| Ondrej Zary | 72a770c | 2012-06-13 17:25:32 -0300 | [diff] [blame] | 1 | #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 | |
| 20 | static 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 */ |