We use keypad_data to enable wakeup from platform data

suspend/resume is tested on an i.MX27 when keypad is not
in use and when it's is in use (in which case we immediatly
get the key pressed at wakeup)

Signed-off-by: Eric B?nard <redacted>
Cc: maramaopercheseimorto at gmail.com
Cc: linux-input at vger.kernel.org
Cc: dmitry.torokhov at gmail.com
Cc: linux-arm-kernel at lists.infradead.org
---
v2 :
	- simplify suspend & resume functions
	- convert to pm_ops

 drivers/input/keyboard/imx_keypad.c |   40 +++++++++++++++++++++++++++++++++-
 1 files changed, 38 insertions(+), 2 deletions(-)

diff --git a/drivers/input/keyboard/imx_keypad.c b/drivers/input/keyboard/imx_keypad.c
index d92c15c..9aa0005 100644
--- a/drivers/input/keyboard/imx_keypad.c
+++ b/drivers/input/keyboard/imx_keypad.c

@@ -364,6 +364,38 @@ static void imx_keypad_inhibit(struct imx_keypad *keypad)
 	writew(0xff00, keypad->mmio_base + KPCR);
 }
 
+#ifdef CONFIG_PM
+static int mxc_kpp_suspend(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct imx_keypad *keypad = platform_get_drvdata(pdev);
+
+	keypad->enabled = false;
+	synchronize_irq(keypad->irq);
+	disable_irq(keypad->irq);
+	clk_disable(keypad->clk);
+
+	return 0;
+}
+
+static int mxc_kpp_resume(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct imx_keypad *keypad = platform_get_drvdata(pdev);
+
+	keypad->enabled = true;
+	clk_enable(keypad->clk);
+	enable_irq(keypad->irq);
+
+	return 0;
+}