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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: Hui Wang <jason77.wang@gmail.com>
Reviewed-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Hui Wang 2011-10-12 21:11:16 -07:00 committed by Dmitry Torokhov
parent 05be8b81aa
commit 81e8f2bc82
1 changed files with 44 additions and 0 deletions
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44
drivers/input/keyboard/imx_keypad.c
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@ -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),