Commit | Line | Data |
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1da177e4 | 1 | /* |
f30c2269 | 2 | * sound/oss/sound_timer.c |
1da177e4 LT |
3 | */ |
4 | /* | |
5 | * Copyright (C) by Hannu Savolainen 1993-1997 | |
6 | * | |
7 | * OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL) | |
8 | * Version 2 (June 1991). See the "COPYING" file distributed with this software | |
9 | * for more info. | |
10 | */ | |
11 | /* | |
12 | * Thomas Sailer : ioctl code reworked (vmalloc/vfree removed) | |
13 | */ | |
14 | #include <linux/string.h> | |
15 | #include <linux/spinlock.h> | |
16 | ||
17 | #include "sound_config.h" | |
18 | ||
19 | static volatile int initialized, opened, tmr_running; | |
20 | static volatile time_t tmr_offs, tmr_ctr; | |
21 | static volatile unsigned long ticks_offs; | |
22 | static volatile int curr_tempo, curr_timebase; | |
23 | static volatile unsigned long curr_ticks; | |
24 | static volatile unsigned long next_event_time; | |
25 | static unsigned long prev_event_time; | |
26 | static volatile unsigned long usecs_per_tmr; /* Length of the current interval */ | |
27 | ||
28 | static struct sound_lowlev_timer *tmr; | |
3182c8a7 | 29 | static DEFINE_SPINLOCK(lock); |
1da177e4 LT |
30 | |
31 | static unsigned long tmr2ticks(int tmr_value) | |
32 | { | |
33 | /* | |
34 | * Convert timer ticks to MIDI ticks | |
35 | */ | |
36 | ||
37 | unsigned long tmp; | |
38 | unsigned long scale; | |
39 | ||
40 | tmp = tmr_value * usecs_per_tmr; /* Convert to usecs */ | |
41 | scale = (60 * 1000000) / (curr_tempo * curr_timebase); /* usecs per MIDI tick */ | |
42 | return (tmp + (scale / 2)) / scale; | |
43 | } | |
44 | ||
45 | void reprogram_timer(void) | |
46 | { | |
47 | unsigned long usecs_per_tick; | |
48 | ||
49 | /* | |
50 | * The user is changing the timer rate before setting a timer | |
51 | * slap, bad bad not allowed. | |
52 | */ | |
53 | ||
54 | if(!tmr) | |
55 | return; | |
56 | ||
57 | usecs_per_tick = (60 * 1000000) / (curr_tempo * curr_timebase); | |
58 | ||
59 | /* | |
60 | * Don't kill the system by setting too high timer rate | |
61 | */ | |
62 | if (usecs_per_tick < 2000) | |
63 | usecs_per_tick = 2000; | |
64 | ||
65 | usecs_per_tmr = tmr->tmr_start(tmr->dev, usecs_per_tick); | |
66 | } | |
67 | ||
68 | void sound_timer_syncinterval(unsigned int new_usecs) | |
69 | { | |
70 | /* | |
71 | * This routine is called by the hardware level if | |
72 | * the clock frequency has changed for some reason. | |
73 | */ | |
74 | tmr_offs = tmr_ctr; | |
75 | ticks_offs += tmr2ticks(tmr_ctr); | |
76 | tmr_ctr = 0; | |
77 | usecs_per_tmr = new_usecs; | |
78 | } | |
ece7f77b | 79 | EXPORT_SYMBOL(sound_timer_syncinterval); |
1da177e4 LT |
80 | |
81 | static void tmr_reset(void) | |
82 | { | |
83 | unsigned long flags; | |
84 | ||
85 | spin_lock_irqsave(&lock,flags); | |
86 | tmr_offs = 0; | |
87 | ticks_offs = 0; | |
88 | tmr_ctr = 0; | |
89 | next_event_time = (unsigned long) -1; | |
90 | prev_event_time = 0; | |
91 | curr_ticks = 0; | |
92 | spin_unlock_irqrestore(&lock,flags); | |
93 | } | |
94 | ||
95 | static int timer_open(int dev, int mode) | |
96 | { | |
97 | if (opened) | |
98 | return -EBUSY; | |
99 | tmr_reset(); | |
100 | curr_tempo = 60; | |
101 | curr_timebase = 100; | |
102 | opened = 1; | |
103 | reprogram_timer(); | |
104 | return 0; | |
105 | } | |
106 | ||
107 | static void timer_close(int dev) | |
108 | { | |
109 | opened = tmr_running = 0; | |
110 | tmr->tmr_disable(tmr->dev); | |
111 | } | |
112 | ||
113 | static int timer_event(int dev, unsigned char *event) | |
114 | { | |
115 | unsigned char cmd = event[1]; | |
116 | unsigned long parm = *(int *) &event[4]; | |
117 | ||
118 | switch (cmd) | |
119 | { | |
120 | case TMR_WAIT_REL: | |
121 | parm += prev_event_time; | |
122 | case TMR_WAIT_ABS: | |
123 | if (parm > 0) | |
124 | { | |
125 | long time; | |
126 | ||
127 | if (parm <= curr_ticks) /* It's the time */ | |
128 | return TIMER_NOT_ARMED; | |
129 | time = parm; | |
130 | next_event_time = prev_event_time = time; | |
131 | return TIMER_ARMED; | |
132 | } | |
133 | break; | |
134 | ||
135 | case TMR_START: | |
136 | tmr_reset(); | |
137 | tmr_running = 1; | |
138 | reprogram_timer(); | |
139 | break; | |
140 | ||
141 | case TMR_STOP: | |
142 | tmr_running = 0; | |
143 | break; | |
144 | ||
145 | case TMR_CONTINUE: | |
146 | tmr_running = 1; | |
147 | reprogram_timer(); | |
148 | break; | |
149 | ||
150 | case TMR_TEMPO: | |
151 | if (parm) | |
152 | { | |
153 | if (parm < 8) | |
154 | parm = 8; | |
155 | if (parm > 250) | |
156 | parm = 250; | |
157 | tmr_offs = tmr_ctr; | |
158 | ticks_offs += tmr2ticks(tmr_ctr); | |
159 | tmr_ctr = 0; | |
160 | curr_tempo = parm; | |
161 | reprogram_timer(); | |
162 | } | |
163 | break; | |
164 | ||
165 | case TMR_ECHO: | |
166 | seq_copy_to_input(event, 8); | |
167 | break; | |
168 | ||
169 | default:; | |
170 | } | |
171 | return TIMER_NOT_ARMED; | |
172 | } | |
173 | ||
174 | static unsigned long timer_get_time(int dev) | |
175 | { | |
176 | if (!opened) | |
177 | return 0; | |
178 | return curr_ticks; | |
179 | } | |
180 | ||
181 | static int timer_ioctl(int dev, unsigned int cmd, void __user *arg) | |
182 | { | |
183 | int __user *p = arg; | |
184 | int val; | |
185 | ||
186 | switch (cmd) | |
187 | { | |
188 | case SNDCTL_TMR_SOURCE: | |
189 | val = TMR_INTERNAL; | |
190 | break; | |
191 | ||
192 | case SNDCTL_TMR_START: | |
193 | tmr_reset(); | |
194 | tmr_running = 1; | |
195 | return 0; | |
196 | ||
197 | case SNDCTL_TMR_STOP: | |
198 | tmr_running = 0; | |
199 | return 0; | |
200 | ||
201 | case SNDCTL_TMR_CONTINUE: | |
202 | tmr_running = 1; | |
203 | return 0; | |
204 | ||
205 | case SNDCTL_TMR_TIMEBASE: | |
206 | if (get_user(val, p)) | |
207 | return -EFAULT; | |
208 | if (val) | |
209 | { | |
210 | if (val < 1) | |
211 | val = 1; | |
212 | if (val > 1000) | |
213 | val = 1000; | |
214 | curr_timebase = val; | |
215 | } | |
216 | val = curr_timebase; | |
217 | break; | |
218 | ||
219 | case SNDCTL_TMR_TEMPO: | |
220 | if (get_user(val, p)) | |
221 | return -EFAULT; | |
222 | if (val) | |
223 | { | |
224 | if (val < 8) | |
225 | val = 8; | |
226 | if (val > 250) | |
227 | val = 250; | |
228 | tmr_offs = tmr_ctr; | |
229 | ticks_offs += tmr2ticks(tmr_ctr); | |
230 | tmr_ctr = 0; | |
231 | curr_tempo = val; | |
232 | reprogram_timer(); | |
233 | } | |
234 | val = curr_tempo; | |
235 | break; | |
236 | ||
237 | case SNDCTL_SEQ_CTRLRATE: | |
238 | if (get_user(val, p)) | |
239 | return -EFAULT; | |
240 | if (val != 0) /* Can't change */ | |
241 | return -EINVAL; | |
242 | val = ((curr_tempo * curr_timebase) + 30) / 60; | |
243 | break; | |
244 | ||
245 | case SNDCTL_SEQ_GETTIME: | |
246 | val = curr_ticks; | |
247 | break; | |
248 | ||
249 | case SNDCTL_TMR_METRONOME: | |
250 | default: | |
251 | return -EINVAL; | |
252 | } | |
253 | return put_user(val, p); | |
254 | } | |
255 | ||
256 | static void timer_arm(int dev, long time) | |
257 | { | |
258 | if (time < 0) | |
259 | time = curr_ticks + 1; | |
260 | else if (time <= curr_ticks) /* It's the time */ | |
261 | return; | |
262 | ||
263 | next_event_time = prev_event_time = time; | |
264 | return; | |
265 | } | |
266 | ||
267 | static struct sound_timer_operations sound_timer = | |
268 | { | |
269 | .owner = THIS_MODULE, | |
270 | .info = {"Sound Timer", 0}, | |
271 | .priority = 1, /* Priority */ | |
272 | .devlink = 0, /* Local device link */ | |
273 | .open = timer_open, | |
274 | .close = timer_close, | |
275 | .event = timer_event, | |
276 | .get_time = timer_get_time, | |
277 | .ioctl = timer_ioctl, | |
278 | .arm_timer = timer_arm | |
279 | }; | |
280 | ||
281 | void sound_timer_interrupt(void) | |
282 | { | |
283 | unsigned long flags; | |
284 | ||
285 | if (!opened) | |
286 | return; | |
287 | ||
288 | tmr->tmr_restart(tmr->dev); | |
289 | ||
290 | if (!tmr_running) | |
291 | return; | |
292 | ||
293 | spin_lock_irqsave(&lock,flags); | |
294 | tmr_ctr++; | |
295 | curr_ticks = ticks_offs + tmr2ticks(tmr_ctr); | |
296 | ||
297 | if (curr_ticks >= next_event_time) | |
298 | { | |
299 | next_event_time = (unsigned long) -1; | |
300 | sequencer_timer(0); | |
301 | } | |
302 | spin_unlock_irqrestore(&lock,flags); | |
303 | } | |
ece7f77b | 304 | EXPORT_SYMBOL(sound_timer_interrupt); |
1da177e4 LT |
305 | |
306 | void sound_timer_init(struct sound_lowlev_timer *t, char *name) | |
307 | { | |
308 | int n; | |
309 | ||
310 | if (initialized) | |
311 | { | |
312 | if (t->priority <= tmr->priority) | |
313 | return; /* There is already a similar or better timer */ | |
314 | tmr = t; | |
315 | return; | |
316 | } | |
317 | initialized = 1; | |
318 | tmr = t; | |
319 | ||
320 | n = sound_alloc_timerdev(); | |
321 | if (n == -1) | |
322 | n = 0; /* Overwrite the system timer */ | |
bb690c9e | 323 | strlcpy(sound_timer.info.name, name, sizeof(sound_timer.info.name)); |
1da177e4 LT |
324 | sound_timer_devs[n] = &sound_timer; |
325 | } | |
ece7f77b AB |
326 | EXPORT_SYMBOL(sound_timer_init); |
327 |