projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * Copyright (c) by Lee Revell <rlrevell@joe-job.com> | |
| 3 | * Clemens Ladisch <clemens@ladisch.de> | |
| 4 | * Routines for control of EMU10K1 chips | |
| 5 | * | |
| 6 | * BUGS: | |
| 7 | * -- | |
| 8 | * | |
| 9 | * TODO: | |
| 10 | * -- | |
| 11 | * | |
| 12 | * This program is free software; you can redistribute it and/or modify | |
| 13 | * it under the terms of the GNU General Public License as published by | |
| 14 | * the Free Software Foundation; either version 2 of the License, or | |
| 15 | * (at your option) any later version. | |
| 16 | * | |
| 17 | * This program is distributed in the hope that it will be useful, | |
| 18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 20 | * GNU General Public License for more details. | |
| 21 | * | |
| 22 | * You should have received a copy of the GNU General Public License | |
| 23 | * along with this program; if not, write to the Free Software | |
| 24 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 25 | * | |
| 26 | */ | |
| 27 | ||
| 28 | #include <sound/driver.h> | |
| 29 | #include <linux/time.h> | |
| 30 | #include <sound/core.h> | |
| 31 | #include <sound/emu10k1.h> | |
| 32 | ||
| eb4698f3 | 33 | static int snd_emu10k1_timer_start(struct snd_timer *timer) |
| 1da177e4 | 34 | { |
| eb4698f3 | 35 | struct snd_emu10k1 *emu; |
| 1da177e4 LT |
36 | unsigned long flags; |
| 37 | unsigned int delay; | |
| 38 | ||
| 39 | emu = snd_timer_chip(timer); | |
| 40 | delay = timer->sticks - 1; | |
| 41 | if (delay < 5 ) /* minimum time is 5 ticks */ | |
| 42 | delay = 5; | |
| 43 | spin_lock_irqsave(&emu->reg_lock, flags); | |
| 44 | snd_emu10k1_intr_enable(emu, INTE_INTERVALTIMERENB); | |
| 45 | outw(delay & TIMER_RATE_MASK, emu->port + TIMER); | |
| 46 | spin_unlock_irqrestore(&emu->reg_lock, flags); | |
| 47 | return 0; | |
| 48 | } | |
| 49 | ||
| eb4698f3 | 50 | static int snd_emu10k1_timer_stop(struct snd_timer *timer) |
| 1da177e4 | 51 | { |
| eb4698f3 | 52 | struct snd_emu10k1 *emu; |
| 1da177e4 LT |
53 | unsigned long flags; |
| 54 | ||
| 55 | emu = snd_timer_chip(timer); | |
| 56 | spin_lock_irqsave(&emu->reg_lock, flags); | |
| 57 | snd_emu10k1_intr_disable(emu, INTE_INTERVALTIMERENB); | |
| 58 | spin_unlock_irqrestore(&emu->reg_lock, flags); | |
| 59 | return 0; | |
| 60 | } | |
| 61 | ||
| eb4698f3 | 62 | static int snd_emu10k1_timer_precise_resolution(struct snd_timer *timer, |
| 1da177e4 LT |
63 | unsigned long *num, unsigned long *den) |
| 64 | { | |
| 65 | *num = 1; | |
| 66 | *den = 48000; | |
| 67 | return 0; | |
| 68 | } | |
| 69 | ||
| eb4698f3 | 70 | static struct snd_timer_hardware snd_emu10k1_timer_hw = { |
| 1da177e4 LT |
71 | .flags = SNDRV_TIMER_HW_AUTO, |
| 72 | .resolution = 20833, /* 1 sample @ 48KHZ = 20.833...us */ | |
| 73 | .ticks = 1024, | |
| 74 | .start = snd_emu10k1_timer_start, | |
| 75 | .stop = snd_emu10k1_timer_stop, | |
| 76 | .precise_resolution = snd_emu10k1_timer_precise_resolution, | |
| 77 | }; | |
| 78 | ||
| eb4698f3 | 79 | int __devinit snd_emu10k1_timer(struct snd_emu10k1 *emu, int device) |
| 1da177e4 | 80 | { |
| eb4698f3 TI |
81 | struct snd_timer *timer = NULL; |
| 82 | struct snd_timer_id tid; | |
| 1da177e4 LT |
83 | int err; |
| 84 | ||
| 85 | tid.dev_class = SNDRV_TIMER_CLASS_CARD; | |
| 86 | tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE; | |
| 87 | tid.card = emu->card->number; | |
| 88 | tid.device = device; | |
| 89 | tid.subdevice = 0; | |
| 90 | if ((err = snd_timer_new(emu->card, "EMU10K1", &tid, &timer)) >= 0) { | |
| 91 | strcpy(timer->name, "EMU10K1 timer"); | |
| 92 | timer->private_data = emu; | |
| 93 | timer->hw = snd_emu10k1_timer_hw; | |
| 94 | } | |
| 95 | emu->timer = timer; | |
| 96 | return err; | |
| 97 | } |