1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */
2*4882a593Smuzhiyun #ifndef __LM7000_H
3*4882a593Smuzhiyun #define __LM7000_H
4*4882a593Smuzhiyun
5*4882a593Smuzhiyun /* Sanyo LM7000 tuner chip control
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * Copyright 2012 Ondrej Zary <linux@rainbow-software.org>
8*4882a593Smuzhiyun * based on radio-aimslab.c by M. Kirkwood
9*4882a593Smuzhiyun * and radio-sf16fmi.c by M. Kirkwood and Petr Vandrovec
10*4882a593Smuzhiyun */
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun #define LM7000_DATA (1 << 0)
13*4882a593Smuzhiyun #define LM7000_CLK (1 << 1)
14*4882a593Smuzhiyun #define LM7000_CE (1 << 2)
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun #define LM7000_FM_100 (0 << 20)
17*4882a593Smuzhiyun #define LM7000_FM_50 (1 << 20)
18*4882a593Smuzhiyun #define LM7000_FM_25 (2 << 20)
19*4882a593Smuzhiyun #define LM7000_BIT_FM (1 << 23)
20*4882a593Smuzhiyun
lm7000_set_freq(u32 freq,void * handle,void (* set_pins)(void * handle,u8 pins))21*4882a593Smuzhiyun static inline void lm7000_set_freq(u32 freq, void *handle,
22*4882a593Smuzhiyun void (*set_pins)(void *handle, u8 pins))
23*4882a593Smuzhiyun {
24*4882a593Smuzhiyun int i;
25*4882a593Smuzhiyun u8 data;
26*4882a593Smuzhiyun u32 val;
27*4882a593Smuzhiyun
28*4882a593Smuzhiyun freq += 171200; /* Add 10.7 MHz IF */
29*4882a593Smuzhiyun freq /= 400; /* Convert to 25 kHz units */
30*4882a593Smuzhiyun val = freq | LM7000_FM_25 | LM7000_BIT_FM;
31*4882a593Smuzhiyun /* write the 24-bit register, starting with LSB */
32*4882a593Smuzhiyun for (i = 0; i < 24; i++) {
33*4882a593Smuzhiyun data = val & (1 << i) ? LM7000_DATA : 0;
34*4882a593Smuzhiyun set_pins(handle, data | LM7000_CE);
35*4882a593Smuzhiyun udelay(2);
36*4882a593Smuzhiyun set_pins(handle, data | LM7000_CE | LM7000_CLK);
37*4882a593Smuzhiyun udelay(2);
38*4882a593Smuzhiyun set_pins(handle, data | LM7000_CE);
39*4882a593Smuzhiyun udelay(2);
40*4882a593Smuzhiyun }
41*4882a593Smuzhiyun set_pins(handle, 0);
42*4882a593Smuzhiyun }
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun #endif /* __LM7000_H */
45