diff options
Diffstat (limited to 'target/linux')
| -rw-r--r-- | target/linux/ramips/patches-3.14/0058-GPIO-add-named-gpio-exports.patch | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/target/linux/ramips/patches-3.14/0058-GPIO-add-named-gpio-exports.patch b/target/linux/ramips/patches-3.14/0058-GPIO-add-named-gpio-exports.patch new file mode 100644 index 0000000000..b712a6b2d9 --- /dev/null +++ b/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 <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(-) + +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 + |