drivers/regulator/qcom_usb_vbus-regulator.c

   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
   7 #include <linux/module.h>
   8 #include <linux/err.h>
   9 #include <linux/kernel.h>
  10 #include <linux/of.h>
  11 #include <linux/of_device.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/regulator/driver.h>
  14 #include <linux/regulator/of_regulator.h>
  15 #include <linux/regmap.h>
  16
  17 #define CMD_OTG                         0x40
  18 #define OTG_EN                          BIT(0)
  19 #define OTG_CFG                         0x53
  20 #define OTG_EN_SRC_CFG                  BIT(1)
  21
  22 static const struct regulator_ops qcom_usb_vbus_reg_ops = {
  23         .enable = regulator_enable_regmap,
  24         .disable = regulator_disable_regmap,
  25         .is_enabled = regulator_is_enabled_regmap,
  26 };
  27
  28 static struct regulator_desc qcom_usb_vbus_rdesc = {
  29         .name = "usb_vbus",
  30         .ops = &qcom_usb_vbus_reg_ops,
  31         .owner = THIS_MODULE,
  32         .type = REGULATOR_VOLTAGE,
  33 };
  34
  35 static int qcom_usb_vbus_regulator_probe(struct platform_device *pdev)
  36 {
  37         struct device *dev = &pdev->dev;
  38         struct regulator_dev *rdev;
  39         struct regmap *regmap;
  40         struct regulator_config config = { };
  41         struct regulator_init_data *init_data;
  42         int ret;
  43         u32 base;
  44
  45         ret = of_property_read_u32(dev->of_node, "reg", &base);
  46         if (ret < 0) {
  47                 dev_err(dev, "no base address found\n");
  48                 return ret;
  49         }
  50
  51         regmap = dev_get_regmap(dev->parent, NULL);
  52         if (!regmap) {
  53                 dev_err(dev, "Failed to get regmap\n");
  54                 return -ENOENT;
  55         }
  56
  57         init_data = of_get_regulator_init_data(dev, dev->of_node,
  58                                                &qcom_usb_vbus_rdesc);
  59         if (!init_data)
  60                 return -ENOMEM;
  61
  62         qcom_usb_vbus_rdesc.enable_reg = base + CMD_OTG;
  63         qcom_usb_vbus_rdesc.enable_mask = OTG_EN;
  64         config.dev = dev;
  65         config.init_data = init_data;
  66         config.of_node = dev->of_node;
  67         config.regmap = regmap;
  68
  69         rdev = devm_regulator_register(dev, &qcom_usb_vbus_rdesc, &config);
  70         if (IS_ERR(rdev)) {
  71                 ret = PTR_ERR(rdev);
  72                 dev_err(dev, "not able to register vbus reg %d\n", ret);
  73                 return ret;
  74         }
  75
  76         /* Disable HW logic for VBUS enable */
  77         regmap_update_bits(regmap, base + OTG_CFG, OTG_EN_SRC_CFG, 0);
  78
  79         return 0;
  80 }
  81
  82 static const struct of_device_id qcom_usb_vbus_regulator_match[] = {
  83         { .compatible = "qcom,pm8150b-vbus-reg" },
  84         { }
  85 };
  86 MODULE_DEVICE_TABLE(of, qcom_usb_vbus_regulator_match);
  87
  88 static struct platform_driver qcom_usb_vbus_regulator_driver = {
  89         .driver         = {
  90                 .name   = "qcom-usb-vbus-regulator",
  91                 .of_match_table = qcom_usb_vbus_regulator_match,
  92         },
  93         .probe          = qcom_usb_vbus_regulator_probe,
  94 };
  95 module_platform_driver(qcom_usb_vbus_regulator_driver);
  96
  97 MODULE_DESCRIPTION("Qualcomm USB vbus regulator driver");
  98 MODULE_LICENSE("GPL v2");