ALSA: hda - A new flag to enforce prefix to each pin

This is a preliminary patch for a smooth multi-codec support, and it
introduces a new flag, force_pin_prefix, to struct hda_codec.
This flag is used to force to add the pin location prefix to each
input pin.  For example, when there is only one microphone pin,
usually the auto-parser assigns the string "Mic".  With this flag on,
it'll be like "Front Mic".  Also, the creation of "Master" or "PCM"
playback volume for a single pin is suppressed, too.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=195305
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/hda_auto_parser.c

@@ -580,6 +580,7 @@ const char *hda_get_autocfg_input_label(struct hda_codec *codec,
 		has_multiple_pins = 1;
 	if (has_multiple_pins && type == AUTO_PIN_MIC)
 		has_multiple_pins &= check_mic_location_need(codec, cfg, input);
+	has_multiple_pins |= codec->force_pin_prefix;
 	return hda_get_input_pin_label(codec, &cfg->inputs[input],
 				       cfg->inputs[input].pin,
 				       has_multiple_pins);

sound/pci/hda/hda_codec.h

@@ -256,6 +256,7 @@ struct hda_codec {
 	unsigned int dump_coef:1; /* dump processing coefs in codec proc file */
 	unsigned int power_save_node:1; /* advanced PM for each widget */
 	unsigned int auto_runtime_pm:1; /* enable automatic codec runtime pm */
+	unsigned int force_pin_prefix:1; /* Add location prefix */
 #ifdef CONFIG_PM
 	unsigned long power_on_acct;
 	unsigned long power_off_acct;

sound/pci/hda/hda_generic.c

@@ -1125,6 +1125,7 @@ static const char *get_line_out_pfx(struct hda_codec *codec, int ch,
 
 	*index = 0;
 	if (cfg->line_outs == 1 && !spec->multi_ios &&
+	    !codec->force_pin_prefix &&
 	    !cfg->hp_outs && !cfg->speaker_outs)
 		return spec->vmaster_mute.hook ? "PCM" : "Master";
 
@@ -1132,6 +1133,7 @@ static const char *get_line_out_pfx(struct hda_codec *codec, int ch,
 	 * use it master (or "PCM" if a vmaster hook is present)
 	 */
 	if (spec->multiout.num_dacs == 1 && !spec->mixer_nid &&
+	    !codec->force_pin_prefix &&
 	    !spec->multiout.hp_out_nid[0] && !spec->multiout.extra_out_nid[0])
 		return spec->vmaster_mute.hook ? "PCM" : "Master";