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

Show some useful runtime information using procfs.

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Jaroslav Kysela 2010-10-18 09:43:10 +02:00
parent 0db7102305
commit e74670b6fd
1 changed files with 84 additions and 0 deletions
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84
sound/drivers/aloop.c
View File

@ -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);