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-rw-r--r--include/linux/usb_otg.h118
1 files changed, 118 insertions, 0 deletions
diff --git a/include/linux/usb_otg.h b/include/linux/usb_otg.h
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index 0000000..c668314
--- /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);
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