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

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Date:	Mon, 20 Feb 2012 21:32:32 +0000
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Samuel Ortiz <sameo@...ux.intel.com>
Cc:	linux-kernel@...r.kernel.org,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	stable@...r.kernel.org
Subject: [PATCH 3.3] mfd: Test for jack detection when deciding if wm8994 should suspend

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@...nsource.wolfsonmicro.com>
Cc: stable@...r.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

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