sound/pci/ca0106/ca_midi.c - kernel/mindspeed - Git at Google

 /*
  *  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.
  *    mpu401: Copyright (c) by Jaroslav Kysela <perex@perex.cz>
  *    emu10k1x: Copyright (c) by Francisco Moraes <fmoraes@nc.rr.com>
  *
  *   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/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(struct snd_ca_midi *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
 }

 static void ca_midi_interrupt(struct snd_ca_midi *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(struct snd_ca_midi *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(struct snd_rawmidi_substream *substream)
 {
 	struct snd_ca_midi *midi = substream->rmidi->private_data;
 	unsigned long flags;

 	if (snd_BUG_ON(!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(struct snd_rawmidi_substream *substream)
 {
 	struct snd_ca_midi *midi = substream->rmidi->private_data;
 	unsigned long flags;

 	if (snd_BUG_ON(!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(struct snd_rawmidi_substream *substream)
 {
 	struct snd_ca_midi *midi = substream->rmidi->private_data;
 	unsigned long flags;

 	if (snd_BUG_ON(!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(struct snd_rawmidi_substream *substream)
 {
 	struct snd_ca_midi *midi = substream->rmidi->private_data;
 	unsigned long flags;

 	if (snd_BUG_ON(!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(struct snd_rawmidi_substream *substream, int up)
 {
 	struct snd_ca_midi *midi = substream->rmidi->private_data;

 	if (snd_BUG_ON(!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(struct snd_rawmidi_substream *substream, int up)
 {
 	struct snd_ca_midi *midi = substream->rmidi->private_data;
 	unsigned long flags;

 	if (snd_BUG_ON(!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 struct snd_rawmidi_ops ca_midi_output =
 {
 	.open =		ca_midi_output_open,
 	.close =	ca_midi_output_close,
 	.trigger =	ca_midi_output_trigger,
 };

 static struct snd_rawmidi_ops ca_midi_input =
 {
 	.open =		ca_midi_input_open,
 	.close =	ca_midi_input_close,
 	.trigger =	ca_midi_input_trigger,
 };

 static void ca_midi_free(struct snd_ca_midi *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(struct snd_rawmidi *rmidi)
 {
 	ca_midi_free(rmidi->private_data);
 }

 int __devinit ca_midi_init(void *dev_id, struct snd_ca_midi *midi, int device, char *name)
 {
 	struct snd_rawmidi *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;
 }
	/*
	* 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.
	* mpu401: Copyright (c) by Jaroslav Kysela <perex@perex.cz>
	* emu10k1x: Copyright (c) by Francisco Moraes <fmoraes@nc.rr.com>
	*
	* 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/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(struct snd_ca_midi *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
	}

	static void ca_midi_interrupt(struct snd_ca_midi *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(struct snd_ca_midi *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(struct snd_rawmidi_substream *substream)
	{
	struct snd_ca_midi *midi = substream->rmidi->private_data;
	unsigned long flags;

	if (snd_BUG_ON(!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(struct snd_rawmidi_substream *substream)
	{
	struct snd_ca_midi *midi = substream->rmidi->private_data;
	unsigned long flags;

	if (snd_BUG_ON(!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(struct snd_rawmidi_substream *substream)
	{
	struct snd_ca_midi *midi = substream->rmidi->private_data;
	unsigned long flags;

	if (snd_BUG_ON(!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(struct snd_rawmidi_substream *substream)
	{
	struct snd_ca_midi *midi = substream->rmidi->private_data;
	unsigned long flags;

	if (snd_BUG_ON(!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(struct snd_rawmidi_substream *substream, int up)
	{
	struct snd_ca_midi *midi = substream->rmidi->private_data;

	if (snd_BUG_ON(!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(struct snd_rawmidi_substream *substream, int up)
	{
	struct snd_ca_midi *midi = substream->rmidi->private_data;
	unsigned long flags;

	if (snd_BUG_ON(!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 struct snd_rawmidi_ops ca_midi_output =
	{
	.open = ca_midi_output_open,
	.close = ca_midi_output_close,
	.trigger = ca_midi_output_trigger,
	};

	static struct snd_rawmidi_ops ca_midi_input =
	{
	.open = ca_midi_input_open,
	.close = ca_midi_input_close,
	.trigger = ca_midi_input_trigger,
	};

	static void ca_midi_free(struct snd_ca_midi *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(struct snd_rawmidi *rmidi)
	{
	ca_midi_free(rmidi->private_data);
	}

	int __devinit ca_midi_init(void dev_id, struct snd_ca_midi midi, int device, char *name)
	{
	struct snd_rawmidi *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;
	}