Version:  2.0.40 2.2.26 2.4.37 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16

Linux/drivers/media/rc/imon.c

  1 /*
  2  *   imon.c:    input and display driver for SoundGraph iMON IR/VFD/LCD
  3  *
  4  *   Copyright(C) 2010  Jarod Wilson <jarod@wilsonet.com>
  5  *   Portions based on the original lirc_imon driver,
  6  *      Copyright(C) 2004  Venky Raju(dev@venky.ws)
  7  *
  8  *   Huge thanks to R. Geoff Newbury for invaluable debugging on the
  9  *   0xffdc iMON devices, and for sending me one to hack on, without
 10  *   which the support for them wouldn't be nearly as good. Thanks
 11  *   also to the numerous 0xffdc device owners that tested auto-config
 12  *   support for me and provided debug dumps from their devices.
 13  *
 14  *   imon is free software; you can redistribute it and/or modify
 15  *   it under the terms of the GNU General Public License as published by
 16  *   the Free Software Foundation; either version 2 of the License, or
 17  *   (at your option) any later version.
 18  *
 19  *   This program is distributed in the hope that it will be useful,
 20  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 21  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 22  *   GNU General Public License for more details.
 23  *
 24  *   You should have received a copy of the GNU General Public License
 25  *   along with this program; if not, write to the Free Software
 26  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 27  */
 28 
 29 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
 30 
 31 #include <linux/errno.h>
 32 #include <linux/init.h>
 33 #include <linux/kernel.h>
 34 #include <linux/module.h>
 35 #include <linux/slab.h>
 36 #include <linux/uaccess.h>
 37 #include <linux/ratelimit.h>
 38 
 39 #include <linux/input.h>
 40 #include <linux/usb.h>
 41 #include <linux/usb/input.h>
 42 #include <media/rc-core.h>
 43 
 44 #include <linux/time.h>
 45 #include <linux/timer.h>
 46 
 47 #define MOD_AUTHOR      "Jarod Wilson <jarod@wilsonet.com>"
 48 #define MOD_DESC        "Driver for SoundGraph iMON MultiMedia IR/Display"
 49 #define MOD_NAME        "imon"
 50 #define MOD_VERSION     "0.9.4"
 51 
 52 #define DISPLAY_MINOR_BASE      144
 53 #define DEVICE_NAME     "lcd%d"
 54 
 55 #define BUF_CHUNK_SIZE  8
 56 #define BUF_SIZE        128
 57 
 58 #define BIT_DURATION    250     /* each bit received is 250us */
 59 
 60 #define IMON_CLOCK_ENABLE_PACKETS       2
 61 
 62 /*** P R O T O T Y P E S ***/
 63 
 64 /* USB Callback prototypes */
 65 static int imon_probe(struct usb_interface *interface,
 66                       const struct usb_device_id *id);
 67 static void imon_disconnect(struct usb_interface *interface);
 68 static void usb_rx_callback_intf0(struct urb *urb);
 69 static void usb_rx_callback_intf1(struct urb *urb);
 70 static void usb_tx_callback(struct urb *urb);
 71 
 72 /* suspend/resume support */
 73 static int imon_resume(struct usb_interface *intf);
 74 static int imon_suspend(struct usb_interface *intf, pm_message_t message);
 75 
 76 /* Display file_operations function prototypes */
 77 static int display_open(struct inode *inode, struct file *file);
 78 static int display_close(struct inode *inode, struct file *file);
 79 
 80 /* VFD write operation */
 81 static ssize_t vfd_write(struct file *file, const char *buf,
 82                          size_t n_bytes, loff_t *pos);
 83 
 84 /* LCD file_operations override function prototypes */
 85 static ssize_t lcd_write(struct file *file, const char *buf,
 86                          size_t n_bytes, loff_t *pos);
 87 
 88 /*** G L O B A L S ***/
 89 
 90 struct imon_context {
 91         struct device *dev;
 92         /* Newer devices have two interfaces */
 93         struct usb_device *usbdev_intf0;
 94         struct usb_device *usbdev_intf1;
 95 
 96         bool display_supported;         /* not all controllers do */
 97         bool display_isopen;            /* display port has been opened */
 98         bool rf_device;                 /* true if iMON 2.4G LT/DT RF device */
 99         bool rf_isassociating;          /* RF remote associating */
100         bool dev_present_intf0;         /* USB device presence, interface 0 */
101         bool dev_present_intf1;         /* USB device presence, interface 1 */
102 
103         struct mutex lock;              /* to lock this object */
104         wait_queue_head_t remove_ok;    /* For unexpected USB disconnects */
105 
106         struct usb_endpoint_descriptor *rx_endpoint_intf0;
107         struct usb_endpoint_descriptor *rx_endpoint_intf1;
108         struct usb_endpoint_descriptor *tx_endpoint;
109         struct urb *rx_urb_intf0;
110         struct urb *rx_urb_intf1;
111         struct urb *tx_urb;
112         bool tx_control;
113         unsigned char usb_rx_buf[8];
114         unsigned char usb_tx_buf[8];
115         unsigned int send_packet_delay;
116 
117         struct tx_t {
118                 unsigned char data_buf[35];     /* user data buffer */
119                 struct completion finished;     /* wait for write to finish */
120                 bool busy;                      /* write in progress */
121                 int status;                     /* status of tx completion */
122         } tx;
123 
124         u16 vendor;                     /* usb vendor ID */
125         u16 product;                    /* usb product ID */
126 
127         struct rc_dev *rdev;            /* rc-core device for remote */
128         struct input_dev *idev;         /* input device for panel & IR mouse */
129         struct input_dev *touch;        /* input device for touchscreen */
130 
131         spinlock_t kc_lock;             /* make sure we get keycodes right */
132         u32 kc;                         /* current input keycode */
133         u32 last_keycode;               /* last reported input keycode */
134         u32 rc_scancode;                /* the computed remote scancode */
135         u8 rc_toggle;                   /* the computed remote toggle bit */
136         u64 rc_type;                    /* iMON or MCE (RC6) IR protocol? */
137         bool release_code;              /* some keys send a release code */
138 
139         u8 display_type;                /* store the display type */
140         bool pad_mouse;                 /* toggle kbd(0)/mouse(1) mode */
141 
142         char name_rdev[128];            /* rc input device name */
143         char phys_rdev[64];             /* rc input device phys path */
144 
145         char name_idev[128];            /* input device name */
146         char phys_idev[64];             /* input device phys path */
147 
148         char name_touch[128];           /* touch screen name */
149         char phys_touch[64];            /* touch screen phys path */
150         struct timer_list ttimer;       /* touch screen timer */
151         int touch_x;                    /* x coordinate on touchscreen */
152         int touch_y;                    /* y coordinate on touchscreen */
153 };
154 
155 #define TOUCH_TIMEOUT   (HZ/30)
156 
157 /* vfd character device file operations */
158 static const struct file_operations vfd_fops = {
159         .owner          = THIS_MODULE,
160         .open           = &display_open,
161         .write          = &vfd_write,
162         .release        = &display_close,
163         .llseek         = noop_llseek,
164 };
165 
166 /* lcd character device file operations */
167 static const struct file_operations lcd_fops = {
168         .owner          = THIS_MODULE,
169         .open           = &display_open,
170         .write          = &lcd_write,
171         .release        = &display_close,
172         .llseek         = noop_llseek,
173 };
174 
175 enum {
176         IMON_DISPLAY_TYPE_AUTO = 0,
177         IMON_DISPLAY_TYPE_VFD  = 1,
178         IMON_DISPLAY_TYPE_LCD  = 2,
179         IMON_DISPLAY_TYPE_VGA  = 3,
180         IMON_DISPLAY_TYPE_NONE = 4,
181 };
182 
183 enum {
184         IMON_KEY_IMON   = 0,
185         IMON_KEY_MCE    = 1,
186         IMON_KEY_PANEL  = 2,
187 };
188 
189 enum {
190         IMON_NEED_20MS_PKT_DELAY = 1
191 };
192 
193 /*
194  * USB Device ID for iMON USB Control Boards
195  *
196  * The Windows drivers contain 6 different inf files, more or less one for
197  * each new device until the 0x0034-0x0046 devices, which all use the same
198  * driver. Some of the devices in the 34-46 range haven't been definitively
199  * identified yet. Early devices have either a TriGem Computer, Inc. or a
200  * Samsung vendor ID (0x0aa8 and 0x04e8 respectively), while all later
201  * devices use the SoundGraph vendor ID (0x15c2). This driver only supports
202  * the ffdc and later devices, which do onboard decoding.
203  */
204 static struct usb_device_id imon_usb_id_table[] = {
205         /*
206          * Several devices with this same device ID, all use iMON_PAD.inf
207          * SoundGraph iMON PAD (IR & VFD)
208          * SoundGraph iMON PAD (IR & LCD)
209          * SoundGraph iMON Knob (IR only)
210          */
211         { USB_DEVICE(0x15c2, 0xffdc) },
212 
213         /*
214          * Newer devices, all driven by the latest iMON Windows driver, full
215          * list of device IDs extracted via 'strings Setup/data1.hdr |grep 15c2'
216          * Need user input to fill in details on unknown devices.
217          */
218         /* SoundGraph iMON OEM Touch LCD (IR & 7" VGA LCD) */
219         { USB_DEVICE(0x15c2, 0x0034) },
220         /* SoundGraph iMON OEM Touch LCD (IR & 4.3" VGA LCD) */
221         { USB_DEVICE(0x15c2, 0x0035) },
222         /* SoundGraph iMON OEM VFD (IR & VFD) */
223         { USB_DEVICE(0x15c2, 0x0036), .driver_info = IMON_NEED_20MS_PKT_DELAY },
224         /* device specifics unknown */
225         { USB_DEVICE(0x15c2, 0x0037) },
226         /* SoundGraph iMON OEM LCD (IR & LCD) */
227         { USB_DEVICE(0x15c2, 0x0038) },
228         /* SoundGraph iMON UltraBay (IR & LCD) */
229         { USB_DEVICE(0x15c2, 0x0039) },
230         /* device specifics unknown */
231         { USB_DEVICE(0x15c2, 0x003a) },
232         /* device specifics unknown */
233         { USB_DEVICE(0x15c2, 0x003b) },
234         /* SoundGraph iMON OEM Inside (IR only) */
235         { USB_DEVICE(0x15c2, 0x003c) },
236         /* device specifics unknown */
237         { USB_DEVICE(0x15c2, 0x003d) },
238         /* device specifics unknown */
239         { USB_DEVICE(0x15c2, 0x003e) },
240         /* device specifics unknown */
241         { USB_DEVICE(0x15c2, 0x003f) },
242         /* device specifics unknown */
243         { USB_DEVICE(0x15c2, 0x0040) },
244         /* SoundGraph iMON MINI (IR only) */
245         { USB_DEVICE(0x15c2, 0x0041) },
246         /* Antec Veris Multimedia Station EZ External (IR only) */
247         { USB_DEVICE(0x15c2, 0x0042) },
248         /* Antec Veris Multimedia Station Basic Internal (IR only) */
249         { USB_DEVICE(0x15c2, 0x0043) },
250         /* Antec Veris Multimedia Station Elite (IR & VFD) */
251         { USB_DEVICE(0x15c2, 0x0044) },
252         /* Antec Veris Multimedia Station Premiere (IR & LCD) */
253         { USB_DEVICE(0x15c2, 0x0045) },
254         /* device specifics unknown */
255         { USB_DEVICE(0x15c2, 0x0046) },
256         {}
257 };
258 
259 /* USB Device data */
260 static struct usb_driver imon_driver = {
261         .name           = MOD_NAME,
262         .probe          = imon_probe,
263         .disconnect     = imon_disconnect,
264         .suspend        = imon_suspend,
265         .resume         = imon_resume,
266         .id_table       = imon_usb_id_table,
267 };
268 
269 static struct usb_class_driver imon_vfd_class = {
270         .name           = DEVICE_NAME,
271         .fops           = &vfd_fops,
272         .minor_base     = DISPLAY_MINOR_BASE,
273 };
274 
275 static struct usb_class_driver imon_lcd_class = {
276         .name           = DEVICE_NAME,
277         .fops           = &lcd_fops,
278         .minor_base     = DISPLAY_MINOR_BASE,
279 };
280 
281 /* imon receiver front panel/knob key table */
282 static const struct {
283         u64 hw_code;
284         u32 keycode;
285 } imon_panel_key_table[] = {
286         { 0x000000000f00ffeell, KEY_MEDIA }, /* Go */
287         { 0x000000001200ffeell, KEY_UP },
288         { 0x000000001300ffeell, KEY_DOWN },
289         { 0x000000001400ffeell, KEY_LEFT },
290         { 0x000000001500ffeell, KEY_RIGHT },
291         { 0x000000001600ffeell, KEY_ENTER },
292         { 0x000000001700ffeell, KEY_ESC },
293         { 0x000000001f00ffeell, KEY_AUDIO },
294         { 0x000000002000ffeell, KEY_VIDEO },
295         { 0x000000002100ffeell, KEY_CAMERA },
296         { 0x000000002700ffeell, KEY_DVD },
297         { 0x000000002300ffeell, KEY_TV },
298         { 0x000000002b00ffeell, KEY_EXIT },
299         { 0x000000002c00ffeell, KEY_SELECT },
300         { 0x000000002d00ffeell, KEY_MENU },
301         { 0x000000000500ffeell, KEY_PREVIOUS },
302         { 0x000000000700ffeell, KEY_REWIND },
303         { 0x000000000400ffeell, KEY_STOP },
304         { 0x000000003c00ffeell, KEY_PLAYPAUSE },
305         { 0x000000000800ffeell, KEY_FASTFORWARD },
306         { 0x000000000600ffeell, KEY_NEXT },
307         { 0x000000010000ffeell, KEY_RIGHT },
308         { 0x000001000000ffeell, KEY_LEFT },
309         { 0x000000003d00ffeell, KEY_SELECT },
310         { 0x000100000000ffeell, KEY_VOLUMEUP },
311         { 0x010000000000ffeell, KEY_VOLUMEDOWN },
312         { 0x000000000100ffeell, KEY_MUTE },
313         /* 0xffdc iMON MCE VFD */
314         { 0x00010000ffffffeell, KEY_VOLUMEUP },
315         { 0x01000000ffffffeell, KEY_VOLUMEDOWN },
316         { 0x00000001ffffffeell, KEY_MUTE },
317         { 0x0000000fffffffeell, KEY_MEDIA },
318         { 0x00000012ffffffeell, KEY_UP },
319         { 0x00000013ffffffeell, KEY_DOWN },
320         { 0x00000014ffffffeell, KEY_LEFT },
321         { 0x00000015ffffffeell, KEY_RIGHT },
322         { 0x00000016ffffffeell, KEY_ENTER },
323         { 0x00000017ffffffeell, KEY_ESC },
324         /* iMON Knob values */
325         { 0x000100ffffffffeell, KEY_VOLUMEUP },
326         { 0x010000ffffffffeell, KEY_VOLUMEDOWN },
327         { 0x000008ffffffffeell, KEY_MUTE },
328 };
329 
330 /* to prevent races between open() and disconnect(), probing, etc */
331 static DEFINE_MUTEX(driver_lock);
332 
333 /* Module bookkeeping bits */
334 MODULE_AUTHOR(MOD_AUTHOR);
335 MODULE_DESCRIPTION(MOD_DESC);
336 MODULE_VERSION(MOD_VERSION);
337 MODULE_LICENSE("GPL");
338 MODULE_DEVICE_TABLE(usb, imon_usb_id_table);
339 
340 static bool debug;
341 module_param(debug, bool, S_IRUGO | S_IWUSR);
342 MODULE_PARM_DESC(debug, "Debug messages: 0=no, 1=yes (default: no)");
343 
344 /* lcd, vfd, vga or none? should be auto-detected, but can be overridden... */
345 static int display_type;
346 module_param(display_type, int, S_IRUGO);
347 MODULE_PARM_DESC(display_type, "Type of attached display. 0=autodetect, "
348                  "1=vfd, 2=lcd, 3=vga, 4=none (default: autodetect)");
349 
350 static int pad_stabilize = 1;
351 module_param(pad_stabilize, int, S_IRUGO | S_IWUSR);
352 MODULE_PARM_DESC(pad_stabilize, "Apply stabilization algorithm to iMON PAD "
353                  "presses in arrow key mode. 0=disable, 1=enable (default).");
354 
355 /*
356  * In certain use cases, mouse mode isn't really helpful, and could actually
357  * cause confusion, so allow disabling it when the IR device is open.
358  */
359 static bool nomouse;
360 module_param(nomouse, bool, S_IRUGO | S_IWUSR);
361 MODULE_PARM_DESC(nomouse, "Disable mouse input device mode when IR device is "
362                  "open. 0=don't disable, 1=disable. (default: don't disable)");
363 
364 /* threshold at which a pad push registers as an arrow key in kbd mode */
365 static int pad_thresh;
366 module_param(pad_thresh, int, S_IRUGO | S_IWUSR);
367 MODULE_PARM_DESC(pad_thresh, "Threshold at which a pad push registers as an "
368                  "arrow key in kbd mode (default: 28)");
369 
370 
371 static void free_imon_context(struct imon_context *ictx)
372 {
373         struct device *dev = ictx->dev;
374 
375         usb_free_urb(ictx->tx_urb);
376         usb_free_urb(ictx->rx_urb_intf0);
377         usb_free_urb(ictx->rx_urb_intf1);
378         kfree(ictx);
379 
380         dev_dbg(dev, "%s: iMON context freed\n", __func__);
381 }
382 
383 /**
384  * Called when the Display device (e.g. /dev/lcd0)
385  * is opened by the application.
386  */
387 static int display_open(struct inode *inode, struct file *file)
388 {
389         struct usb_interface *interface;
390         struct imon_context *ictx = NULL;
391         int subminor;
392         int retval = 0;
393 
394         /* prevent races with disconnect */
395         mutex_lock(&driver_lock);
396 
397         subminor = iminor(inode);
398         interface = usb_find_interface(&imon_driver, subminor);
399         if (!interface) {
400                 pr_err("could not find interface for minor %d\n", subminor);
401                 retval = -ENODEV;
402                 goto exit;
403         }
404         ictx = usb_get_intfdata(interface);
405 
406         if (!ictx) {
407                 pr_err("no context found for minor %d\n", subminor);
408                 retval = -ENODEV;
409                 goto exit;
410         }
411 
412         mutex_lock(&ictx->lock);
413 
414         if (!ictx->display_supported) {
415                 pr_err("display not supported by device\n");
416                 retval = -ENODEV;
417         } else if (ictx->display_isopen) {
418                 pr_err("display port is already open\n");
419                 retval = -EBUSY;
420         } else {
421                 ictx->display_isopen = true;
422                 file->private_data = ictx;
423                 dev_dbg(ictx->dev, "display port opened\n");
424         }
425 
426         mutex_unlock(&ictx->lock);
427 
428 exit:
429         mutex_unlock(&driver_lock);
430         return retval;
431 }
432 
433 /**
434  * Called when the display device (e.g. /dev/lcd0)
435  * is closed by the application.
436  */
437 static int display_close(struct inode *inode, struct file *file)
438 {
439         struct imon_context *ictx = NULL;
440         int retval = 0;
441 
442         ictx = file->private_data;
443 
444         if (!ictx) {
445                 pr_err("no context for device\n");
446                 return -ENODEV;
447         }
448 
449         mutex_lock(&ictx->lock);
450 
451         if (!ictx->display_supported) {
452                 pr_err("display not supported by device\n");
453                 retval = -ENODEV;
454         } else if (!ictx->display_isopen) {
455                 pr_err("display is not open\n");
456                 retval = -EIO;
457         } else {
458                 ictx->display_isopen = false;
459                 dev_dbg(ictx->dev, "display port closed\n");
460         }
461 
462         mutex_unlock(&ictx->lock);
463         return retval;
464 }
465 
466 /**
467  * Sends a packet to the device -- this function must be called with
468  * ictx->lock held, or its unlock/lock sequence while waiting for tx
469  * to complete can/will lead to a deadlock.
470  */
471 static int send_packet(struct imon_context *ictx)
472 {
473         unsigned int pipe;
474         unsigned long timeout;
475         int interval = 0;
476         int retval = 0;
477         struct usb_ctrlrequest *control_req = NULL;
478 
479         /* Check if we need to use control or interrupt urb */
480         if (!ictx->tx_control) {
481                 pipe = usb_sndintpipe(ictx->usbdev_intf0,
482                                       ictx->tx_endpoint->bEndpointAddress);
483                 interval = ictx->tx_endpoint->bInterval;
484 
485                 usb_fill_int_urb(ictx->tx_urb, ictx->usbdev_intf0, pipe,
486                                  ictx->usb_tx_buf,
487                                  sizeof(ictx->usb_tx_buf),
488                                  usb_tx_callback, ictx, interval);
489 
490                 ictx->tx_urb->actual_length = 0;
491         } else {
492                 /* fill request into kmalloc'ed space: */
493                 control_req = kmalloc(sizeof(struct usb_ctrlrequest),
494                                       GFP_KERNEL);
495                 if (control_req == NULL)
496                         return -ENOMEM;
497 
498                 /* setup packet is '21 09 0200 0001 0008' */
499                 control_req->bRequestType = 0x21;
500                 control_req->bRequest = 0x09;
501                 control_req->wValue = cpu_to_le16(0x0200);
502                 control_req->wIndex = cpu_to_le16(0x0001);
503                 control_req->wLength = cpu_to_le16(0x0008);
504 
505                 /* control pipe is endpoint 0x00 */
506                 pipe = usb_sndctrlpipe(ictx->usbdev_intf0, 0);
507 
508                 /* build the control urb */
509                 usb_fill_control_urb(ictx->tx_urb, ictx->usbdev_intf0,
510                                      pipe, (unsigned char *)control_req,
511                                      ictx->usb_tx_buf,
512                                      sizeof(ictx->usb_tx_buf),
513                                      usb_tx_callback, ictx);
514                 ictx->tx_urb->actual_length = 0;
515         }
516 
517         init_completion(&ictx->tx.finished);
518         ictx->tx.busy = true;
519         smp_rmb(); /* ensure later readers know we're busy */
520 
521         retval = usb_submit_urb(ictx->tx_urb, GFP_KERNEL);
522         if (retval) {
523                 ictx->tx.busy = false;
524                 smp_rmb(); /* ensure later readers know we're not busy */
525                 pr_err_ratelimited("error submitting urb(%d)\n", retval);
526         } else {
527                 /* Wait for transmission to complete (or abort) */
528                 mutex_unlock(&ictx->lock);
529                 retval = wait_for_completion_interruptible(
530                                 &ictx->tx.finished);
531                 if (retval) {
532                         usb_kill_urb(ictx->tx_urb);
533                         pr_err_ratelimited("task interrupted\n");
534                 }
535                 mutex_lock(&ictx->lock);
536 
537                 retval = ictx->tx.status;
538                 if (retval)
539                         pr_err_ratelimited("packet tx failed (%d)\n", retval);
540         }
541 
542         kfree(control_req);
543 
544         /*
545          * Induce a mandatory delay before returning, as otherwise,
546          * send_packet can get called so rapidly as to overwhelm the device,
547          * particularly on faster systems and/or those with quirky usb.
548          */
549         timeout = msecs_to_jiffies(ictx->send_packet_delay);
550         set_current_state(TASK_INTERRUPTIBLE);
551         schedule_timeout(timeout);
552 
553         return retval;
554 }
555 
556 /**
557  * Sends an associate packet to the iMON 2.4G.
558  *
559  * This might not be such a good idea, since it has an id collision with
560  * some versions of the "IR & VFD" combo. The only way to determine if it
561  * is an RF version is to look at the product description string. (Which
562  * we currently do not fetch).
563  */
564 static int send_associate_24g(struct imon_context *ictx)
565 {
566         int retval;
567         const unsigned char packet[8] = { 0x01, 0x00, 0x00, 0x00,
568                                           0x00, 0x00, 0x00, 0x20 };
569 
570         if (!ictx) {
571                 pr_err("no context for device\n");
572                 return -ENODEV;
573         }
574 
575         if (!ictx->dev_present_intf0) {
576                 pr_err("no iMON device present\n");
577                 return -ENODEV;
578         }
579 
580         memcpy(ictx->usb_tx_buf, packet, sizeof(packet));
581         retval = send_packet(ictx);
582 
583         return retval;
584 }
585 
586 /**
587  * Sends packets to setup and show clock on iMON display
588  *
589  * Arguments: year - last 2 digits of year, month - 1..12,
590  * day - 1..31, dow - day of the week (0-Sun...6-Sat),
591  * hour - 0..23, minute - 0..59, second - 0..59
592  */
593 static int send_set_imon_clock(struct imon_context *ictx,
594                                unsigned int year, unsigned int month,
595                                unsigned int day, unsigned int dow,
596                                unsigned int hour, unsigned int minute,
597                                unsigned int second)
598 {
599         unsigned char clock_enable_pkt[IMON_CLOCK_ENABLE_PACKETS][8];
600         int retval = 0;
601         int i;
602 
603         if (!ictx) {
604                 pr_err("no context for device\n");
605                 return -ENODEV;
606         }
607 
608         switch (ictx->display_type) {
609         case IMON_DISPLAY_TYPE_LCD:
610                 clock_enable_pkt[0][0] = 0x80;
611                 clock_enable_pkt[0][1] = year;
612                 clock_enable_pkt[0][2] = month-1;
613                 clock_enable_pkt[0][3] = day;
614                 clock_enable_pkt[0][4] = hour;
615                 clock_enable_pkt[0][5] = minute;
616                 clock_enable_pkt[0][6] = second;
617 
618                 clock_enable_pkt[1][0] = 0x80;
619                 clock_enable_pkt[1][1] = 0;
620                 clock_enable_pkt[1][2] = 0;
621                 clock_enable_pkt[1][3] = 0;
622                 clock_enable_pkt[1][4] = 0;
623                 clock_enable_pkt[1][5] = 0;
624                 clock_enable_pkt[1][6] = 0;
625 
626                 if (ictx->product == 0xffdc) {
627                         clock_enable_pkt[0][7] = 0x50;
628                         clock_enable_pkt[1][7] = 0x51;
629                 } else {
630                         clock_enable_pkt[0][7] = 0x88;
631                         clock_enable_pkt[1][7] = 0x8a;
632                 }
633 
634                 break;
635 
636         case IMON_DISPLAY_TYPE_VFD:
637                 clock_enable_pkt[0][0] = year;
638                 clock_enable_pkt[0][1] = month-1;
639                 clock_enable_pkt[0][2] = day;
640                 clock_enable_pkt[0][3] = dow;
641                 clock_enable_pkt[0][4] = hour;
642                 clock_enable_pkt[0][5] = minute;
643                 clock_enable_pkt[0][6] = second;
644                 clock_enable_pkt[0][7] = 0x40;
645 
646                 clock_enable_pkt[1][0] = 0;
647                 clock_enable_pkt[1][1] = 0;
648                 clock_enable_pkt[1][2] = 1;
649                 clock_enable_pkt[1][3] = 0;
650                 clock_enable_pkt[1][4] = 0;
651                 clock_enable_pkt[1][5] = 0;
652                 clock_enable_pkt[1][6] = 0;
653                 clock_enable_pkt[1][7] = 0x42;
654 
655                 break;
656 
657         default:
658                 return -ENODEV;
659         }
660 
661         for (i = 0; i < IMON_CLOCK_ENABLE_PACKETS; i++) {
662                 memcpy(ictx->usb_tx_buf, clock_enable_pkt[i], 8);
663                 retval = send_packet(ictx);
664                 if (retval) {
665                         pr_err("send_packet failed for packet %d\n", i);
666                         break;
667                 }
668         }
669 
670         return retval;
671 }
672 
673 /**
674  * These are the sysfs functions to handle the association on the iMON 2.4G LT.
675  */
676 static ssize_t show_associate_remote(struct device *d,
677                                      struct device_attribute *attr,
678                                      char *buf)
679 {
680         struct imon_context *ictx = dev_get_drvdata(d);
681 
682         if (!ictx)
683                 return -ENODEV;
684 
685         mutex_lock(&ictx->lock);
686         if (ictx->rf_isassociating)
687                 strcpy(buf, "associating\n");
688         else
689                 strcpy(buf, "closed\n");
690 
691         dev_info(d, "Visit http://www.lirc.org/html/imon-24g.html for "
692                  "instructions on how to associate your iMON 2.4G DT/LT "
693                  "remote\n");
694         mutex_unlock(&ictx->lock);
695         return strlen(buf);
696 }
697 
698 static ssize_t store_associate_remote(struct device *d,
699                                       struct device_attribute *attr,
700                                       const char *buf, size_t count)
701 {
702         struct imon_context *ictx;
703 
704         ictx = dev_get_drvdata(d);
705 
706         if (!ictx)
707                 return -ENODEV;
708 
709         mutex_lock(&ictx->lock);
710         ictx->rf_isassociating = true;
711         send_associate_24g(ictx);
712         mutex_unlock(&ictx->lock);
713 
714         return count;
715 }
716 
717 /**
718  * sysfs functions to control internal imon clock
719  */
720 static ssize_t show_imon_clock(struct device *d,
721                                struct device_attribute *attr, char *buf)
722 {
723         struct imon_context *ictx = dev_get_drvdata(d);
724         size_t len;
725 
726         if (!ictx)
727                 return -ENODEV;
728 
729         mutex_lock(&ictx->lock);
730 
731         if (!ictx->display_supported) {
732                 len = snprintf(buf, PAGE_SIZE, "Not supported.");
733         } else {
734                 len = snprintf(buf, PAGE_SIZE,
735                         "To set the clock on your iMON display:\n"
736                         "# date \"+%%y %%m %%d %%w %%H %%M %%S\" > imon_clock\n"
737                         "%s", ictx->display_isopen ?
738                         "\nNOTE: imon device must be closed\n" : "");
739         }
740 
741         mutex_unlock(&ictx->lock);
742 
743         return len;
744 }
745 
746 static ssize_t store_imon_clock(struct device *d,
747                                 struct device_attribute *attr,
748                                 const char *buf, size_t count)
749 {
750         struct imon_context *ictx = dev_get_drvdata(d);
751         ssize_t retval;
752         unsigned int year, month, day, dow, hour, minute, second;
753 
754         if (!ictx)
755                 return -ENODEV;
756 
757         mutex_lock(&ictx->lock);
758 
759         if (!ictx->display_supported) {
760                 retval = -ENODEV;
761                 goto exit;
762         } else if (ictx->display_isopen) {
763                 retval = -EBUSY;
764                 goto exit;
765         }
766 
767         if (sscanf(buf, "%u %u %u %u %u %u %u", &year, &month, &day, &dow,
768                    &hour, &minute, &second) != 7) {
769                 retval = -EINVAL;
770                 goto exit;
771         }
772 
773         if ((month < 1 || month > 12) ||
774             (day < 1 || day > 31) || (dow > 6) ||
775             (hour > 23) || (minute > 59) || (second > 59)) {
776                 retval = -EINVAL;
777                 goto exit;
778         }
779 
780         retval = send_set_imon_clock(ictx, year, month, day, dow,
781                                      hour, minute, second);
782         if (retval)
783                 goto exit;
784 
785         retval = count;
786 exit:
787         mutex_unlock(&ictx->lock);
788 
789         return retval;
790 }
791 
792 
793 static DEVICE_ATTR(imon_clock, S_IWUSR | S_IRUGO, show_imon_clock,
794                    store_imon_clock);
795 
796 static DEVICE_ATTR(associate_remote, S_IWUSR | S_IRUGO, show_associate_remote,
797                    store_associate_remote);
798 
799 static struct attribute *imon_display_sysfs_entries[] = {
800         &dev_attr_imon_clock.attr,
801         NULL
802 };
803 
804 static struct attribute_group imon_display_attr_group = {
805         .attrs = imon_display_sysfs_entries
806 };
807 
808 static struct attribute *imon_rf_sysfs_entries[] = {
809         &dev_attr_associate_remote.attr,
810         NULL
811 };
812 
813 static struct attribute_group imon_rf_attr_group = {
814         .attrs = imon_rf_sysfs_entries
815 };
816 
817 /**
818  * Writes data to the VFD.  The iMON VFD is 2x16 characters
819  * and requires data in 5 consecutive USB interrupt packets,
820  * each packet but the last carrying 7 bytes.
821  *
822  * I don't know if the VFD board supports features such as
823  * scrolling, clearing rows, blanking, etc. so at
824  * the caller must provide a full screen of data.  If fewer
825  * than 32 bytes are provided spaces will be appended to
826  * generate a full screen.
827  */
828 static ssize_t vfd_write(struct file *file, const char *buf,
829                          size_t n_bytes, loff_t *pos)
830 {
831         int i;
832         int offset;
833         int seq;
834         int retval = 0;
835         struct imon_context *ictx;
836         const unsigned char vfd_packet6[] = {
837                 0x01, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF };
838 
839         ictx = file->private_data;
840         if (!ictx) {
841                 pr_err_ratelimited("no context for device\n");
842                 return -ENODEV;
843         }
844 
845         mutex_lock(&ictx->lock);
846 
847         if (!ictx->dev_present_intf0) {
848                 pr_err_ratelimited("no iMON device present\n");
849                 retval = -ENODEV;
850                 goto exit;
851         }
852 
853         if (n_bytes <= 0 || n_bytes > 32) {
854                 pr_err_ratelimited("invalid payload size\n");
855                 retval = -EINVAL;
856                 goto exit;
857         }
858 
859         if (copy_from_user(ictx->tx.data_buf, buf, n_bytes)) {
860                 retval = -EFAULT;
861                 goto exit;
862         }
863 
864         /* Pad with spaces */
865         for (i = n_bytes; i < 32; ++i)
866                 ictx->tx.data_buf[i] = ' ';
867 
868         for (i = 32; i < 35; ++i)
869                 ictx->tx.data_buf[i] = 0xFF;
870 
871         offset = 0;
872         seq = 0;
873 
874         do {
875                 memcpy(ictx->usb_tx_buf, ictx->tx.data_buf + offset, 7);
876                 ictx->usb_tx_buf[7] = (unsigned char) seq;
877 
878                 retval = send_packet(ictx);
879                 if (retval) {
880                         pr_err_ratelimited("send packet #%d failed\n", seq / 2);
881                         goto exit;
882                 } else {
883                         seq += 2;
884                         offset += 7;
885                 }
886 
887         } while (offset < 35);
888 
889         /* Send packet #6 */
890         memcpy(ictx->usb_tx_buf, &vfd_packet6, sizeof(vfd_packet6));
891         ictx->usb_tx_buf[7] = (unsigned char) seq;
892         retval = send_packet(ictx);
893         if (retval)
894                 pr_err_ratelimited("send packet #%d failed\n", seq / 2);
895 
896 exit:
897         mutex_unlock(&ictx->lock);
898 
899         return (!retval) ? n_bytes : retval;
900 }
901 
902 /**
903  * Writes data to the LCD.  The iMON OEM LCD screen expects 8-byte
904  * packets. We accept data as 16 hexadecimal digits, followed by a
905  * newline (to make it easy to drive the device from a command-line
906  * -- even though the actual binary data is a bit complicated).
907  *
908  * The device itself is not a "traditional" text-mode display. It's
909  * actually a 16x96 pixel bitmap display. That means if you want to
910  * display text, you've got to have your own "font" and translate the
911  * text into bitmaps for display. This is really flexible (you can
912  * display whatever diacritics you need, and so on), but it's also
913  * a lot more complicated than most LCDs...
914  */
915 static ssize_t lcd_write(struct file *file, const char *buf,
916                          size_t n_bytes, loff_t *pos)
917 {
918         int retval = 0;
919         struct imon_context *ictx;
920 
921         ictx = file->private_data;
922         if (!ictx) {
923                 pr_err_ratelimited("no context for device\n");
924                 return -ENODEV;
925         }
926 
927         mutex_lock(&ictx->lock);
928 
929         if (!ictx->display_supported) {
930                 pr_err_ratelimited("no iMON display present\n");
931                 retval = -ENODEV;
932                 goto exit;
933         }
934 
935         if (n_bytes != 8) {
936                 pr_err_ratelimited("invalid payload size: %d (expected 8)\n",
937                                    (int)n_bytes);
938                 retval = -EINVAL;
939                 goto exit;
940         }
941 
942         if (copy_from_user(ictx->usb_tx_buf, buf, 8)) {
943                 retval = -EFAULT;
944                 goto exit;
945         }
946 
947         retval = send_packet(ictx);
948         if (retval) {
949                 pr_err_ratelimited("send packet failed!\n");
950                 goto exit;
951         } else {
952                 dev_dbg(ictx->dev, "%s: write %d bytes to LCD\n",
953                         __func__, (int) n_bytes);
954         }
955 exit:
956         mutex_unlock(&ictx->lock);
957         return (!retval) ? n_bytes : retval;
958 }
959 
960 /**
961  * Callback function for USB core API: transmit data
962  */
963 static void usb_tx_callback(struct urb *urb)
964 {
965         struct imon_context *ictx;
966 
967         if (!urb)
968                 return;
969         ictx = (struct imon_context *)urb->context;
970         if (!ictx)
971                 return;
972 
973         ictx->tx.status = urb->status;
974 
975         /* notify waiters that write has finished */
976         ictx->tx.busy = false;
977         smp_rmb(); /* ensure later readers know we're not busy */
978         complete(&ictx->tx.finished);
979 }
980 
981 /**
982  * report touchscreen input
983  */
984 static void imon_touch_display_timeout(unsigned long data)
985 {
986         struct imon_context *ictx = (struct imon_context *)data;
987 
988         if (ictx->display_type != IMON_DISPLAY_TYPE_VGA)
989                 return;
990 
991         input_report_abs(ictx->touch, ABS_X, ictx->touch_x);
992         input_report_abs(ictx->touch, ABS_Y, ictx->touch_y);
993         input_report_key(ictx->touch, BTN_TOUCH, 0x00);
994         input_sync(ictx->touch);
995 }
996 
997 /**
998  * iMON IR receivers support two different signal sets -- those used by
999  * the iMON remotes, and those used by the Windows MCE remotes (which is
1000  * really just RC-6), but only one or the other at a time, as the signals
1001  * are decoded onboard the receiver.
1002  *
1003  * This function gets called two different ways, one way is from
1004  * rc_register_device, for initial protocol selection/setup, and the other is
1005  * via a userspace-initiated protocol change request, either by direct sysfs
1006  * prodding or by something like ir-keytable. In the rc_register_device case,
1007  * the imon context lock is already held, but when initiated from userspace,
1008  * it is not, so we must acquire it prior to calling send_packet, which
1009  * requires that the lock is held.
1010  */
1011 static int imon_ir_change_protocol(struct rc_dev *rc, u64 *rc_type)
1012 {
1013         int retval;
1014         struct imon_context *ictx = rc->priv;
1015         struct device *dev = ictx->dev;
1016         bool unlock = false;
1017         unsigned char ir_proto_packet[] = {
1018                 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x86 };
1019 
1020         if (*rc_type && !rc_protocols_allowed(rc, *rc_type))
1021                 dev_warn(dev, "Looks like you're trying to use an IR protocol "
1022                          "this device does not support\n");
1023 
1024         if (*rc_type & RC_BIT_RC6_MCE) {
1025                 dev_dbg(dev, "Configuring IR receiver for MCE protocol\n");
1026                 ir_proto_packet[0] = 0x01;
1027                 *rc_type = RC_BIT_RC6_MCE;
1028         } else if (*rc_type & RC_BIT_OTHER) {
1029                 dev_dbg(dev, "Configuring IR receiver for iMON protocol\n");
1030                 if (!pad_stabilize)
1031                         dev_dbg(dev, "PAD stabilize functionality disabled\n");
1032                 /* ir_proto_packet[0] = 0x00; // already the default */
1033                 *rc_type = RC_BIT_OTHER;
1034         } else {
1035                 dev_warn(dev, "Unsupported IR protocol specified, overriding "
1036                          "to iMON IR protocol\n");
1037                 if (!pad_stabilize)
1038                         dev_dbg(dev, "PAD stabilize functionality disabled\n");
1039                 /* ir_proto_packet[0] = 0x00; // already the default */
1040                 *rc_type = RC_BIT_OTHER;
1041         }
1042 
1043         memcpy(ictx->usb_tx_buf, &ir_proto_packet, sizeof(ir_proto_packet));
1044 
1045         if (!mutex_is_locked(&ictx->lock)) {
1046                 unlock = true;
1047                 mutex_lock(&ictx->lock);
1048         }
1049 
1050         retval = send_packet(ictx);
1051         if (retval)
1052                 goto out;
1053 
1054         ictx->rc_type = *rc_type;
1055         ictx->pad_mouse = false;
1056 
1057 out:
1058         if (unlock)
1059                 mutex_unlock(&ictx->lock);
1060 
1061         return retval;
1062 }
1063 
1064 static inline int tv2int(const struct timeval *a, const struct timeval *b)
1065 {
1066         int usecs = 0;
1067         int sec   = 0;
1068 
1069         if (b->tv_usec > a->tv_usec) {
1070                 usecs = 1000000;
1071                 sec--;
1072         }
1073 
1074         usecs += a->tv_usec - b->tv_usec;
1075 
1076         sec += a->tv_sec - b->tv_sec;
1077         sec *= 1000;
1078         usecs /= 1000;
1079         sec += usecs;
1080 
1081         if (sec < 0)
1082                 sec = 1000;
1083 
1084         return sec;
1085 }
1086 
1087 /**
1088  * The directional pad behaves a bit differently, depending on whether this is
1089  * one of the older ffdc devices or a newer device. Newer devices appear to
1090  * have a higher resolution matrix for more precise mouse movement, but it
1091  * makes things overly sensitive in keyboard mode, so we do some interesting
1092  * contortions to make it less touchy. Older devices run through the same
1093  * routine with shorter timeout and a smaller threshold.
1094  */
1095 static int stabilize(int a, int b, u16 timeout, u16 threshold)
1096 {
1097         struct timeval ct;
1098         static struct timeval prev_time = {0, 0};
1099         static struct timeval hit_time  = {0, 0};
1100         static int x, y, prev_result, hits;
1101         int result = 0;
1102         int msec, msec_hit;
1103 
1104         do_gettimeofday(&ct);
1105         msec = tv2int(&ct, &prev_time);
1106         msec_hit = tv2int(&ct, &hit_time);
1107 
1108         if (msec > 100) {
1109                 x = 0;
1110                 y = 0;
1111                 hits = 0;
1112         }
1113 
1114         x += a;
1115         y += b;
1116 
1117         prev_time = ct;
1118 
1119         if (abs(x) > threshold || abs(y) > threshold) {
1120                 if (abs(y) > abs(x))
1121                         result = (y > 0) ? 0x7F : 0x80;
1122                 else
1123                         result = (x > 0) ? 0x7F00 : 0x8000;
1124 
1125                 x = 0;
1126                 y = 0;
1127 
1128                 if (result == prev_result) {
1129                         hits++;
1130 
1131                         if (hits > 3) {
1132                                 switch (result) {
1133                                 case 0x7F:
1134                                         y = 17 * threshold / 30;
1135                                         break;
1136                                 case 0x80:
1137                                         y -= 17 * threshold / 30;
1138                                         break;
1139                                 case 0x7F00:
1140                                         x = 17 * threshold / 30;
1141                                         break;
1142                                 case 0x8000:
1143                                         x -= 17 * threshold / 30;
1144                                         break;
1145                                 }
1146                         }
1147 
1148                         if (hits == 2 && msec_hit < timeout) {
1149                                 result = 0;
1150                                 hits = 1;
1151                         }
1152                 } else {
1153                         prev_result = result;
1154                         hits = 1;
1155                         hit_time = ct;
1156                 }
1157         }
1158 
1159         return result;
1160 }
1161 
1162 static u32 imon_remote_key_lookup(struct imon_context *ictx, u32 scancode)
1163 {
1164         u32 keycode;
1165         u32 release;
1166         bool is_release_code = false;
1167 
1168         /* Look for the initial press of a button */
1169         keycode = rc_g_keycode_from_table(ictx->rdev, scancode);
1170         ictx->rc_toggle = 0x0;
1171         ictx->rc_scancode = scancode;
1172 
1173         /* Look for the release of a button */
1174         if (keycode == KEY_RESERVED) {
1175                 release = scancode & ~0x4000;
1176                 keycode = rc_g_keycode_from_table(ictx->rdev, release);
1177                 if (keycode != KEY_RESERVED)
1178                         is_release_code = true;
1179         }
1180 
1181         ictx->release_code = is_release_code;
1182 
1183         return keycode;
1184 }
1185 
1186 static u32 imon_mce_key_lookup(struct imon_context *ictx, u32 scancode)
1187 {
1188         u32 keycode;
1189 
1190 #define MCE_KEY_MASK 0x7000
1191 #define MCE_TOGGLE_BIT 0x8000
1192 
1193         /*
1194          * On some receivers, mce keys decode to 0x8000f04xx and 0x8000f84xx
1195          * (the toggle bit flipping between alternating key presses), while
1196          * on other receivers, we see 0x8000f74xx and 0x8000ff4xx. To keep
1197          * the table trim, we always or in the bits to look up 0x8000ff4xx,
1198          * but we can't or them into all codes, as some keys are decoded in
1199          * a different way w/o the same use of the toggle bit...
1200          */
1201         if (scancode & 0x80000000)
1202                 scancode = scancode | MCE_KEY_MASK | MCE_TOGGLE_BIT;
1203 
1204         ictx->rc_scancode = scancode;
1205         keycode = rc_g_keycode_from_table(ictx->rdev, scancode);
1206 
1207         /* not used in mce mode, but make sure we know its false */
1208         ictx->release_code = false;
1209 
1210         return keycode;
1211 }
1212 
1213 static u32 imon_panel_key_lookup(u64 code)
1214 {
1215         int i;
1216         u32 keycode = KEY_RESERVED;
1217 
1218         for (i = 0; i < ARRAY_SIZE(imon_panel_key_table); i++) {
1219                 if (imon_panel_key_table[i].hw_code == (code | 0xffee)) {
1220                         keycode = imon_panel_key_table[i].keycode;
1221                         break;
1222                 }
1223         }
1224 
1225         return keycode;
1226 }
1227 
1228 static bool imon_mouse_event(struct imon_context *ictx,
1229                              unsigned char *buf, int len)
1230 {
1231         signed char rel_x = 0x00, rel_y = 0x00;
1232         u8 right_shift = 1;
1233         bool mouse_input = true;
1234         int dir = 0;
1235         unsigned long flags;
1236 
1237         spin_lock_irqsave(&ictx->kc_lock, flags);
1238 
1239         /* newer iMON device PAD or mouse button */
1240         if (ictx->product != 0xffdc && (buf[0] & 0x01) && len == 5) {
1241                 rel_x = buf[2];
1242                 rel_y = buf[3];
1243                 right_shift = 1;
1244         /* 0xffdc iMON PAD or mouse button input */
1245         } else if (ictx->product == 0xffdc && (buf[0] & 0x40) &&
1246                         !((buf[1] & 0x01) || ((buf[1] >> 2) & 0x01))) {
1247                 rel_x = (buf[1] & 0x08) | (buf[1] & 0x10) >> 2 |
1248                         (buf[1] & 0x20) >> 4 | (buf[1] & 0x40) >> 6;
1249                 if (buf[0] & 0x02)
1250                         rel_x |= ~0x0f;
1251                 rel_x = rel_x + rel_x / 2;
1252                 rel_y = (buf[2] & 0x08) | (buf[2] & 0x10) >> 2 |
1253                         (buf[2] & 0x20) >> 4 | (buf[2] & 0x40) >> 6;
1254                 if (buf[0] & 0x01)
1255                         rel_y |= ~0x0f;
1256                 rel_y = rel_y + rel_y / 2;
1257                 right_shift = 2;
1258         /* some ffdc devices decode mouse buttons differently... */
1259         } else if (ictx->product == 0xffdc && (buf[0] == 0x68)) {
1260                 right_shift = 2;
1261         /* ch+/- buttons, which we use for an emulated scroll wheel */
1262         } else if (ictx->kc == KEY_CHANNELUP && (buf[2] & 0x40) != 0x40) {
1263                 dir = 1;
1264         } else if (ictx->kc == KEY_CHANNELDOWN && (buf[2] & 0x40) != 0x40) {
1265                 dir = -1;
1266         } else
1267                 mouse_input = false;
1268 
1269         spin_unlock_irqrestore(&ictx->kc_lock, flags);
1270 
1271         if (mouse_input) {
1272                 dev_dbg(ictx->dev, "sending mouse data via input subsystem\n");
1273 
1274                 if (dir) {
1275                         input_report_rel(ictx->idev, REL_WHEEL, dir);
1276                 } else if (rel_x || rel_y) {
1277                         input_report_rel(ictx->idev, REL_X, rel_x);
1278                         input_report_rel(ictx->idev, REL_Y, rel_y);
1279                 } else {
1280                         input_report_key(ictx->idev, BTN_LEFT, buf[1] & 0x1);
1281                         input_report_key(ictx->idev, BTN_RIGHT,
1282                                          buf[1] >> right_shift & 0x1);
1283                 }
1284                 input_sync(ictx->idev);
1285                 spin_lock_irqsave(&ictx->kc_lock, flags);
1286                 ictx->last_keycode = ictx->kc;
1287                 spin_unlock_irqrestore(&ictx->kc_lock, flags);
1288         }
1289 
1290         return mouse_input;
1291 }
1292 
1293 static void imon_touch_event(struct imon_context *ictx, unsigned char *buf)
1294 {
1295         mod_timer(&ictx->ttimer, jiffies + TOUCH_TIMEOUT);
1296         ictx->touch_x = (buf[0] << 4) | (buf[1] >> 4);
1297         ictx->touch_y = 0xfff - ((buf[2] << 4) | (buf[1] & 0xf));
1298         input_report_abs(ictx->touch, ABS_X, ictx->touch_x);
1299         input_report_abs(ictx->touch, ABS_Y, ictx->touch_y);
1300         input_report_key(ictx->touch, BTN_TOUCH, 0x01);
1301         input_sync(ictx->touch);
1302 }
1303 
1304 static void imon_pad_to_keys(struct imon_context *ictx, unsigned char *buf)
1305 {
1306         int dir = 0;
1307         signed char rel_x = 0x00, rel_y = 0x00;
1308         u16 timeout, threshold;
1309         u32 scancode = KEY_RESERVED;
1310         unsigned long flags;
1311 
1312         /*
1313          * The imon directional pad functions more like a touchpad. Bytes 3 & 4
1314          * contain a position coordinate (x,y), with each component ranging
1315          * from -14 to 14. We want to down-sample this to only 4 discrete values
1316          * for up/down/left/right arrow keys. Also, when you get too close to
1317          * diagonals, it has a tendency to jump back and forth, so lets try to
1318          * ignore when they get too close.
1319          */
1320         if (ictx->product != 0xffdc) {
1321                 /* first, pad to 8 bytes so it conforms with everything else */
1322                 buf[5] = buf[6] = buf[7] = 0;
1323                 timeout = 500;  /* in msecs */
1324                 /* (2*threshold) x (2*threshold) square */
1325                 threshold = pad_thresh ? pad_thresh : 28;
1326                 rel_x = buf[2];
1327                 rel_y = buf[3];
1328 
1329                 if (ictx->rc_type == RC_BIT_OTHER && pad_stabilize) {
1330                         if ((buf[1] == 0) && ((rel_x != 0) || (rel_y != 0))) {
1331                                 dir = stabilize((int)rel_x, (int)rel_y,
1332                                                 timeout, threshold);
1333                                 if (!dir) {
1334                                         spin_lock_irqsave(&ictx->kc_lock,
1335                                                           flags);
1336                                         ictx->kc = KEY_UNKNOWN;
1337                                         spin_unlock_irqrestore(&ictx->kc_lock,
1338                                                                flags);
1339                                         return;
1340                                 }
1341                                 buf[2] = dir & 0xFF;
1342                                 buf[3] = (dir >> 8) & 0xFF;
1343                                 scancode = be32_to_cpu(*((u32 *)buf));
1344                         }
1345                 } else {
1346                         /*
1347                          * Hack alert: instead of using keycodes, we have
1348                          * to use hard-coded scancodes here...
1349                          */
1350                         if (abs(rel_y) > abs(rel_x)) {
1351                                 buf[2] = (rel_y > 0) ? 0x7F : 0x80;
1352                                 buf[3] = 0;
1353                                 if (rel_y > 0)
1354                                         scancode = 0x01007f00; /* KEY_DOWN */
1355                                 else
1356                                         scancode = 0x01008000; /* KEY_UP */
1357                         } else {
1358                                 buf[2] = 0;
1359                                 buf[3] = (rel_x > 0) ? 0x7F : 0x80;
1360                                 if (rel_x > 0)
1361                                         scancode = 0x0100007f; /* KEY_RIGHT */
1362                                 else
1363                                         scancode = 0x01000080; /* KEY_LEFT */
1364                         }
1365                 }
1366 
1367         /*
1368          * Handle on-board decoded pad events for e.g. older VFD/iMON-Pad
1369          * device (15c2:ffdc). The remote generates various codes from
1370          * 0x68nnnnB7 to 0x6AnnnnB7, the left mouse button generates
1371          * 0x688301b7 and the right one 0x688481b7. All other keys generate
1372          * 0x2nnnnnnn. Position coordinate is encoded in buf[1] and buf[2] with
1373          * reversed endianness. Extract direction from buffer, rotate endianness,
1374          * adjust sign and feed the values into stabilize(). The resulting codes
1375          * will be 0x01008000, 0x01007F00, which match the newer devices.
1376          */
1377         } else {
1378                 timeout = 10;   /* in msecs */
1379                 /* (2*threshold) x (2*threshold) square */
1380                 threshold = pad_thresh ? pad_thresh : 15;
1381 
1382                 /* buf[1] is x */
1383                 rel_x = (buf[1] & 0x08) | (buf[1] & 0x10) >> 2 |
1384                         (buf[1] & 0x20) >> 4 | (buf[1] & 0x40) >> 6;
1385                 if (buf[0] & 0x02)
1386                         rel_x |= ~0x10+1;
1387                 /* buf[2] is y */
1388                 rel_y = (buf[2] & 0x08) | (buf[2] & 0x10) >> 2 |
1389                         (buf[2] & 0x20) >> 4 | (buf[2] & 0x40) >> 6;
1390                 if (buf[0] & 0x01)
1391                         rel_y |= ~0x10+1;
1392 
1393                 buf[0] = 0x01;
1394                 buf[1] = buf[4] = buf[5] = buf[6] = buf[7] = 0;
1395 
1396                 if (ictx->rc_type == RC_BIT_OTHER && pad_stabilize) {
1397                         dir = stabilize((int)rel_x, (int)rel_y,
1398                                         timeout, threshold);
1399                         if (!dir) {
1400                                 spin_lock_irqsave(&ictx->kc_lock, flags);
1401                                 ictx->kc = KEY_UNKNOWN;
1402                                 spin_unlock_irqrestore(&ictx->kc_lock, flags);
1403                                 return;
1404                         }
1405                         buf[2] = dir & 0xFF;
1406                         buf[3] = (dir >> 8) & 0xFF;
1407                         scancode = be32_to_cpu(*((u32 *)buf));
1408                 } else {
1409                         /*
1410                          * Hack alert: instead of using keycodes, we have
1411                          * to use hard-coded scancodes here...
1412                          */
1413                         if (abs(rel_y) > abs(rel_x)) {
1414                                 buf[2] = (rel_y > 0) ? 0x7F : 0x80;
1415                                 buf[3] = 0;
1416                                 if (rel_y > 0)
1417                                         scancode = 0x01007f00; /* KEY_DOWN */
1418                                 else
1419                                         scancode = 0x01008000; /* KEY_UP */
1420                         } else {
1421                                 buf[2] = 0;
1422                                 buf[3] = (rel_x > 0) ? 0x7F : 0x80;
1423                                 if (rel_x > 0)
1424                                         scancode = 0x0100007f; /* KEY_RIGHT */
1425                                 else
1426                                         scancode = 0x01000080; /* KEY_LEFT */
1427                         }
1428                 }
1429         }
1430 
1431         if (scancode) {
1432                 spin_lock_irqsave(&ictx->kc_lock, flags);
1433                 ictx->kc = imon_remote_key_lookup(ictx, scancode);
1434                 spin_unlock_irqrestore(&ictx->kc_lock, flags);
1435         }
1436 }
1437 
1438 /**
1439  * figure out if these is a press or a release. We don't actually
1440  * care about repeats, as those will be auto-generated within the IR
1441  * subsystem for repeating scancodes.
1442  */
1443 static int imon_parse_press_type(struct imon_context *ictx,
1444                                  unsigned char *buf, u8 ktype)
1445 {
1446         int press_type = 0;
1447         unsigned long flags;
1448 
1449         spin_lock_irqsave(&ictx->kc_lock, flags);
1450 
1451         /* key release of 0x02XXXXXX key */
1452         if (ictx->kc == KEY_RESERVED && buf[0] == 0x02 && buf[3] == 0x00)
1453                 ictx->kc = ictx->last_keycode;
1454 
1455         /* mouse button release on (some) 0xffdc devices */
1456         else if (ictx->kc == KEY_RESERVED && buf[0] == 0x68 && buf[1] == 0x82 &&
1457                  buf[2] == 0x81 && buf[3] == 0xb7)
1458                 ictx->kc = ictx->last_keycode;
1459 
1460         /* mouse button release on (some other) 0xffdc devices */
1461         else if (ictx->kc == KEY_RESERVED && buf[0] == 0x01 && buf[1] == 0x00 &&
1462                  buf[2] == 0x81 && buf[3] == 0xb7)
1463                 ictx->kc = ictx->last_keycode;
1464 
1465         /* mce-specific button handling, no keyup events */
1466         else if (ktype == IMON_KEY_MCE) {
1467                 ictx->rc_toggle = buf[2];
1468                 press_type = 1;
1469 
1470         /* incoherent or irrelevant data */
1471         } else if (ictx->kc == KEY_RESERVED)
1472                 press_type = -EINVAL;
1473 
1474         /* key release of 0xXXXXXXb7 key */
1475         else if (ictx->release_code)
1476                 press_type = 0;
1477 
1478         /* this is a button press */
1479         else
1480                 press_type = 1;
1481 
1482         spin_unlock_irqrestore(&ictx->kc_lock, flags);
1483 
1484         return press_type;
1485 }
1486 
1487 /**
1488  * Process the incoming packet
1489  */
1490 static void imon_incoming_packet(struct imon_context *ictx,
1491                                  struct urb *urb, int intf)
1492 {
1493         int len = urb->actual_length;
1494         unsigned char *buf = urb->transfer_buffer;
1495         struct device *dev = ictx->dev;
1496         unsigned long flags;
1497         u32 kc;
1498         int i;
1499         u64 scancode;
1500         int press_type = 0;
1501         int msec;
1502         struct timeval t;
1503         static struct timeval prev_time = { 0, 0 };
1504         u8 ktype;
1505 
1506         /* filter out junk data on the older 0xffdc imon devices */
1507         if ((buf[0] == 0xff) && (buf[1] == 0xff) && (buf[2] == 0xff))
1508                 return;
1509 
1510         /* Figure out what key was pressed */
1511         if (len == 8 && buf[7] == 0xee) {
1512                 scancode = be64_to_cpu(*((u64 *)buf));
1513                 ktype = IMON_KEY_PANEL;
1514                 kc = imon_panel_key_lookup(scancode);
1515         } else {
1516                 scancode = be32_to_cpu(*((u32 *)buf));
1517                 if (ictx->rc_type == RC_BIT_RC6_MCE) {
1518                         ktype = IMON_KEY_IMON;
1519                         if (buf[0] == 0x80)
1520                                 ktype = IMON_KEY_MCE;
1521                         kc = imon_mce_key_lookup(ictx, scancode);
1522                 } else {
1523                         ktype = IMON_KEY_IMON;
1524                         kc = imon_remote_key_lookup(ictx, scancode);
1525                 }
1526         }
1527 
1528         spin_lock_irqsave(&ictx->kc_lock, flags);
1529         /* keyboard/mouse mode toggle button */
1530         if (kc == KEY_KEYBOARD && !ictx->release_code) {
1531                 ictx->last_keycode = kc;
1532                 if (!nomouse) {
1533                         ictx->pad_mouse = ~(ictx->pad_mouse) & 0x1;
1534                         dev_dbg(dev, "toggling to %s mode\n",
1535                                 ictx->pad_mouse ? "mouse" : "keyboard");
1536                         spin_unlock_irqrestore(&ictx->kc_lock, flags);
1537                         return;
1538                 } else {
1539                         ictx->pad_mouse = false;
1540                         dev_dbg(dev, "mouse mode disabled, passing key value\n");
1541                 }
1542         }
1543 
1544         ictx->kc = kc;
1545         spin_unlock_irqrestore(&ictx->kc_lock, flags);
1546 
1547         /* send touchscreen events through input subsystem if touchpad data */
1548         if (ictx->display_type == IMON_DISPLAY_TYPE_VGA && len == 8 &&
1549             buf[7] == 0x86) {
1550                 imon_touch_event(ictx, buf);
1551                 return;
1552 
1553         /* look for mouse events with pad in mouse mode */
1554         } else if (ictx->pad_mouse) {
1555                 if (imon_mouse_event(ictx, buf, len))
1556                         return;
1557         }
1558 
1559         /* Now for some special handling to convert pad input to arrow keys */
1560         if (((len == 5) && (buf[0] == 0x01) && (buf[4] == 0x00)) ||
1561             ((len == 8) && (buf[0] & 0x40) &&
1562              !(buf[1] & 0x1 || buf[1] >> 2 & 0x1))) {
1563                 len = 8;
1564                 imon_pad_to_keys(ictx, buf);
1565         }
1566 
1567         if (debug) {
1568                 printk(KERN_INFO "intf%d decoded packet: ", intf);
1569                 for (i = 0; i < len; ++i)
1570                         printk("%02x ", buf[i]);
1571                 printk("\n");
1572         }
1573 
1574         press_type = imon_parse_press_type(ictx, buf, ktype);
1575         if (press_type < 0)
1576                 goto not_input_data;
1577 
1578         if (ktype != IMON_KEY_PANEL) {
1579                 if (press_type == 0)
1580                         rc_keyup(ictx->rdev);
1581                 else {
1582                         rc_keydown(ictx->rdev, ictx->rc_scancode, ictx->rc_toggle);
1583                         spin_lock_irqsave(&ictx->kc_lock, flags);
1584                         ictx->last_keycode = ictx->kc;
1585                         spin_unlock_irqrestore(&ictx->kc_lock, flags);
1586                 }
1587                 return;
1588         }
1589 
1590         /* Only panel type events left to process now */
1591         spin_lock_irqsave(&ictx->kc_lock, flags);
1592 
1593         do_gettimeofday(&t);
1594         /* KEY_MUTE repeats from knob need to be suppressed */
1595         if (ictx->kc == KEY_MUTE && ictx->kc == ictx->last_keycode) {
1596                 msec = tv2int(&t, &prev_time);
1597                 if (msec < ictx->idev->rep[REP_DELAY]) {
1598                         spin_unlock_irqrestore(&ictx->kc_lock, flags);
1599                         return;
1600                 }
1601         }
1602         prev_time = t;
1603         kc = ictx->kc;
1604 
1605         spin_unlock_irqrestore(&ictx->kc_lock, flags);
1606 
1607         input_report_key(ictx->idev, kc, press_type);
1608         input_sync(ictx->idev);
1609 
1610         /* panel keys don't generate a release */
1611         input_report_key(ictx->idev, kc, 0);
1612         input_sync(ictx->idev);
1613 
1614         spin_lock_irqsave(&ictx->kc_lock, flags);
1615         ictx->last_keycode = kc;
1616         spin_unlock_irqrestore(&ictx->kc_lock, flags);
1617 
1618         return;
1619 
1620 not_input_data:
1621         if (len != 8) {
1622                 dev_warn(dev, "imon %s: invalid incoming packet "
1623                          "size (len = %d, intf%d)\n", __func__, len, intf);
1624                 return;
1625         }
1626 
1627         /* iMON 2.4G associate frame */
1628         if (buf[0] == 0x00 &&
1629             buf[2] == 0xFF &&                           /* REFID */
1630             buf[3] == 0xFF &&
1631             buf[4] == 0xFF &&
1632             buf[5] == 0xFF &&                           /* iMON 2.4G */
1633            ((buf[6] == 0x4E && buf[7] == 0xDF) ||       /* LT */
1634             (buf[6] == 0x5E && buf[7] == 0xDF))) {      /* DT */
1635                 dev_warn(dev, "%s: remote associated refid=%02X\n",
1636                          __func__, buf[1]);
1637                 ictx->rf_isassociating = false;
1638         }
1639 }
1640 
1641 /**
1642  * Callback function for USB core API: receive data
1643  */
1644 static void usb_rx_callback_intf0(struct urb *urb)
1645 {
1646         struct imon_context *ictx;
1647         int intfnum = 0;
1648 
1649         if (!urb)
1650                 return;
1651 
1652         ictx = (struct imon_context *)urb->context;
1653         if (!ictx)
1654                 return;
1655 
1656         /*
1657          * if we get a callback before we're done configuring the hardware, we
1658          * can't yet process the data, as there's nowhere to send it, but we
1659          * still need to submit a new rx URB to avoid wedging the hardware
1660          */
1661         if (!ictx->dev_present_intf0)
1662                 goto out;
1663 
1664         switch (urb->status) {
1665         case -ENOENT:           /* usbcore unlink successful! */
1666                 return;
1667 
1668         case -ESHUTDOWN:        /* transport endpoint was shut down */
1669                 break;
1670 
1671         case 0:
1672                 imon_incoming_packet(ictx, urb, intfnum);
1673                 break;
1674 
1675         default:
1676                 dev_warn(ictx->dev, "imon %s: status(%d): ignored\n",
1677                          __func__, urb->status);
1678                 break;
1679         }
1680 
1681 out:
1682         usb_submit_urb(ictx->rx_urb_intf0, GFP_ATOMIC);
1683 }
1684 
1685 static void usb_rx_callback_intf1(struct urb *urb)
1686 {
1687         struct imon_context *ictx;
1688         int intfnum = 1;
1689 
1690         if (!urb)
1691                 return;
1692 
1693         ictx = (struct imon_context *)urb->context;
1694         if (!ictx)
1695                 return;
1696 
1697         /*
1698          * if we get a callback before we're done configuring the hardware, we
1699          * can't yet process the data, as there's nowhere to send it, but we
1700          * still need to submit a new rx URB to avoid wedging the hardware
1701          */
1702         if (!ictx->dev_present_intf1)
1703                 goto out;
1704 
1705         switch (urb->status) {
1706         case -ENOENT:           /* usbcore unlink successful! */
1707                 return;
1708 
1709         case -ESHUTDOWN:        /* transport endpoint was shut down */
1710                 break;
1711 
1712         case 0:
1713                 imon_incoming_packet(ictx, urb, intfnum);
1714                 break;
1715 
1716         default:
1717                 dev_warn(ictx->dev, "imon %s: status(%d): ignored\n",
1718                          __func__, urb->status);
1719                 break;
1720         }
1721 
1722 out:
1723         usb_submit_urb(ictx->rx_urb_intf1, GFP_ATOMIC);
1724 }
1725 
1726 /*
1727  * The 0x15c2:0xffdc device ID was used for umpteen different imon
1728  * devices, and all of them constantly spew interrupts, even when there
1729  * is no actual data to report. However, byte 6 of this buffer looks like
1730  * its unique across device variants, so we're trying to key off that to
1731  * figure out which display type (if any) and what IR protocol the device
1732  * actually supports. These devices have their IR protocol hard-coded into
1733  * their firmware, they can't be changed on the fly like the newer hardware.
1734  */
1735 static void imon_get_ffdc_type(struct imon_context *ictx)
1736 {
1737         u8 ffdc_cfg_byte = ictx->usb_rx_buf[6];
1738         u8 detected_display_type = IMON_DISPLAY_TYPE_NONE;
1739         u64 allowed_protos = RC_BIT_OTHER;
1740 
1741         switch (ffdc_cfg_byte) {
1742         /* iMON Knob, no display, iMON IR + vol knob */
1743         case 0x21:
1744                 dev_info(ictx->dev, "0xffdc iMON Knob, iMON IR");
1745                 ictx->display_supported = false;
1746                 break;
1747         /* iMON 2.4G LT (usb stick), no display, iMON RF */
1748         case 0x4e:
1749                 dev_info(ictx->dev, "0xffdc iMON 2.4G LT, iMON RF");
1750                 ictx->display_supported = false;
1751                 ictx->rf_device = true;
1752                 break;
1753         /* iMON VFD, no IR (does have vol knob tho) */
1754         case 0x35:
1755                 dev_info(ictx->dev, "0xffdc iMON VFD + knob, no IR");
1756                 detected_display_type = IMON_DISPLAY_TYPE_VFD;
1757                 break;
1758         /* iMON VFD, iMON IR */
1759         case 0x24:
1760         case 0x85:
1761                 dev_info(ictx->dev, "0xffdc iMON VFD, iMON IR");
1762                 detected_display_type = IMON_DISPLAY_TYPE_VFD;
1763                 break;
1764         /* iMON VFD, MCE IR */
1765         case 0x46:
1766         case 0x7e:
1767         case 0x9e:
1768                 dev_info(ictx->dev, "0xffdc iMON VFD, MCE IR");
1769                 detected_display_type = IMON_DISPLAY_TYPE_VFD;
1770                 allowed_protos = RC_BIT_RC6_MCE;
1771                 break;
1772         /* iMON LCD, MCE IR */
1773         case 0x9f:
1774                 dev_info(ictx->dev, "0xffdc iMON LCD, MCE IR");
1775                 detected_display_type = IMON_DISPLAY_TYPE_LCD;
1776                 allowed_protos = RC_BIT_RC6_MCE;
1777                 break;
1778         default:
1779                 dev_info(ictx->dev, "Unknown 0xffdc device, "
1780                          "defaulting to VFD and iMON IR");
1781                 detected_display_type = IMON_DISPLAY_TYPE_VFD;
1782                 /* We don't know which one it is, allow user to set the
1783                  * RC6 one from userspace if OTHER wasn't correct. */
1784                 allowed_protos |= RC_BIT_RC6_MCE;
1785                 break;
1786         }
1787 
1788         printk(KERN_CONT " (id 0x%02x)\n", ffdc_cfg_byte);
1789 
1790         ictx->display_type = detected_display_type;
1791         ictx->rc_type = allowed_protos;
1792 }
1793 
1794 static void imon_set_display_type(struct imon_context *ictx)
1795 {
1796         u8 configured_display_type = IMON_DISPLAY_TYPE_VFD;
1797 
1798         /*
1799          * Try to auto-detect the type of display if the user hasn't set
1800          * it by hand via the display_type modparam. Default is VFD.
1801          */
1802 
1803         if (display_type == IMON_DISPLAY_TYPE_AUTO) {
1804                 switch (ictx->product) {
1805                 case 0xffdc:
1806                         /* set in imon_get_ffdc_type() */
1807                         configured_display_type = ictx->display_type;
1808                         break;
1809                 case 0x0034:
1810                 case 0x0035:
1811                         configured_display_type = IMON_DISPLAY_TYPE_VGA;
1812                         break;
1813                 case 0x0038:
1814                 case 0x0039:
1815                 case 0x0045:
1816                         configured_display_type = IMON_DISPLAY_TYPE_LCD;
1817                         break;
1818                 case 0x003c:
1819                 case 0x0041:
1820                 case 0x0042:
1821                 case 0x0043:
1822                         configured_display_type = IMON_DISPLAY_TYPE_NONE;
1823                         ictx->display_supported = false;
1824                         break;
1825                 case 0x0036:
1826                 case 0x0044:
1827                 default:
1828                         configured_display_type = IMON_DISPLAY_TYPE_VFD;
1829                         break;
1830                 }
1831         } else {
1832                 configured_display_type = display_type;
1833                 if (display_type == IMON_DISPLAY_TYPE_NONE)
1834                         ictx->display_supported = false;
1835                 else
1836                         ictx->display_supported = true;
1837                 dev_info(ictx->dev, "%s: overriding display type to %d via "
1838                          "modparam\n", __func__, display_type);
1839         }
1840 
1841         ictx->display_type = configured_display_type;
1842 }
1843 
1844 static struct rc_dev *imon_init_rdev(struct imon_context *ictx)
1845 {
1846         struct rc_dev *rdev;
1847         int ret;
1848         const unsigned char fp_packet[] = { 0x40, 0x00, 0x00, 0x00,
1849                                             0x00, 0x00, 0x00, 0x88 };
1850 
1851         rdev = rc_allocate_device();
1852         if (!rdev) {
1853                 dev_err(ictx->dev, "remote control dev allocation failed\n");
1854                 goto out;
1855         }
1856 
1857         snprintf(ictx->name_rdev, sizeof(ictx->name_rdev),
1858                  "iMON Remote (%04x:%04x)", ictx->vendor, ictx->product);
1859         usb_make_path(ictx->usbdev_intf0, ictx->phys_rdev,
1860                       sizeof(ictx->phys_rdev));
1861         strlcat(ictx->phys_rdev, "/input0", sizeof(ictx->phys_rdev));
1862 
1863         rdev->input_name = ictx->name_rdev;
1864         rdev->input_phys = ictx->phys_rdev;
1865         usb_to_input_id(ictx->usbdev_intf0, &rdev->input_id);
1866         rdev->dev.parent = ictx->dev;
1867 
1868         rdev->priv = ictx;
1869         rdev->driver_type = RC_DRIVER_SCANCODE;
1870                                         /* iMON PAD or MCE */
1871         rc_set_allowed_protocols(rdev, RC_BIT_OTHER | RC_BIT_RC6_MCE);
1872         rdev->change_protocol = imon_ir_change_protocol;
1873         rdev->driver_name = MOD_NAME;
1874 
1875         /* Enable front-panel buttons and/or knobs */
1876         memcpy(ictx->usb_tx_buf, &fp_packet, sizeof(fp_packet));
1877         ret = send_packet(ictx);
1878         /* Not fatal, but warn about it */
1879         if (ret)
1880                 dev_info(ictx->dev, "panel buttons/knobs setup failed\n");
1881 
1882         if (ictx->product == 0xffdc) {
1883                 imon_get_ffdc_type(ictx);
1884                 rc_set_allowed_protocols(rdev, ictx->rc_type);
1885         }
1886 
1887         imon_set_display_type(ictx);
1888 
1889         if (ictx->rc_type == RC_BIT_RC6_MCE)
1890                 rdev->map_name = RC_MAP_IMON_MCE;
1891         else
1892                 rdev->map_name = RC_MAP_IMON_PAD;
1893 
1894         ret = rc_register_device(rdev);
1895         if (ret < 0) {
1896                 dev_err(ictx->dev, "remote input dev register failed\n");
1897                 goto out;
1898         }
1899 
1900         return rdev;
1901 
1902 out:
1903         rc_free_device(rdev);
1904         return NULL;
1905 }
1906 
1907 static struct input_dev *imon_init_idev(struct imon_context *ictx)
1908 {
1909         struct input_dev *idev;
1910         int ret, i;
1911 
1912         idev = input_allocate_device();
1913         if (!idev)
1914                 goto out;
1915 
1916         snprintf(ictx->name_idev, sizeof(ictx->name_idev),
1917                  "iMON Panel, Knob and Mouse(%04x:%04x)",
1918                  ictx->vendor, ictx->product);
1919         idev->name = ictx->name_idev;
1920 
1921         usb_make_path(ictx->usbdev_intf0, ictx->phys_idev,
1922                       sizeof(ictx->phys_idev));
1923         strlcat(ictx->phys_idev, "/input1", sizeof(ictx->phys_idev));
1924         idev->phys = ictx->phys_idev;
1925 
1926         idev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP) | BIT_MASK(EV_REL);
1927 
1928         idev->keybit[BIT_WORD(BTN_MOUSE)] =
1929                 BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_RIGHT);
1930         idev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y) |
1931                 BIT_MASK(REL_WHEEL);
1932 
1933         /* panel and/or knob code support */
1934         for (i = 0; i < ARRAY_SIZE(imon_panel_key_table); i++) {
1935                 u32 kc = imon_panel_key_table[i].keycode;
1936                 __set_bit(kc, idev->keybit);
1937         }
1938 
1939         usb_to_input_id(ictx->usbdev_intf0, &idev->id);
1940         idev->dev.parent = ictx->dev;
1941         input_set_drvdata(idev, ictx);
1942 
1943         ret = input_register_device(idev);
1944         if (ret < 0) {
1945                 dev_err(ictx->dev, "input dev register failed\n");
1946                 goto out;
1947         }
1948 
1949         return idev;
1950 
1951 out:
1952         input_free_device(idev);
1953         return NULL;
1954 }
1955 
1956 static struct input_dev *imon_init_touch(struct imon_context *ictx)
1957 {
1958         struct input_dev *touch;
1959         int ret;
1960 
1961         touch = input_allocate_device();
1962         if (!touch)
1963                 goto touch_alloc_failed;
1964 
1965         snprintf(ictx->name_touch, sizeof(ictx->name_touch),
1966                  "iMON USB Touchscreen (%04x:%04x)",
1967                  ictx->vendor, ictx->product);
1968         touch->name = ictx->name_touch;
1969 
1970         usb_make_path(ictx->usbdev_intf1, ictx->phys_touch,
1971                       sizeof(ictx->phys_touch));
1972         strlcat(ictx->phys_touch, "/input2", sizeof(ictx->phys_touch));
1973         touch->phys = ictx->phys_touch;
1974 
1975         touch->evbit[0] =
1976                 BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
1977         touch->keybit[BIT_WORD(BTN_TOUCH)] =
1978                 BIT_MASK(BTN_TOUCH);
1979         input_set_abs_params(touch, ABS_X,
1980                              0x00, 0xfff, 0, 0);
1981         input_set_abs_params(touch, ABS_Y,
1982                              0x00, 0xfff, 0, 0);
1983 
1984         input_set_drvdata(touch, ictx);
1985 
1986         usb_to_input_id(ictx->usbdev_intf1, &touch->id);
1987         touch->dev.parent = ictx->dev;
1988         ret = input_register_device(touch);
1989         if (ret <  0) {
1990                 dev_info(ictx->dev, "touchscreen input dev register failed\n");
1991                 goto touch_register_failed;
1992         }
1993 
1994         return touch;
1995 
1996 touch_register_failed:
1997         input_free_device(touch);
1998 
1999 touch_alloc_failed:
2000         return NULL;
2001 }
2002 
2003 static bool imon_find_endpoints(struct imon_context *ictx,
2004                                 struct usb_host_interface *iface_desc)
2005 {
2006         struct usb_endpoint_descriptor *ep;
2007         struct usb_endpoint_descriptor *rx_endpoint = NULL;
2008         struct usb_endpoint_descriptor *tx_endpoint = NULL;
2009         int ifnum = iface_desc->desc.bInterfaceNumber;
2010         int num_endpts = iface_desc->desc.bNumEndpoints;
2011         int i, ep_dir, ep_type;
2012         bool ir_ep_found = false;
2013         bool display_ep_found = false;
2014         bool tx_control = false;
2015 
2016         /*
2017          * Scan the endpoint list and set:
2018          *      first input endpoint = IR endpoint
2019          *      first output endpoint = display endpoint
2020          */
2021         for (i = 0; i < num_endpts && !(ir_ep_found && display_ep_found); ++i) {
2022                 ep = &iface_desc->endpoint[i].desc;
2023                 ep_dir = ep->bEndpointAddress & USB_ENDPOINT_DIR_MASK;
2024                 ep_type = ep->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
2025 
2026                 if (!ir_ep_found && ep_dir == USB_DIR_IN &&
2027                     ep_type == USB_ENDPOINT_XFER_INT) {
2028 
2029                         rx_endpoint = ep;
2030                         ir_ep_found = true;
2031                         dev_dbg(ictx->dev, "%s: found IR endpoint\n", __func__);
2032 
2033                 } else if (!display_ep_found && ep_dir == USB_DIR_OUT &&
2034                            ep_type == USB_ENDPOINT_XFER_INT) {
2035                         tx_endpoint = ep;
2036                         display_ep_found = true;
2037                         dev_dbg(ictx->dev, "%s: found display endpoint\n", __func__);
2038                 }
2039         }
2040 
2041         if (ifnum == 0) {
2042                 ictx->rx_endpoint_intf0 = rx_endpoint;
2043                 /*
2044                  * tx is used to send characters to lcd/vfd, associate RF
2045                  * remotes, set IR protocol, and maybe more...
2046                  */
2047                 ictx->tx_endpoint = tx_endpoint;
2048         } else {
2049                 ictx->rx_endpoint_intf1 = rx_endpoint;
2050         }
2051 
2052         /*
2053          * If we didn't find a display endpoint, this is probably one of the
2054          * newer iMON devices that use control urb instead of interrupt
2055          */
2056         if (!display_ep_found) {
2057                 tx_control = true;
2058                 display_ep_found = true;
2059                 dev_dbg(ictx->dev, "%s: device uses control endpoint, not "
2060                         "interface OUT endpoint\n", __func__);
2061         }
2062 
2063         /*
2064          * Some iMON receivers have no display. Unfortunately, it seems
2065          * that SoundGraph recycles device IDs between devices both with
2066          * and without... :\
2067          */
2068         if (ictx->display_type == IMON_DISPLAY_TYPE_NONE) {
2069                 display_ep_found = false;
2070                 dev_dbg(ictx->dev, "%s: device has no display\n", __func__);
2071         }
2072 
2073         /*
2074          * iMON Touch devices have a VGA touchscreen, but no "display", as
2075          * that refers to e.g. /dev/lcd0 (a character device LCD or VFD).
2076          */
2077         if (ictx->display_type == IMON_DISPLAY_TYPE_VGA) {
2078                 display_ep_found = false;
2079                 dev_dbg(ictx->dev, "%s: iMON Touch device found\n", __func__);
2080         }
2081 
2082         /* Input endpoint is mandatory */
2083         if (!ir_ep_found)
2084                 pr_err("no valid input (IR) endpoint found\n");
2085 
2086         ictx->tx_control = tx_control;
2087 
2088         if (display_ep_found)
2089                 ictx->display_supported = true;
2090 
2091         return ir_ep_found;
2092 
2093 }
2094 
2095 static struct imon_context *imon_init_intf0(struct usb_interface *intf,
2096                                             const struct usb_device_id *id)
2097 {
2098         struct imon_context *ictx;
2099         struct urb *rx_urb;
2100         struct urb *tx_urb;
2101         struct device *dev = &intf->dev;
2102         struct usb_host_interface *iface_desc;
2103         int ret = -ENOMEM;
2104 
2105         ictx = kzalloc(sizeof(struct imon_context), GFP_KERNEL);
2106         if (!ictx) {
2107                 dev_err(dev, "%s: kzalloc failed for context", __func__);
2108                 goto exit;
2109         }
2110         rx_urb = usb_alloc_urb(0, GFP_KERNEL);
2111         if (!rx_urb) {
2112                 dev_err(dev, "%s: usb_alloc_urb failed for IR urb", __func__);
2113                 goto rx_urb_alloc_failed;
2114         }
2115         tx_urb = usb_alloc_urb(0, GFP_KERNEL);
2116         if (!tx_urb) {
2117                 dev_err(dev, "%s: usb_alloc_urb failed for display urb",
2118                         __func__);
2119                 goto tx_urb_alloc_failed;
2120         }
2121 
2122         mutex_init(&ictx->lock);
2123         spin_lock_init(&ictx->kc_lock);
2124 
2125         mutex_lock(&ictx->lock);
2126 
2127         ictx->dev = dev;
2128         ictx->usbdev_intf0 = usb_get_dev(interface_to_usbdev(intf));
2129         ictx->rx_urb_intf0 = rx_urb;
2130         ictx->tx_urb = tx_urb;
2131         ictx->rf_device = false;
2132 
2133         ictx->vendor  = le16_to_cpu(ictx->usbdev_intf0->descriptor.idVendor);
2134         ictx->product = le16_to_cpu(ictx->usbdev_intf0->descriptor.idProduct);
2135 
2136         /* default send_packet delay is 5ms but some devices need more */
2137         ictx->send_packet_delay = id->driver_info & IMON_NEED_20MS_PKT_DELAY ?
2138                                   20 : 5;
2139 
2140         ret = -ENODEV;
2141         iface_desc = intf->cur_altsetting;
2142         if (!imon_find_endpoints(ictx, iface_desc)) {
2143                 goto find_endpoint_failed;
2144         }
2145 
2146         usb_fill_int_urb(ictx->rx_urb_intf0, ictx->usbdev_intf0,
2147                 usb_rcvintpipe(ictx->usbdev_intf0,
2148                         ictx->rx_endpoint_intf0->bEndpointAddress),
2149                 ictx->usb_rx_buf, sizeof(ictx->usb_rx_buf),
2150                 usb_rx_callback_intf0, ictx,
2151                 ictx->rx_endpoint_intf0->bInterval);
2152 
2153         ret = usb_submit_urb(ictx->rx_urb_intf0, GFP_KERNEL);
2154         if (ret) {
2155                 pr_err("usb_submit_urb failed for intf0 (%d)\n", ret);
2156                 goto urb_submit_failed;
2157         }
2158 
2159         ictx->idev = imon_init_idev(ictx);
2160         if (!ictx->idev) {
2161                 dev_err(dev, "%s: input device setup failed\n", __func__);
2162                 goto idev_setup_failed;
2163         }
2164 
2165         ictx->rdev = imon_init_rdev(ictx);
2166         if (!ictx->rdev) {
2167                 dev_err(dev, "%s: rc device setup failed\n", __func__);
2168                 goto rdev_setup_failed;
2169         }
2170 
2171         ictx->dev_present_intf0 = true;
2172 
2173         mutex_unlock(&ictx->lock);
2174         return ictx;
2175 
2176 rdev_setup_failed:
2177         input_unregister_device(ictx->idev);
2178 idev_setup_failed:
2179         usb_kill_urb(ictx->rx_urb_intf0);
2180 urb_submit_failed:
2181 find_endpoint_failed:
2182         mutex_unlock(&ictx->lock);
2183         usb_free_urb(tx_urb);
2184 tx_urb_alloc_failed:
2185         usb_free_urb(rx_urb);
2186 rx_urb_alloc_failed:
2187         kfree(ictx);
2188 exit:
2189         dev_err(dev, "unable to initialize intf0, err %d\n", ret);
2190 
2191         return NULL;
2192 }
2193 
2194 static struct imon_context *imon_init_intf1(struct usb_interface *intf,
2195                                             struct imon_context *ictx)
2196 {
2197         struct urb *rx_urb;
2198         struct usb_host_interface *iface_desc;
2199         int ret = -ENOMEM;
2200 
2201         rx_urb = usb_alloc_urb(0, GFP_KERNEL);
2202         if (!rx_urb) {
2203                 pr_err("usb_alloc_urb failed for IR urb\n");
2204                 goto rx_urb_alloc_failed;
2205         }
2206 
2207         mutex_lock(&ictx->lock);
2208 
2209         if (ictx->display_type == IMON_DISPLAY_TYPE_VGA) {
2210                 init_timer(&ictx->ttimer);
2211                 ictx->ttimer.data = (unsigned long)ictx;
2212                 ictx->ttimer.function = imon_touch_display_timeout;
2213         }
2214 
2215         ictx->usbdev_intf1 = usb_get_dev(interface_to_usbdev(intf));
2216         ictx->rx_urb_intf1 = rx_urb;
2217 
2218         ret = -ENODEV;
2219         iface_desc = intf->cur_altsetting;
2220         if (!imon_find_endpoints(ictx, iface_desc))
2221                 goto find_endpoint_failed;
2222 
2223         if (ictx->display_type == IMON_DISPLAY_TYPE_VGA) {
2224                 ictx->touch = imon_init_touch(ictx);
2225                 if (!ictx->touch)
2226                         goto touch_setup_failed;
2227         } else
2228                 ictx->touch = NULL;
2229 
2230         usb_fill_int_urb(ictx->rx_urb_intf1, ictx->usbdev_intf1,
2231                 usb_rcvintpipe(ictx->usbdev_intf1,
2232                         ictx->rx_endpoint_intf1->bEndpointAddress),
2233                 ictx->usb_rx_buf, sizeof(ictx->usb_rx_buf),
2234                 usb_rx_callback_intf1, ictx,
2235                 ictx->rx_endpoint_intf1->bInterval);
2236 
2237         ret = usb_submit_urb(ictx->rx_urb_intf1, GFP_KERNEL);
2238 
2239         if (ret) {
2240                 pr_err("usb_submit_urb failed for intf1 (%d)\n", ret);
2241                 goto urb_submit_failed;
2242         }
2243 
2244         ictx->dev_present_intf1 = true;
2245 
2246         mutex_unlock(&ictx->lock);
2247         return ictx;
2248 
2249 urb_submit_failed:
2250         if (ictx->touch)
2251                 input_unregister_device(ictx->touch);
2252 touch_setup_failed:
2253 find_endpoint_failed:
2254         mutex_unlock(&ictx->lock);
2255         usb_free_urb(rx_urb);
2256 rx_urb_alloc_failed:
2257         dev_err(ictx->dev, "unable to initialize intf1, err %d\n", ret);
2258 
2259         return NULL;
2260 }
2261 
2262 static void imon_init_display(struct imon_context *ictx,
2263                               struct usb_interface *intf)
2264 {
2265         int ret;
2266 
2267         dev_dbg(ictx->dev, "Registering iMON display with sysfs\n");
2268 
2269         /* set up sysfs entry for built-in clock */
2270         ret = sysfs_create_group(&intf->dev.kobj, &imon_display_attr_group);
2271         if (ret)
2272                 dev_err(ictx->dev, "Could not create display sysfs "
2273                         "entries(%d)", ret);
2274 
2275         if (ictx->display_type == IMON_DISPLAY_TYPE_LCD)
2276                 ret = usb_register_dev(intf, &imon_lcd_class);
2277         else
2278                 ret = usb_register_dev(intf, &imon_vfd_class);
2279         if (ret)
2280                 /* Not a fatal error, so ignore */
2281                 dev_info(ictx->dev, "could not get a minor number for "
2282                          "display\n");
2283 
2284 }
2285 
2286 /**
2287  * Callback function for USB core API: Probe
2288  */
2289 static int imon_probe(struct usb_interface *interface,
2290                       const struct usb_device_id *id)
2291 {
2292         struct usb_device *usbdev = NULL;
2293         struct usb_host_interface *iface_desc = NULL;
2294         struct usb_interface *first_if;
2295         struct device *dev = &interface->dev;
2296         int ifnum, sysfs_err;
2297         int ret = 0;
2298         struct imon_context *ictx = NULL;
2299         struct imon_context *first_if_ctx = NULL;
2300         u16 vendor, product;
2301 
2302         usbdev     = usb_get_dev(interface_to_usbdev(interface));
2303         iface_desc = interface->cur_altsetting;
2304         ifnum      = iface_desc->desc.bInterfaceNumber;
2305         vendor     = le16_to_cpu(usbdev->descriptor.idVendor);
2306         product    = le16_to_cpu(usbdev->descriptor.idProduct);
2307 
2308         dev_dbg(dev, "%s: found iMON device (%04x:%04x, intf%d)\n",
2309                 __func__, vendor, product, ifnum);
2310 
2311         /* prevent races probing devices w/multiple interfaces */
2312         mutex_lock(&driver_lock);
2313 
2314         first_if = usb_ifnum_to_if(usbdev, 0);
2315         first_if_ctx = usb_get_intfdata(first_if);
2316 
2317         if (ifnum == 0) {
2318                 ictx = imon_init_intf0(interface, id);
2319                 if (!ictx) {
2320                         pr_err("failed to initialize context!\n");
2321                         ret = -ENODEV;
2322                         goto fail;
2323                 }
2324 
2325         } else {
2326                 /* this is the secondary interface on the device */
2327 
2328                 /* fail early if first intf failed to register */
2329                 if (!first_if_ctx) {
2330                         ret = -ENODEV;
2331                         goto fail;
2332                 }
2333 
2334                 ictx = imon_init_intf1(interface, first_if_ctx);
2335                 if (!ictx) {
2336                         pr_err("failed to attach to context!\n");
2337                         ret = -ENODEV;
2338                         goto fail;
2339                 }
2340 
2341         }
2342 
2343         usb_set_intfdata(interface, ictx);
2344 
2345         if (ifnum == 0) {
2346                 mutex_lock(&ictx->lock);
2347 
2348                 if (product == 0xffdc && ictx->rf_device) {
2349                         sysfs_err = sysfs_create_group(&interface->dev.kobj,
2350                                                        &imon_rf_attr_group);
2351                         if (sysfs_err)
2352                                 pr_err("Could not create RF sysfs entries(%d)\n",
2353                                        sysfs_err);
2354                 }
2355 
2356                 if (ictx->display_supported)
2357                         imon_init_display(ictx, interface);
2358 
2359                 mutex_unlock(&ictx->lock);
2360         }
2361 
2362         dev_info(dev, "iMON device (%04x:%04x, intf%d) on "
2363                  "usb<%d:%d> initialized\n", vendor, product, ifnum,
2364                  usbdev->bus->busnum, usbdev->devnum);
2365 
2366         mutex_unlock(&driver_lock);
2367 
2368         return 0;
2369 
2370 fail:
2371         mutex_unlock(&driver_lock);
2372         dev_err(dev, "unable to register, err %d\n", ret);
2373 
2374         return ret;
2375 }
2376 
2377 /**
2378  * Callback function for USB core API: disconnect
2379  */
2380 static void imon_disconnect(struct usb_interface *interface)
2381 {
2382         struct imon_context *ictx;
2383         struct device *dev;
2384         int ifnum;
2385 
2386         /* prevent races with multi-interface device probing and display_open */
2387         mutex_lock(&driver_lock);
2388 
2389         ictx = usb_get_intfdata(interface);
2390         dev = ictx->dev;
2391         ifnum = interface->cur_altsetting->desc.bInterfaceNumber;
2392 
2393         /*
2394          * sysfs_remove_group is safe to call even if sysfs_create_group
2395          * hasn't been called
2396          */
2397         sysfs_remove_group(&interface->dev.kobj, &imon_display_attr_group);
2398         sysfs_remove_group(&interface->dev.kobj, &imon_rf_attr_group);
2399 
2400         usb_set_intfdata(interface, NULL);
2401 
2402         /* Abort ongoing write */
2403         if (ictx->tx.busy) {
2404                 usb_kill_urb(ictx->tx_urb);
2405                 complete_all(&ictx->tx.finished);
2406         }
2407 
2408         if (ifnum == 0) {
2409                 ictx->dev_present_intf0 = false;
2410                 usb_kill_urb(ictx->rx_urb_intf0);
2411                 input_unregister_device(ictx->idev);
2412                 rc_unregister_device(ictx->rdev);
2413                 if (ictx->display_supported) {
2414                         if (ictx->display_type == IMON_DISPLAY_TYPE_LCD)
2415                                 usb_deregister_dev(interface, &imon_lcd_class);
2416                         else if (ictx->display_type == IMON_DISPLAY_TYPE_VFD)
2417                                 usb_deregister_dev(interface, &imon_vfd_class);
2418                 }
2419         } else {
2420                 ictx->dev_present_intf1 = false;
2421                 usb_kill_urb(ictx->rx_urb_intf1);
2422                 if (ictx->display_type == IMON_DISPLAY_TYPE_VGA) {
2423                         input_unregister_device(ictx->touch);
2424                         del_timer_sync(&ictx->ttimer);
2425                 }
2426         }
2427 
2428         if (!ictx->dev_present_intf0 && !ictx->dev_present_intf1)
2429                 free_imon_context(ictx);
2430 
2431         mutex_unlock(&driver_lock);
2432 
2433         dev_dbg(dev, "%s: iMON device (intf%d) disconnected\n",
2434                 __func__, ifnum);
2435 }
2436 
2437 static int imon_suspend(struct usb_interface *intf, pm_message_t message)
2438 {
2439         struct imon_context *ictx = usb_get_intfdata(intf);
2440         int ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
2441 
2442         if (ifnum == 0)
2443                 usb_kill_urb(ictx->rx_urb_intf0);
2444         else
2445                 usb_kill_urb(ictx->rx_urb_intf1);
2446 
2447         return 0;
2448 }
2449 
2450 static int imon_resume(struct usb_interface *intf)
2451 {
2452         int rc = 0;
2453         struct imon_context *ictx = usb_get_intfdata(intf);
2454         int ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
2455 
2456         if (ifnum == 0) {
2457                 usb_fill_int_urb(ictx->rx_urb_intf0, ictx->usbdev_intf0,
2458                         usb_rcvintpipe(ictx->usbdev_intf0,
2459                                 ictx->rx_endpoint_intf0->bEndpointAddress),
2460                         ictx->usb_rx_buf, sizeof(ictx->usb_rx_buf),
2461                         usb_rx_callback_intf0, ictx,
2462                         ictx->rx_endpoint_intf0->bInterval);
2463 
2464                 rc = usb_submit_urb(ictx->rx_urb_intf0, GFP_ATOMIC);
2465 
2466         } else {
2467                 usb_fill_int_urb(ictx->rx_urb_intf1, ictx->usbdev_intf1,
2468                         usb_rcvintpipe(ictx->usbdev_intf1,
2469                                 ictx->rx_endpoint_intf1->bEndpointAddress),
2470                         ictx->usb_rx_buf, sizeof(ictx->usb_rx_buf),
2471                         usb_rx_callback_intf1, ictx,
2472                         ictx->rx_endpoint_intf1->bInterval);
2473 
2474                 rc = usb_submit_urb(ictx->rx_urb_intf1, GFP_ATOMIC);
2475         }
2476 
2477         return rc;
2478 }
2479 
2480 module_usb_driver(imon_driver);
2481 

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