Again, no complete review, just a couple of remarks
On Tue, 13 Sep 2011, Scott Jiang wrote:
> this is a v4l2 bridge driver for Blackfin video capture device,
> support ppi interface
>
> Signed-off-by: Scott Jiang <scott.jiang.li...@gmail.com>
> ---
[snip]
> diff --git a/drivers/media/video/blackfin/bfin_capture.c
> b/drivers/media/video/blackfin/bfin_capture.c
> new file mode 100644
> index 0000000..24f89f2
> --- /dev/null
> +++ b/drivers/media/video/blackfin/bfin_capture.c
> @@ -0,0 +1,1099 @@
> +/*
> + * Analog Devices video capture driver
> + *
> + * Copyright (c) 2011 Analog Devices Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
> + */
> +
> +
> +#include <linux/kernel.h>
> +#include <linux/init.h>
> +#include <linux/module.h>
> +#include <linux/io.h>
> +#include <linux/delay.h>
> +#include <linux/errno.h>
> +#include <linux/fs.h>
> +#include <linux/interrupt.h>
> +#include <linux/completion.h>
> +#include <linux/mm.h>
> +#include <linux/moduleparam.h>
> +#include <linux/time.h>
> +#include <linux/version.h>
> +#include <linux/device.h>
> +#include <linux/platform_device.h>
> +#include <linux/clk.h>
> +#include <linux/sched.h>
> +#include <linux/slab.h>
> +
> +#include <media/v4l2-common.h>
> +#include <media/v4l2-ioctl.h>
> +#include <media/v4l2-device.h>
> +#include <media/videobuf2-dma-contig.h>
> +#include <media/v4l2-chip-ident.h>
> +
> +#include <asm/dma.h>
> +
> +#include <media/blackfin/bfin_capture.h>
Alphabetic order of headers is preferred. Also holds for other your patches.
> +
> +#define CAPTURE_DRV_NAME "bfin_capture"
> +#define BCAP_MIN_NUM_BUF 2
> +
> +struct bcap_format {
> + u8 *desc;
> + u32 pixelformat;
> + enum v4l2_mbus_pixelcode mbus_code;
> + int bpp; /* bytes per pixel */
Don't you think you might have to process 12 bpp formats at some point,
like YUV 4:2:0, or NV12? Maybe better calculate in bits from the beginning?
> +};
> +
> +struct bcap_buffer {
> + struct vb2_buffer vb;
> + struct list_head list;
> +};
> +
> +struct bcap_device {
> + /* capture device instance */
> + struct v4l2_device v4l2_dev;
> + /* device node data */
> + struct video_device *video_dev;
> + /* sub device instance */
> + struct v4l2_subdev *sd;
> + /* caputre config */
> + struct bfin_capture_config *cfg;
> + /* ppi interface */
> + struct ppi_if *ppi;
> + /* current input */
> + unsigned int cur_input;
> + /* current selected standard */
> + v4l2_std_id std;
> + /* used to store pixel format */
> + struct v4l2_pix_format fmt;
> + /* bytes per pixel*/
> + int bpp;
> + /* pointing to current video buffer */
> + struct bcap_buffer *cur_frm;
> + /* pointing to next video buffer */
> + struct bcap_buffer *next_frm;
> + /* buffer queue used in videobuf2 */
> + struct vb2_queue buffer_queue;
> + /* allocator-specific contexts for each plane */
> + struct vb2_alloc_ctx *alloc_ctx;
> + /* queue of filled frames */
> + struct list_head dma_queue;
> + /* used in videobuf2 callback */
> + spinlock_t lock;
> + /* used to access capture device */
> + struct mutex mutex;
> + /* used to wait ppi to complete one transfer */
> + struct completion comp;
> + /* number of users performing IO */
> + u32 io_usrs;
Does it really have to be fixed 32 bits? Seems a plane simple int would do
just fine.
> + /* number of open instances of the device */
> + u32 usrs;
ditto
> + /* indicate whether streaming has started */
> + u8 started;
bool?
> +};
> +
> +struct bcap_fh {
> + struct v4l2_fh fh;
> + struct bcap_device *bcap_dev;
> + /* indicates whether this file handle is doing IO */
> + u8 io_allowed;
bool
[snip]
> +static irqreturn_t bcap_isr(int irq, void *dev_id)
> +{
> + struct ppi_if *ppi = dev_id;
> + struct bcap_device *bcap_dev = ppi->priv;
> + struct timeval timevalue;
> + struct vb2_buffer *vb = &bcap_dev->cur_frm->vb;
> + dma_addr_t *addr;
> +
> + spin_lock(&bcap_dev->lock);
> +
> + if (bcap_dev->cur_frm != bcap_dev->next_frm) {
> + do_gettimeofday(&timevalue);
> + vb->v4l2_buf.timestamp = timevalue;
> + vb2_buffer_done(vb, VB2_BUF_STATE_DONE);
> + bcap_dev->cur_frm = bcap_dev->next_frm;
> + }
> +
> + ppi->ops->stop(ppi);
> +
> + if (!bcap_dev->started)
> + complete(&bcap_dev->comp);
> + else {
> + if (!list_empty(&bcap_dev->dma_queue)) {
> + bcap_dev->next_frm =
> list_entry(bcap_dev->dma_queue.next,
> + struct bcap_buffer, list);
> + list_del(&bcap_dev->next_frm->list);
> + addr = vb2_plane_cookie(&bcap_dev->next_frm->vb, 0);
I think, the direct use of vb2_plane_cookie() is discouraged.
vb2_dma_contig_plane_dma_addr() should work for you.
> + ppi->ops->update_addr(ppi, (unsigned long)(*addr));
> + }
> + ppi->ops->start(ppi);
> + }
> +
> + spin_unlock(&bcap_dev->lock);
> +
> + return IRQ_HANDLED;
> +}
[snip]
> +static int bcap_try_format(struct bcap_device *bcap,
> + struct v4l2_pix_format *pixfmt,
> + enum v4l2_mbus_pixelcode *mbus_code,
> + int *bpp)
> +{
> + const struct bcap_format *fmt;
> + struct v4l2_mbus_framefmt mbus_fmt;
> + int ret, i;
> +
> + for (i = 0; i < BCAP_MAX_FMTS; i++) {
> + if ((pixfmt->pixelformat == bcap_formats[i].pixelformat)) {
> + fmt = &bcap_formats[i];
> + if (mbus_code)
> + *mbus_code = fmt->mbus_code;
> + if (bpp)
> + *bpp = fmt->bpp;
> + v4l2_fill_mbus_format(&mbus_fmt, pixfmt,
> + fmt->mbus_code);
> + ret = v4l2_subdev_call(bcap->sd, video,
> + try_mbus_fmt, &mbus_fmt);
> + if (ret < 0)
> + return ret;
> + v4l2_fill_pix_format(pixfmt, &mbus_fmt);
> + pixfmt->bytesperline = pixfmt->width * fmt->bpp;
> + pixfmt->sizeimage = pixfmt->bytesperline
> + * pixfmt->height;
> + return 0;
> + }
> + }
> + return -EINVAL;
> +}
> +
> +static int bcap_enum_fmt_vid_cap(struct file *file, void *priv,
> + struct v4l2_fmtdesc *fmt)
> +{
> + struct bcap_device *bcap_dev = video_drvdata(file);
> + enum v4l2_mbus_pixelcode mbus_code;
> + u32 index = fmt->index;
> + int ret, i;
> +
> + ret = v4l2_subdev_call(bcap_dev->sd, video,
> + enum_mbus_fmt, index, &mbus_code);
> + if (ret < 0)
> + return ret;
> +
> + for (i = 0; i < BCAP_MAX_FMTS; i++) {
> + if (mbus_code == bcap_formats[i].mbus_code) {
> + fmt->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
> + strlcpy(fmt->description,
> + bcap_formats[index].desc,
> + sizeof(fmt->description));
> + fmt->pixelformat = bcap_formats[index].pixelformat;
> + return 0;
> + }
> + }
> + v4l2_err(&bcap_dev->v4l2_dev,
> + "subdev fmt is not supported by bcap\n");
> + return -EINVAL;
> +}
> +
> +static int bcap_try_fmt_vid_cap(struct file *file, void *priv,
> + struct v4l2_format *fmt)
> +{
> + struct bcap_device *bcap_dev = video_drvdata(file);
> + struct v4l2_pix_format *pixfmt = &fmt->fmt.pix;
> +
> + if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
> + return -EINVAL;
> +
> + return bcap_try_format(bcap_dev, pixfmt, NULL, NULL);
> +}
> +
> +static int bcap_g_fmt_vid_cap(struct file *file, void *priv,
> + struct v4l2_format *fmt)
> +{
> + struct bcap_device *bcap_dev = video_drvdata(file);
> + struct v4l2_mbus_framefmt mbus_fmt;
> + const struct bcap_format *bcap_fmt;
> + struct v4l2_pix_format *pixfmt = &fmt->fmt.pix;
> + int ret, i;
> +
> + if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
> + return -EINVAL;
> +
> + ret = v4l2_subdev_call(bcap_dev->sd, video,
> + g_mbus_fmt, &mbus_fmt);
> + if (ret < 0)
> + return ret;
> +
> + for (i = 0; i < BCAP_MAX_FMTS; i++) {
> + if (mbus_fmt.code == bcap_formats[i].mbus_code) {
> + bcap_fmt = &bcap_formats[i];
> + v4l2_fill_pix_format(pixfmt, &mbus_fmt);
> + pixfmt->bytesperline = pixfmt->width * bcap_fmt->bpp;
> + pixfmt->sizeimage = pixfmt->bytesperline
> + * pixfmt->height;
It seems to me, you're forgetting to fill in ->pixelformat?
Thanks
Guennadi
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/
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