2 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
3 * Copyright (c) 2009 by Krzysztof Helt
4 * Routines for control of MPU-401 in UART mode
6 * MPU-401 supports UART mode which is not capable generate transmit
7 * interrupts thus output is done via polling. Also, if irq < 0, then
8 * input is done also via polling. Do not expect good performance.
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
28 #include <linux/slab.h>
29 #include <linux/delay.h>
30 #include <linux/ioport.h>
31 #include <linux/errno.h>
32 #include <sound/core.h>
33 #include <sound/rawmidi.h>
37 #define MSNDMIDI_MODE_BIT_INPUT 0
38 #define MSNDMIDI_MODE_BIT_OUTPUT 1
39 #define MSNDMIDI_MODE_BIT_INPUT_TRIGGER 2
40 #define MSNDMIDI_MODE_BIT_OUTPUT_TRIGGER 3
45 unsigned long mode; /* MSNDMIDI_MODE_XXXX */
47 struct snd_rawmidi_substream *substream_input;
49 spinlock_t input_lock;
53 * input/output open/close - protected by open_mutex in rawmidi.c
55 static int snd_msndmidi_input_open(struct snd_rawmidi_substream *substream)
57 struct snd_msndmidi *mpu;
59 snd_printdd("snd_msndmidi_input_open()\n");
61 mpu = substream->rmidi->private_data;
63 mpu->substream_input = substream;
65 snd_msnd_enable_irq(mpu->dev);
67 snd_msnd_send_dsp_cmd(mpu->dev, HDEX_MIDI_IN_START);
68 set_bit(MSNDMIDI_MODE_BIT_INPUT, &mpu->mode);
72 static int snd_msndmidi_input_close(struct snd_rawmidi_substream *substream)
74 struct snd_msndmidi *mpu;
76 mpu = substream->rmidi->private_data;
77 snd_msnd_send_dsp_cmd(mpu->dev, HDEX_MIDI_IN_STOP);
78 clear_bit(MSNDMIDI_MODE_BIT_INPUT, &mpu->mode);
79 mpu->substream_input = NULL;
80 snd_msnd_disable_irq(mpu->dev);
84 static void snd_msndmidi_input_drop(struct snd_msndmidi *mpu)
88 tail = readw(mpu->dev->MIDQ + JQS_wTail);
89 writew(tail, mpu->dev->MIDQ + JQS_wHead);
95 static void snd_msndmidi_input_trigger(struct snd_rawmidi_substream *substream,
99 struct snd_msndmidi *mpu;
101 snd_printdd("snd_msndmidi_input_trigger(, %i)\n", up);
103 mpu = substream->rmidi->private_data;
104 spin_lock_irqsave(&mpu->input_lock, flags);
106 if (!test_and_set_bit(MSNDMIDI_MODE_BIT_INPUT_TRIGGER,
108 snd_msndmidi_input_drop(mpu);
110 clear_bit(MSNDMIDI_MODE_BIT_INPUT_TRIGGER, &mpu->mode);
112 spin_unlock_irqrestore(&mpu->input_lock, flags);
114 snd_msndmidi_input_read(mpu);
117 void snd_msndmidi_input_read(void *mpuv)
120 struct snd_msndmidi *mpu = mpuv;
121 void *pwMIDQData = mpu->dev->mappedbase + MIDQ_DATA_BUFF;
123 spin_lock_irqsave(&mpu->input_lock, flags);
124 while (readw(mpu->dev->MIDQ + JQS_wTail) !=
125 readw(mpu->dev->MIDQ + JQS_wHead)) {
127 val = readw(pwMIDQData + 2 * readw(mpu->dev->MIDQ + JQS_wHead));
129 if (test_bit(MSNDMIDI_MODE_BIT_INPUT_TRIGGER,
131 snd_rawmidi_receive(mpu->substream_input,
132 (unsigned char *)&val, 1);
134 wTmp = readw(mpu->dev->MIDQ + JQS_wHead) + 1;
135 if (wTmp > readw(mpu->dev->MIDQ + JQS_wSize))
136 writew(0, mpu->dev->MIDQ + JQS_wHead);
138 writew(wTmp, mpu->dev->MIDQ + JQS_wHead);
140 spin_unlock_irqrestore(&mpu->input_lock, flags);
142 EXPORT_SYMBOL(snd_msndmidi_input_read);
144 static struct snd_rawmidi_ops snd_msndmidi_input = {
145 .open = snd_msndmidi_input_open,
146 .close = snd_msndmidi_input_close,
147 .trigger = snd_msndmidi_input_trigger,
150 static void snd_msndmidi_free(struct snd_rawmidi *rmidi)
152 struct snd_msndmidi *mpu = rmidi->private_data;
156 int snd_msndmidi_new(struct snd_card *card, int device)
158 struct snd_msnd *chip = card->private_data;
159 struct snd_msndmidi *mpu;
160 struct snd_rawmidi *rmidi;
163 err = snd_rawmidi_new(card, "MSND-MIDI", device, 1, 1, &rmidi);
166 mpu = kzalloc(sizeof(*mpu), GFP_KERNEL);
168 snd_device_free(card, rmidi);
172 chip->msndmidi_mpu = mpu;
173 rmidi->private_data = mpu;
174 rmidi->private_free = snd_msndmidi_free;
175 spin_lock_init(&mpu->input_lock);
176 strcpy(rmidi->name, "MSND MIDI");
177 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
178 &snd_msndmidi_input);
179 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;