Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-27 14:41:39 +00:00
Code Issues Packages Projects Releases Wiki Activity

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

Browse Source 
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>
This commit is contained in:
Vignesh R 2018-06-30 16:03:16 +05:30 committed by Lee Jones
parent 333e07ec4b
commit c974ac7714
1 changed files with 13 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
drivers/mfd/ti_am335x_tscadc.c
View File

@ -293,11 +293,24 @@ 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;