// SPDX-License-Identifier: GPL-2.0-or-later
/*
* STK1160 driver
*
* Copyright (C) 2012 Ezequiel Garcia
* <elezegarcia--a.t--gmail.com>
*
* Based on Easycap driver by R.M. Thomas
* Copyright (C) 2010 R.M. Thomas
* <rmthomas--a.t--sciolus.org>
*/
#include <linux/module.h>
#include <linux/usb.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/videodev2.h>
#include <media/v4l2-device.h>
#include <media/v4l2-common.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-fh.h>
#include <media/v4l2-event.h>
#include <media/videobuf2-vmalloc.h>
#include <media/i2c/saa7115.h>
#include "stk1160.h"
#include "stk1160-reg.h"
static bool keep_buffers;
module_param(keep_buffers, bool, 0644);
MODULE_PARM_DESC(keep_buffers, "don't release buffers upon stop streaming");
enum stk1160_decimate_mode {
STK1160_DECIMATE_MORE_THAN_HALF,
STK1160_DECIMATE_LESS_THAN_HALF,
};
struct stk1160_decimate_ctrl {
bool col_en, row_en;
enum stk1160_decimate_mode col_mode, row_mode;
unsigned int col_n, row_n;
};
/* supported video standards */
static struct stk1160_fmt format[] = {
{
.name = "16 bpp YUY2, 4:2:2, packed",
.fourcc = V4L2_PIX_FMT_UYVY,
.depth = 16,
}
};
/*
* Helper to find the next divisor that results in modulo being zero.
* This is required to guarantee valid decimation unit counts.
*/
static unsigned int
div_round_integer(unsigned int x, unsigned int y)
{
for (;; y++) {
if (x % y == 0)
return x / y;
}
}
static void stk1160_set_std(struct stk1160 *dev)
{
int i;
static struct regval std525[] = {
/* 720x480 */
/* Frame start */
{STK116_CFSPO_STX_L, 0x0000},
{STK116_CFSPO_STX_H, 0x0000},
{STK116_CFSPO_STY_L, 0x0003},
{STK116_CFSPO_STY_H, 0x0000},
/* Frame end */
{STK116_CFEPO_ENX_L, 0x05a0},
{STK116_CFEPO_ENX_H, 0x0005},
{STK116_CFEPO_ENY_L, 0x00f3},
{STK116_CFEPO_ENY_H, 0x0000},
{0xffff, 0xffff}
};
static struct regval std625[] = {
/* 720x576 */
/* TODO: Each line of frame has some junk at the end */
/* Frame start */
{STK116_CFSPO, 0x0000},
{STK116_CFSPO+1, 0x0000},
{STK116_CFSPO+2, 0x0001},
{STK116_CFSPO+3, 0x0000},
/* Frame end */
{STK116_CFEPO, 0x05a0},
{STK116_CFEPO+1, 0x0005},
{STK116_CFEPO+2, 0x0121},
{STK116_CFEPO+3, 0x0001},
{0xffff, 0xffff}
};
if (dev->norm & V4L2_STD_525_60) {
stk1160_dbg("registers to NTSC like standard\n");
for (i = 0; std525[i].reg != 0xffff; i++)
stk1160_write_reg(dev, std525[i].reg, std525[i].val);
} else {
stk1160_dbg("registers to PAL like standard\n");
for (i = 0; std625[i].reg != 0xffff; i++)
stk1160_write_reg(dev, std625[i].reg, std625[i].val);
}
}
static void stk1160_set_fmt(struct stk1160 *dev,
struct stk1160_decimate_ctrl *ctrl)
{
u32 val = 0;
if (ctrl) {
/*
* Since the format is UYVY, the device must skip or send
* a number of rows/columns multiple of four. This way, the
* colour format is preserved. The STK1160_DEC_UNIT_SIZE bit
* does exactly this.
*/
val |= STK1160_DEC_UNIT_SIZE;
val |= ctrl->col_en ? STK1160_H_DEC_EN : 0;
val |= ctrl->row_en ? STK1160_V_DEC_EN : 0;
val |= ctrl->col_mode ==
STK1160_DECIMATE_MORE_THAN_HALF ?
STK1160_H_DEC_MODE : 0;
val |= ctrl->row_mode ==
STK1160_DECIMATE_MORE_THAN_HALF ?
STK1160_V_DEC_MODE : 0;
/* Horizontal count units */
stk1160_write_reg(dev, STK1160_DMCTRL_H_UNITS, ctrl->col_n);
/* Vertical count units */
stk1160_write_reg(dev, STK1160_DMCTRL_V_UNITS, ctrl->row_n);
stk1160_dbg("decimate 0x%x, column units %d, row units %d\n",
val, ctrl->col_n, ctrl->row_n);
}
/* Decimation control */
stk1160_write_reg(dev, STK1160_DMCTRL, val);
}
/*
* Set a new alternate setting.
* Returns true is dev->max_pkt_size has changed, false otherwise.
*/
static bool stk1160_set_alternate(struct stk1160 *dev)
{
int i, prev_alt = dev->alt;
unsigned int min_pkt_size;
bool new_pkt_size;
/*
* If we don't set right alternate,
* then we will get a green screen with junk.
*/
min_pkt_size = STK1160_MIN_PKT_SIZE;
for (i = 0; i < dev->num_alt; i++) {
/* stop when the selected alt setting offers enough bandwidth */
if (dev->alt_max_pkt_size[i] >= min_pkt_size) {
dev->alt = i;
break;
/*
* otherwise make sure that we end up with the maximum bandwidth
* because the min_pkt_size equation might be wrong...
*/
} else if (dev->alt_max_pkt_size[i] >
dev->alt_max_pkt_size[dev->alt])
dev->alt = i;
}
stk1160_dbg("setting alternate %d\n", dev->alt);
if (dev->alt != prev_alt) {
stk1160_dbg("minimum isoc packet size: %u (alt=%d)\n",
min_pkt_size, dev->alt);
stk1160_dbg("setting alt %d with wMaxPacketSize=%u\n",
dev->alt, dev->alt_max_pkt_size[dev->alt]);
usb_set_interface(dev->udev, 0, dev->alt);
}
new_pkt_size = dev->max_pkt_size != dev->alt_max_pkt_size[dev->alt];
dev->max_pkt_size = dev->alt_max_pkt_size[dev->alt];
return new_pkt_size;
}
static int stk1160_start_streaming(struct stk1160 *dev)
{
bool new_pkt_size;
int rc = 0;
int i;
/* Check device presence */
if (!dev->udev)
return -ENODEV;
if (mutex_lock_interruptible(&dev->v4l_lock))
return -ERESTARTSYS;
/*
* For some reason it is mandatory to set alternate *first*
* and only *then* initialize isoc urbs.
* Someone please explain me why ;)
*/
new_pkt_size = stk1160_set_alternate(dev);
/*
* We (re)allocate isoc urbs if:
* there is no allocated isoc urbs, OR
* a new dev->max_pkt_size is detected
*/
if (!dev->isoc_ctl.num_bufs || new_pkt_size) {
rc = stk1160_alloc_isoc(dev);
if (rc < 0)
goto out_stop_hw;
}
/* submit urbs and enables IRQ */
for (i = 0; i < dev->isoc_ctl.num_bufs; i++) {
rc = usb_submit_urb(dev->isoc_ctl.urb[i], GFP_KERNEL);
if (rc) {
stk1160_err("cannot submit urb[%d] (%d)\n", i, rc);
goto out_uninit;
}
}
/* Start saa711x */
v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 1);
dev->sequence = 0;
/* Start stk1160 */
stk1160_write_reg(dev, STK1160_DCTRL, 0xb3);
stk1160_write_reg(dev, STK1160_DCTRL+3, 0x00);
stk1160_dbg("streaming started\n");
mutex_unlock(&dev->v4l_lock);
return 0;
out_uninit:
stk1160_uninit_isoc(dev);
out_stop_hw:
usb_set_interface(dev->udev, 0, 0);
stk1160_clear_queue(dev);
mutex_unlock(&dev->v4l_lock);
return rc;
}
/* Must be called with v4l_lock hold */
static void stk1160_stop_hw(struct stk1160 *dev)
{
/* If the device is not physically present, there is nothing to do */
if (!dev->udev)
return;
/* set alternate 0 */
dev->alt = 0;
stk1160_dbg("setting alternate %d\n", dev->alt);
usb_set_interface(dev->udev, 0, 0);
/* Stop stk1160 */
stk1160_write_reg(dev, STK1160_DCTRL, 0x00);
stk1160_write_reg(dev, STK1160_DCTRL+3, 0x00);
/* Stop saa711x */
v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 0);
}
static int stk1160_stop_streaming(struct stk1160 *dev)
{
if (mutex_lock_interruptible(&dev->v4l_lock))
return -ERESTARTSYS;
/*
* Once URBs are cancelled, the URB complete handler
* won't be running. This is required to safely release the
* current buffer (dev->isoc_ctl.buf).
*/
stk1160_cancel_isoc(dev);
/*
* It is possible to keep buffers around using a module parameter.
* This is intended to avoid memory fragmentation.
*/
if (!keep_buffers)
stk1160_free_isoc(dev);
stk1160_stop_hw(dev);
stk1160_clear_queue(dev);
stk1160_dbg("streaming stopped\n");
mutex_unlock(&dev->v4l_lock);
return 0;
}
static const struct v4l2_file_operations stk1160_fops = {
.owner = THIS_MODULE,
.open = v4l2_fh_open,
.release = vb2_fop_release,
.read = vb2_fop_read,
.poll = vb2_fop_poll,
.mmap = vb2_fop_mmap,
.unlocked_ioctl = video_ioctl2,
};
/*
* vidioc ioctls
*/
static int vidioc_querycap(struct file *file,
void *priv, struct v4l2_capability *cap)
{
struct stk1160 *dev = video_drvdata(file);
strscpy(cap->driver, "stk1160", sizeof(cap->driver));
strscpy(cap->card, "stk1160", sizeof(cap->card));
usb_make_path(dev->udev, cap->bus_info, sizeof(cap->bus_info));
cap->device_caps =
V4L2_CAP_VIDEO_CAPTURE |
V4L2_CAP_STREAMING |
V4L2_CAP_READWRITE;
cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
return 0;
}
static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
struct v4l2_fmtdesc *f)
{
if (f->index != 0)
return -EINVAL;
strscpy(f->description, format[f->index].name, sizeof(f->description));
f->pixelformat = format[f->index].fourcc;
return 0;
}
static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
struct v4l2_format *f)
{
struct stk1160 *dev = video_drvdata(file);
f->fmt.pix.width = dev->width;
f->fmt.pix.height = dev->height;
f->fmt.pix.field = V4L2_FIELD_INTERLACED;
f->fmt.pix.pixelformat = dev->fmt->fourcc;
f->fmt.pix.bytesperline = dev->width * 2;
f->fmt.pix.sizeimage = dev->height * f->fmt.pix.bytesperline;
f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
return 0;
}
static int stk1160_try_fmt(struct stk1160 *dev, struct v4l2_format *f,
struct stk1160_decimate_ctrl *ctrl)
{
unsigned int width, height;
unsigned int base_width, base_height;
unsigned int col_n, row_n;
enum stk1160_decimate_mode col_mode, row_mode;
bool col_en, row_en;
base_width = 720;
base_height = (dev->norm & V4L2_STD_525_60) ? 480 : 576;
/* Minimum width and height is 5% the frame size */
width = clamp_t(unsigned int, f->fmt.pix.width,
base_width / 20, base_width);
height = clamp_t(unsigned int, f->fmt.pix.height,
base_height / 20, base_height);
/* Let's set default no decimation values */
col_n = 0;
row_n = 0;
col_en = false;
row_en = false;
f->fmt.pix.width = base_width;
f->fmt.pix.height = base_height;
row_mode = STK1160_DECIMATE_LESS_THAN_HALF;
col_mode = STK1160_DECIMATE_LESS_THAN_HALF;
if (width < base_width && width > base_width / 2) {
/*
* The device will send count units for each
* unit skipped. This means count unit is:
*
* n = width / (frame width - width)
*
* And the width is:
*
* width = (n / n + 1) * frame width
*/
col_n = div_round_integer(width, base_width - width);
if (col_n > 0 && col_n <= 255) {
col_en = true;
col_mode = STK1160_DECIMATE_LESS_THAN_HALF;
f->fmt.pix.width = (base_width * col_n) / (col_n + 1);
}
} else if (width <= base_width / 2) {
/*
* The device will skip count units for each
* unit sent. This means count is:
*
* n = (frame width / width) - 1
*
* And the width is:
*
* width = frame width / (n + 1)
*/
col_n = div_round_integer(base_width, width) - 1;
if (col_n > 0 && col_n <= 255) {
col_en = true;
col_mode = STK1160_DECIMATE_MORE_THAN_HALF;
f->fmt.pix.width = base_width / (col_n + 1);
}
}
if (height < base_height && height > base_height / 2) {
row_n = div_round_integer(height, base_height - height);
if (row_n > 0 && row_n <= 255) {
row_en = true;
row_mode = STK1160_DECIMATE_LESS_THAN_HALF;
f->fmt.pix.height = (base_height * row_n) / (row_n + 1);
}
} else if (height <= base_height / 2) {
row_n = div_round_integer(base_height, height) - 1;
if (row_n > 0 && row_n <= 255) {
row_en = true;
row_mode = STK1160_DECIMATE_MORE_THAN_HALF;
f->fmt.pix.height = base_height / (row_n + 1);
}
}
f->fmt.pix.pixelformat = dev->fmt->fourcc;
f->fmt.pix.field = V4L2_FIELD_INTERLACED;
f->fmt.pix.bytesperline = f->fmt.pix.width * 2;
f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline;
f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
if (ctrl) {
ctrl->col_en = col_en;
ctrl->col_n = col_n;
ctrl->col_mode = col_mode;
ctrl->row_en = row_en;
ctrl->row_n = row_n;
ctrl->row_mode = row_mode;
}
stk1160_dbg("width %d, height %d\n",
f->fmt.pix.width, f->fmt.pix.height);
return 0;
}
static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
struct v4l2_format *f)
{
struct stk1160 *dev = video_drvdata(file);
return stk1160_try_fmt(dev, f, NULL);
}
static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
struct v4l2_format *f)
{
struct stk1160 *dev = video_drvdata(file);
struct vb2_queue *q = &dev->vb_vidq;
struct stk1160_decimate_ctrl ctrl;
int rc;
if (vb2_is_busy(q))
return -EBUSY;
rc = stk1160_try_fmt(dev, f, &ctrl);
if (rc < 0)
return rc;
dev->width = f->fmt.pix.width;
dev->height = f->fmt.pix.height;
stk1160_set_fmt(dev, &ctrl);
return 0;
}
static int vidioc_querystd(struct file *file, void *priv, v4l2_std_id *norm)
{
struct stk1160 *dev = video_drvdata(file);
v4l2_device_call_all(&dev->v4l2_dev, 0, video, querystd, norm);
return 0;
}
static int vidioc_g_std(struct file *file, void *priv, v4l2_std_id *norm)
{
struct stk1160 *dev = video_drvdata(file);
*norm = dev->norm;
return 0;
}
static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id norm)
{
struct stk1160 *dev = video_drvdata(file);
struct vb2_queue *q = &dev->vb_vidq;
if (dev->norm == norm)
return 0;
if (vb2_is_busy(q))
return -EBUSY;
/* Check device presence */
if (!dev->udev)
return -ENODEV;
/* We need to set this now, before we call stk1160_set_std */
dev->width = 720;
dev->height = (norm & V4L2_STD_525_60) ? 480 : 576;
dev->norm = norm;
stk1160_set_std(dev);
/* Calling with NULL disables frame decimation */
stk1160_set_fmt(dev, NULL);
v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_std,
dev->norm);
return 0;
}
static int vidioc_enum_input(struct file *file, void *priv,
struct v4l2_input *i)
{
struct stk1160 *dev = video_drvdata(file);
if (i->index > STK1160_MAX_INPUT)
return -EINVAL;
/* S-Video special handling */
if (i->index == STK1160_SVIDEO_INPUT)
sprintf(i->name, "S-Video");
else
sprintf(i->name, "Composite%d", i->index);
i->type = V4L2_INPUT_TYPE_CAMERA;
i->std = dev->vdev.tvnorms;
return 0;
}
static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
{
struct stk1160 *dev = video_drvdata(file);
*i = dev->ctl_input;
return 0;
}
static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
{
struct stk1160 *dev = video_drvdata(file);
if (i > STK1160_MAX_INPUT)
return -EINVAL;
dev->ctl_input = i;
stk1160_select_input(dev);
return 0;
}
#ifdef CONFIG_VIDEO_ADV_DEBUG
static int vidioc_g_register(struct file *file, void *priv,
struct v4l2_dbg_register *reg)
{
struct stk1160 *dev = video_drvdata(file);
int rc;
u8 val;
/* Match host */
rc = stk1160_read_reg(dev, reg->reg, &val);
reg->val = val;
reg->size = 1;
return rc;
}
static int vidioc_s_register(struct file *file, void *priv,
const struct v4l2_dbg_register *reg)
{
struct stk1160 *dev = video_drvdata(file);
/* Match host */
return stk1160_write_reg(dev, reg->reg, reg->val);
}
#endif
static const struct v4l2_ioctl_ops stk1160_ioctl_ops = {
.vidioc_querycap = vidioc_querycap,
.vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
.vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
.vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
.vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
.vidioc_querystd = vidioc_querystd,
.vidioc_g_std = vidioc_g_std,
.vidioc_s_std = vidioc_s_std,
.vidioc_enum_input = vidioc_enum_input,
.vidioc_g_input = vidioc_g_input,
.vidioc_s_input = vidioc_s_input,
/* vb2 takes care of these */
.vidioc_reqbufs = vb2_ioctl_reqbufs,
.vidioc_querybuf = vb2_ioctl_querybuf,
.vidioc_qbuf = vb2_ioctl_qbuf,
.vidioc_dqbuf = vb2_ioctl_dqbuf,
.vidioc_streamon = vb2_ioctl_streamon,
.vidioc_streamoff = vb2_ioctl_streamoff,
.vidioc_expbuf = vb2_ioctl_expbuf,
.vidioc_log_status = v4l2_ctrl_log_status,
.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
#ifdef CONFIG_VIDEO_ADV_DEBUG
.vidioc_g_register = vidioc_g_register,
.vidioc_s_register = vidioc_s_register,
#endif
};
/********************************************************************/
/*
* Videobuf2 operations
*/
static int queue_setup(struct vb2_queue *vq,
unsigned int *nbuffers, unsigned int *nplanes,
unsigned int sizes[], struct device *alloc_devs[])
{
struct stk1160 *dev = vb2_get_drv_priv(vq);
unsigned long size;
size = dev->width * dev->height * 2;
/*
* Here we can change the number of buffers being requested.
* So, we set a minimum and a maximum like this:
*/
*nbuffers = clamp_t(unsigned int, *nbuffers,
STK1160_MIN_VIDEO_BUFFERS, STK1160_MAX_VIDEO_BUFFERS);
if (*nplanes)
return sizes[0] < size ? -EINVAL : 0;
/* This means a packed colorformat */
*nplanes = 1;
sizes[0] = size;
stk1160_dbg("%s: buffer count %d, each %ld bytes\n",
__func__, *nbuffers, size);
return 0;
}
static void buffer_queue(struct vb2_buffer *vb)
{
unsigned long flags;
struct stk1160 *dev = vb2_get_drv_priv(vb->vb2_queue);
struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
struct stk1160_buffer *buf =
container_of(vbuf, struct stk1160_buffer, vb);
spin_lock_irqsave(&dev->buf_lock, flags);
if (!dev->udev) {
/*
* If the device is disconnected return the buffer to userspace
* directly. The next QBUF call will fail with -ENODEV.
*/
vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
} else {
buf->mem = vb2_plane_vaddr(vb, 0);
buf->length = vb2_plane_size(vb, 0);
buf->bytesused = 0;
buf->pos = 0;
/*
* If buffer length is less from expected then we return
* the buffer to userspace directly.
*/
if (buf->length < dev->width * dev->height * 2)
vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
else
list_add_tail(&buf->list, &dev->avail_bufs);
}
spin_unlock_irqrestore(&dev->buf_lock, flags);
}
static int start_streaming(struct vb2_queue *vq, unsigned int count)
{
struct stk1160 *dev = vb2_get_drv_priv(vq);
return stk1160_start_streaming(dev);
}
/* abort streaming and wait for last buffer */
static void stop_streaming(struct vb2_queue *vq)
{
struct stk1160 *dev = vb2_get_drv_priv(vq);
stk1160_stop_streaming(dev);
}
static const struct vb2_ops stk1160_video_qops = {
.queue_setup = queue_setup,
.buf_queue = buffer_queue,
.start_streaming = start_streaming,
.stop_streaming = stop_streaming,
.wait_prepare = vb2_ops_wait_prepare,
.wait_finish = vb2_ops_wait_finish,
};
static const struct video_device v4l_template = {
.name = "stk1160",
.tvnorms = V4L2_STD_525_60 | V4L2_STD_625_50,
.fops = &stk1160_fops,
.ioctl_ops = &stk1160_ioctl_ops,
.release = video_device_release_empty,
};
/********************************************************************/
/* Must be called with both v4l_lock and vb_queue_lock hold */
void stk1160_clear_queue(struct stk1160 *dev)
{
struct stk1160_buffer *buf;
unsigned long flags;
/* Release all active buffers */
spin_lock_irqsave(&dev->buf_lock, flags);
while (!list_empty(&dev->avail_bufs)) {
buf = list_first_entry(&dev->avail_bufs,
struct stk1160_buffer, list);
list_del(&buf->list);
vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
stk1160_dbg("buffer [%p/%d] aborted\n",
buf, buf->vb.vb2_buf.index);
}
/* It's important to release the current buffer */
if (dev->isoc_ctl.buf) {
buf = dev->isoc_ctl.buf;
dev->isoc_ctl.buf = NULL;
vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
stk1160_dbg("buffer [%p/%d] aborted\n",
buf, buf->vb.vb2_buf.index);
}
spin_unlock_irqrestore(&dev->buf_lock, flags);
}
int stk1160_vb2_setup(struct stk1160 *dev)
{
int rc;
struct vb2_queue *q;
q = &dev->vb_vidq;
q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
q->io_modes = VB2_READ | VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
q->drv_priv = dev;
q->buf_struct_size = sizeof(struct stk1160_buffer);
q->ops = &stk1160_video_qops;
q->mem_ops = &vb2_vmalloc_memops;
q->lock = &dev->vb_queue_lock;
q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
rc = vb2_queue_init(q);
if (rc < 0)
return rc;
/* initialize video dma queue */
INIT_LIST_HEAD(&dev->avail_bufs);
return 0;
}
int stk1160_video_register(struct stk1160 *dev)
{
int rc;
/* Initialize video_device with a template structure */
dev->vdev = v4l_template;
dev->vdev.queue = &dev->vb_vidq;
/*
* Provide mutexes for v4l2 core and for videobuf2 queue.
* It will be used to protect *only* v4l2 ioctls.
*/
dev->vdev.lock = &dev->v4l_lock;
/* This will be used to set video_device parent */
dev->vdev.v4l2_dev = &dev->v4l2_dev;
/* NTSC is default */
dev->norm = V4L2_STD_NTSC_M;
dev->width = 720;
dev->height = 480;
/* set default format */
dev->fmt = &format[0];
stk1160_set_std(dev);
v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_std,
dev->norm);
video_set_drvdata(&dev->vdev, dev);
rc = video_register_device(&dev->vdev, VFL_TYPE_GRABBER, -1);
if (rc < 0) {
stk1160_err("video_register_device failed (%d)\n", rc);
return rc;
}
v4l2_info(&dev->v4l2_dev, "V4L2 device registered as %s\n",
video_device_node_name(&dev->vdev));
return 0;
}
