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From: Samuel Holland <samuel@sholland.org>
To: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: Hans de Goede <hdegoede@redhat.com>,
	Rob Herring <robh+dt@kernel.org>,
	Maxime Ripard <mripard@kernel.org>, Chen-Yu Tsai <wens@csie.org>,
	Jernej Skrabec <jernej.skrabec@siol.net>,
	devicetree@vger.kernel.org, linux-input@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-sunxi@lists.linux.dev,
	Samuel Holland <samuel@sholland.org>,
	Ondrej Jirman <megous@megous.com>
Subject: [PATCH resend v3 2/2] input: sun4i-lradc-keys - Add wakup support
Date: Thu,  5 Aug 2021 00:12:41 -0500	[thread overview]
Message-ID: <20210805051241.47168-3-samuel@sholland.org> (raw)
In-Reply-To: <20210805051241.47168-1-samuel@sholland.org>

From: Ondrej Jirman <megous@megous.com>

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.

Acked-by: Maxime Ripard <mripard@kernel.org>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Ondrej Jirman <megous@megous.com>
Signed-off-by: Samuel Holland <samuel@sholland.org>
---
 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..af1683d68c8c 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")) {
+		device_set_wakeup_capable(dev, true);
+
+		error = dev_pm_set_wake_irq(dev, irq);
+		if (error)
+			dev_warn(dev, "Failed to set wake IRQ\n");
+	}
+
 	return 0;
 }
 
-- 
2.26.3


      parent reply	other threads:[~2021-08-05  5:12 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-05  5:12 [PATCH resend v3 0/2] sunxi LRADC/volume key wakeup support Samuel Holland
2021-08-05  5:12 ` [PATCH resend v3 1/2] dt-bindings: sun4i-a10-lradc-keys: Accept wakeup-source property Samuel Holland
2021-08-05  5:12 ` Samuel Holland [this message]

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