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 | |
23 | static const unsigned int curr_table[] = { |
24 | 500000, 1000000, 1500000, 2000000, 2500000, 3000000, |
25 | }; |
26 | |
27 | static 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 | |
35 | static 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 | |
44 | static 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(np: dev->of_node, propname: "reg" , out_value: &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: 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, node: dev->of_node, |
67 | desc: &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, regulator_desc: &qcom_usb_vbus_rdesc, config: &config); |
81 | if (IS_ERR(ptr: rdev)) { |
82 | ret = PTR_ERR(ptr: 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(map: regmap, reg: base + OTG_CFG, OTG_EN_SRC_CFG, val: 0); |
89 | |
90 | return 0; |
91 | } |
92 | |
93 | static const struct of_device_id qcom_usb_vbus_regulator_match[] = { |
94 | { .compatible = "qcom,pm8150b-vbus-reg" }, |
95 | { } |
96 | }; |
97 | MODULE_DEVICE_TABLE(of, qcom_usb_vbus_regulator_match); |
98 | |
99 | static 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 | }; |
107 | module_platform_driver(qcom_usb_vbus_regulator_driver); |
108 | |
109 | MODULE_DESCRIPTION("Qualcomm USB vbus regulator driver" ); |
110 | MODULE_LICENSE("GPL v2" ); |
111 | |