linux-4.4.1/snd_soc_of_parse_audio_simple_widgets() の履歴(No.1)

• 履歴一覧
• 差分 を表示
• 現在との差分 を表示
• ソース を表示
• linux-4.4.1/snd_soc_of_parse_audio_simple_widgets() へ行く。
  • 1 (2016-07-28 (木) 13:30:13)

参照元†

説明†

• パス: linux-4.4.1/sound/soc/soc-core.c

• FIXME: これは何？
  • 説明

引数†

• struct snd_soc_card *card
  • [[linux-4.4.1/]]
• const char *propname

返り値†

• int

参考†

実装†

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;

• • linux-4.4.1/device_node
  • linux-4.4.1/snd_soc_dapm_widget

        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;
        }

• • linux-4.4.1/of_property_count_strings()

        num_widgets /= 2;
        if (!num_widgets) {
                dev_err(card->dev, "ASoC: Property '%s's length is zero\n",
                        propname);
                return -EINVAL;
        }

• • linux-4.4.1/dev_err()

        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;
        }

• • linux-4.4.1/devm_kcalloc()

        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;
                }

• • linux-4.4.1/of_property_read_string_index()

                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;
                        }
                }

• • linux-4.4.1/ARRAY_SIZE()
  • linux-4.4.1/strncmp()
  • linux-4.4.1/strlen()

                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->of_dapm_widgets = widgets;
        card->num_of_dapm_widgets = num_widgets;

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_of_parse_audio_simple_widgets);

• • linux-4.4.1/EXPORT_SYMBOL_GPL()

コメント†