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 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 dvb_usb_rc_key *keymap = d->props.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_key_map_size; i++)
  21                 if (keymap[i].scan == scancode) {
  22                         *keycode = keymap[i].event;
  23                         return 0;
  24                 }
  25
  26         /*
  27          * If is there extra space, returns KEY_RESERVED,
  28          * otherwise, input core won't let dvb_usb_setkeycode
  29          * to work
  30          */
  31         for (i = 0; i < d->props.rc_key_map_size; i++)
  32                 if (keymap[i].event == KEY_RESERVED ||
  33                     keymap[i].event == KEY_UNKNOWN) {
  34                         *keycode = KEY_RESERVED;
  35                         return 0;
  36                 }
  37
  38         return -EINVAL;
  39 }
  40
  41 static int 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 dvb_usb_rc_key *keymap = d->props.rc_key_map;
  47         int i;
  48
  49         /* Search if it is replacing an existing keycode */
  50         for (i = 0; i < d->props.rc_key_map_size; i++)
  51                 if (keymap[i].scan == scancode) {
  52                         keymap[i].event = 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_key_map_size; i++)
  58                 if (keymap[i].event == KEY_RESERVED ||
  59                     keymap[i].event == KEY_UNKNOWN) {
  60                         keymap[i].scan = scancode;
  61                         keymap[i].event = 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 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_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_interval));
 155 }
 156
 157 int dvb_usb_remote_init(struct dvb_usb_device *d)
 158 {
 159         struct input_dev *input_dev;
 160         int i;
 161         int err;
 162
 163         if (d->props.rc_key_map == NULL ||
 164                 d->props.rc_query == NULL ||
 165                 dvb_usb_disable_rc_polling)
 166                 return 0;
 167
 168         usb_make_path(d->udev, d->rc_phys, sizeof(d->rc_phys));
 169         strlcat(d->rc_phys, "/ir0", sizeof(d->rc_phys));
 170
 171         input_dev = input_allocate_device();
 172         if (!input_dev)
 173                 return -ENOMEM;
 174
 175         input_dev->evbit[0] = BIT_MASK(EV_KEY);
 176         input_dev->name = "IR-receiver inside an USB DVB receiver";
 177         input_dev->phys = d->rc_phys;
 178         usb_to_input_id(d->udev, &input_dev->id);
 179         input_dev->dev.parent = &d->udev->dev;
 180         input_dev->getkeycode = dvb_usb_getkeycode;
 181         input_dev->setkeycode = dvb_usb_setkeycode;
 182
 183         /* set the bits for the keys */
 184         deb_rc("key map size: %d\n", d->props.rc_key_map_size);
 185         for (i = 0; i < d->props.rc_key_map_size; i++) {
 186                 deb_rc("setting bit for event %d item %d\n",
 187                         d->props.rc_key_map[i].event, i);
 188                 set_bit(d->props.rc_key_map[i].event, input_dev->keybit);
 189         }
 190
 191         /* Start the remote-control polling. */
 192         if (d->props.rc_interval < 40)
 193                 d->props.rc_interval = 100; /* default */
 194
 195         /* setting these two values to non-zero, we have to manage key repeats */
 196         input_dev->rep[REP_PERIOD] = d->props.rc_interval;
 197         input_dev->rep[REP_DELAY]  = d->props.rc_interval + 150;
 198
 199         input_set_drvdata(input_dev, d);
 200
 201         err = input_register_device(input_dev);
 202         if (err) {
 203                 input_free_device(input_dev);
 204                 return err;
 205         }
 206
 207         d->rc_input_dev = input_dev;
 208
 209         INIT_DELAYED_WORK(&d->rc_query_work, dvb_usb_read_remote_control);
 210
 211         info("schedule remote query interval to %d msecs.", d->props.rc_interval);
 212         schedule_delayed_work(&d->rc_query_work,msecs_to_jiffies(d->props.rc_interval));
 213
 214         d->state |= DVB_USB_STATE_REMOTE;
 215
 216         return 0;
 217 }
 218
 219 int dvb_usb_remote_exit(struct dvb_usb_device *d)
 220 {
 221         if (d->state & DVB_USB_STATE_REMOTE) {
 222                 cancel_rearming_delayed_work(&d->rc_query_work);
 223                 flush_scheduled_work();
 224                 input_unregister_device(d->rc_input_dev);
 225         }
 226         d->state &= ~DVB_USB_STATE_REMOTE;
 227         return 0;
 228 }
 229
 230 #define DVB_USB_RC_NEC_EMPTY           0x00
 231 #define DVB_USB_RC_NEC_KEY_PRESSED     0x01
 232 #define DVB_USB_RC_NEC_KEY_REPEATED    0x02
 233 int dvb_usb_nec_rc_key_to_event(struct dvb_usb_device *d,
 234                 u8 keybuf[5], u32 *event, int *state)
 235 {
 236         int i;
 237         struct dvb_usb_rc_key *keymap = d->props.rc_key_map;
 238         *event = 0;
 239         *state = REMOTE_NO_KEY_PRESSED;
 240         switch (keybuf[0]) {
 241                 case DVB_USB_RC_NEC_EMPTY:
 242                         break;
 243                 case DVB_USB_RC_NEC_KEY_PRESSED:
 244                         if ((u8) ~keybuf[1] != keybuf[2] ||
 245                                 (u8) ~keybuf[3] != keybuf[4]) {
 246                                 deb_err("remote control checksum failed.\n");
 247                                 break;
 248                         }
 249                         /* See if we can match the raw key code. */
 250                         for (i = 0; i < d->props.rc_key_map_size; i++)
 251                                 if (rc5_custom(&keymap[i]) == keybuf[1] &&
 252                                         rc5_data(&keymap[i]) == keybuf[3]) {
 253                                         *event = keymap[i].event;
 254                                         *state = REMOTE_KEY_PRESSED;
 255                                         return 0;
 256                                 }
 257                         deb_err("key mapping failed - no appropriate key found in keymapping\n");
 258                         break;
 259                 case DVB_USB_RC_NEC_KEY_REPEATED:
 260                         *state = REMOTE_KEY_REPEAT;
 261                         break;
 262                 default:
 263                         deb_err("unknown type of remote status: %d\n",keybuf[0]);
 264                         break;
 265         }
 266         return 0;
 267 }
 268 EXPORT_SYMBOL(dvb_usb_nec_rc_key_to_event);