Version:  2.0.40 2.2.26 2.4.37 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10

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 __user *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 __user *buf,
 86                          size_t n_bytes, loff_t *pos);
 87 
 88 /*** G L O B A L S ***/
 89 
 90 struct imon_panel_key_table {
 91         u64 hw_code;
 92         u32 keycode;
 93 };
 94 
 95 struct imon_usb_dev_descr {
 96         __u16 flags;
 97 #define IMON_NO_FLAGS 0
 98 #define IMON_NEED_20MS_PKT_DELAY 1
 99         struct imon_panel_key_table key_table[];
100 };
101 
102 struct imon_context {
103         struct device *dev;
104         /* Newer devices have two interfaces */
105         struct usb_device *usbdev_intf0;
106         struct usb_device *usbdev_intf1;
107 
108         bool display_supported;         /* not all controllers do */
109         bool display_isopen;            /* display port has been opened */
110         bool rf_device;                 /* true if iMON 2.4G LT/DT RF device */
111         bool rf_isassociating;          /* RF remote associating */
112         bool dev_present_intf0;         /* USB device presence, interface 0 */
113         bool dev_present_intf1;         /* USB device presence, interface 1 */
114 
115         struct mutex lock;              /* to lock this object */
116         wait_queue_head_t remove_ok;    /* For unexpected USB disconnects */
117 
118         struct usb_endpoint_descriptor *rx_endpoint_intf0;
119         struct usb_endpoint_descriptor *rx_endpoint_intf1;
120         struct usb_endpoint_descriptor *tx_endpoint;
121         struct urb *rx_urb_intf0;
122         struct urb *rx_urb_intf1;
123         struct urb *tx_urb;
124         bool tx_control;
125         unsigned char usb_rx_buf[8];
126         unsigned char usb_tx_buf[8];
127         unsigned int send_packet_delay;
128 
129         struct tx_t {
130                 unsigned char data_buf[35];     /* user data buffer */
131                 struct completion finished;     /* wait for write to finish */
132                 bool busy;                      /* write in progress */
133                 int status;                     /* status of tx completion */
134         } tx;
135 
136         u16 vendor;                     /* usb vendor ID */
137         u16 product;                    /* usb product ID */
138 
139         struct rc_dev *rdev;            /* rc-core device for remote */
140         struct input_dev *idev;         /* input device for panel & IR mouse */
141         struct input_dev *touch;        /* input device for touchscreen */
142 
143         spinlock_t kc_lock;             /* make sure we get keycodes right */
144         u32 kc;                         /* current input keycode */
145         u32 last_keycode;               /* last reported input keycode */
146         u32 rc_scancode;                /* the computed remote scancode */
147         u8 rc_toggle;                   /* the computed remote toggle bit */
148         u64 rc_type;                    /* iMON or MCE (RC6) IR protocol? */
149         bool release_code;              /* some keys send a release code */
150 
151         u8 display_type;                /* store the display type */
152         bool pad_mouse;                 /* toggle kbd(0)/mouse(1) mode */
153 
154         char name_rdev[128];            /* rc input device name */
155         char phys_rdev[64];             /* rc input device phys path */
156 
157         char name_idev[128];            /* input device name */
158         char phys_idev[64];             /* input device phys path */
159 
160         char name_touch[128];           /* touch screen name */
161         char phys_touch[64];            /* touch screen phys path */
162         struct timer_list ttimer;       /* touch screen timer */
163         int touch_x;                    /* x coordinate on touchscreen */
164         int touch_y;                    /* y coordinate on touchscreen */
165         struct imon_usb_dev_descr *dev_descr; /* device description with key
166                                                  table for front panels */
167 };
168 
169 #define TOUCH_TIMEOUT   (HZ/30)
170 
171 /* vfd character device file operations */
172 static const struct file_operations vfd_fops = {
173         .owner          = THIS_MODULE,
174         .open           = &display_open,
175         .write          = &vfd_write,
176         .release        = &display_close,
177         .llseek         = noop_llseek,
178 };
179 
180 /* lcd character device file operations */
181 static const struct file_operations lcd_fops = {
182         .owner          = THIS_MODULE,
183         .open           = &display_open,
184         .write          = &lcd_write,
185         .release        = &display_close,
186         .llseek         = noop_llseek,
187 };
188 
189 enum {
190         IMON_DISPLAY_TYPE_AUTO = 0,
191         IMON_DISPLAY_TYPE_VFD  = 1,
192         IMON_DISPLAY_TYPE_LCD  = 2,
193         IMON_DISPLAY_TYPE_VGA  = 3,
194         IMON_DISPLAY_TYPE_NONE = 4,
195 };
196 
197 enum {
198         IMON_KEY_IMON   = 0,
199         IMON_KEY_MCE    = 1,
200         IMON_KEY_PANEL  = 2,
201 };
202 
203 static struct usb_class_driver imon_vfd_class = {
204         .name           = DEVICE_NAME,
205         .fops           = &vfd_fops,
206         .minor_base     = DISPLAY_MINOR_BASE,
207 };
208 
209 static struct usb_class_driver imon_lcd_class = {
210         .name           = DEVICE_NAME,
211         .fops           = &lcd_fops,
212         .minor_base     = DISPLAY_MINOR_BASE,
213 };
214 
215 /* imon receiver front panel/knob key table */
216 static const struct imon_usb_dev_descr imon_default_table = {
217         .flags = IMON_NO_FLAGS,
218         .key_table = {
219                 { 0x000000000f00ffeell, KEY_MEDIA }, /* Go */
220                 { 0x000000001200ffeell, KEY_UP },
221                 { 0x000000001300ffeell, KEY_DOWN },
222                 { 0x000000001400ffeell, KEY_LEFT },
223                 { 0x000000001500ffeell, KEY_RIGHT },
224                 { 0x000000001600ffeell, KEY_ENTER },
225                 { 0x000000001700ffeell, KEY_ESC },
226                 { 0x000000001f00ffeell, KEY_AUDIO },
227                 { 0x000000002000ffeell, KEY_VIDEO },
228                 { 0x000000002100ffeell, KEY_CAMERA },
229                 { 0x000000002700ffeell, KEY_DVD },
230                 { 0x000000002300ffeell, KEY_TV },
231                 { 0x000000002b00ffeell, KEY_EXIT },
232                 { 0x000000002c00ffeell, KEY_SELECT },
233                 { 0x000000002d00ffeell, KEY_MENU },
234                 { 0x000000000500ffeell, KEY_PREVIOUS },
235                 { 0x000000000700ffeell, KEY_REWIND },
236                 { 0x000000000400ffeell, KEY_STOP },
237                 { 0x000000003c00ffeell, KEY_PLAYPAUSE },
238                 { 0x000000000800ffeell, KEY_FASTFORWARD },
239                 { 0x000000000600ffeell, KEY_NEXT },
240                 { 0x000000010000ffeell, KEY_RIGHT },
241                 { 0x000001000000ffeell, KEY_LEFT },
242                 { 0x000000003d00ffeell, KEY_SELECT },
243                 { 0x000100000000ffeell, KEY_VOLUMEUP },
244                 { 0x010000000000ffeell, KEY_VOLUMEDOWN },
245                 { 0x000000000100ffeell, KEY_MUTE },
246                 /* 0xffdc iMON MCE VFD */
247                 { 0x00010000ffffffeell, KEY_VOLUMEUP },
248                 { 0x01000000ffffffeell, KEY_VOLUMEDOWN },
249                 { 0x00000001ffffffeell, KEY_MUTE },
250                 { 0x0000000fffffffeell, KEY_MEDIA },
251                 { 0x00000012ffffffeell, KEY_UP },
252                 { 0x00000013ffffffeell, KEY_DOWN },
253                 { 0x00000014ffffffeell, KEY_LEFT },
254                 { 0x00000015ffffffeell, KEY_RIGHT },
255                 { 0x00000016ffffffeell, KEY_ENTER },
256                 { 0x00000017ffffffeell, KEY_ESC },
257                 /* iMON Knob values */
258                 { 0x000100ffffffffeell, KEY_VOLUMEUP },
259                 { 0x010000ffffffffeell, KEY_VOLUMEDOWN },
260                 { 0x000008ffffffffeell, KEY_MUTE },
261                 { 0, KEY_RESERVED },
262         }
263 };
264 
265 static const struct imon_usb_dev_descr imon_OEM_VFD = {
266         .flags = IMON_NEED_20MS_PKT_DELAY,
267         .key_table = {
268                 { 0x000000000f00ffeell, KEY_MEDIA }, /* Go */
269                 { 0x000000001200ffeell, KEY_UP },
270                 { 0x000000001300ffeell, KEY_DOWN },
271                 { 0x000000001400ffeell, KEY_LEFT },
272                 { 0x000000001500ffeell, KEY_RIGHT },
273                 { 0x000000001600ffeell, KEY_ENTER },
274                 { 0x000000001700ffeell, KEY_ESC },
275                 { 0x000000001f00ffeell, KEY_AUDIO },
276                 { 0x000000002b00ffeell, KEY_EXIT },
277                 { 0x000000002c00ffeell, KEY_SELECT },
278                 { 0x000000002d00ffeell, KEY_MENU },
279                 { 0x000000000500ffeell, KEY_PREVIOUS },
280                 { 0x000000000700ffeell, KEY_REWIND },
281                 { 0x000000000400ffeell, KEY_STOP },
282                 { 0x000000003c00ffeell, KEY_PLAYPAUSE },
283                 { 0x000000000800ffeell, KEY_FASTFORWARD },
284                 { 0x000000000600ffeell, KEY_NEXT },
285                 { 0x000000010000ffeell, KEY_RIGHT },
286                 { 0x000001000000ffeell, KEY_LEFT },
287                 { 0x000000003d00ffeell, KEY_SELECT },
288                 { 0x000100000000ffeell, KEY_VOLUMEUP },
289                 { 0x010000000000ffeell, KEY_VOLUMEDOWN },
290                 { 0x000000000100ffeell, KEY_MUTE },
291                 /* 0xffdc iMON MCE VFD */
292                 { 0x00010000ffffffeell, KEY_VOLUMEUP },
293                 { 0x01000000ffffffeell, KEY_VOLUMEDOWN },
294                 { 0x00000001ffffffeell, KEY_MUTE },
295                 { 0x0000000fffffffeell, KEY_MEDIA },
296                 { 0x00000012ffffffeell, KEY_UP },
297                 { 0x00000013ffffffeell, KEY_DOWN },
298                 { 0x00000014ffffffeell, KEY_LEFT },
299                 { 0x00000015ffffffeell, KEY_RIGHT },
300                 { 0x00000016ffffffeell, KEY_ENTER },
301                 { 0x00000017ffffffeell, KEY_ESC },
302                 /* iMON Knob values */
303                 { 0x000100ffffffffeell, KEY_VOLUMEUP },
304                 { 0x010000ffffffffeell, KEY_VOLUMEDOWN },
305                 { 0x000008ffffffffeell, KEY_MUTE },
306                 { 0, KEY_RESERVED },
307         }
308 };
309 
310 /* imon receiver front panel/knob key table for DH102*/
311 static const struct imon_usb_dev_descr imon_DH102 = {
312         .flags = IMON_NO_FLAGS,
313         .key_table = {
314                 { 0x000100000000ffeell, KEY_VOLUMEUP },
315                 { 0x010000000000ffeell, KEY_VOLUMEDOWN },
316                 { 0x000000010000ffeell, KEY_MUTE },
317                 { 0x0000000f0000ffeell, KEY_MEDIA },
318                 { 0x000000120000ffeell, KEY_UP },
319                 { 0x000000130000ffeell, KEY_DOWN },
320                 { 0x000000140000ffeell, KEY_LEFT },
321                 { 0x000000150000ffeell, KEY_RIGHT },
322                 { 0x000000160000ffeell, KEY_ENTER },
323                 { 0x000000170000ffeell, KEY_ESC },
324                 { 0x0000002b0000ffeell, KEY_EXIT },
325                 { 0x0000002c0000ffeell, KEY_SELECT },
326                 { 0x0000002d0000ffeell, KEY_MENU },
327                 { 0, KEY_RESERVED }
328         }
329 };
330 
331 /*
332  * USB Device ID for iMON USB Control Boards
333  *
334  * The Windows drivers contain 6 different inf files, more or less one for
335  * each new device until the 0x0034-0x0046 devices, which all use the same
336  * driver. Some of the devices in the 34-46 range haven't been definitively
337  * identified yet. Early devices have either a TriGem Computer, Inc. or a
338  * Samsung vendor ID (0x0aa8 and 0x04e8 respectively), while all later
339  * devices use the SoundGraph vendor ID (0x15c2). This driver only supports
340  * the ffdc and later devices, which do onboard decoding.
341  */
342 static struct usb_device_id imon_usb_id_table[] = {
343         /*
344          * Several devices with this same device ID, all use iMON_PAD.inf
345          * SoundGraph iMON PAD (IR & VFD)
346          * SoundGraph iMON PAD (IR & LCD)
347          * SoundGraph iMON Knob (IR only)
348          */
349         { USB_DEVICE(0x15c2, 0xffdc),
350           .driver_info = (unsigned long)&imon_default_table },
351 
352         /*
353          * Newer devices, all driven by the latest iMON Windows driver, full
354          * list of device IDs extracted via 'strings Setup/data1.hdr |grep 15c2'
355          * Need user input to fill in details on unknown devices.
356          */
357         /* SoundGraph iMON OEM Touch LCD (IR & 7" VGA LCD) */
358         { USB_DEVICE(0x15c2, 0x0034),
359           .driver_info = (unsigned long)&imon_DH102 },
360         /* SoundGraph iMON OEM Touch LCD (IR & 4.3" VGA LCD) */
361         { USB_DEVICE(0x15c2, 0x0035),
362           .driver_info = (unsigned long)&imon_default_table},
363         /* SoundGraph iMON OEM VFD (IR & VFD) */
364         { USB_DEVICE(0x15c2, 0x0036),
365           .driver_info = (unsigned long)&imon_OEM_VFD },
366         /* device specifics unknown */
367         { USB_DEVICE(0x15c2, 0x0037),
368           .driver_info = (unsigned long)&imon_default_table},
369         /* SoundGraph iMON OEM LCD (IR & LCD) */
370         { USB_DEVICE(0x15c2, 0x0038),
371           .driver_info = (unsigned long)&imon_default_table},
372         /* SoundGraph iMON UltraBay (IR & LCD) */
373         { USB_DEVICE(0x15c2, 0x0039),
374           .driver_info = (unsigned long)&imon_default_table},
375         /* device specifics unknown */
376         { USB_DEVICE(0x15c2, 0x003a),
377           .driver_info = (unsigned long)&imon_default_table},
378         /* device specifics unknown */
379         { USB_DEVICE(0x15c2, 0x003b),
380           .driver_info = (unsigned long)&imon_default_table},
381         /* SoundGraph iMON OEM Inside (IR only) */
382         { USB_DEVICE(0x15c2, 0x003c),
383           .driver_info = (unsigned long)&imon_default_table},
384         /* device specifics unknown */
385         { USB_DEVICE(0x15c2, 0x003d),
386           .driver_info = (unsigned long)&imon_default_table},
387         /* device specifics unknown */
388         { USB_DEVICE(0x15c2, 0x003e),
389           .driver_info = (unsigned long)&imon_default_table},
390         /* device specifics unknown */
391         { USB_DEVICE(0x15c2, 0x003f),
392           .driver_info = (unsigned long)&imon_default_table},
393         /* device specifics unknown */
394         { USB_DEVICE(0x15c2, 0x0040),
395           .driver_info = (unsigned long)&imon_default_table},
396         /* SoundGraph iMON MINI (IR only) */
397         { USB_DEVICE(0x15c2, 0x0041),
398           .driver_info = (unsigned long)&imon_default_table},
399         /* Antec Veris Multimedia Station EZ External (IR only) */
400         { USB_DEVICE(0x15c2, 0x0042),
401           .driver_info = (unsigned long)&imon_default_table},
402         /* Antec Veris Multimedia Station Basic Internal (IR only) */
403         { USB_DEVICE(0x15c2, 0x0043),
404           .driver_info = (unsigned long)&imon_default_table},
405         /* Antec Veris Multimedia Station Elite (IR & VFD) */
406         { USB_DEVICE(0x15c2, 0x0044),
407           .driver_info = (unsigned long)&imon_default_table},
408         /* Antec Veris Multimedia Station Premiere (IR & LCD) */
409         { USB_DEVICE(0x15c2, 0x0045),
410           .driver_info = (unsigned long)&imon_default_table},
411         /* device specifics unknown */
412         { USB_DEVICE(0x15c2, 0x0046),
413           .driver_info = (unsigned long)&imon_default_table},
414         {}
415 };
416 
417 /* USB Device data */
418 static struct usb_driver imon_driver = {
419         .name           = MOD_NAME,
420         .probe          = imon_probe,
421         .disconnect     = imon_disconnect,
422         .suspend        = imon_suspend,
423         .resume         = imon_resume,
424         .id_table       = imon_usb_id_table,
425 };
426 
427 /* to prevent races between open() and disconnect(), probing, etc */
428 static DEFINE_MUTEX(driver_lock);
429 
430 /* Module bookkeeping bits */
431 MODULE_AUTHOR(MOD_AUTHOR);
432 MODULE_DESCRIPTION(MOD_DESC);
433 MODULE_VERSION(MOD_VERSION);
434 MODULE_LICENSE("GPL");
435 MODULE_DEVICE_TABLE(usb, imon_usb_id_table);
436 
437 static bool debug;
438 module_param(debug, bool, S_IRUGO | S_IWUSR);
439 MODULE_PARM_DESC(debug, "Debug messages: 0=no, 1=yes (default: no)");
440 
441 /* lcd, vfd, vga or none? should be auto-detected, but can be overridden... */
442 static int display_type;
443 module_param(display_type, int, S_IRUGO);
444 MODULE_PARM_DESC(display_type, "Type of attached display. 0=autodetect, 1=vfd, 2=lcd, 3=vga, 4=none (default: autodetect)");
445 
446 static int pad_stabilize = 1;
447 module_param(pad_stabilize, int, S_IRUGO | S_IWUSR);
448 MODULE_PARM_DESC(pad_stabilize, "Apply stabilization algorithm to iMON PAD presses in arrow key mode. 0=disable, 1=enable (default).");
449 
450 /*
451  * In certain use cases, mouse mode isn't really helpful, and could actually
452  * cause confusion, so allow disabling it when the IR device is open.
453  */
454 static bool nomouse;
455 module_param(nomouse, bool, S_IRUGO | S_IWUSR);
456 MODULE_PARM_DESC(nomouse, "Disable mouse input device mode when IR device is open. 0=don't disable, 1=disable. (default: don't disable)");
457 
458 /* threshold at which a pad push registers as an arrow key in kbd mode */
459 static int pad_thresh;
460 module_param(pad_thresh, int, S_IRUGO | S_IWUSR);
461 MODULE_PARM_DESC(pad_thresh, "Threshold at which a pad push registers as an arrow key in kbd mode (default: 28)");
462 
463 
464 static void free_imon_context(struct imon_context *ictx)
465 {
466         struct device *dev = ictx->dev;
467 
468         usb_free_urb(ictx->tx_urb);
469         usb_free_urb(ictx->rx_urb_intf0);
470         usb_free_urb(ictx->rx_urb_intf1);
471         kfree(ictx);
472 
473         dev_dbg(dev, "%s: iMON context freed\n", __func__);
474 }
475 
476 /**
477  * Called when the Display device (e.g. /dev/lcd0)
478  * is opened by the application.
479  */
480 static int display_open(struct inode *inode, struct file *file)
481 {
482         struct usb_interface *interface;
483         struct imon_context *ictx = NULL;
484         int subminor;
485         int retval = 0;
486 
487         /* prevent races with disconnect */
488         mutex_lock(&driver_lock);
489 
490         subminor = iminor(inode);
491         interface = usb_find_interface(&imon_driver, subminor);
492         if (!interface) {
493                 pr_err("could not find interface for minor %d\n", subminor);
494                 retval = -ENODEV;
495                 goto exit;
496         }
497         ictx = usb_get_intfdata(interface);
498 
499         if (!ictx) {
500                 pr_err("no context found for minor %d\n", subminor);
501                 retval = -ENODEV;
502                 goto exit;
503         }
504 
505         mutex_lock(&ictx->lock);
506 
507         if (!ictx->display_supported) {
508                 pr_err("display not supported by device\n");
509                 retval = -ENODEV;
510         } else if (ictx->display_isopen) {
511                 pr_err("display port is already open\n");
512                 retval = -EBUSY;
513         } else {
514                 ictx->display_isopen = true;
515                 file->private_data = ictx;
516                 dev_dbg(ictx->dev, "display port opened\n");
517         }
518 
519         mutex_unlock(&ictx->lock);
520 
521 exit:
522         mutex_unlock(&driver_lock);
523         return retval;
524 }
525 
526 /**
527  * Called when the display device (e.g. /dev/lcd0)
528  * is closed by the application.
529  */
530 static int display_close(struct inode *inode, struct file *file)
531 {
532         struct imon_context *ictx = NULL;
533         int retval = 0;
534 
535         ictx = file->private_data;
536 
537         if (!ictx) {
538                 pr_err("no context for device\n");
539                 return -ENODEV;
540         }
541 
542         mutex_lock(&ictx->lock);
543 
544         if (!ictx->display_supported) {
545                 pr_err("display not supported by device\n");
546                 retval = -ENODEV;
547         } else if (!ictx->display_isopen) {
548                 pr_err("display is not open\n");
549                 retval = -EIO;
550         } else {
551                 ictx->display_isopen = false;
552                 dev_dbg(ictx->dev, "display port closed\n");
553         }
554 
555         mutex_unlock(&ictx->lock);
556         return retval;
557 }
558 
559 /**
560  * Sends a packet to the device -- this function must be called with
561  * ictx->lock held, or its unlock/lock sequence while waiting for tx
562  * to complete can/will lead to a deadlock.
563  */
564 static int send_packet(struct imon_context *ictx)
565 {
566         unsigned int pipe;
567         unsigned long timeout;
568         int interval = 0;
569         int retval = 0;
570         struct usb_ctrlrequest *control_req = NULL;
571 
572         /* Check if we need to use control or interrupt urb */
573         if (!ictx->tx_control) {
574                 pipe = usb_sndintpipe(ictx->usbdev_intf0,
575                                       ictx->tx_endpoint->bEndpointAddress);
576                 interval = ictx->tx_endpoint->bInterval;
577 
578                 usb_fill_int_urb(ictx->tx_urb, ictx->usbdev_intf0, pipe,
579                                  ictx->usb_tx_buf,
580                                  sizeof(ictx->usb_tx_buf),
581                                  usb_tx_callback, ictx, interval);
582 
583                 ictx->tx_urb->actual_length = 0;
584         } else {
585                 /* fill request into kmalloc'ed space: */
586                 control_req = kmalloc(sizeof(struct usb_ctrlrequest),
587                                       GFP_KERNEL);
588                 if (control_req == NULL)
589                         return -ENOMEM;
590 
591                 /* setup packet is '21 09 0200 0001 0008' */
592                 control_req->bRequestType = 0x21;
593                 control_req->bRequest = 0x09;
594                 control_req->wValue = cpu_to_le16(0x0200);
595                 control_req->wIndex = cpu_to_le16(0x0001);
596                 control_req->wLength = cpu_to_le16(0x0008);
597 
598                 /* control pipe is endpoint 0x00 */
599                 pipe = usb_sndctrlpipe(ictx->usbdev_intf0, 0);
600 
601                 /* build the control urb */
602                 usb_fill_control_urb(ictx->tx_urb, ictx->usbdev_intf0,
603                                      pipe, (unsigned char *)control_req,
604                                      ictx->usb_tx_buf,
605                                      sizeof(ictx->usb_tx_buf),
606                                      usb_tx_callback, ictx);
607                 ictx->tx_urb->actual_length = 0;
608         }
609 
610         reinit_completion(&ictx->tx.finished);
611         ictx->tx.busy = true;
612         smp_rmb(); /* ensure later readers know we're busy */
613 
614         retval = usb_submit_urb(ictx->tx_urb, GFP_KERNEL);
615         if (retval) {
616                 ictx->tx.busy = false;
617                 smp_rmb(); /* ensure later readers know we're not busy */
618                 pr_err_ratelimited("error submitting urb(%d)\n", retval);
619         } else {
620                 /* Wait for transmission to complete (or abort) */
621                 mutex_unlock(&ictx->lock);
622                 retval = wait_for_completion_interruptible(
623                                 &ictx->tx.finished);
624                 if (retval) {
625                         usb_kill_urb(ictx->tx_urb);
626                         pr_err_ratelimited("task interrupted\n");
627                 }
628                 mutex_lock(&ictx->lock);
629 
630                 retval = ictx->tx.status;
631                 if (retval)
632                         pr_err_ratelimited("packet tx failed (%d)\n", retval);
633         }
634 
635         kfree(control_req);
636 
637         /*
638          * Induce a mandatory delay before returning, as otherwise,
639          * send_packet can get called so rapidly as to overwhelm the device,
640          * particularly on faster systems and/or those with quirky usb.
641          */
642         timeout = msecs_to_jiffies(ictx->send_packet_delay);
643         set_current_state(TASK_INTERRUPTIBLE);
644         schedule_timeout(timeout);
645 
646         return retval;
647 }
648 
649 /**
650  * Sends an associate packet to the iMON 2.4G.
651  *
652  * This might not be such a good idea, since it has an id collision with
653  * some versions of the "IR & VFD" combo. The only way to determine if it
654  * is an RF version is to look at the product description string. (Which
655  * we currently do not fetch).
656  */
657 static int send_associate_24g(struct imon_context *ictx)
658 {
659         int retval;
660         const unsigned char packet[8] = { 0x01, 0x00, 0x00, 0x00,
661                                           0x00, 0x00, 0x00, 0x20 };
662 
663         if (!ictx) {
664                 pr_err("no context for device\n");
665                 return -ENODEV;
666         }
667 
668         if (!ictx->dev_present_intf0) {
669                 pr_err("no iMON device present\n");
670                 return -ENODEV;
671         }
672 
673         memcpy(ictx->usb_tx_buf, packet, sizeof(packet));
674         retval = send_packet(ictx);
675 
676         return retval;
677 }
678 
679 /**
680  * Sends packets to setup and show clock on iMON display
681  *
682  * Arguments: year - last 2 digits of year, month - 1..12,
683  * day - 1..31, dow - day of the week (0-Sun...6-Sat),
684  * hour - 0..23, minute - 0..59, second - 0..59
685  */
686 static int send_set_imon_clock(struct imon_context *ictx,
687                                unsigned int year, unsigned int month,
688                                unsigned int day, unsigned int dow,
689                                unsigned int hour, unsigned int minute,
690                                unsigned int second)
691 {
692         unsigned char clock_enable_pkt[IMON_CLOCK_ENABLE_PACKETS][8];
693         int retval = 0;
694         int i;
695 
696         if (!ictx) {
697                 pr_err("no context for device\n");
698                 return -ENODEV;
699         }
700 
701         switch (ictx->display_type) {
702         case IMON_DISPLAY_TYPE_LCD:
703                 clock_enable_pkt[0][0] = 0x80;
704                 clock_enable_pkt[0][1] = year;
705                 clock_enable_pkt[0][2] = month-1;
706                 clock_enable_pkt[0][3] = day;
707                 clock_enable_pkt[0][4] = hour;
708                 clock_enable_pkt[0][5] = minute;
709                 clock_enable_pkt[0][6] = second;
710 
711                 clock_enable_pkt[1][0] = 0x80;
712                 clock_enable_pkt[1][1] = 0;
713                 clock_enable_pkt[1][2] = 0;
714                 clock_enable_pkt[1][3] = 0;
715                 clock_enable_pkt[1][4] = 0;
716                 clock_enable_pkt[1][5] = 0;
717                 clock_enable_pkt[1][6] = 0;
718 
719                 if (ictx->product == 0xffdc) {
720                         clock_enable_pkt[0][7] = 0x50;
721                         clock_enable_pkt[1][7] = 0x51;
722                 } else {
723                         clock_enable_pkt[0][7] = 0x88;
724                         clock_enable_pkt[1][7] = 0x8a;
725                 }
726 
727                 break;
728 
729         case IMON_DISPLAY_TYPE_VFD:
730                 clock_enable_pkt[0][0] = year;
731                 clock_enable_pkt[0][1] = month-1;
732                 clock_enable_pkt[0][2] = day;
733                 clock_enable_pkt[0][3] = dow;
734                 clock_enable_pkt[0][4] = hour;
735                 clock_enable_pkt[0][5] = minute;
736                 clock_enable_pkt[0][6] = second;
737                 clock_enable_pkt[0][7] = 0x40;
738 
739                 clock_enable_pkt[1][0] = 0;
740                 clock_enable_pkt[1][1] = 0;
741                 clock_enable_pkt[1][2] = 1;
742                 clock_enable_pkt[1][3] = 0;
743                 clock_enable_pkt[1][4] = 0;
744                 clock_enable_pkt[1][5] = 0;
745                 clock_enable_pkt[1][6] = 0;
746                 clock_enable_pkt[1][7] = 0x42;
747 
748                 break;
749 
750         default:
751                 return -ENODEV;
752         }
753 
754         for (i = 0; i < IMON_CLOCK_ENABLE_PACKETS; i++) {
755                 memcpy(ictx->usb_tx_buf, clock_enable_pkt[i], 8);
756                 retval = send_packet(ictx);
757                 if (retval) {
758                         pr_err("send_packet failed for packet %d\n", i);
759                         break;
760                 }
761         }
762 
763         return retval;
764 }
765 
766 /**
767  * These are the sysfs functions to handle the association on the iMON 2.4G LT.
768  */
769 static ssize_t show_associate_remote(struct device *d,
770                                      struct device_attribute *attr,
771                                      char *buf)
772 {
773         struct imon_context *ictx = dev_get_drvdata(d);
774 
775         if (!ictx)
776                 return -ENODEV;
777 
778         mutex_lock(&ictx->lock);
779         if (ictx->rf_isassociating)
780                 strcpy(buf, "associating\n");
781         else
782                 strcpy(buf, "closed\n");
783 
784         dev_info(d, "Visit http://www.lirc.org/html/imon-24g.html for instructions on how to associate your iMON 2.4G DT/LT remote\n");
785         mutex_unlock(&ictx->lock);
786         return strlen(buf);
787 }
788 
789 static ssize_t store_associate_remote(struct device *d,
790                                       struct device_attribute *attr,
791                                       const char *buf, size_t count)
792 {
793         struct imon_context *ictx;
794 
795         ictx = dev_get_drvdata(d);
796 
797         if (!ictx)
798                 return -ENODEV;
799 
800         mutex_lock(&ictx->lock);
801         ictx->rf_isassociating = true;
802         send_associate_24g(ictx);
803         mutex_unlock(&ictx->lock);
804 
805         return count;
806 }
807 
808 /**
809  * sysfs functions to control internal imon clock
810  */
811 static ssize_t show_imon_clock(struct device *d,
812                                struct device_attribute *attr, char *buf)
813 {
814         struct imon_context *ictx = dev_get_drvdata(d);
815         size_t len;
816 
817         if (!ictx)
818                 return -ENODEV;
819 
820         mutex_lock(&ictx->lock);
821 
822         if (!ictx->display_supported) {
823                 len = snprintf(buf, PAGE_SIZE, "Not supported.");
824         } else {
825                 len = snprintf(buf, PAGE_SIZE,
826                         "To set the clock on your iMON display:\n"
827                         "# date \"+%%y %%m %%d %%w %%H %%M %%S\" > imon_clock\n"
828                         "%s", ictx->display_isopen ?
829                         "\nNOTE: imon device must be closed\n" : "");
830         }
831 
832         mutex_unlock(&ictx->lock);
833 
834         return len;
835 }
836 
837 static ssize_t store_imon_clock(struct device *d,
838                                 struct device_attribute *attr,
839                                 const char *buf, size_t count)
840 {
841         struct imon_context *ictx = dev_get_drvdata(d);
842         ssize_t retval;
843         unsigned int year, month, day, dow, hour, minute, second;
844 
845         if (!ictx)
846                 return -ENODEV;
847 
848         mutex_lock(&ictx->lock);
849 
850         if (!ictx->display_supported) {
851                 retval = -ENODEV;
852                 goto exit;
853         } else if (ictx->display_isopen) {
854                 retval = -EBUSY;
855                 goto exit;
856         }
857 
858         if (sscanf(buf, "%u %u %u %u %u %u %u", &year, &month, &day, &dow,
859                    &hour, &minute, &second) != 7) {
860                 retval = -EINVAL;
861                 goto exit;
862         }
863 
864         if ((month < 1 || month > 12) ||
865             (day < 1 || day > 31) || (dow > 6) ||
866             (hour > 23) || (minute > 59) || (second > 59)) {
867                 retval = -EINVAL;
868                 goto exit;
869         }
870 
871         retval = send_set_imon_clock(ictx, year, month, day, dow,
872                                      hour, minute, second);
873         if (retval)
874                 goto exit;
875 
876         retval = count;
877 exit:
878         mutex_unlock(&ictx->lock);
879 
880         return retval;
881 }
882 
883 
884 static DEVICE_ATTR(imon_clock, S_IWUSR | S_IRUGO, show_imon_clock,
885                    store_imon_clock);
886 
887 static DEVICE_ATTR(associate_remote, S_IWUSR | S_IRUGO, show_associate_remote,
888                    store_associate_remote);
889 
890 static struct attribute *imon_display_sysfs_entries[] = {
891         &dev_attr_imon_clock.attr,
892         NULL
893 };
894 
895 static struct attribute_group imon_display_attr_group = {
896         .attrs = imon_display_sysfs_entries
897 };
898 
899 static struct attribute *imon_rf_sysfs_entries[] = {
900         &dev_attr_associate_remote.attr,
901         NULL
902 };
903 
904 static struct attribute_group imon_rf_attr_group = {
905         .attrs = imon_rf_sysfs_entries
906 };
907 
908 /**
909  * Writes data to the VFD.  The iMON VFD is 2x16 characters
910  * and requires data in 5 consecutive USB interrupt packets,
911  * each packet but the last carrying 7 bytes.
912  *
913  * I don't know if the VFD board supports features such as
914  * scrolling, clearing rows, blanking, etc. so at
915  * the caller must provide a full screen of data.  If fewer
916  * than 32 bytes are provided spaces will be appended to
917  * generate a full screen.
918  */
919 static ssize_t vfd_write(struct file *file, const char __user *buf,
920                          size_t n_bytes, loff_t *pos)
921 {
922         int i;
923         int offset;
924         int seq;
925         int retval = 0;
926         struct imon_context *ictx;
927         const unsigned char vfd_packet6[] = {
928                 0x01, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF };
929 
930         ictx = file->private_data;
931         if (!ictx) {
932                 pr_err_ratelimited("no context for device\n");
933                 return -ENODEV;
934         }
935 
936         mutex_lock(&ictx->lock);
937 
938         if (!ictx->dev_present_intf0) {
939                 pr_err_ratelimited("no iMON device present\n");
940                 retval = -ENODEV;
941                 goto exit;
942         }
943 
944         if (n_bytes <= 0 || n_bytes > 32) {
945                 pr_err_ratelimited("invalid payload size\n");
946                 retval = -EINVAL;
947                 goto exit;
948         }
949 
950         if (copy_from_user(ictx->tx.data_buf, buf, n_bytes)) {
951                 retval = -EFAULT;
952                 goto exit;
953         }
954 
955         /* Pad with spaces */
956         for (i = n_bytes; i < 32; ++i)
957                 ictx->tx.data_buf[i] = ' ';
958 
959         for (i = 32; i < 35; ++i)
960                 ictx->tx.data_buf[i] = 0xFF;
961 
962         offset = 0;
963         seq = 0;
964 
965         do {
966                 memcpy(ictx->usb_tx_buf, ictx->tx.data_buf + offset, 7);
967                 ictx->usb_tx_buf[7] = (unsigned char) seq;
968 
969                 retval = send_packet(ictx);
970                 if (retval) {
971                         pr_err_ratelimited("send packet #%d failed\n", seq / 2);
972                         goto exit;
973                 } else {
974                         seq += 2;
975                         offset += 7;
976                 }
977 
978         } while (offset < 35);
979 
980         /* Send packet #6 */
981         memcpy(ictx->usb_tx_buf, &vfd_packet6, sizeof(vfd_packet6));
982         ictx->usb_tx_buf[7] = (unsigned char) seq;
983         retval = send_packet(ictx);
984         if (retval)
985                 pr_err_ratelimited("send packet #%d failed\n", seq / 2);
986 
987 exit:
988         mutex_unlock(&ictx->lock);
989 
990         return (!retval) ? n_bytes : retval;
991 }
992 
993 /**
994  * Writes data to the LCD.  The iMON OEM LCD screen expects 8-byte
995  * packets. We accept data as 16 hexadecimal digits, followed by a
996  * newline (to make it easy to drive the device from a command-line
997  * -- even though the actual binary data is a bit complicated).
998  *
999  * The device itself is not a "traditional" text-mode display. It's
1000  * actually a 16x96 pixel bitmap display. That means if you want to
1001  * display text, you've got to have your own "font" and translate the
1002  * text into bitmaps for display. This is really flexible (you can
1003  * display whatever diacritics you need, and so on), but it's also
1004  * a lot more complicated than most LCDs...
1005  */
1006 static ssize_t lcd_write(struct file *file, const char __user *buf,
1007                          size_t n_bytes, loff_t *pos)
1008 {
1009         int retval = 0;
1010         struct imon_context *ictx;
1011 
1012         ictx = file->private_data;
1013         if (!ictx) {
1014                 pr_err_ratelimited("no context for device\n");
1015                 return -ENODEV;
1016         }
1017 
1018         mutex_lock(&ictx->lock);
1019 
1020         if (!ictx->display_supported) {
1021                 pr_err_ratelimited("no iMON display present\n");
1022                 retval = -ENODEV;
1023                 goto exit;
1024         }
1025 
1026         if (n_bytes != 8) {
1027                 pr_err_ratelimited("invalid payload size: %d (expected 8)\n",
1028                                    (int)n_bytes);
1029                 retval = -EINVAL;
1030                 goto exit;
1031         }
1032 
1033         if (copy_from_user(ictx->usb_tx_buf, buf, 8)) {
1034                 retval = -EFAULT;
1035                 goto exit;
1036         }
1037 
1038         retval = send_packet(ictx);
1039         if (retval) {
1040                 pr_err_ratelimited("send packet failed!\n");
1041                 goto exit;
1042         } else {
1043                 dev_dbg(ictx->dev, "%s: write %d bytes to LCD\n",
1044                         __func__, (int) n_bytes);
1045         }
1046 exit:
1047         mutex_unlock(&ictx->lock);
1048         return (!retval) ? n_bytes : retval;
1049 }
1050 
1051 /**
1052  * Callback function for USB core API: transmit data
1053  */
1054 static void usb_tx_callback(struct urb *urb)
1055 {
1056         struct imon_context *ictx;
1057 
1058         if (!urb)
1059                 return;
1060         ictx = (struct imon_context *)urb->context;
1061         if (!ictx)
1062                 return;
1063 
1064         ictx->tx.status = urb->status;
1065 
1066         /* notify waiters that write has finished */
1067         ictx->tx.busy = false;
1068         smp_rmb(); /* ensure later readers know we're not busy */
1069         complete(&ictx->tx.finished);
1070 }
1071 
1072 /**
1073  * report touchscreen input
1074  */
1075 static void imon_touch_display_timeout(unsigned long data)
1076 {
1077         struct imon_context *ictx = (struct imon_context *)data;
1078 
1079         if (ictx->display_type != IMON_DISPLAY_TYPE_VGA)
1080                 return;
1081 
1082         input_report_abs(ictx->touch, ABS_X, ictx->touch_x);
1083         input_report_abs(ictx->touch, ABS_Y, ictx->touch_y);
1084         input_report_key(ictx->touch, BTN_TOUCH, 0x00);
1085         input_sync(ictx->touch);
1086 }
1087 
1088 /**
1089  * iMON IR receivers support two different signal sets -- those used by
1090  * the iMON remotes, and those used by the Windows MCE remotes (which is
1091  * really just RC-6), but only one or the other at a time, as the signals
1092  * are decoded onboard the receiver.
1093  *
1094  * This function gets called two different ways, one way is from
1095  * rc_register_device, for initial protocol selection/setup, and the other is
1096  * via a userspace-initiated protocol change request, either by direct sysfs
1097  * prodding or by something like ir-keytable. In the rc_register_device case,
1098  * the imon context lock is already held, but when initiated from userspace,
1099  * it is not, so we must acquire it prior to calling send_packet, which
1100  * requires that the lock is held.
1101  */
1102 static int imon_ir_change_protocol(struct rc_dev *rc, u64 *rc_type)
1103 {
1104         int retval;
1105         struct imon_context *ictx = rc->priv;
1106         struct device *dev = ictx->dev;
1107         bool unlock = false;
1108         unsigned char ir_proto_packet[] = {
1109                 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x86 };
1110 
1111         if (*rc_type && !(*rc_type & rc->allowed_protocols))
1112                 dev_warn(dev, "Looks like you're trying to use an IR protocol this device does not support\n");
1113 
1114         if (*rc_type & RC_BIT_RC6_MCE) {
1115                 dev_dbg(dev, "Configuring IR receiver for MCE protocol\n");
1116                 ir_proto_packet[0] = 0x01;
1117                 *rc_type = RC_BIT_RC6_MCE;
1118         } else if (*rc_type & RC_BIT_OTHER) {
1119                 dev_dbg(dev, "Configuring IR receiver for iMON protocol\n");
1120                 if (!pad_stabilize)
1121                         dev_dbg(dev, "PAD stabilize functionality disabled\n");
1122                 /* ir_proto_packet[0] = 0x00; // already the default */
1123                 *rc_type = RC_BIT_OTHER;
1124         } else {
1125                 dev_warn(dev, "Unsupported IR protocol specified, overriding to iMON IR protocol\n");
1126                 if (!pad_stabilize)
1127                         dev_dbg(dev, "PAD stabilize functionality disabled\n");
1128                 /* ir_proto_packet[0] = 0x00; // already the default */
1129                 *rc_type = RC_BIT_OTHER;
1130         }
1131 
1132         memcpy(ictx->usb_tx_buf, &ir_proto_packet, sizeof(ir_proto_packet));
1133 
1134         if (!mutex_is_locked(&ictx->lock)) {
1135                 unlock = true;
1136                 mutex_lock(&ictx->lock);
1137         }
1138 
1139         retval = send_packet(ictx);
1140         if (retval)
1141                 goto out;
1142 
1143         ictx->rc_type = *rc_type;
1144         ictx->pad_mouse = false;
1145 
1146 out:
1147         if (unlock)
1148                 mutex_unlock(&ictx->lock);
1149 
1150         return retval;
1151 }
1152 
1153 static inline int tv2int(const struct timeval *a, const struct timeval *b)
1154 {
1155         int usecs = 0;
1156         int sec   = 0;
1157 
1158         if (b->tv_usec > a->tv_usec) {
1159                 usecs = 1000000;
1160                 sec--;
1161         }
1162 
1163         usecs += a->tv_usec - b->tv_usec;
1164 
1165         sec += a->tv_sec - b->tv_sec;
1166         sec *= 1000;
1167         usecs /= 1000;
1168         sec += usecs;
1169 
1170         if (sec < 0)
1171                 sec = 1000;
1172 
1173         return sec;
1174 }
1175 
1176 /**
1177  * The directional pad behaves a bit differently, depending on whether this is
1178  * one of the older ffdc devices or a newer device. Newer devices appear to
1179  * have a higher resolution matrix for more precise mouse movement, but it
1180  * makes things overly sensitive in keyboard mode, so we do some interesting
1181  * contortions to make it less touchy. Older devices run through the same
1182  * routine with shorter timeout and a smaller threshold.
1183  */
1184 static int stabilize(int a, int b, u16 timeout, u16 threshold)
1185 {
1186         struct timeval ct;
1187         static struct timeval prev_time = {0, 0};
1188         static struct timeval hit_time  = {0, 0};
1189         static int x, y, prev_result, hits;
1190         int result = 0;
1191         int msec, msec_hit;
1192 
1193         do_gettimeofday(&ct);
1194         msec = tv2int(&ct, &prev_time);
1195         msec_hit = tv2int(&ct, &hit_time);
1196 
1197         if (msec > 100) {
1198                 x = 0;
1199                 y = 0;
1200                 hits = 0;
1201         }
1202 
1203         x += a;
1204         y += b;
1205 
1206         prev_time = ct;
1207 
1208         if (abs(x) > threshold || abs(y) > threshold) {
1209                 if (abs(y) > abs(x))
1210                         result = (y > 0) ? 0x7F : 0x80;
1211                 else
1212                         result = (x > 0) ? 0x7F00 : 0x8000;
1213 
1214                 x = 0;
1215                 y = 0;
1216 
1217                 if (result == prev_result) {
1218                         hits++;
1219 
1220                         if (hits > 3) {
1221                                 switch (result) {
1222                                 case 0x7F:
1223                                         y = 17 * threshold / 30;
1224                                         break;
1225                                 case 0x80:
1226                                         y -= 17 * threshold / 30;
1227                                         break;
1228                                 case 0x7F00:
1229                                         x = 17 * threshold / 30;
1230                                         break;
1231                                 case 0x8000:
1232                                         x -= 17 * threshold / 30;
1233                                         break;
1234                                 }
1235                         }
1236 
1237                         if (hits == 2 && msec_hit < timeout) {
1238                                 result = 0;
1239                                 hits = 1;
1240                         }
1241                 } else {
1242                         prev_result = result;
1243                         hits = 1;
1244                         hit_time = ct;
1245                 }
1246         }
1247 
1248         return result;
1249 }
1250 
1251 static u32 imon_remote_key_lookup(struct imon_context *ictx, u32 scancode)
1252 {
1253         u32 keycode;
1254         u32 release;
1255         bool is_release_code = false;
1256 
1257         /* Look for the initial press of a button */
1258         keycode = rc_g_keycode_from_table(ictx->rdev, scancode);
1259         ictx->rc_toggle = 0x0;
1260         ictx->rc_scancode = scancode;
1261 
1262         /* Look for the release of a button */
1263         if (keycode == KEY_RESERVED) {
1264                 release = scancode & ~0x4000;
1265                 keycode = rc_g_keycode_from_table(ictx->rdev, release);
1266                 if (keycode != KEY_RESERVED)
1267                         is_release_code = true;
1268         }
1269 
1270         ictx->release_code = is_release_code;
1271 
1272         return keycode;
1273 }
1274 
1275 static u32 imon_mce_key_lookup(struct imon_context *ictx, u32 scancode)
1276 {
1277         u32 keycode;
1278 
1279 #define MCE_KEY_MASK 0x7000
1280 #define MCE_TOGGLE_BIT 0x8000
1281 
1282         /*
1283          * On some receivers, mce keys decode to 0x8000f04xx and 0x8000f84xx
1284          * (the toggle bit flipping between alternating key presses), while
1285          * on other receivers, we see 0x8000f74xx and 0x8000ff4xx. To keep
1286          * the table trim, we always or in the bits to look up 0x8000ff4xx,
1287          * but we can't or them into all codes, as some keys are decoded in
1288          * a different way w/o the same use of the toggle bit...
1289          */
1290         if (scancode & 0x80000000)
1291                 scancode = scancode | MCE_KEY_MASK | MCE_TOGGLE_BIT;
1292 
1293         ictx->rc_scancode = scancode;
1294         keycode = rc_g_keycode_from_table(ictx->rdev, scancode);
1295 
1296         /* not used in mce mode, but make sure we know its false */
1297         ictx->release_code = false;
1298 
1299         return keycode;
1300 }
1301 
1302 static u32 imon_panel_key_lookup(struct imon_context *ictx, u64 code)
1303 {
1304         int i;
1305         u32 keycode = KEY_RESERVED;
1306         struct imon_panel_key_table *key_table = ictx->dev_descr->key_table;
1307 
1308         for (i = 0; key_table[i].hw_code != 0; i++) {
1309                 if (key_table[i].hw_code == (code | 0xffee)) {
1310                         keycode = key_table[i].keycode;
1311                         break;
1312                 }
1313         }
1314         ictx->release_code = false;
1315         return keycode;
1316 }
1317 
1318 static bool imon_mouse_event(struct imon_context *ictx,
1319                              unsigned char *buf, int len)
1320 {
1321         signed char rel_x = 0x00, rel_y = 0x00;
1322         u8 right_shift = 1;
1323         bool mouse_input = true;
1324         int dir = 0;
1325         unsigned long flags;
1326 
1327         spin_lock_irqsave(&ictx->kc_lock, flags);
1328 
1329         /* newer iMON device PAD or mouse button */
1330         if (ictx->product != 0xffdc && (buf[0] & 0x01) && len == 5) {
1331                 rel_x = buf[2];
1332                 rel_y = buf[3];
1333                 right_shift = 1;
1334         /* 0xffdc iMON PAD or mouse button input */
1335         } else if (ictx->product == 0xffdc && (buf[0] & 0x40) &&
1336                         !((buf[1] & 0x01) || ((buf[1] >> 2) & 0x01))) {
1337                 rel_x = (buf[1] & 0x08) | (buf[1] & 0x10) >> 2 |
1338                         (buf[1] & 0x20) >> 4 | (buf[1] & 0x40) >> 6;
1339                 if (buf[0] & 0x02)
1340                         rel_x |= ~0x0f;
1341                 rel_x = rel_x + rel_x / 2;
1342                 rel_y = (buf[2] & 0x08) | (buf[2] & 0x10) >> 2 |
1343                         (buf[2] & 0x20) >> 4 | (buf[2] & 0x40) >> 6;
1344                 if (buf[0] & 0x01)
1345                         rel_y |= ~0x0f;
1346                 rel_y = rel_y + rel_y / 2;
1347                 right_shift = 2;
1348         /* some ffdc devices decode mouse buttons differently... */
1349         } else if (ictx->product == 0xffdc && (buf[0] == 0x68)) {
1350                 right_shift = 2;
1351         /* ch+/- buttons, which we use for an emulated scroll wheel */
1352         } else if (ictx->kc == KEY_CHANNELUP && (buf[2] & 0x40) != 0x40) {
1353                 dir = 1;
1354         } else if (ictx->kc == KEY_CHANNELDOWN && (buf[2] & 0x40) != 0x40) {
1355                 dir = -1;
1356         } else
1357                 mouse_input = false;
1358 
1359         spin_unlock_irqrestore(&ictx->kc_lock, flags);
1360 
1361         if (mouse_input) {
1362                 dev_dbg(ictx->dev, "sending mouse data via input subsystem\n");
1363 
1364                 if (dir) {
1365                         input_report_rel(ictx->idev, REL_WHEEL, dir);
1366                 } else if (rel_x || rel_y) {
1367                         input_report_rel(ictx->idev, REL_X, rel_x);
1368                         input_report_rel(ictx->idev, REL_Y, rel_y);
1369                 } else {
1370                         input_report_key(ictx->idev, BTN_LEFT, buf[1] & 0x1);
1371                         input_report_key(ictx->idev, BTN_RIGHT,
1372                                          buf[1] >> right_shift & 0x1);
1373                 }
1374                 input_sync(ictx->idev);
1375                 spin_lock_irqsave(&ictx->kc_lock, flags);
1376                 ictx->last_keycode = ictx->kc;
1377                 spin_unlock_irqrestore(&ictx->kc_lock, flags);
1378         }
1379 
1380         return mouse_input;
1381 }
1382 
1383 static void imon_touch_event(struct imon_context *ictx, unsigned char *buf)
1384 {
1385         mod_timer(&ictx->ttimer, jiffies + TOUCH_TIMEOUT);
1386         ictx->touch_x = (buf[0] << 4) | (buf[1] >> 4);
1387         ictx->touch_y = 0xfff - ((buf[2] << 4) | (buf[1] & 0xf));
1388         input_report_abs(ictx->touch, ABS_X, ictx->touch_x);
1389         input_report_abs(ictx->touch, ABS_Y, ictx->touch_y);
1390         input_report_key(ictx->touch, BTN_TOUCH, 0x01);
1391         input_sync(ictx->touch);
1392 }
1393 
1394 static void imon_pad_to_keys(struct imon_context *ictx, unsigned char *buf)
1395 {
1396         int dir = 0;
1397         signed char rel_x = 0x00, rel_y = 0x00;
1398         u16 timeout, threshold;
1399         u32 scancode = KEY_RESERVED;
1400         unsigned long flags;
1401 
1402         /*
1403          * The imon directional pad functions more like a touchpad. Bytes 3 & 4
1404          * contain a position coordinate (x,y), with each component ranging
1405          * from -14 to 14. We want to down-sample this to only 4 discrete values
1406          * for up/down/left/right arrow keys. Also, when you get too close to
1407          * diagonals, it has a tendency to jump back and forth, so lets try to
1408          * ignore when they get too close.
1409          */
1410         if (ictx->product != 0xffdc) {
1411                 /* first, pad to 8 bytes so it conforms with everything else */
1412                 buf[5] = buf[6] = buf[7] = 0;
1413                 timeout = 500;  /* in msecs */
1414                 /* (2*threshold) x (2*threshold) square */
1415                 threshold = pad_thresh ? pad_thresh : 28;
1416                 rel_x = buf[2];
1417                 rel_y = buf[3];
1418 
1419                 if (ictx->rc_type == RC_BIT_OTHER && pad_stabilize) {
1420                         if ((buf[1] == 0) && ((rel_x != 0) || (rel_y != 0))) {
1421                                 dir = stabilize((int)rel_x, (int)rel_y,
1422                                                 timeout, threshold);
1423                                 if (!dir) {
1424                                         spin_lock_irqsave(&ictx->kc_lock,
1425                                                           flags);
1426                                         ictx->kc = KEY_UNKNOWN;
1427                                         spin_unlock_irqrestore(&ictx->kc_lock,
1428                                                                flags);
1429                                         return;
1430                                 }
1431                                 buf[2] = dir & 0xFF;
1432                                 buf[3] = (dir >> 8) & 0xFF;
1433                                 scancode = be32_to_cpu(*((__be32 *)buf));
1434                         }
1435                 } else {
1436                         /*
1437                          * Hack alert: instead of using keycodes, we have
1438                          * to use hard-coded scancodes here...
1439                          */
1440                         if (abs(rel_y) > abs(rel_x)) {
1441                                 buf[2] = (rel_y > 0) ? 0x7F : 0x80;
1442                                 buf[3] = 0;
1443                                 if (rel_y > 0)
1444                                         scancode = 0x01007f00; /* KEY_DOWN */
1445                                 else
1446                                         scancode = 0x01008000; /* KEY_UP */
1447                         } else {
1448                                 buf[2] = 0;
1449                                 buf[3] = (rel_x > 0) ? 0x7F : 0x80;
1450                                 if (rel_x > 0)
1451                                         scancode = 0x0100007f; /* KEY_RIGHT */
1452                                 else
1453                                         scancode = 0x01000080; /* KEY_LEFT */
1454                         }
1455                 }
1456 
1457         /*
1458          * Handle on-board decoded pad events for e.g. older VFD/iMON-Pad
1459          * device (15c2:ffdc). The remote generates various codes from
1460          * 0x68nnnnB7 to 0x6AnnnnB7, the left mouse button generates
1461          * 0x688301b7 and the right one 0x688481b7. All other keys generate
1462          * 0x2nnnnnnn. Position coordinate is encoded in buf[1] and buf[2] with
1463          * reversed endianness. Extract direction from buffer, rotate endianness,
1464          * adjust sign and feed the values into stabilize(). The resulting codes
1465          * will be 0x01008000, 0x01007F00, which match the newer devices.
1466          */
1467         } else {
1468                 timeout = 10;   /* in msecs */
1469                 /* (2*threshold) x (2*threshold) square */
1470                 threshold = pad_thresh ? pad_thresh : 15;
1471 
1472                 /* buf[1] is x */
1473                 rel_x = (buf[1] & 0x08) | (buf[1] & 0x10) >> 2 |
1474                         (buf[1] & 0x20) >> 4 | (buf[1] & 0x40) >> 6;
1475                 if (buf[0] & 0x02)
1476                         rel_x |= ~0x10+1;
1477                 /* buf[2] is y */
1478                 rel_y = (buf[2] & 0x08) | (buf[2] & 0x10) >> 2 |
1479                         (buf[2] & 0x20) >> 4 | (buf[2] & 0x40) >> 6;
1480                 if (buf[0] & 0x01)
1481                         rel_y |= ~0x10+1;
1482 
1483                 buf[0] = 0x01;
1484                 buf[1] = buf[4] = buf[5] = buf[6] = buf[7] = 0;
1485 
1486                 if (ictx->rc_type == RC_BIT_OTHER && pad_stabilize) {
1487                         dir = stabilize((int)rel_x, (int)rel_y,
1488                                         timeout, threshold);
1489                         if (!dir) {
1490                                 spin_lock_irqsave(&ictx->kc_lock, flags);
1491                                 ictx->kc = KEY_UNKNOWN;
1492                                 spin_unlock_irqrestore(&ictx->kc_lock, flags);
1493                                 return;
1494                         }
1495                         buf[2] = dir & 0xFF;
1496                         buf[3] = (dir >> 8) & 0xFF;
1497                         scancode = be32_to_cpu(*((__be32 *)buf));
1498                 } else {
1499                         /*
1500                          * Hack alert: instead of using keycodes, we have
1501                          * to use hard-coded scancodes here...
1502                          */
1503                         if (abs(rel_y) > abs(rel_x)) {
1504                                 buf[2] = (rel_y > 0) ? 0x7F : 0x80;
1505                                 buf[3] = 0;
1506                                 if (rel_y > 0)
1507                                         scancode = 0x01007f00; /* KEY_DOWN */
1508                                 else
1509                                         scancode = 0x01008000; /* KEY_UP */
1510                         } else {
1511                                 buf[2] = 0;
1512                                 buf[3] = (rel_x > 0) ? 0x7F : 0x80;
1513                                 if (rel_x > 0)
1514                                         scancode = 0x0100007f; /* KEY_RIGHT */
1515                                 else
1516                                         scancode = 0x01000080; /* KEY_LEFT */
1517                         }
1518                 }
1519         }
1520 
1521         if (scancode) {
1522                 spin_lock_irqsave(&ictx->kc_lock, flags);
1523                 ictx->kc = imon_remote_key_lookup(ictx, scancode);
1524                 spin_unlock_irqrestore(&ictx->kc_lock, flags);
1525         }
1526 }
1527 
1528 /**
1529  * figure out if these is a press or a release. We don't actually
1530  * care about repeats, as those will be auto-generated within the IR
1531  * subsystem for repeating scancodes.
1532  */
1533 static int imon_parse_press_type(struct imon_context *ictx,
1534                                  unsigned char *buf, u8 ktype)
1535 {
1536         int press_type = 0;
1537         unsigned long flags;
1538 
1539         spin_lock_irqsave(&ictx->kc_lock, flags);
1540 
1541         /* key release of 0x02XXXXXX key */
1542         if (ictx->kc == KEY_RESERVED && buf[0] == 0x02 && buf[3] == 0x00)
1543                 ictx->kc = ictx->last_keycode;
1544 
1545         /* mouse button release on (some) 0xffdc devices */
1546         else if (ictx->kc == KEY_RESERVED && buf[0] == 0x68 && buf[1] == 0x82 &&
1547                  buf[2] == 0x81 && buf[3] == 0xb7)
1548                 ictx->kc = ictx->last_keycode;
1549 
1550         /* mouse button release on (some other) 0xffdc devices */
1551         else if (ictx->kc == KEY_RESERVED && buf[0] == 0x01 && buf[1] == 0x00 &&
1552                  buf[2] == 0x81 && buf[3] == 0xb7)
1553                 ictx->kc = ictx->last_keycode;
1554 
1555         /* mce-specific button handling, no keyup events */
1556         else if (ktype == IMON_KEY_MCE) {
1557                 ictx->rc_toggle = buf[2];
1558                 press_type = 1;
1559 
1560         /* incoherent or irrelevant data */
1561         } else if (ictx->kc == KEY_RESERVED)
1562                 press_type = -EINVAL;
1563 
1564         /* key release of 0xXXXXXXb7 key */
1565         else if (ictx->release_code)
1566                 press_type = 0;
1567 
1568         /* this is a button press */
1569         else
1570                 press_type = 1;
1571 
1572         spin_unlock_irqrestore(&ictx->kc_lock, flags);
1573 
1574         return press_type;
1575 }
1576 
1577 /**
1578  * Process the incoming packet
1579  */
1580 static void imon_incoming_packet(struct imon_context *ictx,
1581                                  struct urb *urb, int intf)
1582 {
1583         int len = urb->actual_length;
1584         unsigned char *buf = urb->transfer_buffer;
1585         struct device *dev = ictx->dev;
1586         unsigned long flags;
1587         u32 kc;
1588         u64 scancode;
1589         int press_type = 0;
1590         int msec;
1591         struct timeval t;
1592         static struct timeval prev_time = { 0, 0 };
1593         u8 ktype;
1594 
1595         /* filter out junk data on the older 0xffdc imon devices */
1596         if ((buf[0] == 0xff) && (buf[1] == 0xff) && (buf[2] == 0xff))
1597                 return;
1598 
1599         /* Figure out what key was pressed */
1600         if (len == 8 && buf[7] == 0xee) {
1601                 scancode = be64_to_cpu(*((__be64 *)buf));
1602                 ktype = IMON_KEY_PANEL;
1603                 kc = imon_panel_key_lookup(ictx, scancode);
1604                 ictx->release_code = false;
1605         } else {
1606                 scancode = be32_to_cpu(*((__be32 *)buf));
1607                 if (ictx->rc_type == RC_BIT_RC6_MCE) {
1608                         ktype = IMON_KEY_IMON;
1609                         if (buf[0] == 0x80)
1610                                 ktype = IMON_KEY_MCE;
1611                         kc = imon_mce_key_lookup(ictx, scancode);
1612                 } else {
1613                         ktype = IMON_KEY_IMON;
1614                         kc = imon_remote_key_lookup(ictx, scancode);
1615                 }
1616         }
1617 
1618         spin_lock_irqsave(&ictx->kc_lock, flags);
1619         /* keyboard/mouse mode toggle button */
1620         if (kc == KEY_KEYBOARD && !ictx->release_code) {
1621                 ictx->last_keycode = kc;
1622                 if (!nomouse) {
1623                         ictx->pad_mouse = ~(ictx->pad_mouse) & 0x1;
1624                         dev_dbg(dev, "toggling to %s mode\n",
1625                                 ictx->pad_mouse ? "mouse" : "keyboard");
1626                         spin_unlock_irqrestore(&ictx->kc_lock, flags);
1627                         return;
1628                 } else {
1629                         ictx->pad_mouse = false;
1630                         dev_dbg(dev, "mouse mode disabled, passing key value\n");
1631                 }
1632         }
1633 
1634         ictx->kc = kc;
1635         spin_unlock_irqrestore(&ictx->kc_lock, flags);
1636 
1637         /* send touchscreen events through input subsystem if touchpad data */
1638         if (ictx->display_type == IMON_DISPLAY_TYPE_VGA && len == 8 &&
1639             buf[7] == 0x86) {
1640                 imon_touch_event(ictx, buf);
1641                 return;
1642 
1643         /* look for mouse events with pad in mouse mode */
1644         } else if (ictx->pad_mouse) {
1645                 if (imon_mouse_event(ictx, buf, len))
1646                         return;
1647         }
1648 
1649         /* Now for some special handling to convert pad input to arrow keys */
1650         if (((len == 5) && (buf[0] == 0x01) && (buf[4] == 0x00)) ||
1651             ((len == 8) && (buf[0] & 0x40) &&
1652              !(buf[1] & 0x1 || buf[1] >> 2 & 0x1))) {
1653                 len = 8;
1654                 imon_pad_to_keys(ictx, buf);
1655         }
1656 
1657         if (debug) {
1658                 printk(KERN_INFO "intf%d decoded packet: %*ph\n",
1659                        intf, len, buf);
1660         }
1661 
1662         press_type = imon_parse_press_type(ictx, buf, ktype);
1663         if (press_type < 0)
1664                 goto not_input_data;
1665 
1666         if (ktype != IMON_KEY_PANEL) {
1667                 if (press_type == 0)
1668                         rc_keyup(ictx->rdev);
1669                 else {
1670                         if (ictx->rc_type == RC_BIT_RC6_MCE ||
1671                             ictx->rc_type == RC_BIT_OTHER)
1672                                 rc_keydown(ictx->rdev,
1673                                            ictx->rc_type == RC_BIT_RC6_MCE ? RC_TYPE_RC6_MCE : RC_TYPE_OTHER,
1674                                            ictx->rc_scancode, ictx->rc_toggle);
1675                         spin_lock_irqsave(&ictx->kc_lock, flags);
1676                         ictx->last_keycode = ictx->kc;
1677                         spin_unlock_irqrestore(&ictx->kc_lock, flags);
1678                 }
1679                 return;
1680         }
1681 
1682         /* Only panel type events left to process now */
1683         spin_lock_irqsave(&ictx->kc_lock, flags);
1684 
1685         do_gettimeofday(&t);
1686         /* KEY_MUTE repeats from knob need to be suppressed */
1687         if (ictx->kc == KEY_MUTE && ictx->kc == ictx->last_keycode) {
1688                 msec = tv2int(&t, &prev_time);
1689                 if (msec < ictx->idev->rep[REP_DELAY]) {
1690                         spin_unlock_irqrestore(&ictx->kc_lock, flags);
1691                         return;
1692                 }
1693         }
1694         prev_time = t;
1695         kc = ictx->kc;
1696 
1697         spin_unlock_irqrestore(&ictx->kc_lock, flags);
1698 
1699         input_report_key(ictx->idev, kc, press_type);
1700         input_sync(ictx->idev);
1701 
1702         /* panel keys don't generate a release */
1703         input_report_key(ictx->idev, kc, 0);
1704         input_sync(ictx->idev);
1705 
1706         spin_lock_irqsave(&ictx->kc_lock, flags);
1707         ictx->last_keycode = kc;
1708         spin_unlock_irqrestore(&ictx->kc_lock, flags);
1709 
1710         return;
1711 
1712 not_input_data:
1713         if (len != 8) {
1714                 dev_warn(dev, "imon %s: invalid incoming packet size (len = %d, intf%d)\n",
1715                          __func__, len, intf);
1716                 return;
1717         }
1718 
1719         /* iMON 2.4G associate frame */
1720         if (buf[0] == 0x00 &&
1721             buf[2] == 0xFF &&                           /* REFID */
1722             buf[3] == 0xFF &&
1723             buf[4] == 0xFF &&
1724             buf[5] == 0xFF &&                           /* iMON 2.4G */
1725            ((buf[6] == 0x4E && buf[7] == 0xDF) ||       /* LT */
1726             (buf[6] == 0x5E && buf[7] == 0xDF))) {      /* DT */
1727                 dev_warn(dev, "%s: remote associated refid=%02X\n",
1728                          __func__, buf[1]);
1729                 ictx->rf_isassociating = false;
1730         }
1731 }
1732 
1733 /**
1734  * Callback function for USB core API: receive data
1735  */
1736 static void usb_rx_callback_intf0(struct urb *urb)
1737 {
1738         struct imon_context *ictx;
1739         int intfnum = 0;
1740 
1741         if (!urb)
1742                 return;
1743 
1744         ictx = (struct imon_context *)urb->context;
1745         if (!ictx)
1746                 return;
1747 
1748         /*
1749          * if we get a callback before we're done configuring the hardware, we
1750          * can't yet process the data, as there's nowhere to send it, but we
1751          * still need to submit a new rx URB to avoid wedging the hardware
1752          */
1753         if (!ictx->dev_present_intf0)
1754                 goto out;
1755 
1756         switch (urb->status) {
1757         case -ENOENT:           /* usbcore unlink successful! */
1758                 return;
1759 
1760         case -ESHUTDOWN:        /* transport endpoint was shut down */
1761                 break;
1762 
1763         case 0:
1764                 imon_incoming_packet(ictx, urb, intfnum);
1765                 break;
1766 
1767         default:
1768                 dev_warn(ictx->dev, "imon %s: status(%d): ignored\n",
1769                          __func__, urb->status);
1770                 break;
1771         }
1772 
1773 out:
1774         usb_submit_urb(ictx->rx_urb_intf0, GFP_ATOMIC);
1775 }
1776 
1777 static void usb_rx_callback_intf1(struct urb *urb)
1778 {
1779         struct imon_context *ictx;
1780         int intfnum = 1;
1781 
1782         if (!urb)
1783                 return;
1784 
1785         ictx = (struct imon_context *)urb->context;
1786         if (!ictx)
1787                 return;
1788 
1789         /*
1790          * if we get a callback before we're done configuring the hardware, we
1791          * can't yet process the data, as there's nowhere to send it, but we
1792          * still need to submit a new rx URB to avoid wedging the hardware
1793          */
1794         if (!ictx->dev_present_intf1)
1795                 goto out;
1796 
1797         switch (urb->status) {
1798         case -ENOENT:           /* usbcore unlink successful! */
1799                 return;
1800 
1801         case -ESHUTDOWN:        /* transport endpoint was shut down */
1802                 break;
1803 
1804         case 0:
1805                 imon_incoming_packet(ictx, urb, intfnum);
1806                 break;
1807 
1808         default:
1809                 dev_warn(ictx->dev, "imon %s: status(%d): ignored\n",
1810                          __func__, urb->status);
1811                 break;
1812         }
1813 
1814 out:
1815         usb_submit_urb(ictx->rx_urb_intf1, GFP_ATOMIC);
1816 }
1817 
1818 /*
1819  * The 0x15c2:0xffdc device ID was used for umpteen different imon
1820  * devices, and all of them constantly spew interrupts, even when there
1821  * is no actual data to report. However, byte 6 of this buffer looks like
1822  * its unique across device variants, so we're trying to key off that to
1823  * figure out which display type (if any) and what IR protocol the device
1824  * actually supports. These devices have their IR protocol hard-coded into
1825  * their firmware, they can't be changed on the fly like the newer hardware.
1826  */
1827 static void imon_get_ffdc_type(struct imon_context *ictx)
1828 {
1829         u8 ffdc_cfg_byte = ictx->usb_rx_buf[6];
1830         u8 detected_display_type = IMON_DISPLAY_TYPE_NONE;
1831         u64 allowed_protos = RC_BIT_OTHER;
1832 
1833         switch (ffdc_cfg_byte) {
1834         /* iMON Knob, no display, iMON IR + vol knob */
1835         case 0x21:
1836                 dev_info(ictx->dev, "0xffdc iMON Knob, iMON IR");
1837                 ictx->display_supported = false;
1838                 break;
1839         /* iMON 2.4G LT (usb stick), no display, iMON RF */
1840         case 0x4e:
1841                 dev_info(ictx->dev, "0xffdc iMON 2.4G LT, iMON RF");
1842                 ictx->display_supported = false;
1843                 ictx->rf_device = true;
1844                 break;
1845         /* iMON VFD, no IR (does have vol knob tho) */
1846         case 0x35:
1847                 dev_info(ictx->dev, "0xffdc iMON VFD + knob, no IR");
1848                 detected_display_type = IMON_DISPLAY_TYPE_VFD;
1849                 break;
1850         /* iMON VFD, iMON IR */
1851         case 0x24:
1852         case 0x85:
1853                 dev_info(ictx->dev, "0xffdc iMON VFD, iMON IR");
1854                 detected_display_type = IMON_DISPLAY_TYPE_VFD;
1855                 break;
1856         /* iMON VFD, MCE IR */
1857         case 0x46:
1858         case 0x7e:
1859         case 0x9e:
1860                 dev_info(ictx->dev, "0xffdc iMON VFD, MCE IR");
1861                 detected_display_type = IMON_DISPLAY_TYPE_VFD;
1862                 allowed_protos = RC_BIT_RC6_MCE;
1863                 break;
1864         /* iMON LCD, MCE IR */
1865         case 0x9f:
1866                 dev_info(ictx->dev, "0xffdc iMON LCD, MCE IR");
1867                 detected_display_type = IMON_DISPLAY_TYPE_LCD;
1868                 allowed_protos = RC_BIT_RC6_MCE;
1869                 break;
1870         default:
1871                 dev_info(ictx->dev, "Unknown 0xffdc device, defaulting to VFD and iMON IR");
1872                 detected_display_type = IMON_DISPLAY_TYPE_VFD;
1873                 /* We don't know which one it is, allow user to set the
1874                  * RC6 one from userspace if OTHER wasn't correct. */
1875                 allowed_protos |= RC_BIT_RC6_MCE;
1876                 break;
1877         }
1878 
1879         printk(KERN_CONT " (id 0x%02x)\n", ffdc_cfg_byte);
1880 
1881         ictx->display_type = detected_display_type;
1882         ictx->rc_type = allowed_protos;
1883 }
1884 
1885 static void imon_set_display_type(struct imon_context *ictx)
1886 {
1887         u8 configured_display_type = IMON_DISPLAY_TYPE_VFD;
1888 
1889         /*
1890          * Try to auto-detect the type of display if the user hasn't set
1891          * it by hand via the display_type modparam. Default is VFD.
1892          */
1893 
1894         if (display_type == IMON_DISPLAY_TYPE_AUTO) {
1895                 switch (ictx->product) {
1896                 case 0xffdc:
1897                         /* set in imon_get_ffdc_type() */
1898                         configured_display_type = ictx->display_type;
1899                         break;
1900                 case 0x0034:
1901                 case 0x0035:
1902                         configured_display_type = IMON_DISPLAY_TYPE_VGA;
1903                         break;
1904                 case 0x0038:
1905                 case 0x0039:
1906                 case 0x0045:
1907                         configured_display_type = IMON_DISPLAY_TYPE_LCD;
1908                         break;
1909                 case 0x003c:
1910                 case 0x0041:
1911                 case 0x0042:
1912                 case 0x0043:
1913                         configured_display_type = IMON_DISPLAY_TYPE_NONE;
1914                         ictx->display_supported = false;
1915                         break;
1916                 case 0x0036:
1917                 case 0x0044:
1918                 default:
1919                         configured_display_type = IMON_DISPLAY_TYPE_VFD;
1920                         break;
1921                 }
1922         } else {
1923                 configured_display_type = display_type;
1924                 if (display_type == IMON_DISPLAY_TYPE_NONE)
1925                         ictx->display_supported = false;
1926                 else
1927                         ictx->display_supported = true;
1928                 dev_info(ictx->dev, "%s: overriding display type to %d via modparam\n",
1929                          __func__, display_type);
1930         }
1931 
1932         ictx->display_type = configured_display_type;
1933 }
1934 
1935 static struct rc_dev *imon_init_rdev(struct imon_context *ictx)
1936 {
1937         struct rc_dev *rdev;
1938         int ret;
1939         const unsigned char fp_packet[] = { 0x40, 0x00, 0x00, 0x00,
1940                                             0x00, 0x00, 0x00, 0x88 };
1941 
1942         rdev = rc_allocate_device();
1943         if (!rdev) {
1944                 dev_err(ictx->dev, "remote control dev allocation failed\n");
1945                 goto out;
1946         }
1947 
1948         snprintf(ictx->name_rdev, sizeof(ictx->name_rdev),
1949                  "iMON Remote (%04x:%04x)", ictx->vendor, ictx->product);
1950         usb_make_path(ictx->usbdev_intf0, ictx->phys_rdev,
1951                       sizeof(ictx->phys_rdev));
1952         strlcat(ictx->phys_rdev, "/input0", sizeof(ictx->phys_rdev));
1953 
1954         rdev->input_name = ictx->name_rdev;
1955         rdev->input_phys = ictx->phys_rdev;
1956         usb_to_input_id(ictx->usbdev_intf0, &rdev->input_id);
1957         rdev->dev.parent = ictx->dev;
1958 
1959         rdev->priv = ictx;
1960         rdev->driver_type = RC_DRIVER_SCANCODE;
1961         rdev->allowed_protocols = RC_BIT_OTHER | RC_BIT_RC6_MCE; /* iMON PAD or MCE */
1962         rdev->change_protocol = imon_ir_change_protocol;
1963         rdev->driver_name = MOD_NAME;
1964 
1965         /* Enable front-panel buttons and/or knobs */
1966         memcpy(ictx->usb_tx_buf, &fp_packet, sizeof(fp_packet));
1967         ret = send_packet(ictx);
1968         /* Not fatal, but warn about it */
1969         if (ret)
1970                 dev_info(ictx->dev, "panel buttons/knobs setup failed\n");
1971 
1972         if (ictx->product == 0xffdc) {
1973                 imon_get_ffdc_type(ictx);
1974                 rdev->allowed_protocols = ictx->rc_type;
1975         }
1976 
1977         imon_set_display_type(ictx);
1978 
1979         if (ictx->rc_type == RC_BIT_RC6_MCE)
1980                 rdev->map_name = RC_MAP_IMON_MCE;
1981         else
1982                 rdev->map_name = RC_MAP_IMON_PAD;
1983 
1984         ret = rc_register_device(rdev);
1985         if (ret < 0) {
1986                 dev_err(ictx->dev, "remote input dev register failed\n");
1987                 goto out;
1988         }
1989 
1990         return rdev;
1991 
1992 out:
1993         rc_free_device(rdev);
1994         return NULL;
1995 }
1996 
1997 static struct input_dev *imon_init_idev(struct imon_context *ictx)
1998 {
1999         struct imon_panel_key_table *key_table = ictx->dev_descr->key_table;
2000         struct input_dev *idev;
2001         int ret, i;
2002 
2003         idev = input_allocate_device();
2004         if (!idev)
2005                 goto out;
2006 
2007         snprintf(ictx->name_idev, sizeof(ictx->name_idev),
2008                  "iMON Panel, Knob and Mouse(%04x:%04x)",
2009                  ictx->vendor, ictx->product);
2010         idev->name = ictx->name_idev;
2011 
2012         usb_make_path(ictx->usbdev_intf0, ictx->phys_idev,
2013                       sizeof(ictx->phys_idev));
2014         strlcat(ictx->phys_idev, "/input1", sizeof(ictx->phys_idev));
2015         idev->phys = ictx->phys_idev;
2016 
2017         idev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP) | BIT_MASK(EV_REL);
2018 
2019         idev->keybit[BIT_WORD(BTN_MOUSE)] =
2020                 BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_RIGHT);
2021         idev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y) |
2022                 BIT_MASK(REL_WHEEL);
2023 
2024         /* panel and/or knob code support */
2025         for (i = 0; key_table[i].hw_code != 0; i++) {
2026                 u32 kc = key_table[i].keycode;
2027                 __set_bit(kc, idev->keybit);
2028         }
2029 
2030         usb_to_input_id(ictx->usbdev_intf0, &idev->id);
2031         idev->dev.parent = ictx->dev;
2032         input_set_drvdata(idev, ictx);
2033 
2034         ret = input_register_device(idev);
2035         if (ret < 0) {
2036                 dev_err(ictx->dev, "input dev register failed\n");
2037                 goto out;
2038         }
2039 
2040         return idev;
2041 
2042 out:
2043         input_free_device(idev);
2044         return NULL;
2045 }
2046 
2047 static struct input_dev *imon_init_touch(struct imon_context *ictx)
2048 {
2049         struct input_dev *touch;
2050         int ret;
2051 
2052         touch = input_allocate_device();
2053         if (!touch)
2054                 goto touch_alloc_failed;
2055 
2056         snprintf(ictx->name_touch, sizeof(ictx->name_touch),
2057                  "iMON USB Touchscreen (%04x:%04x)",
2058                  ictx->vendor, ictx->product);
2059         touch->name = ictx->name_touch;
2060 
2061         usb_make_path(ictx->usbdev_intf1, ictx->phys_touch,
2062                       sizeof(ictx->phys_touch));
2063         strlcat(ictx->phys_touch, "/input2", sizeof(ictx->phys_touch));
2064         touch->phys = ictx->phys_touch;
2065 
2066         touch->evbit[0] =
2067                 BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
2068         touch->keybit[BIT_WORD(BTN_TOUCH)] =
2069                 BIT_MASK(BTN_TOUCH);
2070         input_set_abs_params(touch, ABS_X,
2071                              0x00, 0xfff, 0, 0);
2072         input_set_abs_params(touch, ABS_Y,
2073                              0x00, 0xfff, 0, 0);
2074 
2075         input_set_drvdata(touch, ictx);
2076 
2077         usb_to_input_id(ictx->usbdev_intf1, &touch->id);
2078         touch->dev.parent = ictx->dev;
2079         ret = input_register_device(touch);
2080         if (ret <  0) {
2081                 dev_info(ictx->dev, "touchscreen input dev register failed\n");
2082                 goto touch_register_failed;
2083         }
2084 
2085         return touch;
2086 
2087 touch_register_failed:
2088         input_free_device(touch);
2089 
2090 touch_alloc_failed:
2091         return NULL;
2092 }
2093 
2094 static bool imon_find_endpoints(struct imon_context *ictx,
2095                                 struct usb_host_interface *iface_desc)
2096 {
2097         struct usb_endpoint_descriptor *ep;
2098         struct usb_endpoint_descriptor *rx_endpoint = NULL;
2099         struct usb_endpoint_descriptor *tx_endpoint = NULL;
2100         int ifnum = iface_desc->desc.bInterfaceNumber;
2101         int num_endpts = iface_desc->desc.bNumEndpoints;
2102         int i, ep_dir, ep_type;
2103         bool ir_ep_found = false;
2104         bool display_ep_found = false;
2105         bool tx_control = false;
2106 
2107         /*
2108          * Scan the endpoint list and set:
2109          *      first input endpoint = IR endpoint
2110          *      first output endpoint = display endpoint
2111          */
2112         for (i = 0; i < num_endpts && !(ir_ep_found && display_ep_found); ++i) {
2113                 ep = &iface_desc->endpoint[i].desc;
2114                 ep_dir = ep->bEndpointAddress & USB_ENDPOINT_DIR_MASK;
2115                 ep_type = usb_endpoint_type(ep);
2116 
2117                 if (!ir_ep_found && ep_dir == USB_DIR_IN &&
2118                     ep_type == USB_ENDPOINT_XFER_INT) {
2119 
2120                         rx_endpoint = ep;
2121                         ir_ep_found = true;
2122                         dev_dbg(ictx->dev, "%s: found IR endpoint\n", __func__);
2123 
2124                 } else if (!display_ep_found && ep_dir == USB_DIR_OUT &&
2125                            ep_type == USB_ENDPOINT_XFER_INT) {
2126                         tx_endpoint = ep;
2127                         display_ep_found = true;
2128                         dev_dbg(ictx->dev, "%s: found display endpoint\n", __func__);
2129                 }
2130         }
2131 
2132         if (ifnum == 0) {
2133                 ictx->rx_endpoint_intf0 = rx_endpoint;
2134                 /*
2135                  * tx is used to send characters to lcd/vfd, associate RF
2136                  * remotes, set IR protocol, and maybe more...
2137                  */
2138                 ictx->tx_endpoint = tx_endpoint;
2139         } else {
2140                 ictx->rx_endpoint_intf1 = rx_endpoint;
2141         }
2142 
2143         /*
2144          * If we didn't find a display endpoint, this is probably one of the
2145          * newer iMON devices that use control urb instead of interrupt
2146          */
2147         if (!display_ep_found) {
2148                 tx_control = true;
2149                 display_ep_found = true;
2150                 dev_dbg(ictx->dev, "%s: device uses control endpoint, not interface OUT endpoint\n",
2151                         __func__);
2152         }
2153 
2154         /*
2155          * Some iMON receivers have no display. Unfortunately, it seems
2156          * that SoundGraph recycles device IDs between devices both with
2157          * and without... :\
2158          */
2159         if (ictx->display_type == IMON_DISPLAY_TYPE_NONE) {
2160                 display_ep_found = false;
2161                 dev_dbg(ictx->dev, "%s: device has no display\n", __func__);
2162         }
2163 
2164         /*
2165          * iMON Touch devices have a VGA touchscreen, but no "display", as
2166          * that refers to e.g. /dev/lcd0 (a character device LCD or VFD).
2167          */
2168         if (ictx->display_type == IMON_DISPLAY_TYPE_VGA) {
2169                 display_ep_found = false;
2170                 dev_dbg(ictx->dev, "%s: iMON Touch device found\n", __func__);
2171         }
2172 
2173         /* Input endpoint is mandatory */
2174         if (!ir_ep_found)
2175                 pr_err("no valid input (IR) endpoint found\n");
2176 
2177         ictx->tx_control = tx_control;
2178 
2179         if (display_ep_found)
2180                 ictx->display_supported = true;
2181 
2182         return ir_ep_found;
2183 
2184 }
2185 
2186 static struct imon_context *imon_init_intf0(struct usb_interface *intf,
2187                                             const struct usb_device_id *id)
2188 {
2189         struct imon_context *ictx;
2190         struct urb *rx_urb;
2191         struct urb *tx_urb;
2192         struct device *dev = &intf->dev;
2193         struct usb_host_interface *iface_desc;
2194         int ret = -ENOMEM;
2195 
2196         ictx = kzalloc(sizeof(struct imon_context), GFP_KERNEL);
2197         if (!ictx) {
2198                 dev_err(dev, "%s: kzalloc failed for context", __func__);
2199                 goto exit;
2200         }
2201         rx_urb = usb_alloc_urb(0, GFP_KERNEL);
2202         if (!rx_urb)
2203                 goto rx_urb_alloc_failed;
2204         tx_urb = usb_alloc_urb(0, GFP_KERNEL);
2205         if (!tx_urb)
2206                 goto tx_urb_alloc_failed;
2207 
2208         mutex_init(&ictx->lock);
2209         spin_lock_init(&ictx->kc_lock);
2210 
2211         mutex_lock(&ictx->lock);
2212 
2213         ictx->dev = dev;
2214         ictx->usbdev_intf0 = usb_get_dev(interface_to_usbdev(intf));
2215         ictx->rx_urb_intf0 = rx_urb;
2216         ictx->tx_urb = tx_urb;
2217         ictx->rf_device = false;
2218 
2219         init_completion(&ictx->tx.finished);
2220 
2221         ictx->vendor  = le16_to_cpu(ictx->usbdev_intf0->descriptor.idVendor);
2222         ictx->product = le16_to_cpu(ictx->usbdev_intf0->descriptor.idProduct);
2223 
2224         /* save drive info for later accessing the panel/knob key table */
2225         ictx->dev_descr = (struct imon_usb_dev_descr *)id->driver_info;
2226         /* default send_packet delay is 5ms but some devices need more */
2227         ictx->send_packet_delay = ictx->dev_descr->flags &
2228                                   IMON_NEED_20MS_PKT_DELAY ? 20 : 5;
2229 
2230         ret = -ENODEV;
2231         iface_desc = intf->cur_altsetting;
2232         if (!imon_find_endpoints(ictx, iface_desc)) {
2233                 goto find_endpoint_failed;
2234         }
2235 
2236         usb_fill_int_urb(ictx->rx_urb_intf0, ictx->usbdev_intf0,
2237                 usb_rcvintpipe(ictx->usbdev_intf0,
2238                         ictx->rx_endpoint_intf0->bEndpointAddress),
2239                 ictx->usb_rx_buf, sizeof(ictx->usb_rx_buf),
2240                 usb_rx_callback_intf0, ictx,
2241                 ictx->rx_endpoint_intf0->bInterval);
2242 
2243         ret = usb_submit_urb(ictx->rx_urb_intf0, GFP_KERNEL);
2244         if (ret) {
2245                 pr_err("usb_submit_urb failed for intf0 (%d)\n", ret);
2246                 goto urb_submit_failed;
2247         }
2248 
2249         ictx->idev = imon_init_idev(ictx);
2250         if (!ictx->idev) {
2251                 dev_err(dev, "%s: input device setup failed\n", __func__);
2252                 goto idev_setup_failed;
2253         }
2254 
2255         ictx->rdev = imon_init_rdev(ictx);
2256         if (!ictx->rdev) {
2257                 dev_err(dev, "%s: rc device setup failed\n", __func__);
2258                 goto rdev_setup_failed;
2259         }
2260 
2261         ictx->dev_present_intf0 = true;
2262 
2263         mutex_unlock(&ictx->lock);
2264         return ictx;
2265 
2266 rdev_setup_failed:
2267         input_unregister_device(ictx->idev);
2268 idev_setup_failed:
2269         usb_kill_urb(ictx->rx_urb_intf0);
2270 urb_submit_failed:
2271 find_endpoint_failed:
2272         usb_put_dev(ictx->usbdev_intf0);
2273         mutex_unlock(&ictx->lock);
2274         usb_free_urb(tx_urb);
2275 tx_urb_alloc_failed:
2276         usb_free_urb(rx_urb);
2277 rx_urb_alloc_failed:
2278         kfree(ictx);
2279 exit:
2280         dev_err(dev, "unable to initialize intf0, err %d\n", ret);
2281 
2282         return NULL;
2283 }
2284 
2285 static struct imon_context *imon_init_intf1(struct usb_interface *intf,
2286                                             struct imon_context *ictx)
2287 {
2288         struct urb *rx_urb;
2289         struct usb_host_interface *iface_desc;
2290         int ret = -ENOMEM;
2291 
2292         rx_urb = usb_alloc_urb(0, GFP_KERNEL);
2293         if (!rx_urb)
2294                 goto rx_urb_alloc_failed;
2295 
2296         mutex_lock(&ictx->lock);
2297 
2298         if (ictx->display_type == IMON_DISPLAY_TYPE_VGA) {
2299                 init_timer(&ictx->ttimer);
2300                 ictx->ttimer.data = (unsigned long)ictx;
2301                 ictx->ttimer.function = imon_touch_display_timeout;
2302         }
2303 
2304         ictx->usbdev_intf1 = usb_get_dev(interface_to_usbdev(intf));
2305         ictx->rx_urb_intf1 = rx_urb;
2306 
2307         ret = -ENODEV;
2308         iface_desc = intf->cur_altsetting;
2309         if (!imon_find_endpoints(ictx, iface_desc))
2310                 goto find_endpoint_failed;
2311 
2312         if (ictx->display_type == IMON_DISPLAY_TYPE_VGA) {
2313                 ictx->touch = imon_init_touch(ictx);
2314                 if (!ictx->touch)
2315                         goto touch_setup_failed;
2316         } else
2317                 ictx->touch = NULL;
2318 
2319         usb_fill_int_urb(ictx->rx_urb_intf1, ictx->usbdev_intf1,
2320                 usb_rcvintpipe(ictx->usbdev_intf1,
2321                         ictx->rx_endpoint_intf1->bEndpointAddress),
2322                 ictx->usb_rx_buf, sizeof(ictx->usb_rx_buf),
2323                 usb_rx_callback_intf1, ictx,
2324                 ictx->rx_endpoint_intf1->bInterval);
2325 
2326         ret = usb_submit_urb(ictx->rx_urb_intf1, GFP_KERNEL);
2327 
2328         if (ret) {
2329                 pr_err("usb_submit_urb failed for intf1 (%d)\n", ret);
2330                 goto urb_submit_failed;
2331         }
2332 
2333         ictx->dev_present_intf1 = true;
2334 
2335         mutex_unlock(&ictx->lock);
2336         return ictx;
2337 
2338 urb_submit_failed:
2339         if (ictx->touch)
2340                 input_unregister_device(ictx->touch);
2341 touch_setup_failed:
2342 find_endpoint_failed:
2343         usb_put_dev(ictx->usbdev_intf1);
2344         mutex_unlock(&ictx->lock);
2345         usb_free_urb(rx_urb);
2346 rx_urb_alloc_failed:
2347         dev_err(ictx->dev, "unable to initialize intf1, err %d\n", ret);
2348 
2349         return NULL;
2350 }
2351 
2352 static void imon_init_display(struct imon_context *ictx,
2353                               struct usb_interface *intf)
2354 {
2355         int ret;
2356 
2357         dev_dbg(ictx->dev, "Registering iMON display with sysfs\n");
2358 
2359         /* set up sysfs entry for built-in clock */
2360         ret = sysfs_create_group(&intf->dev.kobj, &imon_display_attr_group);
2361         if (ret)
2362                 dev_err(ictx->dev, "Could not create display sysfs entries(%d)",
2363                         ret);
2364 
2365         if (ictx->display_type == IMON_DISPLAY_TYPE_LCD)
2366                 ret = usb_register_dev(intf, &imon_lcd_class);
2367         else
2368                 ret = usb_register_dev(intf, &imon_vfd_class);
2369         if (ret)
2370                 /* Not a fatal error, so ignore */
2371                 dev_info(ictx->dev, "could not get a minor number for display\n");
2372 
2373 }
2374 
2375 /**
2376  * Callback function for USB core API: Probe
2377  */
2378 static int imon_probe(struct usb_interface *interface,
2379                       const struct usb_device_id *id)
2380 {
2381         struct usb_device *usbdev = NULL;
2382         struct usb_host_interface *iface_desc = NULL;
2383         struct usb_interface *first_if;
2384         struct device *dev = &interface->dev;
2385         int ifnum, sysfs_err;
2386         int ret = 0;
2387         struct imon_context *ictx = NULL;
2388         struct imon_context *first_if_ctx = NULL;
2389         u16 vendor, product;
2390 
2391         usbdev     = usb_get_dev(interface_to_usbdev(interface));
2392         iface_desc = interface->cur_altsetting;
2393         ifnum      = iface_desc->desc.bInterfaceNumber;
2394         vendor     = le16_to_cpu(usbdev->descriptor.idVendor);
2395         product    = le16_to_cpu(usbdev->descriptor.idProduct);
2396 
2397         dev_dbg(dev, "%s: found iMON device (%04x:%04x, intf%d)\n",
2398                 __func__, vendor, product, ifnum);
2399 
2400         /* prevent races probing devices w/multiple interfaces */
2401         mutex_lock(&driver_lock);
2402 
2403         first_if = usb_ifnum_to_if(usbdev, 0);
2404         first_if_ctx = usb_get_intfdata(first_if);
2405 
2406         if (ifnum == 0) {
2407                 ictx = imon_init_intf0(interface, id);
2408                 if (!ictx) {
2409                         pr_err("failed to initialize context!\n");
2410                         ret = -ENODEV;
2411                         goto fail;
2412                 }
2413 
2414         } else {
2415                 /* this is the secondary interface on the device */
2416 
2417                 /* fail early if first intf failed to register */
2418                 if (!first_if_ctx) {
2419                         ret = -ENODEV;
2420                         goto fail;
2421                 }
2422 
2423                 ictx = imon_init_intf1(interface, first_if_ctx);
2424                 if (!ictx) {
2425                         pr_err("failed to attach to context!\n");
2426                         ret = -ENODEV;
2427                         goto fail;
2428                 }
2429 
2430         }
2431 
2432         usb_set_intfdata(interface, ictx);
2433 
2434         if (ifnum == 0) {
2435                 mutex_lock(&ictx->lock);
2436 
2437                 if (product == 0xffdc && ictx->rf_device) {
2438                         sysfs_err = sysfs_create_group(&interface->dev.kobj,
2439                                                        &imon_rf_attr_group);
2440                         if (sysfs_err)
2441                                 pr_err("Could not create RF sysfs entries(%d)\n",
2442                                        sysfs_err);
2443                 }
2444 
2445                 if (ictx->display_supported)
2446                         imon_init_display(ictx, interface);
2447 
2448                 mutex_unlock(&ictx->lock);
2449         }
2450 
2451         dev_info(dev, "iMON device (%04x:%04x, intf%d) on usb<%d:%d> initialized\n",
2452                  vendor, product, ifnum,
2453                  usbdev->bus->busnum, usbdev->devnum);
2454 
2455         mutex_unlock(&driver_lock);
2456         usb_put_dev(usbdev);
2457 
2458         return 0;
2459 
2460 fail:
2461         mutex_unlock(&driver_lock);
2462         usb_put_dev(usbdev);
2463         dev_err(dev, "unable to register, err %d\n", ret);
2464 
2465         return ret;
2466 }
2467 
2468 /**
2469  * Callback function for USB core API: disconnect
2470  */
2471 static void imon_disconnect(struct usb_interface *interface)
2472 {
2473         struct imon_context *ictx;
2474         struct device *dev;
2475         int ifnum;
2476 
2477         /* prevent races with multi-interface device probing and display_open */
2478         mutex_lock(&driver_lock);
2479 
2480         ictx = usb_get_intfdata(interface);
2481         dev = ictx->dev;
2482         ifnum = interface->cur_altsetting->desc.bInterfaceNumber;
2483 
2484         /*
2485          * sysfs_remove_group is safe to call even if sysfs_create_group
2486          * hasn't been called
2487          */
2488         sysfs_remove_group(&interface->dev.kobj, &imon_display_attr_group);
2489         sysfs_remove_group(&interface->dev.kobj, &imon_rf_attr_group);
2490 
2491         usb_set_intfdata(interface, NULL);
2492 
2493         /* Abort ongoing write */
2494         if (ictx->tx.busy) {
2495                 usb_kill_urb(ictx->tx_urb);
2496                 complete(&ictx->tx.finished);
2497         }
2498 
2499         if (ifnum == 0) {
2500                 ictx->dev_present_intf0 = false;
2501                 usb_kill_urb(ictx->rx_urb_intf0);
2502                 usb_put_dev(ictx->usbdev_intf0);
2503                 input_unregister_device(ictx->idev);
2504                 rc_unregister_device(ictx->rdev);
2505                 if (ictx->display_supported) {
2506                         if (ictx->display_type == IMON_DISPLAY_TYPE_LCD)
2507                                 usb_deregister_dev(interface, &imon_lcd_class);
2508                         else if (ictx->display_type == IMON_DISPLAY_TYPE_VFD)
2509                                 usb_deregister_dev(interface, &imon_vfd_class);
2510                 }
2511         } else {
2512                 ictx->dev_present_intf1 = false;
2513                 usb_kill_urb(ictx->rx_urb_intf1);
2514                 usb_put_dev(ictx->usbdev_intf1);
2515                 if (ictx->display_type == IMON_DISPLAY_TYPE_VGA) {
2516                         input_unregister_device(ictx->touch);
2517                         del_timer_sync(&ictx->ttimer);
2518                 }
2519         }
2520 
2521         if (!ictx->dev_present_intf0 && !ictx->dev_present_intf1)
2522                 free_imon_context(ictx);
2523 
2524         mutex_unlock(&driver_lock);
2525 
2526         dev_dbg(dev, "%s: iMON device (intf%d) disconnected\n",
2527                 __func__, ifnum);
2528 }
2529 
2530 static int imon_suspend(struct usb_interface *intf, pm_message_t message)
2531 {
2532         struct imon_context *ictx = usb_get_intfdata(intf);
2533         int ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
2534 
2535         if (ifnum == 0)
2536                 usb_kill_urb(ictx->rx_urb_intf0);
2537         else
2538                 usb_kill_urb(ictx->rx_urb_intf1);
2539 
2540         return 0;
2541 }
2542 
2543 static int imon_resume(struct usb_interface *intf)
2544 {
2545         int rc = 0;
2546         struct imon_context *ictx = usb_get_intfdata(intf);
2547         int ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
2548 
2549         if (ifnum == 0) {
2550                 usb_fill_int_urb(ictx->rx_urb_intf0, ictx->usbdev_intf0,
2551                         usb_rcvintpipe(ictx->usbdev_intf0,
2552                                 ictx->rx_endpoint_intf0->bEndpointAddress),
2553                         ictx->usb_rx_buf, sizeof(ictx->usb_rx_buf),
2554                         usb_rx_callback_intf0, ictx,
2555                         ictx->rx_endpoint_intf0->bInterval);
2556 
2557                 rc = usb_submit_urb(ictx->rx_urb_intf0, GFP_ATOMIC);
2558 
2559         } else {
2560                 usb_fill_int_urb(ictx->rx_urb_intf1, ictx->usbdev_intf1,
2561                         usb_rcvintpipe(ictx->usbdev_intf1,
2562                                 ictx->rx_endpoint_intf1->bEndpointAddress),
2563                         ictx->usb_rx_buf, sizeof(ictx->usb_rx_buf),
2564                         usb_rx_callback_intf1, ictx,
2565                         ictx->rx_endpoint_intf1->bInterval);
2566 
2567                 rc = usb_submit_urb(ictx->rx_urb_intf1, GFP_ATOMIC);
2568         }
2569 
2570         return rc;
2571 }
2572 
2573 module_usb_driver(imon_driver);
2574 

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