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linux-stable/drivers/media/video/gspca/pac207.c
Hans de Goede 0e4a90993d V4L/DVB (12617): gspca_pac207: enable higher framerates / lower exposure settings 
Now that we've figured out the higher compression settings (supported in
libv4l-0.6.0 and later, so after this patch the driver should be used with
libv4l-0.6.0 or higher only!), we can enable higher framerates. Which
means lower exposure times, which is important for the use of the pac207
in full daylight.

This patch also tweakes the brightness default and the per color gain
balances to use the values which are adviced by Pixart in the pac207
application note.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2009-09-12 12:19:53 -03:00

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/*
* Pixart PAC207BCA library
*
* Copyright (C) 2008 Hans de Goede <hdgoede@redhat.com>
* Copyright (C) 2005 Thomas Kaiser thomas@kaiser-linux.li
* Copyleft (C) 2005 Michel Xhaard mxhaard@magic.fr
*
* V4L2 by Jean-Francois Moine <http://moinejf.free.fr>
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#define MODULE_NAME "pac207"
#include "gspca.h"
MODULE_AUTHOR("Hans de Goede <hdgoede@redhat.com>");
MODULE_DESCRIPTION("Pixart PAC207");
MODULE_LICENSE("GPL");
#define PAC207_CTRL_TIMEOUT 100 /* ms */
#define PAC207_BRIGHTNESS_MIN 0
#define PAC207_BRIGHTNESS_MAX 255
#define PAC207_BRIGHTNESS_DEFAULT 46
#define PAC207_EXPOSURE_MIN 3
#define PAC207_EXPOSURE_MAX 26
#define PAC207_EXPOSURE_DEFAULT 5 /* power on default: 3 */
#define PAC207_EXPOSURE_KNEE 8 /* 4 = 30 fps, 11 = 8, 15 = 6 */
#define PAC207_GAIN_MIN 0
#define PAC207_GAIN_MAX 31
#define PAC207_GAIN_DEFAULT 9 /* power on default: 9 */
#define PAC207_GAIN_KNEE 31
#define PAC207_AUTOGAIN_DEADZONE 30
/* specific webcam descriptor */
struct sd {
struct gspca_dev gspca_dev; /* !! must be the first item */
u8 mode;
u8 brightness;
u8 exposure;
u8 autogain;
u8 gain;
u8 sof_read;
u8 header_read;
u8 autogain_ignore_frames;
atomic_t avg_lum;
};
/* V4L2 controls supported by the driver */
static int sd_setbrightness(struct gspca_dev *gspca_dev, __s32 val);
static int sd_getbrightness(struct gspca_dev *gspca_dev, __s32 *val);
static int sd_setexposure(struct gspca_dev *gspca_dev, __s32 val);
static int sd_getexposure(struct gspca_dev *gspca_dev, __s32 *val);
static int sd_setautogain(struct gspca_dev *gspca_dev, __s32 val);
static int sd_getautogain(struct gspca_dev *gspca_dev, __s32 *val);
static int sd_setgain(struct gspca_dev *gspca_dev, __s32 val);
static int sd_getgain(struct gspca_dev *gspca_dev, __s32 *val);
static struct ctrl sd_ctrls[] = {
#define SD_BRIGHTNESS 0
{
{
.id = V4L2_CID_BRIGHTNESS,
.type = V4L2_CTRL_TYPE_INTEGER,
.name = "Brightness",
.minimum = PAC207_BRIGHTNESS_MIN,
.maximum = PAC207_BRIGHTNESS_MAX,
.step = 1,
.default_value = PAC207_BRIGHTNESS_DEFAULT,
.flags = 0,
},
.set = sd_setbrightness,
.get = sd_getbrightness,
},
#define SD_EXPOSURE 1
{
{
.id = V4L2_CID_EXPOSURE,
.type = V4L2_CTRL_TYPE_INTEGER,
.name = "exposure",
.minimum = PAC207_EXPOSURE_MIN,
.maximum = PAC207_EXPOSURE_MAX,
.step = 1,
.default_value = PAC207_EXPOSURE_DEFAULT,
.flags = 0,
},
.set = sd_setexposure,
.get = sd_getexposure,
},
#define SD_AUTOGAIN 2
{
{
.id = V4L2_CID_AUTOGAIN,
.type = V4L2_CTRL_TYPE_BOOLEAN,
.name = "Auto Gain",
.minimum = 0,
.maximum = 1,
.step = 1,
#define AUTOGAIN_DEF 1
.default_value = AUTOGAIN_DEF,
.flags = 0,
},
.set = sd_setautogain,
.get = sd_getautogain,
},
#define SD_GAIN 3
{
{
.id = V4L2_CID_GAIN,
.type = V4L2_CTRL_TYPE_INTEGER,
.name = "gain",
.minimum = PAC207_GAIN_MIN,
.maximum = PAC207_GAIN_MAX,
.step = 1,
.default_value = PAC207_GAIN_DEFAULT,
.flags = 0,
},
.set = sd_setgain,
.get = sd_getgain,
},
};
static const struct v4l2_pix_format sif_mode[] = {
{176, 144, V4L2_PIX_FMT_PAC207, V4L2_FIELD_NONE,
.bytesperline = 176,
.sizeimage = (176 + 2) * 144,
/* uncompressed, add 2 bytes / line for line header */
.colorspace = V4L2_COLORSPACE_SRGB,
.priv = 1},
{352, 288, V4L2_PIX_FMT_PAC207, V4L2_FIELD_NONE,
.bytesperline = 352,
/* compressed, but only when needed (not compressed
when the framerate is low) */
.sizeimage = (352 + 2) * 288,
.colorspace = V4L2_COLORSPACE_SRGB,
.priv = 0},
};
static const __u8 pac207_sensor_init[][8] = {
{0x10, 0x12, 0x0d, 0x12, 0x0c, 0x01, 0x29, 0x84},
{0x49, 0x64, 0x64, 0x64, 0x04, 0x10, 0xf0, 0x30},
{0x00, 0x00, 0x00, 0x70, 0xa0, 0xf8, 0x00, 0x00},
{0x32, 0x00, 0x96, 0x00, 0xA2, 0x02, 0xaf, 0x00},
};
static int pac207_write_regs(struct gspca_dev *gspca_dev, u16 index,
const u8 *buffer, u16 length)
{
struct usb_device *udev = gspca_dev->dev;
int err;
memcpy(gspca_dev->usb_buf, buffer, length);
err = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x01,
USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
0x00, index,
gspca_dev->usb_buf, length, PAC207_CTRL_TIMEOUT);
if (err < 0)
PDEBUG(D_ERR,
"Failed to write registers to index 0x%04X, error %d)",
index, err);
return err;
}
static int pac207_write_reg(struct gspca_dev *gspca_dev, u16 index, u16 value)
{
struct usb_device *udev = gspca_dev->dev;
int err;
err = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x00,
USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
value, index, NULL, 0, PAC207_CTRL_TIMEOUT);
if (err)
PDEBUG(D_ERR, "Failed to write a register (index 0x%04X,"
" value 0x%02X, error %d)", index, value, err);
return err;
}
static int pac207_read_reg(struct gspca_dev *gspca_dev, u16 index)
{
struct usb_device *udev = gspca_dev->dev;
int res;
res = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 0x00,
USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
0x00, index,
gspca_dev->usb_buf, 1, PAC207_CTRL_TIMEOUT);
if (res < 0) {
PDEBUG(D_ERR,
"Failed to read a register (index 0x%04X, error %d)",
index, res);
return res;
}
return gspca_dev->usb_buf[0];
}
/* this function is called at probe time */
static int sd_config(struct gspca_dev *gspca_dev,
const struct usb_device_id *id)
{
struct sd *sd = (struct sd *) gspca_dev;
struct cam *cam;
u8 idreg[2];
idreg[0] = pac207_read_reg(gspca_dev, 0x0000);
idreg[1] = pac207_read_reg(gspca_dev, 0x0001);
idreg[0] = ((idreg[0] & 0x0F) << 4) | ((idreg[1] & 0xf0) >> 4);
idreg[1] = idreg[1] & 0x0f;
PDEBUG(D_PROBE, "Pixart Sensor ID 0x%02X Chips ID 0x%02X",
idreg[0], idreg[1]);
if (idreg[0] != 0x27) {
PDEBUG(D_PROBE, "Error invalid sensor ID!");
return -ENODEV;
}
PDEBUG(D_PROBE,
"Pixart PAC207BCA Image Processor and Control Chip detected"
" (vid/pid 0x%04X:0x%04X)", id->idVendor, id->idProduct);
cam = &gspca_dev->cam;
cam->cam_mode = sif_mode;
cam->nmodes = ARRAY_SIZE(sif_mode);
sd->brightness = PAC207_BRIGHTNESS_DEFAULT;
sd->exposure = PAC207_EXPOSURE_DEFAULT;
sd->gain = PAC207_GAIN_DEFAULT;
sd->autogain = AUTOGAIN_DEF;
return 0;
}
/* this function is called at probe and resume time */
static int sd_init(struct gspca_dev *gspca_dev)
{
pac207_write_reg(gspca_dev, 0x41, 0x00);
/* Bit_0=Image Format,
* Bit_1=LED,
* Bit_2=Compression test mode enable */
pac207_write_reg(gspca_dev, 0x0f, 0x00); /* Power Control */
return 0;
}
/* -- start the camera -- */
static int sd_start(struct gspca_dev *gspca_dev)
{
struct sd *sd = (struct sd *) gspca_dev;
__u8 mode;
pac207_write_reg(gspca_dev, 0x0f, 0x10); /* Power control (Bit 6-0) */
pac207_write_regs(gspca_dev, 0x0002, pac207_sensor_init[0], 8);
pac207_write_regs(gspca_dev, 0x000a, pac207_sensor_init[1], 8);
pac207_write_regs(gspca_dev, 0x0012, pac207_sensor_init[2], 8);
pac207_write_regs(gspca_dev, 0x0042, pac207_sensor_init[3], 8);
/* Compression Balance */
if (gspca_dev->width == 176)
pac207_write_reg(gspca_dev, 0x4a, 0xff);
else
pac207_write_reg(gspca_dev, 0x4a, 0x30);
pac207_write_reg(gspca_dev, 0x4b, 0x00); /* Sram test value */
pac207_write_reg(gspca_dev, 0x08, sd->brightness);
/* PGA global gain (Bit 4-0) */
pac207_write_reg(gspca_dev, 0x0e, sd->gain);
pac207_write_reg(gspca_dev, 0x02, sd->exposure); /* PXCK = 12MHz /n */
mode = 0x02; /* Image Format (Bit 0), LED (1), Compr. test mode (2) */
if (gspca_dev->width == 176) { /* 176x144 */
mode |= 0x01;
PDEBUG(D_STREAM, "pac207_start mode 176x144");
} else { /* 352x288 */
PDEBUG(D_STREAM, "pac207_start mode 352x288");
}
pac207_write_reg(gspca_dev, 0x41, mode);
pac207_write_reg(gspca_dev, 0x13, 0x01); /* Bit 0, auto clear */
pac207_write_reg(gspca_dev, 0x1c, 0x01); /* not documented */
msleep(10);
pac207_write_reg(gspca_dev, 0x40, 0x01); /* Start ISO pipe */
sd->sof_read = 0;
sd->autogain_ignore_frames = 0;
atomic_set(&sd->avg_lum, -1);
return 0;
}
static void sd_stopN(struct gspca_dev *gspca_dev)
{
pac207_write_reg(gspca_dev, 0x40, 0x00); /* Stop ISO pipe */
pac207_write_reg(gspca_dev, 0x41, 0x00); /* Turn of LED */
pac207_write_reg(gspca_dev, 0x0f, 0x00); /* Power Control */
}
/* Include pac common sof detection functions */
#include "pac_common.h"
static void pac207_do_auto_gain(struct gspca_dev *gspca_dev)
{
struct sd *sd = (struct sd *) gspca_dev;
int avg_lum = atomic_read(&sd->avg_lum);
if (avg_lum == -1)
return;
if (sd->autogain_ignore_frames > 0)
sd->autogain_ignore_frames--;
else if (gspca_auto_gain_n_exposure(gspca_dev, avg_lum,
100, PAC207_AUTOGAIN_DEADZONE,
PAC207_GAIN_KNEE, PAC207_EXPOSURE_KNEE))
sd->autogain_ignore_frames = PAC_AUTOGAIN_IGNORE_FRAMES;
}
static void sd_pkt_scan(struct gspca_dev *gspca_dev,
struct gspca_frame *frame,
__u8 *data,
int len)
{
struct sd *sd = (struct sd *) gspca_dev;
unsigned char *sof;
sof = pac_find_sof(gspca_dev, data, len);
if (sof) {
int n;
/* finish decoding current frame */
n = sof - data;
if (n > sizeof pac_sof_marker)
n -= sizeof pac_sof_marker;
else
n = 0;
frame = gspca_frame_add(gspca_dev, LAST_PACKET, frame,
data, n);
sd->header_read = 0;
gspca_frame_add(gspca_dev, FIRST_PACKET, frame, NULL, 0);
len -= sof - data;
data = sof;
}
if (sd->header_read < 11) {
int needed;
/* get average lumination from frame header (byte 5) */
if (sd->header_read < 5) {
needed = 5 - sd->header_read;
if (len >= needed)
atomic_set(&sd->avg_lum, data[needed - 1]);
}
/* skip the rest of the header */
needed = 11 - sd->header_read;
if (len <= needed) {
sd->header_read += len;
return;
}
data += needed;
len -= needed;
sd->header_read = 11;
}
gspca_frame_add(gspca_dev, INTER_PACKET, frame, data, len);
}
static void setbrightness(struct gspca_dev *gspca_dev)
{
struct sd *sd = (struct sd *) gspca_dev;
pac207_write_reg(gspca_dev, 0x08, sd->brightness);
pac207_write_reg(gspca_dev, 0x13, 0x01); /* Bit 0, auto clear */
pac207_write_reg(gspca_dev, 0x1c, 0x01); /* not documented */
}
static void setexposure(struct gspca_dev *gspca_dev)
{
struct sd *sd = (struct sd *) gspca_dev;
pac207_write_reg(gspca_dev, 0x02, sd->exposure);
pac207_write_reg(gspca_dev, 0x13, 0x01); /* Bit 0, auto clear */
pac207_write_reg(gspca_dev, 0x1c, 0x01); /* not documented */
}
static void setgain(struct gspca_dev *gspca_dev)
{
struct sd *sd = (struct sd *) gspca_dev;
pac207_write_reg(gspca_dev, 0x0e, sd->gain);
pac207_write_reg(gspca_dev, 0x13, 0x01); /* Bit 0, auto clear */
pac207_write_reg(gspca_dev, 0x1c, 0x01); /* not documented */
}
static int sd_setbrightness(struct gspca_dev *gspca_dev, __s32 val)
{
struct sd *sd = (struct sd *) gspca_dev;
sd->brightness = val;
if (gspca_dev->streaming)
setbrightness(gspca_dev);
return 0;
}
static int sd_getbrightness(struct gspca_dev *gspca_dev, __s32 *val)
{
struct sd *sd = (struct sd *) gspca_dev;
*val = sd->brightness;
return 0;
}
static int sd_setexposure(struct gspca_dev *gspca_dev, __s32 val)
{
struct sd *sd = (struct sd *) gspca_dev;
sd->exposure = val;
if (gspca_dev->streaming)
setexposure(gspca_dev);
return 0;
}
static int sd_getexposure(struct gspca_dev *gspca_dev, __s32 *val)
{
struct sd *sd = (struct sd *) gspca_dev;
*val = sd->exposure;
return 0;
}
static int sd_setgain(struct gspca_dev *gspca_dev, __s32 val)
{
struct sd *sd = (struct sd *) gspca_dev;
sd->gain = val;
if (gspca_dev->streaming)
setgain(gspca_dev);
return 0;
}
static int sd_getgain(struct gspca_dev *gspca_dev, __s32 *val)
{
struct sd *sd = (struct sd *) gspca_dev;
*val = sd->gain;
return 0;
}
static int sd_setautogain(struct gspca_dev *gspca_dev, __s32 val)
{
struct sd *sd = (struct sd *) gspca_dev;
sd->autogain = val;
/* when switching to autogain set defaults to make sure
we are on a valid point of the autogain gain /
exposure knee graph, and give this change time to
take effect before doing autogain. */
if (sd->autogain) {
sd->exposure = PAC207_EXPOSURE_DEFAULT;
sd->gain = PAC207_GAIN_DEFAULT;
if (gspca_dev->streaming) {
sd->autogain_ignore_frames =
PAC_AUTOGAIN_IGNORE_FRAMES;
setexposure(gspca_dev);
setgain(gspca_dev);
}
}
return 0;
}
static int sd_getautogain(struct gspca_dev *gspca_dev, __s32 *val)
{
struct sd *sd = (struct sd *) gspca_dev;
*val = sd->autogain;
return 0;
}
/* sub-driver description */
static const struct sd_desc sd_desc = {
.name = MODULE_NAME,
.ctrls = sd_ctrls,
.nctrls = ARRAY_SIZE(sd_ctrls),
.config = sd_config,
.init = sd_init,
.start = sd_start,
.stopN = sd_stopN,
.dq_callback = pac207_do_auto_gain,
.pkt_scan = sd_pkt_scan,
};
/* -- module initialisation -- */
static const __devinitdata struct usb_device_id device_table[] = {
{USB_DEVICE(0x041e, 0x4028)},
{USB_DEVICE(0x093a, 0x2460)},
{USB_DEVICE(0x093a, 0x2461)},
{USB_DEVICE(0x093a, 0x2463)},
{USB_DEVICE(0x093a, 0x2464)},
{USB_DEVICE(0x093a, 0x2468)},
{USB_DEVICE(0x093a, 0x2470)},
{USB_DEVICE(0x093a, 0x2471)},
{USB_DEVICE(0x093a, 0x2472)},
{USB_DEVICE(0x093a, 0x2474)},
{USB_DEVICE(0x093a, 0x2476)},
{USB_DEVICE(0x145f, 0x013a)},
{USB_DEVICE(0x2001, 0xf115)},
{}
};
MODULE_DEVICE_TABLE(usb, device_table);
/* -- device connect -- */
static int sd_probe(struct usb_interface *intf,
const struct usb_device_id *id)
{
return gspca_dev_probe(intf, id, &sd_desc, sizeof(struct sd),
THIS_MODULE);
}
static struct usb_driver sd_driver = {
.name = MODULE_NAME,
.id_table = device_table,
.probe = sd_probe,
.disconnect = gspca_disconnect,
#ifdef CONFIG_PM
.suspend = gspca_suspend,
.resume = gspca_resume,
#endif
};
/* -- module insert / remove -- */
static int __init sd_mod_init(void)
{
int ret;
ret = usb_register(&sd_driver);
if (ret < 0)
return ret;
PDEBUG(D_PROBE, "registered");
return 0;
}
static void __exit sd_mod_exit(void)
{
usb_deregister(&sd_driver);
PDEBUG(D_PROBE, "deregistered");
}
module_init(sd_mod_init);
module_exit(sd_mod_exit);
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