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dvb-usb-remote.c

/* dvb-usb-remote.c is part of the DVB USB library.
 *
 * Copyright (C) 2004-6 Patrick Boettcher (patrick.boettcher@desy.de)
 * see dvb-usb-init.c for copyright information.
 *
 * This file contains functions for initializing the input-device and for handling remote-control-queries.
 */
#include "dvb-usb-common.h"
#include <linux/usb/input.h>

/* Remote-control poll function - called every dib->rc_query_interval ms to see
 * whether the remote control has received anything.
 *
 * TODO: Fix the repeat rate of the input device.
 */
static void dvb_usb_read_remote_control(struct work_struct *work)
{
      struct dvb_usb_device *d =
            container_of(work, struct dvb_usb_device, rc_query_work.work);
      u32 event;
      int state;

      /* TODO: need a lock here.  We can simply skip checking for the remote control
         if we're busy. */

      /* when the parameter has been set to 1 via sysfs while the driver was running */
      if (dvb_usb_disable_rc_polling)
            return;

      if (d->props.rc_query(d,&event,&state)) {
            err("error while querying for an remote control event.");
            goto schedule;
      }


      switch (state) {
            case REMOTE_NO_KEY_PRESSED:
                  break;
            case REMOTE_KEY_PRESSED:
                  deb_rc("key pressed\n");
                  d->last_event = event;
            case REMOTE_KEY_REPEAT:
                  deb_rc("key repeated\n");
                  input_event(d->rc_input_dev, EV_KEY, event, 1);
                  input_event(d->rc_input_dev, EV_KEY, d->last_event, 0);
                  input_sync(d->rc_input_dev);
                  break;
            default:
                  break;
      }

/* improved repeat handling ???
      switch (state) {
            case REMOTE_NO_KEY_PRESSED:
                  deb_rc("NO KEY PRESSED\n");
                  if (d->last_state != REMOTE_NO_KEY_PRESSED) {
                        deb_rc("releasing event %d\n",d->last_event);
                        input_event(d->rc_input_dev, EV_KEY, d->last_event, 0);
                        input_sync(d->rc_input_dev);
                  }
                  d->last_state = REMOTE_NO_KEY_PRESSED;
                  d->last_event = 0;
                  break;
            case REMOTE_KEY_PRESSED:
                  deb_rc("KEY PRESSED\n");
                  deb_rc("pressing event %d\n",event);

                  input_event(d->rc_input_dev, EV_KEY, event, 1);
                  input_sync(d->rc_input_dev);

                  d->last_event = event;
                  d->last_state = REMOTE_KEY_PRESSED;
                  break;
            case REMOTE_KEY_REPEAT:
                  deb_rc("KEY_REPEAT\n");
                  if (d->last_state != REMOTE_NO_KEY_PRESSED) {
                        deb_rc("repeating event %d\n",d->last_event);
                        input_event(d->rc_input_dev, EV_KEY, d->last_event, 2);
                        input_sync(d->rc_input_dev);
                        d->last_state = REMOTE_KEY_REPEAT;
                  }
            default:
                  break;
      }
*/

schedule:
      schedule_delayed_work(&d->rc_query_work,msecs_to_jiffies(d->props.rc_interval));
}

int dvb_usb_remote_init(struct dvb_usb_device *d)
{
      struct input_dev *input_dev;
      int i;
      int err;

      if (d->props.rc_key_map == NULL ||
            d->props.rc_query == NULL ||
            dvb_usb_disable_rc_polling)
            return 0;

      usb_make_path(d->udev, d->rc_phys, sizeof(d->rc_phys));
      strlcat(d->rc_phys, "/ir0", sizeof(d->rc_phys));

      input_dev = input_allocate_device();
      if (!input_dev)
            return -ENOMEM;

      input_dev->evbit[0] = BIT_MASK(EV_KEY);
      input_dev->name = "IR-receiver inside an USB DVB receiver";
      input_dev->phys = d->rc_phys;
      usb_to_input_id(d->udev, &input_dev->id);
      input_dev->dev.parent = &d->udev->dev;

      /* set the bits for the keys */
      deb_rc("key map size: %d\n", d->props.rc_key_map_size);
      for (i = 0; i < d->props.rc_key_map_size; i++) {
            deb_rc("setting bit for event %d item %d\n",
                  d->props.rc_key_map[i].event, i);
            set_bit(d->props.rc_key_map[i].event, input_dev->keybit);
      }

      /* Start the remote-control polling. */
      if (d->props.rc_interval < 40)
            d->props.rc_interval = 100; /* default */

      /* setting these two values to non-zero, we have to manage key repeats */
      input_dev->rep[REP_PERIOD] = d->props.rc_interval;
      input_dev->rep[REP_DELAY]  = d->props.rc_interval + 150;

      err = input_register_device(input_dev);
      if (err) {
            input_free_device(input_dev);
            return err;
      }

      d->rc_input_dev = input_dev;

      INIT_DELAYED_WORK(&d->rc_query_work, dvb_usb_read_remote_control);

      info("schedule remote query interval to %d msecs.", d->props.rc_interval);
      schedule_delayed_work(&d->rc_query_work,msecs_to_jiffies(d->props.rc_interval));

      d->state |= DVB_USB_STATE_REMOTE;

      return 0;
}

int dvb_usb_remote_exit(struct dvb_usb_device *d)
{
      if (d->state & DVB_USB_STATE_REMOTE) {
            cancel_rearming_delayed_work(&d->rc_query_work);
            flush_scheduled_work();
            input_unregister_device(d->rc_input_dev);
      }
      d->state &= ~DVB_USB_STATE_REMOTE;
      return 0;
}

#define DVB_USB_RC_NEC_EMPTY           0x00
#define DVB_USB_RC_NEC_KEY_PRESSED     0x01
#define DVB_USB_RC_NEC_KEY_REPEATED    0x02
int dvb_usb_nec_rc_key_to_event(struct dvb_usb_device *d,
            u8 keybuf[5], u32 *event, int *state)
{
      int i;
      struct dvb_usb_rc_key *keymap = d->props.rc_key_map;
      *event = 0;
      *state = REMOTE_NO_KEY_PRESSED;
      switch (keybuf[0]) {
            case DVB_USB_RC_NEC_EMPTY:
                  break;
            case DVB_USB_RC_NEC_KEY_PRESSED:
                  if ((u8) ~keybuf[1] != keybuf[2] ||
                        (u8) ~keybuf[3] != keybuf[4]) {
                        deb_err("remote control checksum failed.\n");
                        break;
                  }
                  /* See if we can match the raw key code. */
                  for (i = 0; i < d->props.rc_key_map_size; i++)
                        if (keymap[i].custom == keybuf[1] &&
                              keymap[i].data == keybuf[3]) {
                              *event = keymap[i].event;
                              *state = REMOTE_KEY_PRESSED;
                              return 0;
                        }
                  deb_err("key mapping failed - no appropriate key found in keymapping\n");
                  break;
            case DVB_USB_RC_NEC_KEY_REPEATED:
                  *state = REMOTE_KEY_REPEAT;
                  break;
            default:
                  deb_err("unkown type of remote status: %d\n",keybuf[0]);
                  break;
      }
      return 0;
}
EXPORT_SYMBOL(dvb_usb_nec_rc_key_to_event);

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