1 /* 2 * USB PHY defines 3 * 4 * These APIs may be used between USB controllers. USB device drivers 5 * (for either host or peripheral roles) don't use these calls; they 6 * continue to use just usb_device and usb_gadget. 7 */ 8 9 #ifndef __LINUX_USB_PHY_H 10 #define __LINUX_USB_PHY_H 11 12 #include <linux/notifier.h> 13 #include <linux/usb.h> 14 15 enum usb_phy_interface { 16 USBPHY_INTERFACE_MODE_UNKNOWN, 17 USBPHY_INTERFACE_MODE_UTMI, 18 USBPHY_INTERFACE_MODE_UTMIW, 19 USBPHY_INTERFACE_MODE_ULPI, 20 USBPHY_INTERFACE_MODE_SERIAL, 21 USBPHY_INTERFACE_MODE_HSIC, 22 }; 23 24 enum usb_phy_events { 25 USB_EVENT_NONE, /* no events or cable disconnected */ 26 USB_EVENT_VBUS, /* vbus valid event */ 27 USB_EVENT_ID, /* id was grounded */ 28 USB_EVENT_CHARGER, /* usb dedicated charger */ 29 USB_EVENT_ENUMERATED, /* gadget driver enumerated */ 30 }; 31 32 /* associate a type with PHY */ 33 enum usb_phy_type { 34 USB_PHY_TYPE_UNDEFINED, 35 USB_PHY_TYPE_USB2, 36 USB_PHY_TYPE_USB3, 37 }; 38 39 /* OTG defines lots of enumeration states before device reset */ 40 enum usb_otg_state { 41 OTG_STATE_UNDEFINED = 0, 42 43 /* single-role peripheral, and dual-role default-b */ 44 OTG_STATE_B_IDLE, 45 OTG_STATE_B_SRP_INIT, 46 OTG_STATE_B_PERIPHERAL, 47 48 /* extra dual-role default-b states */ 49 OTG_STATE_B_WAIT_ACON, 50 OTG_STATE_B_HOST, 51 52 /* dual-role default-a */ 53 OTG_STATE_A_IDLE, 54 OTG_STATE_A_WAIT_VRISE, 55 OTG_STATE_A_WAIT_BCON, 56 OTG_STATE_A_HOST, 57 OTG_STATE_A_SUSPEND, 58 OTG_STATE_A_PERIPHERAL, 59 OTG_STATE_A_WAIT_VFALL, 60 OTG_STATE_A_VBUS_ERR, 61 }; 62 63 struct usb_phy; 64 struct usb_otg; 65 66 /* for transceivers connected thru an ULPI interface, the user must 67 * provide access ops 68 */ 69 struct usb_phy_io_ops { 70 int (*read)(struct usb_phy *x, u32 reg); 71 int (*write)(struct usb_phy *x, u32 val, u32 reg); 72 }; 73 74 struct usb_phy { 75 struct device *dev; 76 const char *label; 77 unsigned int flags; 78 79 enum usb_phy_type type; 80 enum usb_phy_events last_event; 81 82 struct usb_otg *otg; 83 84 struct device *io_dev; 85 struct usb_phy_io_ops *io_ops; 86 void __iomem *io_priv; 87 88 /* for notification of usb_phy_events */ 89 struct atomic_notifier_head notifier; 90 91 /* to pass extra port status to the root hub */ 92 u16 port_status; 93 u16 port_change; 94 95 /* to support controllers that have multiple transceivers */ 96 struct list_head head; 97 98 /* initialize/shutdown the OTG controller */ 99 int (*init)(struct usb_phy *x); 100 void (*shutdown)(struct usb_phy *x); 101 102 /* enable/disable VBUS */ 103 int (*set_vbus)(struct usb_phy *x, int on); 104 105 /* effective for B devices, ignored for A-peripheral */ 106 int (*set_power)(struct usb_phy *x, 107 unsigned mA); 108 109 /* Set transceiver into suspend mode */ 110 int (*set_suspend)(struct usb_phy *x, 111 int suspend); 112 113 /* 114 * Set wakeup enable for PHY, in that case, the PHY can be 115 * woken up from suspend status due to external events, 116 * like vbus change, dp/dm change and id. 117 */ 118 int (*set_wakeup)(struct usb_phy *x, bool enabled); 119 120 /* notify phy connect status change */ 121 int (*notify_connect)(struct usb_phy *x, 122 enum usb_device_speed speed); 123 int (*notify_disconnect)(struct usb_phy *x, 124 enum usb_device_speed speed); 125 }; 126 127 /** 128 * struct usb_phy_bind - represent the binding for the phy 129 * @dev_name: the device name of the device that will bind to the phy 130 * @phy_dev_name: the device name of the phy 131 * @index: used if a single controller uses multiple phys 132 * @phy: reference to the phy 133 * @list: to maintain a linked list of the binding information 134 */ 135 struct usb_phy_bind { 136 const char *dev_name; 137 const char *phy_dev_name; 138 u8 index; 139 struct usb_phy *phy; 140 struct list_head list; 141 }; 142 143 /* for board-specific init logic */ 144 extern int usb_add_phy(struct usb_phy *, enum usb_phy_type type); 145 extern int usb_add_phy_dev(struct usb_phy *); 146 extern void usb_remove_phy(struct usb_phy *); 147 148 /* helpers for direct access thru low-level io interface */ 149 static inline int usb_phy_io_read(struct usb_phy *x, u32 reg) 150 { 151 if (x && x->io_ops && x->io_ops->read) 152 return x->io_ops->read(x, reg); 153 154 return -EINVAL; 155 } 156 157 static inline int usb_phy_io_write(struct usb_phy *x, u32 val, u32 reg) 158 { 159 if (x && x->io_ops && x->io_ops->write) 160 return x->io_ops->write(x, val, reg); 161 162 return -EINVAL; 163 } 164 165 static inline int 166 usb_phy_init(struct usb_phy *x) 167 { 168 if (x && x->init) 169 return x->init(x); 170 171 return 0; 172 } 173 174 static inline void 175 usb_phy_shutdown(struct usb_phy *x) 176 { 177 if (x && x->shutdown) 178 x->shutdown(x); 179 } 180 181 static inline int 182 usb_phy_vbus_on(struct usb_phy *x) 183 { 184 if (!x || !x->set_vbus) 185 return 0; 186 187 return x->set_vbus(x, true); 188 } 189 190 static inline int 191 usb_phy_vbus_off(struct usb_phy *x) 192 { 193 if (!x || !x->set_vbus) 194 return 0; 195 196 return x->set_vbus(x, false); 197 } 198 199 /* for usb host and peripheral controller drivers */ 200 #if IS_ENABLED(CONFIG_USB_PHY) 201 extern struct usb_phy *usb_get_phy(enum usb_phy_type type); 202 extern struct usb_phy *devm_usb_get_phy(struct device *dev, 203 enum usb_phy_type type); 204 extern struct usb_phy *usb_get_phy_dev(struct device *dev, u8 index); 205 extern struct usb_phy *devm_usb_get_phy_dev(struct device *dev, u8 index); 206 extern struct usb_phy *devm_usb_get_phy_by_phandle(struct device *dev, 207 const char *phandle, u8 index); 208 extern void usb_put_phy(struct usb_phy *); 209 extern void devm_usb_put_phy(struct device *dev, struct usb_phy *x); 210 extern int usb_bind_phy(const char *dev_name, u8 index, 211 const char *phy_dev_name); 212 extern void usb_phy_set_event(struct usb_phy *x, unsigned long event); 213 #else 214 static inline struct usb_phy *usb_get_phy(enum usb_phy_type type) 215 { 216 return ERR_PTR(-ENXIO); 217 } 218 219 static inline struct usb_phy *devm_usb_get_phy(struct device *dev, 220 enum usb_phy_type type) 221 { 222 return ERR_PTR(-ENXIO); 223 } 224 225 static inline struct usb_phy *usb_get_phy_dev(struct device *dev, u8 index) 226 { 227 return ERR_PTR(-ENXIO); 228 } 229 230 static inline struct usb_phy *devm_usb_get_phy_dev(struct device *dev, u8 index) 231 { 232 return ERR_PTR(-ENXIO); 233 } 234 235 static inline struct usb_phy *devm_usb_get_phy_by_phandle(struct device *dev, 236 const char *phandle, u8 index) 237 { 238 return ERR_PTR(-ENXIO); 239 } 240 241 static inline void usb_put_phy(struct usb_phy *x) 242 { 243 } 244 245 static inline void devm_usb_put_phy(struct device *dev, struct usb_phy *x) 246 { 247 } 248 249 static inline int usb_bind_phy(const char *dev_name, u8 index, 250 const char *phy_dev_name) 251 { 252 return -EOPNOTSUPP; 253 } 254 255 static inline void usb_phy_set_event(struct usb_phy *x, unsigned long event) 256 { 257 } 258 #endif 259 260 static inline int 261 usb_phy_set_power(struct usb_phy *x, unsigned mA) 262 { 263 if (x && x->set_power) 264 return x->set_power(x, mA); 265 return 0; 266 } 267 268 /* Context: can sleep */ 269 static inline int 270 usb_phy_set_suspend(struct usb_phy *x, int suspend) 271 { 272 if (x && x->set_suspend != NULL) 273 return x->set_suspend(x, suspend); 274 else 275 return 0; 276 } 277 278 static inline int 279 usb_phy_set_wakeup(struct usb_phy *x, bool enabled) 280 { 281 if (x && x->set_wakeup) 282 return x->set_wakeup(x, enabled); 283 else 284 return 0; 285 } 286 287 static inline int 288 usb_phy_notify_connect(struct usb_phy *x, enum usb_device_speed speed) 289 { 290 if (x && x->notify_connect) 291 return x->notify_connect(x, speed); 292 else 293 return 0; 294 } 295 296 static inline int 297 usb_phy_notify_disconnect(struct usb_phy *x, enum usb_device_speed speed) 298 { 299 if (x && x->notify_disconnect) 300 return x->notify_disconnect(x, speed); 301 else 302 return 0; 303 } 304 305 /* notifiers */ 306 static inline int 307 usb_register_notifier(struct usb_phy *x, struct notifier_block *nb) 308 { 309 return atomic_notifier_chain_register(&x->notifier, nb); 310 } 311 312 static inline void 313 usb_unregister_notifier(struct usb_phy *x, struct notifier_block *nb) 314 { 315 atomic_notifier_chain_unregister(&x->notifier, nb); 316 } 317 318 static inline const char *usb_phy_type_string(enum usb_phy_type type) 319 { 320 switch (type) { 321 case USB_PHY_TYPE_USB2: 322 return "USB2 PHY"; 323 case USB_PHY_TYPE_USB3: 324 return "USB3 PHY"; 325 default: 326 return "UNKNOWN PHY TYPE"; 327 } 328 } 329 #endif /* __LINUX_USB_PHY_H */ 330