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1// SPDX-License-Identifier: GPL-2.0-only2//3// Qualcomm PMIC VBUS output regulator driver4//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 0x4017#define OTG_EN BIT(0)18#define OTG_CURRENT_LIMIT_CFG 0x5219#define OTG_CURRENT_LIMIT_MASK GENMASK(2, 0)20#define OTG_CFG 0x5321#define OTG_EN_SRC_CFG BIT(1)22 23static const unsigned int curr_table[] = {24 500000, 1000000, 1500000, 2000000, 2500000, 3000000,25};26 27static 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 35static 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 44static 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 93static const struct of_device_id qcom_usb_vbus_regulator_match[] = {94 { .compatible = "qcom,pm8150b-vbus-reg" },95 { }96};97MODULE_DEVICE_TABLE(of, qcom_usb_vbus_regulator_match);98 99static 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};107module_platform_driver(qcom_usb_vbus_regulator_driver);108 109MODULE_DESCRIPTION("Qualcomm USB vbus regulator driver");110MODULE_LICENSE("GPL v2");111