647 lines
16 KiB
Diff
647 lines
16 KiB
Diff
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From: "K. Y. Srinivasan" <kys@microsoft.com>
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Date: Thu, 17 Nov 2011 08:47:29 -0800
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Subject: [PATCH 02/77] HID: Move the hid-hyperv driver out of staging
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commit b95f5bcb811e3905b5376f87789da8d097fee682 upstream.
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The file hid-hyperv.c implements a hid compliant mouse driver for use on a
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Hyper-V based system. This driver is currently in the staging area and as part
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of the effort to move this driver out of staging, I had posted the driver code
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for community review a few weeks ago. This current patch addresses all the
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review comments I have gotten to date. All the relevant patches have already
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been submitted to the staging tree as well.
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As per Greg's suggestion, this patch does not get rid of the code from
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the staging area. Once the mouse driver lands under the hid directory,
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we will cleanup the staging directory.
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Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
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Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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---
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drivers/hid/Kconfig | 6 +
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drivers/hid/Makefile | 1 +
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drivers/hid/hid-hyperv.c | 582 ++++++++++++++++++++++++++++++++++++++++++++++
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3 files changed, 589 insertions(+)
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create mode 100644 drivers/hid/hid-hyperv.c
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diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
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index d21f6d0..4c09210 100644
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--- a/drivers/hid/Kconfig
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+++ b/drivers/hid/Kconfig
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@@ -646,6 +646,12 @@ config HID_ZYDACRON
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---help---
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Support for Zydacron remote control.
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+config HYPERV_MOUSE
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+ tristate "Microsoft Hyper-V mouse driver"
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+ depends on HYPERV
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+ ---help---
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+ Select this option to enable the Hyper-V mouse driver.
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+
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endmenu
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endif # HID_SUPPORT
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diff --git a/drivers/hid/Makefile b/drivers/hid/Makefile
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index 1e0d2a6..fbb1ee6 100644
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--- a/drivers/hid/Makefile
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+++ b/drivers/hid/Makefile
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@@ -78,6 +78,7 @@ obj-$(CONFIG_HID_ZYDACRON) += hid-zydacron.o
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obj-$(CONFIG_HID_WACOM) += hid-wacom.o
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obj-$(CONFIG_HID_WALTOP) += hid-waltop.o
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obj-$(CONFIG_HID_WIIMOTE) += hid-wiimote.o
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+obj-$(CONFIG_HYPERV_MOUSE) += hid-hyperv.o
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obj-$(CONFIG_USB_HID) += usbhid/
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obj-$(CONFIG_USB_MOUSE) += usbhid/
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diff --git a/drivers/hid/hid-hyperv.c b/drivers/hid/hid-hyperv.c
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new file mode 100644
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index 0000000..d503cbb
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--- /dev/null
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+++ b/drivers/hid/hid-hyperv.c
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@@ -0,0 +1,582 @@
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+/*
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+ * Copyright (c) 2009, Citrix Systems, Inc.
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+ * Copyright (c) 2010, Microsoft Corporation.
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+ * Copyright (c) 2011, Novell Inc.
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+ *
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+ * This program is free software; you can redistribute it and/or modify it
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+ * under the terms and conditions of the GNU General Public License,
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+ * version 2, as published by the Free Software Foundation.
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+ *
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+ * This program is distributed in the hope it will be useful, but WITHOUT
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+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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+ * more details.
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+ */
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+#include <linux/init.h>
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+#include <linux/module.h>
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+#include <linux/device.h>
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+#include <linux/completion.h>
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+#include <linux/input.h>
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+#include <linux/hid.h>
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+#include <linux/hiddev.h>
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+#include <linux/hyperv.h>
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+
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+
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+struct hv_input_dev_info {
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+ unsigned int size;
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+ unsigned short vendor;
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+ unsigned short product;
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+ unsigned short version;
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+ unsigned short reserved[11];
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+};
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+
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+/* The maximum size of a synthetic input message. */
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+#define SYNTHHID_MAX_INPUT_REPORT_SIZE 16
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+
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+/*
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+ * Current version
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+ *
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+ * History:
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+ * Beta, RC < 2008/1/22 1,0
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+ * RC > 2008/1/22 2,0
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+ */
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+#define SYNTHHID_INPUT_VERSION_MAJOR 2
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+#define SYNTHHID_INPUT_VERSION_MINOR 0
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+#define SYNTHHID_INPUT_VERSION (SYNTHHID_INPUT_VERSION_MINOR | \
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+ (SYNTHHID_INPUT_VERSION_MAJOR << 16))
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+
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+
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+#pragma pack(push, 1)
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+/*
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+ * Message types in the synthetic input protocol
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+ */
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+enum synthhid_msg_type {
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+ SYNTH_HID_PROTOCOL_REQUEST,
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+ SYNTH_HID_PROTOCOL_RESPONSE,
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+ SYNTH_HID_INITIAL_DEVICE_INFO,
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+ SYNTH_HID_INITIAL_DEVICE_INFO_ACK,
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+ SYNTH_HID_INPUT_REPORT,
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+ SYNTH_HID_MAX
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+};
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+
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+/*
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+ * Basic message structures.
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+ */
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+struct synthhid_msg_hdr {
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+ enum synthhid_msg_type type;
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+ u32 size;
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+};
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+
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+struct synthhid_msg {
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+ struct synthhid_msg_hdr header;
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+ char data[1]; /* Enclosed message */
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+};
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+
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+union synthhid_version {
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+ struct {
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+ u16 minor_version;
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+ u16 major_version;
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+ };
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+ u32 version;
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+};
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+
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+/*
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+ * Protocol messages
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+ */
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+struct synthhid_protocol_request {
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+ struct synthhid_msg_hdr header;
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+ union synthhid_version version_requested;
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+};
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+
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+struct synthhid_protocol_response {
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+ struct synthhid_msg_hdr header;
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+ union synthhid_version version_requested;
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+ unsigned char approved;
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+};
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+
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+struct synthhid_device_info {
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+ struct synthhid_msg_hdr header;
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+ struct hv_input_dev_info hid_dev_info;
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+ struct hid_descriptor hid_descriptor;
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+};
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+
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+struct synthhid_device_info_ack {
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+ struct synthhid_msg_hdr header;
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+ unsigned char reserved;
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+};
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+
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+struct synthhid_input_report {
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+ struct synthhid_msg_hdr header;
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+ char buffer[1];
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+};
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+
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+#pragma pack(pop)
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+
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+#define INPUTVSC_SEND_RING_BUFFER_SIZE (10*PAGE_SIZE)
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+#define INPUTVSC_RECV_RING_BUFFER_SIZE (10*PAGE_SIZE)
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+
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+
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+enum pipe_prot_msg_type {
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+ PIPE_MESSAGE_INVALID,
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+ PIPE_MESSAGE_DATA,
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+ PIPE_MESSAGE_MAXIMUM
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+};
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+
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+
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+struct pipe_prt_msg {
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+ enum pipe_prot_msg_type type;
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+ u32 size;
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+ char data[1];
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+};
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+
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+struct mousevsc_prt_msg {
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+ enum pipe_prot_msg_type type;
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+ u32 size;
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+ union {
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+ struct synthhid_protocol_request request;
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+ struct synthhid_protocol_response response;
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+ struct synthhid_device_info_ack ack;
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+ };
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+};
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+
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+/*
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+ * Represents an mousevsc device
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+ */
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+struct mousevsc_dev {
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+ struct hv_device *device;
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+ bool init_complete;
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+ bool connected;
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+ struct mousevsc_prt_msg protocol_req;
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+ struct mousevsc_prt_msg protocol_resp;
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+ /* Synchronize the request/response if needed */
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+ struct completion wait_event;
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+ int dev_info_status;
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+
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+ struct hid_descriptor *hid_desc;
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+ unsigned char *report_desc;
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+ u32 report_desc_size;
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+ struct hv_input_dev_info hid_dev_info;
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+ struct hid_device *hid_device;
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+};
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+
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+
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+static struct mousevsc_dev *mousevsc_alloc_device(struct hv_device *device)
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+{
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+ struct mousevsc_dev *input_dev;
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+
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+ input_dev = kzalloc(sizeof(struct mousevsc_dev), GFP_KERNEL);
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+
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+ if (!input_dev)
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+ return NULL;
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+
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+ input_dev->device = device;
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+ hv_set_drvdata(device, input_dev);
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+ init_completion(&input_dev->wait_event);
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+ input_dev->init_complete = false;
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+
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+ return input_dev;
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+}
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+
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+static void mousevsc_free_device(struct mousevsc_dev *device)
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+{
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+ kfree(device->hid_desc);
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+ kfree(device->report_desc);
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+ hv_set_drvdata(device->device, NULL);
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+ kfree(device);
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+}
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+
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+static void mousevsc_on_receive_device_info(struct mousevsc_dev *input_device,
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+ struct synthhid_device_info *device_info)
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+{
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+ int ret = 0;
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+ struct hid_descriptor *desc;
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+ struct mousevsc_prt_msg ack;
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+
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+ input_device->dev_info_status = -ENOMEM;
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+
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+ input_device->hid_dev_info = device_info->hid_dev_info;
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+ desc = &device_info->hid_descriptor;
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+ if (desc->bLength == 0)
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+ goto cleanup;
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+
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+ input_device->hid_desc = kzalloc(desc->bLength, GFP_ATOMIC);
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+
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+ if (!input_device->hid_desc)
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+ goto cleanup;
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+
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+ memcpy(input_device->hid_desc, desc, desc->bLength);
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+
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+ input_device->report_desc_size = desc->desc[0].wDescriptorLength;
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+ if (input_device->report_desc_size == 0) {
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+ input_device->dev_info_status = -EINVAL;
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+ goto cleanup;
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+ }
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+
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+ input_device->report_desc = kzalloc(input_device->report_desc_size,
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+ GFP_ATOMIC);
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+
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+ if (!input_device->report_desc) {
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+ input_device->dev_info_status = -ENOMEM;
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+ goto cleanup;
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+ }
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+
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+ memcpy(input_device->report_desc,
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+ ((unsigned char *)desc) + desc->bLength,
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+ desc->desc[0].wDescriptorLength);
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+
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+ /* Send the ack */
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+ memset(&ack, 0, sizeof(struct mousevsc_prt_msg));
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+
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+ ack.type = PIPE_MESSAGE_DATA;
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+ ack.size = sizeof(struct synthhid_device_info_ack);
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+
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+ ack.ack.header.type = SYNTH_HID_INITIAL_DEVICE_INFO_ACK;
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+ ack.ack.header.size = 1;
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+ ack.ack.reserved = 0;
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+
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+ ret = vmbus_sendpacket(input_device->device->channel,
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+ &ack,
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+ sizeof(struct pipe_prt_msg) - sizeof(unsigned char) +
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+ sizeof(struct synthhid_device_info_ack),
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+ (unsigned long)&ack,
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+ VM_PKT_DATA_INBAND,
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+ VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
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+
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+ if (!ret)
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+ input_device->dev_info_status = 0;
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+
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+cleanup:
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+ complete(&input_device->wait_event);
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+
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+ return;
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+}
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+
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+static void mousevsc_on_receive(struct hv_device *device,
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+ struct vmpacket_descriptor *packet)
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+{
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+ struct pipe_prt_msg *pipe_msg;
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+ struct synthhid_msg *hid_msg;
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+ struct mousevsc_dev *input_dev = hv_get_drvdata(device);
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+ struct synthhid_input_report *input_report;
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+
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+ pipe_msg = (struct pipe_prt_msg *)((unsigned long)packet +
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+ (packet->offset8 << 3));
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+
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+ if (pipe_msg->type != PIPE_MESSAGE_DATA)
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+ return;
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+
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+ hid_msg = (struct synthhid_msg *)pipe_msg->data;
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+
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+ switch (hid_msg->header.type) {
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+ case SYNTH_HID_PROTOCOL_RESPONSE:
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+ /*
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+ * While it will be impossible for us to protect against
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+ * malicious/buggy hypervisor/host, add a check here to
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+ * ensure we don't corrupt memory.
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+ */
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+ if ((pipe_msg->size + sizeof(struct pipe_prt_msg)
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+ - sizeof(unsigned char))
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+ > sizeof(struct mousevsc_prt_msg)) {
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+ WARN_ON(1);
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+ break;
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+ }
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+
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+ memcpy(&input_dev->protocol_resp, pipe_msg,
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+ pipe_msg->size + sizeof(struct pipe_prt_msg) -
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+ sizeof(unsigned char));
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+ complete(&input_dev->wait_event);
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+ break;
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+
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+ case SYNTH_HID_INITIAL_DEVICE_INFO:
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+ WARN_ON(pipe_msg->size < sizeof(struct hv_input_dev_info));
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+
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+ /*
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+ * Parse out the device info into device attr,
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+ * hid desc and report desc
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+ */
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+ mousevsc_on_receive_device_info(input_dev,
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+ (struct synthhid_device_info *)pipe_msg->data);
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+ break;
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+ case SYNTH_HID_INPUT_REPORT:
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+ input_report =
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+ (struct synthhid_input_report *)pipe_msg->data;
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+ if (!input_dev->init_complete)
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+ break;
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+ hid_input_report(input_dev->hid_device,
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+ HID_INPUT_REPORT, input_report->buffer,
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+ input_report->header.size, 1);
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+ break;
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+ default:
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+ pr_err("unsupported hid msg type - type %d len %d",
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+ hid_msg->header.type, hid_msg->header.size);
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+ break;
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+ }
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+
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+}
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+
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+static void mousevsc_on_channel_callback(void *context)
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+{
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+ const int packet_size = 0x100;
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+ int ret;
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+ struct hv_device *device = context;
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+ u32 bytes_recvd;
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+ u64 req_id;
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+ struct vmpacket_descriptor *desc;
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+ unsigned char *buffer;
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+ int bufferlen = packet_size;
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+
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+ buffer = kmalloc(bufferlen, GFP_ATOMIC);
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+ if (!buffer)
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+ return;
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+
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+ do {
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+ ret = vmbus_recvpacket_raw(device->channel, buffer,
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+ bufferlen, &bytes_recvd, &req_id);
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+
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+ switch (ret) {
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+ case 0:
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+ if (bytes_recvd <= 0) {
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+ kfree(buffer);
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+ return;
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+ }
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+ desc = (struct vmpacket_descriptor *)buffer;
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+
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+ switch (desc->type) {
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+ case VM_PKT_COMP:
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+ break;
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+
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+ case VM_PKT_DATA_INBAND:
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+ mousevsc_on_receive(device, desc);
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+ break;
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+
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+ default:
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+ pr_err("unhandled packet type %d, tid %llx len %d\n",
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+ desc->type, req_id, bytes_recvd);
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||
|
+ 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_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;
|
||
|
+ 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");
|
||
|
+
|
||
|
+ 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_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;
|
||
|
+ }
|
||
|
+
|
||
|
+ 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);
|
||
|
+
|
||
|
+ vmbus_close(dev->channel);
|
||
|
+ 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 */
|
||
|
+ { 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);
|
||
|
--
|
||
|
1.7.9.5
|
||
|
|