- battery_desc->use_for_apm = 1;
-
- psy_cfg.drv_data = jz_battery;
-
- jz_battery->pdata = pdata;
- jz_battery->pdev = pdev;
-
- init_completion(&jz_battery->read_completion);
- mutex_init(&jz_battery->lock);
-
- INIT_DELAYED_WORK(&jz_battery->work, jz_battery_work);
-
- ret = request_irq(jz_battery->irq, jz_battery_irq_handler, 0, pdev->name,
- jz_battery);
- if (ret) {
- dev_err(&pdev->dev, "Failed to request irq %d\n", ret);
- return ret;
- }
- disable_irq(jz_battery->irq);
-
- 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_irq;
- }
- 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;
- }
-
- if (jz_battery->pdata->info.voltage_max_design <= 2500000)
- jz4740_adc_set_config(pdev->dev.parent, JZ_ADC_CONFIG_BAT_MB,
- JZ_ADC_CONFIG_BAT_MB);
- else
- jz4740_adc_set_config(pdev->dev.parent, JZ_ADC_CONFIG_BAT_MB, 0);
-
- jz_battery->battery = power_supply_register(&pdev->dev, battery_desc,
- &psy_cfg);
- if (IS_ERR(jz_battery->battery)) {
- dev_err(&pdev->dev, "power supply battery register failed.\n");
- ret = PTR_ERR(jz_battery->battery);
- goto err_free_charge_irq;
- }
-
- platform_set_drvdata(pdev, jz_battery);
- schedule_delayed_work(&jz_battery->work, 0);
-
- return 0;
-
-err_free_charge_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_irq:
- free_irq(jz_battery->irq, 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);
-
- free_irq(jz_battery->irq, jz_battery);
-
- return 0;
-}
-
-#ifdef CONFIG_PM
-static int jz_battery_suspend(struct device *dev)
-{
- struct jz_battery *jz_battery = dev_get_drvdata(dev);
-
- cancel_delayed_work_sync(&jz_battery->work);
- jz_battery->status = POWER_SUPPLY_STATUS_UNKNOWN;
-
- return 0;
-}
-
-static int jz_battery_resume(struct device *dev)
-{
- struct jz_battery *jz_battery = dev_get_drvdata(dev);
-
- schedule_delayed_work(&jz_battery->work, 0);
-
- return 0;
-}
-
-static const struct dev_pm_ops jz_battery_pm_ops = {
- .suspend = jz_battery_suspend,
- .resume = jz_battery_resume,
-};
-
-#define JZ_BATTERY_PM_OPS (&jz_battery_pm_ops)
-#else
-#define JZ_BATTERY_PM_OPS NULL
-#endif
-
-static struct platform_driver jz_battery_driver = {
- .probe = jz_battery_probe,
- .remove = jz_battery_remove,
- .driver = {
- .name = "jz4740-battery",
- .pm = JZ_BATTERY_PM_OPS,
- },
-};
-
-module_platform_driver(jz_battery_driver);
-
-MODULE_ALIAS("platform:jz4740-battery");
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
-MODULE_DESCRIPTION("JZ4740 SoC battery driver");
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