ALSA: dummy - Add debug proc file
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>
hifive-unleashed-5.1
Takashi Iwai
parent
4f7454a997
commit
9b151fec13
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@ -33,6 +33,7 @@
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#include <sound/tlv.h>
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#include <sound/pcm.h>
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#include <sound/rawmidi.h>
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#include <sound/info.h>
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#include <sound/initval.h>
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MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
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@ -686,6 +687,10 @@ static int __devinit snd_card_dummy_pcm(struct snd_dummy *dummy, int device,
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return 0;
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}
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/*
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* mixer interface
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*/
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#define DUMMY_VOLUME(xname, xindex, addr) \
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{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
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.access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ, \
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@ -816,6 +821,131 @@ static int __devinit snd_card_dummy_new_mixer(struct snd_dummy *dummy)
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return 0;
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}
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#if defined(CONFIG_SND_DEBUG) && defined(CONFIG_PROC_FS)
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/*
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* proc interface
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*/
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static void print_formats(struct snd_info_buffer *buffer)
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{
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int i;
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for (i = 0; i < SNDRV_PCM_FORMAT_LAST; i++) {
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if (dummy_pcm_hardware.formats & (1ULL << i))
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snd_iprintf(buffer, " %s", snd_pcm_format_name(i));
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}
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}
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static void print_rates(struct snd_info_buffer *buffer)
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{
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static int rates[] = {
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5512, 8000, 11025, 16000, 22050, 32000, 44100, 48000,
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64000, 88200, 96000, 176400, 192000,
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};
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int i;
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if (dummy_pcm_hardware.rates & SNDRV_PCM_RATE_CONTINUOUS)
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snd_iprintf(buffer, " continuous");
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if (dummy_pcm_hardware.rates & SNDRV_PCM_RATE_KNOT)
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snd_iprintf(buffer, " knot");
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for (i = 0; i < ARRAY_SIZE(rates); i++)
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if (dummy_pcm_hardware.rates & (1 << i))
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snd_iprintf(buffer, " %d", rates[i]);
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}
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#define get_dummy_int_ptr(ofs) \
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(unsigned int *)((char *)&dummy_pcm_hardware + (ofs))
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#define get_dummy_ll_ptr(ofs) \
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(unsigned long long *)((char *)&dummy_pcm_hardware + (ofs))
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struct dummy_hw_field {
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const char *name;
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const char *format;
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unsigned int offset;
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unsigned int size;
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};
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#define FIELD_ENTRY(item, fmt) { \
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.name = #item, \
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.format = fmt, \
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.offset = offsetof(struct snd_pcm_hardware, item), \
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.size = sizeof(dummy_pcm_hardware.item) }
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static struct dummy_hw_field fields[] = {
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FIELD_ENTRY(formats, "%#llx"),
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FIELD_ENTRY(rates, "%#x"),
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FIELD_ENTRY(rate_min, "%d"),
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FIELD_ENTRY(rate_max, "%d"),
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FIELD_ENTRY(channels_min, "%d"),
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FIELD_ENTRY(channels_max, "%d"),
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FIELD_ENTRY(buffer_bytes_max, "%ld"),
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FIELD_ENTRY(period_bytes_min, "%ld"),
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FIELD_ENTRY(period_bytes_max, "%ld"),
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FIELD_ENTRY(periods_min, "%d"),
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FIELD_ENTRY(periods_max, "%d"),
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};
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static void dummy_proc_read(struct snd_info_entry *entry,
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struct snd_info_buffer *buffer)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(fields); i++) {
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snd_iprintf(buffer, "%s ", fields[i].name);
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if (fields[i].size == sizeof(int))
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snd_iprintf(buffer, fields[i].format,
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*get_dummy_int_ptr(fields[i].offset));
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else
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snd_iprintf(buffer, fields[i].format,
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*get_dummy_ll_ptr(fields[i].offset));
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if (!strcmp(fields[i].name, "formats"))
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print_formats(buffer);
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else if (!strcmp(fields[i].name, "rates"))
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print_rates(buffer);
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snd_iprintf(buffer, "\n");
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}
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}
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static void dummy_proc_write(struct snd_info_entry *entry,
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struct snd_info_buffer *buffer)
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{
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char line[64];
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while (!snd_info_get_line(buffer, line, sizeof(line))) {
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char item[20];
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const char *ptr;
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unsigned long long val;
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int i;
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ptr = snd_info_get_str(item, line, sizeof(item));
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for (i = 0; i < ARRAY_SIZE(fields); i++) {
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if (!strcmp(item, fields[i].name))
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break;
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}
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if (i >= ARRAY_SIZE(fields))
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continue;
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snd_info_get_str(item, ptr, sizeof(item));
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if (strict_strtoull(item, 0, &val))
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continue;
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if (fields[i].size == sizeof(int))
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*get_dummy_int_ptr(fields[i].offset) = val;
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else
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*get_dummy_ll_ptr(fields[i].offset) = val;
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}
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}
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static void __devinit dummy_proc_init(struct snd_dummy *chip)
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{
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struct snd_info_entry *entry;
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if (!snd_card_proc_new(chip->card, "dummy_pcm", &entry)) {
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snd_info_set_text_ops(entry, chip, dummy_proc_read);
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entry->c.text.write = dummy_proc_write;
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entry->mode |= S_IWUSR;
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}
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}
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#else
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#define dummy_proc_init(x)
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#endif /* CONFIG_SND_DEBUG && CONFIG_PROC_FS */
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static int __devinit snd_dummy_probe(struct platform_device *devptr)
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{
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struct snd_card *card;
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@ -845,6 +975,8 @@ static int __devinit snd_dummy_probe(struct platform_device *devptr)
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strcpy(card->shortname, "Dummy");
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sprintf(card->longname, "Dummy %i", dev + 1);
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dummy_proc_init(dummy);
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snd_card_set_dev(card, &devptr->dev);
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err = snd_card_register(card);
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