1 #ifndef SI21XX_H
2 #define SI21XX_H
3 
4 #include <linux/kconfig.h>
5 #include <linux/dvb/frontend.h>
6 #include "dvb_frontend.h"
7 
8 struct si21xx_config {
9 	/* the demodulator's i2c address */
10 	u8 demod_address;
11 
12 	/* minimum delay before retuning */
13 	int min_delay_ms;
14 };
15 
16 #if IS_REACHABLE(CONFIG_DVB_SI21XX)
17 extern struct dvb_frontend *si21xx_attach(const struct si21xx_config *config,
18 						struct i2c_adapter *i2c);
19 #else
20 static inline struct dvb_frontend *si21xx_attach(
21 		const struct si21xx_config *config, struct i2c_adapter *i2c)
22 {
23 	printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
24 	return NULL;
25 }
26 #endif
27 
28 static inline int si21xx_writeregister(struct dvb_frontend *fe, u8 reg, u8 val)
29 {
30 	int r = 0;
31 	u8 buf[] = {reg, val};
32 	if (fe->ops.write)
33 		r = fe->ops.write(fe, buf, 2);
34 	return r;
35 }
36 
37 #endif
38