Home Home > GIT Browse > stable-xen
summaryrefslogtreecommitdiff
blob: 3a444a6f10ebc3d022aacea076eef5a7f81d4f9d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
/*
 * sound/oss/sound_timer.c
 */
/*
 * Copyright (C) by Hannu Savolainen 1993-1997
 *
 * OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
 * Version 2 (June 1991). See the "COPYING" file distributed with this software
 * for more info.
 */
/*
 * Thomas Sailer   : ioctl code reworked (vmalloc/vfree removed)
 */
#include <linux/string.h>
#include <linux/spinlock.h>

#include "sound_config.h"

static volatile int initialized, opened, tmr_running;
static volatile unsigned int tmr_offs, tmr_ctr;
static volatile unsigned long ticks_offs;
static volatile int curr_tempo, curr_timebase;
static volatile unsigned long curr_ticks;
static volatile unsigned long next_event_time;
static unsigned long prev_event_time;
static volatile unsigned long usecs_per_tmr;	/* Length of the current interval */

static struct sound_lowlev_timer *tmr;
static DEFINE_SPINLOCK(lock);

static unsigned long tmr2ticks(int tmr_value)
{
	/*
	 *    Convert timer ticks to MIDI ticks
	 */

	unsigned long tmp;
	unsigned long scale;

	tmp = tmr_value * usecs_per_tmr;	/* Convert to usecs */
	scale = (60 * 1000000) / (curr_tempo * curr_timebase);	/* usecs per MIDI tick */
	return (tmp + (scale / 2)) / scale;
}

void reprogram_timer(void)
{
	unsigned long   usecs_per_tick;

	/*
	 *	The user is changing the timer rate before setting a timer
	 *	slap, bad bad not allowed.
	 */
	 
	if(!tmr)
		return;
		
	usecs_per_tick = (60 * 1000000) / (curr_tempo * curr_timebase);

	/*
	 * Don't kill the system by setting too high timer rate
	 */
	if (usecs_per_tick < 2000)
		usecs_per_tick = 2000;

	usecs_per_tmr = tmr->tmr_start(tmr->dev, usecs_per_tick);
}

void sound_timer_syncinterval(unsigned int new_usecs)
{
	/*
	 *    This routine is called by the hardware level if
	 *      the clock frequency has changed for some reason.
	 */
	tmr_offs = tmr_ctr;
	ticks_offs += tmr2ticks(tmr_ctr);
	tmr_ctr = 0;
	usecs_per_tmr = new_usecs;
}
EXPORT_SYMBOL(sound_timer_syncinterval);

static void tmr_reset(void)
{
	unsigned long   flags;

	spin_lock_irqsave(&lock,flags);
	tmr_offs = 0;
	ticks_offs = 0;
	tmr_ctr = 0;
	next_event_time = (unsigned long) -1;
	prev_event_time = 0;
	curr_ticks = 0;
	spin_unlock_irqrestore(&lock,flags);
}

static int timer_open(int dev, int mode)
{
	if (opened)
		return -EBUSY;
	tmr_reset();
	curr_tempo = 60;
	curr_timebase = 100;
	opened = 1;
	reprogram_timer();
	return 0;
}

static void timer_close(int dev)
{
	opened = tmr_running = 0;
	tmr->tmr_disable(tmr->dev);
}

static int timer_event(int dev, unsigned char *event)
{
	unsigned char cmd = event[1];
	unsigned long parm = *(int *) &event[4];

	switch (cmd)
	{
		case TMR_WAIT_REL:
			parm += prev_event_time;
		case TMR_WAIT_ABS:
			if (parm > 0)
			{
				long time;

				if (parm <= curr_ticks)	/* It's the time */
					return TIMER_NOT_ARMED;
				time = parm;
				next_event_time = prev_event_time = time;
				return TIMER_ARMED;
			}
			break;

		case TMR_START:
			tmr_reset();
			tmr_running = 1;
			reprogram_timer();
			break;

		case TMR_STOP:
			tmr_running = 0;
			break;

		case TMR_CONTINUE:
			tmr_running = 1;
			reprogram_timer();
			break;

		case TMR_TEMPO:
			if (parm)
			{
				if (parm < 8)
					parm = 8;
				if (parm > 250)
					parm = 250;
				tmr_offs = tmr_ctr;
				ticks_offs += tmr2ticks(tmr_ctr);
				tmr_ctr = 0;
				curr_tempo = parm;
				reprogram_timer();
			}
			break;

		case TMR_ECHO:
			seq_copy_to_input(event, 8);
			break;

		default:;
	}
	return TIMER_NOT_ARMED;
}

static unsigned long timer_get_time(int dev)
{
	if (!opened)
		return 0;
	return curr_ticks;
}

static int timer_ioctl(int dev, unsigned int cmd, void __user *arg)
{
	int __user *p = arg;
	int val;

	switch (cmd) 
	{
		case SNDCTL_TMR_SOURCE:
			val = TMR_INTERNAL;
			break;

		case SNDCTL_TMR_START:
			tmr_reset();
			tmr_running = 1;
			return 0;
		
		case SNDCTL_TMR_STOP:
			tmr_running = 0;
			return 0;

		case SNDCTL_TMR_CONTINUE:
			tmr_running = 1;
			return 0;

		case SNDCTL_TMR_TIMEBASE:
			if (get_user(val, p))
				return -EFAULT;
			if (val) 
			{
				if (val < 1)
					val = 1;
				if (val > 1000)
					val = 1000;
				curr_timebase = val;
			}
			val = curr_timebase;
			break;

		case SNDCTL_TMR_TEMPO:
			if (get_user(val, p))
				return -EFAULT;
			if (val) 
			{
				if (val < 8)
					val = 8;
				if (val > 250)
					val = 250;
				tmr_offs = tmr_ctr;
				ticks_offs += tmr2ticks(tmr_ctr);
				tmr_ctr = 0;
				curr_tempo = val;
				reprogram_timer();
			}
			val = curr_tempo;
			break;

		case SNDCTL_SEQ_CTRLRATE:
			if (get_user(val, p))
				return -EFAULT;
			if (val != 0)	/* Can't change */
				return -EINVAL;
			val = ((curr_tempo * curr_timebase) + 30) / 60;
			break;
		
		case SNDCTL_SEQ_GETTIME:
			val = curr_ticks;
			break;
		
		case SNDCTL_TMR_METRONOME:
		default:
			return -EINVAL;
	}
	return put_user(val, p);
}

static void timer_arm(int dev, long time)
{
	if (time < 0)
		time = curr_ticks + 1;
	else if (time <= curr_ticks)	/* It's the time */
		return;

	next_event_time = prev_event_time = time;
	return;
}

static struct sound_timer_operations sound_timer =
{
	.owner		= THIS_MODULE,
	.info		= {"Sound Timer", 0},
	.priority	= 1,	/* Priority */
	.devlink	= 0,	/* Local device link */
	.open		= timer_open,
	.close		= timer_close,
	.event		= timer_event,
	.get_time	= timer_get_time,
	.ioctl		= timer_ioctl,
	.arm_timer	= timer_arm
};

void sound_timer_interrupt(void)
{
	unsigned long flags;
	
	if (!opened)
		return;

	tmr->tmr_restart(tmr->dev);

	if (!tmr_running)
		return;

	spin_lock_irqsave(&lock,flags);
	tmr_ctr++;
	curr_ticks = ticks_offs + tmr2ticks(tmr_ctr);

	if (curr_ticks >= next_event_time)
	{
		next_event_time = (unsigned long) -1;
		sequencer_timer(0);
	}
	spin_unlock_irqrestore(&lock,flags);
}
EXPORT_SYMBOL(sound_timer_interrupt);

void  sound_timer_init(struct sound_lowlev_timer *t, char *name)
{
	int n;

	if (initialized)
	{
		if (t->priority <= tmr->priority)
			return;	/* There is already a similar or better timer */
		tmr = t;
		return;
	}
	initialized = 1;
	tmr = t;

	n = sound_alloc_timerdev();
	if (n == -1)
		n = 0;		/* Overwrite the system timer */
	strlcpy(sound_timer.info.name, name, sizeof(sound_timer.info.name));
	sound_timer_devs[n] = &sound_timer;
}
EXPORT_SYMBOL(sound_timer_init);