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 21static volatile int opened, tmr_running; 22static volatile time_t tmr_offs, tmr_ctr; 23static volatile unsigned long ticks_offs; 24static volatile int curr_tempo, curr_timebase; 25static volatile unsigned long curr_ticks; 26static volatile unsigned long next_event_time; 27static unsigned long prev_event_time; 28 29static void poll_def_tmr(unsigned long dummy); 30static DEFINE_SPINLOCK(lock); 31static DEFINE_TIMER(def_tmr, poll_def_tmr, 0, 0); 32 33static unsigned long 34tmr2ticks(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 50static void 51poll_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 78static void 79tmr_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 93static int 94def_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 111static void 112def_tmr_close(int dev) 113{ 114 opened = tmr_running = 0; 115 del_timer(&def_tmr); 116} 117 118static int 119def_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 180static unsigned long 181def_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!? */ 190static 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 260static void 261def_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 273struct 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