170 lines
4.6 KiB
Diff
170 lines
4.6 KiB
Diff
From cc809a441d8f2924f785eb863dfa6aef47a25b0b 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 30/36] 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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@@ -23,6 +23,8 @@
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#include <linux/pinctrl/pinctrl.h>
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#include <linux/slab.h>
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#include <linux/gpio/machine.h>
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+#include <linux/init.h>
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+#include <linux/platform_device.h>
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#include "gpiolib.h"
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@@ -450,3 +452,73 @@
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gpiochip_remove_pin_ranges(chip);
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of_node_put(chip->of_node);
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}
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+
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+#ifdef CONFIG_GPIO_SYSFS
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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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+
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+#endif
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--- a/include/asm-generic/gpio.h
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+++ b/include/asm-generic/gpio.h
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@@ -122,6 +122,12 @@
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return gpiod_export(gpio_to_desc(gpio), direction_may_change);
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}
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+int __gpiod_export(struct gpio_desc *desc, bool direction_may_change, const char *name);
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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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@@ -427,6 +427,7 @@
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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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@@ -434,6 +435,13 @@
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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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--- a/drivers/gpio/gpiolib-sysfs.c
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+++ b/drivers/gpio/gpiolib-sysfs.c
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@@ -544,7 +544,7 @@
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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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struct gpio_chip *chip;
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struct gpiod_data *data;
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@@ -604,6 +604,8 @@
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offset = gpio_chip_hwgpio(desc);
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if (chip->names && chip->names[offset])
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ioname = chip->names[offset];
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+ if (name)
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+ ioname = name;
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dev = device_create_with_groups(&gpio_class, chip->dev,
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MKDEV(0, 0), data, gpio_groups,
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@@ -625,6 +627,12 @@
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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 *desc)
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