Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2053 insertions, 0 deletions

diff --git a/drivers/hid/hid-logitech-dj.c b/drivers/hid/hid-logitech-dj.c
new file mode 100644
index 000000000..08768e5ac
--- /dev/null
+++ b/drivers/hid/hid-logitech-dj.c
@@ -0,0 +1,2053 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *  HID driver for Logitech receivers
+ *
+ *  Copyright (c) 2011 Logitech
+ */
+
+
+
+#include <linux/device.h>
+#include <linux/hid.h>
+#include <linux/module.h>
+#include <linux/kfifo.h>
+#include <linux/delay.h>
+#include <linux/usb.h> /* For to_usb_interface for kvm extra intf check */
+#include <asm/unaligned.h>
+#include "hid-ids.h"
+
+#define DJ_MAX_PAIRED_DEVICES			7
+#define DJ_MAX_NUMBER_NOTIFS			8
+#define DJ_RECEIVER_INDEX			0
+#define DJ_DEVICE_INDEX_MIN			1
+#define DJ_DEVICE_INDEX_MAX			7
+
+#define DJREPORT_SHORT_LENGTH			15
+#define DJREPORT_LONG_LENGTH			32
+
+#define REPORT_ID_DJ_SHORT			0x20
+#define REPORT_ID_DJ_LONG			0x21
+
+#define REPORT_ID_HIDPP_SHORT			0x10
+#define REPORT_ID_HIDPP_LONG			0x11
+#define REPORT_ID_HIDPP_VERY_LONG		0x12
+
+#define HIDPP_REPORT_SHORT_LENGTH		7
+#define HIDPP_REPORT_LONG_LENGTH		20
+
+#define HIDPP_RECEIVER_INDEX			0xff
+
+#define REPORT_TYPE_RFREPORT_FIRST		0x01
+#define REPORT_TYPE_RFREPORT_LAST		0x1F
+
+/* Command Switch to DJ mode */
+#define REPORT_TYPE_CMD_SWITCH			0x80
+#define CMD_SWITCH_PARAM_DEVBITFIELD		0x00
+#define CMD_SWITCH_PARAM_TIMEOUT_SECONDS	0x01
+#define TIMEOUT_NO_KEEPALIVE			0x00
+
+/* Command to Get the list of Paired devices */
+#define REPORT_TYPE_CMD_GET_PAIRED_DEVICES	0x81
+
+/* Device Paired Notification */
+#define REPORT_TYPE_NOTIF_DEVICE_PAIRED		0x41
+#define SPFUNCTION_MORE_NOTIF_EXPECTED		0x01
+#define SPFUNCTION_DEVICE_LIST_EMPTY		0x02
+#define DEVICE_PAIRED_PARAM_SPFUNCTION		0x00
+#define DEVICE_PAIRED_PARAM_EQUAD_ID_LSB	0x01
+#define DEVICE_PAIRED_PARAM_EQUAD_ID_MSB	0x02
+#define DEVICE_PAIRED_RF_REPORT_TYPE		0x03
+
+/* Device Un-Paired Notification */
+#define REPORT_TYPE_NOTIF_DEVICE_UNPAIRED	0x40
+
+/* Connection Status Notification */
+#define REPORT_TYPE_NOTIF_CONNECTION_STATUS	0x42
+#define CONNECTION_STATUS_PARAM_STATUS		0x00
+#define STATUS_LINKLOSS				0x01
+
+/* Error Notification */
+#define REPORT_TYPE_NOTIF_ERROR			0x7F
+#define NOTIF_ERROR_PARAM_ETYPE			0x00
+#define ETYPE_KEEPALIVE_TIMEOUT			0x01
+
+/* supported DJ HID && RF report types */
+#define REPORT_TYPE_KEYBOARD			0x01
+#define REPORT_TYPE_MOUSE			0x02
+#define REPORT_TYPE_CONSUMER_CONTROL		0x03
+#define REPORT_TYPE_SYSTEM_CONTROL		0x04
+#define REPORT_TYPE_MEDIA_CENTER		0x08
+#define REPORT_TYPE_LEDS			0x0E
+
+/* RF Report types bitfield */
+#define STD_KEYBOARD				BIT(1)
+#define STD_MOUSE				BIT(2)
+#define MULTIMEDIA				BIT(3)
+#define POWER_KEYS				BIT(4)
+#define KBD_MOUSE				BIT(5)
+#define MEDIA_CENTER				BIT(8)
+#define KBD_LEDS				BIT(14)
+/* Fake (bitnr > NUMBER_OF_HID_REPORTS) bit to track HID++ capability */
+#define HIDPP					BIT_ULL(63)
+
+/* HID++ Device Connected Notification */
+#define REPORT_TYPE_NOTIF_DEVICE_CONNECTED	0x41
+#define HIDPP_PARAM_PROTO_TYPE			0x00
+#define HIDPP_PARAM_DEVICE_INFO			0x01
+#define HIDPP_PARAM_EQUAD_LSB			0x02
+#define HIDPP_PARAM_EQUAD_MSB			0x03
+#define HIDPP_PARAM_27MHZ_DEVID			0x03
+#define HIDPP_DEVICE_TYPE_MASK			GENMASK(3, 0)
+#define HIDPP_LINK_STATUS_MASK			BIT(6)
+#define HIDPP_MANUFACTURER_MASK			BIT(7)
+#define HIDPP_27MHZ_SECURE_MASK			BIT(7)
+
+#define HIDPP_DEVICE_TYPE_KEYBOARD		1
+#define HIDPP_DEVICE_TYPE_MOUSE			2
+
+#define HIDPP_SET_REGISTER			0x80
+#define HIDPP_GET_LONG_REGISTER			0x83
+#define HIDPP_REG_CONNECTION_STATE		0x02
+#define HIDPP_REG_PAIRING_INFORMATION		0xB5
+#define HIDPP_PAIRING_INFORMATION		0x20
+#define HIDPP_FAKE_DEVICE_ARRIVAL		0x02
+
+enum recvr_type {
+	recvr_type_dj,
+	recvr_type_hidpp,
+	recvr_type_gaming_hidpp,
+	recvr_type_mouse_only,
+	recvr_type_27mhz,
+	recvr_type_bluetooth,
+	recvr_type_dinovo,
+};
+
+struct dj_report {
+	u8 report_id;
+	u8 device_index;
+	u8 report_type;
+	u8 report_params[DJREPORT_SHORT_LENGTH - 3];
+};
+
+struct hidpp_event {
+	u8 report_id;
+	u8 device_index;
+	u8 sub_id;
+	u8 params[HIDPP_REPORT_LONG_LENGTH - 3U];
+} __packed;
+
+struct dj_receiver_dev {
+	struct hid_device *mouse;
+	struct hid_device *keyboard;
+	struct hid_device *hidpp;
+	struct dj_device *paired_dj_devices[DJ_MAX_PAIRED_DEVICES +
+					    DJ_DEVICE_INDEX_MIN];
+	struct list_head list;
+	struct kref kref;
+	struct work_struct work;
+	struct kfifo notif_fifo;
+	unsigned long last_query; /* in jiffies */
+	bool ready;
+	enum recvr_type type;
+	unsigned int unnumbered_application;
+	spinlock_t lock;
+};
+
+struct dj_device {
+	struct hid_device *hdev;
+	struct dj_receiver_dev *dj_receiver_dev;
+	u64 reports_supported;
+	u8 device_index;
+};
+
+#define WORKITEM_TYPE_EMPTY	0
+#define WORKITEM_TYPE_PAIRED	1
+#define WORKITEM_TYPE_UNPAIRED	2
+#define WORKITEM_TYPE_UNKNOWN	255
+
+struct dj_workitem {
+	u8 type;		/* WORKITEM_TYPE_* */
+	u8 device_index;
+	u8 device_type;
+	u8 quad_id_msb;
+	u8 quad_id_lsb;
+	u64 reports_supported;
+};
+
+/* Keyboard descriptor (1) */
+static const char kbd_descriptor[] = {
+	0x05, 0x01,		/* USAGE_PAGE (generic Desktop)     */
+	0x09, 0x06,		/* USAGE (Keyboard)         */
+	0xA1, 0x01,		/* COLLECTION (Application)     */
+	0x85, 0x01,		/* REPORT_ID (1)            */
+	0x95, 0x08,		/*   REPORT_COUNT (8)           */
+	0x75, 0x01,		/*   REPORT_SIZE (1)            */
+	0x15, 0x00,		/*   LOGICAL_MINIMUM (0)        */
+	0x25, 0x01,		/*   LOGICAL_MAXIMUM (1)        */
+	0x05, 0x07,		/*   USAGE_PAGE (Keyboard)      */
+	0x19, 0xE0,		/*   USAGE_MINIMUM (Left Control)   */
+	0x29, 0xE7,		/*   USAGE_MAXIMUM (Right GUI)      */
+	0x81, 0x02,		/*   INPUT (Data,Var,Abs)       */
+	0x95, 0x06,		/*   REPORT_COUNT (6)           */
+	0x75, 0x08,		/*   REPORT_SIZE (8)            */
+	0x15, 0x00,		/*   LOGICAL_MINIMUM (0)        */
+	0x26, 0xFF, 0x00,	/*   LOGICAL_MAXIMUM (255)      */
+	0x05, 0x07,		/*   USAGE_PAGE (Keyboard)      */
+	0x19, 0x00,		/*   USAGE_MINIMUM (no event)       */
+	0x2A, 0xFF, 0x00,	/*   USAGE_MAXIMUM (reserved)       */
+	0x81, 0x00,		/*   INPUT (Data,Ary,Abs)       */
+	0x85, 0x0e,		/* REPORT_ID (14)               */
+	0x05, 0x08,		/*   USAGE PAGE (LED page)      */
+	0x95, 0x05,		/*   REPORT COUNT (5)           */
+	0x75, 0x01,		/*   REPORT SIZE (1)            */
+	0x15, 0x00,		/*   LOGICAL_MINIMUM (0)        */
+	0x25, 0x01,		/*   LOGICAL_MAXIMUM (1)        */
+	0x19, 0x01,		/*   USAGE MINIMUM (1)          */
+	0x29, 0x05,		/*   USAGE MAXIMUM (5)          */
+	0x91, 0x02,		/*   OUTPUT (Data, Variable, Absolute)  */
+	0x95, 0x01,		/*   REPORT COUNT (1)           */
+	0x75, 0x03,		/*   REPORT SIZE (3)            */
+	0x91, 0x01,		/*   OUTPUT (Constant)          */
+	0xC0
+};
+
+/* Mouse descriptor (2)     */
+static const char mse_descriptor[] = {
+	0x05, 0x01,		/*  USAGE_PAGE (Generic Desktop)        */
+	0x09, 0x02,		/*  USAGE (Mouse)                       */
+	0xA1, 0x01,		/*  COLLECTION (Application)            */
+	0x85, 0x02,		/*    REPORT_ID = 2                     */
+	0x09, 0x01,		/*    USAGE (pointer)                   */
+	0xA1, 0x00,		/*    COLLECTION (physical)             */
+	0x05, 0x09,		/*      USAGE_PAGE (buttons)            */
+	0x19, 0x01,		/*      USAGE_MIN (1)                   */
+	0x29, 0x10,		/*      USAGE_MAX (16)                  */
+	0x15, 0x00,		/*      LOGICAL_MIN (0)                 */
+	0x25, 0x01,		/*      LOGICAL_MAX (1)                 */
+	0x95, 0x10,		/*      REPORT_COUNT (16)               */
+	0x75, 0x01,		/*      REPORT_SIZE (1)                 */
+	0x81, 0x02,		/*      INPUT (data var abs)            */
+	0x05, 0x01,		/*      USAGE_PAGE (generic desktop)    */
+	0x16, 0x01, 0xF8,	/*      LOGICAL_MIN (-2047)             */
+	0x26, 0xFF, 0x07,	/*      LOGICAL_MAX (2047)              */
+	0x75, 0x0C,		/*      REPORT_SIZE (12)                */
+	0x95, 0x02,		/*      REPORT_COUNT (2)                */
+	0x09, 0x30,		/*      USAGE (X)                       */
+	0x09, 0x31,		/*      USAGE (Y)                       */
+	0x81, 0x06,		/*      INPUT                           */
+	0x15, 0x81,		/*      LOGICAL_MIN (-127)              */
+	0x25, 0x7F,		/*      LOGICAL_MAX (127)               */
+	0x75, 0x08,		/*      REPORT_SIZE (8)                 */
+	0x95, 0x01,		/*      REPORT_COUNT (1)                */
+	0x09, 0x38,		/*      USAGE (wheel)                   */
+	0x81, 0x06,		/*      INPUT                           */
+	0x05, 0x0C,		/*      USAGE_PAGE(consumer)            */
+	0x0A, 0x38, 0x02,	/*      USAGE(AC Pan)                   */
+	0x95, 0x01,		/*      REPORT_COUNT (1)                */
+	0x81, 0x06,		/*      INPUT                           */
+	0xC0,			/*    END_COLLECTION                    */
+	0xC0,			/*  END_COLLECTION                      */
+};
+
+/* Mouse descriptor (2) for 27 MHz receiver, only 8 buttons */
+static const char mse_27mhz_descriptor[] = {
+	0x05, 0x01,		/*  USAGE_PAGE (Generic Desktop)        */
+	0x09, 0x02,		/*  USAGE (Mouse)                       */
+	0xA1, 0x01,		/*  COLLECTION (Application)            */
+	0x85, 0x02,		/*    REPORT_ID = 2                     */
+	0x09, 0x01,		/*    USAGE (pointer)                   */
+	0xA1, 0x00,		/*    COLLECTION (physical)             */
+	0x05, 0x09,		/*      USAGE_PAGE (buttons)            */
+	0x19, 0x01,		/*      USAGE_MIN (1)                   */
+	0x29, 0x08,		/*      USAGE_MAX (8)                   */
+	0x15, 0x00,		/*      LOGICAL_MIN (0)                 */
+	0x25, 0x01,		/*      LOGICAL_MAX (1)                 */
+	0x95, 0x08,		/*      REPORT_COUNT (8)                */
+	0x75, 0x01,		/*      REPORT_SIZE (1)                 */
+	0x81, 0x02,		/*      INPUT (data var abs)            */
+	0x05, 0x01,		/*      USAGE_PAGE (generic desktop)    */
+	0x16, 0x01, 0xF8,	/*      LOGICAL_MIN (-2047)             */
+	0x26, 0xFF, 0x07,	/*      LOGICAL_MAX (2047)              */
+	0x75, 0x0C,		/*      REPORT_SIZE (12)                */
+	0x95, 0x02,		/*      REPORT_COUNT (2)                */
+	0x09, 0x30,		/*      USAGE (X)                       */
+	0x09, 0x31,		/*      USAGE (Y)                       */
+	0x81, 0x06,		/*      INPUT                           */
+	0x15, 0x81,		/*      LOGICAL_MIN (-127)              */
+	0x25, 0x7F,		/*      LOGICAL_MAX (127)               */
+	0x75, 0x08,		/*      REPORT_SIZE (8)                 */
+	0x95, 0x01,		/*      REPORT_COUNT (1)                */
+	0x09, 0x38,		/*      USAGE (wheel)                   */
+	0x81, 0x06,		/*      INPUT                           */
+	0x05, 0x0C,		/*      USAGE_PAGE(consumer)            */
+	0x0A, 0x38, 0x02,	/*      USAGE(AC Pan)                   */
+	0x95, 0x01,		/*      REPORT_COUNT (1)                */
+	0x81, 0x06,		/*      INPUT                           */
+	0xC0,			/*    END_COLLECTION                    */
+	0xC0,			/*  END_COLLECTION                      */
+};
+
+/* Mouse descriptor (2) for Bluetooth receiver, low-res hwheel, 12 buttons */
+static const char mse_bluetooth_descriptor[] = {
+	0x05, 0x01,		/*  USAGE_PAGE (Generic Desktop)        */
+	0x09, 0x02,		/*  USAGE (Mouse)                       */
+	0xA1, 0x01,		/*  COLLECTION (Application)            */
+	0x85, 0x02,		/*    REPORT_ID = 2                     */
+	0x09, 0x01,		/*    USAGE (pointer)                   */
+	0xA1, 0x00,		/*    COLLECTION (physical)             */
+	0x05, 0x09,		/*      USAGE_PAGE (buttons)            */
+	0x19, 0x01,		/*      USAGE_MIN (1)                   */
+	0x29, 0x08,		/*      USAGE_MAX (8)                   */
+	0x15, 0x00,		/*      LOGICAL_MIN (0)                 */
+	0x25, 0x01,		/*      LOGICAL_MAX (1)                 */
+	0x95, 0x08,		/*      REPORT_COUNT (8)                */
+	0x75, 0x01,		/*      REPORT_SIZE (1)                 */
+	0x81, 0x02,		/*      INPUT (data var abs)            */
+	0x05, 0x01,		/*      USAGE_PAGE (generic desktop)    */
+	0x16, 0x01, 0xF8,	/*      LOGICAL_MIN (-2047)             */
+	0x26, 0xFF, 0x07,	/*      LOGICAL_MAX (2047)              */
+	0x75, 0x0C,		/*      REPORT_SIZE (12)                */
+	0x95, 0x02,		/*      REPORT_COUNT (2)                */
+	0x09, 0x30,		/*      USAGE (X)                       */
+	0x09, 0x31,		/*      USAGE (Y)                       */
+	0x81, 0x06,		/*      INPUT                           */
+	0x15, 0x81,		/*      LOGICAL_MIN (-127)              */
+	0x25, 0x7F,		/*      LOGICAL_MAX (127)               */
+	0x75, 0x08,		/*      REPORT_SIZE (8)                 */
+	0x95, 0x01,		/*      REPORT_COUNT (1)                */
+	0x09, 0x38,		/*      USAGE (wheel)                   */
+	0x81, 0x06,		/*      INPUT                           */
+	0x05, 0x0C,		/*      USAGE_PAGE(consumer)            */
+	0x0A, 0x38, 0x02,	/*      USAGE(AC Pan)                   */
+	0x15, 0xF9,		/*      LOGICAL_MIN (-7)                */
+	0x25, 0x07,		/*      LOGICAL_MAX (7)                 */
+	0x75, 0x04,		/*      REPORT_SIZE (4)                 */
+	0x95, 0x01,		/*      REPORT_COUNT (1)                */
+	0x81, 0x06,		/*      INPUT                           */
+	0x05, 0x09,		/*      USAGE_PAGE (buttons)            */
+	0x19, 0x09,		/*      USAGE_MIN (9)                   */
+	0x29, 0x0C,		/*      USAGE_MAX (12)                  */
+	0x15, 0x00,		/*      LOGICAL_MIN (0)                 */
+	0x25, 0x01,		/*      LOGICAL_MAX (1)                 */
+	0x75, 0x01,		/*      REPORT_SIZE (1)                 */
+	0x95, 0x04,		/*      REPORT_COUNT (4)                */
+	0x81, 0x02,		/*      INPUT (Data,Var,Abs)            */
+	0xC0,			/*    END_COLLECTION                    */
+	0xC0,			/*  END_COLLECTION                      */
+};
+
+/* Mouse descriptor (5) for Bluetooth receiver, normal-res hwheel, 8 buttons */
+static const char mse5_bluetooth_descriptor[] = {
+	0x05, 0x01,		/*  USAGE_PAGE (Generic Desktop)        */
+	0x09, 0x02,		/*  Usage (Mouse)                       */
+	0xa1, 0x01,		/*  Collection (Application)            */
+	0x85, 0x05,		/*   Report ID (5)                      */
+	0x09, 0x01,		/*   Usage (Pointer)                    */
+	0xa1, 0x00,		/*   Collection (Physical)              */
+	0x05, 0x09,		/*    Usage Page (Button)               */
+	0x19, 0x01,		/*    Usage Minimum (1)                 */
+	0x29, 0x08,		/*    Usage Maximum (8)                 */
+	0x15, 0x00,		/*    Logical Minimum (0)               */
+	0x25, 0x01,		/*    Logical Maximum (1)               */
+	0x95, 0x08,		/*    Report Count (8)                  */
+	0x75, 0x01,		/*    Report Size (1)                   */
+	0x81, 0x02,		/*    Input (Data,Var,Abs)              */
+	0x05, 0x01,		/*    Usage Page (Generic Desktop)      */
+	0x16, 0x01, 0xf8,	/*    Logical Minimum (-2047)           */
+	0x26, 0xff, 0x07,	/*    Logical Maximum (2047)            */
+	0x75, 0x0c,		/*    Report Size (12)                  */
+	0x95, 0x02,		/*    Report Count (2)                  */
+	0x09, 0x30,		/*    Usage (X)                         */
+	0x09, 0x31,		/*    Usage (Y)                         */
+	0x81, 0x06,		/*    Input (Data,Var,Rel)              */
+	0x15, 0x81,		/*    Logical Minimum (-127)            */
+	0x25, 0x7f,		/*    Logical Maximum (127)             */
+	0x75, 0x08,		/*    Report Size (8)                   */
+	0x95, 0x01,		/*    Report Count (1)                  */
+	0x09, 0x38,		/*    Usage (Wheel)                     */
+	0x81, 0x06,		/*    Input (Data,Var,Rel)              */
+	0x05, 0x0c,		/*    Usage Page (Consumer Devices)     */
+	0x0a, 0x38, 0x02,	/*    Usage (AC Pan)                    */
+	0x15, 0x81,		/*    Logical Minimum (-127)            */
+	0x25, 0x7f,		/*    Logical Maximum (127)             */
+	0x75, 0x08,		/*    Report Size (8)                   */
+	0x95, 0x01,		/*    Report Count (1)                  */
+	0x81, 0x06,		/*    Input (Data,Var,Rel)              */
+	0xc0,			/*   End Collection                     */
+	0xc0,			/*  End Collection                      */
+};
+
+/* Gaming Mouse descriptor (2) */
+static const char mse_high_res_descriptor[] = {
+	0x05, 0x01,		/*  USAGE_PAGE (Generic Desktop)        */
+	0x09, 0x02,		/*  USAGE (Mouse)                       */
+	0xA1, 0x01,		/*  COLLECTION (Application)            */
+	0x85, 0x02,		/*    REPORT_ID = 2                     */
+	0x09, 0x01,		/*    USAGE (pointer)                   */
+	0xA1, 0x00,		/*    COLLECTION (physical)             */
+	0x05, 0x09,		/*      USAGE_PAGE (buttons)            */
+	0x19, 0x01,		/*      USAGE_MIN (1)                   */
+	0x29, 0x10,		/*      USAGE_MAX (16)                  */
+	0x15, 0x00,		/*      LOGICAL_MIN (0)                 */
+	0x25, 0x01,		/*      LOGICAL_MAX (1)                 */
+	0x95, 0x10,		/*      REPORT_COUNT (16)               */
+	0x75, 0x01,		/*      REPORT_SIZE (1)                 */
+	0x81, 0x02,		/*      INPUT (data var abs)            */
+	0x05, 0x01,		/*      USAGE_PAGE (generic desktop)    */
+	0x16, 0x01, 0x80,	/*      LOGICAL_MIN (-32767)            */
+	0x26, 0xFF, 0x7F,	/*      LOGICAL_MAX (32767)             */
+	0x75, 0x10,		/*      REPORT_SIZE (16)                */
+	0x95, 0x02,		/*      REPORT_COUNT (2)                */
+	0x09, 0x30,		/*      USAGE (X)                       */
+	0x09, 0x31,		/*      USAGE (Y)                       */
+	0x81, 0x06,		/*      INPUT                           */
+	0x15, 0x81,		/*      LOGICAL_MIN (-127)              */
+	0x25, 0x7F,		/*      LOGICAL_MAX (127)               */
+	0x75, 0x08,		/*      REPORT_SIZE (8)                 */
+	0x95, 0x01,		/*      REPORT_COUNT (1)                */
+	0x09, 0x38,		/*      USAGE (wheel)                   */
+	0x81, 0x06,		/*      INPUT                           */
+	0x05, 0x0C,		/*      USAGE_PAGE(consumer)            */
+	0x0A, 0x38, 0x02,	/*      USAGE(AC Pan)                   */
+	0x95, 0x01,		/*      REPORT_COUNT (1)                */
+	0x81, 0x06,		/*      INPUT                           */
+	0xC0,			/*    END_COLLECTION                    */
+	0xC0,			/*  END_COLLECTION                      */
+};
+
+/* Consumer Control descriptor (3) */
+static const char consumer_descriptor[] = {
+	0x05, 0x0C,		/* USAGE_PAGE (Consumer Devices)       */
+	0x09, 0x01,		/* USAGE (Consumer Control)            */
+	0xA1, 0x01,		/* COLLECTION (Application)            */
+	0x85, 0x03,		/* REPORT_ID = 3                       */
+	0x75, 0x10,		/* REPORT_SIZE (16)                    */
+	0x95, 0x02,		/* REPORT_COUNT (2)                    */
+	0x15, 0x01,		/* LOGICAL_MIN (1)                     */
+	0x26, 0xFF, 0x02,	/* LOGICAL_MAX (767)                   */
+	0x19, 0x01,		/* USAGE_MIN (1)                       */
+	0x2A, 0xFF, 0x02,	/* USAGE_MAX (767)                     */
+	0x81, 0x00,		/* INPUT (Data Ary Abs)                */
+	0xC0,			/* END_COLLECTION                      */
+};				/*                                     */
+
+/* System control descriptor (4) */
+static const char syscontrol_descriptor[] = {
+	0x05, 0x01,		/*   USAGE_PAGE (Generic Desktop)      */
+	0x09, 0x80,		/*   USAGE (System Control)            */
+	0xA1, 0x01,		/*   COLLECTION (Application)          */
+	0x85, 0x04,		/*   REPORT_ID = 4                     */
+	0x75, 0x02,		/*   REPORT_SIZE (2)                   */
+	0x95, 0x01,		/*   REPORT_COUNT (1)                  */
+	0x15, 0x01,		/*   LOGICAL_MIN (1)                   */
+	0x25, 0x03,		/*   LOGICAL_MAX (3)                   */
+	0x09, 0x82,		/*   USAGE (System Sleep)              */
+	0x09, 0x81,		/*   USAGE (System Power Down)         */
+	0x09, 0x83,		/*   USAGE (System Wake Up)            */
+	0x81, 0x60,		/*   INPUT (Data Ary Abs NPrf Null)    */
+	0x75, 0x06,		/*   REPORT_SIZE (6)                   */
+	0x81, 0x03,		/*   INPUT (Cnst Var Abs)              */
+	0xC0,			/*   END_COLLECTION                    */
+};
+
+/* Media descriptor (8) */
+static const char media_descriptor[] = {
+	0x06, 0xbc, 0xff,	/* Usage Page 0xffbc                   */
+	0x09, 0x88,		/* Usage 0x0088                        */
+	0xa1, 0x01,		/* BeginCollection                     */
+	0x85, 0x08,		/*   Report ID 8                       */
+	0x19, 0x01,		/*   Usage Min 0x0001                  */
+	0x29, 0xff,		/*   Usage Max 0x00ff                  */
+	0x15, 0x01,		/*   Logical Min 1                     */
+	0x26, 0xff, 0x00,	/*   Logical Max 255                   */
+	0x75, 0x08,		/*   Report Size 8                     */
+	0x95, 0x01,		/*   Report Count 1                    */
+	0x81, 0x00,		/*   Input                             */
+	0xc0,			/* EndCollection                       */
+};				/*                                     */
+
+/* HIDPP descriptor */
+static const char hidpp_descriptor[] = {
+	0x06, 0x00, 0xff,	/* Usage Page (Vendor Defined Page 1)  */
+	0x09, 0x01,		/* Usage (Vendor Usage 1)              */
+	0xa1, 0x01,		/* Collection (Application)            */
+	0x85, 0x10,		/*   Report ID (16)                    */
+	0x75, 0x08,		/*   Report Size (8)                   */
+	0x95, 0x06,		/*   Report Count (6)                  */
+	0x15, 0x00,		/*   Logical Minimum (0)               */
+	0x26, 0xff, 0x00,	/*   Logical Maximum (255)             */
+	0x09, 0x01,		/*   Usage (Vendor Usage 1)            */
+	0x81, 0x00,		/*   Input (Data,Arr,Abs)              */
+	0x09, 0x01,		/*   Usage (Vendor Usage 1)            */
+	0x91, 0x00,		/*   Output (Data,Arr,Abs)             */
+	0xc0,			/* End Collection                      */
+	0x06, 0x00, 0xff,	/* Usage Page (Vendor Defined Page 1)  */
+	0x09, 0x02,		/* Usage (Vendor Usage 2)              */
+	0xa1, 0x01,		/* Collection (Application)            */
+	0x85, 0x11,		/*   Report ID (17)                    */
+	0x75, 0x08,		/*   Report Size (8)                   */
+	0x95, 0x13,		/*   Report Count (19)                 */
+	0x15, 0x00,		/*   Logical Minimum (0)               */
+	0x26, 0xff, 0x00,	/*   Logical Maximum (255)             */
+	0x09, 0x02,		/*   Usage (Vendor Usage 2)            */
+	0x81, 0x00,		/*   Input (Data,Arr,Abs)              */
+	0x09, 0x02,		/*   Usage (Vendor Usage 2)            */
+	0x91, 0x00,		/*   Output (Data,Arr,Abs)             */
+	0xc0,			/* End Collection                      */
+	0x06, 0x00, 0xff,	/* Usage Page (Vendor Defined Page 1)  */
+	0x09, 0x04,		/* Usage (Vendor Usage 0x04)           */
+	0xa1, 0x01,		/* Collection (Application)            */
+	0x85, 0x20,		/*   Report ID (32)                    */
+	0x75, 0x08,		/*   Report Size (8)                   */
+	0x95, 0x0e,		/*   Report Count (14)                 */
+	0x15, 0x00,		/*   Logical Minimum (0)               */
+	0x26, 0xff, 0x00,	/*   Logical Maximum (255)             */
+	0x09, 0x41,		/*   Usage (Vendor Usage 0x41)         */
+	0x81, 0x00,		/*   Input (Data,Arr,Abs)              */
+	0x09, 0x41,		/*   Usage (Vendor Usage 0x41)         */
+	0x91, 0x00,		/*   Output (Data,Arr,Abs)             */
+	0x85, 0x21,		/*   Report ID (33)                    */
+	0x95, 0x1f,		/*   Report Count (31)                 */
+	0x15, 0x00,		/*   Logical Minimum (0)               */
+	0x26, 0xff, 0x00,	/*   Logical Maximum (255)             */
+	0x09, 0x42,		/*   Usage (Vendor Usage 0x42)         */
+	0x81, 0x00,		/*   Input (Data,Arr,Abs)              */
+	0x09, 0x42,		/*   Usage (Vendor Usage 0x42)         */
+	0x91, 0x00,		/*   Output (Data,Arr,Abs)             */
+	0xc0,			/* End Collection                      */
+};
+
+/* Maximum size of all defined hid reports in bytes (including report id) */
+#define MAX_REPORT_SIZE 8
+
+/* Make sure all descriptors are present here */
+#define MAX_RDESC_SIZE				\
+	(sizeof(kbd_descriptor) +		\
+	 sizeof(mse_bluetooth_descriptor) +	\
+	 sizeof(mse5_bluetooth_descriptor) +	\
+	 sizeof(consumer_descriptor) +		\
+	 sizeof(syscontrol_descriptor) +	\
+	 sizeof(media_descriptor) +	\
+	 sizeof(hidpp_descriptor))
+
+/* Number of possible hid report types that can be created by this driver.
+ *
+ * Right now, RF report types have the same report types (or report id's)
+ * than the hid report created from those RF reports. In the future
+ * this doesnt have to be true.
+ *
+ * For instance, RF report type 0x01 which has a size of 8 bytes, corresponds
+ * to hid report id 0x01, this is standard keyboard. Same thing applies to mice
+ * reports and consumer control, etc. If a new RF report is created, it doesn't
+ * has to have the same report id as its corresponding hid report, so an
+ * translation may have to take place for future report types.
+ */
+#define NUMBER_OF_HID_REPORTS 32
+static const u8 hid_reportid_size_map[NUMBER_OF_HID_REPORTS] = {
+	[1] = 8,		/* Standard keyboard */
+	[2] = 8,		/* Standard mouse */
+	[3] = 5,		/* Consumer control */
+	[4] = 2,		/* System control */
+	[8] = 2,		/* Media Center */
+};
+
+
+#define LOGITECH_DJ_INTERFACE_NUMBER 0x02
+
+static struct hid_ll_driver logi_dj_ll_driver;
+
+static int logi_dj_recv_query_paired_devices(struct dj_receiver_dev *djrcv_dev);
+static void delayedwork_callback(struct work_struct *work);
+
+static LIST_HEAD(dj_hdev_list);
+static DEFINE_MUTEX(dj_hdev_list_lock);
+
+static bool recvr_type_is_bluetooth(enum recvr_type type)
+{
+	return type == recvr_type_bluetooth || type == recvr_type_dinovo;
+}
+
+/*
+ * dj/HID++ receivers are really a single logical entity, but for BIOS/Windows
+ * compatibility they have multiple USB interfaces. On HID++ receivers we need
+ * to listen for input reports on both interfaces. The functions below are used
+ * to create a single struct dj_receiver_dev for all interfaces belonging to
+ * a single USB-device / receiver.
+ */
+static struct dj_receiver_dev *dj_find_receiver_dev(struct hid_device *hdev,
+						    enum recvr_type type)
+{
+	struct dj_receiver_dev *djrcv_dev;
+	char sep;
+
+	/*
+	 * The bluetooth receiver contains a built-in hub and has separate
+	 * USB-devices for the keyboard and mouse interfaces.
+	 */
+	sep = recvr_type_is_bluetooth(type) ? '.' : '/';
+
+	/* Try to find an already-probed interface from the same device */
+	list_for_each_entry(djrcv_dev, &dj_hdev_list, list) {
+		if (djrcv_dev->mouse &&
+		    hid_compare_device_paths(hdev, djrcv_dev->mouse, sep)) {
+			kref_get(&djrcv_dev->kref);
+			return djrcv_dev;
+		}
+		if (djrcv_dev->keyboard &&
+		    hid_compare_device_paths(hdev, djrcv_dev->keyboard, sep)) {
+			kref_get(&djrcv_dev->kref);
+			return djrcv_dev;
+		}
+		if (djrcv_dev->hidpp &&
+		    hid_compare_device_paths(hdev, djrcv_dev->hidpp, sep)) {
+			kref_get(&djrcv_dev->kref);
+			return djrcv_dev;
+		}
+	}
+
+	return NULL;
+}
+
+static void dj_release_receiver_dev(struct kref *kref)
+{
+	struct dj_receiver_dev *djrcv_dev = container_of(kref, struct dj_receiver_dev, kref);
+
+	list_del(&djrcv_dev->list);
+	kfifo_free(&djrcv_dev->notif_fifo);
+	kfree(djrcv_dev);
+}
+
+static void dj_put_receiver_dev(struct hid_device *hdev)
+{
+	struct dj_receiver_dev *djrcv_dev = hid_get_drvdata(hdev);
+
+	mutex_lock(&dj_hdev_list_lock);
+
+	if (djrcv_dev->mouse == hdev)
+		djrcv_dev->mouse = NULL;
+	if (djrcv_dev->keyboard == hdev)
+		djrcv_dev->keyboard = NULL;
+	if (djrcv_dev->hidpp == hdev)
+		djrcv_dev->hidpp = NULL;
+
+	kref_put(&djrcv_dev->kref, dj_release_receiver_dev);
+
+	mutex_unlock(&dj_hdev_list_lock);
+}
+
+static struct dj_receiver_dev *dj_get_receiver_dev(struct hid_device *hdev,
+						   enum recvr_type type,
+						   unsigned int application,
+						   bool is_hidpp)
+{
+	struct dj_receiver_dev *djrcv_dev;
+
+	mutex_lock(&dj_hdev_list_lock);
+
+	djrcv_dev = dj_find_receiver_dev(hdev, type);
+	if (!djrcv_dev) {
+		djrcv_dev = kzalloc(sizeof(*djrcv_dev), GFP_KERNEL);
+		if (!djrcv_dev)
+			goto out;
+
+		INIT_WORK(&djrcv_dev->work, delayedwork_callback);
+		spin_lock_init(&djrcv_dev->lock);
+		if (kfifo_alloc(&djrcv_dev->notif_fifo,
+			    DJ_MAX_NUMBER_NOTIFS * sizeof(struct dj_workitem),
+			    GFP_KERNEL)) {
+			kfree(djrcv_dev);
+			djrcv_dev = NULL;
+			goto out;
+		}
+		kref_init(&djrcv_dev->kref);
+		list_add_tail(&djrcv_dev->list, &dj_hdev_list);
+		djrcv_dev->last_query = jiffies;
+		djrcv_dev->type = type;
+	}
+
+	if (application == HID_GD_KEYBOARD)
+		djrcv_dev->keyboard = hdev;
+	if (application == HID_GD_MOUSE)
+		djrcv_dev->mouse = hdev;
+	if (is_hidpp)
+		djrcv_dev->hidpp = hdev;
+
+	hid_set_drvdata(hdev, djrcv_dev);
+out:
+	mutex_unlock(&dj_hdev_list_lock);
+	return djrcv_dev;
+}
+
+static void logi_dj_recv_destroy_djhid_device(struct dj_receiver_dev *djrcv_dev,
+					      struct dj_workitem *workitem)
+{
+	/* Called in delayed work context */
+	struct dj_device *dj_dev;
+	unsigned long flags;
+
+	spin_lock_irqsave(&djrcv_dev->lock, flags);
+	dj_dev = djrcv_dev->paired_dj_devices[workitem->device_index];
+	djrcv_dev->paired_dj_devices[workitem->device_index] = NULL;
+	spin_unlock_irqrestore(&djrcv_dev->lock, flags);
+
+	if (dj_dev != NULL) {
+		hid_destroy_device(dj_dev->hdev);
+		kfree(dj_dev);
+	} else {
+		hid_err(djrcv_dev->hidpp, "%s: can't destroy a NULL device\n",
+			__func__);
+	}
+}
+
+static void logi_dj_recv_add_djhid_device(struct dj_receiver_dev *djrcv_dev,
+					  struct dj_workitem *workitem)
+{
+	/* Called in delayed work context */
+	struct hid_device *djrcv_hdev = djrcv_dev->hidpp;
+	struct hid_device *dj_hiddev;
+	struct dj_device *dj_dev;
+	u8 device_index = workitem->device_index;
+	unsigned long flags;
+
+	/* Device index goes from 1 to 6, we need 3 bytes to store the
+	 * semicolon, the index, and a null terminator
+	 */
+	unsigned char tmpstr[3];
+
+	/* We are the only one ever adding a device, no need to lock */
+	if (djrcv_dev->paired_dj_devices[device_index]) {
+		/* The device is already known. No need to reallocate it. */
+		dbg_hid("%s: device is already known\n", __func__);
+		return;
+	}
+
+	dj_hiddev = hid_allocate_device();
+	if (IS_ERR(dj_hiddev)) {
+		hid_err(djrcv_hdev, "%s: hid_allocate_dev failed\n", __func__);
+		return;
+	}
+
+	dj_hiddev->ll_driver = &logi_dj_ll_driver;
+
+	dj_hiddev->dev.parent = &djrcv_hdev->dev;
+	dj_hiddev->bus = BUS_USB;
+	dj_hiddev->vendor = djrcv_hdev->vendor;
+	dj_hiddev->product = (workitem->quad_id_msb << 8) |
+			      workitem->quad_id_lsb;
+	if (workitem->device_type) {
+		const char *type_str = "Device";
+
+		switch (workitem->device_type) {
+		case 0x01: type_str = "Keyboard";	break;
+		case 0x02: type_str = "Mouse";		break;
+		case 0x03: type_str = "Numpad";		break;
+		case 0x04: type_str = "Presenter";	break;
+		case 0x07: type_str = "Remote Control";	break;
+		case 0x08: type_str = "Trackball";	break;
+		case 0x09: type_str = "Touchpad";	break;
+		}
+		snprintf(dj_hiddev->name, sizeof(dj_hiddev->name),
+			"Logitech Wireless %s PID:%04x",
+			type_str, dj_hiddev->product);
+	} else {
+		snprintf(dj_hiddev->name, sizeof(dj_hiddev->name),
+			"Logitech Wireless Device PID:%04x",
+			dj_hiddev->product);
+	}
+
+	if (djrcv_dev->type == recvr_type_27mhz)
+		dj_hiddev->group = HID_GROUP_LOGITECH_27MHZ_DEVICE;
+	else
+		dj_hiddev->group = HID_GROUP_LOGITECH_DJ_DEVICE;
+
+	memcpy(dj_hiddev->phys, djrcv_hdev->phys, sizeof(djrcv_hdev->phys));
+	snprintf(tmpstr, sizeof(tmpstr), ":%d", device_index);
+	strlcat(dj_hiddev->phys, tmpstr, sizeof(dj_hiddev->phys));
+
+	dj_dev = kzalloc(sizeof(struct dj_device), GFP_KERNEL);
+
+	if (!dj_dev) {
+		hid_err(djrcv_hdev, "%s: failed allocating dj_dev\n", __func__);
+		goto dj_device_allocate_fail;
+	}
+
+	dj_dev->reports_supported = workitem->reports_supported;
+	dj_dev->hdev = dj_hiddev;
+	dj_dev->dj_receiver_dev = djrcv_dev;
+	dj_dev->device_index = device_index;
+	dj_hiddev->driver_data = dj_dev;
+
+	spin_lock_irqsave(&djrcv_dev->lock, flags);
+	djrcv_dev->paired_dj_devices[device_index] = dj_dev;
+	spin_unlock_irqrestore(&djrcv_dev->lock, flags);
+
+	if (hid_add_device(dj_hiddev)) {
+		hid_err(djrcv_hdev, "%s: failed adding dj_device\n", __func__);
+		goto hid_add_device_fail;
+	}
+
+	return;
+
+hid_add_device_fail:
+	spin_lock_irqsave(&djrcv_dev->lock, flags);
+	djrcv_dev->paired_dj_devices[device_index] = NULL;
+	spin_unlock_irqrestore(&djrcv_dev->lock, flags);
+	kfree(dj_dev);
+dj_device_allocate_fail:
+	hid_destroy_device(dj_hiddev);
+}
+
+static void delayedwork_callback(struct work_struct *work)
+{
+	struct dj_receiver_dev *djrcv_dev =
+		container_of(work, struct dj_receiver_dev, work);
+
+	struct dj_workitem workitem;
+	unsigned long flags;
+	int count;
+	int retval;
+
+	dbg_hid("%s\n", __func__);
+
+	spin_lock_irqsave(&djrcv_dev->lock, flags);
+
+	/*
+	 * Since we attach to multiple interfaces, we may get scheduled before
+	 * we are bound to the HID++ interface, catch this.
+	 */
+	if (!djrcv_dev->ready) {
+		pr_warn("%s: delayedwork queued before hidpp interface was enumerated\n",
+			__func__);
+		spin_unlock_irqrestore(&djrcv_dev->lock, flags);
+		return;
+	}
+
+	count = kfifo_out(&djrcv_dev->notif_fifo, &workitem, sizeof(workitem));
+
+	if (count != sizeof(workitem)) {
+		spin_unlock_irqrestore(&djrcv_dev->lock, flags);
+		return;
+	}
+
+	if (!kfifo_is_empty(&djrcv_dev->notif_fifo))
+		schedule_work(&djrcv_dev->work);
+
+	spin_unlock_irqrestore(&djrcv_dev->lock, flags);
+
+	switch (workitem.type) {
+	case WORKITEM_TYPE_PAIRED:
+		logi_dj_recv_add_djhid_device(djrcv_dev, &workitem);
+		break;
+	case WORKITEM_TYPE_UNPAIRED:
+		logi_dj_recv_destroy_djhid_device(djrcv_dev, &workitem);
+		break;
+	case WORKITEM_TYPE_UNKNOWN:
+		retval = logi_dj_recv_query_paired_devices(djrcv_dev);
+		if (retval) {
+			hid_err(djrcv_dev->hidpp, "%s: logi_dj_recv_query_paired_devices error: %d\n",
+				__func__, retval);
+		}
+		break;
+	case WORKITEM_TYPE_EMPTY:
+		dbg_hid("%s: device list is empty\n", __func__);
+		break;
+	}
+}
+
+/*
+ * Sometimes we receive reports for which we do not have a paired dj_device
+ * associated with the device_index or report-type to forward the report to.
+ * This means that the original "device paired" notification corresponding
+ * to the dj_device never arrived to this driver. Possible reasons for this are:
+ * 1) hid-core discards all packets coming from a device during probe().
+ * 2) if the receiver is plugged into a KVM switch then the pairing reports
+ * are only forwarded to it if the focus is on this PC.
+ * This function deals with this by re-asking the receiver for the list of
+ * connected devices in the delayed work callback.
+ * This function MUST be called with djrcv->lock held.
+ */
+static void logi_dj_recv_queue_unknown_work(struct dj_receiver_dev *djrcv_dev)
+{
+	struct dj_workitem workitem = { .type = WORKITEM_TYPE_UNKNOWN };
+
+	/* Rate limit queries done because of unhandled reports to 2/sec */
+	if (time_before(jiffies, djrcv_dev->last_query + HZ / 2))
+		return;
+
+	kfifo_in(&djrcv_dev->notif_fifo, &workitem, sizeof(workitem));
+	schedule_work(&djrcv_dev->work);
+}
+
+static void logi_dj_recv_queue_notification(struct dj_receiver_dev *djrcv_dev,
+					   struct dj_report *dj_report)
+{
+	/* We are called from atomic context (tasklet && djrcv->lock held) */
+	struct dj_workitem workitem = {
+		.device_index = dj_report->device_index,
+	};
+
+	switch (dj_report->report_type) {
+	case REPORT_TYPE_NOTIF_DEVICE_PAIRED:
+		workitem.type = WORKITEM_TYPE_PAIRED;
+		if (dj_report->report_params[DEVICE_PAIRED_PARAM_SPFUNCTION] &
+		    SPFUNCTION_DEVICE_LIST_EMPTY) {
+			workitem.type = WORKITEM_TYPE_EMPTY;
+			break;
+		}
+		fallthrough;
+	case REPORT_TYPE_NOTIF_DEVICE_UNPAIRED:
+		workitem.quad_id_msb =
+			dj_report->report_params[DEVICE_PAIRED_PARAM_EQUAD_ID_MSB];
+		workitem.quad_id_lsb =
+			dj_report->report_params[DEVICE_PAIRED_PARAM_EQUAD_ID_LSB];
+		workitem.reports_supported = get_unaligned_le32(
+						dj_report->report_params +
+						DEVICE_PAIRED_RF_REPORT_TYPE);
+		workitem.reports_supported |= HIDPP;
+		if (dj_report->report_type == REPORT_TYPE_NOTIF_DEVICE_UNPAIRED)
+			workitem.type = WORKITEM_TYPE_UNPAIRED;
+		break;
+	default:
+		logi_dj_recv_queue_unknown_work(djrcv_dev);
+		return;
+	}
+
+	kfifo_in(&djrcv_dev->notif_fifo, &workitem, sizeof(workitem));
+	schedule_work(&djrcv_dev->work);
+}
+
+/*
+ * Some quad/bluetooth keyboards have a builtin touchpad in this case we see
+ * only 1 paired device with a device_type of REPORT_TYPE_KEYBOARD. For the
+ * touchpad to work we must also forward mouse input reports to the dj_hiddev
+ * created for the keyboard (instead of forwarding them to a second paired
+ * device with a device_type of REPORT_TYPE_MOUSE as we normally would).
+ *
+ * On Dinovo receivers the keyboard's touchpad and an optional paired actual
+ * mouse send separate input reports, INPUT(2) aka STD_MOUSE for the mouse
+ * and INPUT(5) aka KBD_MOUSE for the keyboard's touchpad.
+ *
+ * On MX5x00 receivers (which can also be paired with a Dinovo keyboard)
+ * INPUT(2) is used for both an optional paired actual mouse and for the
+ * keyboard's touchpad.
+ */
+static const u16 kbd_builtin_touchpad_ids[] = {
+	0xb309, /* Dinovo Edge */
+	0xb30c, /* Dinovo Mini */
+};
+
+static void logi_hidpp_dev_conn_notif_equad(struct hid_device *hdev,
+					    struct hidpp_event *hidpp_report,
+					    struct dj_workitem *workitem)
+{
+	struct dj_receiver_dev *djrcv_dev = hid_get_drvdata(hdev);
+	int i, id;
+
+	workitem->type = WORKITEM_TYPE_PAIRED;
+	workitem->device_type = hidpp_report->params[HIDPP_PARAM_DEVICE_INFO] &
+				HIDPP_DEVICE_TYPE_MASK;
+	workitem->quad_id_msb = hidpp_report->params[HIDPP_PARAM_EQUAD_MSB];
+	workitem->quad_id_lsb = hidpp_report->params[HIDPP_PARAM_EQUAD_LSB];
+	switch (workitem->device_type) {
+	case REPORT_TYPE_KEYBOARD:
+		workitem->reports_supported |= STD_KEYBOARD | MULTIMEDIA |
+					       POWER_KEYS | MEDIA_CENTER |
+					       HIDPP;
+		id = (workitem->quad_id_msb << 8) | workitem->quad_id_lsb;
+		for (i = 0; i < ARRAY_SIZE(kbd_builtin_touchpad_ids); i++) {
+			if (id == kbd_builtin_touchpad_ids[i]) {
+				if (djrcv_dev->type == recvr_type_dinovo)
+					workitem->reports_supported |= KBD_MOUSE;
+				else
+					workitem->reports_supported |= STD_MOUSE;
+				break;
+			}
+		}
+		break;
+	case REPORT_TYPE_MOUSE:
+		workitem->reports_supported |= STD_MOUSE | HIDPP;
+		if (djrcv_dev->type == recvr_type_mouse_only)
+			workitem->reports_supported |= MULTIMEDIA;
+		break;
+	}
+}
+
+static void logi_hidpp_dev_conn_notif_27mhz(struct hid_device *hdev,
+					    struct hidpp_event *hidpp_report,
+					    struct dj_workitem *workitem)
+{
+	workitem->type = WORKITEM_TYPE_PAIRED;
+	workitem->quad_id_lsb = hidpp_report->params[HIDPP_PARAM_27MHZ_DEVID];
+	switch (hidpp_report->device_index) {
+	case 1: /* Index 1 is always a mouse */
+	case 2: /* Index 2 is always a mouse */
+		workitem->device_type = HIDPP_DEVICE_TYPE_MOUSE;
+		workitem->reports_supported |= STD_MOUSE | HIDPP;
+		break;
+	case 3: /* Index 3 is always the keyboard */
+		if (hidpp_report->params[HIDPP_PARAM_DEVICE_INFO] & HIDPP_27MHZ_SECURE_MASK) {
+			hid_info(hdev, "Keyboard connection is encrypted\n");
+		} else {
+			hid_warn(hdev, "Keyboard events are send over the air in plain-text / unencrypted\n");
+			hid_warn(hdev, "See: https://gitlab.freedesktop.org/jwrdegoede/logitech-27mhz-keyboard-encryption-setup/\n");
+		}
+		fallthrough;
+	case 4: /* Index 4 is used for an optional separate numpad */
+		workitem->device_type = HIDPP_DEVICE_TYPE_KEYBOARD;
+		workitem->reports_supported |= STD_KEYBOARD | MULTIMEDIA |
+					       POWER_KEYS | HIDPP;
+		break;
+	default:
+		hid_warn(hdev, "%s: unexpected device-index %d", __func__,
+			 hidpp_report->device_index);
+	}
+}
+
+static void logi_hidpp_recv_queue_notif(struct hid_device *hdev,
+					struct hidpp_event *hidpp_report)
+{
+	/* We are called from atomic context (tasklet && djrcv->lock held) */
+	struct dj_receiver_dev *djrcv_dev = hid_get_drvdata(hdev);
+	const char *device_type = "UNKNOWN";
+	struct dj_workitem workitem = {
+		.type = WORKITEM_TYPE_EMPTY,
+		.device_index = hidpp_report->device_index,
+	};
+
+	switch (hidpp_report->params[HIDPP_PARAM_PROTO_TYPE]) {
+	case 0x01:
+		device_type = "Bluetooth";
+		/* Bluetooth connect packet contents is the same as (e)QUAD */
+		logi_hidpp_dev_conn_notif_equad(hdev, hidpp_report, &workitem);
+		if (!(hidpp_report->params[HIDPP_PARAM_DEVICE_INFO] &
+						HIDPP_MANUFACTURER_MASK)) {
+			hid_info(hdev, "Non Logitech device connected on slot %d\n",
+				 hidpp_report->device_index);
+			workitem.reports_supported &= ~HIDPP;
+		}
+		break;
+	case 0x02:
+		device_type = "27 Mhz";
+		logi_hidpp_dev_conn_notif_27mhz(hdev, hidpp_report, &workitem);
+		break;
+	case 0x03:
+		device_type = "QUAD or eQUAD";
+		logi_hidpp_dev_conn_notif_equad(hdev, hidpp_report, &workitem);
+		break;
+	case 0x04:
+		device_type = "eQUAD step 4 DJ";
+		logi_hidpp_dev_conn_notif_equad(hdev, hidpp_report, &workitem);
+		break;
+	case 0x05:
+		device_type = "DFU Lite";
+		break;
+	case 0x06:
+		device_type = "eQUAD step 4 Lite";
+		logi_hidpp_dev_conn_notif_equad(hdev, hidpp_report, &workitem);
+		break;
+	case 0x07:
+		device_type = "eQUAD step 4 Gaming";
+		logi_hidpp_dev_conn_notif_equad(hdev, hidpp_report, &workitem);
+		workitem.reports_supported |= STD_KEYBOARD;
+		break;
+	case 0x08:
+		device_type = "eQUAD step 4 for gamepads";
+		break;
+	case 0x0a:
+		device_type = "eQUAD nano Lite";
+		logi_hidpp_dev_conn_notif_equad(hdev, hidpp_report, &workitem);
+		break;
+	case 0x0c:
+		device_type = "eQUAD Lightspeed 1";
+		logi_hidpp_dev_conn_notif_equad(hdev, hidpp_report, &workitem);
+		workitem.reports_supported |= STD_KEYBOARD;
+		break;
+	case 0x0d:
+		device_type = "eQUAD Lightspeed 1.1";
+		logi_hidpp_dev_conn_notif_equad(hdev, hidpp_report, &workitem);
+		workitem.reports_supported |= STD_KEYBOARD;
+		break;
+	case 0x0f:
+	case 0x11:
+		device_type = "eQUAD Lightspeed 1.2";
+		logi_hidpp_dev_conn_notif_equad(hdev, hidpp_report, &workitem);
+		workitem.reports_supported |= STD_KEYBOARD;
+		break;
+	}
+
+	/* custom receiver device (eg. powerplay) */
+	if (hidpp_report->device_index == 7) {
+		workitem.reports_supported |= HIDPP;
+	}
+
+	if (workitem.type == WORKITEM_TYPE_EMPTY) {
+		hid_warn(hdev,
+			 "unusable device of type %s (0x%02x) connected on slot %d",
+			 device_type,
+			 hidpp_report->params[HIDPP_PARAM_PROTO_TYPE],
+			 hidpp_report->device_index);
+		return;
+	}
+
+	hid_info(hdev, "device of type %s (0x%02x) connected on slot %d",
+		 device_type, hidpp_report->params[HIDPP_PARAM_PROTO_TYPE],
+		 hidpp_report->device_index);
+
+	kfifo_in(&djrcv_dev->notif_fifo, &workitem, sizeof(workitem));
+	schedule_work(&djrcv_dev->work);
+}
+
+static void logi_dj_recv_forward_null_report(struct dj_receiver_dev *djrcv_dev,
+					     struct dj_report *dj_report)
+{
+	/* We are called from atomic context (tasklet && djrcv->lock held) */
+	unsigned int i;
+	u8 reportbuffer[MAX_REPORT_SIZE];
+	struct dj_device *djdev;
+
+	djdev = djrcv_dev->paired_dj_devices[dj_report->device_index];
+
+	memset(reportbuffer, 0, sizeof(reportbuffer));
+
+	for (i = 0; i < NUMBER_OF_HID_REPORTS; i++) {
+		if (djdev->reports_supported & (1 << i)) {
+			reportbuffer[0] = i;
+			if (hid_input_report(djdev->hdev,
+					     HID_INPUT_REPORT,
+					     reportbuffer,
+					     hid_reportid_size_map[i], 1)) {
+				dbg_hid("hid_input_report error sending null "
+					"report\n");
+			}
+		}
+	}
+}
+
+static void logi_dj_recv_forward_dj(struct dj_receiver_dev *djrcv_dev,
+				    struct dj_report *dj_report)
+{
+	/* We are called from atomic context (tasklet && djrcv->lock held) */
+	struct dj_device *dj_device;
+
+	dj_device = djrcv_dev->paired_dj_devices[dj_report->device_index];
+
+	if ((dj_report->report_type > ARRAY_SIZE(hid_reportid_size_map) - 1) ||
+	    (hid_reportid_size_map[dj_report->report_type] == 0)) {
+		dbg_hid("invalid report type:%x\n", dj_report->report_type);
+		return;
+	}
+
+	if (hid_input_report(dj_device->hdev,
+			HID_INPUT_REPORT, &dj_report->report_type,
+			hid_reportid_size_map[dj_report->report_type], 1)) {
+		dbg_hid("hid_input_report error\n");
+	}
+}
+
+static void logi_dj_recv_forward_report(struct dj_device *dj_dev, u8 *data,
+					int size)
+{
+	/* We are called from atomic context (tasklet && djrcv->lock held) */
+	if (hid_input_report(dj_dev->hdev, HID_INPUT_REPORT, data, size, 1))
+		dbg_hid("hid_input_report error\n");
+}
+
+static void logi_dj_recv_forward_input_report(struct hid_device *hdev,
+					      u8 *data, int size)
+{
+	struct dj_receiver_dev *djrcv_dev = hid_get_drvdata(hdev);
+	struct dj_device *dj_dev;
+	unsigned long flags;
+	u8 report = data[0];
+	int i;
+
+	if (report > REPORT_TYPE_RFREPORT_LAST) {
+		hid_err(hdev, "Unexpected input report number %d\n", report);
+		return;
+	}
+
+	spin_lock_irqsave(&djrcv_dev->lock, flags);
+	for (i = 0; i < (DJ_MAX_PAIRED_DEVICES + DJ_DEVICE_INDEX_MIN); i++) {
+		dj_dev = djrcv_dev->paired_dj_devices[i];
+		if (dj_dev && (dj_dev->reports_supported & BIT(report))) {
+			logi_dj_recv_forward_report(dj_dev, data, size);
+			spin_unlock_irqrestore(&djrcv_dev->lock, flags);
+			return;
+		}
+	}
+
+	logi_dj_recv_queue_unknown_work(djrcv_dev);
+	spin_unlock_irqrestore(&djrcv_dev->lock, flags);
+
+	dbg_hid("No dj-devs handling input report number %d\n", report);
+}
+
+static int logi_dj_recv_send_report(struct dj_receiver_dev *djrcv_dev,
+				    struct dj_report *dj_report)
+{
+	struct hid_device *hdev = djrcv_dev->hidpp;
+	struct hid_report *report;
+	struct hid_report_enum *output_report_enum;
+	u8 *data = (u8 *)(&dj_report->device_index);
+	unsigned int i;
+
+	output_report_enum = &hdev->report_enum[HID_OUTPUT_REPORT];
+	report = output_report_enum->report_id_hash[REPORT_ID_DJ_SHORT];
+
+	if (!report) {
+		hid_err(hdev, "%s: unable to find dj report\n", __func__);
+		return -ENODEV;
+	}
+
+	for (i = 0; i < DJREPORT_SHORT_LENGTH - 1; i++)
+		report->field[0]->value[i] = data[i];
+
+	hid_hw_request(hdev, report, HID_REQ_SET_REPORT);
+
+	return 0;
+}
+
+static int logi_dj_recv_query_hidpp_devices(struct dj_receiver_dev *djrcv_dev)
+{
+	static const u8 template[] = {
+		REPORT_ID_HIDPP_SHORT,
+		HIDPP_RECEIVER_INDEX,
+		HIDPP_SET_REGISTER,
+		HIDPP_REG_CONNECTION_STATE,
+		HIDPP_FAKE_DEVICE_ARRIVAL,
+		0x00, 0x00
+	};
+	u8 *hidpp_report;
+	int retval;
+
+	hidpp_report = kmemdup(template, sizeof(template), GFP_KERNEL);
+	if (!hidpp_report)
+		return -ENOMEM;
+
+	retval = hid_hw_raw_request(djrcv_dev->hidpp,
+				    REPORT_ID_HIDPP_SHORT,
+				    hidpp_report, sizeof(template),
+				    HID_OUTPUT_REPORT,
+				    HID_REQ_SET_REPORT);
+
+	kfree(hidpp_report);
+	return (retval < 0) ? retval : 0;
+}
+
+static int logi_dj_recv_query_paired_devices(struct dj_receiver_dev *djrcv_dev)
+{
+	struct dj_report *dj_report;
+	int retval;
+
+	djrcv_dev->last_query = jiffies;
+
+	if (djrcv_dev->type != recvr_type_dj)
+		return logi_dj_recv_query_hidpp_devices(djrcv_dev);
+
+	dj_report = kzalloc(sizeof(struct dj_report), GFP_KERNEL);
+	if (!dj_report)
+		return -ENOMEM;
+	dj_report->report_id = REPORT_ID_DJ_SHORT;
+	dj_report->device_index = HIDPP_RECEIVER_INDEX;
+	dj_report->report_type = REPORT_TYPE_CMD_GET_PAIRED_DEVICES;
+	retval = logi_dj_recv_send_report(djrcv_dev, dj_report);
+	kfree(dj_report);
+	return retval;
+}
+
+
+static int logi_dj_recv_switch_to_dj_mode(struct dj_receiver_dev *djrcv_dev,
+					  unsigned timeout)
+{
+	struct hid_device *hdev = djrcv_dev->hidpp;
+	struct dj_report *dj_report;
+	u8 *buf;
+	int retval = 0;
+
+	dj_report = kzalloc(sizeof(struct dj_report), GFP_KERNEL);
+	if (!dj_report)
+		return -ENOMEM;
+
+	if (djrcv_dev->type == recvr_type_dj) {
+		dj_report->report_id = REPORT_ID_DJ_SHORT;
+		dj_report->device_index = HIDPP_RECEIVER_INDEX;
+		dj_report->report_type = REPORT_TYPE_CMD_SWITCH;
+		dj_report->report_params[CMD_SWITCH_PARAM_DEVBITFIELD] = 0x3F;
+		dj_report->report_params[CMD_SWITCH_PARAM_TIMEOUT_SECONDS] =
+								(u8)timeout;
+
+		retval = logi_dj_recv_send_report(djrcv_dev, dj_report);
+
+		/*
+		 * Ugly sleep to work around a USB 3.0 bug when the receiver is
+		 * still processing the "switch-to-dj" command while we send an
+		 * other command.
+		 * 50 msec should gives enough time to the receiver to be ready.
+		 */
+		msleep(50);
+
+		if (retval)
+			return retval;
+	}
+
+	/*
+	 * Magical bits to set up hidpp notifications when the dj devices
+	 * are connected/disconnected.
+	 *
+	 * We can reuse dj_report because HIDPP_REPORT_SHORT_LENGTH is smaller
+	 * than DJREPORT_SHORT_LENGTH.
+	 */
+	buf = (u8 *)dj_report;
+
+	memset(buf, 0, HIDPP_REPORT_SHORT_LENGTH);
+
+	buf[0] = REPORT_ID_HIDPP_SHORT;
+	buf[1] = HIDPP_RECEIVER_INDEX;
+	buf[2] = 0x80;
+	buf[3] = 0x00;
+	buf[4] = 0x00;
+	buf[5] = 0x09;
+	buf[6] = 0x00;
+
+	retval = hid_hw_raw_request(hdev, REPORT_ID_HIDPP_SHORT, buf,
+			HIDPP_REPORT_SHORT_LENGTH, HID_OUTPUT_REPORT,
+			HID_REQ_SET_REPORT);
+
+	kfree(dj_report);
+	return retval;
+}
+
+
+static int logi_dj_ll_open(struct hid_device *hid)
+{
+	dbg_hid("%s: %s\n", __func__, hid->phys);
+	return 0;
+
+}
+
+static void logi_dj_ll_close(struct hid_device *hid)
+{
+	dbg_hid("%s: %s\n", __func__, hid->phys);
+}
+
+/*
+ * Register 0xB5 is "pairing information". It is solely intended for the
+ * receiver, so do not overwrite the device index.
+ */
+static u8 unifying_pairing_query[]  = { REPORT_ID_HIDPP_SHORT,
+					HIDPP_RECEIVER_INDEX,
+					HIDPP_GET_LONG_REGISTER,
+					HIDPP_REG_PAIRING_INFORMATION };
+static u8 unifying_pairing_answer[] = { REPORT_ID_HIDPP_LONG,
+					HIDPP_RECEIVER_INDEX,
+					HIDPP_GET_LONG_REGISTER,
+					HIDPP_REG_PAIRING_INFORMATION };
+
+static int logi_dj_ll_raw_request(struct hid_device *hid,
+				  unsigned char reportnum, __u8 *buf,
+				  size_t count, unsigned char report_type,
+				  int reqtype)
+{
+	struct dj_device *djdev = hid->driver_data;
+	struct dj_receiver_dev *djrcv_dev = djdev->dj_receiver_dev;
+	u8 *out_buf;
+	int ret;
+
+	if ((buf[0] == REPORT_ID_HIDPP_SHORT) ||
+	    (buf[0] == REPORT_ID_HIDPP_LONG) ||
+	    (buf[0] == REPORT_ID_HIDPP_VERY_LONG)) {
+		if (count < 2)
+			return -EINVAL;
+
+		/* special case where we should not overwrite
+		 * the device_index */
+		if (count == 7 && !memcmp(buf, unifying_pairing_query,
+					  sizeof(unifying_pairing_query)))
+			buf[4] = (buf[4] & 0xf0) | (djdev->device_index - 1);
+		else
+			buf[1] = djdev->device_index;
+		return hid_hw_raw_request(djrcv_dev->hidpp, reportnum, buf,
+				count, report_type, reqtype);
+	}
+
+	if (buf[0] != REPORT_TYPE_LEDS)
+		return -EINVAL;
+
+	if (djrcv_dev->type != recvr_type_dj && count >= 2) {
+		if (!djrcv_dev->keyboard) {
+			hid_warn(hid, "Received REPORT_TYPE_LEDS request before the keyboard interface was enumerated\n");
+			return 0;
+		}
+		/* usbhid overrides the report ID and ignores the first byte */
+		return hid_hw_raw_request(djrcv_dev->keyboard, 0, buf, count,
+					  report_type, reqtype);
+	}
+
+	out_buf = kzalloc(DJREPORT_SHORT_LENGTH, GFP_ATOMIC);
+	if (!out_buf)
+		return -ENOMEM;
+
+	if (count > DJREPORT_SHORT_LENGTH - 2)
+		count = DJREPORT_SHORT_LENGTH - 2;
+
+	out_buf[0] = REPORT_ID_DJ_SHORT;
+	out_buf[1] = djdev->device_index;
+	memcpy(out_buf + 2, buf, count);
+
+	ret = hid_hw_raw_request(djrcv_dev->hidpp, out_buf[0], out_buf,
+		DJREPORT_SHORT_LENGTH, report_type, reqtype);
+
+	kfree(out_buf);
+	return ret;
+}
+
+static void rdcat(char *rdesc, unsigned int *rsize, const char *data, unsigned int size)
+{
+	memcpy(rdesc + *rsize, data, size);
+	*rsize += size;
+}
+
+static int logi_dj_ll_parse(struct hid_device *hid)
+{
+	struct dj_device *djdev = hid->driver_data;
+	unsigned int rsize = 0;
+	char *rdesc;
+	int retval;
+
+	dbg_hid("%s\n", __func__);
+
+	djdev->hdev->version = 0x0111;
+	djdev->hdev->country = 0x00;
+
+	rdesc = kmalloc(MAX_RDESC_SIZE, GFP_KERNEL);
+	if (!rdesc)
+		return -ENOMEM;
+
+	if (djdev->reports_supported & STD_KEYBOARD) {
+		dbg_hid("%s: sending a kbd descriptor, reports_supported: %llx\n",
+			__func__, djdev->reports_supported);
+		rdcat(rdesc, &rsize, kbd_descriptor, sizeof(kbd_descriptor));
+	}
+
+	if (djdev->reports_supported & STD_MOUSE) {
+		dbg_hid("%s: sending a mouse descriptor, reports_supported: %llx\n",
+			__func__, djdev->reports_supported);
+		if (djdev->dj_receiver_dev->type == recvr_type_gaming_hidpp ||
+		    djdev->dj_receiver_dev->type == recvr_type_mouse_only)
+			rdcat(rdesc, &rsize, mse_high_res_descriptor,
+			      sizeof(mse_high_res_descriptor));
+		else if (djdev->dj_receiver_dev->type == recvr_type_27mhz)
+			rdcat(rdesc, &rsize, mse_27mhz_descriptor,
+			      sizeof(mse_27mhz_descriptor));
+		else if (recvr_type_is_bluetooth(djdev->dj_receiver_dev->type))
+			rdcat(rdesc, &rsize, mse_bluetooth_descriptor,
+			      sizeof(mse_bluetooth_descriptor));
+		else
+			rdcat(rdesc, &rsize, mse_descriptor,
+			      sizeof(mse_descriptor));
+	}
+
+	if (djdev->reports_supported & KBD_MOUSE) {
+		dbg_hid("%s: sending a kbd-mouse descriptor, reports_supported: %llx\n",
+			__func__, djdev->reports_supported);
+		rdcat(rdesc, &rsize, mse5_bluetooth_descriptor,
+		      sizeof(mse5_bluetooth_descriptor));
+	}
+
+	if (djdev->reports_supported & MULTIMEDIA) {
+		dbg_hid("%s: sending a multimedia report descriptor: %llx\n",
+			__func__, djdev->reports_supported);
+		rdcat(rdesc, &rsize, consumer_descriptor, sizeof(consumer_descriptor));
+	}
+
+	if (djdev->reports_supported & POWER_KEYS) {
+		dbg_hid("%s: sending a power keys report descriptor: %llx\n",
+			__func__, djdev->reports_supported);
+		rdcat(rdesc, &rsize, syscontrol_descriptor, sizeof(syscontrol_descriptor));
+	}
+
+	if (djdev->reports_supported & MEDIA_CENTER) {
+		dbg_hid("%s: sending a media center report descriptor: %llx\n",
+			__func__, djdev->reports_supported);
+		rdcat(rdesc, &rsize, media_descriptor, sizeof(media_descriptor));
+	}
+
+	if (djdev->reports_supported & KBD_LEDS) {
+		dbg_hid("%s: need to send kbd leds report descriptor: %llx\n",
+			__func__, djdev->reports_supported);
+	}
+
+	if (djdev->reports_supported & HIDPP) {
+		dbg_hid("%s: sending a HID++ descriptor, reports_supported: %llx\n",
+			__func__, djdev->reports_supported);
+		rdcat(rdesc, &rsize, hidpp_descriptor,
+		      sizeof(hidpp_descriptor));
+	}
+
+	retval = hid_parse_report(hid, rdesc, rsize);
+	kfree(rdesc);
+
+	return retval;
+}
+
+static int logi_dj_ll_start(struct hid_device *hid)
+{
+	dbg_hid("%s\n", __func__);
+	return 0;
+}
+
+static void logi_dj_ll_stop(struct hid_device *hid)
+{
+	dbg_hid("%s\n", __func__);
+}
+
+static bool logi_dj_ll_may_wakeup(struct hid_device *hid)
+{
+	struct dj_device *djdev = hid->driver_data;
+	struct dj_receiver_dev *djrcv_dev = djdev->dj_receiver_dev;
+
+	return hid_hw_may_wakeup(djrcv_dev->hidpp);
+}
+
+static struct hid_ll_driver logi_dj_ll_driver = {
+	.parse = logi_dj_ll_parse,
+	.start = logi_dj_ll_start,
+	.stop = logi_dj_ll_stop,
+	.open = logi_dj_ll_open,
+	.close = logi_dj_ll_close,
+	.raw_request = logi_dj_ll_raw_request,
+	.may_wakeup = logi_dj_ll_may_wakeup,
+};
+
+static int logi_dj_dj_event(struct hid_device *hdev,
+			     struct hid_report *report, u8 *data,
+			     int size)
+{
+	struct dj_receiver_dev *djrcv_dev = hid_get_drvdata(hdev);
+	struct dj_report *dj_report = (struct dj_report *) data;
+	unsigned long flags;
+
+	/*
+	 * Here we receive all data coming from iface 2, there are 3 cases:
+	 *
+	 * 1) Data is intended for this driver i. e. data contains arrival,
+	 * departure, etc notifications, in which case we queue them for delayed
+	 * processing by the work queue. We return 1 to hid-core as no further
+	 * processing is required from it.
+	 *
+	 * 2) Data informs a connection change, if the change means rf link
+	 * loss, then we must send a null report to the upper layer to discard
+	 * potentially pressed keys that may be repeated forever by the input
+	 * layer. Return 1 to hid-core as no further processing is required.
+	 *
+	 * 3) Data is an actual input event from a paired DJ device in which
+	 * case we forward it to the correct hid device (via hid_input_report()
+	 * ) and return 1 so hid-core does not anything else with it.
+	 */
+
+	if ((dj_report->device_index < DJ_DEVICE_INDEX_MIN) ||
+	    (dj_report->device_index > DJ_DEVICE_INDEX_MAX)) {
+		/*
+		 * Device index is wrong, bail out.
+		 * This driver can ignore safely the receiver notifications,
+		 * so ignore those reports too.
+		 */
+		if (dj_report->device_index != DJ_RECEIVER_INDEX)
+			hid_err(hdev, "%s: invalid device index:%d\n",
+				__func__, dj_report->device_index);
+		return false;
+	}
+
+	spin_lock_irqsave(&djrcv_dev->lock, flags);
+
+	if (!djrcv_dev->paired_dj_devices[dj_report->device_index]) {
+		/* received an event for an unknown device, bail out */
+		logi_dj_recv_queue_notification(djrcv_dev, dj_report);
+		goto out;
+	}
+
+	switch (dj_report->report_type) {
+	case REPORT_TYPE_NOTIF_DEVICE_PAIRED:
+		/* pairing notifications are handled above the switch */
+		break;
+	case REPORT_TYPE_NOTIF_DEVICE_UNPAIRED:
+		logi_dj_recv_queue_notification(djrcv_dev, dj_report);
+		break;
+	case REPORT_TYPE_NOTIF_CONNECTION_STATUS:
+		if (dj_report->report_params[CONNECTION_STATUS_PARAM_STATUS] ==
+		    STATUS_LINKLOSS) {
+			logi_dj_recv_forward_null_report(djrcv_dev, dj_report);
+		}
+		break;
+	default:
+		logi_dj_recv_forward_dj(djrcv_dev, dj_report);
+	}
+
+out:
+	spin_unlock_irqrestore(&djrcv_dev->lock, flags);
+
+	return true;
+}
+
+static int logi_dj_hidpp_event(struct hid_device *hdev,
+			     struct hid_report *report, u8 *data,
+			     int size)
+{
+	struct dj_receiver_dev *djrcv_dev = hid_get_drvdata(hdev);
+	struct hidpp_event *hidpp_report = (struct hidpp_event *) data;
+	struct dj_device *dj_dev;
+	unsigned long flags;
+	u8 device_index = hidpp_report->device_index;
+
+	if (device_index == HIDPP_RECEIVER_INDEX) {
+		/* special case were the device wants to know its unifying
+		 * name */
+		if (size == HIDPP_REPORT_LONG_LENGTH &&
+		    !memcmp(data, unifying_pairing_answer,
+			    sizeof(unifying_pairing_answer)))
+			device_index = (data[4] & 0x0F) + 1;
+		else
+			return false;
+	}
+
+	/*
+	 * Data is from the HID++ collection, in this case, we forward the
+	 * data to the corresponding child dj device and return 0 to hid-core
+	 * so he data also goes to the hidraw device of the receiver. This
+	 * allows a user space application to implement the full HID++ routing
+	 * via the receiver.
+	 */
+
+	if ((device_index < DJ_DEVICE_INDEX_MIN) ||
+	    (device_index > DJ_DEVICE_INDEX_MAX)) {
+		/*
+		 * Device index is wrong, bail out.
+		 * This driver can ignore safely the receiver notifications,
+		 * so ignore those reports too.
+		 */
+		hid_err(hdev, "%s: invalid device index:%d\n", __func__,
+			hidpp_report->device_index);
+		return false;
+	}
+
+	spin_lock_irqsave(&djrcv_dev->lock, flags);
+
+	dj_dev = djrcv_dev->paired_dj_devices[device_index];
+
+	/*
+	 * With 27 MHz receivers, we do not get an explicit unpair event,
+	 * remove the old device if the user has paired a *different* device.
+	 */
+	if (djrcv_dev->type == recvr_type_27mhz && dj_dev &&
+	    hidpp_report->sub_id == REPORT_TYPE_NOTIF_DEVICE_CONNECTED &&
+	    hidpp_report->params[HIDPP_PARAM_PROTO_TYPE] == 0x02 &&
+	    hidpp_report->params[HIDPP_PARAM_27MHZ_DEVID] !=
+						dj_dev->hdev->product) {
+		struct dj_workitem workitem = {
+			.device_index = hidpp_report->device_index,
+			.type = WORKITEM_TYPE_UNPAIRED,
+		};
+		kfifo_in(&djrcv_dev->notif_fifo, &workitem, sizeof(workitem));
+		/* logi_hidpp_recv_queue_notif will queue the work */
+		dj_dev = NULL;
+	}
+
+	if (dj_dev) {
+		logi_dj_recv_forward_report(dj_dev, data, size);
+	} else {
+		if (hidpp_report->sub_id == REPORT_TYPE_NOTIF_DEVICE_CONNECTED)
+			logi_hidpp_recv_queue_notif(hdev, hidpp_report);
+		else
+			logi_dj_recv_queue_unknown_work(djrcv_dev);
+	}
+
+	spin_unlock_irqrestore(&djrcv_dev->lock, flags);
+
+	return false;
+}
+
+static int logi_dj_raw_event(struct hid_device *hdev,
+			     struct hid_report *report, u8 *data,
+			     int size)
+{
+	struct dj_receiver_dev *djrcv_dev = hid_get_drvdata(hdev);
+	dbg_hid("%s, size:%d\n", __func__, size);
+
+	if (!djrcv_dev)
+		return 0;
+
+	if (!hdev->report_enum[HID_INPUT_REPORT].numbered) {
+
+		if (djrcv_dev->unnumbered_application == HID_GD_KEYBOARD) {
+			/*
+			 * For the keyboard, we can reuse the same report by
+			 * using the second byte which is constant in the USB
+			 * HID report descriptor.
+			 */
+			data[1] = data[0];
+			data[0] = REPORT_TYPE_KEYBOARD;
+
+			logi_dj_recv_forward_input_report(hdev, data, size);
+
+			/* restore previous state */
+			data[0] = data[1];
+			data[1] = 0;
+		}
+		/*
+		 * Mouse-only receivers send unnumbered mouse data. The 27 MHz
+		 * receiver uses 6 byte packets, the nano receiver 8 bytes.
+		 */
+		if (djrcv_dev->unnumbered_application == HID_GD_MOUSE &&
+		    size <= 8) {
+			u8 mouse_report[9];
+
+			/* Prepend report id */
+			mouse_report[0] = REPORT_TYPE_MOUSE;
+			memcpy(mouse_report + 1, data, size);
+			logi_dj_recv_forward_input_report(hdev, mouse_report,
+							  size + 1);
+		}
+
+		return false;
+	}
+
+	switch (data[0]) {
+	case REPORT_ID_DJ_SHORT:
+		if (size != DJREPORT_SHORT_LENGTH) {
+			hid_err(hdev, "Short DJ report bad size (%d)", size);
+			return false;
+		}
+		return logi_dj_dj_event(hdev, report, data, size);
+	case REPORT_ID_DJ_LONG:
+		if (size != DJREPORT_LONG_LENGTH) {
+			hid_err(hdev, "Long DJ report bad size (%d)", size);
+			return false;
+		}
+		return logi_dj_dj_event(hdev, report, data, size);
+	case REPORT_ID_HIDPP_SHORT:
+		if (size != HIDPP_REPORT_SHORT_LENGTH) {
+			hid_err(hdev, "Short HID++ report bad size (%d)", size);
+			return false;
+		}
+		return logi_dj_hidpp_event(hdev, report, data, size);
+	case REPORT_ID_HIDPP_LONG:
+		if (size != HIDPP_REPORT_LONG_LENGTH) {
+			hid_err(hdev, "Long HID++ report bad size (%d)", size);
+			return false;
+		}
+		return logi_dj_hidpp_event(hdev, report, data, size);
+	}
+
+	logi_dj_recv_forward_input_report(hdev, data, size);
+
+	return false;
+}
+
+static int logi_dj_probe(struct hid_device *hdev,
+			 const struct hid_device_id *id)
+{
+	struct hid_report_enum *rep_enum;
+	struct hid_report *rep;
+	struct dj_receiver_dev *djrcv_dev;
+	struct usb_interface *intf;
+	unsigned int no_dj_interfaces = 0;
+	bool has_hidpp = false;
+	unsigned long flags;
+	int retval;
+
+	/*
+	 * Call to usbhid to fetch the HID descriptors of the current
+	 * interface subsequently call to the hid/hid-core to parse the
+	 * fetched descriptors.
+	 */
+	retval = hid_parse(hdev);
+	if (retval) {
+		hid_err(hdev, "%s: parse failed\n", __func__);
+		return retval;
+	}
+
+	/*
+	 * Some KVMs add an extra interface for e.g. mouse emulation. If we
+	 * treat these as logitech-dj interfaces then this causes input events
+	 * reported through this extra interface to not be reported correctly.
+	 * To avoid this, we treat these as generic-hid devices.
+	 */
+	switch (id->driver_data) {
+	case recvr_type_dj:		no_dj_interfaces = 3; break;
+	case recvr_type_hidpp:		no_dj_interfaces = 2; break;
+	case recvr_type_gaming_hidpp:	no_dj_interfaces = 3; break;
+	case recvr_type_mouse_only:	no_dj_interfaces = 2; break;
+	case recvr_type_27mhz:		no_dj_interfaces = 2; break;
+	case recvr_type_bluetooth:	no_dj_interfaces = 2; break;
+	case recvr_type_dinovo:		no_dj_interfaces = 2; break;
+	}
+	if (hid_is_usb(hdev)) {
+		intf = to_usb_interface(hdev->dev.parent);
+		if (intf && intf->altsetting->desc.bInterfaceNumber >=
+							no_dj_interfaces) {
+			hdev->quirks |= HID_QUIRK_INPUT_PER_APP;
+			return hid_hw_start(hdev, HID_CONNECT_DEFAULT);
+		}
+	}
+
+	rep_enum = &hdev->report_enum[HID_INPUT_REPORT];
+
+	/* no input reports, bail out */
+	if (list_empty(&rep_enum->report_list))
+		return -ENODEV;
+
+	/*
+	 * Check for the HID++ application.
+	 * Note: we should theoretically check for HID++ and DJ
+	 * collections, but this will do.
+	 */
+	list_for_each_entry(rep, &rep_enum->report_list, list) {
+		if (rep->application == 0xff000001)
+			has_hidpp = true;
+	}
+
+	/*
+	 * Ignore interfaces without DJ/HID++ collection, they will not carry
+	 * any data, dont create any hid_device for them.
+	 */
+	if (!has_hidpp && id->driver_data == recvr_type_dj)
+		return -ENODEV;
+
+	/* get the current application attached to the node */
+	rep = list_first_entry(&rep_enum->report_list, struct hid_report, list);
+	djrcv_dev = dj_get_receiver_dev(hdev, id->driver_data,
+					rep->application, has_hidpp);
+	if (!djrcv_dev) {
+		hid_err(hdev, "%s: dj_get_receiver_dev failed\n", __func__);
+		return -ENOMEM;
+	}
+
+	if (!rep_enum->numbered)
+		djrcv_dev->unnumbered_application = rep->application;
+
+	/* Starts the usb device and connects to upper interfaces hiddev and
+	 * hidraw */
+	retval = hid_hw_start(hdev, HID_CONNECT_HIDRAW|HID_CONNECT_HIDDEV);
+	if (retval) {
+		hid_err(hdev, "%s: hid_hw_start returned error\n", __func__);
+		goto hid_hw_start_fail;
+	}
+
+	if (has_hidpp) {
+		retval = logi_dj_recv_switch_to_dj_mode(djrcv_dev, 0);
+		if (retval < 0) {
+			hid_err(hdev, "%s: logi_dj_recv_switch_to_dj_mode returned error:%d\n",
+				__func__, retval);
+			goto switch_to_dj_mode_fail;
+		}
+	}
+
+	/* This is enabling the polling urb on the IN endpoint */
+	retval = hid_hw_open(hdev);
+	if (retval < 0) {
+		hid_err(hdev, "%s: hid_hw_open returned error:%d\n",
+			__func__, retval);
+		goto llopen_failed;
+	}
+
+	/* Allow incoming packets to arrive: */
+	hid_device_io_start(hdev);
+
+	if (has_hidpp) {
+		spin_lock_irqsave(&djrcv_dev->lock, flags);
+		djrcv_dev->ready = true;
+		spin_unlock_irqrestore(&djrcv_dev->lock, flags);
+		retval = logi_dj_recv_query_paired_devices(djrcv_dev);
+		if (retval < 0) {
+			hid_err(hdev, "%s: logi_dj_recv_query_paired_devices error:%d\n",
+				__func__, retval);
+			/*
+			 * This can happen with a KVM, let the probe succeed,
+			 * logi_dj_recv_queue_unknown_work will retry later.
+			 */
+		}
+	}
+
+	return 0;
+
+llopen_failed:
+switch_to_dj_mode_fail:
+	hid_hw_stop(hdev);
+
+hid_hw_start_fail:
+	dj_put_receiver_dev(hdev);
+	return retval;
+}
+
+#ifdef CONFIG_PM
+static int logi_dj_reset_resume(struct hid_device *hdev)
+{
+	int retval;
+	struct dj_receiver_dev *djrcv_dev = hid_get_drvdata(hdev);
+
+	if (!djrcv_dev || djrcv_dev->hidpp != hdev)
+		return 0;
+
+	retval = logi_dj_recv_switch_to_dj_mode(djrcv_dev, 0);
+	if (retval < 0) {
+		hid_err(hdev, "%s: logi_dj_recv_switch_to_dj_mode returned error:%d\n",
+			__func__, retval);
+	}
+
+	return 0;
+}
+#endif
+
+static void logi_dj_remove(struct hid_device *hdev)
+{
+	struct dj_receiver_dev *djrcv_dev = hid_get_drvdata(hdev);
+	struct dj_device *dj_dev;
+	unsigned long flags;
+	int i;
+
+	dbg_hid("%s\n", __func__);
+
+	if (!djrcv_dev)
+		return hid_hw_stop(hdev);
+
+	/*
+	 * This ensures that if the work gets requeued from another
+	 * interface of the same receiver it will be a no-op.
+	 */
+	spin_lock_irqsave(&djrcv_dev->lock, flags);
+	djrcv_dev->ready = false;
+	spin_unlock_irqrestore(&djrcv_dev->lock, flags);
+
+	cancel_work_sync(&djrcv_dev->work);
+
+	hid_hw_close(hdev);
+	hid_hw_stop(hdev);
+
+	/*
+	 * For proper operation we need access to all interfaces, so we destroy
+	 * the paired devices when we're unbound from any interface.
+	 *
+	 * Note we may still be bound to other interfaces, sharing the same
+	 * djrcv_dev, so we need locking here.
+	 */
+	for (i = 0; i < (DJ_MAX_PAIRED_DEVICES + DJ_DEVICE_INDEX_MIN); i++) {
+		spin_lock_irqsave(&djrcv_dev->lock, flags);
+		dj_dev = djrcv_dev->paired_dj_devices[i];
+		djrcv_dev->paired_dj_devices[i] = NULL;
+		spin_unlock_irqrestore(&djrcv_dev->lock, flags);
+		if (dj_dev != NULL) {
+			hid_destroy_device(dj_dev->hdev);
+			kfree(dj_dev);
+		}
+	}
+
+	dj_put_receiver_dev(hdev);
+}
+
+static const struct hid_device_id logi_dj_receivers[] = {
+	{ /* Logitech unifying receiver (0xc52b) */
+	  HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH,
+		USB_DEVICE_ID_LOGITECH_UNIFYING_RECEIVER),
+	 .driver_data = recvr_type_dj},
+	{ /* Logitech unifying receiver (0xc532) */
+	  HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH,
+		USB_DEVICE_ID_LOGITECH_UNIFYING_RECEIVER_2),
+	 .driver_data = recvr_type_dj},
+
+	{ /* Logitech Nano mouse only receiver (0xc52f) */
+	  HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH,
+			 USB_DEVICE_ID_LOGITECH_NANO_RECEIVER),
+	 .driver_data = recvr_type_mouse_only},
+	{ /* Logitech Nano (non DJ) receiver (0xc534) */
+	  HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH,
+			 USB_DEVICE_ID_LOGITECH_NANO_RECEIVER_2),
+	 .driver_data = recvr_type_hidpp},
+
+	{ /* Logitech G700(s) receiver (0xc531) */
+	  HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH,
+			 USB_DEVICE_ID_LOGITECH_G700_RECEIVER),
+	 .driver_data = recvr_type_gaming_hidpp},
+	{ /* Logitech G602 receiver (0xc537) */
+	  HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH,
+		0xc537),
+	 .driver_data = recvr_type_gaming_hidpp},
+	{ /* Logitech lightspeed receiver (0xc539) */
+	  HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH,
+		USB_DEVICE_ID_LOGITECH_NANO_RECEIVER_LIGHTSPEED_1),
+	 .driver_data = recvr_type_gaming_hidpp},
+	{ /* Logitech powerplay receiver (0xc53a) */
+	  HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH,
+		USB_DEVICE_ID_LOGITECH_NANO_RECEIVER_POWERPLAY),
+	 .driver_data = recvr_type_gaming_hidpp},
+	{ /* Logitech lightspeed receiver (0xc53f) */
+	  HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH,
+		USB_DEVICE_ID_LOGITECH_NANO_RECEIVER_LIGHTSPEED_1_1),
+	 .driver_data = recvr_type_gaming_hidpp},
+
+	{ /* Logitech 27 MHz HID++ 1.0 receiver (0xc513) */
+	  HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_MX3000_RECEIVER),
+	 .driver_data = recvr_type_27mhz},
+	{ /* Logitech 27 MHz HID++ 1.0 receiver (0xc517) */
+	  HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH,
+		USB_DEVICE_ID_S510_RECEIVER_2),
+	 .driver_data = recvr_type_27mhz},
+	{ /* Logitech 27 MHz HID++ 1.0 mouse-only receiver (0xc51b) */
+	  HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH,
+		USB_DEVICE_ID_LOGITECH_27MHZ_MOUSE_RECEIVER),
+	 .driver_data = recvr_type_27mhz},
+
+	{ /* Logitech MX5000 HID++ / bluetooth receiver keyboard intf. (0xc70e) */
+	  HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH,
+		USB_DEVICE_ID_MX5000_RECEIVER_KBD_DEV),
+	 .driver_data = recvr_type_bluetooth},
+	{ /* Logitech MX5000 HID++ / bluetooth receiver mouse intf. (0xc70a) */
+	  HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH,
+		USB_DEVICE_ID_MX5000_RECEIVER_MOUSE_DEV),
+	 .driver_data = recvr_type_bluetooth},
+	{ /* Logitech MX5500 HID++ / bluetooth receiver keyboard intf. (0xc71b) */
+	  HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH,
+		USB_DEVICE_ID_MX5500_RECEIVER_KBD_DEV),
+	 .driver_data = recvr_type_bluetooth},
+	{ /* Logitech MX5500 HID++ / bluetooth receiver mouse intf. (0xc71c) */
+	  HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH,
+		USB_DEVICE_ID_MX5500_RECEIVER_MOUSE_DEV),
+	 .driver_data = recvr_type_bluetooth},
+
+	{ /* Logitech Dinovo Edge HID++ / bluetooth receiver keyboard intf. (0xc713) */
+	  HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH,
+		USB_DEVICE_ID_DINOVO_EDGE_RECEIVER_KBD_DEV),
+	 .driver_data = recvr_type_dinovo},
+	{ /* Logitech Dinovo Edge HID++ / bluetooth receiver mouse intf. (0xc714) */
+	  HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH,
+		USB_DEVICE_ID_DINOVO_EDGE_RECEIVER_MOUSE_DEV),
+	 .driver_data = recvr_type_dinovo},
+	{ /* Logitech DiNovo Mini HID++ / bluetooth receiver mouse intf. (0xc71e) */
+	  HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH,
+		USB_DEVICE_ID_DINOVO_MINI_RECEIVER_KBD_DEV),
+	 .driver_data = recvr_type_dinovo},
+	{ /* Logitech DiNovo Mini HID++ / bluetooth receiver keyboard intf. (0xc71f) */
+	  HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH,
+		USB_DEVICE_ID_DINOVO_MINI_RECEIVER_MOUSE_DEV),
+	 .driver_data = recvr_type_dinovo},
+	{}
+};
+
+MODULE_DEVICE_TABLE(hid, logi_dj_receivers);
+
+static struct hid_driver logi_djreceiver_driver = {
+	.name = "logitech-djreceiver",
+	.id_table = logi_dj_receivers,
+	.probe = logi_dj_probe,
+	.remove = logi_dj_remove,
+	.raw_event = logi_dj_raw_event,
+#ifdef CONFIG_PM
+	.reset_resume = logi_dj_reset_resume,
+#endif
+};
+
+module_hid_driver(logi_djreceiver_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Logitech");
+MODULE_AUTHOR("Nestor Lopez Casado");
+MODULE_AUTHOR("nlopezcasad@logitech.com");