Commit fc96d58c authored by Sergio Aguirre's avatar Sergio Aguirre Committed by Mauro Carvalho Chehab

[media] v4l: omap4iss: Add support for OMAP4 camera interface - Video devices

This adds a very simplistic driver to utilize the CSI2A interface inside
the ISS subsystem in OMAP4, and dump the data to memory.
Check Documentation/video4linux/omap4_camera.txt for details.
This commit adds video devices support.
Signed-off-by: default avatarSergio Aguirre <sergio.a.aguirre@gmail.com>
Signed-off-by: default avatarLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: default avatarHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent 59f0ad80
/*
* TI OMAP4 ISS V4L2 Driver - Generic video node
*
* Copyright (C) 2012 Texas Instruments, Inc.
*
* Author: Sergio Aguirre <sergio.a.aguirre@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <asm/cacheflush.h>
#include <linux/clk.h>
#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/module.h>
#include <media/v4l2-dev.h>
#include <media/v4l2-ioctl.h>
#include "iss_video.h"
#include "iss.h"
/* -----------------------------------------------------------------------------
* Helper functions
*/
static struct iss_format_info formats[] = {
{ V4L2_MBUS_FMT_Y8_1X8, V4L2_MBUS_FMT_Y8_1X8,
V4L2_MBUS_FMT_Y8_1X8, V4L2_MBUS_FMT_Y8_1X8,
V4L2_PIX_FMT_GREY, 8, },
{ V4L2_MBUS_FMT_Y10_1X10, V4L2_MBUS_FMT_Y10_1X10,
V4L2_MBUS_FMT_Y10_1X10, V4L2_MBUS_FMT_Y8_1X8,
V4L2_PIX_FMT_Y10, 10, },
{ V4L2_MBUS_FMT_Y12_1X12, V4L2_MBUS_FMT_Y10_1X10,
V4L2_MBUS_FMT_Y12_1X12, V4L2_MBUS_FMT_Y8_1X8,
V4L2_PIX_FMT_Y12, 12, },
{ V4L2_MBUS_FMT_SBGGR8_1X8, V4L2_MBUS_FMT_SBGGR8_1X8,
V4L2_MBUS_FMT_SBGGR8_1X8, V4L2_MBUS_FMT_SBGGR8_1X8,
V4L2_PIX_FMT_SBGGR8, 8, },
{ V4L2_MBUS_FMT_SGBRG8_1X8, V4L2_MBUS_FMT_SGBRG8_1X8,
V4L2_MBUS_FMT_SGBRG8_1X8, V4L2_MBUS_FMT_SGBRG8_1X8,
V4L2_PIX_FMT_SGBRG8, 8, },
{ V4L2_MBUS_FMT_SGRBG8_1X8, V4L2_MBUS_FMT_SGRBG8_1X8,
V4L2_MBUS_FMT_SGRBG8_1X8, V4L2_MBUS_FMT_SGRBG8_1X8,
V4L2_PIX_FMT_SGRBG8, 8, },
{ V4L2_MBUS_FMT_SRGGB8_1X8, V4L2_MBUS_FMT_SRGGB8_1X8,
V4L2_MBUS_FMT_SRGGB8_1X8, V4L2_MBUS_FMT_SRGGB8_1X8,
V4L2_PIX_FMT_SRGGB8, 8, },
{ V4L2_MBUS_FMT_SGRBG10_DPCM8_1X8, V4L2_MBUS_FMT_SGRBG10_DPCM8_1X8,
V4L2_MBUS_FMT_SGRBG10_1X10, 0,
V4L2_PIX_FMT_SGRBG10DPCM8, 8, },
{ V4L2_MBUS_FMT_SBGGR10_1X10, V4L2_MBUS_FMT_SBGGR10_1X10,
V4L2_MBUS_FMT_SBGGR10_1X10, V4L2_MBUS_FMT_SBGGR8_1X8,
V4L2_PIX_FMT_SBGGR10, 10, },
{ V4L2_MBUS_FMT_SGBRG10_1X10, V4L2_MBUS_FMT_SGBRG10_1X10,
V4L2_MBUS_FMT_SGBRG10_1X10, V4L2_MBUS_FMT_SGBRG8_1X8,
V4L2_PIX_FMT_SGBRG10, 10, },
{ V4L2_MBUS_FMT_SGRBG10_1X10, V4L2_MBUS_FMT_SGRBG10_1X10,
V4L2_MBUS_FMT_SGRBG10_1X10, V4L2_MBUS_FMT_SGRBG8_1X8,
V4L2_PIX_FMT_SGRBG10, 10, },
{ V4L2_MBUS_FMT_SRGGB10_1X10, V4L2_MBUS_FMT_SRGGB10_1X10,
V4L2_MBUS_FMT_SRGGB10_1X10, V4L2_MBUS_FMT_SRGGB8_1X8,
V4L2_PIX_FMT_SRGGB10, 10, },
{ V4L2_MBUS_FMT_SBGGR12_1X12, V4L2_MBUS_FMT_SBGGR10_1X10,
V4L2_MBUS_FMT_SBGGR12_1X12, V4L2_MBUS_FMT_SBGGR8_1X8,
V4L2_PIX_FMT_SBGGR12, 12, },
{ V4L2_MBUS_FMT_SGBRG12_1X12, V4L2_MBUS_FMT_SGBRG10_1X10,
V4L2_MBUS_FMT_SGBRG12_1X12, V4L2_MBUS_FMT_SGBRG8_1X8,
V4L2_PIX_FMT_SGBRG12, 12, },
{ V4L2_MBUS_FMT_SGRBG12_1X12, V4L2_MBUS_FMT_SGRBG10_1X10,
V4L2_MBUS_FMT_SGRBG12_1X12, V4L2_MBUS_FMT_SGRBG8_1X8,
V4L2_PIX_FMT_SGRBG12, 12, },
{ V4L2_MBUS_FMT_SRGGB12_1X12, V4L2_MBUS_FMT_SRGGB10_1X10,
V4L2_MBUS_FMT_SRGGB12_1X12, V4L2_MBUS_FMT_SRGGB8_1X8,
V4L2_PIX_FMT_SRGGB12, 12, },
{ V4L2_MBUS_FMT_UYVY8_1X16, V4L2_MBUS_FMT_UYVY8_1X16,
V4L2_MBUS_FMT_UYVY8_1X16, 0,
V4L2_PIX_FMT_UYVY, 16, },
{ V4L2_MBUS_FMT_YUYV8_1X16, V4L2_MBUS_FMT_YUYV8_1X16,
V4L2_MBUS_FMT_YUYV8_1X16, 0,
V4L2_PIX_FMT_YUYV, 16, },
{ V4L2_MBUS_FMT_YUYV8_1_5X8, V4L2_MBUS_FMT_YUYV8_1_5X8,
V4L2_MBUS_FMT_YUYV8_1_5X8, 0,
V4L2_PIX_FMT_NV12, 8, },
};
const struct iss_format_info *
omap4iss_video_format_info(enum v4l2_mbus_pixelcode code)
{
unsigned int i;
for (i = 0; i < ARRAY_SIZE(formats); ++i) {
if (formats[i].code == code)
return &formats[i];
}
return NULL;
}
/*
* iss_video_mbus_to_pix - Convert v4l2_mbus_framefmt to v4l2_pix_format
* @video: ISS video instance
* @mbus: v4l2_mbus_framefmt format (input)
* @pix: v4l2_pix_format format (output)
*
* Fill the output pix structure with information from the input mbus format.
* The bytesperline and sizeimage fields are computed from the requested bytes
* per line value in the pix format and information from the video instance.
*
* Return the number of padding bytes at end of line.
*/
static unsigned int iss_video_mbus_to_pix(const struct iss_video *video,
const struct v4l2_mbus_framefmt *mbus,
struct v4l2_pix_format *pix)
{
unsigned int bpl = pix->bytesperline;
unsigned int min_bpl;
unsigned int i;
memset(pix, 0, sizeof(*pix));
pix->width = mbus->width;
pix->height = mbus->height;
/* Skip the last format in the loop so that it will be selected if no
* match is found.
*/
for (i = 0; i < ARRAY_SIZE(formats) - 1; ++i) {
if (formats[i].code == mbus->code)
break;
}
min_bpl = pix->width * ALIGN(formats[i].bpp, 8) / 8;
/* Clamp the requested bytes per line value. If the maximum bytes per
* line value is zero, the module doesn't support user configurable line
* sizes. Override the requested value with the minimum in that case.
*/
if (video->bpl_max)
bpl = clamp(bpl, min_bpl, video->bpl_max);
else
bpl = min_bpl;
if (!video->bpl_zero_padding || bpl != min_bpl)
bpl = ALIGN(bpl, video->bpl_alignment);
pix->pixelformat = formats[i].pixelformat;
pix->bytesperline = bpl;
pix->sizeimage = pix->bytesperline * pix->height;
pix->colorspace = mbus->colorspace;
pix->field = mbus->field;
/* FIXME: Special case for NV12! We should make this nicer... */
if (pix->pixelformat == V4L2_PIX_FMT_NV12)
pix->sizeimage += (pix->bytesperline * pix->height) / 2;
return bpl - min_bpl;
}
static void iss_video_pix_to_mbus(const struct v4l2_pix_format *pix,
struct v4l2_mbus_framefmt *mbus)
{
unsigned int i;
memset(mbus, 0, sizeof(*mbus));
mbus->width = pix->width;
mbus->height = pix->height;
for (i = 0; i < ARRAY_SIZE(formats); ++i) {
if (formats[i].pixelformat == pix->pixelformat)
break;
}
if (WARN_ON(i == ARRAY_SIZE(formats)))
return;
mbus->code = formats[i].code;
mbus->colorspace = pix->colorspace;
mbus->field = pix->field;
}
static struct v4l2_subdev *
iss_video_remote_subdev(struct iss_video *video, u32 *pad)
{
struct media_pad *remote;
remote = media_entity_remote_pad(&video->pad);
if (remote == NULL ||
media_entity_type(remote->entity) != MEDIA_ENT_T_V4L2_SUBDEV)
return NULL;
if (pad)
*pad = remote->index;
return media_entity_to_v4l2_subdev(remote->entity);
}
/* Return a pointer to the ISS video instance at the far end of the pipeline. */
static struct iss_video *
iss_video_far_end(struct iss_video *video)
{
struct media_entity_graph graph;
struct media_entity *entity = &video->video.entity;
struct media_device *mdev = entity->parent;
struct iss_video *far_end = NULL;
mutex_lock(&mdev->graph_mutex);
media_entity_graph_walk_start(&graph, entity);
while ((entity = media_entity_graph_walk_next(&graph))) {
if (entity == &video->video.entity)
continue;
if (media_entity_type(entity) != MEDIA_ENT_T_DEVNODE)
continue;
far_end = to_iss_video(media_entity_to_video_device(entity));
if (far_end->type != video->type)
break;
far_end = NULL;
}
mutex_unlock(&mdev->graph_mutex);
return far_end;
}
static int
__iss_video_get_format(struct iss_video *video, struct v4l2_format *format)
{
struct v4l2_subdev_format fmt;
struct v4l2_subdev *subdev;
u32 pad;
int ret;
subdev = iss_video_remote_subdev(video, &pad);
if (subdev == NULL)
return -EINVAL;
mutex_lock(&video->mutex);
fmt.pad = pad;
fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &fmt);
if (ret == -ENOIOCTLCMD)
ret = -EINVAL;
mutex_unlock(&video->mutex);
if (ret)
return ret;
format->type = video->type;
return iss_video_mbus_to_pix(video, &fmt.format, &format->fmt.pix);
}
static int
iss_video_check_format(struct iss_video *video, struct iss_video_fh *vfh)
{
struct v4l2_format format;
int ret;
memcpy(&format, &vfh->format, sizeof(format));
ret = __iss_video_get_format(video, &format);
if (ret < 0)
return ret;
if (vfh->format.fmt.pix.pixelformat != format.fmt.pix.pixelformat ||
vfh->format.fmt.pix.height != format.fmt.pix.height ||
vfh->format.fmt.pix.width != format.fmt.pix.width ||
vfh->format.fmt.pix.bytesperline != format.fmt.pix.bytesperline ||
vfh->format.fmt.pix.sizeimage != format.fmt.pix.sizeimage)
return -EINVAL;
return ret;
}
/* -----------------------------------------------------------------------------
* Video queue operations
*/
static int iss_video_queue_setup(struct vb2_queue *vq, const struct v4l2_format *fmt,
unsigned int *count, unsigned int *num_planes,
unsigned int sizes[], void *alloc_ctxs[])
{
struct iss_video_fh *vfh = vb2_get_drv_priv(vq);
struct iss_video *video = vfh->video;
/* Revisit multi-planar support for NV12 */
*num_planes = 1;
sizes[0] = vfh->format.fmt.pix.sizeimage;
if (sizes[0] == 0)
return -EINVAL;
alloc_ctxs[0] = video->alloc_ctx;
*count = min(*count, (unsigned int)(video->capture_mem / PAGE_ALIGN(sizes[0])));
return 0;
}
static void iss_video_buf_cleanup(struct vb2_buffer *vb)
{
struct iss_buffer *buffer = container_of(vb, struct iss_buffer, vb);
if (buffer->iss_addr)
buffer->iss_addr = 0;
}
static int iss_video_buf_prepare(struct vb2_buffer *vb)
{
struct iss_video_fh *vfh = vb2_get_drv_priv(vb->vb2_queue);
struct iss_buffer *buffer = container_of(vb, struct iss_buffer, vb);
struct iss_video *video = vfh->video;
unsigned long size = vfh->format.fmt.pix.sizeimage;
dma_addr_t addr;
if (vb2_plane_size(vb, 0) < size)
return -ENOBUFS;
addr = vb2_dma_contig_plane_dma_addr(vb, 0);
if (!IS_ALIGNED(addr, 32)) {
dev_dbg(video->iss->dev, "Buffer address must be "
"aligned to 32 bytes boundary.\n");
return -EINVAL;
}
vb2_set_plane_payload(vb, 0, size);
buffer->iss_addr = addr;
return 0;
}
static void iss_video_buf_queue(struct vb2_buffer *vb)
{
struct iss_video_fh *vfh = vb2_get_drv_priv(vb->vb2_queue);
struct iss_video *video = vfh->video;
struct iss_buffer *buffer = container_of(vb, struct iss_buffer, vb);
struct iss_pipeline *pipe = to_iss_pipeline(&video->video.entity);
unsigned int empty;
unsigned long flags;
spin_lock_irqsave(&video->qlock, flags);
empty = list_empty(&video->dmaqueue);
list_add_tail(&buffer->list, &video->dmaqueue);
spin_unlock_irqrestore(&video->qlock, flags);
if (empty) {
enum iss_pipeline_state state;
unsigned int start;
if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
state = ISS_PIPELINE_QUEUE_OUTPUT;
else
state = ISS_PIPELINE_QUEUE_INPUT;
spin_lock_irqsave(&pipe->lock, flags);
pipe->state |= state;
video->ops->queue(video, buffer);
video->dmaqueue_flags |= ISS_VIDEO_DMAQUEUE_QUEUED;
start = iss_pipeline_ready(pipe);
if (start)
pipe->state |= ISS_PIPELINE_STREAM;
spin_unlock_irqrestore(&pipe->lock, flags);
if (start)
omap4iss_pipeline_set_stream(pipe,
ISS_PIPELINE_STREAM_SINGLESHOT);
}
}
static struct vb2_ops iss_video_vb2ops = {
.queue_setup = iss_video_queue_setup,
.buf_prepare = iss_video_buf_prepare,
.buf_queue = iss_video_buf_queue,
.buf_cleanup = iss_video_buf_cleanup,
};
/*
* omap4iss_video_buffer_next - Complete the current buffer and return the next
* @video: ISS video object
*
* Remove the current video buffer from the DMA queue and fill its timestamp,
* field count and state fields before waking up its completion handler.
*
* For capture video nodes, the buffer state is set to VB2_BUF_STATE_DONE if no
* error has been flagged in the pipeline, or to VB2_BUF_STATE_ERROR otherwise.
*
* The DMA queue is expected to contain at least one buffer.
*
* Return a pointer to the next buffer in the DMA queue, or NULL if the queue is
* empty.
*/
struct iss_buffer *omap4iss_video_buffer_next(struct iss_video *video)
{
struct iss_pipeline *pipe = to_iss_pipeline(&video->video.entity);
enum iss_pipeline_state state;
struct iss_buffer *buf;
unsigned long flags;
struct timespec ts;
spin_lock_irqsave(&video->qlock, flags);
if (WARN_ON(list_empty(&video->dmaqueue))) {
spin_unlock_irqrestore(&video->qlock, flags);
return NULL;
}
buf = list_first_entry(&video->dmaqueue, struct iss_buffer,
list);
list_del(&buf->list);
spin_unlock_irqrestore(&video->qlock, flags);
ktime_get_ts(&ts);
buf->vb.v4l2_buf.timestamp.tv_sec = ts.tv_sec;
buf->vb.v4l2_buf.timestamp.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
/* Do frame number propagation only if this is the output video node.
* Frame number either comes from the CSI receivers or it gets
* incremented here if H3A is not active.
* Note: There is no guarantee that the output buffer will finish
* first, so the input number might lag behind by 1 in some cases.
*/
if (video == pipe->output && !pipe->do_propagation)
buf->vb.v4l2_buf.sequence = atomic_inc_return(&pipe->frame_number);
else
buf->vb.v4l2_buf.sequence = atomic_read(&pipe->frame_number);
vb2_buffer_done(&buf->vb, pipe->error ? VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
pipe->error = false;
spin_lock_irqsave(&video->qlock, flags);
if (list_empty(&video->dmaqueue)) {
spin_unlock_irqrestore(&video->qlock, flags);
if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
state = ISS_PIPELINE_QUEUE_OUTPUT
| ISS_PIPELINE_STREAM;
else
state = ISS_PIPELINE_QUEUE_INPUT
| ISS_PIPELINE_STREAM;
spin_lock_irqsave(&pipe->lock, flags);
pipe->state &= ~state;
if (video->pipe.stream_state == ISS_PIPELINE_STREAM_CONTINUOUS)
video->dmaqueue_flags |= ISS_VIDEO_DMAQUEUE_UNDERRUN;
spin_unlock_irqrestore(&pipe->lock, flags);
return NULL;
}
if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE && pipe->input != NULL) {
spin_lock_irqsave(&pipe->lock, flags);
pipe->state &= ~ISS_PIPELINE_STREAM;
spin_unlock_irqrestore(&pipe->lock, flags);
}
buf = list_first_entry(&video->dmaqueue, struct iss_buffer,
list);
spin_unlock_irqrestore(&video->qlock, flags);
buf->vb.state = VB2_BUF_STATE_ACTIVE;
return buf;
}
/* -----------------------------------------------------------------------------
* V4L2 ioctls
*/
static int
iss_video_querycap(struct file *file, void *fh, struct v4l2_capability *cap)
{
struct iss_video *video = video_drvdata(file);
strlcpy(cap->driver, ISS_VIDEO_DRIVER_NAME, sizeof(cap->driver));
strlcpy(cap->card, video->video.name, sizeof(cap->card));
strlcpy(cap->bus_info, "media", sizeof(cap->bus_info));
if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
else
cap->capabilities = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;
return 0;
}
static int
iss_video_get_format(struct file *file, void *fh, struct v4l2_format *format)
{
struct iss_video_fh *vfh = to_iss_video_fh(fh);
struct iss_video *video = video_drvdata(file);
if (format->type != video->type)
return -EINVAL;
mutex_lock(&video->mutex);
*format = vfh->format;
mutex_unlock(&video->mutex);
return 0;
}
static int
iss_video_set_format(struct file *file, void *fh, struct v4l2_format *format)
{
struct iss_video_fh *vfh = to_iss_video_fh(fh);
struct iss_video *video = video_drvdata(file);
struct v4l2_mbus_framefmt fmt;
if (format->type != video->type)
return -EINVAL;
mutex_lock(&video->mutex);
/* Fill the bytesperline and sizeimage fields by converting to media bus
* format and back to pixel format.
*/
iss_video_pix_to_mbus(&format->fmt.pix, &fmt);
iss_video_mbus_to_pix(video, &fmt, &format->fmt.pix);
vfh->format = *format;
mutex_unlock(&video->mutex);
return 0;
}
static int
iss_video_try_format(struct file *file, void *fh, struct v4l2_format *format)
{
struct iss_video *video = video_drvdata(file);
struct v4l2_subdev_format fmt;
struct v4l2_subdev *subdev;
u32 pad;
int ret;
if (format->type != video->type)
return -EINVAL;
subdev = iss_video_remote_subdev(video, &pad);
if (subdev == NULL)
return -EINVAL;
iss_video_pix_to_mbus(&format->fmt.pix, &fmt.format);
fmt.pad = pad;
fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &fmt);
if (ret)
return ret == -ENOIOCTLCMD ? -EINVAL : ret;
iss_video_mbus_to_pix(video, &fmt.format, &format->fmt.pix);
return 0;
}
static int
iss_video_cropcap(struct file *file, void *fh, struct v4l2_cropcap *cropcap)
{
struct iss_video *video = video_drvdata(file);
struct v4l2_subdev *subdev;
int ret;
subdev = iss_video_remote_subdev(video, NULL);
if (subdev == NULL)
return -EINVAL;
mutex_lock(&video->mutex);
ret = v4l2_subdev_call(subdev, video, cropcap, cropcap);
mutex_unlock(&video->mutex);
return ret == -ENOIOCTLCMD ? -EINVAL : ret;
}
static int
iss_video_get_crop(struct file *file, void *fh, struct v4l2_crop *crop)
{
struct iss_video *video = video_drvdata(file);
struct v4l2_subdev_format format;
struct v4l2_subdev *subdev;
u32 pad;
int ret;
subdev = iss_video_remote_subdev(video, &pad);
if (subdev == NULL)
return -EINVAL;
/* Try the get crop operation first and fallback to get format if not
* implemented.
*/
ret = v4l2_subdev_call(subdev, video, g_crop, crop);
if (ret != -ENOIOCTLCMD)
return ret;
format.pad = pad;
format.which = V4L2_SUBDEV_FORMAT_ACTIVE;
ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &format);
if (ret < 0)
return ret == -ENOIOCTLCMD ? -EINVAL : ret;
crop->c.left = 0;
crop->c.top = 0;
crop->c.width = format.format.width;
crop->c.height = format.format.height;
return 0;
}
static int
iss_video_set_crop(struct file *file, void *fh, const struct v4l2_crop *crop)
{
struct iss_video *video = video_drvdata(file);
struct v4l2_subdev *subdev;
int ret;
subdev = iss_video_remote_subdev(video, NULL);
if (subdev == NULL)
return -EINVAL;
mutex_lock(&video->mutex);
ret = v4l2_subdev_call(subdev, video, s_crop, crop);
mutex_unlock(&video->mutex);
return ret == -ENOIOCTLCMD ? -EINVAL : ret;
}
static int
iss_video_get_param(struct file *file, void *fh, struct v4l2_streamparm *a)
{
struct iss_video_fh *vfh = to_iss_video_fh(fh);
struct iss_video *video = video_drvdata(file);
if (video->type != V4L2_BUF_TYPE_VIDEO_OUTPUT ||
video->type != a->type)
return -EINVAL;
memset(a, 0, sizeof(*a));
a->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
a->parm.output.capability = V4L2_CAP_TIMEPERFRAME;
a->parm.output.timeperframe = vfh->timeperframe;
return 0;
}
static int
iss_video_set_param(struct file *file, void *fh, struct v4l2_streamparm *a)
{
struct iss_video_fh *vfh = to_iss_video_fh(fh);
struct iss_video *video = video_drvdata(file);
if (video->type != V4L2_BUF_TYPE_VIDEO_OUTPUT ||
video->type != a->type)
return -EINVAL;
if (a->parm.output.timeperframe.denominator == 0)
a->parm.output.timeperframe.denominator = 1;
vfh->timeperframe = a->parm.output.timeperframe;
return 0;
}
static int
iss_video_reqbufs(struct file *file, void *fh, struct v4l2_requestbuffers *rb)
{
struct iss_video_fh *vfh = to_iss_video_fh(fh);
return vb2_reqbufs(&vfh->queue, rb);
}
static int
iss_video_querybuf(struct file *file, void *fh, struct v4l2_buffer *b)
{
struct iss_video_fh *vfh = to_iss_video_fh(fh);
return vb2_querybuf(&vfh->queue, b);
}
static int
iss_video_qbuf(struct file *file, void *fh, struct v4l2_buffer *b)
{
struct iss_video_fh *vfh = to_iss_video_fh(fh);
return vb2_qbuf(&vfh->queue, b);
}
static int
iss_video_dqbuf(struct file *file, void *fh, struct v4l2_buffer *b)
{
struct iss_video_fh *vfh = to_iss_video_fh(fh);
return vb2_dqbuf(&vfh->queue, b, file->f_flags & O_NONBLOCK);
}
/*
* Stream management
*
* Every ISS pipeline has a single input and a single output. The input can be
* either a sensor or a video node. The output is always a video node.
*
* As every pipeline has an output video node, the ISS video objects at the
* pipeline output stores the pipeline state. It tracks the streaming state of
* both the input and output, as well as the availability of buffers.
*
* In sensor-to-memory mode, frames are always available at the pipeline input.
* Starting the sensor usually requires I2C transfers and must be done in
* interruptible context. The pipeline is started and stopped synchronously
* to the stream on/off commands. All modules in the pipeline will get their
* subdev set stream handler called. The module at the end of the pipeline must
* delay starting the hardware until buffers are available at its output.
*
* In memory-to-memory mode, starting/stopping the stream requires
* synchronization between the input and output. ISS modules can't be stopped
* in the middle of a frame, and at least some of the modules seem to become
* busy as soon as they're started, even if they don't receive a frame start
* event. For that reason frames need to be processed in single-shot mode. The
* driver needs to wait until a frame is completely processed and written to
* memory before restarting the pipeline for the next frame. Pipelined
* processing might be possible but requires more testing.
*
* Stream start must be delayed until buffers are available at both the input
* and output. The pipeline must be started in the videobuf queue callback with
* the buffers queue spinlock held. The modules subdev set stream operation must
* not sleep.
*/
static int
iss_video_streamon(struct file *file, void *fh, enum v4l2_buf_type type)
{
struct iss_video_fh *vfh = to_iss_video_fh(fh);
struct iss_video *video = video_drvdata(file);
enum iss_pipeline_state state;
struct iss_pipeline *pipe;
struct iss_video *far_end;
unsigned long flags;
int ret;
if (type != video->type)
return -EINVAL;
mutex_lock(&video->stream_lock);
if (video->streaming) {
mutex_unlock(&video->stream_lock);
return -EBUSY;
}
/* Start streaming on the pipeline. No link touching an entity in the
* pipeline can be activated or deactivated once streaming is started.
*/
pipe = video->video.entity.pipe
? to_iss_pipeline(&video->video.entity) : &video->pipe;
pipe->external = NULL;
pipe->external_rate = 0;
pipe->external_bpp = 0;
if (video->iss->pdata->set_constraints)
video->iss->pdata->set_constraints(video->iss, true);
ret = media_entity_pipeline_start(&video->video.entity, &pipe->pipe);
if (ret < 0)
goto err_media_entity_pipeline_start;
/* Verify that the currently configured format matches the output of
* the connected subdev.
*/
ret = iss_video_check_format(video, vfh);
if (ret < 0)
goto err_iss_video_check_format;
video->bpl_padding = ret;
video->bpl_value = vfh->format.fmt.pix.bytesperline;
/* Find the ISS video node connected at the far end of the pipeline and
* update the pipeline.
*/
far_end = iss_video_far_end(video);
if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
state = ISS_PIPELINE_STREAM_OUTPUT | ISS_PIPELINE_IDLE_OUTPUT;
pipe->input = far_end;
pipe->output = video;
} else {
if (far_end == NULL) {
ret = -EPIPE;
goto err_iss_video_check_format;
}
state = ISS_PIPELINE_STREAM_INPUT | ISS_PIPELINE_IDLE_INPUT;
pipe->input = video;
pipe->output = far_end;
}
spin_lock_irqsave(&pipe->lock, flags);
pipe->state &= ~ISS_PIPELINE_STREAM;
pipe->state |= state;
spin_unlock_irqrestore(&pipe->lock, flags);
/* Set the maximum time per frame as the value requested by userspace.
* This is a soft limit that can be overridden if the hardware doesn't
* support the request limit.
*/
if (video->type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
pipe->max_timeperframe = vfh->timeperframe;
video->queue = &vfh->queue;
INIT_LIST_HEAD(&video->dmaqueue);
spin_lock_init(&video->qlock);
atomic_set(&pipe->frame_number, -1);
ret = vb2_streamon(&vfh->queue, type);
if (ret < 0)
goto err_iss_video_check_format;
/* In sensor-to-memory mode, the stream can be started synchronously
* to the stream on command. In memory-to-memory mode, it will be
* started when buffers are queued on both the input and output.
*/
if (pipe->input == NULL) {
unsigned long flags;
ret = omap4iss_pipeline_set_stream(pipe,
ISS_PIPELINE_STREAM_CONTINUOUS);
if (ret < 0)
goto err_omap4iss_set_stream;
spin_lock_irqsave(&video->qlock, flags);
if (list_empty(&video->dmaqueue))
video->dmaqueue_flags |= ISS_VIDEO_DMAQUEUE_UNDERRUN;
spin_unlock_irqrestore(&video->qlock, flags);
}
if (ret < 0) {
err_omap4iss_set_stream:
vb2_streamoff(&vfh->queue, type);
err_iss_video_check_format:
media_entity_pipeline_stop(&video->video.entity);
err_media_entity_pipeline_start:
if (video->iss->pdata->set_constraints)
video->iss->pdata->set_constraints(video->iss, false);
video->queue = NULL;
}
if (!ret)
video->streaming = 1;
mutex_unlock(&video->stream_lock);
return ret;
}
static int
iss_video_streamoff(struct file *file, void *fh, enum v4l2_buf_type type)
{
struct iss_video_fh *vfh = to_iss_video_fh(fh);
struct iss_video *video = video_drvdata(file);
struct iss_pipeline *pipe = to_iss_pipeline(&video->video.entity);
enum iss_pipeline_state state;
unsigned long flags;
if (type != video->type)
return -EINVAL;
mutex_lock(&video->stream_lock);
if (!vb2_is_streaming(&vfh->queue))
goto done;
/* Update the pipeline state. */
if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
state = ISS_PIPELINE_STREAM_OUTPUT
| ISS_PIPELINE_QUEUE_OUTPUT;
else
state = ISS_PIPELINE_STREAM_INPUT
| ISS_PIPELINE_QUEUE_INPUT;
spin_lock_irqsave(&pipe->lock, flags);
pipe->state &= ~state;
spin_unlock_irqrestore(&pipe->lock, flags);
/* Stop the stream. */
omap4iss_pipeline_set_stream(pipe, ISS_PIPELINE_STREAM_STOPPED);
vb2_streamoff(&vfh->queue, type);
video->queue = NULL;
video->streaming = 0;
if (video->iss->pdata->set_constraints)
video->iss->pdata->set_constraints(video->iss, false);
media_entity_pipeline_stop(&video->video.entity);
done:
mutex_unlock(&video->stream_lock);
return 0;
}
static int
iss_video_enum_input(struct file *file, void *fh, struct v4l2_input *input)
{
if (input->index > 0)
return -EINVAL;
strlcpy(input->name, "camera", sizeof(input->name));
input->type = V4L2_INPUT_TYPE_CAMERA;
return 0;
}
static int
iss_video_g_input(struct file *file, void *fh, unsigned int *input)
{
*input = 0;
return 0;
}
static const struct v4l2_ioctl_ops iss_video_ioctl_ops = {
.vidioc_querycap = iss_video_querycap,
.vidioc_g_fmt_vid_cap = iss_video_get_format,
.vidioc_s_fmt_vid_cap = iss_video_set_format,
.vidioc_try_fmt_vid_cap = iss_video_try_format,
.vidioc_g_fmt_vid_out = iss_video_get_format,
.vidioc_s_fmt_vid_out = iss_video_set_format,
.vidioc_try_fmt_vid_out = iss_video_try_format,
.vidioc_cropcap = iss_video_cropcap,
.vidioc_g_crop = iss_video_get_crop,
.vidioc_s_crop = iss_video_set_crop,
.vidioc_g_parm = iss_video_get_param,
.vidioc_s_parm = iss_video_set_param,
.vidioc_reqbufs = iss_video_reqbufs,
.vidioc_querybuf = iss_video_querybuf,
.vidioc_qbuf = iss_video_qbuf,
.vidioc_dqbuf = iss_video_dqbuf,
.vidioc_streamon = iss_video_streamon,
.vidioc_streamoff = iss_video_streamoff,
.vidioc_enum_input = iss_video_enum_input,
.vidioc_g_input = iss_video_g_input,
};
/* -----------------------------------------------------------------------------
* V4L2 file operations
*/
static int iss_video_open(struct file *file)
{
struct iss_video *video = video_drvdata(file);
struct iss_video_fh *handle;
struct vb2_queue *q;
int ret = 0;
handle = kzalloc(sizeof(*handle), GFP_KERNEL);
if (handle == NULL)
return -ENOMEM;
v4l2_fh_init(&handle->vfh, &video->video);
v4l2_fh_add(&handle->vfh);
/* If this is the first user, initialise the pipeline. */
if (omap4iss_get(video->iss) == NULL) {
ret = -EBUSY;
goto done;
}
ret = omap4iss_pipeline_pm_use(&video->video.entity, 1);
if (ret < 0) {
omap4iss_put(video->iss);
goto done;
}
video->alloc_ctx = vb2_dma_contig_init_ctx(video->iss->dev);
if (IS_ERR(video->alloc_ctx)) {
ret = PTR_ERR(video->alloc_ctx);
omap4iss_put(video->iss);
goto done;
}
q = &handle->queue;
q->type = video->type;
q->io_modes = VB2_MMAP;
q->drv_priv = handle;
q->ops = &iss_video_vb2ops;
q->mem_ops = &vb2_dma_contig_memops;
q->buf_struct_size = sizeof(struct iss_buffer);
ret = vb2_queue_init(q);
if (ret) {
omap4iss_put(video->iss);
goto done;
}
memset(&handle->format, 0, sizeof(handle->format));
handle->format.type = video->type;
handle->timeperframe.denominator = 1;
handle->video = video;
file->private_data = &handle->vfh;
done:
if (ret < 0) {
v4l2_fh_del(&handle->vfh);
kfree(handle);
}
return ret;
}
static int iss_video_release(struct file *file)
{
struct iss_video *video = video_drvdata(file);
struct v4l2_fh *vfh = file->private_data;
struct iss_video_fh *handle = to_iss_video_fh(vfh);
/* Disable streaming and free the buffers queue resources. */
iss_video_streamoff(file, vfh, video->type);
omap4iss_pipeline_pm_use(&video->video.entity, 0);
/* Release the videobuf2 queue */
vb2_queue_release(&handle->queue);
/* Release the file handle. */
v4l2_fh_del(vfh);
kfree(handle);
file->private_data = NULL;
omap4iss_put(video->iss);
return 0;
}
static unsigned int iss_video_poll(struct file *file, poll_table *wait)
{
struct iss_video_fh *vfh = to_iss_video_fh(file->private_data);
return vb2_poll(&vfh->queue, file, wait);
}
static int iss_video_mmap(struct file *file, struct vm_area_struct *vma)
{
struct iss_video_fh *vfh = to_iss_video_fh(file->private_data);
return vb2_mmap(&vfh->queue, vma);;
}
static struct v4l2_file_operations iss_video_fops = {
.owner = THIS_MODULE,
.unlocked_ioctl = video_ioctl2,
.open = iss_video_open,
.release = iss_video_release,
.poll = iss_video_poll,
.mmap = iss_video_mmap,
};
/* -----------------------------------------------------------------------------
* ISS video core
*/
static const struct iss_video_operations iss_video_dummy_ops = {
};
int omap4iss_video_init(struct iss_video *video, const char *name)
{
const char *direction;
int ret;
switch (video->type) {
case V4L2_BUF_TYPE_VIDEO_CAPTURE:
direction = "output";
video->pad.flags = MEDIA_PAD_FL_SINK;
break;
case V4L2_BUF_TYPE_VIDEO_OUTPUT:
direction = "input";
video->pad.flags = MEDIA_PAD_FL_SOURCE;
break;
default:
return -EINVAL;
}
ret = media_entity_init(&video->video.entity, 1, &video->pad, 0);
if (ret < 0)
return ret;
mutex_init(&video->mutex);
atomic_set(&video->active, 0);
spin_lock_init(&video->pipe.lock);
mutex_init(&video->stream_lock);
/* Initialize the video device. */
if (video->ops == NULL)
video->ops = &iss_video_dummy_ops;
video->video.fops = &iss_video_fops;
snprintf(video->video.name, sizeof(video->video.name),
"OMAP4 ISS %s %s", name, direction);
video->video.vfl_type = VFL_TYPE_GRABBER;
video->video.release = video_device_release_empty;
video->video.ioctl_ops = &iss_video_ioctl_ops;
video->pipe.stream_state = ISS_PIPELINE_STREAM_STOPPED;
video_set_drvdata(&video->video, video);
return 0;
}
void omap4iss_video_cleanup(struct iss_video *video)
{
media_entity_cleanup(&video->video.entity);
mutex_destroy(&video->stream_lock);
mutex_destroy(&video->mutex);
}
int omap4iss_video_register(struct iss_video *video, struct v4l2_device *vdev)
{
int ret;
video->video.v4l2_dev = vdev;
ret = video_register_device(&video->video, VFL_TYPE_GRABBER, -1);
if (ret < 0)
printk(KERN_ERR "%s: could not register video device (%d)\n",
__func__, ret);
return ret;
}
void omap4iss_video_unregister(struct iss_video *video)
{
if (video_is_registered(&video->video))
video_unregister_device(&video->video);
}
/*
* TI OMAP4 ISS V4L2 Driver - Generic video node
*
* Copyright (C) 2012 Texas Instruments, Inc.
*
* Author: Sergio Aguirre <sergio.a.aguirre@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#ifndef OMAP4_ISS_VIDEO_H
#define OMAP4_ISS_VIDEO_H
#include <linux/v4l2-mediabus.h>
#include <media/media-entity.h>
#include <media/v4l2-dev.h>
#include <media/v4l2-fh.h>
#include <media/videobuf2-core.h>
#include <media/videobuf2-dma-contig.h>
#define ISS_VIDEO_DRIVER_NAME "issvideo"
#define ISS_VIDEO_DRIVER_VERSION "0.0.2"
struct iss_device;
struct iss_video;
struct v4l2_mbus_framefmt;
struct v4l2_pix_format;
/*
* struct iss_format_info - ISS media bus format information
* @code: V4L2 media bus format code
* @truncated: V4L2 media bus format code for the same format truncated to 10
* bits. Identical to @code if the format is 10 bits wide or less.
* @uncompressed: V4L2 media bus format code for the corresponding uncompressed
* format. Identical to @code if the format is not DPCM compressed.
* @flavor: V4L2 media bus format code for the same pixel layout but
* shifted to be 8 bits per pixel. =0 if format is not shiftable.
* @pixelformat: V4L2 pixel format FCC identifier
* @bpp: Bits per pixel
*/
struct iss_format_info {
enum v4l2_mbus_pixelcode code;
enum v4l2_mbus_pixelcode truncated;
enum v4l2_mbus_pixelcode uncompressed;
enum v4l2_mbus_pixelcode flavor;
u32 pixelformat;
unsigned int bpp;
};
enum iss_pipeline_stream_state {
ISS_PIPELINE_STREAM_STOPPED = 0,
ISS_PIPELINE_STREAM_CONTINUOUS = 1,
ISS_PIPELINE_STREAM_SINGLESHOT = 2,
};
enum iss_pipeline_state {
/* The stream has been started on the input video node. */
ISS_PIPELINE_STREAM_INPUT = 1,
/* The stream has been started on the output video node. */
ISS_PIPELINE_STREAM_OUTPUT = (1 << 1),
/* At least one buffer is queued on the input video node. */
ISS_PIPELINE_QUEUE_INPUT = (1 << 2),
/* At least one buffer is queued on the output video node. */
ISS_PIPELINE_QUEUE_OUTPUT = (1 << 3),
/* The input entity is idle, ready to be started. */
ISS_PIPELINE_IDLE_INPUT = (1 << 4),
/* The output entity is idle, ready to be started. */
ISS_PIPELINE_IDLE_OUTPUT = (1 << 5),
/* The pipeline is currently streaming. */
ISS_PIPELINE_STREAM = (1 << 6),
};
/*
* struct iss_pipeline - An OMAP4 ISS hardware pipeline
* @error: A hardware error occurred during capture
*/
struct iss_pipeline {
struct media_pipeline pipe;
spinlock_t lock; /* Pipeline state and queue flags */
unsigned int state;
enum iss_pipeline_stream_state stream_state;
struct iss_video *input;
struct iss_video *output;
atomic_t frame_number;
bool do_propagation; /* of frame number */
bool error;
struct v4l2_fract max_timeperframe;
struct v4l2_subdev *external;
unsigned int external_rate;
int external_bpp;
};
#define to_iss_pipeline(__e) \
container_of((__e)->pipe, struct iss_pipeline, pipe)
static inline int iss_pipeline_ready(struct iss_pipeline *pipe)
{
return pipe->state == (ISS_PIPELINE_STREAM_INPUT |
ISS_PIPELINE_STREAM_OUTPUT |
ISS_PIPELINE_QUEUE_INPUT |
ISS_PIPELINE_QUEUE_OUTPUT |
ISS_PIPELINE_IDLE_INPUT |
ISS_PIPELINE_IDLE_OUTPUT);
}
/*
* struct iss_buffer - ISS buffer
* @buffer: ISS video buffer
* @iss_addr: Physical address of the buffer.
*/
struct iss_buffer {
/* common v4l buffer stuff -- must be first */
struct vb2_buffer vb;
struct list_head list;
dma_addr_t iss_addr;
};
#define to_iss_buffer(buf) container_of(buf, struct iss_buffer, buffer)
enum iss_video_dmaqueue_flags {
/* Set if DMA queue becomes empty when ISS_PIPELINE_STREAM_CONTINUOUS */
ISS_VIDEO_DMAQUEUE_UNDERRUN = (1 << 0),
/* Set when queuing buffer to an empty DMA queue */
ISS_VIDEO_DMAQUEUE_QUEUED = (1 << 1),
};
#define iss_video_dmaqueue_flags_clr(video) \
({ (video)->dmaqueue_flags = 0; })
/*
* struct iss_video_operations - ISS video operations
* @queue: Resume streaming when a buffer is queued. Called on VIDIOC_QBUF
* if there was no buffer previously queued.
*/
struct iss_video_operations {
int(*queue)(struct iss_video *video, struct iss_buffer *buffer);
};
struct iss_video {
struct video_device video;
enum v4l2_buf_type type;
struct media_pad pad;
struct mutex mutex; /* format and crop settings */
atomic_t active;
struct iss_device *iss;
unsigned int capture_mem;
unsigned int bpl_alignment; /* alignment value */
unsigned int bpl_zero_padding; /* whether the alignment is optional */
unsigned int bpl_max; /* maximum bytes per line value */
unsigned int bpl_value; /* bytes per line value */
unsigned int bpl_padding; /* padding at end of line */
/* Entity video node streaming */
unsigned int streaming:1;
/* Pipeline state */
struct iss_pipeline pipe;
struct mutex stream_lock; /* pipeline and stream states */
/* Video buffers queue */
struct vb2_queue *queue;
spinlock_t qlock; /* Spinlock for dmaqueue */
struct list_head dmaqueue;
enum iss_video_dmaqueue_flags dmaqueue_flags;
struct vb2_alloc_ctx *alloc_ctx;
const struct iss_video_operations *ops;
};
#define to_iss_video(vdev) container_of(vdev, struct iss_video, video)
struct iss_video_fh {
struct v4l2_fh vfh;
struct iss_video *video;
struct vb2_queue queue;
struct v4l2_format format;
struct v4l2_fract timeperframe;
};
#define to_iss_video_fh(fh) container_of(fh, struct iss_video_fh, vfh)
#define iss_video_queue_to_iss_video_fh(q) \
container_of(q, struct iss_video_fh, queue)
int omap4iss_video_init(struct iss_video *video, const char *name);
void omap4iss_video_cleanup(struct iss_video *video);
int omap4iss_video_register(struct iss_video *video,
struct v4l2_device *vdev);
void omap4iss_video_unregister(struct iss_video *video);
struct iss_buffer *omap4iss_video_buffer_next(struct iss_video *video);
struct media_pad *omap4iss_video_remote_pad(struct iss_video *video);
const struct iss_format_info *
omap4iss_video_format_info(enum v4l2_mbus_pixelcode code);
#endif /* OMAP4_ISS_VIDEO_H */
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment