[ALSA] snd-ca0106: Add midi support.
Modules: PCI drivers,CA0106 driver
Author: Tilman Kranz <tilde@tk-sls.de>
Signed-off-by: James Courtier-Dutton <James@superbug.co.uk>
diff --git a/sound/pci/ca0106/ca_midi.c b/sound/pci/ca0106/ca_midi.c
new file mode 100644
index 0000000..f439d14
--- /dev/null
+++ b/sound/pci/ca0106/ca_midi.c
@@ -0,0 +1,304 @@
+/*
+ * Copyright 10/16/2005 Tilman Kranz <tilde@tk-sls.de>
+ * Creative Audio MIDI, for the CA0106 Driver
+ * Version: 0.0.1
+ *
+ * Changelog:
+ * Implementation is based on mpu401 and emu10k1x and
+ * tested with ca0106.
+ *
+ * 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
+ *
+ *
+ */
+
+#include <linux/spinlock.h>
+#include <sound/driver.h>
+#include <sound/core.h>
+#include <sound/rawmidi.h>
+
+#include "ca_midi.h"
+
+#define ca_midi_write_data(midi, data) midi->write(midi, data, 0)
+#define ca_midi_write_cmd(midi, data) midi->write(midi, data, 1)
+#define ca_midi_read_data(midi) midi->read(midi, 0)
+#define ca_midi_read_stat(midi) midi->read(midi, 1)
+#define ca_midi_input_avail(midi) (!(ca_midi_read_stat(midi) & midi->input_avail))
+#define ca_midi_output_ready(midi) (!(ca_midi_read_stat(midi) & midi->output_ready))
+
+static void ca_midi_clear_rx(ca_midi_t *midi)
+{
+ int timeout = 100000;
+ for (; timeout > 0 && ca_midi_input_avail(midi); timeout--)
+ ca_midi_read_data(midi);
+#ifdef CONFIG_SND_DEBUG
+ if (timeout <= 0)
+ snd_printk(KERN_ERR "ca_midi_clear_rx: timeout (status = 0x%x)\n", ca_midi_read_stat(midi));
+#endif
+}
+
+void ca_midi_interrupt(ca_midi_t *midi, unsigned int status) {
+ unsigned char byte;
+
+ if (midi->rmidi == NULL) {
+ midi->interrupt_disable(midi,midi->tx_enable | midi->rx_enable);
+ return;
+ }
+
+ spin_lock(&midi->input_lock);
+ if ((status & midi->ipr_rx) && ca_midi_input_avail(midi)) {
+ if (!(midi->midi_mode & CA_MIDI_MODE_INPUT)) {
+ ca_midi_clear_rx(midi);
+ } else {
+ byte = ca_midi_read_data(midi);
+ if(midi->substream_input)
+ snd_rawmidi_receive(midi->substream_input, &byte, 1);
+
+
+ }
+ }
+ spin_unlock(&midi->input_lock);
+
+ spin_lock(&midi->output_lock);
+ if ((status & midi->ipr_tx) && ca_midi_output_ready(midi)) {
+ if (midi->substream_output &&
+ snd_rawmidi_transmit(midi->substream_output, &byte, 1) == 1) {
+ ca_midi_write_data(midi, byte);
+ } else {
+ midi->interrupt_disable(midi,midi->tx_enable);
+ }
+ }
+ spin_unlock(&midi->output_lock);
+
+}
+
+static void ca_midi_cmd(ca_midi_t *midi, unsigned char cmd, int ack)
+{
+ unsigned long flags;
+ int timeout, ok;
+
+ spin_lock_irqsave(&midi->input_lock, flags);
+ ca_midi_write_data(midi, 0x00);
+ /* ca_midi_clear_rx(midi); */
+
+ ca_midi_write_cmd(midi, cmd);
+ if (ack) {
+ ok = 0;
+ timeout = 10000;
+ while (!ok && timeout-- > 0) {
+ if (ca_midi_input_avail(midi)) {
+ if (ca_midi_read_data(midi) == midi->ack)
+ ok = 1;
+ }
+ }
+ if (!ok && ca_midi_read_data(midi) == midi->ack)
+ ok = 1;
+ } else {
+ ok = 1;
+ }
+ spin_unlock_irqrestore(&midi->input_lock, flags);
+ if (!ok)
+ snd_printk(KERN_ERR "ca_midi_cmd: 0x%x failed at 0x%x (status = 0x%x, data = 0x%x)!!!\n",
+ cmd,
+ midi->get_dev_id_port(midi->dev_id),
+ ca_midi_read_stat(midi),
+ ca_midi_read_data(midi));
+}
+
+static int ca_midi_input_open(snd_rawmidi_substream_t * substream)
+{
+ ca_midi_t *midi = (ca_midi_t *)substream->rmidi->private_data;
+ unsigned long flags;
+
+ snd_assert(midi->dev_id, return -ENXIO);
+ spin_lock_irqsave(&midi->open_lock, flags);
+ midi->midi_mode |= CA_MIDI_MODE_INPUT;
+ midi->substream_input = substream;
+ if (!(midi->midi_mode & CA_MIDI_MODE_OUTPUT)) {
+ spin_unlock_irqrestore(&midi->open_lock, flags);
+ ca_midi_cmd(midi, midi->reset, 1);
+ ca_midi_cmd(midi, midi->enter_uart, 1);
+ } else {
+ spin_unlock_irqrestore(&midi->open_lock, flags);
+ }
+ return 0;
+}
+
+static int ca_midi_output_open(snd_rawmidi_substream_t * substream)
+{
+ ca_midi_t *midi = (ca_midi_t *)substream->rmidi->private_data;
+ unsigned long flags;
+
+ snd_assert(midi->dev_id, return -ENXIO);
+ spin_lock_irqsave(&midi->open_lock, flags);
+ midi->midi_mode |= CA_MIDI_MODE_OUTPUT;
+ midi->substream_output = substream;
+ if (!(midi->midi_mode & CA_MIDI_MODE_INPUT)) {
+ spin_unlock_irqrestore(&midi->open_lock, flags);
+ ca_midi_cmd(midi, midi->reset, 1);
+ ca_midi_cmd(midi, midi->enter_uart, 1);
+ } else {
+ spin_unlock_irqrestore(&midi->open_lock, flags);
+ }
+ return 0;
+}
+
+static int ca_midi_input_close(snd_rawmidi_substream_t * substream)
+{
+ ca_midi_t *midi = (ca_midi_t *)substream->rmidi->private_data;
+ unsigned long flags;
+
+ snd_assert(midi->dev_id, return -ENXIO);
+ spin_lock_irqsave(&midi->open_lock, flags);
+ midi->interrupt_disable(midi,midi->rx_enable);
+ midi->midi_mode &= ~CA_MIDI_MODE_INPUT;
+ midi->substream_input = NULL;
+ if (!(midi->midi_mode & CA_MIDI_MODE_OUTPUT)) {
+ spin_unlock_irqrestore(&midi->open_lock, flags);
+ ca_midi_cmd(midi, midi->reset, 0);
+ } else {
+ spin_unlock_irqrestore(&midi->open_lock, flags);
+ }
+ return 0;
+}
+
+static int ca_midi_output_close(snd_rawmidi_substream_t * substream)
+{
+ ca_midi_t *midi = (ca_midi_t *)substream->rmidi->private_data;
+ unsigned long flags;
+ snd_assert(midi->dev_id, return -ENXIO);
+
+ spin_lock_irqsave(&midi->open_lock, flags);
+
+ midi->interrupt_disable(midi,midi->tx_enable);
+ midi->midi_mode &= ~CA_MIDI_MODE_OUTPUT;
+ midi->substream_output = NULL;
+
+ if (!(midi->midi_mode & CA_MIDI_MODE_INPUT)) {
+ spin_unlock_irqrestore(&midi->open_lock, flags);
+ ca_midi_cmd(midi, midi->reset, 0);
+ } else {
+ spin_unlock_irqrestore(&midi->open_lock, flags);
+ }
+ return 0;
+}
+
+static void ca_midi_input_trigger(snd_rawmidi_substream_t * substream, int up)
+{
+ ca_midi_t *midi = (ca_midi_t *)substream->rmidi->private_data;
+ snd_assert(midi->dev_id, return);
+
+ if (up) {
+ midi->interrupt_enable(midi,midi->rx_enable);
+ } else {
+ midi->interrupt_disable(midi, midi->rx_enable);
+ }
+}
+
+static void ca_midi_output_trigger(snd_rawmidi_substream_t * substream, int up)
+{
+ ca_midi_t *midi = (ca_midi_t *)substream->rmidi->private_data;
+ unsigned long flags;
+
+ snd_assert(midi->dev_id, return);
+
+ if (up) {
+ int max = 4;
+ unsigned char byte;
+
+ spin_lock_irqsave(&midi->output_lock, flags);
+
+ /* try to send some amount of bytes here before interrupts */
+ while (max > 0) {
+ if (ca_midi_output_ready(midi)) {
+ if (!(midi->midi_mode & CA_MIDI_MODE_OUTPUT) ||
+ snd_rawmidi_transmit(substream, &byte, 1) != 1) {
+ /* no more data */
+ spin_unlock_irqrestore(&midi->output_lock, flags);
+ return;
+ }
+ ca_midi_write_data(midi, byte);
+ max--;
+ } else {
+ break;
+ }
+ }
+
+ spin_unlock_irqrestore(&midi->output_lock, flags);
+ midi->interrupt_enable(midi,midi->tx_enable);
+
+ } else {
+ midi->interrupt_disable(midi,midi->tx_enable);
+ }
+}
+
+static snd_rawmidi_ops_t ca_midi_output =
+{
+ .open = ca_midi_output_open,
+ .close = ca_midi_output_close,
+ .trigger = ca_midi_output_trigger,
+};
+
+static snd_rawmidi_ops_t ca_midi_input =
+{
+ .open = ca_midi_input_open,
+ .close = ca_midi_input_close,
+ .trigger = ca_midi_input_trigger,
+};
+
+void ca_midi_free(ca_midi_t *midi) {
+ midi->interrupt = NULL;
+ midi->interrupt_enable = NULL;
+ midi->interrupt_disable = NULL;
+ midi->read = NULL;
+ midi->write = NULL;
+ midi->get_dev_id_card = NULL;
+ midi->get_dev_id_port = NULL;
+ midi->rmidi = NULL;
+}
+
+static void ca_rmidi_free(snd_rawmidi_t *rmidi)
+{
+ ca_midi_free((ca_midi_t *)rmidi->private_data);
+}
+
+int __devinit ca_midi_init(void *dev_id, ca_midi_t *midi, int device, char *name)
+{
+ snd_rawmidi_t *rmidi;
+ int err;
+
+ if ((err = snd_rawmidi_new(midi->get_dev_id_card(midi->dev_id), name, device, 1, 1, &rmidi)) < 0)
+ return err;
+
+ midi->dev_id = dev_id;
+ midi->interrupt = ca_midi_interrupt;
+
+ spin_lock_init(&midi->open_lock);
+ spin_lock_init(&midi->input_lock);
+ spin_lock_init(&midi->output_lock);
+
+ strcpy(rmidi->name, name);
+ snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &ca_midi_output);
+ snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &ca_midi_input);
+ rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT |
+ SNDRV_RAWMIDI_INFO_INPUT |
+ SNDRV_RAWMIDI_INFO_DUPLEX;
+ rmidi->private_data = midi;
+ rmidi->private_free = ca_rmidi_free;
+
+ midi->rmidi = rmidi;
+ return 0;
+}
+