[media] dib7000: export just one symbol

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

This were reported several times, like:

   drivers/built-in.o: In function `cxusb_dualdig4_rev2_tuner_attach':
>> cxusb.c:(.text+0x27d4b5): undefined reference to `dib7000p_get_i2c_master'
   drivers/built-in.o: In function `dib7070_set_param_override':
   cxusb.c:(.text+0x27d5a5): undefined reference to `dib0070_wbd_offset'
>> cxusb.c:(.text+0x27d5be): undefined reference to `dib7000p_set_wbd_ref'
   drivers/built-in.o: In function `dib7070_tuner_reset':
>> cxusb.c:(.text+0x27d5f9): undefined reference to `dib7000p_set_gpio'
   drivers/built-in.o: In function `cxusb_dualdig4_rev2_frontend_attach':
>> cxusb.c:(.text+0x27df5c): undefined reference to `dib7000p_i2c_enumeration'

In this specific report:
	CONFIG_DVB_USB_CXUSB=y
	CONFIG_DVB_DIB7000P=m

But the same type of bug can happen if:
	CONFIG_DVB_DIB7000P=m
and one of the bridge drivers is compiled builtin (cxusb, cx23885-dvb
and/or dib0700).

As a bonus, dib7000p won't be loaded anymore if the device uses
a different frontend, reducing the memory footprint.

Tested with Hauppauge Nova-TD (2 frontends).

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

1 files changed, 22 insertions, 109 deletions

diff --git a/drivers/media/dvb-frontends/dib7000p.h b/drivers/media/dvb-frontends/dib7000p.h
index 583c94e8eca5..1fea0e972654 100644
--- a/drivers/media/dvb-frontends/dib7000p.h
+++ b/drivers/media/dvb-frontends/dib7000p.h
@@ -46,121 +46,34 @@ struct dib7000p_config {
 
 #define DEFAULT_DIB7000P_I2C_ADDRESS 18
 
-#if IS_ENABLED(CONFIG_DVB_DIB7000P)
-extern struct dvb_frontend *dib7000p_init(struct i2c_adapter *i2c_adap, u8 i2c_addr, struct dib7000p_config *cfg);
-extern struct i2c_adapter *dib7000p_get_i2c_master(struct dvb_frontend *, enum dibx000_i2c_interface, int);
-extern int dib7000p_i2c_enumeration(struct i2c_adapter *i2c, int no_of_demods, u8 default_addr, struct dib7000p_config cfg[]);
-extern int dib7000p_set_gpio(struct dvb_frontend *, u8 num, u8 dir, u8 val);
-extern int dib7000p_set_wbd_ref(struct dvb_frontend *, u16 value);
-extern int dib7000pc_detection(struct i2c_adapter *i2c_adap);
-extern int dib7000p_pid_filter(struct dvb_frontend *, u8 id, u16 pid, u8 onoff);
-extern int dib7000p_pid_filter_ctrl(struct dvb_frontend *fe, u8 onoff);
-extern int dib7000p_update_pll(struct dvb_frontend *fe, struct dibx000_bandwidth_config *bw);
-extern u32 dib7000p_ctrl_timf(struct dvb_frontend *fe, u8 op, u32 timf);
-extern int dib7090_tuner_sleep(struct dvb_frontend *fe, int onoff);
-extern int dib7090_get_adc_power(struct dvb_frontend *fe);
-extern struct i2c_adapter *dib7090_get_i2c_tuner(struct dvb_frontend *fe);
-extern int dib7090_slave_reset(struct dvb_frontend *fe);
-extern int dib7000p_get_agc_values(struct dvb_frontend *fe,
+struct dib7000p_ops {
+	int (*set_wbd_ref)(struct dvb_frontend *demod, u16 value);
+	int (*get_agc_values)(struct dvb_frontend *fe,
 		u16 *agc_global, u16 *agc1, u16 *agc2, u16 *wbd);
-extern int dib7000p_set_agc1_min(struct dvb_frontend *fe, u16 v);
-#else
-static inline struct dvb_frontend *dib7000p_init(struct i2c_adapter *i2c_adap, u8 i2c_addr, struct dib7000p_config *cfg)
-{
-	printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
-	return NULL;
-}
-
-static inline struct i2c_adapter *dib7000p_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 dib7000p_i2c_enumeration(struct i2c_adapter *i2c, int no_of_demods, u8 default_addr, struct dib7000p_config cfg[])
-{
-	printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
-	return -ENODEV;
-}
-
-static inline int dib7000p_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 dib7000p_set_wbd_ref(struct dvb_frontend *fe, u16 value)
-{
-	printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
-	return -ENODEV;
-}
-
-static inline int dib7000pc_detection(struct i2c_adapter *i2c_adap)
-{
-	printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
-	return -ENODEV;
-}
-
-static inline int dib7000p_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 dib7000p_pid_filter_ctrl(struct dvb_frontend *fe, uint8_t onoff)
-{
-	printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
-	return -ENODEV;
-}
-
-static inline int dib7000p_update_pll(struct dvb_frontend *fe, struct dibx000_bandwidth_config *bw)
-{
-	printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
-	return -ENODEV;
-}
-
-static inline u32 dib7000p_ctrl_timf(struct dvb_frontend *fe, u8 op, u32 timf)
-{
-	printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
-	return 0;
-}
-
-static inline int dib7090_tuner_sleep(struct dvb_frontend *fe, int onoff)
-{
-	printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
-	return -ENODEV;
-}
-
-static inline int dib7090_get_adc_power(struct dvb_frontend *fe)
-{
-	printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
-	return -ENODEV;
-}
+	int (*set_agc1_min)(struct dvb_frontend *fe, u16 v);
+	int (*update_pll)(struct dvb_frontend *fe, struct dibx000_bandwidth_config *bw);
+	int (*set_gpio)(struct dvb_frontend *demod, u8 num, u8 dir, u8 val);
+	u32 (*ctrl_timf)(struct dvb_frontend *fe, u8 op, u32 timf);
+	int (*dib7000pc_detection)(struct i2c_adapter *i2c_adap);
+	struct i2c_adapter *(*get_i2c_master)(struct dvb_frontend *demod, 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);
+	int (*i2c_enumeration)(struct i2c_adapter *i2c, int no_of_demods, u8 default_addr, struct dib7000p_config cfg[]);
+	struct i2c_adapter *(*get_i2c_tuner)(struct dvb_frontend *fe);
+	int (*tuner_sleep)(struct dvb_frontend *fe, int onoff);
+	int (*get_adc_power)(struct dvb_frontend *fe);
+	int (*slave_reset)(struct dvb_frontend *fe);
+	struct dvb_frontend *(*init)(struct i2c_adapter *i2c_adap, u8 i2c_addr, struct dib7000p_config *cfg);
+};
 
-static inline struct i2c_adapter *dib7090_get_i2c_tuner(struct dvb_frontend *fe)
+#if IS_ENABLED(CONFIG_DVB_DIB7000P)
+void *dib7000p_attach(struct dib7000p_ops *ops);
+#else
+static inline void *dib7000p_attach(struct dib7000p_ops *ops)
 {
 	printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
 	return NULL;
 }
-
-static inline int dib7090_slave_reset(struct dvb_frontend *fe)
-{
-	printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
-	return -ENODEV;
-}
-
-static inline int dib7000p_get_agc_values(struct dvb_frontend *fe,
-		u16 *agc_global, u16 *agc1, u16 *agc2, u16 *wbd)
-{
-	printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
-	return -ENODEV;
-}
-
-static inline int dib7000p_set_agc1_min(struct dvb_frontend *fe, u16 v)
-{
-	printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
-	return -ENODEV;
-}
 #endif
 
 #endif