On Mon, 19 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>
Ok, I know, coming up with new comments to old code in a patch is bad,
sorry about that... But, I think, Hans has requested some changes too, so,
you anyway will be doing a v3.
> ---
> drivers/media/video/Kconfig | 2 +
> drivers/media/video/Makefile | 2 +
> drivers/media/video/blackfin/Kconfig | 10 +
> drivers/media/video/blackfin/Makefile | 2 +
> drivers/media/video/blackfin/bfin_capture.c | 1114
> +++++++++++++++++++++++++++
> drivers/media/video/blackfin/ppi.c | 201 +++++
> include/media/blackfin/bfin_capture.h | 33 +
> include/media/blackfin/ppi.h | 63 ++
> 8 files changed, 1427 insertions(+), 0 deletions(-)
> create mode 100644 drivers/media/video/blackfin/Kconfig
> create mode 100644 drivers/media/video/blackfin/Makefile
> create mode 100644 drivers/media/video/blackfin/bfin_capture.c
> create mode 100644 drivers/media/video/blackfin/ppi.c
> create mode 100644 include/media/blackfin/bfin_capture.h
> create mode 100644 include/media/blackfin/ppi.h
>
> diff --git a/drivers/media/video/Kconfig b/drivers/media/video/Kconfig
> index 1c03abf..52cd491 100644
> --- a/drivers/media/video/Kconfig
> +++ b/drivers/media/video/Kconfig
> @@ -602,6 +602,8 @@ source "drivers/media/video/davinci/Kconfig"
>
> source "drivers/media/video/omap/Kconfig"
>
> +source "drivers/media/video/blackfin/Kconfig"
> +
> source "drivers/media/video/bt8xx/Kconfig"
>
> config VIDEO_PMS
> diff --git a/drivers/media/video/Makefile b/drivers/media/video/Makefile
> index 03b55ed..227a700 100644
> --- a/drivers/media/video/Makefile
> +++ b/drivers/media/video/Makefile
> @@ -177,6 +177,8 @@ obj-$(CONFIG_VIDEO_SAMSUNG_S5P_FIMC) += s5p-fimc/
> obj-$(CONFIG_VIDEO_SAMSUNG_S5P_MFC) += s5p-mfc/
> obj-$(CONFIG_VIDEO_SAMSUNG_S5P_TV) += s5p-tv/
>
> +obj-$(CONFIG_BLACKFIN) += blackfin/
Please, use TABs
> +
> obj-$(CONFIG_ARCH_DAVINCI) += davinci/
>
> obj-$(CONFIG_VIDEO_SH_VOU) += sh_vou.o
> diff --git a/drivers/media/video/blackfin/Kconfig
> b/drivers/media/video/blackfin/Kconfig
> new file mode 100644
> index 0000000..ecd5323
> --- /dev/null
> +++ b/drivers/media/video/blackfin/Kconfig
> @@ -0,0 +1,10 @@
> +config VIDEO_BLACKFIN_CAPTURE
> + tristate "Blackfin Video Capture Driver"
> + depends on VIDEO_V4L2 && BLACKFIN && I2C
> + select VIDEOBUF2_DMA_CONTIG
> + help
> + V4L2 bridge driver for Blackfin video capture device.
> + Choose PPI or EPPI as its interface.
> +
> + To compile this driver as a module, choose M here: the
> + module will be called bfin_video_capture.
> diff --git a/drivers/media/video/blackfin/Makefile
> b/drivers/media/video/blackfin/Makefile
> new file mode 100644
> index 0000000..aa3a0a2
> --- /dev/null
> +++ b/drivers/media/video/blackfin/Makefile
> @@ -0,0 +1,2 @@
> +bfin_video_capture-objs := bfin_capture.o ppi.o
> +obj-$(CONFIG_VIDEO_BLACKFIN_CAPTURE) += bfin_video_capture.o
> diff --git a/drivers/media/video/blackfin/bfin_capture.c
> b/drivers/media/video/blackfin/bfin_capture.c
> new file mode 100644
> index 0000000..30ed8bb
> --- /dev/null
> +++ b/drivers/media/video/blackfin/bfin_capture.c
> @@ -0,0 +1,1114 @@
> +/*
> + * 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/completion.h>
> +#include <linux/delay.h>
> +#include <linux/errno.h>
> +#include <linux/fs.h>
> +#include <linux/i2c.h>
> +#include <linux/init.h>
> +#include <linux/interrupt.h>
> +#include <linux/io.h>
> +#include <linux/mm.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/slab.h>
> +#include <linux/time.h>
> +#include <linux/types.h>
> +
> +#include <media/v4l2-chip-ident.h>
> +#include <media/v4l2-common.h>
> +#include <media/v4l2-device.h>
> +#include <media/v4l2-ioctl.h>
> +#include <media/videobuf2-dma-contig.h>
> +
> +#include <asm/dma.h>
> +
> +#include <media/blackfin/bfin_capture.h>
> +
> +#define CAPTURE_DRV_NAME "bfin_capture"
> +#define BCAP_MIN_NUM_BUF 2
> +
> +struct bcap_format {
> + u8 *desc;
No need for "u8," use "char" instead - you use it for strings.
> + u32 pixelformat;
> + enum v4l2_mbus_pixelcode mbus_code;
> + int bpp; /* bits per pixel */
> +};
> +
> +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;
> + /* capture 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;
> + /* bits 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 */
> + unsigned int io_usrs;
> + /* number of open instances of the device */
> + unsigned int usrs;
> + /* indicate whether streaming has started */
> + bool started;
> +};
> +
> +struct bcap_fh {
> + struct v4l2_fh fh;
> + struct bcap_device *bcap_dev;
> + /* indicates whether this file handle is doing IO */
> + bool io_allowed;
> +};
> +
> +static const struct bcap_format bcap_formats[] = {
> + {
> + .desc = "YCbCr 4:2:2 Interleaved UYVY",
> + .pixelformat = V4L2_PIX_FMT_UYVY,
> + .mbus_code = V4L2_MBUS_FMT_UYVY8_2X8,
> + .bpp = 16,
> + },
> + {
> + .desc = "YCbCr 4:2:2 Interleaved YUYV",
> + .pixelformat = V4L2_PIX_FMT_YUYV,
> + .mbus_code = V4L2_MBUS_FMT_YUYV8_2X8,
> + .bpp = 16,
> + },
> + {
> + .desc = "RGB 565",
> + .pixelformat = V4L2_PIX_FMT_RGB565,
> + .mbus_code = V4L2_MBUS_FMT_RGB565_2X8_LE,
> + .bpp = 16,
> + },
> + {
> + .desc = "RGB 444",
> + .pixelformat = V4L2_PIX_FMT_RGB444,
> + .mbus_code = V4L2_MBUS_FMT_RGB444_2X8_PADHI_LE,
> + .bpp = 16,
> + },
> +
> +};
> +#define BCAP_MAX_FMTS ARRAY_SIZE(bcap_formats)
> +
> +static irqreturn_t bcap_isr(int irq, void *dev_id);
> +
> +static struct bcap_buffer *to_bcap_vb(struct vb2_buffer *vb)
> +{
> + return container_of(vb, struct bcap_buffer, vb);
> +}
> +
> +static int bcap_open(struct file *file)
> +{
> + struct bcap_device *bcap_dev = video_drvdata(file);
> + struct video_device *vfd = bcap_dev->video_dev;
> + struct v4l2_mbus_framefmt mbus_fmt;
> + struct v4l2_pix_format *pixfmt = &bcap_dev->fmt;
> + const struct bcap_format *bcap_fmt;
> + struct bcap_fh *bcap_fh;
> + int ret, i;
> +
> + if (!bcap_dev->sd) {
> + v4l2_err(&bcap_dev->v4l2_dev, "No sub device registered\n");
> + return -ENODEV;
> + }
> +
> + /* if first open, query format of subdevice as default format */
> + if (!bcap_dev->usrs) {
> + 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)
> + continue;
> + bcap_fmt = &bcap_formats[i];
> + v4l2_fill_pix_format(pixfmt, &mbus_fmt);
> + pixfmt->pixelformat = bcap_fmt->pixelformat;
> + pixfmt->bytesperline = pixfmt->width * bcap_fmt->bpp /
> 8;
> + pixfmt->sizeimage = pixfmt->bytesperline *
> pixfmt->height;
> + break;
> + }
> + if (i == BCAP_MAX_FMTS) {
> + v4l2_err(&bcap_dev->v4l2_dev,
> + "subdev fmt is not supported by
> bcap\n");
> + return -EINVAL;
> + }
Now, this looks ugly to me. Maybe this would be better:
for (i = 0; i < BCAP_MAX_FMTS; i++)
if (mbus_fmt.code == bcap_formats[i].mbus_code)
break;
if (i == BCAP_MAX_FMTS) {
v4l2_err(&bcap_dev->v4l2_dev,
"subdev fmt is not supported by
bcap\n");
return -EINVAL;
}
bcap_fmt = &bcap_formats[i];
v4l2_fill_pix_format(pixfmt, &mbus_fmt);
...
> + }
> +
> + bcap_fh = kzalloc(sizeof(*bcap_fh), GFP_KERNEL);
> + if (!bcap_fh) {
> + v4l2_err(&bcap_dev->v4l2_dev,
> + "unable to allocate memory for file handle object\n");
> + return -ENOMEM;
> + }
> +
> + v4l2_fh_init(&bcap_fh->fh, vfd);
> +
> + /* store pointer to v4l2_fh in private_data member of file */
> + file->private_data = &bcap_fh->fh;
> + v4l2_fh_add(&bcap_fh->fh);
> + bcap_fh->bcap_dev = bcap_dev;
> + bcap_dev->usrs++;
> + bcap_fh->io_allowed = false;
> + return 0;
> +}
> +
> +static int bcap_release(struct file *file)
> +{
> + struct bcap_device *bcap_dev = video_drvdata(file);
> + struct v4l2_fh *fh = file->private_data;
> + struct bcap_fh *bcap_fh = container_of(fh, struct bcap_fh, fh);
> +
> + /* if this instance is doing IO */
> + if (bcap_fh->io_allowed) {
> + vb2_queue_release(&bcap_dev->buffer_queue);
> + bcap_dev->io_usrs = 0;
> + }
> +
> + bcap_dev->usrs--;
> + file->private_data = NULL;
> + v4l2_fh_del(&bcap_fh->fh);
> + v4l2_fh_exit(&bcap_fh->fh);
> + kfree(bcap_fh);
> + return 0;
> +}
> +
> +static int bcap_mmap(struct file *file, struct vm_area_struct *vma)
> +{
> + struct bcap_device *bcap_dev = video_drvdata(file);
> +
> + return vb2_mmap(&bcap_dev->buffer_queue, vma);
> +}
> +
> +#ifndef CONFIG_MMU
> +static unsigned long bcap_get_unmapped_area(struct file *file,
> + unsigned long addr,
> + unsigned long len,
> + unsigned long pgoff,
> + unsigned long flags)
> +{
> + struct bcap_device *bcap_dev = video_drvdata(file);
> +
> + return vb2_get_unmapped_area(&bcap_dev->buffer_queue,
> + addr,
> + len,
> + pgoff,
> + flags);
> +}
> +#endif
> +
> +static unsigned int bcap_poll(struct file *file, poll_table *wait)
> +{
> + struct bcap_device *bcap_dev = video_drvdata(file);
> +
> + if (bcap_dev->started)
> + return vb2_poll(&bcap_dev->buffer_queue, file, wait);
> + return 0;
> +}
> +
> +static int bcap_queue_setup(struct vb2_queue *vq, unsigned int *nbuffers,
> + unsigned int *nplanes, unsigned long sizes[],
> + void *alloc_ctxs[])
> +{
> + struct bcap_device *bcap_dev = vb2_get_drv_priv(vq);
> +
> + if (*nbuffers < BCAP_MIN_NUM_BUF)
> + *nbuffers = BCAP_MIN_NUM_BUF;
> +
> + *nplanes = 1;
> + sizes[0] = bcap_dev->fmt.sizeimage;
> + alloc_ctxs[0] = bcap_dev->alloc_ctx;
> +
> + return 0;
> +}
> +
> +static int bcap_buffer_init(struct vb2_buffer *vb)
> +{
> + struct bcap_buffer *buf = to_bcap_vb(vb);
> +
> + INIT_LIST_HEAD(&buf->list);
> + return 0;
> +}
> +
> +static int bcap_buffer_prepare(struct vb2_buffer *vb)
> +{
> + struct bcap_device *bcap_dev = vb2_get_drv_priv(vb->vb2_queue);
> + struct bcap_buffer *buf = to_bcap_vb(vb);
> + unsigned long size;
> +
> + size = bcap_dev->fmt.sizeimage;
> + if (vb2_plane_size(vb, 0) < size) {
> + v4l2_err(&bcap_dev->v4l2_dev, "buffer too small (%lu < %lu)\n",
> + vb2_plane_size(vb, 0), size);
> + return -EINVAL;
> + }
> + vb2_set_plane_payload(&buf->vb, 0, size);
> +
> + return 0;
> +}
> +
> +static void bcap_buffer_queue(struct vb2_buffer *vb)
> +{
> + struct bcap_device *bcap_dev = vb2_get_drv_priv(vb->vb2_queue);
> + struct bcap_buffer *buf = to_bcap_vb(vb);
> + unsigned long flags = 0;
No need to initialise, same everywhere below.
> +
> + spin_lock_irqsave(&bcap_dev->lock, flags);
> + list_add_tail(&buf->list, &bcap_dev->dma_queue);
> + spin_unlock_irqrestore(&bcap_dev->lock, flags);
> +}
> +
> +static void bcap_buffer_cleanup(struct vb2_buffer *vb)
> +{
> + struct bcap_device *bcap_dev = vb2_get_drv_priv(vb->vb2_queue);
> + struct bcap_buffer *buf = to_bcap_vb(vb);
> + unsigned long flags = 0;
> +
> + spin_lock_irqsave(&bcap_dev->lock, flags);
> + list_del_init(&buf->list);
> + spin_unlock_irqrestore(&bcap_dev->lock, flags);
> +}
> +
> +static void bcap_lock(struct vb2_queue *vq)
> +{
> + struct bcap_device *bcap_dev = vb2_get_drv_priv(vq);
> + mutex_lock(&bcap_dev->mutex);
> +}
> +
> +static void bcap_unlock(struct vb2_queue *vq)
> +{
> + struct bcap_device *bcap_dev = vb2_get_drv_priv(vq);
> + mutex_unlock(&bcap_dev->mutex);
> +}
> +
> +static int bcap_start_streaming(struct vb2_queue *vq)
> +{
> + struct bcap_device *bcap_dev = vb2_get_drv_priv(vq);
> + struct ppi_if *ppi = bcap_dev->ppi;
> + struct ppi_params params;
> + int ret;
> +
> + /* enable streamon on the sub device */
> + ret = v4l2_subdev_call(bcap_dev->sd, video, s_stream, 1);
> + if (ret && (ret != -ENOIOCTLCMD)) {
> + v4l2_err(&bcap_dev->v4l2_dev, "stream on failed in subdev\n");
> + return ret;
> + }
> +
> + /* attach ppi DMA irq handler */
> + ret = ppi->ops->attach_irq(ppi, bcap_isr);
> + if (ret < 0) {
> + v4l2_err(&bcap_dev->v4l2_dev,
> + "Error in attaching interrupt handler\n");
> + return -EFAULT;
> + }
> +
> + /* set ppi params */
> + params.width = bcap_dev->fmt.width;
> + params.height = bcap_dev->fmt.height;
> + params.bpp = bcap_dev->bpp;
> + params.ppi_control = bcap_dev->cfg->ppi_control;
> + ret = ppi->ops->set_params(ppi, ¶ms);
Why are you using these ppi operations at all? why not just call functions
directly? Are you expecting a different implementation in the future?
> + if (ret < 0) {
> + v4l2_err(&bcap_dev->v4l2_dev,
> + "Error in setting ppi params\n");
> + ppi->ops->detach_irq(ppi);
> + return -EINVAL;
return ret?
> + }
> +
> + INIT_COMPLETION(bcap_dev->comp);
> + return 0;
> +}
> +
> +static int bcap_stop_streaming(struct vb2_queue *vq)
> +{
> + struct bcap_device *bcap_dev = vb2_get_drv_priv(vq);
> + struct ppi_if *ppi = bcap_dev->ppi;
> + int ret;
> +
> + if (!bcap_dev->started)
> + return 0;
> +
> + bcap_dev->started = false;
> + wait_for_completion(&bcap_dev->comp);
> + ppi->ops->stop(ppi);
> + ppi->ops->detach_irq(ppi);
> + ret = v4l2_subdev_call(bcap_dev->sd, video, s_stream, 0);
> + if (ret && (ret != -ENOIOCTLCMD))
> + v4l2_err(&bcap_dev->v4l2_dev,
> + "stream off failed in subdev\n");
> +
> + /* release all active buffers */
> + while (!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);
> + vb2_buffer_done(&bcap_dev->next_frm->vb, VB2_BUF_STATE_ERROR);
> + }
> + return 0;
> +}
> +
> +static struct vb2_ops bcap_video_qops = {
> + .queue_setup = bcap_queue_setup,
> + .buf_init = bcap_buffer_init,
> + .buf_prepare = bcap_buffer_prepare,
> + .buf_cleanup = bcap_buffer_cleanup,
> + .buf_queue = bcap_buffer_queue,
> + .wait_prepare = bcap_unlock,
> + .wait_finish = bcap_lock,
> + .start_streaming = bcap_start_streaming,
> + .stop_streaming = bcap_stop_streaming,
> +};
> +
> +static int bcap_reqbufs(struct file *file, void *priv,
> + struct v4l2_requestbuffers *req_buf)
> +{
> + struct bcap_device *bcap_dev = video_drvdata(file);
> + struct v4l2_fh *fh = file->private_data;
> + struct bcap_fh *bcap_fh = container_of(fh, struct bcap_fh, fh);
> +
> + if (bcap_dev->io_usrs != 0) {
> + v4l2_err(&bcap_dev->v4l2_dev, "Only one IO user allowed\n");
> + return -EBUSY;
> + }
> +
> + bcap_fh->io_allowed = true;
> + bcap_dev->io_usrs = 1;
> +
> + return vb2_reqbufs(&bcap_dev->buffer_queue, req_buf);
> +}
> +
> +static int bcap_querybuf(struct file *file, void *priv,
> + struct v4l2_buffer *buf)
> +{
> + struct bcap_device *bcap_dev = video_drvdata(file);
> +
> + return vb2_querybuf(&bcap_dev->buffer_queue, buf);
> +}
> +
> +static int bcap_qbuf(struct file *file, void *priv,
> + struct v4l2_buffer *buf)
> +{
> + struct bcap_device *bcap_dev = video_drvdata(file);
> + struct v4l2_fh *fh = file->private_data;
> + struct bcap_fh *bcap_fh = container_of(fh, struct bcap_fh, fh);
> +
> + if (!bcap_fh->io_allowed)
> + return -EACCES;
> +
> + return vb2_qbuf(&bcap_dev->buffer_queue, buf);
> +}
> +
> +static int bcap_dqbuf(struct file *file, void *priv,
> + struct v4l2_buffer *buf)
> +{
> + struct bcap_device *bcap_dev = video_drvdata(file);
> + struct v4l2_fh *fh = file->private_data;
> + struct bcap_fh *bcap_fh = container_of(fh, struct bcap_fh, fh);
> +
> + if (!bcap_fh->io_allowed)
> + return -EACCES;
> +
> + return vb2_dqbuf(&bcap_dev->buffer_queue,
> + buf, file->f_flags & O_NONBLOCK);
> +}
> +
> +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_dma_contig_plane_paddr(&bcap_dev->next_frm->vb, 0);
vb2_dma_contig_plane_dma_addr(), you might want to rebase your work on top
of
git://linuxtv.org/media_tree.git / staging/for_v3.2
> + ppi->ops->update_addr(ppi, (unsigned long)addr);
> + }
> + ppi->ops->start(ppi);
> + }
> +
> + spin_unlock(&bcap_dev->lock);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static int bcap_streamon(struct file *file, void *priv,
> + enum v4l2_buf_type buf_type)
> +{
> + struct bcap_device *bcap_dev = video_drvdata(file);
> + struct bcap_fh *fh = file->private_data;
> + struct ppi_if *ppi = bcap_dev->ppi;
> + dma_addr_t addr;
> + int ret;
> +
> + if (!fh->io_allowed)
> + return -EACCES;
> +
> + if (bcap_dev->started)
> + return -EBUSY;
> +
> + /* call streamon to start streaming in videobuf */
> + ret = vb2_streamon(&bcap_dev->buffer_queue, buf_type);
> + if (ret)
> + return ret;
> +
> + /* if dma queue is empty, return error */
> + if (list_empty(&bcap_dev->dma_queue)) {
> + v4l2_err(&bcap_dev->v4l2_dev, "dma queue is empty\n");
> + ret = -EINVAL;
> + goto err;
> + }
> +
> + /* get the next frame from the dma queue */
> + bcap_dev->next_frm = list_entry(bcap_dev->dma_queue.next,
> + struct bcap_buffer, list);
> + bcap_dev->cur_frm = bcap_dev->next_frm;
> + /* remove buffer from the dma queue */
> + list_del(&bcap_dev->cur_frm->list);
> + addr = vb2_dma_contig_plane_paddr(&bcap_dev->cur_frm->vb, 0);
ditto: ..._dma_addr()
> + /* update DMA address */
> + ppi->ops->update_addr(ppi, (unsigned long)addr);
> + /* enable ppi */
> + ppi->ops->start(ppi);
> + bcap_dev->started = true;
Even if ov2640's .s_stream() operation is a NOP, you still might want to
call it here and in streamoff() below.
> +
> + return 0;
> +err:
> + vb2_streamoff(&bcap_dev->buffer_queue, buf_type);
> + return ret;
> +}
> +
> +static int bcap_streamoff(struct file *file, void *priv,
> + enum v4l2_buf_type buf_type)
> +{
> + struct bcap_device *bcap_dev = video_drvdata(file);
> + struct bcap_fh *fh = file->private_data;
> +
> + if (!fh->io_allowed)
> + return -EACCES;
> +
> + if (!bcap_dev->started)
> + return -EINVAL;
> +
> + return vb2_streamoff(&bcap_dev->buffer_queue, buf_type);
> +}
> +
> +static int bcap_queryctrl(struct file *file, void *priv,
> + struct v4l2_queryctrl *qctrl)
> +{
> + struct bcap_device *bcap_dev = video_drvdata(file);
> +
> + return v4l2_subdev_call(bcap_dev->sd, core, queryctrl, qctrl);
> +}
> +
> +static int bcap_g_ctrl(struct file *file, void *priv,
> + struct v4l2_control *ctrl)
> +{
> + struct bcap_device *bcap_dev = video_drvdata(file);
> +
> + return v4l2_subdev_call(bcap_dev->sd, core, g_ctrl, ctrl);
> +}
> +
> +static int bcap_s_ctrl(struct file *file, void *priv,
> + struct v4l2_control *ctrl)
> +{
> + struct bcap_device *bcap_dev = video_drvdata(file);
> +
> + return v4l2_subdev_call(bcap_dev->sd, core, s_ctrl, ctrl);
> +}
> +
> +static int bcap_querystd(struct file *file, void *priv, v4l2_std_id *std)
> +{
> + struct bcap_device *bcap_dev = video_drvdata(file);
> + int ret;
> +
> + ret = v4l2_subdev_call(bcap_dev->sd, video, querystd, std);
> + return ret;
> +}
> +
> +static int bcap_g_std(struct file *file, void *priv, v4l2_std_id *std)
> +{
> + struct bcap_device *bcap_dev = video_drvdata(file);
> +
> + if (bcap_dev->std) {
> + *std = bcap_dev->std;
> + return 0;
> + } else
> + return -EINVAL;
Either add braces or change to something like
if (!bcap_dev->std)
return -EINVAL;
*std = bcap_dev->std;
return 0;
> +}
> +
> +static int bcap_s_std(struct file *file, void *priv, v4l2_std_id *std)
> +{
> + struct bcap_device *bcap_dev = video_drvdata(file);
> + int ret;
> +
> + /* if streaming is started, return error */
> + if (bcap_dev->started) {
> + v4l2_err(&bcap_dev->v4l2_dev, "Streaming is started\n");
> + return -EBUSY;
> + }
> +
> + ret = v4l2_subdev_call(bcap_dev->sd, core, s_std, *std);
> + if (ret < 0)
> + return ret;
> +
> + bcap_dev->std = *std;
> + return 0;
> +}
> +
> +static int bcap_enum_input(struct file *file, void *priv,
> + struct v4l2_input *input)
> +{
> + struct bcap_device *bcap_dev = video_drvdata(file);
> + struct bfin_capture_config *config = bcap_dev->cfg;
> + int ret;
> + u32 status;
> +
> + if (input->index >= config->num_inputs)
> + return -EINVAL;
> +
> + *input = config->inputs[input->index];
> + /* get input status */
> + ret = v4l2_subdev_call(bcap_dev->sd, video, g_input_status, &status);
> + if (!ret)
> + input->status = status;
> + return 0;
> +}
> +
> +static int bcap_g_input(struct file *file, void *priv, unsigned int *index)
> +{
> + struct bcap_device *bcap_dev = video_drvdata(file);
> +
> + *index = bcap_dev->cur_input;
> + return 0;
> +}
> +
> +static int bcap_s_input(struct file *file, void *priv, unsigned int index)
> +{
> + struct bcap_device *bcap_dev = video_drvdata(file);
> + struct bfin_capture_config *config = bcap_dev->cfg;
> + struct bcap_route *route;
> + int ret;
> +
> + /* if streaming is started, return error */
> + if (bcap_dev->started) {
> + v4l2_err(&bcap_dev->v4l2_dev, "Streaming is started\n");
> + return -EBUSY;
> + }
> +
> + if (index >= config->num_inputs)
> + return -EINVAL;
> +
> + route = &config->routes[index];
> + ret = v4l2_subdev_call(bcap_dev->sd, video, s_routing,
> + route->input, route->output, 0);
> + if ((ret < 0) && (ret != -ENOIOCTLCMD)) {
Superfluous parenthesis
> + v4l2_err(&bcap_dev->v4l2_dev, "Failed to set input\n");
> + return ret;
> + }
> + bcap_dev->cur_input = index;
> + return 0;
> +}
> +
> +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)
> + continue;
IMHO, also here this would look prettier:
for (...)
if (...)
break;
if (i == MAX)
return -EINVAL;
...
return 0;
But in fact .try_fmt() shouldn't fail. I would only consider failing, if
the subdevice failed - then you have no chance. Otherwise just pick up any
format you like, but do not fail.
> + 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 / 8;
> + 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)
> + continue;
ditto - loop formatting
> + 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)
-"-
> + continue;
> + bcap_fmt = &bcap_formats[i];
> + v4l2_fill_pix_format(pixfmt, &mbus_fmt);
> + pixfmt->pixelformat = bcap_fmt->pixelformat;
> + pixfmt->bytesperline = pixfmt->width * bcap_fmt->bpp / 8;
> + pixfmt->sizeimage = pixfmt->bytesperline * pixfmt->height;
> + return 0;
> + }
> + v4l2_err(&bcap_dev->v4l2_dev,
> + "subdev fmt is not supported by bcap\n");
> + return -EINVAL;
g_fmt() should not be failing either, but you're stuck here in case the
subdevice returns an unsupported format. That's why in soc-camera we first
perform some initial format negotiation at probe time - also like Hans has
suggested - then you know at all times, that you have a valid
configuration, or you just fail probing straight away.
> +}
> +
> +static int bcap_s_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;
> + enum v4l2_mbus_pixelcode mbus_code;
> + struct v4l2_pix_format *pixfmt = &fmt->fmt.pix;
> + int ret, bpp;
> +
> + /* if streaming is started, return error */
> + if (bcap_dev->started) {
> + v4l2_err(&bcap_dev->v4l2_dev, "Streaming is started\n");
> + return -EBUSY;
> + }
> +
> + if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
> + return -EINVAL;
> + /* see if format works */
> + ret = bcap_try_format(bcap_dev, pixfmt, &mbus_code, &bpp);
> + if (ret < 0)
> + return ret;
> +
> + v4l2_fill_mbus_format(&mbus_fmt, pixfmt, mbus_code);
> + ret = v4l2_subdev_call(bcap_dev->sd, video, s_mbus_fmt, &mbus_fmt);
> + if (ret < 0)
> + return ret;
the subdevice might have changed geometry and the pixel code - just like
ov2640 does. You, probably, want to double-check the result.
> + bcap_dev->fmt = *pixfmt;
> + bcap_dev->bpp = bpp;
> + return 0;
> +}
> +
> +static int bcap_querycap(struct file *file, void *priv,
> + struct v4l2_capability *cap)
> +{
> + struct bcap_device *bcap_dev = video_drvdata(file);
> +
> + cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
> + strlcpy(cap->driver, CAPTURE_DRV_NAME, sizeof(cap->driver));
> + strlcpy(cap->bus_info, "Blackfin Platform", sizeof(cap->bus_info));
> + strlcpy(cap->card, bcap_dev->cfg->card_name, sizeof(cap->card));
> + return 0;
> +}
> +
> +static int bcap_cropcap(struct file *file, void *priv,
> + struct v4l2_cropcap *crop)
> +{
> + struct bcap_device *bcap_dev = video_drvdata(file);
> +
> + if (crop->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
> + return -EINVAL;
> +
> + return v4l2_subdev_call(bcap_dev->sd, video, cropcap, crop);
> +}
Hm, does it make much sense to support cropcap and not to support g_crop
or s_crop? Not sure what others do in this case, or whether the spec says
anything about it, but if you cannot crop, it would be logical to return
defrect == bounds from cropcap.
> +
> +static int bcap_g_parm(struct file *file, void *fh,
> + struct v4l2_streamparm *a)
> +{
> + struct bcap_device *bcap_dev = video_drvdata(file);
> +
> + if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
> + return -EINVAL;
> + return v4l2_subdev_call(bcap_dev->sd, video, g_parm, a);
> +}
> +
> +static int bcap_s_parm(struct file *file, void *fh,
> + struct v4l2_streamparm *a)
> +{
> + struct bcap_device *bcap_dev = video_drvdata(file);
> +
> + if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
> + return -EINVAL;
> + return v4l2_subdev_call(bcap_dev->sd, video, s_parm, a);
> +}
> +
> +static int bcap_g_chip_ident(struct file *file, void *priv,
> + struct v4l2_dbg_chip_ident *chip)
> +{
> + struct bcap_device *bcap_dev = video_drvdata(file);
> +
> + chip->ident = V4L2_IDENT_NONE;
> + chip->revision = 0;
> + if (chip->match.type != V4L2_CHIP_MATCH_I2C_DRIVER &&
> + chip->match.type != V4L2_CHIP_MATCH_I2C_ADDR)
> + return -EINVAL;
> +
> + return v4l2_subdev_call(bcap_dev->sd, core,
> + g_chip_ident, chip);
> +}
> +
> +#ifdef CONFIG_VIDEO_ADV_DEBUG
> +static int bcap_dbg_g_register(struct file *file, void *priv,
> + struct v4l2_dbg_register *reg)
> +{
> + struct bcap_device *bcap_dev = video_drvdata(file);
> +
> + return v4l2_subdev_call(bcap_dev->sd, core,
> + g_register, reg);
> +}
> +
> +static int bcap_dbg_s_register(struct file *file, void *priv,
> + struct v4l2_dbg_register *reg)
> +{
> + struct bcap_device *bcap_dev = video_drvdata(file);
> +
> + return v4l2_subdev_call(bcap_dev->sd, core,
> + s_register, reg);
> +}
> +#endif
> +
> +static int bcap_log_status(struct file *file, void *priv)
> +{
> + struct bcap_device *bcap_dev = video_drvdata(file);
> + /* status for sub devices */
> + v4l2_device_call_all(&bcap_dev->v4l2_dev, 0, core, log_status);
> + return 0;
> +}
> +
> +static const struct v4l2_ioctl_ops bcap_ioctl_ops = {
> + .vidioc_querycap = bcap_querycap,
> + .vidioc_g_fmt_vid_cap = bcap_g_fmt_vid_cap,
> + .vidioc_enum_fmt_vid_cap = bcap_enum_fmt_vid_cap,
> + .vidioc_s_fmt_vid_cap = bcap_s_fmt_vid_cap,
> + .vidioc_try_fmt_vid_cap = bcap_try_fmt_vid_cap,
> + .vidioc_enum_input = bcap_enum_input,
> + .vidioc_g_input = bcap_g_input,
> + .vidioc_s_input = bcap_s_input,
> + .vidioc_querystd = bcap_querystd,
> + .vidioc_s_std = bcap_s_std,
> + .vidioc_g_std = bcap_g_std,
> + .vidioc_queryctrl = bcap_queryctrl,
> + .vidioc_g_ctrl = bcap_g_ctrl,
> + .vidioc_s_ctrl = bcap_s_ctrl,
> + .vidioc_reqbufs = bcap_reqbufs,
> + .vidioc_querybuf = bcap_querybuf,
> + .vidioc_qbuf = bcap_qbuf,
> + .vidioc_dqbuf = bcap_dqbuf,
> + .vidioc_streamon = bcap_streamon,
> + .vidioc_streamoff = bcap_streamoff,
> + .vidioc_cropcap = bcap_cropcap,
> + .vidioc_g_parm = bcap_g_parm,
> + .vidioc_s_parm = bcap_s_parm,
> + .vidioc_g_chip_ident = bcap_g_chip_ident,
> +#ifdef CONFIG_VIDEO_ADV_DEBUG
> + .vidioc_g_register = bcap_dbg_g_register,
> + .vidioc_s_register = bcap_dbg_s_register,
> +#endif
> + .vidioc_log_status = bcap_log_status,
> +};
> +
> +static struct v4l2_file_operations bcap_fops = {
> + .owner = THIS_MODULE,
> + .open = bcap_open,
> + .release = bcap_release,
> + .unlocked_ioctl = video_ioctl2,
> + .mmap = bcap_mmap,
> +#ifndef CONFIG_MMU
> + .get_unmapped_area = bcap_get_unmapped_area,
> +#endif
> + .poll = bcap_poll
> +};
> +
> +static int __devinit bcap_probe(struct platform_device *pdev)
> +{
> + struct bcap_device *bcap_dev;
> + struct video_device *vfd;
> + struct i2c_adapter *i2c_adap;
> + struct bfin_capture_config *config;
> + struct vb2_queue *q;
> + int ret;
> +
> + config = pdev->dev.platform_data;
> + if (!config) {
> + v4l2_err(pdev->dev.driver, "Unable to get board config\n");
> + return -ENODEV;
> + }
> +
> + bcap_dev = kzalloc(sizeof(*bcap_dev), GFP_KERNEL);
> + if (!bcap_dev) {
> + v4l2_err(pdev->dev.driver, "Unable to alloc bcap_dev\n");
> + return -ENOMEM;
> + }
> +
> + bcap_dev->cfg = config;
> +
> + bcap_dev->ppi = ppi_create_instance(config->ppi_info);
> + if (!bcap_dev->ppi) {
> + v4l2_err(pdev->dev.driver, "Unable to create ppi\n");
> + ret = -ENODEV;
> + goto err_free_dev;
> + }
> + bcap_dev->ppi->priv = bcap_dev;
> +
> + bcap_dev->alloc_ctx = vb2_dma_contig_init_ctx(&pdev->dev);
> + if (IS_ERR(bcap_dev->alloc_ctx)) {
> + ret = PTR_ERR(bcap_dev->alloc_ctx);
> + goto err_free_ppi;
> + }
> +
> + vfd = video_device_alloc();
> + if (!vfd) {
> + ret = -ENOMEM;
> + v4l2_err(pdev->dev.driver, "Unable to alloc video device\n");
> + goto err_cleanup_ctx;
> + }
> +
> + /* initialize field of video device */
> + vfd->release = video_device_release;
> + vfd->fops = &bcap_fops;
> + vfd->ioctl_ops = &bcap_ioctl_ops;
> + vfd->tvnorms = 0;
> + vfd->v4l2_dev = &bcap_dev->v4l2_dev;
> + set_bit(V4L2_FL_USE_FH_PRIO, &vfd->flags);
> + strncpy(vfd->name, CAPTURE_DRV_NAME, sizeof(vfd->name));
> + bcap_dev->video_dev = vfd;
> +
> + ret = v4l2_device_register(&pdev->dev, &bcap_dev->v4l2_dev);
> + if (ret) {
> + v4l2_err(pdev->dev.driver,
> + "Unable to register v4l2 device\n");
> + goto err_release_vdev;
> + }
> + v4l2_info(&bcap_dev->v4l2_dev, "v4l2 device registered\n");
> +
> + spin_lock_init(&bcap_dev->lock);
> + /* initialize queue */
> + q = &bcap_dev->buffer_queue;
> + q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
> + q->io_modes = VB2_MMAP;
> + q->drv_priv = bcap_dev;
> + q->buf_struct_size = sizeof(struct bcap_buffer);
> + q->ops = &bcap_video_qops;
> + q->mem_ops = &vb2_dma_contig_memops;
> +
> + vb2_queue_init(q);
> +
> + mutex_init(&bcap_dev->mutex);
> + init_completion(&bcap_dev->comp);
> +
> + /* init video dma queues */
> + INIT_LIST_HEAD(&bcap_dev->dma_queue);
> +
> + vfd->lock = &bcap_dev->mutex;
> +
> + /* register video device */
> + ret = video_register_device(bcap_dev->video_dev, VFL_TYPE_GRABBER, -1);
> + if (ret) {
> + v4l2_err(&bcap_dev->v4l2_dev,
> + "Unable to register video device\n");
> + goto err_unreg_v4l2;
> + }
> + video_set_drvdata(bcap_dev->video_dev, bcap_dev);
> + v4l2_info(&bcap_dev->v4l2_dev, "video device registered as: %s\n",
> + video_device_node_name(vfd));
> +
> + /* load up the subdevice */
> + i2c_adap = i2c_get_adapter(config->i2c_adapter_id);
> + if (!i2c_adap) {
> + v4l2_err(&bcap_dev->v4l2_dev,
> + "Unable to find i2c adapter\n");
> + goto err_unreg_vdev;
> +
> + }
> + bcap_dev->sd = v4l2_i2c_new_subdev_board(&bcap_dev->v4l2_dev,
> + i2c_adap,
> + &config->board_info,
> + NULL);
> + if (bcap_dev->sd) {
> + int i;
> + /* update tvnorms from the sub devices */
> + for (i = 0; i < config->num_inputs; i++)
> + vfd->tvnorms |= config->inputs[i].std;
> + /* set default std */
> + bcap_dev->std = vfd->tvnorms;
> + } else {
> + v4l2_err(&bcap_dev->v4l2_dev,
> + "Unable to register sub device\n");
> + goto err_unreg_vdev;
> + }
> + v4l2_info(&bcap_dev->v4l2_dev, "v4l2 sub device registered\n");
> + return 0;
> +err_unreg_vdev:
> + video_unregister_device(bcap_dev->video_dev);
> +err_unreg_v4l2:
> + v4l2_device_unregister(&bcap_dev->v4l2_dev);
> +err_release_vdev:
> + if (!video_is_registered(bcap_dev->video_dev))
> + video_device_release(bcap_dev->video_dev);
this is strange: if you come here from err_unreg_vdev,
video_unregister_device() will be called, then the device's release
method, i.e., video_device_release(), right? That will call
kfree(bcap_dev->video_dev). Then you arrive here and try to dereference a
freed pointer... Or am I missing something?If I'm right, setting video_dev
= NULL just above err_unreg_v4l2 shall avoid this problem.
> +err_cleanup_ctx:
> + vb2_dma_contig_cleanup_ctx(bcap_dev->alloc_ctx);
> +err_free_ppi:
> + ppi_delete_instance(bcap_dev->ppi);
> +err_free_dev:
> + kfree(bcap_dev);
> + return ret;
> +}
> +
> +static int __devexit bcap_remove(struct platform_device *pdev)
> +{
> + struct v4l2_device *v4l2_dev = platform_get_drvdata(pdev);
> + struct bcap_device *bcap_dev = container_of(v4l2_dev,
> + struct bcap_device, v4l2_dev);
> +
> + video_unregister_device(bcap_dev->video_dev);
> + v4l2_device_unregister(v4l2_dev);
> + vb2_dma_contig_cleanup_ctx(bcap_dev->alloc_ctx);
> + ppi_delete_instance(bcap_dev->ppi);
> + kfree(bcap_dev);
> + return 0;
> +}
> +
> +static struct platform_driver bcap_driver = {
> + .driver = {
> + .name = CAPTURE_DRV_NAME,
> + .owner = THIS_MODULE,
bad alignment
> + },
> + .probe = bcap_probe,
> + .remove = __devexit_p(bcap_remove),
> +};
> +
> +static __init int bcap_init(void)
> +{
> + return platform_driver_register(&bcap_driver);
> +}
> +
> +static __exit void bcap_exit(void)
> +{
> + platform_driver_unregister(&bcap_driver);
> +}
> +
> +module_init(bcap_init);
> +module_exit(bcap_exit);
> +
> +MODULE_DESCRIPTION("Analog Devices blackfin video capture driver");
> +MODULE_AUTHOR("Scott Jiang <scott.jiang.li...@gmail.com>");
> +MODULE_LICENSE("GPL v2");
> diff --git a/drivers/media/video/blackfin/ppi.c
> b/drivers/media/video/blackfin/ppi.c
> new file mode 100644
> index 0000000..3b5f43e
> --- /dev/null
> +++ b/drivers/media/video/blackfin/ppi.c
> @@ -0,0 +1,201 @@
> +/*
> + * ppi.c Analog Devices Parallel Peripheral Interface driver
So, you expect to have other interfaces (serial or something), which would
be implementing the same operations and attach to your bfin_capture.c
instead of ppi.c?
> + *
> + * 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/slab.h>
> +
> +#include <asm/bfin_ppi.h>
> +#include <asm/blackfin.h>
> +#include <asm/cacheflush.h>
> +#include <asm/dma.h>
> +#include <asm/portmux.h>
> +
> +#include <media/blackfin/ppi.h>
> +
> +static int ppi_attach_irq(struct ppi_if *ppi, irq_handler_t handler);
> +static void ppi_detach_irq(struct ppi_if *ppi);
> +static int ppi_start(struct ppi_if *ppi);
> +static int ppi_stop(struct ppi_if *ppi);
> +static int ppi_set_params(struct ppi_if *ppi, struct ppi_params *params);
> +static void ppi_update_addr(struct ppi_if *ppi, unsigned long addr);
> +
> +static const struct ppi_ops ppi_ops = {
> + .attach_irq = ppi_attach_irq,
> + .detach_irq = ppi_detach_irq,
> + .start = ppi_start,
> + .stop = ppi_stop,
> + .set_params = ppi_set_params,
> + .update_addr = ppi_update_addr,
> +};
> +
> +static irqreturn_t ppi_irq_err(int irq, void *dev_id)
> +{
> + struct ppi_if *ppi = dev_id;
> + const struct ppi_info *info = ppi->info;
> + unsigned short status;
> +
> + if (!strcmp(info->name, "ppi")) {
> + struct bfin_ppi_regs __iomem *reg =
> + (struct bfin_ppi_regs __iomem *)info->base;
> + status = bfin_read16(reg->status);
> + if (printk_ratelimit())
> + pr_info("%s: status = 0x%x\n", __func__, status);
You don't want this in the mainline version...
> + bfin_write16(®->status, 0xff);
> + }
> +
> + return IRQ_HANDLED;
> +}
> +
> +static int ppi_attach_irq(struct ppi_if *ppi, irq_handler_t handler)
> +{
> + const struct ppi_info *info = ppi->info;
> +
> + if (request_dma(info->dma_ch, "PPI_DMA") < 0) {
> + pr_err("Unable to allocate DMA channel for PPI\n");
> + return -EBUSY;
Why don't you propagate return code from request_dma()?
> + }
> + set_dma_callback(info->dma_ch, handler, ppi);
> +
> + if (request_irq(info->irq_err, ppi_irq_err, IRQF_DISABLED,
AFAIK, IRQF_DISABLED is gone from the kernel.
> + "PPI ERROR", ppi)) {
> + pr_err("Unable to allocate IRQ for PPI\n");
> + free_dma(info->dma_ch);
> + return -EBUSY;
ditto ret = request_irq()...
> + }
> + return 0;
> +}
> +
> +static void ppi_detach_irq(struct ppi_if *ppi)
> +{
> + const struct ppi_info *info = ppi->info;
> +
> + free_irq(info->irq_err, ppi);
> + free_dma(info->dma_ch);
> +}
> +
> +static int ppi_start(struct ppi_if *ppi)
> +{
> + const struct ppi_info *info = ppi->info;
> +
> + /* enable DMA */
> + enable_dma(info->dma_ch);
> +
> + /* enable PPI */
> + ppi->ppi_control |= PORT_EN;
> + if (!strcmp(info->name, "ppi")) {
> + struct bfin_ppi_regs __iomem *reg =
> + (struct bfin_ppi_regs __iomem *)info->base;
Cannot you declare base as "void __iomem *" or something similar to avoid
all these casts?
> + bfin_write16(®->control, ppi->ppi_control);
> + }
> +
> + SSYNC();
> + return 0;
> +}
> +
> +static int ppi_stop(struct ppi_if *ppi)
> +{
> + const struct ppi_info *info = ppi->info;
> +
> + /* disable PPI */
> + ppi->ppi_control &= ~PORT_EN;
> + if (!strcmp(info->name, "ppi")) {
Wouldn't an "enum ppi_type" be better with the ability to do
switch (type) {
case PPI:
...
case EPPI:
...
}
?
> + struct bfin_ppi_regs __iomem *reg =
> + (struct bfin_ppi_regs __iomem *)info->base;
> + bfin_write16(®->control, ppi->ppi_control);
> + }
> +
> + /* disable DMA */
> + clear_dma_irqstat(info->dma_ch);
> + disable_dma(info->dma_ch);
> +
> + SSYNC();
> + return 0;
> +}
> +
> +static int ppi_set_params(struct ppi_if *ppi, struct ppi_params *params)
> +{
> + const struct ppi_info *info = ppi->info;
> +
> + ppi->bytes_per_line = params->width * params->bpp / 8;
> + ppi->lines_per_frame = params->height;
> +
> + /* config DMA */
> + ppi->dma_config = (DMA_FLOW_STOP | WNR | RESTART | DMA2D | DI_EN);
> + if (params->ppi_control & DMA32) {
> + ppi->dma_config |= WDSIZE_32;
> + set_dma_x_count(info->dma_ch, ppi->bytes_per_line >> 2);
> + set_dma_x_modify(info->dma_ch, 4);
> + set_dma_y_modify(info->dma_ch, 4);
> + } else {
> + ppi->dma_config |= WDSIZE_16;
> + set_dma_x_count(info->dma_ch, ppi->bytes_per_line >> 1);
> + set_dma_x_modify(info->dma_ch, 2);
> + set_dma_y_modify(info->dma_ch, 2);
> + }
> + set_dma_y_count(info->dma_ch, ppi->lines_per_frame);
> + set_dma_config(info->dma_ch, ppi->dma_config);
> +
> + /* config PPI */
> + ppi->ppi_control = params->ppi_control & ~PORT_EN;
> + if (!strcmp(info->name, "ppi")) {
> + struct bfin_ppi_regs __iomem *reg =
> + (struct bfin_ppi_regs __iomem *)info->base;
> + bfin_write16(®->control, ppi->ppi_control);
> + bfin_write16(®->count, ppi->bytes_per_line - 1);
> + bfin_write16(®->frame, ppi->lines_per_frame);
> + }
> +
> + SSYNC();
> + return 0;
> +}
> +
> +static void ppi_update_addr(struct ppi_if *ppi, unsigned long addr)
> +{
> + set_dma_start_addr(ppi->info->dma_ch, addr);
> +}
> +
> +struct ppi_if *ppi_create_instance(const struct ppi_info *info)
> +{
> + struct ppi_if *ppi;
> +
> + if (!info || !info->name || !info->pin_req)
> + return NULL;
> +
> + if (peripheral_request_list(info->pin_req, KBUILD_MODNAME)) {
> + pr_err("request peripheral failed\n");
> + return NULL;
> + }
> +
> + ppi = kzalloc(sizeof(*ppi), GFP_KERNEL);
> + if (!ppi) {
> + peripheral_free_list(info->pin_req);
> + pr_err("unable to allocate memory for ppi handle\n");
> + return NULL;
> + }
> + ppi->ops = &ppi_ops;
> + ppi->info = info;
> +
> + pr_info("ppi probe success\n");
> + return ppi;
> +}
> +
> +void ppi_delete_instance(struct ppi_if *ppi)
> +{
> + peripheral_free_list(ppi->info->pin_req);
> + kfree(ppi);
> +}
> diff --git a/include/media/blackfin/bfin_capture.h
> b/include/media/blackfin/bfin_capture.h
> new file mode 100644
> index 0000000..0905837
> --- /dev/null
> +++ b/include/media/blackfin/bfin_capture.h
> @@ -0,0 +1,33 @@
> +#ifndef _BFIN_CAPTURE_H_
> +#define _BFIN_CAPTURE_H_
> +
> +#include <linux/i2c.h>
> +#include <linux/videodev2.h>
> +
> +#include <media/blackfin/ppi.h>
Looks like you only really need i2c.h, for others you can just
forward-declare structs.
> +
> +struct bcap_route {
> + u32 input;
> + u32 output;
> +};
> +
> +struct bfin_capture_config {
> + /* card name */
> + char *card_name;
> + /* inputs available at the sub device */
> + struct v4l2_input *inputs;
> + /* number of inputs supported */
> + int num_inputs;
> + /* routing information for each input */
> + struct bcap_route *routes;
> + /* i2c bus adapter no */
> + int i2c_adapter_id;
> + /* i2c subdevice board info */
> + struct i2c_board_info board_info;
> + /* ppi board info */
> + const struct ppi_info *ppi_info;
> + /* ppi control */
> + unsigned short ppi_control;
> +};
> +
> +#endif
> diff --git a/include/media/blackfin/ppi.h b/include/media/blackfin/ppi.h
> new file mode 100644
> index 0000000..4e7711a
> --- /dev/null
> +++ b/include/media/blackfin/ppi.h
> @@ -0,0 +1,63 @@
> +/*
> + * Analog Devices PPI header file
> + *
> + * 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.
> + */
> +
> +#ifndef _PPI_H_
> +#define _PPI_H_
> +
> +#include <linux/interrupt.h>
> +
> +struct ppi_if;
> +
> +struct ppi_params {
> + int width;
> + int height;
> + int bpp;
> + unsigned short ppi_control;
> +};
> +
> +struct ppi_ops {
> + int (*attach_irq)(struct ppi_if *ppi, irq_handler_t handler);
> + void (*detach_irq)(struct ppi_if *ppi);
> + int (*start)(struct ppi_if *ppi);
> + int (*stop)(struct ppi_if *ppi);
> + int (*set_params)(struct ppi_if *ppi, struct ppi_params *params);
> + void (*update_addr)(struct ppi_if *ppi, unsigned long addr);
> +};
> +
> +struct ppi_info {
> + const char *name; /* ppi or eppi */
> + int dma_ch;
> + int irq_err;
> + unsigned long base;
> + const unsigned short *pin_req;
> +};
> +
> +struct ppi_if {
> + int dma_config;
> + int bytes_per_line;
> + int lines_per_frame;
> + unsigned short ppi_control;
> + const struct ppi_ops *ops;
> + const struct ppi_info *info;
> + void *priv;
> +};
> +
> +struct ppi_if *ppi_create_instance(const struct ppi_info *info);
> +void ppi_delete_instance(struct ppi_if *ppi);
> +#endif
> --
> 1.7.0.4
Thanks
Guennadi
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/
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