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

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[ 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: Vignesh R <vigneshr@ti.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Vignesh R 2018-06-30 16:03:16 +05:30 committed by Greg Kroah-Hartman
parent 0f07c78437
commit 1faf8a9c76
1 changed files with 13 additions and 0 deletions
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13
drivers/mfd/ti_am335x_tscadc.c
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@ -296,11 +296,24 @@ 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;