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      1 /* $NetBSD: tea5757.c,v 1.5 2005/12/11 12:21:28 christos Exp $ */
      2 /*	$OpenBSD: tea5757.c,v 1.3 2002/01/07 18:32:19 mickey Exp $	*/
      3 
      4 /*
      5  * Copyright (c) 2001 Vladimir Popov <jumbo (at) narod.ru>
      6  * All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     22  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     23  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     24  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     25  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
     26  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 /* Implementation of most common TEA5757 routines */
     30 
     31 /*
     32  * Philips TEA5757H Self Tuned Radio
     33  *         http://www.semiconductors.philips.com/pip/TEA5757H
     34  *
     35  * The TEA5757; TEA5759 is a 44-pin integrated AM/FM stereo radio circuit.
     36  * The radio part is based on the TEA5712.
     37  *
     38  * The TEA5757 is used in FM-standards in which the local oscillator
     39  * frequency is above the radio frequency (e.g. European and American
     40  * standards). The TEA5759 is the version in which the oscillator frequency
     41  * is below the radio frequency (e.g. Japanese standard).
     42  *
     43  * The TEA5757; TEA5759 radio has a bus which consists of three wires:
     44  * BUS-CLOCK: software driven clock input
     45  * DATA: data input/output
     46  * WRITE-ENABLE: write/read input
     47  *
     48  * The TEA5757; TEA5759 has a 25-bit shift register.
     49  *
     50  * The chips are used in Radiotrack II, Guillemot Maxi Radio FM 2000,
     51  * Gemtek PCI cards and most Mediaforte FM tuners and sound cards with
     52  * integrated FM tuners.
     53  */
     54 
     55 #include <sys/cdefs.h>
     56 __KERNEL_RCSID(0, "$NetBSD: tea5757.c,v 1.5 2005/12/11 12:21:28 christos Exp $");
     57 
     58 #include <sys/param.h>
     59 #include <sys/radioio.h>
     60 
     61 #include <dev/ic/tea5757.h>
     62 
     63 /*
     64  * Convert frequency to hardware representation
     65  */
     66 u_int32_t
     67 tea5757_encode_freq(u_int32_t freq, int tea5759)
     68 {
     69 	if (tea5759)
     70 		freq -= IF_FREQ;
     71 	else
     72 		freq += IF_FREQ;
     73 
     74 	/*
     75 	 * NO FLOATING POINT!
     76 	 */
     77 	freq *= 10;
     78 	freq /= 125;
     79 
     80 	return freq & TEA5757_FREQ;
     81 }
     82 
     83 /*
     84  * Convert frequency from hardware representation
     85  */
     86 u_int32_t
     87 tea5757_decode_freq(u_int32_t freq, int tea5759)
     88 {
     89 	freq &= TEA5757_FREQ;
     90 	freq *= 125; /* 12.5 kHz */
     91 	freq /= 10;
     92 
     93 	if (tea5759)
     94 		freq += IF_FREQ;
     95 	else
     96 		freq -= IF_FREQ;
     97 
     98 	return freq;
     99 }
    100 
    101 /*
    102  * Hardware search
    103  */
    104 void
    105 tea5757_search(struct tea5757_t *tea, u_int32_t stereo, u_int32_t lock, int dir)
    106 {
    107 	u_int32_t reg;
    108 	u_int co = 0;
    109 
    110 	reg = stereo | lock | TEA5757_SEARCH_START;
    111 	reg |= dir ? TEA5757_SEARCH_UP : TEA5757_SEARCH_DOWN;
    112 	tea5757_hardware_write(tea, reg);
    113 
    114 	DELAY(TEA5757_ACQUISITION_DELAY);
    115 
    116 	do {
    117 		DELAY(TEA5757_WAIT_DELAY);
    118 		reg = tea->read(tea->iot, tea->ioh, tea->offset);
    119 	} while ((reg & TEA5757_FREQ) == 0 && ++co < 200);
    120 }
    121 
    122 void
    123 tea5757_hardware_write(struct tea5757_t *tea, u_int32_t data)
    124 {
    125 	int i = TEA5757_REGISTER_LENGTH;
    126 
    127 	tea->init(tea->iot, tea->ioh, tea->offset, 0);
    128 
    129 	while (i--)
    130 		if (data & (1 << i))
    131 			tea->write_bit(tea->iot, tea->ioh, tea->offset, 1);
    132 		else
    133 			tea->write_bit(tea->iot, tea->ioh, tea->offset, 0);
    134 
    135 	tea->rset(tea->iot, tea->ioh, tea->offset, 0);
    136 }
    137 
    138 u_int32_t
    139 tea5757_set_freq(struct tea5757_t *tea, u_int32_t stereo, u_int32_t lock, u_int32_t freq)
    140 {
    141 	u_int32_t data = 0ul;
    142 
    143 	if (freq < MIN_FM_FREQ)
    144 		freq = MIN_FM_FREQ;
    145 	if (freq > MAX_FM_FREQ)
    146 		freq = MAX_FM_FREQ;
    147 
    148 	data |= tea5757_encode_freq(freq, tea->flags & TEA5757_TEA5759);
    149 	data |= stereo | lock | TEA5757_SEARCH_END;
    150 	tea5757_hardware_write(tea, data);
    151 
    152 	return freq;
    153 }
    154 
    155 u_int32_t
    156 tea5757_encode_lock(u_int8_t lock)
    157 {
    158 	if (lock < 8)
    159 		return TEA5757_S005;
    160 	if (lock < 15)
    161 		return TEA5757_S010;
    162 	if (lock < 51)
    163 		return TEA5757_S030;
    164 	return TEA5757_S150;
    165 }
    166 
    167 u_int8_t
    168 tea5757_decode_lock(u_int32_t lock)
    169 {
    170 	switch (lock) {
    171 	case TEA5757_S005:
    172 		return 5;
    173 	case TEA5757_S010:
    174 		return 10;
    175 		break;
    176 	case TEA5757_S030:
    177 		return 30;
    178 	case TEA5757_S150:
    179 	default:
    180 		return 150;
    181 	}
    182 }
    183