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
 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");