1 /*
2 * OSS compatible sequencer driver
3 *
4 * Timer control routines
5 *
6 * Copyright (C) 1998,99 Takashi Iwai <tiwai@suse.de>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 */
22
23 #include "seq_oss_timer.h"
24 #include "seq_oss_event.h"
25 #include <sound/seq_oss_legacy.h>
26 #include <linux/slab.h>
27
28 /*
29 */
30 #define MIN_OSS_TEMPO 8
31 #define MAX_OSS_TEMPO 360
32 #define MIN_OSS_TIMEBASE 1
33 #define MAX_OSS_TIMEBASE 1000
34
35 /*
36 */
37 static void calc_alsa_tempo(struct seq_oss_timer *timer);
38 static int send_timer_event(struct seq_oss_devinfo *dp, int type, int value);
39
40
41 /*
42 * create and register a new timer.
43 * if queue is not started yet, start it.
44 */
45 struct seq_oss_timer *
snd_seq_oss_timer_new(struct seq_oss_devinfo * dp)46 snd_seq_oss_timer_new(struct seq_oss_devinfo *dp)
47 {
48 struct seq_oss_timer *rec;
49
50 rec = kzalloc(sizeof(*rec), GFP_KERNEL);
51 if (rec == NULL)
52 return NULL;
53
54 rec->dp = dp;
55 rec->cur_tick = 0;
56 rec->realtime = 0;
57 rec->running = 0;
58 rec->oss_tempo = 60;
59 rec->oss_timebase = 100;
60 calc_alsa_tempo(rec);
61
62 return rec;
63 }
64
65
66 /*
67 * delete timer.
68 * if no more timer exists, stop the queue.
69 */
70 void
snd_seq_oss_timer_delete(struct seq_oss_timer * rec)71 snd_seq_oss_timer_delete(struct seq_oss_timer *rec)
72 {
73 if (rec) {
74 snd_seq_oss_timer_stop(rec);
75 kfree(rec);
76 }
77 }
78
79
80 /*
81 * process one timing event
82 * return 1 : event proceseed -- skip this event
83 * 0 : not a timer event -- enqueue this event
84 */
85 int
snd_seq_oss_process_timer_event(struct seq_oss_timer * rec,union evrec * ev)86 snd_seq_oss_process_timer_event(struct seq_oss_timer *rec, union evrec *ev)
87 {
88 abstime_t parm = ev->t.time;
89
90 if (ev->t.code == EV_TIMING) {
91 switch (ev->t.cmd) {
92 case TMR_WAIT_REL:
93 parm += rec->cur_tick;
94 rec->realtime = 0;
95 /* continue to next */
96 case TMR_WAIT_ABS:
97 if (parm == 0) {
98 rec->realtime = 1;
99 } else if (parm >= rec->cur_tick) {
100 rec->realtime = 0;
101 rec->cur_tick = parm;
102 }
103 return 1; /* skip this event */
104
105 case TMR_START:
106 snd_seq_oss_timer_start(rec);
107 return 1;
108
109 }
110 } else if (ev->s.code == SEQ_WAIT) {
111 /* time = from 1 to 3 bytes */
112 parm = (ev->echo >> 8) & 0xffffff;
113 if (parm > rec->cur_tick) {
114 /* set next event time */
115 rec->cur_tick = parm;
116 rec->realtime = 0;
117 }
118 return 1;
119 }
120
121 return 0;
122 }
123
124
125 /*
126 * convert tempo units
127 */
128 static void
calc_alsa_tempo(struct seq_oss_timer * timer)129 calc_alsa_tempo(struct seq_oss_timer *timer)
130 {
131 timer->tempo = (60 * 1000000) / timer->oss_tempo;
132 timer->ppq = timer->oss_timebase;
133 }
134
135
136 /*
137 * dispatch a timer event
138 */
139 static int
send_timer_event(struct seq_oss_devinfo * dp,int type,int value)140 send_timer_event(struct seq_oss_devinfo *dp, int type, int value)
141 {
142 struct snd_seq_event ev;
143
144 memset(&ev, 0, sizeof(ev));
145 ev.type = type;
146 ev.source.client = dp->cseq;
147 ev.source.port = 0;
148 ev.dest.client = SNDRV_SEQ_CLIENT_SYSTEM;
149 ev.dest.port = SNDRV_SEQ_PORT_SYSTEM_TIMER;
150 ev.queue = dp->queue;
151 ev.data.queue.queue = dp->queue;
152 ev.data.queue.param.value = value;
153 return snd_seq_kernel_client_dispatch(dp->cseq, &ev, 1, 0);
154 }
155
156 /*
157 * set queue tempo and start queue
158 */
159 int
snd_seq_oss_timer_start(struct seq_oss_timer * timer)160 snd_seq_oss_timer_start(struct seq_oss_timer *timer)
161 {
162 struct seq_oss_devinfo *dp = timer->dp;
163 struct snd_seq_queue_tempo tmprec;
164
165 if (timer->running)
166 snd_seq_oss_timer_stop(timer);
167
168 memset(&tmprec, 0, sizeof(tmprec));
169 tmprec.queue = dp->queue;
170 tmprec.ppq = timer->ppq;
171 tmprec.tempo = timer->tempo;
172 snd_seq_set_queue_tempo(dp->cseq, &tmprec);
173
174 send_timer_event(dp, SNDRV_SEQ_EVENT_START, 0);
175 timer->running = 1;
176 timer->cur_tick = 0;
177 return 0;
178 }
179
180
181 /*
182 * stop queue
183 */
184 int
snd_seq_oss_timer_stop(struct seq_oss_timer * timer)185 snd_seq_oss_timer_stop(struct seq_oss_timer *timer)
186 {
187 if (! timer->running)
188 return 0;
189 send_timer_event(timer->dp, SNDRV_SEQ_EVENT_STOP, 0);
190 timer->running = 0;
191 return 0;
192 }
193
194
195 /*
196 * continue queue
197 */
198 int
snd_seq_oss_timer_continue(struct seq_oss_timer * timer)199 snd_seq_oss_timer_continue(struct seq_oss_timer *timer)
200 {
201 if (timer->running)
202 return 0;
203 send_timer_event(timer->dp, SNDRV_SEQ_EVENT_CONTINUE, 0);
204 timer->running = 1;
205 return 0;
206 }
207
208
209 /*
210 * change queue tempo
211 */
212 int
snd_seq_oss_timer_tempo(struct seq_oss_timer * timer,int value)213 snd_seq_oss_timer_tempo(struct seq_oss_timer *timer, int value)
214 {
215 if (value < MIN_OSS_TEMPO)
216 value = MIN_OSS_TEMPO;
217 else if (value > MAX_OSS_TEMPO)
218 value = MAX_OSS_TEMPO;
219 timer->oss_tempo = value;
220 calc_alsa_tempo(timer);
221 if (timer->running)
222 send_timer_event(timer->dp, SNDRV_SEQ_EVENT_TEMPO, timer->tempo);
223 return 0;
224 }
225
226
227 /*
228 * ioctls
229 */
230 int
snd_seq_oss_timer_ioctl(struct seq_oss_timer * timer,unsigned int cmd,int __user * arg)231 snd_seq_oss_timer_ioctl(struct seq_oss_timer *timer, unsigned int cmd, int __user *arg)
232 {
233 int value;
234
235 if (cmd == SNDCTL_SEQ_CTRLRATE) {
236 debug_printk(("ctrl rate\n"));
237 /* if *arg == 0, just return the current rate */
238 if (get_user(value, arg))
239 return -EFAULT;
240 if (value)
241 return -EINVAL;
242 value = ((timer->oss_tempo * timer->oss_timebase) + 30) / 60;
243 return put_user(value, arg) ? -EFAULT : 0;
244 }
245
246 if (timer->dp->seq_mode == SNDRV_SEQ_OSS_MODE_SYNTH)
247 return 0;
248
249 switch (cmd) {
250 case SNDCTL_TMR_START:
251 debug_printk(("timer start\n"));
252 return snd_seq_oss_timer_start(timer);
253 case SNDCTL_TMR_STOP:
254 debug_printk(("timer stop\n"));
255 return snd_seq_oss_timer_stop(timer);
256 case SNDCTL_TMR_CONTINUE:
257 debug_printk(("timer continue\n"));
258 return snd_seq_oss_timer_continue(timer);
259 case SNDCTL_TMR_TEMPO:
260 debug_printk(("timer tempo\n"));
261 if (get_user(value, arg))
262 return -EFAULT;
263 return snd_seq_oss_timer_tempo(timer, value);
264 case SNDCTL_TMR_TIMEBASE:
265 debug_printk(("timer timebase\n"));
266 if (get_user(value, arg))
267 return -EFAULT;
268 if (value < MIN_OSS_TIMEBASE)
269 value = MIN_OSS_TIMEBASE;
270 else if (value > MAX_OSS_TIMEBASE)
271 value = MAX_OSS_TIMEBASE;
272 timer->oss_timebase = value;
273 calc_alsa_tempo(timer);
274 return 0;
275
276 case SNDCTL_TMR_METRONOME:
277 case SNDCTL_TMR_SELECT:
278 case SNDCTL_TMR_SOURCE:
279 debug_printk(("timer XXX\n"));
280 /* not supported */
281 return 0;
282 }
283 return 0;
284 }
285