diff options
Diffstat (limited to 'target/linux/brcm63xx/patches-4.4/000-4.6-01-gpio-Add-devm_-apis-for-gpiochip_add_data-and-gpioch.patch')
| -rw-r--r-- | target/linux/brcm63xx/patches-4.4/000-4.6-01-gpio-Add-devm_-apis-for-gpiochip_add_data-and-gpioch.patch | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/target/linux/brcm63xx/patches-4.4/000-4.6-01-gpio-Add-devm_-apis-for-gpiochip_add_data-and-gpioch.patch b/target/linux/brcm63xx/patches-4.4/000-4.6-01-gpio-Add-devm_-apis-for-gpiochip_add_data-and-gpioch.patch new file mode 100644 index 0000000..ab2fb07 --- /dev/null +++ b/target/linux/brcm63xx/patches-4.4/000-4.6-01-gpio-Add-devm_-apis-for-gpiochip_add_data-and-gpioch.patch @@ -0,0 +1,115 @@ +From 0cf3292cde22f8843ae5d1eeb8466d8121243c1a Mon Sep 17 00:00:00 2001 +From: Laxman Dewangan <ldewangan@nvidia.com> +Date: Mon, 15 Feb 2016 16:32:09 +0530 +Subject: [PATCH] gpio: Add devm_ apis for gpiochip_add_data and + gpiochip_remove + +Add device managed APIs devm_gpiochip_add_data() and +devm_gpiochip_remove() for the APIs gpiochip_add_data() +and gpiochip_remove(). + +This helps in reducing code in error path and sometimes +removal of .remove callback for driver unbind. + +Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com> +--- + drivers/gpio/gpiolib.c | 74 +++++++++++++++++++++++++++++++++++++++++++++ + include/linux/gpio/driver.h | 4 +++ + 2 files changed, 78 insertions(+) + +--- a/drivers/gpio/gpiolib.c ++++ b/drivers/gpio/gpiolib.c +@@ -433,6 +433,80 @@ void gpiochip_remove(struct gpio_chip *c + } + EXPORT_SYMBOL_GPL(gpiochip_remove); + ++static void devm_gpio_chip_release(struct device *dev, void *res) ++{ ++ struct gpio_chip *chip = *(struct gpio_chip **)res; ++ ++ gpiochip_remove(chip); ++} ++ ++static int devm_gpio_chip_match(struct device *dev, void *res, void *data) ++ ++{ ++ struct gpio_chip **r = res; ++ ++ if (!r || !*r) { ++ WARN_ON(!r || !*r); ++ return 0; ++ } ++ ++ return *r == data; ++} ++ ++/** ++ * devm_gpiochip_add_data() - Resource manager piochip_add_data() ++ * @dev: the device pointer on which irq_chip belongs to. ++ * @chip: the chip to register, with chip->base initialized ++ * Context: potentially before irqs will work ++ * ++ * Returns a negative errno if the chip can't be registered, such as ++ * because the chip->base is invalid or already associated with a ++ * different chip. Otherwise it returns zero as a success code. ++ * ++ * The gpio chip automatically be released when the device is unbound. ++ */ ++int devm_gpiochip_add_data(struct device *dev, struct gpio_chip *chip, ++ void *data) ++{ ++ struct gpio_chip **ptr; ++ int ret; ++ ++ ptr = devres_alloc(devm_gpio_chip_release, sizeof(*ptr), ++ GFP_KERNEL); ++ if (!ptr) ++ return -ENOMEM; ++ ++ ret = gpiochip_add_data(chip, data); ++ if (ret < 0) { ++ devres_free(ptr); ++ return ret; ++ } ++ ++ *ptr = chip; ++ devres_add(dev, ptr); ++ ++ return 0; ++} ++EXPORT_SYMBOL_GPL(devm_gpiochip_add_data); ++ ++/** ++ * devm_gpiochip_remove() - Resource manager of gpiochip_remove() ++ * @dev: device for which which resource was allocated ++ * @chip: the chip to remove ++ * ++ * A gpio_chip with any GPIOs still requested may not be removed. ++ */ ++void devm_gpiochip_remove(struct device *dev, struct gpio_chip *chip) ++{ ++ int ret; ++ ++ ret = devres_release(dev, devm_gpio_chip_release, ++ devm_gpio_chip_match, chip); ++ if (!ret) ++ WARN_ON(ret); ++} ++EXPORT_SYMBOL_GPL(devm_gpiochip_remove); ++ + /** + * gpiochip_find() - iterator for locating a specific gpio_chip + * @data: data to pass to match function +--- a/include/linux/gpio/driver.h ++++ b/include/linux/gpio/driver.h +@@ -206,6 +206,10 @@ static inline int gpiochip_add(struct gp + return gpiochip_add_data(chip, NULL); + } + extern void gpiochip_remove(struct gpio_chip *chip); ++extern int devm_gpiochip_add_data(struct device *dev, struct gpio_chip *chip, ++ void *data); ++extern void devm_gpiochip_remove(struct device *dev, struct gpio_chip *chip); ++ + extern struct gpio_chip *gpiochip_find(void *data, + int (*match)(struct gpio_chip *chip, void *data)); + |