1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Internal GPIO functions. 4 * 5 * Copyright (C) 2013, Intel Corporation 6 * Author: Mika Westerberg <mika.westerberg@linux.intel.com> 7 */ 8 9 #ifndef GPIOLIB_H 10 #define GPIOLIB_H 11 12 #include <linux/gpio/driver.h> 13 #include <linux/gpio/consumer.h> /* for enum gpiod_flags */ 14 #include <linux/err.h> 15 #include <linux/device.h> 16 #include <linux/module.h> 17 #include <linux/cdev.h> 18 19 #define GPIOCHIP_NAME "gpiochip" 20 21 /** 22 * struct gpio_device - internal state container for GPIO devices 23 * @id: numerical ID number for the GPIO chip 24 * @dev: the GPIO device struct 25 * @chrdev: character device for the GPIO device 26 * @mockdev: class device used by the deprecated sysfs interface (may be 27 * NULL) 28 * @owner: helps prevent removal of modules exporting active GPIOs 29 * @chip: pointer to the corresponding gpiochip, holding static 30 * data for this device 31 * @descs: array of ngpio descriptors. 32 * @ngpio: the number of GPIO lines on this GPIO device, equal to the size 33 * of the @descs array. 34 * @base: GPIO base in the DEPRECATED global Linux GPIO numberspace, assigned 35 * at device creation time. 36 * @label: a descriptive name for the GPIO device, such as the part number 37 * or name of the IP component in a System on Chip. 38 * @data: per-instance data assigned by the driver 39 * @list: links gpio_device:s together for traversal 40 * 41 * This state container holds most of the runtime variable data 42 * for a GPIO device and can hold references and live on after the 43 * GPIO chip has been removed, if it is still being used from 44 * userspace. 45 */ 46 struct gpio_device { 47 int id; 48 struct device dev; 49 struct cdev chrdev; 50 struct device *mockdev; 51 struct module *owner; 52 struct gpio_chip *chip; 53 struct gpio_desc *descs; 54 int base; 55 u16 ngpio; 56 const char *label; 57 void *data; 58 struct list_head list; 59 struct atomic_notifier_head notifier; 60 61 #ifdef CONFIG_PINCTRL 62 /* 63 * If CONFIG_PINCTRL is enabled, then gpio controllers can optionally 64 * describe the actual pin range which they serve in an SoC. This 65 * information would be used by pinctrl subsystem to configure 66 * corresponding pins for gpio usage. 67 */ 68 struct list_head pin_ranges; 69 #endif 70 }; 71 72 /* gpio suffixes used for ACPI and device tree lookup */ 73 static __maybe_unused const char * const gpio_suffixes[] = { "gpios", "gpio" }; 74 75 struct gpio_array { 76 struct gpio_desc **desc; 77 unsigned int size; 78 struct gpio_chip *chip; 79 unsigned long *get_mask; 80 unsigned long *set_mask; 81 unsigned long invert_mask[]; 82 }; 83 84 struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip, 85 unsigned int hwnum); 86 int gpiod_get_array_value_complex(bool raw, bool can_sleep, 87 unsigned int array_size, 88 struct gpio_desc **desc_array, 89 struct gpio_array *array_info, 90 unsigned long *value_bitmap); 91 int gpiod_set_array_value_complex(bool raw, bool can_sleep, 92 unsigned int array_size, 93 struct gpio_desc **desc_array, 94 struct gpio_array *array_info, 95 unsigned long *value_bitmap); 96 97 extern spinlock_t gpio_lock; 98 extern struct list_head gpio_devices; 99 100 struct gpio_desc { 101 struct gpio_device *gdev; 102 unsigned long flags; 103 /* flag symbols are bit numbers */ 104 #define FLAG_REQUESTED 0 105 #define FLAG_IS_OUT 1 106 #define FLAG_EXPORT 2 /* protected by sysfs_lock */ 107 #define FLAG_SYSFS 3 /* exported via /sys/class/gpio/control */ 108 #define FLAG_ACTIVE_LOW 6 /* value has active low */ 109 #define FLAG_OPEN_DRAIN 7 /* Gpio is open drain type */ 110 #define FLAG_OPEN_SOURCE 8 /* Gpio is open source type */ 111 #define FLAG_USED_AS_IRQ 9 /* GPIO is connected to an IRQ */ 112 #define FLAG_IRQ_IS_ENABLED 10 /* GPIO is connected to an enabled IRQ */ 113 #define FLAG_IS_HOGGED 11 /* GPIO is hogged */ 114 #define FLAG_TRANSITORY 12 /* GPIO may lose value in sleep or reset */ 115 #define FLAG_PULL_UP 13 /* GPIO has pull up enabled */ 116 #define FLAG_PULL_DOWN 14 /* GPIO has pull down enabled */ 117 #define FLAG_BIAS_DISABLE 15 /* GPIO has pull disabled */ 118 119 /* Connection label */ 120 const char *label; 121 /* Name of the GPIO */ 122 const char *name; 123 #ifdef CONFIG_OF_DYNAMIC 124 struct device_node *hog; 125 #endif 126 }; 127 128 int gpiod_request(struct gpio_desc *desc, const char *label); 129 void gpiod_free(struct gpio_desc *desc); 130 int gpiod_configure_flags(struct gpio_desc *desc, const char *con_id, 131 unsigned long lflags, enum gpiod_flags dflags); 132 int gpiod_hog(struct gpio_desc *desc, const char *name, 133 unsigned long lflags, enum gpiod_flags dflags); 134 135 /* 136 * Return the GPIO number of the passed descriptor relative to its chip 137 */ 138 static inline int gpio_chip_hwgpio(const struct gpio_desc *desc) 139 { 140 return desc - &desc->gdev->descs[0]; 141 } 142 143 /* With descriptor prefix */ 144 145 #define gpiod_emerg(desc, fmt, ...) \ 146 pr_emerg("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?",\ 147 ##__VA_ARGS__) 148 #define gpiod_crit(desc, fmt, ...) \ 149 pr_crit("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \ 150 ##__VA_ARGS__) 151 #define gpiod_err(desc, fmt, ...) \ 152 pr_err("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \ 153 ##__VA_ARGS__) 154 #define gpiod_warn(desc, fmt, ...) \ 155 pr_warn("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \ 156 ##__VA_ARGS__) 157 #define gpiod_info(desc, fmt, ...) \ 158 pr_info("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \ 159 ##__VA_ARGS__) 160 #define gpiod_dbg(desc, fmt, ...) \ 161 pr_debug("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?",\ 162 ##__VA_ARGS__) 163 164 /* With chip prefix */ 165 166 #define chip_emerg(chip, fmt, ...) \ 167 dev_emerg(&chip->gpiodev->dev, "(%s): " fmt, chip->label, ##__VA_ARGS__) 168 #define chip_crit(chip, fmt, ...) \ 169 dev_crit(&chip->gpiodev->dev, "(%s): " fmt, chip->label, ##__VA_ARGS__) 170 #define chip_err(chip, fmt, ...) \ 171 dev_err(&chip->gpiodev->dev, "(%s): " fmt, chip->label, ##__VA_ARGS__) 172 #define chip_warn(chip, fmt, ...) \ 173 dev_warn(&chip->gpiodev->dev, "(%s): " fmt, chip->label, ##__VA_ARGS__) 174 #define chip_info(chip, fmt, ...) \ 175 dev_info(&chip->gpiodev->dev, "(%s): " fmt, chip->label, ##__VA_ARGS__) 176 #define chip_dbg(chip, fmt, ...) \ 177 dev_dbg(&chip->gpiodev->dev, "(%s): " fmt, chip->label, ##__VA_ARGS__) 178 179 #ifdef CONFIG_GPIO_SYSFS 180 181 int gpiochip_sysfs_register(struct gpio_device *gdev); 182 void gpiochip_sysfs_unregister(struct gpio_device *gdev); 183 184 #else 185 186 static inline int gpiochip_sysfs_register(struct gpio_device *gdev) 187 { 188 return 0; 189 } 190 191 static inline void gpiochip_sysfs_unregister(struct gpio_device *gdev) 192 { 193 } 194 195 #endif /* CONFIG_GPIO_SYSFS */ 196 197 #endif /* GPIOLIB_H */ 198