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(struct work_struct *work)
  17 {
  18         struct dvb_usb_device *d =
  19                 container_of(work, struct dvb_usb_device, rc_query_work.work);
  20         u32 event;
  21         int state;
  22
  23         /* TODO: need a lock here.  We can simply skip checking for the remote control
  24            if we're busy. */
  25
  26         /* when the parameter has been set to 1 via sysfs while the driver was running */
  27         if (dvb_usb_disable_rc_polling)
  28                 return;
  29
  30         if (d->props.rc_query(d,&event,&state)) {
  31                 err("error while querying for an remote control event.");
  32                 goto schedule;
  33         }
  34
  35
  36         switch (state) {
  37                 case REMOTE_NO_KEY_PRESSED:
  38                         break;
  39                 case REMOTE_KEY_PRESSED:
  40                         deb_rc("key pressed\n");
  41                         d->last_event = event;
  42                 case REMOTE_KEY_REPEAT:
  43                         deb_rc("key repeated\n");
  44                         input_event(d->rc_input_dev, EV_KEY, event, 1);
  45                         input_event(d->rc_input_dev, EV_KEY, d->last_event, 0);
  46                         input_sync(d->rc_input_dev);
  47                         break;
  48                 default:
  49                         break;
  50         }
  51
  52 /* improved repeat handling ???
  53         switch (state) {
  54                 case REMOTE_NO_KEY_PRESSED:
  55                         deb_rc("NO KEY PRESSED\n");
  56                         if (d->last_state != REMOTE_NO_KEY_PRESSED) {
  57                                 deb_rc("releasing event %d\n",d->last_event);
  58                                 input_event(d->rc_input_dev, EV_KEY, d->last_event, 0);
  59                                 input_sync(d->rc_input_dev);
  60                         }
  61                         d->last_state = REMOTE_NO_KEY_PRESSED;
  62                         d->last_event = 0;
  63                         break;
  64                 case REMOTE_KEY_PRESSED:
  65                         deb_rc("KEY PRESSED\n");
  66                         deb_rc("pressing event %d\n",event);
  67
  68                         input_event(d->rc_input_dev, EV_KEY, event, 1);
  69                         input_sync(d->rc_input_dev);
  70
  71                         d->last_event = event;
  72                         d->last_state = REMOTE_KEY_PRESSED;
  73                         break;
  74                 case REMOTE_KEY_REPEAT:
  75                         deb_rc("KEY_REPEAT\n");
  76                         if (d->last_state != REMOTE_NO_KEY_PRESSED) {
  77                                 deb_rc("repeating event %d\n",d->last_event);
  78                                 input_event(d->rc_input_dev, EV_KEY, d->last_event, 2);
  79                                 input_sync(d->rc_input_dev);
  80                                 d->last_state = REMOTE_KEY_REPEAT;
  81                         }
  82                 default:
  83                         break;
  84         }
  85 */
  86
  87 schedule:
  88         schedule_delayed_work(&d->rc_query_work,msecs_to_jiffies(d->props.rc_interval));
  89 }
  90
  91 int dvb_usb_remote_init(struct dvb_usb_device *d)
  92 {
  93         struct input_dev *input_dev;
  94         int i;
  95         int err;
  96
  97         if (d->props.rc_key_map == NULL ||
  98                 d->props.rc_query == NULL ||
  99                 dvb_usb_disable_rc_polling)
 100                 return 0;
 101
 102         usb_make_path(d->udev, d->rc_phys, sizeof(d->rc_phys));
 103         strlcat(d->rc_phys, "/ir0", sizeof(d->rc_phys));
 104
 105         input_dev = input_allocate_device();
 106         if (!input_dev)
 107                 return -ENOMEM;
 108
 109         input_dev->evbit[0] = BIT(EV_KEY);
 110         input_dev->name = "IR-receiver inside an USB DVB receiver";
 111         input_dev->phys = d->rc_phys;
 112         usb_to_input_id(d->udev, &input_dev->id);
 113         input_dev->cdev.dev = &d->udev->dev;
 114
 115         /* set the bits for the keys */
 116         deb_rc("key map size: %d\n", d->props.rc_key_map_size);
 117         for (i = 0; i < d->props.rc_key_map_size; i++) {
 118                 deb_rc("setting bit for event %d item %d\n",
 119                         d->props.rc_key_map[i].event, i);
 120                 set_bit(d->props.rc_key_map[i].event, input_dev->keybit);
 121         }
 122
 123         /* Start the remote-control polling. */
 124         if (d->props.rc_interval < 40)
 125                 d->props.rc_interval = 100; /* default */
 126
 127         /* setting these two values to non-zero, we have to manage key repeats */
 128         input_dev->rep[REP_PERIOD] = d->props.rc_interval;
 129         input_dev->rep[REP_DELAY]  = d->props.rc_interval + 150;
 130
 131         err = input_register_device(input_dev);
 132         if (err) {
 133                 input_free_device(input_dev);
 134                 return err;
 135         }
 136
 137         d->rc_input_dev = input_dev;
 138
 139         INIT_DELAYED_WORK(&d->rc_query_work, dvb_usb_read_remote_control);
 140
 141         info("schedule remote query interval to %d msecs.", d->props.rc_interval);
 142         schedule_delayed_work(&d->rc_query_work,msecs_to_jiffies(d->props.rc_interval));
 143
 144         d->state |= DVB_USB_STATE_REMOTE;
 145
 146         return 0;
 147 }
 148
 149 int dvb_usb_remote_exit(struct dvb_usb_device *d)
 150 {
 151         if (d->state & DVB_USB_STATE_REMOTE) {
 152                 cancel_rearming_delayed_work(&d->rc_query_work);
 153                 flush_scheduled_work();
 154                 input_unregister_device(d->rc_input_dev);
 155         }
 156         d->state &= ~DVB_USB_STATE_REMOTE;
 157         return 0;
 158 }
 159
 160 #define DVB_USB_RC_NEC_EMPTY           0x00
 161 #define DVB_USB_RC_NEC_KEY_PRESSED     0x01
 162 #define DVB_USB_RC_NEC_KEY_REPEATED    0x02
 163 int dvb_usb_nec_rc_key_to_event(struct dvb_usb_device *d,
 164                 u8 keybuf[5], u32 *event, int *state)
 165 {
 166         int i;
 167         struct dvb_usb_rc_key *keymap = d->props.rc_key_map;
 168         *event = 0;
 169         *state = REMOTE_NO_KEY_PRESSED;
 170         switch (keybuf[0]) {
 171                 case DVB_USB_RC_NEC_EMPTY:
 172                         break;
 173                 case DVB_USB_RC_NEC_KEY_PRESSED:
 174                         if ((u8) ~keybuf[1] != keybuf[2] ||
 175                                 (u8) ~keybuf[3] != keybuf[4]) {
 176                                 deb_err("remote control checksum failed.\n");
 177                                 break;
 178                         }
 179                         /* See if we can match the raw key code. */
 180                         for (i = 0; i < d->props.rc_key_map_size; i++)
 181                                 if (keymap[i].custom == keybuf[1] &&
 182                                         keymap[i].data == keybuf[3]) {
 183                                         *event = keymap[i].event;
 184                                         *state = REMOTE_KEY_PRESSED;
 185                                         return 0;
 186                                 }
 187                         deb_err("key mapping failed - no appropriate key found in keymapping\n");
 188                         break;
 189                 case DVB_USB_RC_NEC_KEY_REPEATED:
 190                         *state = REMOTE_KEY_REPEAT;
 191                         break;
 192                 default:
 193                         deb_err("unkown type of remote status: %d\n",keybuf[0]);
 194                         break;
 195         }
 196         return 0;
 197 }
 198 EXPORT_SYMBOL(dvb_usb_nec_rc_key_to_event);