Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 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 | }; |