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SubjectRe: [PATCH v2 1/4] media: i2c: Copy mt9t112 soc_camera sensor driver
Hi Sakari,
thanks for looking into this!

On Thu, Mar 15, 2018 at 01:35:34PM +0200, Sakari Ailus wrote:
> Hi Jacopo,
>
> I wonder if it'd make sense to just make all the changes to the driver and
> then have it reviewed; I'm not sure the old driver can be said to have been
> in a known-good state that'd be useful to compare against. I think you did
> that with another driver as well.
>

Well, I understand this is still debated, and I see your point.
As far as I can tell the driver had been developed to work with SH4
Ecovec boards and there tested.

I'm not sure I fully got you here though. Are you proposing to
squash my next patch that cleans up the driver into this one and
propose it as a completely new driver to be reviewed from scratch?

In the two previous driver I touched in this "remove soc_camera"
journey (ov772x and tw9910) I have followed this same pattern: copy
the soc_camera driver without removing the existing one, and pile on
top my changes/cleanups in another patch. Then port the board code to
use the new sensor driver, and the new CEU driver as well.

Also, how would you like to proceed here? Hans sent a pull request for
the series, should I go with incremental changes on top of this?

> On Mon, Mar 12, 2018 at 02:43:02PM +0100, Jacopo Mondi wrote:
> > Copy the soc_camera based driver in v4l2 sensor driver directory.
> > This commit just copies the original file without modifying it.
> > No modification to KConfig and Makefile as soc_camera framework
> > dependencies need to be removed first in next commit.
> >
> > Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
> > ---
> > drivers/media/i2c/mt9t112.c | 1163 +++++++++++++++++++++++++++++++++++++++++++
> > 1 file changed, 1163 insertions(+)
> > create mode 100644 drivers/media/i2c/mt9t112.c
> >
> > diff --git a/drivers/media/i2c/mt9t112.c b/drivers/media/i2c/mt9t112.c
> > new file mode 100644
> > index 0000000..297d22e
> > --- /dev/null
> > +++ b/drivers/media/i2c/mt9t112.c
> > @@ -0,0 +1,1163 @@
> > +/*
> > + * mt9t112 Camera Driver
> > + *
> > + * Copyright (C) 2009 Renesas Solutions Corp.
> > + * Kuninori Morimoto <morimoto.kuninori@renesas.com>
> > + *
> > + * Based on ov772x driver, mt9m111 driver,
> > + *
> > + * Copyright (C) 2008 Kuninori Morimoto <morimoto.kuninori@renesas.com>
> > + * Copyright (C) 2008, Robert Jarzmik <robert.jarzmik@free.fr>
> > + * Copyright 2006-7 Jonathan Corbet <corbet@lwn.net>
> > + * Copyright (C) 2008 Magnus Damm
> > + * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
> > + *
> > + * 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/delay.h>
> > +#include <linux/i2c.h>
> > +#include <linux/init.h>
> > +#include <linux/module.h>
> > +#include <linux/slab.h>
> > +#include <linux/v4l2-mediabus.h>
> > +#include <linux/videodev2.h>
> > +
> > +#include <media/i2c/mt9t112.h>
> > +#include <media/soc_camera.h>
> > +#include <media/v4l2-clk.h>
> > +#include <media/v4l2-common.h>
> > +#include <media/v4l2-image-sizes.h>
> > +
> > +/* you can check PLL/clock info */
> > +/* #define EXT_CLOCK 24000000 */
> > +
> > +/************************************************************************
> > + macro
> > +************************************************************************/
> > +/*
> > + * frame size
> > + */
> > +#define MAX_WIDTH 2048
> > +#define MAX_HEIGHT 1536
> > +
> > +/*
> > + * macro of read/write
> > + */
> > +#define ECHECKER(ret, x) \
> > + do { \
> > + (ret) = (x); \
> > + if ((ret) < 0) \
> > + return (ret); \
>
> I think the code would be easier to follow without macros like this one.
>

Yes, I agree, but again, not my code and already in mainline, so I
felt uncomfortable chopping away pieces with an axe just because "I didn't
like it". But if we're going for a major review I can be a bit more
aggressive and address your comments.

> > + } while (0)
> > +
> > +#define mt9t112_reg_write(ret, client, a, b) \
> > + ECHECKER(ret, __mt9t112_reg_write(client, a, b))
> > +#define mt9t112_mcu_write(ret, client, a, b) \
> > + ECHECKER(ret, __mt9t112_mcu_write(client, a, b))
> > +
> > +#define mt9t112_reg_mask_set(ret, client, a, b, c) \
> > + ECHECKER(ret, __mt9t112_reg_mask_set(client, a, b, c))
> > +#define mt9t112_mcu_mask_set(ret, client, a, b, c) \
> > + ECHECKER(ret, __mt9t112_mcu_mask_set(client, a, b, c))
> > +
> > +#define mt9t112_reg_read(ret, client, a) \
> > + ECHECKER(ret, __mt9t112_reg_read(client, a))
> > +
> > +/*
> > + * Logical address
> > + */
> > +#define _VAR(id, offset, base) (base | (id & 0x1f) << 10 | (offset & 0x3ff))
> > +#define VAR(id, offset) _VAR(id, offset, 0x0000)
> > +#define VAR8(id, offset) _VAR(id, offset, 0x8000)
> > +
> > +/************************************************************************
> > + struct
> > +************************************************************************/
> > +struct mt9t112_format {
> > + u32 code;
> > + enum v4l2_colorspace colorspace;
> > + u16 fmt;
> > + u16 order;
> > +};
> > +
> > +struct mt9t112_priv {
> > + struct v4l2_subdev subdev;
> > + struct mt9t112_camera_info *info;
> > + struct i2c_client *client;
> > + struct v4l2_rect frame;
> > + struct v4l2_clk *clk;
> > + const struct mt9t112_format *format;
> > + int num_formats;
> > + u32 flags;
> > +/* for flags */
> > +#define INIT_DONE (1 << 0)
> > +#define PCLK_RISING (1 << 1)
> > +};
> > +
> > +/************************************************************************
> > + supported format
> > +************************************************************************/
> > +
> > +static const struct mt9t112_format mt9t112_cfmts[] = {
> > + {
> > + .code = MEDIA_BUS_FMT_UYVY8_2X8,
> > + .colorspace = V4L2_COLORSPACE_SRGB,
> > + .fmt = 1,
> > + .order = 0,
> > + }, {
> > + .code = MEDIA_BUS_FMT_VYUY8_2X8,
> > + .colorspace = V4L2_COLORSPACE_SRGB,
> > + .fmt = 1,
> > + .order = 1,
> > + }, {
> > + .code = MEDIA_BUS_FMT_YUYV8_2X8,
> > + .colorspace = V4L2_COLORSPACE_SRGB,
> > + .fmt = 1,
> > + .order = 2,
> > + }, {
> > + .code = MEDIA_BUS_FMT_YVYU8_2X8,
> > + .colorspace = V4L2_COLORSPACE_SRGB,
> > + .fmt = 1,
> > + .order = 3,
> > + }, {
> > + .code = MEDIA_BUS_FMT_RGB555_2X8_PADHI_LE,
> > + .colorspace = V4L2_COLORSPACE_SRGB,
> > + .fmt = 8,
> > + .order = 2,
> > + }, {
> > + .code = MEDIA_BUS_FMT_RGB565_2X8_LE,
> > + .colorspace = V4L2_COLORSPACE_SRGB,
> > + .fmt = 4,
> > + .order = 2,
> > + },
> > +};
> > +
> > +/************************************************************************
> > + general function
> > +************************************************************************/
> > +static struct mt9t112_priv *to_mt9t112(const struct i2c_client *client)
> > +{
> > + return container_of(i2c_get_clientdata(client),
> > + struct mt9t112_priv,
> > + subdev);
> > +}
> > +
> > +static int __mt9t112_reg_read(const struct i2c_client *client, u16 command)
> > +{
> > + struct i2c_msg msg[2];
> > + u8 buf[2];
> > + int ret;
> > +
> > + command = swab16(command);
> > +
> > + msg[0].addr = client->addr;
> > + msg[0].flags = 0;
> > + msg[0].len = 2;
> > + msg[0].buf = (u8 *)&command;
> > +
> > + msg[1].addr = client->addr;
> > + msg[1].flags = I2C_M_RD;
> > + msg[1].len = 2;
> > + msg[1].buf = buf;
> > +
> > + /*
> > + * if return value of this function is < 0,
> > + * it mean error.
> > + * else, under 16bit is valid data.
> > + */
> > + ret = i2c_transfer(client->adapter, msg, 2);
> > + if (ret < 0)
> > + return ret;
> > +
> > + memcpy(&ret, buf, 2);
> > + return swab16(ret);
> > +}
> > +
> > +static int __mt9t112_reg_write(const struct i2c_client *client,
> > + u16 command, u16 data)
> > +{
> > + struct i2c_msg msg;
> > + u8 buf[4];
> > + int ret;
> > +
> > + command = swab16(command);
> > + data = swab16(data);
>
> Ouch. This presumably works on little endian systems *only*. Same in the
> above functions.

cpu_to_be16() here and everywhere else?

>
> > +
> > + memcpy(buf + 0, &command, 2);
> > + memcpy(buf + 2, &data, 2);
>
> Just use put_unaligned_be16(), that's all you need.
>
> > +
> > + msg.addr = client->addr;
> > + msg.flags = 0;
> > + msg.len = 4;
> > + msg.buf = buf;
> > +
> > + /*
> > + * i2c_transfer return message length,
> > + * but this function should return 0 if correct case
> > + */
> > + ret = i2c_transfer(client->adapter, &msg, 1);
> > + if (ret >= 0)
> > + ret = 0;
> > +
> > + return ret;
> > +}
> > +
> > +static int __mt9t112_reg_mask_set(const struct i2c_client *client,
> > + u16 command,
> > + u16 mask,
> > + u16 set)
> > +{
> > + int val = __mt9t112_reg_read(client, command);
> > + if (val < 0)
> > + return val;
> > +
> > + val &= ~mask;
> > + val |= set & mask;
> > +
> > + return __mt9t112_reg_write(client, command, val);
> > +}
> > +
> > +/* mcu access */
> > +static int __mt9t112_mcu_read(const struct i2c_client *client, u16 command)
> > +{
> > + int ret;
> > +
> > + ret = __mt9t112_reg_write(client, 0x098E, command);
> > + if (ret < 0)
> > + return ret;
> > +
> > + return __mt9t112_reg_read(client, 0x0990);
> > +}
> > +
> > +static int __mt9t112_mcu_write(const struct i2c_client *client,
> > + u16 command, u16 data)
> > +{
> > + int ret;
> > +
> > + ret = __mt9t112_reg_write(client, 0x098E, command);
> > + if (ret < 0)
> > + return ret;
> > +
> > + return __mt9t112_reg_write(client, 0x0990, data);
> > +}
> > +
> > +static int __mt9t112_mcu_mask_set(const struct i2c_client *client,
> > + u16 command,
> > + u16 mask,
> > + u16 set)
> > +{
> > + int val = __mt9t112_mcu_read(client, command);
> > + if (val < 0)
> > + return val;
> > +
> > + val &= ~mask;
> > + val |= set & mask;
> > +
> > + return __mt9t112_mcu_write(client, command, val);
> > +}
> > +
> > +static int mt9t112_reset(const struct i2c_client *client)
> > +{
> > + int ret;
> > +
> > + mt9t112_reg_mask_set(ret, client, 0x001a, 0x0001, 0x0001);
> > + msleep(1);
> > + mt9t112_reg_mask_set(ret, client, 0x001a, 0x0001, 0x0000);
> > +
> > + return ret;
> > +}
> > +
> > +#ifndef EXT_CLOCK
> > +#define CLOCK_INFO(a, b)
> > +#else
> > +#define CLOCK_INFO(a, b) mt9t112_clock_info(a, b)
> > +static int mt9t112_clock_info(const struct i2c_client *client, u32 ext)
> > +{
> > + int m, n, p1, p2, p3, p4, p5, p6, p7;
> > + u32 vco, clk;
> > + char *enable;
> > +
> > + ext /= 1000; /* kbyte order */
> > +
> > + mt9t112_reg_read(n, client, 0x0012);
> > + p1 = n & 0x000f;
> > + n = n >> 4;
> > + p2 = n & 0x000f;
> > + n = n >> 4;
> > + p3 = n & 0x000f;
> > +
> > + mt9t112_reg_read(n, client, 0x002a);
> > + p4 = n & 0x000f;
> > + n = n >> 4;
> > + p5 = n & 0x000f;
> > + n = n >> 4;
> > + p6 = n & 0x000f;
> > +
> > + mt9t112_reg_read(n, client, 0x002c);
> > + p7 = n & 0x000f;
> > +
> > + mt9t112_reg_read(n, client, 0x0010);
> > + m = n & 0x00ff;
> > + n = (n >> 8) & 0x003f;
> > +
> > + enable = ((6000 > ext) || (54000 < ext)) ? "X" : "";
> > + dev_dbg(&client->dev, "EXTCLK : %10u K %s\n", ext, enable);
> > +
> > + vco = 2 * m * ext / (n+1);
> > + enable = ((384000 > vco) || (768000 < vco)) ? "X" : "";
> > + dev_dbg(&client->dev, "VCO : %10u K %s\n", vco, enable);
> > +
> > + clk = vco / (p1+1) / (p2+1);
> > + enable = (96000 < clk) ? "X" : "";
> > + dev_dbg(&client->dev, "PIXCLK : %10u K %s\n", clk, enable);
> > +
> > + clk = vco / (p3+1);
> > + enable = (768000 < clk) ? "X" : "";
> > + dev_dbg(&client->dev, "MIPICLK : %10u K %s\n", clk, enable);
> > +
> > + clk = vco / (p6+1);
> > + enable = (96000 < clk) ? "X" : "";
> > + dev_dbg(&client->dev, "MCU CLK : %10u K %s\n", clk, enable);
> > +
> > + clk = vco / (p5+1);
> > + enable = (54000 < clk) ? "X" : "";
> > + dev_dbg(&client->dev, "SOC CLK : %10u K %s\n", clk, enable);
> > +
> > + clk = vco / (p4+1);
> > + enable = (70000 < clk) ? "X" : "";
> > + dev_dbg(&client->dev, "Sensor CLK : %10u K %s\n", clk, enable);
> > +
> > + clk = vco / (p7+1);
> > + dev_dbg(&client->dev, "External sensor : %10u K\n", clk);
> > +
> > + clk = ext / (n+1);
> > + enable = ((2000 > clk) || (24000 < clk)) ? "X" : "";
> > + dev_dbg(&client->dev, "PFD : %10u K %s\n", clk, enable);
> > +
> > + return 0;
> > +}
> > +#endif
> > +
> > +static void mt9t112_frame_check(u32 *width, u32 *height, u32 *left, u32 *top)
> > +{
> > + soc_camera_limit_side(left, width, 0, 0, MAX_WIDTH);
> > + soc_camera_limit_side(top, height, 0, 0, MAX_HEIGHT);
> > +}
> > +
> > +static int mt9t112_set_a_frame_size(const struct i2c_client *client,
> > + u16 width,
> > + u16 height)
> > +{
> > + int ret;
> > + u16 wstart = (MAX_WIDTH - width) / 2;
> > + u16 hstart = (MAX_HEIGHT - height) / 2;
> > +
> > + /* (Context A) Image Width/Height */
> > + mt9t112_mcu_write(ret, client, VAR(26, 0), width);
> > + mt9t112_mcu_write(ret, client, VAR(26, 2), height);
> > +
> > + /* (Context A) Output Width/Height */
> > + mt9t112_mcu_write(ret, client, VAR(18, 43), 8 + width);
> > + mt9t112_mcu_write(ret, client, VAR(18, 45), 8 + height);
> > +
> > + /* (Context A) Start Row/Column */
> > + mt9t112_mcu_write(ret, client, VAR(18, 2), 4 + hstart);
> > + mt9t112_mcu_write(ret, client, VAR(18, 4), 4 + wstart);
> > +
> > + /* (Context A) End Row/Column */
> > + mt9t112_mcu_write(ret, client, VAR(18, 6), 11 + height + hstart);
> > + mt9t112_mcu_write(ret, client, VAR(18, 8), 11 + width + wstart);
> > +
> > + mt9t112_mcu_write(ret, client, VAR8(1, 0), 0x06);
> > +
> > + return ret;
> > +}
> > +
> > +static int mt9t112_set_pll_dividers(const struct i2c_client *client,
> > + u8 m, u8 n,
> > + u8 p1, u8 p2, u8 p3,
> > + u8 p4, u8 p5, u8 p6,
> > + u8 p7)
> > +{
> > + int ret;
> > + u16 val;
> > +
> > + /* N/M */
> > + val = (n << 8) |
> > + (m << 0);
> > + mt9t112_reg_mask_set(ret, client, 0x0010, 0x3fff, val);
> > +
> > + /* P1/P2/P3 */
> > + val = ((p3 & 0x0F) << 8) |
> > + ((p2 & 0x0F) << 4) |
> > + ((p1 & 0x0F) << 0);
> > + mt9t112_reg_mask_set(ret, client, 0x0012, 0x0fff, val);
> > +
> > + /* P4/P5/P6 */
> > + val = (0x7 << 12) |
> > + ((p6 & 0x0F) << 8) |
> > + ((p5 & 0x0F) << 4) |
> > + ((p4 & 0x0F) << 0);
> > + mt9t112_reg_mask_set(ret, client, 0x002A, 0x7fff, val);
> > +
> > + /* P7 */
> > + val = (0x1 << 12) |
> > + ((p7 & 0x0F) << 0);
> > + mt9t112_reg_mask_set(ret, client, 0x002C, 0x100f, val);
> > +
> > + return ret;
> > +}
> > +
> > +static int mt9t112_init_pll(const struct i2c_client *client)
> > +{
> > + struct mt9t112_priv *priv = to_mt9t112(client);
> > + int data, i, ret;
> > +
> > + mt9t112_reg_mask_set(ret, client, 0x0014, 0x003, 0x0001);
> > +
> > + /* PLL control: BYPASS PLL = 8517 */
> > + mt9t112_reg_write(ret, client, 0x0014, 0x2145);
> > +
> > + /* Replace these registers when new timing parameters are generated */
> > + mt9t112_set_pll_dividers(client,
> > + priv->info->divider.m,
> > + priv->info->divider.n,
> > + priv->info->divider.p1,
> > + priv->info->divider.p2,
> > + priv->info->divider.p3,
> > + priv->info->divider.p4,
> > + priv->info->divider.p5,
> > + priv->info->divider.p6,
> > + priv->info->divider.p7);
> > +
> > + /*
> > + * TEST_BYPASS on
> > + * PLL_ENABLE on
> > + * SEL_LOCK_DET on
> > + * TEST_BYPASS off
> > + */
> > + mt9t112_reg_write(ret, client, 0x0014, 0x2525);
> > + mt9t112_reg_write(ret, client, 0x0014, 0x2527);
> > + mt9t112_reg_write(ret, client, 0x0014, 0x3427);
> > + mt9t112_reg_write(ret, client, 0x0014, 0x3027);
> > +
> > + mdelay(10);
> > +
> > + /*
> > + * PLL_BYPASS off
> > + * Reference clock count
> > + * I2C Master Clock Divider
> > + */
> > + mt9t112_reg_write(ret, client, 0x0014, 0x3046);
> > + mt9t112_reg_write(ret, client, 0x0016, 0x0400); /* JPEG initialization workaround */
> > + mt9t112_reg_write(ret, client, 0x0022, 0x0190);
> > + mt9t112_reg_write(ret, client, 0x3B84, 0x0212);
> > +
> > + /* External sensor clock is PLL bypass */
> > + mt9t112_reg_write(ret, client, 0x002E, 0x0500);
> > +
> > + mt9t112_reg_mask_set(ret, client, 0x0018, 0x0002, 0x0002);
> > + mt9t112_reg_mask_set(ret, client, 0x3B82, 0x0004, 0x0004);
> > +
> > + /* MCU disabled */
> > + mt9t112_reg_mask_set(ret, client, 0x0018, 0x0004, 0x0004);
> > +
> > + /* out of standby */
> > + mt9t112_reg_mask_set(ret, client, 0x0018, 0x0001, 0);
> > +
> > + mdelay(50);
> > +
> > + /*
> > + * Standby Workaround
> > + * Disable Secondary I2C Pads
> > + */
> > + mt9t112_reg_write(ret, client, 0x0614, 0x0001);
> > + mdelay(1);
> > + mt9t112_reg_write(ret, client, 0x0614, 0x0001);
> > + mdelay(1);
> > + mt9t112_reg_write(ret, client, 0x0614, 0x0001);
> > + mdelay(1);
> > + mt9t112_reg_write(ret, client, 0x0614, 0x0001);
> > + mdelay(1);
> > + mt9t112_reg_write(ret, client, 0x0614, 0x0001);
> > + mdelay(1);
> > + mt9t112_reg_write(ret, client, 0x0614, 0x0001);
> > + mdelay(1);
> > +
> > + /* poll to verify out of standby. Must Poll this bit */
> > + for (i = 0; i < 100; i++) {
> > + mt9t112_reg_read(data, client, 0x0018);
> > + if (!(0x4000 & data))
> > + break;
> > +
> > + mdelay(10);
> > + }
> > +
> > + return ret;
> > +}
> > +
> > +static int mt9t112_init_setting(const struct i2c_client *client)
> > +{
> > +
> > + int ret;
> > +
> > + /* Adaptive Output Clock (A) */
> > + mt9t112_mcu_mask_set(ret, client, VAR(26, 160), 0x0040, 0x0000);
> > +
> > + /* Read Mode (A) */
> > + mt9t112_mcu_write(ret, client, VAR(18, 12), 0x0024);
> > +
> > + /* Fine Correction (A) */
> > + mt9t112_mcu_write(ret, client, VAR(18, 15), 0x00CC);
> > +
> > + /* Fine IT Min (A) */
> > + mt9t112_mcu_write(ret, client, VAR(18, 17), 0x01f1);
> > +
> > + /* Fine IT Max Margin (A) */
> > + mt9t112_mcu_write(ret, client, VAR(18, 19), 0x00fF);
> > +
> > + /* Base Frame Lines (A) */
> > + mt9t112_mcu_write(ret, client, VAR(18, 29), 0x032D);
> > +
> > + /* Min Line Length (A) */
> > + mt9t112_mcu_write(ret, client, VAR(18, 31), 0x073a);
> > +
> > + /* Line Length (A) */
> > + mt9t112_mcu_write(ret, client, VAR(18, 37), 0x07d0);
> > +
> > + /* Adaptive Output Clock (B) */
> > + mt9t112_mcu_mask_set(ret, client, VAR(27, 160), 0x0040, 0x0000);
> > +
> > + /* Row Start (B) */
> > + mt9t112_mcu_write(ret, client, VAR(18, 74), 0x004);
> > +
> > + /* Column Start (B) */
> > + mt9t112_mcu_write(ret, client, VAR(18, 76), 0x004);
> > +
> > + /* Row End (B) */
> > + mt9t112_mcu_write(ret, client, VAR(18, 78), 0x60B);
> > +
> > + /* Column End (B) */
> > + mt9t112_mcu_write(ret, client, VAR(18, 80), 0x80B);
> > +
> > + /* Fine Correction (B) */
> > + mt9t112_mcu_write(ret, client, VAR(18, 87), 0x008C);
> > +
> > + /* Fine IT Min (B) */
> > + mt9t112_mcu_write(ret, client, VAR(18, 89), 0x01F1);
> > +
> > + /* Fine IT Max Margin (B) */
> > + mt9t112_mcu_write(ret, client, VAR(18, 91), 0x00FF);
> > +
> > + /* Base Frame Lines (B) */
> > + mt9t112_mcu_write(ret, client, VAR(18, 101), 0x0668);
> > +
> > + /* Min Line Length (B) */
> > + mt9t112_mcu_write(ret, client, VAR(18, 103), 0x0AF0);
> > +
> > + /* Line Length (B) */
> > + mt9t112_mcu_write(ret, client, VAR(18, 109), 0x0AF0);
> > +
> > + /*
> > + * Flicker Dectection registers
> > + * This section should be replaced whenever new Timing file is generated
> > + * All the following registers need to be replaced
> > + * Following registers are generated from Register Wizard but user can
> > + * modify them. For detail see auto flicker detection tuning
> > + */
> > +
> > + /* FD_FDPERIOD_SELECT */
> > + mt9t112_mcu_write(ret, client, VAR8(8, 5), 0x01);
> > +
> > + /* PRI_B_CONFIG_FD_ALGO_RUN */
> > + mt9t112_mcu_write(ret, client, VAR(27, 17), 0x0003);
> > +
> > + /* PRI_A_CONFIG_FD_ALGO_RUN */
> > + mt9t112_mcu_write(ret, client, VAR(26, 17), 0x0003);
> > +
> > + /*
> > + * AFD range detection tuning registers
> > + */
> > +
> > + /* search_f1_50 */
> > + mt9t112_mcu_write(ret, client, VAR8(18, 165), 0x25);
> > +
> > + /* search_f2_50 */
> > + mt9t112_mcu_write(ret, client, VAR8(18, 166), 0x28);
> > +
> > + /* search_f1_60 */
> > + mt9t112_mcu_write(ret, client, VAR8(18, 167), 0x2C);
> > +
> > + /* search_f2_60 */
> > + mt9t112_mcu_write(ret, client, VAR8(18, 168), 0x2F);
> > +
> > + /* period_50Hz (A) */
> > + mt9t112_mcu_write(ret, client, VAR8(18, 68), 0xBA);
> > +
> > + /* secret register by aptina */
> > + /* period_50Hz (A MSB) */
> > + mt9t112_mcu_write(ret, client, VAR8(18, 303), 0x00);
> > +
> > + /* period_60Hz (A) */
> > + mt9t112_mcu_write(ret, client, VAR8(18, 69), 0x9B);
> > +
> > + /* secret register by aptina */
> > + /* period_60Hz (A MSB) */
> > + mt9t112_mcu_write(ret, client, VAR8(18, 301), 0x00);
> > +
> > + /* period_50Hz (B) */
> > + mt9t112_mcu_write(ret, client, VAR8(18, 140), 0x82);
> > +
> > + /* secret register by aptina */
> > + /* period_50Hz (B) MSB */
> > + mt9t112_mcu_write(ret, client, VAR8(18, 304), 0x00);
> > +
> > + /* period_60Hz (B) */
> > + mt9t112_mcu_write(ret, client, VAR8(18, 141), 0x6D);
> > +
> > + /* secret register by aptina */
> > + /* period_60Hz (B) MSB */
> > + mt9t112_mcu_write(ret, client, VAR8(18, 302), 0x00);
> > +
> > + /* FD Mode */
> > + mt9t112_mcu_write(ret, client, VAR8(8, 2), 0x10);
> > +
> > + /* Stat_min */
> > + mt9t112_mcu_write(ret, client, VAR8(8, 9), 0x02);
> > +
> > + /* Stat_max */
> > + mt9t112_mcu_write(ret, client, VAR8(8, 10), 0x03);
> > +
> > + /* Min_amplitude */
> > + mt9t112_mcu_write(ret, client, VAR8(8, 12), 0x0A);
> > +
> > + /* RX FIFO Watermark (A) */
> > + mt9t112_mcu_write(ret, client, VAR(18, 70), 0x0014);
> > +
> > + /* RX FIFO Watermark (B) */
> > + mt9t112_mcu_write(ret, client, VAR(18, 142), 0x0014);
> > +
> > + /* MCLK: 16MHz
> > + * PCLK: 73MHz
> > + * CorePixCLK: 36.5 MHz
> > + */
> > + mt9t112_mcu_write(ret, client, VAR8(18, 0x0044), 133);
> > + mt9t112_mcu_write(ret, client, VAR8(18, 0x0045), 110);
> > + mt9t112_mcu_write(ret, client, VAR8(18, 0x008c), 130);
> > + mt9t112_mcu_write(ret, client, VAR8(18, 0x008d), 108);
> > +
> > + mt9t112_mcu_write(ret, client, VAR8(18, 0x00A5), 27);
> > + mt9t112_mcu_write(ret, client, VAR8(18, 0x00a6), 30);
> > + mt9t112_mcu_write(ret, client, VAR8(18, 0x00a7), 32);
> > + mt9t112_mcu_write(ret, client, VAR8(18, 0x00a8), 35);
> > +
> > + return ret;
> > +}
> > +
> > +static int mt9t112_auto_focus_setting(const struct i2c_client *client)
> > +{
> > + int ret;
> > +
> > + mt9t112_mcu_write(ret, client, VAR(12, 13), 0x000F);
> > + mt9t112_mcu_write(ret, client, VAR(12, 23), 0x0F0F);
> > + mt9t112_mcu_write(ret, client, VAR8(1, 0), 0x06);
> > +
> > + mt9t112_reg_write(ret, client, 0x0614, 0x0000);
> > +
> > + mt9t112_mcu_write(ret, client, VAR8(1, 0), 0x05);
> > + mt9t112_mcu_write(ret, client, VAR8(12, 2), 0x02);
> > + mt9t112_mcu_write(ret, client, VAR(12, 3), 0x0002);
> > + mt9t112_mcu_write(ret, client, VAR(17, 3), 0x8001);
> > + mt9t112_mcu_write(ret, client, VAR(17, 11), 0x0025);
> > + mt9t112_mcu_write(ret, client, VAR(17, 13), 0x0193);
> > + mt9t112_mcu_write(ret, client, VAR8(17, 33), 0x18);
> > + mt9t112_mcu_write(ret, client, VAR8(1, 0), 0x05);
> > +
> > + return ret;
> > +}
> > +
> > +static int mt9t112_auto_focus_trigger(const struct i2c_client *client)
> > +{
> > + int ret;
> > +
> > + mt9t112_mcu_write(ret, client, VAR8(12, 25), 0x01);
> > +
> > + return ret;
> > +}
> > +
> > +static int mt9t112_init_camera(const struct i2c_client *client)
> > +{
> > + int ret;
> > +
> > + ECHECKER(ret, mt9t112_reset(client));
> > +
> > + ECHECKER(ret, mt9t112_init_pll(client));
> > +
> > + ECHECKER(ret, mt9t112_init_setting(client));
> > +
> > + ECHECKER(ret, mt9t112_auto_focus_setting(client));
> > +
> > + mt9t112_reg_mask_set(ret, client, 0x0018, 0x0004, 0);
> > +
> > + /* Analog setting B */
> > + mt9t112_reg_write(ret, client, 0x3084, 0x2409);
> > + mt9t112_reg_write(ret, client, 0x3092, 0x0A49);
> > + mt9t112_reg_write(ret, client, 0x3094, 0x4949);
> > + mt9t112_reg_write(ret, client, 0x3096, 0x4950);
> > +
> > + /*
> > + * Disable adaptive clock
> > + * PRI_A_CONFIG_JPEG_OB_TX_CONTROL_VAR
> > + * PRI_B_CONFIG_JPEG_OB_TX_CONTROL_VAR
> > + */
> > + mt9t112_mcu_write(ret, client, VAR(26, 160), 0x0A2E);
> > + mt9t112_mcu_write(ret, client, VAR(27, 160), 0x0A2E);
> > +
> > + /* Configure STatus in Status_before_length Format and enable header */
> > + /* PRI_B_CONFIG_JPEG_OB_TX_CONTROL_VAR */
> > + mt9t112_mcu_write(ret, client, VAR(27, 144), 0x0CB4);
> > +
> > + /* Enable JPEG in context B */
> > + /* PRI_B_CONFIG_JPEG_OB_TX_CONTROL_VAR */
> > + mt9t112_mcu_write(ret, client, VAR8(27, 142), 0x01);
> > +
> > + /* Disable Dac_TXLO */
> > + mt9t112_reg_write(ret, client, 0x316C, 0x350F);
> > +
> > + /* Set max slew rates */
> > + mt9t112_reg_write(ret, client, 0x1E, 0x777);
> > +
> > + return ret;
> > +}
> > +
> > +/************************************************************************
> > + v4l2_subdev_core_ops
> > +************************************************************************/
> > +
> > +#ifdef CONFIG_VIDEO_ADV_DEBUG
> > +static int mt9t112_g_register(struct v4l2_subdev *sd,
> > + struct v4l2_dbg_register *reg)
> > +{
> > + struct i2c_client *client = v4l2_get_subdevdata(sd);
> > + int ret;
> > +
> > + reg->size = 2;
> > + mt9t112_reg_read(ret, client, reg->reg);
> > +
> > + reg->val = (__u64)ret;
> > +
> > + return 0;
> > +}
> > +
> > +static int mt9t112_s_register(struct v4l2_subdev *sd,
> > + const struct v4l2_dbg_register *reg)
> > +{
> > + struct i2c_client *client = v4l2_get_subdevdata(sd);
> > + int ret;
> > +
> > + mt9t112_reg_write(ret, client, reg->reg, reg->val);
> > +
> > + return ret;
> > +}
> > +#endif
> > +
> > +static int mt9t112_s_power(struct v4l2_subdev *sd, int on)
> > +{
> > + struct i2c_client *client = v4l2_get_subdevdata(sd);
> > + struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client);
> > + struct mt9t112_priv *priv = to_mt9t112(client);
> > +
> > + return soc_camera_set_power(&client->dev, ssdd, priv->clk, on);
> > +}
> > +
> > +static const struct v4l2_subdev_core_ops mt9t112_subdev_core_ops = {
> > +#ifdef CONFIG_VIDEO_ADV_DEBUG
> > + .g_register = mt9t112_g_register,
> > + .s_register = mt9t112_s_register,
> > +#endif
> > + .s_power = mt9t112_s_power,
> > +};
> > +
> > +
> > +/************************************************************************
> > + v4l2_subdev_video_ops
> > +************************************************************************/
> > +static int mt9t112_s_stream(struct v4l2_subdev *sd, int enable)
> > +{
> > + struct i2c_client *client = v4l2_get_subdevdata(sd);
> > + struct mt9t112_priv *priv = to_mt9t112(client);
> > + int ret = 0;
> > +
> > + if (!enable) {
> > + /* FIXME
> > + *
> > + * If user selected large output size,
> > + * and used it long time,
> > + * mt9t112 camera will be very warm.
> > + *
> > + * But current driver can not stop mt9t112 camera.
> > + * So, set small size here to solve this problem.
> > + */
> > + mt9t112_set_a_frame_size(client, VGA_WIDTH, VGA_HEIGHT);
> > + return ret;
> > + }
> > +
> > + if (!(priv->flags & INIT_DONE)) {
> > + u16 param = PCLK_RISING & priv->flags ? 0x0001 : 0x0000;
> > +
> > + ECHECKER(ret, mt9t112_init_camera(client));
>
> Would it be possible to do this in power-on instead?
>

I guess so, yes

> > +
> > + /* Invert PCLK (Data sampled on falling edge of pixclk) */
> > + mt9t112_reg_write(ret, client, 0x3C20, param);
>
> This one as well, it's known at that time.

yes, PCLK polarity comes from platform data (or eventually device
tree)

>
> > +
> > + mdelay(5);
> > +
> > + priv->flags |= INIT_DONE;
> > + }
> > +
> > + mt9t112_mcu_write(ret, client, VAR(26, 7), priv->format->fmt);
> > + mt9t112_mcu_write(ret, client, VAR(26, 9), priv->format->order);
> > + mt9t112_mcu_write(ret, client, VAR8(1, 0), 0x06);
> > +
> > + mt9t112_set_a_frame_size(client,
> > + priv->frame.width,
> > + priv->frame.height);
> > +
> > + ECHECKER(ret, mt9t112_auto_focus_trigger(client));
> > +
> > + dev_dbg(&client->dev, "format : %d\n", priv->format->code);
> > + dev_dbg(&client->dev, "size : %d x %d\n",
> > + priv->frame.width,
> > + priv->frame.height);
> > +
> > + CLOCK_INFO(client, EXT_CLOCK);
> > +
> > + return ret;
> > +}
> > +
> > +static int mt9t112_set_params(struct mt9t112_priv *priv,
> > + const struct v4l2_rect *rect,
> > + u32 code)
> > +{
> > + int i;
> > +
> > + /*
> > + * get color format
> > + */
> > + for (i = 0; i < priv->num_formats; i++)
> > + if (mt9t112_cfmts[i].code == code)
> > + break;
> > +
> > + if (i == priv->num_formats)
> > + return -EINVAL;
> > +
> > + priv->frame = *rect;
> > +
> > + /*
> > + * frame size check
> > + */
> > + mt9t112_frame_check(&priv->frame.width, &priv->frame.height,
> > + &priv->frame.left, &priv->frame.top);
> > +
> > + priv->format = mt9t112_cfmts + i;
> > +
> > + return 0;
> > +}
> > +
> > +static int mt9t112_get_selection(struct v4l2_subdev *sd,
> > + struct v4l2_subdev_pad_config *cfg,
> > + struct v4l2_subdev_selection *sel)
> > +{
> > + struct i2c_client *client = v4l2_get_subdevdata(sd);
> > + struct mt9t112_priv *priv = to_mt9t112(client);
> > +
> > + if (sel->which != V4L2_SUBDEV_FORMAT_ACTIVE)
> > + return -EINVAL;
> > +
> > + switch (sel->target) {
> > + case V4L2_SEL_TGT_CROP_BOUNDS:
> > + sel->r.left = 0;
> > + sel->r.top = 0;
> > + sel->r.width = MAX_WIDTH;
> > + sel->r.height = MAX_HEIGHT;
> > + return 0;
> > + case V4L2_SEL_TGT_CROP_DEFAULT:
> > + sel->r.left = 0;
> > + sel->r.top = 0;
> > + sel->r.width = VGA_WIDTH;
> > + sel->r.height = VGA_HEIGHT;
> > + return 0;
> > + case V4L2_SEL_TGT_CROP:
> > + sel->r = priv->frame;
> > + return 0;
> > + default:
> > + return -EINVAL;
> > + }
> > +}
> > +
> > +static int mt9t112_set_selection(struct v4l2_subdev *sd,
> > + struct v4l2_subdev_pad_config *cfg,
> > + struct v4l2_subdev_selection *sel)
> > +{
> > + struct i2c_client *client = v4l2_get_subdevdata(sd);
> > + struct mt9t112_priv *priv = to_mt9t112(client);
> > + const struct v4l2_rect *rect = &sel->r;
> > +
> > + if (sel->which != V4L2_SUBDEV_FORMAT_ACTIVE ||
> > + sel->target != V4L2_SEL_TGT_CROP)
> > + return -EINVAL;
> > +
> > + return mt9t112_set_params(priv, rect, priv->format->code);
> > +}
> > +
> > +static int mt9t112_get_fmt(struct v4l2_subdev *sd,
> > + struct v4l2_subdev_pad_config *cfg,
> > + struct v4l2_subdev_format *format)
> > +{
> > + struct v4l2_mbus_framefmt *mf = &format->format;
> > + struct i2c_client *client = v4l2_get_subdevdata(sd);
> > + struct mt9t112_priv *priv = to_mt9t112(client);
> > +
> > + if (format->pad)
> > + return -EINVAL;
>
> If there's just one pad, the check is redundant. (It's already present in
> the subdev IOCTL handling.)
>
> > +
> > + mf->width = priv->frame.width;
> > + mf->height = priv->frame.height;
> > + mf->colorspace = priv->format->colorspace;
> > + mf->code = priv->format->code;
> > + mf->field = V4L2_FIELD_NONE;
> > +
> > + return 0;
> > +}
> > +
> > +static int mt9t112_s_fmt(struct v4l2_subdev *sd,
> > + struct v4l2_mbus_framefmt *mf)
> > +{
> > + struct i2c_client *client = v4l2_get_subdevdata(sd);
> > + struct mt9t112_priv *priv = to_mt9t112(client);
> > + struct v4l2_rect rect = {
> > + .width = mf->width,
> > + .height = mf->height,
> > + .left = priv->frame.left,
> > + .top = priv->frame.top,
> > + };
> > + int ret;
> > +
> > + ret = mt9t112_set_params(priv, &rect, mf->code);
> > +
> > + if (!ret)
> > + mf->colorspace = priv->format->colorspace;
> > +
> > + return ret;
> > +}
> > +
> > +static int mt9t112_set_fmt(struct v4l2_subdev *sd,
> > + struct v4l2_subdev_pad_config *cfg,
> > + struct v4l2_subdev_format *format)
> > +{
> > + struct v4l2_mbus_framefmt *mf = &format->format;
> > + struct i2c_client *client = v4l2_get_subdevdata(sd);
> > + struct mt9t112_priv *priv = to_mt9t112(client);
> > + unsigned int top, left;
> > + int i;
> > +
> > + if (format->pad)
> > + return -EINVAL;
> > +
> > + for (i = 0; i < priv->num_formats; i++)
> > + if (mt9t112_cfmts[i].code == mf->code)
> > + break;
> > +
> > + if (i == priv->num_formats) {
> > + mf->code = MEDIA_BUS_FMT_UYVY8_2X8;
> > + mf->colorspace = V4L2_COLORSPACE_JPEG;
> > + } else {
> > + mf->colorspace = mt9t112_cfmts[i].colorspace;
> > + }
> > +
> > + mt9t112_frame_check(&mf->width, &mf->height, &left, &top);
> > +
> > + mf->field = V4L2_FIELD_NONE;
> > +
> > + if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE)
> > + return mt9t112_s_fmt(sd, mf);
> > + cfg->try_fmt = *mf;
> > + return 0;
> > +}
> > +
> > +static int mt9t112_enum_mbus_code(struct v4l2_subdev *sd,
> > + struct v4l2_subdev_pad_config *cfg,
> > + struct v4l2_subdev_mbus_code_enum *code)
> > +{
> > + struct i2c_client *client = v4l2_get_subdevdata(sd);
> > + struct mt9t112_priv *priv = to_mt9t112(client);
> > +
> > + if (code->pad || code->index >= priv->num_formats)
> > + return -EINVAL;
> > +
> > + code->code = mt9t112_cfmts[code->index].code;
> > +
> > + return 0;
> > +}
> > +
> > +static int mt9t112_g_mbus_config(struct v4l2_subdev *sd,
> > + struct v4l2_mbus_config *cfg)
> > +{
> > + struct i2c_client *client = v4l2_get_subdevdata(sd);
> > + struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client);
> > +
> > + cfg->flags = V4L2_MBUS_MASTER | V4L2_MBUS_VSYNC_ACTIVE_HIGH |
> > + V4L2_MBUS_HSYNC_ACTIVE_HIGH | V4L2_MBUS_DATA_ACTIVE_HIGH |
> > + V4L2_MBUS_PCLK_SAMPLE_RISING | V4L2_MBUS_PCLK_SAMPLE_FALLING;
> > + cfg->type = V4L2_MBUS_PARALLEL;
> > + cfg->flags = soc_camera_apply_board_flags(ssdd, cfg);
> > +
> > + return 0;
> > +}
> > +
> > +static int mt9t112_s_mbus_config(struct v4l2_subdev *sd,
> > + const struct v4l2_mbus_config *cfg)
> > +{
> > + struct i2c_client *client = v4l2_get_subdevdata(sd);
> > + struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client);
> > + struct mt9t112_priv *priv = to_mt9t112(client);
> > +
> > + if (soc_camera_apply_board_flags(ssdd, cfg) & V4L2_MBUS_PCLK_SAMPLE_RISING)
> > + priv->flags |= PCLK_RISING;
> > +
> > + return 0;
> > +}
>
> Do you have a DT based system where you use this? Then I think it'd be
> rather easy to get rid of the mbus config stuff.
>

Please see my next patch where I get rid of s/g_mbus_config (and it
does not depend on DT support, which, as you can see, it's not here at
all)

> > +
> > +static const struct v4l2_subdev_video_ops mt9t112_subdev_video_ops = {
> > + .s_stream = mt9t112_s_stream,
> > + .g_mbus_config = mt9t112_g_mbus_config,
> > + .s_mbus_config = mt9t112_s_mbus_config,
> > +};
> > +
> > +static const struct v4l2_subdev_pad_ops mt9t112_subdev_pad_ops = {
> > + .enum_mbus_code = mt9t112_enum_mbus_code,
> > + .get_selection = mt9t112_get_selection,
> > + .set_selection = mt9t112_set_selection,
> > + .get_fmt = mt9t112_get_fmt,
> > + .set_fmt = mt9t112_set_fmt,
> > +};
> > +
> > +/************************************************************************
> > + i2c driver
> > +************************************************************************/
> > +static const struct v4l2_subdev_ops mt9t112_subdev_ops = {
> > + .core = &mt9t112_subdev_core_ops,
> > + .video = &mt9t112_subdev_video_ops,
> > + .pad = &mt9t112_subdev_pad_ops,
> > +};
> > +
> > +static int mt9t112_camera_probe(struct i2c_client *client)
> > +{
> > + struct mt9t112_priv *priv = to_mt9t112(client);
> > + const char *devname;
> > + int chipid;
> > + int ret;
> > +
> > + ret = mt9t112_s_power(&priv->subdev, 1);
> > + if (ret < 0)
> > + return ret;
> > +
> > + /*
> > + * check and show chip ID
> > + */
> > + mt9t112_reg_read(chipid, client, 0x0000);
> > +
> > + switch (chipid) {
> > + case 0x2680:
> > + devname = "mt9t111";
> > + priv->num_formats = 1;
> > + break;
> > + case 0x2682:
> > + devname = "mt9t112";
> > + priv->num_formats = ARRAY_SIZE(mt9t112_cfmts);
> > + break;
> > + default:
> > + dev_err(&client->dev, "Product ID error %04x\n", chipid);
> > + ret = -ENODEV;
> > + goto done;
> > + }
> > +
> > + dev_info(&client->dev, "%s chip ID %04x\n", devname, chipid);
> > +
> > +done:
> > + mt9t112_s_power(&priv->subdev, 0);
> > + return ret;
> > +}
> > +
> > +static int mt9t112_probe(struct i2c_client *client,
> > + const struct i2c_device_id *did)
> > +{
> > + struct mt9t112_priv *priv;
> > + struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client);
> > + struct v4l2_rect rect = {
> > + .width = VGA_WIDTH,
> > + .height = VGA_HEIGHT,
> > + .left = (MAX_WIDTH - VGA_WIDTH) / 2,
> > + .top = (MAX_HEIGHT - VGA_HEIGHT) / 2,
> > + };
> > + int ret;
> > +
> > + if (!ssdd || !ssdd->drv_priv) {
> > + dev_err(&client->dev, "mt9t112: missing platform data!\n");
> > + return -EINVAL;
> > + }
> > +
> > + priv = devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL);
> > + if (!priv)
> > + return -ENOMEM;
> > +
> > + priv->info = ssdd->drv_priv;
> > +
> > + v4l2_i2c_subdev_init(&priv->subdev, client, &mt9t112_subdev_ops);
> > +
> > + priv->clk = v4l2_clk_get(&client->dev, "mclk");
> > + if (IS_ERR(priv->clk))
> > + return PTR_ERR(priv->clk);
> > +
> > + ret = mt9t112_camera_probe(client);
> > +
> > + /* Cannot fail: using the default supported pixel code */
> > + if (!ret)
> > + mt9t112_set_params(priv, &rect, MEDIA_BUS_FMT_UYVY8_2X8);
> > + else
> > + v4l2_clk_put(priv->clk);
> > +
> > + return ret;
> > +}
> > +
> > +static int mt9t112_remove(struct i2c_client *client)
> > +{
> > + struct mt9t112_priv *priv = to_mt9t112(client);
> > +
> > + v4l2_clk_put(priv->clk);
> > + return 0;
> > +}
> > +
> > +static const struct i2c_device_id mt9t112_id[] = {
> > + { "mt9t112", 0 },
> > + { }
> > +};
> > +MODULE_DEVICE_TABLE(i2c, mt9t112_id);
> > +
> > +static struct i2c_driver mt9t112_i2c_driver = {
> > + .driver = {
> > + .name = "mt9t112",
> > + },
> > + .probe = mt9t112_probe,
>
> If you need to support OF based systems only, you could use probe_new and
> drop the i2c ID table.

Actually I currently need to support non-OF system only, as this
driver was only used by SH4 Ecovec.

As you know, I hope to be able to test this driver sooner or later on
an OF capable platform and add DT support to it, but for now,
we're stuck with board files support only.

Thanks
j


>
> > + .remove = mt9t112_remove,
> > + .id_table = mt9t112_id,
> > +};
> > +
> > +module_i2c_driver(mt9t112_i2c_driver);
> > +
> > +MODULE_DESCRIPTION("SoC Camera driver for mt9t112");
> > +MODULE_AUTHOR("Kuninori Morimoto");
> > +MODULE_LICENSE("GPL v2");
>
> --
> Kind regards,
>
> Sakari Ailus
> e-mail: sakari.ailus@iki.fi
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