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Commit 81e8f2bc authored by Hui Wang's avatar Hui Wang Committed by Dmitry Torokhov
Browse files

Input: imx_keypad - add pm suspend and resume support 



The imx_keypad driver was indicating that it was wakeup capable in
imx_keypad_probe(), but it didn't implement suspend or resume methods.

According to the i.MX series MCU Reference Manual, the kpp (keypad
port) is a major wake up source which can detect any key press even
in low power mode and even when there is no clock.

Signed-off-by: default avatarHui Wang <jason77.wang@gmail.com>
Reviewed-by: default avatarWanlong Gao <gaowanlong@cn.fujitsu.com>
Signed-off-by: default avatarDmitry Torokhov <dtor@mail.ru>
parent 05be8b81

drivers/input/keyboard/imx_keypad.c

+44 −0
Original line number Diff line number Diff line
@@ -567,10 +567,54 @@ static int __devexit imx_keypad_remove(struct platform_device *pdev) 
	return 0;

}



#ifdef CONFIG_PM_SLEEP

static int imx_kbd_suspend(struct device *dev)

{

	struct platform_device *pdev = to_platform_device(dev);

	struct imx_keypad *kbd = platform_get_drvdata(pdev);

	struct input_dev *input_dev = kbd->input_dev;



	/* imx kbd can wake up system even clock is disabled */

	mutex_lock(&input_dev->mutex);



	if (input_dev->users)

		clk_disable(kbd->clk);



	mutex_unlock(&input_dev->mutex);



	if (device_may_wakeup(&pdev->dev))

		enable_irq_wake(kbd->irq);



	return 0;

}



static int imx_kbd_resume(struct device *dev)

{

	struct platform_device *pdev = to_platform_device(dev);

	struct imx_keypad *kbd = platform_get_drvdata(pdev);

	struct input_dev *input_dev = kbd->input_dev;



	if (device_may_wakeup(&pdev->dev))

		disable_irq_wake(kbd->irq);



	mutex_lock(&input_dev->mutex);



	if (input_dev->users)

		clk_enable(kbd->clk);



	mutex_unlock(&input_dev->mutex);



	return 0;

}

#endif



static SIMPLE_DEV_PM_OPS(imx_kbd_pm_ops, imx_kbd_suspend, imx_kbd_resume);



static struct platform_driver imx_keypad_driver = {

	.driver		= {

		.name	= "imx-keypad",

		.owner	= THIS_MODULE,

		.pm	= &imx_kbd_pm_ops,

	},

	.probe		= imx_keypad_probe,

	.remove		= __devexit_p(imx_keypad_remove),