--- /dev/null
+/*
+ * 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);
Code Review / kvmfornfv.git / blobdiff