Loading...
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}
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 <linux/export.h>
33#include <sound/core.h>
34#include <sound/rawmidi.h>
35
36#include "msnd.h"
37
38#define MSNDMIDI_MODE_BIT_INPUT 0
39#define MSNDMIDI_MODE_BIT_OUTPUT 1
40#define MSNDMIDI_MODE_BIT_INPUT_TRIGGER 2
41#define MSNDMIDI_MODE_BIT_OUTPUT_TRIGGER 3
42
43struct snd_msndmidi {
44 struct snd_msnd *dev;
45
46 unsigned long mode; /* MSNDMIDI_MODE_XXXX */
47
48 struct snd_rawmidi_substream *substream_input;
49
50 spinlock_t input_lock;
51};
52
53/*
54 * input/output open/close - protected by open_mutex in rawmidi.c
55 */
56static int snd_msndmidi_input_open(struct snd_rawmidi_substream *substream)
57{
58 struct snd_msndmidi *mpu;
59
60 snd_printdd("snd_msndmidi_input_open()\n");
61
62 mpu = substream->rmidi->private_data;
63
64 mpu->substream_input = substream;
65
66 snd_msnd_enable_irq(mpu->dev);
67
68 snd_msnd_send_dsp_cmd(mpu->dev, HDEX_MIDI_IN_START);
69 set_bit(MSNDMIDI_MODE_BIT_INPUT, &mpu->mode);
70 return 0;
71}
72
73static int snd_msndmidi_input_close(struct snd_rawmidi_substream *substream)
74{
75 struct snd_msndmidi *mpu;
76
77 mpu = substream->rmidi->private_data;
78 snd_msnd_send_dsp_cmd(mpu->dev, HDEX_MIDI_IN_STOP);
79 clear_bit(MSNDMIDI_MODE_BIT_INPUT, &mpu->mode);
80 mpu->substream_input = NULL;
81 snd_msnd_disable_irq(mpu->dev);
82 return 0;
83}
84
85static void snd_msndmidi_input_drop(struct snd_msndmidi *mpu)
86{
87 u16 tail;
88
89 tail = readw(mpu->dev->MIDQ + JQS_wTail);
90 writew(tail, mpu->dev->MIDQ + JQS_wHead);
91}
92
93/*
94 * trigger input
95 */
96static void snd_msndmidi_input_trigger(struct snd_rawmidi_substream *substream,
97 int up)
98{
99 unsigned long flags;
100 struct snd_msndmidi *mpu;
101
102 snd_printdd("snd_msndmidi_input_trigger(, %i)\n", up);
103
104 mpu = substream->rmidi->private_data;
105 spin_lock_irqsave(&mpu->input_lock, flags);
106 if (up) {
107 if (!test_and_set_bit(MSNDMIDI_MODE_BIT_INPUT_TRIGGER,
108 &mpu->mode))
109 snd_msndmidi_input_drop(mpu);
110 } else {
111 clear_bit(MSNDMIDI_MODE_BIT_INPUT_TRIGGER, &mpu->mode);
112 }
113 spin_unlock_irqrestore(&mpu->input_lock, flags);
114 if (up)
115 snd_msndmidi_input_read(mpu);
116}
117
118void snd_msndmidi_input_read(void *mpuv)
119{
120 unsigned long flags;
121 struct snd_msndmidi *mpu = mpuv;
122 void *pwMIDQData = mpu->dev->mappedbase + MIDQ_DATA_BUFF;
123 u16 head, tail, size;
124
125 spin_lock_irqsave(&mpu->input_lock, flags);
126 head = readw(mpu->dev->MIDQ + JQS_wHead);
127 tail = readw(mpu->dev->MIDQ + JQS_wTail);
128 size = readw(mpu->dev->MIDQ + JQS_wSize);
129 if (head > size || tail > size)
130 goto out;
131 while (head != tail) {
132 unsigned char val = readw(pwMIDQData + 2 * head);
133
134 if (test_bit(MSNDMIDI_MODE_BIT_INPUT_TRIGGER, &mpu->mode))
135 snd_rawmidi_receive(mpu->substream_input, &val, 1);
136 if (++head > size)
137 head = 0;
138 writew(head, mpu->dev->MIDQ + JQS_wHead);
139 }
140 out:
141 spin_unlock_irqrestore(&mpu->input_lock, flags);
142}
143EXPORT_SYMBOL(snd_msndmidi_input_read);
144
145static const struct snd_rawmidi_ops snd_msndmidi_input = {
146 .open = snd_msndmidi_input_open,
147 .close = snd_msndmidi_input_close,
148 .trigger = snd_msndmidi_input_trigger,
149};
150
151static void snd_msndmidi_free(struct snd_rawmidi *rmidi)
152{
153 struct snd_msndmidi *mpu = rmidi->private_data;
154 kfree(mpu);
155}
156
157int snd_msndmidi_new(struct snd_card *card, int device)
158{
159 struct snd_msnd *chip = card->private_data;
160 struct snd_msndmidi *mpu;
161 struct snd_rawmidi *rmidi;
162 int err;
163
164 err = snd_rawmidi_new(card, "MSND-MIDI", device, 1, 1, &rmidi);
165 if (err < 0)
166 return err;
167 mpu = kzalloc(sizeof(*mpu), GFP_KERNEL);
168 if (mpu == NULL) {
169 snd_device_free(card, rmidi);
170 return -ENOMEM;
171 }
172 mpu->dev = chip;
173 chip->msndmidi_mpu = mpu;
174 rmidi->private_data = mpu;
175 rmidi->private_free = snd_msndmidi_free;
176 spin_lock_init(&mpu->input_lock);
177 strcpy(rmidi->name, "MSND MIDI");
178 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
179 &snd_msndmidi_input);
180 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;
181 return 0;
182}