255 lines
7.1 KiB
Diff
255 lines
7.1 KiB
Diff
From fdb92490f76e1fd9292c9e967ab8d636cdbb087c Mon Sep 17 00:00:00 2001
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From: Lars-Peter Clausen <lars@metafoo.de>
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Date: Sat, 24 Apr 2010 12:29:31 +0200
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Subject: [PATCH] Add gpio chager driver
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---
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drivers/power/Kconfig | 7 ++
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drivers/power/Makefile | 1 +
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drivers/power/gpio-charger.c | 185 ++++++++++++++++++++++++++++++++++++
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include/linux/power/gpio-charger.h | 28 ++++++
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4 files changed, 221 insertions(+), 0 deletions(-)
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create mode 100644 drivers/power/gpio-charger.c
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create mode 100644 include/linux/power/gpio-charger.h
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--- a/drivers/power/Kconfig
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+++ b/drivers/power/Kconfig
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@@ -166,4 +166,11 @@ config BATTERY_INTEL_MID
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Say Y here to enable the battery driver on Intel MID
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platforms.
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+config CHARGER_GPIO
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+ tristate "GPIO charger"
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+ depends on GPIOLIB
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+ help
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+ Say Y to include support for chargers indicating their status through
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+ a GPIO pin.
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+
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endif # POWER_SUPPLY
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--- a/drivers/power/Makefile
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+++ b/drivers/power/Makefile
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@@ -37,3 +37,4 @@ obj-$(CONFIG_BATTERY_S3C_ADC) += s3c_adc
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obj-$(CONFIG_CHARGER_PCF50633) += pcf50633-charger.o
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obj-$(CONFIG_BATTERY_JZ4740) += jz4740-battery.o
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obj-$(CONFIG_BATTERY_INTEL_MID) += intel_mid_battery.o
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+obj-$(CONFIG_CHARGER_GPIO) += gpio-charger.o
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--- /dev/null
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+++ b/drivers/power/gpio-charger.c
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@@ -0,0 +1,185 @@
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+/*
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+ * Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
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+ * Driver for chargers indicating their status through a GPIO pin
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+ *
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+ * This program is free software; you can redistribute it and/or modify it
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+ * under the terms of the GNU General Public License as published by the
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+ * Free Software Foundation; either version 2 of the License, or (at your
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+ * option) any later version.
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+ *
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+ * You should have received a copy of the GNU General Public License along
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+ * with this program; if not, write to the Free Software Foundation, Inc.,
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+ * 675 Mass Ave, Cambridge, MA 02139, USA.
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+ *
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+ */
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+
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+#include <linux/device.h>
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+#include <linux/gpio.h>
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+#include <linux/init.h>
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+#include <linux/interrupt.h>
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+#include <linux/kernel.h>
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+#include <linux/module.h>
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+#include <linux/platform_device.h>
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+#include <linux/power_supply.h>
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+#include <linux/slab.h>
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+#include <linux/types.h>
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+
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+#include <linux/power/gpio-charger.h>
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+
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+struct gpio_charger {
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+ const struct gpio_charger_platform_data *pdata;
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+
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+ int irq;
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+
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+ struct power_supply charger;
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+};
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+
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+static irqreturn_t gpio_charger_irq(int irq, void *devid)
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+{
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+ struct power_supply *charger = devid;
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+ power_supply_changed(charger);
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+
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+ return IRQ_HANDLED;
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+}
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+
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+static inline struct gpio_charger *psy_to_gpio_charger(struct power_supply *psy)
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+{
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+ return container_of(psy, struct gpio_charger, charger);
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+}
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+
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+static int gpio_charger_get_property(struct power_supply *psy,
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+ enum power_supply_property psp, union power_supply_propval *val)
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+{
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+ struct gpio_charger *gpio_charger = psy_to_gpio_charger(psy);
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+ const struct gpio_charger_platform_data *pdata = gpio_charger->pdata;
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+
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+ switch (psp) {
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+ case POWER_SUPPLY_PROP_ONLINE:
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+ val->intval = gpio_get_value(pdata->gpio);
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+ val->intval ^= pdata->gpio_active_low;
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+ break;
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+ default:
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+ return -EINVAL;
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+ }
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+
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+ return 0;
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+}
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+
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+static enum power_supply_property gpio_charger_properties[] = {
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+ POWER_SUPPLY_PROP_ONLINE,
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+};
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+
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+static int __devinit gpio_charger_probe(struct platform_device *pdev)
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+{
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+ const struct gpio_charger_platform_data *pdata = pdev->dev.platform_data;
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+ struct gpio_charger *gpio_charger;
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+ struct power_supply *charger;
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+ int ret;
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+
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+ if (!pdata) {
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+ dev_err(&pdev->dev, "No platform data");
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+ return -EINVAL;
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+ }
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+
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+ gpio_charger = kzalloc(sizeof(*gpio_charger), GFP_KERNEL);
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+
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+ charger = &gpio_charger->charger;
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+
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+ charger->name = pdata->name;
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+ charger->type = pdata->type;
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+ charger->properties = gpio_charger_properties;
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+ charger->num_properties = ARRAY_SIZE(gpio_charger_properties);
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+ charger->get_property = gpio_charger_get_property;
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+ charger->supplied_to = pdata->batteries;
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+ charger->num_supplicants = pdata->num_batteries;
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+
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+ if (gpio_is_valid(pdata->gpio)) {
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+ ret = gpio_request(pdata->gpio, dev_name(&pdev->dev));
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+ if (ret) {
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+ dev_err(&pdev->dev, "Failed to request gpio pin: %d\n", ret);
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+ goto err;
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+ }
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+ ret = gpio_direction_input(pdata->gpio);
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+ if (ret) {
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+ dev_err(&pdev->dev, "Failed to set gpio to input: %d\n", ret);
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+ goto err_gpio_free;
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+ }
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+
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+ gpio_charger->irq = gpio_to_irq(pdata->gpio);
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+ if (gpio_charger->irq >= 0) {
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+ ret = request_irq(gpio_charger->irq, gpio_charger_irq,
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+ IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
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+ dev_name(&pdev->dev), charger);
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+ if (ret) {
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+ dev_warn(&pdev->dev, "Failed to request online gpio irq: %d\n", ret);
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+ gpio_charger->irq = -1;
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+ }
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+ }
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+ }
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+
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+ gpio_charger->pdata = pdata;
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+
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+ ret = power_supply_register(&pdev->dev, charger);
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+ if (ret < 0) {
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+ dev_err(&pdev->dev, "Failed to register power supply: %d\n", ret);
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+ goto err_gpio_free;
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+ }
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+
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+ platform_set_drvdata(pdev, gpio_charger);
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+
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+ return 0;
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+
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+err_gpio_free:
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+ if (gpio_is_valid(pdata->gpio)) {
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+ if (gpio_charger->irq >= 0)
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+ free_irq(gpio_charger->irq, charger);
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+ gpio_free(pdata->gpio);
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+ }
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+err:
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+ return ret;
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+}
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+
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+static int __devexit gpio_charger_remove(struct platform_device *pdev)
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+{
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+ struct gpio_charger *gpio_charger = platform_get_drvdata(pdev);
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+ const struct gpio_charger_platform_data *pdata = gpio_charger->pdata;
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+
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+ power_supply_unregister(&gpio_charger->charger);
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+
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+ if (gpio_is_valid(pdata->gpio)) {
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+ if (gpio_charger->irq >= 0)
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+ free_irq(gpio_charger->irq, &gpio_charger->charger);
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+ gpio_free(pdata->gpio);
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+ }
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+
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+ platform_set_drvdata(pdev, NULL);
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+ kfree(gpio_charger);
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+
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+ return 0;
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+}
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+
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+static struct platform_driver gpio_charger_driver = {
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+ .probe = gpio_charger_probe,
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+ .remove = __devexit_p(gpio_charger_remove),
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+ .driver = {
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+ .name = "gpio-charger",
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+ .owner = THIS_MODULE,
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+ },
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+};
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+
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+static int __init gpio_charger_init(void)
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+{
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+ return platform_driver_register(&gpio_charger_driver);
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+}
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+module_init(gpio_charger_init);
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+
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+static void __exit gpio_charger_exit(void)
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+{
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+ platform_driver_unregister(&gpio_charger_driver);
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+}
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+module_exit(gpio_charger_exit);
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+
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+MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
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+MODULE_DESCRIPTION("Driver for chargers indicating their status through a gpio");
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+MODULE_LICENSE("GPL");
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+MODULE_ALIAS("platform:gpio-charger");
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--- /dev/null
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+++ b/include/linux/power/gpio-charger.h
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@@ -0,0 +1,28 @@
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+/*
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+ * Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
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+ *
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+ * This program is free software; you can redistribute it and/or modify it
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+ * under the terms of the GNU General Public License as published by the
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+ * Free Software Foundation; either version 2 of the License, or (at your
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+ * option) any later version.
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+ *
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+ * You should have received a copy of the GNU General Public License along
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+ * with this program; if not, write to the Free Software Foundation, Inc.,
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+ * 675 Mass Ave, Cambridge, MA 02139, USA.
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+ *
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+ */
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+
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+#ifndef __LINUX_POWER_GPIO_CHARGER_H__
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+#define __LINUX_POWER_GPIO_CHARGER_H__
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+
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+struct gpio_charger_platform_data {
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+ const char *name;
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+ enum power_supply_type type;
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+ int gpio;
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+ int gpio_active_low;
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+
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+ char **batteries;
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+ size_t num_batteries;
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+};
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+
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+#endif
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