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 the input-device and for handling remote-control-queries.
   7  */
   8 #include "dvb-usb-common.h"
   9 #include <linux/usb/input.h>
  10
  11 /* Remote-control poll function - called every dib->rc_query_interval ms to see
  12  * whether the remote control has received anything.
  13  *
  14  * TODO: Fix the repeat rate of the input device.
  15  */
  16 static void dvb_usb_read_remote_control(void *data)
  17 {
  18         struct dvb_usb_device *d = data;
  19         u32 event;
  20         int state;
  21
  22         /* TODO: need a lock here.  We can simply skip checking for the remote control
  23            if we're busy. */
  24
  25         /* when the parameter has been set to 1 via sysfs while the driver was running */
  26         if (dvb_usb_disable_rc_polling)
  27                 return;
  28
  29         if (d->props.rc_query(d,&event,&state)) {
  30                 err("error while querying for an remote control event.");
  31                 goto schedule;
  32         }
  33
  34
  35         switch (state) {
  36                 case REMOTE_NO_KEY_PRESSED:
  37                         break;
  38                 case REMOTE_KEY_PRESSED:
  39                         deb_rc("key pressed\n");
  40                         d->last_event = event;
  41                 case REMOTE_KEY_REPEAT:
  42                         deb_rc("key repeated\n");
  43                         input_event(d->rc_input_dev, EV_KEY, event, 1);
  44                         input_event(d->rc_input_dev, EV_KEY, d->last_event, 0);
  45                         input_sync(d->rc_input_dev);
  46                         break;
  47                 default:
  48                         break;
  49         }
  50
  51 /* improved repeat handling ???
  52         switch (state) {
  53                 case REMOTE_NO_KEY_PRESSED:
  54                         deb_rc("NO KEY PRESSED\n");
  55                         if (d->last_state != REMOTE_NO_KEY_PRESSED) {
  56                                 deb_rc("releasing event %d\n",d->last_event);
  57                                 input_event(d->rc_input_dev, EV_KEY, d->last_event, 0);
  58                                 input_sync(d->rc_input_dev);
  59                         }
  60                         d->last_state = REMOTE_NO_KEY_PRESSED;
  61                         d->last_event = 0;
  62                         break;
  63                 case REMOTE_KEY_PRESSED:
  64                         deb_rc("KEY PRESSED\n");
  65                         deb_rc("pressing event %d\n",event);
  66
  67                         input_event(d->rc_input_dev, EV_KEY, event, 1);
  68                         input_sync(d->rc_input_dev);
  69
  70                         d->last_event = event;
  71                         d->last_state = REMOTE_KEY_PRESSED;
  72                         break;
  73                 case REMOTE_KEY_REPEAT:
  74                         deb_rc("KEY_REPEAT\n");
  75                         if (d->last_state != REMOTE_NO_KEY_PRESSED) {
  76                                 deb_rc("repeating event %d\n",d->last_event);
  77                                 input_event(d->rc_input_dev, EV_KEY, d->last_event, 2);
  78                                 input_sync(d->rc_input_dev);
  79                                 d->last_state = REMOTE_KEY_REPEAT;
  80                         }
  81                 default:
  82                         break;
  83         }
  84 */
  85
  86 schedule:
  87         schedule_delayed_work(&d->rc_query_work,msecs_to_jiffies(d->props.rc_interval));
  88 }
  89
  90 int dvb_usb_remote_init(struct dvb_usb_device *d)
  91 {
  92         int i;
  93
  94         if (d->props.rc_key_map == NULL ||
  95                 d->props.rc_query == NULL ||
  96                 dvb_usb_disable_rc_polling)
  97                 return 0;
  98
  99         usb_make_path(d->udev, d->rc_phys, sizeof(d->rc_phys));
 100         strlcat(d->rc_phys, "/ir0", sizeof(d->rc_phys));
 101
 102         d->rc_input_dev = input_allocate_device();
 103         if (!d->rc_input_dev)
 104                 return -ENOMEM;
 105
 106         d->rc_input_dev->evbit[0] = BIT(EV_KEY);
 107         d->rc_input_dev->keycodesize = sizeof(unsigned char);
 108         d->rc_input_dev->keycodemax = KEY_MAX;
 109         d->rc_input_dev->name = "IR-receiver inside an USB DVB receiver";
 110         d->rc_input_dev->phys = d->rc_phys;
 111         usb_to_input_id(d->udev, &d->rc_input_dev->id);
 112         d->rc_input_dev->cdev.dev = &d->udev->dev;
 113
 114         /* set the bits for the keys */
 115         deb_rc("key map size: %d\n", d->props.rc_key_map_size);
 116         for (i = 0; i < d->props.rc_key_map_size; i++) {
 117                 deb_rc("setting bit for event %d item %d\n",d->props.rc_key_map[i].event, i);
 118                 set_bit(d->props.rc_key_map[i].event, d->rc_input_dev->keybit);
 119         }
 120
 121         /* Start the remote-control polling. */
 122         if (d->props.rc_interval < 40)
 123                 d->props.rc_interval = 100; /* default */
 124
 125         /* setting these two values to non-zero, we have to manage key repeats */
 126         d->rc_input_dev->rep[REP_PERIOD] = d->props.rc_interval;
 127         d->rc_input_dev->rep[REP_DELAY]  = d->props.rc_interval + 150;
 128
 129         input_register_device(d->rc_input_dev);
 130
 131         INIT_WORK(&d->rc_query_work, dvb_usb_read_remote_control, d);
 132
 133         info("schedule remote query interval to %d msecs.", d->props.rc_interval);
 134         schedule_delayed_work(&d->rc_query_work,msecs_to_jiffies(d->props.rc_interval));
 135
 136         d->state |= DVB_USB_STATE_REMOTE;
 137
 138         return 0;
 139 }
 140
 141 int dvb_usb_remote_exit(struct dvb_usb_device *d)
 142 {
 143         if (d->state & DVB_USB_STATE_REMOTE) {
 144                 cancel_delayed_work(&d->rc_query_work);
 145                 flush_scheduled_work();
 146                 input_unregister_device(d->rc_input_dev);
 147         }
 148         d->state &= ~DVB_USB_STATE_REMOTE;
 149         return 0;
 150 }
 151
 152 #define DVB_USB_RC_NEC_EMPTY           0x00
 153 #define DVB_USB_RC_NEC_KEY_PRESSED     0x01
 154 #define DVB_USB_RC_NEC_KEY_REPEATED    0x02
 155 int dvb_usb_nec_rc_key_to_event(struct dvb_usb_device *d,
 156                 u8 keybuf[5], u32 *event, int *state)
 157 {
 158         int i;
 159         struct dvb_usb_rc_key *keymap = d->props.rc_key_map;
 160         *event = 0;
 161         *state = REMOTE_NO_KEY_PRESSED;
 162         switch (keybuf[0]) {
 163                 case DVB_USB_RC_NEC_EMPTY:
 164                         break;
 165                 case DVB_USB_RC_NEC_KEY_PRESSED:
 166                         if ((u8) ~keybuf[1] != keybuf[2] ||
 167                                 (u8) ~keybuf[3] != keybuf[4]) {
 168                                 deb_err("remote control checksum failed.\n");
 169                                 break;
 170                         }
 171                         /* See if we can match the raw key code. */
 172                         for (i = 0; i < d->props.rc_key_map_size; i++)
 173                                 if (keymap[i].custom == keybuf[1] &&
 174                                         keymap[i].data == keybuf[3]) {
 175                                         *event = keymap[i].event;
 176                                         *state = REMOTE_KEY_PRESSED;
 177                                         return 0;
 178                                 }
 179                         deb_err("key mapping failed - no appropriate key found in keymapping\n");
 180                         break;
 181                 case DVB_USB_RC_NEC_KEY_REPEATED:
 182                         *state = REMOTE_KEY_REPEAT;
 183                         break;
 184                 default:
 185                         deb_err("unkown type of remote status: %d\n",keybuf[0]);
 186                         break;
 187         }
 188         return 0;
 189 }
 190 EXPORT_SYMBOL(dvb_usb_nec_rc_key_to_event);