C++ (Cpp) copy_from_user_toio Examples

Example #1

/* copy callback for halfduplex mode */
static int snd_rme32_playback_copy(struct snd_pcm_substream *substream, int channel,	/* not used (interleaved data) */
				   snd_pcm_uframes_t pos,
				   void __user *src, snd_pcm_uframes_t count)
{
	struct rme32 *rme32 = snd_pcm_substream_chip(substream);
	count <<= rme32->playback_frlog;
	pos <<= rme32->playback_frlog;
	if (copy_from_user_toio(rme32->iobase + RME32_IO_DATA_BUFFER + pos,
			    src, count))
		return -EFAULT;
	return 0;
}

Example #2

File: nm256.c Project: 3sOx/asuswrt-merlin

static int
snd_nm256_playback_copy(struct snd_pcm_substream *substream,
			int channel, /* not used (interleaved data) */
			snd_pcm_uframes_t pos,
			void __user *src,
			snd_pcm_uframes_t count)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct nm256_stream *s = runtime->private_data;
	count = frames_to_bytes(runtime, count);
	pos = frames_to_bytes(runtime, pos);
	if (copy_from_user_toio(s->bufptr + pos, src, count))
		return -EFAULT;
	return 0;
}