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 #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 blocking_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 *gc, unsigned int hwnum);
  85 int gpiod_get_array_value_complex(bool raw, bool can_sleep,
  86                                   unsigned int array_size,
  87                                   struct gpio_desc **desc_array,
  88                                   struct gpio_array *array_info,
  89                                   unsigned long *value_bitmap);
  90 int gpiod_set_array_value_complex(bool raw, bool can_sleep,
  91                                   unsigned int array_size,
  92                                   struct gpio_desc **desc_array,
  93                                   struct gpio_array *array_info,
  94                                   unsigned long *value_bitmap);
  95
  96 extern spinlock_t gpio_lock;
  97 extern struct list_head gpio_devices;
  98
  99 struct gpio_desc {
 100         struct gpio_device      *gdev;
 101         unsigned long           flags;
 102 /* flag symbols are bit numbers */
 103 #define FLAG_REQUESTED  0
 104 #define FLAG_IS_OUT     1
 105 #define FLAG_EXPORT     2       /* protected by sysfs_lock */
 106 #define FLAG_SYSFS      3       /* exported via /sys/class/gpio/control */
 107 #define FLAG_ACTIVE_LOW 6       /* value has active low */
 108 #define FLAG_OPEN_DRAIN 7       /* Gpio is open drain type */
 109 #define FLAG_OPEN_SOURCE 8      /* Gpio is open source type */
 110 #define FLAG_USED_AS_IRQ 9      /* GPIO is connected to an IRQ */
 111 #define FLAG_IRQ_IS_ENABLED 10  /* GPIO is connected to an enabled IRQ */
 112 #define FLAG_IS_HOGGED  11      /* GPIO is hogged */
 113 #define FLAG_TRANSITORY 12      /* GPIO may lose value in sleep or reset */
 114 #define FLAG_PULL_UP    13      /* GPIO has pull up enabled */
 115 #define FLAG_PULL_DOWN  14      /* GPIO has pull down enabled */
 116 #define FLAG_BIAS_DISABLE    15 /* GPIO has pull disabled */
 117 #define FLAG_EDGE_RISING     16 /* GPIO CDEV detects rising edge events */
 118 #define FLAG_EDGE_FALLING    17 /* GPIO CDEV detects falling edge events */
 119 #define FLAG_EVENT_CLOCK_REALTIME       18 /* GPIO CDEV reports REALTIME timestamps in events */
 120
 121         /* Connection label */
 122         const char              *label;
 123         /* Name of the GPIO */
 124         const char              *name;
 125 #ifdef CONFIG_OF_DYNAMIC
 126         struct device_node      *hog;
 127 #endif
 128 #ifdef CONFIG_GPIO_CDEV
 129         /* debounce period in microseconds */
 130         unsigned int            debounce_period_us;
 131 #endif
 132 };
 133
 134 #define gpiod_not_found(desc)           (IS_ERR(desc) && PTR_ERR(desc) == -ENOENT)
 135
 136 int gpiod_request(struct gpio_desc *desc, const char *label);
 137 void gpiod_free(struct gpio_desc *desc);
 138 int gpiod_configure_flags(struct gpio_desc *desc, const char *con_id,
 139                 unsigned long lflags, enum gpiod_flags dflags);
 140 int gpio_set_debounce_timeout(struct gpio_desc *desc, unsigned int debounce);
 141 int gpiod_hog(struct gpio_desc *desc, const char *name,
 142                 unsigned long lflags, enum gpiod_flags dflags);
 143
 144 /*
 145  * Return the GPIO number of the passed descriptor relative to its chip
 146  */
 147 static inline int gpio_chip_hwgpio(const struct gpio_desc *desc)
 148 {
 149         return desc - &desc->gdev->descs[0];
 150 }
 151
 152 /* With descriptor prefix */
 153
 154 #define gpiod_emerg(desc, fmt, ...)                                            \
 155         pr_emerg("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?",\
 156                  ##__VA_ARGS__)
 157 #define gpiod_crit(desc, fmt, ...)                                             \
 158         pr_crit("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \
 159                  ##__VA_ARGS__)
 160 #define gpiod_err(desc, fmt, ...)                                              \
 161         pr_err("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?",  \
 162                  ##__VA_ARGS__)
 163 #define gpiod_warn(desc, fmt, ...)                                             \
 164         pr_warn("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \
 165                  ##__VA_ARGS__)
 166 #define gpiod_info(desc, fmt, ...)                                             \
 167         pr_info("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \
 168                  ##__VA_ARGS__)
 169 #define gpiod_dbg(desc, fmt, ...)                                              \
 170         pr_debug("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?",\
 171                  ##__VA_ARGS__)
 172
 173 /* With chip prefix */
 174
 175 #define chip_emerg(gc, fmt, ...)                                        \
 176         dev_emerg(&gc->gpiodev->dev, "(%s): " fmt, gc->label, ##__VA_ARGS__)
 177 #define chip_crit(gc, fmt, ...)                                 \
 178         dev_crit(&gc->gpiodev->dev, "(%s): " fmt, gc->label, ##__VA_ARGS__)
 179 #define chip_err(gc, fmt, ...)                                  \
 180         dev_err(&gc->gpiodev->dev, "(%s): " fmt, gc->label, ##__VA_ARGS__)
 181 #define chip_warn(gc, fmt, ...)                                 \
 182         dev_warn(&gc->gpiodev->dev, "(%s): " fmt, gc->label, ##__VA_ARGS__)
 183 #define chip_info(gc, fmt, ...)                                 \
 184         dev_info(&gc->gpiodev->dev, "(%s): " fmt, gc->label, ##__VA_ARGS__)
 185 #define chip_dbg(gc, fmt, ...)                                  \
 186         dev_dbg(&gc->gpiodev->dev, "(%s): " fmt, gc->label, ##__VA_ARGS__)
 187
 188 #endif /* GPIOLIB_H */