ALSA: snd-ad1816a: Implement suspend/resume

Implement suspend/resume support for AD1816 chips.
Tested with Terratec SoundSystem Base-1.

Signed-off-by: Ondrej Zary <linux@rainbow-software.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

3 files changed, 59 insertions, 2 deletions

diff --git a/include/sound/ad1816a.h b/include/sound/ad1816a.h
index 62da41e508e1..2a89f0d71440 100644
--- a/include/sound/ad1816a.h
+++ b/include/sound/ad1816a.h
@@ -147,6 +147,9 @@ struct snd_ad1816a {
         unsigned int c_dma_size;
 
         struct snd_timer *timer;
+#ifdef CONFIG_PM
+        unsigned short image[48];
+#endif
 };
 
 
@@ -171,5 +174,9 @@ extern int snd_ad1816a_pcm(struct snd_ad1816a *chip, int device, struct snd_pcm
 extern int snd_ad1816a_mixer(struct snd_ad1816a *chip);
 extern int snd_ad1816a_timer(struct snd_ad1816a *chip, int device,
                              struct snd_timer **rtimer);
+#ifdef CONFIG_PM
+extern void snd_ad1816a_suspend(struct snd_ad1816a *chip);
+extern void snd_ad1816a_resume(struct snd_ad1816a *chip);
+#endif
 
 #endif  /* __SOUND_AD1816A_H */
diff --git a/sound/isa/ad1816a/ad1816a.c b/sound/isa/ad1816a/ad1816a.c
index 1a374e61ab2b..2c2f829c3fd7 100644
--- a/sound/isa/ad1816a/ad1816a.c
+++ b/sound/isa/ad1816a/ad1816a.c
@@ -244,13 +244,37 @@ static void __devexit snd_ad1816a_pnp_remove(struct pnp_card_link * pcard)
         pnp_set_card_drvdata(pcard, NULL);
 }
 
+#ifdef CONFIG_PM
+static int snd_ad1816a_pnp_suspend(struct pnp_card_link *pcard,
+                                   pm_message_t state)
+{
+        struct snd_card *card = pnp_get_card_drvdata(pcard);
+
+        snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
+        snd_ad1816a_suspend(card->private_data);
+        return 0;
+}
+
+static int snd_ad1816a_pnp_resume(struct pnp_card_link *pcard)
+{
+        struct snd_card *card = pnp_get_card_drvdata(pcard);
+
+        snd_ad1816a_resume(card->private_data);
+        snd_power_change_state(card, SNDRV_CTL_POWER_D0);
+        return 0;
+}
+#endif
+
 static struct pnp_card_driver ad1816a_pnpc_driver = {
         .flags          = PNP_DRIVER_RES_DISABLE,
         .name           = "ad1816a",
         .id_table       = snd_ad1816a_pnpids,
         .probe          = snd_ad1816a_pnp_detect,
         .remove         = __devexit_p(snd_ad1816a_pnp_remove),
-        /* FIXME: suspend/resume */
+#ifdef CONFIG_PM
+        .suspend        = snd_ad1816a_pnp_suspend,
+        .resume         = snd_ad1816a_pnp_resume,
+#endif
 };
 
 static int __init alsa_card_ad1816a_init(void)
diff --git a/sound/isa/ad1816a/ad1816a_lib.c b/sound/isa/ad1816a/ad1816a_lib.c
index de5cc1c26279..db64df6023e0 100644
--- a/sound/isa/ad1816a/ad1816a_lib.c
+++ b/sound/isa/ad1816a/ad1816a_lib.c
@@ -491,7 +491,7 @@ static int snd_ad1816a_capture_close(struct snd_pcm_substream *substream)
 }
 
 
-static void __devinit snd_ad1816a_init(struct snd_ad1816a *chip)
+static void snd_ad1816a_init(struct snd_ad1816a *chip)
 {
         unsigned long flags;
 
@@ -511,6 +511,32 @@ static void __devinit snd_ad1816a_init(struct snd_ad1816a *chip)
         spin_unlock_irqrestore(&chip->lock, flags);
 }
 
+#ifdef CONFIG_PM
+void snd_ad1816a_suspend(struct snd_ad1816a *chip)
+{
+        int reg;
+        unsigned long flags;
+
+        snd_pcm_suspend_all(chip->pcm);
+        spin_lock_irqsave(&chip->lock, flags);
+        for (reg = 0; reg < 48; reg++)
+                chip->image[reg] = snd_ad1816a_read(chip, reg);
+        spin_unlock_irqrestore(&chip->lock, flags);
+}
+
+void snd_ad1816a_resume(struct snd_ad1816a *chip)
+{
+        int reg;
+        unsigned long flags;
+
+        snd_ad1816a_init(chip);
+        spin_lock_irqsave(&chip->lock, flags);
+        for (reg = 0; reg < 48; reg++)
+                snd_ad1816a_write(chip, reg, chip->image[reg]);
+        spin_unlock_irqrestore(&chip->lock, flags);
+}
+#endif
+
 static int __devinit snd_ad1816a_probe(struct snd_ad1816a *chip)
 {
         unsigned long flags;