linux-4.4.1/snd_soc_dapm_put_enum_double() 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_dapm_put_enum_double() へ行く。
  • 1 (2018-06-22 (金) 10:49:46)

参照元†

説明†

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

• FIXME: これは何？
  • 説明

引数†

• struct snd_kcontrol *kcontrol
  • linux-4.4.1/snd_kcontrol
• struct snd_ctl_elem_value *ucontrol
  • linux-4.4.1/snd_ctl_elem_value

返り値†

• int

参考†

実装†

/**
 * snd_soc_dapm_put_enum_double - dapm enumerated double mixer set callback
 * @kcontrol: mixer control
 * @ucontrol: control element information
 *
 * Callback to set the value of a dapm enumerated double mixer control.
 *
 * Returns 0 for success.
 */
int snd_soc_dapm_put_enum_double(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_value *ucontrol)
{
	struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kcontrol);
	struct snd_soc_card *card = dapm->card;
	struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
	unsigned int *item = ucontrol->value.enumerated.item;
	unsigned int val, change, reg_change = 0;
	unsigned int mask;
	struct snd_soc_dapm_update update;
	int ret = 0;

• • linux-4.4.1/snd_soc_dapm_context
  • linux-4.4.1/snd_soc_dapm_kcontrol_dapm()
  • linux-4.4.1/snd_soc_card
  • linux-4.4.1/soc_enum
  • linux-4.4.1/snd_soc_dapm_update

	if (item[0] >= e->items)
		return -EINVAL;

	val = snd_soc_enum_item_to_val(e, item[0]) << e->shift_l;
	mask = e->mask << e->shift_l;
	if (e->shift_l != e->shift_r) {
		if (item[1] > e->items)
			return -EINVAL;
		val |= snd_soc_enum_item_to_val(e, item[1]) << e->shift_l;
		mask |= e->mask << e->shift_r;
	}

• • linux-4.4.1/snd_soc_enum_item_to_val()

	mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);

• • linux-4.4.1/mutex_lock_nexted()

	change = dapm_kcontrol_set_value(kcontrol, val);

	if (e->reg != SND_SOC_NOPM)
		reg_change = soc_dapm_test_bits(dapm, e->reg, mask, val);

• • linux-4.4.1/soc_dapm_test_bits()

	if (change || reg_change) {
		if (reg_change) {
			update.kcontrol = kcontrol;
			update.reg = e->reg;
			update.mask = mask;
			update.val = val;
			card->update = &update;
		}
		change |= reg_change;

		ret = soc_dapm_mux_update_power(card, kcontrol, item[0], e);

• • linux-4.4.1/snd_dapm_mux_update_power()

		card->update = NULL;
	}

	mutex_unlock(&card->dapm_mutex);

• • linux-4.4.1/mutex_unlock()

	if (ret > 0)
		soc_dpcm_runtime_update(card);

• • linux-4.4.1/soc_dpcm_runtime_update()

	return change;
}
EXPORT_SYMBOL_GPL(snd_soc_dapm_put_enum_double);

• GPL ライセンスのモジュールにのみシンボルを公開する。
  • linux-4.4.1/EXPORT_SYMBOL_GPL()

コメント†