diff options
Diffstat (limited to 'drivers/hid/hid-hyperv.c')
| -rw-r--r-- | drivers/hid/hid-hyperv.c | 608 |
1 files changed, 608 insertions, 0 deletions
diff --git a/drivers/hid/hid-hyperv.c b/drivers/hid/hid-hyperv.c new file mode 100644 index 000000000..b7704dd68 --- /dev/null +++ b/drivers/hid/hid-hyperv.c @@ -0,0 +1,608 @@ +// 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]; +}; + +/* 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 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[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; + + /* 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 = desc->desc[0].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, + 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_hard_event(&input_dev->device->device); + + break; + default: + pr_err("unsupported hid msg type - type %d len %d\n", + hid_msg->header.type, hid_msg->header.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(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_err2; + + + 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 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) +{ + return vmbus_driver_register(&mousevsc_drv); +} + +static void __exit mousevsc_exit(void) +{ + vmbus_driver_unregister(&mousevsc_drv); +} + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Microsoft Hyper-V Synthetic HID Driver"); + +module_init(mousevsc_init); +module_exit(mousevsc_exit); |