ALSA: HDA: Create phantom jacks for fixed inputs and outputs

PulseAudio sometimes have difficulties knowing that there is a
"Speaker" or "Internal Mic", if they have no individual volume
controls or selectors. As a result, only e g "Headphone" might
be created for a laptop, but no "Speaker".
To help out, create phantom jacks (that are always present,
at least for now) for "Speaker", "Internal Mic" etc, in case we
detect them.
The naming convention is e g "Speaker Phantom Jack".

In order not to pollute the /dev/input namespace with even more
devices, these are added to the kcontrols only, not the input devices.

Signed-off-by: David Henningsson <david.henningsson@canonical.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/hda_jack.h

@@ -23,6 +23,7 @@ struct hda_jack_tbl {
 	unsigned int pin_sense;		/* cached pin-sense value */
 	unsigned int jack_detect:1;	/* capable of jack-detection? */
 	unsigned int jack_dirty:1;	/* needs to update? */
+	unsigned int phantom_jack:1;    /* a fixed, always present port? */
 	struct snd_kcontrol *kctl;	/* assigned kctl for jack-detection */
 #ifdef CONFIG_SND_HDA_INPUT_JACK
 	int type;