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hwmon: (corsair-psu) fix suspend behavior
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During standby some PSUs turn off the microcontroller. A re-init is
required during resume or the microcontroller stays unresponsive.

Fixes: d115b51 ("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>
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Wilken Gottwalt authored and Guenter Roeck committed Jun 9, 2021
1 parent faffc5d commit 7656cd2
Showing 1 changed file with 14 additions and 0 deletions.
14 changes: 14 additions & 0 deletions drivers/hwmon/corsair-psu.c
Original file line number Diff line number Diff line change
@@ -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);

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