lm7000.h

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#ifndef __LM7000_H
#define __LM7000_H

/* Sanyo LM7000 tuner chip control
 *
 * Copyright 2012 Ondrej Zary <[email protected]>
 * 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 */