drivers/media/dvb/dvb-usb/dvb-usb-remote.c

   1 /* dvb-usb-remote.c is part of the DVB USB library.
   2  *
   3  * Copyright (C) 2004-6 Patrick Boettcher (patrick.boettcher@desy.de)
   4  * see dvb-usb-init.c for copyright information.
   5  *
   6  * This file contains functions for initializing the input-device and for handling remote-control-queries.
   7  */
   8 #include "dvb-usb-common.h"
   9 #include <linux/usb/input.h>
  10
  11 static int legacy_dvb_usb_getkeycode(struct input_dev *dev,
  12                                 unsigned int scancode, unsigned int *keycode)
  13 {
  14         struct dvb_usb_device *d = input_get_drvdata(dev);
  15
  16         struct ir_scancode *keymap = d->props.rc.legacy.rc_key_map;
  17         int i;
  18
  19         /* See if we can match the raw key code. */
  20         for (i = 0; i < d->props.rc.legacy.rc_key_map_size; i++)
  21                 if (keymap[i].scancode == scancode) {
  22                         *keycode = keymap[i].keycode;
  23                         return 0;
  24                 }
  25
  26         /*
  27          * If is there extra space, returns KEY_RESERVED,
  28          * otherwise, input core won't let legacy_dvb_usb_setkeycode
  29          * to work
  30          */
  31         for (i = 0; i < d->props.rc.legacy.rc_key_map_size; i++)
  32                 if (keymap[i].keycode == KEY_RESERVED ||
  33                     keymap[i].keycode == KEY_UNKNOWN) {
  34                         *keycode = KEY_RESERVED;
  35                         return 0;
  36                 }
  37
  38         return -EINVAL;
  39 }
  40
  41 static int legacy_dvb_usb_setkeycode(struct input_dev *dev,
  42                                 unsigned int scancode, unsigned int keycode)
  43 {
  44         struct dvb_usb_device *d = input_get_drvdata(dev);
  45
  46         struct ir_scancode *keymap = d->props.rc.legacy.rc_key_map;
  47         int i;
  48
  49         /* Search if it is replacing an existing keycode */
  50         for (i = 0; i < d->props.rc.legacy.rc_key_map_size; i++)
  51                 if (keymap[i].scancode == scancode) {
  52                         keymap[i].keycode = keycode;
  53                         return 0;
  54                 }
  55
  56         /* Search if is there a clean entry. If so, use it */
  57         for (i = 0; i < d->props.rc.legacy.rc_key_map_size; i++)
  58                 if (keymap[i].keycode == KEY_RESERVED ||
  59                     keymap[i].keycode == KEY_UNKNOWN) {
  60                         keymap[i].scancode = scancode;
  61                         keymap[i].keycode = keycode;
  62                         return 0;
  63                 }
  64
  65         /*
  66          * FIXME: Currently, it is not possible to increase the size of
  67          * scancode table. For it to happen, one possibility
  68          * would be to allocate a table with key_map_size + 1,
  69          * copying data, appending the new key on it, and freeing
  70          * the old one - or maybe just allocating some spare space
  71          */
  72
  73         return -EINVAL;
  74 }
  75
  76 /* Remote-control poll function - called every dib->rc_query_interval ms to see
  77  * whether the remote control has received anything.
  78  *
  79  * TODO: Fix the repeat rate of the input device.
  80  */
  81 static void legacy_dvb_usb_read_remote_control(struct work_struct *work)
  82 {
  83         struct dvb_usb_device *d =
  84                 container_of(work, struct dvb_usb_device, rc_query_work.work);
  85         u32 event;
  86         int state;
  87
  88         /* TODO: need a lock here.  We can simply skip checking for the remote control
  89            if we're busy. */
  90
  91         /* when the parameter has been set to 1 via sysfs while the driver was running */
  92         if (dvb_usb_disable_rc_polling)
  93                 return;
  94
  95         if (d->props.rc.legacy.rc_query(d,&event,&state)) {
  96                 err("error while querying for an remote control event.");
  97                 goto schedule;
  98         }
  99
 100
 101         switch (state) {
 102                 case REMOTE_NO_KEY_PRESSED:
 103                         break;
 104                 case REMOTE_KEY_PRESSED:
 105                         deb_rc("key pressed\n");
 106                         d->last_event = event;
 107                 case REMOTE_KEY_REPEAT:
 108                         deb_rc("key repeated\n");
 109                         input_event(d->rc_input_dev, EV_KEY, event, 1);
 110                         input_sync(d->rc_input_dev);
 111                         input_event(d->rc_input_dev, EV_KEY, d->last_event, 0);
 112                         input_sync(d->rc_input_dev);
 113                         break;
 114                 default:
 115                         break;
 116         }
 117
 118 /* improved repeat handling ???
 119         switch (state) {
 120                 case REMOTE_NO_KEY_PRESSED:
 121                         deb_rc("NO KEY PRESSED\n");
 122                         if (d->last_state != REMOTE_NO_KEY_PRESSED) {
 123                                 deb_rc("releasing event %d\n",d->last_event);
 124                                 input_event(d->rc_input_dev, EV_KEY, d->last_event, 0);
 125                                 input_sync(d->rc_input_dev);
 126                         }
 127                         d->last_state = REMOTE_NO_KEY_PRESSED;
 128                         d->last_event = 0;
 129                         break;
 130                 case REMOTE_KEY_PRESSED:
 131                         deb_rc("KEY PRESSED\n");
 132                         deb_rc("pressing event %d\n",event);
 133
 134                         input_event(d->rc_input_dev, EV_KEY, event, 1);
 135                         input_sync(d->rc_input_dev);
 136
 137                         d->last_event = event;
 138                         d->last_state = REMOTE_KEY_PRESSED;
 139                         break;
 140                 case REMOTE_KEY_REPEAT:
 141                         deb_rc("KEY_REPEAT\n");
 142                         if (d->last_state != REMOTE_NO_KEY_PRESSED) {
 143                                 deb_rc("repeating event %d\n",d->last_event);
 144                                 input_event(d->rc_input_dev, EV_KEY, d->last_event, 2);
 145                                 input_sync(d->rc_input_dev);
 146                                 d->last_state = REMOTE_KEY_REPEAT;
 147                         }
 148                 default:
 149                         break;
 150         }
 151 */
 152
 153 schedule:
 154         schedule_delayed_work(&d->rc_query_work,msecs_to_jiffies(d->props.rc.legacy.rc_interval));
 155 }
 156
 157 static int legacy_dvb_usb_remote_init(struct dvb_usb_device *d,
 158                                       struct input_dev *input_dev)
 159 {
 160         int i, err, rc_interval;
 161
 162         input_dev->getkeycode = legacy_dvb_usb_getkeycode;
 163         input_dev->setkeycode = legacy_dvb_usb_setkeycode;
 164
 165         /* set the bits for the keys */
 166         deb_rc("key map size: %d\n", d->props.rc.legacy.rc_key_map_size);
 167         for (i = 0; i < d->props.rc.legacy.rc_key_map_size; i++) {
 168                 deb_rc("setting bit for event %d item %d\n",
 169                         d->props.rc.legacy.rc_key_map[i].keycode, i);
 170                 set_bit(d->props.rc.legacy.rc_key_map[i].keycode, input_dev->keybit);
 171         }
 172
 173         /* setting these two values to non-zero, we have to manage key repeats */
 174         input_dev->rep[REP_PERIOD] = d->props.rc.legacy.rc_interval;
 175         input_dev->rep[REP_DELAY]  = d->props.rc.legacy.rc_interval + 150;
 176
 177         input_set_drvdata(input_dev, d);
 178
 179         err = input_register_device(input_dev);
 180         if (err)
 181                 input_free_device(input_dev);
 182
 183         rc_interval = d->props.rc.legacy.rc_interval;
 184
 185         INIT_DELAYED_WORK(&d->rc_query_work, legacy_dvb_usb_read_remote_control);
 186
 187         info("schedule remote query interval to %d msecs.", rc_interval);
 188         schedule_delayed_work(&d->rc_query_work,
 189                               msecs_to_jiffies(rc_interval));
 190
 191         d->state |= DVB_USB_STATE_REMOTE;
 192
 193         return err;
 194 }
 195
 196 /* Remote-control poll function - called every dib->rc_query_interval ms to see
 197  * whether the remote control has received anything.
 198  *
 199  * TODO: Fix the repeat rate of the input device.
 200  */
 201 static void dvb_usb_read_remote_control(struct work_struct *work)
 202 {
 203         struct dvb_usb_device *d =
 204                 container_of(work, struct dvb_usb_device, rc_query_work.work);
 205         int err;
 206
 207         /* TODO: need a lock here.  We can simply skip checking for the remote control
 208            if we're busy. */
 209
 210         /* when the parameter has been set to 1 via sysfs while the
 211          * driver was running, or when bulk mode is enabled after IR init
 212          */
 213         if (dvb_usb_disable_rc_polling || d->props.rc.core.bulk_mode)
 214                 return;
 215
 216         err = d->props.rc.core.rc_query(d);
 217         if (err)
 218                 err("error %d while querying for an remote control event.", err);
 219
 220         schedule_delayed_work(&d->rc_query_work,
 221                               msecs_to_jiffies(d->props.rc.core.rc_interval));
 222 }
 223
 224 static int rc_core_dvb_usb_remote_init(struct dvb_usb_device *d,
 225                                        struct input_dev *input_dev)
 226 {
 227         int err, rc_interval;
 228
 229         d->props.rc.core.rc_props.priv = d;
 230         err = ir_input_register(input_dev,
 231                                  d->props.rc.core.rc_codes,
 232                                  &d->props.rc.core.rc_props,
 233                                  d->props.rc.core.module_name);
 234         if (err < 0)
 235                 return err;
 236
 237         if (!d->props.rc.core.rc_query || d->props.rc.core.bulk_mode)
 238                 return 0;
 239
 240         /* Polling mode - initialize a work queue for handling it */
 241         INIT_DELAYED_WORK(&d->rc_query_work, dvb_usb_read_remote_control);
 242
 243         rc_interval = d->props.rc.core.rc_interval;
 244
 245         info("schedule remote query interval to %d msecs.", rc_interval);
 246         schedule_delayed_work(&d->rc_query_work,
 247                               msecs_to_jiffies(rc_interval));
 248
 249         return 0;
 250 }
 251
 252 int dvb_usb_remote_init(struct dvb_usb_device *d)
 253 {
 254         struct input_dev *input_dev;
 255         int err;
 256
 257         if (dvb_usb_disable_rc_polling)
 258                 return 0;
 259
 260         if (d->props.rc.legacy.rc_key_map && d->props.rc.legacy.rc_query)
 261                 d->props.rc.mode = DVB_RC_LEGACY;
 262         else if (d->props.rc.core.rc_codes)
 263                 d->props.rc.mode = DVB_RC_CORE;
 264         else
 265                 return 0;
 266
 267         usb_make_path(d->udev, d->rc_phys, sizeof(d->rc_phys));
 268         strlcat(d->rc_phys, "/ir0", sizeof(d->rc_phys));
 269
 270         input_dev = input_allocate_device();
 271         if (!input_dev)
 272                 return -ENOMEM;
 273
 274         input_dev->evbit[0] = BIT_MASK(EV_KEY);
 275         input_dev->name = "IR-receiver inside an USB DVB receiver";
 276         input_dev->phys = d->rc_phys;
 277         usb_to_input_id(d->udev, &input_dev->id);
 278         input_dev->dev.parent = &d->udev->dev;
 279
 280         /* Start the remote-control polling. */
 281         if (d->props.rc.legacy.rc_interval < 40)
 282                 d->props.rc.legacy.rc_interval = 100; /* default */
 283
 284         d->rc_input_dev = input_dev;
 285
 286         if (d->props.rc.mode == DVB_RC_LEGACY)
 287                 err = legacy_dvb_usb_remote_init(d, input_dev);
 288         else
 289                 err = rc_core_dvb_usb_remote_init(d, input_dev);
 290         if (err)
 291                 return err;
 292
 293         d->state |= DVB_USB_STATE_REMOTE;
 294
 295         return 0;
 296 }
 297
 298 int dvb_usb_remote_exit(struct dvb_usb_device *d)
 299 {
 300         if (d->state & DVB_USB_STATE_REMOTE) {
 301                 cancel_rearming_delayed_work(&d->rc_query_work);
 302                 flush_scheduled_work();
 303                 if (d->props.rc.mode == DVB_RC_LEGACY)
 304                         input_unregister_device(d->rc_input_dev);
 305                 else
 306                         ir_input_unregister(d->rc_input_dev);
 307         }
 308         d->state &= ~DVB_USB_STATE_REMOTE;
 309         return 0;
 310 }
 311
 312 #define DVB_USB_RC_NEC_EMPTY           0x00
 313 #define DVB_USB_RC_NEC_KEY_PRESSED     0x01
 314 #define DVB_USB_RC_NEC_KEY_REPEATED    0x02
 315 int dvb_usb_nec_rc_key_to_event(struct dvb_usb_device *d,
 316                 u8 keybuf[5], u32 *event, int *state)
 317 {
 318         int i;
 319         struct ir_scancode *keymap = d->props.rc.legacy.rc_key_map;
 320         *event = 0;
 321         *state = REMOTE_NO_KEY_PRESSED;
 322         switch (keybuf[0]) {
 323                 case DVB_USB_RC_NEC_EMPTY:
 324                         break;
 325                 case DVB_USB_RC_NEC_KEY_PRESSED:
 326                         if ((u8) ~keybuf[1] != keybuf[2] ||
 327                                 (u8) ~keybuf[3] != keybuf[4]) {
 328                                 deb_err("remote control checksum failed.\n");
 329                                 break;
 330                         }
 331                         /* See if we can match the raw key code. */
 332                         for (i = 0; i < d->props.rc.legacy.rc_key_map_size; i++)
 333                                 if (rc5_custom(&keymap[i]) == keybuf[1] &&
 334                                         rc5_data(&keymap[i]) == keybuf[3]) {
 335                                         *event = keymap[i].keycode;
 336                                         *state = REMOTE_KEY_PRESSED;
 337                                         return 0;
 338                                 }
 339                         deb_err("key mapping failed - no appropriate key found in keymapping\n");
 340                         break;
 341                 case DVB_USB_RC_NEC_KEY_REPEATED:
 342                         *state = REMOTE_KEY_REPEAT;
 343                         break;
 344                 default:
 345                         deb_err("unknown type of remote status: %d\n",keybuf[0]);
 346                         break;
 347         }
 348         return 0;
 349 }
 350 EXPORT_SYMBOL(dvb_usb_nec_rc_key_to_event);