--- /dev/null
+/*
+ * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
+ * Routines for control of SoundBlaster cards - MIDI interface
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * --
+ *
+ * Sun May 9 22:54:38 BST 1999 George David Morrison <gdm@gedamo.demon.co.uk>
+ * Fixed typo in snd_sb8dsp_midi_new_device which prevented midi from
+ * working.
+ *
+ * Sun May 11 12:34:56 UTC 2003 Clemens Ladisch <clemens@ladisch.de>
+ * Added full duplex UART mode for DSP version 2.0 and later.
+ */
+
+#include <linux/io.h>
+#include <linux/time.h>
+#include <sound/core.h>
+#include <sound/sb.h>
+
+
+irqreturn_t snd_sb8dsp_midi_interrupt(struct snd_sb *chip)
+{
+ struct snd_rawmidi *rmidi;
+ int max = 64;
+ char byte;
+
+ if (!chip)
+ return IRQ_NONE;
+
+ rmidi = chip->rmidi;
+ if (!rmidi) {
+ inb(SBP(chip, DATA_AVAIL)); /* ack interrupt */
+ return IRQ_NONE;
+ }
+
+ spin_lock(&chip->midi_input_lock);
+ while (max-- > 0) {
+ if (inb(SBP(chip, DATA_AVAIL)) & 0x80) {
+ byte = inb(SBP(chip, READ));
+ if (chip->open & SB_OPEN_MIDI_INPUT_TRIGGER) {
+ snd_rawmidi_receive(chip->midi_substream_input, &byte, 1);
+ }
+ }
+ }
+ spin_unlock(&chip->midi_input_lock);
+ return IRQ_HANDLED;
+}
+
+static int snd_sb8dsp_midi_input_open(struct snd_rawmidi_substream *substream)
+{
+ unsigned long flags;
+ struct snd_sb *chip;
+ unsigned int valid_open_flags;
+
+ chip = substream->rmidi->private_data;
+ valid_open_flags = chip->hardware >= SB_HW_20
+ ? SB_OPEN_MIDI_OUTPUT | SB_OPEN_MIDI_OUTPUT_TRIGGER : 0;
+ spin_lock_irqsave(&chip->open_lock, flags);
+ if (chip->open & ~valid_open_flags) {
+ spin_unlock_irqrestore(&chip->open_lock, flags);
+ return -EAGAIN;
+ }
+ chip->open |= SB_OPEN_MIDI_INPUT;
+ chip->midi_substream_input = substream;
+ if (!(chip->open & SB_OPEN_MIDI_OUTPUT)) {
+ spin_unlock_irqrestore(&chip->open_lock, flags);
+ snd_sbdsp_reset(chip); /* reset DSP */
+ if (chip->hardware >= SB_HW_20)
+ snd_sbdsp_command(chip, SB_DSP_MIDI_UART_IRQ);
+ } else {
+ spin_unlock_irqrestore(&chip->open_lock, flags);
+ }
+ return 0;
+}
+
+static int snd_sb8dsp_midi_output_open(struct snd_rawmidi_substream *substream)
+{
+ unsigned long flags;
+ struct snd_sb *chip;
+ unsigned int valid_open_flags;
+
+ chip = substream->rmidi->private_data;
+ valid_open_flags = chip->hardware >= SB_HW_20
+ ? SB_OPEN_MIDI_INPUT | SB_OPEN_MIDI_INPUT_TRIGGER : 0;
+ spin_lock_irqsave(&chip->open_lock, flags);
+ if (chip->open & ~valid_open_flags) {
+ spin_unlock_irqrestore(&chip->open_lock, flags);
+ return -EAGAIN;
+ }
+ chip->open |= SB_OPEN_MIDI_OUTPUT;
+ chip->midi_substream_output = substream;
+ if (!(chip->open & SB_OPEN_MIDI_INPUT)) {
+ spin_unlock_irqrestore(&chip->open_lock, flags);
+ snd_sbdsp_reset(chip); /* reset DSP */
+ if (chip->hardware >= SB_HW_20)
+ snd_sbdsp_command(chip, SB_DSP_MIDI_UART_IRQ);
+ } else {
+ spin_unlock_irqrestore(&chip->open_lock, flags);
+ }
+ return 0;
+}
+
+static int snd_sb8dsp_midi_input_close(struct snd_rawmidi_substream *substream)
+{
+ unsigned long flags;
+ struct snd_sb *chip;
+
+ chip = substream->rmidi->private_data;
+ spin_lock_irqsave(&chip->open_lock, flags);
+ chip->open &= ~(SB_OPEN_MIDI_INPUT | SB_OPEN_MIDI_INPUT_TRIGGER);
+ chip->midi_substream_input = NULL;
+ if (!(chip->open & SB_OPEN_MIDI_OUTPUT)) {
+ spin_unlock_irqrestore(&chip->open_lock, flags);
+ snd_sbdsp_reset(chip); /* reset DSP */
+ } else {
+ spin_unlock_irqrestore(&chip->open_lock, flags);
+ }
+ return 0;
+}
+
+static int snd_sb8dsp_midi_output_close(struct snd_rawmidi_substream *substream)
+{
+ unsigned long flags;
+ struct snd_sb *chip;
+
+ chip = substream->rmidi->private_data;
+ spin_lock_irqsave(&chip->open_lock, flags);
+ chip->open &= ~(SB_OPEN_MIDI_OUTPUT | SB_OPEN_MIDI_OUTPUT_TRIGGER);
+ chip->midi_substream_output = NULL;
+ if (!(chip->open & SB_OPEN_MIDI_INPUT)) {
+ spin_unlock_irqrestore(&chip->open_lock, flags);
+ snd_sbdsp_reset(chip); /* reset DSP */
+ } else {
+ spin_unlock_irqrestore(&chip->open_lock, flags);
+ }
+ return 0;
+}
+
+static void snd_sb8dsp_midi_input_trigger(struct snd_rawmidi_substream *substream, int up)
+{
+ unsigned long flags;
+ struct snd_sb *chip;
+
+ chip = substream->rmidi->private_data;
+ spin_lock_irqsave(&chip->open_lock, flags);
+ if (up) {
+ if (!(chip->open & SB_OPEN_MIDI_INPUT_TRIGGER)) {
+ if (chip->hardware < SB_HW_20)
+ snd_sbdsp_command(chip, SB_DSP_MIDI_INPUT_IRQ);
+ chip->open |= SB_OPEN_MIDI_INPUT_TRIGGER;
+ }
+ } else {
+ if (chip->open & SB_OPEN_MIDI_INPUT_TRIGGER) {
+ if (chip->hardware < SB_HW_20)
+ snd_sbdsp_command(chip, SB_DSP_MIDI_INPUT_IRQ);
+ chip->open &= ~SB_OPEN_MIDI_INPUT_TRIGGER;
+ }
+ }
+ spin_unlock_irqrestore(&chip->open_lock, flags);
+}
+
+static void snd_sb8dsp_midi_output_write(struct snd_rawmidi_substream *substream)
+{
+ unsigned long flags;
+ struct snd_sb *chip;
+ char byte;
+ int max = 32;
+
+ /* how big is Tx FIFO? */
+ chip = substream->rmidi->private_data;
+ while (max-- > 0) {
+ spin_lock_irqsave(&chip->open_lock, flags);
+ if (snd_rawmidi_transmit_peek(substream, &byte, 1) != 1) {
+ chip->open &= ~SB_OPEN_MIDI_OUTPUT_TRIGGER;
+ del_timer(&chip->midi_timer);
+ spin_unlock_irqrestore(&chip->open_lock, flags);
+ break;
+ }
+ if (chip->hardware >= SB_HW_20) {
+ int timeout = 8;
+ while ((inb(SBP(chip, STATUS)) & 0x80) != 0 && --timeout > 0)
+ ;
+ if (timeout == 0) {
+ /* Tx FIFO full - try again later */
+ spin_unlock_irqrestore(&chip->open_lock, flags);
+ break;
+ }
+ outb(byte, SBP(chip, WRITE));
+ } else {
+ snd_sbdsp_command(chip, SB_DSP_MIDI_OUTPUT);
+ snd_sbdsp_command(chip, byte);
+ }
+ snd_rawmidi_transmit_ack(substream, 1);
+ spin_unlock_irqrestore(&chip->open_lock, flags);
+ }
+}
+
+static void snd_sb8dsp_midi_output_timer(unsigned long data)
+{
+ struct snd_rawmidi_substream *substream = (struct snd_rawmidi_substream *) data;
+ struct snd_sb * chip = substream->rmidi->private_data;
+ unsigned long flags;
+
+ spin_lock_irqsave(&chip->open_lock, flags);
+ mod_timer(&chip->midi_timer, 1 + jiffies);
+ spin_unlock_irqrestore(&chip->open_lock, flags);
+ snd_sb8dsp_midi_output_write(substream);
+}
+
+static void snd_sb8dsp_midi_output_trigger(struct snd_rawmidi_substream *substream, int up)
+{
+ unsigned long flags;
+ struct snd_sb *chip;
+
+ chip = substream->rmidi->private_data;
+ spin_lock_irqsave(&chip->open_lock, flags);
+ if (up) {
+ if (!(chip->open & SB_OPEN_MIDI_OUTPUT_TRIGGER)) {
+ setup_timer(&chip->midi_timer,
+ snd_sb8dsp_midi_output_timer,
+ (unsigned long) substream);
+ mod_timer(&chip->midi_timer, 1 + jiffies);
+ chip->open |= SB_OPEN_MIDI_OUTPUT_TRIGGER;
+ }
+ } else {
+ if (chip->open & SB_OPEN_MIDI_OUTPUT_TRIGGER) {
+ chip->open &= ~SB_OPEN_MIDI_OUTPUT_TRIGGER;
+ }
+ }
+ spin_unlock_irqrestore(&chip->open_lock, flags);
+
+ if (up)
+ snd_sb8dsp_midi_output_write(substream);
+}
+
+static struct snd_rawmidi_ops snd_sb8dsp_midi_output =
+{
+ .open = snd_sb8dsp_midi_output_open,
+ .close = snd_sb8dsp_midi_output_close,
+ .trigger = snd_sb8dsp_midi_output_trigger,
+};
+
+static struct snd_rawmidi_ops snd_sb8dsp_midi_input =
+{
+ .open = snd_sb8dsp_midi_input_open,
+ .close = snd_sb8dsp_midi_input_close,
+ .trigger = snd_sb8dsp_midi_input_trigger,
+};
+
+int snd_sb8dsp_midi(struct snd_sb *chip, int device)
+{
+ struct snd_rawmidi *rmidi;
+ int err;
+
+ if ((err = snd_rawmidi_new(chip->card, "SB8 MIDI", device, 1, 1, &rmidi)) < 0)
+ return err;
+ strcpy(rmidi->name, "SB8 MIDI");
+ snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &snd_sb8dsp_midi_output);
+ snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &snd_sb8dsp_midi_input);
+ rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT | SNDRV_RAWMIDI_INFO_INPUT;
+ if (chip->hardware >= SB_HW_20)
+ rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;
+ rmidi->private_data = chip;
+ chip->rmidi = rmidi;
+ return 0;
+}
Code Review / kvmfornfv.git / blobdiff