Google Git
Sign in
android-kvm / linux / 33052057e3e2db7f37fc78aa3f25c98f7e989fae / . / drivers / usb / media / et61x251_core.c
blob: 2c0171a5ad6253194c7dd625f097760da22e7759 [file] [log] [blame]
/***************************************************************************
* V4L2 driver for ET61X[12]51 PC Camera Controllers *
* *
* Copyright (C) 2006 by Luca Risolia <luca.risolia@studio.unibo.it> *
* *
* 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. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the Free Software *
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. *
***************************************************************************/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/param.h>
#include <linux/moduleparam.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/device.h>
#include <linux/fs.h>
#include <linux/delay.h>
#include <linux/stddef.h>
#include <linux/compiler.h>
#include <linux/ioctl.h>
#include <linux/poll.h>
#include <linux/stat.h>
#include <linux/mm.h>
#include <linux/vmalloc.h>
#include <linux/page-flags.h>
#include <linux/byteorder/generic.h>
#include <asm/page.h>
#include <asm/uaccess.h>
#include "et61x251.h"
/*****************************************************************************/
#define ET61X251_MODULE_NAME "V4L2 driver for ET61X[12]51 " \
"PC Camera Controllers"
#define ET61X251_MODULE_AUTHOR "(C) 2006 Luca Risolia"
#define ET61X251_AUTHOR_EMAIL "<luca.risolia@studio.unibo.it>"
#define ET61X251_MODULE_LICENSE "GPL"
#define ET61X251_MODULE_VERSION "1:1.01"
#define ET61X251_MODULE_VERSION_CODE KERNEL_VERSION(1, 0, 1)
/*****************************************************************************/
MODULE_DEVICE_TABLE(usb, et61x251_id_table);
MODULE_AUTHOR(ET61X251_MODULE_AUTHOR " " ET61X251_AUTHOR_EMAIL);
MODULE_DESCRIPTION(ET61X251_MODULE_NAME);
MODULE_VERSION(ET61X251_MODULE_VERSION);
MODULE_LICENSE(ET61X251_MODULE_LICENSE);
static short video_nr[] = {[0 ... ET61X251_MAX_DEVICES-1] = -1};
module_param_array(video_nr, short, NULL, 0444);
MODULE_PARM_DESC(video_nr,
"\n<-1|n[,...]> Specify V4L2 minor mode number."
"\n -1 = use next available (default)"
"\n n = use minor number n (integer >= 0)"
"\nYou can specify up to "
__MODULE_STRING(ET61X251_MAX_DEVICES) " cameras this way."
"\nFor example:"
"\nvideo_nr=-1,2,-1 would assign minor number 2 to"
"\nthe second registered camera and use auto for the first"
"\none and for every other camera."
"\n");
static short force_munmap[] = {[0 ... ET61X251_MAX_DEVICES-1] =
ET61X251_FORCE_MUNMAP};
module_param_array(force_munmap, bool, NULL, 0444);
MODULE_PARM_DESC(force_munmap,
"\n<0|1[,...]> Force the application to unmap previously"
"\nmapped buffer memory before calling any VIDIOC_S_CROP or"
"\nVIDIOC_S_FMT ioctl's. Not all the applications support"
"\nthis feature. This parameter is specific for each"
"\ndetected camera."
"\n 0 = do not force memory unmapping"
"\n 1 = force memory unmapping (save memory)"
"\nDefault value is "__MODULE_STRING(SN9C102_FORCE_MUNMAP)"."
"\n");
#ifdef ET61X251_DEBUG
static unsigned short debug = ET61X251_DEBUG_LEVEL;
module_param(debug, ushort, 0644);
MODULE_PARM_DESC(debug,
"\n<n> Debugging information level, from 0 to 3:"
"\n0 = none (use carefully)"
"\n1 = critical errors"
"\n2 = significant informations"
"\n3 = more verbose messages"
"\nLevel 3 is useful for testing only, when only "
"one device is used."
"\nDefault value is "__MODULE_STRING(ET61X251_DEBUG_LEVEL)"."
"\n");
#endif
/*****************************************************************************/
static u32
et61x251_request_buffers(struct et61x251_device* cam, u32 count,
enum et61x251_io_method io)
{
struct v4l2_pix_format* p = &(cam->sensor->pix_format);
struct v4l2_rect* r = &(cam->sensor->cropcap.bounds);
const size_t imagesize = cam->module_param.force_munmap ||
io == IO_READ ?
(p->width * p->height * p->priv) / 8 :
(r->width * r->height * p->priv) / 8;
void* buff = NULL;
u32 i;
if (count > ET61X251_MAX_FRAMES)
count = ET61X251_MAX_FRAMES;
cam->nbuffers = count;
while (cam->nbuffers > 0) {
if ((buff = vmalloc_32(cam->nbuffers * PAGE_ALIGN(imagesize))))
break;
cam->nbuffers--;
}
for (i = 0; i < cam->nbuffers; i++) {
cam->frame[i].bufmem = buff + i*PAGE_ALIGN(imagesize);
cam->frame[i].buf.index = i;
cam->frame[i].buf.m.offset = i*PAGE_ALIGN(imagesize);
cam->frame[i].buf.length = imagesize;
cam->frame[i].buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
cam->frame[i].buf.sequence = 0;
cam->frame[i].buf.field = V4L2_FIELD_NONE;
cam->frame[i].buf.memory = V4L2_MEMORY_MMAP;
cam->frame[i].buf.flags = 0;
}
return cam->nbuffers;
}
static void et61x251_release_buffers(struct et61x251_device* cam)
{
if (cam->nbuffers) {
vfree(cam->frame[0].bufmem);
cam->nbuffers = 0;
}
cam->frame_current = NULL;
}
static void et61x251_empty_framequeues(struct et61x251_device* cam)
{
u32 i;
INIT_LIST_HEAD(&cam->inqueue);
INIT_LIST_HEAD(&cam->outqueue);
for (i = 0; i < ET61X251_MAX_FRAMES; i++) {
cam->frame[i].state = F_UNUSED;
cam->frame[i].buf.bytesused = 0;
}
}
static void et61x251_requeue_outqueue(struct et61x251_device* cam)
{
struct et61x251_frame_t *i;
list_for_each_entry(i, &cam->outqueue, frame) {
i->state = F_QUEUED;
list_add(&i->frame, &cam->inqueue);
}
INIT_LIST_HEAD(&cam->outqueue);
}
static void et61x251_queue_unusedframes(struct et61x251_device* cam)
{
unsigned long lock_flags;
u32 i;
for (i = 0; i < cam->nbuffers; i++)
if (cam->frame[i].state == F_UNUSED) {
cam->frame[i].state = F_QUEUED;
spin_lock_irqsave(&cam->queue_lock, lock_flags);
list_add_tail(&cam->frame[i].frame, &cam->inqueue);
spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
}
}
/*****************************************************************************/
int et61x251_write_reg(struct et61x251_device* cam, u8 value, u16 index)
{
struct usb_device* udev = cam->usbdev;
u8* buff = cam->control_buffer;
int res;
*buff = value;
res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x00, 0x41,
0, index, buff, 1, ET61X251_CTRL_TIMEOUT);
if (res < 0) {
DBG(3, "Failed to write a register (value 0x%02X, index "
"0x%02X, error %d)", value, index, res);
return -1;
}
return 0;
}
int et61x251_read_reg(struct et61x251_device* cam, u16 index)
{
struct usb_device* udev = cam->usbdev;
u8* buff = cam->control_buffer;
int res;
res = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 0x00, 0xc1,
0, index, buff, 1, ET61X251_CTRL_TIMEOUT);
if (res < 0)
DBG(3, "Failed to read a register (index 0x%02X, error %d)",
index, res);
return (res >= 0) ? (int)(*buff) : -1;
}
static int
et61x251_i2c_wait(struct et61x251_device* cam, struct et61x251_sensor* sensor)
{
int i, r;
for (i = 1; i <= 8; i++) {
if (sensor->interface == ET61X251_I2C_3WIRES) {
r = et61x251_read_reg(cam, 0x8e);
if (!(r & 0x02) && (r >= 0))
return 0;
} else {
r = et61x251_read_reg(cam, 0x8b);
if (!(r & 0x01) && (r >= 0))
return 0;
}
if (r < 0)
return -EIO;
udelay(8*8); /* minimum for sensors at 400kHz */
}
return -EBUSY;
}
int
et61x251_i2c_try_read(struct et61x251_device* cam,
struct et61x251_sensor* sensor, u8 address)
{
struct usb_device* udev = cam->usbdev;
u8* data = cam->control_buffer;
int err = 0, res;
data[0] = address;
data[1] = cam->sensor->i2c_slave_id;
data[2] = cam->sensor->rsta | 0x10;
data[3] = !(et61x251_read_reg(cam, 0x8b) & 0x02);
res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x00, 0x41,
0, 0x88, data, 4, ET61X251_CTRL_TIMEOUT);
if (res < 0)
err += res;
err += et61x251_i2c_wait(cam, sensor);
res = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 0x00, 0xc1,
0, 0x80, data, 8, ET61X251_CTRL_TIMEOUT);
if (res < 0)
err += res;
if (err)
DBG(3, "I2C read failed for %s image sensor", sensor->name);
PDBGG("I2C read: address 0x%02X, value: 0x%02X", address, data[0]);
return err ? -1 : (int)data[0];
}
int
et61x251_i2c_try_write(struct et61x251_device* cam,
struct et61x251_sensor* sensor, u8 address, u8 value)
{
struct usb_device* udev = cam->usbdev;
u8* data = cam->control_buffer;
int err = 0, res;
data[0] = address;
data[1] = cam->sensor->i2c_slave_id;
data[2] = cam->sensor->rsta | 0x12;
res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x00, 0x41,
0, 0x88, data, 3, ET61X251_CTRL_TIMEOUT);
if (res < 0)
err += res;
data[0] = value;
res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x00, 0x41,
0, 0x80, data, 1, ET61X251_CTRL_TIMEOUT);
if (res < 0)
err += res;
err += et61x251_i2c_wait(cam, sensor);
if (err)
DBG(3, "I2C write failed for %s image sensor", sensor->name);
PDBGG("I2C write: address 0x%02X, value: 0x%02X", address, value);
return err ? -1 : 0;
}
int
et61x251_i2c_raw_write(struct et61x251_device* cam, u8 n, u8 data1, u8 data2,
u8 data3, u8 data4, u8 data5, u8 data6, u8 data7,
u8 data8, u8 address)
{
struct usb_device* udev = cam->usbdev;
u8* data = cam->control_buffer;
int err = 0, res;
if (!cam->sensor)
return -1;
data[0] = data2;
data[1] = data3;
data[2] = data4;
data[3] = data5;
data[4] = data6;
data[5] = data7;
data[6] = data8;
res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x00, 0x41,
0, 0x81, data, n-1, ET61X251_CTRL_TIMEOUT);
if (res < 0)
err += res;
data[0] = address;
data[1] = cam->sensor->i2c_slave_id;
data[2] = cam->sensor->rsta | 0x02 | (n << 4);
res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x00, 0x41,
0, 0x88, data, 3, ET61X251_CTRL_TIMEOUT);
if (res < 0)
err += res;
/* Start writing through the serial interface */
data[0] = data1;
res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x00, 0x41,
0, 0x80, data, 1, ET61X251_CTRL_TIMEOUT);
if (res < 0)
err += res;
err += et61x251_i2c_wait(cam, cam->sensor);
if (err)
DBG(3, "I2C raw write failed for %s image sensor",
cam->sensor->name);
PDBGG("I2C raw write: %u bytes, address = 0x%02X, data1 = 0x%02X, "
"data2 = 0x%02X, data3 = 0x%02X, data4 = 0x%02X, data5 = 0x%02X,"
" data6 = 0x%02X, data7 = 0x%02X, data8 = 0x%02X", n, address,
data1, data2, data3, data4, data5, data6, data7, data8);
return err ? -1 : 0;
}
int et61x251_i2c_read(struct et61x251_device* cam, u8 address)
{
if (!cam->sensor)
return -1;
return et61x251_i2c_try_read(cam, cam->sensor, address);
}
int et61x251_i2c_write(struct et61x251_device* cam, u8 address, u8 value)
{
if (!cam->sensor)
return -1;
return et61x251_i2c_try_write(cam, cam->sensor, address, value);
}
/*****************************************************************************/
static void et61x251_urb_complete(struct urb *urb, struct pt_regs* regs)
{
struct et61x251_device* cam = urb->context;
struct et61x251_frame_t** f;
size_t imagesize;
u8 i;
int err = 0;
if (urb->status == -ENOENT)
return;
f = &cam->frame_current;
if (cam->stream == STREAM_INTERRUPT) {
cam->stream = STREAM_OFF;
if ((*f))
(*f)->state = F_QUEUED;
DBG(3, "Stream interrupted");
wake_up_interruptible(&cam->wait_stream);
}
if (cam->state & DEV_DISCONNECTED)
return;
if (cam->state & DEV_MISCONFIGURED) {
wake_up_interruptible(&cam->wait_frame);
return;
}
if (cam->stream == STREAM_OFF || list_empty(&cam->inqueue))
goto resubmit_urb;
if (!(*f))
(*f) = list_entry(cam->inqueue.next, struct et61x251_frame_t,
frame);
imagesize = (cam->sensor->pix_format.width *
cam->sensor->pix_format.height *
cam->sensor->pix_format.priv) / 8;
for (i = 0; i < urb->number_of_packets; i++) {
unsigned int len, status;
void *pos;
u8* b1, * b2, sof;
const u8 VOID_BYTES = 6;
size_t imglen;
len = urb->iso_frame_desc[i].actual_length;
status = urb->iso_frame_desc[i].status;
pos = urb->iso_frame_desc[i].offset + urb->transfer_buffer;
if (status) {
DBG(3, "Error in isochronous frame");
(*f)->state = F_ERROR;
continue;
}
b1 = pos++;
b2 = pos++;
sof = ((*b1 & 0x3f) == 63);
imglen = ((*b1 & 0xc0) << 2) | *b2;
PDBGG("Isochrnous frame: length %u, #%u i, image length %zu",
len, i, imglen);
if ((*f)->state == F_QUEUED || (*f)->state == F_ERROR)
start_of_frame:
if (sof) {
(*f)->state = F_GRABBING;
(*f)->buf.bytesused = 0;
do_gettimeofday(&(*f)->buf.timestamp);
pos += 22;
DBG(3, "SOF detected: new video frame");
}
if ((*f)->state == F_GRABBING) {
if (sof && (*f)->buf.bytesused) {
if (cam->sensor->pix_format.pixelformat ==
V4L2_PIX_FMT_ET61X251)
goto end_of_frame;
else {
DBG(3, "Not expected SOF detected "
"after %lu bytes",
(unsigned long)(*f)->buf.bytesused);
(*f)->state = F_ERROR;
continue;
}
}
if ((*f)->buf.bytesused + imglen > imagesize) {
DBG(3, "Video frame size exceeded");
(*f)->state = F_ERROR;
continue;
}
pos += VOID_BYTES;
memcpy((*f)->bufmem+(*f)->buf.bytesused, pos, imglen);
(*f)->buf.bytesused += imglen;
if ((*f)->buf.bytesused == imagesize) {
u32 b;
end_of_frame:
b = (*f)->buf.bytesused;
(*f)->state = F_DONE;
(*f)->buf.sequence= ++cam->frame_count;
spin_lock(&cam->queue_lock);
list_move_tail(&(*f)->frame, &cam->outqueue);
if (!list_empty(&cam->inqueue))
(*f) = list_entry(cam->inqueue.next,
struct et61x251_frame_t,
frame);
else
(*f) = NULL;
spin_unlock(&cam->queue_lock);
DBG(3, "Video frame captured: : %lu bytes",
(unsigned long)(b));
if (!(*f))
goto resubmit_urb;
if (sof &&
cam->sensor->pix_format.pixelformat ==
V4L2_PIX_FMT_ET61X251)
goto start_of_frame;
}
}
}
resubmit_urb:
urb->dev = cam->usbdev;
err = usb_submit_urb(urb, GFP_ATOMIC);
if (err < 0 && err != -EPERM) {
cam->state |= DEV_MISCONFIGURED;
DBG(1, "usb_submit_urb() failed");
}
wake_up_interruptible(&cam->wait_frame);
}
static int et61x251_start_transfer(struct et61x251_device* cam)
{
struct usb_device *udev = cam->usbdev;
struct urb* urb;
const unsigned int wMaxPacketSize[] = {0, 256, 384, 512, 640, 768, 832,
864, 896, 920, 956, 980, 1000,
1022};
const unsigned int psz = wMaxPacketSize[ET61X251_ALTERNATE_SETTING];
s8 i, j;
int err = 0;
for (i = 0; i < ET61X251_URBS; i++) {
cam->transfer_buffer[i] = kzalloc(ET61X251_ISO_PACKETS * psz,
GFP_KERNEL);
if (!cam->transfer_buffer[i]) {
err = -ENOMEM;
DBG(1, "Not enough memory");
goto free_buffers;
}
}
for (i = 0; i < ET61X251_URBS; i++) {
urb = usb_alloc_urb(ET61X251_ISO_PACKETS, GFP_KERNEL);
cam->urb[i] = urb;
if (!urb) {
err = -ENOMEM;
DBG(1, "usb_alloc_urb() failed");
goto free_urbs;
}
urb->dev = udev;
urb->context = cam;
urb->pipe = usb_rcvisocpipe(udev, 1);
urb->transfer_flags = URB_ISO_ASAP;
urb->number_of_packets = ET61X251_ISO_PACKETS;
urb->complete = et61x251_urb_complete;
urb->transfer_buffer = cam->transfer_buffer[i];
urb->transfer_buffer_length = psz * ET61X251_ISO_PACKETS;
urb->interval = 1;
for (j = 0; j < ET61X251_ISO_PACKETS; j++) {
urb->iso_frame_desc[j].offset = psz * j;
urb->iso_frame_desc[j].length = psz;
}
}
err = et61x251_write_reg(cam, 0x01, 0x03);
err = et61x251_write_reg(cam, 0x00, 0x03);
err = et61x251_write_reg(cam, 0x08, 0x03);
if (err) {
err = -EIO;
DBG(1, "I/O hardware error");
goto free_urbs;
}
err = usb_set_interface(udev, 0, ET61X251_ALTERNATE_SETTING);
if (err) {
DBG(1, "usb_set_interface() failed");
goto free_urbs;
}
cam->frame_current = NULL;
for (i = 0; i < ET61X251_URBS; i++) {
err = usb_submit_urb(cam->urb[i], GFP_KERNEL);
if (err) {
for (j = i-1; j >= 0; j--)
usb_kill_urb(cam->urb[j]);
DBG(1, "usb_submit_urb() failed, error %d", err);
goto free_urbs;
}
}
return 0;
free_urbs:
for (i = 0; (i < ET61X251_URBS) && cam->urb[i]; i++)
usb_free_urb(cam->urb[i]);
free_buffers:
for (i = 0; (i < ET61X251_URBS) && cam->transfer_buffer[i]; i++)
kfree(cam->transfer_buffer[i]);
return err;
}
static int et61x251_stop_transfer(struct et61x251_device* cam)
{
struct usb_device *udev = cam->usbdev;
s8 i;
int err = 0;
if (cam->state & DEV_DISCONNECTED)
return 0;
for (i = ET61X251_URBS-1; i >= 0; i--) {
usb_kill_urb(cam->urb[i]);
usb_free_urb(cam->urb[i]);
kfree(cam->transfer_buffer[i]);
}
err = usb_set_interface(udev, 0, 0); /* 0 Mb/s */
if (err)
DBG(3, "usb_set_interface() failed");
return err;
}
static int et61x251_stream_interrupt(struct et61x251_device* cam)
{
int err = 0;
cam->stream = STREAM_INTERRUPT;
err = wait_event_timeout(cam->wait_stream,
(cam->stream == STREAM_OFF) ||
(cam->state & DEV_DISCONNECTED),
ET61X251_URB_TIMEOUT);
if (cam->state & DEV_DISCONNECTED)
return -ENODEV;
else if (err) {
cam->state |= DEV_MISCONFIGURED;
DBG(1, "URB timeout reached. The camera is misconfigured. To "
"use it, close and open /dev/video%d again.",
cam->v4ldev->minor);
return err;
}
return 0;
}
/*****************************************************************************/
#ifdef CONFIG_VIDEO_ADV_DEBUG
static u8 et61x251_strtou8(const char* buff, size_t len, ssize_t* count)
{
char str[5];
char* endp;
unsigned long val;
if (len < 4) {
strncpy(str, buff, len);
str[len+1] = '\0';
} else {
strncpy(str, buff, 4);
str[4] = '\0';
}
val = simple_strtoul(str, &endp, 0);
*count = 0;
if (val <= 0xff)
*count = (ssize_t)(endp - str);
if ((*count) && (len == *count+1) && (buff[*count] == '\n'))
*count += 1;
return (u8)val;
}
/*
NOTE 1: being inside one of the following methods implies that the v4l
device exists for sure (see kobjects and reference counters)
NOTE 2: buffers are PAGE_SIZE long
*/
static ssize_t et61x251_show_reg(struct class_device* cd, char* buf)
{
struct et61x251_device* cam;
ssize_t count;
if (down_interruptible(&et61x251_sysfs_lock))
return -ERESTARTSYS;
cam = video_get_drvdata(to_video_device(cd));
if (!cam) {
up(&et61x251_sysfs_lock);
return -ENODEV;
}
count = sprintf(buf, "%u\n", cam->sysfs.reg);
up(&et61x251_sysfs_lock);
return count;
}
static ssize_t
et61x251_store_reg(struct class_device* cd, const char* buf, size_t len)
{
struct et61x251_device* cam;
u8 index;
ssize_t count;
if (down_interruptible(&et61x251_sysfs_lock))
return -ERESTARTSYS;
cam = video_get_drvdata(to_video_device(cd));
if (!cam) {
up(&et61x251_sysfs_lock);
return -ENODEV;
}
index = et61x251_strtou8(buf, len, &count);
if (index > 0x8e || !count) {
up(&et61x251_sysfs_lock);
return -EINVAL;
}
cam->sysfs.reg = index;
DBG(2, "Moved ET61X[12]51 register index to 0x%02X", cam->sysfs.reg);
DBG(3, "Written bytes: %zd", count);
up(&et61x251_sysfs_lock);
return count;
}
static ssize_t et61x251_show_val(struct class_device* cd, char* buf)
{
struct et61x251_device* cam;
ssize_t count;
int val;
if (down_interruptible(&et61x251_sysfs_lock))
return -ERESTARTSYS;
cam = video_get_drvdata(to_video_device(cd));
if (!cam) {
up(&et61x251_sysfs_lock);
return -ENODEV;
}
if ((val = et61x251_read_reg(cam, cam->sysfs.reg)) < 0) {
up(&et61x251_sysfs_lock);
return -EIO;
}
count = sprintf(buf, "%d\n", val);
DBG(3, "Read bytes: %zd", count);
up(&et61x251_sysfs_lock);
return count;
}
static ssize_t
et61x251_store_val(struct class_device* cd, const char* buf, size_t len)
{
struct et61x251_device* cam;
u8 value;
ssize_t count;
int err;
if (down_interruptible(&et61x251_sysfs_lock))
return -ERESTARTSYS;
cam = video_get_drvdata(to_video_device(cd));
if (!cam) {
up(&et61x251_sysfs_lock);
return -ENODEV;
}
value = et61x251_strtou8(buf, len, &count);
if (!count) {
up(&et61x251_sysfs_lock);
return -EINVAL;
}
err = et61x251_write_reg(cam, value, cam->sysfs.reg);
if (err) {
up(&et61x251_sysfs_lock);
return -EIO;
}
DBG(2, "Written ET61X[12]51 reg. 0x%02X, val. 0x%02X",
cam->sysfs.reg, value);
DBG(3, "Written bytes: %zd", count);
up(&et61x251_sysfs_lock);
return count;
}
static ssize_t et61x251_show_i2c_reg(struct class_device* cd, char* buf)
{
struct et61x251_device* cam;
ssize_t count;
if (down_interruptible(&et61x251_sysfs_lock))
return -ERESTARTSYS;
cam = video_get_drvdata(to_video_device(cd));
if (!cam) {
up(&et61x251_sysfs_lock);
return -ENODEV;
}
count = sprintf(buf, "%u\n", cam->sysfs.i2c_reg);
DBG(3, "Read bytes: %zd", count);
up(&et61x251_sysfs_lock);
return count;
}
static ssize_t
et61x251_store_i2c_reg(struct class_device* cd, const char* buf, size_t len)
{
struct et61x251_device* cam;
u8 index;
ssize_t count;
if (down_interruptible(&et61x251_sysfs_lock))
return -ERESTARTSYS;
cam = video_get_drvdata(to_video_device(cd));
if (!cam) {
up(&et61x251_sysfs_lock);
return -ENODEV;
}
index = et61x251_strtou8(buf, len, &count);
if (!count) {
up(&et61x251_sysfs_lock);
return -EINVAL;
}
cam->sysfs.i2c_reg = index;
DBG(2, "Moved sensor register index to 0x%02X", cam->sysfs.i2c_reg);
DBG(3, "Written bytes: %zd", count);
up(&et61x251_sysfs_lock);
return count;
}
static ssize_t et61x251_show_i2c_val(struct class_device* cd, char* buf)
{
struct et61x251_device* cam;
ssize_t count;
int val;
if (down_interruptible(&et61x251_sysfs_lock))
return -ERESTARTSYS;
cam = video_get_drvdata(to_video_device(cd));
if (!cam) {
up(&et61x251_sysfs_lock);
return -ENODEV;
}
if (!(cam->sensor->sysfs_ops & ET61X251_I2C_READ)) {
up(&et61x251_sysfs_lock);
return -ENOSYS;
}
if ((val = et61x251_i2c_read(cam, cam->sysfs.i2c_reg)) < 0) {
up(&et61x251_sysfs_lock);
return -EIO;
}
count = sprintf(buf, "%d\n", val);
DBG(3, "Read bytes: %zd", count);
up(&et61x251_sysfs_lock);
return count;
}
static ssize_t
et61x251_store_i2c_val(struct class_device* cd, const char* buf, size_t len)
{
struct et61x251_device* cam;
u8 value;
ssize_t count;
int err;
if (down_interruptible(&et61x251_sysfs_lock))
return -ERESTARTSYS;
cam = video_get_drvdata(to_video_device(cd));
if (!cam) {
up(&et61x251_sysfs_lock);
return -ENODEV;
}
if (!(cam->sensor->sysfs_ops & ET61X251_I2C_READ)) {
up(&et61x251_sysfs_lock);
return -ENOSYS;
}
value = et61x251_strtou8(buf, len, &count);
if (!count) {
up(&et61x251_sysfs_lock);
return -EINVAL;
}
err = et61x251_i2c_write(cam, cam->sysfs.i2c_reg, value);
if (err) {
up(&et61x251_sysfs_lock);
return -EIO;
}
DBG(2, "Written sensor reg. 0x%02X, val. 0x%02X",
cam->sysfs.i2c_reg, value);
DBG(3, "Written bytes: %zd", count);
up(&et61x251_sysfs_lock);
return count;
}
static CLASS_DEVICE_ATTR(reg, S_IRUGO | S_IWUSR,
et61x251_show_reg, et61x251_store_reg);
static CLASS_DEVICE_ATTR(val, S_IRUGO | S_IWUSR,
et61x251_show_val, et61x251_store_val);
static CLASS_DEVICE_ATTR(i2c_reg, S_IRUGO | S_IWUSR,
et61x251_show_i2c_reg, et61x251_store_i2c_reg);
static CLASS_DEVICE_ATTR(i2c_val, S_IRUGO | S_IWUSR,
et61x251_show_i2c_val, et61x251_store_i2c_val);
static void et61x251_create_sysfs(struct et61x251_device* cam)
{
struct video_device *v4ldev = cam->v4ldev;
video_device_create_file(v4ldev, &class_device_attr_reg);
video_device_create_file(v4ldev, &class_device_attr_val);
if (cam->sensor && cam->sensor->sysfs_ops) {
video_device_create_file(v4ldev, &class_device_attr_i2c_reg);
video_device_create_file(v4ldev, &class_device_attr_i2c_val);
}
}
#endif /* CONFIG_VIDEO_ADV_DEBUG */
/*****************************************************************************/
static int
et61x251_set_pix_format(struct et61x251_device* cam,
struct v4l2_pix_format* pix)
{
int r, err = 0;
if ((r = et61x251_read_reg(cam, 0x12)) < 0)
err += r;
if (pix->pixelformat == V4L2_PIX_FMT_ET61X251)
err += et61x251_write_reg(cam, r & 0xfd, 0x12);
else
err += et61x251_write_reg(cam, r | 0x02, 0x12);
return err ? -EIO : 0;
}
static int
et61x251_set_compression(struct et61x251_device* cam,
struct v4l2_jpegcompression* compression)
{
int r, err = 0;
if ((r = et61x251_read_reg(cam, 0x12)) < 0)
err += r;
if (compression->quality == 0)
err += et61x251_write_reg(cam, r & 0xfb, 0x12);
else
err += et61x251_write_reg(cam, r | 0x04, 0x12);
return err ? -EIO : 0;
}
static int et61x251_set_scale(struct et61x251_device* cam, u8 scale)
{
int r = 0, err = 0;
r = et61x251_read_reg(cam, 0x12);
if (r < 0)
err += r;
if (scale == 1)
err += et61x251_write_reg(cam, r & ~0x01, 0x12);
else if (scale == 2)
err += et61x251_write_reg(cam, r | 0x01, 0x12);
if (err)
return -EIO;
PDBGG("Scaling factor: %u", scale);
return 0;
}
static int
et61x251_set_crop(struct et61x251_device* cam, struct v4l2_rect* rect)
{
struct et61x251_sensor* s = cam->sensor;
u16 fmw_sx = (u16)(rect->left - s->cropcap.bounds.left +
s->active_pixel.left),
fmw_sy = (u16)(rect->top - s->cropcap.bounds.top +
s->active_pixel.top),
fmw_length = (u16)(rect->width),
fmw_height = (u16)(rect->height);
int err = 0;
err += et61x251_write_reg(cam, fmw_sx & 0xff, 0x69);
err += et61x251_write_reg(cam, fmw_sy & 0xff, 0x6a);
err += et61x251_write_reg(cam, fmw_length & 0xff, 0x6b);
err += et61x251_write_reg(cam, fmw_height & 0xff, 0x6c);
err += et61x251_write_reg(cam, (fmw_sx >> 8) | ((fmw_sy & 0x300) >> 6)
| ((fmw_length & 0x300) >> 4)
| ((fmw_height & 0x300) >> 2), 0x6d);
if (err)
return -EIO;
PDBGG("fmw_sx, fmw_sy, fmw_length, fmw_height: %u %u %u %u",
fmw_sx, fmw_sy, fmw_length, fmw_height);
return 0;
}
static int et61x251_init(struct et61x251_device* cam)
{
struct et61x251_sensor* s = cam->sensor;
struct v4l2_control ctrl;
struct v4l2_queryctrl *qctrl;
struct v4l2_rect* rect;
u8 i = 0;
int err = 0;
if (!(cam->state & DEV_INITIALIZED)) {
init_waitqueue_head(&cam->open);
qctrl = s->qctrl;
rect = &(s->cropcap.defrect);
cam->compression.quality = ET61X251_COMPRESSION_QUALITY;
} else { /* use current values */
qctrl = s->_qctrl;
rect = &(s->_rect);
}
err += et61x251_set_scale(cam, rect->width / s->pix_format.width);
err += et61x251_set_crop(cam, rect);
if (err)
return err;
if (s->init) {
err = s->init(cam);
if (err) {
DBG(3, "Sensor initialization failed");
return err;
}
}
err += et61x251_set_compression(cam, &cam->compression);
err += et61x251_set_pix_format(cam, &s->pix_format);
if (s->set_pix_format)
err += s->set_pix_format(cam, &s->pix_format);
if (err)
return err;
if (s->pix_format.pixelformat == V4L2_PIX_FMT_ET61X251)
DBG(3, "Compressed video format is active, quality %d",
cam->compression.quality);
else
DBG(3, "Uncompressed video format is active");
if (s->set_crop)
if ((err = s->set_crop(cam, rect))) {
DBG(3, "set_crop() failed");
return err;
}
if (s->set_ctrl) {
for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
if (s->qctrl[i].id != 0 &&
!(s->qctrl[i].flags & V4L2_CTRL_FLAG_DISABLED)) {
ctrl.id = s->qctrl[i].id;
ctrl.value = qctrl[i].default_value;
err = s->set_ctrl(cam, &ctrl);
if (err) {
DBG(3, "Set %s control failed",
s->qctrl[i].name);
return err;
}
DBG(3, "Image sensor supports '%s' control",
s->qctrl[i].name);
}
}
if (!(cam->state & DEV_INITIALIZED)) {
init_MUTEX(&cam->fileop_sem);
spin_lock_init(&cam->queue_lock);
init_waitqueue_head(&cam->wait_frame);
init_waitqueue_head(&cam->wait_stream);
cam->nreadbuffers = 2;
memcpy(s->_qctrl, s->qctrl, sizeof(s->qctrl));
memcpy(&(s->_rect), &(s->cropcap.defrect),
sizeof(struct v4l2_rect));
cam->state |= DEV_INITIALIZED;
}
DBG(2, "Initialization succeeded");
return 0;
}
static void et61x251_release_resources(struct et61x251_device* cam)
{
down(&et61x251_sysfs_lock);
DBG(2, "V4L2 device /dev/video%d deregistered", cam->v4ldev->minor);
video_set_drvdata(cam->v4ldev, NULL);
video_unregister_device(cam->v4ldev);
up(&et61x251_sysfs_lock);
kfree(cam->control_buffer);
}
/*****************************************************************************/
static int et61x251_open(struct inode* inode, struct file* filp)
{
struct et61x251_device* cam;
int err = 0;
/*
This is the only safe way to prevent race conditions with
disconnect
*/
if (!down_read_trylock(&et61x251_disconnect))
return -ERESTARTSYS;
cam = video_get_drvdata(video_devdata(filp));
if (down_interruptible(&cam->dev_sem)) {
up_read(&et61x251_disconnect);
return -ERESTARTSYS;
}
if (cam->users) {
DBG(2, "Device /dev/video%d is busy...", cam->v4ldev->minor);
if ((filp->f_flags & O_NONBLOCK) ||
(filp->f_flags & O_NDELAY)) {
err = -EWOULDBLOCK;
goto out;
}
up(&cam->dev_sem);
err = wait_event_interruptible_exclusive(cam->open,
cam->state & DEV_DISCONNECTED
|| !cam->users);
if (err) {
up_read(&et61x251_disconnect);
return err;
}
if (cam->state & DEV_DISCONNECTED) {
up_read(&et61x251_disconnect);
return -ENODEV;
}
down(&cam->dev_sem);
}
if (cam->state & DEV_MISCONFIGURED) {
err = et61x251_init(cam);
if (err) {
DBG(1, "Initialization failed again. "
"I will retry on next open().");
goto out;
}
cam->state &= ~DEV_MISCONFIGURED;
}
if ((err = et61x251_start_transfer(cam)))
goto out;
filp->private_data = cam;
cam->users++;
cam->io = IO_NONE;
cam->stream = STREAM_OFF;
cam->nbuffers = 0;
cam->frame_count = 0;
et61x251_empty_framequeues(cam);
DBG(3, "Video device /dev/video%d is open", cam->v4ldev->minor);
out:
up(&cam->dev_sem);
up_read(&et61x251_disconnect);
return err;
}
static int et61x251_release(struct inode* inode, struct file* filp)
{
struct et61x251_device* cam = video_get_drvdata(video_devdata(filp));
down(&cam->dev_sem); /* prevent disconnect() to be called */
et61x251_stop_transfer(cam);
et61x251_release_buffers(cam);
if (cam->state & DEV_DISCONNECTED) {
et61x251_release_resources(cam);
up(&cam->dev_sem);
kfree(cam);
return 0;
}
cam->users--;
wake_up_interruptible_nr(&cam->open, 1);
DBG(3, "Video device /dev/video%d closed", cam->v4ldev->minor);
up(&cam->dev_sem);
return 0;
}
static ssize_t
et61x251_read(struct file* filp, char __user * buf,
size_t count, loff_t* f_pos)
{
struct et61x251_device* cam = video_get_drvdata(video_devdata(filp));
struct et61x251_frame_t* f, * i;
unsigned long lock_flags;
int err = 0;
if (down_interruptible(&cam->fileop_sem))
return -ERESTARTSYS;
if (cam->state & DEV_DISCONNECTED) {
DBG(1, "Device not present");
up(&cam->fileop_sem);
return -ENODEV;
}
if (cam->state & DEV_MISCONFIGURED) {
DBG(1, "The camera is misconfigured. Close and open it "
"again.");
up(&cam->fileop_sem);
return -EIO;
}
if (cam->io == IO_MMAP) {
DBG(3, "Close and open the device again to choose the read "
"method");
up(&cam->fileop_sem);
return -EINVAL;
}
if (cam->io == IO_NONE) {
if (!et61x251_request_buffers(cam, cam->nreadbuffers,
IO_READ)) {
DBG(1, "read() failed, not enough memory");
up(&cam->fileop_sem);
return -ENOMEM;
}
cam->io = IO_READ;
cam->stream = STREAM_ON;
}
if (list_empty(&cam->inqueue)) {
if (!list_empty(&cam->outqueue))
et61x251_empty_framequeues(cam);
et61x251_queue_unusedframes(cam);
}
if (!count) {
up(&cam->fileop_sem);
return 0;
}
if (list_empty(&cam->outqueue)) {
if (filp->f_flags & O_NONBLOCK) {
up(&cam->fileop_sem);
return -EAGAIN;
}
err = wait_event_interruptible
( cam->wait_frame,
(!list_empty(&cam->outqueue)) ||
(cam->state & DEV_DISCONNECTED) ||
(cam->state & DEV_MISCONFIGURED) );
if (err) {
up(&cam->fileop_sem);
return err;
}
if (cam->state & DEV_DISCONNECTED) {
up(&cam->fileop_sem);
return -ENODEV;
}
if (cam->state & DEV_MISCONFIGURED) {
up(&cam->fileop_sem);
return -EIO;
}
}
f = list_entry(cam->outqueue.prev, struct et61x251_frame_t, frame);
if (count > f->buf.bytesused)
count = f->buf.bytesused;
if (copy_to_user(buf, f->bufmem, count)) {
err = -EFAULT;
goto exit;
}
*f_pos += count;
exit:
spin_lock_irqsave(&cam->queue_lock, lock_flags);
list_for_each_entry(i, &cam->outqueue, frame)
i->state = F_UNUSED;
INIT_LIST_HEAD(&cam->outqueue);
spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
et61x251_queue_unusedframes(cam);
PDBGG("Frame #%lu, bytes read: %zu",
(unsigned long)f->buf.index, count);
up(&cam->fileop_sem);
return err ? err : count;
}
static unsigned int et61x251_poll(struct file *filp, poll_table *wait)
{
struct et61x251_device* cam = video_get_drvdata(video_devdata(filp));
struct et61x251_frame_t* f;
unsigned long lock_flags;
unsigned int mask = 0;
if (down_interruptible(&cam->fileop_sem))
return POLLERR;
if (cam->state & DEV_DISCONNECTED) {
DBG(1, "Device not present");
goto error;
}
if (cam->state & DEV_MISCONFIGURED) {
DBG(1, "The camera is misconfigured. Close and open it "
"again.");
goto error;
}
if (cam->io == IO_NONE) {
if (!et61x251_request_buffers(cam, cam->nreadbuffers,
IO_READ)) {
DBG(1, "poll() failed, not enough memory");
goto error;
}
cam->io = IO_READ;
cam->stream = STREAM_ON;
}
if (cam->io == IO_READ) {
spin_lock_irqsave(&cam->queue_lock, lock_flags);
list_for_each_entry(f, &cam->outqueue, frame)
f->state = F_UNUSED;
INIT_LIST_HEAD(&cam->outqueue);
spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
et61x251_queue_unusedframes(cam);
}
poll_wait(filp, &cam->wait_frame, wait);
if (!list_empty(&cam->outqueue))
mask |= POLLIN | POLLRDNORM;
up(&cam->fileop_sem);
return mask;
error:
up(&cam->fileop_sem);
return POLLERR;
}
static void et61x251_vm_open(struct vm_area_struct* vma)
{
struct et61x251_frame_t* f = vma->vm_private_data;
f->vma_use_count++;
}
static void et61x251_vm_close(struct vm_area_struct* vma)
{
/* NOTE: buffers are not freed here */
struct et61x251_frame_t* f = vma->vm_private_data;
f->vma_use_count--;
}
static struct vm_operations_struct et61x251_vm_ops = {
.open = et61x251_vm_open,
.close = et61x251_vm_close,
};
static int et61x251_mmap(struct file* filp, struct vm_area_struct *vma)
{
struct et61x251_device* cam = video_get_drvdata(video_devdata(filp));
unsigned long size = vma->vm_end - vma->vm_start,
start = vma->vm_start;
void *pos;
u32 i;
if (down_interruptible(&cam->fileop_sem))
return -ERESTARTSYS;
if (cam->state & DEV_DISCONNECTED) {
DBG(1, "Device not present");
up(&cam->fileop_sem);
return -ENODEV;
}
if (cam->state & DEV_MISCONFIGURED) {
DBG(1, "The camera is misconfigured. Close and open it "
"again.");
up(&cam->fileop_sem);
return -EIO;
}
if (cam->io != IO_MMAP || !(vma->vm_flags & VM_WRITE) ||
size != PAGE_ALIGN(cam->frame[0].buf.length)) {
up(&cam->fileop_sem);
return -EINVAL;
}
for (i = 0; i < cam->nbuffers; i++) {
if ((cam->frame[i].buf.m.offset>>PAGE_SHIFT) == vma->vm_pgoff)
break;
}
if (i == cam->nbuffers) {
up(&cam->fileop_sem);
return -EINVAL;
}
vma->vm_flags |= VM_IO;
vma->vm_flags |= VM_RESERVED;
pos = cam->frame[i].bufmem;
while (size > 0) { /* size is page-aligned */
if (vm_insert_page(vma, start, vmalloc_to_page(pos))) {
up(&cam->fileop_sem);
return -EAGAIN;
}
start += PAGE_SIZE;
pos += PAGE_SIZE;
size -= PAGE_SIZE;
}
vma->vm_ops = &et61x251_vm_ops;
vma->vm_private_data = &cam->frame[i];
et61x251_vm_open(vma);
up(&cam->fileop_sem);
return 0;
}
/*****************************************************************************/
static int
et61x251_vidioc_querycap(struct et61x251_device* cam, void __user * arg)
{
struct v4l2_capability cap = {
.driver = "et61x251",
.version = ET61X251_MODULE_VERSION_CODE,
.capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE |
V4L2_CAP_STREAMING,
};
strlcpy(cap.card, cam->v4ldev->name, sizeof(cap.card));
if (usb_make_path(cam->usbdev, cap.bus_info, sizeof(cap.bus_info)) < 0)
strlcpy(cap.bus_info, cam->usbdev->dev.bus_id,
sizeof(cap.bus_info));
if (copy_to_user(arg, &cap, sizeof(cap)))
return -EFAULT;
return 0;
}
static int
et61x251_vidioc_enuminput(struct et61x251_device* cam, void __user * arg)
{
struct v4l2_input i;
if (copy_from_user(&i, arg, sizeof(i)))
return -EFAULT;
if (i.index)
return -EINVAL;
memset(&i, 0, sizeof(i));
strcpy(i.name, "Camera");
if (copy_to_user(arg, &i, sizeof(i)))
return -EFAULT;
return 0;
}
static int
et61x251_vidioc_gs_input(struct et61x251_device* cam, void __user * arg)
{
int index;
if (copy_from_user(&index, arg, sizeof(index)))
return -EFAULT;
if (index != 0)
return -EINVAL;
return 0;
}
static int
et61x251_vidioc_query_ctrl(struct et61x251_device* cam, void __user * arg)
{
struct et61x251_sensor* s = cam->sensor;
struct v4l2_queryctrl qc;
u8 i;
if (copy_from_user(&qc, arg, sizeof(qc)))
return -EFAULT;
for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
if (qc.id && qc.id == s->qctrl[i].id) {
memcpy(&qc, &(s->qctrl[i]), sizeof(qc));
if (copy_to_user(arg, &qc, sizeof(qc)))
return -EFAULT;
return 0;
}
return -EINVAL;
}
static int
et61x251_vidioc_g_ctrl(struct et61x251_device* cam, void __user * arg)
{
struct et61x251_sensor* s = cam->sensor;
struct v4l2_control ctrl;
int err = 0;
u8 i;
if (!s->get_ctrl && !s->set_ctrl)
return -EINVAL;
if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
return -EFAULT;
if (!s->get_ctrl) {
for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
if (ctrl.id == s->qctrl[i].id) {
ctrl.value = s->_qctrl[i].default_value;
goto exit;
}
return -EINVAL;
} else
err = s->get_ctrl(cam, &ctrl);
exit:
if (copy_to_user(arg, &ctrl, sizeof(ctrl)))
return -EFAULT;
return err;
}
static int
et61x251_vidioc_s_ctrl(struct et61x251_device* cam, void __user * arg)
{
struct et61x251_sensor* s = cam->sensor;
struct v4l2_control ctrl;
u8 i;
int err = 0;
if (!s->set_ctrl)
return -EINVAL;
if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
return -EFAULT;
for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
if (ctrl.id == s->qctrl[i].id) {
if (ctrl.value < s->qctrl[i].minimum ||
ctrl.value > s->qctrl[i].maximum)
return -ERANGE;
ctrl.value -= ctrl.value % s->qctrl[i].step;
break;
}
if ((err = s->set_ctrl(cam, &ctrl)))
return err;
s->_qctrl[i].default_value = ctrl.value;
return 0;
}
static int
et61x251_vidioc_cropcap(struct et61x251_device* cam, void __user * arg)
{
struct v4l2_cropcap* cc = &(cam->sensor->cropcap);
cc->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
cc->pixelaspect.numerator = 1;
cc->pixelaspect.denominator = 1;
if (copy_to_user(arg, cc, sizeof(*cc)))
return -EFAULT;
return 0;
}
static int
et61x251_vidioc_g_crop(struct et61x251_device* cam, void __user * arg)
{
struct et61x251_sensor* s = cam->sensor;
struct v4l2_crop crop = {
.type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
};
memcpy(&(crop.c), &(s->_rect), sizeof(struct v4l2_rect));
if (copy_to_user(arg, &crop, sizeof(crop)))
return -EFAULT;
return 0;
}
static int
et61x251_vidioc_s_crop(struct et61x251_device* cam, void __user * arg)
{
struct et61x251_sensor* s = cam->sensor;
struct v4l2_crop crop;
struct v4l2_rect* rect;
struct v4l2_rect* bounds = &(s->cropcap.bounds);
struct v4l2_pix_format* pix_format = &(s->pix_format);
u8 scale;
const enum et61x251_stream_state stream = cam->stream;
const u32 nbuffers = cam->nbuffers;
u32 i;
int err = 0;
if (copy_from_user(&crop, arg, sizeof(crop)))
return -EFAULT;
rect = &(crop.c);
if (crop.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
if (cam->module_param.force_munmap)
for (i = 0; i < cam->nbuffers; i++)
if (cam->frame[i].vma_use_count) {
DBG(3, "VIDIOC_S_CROP failed. "
"Unmap the buffers first.");
return -EINVAL;
}
/* Preserve R,G or B origin */
rect->left = (s->_rect.left & 1L) ? rect->left | 1L : rect->left & ~1L;
rect->top = (s->_rect.top & 1L) ? rect->top | 1L : rect->top & ~1L;
if (rect->width < 4)
rect->width = 4;
if (rect->height < 4)
rect->height = 4;
if (rect->width > bounds->width)
rect->width = bounds->width;
if (rect->height > bounds->height)
rect->height = bounds->height;
if (rect->left < bounds->left)
rect->left = bounds->left;
if (rect->top < bounds->top)
rect->top = bounds->top;
if (rect->left + rect->width > bounds->left + bounds->width)
rect->left = bounds->left+bounds->width - rect->width;
if (rect->top + rect->height > bounds->top + bounds->height)
rect->top = bounds->top+bounds->height - rect->height;
rect->width &= ~3L;
rect->height &= ~3L;
if (ET61X251_PRESERVE_IMGSCALE) {
/* Calculate the actual scaling factor */
u32 a, b;
a = rect->width * rect->height;
b = pix_format->width * pix_format->height;
scale = b ? (u8)((a / b) < 4 ? 1 : 2) : 1;
} else
scale = 1;
if (cam->stream == STREAM_ON)
if ((err = et61x251_stream_interrupt(cam)))
return err;
if (copy_to_user(arg, &crop, sizeof(crop))) {
cam->stream = stream;
return -EFAULT;
}
if (cam->module_param.force_munmap || cam->io == IO_READ)
et61x251_release_buffers(cam);
err = et61x251_set_crop(cam, rect);
if (s->set_crop)
err += s->set_crop(cam, rect);
err += et61x251_set_scale(cam, scale);
if (err) { /* atomic, no rollback in ioctl() */
cam->state |= DEV_MISCONFIGURED;
DBG(1, "VIDIOC_S_CROP failed because of hardware problems. To "
"use the camera, close and open /dev/video%d again.",
cam->v4ldev->minor);
return -EIO;
}
s->pix_format.width = rect->width/scale;
s->pix_format.height = rect->height/scale;
memcpy(&(s->_rect), rect, sizeof(*rect));
if ((cam->module_param.force_munmap || cam->io == IO_READ) &&
nbuffers != et61x251_request_buffers(cam, nbuffers, cam->io)) {
cam->state |= DEV_MISCONFIGURED;
DBG(1, "VIDIOC_S_CROP failed because of not enough memory. To "
"use the camera, close and open /dev/video%d again.",
cam->v4ldev->minor);
return -ENOMEM;
}
if (cam->io == IO_READ)
et61x251_empty_framequeues(cam);
else if (cam->module_param.force_munmap)
et61x251_requeue_outqueue(cam);
cam->stream = stream;
return 0;
}
static int
et61x251_vidioc_enum_fmt(struct et61x251_device* cam, void __user * arg)
{
struct v4l2_fmtdesc fmtd;
if (copy_from_user(&fmtd, arg, sizeof(fmtd)))
return -EFAULT;
if (fmtd.index == 0) {
strcpy(fmtd.description, "bayer rgb");
fmtd.pixelformat = V4L2_PIX_FMT_SBGGR8;
} else if (fmtd.index == 1) {
strcpy(fmtd.description, "compressed");
fmtd.pixelformat = V4L2_PIX_FMT_ET61X251;
fmtd.flags = V4L2_FMT_FLAG_COMPRESSED;
} else
return -EINVAL;
fmtd.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
memset(&fmtd.reserved, 0, sizeof(fmtd.reserved));
if (copy_to_user(arg, &fmtd, sizeof(fmtd)))
return -EFAULT;
return 0;
}
static int
et61x251_vidioc_g_fmt(struct et61x251_device* cam, void __user * arg)
{
struct v4l2_format format;
struct v4l2_pix_format* pfmt = &(cam->sensor->pix_format);
if (copy_from_user(&format, arg, sizeof(format)))
return -EFAULT;
if (format.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
pfmt->bytesperline = (pfmt->pixelformat==V4L2_PIX_FMT_ET61X251)
? 0 : (pfmt->width * pfmt->priv) / 8;
pfmt->sizeimage = pfmt->height * ((pfmt->width*pfmt->priv)/8);
pfmt->field = V4L2_FIELD_NONE;
memcpy(&(format.fmt.pix), pfmt, sizeof(*pfmt));
if (copy_to_user(arg, &format, sizeof(format)))
return -EFAULT;
return 0;
}
static int
et61x251_vidioc_try_s_fmt(struct et61x251_device* cam, unsigned int cmd,
void __user * arg)
{
struct et61x251_sensor* s = cam->sensor;
struct v4l2_format format;
struct v4l2_pix_format* pix;
struct v4l2_pix_format* pfmt = &(s->pix_format);
struct v4l2_rect* bounds = &(s->cropcap.bounds);
struct v4l2_rect rect;
u8 scale;
const enum et61x251_stream_state stream = cam->stream;
const u32 nbuffers = cam->nbuffers;
u32 i;
int err = 0;
if (copy_from_user(&format, arg, sizeof(format)))
return -EFAULT;
pix = &(format.fmt.pix);
if (format.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
memcpy(&rect, &(s->_rect), sizeof(rect));
{ /* calculate the actual scaling factor */
u32 a, b;
a = rect.width * rect.height;
b = pix->width * pix->height;
scale = b ? (u8)((a / b) < 4 ? 1 : 2) : 1;
}
rect.width = scale * pix->width;
rect.height = scale * pix->height;
if (rect.width < 4)
rect.width = 4;
if (rect.height < 4)
rect.height = 4;
if (rect.width > bounds->left + bounds->width - rect.left)
rect.width = bounds->left + bounds->width - rect.left;
if (rect.height > bounds->top + bounds->height - rect.top)
rect.height = bounds->top + bounds->height - rect.top;
rect.width &= ~3L;
rect.height &= ~3L;
{ /* adjust the scaling factor */
u32 a, b;
a = rect.width * rect.height;
b = pix->width * pix->height;
scale = b ? (u8)((a / b) < 4 ? 1 : 2) : 1;
}
pix->width = rect.width / scale;
pix->height = rect.height / scale;
if (pix->pixelformat != V4L2_PIX_FMT_ET61X251 &&
pix->pixelformat != V4L2_PIX_FMT_SBGGR8)
pix->pixelformat = pfmt->pixelformat;
pix->priv = pfmt->priv; /* bpp */
pix->colorspace = pfmt->colorspace;
pix->bytesperline = (pix->pixelformat == V4L2_PIX_FMT_ET61X251)
? 0 : (pix->width * pix->priv) / 8;
pix->sizeimage = pix->height * ((pix->width * pix->priv) / 8);
pix->field = V4L2_FIELD_NONE;
if (cmd == VIDIOC_TRY_FMT) {
if (copy_to_user(arg, &format, sizeof(format)))
return -EFAULT;
return 0;
}
if (cam->module_param.force_munmap)
for (i = 0; i < cam->nbuffers; i++)
if (cam->frame[i].vma_use_count) {
DBG(3, "VIDIOC_S_FMT failed. "
"Unmap the buffers first.");
return -EINVAL;
}
if (cam->stream == STREAM_ON)
if ((err = et61x251_stream_interrupt(cam)))
return err;
if (copy_to_user(arg, &format, sizeof(format))) {
cam->stream = stream;
return -EFAULT;
}
if (cam->module_param.force_munmap || cam->io == IO_READ)
et61x251_release_buffers(cam);
err += et61x251_set_pix_format(cam, pix);
err += et61x251_set_crop(cam, &rect);
if (s->set_pix_format)
err += s->set_pix_format(cam, pix);
if (s->set_crop)
err += s->set_crop(cam, &rect);
err += et61x251_set_scale(cam, scale);
if (err) { /* atomic, no rollback in ioctl() */
cam->state |= DEV_MISCONFIGURED;
DBG(1, "VIDIOC_S_FMT failed because of hardware problems. To "
"use the camera, close and open /dev/video%d again.",
cam->v4ldev->minor);
return -EIO;
}
memcpy(pfmt, pix, sizeof(*pix));
memcpy(&(s->_rect), &rect, sizeof(rect));
if ((cam->module_param.force_munmap || cam->io == IO_READ) &&
nbuffers != et61x251_request_buffers(cam, nbuffers, cam->io)) {
cam->state |= DEV_MISCONFIGURED;
DBG(1, "VIDIOC_S_FMT failed because of not enough memory. To "
"use the camera, close and open /dev/video%d again.",
cam->v4ldev->minor);
return -ENOMEM;
}
if (cam->io == IO_READ)
et61x251_empty_framequeues(cam);
else if (cam->module_param.force_munmap)
et61x251_requeue_outqueue(cam);
cam->stream = stream;
return 0;
}
static int
et61x251_vidioc_g_jpegcomp(struct et61x251_device* cam, void __user * arg)
{
if (copy_to_user(arg, &cam->compression,
sizeof(cam->compression)))
return -EFAULT;
return 0;
}
static int
et61x251_vidioc_s_jpegcomp(struct et61x251_device* cam, void __user * arg)
{
struct v4l2_jpegcompression jc;
const enum et61x251_stream_state stream = cam->stream;
int err = 0;
if (copy_from_user(&jc, arg, sizeof(jc)))
return -EFAULT;
if (jc.quality != 0 && jc.quality != 1)
return -EINVAL;
if (cam->stream == STREAM_ON)
if ((err = et61x251_stream_interrupt(cam)))
return err;
err += et61x251_set_compression(cam, &jc);
if (err) { /* atomic, no rollback in ioctl() */
cam->state |= DEV_MISCONFIGURED;
DBG(1, "VIDIOC_S_JPEGCOMP failed because of hardware "
"problems. To use the camera, close and open "
"/dev/video%d again.", cam->v4ldev->minor);
return -EIO;
}
cam->compression.quality = jc.quality;
cam->stream = stream;
return 0;
}
static int
et61x251_vidioc_reqbufs(struct et61x251_device* cam, void __user * arg)
{
struct v4l2_requestbuffers rb;
u32 i;
int err;
if (copy_from_user(&rb, arg, sizeof(rb)))
return -EFAULT;
if (rb.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
rb.memory != V4L2_MEMORY_MMAP)
return -EINVAL;
if (cam->io == IO_READ) {
DBG(3, "Close and open the device again to choose the mmap "
"I/O method");
return -EINVAL;
}
for (i = 0; i < cam->nbuffers; i++)
if (cam->frame[i].vma_use_count) {
DBG(3, "VIDIOC_REQBUFS failed. "
"Previous buffers are still mapped.");
return -EINVAL;
}
if (cam->stream == STREAM_ON)
if ((err = et61x251_stream_interrupt(cam)))
return err;
et61x251_empty_framequeues(cam);
et61x251_release_buffers(cam);
if (rb.count)
rb.count = et61x251_request_buffers(cam, rb.count, IO_MMAP);
if (copy_to_user(arg, &rb, sizeof(rb))) {
et61x251_release_buffers(cam);
cam->io = IO_NONE;
return -EFAULT;
}
cam->io = rb.count ? IO_MMAP : IO_NONE;
return 0;
}
static int
et61x251_vidioc_querybuf(struct et61x251_device* cam, void __user * arg)
{
struct v4l2_buffer b;
if (copy_from_user(&b, arg, sizeof(b)))
return -EFAULT;
if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
b.index >= cam->nbuffers || cam->io != IO_MMAP)
return -EINVAL;
memcpy(&b, &cam->frame[b.index].buf, sizeof(b));
if (cam->frame[b.index].vma_use_count)
b.flags |= V4L2_BUF_FLAG_MAPPED;
if (cam->frame[b.index].state == F_DONE)
b.flags |= V4L2_BUF_FLAG_DONE;
else if (cam->frame[b.index].state != F_UNUSED)
b.flags |= V4L2_BUF_FLAG_QUEUED;
if (copy_to_user(arg, &b, sizeof(b)))
return -EFAULT;
return 0;
}
static int
et61x251_vidioc_qbuf(struct et61x251_device* cam, void __user * arg)
{
struct v4l2_buffer b;
unsigned long lock_flags;
if (copy_from_user(&b, arg, sizeof(b)))
return -EFAULT;
if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
b.index >= cam->nbuffers || cam->io != IO_MMAP)
return -EINVAL;
if (cam->frame[b.index].state != F_UNUSED)
return -EINVAL;
cam->frame[b.index].state = F_QUEUED;
spin_lock_irqsave(&cam->queue_lock, lock_flags);
list_add_tail(&cam->frame[b.index].frame, &cam->inqueue);
spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
PDBGG("Frame #%lu queued", (unsigned long)b.index);
return 0;
}
static int
et61x251_vidioc_dqbuf(struct et61x251_device* cam, struct file* filp,
void __user * arg)
{
struct v4l2_buffer b;
struct et61x251_frame_t *f;
unsigned long lock_flags;
int err = 0;
if (copy_from_user(&b, arg, sizeof(b)))
return -EFAULT;
if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io!= IO_MMAP)
return -EINVAL;
if (list_empty(&cam->outqueue)) {
if (cam->stream == STREAM_OFF)
return -EINVAL;
if (filp->f_flags & O_NONBLOCK)
return -EAGAIN;
err = wait_event_interruptible
( cam->wait_frame,
(!list_empty(&cam->outqueue)) ||
(cam->state & DEV_DISCONNECTED) ||
(cam->state & DEV_MISCONFIGURED) );
if (err)
return err;
if (cam->state & DEV_DISCONNECTED)
return -ENODEV;
if (cam->state & DEV_MISCONFIGURED)
return -EIO;
}
spin_lock_irqsave(&cam->queue_lock, lock_flags);
f = list_entry(cam->outqueue.next, struct et61x251_frame_t, frame);
list_del(cam->outqueue.next);
spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
f->state = F_UNUSED;
memcpy(&b, &f->buf, sizeof(b));
if (f->vma_use_count)
b.flags |= V4L2_BUF_FLAG_MAPPED;
if (copy_to_user(arg, &b, sizeof(b)))
return -EFAULT;
PDBGG("Frame #%lu dequeued", (unsigned long)f->buf.index);
return 0;
}
static int
et61x251_vidioc_streamon(struct et61x251_device* cam, void __user * arg)
{
int type;
if (copy_from_user(&type, arg, sizeof(type)))
return -EFAULT;
if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io != IO_MMAP)
return -EINVAL;
if (list_empty(&cam->inqueue))
return -EINVAL;
cam->stream = STREAM_ON;
DBG(3, "Stream on");
return 0;
}
static int
et61x251_vidioc_streamoff(struct et61x251_device* cam, void __user * arg)
{
int type, err;
if (copy_from_user(&type, arg, sizeof(type)))
return -EFAULT;
if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io != IO_MMAP)
return -EINVAL;
if (cam->stream == STREAM_ON)
if ((err = et61x251_stream_interrupt(cam)))
return err;
et61x251_empty_framequeues(cam);
DBG(3, "Stream off");
return 0;
}
static int
et61x251_vidioc_g_parm(struct et61x251_device* cam, void __user * arg)
{
struct v4l2_streamparm sp;
if (copy_from_user(&sp, arg, sizeof(sp)))
return -EFAULT;
if (sp.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
sp.parm.capture.extendedmode = 0;
sp.parm.capture.readbuffers = cam->nreadbuffers;
if (copy_to_user(arg, &sp, sizeof(sp)))
return -EFAULT;
return 0;
}
static int
et61x251_vidioc_s_parm(struct et61x251_device* cam, void __user * arg)
{
struct v4l2_streamparm sp;
if (copy_from_user(&sp, arg, sizeof(sp)))
return -EFAULT;
if (sp.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
sp.parm.capture.extendedmode = 0;
if (sp.parm.capture.readbuffers == 0)
sp.parm.capture.readbuffers = cam->nreadbuffers;
if (sp.parm.capture.readbuffers > ET61X251_MAX_FRAMES)
sp.parm.capture.readbuffers = ET61X251_MAX_FRAMES;
if (copy_to_user(arg, &sp, sizeof(sp)))
return -EFAULT;
cam->nreadbuffers = sp.parm.capture.readbuffers;
return 0;
}
static int et61x251_ioctl_v4l2(struct inode* inode, struct file* filp,
unsigned int cmd, void __user * arg)
{
struct et61x251_device* cam = video_get_drvdata(video_devdata(filp));
switch (cmd) {
case VIDIOC_QUERYCAP:
return et61x251_vidioc_querycap(cam, arg);
case VIDIOC_ENUMINPUT:
return et61x251_vidioc_enuminput(cam, arg);
case VIDIOC_G_INPUT:
case VIDIOC_S_INPUT:
return et61x251_vidioc_gs_input(cam, arg);
case VIDIOC_QUERYCTRL:
return et61x251_vidioc_query_ctrl(cam, arg);
case VIDIOC_G_CTRL:
return et61x251_vidioc_g_ctrl(cam, arg);
case VIDIOC_S_CTRL_OLD:
case VIDIOC_S_CTRL:
return et61x251_vidioc_s_ctrl(cam, arg);
case VIDIOC_CROPCAP_OLD:
case VIDIOC_CROPCAP:
return et61x251_vidioc_cropcap(cam, arg);
case VIDIOC_G_CROP:
return et61x251_vidioc_g_crop(cam, arg);
case VIDIOC_S_CROP:
return et61x251_vidioc_s_crop(cam, arg);
case VIDIOC_ENUM_FMT:
return et61x251_vidioc_enum_fmt(cam, arg);
case VIDIOC_G_FMT:
return et61x251_vidioc_g_fmt(cam, arg);
case VIDIOC_TRY_FMT:
case VIDIOC_S_FMT:
return et61x251_vidioc_try_s_fmt(cam, cmd, arg);
case VIDIOC_G_JPEGCOMP:
return et61x251_vidioc_g_jpegcomp(cam, arg);
case VIDIOC_S_JPEGCOMP:
return et61x251_vidioc_s_jpegcomp(cam, arg);
case VIDIOC_REQBUFS:
return et61x251_vidioc_reqbufs(cam, arg);
case VIDIOC_QUERYBUF:
return et61x251_vidioc_querybuf(cam, arg);
case VIDIOC_QBUF:
return et61x251_vidioc_qbuf(cam, arg);
case VIDIOC_DQBUF:
return et61x251_vidioc_dqbuf(cam, filp, arg);
case VIDIOC_STREAMON:
return et61x251_vidioc_streamon(cam, arg);
case VIDIOC_STREAMOFF:
return et61x251_vidioc_streamoff(cam, arg);
case VIDIOC_G_PARM:
return et61x251_vidioc_g_parm(cam, arg);
case VIDIOC_S_PARM_OLD:
case VIDIOC_S_PARM:
return et61x251_vidioc_s_parm(cam, arg);
case VIDIOC_G_STD:
case VIDIOC_S_STD:
case VIDIOC_QUERYSTD:
case VIDIOC_ENUMSTD:
case VIDIOC_QUERYMENU:
return -EINVAL;
default:
return -EINVAL;
}
}
static int et61x251_ioctl(struct inode* inode, struct file* filp,
unsigned int cmd, unsigned long arg)
{
struct et61x251_device* cam = video_get_drvdata(video_devdata(filp));
int err = 0;
if (down_interruptible(&cam->fileop_sem))
return -ERESTARTSYS;
if (cam->state & DEV_DISCONNECTED) {
DBG(1, "Device not present");
up(&cam->fileop_sem);
return -ENODEV;
}
if (cam->state & DEV_MISCONFIGURED) {
DBG(1, "The camera is misconfigured. Close and open it "
"again.");
up(&cam->fileop_sem);
return -EIO;
}
V4LDBG(3, "et61x251", cmd);
err = et61x251_ioctl_v4l2(inode, filp, cmd, (void __user *)arg);
up(&cam->fileop_sem);
return err;
}
static struct file_operations et61x251_fops = {
.owner = THIS_MODULE,
.open = et61x251_open,
.release = et61x251_release,
.ioctl = et61x251_ioctl,
.read = et61x251_read,
.poll = et61x251_poll,
.mmap = et61x251_mmap,
.llseek = no_llseek,
};
/*****************************************************************************/
/* It exists a single interface only. We do not need to validate anything. */
static int
et61x251_usb_probe(struct usb_interface* intf, const struct usb_device_id* id)
{
struct usb_device *udev = interface_to_usbdev(intf);
struct et61x251_device* cam;
static unsigned int dev_nr = 0;
unsigned int i;
int err = 0;
if (!(cam = kzalloc(sizeof(struct et61x251_device), GFP_KERNEL)))
return -ENOMEM;
cam->usbdev = udev;
if (!(cam->control_buffer = kzalloc(8, GFP_KERNEL))) {
DBG(1, "kmalloc() failed");
err = -ENOMEM;
goto fail;
}
if (!(cam->v4ldev = video_device_alloc())) {
DBG(1, "video_device_alloc() failed");
err = -ENOMEM;
goto fail;
}
init_MUTEX(&cam->dev_sem);
DBG(2, "ET61X[12]51 PC Camera Controller detected "
"(vid/pid 0x%04X/0x%04X)",id->idVendor, id->idProduct);
for (i = 0; et61x251_sensor_table[i]; i++) {
err = et61x251_sensor_table[i](cam);
if (!err)
break;
}
if (!err && cam->sensor)
DBG(2, "%s image sensor detected", cam->sensor->name);
else {
DBG(1, "No supported image sensor detected");
err = -ENODEV;
goto fail;
}
if (et61x251_init(cam)) {
DBG(1, "Initialization failed. I will retry on open().");
cam->state |= DEV_MISCONFIGURED;
}
strcpy(cam->v4ldev->name, "ET61X[12]51 PC Camera");
cam->v4ldev->owner = THIS_MODULE;
cam->v4ldev->type = VID_TYPE_CAPTURE | VID_TYPE_SCALES;
cam->v4ldev->hardware = 0;
cam->v4ldev->fops = &et61x251_fops;
cam->v4ldev->minor = video_nr[dev_nr];
cam->v4ldev->release = video_device_release;
video_set_drvdata(cam->v4ldev, cam);
down(&cam->dev_sem);
err = video_register_device(cam->v4ldev, VFL_TYPE_GRABBER,
video_nr[dev_nr]);
if (err) {
DBG(1, "V4L2 device registration failed");
if (err == -ENFILE && video_nr[dev_nr] == -1)
DBG(1, "Free /dev/videoX node not found");
video_nr[dev_nr] = -1;
dev_nr = (dev_nr < ET61X251_MAX_DEVICES-1) ? dev_nr+1 : 0;
up(&cam->dev_sem);
goto fail;
}
DBG(2, "V4L2 device registered as /dev/video%d", cam->v4ldev->minor);
cam->module_param.force_munmap = force_munmap[dev_nr];
dev_nr = (dev_nr < ET61X251_MAX_DEVICES-1) ? dev_nr+1 : 0;
#ifdef CONFIG_VIDEO_ADV_DEBUG
et61x251_create_sysfs(cam);
DBG(2, "Optional device control through 'sysfs' interface ready");
#endif
usb_set_intfdata(intf, cam);
up(&cam->dev_sem);
return 0;
fail:
if (cam) {
kfree(cam->control_buffer);
if (cam->v4ldev)
video_device_release(cam->v4ldev);
kfree(cam);
}
return err;
}
static void et61x251_usb_disconnect(struct usb_interface* intf)
{
struct et61x251_device* cam = usb_get_intfdata(intf);
if (!cam)
return;
down_write(&et61x251_disconnect);
down(&cam->dev_sem);
DBG(2, "Disconnecting %s...", cam->v4ldev->name);
wake_up_interruptible_all(&cam->open);
if (cam->users) {
DBG(2, "Device /dev/video%d is open! Deregistration and "
"memory deallocation are deferred on close.",
cam->v4ldev->minor);
cam->state |= DEV_MISCONFIGURED;
et61x251_stop_transfer(cam);
cam->state |= DEV_DISCONNECTED;
wake_up_interruptible(&cam->wait_frame);
wake_up_interruptible(&cam->wait_stream);
} else {
cam->state |= DEV_DISCONNECTED;
et61x251_release_resources(cam);
}
up(&cam->dev_sem);
if (!cam->users)
kfree(cam);
up_write(&et61x251_disconnect);
}
static struct usb_driver et61x251_usb_driver = {
.name = "et61x251",
.id_table = et61x251_id_table,
.probe = et61x251_usb_probe,
.disconnect = et61x251_usb_disconnect,
};
/*****************************************************************************/
static int __init et61x251_module_init(void)
{
int err = 0;
KDBG(2, ET61X251_MODULE_NAME " v" ET61X251_MODULE_VERSION);
KDBG(3, ET61X251_MODULE_AUTHOR);
if ((err = usb_register(&et61x251_usb_driver)))
KDBG(1, "usb_register() failed");
return err;
}
static void __exit et61x251_module_exit(void)
{
usb_deregister(&et61x251_usb_driver);
}
module_init(et61x251_module_init);
module_exit(et61x251_module_exit);