[alsa-devel] Jack insertion

naveen krishna ch naveenkrishna.ch at gmail.com
Tue Nov 18 14:48:56 CET 2008

On Tue, Nov 18, 2008 at 7:07 PM, naveen krishna ch <
naveenkrishna.ch at gmail.com> wrote:

> On Tue, Nov 18, 2008 at 4:33 PM, Mark Brown <broonie at sirena.org.uk> wrote:
>> On Tue, Nov 18, 2008 at 12:16:18PM +0530, naveen krishna ch wrote:
>> > Now my issue is is there any work regarding the Headset JACK
>> > insertion/detection.
>> > Earlier there was a proposal for a jack insertion layer.
>> > Can anyone suggest me in this regard.
>> The generic ALSA part of the API has been merged already - see
>> include/sound/jack.h.
But, i see the jack layer uses the structure

struct snd_device {
        struct list_head list;          /* list of registered devices */
        struct snd_card *card;          /* card which holds this device */
        snd_device_state_t state;       /* state of the device */
        snd_device_type_t type;         /* device type */
        void *device_data;              /* device structure */
        struct snd_device_ops *ops;     /* operations */

The latest ALSA SOC drivers ( In my case my driver ) uses

struct snd_soc_device {
        struct device *dev;
        struct snd_soc_machine *machine;
        struct snd_soc_platform *platform;
        struct snd_soc_codec *codec;
        struct snd_soc_codec_device *codec_dev;
        struct delayed_work delayed_work;
        struct work_struct deferred_resume_work;
         void *codec_data;

in this case what shall i do to make use of the jack abstraction layer.
If cant use the jack abstraction layer, can any one suggest me the other way

>> For ASoC drivers you need to implement the actual detection in your
>> machine driver.  Normally this would just hook into a GPIO.  You can
>> then update the DAPM widget for the jack to mark it as in use or not in
>> use (some existing drivers do this) and also hook into the generic
>> userspace API (that's not been implemented by anyone yet).  Plan is to
>> get something more generic into 2.6.30.
> Thanks for  your early reply. I am a new to this SOC i started developing
> the driver taking the  Gumsitcs OVERO  + TWL4030 ASOC codec driver as
> reference.
> In my case the Headset detect gpio is not from the machine (OMAP3) but from
> the CODEC(TWL4030) itself. Is there any previous case liek this
> --
> Thanks,
> (: Naveen Krishna Ch :)


(: Naveen Krishna Ch :)

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