+++ /dev/null
-From 4b629d2e8fd9a762fd3f107c525bf2476ba7fe86 Mon Sep 17 00:00:00 2001
-From: John Crispin <blogic@openwrt.org>
-Date: Tue, 12 Aug 2014 20:49:27 +0200
-Subject: [PATCH] GPIO: add named gpio exports
-
-Signed-off-by: John Crispin <blogic@openwrt.org>
----
- 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(-)
-
---- 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;
-
-@@ -302,3 +304,69 @@ void of_gpiochip_remove(struct gpio_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);
---- a/drivers/gpio/gpiolib.c
-+++ b/drivers/gpio/gpiolib.c
-@@ -798,7 +798,7 @@ 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;
-@@ -839,6 +839,9 @@ int gpiod_export(struct gpio_desc *desc,
- if (desc->chip->names && desc->chip->names[offset])
- ioname = desc->chip->names[offset];
-
-+ if (name)
-+ ioname = name;
-+
- dev = device_create_with_groups(&gpio_class, desc->chip->dev,
- MKDEV(0, 0), desc, gpio_groups,
- ioname ? ioname : "gpio%u",
-@@ -874,6 +877,12 @@ 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)
---- a/include/asm-generic/gpio.h
-+++ b/include/asm-generic/gpio.h
-@@ -126,6 +126,11 @@ static inline int gpio_export(unsigned g
- 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)
- {
---- a/include/linux/gpio/consumer.h
-+++ b/include/linux/gpio/consumer.h
-@@ -219,6 +219,7 @@ static inline struct gpio_chip *gpiod_to
-
- #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 *de
-
- #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)
- {
projects / openwrt / svn-archive / archive.git / blobdiff