diff options
| author | Ondrej Zary <linux@rainbow-software.org> | 2012-06-13 17:25:32 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2012-06-25 11:07:27 -0300 |
| commit | 72a770c94deb158fbb1b804c7d0395623c568272 (patch) | |
| tree | 8d748bbcbebe0549e39d42850f325cd4d3dd0588 /drivers/media/radio | |
| parent | f6d1b15c154d07c88829426d2c83c6321fe31cf3 (diff) | |
[media] radio: Add Sanyo LM7000 tuner driver
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>
Diffstat (limited to 'drivers/media/radio')
| -rw-r--r-- | drivers/media/radio/lm7000.h | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/drivers/media/radio/lm7000.h b/drivers/media/radio/lm7000.h new file mode 100644 index 000000000000..139cd6b68824 --- /dev/null +++ b/drivers/media/radio/lm7000.h @@ -0,0 +1,43 @@ +#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 */ |