Commit f6a21388 authored by Lars-Peter Clausen's avatar Lars-Peter Clausen Committed by Ralf Baechle
Browse files

POWER: Add JZ4740 battery driver.



Add support for the battery voltage measurement part of the JZ4740 ADC unit.
Signed-off-by: default avatarLars-Peter Clausen <lars@metafoo.de>
Acked-by: default avatarAnton Vorontsov <cbouatmailru@gmail.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/1416/

Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 7f983ba9
......@@ -142,4 +142,15 @@ config CHARGER_PCF50633
help
Say Y to include support for NXP PCF50633 Main Battery Charger.
config BATTERY_JZ4740
tristate "Ingenic JZ4740 battery"
depends on MACH_JZ4740
depends on MFD_JZ4740_ADC
help
Say Y to enable support for the battery on Ingenic JZ4740 based
boards.
This driver can be build as a module. If so, the module will be
called jz4740-battery.
endif # POWER_SUPPLY
......@@ -34,3 +34,4 @@ obj-$(CONFIG_BATTERY_DA9030) += da9030_battery.o
obj-$(CONFIG_BATTERY_MAX17040) += max17040_battery.o
obj-$(CONFIG_BATTERY_Z2) += z2_battery.o
obj-$(CONFIG_CHARGER_PCF50633) += pcf50633-charger.o
obj-$(CONFIG_BATTERY_JZ4740) += jz4740-battery.o
/*
* 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/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/delay.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;
struct resource *mem;
void __iomem *base;
int irq;
int charge_irq;
struct mfd_cell *cell;
int status;
long voltage;
struct completion read_completion;
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 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)
{
unsigned long t;
unsigned long val;
long voltage;
INIT_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);
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);
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;
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 (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 __devinit jz_battery_probe(struct platform_device *pdev)
{
int ret = 0;
struct jz_battery_platform_data *pdata = pdev->dev.parent->platform_data;
struct jz_battery *jz_battery;
struct power_supply *battery;
jz_battery = kzalloc(sizeof(*jz_battery), GFP_KERNEL);
if (!jz_battery) {
dev_err(&pdev->dev, "Failed to allocate driver structure\n");
return -ENOMEM;
}
jz_battery->cell = pdev->dev.platform_data;
jz_battery->irq = platform_get_irq(pdev, 0);
if (jz_battery->irq < 0) {
ret = jz_battery->irq;
dev_err(&pdev->dev, "Failed to get platform irq: %d\n", ret);
goto err_free;
}
jz_battery->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!jz_battery->mem) {
ret = -ENOENT;
dev_err(&pdev->dev, "Failed to get platform mmio resource\n");
goto err_free;
}
jz_battery->mem = request_mem_region(jz_battery->mem->start,
resource_size(jz_battery->mem), pdev->name);
if (!jz_battery->mem) {
ret = -EBUSY;
dev_err(&pdev->dev, "Failed to request mmio memory region\n");
goto err_free;
}
jz_battery->base = ioremap_nocache(jz_battery->mem->start,
resource_size(jz_battery->mem));
if (!jz_battery->base) {
ret = -EBUSY;
dev_err(&pdev->dev, "Failed to ioremap mmio memory\n");
goto err_release_mem_region;
}
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;
jz_battery->pdev = pdev;
init_completion(&jz_battery->read_completion);
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);
goto err_iounmap;
}
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);
ret = power_supply_register(&pdev->dev, &jz_battery->battery);
if (ret) {
dev_err(&pdev->dev, "power supply battery register failed.\n");
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);
err_iounmap:
platform_set_drvdata(pdev, NULL);
iounmap(jz_battery->base);
err_release_mem_region:
release_mem_region(jz_battery->mem->start, resource_size(jz_battery->mem));
err_free:
kfree(jz_battery);
return ret;
}
static int __devexit 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);
iounmap(jz_battery->base);
release_mem_region(jz_battery->mem->start, resource_size(jz_battery->mem));
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 = __devexit_p(jz_battery_remove),
.driver = {
.name = "jz4740-battery",
.owner = THIS_MODULE,
.pm = JZ_BATTERY_PM_OPS,
},
};
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_ALIAS("platform:jz4740-battery");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
MODULE_DESCRIPTION("JZ4740 SoC battery driver");
/*
* Copyright (C) 2009, Jiejing Zhang <kzjeef@gmail.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#ifndef __JZ4740_BATTERY_H
#define __JZ4740_BATTERY_H
struct jz_battery_platform_data {
struct power_supply_info info;
int gpio_charge; /* GPIO port of Charger state */
int gpio_charge_active_low;
};
#endif
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