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drivers/gpio/devres.c
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/* * drivers/gpio/devres.c - managed gpio resources * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 * as published by the Free Software Foundation. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * * This file is based on kernel/irq/devres.c * |
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* Copyright (c) 2011 John Crispin <john@phrozen.org> |
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*/ #include <linux/module.h> |
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#include <linux/err.h> |
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#include <linux/gpio.h> |
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#include <linux/gpio/consumer.h> |
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#include <linux/device.h> #include <linux/gfp.h> |
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#include "gpiolib.h" |
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static void devm_gpiod_release(struct device *dev, void *res) { struct gpio_desc **desc = res; gpiod_put(*desc); } static int devm_gpiod_match(struct device *dev, void *res, void *data) { struct gpio_desc **this = res, **gpio = data; return *this == *gpio; } |
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static void devm_gpiod_release_array(struct device *dev, void *res) { struct gpio_descs **descs = res; gpiod_put_array(*descs); } static int devm_gpiod_match_array(struct device *dev, void *res, void *data) { struct gpio_descs **this = res, **gpios = data; return *this == *gpios; } |
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/** * devm_gpiod_get - Resource-managed gpiod_get() * @dev: GPIO consumer * @con_id: function within the GPIO consumer |
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* @flags: optional GPIO initialization flags |
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* * Managed gpiod_get(). GPIO descriptors returned from this function are * automatically disposed on driver detach. See gpiod_get() for detailed * information about behavior and return values. */ |
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struct gpio_desc *__must_check devm_gpiod_get(struct device *dev, |
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const char *con_id, enum gpiod_flags flags) |
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{ |
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return devm_gpiod_get_index(dev, con_id, 0, flags); |
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} |
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EXPORT_SYMBOL(devm_gpiod_get); |
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/** |
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* devm_gpiod_get_optional - Resource-managed gpiod_get_optional() * @dev: GPIO consumer * @con_id: function within the GPIO consumer |
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* @flags: optional GPIO initialization flags |
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* * Managed gpiod_get_optional(). GPIO descriptors returned from this function * are automatically disposed on driver detach. See gpiod_get_optional() for * detailed information about behavior and return values. */ |
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struct gpio_desc *__must_check devm_gpiod_get_optional(struct device *dev, |
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const char *con_id, enum gpiod_flags flags) |
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{ |
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return devm_gpiod_get_index_optional(dev, con_id, 0, flags); |
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} |
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EXPORT_SYMBOL(devm_gpiod_get_optional); |
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/** |
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* devm_gpiod_get_index - Resource-managed gpiod_get_index() * @dev: GPIO consumer * @con_id: function within the GPIO consumer * @idx: index of the GPIO to obtain in the consumer |
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* @flags: optional GPIO initialization flags |
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* * Managed gpiod_get_index(). GPIO descriptors returned from this function are * automatically disposed on driver detach. See gpiod_get_index() for detailed * information about behavior and return values. */ |
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struct gpio_desc *__must_check devm_gpiod_get_index(struct device *dev, |
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const char *con_id, |
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unsigned int idx, enum gpiod_flags flags) |
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{ struct gpio_desc **dr; struct gpio_desc *desc; |
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dr = devres_alloc(devm_gpiod_release, sizeof(struct gpio_desc *), |
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GFP_KERNEL); if (!dr) return ERR_PTR(-ENOMEM); |
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desc = gpiod_get_index(dev, con_id, idx, flags); |
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if (IS_ERR(desc)) { devres_free(dr); return desc; } *dr = desc; devres_add(dev, dr); |
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return desc; |
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} |
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EXPORT_SYMBOL(devm_gpiod_get_index); |
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/** |
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* devm_fwnode_get_index_gpiod_from_child - get a GPIO descriptor from a * device's child node |
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* @dev: GPIO consumer |
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* @con_id: function within the GPIO consumer |
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* @index: index of the GPIO to obtain in the consumer |
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* @child: firmware node (child of @dev) |
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* @flags: GPIO initialization flags |
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* @label: label to attach to the requested GPIO |
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* * GPIO descriptors returned from this function are automatically disposed on * driver detach. |
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* |
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* On successful request the GPIO pin is configured in accordance with |
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* provided @flags. |
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*/ |
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struct gpio_desc *devm_fwnode_get_index_gpiod_from_child(struct device *dev, const char *con_id, int index, struct fwnode_handle *child, enum gpiod_flags flags, const char *label) |
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{ |
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char prop_name[32]; /* 32 is max size of property name */ |
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struct gpio_desc **dr; struct gpio_desc *desc; |
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unsigned int i; |
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dr = devres_alloc(devm_gpiod_release, sizeof(struct gpio_desc *), GFP_KERNEL); if (!dr) return ERR_PTR(-ENOMEM); |
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for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { |
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if (con_id) snprintf(prop_name, sizeof(prop_name), "%s-%s", |
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con_id, gpio_suffixes[i]); |
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else snprintf(prop_name, sizeof(prop_name), "%s", |
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gpio_suffixes[i]); |
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|
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desc = fwnode_get_named_gpiod(child, prop_name, index, flags, label); |
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if (!IS_ERR(desc) || (PTR_ERR(desc) != -ENOENT)) |
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break; } |
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if (IS_ERR(desc)) { devres_free(dr); return desc; } *dr = desc; devres_add(dev, dr); return desc; } |
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EXPORT_SYMBOL(devm_fwnode_get_index_gpiod_from_child); |
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/** |
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* devm_gpiod_get_index_optional - Resource-managed gpiod_get_index_optional() * @dev: GPIO consumer * @con_id: function within the GPIO consumer * @index: index of the GPIO to obtain in the consumer |
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* @flags: optional GPIO initialization flags |
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* * Managed gpiod_get_index_optional(). GPIO descriptors returned from this * function are automatically disposed on driver detach. See * gpiod_get_index_optional() for detailed information about behavior and * return values. */ |
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struct gpio_desc *__must_check devm_gpiod_get_index_optional(struct device *dev, |
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const char *con_id, |
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unsigned int index, |
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enum gpiod_flags flags) |
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{ struct gpio_desc *desc; |
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desc = devm_gpiod_get_index(dev, con_id, index, flags); |
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if (IS_ERR(desc)) { if (PTR_ERR(desc) == -ENOENT) return NULL; } return desc; } |
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EXPORT_SYMBOL(devm_gpiod_get_index_optional); |
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/** |
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* devm_gpiod_get_array - Resource-managed gpiod_get_array() * @dev: GPIO consumer * @con_id: function within the GPIO consumer * @flags: optional GPIO initialization flags * * Managed gpiod_get_array(). GPIO descriptors returned from this function are * automatically disposed on driver detach. See gpiod_get_array() for detailed * information about behavior and return values. */ struct gpio_descs *__must_check devm_gpiod_get_array(struct device *dev, const char *con_id, enum gpiod_flags flags) { struct gpio_descs **dr; struct gpio_descs *descs; dr = devres_alloc(devm_gpiod_release_array, sizeof(struct gpio_descs *), GFP_KERNEL); if (!dr) return ERR_PTR(-ENOMEM); descs = gpiod_get_array(dev, con_id, flags); if (IS_ERR(descs)) { devres_free(dr); return descs; } *dr = descs; devres_add(dev, dr); return descs; } EXPORT_SYMBOL(devm_gpiod_get_array); /** * devm_gpiod_get_array_optional - Resource-managed gpiod_get_array_optional() * @dev: GPIO consumer * @con_id: function within the GPIO consumer * @flags: optional GPIO initialization flags * * Managed gpiod_get_array_optional(). GPIO descriptors returned from this * function are automatically disposed on driver detach. * See gpiod_get_array_optional() for detailed information about behavior and * return values. */ struct gpio_descs *__must_check devm_gpiod_get_array_optional(struct device *dev, const char *con_id, enum gpiod_flags flags) { struct gpio_descs *descs; descs = devm_gpiod_get_array(dev, con_id, flags); if (IS_ERR(descs) && (PTR_ERR(descs) == -ENOENT)) return NULL; return descs; } EXPORT_SYMBOL(devm_gpiod_get_array_optional); /** |
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* devm_gpiod_put - Resource-managed gpiod_put() |
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* @dev: GPIO consumer |
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* @desc: GPIO descriptor to dispose of * * Dispose of a GPIO descriptor obtained with devm_gpiod_get() or * devm_gpiod_get_index(). Normally this function will not be called as the GPIO * will be disposed of by the resource management code. */ void devm_gpiod_put(struct device *dev, struct gpio_desc *desc) { WARN_ON(devres_release(dev, devm_gpiod_release, devm_gpiod_match, &desc)); } EXPORT_SYMBOL(devm_gpiod_put); |
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/** * devm_gpiod_put_array - Resource-managed gpiod_put_array() |
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* @dev: GPIO consumer |
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* @descs: GPIO descriptor array to dispose of * * Dispose of an array of GPIO descriptors obtained with devm_gpiod_get_array(). * Normally this function will not be called as the GPIOs will be disposed of * by the resource management code. */ void devm_gpiod_put_array(struct device *dev, struct gpio_descs *descs) { WARN_ON(devres_release(dev, devm_gpiod_release_array, devm_gpiod_match_array, &descs)); } EXPORT_SYMBOL(devm_gpiod_put_array); |
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static void devm_gpio_release(struct device *dev, void *res) { unsigned *gpio = res; gpio_free(*gpio); } static int devm_gpio_match(struct device *dev, void *res, void *data) { unsigned *this = res, *gpio = data; return *this == *gpio; } /** |
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* devm_gpio_request - request a GPIO for a managed device * @dev: device to request the GPIO for * @gpio: GPIO to allocate * @label: the name of the requested GPIO |
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* * Except for the extra @dev argument, this function takes the * same arguments and performs the same function as * gpio_request(). GPIOs requested with this function will be * automatically freed on driver detach. * * If an GPIO allocated with this function needs to be freed * separately, devm_gpio_free() must be used. */ int devm_gpio_request(struct device *dev, unsigned gpio, const char *label) { unsigned *dr; int rc; dr = devres_alloc(devm_gpio_release, sizeof(unsigned), GFP_KERNEL); if (!dr) return -ENOMEM; rc = gpio_request(gpio, label); if (rc) { devres_free(dr); return rc; } *dr = gpio; devres_add(dev, dr); return 0; } EXPORT_SYMBOL(devm_gpio_request); /** |
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* devm_gpio_request_one - request a single GPIO with initial setup * @dev: device to request for * @gpio: the GPIO number * @flags: GPIO configuration as specified by GPIOF_* * @label: a literal description string of this GPIO */ int devm_gpio_request_one(struct device *dev, unsigned gpio, unsigned long flags, const char *label) { unsigned *dr; int rc; dr = devres_alloc(devm_gpio_release, sizeof(unsigned), GFP_KERNEL); if (!dr) return -ENOMEM; rc = gpio_request_one(gpio, flags, label); if (rc) { devres_free(dr); return rc; } *dr = gpio; devres_add(dev, dr); return 0; } |
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EXPORT_SYMBOL(devm_gpio_request_one); |
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/** |
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* devm_gpio_free - free a GPIO * @dev: device to free GPIO for * @gpio: GPIO to free |
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* * Except for the extra @dev argument, this function takes the * same arguments and performs the same function as gpio_free(). * This function instead of gpio_free() should be used to manually * free GPIOs allocated with devm_gpio_request(). */ void devm_gpio_free(struct device *dev, unsigned int gpio) { |
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WARN_ON(devres_release(dev, devm_gpio_release, devm_gpio_match, |
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&gpio)); |
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} EXPORT_SYMBOL(devm_gpio_free); |