ad5592r.c 3.9 KB

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  1. // SPDX-License-Identifier: GPL-2.0-only
  2. /*
  3. * AD5592R Digital <-> Analog converters driver
  4. *
  5. * Copyright 2015-2016 Analog Devices Inc.
  6. * Author: Paul Cercueil <paul.cercueil@analog.com>
  7. */
  8. #include "ad5592r-base.h"
  9. #include <linux/bitops.h>
  10. #include <linux/module.h>
  11. #include <linux/mod_devicetable.h>
  12. #include <linux/spi/spi.h>
  13. #define AD5592R_GPIO_READBACK_EN BIT(10)
  14. #define AD5592R_LDAC_READBACK_EN BIT(6)
  15. static int ad5592r_spi_wnop_r16(struct ad5592r_state *st, __be16 *buf)
  16. {
  17. struct spi_device *spi = container_of(st->dev, struct spi_device, dev);
  18. struct spi_transfer t = {
  19. .tx_buf = &st->spi_msg_nop,
  20. .rx_buf = buf,
  21. .len = 2
  22. };
  23. st->spi_msg_nop = 0; /* NOP */
  24. return spi_sync_transfer(spi, &t, 1);
  25. }
  26. static int ad5592r_write_dac(struct ad5592r_state *st, unsigned chan, u16 value)
  27. {
  28. struct spi_device *spi = container_of(st->dev, struct spi_device, dev);
  29. st->spi_msg = cpu_to_be16(BIT(15) | (chan << 12) | value);
  30. return spi_write(spi, &st->spi_msg, sizeof(st->spi_msg));
  31. }
  32. static int ad5592r_read_adc(struct ad5592r_state *st, unsigned chan, u16 *value)
  33. {
  34. struct spi_device *spi = container_of(st->dev, struct spi_device, dev);
  35. int ret;
  36. st->spi_msg = cpu_to_be16((AD5592R_REG_ADC_SEQ << 11) | BIT(chan));
  37. ret = spi_write(spi, &st->spi_msg, sizeof(st->spi_msg));
  38. if (ret)
  39. return ret;
  40. /*
  41. * Invalid data:
  42. * See Figure 40. Single-Channel ADC Conversion Sequence
  43. */
  44. ret = ad5592r_spi_wnop_r16(st, &st->spi_msg);
  45. if (ret)
  46. return ret;
  47. ret = ad5592r_spi_wnop_r16(st, &st->spi_msg);
  48. if (ret)
  49. return ret;
  50. *value = be16_to_cpu(st->spi_msg);
  51. return 0;
  52. }
  53. static int ad5592r_reg_write(struct ad5592r_state *st, u8 reg, u16 value)
  54. {
  55. struct spi_device *spi = container_of(st->dev, struct spi_device, dev);
  56. st->spi_msg = cpu_to_be16((reg << 11) | value);
  57. return spi_write(spi, &st->spi_msg, sizeof(st->spi_msg));
  58. }
  59. static int ad5592r_reg_read(struct ad5592r_state *st, u8 reg, u16 *value)
  60. {
  61. struct spi_device *spi = container_of(st->dev, struct spi_device, dev);
  62. int ret;
  63. st->spi_msg = cpu_to_be16((AD5592R_REG_LDAC << 11) |
  64. AD5592R_LDAC_READBACK_EN | (reg << 2));
  65. ret = spi_write(spi, &st->spi_msg, sizeof(st->spi_msg));
  66. if (ret)
  67. return ret;
  68. ret = ad5592r_spi_wnop_r16(st, &st->spi_msg);
  69. if (ret)
  70. return ret;
  71. *value = be16_to_cpu(st->spi_msg);
  72. return 0;
  73. }
  74. static int ad5592r_gpio_read(struct ad5592r_state *st, u8 *value)
  75. {
  76. int ret;
  77. ret = ad5592r_reg_write(st, AD5592R_REG_GPIO_IN_EN,
  78. AD5592R_GPIO_READBACK_EN | st->gpio_in);
  79. if (ret)
  80. return ret;
  81. ret = ad5592r_spi_wnop_r16(st, &st->spi_msg);
  82. if (ret)
  83. return ret;
  84. *value = (u8) be16_to_cpu(st->spi_msg);
  85. return 0;
  86. }
  87. static const struct ad5592r_rw_ops ad5592r_rw_ops = {
  88. .write_dac = ad5592r_write_dac,
  89. .read_adc = ad5592r_read_adc,
  90. .reg_write = ad5592r_reg_write,
  91. .reg_read = ad5592r_reg_read,
  92. .gpio_read = ad5592r_gpio_read,
  93. };
  94. static int ad5592r_spi_probe(struct spi_device *spi)
  95. {
  96. const struct spi_device_id *id = spi_get_device_id(spi);
  97. return ad5592r_probe(&spi->dev, id->name, &ad5592r_rw_ops);
  98. }
  99. static int ad5592r_spi_remove(struct spi_device *spi)
  100. {
  101. return ad5592r_remove(&spi->dev);
  102. }
  103. static const struct spi_device_id ad5592r_spi_ids[] = {
  104. { .name = "ad5592r", },
  105. {}
  106. };
  107. MODULE_DEVICE_TABLE(spi, ad5592r_spi_ids);
  108. static const struct of_device_id ad5592r_of_match[] = {
  109. { .compatible = "adi,ad5592r", },
  110. {},
  111. };
  112. MODULE_DEVICE_TABLE(of, ad5592r_of_match);
  113. static const struct acpi_device_id ad5592r_acpi_match[] = {
  114. {"ADS5592", },
  115. { },
  116. };
  117. MODULE_DEVICE_TABLE(acpi, ad5592r_acpi_match);
  118. static struct spi_driver ad5592r_spi_driver = {
  119. .driver = {
  120. .name = "ad5592r",
  121. .of_match_table = ad5592r_of_match,
  122. .acpi_match_table = ad5592r_acpi_match,
  123. },
  124. .probe = ad5592r_spi_probe,
  125. .remove = ad5592r_spi_remove,
  126. .id_table = ad5592r_spi_ids,
  127. };
  128. module_spi_driver(ad5592r_spi_driver);
  129. MODULE_AUTHOR("Paul Cercueil <paul.cercueil@analog.com>");
  130. MODULE_DESCRIPTION("Analog Devices AD5592R multi-channel converters");
  131. MODULE_LICENSE("GPL v2");