drivers/regulator/qcom_usb_vbus-regulator.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 //
0003 // Qualcomm PMIC VBUS output regulator driver
0004 //
0005 // Copyright (c) 2020, The Linux Foundation. All rights reserved.
0006
0007 #include <linux/module.h>
0008 #include <linux/err.h>
0009 #include <linux/kernel.h>
0010 #include <linux/of.h>
0011 #include <linux/of_device.h>
0012 #include <linux/platform_device.h>
0013 #include <linux/regulator/driver.h>
0014 #include <linux/regulator/of_regulator.h>
0015 #include <linux/regmap.h>
0016
0017 #define CMD_OTG             0x40
0018 #define OTG_EN              BIT(0)
0019 #define OTG_CURRENT_LIMIT_CFG       0x52
0020 #define OTG_CURRENT_LIMIT_MASK      GENMASK(2, 0)
0021 #define OTG_CFG             0x53
0022 #define OTG_EN_SRC_CFG          BIT(1)
0023
0024 static const unsigned int curr_table[] = {
0025     500000, 1000000, 1500000, 2000000, 2500000, 3000000,
0026 };
0027
0028 static const struct regulator_ops qcom_usb_vbus_reg_ops = {
0029     .enable = regulator_enable_regmap,
0030     .disable = regulator_disable_regmap,
0031     .is_enabled = regulator_is_enabled_regmap,
0032     .get_current_limit = regulator_get_current_limit_regmap,
0033     .set_current_limit = regulator_set_current_limit_regmap,
0034 };
0035
0036 static struct regulator_desc qcom_usb_vbus_rdesc = {
0037     .name = "usb_vbus",
0038     .ops = &qcom_usb_vbus_reg_ops,
0039     .owner = THIS_MODULE,
0040     .type = REGULATOR_VOLTAGE,
0041     .curr_table = curr_table,
0042     .n_current_limits = ARRAY_SIZE(curr_table),
0043 };
0044
0045 static int qcom_usb_vbus_regulator_probe(struct platform_device *pdev)
0046 {
0047     struct device *dev = &pdev->dev;
0048     struct regulator_dev *rdev;
0049     struct regmap *regmap;
0050     struct regulator_config config = { };
0051     struct regulator_init_data *init_data;
0052     int ret;
0053     u32 base;
0054
0055     ret = of_property_read_u32(dev->of_node, "reg", &base);
0056     if (ret < 0) {
0057         dev_err(dev, "no base address found\n");
0058         return ret;
0059     }
0060
0061     regmap = dev_get_regmap(dev->parent, NULL);
0062     if (!regmap) {
0063         dev_err(dev, "Failed to get regmap\n");
0064         return -ENOENT;
0065     }
0066
0067     init_data = of_get_regulator_init_data(dev, dev->of_node,
0068                            &qcom_usb_vbus_rdesc);
0069     if (!init_data)
0070         return -ENOMEM;
0071
0072     qcom_usb_vbus_rdesc.enable_reg = base + CMD_OTG;
0073     qcom_usb_vbus_rdesc.enable_mask = OTG_EN;
0074     qcom_usb_vbus_rdesc.csel_reg = base + OTG_CURRENT_LIMIT_CFG;
0075     qcom_usb_vbus_rdesc.csel_mask = OTG_CURRENT_LIMIT_MASK;
0076     config.dev = dev;
0077     config.init_data = init_data;
0078     config.of_node = dev->of_node;
0079     config.regmap = regmap;
0080
0081     rdev = devm_regulator_register(dev, &qcom_usb_vbus_rdesc, &config);
0082     if (IS_ERR(rdev)) {
0083         ret = PTR_ERR(rdev);
0084         dev_err(dev, "not able to register vbus reg %d\n", ret);
0085         return ret;
0086     }
0087
0088     /* Disable HW logic for VBUS enable */
0089     regmap_update_bits(regmap, base + OTG_CFG, OTG_EN_SRC_CFG, 0);
0090
0091     return 0;
0092 }
0093
0094 static const struct of_device_id qcom_usb_vbus_regulator_match[] = {
0095     { .compatible = "qcom,pm8150b-vbus-reg" },
0096     { }
0097 };
0098 MODULE_DEVICE_TABLE(of, qcom_usb_vbus_regulator_match);
0099
0100 static struct platform_driver qcom_usb_vbus_regulator_driver = {
0101     .driver     = {
0102         .name   = "qcom-usb-vbus-regulator",
0103         .of_match_table = qcom_usb_vbus_regulator_match,
0104     },
0105     .probe      = qcom_usb_vbus_regulator_probe,
0106 };
0107 module_platform_driver(qcom_usb_vbus_regulator_driver);
0108
0109 MODULE_DESCRIPTION("Qualcomm USB vbus regulator driver");
0110 MODULE_LICENSE("GPL v2");