167 lines
4.7 KiB
Diff
167 lines
4.7 KiB
Diff
From 4b629d2e8fd9a762fd3f107c525bf2476ba7fe86 Mon Sep 17 00:00:00 2001
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From: John Crispin <blogic@openwrt.org>
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Date: Tue, 12 Aug 2014 20:49:27 +0200
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Subject: [PATCH] GPIO: add named gpio exports
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Signed-off-by: John Crispin <blogic@openwrt.org>
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---
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drivers/gpio/gpiolib-of.c | 68 +++++++++++++++++++++++++++++++++++++++++
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drivers/gpio/gpiolib.c | 11 +++++--
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include/asm-generic/gpio.h | 5 +++
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include/linux/gpio/consumer.h | 8 +++++
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4 files changed, 90 insertions(+), 2 deletions(-)
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--- a/drivers/gpio/gpiolib-of.c
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+++ b/drivers/gpio/gpiolib-of.c
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@@ -21,6 +21,8 @@
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#include <linux/of_gpio.h>
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#include <linux/pinctrl/pinctrl.h>
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#include <linux/slab.h>
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+#include <linux/init.h>
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+#include <linux/platform_device.h>
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struct gpio_desc;
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@@ -302,3 +304,69 @@ void of_gpiochip_remove(struct gpio_chip
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if (chip->of_node)
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of_node_put(chip->of_node);
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}
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+
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+static struct of_device_id gpio_export_ids[] = {
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+ { .compatible = "gpio-export" },
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+ { /* sentinel */ }
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+};
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+
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+static int __init of_gpio_export_probe(struct platform_device *pdev)
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+{
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+ struct device_node *np = pdev->dev.of_node;
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+ struct device_node *cnp;
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+ u32 val;
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+ int nb = 0;
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+
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+ for_each_child_of_node(np, cnp) {
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+ const char *name = NULL;
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+ int gpio;
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+ bool dmc;
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+ int max_gpio = 1;
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+ int i;
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+
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+ of_property_read_string(cnp, "gpio-export,name", &name);
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+
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+ if (!name)
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+ max_gpio = of_gpio_count(cnp);
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+
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+ for (i = 0; i < max_gpio; i++) {
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+ unsigned flags = 0;
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+ enum of_gpio_flags of_flags;
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+
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+ gpio = of_get_gpio_flags(cnp, i, &of_flags);
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+
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+ if (of_flags == OF_GPIO_ACTIVE_LOW)
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+ flags |= GPIOF_ACTIVE_LOW;
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+
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+ if (!of_property_read_u32(cnp, "gpio-export,output", &val))
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+ flags |= val ? GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW;
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+ else
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+ flags |= GPIOF_IN;
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+
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+ if (devm_gpio_request_one(&pdev->dev, gpio, flags, name ? name : of_node_full_name(np)))
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+ continue;
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+
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+ dmc = of_property_read_bool(cnp, "gpio-export,direction_may_change");
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+ gpio_export_with_name(gpio, dmc, name);
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+ nb++;
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+ }
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+ }
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+
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+ dev_info(&pdev->dev, "%d gpio(s) exported\n", nb);
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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_export_driver = {
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+ .driver = {
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+ .name = "gpio-export",
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+ .owner = THIS_MODULE,
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+ .of_match_table = of_match_ptr(gpio_export_ids),
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+ },
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+};
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+
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+static int __init of_gpio_export_init(void)
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+{
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+ return platform_driver_probe(&gpio_export_driver, of_gpio_export_probe);
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+}
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+device_initcall(of_gpio_export_init);
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--- a/drivers/gpio/gpiolib.c
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+++ b/drivers/gpio/gpiolib.c
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@@ -798,7 +798,7 @@ static struct class gpio_class = {
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*
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* Returns zero on success, else an error.
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*/
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-int gpiod_export(struct gpio_desc *desc, bool direction_may_change)
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+int _gpiod_export(struct gpio_desc *desc, bool direction_may_change, const char *name)
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{
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unsigned long flags;
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int status;
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@@ -839,6 +839,9 @@ int gpiod_export(struct gpio_desc *desc,
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if (desc->chip->names && desc->chip->names[offset])
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ioname = desc->chip->names[offset];
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+ if (name)
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+ ioname = name;
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+
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dev = device_create_with_groups(&gpio_class, desc->chip->dev,
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MKDEV(0, 0), desc, gpio_groups,
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ioname ? ioname : "gpio%u",
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@@ -874,6 +877,12 @@ fail_unlock:
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gpiod_dbg(desc, "%s: status %d\n", __func__, status);
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return status;
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}
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+EXPORT_SYMBOL_GPL(_gpiod_export);
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+
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+int gpiod_export(struct gpio_desc *desc, bool direction_may_change)
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+{
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+ return _gpiod_export(desc, direction_may_change, NULL);
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+}
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EXPORT_SYMBOL_GPL(gpiod_export);
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static int match_export(struct device *dev, const void *data)
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--- a/include/asm-generic/gpio.h
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+++ b/include/asm-generic/gpio.h
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@@ -126,6 +126,11 @@ static inline int gpio_export(unsigned g
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return gpiod_export(gpio_to_desc(gpio), direction_may_change);
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}
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+static inline int gpio_export_with_name(unsigned gpio, bool direction_may_change, const char *name)
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+{
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+ return _gpiod_export(gpio_to_desc(gpio), direction_may_change, name);
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+}
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+
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static inline int gpio_export_link(struct device *dev, const char *name,
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unsigned gpio)
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{
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--- a/include/linux/gpio/consumer.h
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+++ b/include/linux/gpio/consumer.h
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@@ -219,6 +219,7 @@ static inline struct gpio_chip *gpiod_to
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#if IS_ENABLED(CONFIG_GPIOLIB) && IS_ENABLED(CONFIG_GPIO_SYSFS)
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+int _gpiod_export(struct gpio_desc *desc, bool direction_may_change, const char *name);
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int gpiod_export(struct gpio_desc *desc, bool direction_may_change);
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int gpiod_export_link(struct device *dev, const char *name,
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struct gpio_desc *desc);
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@@ -227,6 +228,13 @@ void gpiod_unexport(struct gpio_desc *de
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#else /* CONFIG_GPIOLIB && CONFIG_GPIO_SYSFS */
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+static inline int _gpiod_export(struct gpio_desc *desc,
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+ bool direction_may_change,
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+ const char *name)
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+{
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+ return -ENOSYS;
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+}
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+
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static inline int gpiod_export(struct gpio_desc *desc,
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bool direction_may_change)
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{
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