gpio-utils.h 2.1 KB

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  1. /* SPDX-License-Identifier: GPL-2.0-only */
  2. /*
  3. * GPIO tools - utility helpers library for the GPIO tools
  4. *
  5. * Copyright (C) 2015 Linus Walleij
  6. *
  7. * Portions copied from iio_utils and lssio:
  8. * Copyright (c) 2010 Manuel Stahl <manuel.stahl@iis.fraunhofer.de>
  9. * Copyright (c) 2008 Jonathan Cameron
  10. * *
  11. */
  12. #ifndef _GPIO_UTILS_H_
  13. #define _GPIO_UTILS_H_
  14. #include <stdbool.h>
  15. #include <string.h>
  16. #include <linux/types.h>
  17. #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
  18. static inline int check_prefix(const char *str, const char *prefix)
  19. {
  20. return strlen(str) > strlen(prefix) &&
  21. strncmp(str, prefix, strlen(prefix)) == 0;
  22. }
  23. int gpiotools_request_linehandle(const char *device_name, unsigned int *lines,
  24. unsigned int num_lines, unsigned int flag,
  25. struct gpiohandle_data *data,
  26. const char *consumer_label);
  27. int gpiotools_release_linehandle(const int fd);
  28. int gpiotools_request_line(const char *device_name,
  29. unsigned int *lines,
  30. unsigned int num_lines,
  31. struct gpio_v2_line_config *config,
  32. const char *consumer);
  33. int gpiotools_set_values(const int fd, struct gpio_v2_line_values *values);
  34. int gpiotools_get_values(const int fd, struct gpio_v2_line_values *values);
  35. int gpiotools_release_line(const int fd);
  36. int gpiotools_get(const char *device_name, unsigned int line);
  37. int gpiotools_gets(const char *device_name, unsigned int *lines,
  38. unsigned int num_lines, unsigned int *values);
  39. int gpiotools_set(const char *device_name, unsigned int line,
  40. unsigned int value);
  41. int gpiotools_sets(const char *device_name, unsigned int *lines,
  42. unsigned int num_lines, unsigned int *values);
  43. /* helper functions for gpio_v2_line_values bits */
  44. static inline void gpiotools_set_bit(__u64 *b, int n)
  45. {
  46. *b |= _BITULL(n);
  47. }
  48. static inline void gpiotools_change_bit(__u64 *b, int n)
  49. {
  50. *b ^= _BITULL(n);
  51. }
  52. static inline void gpiotools_clear_bit(__u64 *b, int n)
  53. {
  54. *b &= ~_BITULL(n);
  55. }
  56. static inline int gpiotools_test_bit(__u64 b, int n)
  57. {
  58. return !!(b & _BITULL(n));
  59. }
  60. static inline void gpiotools_assign_bit(__u64 *b, int n, bool value)
  61. {
  62. if (value)
  63. gpiotools_set_bit(b, n);
  64. else
  65. gpiotools_clear_bit(b, n);
  66. }
  67. #endif /* _GPIO_UTILS_H_ */