ALSA: dummy - Support high-res timer mode
Allow snd-dummy driver to use high-res timer as its timing source instead of the system timer. The new module option "hrtimer" is added to turn on/off the high-res timer support. It can be switched even dynamically via sysfs. Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai
parent
326ba5010a
commit
c631d03c68
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@ -25,6 +25,8 @@
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#include <linux/slab.h>
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#include <linux/time.h>
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#include <linux/wait.h>
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#include <linux/hrtimer.h>
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#include <linux/math64.h>
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#include <linux/moduleparam.h>
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#include <sound/core.h>
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#include <sound/control.h>
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@ -148,6 +150,9 @@ static int enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0};
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static int pcm_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1};
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static int pcm_substreams[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 8};
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//static int midi_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 2};
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#ifdef CONFIG_HIGH_RES_TIMERS
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static int hrtimer = 1;
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#endif
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module_param_array(index, int, NULL, 0444);
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MODULE_PARM_DESC(index, "Index value for dummy soundcard.");
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@ -161,6 +166,10 @@ module_param_array(pcm_substreams, int, NULL, 0444);
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MODULE_PARM_DESC(pcm_substreams, "PCM substreams # (1-16) for dummy driver.");
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//module_param_array(midi_devs, int, NULL, 0444);
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//MODULE_PARM_DESC(midi_devs, "MIDI devices # (0-2) for dummy driver.");
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#ifdef CONFIG_HIGH_RES_TIMERS
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module_param(hrtimer, bool, 0644);
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MODULE_PARM_DESC(hrtimer, "Use hrtimer as the timer source.");
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#endif
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static struct platform_device *devices[SNDRV_CARDS];
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@ -171,16 +180,29 @@ static struct platform_device *devices[SNDRV_CARDS];
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#define MIXER_ADDR_CD 4
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#define MIXER_ADDR_LAST 4
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struct dummy_timer_ops {
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int (*create)(struct snd_pcm_substream *);
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void (*free)(struct snd_pcm_substream *);
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int (*prepare)(struct snd_pcm_substream *);
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int (*start)(struct snd_pcm_substream *);
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int (*stop)(struct snd_pcm_substream *);
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snd_pcm_uframes_t (*pointer)(struct snd_pcm_substream *);
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};
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struct snd_dummy {
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struct snd_card *card;
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struct snd_pcm *pcm;
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spinlock_t mixer_lock;
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int mixer_volume[MIXER_ADDR_LAST+1][2];
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int capture_source[MIXER_ADDR_LAST+1][2];
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const struct dummy_timer_ops *timer_ops;
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};
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struct snd_dummy_pcm {
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struct snd_dummy *dummy;
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/*
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* system timer interface
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*/
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struct dummy_systimer_pcm {
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spinlock_t lock;
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struct timer_list timer;
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unsigned int pcm_buffer_size;
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@ -192,46 +214,29 @@ struct snd_dummy_pcm {
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struct snd_pcm_substream *substream;
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};
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static inline void snd_card_dummy_pcm_timer_start(struct snd_dummy_pcm *dpcm)
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static int dummy_systimer_start(struct snd_pcm_substream *substream)
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{
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struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
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spin_lock(&dpcm->lock);
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dpcm->timer.expires = 1 + jiffies;
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add_timer(&dpcm->timer);
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}
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static inline void snd_card_dummy_pcm_timer_stop(struct snd_dummy_pcm *dpcm)
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{
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del_timer(&dpcm->timer);
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}
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static int snd_card_dummy_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct snd_dummy_pcm *dpcm = runtime->private_data;
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int err = 0;
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spin_lock(&dpcm->lock);
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switch (cmd) {
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case SNDRV_PCM_TRIGGER_START:
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case SNDRV_PCM_TRIGGER_RESUME:
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snd_card_dummy_pcm_timer_start(dpcm);
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break;
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case SNDRV_PCM_TRIGGER_STOP:
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case SNDRV_PCM_TRIGGER_SUSPEND:
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snd_card_dummy_pcm_timer_stop(dpcm);
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break;
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default:
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err = -EINVAL;
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break;
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}
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spin_unlock(&dpcm->lock);
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return 0;
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}
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static int snd_card_dummy_pcm_prepare(struct snd_pcm_substream *substream)
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static int dummy_systimer_stop(struct snd_pcm_substream *substream)
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{
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struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
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spin_lock(&dpcm->lock);
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del_timer(&dpcm->timer);
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spin_unlock(&dpcm->lock);
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return 0;
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}
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static int dummy_systimer_prepare(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct snd_dummy_pcm *dpcm = runtime->private_data;
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struct dummy_systimer_pcm *dpcm = runtime->private_data;
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int bps;
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bps = snd_pcm_format_width(runtime->format) * runtime->rate *
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@ -247,15 +252,12 @@ static int snd_card_dummy_pcm_prepare(struct snd_pcm_substream *substream)
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dpcm->pcm_irq_pos = 0;
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dpcm->pcm_buf_pos = 0;
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snd_pcm_format_set_silence(runtime->format, runtime->dma_area,
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bytes_to_samples(runtime, runtime->dma_bytes));
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return 0;
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}
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static void snd_card_dummy_pcm_timer_function(unsigned long data)
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static void dummy_systimer_callback(unsigned long data)
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{
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struct snd_dummy_pcm *dpcm = (struct snd_dummy_pcm *)data;
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struct dummy_systimer_pcm *dpcm = (struct dummy_systimer_pcm *)data;
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unsigned long flags;
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spin_lock_irqsave(&dpcm->lock, flags);
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@ -272,18 +274,212 @@ static void snd_card_dummy_pcm_timer_function(unsigned long data)
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spin_unlock_irqrestore(&dpcm->lock, flags);
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}
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static snd_pcm_uframes_t snd_card_dummy_pcm_pointer(struct snd_pcm_substream *substream)
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static snd_pcm_uframes_t
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dummy_systimer_pointer(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct snd_dummy_pcm *dpcm = runtime->private_data;
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struct dummy_systimer_pcm *dpcm = runtime->private_data;
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return bytes_to_frames(runtime, dpcm->pcm_buf_pos / dpcm->pcm_hz);
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}
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static struct snd_pcm_hardware snd_card_dummy_playback =
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static int dummy_systimer_create(struct snd_pcm_substream *substream)
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{
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.info = (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
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SNDRV_PCM_INFO_RESUME | SNDRV_PCM_INFO_MMAP_VALID),
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struct dummy_systimer_pcm *dpcm;
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dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
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if (!dpcm)
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return -ENOMEM;
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substream->runtime->private_data = dpcm;
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init_timer(&dpcm->timer);
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dpcm->timer.data = (unsigned long) dpcm;
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dpcm->timer.function = dummy_systimer_callback;
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spin_lock_init(&dpcm->lock);
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dpcm->substream = substream;
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return 0;
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}
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static void dummy_systimer_free(struct snd_pcm_substream *substream)
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{
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kfree(substream->runtime->private_data);
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}
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static struct dummy_timer_ops dummy_systimer_ops = {
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.create = dummy_systimer_create,
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.free = dummy_systimer_free,
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.prepare = dummy_systimer_prepare,
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.start = dummy_systimer_start,
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.stop = dummy_systimer_stop,
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.pointer = dummy_systimer_pointer,
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};
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#ifdef CONFIG_HIGH_RES_TIMERS
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/*
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* hrtimer interface
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*/
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struct dummy_hrtimer_pcm {
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ktime_t base_time;
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ktime_t period_time;
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atomic_t running;
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struct hrtimer timer;
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struct tasklet_struct tasklet;
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struct snd_pcm_substream *substream;
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};
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static void dummy_hrtimer_pcm_elapsed(unsigned long priv)
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{
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struct dummy_hrtimer_pcm *dpcm = (struct dummy_hrtimer_pcm *)priv;
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if (atomic_read(&dpcm->running))
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snd_pcm_period_elapsed(dpcm->substream);
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}
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static enum hrtimer_restart dummy_hrtimer_callback(struct hrtimer *timer)
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{
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struct dummy_hrtimer_pcm *dpcm;
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dpcm = container_of(timer, struct dummy_hrtimer_pcm, timer);
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if (!atomic_read(&dpcm->running))
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return HRTIMER_NORESTART;
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tasklet_schedule(&dpcm->tasklet);
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hrtimer_forward_now(timer, dpcm->period_time);
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return HRTIMER_RESTART;
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}
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static int dummy_hrtimer_start(struct snd_pcm_substream *substream)
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{
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struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
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dpcm->base_time = hrtimer_cb_get_time(&dpcm->timer);
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hrtimer_start(&dpcm->timer, dpcm->period_time, HRTIMER_MODE_REL);
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atomic_set(&dpcm->running, 1);
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return 0;
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}
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static int dummy_hrtimer_stop(struct snd_pcm_substream *substream)
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{
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struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
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atomic_set(&dpcm->running, 0);
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hrtimer_cancel(&dpcm->timer);
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return 0;
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}
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static inline void dummy_hrtimer_sync(struct dummy_hrtimer_pcm *dpcm)
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{
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tasklet_kill(&dpcm->tasklet);
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}
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static snd_pcm_uframes_t
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dummy_hrtimer_pointer(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct dummy_hrtimer_pcm *dpcm = runtime->private_data;
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u64 delta;
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u32 pos;
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delta = ktime_us_delta(hrtimer_cb_get_time(&dpcm->timer),
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dpcm->base_time);
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delta = div_u64(delta * runtime->rate + 999999, 1000000);
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div_u64_rem(delta, runtime->buffer_size, &pos);
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return pos;
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}
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static int dummy_hrtimer_prepare(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct dummy_hrtimer_pcm *dpcm = runtime->private_data;
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unsigned int period, rate;
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long sec;
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unsigned long nsecs;
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dummy_hrtimer_sync(dpcm);
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period = runtime->period_size;
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rate = runtime->rate;
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sec = period / rate;
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period %= rate;
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nsecs = div_u64((u64)period * 1000000000UL + rate - 1, rate);
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dpcm->period_time = ktime_set(sec, nsecs);
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return 0;
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}
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static int dummy_hrtimer_create(struct snd_pcm_substream *substream)
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{
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struct dummy_hrtimer_pcm *dpcm;
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dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
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if (!dpcm)
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return -ENOMEM;
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substream->runtime->private_data = dpcm;
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hrtimer_init(&dpcm->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
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dpcm->timer.function = dummy_hrtimer_callback;
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dpcm->substream = substream;
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atomic_set(&dpcm->running, 0);
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tasklet_init(&dpcm->tasklet, dummy_hrtimer_pcm_elapsed,
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(unsigned long)dpcm);
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return 0;
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}
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static void dummy_hrtimer_free(struct snd_pcm_substream *substream)
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{
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struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
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dummy_hrtimer_sync(dpcm);
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kfree(dpcm);
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}
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static struct dummy_timer_ops dummy_hrtimer_ops = {
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.create = dummy_hrtimer_create,
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.free = dummy_hrtimer_free,
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.prepare = dummy_hrtimer_prepare,
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.start = dummy_hrtimer_start,
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.stop = dummy_hrtimer_stop,
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.pointer = dummy_hrtimer_pointer,
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};
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#endif /* CONFIG_HIGH_RES_TIMERS */
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/*
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* PCM interface
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*/
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static int dummy_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
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{
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struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
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switch (cmd) {
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case SNDRV_PCM_TRIGGER_START:
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case SNDRV_PCM_TRIGGER_RESUME:
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return dummy->timer_ops->start(substream);
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case SNDRV_PCM_TRIGGER_STOP:
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case SNDRV_PCM_TRIGGER_SUSPEND:
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return dummy->timer_ops->stop(substream);
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}
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return -EINVAL;
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}
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static int dummy_pcm_prepare(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
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snd_pcm_format_set_silence(runtime->format, runtime->dma_area,
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bytes_to_samples(runtime, runtime->dma_bytes));
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return dummy->timer_ops->prepare(substream);
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}
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static snd_pcm_uframes_t dummy_pcm_pointer(struct snd_pcm_substream *substream)
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{
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struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
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return dummy->timer_ops->pointer(substream);
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}
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static struct snd_pcm_hardware dummy_pcm_hardware = {
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.info = (SNDRV_PCM_INFO_MMAP |
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SNDRV_PCM_INFO_INTERLEAVED |
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SNDRV_PCM_INFO_RESUME |
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SNDRV_PCM_INFO_MMAP_VALID),
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.formats = USE_FORMATS,
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.rates = USE_RATE,
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.rate_min = USE_RATE_MIN,
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@ -298,135 +494,70 @@ static struct snd_pcm_hardware snd_card_dummy_playback =
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.fifo_size = 0,
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};
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static struct snd_pcm_hardware snd_card_dummy_capture =
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static int dummy_pcm_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *hw_params)
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{
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.info = (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
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SNDRV_PCM_INFO_RESUME | SNDRV_PCM_INFO_MMAP_VALID),
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.formats = USE_FORMATS,
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.rates = USE_RATE,
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.rate_min = USE_RATE_MIN,
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.rate_max = USE_RATE_MAX,
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.channels_min = USE_CHANNELS_MIN,
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.channels_max = USE_CHANNELS_MAX,
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.buffer_bytes_max = MAX_BUFFER_SIZE,
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.period_bytes_min = 64,
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.period_bytes_max = MAX_PERIOD_SIZE,
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.periods_min = USE_PERIODS_MIN,
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.periods_max = USE_PERIODS_MAX,
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.fifo_size = 0,
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};
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static void snd_card_dummy_runtime_free(struct snd_pcm_runtime *runtime)
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{
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kfree(runtime->private_data);
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return snd_pcm_lib_malloc_pages(substream,
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params_buffer_bytes(hw_params));
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}
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static int snd_card_dummy_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *hw_params)
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{
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return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params));
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}
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static int snd_card_dummy_hw_free(struct snd_pcm_substream *substream)
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static int dummy_pcm_hw_free(struct snd_pcm_substream *substream)
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{
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return snd_pcm_lib_free_pages(substream);
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}
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static struct snd_dummy_pcm *new_pcm_stream(struct snd_pcm_substream *substream)
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{
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struct snd_dummy_pcm *dpcm;
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dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
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if (! dpcm)
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return dpcm;
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init_timer(&dpcm->timer);
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dpcm->timer.data = (unsigned long) dpcm;
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dpcm->timer.function = snd_card_dummy_pcm_timer_function;
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spin_lock_init(&dpcm->lock);
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dpcm->substream = substream;
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return dpcm;
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}
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static int snd_card_dummy_playback_open(struct snd_pcm_substream *substream)
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static int dummy_pcm_open(struct snd_pcm_substream *substream)
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{
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struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct snd_dummy_pcm *dpcm;
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int err;
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if ((dpcm = new_pcm_stream(substream)) == NULL)
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return -ENOMEM;
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runtime->private_data = dpcm;
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/* makes the infrastructure responsible for freeing dpcm */
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runtime->private_free = snd_card_dummy_runtime_free;
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runtime->hw = snd_card_dummy_playback;
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dummy->timer_ops = &dummy_systimer_ops;
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#ifdef CONFIG_HIGH_RES_TIMERS
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if (hrtimer)
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dummy->timer_ops = &dummy_hrtimer_ops;
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#endif
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err = dummy->timer_ops->create(substream);
|
||||
if (err < 0)
|
||||
return err;
|
||||
|
||||
runtime->hw = dummy_pcm_hardware;
|
||||
if (substream->pcm->device & 1) {
|
||||
runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
|
||||
runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
|
||||
}
|
||||
if (substream->pcm->device & 2)
|
||||
runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP|SNDRV_PCM_INFO_MMAP_VALID);
|
||||
err = add_playback_constraints(runtime);
|
||||
if (err < 0)
|
||||
runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP |
|
||||
SNDRV_PCM_INFO_MMAP_VALID);
|
||||
|
||||
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
|
||||
err = add_playback_constraints(substream->runtime);
|
||||
else
|
||||
err = add_capture_constraints(substream->runtime);
|
||||
if (err < 0) {
|
||||
dummy->timer_ops->free(substream);
|
||||
return err;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int snd_card_dummy_capture_open(struct snd_pcm_substream *substream)
|
||||
{
|
||||
struct snd_pcm_runtime *runtime = substream->runtime;
|
||||
struct snd_dummy_pcm *dpcm;
|
||||
int err;
|
||||
|
||||
if ((dpcm = new_pcm_stream(substream)) == NULL)
|
||||
return -ENOMEM;
|
||||
runtime->private_data = dpcm;
|
||||
/* makes the infrastructure responsible for freeing dpcm */
|
||||
runtime->private_free = snd_card_dummy_runtime_free;
|
||||
runtime->hw = snd_card_dummy_capture;
|
||||
if (substream->pcm->device == 1) {
|
||||
runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
|
||||
runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
|
||||
}
|
||||
if (substream->pcm->device & 2)
|
||||
runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP|SNDRV_PCM_INFO_MMAP_VALID);
|
||||
err = add_capture_constraints(runtime);
|
||||
if (err < 0)
|
||||
return err;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int snd_card_dummy_playback_close(struct snd_pcm_substream *substream)
|
||||
static int dummy_pcm_close(struct snd_pcm_substream *substream)
|
||||
{
|
||||
struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
|
||||
dummy->timer_ops->free(substream);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int snd_card_dummy_capture_close(struct snd_pcm_substream *substream)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct snd_pcm_ops snd_card_dummy_playback_ops = {
|
||||
.open = snd_card_dummy_playback_open,
|
||||
.close = snd_card_dummy_playback_close,
|
||||
.ioctl = snd_pcm_lib_ioctl,
|
||||
.hw_params = snd_card_dummy_hw_params,
|
||||
.hw_free = snd_card_dummy_hw_free,
|
||||
.prepare = snd_card_dummy_pcm_prepare,
|
||||
.trigger = snd_card_dummy_pcm_trigger,
|
||||
.pointer = snd_card_dummy_pcm_pointer,
|
||||
};
|
||||
|
||||
static struct snd_pcm_ops snd_card_dummy_capture_ops = {
|
||||
.open = snd_card_dummy_capture_open,
|
||||
.close = snd_card_dummy_capture_close,
|
||||
.ioctl = snd_pcm_lib_ioctl,
|
||||
.hw_params = snd_card_dummy_hw_params,
|
||||
.hw_free = snd_card_dummy_hw_free,
|
||||
.prepare = snd_card_dummy_pcm_prepare,
|
||||
.trigger = snd_card_dummy_pcm_trigger,
|
||||
.pointer = snd_card_dummy_pcm_pointer,
|
||||
static struct snd_pcm_ops dummy_pcm_ops = {
|
||||
.open = dummy_pcm_open,
|
||||
.close = dummy_pcm_close,
|
||||
.ioctl = snd_pcm_lib_ioctl,
|
||||
.hw_params = dummy_pcm_hw_params,
|
||||
.hw_free = dummy_pcm_hw_free,
|
||||
.prepare = dummy_pcm_prepare,
|
||||
.trigger = dummy_pcm_trigger,
|
||||
.pointer = dummy_pcm_pointer,
|
||||
};
|
||||
|
||||
static int __devinit snd_card_dummy_pcm(struct snd_dummy *dummy, int device,
|
||||
|
|
@ -440,8 +571,8 @@ static int __devinit snd_card_dummy_pcm(struct snd_dummy *dummy, int device,
|
|||
if (err < 0)
|
||||
return err;
|
||||
dummy->pcm = pcm;
|
||||
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_card_dummy_playback_ops);
|
||||
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_card_dummy_capture_ops);
|
||||
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &dummy_pcm_ops);
|
||||
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &dummy_pcm_ops);
|
||||
pcm->private_data = dummy;
|
||||
pcm->info_flags = 0;
|
||||
strcpy(pcm->name, "Dummy PCM");
|
||||
|
|
|
|||
Reference in New Issue