ASoC: Move widgets from DAPM context to snd_soc_card

Decoupling widgets from DAPM context is required when extending the ASoC
core to cross-device paths. Even the list of widgets are now kept in
struct snd_soc_card, the widget listing in sysfs and debugs remain sorted
per device.

This patch makes possible to build cross-device paths but does not extend
yet the DAPM to handle codec bias and widget power changes of an another
device.

Cross-device paths are registered by listing the widgets from device A in
a map for device B. In case of conflicting widget names between the devices,
a uniform name prefix is needed to separate them. See commit ead9b91
"ASoC: Add optional name_prefix for kcontrol, widget and route names" for
help.

An example below shows a path that connects MONO out of A into Line In of B:

static const struct snd_soc_dapm_route mapA[] = {
	{"MONO", NULL, "DAC"},
};

static const struct snd_soc_dapm_route mapB[] = {
	{"Line In", NULL, "MONO"},
};

Signed-off-by: Jarkko Nikula <jhnikula@gmail.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/sound/soc/codecs/wm8960.c b/sound/soc/codecs/wm8960.c
index 2c5712dce1d5..054f5737319c 100644
--- a/sound/soc/codecs/wm8960.c
+++ b/sound/soc/codecs/wm8960.c
@@ -418,7 +418,9 @@ static int wm8960_add_widgets(struct snd_soc_codec *codec)
          * list each time to find the desired power state do so now
          * and save the result.
          */
-        list_for_each_entry(w, &codec->dapm.widgets, list) {
+        list_for_each_entry(w, &codec->card->widgets, list) {
+                if (w->dapm != &codec->dapm)
+                        continue;
                 if (strcmp(w->name, "LOUT1 PGA") == 0)
                         wm8960->lout1 = w;
                 if (strcmp(w->name, "ROUT1 PGA") == 0)