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