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/platform_device.h>
  12 #include <linux/regulator/driver.h>
  13 #include <linux/regulator/of_regulator.h>
  14 #include <linux/regmap.h>
  15
  16 #define CMD_OTG                         0x40
  17 #define OTG_EN                          BIT(0)
  18 #define OTG_CURRENT_LIMIT_CFG           0x52
  19 #define OTG_CURRENT_LIMIT_MASK          GENMASK(2, 0)
  20 #define OTG_CFG                         0x53
  21 #define OTG_EN_SRC_CFG                  BIT(1)
  22
  23 static const unsigned int curr_table[] = {
  24         500000, 1000000, 1500000, 2000000, 2500000, 3000000,
  25 };
  26
  27 static const struct regulator_ops qcom_usb_vbus_reg_ops = {
  28         .enable = regulator_enable_regmap,
  29         .disable = regulator_disable_regmap,
  30         .is_enabled = regulator_is_enabled_regmap,
  31         .get_current_limit = regulator_get_current_limit_regmap,
  32         .set_current_limit = regulator_set_current_limit_regmap,
  33 };
  34
  35 static struct regulator_desc qcom_usb_vbus_rdesc = {
  36         .name = "usb_vbus",
  37         .ops = &qcom_usb_vbus_reg_ops,
  38         .owner = THIS_MODULE,
  39         .type = REGULATOR_VOLTAGE,
  40         .curr_table = curr_table,
  41         .n_current_limits = ARRAY_SIZE(curr_table),
  42 };
  43
  44 static int qcom_usb_vbus_regulator_probe(struct platform_device *pdev)
  45 {
  46         struct device *dev = &pdev->dev;
  47         struct regulator_dev *rdev;
  48         struct regmap *regmap;
  49         struct regulator_config config = { };
  50         struct regulator_init_data *init_data;
  51         int ret;
  52         u32 base;
  53
  54         ret = of_property_read_u32(dev->of_node, "reg", &base);
  55         if (ret < 0) {
  56                 dev_err(dev, "no base address found\n");
  57                 return ret;
  58         }
  59
  60         regmap = dev_get_regmap(dev->parent, NULL);
  61         if (!regmap) {
  62                 dev_err(dev, "Failed to get regmap\n");
  63                 return -ENOENT;
  64         }
  65
  66         init_data = of_get_regulator_init_data(dev, dev->of_node,
  67                                                &qcom_usb_vbus_rdesc);
  68         if (!init_data)
  69                 return -ENOMEM;
  70
  71         qcom_usb_vbus_rdesc.enable_reg = base + CMD_OTG;
  72         qcom_usb_vbus_rdesc.enable_mask = OTG_EN;
  73         qcom_usb_vbus_rdesc.csel_reg = base + OTG_CURRENT_LIMIT_CFG;
  74         qcom_usb_vbus_rdesc.csel_mask = OTG_CURRENT_LIMIT_MASK;
  75         config.dev = dev;
  76         config.init_data = init_data;
  77         config.of_node = dev->of_node;
  78         config.regmap = regmap;
  79
  80         rdev = devm_regulator_register(dev, &qcom_usb_vbus_rdesc, &config);
  81         if (IS_ERR(rdev)) {
  82                 ret = PTR_ERR(rdev);
  83                 dev_err(dev, "not able to register vbus reg %d\n", ret);
  84                 return ret;
  85         }
  86
  87         /* Disable HW logic for VBUS enable */
  88         regmap_update_bits(regmap, base + OTG_CFG, OTG_EN_SRC_CFG, 0);
  89
  90         return 0;
  91 }
  92
  93 static const struct of_device_id qcom_usb_vbus_regulator_match[] = {
  94         { .compatible = "qcom,pm8150b-vbus-reg" },
  95         { }
  96 };
  97 MODULE_DEVICE_TABLE(of, qcom_usb_vbus_regulator_match);
  98
  99 static struct platform_driver qcom_usb_vbus_regulator_driver = {
 100         .driver         = {
 101                 .name   = "qcom-usb-vbus-regulator",
 102                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
 103                 .of_match_table = qcom_usb_vbus_regulator_match,
 104         },
 105         .probe          = qcom_usb_vbus_regulator_probe,
 106 };
 107 module_platform_driver(qcom_usb_vbus_regulator_driver);
 108
 109 MODULE_DESCRIPTION("Qualcomm USB vbus regulator driver");
 110 MODULE_LICENSE("GPL v2");