[3/5] mfd: ti_am335x_tscadc: Keep ADC interface on if child is wakeup capable
diff mbox

Message ID 20180630103318.25355-4-vigneshr@ti.com
State New
Headers show

Commit Message

Vignesh Raghavendra June 30, 2018, 10:33 a.m. UTC
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(+)

Comments

Lee Jones July 4, 2018, 7:39 a.m. UTC | #1
On Sat, 30 Jun 2018, Vignesh R wrote:

> 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(+)

For my own reference:
  Acked-for-MFD-by: Lee Jones <lee.jones@linaro.org>
Lee Jones Oct. 9, 2018, 10:30 a.m. UTC | #2
On Sat, 30 Jun 2018, Vignesh R wrote:

> 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(+)

Applied, thanks.

Patch
diff mbox

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;