* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "gspca.h"
MODULE_LICENSE("GPL");
/*
-Exposure reg is linear with exposure time
-Exposure (sec), E (reg)
-0.000400, 0x0002
-0.001000, 0x0005
-0.005000, 0x0019
-0.020000, 0x0064
-0.080000, 0x0190
-0.400000, 0x07D0
-1.000000, 0x1388
-2.000000, 0x2710
-
-Three gain stages
-0x1000: master channel enable bit
-0x007F: low gain bits
-0x0080: medium gain bit
-0x0100: high gain bit
-gain = enable * (1 + regH) * (1 + regM) * z * regL
-
-Gain implementation
-Want to do something similar to mt9v011.c's set_balance
-
-Gain does not vary with resolution (checked 640x480 vs 1600x1200)
-
-Constant derivation:
-
-Raw data:
-Gain, GTOP, B, R, GBOT
-1.00, 0x105C, 0x1068, 0x10C8, 0x105C
-1.20, 0x106E, 0x107E, 0x10D6, 0x106E
-1.40, 0x10C0, 0x10CA, 0x10E5, 0x10C0
-1.60, 0x10C9, 0x10D4, 0x10F3, 0x10C9
-1.80, 0x10D2, 0x10DE, 0x11C1, 0x10D2
-2.00, 0x10DC, 0x10E9, 0x11C8, 0x10DC
-2.20, 0x10E5, 0x10F3, 0x11CF, 0x10E5
-2.40, 0x10EE, 0x10FE, 0x11D7, 0x10EE
-2.60, 0x10F7, 0x11C4, 0x11DE, 0x10F7
-2.80, 0x11C0, 0x11CA, 0x11E5, 0x11C0
-3.00, 0x11C5, 0x11CF, 0x11ED, 0x11C5
-
-zR = 0.0069605943152454778
- about 3/431 = 0.0069605568445475635
-zB = 0.0095695970695970703
- about 6/627 = 0.0095693779904306216
-zG = 0.010889328063241107
- about 6/551 = 0.010889292196007259
-about 10 bits for constant + 7 bits for value => at least 17 bit intermediate
-with 32 bit ints should be fine for overflow etc
-Essentially gains are in range 0-0x001FF
-
-However, V4L expects a main gain channel + R and B balance
-To keep things simple for now saturate the values of balance is too high/low
-This isn't really ideal but easy way to fit the Linux model
-
-Converted using gain model turns out to be quite linear:
-Gain, GTOP, B, R, GBOT
-1.00, 92, 104, 144, 92
-1.20, 110, 126, 172, 110
-1.40, 128, 148, 202, 128
-1.60, 146, 168, 230, 146
-1.80, 164, 188, 260, 164
-2.00, 184, 210, 288, 184
-2.20, 202, 230, 316, 202
-2.40, 220, 252, 348, 220
-2.60, 238, 272, 376, 238
-2.80, 256, 296, 404, 256
-3.00, 276, 316, 436, 276
-
-Maximum gain is 0x7FF * 2 * 2 => 0x1FFC (8188)
-or about 13 effective bits of gain
-The highest the commercial driver goes in my setup 436
-However, because could *maybe* damage circuits
-limit the gain until have a reason to go higher
-Solution: gain clipped and warning emitted
-*/
+ * Exposure reg is linear with exposure time
+ * Exposure (sec), E (reg)
+ * 0.000400, 0x0002
+ * 0.001000, 0x0005
+ * 0.005000, 0x0019
+ * 0.020000, 0x0064
+ * 0.080000, 0x0190
+ * 0.400000, 0x07D0
+ * 1.000000, 0x1388
+ * 2.000000, 0x2710
+ *
+ * Three gain stages
+ * 0x1000: master channel enable bit
+ * 0x007F: low gain bits
+ * 0x0080: medium gain bit
+ * 0x0100: high gain bit
+ * gain = enable * (1 + regH) * (1 + regM) * z * regL
+ *
+ * Gain implementation
+ * Want to do something similar to mt9v011.c's set_balance
+ *
+ * Gain does not vary with resolution (checked 640x480 vs 1600x1200)
+ *
+ * Constant derivation:
+ *
+ * Raw data:
+ * Gain, GTOP, B, R, GBOT
+ * 1.00, 0x105C, 0x1068, 0x10C8, 0x105C
+ * 1.20, 0x106E, 0x107E, 0x10D6, 0x106E
+ * 1.40, 0x10C0, 0x10CA, 0x10E5, 0x10C0
+ * 1.60, 0x10C9, 0x10D4, 0x10F3, 0x10C9
+ * 1.80, 0x10D2, 0x10DE, 0x11C1, 0x10D2
+ * 2.00, 0x10DC, 0x10E9, 0x11C8, 0x10DC
+ * 2.20, 0x10E5, 0x10F3, 0x11CF, 0x10E5
+ * 2.40, 0x10EE, 0x10FE, 0x11D7, 0x10EE
+ * 2.60, 0x10F7, 0x11C4, 0x11DE, 0x10F7
+ * 2.80, 0x11C0, 0x11CA, 0x11E5, 0x11C0
+ * 3.00, 0x11C5, 0x11CF, 0x11ED, 0x11C5
+ *
+ * zR = 0.0069605943152454778
+ * about 3/431 = 0.0069605568445475635
+ * zB = 0.0095695970695970703
+ * about 6/627 = 0.0095693779904306216
+ * zG = 0.010889328063241107
+ * about 6/551 = 0.010889292196007259
+ * about 10 bits for constant + 7 bits for value => at least 17 bit
+ * intermediate with 32 bit ints should be fine for overflow etc
+ * Essentially gains are in range 0-0x001FF
+ *
+ * However, V4L expects a main gain channel + R and B balance
+ * To keep things simple for now saturate the values of balance is too high/low
+ * This isn't really ideal but easy way to fit the Linux model
+ *
+ * Converted using gain model turns out to be quite linear:
+ * Gain, GTOP, B, R, GBOT
+ * 1.00, 92, 104, 144, 92
+ * 1.20, 110, 126, 172, 110
+ * 1.40, 128, 148, 202, 128
+ * 1.60, 146, 168, 230, 146
+ * 1.80, 164, 188, 260, 164
+ * 2.00, 184, 210, 288, 184
+ * 2.20, 202, 230, 316, 202
+ * 2.40, 220, 252, 348, 220
+ * 2.60, 238, 272, 376, 238
+ * 2.80, 256, 296, 404, 256
+ * 3.00, 276, 316, 436, 276
+ *
+ * Maximum gain is 0x7FF * 2 * 2 => 0x1FFC (8188)
+ * or about 13 effective bits of gain
+ * The highest the commercial driver goes in my setup 436
+ * However, because could *maybe* damage circuits
+ * limit the gain until have a reason to go higher
+ * Solution: gain clipped and warning emitted
+ */
#define GAIN_MAX 511
/* Frame sync is a short read */
};
/*
-As theres no known frame sync, the only way to keep synced is to try hard
-to never miss any packets
-*/
+ * As theres no known frame sync, the only way to keep synced is to try hard
+ * to never miss any packets
+ */
#if MAX_NURBS < 4
#error "Not enough URBs in the gspca table"
#endif
char buff[1];
int rc;
- PDEBUG(D_USBO, "reg_w bReq=0x0B, bReqT=0xC0, wVal=0x%04X, wInd=0x%04X\n",
+ PDEBUG(D_USBO,
+ "reg_w bReq=0x0B, bReqT=0xC0, wVal=0x%04X, wInd=0x%04X\n",
value, index);
rc = usb_control_msg(gspca_dev->dev, usb_rcvctrlpipe(gspca_dev->dev, 0),
0x0B, 0xC0, value, index, buff, 1, 500);
static int gainify(int in)
{
/*
- TODO: check if there are any issues with corner cases
- 0x000 (0):0x07F (127): regL
- 0x080 (128) - 0x0FF (255): regM, regL
- 0x100 (256) - max: regH, regM, regL
- */
+ * TODO: check if there are any issues with corner cases
+ * 0x000 (0):0x07F (127): regL
+ * 0x080 (128) - 0x0FF (255): regM, regL
+ * 0x100 (256) - max: regH, regM, regL
+ */
if (in <= 0x7F)
return 0x1000 | in;
else if (in <= 0xFF)
PDEBUG(D_STREAM, "configure()\n");
/*
- First driver sets a sort of encryption key
- A number of futur requests of this type have wValue and wIndex encrypted
- as follows:
- -Compute key = this wValue rotate left by 4 bits
- (decrypt.py rotates right because we are decrypting)
- -Later packets encrypt packets by XOR'ing with key
- XOR encrypt/decrypt is symmetrical
- wValue, and wIndex are encrypted
- bRequest is not and bRequestType is always 0xC0
- This allows resyncing if key is unknown?
- By setting 0 we XOR with 0 and the shifting and XOR drops out
- */
+ * First driver sets a sort of encryption key
+ * A number of futur requests of this type have wValue and wIndex
+ * encrypted as follows:
+ * -Compute key = this wValue rotate left by 4 bits
+ * (decrypt.py rotates right because we are decrypting)
+ * -Later packets encrypt packets by XOR'ing with key
+ * XOR encrypt/decrypt is symmetrical
+ * wValue, and wIndex are encrypted
+ * bRequest is not and bRequestType is always 0xC0
+ * This allows resyncing if key is unknown?
+ * By setting 0 we XOR with 0 and the shifting and XOR drops out
+ */
rc = usb_control_msg(gspca_dev->dev, usb_rcvctrlpipe(gspca_dev->dev, 0),
0x16, 0xC0, 0x0000, 0x0000, buff, 2, 500);
if (val_reply(gspca_dev, buff, rc)) {
}
/*
- Next does some sort of 2 packet challenge / response
- evidence suggests its an Atmel I2C crypto part but nobody cares to look
- (to make sure its not cloned hardware?)
- Ignore: I want to work with their hardware, not clone it
- 16 bytes out challenge, requestType: 0x40
- 16 bytes in response, requestType: 0xC0
- */
+ * Next does some sort of 2 packet challenge / response
+ * evidence suggests its an Atmel I2C crypto part but nobody cares to
+ * look
+ * (to make sure its not cloned hardware?)
+ * Ignore: I want to work with their hardware, not clone it
+ * 16 bytes out challenge, requestType: 0x40
+ * 16 bytes in response, requestType: 0xC0
+ */
rc = usb_control_msg(gspca_dev->dev, usb_sndctrlpipe(gspca_dev->dev, 0),
0x01, 0x40, 0x0001, 0x000F, NULL, 0, 500);
}
/*
- Serial number? Doesn't seem to be required
- cam1: \xE6\x0D\x00\x00, cam2: \x70\x19\x00\x00
- rc = usb_control_msg(gspca_dev->dev, usb_rcvctrlpipe(gspca_dev->dev, 0),
- 0x20, 0xC0, 0x0000, 0x0000, buff, 4, 500);
- */
+ * Serial number? Doesn't seem to be required
+ * cam1: \xE6\x0D\x00\x00, cam2: \x70\x19\x00\x00
+ * rc = usb_control_msg(gspca_dev->dev,
+ * usb_rcvctrlpipe(gspca_dev->dev, 0),
+ * 0x20, 0xC0, 0x0000, 0x0000, buff, 4, 500);
+ */
/* Large (EEPROM?) read, skip it since no idea what to do with it */
gspca_dev->usb_err = 0;
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