ralink: add back the gpio_export_named() patch for 3.14

Signed-off-by: John Crispin <[email protected]>

SVN-Revision: 42176

target/linux/ramips/patches-3.14/0058-GPIO-add-named-gpio-exports.patch

@@ -0,0 +1,177 @@
+From 4b629d2e8fd9a762fd3f107c525bf2476ba7fe86 Mon Sep 17 00:00:00 2001
+From: John Crispin <[email protected]>
+Date: Tue, 12 Aug 2014 20:49:27 +0200
+Subject: [PATCH] GPIO: add named gpio exports
+
+Signed-off-by: John Crispin <[email protected]>
+---
+ drivers/gpio/gpiolib-of.c     |   68 +++++++++++++++++++++++++++++++++++++++++
+ drivers/gpio/gpiolib.c        |   11 +++++--
+ include/asm-generic/gpio.h    |    5 +++
+ include/linux/gpio/consumer.h |    8 +++++
+ 4 files changed, 90 insertions(+), 2 deletions(-)
+
+diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
+index e0a98f5..f16f271 100644
+--- a/drivers/gpio/gpiolib-of.c
++++ b/drivers/gpio/gpiolib-of.c
+@@ -21,6 +21,8 @@
+ #include <linux/of_gpio.h>
+ #include <linux/pinctrl/pinctrl.h>
+ #include <linux/slab.h>
++#include <linux/init.h>
++#include <linux/platform_device.h>
+ 
+ struct gpio_desc;
+ 
+@@ -296,3 +298,69 @@ void of_gpiochip_remove(struct gpio_chip *chip)
+ 	if (chip->of_node)
+ 		of_node_put(chip->of_node);
+ }
++
++static struct of_device_id gpio_export_ids[] = {
++	{ .compatible = "gpio-export" },
++	{ /* sentinel */ }
++};
++
++static int __init of_gpio_export_probe(struct platform_device *pdev)
++{
++	struct device_node *np = pdev->dev.of_node;
++	struct device_node *cnp;
++	u32 val;
++	int nb = 0;
++
++	for_each_child_of_node(np, cnp) {
++		const char *name = NULL;
++		int gpio;
++		bool dmc;
++		int max_gpio = 1;
++		int i;
++
++		of_property_read_string(cnp, "gpio-export,name", &name);
++
++		if (!name)
++			max_gpio = of_gpio_count(cnp);
++
++		for (i = 0; i < max_gpio; i++) {
++			unsigned flags = 0;
++			enum of_gpio_flags of_flags;
++
++			gpio = of_get_gpio_flags(cnp, i, &of_flags);
++
++			if (of_flags == OF_GPIO_ACTIVE_LOW)
++				flags |= GPIOF_ACTIVE_LOW;
++
++			if (!of_property_read_u32(cnp, "gpio-export,output", &val))
++				flags |= val ? GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW;
++			else
++				flags |= GPIOF_IN;
++
++			if (devm_gpio_request_one(&pdev->dev, gpio, flags, name ? name : of_node_full_name(np)))
++				continue;
++
++			dmc = of_property_read_bool(cnp, "gpio-export,direction_may_change");
++			gpio_export_with_name(gpio, dmc, name);
++			nb++;
++		}
++	}
++
++	dev_info(&pdev->dev, "%d gpio(s) exported\n", nb);
++
++	return 0;
++}
++
++static struct platform_driver gpio_export_driver = {
++	.driver		= {
++		.name		= "gpio-export",
++		.owner	= THIS_MODULE,
++		.of_match_table	= of_match_ptr(gpio_export_ids),
++	},
++};
++
++static int __init of_gpio_export_init(void)
++{
++	return platform_driver_probe(&gpio_export_driver, of_gpio_export_probe);
++}
++device_initcall(of_gpio_export_init);
+diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
+index 50c4922..aece9f1 100644
+--- a/drivers/gpio/gpiolib.c
++++ b/drivers/gpio/gpiolib.c
+@@ -803,7 +803,7 @@ static struct class gpio_class = {
+  *
+  * Returns zero on success, else an error.
+  */
+-int gpiod_export(struct gpio_desc *desc, bool direction_may_change)
++int _gpiod_export(struct gpio_desc *desc, bool direction_may_change, const char *name)
+ {
+ 	unsigned long		flags;
+ 	int			status;
+@@ -843,7 +843,8 @@ int gpiod_export(struct gpio_desc *desc, bool direction_may_change)
+ 	offset = gpio_chip_hwgpio(desc);
+ 	if (desc->chip->names && desc->chip->names[offset])
+ 		ioname = desc->chip->names[offset];
+-
++	if (name)
++		ioname = name;
+ 	dev = device_create(&gpio_class, desc->chip->dev, MKDEV(0, 0),
+ 			    desc, ioname ? ioname : "gpio%u",
+ 			    desc_to_gpio(desc));
+@@ -880,6 +881,12 @@ fail_unlock:
+ 	gpiod_dbg(desc, "%s: status %d\n", __func__, status);
+ 	return status;
+ }
++EXPORT_SYMBOL_GPL(_gpiod_export);
++
++int gpiod_export(struct gpio_desc *desc, bool direction_may_change)
++{
++	return _gpiod_export(desc, direction_may_change, NULL);
++}
+ EXPORT_SYMBOL_GPL(gpiod_export);
+ 
+ static int match_export(struct device *dev, const void *data)
+diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h
+index a5f56a0..70a32ee 100644
+--- a/include/asm-generic/gpio.h
++++ b/include/asm-generic/gpio.h
+@@ -126,6 +126,11 @@ static inline int gpio_export(unsigned gpio, bool direction_may_change)
+ 	return gpiod_export(gpio_to_desc(gpio), direction_may_change);
+ }
+ 
++static inline int gpio_export_with_name(unsigned gpio, bool direction_may_change, const char *name)
++{
++	return _gpiod_export(gpio_to_desc(gpio), direction_may_change, name);
++}
++
+ static inline int gpio_export_link(struct device *dev, const char *name,
+ 				   unsigned gpio)
+ {
+diff --git a/include/linux/gpio/consumer.h b/include/linux/gpio/consumer.h
+index 7a8144f..085c31c 100644
+--- a/include/linux/gpio/consumer.h
++++ b/include/linux/gpio/consumer.h
+@@ -219,6 +219,7 @@ static inline struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc)
+ 
+ #if IS_ENABLED(CONFIG_GPIOLIB) && IS_ENABLED(CONFIG_GPIO_SYSFS)
+ 
++int _gpiod_export(struct gpio_desc *desc, bool direction_may_change, const char *name);
+ int gpiod_export(struct gpio_desc *desc, bool direction_may_change);
+ int gpiod_export_link(struct device *dev, const char *name,
+ 		      struct gpio_desc *desc);
+@@ -227,6 +228,13 @@ void gpiod_unexport(struct gpio_desc *desc);
+ 
+ #else  /* CONFIG_GPIOLIB && CONFIG_GPIO_SYSFS */
+ 
++static inline int _gpiod_export(struct gpio_desc *desc,
++			       bool direction_may_change,
++			       const char *name)
++{
++	return -ENOSYS;
++}
++
+ static inline int gpiod_export(struct gpio_desc *desc,
+ 			       bool direction_may_change)
+ {
+-- 
+1.7.10.4
+