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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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4e67185a7a
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>
132 lines
3.1 KiB
C
132 lines
3.1 KiB
C
// include/linux/usb_otg.h
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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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/* 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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/* for usb host and peripheral controller drivers */
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extern struct otg_transceiver *otg_get_transceiver(void);
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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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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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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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