[alsa-devel] [PATCH v2 2/2] ASoC: omap-mcpdm: Replace legacy driver

[Lars-Peter Clausen]

On 08/19/2011 10:38 AM, Lars-Peter Clausen wrote:
> On 08/19/2011 09:41 AM, Peter Ujfalusi wrote:
>> From: Misael Lopez Cruz <misael.lopez at ti.com>
>>
>> Reasons for the replacement:
>> The current driver for McPDM was developed to support the legacy mode only.
>> In preparation for the ABE support the current driver stack need the be
>> replaced.
>> The new driver is much simpler, easier to extend, and it also fixes some of the
>> issues with the old stack.
>>
>> Main changes:
>> - single file for omap-mcpdm (mcpdm.c/h removed)
>> - Define names for registers, bits cleaned up, prefixed
>> - Full-duplex audio operation (arecord | aplay) has been fixed
>> - Less code
>>
>> McPDM need to be turned off _after_ the codec's DAC/ADC has been powered down.
>> The solution for this without extensive change in core:
>> Use DAPM_SUPPLY to turn off the McPDM interface.
>> The machine driver connects the "OMAP McPDM Interface" to the codec's DAC/ADC,
>> so after audio activity we can be sure that the host side McPDM is turned off
>> at the correct time.
>>
>> Signed-off-by: Misael Lopez Cruz <misael.lopez at ti.com>
>> Signed-off-by: Liam Girdwood <lrg at ti.com>
>> Signed-off-by: Sebastien Guiriec <s-guiriec at ti.com>
>> Signed-off-by: Peter Ujfalusi <peter.ujfalusi at ti.com>
>> ---
>>  sound/soc/omap/Makefile     |    2 +-
>>  sound/soc/omap/mcpdm.c      |  472 -------------------------
>>  sound/soc/omap/mcpdm.h      |  152 --------
>>  sound/soc/omap/omap-mcpdm.c |  823 ++++++++++++++++++++++++++++---------------
>>  sound/soc/omap/omap-mcpdm.h |   97 +++++
>>  sound/soc/omap/sdp4430.c    |   14 +-
>>  6 files changed, 655 insertions(+), 905 deletions(-)
>>  delete mode 100644 sound/soc/omap/mcpdm.c
>>  delete mode 100644 sound/soc/omap/mcpdm.h
>>  rewrite sound/soc/omap/omap-mcpdm.c (46%)
>>  create mode 100644 sound/soc/omap/omap-mcpdm.h
>>
>> diff --git a/sound/soc/omap/Makefile b/sound/soc/omap/Makefile
>> index 59e2c8d..052fd75 100644
>> --- a/sound/soc/omap/Makefile
>> +++ b/sound/soc/omap/Makefile
>> @@ -1,7 +1,7 @@
>>  # OMAP Platform Support
>>  snd-soc-omap-objs := omap-pcm.o
>>  snd-soc-omap-mcbsp-objs := omap-mcbsp.o
>> -snd-soc-omap-mcpdm-objs := omap-mcpdm.o mcpdm.o
>> +snd-soc-omap-mcpdm-objs := omap-mcpdm.o
>>  snd-soc-omap-hdmi-objs := omap-hdmi.o
>>  
>>  obj-$(CONFIG_SND_OMAP_SOC) += snd-soc-omap.o
>> diff --git a/sound/soc/omap/mcpdm.c b/sound/soc/omap/mcpdm.c
>> deleted file mode 100644
>> index 9746a49..0000000
>> --- a/sound/soc/omap/mcpdm.c
>> +++ /dev/null
>> @@ -1,472 +0,0 @@
>> [...]
>> +static int omap_mcpdm_interface_event(struct snd_soc_dapm_widget *w,
>> +		struct snd_kcontrol *kcontrol, int event)
>> +{
>> +	struct omap_mcpdm *mcpdm = w->private_data;
> 
> Can't you use
> struct omap_mcpdm *mcpdm = snd_soc_codec_get_drvdata(codec)?

sorry:
struct omap_mcpdm *mcpdm =  snd_soc_platform_get_drvdata(w->platform);


> 
> This would avoid having to add the private_data field to the widget struct. In
> it's current form it will only really work, if there is just one instance of
> the driver using the widget. And if that's the case you can use a global
> variable directly anyway.
> 
> - Lars
> 
> 
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