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f6c63835 KH |
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> | |
5a0e3ad6 | 28 | #include <linux/slab.h> |
f6c63835 KH |
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 | ||
42 | struct 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 | */ | |
55 | static 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 | ||
72 | static 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 | ||
84 | static 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 | */ | |
95 | static 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 | ||
117 | void 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 | } | |
142 | EXPORT_SYMBOL(snd_msndmidi_input_read); | |
143 | ||
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, | |
148 | }; | |
149 | ||
150 | static void snd_msndmidi_free(struct snd_rawmidi *rmidi) | |
151 | { | |
152 | struct snd_msndmidi *mpu = rmidi->private_data; | |
153 | kfree(mpu); | |
154 | } | |
155 | ||
156 | int 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; | |
ef86f581 | 166 | mpu = kzalloc(sizeof(*mpu), GFP_KERNEL); |
f6c63835 KH |
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 | } |