mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-08-21 23:55:53 +03:00
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@31335 3c298f89-4303-0410-b956-a3cf2f4a3e73
135 lines
4.0 KiB
Diff
135 lines
4.0 KiB
Diff
From 8817c547f92016b9276ffec88b708c2c16d1f0f1 Mon Sep 17 00:00:00 2001
|
|
From: John Crispin <blogic@openwrt.org>
|
|
Date: Thu, 8 Mar 2012 13:23:53 +0100
|
|
Subject: [PATCH 01/73] GPIO: add bindings for managed devices
|
|
|
|
This patch adds 2 functions that allow managed devices to request GPIOs.
|
|
These GPIOs will then be managed by drivers/base/devres.c.
|
|
|
|
Signed-off-by: John Crispin <blogic@openwrt.org>
|
|
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
|
|
---
|
|
drivers/gpio/Makefile | 2 +-
|
|
drivers/gpio/devres.c | 90 ++++++++++++++++++++++++++++++++++++++++++++
|
|
include/asm-generic/gpio.h | 4 ++
|
|
3 files changed, 95 insertions(+), 1 deletions(-)
|
|
create mode 100644 drivers/gpio/devres.c
|
|
|
|
--- a/drivers/gpio/Makefile
|
|
+++ b/drivers/gpio/Makefile
|
|
@@ -2,7 +2,7 @@
|
|
|
|
ccflags-$(CONFIG_DEBUG_GPIO) += -DDEBUG
|
|
|
|
-obj-$(CONFIG_GPIOLIB) += gpiolib.o
|
|
+obj-$(CONFIG_GPIOLIB) += gpiolib.o devres.o
|
|
|
|
# Device drivers. Generally keep list sorted alphabetically
|
|
obj-$(CONFIG_GPIO_GENERIC) += gpio-generic.o
|
|
--- /dev/null
|
|
+++ b/drivers/gpio/devres.c
|
|
@@ -0,0 +1,90 @@
|
|
+/*
|
|
+ * drivers/gpio/devres.c - managed gpio resources
|
|
+ *
|
|
+ * 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.
|
|
+ *
|
|
+ * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
+ *
|
|
+ * This file is based on kernel/irq/devres.c
|
|
+ *
|
|
+ * Copyright (c) 2011 John Crispin <blogic@openwrt.org>
|
|
+ */
|
|
+
|
|
+#include <linux/module.h>
|
|
+#include <linux/gpio.h>
|
|
+#include <linux/device.h>
|
|
+#include <linux/gfp.h>
|
|
+
|
|
+static void devm_gpio_release(struct device *dev, void *res)
|
|
+{
|
|
+ unsigned *gpio = res;
|
|
+
|
|
+ gpio_free(*gpio);
|
|
+}
|
|
+
|
|
+static int devm_gpio_match(struct device *dev, void *res, void *data)
|
|
+{
|
|
+ unsigned *this = res, *gpio = data;
|
|
+
|
|
+ return *this == *gpio;
|
|
+}
|
|
+
|
|
+/**
|
|
+ * devm_gpio_request - request a gpio for a managed device
|
|
+ * @dev: device to request the gpio for
|
|
+ * @gpio: gpio to allocate
|
|
+ * @label: the name of the requested gpio
|
|
+ *
|
|
+ * Except for the extra @dev argument, this function takes the
|
|
+ * same arguments and performs the same function as
|
|
+ * gpio_request(). GPIOs requested with this function will be
|
|
+ * automatically freed on driver detach.
|
|
+ *
|
|
+ * If an GPIO allocated with this function needs to be freed
|
|
+ * separately, devm_gpio_free() must be used.
|
|
+ */
|
|
+
|
|
+int devm_gpio_request(struct device *dev, unsigned gpio, const char *label)
|
|
+{
|
|
+ unsigned *dr;
|
|
+ int rc;
|
|
+
|
|
+ dr = devres_alloc(devm_gpio_release, sizeof(unsigned), GFP_KERNEL);
|
|
+ if (!dr)
|
|
+ return -ENOMEM;
|
|
+
|
|
+ rc = gpio_request(gpio, label);
|
|
+ if (rc) {
|
|
+ devres_free(dr);
|
|
+ return rc;
|
|
+ }
|
|
+
|
|
+ *dr = gpio;
|
|
+ devres_add(dev, dr);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+EXPORT_SYMBOL(devm_gpio_request);
|
|
+
|
|
+/**
|
|
+ * devm_gpio_free - free an interrupt
|
|
+ * @dev: device to free gpio for
|
|
+ * @gpio: gpio to free
|
|
+ *
|
|
+ * Except for the extra @dev argument, this function takes the
|
|
+ * same arguments and performs the same function as gpio_free().
|
|
+ * This function instead of gpio_free() should be used to manually
|
|
+ * free GPIOs allocated with devm_gpio_request().
|
|
+ */
|
|
+void devm_gpio_free(struct device *dev, unsigned int gpio)
|
|
+{
|
|
+
|
|
+ WARN_ON(devres_destroy(dev, devm_gpio_release, devm_gpio_match,
|
|
+ &gpio));
|
|
+ gpio_free(gpio);
|
|
+}
|
|
+EXPORT_SYMBOL(devm_gpio_free);
|
|
--- a/include/asm-generic/gpio.h
|
|
+++ b/include/asm-generic/gpio.h
|
|
@@ -175,6 +175,10 @@ extern int gpio_request_one(unsigned gpi
|
|
extern int gpio_request_array(const struct gpio *array, size_t num);
|
|
extern void gpio_free_array(const struct gpio *array, size_t num);
|
|
|
|
+/* bindings for managed devices that want to request gpios */
|
|
+int devm_gpio_request(struct device *dev, unsigned gpio, const char *label);
|
|
+void devm_gpio_free(struct device *dev, unsigned int gpio);
|
|
+
|
|
#ifdef CONFIG_GPIO_SYSFS
|
|
|
|
/*
|