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Commit 8bda8034 authored by Vignesh R's avatar Vignesh R Committed by Greg Kroah-Hartman
Browse files

mfd: ti_am335x_tscadc: Keep ADC interface on if child is wakeup capable 



[ Upstream commit c974ac771479327b5424f60d58845e31daddadea ]

If a child device like touchscreen is wakeup capable, then keep ADC
interface on, so that a touching resistive screen will generate wakeup
event to the system.

Signed-off-by: default avatarVignesh R <vigneshr@ti.com>
Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent 1a103006

drivers/mfd/ti_am335x_tscadc.c

+13 −0
Original line number Diff line number Diff line
@@ -295,11 +295,24 @@ static int ti_tscadc_remove(struct platform_device *pdev) 
	return 0;

}



static int __maybe_unused ti_tscadc_can_wakeup(struct device *dev, void *data)

{

	return device_may_wakeup(dev);

}



static int __maybe_unused tscadc_suspend(struct device *dev)

{

	struct ti_tscadc_dev	*tscadc = dev_get_drvdata(dev);



	regmap_write(tscadc->regmap, REG_SE, 0x00);

	if (device_for_each_child(dev, NULL, ti_tscadc_can_wakeup)) {

		u32 ctrl;



		regmap_read(tscadc->regmap, REG_CTRL, &ctrl);

		ctrl &= ~(CNTRLREG_POWERDOWN);

		ctrl |= CNTRLREG_TSCSSENB;

		regmap_write(tscadc->regmap, REG_CTRL, ctrl);

	}

	pm_runtime_put_sync(dev);



	return 0;