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linux/drivers/media/video/ov6650.c
Janusz Krzysztofik 2f6e240479 [media] SoC Camera: add driver for OV6650 sensor 
This patch provides a V4L2 SoC Camera driver for OV6650 camera sensor, found
on OMAP1 SoC based Amstrad Delta videophone.

Since I have no experience with camera sensors, and the sensor documentation I
was able to find was not very comprehensive, I left most settings at their
default (reset) values, except for:
- those required for proper mediabus parameters and picture geometry and
  format setup,
- those used by controls.
Resulting picture quality may be far from perfect, but better than nothing.

In order to be able to get / set the sensor frame rate from userspace, I
decided to provide two not yet SoC camera supported operations, g_parm and
s_parm. These can be used after applying patch 4/6 from this series,
"SoC Camera: add support for g_parm / s_parm operations".

Created and tested against linux-2.6.36-rc5 on Amstrad Delta.

Signed-off-by: Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-10-21 07:55:38 -02:00

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/*
* V4L2 SoC Camera driver for OmniVision OV6650 Camera Sensor
*
* Copyright (C) 2010 Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>
*
* Based on OmniVision OV96xx Camera Driver
* Copyright (C) 2009 Marek Vasut <marek.vasut@gmail.com>
*
* Based on ov772x camera driver:
* Copyright (C) 2008 Renesas Solutions Corp.
* Kuninori Morimoto <morimoto.kuninori@renesas.com>
*
* Based on ov7670 and soc_camera_platform driver,
* Copyright 2006-7 Jonathan Corbet <corbet@lwn.net>
* Copyright (C) 2008 Magnus Damm
* Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
*
* Hardware specific bits initialy based on former work by Matt Callow
* drivers/media/video/omap/sensor_ov6650.c
* Copyright (C) 2006 Matt Callow
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <media/soc_camera.h>
#include <media/v4l2-chip-ident.h>
/* Register definitions */
#define REG_GAIN 0x00 /* range 00 - 3F */
#define REG_BLUE 0x01
#define REG_RED 0x02
#define REG_SAT 0x03 /* [7:4] saturation [0:3] reserved */
#define REG_HUE 0x04 /* [7:6] rsrvd [5] hue en [4:0] hue */
#define REG_BRT 0x06
#define REG_PIDH 0x0a
#define REG_PIDL 0x0b
#define REG_AECH 0x10
#define REG_CLKRC 0x11 /* Data Format and Internal Clock */
/* [7:6] Input system clock (MHz)*/
/* 00=8, 01=12, 10=16, 11=24 */
/* [5:0]: Internal Clock Pre-Scaler */
#define REG_COMA 0x12 /* [7] Reset */
#define REG_COMB 0x13
#define REG_COMC 0x14
#define REG_COMD 0x15
#define REG_COML 0x16
#define REG_HSTRT 0x17
#define REG_HSTOP 0x18
#define REG_VSTRT 0x19
#define REG_VSTOP 0x1a
#define REG_PSHFT 0x1b
#define REG_MIDH 0x1c
#define REG_MIDL 0x1d
#define REG_HSYNS 0x1e
#define REG_HSYNE 0x1f
#define REG_COME 0x20
#define REG_YOFF 0x21
#define REG_UOFF 0x22
#define REG_VOFF 0x23
#define REG_AEW 0x24
#define REG_AEB 0x25
#define REG_COMF 0x26
#define REG_COMG 0x27
#define REG_COMH 0x28
#define REG_COMI 0x29
#define REG_FRARL 0x2b
#define REG_COMJ 0x2c
#define REG_COMK 0x2d
#define REG_AVGY 0x2e
#define REG_REF0 0x2f
#define REG_REF1 0x30
#define REG_REF2 0x31
#define REG_FRAJH 0x32
#define REG_FRAJL 0x33
#define REG_FACT 0x34
#define REG_L1AEC 0x35
#define REG_AVGU 0x36
#define REG_AVGV 0x37
#define REG_SPCB 0x60
#define REG_SPCC 0x61
#define REG_GAM1 0x62
#define REG_GAM2 0x63
#define REG_GAM3 0x64
#define REG_SPCD 0x65
#define REG_SPCE 0x68
#define REG_ADCL 0x69
#define REG_RMCO 0x6c
#define REG_GMCO 0x6d
#define REG_BMCO 0x6e
/* Register bits, values, etc. */
#define OV6650_PIDH 0x66 /* high byte of product ID number */
#define OV6650_PIDL 0x50 /* low byte of product ID number */
#define OV6650_MIDH 0x7F /* high byte of mfg ID */
#define OV6650_MIDL 0xA2 /* low byte of mfg ID */
#define DEF_GAIN 0x00
#define DEF_BLUE 0x80
#define DEF_RED 0x80
#define SAT_SHIFT 4
#define SAT_MASK (0xf << SAT_SHIFT)
#define SET_SAT(x) (((x) << SAT_SHIFT) & SAT_MASK)
#define HUE_EN BIT(5)
#define HUE_MASK 0x1f
#define DEF_HUE 0x10
#define SET_HUE(x) (HUE_EN | ((x) & HUE_MASK))
#define DEF_AECH 0x4D
#define CLKRC_6MHz 0x00
#define CLKRC_12MHz 0x40
#define CLKRC_16MHz 0x80
#define CLKRC_24MHz 0xc0
#define CLKRC_DIV_MASK 0x3f
#define GET_CLKRC_DIV(x) (((x) & CLKRC_DIV_MASK) + 1)
#define COMA_RESET BIT(7)
#define COMA_QCIF BIT(5)
#define COMA_RAW_RGB BIT(4)
#define COMA_RGB BIT(3)
#define COMA_BW BIT(2)
#define COMA_WORD_SWAP BIT(1)
#define COMA_BYTE_SWAP BIT(0)
#define DEF_COMA 0x00
#define COMB_FLIP_V BIT(7)
#define COMB_FLIP_H BIT(5)
#define COMB_BAND_FILTER BIT(4)
#define COMB_AWB BIT(2)
#define COMB_AGC BIT(1)
#define COMB_AEC BIT(0)
#define DEF_COMB 0x5f
#define COML_ONE_CHANNEL BIT(7)
#define DEF_HSTRT 0x24
#define DEF_HSTOP 0xd4
#define DEF_VSTRT 0x04
#define DEF_VSTOP 0x94
#define COMF_HREF_LOW BIT(4)
#define COMJ_PCLK_RISING BIT(4)
#define COMJ_VSYNC_HIGH BIT(0)
/* supported resolutions */
#define W_QCIF (DEF_HSTOP - DEF_HSTRT)
#define W_CIF (W_QCIF << 1)
#define H_QCIF (DEF_VSTOP - DEF_VSTRT)
#define H_CIF (H_QCIF << 1)
#define FRAME_RATE_MAX 30
struct ov6650_reg {
u8 reg;
u8 val;
};
struct ov6650 {
struct v4l2_subdev subdev;
int gain;
int blue;
int red;
int saturation;
int hue;
int brightness;
int exposure;
int gamma;
int aec;
bool vflip;
bool hflip;
bool awb;
bool agc;
bool half_scale; /* scale down output by 2 */
struct v4l2_rect rect; /* sensor cropping window */
unsigned long pclk_limit; /* from host */
unsigned long pclk_max; /* from resolution and format */
struct v4l2_fract tpf; /* as requested with s_parm */
enum v4l2_mbus_pixelcode code;
enum v4l2_colorspace colorspace;
};
static enum v4l2_mbus_pixelcode ov6650_codes[] = {
V4L2_MBUS_FMT_YUYV8_2X8,
V4L2_MBUS_FMT_UYVY8_2X8,
V4L2_MBUS_FMT_YVYU8_2X8,
V4L2_MBUS_FMT_VYUY8_2X8,
V4L2_MBUS_FMT_SBGGR8_1X8,
V4L2_MBUS_FMT_GREY8_1X8,
};
static const struct v4l2_queryctrl ov6650_controls[] = {
{
.id = V4L2_CID_AUTOGAIN,
.type = V4L2_CTRL_TYPE_BOOLEAN,
.name = "AGC",
.minimum = 0,
.maximum = 1,
.step = 1,
.default_value = 1,
},
{
.id = V4L2_CID_GAIN,
.type = V4L2_CTRL_TYPE_INTEGER,
.name = "Gain",
.minimum = 0,
.maximum = 0x3f,
.step = 1,
.default_value = DEF_GAIN,
},
{
.id = V4L2_CID_AUTO_WHITE_BALANCE,
.type = V4L2_CTRL_TYPE_BOOLEAN,
.name = "AWB",
.minimum = 0,
.maximum = 1,
.step = 1,
.default_value = 1,
},
{
.id = V4L2_CID_BLUE_BALANCE,
.type = V4L2_CTRL_TYPE_INTEGER,
.name = "Blue",
.minimum = 0,
.maximum = 0xff,
.step = 1,
.default_value = DEF_BLUE,
},
{
.id = V4L2_CID_RED_BALANCE,
.type = V4L2_CTRL_TYPE_INTEGER,
.name = "Red",
.minimum = 0,
.maximum = 0xff,
.step = 1,
.default_value = DEF_RED,
},
{
.id = V4L2_CID_SATURATION,
.type = V4L2_CTRL_TYPE_INTEGER,
.name = "Saturation",
.minimum = 0,
.maximum = 0xf,
.step = 1,
.default_value = 0x8,
},
{
.id = V4L2_CID_HUE,
.type = V4L2_CTRL_TYPE_INTEGER,
.name = "Hue",
.minimum = 0,
.maximum = HUE_MASK,
.step = 1,
.default_value = DEF_HUE,
},
{
.id = V4L2_CID_BRIGHTNESS,
.type = V4L2_CTRL_TYPE_INTEGER,
.name = "Brightness",
.minimum = 0,
.maximum = 0xff,
.step = 1,
.default_value = 0x80,
},
{
.id = V4L2_CID_EXPOSURE_AUTO,
.type = V4L2_CTRL_TYPE_INTEGER,
.name = "AEC",
.minimum = 0,
.maximum = 3,
.step = 1,
.default_value = 0,
},
{
.id = V4L2_CID_EXPOSURE,
.type = V4L2_CTRL_TYPE_INTEGER,
.name = "Exposure",
.minimum = 0,
.maximum = 0xff,
.step = 1,
.default_value = DEF_AECH,
},
{
.id = V4L2_CID_GAMMA,
.type = V4L2_CTRL_TYPE_INTEGER,
.name = "Gamma",
.minimum = 0,
.maximum = 0xff,
.step = 1,
.default_value = 0x12,
},
{
.id = V4L2_CID_VFLIP,
.type = V4L2_CTRL_TYPE_BOOLEAN,
.name = "Flip Vertically",
.minimum = 0,
.maximum = 1,
.step = 1,
.default_value = 0,
},
{
.id = V4L2_CID_HFLIP,
.type = V4L2_CTRL_TYPE_BOOLEAN,
.name = "Flip Horizontally",
.minimum = 0,
.maximum = 1,
.step = 1,
.default_value = 0,
},
};
/* read a register */
static int ov6650_reg_read(struct i2c_client *client, u8 reg, u8 *val)
{
int ret;
u8 data = reg;
struct i2c_msg msg = {
.addr = client->addr,
.flags = 0,
.len = 1,
.buf = &data,
};
ret = i2c_transfer(client->adapter, &msg, 1);
if (ret < 0)
goto err;
msg.flags = I2C_M_RD;
ret = i2c_transfer(client->adapter, &msg, 1);
if (ret < 0)
goto err;
*val = data;
return 0;
err:
dev_err(&client->dev, "Failed reading register 0x%02x!\n", reg);
return ret;
}
/* write a register */
static int ov6650_reg_write(struct i2c_client *client, u8 reg, u8 val)
{
int ret;
unsigned char data[2] = { reg, val };
struct i2c_msg msg = {
.addr = client->addr,
.flags = 0,
.len = 2,
.buf = data,
};
ret = i2c_transfer(client->adapter, &msg, 1);
udelay(100);
if (ret < 0) {
dev_err(&client->dev, "Failed writing register 0x%02x!\n", reg);
return ret;
}
return 0;
}
/* Read a register, alter its bits, write it back */
static int ov6650_reg_rmw(struct i2c_client *client, u8 reg, u8 set, u8 mask)
{
u8 val;
int ret;
ret = ov6650_reg_read(client, reg, &val);
if (ret) {
dev_err(&client->dev,
"[Read]-Modify-Write of register 0x%02x failed!\n",
reg);
return ret;
}
val &= ~mask;
val |= set;
ret = ov6650_reg_write(client, reg, val);
if (ret)
dev_err(&client->dev,
"Read-Modify-[Write] of register 0x%02x failed!\n",
reg);
return ret;
}
static struct ov6650 *to_ov6650(const struct i2c_client *client)
{
return container_of(i2c_get_clientdata(client), struct ov6650, subdev);
}
/* Start/Stop streaming from the device */
static int ov6650_s_stream(struct v4l2_subdev *sd, int enable)
{
return 0;
}
/* Alter bus settings on camera side */
static int ov6650_set_bus_param(struct soc_camera_device *icd,
unsigned long flags)
{
struct soc_camera_link *icl = to_soc_camera_link(icd);
struct i2c_client *client = to_i2c_client(to_soc_camera_control(icd));
int ret;
flags = soc_camera_apply_sensor_flags(icl, flags);
if (flags & SOCAM_PCLK_SAMPLE_RISING)
ret = ov6650_reg_rmw(client, REG_COMJ, COMJ_PCLK_RISING, 0);
else
ret = ov6650_reg_rmw(client, REG_COMJ, 0, COMJ_PCLK_RISING);
if (ret)
return ret;
if (flags & SOCAM_HSYNC_ACTIVE_LOW)
ret = ov6650_reg_rmw(client, REG_COMF, COMF_HREF_LOW, 0);
else
ret = ov6650_reg_rmw(client, REG_COMF, 0, COMF_HREF_LOW);
if (ret)
return ret;
if (flags & SOCAM_VSYNC_ACTIVE_HIGH)
ret = ov6650_reg_rmw(client, REG_COMJ, COMJ_VSYNC_HIGH, 0);
else
ret = ov6650_reg_rmw(client, REG_COMJ, 0, COMJ_VSYNC_HIGH);
return ret;
}
/* Request bus settings on camera side */
static unsigned long ov6650_query_bus_param(struct soc_camera_device *icd)
{
struct soc_camera_link *icl = to_soc_camera_link(icd);
unsigned long flags = SOCAM_MASTER |
SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING |
SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_HSYNC_ACTIVE_LOW |
SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_LOW |
SOCAM_DATA_ACTIVE_HIGH | SOCAM_DATAWIDTH_8;
return soc_camera_apply_sensor_flags(icl, flags);
}
/* Get status of additional camera capabilities */
static int ov6650_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
struct ov6650 *priv = to_ov6650(client);
uint8_t reg;
int ret = 0;
switch (ctrl->id) {
case V4L2_CID_AUTOGAIN:
ctrl->value = priv->agc;
break;
case V4L2_CID_GAIN:
if (priv->agc) {
ret = ov6650_reg_read(client, REG_GAIN, &reg);
ctrl->value = reg;
} else {
ctrl->value = priv->gain;
}
break;
case V4L2_CID_AUTO_WHITE_BALANCE:
ctrl->value = priv->awb;
break;
case V4L2_CID_BLUE_BALANCE:
if (priv->awb) {
ret = ov6650_reg_read(client, REG_BLUE, &reg);
ctrl->value = reg;
} else {
ctrl->value = priv->blue;
}
break;
case V4L2_CID_RED_BALANCE:
if (priv->awb) {
ret = ov6650_reg_read(client, REG_RED, &reg);
ctrl->value = reg;
} else {
ctrl->value = priv->red;
}
break;
case V4L2_CID_SATURATION:
ctrl->value = priv->saturation;
break;
case V4L2_CID_HUE:
ctrl->value = priv->hue;
break;
case V4L2_CID_BRIGHTNESS:
ctrl->value = priv->brightness;
break;
case V4L2_CID_EXPOSURE_AUTO:
ctrl->value = priv->aec;
break;
case V4L2_CID_EXPOSURE:
if (priv->aec) {
ret = ov6650_reg_read(client, REG_AECH, &reg);
ctrl->value = reg;
} else {
ctrl->value = priv->exposure;
}
break;
case V4L2_CID_GAMMA:
ctrl->value = priv->gamma;
break;
case V4L2_CID_VFLIP:
ctrl->value = priv->vflip;
break;
case V4L2_CID_HFLIP:
ctrl->value = priv->hflip;
break;
}
return ret;
}
/* Set status of additional camera capabilities */
static int ov6650_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
struct ov6650 *priv = to_ov6650(client);
int ret = 0;
switch (ctrl->id) {
case V4L2_CID_AUTOGAIN:
ret = ov6650_reg_rmw(client, REG_COMB,
ctrl->value ? COMB_AGC : 0, COMB_AGC);
if (!ret)
priv->agc = ctrl->value;
break;
case V4L2_CID_GAIN:
ret = ov6650_reg_write(client, REG_GAIN, ctrl->value);
if (!ret)
priv->gain = ctrl->value;
break;
case V4L2_CID_AUTO_WHITE_BALANCE:
ret = ov6650_reg_rmw(client, REG_COMB,
ctrl->value ? COMB_AWB : 0, COMB_AWB);
if (!ret)
priv->awb = ctrl->value;
break;
case V4L2_CID_BLUE_BALANCE:
ret = ov6650_reg_write(client, REG_BLUE, ctrl->value);
if (!ret)
priv->blue = ctrl->value;
break;
case V4L2_CID_RED_BALANCE:
ret = ov6650_reg_write(client, REG_RED, ctrl->value);
if (!ret)
priv->red = ctrl->value;
break;
case V4L2_CID_SATURATION:
ret = ov6650_reg_rmw(client, REG_SAT, SET_SAT(ctrl->value),
SAT_MASK);
if (!ret)
priv->saturation = ctrl->value;
break;
case V4L2_CID_HUE:
ret = ov6650_reg_rmw(client, REG_HUE, SET_HUE(ctrl->value),
HUE_MASK);
if (!ret)
priv->hue = ctrl->value;
break;
case V4L2_CID_BRIGHTNESS:
ret = ov6650_reg_write(client, REG_BRT, ctrl->value);
if (!ret)
priv->brightness = ctrl->value;
break;
case V4L2_CID_EXPOSURE_AUTO:
switch (ctrl->value) {
case V4L2_EXPOSURE_AUTO:
ret = ov6650_reg_rmw(client, REG_COMB, COMB_AEC, 0);
break;
default:
ret = ov6650_reg_rmw(client, REG_COMB, 0, COMB_AEC);
break;
}
if (!ret)
priv->aec = ctrl->value;
break;
case V4L2_CID_EXPOSURE:
ret = ov6650_reg_write(client, REG_AECH, ctrl->value);
if (!ret)
priv->exposure = ctrl->value;
break;
case V4L2_CID_GAMMA:
ret = ov6650_reg_write(client, REG_GAM1, ctrl->value);
if (!ret)
priv->gamma = ctrl->value;
break;
case V4L2_CID_VFLIP:
ret = ov6650_reg_rmw(client, REG_COMB,
ctrl->value ? COMB_FLIP_V : 0, COMB_FLIP_V);
if (!ret)
priv->vflip = ctrl->value;
break;
case V4L2_CID_HFLIP:
ret = ov6650_reg_rmw(client, REG_COMB,
ctrl->value ? COMB_FLIP_H : 0, COMB_FLIP_H);
if (!ret)
priv->hflip = ctrl->value;
break;
}
return ret;
}
/* Get chip identification */
static int ov6650_g_chip_ident(struct v4l2_subdev *sd,
struct v4l2_dbg_chip_ident *id)
{
id->ident = V4L2_IDENT_OV6650;
id->revision = 0;
return 0;
}
#ifdef CONFIG_VIDEO_ADV_DEBUG
static int ov6650_get_register(struct v4l2_subdev *sd,
struct v4l2_dbg_register *reg)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
int ret;
u8 val;
if (reg->reg & ~0xff)
return -EINVAL;
reg->size = 1;
ret = ov6650_reg_read(client, reg->reg, &val);
if (!ret)
reg->val = (__u64)val;
return ret;
}
static int ov6650_set_register(struct v4l2_subdev *sd,
struct v4l2_dbg_register *reg)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
if (reg->reg & ~0xff || reg->val & ~0xff)
return -EINVAL;
return ov6650_reg_write(client, reg->reg, reg->val);
}
#endif
static int ov6650_g_crop(struct v4l2_subdev *sd, struct v4l2_crop *a)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
struct ov6650 *priv = to_ov6650(client);
a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
a->c = priv->rect;
return 0;
}
static int ov6650_s_crop(struct v4l2_subdev *sd, struct v4l2_crop *a)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
struct ov6650 *priv = to_ov6650(client);
struct v4l2_rect *rect = &a->c;
int ret;
if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
rect->left = ALIGN(rect->left, 2);
rect->width = ALIGN(rect->width, 2);
rect->top = ALIGN(rect->top, 2);
rect->height = ALIGN(rect->height, 2);
soc_camera_limit_side(&rect->left, &rect->width,
DEF_HSTRT << 1, 2, W_CIF);
soc_camera_limit_side(&rect->top, &rect->height,
DEF_VSTRT << 1, 2, H_CIF);
ret = ov6650_reg_write(client, REG_HSTRT, rect->left >> 1);
if (!ret) {
priv->rect.left = rect->left;
ret = ov6650_reg_write(client, REG_HSTOP,
(rect->left + rect->width) >> 1);
}
if (!ret) {
priv->rect.width = rect->width;
ret = ov6650_reg_write(client, REG_VSTRT, rect->top >> 1);
}
if (!ret) {
priv->rect.top = rect->top;
ret = ov6650_reg_write(client, REG_VSTOP,
(rect->top + rect->height) >> 1);
}
if (!ret)
priv->rect.height = rect->height;
return ret;
}
static int ov6650_cropcap(struct v4l2_subdev *sd, struct v4l2_cropcap *a)
{
if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
a->bounds.left = DEF_HSTRT << 1;
a->bounds.top = DEF_VSTRT << 1;
a->bounds.width = W_CIF;
a->bounds.height = H_CIF;
a->defrect = a->bounds;
a->pixelaspect.numerator = 1;
a->pixelaspect.denominator = 1;
return 0;
}
static int ov6650_g_fmt(struct v4l2_subdev *sd,
struct v4l2_mbus_framefmt *mf)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
struct ov6650 *priv = to_ov6650(client);
mf->width = priv->rect.width >> priv->half_scale;
mf->height = priv->rect.height >> priv->half_scale;
mf->code = priv->code;
mf->colorspace = priv->colorspace;
mf->field = V4L2_FIELD_NONE;
return 0;
}
static bool is_unscaled_ok(int width, int height, struct v4l2_rect *rect)
{
return (width > rect->width >> 1 || height > rect->height >> 1);
}
static u8 to_clkrc(struct v4l2_fract *timeperframe,
unsigned long pclk_limit, unsigned long pclk_max)
{
unsigned long pclk;
if (timeperframe->numerator && timeperframe->denominator)
pclk = pclk_max * timeperframe->denominator /
(FRAME_RATE_MAX * timeperframe->numerator);
else
pclk = pclk_max;
if (pclk_limit && pclk_limit < pclk)
pclk = pclk_limit;
return (pclk_max - 1) / pclk;
}
/* set the format we will capture in */
static int ov6650_s_fmt(struct v4l2_subdev *sd, struct v4l2_mbus_framefmt *mf)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
struct soc_camera_device *icd = client->dev.platform_data;
struct soc_camera_sense *sense = icd->sense;
struct ov6650 *priv = to_ov6650(client);
bool half_scale = !is_unscaled_ok(mf->width, mf->height, &priv->rect);
struct v4l2_crop a = {
.type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
.c = {
.left = priv->rect.left + (priv->rect.width >> 1) -
(mf->width >> (1 - half_scale)),
.top = priv->rect.top + (priv->rect.height >> 1) -
(mf->height >> (1 - half_scale)),
.width = mf->width << half_scale,
.height = mf->height << half_scale,
},
};
enum v4l2_mbus_pixelcode code = mf->code;
unsigned long mclk, pclk;
u8 coma_set = 0, coma_mask = 0, coml_set, coml_mask, clkrc;
int ret;
/* select color matrix configuration for given color encoding */
switch (code) {
case V4L2_MBUS_FMT_GREY8_1X8:
dev_dbg(&client->dev, "pixel format GREY8_1X8\n");
coma_mask |= COMA_RGB | COMA_WORD_SWAP | COMA_BYTE_SWAP;
coma_set |= COMA_BW;
break;
case V4L2_MBUS_FMT_YUYV8_2X8:
dev_dbg(&client->dev, "pixel format YUYV8_2X8_LE\n");
coma_mask |= COMA_RGB | COMA_BW | COMA_BYTE_SWAP;
coma_set |= COMA_WORD_SWAP;
break;
case V4L2_MBUS_FMT_YVYU8_2X8:
dev_dbg(&client->dev, "pixel format YVYU8_2X8_LE (untested)\n");
coma_mask |= COMA_RGB | COMA_BW | COMA_WORD_SWAP |
COMA_BYTE_SWAP;
break;
case V4L2_MBUS_FMT_UYVY8_2X8:
dev_dbg(&client->dev, "pixel format YUYV8_2X8_BE\n");
if (half_scale) {
coma_mask |= COMA_RGB | COMA_BW | COMA_WORD_SWAP;
coma_set |= COMA_BYTE_SWAP;
} else {
coma_mask |= COMA_RGB | COMA_BW;
coma_set |= COMA_BYTE_SWAP | COMA_WORD_SWAP;
}
break;
case V4L2_MBUS_FMT_VYUY8_2X8:
dev_dbg(&client->dev, "pixel format YVYU8_2X8_BE (untested)\n");
if (half_scale) {
coma_mask |= COMA_RGB | COMA_BW;
coma_set |= COMA_BYTE_SWAP | COMA_WORD_SWAP;
} else {
coma_mask |= COMA_RGB | COMA_BW | COMA_WORD_SWAP;
coma_set |= COMA_BYTE_SWAP;
}
break;
case V4L2_MBUS_FMT_SBGGR8_1X8:
dev_dbg(&client->dev, "pixel format SBGGR8_1X8 (untested)\n");
coma_mask |= COMA_BW | COMA_BYTE_SWAP | COMA_WORD_SWAP;
coma_set |= COMA_RAW_RGB | COMA_RGB;
break;
case 0:
break;
default:
dev_err(&client->dev, "Pixel format not handled: 0x%x\n", code);
return -EINVAL;
}
priv->code = code;
if (code == V4L2_MBUS_FMT_GREY8_1X8 ||
code == V4L2_MBUS_FMT_SBGGR8_1X8) {
coml_mask = COML_ONE_CHANNEL;
coml_set = 0;
priv->pclk_max = 4000000;
} else {
coml_mask = 0;
coml_set = COML_ONE_CHANNEL;
priv->pclk_max = 8000000;
}
if (code == V4L2_MBUS_FMT_SBGGR8_1X8)
priv->colorspace = V4L2_COLORSPACE_SRGB;
else if (code != 0)
priv->colorspace = V4L2_COLORSPACE_JPEG;
if (half_scale) {
dev_dbg(&client->dev, "max resolution: QCIF\n");
coma_set |= COMA_QCIF;
priv->pclk_max /= 2;
} else {
dev_dbg(&client->dev, "max resolution: CIF\n");
coma_mask |= COMA_QCIF;
}
priv->half_scale = half_scale;
if (sense) {
if (sense->master_clock == 8000000) {
dev_dbg(&client->dev, "8MHz input clock\n");
clkrc = CLKRC_6MHz;
} else if (sense->master_clock == 12000000) {
dev_dbg(&client->dev, "12MHz input clock\n");
clkrc = CLKRC_12MHz;
} else if (sense->master_clock == 16000000) {
dev_dbg(&client->dev, "16MHz input clock\n");
clkrc = CLKRC_16MHz;
} else if (sense->master_clock == 24000000) {
dev_dbg(&client->dev, "24MHz input clock\n");
clkrc = CLKRC_24MHz;
} else {
dev_err(&client->dev,
"unspported input clock, check platform data\n");
return -EINVAL;
}
mclk = sense->master_clock;
priv->pclk_limit = sense->pixel_clock_max;
} else {
clkrc = CLKRC_24MHz;
mclk = 24000000;
priv->pclk_limit = 0;
dev_dbg(&client->dev, "using default 24MHz input clock\n");
}
clkrc |= to_clkrc(&priv->tpf, priv->pclk_limit, priv->pclk_max);
pclk = priv->pclk_max / GET_CLKRC_DIV(clkrc);
dev_dbg(&client->dev, "pixel clock divider: %ld.%ld\n",
mclk / pclk, 10 * mclk % pclk / pclk);
ret = ov6650_s_crop(sd, &a);
if (!ret)
ret = ov6650_reg_rmw(client, REG_COMA, coma_set, coma_mask);
if (!ret)
ret = ov6650_reg_write(client, REG_CLKRC, clkrc);
if (!ret)
ret = ov6650_reg_rmw(client, REG_COML, coml_set, coml_mask);
if (!ret) {
mf->colorspace = priv->colorspace;
mf->width = priv->rect.width >> half_scale;
mf->height = priv->rect.height >> half_scale;
}
return ret;
}
static int ov6650_try_fmt(struct v4l2_subdev *sd,
struct v4l2_mbus_framefmt *mf)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
struct ov6650 *priv = to_ov6650(client);
if (is_unscaled_ok(mf->width, mf->height, &priv->rect))
v4l_bound_align_image(&mf->width, 2, W_CIF, 1,
&mf->height, 2, H_CIF, 1, 0);
mf->field = V4L2_FIELD_NONE;
switch (mf->code) {
case V4L2_MBUS_FMT_Y10_1X10:
mf->code = V4L2_MBUS_FMT_GREY8_1X8;
case V4L2_MBUS_FMT_GREY8_1X8:
case V4L2_MBUS_FMT_YVYU8_2X8:
case V4L2_MBUS_FMT_YUYV8_2X8:
case V4L2_MBUS_FMT_VYUY8_2X8:
case V4L2_MBUS_FMT_UYVY8_2X8:
mf->colorspace = V4L2_COLORSPACE_JPEG;
break;
default:
mf->code = V4L2_MBUS_FMT_SBGGR8_1X8;
case V4L2_MBUS_FMT_SBGGR8_1X8:
mf->colorspace = V4L2_COLORSPACE_SRGB;
break;
}
return 0;
}
static int ov6650_enum_fmt(struct v4l2_subdev *sd, unsigned int index,
enum v4l2_mbus_pixelcode *code)
{
if (index >= ARRAY_SIZE(ov6650_codes))
return -EINVAL;
*code = ov6650_codes[index];
return 0;
}
static int ov6650_g_parm(struct v4l2_subdev *sd, struct v4l2_streamparm *parms)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
struct ov6650 *priv = to_ov6650(client);
struct v4l2_captureparm *cp = &parms->parm.capture;
if (parms->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
memset(cp, 0, sizeof(*cp));
cp->capability = V4L2_CAP_TIMEPERFRAME;
cp->timeperframe.numerator = GET_CLKRC_DIV(to_clkrc(&priv->tpf,
priv->pclk_limit, priv->pclk_max));
cp->timeperframe.denominator = FRAME_RATE_MAX;
dev_dbg(&client->dev, "Frame interval: %u/%u s\n",
cp->timeperframe.numerator, cp->timeperframe.denominator);
return 0;
}
static int ov6650_s_parm(struct v4l2_subdev *sd, struct v4l2_streamparm *parms)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
struct ov6650 *priv = to_ov6650(client);
struct v4l2_captureparm *cp = &parms->parm.capture;
struct v4l2_fract *tpf = &cp->timeperframe;
int div, ret;
u8 clkrc;
if (parms->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
if (cp->extendedmode != 0)
return -EINVAL;
if (tpf->numerator == 0 || tpf->denominator == 0)
div = 1; /* Reset to full rate */
else
div = (tpf->numerator * FRAME_RATE_MAX) / tpf->denominator;
if (div == 0)
div = 1;
else if (div > GET_CLKRC_DIV(CLKRC_DIV_MASK))
div = GET_CLKRC_DIV(CLKRC_DIV_MASK);
/*
* Keep result to be used as tpf limit
* for subseqent clock divider calculations
*/
priv->tpf.numerator = div;
priv->tpf.denominator = FRAME_RATE_MAX;
clkrc = to_clkrc(&priv->tpf, priv->pclk_limit, priv->pclk_max);
ret = ov6650_reg_rmw(client, REG_CLKRC, clkrc, CLKRC_DIV_MASK);
if (!ret) {
tpf->numerator = GET_CLKRC_DIV(clkrc);
tpf->denominator = FRAME_RATE_MAX;
}
return ret;
}
/* Soft reset the camera. This has nothing to do with the RESET pin! */
static int ov6650_reset(struct i2c_client *client)
{
int ret;
dev_dbg(&client->dev, "reset\n");
ret = ov6650_reg_rmw(client, REG_COMA, COMA_RESET, 0);
if (ret)
dev_err(&client->dev,
"An error occured while entering soft reset!\n");
return ret;
}
/* program default register values */
static int ov6650_prog_dflt(struct i2c_client *client)
{
int ret;
dev_dbg(&client->dev, "initializing\n");
ret = ov6650_reg_write(client, REG_COMA, 0); /* ~COMA_RESET */
if (!ret)
ret = ov6650_reg_rmw(client, REG_COMB, 0, COMB_BAND_FILTER);
return ret;
}
static int ov6650_video_probe(struct soc_camera_device *icd,
struct i2c_client *client)
{
u8 pidh, pidl, midh, midl;
int ret = 0;
/*
* check and show product ID and manufacturer ID
*/
ret = ov6650_reg_read(client, REG_PIDH, &pidh);
if (!ret)
ret = ov6650_reg_read(client, REG_PIDL, &pidl);
if (!ret)
ret = ov6650_reg_read(client, REG_MIDH, &midh);
if (!ret)
ret = ov6650_reg_read(client, REG_MIDL, &midl);
if (ret)
return ret;
if ((pidh != OV6650_PIDH) || (pidl != OV6650_PIDL)) {
dev_err(&client->dev, "Product ID error 0x%02x:0x%02x\n",
pidh, pidl);
return -ENODEV;
}
dev_info(&client->dev,
"ov6650 Product ID 0x%02x:0x%02x Manufacturer ID 0x%02x:0x%02x\n",
pidh, pidl, midh, midl);
ret = ov6650_reset(client);
if (!ret)
ret = ov6650_prog_dflt(client);
return ret;
}
static struct soc_camera_ops ov6650_ops = {
.set_bus_param = ov6650_set_bus_param,
.query_bus_param = ov6650_query_bus_param,
.controls = ov6650_controls,
.num_controls = ARRAY_SIZE(ov6650_controls),
};
static struct v4l2_subdev_core_ops ov6650_core_ops = {
.g_ctrl = ov6650_g_ctrl,
.s_ctrl = ov6650_s_ctrl,
.g_chip_ident = ov6650_g_chip_ident,
#ifdef CONFIG_VIDEO_ADV_DEBUG
.g_register = ov6650_get_register,
.s_register = ov6650_set_register,
#endif
};
static struct v4l2_subdev_video_ops ov6650_video_ops = {
.s_stream = ov6650_s_stream,
.g_mbus_fmt = ov6650_g_fmt,
.s_mbus_fmt = ov6650_s_fmt,
.try_mbus_fmt = ov6650_try_fmt,
.enum_mbus_fmt = ov6650_enum_fmt,
.cropcap = ov6650_cropcap,
.g_crop = ov6650_g_crop,
.s_crop = ov6650_s_crop,
.g_parm = ov6650_g_parm,
.s_parm = ov6650_s_parm,
};
static struct v4l2_subdev_ops ov6650_subdev_ops = {
.core = &ov6650_core_ops,
.video = &ov6650_video_ops,
};
/*
* i2c_driver function
*/
static int ov6650_probe(struct i2c_client *client,
const struct i2c_device_id *did)
{
struct ov6650 *priv;
struct soc_camera_device *icd = client->dev.platform_data;
struct soc_camera_link *icl;
int ret;
if (!icd) {
dev_err(&client->dev, "Missing soc-camera data!\n");
return -EINVAL;
}
icl = to_soc_camera_link(icd);
if (!icl) {
dev_err(&client->dev, "Missing platform_data for driver\n");
return -EINVAL;
}
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv) {
dev_err(&client->dev,
"Failed to allocate memory for private data!\n");
return -ENOMEM;
}
v4l2_i2c_subdev_init(&priv->subdev, client, &ov6650_subdev_ops);
icd->ops = &ov6650_ops;
priv->rect.left = DEF_HSTRT << 1;
priv->rect.top = DEF_VSTRT << 1;
priv->rect.width = W_CIF;
priv->rect.height = H_CIF;
priv->half_scale = false;
priv->code = V4L2_MBUS_FMT_YUYV8_2X8;
priv->colorspace = V4L2_COLORSPACE_JPEG;
ret = ov6650_video_probe(icd, client);
if (ret) {
icd->ops = NULL;
i2c_set_clientdata(client, NULL);
kfree(priv);
}
return ret;
}
static int ov6650_remove(struct i2c_client *client)
{
struct ov6650 *priv = to_ov6650(client);
i2c_set_clientdata(client, NULL);
kfree(priv);
return 0;
}
static const struct i2c_device_id ov6650_id[] = {
{ "ov6650", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, ov6650_id);
static struct i2c_driver ov6650_i2c_driver = {
.driver = {
.name = "ov6650",
},
.probe = ov6650_probe,
.remove = ov6650_remove,
.id_table = ov6650_id,
};
static int __init ov6650_module_init(void)
{
return i2c_add_driver(&ov6650_i2c_driver);
}
static void __exit ov6650_module_exit(void)
{
i2c_del_driver(&ov6650_i2c_driver);
}
module_init(ov6650_module_init);
module_exit(ov6650_module_exit);
MODULE_DESCRIPTION("SoC Camera driver for OmniVision OV6650");
MODULE_AUTHOR("Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>");
MODULE_LICENSE("GPL v2");
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