kernel-ark/include/linux/usb_otg.h
Juha Yrj?l? 4e67185a7a [PATCH] add usb transceiver set_suspend() method
When a USB device is put into suspend mode, the current drawn from VBUS
has to be less than 500 uA. Some transceivers need to be put into a
special power-saving mode to accomplish this, and won't have a separate
OTG driver handling that.

This adds a suspend method to the "otg_transceiver" struct -- misnamed,
it's not only for OTG -- and calls it from the OMAP UDC driver.

Signed-off-by: Juha Yrj?l? <juha.yrjola@nokia.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2005-10-28 16:47:45 -07:00

132 lines
3.1 KiB
C

// 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 non-OTG B devices: set transceiver into suspend mode */
int (*set_suspend)(struct otg_transceiver *otg,
int suspend);
/* 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_set_suspend(struct otg_transceiver *otg, int suspend)
{
if (otg->set_suspend != NULL)
return otg->set_suspend(otg, suspend);
else
return 0;
}
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);