112 lines
3.0 KiB
C
112 lines
3.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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//
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// Qualcomm PMIC VBUS output regulator driver
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//
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// Copyright (c) 2020, The Linux Foundation. All rights reserved.
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#include <linux/module.h>
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#include <linux/err.h>
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#include <linux/kernel.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/regulator/driver.h>
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#include <linux/regulator/of_regulator.h>
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#include <linux/regmap.h>
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#define CMD_OTG 0x40
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#define OTG_EN BIT(0)
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#define OTG_CURRENT_LIMIT_CFG 0x52
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#define OTG_CURRENT_LIMIT_MASK GENMASK(2, 0)
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#define OTG_CFG 0x53
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#define OTG_EN_SRC_CFG BIT(1)
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static const unsigned int curr_table[] = {
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500000, 1000000, 1500000, 2000000, 2500000, 3000000,
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};
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static const struct regulator_ops qcom_usb_vbus_reg_ops = {
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.enable = regulator_enable_regmap,
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.disable = regulator_disable_regmap,
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.is_enabled = regulator_is_enabled_regmap,
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.get_current_limit = regulator_get_current_limit_regmap,
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.set_current_limit = regulator_set_current_limit_regmap,
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};
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static struct regulator_desc qcom_usb_vbus_rdesc = {
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.name = "usb_vbus",
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.ops = &qcom_usb_vbus_reg_ops,
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.owner = THIS_MODULE,
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.type = REGULATOR_VOLTAGE,
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.curr_table = curr_table,
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.n_current_limits = ARRAY_SIZE(curr_table),
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};
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static int qcom_usb_vbus_regulator_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct regulator_dev *rdev;
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struct regmap *regmap;
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struct regulator_config config = { };
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struct regulator_init_data *init_data;
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int ret;
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u32 base;
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ret = of_property_read_u32(dev->of_node, "reg", &base);
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if (ret < 0) {
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dev_err(dev, "no base address found\n");
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return ret;
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}
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regmap = dev_get_regmap(dev->parent, NULL);
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if (!regmap) {
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dev_err(dev, "Failed to get regmap\n");
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return -ENOENT;
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}
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init_data = of_get_regulator_init_data(dev, dev->of_node,
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&qcom_usb_vbus_rdesc);
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if (!init_data)
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return -ENOMEM;
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qcom_usb_vbus_rdesc.enable_reg = base + CMD_OTG;
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qcom_usb_vbus_rdesc.enable_mask = OTG_EN;
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qcom_usb_vbus_rdesc.csel_reg = base + OTG_CURRENT_LIMIT_CFG;
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qcom_usb_vbus_rdesc.csel_mask = OTG_CURRENT_LIMIT_MASK;
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config.dev = dev;
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config.init_data = init_data;
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config.of_node = dev->of_node;
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config.regmap = regmap;
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rdev = devm_regulator_register(dev, &qcom_usb_vbus_rdesc, &config);
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if (IS_ERR(rdev)) {
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ret = PTR_ERR(rdev);
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dev_err(dev, "not able to register vbus reg %d\n", ret);
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return ret;
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}
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/* Disable HW logic for VBUS enable */
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regmap_update_bits(regmap, base + OTG_CFG, OTG_EN_SRC_CFG, 0);
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return 0;
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}
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static const struct of_device_id qcom_usb_vbus_regulator_match[] = {
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{ .compatible = "qcom,pm8150b-vbus-reg" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, qcom_usb_vbus_regulator_match);
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static struct platform_driver qcom_usb_vbus_regulator_driver = {
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.driver = {
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.name = "qcom-usb-vbus-regulator",
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.probe_type = PROBE_PREFER_ASYNCHRONOUS,
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.of_match_table = qcom_usb_vbus_regulator_match,
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},
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.probe = qcom_usb_vbus_regulator_probe,
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};
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module_platform_driver(qcom_usb_vbus_regulator_driver);
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MODULE_DESCRIPTION("Qualcomm USB vbus regulator driver");
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MODULE_LICENSE("GPL v2");
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