Version:  2.0.40 2.2.26 2.4.37 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18

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, "
445                  "1=vfd, 2=lcd, 3=vga, 4=none (default: autodetect)");
446 
447 static int pad_stabilize = 1;
448 module_param(pad_stabilize, int, S_IRUGO | S_IWUSR);
449 MODULE_PARM_DESC(pad_stabilize, "Apply stabilization algorithm to iMON PAD "
450                  "presses in arrow key mode. 0=disable, 1=enable (default).");
451 
452 /*
453  * In certain use cases, mouse mode isn't really helpful, and could actually
454  * cause confusion, so allow disabling it when the IR device is open.
455  */
456 static bool nomouse;
457 module_param(nomouse, bool, S_IRUGO | S_IWUSR);
458 MODULE_PARM_DESC(nomouse, "Disable mouse input device mode when IR device is "
459                  "open. 0=don't disable, 1=disable. (default: don't disable)");
460 
461 /* threshold at which a pad push registers as an arrow key in kbd mode */
462 static int pad_thresh;
463 module_param(pad_thresh, int, S_IRUGO | S_IWUSR);
464 MODULE_PARM_DESC(pad_thresh, "Threshold at which a pad push registers as an "
465                  "arrow key in kbd mode (default: 28)");
466 
467 
468 static void free_imon_context(struct imon_context *ictx)
469 {
470         struct device *dev = ictx->dev;
471 
472         usb_free_urb(ictx->tx_urb);
473         usb_free_urb(ictx->rx_urb_intf0);
474         usb_free_urb(ictx->rx_urb_intf1);
475         kfree(ictx);
476 
477         dev_dbg(dev, "%s: iMON context freed\n", __func__);
478 }
479 
480 /**
481  * Called when the Display device (e.g. /dev/lcd0)
482  * is opened by the application.
483  */
484 static int display_open(struct inode *inode, struct file *file)
485 {
486         struct usb_interface *interface;
487         struct imon_context *ictx = NULL;
488         int subminor;
489         int retval = 0;
490 
491         /* prevent races with disconnect */
492         mutex_lock(&driver_lock);
493 
494         subminor = iminor(inode);
495         interface = usb_find_interface(&imon_driver, subminor);
496         if (!interface) {
497                 pr_err("could not find interface for minor %d\n", subminor);
498                 retval = -ENODEV;
499                 goto exit;
500         }
501         ictx = usb_get_intfdata(interface);
502 
503         if (!ictx) {
504                 pr_err("no context found for minor %d\n", subminor);
505                 retval = -ENODEV;
506                 goto exit;
507         }
508 
509         mutex_lock(&ictx->lock);
510 
511         if (!ictx->display_supported) {
512                 pr_err("display not supported by device\n");
513                 retval = -ENODEV;
514         } else if (ictx->display_isopen) {
515                 pr_err("display port is already open\n");
516                 retval = -EBUSY;
517         } else {
518                 ictx->display_isopen = true;
519                 file->private_data = ictx;
520                 dev_dbg(ictx->dev, "display port opened\n");
521         }
522 
523         mutex_unlock(&ictx->lock);
524 
525 exit:
526         mutex_unlock(&driver_lock);
527         return retval;
528 }
529 
530 /**
531  * Called when the display device (e.g. /dev/lcd0)
532  * is closed by the application.
533  */
534 static int display_close(struct inode *inode, struct file *file)
535 {
536         struct imon_context *ictx = NULL;
537         int retval = 0;
538 
539         ictx = file->private_data;
540 
541         if (!ictx) {
542                 pr_err("no context for device\n");
543                 return -ENODEV;
544         }
545 
546         mutex_lock(&ictx->lock);
547 
548         if (!ictx->display_supported) {
549                 pr_err("display not supported by device\n");
550                 retval = -ENODEV;
551         } else if (!ictx->display_isopen) {
552                 pr_err("display is not open\n");
553                 retval = -EIO;
554         } else {
555                 ictx->display_isopen = false;
556                 dev_dbg(ictx->dev, "display port closed\n");
557         }
558 
559         mutex_unlock(&ictx->lock);
560         return retval;
561 }
562 
563 /**
564  * Sends a packet to the device -- this function must be called with
565  * ictx->lock held, or its unlock/lock sequence while waiting for tx
566  * to complete can/will lead to a deadlock.
567  */
568 static int send_packet(struct imon_context *ictx)
569 {
570         unsigned int pipe;
571         unsigned long timeout;
572         int interval = 0;
573         int retval = 0;
574         struct usb_ctrlrequest *control_req = NULL;
575 
576         /* Check if we need to use control or interrupt urb */
577         if (!ictx->tx_control) {
578                 pipe = usb_sndintpipe(ictx->usbdev_intf0,
579                                       ictx->tx_endpoint->bEndpointAddress);
580                 interval = ictx->tx_endpoint->bInterval;
581 
582                 usb_fill_int_urb(ictx->tx_urb, ictx->usbdev_intf0, pipe,
583                                  ictx->usb_tx_buf,
584                                  sizeof(ictx->usb_tx_buf),
585                                  usb_tx_callback, ictx, interval);
586 
587                 ictx->tx_urb->actual_length = 0;
588         } else {
589                 /* fill request into kmalloc'ed space: */
590                 control_req = kmalloc(sizeof(struct usb_ctrlrequest),
591                                       GFP_KERNEL);
592                 if (control_req == NULL)
593                         return -ENOMEM;
594 
595                 /* setup packet is '21 09 0200 0001 0008' */
596                 control_req->bRequestType = 0x21;
597                 control_req->bRequest = 0x09;
598                 control_req->wValue = cpu_to_le16(0x0200);
599                 control_req->wIndex = cpu_to_le16(0x0001);
600                 control_req->wLength = cpu_to_le16(0x0008);
601 
602                 /* control pipe is endpoint 0x00 */
603                 pipe = usb_sndctrlpipe(ictx->usbdev_intf0, 0);
604 
605                 /* build the control urb */
606                 usb_fill_control_urb(ictx->tx_urb, ictx->usbdev_intf0,
607                                      pipe, (unsigned char *)control_req,
608                                      ictx->usb_tx_buf,
609                                      sizeof(ictx->usb_tx_buf),
610                                      usb_tx_callback, ictx);
611                 ictx->tx_urb->actual_length = 0;
612         }
613 
614         init_completion(&ictx->tx.finished);
615         ictx->tx.busy = true;
616         smp_rmb(); /* ensure later readers know we're busy */
617 
618         retval = usb_submit_urb(ictx->tx_urb, GFP_KERNEL);
619         if (retval) {
620                 ictx->tx.busy = false;
621                 smp_rmb(); /* ensure later readers know we're not busy */
622                 pr_err_ratelimited("error submitting urb(%d)\n", retval);
623         } else {
624                 /* Wait for transmission to complete (or abort) */
625                 mutex_unlock(&ictx->lock);
626                 retval = wait_for_completion_interruptible(
627                                 &ictx->tx.finished);
628                 if (retval) {
629                         usb_kill_urb(ictx->tx_urb);
630                         pr_err_ratelimited("task interrupted\n");
631                 }
632                 mutex_lock(&ictx->lock);
633 
634                 retval = ictx->tx.status;
635                 if (retval)
636                         pr_err_ratelimited("packet tx failed (%d)\n", retval);
637         }
638 
639         kfree(control_req);
640 
641         /*
642          * Induce a mandatory delay before returning, as otherwise,
643          * send_packet can get called so rapidly as to overwhelm the device,
644          * particularly on faster systems and/or those with quirky usb.
645          */
646         timeout = msecs_to_jiffies(ictx->send_packet_delay);
647         set_current_state(TASK_INTERRUPTIBLE);
648         schedule_timeout(timeout);
649 
650         return retval;
651 }
652 
653 /**
654  * Sends an associate packet to the iMON 2.4G.
655  *
656  * This might not be such a good idea, since it has an id collision with
657  * some versions of the "IR & VFD" combo. The only way to determine if it
658  * is an RF version is to look at the product description string. (Which
659  * we currently do not fetch).
660  */
661 static int send_associate_24g(struct imon_context *ictx)
662 {
663         int retval;
664         const unsigned char packet[8] = { 0x01, 0x00, 0x00, 0x00,
665                                           0x00, 0x00, 0x00, 0x20 };
666 
667         if (!ictx) {
668                 pr_err("no context for device\n");
669                 return -ENODEV;
670         }
671 
672         if (!ictx->dev_present_intf0) {
673                 pr_err("no iMON device present\n");
674                 return -ENODEV;
675         }
676 
677         memcpy(ictx->usb_tx_buf, packet, sizeof(packet));
678         retval = send_packet(ictx);
679 
680         return retval;
681 }
682 
683 /**
684  * Sends packets to setup and show clock on iMON display
685  *
686  * Arguments: year - last 2 digits of year, month - 1..12,
687  * day - 1..31, dow - day of the week (0-Sun...6-Sat),
688  * hour - 0..23, minute - 0..59, second - 0..59
689  */
690 static int send_set_imon_clock(struct imon_context *ictx,
691                                unsigned int year, unsigned int month,
692                                unsigned int day, unsigned int dow,
693                                unsigned int hour, unsigned int minute,
694                                unsigned int second)
695 {
696         unsigned char clock_enable_pkt[IMON_CLOCK_ENABLE_PACKETS][8];
697         int retval = 0;
698         int i;
699 
700         if (!ictx) {
701                 pr_err("no context for device\n");
702                 return -ENODEV;
703         }
704 
705         switch (ictx->display_type) {
706         case IMON_DISPLAY_TYPE_LCD:
707                 clock_enable_pkt[0][0] = 0x80;
708                 clock_enable_pkt[0][1] = year;
709                 clock_enable_pkt[0][2] = month-1;
710                 clock_enable_pkt[0][3] = day;
711                 clock_enable_pkt[0][4] = hour;
712                 clock_enable_pkt[0][5] = minute;
713                 clock_enable_pkt[0][6] = second;
714 
715                 clock_enable_pkt[1][0] = 0x80;
716                 clock_enable_pkt[1][1] = 0;
717                 clock_enable_pkt[1][2] = 0;
718                 clock_enable_pkt[1][3] = 0;
719                 clock_enable_pkt[1][4] = 0;
720                 clock_enable_pkt[1][5] = 0;
721                 clock_enable_pkt[1][6] = 0;
722 
723                 if (ictx->product == 0xffdc) {
724                         clock_enable_pkt[0][7] = 0x50;
725                         clock_enable_pkt[1][7] = 0x51;
726                 } else {
727                         clock_enable_pkt[0][7] = 0x88;
728                         clock_enable_pkt[1][7] = 0x8a;
729                 }
730 
731                 break;
732 
733         case IMON_DISPLAY_TYPE_VFD:
734                 clock_enable_pkt[0][0] = year;
735                 clock_enable_pkt[0][1] = month-1;
736                 clock_enable_pkt[0][2] = day;
737                 clock_enable_pkt[0][3] = dow;
738                 clock_enable_pkt[0][4] = hour;
739                 clock_enable_pkt[0][5] = minute;
740                 clock_enable_pkt[0][6] = second;
741                 clock_enable_pkt[0][7] = 0x40;
742 
743                 clock_enable_pkt[1][0] = 0;
744                 clock_enable_pkt[1][1] = 0;
745                 clock_enable_pkt[1][2] = 1;
746                 clock_enable_pkt[1][3] = 0;
747                 clock_enable_pkt[1][4] = 0;
748                 clock_enable_pkt[1][5] = 0;
749                 clock_enable_pkt[1][6] = 0;
750                 clock_enable_pkt[1][7] = 0x42;
751 
752                 break;
753 
754         default:
755                 return -ENODEV;
756         }
757 
758         for (i = 0; i < IMON_CLOCK_ENABLE_PACKETS; i++) {
759                 memcpy(ictx->usb_tx_buf, clock_enable_pkt[i], 8);
760                 retval = send_packet(ictx);
761                 if (retval) {
762                         pr_err("send_packet failed for packet %d\n", i);
763                         break;
764                 }
765         }
766 
767         return retval;
768 }
769 
770 /**
771  * These are the sysfs functions to handle the association on the iMON 2.4G LT.
772  */
773 static ssize_t show_associate_remote(struct device *d,
774                                      struct device_attribute *attr,
775                                      char *buf)
776 {
777         struct imon_context *ictx = dev_get_drvdata(d);
778 
779         if (!ictx)
780                 return -ENODEV;
781 
782         mutex_lock(&ictx->lock);
783         if (ictx->rf_isassociating)
784                 strcpy(buf, "associating\n");
785         else
786                 strcpy(buf, "closed\n");
787 
788         dev_info(d, "Visit http://www.lirc.org/html/imon-24g.html for "
789                  "instructions on how to associate your iMON 2.4G DT/LT "
790                  "remote\n");
791         mutex_unlock(&ictx->lock);
792         return strlen(buf);
793 }
794 
795 static ssize_t store_associate_remote(struct device *d,
796                                       struct device_attribute *attr,
797                                       const char *buf, size_t count)
798 {
799         struct imon_context *ictx;
800 
801         ictx = dev_get_drvdata(d);
802 
803         if (!ictx)
804                 return -ENODEV;
805 
806         mutex_lock(&ictx->lock);
807         ictx->rf_isassociating = true;
808         send_associate_24g(ictx);
809         mutex_unlock(&ictx->lock);
810 
811         return count;
812 }
813 
814 /**
815  * sysfs functions to control internal imon clock
816  */
817 static ssize_t show_imon_clock(struct device *d,
818                                struct device_attribute *attr, char *buf)
819 {
820         struct imon_context *ictx = dev_get_drvdata(d);
821         size_t len;
822 
823         if (!ictx)
824                 return -ENODEV;
825 
826         mutex_lock(&ictx->lock);
827 
828         if (!ictx->display_supported) {
829                 len = snprintf(buf, PAGE_SIZE, "Not supported.");
830         } else {
831                 len = snprintf(buf, PAGE_SIZE,
832                         "To set the clock on your iMON display:\n"
833                         "# date \"+%%y %%m %%d %%w %%H %%M %%S\" > imon_clock\n"
834                         "%s", ictx->display_isopen ?
835                         "\nNOTE: imon device must be closed\n" : "");
836         }
837 
838         mutex_unlock(&ictx->lock);
839 
840         return len;
841 }
842 
843 static ssize_t store_imon_clock(struct device *d,
844                                 struct device_attribute *attr,
845                                 const char *buf, size_t count)
846 {
847         struct imon_context *ictx = dev_get_drvdata(d);
848         ssize_t retval;
849         unsigned int year, month, day, dow, hour, minute, second;
850 
851         if (!ictx)
852                 return -ENODEV;
853 
854         mutex_lock(&ictx->lock);
855 
856         if (!ictx->display_supported) {
857                 retval = -ENODEV;
858                 goto exit;
859         } else if (ictx->display_isopen) {
860                 retval = -EBUSY;
861                 goto exit;
862         }
863 
864         if (sscanf(buf, "%u %u %u %u %u %u %u", &year, &month, &day, &dow,
865                    &hour, &minute, &second) != 7) {
866                 retval = -EINVAL;
867                 goto exit;
868         }
869 
870         if ((month < 1 || month > 12) ||
871             (day < 1 || day > 31) || (dow > 6) ||
872             (hour > 23) || (minute > 59) || (second > 59)) {
873                 retval = -EINVAL;
874                 goto exit;
875         }
876 
877         retval = send_set_imon_clock(ictx, year, month, day, dow,
878                                      hour, minute, second);
879         if (retval)
880                 goto exit;
881 
882         retval = count;
883 exit:
884         mutex_unlock(&ictx->lock);
885 
886         return retval;
887 }
888 
889 
890 static DEVICE_ATTR(imon_clock, S_IWUSR | S_IRUGO, show_imon_clock,
891                    store_imon_clock);
892 
893 static DEVICE_ATTR(associate_remote, S_IWUSR | S_IRUGO, show_associate_remote,
894                    store_associate_remote);
895 
896 static struct attribute *imon_display_sysfs_entries[] = {
897         &dev_attr_imon_clock.attr,
898         NULL
899 };
900 
901 static struct attribute_group imon_display_attr_group = {
902         .attrs = imon_display_sysfs_entries
903 };
904 
905 static struct attribute *imon_rf_sysfs_entries[] = {
906         &dev_attr_associate_remote.attr,
907         NULL
908 };
909 
910 static struct attribute_group imon_rf_attr_group = {
911         .attrs = imon_rf_sysfs_entries
912 };
913 
914 /**
915  * Writes data to the VFD.  The iMON VFD is 2x16 characters
916  * and requires data in 5 consecutive USB interrupt packets,
917  * each packet but the last carrying 7 bytes.
918  *
919  * I don't know if the VFD board supports features such as
920  * scrolling, clearing rows, blanking, etc. so at
921  * the caller must provide a full screen of data.  If fewer
922  * than 32 bytes are provided spaces will be appended to
923  * generate a full screen.
924  */
925 static ssize_t vfd_write(struct file *file, const char __user *buf,
926                          size_t n_bytes, loff_t *pos)
927 {
928         int i;
929         int offset;
930         int seq;
931         int retval = 0;
932         struct imon_context *ictx;
933         const unsigned char vfd_packet6[] = {
934                 0x01, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF };
935 
936         ictx = file->private_data;
937         if (!ictx) {
938                 pr_err_ratelimited("no context for device\n");
939                 return -ENODEV;
940         }
941 
942         mutex_lock(&ictx->lock);
943 
944         if (!ictx->dev_present_intf0) {
945                 pr_err_ratelimited("no iMON device present\n");
946                 retval = -ENODEV;
947                 goto exit;
948         }
949 
950         if (n_bytes <= 0 || n_bytes > 32) {
951                 pr_err_ratelimited("invalid payload size\n");
952                 retval = -EINVAL;
953                 goto exit;
954         }
955 
956         if (copy_from_user(ictx->tx.data_buf, buf, n_bytes)) {
957                 retval = -EFAULT;
958                 goto exit;
959         }
960 
961         /* Pad with spaces */
962         for (i = n_bytes; i < 32; ++i)
963                 ictx->tx.data_buf[i] = ' ';
964 
965         for (i = 32; i < 35; ++i)
966                 ictx->tx.data_buf[i] = 0xFF;
967 
968         offset = 0;
969         seq = 0;
970 
971         do {
972                 memcpy(ictx->usb_tx_buf, ictx->tx.data_buf + offset, 7);
973                 ictx->usb_tx_buf[7] = (unsigned char) seq;
974 
975                 retval = send_packet(ictx);
976                 if (retval) {
977                         pr_err_ratelimited("send packet #%d failed\n", seq / 2);
978                         goto exit;
979                 } else {
980                         seq += 2;
981                         offset += 7;
982                 }
983 
984         } while (offset < 35);
985 
986         /* Send packet #6 */
987         memcpy(ictx->usb_tx_buf, &vfd_packet6, sizeof(vfd_packet6));
988         ictx->usb_tx_buf[7] = (unsigned char) seq;
989         retval = send_packet(ictx);
990         if (retval)
991                 pr_err_ratelimited("send packet #%d failed\n", seq / 2);
992 
993 exit:
994         mutex_unlock(&ictx->lock);
995 
996         return (!retval) ? n_bytes : retval;
997 }
998 
999 /**
1000  * Writes data to the LCD.  The iMON OEM LCD screen expects 8-byte
1001  * packets. We accept data as 16 hexadecimal digits, followed by a
1002  * newline (to make it easy to drive the device from a command-line
1003  * -- even though the actual binary data is a bit complicated).
1004  *
1005  * The device itself is not a "traditional" text-mode display. It's
1006  * actually a 16x96 pixel bitmap display. That means if you want to
1007  * display text, you've got to have your own "font" and translate the
1008  * text into bitmaps for display. This is really flexible (you can
1009  * display whatever diacritics you need, and so on), but it's also
1010  * a lot more complicated than most LCDs...
1011  */
1012 static ssize_t lcd_write(struct file *file, const char __user *buf,
1013                          size_t n_bytes, loff_t *pos)
1014 {
1015         int retval = 0;
1016         struct imon_context *ictx;
1017 
1018         ictx = file->private_data;
1019         if (!ictx) {
1020                 pr_err_ratelimited("no context for device\n");
1021                 return -ENODEV;
1022         }
1023 
1024         mutex_lock(&ictx->lock);
1025 
1026         if (!ictx->display_supported) {
1027                 pr_err_ratelimited("no iMON display present\n");
1028                 retval = -ENODEV;
1029                 goto exit;
1030         }
1031 
1032         if (n_bytes != 8) {
1033                 pr_err_ratelimited("invalid payload size: %d (expected 8)\n",
1034                                    (int)n_bytes);
1035                 retval = -EINVAL;
1036                 goto exit;
1037         }
1038 
1039         if (copy_from_user(ictx->usb_tx_buf, buf, 8)) {
1040                 retval = -EFAULT;
1041                 goto exit;
1042         }
1043 
1044         retval = send_packet(ictx);
1045         if (retval) {
1046                 pr_err_ratelimited("send packet failed!\n");
1047                 goto exit;
1048         } else {
1049                 dev_dbg(ictx->dev, "%s: write %d bytes to LCD\n",
1050                         __func__, (int) n_bytes);
1051         }
1052 exit:
1053         mutex_unlock(&ictx->lock);
1054         return (!retval) ? n_bytes : retval;
1055 }
1056 
1057 /**
1058  * Callback function for USB core API: transmit data
1059  */
1060 static void usb_tx_callback(struct urb *urb)
1061 {
1062         struct imon_context *ictx;
1063 
1064         if (!urb)
1065                 return;
1066         ictx = (struct imon_context *)urb->context;
1067         if (!ictx)
1068                 return;
1069 
1070         ictx->tx.status = urb->status;
1071 
1072         /* notify waiters that write has finished */
1073         ictx->tx.busy = false;
1074         smp_rmb(); /* ensure later readers know we're not busy */
1075         complete(&ictx->tx.finished);
1076 }
1077 
1078 /**
1079  * report touchscreen input
1080  */
1081 static void imon_touch_display_timeout(unsigned long data)
1082 {
1083         struct imon_context *ictx = (struct imon_context *)data;
1084 
1085         if (ictx->display_type != IMON_DISPLAY_TYPE_VGA)
1086                 return;
1087 
1088         input_report_abs(ictx->touch, ABS_X, ictx->touch_x);
1089         input_report_abs(ictx->touch, ABS_Y, ictx->touch_y);
1090         input_report_key(ictx->touch, BTN_TOUCH, 0x00);
1091         input_sync(ictx->touch);
1092 }
1093 
1094 /**
1095  * iMON IR receivers support two different signal sets -- those used by
1096  * the iMON remotes, and those used by the Windows MCE remotes (which is
1097  * really just RC-6), but only one or the other at a time, as the signals
1098  * are decoded onboard the receiver.
1099  *
1100  * This function gets called two different ways, one way is from
1101  * rc_register_device, for initial protocol selection/setup, and the other is
1102  * via a userspace-initiated protocol change request, either by direct sysfs
1103  * prodding or by something like ir-keytable. In the rc_register_device case,
1104  * the imon context lock is already held, but when initiated from userspace,
1105  * it is not, so we must acquire it prior to calling send_packet, which
1106  * requires that the lock is held.
1107  */
1108 static int imon_ir_change_protocol(struct rc_dev *rc, u64 *rc_type)
1109 {
1110         int retval;
1111         struct imon_context *ictx = rc->priv;
1112         struct device *dev = ictx->dev;
1113         bool unlock = false;
1114         unsigned char ir_proto_packet[] = {
1115                 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x86 };
1116 
1117         if (*rc_type && !(*rc_type & rc->allowed_protocols))
1118                 dev_warn(dev, "Looks like you're trying to use an IR protocol "
1119                          "this device does not support\n");
1120 
1121         if (*rc_type & RC_BIT_RC6_MCE) {
1122                 dev_dbg(dev, "Configuring IR receiver for MCE protocol\n");
1123                 ir_proto_packet[0] = 0x01;
1124                 *rc_type = RC_BIT_RC6_MCE;
1125         } else if (*rc_type & RC_BIT_OTHER) {
1126                 dev_dbg(dev, "Configuring IR receiver for iMON protocol\n");
1127                 if (!pad_stabilize)
1128                         dev_dbg(dev, "PAD stabilize functionality disabled\n");
1129                 /* ir_proto_packet[0] = 0x00; // already the default */
1130                 *rc_type = RC_BIT_OTHER;
1131         } else {
1132                 dev_warn(dev, "Unsupported IR protocol specified, overriding "
1133                          "to iMON IR protocol\n");
1134                 if (!pad_stabilize)
1135                         dev_dbg(dev, "PAD stabilize functionality disabled\n");
1136                 /* ir_proto_packet[0] = 0x00; // already the default */
1137                 *rc_type = RC_BIT_OTHER;
1138         }
1139 
1140         memcpy(ictx->usb_tx_buf, &ir_proto_packet, sizeof(ir_proto_packet));
1141 
1142         if (!mutex_is_locked(&ictx->lock)) {
1143                 unlock = true;
1144                 mutex_lock(&ictx->lock);
1145         }
1146 
1147         retval = send_packet(ictx);
1148         if (retval)
1149                 goto out;
1150 
1151         ictx->rc_type = *rc_type;
1152         ictx->pad_mouse = false;
1153 
1154 out:
1155         if (unlock)
1156                 mutex_unlock(&ictx->lock);
1157 
1158         return retval;
1159 }
1160 
1161 static inline int tv2int(const struct timeval *a, const struct timeval *b)
1162 {
1163         int usecs = 0;
1164         int sec   = 0;
1165 
1166         if (b->tv_usec > a->tv_usec) {
1167                 usecs = 1000000;
1168                 sec--;
1169         }
1170 
1171         usecs += a->tv_usec - b->tv_usec;
1172 
1173         sec += a->tv_sec - b->tv_sec;
1174         sec *= 1000;
1175         usecs /= 1000;
1176         sec += usecs;
1177 
1178         if (sec < 0)
1179                 sec = 1000;
1180 
1181         return sec;
1182 }
1183 
1184 /**
1185  * The directional pad behaves a bit differently, depending on whether this is
1186  * one of the older ffdc devices or a newer device. Newer devices appear to
1187  * have a higher resolution matrix for more precise mouse movement, but it
1188  * makes things overly sensitive in keyboard mode, so we do some interesting
1189  * contortions to make it less touchy. Older devices run through the same
1190  * routine with shorter timeout and a smaller threshold.
1191  */
1192 static int stabilize(int a, int b, u16 timeout, u16 threshold)
1193 {
1194         struct timeval ct;
1195         static struct timeval prev_time = {0, 0};
1196         static struct timeval hit_time  = {0, 0};
1197         static int x, y, prev_result, hits;
1198         int result = 0;
1199         int msec, msec_hit;
1200 
1201         do_gettimeofday(&ct);
1202         msec = tv2int(&ct, &prev_time);
1203         msec_hit = tv2int(&ct, &hit_time);
1204 
1205         if (msec > 100) {
1206                 x = 0;
1207                 y = 0;
1208                 hits = 0;
1209         }
1210 
1211         x += a;
1212         y += b;
1213 
1214         prev_time = ct;
1215 
1216         if (abs(x) > threshold || abs(y) > threshold) {
1217                 if (abs(y) > abs(x))
1218                         result = (y > 0) ? 0x7F : 0x80;
1219                 else
1220                         result = (x > 0) ? 0x7F00 : 0x8000;
1221 
1222                 x = 0;
1223                 y = 0;
1224 
1225                 if (result == prev_result) {
1226                         hits++;
1227 
1228                         if (hits > 3) {
1229                                 switch (result) {
1230                                 case 0x7F:
1231                                         y = 17 * threshold / 30;
1232                                         break;
1233                                 case 0x80:
1234                                         y -= 17 * threshold / 30;
1235                                         break;
1236                                 case 0x7F00:
1237                                         x = 17 * threshold / 30;
1238                                         break;
1239                                 case 0x8000:
1240                                         x -= 17 * threshold / 30;
1241                                         break;
1242                                 }
1243                         }
1244 
1245                         if (hits == 2 && msec_hit < timeout) {
1246                                 result = 0;
1247                                 hits = 1;
1248                         }
1249                 } else {
1250                         prev_result = result;
1251                         hits = 1;
1252                         hit_time = ct;
1253                 }
1254         }
1255 
1256         return result;
1257 }
1258 
1259 static u32 imon_remote_key_lookup(struct imon_context *ictx, u32 scancode)
1260 {
1261         u32 keycode;
1262         u32 release;
1263         bool is_release_code = false;
1264 
1265         /* Look for the initial press of a button */
1266         keycode = rc_g_keycode_from_table(ictx->rdev, scancode);
1267         ictx->rc_toggle = 0x0;
1268         ictx->rc_scancode = scancode;
1269 
1270         /* Look for the release of a button */
1271         if (keycode == KEY_RESERVED) {
1272                 release = scancode & ~0x4000;
1273                 keycode = rc_g_keycode_from_table(ictx->rdev, release);
1274                 if (keycode != KEY_RESERVED)
1275                         is_release_code = true;
1276         }
1277 
1278         ictx->release_code = is_release_code;
1279 
1280         return keycode;
1281 }
1282 
1283 static u32 imon_mce_key_lookup(struct imon_context *ictx, u32 scancode)
1284 {
1285         u32 keycode;
1286 
1287 #define MCE_KEY_MASK 0x7000
1288 #define MCE_TOGGLE_BIT 0x8000
1289 
1290         /*
1291          * On some receivers, mce keys decode to 0x8000f04xx and 0x8000f84xx
1292          * (the toggle bit flipping between alternating key presses), while
1293          * on other receivers, we see 0x8000f74xx and 0x8000ff4xx. To keep
1294          * the table trim, we always or in the bits to look up 0x8000ff4xx,
1295          * but we can't or them into all codes, as some keys are decoded in
1296          * a different way w/o the same use of the toggle bit...
1297          */
1298         if (scancode & 0x80000000)
1299                 scancode = scancode | MCE_KEY_MASK | MCE_TOGGLE_BIT;
1300 
1301         ictx->rc_scancode = scancode;
1302         keycode = rc_g_keycode_from_table(ictx->rdev, scancode);
1303 
1304         /* not used in mce mode, but make sure we know its false */
1305         ictx->release_code = false;
1306 
1307         return keycode;
1308 }
1309 
1310 static u32 imon_panel_key_lookup(struct imon_context *ictx, u64 code)
1311 {
1312         int i;
1313         u32 keycode = KEY_RESERVED;
1314         struct imon_panel_key_table *key_table = ictx->dev_descr->key_table;
1315 
1316         for (i = 0; key_table[i].hw_code != 0; i++) {
1317                 if (key_table[i].hw_code == (code | 0xffee)) {
1318                         keycode = key_table[i].keycode;
1319                         break;
1320                 }
1321         }
1322         ictx->release_code = false;
1323         return keycode;
1324 }
1325 
1326 static bool imon_mouse_event(struct imon_context *ictx,
1327                              unsigned char *buf, int len)
1328 {
1329         signed char rel_x = 0x00, rel_y = 0x00;
1330         u8 right_shift = 1;
1331         bool mouse_input = true;
1332         int dir = 0;
1333         unsigned long flags;
1334 
1335         spin_lock_irqsave(&ictx->kc_lock, flags);
1336 
1337         /* newer iMON device PAD or mouse button */
1338         if (ictx->product != 0xffdc && (buf[0] & 0x01) && len == 5) {
1339                 rel_x = buf[2];
1340                 rel_y = buf[3];
1341                 right_shift = 1;
1342         /* 0xffdc iMON PAD or mouse button input */
1343         } else if (ictx->product == 0xffdc && (buf[0] & 0x40) &&
1344                         !((buf[1] & 0x01) || ((buf[1] >> 2) & 0x01))) {
1345                 rel_x = (buf[1] & 0x08) | (buf[1] & 0x10) >> 2 |
1346                         (buf[1] & 0x20) >> 4 | (buf[1] & 0x40) >> 6;
1347                 if (buf[0] & 0x02)
1348                         rel_x |= ~0x0f;
1349                 rel_x = rel_x + rel_x / 2;
1350                 rel_y = (buf[2] & 0x08) | (buf[2] & 0x10) >> 2 |
1351                         (buf[2] & 0x20) >> 4 | (buf[2] & 0x40) >> 6;
1352                 if (buf[0] & 0x01)
1353                         rel_y |= ~0x0f;
1354                 rel_y = rel_y + rel_y / 2;
1355                 right_shift = 2;
1356         /* some ffdc devices decode mouse buttons differently... */
1357         } else if (ictx->product == 0xffdc && (buf[0] == 0x68)) {
1358                 right_shift = 2;
1359         /* ch+/- buttons, which we use for an emulated scroll wheel */
1360         } else if (ictx->kc == KEY_CHANNELUP && (buf[2] & 0x40) != 0x40) {
1361                 dir = 1;
1362         } else if (ictx->kc == KEY_CHANNELDOWN && (buf[2] & 0x40) != 0x40) {
1363                 dir = -1;
1364         } else
1365                 mouse_input = false;
1366 
1367         spin_unlock_irqrestore(&ictx->kc_lock, flags);
1368 
1369         if (mouse_input) {
1370                 dev_dbg(ictx->dev, "sending mouse data via input subsystem\n");
1371 
1372                 if (dir) {
1373                         input_report_rel(ictx->idev, REL_WHEEL, dir);
1374                 } else if (rel_x || rel_y) {
1375                         input_report_rel(ictx->idev, REL_X, rel_x);
1376                         input_report_rel(ictx->idev, REL_Y, rel_y);
1377                 } else {
1378                         input_report_key(ictx->idev, BTN_LEFT, buf[1] & 0x1);
1379                         input_report_key(ictx->idev, BTN_RIGHT,
1380                                          buf[1] >> right_shift & 0x1);
1381                 }
1382                 input_sync(ictx->idev);
1383                 spin_lock_irqsave(&ictx->kc_lock, flags);
1384                 ictx->last_keycode = ictx->kc;
1385                 spin_unlock_irqrestore(&ictx->kc_lock, flags);
1386         }
1387 
1388         return mouse_input;
1389 }
1390 
1391 static void imon_touch_event(struct imon_context *ictx, unsigned char *buf)
1392 {
1393         mod_timer(&ictx->ttimer, jiffies + TOUCH_TIMEOUT);
1394         ictx->touch_x = (buf[0] << 4) | (buf[1] >> 4);
1395         ictx->touch_y = 0xfff - ((buf[2] << 4) | (buf[1] & 0xf));
1396         input_report_abs(ictx->touch, ABS_X, ictx->touch_x);
1397         input_report_abs(ictx->touch, ABS_Y, ictx->touch_y);
1398         input_report_key(ictx->touch, BTN_TOUCH, 0x01);
1399         input_sync(ictx->touch);
1400 }
1401 
1402 static void imon_pad_to_keys(struct imon_context *ictx, unsigned char *buf)
1403 {
1404         int dir = 0;
1405         signed char rel_x = 0x00, rel_y = 0x00;
1406         u16 timeout, threshold;
1407         u32 scancode = KEY_RESERVED;
1408         unsigned long flags;
1409 
1410         /*
1411          * The imon directional pad functions more like a touchpad. Bytes 3 & 4
1412          * contain a position coordinate (x,y), with each component ranging
1413          * from -14 to 14. We want to down-sample this to only 4 discrete values
1414          * for up/down/left/right arrow keys. Also, when you get too close to
1415          * diagonals, it has a tendency to jump back and forth, so lets try to
1416          * ignore when they get too close.
1417          */
1418         if (ictx->product != 0xffdc) {
1419                 /* first, pad to 8 bytes so it conforms with everything else */
1420                 buf[5] = buf[6] = buf[7] = 0;
1421                 timeout = 500;  /* in msecs */
1422                 /* (2*threshold) x (2*threshold) square */
1423                 threshold = pad_thresh ? pad_thresh : 28;
1424                 rel_x = buf[2];
1425                 rel_y = buf[3];
1426 
1427                 if (ictx->rc_type == RC_BIT_OTHER && pad_stabilize) {
1428                         if ((buf[1] == 0) && ((rel_x != 0) || (rel_y != 0))) {
1429                                 dir = stabilize((int)rel_x, (int)rel_y,
1430                                                 timeout, threshold);
1431                                 if (!dir) {
1432                                         spin_lock_irqsave(&ictx->kc_lock,
1433                                                           flags);
1434                                         ictx->kc = KEY_UNKNOWN;
1435                                         spin_unlock_irqrestore(&ictx->kc_lock,
1436                                                                flags);
1437                                         return;
1438                                 }
1439                                 buf[2] = dir & 0xFF;
1440                                 buf[3] = (dir >> 8) & 0xFF;
1441                                 scancode = be32_to_cpu(*((__be32 *)buf));
1442                         }
1443                 } else {
1444                         /*
1445                          * Hack alert: instead of using keycodes, we have
1446                          * to use hard-coded scancodes here...
1447                          */
1448                         if (abs(rel_y) > abs(rel_x)) {
1449                                 buf[2] = (rel_y > 0) ? 0x7F : 0x80;
1450                                 buf[3] = 0;
1451                                 if (rel_y > 0)
1452                                         scancode = 0x01007f00; /* KEY_DOWN */
1453                                 else
1454                                         scancode = 0x01008000; /* KEY_UP */
1455                         } else {
1456                                 buf[2] = 0;
1457                                 buf[3] = (rel_x > 0) ? 0x7F : 0x80;
1458                                 if (rel_x > 0)
1459                                         scancode = 0x0100007f; /* KEY_RIGHT */
1460                                 else
1461                                         scancode = 0x01000080; /* KEY_LEFT */
1462                         }
1463                 }
1464 
1465         /*
1466          * Handle on-board decoded pad events for e.g. older VFD/iMON-Pad
1467          * device (15c2:ffdc). The remote generates various codes from
1468          * 0x68nnnnB7 to 0x6AnnnnB7, the left mouse button generates
1469          * 0x688301b7 and the right one 0x688481b7. All other keys generate
1470          * 0x2nnnnnnn. Position coordinate is encoded in buf[1] and buf[2] with
1471          * reversed endianness. Extract direction from buffer, rotate endianness,
1472          * adjust sign and feed the values into stabilize(). The resulting codes
1473          * will be 0x01008000, 0x01007F00, which match the newer devices.
1474          */
1475         } else {
1476                 timeout = 10;   /* in msecs */
1477                 /* (2*threshold) x (2*threshold) square */
1478                 threshold = pad_thresh ? pad_thresh : 15;
1479 
1480                 /* buf[1] is x */
1481                 rel_x = (buf[1] & 0x08) | (buf[1] & 0x10) >> 2 |
1482                         (buf[1] & 0x20) >> 4 | (buf[1] & 0x40) >> 6;
1483                 if (buf[0] & 0x02)
1484                         rel_x |= ~0x10+1;
1485                 /* buf[2] is y */
1486                 rel_y = (buf[2] & 0x08) | (buf[2] & 0x10) >> 2 |
1487                         (buf[2] & 0x20) >> 4 | (buf[2] & 0x40) >> 6;
1488                 if (buf[0] & 0x01)
1489                         rel_y |= ~0x10+1;
1490 
1491                 buf[0] = 0x01;
1492                 buf[1] = buf[4] = buf[5] = buf[6] = buf[7] = 0;
1493 
1494                 if (ictx->rc_type == RC_BIT_OTHER && pad_stabilize) {
1495                         dir = stabilize((int)rel_x, (int)rel_y,
1496                                         timeout, threshold);
1497                         if (!dir) {
1498                                 spin_lock_irqsave(&ictx->kc_lock, flags);
1499                                 ictx->kc = KEY_UNKNOWN;
1500                                 spin_unlock_irqrestore(&ictx->kc_lock, flags);
1501                                 return;
1502                         }
1503                         buf[2] = dir & 0xFF;
1504                         buf[3] = (dir >> 8) & 0xFF;
1505                         scancode = be32_to_cpu(*((__be32 *)buf));
1506                 } else {
1507                         /*
1508                          * Hack alert: instead of using keycodes, we have
1509                          * to use hard-coded scancodes here...
1510                          */
1511                         if (abs(rel_y) > abs(rel_x)) {
1512                                 buf[2] = (rel_y > 0) ? 0x7F : 0x80;
1513                                 buf[3] = 0;
1514                                 if (rel_y > 0)
1515                                         scancode = 0x01007f00; /* KEY_DOWN */
1516                                 else
1517                                         scancode = 0x01008000; /* KEY_UP */
1518                         } else {
1519                                 buf[2] = 0;
1520                                 buf[3] = (rel_x > 0) ? 0x7F : 0x80;
1521                                 if (rel_x > 0)
1522                                         scancode = 0x0100007f; /* KEY_RIGHT */
1523                                 else
1524                                         scancode = 0x01000080; /* KEY_LEFT */
1525                         }
1526                 }
1527         }
1528 
1529         if (scancode) {
1530                 spin_lock_irqsave(&ictx->kc_lock, flags);
1531                 ictx->kc = imon_remote_key_lookup(ictx, scancode);
1532                 spin_unlock_irqrestore(&ictx->kc_lock, flags);
1533         }
1534 }
1535 
1536 /**
1537  * figure out if these is a press or a release. We don't actually
1538  * care about repeats, as those will be auto-generated within the IR
1539  * subsystem for repeating scancodes.
1540  */
1541 static int imon_parse_press_type(struct imon_context *ictx,
1542                                  unsigned char *buf, u8 ktype)
1543 {
1544         int press_type = 0;
1545         unsigned long flags;
1546 
1547         spin_lock_irqsave(&ictx->kc_lock, flags);
1548 
1549         /* key release of 0x02XXXXXX key */
1550         if (ictx->kc == KEY_RESERVED && buf[0] == 0x02 && buf[3] == 0x00)
1551                 ictx->kc = ictx->last_keycode;
1552 
1553         /* mouse button release on (some) 0xffdc devices */
1554         else if (ictx->kc == KEY_RESERVED && buf[0] == 0x68 && buf[1] == 0x82 &&
1555                  buf[2] == 0x81 && buf[3] == 0xb7)
1556                 ictx->kc = ictx->last_keycode;
1557 
1558         /* mouse button release on (some other) 0xffdc devices */
1559         else if (ictx->kc == KEY_RESERVED && buf[0] == 0x01 && buf[1] == 0x00 &&
1560                  buf[2] == 0x81 && buf[3] == 0xb7)
1561                 ictx->kc = ictx->last_keycode;
1562 
1563         /* mce-specific button handling, no keyup events */
1564         else if (ktype == IMON_KEY_MCE) {
1565                 ictx->rc_toggle = buf[2];
1566                 press_type = 1;
1567 
1568         /* incoherent or irrelevant data */
1569         } else if (ictx->kc == KEY_RESERVED)
1570                 press_type = -EINVAL;
1571 
1572         /* key release of 0xXXXXXXb7 key */
1573         else if (ictx->release_code)
1574                 press_type = 0;
1575 
1576         /* this is a button press */
1577         else
1578                 press_type = 1;
1579 
1580         spin_unlock_irqrestore(&ictx->kc_lock, flags);
1581 
1582         return press_type;
1583 }
1584 
1585 /**
1586  * Process the incoming packet
1587  */
1588 static void imon_incoming_packet(struct imon_context *ictx,
1589                                  struct urb *urb, int intf)
1590 {
1591         int len = urb->actual_length;
1592         unsigned char *buf = urb->transfer_buffer;
1593         struct device *dev = ictx->dev;
1594         unsigned long flags;
1595         u32 kc;
1596         int i;
1597         u64 scancode;
1598         int press_type = 0;
1599         int msec;
1600         struct timeval t;
1601         static struct timeval prev_time = { 0, 0 };
1602         u8 ktype;
1603 
1604         /* filter out junk data on the older 0xffdc imon devices */
1605         if ((buf[0] == 0xff) && (buf[1] == 0xff) && (buf[2] == 0xff))
1606                 return;
1607 
1608         /* Figure out what key was pressed */
1609         if (len == 8 && buf[7] == 0xee) {
1610                 scancode = be64_to_cpu(*((__be64 *)buf));
1611                 ktype = IMON_KEY_PANEL;
1612                 kc = imon_panel_key_lookup(ictx, scancode);
1613                 ictx->release_code = false;
1614         } else {
1615                 scancode = be32_to_cpu(*((__be32 *)buf));
1616                 if (ictx->rc_type == RC_BIT_RC6_MCE) {
1617                         ktype = IMON_KEY_IMON;
1618                         if (buf[0] == 0x80)
1619                                 ktype = IMON_KEY_MCE;
1620                         kc = imon_mce_key_lookup(ictx, scancode);
1621                 } else {
1622                         ktype = IMON_KEY_IMON;
1623                         kc = imon_remote_key_lookup(ictx, scancode);
1624                 }
1625         }
1626 
1627         spin_lock_irqsave(&ictx->kc_lock, flags);
1628         /* keyboard/mouse mode toggle button */
1629         if (kc == KEY_KEYBOARD && !ictx->release_code) {
1630                 ictx->last_keycode = kc;
1631                 if (!nomouse) {
1632                         ictx->pad_mouse = ~(ictx->pad_mouse) & 0x1;
1633                         dev_dbg(dev, "toggling to %s mode\n",
1634                                 ictx->pad_mouse ? "mouse" : "keyboard");
1635                         spin_unlock_irqrestore(&ictx->kc_lock, flags);
1636                         return;
1637                 } else {
1638                         ictx->pad_mouse = false;
1639                         dev_dbg(dev, "mouse mode disabled, passing key value\n");
1640                 }
1641         }
1642 
1643         ictx->kc = kc;
1644         spin_unlock_irqrestore(&ictx->kc_lock, flags);
1645 
1646         /* send touchscreen events through input subsystem if touchpad data */
1647         if (ictx->display_type == IMON_DISPLAY_TYPE_VGA && len == 8 &&
1648             buf[7] == 0x86) {
1649                 imon_touch_event(ictx, buf);
1650                 return;
1651 
1652         /* look for mouse events with pad in mouse mode */
1653         } else if (ictx->pad_mouse) {
1654                 if (imon_mouse_event(ictx, buf, len))
1655                         return;
1656         }
1657 
1658         /* Now for some special handling to convert pad input to arrow keys */
1659         if (((len == 5) && (buf[0] == 0x01) && (buf[4] == 0x00)) ||
1660             ((len == 8) && (buf[0] & 0x40) &&
1661              !(buf[1] & 0x1 || buf[1] >> 2 & 0x1))) {
1662                 len = 8;
1663                 imon_pad_to_keys(ictx, buf);
1664         }
1665 
1666         if (debug) {
1667                 printk(KERN_INFO "intf%d decoded packet: ", intf);
1668                 for (i = 0; i < len; ++i)
1669                         printk("%02x ", buf[i]);
1670                 printk("\n");
1671         }
1672 
1673         press_type = imon_parse_press_type(ictx, buf, ktype);
1674         if (press_type < 0)
1675                 goto not_input_data;
1676 
1677         if (ktype != IMON_KEY_PANEL) {
1678                 if (press_type == 0)
1679                         rc_keyup(ictx->rdev);
1680                 else {
1681                         if (ictx->rc_type == RC_BIT_RC6_MCE ||
1682                             ictx->rc_type == RC_BIT_OTHER)
1683                                 rc_keydown(ictx->rdev,
1684                                            ictx->rc_type == RC_BIT_RC6_MCE ? RC_TYPE_RC6_MCE : RC_TYPE_OTHER,
1685                                            ictx->rc_scancode, ictx->rc_toggle);
1686                         spin_lock_irqsave(&ictx->kc_lock, flags);
1687                         ictx->last_keycode = ictx->kc;
1688                         spin_unlock_irqrestore(&ictx->kc_lock, flags);
1689                 }
1690                 return;
1691         }
1692 
1693         /* Only panel type events left to process now */
1694         spin_lock_irqsave(&ictx->kc_lock, flags);
1695 
1696         do_gettimeofday(&t);
1697         /* KEY_MUTE repeats from knob need to be suppressed */
1698         if (ictx->kc == KEY_MUTE && ictx->kc == ictx->last_keycode) {
1699                 msec = tv2int(&t, &prev_time);
1700                 if (msec < ictx->idev->rep[REP_DELAY]) {
1701                         spin_unlock_irqrestore(&ictx->kc_lock, flags);
1702                         return;
1703                 }
1704         }
1705         prev_time = t;
1706         kc = ictx->kc;
1707 
1708         spin_unlock_irqrestore(&ictx->kc_lock, flags);
1709 
1710         input_report_key(ictx->idev, kc, press_type);
1711         input_sync(ictx->idev);
1712 
1713         /* panel keys don't generate a release */
1714         input_report_key(ictx->idev, kc, 0);
1715         input_sync(ictx->idev);
1716 
1717         spin_lock_irqsave(&ictx->kc_lock, flags);
1718         ictx->last_keycode = kc;
1719         spin_unlock_irqrestore(&ictx->kc_lock, flags);
1720 
1721         return;
1722 
1723 not_input_data:
1724         if (len != 8) {
1725                 dev_warn(dev, "imon %s: invalid incoming packet "
1726                          "size (len = %d, intf%d)\n", __func__, len, intf);
1727                 return;
1728         }
1729 
1730         /* iMON 2.4G associate frame */
1731         if (buf[0] == 0x00 &&
1732             buf[2] == 0xFF &&                           /* REFID */
1733             buf[3] == 0xFF &&
1734             buf[4] == 0xFF &&
1735             buf[5] == 0xFF &&                           /* iMON 2.4G */
1736            ((buf[6] == 0x4E && buf[7] == 0xDF) ||       /* LT */
1737             (buf[6] == 0x5E && buf[7] == 0xDF))) {      /* DT */
1738                 dev_warn(dev, "%s: remote associated refid=%02X\n",
1739                          __func__, buf[1]);
1740                 ictx->rf_isassociating = false;
1741         }
1742 }
1743 
1744 /**
1745  * Callback function for USB core API: receive data
1746  */
1747 static void usb_rx_callback_intf0(struct urb *urb)
1748 {
1749         struct imon_context *ictx;
1750         int intfnum = 0;
1751 
1752         if (!urb)
1753                 return;
1754 
1755         ictx = (struct imon_context *)urb->context;
1756         if (!ictx)
1757                 return;
1758 
1759         /*
1760          * if we get a callback before we're done configuring the hardware, we
1761          * can't yet process the data, as there's nowhere to send it, but we
1762          * still need to submit a new rx URB to avoid wedging the hardware
1763          */
1764         if (!ictx->dev_present_intf0)
1765                 goto out;
1766 
1767         switch (urb->status) {
1768         case -ENOENT:           /* usbcore unlink successful! */
1769                 return;
1770 
1771         case -ESHUTDOWN:        /* transport endpoint was shut down */
1772                 break;
1773 
1774         case 0:
1775                 imon_incoming_packet(ictx, urb, intfnum);
1776                 break;
1777 
1778         default:
1779                 dev_warn(ictx->dev, "imon %s: status(%d): ignored\n",
1780                          __func__, urb->status);
1781                 break;
1782         }
1783 
1784 out:
1785         usb_submit_urb(ictx->rx_urb_intf0, GFP_ATOMIC);
1786 }
1787 
1788 static void usb_rx_callback_intf1(struct urb *urb)
1789 {
1790         struct imon_context *ictx;
1791         int intfnum = 1;
1792 
1793         if (!urb)
1794                 return;
1795 
1796         ictx = (struct imon_context *)urb->context;
1797         if (!ictx)
1798                 return;
1799 
1800         /*
1801          * if we get a callback before we're done configuring the hardware, we
1802          * can't yet process the data, as there's nowhere to send it, but we
1803          * still need to submit a new rx URB to avoid wedging the hardware
1804          */
1805         if (!ictx->dev_present_intf1)
1806                 goto out;
1807 
1808         switch (urb->status) {
1809         case -ENOENT:           /* usbcore unlink successful! */
1810                 return;
1811 
1812         case -ESHUTDOWN:        /* transport endpoint was shut down */
1813                 break;
1814 
1815         case 0:
1816                 imon_incoming_packet(ictx, urb, intfnum);
1817                 break;
1818 
1819         default:
1820                 dev_warn(ictx->dev, "imon %s: status(%d): ignored\n",
1821                          __func__, urb->status);
1822                 break;
1823         }
1824 
1825 out:
1826         usb_submit_urb(ictx->rx_urb_intf1, GFP_ATOMIC);
1827 }
1828 
1829 /*
1830  * The 0x15c2:0xffdc device ID was used for umpteen different imon
1831  * devices, and all of them constantly spew interrupts, even when there
1832  * is no actual data to report. However, byte 6 of this buffer looks like
1833  * its unique across device variants, so we're trying to key off that to
1834  * figure out which display type (if any) and what IR protocol the device
1835  * actually supports. These devices have their IR protocol hard-coded into
1836  * their firmware, they can't be changed on the fly like the newer hardware.
1837  */
1838 static void imon_get_ffdc_type(struct imon_context *ictx)
1839 {
1840         u8 ffdc_cfg_byte = ictx->usb_rx_buf[6];
1841         u8 detected_display_type = IMON_DISPLAY_TYPE_NONE;
1842         u64 allowed_protos = RC_BIT_OTHER;
1843 
1844         switch (ffdc_cfg_byte) {
1845         /* iMON Knob, no display, iMON IR + vol knob */
1846         case 0x21:
1847                 dev_info(ictx->dev, "0xffdc iMON Knob, iMON IR");
1848                 ictx->display_supported = false;
1849                 break;
1850         /* iMON 2.4G LT (usb stick), no display, iMON RF */
1851         case 0x4e:
1852                 dev_info(ictx->dev, "0xffdc iMON 2.4G LT, iMON RF");
1853                 ictx->display_supported = false;
1854                 ictx->rf_device = true;
1855                 break;
1856         /* iMON VFD, no IR (does have vol knob tho) */
1857         case 0x35:
1858                 dev_info(ictx->dev, "0xffdc iMON VFD + knob, no IR");
1859                 detected_display_type = IMON_DISPLAY_TYPE_VFD;
1860                 break;
1861         /* iMON VFD, iMON IR */
1862         case 0x24:
1863         case 0x85:
1864                 dev_info(ictx->dev, "0xffdc iMON VFD, iMON IR");
1865                 detected_display_type = IMON_DISPLAY_TYPE_VFD;
1866                 break;
1867         /* iMON VFD, MCE IR */
1868         case 0x46:
1869         case 0x7e:
1870         case 0x9e:
1871                 dev_info(ictx->dev, "0xffdc iMON VFD, MCE IR");
1872                 detected_display_type = IMON_DISPLAY_TYPE_VFD;
1873                 allowed_protos = RC_BIT_RC6_MCE;
1874                 break;
1875         /* iMON LCD, MCE IR */
1876         case 0x9f:
1877                 dev_info(ictx->dev, "0xffdc iMON LCD, MCE IR");
1878                 detected_display_type = IMON_DISPLAY_TYPE_LCD;
1879                 allowed_protos = RC_BIT_RC6_MCE;
1880                 break;
1881         default:
1882                 dev_info(ictx->dev, "Unknown 0xffdc device, "
1883                          "defaulting to VFD and iMON IR");
1884                 detected_display_type = IMON_DISPLAY_TYPE_VFD;
1885                 /* We don't know which one it is, allow user to set the
1886                  * RC6 one from userspace if OTHER wasn't correct. */
1887                 allowed_protos |= RC_BIT_RC6_MCE;
1888                 break;
1889         }
1890 
1891         printk(KERN_CONT " (id 0x%02x)\n", ffdc_cfg_byte);
1892 
1893         ictx->display_type = detected_display_type;
1894         ictx->rc_type = allowed_protos;
1895 }
1896 
1897 static void imon_set_display_type(struct imon_context *ictx)
1898 {
1899         u8 configured_display_type = IMON_DISPLAY_TYPE_VFD;
1900 
1901         /*
1902          * Try to auto-detect the type of display if the user hasn't set
1903          * it by hand via the display_type modparam. Default is VFD.
1904          */
1905 
1906         if (display_type == IMON_DISPLAY_TYPE_AUTO) {
1907                 switch (ictx->product) {
1908                 case 0xffdc:
1909                         /* set in imon_get_ffdc_type() */
1910                         configured_display_type = ictx->display_type;
1911                         break;
1912                 case 0x0034:
1913                 case 0x0035:
1914                         configured_display_type = IMON_DISPLAY_TYPE_VGA;
1915                         break;
1916                 case 0x0038:
1917                 case 0x0039:
1918                 case 0x0045:
1919                         configured_display_type = IMON_DISPLAY_TYPE_LCD;
1920                         break;
1921                 case 0x003c:
1922                 case 0x0041:
1923                 case 0x0042:
1924                 case 0x0043:
1925                         configured_display_type = IMON_DISPLAY_TYPE_NONE;
1926                         ictx->display_supported = false;
1927                         break;
1928                 case 0x0036:
1929                 case 0x0044:
1930                 default:
1931                         configured_display_type = IMON_DISPLAY_TYPE_VFD;
1932                         break;
1933                 }
1934         } else {
1935                 configured_display_type = display_type;
1936                 if (display_type == IMON_DISPLAY_TYPE_NONE)
1937                         ictx->display_supported = false;
1938                 else
1939                         ictx->display_supported = true;
1940                 dev_info(ictx->dev, "%s: overriding display type to %d via "
1941                          "modparam\n", __func__, display_type);
1942         }
1943 
1944         ictx->display_type = configured_display_type;
1945 }
1946 
1947 static struct rc_dev *imon_init_rdev(struct imon_context *ictx)
1948 {
1949         struct rc_dev *rdev;
1950         int ret;
1951         const unsigned char fp_packet[] = { 0x40, 0x00, 0x00, 0x00,
1952                                             0x00, 0x00, 0x00, 0x88 };
1953 
1954         rdev = rc_allocate_device();
1955         if (!rdev) {
1956                 dev_err(ictx->dev, "remote control dev allocation failed\n");
1957                 goto out;
1958         }
1959 
1960         snprintf(ictx->name_rdev, sizeof(ictx->name_rdev),
1961                  "iMON Remote (%04x:%04x)", ictx->vendor, ictx->product);
1962         usb_make_path(ictx->usbdev_intf0, ictx->phys_rdev,
1963                       sizeof(ictx->phys_rdev));
1964         strlcat(ictx->phys_rdev, "/input0", sizeof(ictx->phys_rdev));
1965 
1966         rdev->input_name = ictx->name_rdev;
1967         rdev->input_phys = ictx->phys_rdev;
1968         usb_to_input_id(ictx->usbdev_intf0, &rdev->input_id);
1969         rdev->dev.parent = ictx->dev;
1970 
1971         rdev->priv = ictx;
1972         rdev->driver_type = RC_DRIVER_SCANCODE;
1973         rdev->allowed_protocols = RC_BIT_OTHER | RC_BIT_RC6_MCE; /* iMON PAD or MCE */
1974         rdev->change_protocol = imon_ir_change_protocol;
1975         rdev->driver_name = MOD_NAME;
1976 
1977         /* Enable front-panel buttons and/or knobs */
1978         memcpy(ictx->usb_tx_buf, &fp_packet, sizeof(fp_packet));
1979         ret = send_packet(ictx);
1980         /* Not fatal, but warn about it */
1981         if (ret)
1982                 dev_info(ictx->dev, "panel buttons/knobs setup failed\n");
1983 
1984         if (ictx->product == 0xffdc) {
1985                 imon_get_ffdc_type(ictx);
1986                 rdev->allowed_protocols = ictx->rc_type;
1987         }
1988 
1989         imon_set_display_type(ictx);
1990 
1991         if (ictx->rc_type == RC_BIT_RC6_MCE)
1992                 rdev->map_name = RC_MAP_IMON_MCE;
1993         else
1994                 rdev->map_name = RC_MAP_IMON_PAD;
1995 
1996         ret = rc_register_device(rdev);
1997         if (ret < 0) {
1998                 dev_err(ictx->dev, "remote input dev register failed\n");
1999                 goto out;
2000         }
2001 
2002         return rdev;
2003 
2004 out:
2005         rc_free_device(rdev);
2006         return NULL;
2007 }
2008 
2009 static struct input_dev *imon_init_idev(struct imon_context *ictx)
2010 {
2011         struct imon_panel_key_table *key_table = ictx->dev_descr->key_table;
2012         struct input_dev *idev;
2013         int ret, i;
2014 
2015         idev = input_allocate_device();
2016         if (!idev)
2017                 goto out;
2018 
2019         snprintf(ictx->name_idev, sizeof(ictx->name_idev),
2020                  "iMON Panel, Knob and Mouse(%04x:%04x)",
2021                  ictx->vendor, ictx->product);
2022         idev->name = ictx->name_idev;
2023 
2024         usb_make_path(ictx->usbdev_intf0, ictx->phys_idev,
2025                       sizeof(ictx->phys_idev));
2026         strlcat(ictx->phys_idev, "/input1", sizeof(ictx->phys_idev));
2027         idev->phys = ictx->phys_idev;
2028 
2029         idev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP) | BIT_MASK(EV_REL);
2030 
2031         idev->keybit[BIT_WORD(BTN_MOUSE)] =
2032                 BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_RIGHT);
2033         idev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y) |
2034                 BIT_MASK(REL_WHEEL);
2035 
2036         /* panel and/or knob code support */
2037         for (i = 0; key_table[i].hw_code != 0; i++) {
2038                 u32 kc = key_table[i].keycode;
2039                 __set_bit(kc, idev->keybit);
2040         }
2041 
2042         usb_to_input_id(ictx->usbdev_intf0, &idev->id);
2043         idev->dev.parent = ictx->dev;
2044         input_set_drvdata(idev, ictx);
2045 
2046         ret = input_register_device(idev);
2047         if (ret < 0) {
2048                 dev_err(ictx->dev, "input dev register failed\n");
2049                 goto out;
2050         }
2051 
2052         return idev;
2053 
2054 out:
2055         input_free_device(idev);
2056         return NULL;
2057 }
2058 
2059 static struct input_dev *imon_init_touch(struct imon_context *ictx)
2060 {
2061         struct input_dev *touch;
2062         int ret;
2063 
2064         touch = input_allocate_device();
2065         if (!touch)
2066                 goto touch_alloc_failed;
2067 
2068         snprintf(ictx->name_touch, sizeof(ictx->name_touch),
2069                  "iMON USB Touchscreen (%04x:%04x)",
2070                  ictx->vendor, ictx->product);
2071         touch->name = ictx->name_touch;
2072 
2073         usb_make_path(ictx->usbdev_intf1, ictx->phys_touch,
2074                       sizeof(ictx->phys_touch));
2075         strlcat(ictx->phys_touch, "/input2", sizeof(ictx->phys_touch));
2076         touch->phys = ictx->phys_touch;
2077 
2078         touch->evbit[0] =
2079                 BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
2080         touch->keybit[BIT_WORD(BTN_TOUCH)] =
2081                 BIT_MASK(BTN_TOUCH);
2082         input_set_abs_params(touch, ABS_X,
2083                              0x00, 0xfff, 0, 0);
2084         input_set_abs_params(touch, ABS_Y,
2085                              0x00, 0xfff, 0, 0);
2086 
2087         input_set_drvdata(touch, ictx);
2088 
2089         usb_to_input_id(ictx->usbdev_intf1, &touch->id);
2090         touch->dev.parent = ictx->dev;
2091         ret = input_register_device(touch);
2092         if (ret <  0) {
2093                 dev_info(ictx->dev, "touchscreen input dev register failed\n");
2094                 goto touch_register_failed;
2095         }
2096 
2097         return touch;
2098 
2099 touch_register_failed:
2100         input_free_device(touch);
2101 
2102 touch_alloc_failed:
2103         return NULL;
2104 }
2105 
2106 static bool imon_find_endpoints(struct imon_context *ictx,
2107                                 struct usb_host_interface *iface_desc)
2108 {
2109         struct usb_endpoint_descriptor *ep;
2110         struct usb_endpoint_descriptor *rx_endpoint = NULL;
2111         struct usb_endpoint_descriptor *tx_endpoint = NULL;
2112         int ifnum = iface_desc->desc.bInterfaceNumber;
2113         int num_endpts = iface_desc->desc.bNumEndpoints;
2114         int i, ep_dir, ep_type;
2115         bool ir_ep_found = false;
2116         bool display_ep_found = false;
2117         bool tx_control = false;
2118 
2119         /*
2120          * Scan the endpoint list and set:
2121          *      first input endpoint = IR endpoint
2122          *      first output endpoint = display endpoint
2123          */
2124         for (i = 0; i < num_endpts && !(ir_ep_found && display_ep_found); ++i) {
2125                 ep = &iface_desc->endpoint[i].desc;
2126                 ep_dir = ep->bEndpointAddress & USB_ENDPOINT_DIR_MASK;
2127                 ep_type = usb_endpoint_type(ep);
2128 
2129                 if (!ir_ep_found && ep_dir == USB_DIR_IN &&
2130                     ep_type == USB_ENDPOINT_XFER_INT) {
2131 
2132                         rx_endpoint = ep;
2133                         ir_ep_found = true;
2134                         dev_dbg(ictx->dev, "%s: found IR endpoint\n", __func__);
2135 
2136                 } else if (!display_ep_found && ep_dir == USB_DIR_OUT &&
2137                            ep_type == USB_ENDPOINT_XFER_INT) {
2138                         tx_endpoint = ep;
2139                         display_ep_found = true;
2140                         dev_dbg(ictx->dev, "%s: found display endpoint\n", __func__);
2141                 }
2142         }
2143 
2144         if (ifnum == 0) {
2145                 ictx->rx_endpoint_intf0 = rx_endpoint;
2146                 /*
2147                  * tx is used to send characters to lcd/vfd, associate RF
2148                  * remotes, set IR protocol, and maybe more...
2149                  */
2150                 ictx->tx_endpoint = tx_endpoint;
2151         } else {
2152                 ictx->rx_endpoint_intf1 = rx_endpoint;
2153         }
2154 
2155         /*
2156          * If we didn't find a display endpoint, this is probably one of the
2157          * newer iMON devices that use control urb instead of interrupt
2158          */
2159         if (!display_ep_found) {
2160                 tx_control = true;
2161                 display_ep_found = true;
2162                 dev_dbg(ictx->dev, "%s: device uses control endpoint, not "
2163                         "interface OUT endpoint\n", __func__);
2164         }
2165 
2166         /*
2167          * Some iMON receivers have no display. Unfortunately, it seems
2168          * that SoundGraph recycles device IDs between devices both with
2169          * and without... :\
2170          */
2171         if (ictx->display_type == IMON_DISPLAY_TYPE_NONE) {
2172                 display_ep_found = false;
2173                 dev_dbg(ictx->dev, "%s: device has no display\n", __func__);
2174         }
2175 
2176         /*
2177          * iMON Touch devices have a VGA touchscreen, but no "display", as
2178          * that refers to e.g. /dev/lcd0 (a character device LCD or VFD).
2179          */
2180         if (ictx->display_type == IMON_DISPLAY_TYPE_VGA) {
2181                 display_ep_found = false;
2182                 dev_dbg(ictx->dev, "%s: iMON Touch device found\n", __func__);
2183         }
2184 
2185         /* Input endpoint is mandatory */
2186         if (!ir_ep_found)
2187                 pr_err("no valid input (IR) endpoint found\n");
2188 
2189         ictx->tx_control = tx_control;
2190 
2191         if (display_ep_found)
2192                 ictx->display_supported = true;
2193 
2194         return ir_ep_found;
2195 
2196 }
2197 
2198 static struct imon_context *imon_init_intf0(struct usb_interface *intf,
2199                                             const struct usb_device_id *id)
2200 {
2201         struct imon_context *ictx;
2202         struct urb *rx_urb;
2203         struct urb *tx_urb;
2204         struct device *dev = &intf->dev;
2205         struct usb_host_interface *iface_desc;
2206         int ret = -ENOMEM;
2207 
2208         ictx = kzalloc(sizeof(struct imon_context), GFP_KERNEL);
2209         if (!ictx) {
2210                 dev_err(dev, "%s: kzalloc failed for context", __func__);
2211                 goto exit;
2212         }
2213         rx_urb = usb_alloc_urb(0, GFP_KERNEL);
2214         if (!rx_urb) {
2215                 dev_err(dev, "%s: usb_alloc_urb failed for IR urb", __func__);
2216                 goto rx_urb_alloc_failed;
2217         }
2218         tx_urb = usb_alloc_urb(0, GFP_KERNEL);
2219         if (!tx_urb) {
2220                 dev_err(dev, "%s: usb_alloc_urb failed for display urb",
2221                         __func__);
2222                 goto tx_urb_alloc_failed;
2223         }
2224 
2225         mutex_init(&ictx->lock);
2226         spin_lock_init(&ictx->kc_lock);
2227 
2228         mutex_lock(&ictx->lock);
2229 
2230         ictx->dev = dev;
2231         ictx->usbdev_intf0 = usb_get_dev(interface_to_usbdev(intf));
2232         ictx->rx_urb_intf0 = rx_urb;
2233         ictx->tx_urb = tx_urb;
2234         ictx->rf_device = false;
2235 
2236         ictx->vendor  = le16_to_cpu(ictx->usbdev_intf0->descriptor.idVendor);
2237         ictx->product = le16_to_cpu(ictx->usbdev_intf0->descriptor.idProduct);
2238 
2239         /* save drive info for later accessing the panel/knob key table */
2240         ictx->dev_descr = (struct imon_usb_dev_descr *)id->driver_info;
2241         /* default send_packet delay is 5ms but some devices need more */
2242         ictx->send_packet_delay = ictx->dev_descr->flags &
2243                                   IMON_NEED_20MS_PKT_DELAY ? 20 : 5;
2244 
2245         ret = -ENODEV;
2246         iface_desc = intf->cur_altsetting;
2247         if (!imon_find_endpoints(ictx, iface_desc)) {
2248                 goto find_endpoint_failed;
2249         }
2250 
2251         usb_fill_int_urb(ictx->rx_urb_intf0, ictx->usbdev_intf0,
2252                 usb_rcvintpipe(ictx->usbdev_intf0,
2253                         ictx->rx_endpoint_intf0->bEndpointAddress),
2254                 ictx->usb_rx_buf, sizeof(ictx->usb_rx_buf),
2255                 usb_rx_callback_intf0, ictx,
2256                 ictx->rx_endpoint_intf0->bInterval);
2257 
2258         ret = usb_submit_urb(ictx->rx_urb_intf0, GFP_KERNEL);
2259         if (ret) {
2260                 pr_err("usb_submit_urb failed for intf0 (%d)\n", ret);
2261                 goto urb_submit_failed;
2262         }
2263 
2264         ictx->idev = imon_init_idev(ictx);
2265         if (!ictx->idev) {
2266                 dev_err(dev, "%s: input device setup failed\n", __func__);
2267                 goto idev_setup_failed;
2268         }
2269 
2270         ictx->rdev = imon_init_rdev(ictx);
2271         if (!ictx->rdev) {
2272                 dev_err(dev, "%s: rc device setup failed\n", __func__);
2273                 goto rdev_setup_failed;
2274         }
2275 
2276         ictx->dev_present_intf0 = true;
2277 
2278         mutex_unlock(&ictx->lock);
2279         return ictx;
2280 
2281 rdev_setup_failed:
2282         input_unregister_device(ictx->idev);
2283 idev_setup_failed:
2284         usb_kill_urb(ictx->rx_urb_intf0);
2285 urb_submit_failed:
2286 find_endpoint_failed:
2287         usb_put_dev(ictx->usbdev_intf0);
2288         mutex_unlock(&ictx->lock);
2289         usb_free_urb(tx_urb);
2290 tx_urb_alloc_failed:
2291         usb_free_urb(rx_urb);
2292 rx_urb_alloc_failed:
2293         kfree(ictx);
2294 exit:
2295         dev_err(dev, "unable to initialize intf0, err %d\n", ret);
2296 
2297         return NULL;
2298 }
2299 
2300 static struct imon_context *imon_init_intf1(struct usb_interface *intf,
2301                                             struct imon_context *ictx)
2302 {
2303         struct urb *rx_urb;
2304         struct usb_host_interface *iface_desc;
2305         int ret = -ENOMEM;
2306 
2307         rx_urb = usb_alloc_urb(0, GFP_KERNEL);
2308         if (!rx_urb) {
2309                 pr_err("usb_alloc_urb failed for IR urb\n");
2310                 goto rx_urb_alloc_failed;
2311         }
2312 
2313         mutex_lock(&ictx->lock);
2314 
2315         if (ictx->display_type == IMON_DISPLAY_TYPE_VGA) {
2316                 init_timer(&ictx->ttimer);
2317                 ictx->ttimer.data = (unsigned long)ictx;
2318                 ictx->ttimer.function = imon_touch_display_timeout;
2319         }
2320 
2321         ictx->usbdev_intf1 = usb_get_dev(interface_to_usbdev(intf));
2322         ictx->rx_urb_intf1 = rx_urb;
2323 
2324         ret = -ENODEV;
2325         iface_desc = intf->cur_altsetting;
2326         if (!imon_find_endpoints(ictx, iface_desc))
2327                 goto find_endpoint_failed;
2328 
2329         if (ictx->display_type == IMON_DISPLAY_TYPE_VGA) {
2330                 ictx->touch = imon_init_touch(ictx);
2331                 if (!ictx->touch)
2332                         goto touch_setup_failed;
2333         } else
2334                 ictx->touch = NULL;
2335 
2336         usb_fill_int_urb(ictx->rx_urb_intf1, ictx->usbdev_intf1,
2337                 usb_rcvintpipe(ictx->usbdev_intf1,
2338                         ictx->rx_endpoint_intf1->bEndpointAddress),
2339                 ictx->usb_rx_buf, sizeof(ictx->usb_rx_buf),
2340                 usb_rx_callback_intf1, ictx,
2341                 ictx->rx_endpoint_intf1->bInterval);
2342 
2343         ret = usb_submit_urb(ictx->rx_urb_intf1, GFP_KERNEL);
2344 
2345         if (ret) {
2346                 pr_err("usb_submit_urb failed for intf1 (%d)\n", ret);
2347                 goto urb_submit_failed;
2348         }
2349 
2350         ictx->dev_present_intf1 = true;
2351 
2352         mutex_unlock(&ictx->lock);
2353         return ictx;
2354 
2355 urb_submit_failed:
2356         if (ictx->touch)
2357                 input_unregister_device(ictx->touch);
2358 touch_setup_failed:
2359 find_endpoint_failed:
2360         usb_put_dev(ictx->usbdev_intf1);
2361         mutex_unlock(&ictx->lock);
2362         usb_free_urb(rx_urb);
2363 rx_urb_alloc_failed:
2364         dev_err(ictx->dev, "unable to initialize intf1, err %d\n", ret);
2365 
2366         return NULL;
2367 }
2368 
2369 static void imon_init_display(struct imon_context *ictx,
2370                               struct usb_interface *intf)
2371 {
2372         int ret;
2373 
2374         dev_dbg(ictx->dev, "Registering iMON display with sysfs\n");
2375 
2376         /* set up sysfs entry for built-in clock */
2377         ret = sysfs_create_group(&intf->dev.kobj, &imon_display_attr_group);
2378         if (ret)
2379                 dev_err(ictx->dev, "Could not create display sysfs "
2380                         "entries(%d)", ret);
2381 
2382         if (ictx->display_type == IMON_DISPLAY_TYPE_LCD)
2383                 ret = usb_register_dev(intf, &imon_lcd_class);
2384         else
2385                 ret = usb_register_dev(intf, &imon_vfd_class);
2386         if (ret)
2387                 /* Not a fatal error, so ignore */
2388                 dev_info(ictx->dev, "could not get a minor number for "
2389                          "display\n");
2390 
2391 }
2392 
2393 /**
2394  * Callback function for USB core API: Probe
2395  */
2396 static int imon_probe(struct usb_interface *interface,
2397                       const struct usb_device_id *id)
2398 {
2399         struct usb_device *usbdev = NULL;
2400         struct usb_host_interface *iface_desc = NULL;
2401         struct usb_interface *first_if;
2402         struct device *dev = &interface->dev;
2403         int ifnum, sysfs_err;
2404         int ret = 0;
2405         struct imon_context *ictx = NULL;
2406         struct imon_context *first_if_ctx = NULL;
2407         u16 vendor, product;
2408 
2409         usbdev     = usb_get_dev(interface_to_usbdev(interface));
2410         iface_desc = interface->cur_altsetting;
2411         ifnum      = iface_desc->desc.bInterfaceNumber;
2412         vendor     = le16_to_cpu(usbdev->descriptor.idVendor);
2413         product    = le16_to_cpu(usbdev->descriptor.idProduct);
2414 
2415         dev_dbg(dev, "%s: found iMON device (%04x:%04x, intf%d)\n",
2416                 __func__, vendor, product, ifnum);
2417 
2418         /* prevent races probing devices w/multiple interfaces */
2419         mutex_lock(&driver_lock);
2420 
2421         first_if = usb_ifnum_to_if(usbdev, 0);
2422         first_if_ctx = usb_get_intfdata(first_if);
2423 
2424         if (ifnum == 0) {
2425                 ictx = imon_init_intf0(interface, id);
2426                 if (!ictx) {
2427                         pr_err("failed to initialize context!\n");
2428                         ret = -ENODEV;
2429                         goto fail;
2430                 }
2431 
2432         } else {
2433                 /* this is the secondary interface on the device */
2434 
2435                 /* fail early if first intf failed to register */
2436                 if (!first_if_ctx) {
2437                         ret = -ENODEV;
2438                         goto fail;
2439                 }
2440 
2441                 ictx = imon_init_intf1(interface, first_if_ctx);
2442                 if (!ictx) {
2443                         pr_err("failed to attach to context!\n");
2444                         ret = -ENODEV;
2445                         goto fail;
2446                 }
2447 
2448         }
2449 
2450         usb_set_intfdata(interface, ictx);
2451 
2452         if (ifnum == 0) {
2453                 mutex_lock(&ictx->lock);
2454 
2455                 if (product == 0xffdc && ictx->rf_device) {
2456                         sysfs_err = sysfs_create_group(&interface->dev.kobj,
2457                                                        &imon_rf_attr_group);
2458                         if (sysfs_err)
2459                                 pr_err("Could not create RF sysfs entries(%d)\n",
2460                                        sysfs_err);
2461                 }
2462 
2463                 if (ictx->display_supported)
2464                         imon_init_display(ictx, interface);
2465 
2466                 mutex_unlock(&ictx->lock);
2467         }
2468 
2469         dev_info(dev, "iMON device (%04x:%04x, intf%d) on "
2470                  "usb<%d:%d> initialized\n", vendor, product, ifnum,
2471                  usbdev->bus->busnum, usbdev->devnum);
2472 
2473         mutex_unlock(&driver_lock);
2474         usb_put_dev(usbdev);
2475 
2476         return 0;
2477 
2478 fail:
2479         mutex_unlock(&driver_lock);
2480         usb_put_dev(usbdev);
2481         dev_err(dev, "unable to register, err %d\n", ret);
2482 
2483         return ret;
2484 }
2485 
2486 /**
2487  * Callback function for USB core API: disconnect
2488  */
2489 static void imon_disconnect(struct usb_interface *interface)
2490 {
2491         struct imon_context *ictx;
2492         struct device *dev;
2493         int ifnum;
2494 
2495         /* prevent races with multi-interface device probing and display_open */
2496         mutex_lock(&driver_lock);
2497 
2498         ictx = usb_get_intfdata(interface);
2499         dev = ictx->dev;
2500         ifnum = interface->cur_altsetting->desc.bInterfaceNumber;
2501 
2502         /*
2503          * sysfs_remove_group is safe to call even if sysfs_create_group
2504          * hasn't been called
2505          */
2506         sysfs_remove_group(&interface->dev.kobj, &imon_display_attr_group);
2507         sysfs_remove_group(&interface->dev.kobj, &imon_rf_attr_group);
2508 
2509         usb_set_intfdata(interface, NULL);
2510 
2511         /* Abort ongoing write */
2512         if (ictx->tx.busy) {
2513                 usb_kill_urb(ictx->tx_urb);
2514                 complete_all(&ictx->tx.finished);
2515         }
2516 
2517         if (ifnum == 0) {
2518                 ictx->dev_present_intf0 = false;
2519                 usb_kill_urb(ictx->rx_urb_intf0);
2520                 usb_put_dev(ictx->usbdev_intf0);
2521                 input_unregister_device(ictx->idev);
2522                 rc_unregister_device(ictx->rdev);
2523                 if (ictx->display_supported) {
2524                         if (ictx->display_type == IMON_DISPLAY_TYPE_LCD)
2525                                 usb_deregister_dev(interface, &imon_lcd_class);
2526                         else if (ictx->display_type == IMON_DISPLAY_TYPE_VFD)
2527                                 usb_deregister_dev(interface, &imon_vfd_class);
2528                 }
2529         } else {
2530                 ictx->dev_present_intf1 = false;
2531                 usb_kill_urb(ictx->rx_urb_intf1);
2532                 usb_put_dev(ictx->usbdev_intf1);
2533                 if (ictx->display_type == IMON_DISPLAY_TYPE_VGA) {
2534                         input_unregister_device(ictx->touch);
2535                         del_timer_sync(&ictx->ttimer);
2536                 }
2537         }
2538 
2539         if (!ictx->dev_present_intf0 && !ictx->dev_present_intf1)
2540                 free_imon_context(ictx);
2541 
2542         mutex_unlock(&driver_lock);
2543 
2544         dev_dbg(dev, "%s: iMON device (intf%d) disconnected\n",
2545                 __func__, ifnum);
2546 }
2547 
2548 static int imon_suspend(struct usb_interface *intf, pm_message_t message)
2549 {
2550         struct imon_context *ictx = usb_get_intfdata(intf);
2551         int ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
2552 
2553         if (ifnum == 0)
2554                 usb_kill_urb(ictx->rx_urb_intf0);
2555         else
2556                 usb_kill_urb(ictx->rx_urb_intf1);
2557 
2558         return 0;
2559 }
2560 
2561 static int imon_resume(struct usb_interface *intf)
2562 {
2563         int rc = 0;
2564         struct imon_context *ictx = usb_get_intfdata(intf);
2565         int ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
2566 
2567         if (ifnum == 0) {
2568                 usb_fill_int_urb(ictx->rx_urb_intf0, ictx->usbdev_intf0,
2569                         usb_rcvintpipe(ictx->usbdev_intf0,
2570                                 ictx->rx_endpoint_intf0->bEndpointAddress),
2571                         ictx->usb_rx_buf, sizeof(ictx->usb_rx_buf),
2572                         usb_rx_callback_intf0, ictx,
2573                         ictx->rx_endpoint_intf0->bInterval);
2574 
2575                 rc = usb_submit_urb(ictx->rx_urb_intf0, GFP_ATOMIC);
2576 
2577         } else {
2578                 usb_fill_int_urb(ictx->rx_urb_intf1, ictx->usbdev_intf1,
2579                         usb_rcvintpipe(ictx->usbdev_intf1,
2580                                 ictx->rx_endpoint_intf1->bEndpointAddress),
2581                         ictx->usb_rx_buf, sizeof(ictx->usb_rx_buf),
2582                         usb_rx_callback_intf1, ictx,
2583                         ictx->rx_endpoint_intf1->bInterval);
2584 
2585                 rc = usb_submit_urb(ictx->rx_urb_intf1, GFP_ATOMIC);
2586         }
2587 
2588         return rc;
2589 }
2590 
2591 module_usb_driver(imon_driver);
2592 

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