drivers/media/common/saa7146/saa7146_fops.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   3
   4 #include <media/drv-intf/saa7146_vv.h>
   5 #include <linux/module.h>
   6
   7 /****************************************************************************/
   8 /* resource management functions, shamelessly stolen from saa7134 driver */
   9
  10 int saa7146_res_get(struct saa7146_dev *dev, unsigned int bit)
  11 {
  12         struct saa7146_vv *vv = dev->vv_data;
  13
  14         if (vv->resources & bit) {
  15                 DEB_D("already allocated! want: 0x%02x, cur:0x%02x\n",
  16                       bit, vv->resources);
  17                 /* have it already allocated */
  18                 return 1;
  19         }
  20
  21         /* is it free? */
  22         if (vv->resources & bit) {
  23                 DEB_D("locked! vv->resources:0x%02x, we want:0x%02x\n",
  24                       vv->resources, bit);
  25                 /* no, someone else uses it */
  26                 return 0;
  27         }
  28         /* it's free, grab it */
  29         vv->resources |= bit;
  30         DEB_D("res: get 0x%02x, cur:0x%02x\n", bit, vv->resources);
  31         return 1;
  32 }
  33
  34 void saa7146_res_free(struct saa7146_dev *dev, unsigned int bits)
  35 {
  36         struct saa7146_vv *vv = dev->vv_data;
  37
  38         WARN_ON((vv->resources & bits) != bits);
  39
  40         vv->resources &= ~bits;
  41         DEB_D("res: put 0x%02x, cur:0x%02x\n", bits, vv->resources);
  42 }
  43
  44
  45 /********************************************************************************/
  46 /* common buffer functions */
  47
  48 int saa7146_buffer_queue(struct saa7146_dev *dev,
  49                          struct saa7146_dmaqueue *q,
  50                          struct saa7146_buf *buf)
  51 {
  52         assert_spin_locked(&dev->slock);
  53         DEB_EE("dev:%p, dmaq:%p, buf:%p\n", dev, q, buf);
  54
  55         if (WARN_ON(!q))
  56                 return -EIO;
  57
  58         if (NULL == q->curr) {
  59                 q->curr = buf;
  60                 DEB_D("immediately activating buffer %p\n", buf);
  61                 buf->activate(dev,buf,NULL);
  62         } else {
  63                 list_add_tail(&buf->list, &q->queue);
  64                 DEB_D("adding buffer %p to queue. (active buffer present)\n",
  65                       buf);
  66         }
  67         return 0;
  68 }
  69
  70 void saa7146_buffer_finish(struct saa7146_dev *dev,
  71                            struct saa7146_dmaqueue *q,
  72                            int state)
  73 {
  74         struct saa7146_vv *vv = dev->vv_data;
  75         struct saa7146_buf *buf = q->curr;
  76
  77         assert_spin_locked(&dev->slock);
  78         DEB_EE("dev:%p, dmaq:%p, state:%d\n", dev, q, state);
  79         DEB_EE("q->curr:%p\n", q->curr);
  80
  81         /* finish current buffer */
  82         if (!buf) {
  83                 DEB_D("aiii. no current buffer\n");
  84                 return;
  85         }
  86
  87         q->curr = NULL;
  88         buf->vb.vb2_buf.timestamp = ktime_get_ns();
  89         if (vv->video_fmt.field == V4L2_FIELD_ALTERNATE)
  90                 buf->vb.field = vv->last_field;
  91         else if (vv->video_fmt.field == V4L2_FIELD_ANY)
  92                 buf->vb.field = (vv->video_fmt.height > vv->standard->v_max_out / 2)
  93                         ? V4L2_FIELD_INTERLACED
  94                         : V4L2_FIELD_BOTTOM;
  95         else
  96                 buf->vb.field = vv->video_fmt.field;
  97         buf->vb.sequence = vv->seqnr++;
  98         vb2_buffer_done(&buf->vb.vb2_buf, state);
  99 }
 100
 101 void saa7146_buffer_next(struct saa7146_dev *dev,
 102                          struct saa7146_dmaqueue *q, int vbi)
 103 {
 104         struct saa7146_buf *buf,*next = NULL;
 105
 106         if (WARN_ON(!q))
 107                 return;
 108
 109         DEB_INT("dev:%p, dmaq:%p, vbi:%d\n", dev, q, vbi);
 110
 111         assert_spin_locked(&dev->slock);
 112         if (!list_empty(&q->queue)) {
 113                 /* activate next one from queue */
 114                 buf = list_entry(q->queue.next, struct saa7146_buf, list);
 115                 list_del(&buf->list);
 116                 if (!list_empty(&q->queue))
 117                         next = list_entry(q->queue.next, struct saa7146_buf, list);
 118                 q->curr = buf;
 119                 DEB_INT("next buffer: buf:%p, prev:%p, next:%p\n",
 120                         buf, q->queue.prev, q->queue.next);
 121                 buf->activate(dev,buf,next);
 122         } else {
 123                 DEB_INT("no next buffer. stopping.\n");
 124                 if( 0 != vbi ) {
 125                         /* turn off video-dma3 */
 126                         saa7146_write(dev,MC1, MASK_20);
 127                 } else {
 128                         /* nothing to do -- just prevent next video-dma1 transfer
 129                            by lowering the protection address */
 130
 131                         // fixme: fix this for vflip != 0
 132
 133                         saa7146_write(dev, PROT_ADDR1, 0);
 134                         saa7146_write(dev, MC2, (MASK_02|MASK_18));
 135
 136                         /* write the address of the rps-program */
 137                         saa7146_write(dev, RPS_ADDR0, dev->d_rps0.dma_handle);
 138                         /* turn on rps */
 139                         saa7146_write(dev, MC1, (MASK_12 | MASK_28));
 140
 141 /*
 142                         printk("vdma%d.base_even:     0x%08x\n", 1,saa7146_read(dev,BASE_EVEN1));
 143                         printk("vdma%d.base_odd:      0x%08x\n", 1,saa7146_read(dev,BASE_ODD1));
 144                         printk("vdma%d.prot_addr:     0x%08x\n", 1,saa7146_read(dev,PROT_ADDR1));
 145                         printk("vdma%d.base_page:     0x%08x\n", 1,saa7146_read(dev,BASE_PAGE1));
 146                         printk("vdma%d.pitch:         0x%08x\n", 1,saa7146_read(dev,PITCH1));
 147                         printk("vdma%d.num_line_byte: 0x%08x\n", 1,saa7146_read(dev,NUM_LINE_BYTE1));
 148 */
 149                 }
 150                 del_timer(&q->timeout);
 151         }
 152 }
 153
 154 void saa7146_buffer_timeout(struct timer_list *t)
 155 {
 156         struct saa7146_dmaqueue *q = from_timer(q, t, timeout);
 157         struct saa7146_dev *dev = q->dev;
 158         unsigned long flags;
 159
 160         DEB_EE("dev:%p, dmaq:%p\n", dev, q);
 161
 162         spin_lock_irqsave(&dev->slock,flags);
 163         if (q->curr) {
 164                 DEB_D("timeout on %p\n", q->curr);
 165                 saa7146_buffer_finish(dev, q, VB2_BUF_STATE_ERROR);
 166         }
 167
 168         /* we don't restart the transfer here like other drivers do. when
 169            a streaming capture is disabled, the timeout function will be
 170            called for the current buffer. if we activate the next buffer now,
 171            we mess up our capture logic. if a timeout occurs on another buffer,
 172            then something is seriously broken before, so no need to buffer the
 173            next capture IMHO... */
 174
 175         saa7146_buffer_next(dev, q, 0);
 176
 177         spin_unlock_irqrestore(&dev->slock,flags);
 178 }
 179
 180 /********************************************************************************/
 181 /* file operations */
 182
 183 static ssize_t fops_write(struct file *file, const char __user *data, size_t count, loff_t *ppos)
 184 {
 185         struct video_device *vdev = video_devdata(file);
 186         struct saa7146_dev *dev = video_drvdata(file);
 187         int ret;
 188
 189         if (vdev->vfl_type != VFL_TYPE_VBI || !dev->ext_vv_data->vbi_fops.write)
 190                 return -EINVAL;
 191         if (mutex_lock_interruptible(vdev->lock))
 192                 return -ERESTARTSYS;
 193         ret = dev->ext_vv_data->vbi_fops.write(file, data, count, ppos);
 194         mutex_unlock(vdev->lock);
 195         return ret;
 196 }
 197
 198 static const struct v4l2_file_operations video_fops =
 199 {
 200         .owner          = THIS_MODULE,
 201         .open           = v4l2_fh_open,
 202         .release        = vb2_fop_release,
 203         .read           = vb2_fop_read,
 204         .write          = fops_write,
 205         .poll           = vb2_fop_poll,
 206         .mmap           = vb2_fop_mmap,
 207         .unlocked_ioctl = video_ioctl2,
 208 };
 209
 210 static void vv_callback(struct saa7146_dev *dev, unsigned long status)
 211 {
 212         u32 isr = status;
 213
 214         DEB_INT("dev:%p, isr:0x%08x\n", dev, (u32)status);
 215
 216         if (0 != (isr & (MASK_27))) {
 217                 DEB_INT("irq: RPS0 (0x%08x)\n", isr);
 218                 saa7146_video_uops.irq_done(dev,isr);
 219         }
 220
 221         if (0 != (isr & (MASK_28))) {
 222                 u32 mc2 = saa7146_read(dev, MC2);
 223                 if( 0 != (mc2 & MASK_15)) {
 224                         DEB_INT("irq: RPS1 vbi workaround (0x%08x)\n", isr);
 225                         wake_up(&dev->vv_data->vbi_wq);
 226                         saa7146_write(dev,MC2, MASK_31);
 227                         return;
 228                 }
 229                 DEB_INT("irq: RPS1 (0x%08x)\n", isr);
 230                 saa7146_vbi_uops.irq_done(dev,isr);
 231         }
 232 }
 233
 234 static const struct v4l2_ctrl_ops saa7146_ctrl_ops = {
 235         .s_ctrl = saa7146_s_ctrl,
 236 };
 237
 238 int saa7146_vv_init(struct saa7146_dev* dev, struct saa7146_ext_vv *ext_vv)
 239 {
 240         struct v4l2_ctrl_handler *hdl = &dev->ctrl_handler;
 241         struct v4l2_pix_format *fmt;
 242         struct v4l2_vbi_format *vbi;
 243         struct saa7146_vv *vv;
 244         int err;
 245
 246         err = v4l2_device_register(&dev->pci->dev, &dev->v4l2_dev);
 247         if (err)
 248                 return err;
 249
 250         v4l2_ctrl_handler_init(hdl, 6);
 251         v4l2_ctrl_new_std(hdl, &saa7146_ctrl_ops,
 252                 V4L2_CID_BRIGHTNESS, 0, 255, 1, 128);
 253         v4l2_ctrl_new_std(hdl, &saa7146_ctrl_ops,
 254                 V4L2_CID_CONTRAST, 0, 127, 1, 64);
 255         v4l2_ctrl_new_std(hdl, &saa7146_ctrl_ops,
 256                 V4L2_CID_SATURATION, 0, 127, 1, 64);
 257         v4l2_ctrl_new_std(hdl, &saa7146_ctrl_ops,
 258                 V4L2_CID_VFLIP, 0, 1, 1, 0);
 259         v4l2_ctrl_new_std(hdl, &saa7146_ctrl_ops,
 260                 V4L2_CID_HFLIP, 0, 1, 1, 0);
 261         if (hdl->error) {
 262                 err = hdl->error;
 263                 v4l2_ctrl_handler_free(hdl);
 264                 v4l2_device_unregister(&dev->v4l2_dev);
 265                 return err;
 266         }
 267         dev->v4l2_dev.ctrl_handler = hdl;
 268
 269         vv = kzalloc(sizeof(struct saa7146_vv), GFP_KERNEL);
 270         if (vv == NULL) {
 271                 ERR("out of memory. aborting.\n");
 272                 v4l2_ctrl_handler_free(hdl);
 273                 v4l2_device_unregister(&dev->v4l2_dev);
 274                 return -ENOMEM;
 275         }
 276         ext_vv->vid_ops = saa7146_video_ioctl_ops;
 277         ext_vv->vbi_ops = saa7146_vbi_ioctl_ops;
 278         ext_vv->core_ops = &saa7146_video_ioctl_ops;
 279
 280         DEB_EE("dev:%p\n", dev);
 281
 282         /* set default values for video parts of the saa7146 */
 283         saa7146_write(dev, BCS_CTRL, 0x80400040);
 284
 285         /* enable video-port pins */
 286         saa7146_write(dev, MC1, (MASK_10 | MASK_26));
 287
 288         /* save per-device extension data (one extension can
 289            handle different devices that might need different
 290            configuration data) */
 291         dev->ext_vv_data = ext_vv;
 292
 293         saa7146_video_uops.init(dev,vv);
 294         if (dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
 295                 saa7146_vbi_uops.init(dev,vv);
 296
 297         fmt = &vv->video_fmt;
 298         fmt->width = 384;
 299         fmt->height = 288;
 300         fmt->pixelformat = V4L2_PIX_FMT_BGR24;
 301         fmt->field = V4L2_FIELD_INTERLACED;
 302         fmt->colorspace = V4L2_COLORSPACE_SMPTE170M;
 303         fmt->bytesperline = 3 * fmt->width;
 304         fmt->sizeimage = fmt->bytesperline * fmt->height;
 305
 306         vbi = &vv->vbi_fmt;
 307         vbi->sampling_rate      = 27000000;
 308         vbi->offset             = 248; /* todo */
 309         vbi->samples_per_line   = 720 * 2;
 310         vbi->sample_format      = V4L2_PIX_FMT_GREY;
 311
 312         /* fixme: this only works for PAL */
 313         vbi->start[0] = 5;
 314         vbi->count[0] = 16;
 315         vbi->start[1] = 312;
 316         vbi->count[1] = 16;
 317
 318         timer_setup(&vv->vbi_read_timeout, NULL, 0);
 319
 320         dev->vv_data = vv;
 321         dev->vv_callback = &vv_callback;
 322
 323         return 0;
 324 }
 325 EXPORT_SYMBOL_GPL(saa7146_vv_init);
 326
 327 int saa7146_vv_release(struct saa7146_dev* dev)
 328 {
 329         struct saa7146_vv *vv = dev->vv_data;
 330
 331         DEB_EE("dev:%p\n", dev);
 332
 333         v4l2_device_unregister(&dev->v4l2_dev);
 334         v4l2_ctrl_handler_free(&dev->ctrl_handler);
 335         kfree(vv);
 336         dev->vv_data = NULL;
 337         dev->vv_callback = NULL;
 338
 339         return 0;
 340 }
 341 EXPORT_SYMBOL_GPL(saa7146_vv_release);
 342
 343 int saa7146_register_device(struct video_device *vfd, struct saa7146_dev *dev,
 344                             char *name, int type)
 345 {
 346         struct vb2_queue *q;
 347         int err;
 348         int i;
 349
 350         DEB_EE("dev:%p, name:'%s', type:%d\n", dev, name, type);
 351
 352         vfd->fops = &video_fops;
 353         if (type == VFL_TYPE_VIDEO) {
 354                 vfd->ioctl_ops = &dev->ext_vv_data->vid_ops;
 355                 q = &dev->vv_data->video_dmaq.q;
 356         } else {
 357                 vfd->ioctl_ops = &dev->ext_vv_data->vbi_ops;
 358                 q = &dev->vv_data->vbi_dmaq.q;
 359         }
 360         vfd->release = video_device_release_empty;
 361         vfd->lock = &dev->v4l2_lock;
 362         vfd->v4l2_dev = &dev->v4l2_dev;
 363         vfd->tvnorms = 0;
 364         for (i = 0; i < dev->ext_vv_data->num_stds; i++)
 365                 vfd->tvnorms |= dev->ext_vv_data->stds[i].id;
 366         strscpy(vfd->name, name, sizeof(vfd->name));
 367         vfd->device_caps = V4L2_CAP_VIDEO_CAPTURE |
 368                            V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
 369         vfd->device_caps |= dev->ext_vv_data->capabilities;
 370         if (type == VFL_TYPE_VIDEO) {
 371                 vfd->device_caps &=
 372                         ~(V4L2_CAP_VBI_CAPTURE | V4L2_CAP_SLICED_VBI_OUTPUT);
 373         } else if (vfd->device_caps & V4L2_CAP_SLICED_VBI_OUTPUT) {
 374                 vfd->vfl_dir = VFL_DIR_TX;
 375                 vfd->device_caps &= ~(V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING |
 376                                       V4L2_CAP_AUDIO | V4L2_CAP_TUNER);
 377         } else {
 378                 vfd->device_caps &= ~V4L2_CAP_VIDEO_CAPTURE;
 379         }
 380
 381         q->type = type == VFL_TYPE_VIDEO ? V4L2_BUF_TYPE_VIDEO_CAPTURE : V4L2_BUF_TYPE_VBI_CAPTURE;
 382         q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
 383         q->io_modes = VB2_MMAP | VB2_READ | VB2_DMABUF;
 384         q->ops = type == VFL_TYPE_VIDEO ? &video_qops : &vbi_qops;
 385         q->mem_ops = &vb2_dma_sg_memops;
 386         q->drv_priv = dev;
 387         q->gfp_flags = __GFP_DMA32;
 388         q->buf_struct_size = sizeof(struct saa7146_buf);
 389         q->lock = &dev->v4l2_lock;
 390         q->min_queued_buffers = 2;
 391         q->dev = &dev->pci->dev;
 392         err = vb2_queue_init(q);
 393         if (err)
 394                 return err;
 395         vfd->queue = q;
 396
 397         video_set_drvdata(vfd, dev);
 398
 399         err = video_register_device(vfd, type, -1);
 400         if (err < 0) {
 401                 ERR("cannot register v4l2 device. skipping.\n");
 402                 return err;
 403         }
 404
 405         pr_info("%s: registered device %s [v4l2]\n",
 406                 dev->name, video_device_node_name(vfd));
 407         return 0;
 408 }
 409 EXPORT_SYMBOL_GPL(saa7146_register_device);
 410
 411 int saa7146_unregister_device(struct video_device *vfd, struct saa7146_dev *dev)
 412 {
 413         DEB_EE("dev:%p\n", dev);
 414
 415         video_unregister_device(vfd);
 416         return 0;
 417 }
 418 EXPORT_SYMBOL_GPL(saa7146_unregister_device);
 419
 420 static int __init saa7146_vv_init_module(void)
 421 {
 422         return 0;
 423 }
 424
 425
 426 static void __exit saa7146_vv_cleanup_module(void)
 427 {
 428 }
 429
 430 module_init(saa7146_vv_init_module);
 431 module_exit(saa7146_vv_cleanup_module);
 432
 433 MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
 434 MODULE_DESCRIPTION("video4linux driver for saa7146-based hardware");
 435 MODULE_LICENSE("GPL");