linux/drivers/regulator/qcom_usb_vbus-regulator.c
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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
   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_CURRENT_LIMIT_CFG           0x52
  20#define OTG_CURRENT_LIMIT_MASK          GENMASK(2, 0)
  21#define OTG_CFG                         0x53
  22#define OTG_EN_SRC_CFG                  BIT(1)
  23
  24static const unsigned int curr_table[] = {
  25        500000, 1000000, 1500000, 2000000, 2500000, 3000000,
  26};
  27
  28static const struct regulator_ops qcom_usb_vbus_reg_ops = {
  29        .enable = regulator_enable_regmap,
  30        .disable = regulator_disable_regmap,
  31        .is_enabled = regulator_is_enabled_regmap,
  32        .get_current_limit = regulator_get_current_limit_regmap,
  33        .set_current_limit = regulator_set_current_limit_regmap,
  34};
  35
  36static struct regulator_desc qcom_usb_vbus_rdesc = {
  37        .name = "usb_vbus",
  38        .ops = &qcom_usb_vbus_reg_ops,
  39        .owner = THIS_MODULE,
  40        .type = REGULATOR_VOLTAGE,
  41        .curr_table = curr_table,
  42        .n_current_limits = ARRAY_SIZE(curr_table),
  43};
  44
  45static int qcom_usb_vbus_regulator_probe(struct platform_device *pdev)
  46{
  47        struct device *dev = &pdev->dev;
  48        struct regulator_dev *rdev;
  49        struct regmap *regmap;
  50        struct regulator_config config = { };
  51        struct regulator_init_data *init_data;
  52        int ret;
  53        u32 base;
  54
  55        ret = of_property_read_u32(dev->of_node, "reg", &base);
  56        if (ret < 0) {
  57                dev_err(dev, "no base address found\n");
  58                return ret;
  59        }
  60
  61        regmap = dev_get_regmap(dev->parent, NULL);
  62        if (!regmap) {
  63                dev_err(dev, "Failed to get regmap\n");
  64                return -ENOENT;
  65        }
  66
  67        init_data = of_get_regulator_init_data(dev, dev->of_node,
  68                                               &qcom_usb_vbus_rdesc);
  69        if (!init_data)
  70                return -ENOMEM;
  71
  72        qcom_usb_vbus_rdesc.enable_reg = base + CMD_OTG;
  73        qcom_usb_vbus_rdesc.enable_mask = OTG_EN;
  74        qcom_usb_vbus_rdesc.csel_reg = base + OTG_CURRENT_LIMIT_CFG;
  75        qcom_usb_vbus_rdesc.csel_mask = OTG_CURRENT_LIMIT_MASK;
  76        config.dev = dev;
  77        config.init_data = init_data;
  78        config.of_node = dev->of_node;
  79        config.regmap = regmap;
  80
  81        rdev = devm_regulator_register(dev, &qcom_usb_vbus_rdesc, &config);
  82        if (IS_ERR(rdev)) {
  83                ret = PTR_ERR(rdev);
  84                dev_err(dev, "not able to register vbus reg %d\n", ret);
  85                return ret;
  86        }
  87
  88        /* Disable HW logic for VBUS enable */
  89        regmap_update_bits(regmap, base + OTG_CFG, OTG_EN_SRC_CFG, 0);
  90
  91        return 0;
  92}
  93
  94static const struct of_device_id qcom_usb_vbus_regulator_match[] = {
  95        { .compatible = "qcom,pm8150b-vbus-reg" },
  96        { }
  97};
  98MODULE_DEVICE_TABLE(of, qcom_usb_vbus_regulator_match);
  99
 100static struct platform_driver qcom_usb_vbus_regulator_driver = {
 101        .driver         = {
 102                .name   = "qcom-usb-vbus-regulator",
 103                .of_match_table = qcom_usb_vbus_regulator_match,
 104        },
 105        .probe          = qcom_usb_vbus_regulator_probe,
 106};
 107module_platform_driver(qcom_usb_vbus_regulator_driver);
 108
 109MODULE_DESCRIPTION("Qualcomm USB vbus regulator driver");
 110MODULE_LICENSE("GPL v2");
 111