1  /* SPDX-License-Identifier: GPL-2.0 */
2  #ifndef __LM7000_H
3  #define __LM7000_H
4  
5  /* Sanyo LM7000 tuner chip control
6   *
7   * Copyright 2012 Ondrej Zary <linux@rainbow-software.org>
8   * based on radio-aimslab.c by M. Kirkwood
9   * and radio-sf16fmi.c by M. Kirkwood and Petr Vandrovec
10   */
11  
12  #define LM7000_DATA	(1 << 0)
13  #define LM7000_CLK	(1 << 1)
14  #define LM7000_CE	(1 << 2)
15  
16  #define LM7000_FM_100	(0 << 20)
17  #define LM7000_FM_50	(1 << 20)
18  #define LM7000_FM_25	(2 << 20)
19  #define LM7000_BIT_FM	(1 << 23)
20  
lm7000_set_freq(u32 freq,void * handle,void (* set_pins)(void * handle,u8 pins))21  static inline void lm7000_set_freq(u32 freq, void *handle,
22  				void (*set_pins)(void *handle, u8 pins))
23  {
24  	int i;
25  	u8 data;
26  	u32 val;
27  
28  	freq += 171200;		/* Add 10.7 MHz IF */
29  	freq /= 400;		/* Convert to 25 kHz units */
30  	val = freq | LM7000_FM_25 | LM7000_BIT_FM;
31  	/* write the 24-bit register, starting with LSB */
32  	for (i = 0; i < 24; i++) {
33  		data = val & (1 << i) ? LM7000_DATA : 0;
34  		set_pins(handle, data | LM7000_CE);
35  		udelay(2);
36  		set_pins(handle, data | LM7000_CE | LM7000_CLK);
37  		udelay(2);
38  		set_pins(handle, data | LM7000_CE);
39  		udelay(2);
40  	}
41  	set_pins(handle, 0);
42  }
43  
44  #endif /* __LM7000_H */
45