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Commit e74670b6 authored by Jaroslav Kysela's avatar Jaroslav Kysela
Browse files

ALSA: snd-aloop: add cable#0 and cable#1 files to proc card tree 



Show some useful runtime information using procfs.

Signed-off-by: default avatarJaroslav Kysela <perex@perex.cz>
parent 0db71023

sound/drivers/aloop.c

+84 −0
Original line number Diff line number Diff line
@@ -39,6 +39,7 @@ 
#include <sound/core.h>

#include <sound/control.h>

#include <sound/pcm.h>

#include <sound/info.h>

#include <sound/initval.h>



MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
@@ -184,6 +185,7 @@ static void loopback_timer_start(struct loopback_pcm *dpcm) 
static inline void loopback_timer_stop(struct loopback_pcm *dpcm)

{

	del_timer(&dpcm->timer);

	dpcm->timer.expires = 0;

}



#define CABLE_VALID_PLAYBACK	(1 << SNDRV_PCM_STREAM_PLAYBACK)
@@ -1011,6 +1013,86 @@ static int __devinit loopback_mixer_new(struct loopback *loopback, int notify) 
	return 0;

}



#ifdef CONFIG_PROC_FS



static void print_dpcm_info(struct snd_info_buffer *buffer,

			    struct loopback_pcm *dpcm,

			    const char *id)

{

	snd_iprintf(buffer, "  %s\n", id);

	if (dpcm == NULL) {

		snd_iprintf(buffer, "    inactive\n");

		return;

	}

	snd_iprintf(buffer, "    buffer_size:\t%u\n", dpcm->pcm_buffer_size);

	snd_iprintf(buffer, "    buffer_pos:\t\t%u\n", dpcm->buf_pos);

	snd_iprintf(buffer, "    silent_size:\t%u\n", dpcm->silent_size);

	snd_iprintf(buffer, "    period_size:\t%u\n", dpcm->pcm_period_size);

	snd_iprintf(buffer, "    bytes_per_sec:\t%u\n", dpcm->pcm_bps);

	snd_iprintf(buffer, "    sample_align:\t%u\n", dpcm->pcm_salign);

	snd_iprintf(buffer, "    rate_shift:\t\t%u\n", dpcm->pcm_rate_shift);

	snd_iprintf(buffer, "    update_pending:\t%u\n",

						dpcm->period_update_pending);

	snd_iprintf(buffer, "    irq_pos:\t\t%u\n", dpcm->irq_pos);

	snd_iprintf(buffer, "    period_frac:\t%u\n", dpcm->period_size_frac);

	snd_iprintf(buffer, "    last_jiffies:\t%lu (%lu)\n",

					dpcm->last_jiffies, jiffies);

	snd_iprintf(buffer, "    timer_expires:\t%lu\n", dpcm->timer.expires);

}



static void print_substream_info(struct snd_info_buffer *buffer,

				 struct loopback *loopback,

				 int sub,

				 int num)

{

	struct loopback_cable *cable = loopback->cables[sub][num];



	snd_iprintf(buffer, "Cable %i substream %i:\n", num, sub);

	if (cable == NULL) {

		snd_iprintf(buffer, "  inactive\n");

		return;

	}

	snd_iprintf(buffer, "  valid: %u\n", cable->valid);

	snd_iprintf(buffer, "  running: %u\n", cable->running);

	print_dpcm_info(buffer, cable->streams[0], "Playback");

	print_dpcm_info(buffer, cable->streams[1], "Capture");

}



static void print_cable_info(struct snd_info_entry *entry,

			     struct snd_info_buffer *buffer)

{

	struct loopback *loopback = entry->private_data;

	int sub, num;



	mutex_lock(&loopback->cable_lock);

	num = entry->name[strlen(entry->name)-1];

	num = num == '0' ? 0 : 1;

	for (sub = 0; sub < MAX_PCM_SUBSTREAMS; sub++)

		print_substream_info(buffer, loopback, sub, num);

	mutex_unlock(&loopback->cable_lock);

}



static int __devinit loopback_proc_new(struct loopback *loopback, int cidx)

{

	char name[32];

	struct snd_info_entry *entry;

	int err;



	snprintf(name, sizeof(name), "cable#%d", cidx);

	err = snd_card_proc_new(loopback->card, name, &entry);

	if (err < 0)

		return err;



	snd_info_set_text_ops(entry, loopback, print_cable_info);

	return 0;

}



#else /* !CONFIG_PROC_FS */



#define loopback_proc_new(loopback, cidx) do { } while (0)



#endif



static int __devinit loopback_probe(struct platform_device *devptr)

{

	struct snd_card *card;
@@ -1041,6 +1123,8 @@ static int __devinit loopback_probe(struct platform_device *devptr) 
	err = loopback_mixer_new(loopback, pcm_notify[dev] ? 1 : 0);

	if (err < 0)

		goto __nodev;

	loopback_proc_new(loopback, 0);

	loopback_proc_new(loopback, 1);

	strcpy(card->driver, "Loopback");

	strcpy(card->shortname, "Loopback");

	sprintf(card->longname, "Loopback %i", dev + 1);