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 */ 45