media: sunxi-cir: Implement suspend/resume/shutdown callbacks

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

Acked-by: Maxime Ripard <mripard@kernel.org>
Signed-off-by: Samuel Holland <samuel@sholland.org>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

diff --git a/drivers/media/rc/sunxi-cir.c b/drivers/media/rc/sunxi-cir.c
index 2d099da..168e1d2 100644 (file)
--- 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,
        },
 };