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Input: sun4i-lradc-keys - add wakeup support

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Allow the driver to wake the system on key press if the "wakeup-source"
property is provided in the device tree. Using the LRADC as a wakeup
source requires keeping the AVCC domain active during sleep. Since this
has a nontrivial impact on power consumption (sometimes doubling it),
disable the LRADC wakeup source by default.

Signed-off-by: Ondrej Jirman <x@xff.cz>
Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Signed-off-by: Samuel Holland <samuel@sholland.org>
Link: https://lore.kernel.org/r/20220424161328.61103-1-samuel@sholland.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Ondrej Jirman 2022-04-24 18:02:17 -07:00 committed by Dmitry Torokhov
parent be8fc023ef
commit b243018eaf
1 changed files with 18 additions and 4 deletions
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22
drivers/input/keyboard/sun4i-lradc-keys.c
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@ -22,6 +22,8 @@
#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/pm_wakeirq.h>
#include <linux/pm_wakeup.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
@ -226,8 +228,7 @@ static int sun4i_lradc_probe(struct platform_device *pdev)
{
struct sun4i_lradc_data *lradc;
struct device *dev = &pdev->dev;
int i;
int error;
int error, i, irq;
lradc = devm_kzalloc(dev, sizeof(struct sun4i_lradc_data), GFP_KERNEL);
if (!lradc)
@ -272,8 +273,11 @@ static int sun4i_lradc_probe(struct platform_device *pdev)
if (IS_ERR(lradc->base))
return PTR_ERR(lradc->base);
error = devm_request_irq(dev, platform_get_irq(pdev, 0),
sun4i_lradc_irq, 0,
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
error = devm_request_irq(dev, irq, sun4i_lradc_irq, 0,
"sun4i-a10-lradc-keys", lradc);
if (error)
return error;
@ -282,6 +286,16 @@ static int sun4i_lradc_probe(struct platform_device *pdev)
if (error)
return error;
if (device_property_read_bool(dev, "wakeup-source")) {
error = dev_pm_set_wake_irq(dev, irq);
if (error)
dev_warn(dev,
"Failed to set IRQ %d as a wake IRQ: %d\n",
irq, error);
else
device_set_wakeup_capable(dev, true);
}
return 0;
}