V4L/DVB (5741): Tuner: add release callback

Individual tuner drivers are now allocating memory themselves for
their own private data structures.  This changeset adds a release
callback to the tuner operations, so that newer drivers that may
require more complex data structures may release this private data
themselves.

Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

2 files changed, 6 insertions, 0 deletions

diff --git a/drivers/media/video/tuner-core.c b/drivers/media/video/tuner-core.c
index 4369f6d12499..0e71a22f1d4f 100644
--- a/drivers/media/video/tuner-core.c
+++ b/drivers/media/video/tuner-core.c
@@ -178,8 +178,11 @@ static void set_type(struct i2c_client *c, unsigned int type,
         }
 
         /* discard private data, in case set_type() was previously called */
+        if (t->release)
+                t->release(c);
         kfree(t->priv);
         t->priv = NULL;
+
         switch (t->type) {
         case TUNER_MT2032:
                 microtune_init(c);
@@ -561,6 +564,8 @@ static int tuner_detach(struct i2c_client *client)
                 return err;
         }
 
+        if (t->release)
+                t->release(client);
         kfree(t->priv);
         kfree(t);
         return 0;
diff --git a/include/media/tuner.h b/include/media/tuner.h
index b901373c6e10..da821a027e76 100644
--- a/include/media/tuner.h
+++ b/include/media/tuner.h
@@ -215,6 +215,7 @@ struct tuner {
         int  (*get_afc)(struct i2c_client *c);
         void (*tuner_status)(struct i2c_client *c);
         void (*standby)(struct i2c_client *c);
+        void (*release)(struct i2c_client *c);
 };
 
 extern unsigned const int tuner_count;