1 /*
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
5 *
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.
9 *
10 *
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.
15 *
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.
20 *
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
24 *
25 */
26
27 #include <linux/io.h>
28 #include <linux/delay.h>
29 #include <linux/ioport.h>
30 #include <linux/errno.h>
31 #include <sound/core.h>
32 #include <sound/rawmidi.h>
33
34 #include "msnd.h"
35
36 #define MSNDMIDI_MODE_BIT_INPUT 0
37 #define MSNDMIDI_MODE_BIT_OUTPUT 1
38 #define MSNDMIDI_MODE_BIT_INPUT_TRIGGER 2
39 #define MSNDMIDI_MODE_BIT_OUTPUT_TRIGGER 3
40
41 struct snd_msndmidi {
42 struct snd_msnd *dev;
43
44 unsigned long mode; /* MSNDMIDI_MODE_XXXX */
45
46 struct snd_rawmidi_substream *substream_input;
47
48 spinlock_t input_lock;
49 };
50
51 /*
52 * input/output open/close - protected by open_mutex in rawmidi.c
53 */
54 static int snd_msndmidi_input_open(struct snd_rawmidi_substream *substream)
55 {
56 struct snd_msndmidi *mpu;
57
58 snd_printdd("snd_msndmidi_input_open()\n");
59
60 mpu = substream->rmidi->private_data;
61
62 mpu->substream_input = substream;
63
64 snd_msnd_enable_irq(mpu->dev);
65
66 snd_msnd_send_dsp_cmd(mpu->dev, HDEX_MIDI_IN_START);
67 set_bit(MSNDMIDI_MODE_BIT_INPUT, &mpu->mode);
68 return 0;
69 }
70
71 static int snd_msndmidi_input_close(struct snd_rawmidi_substream *substream)
72 {
73 struct snd_msndmidi *mpu;
74
75 mpu = substream->rmidi->private_data;
76 snd_msnd_send_dsp_cmd(mpu->dev, HDEX_MIDI_IN_STOP);
77 clear_bit(MSNDMIDI_MODE_BIT_INPUT, &mpu->mode);
78 mpu->substream_input = NULL;
79 snd_msnd_disable_irq(mpu->dev);
80 return 0;
81 }
82
83 static void snd_msndmidi_input_drop(struct snd_msndmidi *mpu)
84 {
85 u16 tail;
86
87 tail = readw(mpu->dev->MIDQ + JQS_wTail);
88 writew(tail, mpu->dev->MIDQ + JQS_wHead);
89 }
90
91 /*
92 * trigger input
93 */
94 static void snd_msndmidi_input_trigger(struct snd_rawmidi_substream *substream,
95 int up)
96 {
97 unsigned long flags;
98 struct snd_msndmidi *mpu;
99
100 snd_printdd("snd_msndmidi_input_trigger(, %i)\n", up);
101
102 mpu = substream->rmidi->private_data;
103 spin_lock_irqsave(&mpu->input_lock, flags);
104 if (up) {
105 if (!test_and_set_bit(MSNDMIDI_MODE_BIT_INPUT_TRIGGER,
106 &mpu->mode))
107 snd_msndmidi_input_drop(mpu);
108 } else {
109 clear_bit(MSNDMIDI_MODE_BIT_INPUT_TRIGGER, &mpu->mode);
110 }
111 spin_unlock_irqrestore(&mpu->input_lock, flags);
112 if (up)
113 snd_msndmidi_input_read(mpu);
114 }
115
116 void snd_msndmidi_input_read(void *mpuv)
117 {
118 unsigned long flags;
119 struct snd_msndmidi *mpu = mpuv;
120 void *pwMIDQData = mpu->dev->mappedbase + MIDQ_DATA_BUFF;
121
122 spin_lock_irqsave(&mpu->input_lock, flags);
123 while (readw(mpu->dev->MIDQ + JQS_wTail) !=
124 readw(mpu->dev->MIDQ + JQS_wHead)) {
125 u16 wTmp, val;
126 val = readw(pwMIDQData + 2 * readw(mpu->dev->MIDQ + JQS_wHead));
127
128 if (test_bit(MSNDMIDI_MODE_BIT_INPUT_TRIGGER,
129 &mpu->mode))
130 snd_rawmidi_receive(mpu->substream_input,
131 (unsigned char *)&val, 1);
132
133 wTmp = readw(mpu->dev->MIDQ + JQS_wHead) + 1;
134 if (wTmp > readw(mpu->dev->MIDQ + JQS_wSize))
135 writew(0, mpu->dev->MIDQ + JQS_wHead);
136 else
137 writew(wTmp, mpu->dev->MIDQ + JQS_wHead);
138 }
139 spin_unlock_irqrestore(&mpu->input_lock, flags);
140 }
141 EXPORT_SYMBOL(snd_msndmidi_input_read);
142
143 static struct snd_rawmidi_ops snd_msndmidi_input = {
144 .open = snd_msndmidi_input_open,
145 .close = snd_msndmidi_input_close,
146 .trigger = snd_msndmidi_input_trigger,
147 };
148
149 static void snd_msndmidi_free(struct snd_rawmidi *rmidi)
150 {
151 struct snd_msndmidi *mpu = rmidi->private_data;
152 kfree(mpu);
153 }
154
155 int snd_msndmidi_new(struct snd_card *card, int device)
156 {
157 struct snd_msnd *chip = card->private_data;
158 struct snd_msndmidi *mpu;
159 struct snd_rawmidi *rmidi;
160 int err;
161
162 err = snd_rawmidi_new(card, "MSND-MIDI", device, 1, 1, &rmidi);
163 if (err < 0)
164 return err;
165 mpu = kcalloc(1, sizeof(*mpu), GFP_KERNEL);
166 if (mpu == NULL) {
167 snd_device_free(card, rmidi);
168 return -ENOMEM;
169 }
170 mpu->dev = chip;
171 chip->msndmidi_mpu = mpu;
172 rmidi->private_data = mpu;
173 rmidi->private_free = snd_msndmidi_free;
174 spin_lock_init(&mpu->input_lock);
175 strcpy(rmidi->name, "MSND MIDI");
176 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
177 &snd_msndmidi_input);
178 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;
179 return 0;
180 }
181
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