From e2379b30324ca5ba808f16cb3d2504349264912f Mon Sep 17 00:00:00 2001 From: Dexuan Cui Date: Mon, 6 Jan 2020 14:40:44 -0800 Subject: 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: Michael Kelley Signed-off-by: Dexuan Cui Signed-off-by: Sasha Levin --- drivers/input/serio/hyperv-keyboard.c | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) (limited to 'drivers/input') diff --git a/drivers/input/serio/hyperv-keyboard.c b/drivers/input/serio/hyperv-keyboard.c index e486a8a74c40..df4e9f6f4529 100644 --- a/drivers/input/serio/hyperv-keyboard.c +++ b/drivers/input/serio/hyperv-keyboard.c @@ -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, }, -- cgit v1.2.3-59-g8ed1b