drivers/media/video/saa7134/saa7134-empress.c

   1 /*
   2  *
   3  * (c) 2004 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
   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; either version 2 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  */
  19
  20 #include <linux/init.h>
  21 #include <linux/list.h>
  22 #include <linux/module.h>
  23 #include <linux/moduleparam.h>
  24 #include <linux/kernel.h>
  25 #include <linux/slab.h>
  26 #include <linux/delay.h>
  27
  28 #include "saa7134-reg.h"
  29 #include "saa7134.h"
  30
  31 #include <media/saa6752hs.h>
  32 #include <media/v4l2-common.h>
  33
  34 /* ------------------------------------------------------------------ */
  35
  36 MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]");
  37 MODULE_LICENSE("GPL");
  38
  39 static unsigned int empress_nr[] = {[0 ... (SAA7134_MAXBOARDS - 1)] = UNSET };
  40
  41 module_param_array(empress_nr, int, NULL, 0444);
  42 MODULE_PARM_DESC(empress_nr,"ts device number");
  43
  44 static unsigned int debug = 0;
  45 module_param(debug, int, 0644);
  46 MODULE_PARM_DESC(debug,"enable debug messages");
  47
  48 #define dprintk(fmt, arg...)    if (debug)                      \
  49         printk(KERN_DEBUG "%s/empress: " fmt, dev->name , ## arg)
  50
  51 /* ------------------------------------------------------------------ */
  52
  53 static void ts_reset_encoder(struct saa7134_dev* dev)
  54 {
  55         if (!dev->empress_started)
  56                 return;
  57
  58         saa_writeb(SAA7134_SPECIAL_MODE, 0x00);
  59         msleep(10);
  60         saa_writeb(SAA7134_SPECIAL_MODE, 0x01);
  61         msleep(100);
  62         dev->empress_started = 0;
  63 }
  64
  65 static int ts_init_encoder(struct saa7134_dev* dev)
  66 {
  67         struct v4l2_ext_controls ctrls = { V4L2_CTRL_CLASS_MPEG, 0 };
  68
  69         ts_reset_encoder(dev);
  70         saa7134_i2c_call_clients(dev, VIDIOC_S_EXT_CTRLS, &ctrls);
  71         dev->empress_started = 1;
  72         return 0;
  73 }
  74
  75 /* ------------------------------------------------------------------ */
  76
  77 static int ts_open(struct inode *inode, struct file *file)
  78 {
  79         int minor = iminor(inode);
  80         struct saa7134_dev *h,*dev = NULL;
  81         struct list_head *list;
  82         int err;
  83
  84         list_for_each(list,&saa7134_devlist) {
  85                 h = list_entry(list, struct saa7134_dev, devlist);
  86                 if (h->empress_dev && h->empress_dev->minor == minor)
  87                         dev = h;
  88         }
  89         if (NULL == dev)
  90                 return -ENODEV;
  91
  92         dprintk("open minor=%d\n",minor);
  93         err = -EBUSY;
  94         if (!mutex_trylock(&dev->empress_tsq.lock))
  95                 goto done;
  96         if (dev->empress_users)
  97                 goto done_up;
  98
  99         dev->empress_users++;
 100         file->private_data = dev;
 101         err = 0;
 102
 103 done_up:
 104         mutex_unlock(&dev->empress_tsq.lock);
 105 done:
 106         return err;
 107 }
 108
 109 static int ts_release(struct inode *inode, struct file *file)
 110 {
 111         struct saa7134_dev *dev = file->private_data;
 112
 113         if (dev->empress_tsq.streaming)
 114                 videobuf_streamoff(&dev->empress_tsq);
 115         mutex_lock(&dev->empress_tsq.lock);
 116         if (dev->empress_tsq.reading)
 117                 videobuf_read_stop(&dev->empress_tsq);
 118         videobuf_mmap_free(&dev->empress_tsq);
 119         dev->empress_users--;
 120
 121         /* stop the encoder */
 122         ts_reset_encoder(dev);
 123
 124         mutex_unlock(&dev->empress_tsq.lock);
 125         return 0;
 126 }
 127
 128 static ssize_t
 129 ts_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
 130 {
 131         struct saa7134_dev *dev = file->private_data;
 132
 133         if (!dev->empress_started)
 134                 ts_init_encoder(dev);
 135
 136         return videobuf_read_stream(&dev->empress_tsq,
 137                                     data, count, ppos, 0,
 138                                     file->f_flags & O_NONBLOCK);
 139 }
 140
 141 static unsigned int
 142 ts_poll(struct file *file, struct poll_table_struct *wait)
 143 {
 144         struct saa7134_dev *dev = file->private_data;
 145
 146         return videobuf_poll_stream(file, &dev->empress_tsq, wait);
 147 }
 148
 149
 150 static int
 151 ts_mmap(struct file *file, struct vm_area_struct * vma)
 152 {
 153         struct saa7134_dev *dev = file->private_data;
 154
 155         return videobuf_mmap_mapper(&dev->empress_tsq, vma);
 156 }
 157
 158 /*
 159  * This function is _not_ called directly, but from
 160  * video_generic_ioctl (and maybe others).  userspace
 161  * copying is done already, arg is a kernel pointer.
 162  */
 163 static int ts_do_ioctl(struct inode *inode, struct file *file,
 164                        unsigned int cmd, void *arg)
 165 {
 166         struct saa7134_dev *dev = file->private_data;
 167         struct v4l2_ext_controls *ctrls = arg;
 168
 169         if (debug > 1)
 170                 v4l_print_ioctl(dev->name,cmd);
 171         switch (cmd) {
 172         case VIDIOC_QUERYCAP:
 173         {
 174                 struct v4l2_capability *cap = arg;
 175
 176                 memset(cap,0,sizeof(*cap));
 177                 strcpy(cap->driver, "saa7134");
 178                 strlcpy(cap->card, saa7134_boards[dev->board].name,
 179                         sizeof(cap->card));
 180                 sprintf(cap->bus_info,"PCI:%s",pci_name(dev->pci));
 181                 cap->version = SAA7134_VERSION_CODE;
 182                 cap->capabilities =
 183                         V4L2_CAP_VIDEO_CAPTURE |
 184                         V4L2_CAP_READWRITE |
 185                         V4L2_CAP_STREAMING;
 186                 return 0;
 187         }
 188
 189         /* --- input switching --------------------------------------- */
 190         case VIDIOC_ENUMINPUT:
 191         {
 192                 struct v4l2_input *i = arg;
 193
 194                 if (i->index != 0)
 195                         return -EINVAL;
 196                 i->type = V4L2_INPUT_TYPE_CAMERA;
 197                 strcpy(i->name,"CCIR656");
 198                 return 0;
 199         }
 200         case VIDIOC_G_INPUT:
 201         {
 202                 int *i = arg;
 203                 *i = 0;
 204                 return 0;
 205         }
 206         case VIDIOC_S_INPUT:
 207         {
 208                 int *i = arg;
 209
 210                 if (*i != 0)
 211                         return -EINVAL;
 212                 return 0;
 213         }
 214         /* --- capture ioctls ---------------------------------------- */
 215
 216         case VIDIOC_ENUM_FMT:
 217         {
 218                 struct v4l2_fmtdesc *f = arg;
 219                 int index;
 220
 221                 index = f->index;
 222                 if (index != 0)
 223                         return -EINVAL;
 224
 225                 memset(f,0,sizeof(*f));
 226                 f->index = index;
 227                 strlcpy(f->description, "MPEG TS", sizeof(f->description));
 228                 f->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 229                 f->pixelformat = V4L2_PIX_FMT_MPEG;
 230                 return 0;
 231         }
 232
 233         case VIDIOC_G_FMT:
 234         {
 235                 struct v4l2_format *f = arg;
 236
 237                 memset(f,0,sizeof(*f));
 238                 f->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 239
 240                 saa7134_i2c_call_clients(dev, cmd, arg);
 241                 f->fmt.pix.pixelformat  = V4L2_PIX_FMT_MPEG;
 242                 f->fmt.pix.sizeimage    = TS_PACKET_SIZE * dev->ts.nr_packets;
 243                 return 0;
 244         }
 245
 246         case VIDIOC_S_FMT:
 247         {
 248                 struct v4l2_format *f = arg;
 249
 250                 if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 251                     return -EINVAL;
 252
 253                 saa7134_i2c_call_clients(dev, cmd, arg);
 254                 f->fmt.pix.pixelformat  = V4L2_PIX_FMT_MPEG;
 255                 f->fmt.pix.sizeimage    = TS_PACKET_SIZE* dev->ts.nr_packets;
 256                 return 0;
 257         }
 258
 259         case VIDIOC_REQBUFS:
 260                 return videobuf_reqbufs(&dev->empress_tsq,arg);
 261
 262         case VIDIOC_QUERYBUF:
 263                 return videobuf_querybuf(&dev->empress_tsq,arg);
 264
 265         case VIDIOC_QBUF:
 266                 return videobuf_qbuf(&dev->empress_tsq,arg);
 267
 268         case VIDIOC_DQBUF:
 269                 return videobuf_dqbuf(&dev->empress_tsq,arg,
 270                                       file->f_flags & O_NONBLOCK);
 271
 272         case VIDIOC_STREAMON:
 273                 return videobuf_streamon(&dev->empress_tsq);
 274
 275         case VIDIOC_STREAMOFF:
 276                 return videobuf_streamoff(&dev->empress_tsq);
 277
 278         case VIDIOC_QUERYCTRL:
 279         case VIDIOC_G_CTRL:
 280         case VIDIOC_S_CTRL:
 281                 return saa7134_common_ioctl(dev, cmd, arg);
 282
 283         case VIDIOC_S_MPEGCOMP:
 284                 printk(KERN_WARNING "VIDIOC_S_MPEGCOMP is obsolete. "
 285                                     "Replace with VIDIOC_S_EXT_CTRLS!");
 286                 saa7134_i2c_call_clients(dev, VIDIOC_S_MPEGCOMP, arg);
 287                 ts_init_encoder(dev);
 288                 return 0;
 289         case VIDIOC_G_MPEGCOMP:
 290                 printk(KERN_WARNING "VIDIOC_G_MPEGCOMP is obsolete. "
 291                                     "Replace with VIDIOC_G_EXT_CTRLS!");
 292                 saa7134_i2c_call_clients(dev, VIDIOC_G_MPEGCOMP, arg);
 293                 return 0;
 294         case VIDIOC_S_EXT_CTRLS:
 295                 /* count == 0 is abused in saa6752hs.c, so that special
 296                    case is handled here explicitly. */
 297                 if (ctrls->count == 0)
 298                         return 0;
 299                 if (ctrls->ctrl_class != V4L2_CTRL_CLASS_MPEG)
 300                         return -EINVAL;
 301                 saa7134_i2c_call_clients(dev, VIDIOC_S_EXT_CTRLS, arg);
 302                 ts_init_encoder(dev);
 303                 return 0;
 304         case VIDIOC_G_EXT_CTRLS:
 305                 if (ctrls->ctrl_class != V4L2_CTRL_CLASS_MPEG)
 306                         return -EINVAL;
 307                 saa7134_i2c_call_clients(dev, VIDIOC_G_EXT_CTRLS, arg);
 308                 return 0;
 309
 310         default:
 311                 return -ENOIOCTLCMD;
 312         }
 313         return 0;
 314 }
 315
 316 static int ts_ioctl(struct inode *inode, struct file *file,
 317                      unsigned int cmd, unsigned long arg)
 318 {
 319         return video_usercopy(inode, file, cmd, arg, ts_do_ioctl);
 320 }
 321
 322 static const struct file_operations ts_fops =
 323 {
 324         .owner    = THIS_MODULE,
 325         .open     = ts_open,
 326         .release  = ts_release,
 327         .read     = ts_read,
 328         .poll     = ts_poll,
 329         .mmap     = ts_mmap,
 330         .ioctl    = ts_ioctl,
 331         .llseek   = no_llseek,
 332 };
 333
 334 /* ----------------------------------------------------------- */
 335
 336 static struct video_device saa7134_empress_template =
 337 {
 338         .name          = "saa7134-empress",
 339         .type          = 0 /* FIXME */,
 340         .type2         = 0 /* FIXME */,
 341         .hardware      = 0,
 342         .fops          = &ts_fops,
 343         .minor         = -1,
 344 };
 345
 346 static void empress_signal_update(struct work_struct *work)
 347 {
 348         struct saa7134_dev* dev =
 349                 container_of(work, struct saa7134_dev, empress_workqueue);
 350
 351         if (dev->nosignal) {
 352                 dprintk("no video signal\n");
 353                 ts_reset_encoder(dev);
 354         } else {
 355                 dprintk("video signal acquired\n");
 356                 if (dev->empress_users)
 357                         ts_init_encoder(dev);
 358         }
 359 }
 360
 361 static void empress_signal_change(struct saa7134_dev *dev)
 362 {
 363         schedule_work(&dev->empress_workqueue);
 364 }
 365
 366
 367 static int empress_init(struct saa7134_dev *dev)
 368 {
 369         int err;
 370
 371         dprintk("%s: %s\n",dev->name,__FUNCTION__);
 372         dev->empress_dev = video_device_alloc();
 373         if (NULL == dev->empress_dev)
 374                 return -ENOMEM;
 375         *(dev->empress_dev) = saa7134_empress_template;
 376         dev->empress_dev->dev     = &dev->pci->dev;
 377         dev->empress_dev->release = video_device_release;
 378         snprintf(dev->empress_dev->name, sizeof(dev->empress_dev->name),
 379                  "%s empress (%s)", dev->name,
 380                  saa7134_boards[dev->board].name);
 381
 382         INIT_WORK(&dev->empress_workqueue, empress_signal_update);
 383
 384         err = video_register_device(dev->empress_dev,VFL_TYPE_GRABBER,
 385                                     empress_nr[dev->nr]);
 386         if (err < 0) {
 387                 printk(KERN_INFO "%s: can't register video device\n",
 388                        dev->name);
 389                 video_device_release(dev->empress_dev);
 390                 dev->empress_dev = NULL;
 391                 return err;
 392         }
 393         printk(KERN_INFO "%s: registered device video%d [mpeg]\n",
 394                dev->name,dev->empress_dev->minor & 0x1f);
 395
 396         videobuf_queue_init(&dev->empress_tsq, &saa7134_ts_qops,
 397                             dev->pci, &dev->slock,
 398                             V4L2_BUF_TYPE_VIDEO_CAPTURE,
 399                             V4L2_FIELD_ALTERNATE,
 400                             sizeof(struct saa7134_buf),
 401                             dev);
 402
 403         empress_signal_update(&dev->empress_workqueue);
 404         return 0;
 405 }
 406
 407 static int empress_fini(struct saa7134_dev *dev)
 408 {
 409         dprintk("%s: %s\n",dev->name,__FUNCTION__);
 410
 411         if (NULL == dev->empress_dev)
 412                 return 0;
 413         flush_scheduled_work();
 414         video_unregister_device(dev->empress_dev);
 415         dev->empress_dev = NULL;
 416         return 0;
 417 }
 418
 419 static struct saa7134_mpeg_ops empress_ops = {
 420         .type          = SAA7134_MPEG_EMPRESS,
 421         .init          = empress_init,
 422         .fini          = empress_fini,
 423         .signal_change = empress_signal_change,
 424 };
 425
 426 static int __init empress_register(void)
 427 {
 428         return saa7134_ts_register(&empress_ops);
 429 }
 430
 431 static void __exit empress_unregister(void)
 432 {
 433         saa7134_ts_unregister(&empress_ops);
 434 }
 435
 436 module_init(empress_register);
 437 module_exit(empress_unregister);
 438
 439 /* ----------------------------------------------------------- */
 440 /*
 441  * Local variables:
 442  * c-basic-offset: 8
 443  * End:
 444  */