1 files changed, 118 insertions, 0 deletions
diff --git a/include/linux/usb_otg.h b/include/linux/usb_otg.h
new file mode 100644
index 000000000000..c6683146e9b0
--- /dev/null
+++ b/include/linux/usb_otg.h
@@ -0,0 +1,118 @@
+// 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);