ad525x_dpot-spi.c 2.8 KB

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  1. // SPDX-License-Identifier: GPL-2.0-or-later
  2. /*
  3. * Driver for the Analog Devices digital potentiometers (SPI bus)
  4. *
  5. * Copyright (C) 2010-2011 Michael Hennerich, Analog Devices Inc.
  6. */
  7. #include <linux/spi/spi.h>
  8. #include <linux/module.h>
  9. #include "ad525x_dpot.h"
  10. /* SPI bus functions */
  11. static int write8(void *client, u8 val)
  12. {
  13. u8 data = val;
  14. return spi_write(client, &data, 1);
  15. }
  16. static int write16(void *client, u8 reg, u8 val)
  17. {
  18. u8 data[2] = {reg, val};
  19. return spi_write(client, data, 2);
  20. }
  21. static int write24(void *client, u8 reg, u16 val)
  22. {
  23. u8 data[3] = {reg, val >> 8, val};
  24. return spi_write(client, data, 3);
  25. }
  26. static int read8(void *client)
  27. {
  28. int ret;
  29. u8 data;
  30. ret = spi_read(client, &data, 1);
  31. if (ret < 0)
  32. return ret;
  33. return data;
  34. }
  35. static int read16(void *client, u8 reg)
  36. {
  37. int ret;
  38. u8 buf_rx[2];
  39. write16(client, reg, 0);
  40. ret = spi_read(client, buf_rx, 2);
  41. if (ret < 0)
  42. return ret;
  43. return (buf_rx[0] << 8) | buf_rx[1];
  44. }
  45. static int read24(void *client, u8 reg)
  46. {
  47. int ret;
  48. u8 buf_rx[3];
  49. write24(client, reg, 0);
  50. ret = spi_read(client, buf_rx, 3);
  51. if (ret < 0)
  52. return ret;
  53. return (buf_rx[1] << 8) | buf_rx[2];
  54. }
  55. static const struct ad_dpot_bus_ops bops = {
  56. .read_d8 = read8,
  57. .read_r8d8 = read16,
  58. .read_r8d16 = read24,
  59. .write_d8 = write8,
  60. .write_r8d8 = write16,
  61. .write_r8d16 = write24,
  62. };
  63. static int ad_dpot_spi_probe(struct spi_device *spi)
  64. {
  65. struct ad_dpot_bus_data bdata = {
  66. .client = spi,
  67. .bops = &bops,
  68. };
  69. return ad_dpot_probe(&spi->dev, &bdata,
  70. spi_get_device_id(spi)->driver_data,
  71. spi_get_device_id(spi)->name);
  72. }
  73. static int ad_dpot_spi_remove(struct spi_device *spi)
  74. {
  75. return ad_dpot_remove(&spi->dev);
  76. }
  77. static const struct spi_device_id ad_dpot_spi_id[] = {
  78. {"ad5160", AD5160_ID},
  79. {"ad5161", AD5161_ID},
  80. {"ad5162", AD5162_ID},
  81. {"ad5165", AD5165_ID},
  82. {"ad5200", AD5200_ID},
  83. {"ad5201", AD5201_ID},
  84. {"ad5203", AD5203_ID},
  85. {"ad5204", AD5204_ID},
  86. {"ad5206", AD5206_ID},
  87. {"ad5207", AD5207_ID},
  88. {"ad5231", AD5231_ID},
  89. {"ad5232", AD5232_ID},
  90. {"ad5233", AD5233_ID},
  91. {"ad5235", AD5235_ID},
  92. {"ad5260", AD5260_ID},
  93. {"ad5262", AD5262_ID},
  94. {"ad5263", AD5263_ID},
  95. {"ad5290", AD5290_ID},
  96. {"ad5291", AD5291_ID},
  97. {"ad5292", AD5292_ID},
  98. {"ad5293", AD5293_ID},
  99. {"ad7376", AD7376_ID},
  100. {"ad8400", AD8400_ID},
  101. {"ad8402", AD8402_ID},
  102. {"ad8403", AD8403_ID},
  103. {"adn2850", ADN2850_ID},
  104. {"ad5270", AD5270_ID},
  105. {"ad5271", AD5271_ID},
  106. {}
  107. };
  108. MODULE_DEVICE_TABLE(spi, ad_dpot_spi_id);
  109. static struct spi_driver ad_dpot_spi_driver = {
  110. .driver = {
  111. .name = "ad_dpot",
  112. },
  113. .probe = ad_dpot_spi_probe,
  114. .remove = ad_dpot_spi_remove,
  115. .id_table = ad_dpot_spi_id,
  116. };
  117. module_spi_driver(ad_dpot_spi_driver);
  118. MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
  119. MODULE_DESCRIPTION("digital potentiometer SPI bus driver");
  120. MODULE_LICENSE("GPL");
  121. MODULE_ALIAS("spi:ad_dpot");