Something went wrong. Try again.
Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Something went wrong. Try again.
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490491492493494495496497498499500501502503504505506507508509510511512513514515516517518519520521522523524525526527528529530531532533534535536537538539540541542543544545546547548549550551552553554555556557558559560561562563564565566567568569570571572573574575576577578579580581582583584585586587588589590591592593594595596597598599600601602603604605606607608609610611612613614615616617618619// SPDX-License-Identifier: GPL-2.0-only/* * Copyright (c) 2009, Citrix Systems, Inc. * Copyright (c) 2010, Microsoft Corporation. * Copyright (c) 2011, Novell Inc. */#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];};
/* * 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;};
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[];};
#pragma pack(pop)
#define INPUTVSC_SEND_RING_BUFFER_SIZE VMBUS_RING_SIZE(36 * 1024)#define INPUTVSC_RECV_RING_BUFFER_SIZE VMBUS_RING_SIZE(36 * 1024)
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[];};
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_obj(struct mousevsc_dev);
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;
/* The pointer is not NULL when we resume from hibernation */ kfree(input_device->hid_desc); input_device->hid_desc = kmemdup(desc, desc->bLength, GFP_ATOMIC);
if (!input_device->hid_desc) goto cleanup;
input_device->report_desc_size = le16_to_cpu( desc->rpt_desc.wDescriptorLength); if (input_device->report_desc_size == 0) { input_device->dev_info_status = -EINVAL; goto cleanup; }
/* The pointer is not NULL when we resume from hibernation */ kfree(input_device->report_desc); 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, le16_to_cpu(desc->rpt_desc.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(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_hdr *hid_msg_hdr; 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_hdr = (struct synthhid_msg_hdr *)pipe_msg->data;
switch (hid_msg_hdr->type) { case SYNTH_HID_PROTOCOL_RESPONSE: len = struct_size(pipe_msg, data, pipe_msg->size);
/* * 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 (WARN_ON(len > sizeof(struct mousevsc_prt_msg))) break;
memcpy(&input_dev->protocol_resp, pipe_msg, len); 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_hard_event(&input_dev->device->device);
break; default: pr_err("unsupported hid msg type - type %d len %d\n", hid_msg_hdr->type, hid_msg_hdr->size); break; }
}
static void mousevsc_on_channel_callback(void *context){ struct hv_device *device = context; struct vmpacket_descriptor *desc;
foreach_vmbus_pkt(desc, device->channel) { 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, desc->trans_id, desc->len8 * 8); break; } }}
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;
reinit_completion(&input_dev->wait_event);
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(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 int mousevsc_hid_probe(struct hid_device *hid_dev, const struct hid_device_id *id){ int ret;
ret = hid_parse(hid_dev); if (ret) { hid_err(hid_dev, "parse failed\n"); return ret; }
ret = hid_hw_start(hid_dev, HID_CONNECT_HIDINPUT | HID_CONNECT_HIDDEV); if (ret) { hid_err(hid_dev, "hw start failed\n"); return ret; }
return 0;}
static const 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 const struct hid_device_id mousevsc_devices[] = { { HID_DEVICE(BUS_VIRTUAL, HID_GROUP_ANY, 0x045E, 0x0621) }, { }};
static struct hid_driver mousevsc_hid_driver = { .name = "hid-hyperv", .id_table = mousevsc_devices, .probe = mousevsc_hid_probe,};
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->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_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 void 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);}
static int mousevsc_suspend(struct hv_device *dev){ vmbus_close(dev->channel);
return 0;}
static int mousevsc_resume(struct hv_device *dev){ int ret;
ret = vmbus_open(dev->channel, INPUTVSC_SEND_RING_BUFFER_SIZE, INPUTVSC_RECV_RING_BUFFER_SIZE, NULL, 0, mousevsc_on_channel_callback, dev); if (ret) return ret;
ret = mousevsc_connect_to_vsp(dev); return ret;}
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, .suspend = mousevsc_suspend, .resume = mousevsc_resume, .driver = { .probe_type = PROBE_PREFER_ASYNCHRONOUS, },};
static int __init mousevsc_init(void){ int ret;
ret = hid_register_driver(&mousevsc_hid_driver); if (ret) return ret;
ret = vmbus_driver_register(&mousevsc_drv); if (ret) hid_unregister_driver(&mousevsc_hid_driver);
return ret;}
static void __exit mousevsc_exit(void){ vmbus_driver_unregister(&mousevsc_drv); hid_unregister_driver(&mousevsc_hid_driver);}
MODULE_LICENSE("GPL");MODULE_DESCRIPTION("Microsoft Hyper-V Synthetic HID Driver");
module_init(mousevsc_init);module_exit(mousevsc_exit);