hv_mouse.c - Android社区 - https://www.androidos.net.cn/

Kernel | 2.6.39

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/*
 *  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/pci.h>
#include <linux/dmi.h>
#include <linux/delay.h>

#include "hv_api.h"
#include "logging.h"
#include "version_info.h"
#include "vmbus.h"
#include "vmbus_api.h"
#include "channel.h"
#include "vmbus_packet_format.h"

/*
 * Data types
 */
struct hv_input_dev_info {
	unsigned short vendor;
	unsigned short product;
	unsigned short version;
	char name[128];
};

/* Represents the input vsc driver */
/* FIXME - can be removed entirely */
struct mousevsc_drv_obj {
	struct hv_driver Base;
};

/* 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 {
	SynthHidProtocolRequest,
	SynthHidProtocolResponse,
	SynthHidInitialDeviceInfo,
	SynthHidInitialDeviceInfoAck,
	SynthHidInputReport,
	SynthHidMax
};

/*
 * 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 {
	PipeMessageInvalid = 0,
	PipeMessageData,
	PipeMessageMaximum
};

struct pipe_prt_msg {
	enum pipe_prot_msg_type type;
	u32 size;
	char data[1];
};

/*
 * Data types
 */
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;
	/* 0 indicates the device is being destroyed */
	atomic_t		RefCount;
	int			NumOutstandingRequests;
	unsigned char		bInitializeComplete;
	struct mousevsc_prt_msg	ProtocolReq;
	struct mousevsc_prt_msg	ProtocolResp;
	/* Synchronize the request/response if needed */
	wait_queue_head_t	ProtocolWaitEvent;
	wait_queue_head_t	DeviceInfoWaitEvent;
	int			protocol_wait_condition;
	int			device_wait_condition;
	int			DeviceInfoStatus;

struct hid_descriptor	*HidDesc;
	unsigned char		*ReportDesc;
	u32			ReportDescSize;
	struct hv_input_dev_info hid_dev_info;
};

static const char *driver_name = "mousevsc";

/* {CFA8B69E-5B4A-4cc0-B98B-8BA1A1F3F95A} */
static const struct hv_guid mouse_guid = {
	.data = {0x9E, 0xB6, 0xA8, 0xCF, 0x4A, 0x5B, 0xc0, 0x4c,
		 0xB9, 0x8B, 0x8B, 0xA1, 0xA1, 0xF3, 0xF9, 0x5A}
};

static void deviceinfo_callback(struct hv_device *dev, struct hv_input_dev_info *info);
static void inputreport_callback(struct hv_device *dev, void *packet, u32 len);
static void reportdesc_callback(struct hv_device *dev, void *packet, u32 len);

static struct mousevsc_dev *AllocInputDevice(struct hv_device *Device)
{
	struct mousevsc_dev *inputDevice;

inputDevice = kzalloc(sizeof(struct mousevsc_dev), GFP_KERNEL);

if (!inputDevice)
		return NULL;

/*
	 * Set to 2 to allow both inbound and outbound traffics
	 * (ie GetInputDevice() and MustGetInputDevice()) to proceed.
	 */
	atomic_cmpxchg(&inputDevice->RefCount, 0, 2);

inputDevice->Device = Device;
	Device->ext = inputDevice;

return inputDevice;
}

static void FreeInputDevice(struct mousevsc_dev *Device)
{
	WARN_ON(atomic_read(&Device->RefCount) == 0);
	kfree(Device);
}

/*
 * Get the inputdevice object if exists and its refcount > 1
 */
static struct mousevsc_dev *GetInputDevice(struct hv_device *Device)
{
	struct mousevsc_dev *inputDevice;