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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/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>
34
35#include "msnd.h"
36
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
41
42struct snd_msndmidi {
43 struct snd_msnd *dev;
44
45 unsigned long mode; /* MSNDMIDI_MODE_XXXX */
46
47 struct snd_rawmidi_substream *substream_input;
48
49 spinlock_t input_lock;
50};
51
52/*
53 * input/output open/close - protected by open_mutex in rawmidi.c
54 */
55static int snd_msndmidi_input_open(struct snd_rawmidi_substream *substream)
56{
57 struct snd_msndmidi *mpu;
58
59 snd_printdd("snd_msndmidi_input_open()\n");
60
61 mpu = substream->rmidi->private_data;
62
63 mpu->substream_input = substream;
64
65 snd_msnd_enable_irq(mpu->dev);
66
67 snd_msnd_send_dsp_cmd(mpu->dev, HDEX_MIDI_IN_START);
68 set_bit(MSNDMIDI_MODE_BIT_INPUT, &mpu->mode);
69 return 0;
70}
71
72static int snd_msndmidi_input_close(struct snd_rawmidi_substream *substream)
73{
74 struct snd_msndmidi *mpu;
75
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);
81 return 0;
82}
83
84static void snd_msndmidi_input_drop(struct snd_msndmidi *mpu)
85{
86 u16 tail;
87
88 tail = readw(mpu->dev->MIDQ + JQS_wTail);
89 writew(tail, mpu->dev->MIDQ + JQS_wHead);
90}
91
92/*
93 * trigger input
94 */
95static void snd_msndmidi_input_trigger(struct snd_rawmidi_substream *substream,
96 int up)
97{
98 unsigned long flags;
99 struct snd_msndmidi *mpu;
100
101 snd_printdd("snd_msndmidi_input_trigger(, %i)\n", up);
102
103 mpu = substream->rmidi->private_data;
104 spin_lock_irqsave(&mpu->input_lock, flags);
105 if (up) {
106 if (!test_and_set_bit(MSNDMIDI_MODE_BIT_INPUT_TRIGGER,
107 &mpu->mode))
108 snd_msndmidi_input_drop(mpu);
109 } else {
110 clear_bit(MSNDMIDI_MODE_BIT_INPUT_TRIGGER, &mpu->mode);
111 }
112 spin_unlock_irqrestore(&mpu->input_lock, flags);
113 if (up)
114 snd_msndmidi_input_read(mpu);
115}
116
117void snd_msndmidi_input_read(void *mpuv)
118{
119 unsigned long flags;
120 struct snd_msndmidi *mpu = mpuv;
121 void *pwMIDQData = mpu->dev->mappedbase + MIDQ_DATA_BUFF;
122
123 spin_lock_irqsave(&mpu->input_lock, flags);
124 while (readw(mpu->dev->MIDQ + JQS_wTail) !=
125 readw(mpu->dev->MIDQ + JQS_wHead)) {
126 u16 wTmp, val;
127 val = readw(pwMIDQData + 2 * readw(mpu->dev->MIDQ + JQS_wHead));
128
129 if (test_bit(MSNDMIDI_MODE_BIT_INPUT_TRIGGER,
130 &mpu->mode))
131 snd_rawmidi_receive(mpu->substream_input,
132 (unsigned char *)&val, 1);
133
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);
137 else
138 writew(wTmp, mpu->dev->MIDQ + JQS_wHead);
139 }
140 spin_unlock_irqrestore(&mpu->input_lock, flags);
141}
142EXPORT_SYMBOL(snd_msndmidi_input_read);
143
144static 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,
148};
149
150static void snd_msndmidi_free(struct snd_rawmidi *rmidi)
151{
152 struct snd_msndmidi *mpu = rmidi->private_data;
153 kfree(mpu);
154}
155
156int snd_msndmidi_new(struct snd_card *card, int device)
157{
158 struct snd_msnd *chip = card->private_data;
159 struct snd_msndmidi *mpu;
160 struct snd_rawmidi *rmidi;
161 int err;
162
163 err = snd_rawmidi_new(card, "MSND-MIDI", device, 1, 1, &rmidi);
164 if (err < 0)
165 return err;
166 mpu = kzalloc(sizeof(*mpu), GFP_KERNEL);
167 if (mpu == NULL) {
168 snd_device_free(card, rmidi);
169 return -ENOMEM;
170 }
171 mpu->dev = chip;
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;
180 return 0;
181}
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 * Copyright (c) 2009 by Krzysztof Helt
5 * Routines for control of MPU-401 in UART mode
6 *
7 * MPU-401 supports UART mode which is not capable generate transmit
8 * interrupts thus output is done via polling. Also, if irq < 0, then
9 * input is done also via polling. Do not expect good performance.
10 */
11
12#include <linux/io.h>
13#include <linux/slab.h>
14#include <linux/delay.h>
15#include <linux/ioport.h>
16#include <linux/errno.h>
17#include <linux/export.h>
18#include <sound/core.h>
19#include <sound/rawmidi.h>
20
21#include "msnd.h"
22
23#define MSNDMIDI_MODE_BIT_INPUT 0
24#define MSNDMIDI_MODE_BIT_OUTPUT 1
25#define MSNDMIDI_MODE_BIT_INPUT_TRIGGER 2
26#define MSNDMIDI_MODE_BIT_OUTPUT_TRIGGER 3
27
28struct snd_msndmidi {
29 struct snd_msnd *dev;
30
31 unsigned long mode; /* MSNDMIDI_MODE_XXXX */
32
33 struct snd_rawmidi_substream *substream_input;
34
35 spinlock_t input_lock;
36};
37
38/*
39 * input/output open/close - protected by open_mutex in rawmidi.c
40 */
41static int snd_msndmidi_input_open(struct snd_rawmidi_substream *substream)
42{
43 struct snd_msndmidi *mpu;
44
45 snd_printdd("snd_msndmidi_input_open()\n");
46
47 mpu = substream->rmidi->private_data;
48
49 mpu->substream_input = substream;
50
51 snd_msnd_enable_irq(mpu->dev);
52
53 snd_msnd_send_dsp_cmd(mpu->dev, HDEX_MIDI_IN_START);
54 set_bit(MSNDMIDI_MODE_BIT_INPUT, &mpu->mode);
55 return 0;
56}
57
58static int snd_msndmidi_input_close(struct snd_rawmidi_substream *substream)
59{
60 struct snd_msndmidi *mpu;
61
62 mpu = substream->rmidi->private_data;
63 snd_msnd_send_dsp_cmd(mpu->dev, HDEX_MIDI_IN_STOP);
64 clear_bit(MSNDMIDI_MODE_BIT_INPUT, &mpu->mode);
65 mpu->substream_input = NULL;
66 snd_msnd_disable_irq(mpu->dev);
67 return 0;
68}
69
70static void snd_msndmidi_input_drop(struct snd_msndmidi *mpu)
71{
72 u16 tail;
73
74 tail = readw(mpu->dev->MIDQ + JQS_wTail);
75 writew(tail, mpu->dev->MIDQ + JQS_wHead);
76}
77
78/*
79 * trigger input
80 */
81static void snd_msndmidi_input_trigger(struct snd_rawmidi_substream *substream,
82 int up)
83{
84 unsigned long flags;
85 struct snd_msndmidi *mpu;
86
87 snd_printdd("snd_msndmidi_input_trigger(, %i)\n", up);
88
89 mpu = substream->rmidi->private_data;
90 spin_lock_irqsave(&mpu->input_lock, flags);
91 if (up) {
92 if (!test_and_set_bit(MSNDMIDI_MODE_BIT_INPUT_TRIGGER,
93 &mpu->mode))
94 snd_msndmidi_input_drop(mpu);
95 } else {
96 clear_bit(MSNDMIDI_MODE_BIT_INPUT_TRIGGER, &mpu->mode);
97 }
98 spin_unlock_irqrestore(&mpu->input_lock, flags);
99 if (up)
100 snd_msndmidi_input_read(mpu);
101}
102
103void snd_msndmidi_input_read(void *mpuv)
104{
105 unsigned long flags;
106 struct snd_msndmidi *mpu = mpuv;
107 void __iomem *pwMIDQData = mpu->dev->mappedbase + MIDQ_DATA_BUFF;
108 u16 head, tail, size;
109
110 spin_lock_irqsave(&mpu->input_lock, flags);
111 head = readw(mpu->dev->MIDQ + JQS_wHead);
112 tail = readw(mpu->dev->MIDQ + JQS_wTail);
113 size = readw(mpu->dev->MIDQ + JQS_wSize);
114 if (head > size || tail > size)
115 goto out;
116 while (head != tail) {
117 unsigned char val = readw(pwMIDQData + 2 * head);
118
119 if (test_bit(MSNDMIDI_MODE_BIT_INPUT_TRIGGER, &mpu->mode))
120 snd_rawmidi_receive(mpu->substream_input, &val, 1);
121 if (++head > size)
122 head = 0;
123 writew(head, mpu->dev->MIDQ + JQS_wHead);
124 }
125 out:
126 spin_unlock_irqrestore(&mpu->input_lock, flags);
127}
128EXPORT_SYMBOL(snd_msndmidi_input_read);
129
130static const struct snd_rawmidi_ops snd_msndmidi_input = {
131 .open = snd_msndmidi_input_open,
132 .close = snd_msndmidi_input_close,
133 .trigger = snd_msndmidi_input_trigger,
134};
135
136static void snd_msndmidi_free(struct snd_rawmidi *rmidi)
137{
138 struct snd_msndmidi *mpu = rmidi->private_data;
139 kfree(mpu);
140}
141
142int snd_msndmidi_new(struct snd_card *card, int device)
143{
144 struct snd_msnd *chip = card->private_data;
145 struct snd_msndmidi *mpu;
146 struct snd_rawmidi *rmidi;
147 int err;
148
149 err = snd_rawmidi_new(card, "MSND-MIDI", device, 1, 1, &rmidi);
150 if (err < 0)
151 return err;
152 mpu = kzalloc(sizeof(*mpu), GFP_KERNEL);
153 if (mpu == NULL) {
154 snd_device_free(card, rmidi);
155 return -ENOMEM;
156 }
157 mpu->dev = chip;
158 chip->msndmidi_mpu = mpu;
159 rmidi->private_data = mpu;
160 rmidi->private_free = snd_msndmidi_free;
161 spin_lock_init(&mpu->input_lock);
162 strcpy(rmidi->name, "MSND MIDI");
163 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
164 &snd_msndmidi_input);
165 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;
166 return 0;
167}