Merge branch 'topic/msnd' into for-linus

1 files changed, 180 insertions, 0 deletions

diff --git a/sound/isa/msnd/msnd_midi.c b/sound/isa/msnd/msnd_midi.c
new file mode 100644
index 000000000000..cb9aa4c4edd0
--- /dev/null
+++ b/sound/isa/msnd/msnd_midi.c
@@ -0,0 +1,180 @@
+/*
+ *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
+ *  Copyright (c) 2009 by Krzysztof Helt
+ *  Routines for control of MPU-401 in UART mode
+ *
+ *  MPU-401 supports UART mode which is not capable generate transmit
+ *  interrupts thus output is done via polling. Also, if irq < 0, then
+ *  input is done also via polling. Do not expect good performance.
+ *
+ *
+ *   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/io.h>
+#include <linux/delay.h>
+#include <linux/ioport.h>
+#include <linux/errno.h>
+#include <sound/core.h>
+#include <sound/rawmidi.h>
+
+#include "msnd.h"
+
+#define MSNDMIDI_MODE_BIT_INPUT         0
+#define MSNDMIDI_MODE_BIT_OUTPUT                1
+#define MSNDMIDI_MODE_BIT_INPUT_TRIGGER 2
+#define MSNDMIDI_MODE_BIT_OUTPUT_TRIGGER        3
+
+struct snd_msndmidi {
+        struct snd_msnd *dev;
+
+        unsigned long mode;             /* MSNDMIDI_MODE_XXXX */
+
+        struct snd_rawmidi_substream *substream_input;
+
+        spinlock_t input_lock;
+};
+
+/*
+ * input/output open/close - protected by open_mutex in rawmidi.c
+ */
+static int snd_msndmidi_input_open(struct snd_rawmidi_substream *substream)
+{
+        struct snd_msndmidi *mpu;
+
+        snd_printdd("snd_msndmidi_input_open()\n");
+
+        mpu = substream->rmidi->private_data;
+
+        mpu->substream_input = substream;
+
+        snd_msnd_enable_irq(mpu->dev);
+
+        snd_msnd_send_dsp_cmd(mpu->dev, HDEX_MIDI_IN_START);
+        set_bit(MSNDMIDI_MODE_BIT_INPUT, &mpu->mode);
+        return 0;
+}
+
+static int snd_msndmidi_input_close(struct snd_rawmidi_substream *substream)
+{
+        struct snd_msndmidi *mpu;
+
+        mpu = substream->rmidi->private_data;
+        snd_msnd_send_dsp_cmd(mpu->dev, HDEX_MIDI_IN_STOP);
+        clear_bit(MSNDMIDI_MODE_BIT_INPUT, &mpu->mode);
+        mpu->substream_input = NULL;
+        snd_msnd_disable_irq(mpu->dev);
+        return 0;
+}
+
+static void snd_msndmidi_input_drop(struct snd_msndmidi *mpu)
+{
+        u16 tail;
+
+        tail = readw(mpu->dev->MIDQ + JQS_wTail);
+        writew(tail, mpu->dev->MIDQ + JQS_wHead);
+}
+
+/*
+ * trigger input
+ */
+static void snd_msndmidi_input_trigger(struct snd_rawmidi_substream *substream,
+                                        int up)
+{
+        unsigned long flags;
+        struct snd_msndmidi *mpu;
+
+        snd_printdd("snd_msndmidi_input_trigger(, %i)\n", up);
+
+        mpu = substream->rmidi->private_data;
+        spin_lock_irqsave(&mpu->input_lock, flags);
+        if (up) {
+                if (!test_and_set_bit(MSNDMIDI_MODE_BIT_INPUT_TRIGGER,
+                                      &mpu->mode))
+                        snd_msndmidi_input_drop(mpu);
+        } else {
+                clear_bit(MSNDMIDI_MODE_BIT_INPUT_TRIGGER, &mpu->mode);
+        }
+        spin_unlock_irqrestore(&mpu->input_lock, flags);
+        if (up)
+                snd_msndmidi_input_read(mpu);
+}
+
+void snd_msndmidi_input_read(void *mpuv)
+{
+        unsigned long flags;
+        struct snd_msndmidi *mpu = mpuv;
+        void *pwMIDQData = mpu->dev->mappedbase + MIDQ_DATA_BUFF;
+
+        spin_lock_irqsave(&mpu->input_lock, flags);
+        while (readw(mpu->dev->MIDQ + JQS_wTail) !=
+               readw(mpu->dev->MIDQ + JQS_wHead)) {
+                u16 wTmp, val;
+                val = readw(pwMIDQData + 2 * readw(mpu->dev->MIDQ + JQS_wHead));
+
+                        if (test_bit(MSNDMIDI_MODE_BIT_INPUT_TRIGGER,
+                                     &mpu->mode))
+                                snd_rawmidi_receive(mpu->substream_input,
+                                                    (unsigned char *)&val, 1);
+
+                wTmp = readw(mpu->dev->MIDQ + JQS_wHead) + 1;
+                if (wTmp > readw(mpu->dev->MIDQ + JQS_wSize))
+                        writew(0,  mpu->dev->MIDQ + JQS_wHead);
+                else
+                        writew(wTmp,  mpu->dev->MIDQ + JQS_wHead);
+        }
+        spin_unlock_irqrestore(&mpu->input_lock, flags);
+}
+EXPORT_SYMBOL(snd_msndmidi_input_read);
+
+static struct snd_rawmidi_ops snd_msndmidi_input = {
+        .open =         snd_msndmidi_input_open,
+        .close =        snd_msndmidi_input_close,
+        .trigger =      snd_msndmidi_input_trigger,
+};
+
+static void snd_msndmidi_free(struct snd_rawmidi *rmidi)
+{
+        struct snd_msndmidi *mpu = rmidi->private_data;
+        kfree(mpu);
+}
+
+int snd_msndmidi_new(struct snd_card *card, int device)
+{
+        struct snd_msnd *chip = card->private_data;
+        struct snd_msndmidi *mpu;
+        struct snd_rawmidi *rmidi;
+        int err;
+
+        err = snd_rawmidi_new(card, "MSND-MIDI", device, 1, 1, &rmidi);
+        if (err < 0)
+                return err;
+        mpu = kcalloc(1, sizeof(*mpu), GFP_KERNEL);
+        if (mpu == NULL) {
+                snd_device_free(card, rmidi);
+                return -ENOMEM;
+        }
+        mpu->dev = chip;
+        chip->msndmidi_mpu = mpu;
+        rmidi->private_data = mpu;
+        rmidi->private_free = snd_msndmidi_free;
+        spin_lock_init(&mpu->input_lock);
+        strcpy(rmidi->name, "MSND MIDI");
+        snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
+                            &snd_msndmidi_input);
+        rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;
+        return 0;
+}