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