This source file includes following definitions.
- snd_seq_oss_readq_new
- snd_seq_oss_readq_delete
- snd_seq_oss_readq_clear
- snd_seq_oss_readq_puts
- readq_dump_sysex
- snd_seq_oss_readq_sysex
- snd_seq_oss_readq_put_event
- snd_seq_oss_readq_pick
- snd_seq_oss_readq_wait
- snd_seq_oss_readq_free
- snd_seq_oss_readq_poll
- snd_seq_oss_readq_put_timestamp
- snd_seq_oss_readq_info_read
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10 #include "seq_oss_readq.h"
11 #include "seq_oss_event.h"
12 #include <sound/seq_oss_legacy.h>
13 #include "../seq_lock.h"
14 #include <linux/wait.h>
15 #include <linux/slab.h>
16
17
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19
20
21 #define SNDRV_SEQ_OSS_MAX_TIMEOUT (HZ * 3600)
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31
32 struct seq_oss_readq *
33 snd_seq_oss_readq_new(struct seq_oss_devinfo *dp, int maxlen)
34 {
35 struct seq_oss_readq *q;
36
37 q = kzalloc(sizeof(*q), GFP_KERNEL);
38 if (!q)
39 return NULL;
40
41 q->q = kcalloc(maxlen, sizeof(union evrec), GFP_KERNEL);
42 if (!q->q) {
43 kfree(q);
44 return NULL;
45 }
46
47 q->maxlen = maxlen;
48 q->qlen = 0;
49 q->head = q->tail = 0;
50 init_waitqueue_head(&q->midi_sleep);
51 spin_lock_init(&q->lock);
52 q->pre_event_timeout = SNDRV_SEQ_OSS_MAX_TIMEOUT;
53 q->input_time = (unsigned long)-1;
54
55 return q;
56 }
57
58
59
60
61 void
62 snd_seq_oss_readq_delete(struct seq_oss_readq *q)
63 {
64 if (q) {
65 kfree(q->q);
66 kfree(q);
67 }
68 }
69
70
71
72
73 void
74 snd_seq_oss_readq_clear(struct seq_oss_readq *q)
75 {
76 if (q->qlen) {
77 q->qlen = 0;
78 q->head = q->tail = 0;
79 }
80
81 wake_up(&q->midi_sleep);
82 q->input_time = (unsigned long)-1;
83 }
84
85
86
87
88 int
89 snd_seq_oss_readq_puts(struct seq_oss_readq *q, int dev, unsigned char *data, int len)
90 {
91 union evrec rec;
92 int result;
93
94 memset(&rec, 0, sizeof(rec));
95 rec.c[0] = SEQ_MIDIPUTC;
96 rec.c[2] = dev;
97
98 while (len-- > 0) {
99 rec.c[1] = *data++;
100 result = snd_seq_oss_readq_put_event(q, &rec);
101 if (result < 0)
102 return result;
103 }
104 return 0;
105 }
106
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110
111 struct readq_sysex_ctx {
112 struct seq_oss_readq *readq;
113 int dev;
114 };
115
116 static int readq_dump_sysex(void *ptr, void *buf, int count)
117 {
118 struct readq_sysex_ctx *ctx = ptr;
119
120 return snd_seq_oss_readq_puts(ctx->readq, ctx->dev, buf, count);
121 }
122
123 int snd_seq_oss_readq_sysex(struct seq_oss_readq *q, int dev,
124 struct snd_seq_event *ev)
125 {
126 struct readq_sysex_ctx ctx = {
127 .readq = q,
128 .dev = dev
129 };
130
131 if ((ev->flags & SNDRV_SEQ_EVENT_LENGTH_MASK) != SNDRV_SEQ_EVENT_LENGTH_VARIABLE)
132 return 0;
133 return snd_seq_dump_var_event(ev, readq_dump_sysex, &ctx);
134 }
135
136
137
138
139
140 int
141 snd_seq_oss_readq_put_event(struct seq_oss_readq *q, union evrec *ev)
142 {
143 unsigned long flags;
144
145 spin_lock_irqsave(&q->lock, flags);
146 if (q->qlen >= q->maxlen - 1) {
147 spin_unlock_irqrestore(&q->lock, flags);
148 return -ENOMEM;
149 }
150
151 memcpy(&q->q[q->tail], ev, sizeof(*ev));
152 q->tail = (q->tail + 1) % q->maxlen;
153 q->qlen++;
154
155
156 wake_up(&q->midi_sleep);
157
158 spin_unlock_irqrestore(&q->lock, flags);
159
160 return 0;
161 }
162
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166
167
168 int
169 snd_seq_oss_readq_pick(struct seq_oss_readq *q, union evrec *rec)
170 {
171 if (q->qlen == 0)
172 return -EAGAIN;
173 memcpy(rec, &q->q[q->head], sizeof(*rec));
174 return 0;
175 }
176
177
178
179
180 void
181 snd_seq_oss_readq_wait(struct seq_oss_readq *q)
182 {
183 wait_event_interruptible_timeout(q->midi_sleep,
184 (q->qlen > 0 || q->head == q->tail),
185 q->pre_event_timeout);
186 }
187
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190
191
192 void
193 snd_seq_oss_readq_free(struct seq_oss_readq *q)
194 {
195 if (q->qlen > 0) {
196 q->head = (q->head + 1) % q->maxlen;
197 q->qlen--;
198 }
199 }
200
201
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203
204
205 unsigned int
206 snd_seq_oss_readq_poll(struct seq_oss_readq *q, struct file *file, poll_table *wait)
207 {
208 poll_wait(file, &q->midi_sleep, wait);
209 return q->qlen;
210 }
211
212
213
214
215 int
216 snd_seq_oss_readq_put_timestamp(struct seq_oss_readq *q, unsigned long curt, int seq_mode)
217 {
218 if (curt != q->input_time) {
219 union evrec rec;
220 memset(&rec, 0, sizeof(rec));
221 switch (seq_mode) {
222 case SNDRV_SEQ_OSS_MODE_SYNTH:
223 rec.echo = (curt << 8) | SEQ_WAIT;
224 snd_seq_oss_readq_put_event(q, &rec);
225 break;
226 case SNDRV_SEQ_OSS_MODE_MUSIC:
227 rec.t.code = EV_TIMING;
228 rec.t.cmd = TMR_WAIT_ABS;
229 rec.t.time = curt;
230 snd_seq_oss_readq_put_event(q, &rec);
231 break;
232 }
233 q->input_time = curt;
234 }
235 return 0;
236 }
237
238
239 #ifdef CONFIG_SND_PROC_FS
240
241
242
243 void
244 snd_seq_oss_readq_info_read(struct seq_oss_readq *q, struct snd_info_buffer *buf)
245 {
246 snd_iprintf(buf, " read queue [%s] length = %d : tick = %ld\n",
247 (waitqueue_active(&q->midi_sleep) ? "sleeping":"running"),
248 q->qlen, q->input_time);
249 }
250 #endif