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linux-stable/drivers/media/video/stk-webcam.c
Hans Verkuil d56dc61265 V4L/DVB (8613): v4l: move BKL down to the driver level. 
The BKL is now moved from the video_open function in v4l2-dev.c to the
various drivers. It seems about a third of the drivers already has a
lock of some sort protecting the open(), another third uses
video_exclusive_open (yuck!) and the last third required adding the
BKL in their open function.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2008-10-12 09:36:47 -02:00

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/*
* stk-webcam.c : Driver for Syntek 1125 USB webcam controller
*
* Copyright (C) 2006 Nicolas VIVIEN
* Copyright 2007-2008 Jaime Velasco Juan <jsagarribay@gmail.com>
*
* Some parts are inspired from cafe_ccic.c
* Copyright 2006-2007 Jonathan Corbet
*
* 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
* any later version.
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/kref.h>
#include <linux/usb.h>
#include <linux/mm.h>
#include <linux/vmalloc.h>
#include <linux/videodev2.h>
#include <media/v4l2-common.h>
#include <media/v4l2-ioctl.h>
#include "stk-webcam.h"
static int hflip = 1;
module_param(hflip, bool, 0444);
MODULE_PARM_DESC(hflip, "Horizontal image flip (mirror). Defaults to 1");
static int vflip = 1;
module_param(vflip, bool, 0444);
MODULE_PARM_DESC(vflip, "Vertical image flip. Defaults to 1");
static int debug;
module_param(debug, int, 0444);
MODULE_PARM_DESC(debug, "Debug v4l ioctls. Defaults to 0");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jaime Velasco Juan <jsagarribay@gmail.com> and Nicolas VIVIEN");
MODULE_DESCRIPTION("Syntek DC1125 webcam driver");
/* Some cameras have audio interfaces, we aren't interested in those */
static struct usb_device_id stkwebcam_table[] = {
{ USB_DEVICE_AND_INTERFACE_INFO(0x174f, 0xa311, 0xff, 0xff, 0xff) },
{ USB_DEVICE_AND_INTERFACE_INFO(0x05e1, 0x0501, 0xff, 0xff, 0xff) },
{ }
};
MODULE_DEVICE_TABLE(usb, stkwebcam_table);
static void stk_camera_cleanup(struct kref *kref)
{
struct stk_camera *dev = to_stk_camera(kref);
STK_INFO("Syntek USB2.0 Camera release resources"
" video device /dev/video%d\n", dev->vdev.minor);
video_unregister_device(&dev->vdev);
dev->vdev.priv = NULL;
if (dev->sio_bufs != NULL || dev->isobufs != NULL)
STK_ERROR("We are leaking memory\n");
usb_put_intf(dev->interface);
kfree(dev);
}
/*
* Basic stuff
*/
int stk_camera_write_reg(struct stk_camera *dev, u16 index, u8 value)
{
struct usb_device *udev = dev->udev;
int ret;
ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
0x01,
USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
value,
index,
NULL,
0,
500);
if (ret < 0)
return ret;
else
return 0;
}
int stk_camera_read_reg(struct stk_camera *dev, u16 index, int *value)
{
struct usb_device *udev = dev->udev;
int ret;
ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
0x00,
USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
0x00,
index,
(u8 *) value,
sizeof(u8),
500);
if (ret < 0)
return ret;
else
return 0;
}
static int stk_start_stream(struct stk_camera *dev)
{
int value;
int i, ret;
int value_116, value_117;
if (!is_present(dev))
return -ENODEV;
if (!is_memallocd(dev) || !is_initialised(dev)) {
STK_ERROR("FIXME: Buffers are not allocated\n");
return -EFAULT;
}
ret = usb_set_interface(dev->udev, 0, 5);
if (ret < 0)
STK_ERROR("usb_set_interface failed !\n");
if (stk_sensor_wakeup(dev))
STK_ERROR("error awaking the sensor\n");
stk_camera_read_reg(dev, 0x0116, &value_116);
stk_camera_read_reg(dev, 0x0117, &value_117);
stk_camera_write_reg(dev, 0x0116, 0x0000);
stk_camera_write_reg(dev, 0x0117, 0x0000);
stk_camera_read_reg(dev, 0x0100, &value);
stk_camera_write_reg(dev, 0x0100, value | 0x80);
stk_camera_write_reg(dev, 0x0116, value_116);
stk_camera_write_reg(dev, 0x0117, value_117);
for (i = 0; i < MAX_ISO_BUFS; i++) {
if (dev->isobufs[i].urb) {
ret = usb_submit_urb(dev->isobufs[i].urb, GFP_KERNEL);
atomic_inc(&dev->urbs_used);
if (ret)
return ret;
}
}
set_streaming(dev);
return 0;
}
static int stk_stop_stream(struct stk_camera *dev)
{
int value;
int i;
if (is_present(dev)) {
stk_camera_read_reg(dev, 0x0100, &value);
stk_camera_write_reg(dev, 0x0100, value & ~0x80);
if (dev->isobufs != NULL) {
for (i = 0; i < MAX_ISO_BUFS; i++) {
if (dev->isobufs[i].urb)
usb_kill_urb(dev->isobufs[i].urb);
}
}
unset_streaming(dev);
if (usb_set_interface(dev->udev, 0, 0))
STK_ERROR("usb_set_interface failed !\n");
if (stk_sensor_sleep(dev))
STK_ERROR("error suspending the sensor\n");
}
return 0;
}
/*
* This seems to be the shortest init sequence we
* must do in order to find the sensor
* Bit 5 of reg. 0x0000 here is important, when reset to 0 the sensor
* is also reset. Maybe powers down it?
* Rest of values don't make a difference
*/
static struct regval stk1125_initvals[] = {
/*TODO: What means this sequence? */
{0x0000, 0x24},
{0x0100, 0x21},
{0x0002, 0x68},
{0x0003, 0x80},
{0x0005, 0x00},
{0x0007, 0x03},
{0x000d, 0x00},
{0x000f, 0x02},
{0x0300, 0x12},
{0x0350, 0x41},
{0x0351, 0x00},
{0x0352, 0x00},
{0x0353, 0x00},
{0x0018, 0x10},
{0x0019, 0x00},
{0x001b, 0x0e},
{0x001c, 0x46},
{0x0300, 0x80},
{0x001a, 0x04},
{0x0110, 0x00},
{0x0111, 0x00},
{0x0112, 0x00},
{0x0113, 0x00},
{0xffff, 0xff},
};
static int stk_initialise(struct stk_camera *dev)
{
struct regval *rv;
int ret;
if (!is_present(dev))
return -ENODEV;
if (is_initialised(dev))
return 0;
rv = stk1125_initvals;
while (rv->reg != 0xffff) {
ret = stk_camera_write_reg(dev, rv->reg, rv->val);
if (ret)
return ret;
rv++;
}
if (stk_sensor_init(dev) == 0) {
set_initialised(dev);
return 0;
} else
return -1;
}
#ifdef CONFIG_VIDEO_V4L1_COMPAT
/* sysfs functions */
/*FIXME cleanup this */
static ssize_t show_brightness(struct device *class,
struct device_attribute *attr, char *buf)
{
struct video_device *vdev = to_video_device(class);
struct stk_camera *dev = vdev_to_camera(vdev);
return sprintf(buf, "%X\n", dev->vsettings.brightness);
}
static ssize_t store_brightness(struct device *class,
struct device_attribute *attr, const char *buf, size_t count)
{
char *endp;
unsigned long value;
int ret;
struct video_device *vdev = to_video_device(class);
struct stk_camera *dev = vdev_to_camera(vdev);
value = simple_strtoul(buf, &endp, 16);
dev->vsettings.brightness = (int) value;
ret = stk_sensor_set_brightness(dev, value >> 8);
if (ret)
return ret;
else
return count;
}
static ssize_t show_hflip(struct device *class,
struct device_attribute *attr, char *buf)
{
struct video_device *vdev = to_video_device(class);
struct stk_camera *dev = vdev_to_camera(vdev);
return sprintf(buf, "%d\n", dev->vsettings.hflip);
}
static ssize_t store_hflip(struct device *class,
struct device_attribute *attr, const char *buf, size_t count)
{
struct video_device *vdev = to_video_device(class);
struct stk_camera *dev = vdev_to_camera(vdev);
if (strncmp(buf, "1", 1) == 0)
dev->vsettings.hflip = 1;
else if (strncmp(buf, "0", 1) == 0)
dev->vsettings.hflip = 0;
else
return -EINVAL;
return strlen(buf);
}
static ssize_t show_vflip(struct device *class,
struct device_attribute *attr, char *buf)
{
struct video_device *vdev = to_video_device(class);
struct stk_camera *dev = vdev_to_camera(vdev);
return sprintf(buf, "%d\n", dev->vsettings.vflip);
}
static ssize_t store_vflip(struct device *class,
struct device_attribute *attr, const char *buf, size_t count)
{
struct video_device *vdev = to_video_device(class);
struct stk_camera *dev = vdev_to_camera(vdev);
if (strncmp(buf, "1", 1) == 0)
dev->vsettings.vflip = 1;
else if (strncmp(buf, "0", 1) == 0)
dev->vsettings.vflip = 0;
else
return -EINVAL;
return strlen(buf);
}
static DEVICE_ATTR(brightness, S_IRUGO | S_IWUGO,
show_brightness, store_brightness);
static DEVICE_ATTR(hflip, S_IRUGO | S_IWUGO, show_hflip, store_hflip);
static DEVICE_ATTR(vflip, S_IRUGO | S_IWUGO, show_vflip, store_vflip);
static int stk_create_sysfs_files(struct video_device *vdev)
{
int ret;
ret = device_create_file(&vdev->dev, &dev_attr_brightness);
ret += device_create_file(&vdev->dev, &dev_attr_hflip);
ret += device_create_file(&vdev->dev, &dev_attr_vflip);
if (ret)
STK_WARNING("Could not create sysfs files\n");
return ret;
}
static void stk_remove_sysfs_files(struct video_device *vdev)
{
device_remove_file(&vdev->dev, &dev_attr_brightness);
device_remove_file(&vdev->dev, &dev_attr_hflip);
device_remove_file(&vdev->dev, &dev_attr_vflip);
}
#else
#define stk_create_sysfs_files(a)
#define stk_remove_sysfs_files(a)
#endif
/* *********************************************** */
/*
* This function is called as an URB transfert is complete (Isochronous pipe).
* So, the traitement is done in interrupt time, so it has be fast, not crash,
* and not stall. Neat.
*/
static void stk_isoc_handler(struct urb *urb)
{
int i;
int ret;
int framelen;
unsigned long flags;
unsigned char *fill = NULL;
unsigned char *iso_buf = NULL;
struct stk_camera *dev;
struct stk_sio_buffer *fb;
dev = (struct stk_camera *) urb->context;
if (dev == NULL) {
STK_ERROR("isoc_handler called with NULL device !\n");
return;
}
if (urb->status == -ENOENT || urb->status == -ECONNRESET
|| urb->status == -ESHUTDOWN) {
atomic_dec(&dev->urbs_used);
return;
}
spin_lock_irqsave(&dev->spinlock, flags);
if (urb->status != -EINPROGRESS && urb->status != 0) {
STK_ERROR("isoc_handler: urb->status == %d\n", urb->status);
goto resubmit;
}
if (list_empty(&dev->sio_avail)) {
/*FIXME Stop streaming after a while */
(void) (printk_ratelimit() &&
STK_ERROR("isoc_handler without available buffer!\n"));
goto resubmit;
}
fb = list_first_entry(&dev->sio_avail,
struct stk_sio_buffer, list);
fill = fb->buffer + fb->v4lbuf.bytesused;
for (i = 0; i < urb->number_of_packets; i++) {
if (urb->iso_frame_desc[i].status != 0) {
if (urb->iso_frame_desc[i].status != -EXDEV)
STK_ERROR("Frame %d has error %d\n", i,
urb->iso_frame_desc[i].status);
continue;
}
framelen = urb->iso_frame_desc[i].actual_length;
iso_buf = urb->transfer_buffer + urb->iso_frame_desc[i].offset;
if (framelen <= 4)
continue; /* no data */
/*
* we found something informational from there
* the isoc frames have to type of headers
* type1: 00 xx 00 00 or 20 xx 00 00
* type2: 80 xx 00 00 00 00 00 00 or a0 xx 00 00 00 00 00 00
* xx is a sequencer which has never been seen over 0x3f
* imho data written down looks like bayer, i see similarities
* after every 640 bytes
*/
if (*iso_buf & 0x80) {
framelen -= 8;
iso_buf += 8;
/* This marks a new frame */
if (fb->v4lbuf.bytesused != 0
&& fb->v4lbuf.bytesused != dev->frame_size) {
(void) (printk_ratelimit() &&
STK_ERROR("frame %d, "
"bytesused=%d, skipping\n",
i, fb->v4lbuf.bytesused));
fb->v4lbuf.bytesused = 0;
fill = fb->buffer;
} else if (fb->v4lbuf.bytesused == dev->frame_size) {
if (list_is_singular(&dev->sio_avail)) {
/* Always reuse the last buffer */
fb->v4lbuf.bytesused = 0;
fill = fb->buffer;
} else {
list_move_tail(dev->sio_avail.next,
&dev->sio_full);
wake_up(&dev->wait_frame);
fb = list_first_entry(&dev->sio_avail,
struct stk_sio_buffer, list);
fb->v4lbuf.bytesused = 0;
fill = fb->buffer;
}
}
} else {
framelen -= 4;
iso_buf += 4;
}
/* Our buffer is full !!! */
if (framelen + fb->v4lbuf.bytesused > dev->frame_size) {
(void) (printk_ratelimit() &&
STK_ERROR("Frame buffer overflow, lost sync\n"));
/*FIXME Do something here? */
continue;
}
spin_unlock_irqrestore(&dev->spinlock, flags);
memcpy(fill, iso_buf, framelen);
spin_lock_irqsave(&dev->spinlock, flags);
fill += framelen;
/* New size of our buffer */
fb->v4lbuf.bytesused += framelen;
}
resubmit:
spin_unlock_irqrestore(&dev->spinlock, flags);
urb->dev = dev->udev;
ret = usb_submit_urb(urb, GFP_ATOMIC);
if (ret != 0) {
STK_ERROR("Error (%d) re-submitting urb in stk_isoc_handler.\n",
ret);
}
}
/* -------------------------------------------- */
static int stk_prepare_iso(struct stk_camera *dev)
{
void *kbuf;
int i, j;
struct urb *urb;
struct usb_device *udev;
if (dev == NULL)
return -ENXIO;
udev = dev->udev;
if (dev->isobufs)
STK_ERROR("isobufs already allocated. Bad\n");
else
dev->isobufs = kzalloc(MAX_ISO_BUFS * sizeof(*dev->isobufs),
GFP_KERNEL);
if (dev->isobufs == NULL) {
STK_ERROR("Unable to allocate iso buffers\n");
return -ENOMEM;
}
for (i = 0; i < MAX_ISO_BUFS; i++) {
if (dev->isobufs[i].data == NULL) {
kbuf = kzalloc(ISO_BUFFER_SIZE, GFP_KERNEL);
if (kbuf == NULL) {
STK_ERROR("Failed to allocate iso buffer %d\n",
i);
goto isobufs_out;
}
dev->isobufs[i].data = kbuf;
} else
STK_ERROR("isobuf data already allocated\n");
if (dev->isobufs[i].urb == NULL) {
urb = usb_alloc_urb(ISO_FRAMES_PER_DESC, GFP_KERNEL);
if (urb == NULL) {
STK_ERROR("Failed to allocate URB %d\n", i);
goto isobufs_out;
}
dev->isobufs[i].urb = urb;
} else {
STK_ERROR("Killing URB\n");
usb_kill_urb(dev->isobufs[i].urb);
urb = dev->isobufs[i].urb;
}
urb->interval = 1;
urb->dev = udev;
urb->pipe = usb_rcvisocpipe(udev, dev->isoc_ep);
urb->transfer_flags = URB_ISO_ASAP;
urb->transfer_buffer = dev->isobufs[i].data;
urb->transfer_buffer_length = ISO_BUFFER_SIZE;
urb->complete = stk_isoc_handler;
urb->context = dev;
urb->start_frame = 0;
urb->number_of_packets = ISO_FRAMES_PER_DESC;
for (j = 0; j < ISO_FRAMES_PER_DESC; j++) {
urb->iso_frame_desc[j].offset = j * ISO_MAX_FRAME_SIZE;
urb->iso_frame_desc[j].length = ISO_MAX_FRAME_SIZE;
}
}
set_memallocd(dev);
return 0;
isobufs_out:
for (i = 0; i < MAX_ISO_BUFS && dev->isobufs[i].data; i++)
kfree(dev->isobufs[i].data);
for (i = 0; i < MAX_ISO_BUFS && dev->isobufs[i].urb; i++)
usb_free_urb(dev->isobufs[i].urb);
kfree(dev->isobufs);
dev->isobufs = NULL;
return -ENOMEM;
}
static void stk_clean_iso(struct stk_camera *dev)
{
int i;
if (dev == NULL || dev->isobufs == NULL)
return;
for (i = 0; i < MAX_ISO_BUFS; i++) {
struct urb *urb;
urb = dev->isobufs[i].urb;
if (urb) {
if (atomic_read(&dev->urbs_used))
usb_kill_urb(urb);
usb_free_urb(urb);
}
kfree(dev->isobufs[i].data);
}
kfree(dev->isobufs);
dev->isobufs = NULL;
unset_memallocd(dev);
}
static int stk_setup_siobuf(struct stk_camera *dev, int index)
{
struct stk_sio_buffer *buf = dev->sio_bufs + index;
INIT_LIST_HEAD(&buf->list);
buf->v4lbuf.length = PAGE_ALIGN(dev->frame_size);
buf->buffer = vmalloc_user(buf->v4lbuf.length);
if (buf->buffer == NULL)
return -ENOMEM;
buf->mapcount = 0;
buf->dev = dev;
buf->v4lbuf.index = index;
buf->v4lbuf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf->v4lbuf.field = V4L2_FIELD_NONE;
buf->v4lbuf.memory = V4L2_MEMORY_MMAP;
buf->v4lbuf.m.offset = 2*index*buf->v4lbuf.length;
return 0;
}
static int stk_free_sio_buffers(struct stk_camera *dev)
{
int i;
int nbufs;
unsigned long flags;
if (dev->n_sbufs == 0 || dev->sio_bufs == NULL)
return 0;
/*
* If any buffers are mapped, we cannot free them at all.
*/
for (i = 0; i < dev->n_sbufs; i++) {
if (dev->sio_bufs[i].mapcount > 0)
return -EBUSY;
}
/*
* OK, let's do it.
*/
spin_lock_irqsave(&dev->spinlock, flags);
INIT_LIST_HEAD(&dev->sio_avail);
INIT_LIST_HEAD(&dev->sio_full);
nbufs = dev->n_sbufs;
dev->n_sbufs = 0;
spin_unlock_irqrestore(&dev->spinlock, flags);
for (i = 0; i < nbufs; i++) {
if (dev->sio_bufs[i].buffer != NULL)
vfree(dev->sio_bufs[i].buffer);
}
kfree(dev->sio_bufs);
dev->sio_bufs = NULL;
return 0;
}
static int stk_prepare_sio_buffers(struct stk_camera *dev, unsigned n_sbufs)
{
int i;
if (dev->sio_bufs != NULL)
STK_ERROR("sio_bufs already allocated\n");
else {
dev->sio_bufs = kzalloc(n_sbufs * sizeof(struct stk_sio_buffer),
GFP_KERNEL);
if (dev->sio_bufs == NULL)
return -ENOMEM;
for (i = 0; i < n_sbufs; i++) {
if (stk_setup_siobuf(dev, i))
return (dev->n_sbufs > 1)? 0 : -ENOMEM;
dev->n_sbufs = i+1;
}
}
return 0;
}
static int stk_allocate_buffers(struct stk_camera *dev, unsigned n_sbufs)
{
int err;
err = stk_prepare_iso(dev);
if (err) {
stk_clean_iso(dev);
return err;
}
err = stk_prepare_sio_buffers(dev, n_sbufs);
if (err) {
stk_free_sio_buffers(dev);
return err;
}
return 0;
}
static void stk_free_buffers(struct stk_camera *dev)
{
stk_clean_iso(dev);
stk_free_sio_buffers(dev);
}
/* -------------------------------------------- */
/* v4l file operations */
static int v4l_stk_open(struct inode *inode, struct file *fp)
{
struct stk_camera *dev;
struct video_device *vdev;
vdev = video_devdata(fp);
dev = vdev_to_camera(vdev);
lock_kernel();
if (dev == NULL || !is_present(dev)) {
unlock_kernel();
return -ENXIO;
}
fp->private_data = vdev;
kref_get(&dev->kref);
usb_autopm_get_interface(dev->interface);
unlock_kernel();
return 0;
}
static int v4l_stk_release(struct inode *inode, struct file *fp)
{
struct stk_camera *dev;
struct video_device *vdev;
vdev = video_devdata(fp);
if (vdev == NULL) {
STK_ERROR("v4l_release called w/o video devdata\n");
return -EFAULT;
}
dev = vdev_to_camera(vdev);
if (dev == NULL) {
STK_ERROR("v4l_release called on removed device\n");
return -ENODEV;
}
if (dev->owner != fp) {
usb_autopm_put_interface(dev->interface);
kref_put(&dev->kref, stk_camera_cleanup);
return 0;
}
stk_stop_stream(dev);
stk_free_buffers(dev);
dev->owner = NULL;
usb_autopm_put_interface(dev->interface);
kref_put(&dev->kref, stk_camera_cleanup);
return 0;
}
static ssize_t v4l_stk_read(struct file *fp, char __user *buf,
size_t count, loff_t *f_pos)
{
int i;
int ret;
unsigned long flags;
struct stk_camera *dev;
struct video_device *vdev;
struct stk_sio_buffer *sbuf;
vdev = video_devdata(fp);
if (vdev == NULL)
return -EFAULT;
dev = vdev_to_camera(vdev);
if (dev == NULL)
return -EIO;
if (!is_present(dev))
return -EIO;
if (dev->owner && dev->owner != fp)
return -EBUSY;
dev->owner = fp;
if (!is_streaming(dev)) {
if (stk_initialise(dev)
|| stk_allocate_buffers(dev, 3)
|| stk_start_stream(dev))
return -ENOMEM;
spin_lock_irqsave(&dev->spinlock, flags);
for (i = 0; i < dev->n_sbufs; i++) {
list_add_tail(&dev->sio_bufs[i].list, &dev->sio_avail);
dev->sio_bufs[i].v4lbuf.flags = V4L2_BUF_FLAG_QUEUED;
}
spin_unlock_irqrestore(&dev->spinlock, flags);
}
if (*f_pos == 0) {
if (fp->f_flags & O_NONBLOCK && list_empty(&dev->sio_full))
return -EWOULDBLOCK;
ret = wait_event_interruptible(dev->wait_frame,
!list_empty(&dev->sio_full) || !is_present(dev));
if (ret)
return ret;
if (!is_present(dev))
return -EIO;
}
if (count + *f_pos > dev->frame_size)
count = dev->frame_size - *f_pos;
spin_lock_irqsave(&dev->spinlock, flags);
if (list_empty(&dev->sio_full)) {
spin_unlock_irqrestore(&dev->spinlock, flags);
STK_ERROR("BUG: No siobufs ready\n");
return 0;
}
sbuf = list_first_entry(&dev->sio_full, struct stk_sio_buffer, list);
spin_unlock_irqrestore(&dev->spinlock, flags);
if (copy_to_user(buf, sbuf->buffer + *f_pos, count))
return -EFAULT;
*f_pos += count;
if (*f_pos >= dev->frame_size) {
*f_pos = 0;
spin_lock_irqsave(&dev->spinlock, flags);
list_move_tail(&sbuf->list, &dev->sio_avail);
spin_unlock_irqrestore(&dev->spinlock, flags);
}
return count;
}
static unsigned int v4l_stk_poll(struct file *fp, poll_table *wait)
{
struct stk_camera *dev;
struct video_device *vdev;
vdev = video_devdata(fp);
if (vdev == NULL)
return -EFAULT;
dev = vdev_to_camera(vdev);
if (dev == NULL)
return -ENODEV;
poll_wait(fp, &dev->wait_frame, wait);
if (!is_present(dev))
return POLLERR;
if (!list_empty(&dev->sio_full))
return (POLLIN | POLLRDNORM);
return 0;
}
static void stk_v4l_vm_open(struct vm_area_struct *vma)
{
struct stk_sio_buffer *sbuf = vma->vm_private_data;
sbuf->mapcount++;
}
static void stk_v4l_vm_close(struct vm_area_struct *vma)
{
struct stk_sio_buffer *sbuf = vma->vm_private_data;
sbuf->mapcount--;
if (sbuf->mapcount == 0)
sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_MAPPED;
}
static struct vm_operations_struct stk_v4l_vm_ops = {
.open = stk_v4l_vm_open,
.close = stk_v4l_vm_close
};
static int v4l_stk_mmap(struct file *fp, struct vm_area_struct *vma)
{
unsigned int i;
int ret;
unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
struct stk_camera *dev;
struct video_device *vdev;
struct stk_sio_buffer *sbuf = NULL;
if (!(vma->vm_flags & VM_WRITE) || !(vma->vm_flags & VM_SHARED))
return -EINVAL;
vdev = video_devdata(fp);
dev = vdev_to_camera(vdev);
for (i = 0; i < dev->n_sbufs; i++) {
if (dev->sio_bufs[i].v4lbuf.m.offset == offset) {
sbuf = dev->sio_bufs + i;
break;
}
}
if (sbuf == NULL)
return -EINVAL;
ret = remap_vmalloc_range(vma, sbuf->buffer, 0);
if (ret)
return ret;
vma->vm_flags |= VM_DONTEXPAND;
vma->vm_private_data = sbuf;
vma->vm_ops = &stk_v4l_vm_ops;
sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_MAPPED;
stk_v4l_vm_open(vma);
return 0;
}
/* v4l ioctl handlers */
static int stk_vidioc_querycap(struct file *filp,
void *priv, struct v4l2_capability *cap)
{
strcpy(cap->driver, "stk");
strcpy(cap->card, "stk");
cap->version = DRIVER_VERSION_NUM;
cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
| V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
return 0;
}
static int stk_vidioc_enum_input(struct file *filp,
void *priv, struct v4l2_input *input)
{
if (input->index != 0)
return -EINVAL;
strcpy(input->name, "Syntek USB Camera");
input->type = V4L2_INPUT_TYPE_CAMERA;
return 0;
}
static int stk_vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
{
*i = 0;
return 0;
}
static int stk_vidioc_s_input(struct file *filp, void *priv, unsigned int i)
{
if (i != 0)
return -EINVAL;
else
return 0;
}
/* from vivi.c */
static int stk_vidioc_s_std(struct file *filp, void *priv, v4l2_std_id *a)
{
return 0;
}
/* List of all V4Lv2 controls supported by the driver */
static struct v4l2_queryctrl stk_controls[] = {
{
.id = V4L2_CID_BRIGHTNESS,
.type = V4L2_CTRL_TYPE_INTEGER,
.name = "Brightness",
.minimum = 0,
.maximum = 0xffff,
.step = 0x0100,
.default_value = 0x6000,
},
/*TODO: get more controls to work */
};
static int stk_vidioc_queryctrl(struct file *filp,
void *priv, struct v4l2_queryctrl *c)
{
int i;
int nbr;
nbr = ARRAY_SIZE(stk_controls);
for (i = 0; i < nbr; i++) {
if (stk_controls[i].id == c->id) {
memcpy(c, &stk_controls[i],
sizeof(struct v4l2_queryctrl));
return 0;
}
}
return -EINVAL;
}
static int stk_vidioc_g_ctrl(struct file *filp,
void *priv, struct v4l2_control *c)
{
struct stk_camera *dev = priv;
switch (c->id) {
case V4L2_CID_BRIGHTNESS:
c->value = dev->vsettings.brightness;
break;
default:
return -EINVAL;
}
return 0;
}
static int stk_vidioc_s_ctrl(struct file *filp,
void *priv, struct v4l2_control *c)
{
struct stk_camera *dev = priv;
switch (c->id) {
case V4L2_CID_BRIGHTNESS:
dev->vsettings.brightness = c->value;
return stk_sensor_set_brightness(dev, c->value >> 8);
default:
return -EINVAL;
}
return 0;
}
static int stk_vidioc_enum_fmt_vid_cap(struct file *filp,
void *priv, struct v4l2_fmtdesc *fmtd)
{
fmtd->flags = 0;
switch (fmtd->index) {
case 0:
fmtd->pixelformat = V4L2_PIX_FMT_RGB565;
strcpy(fmtd->description, "r5g6b5");
break;
case 1:
fmtd->pixelformat = V4L2_PIX_FMT_RGB565X;
strcpy(fmtd->description, "r5g6b5BE");
break;
case 2:
fmtd->pixelformat = V4L2_PIX_FMT_UYVY;
strcpy(fmtd->description, "yuv4:2:2");
break;
case 3:
fmtd->pixelformat = V4L2_PIX_FMT_SBGGR8;
strcpy(fmtd->description, "Raw bayer");
break;
case 4:
fmtd->pixelformat = V4L2_PIX_FMT_YUYV;
strcpy(fmtd->description, "yuv4:2:2");
break;
default:
return -EINVAL;
}
return 0;
}
static struct stk_size {
unsigned w;
unsigned h;
enum stk_mode m;
} stk_sizes[] = {
{ .w = 1280, .h = 1024, .m = MODE_SXGA, },
{ .w = 640, .h = 480, .m = MODE_VGA, },
{ .w = 352, .h = 288, .m = MODE_CIF, },
{ .w = 320, .h = 240, .m = MODE_QVGA, },
{ .w = 176, .h = 144, .m = MODE_QCIF, },
};
static int stk_vidioc_g_fmt_vid_cap(struct file *filp,
void *priv, struct v4l2_format *f)
{
struct v4l2_pix_format *pix_format = &f->fmt.pix;
struct stk_camera *dev = priv;
int i;
for (i = 0; i < ARRAY_SIZE(stk_sizes)
&& stk_sizes[i].m != dev->vsettings.mode;
i++);
if (i == ARRAY_SIZE(stk_sizes)) {
STK_ERROR("ERROR: mode invalid\n");
return -EINVAL;
}
pix_format->width = stk_sizes[i].w;
pix_format->height = stk_sizes[i].h;
pix_format->field = V4L2_FIELD_NONE;
pix_format->colorspace = V4L2_COLORSPACE_SRGB;
pix_format->priv = 0;
pix_format->pixelformat = dev->vsettings.palette;
if (dev->vsettings.palette == V4L2_PIX_FMT_SBGGR8)
pix_format->bytesperline = pix_format->width;
else
pix_format->bytesperline = 2 * pix_format->width;
pix_format->sizeimage = pix_format->bytesperline
* pix_format->height;
return 0;
}
static int stk_vidioc_try_fmt_vid_cap(struct file *filp,
void *priv, struct v4l2_format *fmtd)
{
int i;
switch (fmtd->fmt.pix.pixelformat) {
case V4L2_PIX_FMT_RGB565:
case V4L2_PIX_FMT_RGB565X:
case V4L2_PIX_FMT_UYVY:
case V4L2_PIX_FMT_YUYV:
case V4L2_PIX_FMT_SBGGR8:
break;
default:
return -EINVAL;
}
for (i = 1; i < ARRAY_SIZE(stk_sizes); i++) {
if (fmtd->fmt.pix.width > stk_sizes[i].w)
break;
}
if (i == ARRAY_SIZE(stk_sizes)
|| (abs(fmtd->fmt.pix.width - stk_sizes[i-1].w)
< abs(fmtd->fmt.pix.width - stk_sizes[i].w))) {
fmtd->fmt.pix.height = stk_sizes[i-1].h;
fmtd->fmt.pix.width = stk_sizes[i-1].w;
fmtd->fmt.pix.priv = i - 1;
} else {
fmtd->fmt.pix.height = stk_sizes[i].h;
fmtd->fmt.pix.width = stk_sizes[i].w;
fmtd->fmt.pix.priv = i;
}
fmtd->fmt.pix.field = V4L2_FIELD_NONE;
fmtd->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB;
if (fmtd->fmt.pix.pixelformat == V4L2_PIX_FMT_SBGGR8)
fmtd->fmt.pix.bytesperline = fmtd->fmt.pix.width;
else
fmtd->fmt.pix.bytesperline = 2 * fmtd->fmt.pix.width;
fmtd->fmt.pix.sizeimage = fmtd->fmt.pix.bytesperline
* fmtd->fmt.pix.height;
return 0;
}
static int stk_setup_format(struct stk_camera *dev)
{
int i = 0;
int depth;
if (dev->vsettings.palette == V4L2_PIX_FMT_SBGGR8)
depth = 1;
else
depth = 2;
while (stk_sizes[i].m != dev->vsettings.mode
&& i < ARRAY_SIZE(stk_sizes))
i++;
if (i == ARRAY_SIZE(stk_sizes)) {
STK_ERROR("Something is broken in %s\n", __func__);
return -EFAULT;
}
/* This registers controls some timings, not sure of what. */
stk_camera_write_reg(dev, 0x001b, 0x0e);
if (dev->vsettings.mode == MODE_SXGA)
stk_camera_write_reg(dev, 0x001c, 0x0e);
else
stk_camera_write_reg(dev, 0x001c, 0x46);
/*
* Registers 0x0115 0x0114 are the size of each line (bytes),
* regs 0x0117 0x0116 are the heigth of the image.
*/
stk_camera_write_reg(dev, 0x0115,
((stk_sizes[i].w * depth) >> 8) & 0xff);
stk_camera_write_reg(dev, 0x0114,
(stk_sizes[i].w * depth) & 0xff);
stk_camera_write_reg(dev, 0x0117,
(stk_sizes[i].h >> 8) & 0xff);
stk_camera_write_reg(dev, 0x0116,
stk_sizes[i].h & 0xff);
return stk_sensor_configure(dev);
}
static int stk_vidioc_s_fmt_vid_cap(struct file *filp,
void *priv, struct v4l2_format *fmtd)
{
int ret;
struct stk_camera *dev = priv;
if (dev == NULL)
return -ENODEV;
if (!is_present(dev))
return -ENODEV;
if (is_streaming(dev))
return -EBUSY;
if (dev->owner && dev->owner != filp)
return -EBUSY;
ret = stk_vidioc_try_fmt_vid_cap(filp, priv, fmtd);
if (ret)
return ret;
dev->owner = filp;
dev->vsettings.palette = fmtd->fmt.pix.pixelformat;
stk_free_buffers(dev);
dev->frame_size = fmtd->fmt.pix.sizeimage;
dev->vsettings.mode = stk_sizes[fmtd->fmt.pix.priv].m;
stk_initialise(dev);
return stk_setup_format(dev);
}
static int stk_vidioc_reqbufs(struct file *filp,
void *priv, struct v4l2_requestbuffers *rb)
{
struct stk_camera *dev = priv;
if (dev == NULL)
return -ENODEV;
if (rb->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
if (rb->memory != V4L2_MEMORY_MMAP)
return -EINVAL;
if (is_streaming(dev)
|| (dev->owner && dev->owner != filp))
return -EBUSY;
dev->owner = filp;
/*FIXME If they ask for zero, we must stop streaming and free */
if (rb->count < 3)
rb->count = 3;
/* Arbitrary limit */
else if (rb->count > 5)
rb->count = 5;
stk_allocate_buffers(dev, rb->count);
rb->count = dev->n_sbufs;
return 0;
}
static int stk_vidioc_querybuf(struct file *filp,
void *priv, struct v4l2_buffer *buf)
{
int index;
struct stk_camera *dev = priv;
struct stk_sio_buffer *sbuf;
if (buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
index = buf->index;
if (index < 0 || index >= dev->n_sbufs)
return -EINVAL;
sbuf = dev->sio_bufs + buf->index;
*buf = sbuf->v4lbuf;
return 0;
}
static int stk_vidioc_qbuf(struct file *filp,
void *priv, struct v4l2_buffer *buf)
{
struct stk_camera *dev = priv;
struct stk_sio_buffer *sbuf;
unsigned long flags;
if (buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
if (buf->memory != V4L2_MEMORY_MMAP)
return -EINVAL;
if (buf->index < 0 || buf->index >= dev->n_sbufs)
return -EINVAL;
sbuf = dev->sio_bufs + buf->index;
if (sbuf->v4lbuf.flags & V4L2_BUF_FLAG_QUEUED)
return 0;
sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_QUEUED;
sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_DONE;
spin_lock_irqsave(&dev->spinlock, flags);
list_add_tail(&sbuf->list, &dev->sio_avail);
*buf = sbuf->v4lbuf;
spin_unlock_irqrestore(&dev->spinlock, flags);
return 0;
}
static int stk_vidioc_dqbuf(struct file *filp,
void *priv, struct v4l2_buffer *buf)
{
struct stk_camera *dev = priv;
struct stk_sio_buffer *sbuf;
unsigned long flags;
int ret;
if (buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE
|| !is_streaming(dev))
return -EINVAL;
if (filp->f_flags & O_NONBLOCK && list_empty(&dev->sio_full))
return -EWOULDBLOCK;
ret = wait_event_interruptible(dev->wait_frame,
!list_empty(&dev->sio_full) || !is_present(dev));
if (ret)
return ret;
if (!is_present(dev))
return -EIO;
spin_lock_irqsave(&dev->spinlock, flags);
sbuf = list_first_entry(&dev->sio_full, struct stk_sio_buffer, list);
list_del_init(&sbuf->list);
spin_unlock_irqrestore(&dev->spinlock, flags);
sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_QUEUED;
sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_DONE;
sbuf->v4lbuf.sequence = ++dev->sequence;
do_gettimeofday(&sbuf->v4lbuf.timestamp);
*buf = sbuf->v4lbuf;
return 0;
}
static int stk_vidioc_streamon(struct file *filp,
void *priv, enum v4l2_buf_type type)
{
struct stk_camera *dev = priv;
if (is_streaming(dev))
return 0;
if (dev->sio_bufs == NULL)
return -EINVAL;
dev->sequence = 0;
return stk_start_stream(dev);
}
static int stk_vidioc_streamoff(struct file *filp,
void *priv, enum v4l2_buf_type type)
{
struct stk_camera *dev = priv;
unsigned long flags;
int i;
stk_stop_stream(dev);
spin_lock_irqsave(&dev->spinlock, flags);
INIT_LIST_HEAD(&dev->sio_avail);
INIT_LIST_HEAD(&dev->sio_full);
for (i = 0; i < dev->n_sbufs; i++) {
INIT_LIST_HEAD(&dev->sio_bufs[i].list);
dev->sio_bufs[i].v4lbuf.flags = 0;
}
spin_unlock_irqrestore(&dev->spinlock, flags);
return 0;
}
static int stk_vidioc_g_parm(struct file *filp,
void *priv, struct v4l2_streamparm *sp)
{
if (sp->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
sp->parm.capture.capability = 0;
sp->parm.capture.capturemode = 0;
/*FIXME This is not correct */
sp->parm.capture.timeperframe.numerator = 1;
sp->parm.capture.timeperframe.denominator = 30;
sp->parm.capture.readbuffers = 2;
sp->parm.capture.extendedmode = 0;
return 0;
}
static struct file_operations v4l_stk_fops = {
.owner = THIS_MODULE,
.open = v4l_stk_open,
.release = v4l_stk_release,
.read = v4l_stk_read,
.poll = v4l_stk_poll,
.mmap = v4l_stk_mmap,
.ioctl = video_ioctl2,
#ifdef CONFIG_COMPAT
.compat_ioctl = v4l_compat_ioctl32,
#endif
.llseek = no_llseek
};
static const struct v4l2_ioctl_ops v4l_stk_ioctl_ops = {
.vidioc_querycap = stk_vidioc_querycap,
.vidioc_enum_fmt_vid_cap = stk_vidioc_enum_fmt_vid_cap,
.vidioc_try_fmt_vid_cap = stk_vidioc_try_fmt_vid_cap,
.vidioc_s_fmt_vid_cap = stk_vidioc_s_fmt_vid_cap,
.vidioc_g_fmt_vid_cap = stk_vidioc_g_fmt_vid_cap,
.vidioc_enum_input = stk_vidioc_enum_input,
.vidioc_s_input = stk_vidioc_s_input,
.vidioc_g_input = stk_vidioc_g_input,
.vidioc_s_std = stk_vidioc_s_std,
.vidioc_reqbufs = stk_vidioc_reqbufs,
.vidioc_querybuf = stk_vidioc_querybuf,
.vidioc_qbuf = stk_vidioc_qbuf,
.vidioc_dqbuf = stk_vidioc_dqbuf,
.vidioc_streamon = stk_vidioc_streamon,
.vidioc_streamoff = stk_vidioc_streamoff,
.vidioc_queryctrl = stk_vidioc_queryctrl,
.vidioc_g_ctrl = stk_vidioc_g_ctrl,
.vidioc_s_ctrl = stk_vidioc_s_ctrl,
.vidioc_g_parm = stk_vidioc_g_parm,
};
static void stk_v4l_dev_release(struct video_device *vd)
{
}
static struct video_device stk_v4l_data = {
.name = "stkwebcam",
.minor = -1,
.tvnorms = V4L2_STD_UNKNOWN,
.current_norm = V4L2_STD_UNKNOWN,
.fops = &v4l_stk_fops,
.ioctl_ops = &v4l_stk_ioctl_ops,
.release = stk_v4l_dev_release,
};
static int stk_register_video_device(struct stk_camera *dev)
{
int err;
dev->vdev = stk_v4l_data;
dev->vdev.debug = debug;
dev->vdev.parent = &dev->interface->dev;
dev->vdev.priv = dev;
err = video_register_device(&dev->vdev, VFL_TYPE_GRABBER, -1);
if (err)
STK_ERROR("v4l registration failed\n");
else
STK_INFO("Syntek USB2.0 Camera is now controlling video device"
" /dev/video%d\n", dev->vdev.minor);
return err;
}
/* USB Stuff */
static int stk_camera_probe(struct usb_interface *interface,
const struct usb_device_id *id)
{
int i;
int err;
struct stk_camera *dev = NULL;
struct usb_device *udev = interface_to_usbdev(interface);
struct usb_host_interface *iface_desc;
struct usb_endpoint_descriptor *endpoint;
dev = kzalloc(sizeof(struct stk_camera), GFP_KERNEL);
if (dev == NULL) {
STK_ERROR("Out of memory !\n");
return -ENOMEM;
}
kref_init(&dev->kref);
spin_lock_init(&dev->spinlock);
init_waitqueue_head(&dev->wait_frame);
dev->udev = udev;
dev->interface = interface;
usb_get_intf(interface);
dev->vsettings.vflip = vflip;
dev->vsettings.hflip = hflip;
dev->n_sbufs = 0;
set_present(dev);
/* Set up the endpoint information
* use only the first isoc-in endpoint
* for the current alternate setting */
iface_desc = interface->cur_altsetting;
for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
endpoint = &iface_desc->endpoint[i].desc;
if (!dev->isoc_ep
&& ((endpoint->bEndpointAddress
& USB_ENDPOINT_DIR_MASK) == USB_DIR_IN)
&& ((endpoint->bmAttributes
& USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_ISOC)) {
/* we found an isoc in endpoint */
dev->isoc_ep = (endpoint->bEndpointAddress & 0xF);
break;
}
}
if (!dev->isoc_ep) {
STK_ERROR("Could not find isoc-in endpoint");
kref_put(&dev->kref, stk_camera_cleanup);
return -ENODEV;
}
dev->vsettings.brightness = 0x7fff;
dev->vsettings.palette = V4L2_PIX_FMT_RGB565;
dev->vsettings.mode = MODE_VGA;
dev->frame_size = 640 * 480 * 2;
INIT_LIST_HEAD(&dev->sio_avail);
INIT_LIST_HEAD(&dev->sio_full);
usb_set_intfdata(interface, dev);
err = stk_register_video_device(dev);
if (err) {
kref_put(&dev->kref, stk_camera_cleanup);
return err;
}
stk_create_sysfs_files(&dev->vdev);
usb_autopm_enable(dev->interface);
return 0;
}
static void stk_camera_disconnect(struct usb_interface *interface)
{
struct stk_camera *dev = usb_get_intfdata(interface);
usb_set_intfdata(interface, NULL);
unset_present(dev);
wake_up_interruptible(&dev->wait_frame);
stk_remove_sysfs_files(&dev->vdev);
kref_put(&dev->kref, stk_camera_cleanup);
}
#ifdef CONFIG_PM
static int stk_camera_suspend(struct usb_interface *intf, pm_message_t message)
{
struct stk_camera *dev = usb_get_intfdata(intf);
if (is_streaming(dev)) {
stk_stop_stream(dev);
/* yes, this is ugly */
set_streaming(dev);
}
return 0;
}
static int stk_camera_resume(struct usb_interface *intf)
{
struct stk_camera *dev = usb_get_intfdata(intf);
if (!is_initialised(dev))
return 0;
unset_initialised(dev);
stk_initialise(dev);
stk_setup_format(dev);
if (is_streaming(dev))
stk_start_stream(dev);
return 0;
}
#endif
static struct usb_driver stk_camera_driver = {
.name = "stkwebcam",
.probe = stk_camera_probe,
.disconnect = stk_camera_disconnect,
.id_table = stkwebcam_table,
#ifdef CONFIG_PM
.suspend = stk_camera_suspend,
.resume = stk_camera_resume,
#endif
};
static int __init stk_camera_init(void)
{
int result;
result = usb_register(&stk_camera_driver);
if (result)
STK_ERROR("usb_register failed ! Error number %d\n", result);
return result;
}
static void __exit stk_camera_exit(void)
{
usb_deregister(&stk_camera_driver);
}
module_init(stk_camera_init);
module_exit(stk_camera_exit);
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