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
21static 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