drivers/media/radio/lm7000.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __LM7000_H
   3 #define __LM7000_H
   4
   5 /* Sanyo LM7000 tuner chip control
   6  *
   7  * Copyright 2012 Ondrej Zary <linux@rainbow-software.org>
   8  * based on radio-aimslab.c by M. Kirkwood
   9  * and radio-sf16fmi.c by M. Kirkwood and Petr Vandrovec
  10  */
  11
  12 #define LM7000_DATA     (1 << 0)
  13 #define LM7000_CLK      (1 << 1)
  14 #define LM7000_CE       (1 << 2)
  15
  16 #define LM7000_FM_100   (0 << 20)
  17 #define LM7000_FM_50    (1 << 20)
  18 #define LM7000_FM_25    (2 << 20)
  19 #define LM7000_BIT_FM   (1 << 23)
  20
  21 static inline void lm7000_set_freq(u32 freq, void *handle,
  22                                 void (*set_pins)(void *handle, u8 pins))
  23 {
  24         int i;
  25         u8 data;
  26         u32 val;
  27
  28         freq += 171200;         /* Add 10.7 MHz IF */
  29         freq /= 400;            /* Convert to 25 kHz units */
  30         val = freq | LM7000_FM_25 | LM7000_BIT_FM;
  31         /* write the 24-bit register, starting with LSB */
  32         for (i = 0; i < 24; i++) {
  33                 data = val & (1 << i) ? LM7000_DATA : 0;
  34                 set_pins(handle, data | LM7000_CE);
  35                 udelay(2);
  36                 set_pins(handle, data | LM7000_CE | LM7000_CLK);
  37                 udelay(2);
  38                 set_pins(handle, data | LM7000_CE);
  39                 udelay(2);
  40         }
  41         set_pins(handle, 0);
  42 }
  43
  44 #endif /* __LM7000_H */