1 files changed, 106 insertions, 1 deletions

diff --git a/include/linux/usb/otg.h b/include/linux/usb/otg.h
index 2443c0e7a80c..a1a1e7a73ec9 100644
--- a/include/linux/usb/otg.h
+++ b/include/linux/usb/otg.h
@@ -9,6 +9,8 @@
 #ifndef __LINUX_USB_OTG_H
 #define __LINUX_USB_OTG_H
 
+#include <linux/notifier.h>
+
 /* OTG defines lots of enumeration states before device reset */
 enum usb_otg_state {
 	OTG_STATE_UNDEFINED = 0,
@@ -33,6 +35,24 @@ enum usb_otg_state {
 	OTG_STATE_A_VBUS_ERR,
 };
 
+enum usb_xceiv_events {
+	USB_EVENT_NONE,         /* no events or cable disconnected */
+	USB_EVENT_VBUS,         /* vbus valid event */
+	USB_EVENT_ID,           /* id was grounded */
+	USB_EVENT_CHARGER,      /* usb dedicated charger */
+	USB_EVENT_ENUMERATED,   /* gadget driver enumerated */
+};
+
+struct otg_transceiver;
+
+/* for transceivers connected thru an ULPI interface, the user must
+ * provide access ops
+ */
+struct otg_io_access_ops {
+	int (*read)(struct otg_transceiver *otg, u32 reg);
+	int (*write)(struct otg_transceiver *otg, u32 val, u32 reg);
+};
+
 /*
  * the otg driver needs to interact with both device side and host side
  * usb controllers.  it decides which controller is active at a given
@@ -42,6 +62,7 @@ enum usb_otg_state {
 struct otg_transceiver {
 	struct device		*dev;
 	const char		*label;
+	unsigned int		 flags;
 
 	u8			default_a;
 	enum usb_otg_state	state;
@@ -49,10 +70,20 @@ struct otg_transceiver {
 	struct usb_bus		*host;
 	struct usb_gadget	*gadget;
 
+	struct otg_io_access_ops	*io_ops;
+	void __iomem			*io_priv;
+
+	/* for notification of usb_xceiv_events */
+	struct blocking_notifier_head	notifier;
+
 	/* to pass extra port status to the root hub */
 	u16			port_status;
 	u16			port_change;
 
+	/* initialize/shutdown the OTG controller */
+	int	(*init)(struct otg_transceiver *otg);
+	void	(*shutdown)(struct otg_transceiver *otg);
+
 	/* bind/unbind the host controller */
 	int	(*set_host)(struct otg_transceiver *otg,
 				struct usb_bus *host);
@@ -65,6 +96,10 @@ struct otg_transceiver {
 	int	(*set_power)(struct otg_transceiver *otg,
 				unsigned mA);
 
+	/* effective for A-peripheral, ignored for B devices */
+	int	(*set_vbus)(struct otg_transceiver *otg,
+				bool enabled);
+
 	/* for non-OTG B devices: set transceiver into suspend mode */
 	int	(*set_suspend)(struct otg_transceiver *otg,
 				int suspend);
@@ -81,14 +116,67 @@ struct otg_transceiver {
 /* for board-specific init logic */
 extern int otg_set_transceiver(struct otg_transceiver *);
 
+#if defined(CONFIG_NOP_USB_XCEIV) || (defined(CONFIG_NOP_USB_XCEIV_MODULE) && defined(MODULE))
 /* sometimes transceivers are accessed only through e.g. ULPI */
 extern void usb_nop_xceiv_register(void);
 extern void usb_nop_xceiv_unregister(void);
+#else
+static inline void usb_nop_xceiv_register(void)
+{
+}
+
+static inline void usb_nop_xceiv_unregister(void)
+{
+}
+#endif
+
+/* helpers for direct access thru low-level io interface */
+static inline int otg_io_read(struct otg_transceiver *otg, u32 reg)
+{
+	if (otg->io_ops && otg->io_ops->read)
+		return otg->io_ops->read(otg, reg);
 
+	return -EINVAL;
+}
+
+static inline int otg_io_write(struct otg_transceiver *otg, u32 val, u32 reg)
+{
+	if (otg->io_ops && otg->io_ops->write)
+		return otg->io_ops->write(otg, val, reg);
+
+	return -EINVAL;
+}
+
+static inline int
+otg_init(struct otg_transceiver *otg)
+{
+	if (otg->init)
+		return otg->init(otg);
+
+	return 0;
+}
+
+static inline void
+otg_shutdown(struct otg_transceiver *otg)
+{
+	if (otg->shutdown)
+		otg->shutdown(otg);
+}
 
 /* for usb host and peripheral controller drivers */
+#ifdef CONFIG_USB_OTG_UTILS
 extern struct otg_transceiver *otg_get_transceiver(void);
 extern void otg_put_transceiver(struct otg_transceiver *);
+#else
+static inline struct otg_transceiver *otg_get_transceiver(void)
+{
+	return NULL;
+}
+
+static inline void otg_put_transceiver(struct otg_transceiver *x)
+{
+}
+#endif
 
 /* Context: can sleep */
 static inline int
@@ -97,6 +185,12 @@ otg_start_hnp(struct otg_transceiver *otg)
 	return otg->start_hnp(otg);
 }
 
+/* Context: can sleep */
+static inline int
+otg_set_vbus(struct otg_transceiver *otg, bool enabled)
+{
+	return otg->set_vbus(otg, enabled);
+}
 
 /* for HCDs */
 static inline int
@@ -105,7 +199,6 @@ otg_set_host(struct otg_transceiver *otg, struct usb_bus *host)
 	return otg->set_host(otg, host);
 }
 
-
 /* for usb peripheral controller drivers */
 
 /* Context: can sleep */
@@ -137,6 +230,18 @@ otg_start_srp(struct otg_transceiver *otg)
 	return otg->start_srp(otg);
 }
 
+/* notifiers */
+static inline int
+otg_register_notifier(struct otg_transceiver *otg, struct notifier_block *nb)
+{
+	return blocking_notifier_chain_register(&otg->notifier, nb);
+}
+
+static inline void
+otg_unregister_notifier(struct otg_transceiver *otg, struct notifier_block *nb)
+{
+	blocking_notifier_chain_unregister(&otg->notifier, nb);
+}
 
 /* for OTG controller drivers (and maybe other stuff) */
 extern int usb_bus_start_enum(struct usb_bus *bus, unsigned port_num);