[media] saa7134: share resource management between normal and empress nodes
authorHans Verkuil <hans.verkuil@cisco.com>
Sat, 14 Dec 2013 11:28:27 +0000 (08:28 -0300)
committerMauro Carvalho Chehab <m.chehab@samsung.com>
Tue, 7 Jan 2014 09:37:10 +0000 (07:37 -0200)
The empress video node can share resource management with the normal
video nodes, thus allowing for code sharing and making the empress node
non-exclusive.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
drivers/media/pci/saa7134/saa7134-empress.c
drivers/media/pci/saa7134/saa7134-video.c
drivers/media/pci/saa7134/saa7134.h

index 17e5fcd..2ef670d 100644 (file)
@@ -86,20 +86,11 @@ static int ts_open(struct file *file)
        struct video_device *vdev = video_devdata(file);
        struct saa7134_dev *dev = video_drvdata(file);
        struct saa7134_fh *fh;
-       int err;
-
-       dprintk("open dev=%s\n", video_device_node_name(vdev));
-       err = -EBUSY;
-       if (!mutex_trylock(&dev->empress_tsq.vb_lock))
-               return err;
-       if (atomic_read(&dev->empress_users))
-               goto done;
 
        /* allocate + initialize per filehandle data */
        fh = kzalloc(sizeof(*fh), GFP_KERNEL);
-       err = -ENOMEM;
        if (NULL == fh)
-               goto done;
+               return -ENOMEM;
 
        v4l2_fh_init(&fh->fh, vdev);
        file->private_data = fh;
@@ -110,12 +101,7 @@ static int ts_open(struct file *file)
        saa_writeb(SAA7134_AUDIO_MUTE_CTRL,
                saa_readb(SAA7134_AUDIO_MUTE_CTRL) & ~(1 << 6));
 
-       atomic_inc(&dev->empress_users);
-       err = 0;
-
-done:
-       mutex_unlock(&dev->empress_tsq.vb_lock);
-       return err;
+       return 0;
 }
 
 static int ts_release(struct file *file)
@@ -123,17 +109,17 @@ static int ts_release(struct file *file)
        struct saa7134_dev *dev = video_drvdata(file);
        struct saa7134_fh *fh = file->private_data;
 
-       videobuf_stop(&dev->empress_tsq);
-       videobuf_mmap_free(&dev->empress_tsq);
+       if (res_check(fh, RESOURCE_EMPRESS)) {
+               videobuf_stop(&dev->empress_tsq);
+               videobuf_mmap_free(&dev->empress_tsq);
 
-       /* stop the encoder */
-       ts_reset_encoder(dev);
+               /* stop the encoder */
+               ts_reset_encoder(dev);
 
-       /* Mute audio */
-       saa_writeb(SAA7134_AUDIO_MUTE_CTRL,
-               saa_readb(SAA7134_AUDIO_MUTE_CTRL) | (1 << 6));
-
-       atomic_dec(&dev->empress_users);
+               /* Mute audio */
+               saa_writeb(SAA7134_AUDIO_MUTE_CTRL,
+                               saa_readb(SAA7134_AUDIO_MUTE_CTRL) | (1 << 6));
+       }
 
        v4l2_fh_del(&fh->fh);
        v4l2_fh_exit(&fh->fh);
@@ -145,6 +131,8 @@ ts_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
 {
        struct saa7134_dev *dev = video_drvdata(file);
 
+       if (res_locked(dev, RESOURCE_EMPRESS))
+               return -EBUSY;
        if (!dev->empress_started)
                ts_init_encoder(dev);
 
@@ -235,53 +223,6 @@ static int empress_try_fmt_vid_cap(struct file *file, void *priv,
        return 0;
 }
 
-static int empress_reqbufs(struct file *file, void *priv,
-                                       struct v4l2_requestbuffers *p)
-{
-       struct saa7134_dev *dev = video_drvdata(file);
-
-       return videobuf_reqbufs(&dev->empress_tsq, p);
-}
-
-static int empress_querybuf(struct file *file, void *priv,
-                                       struct v4l2_buffer *b)
-{
-       struct saa7134_dev *dev = video_drvdata(file);
-
-       return videobuf_querybuf(&dev->empress_tsq, b);
-}
-
-static int empress_qbuf(struct file *file, void *priv, struct v4l2_buffer *b)
-{
-       struct saa7134_dev *dev = video_drvdata(file);
-
-       return videobuf_qbuf(&dev->empress_tsq, b);
-}
-
-static int empress_dqbuf(struct file *file, void *priv, struct v4l2_buffer *b)
-{
-       struct saa7134_dev *dev = video_drvdata(file);
-
-       return videobuf_dqbuf(&dev->empress_tsq, b,
-                               file->f_flags & O_NONBLOCK);
-}
-
-static int empress_streamon(struct file *file, void *priv,
-                                       enum v4l2_buf_type type)
-{
-       struct saa7134_dev *dev = video_drvdata(file);
-
-       return videobuf_streamon(&dev->empress_tsq);
-}
-
-static int empress_streamoff(struct file *file, void *priv,
-                                       enum v4l2_buf_type type)
-{
-       struct saa7134_dev *dev = video_drvdata(file);
-
-       return videobuf_streamoff(&dev->empress_tsq);
-}
-
 static const struct v4l2_file_operations ts_fops =
 {
        .owner    = THIS_MODULE,
@@ -299,12 +240,12 @@ static const struct v4l2_ioctl_ops ts_ioctl_ops = {
        .vidioc_try_fmt_vid_cap         = empress_try_fmt_vid_cap,
        .vidioc_s_fmt_vid_cap           = empress_s_fmt_vid_cap,
        .vidioc_g_fmt_vid_cap           = empress_g_fmt_vid_cap,
-       .vidioc_reqbufs                 = empress_reqbufs,
-       .vidioc_querybuf                = empress_querybuf,
-       .vidioc_qbuf                    = empress_qbuf,
-       .vidioc_dqbuf                   = empress_dqbuf,
-       .vidioc_streamon                = empress_streamon,
-       .vidioc_streamoff               = empress_streamoff,
+       .vidioc_reqbufs                 = saa7134_reqbufs,
+       .vidioc_querybuf                = saa7134_querybuf,
+       .vidioc_qbuf                    = saa7134_qbuf,
+       .vidioc_dqbuf                   = saa7134_dqbuf,
+       .vidioc_streamon                = saa7134_streamon,
+       .vidioc_streamoff               = saa7134_streamoff,
        .vidioc_g_frequency             = saa7134_g_frequency,
        .vidioc_s_frequency             = saa7134_s_frequency,
        .vidioc_g_tuner                 = saa7134_g_tuner,
@@ -375,6 +316,7 @@ static int empress_init(struct saa7134_dev *dev)
        snprintf(dev->empress_dev->name, sizeof(dev->empress_dev->name),
                 "%s empress (%s)", dev->name,
                 saa7134_boards[dev->board].name);
+       set_bit(V4L2_FL_USE_FH_PRIO, &dev->empress_dev->flags);
        v4l2_ctrl_handler_init(hdl, 21);
        v4l2_ctrl_add_handler(hdl, &dev->ctrl_handler, empress_ctrl_filter);
        if (dev->empress_sd)
index 7ba42e2..5e2d61c 100644 (file)
@@ -403,16 +403,6 @@ static int res_get(struct saa7134_dev *dev, struct saa7134_fh *fh, unsigned int
        return 1;
 }
 
-static int res_check(struct saa7134_fh *fh, unsigned int bit)
-{
-       return (fh->resources & bit);
-}
-
-static int res_locked(struct saa7134_dev *dev, unsigned int bit)
-{
-       return (dev->resources & bit);
-}
-
 static
 void res_free(struct saa7134_dev *dev, struct saa7134_fh *fh, unsigned int bits)
 {
@@ -1091,11 +1081,12 @@ static struct videobuf_queue *saa7134_queue(struct file *file)
 {
        struct video_device *vdev = video_devdata(file);
        struct saa7134_dev *dev = video_drvdata(file);
+       struct saa7134_fh *fh = file->private_data;
        struct videobuf_queue *q = NULL;
 
        switch (vdev->vfl_type) {
        case VFL_TYPE_GRABBER:
-               q = &dev->cap;
+               q = fh->is_empress ? &dev->empress_tsq : &dev->cap;
                break;
        case VFL_TYPE_VBI:
                q = &dev->vbi;
@@ -1109,9 +1100,10 @@ static struct videobuf_queue *saa7134_queue(struct file *file)
 static int saa7134_resource(struct file *file)
 {
        struct video_device *vdev = video_devdata(file);
+       struct saa7134_fh *fh = file->private_data;
 
        if (vdev->vfl_type == VFL_TYPE_GRABBER)
-               return RESOURCE_VIDEO;
+               return fh->is_empress ? RESOURCE_EMPRESS : RESOURCE_VIDEO;
 
        if (vdev->vfl_type == VFL_TYPE_VBI)
                return RESOURCE_VBI;
@@ -1935,30 +1927,34 @@ static int saa7134_overlay(struct file *file, void *priv, unsigned int on)
        return 0;
 }
 
-static int saa7134_reqbufs(struct file *file, void *priv,
+int saa7134_reqbufs(struct file *file, void *priv,
                                        struct v4l2_requestbuffers *p)
 {
        return videobuf_reqbufs(saa7134_queue(file), p);
 }
+EXPORT_SYMBOL_GPL(saa7134_reqbufs);
 
-static int saa7134_querybuf(struct file *file, void *priv,
+int saa7134_querybuf(struct file *file, void *priv,
                                        struct v4l2_buffer *b)
 {
        return videobuf_querybuf(saa7134_queue(file), b);
 }
+EXPORT_SYMBOL_GPL(saa7134_querybuf);
 
-static int saa7134_qbuf(struct file *file, void *priv, struct v4l2_buffer *b)
+int saa7134_qbuf(struct file *file, void *priv, struct v4l2_buffer *b)
 {
        return videobuf_qbuf(saa7134_queue(file), b);
 }
+EXPORT_SYMBOL_GPL(saa7134_qbuf);
 
-static int saa7134_dqbuf(struct file *file, void *priv, struct v4l2_buffer *b)
+int saa7134_dqbuf(struct file *file, void *priv, struct v4l2_buffer *b)
 {
        return videobuf_dqbuf(saa7134_queue(file), b,
                                file->f_flags & O_NONBLOCK);
 }
+EXPORT_SYMBOL_GPL(saa7134_dqbuf);
 
-static int saa7134_streamon(struct file *file, void *priv,
+int saa7134_streamon(struct file *file, void *priv,
                                        enum v4l2_buf_type type)
 {
        struct saa7134_dev *dev = video_drvdata(file);
@@ -1974,21 +1970,23 @@ static int saa7134_streamon(struct file *file, void *priv,
         * Unfortunately, I lack register-level documentation to check the
         * Linux FIFO setup and confirm the perfect value.
         */
-       pm_qos_add_request(&dev->qos_request,
-                          PM_QOS_CPU_DMA_LATENCY,
-                          20);
+       if (res != RESOURCE_EMPRESS)
+               pm_qos_add_request(&dev->qos_request,
+                          PM_QOS_CPU_DMA_LATENCY, 20);
 
        return videobuf_streamon(saa7134_queue(file));
 }
+EXPORT_SYMBOL_GPL(saa7134_streamon);
 
-static int saa7134_streamoff(struct file *file, void *priv,
+int saa7134_streamoff(struct file *file, void *priv,
                                        enum v4l2_buf_type type)
 {
        struct saa7134_dev *dev = video_drvdata(file);
        int err;
        int res = saa7134_resource(file);
 
-       pm_qos_remove_request(&dev->qos_request);
+       if (res != RESOURCE_EMPRESS)
+               pm_qos_remove_request(&dev->qos_request);
 
        err = videobuf_streamoff(saa7134_queue(file));
        if (err < 0)
@@ -1996,6 +1994,7 @@ static int saa7134_streamoff(struct file *file, void *priv,
        res_free(dev, priv, res);
        return 0;
 }
+EXPORT_SYMBOL_GPL(saa7134_streamoff);
 
 #ifdef CONFIG_VIDEO_ADV_DEBUG
 static int vidioc_g_register (struct file *file, void *priv,
index d7bef5e..2474e84 100644 (file)
@@ -422,6 +422,7 @@ struct saa7134_board {
 #define RESOURCE_OVERLAY       1
 #define RESOURCE_VIDEO         2
 #define RESOURCE_VBI           4
+#define RESOURCE_EMPRESS       8
 
 #define INTERLACE_AUTO         0
 #define INTERLACE_ON           1
@@ -644,7 +645,6 @@ struct saa7134_dev {
        struct video_device        *empress_dev;
        struct v4l2_subdev         *empress_sd;
        struct videobuf_queue      empress_tsq;
-       atomic_t                   empress_users;
        struct work_struct         empress_workqueue;
        int                        empress_started;
        struct v4l2_ctrl_handler   empress_ctrl_handler;
@@ -705,6 +705,16 @@ struct saa7134_dev {
        _rc;                                                            \
 })
 
+static inline int res_check(struct saa7134_fh *fh, unsigned int bit)
+{
+       return fh->resources & bit;
+}
+
+static inline int res_locked(struct saa7134_dev *dev, unsigned int bit)
+{
+       return dev->resources & bit;
+}
+
 /* ----------------------------------------------------------- */
 /* saa7134-core.c                                              */
 
@@ -782,6 +792,16 @@ int saa7134_g_frequency(struct file *file, void *priv,
                                        struct v4l2_frequency *f);
 int saa7134_s_frequency(struct file *file, void *priv,
                                        const struct v4l2_frequency *f);
+int saa7134_reqbufs(struct file *file, void *priv,
+                                       struct v4l2_requestbuffers *p);
+int saa7134_querybuf(struct file *file, void *priv,
+                                       struct v4l2_buffer *b);
+int saa7134_qbuf(struct file *file, void *priv, struct v4l2_buffer *b);
+int saa7134_dqbuf(struct file *file, void *priv, struct v4l2_buffer *b);
+int saa7134_streamon(struct file *file, void *priv,
+                                       enum v4l2_buf_type type);
+int saa7134_streamoff(struct file *file, void *priv,
+                                       enum v4l2_buf_type type);
 
 int saa7134_videoport_init(struct saa7134_dev *dev);
 void saa7134_set_tvnorm_hw(struct saa7134_dev *dev);