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Ondrej Zary72a770c2012-06-13 17:25:32 -03001#ifndef __LM7000_H
2#define __LM7000_H
3
4/* Sanyo LM7000 tuner chip control
5 *
6 * Copyright 2012 Ondrej Zary <linux@rainbow-software.org>
7 * based on radio-aimslab.c by M. Kirkwood
8 * and radio-sf16fmi.c by M. Kirkwood and Petr Vandrovec
9 */
10
11#define LM7000_DATA (1 << 0)
12#define LM7000_CLK (1 << 1)
13#define LM7000_CE (1 << 2)
14
15#define LM7000_FM_100 (0 << 20)
16#define LM7000_FM_50 (1 << 20)
17#define LM7000_FM_25 (2 << 20)
18#define LM7000_BIT_FM (1 << 23)
19
20static inline void lm7000_set_freq(u32 freq, void *handle,
21 void (*set_pins)(void *handle, u8 pins))
22{
23 int i;
24 u8 data;
25 u32 val;
26
27 freq += 171200; /* Add 10.7 MHz IF */
28 freq /= 400; /* Convert to 25 kHz units */
29 val = freq | LM7000_FM_25 | LM7000_BIT_FM;
30 /* write the 24-bit register, starting with LSB */
31 for (i = 0; i < 24; i++) {
32 data = val & (1 << i) ? LM7000_DATA : 0;
33 set_pins(handle, data | LM7000_CE);
34 udelay(2);
35 set_pins(handle, data | LM7000_CE | LM7000_CLK);
36 udelay(2);
37 set_pins(handle, data | LM7000_CE);
38 udelay(2);
39 }
40 set_pins(handle, 0);
41}
42
43#endif /* __LM7000_H */