[PATCH v4] Input: sun4i-lradc-keys - Add wakup support
From: Samuel Holland <samuel@sholland.org>
Date: 2021-11-19 02:54:22
Also in:
linux-sunxi, lkml
Subsystem:
input (keyboard, mouse, joystick, touchscreen) drivers, sun4i low res adc attached tablet keys driver, the rest · Maintainers:
Dmitry Torokhov, Hans de Goede, Linus Torvalds
From: Ondrej Jirman <redacted>
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 <redacted>
Signed-off-by: Samuel Holland <samuel@sholland.org>
---
Changes since v3:
- Only mark device as wakeup capable if setting the wakeirq succeeds
- An entirely different, but equivalent, DT binding patch was merged,
so there is only one patch left
Changes since v2:
- Dropped unnecessary pr_err in platform_get_irq() error path
- Dropped patch 3 (DT update) as it was merged
- Added Acked-by/Reviewed-by tags
Changes since v1:
- Add requisite DT binding change
- Only add wakeup capability if "wakeup-source" is present
- Warn but do not error out if setting the wake IRQ fails
- Add "wakeup-source" property to PinePhone device tree
---
drivers/input/keyboard/sun4i-lradc-keys.c | 20 ++++++++++++++++----
1 file changed, 16 insertions(+), 4 deletions(-)
diff --git a/drivers/input/keyboard/sun4i-lradc-keys.c b/drivers/input/keyboard/sun4i-lradc-keys.c
index 4a796bed48ac..781f9b053115 100644
--- a/drivers/input/keyboard/sun4i-lradc-keys.c
+++ b/drivers/input/keyboard/sun4i-lradc-keys.c@@ -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 +286,14 @@ 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 wake IRQ\n"); + else + device_set_wakeup_capable(dev, true); + } + return 0; }
--
2.32.0