lkml.org 
[lkml]   [2018]   [Jun]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 3/5] mfd: ti_am335x_tscadc: Keep ADC interface on if child is wakeup capable
Date
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>
---
drivers/mfd/ti_am335x_tscadc.c | 13 +++++++++++++
1 file changed, 13 insertions(+)

diff --git a/drivers/mfd/ti_am335x_tscadc.c b/drivers/mfd/ti_am335x_tscadc.c
index 858c1a071a81..c21ed54d1662 100644
--- a/drivers/mfd/ti_am335x_tscadc.c
+++ b/drivers/mfd/ti_am335x_tscadc.c
@@ -294,11 +294,24 @@ 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;
--
2.18.0
\
 
 \ /
  Last update: 2018-06-30 12:35    [W:0.446 / U:1.384 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site