drivers/gpio/gpiolib.h

   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 */