--- /dev/null
+From 97d812a16359f6c9afd2f866176828a7e6e071dc Mon Sep 17 00:00:00 2001
+From: Lars-Peter Clausen <lars@metafoo.de>
+Date: Sat, 24 Apr 2010 12:29:31 +0200
+Subject: [PATCH] Add gpio chager driver
+
+---
+ drivers/power/Kconfig | 7 ++
+ drivers/power/Makefile | 1 +
+ drivers/power/gpio-charger.c | 185 ++++++++++++++++++++++++++++++++++++
+ include/linux/power/gpio-charger.h | 28 ++++++
+ 4 files changed, 221 insertions(+), 0 deletions(-)
+ create mode 100644 drivers/power/gpio-charger.c
+ create mode 100644 include/linux/power/gpio-charger.h
+
+diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
+index 1e5506b..f700b03 100644
+--- a/drivers/power/Kconfig
++++ b/drivers/power/Kconfig
+@@ -153,4 +153,11 @@ config BATTERY_JZ4740
+ This driver can be build as a module. If so, the module will be
+ called jz4740-battery.
+
++config CHARGER_GPIO
++ tristate "GPIO charger"
++ depends on GPIOLIB
++ help
++ Say Y to include support for chargers indicating their status through
++ a GPIO pin.
++
+ endif # POWER_SUPPLY
+diff --git a/drivers/power/Makefile b/drivers/power/Makefile
+index cf95009..51be41a 100644
+--- a/drivers/power/Makefile
++++ b/drivers/power/Makefile
+@@ -35,3 +35,4 @@ 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
++obj-$(CONFIG_CHARGER_GPIO) += gpio-charger.o
+diff --git a/drivers/power/gpio-charger.c b/drivers/power/gpio-charger.c
+new file mode 100644
+index 0000000..b877f74
+--- /dev/null
++++ b/drivers/power/gpio-charger.c
+@@ -0,0 +1,185 @@
++/*
++ * Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
++ * Driver for chargers indicating their status through a GPIO pin
++ *
++ * 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.
++ *
++ */
++
++#include <linux/device.h>
++#include <linux/gpio.h>
++#include <linux/init.h>
++#include <linux/interrupt.h>
++#include <linux/kernel.h>
++#include <linux/module.h>
++#include <linux/platform_device.h>
++#include <linux/power_supply.h>
++#include <linux/slab.h>
++#include <linux/types.h>
++
++#include <linux/power/gpio-charger.h>
++
++struct gpio_charger {
++ const struct gpio_charger_platform_data *pdata;
++
++ int irq;
++
++ struct power_supply charger;
++};
++
++static irqreturn_t gpio_charger_irq(int irq, void *devid)
++{
++ struct power_supply *charger = devid;
++ power_supply_changed(charger);
++
++ return IRQ_HANDLED;
++}
++
++static inline struct gpio_charger *psy_to_gpio_charger(struct power_supply *psy)
++{
++ return container_of(psy, struct gpio_charger, charger);
++}
++
++static int gpio_charger_get_property(struct power_supply *psy,
++ enum power_supply_property psp, union power_supply_propval *val)
++{
++ struct gpio_charger *gpio_charger = psy_to_gpio_charger(psy);
++ const struct gpio_charger_platform_data *pdata = gpio_charger->pdata;
++
++ switch (psp) {
++ case POWER_SUPPLY_PROP_ONLINE:
++ val->intval = gpio_get_value(pdata->gpio);
++ val->intval ^= pdata->gpio_active_low;
++ break;
++ default:
++ return -EINVAL;
++ }
++
++ return 0;
++}
++
++static enum power_supply_property gpio_charger_properties[] = {
++ POWER_SUPPLY_PROP_ONLINE,
++};
++
++static int __devinit gpio_charger_probe(struct platform_device *pdev)
++{
++ const struct gpio_charger_platform_data *pdata = pdev->dev.platform_data;
++ struct gpio_charger *gpio_charger;
++ struct power_supply *charger;
++ int ret;
++
++ if (!pdata) {
++ dev_err(&pdev->dev, "No platform data");
++ return -EINVAL;
++ }
++
++ gpio_charger = kzalloc(sizeof(*gpio_charger), GFP_KERNEL);
++
++ charger = &gpio_charger->charger;
++
++ charger->name = pdata->name;
++ charger->type = pdata->type;
++ charger->properties = gpio_charger_properties;
++ charger->num_properties = ARRAY_SIZE(gpio_charger_properties);
++ charger->get_property = gpio_charger_get_property;
++ charger->supplied_to = pdata->batteries;
++ charger->num_supplicants = pdata->num_batteries;
++
++ if (gpio_is_valid(pdata->gpio)) {
++ ret = gpio_request(pdata->gpio, dev_name(&pdev->dev));
++ if (ret) {
++ dev_err(&pdev->dev, "Failed to request gpio pin: %d\n", ret);
++ goto err;
++ }
++ ret = gpio_direction_input(pdata->gpio);
++ if (ret) {
++ dev_err(&pdev->dev, "Failed to set gpio to input: %d\n", ret);
++ goto err_gpio_free;
++ }
++
++ gpio_charger->irq = gpio_to_irq(pdata->gpio);
++ if (gpio_charger->irq >= 0) {
++ ret = request_irq(gpio_charger->irq, gpio_charger_irq,
++ IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
++ dev_name(&pdev->dev), charger);
++ if (ret) {
++ dev_warn(&pdev->dev, "Failed to request online gpio irq: %d\n", ret);
++ gpio_charger->irq = -1;
++ }
++ }
++ }
++
++ gpio_charger->pdata = pdata;
++
++ ret = power_supply_register(&pdev->dev, charger);
++ if (ret < 0) {
++ dev_err(&pdev->dev, "Failed to register power supply: %d\n", ret);
++ goto err_gpio_free;
++ }
++
++ platform_set_drvdata(pdev, gpio_charger);
++
++ return 0;
++
++err_gpio_free:
++ if (gpio_is_valid(pdata->gpio)) {
++ if (gpio_charger->irq >= 0)
++ free_irq(gpio_charger->irq, charger);
++ gpio_free(pdata->gpio);
++ }
++err:
++ return ret;
++}
++
++static int __devexit gpio_charger_remove(struct platform_device *pdev)
++{
++ struct gpio_charger *gpio_charger = platform_get_drvdata(pdev);
++ const struct gpio_charger_platform_data *pdata = gpio_charger->pdata;
++
++ power_supply_unregister(&gpio_charger->charger);
++
++ if (gpio_is_valid(pdata->gpio)) {
++ if (gpio_charger->irq >= 0)
++ free_irq(gpio_charger->irq, &gpio_charger->charger);
++ gpio_free(pdata->gpio);
++ }
++
++ platform_set_drvdata(pdev, NULL);
++ kfree(gpio_charger);
++
++ return 0;
++}
++
++static struct platform_driver gpio_charger_driver = {
++ .probe = gpio_charger_probe,
++ .remove = __devexit_p(gpio_charger_remove),
++ .driver = {
++ .name = "gpio-charger",
++ .owner = THIS_MODULE,
++ },
++};
++
++static int __init gpio_charger_init(void)
++{
++ return platform_driver_register(&gpio_charger_driver);
++}
++module_init(gpio_charger_init);
++
++static void __exit gpio_charger_exit(void)
++{
++ platform_driver_unregister(&gpio_charger_driver);
++}
++module_exit(gpio_charger_exit);
++
++MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
++MODULE_DESCRIPTION("Driver for chargers indicating their status through a gpio");
++MODULE_LICENSE("GPL");
++MODULE_ALIAS("platform:gpio-charger");
+diff --git a/include/linux/power/gpio-charger.h b/include/linux/power/gpio-charger.h
+new file mode 100644
+index 0000000..95cdfc3
+--- /dev/null
++++ b/include/linux/power/gpio-charger.h
+@@ -0,0 +1,28 @@
++/*
++ * Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
++ *
++ * 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 __LINUX_POWER_GPIO_CHARGER_H__
++#define __LINUX_POWER_GPIO_CHARGER_H__
++
++struct gpio_charger_platform_data {
++ const char *name;
++ enum power_supply_type type;
++ int gpio;
++ int gpio_active_low;
++
++ char **batteries;
++ size_t num_batteries;
++};
++
++#endif
+--
+1.5.6.5
+
projects / openwrt.git / blobdiff