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 22 static 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 28 static 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 35 static 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.of_node = dev->of_node; 67 config.regmap = regmap; 68 69 rdev = devm_regulator_register(dev, &qcom_usb_vbus_rdesc, &config); 70 if (IS_ERR(rdev)) { 71 ret = PTR_ERR(rdev); 72 dev_err(dev, "not able to register vbus reg %d\n", ret); 73 return ret; 74 } 75 76 /* Disable HW logic for VBUS enable */ 77 regmap_update_bits(regmap, base + OTG_CFG, OTG_EN_SRC_CFG, 0); 78 79 return 0; 80 } 81 82 static const struct of_device_id qcom_usb_vbus_regulator_match[] = { 83 { .compatible = "qcom,pm8150b-vbus-reg" }, 84 { } 85 }; 86 MODULE_DEVICE_TABLE(of, qcom_usb_vbus_regulator_match); 87 88 static struct platform_driver qcom_usb_vbus_regulator_driver = { 89 .driver = { 90 .name = "qcom-usb-vbus-regulator", 91 .of_match_table = qcom_usb_vbus_regulator_match, 92 }, 93 .probe = qcom_usb_vbus_regulator_probe, 94 }; 95 module_platform_driver(qcom_usb_vbus_regulator_driver); 96 97 MODULE_DESCRIPTION("Qualcomm USB vbus regulator driver"); 98 MODULE_LICENSE("GPL v2"); 99