[PATCH 3.3] mfd: Test for jack detection when deciding if wm8994 should suspend

[Mark Brown <broonie@opensource.wolfsonmicro.com>]

The jack detection on WM1811 is often required during system suspend, add
it as another check when deciding if we should suspend.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: stable@vger.kernel.org
---

Samuel, could you please add this to your for-linus branch?  It's been
sitting around unloved for some considerable time now...

 drivers/mfd/wm8994-core.c |   14 ++++++++++++++
 1 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/drivers/mfd/wm8994-core.c b/drivers/mfd/wm8994-core.c
index f117e7f..a04b3c1 100644
--- a/drivers/mfd/wm8994-core.c
+++ b/drivers/mfd/wm8994-core.c
@@ -256,6 +256,20 @@ static int wm8994_suspend(struct device *dev)
 		break;
 	}
 
+	switch (wm8994->type) {
+	case WM1811:
+		ret = wm8994_reg_read(wm8994, WM8994_ANTIPOP_2);
+		if (ret < 0) {
+			dev_err(dev, "Failed to read jackdet: %d\n", ret);
+		} else if (ret & WM1811_JACKDET_MODE_MASK) {
+			dev_dbg(dev, "CODEC still active, ignoring suspend\n");
+			return 0;
+		}
+		break;
+	default:
+		break;
+	}
+
 	/* Disable LDO pulldowns while the device is suspended if we
 	 * don't know that something will be driving them. */
 	if (!wm8994->ldo_ena_always_driven)
-- 
1.7.9