[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>

1 files changed, 304 insertions, 0 deletions

diff --git a/sound/pci/ca0106/ca_midi.c b/sound/pci/ca0106/ca_midi.c
new file mode 100644
index 00000000000..f439d14876b
--- /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;
+}
+