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