From d995506062c974133ba66d0822e58a923d4d74d9 Mon Sep 17 00:00:00 2001
From: Andrew de Quincey <adq_dvb@lidskialf.net>
Date: Tue, 8 Aug 2006 09:10:08 -0300
Subject: V4L/DVB (4385): Add dvb_attach() macro and supporting routines

Add dvb_attach() macro and supporting routines

Signed-off-by: Andrew de Quincey <adq_dvb@lidskialf.net>
Acked-by: Michael Krufky <mkrufky@linuxtv.org>
Acked-by: Trent Piepho <xyzzy@speakeasy.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
---
 drivers/media/dvb/dvb-core/dvbdev.h | 40 +++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

(limited to 'drivers/media/dvb/dvb-core/dvbdev.h')

diff --git a/drivers/media/dvb/dvb-core/dvbdev.h b/drivers/media/dvb/dvb-core/dvbdev.h
index 7a7f75f..66d91e5 100644
--- a/drivers/media/dvb/dvb-core/dvbdev.h
+++ b/drivers/media/dvb/dvb-core/dvbdev.h
@@ -102,4 +102,44 @@ extern int dvb_usercopy(struct inode *inode, struct file *file,
 			    int (*func)(struct inode *inode, struct file *file,
 			    unsigned int cmd, void *arg));
 
+
+/** generic DVB attach function. */
+#ifdef CONFIG_DVB_CORE_ATTACH
+#define dvb_attach(FUNCTION, ARGS...) ({ \
+	void *__r = NULL; \
+	typeof(&FUNCTION) __a = symbol_request(FUNCTION); \
+	if (__a) { \
+		__r = (void *) __a(ARGS); \
+		if (__r == NULL) \
+			symbol_put(FUNCTION); \
+	} else { \
+		printk(KERN_ERR "DVB: Unable to find symbol "#FUNCTION"()\n"); \
+	} \
+	__r; \
+})
+
+#define dvb_detach(FUNCPTR, ARGS...) ({ \
+	typeof((FUNCPTR)) __funcptrtmp = FUNCPTR; \
+	if (__funcptrtmp) { \
+		__funcptrtmp(ARGS); \
+		symbol_put_addr(__funcptrtmp); \
+	} \
+	FUNCPTR = NULL; \
+})
+
+#else
+#define dvb_attach(FUNCTION, ARGS...) ({ \
+	FUNCTION(ARGS); \
+})
+
+#define dvb_detach(FUNCPTR, ARGS...) \
+do { \
+	if (FUNCPTR) \
+		FUNCPTR(ARGS); \
+	FUNCPTR = NULL; \
+} while(0)
+
+#endif
+
+
 #endif /* #ifndef _DVBDEV_H_ */
-- 
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