summaryrefslogtreecommitdiffstats
path: root/drivers/mfd
diff options
context:
space:
mode:
authorVignesh R <vigneshr@ti.com>2018-06-30 16:03:16 +0530
committerLee Jones <lee.jones@linaro.org>2018-10-09 11:28:07 +0100
commitc974ac771479327b5424f60d58845e31daddadea (patch)
treed748d0d854eec971064d03d6868d0b46e8ba0e8c /drivers/mfd
parent333e07ec4b3397f16f34b2eabae703a2885f3558 (diff)
downloadlinux-c974ac771479327b5424f60d58845e31daddadea.tar.bz2
mfd: ti_am335x_tscadc: Keep ADC interface on if child is wakeup capable
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>
Diffstat (limited to 'drivers/mfd')
-rw-r--r--drivers/mfd/ti_am335x_tscadc.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/mfd/ti_am335x_tscadc.c b/drivers/mfd/ti_am335x_tscadc.c
index ee3ffd96f5d2..c2d47d78705b 100644
--- a/drivers/mfd/ti_am335x_tscadc.c
+++ b/drivers/mfd/ti_am335x_tscadc.c
@@ -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;