[PATCH 01/25] ALSA: hda: Introduce auto cleanup macros for PM

[Takashi Iwai <tiwai@suse.de>]

The temporary power up/down of the codec via snd_hda_power_up() and
_down() (or snd_hda_power_up_pm() and _down_pm()) is seen in various
places.  This patch introduces simple auto-cleanup macros for those
call patterns, so that the drivers don't have to call the
corresponding power-down calls explicitly.

Namely,
	err = snd_hda_power_up(codec);
	if (err < 0)
		return err;
	....
	snd_power_down(codec);

can drop the *_down() call by replacing with
	CLASS(snd_hda_power, pm)(codec);
	if (pm.err < 0)
		return pm.err;

Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
 include/sound/hda_codec.h | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/include/sound/hda_codec.h b/include/sound/hda_codec.h
index ddc9c392f93f..e83501ff2875 100644
--- a/include/sound/hda_codec.h
+++ b/include/sound/hda_codec.h
@@ -503,6 +503,36 @@ static inline bool hda_codec_need_resume(struct hda_codec *codec)
 	return !codec->relaxed_resume && codec->jacktbl.used;
 }
 
+/*
+ * PM with auto-cleanup: call like CLASS(snd_hda_power, pm)(codec)
+ * If the error handling is needed, refer pm.err.
+ */
+struct __hda_power_obj {
+	struct hda_codec *codec;
+	int err;
+};
+
+static inline struct __hda_power_obj __snd_hda_power_up(struct hda_codec *codec)
+{
+	struct __hda_power_obj T = { .codec = codec };
+	T.err = snd_hda_power_up(codec);
+	return T;
+}
+
+static inline struct __hda_power_obj __snd_hda_power_up_pm(struct hda_codec *codec)
+{
+	struct __hda_power_obj T = { .codec = codec };
+	T.err = snd_hda_power_up_pm(codec);
+	return T;
+}
+
+DEFINE_CLASS(snd_hda_power, struct __hda_power_obj,
+	     snd_hda_power_down((_T).codec), __snd_hda_power_up(codec),
+	     struct hda_codec *codec)
+DEFINE_CLASS(snd_hda_power_pm, struct __hda_power_obj,
+	     snd_hda_power_down_pm((_T).codec), __snd_hda_power_up_pm(codec),
+	     struct hda_codec *codec)
+
 #ifdef CONFIG_SND_HDA_PATCH_LOADER
 /*
  * patch firmware
-- 
2.50.1