[media] em28xx-audio: implement em28xx_ops: suspend/resume hooks

Implement em28xx_ops: suspend/resume hooks. em28xx usb driver will
invoke em28xx_ops: suspend and resume hooks for all its extensions
from its suspend() and resume() interfaces.
Signed-off-by: NShuah Khan <shuah.kh@samsung.com>
Signed-off-by: NMauro Carvalho Chehab <m.chehab@samsung.com>

drivers/media/usb/em28xx/em28xx-audio.c

@@ -989,11 +989,41 @@ static int em28xx_audio_fini(struct em28xx *dev)
 	return 0;
 }
 
+static int em28xx_audio_suspend(struct em28xx *dev)
+{
+	if (dev == NULL)
+		return 0;
+
+	if (!dev->has_alsa_audio)
+		return 0;
+
+	em28xx_info("Suspending audio extension");
+	em28xx_deinit_isoc_audio(dev);
+	atomic_set(&dev->stream_started, 0);
+	return 0;
+}
+
+static int em28xx_audio_resume(struct em28xx *dev)
+{
+	if (dev == NULL)
+		return 0;
+
+	if (!dev->has_alsa_audio)
+		return 0;
+
+	em28xx_info("Resuming audio extension");
+	/* Nothing to do other than schedule_work() ?? */
+	schedule_work(&dev->wq_trigger);
+	return 0;
+}
+
 static struct em28xx_ops audio_ops = {
 	.id   = EM28XX_AUDIO,
 	.name = "Em28xx Audio Extension",
 	.init = em28xx_audio_init,
 	.fini = em28xx_audio_fini,
+	.suspend = em28xx_audio_suspend,
+	.resume = em28xx_audio_resume,
 };
 
 static int __init em28xx_alsa_register(void)