Commit af13f9ed authored by Dexuan Cui's avatar Dexuan Cui Committed by Sasha Levin
Browse files

HID: hyperv: Add the support of hibernation 



During the suspend process and resume process, if there is any mouse
event, there is a small chance the suspend and the resume process can be
aborted because of mousevsc_on_receive() -> pm_wakeup_hard_event().

This behavior can be avoided by disabling the Hyper-V mouse device as
a wakeup source:

echo disabled > /sys/bus/vmbus/drivers/hid_hyperv/XXX/power/wakeup
(XXX is the device's GUID).

Signed-off-by: default avatarDexuan Cui <decui@microsoft.com>
Acked-by: default avatarJiri Kosina <jkosina@suse.cz>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent 25bd2b2f

drivers/hid/hid-hyperv.c

+34 −0
Original line number Diff line number Diff line
@@ -192,6 +192,9 @@ static void mousevsc_on_receive_device_info(struct mousevsc_dev *input_device, 
	if (desc->bLength == 0)

		goto cleanup;



	/* The pointer is not NULL when we resume from hibernation */

	if (input_device->hid_desc != NULL)

		kfree(input_device->hid_desc);

	input_device->hid_desc = kmemdup(desc, desc->bLength, GFP_ATOMIC);



	if (!input_device->hid_desc)
@@ -203,6 +206,9 @@ static void mousevsc_on_receive_device_info(struct mousevsc_dev *input_device, 
		goto cleanup;

	}



	/* The pointer is not NULL when we resume from hibernation */

	if (input_device->report_desc != NULL)

		kfree(input_device->report_desc);

	input_device->report_desc = kzalloc(input_device->report_desc_size,

					  GFP_ATOMIC);
@@ -342,6 +348,8 @@ static int mousevsc_connect_to_vsp(struct hv_device *device) 
	struct mousevsc_prt_msg *request;

	struct mousevsc_prt_msg *response;



	reinit_completion(&input_dev->wait_event);



	request = &input_dev->protocol_req;

	memset(request, 0, sizeof(struct mousevsc_prt_msg));
@@ -541,6 +549,30 @@ static int mousevsc_remove(struct hv_device *dev) 
	return 0;

}



static int mousevsc_suspend(struct hv_device *dev)

{

	vmbus_close(dev->channel);



	return 0;

}



static int mousevsc_resume(struct hv_device *dev)

{

	int ret;



	ret = vmbus_open(dev->channel,

			 INPUTVSC_SEND_RING_BUFFER_SIZE,

			 INPUTVSC_RECV_RING_BUFFER_SIZE,

			 NULL, 0,

			 mousevsc_on_channel_callback,

			 dev);

	if (ret)

		return ret;



	ret = mousevsc_connect_to_vsp(dev);

	return ret;

}



static const struct hv_vmbus_device_id id_table[] = {

	/* Mouse guid */

	{ HV_MOUSE_GUID, },
@@ -554,6 +586,8 @@ static struct hv_driver mousevsc_drv = { 
	.id_table = id_table,

	.probe = mousevsc_probe,

	.remove = mousevsc_remove,

	.suspend = mousevsc_suspend,

	.resume = mousevsc_resume,

	.driver = {

		.probe_type = PROBE_PREFER_ASYNCHRONOUS,

	},

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