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 
24 static const unsigned int curr_table[] = {
25 	500000, 1000000, 1500000, 2000000, 2500000, 3000000,
26 };
27 
28 static 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 
36 static 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 
45 static 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 
94 static const struct of_device_id qcom_usb_vbus_regulator_match[] = {
95 	{ .compatible = "qcom,pm8150b-vbus-reg" },
96 	{ }
97 };
98 MODULE_DEVICE_TABLE(of, qcom_usb_vbus_regulator_match);
99 
100 static struct platform_driver qcom_usb_vbus_regulator_driver = {
101 	.driver		= {
102 		.name	= "qcom-usb-vbus-regulator",
103 		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
104 		.of_match_table = qcom_usb_vbus_regulator_match,
105 	},
106 	.probe		= qcom_usb_vbus_regulator_probe,
107 };
108 module_platform_driver(qcom_usb_vbus_regulator_driver);
109 
110 MODULE_DESCRIPTION("Qualcomm USB vbus regulator driver");
111 MODULE_LICENSE("GPL v2");
112