max8997_charger.c 4.4 KB

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  1. // SPDX-License-Identifier: GPL-2.0+
  2. //
  3. // max8997_charger.c - Power supply consumer driver for the Maxim 8997/8966
  4. //
  5. // Copyright (C) 2011 Samsung Electronics
  6. // MyungJoo Ham <myungjoo.ham@samsung.com>
  7. #include <linux/err.h>
  8. #include <linux/module.h>
  9. #include <linux/slab.h>
  10. #include <linux/platform_device.h>
  11. #include <linux/power_supply.h>
  12. #include <linux/mfd/max8997.h>
  13. #include <linux/mfd/max8997-private.h>
  14. struct charger_data {
  15. struct device *dev;
  16. struct max8997_dev *iodev;
  17. struct power_supply *battery;
  18. };
  19. static enum power_supply_property max8997_battery_props[] = {
  20. POWER_SUPPLY_PROP_STATUS, /* "FULL" or "NOT FULL" only. */
  21. POWER_SUPPLY_PROP_PRESENT, /* the presence of battery */
  22. POWER_SUPPLY_PROP_ONLINE, /* charger is active or not */
  23. };
  24. /* Note that the charger control is done by a current regulator "CHARGER" */
  25. static int max8997_battery_get_property(struct power_supply *psy,
  26. enum power_supply_property psp,
  27. union power_supply_propval *val)
  28. {
  29. struct charger_data *charger = power_supply_get_drvdata(psy);
  30. struct i2c_client *i2c = charger->iodev->i2c;
  31. int ret;
  32. u8 reg;
  33. switch (psp) {
  34. case POWER_SUPPLY_PROP_STATUS:
  35. val->intval = 0;
  36. ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, &reg);
  37. if (ret)
  38. return ret;
  39. if ((reg & (1 << 0)) == 0x1)
  40. val->intval = POWER_SUPPLY_STATUS_FULL;
  41. break;
  42. case POWER_SUPPLY_PROP_PRESENT:
  43. val->intval = 0;
  44. ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, &reg);
  45. if (ret)
  46. return ret;
  47. if ((reg & (1 << 2)) == 0x0)
  48. val->intval = 1;
  49. break;
  50. case POWER_SUPPLY_PROP_ONLINE:
  51. val->intval = 0;
  52. ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, &reg);
  53. if (ret)
  54. return ret;
  55. /* DCINOK */
  56. if (reg & (1 << 1))
  57. val->intval = 1;
  58. break;
  59. default:
  60. return -EINVAL;
  61. }
  62. return 0;
  63. }
  64. static const struct power_supply_desc max8997_battery_desc = {
  65. .name = "max8997_pmic",
  66. .type = POWER_SUPPLY_TYPE_BATTERY,
  67. .get_property = max8997_battery_get_property,
  68. .properties = max8997_battery_props,
  69. .num_properties = ARRAY_SIZE(max8997_battery_props),
  70. };
  71. static int max8997_battery_probe(struct platform_device *pdev)
  72. {
  73. int ret = 0;
  74. struct charger_data *charger;
  75. struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
  76. struct max8997_platform_data *pdata = dev_get_platdata(iodev->dev);
  77. struct power_supply_config psy_cfg = {};
  78. if (!pdata)
  79. return -EINVAL;
  80. if (pdata->eoc_mA) {
  81. int val = (pdata->eoc_mA - 50) / 10;
  82. if (val < 0)
  83. val = 0;
  84. if (val > 0xf)
  85. val = 0xf;
  86. ret = max8997_update_reg(iodev->i2c,
  87. MAX8997_REG_MBCCTRL5, val, 0xf);
  88. if (ret < 0) {
  89. dev_err(&pdev->dev, "Cannot use i2c bus.\n");
  90. return ret;
  91. }
  92. }
  93. switch (pdata->timeout) {
  94. case 5:
  95. ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
  96. 0x2 << 4, 0x7 << 4);
  97. break;
  98. case 6:
  99. ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
  100. 0x3 << 4, 0x7 << 4);
  101. break;
  102. case 7:
  103. ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
  104. 0x4 << 4, 0x7 << 4);
  105. break;
  106. case 0:
  107. ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
  108. 0x7 << 4, 0x7 << 4);
  109. break;
  110. default:
  111. dev_err(&pdev->dev, "incorrect timeout value (%d)\n",
  112. pdata->timeout);
  113. return -EINVAL;
  114. }
  115. if (ret < 0) {
  116. dev_err(&pdev->dev, "Cannot use i2c bus.\n");
  117. return ret;
  118. }
  119. charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL);
  120. if (!charger)
  121. return -ENOMEM;
  122. platform_set_drvdata(pdev, charger);
  123. charger->dev = &pdev->dev;
  124. charger->iodev = iodev;
  125. psy_cfg.drv_data = charger;
  126. charger->battery = devm_power_supply_register(&pdev->dev,
  127. &max8997_battery_desc,
  128. &psy_cfg);
  129. if (IS_ERR(charger->battery)) {
  130. dev_err(&pdev->dev, "failed: power supply register\n");
  131. return PTR_ERR(charger->battery);
  132. }
  133. return 0;
  134. }
  135. static const struct platform_device_id max8997_battery_id[] = {
  136. { "max8997-battery", 0 },
  137. { }
  138. };
  139. MODULE_DEVICE_TABLE(platform, max8997_battery_id);
  140. static struct platform_driver max8997_battery_driver = {
  141. .driver = {
  142. .name = "max8997-battery",
  143. },
  144. .probe = max8997_battery_probe,
  145. .id_table = max8997_battery_id,
  146. };
  147. static int __init max8997_battery_init(void)
  148. {
  149. return platform_driver_register(&max8997_battery_driver);
  150. }
  151. subsys_initcall(max8997_battery_init);
  152. static void __exit max8997_battery_cleanup(void)
  153. {
  154. platform_driver_unregister(&max8997_battery_driver);
  155. }
  156. module_exit(max8997_battery_cleanup);
  157. MODULE_DESCRIPTION("MAXIM 8997/8966 battery control driver");
  158. MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
  159. MODULE_LICENSE("GPL");