20bit PCM in 32 bit container

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Hi ,

 My hardware uses a 20bit PCM format packed in 32bit, ,  I am using a
2.6.12 kernel and such a format doesn't exist, is the following enough
for defining this format:

 1) defning a new value in 'enum sndrv_pcm_format'
 2) adding new entry to pcm_formats[SNDRV_PCM_FORMAT_LAST+1] array
that describes the new format .

	[SNDRV_PCM_FORMAT_S20_NEW_LE] = {
		.width = 20, .phys = 32, .le = 1, .signd = 1,
		.silence = {},
	},


Thanks in advance

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