include/linux/usb/phy.h

   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 */