path: root/drivers/media/video/gspca/pac7302.c

/*
 *		Pixart PAC7302 library
 *		Copyright (C) 2005 Thomas Kaiser thomas@kaiser-linux.li
 *
 * V4L2 by Jean-Francois Moine <http://moinejf.free.fr>
 *
 * Separated from Pixart PAC7311 library by M�rton N�meth <nm127@freemail.hu>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

/* Some documentation about various registers as determined by trial and error.
   When the register addresses differ between the 7202 and the 7311 the 2
   different addresses are written as 7302addr/7311addr, when one of the 2
   addresses is a - sign that register description is not valid for the
   matching IC.

   Register page 1:

   Address	Description
   -/0x08	Unknown compressor related, must always be 8 except when not
		in 640x480 resolution and page 4 reg 2 <= 3 then set it to 9 !
   -/0x1b	Auto white balance related, bit 0 is AWB enable (inverted)
		bits 345 seem to toggle per color gains on/off (inverted)
   0x78		Global control, bit 6 controls the LED (inverted)
   -/0x80	JPEG compression ratio ? Best not touched

   Register page 3/4:

   Address	Description
   0x02		Clock divider 2-63, fps =~ 60 / val. Must be a multiple of 3 on
		the 7302, so one of 3, 6, 9, ..., except when between 6 and 12?
   -/0x0f	Master gain 1-245, low value = high gain
   0x10/-	Master gain 0-31
   -/0x10	Another gain 0-15, limited influence (1-2x gain I guess)
   0x21		Bitfield: 0-1 unused, 2-3 vflip/hflip, 4-5 unknown, 6-7 unused
   -/0x27	Seems to toggle various gains on / off, Setting bit 7 seems to
		completely disable the analog amplification block. Set to 0x68
		for max gain, 0x14 for minimal gain.

   The registers are accessed in the following functions:

   Page | Register   | Function
   -----+------------+---------------------------------------------------
    0   | 0x0f..0x20 | setcolors()
    0   | 0xa2..0xab | setbrightcont()
    0   | 0xc5       | setredbalance()
    0   | 0xc6       | setwhitebalance()
    0   | 0xc7       | setbluebalance()
    0   | 0xdc       | setbrightcont(), setcolors()
    3   | 0x02       | setexposure()
    3   | 0x10       | setgain()
    3   | 0x11       | setcolors(), setgain(), setexposure(), sethvflip()
    3   | 0x21       | sethvflip()
*/

#define MODULE_NAME "pac7302"

#include <media/v4l2-chip-ident.h>
#include "gspca.h"

MODULE_AUTHOR("Thomas Kaiser thomas@kaiser-linux.li");
MODULE_DESCRIPTION("Pixart PAC7302");
MODULE_LICENSE("GPL");

/* specific webcam descriptor for pac7302 */
struct sd {
	struct gspca_dev gspca_dev;		/* !! must be the first item */

	unsigned char brightness;
	unsigned char contrast;
	unsigned char colors;
	unsigned char white_balance;
	unsigned char red_balance;
	unsigned char blue_balance;
	unsigned char gain;
	unsigned char exposure;
	unsigned char autogain;
	__u8 hflip;
	__u8 vflip;
	u8 flags;
#define FL_HFLIP 0x01		/* mirrored by default */
#define FL_VFLIP 0x02		/* vertical flipped by default */

	u8 sof_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_setcontrast(struct gspca_dev *gspca_dev, __s32 val);
static int sd_getcontrast(struct gspca_dev *gspca_dev, __s32 *val);
static int sd_setcolors(struct gspca_dev *gspca_dev, __s32 val);
static int sd_getcolors(struct gspca_dev *gspca_dev, __s32 *val);
static int sd_setwhitebalance(struct gspca_dev *gspca_dev, __s32 val);
static int sd_getwhitebalance(struct gspca_dev *gspca_dev, __s32 *val);
static int sd_setredbalance(struct