[PATCH v2] hwmon: corsair-psu: fix suspend behavior

[Wilken Gottwalt]

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@xxxxxxxxxx>
---
Changes in v2:
  - corrected fixes commit
---
 drivers/hwmon/corsair-psu.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/hwmon/corsair-psu.c b/drivers/hwmon/corsair-psu.c
index 02298b86b57b..731d5117f9f1 100644
--- 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);
 
-- 
2.31.1