Commit e2379b30 authored by Dexuan Cui's avatar Dexuan Cui Committed by Sasha Levin

Input: hyperv-keyboard: Add the support of hibernation

Add suspend() and resume() functions so the Hyper-V virtual keyboard
can participate in VM hibernation.

Note that the keyboard is a "wakeup" device that could abort an in-progress
hibernation if there is keyboard event.  No attempt is made to suppress this
behavior.  If desired, a sysadmin can disable the keyboard as a wakeup device
using standard mechanisms such as:

echo disabled > /sys/bus/vmbus/drivers/hyperv_keyboard/XXX/power/wakeup
(where XXX is the device's GUID)
Reviewed-by: default avatarMichael Kelley <mikelley@microsoft.com>
Signed-off-by: default avatarDexuan Cui <decui@microsoft.com>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent d33c240d
......@@ -259,6 +259,8 @@ static int hv_kbd_connect_to_vsp(struct hv_device *hv_dev)
u32 proto_status;
int error;
reinit_completion(&kbd_dev->wait_event);
request = &kbd_dev->protocol_req;
memset(request, 0, sizeof(struct synth_kbd_protocol_request));
request->header.type = __cpu_to_le32(SYNTH_KBD_PROTOCOL_REQUEST);
......@@ -380,6 +382,29 @@ static int hv_kbd_remove(struct hv_device *hv_dev)
return 0;
}
static int hv_kbd_suspend(struct hv_device *hv_dev)
{
vmbus_close(hv_dev->channel);
return 0;
}
static int hv_kbd_resume(struct hv_device *hv_dev)
{
int ret;
ret = vmbus_open(hv_dev->channel,
KBD_VSC_SEND_RING_BUFFER_SIZE,
KBD_VSC_RECV_RING_BUFFER_SIZE,
NULL, 0,
hv_kbd_on_channel_callback,
hv_dev);
if (ret == 0)
ret = hv_kbd_connect_to_vsp(hv_dev);
return ret;
}
static const struct hv_vmbus_device_id id_table[] = {
/* Keyboard guid */
{ HV_KBD_GUID, },
......@@ -393,6 +418,8 @@ static struct hv_driver hv_kbd_drv = {
.id_table = id_table,
.probe = hv_kbd_probe,
.remove = hv_kbd_remove,
.suspend = hv_kbd_suspend,
.resume = hv_kbd_resume,
.driver = {
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
},
......
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