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Commit 72a770c94deb158fbb1b804c7d0395623c568272

Authored by Ondrej Zary
Committed by Mauro Carvalho Chehab
1 parent f6d1b15c15
Exists in smarc-l5.0.0_1.0.0-ga and in 5 other branches imx_3.10.17_1.0.1_ga, imx_3.10.53_1.1.0_ga, imx_3.14.28_1.0.0_ga, smarc-imx_3.10.53_1.1.0_ga, smarc-imx_3.14.28_1.0.0_ga

[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>

Showing 1 changed file with 43 additions and 0 deletions Side-by-side Diff

drivers/media/radio/lm7000.h
Diff comments   View file @ 72a770c
  1 +#ifndef __LM7000_H
  2 +#define __LM7000_H
  3 +
  4 +/* Sanyo LM7000 tuner chip control
  5 + *
  6 + * Copyright 2012 Ondrej Zary <linux@rainbow-software.org>
  7 + * based on radio-aimslab.c by M. Kirkwood
  8 + * and radio-sf16fmi.c by M. Kirkwood and Petr Vandrovec
  9 + */
  10 +
  11 +#define LM7000_DATA (1 << 0)
  12 +#define LM7000_CLK (1 << 1)
  13 +#define LM7000_CE (1 << 2)
  14 +
  15 +#define LM7000_FM_100 (0 << 20)
  16 +#define LM7000_FM_50 (1 << 20)
  17 +#define LM7000_FM_25 (2 << 20)
  18 +#define LM7000_BIT_FM (1 << 23)
  19 +
  20 +static inline void lm7000_set_freq(u32 freq, void *handle,
  21 + void (*set_pins)(void *handle, u8 pins))
  22 +{
  23 + int i;
  24 + u8 data;
  25 + u32 val;
  26 +
  27 + freq += 171200; /* Add 10.7 MHz IF */
  28 + freq /= 400; /* Convert to 25 kHz units */
  29 + val = freq | LM7000_FM_25 | LM7000_BIT_FM;
  30 + /* write the 24-bit register, starting with LSB */
  31 + for (i = 0; i < 24; i++) {
  32 + data = val & (1 << i) ? LM7000_DATA : 0;
  33 + set_pins(handle, data | LM7000_CE);
  34 + udelay(2);
  35 + set_pins(handle, data | LM7000_CE | LM7000_CLK);
  36 + udelay(2);
  37 + set_pins(handle, data | LM7000_CE);
  38 + udelay(2);
  39 + }
  40 + set_pins(handle, 0);
  41 +}
  42 +
  43 +#endif /* __LM7000_H */