adt7310.c 2.8 KB

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  1. // SPDX-License-Identifier: GPL-2.0-or-later
  2. /*
  3. * ADT7310/ADT7310 digital temperature sensor driver
  4. *
  5. * Copyright 2012-2013 Analog Devices Inc.
  6. * Author: Lars-Peter Clausen <lars@metafoo.de>
  7. */
  8. #include <linux/module.h>
  9. #include <linux/init.h>
  10. #include <linux/spi/spi.h>
  11. #include <asm/unaligned.h>
  12. #include "adt7x10.h"
  13. #define ADT7310_STATUS 0
  14. #define ADT7310_CONFIG 1
  15. #define ADT7310_TEMPERATURE 2
  16. #define ADT7310_ID 3
  17. #define ADT7310_T_CRIT 4
  18. #define ADT7310_T_HYST 5
  19. #define ADT7310_T_ALARM_HIGH 6
  20. #define ADT7310_T_ALARM_LOW 7
  21. static const u8 adt7310_reg_table[] = {
  22. [ADT7X10_TEMPERATURE] = ADT7310_TEMPERATURE,
  23. [ADT7X10_STATUS] = ADT7310_STATUS,
  24. [ADT7X10_CONFIG] = ADT7310_CONFIG,
  25. [ADT7X10_T_ALARM_HIGH] = ADT7310_T_ALARM_HIGH,
  26. [ADT7X10_T_ALARM_LOW] = ADT7310_T_ALARM_LOW,
  27. [ADT7X10_T_CRIT] = ADT7310_T_CRIT,
  28. [ADT7X10_T_HYST] = ADT7310_T_HYST,
  29. [ADT7X10_ID] = ADT7310_ID,
  30. };
  31. #define ADT7310_CMD_REG_OFFSET 3
  32. #define ADT7310_CMD_READ 0x40
  33. #define AD7310_COMMAND(reg) (adt7310_reg_table[(reg)] << ADT7310_CMD_REG_OFFSET)
  34. static int adt7310_spi_read_word(struct device *dev, u8 reg)
  35. {
  36. struct spi_device *spi = to_spi_device(dev);
  37. return spi_w8r16be(spi, AD7310_COMMAND(reg) | ADT7310_CMD_READ);
  38. }
  39. static int adt7310_spi_write_word(struct device *dev, u8 reg, u16 data)
  40. {
  41. struct spi_device *spi = to_spi_device(dev);
  42. u8 buf[3];
  43. buf[0] = AD7310_COMMAND(reg);
  44. put_unaligned_be16(data, &buf[1]);
  45. return spi_write(spi, buf, sizeof(buf));
  46. }
  47. static int adt7310_spi_read_byte(struct device *dev, u8 reg)
  48. {
  49. struct spi_device *spi = to_spi_device(dev);
  50. return spi_w8r8(spi, AD7310_COMMAND(reg) | ADT7310_CMD_READ);
  51. }
  52. static int adt7310_spi_write_byte(struct device *dev, u8 reg,
  53. u8 data)
  54. {
  55. struct spi_device *spi = to_spi_device(dev);
  56. u8 buf[2];
  57. buf[0] = AD7310_COMMAND(reg);
  58. buf[1] = data;
  59. return spi_write(spi, buf, sizeof(buf));
  60. }
  61. static const struct adt7x10_ops adt7310_spi_ops = {
  62. .read_word = adt7310_spi_read_word,
  63. .write_word = adt7310_spi_write_word,
  64. .read_byte = adt7310_spi_read_byte,
  65. .write_byte = adt7310_spi_write_byte,
  66. };
  67. static int adt7310_spi_probe(struct spi_device *spi)
  68. {
  69. return adt7x10_probe(&spi->dev, spi_get_device_id(spi)->name, spi->irq,
  70. &adt7310_spi_ops);
  71. }
  72. static int adt7310_spi_remove(struct spi_device *spi)
  73. {
  74. return adt7x10_remove(&spi->dev, spi->irq);
  75. }
  76. static const struct spi_device_id adt7310_id[] = {
  77. { "adt7310", 0 },
  78. { "adt7320", 0 },
  79. {}
  80. };
  81. MODULE_DEVICE_TABLE(spi, adt7310_id);
  82. static struct spi_driver adt7310_driver = {
  83. .driver = {
  84. .name = "adt7310",
  85. .pm = ADT7X10_DEV_PM_OPS,
  86. },
  87. .probe = adt7310_spi_probe,
  88. .remove = adt7310_spi_remove,
  89. .id_table = adt7310_id,
  90. };
  91. module_spi_driver(adt7310_driver);
  92. MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
  93. MODULE_DESCRIPTION("ADT7310/ADT7320 driver");
  94. MODULE_LICENSE("GPL");