| David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame^] | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 2 | /* |
| 3 | * Copyright (c) by Lee Revell <rlrevell@joe-job.com> |
| 4 | * Clemens Ladisch <clemens@ladisch.de> |
| 5 | * Routines for control of EMU10K1 chips |
| 6 | * |
| 7 | * BUGS: |
| 8 | * -- |
| 9 | * |
| 10 | * TODO: |
| 11 | * -- |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 12 | */ |
| 13 | |
| 14 | #include <linux/time.h> |
| 15 | #include <sound/core.h> |
| 16 | #include <sound/emu10k1.h> |
| 17 | |
| 18 | static int snd_emu10k1_timer_start(struct snd_timer *timer) |
| 19 | { |
| 20 | struct snd_emu10k1 *emu; |
| 21 | unsigned long flags; |
| 22 | unsigned int delay; |
| 23 | |
| 24 | emu = snd_timer_chip(timer); |
| 25 | delay = timer->sticks - 1; |
| 26 | if (delay < 5 ) /* minimum time is 5 ticks */ |
| 27 | delay = 5; |
| 28 | spin_lock_irqsave(&emu->reg_lock, flags); |
| 29 | snd_emu10k1_intr_enable(emu, INTE_INTERVALTIMERENB); |
| 30 | outw(delay & TIMER_RATE_MASK, emu->port + TIMER); |
| 31 | spin_unlock_irqrestore(&emu->reg_lock, flags); |
| 32 | return 0; |
| 33 | } |
| 34 | |
| 35 | static int snd_emu10k1_timer_stop(struct snd_timer *timer) |
| 36 | { |
| 37 | struct snd_emu10k1 *emu; |
| 38 | unsigned long flags; |
| 39 | |
| 40 | emu = snd_timer_chip(timer); |
| 41 | spin_lock_irqsave(&emu->reg_lock, flags); |
| 42 | snd_emu10k1_intr_disable(emu, INTE_INTERVALTIMERENB); |
| 43 | spin_unlock_irqrestore(&emu->reg_lock, flags); |
| 44 | return 0; |
| 45 | } |
| 46 | |
| 47 | static int snd_emu10k1_timer_precise_resolution(struct snd_timer *timer, |
| 48 | unsigned long *num, unsigned long *den) |
| 49 | { |
| 50 | *num = 1; |
| 51 | *den = 48000; |
| 52 | return 0; |
| 53 | } |
| 54 | |
| 55 | static struct snd_timer_hardware snd_emu10k1_timer_hw = { |
| 56 | .flags = SNDRV_TIMER_HW_AUTO, |
| 57 | .resolution = 20833, /* 1 sample @ 48KHZ = 20.833...us */ |
| 58 | .ticks = 1024, |
| 59 | .start = snd_emu10k1_timer_start, |
| 60 | .stop = snd_emu10k1_timer_stop, |
| 61 | .precise_resolution = snd_emu10k1_timer_precise_resolution, |
| 62 | }; |
| 63 | |
| 64 | int snd_emu10k1_timer(struct snd_emu10k1 *emu, int device) |
| 65 | { |
| 66 | struct snd_timer *timer = NULL; |
| 67 | struct snd_timer_id tid; |
| 68 | int err; |
| 69 | |
| 70 | tid.dev_class = SNDRV_TIMER_CLASS_CARD; |
| 71 | tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE; |
| 72 | tid.card = emu->card->number; |
| 73 | tid.device = device; |
| 74 | tid.subdevice = 0; |
| 75 | if ((err = snd_timer_new(emu->card, "EMU10K1", &tid, &timer)) >= 0) { |
| 76 | strcpy(timer->name, "EMU10K1 timer"); |
| 77 | timer->private_data = emu; |
| 78 | timer->hw = snd_emu10k1_timer_hw; |
| 79 | } |
| 80 | emu->timer = timer; |
| 81 | return err; |
| 82 | } |