From 72a770c94deb158fbb1b804c7d0395623c568272 Mon Sep 17 00:00:00 2001 From: Ondrej Zary Date: Wed, 13 Jun 2012 17:25:32 -0300 Subject: [PATCH] [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 Acked-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab --- drivers/media/radio/lm7000.h | 43 ++++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) create mode 100644 drivers/media/radio/lm7000.h diff --git a/drivers/media/radio/lm7000.h b/drivers/media/radio/lm7000.h new file mode 100644 index 00000000000..139cd6b6882 --- /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 + * 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 */ -- 2.41.0