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authorTakashi Iwai <tiwai@suse.de>2017-06-19 23:11:54 +0200
committerTakashi Iwai <tiwai@suse.de>2017-06-27 13:55:46 +0200
commit4b671f57747468d7c810caaf955f79ff1aece4d4 (patch)
tree21823a35b9aa3367ae2860b0674425ee07a40ed6 /include/sound
parent532a7784c376f2332d38c4c1576843c66343713d (diff)
ALSA: pcm: Add an ioctl to specify the supported protocol version
We have an ioctl to inform the PCM protocol version the running kernel supports, but there is no way to know which protocol version the user-space can understand. This lack of information caused headaches in the past when we tried to extend the ABI. For example, because we couldn't guarantee the validity of the reserved bytes, we had to introduce a new ioctl SNDRV_PCM_IOCTL_STATUS_EXT for assigning a few new fields in the formerly reserved bits. If we could know that it's a new alsa-lib, we could assume the availability of the new fields, thus we could have reused the existing SNDRV_PCM_IOCTL_STATUS. In order to improve the ABI extensibility, this patch adds a new ioctl for user-space to inform its supporting protocol version to the kernel. By reporting the supported protocol from user-space, the kernel can judge which feature should be provided and which not. With the addition of the new ioctl, the PCM protocol version is bumped to 2.0.14, too. User-space checks the kernel protocol version via SNDRV_PCM_INFO_PVERSION, then it sets the supported version back via SNDRV_PCM_INFO_USER_PVERSION. Reviewed-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'include/sound')
-rw-r--r--include/sound/pcm.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/sound/pcm.h b/include/sound/pcm.h
index 5a22075c5fcf..24febf9e177c 100644
--- a/include/sound/pcm.h
+++ b/include/sound/pcm.h
@@ -218,6 +218,7 @@ struct snd_pcm_ops {
struct snd_pcm_file {
struct snd_pcm_substream *substream;
int no_compat_mmap;
+ unsigned int user_pversion; /* supported protocol version */
};
struct snd_pcm_hw_rule;