[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 000000000000..f439d14876b0
--- /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;
+}
+