[PATCH 1/1] Staging: hv: mousevsc: Move the mouse driver out of staging

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In preparation for moving the mouse driver out of staging, seek community
review of the mouse driver code.

Signed-off-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx>
Signed-off-by: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>
---
 drivers/hid/Kconfig           |    6 +
 drivers/hid/Makefile          |    1 +
 drivers/hid/hv_mouse.c        |  599 +++++++++++++++++++++++++++++++++++++++++
 drivers/staging/hv/Kconfig    |    6 -
 drivers/staging/hv/Makefile   |    1 -
 drivers/staging/hv/hv_mouse.c |  599 -----------------------------------------
 6 files changed, 606 insertions(+), 606 deletions(-)
 create mode 100644 drivers/hid/hv_mouse.c
 delete mode 100644 drivers/staging/hv/hv_mouse.c

diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index 1130a89..f8b98b8 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -613,6 +613,12 @@ config HID_ZYDACRON
 	---help---
 	Support for Zydacron remote control.
 
+config HYPERV_MOUSE
+	tristate "Microsoft Hyper-V mouse driver"
+	depends on HYPERV
+	help
+	  Select this option to enable the Hyper-V mouse driver.
+
 endmenu
 
 endif # HID_SUPPORT
diff --git a/drivers/hid/Makefile b/drivers/hid/Makefile
index 0a0a38e..436ac2e 100644
--- a/drivers/hid/Makefile
+++ b/drivers/hid/Makefile
@@ -76,6 +76,7 @@ obj-$(CONFIG_HID_ZYDACRON)	+= hid-zydacron.o
 obj-$(CONFIG_HID_WACOM)		+= hid-wacom.o
 obj-$(CONFIG_HID_WALTOP)	+= hid-waltop.o
 obj-$(CONFIG_HID_WIIMOTE)	+= hid-wiimote.o
+obj-$(CONFIG_HYPERV_MOUSE)	+= hv_mouse.o
 
 obj-$(CONFIG_USB_HID)		+= usbhid/
 obj-$(CONFIG_USB_MOUSE)		+= usbhid/
diff --git a/drivers/hid/hv_mouse.c b/drivers/hid/hv_mouse.c
new file mode 100644
index 0000000..ccd39c7
--- /dev/null
+++ b/drivers/hid/hv_mouse.c
@@ -0,0 +1,599 @@
+/*
+ *  Copyright (c) 2009, Citrix Systems, Inc.
+ *  Copyright (c) 2010, Microsoft Corporation.
+ *  Copyright (c) 2011, Novell Inc.
+ *
+ *  This program is free software; you can redistribute it and/or modify it
+ *  under the terms and conditions of the GNU General Public License,
+ *  version 2, as published by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ *  more details.
+ */
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/workqueue.h>
+#include <linux/sched.h>
+#include <linux/wait.h>
+#include <linux/input.h>
+#include <linux/hid.h>
+#include <linux/hiddev.h>
+#include <linux/hyperv.h>
+
+
+struct hv_input_dev_info {
+	unsigned int size;
+	unsigned short vendor;
+	unsigned short product;
+	unsigned short version;
+	unsigned short reserved[11];
+};
+
+/* The maximum size of a synthetic input message. */
+#define SYNTHHID_MAX_INPUT_REPORT_SIZE 16
+
+/*
+ * Current version
+ *
+ * History:
+ * Beta, RC < 2008/1/22        1,0
+ * RC > 2008/1/22              2,0
+ */
+#define SYNTHHID_INPUT_VERSION_MAJOR	2
+#define SYNTHHID_INPUT_VERSION_MINOR	0
+#define SYNTHHID_INPUT_VERSION		(SYNTHHID_INPUT_VERSION_MINOR | \
+					 (SYNTHHID_INPUT_VERSION_MAJOR << 16))
+
+
+#pragma pack(push, 1)
+/*
+ * Message types in the synthetic input protocol
+ */
+enum synthhid_msg_type {
+	SYNTH_HID_PROTOCOL_REQUEST,
+	SYNTH_HID_PROTOCOL_RESPONSE,
+	SYNTH_HID_INITIAL_DEVICE_INFO,
+	SYNTH_HID_INITIAL_DEVICE_INFO_ACK,
+	SYNTH_HID_INPUT_REPORT,
+	SYNTH_HID_MAX
+};
+
+/*
+ * Basic message structures.
+ */
+struct synthhid_msg_hdr {
+	enum synthhid_msg_type type;
+	u32 size;
+};
+
+struct synthhid_msg {
+	struct synthhid_msg_hdr header;
+	char data[1]; /* Enclosed message */
+};
+
+union synthhid_version {
+	struct {
+		u16 minor_version;
+		u16 major_version;
+	};
+	u32 version;
+};
+
+/*
+ * Protocol messages
+ */
+struct synthhid_protocol_request {
+	struct synthhid_msg_hdr header;
+	union synthhid_version version_requested;
+};
+
+struct synthhid_protocol_response {
+	struct synthhid_msg_hdr header;
+	union synthhid_version version_requested;
+	unsigned char approved;
+};
+
+struct synthhid_device_info {
+	struct synthhid_msg_hdr header;
+	struct hv_input_dev_info hid_dev_info;
+	struct hid_descriptor hid_descriptor;
+};
+
+struct synthhid_device_info_ack {
+	struct synthhid_msg_hdr header;
+	unsigned char reserved;
+};
+
+struct synthhid_input_report {
+	struct synthhid_msg_hdr header;
+	char buffer[1];
+};
+
+#pragma pack(pop)
+
+#define INPUTVSC_SEND_RING_BUFFER_SIZE		(10*PAGE_SIZE)
+#define INPUTVSC_RECV_RING_BUFFER_SIZE		(10*PAGE_SIZE)
+
+#define NBITS(x) (((x)/BITS_PER_LONG)+1)
+
+enum pipe_prot_msg_type {
+	PIPE_MESSAGE_INVALID,
+	PIPE_MESSAGE_DATA,
+	PIPE_MESSAGE_MAXIMUM
+};
+
+
+struct pipe_prt_msg {
+	enum pipe_prot_msg_type type;
+	u32 size;
+	char data[1];
+};
+
+struct  mousevsc_prt_msg {
+	enum pipe_prot_msg_type type;
+	u32 size;
+	union {
+		struct synthhid_protocol_request request;
+		struct synthhid_protocol_response response;
+		struct synthhid_device_info_ack ack;
+	};
+};
+
+/*
+ * Represents an mousevsc device
+ */
+struct mousevsc_dev {
+	struct hv_device	*device;
+	unsigned char		init_complete;
+	struct mousevsc_prt_msg	protocol_req;
+	struct mousevsc_prt_msg	protocol_resp;
+	/* Synchronize the request/response if needed */
+	struct completion	wait_event;
+	int			dev_info_status;
+
+	struct hid_descriptor	*hid_desc;
+	unsigned char		*report_desc;
+	u32			report_desc_size;
+	struct hv_input_dev_info hid_dev_info;
+	int			connected;
+	struct hid_device       *hid_device;
+};
+
+
+static struct mousevsc_dev *alloc_input_device(struct hv_device *device)
+{
+	struct mousevsc_dev *input_dev;
+
+	input_dev = kzalloc(sizeof(struct mousevsc_dev), GFP_KERNEL);
+
+	if (!input_dev)
+		return NULL;
+
+	input_dev->device = device;
+	hv_set_drvdata(device, input_dev);
+	init_completion(&input_dev->wait_event);
+
+	return input_dev;
+}
+
+static void free_input_device(struct mousevsc_dev *device)
+{
+	kfree(device->hid_desc);
+	kfree(device->report_desc);
+	hv_set_drvdata(device->device, NULL);
+	kfree(device);
+}
+
+
+static void mousevsc_on_receive_device_info(struct mousevsc_dev *input_device,
+				struct synthhid_device_info *device_info)
+{
+	int ret = 0;
+	struct hid_descriptor *desc;
+	struct mousevsc_prt_msg ack;
+
+	/* Assume success for now */
+	input_device->dev_info_status = 0;
+
+	memcpy(&input_device->hid_dev_info, &device_info->hid_dev_info,
+		sizeof(struct hv_input_dev_info));
+
+	desc = &device_info->hid_descriptor;
+	WARN_ON(desc->bLength == 0);
+
+	input_device->hid_desc = kzalloc(desc->bLength, GFP_ATOMIC);
+
+	if (!input_device->hid_desc)
+		goto cleanup;
+
+	memcpy(input_device->hid_desc, desc, desc->bLength);
+
+	input_device->report_desc_size = desc->desc[0].wDescriptorLength;
+	if (input_device->report_desc_size == 0)
+		goto cleanup;
+	input_device->report_desc = kzalloc(input_device->report_desc_size,
+					  GFP_ATOMIC);
+
+	if (!input_device->report_desc)
+		goto cleanup;
+
+	memcpy(input_device->report_desc,
+	       ((unsigned char *)desc) + desc->bLength,
+	       desc->desc[0].wDescriptorLength);
+
+	/* Send the ack */
+	memset(&ack, 0, sizeof(struct mousevsc_prt_msg));
+
+	ack.type = PIPE_MESSAGE_DATA;
+	ack.size = sizeof(struct synthhid_device_info_ack);
+
+	ack.ack.header.type = SYNTH_HID_INITIAL_DEVICE_INFO_ACK;
+	ack.ack.header.size = 1;
+	ack.ack.reserved = 0;
+
+	ret = vmbus_sendpacket(input_device->device->channel,
+			&ack,
+			sizeof(struct pipe_prt_msg) - sizeof(unsigned char) +
+			sizeof(struct synthhid_device_info_ack),
+			(unsigned long)&ack,
+			VM_PKT_DATA_INBAND,
+			VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
+	if (ret != 0)
+		goto cleanup;
+
+	complete(&input_device->wait_event);
+
+	return;
+
+cleanup:
+	kfree(input_device->hid_desc);
+	input_device->hid_desc = NULL;
+
+	kfree(input_device->report_desc);
+	input_device->report_desc = NULL;
+
+	input_device->dev_info_status = -1;
+	complete(&input_device->wait_event);
+}
+
+static void mousevsc_on_receive(struct hv_device *device,
+				struct vmpacket_descriptor *packet)
+{
+	struct pipe_prt_msg *pipe_msg;
+	struct synthhid_msg *hid_msg;
+	struct mousevsc_dev *input_dev = hv_get_drvdata(device);
+	struct synthhid_input_report *input_report;
+
+	pipe_msg = (struct pipe_prt_msg *)((unsigned long)packet +
+						(packet->offset8 << 3));
+
+	if (pipe_msg->type != PIPE_MESSAGE_DATA)
+		return;
+
+	hid_msg = (struct synthhid_msg *)&pipe_msg->data[0];
+
+	switch (hid_msg->header.type) {
+	case SYNTH_HID_PROTOCOL_RESPONSE:
+		memcpy(&input_dev->protocol_resp, pipe_msg,
+		       pipe_msg->size + sizeof(struct pipe_prt_msg) -
+		       sizeof(unsigned char));
+		complete(&input_dev->wait_event);
+		break;
+
+	case SYNTH_HID_INITIAL_DEVICE_INFO:
+		WARN_ON(pipe_msg->size < sizeof(struct hv_input_dev_info));
+
+		/*
+		 * Parse out the device info into device attr,
+		 * hid desc and report desc
+		 */
+		mousevsc_on_receive_device_info(input_dev,
+			(struct synthhid_device_info *)&pipe_msg->data[0]);
+		break;
+	case SYNTH_HID_INPUT_REPORT:
+		input_report =
+			(struct synthhid_input_report *)&pipe_msg->data[0];
+		if (!input_dev->init_complete)
+			break;
+		hid_input_report(input_dev->hid_device,
+				HID_INPUT_REPORT, input_report->buffer,
+				input_report->header.size, 1);
+		break;
+	default:
+		pr_err("unsupported hid msg type - type %d len %d",
+		       hid_msg->header.type, hid_msg->header.size);
+		break;
+	}
+
+}
+
+static void mousevsc_on_channel_callback(void *context)
+{
+	const int packetSize = 0x100;
+	int ret = 0;
+	struct hv_device *device = (struct hv_device *)context;
+
+	u32 bytes_recvd;
+	u64 req_id;
+	unsigned char packet[0x100];
+	struct vmpacket_descriptor *desc;
+	unsigned char	*buffer = packet;
+	int	bufferlen = packetSize;
+
+
+	do {
+		ret = vmbus_recvpacket_raw(device->channel, buffer,
+					bufferlen, &bytes_recvd, &req_id);
+
+		if (ret == 0) {
+			if (bytes_recvd > 0) {
+				desc = (struct vmpacket_descriptor *)buffer;
+
+				switch (desc->type) {
+				case VM_PKT_COMP:
+					break;
+
+				case VM_PKT_DATA_INBAND:
+					mousevsc_on_receive(
+						device, desc);
+					break;
+
+				default:
+					pr_err("unhandled packet type %d, tid %llx len %d\n",
+						   desc->type,
+						   req_id,
+						   bytes_recvd);
+					break;
+				}
+
+				/* reset */
+				if (bufferlen > packetSize) {
+					kfree(buffer);
+
+					buffer = packet;
+					bufferlen = packetSize;
+				}
+			} else {
+				if (bufferlen > packetSize) {
+					kfree(buffer);
+
+					buffer = packet;
+					bufferlen = packetSize;
+				}
+				break;
+			}
+		} else if (ret == -ENOBUFS) {
+			/* Handle large packet */
+			bufferlen = bytes_recvd;
+			buffer = kzalloc(bytes_recvd, GFP_ATOMIC);
+
+			if (buffer == NULL) {
+				buffer = packet;
+				bufferlen = packetSize;
+				break;
+			}
+		}
+	} while (1);
+
+	return;
+}
+
+static int mousevsc_connect_to_vsp(struct hv_device *device)
+{
+	int ret = 0;
+	int t;
+	struct mousevsc_dev *input_dev = hv_get_drvdata(device);
+	struct mousevsc_prt_msg *request;
+	struct mousevsc_prt_msg *response;
+
+
+	request = &input_dev->protocol_req;
+
+	memset(request, 0, sizeof(struct mousevsc_prt_msg));
+
+	request->type = PIPE_MESSAGE_DATA;
+	request->size = sizeof(struct synthhid_protocol_request);
+
+	request->request.header.type = SYNTH_HID_PROTOCOL_REQUEST;
+	request->request.header.size = sizeof(unsigned int);
+	request->request.version_requested.version = SYNTHHID_INPUT_VERSION;
+
+
+	ret = vmbus_sendpacket(device->channel, request,
+				sizeof(struct pipe_prt_msg) -
+				sizeof(unsigned char) +
+				sizeof(struct synthhid_protocol_request),
+				(unsigned long)request,
+				VM_PKT_DATA_INBAND,
+				VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
+	if (ret != 0)
+		goto cleanup;
+
+	t = wait_for_completion_timeout(&input_dev->wait_event, 5*HZ);
+	if (t == 0) {
+		ret = -ETIMEDOUT;
+		goto cleanup;
+	}
+
+	response = &input_dev->protocol_resp;
+
+	if (!response->response.approved) {
+		pr_err("synthhid protocol request failed (version %d)",
+		       SYNTHHID_INPUT_VERSION);
+		ret = -ENODEV;
+		goto cleanup;
+	}
+
+	t = wait_for_completion_timeout(&input_dev->wait_event, 5*HZ);
+	if (t == 0) {
+		ret = -ETIMEDOUT;
+		goto cleanup;
+	}
+
+	/*
+	 * We should have gotten the device attr, hid desc and report
+	 * desc at this point
+	 */
+	if (input_dev->dev_info_status)
+		ret = -ENOMEM;
+
+cleanup:
+
+	return ret;
+}
+
+static int mousevsc_hid_open(struct hid_device *hid)
+{
+	return 0;
+}
+
+static void mousevsc_hid_close(struct hid_device *hid)
+{
+}
+
+static struct hid_ll_driver mousevsc_ll_driver = {
+	.open = mousevsc_hid_open,
+	.close = mousevsc_hid_close,
+};
+
+static struct hid_driver mousevsc_hid_driver;
+
+static void reportdesc_callback(struct hv_device *dev, void *packet, u32 len)
+{
+	struct hid_device *hid_dev;
+	struct mousevsc_dev *input_device = hv_get_drvdata(dev);
+
+	hid_dev = hid_allocate_device();
+	if (IS_ERR(hid_dev))
+		return;
+
+	hid_dev->ll_driver = &mousevsc_ll_driver;
+	hid_dev->driver = &mousevsc_hid_driver;
+
+	if (hid_parse_report(hid_dev, packet, len))
+		return;
+
+	hid_dev->bus = BUS_VIRTUAL;
+	hid_dev->vendor = input_device->hid_dev_info.vendor;
+	hid_dev->product = input_device->hid_dev_info.product;
+	hid_dev->version = input_device->hid_dev_info.version;
+
+	sprintf(hid_dev->name, "%s", "Microsoft Vmbus HID-compliant Mouse");
+
+	if (!hidinput_connect(hid_dev, 0)) {
+		hid_dev->claimed |= HID_CLAIMED_INPUT;
+
+		input_device->connected = 1;
+
+	}
+
+	input_device->hid_device = hid_dev;
+}
+
+static int mousevsc_on_device_add(struct hv_device *device)
+{
+	int ret = 0;
+	struct mousevsc_dev *input_dev;
+
+	input_dev = alloc_input_device(device);
+
+	if (!input_dev)
+		return -ENOMEM;
+
+	input_dev->init_complete = false;
+
+	ret = vmbus_open(device->channel,
+		INPUTVSC_SEND_RING_BUFFER_SIZE,
+		INPUTVSC_RECV_RING_BUFFER_SIZE,
+		NULL,
+		0,
+		mousevsc_on_channel_callback,
+		device
+		);
+
+	if (ret != 0) {
+		free_input_device(input_dev);
+		return ret;
+	}
+
+
+	ret = mousevsc_connect_to_vsp(device);
+
+	if (ret != 0) {
+		vmbus_close(device->channel);
+		free_input_device(input_dev);
+		return ret;
+	}
+
+
+	/* workaround SA-167 */
+	if (input_dev->report_desc[14] == 0x25)
+		input_dev->report_desc[14] = 0x29;
+
+	reportdesc_callback(device, input_dev->report_desc,
+			    input_dev->report_desc_size);
+
+	input_dev->init_complete = true;
+
+	return ret;
+}
+
+static int mousevsc_probe(struct hv_device *dev,
+			const struct hv_vmbus_device_id *dev_id)
+{
+
+	return mousevsc_on_device_add(dev);
+
+}
+
+static int mousevsc_remove(struct hv_device *dev)
+{
+	struct mousevsc_dev *input_dev = hv_get_drvdata(dev);
+
+	vmbus_close(dev->channel);
+
+	if (input_dev->connected) {
+		hidinput_disconnect(input_dev->hid_device);
+		input_dev->connected = 0;
+		hid_destroy_device(input_dev->hid_device);
+	}
+
+	free_input_device(input_dev);
+
+	return 0;
+}
+
+static const struct hv_vmbus_device_id id_table[] = {
+	/* Mouse guid */
+	{ VMBUS_DEVICE(0x9E, 0xB6, 0xA8, 0xCF, 0x4A, 0x5B, 0xc0, 0x4c,
+		       0xB9, 0x8B, 0x8B, 0xA1, 0xA1, 0xF3, 0xF9, 0x5A) },
+	{ },
+};
+
+MODULE_DEVICE_TABLE(vmbus, id_table);
+
+static struct  hv_driver mousevsc_drv = {
+	.name = "mousevsc",
+	.id_table = id_table,
+	.probe = mousevsc_probe,
+	.remove = mousevsc_remove,
+};
+
+static int __init mousevsc_init(void)
+{
+	return vmbus_driver_register(&mousevsc_drv);
+}
+
+static void __exit mousevsc_exit(void)
+{
+	vmbus_driver_unregister(&mousevsc_drv);
+}
+
+MODULE_LICENSE("GPL");
+MODULE_VERSION(HV_DRV_VERSION);
+module_init(mousevsc_init);
+module_exit(mousevsc_exit);
diff --git a/drivers/staging/hv/Kconfig b/drivers/staging/hv/Kconfig
index 072185e..6c0dc30 100644
--- a/drivers/staging/hv/Kconfig
+++ b/drivers/staging/hv/Kconfig
@@ -9,9 +9,3 @@ config HYPERV_NET
 	depends on HYPERV && NET
 	help
 	  Select this option to enable the Hyper-V virtual network driver.
-
-config HYPERV_MOUSE
-	tristate "Microsoft Hyper-V mouse driver"
-	depends on HYPERV && HID
-	help
-	  Select this option to enable the Hyper-V mouse driver.
diff --git a/drivers/staging/hv/Makefile b/drivers/staging/hv/Makefile
index e071c12..3a2751e 100644
--- a/drivers/staging/hv/Makefile
+++ b/drivers/staging/hv/Makefile
@@ -1,7 +1,6 @@
 obj-$(CONFIG_HYPERV)		+= hv_timesource.o
 obj-$(CONFIG_HYPERV_STORAGE)	+= hv_storvsc.o
 obj-$(CONFIG_HYPERV_NET)	+= hv_netvsc.o
-obj-$(CONFIG_HYPERV_MOUSE)	+= hv_mouse.o
 
 hv_storvsc-y := storvsc_drv.o
 hv_netvsc-y := netvsc_drv.o netvsc.o rndis_filter.o
diff --git a/drivers/staging/hv/hv_mouse.c b/drivers/staging/hv/hv_mouse.c
deleted file mode 100644
index ccd39c7..0000000
--- a/drivers/staging/hv/hv_mouse.c
+++ /dev/null
@@ -1,599 +0,0 @@
-/*
- *  Copyright (c) 2009, Citrix Systems, Inc.
- *  Copyright (c) 2010, Microsoft Corporation.
- *  Copyright (c) 2011, Novell Inc.
- *
- *  This program is free software; you can redistribute it and/or modify it
- *  under the terms and conditions of the GNU General Public License,
- *  version 2, as published by the Free Software Foundation.
- *
- *  This program is distributed in the hope it will be useful, but WITHOUT
- *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- *  more details.
- */
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/delay.h>
-#include <linux/device.h>
-#include <linux/workqueue.h>
-#include <linux/sched.h>
-#include <linux/wait.h>
-#include <linux/input.h>
-#include <linux/hid.h>
-#include <linux/hiddev.h>
-#include <linux/hyperv.h>
-
-
-struct hv_input_dev_info {
-	unsigned int size;
-	unsigned short vendor;
-	unsigned short product;
-	unsigned short version;
-	unsigned short reserved[11];
-};
-
-/* The maximum size of a synthetic input message. */
-#define SYNTHHID_MAX_INPUT_REPORT_SIZE 16
-
-/*
- * Current version
- *
- * History:
- * Beta, RC < 2008/1/22        1,0
- * RC > 2008/1/22              2,0
- */
-#define SYNTHHID_INPUT_VERSION_MAJOR	2
-#define SYNTHHID_INPUT_VERSION_MINOR	0
-#define SYNTHHID_INPUT_VERSION		(SYNTHHID_INPUT_VERSION_MINOR | \
-					 (SYNTHHID_INPUT_VERSION_MAJOR << 16))
-
-
-#pragma pack(push, 1)
-/*
- * Message types in the synthetic input protocol
- */
-enum synthhid_msg_type {
-	SYNTH_HID_PROTOCOL_REQUEST,
-	SYNTH_HID_PROTOCOL_RESPONSE,
-	SYNTH_HID_INITIAL_DEVICE_INFO,
-	SYNTH_HID_INITIAL_DEVICE_INFO_ACK,
-	SYNTH_HID_INPUT_REPORT,
-	SYNTH_HID_MAX
-};
-
-/*
- * Basic message structures.
- */
-struct synthhid_msg_hdr {
-	enum synthhid_msg_type type;
-	u32 size;
-};
-
-struct synthhid_msg {
-	struct synthhid_msg_hdr header;
-	char data[1]; /* Enclosed message */
-};
-
-union synthhid_version {
-	struct {
-		u16 minor_version;
-		u16 major_version;
-	};
-	u32 version;
-};
-
-/*
- * Protocol messages
- */
-struct synthhid_protocol_request {
-	struct synthhid_msg_hdr header;
-	union synthhid_version version_requested;
-};
-
-struct synthhid_protocol_response {
-	struct synthhid_msg_hdr header;
-	union synthhid_version version_requested;
-	unsigned char approved;
-};
-
-struct synthhid_device_info {
-	struct synthhid_msg_hdr header;
-	struct hv_input_dev_info hid_dev_info;
-	struct hid_descriptor hid_descriptor;
-};
-
-struct synthhid_device_info_ack {
-	struct synthhid_msg_hdr header;
-	unsigned char reserved;
-};
-
-struct synthhid_input_report {
-	struct synthhid_msg_hdr header;
-	char buffer[1];
-};
-
-#pragma pack(pop)
-
-#define INPUTVSC_SEND_RING_BUFFER_SIZE		(10*PAGE_SIZE)
-#define INPUTVSC_RECV_RING_BUFFER_SIZE		(10*PAGE_SIZE)
-
-#define NBITS(x) (((x)/BITS_PER_LONG)+1)
-
-enum pipe_prot_msg_type {
-	PIPE_MESSAGE_INVALID,
-	PIPE_MESSAGE_DATA,
-	PIPE_MESSAGE_MAXIMUM
-};
-
-
-struct pipe_prt_msg {
-	enum pipe_prot_msg_type type;
-	u32 size;
-	char data[1];
-};
-
-struct  mousevsc_prt_msg {
-	enum pipe_prot_msg_type type;
-	u32 size;
-	union {
-		struct synthhid_protocol_request request;
-		struct synthhid_protocol_response response;
-		struct synthhid_device_info_ack ack;
-	};
-};
-
-/*
- * Represents an mousevsc device
- */
-struct mousevsc_dev {
-	struct hv_device	*device;
-	unsigned char		init_complete;
-	struct mousevsc_prt_msg	protocol_req;
-	struct mousevsc_prt_msg	protocol_resp;
-	/* Synchronize the request/response if needed */
-	struct completion	wait_event;
-	int			dev_info_status;
-
-	struct hid_descriptor	*hid_desc;
-	unsigned char		*report_desc;
-	u32			report_desc_size;
-	struct hv_input_dev_info hid_dev_info;
-	int			connected;
-	struct hid_device       *hid_device;
-};
-
-
-static struct mousevsc_dev *alloc_input_device(struct hv_device *device)
-{
-	struct mousevsc_dev *input_dev;
-
-	input_dev = kzalloc(sizeof(struct mousevsc_dev), GFP_KERNEL);
-
-	if (!input_dev)
-		return NULL;
-
-	input_dev->device = device;
-	hv_set_drvdata(device, input_dev);
-	init_completion(&input_dev->wait_event);
-
-	return input_dev;
-}
-
-static void free_input_device(struct mousevsc_dev *device)
-{
-	kfree(device->hid_desc);
-	kfree(device->report_desc);
-	hv_set_drvdata(device->device, NULL);
-	kfree(device);
-}
-
-
-static void mousevsc_on_receive_device_info(struct mousevsc_dev *input_device,
-				struct synthhid_device_info *device_info)
-{
-	int ret = 0;
-	struct hid_descriptor *desc;
-	struct mousevsc_prt_msg ack;
-
-	/* Assume success for now */
-	input_device->dev_info_status = 0;
-
-	memcpy(&input_device->hid_dev_info, &device_info->hid_dev_info,
-		sizeof(struct hv_input_dev_info));
-
-	desc = &device_info->hid_descriptor;
-	WARN_ON(desc->bLength == 0);
-
-	input_device->hid_desc = kzalloc(desc->bLength, GFP_ATOMIC);
-
-	if (!input_device->hid_desc)
-		goto cleanup;
-
-	memcpy(input_device->hid_desc, desc, desc->bLength);
-
-	input_device->report_desc_size = desc->desc[0].wDescriptorLength;
-	if (input_device->report_desc_size == 0)
-		goto cleanup;
-	input_device->report_desc = kzalloc(input_device->report_desc_size,
-					  GFP_ATOMIC);
-
-	if (!input_device->report_desc)
-		goto cleanup;
-
-	memcpy(input_device->report_desc,
-	       ((unsigned char *)desc) + desc->bLength,
-	       desc->desc[0].wDescriptorLength);
-
-	/* Send the ack */
-	memset(&ack, 0, sizeof(struct mousevsc_prt_msg));
-
-	ack.type = PIPE_MESSAGE_DATA;
-	ack.size = sizeof(struct synthhid_device_info_ack);
-
-	ack.ack.header.type = SYNTH_HID_INITIAL_DEVICE_INFO_ACK;
-	ack.ack.header.size = 1;
-	ack.ack.reserved = 0;
-
-	ret = vmbus_sendpacket(input_device->device->channel,
-			&ack,
-			sizeof(struct pipe_prt_msg) - sizeof(unsigned char) +
-			sizeof(struct synthhid_device_info_ack),
-			(unsigned long)&ack,
-			VM_PKT_DATA_INBAND,
-			VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
-	if (ret != 0)
-		goto cleanup;
-
-	complete(&input_device->wait_event);
-
-	return;
-
-cleanup:
-	kfree(input_device->hid_desc);
-	input_device->hid_desc = NULL;
-
-	kfree(input_device->report_desc);
-	input_device->report_desc = NULL;
-
-	input_device->dev_info_status = -1;
-	complete(&input_device->wait_event);
-}
-
-static void mousevsc_on_receive(struct hv_device *device,
-				struct vmpacket_descriptor *packet)
-{
-	struct pipe_prt_msg *pipe_msg;
-	struct synthhid_msg *hid_msg;
-	struct mousevsc_dev *input_dev = hv_get_drvdata(device);
-	struct synthhid_input_report *input_report;
-
-	pipe_msg = (struct pipe_prt_msg *)((unsigned long)packet +
-						(packet->offset8 << 3));
-
-	if (pipe_msg->type != PIPE_MESSAGE_DATA)
-		return;
-
-	hid_msg = (struct synthhid_msg *)&pipe_msg->data[0];
-
-	switch (hid_msg->header.type) {
-	case SYNTH_HID_PROTOCOL_RESPONSE:
-		memcpy(&input_dev->protocol_resp, pipe_msg,
-		       pipe_msg->size + sizeof(struct pipe_prt_msg) -
-		       sizeof(unsigned char));
-		complete(&input_dev->wait_event);
-		break;
-
-	case SYNTH_HID_INITIAL_DEVICE_INFO:
-		WARN_ON(pipe_msg->size < sizeof(struct hv_input_dev_info));
-
-		/*
-		 * Parse out the device info into device attr,
-		 * hid desc and report desc
-		 */
-		mousevsc_on_receive_device_info(input_dev,
-			(struct synthhid_device_info *)&pipe_msg->data[0]);
-		break;
-	case SYNTH_HID_INPUT_REPORT:
-		input_report =
-			(struct synthhid_input_report *)&pipe_msg->data[0];
-		if (!input_dev->init_complete)
-			break;
-		hid_input_report(input_dev->hid_device,
-				HID_INPUT_REPORT, input_report->buffer,
-				input_report->header.size, 1);
-		break;
-	default:
-		pr_err("unsupported hid msg type - type %d len %d",
-		       hid_msg->header.type, hid_msg->header.size);
-		break;
-	}
-
-}
-
-static void mousevsc_on_channel_callback(void *context)
-{
-	const int packetSize = 0x100;
-	int ret = 0;
-	struct hv_device *device = (struct hv_device *)context;
-
-	u32 bytes_recvd;
-	u64 req_id;
-	unsigned char packet[0x100];
-	struct vmpacket_descriptor *desc;
-	unsigned char	*buffer = packet;
-	int	bufferlen = packetSize;
-
-
-	do {
-		ret = vmbus_recvpacket_raw(device->channel, buffer,
-					bufferlen, &bytes_recvd, &req_id);
-
-		if (ret == 0) {
-			if (bytes_recvd > 0) {
-				desc = (struct vmpacket_descriptor *)buffer;
-
-				switch (desc->type) {
-				case VM_PKT_COMP:
-					break;
-
-				case VM_PKT_DATA_INBAND:
-					mousevsc_on_receive(
-						device, desc);
-					break;
-
-				default:
-					pr_err("unhandled packet type %d, tid %llx len %d\n",
-						   desc->type,
-						   req_id,
-						   bytes_recvd);
-					break;
-				}
-
-				/* reset */
-				if (bufferlen > packetSize) {
-					kfree(buffer);
-
-					buffer = packet;
-					bufferlen = packetSize;
-				}
-			} else {
-				if (bufferlen > packetSize) {
-					kfree(buffer);
-
-					buffer = packet;
-					bufferlen = packetSize;
-				}
-				break;
-			}
-		} else if (ret == -ENOBUFS) {
-			/* Handle large packet */
-			bufferlen = bytes_recvd;
-			buffer = kzalloc(bytes_recvd, GFP_ATOMIC);
-
-			if (buffer == NULL) {
-				buffer = packet;
-				bufferlen = packetSize;
-				break;
-			}
-		}
-	} while (1);
-
-	return;
-}
-
-static int mousevsc_connect_to_vsp(struct hv_device *device)
-{
-	int ret = 0;
-	int t;
-	struct mousevsc_dev *input_dev = hv_get_drvdata(device);
-	struct mousevsc_prt_msg *request;
-	struct mousevsc_prt_msg *response;
-
-
-	request = &input_dev->protocol_req;
-
-	memset(request, 0, sizeof(struct mousevsc_prt_msg));
-
-	request->type = PIPE_MESSAGE_DATA;
-	request->size = sizeof(struct synthhid_protocol_request);
-
-	request->request.header.type = SYNTH_HID_PROTOCOL_REQUEST;
-	request->request.header.size = sizeof(unsigned int);
-	request->request.version_requested.version = SYNTHHID_INPUT_VERSION;
-
-
-	ret = vmbus_sendpacket(device->channel, request,
-				sizeof(struct pipe_prt_msg) -
-				sizeof(unsigned char) +
-				sizeof(struct synthhid_protocol_request),
-				(unsigned long)request,
-				VM_PKT_DATA_INBAND,
-				VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
-	if (ret != 0)
-		goto cleanup;
-
-	t = wait_for_completion_timeout(&input_dev->wait_event, 5*HZ);
-	if (t == 0) {
-		ret = -ETIMEDOUT;
-		goto cleanup;
-	}
-
-	response = &input_dev->protocol_resp;
-
-	if (!response->response.approved) {
-		pr_err("synthhid protocol request failed (version %d)",
-		       SYNTHHID_INPUT_VERSION);
-		ret = -ENODEV;
-		goto cleanup;
-	}
-
-	t = wait_for_completion_timeout(&input_dev->wait_event, 5*HZ);
-	if (t == 0) {
-		ret = -ETIMEDOUT;
-		goto cleanup;
-	}
-
-	/*
-	 * We should have gotten the device attr, hid desc and report
-	 * desc at this point
-	 */
-	if (input_dev->dev_info_status)
-		ret = -ENOMEM;
-
-cleanup:
-
-	return ret;
-}
-
-static int mousevsc_hid_open(struct hid_device *hid)
-{
-	return 0;
-}
-
-static void mousevsc_hid_close(struct hid_device *hid)
-{
-}
-
-static struct hid_ll_driver mousevsc_ll_driver = {
-	.open = mousevsc_hid_open,
-	.close = mousevsc_hid_close,
-};
-
-static struct hid_driver mousevsc_hid_driver;
-
-static void reportdesc_callback(struct hv_device *dev, void *packet, u32 len)
-{
-	struct hid_device *hid_dev;
-	struct mousevsc_dev *input_device = hv_get_drvdata(dev);
-
-	hid_dev = hid_allocate_device();
-	if (IS_ERR(hid_dev))
-		return;
-
-	hid_dev->ll_driver = &mousevsc_ll_driver;
-	hid_dev->driver = &mousevsc_hid_driver;
-
-	if (hid_parse_report(hid_dev, packet, len))
-		return;
-
-	hid_dev->bus = BUS_VIRTUAL;
-	hid_dev->vendor = input_device->hid_dev_info.vendor;
-	hid_dev->product = input_device->hid_dev_info.product;
-	hid_dev->version = input_device->hid_dev_info.version;
-
-	sprintf(hid_dev->name, "%s", "Microsoft Vmbus HID-compliant Mouse");
-
-	if (!hidinput_connect(hid_dev, 0)) {
-		hid_dev->claimed |= HID_CLAIMED_INPUT;
-
-		input_device->connected = 1;
-
-	}
-
-	input_device->hid_device = hid_dev;
-}
-
-static int mousevsc_on_device_add(struct hv_device *device)
-{
-	int ret = 0;
-	struct mousevsc_dev *input_dev;
-
-	input_dev = alloc_input_device(device);
-
-	if (!input_dev)
-		return -ENOMEM;
-
-	input_dev->init_complete = false;
-
-	ret = vmbus_open(device->channel,
-		INPUTVSC_SEND_RING_BUFFER_SIZE,
-		INPUTVSC_RECV_RING_BUFFER_SIZE,
-		NULL,
-		0,
-		mousevsc_on_channel_callback,
-		device
-		);
-
-	if (ret != 0) {
-		free_input_device(input_dev);
-		return ret;
-	}
-
-
-	ret = mousevsc_connect_to_vsp(device);
-
-	if (ret != 0) {
-		vmbus_close(device->channel);
-		free_input_device(input_dev);
-		return ret;
-	}
-
-
-	/* workaround SA-167 */
-	if (input_dev->report_desc[14] == 0x25)
-		input_dev->report_desc[14] = 0x29;
-
-	reportdesc_callback(device, input_dev->report_desc,
-			    input_dev->report_desc_size);
-
-	input_dev->init_complete = true;
-
-	return ret;
-}
-
-static int mousevsc_probe(struct hv_device *dev,
-			const struct hv_vmbus_device_id *dev_id)
-{
-
-	return mousevsc_on_device_add(dev);
-
-}
-
-static int mousevsc_remove(struct hv_device *dev)
-{
-	struct mousevsc_dev *input_dev = hv_get_drvdata(dev);
-
-	vmbus_close(dev->channel);
-
-	if (input_dev->connected) {
-		hidinput_disconnect(input_dev->hid_device);
-		input_dev->connected = 0;
-		hid_destroy_device(input_dev->hid_device);
-	}
-
-	free_input_device(input_dev);
-
-	return 0;
-}
-
-static const struct hv_vmbus_device_id id_table[] = {
-	/* Mouse guid */
-	{ VMBUS_DEVICE(0x9E, 0xB6, 0xA8, 0xCF, 0x4A, 0x5B, 0xc0, 0x4c,
-		       0xB9, 0x8B, 0x8B, 0xA1, 0xA1, 0xF3, 0xF9, 0x5A) },
-	{ },
-};
-
-MODULE_DEVICE_TABLE(vmbus, id_table);
-
-static struct  hv_driver mousevsc_drv = {
-	.name = "mousevsc",
-	.id_table = id_table,
-	.probe = mousevsc_probe,
-	.remove = mousevsc_remove,
-};
-
-static int __init mousevsc_init(void)
-{
-	return vmbus_driver_register(&mousevsc_drv);
-}
-
-static void __exit mousevsc_exit(void)
-{
-	vmbus_driver_unregister(&mousevsc_drv);
-}
-
-MODULE_LICENSE("GPL");
-MODULE_VERSION(HV_DRV_VERSION);
-module_init(mousevsc_init);
-module_exit(mousevsc_exit);
-- 
1.7.4.1

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