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authorJaroslav Kysela <perex@suse.cz>2006-10-06 15:12:29 +0200
committerJaroslav Kysela <perex@suse.cz>2007-02-09 09:00:13 +0100
commitc7132aeb72ad1106dc76279de4d005f9e1c5815c (patch)
tree26fa47ea84824c136181a4be1184f43b07f7cb22 /sound
parent[ALSA] hda_intel: increase maximum DMA buffer size to 1024MB (diff)
downloadlinux-c7132aeb72ad1106dc76279de4d005f9e1c5815c.tar.xz
linux-c7132aeb72ad1106dc76279de4d005f9e1c5815c.zip
[ALSA] pcm core: add prealloc_max file to substream directory to show maximum DMA size
Users ask us many times about the maximum DMA size for PCM devices. This file gives them a hint in KB. Signed-off-by: Jaroslav Kysela <perex@suse.cz>
Diffstat (limited to 'sound')
-rw-r--r--sound/core/pcm_memory.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/sound/core/pcm_memory.c b/sound/core/pcm_memory.c
index be030cb4d373..95b1b2f0b1e2 100644
--- a/sound/core/pcm_memory.c
+++ b/sound/core/pcm_memory.c
@@ -101,6 +101,8 @@ int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream)
{
snd_pcm_lib_preallocate_dma_free(substream);
#ifdef CONFIG_SND_VERBOSE_PROCFS
+ snd_info_free_entry(substream->proc_prealloc_max_entry);
+ substream->proc_prealloc_max_entry = NULL;
snd_info_free_entry(substream->proc_prealloc_entry);
substream->proc_prealloc_entry = NULL;
#endif
@@ -142,6 +144,18 @@ static void snd_pcm_lib_preallocate_proc_read(struct snd_info_entry *entry,
}
/*
+ * read callback for prealloc_max proc file
+ *
+ * prints the maximum allowed size in kB.
+ */
+static void snd_pcm_lib_preallocate_max_proc_read(struct snd_info_entry *entry,
+ struct snd_info_buffer *buffer)
+{
+ struct snd_pcm_substream *substream = entry->private_data;
+ snd_iprintf(buffer, "%lu\n", (unsigned long) substream->dma_max / 1024);
+}
+
+/*
* write callback for prealloc proc file
*
* accepts the preallocation size in kB.
@@ -203,6 +217,15 @@ static inline void preallocate_info_init(struct snd_pcm_substream *substream)
}
}
substream->proc_prealloc_entry = entry;
+ if ((entry = snd_info_create_card_entry(substream->pcm->card, "prealloc_max", substream->proc_root)) != NULL) {
+ entry->c.text.read = snd_pcm_lib_preallocate_max_proc_read;
+ entry->private_data = substream;
+ if (snd_info_register(entry) < 0) {
+ snd_info_free_entry(entry);
+ entry = NULL;
+ }
+ }
+ substream->proc_prealloc_max_entry = entry;
}
#else /* !CONFIG_SND_VERBOSE_PROCFS */