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
  36         if (!(ir_dev->raw->enabled_protocols & IR_TYPE_LIRC))
  37                 return 0;
  38
  39         if (!ir_dev->raw->lirc.drv || !ir_dev->raw->lirc.drv->rbuf)
  40                 return -EINVAL;
  41
  42         IR_dprintk(2, "LIRC data transfer started (%uus %s)\n",
  43                    TO_US(ev.duration), TO_STR(ev.pulse));
  44
  45         ir_dev->raw->lirc.lircdata += ev.duration / 1000;
  46         if (ev.pulse)
  47                 ir_dev->raw->lirc.lircdata |= PULSE_BIT;
  48
  49         lirc_buffer_write(ir_dev->raw->lirc.drv->rbuf,
  50                           (unsigned char *) &ir_dev->raw->lirc.lircdata);
  51         wake_up(&ir_dev->raw->lirc.drv->rbuf->wait_poll);
  52
  53         ir_dev->raw->lirc.lircdata = 0;
  54
  55         return 0;
  56 }
  57
  58 static ssize_t ir_lirc_transmit_ir(struct file *file, const char *buf,
  59                                    size_t n, loff_t *ppos)
  60 {
  61         struct lirc_codec *lirc;
  62         struct ir_input_dev *ir_dev;
  63         int *txbuf; /* buffer with values to transmit */
  64         int ret = 0, count;
  65
  66         lirc = lirc_get_pdata(file);
  67         if (!lirc)
  68                 return -EFAULT;
  69
  70         if (n % sizeof(int))
  71                 return -EINVAL;
  72
  73         count = n / sizeof(int);
  74         if (count > LIRCBUF_SIZE || count % 2 == 0)
  75                 return -EINVAL;
  76
  77         txbuf = kzalloc(sizeof(int) * LIRCBUF_SIZE, GFP_KERNEL);
  78         if (!txbuf)
  79                 return -ENOMEM;
  80
  81         if (copy_from_user(txbuf, buf, n)) {
  82                 ret = -EFAULT;
  83                 goto out;
  84         }
  85
  86         ir_dev = lirc->ir_dev;
  87         if (!ir_dev) {
  88                 ret = -EFAULT;
  89                 goto out;
  90         }
  91
  92         if (ir_dev->props && ir_dev->props->tx_ir)
  93                 ret = ir_dev->props->tx_ir(ir_dev->props->priv, txbuf, (u32)n);
  94
  95 out:
  96         kfree(txbuf);
  97         return ret;
  98 }
  99
 100 static long ir_lirc_ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
 101 {
 102         struct lirc_codec *lirc;
 103         struct ir_input_dev *ir_dev;
 104         int ret = 0;
 105         void *drv_data;
 106         unsigned long val;
 107
 108         lirc = lirc_get_pdata(filep);
 109         if (!lirc)
 110                 return -EFAULT;
 111
 112         ir_dev = lirc->ir_dev;
 113         if (!ir_dev || !ir_dev->props || !ir_dev->props->priv)
 114                 return -EFAULT;
 115
 116         drv_data = ir_dev->props->priv;
 117
 118         switch (cmd) {
 119         case LIRC_SET_TRANSMITTER_MASK:
 120                 ret = get_user(val, (unsigned long *)arg);
 121                 if (ret)
 122                         return ret;
 123
 124                 if (ir_dev->props && ir_dev->props->s_tx_mask)
 125                         ret = ir_dev->props->s_tx_mask(drv_data, (u32)val);
 126                 else
 127                         return -EINVAL;
 128                 break;
 129
 130         case LIRC_SET_SEND_CARRIER:
 131                 ret = get_user(val, (unsigned long *)arg);
 132                 if (ret)
 133                         return ret;
 134
 135                 if (ir_dev->props && ir_dev->props->s_tx_carrier)
 136                         ir_dev->props->s_tx_carrier(drv_data, (u32)val);
 137                 else
 138                         return -EINVAL;
 139                 break;
 140
 141         case LIRC_GET_SEND_MODE:
 142                 val = LIRC_CAN_SEND_PULSE & LIRC_CAN_SEND_MASK;
 143                 ret = put_user(val, (unsigned long *)arg);
 144                 break;
 145
 146         case LIRC_SET_SEND_MODE:
 147                 ret = get_user(val, (unsigned long *)arg);
 148                 if (ret)
 149                         return ret;
 150
 151                 if (val != (LIRC_MODE_PULSE & LIRC_CAN_SEND_MASK))
 152                         return -EINVAL;
 153                 break;
 154
 155         default:
 156                 return lirc_dev_fop_ioctl(filep, cmd, arg);
 157         }
 158
 159         return ret;
 160 }
 161
 162 static int ir_lirc_open(void *data)
 163 {
 164         return 0;
 165 }
 166
 167 static void ir_lirc_close(void *data)
 168 {
 169         return;
 170 }
 171
 172 static struct file_operations lirc_fops = {
 173         .owner          = THIS_MODULE,
 174         .write          = ir_lirc_transmit_ir,
 175         .unlocked_ioctl = ir_lirc_ioctl,
 176         .read           = lirc_dev_fop_read,
 177         .poll           = lirc_dev_fop_poll,
 178         .open           = lirc_dev_fop_open,
 179         .release        = lirc_dev_fop_close,
 180 };
 181
 182 static int ir_lirc_register(struct input_dev *input_dev)
 183 {
 184         struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
 185         struct lirc_driver *drv;
 186         struct lirc_buffer *rbuf;
 187         int rc = -ENOMEM;
 188         unsigned long features;
 189
 190         drv = kzalloc(sizeof(struct lirc_driver), GFP_KERNEL);
 191         if (!drv)
 192                 return rc;
 193
 194         rbuf = kzalloc(sizeof(struct lirc_buffer), GFP_KERNEL);
 195         if (!drv)
 196                 goto rbuf_alloc_failed;
 197
 198         rc = lirc_buffer_init(rbuf, sizeof(int), LIRCBUF_SIZE);
 199         if (rc)
 200                 goto rbuf_init_failed;
 201
 202         features = LIRC_CAN_REC_MODE2;
 203         if (ir_dev->props->tx_ir) {
 204                 features |= LIRC_CAN_SEND_PULSE;
 205                 if (ir_dev->props->s_tx_mask)
 206                         features |= LIRC_CAN_SET_TRANSMITTER_MASK;
 207                 if (ir_dev->props->s_tx_carrier)
 208                         features |= LIRC_CAN_SET_SEND_CARRIER;
 209         }
 210
 211         snprintf(drv->name, sizeof(drv->name), "ir-lirc-codec (%s)",
 212                  ir_dev->driver_name);
 213         drv->minor = -1;
 214         drv->features = features;
 215         drv->data = &ir_dev->raw->lirc;
 216         drv->rbuf = rbuf;
 217         drv->set_use_inc = &ir_lirc_open;
 218         drv->set_use_dec = &ir_lirc_close;
 219         drv->code_length = sizeof(struct ir_raw_event) * 8;
 220         drv->fops = &lirc_fops;
 221         drv->dev = &ir_dev->dev;
 222         drv->owner = THIS_MODULE;
 223
 224         drv->minor = lirc_register_driver(drv);
 225         if (drv->minor < 0) {
 226                 rc = -ENODEV;
 227                 goto lirc_register_failed;
 228         }
 229
 230         ir_dev->raw->lirc.drv = drv;
 231         ir_dev->raw->lirc.ir_dev = ir_dev;
 232         ir_dev->raw->lirc.lircdata = PULSE_MASK;
 233
 234         return 0;
 235
 236 lirc_register_failed:
 237 rbuf_init_failed:
 238         kfree(rbuf);
 239 rbuf_alloc_failed:
 240         kfree(drv);
 241
 242         return rc;
 243 }
 244
 245 static int ir_lirc_unregister(struct input_dev *input_dev)
 246 {
 247         struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
 248         struct lirc_codec *lirc = &ir_dev->raw->lirc;
 249
 250         lirc_unregister_driver(lirc->drv->minor);
 251         lirc_buffer_free(lirc->drv->rbuf);
 252         kfree(lirc->drv);
 253
 254         return 0;
 255 }
 256
 257 static struct ir_raw_handler lirc_handler = {
 258         .protocols      = IR_TYPE_LIRC,
 259         .decode         = ir_lirc_decode,
 260         .raw_register   = ir_lirc_register,
 261         .raw_unregister = ir_lirc_unregister,
 262 };
 263
 264 static int __init ir_lirc_codec_init(void)
 265 {
 266         ir_raw_handler_register(&lirc_handler);
 267
 268         printk(KERN_INFO "IR LIRC bridge handler initialized\n");
 269         return 0;
 270 }
 271
 272 static void __exit ir_lirc_codec_exit(void)
 273 {
 274         ir_raw_handler_unregister(&lirc_handler);
 275 }
 276
 277 module_init(ir_lirc_codec_init);
 278 module_exit(ir_lirc_codec_exit);
 279
 280 MODULE_LICENSE("GPL");
 281 MODULE_AUTHOR("Jarod Wilson <jarod@redhat.com>");
 282 MODULE_AUTHOR("Red Hat Inc. (http://www.redhat.com)");
 283 MODULE_DESCRIPTION("LIRC IR handler bridge");