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Commit 1d001ceb authored by Meng Wang's avatar Meng Wang Committed by Meng Wang
Browse files

ALSA: core: Handle user defined ioctls 



Handle ioctl magic 'U' as a user defined ioctl so that ALSA core calls
substream's ioctl handler.  This gets rid of a requirement that ALSA core
needs to be changed every time when a new user defined ioctl is introduced.

Change-Id: I390b9e0428bfadc302ff074417aa69163b12c6ec
Signed-off-by: default avatarJoonwoo Park <joonwoop@codeaurora.org>
Signed-off-by: default avatarBanajit Goswami <bgoswami@codeaurora.org>
Signed-off-by: default avatarSudheer Papothi <spapothi@codeaurora.org>
Signed-off-by: default avatarMeng Wang <mwang@codeaurora.org>
parent a70116e1

sound/core/pcm_native.c

+27 −2
Original line number Diff line number Diff line
@@ -1260,6 +1260,21 @@ static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream) 
				       SNDRV_PCM_STATE_RUNNING);

}



#ifdef CONFIG_AUDIO_QGKI

static int snd_user_ioctl(struct snd_pcm_substream *substream,

				unsigned int cmd, void __user *arg)

{

	struct snd_pcm_runtime *runtime;

	int err = 0;



	if (PCM_RUNTIME_CHECK(substream))

		return -ENXIO;

	runtime = substream->runtime;

	err = substream->ops->ioctl(substream, cmd, arg);

	return err;

}

#endif



/*

 * stop callbacks

 */
@@ -2974,6 +2989,11 @@ static int snd_pcm_common_ioctl(struct file *file, 
		return snd_pcm_rewind_ioctl(substream, arg);

	case SNDRV_PCM_IOCTL_FORWARD:

		return snd_pcm_forward_ioctl(substream, arg);

#ifdef CONFIG_AUDIO_QGKI

	default:

		if (((cmd >> 8) & 0xff) == 'U')

			return snd_user_ioctl(substream, cmd, arg);

#endif

	}

	pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd);

	return -ENOTTY;
@@ -2983,10 +3003,15 @@ static long snd_pcm_ioctl(struct file *file, unsigned int cmd, 
			  unsigned long arg)

{

	struct snd_pcm_file *pcm_file;

	unsigned char ioctl_magic;



	pcm_file = file->private_data;



	if (((cmd >> 8) & 0xff) != 'A')

	ioctl_magic = ((cmd >> 8) & 0xff);

#ifdef CONFIG_AUDIO_QGKI

	if (ioctl_magic != 'A' && ioctl_magic != 'U')

#else

	if (ioctl_magic != 'A')

#endif

		return -ENOTTY;



	return snd_pcm_common_ioctl(file, pcm_file->substream, cmd,