f6d92a05c8
NOP transceiver is used by all the usb transceiver which are mostly autonomous and doesn't require any programming or which are built into the usb ip itself.NOP transceiver only allocates the memory for struct xceiv and calls otg_set_transceiver() so function call to otg_get_transceiver() will return a valid transceiver. NOP transceiver device should be registered by calling usb_nop_xceiv_register() from platform files. Signed-off-by: Ajay Kumar Gupta <ajay.gupta@ti.com> Cc: Felipe Balbi <felipe.balbi@nokia.com> Cc: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
144 lines
3.4 KiB
C
144 lines
3.4 KiB
C
/* USB OTG (On The Go) defines */
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/*
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*
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* These APIs may be used between USB controllers. USB device drivers
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* (for either host or peripheral roles) don't use these calls; they
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* continue to use just usb_device and usb_gadget.
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*/
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#ifndef __LINUX_USB_OTG_H
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#define __LINUX_USB_OTG_H
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/* OTG defines lots of enumeration states before device reset */
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enum usb_otg_state {
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OTG_STATE_UNDEFINED = 0,
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/* single-role peripheral, and dual-role default-b */
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OTG_STATE_B_IDLE,
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OTG_STATE_B_SRP_INIT,
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OTG_STATE_B_PERIPHERAL,
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/* extra dual-role default-b states */
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OTG_STATE_B_WAIT_ACON,
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OTG_STATE_B_HOST,
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/* dual-role default-a */
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OTG_STATE_A_IDLE,
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OTG_STATE_A_WAIT_VRISE,
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OTG_STATE_A_WAIT_BCON,
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OTG_STATE_A_HOST,
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OTG_STATE_A_SUSPEND,
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OTG_STATE_A_PERIPHERAL,
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OTG_STATE_A_WAIT_VFALL,
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OTG_STATE_A_VBUS_ERR,
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};
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/*
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* the otg driver needs to interact with both device side and host side
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* usb controllers. it decides which controller is active at a given
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* moment, using the transceiver, ID signal, HNP and sometimes static
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* configuration information (including "board isn't wired for otg").
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*/
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struct otg_transceiver {
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struct device *dev;
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const char *label;
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u8 default_a;
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enum usb_otg_state state;
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struct usb_bus *host;
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struct usb_gadget *gadget;
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/* to pass extra port status to the root hub */
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u16 port_status;
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u16 port_change;
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/* bind/unbind the host controller */
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int (*set_host)(struct otg_transceiver *otg,
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struct usb_bus *host);
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/* bind/unbind the peripheral controller */
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int (*set_peripheral)(struct otg_transceiver *otg,
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struct usb_gadget *gadget);
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/* effective for B devices, ignored for A-peripheral */
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int (*set_power)(struct otg_transceiver *otg,
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unsigned mA);
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/* for non-OTG B devices: set transceiver into suspend mode */
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int (*set_suspend)(struct otg_transceiver *otg,
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int suspend);
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/* for B devices only: start session with A-Host */
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int (*start_srp)(struct otg_transceiver *otg);
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/* start or continue HNP role switch */
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int (*start_hnp)(struct otg_transceiver *otg);
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};
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/* for board-specific init logic */
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extern int otg_set_transceiver(struct otg_transceiver *);
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#ifdef CONFIG_NOP_USB_XCEIV
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extern void usb_nop_xceiv_register(void);
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extern void usb_nop_xceiv_unregister(void);
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#endif
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/* for usb host and peripheral controller drivers */
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extern struct otg_transceiver *otg_get_transceiver(void);
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extern void otg_put_transceiver(struct otg_transceiver *);
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/* Context: can sleep */
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static inline int
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otg_start_hnp(struct otg_transceiver *otg)
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{
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return otg->start_hnp(otg);
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}
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/* for HCDs */
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static inline int
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otg_set_host(struct otg_transceiver *otg, struct usb_bus *host)
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{
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return otg->set_host(otg, host);
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}
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/* for usb peripheral controller drivers */
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/* Context: can sleep */
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static inline int
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otg_set_peripheral(struct otg_transceiver *otg, struct usb_gadget *periph)
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{
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return otg->set_peripheral(otg, periph);
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}
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static inline int
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otg_set_power(struct otg_transceiver *otg, unsigned mA)
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{
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return otg->set_power(otg, mA);
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}
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/* Context: can sleep */
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static inline int
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otg_set_suspend(struct otg_transceiver *otg, int suspend)
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{
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if (otg->set_suspend != NULL)
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return otg->set_suspend(otg, suspend);
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else
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return 0;
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}
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static inline int
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otg_start_srp(struct otg_transceiver *otg)
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{
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return otg->start_srp(otg);
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}
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/* for OTG controller drivers (and maybe other stuff) */
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extern int usb_bus_start_enum(struct usb_bus *bus, unsigned port_num);
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#endif /* __LINUX_USB_OTG_H */
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