ASoC: simple-card-utils: add asoc_simple_parse_pin_switches()

This function is a helper that permits to create pin switch controls for
a list of widgets whose names are listed in the PREFIX "pin-switches"
devicetree property.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/include/sound/simple_card_utils.h b/include/sound/simple_card_utils.h
index 67dc3ee6ed0112fe126edfa73ea75d611e5a01d7..3429888347e7c21110182b4b2f4dd3e7c3e32a42 100644 (file)
--- a/include/sound/simple_card_utils.h
+++ b/include/sound/simple_card_utils.h
@@ -133,6 +133,8 @@ int asoc_simple_parse_routing(struct snd_soc_card *card,
                                      char *prefix);
 int asoc_simple_parse_widgets(struct snd_soc_card *card,
                                      char *prefix);
+int asoc_simple_parse_pin_switches(struct snd_soc_card *card,
+                                  char *prefix);
 
 int asoc_simple_init_jack(struct snd_soc_card *card,
                               struct asoc_simple_jack *sjack,

diff --git a/sound/soc/generic/simple-card-utils.c b/sound/soc/generic/simple-card-utils.c
index db1458a19985f8cc6dfdf47030fed2313e8cb24a..f4c6375d11c7a56bc7866d6be4b9d82ed9625644 100644 (file)
--- a/sound/soc/generic/simple-card-utils.c
+++ b/sound/soc/generic/simple-card-utils.c
@@ -430,6 +430,63 @@ int asoc_simple_parse_widgets(struct snd_soc_card *card,
 }
 EXPORT_SYMBOL_GPL(asoc_simple_parse_widgets);
 
+int asoc_simple_parse_pin_switches(struct snd_soc_card *card,
+                                  char *prefix)
+{
+       const unsigned int nb_controls_max = 16;
+       const char **strings, *control_name;
+       struct snd_kcontrol_new *controls;
+       struct device *dev = card->dev;
+       unsigned int i, nb_controls;
+       char prop[128];
+       int ret;
+
+       if (!prefix)
+               prefix = "";
+
+       snprintf(prop, sizeof(prop), "%s%s", prefix, "pin-switches");
+
+       if (!of_property_read_bool(dev->of_node, prop))
+               return 0;
+
+       strings = devm_kcalloc(dev, nb_controls_max,
+                              sizeof(*strings), GFP_KERNEL);
+       if (!strings)
+               return -ENOMEM;
+
+       ret = of_property_read_string_array(dev->of_node, prop,
+                                           strings, nb_controls_max);
+       if (ret < 0)
+               return ret;
+
+       nb_controls = (unsigned int)ret;
+
+       controls = devm_kcalloc(dev, nb_controls,
+                               sizeof(*controls), GFP_KERNEL);
+       if (!controls)
+               return -ENOMEM;
+
+       for (i = 0; i < nb_controls; i++) {
+               control_name = devm_kasprintf(dev, GFP_KERNEL,
+                                             "%s Switch", strings[i]);
+               if (!control_name)
+                       return -ENOMEM;
+
+               controls[i].iface = SNDRV_CTL_ELEM_IFACE_MIXER;
+               controls[i].name = control_name;
+               controls[i].info = snd_soc_dapm_info_pin_switch;
+               controls[i].get = snd_soc_dapm_get_pin_switch;
+               controls[i].put = snd_soc_dapm_put_pin_switch;
+               controls[i].private_value = (unsigned long)strings[i];
+       }
+
+       card->controls = controls;
+       card->num_controls = nb_controls;
+
+       return 0;
+}
+EXPORT_SYMBOL_GPL(asoc_simple_parse_pin_switches);
+
 int asoc_simple_init_jack(struct snd_soc_card *card,
                          struct asoc_simple_jack *sjack,
                          int is_hp, char *prefix)