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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
f6c63835 KH |
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. | |
f6c63835 KH |
10 | */ |
11 | ||
12 | #include <linux/io.h> | |
5a0e3ad6 | 13 | #include <linux/slab.h> |
f6c63835 KH |
14 | #include <linux/delay.h> |
15 | #include <linux/ioport.h> | |
16 | #include <linux/errno.h> | |
d81a6d71 | 17 | #include <linux/export.h> |
f6c63835 KH |
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 | ||
28 | struct 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 | */ | |
41 | static 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 | ||
58 | static 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 | ||
70 | static 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 | */ | |
81 | static 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 | ||
103 | void snd_msndmidi_input_read(void *mpuv) | |
104 | { | |
105 | unsigned long flags; | |
106 | struct snd_msndmidi *mpu = mpuv; | |
ab647a2d | 107 | void __iomem *pwMIDQData = mpu->dev->mappedbase + MIDQ_DATA_BUFF; |
20e2b791 | 108 | u16 head, tail, size; |
f6c63835 KH |
109 | |
110 | spin_lock_irqsave(&mpu->input_lock, flags); | |
20e2b791 TI |
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); | |
f6c63835 | 124 | } |
20e2b791 | 125 | out: |
f6c63835 KH |
126 | spin_unlock_irqrestore(&mpu->input_lock, flags); |
127 | } | |
128 | EXPORT_SYMBOL(snd_msndmidi_input_read); | |
129 | ||
9021b2b8 | 130 | static const struct snd_rawmidi_ops snd_msndmidi_input = { |
f6c63835 KH |
131 | .open = snd_msndmidi_input_open, |
132 | .close = snd_msndmidi_input_close, | |
133 | .trigger = snd_msndmidi_input_trigger, | |
134 | }; | |
135 | ||
136 | static void snd_msndmidi_free(struct snd_rawmidi *rmidi) | |
137 | { | |
138 | struct snd_msndmidi *mpu = rmidi->private_data; | |
139 | kfree(mpu); | |
140 | } | |
141 | ||
142 | int 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; | |
ef86f581 | 152 | mpu = kzalloc(sizeof(*mpu), GFP_KERNEL); |
f6c63835 KH |
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 | } |