media: rc: if kernel is built without an IR codec, don't advertise it

If the kernel is built without e.g. the imon IR decoder, the protocols
sysfs file still show the protocol as available. If user-space tries to
enable this decoder, the kernel will report an error:

$ echo +imon > /sys/class/rc/rc0/protocols
[   57.693033] rc_core: Loaded IR protocol module ir-imon-decoder, but protocol imon still not available

Ensuring that unavailable protocols are not advertised, ensures that
users space knows it is not available, and a BPF based IR decoder can be
loaded instead.

This supports the case when no kernel-based codec needs to be compiled in,
and every IR decoder can be BPF based.
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

include/media/rc-map.h

@@ -41,36 +41,85 @@
 #define RC_PROTO_BIT_RCMM32		BIT_ULL(RC_PROTO_RCMM32)
 #define RC_PROTO_BIT_XBOX_DVD		BIT_ULL(RC_PROTO_XBOX_DVD)
 
-/* All rc protocols for which we have decoders */
+#if IS_ENABLED(CONFIG_IR_RC5_DECODER)
+#define __RC_PROTO_RC5_CODEC \
+	(RC_PROTO_BIT_RC5 | RC_PROTO_BIT_RC5X_20 |  RC_PROTO_BIT_RC5_SZ)
+#else
+#define __RC_PROTO_RC5_CODEC 0
+#endif
+
+#if IS_ENABLED(CONFIG_IR_JVC_DECODER)
+#define __RC_PROTO_JVC_CODEC RC_PROTO_BIT_JVC
+#else
+#define __RC_PROTO_JVC_CODEC 0
+#endif
+#if IS_ENABLED(CONFIG_IR_SONY_DECODER)
+#define __RC_PROTO_SONY_CODEC \
+	(RC_PROTO_BIT_SONY12 | RC_PROTO_BIT_SONY15 |  RC_PROTO_BIT_SONY20)
+#else
+#define __RC_PROTO_SONY_CODEC 0
+#endif
+#if IS_ENABLED(CONFIG_IR_NEC_DECODER)
+#define __RC_PROTO_NEC_CODEC \
+	(RC_PROTO_BIT_NEC | RC_PROTO_BIT_NECX | RC_PROTO_BIT_NEC32)
+#else
+#define __RC_PROTO_NEC_CODEC 0
+#endif
+#if IS_ENABLED(CONFIG_IR_SANYO_DECODER)
+#define __RC_PROTO_SANYO_CODEC RC_PROTO_BIT_SANYO
+#else
+#define __RC_PROTO_SANYO_CODEC 0
+#endif
+#if IS_ENABLED(CONFIG_IR_MCE_KBD_DECODER)
+#define __RC_PROTO_MCE_KBD_CODEC \
+	(RC_PROTO_BIT_MCIR2_KBD |  RC_PROTO_BIT_MCIR2_MSE)
+#else
+#define __RC_PROTO_MCE_KBD_CODEC 0
+#endif
+#if IS_ENABLED(CONFIG_IR_RC6_DECODER)
+#define __RC_PROTO_RC6_CODEC \
+	(RC_PROTO_BIT_RC6_0 | RC_PROTO_BIT_RC6_6A_20 | \
+	 RC_PROTO_BIT_RC6_6A_24 |  RC_PROTO_BIT_RC6_6A_32 | \
+	 RC_PROTO_BIT_RC6_MCE)
+#else
+#define __RC_PROTO_RC6_CODEC 0
+#endif
+#if IS_ENABLED(CONFIG_IR_SHARP_DECODER)
+#define __RC_PROTO_SHARP_CODEC RC_PROTO_BIT_SHARP
+#else
+#define __RC_PROTO_SHARP_CODEC 0
+#endif
+#if IS_ENABLED(CONFIG_IR_XMP_DECODER)
+#define __RC_PROTO_XMP_CODEC RC_PROTO_BIT_XMP
+#else
+#define __RC_PROTO_XMP_CODEC 0
+#endif
+#if IS_ENABLED(CONFIG_IR_IMON_DECODER)
+#define __RC_PROTO_IMON_CODEC RC_PROTO_BIT_IMON
+#else
+#define __RC_PROTO_IMON_CODEC 0
+#endif
+#if IS_ENABLED(CONFIG_IR_RCMM_DECODER)
+#define __RC_PROTO_RCMM_CODEC \
+	(RC_PROTO_BIT_RCMM12 | RC_PROTO_BIT_RCMM24 | RC_PROTO_BIT_RCMM32)
+#else
+#define __RC_PROTO_RCMM_CODEC 0
+#endif
+
+/* All kernel-based codecs have encoders and decoders */
 #define RC_PROTO_BIT_ALL_IR_DECODER \
-			(RC_PROTO_BIT_RC5 | RC_PROTO_BIT_RC5X_20 | \
-			 RC_PROTO_BIT_RC5_SZ | RC_PROTO_BIT_JVC | \
-			 RC_PROTO_BIT_SONY12 | RC_PROTO_BIT_SONY15 | \
-			 RC_PROTO_BIT_SONY20 | RC_PROTO_BIT_NEC | \
-			 RC_PROTO_BIT_NECX | RC_PROTO_BIT_NEC32 | \
-			 RC_PROTO_BIT_SANYO | RC_PROTO_BIT_MCIR2_KBD | \
-			 RC_PROTO_BIT_MCIR2_MSE | \
-			 RC_PROTO_BIT_RC6_0 | RC_PROTO_BIT_RC6_6A_20 | \
-			 RC_PROTO_BIT_RC6_6A_24 |  RC_PROTO_BIT_RC6_6A_32 | \
-			 RC_PROTO_BIT_RC6_MCE | RC_PROTO_BIT_SHARP | \
-			 RC_PROTO_BIT_XMP | RC_PROTO_BIT_IMON | \
-			 RC_PROTO_BIT_RCMM12 | RC_PROTO_BIT_RCMM24 | \
-			 RC_PROTO_BIT_RCMM32)
+	(__RC_PROTO_RC5_CODEC | __RC_PROTO_JVC_CODEC | __RC_PROTO_SONY_CODEC | \
+	 __RC_PROTO_NEC_CODEC | __RC_PROTO_SANYO_CODEC | \
+	 __RC_PROTO_MCE_KBD_CODEC | __RC_PROTO_RC6_CODEC | \
+	 __RC_PROTO_SHARP_CODEC | __RC_PROTO_XMP_CODEC | \
+	 __RC_PROTO_IMON_CODEC | __RC_PROTO_RCMM_CODEC)
 
 #define RC_PROTO_BIT_ALL_IR_ENCODER \
-			(RC_PROTO_BIT_RC5 | RC_PROTO_BIT_RC5X_20 | \
-			 RC_PROTO_BIT_RC5_SZ | RC_PROTO_BIT_JVC | \
-			 RC_PROTO_BIT_SONY12 | RC_PROTO_BIT_SONY15 | \
-			 RC_PROTO_BIT_SONY20 |  RC_PROTO_BIT_NEC | \
-			 RC_PROTO_BIT_NECX | RC_PROTO_BIT_NEC32 | \
-			 RC_PROTO_BIT_SANYO | RC_PROTO_BIT_MCIR2_KBD | \
-			 RC_PROTO_BIT_MCIR2_MSE | \
-			 RC_PROTO_BIT_RC6_0 | RC_PROTO_BIT_RC6_6A_20 | \
-			 RC_PROTO_BIT_RC6_6A_24 | \
-			 RC_PROTO_BIT_RC6_6A_32 | RC_PROTO_BIT_RC6_MCE | \
-			 RC_PROTO_BIT_SHARP | RC_PROTO_BIT_IMON | \
-			 RC_PROTO_BIT_RCMM12 | RC_PROTO_BIT_RCMM24 | \
-			 RC_PROTO_BIT_RCMM32)
+	(__RC_PROTO_RC5_CODEC | __RC_PROTO_JVC_CODEC | __RC_PROTO_SONY_CODEC | \
+	 __RC_PROTO_NEC_CODEC | __RC_PROTO_SANYO_CODEC | \
+	 __RC_PROTO_MCE_KBD_CODEC | __RC_PROTO_RC6_CODEC | \
+	 __RC_PROTO_SHARP_CODEC | __RC_PROTO_XMP_CODEC | \
+	 __RC_PROTO_IMON_CODEC | __RC_PROTO_RCMM_CODEC)
 
 #define RC_SCANCODE_UNKNOWN(x)			(x)
 #define RC_SCANCODE_OTHER(x)			(x)