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| author |   Hui Wang <jason77.wang@gmail.com> | 2011-10-12 21:11:16 -0700 |
|---|---|---|
| committer |   Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2011-10-12 21:13:16 -0700 |
| commit | 81e8f2bc82cd591a749c0cc5694f57676db749ae (patch) | |
| tree | 1b1939b610b9c65638cb9092dda8f1597ab64cba /drivers/input | |
| parent | Input: force feedback - potential integer wrap in input_ff_create() (diff) | |
| download | linux-dev-81e8f2bc82cd591a749c0cc5694f57676db749ae.tar.xz linux-dev-81e8f2bc82cd591a749c0cc5694f57676db749ae.zip | |
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>
Diffstat (limited to 'drivers/input')
| -rw-r--r-- | drivers/input/keyboard/imx_keypad.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/drivers/input/keyboard/imx_keypad.c b/drivers/input/keyboard/imx_keypad.c index 4b093faf5786..ccebd2d09151 100644 --- a/drivers/input/keyboard/imx_keypad.c +++ b/drivers/input/keyboard/imx_keypad.c @@ -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), |