ASoC: Implement runtime PM for WM8994/58

This allows us to communicate our power management state back to the
parent device, allowing it to do a full power down when the device is
idle.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>

diff --git a/sound/soc/codecs/wm8994.c b/sound/soc/codecs/wm8994.c
index 5f203c545e002932b3cc2587fab02f962385f667..bfd4cf4fde5fac5ef9eaae0c5a5056391d7f8612 100644 (file)
--- a/sound/soc/codecs/wm8994.c
+++ b/sound/soc/codecs/wm8994.c
@@ -18,6 +18,7 @@
 #include <linux/pm.h>
 #include <linux/i2c.h>
 #include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
 #include <linux/regulator/consumer.h>
 #include <linux/slab.h>
 #include <sound/core.h>
@@ -1803,6 +1804,8 @@ static int wm8994_set_bias_level(struct snd_soc_codec *codec,
 
        case SND_SOC_BIAS_STANDBY:
                if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) {
+                       pm_runtime_get_sync(codec->dev);
+
                        /* Tweak DC servo and DSP configuration for
                         * improved performance. */
                        if (control->type == WM8994 && wm8994->revision < 4) {
@@ -1878,6 +1881,8 @@ static int wm8994_set_bias_level(struct snd_soc_codec *codec,
                                            WM8994_STARTUP_BIAS_ENA |
                                            WM8994_VMID_BUF_ENA |
                                            WM8994_VMID_RAMP_MASK, 0);
+
+                       pm_runtime_put(codec->dev);
                }
                break;
        }
@@ -2780,6 +2785,9 @@ static int wm8994_codec_probe(struct snd_soc_codec *codec)
        wm8994->pdata = dev_get_platdata(codec->dev->parent);
        wm8994->codec = codec;
 
+       pm_runtime_enable(codec->dev);
+       pm_runtime_resume(codec->dev);
+
        /* Read our current status back from the chip - we don't want to
         * reset as this may interfere with the GPIO or LDO operation. */
        for (i = 0; i < WM8994_CACHE_SIZE; i++) {
@@ -2995,6 +3003,8 @@ static int  wm8994_codec_remove(struct snd_soc_codec *codec)
 
        wm8994_set_bias_level(codec, SND_SOC_BIAS_OFF);
 
+       pm_runtime_disable(codec->dev);
+
        switch (control->type) {
        case WM8994:
                wm8994_free_irq(codec->control_data, WM8994_IRQ_MIC2_SHRT,