580 lines
15 KiB
C
580 lines
15 KiB
C
/*-
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* Copyright (c) 1994-1998 Søren Schmidt
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer,
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* without modification, immediately at the beginning of the file.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include "pca.h"
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#if NPCA > 0
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/conf.h>
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#include <sys/proc.h>
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#include <sys/filio.h>
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#include <sys/poll.h>
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#include <sys/vnode.h>
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#include <machine/clock.h>
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#include <machine/pcaudioio.h>
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#include <i386/isa/isa.h>
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#include <i386/isa/isa_device.h>
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#include <i386/isa/timerreg.h>
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#define BUF_SIZE 8192
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#define SAMPLE_RATE 8000
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#define INTERRUPT_RATE 16000
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static struct pca_status {
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char open; /* device open */
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char queries; /* did others try opening */
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unsigned char *buf[3]; /* triple buffering */
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unsigned char *buffer; /* current buffer ptr */
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unsigned in_use[3]; /* buffers fill */
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unsigned index; /* index in current buffer */
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unsigned counter; /* sample counter */
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unsigned scale; /* sample counter scale */
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unsigned sample_rate; /* sample rate */
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unsigned processed; /* samples processed */
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unsigned volume; /* volume for pc-speaker */
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char encoding; /* Ulaw, Alaw or linear */
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u_char current; /* current buffer */
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unsigned char oldval; /* old timer port value */
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char timer_on; /* is playback running */
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struct selinfo wsel; /* select/poll status */
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} pca_status;
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static char buffer1[BUF_SIZE];
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static char buffer2[BUF_SIZE];
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static char buffer3[BUF_SIZE];
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static char volume_table[256];
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static unsigned char ulaw_dsp[] = {
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3, 7, 11, 15, 19, 23, 27, 31,
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35, 39, 43, 47, 51, 55, 59, 63,
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66, 68, 70, 72, 74, 76, 78, 80,
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82, 84, 86, 88, 90, 92, 94, 96,
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98, 99, 100, 101, 102, 103, 104, 105,
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106, 107, 108, 109, 110, 111, 112, 113,
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113, 114, 114, 115, 115, 116, 116, 117,
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117, 118, 118, 119, 119, 120, 120, 121,
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121, 121, 122, 122, 122, 122, 123, 123,
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123, 123, 124, 124, 124, 124, 125, 125,
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125, 125, 125, 125, 126, 126, 126, 126,
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126, 126, 126, 126, 127, 127, 127, 127,
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127, 127, 127, 127, 127, 127, 127, 127,
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128, 128, 128, 128, 128, 128, 128, 128,
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128, 128, 128, 128, 128, 128, 128, 128,
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128, 128, 128, 128, 128, 128, 128, 128,
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253, 249, 245, 241, 237, 233, 229, 225,
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221, 217, 213, 209, 205, 201, 197, 193,
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190, 188, 186, 184, 182, 180, 178, 176,
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174, 172, 170, 168, 166, 164, 162, 160,
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158, 157, 156, 155, 154, 153, 152, 151,
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150, 149, 148, 147, 146, 145, 144, 143,
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143, 142, 142, 141, 141, 140, 140, 139,
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139, 138, 138, 137, 137, 136, 136, 135,
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135, 135, 134, 134, 134, 134, 133, 133,
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133, 133, 132, 132, 132, 132, 131, 131,
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131, 131, 131, 131, 130, 130, 130, 130,
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130, 130, 130, 130, 129, 129, 129, 129,
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129, 129, 129, 129, 129, 129, 129, 129,
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128, 128, 128, 128, 128, 128, 128, 128,
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128, 128, 128, 128, 128, 128, 128, 128,
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128, 128, 128, 128, 128, 128, 128, 128,
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};
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static unsigned char alaw_linear[] = {
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45, 214, 122, 133, 0, 255, 107, 149,
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86, 171, 126, 129, 0, 255, 117, 138,
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13, 246, 120, 135, 0, 255, 99, 157,
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70, 187, 124, 131, 0, 255, 113, 142,
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61, 198, 123, 132, 0, 255, 111, 145,
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94, 163, 127, 128, 0, 255, 119, 136,
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29, 230, 121, 134, 0, 255, 103, 153,
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78, 179, 125, 130, 0, 255, 115, 140,
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37, 222, 122, 133, 0, 255, 105, 151,
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82, 175, 126, 129, 0, 255, 116, 139,
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5, 254, 120, 135, 0, 255, 97, 159,
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66, 191, 124, 131, 0, 255, 112, 143,
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53, 206, 123, 132, 0, 255, 109, 147,
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90, 167, 127, 128, 0, 255, 118, 137,
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21, 238, 121, 134, 0, 255, 101, 155,
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74, 183, 125, 130, 0, 255, 114, 141,
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49, 210, 123, 133, 0, 255, 108, 148,
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88, 169, 127, 129, 0, 255, 118, 138,
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17, 242, 121, 135, 0, 255, 100, 156,
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72, 185, 125, 131, 0, 255, 114, 142,
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64, 194, 124, 132, 0, 255, 112, 144,
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96, 161, 128, 128, 1, 255, 120, 136,
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33, 226, 122, 134, 0, 255, 104, 152,
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80, 177, 126, 130, 0, 255, 116, 140,
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41, 218, 122, 133, 0, 255, 106, 150,
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84, 173, 126, 129, 0, 255, 117, 139,
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9, 250, 120, 135, 0, 255, 98, 158,
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68, 189, 124, 131, 0, 255, 113, 143,
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57, 202, 123, 132, 0, 255, 110, 146,
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92, 165, 127, 128, 0, 255, 119, 137,
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25, 234, 121, 134, 0, 255, 102, 154,
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76, 181, 125, 130, 0, 255, 115, 141,
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};
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static int pca_sleep = 0;
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static int pca_initialized = 0;
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static void pcaintr(struct clockframe *frame);
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static int pcaprobe(struct isa_device *dvp);
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static int pcaattach(struct isa_device *dvp);
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struct isa_driver pcadriver = {
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pcaprobe, pcaattach, "pca",
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};
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static d_open_t pcaopen;
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static d_close_t pcaclose;
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static d_write_t pcawrite;
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static d_ioctl_t pcaioctl;
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static d_poll_t pcapoll;
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#define CDEV_MAJOR 24
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static struct cdevsw pca_cdevsw = {
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/* open */ pcaopen,
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/* close */ pcaclose,
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/* read */ noread,
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/* write */ pcawrite,
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/* ioctl */ pcaioctl,
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/* poll */ pcapoll,
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/* mmap */ nommap,
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/* strategy */ nostrategy,
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/* name */ "pca",
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/* maj */ CDEV_MAJOR,
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/* dump */ nodump,
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/* psize */ nopsize,
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/* flags */ 0,
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/* bmaj */ -1
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};
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static void pca_continue __P((void));
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static void pca_init __P((void));
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static void pca_pause __P((void));
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static __inline void
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conv(const void *table, void *buff, unsigned int n)
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{
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__asm__("1:\tmovb (%2), %3\n"
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"\txlatb\n"
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"\tmovb %3, (%2)\n"
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"\tinc %2\n"
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"\tdec %1\n"
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"\tjnz 1b\n"
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:
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:"b" (table), "c" (n), "D" (buff), "a" ((char)n)
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:"bx","cx","di","ax");
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}
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static void
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pca_volume(int volume)
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{
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int i, j;
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for (i=0; i<256; i++) {
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j = ((i-128)*volume)/25;
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/* XXX
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j = ((i-128)*volume)/100;
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*/
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if (j<-128)
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j = -128;
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if (j>127)
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j = 127;
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volume_table[i] = (((255-(j + 128))/4)+1);
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}
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}
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static void
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pca_init(void)
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{
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cdevsw_add(&pca_cdevsw);
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pca_status.open = 0;
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pca_status.queries = 0;
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pca_status.timer_on = 0;
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pca_status.buf[0] = (unsigned char *)&buffer1[0];
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pca_status.buf[1] = (unsigned char *)&buffer2[0];
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pca_status.buf[2] = (unsigned char *)&buffer3[0];
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pca_status.buffer = pca_status.buf[0];
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pca_status.in_use[0] = pca_status.in_use[1] = pca_status.in_use[2] = 0;
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pca_status.current = 0;
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pca_status.sample_rate = SAMPLE_RATE;
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pca_status.scale = (pca_status.sample_rate << 8) / INTERRUPT_RATE;
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pca_status.encoding = AUDIO_ENCODING_ULAW;
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pca_status.volume = 100;
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pca_volume(pca_status.volume);
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}
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static int
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pca_start(void)
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{
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int x = splhigh();
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int rv = 0;
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/* use the first buffer */
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pca_status.current = 0;
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pca_status.index = 0;
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pca_status.counter = 0;
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pca_status.buffer = pca_status.buf[pca_status.current];
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pca_status.oldval = inb(IO_PPI) | 0x03;
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/* acquire the timers */
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if (acquire_timer2(TIMER_LSB|TIMER_ONESHOT))
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rv = -1;
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else if (acquire_timer0(INTERRUPT_RATE, pcaintr)) {
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release_timer2();
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rv = -1;
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} else
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pca_status.timer_on = 1;
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splx(x);
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return rv;
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}
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static void
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pca_stop(void)
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{
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int x = splhigh();
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/* release the timers */
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release_timer0();
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release_timer2();
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/* reset the buffer */
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pca_status.in_use[0] = pca_status.in_use[1] = pca_status.in_use[2] = 0;
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pca_status.index = 0;
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pca_status.counter = 0;
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pca_status.current = 0;
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pca_status.buffer = pca_status.buf[pca_status.current];
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pca_status.timer_on = 0;
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splx(x);
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}
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static void
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pca_pause(void)
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{
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int x = splhigh();
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release_timer0();
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release_timer2();
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pca_status.timer_on = 0;
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splx(x);
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}
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static void
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pca_continue(void)
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{
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int x = splhigh();
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pca_status.oldval = inb(IO_PPI) | 0x03;
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acquire_timer2(TIMER_LSB|TIMER_ONESHOT);
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acquire_timer0(INTERRUPT_RATE, pcaintr);
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pca_status.timer_on = 1;
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splx(x);
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}
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static int
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pca_wait(void)
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{
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int error, x;
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if (!pca_status.timer_on)
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return 0;
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while (pca_status.in_use[0] || pca_status.in_use[1] ||
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pca_status.in_use[2]) {
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x = spltty();
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pca_sleep = 1;
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error = tsleep(&pca_sleep, PZERO|PCATCH, "pca_drain", 0);
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pca_sleep = 0;
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splx(x);
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if (error != 0 && error != ERESTART) {
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pca_stop();
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return error;
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}
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}
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return 0;
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}
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static int
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pcaprobe(struct isa_device *dvp)
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{
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return(-1);
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}
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static int
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pcaattach(struct isa_device *dvp)
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{
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printf("pca%d: PC speaker audio driver\n", dvp->id_unit);
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pca_init();
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make_dev(&pca_cdevsw, 0, 0, 0, 0600, "pcaudio");
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make_dev(&pca_cdevsw, 128, 0, 0, 0600, "pcaudioctl");
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return 1;
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}
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static int
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pcaopen(dev_t dev, int flags, int fmt, struct proc *p)
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{
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/* audioctl device can always be opened */
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if (minor(dev) == 128)
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return 0;
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if (minor(dev) > 0)
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return ENXIO;
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if (!pca_initialized) {
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pca_init();
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pca_initialized = 1;
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}
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/* audio device can only be open by one process */
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if (pca_status.open) {
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pca_status.queries = 1;
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return EBUSY;
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}
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pca_status.buffer = pca_status.buf[0];
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pca_status.in_use[0] = pca_status.in_use[1] = pca_status.in_use[2] = 0;
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pca_status.timer_on = 0;
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pca_status.open = 1;
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pca_status.processed = 0;
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return 0;
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}
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static int
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pcaclose(dev_t dev, int flags, int fmt, struct proc *p)
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{
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/* audioctl device can always be closed */
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if (minor(dev) == 128)
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return 0;
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if (minor(dev) > 0)
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return ENXIO;
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/* audio device close drains all output and restores timers */
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pca_wait();
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pca_stop();
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pca_status.open = 0;
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return 0;
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}
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static int
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pcawrite(dev_t dev, struct uio *uio, int flag)
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{
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int count, error, which, x;
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/* only audio device can be written */
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if (minor(dev) > 0)
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return ENXIO;
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while ((count = min(BUF_SIZE, uio->uio_resid)) > 0) {
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if (pca_status.in_use[0] && pca_status.in_use[1] &&
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pca_status.in_use[2]) {
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if (flag & IO_NDELAY)
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return EWOULDBLOCK;
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x = spltty();
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pca_sleep = 1;
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error = tsleep(&pca_sleep, PZERO|PCATCH, "pca_wait", 0);
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pca_sleep = 0;
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splx(x);
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if (error != 0 && error != ERESTART) {
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pca_stop();
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return error;
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}
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}
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if (!pca_status.in_use[0])
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which = 0;
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else if (!pca_status.in_use[1])
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which = 1;
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else
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which = 2;
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if (count && !pca_status.in_use[which]) {
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uiomove(pca_status.buf[which], count, uio);
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pca_status.processed += count;
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switch (pca_status.encoding) {
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case AUDIO_ENCODING_ULAW:
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conv(ulaw_dsp, pca_status.buf[which], count);
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break;
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case AUDIO_ENCODING_ALAW:
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conv(alaw_linear, pca_status.buf[which], count);
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break;
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case AUDIO_ENCODING_RAW:
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break;
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}
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pca_status.in_use[which] = count;
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if (!pca_status.timer_on)
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if (pca_start())
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return EBUSY;
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}
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}
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return 0;
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}
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static int
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pcaioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p)
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{
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audio_info_t *auptr;
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switch(cmd) {
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case AUDIO_GETINFO:
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auptr = (audio_info_t *)data;
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auptr->play.sample_rate = pca_status.sample_rate;
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auptr->play.channels = 1;
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auptr->play.precision = 8;
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auptr->play.encoding = pca_status.encoding;
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auptr->play.gain = pca_status.volume;
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auptr->play.port = 0;
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auptr->play.samples = pca_status.processed;
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auptr->play.eof = 0;
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auptr->play.pause = !pca_status.timer_on;
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auptr->play.error = 0;
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auptr->play.waiting = pca_status.queries;
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auptr->play.open = pca_status.open;
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auptr->play.active = pca_status.timer_on;
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return 0;
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case AUDIO_SETINFO:
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auptr = (audio_info_t *)data;
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if (auptr->play.sample_rate != (unsigned int)~0) {
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pca_status.sample_rate = auptr->play.sample_rate;
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pca_status.scale =
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(pca_status.sample_rate << 8) / INTERRUPT_RATE;
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}
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if (auptr->play.encoding != (unsigned int)~0) {
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pca_status.encoding = auptr->play.encoding;
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}
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if (auptr->play.gain != (unsigned int)~0) {
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pca_status.volume = auptr->play.gain;
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pca_volume(pca_status.volume);
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}
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if (auptr->play.pause != (unsigned char)~0) {
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if (auptr->play.pause)
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pca_pause();
|
|
else
|
|
pca_continue();
|
|
}
|
|
|
|
return 0;
|
|
|
|
case AUDIO_DRAIN:
|
|
case AUDIO_COMPAT_DRAIN:
|
|
return pca_wait();
|
|
|
|
case AUDIO_FLUSH:
|
|
case AUDIO_COMPAT_FLUSH:
|
|
pca_stop();
|
|
return 0;
|
|
case FIONBIO:
|
|
return 0;
|
|
}
|
|
return ENXIO;
|
|
}
|
|
|
|
|
|
static void
|
|
pcaintr(struct clockframe *frame)
|
|
{
|
|
if (pca_status.index < pca_status.in_use[pca_status.current]) {
|
|
disable_intr();
|
|
__asm__("outb %0,$0x61\n"
|
|
"andb $0xFE,%0\n"
|
|
"outb %0,$0x61"
|
|
: : "a" ((char)pca_status.oldval) );
|
|
__asm__("xlatb\n"
|
|
"outb %0,$0x42"
|
|
: : "a" ((char)pca_status.buffer[pca_status.index]),
|
|
"b" (volume_table) );
|
|
enable_intr();
|
|
pca_status.counter += pca_status.scale;
|
|
pca_status.index = (pca_status.counter >> 8);
|
|
}
|
|
if (pca_status.index >= pca_status.in_use[pca_status.current]) {
|
|
pca_status.index = pca_status.counter = 0;
|
|
pca_status.in_use[pca_status.current] = 0;
|
|
pca_status.current++;
|
|
if (pca_status.current > 2)
|
|
pca_status.current = 0;
|
|
pca_status.buffer = pca_status.buf[pca_status.current];
|
|
if (pca_sleep)
|
|
wakeup(&pca_sleep);
|
|
if (pca_status.wsel.si_pid) {
|
|
selwakeup((struct selinfo *)&pca_status.wsel.si_pid);
|
|
pca_status.wsel.si_pid = 0;
|
|
pca_status.wsel.si_flags = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
static int
|
|
pcapoll(dev_t dev, int events, struct proc *p)
|
|
{
|
|
int s;
|
|
struct proc *p1;
|
|
int revents = 0;
|
|
|
|
s = spltty();
|
|
|
|
if (events & (POLLOUT | POLLWRNORM)) {
|
|
if (!pca_status.in_use[0] || !pca_status.in_use[1] ||
|
|
!pca_status.in_use[2])
|
|
revents |= events & (POLLOUT | POLLWRNORM);
|
|
else {
|
|
if (pca_status.wsel.si_pid &&
|
|
(p1=pfind(pca_status.wsel.si_pid))
|
|
&& p1->p_wchan == (caddr_t)&selwait)
|
|
pca_status.wsel.si_flags = SI_COLL;
|
|
else
|
|
pca_status.wsel.si_pid = p->p_pid;
|
|
}
|
|
}
|
|
splx(s);
|
|
return (revents);
|
|
}
|
|
|
|
#endif
|