mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-11-18 23:54:26 +08:00
POWER: Add JZ4740 battery driver.
Add support for the battery voltage measurement part of the JZ4740 ADC unit. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Acked-by: Anton 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: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Lars-Peter Clausen
Ralf Baechle
parent
7f983ba93d
commit
f6a21388bd
@ -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
|
||||
|
||||
445
drivers/power/jz4740-battery.c
Normal file
445
drivers/power/jz4740-battery.c
Normal file
@ -0,0 +1,445 @@
|
||||
/*
|
||||
* 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");
|
||||
24
include/linux/power/jz4740-battery.h
Normal file
24
include/linux/power/jz4740-battery.h
Normal file
@ -0,0 +1,24 @@
|
||||
/*
|
||||
* 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
|
||||
Loading…
Reference in New Issue
Block a user