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>

diff --git a/sound/drivers/dummy.c b/sound/drivers/dummy.c
index 2ee6c8e..ccfbdfa 100644 (file)
--- a/sound/drivers/dummy.c
+++ b/sound/drivers/dummy.c
@@ -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);