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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
72a770c9 OZ |
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 | ||
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 */ |