drivers/gpio/gpiolib.h

   1 /*
   2  * Internal GPIO functions.
   3  *
   4  * Copyright (C) 2013, Intel Corporation
   5  * Author: Mika Westerberg <mika.westerberg@linux.intel.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #ifndef GPIOLIB_H
  13 #define GPIOLIB_H
  14
  15 #include <linux/gpio/driver.h>
  16 #include <linux/gpio/consumer.h> /* for enum gpiod_flags */
  17 #include <linux/err.h>
  18 #include <linux/device.h>
  19 #include <linux/module.h>
  20 #include <linux/cdev.h>
  21
  22 enum of_gpio_flags;
  23 enum gpio_lookup_flags;
  24 struct acpi_device;
  25
  26 /**
  27  * struct gpio_device - internal state container for GPIO devices
  28  * @id: numerical ID number for the GPIO chip
  29  * @dev: the GPIO device struct
  30  * @chrdev: character device for the GPIO device
  31  * @mockdev: class device used by the deprecated sysfs interface (may be
  32  * NULL)
  33  * @owner: helps prevent removal of modules exporting active GPIOs
  34  * @chip: pointer to the corresponding gpiochip, holding static
  35  * data for this device
  36  * @descs: array of ngpio descriptors.
  37  * @ngpio: the number of GPIO lines on this GPIO device, equal to the size
  38  * of the @descs array.
  39  * @base: GPIO base in the DEPRECATED global Linux GPIO numberspace, assigned
  40  * at device creation time.
  41  * @label: a descriptive name for the GPIO device, such as the part number
  42  * or name of the IP component in a System on Chip.
  43  * @data: per-instance data assigned by the driver
  44  * @list: links gpio_device:s together for traversal
  45  *
  46  * This state container holds most of the runtime variable data
  47  * for a GPIO device and can hold references and live on after the
  48  * GPIO chip has been removed, if it is still being used from
  49  * userspace.
  50  */
  51 struct gpio_device {
  52         int                     id;
  53         struct device           dev;
  54         struct cdev             chrdev;
  55         struct device           *mockdev;
  56         struct module           *owner;
  57         struct gpio_chip        *chip;
  58         struct gpio_desc        *descs;
  59         int                     base;
  60         u16                     ngpio;
  61         const char              *label;
  62         void                    *data;
  63         struct list_head        list;
  64
  65 #ifdef CONFIG_PINCTRL
  66         /*
  67          * If CONFIG_PINCTRL is enabled, then gpio controllers can optionally
  68          * describe the actual pin range which they serve in an SoC. This
  69          * information would be used by pinctrl subsystem to configure
  70          * corresponding pins for gpio usage.
  71          */
  72         struct list_head pin_ranges;
  73 #endif
  74 };
  75
  76 /**
  77  * struct acpi_gpio_info - ACPI GPIO specific information
  78  * @adev: reference to ACPI device which consumes GPIO resource
  79  * @flags: GPIO initialization flags
  80  * @gpioint: if %true this GPIO is of type GpioInt otherwise type is GpioIo
  81  * @polarity: interrupt polarity as provided by ACPI
  82  * @triggering: triggering type as provided by ACPI
  83  * @quirks: Linux specific quirks as provided by struct acpi_gpio_mapping
  84  */
  85 struct acpi_gpio_info {
  86         struct acpi_device *adev;
  87         enum gpiod_flags flags;
  88         bool gpioint;
  89         int polarity;
  90         int triggering;
  91         unsigned int quirks;
  92 };
  93
  94 /* gpio suffixes used for ACPI and device tree lookup */
  95 static __maybe_unused const char * const gpio_suffixes[] = { "gpios", "gpio" };
  96
  97 #ifdef CONFIG_OF_GPIO
  98 struct gpio_desc *of_find_gpio(struct device *dev,
  99                                const char *con_id,
 100                                unsigned int idx,
 101                                enum gpio_lookup_flags *flags);
 102 struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np,
 103                    const char *list_name, int index, enum of_gpio_flags *flags);
 104 int of_gpiochip_add(struct gpio_chip *gc);
 105 void of_gpiochip_remove(struct gpio_chip *gc);
 106 #else
 107 static inline struct gpio_desc *of_find_gpio(struct device *dev,
 108                                              const char *con_id,
 109                                              unsigned int idx,
 110                                              enum gpio_lookup_flags *flags)
 111 {
 112         return ERR_PTR(-ENOENT);
 113 }
 114 static inline struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np,
 115                    const char *list_name, int index, enum of_gpio_flags *flags)
 116 {
 117         return ERR_PTR(-ENOENT);
 118 }
 119 static inline int of_gpiochip_add(struct gpio_chip *gc) { return 0; }
 120 static inline void of_gpiochip_remove(struct gpio_chip *gc) { }
 121 #endif /* CONFIG_OF_GPIO */
 122
 123 #ifdef CONFIG_ACPI
 124 void acpi_gpiochip_add(struct gpio_chip *chip);
 125 void acpi_gpiochip_remove(struct gpio_chip *chip);
 126
 127 void acpi_gpiochip_request_interrupts(struct gpio_chip *chip);
 128 void acpi_gpiochip_free_interrupts(struct gpio_chip *chip);
 129
 130 int acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags,
 131                                  struct acpi_gpio_info *info);
 132
 133 struct gpio_desc *acpi_find_gpio(struct device *dev,
 134                                  const char *con_id,
 135                                  unsigned int idx,
 136                                  enum gpiod_flags *dflags,
 137                                  enum gpio_lookup_flags *lookupflags);
 138 struct gpio_desc *acpi_node_get_gpiod(struct fwnode_handle *fwnode,
 139                                       const char *propname, int index,
 140                                       struct acpi_gpio_info *info);
 141
 142 int acpi_gpio_count(struct device *dev, const char *con_id);
 143
 144 bool acpi_can_fallback_to_crs(struct acpi_device *adev, const char *con_id);
 145 #else
 146 static inline void acpi_gpiochip_add(struct gpio_chip *chip) { }
 147 static inline void acpi_gpiochip_remove(struct gpio_chip *chip) { }
 148
 149 static inline void
 150 acpi_gpiochip_request_interrupts(struct gpio_chip *chip) { }
 151
 152 static inline void
 153 acpi_gpiochip_free_interrupts(struct gpio_chip *chip) { }
 154
 155 static inline int
 156 acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, struct acpi_gpio_info *info)
 157 {
 158         return 0;
 159 }
 160
 161 static inline struct gpio_desc *
 162 acpi_find_gpio(struct device *dev, const char *con_id,
 163                unsigned int idx, enum gpiod_flags *dflags,
 164                enum gpio_lookup_flags *lookupflags)
 165 {
 166         return ERR_PTR(-ENOENT);
 167 }
 168 static inline struct gpio_desc *
 169 acpi_node_get_gpiod(struct fwnode_handle *fwnode, const char *propname,
 170                     int index, struct acpi_gpio_info *info)
 171 {
 172         return ERR_PTR(-ENXIO);
 173 }
 174 static inline int acpi_gpio_count(struct device *dev, const char *con_id)
 175 {
 176         return -ENODEV;
 177 }
 178
 179 static inline bool acpi_can_fallback_to_crs(struct acpi_device *adev,
 180                                             const char *con_id)
 181 {
 182         return false;
 183 }
 184 #endif
 185
 186 struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip, u16 hwnum);
 187 int gpiod_get_array_value_complex(bool raw, bool can_sleep,
 188                                   unsigned int array_size,
 189                                   struct gpio_desc **desc_array,
 190                                   int *value_array);
 191 int gpiod_set_array_value_complex(bool raw, bool can_sleep,
 192                                    unsigned int array_size,
 193                                    struct gpio_desc **desc_array,
 194                                    int *value_array);
 195
 196 /* This is just passed between gpiolib and devres */
 197 struct gpio_desc *gpiod_get_from_of_node(struct device_node *node,
 198                                          const char *propname, int index,
 199                                          enum gpiod_flags dflags,
 200                                          const char *label);
 201
 202 extern struct spinlock gpio_lock;
 203 extern struct list_head gpio_devices;
 204
 205 struct gpio_desc {
 206         struct gpio_device      *gdev;
 207         unsigned long           flags;
 208 /* flag symbols are bit numbers */
 209 #define FLAG_REQUESTED  0
 210 #define FLAG_IS_OUT     1
 211 #define FLAG_EXPORT     2       /* protected by sysfs_lock */
 212 #define FLAG_SYSFS      3       /* exported via /sys/class/gpio/control */
 213 #define FLAG_ACTIVE_LOW 6       /* value has active low */
 214 #define FLAG_OPEN_DRAIN 7       /* Gpio is open drain type */
 215 #define FLAG_OPEN_SOURCE 8      /* Gpio is open source type */
 216 #define FLAG_USED_AS_IRQ 9      /* GPIO is connected to an IRQ */
 217 #define FLAG_IS_HOGGED  11      /* GPIO is hogged */
 218 #define FLAG_TRANSITORY 12      /* GPIO may lose value in sleep or reset */
 219
 220         /* Connection label */
 221         const char              *label;
 222         /* Name of the GPIO */
 223         const char              *name;
 224 };
 225
 226 int gpiod_request(struct gpio_desc *desc, const char *label);
 227 void gpiod_free(struct gpio_desc *desc);
 228 int gpiod_configure_flags(struct gpio_desc *desc, const char *con_id,
 229                 unsigned long lflags, enum gpiod_flags dflags);
 230 int gpiod_hog(struct gpio_desc *desc, const char *name,
 231                 unsigned long lflags, enum gpiod_flags dflags);
 232
 233 /*
 234  * Return the GPIO number of the passed descriptor relative to its chip
 235  */
 236 static inline int gpio_chip_hwgpio(const struct gpio_desc *desc)
 237 {
 238         return desc - &desc->gdev->descs[0];
 239 }
 240
 241 void devprop_gpiochip_set_names(struct gpio_chip *chip,
 242                                 const struct fwnode_handle *fwnode);
 243
 244 /* With descriptor prefix */
 245
 246 #define gpiod_emerg(desc, fmt, ...)                                            \
 247         pr_emerg("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?",\
 248                  ##__VA_ARGS__)
 249 #define gpiod_crit(desc, fmt, ...)                                             \
 250         pr_crit("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \
 251                  ##__VA_ARGS__)
 252 #define gpiod_err(desc, fmt, ...)                                              \
 253         pr_err("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?",  \
 254                  ##__VA_ARGS__)
 255 #define gpiod_warn(desc, fmt, ...)                                             \
 256         pr_warn("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \
 257                  ##__VA_ARGS__)
 258 #define gpiod_info(desc, fmt, ...)                                             \
 259         pr_info("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \
 260                  ##__VA_ARGS__)
 261 #define gpiod_dbg(desc, fmt, ...)                                              \
 262         pr_debug("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?",\
 263                  ##__VA_ARGS__)
 264
 265 /* With chip prefix */
 266
 267 #define chip_emerg(chip, fmt, ...)                                      \
 268         dev_emerg(&chip->gpiodev->dev, "(%s): " fmt, chip->label, ##__VA_ARGS__)
 269 #define chip_crit(chip, fmt, ...)                                       \
 270         dev_crit(&chip->gpiodev->dev, "(%s): " fmt, chip->label, ##__VA_ARGS__)
 271 #define chip_err(chip, fmt, ...)                                        \
 272         dev_err(&chip->gpiodev->dev, "(%s): " fmt, chip->label, ##__VA_ARGS__)
 273 #define chip_warn(chip, fmt, ...)                                       \
 274         dev_warn(&chip->gpiodev->dev, "(%s): " fmt, chip->label, ##__VA_ARGS__)
 275 #define chip_info(chip, fmt, ...)                                       \
 276         dev_info(&chip->gpiodev->dev, "(%s): " fmt, chip->label, ##__VA_ARGS__)
 277 #define chip_dbg(chip, fmt, ...)                                        \
 278         dev_dbg(&chip->gpiodev->dev, "(%s): " fmt, chip->label, ##__VA_ARGS__)
 279
 280 #ifdef CONFIG_GPIO_SYSFS
 281
 282 int gpiochip_sysfs_register(struct gpio_device *gdev);
 283 void gpiochip_sysfs_unregister(struct gpio_device *gdev);
 284
 285 #else
 286
 287 static inline int gpiochip_sysfs_register(struct gpio_device *gdev)
 288 {
 289         return 0;
 290 }
 291
 292 static inline void gpiochip_sysfs_unregister(struct gpio_device *gdev)
 293 {
 294 }
 295
 296 #endif /* CONFIG_GPIO_SYSFS */
 297
 298 #endif /* GPIOLIB_H */