2127f26023
for possible buffer overflow problems. Replaced most sprintf()'s with snprintf(); for others cases, added terminating NUL bytes where appropriate, replaced constants like "16" with sizeof(), etc. These changes include several bug fixes, but most changes are for maintainability's sake. Any instance where it wasn't "immediately obvious" that a buffer overflow could not occur was made safer. Reviewed by: Bruce Evans <bde@zeta.org.au> Reviewed by: Matthew Dillon <dillon@apollo.backplane.com> Reviewed by: Mike Spengler <mks@networkcs.com>
538 lines
12 KiB
C
538 lines
12 KiB
C
/*
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* sound/sb16_dsp.c
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*
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* The low level driver for the SoundBlaster DSP chip.
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*
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* (C) 1993 J. Schubert (jsb@sth.ruhr-uni-bochum.de)
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*
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* based on SB-driver by (C) Hannu Savolainen
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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 are
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* met: 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer. 2.
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#define DEB(x)
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#define DEB1(x)
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#include <i386/isa/sound/sound_config.h>
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#include "sb.h"
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#include <i386/isa/sound/sb_mixer.h>
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#include <i386/isa/sound/sbcard.h>
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#if defined(CONFIG_SB16) && (NSB > 0) && defined(CONFIG_AUDIO) && defined(CONFIG_SBPRO)
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extern sound_os_info *sb_osp;
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extern int sbc_base;
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static int sb16_dsp_ok = 0;
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static int dsp_16bit = 0;
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static int dsp_stereo = 0;
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static int dsp_current_speed = 8000;
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static int dsp_busy = 0;
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static int dma16, dma8;
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static int trigger_bits = 0;
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static u_long dsp_count = 0;
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static int irq_mode = IMODE_NONE;
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static int my_dev = 0;
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static volatile int intr_active = 0;
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static int sb16_dsp_open(int dev, int mode);
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static void sb16_dsp_close(int dev);
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static void sb16_dsp_output_block(int dev, u_long buf, int count, int intrflag, int dma_restart);
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static void sb16_dsp_start_input(int dev, u_long buf, int count, int intrflag, int dma_restart);
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static int sb16_dsp_ioctl(int dev, u_int cmd, ioctl_arg arg, int local);
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static int sb16_dsp_prepare_for_input(int dev, int bsize, int bcount);
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static int sb16_dsp_prepare_for_output(int dev, int bsize, int bcount);
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static void sb16_dsp_reset(int dev);
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static void sb16_dsp_halt(int dev);
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static void sb16_dsp_trigger(int dev, int bits);
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static int dsp_set_speed(int);
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static int dsp_set_stereo(int);
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static void dsp_cleanup(void);
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static struct audio_operations sb16_dsp_operations =
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{
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"SoundBlaster 16",
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DMA_AUTOMODE,
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AFMT_U8 | AFMT_S16_LE,
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NULL,
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sb16_dsp_open,
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sb16_dsp_close,
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sb16_dsp_output_block,
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sb16_dsp_start_input,
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sb16_dsp_ioctl,
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sb16_dsp_prepare_for_input,
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sb16_dsp_prepare_for_output,
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sb16_dsp_reset,
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sb16_dsp_halt,
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NULL,
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NULL,
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NULL,
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NULL,
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sb16_dsp_trigger
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};
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static int
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sb_dsp_command01(u_char val)
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{
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int i = 1 << 16;
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while (--i & (!inb(DSP_STATUS) & 0x80));
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if (!i)
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printf("SB16 sb_dsp_command01 Timeout\n");
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return sb_dsp_command(val);
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}
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static int
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dsp_set_speed(int mode)
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{
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DEB(printf("dsp_set_speed(%d)\n", mode));
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if (mode) {
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RANGE (mode, 5000, 44100);
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dsp_current_speed = mode;
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}
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return mode;
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}
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static int
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dsp_set_stereo(int mode)
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{
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DEB(printf("dsp_set_stereo(%d)\n", mode));
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dsp_stereo = mode;
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return mode;
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}
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static int
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dsp_set_bits(int arg)
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{
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DEB(printf("dsp_set_bits(%d)\n", arg));
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if (arg)
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dsp_16bit = (arg == 16) ? 1 : 0 ;
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return dsp_16bit ? 16 : 8;
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}
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static int
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sb16_dsp_ioctl(int dev, u_int cmd, ioctl_arg arg, int local)
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{
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switch (cmd) {
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case SOUND_PCM_WRITE_RATE:
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if (local)
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return dsp_set_speed((int) arg);
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return *(int *) arg = dsp_set_speed((*(int *) arg));
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case SOUND_PCM_READ_RATE:
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if (local)
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return dsp_current_speed;
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return *(int *) arg = dsp_current_speed;
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case SNDCTL_DSP_STEREO:
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if (local)
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return dsp_set_stereo((int) arg);
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return *(int *) arg = dsp_set_stereo((*(int *) arg));
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case SOUND_PCM_WRITE_CHANNELS:
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if (local)
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return dsp_set_stereo((int) arg - 1) + 1;
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return *(int *) arg = dsp_set_stereo((*(int *) arg) - 1) + 1;
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case SOUND_PCM_READ_CHANNELS:
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if (local)
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return dsp_stereo + 1;
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return *(int *) arg = dsp_stereo + 1;
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case SNDCTL_DSP_SETFMT:
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if (local)
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return dsp_set_bits((int) arg);
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return *(int *) arg = dsp_set_bits((*(int *) arg));
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case SOUND_PCM_READ_BITS:
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if (local)
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return dsp_16bit ? 16 : 8;
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return *(int *) arg = dsp_16bit ? 16 : 8;
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case SOUND_PCM_WRITE_FILTER: /* NOT YET IMPLEMENTED */
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if ((*(int *) arg) > 1)
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return *(int *) arg = -(EINVAL);
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case FIOASYNC:
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if (local)
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return 1;
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return *(int *) arg = 1;
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case FIONBIO:
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if (local)
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return 1;
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return *(int *) arg = 1;
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default:
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return -(EINVAL);
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}
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return -(EINVAL);
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}
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static int
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sb16_dsp_open(int dev, int mode)
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{
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int retval;
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DEB(printf("sb16_dsp_open()\n"));
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if (!sb16_dsp_ok) {
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printf("SB16 Error: SoundBlaster board not installed\n");
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return -(ENXIO);
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}
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if (intr_active)
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return -(EBUSY);
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sb_reset_dsp();
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irq_mode = IMODE_NONE;
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dsp_busy = 1;
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trigger_bits = 0;
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return 0;
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}
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static void
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sb16_dsp_close(int dev)
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{
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u_long flags;
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DEB(printf("sb16_dsp_close()\n"));
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sb_dsp_command01(0xd9);
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sb_dsp_command01(0xd5);
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flags = splhigh();
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audio_devs[dev]->dmachan1 = dma8;
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dsp_cleanup();
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dsp_busy = 0;
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splx(flags);
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}
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static void
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sb16_dsp_output_block(int dev, u_long buf, int count, int intrflag, int dma_restart)
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{
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u_long flags, cnt;
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cnt = count;
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if (dsp_16bit)
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cnt >>= 1;
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cnt--;
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if (audio_devs[dev]->flags & DMA_AUTOMODE && intrflag && cnt==dsp_count) {
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irq_mode = IMODE_OUTPUT;
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intr_active = 1;
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return; /* Auto mode on. No need to react */
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}
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flags = splhigh();
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if (dma_restart) {
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sb16_dsp_halt(dev);
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DMAbuf_start_dma(dev, buf, count, 1);
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}
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sb_dsp_command(0x41);
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sb_dsp_command((u_char) ((dsp_current_speed >> 8) & 0xff));
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sb_dsp_command((u_char) (dsp_current_speed & 0xff));
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sb_dsp_command((u_char) (dsp_16bit ? 0xb6 : 0xc6));
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dsp_count = cnt;
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sb_dsp_command((u_char) ((dsp_stereo ? 0x20 : 0) +
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(dsp_16bit ? 0x10 : 0)));
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sb_dsp_command((u_char) (cnt & 0xff));
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sb_dsp_command((u_char) (cnt >> 8));
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irq_mode = IMODE_OUTPUT;
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intr_active = 1;
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splx(flags);
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}
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static void
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sb16_dsp_start_input(int dev, u_long buf, int count, int intrflag, int dma_restart)
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{
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u_long flags, cnt;
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cnt = count;
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if (dsp_16bit)
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cnt >>= 1;
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cnt--;
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if (audio_devs[dev]->flags & DMA_AUTOMODE && intrflag && cnt == dsp_count) {
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irq_mode = IMODE_INPUT;
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intr_active = 1;
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return; /* Auto mode on. No need to react */
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}
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flags = splhigh();
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if (dma_restart) {
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sb_reset_dsp();
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DMAbuf_start_dma(dev, buf, count, 0);
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}
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sb_dsp_command(0x42);
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sb_dsp_command((u_char) ((dsp_current_speed >> 8) & 0xff));
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sb_dsp_command((u_char) (dsp_current_speed & 0xff));
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sb_dsp_command((u_char) (dsp_16bit ? 0xbe : 0xce));
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dsp_count = cnt;
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sb_dsp_command((u_char) ((dsp_stereo ? 0x20 : 0) +
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(dsp_16bit ? 0x10 : 0)));
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sb_dsp_command01((u_char) (cnt & 0xff));
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sb_dsp_command((u_char) (cnt >> 8));
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irq_mode = IMODE_INPUT;
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intr_active = 1;
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splx(flags);
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}
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static int
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sb16_dsp_prepare_for_input(int dev, int bsize, int bcount)
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{
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int fudge;
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struct dma_buffparms *dmap = audio_devs[dev]->dmap_in;
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audio_devs[my_dev]->dmachan2 = dsp_16bit ? dma16 : dma8;
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fudge = audio_devs[my_dev]->dmachan2 ;
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if (dmap->dma_chan != fudge ) {
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isa_dma_release( dmap->dma_chan);
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isa_dma_acquire(fudge);
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dmap->dma_chan = fudge;
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}
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dsp_count = 0;
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dsp_cleanup();
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if (dsp_16bit)
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sb_dsp_command(0xd5); /* Halt DMA until trigger() is called */
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else
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sb_dsp_command(0xd0); /* Halt DMA until trigger() is called */
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trigger_bits = 0;
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return 0;
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}
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static int
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sb16_dsp_prepare_for_output(int dev, int bsize, int bcount)
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{
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int fudge = dsp_16bit ? dma16 : dma8;
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struct dma_buffparms *dmap = audio_devs[dev]->dmap_out;
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if (dmap->dma_chan != fudge ) {
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isa_dma_release( dmap->dma_chan);
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isa_dma_acquire(fudge);
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dmap->dma_chan = fudge;
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}
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audio_devs[my_dev]->dmachan1 = fudge;
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dsp_count = 0;
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dsp_cleanup();
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if (dsp_16bit)
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sb_dsp_command(0xd5); /* Halt DMA until trigger() is called */
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else
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sb_dsp_command(0xd0); /* Halt DMA until trigger() is called */
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trigger_bits = 0;
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return 0;
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}
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static void
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sb16_dsp_trigger(int dev, int bits)
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{
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if (bits != 0)
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bits = 1;
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if (bits == trigger_bits) /* No change */
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return;
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trigger_bits = bits;
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if (!bits)
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sb_dsp_command(0xd0); /* Halt DMA */
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else if (bits & irq_mode)
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sb_dsp_command(0xd4); /* Continue DMA */
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}
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static void
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dsp_cleanup(void)
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{
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irq_mode = IMODE_NONE;
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intr_active = 0;
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}
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static void
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sb16_dsp_reset(int dev)
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{
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u_long flags;
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flags = splhigh();
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sb_reset_dsp();
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dsp_cleanup();
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splx(flags);
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}
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static void
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sb16_dsp_halt(int dev)
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{
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if (dsp_16bit) {
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sb_dsp_command01(0xd9);
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sb_dsp_command01(0xd5);
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} else {
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sb_dsp_command01(0xda);
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sb_dsp_command01(0xd0);
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}
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}
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static void
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set_irq_hw(int level)
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{
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int ival;
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switch (level) {
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case 5:
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ival = 2;
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break;
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case 7:
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ival = 4;
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break;
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case 9:
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ival = 1;
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break;
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case 10:
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ival = 8;
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break;
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default:
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printf("SB16_IRQ_LEVEL %d does not exist\n", level);
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return;
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}
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sb_setmixer(IRQ_NR, ival);
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}
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void
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sb16_dsp_init(struct address_info * hw_config)
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{
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if (sbc_major < 4)
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return; /* Not a SB16 */
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snprintf(sb16_dsp_operations.name, sizeof(sb16_dsp_operations.name),
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"SoundBlaster 16 %d.%d", sbc_major, sbc_minor);
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conf_printf(sb16_dsp_operations.name, hw_config);
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if (num_audiodevs < MAX_AUDIO_DEV) {
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audio_devs[my_dev = num_audiodevs++] = &sb16_dsp_operations;
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audio_devs[my_dev]->dmachan1 = dma8;
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audio_devs[my_dev]->buffsize = DSP_BUFFSIZE;
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} else
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printf("SB: Too many DSP devices available\n");
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sb16_dsp_ok = 1;
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return;
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}
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int
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sb16_dsp_detect(struct address_info * hw_config)
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{
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struct address_info *sb_config;
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if (sb16_dsp_ok)
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return 1; /* Can't drive two cards */
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if (!(sb_config = sound_getconf(SNDCARD_SB))) {
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printf("SB16 Error: Plain SB not configured\n");
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return 0;
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}
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/*
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* sb_setmixer(OPSW,0xf); if(sb_getmixer(OPSW)!=0xf) return 0;
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*/
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if (!sb_reset_dsp())
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return 0;
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if (sbc_major < 4) /* Set by the plain SB driver */
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return 0; /* Not a SB16 */
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if (hw_config->dma < 4)
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if (hw_config->dma != sb_config->dma) {
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printf("SB16 Error: Invalid DMA channel %d/%d\n",
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sb_config->dma, hw_config->dma);
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return 0;
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}
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dma16 = hw_config->dma;
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dma8 = sb_config->dma;
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/* hw_config->irq = 0; sb_config->irq;
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hw_config->io_base = sb_config->io_base;
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*/
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set_irq_hw(sb_config->irq);
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sb_setmixer(DMA_NR, (1 << hw_config->dma) | (1 << sb_config->dma));
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DEB(printf("SoundBlaster 16: IRQ %d DMA %d OK\n",
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sb_config->irq, hw_config->dma));
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/*
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* dsp_showmessage(0xe3,99);
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*/
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sb16_dsp_ok = 1;
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return 1;
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}
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void
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sb16_dsp_interrupt(int unused)
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{
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int data;
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data = inb(DSP_DATA_AVL16); /* Interrupt acknowledge */
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if (intr_active)
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switch (irq_mode) {
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case IMODE_OUTPUT:
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DMAbuf_outputintr(my_dev, 1);
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break;
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case IMODE_INPUT:
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DMAbuf_inputintr(my_dev);
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break;
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default:
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printf("SoundBlaster: Unexpected interrupt\n");
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}
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}
|
|
#endif
|