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 | |
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 | |