Commit c8bf93f0 authored by Peter Ujfalusi's avatar Peter Ujfalusi Committed by Mark Brown
Browse files

ASoC: Codec driver for Texas Instruments tlv320dac33 codec 



Driver for Texas Instruments TLV320DAC33 (SLAS546) low power stereo
audio DAC.

TLV320DAC33 is a stereo audio codec with integrated 24KB FIFO for low
power audio playback.

The digital interface can use I2S, DSP (A or B), Right and Left
justified formats.
DAC33 has stereo analog input, which can be bypassed to the analog
outputs.

Regarding to the internal 24KB FIFO the driver implements 'FIFO bypass'
mode (default) and nSample mode (FIFO is in use).
a) In 'FIFO bypass' mode the internal FIFO is not in use, the codec is
working synchronously as a normal codec (it needs constant stream of
data on the digital interface).

b) The nSample mode implementation uses one interrupt line from DAC33 to
the host:
Alarm threshold is set to 10ms of audio data (limit by the driver
implementation).
DAC33 will signal an interrupt, when the FIFO level goes under the
Alarm threshold.
The host will write to nSample register a value (number of stereo
samples), to tell DAC33 how many samples it should read in a burst from
the host. When the DAC33 received the number of samples, it disables the
clocks on the I2S bus. When the FIFO use again goes under the Alarm
threshold, DAC33 signals the host with an interrupt, and the process is
repeated.

Signed-off-by: default avatarPeter Ujfalusi <peter.ujfalusi@nokia.com>
Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent 640fb39e

include/sound/tlv320dac33-plat.h

0 → 100644
+20 −0
Original line number Diff line number Diff line 
/*

 * Platform header for Texas Instruments TLV320DAC33 codec driver

 *

 * Author:	Peter Ujfalusi <peter.ujfalusi@nokia.com>

 *

 * Copyright:   (C) 2009 Nokia Corporation

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 */



#ifndef __TLV320DAC33_PLAT_H

#define __TLV320DAC33_PLAT_H



struct tlv320dac33_platform_data {

	int power_gpio;

};



#endif /* __TLV320DAC33_PLAT_H */

sound/soc/codecs/Kconfig

+4 −0
Original line number Diff line number Diff line
@@ -30,6 +30,7 @@ config SND_SOC_ALL_CODECS 
	select SND_SOC_TLV320AIC26 if SPI_MASTER

	select SND_SOC_TLV320AIC3X if I2C

	select SND_SOC_TPA6130A2 if I2C

	select SND_SOC_TLV320DAC33 if I2C

	select SND_SOC_TWL4030 if TWL4030_CORE

	select SND_SOC_UDA134X

	select SND_SOC_UDA1380 if I2C
@@ -142,6 +143,9 @@ config SND_SOC_TLV320AIC26 
config SND_SOC_TLV320AIC3X

	tristate



config SND_SOC_TLV320DAC33

	tristate



config SND_SOC_TWL4030

	tristate

sound/soc/codecs/Makefile

+2 −0
Original line number Diff line number Diff line
@@ -17,6 +17,7 @@ snd-soc-stac9766-objs := stac9766.o 
snd-soc-tlv320aic23-objs := tlv320aic23.o

snd-soc-tlv320aic26-objs := tlv320aic26.o

snd-soc-tlv320aic3x-objs := tlv320aic3x.o

snd-soc-tlv320dac33-objs := tlv320dac33.o

snd-soc-twl4030-objs := twl4030.o

snd-soc-uda134x-objs := uda134x.o

snd-soc-uda1380-objs := uda1380.o
@@ -70,6 +71,7 @@ obj-$(CONFIG_SND_SOC_STAC9766) += snd-soc-stac9766.o 
obj-$(CONFIG_SND_SOC_TLV320AIC23)	+= snd-soc-tlv320aic23.o

obj-$(CONFIG_SND_SOC_TLV320AIC26)	+= snd-soc-tlv320aic26.o

obj-$(CONFIG_SND_SOC_TLV320AIC3X)	+= snd-soc-tlv320aic3x.o

obj-$(CONFIG_SND_SOC_TLV320DAC33)	+= snd-soc-tlv320dac33.o

obj-$(CONFIG_SND_SOC_TWL4030)	+= snd-soc-twl4030.o

obj-$(CONFIG_SND_SOC_UDA134X)	+= snd-soc-uda134x.o

obj-$(CONFIG_SND_SOC_UDA1380)	+= snd-soc-uda1380.o

CRA Git | Maintained and supported by SUSTech CRA and CCSE