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