drivers/media/IR/ir-lirc-codec.c

   1 /* ir-lirc-codec.c - ir-core to classic lirc interface bridge
   2  *
   3  * Copyright (C) 2010 by Jarod Wilson <jarod@redhat.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation version 2 of the License.
   8  *
   9  *  This program is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *  GNU General Public License for more details.
  13  */
  14
  15 #include <linux/sched.h>
  16 #include <linux/wait.h>
  17 #include <media/lirc.h>
  18 #include <media/lirc_dev.h>
  19 #include <media/ir-core.h>
  20 #include "ir-core-priv.h"
  21
  22 #define LIRCBUF_SIZE 256
  23
  24 /**
  25  * ir_lirc_decode() - Send raw IR data to lirc_dev to be relayed to the
  26  *                    lircd userspace daemon for decoding.
  27  * @input_dev:  the struct input_dev descriptor of the device
  28  * @duration:   the struct ir_raw_event descriptor of the pulse/space
  29  *
  30  * This function returns -EINVAL if the lirc interfaces aren't wired up.
  31  */
  32 static int ir_lirc_decode(struct input_dev *input_dev, struct ir_raw_event ev)
  33 {
  34         struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
  35         struct lirc_codec *lirc = &ir_dev->raw->lirc;
  36         int sample;
  37
  38         if (!(ir_dev->raw->enabled_protocols & IR_TYPE_LIRC))
  39                 return 0;
  40
  41         if (!ir_dev->raw->lirc.drv || !ir_dev->raw->lirc.drv->rbuf)
  42                 return -EINVAL;
  43
  44         /* Packet start */
  45         if (ev.reset)
  46                 return 0;
  47
  48         /* Carrier reports */
  49         if (ev.carrier_report) {
  50                 sample = LIRC_FREQUENCY(ev.carrier);
  51
  52         /* Packet end */
  53         } else if (ev.timeout) {
  54
  55                 if (lirc->gap)
  56                         return 0;
  57
  58                 lirc->gap_start = ktime_get();
  59                 lirc->gap = true;
  60                 lirc->gap_duration = ev.duration;
  61
  62                 if (!lirc->send_timeout_reports)
  63                         return 0;
  64
  65                 sample = LIRC_TIMEOUT(ev.duration / 1000);
  66
  67         /* Normal sample */
  68         } else {
  69
  70                 if (lirc->gap) {
  71                         int gap_sample;
  72
  73                         lirc->gap_duration += ktime_to_ns(ktime_sub(ktime_get(),
  74                                 lirc->gap_start));
  75
  76                         /* Convert to ms and cap by LIRC_VALUE_MASK */
  77                         do_div(lirc->gap_duration, 1000);
  78                         lirc->gap_duration = min(lirc->gap_duration,
  79                                                         (u64)LIRC_VALUE_MASK);
  80
  81                         gap_sample = LIRC_SPACE(lirc->gap_duration);
  82                         lirc_buffer_write(ir_dev->raw->lirc.drv->rbuf,
  83                                                 (unsigned char *) &gap_sample);
  84                         lirc->gap = false;
  85                 }
  86
  87                 sample = ev.pulse ? LIRC_PULSE(ev.duration / 1000) :
  88                                         LIRC_SPACE(ev.duration / 1000);
  89         }
  90
  91         lirc_buffer_write(ir_dev->raw->lirc.drv->rbuf,
  92                           (unsigned char *) &sample);
  93         wake_up(&ir_dev->raw->lirc.drv->rbuf->wait_poll);
  94
  95         return 0;
  96 }
  97
  98 static ssize_t ir_lirc_transmit_ir(struct file *file, const char *buf,
  99                                    size_t n, loff_t *ppos)
 100 {
 101         struct lirc_codec *lirc;
 102         struct ir_input_dev *ir_dev;
 103         int *txbuf; /* buffer with values to transmit */
 104         int ret = 0, count;
 105
 106         lirc = lirc_get_pdata(file);
 107         if (!lirc)
 108                 return -EFAULT;
 109
 110         if (n % sizeof(int))
 111                 return -EINVAL;
 112
 113         count = n / sizeof(int);
 114         if (count > LIRCBUF_SIZE || count % 2 == 0)
 115                 return -EINVAL;
 116
 117         txbuf = memdup_user(buf, n);
 118         if (IS_ERR(txbuf))
 119                 return PTR_ERR(txbuf);
 120
 121         ir_dev = lirc->ir_dev;
 122         if (!ir_dev) {
 123                 ret = -EFAULT;
 124                 goto out;
 125         }
 126
 127         if (ir_dev->props && ir_dev->props->tx_ir)
 128                 ret = ir_dev->props->tx_ir(ir_dev->props->priv, txbuf, (u32)n);
 129
 130 out:
 131         kfree(txbuf);
 132         return ret;
 133 }
 134
 135 static long ir_lirc_ioctl(struct file *filep, unsigned int cmd,
 136                         unsigned long __user arg)
 137 {
 138         struct lirc_codec *lirc;
 139         struct ir_input_dev *ir_dev;
 140         int ret = 0;
 141         void *drv_data;
 142         __u32 val = 0, tmp;
 143
 144         lirc = lirc_get_pdata(filep);
 145         if (!lirc)
 146                 return -EFAULT;
 147
 148         ir_dev = lirc->ir_dev;
 149         if (!ir_dev || !ir_dev->props || !ir_dev->props->priv)
 150                 return -EFAULT;
 151
 152         drv_data = ir_dev->props->priv;
 153
 154         if (_IOC_DIR(cmd) & _IOC_WRITE) {
 155                 ret = get_user(val, (__u32 *)arg);
 156                 if (ret)
 157                         return ret;
 158         }
 159
 160         switch (cmd) {
 161
 162         /* legacy support */
 163         case LIRC_GET_SEND_MODE:
 164                 val = LIRC_CAN_SEND_PULSE & LIRC_CAN_SEND_MASK;
 165                 break;
 166
 167         case LIRC_SET_SEND_MODE:
 168                 if (val != (LIRC_MODE_PULSE & LIRC_CAN_SEND_MASK))
 169                         return -EINVAL;
 170                 return 0;
 171
 172         /* TX settings */
 173         case LIRC_SET_TRANSMITTER_MASK:
 174                 if (!ir_dev->props->s_tx_mask)
 175                         return -EINVAL;
 176
 177                 return ir_dev->props->s_tx_mask(drv_data, val);
 178
 179         case LIRC_SET_SEND_CARRIER:
 180                 if (!ir_dev->props->s_tx_carrier)
 181                         return -EINVAL;
 182
 183                 return ir_dev->props->s_tx_carrier(drv_data, val);
 184
 185         case LIRC_SET_SEND_DUTY_CYCLE:
 186                 if (!ir_dev->props->s_tx_duty_cycle)
 187                         return -ENOSYS;
 188
 189                 if (val <= 0 || val >= 100)
 190                         return -EINVAL;
 191
 192                 return ir_dev->props->s_tx_duty_cycle(drv_data, val);
 193
 194         /* RX settings */
 195         case LIRC_SET_REC_CARRIER:
 196                 if (!ir_dev->props->s_rx_carrier_range)
 197                         return -ENOSYS;
 198
 199                 if (val <= 0)
 200                         return -EINVAL;
 201
 202                 return ir_dev->props->s_rx_carrier_range(drv_data,
 203                         ir_dev->raw->lirc.carrier_low, val);
 204
 205         case LIRC_SET_REC_CARRIER_RANGE:
 206                 if (val <= 0)
 207                         return -EINVAL;
 208
 209                 ir_dev->raw->lirc.carrier_low = val;
 210                 return 0;
 211
 212         case LIRC_GET_REC_RESOLUTION:
 213                 val = ir_dev->props->rx_resolution;
 214                 break;
 215
 216         case LIRC_SET_WIDEBAND_RECEIVER:
 217                 if (!ir_dev->props->s_learning_mode)
 218                         return -ENOSYS;
 219
 220                 return ir_dev->props->s_learning_mode(drv_data, !!val);
 221
 222         case LIRC_SET_MEASURE_CARRIER_MODE:
 223                 if (!ir_dev->props->s_carrier_report)
 224                         return -ENOSYS;
 225
 226                 return ir_dev->props->s_carrier_report(drv_data, !!val);
 227
 228         /* Generic timeout support */
 229         case LIRC_GET_MIN_TIMEOUT:
 230                 if (!ir_dev->props->max_timeout)
 231                         return -ENOSYS;
 232                 val = ir_dev->props->min_timeout / 1000;
 233                 break;
 234
 235         case LIRC_GET_MAX_TIMEOUT:
 236                 if (!ir_dev->props->max_timeout)
 237                         return -ENOSYS;
 238                 val = ir_dev->props->max_timeout / 1000;
 239                 break;
 240
 241         case LIRC_SET_REC_TIMEOUT:
 242                 if (!ir_dev->props->max_timeout)
 243                         return -ENOSYS;
 244
 245                 tmp = val * 1000;
 246
 247                 if (tmp < ir_dev->props->min_timeout ||
 248                         tmp > ir_dev->props->max_timeout)
 249                                 return -EINVAL;
 250
 251                 ir_dev->props->timeout = tmp;
 252                 break;
 253
 254         case LIRC_SET_REC_TIMEOUT_REPORTS:
 255                 lirc->send_timeout_reports = !!val;
 256                 break;
 257
 258         default:
 259                 return lirc_dev_fop_ioctl(filep, cmd, arg);
 260         }
 261
 262         if (_IOC_DIR(cmd) & _IOC_READ)
 263                 ret = put_user(val, (__u32 *)arg);
 264
 265         return ret;
 266 }
 267
 268 static int ir_lirc_open(void *data)
 269 {
 270         return 0;
 271 }
 272
 273 static void ir_lirc_close(void *data)
 274 {
 275         return;
 276 }
 277
 278 static struct file_operations lirc_fops = {
 279         .owner          = THIS_MODULE,
 280         .write          = ir_lirc_transmit_ir,
 281         .unlocked_ioctl = ir_lirc_ioctl,
 282 #ifdef CONFIG_COMPAT
 283         .compat_ioctl   = ir_lirc_ioctl,
 284 #endif
 285         .read           = lirc_dev_fop_read,
 286         .poll           = lirc_dev_fop_poll,
 287         .open           = lirc_dev_fop_open,
 288         .release        = lirc_dev_fop_close,
 289         .llseek         = no_llseek,
 290 };
 291
 292 static int ir_lirc_register(struct input_dev *input_dev)
 293 {
 294         struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
 295         struct lirc_driver *drv;
 296         struct lirc_buffer *rbuf;
 297         int rc = -ENOMEM;
 298         unsigned long features;
 299
 300         drv = kzalloc(sizeof(struct lirc_driver), GFP_KERNEL);
 301         if (!drv)
 302                 return rc;
 303
 304         rbuf = kzalloc(sizeof(struct lirc_buffer), GFP_KERNEL);
 305         if (!rbuf)
 306                 goto rbuf_alloc_failed;
 307
 308         rc = lirc_buffer_init(rbuf, sizeof(int), LIRCBUF_SIZE);
 309         if (rc)
 310                 goto rbuf_init_failed;
 311
 312         features = LIRC_CAN_REC_MODE2;
 313         if (ir_dev->props->tx_ir) {
 314
 315                 features |= LIRC_CAN_SEND_PULSE;
 316                 if (ir_dev->props->s_tx_mask)
 317                         features |= LIRC_CAN_SET_TRANSMITTER_MASK;
 318                 if (ir_dev->props->s_tx_carrier)
 319                         features |= LIRC_CAN_SET_SEND_CARRIER;
 320
 321                 if (ir_dev->props->s_tx_duty_cycle)
 322                         features |= LIRC_CAN_SET_SEND_DUTY_CYCLE;
 323         }
 324
 325         if (ir_dev->props->s_rx_carrier_range)
 326                 features |= LIRC_CAN_SET_REC_CARRIER |
 327                         LIRC_CAN_SET_REC_CARRIER_RANGE;
 328
 329         if (ir_dev->props->s_learning_mode)
 330                 features |= LIRC_CAN_USE_WIDEBAND_RECEIVER;
 331
 332         if (ir_dev->props->s_carrier_report)
 333                 features |= LIRC_CAN_MEASURE_CARRIER;
 334
 335
 336         if (ir_dev->props->max_timeout)
 337                 features |= LIRC_CAN_SET_REC_TIMEOUT;
 338
 339
 340         snprintf(drv->name, sizeof(drv->name), "ir-lirc-codec (%s)",
 341                  ir_dev->driver_name);
 342         drv->minor = -1;
 343         drv->features = features;
 344         drv->data = &ir_dev->raw->lirc;
 345         drv->rbuf = rbuf;
 346         drv->set_use_inc = &ir_lirc_open;
 347         drv->set_use_dec = &ir_lirc_close;
 348         drv->code_length = sizeof(struct ir_raw_event) * 8;
 349         drv->fops = &lirc_fops;
 350         drv->dev = &ir_dev->dev;
 351         drv->owner = THIS_MODULE;
 352
 353         drv->minor = lirc_register_driver(drv);
 354         if (drv->minor < 0) {
 355                 rc = -ENODEV;
 356                 goto lirc_register_failed;
 357         }
 358
 359         ir_dev->raw->lirc.drv = drv;
 360         ir_dev->raw->lirc.ir_dev = ir_dev;
 361         return 0;
 362
 363 lirc_register_failed:
 364 rbuf_init_failed:
 365         kfree(rbuf);
 366 rbuf_alloc_failed:
 367         kfree(drv);
 368
 369         return rc;
 370 }
 371
 372 static int ir_lirc_unregister(struct input_dev *input_dev)
 373 {
 374         struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
 375         struct lirc_codec *lirc = &ir_dev->raw->lirc;
 376
 377         lirc_unregister_driver(lirc->drv->minor);
 378         lirc_buffer_free(lirc->drv->rbuf);
 379         kfree(lirc->drv);
 380
 381         return 0;
 382 }
 383
 384 static struct ir_raw_handler lirc_handler = {
 385         .protocols      = IR_TYPE_LIRC,
 386         .decode         = ir_lirc_decode,
 387         .raw_register   = ir_lirc_register,
 388         .raw_unregister = ir_lirc_unregister,
 389 };
 390
 391 static int __init ir_lirc_codec_init(void)
 392 {
 393         ir_raw_handler_register(&lirc_handler);
 394
 395         printk(KERN_INFO "IR LIRC bridge handler initialized\n");
 396         return 0;
 397 }
 398
 399 static void __exit ir_lirc_codec_exit(void)
 400 {
 401         ir_raw_handler_unregister(&lirc_handler);
 402 }
 403
 404 module_init(ir_lirc_codec_init);
 405 module_exit(ir_lirc_codec_exit);
 406
 407 MODULE_LICENSE("GPL");
 408 MODULE_AUTHOR("Jarod Wilson <jarod@redhat.com>");
 409 MODULE_AUTHOR("Red Hat Inc. (http://www.redhat.com)");
 410 MODULE_DESCRIPTION("LIRC IR handler bridge");