drivers/media/rc/imon.c

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This source file includes following definitions.
free_imon_context
display_open
display_close
send_packet
send_associate_24g
send_set_imon_clock
show_associate_remote
store_associate_remote
show_imon_clock
store_imon_clock
vfd_write
lcd_write
usb_tx_callback
imon_touch_display_timeout
imon_ir_change_protocol
stabilize
imon_remote_key_lookup
imon_mce_key_lookup
imon_panel_key_lookup
imon_mouse_event
imon_touch_event
imon_pad_to_keys
imon_parse_press_type
imon_incoming_packet
usb_rx_callback_intf0
usb_rx_callback_intf1
imon_get_ffdc_type
imon_set_display_type
imon_init_rdev
imon_init_idev
imon_init_touch
imon_find_endpoints
imon_init_intf0
imon_init_intf1
imon_init_display
imon_probe
imon_disconnect
imon_suspend
imon_resume
   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *   imon.c:    input and display driver for SoundGraph iMON IR/VFD/LCD
   4  *
   5  *   Copyright(C) 2010  Jarod Wilson <jarod@wilsonet.com>
   6  *   Portions based on the original lirc_imon driver,
   7  *      Copyright(C) 2004  Venky Raju(dev@venky.ws)
   8  *
   9  *   Huge thanks to R. Geoff Newbury for invaluable debugging on the
  10  *   0xffdc iMON devices, and for sending me one to hack on, without
  11  *   which the support for them wouldn't be nearly as good. Thanks
  12  *   also to the numerous 0xffdc device owners that tested auto-config
  13  *   support for me and provided debug dumps from their devices.
  14  */
  15 
  16 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
  17 
  18 #include <linux/errno.h>
  19 #include <linux/init.h>
  20 #include <linux/kernel.h>
  21 #include <linux/ktime.h>
  22 #include <linux/module.h>
  23 #include <linux/slab.h>
  24 #include <linux/uaccess.h>
  25 #include <linux/ratelimit.h>
  26 
  27 #include <linux/input.h>
  28 #include <linux/usb.h>
  29 #include <linux/usb/input.h>
  30 #include <media/rc-core.h>
  31 
  32 #include <linux/timer.h>
  33 
  34 #define MOD_AUTHOR      "Jarod Wilson <jarod@wilsonet.com>"
  35 #define MOD_DESC        "Driver for SoundGraph iMON MultiMedia IR/Display"
  36 #define MOD_NAME        "imon"
  37 #define MOD_VERSION     "0.9.4"
  38 
  39 #define DISPLAY_MINOR_BASE      144
  40 #define DEVICE_NAME     "lcd%d"
  41 
  42 #define BUF_CHUNK_SIZE  8
  43 #define BUF_SIZE        128
  44 
  45 #define BIT_DURATION    250     /* each bit received is 250us */
  46 
  47 #define IMON_CLOCK_ENABLE_PACKETS       2
  48 
  49 /*** P R O T O T Y P E S ***/
  50 
  51 /* USB Callback prototypes */
  52 static int imon_probe(struct usb_interface *interface,
  53                       const struct usb_device_id *id);
  54 static void imon_disconnect(struct usb_interface *interface);
  55 static void usb_rx_callback_intf0(struct urb *urb);
  56 static void usb_rx_callback_intf1(struct urb *urb);
  57 static void usb_tx_callback(struct urb *urb);
  58 
  59 /* suspend/resume support */
  60 static int imon_resume(struct usb_interface *intf);
  61 static int imon_suspend(struct usb_interface *intf, pm_message_t message);
  62 
  63 /* Display file_operations function prototypes */
  64 static int display_open(struct inode *inode, struct file *file);
  65 static int display_close(struct inode *inode, struct file *file);
  66 
  67 /* VFD write operation */
  68 static ssize_t vfd_write(struct file *file, const char __user *buf,
  69                          size_t n_bytes, loff_t *pos);
  70 
  71 /* LCD file_operations override function prototypes */
  72 static ssize_t lcd_write(struct file *file, const char __user *buf,
  73                          size_t n_bytes, loff_t *pos);
  74 
  75 /*** G L O B A L S ***/
  76 
  77 struct imon_panel_key_table {
  78         u64 hw_code;
  79         u32 keycode;
  80 };
  81 
  82 struct imon_usb_dev_descr {
  83         __u16 flags;
  84 #define IMON_NO_FLAGS 0
  85 #define IMON_NEED_20MS_PKT_DELAY 1
  86         struct imon_panel_key_table key_table[];
  87 };
  88 
  89 struct imon_context {
  90         struct device *dev;
  91         /* Newer devices have two interfaces */
  92         struct usb_device *usbdev_intf0;
  93         struct usb_device *usbdev_intf1;
  94 
  95         bool display_supported;         /* not all controllers do */
  96         bool display_isopen;            /* display port has been opened */
  97         bool rf_device;                 /* true if iMON 2.4G LT/DT RF device */
  98         bool rf_isassociating;          /* RF remote associating */
  99         bool dev_present_intf0;         /* USB device presence, interface 0 */
 100         bool dev_present_intf1;         /* USB device presence, interface 1 */
 101 
 102         struct mutex lock;              /* to lock this object */
 103         wait_queue_head_t remove_ok;    /* For unexpected USB disconnects */
 104 
 105         struct usb_endpoint_descriptor *rx_endpoint_intf0;
 106         struct usb_endpoint_descriptor *rx_endpoint_intf1;
 107         struct usb_endpoint_descriptor *tx_endpoint;
 108         struct urb *rx_urb_intf0;
 109         struct urb *rx_urb_intf1;
 110         struct urb *tx_urb;
 111         bool tx_control;
 112         unsigned char usb_rx_buf[8];
 113         unsigned char usb_tx_buf[8];
 114         unsigned int send_packet_delay;
 115 
 116         struct tx_t {
 117                 unsigned char data_buf[35];     /* user data buffer */
 118                 struct completion finished;     /* wait for write to finish */
 119                 bool busy;                      /* write in progress */
 120                 int status;                     /* status of tx completion */
 121         } tx;
 122 
 123         u16 vendor;                     /* usb vendor ID */
 124         u16 product;                    /* usb product ID */
 125 
 126         struct rc_dev *rdev;            /* rc-core device for remote */
 127         struct input_dev *idev;         /* input device for panel & IR mouse */
 128         struct input_dev *touch;        /* input device for touchscreen */
 129 
 130         spinlock_t kc_lock;             /* make sure we get keycodes right */
 131         u32 kc;                         /* current input keycode */
 132         u32 last_keycode;               /* last reported input keycode */
 133         u32 rc_scancode;                /* the computed remote scancode */
 134         u8 rc_toggle;                   /* the computed remote toggle bit */
 135         u64 rc_proto;                   /* iMON or MCE (RC6) IR protocol? */
 136         bool release_code;              /* some keys send a release code */
 137 
 138         u8 display_type;                /* store the display type */
 139         bool pad_mouse;                 /* toggle kbd(0)/mouse(1) mode */
 140 
 141         char name_rdev[128];            /* rc input device name */
 142         char phys_rdev[64];             /* rc input device phys path */
 143 
 144         char name_idev[128];            /* input device name */
 145         char phys_idev[64];             /* input device phys path */
 146 
 147         char name_touch[128];           /* touch screen name */
 148         char phys_touch[64];            /* touch screen phys path */
 149         struct timer_list ttimer;       /* touch screen timer */
 150         int touch_x;                    /* x coordinate on touchscreen */
 151         int touch_y;                    /* y coordinate on touchscreen */
 152         struct imon_usb_dev_descr *dev_descr; /* device description with key
 153                                                  table for front panels */
 154 };
 155 
 156 #define TOUCH_TIMEOUT   (HZ/30)
 157 
 158 /* vfd character device file operations */
 159 static const struct file_operations vfd_fops = {
 160         .owner          = THIS_MODULE,
 161         .open           = &display_open,
 162         .write          = &vfd_write,
 163         .release        = &display_close,
 164         .llseek         = noop_llseek,
 165 };
 166 
 167 /* lcd character device file operations */
 168 static const struct file_operations lcd_fops = {
 169         .owner          = THIS_MODULE,
 170         .open           = &display_open,
 171         .write          = &lcd_write,
 172         .release        = &display_close,
 173         .llseek         = noop_llseek,
 174 };
 175 
 176 enum {
 177         IMON_DISPLAY_TYPE_AUTO = 0,
 178         IMON_DISPLAY_TYPE_VFD  = 1,
 179         IMON_DISPLAY_TYPE_LCD  = 2,
 180         IMON_DISPLAY_TYPE_VGA  = 3,
 181         IMON_DISPLAY_TYPE_NONE = 4,
 182 };
 183 
 184 enum {
 185         IMON_KEY_IMON   = 0,
 186         IMON_KEY_MCE    = 1,
 187         IMON_KEY_PANEL  = 2,
 188 };
 189 
 190 static struct usb_class_driver imon_vfd_class = {
 191         .name           = DEVICE_NAME,
 192         .fops           = &vfd_fops,
 193         .minor_base     = DISPLAY_MINOR_BASE,
 194 };
 195 
 196 static struct usb_class_driver imon_lcd_class = {
 197         .name           = DEVICE_NAME,
 198         .fops           = &lcd_fops,
 199         .minor_base     = DISPLAY_MINOR_BASE,
 200 };
 201 
 202 /* imon receiver front panel/knob key table */
 203 static const struct imon_usb_dev_descr imon_default_table = {
 204         .flags = IMON_NO_FLAGS,
 205         .key_table = {
 206                 { 0x000000000f00ffeell, KEY_MEDIA }, /* Go */
 207                 { 0x000000001200ffeell, KEY_UP },
 208                 { 0x000000001300ffeell, KEY_DOWN },
 209                 { 0x000000001400ffeell, KEY_LEFT },
 210                 { 0x000000001500ffeell, KEY_RIGHT },
 211                 { 0x000000001600ffeell, KEY_ENTER },
 212                 { 0x000000001700ffeell, KEY_ESC },
 213                 { 0x000000001f00ffeell, KEY_AUDIO },
 214                 { 0x000000002000ffeell, KEY_VIDEO },
 215                 { 0x000000002100ffeell, KEY_CAMERA },
 216                 { 0x000000002700ffeell, KEY_DVD },
 217                 { 0x000000002300ffeell, KEY_TV },
 218                 { 0x000000002b00ffeell, KEY_EXIT },
 219                 { 0x000000002c00ffeell, KEY_SELECT },
 220                 { 0x000000002d00ffeell, KEY_MENU },
 221                 { 0x000000000500ffeell, KEY_PREVIOUS },
 222                 { 0x000000000700ffeell, KEY_REWIND },
 223                 { 0x000000000400ffeell, KEY_STOP },
 224                 { 0x000000003c00ffeell, KEY_PLAYPAUSE },
 225                 { 0x000000000800ffeell, KEY_FASTFORWARD },
 226                 { 0x000000000600ffeell, KEY_NEXT },
 227                 { 0x000000010000ffeell, KEY_RIGHT },
 228                 { 0x000001000000ffeell, KEY_LEFT },
 229                 { 0x000000003d00ffeell, KEY_SELECT },
 230                 { 0x000100000000ffeell, KEY_VOLUMEUP },
 231                 { 0x010000000000ffeell, KEY_VOLUMEDOWN },
 232                 { 0x000000000100ffeell, KEY_MUTE },
 233                 /* 0xffdc iMON MCE VFD */
 234                 { 0x00010000ffffffeell, KEY_VOLUMEUP },
 235                 { 0x01000000ffffffeell, KEY_VOLUMEDOWN },
 236                 { 0x00000001ffffffeell, KEY_MUTE },
 237                 { 0x0000000fffffffeell, KEY_MEDIA },
 238                 { 0x00000012ffffffeell, KEY_UP },
 239                 { 0x00000013ffffffeell, KEY_DOWN },
 240                 { 0x00000014ffffffeell, KEY_LEFT },
 241                 { 0x00000015ffffffeell, KEY_RIGHT },
 242                 { 0x00000016ffffffeell, KEY_ENTER },
 243                 { 0x00000017ffffffeell, KEY_ESC },
 244                 /* iMON Knob values */
 245                 { 0x000100ffffffffeell, KEY_VOLUMEUP },
 246                 { 0x010000ffffffffeell, KEY_VOLUMEDOWN },
 247                 { 0x000008ffffffffeell, KEY_MUTE },
 248                 { 0, KEY_RESERVED },
 249         }
 250 };
 251 
 252 static const struct imon_usb_dev_descr imon_OEM_VFD = {
 253         .flags = IMON_NEED_20MS_PKT_DELAY,
 254         .key_table = {
 255                 { 0x000000000f00ffeell, KEY_MEDIA }, /* Go */
 256                 { 0x000000001200ffeell, KEY_UP },
 257                 { 0x000000001300ffeell, KEY_DOWN },
 258                 { 0x000000001400ffeell, KEY_LEFT },
 259                 { 0x000000001500ffeell, KEY_RIGHT },
 260                 { 0x000000001600ffeell, KEY_ENTER },
 261                 { 0x000000001700ffeell, KEY_ESC },
 262                 { 0x000000001f00ffeell, KEY_AUDIO },
 263                 { 0x000000002b00ffeell, KEY_EXIT },
 264                 { 0x000000002c00ffeell, KEY_SELECT },
 265                 { 0x000000002d00ffeell, KEY_MENU },
 266                 { 0x000000000500ffeell, KEY_PREVIOUS },
 267                 { 0x000000000700ffeell, KEY_REWIND },
 268                 { 0x000000000400ffeell, KEY_STOP },
 269                 { 0x000000003c00ffeell, KEY_PLAYPAUSE },
 270                 { 0x000000000800ffeell, KEY_FASTFORWARD },
 271                 { 0x000000000600ffeell, KEY_NEXT },
 272                 { 0x000000010000ffeell, KEY_RIGHT },
 273                 { 0x000001000000ffeell, KEY_LEFT },
 274                 { 0x000000003d00ffeell, KEY_SELECT },
 275                 { 0x000100000000ffeell, KEY_VOLUMEUP },
 276                 { 0x010000000000ffeell, KEY_VOLUMEDOWN },
 277                 { 0x000000000100ffeell, KEY_MUTE },
 278                 /* 0xffdc iMON MCE VFD */
 279                 { 0x00010000ffffffeell, KEY_VOLUMEUP },
 280                 { 0x01000000ffffffeell, KEY_VOLUMEDOWN },
 281                 { 0x00000001ffffffeell, KEY_MUTE },
 282                 { 0x0000000fffffffeell, KEY_MEDIA },
 283                 { 0x00000012ffffffeell, KEY_UP },
 284                 { 0x00000013ffffffeell, KEY_DOWN },
 285                 { 0x00000014ffffffeell, KEY_LEFT },
 286                 { 0x00000015ffffffeell, KEY_RIGHT },
 287                 { 0x00000016ffffffeell, KEY_ENTER },
 288                 { 0x00000017ffffffeell, KEY_ESC },
 289                 /* iMON Knob values */
 290                 { 0x000100ffffffffeell, KEY_VOLUMEUP },
 291                 { 0x010000ffffffffeell, KEY_VOLUMEDOWN },
 292                 { 0x000008ffffffffeell, KEY_MUTE },
 293                 { 0, KEY_RESERVED },
 294         }
 295 };
 296 
 297 /* imon receiver front panel/knob key table for DH102*/
 298 static const struct imon_usb_dev_descr imon_DH102 = {
 299         .flags = IMON_NO_FLAGS,
 300         .key_table = {
 301                 { 0x000100000000ffeell, KEY_VOLUMEUP },
 302                 { 0x010000000000ffeell, KEY_VOLUMEDOWN },
 303                 { 0x000000010000ffeell, KEY_MUTE },
 304                 { 0x0000000f0000ffeell, KEY_MEDIA },
 305                 { 0x000000120000ffeell, KEY_UP },
 306                 { 0x000000130000ffeell, KEY_DOWN },
 307                 { 0x000000140000ffeell, KEY_LEFT },
 308                 { 0x000000150000ffeell, KEY_RIGHT },
 309                 { 0x000000160000ffeell, KEY_ENTER },
 310                 { 0x000000170000ffeell, KEY_ESC },
 311                 { 0x0000002b0000ffeell, KEY_EXIT },
 312                 { 0x0000002c0000ffeell, KEY_SELECT },
 313                 { 0x0000002d0000ffeell, KEY_MENU },
 314                 { 0, KEY_RESERVED }
 315         }
 316 };
 317 
 318 /*
 319  * USB Device ID for iMON USB Control Boards
 320  *
 321  * The Windows drivers contain 6 different inf files, more or less one for
 322  * each new device until the 0x0034-0x0046 devices, which all use the same
 323  * driver. Some of the devices in the 34-46 range haven't been definitively
 324  * identified yet. Early devices have either a TriGem Computer, Inc. or a
 325  * Samsung vendor ID (0x0aa8 and 0x04e8 respectively), while all later
 326  * devices use the SoundGraph vendor ID (0x15c2). This driver only supports
 327  * the ffdc and later devices, which do onboard decoding.
 328  */
 329 static const struct usb_device_id imon_usb_id_table[] = {
 330         /*
 331          * Several devices with this same device ID, all use iMON_PAD.inf
 332          * SoundGraph iMON PAD (IR & VFD)
 333          * SoundGraph iMON PAD (IR & LCD)
 334          * SoundGraph iMON Knob (IR only)
 335          */
 336         { USB_DEVICE(0x15c2, 0xffdc),
 337           .driver_info = (unsigned long)&imon_default_table },
 338 
 339         /*
 340          * Newer devices, all driven by the latest iMON Windows driver, full
 341          * list of device IDs extracted via 'strings Setup/data1.hdr |grep 15c2'
 342          * Need user input to fill in details on unknown devices.
 343          */
 344         /* SoundGraph iMON OEM Touch LCD (IR & 7" VGA LCD) */
 345         { USB_DEVICE(0x15c2, 0x0034),
 346           .driver_info = (unsigned long)&imon_DH102 },
 347         /* SoundGraph iMON OEM Touch LCD (IR & 4.3" VGA LCD) */
 348         { USB_DEVICE(0x15c2, 0x0035),
 349           .driver_info = (unsigned long)&imon_default_table},
 350         /* SoundGraph iMON OEM VFD (IR & VFD) */
 351         { USB_DEVICE(0x15c2, 0x0036),
 352           .driver_info = (unsigned long)&imon_OEM_VFD },
 353         /* device specifics unknown */
 354         { USB_DEVICE(0x15c2, 0x0037),
 355           .driver_info = (unsigned long)&imon_default_table},
 356         /* SoundGraph iMON OEM LCD (IR & LCD) */
 357         { USB_DEVICE(0x15c2, 0x0038),
 358           .driver_info = (unsigned long)&imon_default_table},
 359         /* SoundGraph iMON UltraBay (IR & LCD) */
 360         { USB_DEVICE(0x15c2, 0x0039),
 361           .driver_info = (unsigned long)&imon_default_table},
 362         /* device specifics unknown */
 363         { USB_DEVICE(0x15c2, 0x003a),
 364           .driver_info = (unsigned long)&imon_default_table},
 365         /* device specifics unknown */
 366         { USB_DEVICE(0x15c2, 0x003b),
 367           .driver_info = (unsigned long)&imon_default_table},
 368         /* SoundGraph iMON OEM Inside (IR only) */
 369         { USB_DEVICE(0x15c2, 0x003c),
 370           .driver_info = (unsigned long)&imon_default_table},
 371         /* device specifics unknown */
 372         { USB_DEVICE(0x15c2, 0x003d),
 373           .driver_info = (unsigned long)&imon_default_table},
 374         /* device specifics unknown */
 375         { USB_DEVICE(0x15c2, 0x003e),
 376           .driver_info = (unsigned long)&imon_default_table},
 377         /* device specifics unknown */
 378         { USB_DEVICE(0x15c2, 0x003f),
 379           .driver_info = (unsigned long)&imon_default_table},
 380         /* device specifics unknown */
 381         { USB_DEVICE(0x15c2, 0x0040),
 382           .driver_info = (unsigned long)&imon_default_table},
 383         /* SoundGraph iMON MINI (IR only) */
 384         { USB_DEVICE(0x15c2, 0x0041),
 385           .driver_info = (unsigned long)&imon_default_table},
 386         /* Antec Veris Multimedia Station EZ External (IR only) */
 387         { USB_DEVICE(0x15c2, 0x0042),
 388           .driver_info = (unsigned long)&imon_default_table},
 389         /* Antec Veris Multimedia Station Basic Internal (IR only) */
 390         { USB_DEVICE(0x15c2, 0x0043),
 391           .driver_info = (unsigned long)&imon_default_table},
 392         /* Antec Veris Multimedia Station Elite (IR & VFD) */
 393         { USB_DEVICE(0x15c2, 0x0044),
 394           .driver_info = (unsigned long)&imon_default_table},
 395         /* Antec Veris Multimedia Station Premiere (IR & LCD) */
 396         { USB_DEVICE(0x15c2, 0x0045),
 397           .driver_info = (unsigned long)&imon_default_table},
 398         /* device specifics unknown */
 399         { USB_DEVICE(0x15c2, 0x0046),
 400           .driver_info = (unsigned long)&imon_default_table},
 401         {}
 402 };
 403 
 404 /* USB Device data */
 405 static struct usb_driver imon_driver = {
 406         .name           = MOD_NAME,
 407         .probe          = imon_probe,
 408         .disconnect     = imon_disconnect,
 409         .suspend        = imon_suspend,
 410         .resume         = imon_resume,
 411         .id_table       = imon_usb_id_table,
 412 };
 413 
 414 /* to prevent races between open() and disconnect(), probing, etc */
 415 static DEFINE_MUTEX(driver_lock);
 416 
 417 /* Module bookkeeping bits */
 418 MODULE_AUTHOR(MOD_AUTHOR);
 419 MODULE_DESCRIPTION(MOD_DESC);
 420 MODULE_VERSION(MOD_VERSION);
 421 MODULE_LICENSE("GPL");
 422 MODULE_DEVICE_TABLE(usb, imon_usb_id_table);
 423 
 424 static bool debug;
 425 module_param(debug, bool, S_IRUGO | S_IWUSR);
 426 MODULE_PARM_DESC(debug, "Debug messages: 0=no, 1=yes (default: no)");
 427 
 428 /* lcd, vfd, vga or none? should be auto-detected, but can be overridden... */
 429 static int display_type;
 430 module_param(display_type, int, S_IRUGO);
 431 MODULE_PARM_DESC(display_type, "Type of attached display. 0=autodetect, 1=vfd, 2=lcd, 3=vga, 4=none (default: autodetect)");
 432 
 433 static int pad_stabilize = 1;
 434 module_param(pad_stabilize, int, S_IRUGO | S_IWUSR);
 435 MODULE_PARM_DESC(pad_stabilize, "Apply stabilization algorithm to iMON PAD presses in arrow key mode. 0=disable, 1=enable (default).");
 436 
 437 /*
 438  * In certain use cases, mouse mode isn't really helpful, and could actually
 439  * cause confusion, so allow disabling it when the IR device is open.
 440  */
 441 static bool nomouse;
 442 module_param(nomouse, bool, S_IRUGO | S_IWUSR);
 443 MODULE_PARM_DESC(nomouse, "Disable mouse input device mode when IR device is open. 0=don't disable, 1=disable. (default: don't disable)");
 444 
 445 /* threshold at which a pad push registers as an arrow key in kbd mode */
 446 static int pad_thresh;
 447 module_param(pad_thresh, int, S_IRUGO | S_IWUSR);
 448 MODULE_PARM_DESC(pad_thresh, "Threshold at which a pad push registers as an arrow key in kbd mode (default: 28)");
 449 
 450 
 451 static void free_imon_context(struct imon_context *ictx)
 452 {
 453         struct device *dev = ictx->dev;
 454 
 455         usb_free_urb(ictx->tx_urb);
 456         usb_free_urb(ictx->rx_urb_intf0);
 457         usb_free_urb(ictx->rx_urb_intf1);
 458         kfree(ictx);
 459 
 460         dev_dbg(dev, "%s: iMON context freed\n", __func__);
 461 }
 462 
 463 /*
 464  * Called when the Display device (e.g. /dev/lcd0)
 465  * is opened by the application.
 466  */
 467 static int display_open(struct inode *inode, struct file *file)
 468 {
 469         struct usb_interface *interface;
 470         struct imon_context *ictx = NULL;
 471         int subminor;
 472         int retval = 0;
 473 
 474         /* prevent races with disconnect */
 475         mutex_lock(&driver_lock);
 476 
 477         subminor = iminor(inode);
 478         interface = usb_find_interface(&imon_driver, subminor);
 479         if (!interface) {
 480                 pr_err("could not find interface for minor %d\n", subminor);
 481                 retval = -ENODEV;
 482                 goto exit;
 483         }
 484         ictx = usb_get_intfdata(interface);
 485 
 486         if (!ictx) {
 487                 pr_err("no context found for minor %d\n", subminor);
 488                 retval = -ENODEV;
 489                 goto exit;
 490         }
 491 
 492         mutex_lock(&ictx->lock);
 493 
 494         if (!ictx->display_supported) {
 495                 pr_err("display not supported by device\n");
 496                 retval = -ENODEV;
 497         } else if (ictx->display_isopen) {
 498                 pr_err("display port is already open\n");
 499                 retval = -EBUSY;
 500         } else {
 501                 ictx->display_isopen = true;
 502                 file->private_data = ictx;
 503                 dev_dbg(ictx->dev, "display port opened\n");
 504         }
 505 
 506         mutex_unlock(&ictx->lock);
 507 
 508 exit:
 509         mutex_unlock(&driver_lock);
 510         return retval;
 511 }
 512 
 513 /*
 514  * Called when the display device (e.g. /dev/lcd0)
 515  * is closed by the application.
 516  */
 517 static int display_close(struct inode *inode, struct file *file)
 518 {
 519         struct imon_context *ictx = NULL;
 520         int retval = 0;
 521 
 522         ictx = file->private_data;
 523 
 524         if (!ictx) {
 525                 pr_err("no context for device\n");
 526                 return -ENODEV;
 527         }
 528 
 529         mutex_lock(&ictx->lock);
 530 
 531         if (!ictx->display_supported) {
 532                 pr_err("display not supported by device\n");
 533                 retval = -ENODEV;
 534         } else if (!ictx->display_isopen) {
 535                 pr_err("display is not open\n");
 536                 retval = -EIO;
 537         } else {
 538                 ictx->display_isopen = false;
 539                 dev_dbg(ictx->dev, "display port closed\n");
 540         }
 541 
 542         mutex_unlock(&ictx->lock);
 543         return retval;
 544 }
 545 
 546 /*
 547  * Sends a packet to the device -- this function must be called with
 548  * ictx->lock held, or its unlock/lock sequence while waiting for tx
 549  * to complete can/will lead to a deadlock.
 550  */
 551 static int send_packet(struct imon_context *ictx)
 552 {
 553         unsigned int pipe;
 554         unsigned long timeout;
 555         int interval = 0;
 556         int retval = 0;
 557         struct usb_ctrlrequest *control_req = NULL;
 558 
 559         /* Check if we need to use control or interrupt urb */
 560         if (!ictx->tx_control) {
 561                 pipe = usb_sndintpipe(ictx->usbdev_intf0,
 562                                       ictx->tx_endpoint->bEndpointAddress);
 563                 interval = ictx->tx_endpoint->bInterval;
 564 
 565                 usb_fill_int_urb(ictx->tx_urb, ictx->usbdev_intf0, pipe,
 566                                  ictx->usb_tx_buf,
 567                                  sizeof(ictx->usb_tx_buf),
 568                                  usb_tx_callback, ictx, interval);
 569 
 570                 ictx->tx_urb->actual_length = 0;
 571         } else {
 572                 /* fill request into kmalloc'ed space: */
 573                 control_req = kmalloc(sizeof(*control_req), GFP_KERNEL);
 574                 if (control_req == NULL)
 575                         return -ENOMEM;
 576 
 577                 /* setup packet is '21 09 0200 0001 0008' */
 578                 control_req->bRequestType = 0x21;
 579                 control_req->bRequest = 0x09;
 580                 control_req->wValue = cpu_to_le16(0x0200);
 581                 control_req->wIndex = cpu_to_le16(0x0001);
 582                 control_req->wLength = cpu_to_le16(0x0008);
 583 
 584                 /* control pipe is endpoint 0x00 */
 585                 pipe = usb_sndctrlpipe(ictx->usbdev_intf0, 0);
 586 
 587                 /* build the control urb */
 588                 usb_fill_control_urb(ictx->tx_urb, ictx->usbdev_intf0,
 589                                      pipe, (unsigned char *)control_req,
 590                                      ictx->usb_tx_buf,
 591                                      sizeof(ictx->usb_tx_buf),
 592                                      usb_tx_callback, ictx);
 593                 ictx->tx_urb->actual_length = 0;
 594         }
 595 
 596         reinit_completion(&ictx->tx.finished);
 597         ictx->tx.busy = true;
 598         smp_rmb(); /* ensure later readers know we're busy */
 599 
 600         retval = usb_submit_urb(ictx->tx_urb, GFP_KERNEL);
 601         if (retval) {
 602                 ictx->tx.busy = false;
 603                 smp_rmb(); /* ensure later readers know we're not busy */
 604                 pr_err_ratelimited("error submitting urb(%d)\n", retval);
 605         } else {
 606                 /* Wait for transmission to complete (or abort) */
 607                 mutex_unlock(&ictx->lock);
 608                 retval = wait_for_completion_interruptible(
 609                                 &ictx->tx.finished);
 610                 if (retval) {
 611                         usb_kill_urb(ictx->tx_urb);
 612                         pr_err_ratelimited("task interrupted\n");
 613                 }
 614                 mutex_lock(&ictx->lock);
 615 
 616                 retval = ictx->tx.status;
 617                 if (retval)
 618                         pr_err_ratelimited("packet tx failed (%d)\n", retval);
 619         }
 620 
 621         kfree(control_req);
 622 
 623         /*
 624          * Induce a mandatory delay before returning, as otherwise,
 625          * send_packet can get called so rapidly as to overwhelm the device,
 626          * particularly on faster systems and/or those with quirky usb.
 627          */
 628         timeout = msecs_to_jiffies(ictx->send_packet_delay);
 629         set_current_state(TASK_INTERRUPTIBLE);
 630         schedule_timeout(timeout);
 631 
 632         return retval;
 633 }
 634 
 635 /*
 636  * Sends an associate packet to the iMON 2.4G.
 637  *
 638  * This might not be such a good idea, since it has an id collision with
 639  * some versions of the "IR & VFD" combo. The only way to determine if it
 640  * is an RF version is to look at the product description string. (Which
 641  * we currently do not fetch).
 642  */
 643 static int send_associate_24g(struct imon_context *ictx)
 644 {
 645         int retval;
 646         const unsigned char packet[8] = { 0x01, 0x00, 0x00, 0x00,
 647                                           0x00, 0x00, 0x00, 0x20 };
 648 
 649         if (!ictx) {
 650                 pr_err("no context for device\n");
 651                 return -ENODEV;
 652         }
 653 
 654         if (!ictx->dev_present_intf0) {
 655                 pr_err("no iMON device present\n");
 656                 return -ENODEV;
 657         }
 658 
 659         memcpy(ictx->usb_tx_buf, packet, sizeof(packet));
 660         retval = send_packet(ictx);
 661 
 662         return retval;
 663 }
 664 
 665 /*
 666  * Sends packets to setup and show clock on iMON display
 667  *
 668  * Arguments: year - last 2 digits of year, month - 1..12,
 669  * day - 1..31, dow - day of the week (0-Sun...6-Sat),
 670  * hour - 0..23, minute - 0..59, second - 0..59
 671  */
 672 static int send_set_imon_clock(struct imon_context *ictx,
 673                                unsigned int year, unsigned int month,
 674                                unsigned int day, unsigned int dow,
 675                                unsigned int hour, unsigned int minute,
 676                                unsigned int second)
 677 {
 678         unsigned char clock_enable_pkt[IMON_CLOCK_ENABLE_PACKETS][8];
 679         int retval = 0;
 680         int i;
 681 
 682         if (!ictx) {
 683                 pr_err("no context for device\n");
 684                 return -ENODEV;
 685         }
 686 
 687         switch (ictx->display_type) {
 688         case IMON_DISPLAY_TYPE_LCD:
 689                 clock_enable_pkt[0][0] = 0x80;
 690                 clock_enable_pkt[0][1] = year;
 691                 clock_enable_pkt[0][2] = month-1;
 692                 clock_enable_pkt[0][3] = day;
 693                 clock_enable_pkt[0][4] = hour;
 694                 clock_enable_pkt[0][5] = minute;
 695                 clock_enable_pkt[0][6] = second;
 696 
 697                 clock_enable_pkt[1][0] = 0x80;
 698                 clock_enable_pkt[1][1] = 0;
 699                 clock_enable_pkt[1][2] = 0;
 700                 clock_enable_pkt[1][3] = 0;
 701                 clock_enable_pkt[1][4] = 0;
 702                 clock_enable_pkt[1][5] = 0;
 703                 clock_enable_pkt[1][6] = 0;
 704 
 705                 if (ictx->product == 0xffdc) {
 706                         clock_enable_pkt[0][7] = 0x50;
 707                         clock_enable_pkt[1][7] = 0x51;
 708                 } else {
 709                         clock_enable_pkt[0][7] = 0x88;
 710                         clock_enable_pkt[1][7] = 0x8a;
 711                 }
 712 
 713                 break;
 714 
 715         case IMON_DISPLAY_TYPE_VFD:
 716                 clock_enable_pkt[0][0] = year;
 717                 clock_enable_pkt[0][1] = month-1;
 718                 clock_enable_pkt[0][2] = day;
 719                 clock_enable_pkt[0][3] = dow;
 720                 clock_enable_pkt[0][4] = hour;
 721                 clock_enable_pkt[0][5] = minute;
 722                 clock_enable_pkt[0][6] = second;
 723                 clock_enable_pkt[0][7] = 0x40;
 724 
 725                 clock_enable_pkt[1][0] = 0;
 726                 clock_enable_pkt[1][1] = 0;
 727                 clock_enable_pkt[1][2] = 1;
 728                 clock_enable_pkt[1][3] = 0;
 729                 clock_enable_pkt[1][4] = 0;
 730                 clock_enable_pkt[1][5] = 0;
 731                 clock_enable_pkt[1][6] = 0;
 732                 clock_enable_pkt[1][7] = 0x42;
 733 
 734                 break;
 735 
 736         default:
 737                 return -ENODEV;
 738         }
 739 
 740         for (i = 0; i < IMON_CLOCK_ENABLE_PACKETS; i++) {
 741                 memcpy(ictx->usb_tx_buf, clock_enable_pkt[i], 8);
 742                 retval = send_packet(ictx);
 743                 if (retval) {
 744                         pr_err("send_packet failed for packet %d\n", i);
 745                         break;
 746                 }
 747         }
 748 
 749         return retval;
 750 }
 751 
 752 /*
 753  * These are the sysfs functions to handle the association on the iMON 2.4G LT.
 754  */
 755 static ssize_t show_associate_remote(struct device *d,
 756                                      struct device_attribute *attr,
 757                                      char *buf)
 758 {
 759         struct imon_context *ictx = dev_get_drvdata(d);
 760 
 761         if (!ictx)
 762                 return -ENODEV;
 763 
 764         mutex_lock(&ictx->lock);
 765         if (ictx->rf_isassociating)
 766                 strscpy(buf, "associating\n", PAGE_SIZE);
 767         else
 768                 strscpy(buf, "closed\n", PAGE_SIZE);
 769 
 770         dev_info(d, "Visit http://www.lirc.org/html/imon-24g.html for instructions on how to associate your iMON 2.4G DT/LT remote\n");
 771         mutex_unlock(&ictx->lock);
 772         return strlen(buf);
 773 }
 774 
 775 static ssize_t store_associate_remote(struct device *d,
 776                                       struct device_attribute *attr,
 777                                       const char *buf, size_t count)
 778 {
 779         struct imon_context *ictx;
 780 
 781         ictx = dev_get_drvdata(d);
 782 
 783         if (!ictx)
 784                 return -ENODEV;
 785 
 786         mutex_lock(&ictx->lock);
 787         ictx->rf_isassociating = true;
 788         send_associate_24g(ictx);
 789         mutex_unlock(&ictx->lock);
 790 
 791         return count;
 792 }
 793 
 794 /*
 795  * sysfs functions to control internal imon clock
 796  */
 797 static ssize_t show_imon_clock(struct device *d,
 798                                struct device_attribute *attr, char *buf)
 799 {
 800         struct imon_context *ictx = dev_get_drvdata(d);
 801         size_t len;
 802 
 803         if (!ictx)
 804                 return -ENODEV;
 805 
 806         mutex_lock(&ictx->lock);
 807 
 808         if (!ictx->display_supported) {
 809                 len = snprintf(buf, PAGE_SIZE, "Not supported.");
 810         } else {
 811                 len = snprintf(buf, PAGE_SIZE,
 812                         "To set the clock on your iMON display:\n"
 813                         "# date \"+%%y %%m %%d %%w %%H %%M %%S\" > imon_clock\n"
 814                         "%s", ictx->display_isopen ?
 815                         "\nNOTE: imon device must be closed\n" : "");
 816         }
 817 
 818         mutex_unlock(&ictx->lock);
 819 
 820         return len;
 821 }
 822 
 823 static ssize_t store_imon_clock(struct device *d,
 824                                 struct device_attribute *attr,
 825                                 const char *buf, size_t count)
 826 {
 827         struct imon_context *ictx = dev_get_drvdata(d);
 828         ssize_t retval;
 829         unsigned int year, month, day, dow, hour, minute, second;
 830 
 831         if (!ictx)
 832                 return -ENODEV;
 833 
 834         mutex_lock(&ictx->lock);
 835 
 836         if (!ictx->display_supported) {
 837                 retval = -ENODEV;
 838                 goto exit;
 839         } else if (ictx->display_isopen) {
 840                 retval = -EBUSY;
 841                 goto exit;
 842         }
 843 
 844         if (sscanf(buf, "%u %u %u %u %u %u %u", &year, &month, &day, &dow,
 845                    &hour, &minute, &second) != 7) {
 846                 retval = -EINVAL;
 847                 goto exit;
 848         }
 849 
 850         if ((month < 1 || month > 12) ||
 851             (day < 1 || day > 31) || (dow > 6) ||
 852             (hour > 23) || (minute > 59) || (second > 59)) {
 853                 retval = -EINVAL;
 854                 goto exit;
 855         }
 856 
 857         retval = send_set_imon_clock(ictx, year, month, day, dow,
 858                                      hour, minute, second);
 859         if (retval)
 860                 goto exit;
 861 
 862         retval = count;
 863 exit:
 864         mutex_unlock(&ictx->lock);
 865 
 866         return retval;
 867 }
 868 
 869 
 870 static DEVICE_ATTR(imon_clock, S_IWUSR | S_IRUGO, show_imon_clock,
 871                    store_imon_clock);
 872 
 873 static DEVICE_ATTR(associate_remote, S_IWUSR | S_IRUGO, show_associate_remote,
 874                    store_associate_remote);
 875 
 876 static struct attribute *imon_display_sysfs_entries[] = {
 877         &dev_attr_imon_clock.attr,
 878         NULL
 879 };
 880 
 881 static const struct attribute_group imon_display_attr_group = {
 882         .attrs = imon_display_sysfs_entries
 883 };
 884 
 885 static struct attribute *imon_rf_sysfs_entries[] = {
 886         &dev_attr_associate_remote.attr,
 887         NULL
 888 };
 889 
 890 static const struct attribute_group imon_rf_attr_group = {
 891         .attrs = imon_rf_sysfs_entries
 892 };
 893 
 894 /*
 895  * Writes data to the VFD.  The iMON VFD is 2x16 characters
 896  * and requires data in 5 consecutive USB interrupt packets,
 897  * each packet but the last carrying 7 bytes.
 898  *
 899  * I don't know if the VFD board supports features such as
 900  * scrolling, clearing rows, blanking, etc. so at
 901  * the caller must provide a full screen of data.  If fewer
 902  * than 32 bytes are provided spaces will be appended to
 903  * generate a full screen.
 904  */
 905 static ssize_t vfd_write(struct file *file, const char __user *buf,
 906                          size_t n_bytes, loff_t *pos)
 907 {
 908         int i;
 909         int offset;
 910         int seq;
 911         int retval = 0;
 912         struct imon_context *ictx;
 913         static const unsigned char vfd_packet6[] = {
 914                 0x01, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF };
 915 
 916         ictx = file->private_data;
 917         if (!ictx) {
 918                 pr_err_ratelimited("no context for device\n");
 919                 return -ENODEV;
 920         }
 921 
 922         mutex_lock(&ictx->lock);
 923 
 924         if (!ictx->dev_present_intf0) {
 925                 pr_err_ratelimited("no iMON device present\n");
 926                 retval = -ENODEV;
 927                 goto exit;
 928         }
 929 
 930         if (n_bytes <= 0 || n_bytes > 32) {
 931                 pr_err_ratelimited("invalid payload size\n");
 932                 retval = -EINVAL;
 933                 goto exit;
 934         }
 935 
 936         if (copy_from_user(ictx->tx.data_buf, buf, n_bytes)) {
 937                 retval = -EFAULT;
 938                 goto exit;
 939         }
 940 
 941         /* Pad with spaces */
 942         for (i = n_bytes; i < 32; ++i)
 943                 ictx->tx.data_buf[i] = ' ';
 944 
 945         for (i = 32; i < 35; ++i)
 946                 ictx->tx.data_buf[i] = 0xFF;
 947 
 948         offset = 0;
 949         seq = 0;
 950 
 951         do {
 952                 memcpy(ictx->usb_tx_buf, ictx->tx.data_buf + offset, 7);
 953                 ictx->usb_tx_buf[7] = (unsigned char) seq;
 954 
 955                 retval = send_packet(ictx);
 956                 if (retval) {
 957                         pr_err_ratelimited("send packet #%d failed\n", seq / 2);
 958                         goto exit;
 959                 } else {
 960                         seq += 2;
 961                         offset += 7;
 962                 }
 963 
 964         } while (offset < 35);
 965 
 966         /* Send packet #6 */
 967         memcpy(ictx->usb_tx_buf, &vfd_packet6, sizeof(vfd_packet6));
 968         ictx->usb_tx_buf[7] = (unsigned char) seq;
 969         retval = send_packet(ictx);
 970         if (retval)
 971                 pr_err_ratelimited("send packet #%d failed\n", seq / 2);
 972 
 973 exit:
 974         mutex_unlock(&ictx->lock);
 975 
 976         return (!retval) ? n_bytes : retval;
 977 }
 978 
 979 /*
 980  * Writes data to the LCD.  The iMON OEM LCD screen expects 8-byte
 981  * packets. We accept data as 16 hexadecimal digits, followed by a
 982  * newline (to make it easy to drive the device from a command-line
 983  * -- even though the actual binary data is a bit complicated).
 984  *
 985  * The device itself is not a "traditional" text-mode display. It's
 986  * actually a 16x96 pixel bitmap display. That means if you want to
 987  * display text, you've got to have your own "font" and translate the
 988  * text into bitmaps for display. This is really flexible (you can
 989  * display whatever diacritics you need, and so on), but it's also
 990  * a lot more complicated than most LCDs...
 991  */
 992 static ssize_t lcd_write(struct file *file, const char __user *buf,
 993                          size_t n_bytes, loff_t *pos)
 994 {
 995         int retval = 0;
 996         struct imon_context *ictx;
 997 
 998         ictx = file->private_data;
 999         if (!ictx) {
1000                 pr_err_ratelimited("no context for device\n");
1001                 return -ENODEV;
1002         }
1003 
1004         mutex_lock(&ictx->lock);
1005 
1006         if (!ictx->display_supported) {
1007                 pr_err_ratelimited("no iMON display present\n");
1008                 retval = -ENODEV;
1009                 goto exit;
1010         }
1011 
1012         if (n_bytes != 8) {
1013                 pr_err_ratelimited("invalid payload size: %d (expected 8)\n",
1014                                    (int)n_bytes);
1015                 retval = -EINVAL;
1016                 goto exit;
1017         }
1018 
1019         if (copy_from_user(ictx->usb_tx_buf, buf, 8)) {
1020                 retval = -EFAULT;
1021                 goto exit;
1022         }
1023 
1024         retval = send_packet(ictx);
1025         if (retval) {
1026                 pr_err_ratelimited("send packet failed!\n");
1027                 goto exit;
1028         } else {
1029                 dev_dbg(ictx->dev, "%s: write %d bytes to LCD\n",
1030                         __func__, (int) n_bytes);
1031         }
1032 exit:
1033         mutex_unlock(&ictx->lock);
1034         return (!retval) ? n_bytes : retval;
1035 }
1036 
1037 /*
1038  * Callback function for USB core API: transmit data
1039  */
1040 static void usb_tx_callback(struct urb *urb)
1041 {
1042         struct imon_context *ictx;
1043 
1044         if (!urb)
1045                 return;
1046         ictx = (struct imon_context *)urb->context;
1047         if (!ictx)
1048                 return;
1049 
1050         ictx->tx.status = urb->status;
1051 
1052         /* notify waiters that write has finished */
1053         ictx->tx.busy = false;
1054         smp_rmb(); /* ensure later readers know we're not busy */
1055         complete(&ictx->tx.finished);
1056 }
1057 
1058 /*
1059  * report touchscreen input
1060  */
1061 static void imon_touch_display_timeout(struct timer_list *t)
1062 {
1063         struct imon_context *ictx = from_timer(ictx, t, ttimer);
1064 
1065         if (ictx->display_type != IMON_DISPLAY_TYPE_VGA)
1066                 return;
1067 
1068         input_report_abs(ictx->touch, ABS_X, ictx->touch_x);
1069         input_report_abs(ictx->touch, ABS_Y, ictx->touch_y);
1070         input_report_key(ictx->touch, BTN_TOUCH, 0x00);
1071         input_sync(ictx->touch);
1072 }
1073 
1074 /*
1075  * iMON IR receivers support two different signal sets -- those used by
1076  * the iMON remotes, and those used by the Windows MCE remotes (which is
1077  * really just RC-6), but only one or the other at a time, as the signals
1078  * are decoded onboard the receiver.
1079  *
1080  * This function gets called two different ways, one way is from
1081  * rc_register_device, for initial protocol selection/setup, and the other is
1082  * via a userspace-initiated protocol change request, either by direct sysfs
1083  * prodding or by something like ir-keytable. In the rc_register_device case,
1084  * the imon context lock is already held, but when initiated from userspace,
1085  * it is not, so we must acquire it prior to calling send_packet, which
1086  * requires that the lock is held.
1087  */
1088 static int imon_ir_change_protocol(struct rc_dev *rc, u64 *rc_proto)
1089 {
1090         int retval;
1091         struct imon_context *ictx = rc->priv;
1092         struct device *dev = ictx->dev;
1093         bool unlock = false;
1094         unsigned char ir_proto_packet[] = {
1095                 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x86 };
1096 
1097         if (*rc_proto && !(*rc_proto & rc->allowed_protocols))
1098                 dev_warn(dev, "Looks like you're trying to use an IR protocol this device does not support\n");
1099 
1100         if (*rc_proto & RC_PROTO_BIT_RC6_MCE) {
1101                 dev_dbg(dev, "Configuring IR receiver for MCE protocol\n");
1102                 ir_proto_packet[0] = 0x01;
1103                 *rc_proto = RC_PROTO_BIT_RC6_MCE;
1104         } else if (*rc_proto & RC_PROTO_BIT_IMON) {
1105                 dev_dbg(dev, "Configuring IR receiver for iMON protocol\n");
1106                 if (!pad_stabilize)
1107                         dev_dbg(dev, "PAD stabilize functionality disabled\n");
1108                 /* ir_proto_packet[0] = 0x00; // already the default */
1109                 *rc_proto = RC_PROTO_BIT_IMON;
1110         } else {
1111                 dev_warn(dev, "Unsupported IR protocol specified, overriding to iMON IR protocol\n");
1112                 if (!pad_stabilize)
1113                         dev_dbg(dev, "PAD stabilize functionality disabled\n");
1114                 /* ir_proto_packet[0] = 0x00; // already the default */
1115                 *rc_proto = RC_PROTO_BIT_IMON;
1116         }
1117 
1118         memcpy(ictx->usb_tx_buf, &ir_proto_packet, sizeof(ir_proto_packet));
1119 
1120         if (!mutex_is_locked(&ictx->lock)) {
1121                 unlock = true;
1122                 mutex_lock(&ictx->lock);
1123         }
1124 
1125         retval = send_packet(ictx);
1126         if (retval)
1127                 goto out;
1128 
1129         ictx->rc_proto = *rc_proto;
1130         ictx->pad_mouse = false;
1131 
1132 out:
1133         if (unlock)
1134                 mutex_unlock(&ictx->lock);
1135 
1136         return retval;
1137 }
1138 
1139 /*
1140  * The directional pad behaves a bit differently, depending on whether this is
1141  * one of the older ffdc devices or a newer device. Newer devices appear to
1142  * have a higher resolution matrix for more precise mouse movement, but it
1143  * makes things overly sensitive in keyboard mode, so we do some interesting
1144  * contortions to make it less touchy. Older devices run through the same
1145  * routine with shorter timeout and a smaller threshold.
1146  */
1147 static int stabilize(int a, int b, u16 timeout, u16 threshold)
1148 {
1149         ktime_t ct;
1150         static ktime_t prev_time;
1151         static ktime_t hit_time;
1152         static int x, y, prev_result, hits;
1153         int result = 0;
1154         long msec, msec_hit;
1155 
1156         ct = ktime_get();
1157         msec = ktime_ms_delta(ct, prev_time);
1158         msec_hit = ktime_ms_delta(ct, hit_time);
1159 
1160         if (msec > 100) {
1161                 x = 0;
1162                 y = 0;
1163                 hits = 0;
1164         }
1165 
1166         x += a;
1167         y += b;
1168 
1169         prev_time = ct;
1170 
1171         if (abs(x) > threshold || abs(y) > threshold) {
1172                 if (abs(y) > abs(x))
1173                         result = (y > 0) ? 0x7F : 0x80;
1174                 else
1175                         result = (x > 0) ? 0x7F00 : 0x8000;
1176 
1177                 x = 0;
1178                 y = 0;
1179 
1180                 if (result == prev_result) {
1181                         hits++;
1182 
1183                         if (hits > 3) {
1184                                 switch (result) {
1185                                 case 0x7F:
1186                                         y = 17 * threshold / 30;
1187                                         break;
1188                                 case 0x80:
1189                                         y -= 17 * threshold / 30;
1190                                         break;
1191                                 case 0x7F00:
1192                                         x = 17 * threshold / 30;
1193                                         break;
1194                                 case 0x8000:
1195                                         x -= 17 * threshold / 30;
1196                                         break;
1197                                 }
1198                         }
1199 
1200                         if (hits == 2 && msec_hit < timeout) {
1201                                 result = 0;
1202                                 hits = 1;
1203                         }
1204                 } else {
1205                         prev_result = result;
1206                         hits = 1;
1207                         hit_time = ct;
1208                 }
1209         }
1210 
1211         return result;
1212 }
1213 
1214 static u32 imon_remote_key_lookup(struct imon_context *ictx, u32 scancode)
1215 {
1216         u32 keycode;
1217         u32 release;
1218         bool is_release_code = false;
1219 
1220         /* Look for the initial press of a button */
1221         keycode = rc_g_keycode_from_table(ictx->rdev, scancode);
1222         ictx->rc_toggle = 0x0;
1223         ictx->rc_scancode = scancode;
1224 
1225         /* Look for the release of a button */
1226         if (keycode == KEY_RESERVED) {
1227                 release = scancode & ~0x4000;
1228                 keycode = rc_g_keycode_from_table(ictx->rdev, release);
1229                 if (keycode != KEY_RESERVED)
1230                         is_release_code = true;
1231         }
1232 
1233         ictx->release_code = is_release_code;
1234 
1235         return keycode;
1236 }
1237 
1238 static u32 imon_mce_key_lookup(struct imon_context *ictx, u32 scancode)
1239 {
1240         u32 keycode;
1241 
1242 #define MCE_KEY_MASK 0x7000
1243 #define MCE_TOGGLE_BIT 0x8000
1244 
1245         /*
1246          * On some receivers, mce keys decode to 0x8000f04xx and 0x8000f84xx
1247          * (the toggle bit flipping between alternating key presses), while
1248          * on other receivers, we see 0x8000f74xx and 0x8000ff4xx. To keep
1249          * the table trim, we always or in the bits to look up 0x8000ff4xx,
1250          * but we can't or them into all codes, as some keys are decoded in
1251          * a different way w/o the same use of the toggle bit...
1252          */
1253         if (scancode & 0x80000000)
1254                 scancode = scancode | MCE_KEY_MASK | MCE_TOGGLE_BIT;
1255 
1256         ictx->rc_scancode = scancode;
1257         keycode = rc_g_keycode_from_table(ictx->rdev, scancode);
1258 
1259         /* not used in mce mode, but make sure we know its false */
1260         ictx->release_code = false;
1261 
1262         return keycode;
1263 }
1264 
1265 static u32 imon_panel_key_lookup(struct imon_context *ictx, u64 code)
1266 {
1267         int i;
1268         u32 keycode = KEY_RESERVED;
1269         struct imon_panel_key_table *key_table = ictx->dev_descr->key_table;
1270 
1271         for (i = 0; key_table[i].hw_code != 0; i++) {
1272                 if (key_table[i].hw_code == (code | 0xffee)) {
1273                         keycode = key_table[i].keycode;
1274                         break;
1275                 }
1276         }
1277         ictx->release_code = false;
1278         return keycode;
1279 }
1280 
1281 static bool imon_mouse_event(struct imon_context *ictx,
1282                              unsigned char *buf, int len)
1283 {
1284         signed char rel_x = 0x00, rel_y = 0x00;
1285         u8 right_shift = 1;
1286         bool mouse_input = true;
1287         int dir = 0;
1288         unsigned long flags;
1289 
1290         spin_lock_irqsave(&ictx->kc_lock, flags);
1291 
1292         /* newer iMON device PAD or mouse button */
1293         if (ictx->product != 0xffdc && (buf[0] & 0x01) && len == 5) {
1294                 rel_x = buf[2];
1295                 rel_y = buf[3];
1296                 right_shift = 1;
1297         /* 0xffdc iMON PAD or mouse button input */
1298         } else if (ictx->product == 0xffdc && (buf[0] & 0x40) &&
1299                         !((buf[1] & 0x01) || ((buf[1] >> 2) & 0x01))) {
1300                 rel_x = (buf[1] & 0x08) | (buf[1] & 0x10) >> 2 |
1301                         (buf[1] & 0x20) >> 4 | (buf[1] & 0x40) >> 6;
1302                 if (buf[0] & 0x02)
1303                         rel_x |= ~0x0f;
1304                 rel_x = rel_x + rel_x / 2;
1305                 rel_y = (buf[2] & 0x08) | (buf[2] & 0x10) >> 2 |
1306                         (buf[2] & 0x20) >> 4 | (buf[2] & 0x40) >> 6;
1307                 if (buf[0] & 0x01)
1308                         rel_y |= ~0x0f;
1309                 rel_y = rel_y + rel_y / 2;
1310                 right_shift = 2;
1311         /* some ffdc devices decode mouse buttons differently... */
1312         } else if (ictx->product == 0xffdc && (buf[0] == 0x68)) {
1313                 right_shift = 2;
1314         /* ch+/- buttons, which we use for an emulated scroll wheel */
1315         } else if (ictx->kc == KEY_CHANNELUP && (buf[2] & 0x40) != 0x40) {
1316                 dir = 1;
1317         } else if (ictx->kc == KEY_CHANNELDOWN && (buf[2] & 0x40) != 0x40) {
1318                 dir = -1;
1319         } else
1320                 mouse_input = false;
1321 
1322         spin_unlock_irqrestore(&ictx->kc_lock, flags);
1323 
1324         if (mouse_input) {
1325                 dev_dbg(ictx->dev, "sending mouse data via input subsystem\n");
1326 
1327                 if (dir) {
1328                         input_report_rel(ictx->idev, REL_WHEEL, dir);
1329                 } else if (rel_x || rel_y) {
1330                         input_report_rel(ictx->idev, REL_X, rel_x);
1331                         input_report_rel(ictx->idev, REL_Y, rel_y);
1332                 } else {
1333                         input_report_key(ictx->idev, BTN_LEFT, buf[1] & 0x1);
1334                         input_report_key(ictx->idev, BTN_RIGHT,
1335                                          buf[1] >> right_shift & 0x1);
1336                 }
1337                 input_sync(ictx->idev);
1338                 spin_lock_irqsave(&ictx->kc_lock, flags);
1339                 ictx->last_keycode = ictx->kc;
1340                 spin_unlock_irqrestore(&ictx->kc_lock, flags);
1341         }
1342 
1343         return mouse_input;
1344 }
1345 
1346 static void imon_touch_event(struct imon_context *ictx, unsigned char *buf)
1347 {
1348         mod_timer(&ictx->ttimer, jiffies + TOUCH_TIMEOUT);
1349         ictx->touch_x = (buf[0] << 4) | (buf[1] >> 4);
1350         ictx->touch_y = 0xfff - ((buf[2] << 4) | (buf[1] & 0xf));
1351         input_report_abs(ictx->touch, ABS_X, ictx->touch_x);
1352         input_report_abs(ictx->touch, ABS_Y, ictx->touch_y);
1353         input_report_key(ictx->touch, BTN_TOUCH, 0x01);
1354         input_sync(ictx->touch);
1355 }
1356 
1357 static void imon_pad_to_keys(struct imon_context *ictx, unsigned char *buf)
1358 {
1359         int dir = 0;
1360         signed char rel_x = 0x00, rel_y = 0x00;
1361         u16 timeout, threshold;
1362         u32 scancode = KEY_RESERVED;
1363         unsigned long flags;
1364 
1365         /*
1366          * The imon directional pad functions more like a touchpad. Bytes 3 & 4
1367          * contain a position coordinate (x,y), with each component ranging
1368          * from -14 to 14. We want to down-sample this to only 4 discrete values
1369          * for up/down/left/right arrow keys. Also, when you get too close to
1370          * diagonals, it has a tendency to jump back and forth, so lets try to
1371          * ignore when they get too close.
1372          */
1373         if (ictx->product != 0xffdc) {
1374                 /* first, pad to 8 bytes so it conforms with everything else */
1375                 buf[5] = buf[6] = buf[7] = 0;
1376                 timeout = 500;  /* in msecs */
1377                 /* (2*threshold) x (2*threshold) square */
1378                 threshold = pad_thresh ? pad_thresh : 28;
1379                 rel_x = buf[2];
1380                 rel_y = buf[3];
1381 
1382                 if (ictx->rc_proto == RC_PROTO_BIT_IMON && pad_stabilize) {
1383                         if ((buf[1] == 0) && ((rel_x != 0) || (rel_y != 0))) {
1384                                 dir = stabilize((int)rel_x, (int)rel_y,
1385                                                 timeout, threshold);
1386                                 if (!dir) {
1387                                         spin_lock_irqsave(&ictx->kc_lock,
1388                                                           flags);
1389                                         ictx->kc = KEY_UNKNOWN;
1390                                         spin_unlock_irqrestore(&ictx->kc_lock,
1391                                                                flags);
1392                                         return;
1393                                 }
1394                                 buf[2] = dir & 0xFF;
1395                                 buf[3] = (dir >> 8) & 0xFF;
1396                                 scancode = be32_to_cpu(*((__be32 *)buf));
1397                         }
1398                 } else {
1399                         /*
1400                          * Hack alert: instead of using keycodes, we have
1401                          * to use hard-coded scancodes here...
1402                          */
1403                         if (abs(rel_y) > abs(rel_x)) {
1404                                 buf[2] = (rel_y > 0) ? 0x7F : 0x80;
1405                                 buf[3] = 0;
1406                                 if (rel_y > 0)
1407                                         scancode = 0x01007f00; /* KEY_DOWN */
1408                                 else
1409                                         scancode = 0x01008000; /* KEY_UP */
1410                         } else {
1411                                 buf[2] = 0;
1412                                 buf[3] = (rel_x > 0) ? 0x7F : 0x80;
1413                                 if (rel_x > 0)
1414                                         scancode = 0x0100007f; /* KEY_RIGHT */
1415                                 else
1416                                         scancode = 0x01000080; /* KEY_LEFT */
1417                         }
1418                 }
1419 
1420         /*
1421          * Handle on-board decoded pad events for e.g. older VFD/iMON-Pad
1422          * device (15c2:ffdc). The remote generates various codes from
1423          * 0x68nnnnB7 to 0x6AnnnnB7, the left mouse button generates
1424          * 0x688301b7 and the right one 0x688481b7. All other keys generate
1425          * 0x2nnnnnnn. Position coordinate is encoded in buf[1] and buf[2] with
1426          * reversed endianness. Extract direction from buffer, rotate endianness,
1427          * adjust sign and feed the values into stabilize(). The resulting codes
1428          * will be 0x01008000, 0x01007F00, which match the newer devices.
1429          */
1430         } else {
1431                 timeout = 10;   /* in msecs */
1432                 /* (2*threshold) x (2*threshold) square */
1433                 threshold = pad_thresh ? pad_thresh : 15;
1434 
1435                 /* buf[1] is x */
1436                 rel_x = (buf[1] & 0x08) | (buf[1] & 0x10) >> 2 |
1437                         (buf[1] & 0x20) >> 4 | (buf[1] & 0x40) >> 6;
1438                 if (buf[0] & 0x02)
1439                         rel_x |= ~0x10+1;
1440                 /* buf[2] is y */
1441                 rel_y = (buf[2] & 0x08) | (buf[2] & 0x10) >> 2 |
1442                         (buf[2] & 0x20) >> 4 | (buf[2] & 0x40) >> 6;
1443                 if (buf[0] & 0x01)
1444                         rel_y |= ~0x10+1;
1445 
1446                 buf[0] = 0x01;
1447                 buf[1] = buf[4] = buf[5] = buf[6] = buf[7] = 0;
1448 
1449                 if (ictx->rc_proto == RC_PROTO_BIT_IMON && pad_stabilize) {
1450                         dir = stabilize((int)rel_x, (int)rel_y,
1451                                         timeout, threshold);
1452                         if (!dir) {
1453                                 spin_lock_irqsave(&ictx->kc_lock, flags);
1454                                 ictx->kc = KEY_UNKNOWN;
1455                                 spin_unlock_irqrestore(&ictx->kc_lock, flags);
1456                                 return;
1457                         }
1458                         buf[2] = dir & 0xFF;
1459                         buf[3] = (dir >> 8) & 0xFF;
1460                         scancode = be32_to_cpu(*((__be32 *)buf));
1461                 } else {
1462                         /*
1463                          * Hack alert: instead of using keycodes, we have
1464                          * to use hard-coded scancodes here...
1465                          */
1466                         if (abs(rel_y) > abs(rel_x)) {
1467                                 buf[2] = (rel_y > 0) ? 0x7F : 0x80;
1468                                 buf[3] = 0;
1469                                 if (rel_y > 0)
1470                                         scancode = 0x01007f00; /* KEY_DOWN */
1471                                 else
1472                                         scancode = 0x01008000; /* KEY_UP */
1473                         } else {
1474                                 buf[2] = 0;
1475                                 buf[3] = (rel_x > 0) ? 0x7F : 0x80;
1476                                 if (rel_x > 0)
1477                                         scancode = 0x0100007f; /* KEY_RIGHT */
1478                                 else
1479                                         scancode = 0x01000080; /* KEY_LEFT */
1480                         }
1481                 }
1482         }
1483 
1484         if (scancode) {
1485                 spin_lock_irqsave(&ictx->kc_lock, flags);
1486                 ictx->kc = imon_remote_key_lookup(ictx, scancode);
1487                 spin_unlock_irqrestore(&ictx->kc_lock, flags);
1488         }
1489 }
1490 
1491 /*
1492  * figure out if these is a press or a release. We don't actually
1493  * care about repeats, as those will be auto-generated within the IR
1494  * subsystem for repeating scancodes.
1495  */
1496 static int imon_parse_press_type(struct imon_context *ictx,
1497                                  unsigned char *buf, u8 ktype)
1498 {
1499         int press_type = 0;
1500         unsigned long flags;
1501 
1502         spin_lock_irqsave(&ictx->kc_lock, flags);
1503 
1504         /* key release of 0x02XXXXXX key */
1505         if (ictx->kc == KEY_RESERVED && buf[0] == 0x02 && buf[3] == 0x00)
1506                 ictx->kc = ictx->last_keycode;
1507 
1508         /* mouse button release on (some) 0xffdc devices */
1509         else if (ictx->kc == KEY_RESERVED && buf[0] == 0x68 && buf[1] == 0x82 &&
1510                  buf[2] == 0x81 && buf[3] == 0xb7)
1511                 ictx->kc = ictx->last_keycode;
1512 
1513         /* mouse button release on (some other) 0xffdc devices */
1514         else if (ictx->kc == KEY_RESERVED && buf[0] == 0x01 && buf[1] == 0x00 &&
1515                  buf[2] == 0x81 && buf[3] == 0xb7)
1516                 ictx->kc = ictx->last_keycode;
1517 
1518         /* mce-specific button handling, no keyup events */
1519         else if (ktype == IMON_KEY_MCE) {
1520                 ictx->rc_toggle = buf[2];
1521                 press_type = 1;
1522 
1523         /* incoherent or irrelevant data */
1524         } else if (ictx->kc == KEY_RESERVED)
1525                 press_type = -EINVAL;
1526 
1527         /* key release of 0xXXXXXXb7 key */
1528         else if (ictx->release_code)
1529                 press_type = 0;
1530 
1531         /* this is a button press */
1532         else
1533                 press_type = 1;
1534 
1535         spin_unlock_irqrestore(&ictx->kc_lock, flags);
1536 
1537         return press_type;
1538 }
1539 
1540 /*
1541  * Process the incoming packet
1542  */
1543 static void imon_incoming_packet(struct imon_context *ictx,
1544                                  struct urb *urb, int intf)
1545 {
1546         int len = urb->actual_length;
1547         unsigned char *buf = urb->transfer_buffer;
1548         struct device *dev = ictx->dev;
1549         unsigned long flags;
1550         u32 kc;
1551         u64 scancode;
1552         int press_type = 0;
1553         long msec;
1554         ktime_t t;
1555         static ktime_t prev_time;
1556         u8 ktype;
1557 
1558         /* filter out junk data on the older 0xffdc imon devices */
1559         if ((buf[0] == 0xff) && (buf[1] == 0xff) && (buf[2] == 0xff))
1560                 return;
1561 
1562         /* Figure out what key was pressed */
1563         if (len == 8 && buf[7] == 0xee) {
1564                 scancode = be64_to_cpu(*((__be64 *)buf));
1565                 ktype = IMON_KEY_PANEL;
1566                 kc = imon_panel_key_lookup(ictx, scancode);
1567                 ictx->release_code = false;
1568         } else {
1569                 scancode = be32_to_cpu(*((__be32 *)buf));
1570                 if (ictx->rc_proto == RC_PROTO_BIT_RC6_MCE) {
1571                         ktype = IMON_KEY_IMON;
1572                         if (buf[0] == 0x80)
1573                                 ktype = IMON_KEY_MCE;
1574                         kc = imon_mce_key_lookup(ictx, scancode);
1575                 } else {
1576                         ktype = IMON_KEY_IMON;
1577                         kc = imon_remote_key_lookup(ictx, scancode);
1578                 }
1579         }
1580 
1581         spin_lock_irqsave(&ictx->kc_lock, flags);
1582         /* keyboard/mouse mode toggle button */
1583         if (kc == KEY_KEYBOARD && !ictx->release_code) {
1584                 ictx->last_keycode = kc;
1585                 if (!nomouse) {
1586                         ictx->pad_mouse = !ictx->pad_mouse;
1587                         dev_dbg(dev, "toggling to %s mode\n",
1588                                 ictx->pad_mouse ? "mouse" : "keyboard");
1589                         spin_unlock_irqrestore(&ictx->kc_lock, flags);
1590                         return;
1591                 } else {
1592                         ictx->pad_mouse = false;
1593                         dev_dbg(dev, "mouse mode disabled, passing key value\n");
1594                 }
1595         }
1596 
1597         ictx->kc = kc;
1598         spin_unlock_irqrestore(&ictx->kc_lock, flags);
1599 
1600         /* send touchscreen events through input subsystem if touchpad data */
1601         if (ictx->touch && len == 8 && buf[7] == 0x86) {
1602                 imon_touch_event(ictx, buf);
1603                 return;
1604 
1605         /* look for mouse events with pad in mouse mode */
1606         } else if (ictx->pad_mouse) {
1607                 if (imon_mouse_event(ictx, buf, len))
1608                         return;
1609         }
1610 
1611         /* Now for some special handling to convert pad input to arrow keys */
1612         if (((len == 5) && (buf[0] == 0x01) && (buf[4] == 0x00)) ||
1613             ((len == 8) && (buf[0] & 0x40) &&
1614              !(buf[1] & 0x1 || buf[1] >> 2 & 0x1))) {
1615                 len = 8;
1616                 imon_pad_to_keys(ictx, buf);
1617         }
1618 
1619         if (debug) {
1620                 printk(KERN_INFO "intf%d decoded packet: %*ph\n",
1621                        intf, len, buf);
1622         }
1623 
1624         press_type = imon_parse_press_type(ictx, buf, ktype);
1625         if (press_type < 0)
1626                 goto not_input_data;
1627 
1628         if (ktype != IMON_KEY_PANEL) {
1629                 if (press_type == 0)
1630                         rc_keyup(ictx->rdev);
1631                 else {
1632                         enum rc_proto proto;
1633 
1634                         if (ictx->rc_proto == RC_PROTO_BIT_RC6_MCE)
1635                                 proto = RC_PROTO_RC6_MCE;
1636                         else if (ictx->rc_proto == RC_PROTO_BIT_IMON)
1637                                 proto = RC_PROTO_IMON;
1638                         else
1639                                 return;
1640 
1641                         rc_keydown(ictx->rdev, proto, ictx->rc_scancode,
1642                                    ictx->rc_toggle);
1643 
1644                         spin_lock_irqsave(&ictx->kc_lock, flags);
1645                         ictx->last_keycode = ictx->kc;
1646                         spin_unlock_irqrestore(&ictx->kc_lock, flags);
1647                 }
1648                 return;
1649         }
1650 
1651         /* Only panel type events left to process now */
1652         spin_lock_irqsave(&ictx->kc_lock, flags);
1653 
1654         t = ktime_get();
1655         /* KEY_MUTE repeats from knob need to be suppressed */
1656         if (ictx->kc == KEY_MUTE && ictx->kc == ictx->last_keycode) {
1657                 msec = ktime_ms_delta(t, prev_time);
1658                 if (msec < ictx->idev->rep[REP_DELAY]) {
1659                         spin_unlock_irqrestore(&ictx->kc_lock, flags);
1660                         return;
1661                 }
1662         }
1663         prev_time = t;
1664         kc = ictx->kc;
1665 
1666         spin_unlock_irqrestore(&ictx->kc_lock, flags);
1667 
1668         input_report_key(ictx->idev, kc, press_type);
1669         input_sync(ictx->idev);
1670 
1671         /* panel keys don't generate a release */
1672         input_report_key(ictx->idev, kc, 0);
1673         input_sync(ictx->idev);
1674 
1675         spin_lock_irqsave(&ictx->kc_lock, flags);
1676         ictx->last_keycode = kc;
1677         spin_unlock_irqrestore(&ictx->kc_lock, flags);
1678 
1679         return;
1680 
1681 not_input_data:
1682         if (len != 8) {
1683                 dev_warn(dev, "imon %s: invalid incoming packet size (len = %d, intf%d)\n",
1684                          __func__, len, intf);
1685                 return;
1686         }
1687 
1688         /* iMON 2.4G associate frame */
1689         if (buf[0] == 0x00 &&
1690             buf[2] == 0xFF &&                           /* REFID */
1691             buf[3] == 0xFF &&
1692             buf[4] == 0xFF &&
1693             buf[5] == 0xFF &&                           /* iMON 2.4G */
1694            ((buf[6] == 0x4E && buf[7] == 0xDF) ||       /* LT */
1695             (buf[6] == 0x5E && buf[7] == 0xDF))) {      /* DT */
1696                 dev_warn(dev, "%s: remote associated refid=%02X\n",
1697                          __func__, buf[1]);
1698                 ictx->rf_isassociating = false;
1699         }
1700 }
1701 
1702 /*
1703  * Callback function for USB core API: receive data
1704  */
1705 static void usb_rx_callback_intf0(struct urb *urb)
1706 {
1707         struct imon_context *ictx;
1708         int intfnum = 0;
1709 
1710         if (!urb)
1711                 return;
1712 
1713         ictx = (struct imon_context *)urb->context;
1714         if (!ictx)
1715                 return;
1716 
1717         /*
1718          * if we get a callback before we're done configuring the hardware, we
1719          * can't yet process the data, as there's nowhere to send it, but we
1720          * still need to submit a new rx URB to avoid wedging the hardware
1721          */
1722         if (!ictx->dev_present_intf0)
1723                 goto out;
1724 
1725         switch (urb->status) {
1726         case -ENOENT:           /* usbcore unlink successful! */
1727                 return;
1728 
1729         case -ESHUTDOWN:        /* transport endpoint was shut down */
1730                 break;
1731 
1732         case 0:
1733                 imon_incoming_packet(ictx, urb, intfnum);
1734                 break;
1735 
1736         default:
1737                 dev_warn(ictx->dev, "imon %s: status(%d): ignored\n",
1738                          __func__, urb->status);
1739                 break;
1740         }
1741 
1742 out:
1743         usb_submit_urb(ictx->rx_urb_intf0, GFP_ATOMIC);
1744 }
1745 
1746 static void usb_rx_callback_intf1(struct urb *urb)
1747 {
1748         struct imon_context *ictx;
1749         int intfnum = 1;
1750 
1751         if (!urb)
1752                 return;
1753 
1754         ictx = (struct imon_context *)urb->context;
1755         if (!ictx)
1756                 return;
1757 
1758         /*
1759          * if we get a callback before we're done configuring the hardware, we
1760          * can't yet process the data, as there's nowhere to send it, but we
1761          * still need to submit a new rx URB to avoid wedging the hardware
1762          */
1763         if (!ictx->dev_present_intf1)
1764                 goto out;
1765 
1766         switch (urb->status) {
1767         case -ENOENT:           /* usbcore unlink successful! */
1768                 return;
1769 
1770         case -ESHUTDOWN:        /* transport endpoint was shut down */
1771                 break;
1772 
1773         case 0:
1774                 imon_incoming_packet(ictx, urb, intfnum);
1775                 break;
1776 
1777         default:
1778                 dev_warn(ictx->dev, "imon %s: status(%d): ignored\n",
1779                          __func__, urb->status);
1780                 break;
1781         }
1782 
1783 out:
1784         usb_submit_urb(ictx->rx_urb_intf1, GFP_ATOMIC);
1785 }
1786 
1787 /*
1788  * The 0x15c2:0xffdc device ID was used for umpteen different imon
1789  * devices, and all of them constantly spew interrupts, even when there
1790  * is no actual data to report. However, byte 6 of this buffer looks like
1791  * its unique across device variants, so we're trying to key off that to
1792  * figure out which display type (if any) and what IR protocol the device
1793  * actually supports. These devices have their IR protocol hard-coded into
1794  * their firmware, they can't be changed on the fly like the newer hardware.
1795  */
1796 static void imon_get_ffdc_type(struct imon_context *ictx)
1797 {
1798         u8 ffdc_cfg_byte = ictx->usb_rx_buf[6];
1799         u8 detected_display_type = IMON_DISPLAY_TYPE_NONE;
1800         u64 allowed_protos = RC_PROTO_BIT_IMON;
1801 
1802         switch (ffdc_cfg_byte) {
1803         /* iMON Knob, no display, iMON IR + vol knob */
1804         case 0x21:
1805                 dev_info(ictx->dev, "0xffdc iMON Knob, iMON IR");
1806                 ictx->display_supported = false;
1807                 break;
1808         /* iMON 2.4G LT (usb stick), no display, iMON RF */
1809         case 0x4e:
1810                 dev_info(ictx->dev, "0xffdc iMON 2.4G LT, iMON RF");
1811                 ictx->display_supported = false;
1812                 ictx->rf_device = true;
1813                 break;
1814         /* iMON VFD, no IR (does have vol knob tho) */
1815         case 0x35:
1816                 dev_info(ictx->dev, "0xffdc iMON VFD + knob, no IR");
1817                 detected_display_type = IMON_DISPLAY_TYPE_VFD;
1818                 break;
1819         /* iMON VFD, iMON IR */
1820         case 0x24:
1821         case 0x30:
1822         case 0x85:
1823                 dev_info(ictx->dev, "0xffdc iMON VFD, iMON IR");
1824                 detected_display_type = IMON_DISPLAY_TYPE_VFD;
1825                 break;
1826         /* iMON VFD, MCE IR */
1827         case 0x46:
1828         case 0x9e:
1829                 dev_info(ictx->dev, "0xffdc iMON VFD, MCE IR");
1830                 detected_display_type = IMON_DISPLAY_TYPE_VFD;
1831                 allowed_protos = RC_PROTO_BIT_RC6_MCE;
1832                 break;
1833         /* iMON VFD, iMON or MCE IR */
1834         case 0x7e:
1835                 dev_info(ictx->dev, "0xffdc iMON VFD, iMON or MCE IR");
1836                 detected_display_type = IMON_DISPLAY_TYPE_VFD;
1837                 allowed_protos |= RC_PROTO_BIT_RC6_MCE;
1838                 break;
1839         /* iMON LCD, MCE IR */
1840         case 0x9f:
1841                 dev_info(ictx->dev, "0xffdc iMON LCD, MCE IR");
1842                 detected_display_type = IMON_DISPLAY_TYPE_LCD;
1843                 allowed_protos = RC_PROTO_BIT_RC6_MCE;
1844                 break;
1845         /* no display, iMON IR */
1846         case 0x26:
1847                 dev_info(ictx->dev, "0xffdc iMON Inside, iMON IR");
1848                 ictx->display_supported = false;
1849                 break;
1850         default:
1851                 dev_info(ictx->dev, "Unknown 0xffdc device, defaulting to VFD and iMON IR");
1852                 detected_display_type = IMON_DISPLAY_TYPE_VFD;
1853                 /*
1854                  * We don't know which one it is, allow user to set the
1855                  * RC6 one from userspace if IMON wasn't correct.
1856                  */
1857                 allowed_protos |= RC_PROTO_BIT_RC6_MCE;
1858                 break;
1859         }
1860 
1861         printk(KERN_CONT " (id 0x%02x)\n", ffdc_cfg_byte);
1862 
1863         ictx->display_type = detected_display_type;
1864         ictx->rc_proto = allowed_protos;
1865 }
1866 
1867 static void imon_set_display_type(struct imon_context *ictx)
1868 {
1869         u8 configured_display_type = IMON_DISPLAY_TYPE_VFD;
1870 
1871         /*
1872          * Try to auto-detect the type of display if the user hasn't set
1873          * it by hand via the display_type modparam. Default is VFD.
1874          */
1875 
1876         if (display_type == IMON_DISPLAY_TYPE_AUTO) {
1877                 switch (ictx->product) {
1878                 case 0xffdc:
1879                         /* set in imon_get_ffdc_type() */
1880                         configured_display_type = ictx->display_type;
1881                         break;
1882                 case 0x0034:
1883                 case 0x0035:
1884                         configured_display_type = IMON_DISPLAY_TYPE_VGA;
1885                         break;
1886                 case 0x0038:
1887                 case 0x0039:
1888                 case 0x0045:
1889                         configured_display_type = IMON_DISPLAY_TYPE_LCD;
1890                         break;
1891                 case 0x003c:
1892                 case 0x0041:
1893                 case 0x0042:
1894                 case 0x0043:
1895                         configured_display_type = IMON_DISPLAY_TYPE_NONE;
1896                         ictx->display_supported = false;
1897                         break;
1898                 case 0x0036:
1899                 case 0x0044:
1900                 default:
1901                         configured_display_type = IMON_DISPLAY_TYPE_VFD;
1902                         break;
1903                 }
1904         } else {
1905                 configured_display_type = display_type;
1906                 if (display_type == IMON_DISPLAY_TYPE_NONE)
1907                         ictx->display_supported = false;
1908                 else
1909                         ictx->display_supported = true;
1910                 dev_info(ictx->dev, "%s: overriding display type to %d via modparam\n",
1911                          __func__, display_type);
1912         }
1913 
1914         ictx->display_type = configured_display_type;
1915 }
1916 
1917 static struct rc_dev *imon_init_rdev(struct imon_context *ictx)
1918 {
1919         struct rc_dev *rdev;
1920         int ret;
1921         static const unsigned char fp_packet[] = {
1922                 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x88 };
1923 
1924         rdev = rc_allocate_device(RC_DRIVER_SCANCODE);
1925         if (!rdev) {
1926                 dev_err(ictx->dev, "remote control dev allocation failed\n");
1927                 goto out;
1928         }
1929 
1930         snprintf(ictx->name_rdev, sizeof(ictx->name_rdev),
1931                  "iMON Remote (%04x:%04x)", ictx->vendor, ictx->product);
1932         usb_make_path(ictx->usbdev_intf0, ictx->phys_rdev,
1933                       sizeof(ictx->phys_rdev));
1934         strlcat(ictx->phys_rdev, "/input0", sizeof(ictx->phys_rdev));
1935 
1936         rdev->device_name = ictx->name_rdev;
1937         rdev->input_phys = ictx->phys_rdev;
1938         usb_to_input_id(ictx->usbdev_intf0, &rdev->input_id);
1939         rdev->dev.parent = ictx->dev;
1940 
1941         rdev->priv = ictx;
1942         /* iMON PAD or MCE */
1943         rdev->allowed_protocols = RC_PROTO_BIT_IMON | RC_PROTO_BIT_RC6_MCE;
1944         rdev->change_protocol = imon_ir_change_protocol;
1945         rdev->driver_name = MOD_NAME;
1946 
1947         /* Enable front-panel buttons and/or knobs */
1948         memcpy(ictx->usb_tx_buf, &fp_packet, sizeof(fp_packet));
1949         ret = send_packet(ictx);
1950         /* Not fatal, but warn about it */
1951         if (ret)
1952                 dev_info(ictx->dev, "panel buttons/knobs setup failed\n");
1953 
1954         if (ictx->product == 0xffdc) {
1955                 imon_get_ffdc_type(ictx);
1956                 rdev->allowed_protocols = ictx->rc_proto;
1957         }
1958 
1959         imon_set_display_type(ictx);
1960 
1961         if (ictx->rc_proto == RC_PROTO_BIT_RC6_MCE)
1962                 rdev->map_name = RC_MAP_IMON_MCE;
1963         else
1964                 rdev->map_name = RC_MAP_IMON_PAD;
1965 
1966         ret = rc_register_device(rdev);
1967         if (ret < 0) {
1968                 dev_err(ictx->dev, "remote input dev register failed\n");
1969                 goto out;
1970         }
1971 
1972         return rdev;
1973 
1974 out:
1975         rc_free_device(rdev);
1976         return NULL;
1977 }
1978 
1979 static struct input_dev *imon_init_idev(struct imon_context *ictx)
1980 {
1981         struct imon_panel_key_table *key_table = ictx->dev_descr->key_table;
1982         struct input_dev *idev;
1983         int ret, i;
1984 
1985         idev = input_allocate_device();
1986         if (!idev)
1987                 goto out;
1988 
1989         snprintf(ictx->name_idev, sizeof(ictx->name_idev),
1990                  "iMON Panel, Knob and Mouse(%04x:%04x)",
1991                  ictx->vendor, ictx->product);
1992         idev->name = ictx->name_idev;
1993 
1994         usb_make_path(ictx->usbdev_intf0, ictx->phys_idev,
1995                       sizeof(ictx->phys_idev));
1996         strlcat(ictx->phys_idev, "/input1", sizeof(ictx->phys_idev));
1997         idev->phys = ictx->phys_idev;
1998 
1999         idev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP) | BIT_MASK(EV_REL);
2000 
2001         idev->keybit[BIT_WORD(BTN_MOUSE)] =
2002                 BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_RIGHT);
2003         idev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y) |
2004                 BIT_MASK(REL_WHEEL);
2005 
2006         /* panel and/or knob code support */
2007         for (i = 0; key_table[i].hw_code != 0; i++) {
2008                 u32 kc = key_table[i].keycode;
2009                 __set_bit(kc, idev->keybit);
2010         }
2011 
2012         usb_to_input_id(ictx->usbdev_intf0, &idev->id);
2013         idev->dev.parent = ictx->dev;
2014         input_set_drvdata(idev, ictx);
2015 
2016         ret = input_register_device(idev);
2017         if (ret < 0) {
2018                 dev_err(ictx->dev, "input dev register failed\n");
2019                 goto out;
2020         }
2021 
2022         return idev;
2023 
2024 out:
2025         input_free_device(idev);
2026         return NULL;
2027 }
2028 
2029 static struct input_dev *imon_init_touch(struct imon_context *ictx)
2030 {
2031         struct input_dev *touch;
2032         int ret;
2033 
2034         touch = input_allocate_device();
2035         if (!touch)
2036                 goto touch_alloc_failed;
2037 
2038         snprintf(ictx->name_touch, sizeof(ictx->name_touch),
2039                  "iMON USB Touchscreen (%04x:%04x)",
2040                  ictx->vendor, ictx->product);
2041         touch->name = ictx->name_touch;
2042 
2043         usb_make_path(ictx->usbdev_intf1, ictx->phys_touch,
2044                       sizeof(ictx->phys_touch));
2045         strlcat(ictx->phys_touch, "/input2", sizeof(ictx->phys_touch));
2046         touch->phys = ictx->phys_touch;
2047 
2048         touch->evbit[0] =
2049                 BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
2050         touch->keybit[BIT_WORD(BTN_TOUCH)] =
2051                 BIT_MASK(BTN_TOUCH);
2052         input_set_abs_params(touch, ABS_X,
2053                              0x00, 0xfff, 0, 0);
2054         input_set_abs_params(touch, ABS_Y,
2055                              0x00, 0xfff, 0, 0);
2056 
2057         input_set_drvdata(touch, ictx);
2058 
2059         usb_to_input_id(ictx->usbdev_intf1, &touch->id);
2060         touch->dev.parent = ictx->dev;
2061         ret = input_register_device(touch);
2062         if (ret <  0) {
2063                 dev_info(ictx->dev, "touchscreen input dev register failed\n");
2064                 goto touch_register_failed;
2065         }
2066 
2067         return touch;
2068 
2069 touch_register_failed:
2070         input_free_device(touch);
2071 
2072 touch_alloc_failed:
2073         return NULL;
2074 }
2075 
2076 static bool imon_find_endpoints(struct imon_context *ictx,
2077                                 struct usb_host_interface *iface_desc)
2078 {
2079         struct usb_endpoint_descriptor *ep;
2080         struct usb_endpoint_descriptor *rx_endpoint = NULL;
2081         struct usb_endpoint_descriptor *tx_endpoint = NULL;
2082         int ifnum = iface_desc->desc.bInterfaceNumber;
2083         int num_endpts = iface_desc->desc.bNumEndpoints;
2084         int i, ep_dir, ep_type;
2085         bool ir_ep_found = false;
2086         bool display_ep_found = false;
2087         bool tx_control = false;
2088 
2089         /*
2090          * Scan the endpoint list and set:
2091          *      first input endpoint = IR endpoint
2092          *      first output endpoint = display endpoint
2093          */
2094         for (i = 0; i < num_endpts && !(ir_ep_found && display_ep_found); ++i) {
2095                 ep = &iface_desc->endpoint[i].desc;
2096                 ep_dir = ep->bEndpointAddress & USB_ENDPOINT_DIR_MASK;
2097                 ep_type = usb_endpoint_type(ep);
2098 
2099                 if (!ir_ep_found && ep_dir == USB_DIR_IN &&
2100                     ep_type == USB_ENDPOINT_XFER_INT) {
2101 
2102                         rx_endpoint = ep;
2103                         ir_ep_found = true;
2104                         dev_dbg(ictx->dev, "%s: found IR endpoint\n", __func__);
2105 
2106                 } else if (!display_ep_found && ep_dir == USB_DIR_OUT &&
2107                            ep_type == USB_ENDPOINT_XFER_INT) {
2108                         tx_endpoint = ep;
2109                         display_ep_found = true;
2110                         dev_dbg(ictx->dev, "%s: found display endpoint\n", __func__);
2111                 }
2112         }
2113 
2114         if (ifnum == 0) {
2115                 ictx->rx_endpoint_intf0 = rx_endpoint;
2116                 /*
2117                  * tx is used to send characters to lcd/vfd, associate RF
2118                  * remotes, set IR protocol, and maybe more...
2119                  */
2120                 ictx->tx_endpoint = tx_endpoint;
2121         } else {
2122                 ictx->rx_endpoint_intf1 = rx_endpoint;
2123         }
2124 
2125         /*
2126          * If we didn't find a display endpoint, this is probably one of the
2127          * newer iMON devices that use control urb instead of interrupt
2128          */
2129         if (!display_ep_found) {
2130                 tx_control = true;
2131                 display_ep_found = true;
2132                 dev_dbg(ictx->dev, "%s: device uses control endpoint, not interface OUT endpoint\n",
2133                         __func__);
2134         }
2135 
2136         /*
2137          * Some iMON receivers have no display. Unfortunately, it seems
2138          * that SoundGraph recycles device IDs between devices both with
2139          * and without... :\
2140          */
2141         if (ictx->display_type == IMON_DISPLAY_TYPE_NONE) {
2142                 display_ep_found = false;
2143                 dev_dbg(ictx->dev, "%s: device has no display\n", __func__);
2144         }
2145 
2146         /*
2147          * iMON Touch devices have a VGA touchscreen, but no "display", as
2148          * that refers to e.g. /dev/lcd0 (a character device LCD or VFD).
2149          */
2150         if (ictx->display_type == IMON_DISPLAY_TYPE_VGA) {
2151                 display_ep_found = false;
2152                 dev_dbg(ictx->dev, "%s: iMON Touch device found\n", __func__);
2153         }
2154 
2155         /* Input endpoint is mandatory */
2156         if (!ir_ep_found)
2157                 pr_err("no valid input (IR) endpoint found\n");
2158 
2159         ictx->tx_control = tx_control;
2160 
2161         if (display_ep_found)
2162                 ictx->display_supported = true;
2163 
2164         return ir_ep_found;
2165 
2166 }
2167 
2168 static struct imon_context *imon_init_intf0(struct usb_interface *intf,
2169                                             const struct usb_device_id *id)
2170 {
2171         struct imon_context *ictx;
2172         struct urb *rx_urb;
2173         struct urb *tx_urb;
2174         struct device *dev = &intf->dev;
2175         struct usb_host_interface *iface_desc;
2176         int ret = -ENOMEM;
2177 
2178         ictx = kzalloc(sizeof(*ictx), GFP_KERNEL);
2179         if (!ictx)
2180                 goto exit;
2181 
2182         rx_urb = usb_alloc_urb(0, GFP_KERNEL);
2183         if (!rx_urb)
2184                 goto rx_urb_alloc_failed;
2185         tx_urb = usb_alloc_urb(0, GFP_KERNEL);
2186         if (!tx_urb)
2187                 goto tx_urb_alloc_failed;
2188 
2189         mutex_init(&ictx->lock);
2190         spin_lock_init(&ictx->kc_lock);
2191 
2192         mutex_lock(&ictx->lock);
2193 
2194         ictx->dev = dev;
2195         ictx->usbdev_intf0 = usb_get_dev(interface_to_usbdev(intf));
2196         ictx->rx_urb_intf0 = rx_urb;
2197         ictx->tx_urb = tx_urb;
2198         ictx->rf_device = false;
2199 
2200         init_completion(&ictx->tx.finished);
2201 
2202         ictx->vendor  = le16_to_cpu(ictx->usbdev_intf0->descriptor.idVendor);
2203         ictx->product = le16_to_cpu(ictx->usbdev_intf0->descriptor.idProduct);
2204 
2205         /* save drive info for later accessing the panel/knob key table */
2206         ictx->dev_descr = (struct imon_usb_dev_descr *)id->driver_info;
2207         /* default send_packet delay is 5ms but some devices need more */
2208         ictx->send_packet_delay = ictx->dev_descr->flags &
2209                                   IMON_NEED_20MS_PKT_DELAY ? 20 : 5;
2210 
2211         ret = -ENODEV;
2212         iface_desc = intf->cur_altsetting;
2213         if (!imon_find_endpoints(ictx, iface_desc)) {
2214                 goto find_endpoint_failed;
2215         }
2216 
2217         usb_fill_int_urb(ictx->rx_urb_intf0, ictx->usbdev_intf0,
2218                 usb_rcvintpipe(ictx->usbdev_intf0,
2219                         ictx->rx_endpoint_intf0->bEndpointAddress),
2220                 ictx->usb_rx_buf, sizeof(ictx->usb_rx_buf),
2221                 usb_rx_callback_intf0, ictx,
2222                 ictx->rx_endpoint_intf0->bInterval);
2223 
2224         ret = usb_submit_urb(ictx->rx_urb_intf0, GFP_KERNEL);
2225         if (ret) {
2226                 pr_err("usb_submit_urb failed for intf0 (%d)\n", ret);
2227                 goto urb_submit_failed;
2228         }
2229 
2230         ictx->idev = imon_init_idev(ictx);
2231         if (!ictx->idev) {
2232                 dev_err(dev, "%s: input device setup failed\n", __func__);
2233                 goto idev_setup_failed;
2234         }
2235 
2236         ictx->rdev = imon_init_rdev(ictx);
2237         if (!ictx->rdev) {
2238                 dev_err(dev, "%s: rc device setup failed\n", __func__);
2239                 goto rdev_setup_failed;
2240         }
2241 
2242         ictx->dev_present_intf0 = true;
2243 
2244         mutex_unlock(&ictx->lock);
2245         return ictx;
2246 
2247 rdev_setup_failed:
2248         input_unregister_device(ictx->idev);
2249 idev_setup_failed:
2250         usb_kill_urb(ictx->rx_urb_intf0);
2251 urb_submit_failed:
2252 find_endpoint_failed:
2253         usb_put_dev(ictx->usbdev_intf0);
2254         mutex_unlock(&ictx->lock);
2255         usb_free_urb(tx_urb);
2256 tx_urb_alloc_failed:
2257         usb_free_urb(rx_urb);
2258 rx_urb_alloc_failed:
2259         kfree(ictx);
2260 exit:
2261         dev_err(dev, "unable to initialize intf0, err %d\n", ret);
2262 
2263         return NULL;
2264 }
2265 
2266 static struct imon_context *imon_init_intf1(struct usb_interface *intf,
2267                                             struct imon_context *ictx)
2268 {
2269         struct urb *rx_urb;
2270         struct usb_host_interface *iface_desc;
2271         int ret = -ENOMEM;
2272 
2273         rx_urb = usb_alloc_urb(0, GFP_KERNEL);
2274         if (!rx_urb)
2275                 goto rx_urb_alloc_failed;
2276 
2277         mutex_lock(&ictx->lock);
2278 
2279         if (ictx->display_type == IMON_DISPLAY_TYPE_VGA) {
2280                 timer_setup(&ictx->ttimer, imon_touch_display_timeout, 0);
2281         }
2282 
2283         ictx->usbdev_intf1 = usb_get_dev(interface_to_usbdev(intf));
2284         ictx->rx_urb_intf1 = rx_urb;
2285 
2286         ret = -ENODEV;
2287         iface_desc = intf->cur_altsetting;
2288         if (!imon_find_endpoints(ictx, iface_desc))
2289                 goto find_endpoint_failed;
2290 
2291         if (ictx->display_type == IMON_DISPLAY_TYPE_VGA) {
2292                 ictx->touch = imon_init_touch(ictx);
2293                 if (!ictx->touch)
2294                         goto touch_setup_failed;
2295         } else
2296                 ictx->touch = NULL;
2297 
2298         usb_fill_int_urb(ictx->rx_urb_intf1, ictx->usbdev_intf1,
2299                 usb_rcvintpipe(ictx->usbdev_intf1,
2300                         ictx->rx_endpoint_intf1->bEndpointAddress),
2301                 ictx->usb_rx_buf, sizeof(ictx->usb_rx_buf),
2302                 usb_rx_callback_intf1, ictx,
2303                 ictx->rx_endpoint_intf1->bInterval);
2304 
2305         ret = usb_submit_urb(ictx->rx_urb_intf1, GFP_KERNEL);
2306 
2307         if (ret) {
2308                 pr_err("usb_submit_urb failed for intf1 (%d)\n", ret);
2309                 goto urb_submit_failed;
2310         }
2311 
2312         ictx->dev_present_intf1 = true;
2313 
2314         mutex_unlock(&ictx->lock);
2315         return ictx;
2316 
2317 urb_submit_failed:
2318         if (ictx->touch)
2319                 input_unregister_device(ictx->touch);
2320 touch_setup_failed:
2321 find_endpoint_failed:
2322         usb_put_dev(ictx->usbdev_intf1);
2323         mutex_unlock(&ictx->lock);
2324         usb_free_urb(rx_urb);
2325 rx_urb_alloc_failed:
2326         dev_err(ictx->dev, "unable to initialize intf1, err %d\n", ret);
2327 
2328         return NULL;
2329 }
2330 
2331 static void imon_init_display(struct imon_context *ictx,
2332                               struct usb_interface *intf)
2333 {
2334         int ret;
2335 
2336         dev_dbg(ictx->dev, "Registering iMON display with sysfs\n");
2337 
2338         /* set up sysfs entry for built-in clock */
2339         ret = sysfs_create_group(&intf->dev.kobj, &imon_display_attr_group);
2340         if (ret)
2341                 dev_err(ictx->dev, "Could not create display sysfs entries(%d)",
2342                         ret);
2343 
2344         if (ictx->display_type == IMON_DISPLAY_TYPE_LCD)
2345                 ret = usb_register_dev(intf, &imon_lcd_class);
2346         else
2347                 ret = usb_register_dev(intf, &imon_vfd_class);
2348         if (ret)
2349                 /* Not a fatal error, so ignore */
2350                 dev_info(ictx->dev, "could not get a minor number for display\n");
2351 
2352 }
2353 
2354 /*
2355  * Callback function for USB core API: Probe
2356  */
2357 static int imon_probe(struct usb_interface *interface,
2358                       const struct usb_device_id *id)
2359 {
2360         struct usb_device *usbdev = NULL;
2361         struct usb_host_interface *iface_desc = NULL;
2362         struct usb_interface *first_if;
2363         struct device *dev = &interface->dev;
2364         int ifnum, sysfs_err;
2365         int ret = 0;
2366         struct imon_context *ictx = NULL;
2367         struct imon_context *first_if_ctx = NULL;
2368         u16 vendor, product;
2369 
2370         usbdev     = usb_get_dev(interface_to_usbdev(interface));
2371         iface_desc = interface->cur_altsetting;
2372         ifnum      = iface_desc->desc.bInterfaceNumber;
2373         vendor     = le16_to_cpu(usbdev->descriptor.idVendor);
2374         product    = le16_to_cpu(usbdev->descriptor.idProduct);
2375 
2376         dev_dbg(dev, "%s: found iMON device (%04x:%04x, intf%d)\n",
2377                 __func__, vendor, product, ifnum);
2378 
2379         /* prevent races probing devices w/multiple interfaces */
2380         mutex_lock(&driver_lock);
2381 
2382         first_if = usb_ifnum_to_if(usbdev, 0);
2383         if (!first_if) {
2384                 ret = -ENODEV;
2385                 goto fail;
2386         }
2387 
2388         first_if_ctx = usb_get_intfdata(first_if);
2389 
2390         if (ifnum == 0) {
2391                 ictx = imon_init_intf0(interface, id);
2392                 if (!ictx) {
2393                         pr_err("failed to initialize context!\n");
2394                         ret = -ENODEV;
2395                         goto fail;
2396                 }
2397 
2398         } else {
2399                 /* this is the secondary interface on the device */
2400 
2401                 /* fail early if first intf failed to register */
2402                 if (!first_if_ctx) {
2403                         ret = -ENODEV;
2404                         goto fail;
2405                 }
2406 
2407                 ictx = imon_init_intf1(interface, first_if_ctx);
2408                 if (!ictx) {
2409                         pr_err("failed to attach to context!\n");
2410                         ret = -ENODEV;
2411                         goto fail;
2412                 }
2413 
2414         }
2415 
2416         usb_set_intfdata(interface, ictx);
2417 
2418         if (ifnum == 0) {
2419                 mutex_lock(&ictx->lock);
2420 
2421                 if (product == 0xffdc && ictx->rf_device) {
2422                         sysfs_err = sysfs_create_group(&interface->dev.kobj,
2423                                                        &imon_rf_attr_group);
2424                         if (sysfs_err)
2425                                 pr_err("Could not create RF sysfs entries(%d)\n",
2426                                        sysfs_err);
2427                 }
2428 
2429                 if (ictx->display_supported)
2430                         imon_init_display(ictx, interface);
2431 
2432                 mutex_unlock(&ictx->lock);
2433         }
2434 
2435         dev_info(dev, "iMON device (%04x:%04x, intf%d) on usb<%d:%d> initialized\n",
2436                  vendor, product, ifnum,
2437                  usbdev->bus->busnum, usbdev->devnum);
2438 
2439         mutex_unlock(&driver_lock);
2440         usb_put_dev(usbdev);
2441 
2442         return 0;
2443 
2444 fail:
2445         mutex_unlock(&driver_lock);
2446         usb_put_dev(usbdev);
2447         dev_err(dev, "unable to register, err %d\n", ret);
2448 
2449         return ret;
2450 }
2451 
2452 /*
2453  * Callback function for USB core API: disconnect
2454  */
2455 static void imon_disconnect(struct usb_interface *interface)
2456 {
2457         struct imon_context *ictx;
2458         struct device *dev;
2459         int ifnum;
2460 
2461         /* prevent races with multi-interface device probing and display_open */
2462         mutex_lock(&driver_lock);
2463 
2464         ictx = usb_get_intfdata(interface);
2465         dev = ictx->dev;
2466         ifnum = interface->cur_altsetting->desc.bInterfaceNumber;
2467 
2468         /*
2469          * sysfs_remove_group is safe to call even if sysfs_create_group
2470          * hasn't been called
2471          */
2472         sysfs_remove_group(&interface->dev.kobj, &imon_display_attr_group);
2473         sysfs_remove_group(&interface->dev.kobj, &imon_rf_attr_group);
2474 
2475         usb_set_intfdata(interface, NULL);
2476 
2477         /* Abort ongoing write */
2478         if (ictx->tx.busy) {
2479                 usb_kill_urb(ictx->tx_urb);
2480                 complete(&ictx->tx.finished);
2481         }
2482 
2483         if (ifnum == 0) {
2484                 ictx->dev_present_intf0 = false;
2485                 usb_kill_urb(ictx->rx_urb_intf0);
2486                 usb_put_dev(ictx->usbdev_intf0);
2487                 input_unregister_device(ictx->idev);
2488                 rc_unregister_device(ictx->rdev);
2489                 if (ictx->display_supported) {
2490                         if (ictx->display_type == IMON_DISPLAY_TYPE_LCD)
2491                                 usb_deregister_dev(interface, &imon_lcd_class);
2492                         else if (ictx->display_type == IMON_DISPLAY_TYPE_VFD)
2493                                 usb_deregister_dev(interface, &imon_vfd_class);
2494                 }
2495         } else {
2496                 ictx->dev_present_intf1 = false;
2497                 usb_kill_urb(ictx->rx_urb_intf1);
2498                 usb_put_dev(ictx->usbdev_intf1);
2499                 if (ictx->display_type == IMON_DISPLAY_TYPE_VGA) {
2500                         input_unregister_device(ictx->touch);
2501                         del_timer_sync(&ictx->ttimer);
2502                 }
2503         }
2504 
2505         if (!ictx->dev_present_intf0 && !ictx->dev_present_intf1)
2506                 free_imon_context(ictx);
2507 
2508         mutex_unlock(&driver_lock);
2509 
2510         dev_dbg(dev, "%s: iMON device (intf%d) disconnected\n",
2511                 __func__, ifnum);
2512 }
2513 
2514 static int imon_suspend(struct usb_interface *intf, pm_message_t message)
2515 {
2516         struct imon_context *ictx = usb_get_intfdata(intf);
2517         int ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
2518 
2519         if (ifnum == 0)
2520                 usb_kill_urb(ictx->rx_urb_intf0);
2521         else
2522                 usb_kill_urb(ictx->rx_urb_intf1);
2523 
2524         return 0;
2525 }
2526 
2527 static int imon_resume(struct usb_interface *intf)
2528 {
2529         int rc = 0;
2530         struct imon_context *ictx = usb_get_intfdata(intf);
2531         int ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
2532 
2533         if (ifnum == 0) {
2534                 usb_fill_int_urb(ictx->rx_urb_intf0, ictx->usbdev_intf0,
2535                         usb_rcvintpipe(ictx->usbdev_intf0,
2536                                 ictx->rx_endpoint_intf0->bEndpointAddress),
2537                         ictx->usb_rx_buf, sizeof(ictx->usb_rx_buf),
2538                         usb_rx_callback_intf0, ictx,
2539                         ictx->rx_endpoint_intf0->bInterval);
2540 
2541                 rc = usb_submit_urb(ictx->rx_urb_intf0, GFP_ATOMIC);
2542 
2543         } else {
2544                 usb_fill_int_urb(ictx->rx_urb_intf1, ictx->usbdev_intf1,
2545                         usb_rcvintpipe(ictx->usbdev_intf1,
2546                                 ictx->rx_endpoint_intf1->bEndpointAddress),
2547                         ictx->usb_rx_buf, sizeof(ictx->usb_rx_buf),
2548                         usb_rx_callback_intf1, ictx,
2549                         ictx->rx_endpoint_intf1->bInterval);
2550 
2551                 rc = usb_submit_urb(ictx->rx_urb_intf1, GFP_ATOMIC);
2552         }
2553 
2554         return rc;
2555 }
2556 
2557 module_usb_driver(imon_driver);
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/media/rc/imon.c

DEFINITIONS
