gpiolib-swnode.c (0ea5c948cb64bab5bc7a5516774eb8536f05aa0d) | gpiolib-swnode.c (9d50f95bc0d5df56f2591b950a251d90bffad094) |
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1// SPDX-License-Identifier: GPL-2.0+ 2/* 3 * Software Node helpers for the GPIO API 4 * 5 * Copyright 2022 Google LLC 6 */ | 1// SPDX-License-Identifier: GPL-2.0+ 2/* 3 * Software Node helpers for the GPIO API 4 * 5 * Copyright 2022 Google LLC 6 */ |
7 8#define pr_fmt(fmt) "gpiolib: swnode: " fmt 9 |
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7#include <linux/err.h> 8#include <linux/errno.h> | 10#include <linux/err.h> 11#include <linux/errno.h> |
12#include <linux/export.h> 13#include <linux/init.h> |
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9#include <linux/kernel.h> 10#include <linux/printk.h> 11#include <linux/property.h> 12#include <linux/string.h> 13 14#include <linux/gpio/consumer.h> 15#include <linux/gpio/driver.h> 16 17#include "gpiolib.h" 18#include "gpiolib-swnode.h" 19 | 14#include <linux/kernel.h> 15#include <linux/printk.h> 16#include <linux/property.h> 17#include <linux/string.h> 18 19#include <linux/gpio/consumer.h> 20#include <linux/gpio/driver.h> 21 22#include "gpiolib.h" 23#include "gpiolib-swnode.h" 24 |
25#define GPIOLIB_SWNODE_UNDEFINED_NAME "swnode-gpio-undefined" 26 |
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20static void swnode_format_propname(const char *con_id, char *propname, 21 size_t max_size) 22{ 23 /* 24 * Note we do not need to try both -gpios and -gpio suffixes, 25 * as, unlike OF and ACPI, we can fix software nodes to conform 26 * to the proper binding. 27 */ --- 7 unchanged lines hidden (view full) --- 35{ 36 const struct software_node *gdev_node; 37 struct gpio_device *gdev; 38 39 gdev_node = to_software_node(fwnode); 40 if (!gdev_node || !gdev_node->name) 41 return ERR_PTR(-EINVAL); 42 | 27static void swnode_format_propname(const char *con_id, char *propname, 28 size_t max_size) 29{ 30 /* 31 * Note we do not need to try both -gpios and -gpio suffixes, 32 * as, unlike OF and ACPI, we can fix software nodes to conform 33 * to the proper binding. 34 */ --- 7 unchanged lines hidden (view full) --- 42{ 43 const struct software_node *gdev_node; 44 struct gpio_device *gdev; 45 46 gdev_node = to_software_node(fwnode); 47 if (!gdev_node || !gdev_node->name) 48 return ERR_PTR(-EINVAL); 49 |
50 /* 51 * Check for a special node that identifies undefined GPIOs, this is 52 * primarily used as a key for internal chip selects in SPI bindings. 53 */ 54 if (IS_ENABLED(CONFIG_GPIO_SWNODE_UNDEFINED) && 55 !strcmp(gdev_node->name, GPIOLIB_SWNODE_UNDEFINED_NAME)) 56 return ERR_PTR(-ENOENT); 57 |
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43 gdev = gpio_device_find_by_label(gdev_node->name); 44 return gdev ?: ERR_PTR(-EPROBE_DEFER); 45} 46 47struct gpio_desc *swnode_find_gpio(struct fwnode_handle *fwnode, 48 const char *con_id, unsigned int idx, 49 unsigned long *flags) 50{ --- 65 unchanged lines hidden (view full) --- 116 while (fwnode_property_get_reference_args(fwnode, propname, NULL, 0, 117 count, &args) == 0) { 118 fwnode_handle_put(args.fwnode); 119 count++; 120 } 121 122 return count ?: -ENOENT; 123} | 58 gdev = gpio_device_find_by_label(gdev_node->name); 59 return gdev ?: ERR_PTR(-EPROBE_DEFER); 60} 61 62struct gpio_desc *swnode_find_gpio(struct fwnode_handle *fwnode, 63 const char *con_id, unsigned int idx, 64 unsigned long *flags) 65{ --- 65 unchanged lines hidden (view full) --- 131 while (fwnode_property_get_reference_args(fwnode, propname, NULL, 0, 132 count, &args) == 0) { 133 fwnode_handle_put(args.fwnode); 134 count++; 135 } 136 137 return count ?: -ENOENT; 138} |
139 140#if IS_ENABLED(CONFIG_GPIO_SWNODE_UNDEFINED) 141/* 142 * A special node that identifies undefined GPIOs, this is primarily used as 143 * a key for internal chip selects in SPI bindings. 144 */ 145const struct software_node swnode_gpio_undefined = { 146 .name = GPIOLIB_SWNODE_UNDEFINED_NAME, 147}; 148EXPORT_SYMBOL_NS_GPL(swnode_gpio_undefined, GPIO_SWNODE); 149 150static int __init swnode_gpio_init(void) 151{ 152 int ret; 153 154 ret = software_node_register(&swnode_gpio_undefined); 155 if (ret < 0) 156 pr_err("failed to register swnode: %d\n", ret); 157 158 return ret; 159} 160subsys_initcall(swnode_gpio_init); 161 162static void __exit swnode_gpio_cleanup(void) 163{ 164 software_node_unregister(&swnode_gpio_undefined); 165} 166__exitcall(swnode_gpio_cleanup); 167#endif |
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