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");
111