i2c.c 1.3 KB

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  1. /*
  2. * SPDX-License-Identifier: BSD-2-Clause
  3. *
  4. * Copyright (c) 2021 YADRO
  5. *
  6. * Authors:
  7. * Nikita Shubin <n.shubin@yadro.com>
  8. *
  9. * derivate: lib/utils/gpio/gpio.c
  10. * Authors:
  11. * Anup Patel <anup.patel@wdc.com>
  12. */
  13. #include <sbi/sbi_error.h>
  14. #include <sbi_utils/i2c/i2c.h>
  15. static SBI_LIST_HEAD(i2c_adapters_list);
  16. struct i2c_adapter *i2c_adapter_find(int id)
  17. {
  18. struct sbi_dlist *pos;
  19. sbi_list_for_each(pos, &(i2c_adapters_list)) {
  20. struct i2c_adapter *adap = to_i2c_adapter(pos);
  21. if (adap->id == id)
  22. return adap;
  23. }
  24. return NULL;
  25. }
  26. int i2c_adapter_add(struct i2c_adapter *ia)
  27. {
  28. if (!ia)
  29. return SBI_EINVAL;
  30. if (i2c_adapter_find(ia->id))
  31. return SBI_EALREADY;
  32. sbi_list_add(&(ia->node), &(i2c_adapters_list));
  33. return 0;
  34. }
  35. void i2c_adapter_remove(struct i2c_adapter *ia)
  36. {
  37. if (!ia)
  38. return;
  39. sbi_list_del(&(ia->node));
  40. }
  41. int i2c_adapter_write(struct i2c_adapter *ia, uint8_t addr, uint8_t reg,
  42. uint8_t *buffer, int len)
  43. {
  44. if (!ia)
  45. return SBI_EINVAL;
  46. if (!ia->write)
  47. return SBI_ENOSYS;
  48. return ia->write(ia, addr, reg, buffer, len);
  49. }
  50. int i2c_adapter_read(struct i2c_adapter *ia, uint8_t addr, uint8_t reg,
  51. uint8_t *buffer, int len)
  52. {
  53. if (!ia)
  54. return SBI_EINVAL;
  55. if (!ia->read)
  56. return SBI_ENOSYS;
  57. return ia->read(ia, addr, reg, buffer, len);
  58. }