/* * 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 *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; 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; 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 */ 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 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,}; 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; Lines 1–500 of 594. 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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/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 *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; 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; 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 */ 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 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, }; 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;