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authorMark Brown <broonie@opensource.wolfsonmicro.com>2010-01-02 13:15:56 +0000
committerMark Brown <broonie@opensource.wolfsonmicro.com>2010-01-04 21:51:13 +0000
commit53242c68333570631a15a69842851b458eca3d99 (patch)
tree256d4b739f523fe1b523189831fc72c3b1554d81 /sound/soc/codecs/wm8993.c
parent10505634bfa74871118a21eef8617acad00e4019 (diff)
ASoC: Implement suspend and resume for WM8993
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Diffstat (limited to 'sound/soc/codecs/wm8993.c')
-rw-r--r--sound/soc/codecs/wm8993.c67
1 files changed, 67 insertions, 0 deletions
diff --git a/sound/soc/codecs/wm8993.c b/sound/soc/codecs/wm8993.c
index 5e32f2ed5fc..cd2bc05f78c 100644
--- a/sound/soc/codecs/wm8993.c
+++ b/sound/soc/codecs/wm8993.c
@@ -227,6 +227,7 @@ struct wm8993_priv {
int class_w_users;
unsigned int fll_fref;
unsigned int fll_fout;
+ int fll_src;
};
static unsigned int wm8993_read_hw(struct snd_soc_codec *codec, u8 reg)
@@ -506,6 +507,7 @@ static int wm8993_set_fll(struct snd_soc_dai *dai, int fll_id, int source,
wm8993->fll_fref = Fref;
wm8993->fll_fout = Fout;
+ wm8993->fll_src = source;
return 0;
}
@@ -1480,9 +1482,74 @@ static int wm8993_remove(struct platform_device *pdev)
return 0;
}
+#ifdef CONFIG_PM
+static int wm8993_suspend(struct platform_device *pdev, pm_message_t state)
+{
+ struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+ struct snd_soc_codec *codec = socdev->card->codec;
+ struct wm8993_priv *wm8993 = codec->private_data;
+ int fll_fout = wm8993->fll_fout;
+ int fll_fref = wm8993->fll_fref;
+ int ret;
+
+ /* Stop the FLL in an orderly fashion */
+ ret = wm8993_set_fll(codec->dai, 0, 0, 0, 0);
+ if (ret != 0) {
+ dev_err(&pdev->dev, "Failed to stop FLL\n");
+ return ret;
+ }
+
+ wm8993->fll_fout = fll_fout;
+ wm8993->fll_fref = fll_fref;
+
+ wm8993_set_bias_level(codec, SND_SOC_BIAS_OFF);
+
+ return 0;
+}
+
+static int wm8993_resume(struct platform_device *pdev)
+{
+ struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+ struct snd_soc_codec *codec = socdev->card->codec;
+ struct wm8993_priv *wm8993 = codec->private_data;
+ u16 *cache = wm8993->reg_cache;
+ int i, ret;
+
+ /* Restore the register settings */
+ for (i = 1; i < WM8993_MAX_REGISTER; i++) {
+ if (cache[i] == wm8993_reg_defaults[i])
+ continue;
+ snd_soc_write(codec, i, cache[i]);
+ }
+
+ wm8993_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
+
+ /* Restart the FLL? */
+ if (wm8993->fll_fout) {
+ int fll_fout = wm8993->fll_fout;
+ int fll_fref = wm8993->fll_fref;
+
+ wm8993->fll_fref = 0;
+ wm8993->fll_fout = 0;
+
+ ret = wm8993_set_fll(codec->dai, 0, wm8993->fll_src,
+ fll_fref, fll_fout);
+ if (ret != 0)
+ dev_err(codec->dev, "Failed to restart FLL\n");
+ }
+
+ return 0;
+}
+#else
+#define wm8993_suspend NULL
+#define wm8993_resume NULL
+#endif
+
struct snd_soc_codec_device soc_codec_dev_wm8993 = {
.probe = wm8993_probe,
.remove = wm8993_remove,
+ .suspend = wm8993_suspend,
+ .resume = wm8993_resume,
};
EXPORT_SYMBOL_GPL(soc_codec_dev_wm8993);