usb: musb: add Kconfig options for HOST, GAGDET or DUAL_ROLE modes

This makes building the actual object files optional to the selected
mode, which saves users who know which kind of USB mode support they
need some binary size.

Unimplemented functions are stubbed out with static inline functions.

Signed-off-by: Daniel Mack <zonque@gmail.com>
Acked-by: Peter Korsgaard <jacmet@sunsite.dk>
Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --git a/drivers/usb/musb/Kconfig b/drivers/usb/musb/Kconfig
index 06f8d29af1ef7a74dfb0d2c0ae61ea58e36e2a74..797e3fd455102b5365d4730db5659fce1f2ded43 100644 (file)
--- a/drivers/usb/musb/Kconfig
+++ b/drivers/usb/musb/Kconfig
@@ -27,6 +27,35 @@ config USB_MUSB_HDRC
 
 if USB_MUSB_HDRC
 
+choice
+       bool "MUSB Mode Selection"
+       default USB_MUSB_DUAL_ROLE if (USB && USB_GADGET)
+       default USB_MUSB_HOST if (USB && !USB_GADGET)
+       default USB_MUSB_GADGET if (!USB && USB_GADGET)
+
+config USB_MUSB_HOST
+       bool "Host only mode"
+       depends on USB
+       help
+         Select this when you want to use MUSB in host mode only,
+         thereby the gadget feature will be regressed.
+
+config USB_MUSB_GADGET
+       bool "Gadget only mode"
+       depends on USB_GADGET
+       help
+         Select this when you want to use MUSB in gadget mode only,
+         thereby the host feature will be regressed.
+
+config USB_MUSB_DUAL_ROLE
+       bool "Dual Role mode"
+       depends on (USB && USB_GADGET)
+       help
+         This is the default mode of working of MUSB controller where
+         both host and gadget features are enabled.
+
+endchoice
+
 choice
        prompt "Platform Glue Layer"
 

diff --git a/drivers/usb/musb/Makefile b/drivers/usb/musb/Makefile
index 3b858715b5eaa9808a7b1ac179e7396981943619..2b82ed7c85ca9baa0498d1dabd7a2aeca6b59e27 100644 (file)
--- a/drivers/usb/musb/Makefile
+++ b/drivers/usb/musb/Makefile
@@ -6,8 +6,8 @@ obj-$(CONFIG_USB_MUSB_HDRC) += musb_hdrc.o
 
 musb_hdrc-y := musb_core.o
 
-musb_hdrc-y                                    += musb_gadget_ep0.o musb_gadget.o
-musb_hdrc-y                                    += musb_virthub.o musb_host.o
+musb_hdrc-$(CONFIG_USB_MUSB_HOST)$(CONFIG_USB_MUSB_DUAL_ROLE) += musb_virthub.o musb_host.o
+musb_hdrc-$(CONFIG_USB_MUSB_GADGET)$(CONFIG_USB_MUSB_DUAL_ROLE) += musb_gadget_ep0.o musb_gadget.o
 musb_hdrc-$(CONFIG_DEBUG_FS)                   += musb_debugfs.o
 
 # Hardware Glue Layer

diff --git a/drivers/usb/musb/musb_gadget.h b/drivers/usb/musb/musb_gadget.h
index 75f821cc3d98afb8c32de546fd3e333f259f2cb4..0314dfc770c7e55a7483637ee07e1dcf520b7b8d 100644 (file)
--- a/drivers/usb/musb/musb_gadget.h
+++ b/drivers/usb/musb/musb_gadget.h
@@ -37,6 +37,7 @@
 
 #include <linux/list.h>
 
+#if IS_ENABLED(CONFIG_USB_MUSB_GADGET) || IS_ENABLED(CONFIG_USB_MUSB_DUAL_ROLE)
 extern irqreturn_t musb_g_ep0_irq(struct musb *);
 extern void musb_g_tx(struct musb *, u8);
 extern void musb_g_rx(struct musb *, u8);
@@ -48,6 +49,26 @@ extern void musb_g_disconnect(struct musb *);
 extern void musb_gadget_cleanup(struct musb *);
 extern int musb_gadget_setup(struct musb *);
 
+#else
+static inline irqreturn_t musb_g_ep0_irq(struct musb *musb)
+{
+       return 0;
+}
+
+static inline void musb_g_tx(struct musb *musb, u8 epnum)      {}
+static inline void musb_g_rx(struct musb *musb, u8 epnum)      {}
+static inline void musb_g_reset(struct musb *musb)             {}
+static inline void musb_g_suspend(struct musb *musb)           {}
+static inline void musb_g_resume(struct musb *musb)            {}
+static inline void musb_g_wakeup(struct musb *musb)            {}
+static inline void musb_g_disconnect(struct musb *musb)                {}
+static inline void musb_gadget_cleanup(struct musb *musb)      {}
+static inline int musb_gadget_setup(struct musb *musb)
+{
+       return 0;
+}
+#endif
+
 enum buffer_map_state {
        UN_MAPPED = 0,
        PRE_MAPPED,

diff --git a/drivers/usb/musb/musb_host.h b/drivers/usb/musb/musb_host.h
index e47035e1e3c9a067cdeedb587cab30764b3a0226..1ce6e4ec9021bcb802c519af31bb19555159667d 100644 (file)
--- a/drivers/usb/musb/musb_host.h
+++ b/drivers/usb/musb/musb_host.h
@@ -39,8 +39,6 @@
 
 #define musb_to_hcd(MUSB) ((MUSB)->hcd)
 
-extern struct musb *hcd_to_musb(struct usb_hcd *);
-
 /* stored in "usb_host_endpoint.hcpriv" for scheduled endpoints */
 struct musb_qh {
        struct usb_host_endpoint *hep;          /* usbcore info */
@@ -78,6 +76,9 @@ static inline struct musb_qh *first_qh(struct list_head *q)
        return list_entry(q->next, struct musb_qh, ring);
 }
 
+
+#if IS_ENABLED(CONFIG_USB_MUSB_HOST) || IS_ENABLED(CONFIG_USB_MUSB_DUAL_ROLE)
+extern struct musb *hcd_to_musb(struct usb_hcd *);
 extern irqreturn_t musb_h_ep0_irq(struct musb *);
 extern int musb_host_alloc(struct musb *);
 extern void musb_host_tx(struct musb *, u8);
@@ -90,6 +91,30 @@ extern void musb_host_rx(struct musb *, u8);
 extern void musb_root_disconnect(struct musb *musb);
 extern void musb_host_resume_root_hub(struct musb *musb);
 extern void musb_host_poke_root_hub(struct musb *musb);
+#else
+static inline struct musb *hcd_to_musb(struct usb_hcd *hcd)
+{
+       return NULL;
+}
+
+static inline irqreturn_t musb_h_ep0_irq(struct musb *musb)
+{
+       return 0;
+}
+
+static inline int musb_host_alloc(struct musb *musb)
+{
+       return 0;
+}
+
+static inline void musb_host_free(struct musb *musb)           {}
+static inline void musb_host_tx(struct musb *musb, u8 epnum)   {}
+static inline void musb_host_rx(struct musb *musb, u8 epnum)   {}
+static inline void musb_root_disconnect(struct musb *musb)     {}
+static inline void musb_host_resume_root_hub(struct musb *musb)        {}
+static inline void musb_host_poll_rh_status(struct musb *musb) {}
+static inline void musb_host_poke_root_hub(struct musb *musb)  {}
+#endif
 
 struct usb_hcd;