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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: Dexuan Cui <decui@microsoft.com>
Acked-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Dexuan Cui 2019-11-19 23:14:56 -08:00 committed by Sasha Levin
parent 25bd2b2f1f
commit af13f9ed6f
1 changed files with 34 additions and 0 deletions
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34
drivers/hid/hid-hyperv.c
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@ -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,
},