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         int sample;
  36
  37         if (!(ir_dev->raw->enabled_protocols & IR_TYPE_LIRC))
  38                 return 0;
  39
  40         if (!ir_dev->raw->lirc.drv || !ir_dev->raw->lirc.drv->rbuf)
  41                 return -EINVAL;
  42
  43         if (IS_RESET(ev))
  44                 return 0;
  45
  46         IR_dprintk(2, "LIRC data transfer started (%uus %s)\n",
  47                    TO_US(ev.duration), TO_STR(ev.pulse));
  48
  49         sample = ev.duration / 1000;
  50         if (ev.pulse)
  51                 sample |= PULSE_BIT;
  52
  53         lirc_buffer_write(ir_dev->raw->lirc.drv->rbuf,
  54                           (unsigned char *) &sample);
  55         wake_up(&ir_dev->raw->lirc.drv->rbuf->wait_poll);
  56
  57
  58         return 0;
  59 }
  60
  61 static ssize_t ir_lirc_transmit_ir(struct file *file, const char *buf,
  62                                    size_t n, loff_t *ppos)
  63 {
  64         struct lirc_codec *lirc;
  65         struct ir_input_dev *ir_dev;
  66         int *txbuf; /* buffer with values to transmit */
  67         int ret = 0, count;
  68
  69         lirc = lirc_get_pdata(file);
  70         if (!lirc)
  71                 return -EFAULT;
  72
  73         if (n % sizeof(int))
  74                 return -EINVAL;
  75
  76         count = n / sizeof(int);
  77         if (count > LIRCBUF_SIZE || count % 2 == 0)
  78                 return -EINVAL;
  79
  80         txbuf = memdup_user(buf, n);
  81         if (IS_ERR(txbuf))
  82                 return PTR_ERR(txbuf);
  83
  84         ir_dev = lirc->ir_dev;
  85         if (!ir_dev) {
  86                 ret = -EFAULT;
  87                 goto out;
  88         }
  89
  90         if (ir_dev->props && ir_dev->props->tx_ir)
  91                 ret = ir_dev->props->tx_ir(ir_dev->props->priv, txbuf, (u32)n);
  92
  93 out:
  94         kfree(txbuf);
  95         return ret;
  96 }
  97
  98 static long ir_lirc_ioctl(struct file *filep, unsigned int cmd,
  99                         unsigned long __user arg)
 100 {
 101         struct lirc_codec *lirc;
 102         struct ir_input_dev *ir_dev;
 103         int ret = 0;
 104         void *drv_data;
 105         unsigned long val = 0;
 106
 107         lirc = lirc_get_pdata(filep);
 108         if (!lirc)
 109                 return -EFAULT;
 110
 111         ir_dev = lirc->ir_dev;
 112         if (!ir_dev || !ir_dev->props || !ir_dev->props->priv)
 113                 return -EFAULT;
 114
 115         drv_data = ir_dev->props->priv;
 116
 117         if (_IOC_DIR(cmd) & _IOC_WRITE) {
 118                 ret = get_user(val, (unsigned long *)arg);
 119                 if (ret)
 120                         return ret;
 121         }
 122
 123         switch (cmd) {
 124
 125         /* legacy support */
 126         case LIRC_GET_SEND_MODE:
 127                 val = LIRC_CAN_SEND_PULSE & LIRC_CAN_SEND_MASK;
 128                 break;
 129
 130         case LIRC_SET_SEND_MODE:
 131                 if (val != (LIRC_MODE_PULSE & LIRC_CAN_SEND_MASK))
 132                         return -EINVAL;
 133                 break;
 134
 135         /* TX settings */
 136         case LIRC_SET_TRANSMITTER_MASK:
 137                 if (ir_dev->props->s_tx_mask)
 138                         ret = ir_dev->props->s_tx_mask(drv_data, (u32)val);
 139                 else
 140                         return -EINVAL;
 141                 break;
 142
 143         case LIRC_SET_SEND_CARRIER:
 144                 if (ir_dev->props->s_tx_carrier)
 145                         ir_dev->props->s_tx_carrier(drv_data, (u32)val);
 146                 else
 147                         return -EINVAL;
 148                 break;
 149
 150         case LIRC_SET_SEND_DUTY_CYCLE:
 151                 if (!ir_dev->props->s_tx_duty_cycle)
 152                         return -ENOSYS;
 153
 154                 if (val <= 0 || val >= 100)
 155                         return -EINVAL;
 156
 157                 ir_dev->props->s_tx_duty_cycle(ir_dev->props->priv, val);
 158                 break;
 159
 160         /* RX settings */
 161         case LIRC_SET_REC_CARRIER:
 162                 if (ir_dev->props->s_rx_carrier_range)
 163                         ret = ir_dev->props->s_rx_carrier_range(
 164                                 ir_dev->props->priv,
 165                                 ir_dev->raw->lirc.carrier_low, val);
 166                 else
 167                         return -ENOSYS;
 168
 169                 if (!ret)
 170                         ir_dev->raw->lirc.carrier_low = 0;
 171                 break;
 172
 173         case LIRC_SET_REC_CARRIER_RANGE:
 174                 if (val >= 0)
 175                         ir_dev->raw->lirc.carrier_low = val;
 176                 break;
 177
 178
 179         case LIRC_GET_REC_RESOLUTION:
 180                 val = ir_dev->props->rx_resolution;
 181                 break;
 182
 183         case LIRC_SET_WIDEBAND_RECEIVER:
 184                 if (ir_dev->props->s_learning_mode)
 185                         return ir_dev->props->s_learning_mode(
 186                                 ir_dev->props->priv, !!val);
 187                 else
 188                         return -ENOSYS;
 189
 190         /* Generic timeout support */
 191         case LIRC_GET_MIN_TIMEOUT:
 192                 if (!ir_dev->props->max_timeout)
 193                         return -ENOSYS;
 194                 val = ir_dev->props->min_timeout / 1000;
 195                 break;
 196
 197         case LIRC_GET_MAX_TIMEOUT:
 198                 if (!ir_dev->props->max_timeout)
 199                         return -ENOSYS;
 200                 val = ir_dev->props->max_timeout / 1000;
 201                 break;
 202
 203         case LIRC_SET_REC_TIMEOUT:
 204                 if (val < ir_dev->props->min_timeout ||
 205                     val > ir_dev->props->max_timeout)
 206                         return -EINVAL;
 207                 ir_dev->props->timeout = val * 1000;
 208                 break;
 209
 210         default:
 211                 return lirc_dev_fop_ioctl(filep, cmd, arg);
 212         }
 213
 214         if (_IOC_DIR(cmd) & _IOC_READ)
 215                 ret = put_user(val, (unsigned long *)arg);
 216
 217         return ret;
 218 }
 219
 220 static int ir_lirc_open(void *data)
 221 {
 222         return 0;
 223 }
 224
 225 static void ir_lirc_close(void *data)
 226 {
 227         return;
 228 }
 229
 230 static struct file_operations lirc_fops = {
 231         .owner          = THIS_MODULE,
 232         .write          = ir_lirc_transmit_ir,
 233         .unlocked_ioctl = ir_lirc_ioctl,
 234         .read           = lirc_dev_fop_read,
 235         .poll           = lirc_dev_fop_poll,
 236         .open           = lirc_dev_fop_open,
 237         .release        = lirc_dev_fop_close,
 238         .llseek         = no_llseek,
 239 };
 240
 241 static int ir_lirc_register(struct input_dev *input_dev)
 242 {
 243         struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
 244         struct lirc_driver *drv;
 245         struct lirc_buffer *rbuf;
 246         int rc = -ENOMEM;
 247         unsigned long features;
 248
 249         drv = kzalloc(sizeof(struct lirc_driver), GFP_KERNEL);
 250         if (!drv)
 251                 return rc;
 252
 253         rbuf = kzalloc(sizeof(struct lirc_buffer), GFP_KERNEL);
 254         if (!rbuf)
 255                 goto rbuf_alloc_failed;
 256
 257         rc = lirc_buffer_init(rbuf, sizeof(int), LIRCBUF_SIZE);
 258         if (rc)
 259                 goto rbuf_init_failed;
 260
 261         features = LIRC_CAN_REC_MODE2;
 262         if (ir_dev->props->tx_ir) {
 263
 264                 features |= LIRC_CAN_SEND_PULSE;
 265                 if (ir_dev->props->s_tx_mask)
 266                         features |= LIRC_CAN_SET_TRANSMITTER_MASK;
 267                 if (ir_dev->props->s_tx_carrier)
 268                         features |= LIRC_CAN_SET_SEND_CARRIER;
 269
 270                 if (ir_dev->props->s_tx_duty_cycle)
 271                         features |= LIRC_CAN_SET_SEND_DUTY_CYCLE;
 272         }
 273
 274         if (ir_dev->props->s_rx_carrier_range)
 275                 features |= LIRC_CAN_SET_REC_CARRIER |
 276                         LIRC_CAN_SET_REC_CARRIER_RANGE;
 277
 278         if (ir_dev->props->s_learning_mode)
 279                 features |= LIRC_CAN_USE_WIDEBAND_RECEIVER;
 280
 281         if (ir_dev->props->max_timeout)
 282                 features |= LIRC_CAN_SET_REC_TIMEOUT;
 283
 284
 285         snprintf(drv->name, sizeof(drv->name), "ir-lirc-codec (%s)",
 286                  ir_dev->driver_name);
 287         drv->minor = -1;
 288         drv->features = features;
 289         drv->data = &ir_dev->raw->lirc;
 290         drv->rbuf = rbuf;
 291         drv->set_use_inc = &ir_lirc_open;
 292         drv->set_use_dec = &ir_lirc_close;
 293         drv->code_length = sizeof(struct ir_raw_event) * 8;
 294         drv->fops = &lirc_fops;
 295         drv->dev = &ir_dev->dev;
 296         drv->owner = THIS_MODULE;
 297
 298         drv->minor = lirc_register_driver(drv);
 299         if (drv->minor < 0) {
 300                 rc = -ENODEV;
 301                 goto lirc_register_failed;
 302         }
 303
 304         ir_dev->raw->lirc.drv = drv;
 305         ir_dev->raw->lirc.ir_dev = ir_dev;
 306         return 0;
 307
 308 lirc_register_failed:
 309 rbuf_init_failed:
 310         kfree(rbuf);
 311 rbuf_alloc_failed:
 312         kfree(drv);
 313
 314         return rc;
 315 }
 316
 317 static int ir_lirc_unregister(struct input_dev *input_dev)
 318 {
 319         struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
 320         struct lirc_codec *lirc = &ir_dev->raw->lirc;
 321
 322         lirc_unregister_driver(lirc->drv->minor);
 323         lirc_buffer_free(lirc->drv->rbuf);
 324         kfree(lirc->drv);
 325
 326         return 0;
 327 }
 328
 329 static struct ir_raw_handler lirc_handler = {
 330         .protocols      = IR_TYPE_LIRC,
 331         .decode         = ir_lirc_decode,
 332         .raw_register   = ir_lirc_register,
 333         .raw_unregister = ir_lirc_unregister,
 334 };
 335
 336 static int __init ir_lirc_codec_init(void)
 337 {
 338         ir_raw_handler_register(&lirc_handler);
 339
 340         printk(KERN_INFO "IR LIRC bridge handler initialized\n");
 341         return 0;
 342 }
 343
 344 static void __exit ir_lirc_codec_exit(void)
 345 {
 346         ir_raw_handler_unregister(&lirc_handler);
 347 }
 348
 349 module_init(ir_lirc_codec_init);
 350 module_exit(ir_lirc_codec_exit);
 351
 352 MODULE_LICENSE("GPL");
 353 MODULE_AUTHOR("Jarod Wilson <jarod@redhat.com>");
 354 MODULE_AUTHOR("Red Hat Inc. (http://www.redhat.com)");
 355 MODULE_DESCRIPTION("LIRC IR handler bridge");