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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) | |
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19 | #define OTG_CURRENT_LIMIT_CFG 0x52 |
20 | #define OTG_CURRENT_LIMIT_MASK GENMASK(2, 0) | |
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21 | #define OTG_CFG 0x53 |
22 | #define OTG_EN_SRC_CFG BIT(1) | |
23 | ||
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24 | static const unsigned int curr_table[] = { |
25 | 500000, 1000000, 1500000, 2000000, 2500000, 3000000, | |
26 | }; | |
27 | ||
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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, | |
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32 | .get_current_limit = regulator_get_current_limit_regmap, |
33 | .set_current_limit = regulator_set_current_limit_regmap, | |
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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, | |
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41 | .curr_table = curr_table, |
42 | .n_current_limits = ARRAY_SIZE(curr_table), | |
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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); | |
94462138 | 62 | if (!regmap) { |
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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; | |
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74 | qcom_usb_vbus_rdesc.csel_reg = base + OTG_CURRENT_LIMIT_CFG; |
75 | qcom_usb_vbus_rdesc.csel_mask = OTG_CURRENT_LIMIT_MASK; | |
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76 | config.dev = dev; |
77 | config.init_data = init_data; | |
66c3b96a | 78 | config.of_node = dev->of_node; |
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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 | .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"); |