72a770c94d
Add very simple driver for Sanyo LM7000 AM/FM tuner chip. Only FM is supported as there is no known HW with AM implemented. This will be used by radio-aimslab and radio-sf16fmi. Signed-off-by: Ondrej Zary <linux@rainbow-software.org> Acked-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
44 lines
1 KiB
C
44 lines
1 KiB
C
#ifndef __LM7000_H
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#define __LM7000_H
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/* Sanyo LM7000 tuner chip control
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*
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* Copyright 2012 Ondrej Zary <linux@rainbow-software.org>
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* based on radio-aimslab.c by M. Kirkwood
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* and radio-sf16fmi.c by M. Kirkwood and Petr Vandrovec
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*/
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#define LM7000_DATA (1 << 0)
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#define LM7000_CLK (1 << 1)
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#define LM7000_CE (1 << 2)
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#define LM7000_FM_100 (0 << 20)
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#define LM7000_FM_50 (1 << 20)
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#define LM7000_FM_25 (2 << 20)
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#define LM7000_BIT_FM (1 << 23)
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static inline void lm7000_set_freq(u32 freq, void *handle,
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void (*set_pins)(void *handle, u8 pins))
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{
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int i;
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u8 data;
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u32 val;
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freq += 171200; /* Add 10.7 MHz IF */
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freq /= 400; /* Convert to 25 kHz units */
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val = freq | LM7000_FM_25 | LM7000_BIT_FM;
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/* write the 24-bit register, starting with LSB */
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for (i = 0; i < 24; i++) {
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data = val & (1 << i) ? LM7000_DATA : 0;
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set_pins(handle, data | LM7000_CE);
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udelay(2);
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set_pins(handle, data | LM7000_CE | LM7000_CLK);
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udelay(2);
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set_pins(handle, data | LM7000_CE);
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udelay(2);
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}
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set_pins(handle, 0);
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}
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#endif /* __LM7000_H */
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