V4L/DVB: ir-core: add imon driver
authorJarod Wilson <jarod@redhat.com>
Fri, 16 Apr 2010 21:29:02 +0000 (18:29 -0300)
committerMauro Carvalho Chehab <mchehab@redhat.com>
Wed, 19 May 2010 15:57:42 +0000 (12:57 -0300)
This is a new driver for the SoundGraph iMON and Antec Veris IR/display
devices commonly found in many home theater pc cases and as after-market
case additions.

[mchehab@redhat.com: add KERN_CONT on line 2098 to shutup checkpatc.pl]

Signed-off-by: Jarod Wilson <jarod@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
drivers/media/IR/Kconfig
drivers/media/IR/Makefile
drivers/media/IR/imon.c [new file with mode: 0644]

index ee66d16d9ff2d18ef9aa5f2a46508f28569da0e9..dae5ea113867dbf8a70fed42adc426306a9d984e 100644 (file)
@@ -36,3 +36,15 @@ config IR_RC6_DECODER
        ---help---
           Enable this option if you have an infrared remote control which
           uses the RC6 protocol, and you need software decoding support.
+
+config IR_IMON
+       tristate "SoundGraph iMON Receiver and Display"
+       depends on USB_ARCH_HAS_HCD
+       depends on IR_CORE
+       select USB
+       ---help---
+          Say Y here if you want to use a SoundGraph iMON (aka Antec Veris)
+          IR Receiver and/or LCD/VFD/VGA display.
+
+          To compile this driver as a module, choose M here: the
+          module will be called imon.
index 792d9cad7efc12eda3ec1b4bb16bf888725417bc..57b145515d4fcc52882f9923b6737a204c8c6504 100644 (file)
@@ -8,3 +8,6 @@ obj-$(CONFIG_VIDEO_IR) += ir-common.o
 obj-$(CONFIG_IR_NEC_DECODER) += ir-nec-decoder.o
 obj-$(CONFIG_IR_RC5_DECODER) += ir-rc5-decoder.o
 obj-$(CONFIG_IR_RC6_DECODER) += ir-rc6-decoder.o
+
+# stand-alone IR receivers/transmitters
+obj-$(CONFIG_IR_IMON) += imon.o
diff --git a/drivers/media/IR/imon.c b/drivers/media/IR/imon.c
new file mode 100644 (file)
index 0000000..170fb9f
--- /dev/null
@@ -0,0 +1,2417 @@
+/*
+ *   imon.c:   input and display driver for SoundGraph iMON IR/VFD/LCD
+ *
+ *   Copyright(C) 2009  Jarod Wilson <jarod@wilsonet.com>
+ *   Portions based on the original lirc_imon driver,
+ *     Copyright(C) 2004  Venky Raju(dev@venky.ws)
+ *
+ *   Huge thanks to R. Geoff Newbury for invaluable debugging on the
+ *   0xffdc iMON devices, and for sending me one to hack on, without
+ *   which the support for them wouldn't be nearly as good. Thanks
+ *   also to the numerous 0xffdc device owners that tested auto-config
+ *   support for me and provided debug dumps from their devices.
+ *
+ *   imon is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+
+#include <linux/input.h>
+#include <linux/usb.h>
+#include <linux/usb/input.h>
+#include <media/ir-core.h>
+
+#include <linux/time.h>
+#include <linux/timer.h>
+
+#define MOD_AUTHOR     "Jarod Wilson <jarod@wilsonet.com>"
+#define MOD_DESC       "Driver for SoundGraph iMON MultiMedia IR/Display"
+#define MOD_NAME       "imon"
+#define MOD_VERSION    "0.9.1"
+
+#define DISPLAY_MINOR_BASE     144
+#define DEVICE_NAME    "lcd%d"
+
+#define BUF_CHUNK_SIZE 8
+#define BUF_SIZE       128
+
+#define BIT_DURATION   250     /* each bit received is 250us */
+
+#define IMON_CLOCK_ENABLE_PACKETS      2
+#define IMON_KEY_RELEASE_OFFSET                1000
+
+/*** P R O T O T Y P E S ***/
+
+/* USB Callback prototypes */
+static int imon_probe(struct usb_interface *interface,
+                     const struct usb_device_id *id);
+static void imon_disconnect(struct usb_interface *interface);
+static void usb_rx_callback_intf0(struct urb *urb);
+static void usb_rx_callback_intf1(struct urb *urb);
+static void usb_tx_callback(struct urb *urb);
+
+/* suspend/resume support */
+static int imon_resume(struct usb_interface *intf);
+static int imon_suspend(struct usb_interface *intf, pm_message_t message);
+
+/* Display file_operations function prototypes */
+static int display_open(struct inode *inode, struct file *file);
+static int display_close(struct inode *inode, struct file *file);
+
+/* VFD write operation */
+static ssize_t vfd_write(struct file *file, const char *buf,
+                        size_t n_bytes, loff_t *pos);
+
+/* LCD file_operations override function prototypes */
+static ssize_t lcd_write(struct file *file, const char *buf,
+                        size_t n_bytes, loff_t *pos);
+
+/*** G L O B A L S ***/
+
+struct imon_context {
+       struct device *dev;
+       struct ir_dev_props *props;
+       struct ir_input_dev *ir;
+       /* Newer devices have two interfaces */
+       struct usb_device *usbdev_intf0;
+       struct usb_device *usbdev_intf1;
+
+       bool display_supported;         /* not all controllers do */
+       bool display_isopen;            /* display port has been opened */
+       bool rf_isassociating;          /* RF remote associating */
+       bool dev_present_intf0;         /* USB device presence, interface 0 */
+       bool dev_present_intf1;         /* USB device presence, interface 1 */
+
+       struct mutex lock;              /* to lock this object */
+       wait_queue_head_t remove_ok;    /* For unexpected USB disconnects */
+
+       struct usb_endpoint_descriptor *rx_endpoint_intf0;
+       struct usb_endpoint_descriptor *rx_endpoint_intf1;
+       struct usb_endpoint_descriptor *tx_endpoint;
+       struct urb *rx_urb_intf0;
+       struct urb *rx_urb_intf1;
+       struct urb *tx_urb;
+       bool tx_control;
+       unsigned char usb_rx_buf[8];
+       unsigned char usb_tx_buf[8];
+
+       struct tx_t {
+               unsigned char data_buf[35];     /* user data buffer */
+               struct completion finished;     /* wait for write to finish */
+               bool busy;                      /* write in progress */
+               int status;                     /* status of tx completion */
+       } tx;
+
+       u16 vendor;                     /* usb vendor ID */
+       u16 product;                    /* usb product ID */
+
+       struct input_dev *idev;         /* input device for remote */
+       struct input_dev *touch;        /* input device for touchscreen */
+
+       u32 kc;                         /* current input keycode */
+       u32 last_keycode;               /* last reported input keycode */
+       u8 ir_protocol;                 /* iMON or MCE (RC6) IR protocol? */
+       u8 ir_proto_mask;               /* supported IR protocol mask */
+       u8 mce_toggle_bit;              /* last mce toggle bit */
+       bool release_code;              /* some keys send a release code */
+
+       u8 display_type;                /* store the display type */
+       bool pad_mouse;                 /* toggle kbd(0)/mouse(1) mode */
+
+       char name_idev[128];            /* input device name */
+       char phys_idev[64];             /* input device phys path */
+       struct timer_list itimer;       /* input device timer, need for rc6 */
+
+       char name_touch[128];           /* touch screen name */
+       char phys_touch[64];            /* touch screen phys path */
+       struct timer_list ttimer;       /* touch screen timer */
+       int touch_x;                    /* x coordinate on touchscreen */
+       int touch_y;                    /* y coordinate on touchscreen */
+};
+
+#define TOUCH_TIMEOUT  (HZ/30)
+#define MCE_TIMEOUT_MS 200
+
+/* vfd character device file operations */
+static const struct file_operations vfd_fops = {
+       .owner          = THIS_MODULE,
+       .open           = &display_open,
+       .write          = &vfd_write,
+       .release        = &display_close
+};
+
+/* lcd character device file operations */
+static const struct file_operations lcd_fops = {
+       .owner          = THIS_MODULE,
+       .open           = &display_open,
+       .write          = &lcd_write,
+       .release        = &display_close
+};
+
+enum {
+       IMON_DISPLAY_TYPE_AUTO = 0,
+       IMON_DISPLAY_TYPE_VFD  = 1,
+       IMON_DISPLAY_TYPE_LCD  = 2,
+       IMON_DISPLAY_TYPE_VGA  = 3,
+       IMON_DISPLAY_TYPE_NONE = 4,
+};
+
+enum {
+       IMON_IR_PROTOCOL_AUTO       = 0x0,
+       IMON_IR_PROTOCOL_MCE        = 0x1,
+       IMON_IR_PROTOCOL_IMON       = 0x2,
+       IMON_IR_PROTOCOL_IMON_NOPAD = 0x4,
+};
+
+enum {
+       IMON_IR_PROTO_MASK_NONE = 0x0,
+       IMON_IR_PROTO_MASK_MCE  = IMON_IR_PROTOCOL_MCE,
+       IMON_IR_PROTO_MASK_IMON = IMON_IR_PROTOCOL_IMON |
+                                 IMON_IR_PROTOCOL_IMON_NOPAD,
+};
+
+enum {
+       IMON_KEY_IMON   = 0,
+       IMON_KEY_MCE    = 1,
+       IMON_KEY_PANEL  = 2,
+};
+
+/*
+ * USB Device ID for iMON USB Control Boards
+ *
+ * The Windows drivers contain 6 different inf files, more or less one for
+ * each new device until the 0x0034-0x0046 devices, which all use the same
+ * driver. Some of the devices in the 34-46 range haven't been definitively
+ * identified yet. Early devices have either a TriGem Computer, Inc. or a
+ * Samsung vendor ID (0x0aa8 and 0x04e8 respectively), while all later
+ * devices use the SoundGraph vendor ID (0x15c2). This driver only supports
+ * the ffdc and later devices, which do onboard decoding.
+ */
+static struct usb_device_id imon_usb_id_table[] = {
+       /*
+        * Several devices with this same device ID, all use iMON_PAD.inf
+        * SoundGraph iMON PAD (IR & VFD)
+        * SoundGraph iMON PAD (IR & LCD)
+        * SoundGraph iMON Knob (IR only)
+        */
+       { USB_DEVICE(0x15c2, 0xffdc) },
+
+       /*
+        * Newer devices, all driven by the latest iMON Windows driver, full
+        * list of device IDs extracted via 'strings Setup/data1.hdr |grep 15c2'
+        * Need user input to fill in details on unknown devices.
+        */
+       /* SoundGraph iMON OEM Touch LCD (IR & 7" VGA LCD) */
+       { USB_DEVICE(0x15c2, 0x0034) },
+       /* SoundGraph iMON OEM Touch LCD (IR & 4.3" VGA LCD) */
+       { USB_DEVICE(0x15c2, 0x0035) },
+       /* SoundGraph iMON OEM VFD (IR & VFD) */
+       { USB_DEVICE(0x15c2, 0x0036) },
+       /* device specifics unknown */
+       { USB_DEVICE(0x15c2, 0x0037) },
+       /* SoundGraph iMON OEM LCD (IR & LCD) */
+       { USB_DEVICE(0x15c2, 0x0038) },
+       /* SoundGraph iMON UltraBay (IR & LCD) */
+       { USB_DEVICE(0x15c2, 0x0039) },
+       /* device specifics unknown */
+       { USB_DEVICE(0x15c2, 0x003a) },
+       /* device specifics unknown */
+       { USB_DEVICE(0x15c2, 0x003b) },
+       /* SoundGraph iMON OEM Inside (IR only) */
+       { USB_DEVICE(0x15c2, 0x003c) },
+       /* device specifics unknown */
+       { USB_DEVICE(0x15c2, 0x003d) },
+       /* device specifics unknown */
+       { USB_DEVICE(0x15c2, 0x003e) },
+       /* device specifics unknown */
+       { USB_DEVICE(0x15c2, 0x003f) },
+       /* device specifics unknown */
+       { USB_DEVICE(0x15c2, 0x0040) },
+       /* SoundGraph iMON MINI (IR only) */
+       { USB_DEVICE(0x15c2, 0x0041) },
+       /* Antec Veris Multimedia Station EZ External (IR only) */
+       { USB_DEVICE(0x15c2, 0x0042) },
+       /* Antec Veris Multimedia Station Basic Internal (IR only) */
+       { USB_DEVICE(0x15c2, 0x0043) },
+       /* Antec Veris Multimedia Station Elite (IR & VFD) */
+       { USB_DEVICE(0x15c2, 0x0044) },
+       /* Antec Veris Multimedia Station Premiere (IR & LCD) */
+       { USB_DEVICE(0x15c2, 0x0045) },
+       /* device specifics unknown */
+       { USB_DEVICE(0x15c2, 0x0046) },
+       {}
+};
+
+/* USB Device data */
+static struct usb_driver imon_driver = {
+       .name           = MOD_NAME,
+       .probe          = imon_probe,
+       .disconnect     = imon_disconnect,
+       .suspend        = imon_suspend,
+       .resume         = imon_resume,
+       .id_table       = imon_usb_id_table,
+};
+
+static struct usb_class_driver imon_vfd_class = {
+       .name           = DEVICE_NAME,
+       .fops           = &vfd_fops,
+       .minor_base     = DISPLAY_MINOR_BASE,
+};
+
+static struct usb_class_driver imon_lcd_class = {
+       .name           = DEVICE_NAME,
+       .fops           = &lcd_fops,
+       .minor_base     = DISPLAY_MINOR_BASE,
+};
+
+/* imon receiver front panel/knob key table */
+static const struct {
+       u64 hw_code;
+       u32 keycode;
+} imon_panel_key_table[] = {
+       { 0x000000000f00ffee, KEY_PROG1 }, /* Go */
+       { 0x000000001f00ffee, KEY_AUDIO },
+       { 0x000000002000ffee, KEY_VIDEO },
+       { 0x000000002100ffee, KEY_CAMERA },
+       { 0x000000002700ffee, KEY_DVD },
+       { 0x000000002300ffee, KEY_TV },
+       { 0x000000000500ffee, KEY_PREVIOUS },
+       { 0x000000000700ffee, KEY_REWIND },
+       { 0x000000000400ffee, KEY_STOP },
+       { 0x000000003c00ffee, KEY_PLAYPAUSE },
+       { 0x000000000800ffee, KEY_FASTFORWARD },
+       { 0x000000000600ffee, KEY_NEXT },
+       { 0x000000010000ffee, KEY_RIGHT },
+       { 0x000001000000ffee, KEY_LEFT },
+       { 0x000000003d00ffee, KEY_SELECT },
+       { 0x000100000000ffee, KEY_VOLUMEUP },
+       { 0x010000000000ffee, KEY_VOLUMEDOWN },
+       { 0x000000000100ffee, KEY_MUTE },
+       /* iMON Knob values */
+       { 0x000100ffffffffee, KEY_VOLUMEUP },
+       { 0x010000ffffffffee, KEY_VOLUMEDOWN },
+       { 0x000008ffffffffee, KEY_MUTE },
+};
+
+/* to prevent races between open() and disconnect(), probing, etc */
+static DEFINE_MUTEX(driver_lock);
+
+/* Module bookkeeping bits */
+MODULE_AUTHOR(MOD_AUTHOR);
+MODULE_DESCRIPTION(MOD_DESC);
+MODULE_VERSION(MOD_VERSION);
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(usb, imon_usb_id_table);
+
+static bool debug;
+module_param(debug, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(debug, "Debug messages: 0=no, 1=yes(default: no)");
+
+/* lcd, vfd, vga or none? should be auto-detected, but can be overridden... */
+static int display_type;
+module_param(display_type, int, S_IRUGO);
+MODULE_PARM_DESC(display_type, "Type of attached display. 0=autodetect, "
+                "1=vfd, 2=lcd, 3=vga, 4=none (default: autodetect)");
+
+/* IR protocol: native iMON, Windows MCE (RC-6), or iMON w/o PAD stabilize */
+static int ir_protocol;
+module_param(ir_protocol, int, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(ir_protocol, "Which IR protocol to use. 0=auto-detect, "
+                "1=Windows Media Center Ed. (RC-6), 2=iMON native, "
+                "4=iMON w/o PAD stabilize (default: auto-detect)");
+
+/*
+ * In certain use cases, mouse mode isn't really helpful, and could actually
+ * cause confusion, so allow disabling it when the IR device is open.
+ */
+static bool nomouse;
+module_param(nomouse, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(nomouse, "Disable mouse input device mode when IR device is "
+                "open. 0=don't disable, 1=disable. (default: don't disable)");
+
+/* threshold at which a pad push registers as an arrow key in kbd mode */
+static int pad_thresh;
+module_param(pad_thresh, int, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(pad_thresh, "Threshold at which a pad push registers as an "
+                "arrow key in kbd mode (default: 28)");
+
+
+static void free_imon_context(struct imon_context *ictx)
+{
+       struct device *dev = ictx->dev;
+
+       usb_free_urb(ictx->tx_urb);
+       usb_free_urb(ictx->rx_urb_intf0);
+       usb_free_urb(ictx->rx_urb_intf1);
+       kfree(ictx);
+
+       dev_dbg(dev, "%s: iMON context freed\n", __func__);
+}
+
+/**
+ * Called when the Display device (e.g. /dev/lcd0)
+ * is opened by the application.
+ */
+static int display_open(struct inode *inode, struct file *file)
+{
+       struct usb_interface *interface;
+       struct imon_context *ictx = NULL;
+       int subminor;
+       int retval = 0;
+
+       /* prevent races with disconnect */
+       mutex_lock(&driver_lock);
+
+       subminor = iminor(inode);
+       interface = usb_find_interface(&imon_driver, subminor);
+       if (!interface) {
+               err("%s: could not find interface for minor %d",
+                   __func__, subminor);
+               retval = -ENODEV;
+               goto exit;
+       }
+       ictx = usb_get_intfdata(interface);
+
+       if (!ictx) {
+               err("%s: no context found for minor %d", __func__, subminor);
+               retval = -ENODEV;
+               goto exit;
+       }
+
+       mutex_lock(&ictx->lock);
+
+       if (!ictx->display_supported) {
+               err("%s: display not supported by device", __func__);
+               retval = -ENODEV;
+       } else if (ictx->display_isopen) {
+               err("%s: display port is already open", __func__);
+               retval = -EBUSY;
+       } else {
+               ictx->display_isopen = 1;
+               file->private_data = ictx;
+               dev_dbg(ictx->dev, "display port opened\n");
+       }
+
+       mutex_unlock(&ictx->lock);
+
+exit:
+       mutex_unlock(&driver_lock);
+       return retval;
+}
+
+/**
+ * Called when the display device (e.g. /dev/lcd0)
+ * is closed by the application.
+ */
+static int display_close(struct inode *inode, struct file *file)
+{
+       struct imon_context *ictx = NULL;
+       int retval = 0;
+
+       ictx = (struct imon_context *)file->private_data;
+
+       if (!ictx) {
+               err("%s: no context for device", __func__);
+               return -ENODEV;
+       }
+
+       mutex_lock(&ictx->lock);
+
+       if (!ictx->display_supported) {
+               err("%s: display not supported by device", __func__);
+               retval = -ENODEV;
+       } else if (!ictx->display_isopen) {
+               err("%s: display is not open", __func__);
+               retval = -EIO;
+       } else {
+               ictx->display_isopen = 0;
+               dev_dbg(ictx->dev, "display port closed\n");
+               if (!ictx->dev_present_intf0) {
+                       /*
+                        * Device disconnected before close and IR port is not
+                        * open. If IR port is open, context will be deleted by
+                        * ir_close.
+                        */
+                       mutex_unlock(&ictx->lock);
+                       free_imon_context(ictx);
+                       return retval;
+               }
+       }
+
+       mutex_unlock(&ictx->lock);
+       return retval;
+}
+
+/**
+ * Sends a packet to the device -- this function must be called
+ * with ictx->lock held.
+ */
+static int send_packet(struct imon_context *ictx)
+{
+       unsigned int pipe;
+       unsigned long timeout;
+       int interval = 0;
+       int retval = 0;
+       struct usb_ctrlrequest *control_req = NULL;
+
+       /* Check if we need to use control or interrupt urb */
+       if (!ictx->tx_control) {
+               pipe = usb_sndintpipe(ictx->usbdev_intf0,
+                                     ictx->tx_endpoint->bEndpointAddress);
+               interval = ictx->tx_endpoint->bInterval;
+
+               usb_fill_int_urb(ictx->tx_urb, ictx->usbdev_intf0, pipe,
+                                ictx->usb_tx_buf,
+                                sizeof(ictx->usb_tx_buf),
+                                usb_tx_callback, ictx, interval);
+
+               ictx->tx_urb->actual_length = 0;
+       } else {
+               /* fill request into kmalloc'ed space: */
+               control_req = kmalloc(sizeof(struct usb_ctrlrequest),
+                                     GFP_KERNEL);
+               if (control_req == NULL)
+                       return -ENOMEM;
+
+               /* setup packet is '21 09 0200 0001 0008' */
+               control_req->bRequestType = 0x21;
+               control_req->bRequest = 0x09;
+               control_req->wValue = cpu_to_le16(0x0200);
+               control_req->wIndex = cpu_to_le16(0x0001);
+               control_req->wLength = cpu_to_le16(0x0008);
+
+               /* control pipe is endpoint 0x00 */
+               pipe = usb_sndctrlpipe(ictx->usbdev_intf0, 0);
+
+               /* build the control urb */
+               usb_fill_control_urb(ictx->tx_urb, ictx->usbdev_intf0,
+                                    pipe, (unsigned char *)control_req,
+                                    ictx->usb_tx_buf,
+                                    sizeof(ictx->usb_tx_buf),
+                                    usb_tx_callback, ictx);
+               ictx->tx_urb->actual_length = 0;
+       }
+
+       init_completion(&ictx->tx.finished);
+       ictx->tx.busy = 1;
+       smp_rmb(); /* ensure later readers know we're busy */
+
+       retval = usb_submit_urb(ictx->tx_urb, GFP_KERNEL);
+       if (retval) {
+               ictx->tx.busy = 0;
+               smp_rmb(); /* ensure later readers know we're not busy */
+               err("%s: error submitting urb(%d)", __func__, retval);
+       } else {
+               /* Wait for transmission to complete (or abort) */
+               mutex_unlock(&ictx->lock);
+               retval = wait_for_completion_interruptible(
+                               &ictx->tx.finished);
+               if (retval)
+                       err("%s: task interrupted", __func__);
+               mutex_lock(&ictx->lock);
+
+               retval = ictx->tx.status;
+               if (retval)
+                       err("%s: packet tx failed (%d)", __func__, retval);
+       }
+
+       kfree(control_req);
+
+       /*
+        * Induce a mandatory 5ms delay before returning, as otherwise,
+        * send_packet can get called so rapidly as to overwhelm the device,
+        * particularly on faster systems and/or those with quirky usb.
+        */
+       timeout = msecs_to_jiffies(5);
+       set_current_state(TASK_UNINTERRUPTIBLE);
+       schedule_timeout(timeout);
+
+       return retval;
+}
+
+/**
+ * Sends an associate packet to the iMON 2.4G.
+ *
+ * This might not be such a good idea, since it has an id collision with
+ * some versions of the "IR & VFD" combo. The only way to determine if it
+ * is an RF version is to look at the product description string. (Which
+ * we currently do not fetch).
+ */
+static int send_associate_24g(struct imon_context *ictx)
+{
+       int retval;
+       const unsigned char packet[8] = { 0x01, 0x00, 0x00, 0x00,
+                                         0x00, 0x00, 0x00, 0x20 };
+
+       if (!ictx) {
+               err("%s: no context for device", __func__);
+               return -ENODEV;
+       }
+
+       if (!ictx->dev_present_intf0) {
+               err("%s: no iMON device present", __func__);
+               return -ENODEV;
+       }
+
+       memcpy(ictx->usb_tx_buf, packet, sizeof(packet));
+       retval = send_packet(ictx);
+
+       return retval;
+}
+
+/**
+ * Sends packets to setup and show clock on iMON display
+ *
+ * Arguments: year - last 2 digits of year, month - 1..12,
+ * day - 1..31, dow - day of the week (0-Sun...6-Sat),
+ * hour - 0..23, minute - 0..59, second - 0..59
+ */
+static int send_set_imon_clock(struct imon_context *ictx,
+                              unsigned int year, unsigned int month,
+                              unsigned int day, unsigned int dow,
+                              unsigned int hour, unsigned int minute,
+                              unsigned int second)
+{
+       unsigned char clock_enable_pkt[IMON_CLOCK_ENABLE_PACKETS][8];
+       int retval = 0;
+       int i;
+
+       if (!ictx) {
+               err("%s: no context for device", __func__);
+               return -ENODEV;
+       }
+
+       switch (ictx->display_type) {
+       case IMON_DISPLAY_TYPE_LCD:
+               clock_enable_pkt[0][0] = 0x80;
+               clock_enable_pkt[0][1] = year;
+               clock_enable_pkt[0][2] = month-1;
+               clock_enable_pkt[0][3] = day;
+               clock_enable_pkt[0][4] = hour;
+               clock_enable_pkt[0][5] = minute;
+               clock_enable_pkt[0][6] = second;
+
+               clock_enable_pkt[1][0] = 0x80;
+               clock_enable_pkt[1][1] = 0;
+               clock_enable_pkt[1][2] = 0;
+               clock_enable_pkt[1][3] = 0;
+               clock_enable_pkt[1][4] = 0;
+               clock_enable_pkt[1][5] = 0;
+               clock_enable_pkt[1][6] = 0;
+
+               if (ictx->product == 0xffdc) {
+                       clock_enable_pkt[0][7] = 0x50;
+                       clock_enable_pkt[1][7] = 0x51;
+               } else {
+                       clock_enable_pkt[0][7] = 0x88;
+                       clock_enable_pkt[1][7] = 0x8a;
+               }
+
+               break;
+
+       case IMON_DISPLAY_TYPE_VFD:
+               clock_enable_pkt[0][0] = year;
+               clock_enable_pkt[0][1] = month-1;
+               clock_enable_pkt[0][2] = day;
+               clock_enable_pkt[0][3] = dow;
+               clock_enable_pkt[0][4] = hour;
+               clock_enable_pkt[0][5] = minute;
+               clock_enable_pkt[0][6] = second;
+               clock_enable_pkt[0][7] = 0x40;
+
+               clock_enable_pkt[1][0] = 0;
+               clock_enable_pkt[1][1] = 0;
+               clock_enable_pkt[1][2] = 1;
+               clock_enable_pkt[1][3] = 0;
+               clock_enable_pkt[1][4] = 0;
+               clock_enable_pkt[1][5] = 0;
+               clock_enable_pkt[1][6] = 0;
+               clock_enable_pkt[1][7] = 0x42;
+
+               break;
+
+       default:
+               return -ENODEV;
+       }
+
+       for (i = 0; i < IMON_CLOCK_ENABLE_PACKETS; i++) {
+               memcpy(ictx->usb_tx_buf, clock_enable_pkt[i], 8);
+               retval = send_packet(ictx);
+               if (retval) {
+                       err("%s: send_packet failed for packet %d",
+                           __func__, i);
+                       break;
+               }
+       }
+
+       return retval;
+}
+
+/**
+ * These are the sysfs functions to handle the association on the iMON 2.4G LT.
+ */
+static ssize_t show_associate_remote(struct device *d,
+                                    struct device_attribute *attr,
+                                    char *buf)
+{
+       struct imon_context *ictx = dev_get_drvdata(d);
+
+       if (!ictx)
+               return -ENODEV;
+
+       mutex_lock(&ictx->lock);
+       if (ictx->rf_isassociating)
+               strcpy(buf, "associating\n");
+       else
+               strcpy(buf, "closed\n");
+
+       dev_info(d, "Visit http://www.lirc.org/html/imon-24g.html for "
+                "instructions on how to associate your iMON 2.4G DT/LT "
+                "remote\n");
+       mutex_unlock(&ictx->lock);
+       return strlen(buf);
+}
+
+static ssize_t store_associate_remote(struct device *d,
+                                     struct device_attribute *attr,
+                                     const char *buf, size_t count)
+{
+       struct imon_context *ictx;
+
+       ictx = dev_get_drvdata(d);
+
+       if (!ictx)
+               return -ENODEV;
+
+       mutex_lock(&ictx->lock);
+       ictx->rf_isassociating = 1;
+       send_associate_24g(ictx);
+       mutex_unlock(&ictx->lock);
+
+       return count;
+}
+
+/**
+ * sysfs functions to control internal imon clock
+ */
+static ssize_t show_imon_clock(struct device *d,
+                              struct device_attribute *attr, char *buf)
+{
+       struct imon_context *ictx = dev_get_drvdata(d);
+       size_t len;
+
+       if (!ictx)
+               return -ENODEV;
+
+       mutex_lock(&ictx->lock);
+
+       if (!ictx->display_supported) {
+               len = snprintf(buf, PAGE_SIZE, "Not supported.");
+       } else {
+               len = snprintf(buf, PAGE_SIZE,
+                       "To set the clock on your iMON display:\n"
+                       "# date \"+%%y %%m %%d %%w %%H %%M %%S\" > imon_clock\n"
+                       "%s", ictx->display_isopen ?
+                       "\nNOTE: imon device must be closed\n" : "");
+       }
+
+       mutex_unlock(&ictx->lock);
+
+       return len;
+}
+
+static ssize_t store_imon_clock(struct device *d,
+                               struct device_attribute *attr,
+                               const char *buf, size_t count)
+{
+       struct imon_context *ictx = dev_get_drvdata(d);
+       ssize_t retval;
+       unsigned int year, month, day, dow, hour, minute, second;
+
+       if (!ictx)
+               return -ENODEV;
+
+       mutex_lock(&ictx->lock);
+
+       if (!ictx->display_supported) {
+               retval = -ENODEV;
+               goto exit;
+       } else if (ictx->display_isopen) {
+               retval = -EBUSY;
+               goto exit;
+       }
+
+       if (sscanf(buf, "%u %u %u %u %u %u %u", &year, &month, &day, &dow,
+                  &hour, &minute, &second) != 7) {
+               retval = -EINVAL;
+               goto exit;
+       }
+
+       if ((month < 1 || month > 12) ||
+           (day < 1 || day > 31) || (dow > 6) ||
+           (hour > 23) || (minute > 59) || (second > 59)) {
+               retval = -EINVAL;
+               goto exit;
+       }
+
+       retval = send_set_imon_clock(ictx, year, month, day, dow,
+                                    hour, minute, second);
+       if (retval)
+               goto exit;
+
+       retval = count;
+exit:
+       mutex_unlock(&ictx->lock);
+
+       return retval;
+}
+
+
+static DEVICE_ATTR(imon_clock, S_IWUSR | S_IRUGO, show_imon_clock,
+                  store_imon_clock);
+
+static DEVICE_ATTR(associate_remote, S_IWUSR | S_IRUGO, show_associate_remote,
+                  store_associate_remote);
+
+static struct attribute *imon_display_sysfs_entries[] = {
+       &dev_attr_imon_clock.attr,
+       NULL
+};
+
+static struct attribute_group imon_display_attribute_group = {
+       .attrs = imon_display_sysfs_entries
+};
+
+static struct attribute *imon_rf_sysfs_entries[] = {
+       &dev_attr_associate_remote.attr,
+       NULL
+};
+
+static struct attribute_group imon_rf_attribute_group = {
+       .attrs = imon_rf_sysfs_entries
+};
+
+/**
+ * Writes data to the VFD.  The iMON VFD is 2x16 characters
+ * and requires data in 5 consecutive USB interrupt packets,
+ * each packet but the last carrying 7 bytes.
+ *
+ * I don't know if the VFD board supports features such as
+ * scrolling, clearing rows, blanking, etc. so at
+ * the caller must provide a full screen of data.  If fewer
+ * than 32 bytes are provided spaces will be appended to
+ * generate a full screen.
+ */
+static ssize_t vfd_write(struct file *file, const char *buf,
+                        size_t n_bytes, loff_t *pos)
+{
+       int i;
+       int offset;
+       int seq;
+       int retval = 0;
+       struct imon_context *ictx;
+       const unsigned char vfd_packet6[] = {
+               0x01, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF };
+
+       ictx = (struct imon_context *)file->private_data;
+       if (!ictx) {
+               err("%s: no context for device", __func__);
+               return -ENODEV;
+       }
+
+       mutex_lock(&ictx->lock);
+
+       if (!ictx->dev_present_intf0) {
+               err("%s: no iMON device present", __func__);
+               retval = -ENODEV;
+               goto exit;
+       }
+
+       if (n_bytes <= 0 || n_bytes > 32) {
+               err("%s: invalid payload size", __func__);
+               retval = -EINVAL;
+               goto exit;
+       }
+
+       if (copy_from_user(ictx->tx.data_buf, buf, n_bytes)) {
+               retval = -EFAULT;
+               goto exit;
+       }
+
+       /* Pad with spaces */
+       for (i = n_bytes; i < 32; ++i)
+               ictx->tx.data_buf[i] = ' ';
+
+       for (i = 32; i < 35; ++i)
+               ictx->tx.data_buf[i] = 0xFF;
+
+       offset = 0;
+       seq = 0;
+
+       do {
+               memcpy(ictx->usb_tx_buf, ictx->tx.data_buf + offset, 7);
+               ictx->usb_tx_buf[7] = (unsigned char) seq;
+
+               retval = send_packet(ictx);
+               if (retval) {
+                       err("%s: send packet failed for packet #%d",
+                                       __func__, seq/2);
+                       goto exit;
+               } else {
+                       seq += 2;
+                       offset += 7;
+               }
+
+       } while (offset < 35);
+
+       /* Send packet #6 */
+       memcpy(ictx->usb_tx_buf, &vfd_packet6, sizeof(vfd_packet6));
+       ictx->usb_tx_buf[7] = (unsigned char) seq;
+       retval = send_packet(ictx);
+       if (retval)
+               err("%s: send packet failed for packet #%d",
+                   __func__, seq / 2);
+
+exit:
+       mutex_unlock(&ictx->lock);
+
+       return (!retval) ? n_bytes : retval;
+}
+
+/**
+ * Writes data to the LCD.  The iMON OEM LCD screen expects 8-byte
+ * packets. We accept data as 16 hexadecimal digits, followed by a
+ * newline (to make it easy to drive the device from a command-line
+ * -- even though the actual binary data is a bit complicated).
+ *
+ * The device itself is not a "traditional" text-mode display. It's
+ * actually a 16x96 pixel bitmap display. That means if you want to
+ * display text, you've got to have your own "font" and translate the
+ * text into bitmaps for display. This is really flexible (you can
+ * display whatever diacritics you need, and so on), but it's also
+ * a lot more complicated than most LCDs...
+ */
+static ssize_t lcd_write(struct file *file, const char *buf,
+                        size_t n_bytes, loff_t *pos)
+{
+       int retval = 0;
+       struct imon_context *ictx;
+
+       ictx = (struct imon_context *)file->private_data;
+       if (!ictx) {
+               err("%s: no context for device", __func__);
+               return -ENODEV;
+       }
+
+       mutex_lock(&ictx->lock);
+
+       if (!ictx->display_supported) {
+               err("%s: no iMON display present", __func__);
+               retval = -ENODEV;
+               goto exit;
+       }
+
+       if (n_bytes != 8) {
+               err("%s: invalid payload size: %d (expecting 8)",
+                   __func__, (int) n_bytes);
+               retval = -EINVAL;
+               goto exit;
+       }
+
+       if (copy_from_user(ictx->usb_tx_buf, buf, 8)) {
+               retval = -EFAULT;
+               goto exit;
+       }
+
+       retval = send_packet(ictx);
+       if (retval) {
+               err("%s: send packet failed!", __func__);
+               goto exit;
+       } else {
+               dev_dbg(ictx->dev, "%s: write %d bytes to LCD\n",
+                       __func__, (int) n_bytes);
+       }
+exit:
+       mutex_unlock(&ictx->lock);
+       return (!retval) ? n_bytes : retval;
+}
+
+/**
+ * Callback function for USB core API: transmit data
+ */
+static void usb_tx_callback(struct urb *urb)
+{
+       struct imon_context *ictx;
+
+       if (!urb)
+               return;
+       ictx = (struct imon_context *)urb->context;
+       if (!ictx)
+               return;
+
+       ictx->tx.status = urb->status;
+
+       /* notify waiters that write has finished */
+       ictx->tx.busy = 0;
+       smp_rmb(); /* ensure later readers know we're not busy */
+       complete(&ictx->tx.finished);
+}
+
+/**
+ * mce/rc6 keypresses have no distinct release code, use timer
+ */
+static void imon_mce_timeout(unsigned long data)
+{
+       struct imon_context *ictx = (struct imon_context *)data;
+
+       input_report_key(ictx->idev, ictx->last_keycode, 0);
+       input_sync(ictx->idev);
+}
+
+/**
+ * report touchscreen input
+ */
+static void imon_touch_display_timeout(unsigned long data)
+{
+       struct imon_context *ictx = (struct imon_context *)data;
+
+       if (!ictx->display_type == IMON_DISPLAY_TYPE_VGA)
+               return;
+
+       input_report_abs(ictx->touch, ABS_X, ictx->touch_x);
+       input_report_abs(ictx->touch, ABS_Y, ictx->touch_y);
+       input_report_key(ictx->touch, BTN_TOUCH, 0x00);
+       input_sync(ictx->touch);
+}
+
+/**
+ * iMON IR receivers support two different signal sets -- those used by
+ * the iMON remotes, and those used by the Windows MCE remotes (which is
+ * really just RC-6), but only one or the other at a time, as the signals
+ * are decoded onboard the receiver.
+ */
+static void imon_set_ir_protocol(struct imon_context *ictx)
+{
+       int retval;
+       struct device *dev = ictx->dev;
+       unsigned char ir_proto_packet[] = {
+               0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x86 };
+
+       if (ir_protocol && !(ir_protocol & ictx->ir_proto_mask))
+               dev_warn(dev, "Looks like you're trying to use an IR protocol "
+                        "this device does not support\n");
+
+       switch (ir_protocol) {
+       case IMON_IR_PROTOCOL_AUTO:
+               if (ictx->product == 0xffdc) {
+                       if (ictx->ir_proto_mask & IMON_IR_PROTO_MASK_MCE) {
+                               ir_proto_packet[0] = 0x01;
+                               ictx->ir_protocol = IMON_IR_PROTOCOL_MCE;
+                               ictx->pad_mouse = 0;
+                               init_timer(&ictx->itimer);
+                               ictx->itimer.data = (unsigned long)ictx;
+                               ictx->itimer.function = imon_mce_timeout;
+                       } else {
+                               ictx->ir_protocol = IMON_IR_PROTOCOL_IMON;
+                               ictx->pad_mouse = 1;
+                       }
+               }
+               break;
+       case IMON_IR_PROTOCOL_MCE:
+               dev_dbg(dev, "Configuring IR receiver for MCE protocol\n");
+               ir_proto_packet[0] = 0x01;
+               ictx->ir_protocol = IMON_IR_PROTOCOL_MCE;
+               ictx->pad_mouse = 0;
+               init_timer(&ictx->itimer);
+               ictx->itimer.data = (unsigned long)ictx;
+               ictx->itimer.function = imon_mce_timeout;
+               break;
+       case IMON_IR_PROTOCOL_IMON:
+               dev_dbg(dev, "Configuring IR receiver for iMON protocol\n");
+               /* ir_proto_packet[0] = 0x00; // already the default */
+               ictx->ir_protocol = IMON_IR_PROTOCOL_IMON;
+               ictx->pad_mouse = 1;
+               break;
+       case IMON_IR_PROTOCOL_IMON_NOPAD:
+               dev_dbg(dev, "Configuring IR receiver for iMON protocol "
+                       "without PAD stabilize function enabled\n");
+               /* ir_proto_packet[0] = 0x00; // already the default */
+               ictx->ir_protocol = IMON_IR_PROTOCOL_IMON_NOPAD;
+               ictx->pad_mouse = 0;
+               break;
+       default:
+               dev_info(dev, "%s: unknown IR protocol specified, will "
+                        "just default to iMON protocol\n", __func__);
+               ictx->ir_protocol = IMON_IR_PROTOCOL_IMON;
+               ictx->pad_mouse = 1;
+               break;
+       }
+
+       memcpy(ictx->usb_tx_buf, &ir_proto_packet, sizeof(ir_proto_packet));
+
+       retval = send_packet(ictx);
+       if (retval) {
+               dev_info(dev, "%s: failed to set IR protocol, falling back "
+                        "to standard iMON protocol mode\n", __func__);
+               ir_protocol = IMON_IR_PROTOCOL_IMON;
+               ictx->ir_protocol = IMON_IR_PROTOCOL_IMON;
+       }
+}
+
+static inline int tv2int(const struct timeval *a, const struct timeval *b)
+{
+       int usecs = 0;
+       int sec   = 0;
+
+       if (b->tv_usec > a->tv_usec) {
+               usecs = 1000000;
+               sec--;
+       }
+
+       usecs += a->tv_usec - b->tv_usec;
+
+       sec += a->tv_sec - b->tv_sec;
+       sec *= 1000;
+       usecs /= 1000;
+       sec += usecs;
+
+       if (sec < 0)
+               sec = 1000;
+
+       return sec;
+}
+
+/**
+ * The directional pad behaves a bit differently, depending on whether this is
+ * one of the older ffdc devices or a newer device. Newer devices appear to
+ * have a higher resolution matrix for more precise mouse movement, but it
+ * makes things overly sensitive in keyboard mode, so we do some interesting
+ * contortions to make it less touchy. Older devices run through the same
+ * routine with shorter timeout and a smaller threshold.
+ */
+static int stabilize(int a, int b, u16 timeout, u16 threshold)
+{
+       struct timeval ct;
+       static struct timeval prev_time = {0, 0};
+       static struct timeval hit_time  = {0, 0};
+       static int x, y, prev_result, hits;
+       int result = 0;
+       int msec, msec_hit;
+
+       do_gettimeofday(&ct);
+       msec = tv2int(&ct, &prev_time);
+       msec_hit = tv2int(&ct, &hit_time);
+
+       if (msec > 100) {
+               x = 0;
+               y = 0;
+               hits = 0;
+       }
+
+       x += a;
+       y += b;
+
+       prev_time = ct;
+
+       if (abs(x) > threshold || abs(y) > threshold) {
+               if (abs(y) > abs(x))
+                       result = (y > 0) ? 0x7F : 0x80;
+               else
+                       result = (x > 0) ? 0x7F00 : 0x8000;
+
+               x = 0;
+               y = 0;
+
+               if (result == prev_result) {
+                       hits++;
+
+                       if (hits > 3) {
+                               switch (result) {
+                               case 0x7F:
+                                       y = 17 * threshold / 30;
+                                       break;
+                               case 0x80:
+                                       y -= 17 * threshold / 30;
+                                       break;
+                               case 0x7F00:
+                                       x = 17 * threshold / 30;
+                                       break;
+                               case 0x8000:
+                                       x -= 17 * threshold / 30;
+                                       break;
+                               }
+                       }
+
+                       if (hits == 2 && msec_hit < timeout) {
+                               result = 0;
+                               hits = 1;
+                       }
+               } else {
+                       prev_result = result;
+                       hits = 1;
+                       hit_time = ct;
+               }
+       }
+
+       return result;
+}
+
+static u32 imon_remote_key_lookup(struct imon_context *ictx, u32 hw_code)
+{
+       u32 scancode = be32_to_cpu(hw_code);
+       u32 keycode;
+       u32 release;
+       bool is_release_code = false;
+
+       /* Look for the initial press of a button */
+       keycode = ir_g_keycode_from_table(ictx->idev, scancode);
+
+       /* Look for the release of a button */
+       if (keycode == KEY_RESERVED) {
+               release = scancode & ~0x4000;
+               keycode = ir_g_keycode_from_table(ictx->idev, release);
+               if (keycode != KEY_RESERVED)
+                       is_release_code = true;
+       }
+
+       ictx->release_code = is_release_code;
+
+       return keycode;
+}
+
+static u32 imon_mce_key_lookup(struct imon_context *ictx, u32 hw_code)
+{
+       u32 scancode = be32_to_cpu(hw_code);
+       u32 keycode;
+
+#define MCE_KEY_MASK 0x7000
+#define MCE_TOGGLE_BIT 0x8000
+
+       /*
+        * On some receivers, mce keys decode to 0x8000f04xx and 0x8000f84xx
+        * (the toggle bit flipping between alternating key presses), while
+        * on other receivers, we see 0x8000f74xx and 0x8000ff4xx. To keep
+        * the table trim, we always or in the bits to look up 0x8000ff4xx,
+        * but we can't or them into all codes, as some keys are decoded in
+        * a different way w/o the same use of the toggle bit...
+        */
+       if ((scancode >> 24) & 0x80)
+               scancode = scancode | MCE_KEY_MASK | MCE_TOGGLE_BIT;
+
+       keycode = ir_g_keycode_from_table(ictx->idev, scancode);
+
+       return keycode;
+}
+
+static u32 imon_panel_key_lookup(u64 hw_code)
+{
+       int i;
+       u64 code = be64_to_cpu(hw_code);
+       u32 keycode;
+
+       for (i = 0; i < ARRAY_SIZE(imon_panel_key_table); i++)
+               if (imon_panel_key_table[i].hw_code == (code | 0xffee))
+                       break;
+
+       keycode = imon_panel_key_table[i % IMON_KEY_RELEASE_OFFSET].keycode;
+
+       return keycode;
+}
+
+static bool imon_mouse_event(struct imon_context *ictx,
+                            unsigned char *buf, int len)
+{
+       char rel_x = 0x00, rel_y = 0x00;
+       u8 right_shift = 1;
+       bool mouse_input = 1;
+       int dir = 0;
+
+       /* newer iMON device PAD or mouse button */
+       if (ictx->product != 0xffdc && (buf[0] & 0x01) && len == 5) {
+               rel_x = buf[2];
+               rel_y = buf[3];
+               right_shift = 1;
+       /* 0xffdc iMON PAD or mouse button input */
+       } else if (ictx->product == 0xffdc && (buf[0] & 0x40) &&
+                       !((buf[1] & 0x01) || ((buf[1] >> 2) & 0x01))) {
+               rel_x = (buf[1] & 0x08) | (buf[1] & 0x10) >> 2 |
+                       (buf[1] & 0x20) >> 4 | (buf[1] & 0x40) >> 6;
+               if (buf[0] & 0x02)
+                       rel_x |= ~0x0f;
+               rel_x = rel_x + rel_x / 2;
+               rel_y = (buf[2] & 0x08) | (buf[2] & 0x10) >> 2 |
+                       (buf[2] & 0x20) >> 4 | (buf[2] & 0x40) >> 6;
+               if (buf[0] & 0x01)
+                       rel_y |= ~0x0f;
+               rel_y = rel_y + rel_y / 2;
+               right_shift = 2;
+       /* some ffdc devices decode mouse buttons differently... */
+       } else if (ictx->product == 0xffdc && (buf[0] == 0x68)) {
+               right_shift = 2;
+       /* ch+/- buttons, which we use for an emulated scroll wheel */
+       } else if (ictx->kc == KEY_CHANNELUP && (buf[2] & 0x40) != 0x40) {
+               dir = 1;
+       } else if (ictx->kc == KEY_CHANNELDOWN && (buf[2] & 0x40) != 0x40) {
+               dir = -1;
+       } else
+               mouse_input = 0;
+
+       if (mouse_input) {
+               dev_dbg(ictx->dev, "sending mouse data via input subsystem\n");
+
+               if (dir) {
+                       input_report_rel(ictx->idev, REL_WHEEL, dir);
+               } else if (rel_x || rel_y) {
+                       input_report_rel(ictx->idev, REL_X, rel_x);
+                       input_report_rel(ictx->idev, REL_Y, rel_y);
+               } else {
+                       input_report_key(ictx->idev, BTN_LEFT, buf[1] & 0x1);
+                       input_report_key(ictx->idev, BTN_RIGHT,
+                                        buf[1] >> right_shift & 0x1);
+               }
+               input_sync(ictx->idev);
+               ictx->last_keycode = ictx->kc;
+       }
+
+       return mouse_input;
+}
+
+static void imon_touch_event(struct imon_context *ictx, unsigned char *buf)
+{
+       mod_timer(&ictx->ttimer, jiffies + TOUCH_TIMEOUT);
+       ictx->touch_x = (buf[0] << 4) | (buf[1] >> 4);
+       ictx->touch_y = 0xfff - ((buf[2] << 4) | (buf[1] & 0xf));
+       input_report_abs(ictx->touch, ABS_X, ictx->touch_x);
+       input_report_abs(ictx->touch, ABS_Y, ictx->touch_y);
+       input_report_key(ictx->touch, BTN_TOUCH, 0x01);
+       input_sync(ictx->touch);
+}
+
+static void imon_pad_to_keys(struct imon_context *ictx, unsigned char *buf)
+{
+       int dir = 0;
+       char rel_x = 0x00, rel_y = 0x00;
+       u16 timeout, threshold;
+       u64 temp_key;
+       u32 remote_key;
+
+       /*
+        * The imon directional pad functions more like a touchpad. Bytes 3 & 4
+        * contain a position coordinate (x,y), with each component ranging
+        * from -14 to 14. We want to down-sample this to only 4 discrete values
+        * for up/down/left/right arrow keys. Also, when you get too close to
+        * diagonals, it has a tendancy to jump back and forth, so lets try to
+        * ignore when they get too close.
+        */
+       if (ictx->product != 0xffdc) {
+               /* first, pad to 8 bytes so it conforms with everything else */
+               buf[5] = buf[6] = buf[7] = 0;
+               timeout = 500;  /* in msecs */
+               /* (2*threshold) x (2*threshold) square */
+               threshold = pad_thresh ? pad_thresh : 28;
+               rel_x = buf[2];
+               rel_y = buf[3];
+
+               if (ictx->ir_protocol == IMON_IR_PROTOCOL_IMON) {
+                       if ((buf[1] == 0) && ((rel_x != 0) || (rel_y != 0))) {
+                               dir = stabilize((int)rel_x, (int)rel_y,
+                                               timeout, threshold);
+                               if (!dir) {
+                                       ictx->kc = KEY_UNKNOWN;
+                                       return;
+                               }
+                               buf[2] = dir & 0xFF;
+                               buf[3] = (dir >> 8) & 0xFF;
+                               memcpy(&temp_key, buf, sizeof(temp_key));
+                               remote_key = (u32) (le64_to_cpu(temp_key)
+                                                   & 0xffffffff);
+                               ictx->kc = imon_remote_key_lookup(ictx,
+                                                                 remote_key);
+                       }
+               } else {
+                       if (abs(rel_y) > abs(rel_x)) {
+                               buf[2] = (rel_y > 0) ? 0x7F : 0x80;
+                               buf[3] = 0;
+                               ictx->kc = (rel_y > 0) ? KEY_DOWN : KEY_UP;
+                       } else {
+                               buf[2] = 0;
+                               buf[3] = (rel_x > 0) ? 0x7F : 0x80;
+                               ictx->kc = (rel_x > 0) ? KEY_RIGHT : KEY_LEFT;
+                       }
+               }
+
+       /*
+        * Handle on-board decoded pad events for e.g. older VFD/iMON-Pad
+        * device (15c2:ffdc). The remote generates various codes from
+        * 0x68nnnnB7 to 0x6AnnnnB7, the left mouse button generates
+        * 0x688301b7 and the right one 0x688481b7. All other keys generate
+        * 0x2nnnnnnn. Position coordinate is encoded in buf[1] and buf[2] with
+        * reversed endianess. Extract direction from buffer, rotate endianess,
+        * adjust sign and feed the values into stabilize(). The resulting codes
+        * will be 0x01008000, 0x01007F00, which match the newer devices.
+        */
+       } else {
+               timeout = 10;   /* in msecs */
+               /* (2*threshold) x (2*threshold) square */
+               threshold = pad_thresh ? pad_thresh : 15;
+
+               /* buf[1] is x */
+               rel_x = (buf[1] & 0x08) | (buf[1] & 0x10) >> 2 |
+                       (buf[1] & 0x20) >> 4 | (buf[1] & 0x40) >> 6;
+               if (buf[0] & 0x02)
+                       rel_x |= ~0x10+1;
+               /* buf[2] is y */
+               rel_y = (buf[2] & 0x08) | (buf[2] & 0x10) >> 2 |
+                       (buf[2] & 0x20) >> 4 | (buf[2] & 0x40) >> 6;
+               if (buf[0] & 0x01)
+                       rel_y |= ~0x10+1;
+
+               buf[0] = 0x01;
+               buf[1] = buf[4] = buf[5] = buf[6] = buf[7] = 0;
+
+               if (ictx->ir_protocol == IMON_IR_PROTOCOL_IMON) {
+                       dir = stabilize((int)rel_x, (int)rel_y,
+                                       timeout, threshold);
+                       if (!dir) {
+                               ictx->kc = KEY_UNKNOWN;
+                               return;
+                       }
+                       buf[2] = dir & 0xFF;
+                       buf[3] = (dir >> 8) & 0xFF;
+                       memcpy(&temp_key, buf, sizeof(temp_key));
+                       remote_key = (u32) (le64_to_cpu(temp_key) & 0xffffffff);
+                       ictx->kc = imon_remote_key_lookup(ictx, remote_key);
+               } else {
+                       if (abs(rel_y) > abs(rel_x)) {
+                               buf[2] = (rel_y > 0) ? 0x7F : 0x80;
+                               buf[3] = 0;
+                               ictx->kc = (rel_y > 0) ? KEY_DOWN : KEY_UP;
+                       } else {
+                               buf[2] = 0;
+                               buf[3] = (rel_x > 0) ? 0x7F : 0x80;
+                               ictx->kc = (rel_x > 0) ? KEY_RIGHT : KEY_LEFT;
+                       }
+               }
+       }
+}
+
+static int imon_parse_press_type(struct imon_context *ictx,
+                                unsigned char *buf, u8 ktype)
+{
+       int press_type = 0;
+
+       /* key release of 0x02XXXXXX key */
+       if (ictx->kc == KEY_RESERVED && buf[0] == 0x02 && buf[3] == 0x00)
+               ictx->kc = ictx->last_keycode;
+
+       /* mouse button release on (some) 0xffdc devices */
+       else if (ictx->kc == KEY_RESERVED && buf[0] == 0x68 && buf[1] == 0x82 &&
+                buf[2] == 0x81 && buf[3] == 0xb7)
+               ictx->kc = ictx->last_keycode;
+
+       /* mouse button release on (some other) 0xffdc devices */
+       else if (ictx->kc == KEY_RESERVED && buf[0] == 0x01 && buf[1] == 0x00 &&
+                buf[2] == 0x81 && buf[3] == 0xb7)
+               ictx->kc = ictx->last_keycode;
+
+       /* mce-specific button handling */
+       else if (ktype == IMON_KEY_MCE) {
+               /* initial press */
+               if (ictx->kc != ictx->last_keycode
+                   || buf[2] != ictx->mce_toggle_bit) {
+                       ictx->last_keycode = ictx->kc;
+                       ictx->mce_toggle_bit = buf[2];
+                       press_type = 1;
+                       mod_timer(&ictx->itimer,
+                                 jiffies + msecs_to_jiffies(MCE_TIMEOUT_MS));
+               /* repeat */
+               } else {
+                       press_type = 2;
+                       mod_timer(&ictx->itimer,
+                                 jiffies + msecs_to_jiffies(MCE_TIMEOUT_MS));
+               }
+
+       /* incoherent or irrelevant data */
+       } else if (ictx->kc == KEY_RESERVED)
+               press_type = -EINVAL;
+
+       /* key release of 0xXXXXXXb7 key */
+       else if (ictx->release_code)
+               press_type = 0;
+
+       /* this is a button press */
+       else
+               press_type = 1;
+
+       return press_type;
+}
+
+/**
+ * Process the incoming packet
+ */
+static void imon_incoming_packet(struct imon_context *ictx,
+                                struct urb *urb, int intf)
+{
+       int len = urb->actual_length;
+       unsigned char *buf = urb->transfer_buffer;
+       struct device *dev = ictx->dev;
+       u32 kc;
+       bool norelease = 0;
+       int i;
+       u64 temp_key;
+       u64 panel_key = 0;
+       u32 remote_key = 0;
+       struct input_dev *idev = NULL;
+       int press_type = 0;
+       int msec;
+       struct timeval t;
+       static struct timeval prev_time = { 0, 0 };
+       u8 ktype = IMON_KEY_IMON;
+
+       idev = ictx->idev;
+
+       /* filter out junk data on the older 0xffdc imon devices */
+       if ((buf[0] == 0xff) && (buf[7] == 0xff))
+               return;
+
+       /* Figure out what key was pressed */
+       memcpy(&temp_key, buf, sizeof(temp_key));
+       if (len == 8 && buf[7] == 0xee) {
+               ktype = IMON_KEY_PANEL;
+               panel_key = le64_to_cpu(temp_key);
+               kc = imon_panel_key_lookup(panel_key);
+       } else {
+               remote_key = (u32) (le64_to_cpu(temp_key) & 0xffffffff);
+               if (ictx->ir_protocol == IMON_IR_PROTOCOL_MCE) {
+                       if (buf[0] == 0x80)
+                               ktype = IMON_KEY_MCE;
+                       kc = imon_mce_key_lookup(ictx, remote_key);
+               } else
+                       kc = imon_remote_key_lookup(ictx, remote_key);
+       }
+
+       /* keyboard/mouse mode toggle button */
+       if (kc == KEY_KEYBOARD && !ictx->release_code) {
+               ictx->last_keycode = kc;
+               if (!nomouse) {
+                       ictx->pad_mouse = ~(ictx->pad_mouse) & 0x1;
+                       dev_dbg(dev, "toggling to %s mode\n",
+                               ictx->pad_mouse ? "mouse" : "keyboard");
+                       return;
+               } else {
+                       ictx->pad_mouse = 0;
+                       dev_dbg(dev, "mouse mode disabled, passing key value\n");
+               }
+       }
+
+       ictx->kc = kc;
+
+       /* send touchscreen events through input subsystem if touchpad data */
+       if (ictx->display_type == IMON_DISPLAY_TYPE_VGA && len == 8 &&
+           buf[7] == 0x86) {
+               imon_touch_event(ictx, buf);
+
+       /* look for mouse events with pad in mouse mode */
+       } else if (ictx->pad_mouse) {
+               if (imon_mouse_event(ictx, buf, len))
+                       return;
+       }
+
+       /* Now for some special handling to convert pad input to arrow keys */
+       if (((len == 5) && (buf[0] == 0x01) && (buf[4] == 0x00)) ||
+           ((len == 8) && (buf[0] & 0x40) &&
+            !(buf[1] & 0x1 || buf[1] >> 2 & 0x1))) {
+               len = 8;
+               imon_pad_to_keys(ictx, buf);
+               norelease = 1;
+       }
+
+       if (debug) {
+               printk(KERN_INFO "intf%d decoded packet: ", intf);
+               for (i = 0; i < len; ++i)
+                       printk("%02x ", buf[i]);
+               printk("\n");
+       }
+
+       press_type = imon_parse_press_type(ictx, buf, ktype);
+       if (press_type < 0)
+               goto not_input_data;
+
+       if (ictx->kc == KEY_UNKNOWN)
+               goto unknown_key;
+
+       /* KEY_MUTE repeats from MCE and knob need to be suppressed */
+       if ((ictx->kc == KEY_MUTE && ictx->kc == ictx->last_keycode)
+           && (buf[7] == 0xee || ktype == IMON_KEY_MCE)) {
+               do_gettimeofday(&t);
+               msec = tv2int(&t, &prev_time);
+               prev_time = t;
+               if (msec < 200)
+                       return;
+       }
+
+       input_report_key(idev, ictx->kc, press_type);
+       input_sync(idev);
+
+       /* panel keys and some remote keys don't generate a release */
+       if (panel_key || norelease) {
+               input_report_key(idev, ictx->kc, 0);
+               input_sync(idev);
+       }
+
+       ictx->last_keycode = ictx->kc;
+
+       return;
+
+unknown_key:
+       dev_info(dev, "%s: unknown keypress, code 0x%llx\n", __func__,
+                (panel_key ? be64_to_cpu(panel_key) :
+                             be32_to_cpu(remote_key)));
+       return;
+
+not_input_data:
+       if (len != 8) {
+               dev_warn(dev, "imon %s: invalid incoming packet "
+                        "size (len = %d, intf%d)\n", __func__, len, intf);
+               return;
+       }
+
+       /* iMON 2.4G associate frame */
+       if (buf[0] == 0x00 &&
+           buf[2] == 0xFF &&                           /* REFID */
+           buf[3] == 0xFF &&
+           buf[4] == 0xFF &&
+           buf[5] == 0xFF &&                           /* iMON 2.4G */
+          ((buf[6] == 0x4E && buf[7] == 0xDF) ||       /* LT */
+           (buf[6] == 0x5E && buf[7] == 0xDF))) {      /* DT */
+               dev_warn(dev, "%s: remote associated refid=%02X\n",
+                        __func__, buf[1]);
+               ictx->rf_isassociating = 0;
+       }
+}
+
+/**
+ * Callback function for USB core API: receive data
+ */
+static void usb_rx_callback_intf0(struct urb *urb)
+{
+       struct imon_context *ictx;
+       int intfnum = 0;
+
+       if (!urb)
+               return;
+
+       ictx = (struct imon_context *)urb->context;
+       if (!ictx)
+               return;
+
+       switch (urb->status) {
+       case -ENOENT:           /* usbcore unlink successful! */
+               return;
+
+       case -ESHUTDOWN:        /* transport endpoint was shut down */
+               break;
+
+       case 0:
+               imon_incoming_packet(ictx, urb, intfnum);
+               break;
+
+       default:
+               dev_warn(ictx->dev, "imon %s: status(%d): ignored\n",
+                        __func__, urb->status);
+               break;
+       }
+
+       usb_submit_urb(ictx->rx_urb_intf0, GFP_ATOMIC);
+}
+
+static void usb_rx_callback_intf1(struct urb *urb)
+{
+       struct imon_context *ictx;
+       int intfnum = 1;
+
+       if (!urb)
+               return;
+
+       ictx = (struct imon_context *)urb->context;
+       if (!ictx)
+               return;
+
+       switch (urb->status) {
+       case -ENOENT:           /* usbcore unlink successful! */
+               return;
+
+       case -ESHUTDOWN:        /* transport endpoint was shut down */
+               break;
+
+       case 0:
+               imon_incoming_packet(ictx, urb, intfnum);
+               break;
+
+       default:
+               dev_warn(ictx->dev, "imon %s: status(%d): ignored\n",
+                        __func__, urb->status);
+               break;
+       }
+
+       usb_submit_urb(ictx->rx_urb_intf1, GFP_ATOMIC);
+}
+
+static struct input_dev *imon_init_idev(struct imon_context *ictx)
+{
+       struct input_dev *idev;
+       struct ir_dev_props *props;
+       struct ir_input_dev *ir;
+       int ret, i;
+       char *ir_codes = NULL;
+
+       if (ir_protocol == IMON_IR_PROTOCOL_MCE)
+               ir_codes = RC_MAP_IMON_MCE;
+       else
+               ir_codes = RC_MAP_IMON_PAD;
+
+       idev = input_allocate_device();
+       if (!idev) {
+               dev_err(ictx->dev, "remote input dev allocation failed\n");
+               goto idev_alloc_failed;
+       }
+
+       props = kzalloc(sizeof(struct ir_dev_props), GFP_KERNEL);
+       if (!props) {
+               dev_err(ictx->dev, "remote ir dev props allocation failed\n");
+               goto props_alloc_failed;
+       }
+
+       ir = kzalloc(sizeof(struct ir_input_dev), GFP_KERNEL);
+       if (!props) {
+               dev_err(ictx->dev, "remote ir input dev allocation failed\n");
+               goto ir_dev_alloc_failed;
+       }
+
+       snprintf(ictx->name_idev, sizeof(ictx->name_idev),
+                "iMON Remote (%04x:%04x)", ictx->vendor, ictx->product);
+       idev->name = ictx->name_idev;
+
+       usb_make_path(ictx->usbdev_intf0, ictx->phys_idev,
+                     sizeof(ictx->phys_idev));
+       strlcat(ictx->phys_idev, "/input0", sizeof(ictx->phys_idev));
+       idev->phys = ictx->phys_idev;
+
+       idev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
+
+       idev->keybit[BIT_WORD(BTN_MOUSE)] =
+               BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_RIGHT);
+       idev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y) |
+               BIT_MASK(REL_WHEEL);
+
+       /* panel and/or knob code support */
+       for (i = 0; i < ARRAY_SIZE(imon_panel_key_table); i++) {
+               u32 kc = imon_panel_key_table[i].keycode;
+               __set_bit(kc, idev->keybit);
+       }
+
+       props->driver_type = RC_DRIVER_SCANCODE;
+       props->allowed_protos = IR_TYPE_UNKNOWN;
+
+       ictx->ir = ir;
+       memcpy(&ir->dev, ictx->dev, sizeof(struct device));
+
+       usb_to_input_id(ictx->usbdev_intf0, &idev->id);
+       idev->dev.parent = ictx->dev;
+
+       input_set_drvdata(idev, ir);
+
+       ret = ir_input_register(idev, ir_codes, props, MOD_NAME);
+       if (ret < 0) {
+               dev_err(ictx->dev, "remote input dev register failed\n");
+               goto idev_register_failed;
+       }
+
+       return idev;
+
+idev_register_failed:
+       kfree(ir);
+ir_dev_alloc_failed:
+       kfree(props);
+props_alloc_failed:
+       input_free_device(idev);
+idev_alloc_failed:
+
+       return NULL;
+}
+
+static struct input_dev *imon_init_touch(struct imon_context *ictx)
+{
+       struct input_dev *touch;
+       int ret;
+
+       touch = input_allocate_device();
+       if (!touch) {
+               dev_err(ictx->dev, "touchscreen input dev allocation failed\n");
+               goto touch_alloc_failed;
+       }
+
+       snprintf(ictx->name_touch, sizeof(ictx->name_touch),
+                "iMON USB Touchscreen (%04x:%04x)",
+                ictx->vendor, ictx->product);
+       touch->name = ictx->name_touch;
+
+       usb_make_path(ictx->usbdev_intf1, ictx->phys_touch,
+                     sizeof(ictx->phys_touch));
+       strlcat(ictx->phys_touch, "/input1", sizeof(ictx->phys_touch));
+       touch->phys = ictx->phys_touch;
+
+       touch->evbit[0] =
+               BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
+       touch->keybit[BIT_WORD(BTN_TOUCH)] =
+               BIT_MASK(BTN_TOUCH);
+       input_set_abs_params(touch, ABS_X,
+                            0x00, 0xfff, 0, 0);
+       input_set_abs_params(touch, ABS_Y,
+                            0x00, 0xfff, 0, 0);
+
+       input_set_drvdata(touch, ictx);
+
+       usb_to_input_id(ictx->usbdev_intf1, &touch->id);
+       touch->dev.parent = ictx->dev;
+       ret = input_register_device(touch);
+       if (ret <  0) {
+               dev_info(ictx->dev, "touchscreen input dev register failed\n");
+               goto touch_register_failed;
+       }
+
+       return touch;
+
+touch_register_failed:
+       input_free_device(ictx->touch);
+       mutex_unlock(&ictx->lock);
+
+touch_alloc_failed:
+       return NULL;
+}
+
+static bool imon_find_endpoints(struct imon_context *ictx,
+                               struct usb_host_interface *iface_desc)
+{
+       struct usb_endpoint_descriptor *ep;
+       struct usb_endpoint_descriptor *rx_endpoint = NULL;
+       struct usb_endpoint_descriptor *tx_endpoint = NULL;
+       int ifnum = iface_desc->desc.bInterfaceNumber;
+       int num_endpts = iface_desc->desc.bNumEndpoints;
+       int i, ep_dir, ep_type;
+       bool ir_ep_found = 0;
+       bool display_ep_found = 0;
+       bool tx_control = 0;
+
+       /*
+        * Scan the endpoint list and set:
+        *      first input endpoint = IR endpoint
+        *      first output endpoint = display endpoint
+        */
+       for (i = 0; i < num_endpts && !(ir_ep_found && display_ep_found); ++i) {
+               ep = &iface_desc->endpoint[i].desc;
+               ep_dir = ep->bEndpointAddress & USB_ENDPOINT_DIR_MASK;
+               ep_type = ep->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
+
+               if (!ir_ep_found && ep_dir == USB_DIR_IN &&
+                   ep_type == USB_ENDPOINT_XFER_INT) {
+
+                       rx_endpoint = ep;
+                       ir_ep_found = 1;
+                       dev_dbg(ictx->dev, "%s: found IR endpoint\n", __func__);
+
+               } else if (!display_ep_found && ep_dir == USB_DIR_OUT &&
+                          ep_type == USB_ENDPOINT_XFER_INT) {
+                       tx_endpoint = ep;
+                       display_ep_found = 1;
+                       dev_dbg(ictx->dev, "%s: found display endpoint\n", __func__);
+               }
+       }
+
+       if (ifnum == 0) {
+               ictx->rx_endpoint_intf0 = rx_endpoint;
+               /*
+                * tx is used to send characters to lcd/vfd, associate RF
+                * remotes, set IR protocol, and maybe more...
+                */
+               ictx->tx_endpoint = tx_endpoint;
+       } else {
+               ictx->rx_endpoint_intf1 = rx_endpoint;
+       }
+
+       /*
+        * If we didn't find a display endpoint, this is probably one of the
+        * newer iMON devices that use control urb instead of interrupt
+        */
+       if (!display_ep_found) {
+               tx_control = 1;
+               display_ep_found = 1;
+               dev_dbg(ictx->dev, "%s: device uses control endpoint, not "
+                       "interface OUT endpoint\n", __func__);
+       }
+
+       /*
+        * Some iMON receivers have no display. Unfortunately, it seems
+        * that SoundGraph recycles device IDs between devices both with
+        * and without... :\
+        */
+       if (ictx->display_type == IMON_DISPLAY_TYPE_NONE) {
+               display_ep_found = 0;
+               dev_dbg(ictx->dev, "%s: device has no display\n", __func__);
+       }
+
+       /*
+        * iMON Touch devices have a VGA touchscreen, but no "display", as
+        * that refers to e.g. /dev/lcd0 (a character device LCD or VFD).
+        */
+       if (ictx->display_type == IMON_DISPLAY_TYPE_VGA) {
+               display_ep_found = 0;
+               dev_dbg(ictx->dev, "%s: iMON Touch device found\n", __func__);
+       }
+
+       /* Input endpoint is mandatory */
+       if (!ir_ep_found)
+               err("%s: no valid input (IR) endpoint found.", __func__);
+
+       ictx->tx_control = tx_control;
+
+       if (display_ep_found)
+               ictx->display_supported = true;
+
+       return ir_ep_found;
+
+}
+
+static struct imon_context *imon_init_intf0(struct usb_interface *intf)
+{
+       struct imon_context *ictx;
+       struct urb *rx_urb;
+       struct urb *tx_urb;
+       struct device *dev = &intf->dev;
+       struct usb_host_interface *iface_desc;
+       int ret;
+
+       ictx = kzalloc(sizeof(struct imon_context), GFP_KERNEL);
+       if (!ictx) {
+               dev_err(dev, "%s: kzalloc failed for context", __func__);
+               goto exit;
+       }
+       rx_urb = usb_alloc_urb(0, GFP_KERNEL);
+       if (!rx_urb) {
+               dev_err(dev, "%s: usb_alloc_urb failed for IR urb", __func__);
+               goto rx_urb_alloc_failed;
+       }
+       tx_urb = usb_alloc_urb(0, GFP_KERNEL);
+       if (!tx_urb) {
+               dev_err(dev, "%s: usb_alloc_urb failed for display urb",
+                       __func__);
+               goto tx_urb_alloc_failed;
+       }
+
+       mutex_init(&ictx->lock);
+
+       mutex_lock(&ictx->lock);
+
+       ictx->dev = dev;
+       ictx->usbdev_intf0 = usb_get_dev(interface_to_usbdev(intf));
+       ictx->dev_present_intf0 = 1;
+       ictx->rx_urb_intf0 = rx_urb;
+       ictx->tx_urb = tx_urb;
+
+       ictx->vendor  = le16_to_cpu(ictx->usbdev_intf0->descriptor.idVendor);
+       ictx->product = le16_to_cpu(ictx->usbdev_intf0->descriptor.idProduct);
+
+       iface_desc = intf->cur_altsetting;
+       if (!imon_find_endpoints(ictx, iface_desc))
+               goto find_endpoint_failed;
+
+       ictx->idev = imon_init_idev(ictx);
+       if (!ictx->idev) {
+               dev_err(dev, "%s: input device setup failed\n", __func__);
+               goto idev_setup_failed;
+       }
+
+       usb_fill_int_urb(ictx->rx_urb_intf0, ictx->usbdev_intf0,
+               usb_rcvintpipe(ictx->usbdev_intf0,
+                       ictx->rx_endpoint_intf0->bEndpointAddress),
+               ictx->usb_rx_buf, sizeof(ictx->usb_rx_buf),
+               usb_rx_callback_intf0, ictx,
+               ictx->rx_endpoint_intf0->bInterval);
+
+       ret = usb_submit_urb(ictx->rx_urb_intf0, GFP_KERNEL);
+       if (ret) {
+               err("%s: usb_submit_urb failed for intf0 (%d)",
+                   __func__, ret);
+               goto urb_submit_failed;
+       }
+
+       return ictx;
+
+urb_submit_failed:
+       input_unregister_device(ictx->idev);
+       input_free_device(ictx->idev);
+idev_setup_failed:
+find_endpoint_failed:
+       mutex_unlock(&ictx->lock);
+       usb_free_urb(tx_urb);
+tx_urb_alloc_failed:
+       usb_free_urb(rx_urb);
+rx_urb_alloc_failed:
+       kfree(ictx);
+exit:
+       dev_err(dev, "unable to initialize intf0, err %d\n", ret);
+
+       return NULL;
+}
+
+static struct imon_context *imon_init_intf1(struct usb_interface *intf,
+                                           struct imon_context *ictx)
+{
+       struct urb *rx_urb;
+       struct usb_host_interface *iface_desc;
+       int ret;
+
+       rx_urb = usb_alloc_urb(0, GFP_KERNEL);
+       if (!rx_urb) {
+               err("%s: usb_alloc_urb failed for IR urb", __func__);
+               ret = -ENOMEM;
+               goto rx_urb_alloc_failed;
+       }
+
+       mutex_lock(&ictx->lock);
+
+       if (ictx->display_type == IMON_DISPLAY_TYPE_VGA) {
+               init_timer(&ictx->ttimer);
+               ictx->ttimer.data = (unsigned long)ictx;
+               ictx->ttimer.function = imon_touch_display_timeout;
+       }
+
+       ictx->usbdev_intf1 = usb_get_dev(interface_to_usbdev(intf));
+       ictx->dev_present_intf1 = 1;
+       ictx->rx_urb_intf1 = rx_urb;
+
+       iface_desc = intf->cur_altsetting;
+       if (!imon_find_endpoints(ictx, iface_desc))
+               goto find_endpoint_failed;
+
+       if (ictx->display_type == IMON_DISPLAY_TYPE_VGA) {
+               ictx->touch = imon_init_touch(ictx);
+               if (!ictx->touch)
+                       goto touch_setup_failed;
+       } else
+               ictx->touch = NULL;
+
+       usb_fill_int_urb(ictx->rx_urb_intf1, ictx->usbdev_intf1,
+               usb_rcvintpipe(ictx->usbdev_intf1,
+                       ictx->rx_endpoint_intf1->bEndpointAddress),
+               ictx->usb_rx_buf, sizeof(ictx->usb_rx_buf),
+               usb_rx_callback_intf1, ictx,
+               ictx->rx_endpoint_intf1->bInterval);
+
+       ret = usb_submit_urb(ictx->rx_urb_intf1, GFP_KERNEL);
+
+       if (ret) {
+               err("%s: usb_submit_urb failed for intf1 (%d)",
+                   __func__, ret);
+               goto urb_submit_failed;
+       }
+
+       return ictx;
+
+urb_submit_failed:
+       if (ictx->touch) {
+               input_unregister_device(ictx->touch);
+               input_free_device(ictx->touch);
+       }
+touch_setup_failed:
+find_endpoint_failed:
+       mutex_unlock(&ictx->lock);
+       usb_free_urb(rx_urb);
+rx_urb_alloc_failed:
+       dev_err(ictx->dev, "unable to initialize intf0, err %d\n", ret);
+
+       return NULL;
+}
+
+/*
+ * The 0x15c2:0xffdc device ID was used for umpteen different imon
+ * devices, and all of them constantly spew interrupts, even when there
+ * is no actual data to report. However, byte 6 of this buffer looks like
+ * its unique across device variants, so we're trying to key off that to
+ * figure out which display type (if any) and what IR protocol the device
+ * actually supports.
+ */
+static void imon_get_ffdc_type(struct imon_context *ictx)
+{
+       u8 ffdc_cfg_byte = ictx->usb_rx_buf[6];
+       u8 detected_display_type = IMON_DISPLAY_TYPE_NONE;
+       u8 ir_proto_mask = IMON_IR_PROTO_MASK_IMON;
+
+       switch (ffdc_cfg_byte) {
+       /* iMON Knob, no display, iMON IR + vol knob */
+       case 0x21:
+               dev_info(ictx->dev, "0xffdc iMON Knob, iMON IR");
+               ictx->display_supported = false;
+               break;
+       /* iMON VFD, no IR (does have vol knob tho) */
+       case 0x35:
+               dev_info(ictx->dev, "0xffdc iMON VFD + knob, no IR");
+               detected_display_type = IMON_DISPLAY_TYPE_VFD;
+               ir_proto_mask = IMON_IR_PROTO_MASK_NONE;
+               break;
+       /* iMON VFD, iMON IR */
+       case 0x24:
+       case 0x85:
+               dev_info(ictx->dev, "0xffdc iMON VFD, iMON IR");
+               detected_display_type = IMON_DISPLAY_TYPE_VFD;
+               break;
+       /* iMON LCD, MCE IR */
+       case 0x9f:
+               dev_info(ictx->dev, "0xffdc iMON LCD, MCE IR");
+               detected_display_type = IMON_DISPLAY_TYPE_LCD;
+               ir_proto_mask = IMON_IR_PROTO_MASK_MCE;
+               break;
+       default:
+               dev_info(ictx->dev, "Unknown 0xffdc device, "
+                        "defaulting to VFD and iMON IR");
+               detected_display_type = IMON_DISPLAY_TYPE_VFD;
+               break;
+       }
+
+       printk(" (id 0x%02x)\n", ffdc_cfg_byte);
+
+       ictx->display_type = detected_display_type;
+       ictx->ir_proto_mask = ir_proto_mask;
+}
+
+static void imon_set_display_type(struct imon_context *ictx,
+                                 struct usb_interface *intf)
+{
+       u8 configured_display_type = IMON_DISPLAY_TYPE_VFD;
+
+       /*
+        * Try to auto-detect the type of display if the user hasn't set
+        * it by hand via the display_type modparam. Default is VFD.
+        */
+
+       if (display_type == IMON_DISPLAY_TYPE_AUTO) {
+               switch (ictx->product) {
+               case 0xffdc:
+                       /* set in imon_get_ffdc_type() */
+                       configured_display_type = ictx->display_type;
+                       break;
+               case 0x0034:
+               case 0x0035:
+                       configured_display_type = IMON_DISPLAY_TYPE_VGA;
+                       break;
+               case 0x0038:
+               case 0x0039:
+               case 0x0045:
+                       configured_display_type = IMON_DISPLAY_TYPE_LCD;
+                       break;
+               case 0x003c:
+               case 0x0041:
+               case 0x0042:
+               case 0x0043:
+                       configured_display_type = IMON_DISPLAY_TYPE_NONE;
+                       ictx->display_supported = false;
+                       break;
+               case 0x0036:
+               case 0x0044:
+               default:
+                       configured_display_type = IMON_DISPLAY_TYPE_VFD;
+                       break;
+               }
+       } else {
+               configured_display_type = display_type;
+               if (display_type == IMON_DISPLAY_TYPE_NONE)
+                       ictx->display_supported = false;
+               else
+                       ictx->display_supported = true;
+               dev_info(ictx->dev, "%s: overriding display type to %d via "
+                        "modparam\n", __func__, display_type);
+       }
+
+       ictx->display_type = configured_display_type;
+}
+
+static void imon_init_display(struct imon_context *ictx,
+                             struct usb_interface *intf)
+{
+       int ret;
+
+       dev_dbg(ictx->dev, "Registering iMON display with sysfs\n");
+
+       /* set up sysfs entry for built-in clock */
+       ret = sysfs_create_group(&intf->dev.kobj,
+                                &imon_display_attribute_group);
+       if (ret)
+               dev_err(ictx->dev, "Could not create display sysfs "
+                       "entries(%d)", ret);
+
+       if (ictx->display_type == IMON_DISPLAY_TYPE_LCD)
+               ret = usb_register_dev(intf, &imon_lcd_class);
+       else
+               ret = usb_register_dev(intf, &imon_vfd_class);
+       if (ret)
+               /* Not a fatal error, so ignore */
+               dev_info(ictx->dev, "could not get a minor number for "
+                        "display\n");
+
+}
+
+/**
+ * Callback function for USB core API: Probe
+ */
+static int __devinit imon_probe(struct usb_interface *interface,
+                               const struct usb_device_id *id)
+{
+       struct usb_device *usbdev = NULL;
+       struct usb_host_interface *iface_desc = NULL;
+       struct usb_interface *first_if;
+       struct device *dev = &interface->dev;
+       int ifnum, code_length, sysfs_err;
+       int ret = 0;
+       struct imon_context *ictx = NULL;
+       struct imon_context *first_if_ctx = NULL;
+       u16 vendor, product;
+       const unsigned char fp_packet[] = { 0x40, 0x00, 0x00, 0x00,
+                                           0x00, 0x00, 0x00, 0x88 };
+
+       code_length = BUF_CHUNK_SIZE * 8;
+
+       usbdev     = usb_get_dev(interface_to_usbdev(interface));
+       iface_desc = interface->cur_altsetting;
+       ifnum      = iface_desc->desc.bInterfaceNumber;
+       vendor     = le16_to_cpu(usbdev->descriptor.idVendor);
+       product    = le16_to_cpu(usbdev->descriptor.idProduct);
+
+       dev_dbg(dev, "%s: found iMON device (%04x:%04x, intf%d)\n",
+               __func__, vendor, product, ifnum);
+
+       /* prevent races probing devices w/multiple interfaces */
+       mutex_lock(&driver_lock);
+
+       first_if = usb_ifnum_to_if(usbdev, 0);
+       first_if_ctx = (struct imon_context *)usb_get_intfdata(first_if);
+
+       if (ifnum == 0) {
+               ictx = imon_init_intf0(interface);
+               if (!ictx) {
+                       err("%s: failed to initialize context!\n", __func__);
+                       ret = -ENODEV;
+                       goto fail;
+               }
+
+               if (product == 0xffdc) {
+                       /* RF products *also* use 0xffdc... sigh... */
+                       sysfs_err = sysfs_create_group(&interface->dev.kobj,
+                                                      &imon_rf_attribute_group);
+                       if (sysfs_err)
+                               err("%s: Could not create RF sysfs entries(%d)",
+                                   __func__, sysfs_err);
+               }
+
+       } else {
+       /* this is the secondary interface on the device */
+               ictx = imon_init_intf1(interface, first_if_ctx);
+               if (!ictx) {
+                       err("%s: failed to attach to context!\n", __func__);
+                       ret = -ENODEV;
+                       goto fail;
+               }
+
+       }
+
+       usb_set_intfdata(interface, ictx);
+
+       if (ifnum == 0) {
+               /* Enable front-panel buttons and/or knobs */
+               memcpy(ictx->usb_tx_buf, &fp_packet, sizeof(fp_packet));
+               ret = send_packet(ictx);
+               /* Not fatal, but warn about it */
+               if (ret)
+                       dev_info(dev, "failed to enable panel buttons "
+                                "and/or knobs\n");
+
+               if (product == 0xffdc)
+                       imon_get_ffdc_type(ictx);
+               else
+                       ictx->ir_proto_mask = IMON_IR_PROTO_MASK_MCE |
+                                             IMON_IR_PROTO_MASK_IMON;
+
+               imon_set_display_type(ictx, interface);
+
+               if (ictx->display_supported)
+                       imon_init_display(ictx, interface);
+       }
+
+       /* set IR protocol/remote type */
+       imon_set_ir_protocol(ictx);
+
+       dev_info(dev, "iMON device (%04x:%04x, intf%d) on "
+                "usb<%d:%d> initialized\n", vendor, product, ifnum,
+                usbdev->bus->busnum, usbdev->devnum);
+
+       mutex_unlock(&ictx->lock);
+       mutex_unlock(&driver_lock);
+
+       return 0;
+
+fail:
+       mutex_unlock(&driver_lock);
+       dev_err(dev, "unable to register, err %d\n", ret);
+
+       return ret;
+}
+
+/**
+ * Callback function for USB core API: disconnect
+ */
+static void __devexit imon_disconnect(struct usb_interface *interface)
+{
+       struct imon_context *ictx;
+       struct device *dev;
+       int ifnum;
+
+       /* prevent races with multi-interface device probing and display_open */
+       mutex_lock(&driver_lock);
+
+       ictx = usb_get_intfdata(interface);
+       dev = ictx->dev;
+       ifnum = interface->cur_altsetting->desc.bInterfaceNumber;
+
+       mutex_lock(&ictx->lock);
+
+       /*
+        * sysfs_remove_group is safe to call even if sysfs_create_group
+        * hasn't been called
+        */
+       sysfs_remove_group(&interface->dev.kobj,
+                          &imon_display_attribute_group);
+       sysfs_remove_group(&interface->dev.kobj,
+                          &imon_rf_attribute_group);
+
+       usb_set_intfdata(interface, NULL);
+
+       /* Abort ongoing write */
+       if (ictx->tx.busy) {
+               usb_kill_urb(ictx->tx_urb);
+               complete_all(&ictx->tx.finished);
+       }
+
+       if (ifnum == 0) {
+               ictx->dev_present_intf0 = 0;
+               usb_kill_urb(ictx->rx_urb_intf0);
+               input_unregister_device(ictx->idev);
+               if (ictx->display_supported) {
+                       if (ictx->display_type == IMON_DISPLAY_TYPE_LCD)
+                               usb_deregister_dev(interface, &imon_lcd_class);
+                       else
+                               usb_deregister_dev(interface, &imon_vfd_class);
+               }
+       } else {
+               ictx->dev_present_intf1 = 0;
+               usb_kill_urb(ictx->rx_urb_intf1);
+               if (ictx->display_type == IMON_DISPLAY_TYPE_VGA)
+                       input_unregister_device(ictx->touch);
+       }
+
+       if (!ictx->dev_present_intf0 && !ictx->dev_present_intf1) {
+               if (ictx->display_type == IMON_DISPLAY_TYPE_VGA)
+                       del_timer_sync(&ictx->ttimer);
+               mutex_unlock(&ictx->lock);
+               if (!ictx->display_isopen)
+                       free_imon_context(ictx);
+       } else {
+               if (ictx->ir_protocol == IMON_IR_PROTOCOL_MCE)
+                       del_timer_sync(&ictx->itimer);
+               mutex_unlock(&ictx->lock);
+       }
+
+       mutex_unlock(&driver_lock);
+
+       dev_dbg(dev, "%s: iMON device (intf%d) disconnected\n",
+               __func__, ifnum);
+}
+
+static int imon_suspend(struct usb_interface *intf, pm_message_t message)
+{
+       struct imon_context *ictx = usb_get_intfdata(intf);
+       int ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
+
+       if (ifnum == 0)
+               usb_kill_urb(ictx->rx_urb_intf0);
+       else
+               usb_kill_urb(ictx->rx_urb_intf1);
+
+       return 0;
+}
+
+static int imon_resume(struct usb_interface *intf)
+{
+       int rc = 0;
+       struct imon_context *ictx = usb_get_intfdata(intf);
+       int ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
+
+       if (ifnum == 0) {
+               usb_fill_int_urb(ictx->rx_urb_intf0, ictx->usbdev_intf0,
+                       usb_rcvintpipe(ictx->usbdev_intf0,
+                               ictx->rx_endpoint_intf0->bEndpointAddress),
+                       ictx->usb_rx_buf, sizeof(ictx->usb_rx_buf),
+                       usb_rx_callback_intf0, ictx,
+                       ictx->rx_endpoint_intf0->bInterval);
+
+               rc = usb_submit_urb(ictx->rx_urb_intf0, GFP_ATOMIC);
+
+       } else {
+               usb_fill_int_urb(ictx->rx_urb_intf1, ictx->usbdev_intf1,
+                       usb_rcvintpipe(ictx->usbdev_intf1,
+                               ictx->rx_endpoint_intf1->bEndpointAddress),
+                       ictx->usb_rx_buf, sizeof(ictx->usb_rx_buf),
+                       usb_rx_callback_intf1, ictx,
+                       ictx->rx_endpoint_intf1->bInterval);
+
+               rc = usb_submit_urb(ictx->rx_urb_intf1, GFP_ATOMIC);
+       }
+
+       return rc;
+}
+
+static int __init imon_init(void)
+{
+       int rc;
+
+       rc = usb_register(&imon_driver);
+       if (rc) {
+               err("%s: usb register failed(%d)", __func__, rc);
+               rc = -ENODEV;
+       }
+
+       return rc;
+}
+
+static void __exit imon_exit(void)
+{
+       usb_deregister(&imon_driver);
+}
+
+module_init(imon_init);
+module_exit(imon_exit);