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
22static 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
28static 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
35static 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.regmap = regmap;
67
68	rdev = devm_regulator_register(dev, &qcom_usb_vbus_rdesc, &config);
69	if (IS_ERR(rdev)) {
70		ret = PTR_ERR(rdev);
71		dev_err(dev, "not able to register vbus reg %d\n", ret);
72		return ret;
73	}
74
75	/* Disable HW logic for VBUS enable */
76	regmap_update_bits(regmap, base + OTG_CFG, OTG_EN_SRC_CFG, 0);
77
78	return 0;
79}
80
81static const struct of_device_id qcom_usb_vbus_regulator_match[] = {
82	{ .compatible = "qcom,pm8150b-vbus-reg" },
83	{ }
84};
85MODULE_DEVICE_TABLE(of, qcom_usb_vbus_regulator_match);
86
87static struct platform_driver qcom_usb_vbus_regulator_driver = {
88	.driver		= {
89		.name	= "qcom-usb-vbus-regulator",
90		.of_match_table = qcom_usb_vbus_regulator_match,
91	},
92	.probe		= qcom_usb_vbus_regulator_probe,
93};
94module_platform_driver(qcom_usb_vbus_regulator_driver);
95
96MODULE_DESCRIPTION("Qualcomm USB vbus regulator driver");
97MODULE_LICENSE("GPL v2");