lkml.org 
[lkml]   [2019]   [Sep]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] Input: hyperv-keyboard: Add the support of hibernation
Date
We need hv_kbd_pm_notify() to make sure the pm_wakeup_hard_event() call
does not prevent the system from entering hibernation: the hibernation
is a relatively long process, which can be aborted by the call
pm_wakeup_hard_event(), which is invoked upon keyboard events.

Signed-off-by: Dexuan Cui <decui@microsoft.com>
---

This patch is basically a pure Hyper-V specific change and it has a
build dependency on the commit 271b2224d42f ("Drivers: hv: vmbus: Implement
suspend/resume for VSC drivers for hibernation"), which is on Sasha Levin's
Hyper-V tree's hyperv-next branch:
https://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux.git/log/?h=hyperv-next

I request this patch should go through Sasha's tree rather than the
input subsystemi's tree.

Hi Dmitry, can you please Ack?

drivers/input/serio/hyperv-keyboard.c | 68 ++++++++++++++++++++++++++++++++---
1 file changed, 63 insertions(+), 5 deletions(-)

diff --git a/drivers/input/serio/hyperv-keyboard.c b/drivers/input/serio/hyperv-keyboard.c
index 88ae7c2..277dc4c 100644
--- a/drivers/input/serio/hyperv-keyboard.c
+++ b/drivers/input/serio/hyperv-keyboard.c
@@ -10,6 +10,7 @@
#include <linux/hyperv.h>
#include <linux/serio.h>
#include <linux/slab.h>
+#include <linux/suspend.h>

/*
* Current version 1.0
@@ -95,6 +96,9 @@ struct hv_kbd_dev {
struct completion wait_event;
spinlock_t lock; /* protects 'started' field */
bool started;
+
+ struct notifier_block pm_nb;
+ bool hibernation_in_progress;
};

static void hv_kbd_on_receive(struct hv_device *hv_dev,
@@ -168,7 +172,7 @@ static void hv_kbd_on_receive(struct hv_device *hv_dev,
* "echo freeze > /sys/power/state" can't really enter the
* state because the Enter-UP can trigger a wakeup at once.
*/
- if (!(info & IS_BREAK))
+ if (!(info & IS_BREAK) && !kbd_dev->hibernation_in_progress)
pm_wakeup_hard_event(&hv_dev->device);

break;
@@ -179,10 +183,10 @@ static void hv_kbd_on_receive(struct hv_device *hv_dev,
}
}

-static void hv_kbd_handle_received_packet(struct hv_device *hv_dev,
- struct vmpacket_descriptor *desc,
- u32 bytes_recvd,
- u64 req_id)
+static void
+hv_kbd_handle_received_packet(struct hv_device *hv_dev,
+ const struct vmpacket_descriptor *desc,
+ u32 bytes_recvd, u64 req_id)
{
struct synth_kbd_msg *msg;
u32 msg_sz;
@@ -282,6 +286,8 @@ 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);
@@ -332,6 +338,29 @@ static void hv_kbd_stop(struct serio *serio)
spin_unlock_irqrestore(&kbd_dev->lock, flags);
}

+static int hv_kbd_pm_notify(struct notifier_block *nb,
+ unsigned long val, void *ign)
+{
+ struct hv_kbd_dev *kbd_dev;
+
+ kbd_dev = container_of(nb, struct hv_kbd_dev, pm_nb);
+
+ switch (val) {
+ case PM_HIBERNATION_PREPARE:
+ case PM_RESTORE_PREPARE:
+ kbd_dev->hibernation_in_progress = true;
+ return NOTIFY_OK;
+
+ case PM_POST_HIBERNATION:
+ case PM_POST_RESTORE:
+ kbd_dev->hibernation_in_progress = false;
+ return NOTIFY_OK;
+
+ default:
+ return NOTIFY_DONE;
+ }
+}
+
static int hv_kbd_probe(struct hv_device *hv_dev,
const struct hv_vmbus_device_id *dev_id)
{
@@ -380,6 +409,9 @@ static int hv_kbd_probe(struct hv_device *hv_dev,

device_init_wakeup(&hv_dev->device, true);

+ kbd_dev->pm_nb.notifier_call = hv_kbd_pm_notify;
+ register_pm_notifier(&kbd_dev->pm_nb);
+
return 0;

err_close_vmbus:
@@ -394,6 +426,7 @@ static int hv_kbd_remove(struct hv_device *hv_dev)
{
struct hv_kbd_dev *kbd_dev = hv_get_drvdata(hv_dev);

+ unregister_pm_notifier(&kbd_dev->pm_nb);
serio_unregister_port(kbd_dev->hv_serio);
vmbus_close(hv_dev->channel);
kfree(kbd_dev);
@@ -403,6 +436,29 @@ 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, },
@@ -416,6 +472,8 @@ static int hv_kbd_remove(struct hv_device *hv_dev)
.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,
},
--
1.8.3.1
\
 
 \ /
  Last update: 2019-09-12 01:36    [W:0.020 / U:7.468 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site