| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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| 2 | #ifndef __LM7000_H |
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| 3 | #define __LM7000_H |
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| 4 | |
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| 5 | /* Sanyo LM7000 tuner chip control |
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| 6 | * |
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| 7 | * Copyright 2012 Ondrej Zary <linux@rainbow-software.org> |
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| 8 | * based on radio-aimslab.c by M. Kirkwood |
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| 9 | * and radio-sf16fmi.c by M. Kirkwood and Petr Vandrovec |
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| 10 | */ |
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| 11 | |
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| 12 | #define LM7000_DATA (1 << 0) |
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| 13 | #define LM7000_CLK (1 << 1) |
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| 14 | #define LM7000_CE (1 << 2) |
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| 15 | |
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| 16 | #define LM7000_FM_100 (0 << 20) |
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| 17 | #define LM7000_FM_50 (1 << 20) |
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| 18 | #define LM7000_FM_25 (2 << 20) |
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| 19 | #define LM7000_BIT_FM (1 << 23) |
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| 20 | |
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| 21 | static inline void lm7000_set_freq(u32 freq, void *handle, |
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| 22 | void (*set_pins)(void *handle, u8 pins)) |
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| 23 | { |
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| 24 | int i; |
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| 25 | u8 data; |
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| 26 | u32 val; |
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| 27 | |
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| 28 | freq += 171200; /* Add 10.7 MHz IF */ |
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| 29 | freq /= 400; /* Convert to 25 kHz units */ |
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| 30 | val = freq | LM7000_FM_25 | LM7000_BIT_FM; |
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| 31 | /* write the 24-bit register, starting with LSB */ |
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| 32 | for (i = 0; i < 24; i++) { |
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| 33 | data = val & (1 << i) ? LM7000_DATA : 0; |
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| 34 | set_pins(handle, data | LM7000_CE); |
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| 35 | udelay(2); |
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| 36 | set_pins(handle, data | LM7000_CE | LM7000_CLK); |
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| 37 | udelay(2); |
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| 38 | set_pins(handle, data | LM7000_CE); |
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| 39 | udelay(2); |
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| 40 | } |
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| 41 | set_pins(handle, 0); |
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| 42 | } |
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| 43 | |
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| 44 | #endif /* __LM7000_H */ |
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| 45 | |
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