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| author | Jaroslav Kysela <perex@suse.cz> | 2006-10-06 15:12:29 +0200 |
|---|---|---|
| committer | Jaroslav Kysela <perex@suse.cz> | 2007-02-09 09:00:13 +0100 |
| commit | c7132aeb72ad1106dc76279de4d005f9e1c5815c (patch) | |
| tree | 26fa47ea84824c136181a4be1184f43b07f7cb22 /sound/core | |
| parent | b66b3cfe6c2f6560f351278883a325b6ebc478f5 (diff) | |
| download | linux-c7132aeb72ad1106dc76279de4d005f9e1c5815c.tar.bz2 | |
[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/core')
| -rw-r--r-- | sound/core/pcm_memory.c | 23 |
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 */ |