adt7410.c 2.4 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111
  1. // SPDX-License-Identifier: GPL-2.0-or-later
  2. /*
  3. * ADT7410/ADT7420 digital temperature sensor driver
  4. *
  5. * Copyright 2012-2013 Analog Devices Inc.
  6. * Author: Lars-Peter Clausen <[email protected]>
  7. */
  8. #include <linux/module.h>
  9. #include <linux/init.h>
  10. #include <linux/i2c.h>
  11. #include <linux/regmap.h>
  12. #include "adt7x10.h"
  13. static bool adt7410_regmap_is_volatile(struct device *dev, unsigned int reg)
  14. {
  15. switch (reg) {
  16. case ADT7X10_TEMPERATURE:
  17. case ADT7X10_STATUS:
  18. return true;
  19. default:
  20. return false;
  21. }
  22. }
  23. static int adt7410_reg_read(void *context, unsigned int reg, unsigned int *val)
  24. {
  25. struct i2c_client *client = context;
  26. int regval;
  27. switch (reg) {
  28. case ADT7X10_TEMPERATURE:
  29. case ADT7X10_T_ALARM_HIGH:
  30. case ADT7X10_T_ALARM_LOW:
  31. case ADT7X10_T_CRIT:
  32. regval = i2c_smbus_read_word_swapped(client, reg);
  33. break;
  34. default:
  35. regval = i2c_smbus_read_byte_data(client, reg);
  36. break;
  37. }
  38. if (regval < 0)
  39. return regval;
  40. *val = regval;
  41. return 0;
  42. }
  43. static int adt7410_reg_write(void *context, unsigned int reg, unsigned int val)
  44. {
  45. struct i2c_client *client = context;
  46. int ret;
  47. switch (reg) {
  48. case ADT7X10_TEMPERATURE:
  49. case ADT7X10_T_ALARM_HIGH:
  50. case ADT7X10_T_ALARM_LOW:
  51. case ADT7X10_T_CRIT:
  52. ret = i2c_smbus_write_word_swapped(client, reg, val);
  53. break;
  54. default:
  55. ret = i2c_smbus_write_byte_data(client, reg, val);
  56. break;
  57. }
  58. return ret;
  59. }
  60. static const struct regmap_config adt7410_regmap_config = {
  61. .reg_bits = 8,
  62. .val_bits = 16,
  63. .max_register = ADT7X10_ID,
  64. .cache_type = REGCACHE_RBTREE,
  65. .volatile_reg = adt7410_regmap_is_volatile,
  66. .reg_read = adt7410_reg_read,
  67. .reg_write = adt7410_reg_write,
  68. };
  69. static int adt7410_i2c_probe(struct i2c_client *client)
  70. {
  71. struct regmap *regmap;
  72. regmap = devm_regmap_init(&client->dev, NULL, client,
  73. &adt7410_regmap_config);
  74. if (IS_ERR(regmap))
  75. return PTR_ERR(regmap);
  76. return adt7x10_probe(&client->dev, client->name, client->irq, regmap);
  77. }
  78. static const struct i2c_device_id adt7410_ids[] = {
  79. { "adt7410", 0 },
  80. { "adt7420", 0 },
  81. {}
  82. };
  83. MODULE_DEVICE_TABLE(i2c, adt7410_ids);
  84. static struct i2c_driver adt7410_driver = {
  85. .class = I2C_CLASS_HWMON,
  86. .driver = {
  87. .name = "adt7410",
  88. .pm = pm_sleep_ptr(&adt7x10_dev_pm_ops),
  89. },
  90. .probe_new = adt7410_i2c_probe,
  91. .id_table = adt7410_ids,
  92. .address_list = I2C_ADDRS(0x48, 0x49, 0x4a, 0x4b),
  93. };
  94. module_i2c_driver(adt7410_driver);
  95. MODULE_AUTHOR("Lars-Peter Clausen <[email protected]>");
  96. MODULE_DESCRIPTION("ADT7410/AD7420 driver");
  97. MODULE_LICENSE("GPL");