[PATCH 4/4] ALSA: gusmax: add ISA suspend and resume callbacks

[Cássio Gabriel]

gusmax still leaves its ISA PM callbacks disabled even though the shared
GF1 suspend and resume path now exists.

This board needs one extra piece of PM glue around the shared GF1 helpers.
The attached WSS codec has its own register image that must be saved and
restored across suspend, and the MAX control register must be rewritten on
resume before the codec and GF1 sides are brought back.

Use the existing wss->suspend() and wss->resume() hooks for the codec, then
wire the driver up to the shared GUS suspend and resume helpers for the GF1
side.

Signed-off-by: Cássio Gabriel <cassiogabrielcontato@xxxxxxxxx>
---
 sound/isa/gus/gusmax.c | 28 +++++++++++++++++++++++++++-
 1 file changed, 27 insertions(+), 1 deletion(-)

diff --git a/sound/isa/gus/gusmax.c b/sound/isa/gus/gusmax.c
index b572411c4422..f1fd7ff2121d 100644
--- a/sound/isa/gus/gusmax.c
+++ b/sound/isa/gus/gusmax.c
@@ -328,12 +328,38 @@ static int snd_gusmax_probe(struct device *pdev, unsigned int dev)
 	return 0;
 }
 
+#ifdef CONFIG_PM
+static int snd_gusmax_suspend(struct device *dev, unsigned int n,
+			      pm_message_t state)
+{
+	struct snd_card *card = dev_get_drvdata(dev);
+	struct snd_gusmax *maxcard = card->private_data;
+
+	maxcard->wss->suspend(maxcard->wss);
+	return snd_gus_suspend(maxcard->gus);
+}
+
+static int snd_gusmax_resume(struct device *dev, unsigned int n)
+{
+	struct snd_card *card = dev_get_drvdata(dev);
+	struct snd_gusmax *maxcard = card->private_data;
+
+	/* Restore the board routing latch before resuming the codec and GF1. */
+	outb(maxcard->gus->max_cntrl_val, GUSP(maxcard->gus, MAXCNTRLPORT));
+	maxcard->wss->resume(maxcard->wss);
+	return snd_gus_resume(maxcard->gus);
+}
+#endif
+
 #define DEV_NAME "gusmax"
 
 static struct isa_driver snd_gusmax_driver = {
 	.match		= snd_gusmax_match,
 	.probe		= snd_gusmax_probe,
-	/* FIXME: suspend/resume */
+#ifdef CONFIG_PM
+	.suspend	= snd_gusmax_suspend,
+	.resume		= snd_gusmax_resume,
+#endif
 	.driver		= {
 		.name	= DEV_NAME
 	},

-- 
2.53.0