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ALSA: dummy - Add debug proc file

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Added the debug proc file to see or change the snd_pcm_hardware fields
to emulate.  The parameters can be changed by writing to a proc file like:

    # echo periods_min 4 > /proc/asound/card1/dummy_pcm

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2009-09-08 14:30:49 +02:00
parent 4f7454a997
commit 9b151fec13
1 changed files with 132 additions and 0 deletions
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132
sound/drivers/dummy.c
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@ -33,6 +33,7 @@
#include <sound/tlv.h>
#include <sound/pcm.h>
#include <sound/rawmidi.h>
#include <sound/info.h>
#include <sound/initval.h>
MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
@ -686,6 +687,10 @@ static int __devinit snd_card_dummy_pcm(struct snd_dummy *dummy, int device,
return 0;
}
/*
* mixer interface
*/
#define DUMMY_VOLUME(xname, xindex, addr) \
{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
.access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ, \
@ -816,6 +821,131 @@ static int __devinit snd_card_dummy_new_mixer(struct snd_dummy *dummy)
return 0;
}
#if defined(CONFIG_SND_DEBUG) && defined(CONFIG_PROC_FS)
/*
* proc interface
*/
static void print_formats(struct snd_info_buffer *buffer)
{
int i;
for (i = 0; i < SNDRV_PCM_FORMAT_LAST; i++) {
if (dummy_pcm_hardware.formats & (1ULL << i))
snd_iprintf(buffer, " %s", snd_pcm_format_name(i));
}
}
static void print_rates(struct snd_info_buffer *buffer)
{
static int rates[] = {
5512, 8000, 11025, 16000, 22050, 32000, 44100, 48000,
64000, 88200, 96000, 176400, 192000,
};
int i;
if (dummy_pcm_hardware.rates & SNDRV_PCM_RATE_CONTINUOUS)
snd_iprintf(buffer, " continuous");
if (dummy_pcm_hardware.rates & SNDRV_PCM_RATE_KNOT)
snd_iprintf(buffer, " knot");
for (i = 0; i < ARRAY_SIZE(rates); i++)
if (dummy_pcm_hardware.rates & (1 << i))
snd_iprintf(buffer, " %d", rates[i]);
}
#define get_dummy_int_ptr(ofs) \
(unsigned int *)((char *)&dummy_pcm_hardware + (ofs))
#define get_dummy_ll_ptr(ofs) \
(unsigned long long *)((char *)&dummy_pcm_hardware + (ofs))
struct dummy_hw_field {
const char *name;
const char *format;
unsigned int offset;
unsigned int size;
};
#define FIELD_ENTRY(item, fmt) { \
.name = #item, \
.format = fmt, \
.offset = offsetof(struct snd_pcm_hardware, item), \
.size = sizeof(dummy_pcm_hardware.item) }
static struct dummy_hw_field fields[] = {
FIELD_ENTRY(formats, "%#llx"),
FIELD_ENTRY(rates, "%#x"),
FIELD_ENTRY(rate_min, "%d"),
FIELD_ENTRY(rate_max, "%d"),
FIELD_ENTRY(channels_min, "%d"),
FIELD_ENTRY(channels_max, "%d"),
FIELD_ENTRY(buffer_bytes_max, "%ld"),
FIELD_ENTRY(period_bytes_min, "%ld"),
FIELD_ENTRY(period_bytes_max, "%ld"),
FIELD_ENTRY(periods_min, "%d"),
FIELD_ENTRY(periods_max, "%d"),
};
static void dummy_proc_read(struct snd_info_entry *entry,
struct snd_info_buffer *buffer)
{
int i;
for (i = 0; i < ARRAY_SIZE(fields); i++) {
snd_iprintf(buffer, "%s ", fields[i].name);
if (fields[i].size == sizeof(int))
snd_iprintf(buffer, fields[i].format,
*get_dummy_int_ptr(fields[i].offset));
else
snd_iprintf(buffer, fields[i].format,
*get_dummy_ll_ptr(fields[i].offset));
if (!strcmp(fields[i].name, "formats"))
print_formats(buffer);
else if (!strcmp(fields[i].name, "rates"))
print_rates(buffer);
snd_iprintf(buffer, "\n");
}
}
static void dummy_proc_write(struct snd_info_entry *entry,
struct snd_info_buffer *buffer)
{
char line[64];
while (!snd_info_get_line(buffer, line, sizeof(line))) {
char item[20];
const char *ptr;
unsigned long long val;
int i;
ptr = snd_info_get_str(item, line, sizeof(item));
for (i = 0; i < ARRAY_SIZE(fields); i++) {
if (!strcmp(item, fields[i].name))
break;
}
if (i >= ARRAY_SIZE(fields))
continue;
snd_info_get_str(item, ptr, sizeof(item));
if (strict_strtoull(item, 0, &val))
continue;
if (fields[i].size == sizeof(int))
*get_dummy_int_ptr(fields[i].offset) = val;
else
*get_dummy_ll_ptr(fields[i].offset) = val;
}
}
static void __devinit dummy_proc_init(struct snd_dummy *chip)
{
struct snd_info_entry *entry;
if (!snd_card_proc_new(chip->card, "dummy_pcm", &entry)) {
snd_info_set_text_ops(entry, chip, dummy_proc_read);
entry->c.text.write = dummy_proc_write;
entry->mode |= S_IWUSR;
}
}
#else
#define dummy_proc_init(x)
#endif /* CONFIG_SND_DEBUG && CONFIG_PROC_FS */
static int __devinit snd_dummy_probe(struct platform_device *devptr)
{
struct snd_card *card;
@ -845,6 +975,8 @@ static int __devinit snd_dummy_probe(struct platform_device *devptr)
strcpy(card->shortname, "Dummy");
sprintf(card->longname, "Dummy %i", dev + 1);
dummy_proc_init(dummy);
snd_card_set_dev(card, &devptr->dev);
err = snd_card_register(card);