mp2629_adc.c 4.9 KB

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  1. // SPDX-License-Identifier: GPL-2.0-or-later
  2. /*
  3. * MP2629 Driver for ADC
  4. *
  5. * Copyright 2020 Monolithic Power Systems, Inc
  6. *
  7. * Author: Saravanan Sekar <sravanhome@gmail.com>
  8. */
  9. #include <linux/iio/driver.h>
  10. #include <linux/iio/iio.h>
  11. #include <linux/iio/machine.h>
  12. #include <linux/mfd/mp2629.h>
  13. #include <linux/module.h>
  14. #include <linux/mutex.h>
  15. #include <linux/platform_device.h>
  16. #include <linux/regmap.h>
  17. #define MP2629_REG_ADC_CTRL 0x03
  18. #define MP2629_REG_BATT_VOLT 0x0e
  19. #define MP2629_REG_SYSTEM_VOLT 0x0f
  20. #define MP2629_REG_INPUT_VOLT 0x11
  21. #define MP2629_REG_BATT_CURRENT 0x12
  22. #define MP2629_REG_INPUT_CURRENT 0x13
  23. #define MP2629_ADC_START BIT(7)
  24. #define MP2629_ADC_CONTINUOUS BIT(6)
  25. #define MP2629_MAP(_mp, _mpc) IIO_MAP(#_mp, "mp2629_charger", "mp2629-"_mpc)
  26. #define MP2629_ADC_CHAN(_ch, _type) { \
  27. .type = _type, \
  28. .indexed = 1, \
  29. .datasheet_name = #_ch, \
  30. .channel = MP2629_ ## _ch, \
  31. .address = MP2629_REG_ ## _ch, \
  32. .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
  33. .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
  34. }
  35. struct mp2629_adc {
  36. struct regmap *regmap;
  37. struct device *dev;
  38. };
  39. static struct iio_chan_spec mp2629_channels[] = {
  40. MP2629_ADC_CHAN(BATT_VOLT, IIO_VOLTAGE),
  41. MP2629_ADC_CHAN(SYSTEM_VOLT, IIO_VOLTAGE),
  42. MP2629_ADC_CHAN(INPUT_VOLT, IIO_VOLTAGE),
  43. MP2629_ADC_CHAN(BATT_CURRENT, IIO_CURRENT),
  44. MP2629_ADC_CHAN(INPUT_CURRENT, IIO_CURRENT)
  45. };
  46. static struct iio_map mp2629_adc_maps[] = {
  47. MP2629_MAP(BATT_VOLT, "batt-volt"),
  48. MP2629_MAP(SYSTEM_VOLT, "system-volt"),
  49. MP2629_MAP(INPUT_VOLT, "input-volt"),
  50. MP2629_MAP(BATT_CURRENT, "batt-current"),
  51. MP2629_MAP(INPUT_CURRENT, "input-current")
  52. };
  53. static int mp2629_read_raw(struct iio_dev *indio_dev,
  54. struct iio_chan_spec const *chan,
  55. int *val, int *val2, long mask)
  56. {
  57. struct mp2629_adc *info = iio_priv(indio_dev);
  58. unsigned int rval;
  59. int ret;
  60. switch (mask) {
  61. case IIO_CHAN_INFO_RAW:
  62. ret = regmap_read(info->regmap, chan->address, &rval);
  63. if (ret)
  64. return ret;
  65. if (chan->address == MP2629_INPUT_VOLT)
  66. rval &= GENMASK(6, 0);
  67. *val = rval;
  68. return IIO_VAL_INT;
  69. case IIO_CHAN_INFO_SCALE:
  70. switch (chan->channel) {
  71. case MP2629_BATT_VOLT:
  72. case MP2629_SYSTEM_VOLT:
  73. *val = 20;
  74. return IIO_VAL_INT;
  75. case MP2629_INPUT_VOLT:
  76. *val = 60;
  77. return IIO_VAL_INT;
  78. case MP2629_BATT_CURRENT:
  79. *val = 175;
  80. *val2 = 10;
  81. return IIO_VAL_FRACTIONAL;
  82. case MP2629_INPUT_CURRENT:
  83. *val = 133;
  84. *val2 = 10;
  85. return IIO_VAL_FRACTIONAL;
  86. default:
  87. return -EINVAL;
  88. }
  89. default:
  90. return -EINVAL;
  91. }
  92. }
  93. static const struct iio_info mp2629_adc_info = {
  94. .read_raw = &mp2629_read_raw,
  95. };
  96. static int mp2629_adc_probe(struct platform_device *pdev)
  97. {
  98. struct device *dev = &pdev->dev;
  99. struct mp2629_data *ddata = dev_get_drvdata(dev->parent);
  100. struct mp2629_adc *info;
  101. struct iio_dev *indio_dev;
  102. int ret;
  103. indio_dev = devm_iio_device_alloc(dev, sizeof(*info));
  104. if (!indio_dev)
  105. return -ENOMEM;
  106. info = iio_priv(indio_dev);
  107. info->regmap = ddata->regmap;
  108. info->dev = dev;
  109. platform_set_drvdata(pdev, indio_dev);
  110. ret = regmap_update_bits(info->regmap, MP2629_REG_ADC_CTRL,
  111. MP2629_ADC_START | MP2629_ADC_CONTINUOUS,
  112. MP2629_ADC_START | MP2629_ADC_CONTINUOUS);
  113. if (ret) {
  114. dev_err(dev, "adc enable fail: %d\n", ret);
  115. return ret;
  116. }
  117. ret = iio_map_array_register(indio_dev, mp2629_adc_maps);
  118. if (ret) {
  119. dev_err(dev, "IIO maps register fail: %d\n", ret);
  120. goto fail_disable;
  121. }
  122. indio_dev->name = "mp2629-adc";
  123. indio_dev->dev.parent = dev;
  124. indio_dev->channels = mp2629_channels;
  125. indio_dev->num_channels = ARRAY_SIZE(mp2629_channels);
  126. indio_dev->modes = INDIO_DIRECT_MODE;
  127. indio_dev->info = &mp2629_adc_info;
  128. ret = iio_device_register(indio_dev);
  129. if (ret) {
  130. dev_err(dev, "IIO device register fail: %d\n", ret);
  131. goto fail_map_unregister;
  132. }
  133. return 0;
  134. fail_map_unregister:
  135. iio_map_array_unregister(indio_dev);
  136. fail_disable:
  137. regmap_update_bits(info->regmap, MP2629_REG_ADC_CTRL,
  138. MP2629_ADC_CONTINUOUS, 0);
  139. regmap_update_bits(info->regmap, MP2629_REG_ADC_CTRL,
  140. MP2629_ADC_START, 0);
  141. return ret;
  142. }
  143. static int mp2629_adc_remove(struct platform_device *pdev)
  144. {
  145. struct iio_dev *indio_dev = platform_get_drvdata(pdev);
  146. struct mp2629_adc *info = iio_priv(indio_dev);
  147. iio_device_unregister(indio_dev);
  148. iio_map_array_unregister(indio_dev);
  149. regmap_update_bits(info->regmap, MP2629_REG_ADC_CTRL,
  150. MP2629_ADC_CONTINUOUS, 0);
  151. regmap_update_bits(info->regmap, MP2629_REG_ADC_CTRL,
  152. MP2629_ADC_START, 0);
  153. return 0;
  154. }
  155. static const struct of_device_id mp2629_adc_of_match[] = {
  156. { .compatible = "mps,mp2629_adc"},
  157. {}
  158. };
  159. MODULE_DEVICE_TABLE(of, mp2629_adc_of_match);
  160. static struct platform_driver mp2629_adc_driver = {
  161. .driver = {
  162. .name = "mp2629_adc",
  163. .of_match_table = mp2629_adc_of_match,
  164. },
  165. .probe = mp2629_adc_probe,
  166. .remove = mp2629_adc_remove,
  167. };
  168. module_platform_driver(mp2629_adc_driver);
  169. MODULE_AUTHOR("Saravanan Sekar <sravanhome@gmail.com>");
  170. MODULE_DESCRIPTION("MP2629 ADC driver");
  171. MODULE_LICENSE("GPL");