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

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

drivers/input/serio/hyperv-keyboard.c

+27 −0
Original line number Diff line number Diff line
@@ -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,

	},