drivers/media/radio/lm7000.h

   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 */