1 #ifndef SI21XX_H
2 #define SI21XX_H
3 
4 #include <linux/dvb/frontend.h>
5 #include "dvb_frontend.h"
6 
7 struct si21xx_config {
8 	/* the demodulator's i2c address */
9 	u8 demod_address;
10 
11 	/* minimum delay before retuning */
12 	int min_delay_ms;
13 };
14 
15 #if IS_REACHABLE(CONFIG_DVB_SI21XX)
16 extern struct dvb_frontend *si21xx_attach(const struct si21xx_config *config,
17 						struct i2c_adapter *i2c);
18 #else
19 static inline struct dvb_frontend *si21xx_attach(
20 		const struct si21xx_config *config, struct i2c_adapter *i2c)
21 {
22 	printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
23 	return NULL;
24 }
25 #endif
26 
27 static inline int si21xx_writeregister(struct dvb_frontend *fe, u8 reg, u8 val)
28 {
29 	int r = 0;
30 	u8 buf[] = {reg, val};
31 	if (fe->ops.write)
32 		r = fe->ops.write(fe, buf, 2);
33 	return r;
34 }
35 
36 #endif
37