mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-11-25 12:47:31 +02:00
12cb8e47f8
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@24914 3c298f89-4303-0410-b956-a3cf2f4a3e73
255 lines
7.1 KiB
Diff
255 lines
7.1 KiB
Diff
From 27681cf969174af00e63d572f257e2155bb914be 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 04/23] 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
|
|
|
|
--- a/drivers/power/Kconfig
|
|
+++ b/drivers/power/Kconfig
|
|
@@ -185,4 +185,11 @@ config CHARGER_TWL4030
|
|
help
|
|
Say Y here to enable support for TWL4030 Battery Charge Interface.
|
|
|
|
+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
|
|
--- a/drivers/power/Makefile
|
|
+++ b/drivers/power/Makefile
|
|
@@ -32,3 +32,4 @@ obj-$(CONFIG_BATTERY_JZ4740) += jz4740-b
|
|
obj-$(CONFIG_BATTERY_INTEL_MID) += intel_mid_battery.o
|
|
obj-$(CONFIG_CHARGER_ISP1704) += isp1704_charger.o
|
|
obj-$(CONFIG_CHARGER_TWL4030) += twl4030_charger.o
|
|
+obj-$(CONFIG_CHARGER_GPIO) += gpio-charger.o
|
|
--- /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");
|
|
--- /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
|