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Linux/sound/oss/sys_timer.c

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

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