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>

1 files changed, 132 insertions, 0 deletions

diff --git a/sound/drivers/dummy.c b/sound/drivers/dummy.c
index 2ee6c8ebe25a..ccfbdfa75511 100644
--- 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);