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(dev->of_node, "reg", &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->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, dev->of_node, 67 &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, &qcom_usb_vbus_rdesc, &config); 81 if (IS_ERR(rdev)) { 82 ret = PTR_ERR(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(regmap, base + OTG_CFG, OTG_EN_SRC_CFG, 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