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[media] radio: Add Sanyo LM7000 tuner driver

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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>
This commit is contained in:
Ondrej Zary 2012-06-13 17:25:32 -03:00 committed by Mauro Carvalho Chehab
parent f6d1b15c15
commit 72a770c94d
1 changed files with 43 additions and 0 deletions
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drivers/media/radio/lm7000.h Normal file
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#ifndef __LM7000_H
#define __LM7000_H
/* Sanyo LM7000 tuner chip control
*
* Copyright 2012 Ondrej Zary <linux@rainbow-software.org>
* based on radio-aimslab.c by M. Kirkwood
* and radio-sf16fmi.c by M. Kirkwood and Petr Vandrovec
*/
#define LM7000_DATA (1 << 0)
#define LM7000_CLK (1 << 1)
#define LM7000_CE (1 << 2)
#define LM7000_FM_100 (0 << 20)
#define LM7000_FM_50 (1 << 20)
#define LM7000_FM_25 (2 << 20)
#define LM7000_BIT_FM (1 << 23)
static inline void lm7000_set_freq(u32 freq, void *handle,
void (*set_pins)(void *handle, u8 pins))
{
int i;
u8 data;
u32 val;
freq += 171200; /* Add 10.7 MHz IF */
freq /= 400; /* Convert to 25 kHz units */
val = freq | LM7000_FM_25 | LM7000_BIT_FM;
/* write the 24-bit register, starting with LSB */
for (i = 0; i < 24; i++) {
data = val & (1 << i) ? LM7000_DATA : 0;
set_pins(handle, data | LM7000_CE);
udelay(2);
set_pins(handle, data | LM7000_CE | LM7000_CLK);
udelay(2);
set_pins(handle, data | LM7000_CE);
udelay(2);
}
set_pins(handle, 0);
}
#endif /* __LM7000_H */