311 lines
14 KiB
C
311 lines
14 KiB
C
/***************************************************************************
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* API for image sensors connected to the SN9C1xx PC Camera Controllers *
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* *
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* Copyright (C) 2004-2007 by Luca Risolia <luca.risolia@studio.unibo.it> *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the Free Software *
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. *
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***************************************************************************/
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#ifndef _SN9C102_SENSOR_H_
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#define _SN9C102_SENSOR_H_
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#include <linux/usb.h>
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#include <linux/videodev2.h>
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#include <linux/device.h>
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#include <linux/stddef.h>
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#include <linux/errno.h>
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#include <asm/types.h>
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struct sn9c102_device;
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struct sn9c102_sensor;
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/*****************************************************************************/
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/*
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OVERVIEW.
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This is a small interface that allows you to add support for any CCD/CMOS
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image sensors connected to the SN9C1XX bridges. The entire API is documented
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below. In the most general case, to support a sensor there are three steps
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you have to follow:
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1) define the main "sn9c102_sensor" structure by setting the basic fields;
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2) write a probing function to be called by the core module when the USB
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camera is recognized, then add both the USB ids and the name of that
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function to the two corresponding tables in sn9c102_devtable.h;
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3) implement the methods that you want/need (and fill the rest of the main
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structure accordingly).
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"sn9c102_pas106b.c" is an example of all this stuff. Remember that you do
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NOT need to touch the source code of the core module for the things to work
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properly, unless you find bugs or flaws in it. Finally, do not forget to
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read the V4L2 API for completeness.
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*/
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/*****************************************************************************/
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enum sn9c102_bridge {
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BRIDGE_SN9C101 = 0x01,
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BRIDGE_SN9C102 = 0x02,
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BRIDGE_SN9C103 = 0x04,
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BRIDGE_SN9C105 = 0x08,
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BRIDGE_SN9C120 = 0x10,
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};
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/* Return the bridge name */
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enum sn9c102_bridge sn9c102_get_bridge(struct sn9c102_device* cam);
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/* Return a pointer the sensor struct attached to the camera */
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struct sn9c102_sensor* sn9c102_get_sensor(struct sn9c102_device* cam);
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/* Identify a device */
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extern struct sn9c102_device*
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sn9c102_match_id(struct sn9c102_device* cam, const struct usb_device_id *id);
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/* Attach a probed sensor to the camera. */
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extern void
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sn9c102_attach_sensor(struct sn9c102_device* cam,
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const struct sn9c102_sensor* sensor);
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/*
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Read/write routines: they always return -1 on error, 0 or the read value
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otherwise. NOTE that a real read operation is not supported by the SN9C1XX
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chip for some of its registers. To work around this problem, a pseudo-read
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call is provided instead: it returns the last successfully written value
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on the register (0 if it has never been written), the usual -1 on error.
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*/
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/* The "try" I2C I/O versions are used when probing the sensor */
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extern int sn9c102_i2c_try_write(struct sn9c102_device*,
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const struct sn9c102_sensor*, u8 address,
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u8 value);
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extern int sn9c102_i2c_try_read(struct sn9c102_device*,
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const struct sn9c102_sensor*, u8 address);
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/*
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These must be used if and only if the sensor doesn't implement the standard
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I2C protocol. There are a number of good reasons why you must use the
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single-byte versions of these functions: do not abuse. The first function
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writes n bytes, from data0 to datan, to registers 0x09 - 0x09+n of SN9C1XX
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chip. The second one programs the registers 0x09 and 0x10 with data0 and
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data1, and places the n bytes read from the sensor register table in the
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buffer pointed by 'buffer'. Both the functions return -1 on error; the write
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version returns 0 on success, while the read version returns the first read
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byte.
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*/
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extern int sn9c102_i2c_try_raw_write(struct sn9c102_device* cam,
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const struct sn9c102_sensor* sensor, u8 n,
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u8 data0, u8 data1, u8 data2, u8 data3,
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u8 data4, u8 data5);
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extern int sn9c102_i2c_try_raw_read(struct sn9c102_device* cam,
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const struct sn9c102_sensor* sensor,
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u8 data0, u8 data1, u8 n, u8 buffer[]);
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/* To be used after the sensor struct has been attached to the camera struct */
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extern int sn9c102_i2c_write(struct sn9c102_device*, u8 address, u8 value);
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extern int sn9c102_i2c_read(struct sn9c102_device*, u8 address);
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/* I/O on registers in the bridge. Could be used by the sensor methods too */
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extern int sn9c102_read_reg(struct sn9c102_device*, u16 index);
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extern int sn9c102_pread_reg(struct sn9c102_device*, u16 index);
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extern int sn9c102_write_reg(struct sn9c102_device*, u8 value, u16 index);
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extern int sn9c102_write_regs(struct sn9c102_device*, const u8 valreg[][2],
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int count);
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/*
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Write multiple registers with constant values. For example:
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sn9c102_write_const_regs(cam, {0x00, 0x14}, {0x60, 0x17}, {0x0f, 0x18});
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Register adresses must be < 256.
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*/
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#define sn9c102_write_const_regs(sn9c102_device, data...) \
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({ const static u8 _valreg[][2] = {data}; \
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sn9c102_write_regs(sn9c102_device, _valreg, ARRAY_SIZE(_valreg)); })
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/*****************************************************************************/
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enum sn9c102_i2c_sysfs_ops {
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SN9C102_I2C_READ = 0x01,
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SN9C102_I2C_WRITE = 0x02,
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};
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enum sn9c102_i2c_frequency { /* sensors may support both the frequencies */
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SN9C102_I2C_100KHZ = 0x01,
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SN9C102_I2C_400KHZ = 0x02,
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};
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enum sn9c102_i2c_interface {
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SN9C102_I2C_2WIRES,
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SN9C102_I2C_3WIRES,
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};
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#define SN9C102_MAX_CTRLS (V4L2_CID_LASTP1-V4L2_CID_BASE+10)
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struct sn9c102_sensor {
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char name[32], /* sensor name */
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maintainer[64]; /* name of the mantainer <email> */
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enum sn9c102_bridge supported_bridge; /* supported SN9C1xx bridges */
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/* Supported operations through the 'sysfs' interface */
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enum sn9c102_i2c_sysfs_ops sysfs_ops;
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/*
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These sensor capabilities must be provided if the SN9C1XX controller
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needs to communicate through the sensor serial interface by using
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at least one of the i2c functions available.
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*/
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enum sn9c102_i2c_frequency frequency;
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enum sn9c102_i2c_interface interface;
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/*
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This identifier must be provided if the image sensor implements
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the standard I2C protocol.
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*/
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u8 i2c_slave_id; /* reg. 0x09 */
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/*
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NOTE: Where not noted,most of the functions below are not mandatory.
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Set to null if you do not implement them. If implemented,
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they must return 0 on success, the proper error otherwise.
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*/
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int (*init)(struct sn9c102_device* cam);
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/*
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This function will be called after the sensor has been attached.
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It should be used to initialize the sensor only, but may also
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configure part of the SN9C1XX chip if necessary. You don't need to
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setup picture settings like brightness, contrast, etc.. here, if
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the corrisponding controls are implemented (see below), since
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they are adjusted in the core driver by calling the set_ctrl()
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method after init(), where the arguments are the default values
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specified in the v4l2_queryctrl list of supported controls;
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Same suggestions apply for other settings, _if_ the corresponding
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methods are present; if not, the initialization must configure the
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sensor according to the default configuration structures below.
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*/
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struct v4l2_queryctrl qctrl[SN9C102_MAX_CTRLS];
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/*
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Optional list of default controls, defined as indicated in the
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V4L2 API. Menu type controls are not handled by this interface.
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*/
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int (*get_ctrl)(struct sn9c102_device* cam, struct v4l2_control* ctrl);
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int (*set_ctrl)(struct sn9c102_device* cam,
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const struct v4l2_control* ctrl);
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/*
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You must implement at least the set_ctrl method if you have defined
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the list above. The returned value must follow the V4L2
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specifications for the VIDIOC_G|C_CTRL ioctls. V4L2_CID_H|VCENTER
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are not supported by this driver, so do not implement them. Also,
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you don't have to check whether the passed values are out of bounds,
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given that this is done by the core module.
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*/
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struct v4l2_cropcap cropcap;
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/*
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Think the image sensor as a grid of R,G,B monochromatic pixels
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disposed according to a particular Bayer pattern, which describes
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the complete array of pixels, from (0,0) to (xmax, ymax). We will
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use this coordinate system from now on. It is assumed the sensor
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chip can be programmed to capture/transmit a subsection of that
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array of pixels: we will call this subsection "active window".
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It is not always true that the largest achievable active window can
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cover the whole array of pixels. The V4L2 API defines another
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area called "source rectangle", which, in turn, is a subrectangle of
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the active window. The SN9C1XX chip is always programmed to read the
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source rectangle.
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The bounds of both the active window and the source rectangle are
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specified in the cropcap substructures 'bounds' and 'defrect'.
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By default, the source rectangle should cover the largest possible
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area. Again, it is not always true that the largest source rectangle
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can cover the entire active window, although it is a rare case for
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the hardware we have. The bounds of the source rectangle _must_ be
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multiple of 16 and must use the same coordinate system as indicated
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before; their centers shall align initially.
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If necessary, the sensor chip must be initialized during init() to
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set the bounds of the active sensor window; however, by default, it
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usually covers the largest achievable area (maxwidth x maxheight)
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of pixels, so no particular initialization is needed, if you have
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defined the correct default bounds in the structures.
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See the V4L2 API for further details.
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NOTE: once you have defined the bounds of the active window
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(struct cropcap.bounds) you must not change them.anymore.
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Only 'bounds' and 'defrect' fields are mandatory, other fields
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will be ignored.
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*/
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int (*set_crop)(struct sn9c102_device* cam,
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const struct v4l2_rect* rect);
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/*
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To be called on VIDIOC_C_SETCROP. The core module always calls a
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default routine which configures the appropriate SN9C1XX regs (also
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scaling), but you may need to override/adjust specific stuff.
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'rect' contains width and height values that are multiple of 16: in
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case you override the default function, you always have to program
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the chip to match those values; on error return the corresponding
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error code without rolling back.
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NOTE: in case, you must program the SN9C1XX chip to get rid of
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blank pixels or blank lines at the _start_ of each line or
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frame after each HSYNC or VSYNC, so that the image starts with
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real RGB data (see regs 0x12, 0x13) (having set H_SIZE and,
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V_SIZE you don't have to care about blank pixels or blank
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lines at the end of each line or frame).
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*/
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struct v4l2_pix_format pix_format;
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/*
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What you have to define here are: 1) initial 'width' and 'height' of
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the target rectangle 2) the initial 'pixelformat', which can be
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either V4L2_PIX_FMT_SN9C10X, V4L2_PIX_FMT_JPEG (for ompressed video)
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or V4L2_PIX_FMT_SBGGR8 3) 'priv', which we'll be used to indicate
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the number of bits per pixel for uncompressed video, 8 or 9 (despite
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the current value of 'pixelformat').
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NOTE 1: both 'width' and 'height' _must_ be either 1/1 or 1/2 or 1/4
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of cropcap.defrect.width and cropcap.defrect.height. I
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suggest 1/1.
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NOTE 2: The initial compression quality is defined by the first bit
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of reg 0x17 during the initialization of the image sensor.
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NOTE 3: as said above, you have to program the SN9C1XX chip to get
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rid of any blank pixels, so that the output of the sensor
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matches the RGB bayer sequence (i.e. BGBGBG...GRGRGR).
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*/
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int (*set_pix_format)(struct sn9c102_device* cam,
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const struct v4l2_pix_format* pix);
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/*
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To be called on VIDIOC_S_FMT, when switching from the SBGGR8 to
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SN9C10X pixel format or viceversa. On error return the corresponding
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error code without rolling back.
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*/
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/*
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Do NOT write to the data below, it's READ ONLY. It is used by the
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core module to store successfully updated values of the above
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settings, for rollbacks..etc..in case of errors during atomic I/O
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*/
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struct v4l2_queryctrl _qctrl[SN9C102_MAX_CTRLS];
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struct v4l2_rect _rect;
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};
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/*****************************************************************************/
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/* Private ioctl's for control settings supported by some image sensors */
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#define SN9C102_V4L2_CID_DAC_MAGNITUDE (V4L2_CID_PRIVATE_BASE + 0)
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#define SN9C102_V4L2_CID_GREEN_BALANCE (V4L2_CID_PRIVATE_BASE + 1)
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#define SN9C102_V4L2_CID_RESET_LEVEL (V4L2_CID_PRIVATE_BASE + 2)
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#define SN9C102_V4L2_CID_PIXEL_BIAS_VOLTAGE (V4L2_CID_PRIVATE_BASE + 3)
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#define SN9C102_V4L2_CID_GAMMA (V4L2_CID_PRIVATE_BASE + 4)
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#define SN9C102_V4L2_CID_BAND_FILTER (V4L2_CID_PRIVATE_BASE + 5)
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#define SN9C102_V4L2_CID_BRIGHT_LEVEL (V4L2_CID_PRIVATE_BASE + 6)
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#endif /* _SN9C102_SENSOR_H_ */
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