diff options
Diffstat (limited to 'sound/core/hrtimer.c')
| -rw-r--r-- | sound/core/hrtimer.c | 155 |
1 files changed, 0 insertions, 155 deletions
diff --git a/sound/core/hrtimer.c b/sound/core/hrtimer.c deleted file mode 100644 index c1d285921f80..000000000000 --- a/sound/core/hrtimer.c +++ /dev/null @@ -1,155 +0,0 @@ -/* - * ALSA timer back-end using hrtimer - * Copyright (C) 2008 Takashi Iwai - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - * - */ - -#include <linux/init.h> -#include <linux/module.h> -#include <linux/moduleparam.h> -#include <linux/hrtimer.h> -#include <sound/core.h> -#include <sound/timer.h> - -MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>"); -MODULE_DESCRIPTION("ALSA hrtimer backend"); -MODULE_LICENSE("GPL"); - -MODULE_ALIAS("snd-timer-" __stringify(SNDRV_TIMER_GLOBAL_HRTIMER)); - -#define NANO_SEC 1000000000UL /* 10^9 in sec */ -static unsigned int resolution; - -struct snd_hrtimer { - struct snd_timer *timer; - struct hrtimer hrt; -}; - -static enum hrtimer_restart snd_hrtimer_callback(struct hrtimer *hrt) -{ - struct snd_hrtimer *stime = container_of(hrt, struct snd_hrtimer, hrt); - struct snd_timer *t = stime->timer; - hrtimer_forward_now(hrt, ns_to_ktime(t->sticks * resolution)); - snd_timer_interrupt(stime->timer, t->sticks); - return HRTIMER_RESTART; -} - -static int snd_hrtimer_open(struct snd_timer *t) -{ - struct snd_hrtimer *stime; - - stime = kmalloc(sizeof(*stime), GFP_KERNEL); - if (!stime) - return -ENOMEM; - hrtimer_init(&stime->hrt, CLOCK_MONOTONIC, HRTIMER_MODE_REL); - stime->timer = t; - stime->hrt.cb_mode = HRTIMER_CB_IRQSAFE_UNLOCKED; - stime->hrt.function = snd_hrtimer_callback; - t->private_data = stime; - return 0; -} - -static int snd_hrtimer_close(struct snd_timer *t) -{ - struct snd_hrtimer *stime = t->private_data; - - if (stime) { - hrtimer_cancel(&stime->hrt); - kfree(stime); - t->private_data = NULL; - } - return 0; -} - -static int snd_hrtimer_start(struct snd_timer *t) -{ - struct snd_hrtimer *stime = t->private_data; - - hrtimer_start(&stime->hrt, ns_to_ktime(t->sticks * resolution), - HRTIMER_MODE_REL); - return 0; -} - -static int snd_hrtimer_stop(struct snd_timer *t) -{ - struct snd_hrtimer *stime = t->private_data; - - hrtimer_cancel(&stime->hrt); - return 0; -} - -static struct snd_timer_hardware hrtimer_hw = { - .flags = SNDRV_TIMER_HW_AUTO, - .open = snd_hrtimer_open, - .close = snd_hrtimer_close, - .start = snd_hrtimer_start, - .stop = snd_hrtimer_stop, -}; - -/* - * entry functions - */ - -static struct snd_timer *mytimer; - -static int __init snd_hrtimer_init(void) -{ - struct snd_timer *timer; - struct timespec tp; - int err; - - hrtimer_get_res(CLOCK_MONOTONIC, &tp); - if (tp.tv_sec > 0 || !tp.tv_nsec) { - snd_printk(KERN_ERR - "snd-hrtimer: Invalid resolution %u.%09u", - (unsigned)tp.tv_sec, (unsigned)tp.tv_nsec); - return -EINVAL; - } - resolution = tp.tv_nsec; - - /* Create a new timer and set up the fields */ - err = snd_timer_global_new("hrtimer", SNDRV_TIMER_GLOBAL_HRTIMER, - &timer); - if (err < 0) - return err; - - timer->module = THIS_MODULE; - strcpy(timer->name, "HR timer"); - timer->hw = hrtimer_hw; - timer->hw.resolution = resolution; - timer->hw.ticks = NANO_SEC / resolution; - - err = snd_timer_global_register(timer); - if (err < 0) { - snd_timer_global_free(timer); - return err; - } - mytimer = timer; /* remember this */ - - return 0; -} - -static void __exit snd_hrtimer_exit(void) -{ - if (mytimer) { - snd_timer_global_free(mytimer); - mytimer = NULL; - } -} - -module_init(snd_hrtimer_init); -module_exit(snd_hrtimer_exit); |