ir35221.c 3.7 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148
  1. // SPDX-License-Identifier: GPL-2.0-or-later
  2. /*
  3. * Hardware monitoring driver for IR35221
  4. *
  5. * Copyright (C) IBM Corporation 2017.
  6. */
  7. #include <linux/err.h>
  8. #include <linux/i2c.h>
  9. #include <linux/init.h>
  10. #include <linux/kernel.h>
  11. #include <linux/module.h>
  12. #include "pmbus.h"
  13. #define IR35221_MFR_VIN_PEAK 0xc5
  14. #define IR35221_MFR_VOUT_PEAK 0xc6
  15. #define IR35221_MFR_IOUT_PEAK 0xc7
  16. #define IR35221_MFR_TEMP_PEAK 0xc8
  17. #define IR35221_MFR_VIN_VALLEY 0xc9
  18. #define IR35221_MFR_VOUT_VALLEY 0xca
  19. #define IR35221_MFR_IOUT_VALLEY 0xcb
  20. #define IR35221_MFR_TEMP_VALLEY 0xcc
  21. static int ir35221_read_word_data(struct i2c_client *client, int page,
  22. int phase, int reg)
  23. {
  24. int ret;
  25. switch (reg) {
  26. case PMBUS_VIRT_READ_VIN_MAX:
  27. ret = pmbus_read_word_data(client, page, phase,
  28. IR35221_MFR_VIN_PEAK);
  29. break;
  30. case PMBUS_VIRT_READ_VOUT_MAX:
  31. ret = pmbus_read_word_data(client, page, phase,
  32. IR35221_MFR_VOUT_PEAK);
  33. break;
  34. case PMBUS_VIRT_READ_IOUT_MAX:
  35. ret = pmbus_read_word_data(client, page, phase,
  36. IR35221_MFR_IOUT_PEAK);
  37. break;
  38. case PMBUS_VIRT_READ_TEMP_MAX:
  39. ret = pmbus_read_word_data(client, page, phase,
  40. IR35221_MFR_TEMP_PEAK);
  41. break;
  42. case PMBUS_VIRT_READ_VIN_MIN:
  43. ret = pmbus_read_word_data(client, page, phase,
  44. IR35221_MFR_VIN_VALLEY);
  45. break;
  46. case PMBUS_VIRT_READ_VOUT_MIN:
  47. ret = pmbus_read_word_data(client, page, phase,
  48. IR35221_MFR_VOUT_VALLEY);
  49. break;
  50. case PMBUS_VIRT_READ_IOUT_MIN:
  51. ret = pmbus_read_word_data(client, page, phase,
  52. IR35221_MFR_IOUT_VALLEY);
  53. break;
  54. case PMBUS_VIRT_READ_TEMP_MIN:
  55. ret = pmbus_read_word_data(client, page, phase,
  56. IR35221_MFR_TEMP_VALLEY);
  57. break;
  58. default:
  59. ret = -ENODATA;
  60. break;
  61. }
  62. return ret;
  63. }
  64. static int ir35221_probe(struct i2c_client *client)
  65. {
  66. struct pmbus_driver_info *info;
  67. u8 buf[I2C_SMBUS_BLOCK_MAX];
  68. int ret;
  69. if (!i2c_check_functionality(client->adapter,
  70. I2C_FUNC_SMBUS_READ_BYTE_DATA
  71. | I2C_FUNC_SMBUS_READ_WORD_DATA
  72. | I2C_FUNC_SMBUS_READ_BLOCK_DATA))
  73. return -ENODEV;
  74. ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf);
  75. if (ret < 0) {
  76. dev_err(&client->dev, "Failed to read PMBUS_MFR_ID\n");
  77. return ret;
  78. }
  79. if (ret != 2 || strncmp(buf, "RI", strlen("RI"))) {
  80. dev_err(&client->dev, "MFR_ID unrecognised\n");
  81. return -ENODEV;
  82. }
  83. ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf);
  84. if (ret < 0) {
  85. dev_err(&client->dev, "Failed to read PMBUS_MFR_MODEL\n");
  86. return ret;
  87. }
  88. if (ret != 2 || !(buf[0] == 0x6c && buf[1] == 0x00)) {
  89. dev_err(&client->dev, "MFR_MODEL unrecognised\n");
  90. return -ENODEV;
  91. }
  92. info = devm_kzalloc(&client->dev, sizeof(struct pmbus_driver_info),
  93. GFP_KERNEL);
  94. if (!info)
  95. return -ENOMEM;
  96. info->read_word_data = ir35221_read_word_data;
  97. info->pages = 2;
  98. info->format[PSC_VOLTAGE_IN] = linear;
  99. info->format[PSC_VOLTAGE_OUT] = linear;
  100. info->format[PSC_CURRENT_IN] = linear;
  101. info->format[PSC_CURRENT_OUT] = linear;
  102. info->format[PSC_POWER] = linear;
  103. info->format[PSC_TEMPERATURE] = linear;
  104. info->func[0] = PMBUS_HAVE_VIN
  105. | PMBUS_HAVE_VOUT | PMBUS_HAVE_IIN
  106. | PMBUS_HAVE_IOUT | PMBUS_HAVE_PIN
  107. | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP
  108. | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT
  109. | PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP;
  110. info->func[1] = info->func[0];
  111. return pmbus_do_probe(client, info);
  112. }
  113. static const struct i2c_device_id ir35221_id[] = {
  114. {"ir35221", 0},
  115. {}
  116. };
  117. MODULE_DEVICE_TABLE(i2c, ir35221_id);
  118. static struct i2c_driver ir35221_driver = {
  119. .driver = {
  120. .name = "ir35221",
  121. },
  122. .probe_new = ir35221_probe,
  123. .id_table = ir35221_id,
  124. };
  125. module_i2c_driver(ir35221_driver);
  126. MODULE_AUTHOR("Samuel Mendoza-Jonas <[email protected]");
  127. MODULE_DESCRIPTION("PMBus driver for IR35221");
  128. MODULE_LICENSE("GPL");
  129. MODULE_IMPORT_NS(PMBUS);