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 .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