V4L/DVB (7470): CX24123: preparing support for CX24113 tuner

To support a new device based on CX24123 (using the CX24113-tuner) the following was done:

- added two parameters to de-select the internal PLL-driver (for CX24108) and a AGC-function callback.
- added a virtual i2c-adapter which allow simple access behind the i2c-gate
- cleanup up some code
Signed-off-by: NPatrick Boettcher <pb@linuxtv.org>
Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/dvb/frontends/cx24123.h

@@ -33,16 +33,27 @@ struct cx24123_config
 
 	/* 0 = LNB voltage normal, 1 = LNB voltage inverted */
 	int lnb_polarity;
+
+	/* this device has another tuner */
+	u8 dont_use_pll;
+	void (*agc_callback) (struct dvb_frontend *);
 };
 
 #if defined(CONFIG_DVB_CX24123) || (defined(CONFIG_DVB_CX24123_MODULE) && defined(MODULE))
-extern struct dvb_frontend* cx24123_attach(const struct cx24123_config* config,
-					   struct i2c_adapter* i2c);
+extern struct dvb_frontend *cx24123_attach(const struct cx24123_config *config,
+					   struct i2c_adapter *i2c);
+extern struct i2c_adapter *cx24123_get_tuner_i2c_adapter(struct dvb_frontend *);
 #else
-static inline struct dvb_frontend* cx24123_attach(const struct cx24123_config* config,
-						  struct i2c_adapter* i2c)
+static inline struct dvb_frontend *cx24123_attach(
+	const struct cx24123_config *config, struct i2c_adapter *i2c)
+{
+	printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
+	return NULL;
+}
+static struct i2c_adapter *
+	cx24123_get_tuner_i2c_adapter(struct dvb_frontend *fe)
 {
-	printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __FUNCTION__);
+	printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
 	return NULL;
 }
 #endif // CONFIG_DVB_CX24123