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1da177e4 LT |
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> | |
5a0e3ad6 | 26 | #include <linux/slab.h> |
1da177e4 LT |
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 | */ | |
080dece3 TI |
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); | |
1da177e4 LT |
39 | |
40 | ||
41 | /* | |
42 | * create and register a new timer. | |
43 | * if queue is not started yet, start it. | |
44 | */ | |
080dece3 TI |
45 | struct seq_oss_timer * |
46 | snd_seq_oss_timer_new(struct seq_oss_devinfo *dp) | |
1da177e4 | 47 | { |
080dece3 | 48 | struct seq_oss_timer *rec; |
1da177e4 | 49 | |
ecca82b4 | 50 | rec = kzalloc(sizeof(*rec), GFP_KERNEL); |
1da177e4 LT |
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 | |
080dece3 | 71 | snd_seq_oss_timer_delete(struct seq_oss_timer *rec) |
1da177e4 LT |
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 | |
080dece3 | 86 | snd_seq_oss_process_timer_event(struct seq_oss_timer *rec, union evrec *ev) |
1da177e4 LT |
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 | |
080dece3 | 129 | calc_alsa_tempo(struct seq_oss_timer *timer) |
1da177e4 LT |
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 | |
080dece3 | 140 | send_timer_event(struct seq_oss_devinfo *dp, int type, int value) |
1da177e4 | 141 | { |
080dece3 | 142 | struct snd_seq_event ev; |
1da177e4 LT |
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 | |
080dece3 | 160 | snd_seq_oss_timer_start(struct seq_oss_timer *timer) |
1da177e4 | 161 | { |
080dece3 TI |
162 | struct seq_oss_devinfo *dp = timer->dp; |
163 | struct snd_seq_queue_tempo tmprec; | |
1da177e4 LT |
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 | |
080dece3 | 185 | snd_seq_oss_timer_stop(struct seq_oss_timer *timer) |
1da177e4 LT |
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 | |
080dece3 | 199 | snd_seq_oss_timer_continue(struct seq_oss_timer *timer) |
1da177e4 LT |
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 | |
080dece3 | 213 | snd_seq_oss_timer_tempo(struct seq_oss_timer *timer, int value) |
1da177e4 LT |
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 | |
080dece3 | 231 | snd_seq_oss_timer_ioctl(struct seq_oss_timer *timer, unsigned int cmd, int __user *arg) |
1da177e4 LT |
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 | } |