[PATCH 4/4] usb: usb251xb: add pm_ops

[Marco Felsch]

Currently the driver don't support pm_ops. These ops are not necessary
if the supply isn't switchable (always on). This assumptions seems to be
wrong because no one needs a powered hub during suspend-to-ram/disk.

So adding simple_dev_pm_ops to be able to switch off the hub during
suspend and to restore the config after a resume operation.

Signed-off-by: Marco Felsch <m.fel...@pengutronix.de>
---
 drivers/usb/misc/usb251xb.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/drivers/usb/misc/usb251xb.c b/drivers/usb/misc/usb251xb.c
index bc031d33f433..5bba19937da1 100644
--- a/drivers/usb/misc/usb251xb.c
+++ b/drivers/usb/misc/usb251xb.c
@@ -701,6 +701,29 @@ static int usb251xb_i2c_probe(struct i2c_client *i2c,
        return usb251xb_probe(hub);
 }
 
+static int __maybe_unused usb251xb_suspend(struct device *dev)
+{
+       struct i2c_client *client = to_i2c_client(dev);
+       struct usb251xb *hub = i2c_get_clientdata(client);
+
+       return regulator_disable(hub->vdd);
+}
+
+static int __maybe_unused usb251xb_resume(struct device *dev)
+{
+       struct i2c_client *client = to_i2c_client(dev);
+       struct usb251xb *hub = i2c_get_clientdata(client);
+       int err;
+
+       err = regulator_enable(hub->vdd);
+       if (err)
+               return err;
+
+       return usb251xb_connect(hub);
+}
+
+static SIMPLE_DEV_PM_OPS(usb251xb_pm_ops, usb251xb_suspend, usb251xb_resume);
+
 static const struct i2c_device_id usb251xb_id[] = {
        { "usb2512b", 0 },
        { "usb2512bi", 0 },
@@ -718,6 +741,7 @@ static struct i2c_driver usb251xb_i2c_driver = {
        .driver = {
                .name = DRIVER_NAME,
                .of_match_table = of_match_ptr(usb251xb_of_match),
+               .pm = &usb251xb_pm_ops,
        },
        .probe    = usb251xb_i2c_probe,
        .id_table = usb251xb_id,
-- 
2.20.1