usb_otg.h
上传用户:szlgq88
上传日期:2009-04-28
资源大小:48287k
文件大小:3k
- // include/linux/usb_otg.h
- /*
- * These APIs may be used between USB controllers. USB device drivers
- * (for either host or peripheral roles) don't use these calls; they
- * continue to use just usb_device and usb_gadget.
- */
- /* OTG defines lots of enumeration states before device reset */
- enum usb_otg_state {
- OTG_STATE_UNDEFINED = 0,
- /* single-role peripheral, and dual-role default-b */
- OTG_STATE_B_IDLE,
- OTG_STATE_B_SRP_INIT,
- OTG_STATE_B_PERIPHERAL,
- /* extra dual-role default-b states */
- OTG_STATE_B_WAIT_ACON,
- OTG_STATE_B_HOST,
- /* dual-role default-a */
- OTG_STATE_A_IDLE,
- OTG_STATE_A_WAIT_VRISE,
- OTG_STATE_A_WAIT_BCON,
- OTG_STATE_A_HOST,
- OTG_STATE_A_SUSPEND,
- OTG_STATE_A_PERIPHERAL,
- OTG_STATE_A_WAIT_VFALL,
- OTG_STATE_A_VBUS_ERR,
- };
- /*
- * the otg driver needs to interact with both device side and host side
- * usb controllers. it decides which controller is active at a given
- * moment, using the transceiver, ID signal, HNP and sometimes static
- * configuration information (including "board isn't wired for otg").
- */
- struct otg_transceiver {
- struct device *dev;
- const char *label;
- u8 default_a;
- enum usb_otg_state state;
- struct usb_bus *host;
- struct usb_gadget *gadget;
- /* to pass extra port status to the root hub */
- u16 port_status;
- u16 port_change;
- /* bind/unbind the host controller */
- int (*set_host)(struct otg_transceiver *otg,
- struct usb_bus *host);
- /* bind/unbind the peripheral controller */
- int (*set_peripheral)(struct otg_transceiver *otg,
- struct usb_gadget *gadget);
- /* effective for B devices, ignored for A-peripheral */
- int (*set_power)(struct otg_transceiver *otg,
- unsigned mA);
- /* for B devices only: start session with A-Host */
- int (*start_srp)(struct otg_transceiver *otg);
- /* start or continue HNP role switch */
- int (*start_hnp)(struct otg_transceiver *otg);
- };
- /* for board-specific init logic */
- extern int otg_set_transceiver(struct otg_transceiver *);
- /* for usb host and peripheral controller drivers */
- extern struct otg_transceiver *otg_get_transceiver(void);
- static inline int
- otg_start_hnp(struct otg_transceiver *otg)
- {
- return otg->start_hnp(otg);
- }
- /* for HCDs */
- static inline int
- otg_set_host(struct otg_transceiver *otg, struct usb_bus *host)
- {
- return otg->set_host(otg, host);
- }
- /* for usb peripheral controller drivers */
- static inline int
- otg_set_peripheral(struct otg_transceiver *otg, struct usb_gadget *periph)
- {
- return otg->set_peripheral(otg, periph);
- }
- static inline int
- otg_set_power(struct otg_transceiver *otg, unsigned mA)
- {
- return otg->set_power(otg, mA);
- }
- static inline int
- otg_start_srp(struct otg_transceiver *otg)
- {
- return otg->start_srp(otg);
- }
- /* for OTG controller drivers (and maybe other stuff) */
- extern int usb_bus_start_enum(struct usb_bus *bus, unsigned port_num);