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) 2004-5 Patrick Boettcher (patrick.boettcher@desy.de)
   4  * see dvb-usb-init.c for copyright information.
   5  *
   6  * This file contains functions for initializing the the input-device and for handling remote-control-queries.
   7  */
   8 #include "dvb-usb-common.h"
   9
  10 /* Remote-control poll function - called every dib->rc_query_interval ms to see
  11  * whether the remote control has received anything.
  12  *
  13  * TODO: Fix the repeat rate of the input device.
  14  */
  15 static void dvb_usb_read_remote_control(void *data)
  16 {
  17         struct dvb_usb_device *d = data;
  18         u32 event;
  19         int state;
  20
  21         /* TODO: need a lock here.  We can simply skip checking for the remote control
  22            if we're busy. */
  23
  24         /* when the parameter has been set to 1 via sysfs while the driver was running */
  25         if (dvb_usb_disable_rc_polling)
  26                 return;
  27
  28         if (d->props.rc_query(d,&event,&state)) {
  29                 err("error while querying for an remote control event.");
  30                 goto schedule;
  31         }
  32
  33
  34         switch (state) {
  35                 case REMOTE_NO_KEY_PRESSED:
  36                         break;
  37                 case REMOTE_KEY_PRESSED:
  38                         deb_rc("key pressed\n");
  39                         d->last_event = event;
  40                 case REMOTE_KEY_REPEAT:
  41                         deb_rc("key repeated\n");
  42                         input_event(&d->rc_input_dev, EV_KEY, d->last_event, 1);
  43                         input_event(&d->rc_input_dev, EV_KEY, d->last_event, 0);
  44                         input_sync(&d->rc_input_dev);
  45                         break;
  46                 default:
  47                         break;
  48         }
  49
  50 /* improved repeat handling ???
  51         switch (state) {
  52                 case REMOTE_NO_KEY_PRESSED:
  53                         deb_rc("NO KEY PRESSED\n");
  54                         if (d->last_state != REMOTE_NO_KEY_PRESSED) {
  55                                 deb_rc("releasing event %d\n",d->last_event);
  56                                 input_event(&d->rc_input_dev, EV_KEY, d->last_event, 0);
  57                                 input_sync(&d->rc_input_dev);
  58                         }
  59                         d->last_state = REMOTE_NO_KEY_PRESSED;
  60                         d->last_event = 0;
  61                         break;
  62                 case REMOTE_KEY_PRESSED:
  63                         deb_rc("KEY PRESSED\n");
  64                         deb_rc("pressing event %d\n",event);
  65
  66                         input_event(&d->rc_input_dev, EV_KEY, event, 1);
  67                         input_sync(&d->rc_input_dev);
  68
  69                         d->last_event = event;
  70                         d->last_state = REMOTE_KEY_PRESSED;
  71                         break;
  72                 case REMOTE_KEY_REPEAT:
  73                         deb_rc("KEY_REPEAT\n");
  74                         if (d->last_state != REMOTE_NO_KEY_PRESSED) {
  75                                 deb_rc("repeating event %d\n",d->last_event);
  76                                 input_event(&d->rc_input_dev, EV_KEY, d->last_event, 2);
  77                                 input_sync(&d->rc_input_dev);
  78                                 d->last_state = REMOTE_KEY_REPEAT;
  79                         }
  80                 default:
  81                         break;
  82         }
  83 */
  84
  85 schedule:
  86         schedule_delayed_work(&d->rc_query_work,msecs_to_jiffies(d->props.rc_interval));
  87 }
  88
  89 int dvb_usb_remote_init(struct dvb_usb_device *d)
  90 {
  91         int i;
  92         if (d->props.rc_key_map == NULL ||
  93                 d->props.rc_query == NULL ||
  94                 dvb_usb_disable_rc_polling)
  95                 return 0;
  96
  97         /* Initialise the remote-control structures.*/
  98         init_input_dev(&d->rc_input_dev);
  99
 100         d->rc_input_dev.evbit[0] = BIT(EV_KEY);
 101         d->rc_input_dev.keycodesize = sizeof(unsigned char);
 102         d->rc_input_dev.keycodemax = KEY_MAX;
 103         d->rc_input_dev.name = "IR-receiver inside an USB DVB receiver";
 104
 105         /* set the bits for the keys */
 106         deb_rc("key map size: %d\n",d->props.rc_key_map_size);
 107         for (i = 0; i < d->props.rc_key_map_size; i++) {
 108                 deb_rc("setting bit for event %d item %d\n",d->props.rc_key_map[i].event, i);
 109                 set_bit(d->props.rc_key_map[i].event, d->rc_input_dev.keybit);
 110         }
 111
 112         /* Start the remote-control polling. */
 113         if (d->props.rc_interval < 40)
 114                 d->props.rc_interval = 100; /* default */
 115
 116         /* setting these two values to non-zero, we have to manage key repeats */
 117         d->rc_input_dev.rep[REP_PERIOD] = d->props.rc_interval;
 118         d->rc_input_dev.rep[REP_DELAY]  = d->props.rc_interval + 150;
 119
 120         input_register_device(&d->rc_input_dev);
 121
 122         INIT_WORK(&d->rc_query_work, dvb_usb_read_remote_control, d);
 123
 124         info("schedule remote query interval to %d msecs.",d->props.rc_interval);
 125         schedule_delayed_work(&d->rc_query_work,msecs_to_jiffies(d->props.rc_interval));
 126
 127         d->state |= DVB_USB_STATE_REMOTE;
 128
 129         return 0;
 130 }
 131
 132 int dvb_usb_remote_exit(struct dvb_usb_device *d)
 133 {
 134         if (d->state & DVB_USB_STATE_REMOTE) {
 135                 cancel_delayed_work(&d->rc_query_work);
 136                 flush_scheduled_work();
 137                 input_unregister_device(&d->rc_input_dev);
 138         }
 139         d->state &= ~DVB_USB_STATE_REMOTE;
 140         return 0;
 141 }
 142
 143 #define DVB_USB_RC_NEC_EMPTY           0x00
 144 #define DVB_USB_RC_NEC_KEY_PRESSED     0x01
 145 #define DVB_USB_RC_NEC_KEY_REPEATED    0x02
 146 int dvb_usb_nec_rc_key_to_event(struct dvb_usb_device *d,
 147                 u8 keybuf[5], u32 *event, int *state)
 148 {
 149         int i;
 150         struct dvb_usb_rc_key *keymap = d->props.rc_key_map;
 151         *event = 0;
 152         *state = REMOTE_NO_KEY_PRESSED;
 153         switch (keybuf[0]) {
 154                 case DVB_USB_RC_NEC_EMPTY:
 155                         break;
 156                 case DVB_USB_RC_NEC_KEY_PRESSED:
 157                         if ((u8) ~keybuf[1] != keybuf[2] ||
 158                                 (u8) ~keybuf[3] != keybuf[4]) {
 159                                 deb_err("remote control checksum failed.\n");
 160                                 break;
 161                         }
 162                         /* See if we can match the raw key code. */
 163                         for (i = 0; i < d->props.rc_key_map_size; i++)
 164                                 if (keymap[i].custom == keybuf[1] &&
 165                                         keymap[i].data == keybuf[3]) {
 166                                         *event = keymap[i].event;
 167                                         *state = REMOTE_KEY_PRESSED;
 168                                         return 0;
 169                                 }
 170                         deb_err("key mapping failed - no appropriate key found in keymapping\n");
 171                         break;
 172                 case DVB_USB_RC_NEC_KEY_REPEATED:
 173                         *state = REMOTE_KEY_REPEAT;
 174                         break;
 175                 default:
 176                         deb_err("unkown type of remote status: %d\n",keybuf[0]);
 177                         break;
 178         }
 179         return 0;
 180 }
 181 EXPORT_SYMBOL(dvb_usb_nec_rc_key_to_event);