linux-kernel - [PATCH v2 4/4] media: sunxi-cir: Implement suspend/resume/shutdown callbacks

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Date:   Mon, 18 Jan 2021 00:00:48 -0600
From:   Samuel Holland <samuel@...lland.org>
To:     Sean Young <sean@...s.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...l.net>
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...glegroups.com, Samuel Holland <samuel@...lland.org>
Subject: [PATCH v2 4/4] media: sunxi-cir: Implement suspend/resume/shutdown callbacks

To save power, gate/reset the hardware block while the system is
asleep or powered off.

Signed-off-by: Samuel Holland <samuel@...lland.org>
---
 drivers/media/rc/sunxi-cir.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/drivers/media/rc/sunxi-cir.c b/drivers/media/rc/sunxi-cir.c
index 2d099da8d3cc..168e1d2c876a 100644
--- a/drivers/media/rc/sunxi-cir.c
+++ b/drivers/media/rc/sunxi-cir.c
@@ -234,6 +234,20 @@ static void sunxi_ir_hw_exit(struct device *dev)
 	reset_control_assert(ir->rst);
 }
 
+static int __maybe_unused sunxi_ir_suspend(struct device *dev)
+{
+	sunxi_ir_hw_exit(dev);
+
+	return 0;
+}
+
+static int __maybe_unused sunxi_ir_resume(struct device *dev)
+{
+	return sunxi_ir_hw_init(dev);
+}
+
+static SIMPLE_DEV_PM_OPS(sunxi_ir_pm_ops, sunxi_ir_suspend, sunxi_ir_resume);
+
 static int sunxi_ir_probe(struct platform_device *pdev)
 {
 	int ret = 0;
@@ -362,6 +376,11 @@ static int sunxi_ir_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static void sunxi_ir_shutdown(struct platform_device *pdev)
+{
+	sunxi_ir_hw_exit(&pdev->dev);
+}
+
 static const struct sunxi_ir_quirks sun4i_a10_ir_quirks = {
 	.has_reset = false,
 	.fifo_size = 16,
@@ -397,9 +416,11 @@ MODULE_DEVICE_TABLE(of, sunxi_ir_match);
 static struct platform_driver sunxi_ir_driver = {
 	.probe          = sunxi_ir_probe,
 	.remove         = sunxi_ir_remove,
+	.shutdown       = sunxi_ir_shutdown,
 	.driver = {
 		.name = SUNXI_IR_DEV,
 		.of_match_table = sunxi_ir_match,
+		.pm = &sunxi_ir_pm_ops,
 	},
 };
 
-- 
2.26.2