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gpiolib-acpi.h

gpiolib-acpi.h 3.0 KB
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  1. /* SPDX-License-Identifier: GPL-2.0 */
    2. 

  2. /*
    3. 

  3.  * ACPI helpers for GPIO API
    4. 

  4.  *
    5. 

  5.  * Copyright (C) 2012,2019 Intel Corporation
    6. 

  6.  */
    7. 

  7. 

  8. #ifndef GPIOLIB_ACPI_H
    9. 

  9. #define GPIOLIB_ACPI_H
    10. 

  10. 

  11. struct acpi_device;
    12. 

  12. 

  13. /**
    14. 

  14.  * struct acpi_gpio_info - ACPI GPIO specific information
    15. 

  15.  * @adev: reference to ACPI device which consumes GPIO resource
    16. 

  16.  * @flags: GPIO initialization flags
    17. 

  17.  * @gpioint: if %true this GPIO is of type GpioInt otherwise type is GpioIo
    18. 

  18.  * @pin_config: pin bias as provided by ACPI
    19. 

  19.  * @polarity: interrupt polarity as provided by ACPI
    20. 

  20.  * @triggering: triggering type as provided by ACPI
    21. 

  21.  * @wake_capable: wake capability as provided by ACPI
    22. 

  22.  * @debounce: debounce timeout as provided by ACPI
    23. 

  23.  * @quirks: Linux specific quirks as provided by struct acpi_gpio_mapping
    24. 

  24.  */
    25. 

  25. struct acpi_gpio_info {
    26. 

  26. 	struct acpi_device *adev;
    27. 

  27. 	enum gpiod_flags flags;
    28. 

  28. 	bool gpioint;
    29. 

  29. 	int pin_config;
    30. 

  30. 	int polarity;
    31. 

  31. 	int triggering;
    32. 

  32. 	bool wake_capable;
    33. 

  33. 	unsigned int debounce;
    34. 

  34. 	unsigned int quirks;
    35. 

  35. };
    36. 

  36. 

  37. #ifdef CONFIG_ACPI
    38. 

  38. void acpi_gpiochip_add(struct gpio_chip *chip);
    39. 

  39. void acpi_gpiochip_remove(struct gpio_chip *chip);
    40. 

  40. 

  41. void acpi_gpio_dev_init(struct gpio_chip *gc, struct gpio_device *gdev);
    42. 

  42. 

  43. void acpi_gpiochip_request_interrupts(struct gpio_chip *chip);
    44. 

  44. void acpi_gpiochip_free_interrupts(struct gpio_chip *chip);
    45. 

  45. 

  46. int acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags,
    47. 

  47. 				 struct acpi_gpio_info *info);
    48. 

  48. int acpi_gpio_update_gpiod_lookup_flags(unsigned long *lookupflags,
    49. 

  49. 					struct acpi_gpio_info *info);
    50. 

  50. 

  51. struct gpio_desc *acpi_find_gpio(struct device *dev,
    52. 

  52. 				 const char *con_id,
    53. 

  53. 				 unsigned int idx,
    54. 

  54. 				 enum gpiod_flags *dflags,
    55. 

  55. 				 unsigned long *lookupflags);
    56. 

  56. struct gpio_desc *acpi_node_get_gpiod(struct fwnode_handle *fwnode,
    57. 

  57. 				      const char *propname, int index,
    58. 

  58. 				      struct acpi_gpio_info *info);
    59. 

  59. 

  60. int acpi_gpio_count(struct device *dev, const char *con_id);
    61. 

  61. #else
    62. 

  62. static inline void acpi_gpiochip_add(struct gpio_chip *chip) { }
    63. 

  63. static inline void acpi_gpiochip_remove(struct gpio_chip *chip) { }
    64. 

  64. 

  65. static inline void acpi_gpio_dev_init(struct gpio_chip *gc, struct gpio_device *gdev) { }
    66. 

  66. 

  67. static inline void
    68. 

  68. acpi_gpiochip_request_interrupts(struct gpio_chip *chip) { }
    69. 

  69. 

  70. static inline void
    71. 

  71. acpi_gpiochip_free_interrupts(struct gpio_chip *chip) { }
    72. 

  72. 

  73. static inline int
    74. 

  74. acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, struct acpi_gpio_info *info)
    75. 

  75. {
    76. 

  76. 	return 0;
    77. 

  77. }
    78. 

  78. static inline int
    79. 

  79. acpi_gpio_update_gpiod_lookup_flags(unsigned long *lookupflags,
    80. 

  80. 				    struct acpi_gpio_info *info)
    81. 

  81. {
    82. 

  82. 	return 0;
    83. 

  83. }
    84. 

  84. 

  85. static inline struct gpio_desc *
    86. 

  86. acpi_find_gpio(struct device *dev, const char *con_id,
    87. 

  87. 	       unsigned int idx, enum gpiod_flags *dflags,
    88. 

  88. 	       unsigned long *lookupflags)
    89. 

  89. {
    90. 

  90. 	return ERR_PTR(-ENOENT);
    91. 

  91. }
    92. 

  92. static inline struct gpio_desc *
    93. 

  93. acpi_node_get_gpiod(struct fwnode_handle *fwnode, const char *propname,
    94. 

  94. 		    int index, struct acpi_gpio_info *info)
    95. 

  95. {
    96. 

  96. 	return ERR_PTR(-ENXIO);
    97. 

  97. }
    98. 

  98. static inline int acpi_gpio_count(struct device *dev, const char *con_id)
    99. 

  99. {
    100. 

  100. 	return -ENODEV;
    101. 

  101. }
    102. 

  102. #endif
    103. 

  103. 

  104. #endif /* GPIOLIB_ACPI_H */
    105.