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         ts_reset_encoder(dev);
  68         saa7134_i2c_call_clients(dev, VIDIOC_S_MPEGCOMP, NULL);
  69         dev->empress_started = 1;
  70         return 0;
  71 }
  72
  73 /* ------------------------------------------------------------------ */
  74
  75 static int ts_open(struct inode *inode, struct file *file)
  76 {
  77         int minor = iminor(inode);
  78         struct saa7134_dev *h,*dev = NULL;
  79         struct list_head *list;
  80         int err;
  81
  82         list_for_each(list,&saa7134_devlist) {
  83                 h = list_entry(list, struct saa7134_dev, devlist);
  84                 if (h->empress_dev && h->empress_dev->minor == minor)
  85                         dev = h;
  86         }
  87         if (NULL == dev)
  88                 return -ENODEV;
  89
  90         dprintk("open minor=%d\n",minor);
  91         err = -EBUSY;
  92         if (down_trylock(&dev->empress_tsq.lock))
  93                 goto done;
  94         if (dev->empress_users)
  95                 goto done_up;
  96
  97         dev->empress_users++;
  98         file->private_data = dev;
  99         err = 0;
 100
 101 done_up:
 102         up(&dev->empress_tsq.lock);
 103 done:
 104         return err;
 105 }
 106
 107 static int ts_release(struct inode *inode, struct file *file)
 108 {
 109         struct saa7134_dev *dev = file->private_data;
 110
 111         if (dev->empress_tsq.streaming)
 112                 videobuf_streamoff(&dev->empress_tsq);
 113         down(&dev->empress_tsq.lock);
 114         if (dev->empress_tsq.reading)
 115                 videobuf_read_stop(&dev->empress_tsq);
 116         videobuf_mmap_free(&dev->empress_tsq);
 117         dev->empress_users--;
 118
 119         /* stop the encoder */
 120         ts_reset_encoder(dev);
 121
 122         up(&dev->empress_tsq.lock);
 123         return 0;
 124 }
 125
 126 static ssize_t
 127 ts_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
 128 {
 129         struct saa7134_dev *dev = file->private_data;
 130
 131         if (!dev->empress_started)
 132                 ts_init_encoder(dev);
 133
 134         return videobuf_read_stream(&dev->empress_tsq,
 135                                     data, count, ppos, 0,
 136                                     file->f_flags & O_NONBLOCK);
 137 }
 138
 139 static unsigned int
 140 ts_poll(struct file *file, struct poll_table_struct *wait)
 141 {
 142         struct saa7134_dev *dev = file->private_data;
 143
 144         return videobuf_poll_stream(file, &dev->empress_tsq, wait);
 145 }
 146
 147
 148 static int
 149 ts_mmap(struct file *file, struct vm_area_struct * vma)
 150 {
 151         struct saa7134_dev *dev = file->private_data;
 152
 153         return videobuf_mmap_mapper(&dev->empress_tsq, vma);
 154 }
 155
 156 /*
 157  * This function is _not_ called directly, but from
 158  * video_generic_ioctl (and maybe others).  userspace
 159  * copying is done already, arg is a kernel pointer.
 160  */
 161 static int ts_do_ioctl(struct inode *inode, struct file *file,
 162                        unsigned int cmd, void *arg)
 163 {
 164         struct saa7134_dev *dev = file->private_data;
 165
 166         if (debug > 1)
 167                 v4l_print_ioctl(dev->name,cmd);
 168         switch (cmd) {
 169         case VIDIOC_QUERYCAP:
 170         {
 171                 struct v4l2_capability *cap = arg;
 172
 173                 memset(cap,0,sizeof(*cap));
 174                 strcpy(cap->driver, "saa7134");
 175                 strlcpy(cap->card, saa7134_boards[dev->board].name,
 176                         sizeof(cap->card));
 177                 sprintf(cap->bus_info,"PCI:%s",pci_name(dev->pci));
 178                 cap->version = SAA7134_VERSION_CODE;
 179                 cap->capabilities =
 180                         V4L2_CAP_VIDEO_CAPTURE |
 181                         V4L2_CAP_READWRITE |
 182                         V4L2_CAP_STREAMING;
 183                 return 0;
 184         }
 185
 186         /* --- input switching --------------------------------------- */
 187         case VIDIOC_ENUMINPUT:
 188         {
 189                 struct v4l2_input *i = arg;
 190
 191                 if (i->index != 0)
 192                         return -EINVAL;
 193                 i->type = V4L2_INPUT_TYPE_CAMERA;
 194                 strcpy(i->name,"CCIR656");
 195                 return 0;
 196         }
 197         case VIDIOC_G_INPUT:
 198         {
 199                 int *i = arg;
 200                 *i = 0;
 201                 return 0;
 202         }
 203         case VIDIOC_S_INPUT:
 204         {
 205                 int *i = arg;
 206
 207                 if (*i != 0)
 208                         return -EINVAL;
 209                 return 0;
 210         }
 211         /* --- capture ioctls ---------------------------------------- */
 212
 213         case VIDIOC_ENUM_FMT:
 214         {
 215                 struct v4l2_fmtdesc *f = arg;
 216                 int index;
 217
 218                 index = f->index;
 219                 if (index != 0)
 220                         return -EINVAL;
 221
 222                 memset(f,0,sizeof(*f));
 223                 f->index = index;
 224                 strlcpy(f->description, "MPEG TS", sizeof(f->description));
 225                 f->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 226                 f->pixelformat = V4L2_PIX_FMT_MPEG;
 227                 return 0;
 228         }
 229
 230         case VIDIOC_G_FMT:
 231         {
 232                 struct v4l2_format *f = arg;
 233
 234                 memset(f,0,sizeof(*f));
 235                 f->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 236
 237                 saa7134_i2c_call_clients(dev, cmd, arg);
 238                 f->fmt.pix.pixelformat  = V4L2_PIX_FMT_MPEG;
 239                 f->fmt.pix.sizeimage    = TS_PACKET_SIZE * dev->ts.nr_packets;
 240                 return 0;
 241         }
 242
 243         case VIDIOC_S_FMT:
 244         {
 245                 struct v4l2_format *f = arg;
 246
 247                 if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 248                     return -EINVAL;
 249
 250                 saa7134_i2c_call_clients(dev, cmd, arg);
 251                 f->fmt.pix.pixelformat  = V4L2_PIX_FMT_MPEG;
 252                 f->fmt.pix.sizeimage    = TS_PACKET_SIZE* dev->ts.nr_packets;
 253                 return 0;
 254         }
 255
 256         case VIDIOC_REQBUFS:
 257                 return videobuf_reqbufs(&dev->empress_tsq,arg);
 258
 259         case VIDIOC_QUERYBUF:
 260                 return videobuf_querybuf(&dev->empress_tsq,arg);
 261
 262         case VIDIOC_QBUF:
 263                 return videobuf_qbuf(&dev->empress_tsq,arg);
 264
 265         case VIDIOC_DQBUF:
 266                 return videobuf_dqbuf(&dev->empress_tsq,arg,
 267                                       file->f_flags & O_NONBLOCK);
 268
 269         case VIDIOC_STREAMON:
 270                 return videobuf_streamon(&dev->empress_tsq);
 271
 272         case VIDIOC_STREAMOFF:
 273                 return videobuf_streamoff(&dev->empress_tsq);
 274
 275         case VIDIOC_QUERYCTRL:
 276         case VIDIOC_G_CTRL:
 277         case VIDIOC_S_CTRL:
 278                 return saa7134_common_ioctl(dev, cmd, arg);
 279
 280         case VIDIOC_S_MPEGCOMP:
 281                 saa7134_i2c_call_clients(dev, VIDIOC_S_MPEGCOMP, arg);
 282                 ts_init_encoder(dev);
 283                 return 0;
 284         case VIDIOC_G_MPEGCOMP:
 285                 saa7134_i2c_call_clients(dev, VIDIOC_G_MPEGCOMP, arg);
 286                 return 0;
 287
 288         default:
 289                 return -ENOIOCTLCMD;
 290         }
 291         return 0;
 292 }
 293
 294 static int ts_ioctl(struct inode *inode, struct file *file,
 295                      unsigned int cmd, unsigned long arg)
 296 {
 297         return video_usercopy(inode, file, cmd, arg, ts_do_ioctl);
 298 }
 299
 300 static struct file_operations ts_fops =
 301 {
 302         .owner    = THIS_MODULE,
 303         .open     = ts_open,
 304         .release  = ts_release,
 305         .read     = ts_read,
 306         .poll     = ts_poll,
 307         .mmap     = ts_mmap,
 308         .ioctl    = ts_ioctl,
 309         .llseek   = no_llseek,
 310 };
 311
 312 /* ----------------------------------------------------------- */
 313
 314 static struct video_device saa7134_empress_template =
 315 {
 316         .name          = "saa7134-empress",
 317         .type          = 0 /* FIXME */,
 318         .type2         = 0 /* FIXME */,
 319         .hardware      = 0,
 320         .fops          = &ts_fops,
 321         .minor         = -1,
 322 };
 323
 324 static void empress_signal_update(void* data)
 325 {
 326         struct saa7134_dev* dev = (struct saa7134_dev*) data;
 327
 328         if (dev->nosignal) {
 329                 dprintk("no video signal\n");
 330                 ts_reset_encoder(dev);
 331         } else {
 332                 dprintk("video signal acquired\n");
 333                 if (dev->empress_users)
 334                         ts_init_encoder(dev);
 335         }
 336 }
 337
 338 static void empress_signal_change(struct saa7134_dev *dev)
 339 {
 340         schedule_work(&dev->empress_workqueue);
 341 }
 342
 343
 344 static int empress_init(struct saa7134_dev *dev)
 345 {
 346         int err;
 347
 348         dprintk("%s: %s\n",dev->name,__FUNCTION__);
 349         dev->empress_dev = video_device_alloc();
 350         if (NULL == dev->empress_dev)
 351                 return -ENOMEM;
 352         *(dev->empress_dev) = saa7134_empress_template;
 353         dev->empress_dev->dev     = &dev->pci->dev;
 354         dev->empress_dev->release = video_device_release;
 355         snprintf(dev->empress_dev->name, sizeof(dev->empress_dev->name),
 356                  "%s empress (%s)", dev->name,
 357                  saa7134_boards[dev->board].name);
 358
 359         INIT_WORK(&dev->empress_workqueue, empress_signal_update, (void*) dev);
 360
 361         err = video_register_device(dev->empress_dev,VFL_TYPE_GRABBER,
 362                                     empress_nr[dev->nr]);
 363         if (err < 0) {
 364                 printk(KERN_INFO "%s: can't register video device\n",
 365                        dev->name);
 366                 video_device_release(dev->empress_dev);
 367                 dev->empress_dev = NULL;
 368                 return err;
 369         }
 370         printk(KERN_INFO "%s: registered device video%d [mpeg]\n",
 371                dev->name,dev->empress_dev->minor & 0x1f);
 372
 373         videobuf_queue_init(&dev->empress_tsq, &saa7134_ts_qops,
 374                             dev->pci, &dev->slock,
 375                             V4L2_BUF_TYPE_VIDEO_CAPTURE,
 376                             V4L2_FIELD_ALTERNATE,
 377                             sizeof(struct saa7134_buf),
 378                             dev);
 379
 380         empress_signal_update(dev);
 381         return 0;
 382 }
 383
 384 static int empress_fini(struct saa7134_dev *dev)
 385 {
 386         dprintk("%s: %s\n",dev->name,__FUNCTION__);
 387
 388         if (NULL == dev->empress_dev)
 389                 return 0;
 390         flush_scheduled_work();
 391         video_unregister_device(dev->empress_dev);
 392         dev->empress_dev = NULL;
 393         return 0;
 394 }
 395
 396 static struct saa7134_mpeg_ops empress_ops = {
 397         .type          = SAA7134_MPEG_EMPRESS,
 398         .init          = empress_init,
 399         .fini          = empress_fini,
 400         .signal_change = empress_signal_change,
 401 };
 402
 403 static int __init empress_register(void)
 404 {
 405         return saa7134_ts_register(&empress_ops);
 406 }
 407
 408 static void __exit empress_unregister(void)
 409 {
 410         saa7134_ts_unregister(&empress_ops);
 411 }
 412
 413 module_init(empress_register);
 414 module_exit(empress_unregister);
 415
 416 /* ----------------------------------------------------------- */
 417 /*
 418  * Local variables:
 419  * c-basic-offset: 8
 420  * End:
 421  */