From: Hans Verkuil <hans.verkuil@xxxxxxxxx>
I know, nobody really cares about this black-and-white webcam anymore, but
it was fun to do.
Tested with an actual webcam.
Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
---
drivers/media/parport/Kconfig | 1 +
drivers/media/parport/bw-qcam.c | 157 +++++++++++++++++++++++++++------------
2 files changed, 112 insertions(+), 46 deletions(-)
diff --git a/drivers/media/parport/Kconfig b/drivers/media/parport/Kconfig
index ece13dc..948c981 100644
--- a/drivers/media/parport/Kconfig
+++ b/drivers/media/parport/Kconfig
@@ -9,6 +9,7 @@ if MEDIA_PARPORT_SUPPORT
config VIDEO_BWQCAM
tristate "Quickcam BW Video For Linux"
depends on PARPORT && VIDEO_V4L2
+ select VIDEOBUF2_VMALLOC
help
Say Y have if you the black and white version of the QuickCam
camera. See the next option for the color version.
diff --git a/drivers/media/parport/bw-qcam.c b/drivers/media/parport/bw-qcam.c
index 497b342..d3fe34f 100644
--- a/drivers/media/parport/bw-qcam.c
+++ b/drivers/media/parport/bw-qcam.c
@@ -80,6 +80,7 @@ OTHER DEALINGS IN THE SOFTWARE.
#include <media/v4l2-fh.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-event.h>
+#include <media/videobuf2-vmalloc.h>
/* One from column A... */
#define QC_NOTSET 0
@@ -107,9 +108,11 @@ struct qcam {
struct v4l2_device v4l2_dev;
struct video_device vdev;
struct v4l2_ctrl_handler hdl;
+ struct vb2_queue vb_vidq;
struct pardevice *pdev;
struct parport *pport;
struct mutex lock;
+ struct mutex queue_lock;
int width, height;
int bpp;
int mode;
@@ -558,7 +561,7 @@ static inline int qc_readbytes(struct qcam *q, char buffer[])
* n=2^(bit depth)-1. Ask me for more details if you don't understand
* this. */
-static long qc_capture(struct qcam *q, char __user *buf, unsigned long len)
+static long qc_capture(struct qcam *q, u8 *buf, unsigned long len)
{
int i, j, k, yield;
int bytes;
@@ -609,7 +612,7 @@ static long qc_capture(struct qcam *q, char __user *buf, unsigned long len)
if (o < len) {
u8 ch = invert - buffer[k];
got++;
- put_user(ch << shift, buf + o);
+ buf[o] = ch << shift;
}
}
pixels_read += bytes;
@@ -639,6 +642,67 @@ static long qc_capture(struct qcam *q, char __user *buf, unsigned long len)
return len;
}
+/* ------------------------------------------------------------------
+ Videobuf operations
+ ------------------------------------------------------------------*/
+static int queue_setup(struct vb2_queue *vq, const struct v4l2_format *fmt,
+ unsigned int *nbuffers, unsigned int *nplanes,
+ unsigned int sizes[], void *alloc_ctxs[])
+{
+ struct qcam *dev = vb2_get_drv_priv(vq);
+
+ if (0 == *nbuffers)
+ *nbuffers = 3;
+ *nplanes = 1;
+ mutex_lock(&dev->lock);
+ if (fmt)
+ sizes[0] = fmt->fmt.pix.width * fmt->fmt.pix.height;
+ else
+ sizes[0] = (dev->width / dev->transfer_scale) *
+ (dev->height / dev->transfer_scale);
+ mutex_unlock(&dev->lock);
+ return 0;
+}
+
+static void buffer_queue(struct vb2_buffer *vb)
+{
+ vb2_buffer_done(vb, VB2_BUF_STATE_DONE);
+}
+
+static int buffer_finish(struct vb2_buffer *vb)
+{
+ struct qcam *qcam = vb2_get_drv_priv(vb->vb2_queue);
+ void *vbuf = vb2_plane_vaddr(vb, 0);
+ int size = vb->vb2_queue->plane_sizes[0];
+ int len;
+
+ mutex_lock(&qcam->lock);
+ parport_claim_or_block(qcam->pdev);
+
+ qc_reset(qcam);
+
+ /* Update the camera parameters if we need to */
+ if (qcam->status & QC_PARAM_CHANGE)
+ qc_set(qcam);
+
+ len = qc_capture(qcam, vbuf, size);
+
+ parport_release(qcam->pdev);
+ mutex_unlock(&qcam->lock);
+ if (len != size)
+ vb->state = VB2_BUF_STATE_ERROR;
+ vb2_set_plane_payload(vb, 0, len);
+ return 0;
+}
+
+static struct vb2_ops qcam_video_qops = {
+ .queue_setup = queue_setup,
+ .buf_queue = buffer_queue,
+ .buf_finish = buffer_finish,
+ .wait_prepare = vb2_ops_wait_prepare,
+ .wait_finish = vb2_ops_wait_finish,
+};
+
/*
* Video4linux interfacing
*/
@@ -651,7 +715,8 @@ static int qcam_querycap(struct file *file, void *priv,
strlcpy(vcap->driver, qcam->v4l2_dev.name, sizeof(vcap->driver));
strlcpy(vcap->card, "Connectix B&W Quickcam", sizeof(vcap->card));
strlcpy(vcap->bus_info, qcam->pport->name, sizeof(vcap->bus_info));
- vcap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE;
+ vcap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE |
+ V4L2_CAP_STREAMING;
vcap->capabilities = vcap->device_caps | V4L2_CAP_DEVICE_CAPS;
return 0;
}
@@ -731,6 +796,8 @@ static int qcam_s_fmt_vid_cap(struct file *file, void *fh, struct v4l2_format *f
if (ret)
return ret;
+ if (vb2_is_busy(&qcam->vb_vidq))
+ return -EBUSY;
qcam->width = 320;
qcam->height = 240;
if (pix->height == 60)
@@ -744,12 +811,10 @@ static int qcam_s_fmt_vid_cap(struct file *file, void *fh, struct v4l2_format *f
else
qcam->bpp = 4;
- mutex_lock(&qcam->lock);
qc_setscanmode(qcam);
/* We must update the camera before we grab. We could
just have changed the grab size */
qcam->status |= QC_PARAM_CHANGE;
- mutex_unlock(&qcam->lock);
return 0;
}
@@ -794,41 +859,12 @@ static int qcam_enum_framesizes(struct file *file, void *fh,
return 0;
}
-static ssize_t qcam_read(struct file *file, char __user *buf,
- size_t count, loff_t *ppos)
-{
- struct qcam *qcam = video_drvdata(file);
- int len;
- parport_claim_or_block(qcam->pdev);
-
- mutex_lock(&qcam->lock);
-
- qc_reset(qcam);
-
- /* Update the camera parameters if we need to */
- if (qcam->status & QC_PARAM_CHANGE)
- qc_set(qcam);
-
- len = qc_capture(qcam, buf, count);
-
- mutex_unlock(&qcam->lock);
-
- parport_release(qcam->pdev);
- return len;
-}
-
-static unsigned int qcam_poll(struct file *filp, poll_table *wait)
-{
- return v4l2_ctrl_poll(filp, wait) | POLLIN | POLLRDNORM;
-}
-
static int qcam_s_ctrl(struct v4l2_ctrl *ctrl)
{
struct qcam *qcam =
container_of(ctrl->handler, struct qcam, hdl);
int ret = 0;
- mutex_lock(&qcam->lock);
switch (ctrl->id) {
case V4L2_CID_BRIGHTNESS:
qcam->brightness = ctrl->val;
@@ -847,17 +883,17 @@ static int qcam_s_ctrl(struct v4l2_ctrl *ctrl)
qc_setscanmode(qcam);
qcam->status |= QC_PARAM_CHANGE;
}
- mutex_unlock(&qcam->lock);
return ret;
}
static const struct v4l2_file_operations qcam_fops = {
.owner = THIS_MODULE,
.open = v4l2_fh_open,
- .release = v4l2_fh_release,
- .poll = qcam_poll,
+ .release = vb2_fop_release,
+ .poll = vb2_fop_poll,
.unlocked_ioctl = video_ioctl2,
- .read = qcam_read,
+ .read = vb2_fop_read,
+ .mmap = vb2_fop_mmap,
};
static const struct v4l2_ioctl_ops qcam_ioctl_ops = {
@@ -870,6 +906,14 @@ static const struct v4l2_ioctl_ops qcam_ioctl_ops = {
.vidioc_g_fmt_vid_cap = qcam_g_fmt_vid_cap,
.vidioc_s_fmt_vid_cap = qcam_s_fmt_vid_cap,
.vidioc_try_fmt_vid_cap = qcam_try_fmt_vid_cap,
+ .vidioc_reqbufs = vb2_ioctl_reqbufs,
+ .vidioc_create_bufs = vb2_ioctl_create_bufs,
+ .vidioc_prepare_buf = vb2_ioctl_prepare_buf,
+ .vidioc_querybuf = vb2_ioctl_querybuf,
+ .vidioc_qbuf = vb2_ioctl_qbuf,
+ .vidioc_dqbuf = vb2_ioctl_dqbuf,
+ .vidioc_streamon = vb2_ioctl_streamon,
+ .vidioc_streamoff = vb2_ioctl_streamoff,
.vidioc_log_status = v4l2_ctrl_log_status,
.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
@@ -886,6 +930,8 @@ static struct qcam *qcam_init(struct parport *port)
{
struct qcam *qcam;
struct v4l2_device *v4l2_dev;
+ struct vb2_queue *q;
+ int err;
qcam = kzalloc(sizeof(struct qcam), GFP_KERNEL);
if (qcam == NULL)
@@ -909,31 +955,45 @@ static struct qcam *qcam_init(struct parport *port)
V4L2_CID_GAMMA, 0, 255, 1, 105);
if (qcam->hdl.error) {
v4l2_err(v4l2_dev, "couldn't register controls\n");
- v4l2_ctrl_handler_free(&qcam->hdl);
- kfree(qcam);
- return NULL;
+ goto exit;
+ }
+
+ mutex_init(&qcam->lock);
+ mutex_init(&qcam->queue_lock);
+
+ /* initialize queue */
+ q = &qcam->vb_vidq;
+ q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+ q->io_modes = VB2_MMAP | VB2_USERPTR | VB2_READ;
+ q->drv_priv = qcam;
+ q->ops = &qcam_video_qops;
+ q->mem_ops = &vb2_vmalloc_memops;
+ err = vb2_queue_init(q);
+ if (err < 0) {
+ v4l2_err(v4l2_dev, "couldn't init vb2_queue for %s.\n", port->name);
+ goto exit;
}
+ qcam->vdev.queue = q;
+ qcam->vdev.queue->lock = &qcam->queue_lock;
+
qcam->pport = port;
qcam->pdev = parport_register_device(port, v4l2_dev->name, NULL, NULL,
NULL, 0, NULL);
if (qcam->pdev == NULL) {
v4l2_err(v4l2_dev, "couldn't register for %s.\n", port->name);
- v4l2_ctrl_handler_free(&qcam->hdl);
- kfree(qcam);
- return NULL;
+ goto exit;
}
strlcpy(qcam->vdev.name, "Connectix QuickCam", sizeof(qcam->vdev.name));
qcam->vdev.v4l2_dev = v4l2_dev;
qcam->vdev.ctrl_handler = &qcam->hdl;
qcam->vdev.fops = &qcam_fops;
+ qcam->vdev.lock = &qcam->lock;
qcam->vdev.ioctl_ops = &qcam_ioctl_ops;
set_bit(V4L2_FL_USE_FH_PRIO, &qcam->vdev.flags);
qcam->vdev.release = video_device_release_empty;
video_set_drvdata(&qcam->vdev, qcam);
- mutex_init(&qcam->lock);
-
qcam->port_mode = (QC_ANY | QC_NOTSET);
qcam->width = 320;
qcam->height = 240;
@@ -947,6 +1007,11 @@ static struct qcam *qcam_init(struct parport *port)
qcam->mode = -1;
qcam->status = QC_PARAM_CHANGE;
return qcam;
+
+exit:
+ v4l2_ctrl_handler_free(&qcam->hdl);
+ kfree(qcam);
+ return NULL;
}
static int qc_calibrate(struct qcam *q)
--
1.7.10.4
--
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