+++ /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;
-};
-
-
-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 = 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)
- 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:
- /*
- * 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[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 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;
- 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)
- 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
- */
- if (input_dev->dev_info_status)
- ret = -ENOMEM;
-
-cleanup:
-
- return ret;
-}
-
-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 struct hid_ll_driver mousevsc_ll_driver = {
- .open = mousevsc_hid_open,
- .close = mousevsc_hid_close,
- .start = mousevsc_hid_start,
- .stop = mousevsc_hid_stop,
-};
-
-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 = 0;
- struct mousevsc_dev *input_dev;
- struct hid_device *hid_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)
- goto probe_err0;
-
- /* 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_err0;
- }
-
- 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");
-
- ret = hid_add_device(hid_dev);
- if (ret)
- goto probe_err1;
-
- ret = hid_parse_report(hid_dev, input_dev->report_desc,
- input_dev->report_desc_size);
-
- if (ret) {
- hid_err(hid_dev, "parse failed\n");
- goto probe_err1;
- }
-
- ret = hid_hw_start(hid_dev, HID_CONNECT_HIDINPUT | HID_CONNECT_HIDDEV);
-
- if (ret) {
- hid_err(hid_dev, "hw start failed\n");
- goto probe_err1;
- }
-
- input_dev->connected = true;
- input_dev->init_complete = true;
-
- return ret;
-
-probe_err1:
- hid_destroy_device(hid_dev);
-
-probe_err0:
- vmbus_close(device->channel);
- free_input_device(input_dev);
- return ret;
-}
-
-
-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 = false;
- 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 = 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_VERSION(HV_DRV_VERSION);
-module_init(mousevsc_init);
-module_exit(mousevsc_exit);
projects / mirror_ubuntu-artful-kernel.git / commitdiff