V4L/DVB (5742): Tuner: define release callback for mt20xx, tda9887 and tda8290

Define tuner release callbacks for mt20xx, tda9887 and tda8290, so that
these drivers can release their own private structures themselves.
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/mt20xx.c

@@ -495,6 +495,14 @@ static int mt2050_init(struct i2c_client *c)
 	return 0;
 }
 
+static void microtune_release(struct i2c_client *c)
+{
+	struct tuner *t = i2c_get_clientdata(c);
+
+	kfree(t->priv);
+	t->priv = NULL;
+}
+
 int microtune_init(struct i2c_client *c)
 {
 	struct microtune_priv *priv = NULL;
@@ -514,6 +522,7 @@ int microtune_init(struct i2c_client *c)
 	t->set_tv_freq    = NULL;
 	t->set_radio_freq = NULL;
 	t->standby    = NULL;
+	t->release        = microtune_release;
 	if (t->std & V4L2_STD_525_60) {
 		tuner_dbg("pinnacle ntsc\n");
 		priv->radio_if2 = 41300 * 1000;

drivers/media/video/tda8290.c

@@ -595,6 +595,14 @@ static void tda8290_init_tuner(struct i2c_client *c)
 
 /*---------------------------------------------------------------------*/
 
+static void tda8290_release(struct i2c_client *c)
+{
+	struct tuner *t = i2c_get_clientdata(c);
+
+	kfree(t->priv);
+	t->priv = NULL;
+}
+
 int tda8290_init(struct i2c_client *c)
 {
 	struct tda8290_priv *priv = NULL;
@@ -663,6 +671,7 @@ int tda8290_init(struct i2c_client *c)
 	t->set_radio_freq = set_radio_freq;
 	t->has_signal = has_signal;
 	t->standby = standby;
+	t->release = tda8290_release;
 	priv->tda827x_lpsel = 0;
 	t->mode = V4L2_TUNER_ANALOG_TV;
 

drivers/media/video/tda9887.c

@@ -591,6 +591,14 @@ static void tda9887_set_freq(struct i2c_client *client, unsigned int freq)
 	tda9887_configure(client);
 }
 
+static void tda9887_release(struct i2c_client *c)
+{
+	struct tuner *t = i2c_get_clientdata(c);
+
+	kfree(t->priv);
+	t->priv = NULL;
+}
+
 int tda9887_tuner_init(struct i2c_client *c)
 {
 	struct tda9887_priv *priv = NULL;
@@ -611,6 +619,7 @@ int tda9887_tuner_init(struct i2c_client *c)
 	t->standby = tda9887_standby;
 	t->tuner_status = tda9887_tuner_status;
 	t->get_afc = tda9887_get_afc;
+	t->release = tda9887_release;
 
 	return 0;
 }