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0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  * Support for usb functionality of Hikey series boards
0004  * based on Hisilicon Kirin Soc.
0005  *
0006  * Copyright (C) 2017-2018 Hilisicon Electronics Co., Ltd.
0007  *      http://www.huawei.com
0008  *
0009  * Authors: Yu Chen <chenyu56@huawei.com>
0010  */
0011 
0012 #include <linux/gpio/consumer.h>
0013 #include <linux/kernel.h>
0014 #include <linux/mod_devicetable.h>
0015 #include <linux/module.h>
0016 #include <linux/notifier.h>
0017 #include <linux/of_gpio.h>
0018 #include <linux/platform_device.h>
0019 #include <linux/property.h>
0020 #include <linux/regulator/consumer.h>
0021 #include <linux/slab.h>
0022 #include <linux/usb/role.h>
0023 
0024 #define DEVICE_DRIVER_NAME "hisi_hikey_usb"
0025 
0026 #define HUB_VBUS_POWER_ON 1
0027 #define HUB_VBUS_POWER_OFF 0
0028 #define USB_SWITCH_TO_HUB 1
0029 #define USB_SWITCH_TO_TYPEC 0
0030 #define TYPEC_VBUS_POWER_ON 1
0031 #define TYPEC_VBUS_POWER_OFF 0
0032 
0033 struct hisi_hikey_usb {
0034     struct device *dev;
0035     struct gpio_desc *otg_switch;
0036     struct gpio_desc *typec_vbus;
0037     struct gpio_desc *reset;
0038 
0039     struct regulator *regulator;
0040 
0041     struct usb_role_switch *hub_role_sw;
0042 
0043     struct usb_role_switch *dev_role_sw;
0044     enum usb_role role;
0045 
0046     struct mutex lock;
0047     struct work_struct work;
0048 
0049     struct notifier_block nb;
0050 };
0051 
0052 static void hub_power_ctrl(struct hisi_hikey_usb *hisi_hikey_usb, int value)
0053 {
0054     int ret, status;
0055 
0056     if (!hisi_hikey_usb->regulator)
0057         return;
0058 
0059     status = regulator_is_enabled(hisi_hikey_usb->regulator);
0060     if (status == !!value)
0061         return;
0062 
0063     if (value)
0064         ret = regulator_enable(hisi_hikey_usb->regulator);
0065     else
0066         ret = regulator_disable(hisi_hikey_usb->regulator);
0067 
0068     if (ret)
0069         dev_err(hisi_hikey_usb->dev,
0070             "Can't switch regulator state to %s\n",
0071             value ? "enabled" : "disabled");
0072 }
0073 
0074 static void usb_switch_ctrl(struct hisi_hikey_usb *hisi_hikey_usb,
0075                 int switch_to)
0076 {
0077     if (!hisi_hikey_usb->otg_switch)
0078         return;
0079 
0080     gpiod_set_value_cansleep(hisi_hikey_usb->otg_switch, switch_to);
0081 }
0082 
0083 static void usb_typec_power_ctrl(struct hisi_hikey_usb *hisi_hikey_usb,
0084                  int value)
0085 {
0086     if (!hisi_hikey_usb->typec_vbus)
0087         return;
0088 
0089     gpiod_set_value_cansleep(hisi_hikey_usb->typec_vbus, value);
0090 }
0091 
0092 static void relay_set_role_switch(struct work_struct *work)
0093 {
0094     struct hisi_hikey_usb *hisi_hikey_usb = container_of(work,
0095                             struct hisi_hikey_usb,
0096                             work);
0097     struct usb_role_switch *sw;
0098     enum usb_role role;
0099 
0100     if (!hisi_hikey_usb || !hisi_hikey_usb->dev_role_sw)
0101         return;
0102 
0103     mutex_lock(&hisi_hikey_usb->lock);
0104     switch (hisi_hikey_usb->role) {
0105     case USB_ROLE_NONE:
0106         usb_typec_power_ctrl(hisi_hikey_usb, TYPEC_VBUS_POWER_OFF);
0107         usb_switch_ctrl(hisi_hikey_usb, USB_SWITCH_TO_HUB);
0108         hub_power_ctrl(hisi_hikey_usb, HUB_VBUS_POWER_ON);
0109         break;
0110     case USB_ROLE_HOST:
0111         hub_power_ctrl(hisi_hikey_usb, HUB_VBUS_POWER_OFF);
0112         usb_switch_ctrl(hisi_hikey_usb, USB_SWITCH_TO_TYPEC);
0113         usb_typec_power_ctrl(hisi_hikey_usb, TYPEC_VBUS_POWER_ON);
0114         break;
0115     case USB_ROLE_DEVICE:
0116         hub_power_ctrl(hisi_hikey_usb, HUB_VBUS_POWER_OFF);
0117         usb_typec_power_ctrl(hisi_hikey_usb, TYPEC_VBUS_POWER_OFF);
0118         usb_switch_ctrl(hisi_hikey_usb, USB_SWITCH_TO_TYPEC);
0119         break;
0120     default:
0121         break;
0122     }
0123     sw = hisi_hikey_usb->dev_role_sw;
0124     role = hisi_hikey_usb->role;
0125     mutex_unlock(&hisi_hikey_usb->lock);
0126 
0127     usb_role_switch_set_role(sw, role);
0128 }
0129 
0130 static int hub_usb_role_switch_set(struct usb_role_switch *sw, enum usb_role role)
0131 {
0132     struct hisi_hikey_usb *hisi_hikey_usb = usb_role_switch_get_drvdata(sw);
0133 
0134     if (!hisi_hikey_usb || !hisi_hikey_usb->dev_role_sw)
0135         return -EINVAL;
0136 
0137     mutex_lock(&hisi_hikey_usb->lock);
0138     hisi_hikey_usb->role = role;
0139     mutex_unlock(&hisi_hikey_usb->lock);
0140 
0141     schedule_work(&hisi_hikey_usb->work);
0142 
0143     return 0;
0144 }
0145 
0146 static int hisi_hikey_usb_of_role_switch(struct platform_device *pdev,
0147                      struct hisi_hikey_usb *hisi_hikey_usb)
0148 {
0149     struct device *dev = &pdev->dev;
0150     struct usb_role_switch_desc hub_role_switch = {NULL};
0151 
0152     if (!device_property_read_bool(dev, "usb-role-switch"))
0153         return 0;
0154 
0155     hisi_hikey_usb->otg_switch = devm_gpiod_get(dev, "otg-switch",
0156                             GPIOD_OUT_HIGH);
0157     if (IS_ERR(hisi_hikey_usb->otg_switch)) {
0158         dev_err(dev, "get otg-switch failed with error %ld\n",
0159             PTR_ERR(hisi_hikey_usb->otg_switch));
0160         return PTR_ERR(hisi_hikey_usb->otg_switch);
0161     }
0162 
0163     hisi_hikey_usb->typec_vbus = devm_gpiod_get(dev, "typec-vbus",
0164                             GPIOD_OUT_LOW);
0165     if (IS_ERR(hisi_hikey_usb->typec_vbus)) {
0166         dev_err(dev, "get typec-vbus failed with error %ld\n",
0167             PTR_ERR(hisi_hikey_usb->typec_vbus));
0168         return PTR_ERR(hisi_hikey_usb->typec_vbus);
0169     }
0170 
0171     hisi_hikey_usb->reset = devm_gpiod_get_optional(dev,
0172                             "hub-reset-en",
0173                             GPIOD_OUT_HIGH);
0174     if (IS_ERR(hisi_hikey_usb->reset)) {
0175         dev_err(dev, "get hub-reset-en failed with error %ld\n",
0176             PTR_ERR(hisi_hikey_usb->reset));
0177         return PTR_ERR(hisi_hikey_usb->reset);
0178     }
0179 
0180     hisi_hikey_usb->dev_role_sw = usb_role_switch_get(dev);
0181     if (!hisi_hikey_usb->dev_role_sw)
0182         return -EPROBE_DEFER;
0183     if (IS_ERR(hisi_hikey_usb->dev_role_sw)) {
0184         dev_err(dev, "get device role switch failed with error %ld\n",
0185             PTR_ERR(hisi_hikey_usb->dev_role_sw));
0186         return PTR_ERR(hisi_hikey_usb->dev_role_sw);
0187     }
0188 
0189     INIT_WORK(&hisi_hikey_usb->work, relay_set_role_switch);
0190 
0191     hub_role_switch.fwnode = dev_fwnode(dev);
0192     hub_role_switch.set = hub_usb_role_switch_set;
0193     hub_role_switch.driver_data = hisi_hikey_usb;
0194 
0195     hisi_hikey_usb->hub_role_sw = usb_role_switch_register(dev,
0196                                    &hub_role_switch);
0197 
0198     if (IS_ERR(hisi_hikey_usb->hub_role_sw)) {
0199         dev_err(dev,
0200             "failed to register hub role with error %ld\n",
0201             PTR_ERR(hisi_hikey_usb->hub_role_sw));
0202         usb_role_switch_put(hisi_hikey_usb->dev_role_sw);
0203         return PTR_ERR(hisi_hikey_usb->hub_role_sw);
0204     }
0205 
0206     return 0;
0207 }
0208 
0209 static int hisi_hikey_usb_probe(struct platform_device *pdev)
0210 {
0211     struct device *dev = &pdev->dev;
0212     struct hisi_hikey_usb *hisi_hikey_usb;
0213     int ret;
0214 
0215     hisi_hikey_usb = devm_kzalloc(dev, sizeof(*hisi_hikey_usb), GFP_KERNEL);
0216     if (!hisi_hikey_usb)
0217         return -ENOMEM;
0218 
0219     hisi_hikey_usb->dev = &pdev->dev;
0220     mutex_init(&hisi_hikey_usb->lock);
0221 
0222     hisi_hikey_usb->regulator = devm_regulator_get(dev, "hub-vdd");
0223     if (IS_ERR(hisi_hikey_usb->regulator)) {
0224         if (PTR_ERR(hisi_hikey_usb->regulator) == -EPROBE_DEFER) {
0225             dev_info(dev, "waiting for hub-vdd-supply\n");
0226             return PTR_ERR(hisi_hikey_usb->regulator);
0227         }
0228         dev_err(dev, "get hub-vdd-supply failed with error %ld\n",
0229             PTR_ERR(hisi_hikey_usb->regulator));
0230         return PTR_ERR(hisi_hikey_usb->regulator);
0231     }
0232 
0233     ret = hisi_hikey_usb_of_role_switch(pdev, hisi_hikey_usb);
0234     if (ret)
0235         return ret;
0236 
0237     platform_set_drvdata(pdev, hisi_hikey_usb);
0238 
0239     return 0;
0240 }
0241 
0242 static int  hisi_hikey_usb_remove(struct platform_device *pdev)
0243 {
0244     struct hisi_hikey_usb *hisi_hikey_usb = platform_get_drvdata(pdev);
0245 
0246     if (hisi_hikey_usb->hub_role_sw) {
0247         usb_role_switch_unregister(hisi_hikey_usb->hub_role_sw);
0248 
0249         if (hisi_hikey_usb->dev_role_sw)
0250             usb_role_switch_put(hisi_hikey_usb->dev_role_sw);
0251     } else {
0252         hub_power_ctrl(hisi_hikey_usb, HUB_VBUS_POWER_OFF);
0253     }
0254 
0255     return 0;
0256 }
0257 
0258 static const struct of_device_id id_table_hisi_hikey_usb[] = {
0259     { .compatible = "hisilicon,usbhub" },
0260     {}
0261 };
0262 MODULE_DEVICE_TABLE(of, id_table_hisi_hikey_usb);
0263 
0264 static struct platform_driver hisi_hikey_usb_driver = {
0265     .probe = hisi_hikey_usb_probe,
0266     .remove = hisi_hikey_usb_remove,
0267     .driver = {
0268         .name = DEVICE_DRIVER_NAME,
0269         .of_match_table = id_table_hisi_hikey_usb,
0270     },
0271 };
0272 
0273 module_platform_driver(hisi_hikey_usb_driver);
0274 
0275 MODULE_AUTHOR("Yu Chen <chenyu56@huawei.com>");
0276 MODULE_DESCRIPTION("Driver Support for USB functionality of Hikey");
0277 MODULE_LICENSE("GPL v2");
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