ae28ee13b4
Amancio. There is some SoundSource support here that is primitive and probably doesn't work, but I'll let the two submitters let me know how my integration of that was since I don't have this card to test. I've only tested this on my GUS MAX since it's all I have. This all probably needs to be re-done anyway since we're widely variant from the original VOXWARE source in the current layout. Submitted by: Amancio Hasty and Jim Lowe Obtained from: Hannu Savolainen
305 lines
6.4 KiB
C
305 lines
6.4 KiB
C
/*
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* sound/sb16_midi.c
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*
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* The low level driver for the MPU-401 UART emulation of the SB16.
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*
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* Copyright by Hannu Savolainen 1993
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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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#include "sound_config.h"
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#ifdef CONFIGURE_SOUNDCARD
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#if !defined(EXCLUDE_SB) && !defined(EXCLUDE_SB16) && !defined(EXCLUDE_MIDI)
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#include "sb.h"
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#define DATAPORT (sb16midi_base)
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#define COMDPORT (sb16midi_base+1)
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#define STATPORT (sb16midi_base+1)
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#define sb16midi_status() INB(STATPORT)
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#define input_avail() (!(sb16midi_status()&INPUT_AVAIL))
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#define output_ready() (!(sb16midi_status()&OUTPUT_READY))
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#define sb16midi_cmd(cmd) OUTB(cmd, COMDPORT)
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#define sb16midi_read() INB(DATAPORT)
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#define sb16midi_write(byte) OUTB(byte, DATAPORT)
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#define OUTPUT_READY 0x40
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#define INPUT_AVAIL 0x80
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#define MPU_ACK 0xFE
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#define MPU_RESET 0xFF
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#define UART_MODE_ON 0x3F
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static int sb16midi_opened = 0;
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static int sb16midi_base = 0x330;
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static int sb16midi_detected = 0;
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static int my_dev;
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extern int sbc_base;
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static int reset_sb16midi (void);
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static void (*midi_input_intr) (int dev, unsigned char data);
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static void
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sb16midi_input_loop (void)
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{
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while (input_avail ())
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{
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unsigned char c = sb16midi_read ();
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if (sb16midi_opened & OPEN_READ)
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midi_input_intr (my_dev, c);
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}
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}
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void
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sb16midiintr (int unit)
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{
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if (input_avail ())
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sb16midi_input_loop ();
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}
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static int
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sb16midi_open (int dev, int mode,
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void (*input) (int dev, unsigned char data),
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void (*output) (int dev)
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)
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{
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if (sb16midi_opened)
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{
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return RET_ERROR (EBUSY);
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}
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sb16midi_input_loop ();
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midi_input_intr = input;
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sb16midi_opened = mode;
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return 0;
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}
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static void
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sb16midi_close (int dev)
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{
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sb16midi_opened = 0;
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}
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static int
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sb16midi_out (int dev, unsigned char midi_byte)
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{
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int timeout;
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unsigned long flags;
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/*
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* Test for input since pending input seems to block the output.
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*/
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DISABLE_INTR (flags);
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if (input_avail ())
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sb16midi_input_loop ();
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RESTORE_INTR (flags);
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/*
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* Sometimes it takes about 13000 loops before the output becomes ready
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* (After reset). Normally it takes just about 10 loops.
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*/
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for (timeout = 30000; timeout > 0 && !output_ready (); timeout--); /*
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* Wait
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*/
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if (!output_ready ())
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{
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printk ("MPU-401: Timeout\n");
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return 0;
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}
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sb16midi_write (midi_byte);
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return 1;
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}
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static int
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sb16midi_start_read (int dev)
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{
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return 0;
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}
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static int
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sb16midi_end_read (int dev)
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{
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return 0;
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}
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static int
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sb16midi_ioctl (int dev, unsigned cmd, unsigned arg)
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{
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return RET_ERROR (EINVAL);
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}
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static void
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sb16midi_kick (int dev)
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{
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}
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static int
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sb16midi_buffer_status (int dev)
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{
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return 0; /*
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* No data in buffers
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*/
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}
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#define MIDI_SYNTH_NAME "SoundBlaster 16 Midi"
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#define MIDI_SYNTH_CAPS SYNTH_CAP_INPUT
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#include "midi_synth.h"
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static struct midi_operations sb16midi_operations =
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{
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{"SoundBlaster 16 Midi", 0, 0, SNDCARD_SB16MIDI},
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&std_midi_synth,
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{0},
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sb16midi_open,
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sb16midi_close,
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sb16midi_ioctl,
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sb16midi_out,
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sb16midi_start_read,
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sb16midi_end_read,
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sb16midi_kick,
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NULL,
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sb16midi_buffer_status,
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NULL
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};
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long
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attach_sb16midi (long mem_start, struct address_info *hw_config)
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{
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int ok, timeout;
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unsigned long flags;
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sb16midi_base = hw_config->io_base;
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if (!sb16midi_detected)
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return RET_ERROR (EIO);
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DISABLE_INTR (flags);
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for (timeout = 30000; timeout < 0 && !output_ready (); timeout--); /*
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* Wait
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*/
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sb16midi_cmd (UART_MODE_ON);
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ok = 0;
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for (timeout = 50000; timeout > 0 && !ok; timeout--)
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if (input_avail ())
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if (sb16midi_read () == MPU_ACK)
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ok = 1;
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RESTORE_INTR (flags);
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if (num_midis >= MAX_MIDI_DEV)
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{
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printk ("Sound: Too many midi devices detected\n");
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return mem_start;
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}
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printk (" <SoundBlaster MPU-401>");
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std_midi_synth.midi_dev = my_dev = num_midis;
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midi_devs[num_midis++] = &sb16midi_operations;
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return mem_start;
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}
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static int
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reset_sb16midi (void)
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{
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unsigned long flags;
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int ok, timeout, n;
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/*
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* Send the RESET command. Try again if no success at the first time.
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*/
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ok = 0;
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DISABLE_INTR (flags);
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for (n = 0; n < 2 && !ok; n++)
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{
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for (timeout = 30000; timeout < 0 && !output_ready (); timeout--); /*
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* Wait
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*/
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sb16midi_cmd (MPU_RESET); /*
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* Send MPU-401 RESET Command
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*/
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/*
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* Wait at least 25 msec. This method is not accurate so let's make the
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* loop bit longer. Cannot sleep since this is called during boot.
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*/
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for (timeout = 50000; timeout > 0 && !ok; timeout--)
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if (input_avail ())
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if (sb16midi_read () == MPU_ACK)
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ok = 1;
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}
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sb16midi_opened = 0;
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if (ok)
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sb16midi_input_loop (); /*
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* Flush input before enabling interrupts
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*/
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RESTORE_INTR (flags);
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return ok;
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}
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int
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probe_sb16midi (struct address_info *hw_config)
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{
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int ok = 0;
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extern int sbc_major;
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if (sbc_major < 4)
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return 0; /* Not a SB16 */
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sb16midi_base = hw_config->io_base;
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if (sb_get_irq () < 0)
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return 0;
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ok = reset_sb16midi ();
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sb16midi_detected = ok;
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return ok;
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}
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#endif
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#endif
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