[mirror_ubuntu-artful-kernel.git] / drivers / hid / hid-hyperv.c

/*
 *  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/device.h>
#include <linux/completion.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)


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;
	bool			init_complete;
	bool			connected;
	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;
	struct hid_device       *hid_device;
	u8			input_buf[HID_MAX_BUFFER_SIZE];
};


static struct mousevsc_dev *mousevsc_alloc_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);
	input_dev->init_complete = false;

	return input_dev;
}

static void mousevsc_free_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;

	input_device->dev_info_status = -ENOMEM;

	input_device->hid_dev_info = device_info->hid_dev_info;
	desc = &device_info->hid_descriptor;
	if (desc->bLength == 0)
		goto cleanup;

	input_device->hid_desc = kmemdup(desc, desc->bLength, GFP_ATOMIC);

	if (!input_device->hid_desc)
		goto cleanup;

	input_device->report_desc_size = desc->desc[0].wDescriptorLength;
	if (input_device->report_desc_size == 0) {
		input_device->dev_info_status = -EINVAL;
		goto cleanup;
	}

	input_device->report_desc = kzalloc(input_device->report_desc_size,
					  GFP_ATOMIC);

	if (!input_device->report_desc) {
		input_device->dev_info_status = -ENOMEM;
		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)
		input_device->dev_info_status = 0;

cleanup:
	complete(&input_device->wait_event);

	return;
}

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;
	size_t len;

	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;

	switch (hid_msg->header.type) {
	case SYNTH_HID_PROTOCOL_RESPONSE:
		/*
		 * While it will be impossible for us to protect against
		 * malicious/buggy hypervisor/host, add a check here to
		 * ensure we don't corrupt memory.
		 */
		if ((pipe_msg->size + sizeof(struct pipe_prt_msg)
			- sizeof(unsigned char))
			> sizeof(struct mousevsc_prt_msg)) {
			WARN_ON(1);
			break;
		}

		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);
		break;
	case SYNTH_HID_INPUT_REPORT:
		input_report =
			(struct synthhid_input_report *)pipe_msg->data;
		if (!input_dev->init_complete)
			break;

		len = min(input_report->header.size,
			  (u32)sizeof(input_dev->input_buf));
		memcpy(input_dev->input_buf, input_report->buffer, len);
		hid_input_report(input_dev->hid_device, HID_INPUT_REPORT,
				 input_dev->input_buf, len, 1);

		pm_wakeup_event(&input_dev->device->device, 0);

		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 packet_size = 0x100;
	int ret;
	struct hv_device *device = context;
	u32 bytes_recvd;
	u64 req_id;
	struct vmpacket_descriptor *desc;
	unsigned char	*buffer;
	int	bufferlen = packet_size;

	buffer = kmalloc(bufferlen, GFP_ATOMIC);
	if (!buffer)
		return;

	do {
		ret = vmbus_recvpacket_raw(device->channel, buffer,
					bufferlen, &bytes_recvd, &req_id);

		switch (ret) {
		case 0:
			if (bytes_recvd <= 0) {
				kfree(buffer);
				return;
			}
			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;
			}

			break;

		case -ENOBUFS:
			kfree(buffer);
			/* Handle large packet */
			bufferlen = bytes_recvd;
			buffer = kmalloc(bytes_recvd, GFP_ATOMIC);

			if (!buffer)
				return;

			break;
		}
	} while (1);

}

static int mousevsc_connect_to_vsp(struct hv_device *device)
{
	int ret = 0;
	unsigned long 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)
		goto cleanup;

	t = wait_for_completion_timeout(&input_dev->wait_event, 5*HZ);
	if (!t) {
		ret = -ETIMEDOUT;
		goto cleanup;
	}

	response = &input_dev->protocol_resp;

	if (!response->response.approved) {
		pr_err("synthhid protocol request failed (version %d)\n",
		       SYNTHHID_INPUT_VERSION);
		ret = -ENODEV;
		goto cleanup;
	}

	t = wait_for_completion_timeout(&input_dev->wait_event, 5*HZ);
	if (!t) {
		ret = -ETIMEDOUT;
		goto cleanup;
	}

	/*
	 * We should have gotten the device attr, hid desc and report
	 * desc at this point
	 */
	ret = input_dev->dev_info_status;

cleanup:
	return ret;
}

static int mousevsc_hid_parse(struct hid_device *hid)
{
	struct hv_device *dev = hid_get_drvdata(hid);
	struct mousevsc_dev *input_dev = hv_get_drvdata(dev);

	return hid_parse_report(hid, input_dev->report_desc,
				input_dev->report_desc_size);
}

static int mousevsc_hid_open(struct hid_device *hid)
{
	return 0;
}

static int mousevsc_hid_start(struct hid_device *hid)
{
	return 0;
}

static void mousevsc_hid_close(struct hid_device *hid)
{
}

static void mousevsc_hid_stop(struct hid_device *hid)
{
}

static int mousevsc_hid_raw_request(struct hid_device *hid,
				    unsigned char report_num,
				    __u8 *buf, size_t len,
				    unsigned char rtype,
				    int reqtype)
{
	return 0;
}

static struct hid_ll_driver mousevsc_ll_driver = {
	.parse = mousevsc_hid_parse,
	.open = mousevsc_hid_open,
	.close = mousevsc_hid_close,
	.start = mousevsc_hid_start,
	.stop = mousevsc_hid_stop,
	.raw_request = mousevsc_hid_raw_request,
};

static struct hid_driver mousevsc_hid_driver;

static int mousevsc_probe(struct hv_device *device,
			const struct hv_vmbus_device_id *dev_id)
{
	int ret;
	struct mousevsc_dev *input_dev;
	struct hid_device *hid_dev;

	input_dev = mousevsc_alloc_device(device);

	if (!input_dev)
		return -ENOMEM;

	ret = vmbus_open(device->channel,
		INPUTVSC_SEND_RING_BUFFER_SIZE,
		INPUTVSC_RECV_RING_BUFFER_SIZE,
		NULL,
		0,
		mousevsc_on_channel_callback,
		device
		);

	if (ret)
		goto probe_err0;

	ret = mousevsc_connect_to_vsp(device);

	if (ret)
		goto probe_err1;

	/* workaround SA-167 */
	if (input_dev->report_desc[14] == 0x25)
		input_dev->report_desc[14] = 0x29;

	hid_dev = hid_allocate_device();
	if (IS_ERR(hid_dev)) {
		ret = PTR_ERR(hid_dev);
		goto probe_err1;
	}

	hid_dev->ll_driver = &mousevsc_ll_driver;
	hid_dev->driver = &mousevsc_hid_driver;
	hid_dev->bus = BUS_VIRTUAL;
	hid_dev->vendor = input_dev->hid_dev_info.vendor;
	hid_dev->product = input_dev->hid_dev_info.product;
	hid_dev->version = input_dev->hid_dev_info.version;
	input_dev->hid_device = hid_dev;

	sprintf(hid_dev->name, "%s", "Microsoft Vmbus HID-compliant Mouse");

	hid_set_drvdata(hid_dev, device);

	ret = hid_add_device(hid_dev);
	if (ret)
		goto probe_err1;


	ret = hid_parse(hid_dev);
	if (ret) {
		hid_err(hid_dev, "parse failed\n");
		goto probe_err2;
	}

	ret = hid_hw_start(hid_dev, HID_CONNECT_HIDINPUT | HID_CONNECT_HIDDEV);

	if (ret) {
		hid_err(hid_dev, "hw start failed\n");
		goto probe_err2;
	}

	device_init_wakeup(&device->device, true);

	input_dev->connected = true;
	input_dev->init_complete = true;

	return ret;

probe_err2:
	hid_destroy_device(hid_dev);

probe_err1:
	vmbus_close(device->channel);

probe_err0:
	mousevsc_free_device(input_dev);

	return ret;
}


static int mousevsc_remove(struct hv_device *dev)
{
	struct mousevsc_dev *input_dev = hv_get_drvdata(dev);

	device_init_wakeup(&dev->device, false);
	vmbus_close(dev->channel);
	hid_hw_stop(input_dev->hid_device);
	hid_destroy_device(input_dev->hid_device);
	mousevsc_free_device(input_dev);

	return 0;
}

static const struct hv_vmbus_device_id id_table[] = {
	/* Mouse guid */
	{ HV_MOUSE_GUID, },
	{ },
};

MODULE_DEVICE_TABLE(vmbus, id_table);

static struct  hv_driver mousevsc_drv = {
	.name = KBUILD_MODNAME,
	.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_init(mousevsc_init);
module_exit(mousevsc_exit);
Commit	Line	Data
b95f5bcb S	1	/*
	2	* Copyright (c) 2009, Citrix Systems, Inc.
	3	* Copyright (c) 2010, Microsoft Corporation.
	4	* Copyright (c) 2011, Novell Inc.
	5	*
	6	* This program is free software; you can redistribute it and/or modify it
	7	* under the terms and conditions of the GNU General Public License,
	8	* version 2, as published by the Free Software Foundation.
	9	*
	10	* This program is distributed in the hope it will be useful, but WITHOUT
	11	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	12	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	13	* more details.
	14	*/
	15	#include <linux/init.h>
	16	#include <linux/module.h>
	17	#include <linux/device.h>
	18	#include <linux/completion.h>
	19	#include <linux/input.h>
	20	#include <linux/hid.h>
	21	#include <linux/hiddev.h>
	22	#include <linux/hyperv.h>
	23
	24
	25	struct hv_input_dev_info {
	26	unsigned int size;
	27	unsigned short vendor;
	28	unsigned short product;
	29	unsigned short version;
	30	unsigned short reserved[11];
	31	};
	32
	33	/* The maximum size of a synthetic input message. */
	34	#define SYNTHHID_MAX_INPUT_REPORT_SIZE 16
	35
	36	/*
	37	* Current version
	38	*
	39	* History:
	40	* Beta, RC < 2008/1/22 1,0
	41	* RC > 2008/1/22 2,0
	42	*/
	43	#define SYNTHHID_INPUT_VERSION_MAJOR 2
	44	#define SYNTHHID_INPUT_VERSION_MINOR 0
	45	#define SYNTHHID_INPUT_VERSION (SYNTHHID_INPUT_VERSION_MINOR \| \
	46	(SYNTHHID_INPUT_VERSION_MAJOR << 16))
	47
	48
	49	#pragma pack(push, 1)
	50	/*
	51	* Message types in the synthetic input protocol
	52	*/
	53	enum synthhid_msg_type {
	54	SYNTH_HID_PROTOCOL_REQUEST,
	55	SYNTH_HID_PROTOCOL_RESPONSE,
	56	SYNTH_HID_INITIAL_DEVICE_INFO,
	57	SYNTH_HID_INITIAL_DEVICE_INFO_ACK,
	58	SYNTH_HID_INPUT_REPORT,
	59	SYNTH_HID_MAX
	60	};
	61
	62	/*
	63	* Basic message structures.
	64	*/
65	struct synthhid_msg_hdr {
66	enum synthhid_msg_type type;
67	u32 size;
68	};
69
70	struct synthhid_msg {
71	struct synthhid_msg_hdr header;
72	char data[1]; /* Enclosed message */
73	};
74
75	union synthhid_version {
76	struct {
77	u16 minor_version;
78	u16 major_version;
79	};
80	u32 version;
81	};
82
83	/*
84	* Protocol messages
85	*/
86	struct synthhid_protocol_request {
87	struct synthhid_msg_hdr header;
88	union synthhid_version version_requested;
89	};
90
91	struct synthhid_protocol_response {
92	struct synthhid_msg_hdr header;
93	union synthhid_version version_requested;
94	unsigned char approved;
95	};
96
97	struct synthhid_device_info {
98	struct synthhid_msg_hdr header;
99	struct hv_input_dev_info hid_dev_info;
100	struct hid_descriptor hid_descriptor;
101	};
102
103	struct synthhid_device_info_ack {
104	struct synthhid_msg_hdr header;
105	unsigned char reserved;
106	};
107
108	struct synthhid_input_report {
109	struct synthhid_msg_hdr header;
110	char buffer[1];
111	};
112
113	#pragma pack(pop)
114
115	#define INPUTVSC_SEND_RING_BUFFER_SIZE (10*PAGE_SIZE)
116	#define INPUTVSC_RECV_RING_BUFFER_SIZE (10*PAGE_SIZE)
117
118
119	enum pipe_prot_msg_type {
120	PIPE_MESSAGE_INVALID,
121	PIPE_MESSAGE_DATA,
122	PIPE_MESSAGE_MAXIMUM
123	};
124
125
126	struct pipe_prt_msg {
127	enum pipe_prot_msg_type type;
128	u32 size;
129	char data[1];
130	};
131
132	struct mousevsc_prt_msg {
133	enum pipe_prot_msg_type type;
134	u32 size;
135	union {
136	struct synthhid_protocol_request request;
137	struct synthhid_protocol_response response;
138	struct synthhid_device_info_ack ack;
139	};
140	};
141
142	/*
143	* Represents an mousevsc device
144	*/
145	struct mousevsc_dev {
146	struct hv_device *device;
147	bool init_complete;
148	bool connected;
149	struct mousevsc_prt_msg protocol_req;
150	struct mousevsc_prt_msg protocol_resp;
151	/* Synchronize the request/response if needed */
152	struct completion wait_event;
153	int dev_info_status;
154
155	struct hid_descriptor *hid_desc;
156	unsigned char *report_desc;
157	u32 report_desc_size;
158	struct hv_input_dev_info hid_dev_info;
159	struct hid_device *hid_device;
3ccfd0a8	160	u8 input_buf[HID_MAX_BUFFER_SIZE];
b95f5bcb S	161	};
	162
	163
	164	static struct mousevsc_dev mousevsc_alloc_device(struct hv_device device)
	165	{
	166	struct mousevsc_dev *input_dev;
	167
	168	input_dev = kzalloc(sizeof(struct mousevsc_dev), GFP_KERNEL);
	169
	170	if (!input_dev)
	171	return NULL;
	172
	173	input_dev->device = device;
	174	hv_set_drvdata(device, input_dev);
	175	init_completion(&input_dev->wait_event);
	176	input_dev->init_complete = false;
	177
	178	return input_dev;
	179	}
	180
	181	static void mousevsc_free_device(struct mousevsc_dev *device)
	182	{
	183	kfree(device->hid_desc);
	184	kfree(device->report_desc);
	185	hv_set_drvdata(device->device, NULL);
	186	kfree(device);
	187	}
	188
	189	static void mousevsc_on_receive_device_info(struct mousevsc_dev *input_device,
	190	struct synthhid_device_info *device_info)
	191	{
	192	int ret = 0;
	193	struct hid_descriptor *desc;
	194	struct mousevsc_prt_msg ack;
	195
	196	input_device->dev_info_status = -ENOMEM;
	197
	198	input_device->hid_dev_info = device_info->hid_dev_info;
	199	desc = &device_info->hid_descriptor;
	200	if (desc->bLength == 0)
	201	goto cleanup;
	202
a4a23f6d	203	input_device->hid_desc = kmemdup(desc, desc->bLength, GFP_ATOMIC);
b95f5bcb S	204
	205	if (!input_device->hid_desc)
	206	goto cleanup;
	207
b95f5bcb S	208	input_device->report_desc_size = desc->desc[0].wDescriptorLength;
	209	if (input_device->report_desc_size == 0) {
	210	input_device->dev_info_status = -EINVAL;
	211	goto cleanup;
	212	}
	213
	214	input_device->report_desc = kzalloc(input_device->report_desc_size,
	215	GFP_ATOMIC);
	216
	217	if (!input_device->report_desc) {
	218	input_device->dev_info_status = -ENOMEM;
	219	goto cleanup;
	220	}
	221
	222	memcpy(input_device->report_desc,
	223	((unsigned char *)desc) + desc->bLength,
	224	desc->desc[0].wDescriptorLength);
	225
	226	/* Send the ack */
	227	memset(&ack, 0, sizeof(struct mousevsc_prt_msg));
	228
	229	ack.type = PIPE_MESSAGE_DATA;
	230	ack.size = sizeof(struct synthhid_device_info_ack);
	231
	232	ack.ack.header.type = SYNTH_HID_INITIAL_DEVICE_INFO_ACK;
	233	ack.ack.header.size = 1;
	234	ack.ack.reserved = 0;
	235
	236	ret = vmbus_sendpacket(input_device->device->channel,
	237	&ack,
	238	sizeof(struct pipe_prt_msg) - sizeof(unsigned char) +
	239	sizeof(struct synthhid_device_info_ack),
	240	(unsigned long)&ack,
	241	VM_PKT_DATA_INBAND,
	242	VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
	243
	244	if (!ret)
	245	input_device->dev_info_status = 0;
	246
	247	cleanup:
	248	complete(&input_device->wait_event);
	249
	250	return;
	251	}
	252
	253	static void mousevsc_on_receive(struct hv_device *device,
	254	struct vmpacket_descriptor *packet)
	255	{
	256	struct pipe_prt_msg *pipe_msg;
	257	struct synthhid_msg *hid_msg;
	258	struct mousevsc_dev *input_dev = hv_get_drvdata(device);
	259	struct synthhid_input_report *input_report;
3ccfd0a8	260	size_t len;
b95f5bcb S	261
	262	pipe_msg = (struct pipe_prt_msg *)((unsigned long)packet +
	263	(packet->offset8 << 3));
	264
	265	if (pipe_msg->type != PIPE_MESSAGE_DATA)
	266	return;
	267
	268	hid_msg = (struct synthhid_msg *)pipe_msg->data;
	269
	270	switch (hid_msg->header.type) {
	271	case SYNTH_HID_PROTOCOL_RESPONSE:
	272	/*
	273	* While it will be impossible for us to protect against
	274	* malicious/buggy hypervisor/host, add a check here to
	275	* ensure we don't corrupt memory.
	276	*/
	277	if ((pipe_msg->size + sizeof(struct pipe_prt_msg)
	278	- sizeof(unsigned char))
	279	> sizeof(struct mousevsc_prt_msg)) {
	280	WARN_ON(1);
	281	break;
	282	}
	283
	284	memcpy(&input_dev->protocol_resp, pipe_msg,
	285	pipe_msg->size + sizeof(struct pipe_prt_msg) -
	286	sizeof(unsigned char));
	287	complete(&input_dev->wait_event);
	288	break;
	289
	290	case SYNTH_HID_INITIAL_DEVICE_INFO:
	291	WARN_ON(pipe_msg->size < sizeof(struct hv_input_dev_info));
	292
	293	/*
	294	* Parse out the device info into device attr,
	295	* hid desc and report desc
	296	*/
	297	mousevsc_on_receive_device_info(input_dev,
	298	(struct synthhid_device_info *)pipe_msg->data);
	299	break;
	300	case SYNTH_HID_INPUT_REPORT:
	301	input_report =
	302	(struct synthhid_input_report *)pipe_msg->data;
	303	if (!input_dev->init_complete)
	304	break;
3ccfd0a8 DH	305
	306	len = min(input_report->header.size,
	307	(u32)sizeof(input_dev->input_buf));
	308	memcpy(input_dev->input_buf, input_report->buffer, len);
	309	hid_input_report(input_dev->hid_device, HID_INPUT_REPORT,
	310	input_dev->input_buf, len, 1);
f1210455 DC	311
	312	pm_wakeup_event(&input_dev->device->device, 0);
	313
b95f5bcb S	314	break;
	315	default:
	316	pr_err("unsupported hid msg type - type %d len %d",
	317	hid_msg->header.type, hid_msg->header.size);
	318	break;
	319	}
	320
	321	}
	322
	323	static void mousevsc_on_channel_callback(void *context)
	324	{
	325	const int packet_size = 0x100;
	326	int ret;
	327	struct hv_device *device = context;
	328	u32 bytes_recvd;
	329	u64 req_id;
	330	struct vmpacket_descriptor *desc;
	331	unsigned char *buffer;
	332	int bufferlen = packet_size;
	333
	334	buffer = kmalloc(bufferlen, GFP_ATOMIC);
	335	if (!buffer)
	336	return;
	337
	338	do {
	339	ret = vmbus_recvpacket_raw(device->channel, buffer,
	340	bufferlen, &bytes_recvd, &req_id);
	341
	342	switch (ret) {
	343	case 0:
	344	if (bytes_recvd <= 0) {
	345	kfree(buffer);
	346	return;
	347	}
	348	desc = (struct vmpacket_descriptor *)buffer;
	349
	350	switch (desc->type) {
	351	case VM_PKT_COMP:
	352	break;
	353
	354	case VM_PKT_DATA_INBAND:
	355	mousevsc_on_receive(device, desc);
	356	break;
	357
	358	default:
	359	pr_err("unhandled packet type %d, tid %llx len %d\n",
	360	desc->type, req_id, bytes_recvd);
	361	break;
	362	}
	363
	364	break;
	365
	366	case -ENOBUFS:
	367	kfree(buffer);
	368	/* Handle large packet */
	369	bufferlen = bytes_recvd;
	370	buffer = kmalloc(bytes_recvd, GFP_ATOMIC);
	371
	372	if (!buffer)
	373	return;
	374
	375	break;
	376	}
	377	} while (1);
378
379	}
380
381	static int mousevsc_connect_to_vsp(struct hv_device *device)
382	{
383	int ret = 0;
3458e4c0	384	unsigned long t;
b95f5bcb S	385	struct mousevsc_dev *input_dev = hv_get_drvdata(device);
	386	struct mousevsc_prt_msg *request;
	387	struct mousevsc_prt_msg *response;
	388
	389	request = &input_dev->protocol_req;
	390	memset(request, 0, sizeof(struct mousevsc_prt_msg));
	391
	392	request->type = PIPE_MESSAGE_DATA;
	393	request->size = sizeof(struct synthhid_protocol_request);
	394	request->request.header.type = SYNTH_HID_PROTOCOL_REQUEST;
	395	request->request.header.size = sizeof(unsigned int);
	396	request->request.version_requested.version = SYNTHHID_INPUT_VERSION;
	397
	398	ret = vmbus_sendpacket(device->channel, request,
	399	sizeof(struct pipe_prt_msg) -
	400	sizeof(unsigned char) +
	401	sizeof(struct synthhid_protocol_request),
	402	(unsigned long)request,
	403	VM_PKT_DATA_INBAND,
	404	VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
	405	if (ret)
	406	goto cleanup;
	407
	408	t = wait_for_completion_timeout(&input_dev->wait_event, 5*HZ);
	409	if (!t) {
	410	ret = -ETIMEDOUT;
	411	goto cleanup;
	412	}
	413
	414	response = &input_dev->protocol_resp;
	415
	416	if (!response->response.approved) {
	417	pr_err("synthhid protocol request failed (version %d)\n",
	418	SYNTHHID_INPUT_VERSION);
	419	ret = -ENODEV;
	420	goto cleanup;
	421	}
	422
	423	t = wait_for_completion_timeout(&input_dev->wait_event, 5*HZ);
	424	if (!t) {
	425	ret = -ETIMEDOUT;
	426	goto cleanup;
	427	}
	428
	429	/*
	430	* We should have gotten the device attr, hid desc and report
	431	* desc at this point
	432	*/
	433	ret = input_dev->dev_info_status;
	434
	435	cleanup:
	436	return ret;
	437	}
	438
07d9ab4f HR	439	static int mousevsc_hid_parse(struct hid_device *hid)
	440	{
	441	struct hv_device *dev = hid_get_drvdata(hid);
	442	struct mousevsc_dev *input_dev = hv_get_drvdata(dev);
	443
	444	return hid_parse_report(hid, input_dev->report_desc,
	445	input_dev->report_desc_size);
	446	}
	447
b95f5bcb S	448	static int mousevsc_hid_open(struct hid_device *hid)
	449	{
	450	return 0;
	451	}
	452
	453	static int mousevsc_hid_start(struct hid_device *hid)
	454	{
	455	return 0;
	456	}
	457
	458	static void mousevsc_hid_close(struct hid_device *hid)
	459	{
	460	}
	461
	462	static void mousevsc_hid_stop(struct hid_device *hid)
	463	{
	464	}
	465
269ddfc6 S	466	static int mousevsc_hid_raw_request(struct hid_device *hid,
269ddfc6 S	467	unsigned char report_num,
c3d77fab	468	__u8 *buf, size_t len,
269ddfc6 S	469	unsigned char rtype,
	470	int reqtype)
	471	{
	472	return 0;
	473	}
	474
b95f5bcb	475	static struct hid_ll_driver mousevsc_ll_driver = {
07d9ab4f	476	.parse = mousevsc_hid_parse,
b95f5bcb S	477	.open = mousevsc_hid_open,
	478	.close = mousevsc_hid_close,
	479	.start = mousevsc_hid_start,
	480	.stop = mousevsc_hid_stop,
269ddfc6	481	.raw_request = mousevsc_hid_raw_request,
b95f5bcb S	482	};
	483
	484	static struct hid_driver mousevsc_hid_driver;
	485
	486	static int mousevsc_probe(struct hv_device *device,
	487	const struct hv_vmbus_device_id *dev_id)
	488	{
	489	int ret;
	490	struct mousevsc_dev *input_dev;
	491	struct hid_device *hid_dev;
	492
	493	input_dev = mousevsc_alloc_device(device);
	494
	495	if (!input_dev)
	496	return -ENOMEM;
	497
	498	ret = vmbus_open(device->channel,
	499	INPUTVSC_SEND_RING_BUFFER_SIZE,
	500	INPUTVSC_RECV_RING_BUFFER_SIZE,
	501	NULL,
	502	0,
	503	mousevsc_on_channel_callback,
	504	device
	505	);
	506
	507	if (ret)
	508	goto probe_err0;
	509
	510	ret = mousevsc_connect_to_vsp(device);
	511
	512	if (ret)
	513	goto probe_err1;
	514
	515	/* workaround SA-167 */
	516	if (input_dev->report_desc[14] == 0x25)
	517	input_dev->report_desc[14] = 0x29;
	518
	519	hid_dev = hid_allocate_device();
	520	if (IS_ERR(hid_dev)) {
	521	ret = PTR_ERR(hid_dev);
	522	goto probe_err1;
	523	}
	524
	525	hid_dev->ll_driver = &mousevsc_ll_driver;
	526	hid_dev->driver = &mousevsc_hid_driver;
	527	hid_dev->bus = BUS_VIRTUAL;
	528	hid_dev->vendor = input_dev->hid_dev_info.vendor;
	529	hid_dev->product = input_dev->hid_dev_info.product;
	530	hid_dev->version = input_dev->hid_dev_info.version;
	531	input_dev->hid_device = hid_dev;
	532
	533	sprintf(hid_dev->name, "%s", "Microsoft Vmbus HID-compliant Mouse");
	534
b565a390 S	535	hid_set_drvdata(hid_dev, device);
b565a390 S	536
74c4fb05 S	537	ret = hid_add_device(hid_dev);
	538	if (ret)
	539	goto probe_err1;
	540
b95f5bcb	541
07d9ab4f	542	ret = hid_parse(hid_dev);
b95f5bcb S	543	if (ret) {
	544	hid_err(hid_dev, "parse failed\n");
	545	goto probe_err2;
	546	}
	547
	548	ret = hid_hw_start(hid_dev, HID_CONNECT_HIDINPUT \| HID_CONNECT_HIDDEV);
	549
	550	if (ret) {
	551	hid_err(hid_dev, "hw start failed\n");
	552	goto probe_err2;
	553	}
	554
f1210455 DC	555	device_init_wakeup(&device->device, true);
f1210455 DC	556
b95f5bcb S	557	input_dev->connected = true;
	558	input_dev->init_complete = true;
	559
	560	return ret;
	561
	562	probe_err2:
	563	hid_destroy_device(hid_dev);
	564
	565	probe_err1:
	566	vmbus_close(device->channel);
	567
	568	probe_err0:
	569	mousevsc_free_device(input_dev);
	570
	571	return ret;
	572	}
	573
	574
	575	static int mousevsc_remove(struct hv_device *dev)
	576	{
	577	struct mousevsc_dev *input_dev = hv_get_drvdata(dev);
	578
f1210455	579	device_init_wakeup(&dev->device, false);
b95f5bcb	580	vmbus_close(dev->channel);
c1c454b8	581	hid_hw_stop(input_dev->hid_device);
b95f5bcb S	582	hid_destroy_device(input_dev->hid_device);
	583	mousevsc_free_device(input_dev);
	584
	585	return 0;
	586	}
	587
	588	static const struct hv_vmbus_device_id id_table[] = {
	589	/* Mouse guid */
048c5add	590	{ HV_MOUSE_GUID, },
b95f5bcb S	591	{ },
	592	};
	593
	594	MODULE_DEVICE_TABLE(vmbus, id_table);
	595
	596	static struct hv_driver mousevsc_drv = {
	597	.name = KBUILD_MODNAME,
	598	.id_table = id_table,
	599	.probe = mousevsc_probe,
	600	.remove = mousevsc_remove,
	601	};
	602
	603	static int __init mousevsc_init(void)
	604	{
	605	return vmbus_driver_register(&mousevsc_drv);
	606	}
	607
	608	static void __exit mousevsc_exit(void)
	609	{
	610	vmbus_driver_unregister(&mousevsc_drv);
	611	}
	612
	613	MODULE_LICENSE("GPL");
b95f5bcb S	614	module_init(mousevsc_init);
b95f5bcb S	615	module_exit(mousevsc_exit);