ASoC: add snd_soc_of_parse_audio_simple_widgets for DT

This patch adds snd_soc_of_parse_audio_simple_widgets() and supports
below style of widgets name on DT:

	"template-wname", "user supplied wname"

For instance:
	simple-audio-widgets =
		"Microphone", "Microphone Jack",
		"Line", "Line In Jack",
		"Line", "Line Out Jack",
		"Headphone", "Headphone Jack",
		"Speaker", "Speaker External";

The "template-wname" currently includes: "Microphone", "Line", "Headphone"
and "Speaker".

Signed-off-by: Xiubo Li <Li.Xiubo@freescale.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
(cherry picked from commit 9a6d48605e632e84db2895cf752c65b3c908cd09)
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

diff --git a/include/sound/soc.h b/include/sound/soc.h
index 9a00147..465dc6e 100644 (file)
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -1173,6 +1173,8 @@ void snd_soc_util_exit(void);
 
 int snd_soc_of_parse_card_name(struct snd_soc_card *card,
                               const char *propname);
+int snd_soc_of_parse_audio_simple_widgets(struct snd_soc_card *card,
+                                         const char *propname);
 int snd_soc_of_parse_audio_routing(struct snd_soc_card *card,
                                   const char *propname);
 unsigned int snd_soc_of_parse_daifmt(struct device_node *np,

diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index fe1df50..0540cb0 100644 (file)
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -4417,6 +4417,93 @@ int snd_soc_of_parse_card_name(struct snd_soc_card *card,
 }
 EXPORT_SYMBOL_GPL(snd_soc_of_parse_card_name);
 
+static const struct snd_soc_dapm_widget simple_widgets[] = {
+       SND_SOC_DAPM_MIC("Microphone", NULL),
+       SND_SOC_DAPM_LINE("Line", NULL),
+       SND_SOC_DAPM_HP("Headphone", NULL),
+       SND_SOC_DAPM_SPK("Speaker", NULL),
+};
+
+int snd_soc_of_parse_audio_simple_widgets(struct snd_soc_card *card,
+                                         const char *propname)
+{
+       struct device_node *np = card->dev->of_node;
+       struct snd_soc_dapm_widget *widgets;
+       const char *template, *wname;
+       int i, j, num_widgets, ret;
+
+       num_widgets = of_property_count_strings(np, propname);
+       if (num_widgets < 0) {
+               dev_err(card->dev,
+                       "ASoC: Property '%s' does not exist\n", propname);
+               return -EINVAL;
+       }
+       if (num_widgets & 1) {
+               dev_err(card->dev,
+                       "ASoC: Property '%s' length is not even\n", propname);
+               return -EINVAL;
+       }
+
+       num_widgets /= 2;
+       if (!num_widgets) {
+               dev_err(card->dev, "ASoC: Property '%s's length is zero\n",
+                       propname);
+               return -EINVAL;
+       }
+
+       widgets = devm_kcalloc(card->dev, num_widgets, sizeof(*widgets),
+                              GFP_KERNEL);
+       if (!widgets) {
+               dev_err(card->dev,
+                       "ASoC: Could not allocate memory for widgets\n");
+               return -ENOMEM;
+       }
+
+       for (i = 0; i < num_widgets; i++) {
+               ret = of_property_read_string_index(np, propname,
+                       2 * i, &template);
+               if (ret) {
+                       dev_err(card->dev,
+                               "ASoC: Property '%s' index %d read error:%d\n",
+                               propname, 2 * i, ret);
+                       return -EINVAL;
+               }
+
+               for (j = 0; j < ARRAY_SIZE(simple_widgets); j++) {
+                       if (!strncmp(template, simple_widgets[j].name,
+                                    strlen(simple_widgets[j].name))) {
+                               widgets[i] = simple_widgets[j];
+                               break;
+                       }
+               }
+
+               if (j >= ARRAY_SIZE(simple_widgets)) {
+                       dev_err(card->dev,
+                               "ASoC: DAPM widget '%s' is not supported\n",
+                               template);
+                       return -EINVAL;
+               }
+
+               ret = of_property_read_string_index(np, propname,
+                                                   (2 * i) + 1,
+                                                   &wname);
+               if (ret) {
+                       dev_err(card->dev,
+                               "ASoC: Property '%s' index %d read error:%d\n",
+                               propname, (2 * i) + 1, ret);
+                       return -EINVAL;
+               }
+
+               widgets[i].name = wname;
+       }
+
+       card->dapm_widgets = widgets;
+       card->num_dapm_widgets = num_widgets;
+
+       return 0;
+}
+EXPORT_SYMBOL_GPL(snd_soc_of_parse_audio_simple_widgets);
+
 int snd_soc_of_parse_audio_routing(struct snd_soc_card *card,
                                   const char *propname)
 {