qcom_usb_vbus-regulator.c 2.5 KB

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  1. // SPDX-License-Identifier: GPL-2.0-only
  2. //
  3. // Qualcomm PMIC VBUS output regulator driver
  4. //
  5. // Copyright (c) 2020, The Linux Foundation. All rights reserved.
  6. #include <linux/module.h>
  7. #include <linux/err.h>
  8. #include <linux/kernel.h>
  9. #include <linux/of.h>
  10. #include <linux/of_device.h>
  11. #include <linux/platform_device.h>
  12. #include <linux/regulator/driver.h>
  13. #include <linux/regulator/of_regulator.h>
  14. #include <linux/regmap.h>
  15. #define CMD_OTG 0x40
  16. #define OTG_EN BIT(0)
  17. #define OTG_CFG 0x53
  18. #define OTG_EN_SRC_CFG BIT(1)
  19. static const struct regulator_ops qcom_usb_vbus_reg_ops = {
  20. .enable = regulator_enable_regmap,
  21. .disable = regulator_disable_regmap,
  22. .is_enabled = regulator_is_enabled_regmap,
  23. };
  24. static struct regulator_desc qcom_usb_vbus_rdesc = {
  25. .name = "usb_vbus",
  26. .ops = &qcom_usb_vbus_reg_ops,
  27. .owner = THIS_MODULE,
  28. .type = REGULATOR_VOLTAGE,
  29. };
  30. static int qcom_usb_vbus_regulator_probe(struct platform_device *pdev)
  31. {
  32. struct device *dev = &pdev->dev;
  33. struct regulator_dev *rdev;
  34. struct regmap *regmap;
  35. struct regulator_config config = { };
  36. struct regulator_init_data *init_data;
  37. int ret;
  38. u32 base;
  39. ret = of_property_read_u32(dev->of_node, "reg", &base);
  40. if (ret < 0) {
  41. dev_err(dev, "no base address found\n");
  42. return ret;
  43. }
  44. regmap = dev_get_regmap(dev->parent, NULL);
  45. if (!regmap) {
  46. dev_err(dev, "Failed to get regmap\n");
  47. return -ENOENT;
  48. }
  49. init_data = of_get_regulator_init_data(dev, dev->of_node,
  50. &qcom_usb_vbus_rdesc);
  51. if (!init_data)
  52. return -ENOMEM;
  53. qcom_usb_vbus_rdesc.enable_reg = base + CMD_OTG;
  54. qcom_usb_vbus_rdesc.enable_mask = OTG_EN;
  55. config.dev = dev;
  56. config.init_data = init_data;
  57. config.of_node = dev->of_node;
  58. config.regmap = regmap;
  59. rdev = devm_regulator_register(dev, &qcom_usb_vbus_rdesc, &config);
  60. if (IS_ERR(rdev)) {
  61. ret = PTR_ERR(rdev);
  62. dev_err(dev, "not able to register vbus reg %d\n", ret);
  63. return ret;
  64. }
  65. /* Disable HW logic for VBUS enable */
  66. regmap_update_bits(regmap, base + OTG_CFG, OTG_EN_SRC_CFG, 0);
  67. return 0;
  68. }
  69. static const struct of_device_id qcom_usb_vbus_regulator_match[] = {
  70. { .compatible = "qcom,pm8150b-vbus-reg" },
  71. { }
  72. };
  73. MODULE_DEVICE_TABLE(of, qcom_usb_vbus_regulator_match);
  74. static struct platform_driver qcom_usb_vbus_regulator_driver = {
  75. .driver = {
  76. .name = "qcom-usb-vbus-regulator",
  77. .of_match_table = qcom_usb_vbus_regulator_match,
  78. },
  79. .probe = qcom_usb_vbus_regulator_probe,
  80. };
  81. module_platform_driver(qcom_usb_vbus_regulator_driver);
  82. MODULE_DESCRIPTION("Qualcomm USB vbus regulator driver");
  83. MODULE_LICENSE("GPL v2");