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 if (IS_ERR(hisi_hikey_usb->reset)) 172 return PTR_ERR(hisi_hikey_usb->reset); 173 174 return 0; 175 } 176 177 static int hisi_hikey_usb_probe(struct platform_device *pdev) 178 { 179 struct device *dev = &pdev->dev; 180 struct hisi_hikey_usb *hisi_hikey_usb; 181 struct usb_role_switch_desc hub_role_switch = {NULL}; 182 int ret; 183 184 hisi_hikey_usb = devm_kzalloc(dev, sizeof(*hisi_hikey_usb), GFP_KERNEL); 185 if (!hisi_hikey_usb) 186 return -ENOMEM; 187 188 hisi_hikey_usb->dev = &pdev->dev; 189 190 hisi_hikey_usb->otg_switch = devm_gpiod_get(dev, "otg-switch", 191 GPIOD_OUT_HIGH); 192 if (IS_ERR(hisi_hikey_usb->otg_switch)) 193 return PTR_ERR(hisi_hikey_usb->otg_switch); 194 195 hisi_hikey_usb->typec_vbus = devm_gpiod_get(dev, "typec-vbus", 196 GPIOD_OUT_LOW); 197 if (IS_ERR(hisi_hikey_usb->typec_vbus)) 198 return PTR_ERR(hisi_hikey_usb->typec_vbus); 199 200 /* Parse Kirin 970-specific OF data */ 201 if (of_device_is_compatible(pdev->dev.of_node, 202 "hisilicon,kirin970_hikey_usbhub")) { 203 ret = hisi_hikey_usb_parse_kirin970(pdev, hisi_hikey_usb); 204 if (ret) 205 return ret; 206 } else { 207 /* hub-vdd33-en is optional */ 208 hisi_hikey_usb->hub_vbus = devm_gpiod_get_optional(dev, "hub-vdd33-en", 209 GPIOD_OUT_HIGH); 210 if (IS_ERR(hisi_hikey_usb->hub_vbus)) 211 return PTR_ERR(hisi_hikey_usb->hub_vbus); 212 } 213 214 hisi_hikey_usb->dev_role_sw = usb_role_switch_get(dev); 215 if (!hisi_hikey_usb->dev_role_sw) 216 return -EPROBE_DEFER; 217 if (IS_ERR(hisi_hikey_usb->dev_role_sw)) 218 return PTR_ERR(hisi_hikey_usb->dev_role_sw); 219 220 INIT_WORK(&hisi_hikey_usb->work, relay_set_role_switch); 221 mutex_init(&hisi_hikey_usb->lock); 222 223 hub_role_switch.fwnode = dev_fwnode(dev); 224 hub_role_switch.set = hub_usb_role_switch_set; 225 hub_role_switch.driver_data = hisi_hikey_usb; 226 227 hisi_hikey_usb->hub_role_sw = usb_role_switch_register(dev, 228 &hub_role_switch); 229 230 if (IS_ERR(hisi_hikey_usb->hub_role_sw)) { 231 usb_role_switch_put(hisi_hikey_usb->dev_role_sw); 232 return PTR_ERR(hisi_hikey_usb->hub_role_sw); 233 } 234 235 platform_set_drvdata(pdev, hisi_hikey_usb); 236 237 return 0; 238 } 239 240 static int hisi_hikey_usb_remove(struct platform_device *pdev) 241 { 242 struct hisi_hikey_usb *hisi_hikey_usb = platform_get_drvdata(pdev); 243 244 if (hisi_hikey_usb->hub_role_sw) 245 usb_role_switch_unregister(hisi_hikey_usb->hub_role_sw); 246 247 if (hisi_hikey_usb->dev_role_sw) 248 usb_role_switch_put(hisi_hikey_usb->dev_role_sw); 249 250 return 0; 251 } 252 253 static const struct of_device_id id_table_hisi_hikey_usb[] = { 254 { .compatible = "hisilicon,gpio_hubv1" }, 255 { .compatible = "hisilicon,kirin970_hikey_usbhub" }, 256 {} 257 }; 258 MODULE_DEVICE_TABLE(of, id_table_hisi_hikey_usb); 259 260 static struct platform_driver hisi_hikey_usb_driver = { 261 .probe = hisi_hikey_usb_probe, 262 .remove = hisi_hikey_usb_remove, 263 .driver = { 264 .name = DEVICE_DRIVER_NAME, 265 .of_match_table = id_table_hisi_hikey_usb, 266 }, 267 }; 268 269 module_platform_driver(hisi_hikey_usb_driver); 270 271 MODULE_AUTHOR("Yu Chen <chenyu56@huawei.com>"); 272 MODULE_DESCRIPTION("Driver Support for USB functionality of Hikey"); 273 MODULE_LICENSE("GPL v2"); 274