Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * sound/sys_timer.c | |
3 | * | |
4 | * The default timer for the Level 2 sequencer interface | |
5 | * Uses the (1/HZ sec) timer of kernel. | |
6 | */ | |
7 | /* | |
8 | * Copyright (C) by Hannu Savolainen 1993-1997 | |
9 | * | |
10 | * OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL) | |
11 | * Version 2 (June 1991). See the "COPYING" file distributed with this software | |
12 | * for more info. | |
13 | */ | |
14 | /* | |
15 | * Thomas Sailer : ioctl code reworked (vmalloc/vfree removed) | |
16 | * Andrew Veliath : adapted tmr2ticks from level 1 sequencer (avoid overflow) | |
17 | */ | |
18 | #include <linux/spinlock.h> | |
19 | #include "sound_config.h" | |
20 | ||
21 | static volatile int opened, tmr_running; | |
22 | static volatile time_t tmr_offs, tmr_ctr; | |
23 | static volatile unsigned long ticks_offs; | |
24 | static volatile int curr_tempo, curr_timebase; | |
25 | static volatile unsigned long curr_ticks; | |
26 | static volatile unsigned long next_event_time; | |
27 | static unsigned long prev_event_time; | |
28 | ||
29 | static void poll_def_tmr(unsigned long dummy); | |
30 | static DEFINE_SPINLOCK(lock); | |
31 | ||
32 | static struct timer_list def_tmr = TIMER_INITIALIZER(poll_def_tmr, 0, 0); | |
33 | ||
34 | static unsigned long | |
35 | tmr2ticks(int tmr_value) | |
36 | { | |
37 | /* | |
38 | * Convert timer ticks to MIDI ticks | |
39 | */ | |
40 | ||
41 | unsigned long tmp; | |
42 | unsigned long scale; | |
43 | ||
44 | /* tmr_value (ticks per sec) * | |
45 | 1000000 (usecs per sec) / HZ (ticks per sec) -=> usecs */ | |
46 | tmp = tmr_value * (1000000 / HZ); | |
47 | scale = (60 * 1000000) / (curr_tempo * curr_timebase); /* usecs per MIDI tick */ | |
48 | return (tmp + scale / 2) / scale; | |
49 | } | |
50 | ||
51 | static void | |
52 | poll_def_tmr(unsigned long dummy) | |
53 | { | |
54 | ||
55 | if (opened) | |
56 | { | |
57 | ||
58 | { | |
59 | def_tmr.expires = (1) + jiffies; | |
60 | add_timer(&def_tmr); | |
61 | }; | |
62 | ||
63 | if (tmr_running) | |
64 | { | |
65 | spin_lock(&lock); | |
66 | tmr_ctr++; | |
67 | curr_ticks = ticks_offs + tmr2ticks(tmr_ctr); | |
68 | ||
69 | if (curr_ticks >= next_event_time) | |
70 | { | |
71 | next_event_time = (unsigned long) -1; | |
72 | sequencer_timer(0); | |
73 | } | |
74 | spin_unlock(&lock); | |
75 | } | |
76 | } | |
77 | } | |
78 | ||
79 | static void | |
80 | tmr_reset(void) | |
81 | { | |
82 | unsigned long flags; | |
83 | ||
84 | spin_lock_irqsave(&lock,flags); | |
85 | tmr_offs = 0; | |
86 | ticks_offs = 0; | |
87 | tmr_ctr = 0; | |
88 | next_event_time = (unsigned long) -1; | |
89 | prev_event_time = 0; | |
90 | curr_ticks = 0; | |
91 | spin_unlock_irqrestore(&lock,flags); | |
92 | } | |
93 | ||
94 | static int | |
95 | def_tmr_open(int dev, int mode) | |
96 | { | |
97 | if (opened) | |
98 | return -EBUSY; | |
99 | ||
100 | tmr_reset(); | |
101 | curr_tempo = 60; | |
102 | curr_timebase = 100; | |
103 | opened = 1; | |
104 | ||
105 | ; | |
106 | ||
107 | { | |
108 | def_tmr.expires = (1) + jiffies; | |
109 | add_timer(&def_tmr); | |
110 | }; | |
111 | ||
112 | return 0; | |
113 | } | |
114 | ||
115 | static void | |
116 | def_tmr_close(int dev) | |
117 | { | |
118 | opened = tmr_running = 0; | |
119 | del_timer(&def_tmr); | |
120 | } | |
121 | ||
122 | static int | |
123 | def_tmr_event(int dev, unsigned char *event) | |
124 | { | |
125 | unsigned char cmd = event[1]; | |
126 | unsigned long parm = *(int *) &event[4]; | |
127 | ||
128 | switch (cmd) | |
129 | { | |
130 | case TMR_WAIT_REL: | |
131 | parm += prev_event_time; | |
132 | case TMR_WAIT_ABS: | |
133 | if (parm > 0) | |
134 | { | |
135 | long time; | |
136 | ||
137 | if (parm <= curr_ticks) /* It's the time */ | |
138 | return TIMER_NOT_ARMED; | |
139 | ||
140 | time = parm; | |
141 | next_event_time = prev_event_time = time; | |
142 | ||
143 | return TIMER_ARMED; | |
144 | } | |
145 | break; | |
146 | ||
147 | case TMR_START: | |
148 | tmr_reset(); | |
149 | tmr_running = 1; | |
150 | break; | |
151 | ||
152 | case TMR_STOP: | |
153 | tmr_running = 0; | |
154 | break; | |
155 | ||
156 | case TMR_CONTINUE: | |
157 | tmr_running = 1; | |
158 | break; | |
159 | ||
160 | case TMR_TEMPO: | |
161 | if (parm) | |
162 | { | |
163 | if (parm < 8) | |
164 | parm = 8; | |
165 | if (parm > 360) | |
166 | parm = 360; | |
167 | tmr_offs = tmr_ctr; | |
168 | ticks_offs += tmr2ticks(tmr_ctr); | |
169 | tmr_ctr = 0; | |
170 | curr_tempo = parm; | |
171 | } | |
172 | break; | |
173 | ||
174 | case TMR_ECHO: | |
175 | seq_copy_to_input(event, 8); | |
176 | break; | |
177 | ||
178 | default:; | |
179 | } | |
180 | ||
181 | return TIMER_NOT_ARMED; | |
182 | } | |
183 | ||
184 | static unsigned long | |
185 | def_tmr_get_time(int dev) | |
186 | { | |
187 | if (!opened) | |
188 | return 0; | |
189 | ||
190 | return curr_ticks; | |
191 | } | |
192 | ||
193 | /* same as sound_timer.c:timer_ioctl!? */ | |
194 | static int def_tmr_ioctl(int dev, unsigned int cmd, void __user *arg) | |
195 | { | |
196 | int __user *p = arg; | |
197 | int val; | |
198 | ||
199 | switch (cmd) { | |
200 | case SNDCTL_TMR_SOURCE: | |
201 | return __put_user(TMR_INTERNAL, p); | |
202 | ||
203 | case SNDCTL_TMR_START: | |
204 | tmr_reset(); | |
205 | tmr_running = 1; | |
206 | return 0; | |
207 | ||
208 | case SNDCTL_TMR_STOP: | |
209 | tmr_running = 0; | |
210 | return 0; | |
211 | ||
212 | case SNDCTL_TMR_CONTINUE: | |
213 | tmr_running = 1; | |
214 | return 0; | |
215 | ||
216 | case SNDCTL_TMR_TIMEBASE: | |
217 | if (__get_user(val, p)) | |
218 | return -EFAULT; | |
219 | if (val) { | |
220 | if (val < 1) | |
221 | val = 1; | |
222 | if (val > 1000) | |
223 | val = 1000; | |
224 | curr_timebase = val; | |
225 | } | |
226 | return __put_user(curr_timebase, p); | |
227 | ||
228 | case SNDCTL_TMR_TEMPO: | |
229 | if (__get_user(val, p)) | |
230 | return -EFAULT; | |
231 | if (val) { | |
232 | if (val < 8) | |
233 | val = 8; | |
234 | if (val > 250) | |
235 | val = 250; | |
236 | tmr_offs = tmr_ctr; | |
237 | ticks_offs += tmr2ticks(tmr_ctr); | |
238 | tmr_ctr = 0; | |
239 | curr_tempo = val; | |
240 | reprogram_timer(); | |
241 | } | |
242 | return __put_user(curr_tempo, p); | |
243 | ||
244 | case SNDCTL_SEQ_CTRLRATE: | |
245 | if (__get_user(val, p)) | |
246 | return -EFAULT; | |
247 | if (val != 0) /* Can't change */ | |
248 | return -EINVAL; | |
249 | val = ((curr_tempo * curr_timebase) + 30) / 60; | |
250 | return __put_user(val, p); | |
251 | ||
252 | case SNDCTL_SEQ_GETTIME: | |
253 | return __put_user(curr_ticks, p); | |
254 | ||
255 | case SNDCTL_TMR_METRONOME: | |
256 | /* NOP */ | |
257 | break; | |
258 | ||
259 | default:; | |
260 | } | |
261 | return -EINVAL; | |
262 | } | |
263 | ||
264 | static void | |
265 | def_tmr_arm(int dev, long time) | |
266 | { | |
267 | if (time < 0) | |
268 | time = curr_ticks + 1; | |
269 | else if (time <= curr_ticks) /* It's the time */ | |
270 | return; | |
271 | ||
272 | next_event_time = prev_event_time = time; | |
273 | ||
274 | return; | |
275 | } | |
276 | ||
277 | struct sound_timer_operations default_sound_timer = | |
278 | { | |
279 | .owner = THIS_MODULE, | |
280 | .info = {"System clock", 0}, | |
281 | .priority = 0, /* Priority */ | |
282 | .devlink = 0, /* Local device link */ | |
283 | .open = def_tmr_open, | |
284 | .close = def_tmr_close, | |
285 | .event = def_tmr_event, | |
286 | .get_time = def_tmr_get_time, | |
287 | .ioctl = def_tmr_ioctl, | |
288 | .arm_timer = def_tmr_arm | |
289 | }; |