drivers/misc/hisi_hikey_usb.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Support for usb functionality of Hikey series boards
   4  * based on Hisilicon Kirin Soc.
   5  *
   6  * Copyright (C) 2017-2018 Hilisicon Electronics Co., Ltd.
   7  *              http://www.huawei.com
   8  *
   9  * Authors: Yu Chen <chenyu56@huawei.com>
  10  */
  11
  12 #include <linux/gpio/consumer.h>
  13 #include <linux/kernel.h>
  14 #include <linux/mod_devicetable.h>
  15 #include <linux/module.h>
  16 #include <linux/notifier.h>
  17 #include <linux/of_gpio.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/property.h>
  20 #include <linux/regulator/consumer.h>
  21 #include <linux/slab.h>
  22 #include <linux/usb/role.h>
  23
  24 #define DEVICE_DRIVER_NAME "hisi_hikey_usb"
  25
  26 #define HUB_VBUS_POWER_ON 1
  27 #define HUB_VBUS_POWER_OFF 0
  28 #define USB_SWITCH_TO_HUB 1
  29 #define USB_SWITCH_TO_TYPEC 0
  30 #define TYPEC_VBUS_POWER_ON 1
  31 #define TYPEC_VBUS_POWER_OFF 0
  32
  33 struct hisi_hikey_usb {
  34         struct device *dev;
  35         struct gpio_desc *otg_switch;
  36         struct gpio_desc *typec_vbus;
  37         struct gpio_desc *hub_vbus;
  38         struct gpio_desc *reset;
  39
  40         struct regulator *regulator;
  41
  42         struct usb_role_switch *hub_role_sw;
  43
  44         struct usb_role_switch *dev_role_sw;
  45         enum usb_role role;
  46
  47         struct mutex lock;
  48         struct work_struct work;
  49
  50         struct notifier_block nb;
  51 };
  52
  53 static void hub_power_ctrl(struct hisi_hikey_usb *hisi_hikey_usb, int value)
  54 {
  55         int ret, status;
  56
  57         if (hisi_hikey_usb->hub_vbus)
  58                 gpiod_set_value_cansleep(hisi_hikey_usb->hub_vbus, value);
  59
  60         if (!hisi_hikey_usb->regulator)
  61                 return;
  62
  63         status = regulator_is_enabled(hisi_hikey_usb->regulator);
  64         if (status == !!value)
  65                 return;
  66
  67         if (value)
  68                 ret = regulator_enable(hisi_hikey_usb->regulator);
  69         else
  70                 ret = regulator_disable(hisi_hikey_usb->regulator);
  71
  72         if (ret)
  73                 dev_err(hisi_hikey_usb->dev,
  74                         "Can't switch regulator state to %s\n",
  75                         value ? "enabled" : "disabled");
  76 }
  77
  78 static void usb_switch_ctrl(struct hisi_hikey_usb *hisi_hikey_usb,
  79                             int switch_to)
  80 {
  81         if (!hisi_hikey_usb->otg_switch)
  82                 return;
  83
  84         gpiod_set_value_cansleep(hisi_hikey_usb->otg_switch, switch_to);
  85 }
  86
  87 static void usb_typec_power_ctrl(struct hisi_hikey_usb *hisi_hikey_usb,
  88                                  int value)
  89 {
  90         if (!hisi_hikey_usb->typec_vbus)
  91                 return;
  92
  93         gpiod_set_value_cansleep(hisi_hikey_usb->typec_vbus, value);
  94 }
  95
  96 static void relay_set_role_switch(struct work_struct *work)
  97 {
  98         struct hisi_hikey_usb *hisi_hikey_usb = container_of(work,
  99                                                         struct hisi_hikey_usb,
 100                                                         work);
 101         struct usb_role_switch *sw;
 102         enum usb_role role;
 103
 104         if (!hisi_hikey_usb || !hisi_hikey_usb->dev_role_sw)
 105                 return;
 106
 107         mutex_lock(&hisi_hikey_usb->lock);
 108         switch (hisi_hikey_usb->role) {
 109         case USB_ROLE_NONE:
 110                 usb_typec_power_ctrl(hisi_hikey_usb, TYPEC_VBUS_POWER_OFF);
 111                 usb_switch_ctrl(hisi_hikey_usb, USB_SWITCH_TO_HUB);
 112                 hub_power_ctrl(hisi_hikey_usb, HUB_VBUS_POWER_ON);
 113                 break;
 114         case USB_ROLE_HOST:
 115                 hub_power_ctrl(hisi_hikey_usb, HUB_VBUS_POWER_OFF);
 116                 usb_switch_ctrl(hisi_hikey_usb, USB_SWITCH_TO_TYPEC);
 117                 usb_typec_power_ctrl(hisi_hikey_usb, TYPEC_VBUS_POWER_ON);
 118                 break;
 119         case USB_ROLE_DEVICE:
 120                 hub_power_ctrl(hisi_hikey_usb, HUB_VBUS_POWER_OFF);
 121                 usb_typec_power_ctrl(hisi_hikey_usb, TYPEC_VBUS_POWER_OFF);
 122                 usb_switch_ctrl(hisi_hikey_usb, USB_SWITCH_TO_TYPEC);
 123                 break;
 124         default:
 125                 break;
 126         }
 127         sw = hisi_hikey_usb->dev_role_sw;
 128         role = hisi_hikey_usb->role;
 129         mutex_unlock(&hisi_hikey_usb->lock);
 130
 131         usb_role_switch_set_role(sw, role);
 132 }
 133
 134 static int hub_usb_role_switch_set(struct usb_role_switch *sw, enum usb_role role)
 135 {
 136         struct hisi_hikey_usb *hisi_hikey_usb = usb_role_switch_get_drvdata(sw);
 137
 138         if (!hisi_hikey_usb || !hisi_hikey_usb->dev_role_sw)
 139                 return -EINVAL;
 140
 141         mutex_lock(&hisi_hikey_usb->lock);
 142         hisi_hikey_usb->role = role;
 143         mutex_unlock(&hisi_hikey_usb->lock);
 144
 145         schedule_work(&hisi_hikey_usb->work);
 146
 147         return 0;
 148 }
 149
 150 static int hisi_hikey_usb_parse_kirin970(struct platform_device *pdev,
 151                                          struct hisi_hikey_usb *hisi_hikey_usb)
 152 {
 153         struct regulator *regulator;
 154
 155         regulator = devm_regulator_get(&pdev->dev, "hub-vdd");
 156         if (IS_ERR(regulator)) {
 157                 if (PTR_ERR(regulator) == -EPROBE_DEFER) {
 158                         dev_info(&pdev->dev,
 159                                  "waiting for hub-vdd-supply to be probed\n");
 160                         return PTR_ERR(regulator);
 161                 }
 162                 dev_err(&pdev->dev,
 163                         "get hub-vdd-supply failed with error %ld\n",
 164                         PTR_ERR(regulator));
 165                 return PTR_ERR(regulator);
 166         }
 167         hisi_hikey_usb->regulator = regulator;
 168
 169         hisi_hikey_usb->reset = devm_gpiod_get(&pdev->dev, "hub_reset_en_gpio",
 170                                                GPIOD_OUT_HIGH);
 171         return PTR_ERR_OR_ZERO(hisi_hikey_usb->reset);
 172 }
 173
 174 static int hisi_hikey_usb_probe(struct platform_device *pdev)
 175 {
 176         struct device *dev = &pdev->dev;
 177         struct hisi_hikey_usb *hisi_hikey_usb;
 178         struct usb_role_switch_desc hub_role_switch = {NULL};
 179         int ret;
 180
 181         hisi_hikey_usb = devm_kzalloc(dev, sizeof(*hisi_hikey_usb), GFP_KERNEL);
 182         if (!hisi_hikey_usb)
 183                 return -ENOMEM;
 184
 185         hisi_hikey_usb->dev = &pdev->dev;
 186
 187         hisi_hikey_usb->otg_switch = devm_gpiod_get(dev, "otg-switch",
 188                                                     GPIOD_OUT_HIGH);
 189         if (IS_ERR(hisi_hikey_usb->otg_switch))
 190                 return PTR_ERR(hisi_hikey_usb->otg_switch);
 191
 192         hisi_hikey_usb->typec_vbus = devm_gpiod_get(dev, "typec-vbus",
 193                                                     GPIOD_OUT_LOW);
 194         if (IS_ERR(hisi_hikey_usb->typec_vbus))
 195                 return PTR_ERR(hisi_hikey_usb->typec_vbus);
 196
 197         /* Parse Kirin 970-specific OF data */
 198         if (of_device_is_compatible(pdev->dev.of_node,
 199                                     "hisilicon,kirin970_hikey_usbhub")) {
 200                 ret = hisi_hikey_usb_parse_kirin970(pdev, hisi_hikey_usb);
 201                 if (ret)
 202                         return ret;
 203         } else {
 204                 /* hub-vdd33-en is optional */
 205                 hisi_hikey_usb->hub_vbus = devm_gpiod_get_optional(dev, "hub-vdd33-en",
 206                                                                    GPIOD_OUT_HIGH);
 207                 if (IS_ERR(hisi_hikey_usb->hub_vbus))
 208                         return PTR_ERR(hisi_hikey_usb->hub_vbus);
 209         }
 210
 211         hisi_hikey_usb->dev_role_sw = usb_role_switch_get(dev);
 212         if (!hisi_hikey_usb->dev_role_sw)
 213                 return -EPROBE_DEFER;
 214         if (IS_ERR(hisi_hikey_usb->dev_role_sw))
 215                 return PTR_ERR(hisi_hikey_usb->dev_role_sw);
 216
 217         INIT_WORK(&hisi_hikey_usb->work, relay_set_role_switch);
 218         mutex_init(&hisi_hikey_usb->lock);
 219
 220         hub_role_switch.fwnode = dev_fwnode(dev);
 221         hub_role_switch.set = hub_usb_role_switch_set;
 222         hub_role_switch.driver_data = hisi_hikey_usb;
 223
 224         hisi_hikey_usb->hub_role_sw = usb_role_switch_register(dev,
 225                                                                &hub_role_switch);
 226
 227         if (IS_ERR(hisi_hikey_usb->hub_role_sw)) {
 228                 usb_role_switch_put(hisi_hikey_usb->dev_role_sw);
 229                 return PTR_ERR(hisi_hikey_usb->hub_role_sw);
 230         }
 231
 232         platform_set_drvdata(pdev, hisi_hikey_usb);
 233
 234         return 0;
 235 }
 236
 237 static int  hisi_hikey_usb_remove(struct platform_device *pdev)
 238 {
 239         struct hisi_hikey_usb *hisi_hikey_usb = platform_get_drvdata(pdev);
 240
 241         if (hisi_hikey_usb->hub_role_sw)
 242                 usb_role_switch_unregister(hisi_hikey_usb->hub_role_sw);
 243
 244         if (hisi_hikey_usb->dev_role_sw)
 245                 usb_role_switch_put(hisi_hikey_usb->dev_role_sw);
 246
 247         return 0;
 248 }
 249
 250 static const struct of_device_id id_table_hisi_hikey_usb[] = {
 251         { .compatible = "hisilicon,gpio_hubv1" },
 252         { .compatible = "hisilicon,kirin970_hikey_usbhub" },
 253         {}
 254 };
 255 MODULE_DEVICE_TABLE(of, id_table_hisi_hikey_usb);
 256
 257 static struct platform_driver hisi_hikey_usb_driver = {
 258         .probe = hisi_hikey_usb_probe,
 259         .remove = hisi_hikey_usb_remove,
 260         .driver = {
 261                 .name = DEVICE_DRIVER_NAME,
 262                 .of_match_table = id_table_hisi_hikey_usb,
 263         },
 264 };
 265
 266 module_platform_driver(hisi_hikey_usb_driver);
 267
 268 MODULE_AUTHOR("Yu Chen <chenyu56@huawei.com>");
 269 MODULE_DESCRIPTION("Driver Support for USB functionality of Hikey");
 270 MODULE_LICENSE("GPL v2");