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459 giacomo 1 
#ifndef __INCLUDED_TDA9840__
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#define __INCLUDED_TDA9840__
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#define I2C_TDA9840             0x42
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#define TDA9840_DETECT          _IOR('v',1,int)
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/* return values for TDA9840_DETCT */
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#define TDA9840_MONO_DETECT             0x0
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#define TDA9840_DUAL_DETECT             0x1
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#define TDA9840_STEREO_DETECT           0x2
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#define TDA9840_INCORRECT_DETECT        0x3
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#define TDA9840_SWITCH          _IOW('v',2,int)
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/* modes than can be set with TDA9840_SWITCH */
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#define TDA9840_SET_MUTE                0x00
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#define TDA9840_SET_MONO                0x10
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#define TDA9840_SET_STEREO              0x2a
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#define TDA9840_SET_LANG1               0x12
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#define TDA9840_SET_LANG2               0x1e
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#define TDA9840_SET_BOTH                0x1a
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#define TDA9840_SET_BOTH_R              0x16
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#define TDA9840_SET_EXTERNAL            0x7a
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/* values may range between +2.5 and -2.0;
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   the value has to be multiplied with 10 */
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#define TDA9840_LEVEL_ADJUST    _IOW('v',3,int)
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/* values may range between +2.5 and -2.4;
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   the value has to be multiplied with 10 */
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#define TDA9840_STEREO_ADJUST   _IOW('v',4,int)
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/* currently not implemented */
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#define TDA9840_TEST            _IOW('v',5,int)
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#endif