| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * Copyright (C) 2022 Richtek Technology Corp. |
| * |
| * Author: ChiYuan Huang <cy_huang@richtek.com> |
| */ |
| |
| #include <linux/bits.h> |
| #include <linux/interrupt.h> |
| #include <linux/kernel.h> |
| #include <linux/mod_devicetable.h> |
| #include <linux/module.h> |
| #include <linux/platform_device.h> |
| #include <linux/pm_wakeup.h> |
| #include <linux/pm_wakeirq.h> |
| #include <linux/regmap.h> |
| #include <linux/regulator/consumer.h> |
| #include <linux/usb/tcpci.h> |
| #include <linux/usb/tcpm.h> |
| |
| #define MT6370_REG_SYSCTRL8 0x9B |
| |
| #define MT6370_AUTOIDLE_MASK BIT(3) |
| |
| #define MT6370_VENDOR_ID 0x29CF |
| #define MT6370_TCPC_DID_A 0x2170 |
| |
| struct mt6370_priv { |
| struct device *dev; |
| struct regulator *vbus; |
| struct tcpci *tcpci; |
| struct tcpci_data tcpci_data; |
| }; |
| |
| static const struct reg_sequence mt6370_reg_init[] = { |
| REG_SEQ(0xA0, 0x1, 1000), |
| REG_SEQ(0x81, 0x38, 0), |
| REG_SEQ(0x82, 0x82, 0), |
| REG_SEQ(0xBA, 0xFC, 0), |
| REG_SEQ(0xBB, 0x50, 0), |
| REG_SEQ(0x9E, 0x8F, 0), |
| REG_SEQ(0xA1, 0x5, 0), |
| REG_SEQ(0xA2, 0x4, 0), |
| REG_SEQ(0xA3, 0x4A, 0), |
| REG_SEQ(0xA4, 0x01, 0), |
| REG_SEQ(0x95, 0x01, 0), |
| REG_SEQ(0x80, 0x71, 0), |
| REG_SEQ(0x9B, 0x3A, 1000), |
| }; |
| |
| static int mt6370_tcpc_init(struct tcpci *tcpci, struct tcpci_data *data) |
| { |
| u16 did; |
| int ret; |
| |
| ret = regmap_register_patch(data->regmap, mt6370_reg_init, |
| ARRAY_SIZE(mt6370_reg_init)); |
| if (ret) |
| return ret; |
| |
| ret = regmap_raw_read(data->regmap, TCPC_BCD_DEV, &did, sizeof(u16)); |
| if (ret) |
| return ret; |
| |
| if (did == MT6370_TCPC_DID_A) |
| return regmap_write(data->regmap, TCPC_FAULT_CTRL, 0x80); |
| |
| return 0; |
| } |
| |
| static int mt6370_tcpc_set_vconn(struct tcpci *tcpci, struct tcpci_data *data, |
| bool enable) |
| { |
| return regmap_update_bits(data->regmap, MT6370_REG_SYSCTRL8, |
| MT6370_AUTOIDLE_MASK, |
| enable ? 0 : MT6370_AUTOIDLE_MASK); |
| } |
| |
| static int mt6370_tcpc_set_vbus(struct tcpci *tcpci, struct tcpci_data *data, |
| bool source, bool sink) |
| { |
| struct mt6370_priv *priv = container_of(data, struct mt6370_priv, |
| tcpci_data); |
| int ret; |
| |
| ret = regulator_is_enabled(priv->vbus); |
| if (ret < 0) |
| return ret; |
| |
| if (ret && !source) |
| return regulator_disable(priv->vbus); |
| |
| if (!ret && source) |
| return regulator_enable(priv->vbus); |
| |
| return 0; |
| } |
| |
| static irqreturn_t mt6370_irq_handler(int irq, void *dev_id) |
| { |
| struct mt6370_priv *priv = dev_id; |
| |
| return tcpci_irq(priv->tcpci); |
| } |
| |
| static int mt6370_check_vendor_info(struct mt6370_priv *priv) |
| { |
| struct regmap *regmap = priv->tcpci_data.regmap; |
| u16 vid; |
| int ret; |
| |
| ret = regmap_raw_read(regmap, TCPC_VENDOR_ID, &vid, sizeof(u16)); |
| if (ret) |
| return ret; |
| |
| if (vid != MT6370_VENDOR_ID) |
| return dev_err_probe(priv->dev, -ENODEV, |
| "Vendor ID not correct 0x%02x\n", vid); |
| |
| return 0; |
| } |
| |
| static void mt6370_unregister_tcpci_port(void *tcpci) |
| { |
| tcpci_unregister_port(tcpci); |
| } |
| |
| static int mt6370_tcpc_probe(struct platform_device *pdev) |
| { |
| struct mt6370_priv *priv; |
| struct device *dev = &pdev->dev; |
| int irq, ret; |
| |
| priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); |
| if (!priv) |
| return -ENOMEM; |
| |
| priv->dev = dev; |
| |
| priv->tcpci_data.regmap = dev_get_regmap(dev->parent, NULL); |
| if (!priv->tcpci_data.regmap) |
| return dev_err_probe(dev, -ENODEV, "Failed to init regmap\n"); |
| |
| ret = mt6370_check_vendor_info(priv); |
| if (ret) |
| return ret; |
| |
| irq = platform_get_irq(pdev, 0); |
| if (irq < 0) |
| return dev_err_probe(dev, irq, "Failed to get irq\n"); |
| |
| /* Assign TCPCI feature and ops */ |
| priv->tcpci_data.auto_discharge_disconnect = 1; |
| priv->tcpci_data.init = mt6370_tcpc_init; |
| priv->tcpci_data.set_vconn = mt6370_tcpc_set_vconn; |
| |
| priv->vbus = devm_regulator_get_optional(dev, "vbus"); |
| if (!IS_ERR(priv->vbus)) |
| priv->tcpci_data.set_vbus = mt6370_tcpc_set_vbus; |
| |
| priv->tcpci = tcpci_register_port(dev, &priv->tcpci_data); |
| if (IS_ERR(priv->tcpci)) |
| return dev_err_probe(dev, PTR_ERR(priv->tcpci), |
| "Failed to register tcpci port\n"); |
| |
| ret = devm_add_action_or_reset(dev, mt6370_unregister_tcpci_port, priv->tcpci); |
| if (ret) |
| return ret; |
| |
| ret = devm_request_threaded_irq(dev, irq, NULL, mt6370_irq_handler, |
| IRQF_ONESHOT, dev_name(dev), priv); |
| if (ret) |
| return dev_err_probe(dev, ret, "Failed to allocate irq\n"); |
| |
| device_init_wakeup(dev, true); |
| dev_pm_set_wake_irq(dev, irq); |
| |
| return 0; |
| } |
| |
| static int mt6370_tcpc_remove(struct platform_device *pdev) |
| { |
| dev_pm_clear_wake_irq(&pdev->dev); |
| device_init_wakeup(&pdev->dev, false); |
| |
| return 0; |
| } |
| |
| static const struct of_device_id mt6370_tcpc_devid_table[] = { |
| { .compatible = "mediatek,mt6370-tcpc" }, |
| {} |
| }; |
| MODULE_DEVICE_TABLE(of, mt6370_tcpc_devid_table); |
| |
| static struct platform_driver mt6370_tcpc_driver = { |
| .driver = { |
| .name = "mt6370-tcpc", |
| .of_match_table = mt6370_tcpc_devid_table, |
| }, |
| .probe = mt6370_tcpc_probe, |
| .remove = mt6370_tcpc_remove, |
| }; |
| module_platform_driver(mt6370_tcpc_driver); |
| |
| MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>"); |
| MODULE_DESCRIPTION("MT6370 USB Type-C Port Controller Interface Driver"); |
| MODULE_LICENSE("GPL v2"); |