[media] dib8000: export just one symbol

Exporting multiple symbols don't work as it causes compilation
breakages, due to the way dvb_attach() works.

The bug happens when:
        CONFIG_DVB_DIB8000=m
	CONFIG_DVB_USB_DIB0700=y

As a bonus, dib8000 won't be loaded anymore if the device uses
a different frontend, reducing the memory footprint.

Tested with both Pixelview PV-D231 and MyGica S870.

Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
diff --git a/drivers/media/dvb-frontends/dib8000.h b/drivers/media/dvb-frontends/dib8000.h
index 89962d6..84cc103 100644
--- a/drivers/media/dvb-frontends/dib8000.h
+++ b/drivers/media/dvb-frontends/dib8000.h
@@ -39,134 +39,34 @@
 
 #define DEFAULT_DIB8000_I2C_ADDRESS 18
 
-#if IS_ENABLED(CONFIG_DVB_DIB8000)
-extern struct dvb_frontend *dib8000_init(struct i2c_adapter *i2c_adap, u8 i2c_addr, struct dib8000_config *cfg);
-extern struct i2c_adapter *dib8000_get_i2c_master(struct dvb_frontend *, enum dibx000_i2c_interface, int);
-
-extern int dib8000_i2c_enumeration(struct i2c_adapter *host, int no_of_demods,
-		u8 default_addr, u8 first_addr, u8 is_dib8096p);
-
-extern int dib8000_set_gpio(struct dvb_frontend *, u8 num, u8 dir, u8 val);
-extern int dib8000_set_wbd_ref(struct dvb_frontend *, u16 value);
-extern int dib8000_pid_filter_ctrl(struct dvb_frontend *, u8 onoff);
-extern int dib8000_pid_filter(struct dvb_frontend *, u8 id, u16 pid, u8 onoff);
-extern int dib8000_set_tune_state(struct dvb_frontend *fe, enum frontend_tune_state tune_state);
-extern enum frontend_tune_state dib8000_get_tune_state(struct dvb_frontend *fe);
-extern void dib8000_pwm_agc_reset(struct dvb_frontend *fe);
-extern s32 dib8000_get_adc_power(struct dvb_frontend *fe, u8 mode);
-extern struct i2c_adapter *dib8096p_get_i2c_tuner(struct dvb_frontend *fe);
-extern int dib8096p_tuner_sleep(struct dvb_frontend *fe, int onoff);
-extern int dib8090p_get_dc_power(struct dvb_frontend *fe, u8 IQ);
-extern u32 dib8000_ctrl_timf(struct dvb_frontend *fe,
-		uint8_t op, uint32_t timf);
-extern int dib8000_update_pll(struct dvb_frontend *fe,
+struct dib8000_ops {
+	int (*set_wbd_ref)(struct dvb_frontend *fe, u16 value);
+	int (*update_pll)(struct dvb_frontend *fe,
 		struct dibx000_bandwidth_config *pll, u32 bw, u8 ratio);
-extern int dib8000_set_slave_frontend(struct dvb_frontend *fe, struct dvb_frontend *fe_slave);
-extern int dib8000_remove_slave_frontend(struct dvb_frontend *fe);
-extern struct dvb_frontend *dib8000_get_slave_frontend(struct dvb_frontend *fe, int slave_index);
+	int (*set_gpio)(struct dvb_frontend *fe, u8 num, u8 dir, u8 val);
+	void (*pwm_agc_reset)(struct dvb_frontend *fe);
+	struct i2c_adapter *(*get_i2c_tuner)(struct dvb_frontend *fe);
+	int (*tuner_sleep)(struct dvb_frontend *fe, int onoff);
+	s32 (*get_adc_power)(struct dvb_frontend *fe, u8 mode);
+	int (*get_dc_power)(struct dvb_frontend *fe, u8 IQ);
+	u32 (*ctrl_timf)(struct dvb_frontend *fe, uint8_t op, uint32_t timf);
+	enum frontend_tune_state (*get_tune_state)(struct dvb_frontend *fe);
+	int (*set_tune_state)(struct dvb_frontend *fe, enum frontend_tune_state tune_state);
+	int (*set_slave_frontend)(struct dvb_frontend *fe, struct dvb_frontend *fe_slave);
+	int (*remove_slave_frontend)(struct dvb_frontend *fe);
+	struct dvb_frontend *(*get_slave_frontend)(struct dvb_frontend *fe, int slave_index);
+	int (*i2c_enumeration)(struct i2c_adapter *host, int no_of_demods,
+		u8 default_addr, u8 first_addr, u8 is_dib8096p);
+	struct i2c_adapter *(*get_i2c_master)(struct dvb_frontend *fe, enum dibx000_i2c_interface intf, int gating);
+	int (*pid_filter_ctrl)(struct dvb_frontend *fe, u8 onoff);
+	int (*pid_filter)(struct dvb_frontend *fe, u8 id, u16 pid, u8 onoff);
+	struct dvb_frontend *(*init)(struct i2c_adapter *i2c_adap, u8 i2c_addr, struct dib8000_config *cfg);
+};
+
+#if IS_ENABLED(CONFIG_DVB_DIB8000)
+void *dib8000_attach(struct dib8000_ops *ops);
 #else
-static inline struct dvb_frontend *dib8000_init(struct i2c_adapter *i2c_adap, u8 i2c_addr, struct dib8000_config *cfg)
-{
-	printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
-	return NULL;
-}
-
-static inline struct i2c_adapter *dib8000_get_i2c_master(struct dvb_frontend *fe, enum dibx000_i2c_interface i, int x)
-{
-	printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
-	return NULL;
-}
-
-static inline int dib8000_i2c_enumeration(struct i2c_adapter *host,
-		int no_of_demods, u8 default_addr, u8 first_addr,
-		u8 is_dib8096p)
-{
-	printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
-	return -ENODEV;
-}
-
-static inline int dib8000_set_gpio(struct dvb_frontend *fe, u8 num, u8 dir, u8 val)
-{
-	printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
-	return -ENODEV;
-}
-
-static inline int dib8000_set_wbd_ref(struct dvb_frontend *fe, u16 value)
-{
-	printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
-	return -ENODEV;
-}
-
-static inline int dib8000_pid_filter_ctrl(struct dvb_frontend *fe, u8 onoff)
-{
-	printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
-	return -ENODEV;
-}
-
-static inline int dib8000_pid_filter(struct dvb_frontend *fe, u8 id, u16 pid, u8 onoff)
-{
-	printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
-	return -ENODEV;
-}
-static inline int dib8000_set_tune_state(struct dvb_frontend *fe, enum frontend_tune_state tune_state)
-{
-	printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
-	return -ENODEV;
-}
-static inline enum frontend_tune_state dib8000_get_tune_state(struct dvb_frontend *fe)
-{
-	printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
-	return CT_SHUTDOWN;
-}
-static inline void dib8000_pwm_agc_reset(struct dvb_frontend *fe)
-{
-	printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
-}
-static inline struct i2c_adapter *dib8096p_get_i2c_tuner(struct dvb_frontend *fe)
-{
-	printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
-	return NULL;
-}
-static inline int dib8096p_tuner_sleep(struct dvb_frontend *fe, int onoff)
-{
-	printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
-	return 0;
-}
-static inline s32 dib8000_get_adc_power(struct dvb_frontend *fe, u8 mode)
-{
-	printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
-	return 0;
-}
-static inline int dib8090p_get_dc_power(struct dvb_frontend *fe, u8 IQ)
-{
-	printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
-	return 0;
-}
-static inline u32 dib8000_ctrl_timf(struct dvb_frontend *fe,
-		uint8_t op, uint32_t timf)
-{
-	printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
-	return 0;
-}
-static inline int dib8000_update_pll(struct dvb_frontend *fe,
-		struct dibx000_bandwidth_config *pll, u32 bw, u8 ratio)
-{
-	printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
-	return -ENODEV;
-}
-static inline int dib8000_set_slave_frontend(struct dvb_frontend *fe, struct dvb_frontend *fe_slave)
-{
-	printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
-	return -ENODEV;
-}
-
-int dib8000_remove_slave_frontend(struct dvb_frontend *fe)
-{
-	printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
-	return -ENODEV;
-}
-
-static inline struct dvb_frontend *dib8000_get_slave_frontend(struct dvb_frontend *fe, int slave_index)
+static inline int dib8000_attach(struct dib8000_ops *ops)
 {
 	printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
 	return NULL;