hwmon: (corsair-psu) fix suspend behavior

During standby some PSUs turn off the microcontroller. A re-init is
required during resume or the microcontroller stays unresponsive.

Fixes: d115b51e0e56 ("hwmon: add Corsair PSU HID controller driver")
Signed-off-by: Wilken Gottwalt <wilken.gottwalt@posteo.net>
Link: https://lore.kernel.org/r/YLjCJiVtu5zgTabI@monster.powergraphx.local
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

diff --git a/drivers/hwmon/corsair-psu.c b/drivers/hwmon/corsair-psu.c
index 02298b8..731d511 100644 (file)
--- a/drivers/hwmon/corsair-psu.c
+++ b/drivers/hwmon/corsair-psu.c
@@ -771,6 +771,16 @@ static int corsairpsu_raw_event(struct hid_device *hdev, struct hid_report *repo
        return 0;
 }
 
+#ifdef CONFIG_PM
+static int corsairpsu_resume(struct hid_device *hdev)
+{
+       struct corsairpsu_data *priv = hid_get_drvdata(hdev);
+
+       /* some PSUs turn off the microcontroller during standby, so a reinit is required */
+       return corsairpsu_init(priv);
+}
+#endif
+
 static const struct hid_device_id corsairpsu_idtable[] = {
        { HID_USB_DEVICE(0x1b1c, 0x1c03) }, /* Corsair HX550i */
        { HID_USB_DEVICE(0x1b1c, 0x1c04) }, /* Corsair HX650i */
@@ -793,6 +803,10 @@ static struct hid_driver corsairpsu_driver = {
        .probe          = corsairpsu_probe,
        .remove         = corsairpsu_remove,
        .raw_event      = corsairpsu_raw_event,
+#ifdef CONFIG_PM
+       .resume         = corsairpsu_resume,
+       .reset_resume   = corsairpsu_resume,
+#endif
 };
 module_hid_driver(corsairpsu_driver);