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linux-stable/drivers/media/video/stk-webcam.c
Arnd Bergmann 0edf2e5e2b [media] v4l: kill the BKL 
All of the hard problems for BKL removal appear to be solved in the
v4l-dvb/master tree. This removes the BKL from the various open
functions that do not need it, or only use it to protect an
open count.

The zoran driver is nontrivial in this regard, so I introduce
a new mutex that locks both the open/release and the ioctl
functions. Someone with access to the hardware can probably
improve that by using the existing lock in all cases.

Finally, all drivers that still use the locked version of the
ioctl function now get called under a new mutex instead of
the BKL.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-11-08 22:35:57 -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/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);
/*
* 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) && is_present(dev))
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 file *fp)
{
struct stk_camera *dev;
struct video_device *vdev;
vdev = video_devdata(fp);
dev = vdev_to_camera(vdev);
if (dev == NULL || !is_present(dev)) {
return -ENXIO;
}
fp->private_data = dev;
usb_autopm_get_interface(dev->interface);
return 0;
}
static int v4l_stk_release(struct file *fp)
{
struct stk_camera *dev = fp->private_data;
if (dev->owner == fp) {
stk_stop_stream(dev);
stk_free_buffers(dev);
dev->owner = NULL;
}
if(is_present(dev))
usb_autopm_put_interface(dev->interface);
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_sio_buffer *sbuf;
struct stk_camera *dev = fp->private_data;
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 = fp->private_data;
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 const 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 = fp->private_data;
struct stk_sio_buffer *sbuf = NULL;
if (!(vma->vm_flags & VM_WRITE) || !(vma->vm_flags & VM_SHARED))
return -EINVAL;
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)
{
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->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 (i < ARRAY_SIZE(stk_sizes) &&
stk_sizes[i].m != dev->vsettings.mode)
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->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)
{
struct stk_camera *dev = priv;
struct stk_sio_buffer *sbuf;
if (buf->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->memory != V4L2_MEMORY_MMAP)
return -EINVAL;
if (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 (!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)
{
/*FIXME This is not correct */
sp->parm.capture.timeperframe.numerator = 1;
sp->parm.capture.timeperframe.denominator = 30;
sp->parm.capture.readbuffers = 2;
return 0;
}
static int stk_vidioc_enum_framesizes(struct file *filp,
void *priv, struct v4l2_frmsizeenum *frms)
{
if (frms->index >= ARRAY_SIZE(stk_sizes))
return -EINVAL;
switch (frms->pixel_format) {
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:
frms->type = V4L2_FRMSIZE_TYPE_DISCRETE;
frms->discrete.width = stk_sizes[frms->index].w;
frms->discrete.height = stk_sizes[frms->index].h;
return 0;
default: return -EINVAL;
}
}
static struct v4l2_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,
};
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,
.vidioc_enum_framesizes = stk_vidioc_enum_framesizes,
};
static void stk_v4l_dev_release(struct video_device *vd)
{
struct stk_camera *dev = vdev_to_camera(vd);
if (dev->sio_bufs != NULL || dev->isobufs != NULL)
STK_ERROR("We are leaking memory\n");
usb_put_intf(dev->interface);
kfree(dev);
}
static struct video_device stk_v4l_data = {
.name = "stkwebcam",
.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;
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 device %s\n",
video_device_node_name(&dev->vdev));
return err;
}
/* USB Stuff */
static int stk_camera_probe(struct usb_interface *interface,
const struct usb_device_id *id)
{
int i;
int err = 0;
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;
}
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
&& usb_endpoint_is_isoc_in(endpoint)) {
/* we found an isoc in endpoint */
dev->isoc_ep = usb_endpoint_num(endpoint);
break;
}
}
if (!dev->isoc_ep) {
STK_ERROR("Could not find isoc-in endpoint");
err = -ENODEV;
goto error;
}
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) {
goto error;
}
stk_create_sysfs_files(&dev->vdev);
return 0;
error:
kfree(dev);
return err;
}
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);
STK_INFO("Syntek USB2.0 Camera release resources device %s\n",
video_device_node_name(&dev->vdev));
video_unregister_device(&dev->vdev);
}
#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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