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linux/drivers/media/video/w9968cf.c
Mauro Carvalho Chehab 7e0a16f611 V4L/DVB (10907): avoid loading the entire videodev.h header on V4L2 drivers 
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2009-03-30 12:43:15 -03:00

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/***************************************************************************
* Video4Linux driver for W996[87]CF JPEG USB Dual Mode Camera Chip. *
* *
* Copyright (C) 2002-2004 by Luca Risolia <luca.risolia@studio.unibo.it> *
* *
* - Memory management code from bttv driver by Ralph Metzler, *
* Marcus Metzler and Gerd Knorr. *
* - I2C interface to kernel, high-level image sensor control routines and *
* some symbolic names from OV511 driver by Mark W. McClelland. *
* - Low-level I2C fast write function by Piotr Czerczak. *
* - Low-level I2C read function by Frederic Jouault. *
* *
* 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/kernel.h>
#include <linux/kmod.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/vmalloc.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/ioctl.h>
#include <linux/delay.h>
#include <linux/stddef.h>
#include <asm/page.h>
#include <asm/uaccess.h>
#include <linux/page-flags.h>
#include <linux/videodev.h>
#include <media/v4l2-ioctl.h>
#include "w9968cf.h"
#include "w9968cf_decoder.h"
static struct w9968cf_vpp_t* w9968cf_vpp;
static DECLARE_WAIT_QUEUE_HEAD(w9968cf_vppmod_wait);
static LIST_HEAD(w9968cf_dev_list); /* head of V4L registered cameras list */
static DEFINE_MUTEX(w9968cf_devlist_mutex); /* semaphore for list traversal */
static DECLARE_RWSEM(w9968cf_disconnect); /* prevent races with open() */
/****************************************************************************
* Module macros and parameters *
****************************************************************************/
MODULE_DEVICE_TABLE(usb, winbond_id_table);
MODULE_AUTHOR(W9968CF_MODULE_AUTHOR" "W9968CF_AUTHOR_EMAIL);
MODULE_DESCRIPTION(W9968CF_MODULE_NAME);
MODULE_VERSION(W9968CF_MODULE_VERSION);
MODULE_LICENSE(W9968CF_MODULE_LICENSE);
MODULE_SUPPORTED_DEVICE("Video");
static unsigned short simcams = W9968CF_SIMCAMS;
static short video_nr[]={[0 ... W9968CF_MAX_DEVICES-1] = -1}; /*-1=first free*/
static unsigned int packet_size[] = {[0 ... W9968CF_MAX_DEVICES-1] =
W9968CF_PACKET_SIZE};
static unsigned short max_buffers[] = {[0 ... W9968CF_MAX_DEVICES-1] =
W9968CF_BUFFERS};
static int double_buffer[] = {[0 ... W9968CF_MAX_DEVICES-1] =
W9968CF_DOUBLE_BUFFER};
static int clamping[] = {[0 ... W9968CF_MAX_DEVICES-1] = W9968CF_CLAMPING};
static unsigned short filter_type[]= {[0 ... W9968CF_MAX_DEVICES-1] =
W9968CF_FILTER_TYPE};
static int largeview[]= {[0 ... W9968CF_MAX_DEVICES-1] = W9968CF_LARGEVIEW};
static unsigned short decompression[] = {[0 ... W9968CF_MAX_DEVICES-1] =
W9968CF_DECOMPRESSION};
static int upscaling[]= {[0 ... W9968CF_MAX_DEVICES-1] = W9968CF_UPSCALING};
static unsigned short force_palette[] = {[0 ... W9968CF_MAX_DEVICES-1] = 0};
static int force_rgb[] = {[0 ... W9968CF_MAX_DEVICES-1] = W9968CF_FORCE_RGB};
static int autobright[] = {[0 ... W9968CF_MAX_DEVICES-1] = W9968CF_AUTOBRIGHT};
static int autoexp[] = {[0 ... W9968CF_MAX_DEVICES-1] = W9968CF_AUTOEXP};
static unsigned short lightfreq[] = {[0 ... W9968CF_MAX_DEVICES-1] =
W9968CF_LIGHTFREQ};
static int bandingfilter[] = {[0 ... W9968CF_MAX_DEVICES-1]=
W9968CF_BANDINGFILTER};
static short clockdiv[] = {[0 ... W9968CF_MAX_DEVICES-1] = W9968CF_CLOCKDIV};
static int backlight[] = {[0 ... W9968CF_MAX_DEVICES-1] = W9968CF_BACKLIGHT};
static int mirror[] = {[0 ... W9968CF_MAX_DEVICES-1] = W9968CF_MIRROR};
static int monochrome[] = {[0 ... W9968CF_MAX_DEVICES-1]=W9968CF_MONOCHROME};
static unsigned int brightness[] = {[0 ... W9968CF_MAX_DEVICES-1] =
W9968CF_BRIGHTNESS};
static unsigned int hue[] = {[0 ... W9968CF_MAX_DEVICES-1] = W9968CF_HUE};
static unsigned int colour[]={[0 ... W9968CF_MAX_DEVICES-1] = W9968CF_COLOUR};
static unsigned int contrast[] = {[0 ... W9968CF_MAX_DEVICES-1] =
W9968CF_CONTRAST};
static unsigned int whiteness[] = {[0 ... W9968CF_MAX_DEVICES-1] =
W9968CF_WHITENESS};
#ifdef W9968CF_DEBUG
static unsigned short debug = W9968CF_DEBUG_LEVEL;
static int specific_debug = W9968CF_SPECIFIC_DEBUG;
#endif
static unsigned int param_nv[24]; /* number of values per parameter */
module_param(simcams, ushort, 0644);
module_param_array(video_nr, short, &param_nv[0], 0444);
module_param_array(packet_size, uint, &param_nv[1], 0444);
module_param_array(max_buffers, ushort, &param_nv[2], 0444);
module_param_array(double_buffer, bool, &param_nv[3], 0444);
module_param_array(clamping, bool, &param_nv[4], 0444);
module_param_array(filter_type, ushort, &param_nv[5], 0444);
module_param_array(largeview, bool, &param_nv[6], 0444);
module_param_array(decompression, ushort, &param_nv[7], 0444);
module_param_array(upscaling, bool, &param_nv[8], 0444);
module_param_array(force_palette, ushort, &param_nv[9], 0444);
module_param_array(force_rgb, ushort, &param_nv[10], 0444);
module_param_array(autobright, bool, &param_nv[11], 0444);
module_param_array(autoexp, bool, &param_nv[12], 0444);
module_param_array(lightfreq, ushort, &param_nv[13], 0444);
module_param_array(bandingfilter, bool, &param_nv[14], 0444);
module_param_array(clockdiv, short, &param_nv[15], 0444);
module_param_array(backlight, bool, &param_nv[16], 0444);
module_param_array(mirror, bool, &param_nv[17], 0444);
module_param_array(monochrome, bool, &param_nv[18], 0444);
module_param_array(brightness, uint, &param_nv[19], 0444);
module_param_array(hue, uint, &param_nv[20], 0444);
module_param_array(colour, uint, &param_nv[21], 0444);
module_param_array(contrast, uint, &param_nv[22], 0444);
module_param_array(whiteness, uint, &param_nv[23], 0444);
#ifdef W9968CF_DEBUG
module_param(debug, ushort, 0644);
module_param(specific_debug, bool, 0644);
#endif
MODULE_PARM_DESC(simcams,
"\n<n> Number of cameras allowed to stream simultaneously."
"\nn may vary from 0 to "
__MODULE_STRING(W9968CF_MAX_DEVICES)"."
"\nDefault value is "__MODULE_STRING(W9968CF_SIMCAMS)"."
"\n");
MODULE_PARM_DESC(video_nr,
"\n<-1|n[,...]> Specify V4L minor mode number."
"\n -1 = use next available (default)"
"\n n = use minor number n (integer >= 0)"
"\nYou can specify up to "__MODULE_STRING(W9968CF_MAX_DEVICES)
" cameras this way."
"\nFor example:"
"\nvideo_nr=-1,2,-1 would assign minor number 2 to"
"\nthe second camera and use auto for the first"
"\none and for every other camera."
"\n");
MODULE_PARM_DESC(packet_size,
"\n<n[,...]> Specify the maximum data payload"
"\nsize in bytes for alternate settings, for each device."
"\nn is scaled between 63 and 1023 "
"(default is "__MODULE_STRING(W9968CF_PACKET_SIZE)")."
"\n");
MODULE_PARM_DESC(max_buffers,
"\n<n[,...]> For advanced users."
"\nSpecify the maximum number of video frame buffers"
"\nto allocate for each device, from 2 to "
__MODULE_STRING(W9968CF_MAX_BUFFERS)
". (default is "__MODULE_STRING(W9968CF_BUFFERS)")."
"\n");
MODULE_PARM_DESC(double_buffer,
"\n<0|1[,...]> "
"Hardware double buffering: 0 disabled, 1 enabled."
"\nIt should be enabled if you want smooth video output: if"
"\nyou obtain out of sync. video, disable it, or try to"
"\ndecrease the 'clockdiv' module parameter value."
"\nDefault value is "__MODULE_STRING(W9968CF_DOUBLE_BUFFER)
" for every device."
"\n");
MODULE_PARM_DESC(clamping,
"\n<0|1[,...]> Video data clamping: 0 disabled, 1 enabled."
"\nDefault value is "__MODULE_STRING(W9968CF_CLAMPING)
" for every device."
"\n");
MODULE_PARM_DESC(filter_type,
"\n<0|1|2[,...]> Video filter type."
"\n0 none, 1 (1-2-1) 3-tap filter, "
"2 (2-3-6-3-2) 5-tap filter."
"\nDefault value is "__MODULE_STRING(W9968CF_FILTER_TYPE)
" for every device."
"\nThe filter is used to reduce noise and aliasing artifacts"
"\nproduced by the CCD or CMOS image sensor, and the scaling"
" process."
"\n");
MODULE_PARM_DESC(largeview,
"\n<0|1[,...]> Large view: 0 disabled, 1 enabled."
"\nDefault value is "__MODULE_STRING(W9968CF_LARGEVIEW)
" for every device."
"\n");
MODULE_PARM_DESC(upscaling,
"\n<0|1[,...]> Software scaling (for non-compressed video):"
"\n0 disabled, 1 enabled."
"\nDisable it if you have a slow CPU or you don't have"
" enough memory."
"\nDefault value is "__MODULE_STRING(W9968CF_UPSCALING)
" for every device."
"\nIf 'w9968cf-vpp' is not present, this parameter is"
" set to 0."
"\n");
MODULE_PARM_DESC(decompression,
"\n<0|1|2[,...]> Software video decompression:"
"\n- 0 disables decompression (doesn't allow formats needing"
" decompression)"
"\n- 1 forces decompression (allows formats needing"
" decompression only);"
"\n- 2 allows any permitted formats."
"\nFormats supporting compressed video are YUV422P and"
" YUV420P/YUV420 "
"\nin any resolutions where both width and height are "
"a multiple of 16."
"\nDefault value is "__MODULE_STRING(W9968CF_DECOMPRESSION)
" for every device."
"\nIf 'w9968cf-vpp' is not present, forcing decompression is "
"\nnot allowed; in this case this parameter is set to 2."
"\n");
MODULE_PARM_DESC(force_palette,
"\n<0"
"|" __MODULE_STRING(VIDEO_PALETTE_UYVY)
"|" __MODULE_STRING(VIDEO_PALETTE_YUV420)
"|" __MODULE_STRING(VIDEO_PALETTE_YUV422P)
"|" __MODULE_STRING(VIDEO_PALETTE_YUV420P)
"|" __MODULE_STRING(VIDEO_PALETTE_YUYV)
"|" __MODULE_STRING(VIDEO_PALETTE_YUV422)
"|" __MODULE_STRING(VIDEO_PALETTE_GREY)
"|" __MODULE_STRING(VIDEO_PALETTE_RGB555)
"|" __MODULE_STRING(VIDEO_PALETTE_RGB565)
"|" __MODULE_STRING(VIDEO_PALETTE_RGB24)
"|" __MODULE_STRING(VIDEO_PALETTE_RGB32)
"[,...]>"
" Force picture palette."
"\nIn order:"
"\n- 0 allows any of the following formats:"
"\n- UYVY 16 bpp - Original video, compression disabled"
"\n- YUV420 12 bpp - Original video, compression enabled"
"\n- YUV422P 16 bpp - Original video, compression enabled"
"\n- YUV420P 12 bpp - Original video, compression enabled"
"\n- YUVY 16 bpp - Software conversion from UYVY"
"\n- YUV422 16 bpp - Software conversion from UYVY"
"\n- GREY 8 bpp - Software conversion from UYVY"
"\n- RGB555 16 bpp - Software conversion from UYVY"
"\n- RGB565 16 bpp - Software conversion from UYVY"
"\n- RGB24 24 bpp - Software conversion from UYVY"
"\n- RGB32 32 bpp - Software conversion from UYVY"
"\nWhen not 0, this parameter will override 'decompression'."
"\nDefault value is 0 for every device."
"\nInitial palette is "
__MODULE_STRING(W9968CF_PALETTE_DECOMP_ON)"."
"\nIf 'w9968cf-vpp' is not present, this parameter is"
" set to 9 (UYVY)."
"\n");
MODULE_PARM_DESC(force_rgb,
"\n<0|1[,...]> Read RGB video data instead of BGR:"
"\n 1 = use RGB component ordering."
"\n 0 = use BGR component ordering."
"\nThis parameter has effect when using RGBX palettes only."
"\nDefault value is "__MODULE_STRING(W9968CF_FORCE_RGB)
" for every device."
"\n");
MODULE_PARM_DESC(autobright,
"\n<0|1[,...]> Image sensor automatically changes brightness:"
"\n 0 = no, 1 = yes"
"\nDefault value is "__MODULE_STRING(W9968CF_AUTOBRIGHT)
" for every device."
"\n");
MODULE_PARM_DESC(autoexp,
"\n<0|1[,...]> Image sensor automatically changes exposure:"
"\n 0 = no, 1 = yes"
"\nDefault value is "__MODULE_STRING(W9968CF_AUTOEXP)
" for every device."
"\n");
MODULE_PARM_DESC(lightfreq,
"\n<50|60[,...]> Light frequency in Hz:"
"\n 50 for European and Asian lighting,"
" 60 for American lighting."
"\nDefault value is "__MODULE_STRING(W9968CF_LIGHTFREQ)
" for every device."
"\n");
MODULE_PARM_DESC(bandingfilter,
"\n<0|1[,...]> Banding filter to reduce effects of"
" fluorescent lighting:"
"\n 0 disabled, 1 enabled."
"\nThis filter tries to reduce the pattern of horizontal"
"\nlight/dark bands caused by some (usually fluorescent)"
" lighting."
"\nDefault value is "__MODULE_STRING(W9968CF_BANDINGFILTER)
" for every device."
"\n");
MODULE_PARM_DESC(clockdiv,
"\n<-1|n[,...]> "
"Force pixel clock divisor to a specific value (for experts):"
"\n n may vary from 0 to 127."
"\n -1 for automatic value."
"\nSee also the 'double_buffer' module parameter."
"\nDefault value is "__MODULE_STRING(W9968CF_CLOCKDIV)
" for every device."
"\n");
MODULE_PARM_DESC(backlight,
"\n<0|1[,...]> Objects are lit from behind:"
"\n 0 = no, 1 = yes"
"\nDefault value is "__MODULE_STRING(W9968CF_BACKLIGHT)
" for every device."
"\n");
MODULE_PARM_DESC(mirror,
"\n<0|1[,...]> Reverse image horizontally:"
"\n 0 = no, 1 = yes"
"\nDefault value is "__MODULE_STRING(W9968CF_MIRROR)
" for every device."
"\n");
MODULE_PARM_DESC(monochrome,
"\n<0|1[,...]> Use image sensor as monochrome sensor:"
"\n 0 = no, 1 = yes"
"\nNot all the sensors support monochrome color."
"\nDefault value is "__MODULE_STRING(W9968CF_MONOCHROME)
" for every device."
"\n");
MODULE_PARM_DESC(brightness,
"\n<n[,...]> Set picture brightness (0-65535)."
"\nDefault value is "__MODULE_STRING(W9968CF_BRIGHTNESS)
" for every device."
"\nThis parameter has no effect if 'autobright' is enabled."
"\n");
MODULE_PARM_DESC(hue,
"\n<n[,...]> Set picture hue (0-65535)."
"\nDefault value is "__MODULE_STRING(W9968CF_HUE)
" for every device."
"\n");
MODULE_PARM_DESC(colour,
"\n<n[,...]> Set picture saturation (0-65535)."
"\nDefault value is "__MODULE_STRING(W9968CF_COLOUR)
" for every device."
"\n");
MODULE_PARM_DESC(contrast,
"\n<n[,...]> Set picture contrast (0-65535)."
"\nDefault value is "__MODULE_STRING(W9968CF_CONTRAST)
" for every device."
"\n");
MODULE_PARM_DESC(whiteness,
"\n<n[,...]> Set picture whiteness (0-65535)."
"\nDefault value is "__MODULE_STRING(W9968CF_WHITENESS)
" for every device."
"\n");
#ifdef W9968CF_DEBUG
MODULE_PARM_DESC(debug,
"\n<n> Debugging information level, from 0 to 6:"
"\n0 = none (use carefully)"
"\n1 = critical errors"
"\n2 = significant informations"
"\n3 = configuration or general messages"
"\n4 = warnings"
"\n5 = called functions"
"\n6 = function internals"
"\nLevel 5 and 6 are useful for testing only, when only "
"one device is used."
"\nDefault value is "__MODULE_STRING(W9968CF_DEBUG_LEVEL)"."
"\n");
MODULE_PARM_DESC(specific_debug,
"\n<0|1> Enable or disable specific debugging messages:"
"\n0 = print messages concerning every level"
" <= 'debug' level."
"\n1 = print messages concerning the level"
" indicated by 'debug'."
"\nDefault value is "
__MODULE_STRING(W9968CF_SPECIFIC_DEBUG)"."
"\n");
#endif /* W9968CF_DEBUG */
/****************************************************************************
* Some prototypes *
****************************************************************************/
/* Video4linux interface */
static const struct v4l2_file_operations w9968cf_fops;
static int w9968cf_open(struct file *);
static int w9968cf_release(struct file *);
static int w9968cf_mmap(struct file *, struct vm_area_struct *);
static long w9968cf_ioctl(struct file *, unsigned, unsigned long);
static ssize_t w9968cf_read(struct file *, char __user *, size_t, loff_t *);
static long w9968cf_v4l_ioctl(struct file *, unsigned int,
void __user *);
/* USB-specific */
static int w9968cf_start_transfer(struct w9968cf_device*);
static int w9968cf_stop_transfer(struct w9968cf_device*);
static int w9968cf_write_reg(struct w9968cf_device*, u16 value, u16 index);
static int w9968cf_read_reg(struct w9968cf_device*, u16 index);
static int w9968cf_write_fsb(struct w9968cf_device*, u16* data);
static int w9968cf_write_sb(struct w9968cf_device*, u16 value);
static int w9968cf_read_sb(struct w9968cf_device*);
static int w9968cf_upload_quantizationtables(struct w9968cf_device*);
static void w9968cf_urb_complete(struct urb *urb);
/* Low-level I2C (SMBus) I/O */
static int w9968cf_smbus_start(struct w9968cf_device*);
static int w9968cf_smbus_stop(struct w9968cf_device*);
static int w9968cf_smbus_write_byte(struct w9968cf_device*, u8 v);
static int w9968cf_smbus_read_byte(struct w9968cf_device*, u8* v);
static int w9968cf_smbus_write_ack(struct w9968cf_device*);
static int w9968cf_smbus_read_ack(struct w9968cf_device*);
static int w9968cf_smbus_refresh_bus(struct w9968cf_device*);
static int w9968cf_i2c_adap_read_byte(struct w9968cf_device* cam,
u16 address, u8* value);
static int w9968cf_i2c_adap_read_byte_data(struct w9968cf_device*, u16 address,
u8 subaddress, u8* value);
static int w9968cf_i2c_adap_write_byte(struct w9968cf_device*,
u16 address, u8 subaddress);
static int w9968cf_i2c_adap_fastwrite_byte_data(struct w9968cf_device*,
u16 address, u8 subaddress,
u8 value);
/* I2C interface to kernel */
static int w9968cf_i2c_init(struct w9968cf_device*);
static int w9968cf_i2c_smbus_xfer(struct i2c_adapter*, u16 addr,
unsigned short flags, char read_write,
u8 command, int size, union i2c_smbus_data*);
static u32 w9968cf_i2c_func(struct i2c_adapter*);
/* Memory management */
static void* rvmalloc(unsigned long size);
static void rvfree(void *mem, unsigned long size);
static void w9968cf_deallocate_memory(struct w9968cf_device*);
static int w9968cf_allocate_memory(struct w9968cf_device*);
/* High-level image sensor control functions */
static int w9968cf_sensor_set_control(struct w9968cf_device*,int cid,int val);
static int w9968cf_sensor_get_control(struct w9968cf_device*,int cid,int *val);
static int w9968cf_sensor_cmd(struct w9968cf_device*,
unsigned int cmd, void *arg);
static int w9968cf_sensor_init(struct w9968cf_device*);
static int w9968cf_sensor_update_settings(struct w9968cf_device*);
static int w9968cf_sensor_get_picture(struct w9968cf_device*);
static int w9968cf_sensor_update_picture(struct w9968cf_device*,
struct video_picture pict);
/* Other helper functions */
static void w9968cf_configure_camera(struct w9968cf_device*,struct usb_device*,
enum w9968cf_model_id,
const unsigned short dev_nr);
static void w9968cf_adjust_configuration(struct w9968cf_device*);
static int w9968cf_turn_on_led(struct w9968cf_device*);
static int w9968cf_init_chip(struct w9968cf_device*);
static inline u16 w9968cf_valid_palette(u16 palette);
static inline u16 w9968cf_valid_depth(u16 palette);
static inline u8 w9968cf_need_decompression(u16 palette);
static int w9968cf_set_picture(struct w9968cf_device*, struct video_picture);
static int w9968cf_set_window(struct w9968cf_device*, struct video_window);
static int w9968cf_postprocess_frame(struct w9968cf_device*,
struct w9968cf_frame_t*);
static int w9968cf_adjust_window_size(struct w9968cf_device*, u16* w, u16* h);
static void w9968cf_init_framelist(struct w9968cf_device*);
static void w9968cf_push_frame(struct w9968cf_device*, u8 f_num);
static void w9968cf_pop_frame(struct w9968cf_device*,struct w9968cf_frame_t**);
static void w9968cf_release_resources(struct w9968cf_device*);
/****************************************************************************
* Symbolic names *
****************************************************************************/
/* Used to represent a list of values and their respective symbolic names */
struct w9968cf_symbolic_list {
const int num;
const char *name;
};
/*--------------------------------------------------------------------------
Returns the name of the matching element in the symbolic_list array. The
end of the list must be marked with an element that has a NULL name.
--------------------------------------------------------------------------*/
static inline const char *
symbolic(struct w9968cf_symbolic_list list[], const int num)
{
int i;
for (i = 0; list[i].name != NULL; i++)
if (list[i].num == num)
return (list[i].name);
return "Unknown";
}
static struct w9968cf_symbolic_list camlist[] = {
{ W9968CF_MOD_GENERIC, "W996[87]CF JPEG USB Dual Mode Camera" },
{ W9968CF_MOD_CLVBWGP, "Creative Labs Video Blaster WebCam Go Plus" },
/* Other cameras (having the same descriptors as Generic W996[87]CF) */
{ W9968CF_MOD_ADPVDMA, "Aroma Digi Pen VGA Dual Mode ADG-5000" },
{ W9986CF_MOD_AAU, "AVerMedia AVerTV USB" },
{ W9968CF_MOD_CLVBWG, "Creative Labs Video Blaster WebCam Go" },
{ W9968CF_MOD_LL, "Lebon LDC-035A" },
{ W9968CF_MOD_EEEMC, "Ezonics EZ-802 EZMega Cam" },
{ W9968CF_MOD_OOE, "OmniVision OV8610-EDE" },
{ W9968CF_MOD_ODPVDMPC, "OPCOM Digi Pen VGA Dual Mode Pen Camera" },
{ W9968CF_MOD_PDPII, "Pretec Digi Pen-II" },
{ W9968CF_MOD_PDP480, "Pretec DigiPen-480" },
{ -1, NULL }
};
static struct w9968cf_symbolic_list senlist[] = {
{ CC_OV76BE, "OV76BE" },
{ CC_OV7610, "OV7610" },
{ CC_OV7620, "OV7620" },
{ CC_OV7620AE, "OV7620AE" },
{ CC_OV6620, "OV6620" },
{ CC_OV6630, "OV6630" },
{ CC_OV6630AE, "OV6630AE" },
{ CC_OV6630AF, "OV6630AF" },
{ -1, NULL }
};
/* Video4Linux1 palettes */
static struct w9968cf_symbolic_list v4l1_plist[] = {
{ VIDEO_PALETTE_GREY, "GREY" },
{ VIDEO_PALETTE_HI240, "HI240" },
{ VIDEO_PALETTE_RGB565, "RGB565" },
{ VIDEO_PALETTE_RGB24, "RGB24" },
{ VIDEO_PALETTE_RGB32, "RGB32" },
{ VIDEO_PALETTE_RGB555, "RGB555" },
{ VIDEO_PALETTE_YUV422, "YUV422" },
{ VIDEO_PALETTE_YUYV, "YUYV" },
{ VIDEO_PALETTE_UYVY, "UYVY" },
{ VIDEO_PALETTE_YUV420, "YUV420" },
{ VIDEO_PALETTE_YUV411, "YUV411" },
{ VIDEO_PALETTE_RAW, "RAW" },
{ VIDEO_PALETTE_YUV422P, "YUV422P" },
{ VIDEO_PALETTE_YUV411P, "YUV411P" },
{ VIDEO_PALETTE_YUV420P, "YUV420P" },
{ VIDEO_PALETTE_YUV410P, "YUV410P" },
{ -1, NULL }
};
/* Decoder error codes: */
static struct w9968cf_symbolic_list decoder_errlist[] = {
{ W9968CF_DEC_ERR_CORRUPTED_DATA, "Corrupted data" },
{ W9968CF_DEC_ERR_BUF_OVERFLOW, "Buffer overflow" },
{ W9968CF_DEC_ERR_NO_SOI, "SOI marker not found" },
{ W9968CF_DEC_ERR_NO_SOF0, "SOF0 marker not found" },
{ W9968CF_DEC_ERR_NO_SOS, "SOS marker not found" },
{ W9968CF_DEC_ERR_NO_EOI, "EOI marker not found" },
{ -1, NULL }
};
/* URB error codes: */
static struct w9968cf_symbolic_list urb_errlist[] = {
{ -ENOMEM, "No memory for allocation of internal structures" },
{ -ENOSPC, "The host controller's bandwidth is already consumed" },
{ -ENOENT, "URB was canceled by unlink_urb" },
{ -EXDEV, "ISO transfer only partially completed" },
{ -EAGAIN, "Too match scheduled for the future" },
{ -ENXIO, "URB already queued" },
{ -EFBIG, "Too much ISO frames requested" },
{ -ENOSR, "Buffer error (overrun)" },
{ -EPIPE, "Specified endpoint is stalled (device not responding)"},
{ -EOVERFLOW, "Babble (too much data)" },
{ -EPROTO, "Bit-stuff error (bad cable?)" },
{ -EILSEQ, "CRC/Timeout" },
{ -ETIME, "Device does not respond to token" },
{ -ETIMEDOUT, "Device does not respond to command" },
{ -1, NULL }
};
/****************************************************************************
* Memory management functions *
****************************************************************************/
static void* rvmalloc(unsigned long size)
{
void* mem;
unsigned long adr;
size = PAGE_ALIGN(size);
mem = vmalloc_32(size);
if (!mem)
return NULL;
memset(mem, 0, size); /* Clear the ram out, no junk to the user */
adr = (unsigned long) mem;
while (size > 0) {
SetPageReserved(vmalloc_to_page((void *)adr));
adr += PAGE_SIZE;
size -= PAGE_SIZE;
}
return mem;
}
static void rvfree(void* mem, unsigned long size)
{
unsigned long adr;
if (!mem)
return;
adr = (unsigned long) mem;
while ((long) size > 0) {
ClearPageReserved(vmalloc_to_page((void *)adr));
adr += PAGE_SIZE;
size -= PAGE_SIZE;
}
vfree(mem);
}
/*--------------------------------------------------------------------------
Deallocate previously allocated memory.
--------------------------------------------------------------------------*/
static void w9968cf_deallocate_memory(struct w9968cf_device* cam)
{
u8 i;
/* Free the isochronous transfer buffers */
for (i = 0; i < W9968CF_URBS; i++) {
kfree(cam->transfer_buffer[i]);
cam->transfer_buffer[i] = NULL;
}
/* Free temporary frame buffer */
if (cam->frame_tmp.buffer) {
rvfree(cam->frame_tmp.buffer, cam->frame_tmp.size);
cam->frame_tmp.buffer = NULL;
}
/* Free helper buffer */
if (cam->frame_vpp.buffer) {
rvfree(cam->frame_vpp.buffer, cam->frame_vpp.size);
cam->frame_vpp.buffer = NULL;
}
/* Free video frame buffers */
if (cam->frame[0].buffer) {
rvfree(cam->frame[0].buffer, cam->nbuffers*cam->frame[0].size);
cam->frame[0].buffer = NULL;
}
cam->nbuffers = 0;
DBG(5, "Memory successfully deallocated")
}
/*--------------------------------------------------------------------------
Allocate memory buffers for USB transfers and video frames.
This function is called by open() only.
Return 0 on success, a negative number otherwise.
--------------------------------------------------------------------------*/
static int w9968cf_allocate_memory(struct w9968cf_device* cam)
{
const u16 p_size = wMaxPacketSize[cam->altsetting-1];
void* buff = NULL;
unsigned long hw_bufsize, vpp_bufsize;
u8 i, bpp;
/* NOTE: Deallocation is done elsewhere in case of error */
/* Calculate the max amount of raw data per frame from the device */
hw_bufsize = cam->maxwidth*cam->maxheight*2;
/* Calculate the max buf. size needed for post-processing routines */
bpp = (w9968cf_vpp) ? 4 : 2;
if (cam->upscaling)
vpp_bufsize = max(W9968CF_MAX_WIDTH*W9968CF_MAX_HEIGHT*bpp,
cam->maxwidth*cam->maxheight*bpp);
else
vpp_bufsize = cam->maxwidth*cam->maxheight*bpp;
/* Allocate memory for the isochronous transfer buffers */
for (i = 0; i < W9968CF_URBS; i++) {
if (!(cam->transfer_buffer[i] =
kzalloc(W9968CF_ISO_PACKETS*p_size, GFP_KERNEL))) {
DBG(1, "Couldn't allocate memory for the isochronous "
"transfer buffers (%u bytes)",
p_size * W9968CF_ISO_PACKETS)
return -ENOMEM;
}
}
/* Allocate memory for the temporary frame buffer */
if (!(cam->frame_tmp.buffer = rvmalloc(hw_bufsize))) {
DBG(1, "Couldn't allocate memory for the temporary "
"video frame buffer (%lu bytes)", hw_bufsize)
return -ENOMEM;
}
cam->frame_tmp.size = hw_bufsize;
cam->frame_tmp.number = -1;
/* Allocate memory for the helper buffer */
if (w9968cf_vpp) {
if (!(cam->frame_vpp.buffer = rvmalloc(vpp_bufsize))) {
DBG(1, "Couldn't allocate memory for the helper buffer"
" (%lu bytes)", vpp_bufsize)
return -ENOMEM;
}
cam->frame_vpp.size = vpp_bufsize;
} else
cam->frame_vpp.buffer = NULL;
/* Allocate memory for video frame buffers */
cam->nbuffers = cam->max_buffers;
while (cam->nbuffers >= 2) {
if ((buff = rvmalloc(cam->nbuffers * vpp_bufsize)))
break;
else
cam->nbuffers--;
}
if (!buff) {
DBG(1, "Couldn't allocate memory for the video frame buffers")
cam->nbuffers = 0;
return -ENOMEM;
}
if (cam->nbuffers != cam->max_buffers)
DBG(2, "Couldn't allocate memory for %u video frame buffers. "
"Only memory for %u buffers has been allocated",
cam->max_buffers, cam->nbuffers)
for (i = 0; i < cam->nbuffers; i++) {
cam->frame[i].buffer = buff + i*vpp_bufsize;
cam->frame[i].size = vpp_bufsize;
cam->frame[i].number = i;
/* Circular list */
if (i != cam->nbuffers-1)
cam->frame[i].next = &cam->frame[i+1];
else
cam->frame[i].next = &cam->frame[0];
cam->frame[i].status = F_UNUSED;
}
DBG(5, "Memory successfully allocated")
return 0;
}
/****************************************************************************
* USB-specific functions *
****************************************************************************/
/*--------------------------------------------------------------------------
This is an handler function which is called after the URBs are completed.
It collects multiple data packets coming from the camera by putting them
into frame buffers: one or more zero data length data packets are used to
mark the end of a video frame; the first non-zero data packet is the start
of the next video frame; if an error is encountered in a packet, the entire
video frame is discarded and grabbed again.
If there are no requested frames in the FIFO list, packets are collected into
a temporary buffer.
--------------------------------------------------------------------------*/
static void w9968cf_urb_complete(struct urb *urb)
{
struct w9968cf_device* cam = (struct w9968cf_device*)urb->context;
struct w9968cf_frame_t** f;
unsigned int len, status;
void* pos;
u8 i;
int err = 0;
if ((!cam->streaming) || cam->disconnected) {
DBG(4, "Got interrupt, but not streaming")
return;
}
/* "(*f)" will be used instead of "cam->frame_current" */
f = &cam->frame_current;
/* If a frame has been requested and we are grabbing into
the temporary frame, we'll switch to that requested frame */
if ((*f) == &cam->frame_tmp && *cam->requested_frame) {
if (cam->frame_tmp.status == F_GRABBING) {
w9968cf_pop_frame(cam, &cam->frame_current);
(*f)->status = F_GRABBING;
(*f)->length = cam->frame_tmp.length;
memcpy((*f)->buffer, cam->frame_tmp.buffer,
(*f)->length);
DBG(6, "Switched from temp. frame to frame #%d",
(*f)->number)
}
}
for (i = 0; i < urb->number_of_packets; i++) {
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 && len != 0) {
DBG(4, "URB failed, error in data packet "
"(error #%u, %s)",
status, symbolic(urb_errlist, status))
(*f)->status = F_ERROR;
continue;
}
if (len) { /* start of frame */
if ((*f)->status == F_UNUSED) {
(*f)->status = F_GRABBING;
(*f)->length = 0;
}
/* Buffer overflows shouldn't happen, however...*/
if ((*f)->length + len > (*f)->size) {
DBG(4, "Buffer overflow: bad data packets")
(*f)->status = F_ERROR;
}
if ((*f)->status == F_GRABBING) {
memcpy((*f)->buffer + (*f)->length, pos, len);
(*f)->length += len;
}
} else if ((*f)->status == F_GRABBING) { /* end of frame */
DBG(6, "Frame #%d successfully grabbed", (*f)->number)
if (cam->vpp_flag & VPP_DECOMPRESSION) {
err = w9968cf_vpp->check_headers((*f)->buffer,
(*f)->length);
if (err) {
DBG(4, "Skip corrupted frame: %s",
symbolic(decoder_errlist, err))
(*f)->status = F_UNUSED;
continue; /* grab this frame again */
}
}
(*f)->status = F_READY;
(*f)->queued = 0;
/* Take a pointer to the new frame from the FIFO list.
If the list is empty,we'll use the temporary frame*/
if (*cam->requested_frame)
w9968cf_pop_frame(cam, &cam->frame_current);
else {
cam->frame_current = &cam->frame_tmp;
(*f)->status = F_UNUSED;
}
} else if ((*f)->status == F_ERROR)
(*f)->status = F_UNUSED; /* grab it again */
PDBGG("Frame length %lu | pack.#%u | pack.len. %u | state %d",
(unsigned long)(*f)->length, i, len, (*f)->status)
} /* end for */
/* Resubmit this URB */
urb->dev = cam->usbdev;
urb->status = 0;
spin_lock(&cam->urb_lock);
if (cam->streaming)
if ((err = usb_submit_urb(urb, GFP_ATOMIC))) {
cam->misconfigured = 1;
DBG(1, "Couldn't resubmit the URB: error %d, %s",
err, symbolic(urb_errlist, err))
}
spin_unlock(&cam->urb_lock);
/* Wake up the user process */
wake_up_interruptible(&cam->wait_queue);
}
/*---------------------------------------------------------------------------
Setup the URB structures for the isochronous transfer.
Submit the URBs so that the data transfer begins.
Return 0 on success, a negative number otherwise.
---------------------------------------------------------------------------*/
static int w9968cf_start_transfer(struct w9968cf_device* cam)
{
struct usb_device *udev = cam->usbdev;
struct urb* urb;
const u16 p_size = wMaxPacketSize[cam->altsetting-1];
u16 w, h, d;
int vidcapt;
u32 t_size;
int err = 0;
s8 i, j;
for (i = 0; i < W9968CF_URBS; i++) {
urb = usb_alloc_urb(W9968CF_ISO_PACKETS, GFP_KERNEL);
if (!urb) {
for (j = 0; j < i; j++)
usb_free_urb(cam->urb[j]);
DBG(1, "Couldn't allocate the URB structures")
return -ENOMEM;
}
cam->urb[i] = urb;
urb->dev = udev;
urb->context = (void*)cam;
urb->pipe = usb_rcvisocpipe(udev, 1);
urb->transfer_flags = URB_ISO_ASAP;
urb->number_of_packets = W9968CF_ISO_PACKETS;
urb->complete = w9968cf_urb_complete;
urb->transfer_buffer = cam->transfer_buffer[i];
urb->transfer_buffer_length = p_size*W9968CF_ISO_PACKETS;
urb->interval = 1;
for (j = 0; j < W9968CF_ISO_PACKETS; j++) {
urb->iso_frame_desc[j].offset = p_size*j;
urb->iso_frame_desc[j].length = p_size;
}
}
/* Transfer size per frame, in WORD ! */
d = cam->hw_depth;
w = cam->hw_width;
h = cam->hw_height;
t_size = (w*h*d)/16;
err = w9968cf_write_reg(cam, 0xbf17, 0x00); /* reset everything */
err += w9968cf_write_reg(cam, 0xbf10, 0x00); /* normal operation */
/* Transfer size */
err += w9968cf_write_reg(cam, t_size & 0xffff, 0x3d); /* low bits */
err += w9968cf_write_reg(cam, t_size >> 16, 0x3e); /* high bits */
if (cam->vpp_flag & VPP_DECOMPRESSION)
err += w9968cf_upload_quantizationtables(cam);
vidcapt = w9968cf_read_reg(cam, 0x16); /* read picture settings */
err += w9968cf_write_reg(cam, vidcapt|0x8000, 0x16); /* capt. enable */
err += usb_set_interface(udev, 0, cam->altsetting);
err += w9968cf_write_reg(cam, 0x8a05, 0x3c); /* USB FIFO enable */
if (err || (vidcapt < 0)) {
for (i = 0; i < W9968CF_URBS; i++)
usb_free_urb(cam->urb[i]);
DBG(1, "Couldn't tell the camera to start the data transfer")
return err;
}
w9968cf_init_framelist(cam);
/* Begin to grab into the temporary buffer */
cam->frame_tmp.status = F_UNUSED;
cam->frame_tmp.queued = 0;
cam->frame_current = &cam->frame_tmp;
if (!(cam->vpp_flag & VPP_DECOMPRESSION))
DBG(5, "Isochronous transfer size: %lu bytes/frame",
(unsigned long)t_size*2)
DBG(5, "Starting the isochronous transfer...")
cam->streaming = 1;
/* Submit the URBs */
for (i = 0; i < W9968CF_URBS; i++) {
err = usb_submit_urb(cam->urb[i], GFP_KERNEL);
if (err) {
cam->streaming = 0;
for (j = i-1; j >= 0; j--) {
usb_kill_urb(cam->urb[j]);
usb_free_urb(cam->urb[j]);
}
DBG(1, "Couldn't send a transfer request to the "
"USB core (error #%d, %s)", err,
symbolic(urb_errlist, err))
return err;
}
}
return 0;
}
/*--------------------------------------------------------------------------
Stop the isochronous transfer and set alternate setting to 0 (0Mb/s).
Return 0 on success, a negative number otherwise.
--------------------------------------------------------------------------*/
static int w9968cf_stop_transfer(struct w9968cf_device* cam)
{
struct usb_device *udev = cam->usbdev;
unsigned long lock_flags;
int err = 0;
s8 i;
if (!cam->streaming)
return 0;
/* This avoids race conditions with usb_submit_urb()
in the URB completition handler */
spin_lock_irqsave(&cam->urb_lock, lock_flags);
cam->streaming = 0;
spin_unlock_irqrestore(&cam->urb_lock, lock_flags);
for (i = W9968CF_URBS-1; i >= 0; i--)
if (cam->urb[i]) {
usb_kill_urb(cam->urb[i]);
usb_free_urb(cam->urb[i]);
cam->urb[i] = NULL;
}
if (cam->disconnected)
goto exit;
err = w9968cf_write_reg(cam, 0x0a05, 0x3c); /* stop USB transfer */
err += usb_set_interface(udev, 0, 0); /* 0 Mb/s */
err += w9968cf_write_reg(cam, 0x0000, 0x39); /* disable JPEG encoder */
err += w9968cf_write_reg(cam, 0x0000, 0x16); /* stop video capture */
if (err) {
DBG(2, "Failed to tell the camera to stop the isochronous "
"transfer. However this is not a critical error.")
return -EIO;
}
exit:
DBG(5, "Isochronous transfer stopped")
return 0;
}
/*--------------------------------------------------------------------------
Write a W9968CF register.
Return 0 on success, -1 otherwise.
--------------------------------------------------------------------------*/
static int w9968cf_write_reg(struct w9968cf_device* cam, u16 value, u16 index)
{
struct usb_device* udev = cam->usbdev;
int res;
res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0,
USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
value, index, NULL, 0, W9968CF_USB_CTRL_TIMEOUT);
if (res < 0)
DBG(4, "Failed to write a register "
"(value 0x%04X, index 0x%02X, error #%d, %s)",
value, index, res, symbolic(urb_errlist, res))
return (res >= 0) ? 0 : -1;
}
/*--------------------------------------------------------------------------
Read a W9968CF register.
Return the register value on success, -1 otherwise.
--------------------------------------------------------------------------*/
static int w9968cf_read_reg(struct w9968cf_device* cam, u16 index)
{
struct usb_device* udev = cam->usbdev;
u16* buff = cam->control_buffer;
int res;
res = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 1,
USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
0, index, buff, 2, W9968CF_USB_CTRL_TIMEOUT);
if (res < 0)
DBG(4, "Failed to read a register "
"(index 0x%02X, error #%d, %s)",
index, res, symbolic(urb_errlist, res))
return (res >= 0) ? (int)(*buff) : -1;
}
/*--------------------------------------------------------------------------
Write 64-bit data to the fast serial bus registers.
Return 0 on success, -1 otherwise.
--------------------------------------------------------------------------*/
static int w9968cf_write_fsb(struct w9968cf_device* cam, u16* data)
{
struct usb_device* udev = cam->usbdev;
u16 value;
int res;
value = *data++;
res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0,
USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
value, 0x06, data, 6, W9968CF_USB_CTRL_TIMEOUT);
if (res < 0)
DBG(4, "Failed to write the FSB registers "
"(error #%d, %s)", res, symbolic(urb_errlist, res))
return (res >= 0) ? 0 : -1;
}
/*--------------------------------------------------------------------------
Write data to the serial bus control register.
Return 0 on success, a negative number otherwise.
--------------------------------------------------------------------------*/
static int w9968cf_write_sb(struct w9968cf_device* cam, u16 value)
{
int err = 0;
err = w9968cf_write_reg(cam, value, 0x01);
udelay(W9968CF_I2C_BUS_DELAY);
return err;
}
/*--------------------------------------------------------------------------
Read data from the serial bus control register.
Return 0 on success, a negative number otherwise.
--------------------------------------------------------------------------*/
static int w9968cf_read_sb(struct w9968cf_device* cam)
{
int v = 0;
v = w9968cf_read_reg(cam, 0x01);
udelay(W9968CF_I2C_BUS_DELAY);
return v;
}
/*--------------------------------------------------------------------------
Upload quantization tables for the JPEG compression.
This function is called by w9968cf_start_transfer().
Return 0 on success, a negative number otherwise.
--------------------------------------------------------------------------*/
static int w9968cf_upload_quantizationtables(struct w9968cf_device* cam)
{
u16 a, b;
int err = 0, i, j;
err += w9968cf_write_reg(cam, 0x0010, 0x39); /* JPEG clock enable */
for (i = 0, j = 0; i < 32; i++, j += 2) {
a = Y_QUANTABLE[j] | ((unsigned)(Y_QUANTABLE[j+1]) << 8);
b = UV_QUANTABLE[j] | ((unsigned)(UV_QUANTABLE[j+1]) << 8);
err += w9968cf_write_reg(cam, a, 0x40+i);
err += w9968cf_write_reg(cam, b, 0x60+i);
}
err += w9968cf_write_reg(cam, 0x0012, 0x39); /* JPEG encoder enable */
return err;
}
/****************************************************************************
* Low-level I2C I/O functions. *
* The adapter supports the following I2C transfer functions: *
* i2c_adap_fastwrite_byte_data() (at 400 kHz bit frequency only) *
* i2c_adap_read_byte_data() *
* i2c_adap_read_byte() *
****************************************************************************/
static int w9968cf_smbus_start(struct w9968cf_device* cam)
{
int err = 0;
err += w9968cf_write_sb(cam, 0x0011); /* SDE=1, SDA=0, SCL=1 */
err += w9968cf_write_sb(cam, 0x0010); /* SDE=1, SDA=0, SCL=0 */
return err;
}
static int w9968cf_smbus_stop(struct w9968cf_device* cam)
{
int err = 0;
err += w9968cf_write_sb(cam, 0x0011); /* SDE=1, SDA=0, SCL=1 */
err += w9968cf_write_sb(cam, 0x0013); /* SDE=1, SDA=1, SCL=1 */
return err;
}
static int w9968cf_smbus_write_byte(struct w9968cf_device* cam, u8 v)
{
u8 bit;
int err = 0, sda;
for (bit = 0 ; bit < 8 ; bit++) {
sda = (v & 0x80) ? 2 : 0;
v <<= 1;
/* SDE=1, SDA=sda, SCL=0 */
err += w9968cf_write_sb(cam, 0x10 | sda);
/* SDE=1, SDA=sda, SCL=1 */
err += w9968cf_write_sb(cam, 0x11 | sda);
/* SDE=1, SDA=sda, SCL=0 */
err += w9968cf_write_sb(cam, 0x10 | sda);
}
return err;
}
static int w9968cf_smbus_read_byte(struct w9968cf_device* cam, u8* v)
{
u8 bit;
int err = 0;
*v = 0;
for (bit = 0 ; bit < 8 ; bit++) {
*v <<= 1;
err += w9968cf_write_sb(cam, 0x0013);
*v |= (w9968cf_read_sb(cam) & 0x0008) ? 1 : 0;
err += w9968cf_write_sb(cam, 0x0012);
}
return err;
}
static int w9968cf_smbus_write_ack(struct w9968cf_device* cam)
{
int err = 0;
err += w9968cf_write_sb(cam, 0x0010); /* SDE=1, SDA=0, SCL=0 */
err += w9968cf_write_sb(cam, 0x0011); /* SDE=1, SDA=0, SCL=1 */
err += w9968cf_write_sb(cam, 0x0010); /* SDE=1, SDA=0, SCL=0 */
return err;
}
static int w9968cf_smbus_read_ack(struct w9968cf_device* cam)
{
int err = 0, sda;
err += w9968cf_write_sb(cam, 0x0013); /* SDE=1, SDA=1, SCL=1 */
sda = (w9968cf_read_sb(cam) & 0x08) ? 1 : 0; /* sda = SDA */
err += w9968cf_write_sb(cam, 0x0012); /* SDE=1, SDA=1, SCL=0 */
if (sda < 0)
err += sda;
if (sda == 1) {
DBG(6, "Couldn't receive the ACK")
err += -1;
}
return err;
}
/* This seems to refresh the communication through the serial bus */
static int w9968cf_smbus_refresh_bus(struct w9968cf_device* cam)
{
int err = 0, j;
for (j = 1; j <= 10; j++) {
err = w9968cf_write_reg(cam, 0x0020, 0x01);
err += w9968cf_write_reg(cam, 0x0000, 0x01);
if (err)
break;
}
return err;
}
/* SMBus protocol: S Addr Wr [A] Subaddr [A] Value [A] P */
static int
w9968cf_i2c_adap_fastwrite_byte_data(struct w9968cf_device* cam,
u16 address, u8 subaddress,u8 value)
{
u16* data = cam->data_buffer;
int err = 0;
err += w9968cf_smbus_refresh_bus(cam);
/* Enable SBUS outputs */
err += w9968cf_write_sb(cam, 0x0020);
data[0] = 0x082f | ((address & 0x80) ? 0x1500 : 0x0);
data[0] |= (address & 0x40) ? 0x4000 : 0x0;
data[1] = 0x2082 | ((address & 0x40) ? 0x0005 : 0x0);
data[1] |= (address & 0x20) ? 0x0150 : 0x0;
data[1] |= (address & 0x10) ? 0x5400 : 0x0;
data[2] = 0x8208 | ((address & 0x08) ? 0x0015 : 0x0);
data[2] |= (address & 0x04) ? 0x0540 : 0x0;
data[2] |= (address & 0x02) ? 0x5000 : 0x0;
data[3] = 0x1d20 | ((address & 0x02) ? 0x0001 : 0x0);
data[3] |= (address & 0x01) ? 0x0054 : 0x0;
err += w9968cf_write_fsb(cam, data);
data[0] = 0x8208 | ((subaddress & 0x80) ? 0x0015 : 0x0);
data[0] |= (subaddress & 0x40) ? 0x0540 : 0x0;
data[0] |= (subaddress & 0x20) ? 0x5000 : 0x0;
data[1] = 0x0820 | ((subaddress & 0x20) ? 0x0001 : 0x0);
data[1] |= (subaddress & 0x10) ? 0x0054 : 0x0;
data[1] |= (subaddress & 0x08) ? 0x1500 : 0x0;
data[1] |= (subaddress & 0x04) ? 0x4000 : 0x0;
data[2] = 0x2082 | ((subaddress & 0x04) ? 0x0005 : 0x0);
data[2] |= (subaddress & 0x02) ? 0x0150 : 0x0;
data[2] |= (subaddress & 0x01) ? 0x5400 : 0x0;
data[3] = 0x001d;
err += w9968cf_write_fsb(cam, data);
data[0] = 0x8208 | ((value & 0x80) ? 0x0015 : 0x0);
data[0] |= (value & 0x40) ? 0x0540 : 0x0;
data[0] |= (value & 0x20) ? 0x5000 : 0x0;
data[1] = 0x0820 | ((value & 0x20) ? 0x0001 : 0x0);
data[1] |= (value & 0x10) ? 0x0054 : 0x0;
data[1] |= (value & 0x08) ? 0x1500 : 0x0;
data[1] |= (value & 0x04) ? 0x4000 : 0x0;
data[2] = 0x2082 | ((value & 0x04) ? 0x0005 : 0x0);
data[2] |= (value & 0x02) ? 0x0150 : 0x0;
data[2] |= (value & 0x01) ? 0x5400 : 0x0;
data[3] = 0xfe1d;
err += w9968cf_write_fsb(cam, data);
/* Disable SBUS outputs */
err += w9968cf_write_sb(cam, 0x0000);
if (!err)
DBG(5, "I2C write byte data done, addr.0x%04X, subaddr.0x%02X "
"value 0x%02X", address, subaddress, value)
else
DBG(5, "I2C write byte data failed, addr.0x%04X, "
"subaddr.0x%02X, value 0x%02X",
address, subaddress, value)
return err;
}
/* SMBus protocol: S Addr Wr [A] Subaddr [A] P S Addr+1 Rd [A] [Value] NA P */
static int
w9968cf_i2c_adap_read_byte_data(struct w9968cf_device* cam,
u16 address, u8 subaddress,
u8* value)
{
int err = 0;
/* Serial data enable */
err += w9968cf_write_sb(cam, 0x0013); /* don't change ! */
err += w9968cf_smbus_start(cam);
err += w9968cf_smbus_write_byte(cam, address);
err += w9968cf_smbus_read_ack(cam);
err += w9968cf_smbus_write_byte(cam, subaddress);
err += w9968cf_smbus_read_ack(cam);
err += w9968cf_smbus_stop(cam);
err += w9968cf_smbus_start(cam);
err += w9968cf_smbus_write_byte(cam, address + 1);
err += w9968cf_smbus_read_ack(cam);
err += w9968cf_smbus_read_byte(cam, value);
err += w9968cf_smbus_write_ack(cam);
err += w9968cf_smbus_stop(cam);
/* Serial data disable */
err += w9968cf_write_sb(cam, 0x0000);
if (!err)
DBG(5, "I2C read byte data done, addr.0x%04X, "
"subaddr.0x%02X, value 0x%02X",
address, subaddress, *value)
else
DBG(5, "I2C read byte data failed, addr.0x%04X, "
"subaddr.0x%02X, wrong value 0x%02X",
address, subaddress, *value)
return err;
}
/* SMBus protocol: S Addr+1 Rd [A] [Value] NA P */
static int
w9968cf_i2c_adap_read_byte(struct w9968cf_device* cam,
u16 address, u8* value)
{
int err = 0;
/* Serial data enable */
err += w9968cf_write_sb(cam, 0x0013);
err += w9968cf_smbus_start(cam);
err += w9968cf_smbus_write_byte(cam, address + 1);
err += w9968cf_smbus_read_ack(cam);
err += w9968cf_smbus_read_byte(cam, value);
err += w9968cf_smbus_write_ack(cam);
err += w9968cf_smbus_stop(cam);
/* Serial data disable */
err += w9968cf_write_sb(cam, 0x0000);
if (!err)
DBG(5, "I2C read byte done, addr.0x%04X, "
"value 0x%02X", address, *value)
else
DBG(5, "I2C read byte failed, addr.0x%04X, "
"wrong value 0x%02X", address, *value)
return err;
}
/* SMBus protocol: S Addr Wr [A] Value [A] P */
static int
w9968cf_i2c_adap_write_byte(struct w9968cf_device* cam,
u16 address, u8 value)
{
DBG(4, "i2c_write_byte() is an unsupported transfer mode")
return -EINVAL;
}
/****************************************************************************
* I2C interface to kernel *
****************************************************************************/
static int
w9968cf_i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr,
unsigned short flags, char read_write, u8 command,
int size, union i2c_smbus_data *data)
{
struct v4l2_device *v4l2_dev = i2c_get_adapdata(adapter);
struct w9968cf_device *cam = to_cam(v4l2_dev);
u8 i;
int err = 0;
if (size == I2C_SMBUS_BYTE) {
/* Why addr <<= 1? See OVXXX0_SID defines in ovcamchip.h */
addr <<= 1;
if (read_write == I2C_SMBUS_WRITE)
err = w9968cf_i2c_adap_write_byte(cam, addr, command);
else if (read_write == I2C_SMBUS_READ)
for (i = 1; i <= W9968CF_I2C_RW_RETRIES; i++) {
err = w9968cf_i2c_adap_read_byte(cam, addr,
&data->byte);
if (err) {
if (w9968cf_smbus_refresh_bus(cam)) {
err = -EIO;
break;
}
} else
break;
}
} else if (size == I2C_SMBUS_BYTE_DATA) {
addr <<= 1;
if (read_write == I2C_SMBUS_WRITE)
err = w9968cf_i2c_adap_fastwrite_byte_data(cam, addr,
command, data->byte);
else if (read_write == I2C_SMBUS_READ) {
for (i = 1; i <= W9968CF_I2C_RW_RETRIES; i++) {
err = w9968cf_i2c_adap_read_byte_data(cam,addr,
command, &data->byte);
if (err) {
if (w9968cf_smbus_refresh_bus(cam)) {
err = -EIO;
break;
}
} else
break;
}
} else
return -EINVAL;
} else {
DBG(4, "Unsupported I2C transfer mode (%d)", size)
return -EINVAL;
}
return err;
}
static u32 w9968cf_i2c_func(struct i2c_adapter* adap)
{
return I2C_FUNC_SMBUS_READ_BYTE |
I2C_FUNC_SMBUS_READ_BYTE_DATA |
I2C_FUNC_SMBUS_WRITE_BYTE_DATA;
}
static int w9968cf_i2c_init(struct w9968cf_device* cam)
{
int err = 0;
static struct i2c_algorithm algo = {
.smbus_xfer = w9968cf_i2c_smbus_xfer,
.functionality = w9968cf_i2c_func,
};
static struct i2c_adapter adap = {
.id = I2C_HW_SMBUS_W9968CF,
.owner = THIS_MODULE,
.algo = &algo,
};
memcpy(&cam->i2c_adapter, &adap, sizeof(struct i2c_adapter));
strcpy(cam->i2c_adapter.name, "w9968cf");
cam->i2c_adapter.dev.parent = &cam->usbdev->dev;
i2c_set_adapdata(&cam->i2c_adapter, &cam->v4l2_dev);
DBG(6, "Registering I2C adapter with kernel...")
err = i2c_add_adapter(&cam->i2c_adapter);
if (err)
DBG(1, "Failed to register the I2C adapter")
else
DBG(5, "I2C adapter registered")
return err;
}
/****************************************************************************
* Helper functions *
****************************************************************************/
/*--------------------------------------------------------------------------
Turn on the LED on some webcams. A beep should be heard too.
Return 0 on success, a negative number otherwise.
--------------------------------------------------------------------------*/
static int w9968cf_turn_on_led(struct w9968cf_device* cam)
{
int err = 0;
err += w9968cf_write_reg(cam, 0xff00, 0x00); /* power-down */
err += w9968cf_write_reg(cam, 0xbf17, 0x00); /* reset everything */
err += w9968cf_write_reg(cam, 0xbf10, 0x00); /* normal operation */
err += w9968cf_write_reg(cam, 0x0010, 0x01); /* serial bus, SDS high */
err += w9968cf_write_reg(cam, 0x0000, 0x01); /* serial bus, SDS low */
err += w9968cf_write_reg(cam, 0x0010, 0x01); /* ..high 'beep-beep' */
if (err)
DBG(2, "Couldn't turn on the LED")
DBG(5, "LED turned on")
return err;
}
/*--------------------------------------------------------------------------
Write some registers for the device initialization.
This function is called once on open().
Return 0 on success, a negative number otherwise.
--------------------------------------------------------------------------*/
static int w9968cf_init_chip(struct w9968cf_device* cam)
{
unsigned long hw_bufsize = cam->maxwidth*cam->maxheight*2,
y0 = 0x0000,
u0 = y0 + hw_bufsize/2,
v0 = u0 + hw_bufsize/4,
y1 = v0 + hw_bufsize/4,
u1 = y1 + hw_bufsize/2,
v1 = u1 + hw_bufsize/4;
int err = 0;
err += w9968cf_write_reg(cam, 0xff00, 0x00); /* power off */
err += w9968cf_write_reg(cam, 0xbf10, 0x00); /* power on */
err += w9968cf_write_reg(cam, 0x405d, 0x03); /* DRAM timings */
err += w9968cf_write_reg(cam, 0x0030, 0x04); /* SDRAM timings */
err += w9968cf_write_reg(cam, y0 & 0xffff, 0x20); /* Y buf.0, low */
err += w9968cf_write_reg(cam, y0 >> 16, 0x21); /* Y buf.0, high */
err += w9968cf_write_reg(cam, u0 & 0xffff, 0x24); /* U buf.0, low */
err += w9968cf_write_reg(cam, u0 >> 16, 0x25); /* U buf.0, high */
err += w9968cf_write_reg(cam, v0 & 0xffff, 0x28); /* V buf.0, low */
err += w9968cf_write_reg(cam, v0 >> 16, 0x29); /* V buf.0, high */
err += w9968cf_write_reg(cam, y1 & 0xffff, 0x22); /* Y buf.1, low */
err += w9968cf_write_reg(cam, y1 >> 16, 0x23); /* Y buf.1, high */
err += w9968cf_write_reg(cam, u1 & 0xffff, 0x26); /* U buf.1, low */
err += w9968cf_write_reg(cam, u1 >> 16, 0x27); /* U buf.1, high */
err += w9968cf_write_reg(cam, v1 & 0xffff, 0x2a); /* V buf.1, low */
err += w9968cf_write_reg(cam, v1 >> 16, 0x2b); /* V buf.1, high */
err += w9968cf_write_reg(cam, y1 & 0xffff, 0x32); /* JPEG buf 0 low */
err += w9968cf_write_reg(cam, y1 >> 16, 0x33); /* JPEG buf 0 high */
err += w9968cf_write_reg(cam, y1 & 0xffff, 0x34); /* JPEG buf 1 low */
err += w9968cf_write_reg(cam, y1 >> 16, 0x35); /* JPEG bug 1 high */
err += w9968cf_write_reg(cam, 0x0000, 0x36);/* JPEG restart interval */
err += w9968cf_write_reg(cam, 0x0804, 0x37);/*JPEG VLE FIFO threshold*/
err += w9968cf_write_reg(cam, 0x0000, 0x38);/* disable hw up-scaling */
err += w9968cf_write_reg(cam, 0x0000, 0x3f); /* JPEG/MCTL test data */
err += w9968cf_set_picture(cam, cam->picture); /* this before */
err += w9968cf_set_window(cam, cam->window);
if (err)
DBG(1, "Chip initialization failed")
else
DBG(5, "Chip successfully initialized")
return err;
}
/*--------------------------------------------------------------------------
Return non-zero if the palette is supported, 0 otherwise.
--------------------------------------------------------------------------*/
static inline u16 w9968cf_valid_palette(u16 palette)
{
u8 i = 0;
while (w9968cf_formatlist[i].palette != 0) {
if (palette == w9968cf_formatlist[i].palette)
return palette;
i++;
}
return 0;
}
/*--------------------------------------------------------------------------
Return the depth corresponding to the given palette.
Palette _must_ be supported !
--------------------------------------------------------------------------*/
static inline u16 w9968cf_valid_depth(u16 palette)
{
u8 i=0;
while (w9968cf_formatlist[i].palette != palette)
i++;
return w9968cf_formatlist[i].depth;
}
/*--------------------------------------------------------------------------
Return non-zero if the format requires decompression, 0 otherwise.
--------------------------------------------------------------------------*/
static inline u8 w9968cf_need_decompression(u16 palette)
{
u8 i = 0;
while (w9968cf_formatlist[i].palette != 0) {
if (palette == w9968cf_formatlist[i].palette)
return w9968cf_formatlist[i].compression;
i++;
}
return 0;
}
/*--------------------------------------------------------------------------
Change the picture settings of the camera.
Return 0 on success, a negative number otherwise.
--------------------------------------------------------------------------*/
static int
w9968cf_set_picture(struct w9968cf_device* cam, struct video_picture pict)
{
u16 fmt, hw_depth, hw_palette, reg_v = 0x0000;
int err = 0;
/* Make sure we are using a valid depth */
pict.depth = w9968cf_valid_depth(pict.palette);
fmt = pict.palette;
hw_depth = pict.depth; /* depth used by the winbond chip */
hw_palette = pict.palette; /* palette used by the winbond chip */
/* VS & HS polarities */
reg_v = (cam->vs_polarity << 12) | (cam->hs_polarity << 11);
switch (fmt)
{
case VIDEO_PALETTE_UYVY:
reg_v |= 0x0000;
cam->vpp_flag = VPP_NONE;
break;
case VIDEO_PALETTE_YUV422P:
reg_v |= 0x0002;
cam->vpp_flag = VPP_DECOMPRESSION;
break;
case VIDEO_PALETTE_YUV420:
case VIDEO_PALETTE_YUV420P:
reg_v |= 0x0003;
cam->vpp_flag = VPP_DECOMPRESSION;
break;
case VIDEO_PALETTE_YUYV:
case VIDEO_PALETTE_YUV422:
reg_v |= 0x0000;
cam->vpp_flag = VPP_SWAP_YUV_BYTES;
hw_palette = VIDEO_PALETTE_UYVY;
break;
/* Original video is used instead of RGBX palettes.
Software conversion later. */
case VIDEO_PALETTE_GREY:
case VIDEO_PALETTE_RGB555:
case VIDEO_PALETTE_RGB565:
case VIDEO_PALETTE_RGB24:
case VIDEO_PALETTE_RGB32:
reg_v |= 0x0000; /* UYVY 16 bit is used */
hw_depth = 16;
hw_palette = VIDEO_PALETTE_UYVY;
cam->vpp_flag = VPP_UYVY_TO_RGBX;
break;
}
/* NOTE: due to memory issues, it is better to disable the hardware
double buffering during compression */
if (cam->double_buffer && !(cam->vpp_flag & VPP_DECOMPRESSION))
reg_v |= 0x0080;
if (cam->clamping)
reg_v |= 0x0020;
if (cam->filter_type == 1)
reg_v |= 0x0008;
else if (cam->filter_type == 2)
reg_v |= 0x000c;
if ((err = w9968cf_write_reg(cam, reg_v, 0x16)))
goto error;
if ((err = w9968cf_sensor_update_picture(cam, pict)))
goto error;
/* If all went well, update the device data structure */
memcpy(&cam->picture, &pict, sizeof(pict));
cam->hw_depth = hw_depth;
cam->hw_palette = hw_palette;
/* Settings changed, so we clear the frame buffers */
memset(cam->frame[0].buffer, 0, cam->nbuffers*cam->frame[0].size);
DBG(4, "Palette is %s, depth is %u bpp",
symbolic(v4l1_plist, pict.palette), pict.depth)
return 0;
error:
DBG(1, "Failed to change picture settings")
return err;
}
/*--------------------------------------------------------------------------
Change the capture area size of the camera.
This function _must_ be called _after_ w9968cf_set_picture().
Return 0 on success, a negative number otherwise.
--------------------------------------------------------------------------*/
static int
w9968cf_set_window(struct w9968cf_device* cam, struct video_window win)
{
u16 x, y, w, h, scx, scy, cw, ch, ax, ay;
unsigned long fw, fh;
struct ovcamchip_window s_win;
int err = 0;
/* Work around to avoid FP arithmetics */
#define SC(x) ((x) << 10)
#define UNSC(x) ((x) >> 10)
/* Make sure we are using a supported resolution */
if ((err = w9968cf_adjust_window_size(cam, (u16*)&win.width,
(u16*)&win.height)))
goto error;
/* Scaling factors */
fw = SC(win.width) / cam->maxwidth;
fh = SC(win.height) / cam->maxheight;
/* Set up the width and height values used by the chip */
if ((win.width > cam->maxwidth) || (win.height > cam->maxheight)) {
cam->vpp_flag |= VPP_UPSCALE;
/* Calculate largest w,h mantaining the same w/h ratio */
w = (fw >= fh) ? cam->maxwidth : SC(win.width)/fh;
h = (fw >= fh) ? SC(win.height)/fw : cam->maxheight;
if (w < cam->minwidth) /* just in case */
w = cam->minwidth;
if (h < cam->minheight) /* just in case */
h = cam->minheight;
} else {
cam->vpp_flag &= ~VPP_UPSCALE;
w = win.width;
h = win.height;
}
/* x,y offsets of the cropped area */
scx = cam->start_cropx;
scy = cam->start_cropy;
/* Calculate cropped area manteining the right w/h ratio */
if (cam->largeview && !(cam->vpp_flag & VPP_UPSCALE)) {
cw = (fw >= fh) ? cam->maxwidth : SC(win.width)/fh;
ch = (fw >= fh) ? SC(win.height)/fw : cam->maxheight;
} else {
cw = w;
ch = h;
}
/* Setup the window of the sensor */
s_win.format = VIDEO_PALETTE_UYVY;
s_win.width = cam->maxwidth;
s_win.height = cam->maxheight;
s_win.quarter = 0; /* full progressive video */
/* Center it */
s_win.x = (s_win.width - cw) / 2;
s_win.y = (s_win.height - ch) / 2;
/* Clock divisor */
if (cam->clockdiv >= 0)
s_win.clockdiv = cam->clockdiv; /* manual override */
else
switch (cam->sensor) {
case CC_OV6620:
s_win.clockdiv = 0;
break;
case CC_OV6630:
s_win.clockdiv = 0;
break;
case CC_OV76BE:
case CC_OV7610:
case CC_OV7620:
s_win.clockdiv = 0;
break;
default:
s_win.clockdiv = W9968CF_DEF_CLOCKDIVISOR;
}
/* We have to scale win.x and win.y offsets */
if ( (cam->largeview && !(cam->vpp_flag & VPP_UPSCALE))
|| (cam->vpp_flag & VPP_UPSCALE) ) {
ax = SC(win.x)/fw;
ay = SC(win.y)/fh;
} else {
ax = win.x;
ay = win.y;
}
if ((ax + cw) > cam->maxwidth)
ax = cam->maxwidth - cw;
if ((ay + ch) > cam->maxheight)
ay = cam->maxheight - ch;
/* Adjust win.x, win.y */
if ( (cam->largeview && !(cam->vpp_flag & VPP_UPSCALE))
|| (cam->vpp_flag & VPP_UPSCALE) ) {
win.x = UNSC(ax*fw);
win.y = UNSC(ay*fh);
} else {
win.x = ax;
win.y = ay;
}
/* Offsets used by the chip */
x = ax + s_win.x;
y = ay + s_win.y;
/* Go ! */
if ((err = w9968cf_sensor_cmd(cam, OVCAMCHIP_CMD_S_MODE, &s_win)))
goto error;
err += w9968cf_write_reg(cam, scx + x, 0x10);
err += w9968cf_write_reg(cam, scy + y, 0x11);
err += w9968cf_write_reg(cam, scx + x + cw, 0x12);
err += w9968cf_write_reg(cam, scy + y + ch, 0x13);
err += w9968cf_write_reg(cam, w, 0x14);
err += w9968cf_write_reg(cam, h, 0x15);
/* JPEG width & height */
err += w9968cf_write_reg(cam, w, 0x30);
err += w9968cf_write_reg(cam, h, 0x31);
/* Y & UV frame buffer strides (in WORD) */
if (cam->vpp_flag & VPP_DECOMPRESSION) {
err += w9968cf_write_reg(cam, w/2, 0x2c);
err += w9968cf_write_reg(cam, w/4, 0x2d);
} else
err += w9968cf_write_reg(cam, w, 0x2c);
if (err)
goto error;
/* If all went well, update the device data structure */
memcpy(&cam->window, &win, sizeof(win));
cam->hw_width = w;
cam->hw_height = h;
/* Settings changed, so we clear the frame buffers */
memset(cam->frame[0].buffer, 0, cam->nbuffers*cam->frame[0].size);
DBG(4, "The capture area is %dx%d, Offset (x,y)=(%u,%u)",
win.width, win.height, win.x, win.y)
PDBGG("x=%u ,y=%u, w=%u, h=%u, ax=%u, ay=%u, s_win.x=%u, s_win.y=%u, "
"cw=%u, ch=%u, win.x=%u, win.y=%u, win.width=%u, win.height=%u",
x, y, w, h, ax, ay, s_win.x, s_win.y, cw, ch, win.x, win.y,
win.width, win.height)
return 0;
error:
DBG(1, "Failed to change the capture area size")
return err;
}
/*--------------------------------------------------------------------------
Adjust the asked values for window width and height.
Return 0 on success, -1 otherwise.
--------------------------------------------------------------------------*/
static int
w9968cf_adjust_window_size(struct w9968cf_device* cam, u16* width, u16* height)
{
u16 maxw, maxh;
if ((*width < cam->minwidth) || (*height < cam->minheight))
return -ERANGE;
maxw = cam->upscaling && !(cam->vpp_flag & VPP_DECOMPRESSION) &&
w9968cf_vpp ? max((u16)W9968CF_MAX_WIDTH, cam->maxwidth)
: cam->maxwidth;
maxh = cam->upscaling && !(cam->vpp_flag & VPP_DECOMPRESSION) &&
w9968cf_vpp ? max((u16)W9968CF_MAX_HEIGHT, cam->maxheight)
: cam->maxheight;
if (*width > maxw)
*width = maxw;
if (*height > maxh)
*height = maxh;
if (cam->vpp_flag & VPP_DECOMPRESSION) {
*width &= ~15L; /* multiple of 16 */
*height &= ~15L;
}
PDBGG("Window size adjusted w=%u, h=%u ", *width, *height)
return 0;
}
/*--------------------------------------------------------------------------
Initialize the FIFO list of requested frames.
--------------------------------------------------------------------------*/
static void w9968cf_init_framelist(struct w9968cf_device* cam)
{
u8 i;
for (i = 0; i < cam->nbuffers; i++) {
cam->requested_frame[i] = NULL;
cam->frame[i].queued = 0;
cam->frame[i].status = F_UNUSED;
}
}
/*--------------------------------------------------------------------------
Add a frame in the FIFO list of requested frames.
This function is called in process context.
--------------------------------------------------------------------------*/
static void w9968cf_push_frame(struct w9968cf_device* cam, u8 f_num)
{
u8 f;
unsigned long lock_flags;
spin_lock_irqsave(&cam->flist_lock, lock_flags);
for (f=0; cam->requested_frame[f] != NULL; f++);
cam->requested_frame[f] = &cam->frame[f_num];
cam->frame[f_num].queued = 1;
cam->frame[f_num].status = F_UNUSED; /* clear the status */
spin_unlock_irqrestore(&cam->flist_lock, lock_flags);
DBG(6, "Frame #%u pushed into the FIFO list. Position %u", f_num, f)
}
/*--------------------------------------------------------------------------
Read, store and remove the first pointer in the FIFO list of requested
frames. This function is called in interrupt context.
--------------------------------------------------------------------------*/
static void
w9968cf_pop_frame(struct w9968cf_device* cam, struct w9968cf_frame_t** framep)
{
u8 i;
spin_lock(&cam->flist_lock);
*framep = cam->requested_frame[0];
/* Shift the list of pointers */
for (i = 0; i < cam->nbuffers-1; i++)
cam->requested_frame[i] = cam->requested_frame[i+1];
cam->requested_frame[i] = NULL;
spin_unlock(&cam->flist_lock);
DBG(6,"Popped frame #%d from the list", (*framep)->number)
}
/*--------------------------------------------------------------------------
High-level video post-processing routine on grabbed frames.
Return 0 on success, a negative number otherwise.
--------------------------------------------------------------------------*/
static int
w9968cf_postprocess_frame(struct w9968cf_device* cam,
struct w9968cf_frame_t* fr)
{
void *pIn = fr->buffer, *pOut = cam->frame_vpp.buffer, *tmp;
u16 w = cam->window.width,
h = cam->window.height,
d = cam->picture.depth,
fmt = cam->picture.palette,
rgb = cam->force_rgb,
hw_w = cam->hw_width,
hw_h = cam->hw_height,
hw_d = cam->hw_depth;
int err = 0;
#define _PSWAP(pIn, pOut) {tmp = (pIn); (pIn) = (pOut); (pOut) = tmp;}
if (cam->vpp_flag & VPP_DECOMPRESSION) {
memcpy(pOut, pIn, fr->length);
_PSWAP(pIn, pOut)
err = w9968cf_vpp->decode(pIn, fr->length, hw_w, hw_h, pOut);
PDBGG("Compressed frame length: %lu",(unsigned long)fr->length)
fr->length = (hw_w*hw_h*hw_d)/8;
_PSWAP(pIn, pOut)
if (err) {
DBG(4, "An error occurred while decoding the frame: "
"%s", symbolic(decoder_errlist, err))
return err;
} else
DBG(6, "Frame decoded")
}
if (cam->vpp_flag & VPP_SWAP_YUV_BYTES) {
w9968cf_vpp->swap_yuvbytes(pIn, fr->length);
DBG(6, "Original UYVY component ordering changed")
}
if (cam->vpp_flag & VPP_UPSCALE) {
w9968cf_vpp->scale_up(pIn, pOut, hw_w, hw_h, hw_d, w, h);
fr->length = (w*h*hw_d)/8;
_PSWAP(pIn, pOut)
DBG(6, "Vertical up-scaling done: %u,%u,%ubpp->%u,%u",
hw_w, hw_h, hw_d, w, h)
}
if (cam->vpp_flag & VPP_UYVY_TO_RGBX) {
w9968cf_vpp->uyvy_to_rgbx(pIn, fr->length, pOut, fmt, rgb);
fr->length = (w*h*d)/8;
_PSWAP(pIn, pOut)
DBG(6, "UYVY-16bit to %s conversion done",
symbolic(v4l1_plist, fmt))
}
if (pOut == fr->buffer)
memcpy(fr->buffer, cam->frame_vpp.buffer, fr->length);
return 0;
}
/****************************************************************************
* Image sensor control routines *
****************************************************************************/
static int
w9968cf_sensor_set_control(struct w9968cf_device* cam, int cid, int val)
{
struct ovcamchip_control ctl;
int err;
ctl.id = cid;
ctl.value = val;
err = w9968cf_sensor_cmd(cam, OVCAMCHIP_CMD_S_CTRL, &ctl);
return err;
}
static int
w9968cf_sensor_get_control(struct w9968cf_device* cam, int cid, int* val)
{
struct ovcamchip_control ctl;
int err;
ctl.id = cid;
err = w9968cf_sensor_cmd(cam, OVCAMCHIP_CMD_G_CTRL, &ctl);
if (!err)
*val = ctl.value;
return err;
}
static int
w9968cf_sensor_cmd(struct w9968cf_device* cam, unsigned int cmd, void* arg)
{
int rc;
rc = v4l2_subdev_call(cam->sensor_sd, core, ioctl, cmd, arg);
/* The I2C driver returns -EPERM on non-supported controls */
return (rc < 0 && rc != -EPERM) ? rc : 0;
}
/*--------------------------------------------------------------------------
Update some settings of the image sensor.
Returns: 0 on success, a negative number otherwise.
--------------------------------------------------------------------------*/
static int w9968cf_sensor_update_settings(struct w9968cf_device* cam)
{
int err = 0;
/* Auto brightness */
err = w9968cf_sensor_set_control(cam, OVCAMCHIP_CID_AUTOBRIGHT,
cam->auto_brt);
if (err)
return err;
/* Auto exposure */
err = w9968cf_sensor_set_control(cam, OVCAMCHIP_CID_AUTOEXP,
cam->auto_exp);
if (err)
return err;
/* Banding filter */
err = w9968cf_sensor_set_control(cam, OVCAMCHIP_CID_BANDFILT,
cam->bandfilt);
if (err)
return err;
/* Light frequency */
err = w9968cf_sensor_set_control(cam, OVCAMCHIP_CID_FREQ,
cam->lightfreq);
if (err)
return err;
/* Back light */
err = w9968cf_sensor_set_control(cam, OVCAMCHIP_CID_BACKLIGHT,
cam->backlight);
if (err)
return err;
/* Mirror */
err = w9968cf_sensor_set_control(cam, OVCAMCHIP_CID_MIRROR,
cam->mirror);
if (err)
return err;
return 0;
}
/*--------------------------------------------------------------------------
Get some current picture settings from the image sensor and update the
internal 'picture' structure of the camera.
Returns: 0 on success, a negative number otherwise.
--------------------------------------------------------------------------*/
static int w9968cf_sensor_get_picture(struct w9968cf_device* cam)
{
int err, v;
err = w9968cf_sensor_get_control(cam, OVCAMCHIP_CID_CONT, &v);
if (err)
return err;
cam->picture.contrast = v;
err = w9968cf_sensor_get_control(cam, OVCAMCHIP_CID_BRIGHT, &v);
if (err)
return err;
cam->picture.brightness = v;
err = w9968cf_sensor_get_control(cam, OVCAMCHIP_CID_SAT, &v);
if (err)
return err;
cam->picture.colour = v;
err = w9968cf_sensor_get_control(cam, OVCAMCHIP_CID_HUE, &v);
if (err)
return err;
cam->picture.hue = v;
DBG(5, "Got picture settings from the image sensor")
PDBGG("Brightness, contrast, hue, colour, whiteness are "
"%u,%u,%u,%u,%u", cam->picture.brightness,cam->picture.contrast,
cam->picture.hue, cam->picture.colour, cam->picture.whiteness)
return 0;
}
/*--------------------------------------------------------------------------
Update picture settings of the image sensor.
Returns: 0 on success, a negative number otherwise.
--------------------------------------------------------------------------*/
static int
w9968cf_sensor_update_picture(struct w9968cf_device* cam,
struct video_picture pict)
{
int err = 0;
if ((!cam->sensor_initialized)
|| pict.contrast != cam->picture.contrast) {
err = w9968cf_sensor_set_control(cam, OVCAMCHIP_CID_CONT,
pict.contrast);
if (err)
goto fail;
DBG(4, "Contrast changed from %u to %u",
cam->picture.contrast, pict.contrast)
cam->picture.contrast = pict.contrast;
}
if (((!cam->sensor_initialized) ||
pict.brightness != cam->picture.brightness) && (!cam->auto_brt)) {
err = w9968cf_sensor_set_control(cam, OVCAMCHIP_CID_BRIGHT,
pict.brightness);
if (err)
goto fail;
DBG(4, "Brightness changed from %u to %u",
cam->picture.brightness, pict.brightness)
cam->picture.brightness = pict.brightness;
}
if ((!cam->sensor_initialized) || pict.colour != cam->picture.colour) {
err = w9968cf_sensor_set_control(cam, OVCAMCHIP_CID_SAT,
pict.colour);
if (err)
goto fail;
DBG(4, "Colour changed from %u to %u",
cam->picture.colour, pict.colour)
cam->picture.colour = pict.colour;
}
if ((!cam->sensor_initialized) || pict.hue != cam->picture.hue) {
err = w9968cf_sensor_set_control(cam, OVCAMCHIP_CID_HUE,
pict.hue);
if (err)
goto fail;
DBG(4, "Hue changed from %u to %u",
cam->picture.hue, pict.hue)
cam->picture.hue = pict.hue;
}
return 0;
fail:
DBG(4, "Failed to change sensor picture setting")
return err;
}
/****************************************************************************
* Camera configuration *
****************************************************************************/
/*--------------------------------------------------------------------------
This function is called when a supported image sensor is detected.
Return 0 if the initialization succeeds, a negative number otherwise.
--------------------------------------------------------------------------*/
static int w9968cf_sensor_init(struct w9968cf_device* cam)
{
int err = 0;
if ((err = w9968cf_sensor_cmd(cam, OVCAMCHIP_CMD_INITIALIZE,
&cam->monochrome)))
goto error;
if ((err = w9968cf_sensor_cmd(cam, OVCAMCHIP_CMD_Q_SUBTYPE,
&cam->sensor)))
goto error;
/* NOTE: Make sure width and height are a multiple of 16 */
switch (v4l2_i2c_subdev_addr(cam->sensor_sd)) {
case OV6xx0_SID:
cam->maxwidth = 352;
cam->maxheight = 288;
cam->minwidth = 64;
cam->minheight = 48;
break;
case OV7xx0_SID:
cam->maxwidth = 640;
cam->maxheight = 480;
cam->minwidth = 64;
cam->minheight = 48;
break;
default:
DBG(1, "Not supported image sensor detected for %s",
symbolic(camlist, cam->id))
return -EINVAL;
}
/* These values depend on the ones in the ovxxx0.c sources */
switch (cam->sensor) {
case CC_OV7620:
cam->start_cropx = 287;
cam->start_cropy = 35;
/* Seems to work around a bug in the image sensor */
cam->vs_polarity = 1;
cam->hs_polarity = 1;
break;
default:
cam->start_cropx = 320;
cam->start_cropy = 35;
cam->vs_polarity = 1;
cam->hs_polarity = 0;
}
if ((err = w9968cf_sensor_update_settings(cam)))
goto error;
if ((err = w9968cf_sensor_update_picture(cam, cam->picture)))
goto error;
cam->sensor_initialized = 1;
DBG(2, "%s image sensor initialized", symbolic(senlist, cam->sensor))
return 0;
error:
cam->sensor_initialized = 0;
cam->sensor = CC_UNKNOWN;
DBG(1, "Image sensor initialization failed for %s (/dev/video%d). "
"Try to detach and attach this device again",
symbolic(camlist, cam->id), cam->v4ldev->num)
return err;
}
/*--------------------------------------------------------------------------
Fill some basic fields in the main device data structure.
This function is called once on w9968cf_usb_probe() for each recognized
camera.
--------------------------------------------------------------------------*/
static void
w9968cf_configure_camera(struct w9968cf_device* cam,
struct usb_device* udev,
enum w9968cf_model_id mod_id,
const unsigned short dev_nr)
{
mutex_init(&cam->fileop_mutex);
init_waitqueue_head(&cam->open);
spin_lock_init(&cam->urb_lock);
spin_lock_init(&cam->flist_lock);
cam->users = 0;
cam->disconnected = 0;
cam->id = mod_id;
cam->sensor = CC_UNKNOWN;
cam->sensor_initialized = 0;
/* Calculate the alternate setting number (from 1 to 16)
according to the 'packet_size' module parameter */
if (packet_size[dev_nr] < W9968CF_MIN_PACKET_SIZE)
packet_size[dev_nr] = W9968CF_MIN_PACKET_SIZE;
for (cam->altsetting = 1;
packet_size[dev_nr] < wMaxPacketSize[cam->altsetting-1];
cam->altsetting++);
cam->max_buffers = (max_buffers[dev_nr] < 2 ||
max_buffers[dev_nr] > W9968CF_MAX_BUFFERS)
? W9968CF_BUFFERS : (u8)max_buffers[dev_nr];
cam->double_buffer = (double_buffer[dev_nr] == 0 ||
double_buffer[dev_nr] == 1)
? (u8)double_buffer[dev_nr]:W9968CF_DOUBLE_BUFFER;
cam->clamping = (clamping[dev_nr] == 0 || clamping[dev_nr] == 1)
? (u8)clamping[dev_nr] : W9968CF_CLAMPING;
cam->filter_type = (filter_type[dev_nr] == 0 ||
filter_type[dev_nr] == 1 ||
filter_type[dev_nr] == 2)
? (u8)filter_type[dev_nr] : W9968CF_FILTER_TYPE;
cam->capture = 1;
cam->largeview = (largeview[dev_nr] == 0 || largeview[dev_nr] == 1)
? (u8)largeview[dev_nr] : W9968CF_LARGEVIEW;
cam->decompression = (decompression[dev_nr] == 0 ||
decompression[dev_nr] == 1 ||
decompression[dev_nr] == 2)
? (u8)decompression[dev_nr]:W9968CF_DECOMPRESSION;
cam->upscaling = (upscaling[dev_nr] == 0 ||
upscaling[dev_nr] == 1)
? (u8)upscaling[dev_nr] : W9968CF_UPSCALING;
cam->auto_brt = (autobright[dev_nr] == 0 || autobright[dev_nr] == 1)
? (u8)autobright[dev_nr] : W9968CF_AUTOBRIGHT;
cam->auto_exp = (autoexp[dev_nr] == 0 || autoexp[dev_nr] == 1)
? (u8)autoexp[dev_nr] : W9968CF_AUTOEXP;
cam->lightfreq = (lightfreq[dev_nr] == 50 || lightfreq[dev_nr] == 60)
? (u8)lightfreq[dev_nr] : W9968CF_LIGHTFREQ;
cam->bandfilt = (bandingfilter[dev_nr] == 0 ||
bandingfilter[dev_nr] == 1)
? (u8)bandingfilter[dev_nr] : W9968CF_BANDINGFILTER;
cam->backlight = (backlight[dev_nr] == 0 || backlight[dev_nr] == 1)
? (u8)backlight[dev_nr] : W9968CF_BACKLIGHT;
cam->clockdiv = (clockdiv[dev_nr] == -1 || clockdiv[dev_nr] >= 0)
? (s8)clockdiv[dev_nr] : W9968CF_CLOCKDIV;
cam->mirror = (mirror[dev_nr] == 0 || mirror[dev_nr] == 1)
? (u8)mirror[dev_nr] : W9968CF_MIRROR;
cam->monochrome = (monochrome[dev_nr] == 0 || monochrome[dev_nr] == 1)
? monochrome[dev_nr] : W9968CF_MONOCHROME;
cam->picture.brightness = (u16)brightness[dev_nr];
cam->picture.hue = (u16)hue[dev_nr];
cam->picture.colour = (u16)colour[dev_nr];
cam->picture.contrast = (u16)contrast[dev_nr];
cam->picture.whiteness = (u16)whiteness[dev_nr];
if (w9968cf_valid_palette((u16)force_palette[dev_nr])) {
cam->picture.palette = (u16)force_palette[dev_nr];
cam->force_palette = 1;
} else {
cam->force_palette = 0;
if (cam->decompression == 0)
cam->picture.palette = W9968CF_PALETTE_DECOMP_OFF;
else if (cam->decompression == 1)
cam->picture.palette = W9968CF_PALETTE_DECOMP_FORCE;
else
cam->picture.palette = W9968CF_PALETTE_DECOMP_ON;
}
cam->picture.depth = w9968cf_valid_depth(cam->picture.palette);
cam->force_rgb = (force_rgb[dev_nr] == 0 || force_rgb[dev_nr] == 1)
? (u8)force_rgb[dev_nr] : W9968CF_FORCE_RGB;
cam->window.x = 0;
cam->window.y = 0;
cam->window.width = W9968CF_WIDTH;
cam->window.height = W9968CF_HEIGHT;
cam->window.chromakey = 0;
cam->window.clipcount = 0;
cam->window.flags = 0;
DBG(3, "%s configured with settings #%u:",
symbolic(camlist, cam->id), dev_nr)
DBG(3, "- Data packet size for USB isochrnous transfer: %u bytes",
wMaxPacketSize[cam->altsetting-1])
DBG(3, "- Number of requested video frame buffers: %u",
cam->max_buffers)
if (cam->double_buffer)
DBG(3, "- Hardware double buffering enabled")
else
DBG(3, "- Hardware double buffering disabled")
if (cam->filter_type == 0)
DBG(3, "- Video filtering disabled")
else if (cam->filter_type == 1)
DBG(3, "- Video filtering enabled: type 1-2-1")
else if (cam->filter_type == 2)
DBG(3, "- Video filtering enabled: type 2-3-6-3-2")
if (cam->clamping)
DBG(3, "- Video data clamping (CCIR-601 format) enabled")
else
DBG(3, "- Video data clamping (CCIR-601 format) disabled")
if (cam->largeview)
DBG(3, "- Large view enabled")
else
DBG(3, "- Large view disabled")
if ((cam->decompression) == 0 && (!cam->force_palette))
DBG(3, "- Decompression disabled")
else if ((cam->decompression) == 1 && (!cam->force_palette))
DBG(3, "- Decompression forced")
else if ((cam->decompression) == 2 && (!cam->force_palette))
DBG(3, "- Decompression allowed")
if (cam->upscaling)
DBG(3, "- Software image scaling enabled")
else
DBG(3, "- Software image scaling disabled")
if (cam->force_palette)
DBG(3, "- Image palette forced to %s",
symbolic(v4l1_plist, cam->picture.palette))
if (cam->force_rgb)
DBG(3, "- RGB component ordering will be used instead of BGR")
if (cam->auto_brt)
DBG(3, "- Auto brightness enabled")
else
DBG(3, "- Auto brightness disabled")
if (cam->auto_exp)
DBG(3, "- Auto exposure enabled")
else
DBG(3, "- Auto exposure disabled")
if (cam->backlight)
DBG(3, "- Backlight exposure algorithm enabled")
else
DBG(3, "- Backlight exposure algorithm disabled")
if (cam->mirror)
DBG(3, "- Mirror enabled")
else
DBG(3, "- Mirror disabled")
if (cam->bandfilt)
DBG(3, "- Banding filter enabled")
else
DBG(3, "- Banding filter disabled")
DBG(3, "- Power lighting frequency: %u", cam->lightfreq)
if (cam->clockdiv == -1)
DBG(3, "- Automatic clock divisor enabled")
else
DBG(3, "- Clock divisor: %d", cam->clockdiv)
if (cam->monochrome)
DBG(3, "- Image sensor used as monochrome")
else
DBG(3, "- Image sensor not used as monochrome")
}
/*--------------------------------------------------------------------------
If the video post-processing module is not loaded, some parameters
must be overridden.
--------------------------------------------------------------------------*/
static void w9968cf_adjust_configuration(struct w9968cf_device* cam)
{
if (!w9968cf_vpp) {
if (cam->decompression == 1) {
cam->decompression = 2;
DBG(2, "Video post-processing module not found: "
"'decompression' parameter forced to 2")
}
if (cam->upscaling) {
cam->upscaling = 0;
DBG(2, "Video post-processing module not found: "
"'upscaling' parameter forced to 0")
}
if (cam->picture.palette != VIDEO_PALETTE_UYVY) {
cam->force_palette = 0;
DBG(2, "Video post-processing module not found: "
"'force_palette' parameter forced to 0")
}
cam->picture.palette = VIDEO_PALETTE_UYVY;
cam->picture.depth = w9968cf_valid_depth(cam->picture.palette);
}
}
/*--------------------------------------------------------------------------
Release the resources used by the driver.
This function is called on disconnect
(or on close if deallocation has been deferred)
--------------------------------------------------------------------------*/
static void w9968cf_release_resources(struct w9968cf_device* cam)
{
mutex_lock(&w9968cf_devlist_mutex);
DBG(2, "V4L device deregistered: /dev/video%d", cam->v4ldev->num)
video_unregister_device(cam->v4ldev);
list_del(&cam->v4llist);
i2c_del_adapter(&cam->i2c_adapter);
w9968cf_deallocate_memory(cam);
kfree(cam->control_buffer);
kfree(cam->data_buffer);
v4l2_device_unregister(&cam->v4l2_dev);
mutex_unlock(&w9968cf_devlist_mutex);
}
/****************************************************************************
* Video4Linux interface *
****************************************************************************/
static int w9968cf_open(struct file *filp)
{
struct w9968cf_device* cam;
int err;
/* This the only safe way to prevent race conditions with disconnect */
if (!down_read_trylock(&w9968cf_disconnect))
return -EAGAIN;
cam = (struct w9968cf_device*)video_get_drvdata(video_devdata(filp));
mutex_lock(&cam->dev_mutex);
if (cam->sensor == CC_UNKNOWN) {
DBG(2, "No supported image sensor has been detected by the "
"'ovcamchip' module for the %s (/dev/video%d). Make "
"sure it is loaded *before* (re)connecting the camera.",
symbolic(camlist, cam->id), cam->v4ldev->num)
mutex_unlock(&cam->dev_mutex);
up_read(&w9968cf_disconnect);
return -ENODEV;
}
if (cam->users) {
DBG(2, "%s (/dev/video%d) has been already occupied by '%s'",
symbolic(camlist, cam->id), cam->v4ldev->num, cam->command)
if ((filp->f_flags & O_NONBLOCK)||(filp->f_flags & O_NDELAY)) {
mutex_unlock(&cam->dev_mutex);
up_read(&w9968cf_disconnect);
return -EWOULDBLOCK;
}
mutex_unlock(&cam->dev_mutex);
err = wait_event_interruptible_exclusive(cam->open,
cam->disconnected ||
!cam->users);
if (err) {
up_read(&w9968cf_disconnect);
return err;
}
if (cam->disconnected) {
up_read(&w9968cf_disconnect);
return -ENODEV;
}
mutex_lock(&cam->dev_mutex);
}
DBG(5, "Opening '%s', /dev/video%d ...",
symbolic(camlist, cam->id), cam->v4ldev->num)
cam->streaming = 0;
cam->misconfigured = 0;
w9968cf_adjust_configuration(cam);
if ((err = w9968cf_allocate_memory(cam)))
goto deallocate_memory;
if ((err = w9968cf_init_chip(cam)))
goto deallocate_memory;
if ((err = w9968cf_start_transfer(cam)))
goto deallocate_memory;
filp->private_data = cam;
cam->users++;
strcpy(cam->command, current->comm);
init_waitqueue_head(&cam->wait_queue);
DBG(5, "Video device is open")
mutex_unlock(&cam->dev_mutex);
up_read(&w9968cf_disconnect);
return 0;
deallocate_memory:
w9968cf_deallocate_memory(cam);
DBG(2, "Failed to open the video device")
mutex_unlock(&cam->dev_mutex);
up_read(&w9968cf_disconnect);
return err;
}
static int w9968cf_release(struct file *filp)
{
struct w9968cf_device* cam;
cam = (struct w9968cf_device*)video_get_drvdata(video_devdata(filp));
mutex_lock(&cam->dev_mutex); /* prevent disconnect() to be called */
w9968cf_stop_transfer(cam);
if (cam->disconnected) {
w9968cf_release_resources(cam);
mutex_unlock(&cam->dev_mutex);
kfree(cam);
return 0;
}
cam->users--;
w9968cf_deallocate_memory(cam);
wake_up_interruptible_nr(&cam->open, 1);
DBG(5, "Video device closed")
mutex_unlock(&cam->dev_mutex);
return 0;
}
static ssize_t
w9968cf_read(struct file* filp, char __user * buf, size_t count, loff_t* f_pos)
{
struct w9968cf_device* cam;
struct w9968cf_frame_t* fr;
int err = 0;
cam = (struct w9968cf_device*)video_get_drvdata(video_devdata(filp));
if (filp->f_flags & O_NONBLOCK)
return -EWOULDBLOCK;
if (mutex_lock_interruptible(&cam->fileop_mutex))
return -ERESTARTSYS;
if (cam->disconnected) {
DBG(2, "Device not present")
mutex_unlock(&cam->fileop_mutex);
return -ENODEV;
}
if (cam->misconfigured) {
DBG(2, "The camera is misconfigured. Close and open it again.")
mutex_unlock(&cam->fileop_mutex);
return -EIO;
}
if (!cam->frame[0].queued)
w9968cf_push_frame(cam, 0);
if (!cam->frame[1].queued)
w9968cf_push_frame(cam, 1);
err = wait_event_interruptible(cam->wait_queue,
cam->frame[0].status == F_READY ||
cam->frame[1].status == F_READY ||
cam->disconnected);
if (err) {
mutex_unlock(&cam->fileop_mutex);
return err;
}
if (cam->disconnected) {
mutex_unlock(&cam->fileop_mutex);
return -ENODEV;
}
fr = (cam->frame[0].status == F_READY) ? &cam->frame[0]:&cam->frame[1];
if (w9968cf_vpp)
w9968cf_postprocess_frame(cam, fr);
if (count > fr->length)
count = fr->length;
if (copy_to_user(buf, fr->buffer, count)) {
fr->status = F_UNUSED;
mutex_unlock(&cam->fileop_mutex);
return -EFAULT;
}
*f_pos += count;
fr->status = F_UNUSED;
DBG(5, "%zu bytes read", count)
mutex_unlock(&cam->fileop_mutex);
return count;
}
static int w9968cf_mmap(struct file* filp, struct vm_area_struct *vma)
{
struct w9968cf_device* cam = (struct w9968cf_device*)
video_get_drvdata(video_devdata(filp));
unsigned long vsize = vma->vm_end - vma->vm_start,
psize = cam->nbuffers * cam->frame[0].size,
start = vma->vm_start,
pos = (unsigned long)cam->frame[0].buffer,
page;
if (cam->disconnected) {
DBG(2, "Device not present")
return -ENODEV;
}
if (cam->misconfigured) {
DBG(2, "The camera is misconfigured. Close and open it again")
return -EIO;
}
PDBGG("mmapping %lu bytes...", vsize)
if (vsize > psize - (vma->vm_pgoff << PAGE_SHIFT))
return -EINVAL;
while (vsize > 0) {
page = vmalloc_to_pfn((void *)pos);
if (remap_pfn_range(vma, start, page + vma->vm_pgoff,
PAGE_SIZE, vma->vm_page_prot))
return -EAGAIN;
start += PAGE_SIZE;
pos += PAGE_SIZE;
vsize -= PAGE_SIZE;
}
DBG(5, "mmap method successfully called")
return 0;
}
static long
w9968cf_ioctl(struct file *filp,
unsigned int cmd, unsigned long arg)
{
struct w9968cf_device* cam;
long err;
cam = (struct w9968cf_device*)video_get_drvdata(video_devdata(filp));
if (mutex_lock_interruptible(&cam->fileop_mutex))
return -ERESTARTSYS;
if (cam->disconnected) {
DBG(2, "Device not present")
mutex_unlock(&cam->fileop_mutex);
return -ENODEV;
}
if (cam->misconfigured) {
DBG(2, "The camera is misconfigured. Close and open it again.")
mutex_unlock(&cam->fileop_mutex);
return -EIO;
}
err = w9968cf_v4l_ioctl(filp, cmd, (void __user *)arg);
mutex_unlock(&cam->fileop_mutex);
return err;
}
static long w9968cf_v4l_ioctl(struct file *filp,
unsigned int cmd, void __user *arg)
{
struct w9968cf_device* cam;
const char* v4l1_ioctls[] = {
"?", "CGAP", "GCHAN", "SCHAN", "GTUNER", "STUNER",
"GPICT", "SPICT", "CCAPTURE", "GWIN", "SWIN", "GFBUF",
"SFBUF", "KEY", "GFREQ", "SFREQ", "GAUDIO", "SAUDIO",
"SYNC", "MCAPTURE", "GMBUF", "GUNIT", "GCAPTURE", "SCAPTURE",
"SPLAYMODE", "SWRITEMODE", "GPLAYINFO", "SMICROCODE",
"GVBIFMT", "SVBIFMT"
};
#define V4L1_IOCTL(cmd) \
((_IOC_NR((cmd)) < ARRAY_SIZE(v4l1_ioctls)) ? \
v4l1_ioctls[_IOC_NR((cmd))] : "?")
cam = (struct w9968cf_device*)video_get_drvdata(video_devdata(filp));
switch (cmd) {
case VIDIOCGCAP: /* get video capability */
{
struct video_capability cap = {
.type = VID_TYPE_CAPTURE | VID_TYPE_SCALES,
.channels = 1,
.audios = 0,
.minwidth = cam->minwidth,
.minheight = cam->minheight,
};
sprintf(cap.name, "W996[87]CF USB Camera #%d",
cam->v4ldev->num);
cap.maxwidth = (cam->upscaling && w9968cf_vpp)
? max((u16)W9968CF_MAX_WIDTH, cam->maxwidth)
: cam->maxwidth;
cap.maxheight = (cam->upscaling && w9968cf_vpp)
? max((u16)W9968CF_MAX_HEIGHT, cam->maxheight)
: cam->maxheight;
if (copy_to_user(arg, &cap, sizeof(cap)))
return -EFAULT;
DBG(5, "VIDIOCGCAP successfully called")
return 0;
}
case VIDIOCGCHAN: /* get video channel informations */
{
struct video_channel chan;
if (copy_from_user(&chan, arg, sizeof(chan)))
return -EFAULT;
if (chan.channel != 0)
return -EINVAL;
strcpy(chan.name, "Camera");
chan.tuners = 0;
chan.flags = 0;
chan.type = VIDEO_TYPE_CAMERA;
chan.norm = VIDEO_MODE_AUTO;
if (copy_to_user(arg, &chan, sizeof(chan)))
return -EFAULT;
DBG(5, "VIDIOCGCHAN successfully called")
return 0;
}
case VIDIOCSCHAN: /* set active channel */
{
struct video_channel chan;
if (copy_from_user(&chan, arg, sizeof(chan)))
return -EFAULT;
if (chan.channel != 0)
return -EINVAL;
DBG(5, "VIDIOCSCHAN successfully called")
return 0;
}
case VIDIOCGPICT: /* get image properties of the picture */
{
if (w9968cf_sensor_get_picture(cam))
return -EIO;
if (copy_to_user(arg, &cam->picture, sizeof(cam->picture)))
return -EFAULT;
DBG(5, "VIDIOCGPICT successfully called")
return 0;
}
case VIDIOCSPICT: /* change picture settings */
{
struct video_picture pict;
int err = 0;
if (copy_from_user(&pict, arg, sizeof(pict)))
return -EFAULT;
if ( (cam->force_palette || !w9968cf_vpp)
&& pict.palette != cam->picture.palette ) {
DBG(4, "Palette %s rejected: only %s is allowed",
symbolic(v4l1_plist, pict.palette),
symbolic(v4l1_plist, cam->picture.palette))
return -EINVAL;
}
if (!w9968cf_valid_palette(pict.palette)) {
DBG(4, "Palette %s not supported. VIDIOCSPICT failed",
symbolic(v4l1_plist, pict.palette))
return -EINVAL;
}
if (!cam->force_palette) {
if (cam->decompression == 0) {
if (w9968cf_need_decompression(pict.palette)) {
DBG(4, "Decompression disabled: palette %s is not "
"allowed. VIDIOCSPICT failed",
symbolic(v4l1_plist, pict.palette))
return -EINVAL;
}
} else if (cam->decompression == 1) {
if (!w9968cf_need_decompression(pict.palette)) {
DBG(4, "Decompression forced: palette %s is not "
"allowed. VIDIOCSPICT failed",
symbolic(v4l1_plist, pict.palette))
return -EINVAL;
}
}
}
if (pict.depth != w9968cf_valid_depth(pict.palette)) {
DBG(4, "Requested depth %u bpp is not valid for %s "
"palette: ignored and changed to %u bpp",
pict.depth, symbolic(v4l1_plist, pict.palette),
w9968cf_valid_depth(pict.palette))
pict.depth = w9968cf_valid_depth(pict.palette);
}
if (pict.palette != cam->picture.palette) {
if(*cam->requested_frame
|| cam->frame_current->queued) {
err = wait_event_interruptible
( cam->wait_queue,
cam->disconnected ||
(!*cam->requested_frame &&
!cam->frame_current->queued) );
if (err)
return err;
if (cam->disconnected)
return -ENODEV;
}
if (w9968cf_stop_transfer(cam))
goto ioctl_fail;
if (w9968cf_set_picture(cam, pict))
goto ioctl_fail;
if (w9968cf_start_transfer(cam))
goto ioctl_fail;
} else if (w9968cf_sensor_update_picture(cam, pict))
return -EIO;
DBG(5, "VIDIOCSPICT successfully called")
return 0;
}
case VIDIOCSWIN: /* set capture area */
{
struct video_window win;
int err = 0;
if (copy_from_user(&win, arg, sizeof(win)))
return -EFAULT;
DBG(6, "VIDIOCSWIN called: clipcount=%d, flags=%u, "
"x=%u, y=%u, %ux%u", win.clipcount, win.flags,
win.x, win.y, win.width, win.height)
if (win.clipcount != 0 || win.flags != 0)
return -EINVAL;
if ((err = w9968cf_adjust_window_size(cam, (u16*)&win.width,
(u16*)&win.height))) {
DBG(4, "Resolution not supported (%ux%u). "
"VIDIOCSWIN failed", win.width, win.height)
return err;
}
if (win.x != cam->window.x ||
win.y != cam->window.y ||
win.width != cam->window.width ||
win.height != cam->window.height) {
if(*cam->requested_frame
|| cam->frame_current->queued) {
err = wait_event_interruptible
( cam->wait_queue,
cam->disconnected ||
(!*cam->requested_frame &&
!cam->frame_current->queued) );
if (err)
return err;
if (cam->disconnected)
return -ENODEV;
}
if (w9968cf_stop_transfer(cam))
goto ioctl_fail;
/* This _must_ be called before set_window() */
if (w9968cf_set_picture(cam, cam->picture))
goto ioctl_fail;
if (w9968cf_set_window(cam, win))
goto ioctl_fail;
if (w9968cf_start_transfer(cam))
goto ioctl_fail;
}
DBG(5, "VIDIOCSWIN successfully called. ")
return 0;
}
case VIDIOCGWIN: /* get current window properties */
{
if (copy_to_user(arg,&cam->window,sizeof(struct video_window)))
return -EFAULT;
DBG(5, "VIDIOCGWIN successfully called")
return 0;
}
case VIDIOCGMBUF: /* request for memory (mapped) buffer */
{
struct video_mbuf mbuf;
u8 i;
mbuf.size = cam->nbuffers * cam->frame[0].size;
mbuf.frames = cam->nbuffers;
for (i = 0; i < cam->nbuffers; i++)
mbuf.offsets[i] = (unsigned long)cam->frame[i].buffer -
(unsigned long)cam->frame[0].buffer;
if (copy_to_user(arg, &mbuf, sizeof(mbuf)))
return -EFAULT;
DBG(5, "VIDIOCGMBUF successfully called")
return 0;
}
case VIDIOCMCAPTURE: /* start the capture to a frame */
{
struct video_mmap mmap;
struct w9968cf_frame_t* fr;
int err = 0;
if (copy_from_user(&mmap, arg, sizeof(mmap)))
return -EFAULT;
DBG(6, "VIDIOCMCAPTURE called: frame #%u, format=%s, %dx%d",
mmap.frame, symbolic(v4l1_plist, mmap.format),
mmap.width, mmap.height)
if (mmap.frame >= cam->nbuffers) {
DBG(4, "Invalid frame number (%u). "
"VIDIOCMCAPTURE failed", mmap.frame)
return -EINVAL;
}
if (mmap.format!=cam->picture.palette &&
(cam->force_palette || !w9968cf_vpp)) {
DBG(4, "Palette %s rejected: only %s is allowed",
symbolic(v4l1_plist, mmap.format),
symbolic(v4l1_plist, cam->picture.palette))
return -EINVAL;
}
if (!w9968cf_valid_palette(mmap.format)) {
DBG(4, "Palette %s not supported. "
"VIDIOCMCAPTURE failed",
symbolic(v4l1_plist, mmap.format))
return -EINVAL;
}
if (!cam->force_palette) {
if (cam->decompression == 0) {
if (w9968cf_need_decompression(mmap.format)) {
DBG(4, "Decompression disabled: palette %s is not "
"allowed. VIDIOCSPICT failed",
symbolic(v4l1_plist, mmap.format))
return -EINVAL;
}
} else if (cam->decompression == 1) {
if (!w9968cf_need_decompression(mmap.format)) {
DBG(4, "Decompression forced: palette %s is not "
"allowed. VIDIOCSPICT failed",
symbolic(v4l1_plist, mmap.format))
return -EINVAL;
}
}
}
if ((err = w9968cf_adjust_window_size(cam, (u16*)&mmap.width,
(u16*)&mmap.height))) {
DBG(4, "Resolution not supported (%dx%d). "
"VIDIOCMCAPTURE failed",
mmap.width, mmap.height)
return err;
}
fr = &cam->frame[mmap.frame];
if (mmap.width != cam->window.width ||
mmap.height != cam->window.height ||
mmap.format != cam->picture.palette) {
struct video_window win;
struct video_picture pict;
if(*cam->requested_frame
|| cam->frame_current->queued) {
DBG(6, "VIDIOCMCAPTURE. Change settings for "
"frame #%u: %dx%d, format %s. Wait...",
mmap.frame, mmap.width, mmap.height,
symbolic(v4l1_plist, mmap.format))
err = wait_event_interruptible
( cam->wait_queue,
cam->disconnected ||
(!*cam->requested_frame &&
!cam->frame_current->queued) );
if (err)
return err;
if (cam->disconnected)
return -ENODEV;
}
memcpy(&win, &cam->window, sizeof(win));
memcpy(&pict, &cam->picture, sizeof(pict));
win.width = mmap.width;
win.height = mmap.height;
pict.palette = mmap.format;
if (w9968cf_stop_transfer(cam))
goto ioctl_fail;
/* This before set_window */
if (w9968cf_set_picture(cam, pict))
goto ioctl_fail;
if (w9968cf_set_window(cam, win))
goto ioctl_fail;
if (w9968cf_start_transfer(cam))
goto ioctl_fail;
} else if (fr->queued) {
DBG(6, "Wait until frame #%u is free", mmap.frame)
err = wait_event_interruptible(cam->wait_queue,
cam->disconnected ||
(!fr->queued));
if (err)
return err;
if (cam->disconnected)
return -ENODEV;
}
w9968cf_push_frame(cam, mmap.frame);
DBG(5, "VIDIOCMCAPTURE(%u): successfully called", mmap.frame)
return 0;
}
case VIDIOCSYNC: /* wait until the capture of a frame is finished */
{
unsigned int f_num;
struct w9968cf_frame_t* fr;
int err = 0;
if (copy_from_user(&f_num, arg, sizeof(f_num)))
return -EFAULT;
if (f_num >= cam->nbuffers) {
DBG(4, "Invalid frame number (%u). "
"VIDIOCMCAPTURE failed", f_num)
return -EINVAL;
}
DBG(6, "VIDIOCSYNC called for frame #%u", f_num)
fr = &cam->frame[f_num];
switch (fr->status) {
case F_UNUSED:
if (!fr->queued) {
DBG(4, "VIDIOSYNC: Frame #%u not requested!",
f_num)
return -EFAULT;
}
case F_ERROR:
case F_GRABBING:
err = wait_event_interruptible(cam->wait_queue,
(fr->status == F_READY)
|| cam->disconnected);
if (err)
return err;
if (cam->disconnected)
return -ENODEV;
break;
case F_READY:
break;
}
if (w9968cf_vpp)
w9968cf_postprocess_frame(cam, fr);
fr->status = F_UNUSED;
DBG(5, "VIDIOCSYNC(%u) successfully called", f_num)
return 0;
}
case VIDIOCGUNIT:/* report the unit numbers of the associated devices*/
{
struct video_unit unit = {
.video = cam->v4ldev->minor,
.vbi = VIDEO_NO_UNIT,
.radio = VIDEO_NO_UNIT,
.audio = VIDEO_NO_UNIT,
.teletext = VIDEO_NO_UNIT,
};
if (copy_to_user(arg, &unit, sizeof(unit)))
return -EFAULT;
DBG(5, "VIDIOCGUNIT successfully called")
return 0;
}
case VIDIOCKEY:
return 0;
case VIDIOCGFBUF:
{
if (clear_user(arg, sizeof(struct video_buffer)))
return -EFAULT;
DBG(5, "VIDIOCGFBUF successfully called")
return 0;
}
case VIDIOCGTUNER:
{
struct video_tuner tuner;
if (copy_from_user(&tuner, arg, sizeof(tuner)))
return -EFAULT;
if (tuner.tuner != 0)
return -EINVAL;
strcpy(tuner.name, "no_tuner");
tuner.rangelow = 0;
tuner.rangehigh = 0;
tuner.flags = VIDEO_TUNER_NORM;
tuner.mode = VIDEO_MODE_AUTO;
tuner.signal = 0xffff;
if (copy_to_user(arg, &tuner, sizeof(tuner)))
return -EFAULT;
DBG(5, "VIDIOCGTUNER successfully called")
return 0;
}
case VIDIOCSTUNER:
{
struct video_tuner tuner;
if (copy_from_user(&tuner, arg, sizeof(tuner)))
return -EFAULT;
if (tuner.tuner != 0)
return -EINVAL;
if (tuner.mode != VIDEO_MODE_AUTO)
return -EINVAL;
DBG(5, "VIDIOCSTUNER successfully called")
return 0;
}
case VIDIOCSFBUF:
case VIDIOCCAPTURE:
case VIDIOCGFREQ:
case VIDIOCSFREQ:
case VIDIOCGAUDIO:
case VIDIOCSAUDIO:
case VIDIOCSPLAYMODE:
case VIDIOCSWRITEMODE:
case VIDIOCGPLAYINFO:
case VIDIOCSMICROCODE:
case VIDIOCGVBIFMT:
case VIDIOCSVBIFMT:
DBG(4, "Unsupported V4L1 IOCtl: VIDIOC%s "
"(type 0x%01X, "
"n. 0x%01X, "
"dir. 0x%01X, "
"size 0x%02X)",
V4L1_IOCTL(cmd),
_IOC_TYPE(cmd),_IOC_NR(cmd),_IOC_DIR(cmd),_IOC_SIZE(cmd))
return -EINVAL;
default:
DBG(4, "Invalid V4L1 IOCtl: VIDIOC%s "
"type 0x%01X, "
"n. 0x%01X, "
"dir. 0x%01X, "
"size 0x%02X",
V4L1_IOCTL(cmd),
_IOC_TYPE(cmd),_IOC_NR(cmd),_IOC_DIR(cmd),_IOC_SIZE(cmd))
return -ENOIOCTLCMD;
} /* end of switch */
ioctl_fail:
cam->misconfigured = 1;
DBG(1, "VIDIOC%s failed because of hardware problems. "
"To use the camera, close and open it again.", V4L1_IOCTL(cmd))
return -EFAULT;
}
static const struct v4l2_file_operations w9968cf_fops = {
.owner = THIS_MODULE,
.open = w9968cf_open,
.release = w9968cf_release,
.read = w9968cf_read,
.ioctl = w9968cf_ioctl,
.mmap = w9968cf_mmap,
};
/****************************************************************************
* USB probe and V4L registration, disconnect and id_table[] definition *
****************************************************************************/
static int
w9968cf_usb_probe(struct usb_interface* intf, const struct usb_device_id* id)
{
struct usb_device *udev = interface_to_usbdev(intf);
struct w9968cf_device* cam;
int err = 0;
enum w9968cf_model_id mod_id;
struct list_head* ptr;
u8 sc = 0; /* number of simultaneous cameras */
static unsigned short dev_nr; /* 0 - we are handling device number n */
static unsigned short addrs[] = {
OV7xx0_SID,
OV6xx0_SID,
I2C_CLIENT_END
};
if (le16_to_cpu(udev->descriptor.idVendor) == winbond_id_table[0].idVendor &&
le16_to_cpu(udev->descriptor.idProduct) == winbond_id_table[0].idProduct)
mod_id = W9968CF_MOD_CLVBWGP; /* see camlist[] table */
else if (le16_to_cpu(udev->descriptor.idVendor) == winbond_id_table[1].idVendor &&
le16_to_cpu(udev->descriptor.idProduct) == winbond_id_table[1].idProduct)
mod_id = W9968CF_MOD_GENERIC; /* see camlist[] table */
else
return -ENODEV;
cam = (struct w9968cf_device*)
kzalloc(sizeof(struct w9968cf_device), GFP_KERNEL);
if (!cam)
return -ENOMEM;
err = v4l2_device_register(&udev->dev, &cam->v4l2_dev);
if (err)
goto fail0;
mutex_init(&cam->dev_mutex);
mutex_lock(&cam->dev_mutex);
cam->usbdev = udev;
DBG(2, "%s detected", symbolic(camlist, mod_id))
if (simcams > W9968CF_MAX_DEVICES)
simcams = W9968CF_SIMCAMS;
/* How many cameras are connected ? */
mutex_lock(&w9968cf_devlist_mutex);
list_for_each(ptr, &w9968cf_dev_list)
sc++;
mutex_unlock(&w9968cf_devlist_mutex);
if (sc >= simcams) {
DBG(2, "Device rejected: too many connected cameras "
"(max. %u)", simcams)
err = -EPERM;
goto fail;
}
/* Allocate 2 bytes of memory for camera control USB transfers */
if (!(cam->control_buffer = kzalloc(2, GFP_KERNEL))) {
DBG(1,"Couldn't allocate memory for camera control transfers")
err = -ENOMEM;
goto fail;
}
/* Allocate 8 bytes of memory for USB data transfers to the FSB */
if (!(cam->data_buffer = kzalloc(8, GFP_KERNEL))) {
DBG(1, "Couldn't allocate memory for data "
"transfers to the FSB")
err = -ENOMEM;
goto fail;
}
/* Register the V4L device */
cam->v4ldev = video_device_alloc();
if (!cam->v4ldev) {
DBG(1, "Could not allocate memory for a V4L structure")
err = -ENOMEM;
goto fail;
}
strcpy(cam->v4ldev->name, symbolic(camlist, mod_id));
cam->v4ldev->fops = &w9968cf_fops;
cam->v4ldev->minor = video_nr[dev_nr];
cam->v4ldev->release = video_device_release;
video_set_drvdata(cam->v4ldev, cam);
cam->v4ldev->v4l2_dev = &cam->v4l2_dev;
err = video_register_device(cam->v4ldev, VFL_TYPE_GRABBER,
video_nr[dev_nr]);
if (err) {
DBG(1, "V4L device registration failed")
if (err == -ENFILE && video_nr[dev_nr] == -1)
DBG(2, "Couldn't find a free /dev/videoX node")
video_nr[dev_nr] = -1;
dev_nr = (dev_nr < W9968CF_MAX_DEVICES-1) ? dev_nr+1 : 0;
goto fail;
}
DBG(2, "V4L device registered as /dev/video%d", cam->v4ldev->num)
/* Set some basic constants */
w9968cf_configure_camera(cam, udev, mod_id, dev_nr);
/* Add a new entry into the list of V4L registered devices */
mutex_lock(&w9968cf_devlist_mutex);
list_add(&cam->v4llist, &w9968cf_dev_list);
mutex_unlock(&w9968cf_devlist_mutex);
dev_nr = (dev_nr < W9968CF_MAX_DEVICES-1) ? dev_nr+1 : 0;
w9968cf_turn_on_led(cam);
w9968cf_i2c_init(cam);
cam->sensor_sd = v4l2_i2c_new_probed_subdev(&cam->i2c_adapter,
"ovcamchip", "ovcamchip", addrs);
usb_set_intfdata(intf, cam);
mutex_unlock(&cam->dev_mutex);
err = w9968cf_sensor_init(cam);
return 0;
fail: /* Free unused memory */
kfree(cam->control_buffer);
kfree(cam->data_buffer);
if (cam->v4ldev)
video_device_release(cam->v4ldev);
mutex_unlock(&cam->dev_mutex);
v4l2_device_unregister(&cam->v4l2_dev);
fail0:
kfree(cam);
return err;
}
static void w9968cf_usb_disconnect(struct usb_interface* intf)
{
struct w9968cf_device* cam =
(struct w9968cf_device*)usb_get_intfdata(intf);
if (cam) {
down_write(&w9968cf_disconnect);
/* Prevent concurrent accesses to data */
mutex_lock(&cam->dev_mutex);
cam->disconnected = 1;
DBG(2, "Disconnecting %s...", symbolic(camlist, cam->id))
wake_up_interruptible_all(&cam->open);
if (cam->users) {
DBG(2, "The device is open (/dev/video%d)! "
"Process name: %s. Deregistration and memory "
"deallocation are deferred on close.",
cam->v4ldev->num, cam->command)
cam->misconfigured = 1;
w9968cf_stop_transfer(cam);
wake_up_interruptible(&cam->wait_queue);
} else
w9968cf_release_resources(cam);
mutex_unlock(&cam->dev_mutex);
up_write(&w9968cf_disconnect);
if (!cam->users) {
kfree(cam);
}
}
}
static struct usb_driver w9968cf_usb_driver = {
.name = "w9968cf",
.id_table = winbond_id_table,
.probe = w9968cf_usb_probe,
.disconnect = w9968cf_usb_disconnect,
};
/****************************************************************************
* Module init, exit and intermodule communication *
****************************************************************************/
static int __init w9968cf_module_init(void)
{
int err;
KDBG(2, W9968CF_MODULE_NAME" "W9968CF_MODULE_VERSION)
KDBG(3, W9968CF_MODULE_AUTHOR)
if ((err = usb_register(&w9968cf_usb_driver)))
return err;
return 0;
}
static void __exit w9968cf_module_exit(void)
{
/* w9968cf_usb_disconnect() will be called */
usb_deregister(&w9968cf_usb_driver);
KDBG(2, W9968CF_MODULE_NAME" deregistered")
}
module_init(w9968cf_module_init);
module_exit(w9968cf_module_exit);
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