Hi Laurent,
Thanks for the patch.
I have a few comments below. Just one fairly general question: locking.
Shouldn't you serialise accesses to sensor registers and your data,
possibly by using a mutex?
Laurent Pinchart wrote:
> From: Martin Hostettler <mar...@neutronstar.dyndns.org>
>
> The MT9M032 is a parallel 1.6MP sensor from Micron controlled through I2C.
>
> The driver creates a V4L2 subdevice. It currently supports cropping, gain,
> exposure and v/h flipping controls in monochrome mode with an
> external pixel clock.
>
> Signed-off-by: Martin Hostettler <mar...@neutronstar.dyndns.org>
> [Lots of clean up, fixes and enhancements]
> Signed-off-by: Laurent Pinchart <laurent.pinch...@ideasonboard.com>
> ---
> drivers/media/video/Kconfig | 8 +
> drivers/media/video/Makefile | 1 +
> drivers/media/video/mt9m032.c | 825
> +++++++++++++++++++++++++++++++++++++++++
> include/media/mt9m032.h | 36 ++
> 4 files changed, 870 insertions(+), 0 deletions(-)
> create mode 100644 drivers/media/video/mt9m032.c
> create mode 100644 include/media/mt9m032.h
>
> diff --git a/drivers/media/video/Kconfig b/drivers/media/video/Kconfig
> index 666836d..2611708 100644
> --- a/drivers/media/video/Kconfig
> +++ b/drivers/media/video/Kconfig
> @@ -947,6 +947,14 @@ config SOC_CAMERA_MT9M001
> This driver supports MT9M001 cameras from Micron, monochrome
> and colour models.
>
> +config VIDEO_MT9M032
> + tristate "MT9M032 camera sensor support"
> + depends on I2C && VIDEO_V4L2
> + select VIDEO_APTINA_PLL
> + help
> + This driver supports MT9M032 cameras from Micron, monochrome
> + models only.
> +
> config SOC_CAMERA_MT9M111
> tristate "mt9m111, mt9m112 and mt9m131 support"
> depends on SOC_CAMERA && I2C
> diff --git a/drivers/media/video/Makefile b/drivers/media/video/Makefile
> index d1304e1..8e037e9 100644
> --- a/drivers/media/video/Makefile
> +++ b/drivers/media/video/Makefile
> @@ -82,6 +82,7 @@ obj-$(CONFIG_VIDEO_AS3645A) += as3645a.o
>
> obj-$(CONFIG_SOC_CAMERA_IMX074) += imx074.o
> obj-$(CONFIG_SOC_CAMERA_MT9M001) += mt9m001.o
> +obj-$(CONFIG_VIDEO_MT9M032) += mt9m032.o
I would put this among the other subdev sensor drivers instead.
> obj-$(CONFIG_SOC_CAMERA_MT9M111) += mt9m111.o
> obj-$(CONFIG_SOC_CAMERA_MT9T031) += mt9t031.o
> obj-$(CONFIG_SOC_CAMERA_MT9T112) += mt9t112.o
> diff --git a/drivers/media/video/mt9m032.c b/drivers/media/video/mt9m032.c
> new file mode 100644
> index 0000000..c3d69aa
> --- /dev/null
> +++ b/drivers/media/video/mt9m032.c
> @@ -0,0 +1,825 @@
> +/*
> + * Driver for MT9M032 CMOS Image Sensor from Micron
> + *
> + * Copyright (C) 2010-2011 Lund Engineering
> + * Contact: Gil Lund <gwl...@lundeng.com>
> + * Author: Martin Hostettler <mar...@neutronstar.dyndns.org>
> + *
> + * 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.
> + *
> + * This program is distributed in the hope that it will be useful, but
> + * WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + * General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
> + * 02110-1301 USA
> + */
> +
> +#include <linux/delay.h>
> +#include <linux/i2c.h>
> +#include <linux/init.h>
> +#include <linux/kernel.h>
> +#include <linux/math64.h>
> +#include <linux/module.h>
> +#include <linux/slab.h>
> +#include <linux/v4l2-mediabus.h>
> +
> +#include <media/media-entity.h>
> +#include <media/mt9m032.h>
> +#include <media/v4l2-ctrls.h>
> +#include <media/v4l2-device.h>
> +#include <media/v4l2-subdev.h>
> +
> +#include "aptina-pll.h"
> +
> +/*
> + * width and height include active boundary and black parts
> + *
> + * column 0- 15 active boundry
> + * column 16-1455 image
> + * column 1456-1471 active boundry
> + * column 1472-1599 black
> + *
> + * row 0- 51 black
> + * row 53- 59 active boundry
> + * row 60-1139 image
> + * row 1140-1147 active boundry
> + * row 1148-1151 black
> + */
> +
> +#define MT9M032_PIXEL_ARRAY_WIDTH 1600
> +#define MT9M032_PIXEL_ARRAY_HEIGHT 1152
> +
> +#define MT9M032_CHIP_VERSION 0x00
> +#define MT9M032_CHIP_VERSION_VALUE 0x1402
> +#define MT9M032_ROW_START 0x01
> +#define MT9M032_ROW_START_MIN 0
> +#define MT9M032_ROW_START_MAX 1152
> +#define MT9M032_ROW_START_DEF 60
> +#define MT9M032_COLUMN_START 0x02
> +#define MT9M032_COLUMN_START_MIN 0
> +#define MT9M032_COLUMN_START_MAX 1600
> +#define MT9M032_COLUMN_START_DEF 16
> +#define MT9M032_ROW_SIZE 0x03
> +#define MT9M032_ROW_SIZE_MIN 32
> +#define MT9M032_ROW_SIZE_MAX 1152
> +#define MT9M032_ROW_SIZE_DEF 1080
> +#define MT9M032_COLUMN_SIZE 0x04
> +#define MT9M032_COLUMN_SIZE_MIN 32
> +#define MT9M032_COLUMN_SIZE_MAX 1600
> +#define MT9M032_COLUMN_SIZE_DEF 1440
> +#define MT9M032_HBLANK 0x05
> +#define MT9M032_VBLANK 0x06
> +#define MT9M032_VBLANK_MAX 0x7ff
> +#define MT9M032_SHUTTER_WIDTH_HIGH 0x08
> +#define MT9M032_SHUTTER_WIDTH_LOW 0x09
> +#define MT9M032_SHUTTER_WIDTH_MIN 1
> +#define MT9M032_SHUTTER_WIDTH_MAX 1048575
> +#define MT9M032_SHUTTER_WIDTH_DEF 1943
> +#define MT9M032_PIX_CLK_CTRL 0x0a
> +#define MT9M032_PIX_CLK_CTRL_INV_PIXCLK 0x8000
> +#define MT9M032_RESTART 0x0b
> +#define MT9M032_RESET 0x0d
> +#define MT9M032_PLL_CONFIG1 0x11
> +#define MT9M032_PLL_CONFIG1_OUTDIV_MASK 0x3f
> +#define MT9M032_PLL_CONFIG1_MUL_SHIFT 8
> +#define MT9M032_READ_MODE1 0x1e
> +#define MT9M032_READ_MODE2 0x20
> +#define MT9M032_READ_MODE2_VFLIP_SHIFT 15
> +#define MT9M032_READ_MODE2_HFLIP_SHIFT 14
> +#define MT9M032_READ_MODE2_ROW_BLC 0x40
> +#define MT9M032_GAIN_GREEN1 0x2b
> +#define MT9M032_GAIN_BLUE 0x2c
> +#define MT9M032_GAIN_RED 0x2d
> +#define MT9M032_GAIN_GREEN2 0x2e
> +
> +/* write only */
> +#define MT9M032_GAIN_ALL 0x35
> +#define MT9M032_GAIN_DIGITAL_MASK 0x7f
> +#define MT9M032_GAIN_DIGITAL_SHIFT 8
> +#define MT9M032_GAIN_AMUL_SHIFT 6
> +#define MT9M032_GAIN_ANALOG_MASK 0x3f
> +#define MT9M032_FORMATTER1 0x9e
> +#define MT9M032_FORMATTER2 0x9f
> +#define MT9M032_FORMATTER2_DOUT_EN 0x1000
> +#define MT9M032_FORMATTER2_PIXCLK_EN 0x2000
> +
> +/*
> + * The available MT9M032 datasheet is missing documentation for register 0x10
> + * MT9P031 seems to be close enough, so use constants from that datasheet for
> + * now.
> + * But keep the name MT9P031 to remind us, that this isn't really confirmed
> + * for this sensor.
> + */
> +#define MT9P031_PLL_CONTROL 0x10
> +#define MT9P031_PLL_CONTROL_PWROFF 0x0050
> +#define MT9P031_PLL_CONTROL_PWRON 0x0051
> +#define MT9P031_PLL_CONTROL_USEPLL 0x0052
> +#define MT9P031_PLL_CONFIG2 0x11
> +#define MT9P031_PLL_CONFIG2_P1_DIV_MASK 0x1f
> +
> +struct mt9m032 {
> + struct v4l2_subdev subdev;
> + struct media_pad pad;
> + struct mt9m032_platform_data *pdata;
> +
> + struct v4l2_ctrl_handler ctrls;
> + struct {
> + struct v4l2_ctrl *hflip;
> + struct v4l2_ctrl *vflip;
> + };
> +
> + bool streaming;
> +
> + unsigned int pix_clock;
> +
> + struct v4l2_mbus_framefmt format;
> + struct v4l2_rect crop;
> + struct v4l2_fract frame_interval;
> +};
> +
> +#define to_mt9m032(sd) container_of(sd, struct mt9m032, subdev)
> +#define to_dev(sensor) \
> + (&((struct i2c_client *)v4l2_get_subdevdata(&(sensor)->subdev))->dev)
> +
> +static int mt9m032_read(struct i2c_client *client, u8 reg)
> +{
> + return i2c_smbus_read_word_swapped(client, reg);
> +}
> +
> +static int mt9m032_write(struct i2c_client *client, u8 reg, const u16 data)
> +{
> + return i2c_smbus_write_word_swapped(client, reg, data);
> +}
> +
> +static u32 mt9m032_row_time(struct mt9m032 *sensor, unsigned int width)
> +{
> + unsigned int effective_width;
> + u32 ns;
> +
> + effective_width = width + 716; /* emperical value */
Why empirical value? This should be directly related to image width
(before binning) and horizontal blanking.
> + ns = div_u64(1000000000ULL * effective_width, sensor->pix_clock);
> + dev_dbg(to_dev(sensor), "MT9M032 line time: %u ns\n", ns);
> + return ns;
> +}
> +
> +static int mt9m032_update_timing(struct mt9m032 *sensor,
> + struct v4l2_fract *interval)
> +{
> + struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
> + struct v4l2_rect *crop = &sensor->crop;
> + unsigned int min_vblank;
> + unsigned int vblank;
> + u32 row_time;
> +
> + if (!interval)
> + interval = &sensor->frame_interval;
> +
> + row_time = mt9m032_row_time(sensor, crop->width);
> +
> + vblank = div_u64(1000000000ULL * interval->numerator,
> + (u64)row_time * interval->denominator)
> + - crop->height;
> +
> + if (vblank > MT9M032_VBLANK_MAX) {
> + /* hardware limits to 11 bit values */
> + interval->denominator = 1000;
> + interval->numerator =
> + div_u64((crop->height + MT9M032_VBLANK_MAX) *
> + (u64)row_time * interval->denominator,
> + 1000000000ULL);
> + vblank = div_u64(1000000000ULL * interval->numerator,
> + (u64)row_time * interval->denominator)
> + - crop->height;
> + }
> + /* enforce minimal 1.6ms blanking time. */
> + min_vblank = 1600000 / row_time;
> + vblank = clamp_t(unsigned int, vblank, min_vblank, MT9M032_VBLANK_MAX);
> +
> + return mt9m032_write(client, MT9M032_VBLANK, vblank);
> +}
> +
> +static int mt9m032_update_geom_timing(struct mt9m032 *sensor)
> +{
> + struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
> + int ret;
> +
> + ret = mt9m032_write(client, MT9M032_COLUMN_SIZE,
> + sensor->crop.width - 1);
> + if (!ret)
> + ret = mt9m032_write(client, MT9M032_ROW_SIZE,
> + sensor->crop.height - 1);
> + if (!ret)
> + ret = mt9m032_write(client, MT9M032_COLUMN_START,
> + sensor->crop.left);
> + if (!ret)
> + ret = mt9m032_write(client, MT9M032_ROW_START,
> + sensor->crop.top);
> + if (!ret)
> + ret = mt9m032_update_timing(sensor, NULL);
> + return ret;
> +}
> +
> +static int update_formatter2(struct mt9m032 *sensor, bool streaming)
> +{
> + struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
> + u16 reg_val = MT9M032_FORMATTER2_DOUT_EN
> + | 0x0070; /* parts reserved! */
> + /* possibly for changing to 14-bit mode */
> +
> + if (streaming)
> + reg_val |= MT9M032_FORMATTER2_PIXCLK_EN; /* pixclock enable */
> +
> + return mt9m032_write(client, MT9M032_FORMATTER2, reg_val);
> +}
> +
> +static int mt9m032_setup_pll(struct mt9m032 *sensor)
> +{
> + static const struct aptina_pll_limits limits = {
> + .ext_clock_min = 8000000,
> + .ext_clock_max = 16500000,
> + .int_clock_min = 2000000,
> + .int_clock_max = 24000000,
> + .out_clock_min = 322000000,
> + .out_clock_max = 693000000,
> + .pix_clock_max = 99000000,
> + .n_min = 1,
> + .n_max = 64,
> + .m_min = 16,
> + .m_max = 255,
> + .p1_min = 1,
> + .p1_max = 128,
> + };
> +
> + struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
> + struct mt9m032_platform_data *pdata = sensor->pdata;
> + struct aptina_pll pll;
> + int ret;
> +
> + pll.ext_clock = pdata->ext_clock;
> + pll.pix_clock = pdata->pix_clock;
You could initialise these in the declaration.
> + ret = aptina_pll_calculate(&client->dev, &limits, &pll);
> + if (ret < 0)
> + return ret;
> +
> + sensor->pix_clock = pll.pix_clock;
> +
> + ret = mt9m032_write(client, MT9M032_PLL_CONFIG1,
> + (pll.m << MT9M032_PLL_CONFIG1_MUL_SHIFT)
> + | (pll.p1 - 1));
> + if (!ret)
> + ret = mt9m032_write(client, MT9P031_PLL_CONFIG2, pll.n - 1);
> + if (!ret)
> + ret = mt9m032_write(client, MT9P031_PLL_CONTROL,
> + MT9P031_PLL_CONTROL_PWRON |
> + MT9P031_PLL_CONTROL_USEPLL);
> + if (!ret) /* more reserved, Continuous, Master Mode */
> + ret = mt9m032_write(client, MT9M032_READ_MODE1, 0x8006);
> + if (!ret) /* Set 14-bit mode, select 7 divider */
> + ret = mt9m032_write(client, MT9M032_FORMATTER1, 0x111e);
I hope the datasheet is public. :-)
If there is one in a known URL it wouldn't hurt to refer to it, I think.
> + return ret;
> +}
> +
> +/*
> -----------------------------------------------------------------------------
> + * Subdev pad operations
> + */
> +
> +static int mt9m032_enum_mbus_code(struct v4l2_subdev *subdev,
> + struct v4l2_subdev_fh *fh,
> + struct v4l2_subdev_mbus_code_enum *code)
> +{
> + if (code->index != 0)
> + return -EINVAL;
> +
> + code->code = V4L2_MBUS_FMT_Y8_1X8;
> + return 0;
> +}
> +
> +static int mt9m032_enum_frame_size(struct v4l2_subdev *subdev,
> + struct v4l2_subdev_fh *fh,
> + struct v4l2_subdev_frame_size_enum *fse)
> +{
> + if (fse->index != 0 || fse->code != V4L2_MBUS_FMT_Y8_1X8)
> + return -EINVAL;
> +
> + fse->min_width = MT9M032_COLUMN_SIZE_DEF;
> + fse->max_width = MT9M032_COLUMN_SIZE_DEF;
> + fse->min_height = MT9M032_ROW_SIZE_DEF;
> + fse->max_height = MT9M032_ROW_SIZE_DEF;
> +
> + return 0;
> +}
> +
> +/**
> + * __mt9m032_get_pad_crop() - get crop rect
> + * @sensor: pointer to the sensor struct
> + * @fh: filehandle for getting the try crop rect from
> + * @which: select try or active crop rect
> + *
> + * Returns a pointer the current active or fh relative try crop rect
> + */
> +static struct v4l2_rect *
> +__mt9m032_get_pad_crop(struct mt9m032 *sensor, struct v4l2_subdev_fh *fh,
> + enum v4l2_subdev_format_whence which)
> +{
> + switch (which) {
> + case V4L2_SUBDEV_FORMAT_TRY:
> + return v4l2_subdev_get_try_crop(fh, 0);
> + case V4L2_SUBDEV_FORMAT_ACTIVE:
> + return &sensor->crop;
> + default:
> + return NULL;
BUG()? Just a thought.
> + }
> +}
> +
> +/**
> + * __mt9m032_get_pad_format() - get format
> + * @sensor: pointer to the sensor struct
> + * @fh: filehandle for getting the try format from
> + * @which: select try or active format
> + *
> + * Returns a pointer the current active or fh relative try format
> + */
> +static struct v4l2_mbus_framefmt *
> +__mt9m032_get_pad_format(struct mt9m032 *sensor, struct v4l2_subdev_fh *fh,
> + enum v4l2_subdev_format_whence which)
> +{
> + switch (which) {
> + case V4L2_SUBDEV_FORMAT_TRY:
> + return v4l2_subdev_get_try_format(fh, 0);
> + case V4L2_SUBDEV_FORMAT_ACTIVE:
> + return &sensor->format;
> + default:
> + return NULL;
Here as well?
> + }
> +}
> +
> +static int mt9m032_get_pad_format(struct v4l2_subdev *subdev,
> + struct v4l2_subdev_fh *fh,
> + struct v4l2_subdev_format *fmt)
> +{
> + struct mt9m032 *sensor = to_mt9m032(subdev);
> +
> + fmt->format = *__mt9m032_get_pad_format(sensor, fh, fmt->which);
> + return 0;
> +}
> +
> +static int mt9m032_set_pad_format(struct v4l2_subdev *subdev,
> + struct v4l2_subdev_fh *fh,
> + struct v4l2_subdev_format *fmt)
> +{
> + struct mt9m032 *sensor = to_mt9m032(subdev);
> +
> + if (sensor->streaming && fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE)
> + return -EBUSY;
> +
> + /* Scaling is not supported, the format is thus fixed. */
> + return mt9m032_get_pad_format(subdev, fh, fmt);
> +}
> +
> +static int mt9m032_get_crop(struct v4l2_subdev *subdev,
> + struct v4l2_subdev_fh *fh,
> + struct v4l2_subdev_crop *crop)
> +{
> + struct mt9m032 *sensor = to_mt9m032(subdev);
> +
> + crop->rect = *__mt9m032_get_pad_crop(sensor, fh, crop->which);
> +
> + return 0;
> +}
> +
> +static int mt9m032_set_crop(struct v4l2_subdev *subdev,
> + struct v4l2_subdev_fh *fh,
> + struct v4l2_subdev_crop *crop)
> +{
> + struct mt9m032 *sensor = to_mt9m032(subdev);
> + struct v4l2_mbus_framefmt *format;
> + struct v4l2_rect *__crop;
> + struct v4l2_rect rect;
> +
> + if (sensor->streaming && crop->which == V4L2_SUBDEV_FORMAT_ACTIVE)
> + return -EBUSY;
> +
> + /* Clamp the crop rectangle boundaries and align them to a multiple of 2
> + * pixels to ensure a GRBG Bayer pattern.
> + */
> + rect.left = clamp(ALIGN(crop->rect.left, 2), MT9M032_COLUMN_START_MIN,
> + MT9M032_COLUMN_START_MAX);
> + rect.top = clamp(ALIGN(crop->rect.top, 2), MT9M032_ROW_START_MIN,
> + MT9M032_ROW_START_MAX);
> + rect.width = clamp(ALIGN(crop->rect.width, 2), MT9M032_COLUMN_SIZE_MIN,
> + MT9M032_COLUMN_SIZE_MAX);
> + rect.height = clamp(ALIGN(crop->rect.height, 2), MT9M032_ROW_SIZE_MIN,
> + MT9M032_ROW_SIZE_MAX);
> +
> + rect.width = min(rect.width, MT9M032_PIXEL_ARRAY_WIDTH - rect.left);
> + rect.height = min(rect.height, MT9M032_PIXEL_ARRAY_HEIGHT - rect.top);
> +
> + __crop = __mt9m032_get_pad_crop(sensor, fh, crop->which);
> +
> + if (rect.width != __crop->width || rect.height != __crop->height) {
> + /* Reset the output image size if the crop rectangle size has
> + * been modified.
> + */
> + format = __mt9m032_get_pad_format(sensor, fh, crop->which);
> + format->width = rect.width;
> + format->height = rect.height;
I think you can do this unconditionally.
> + }
> +
> + *__crop = rect;
> + crop->rect = rect;
> +
> + if (crop->which != V4L2_SUBDEV_FORMAT_ACTIVE)
> + return 0;
> +
> + return mt9m032_update_geom_timing(sensor);
> +}
> +
> +static int mt9m032_get_frame_interval(struct v4l2_subdev *subdev,
> + struct v4l2_subdev_frame_interval *fi)
> +{
> + struct mt9m032 *sensor = to_mt9m032(subdev);
> +
> + memset(fi, 0, sizeof(*fi));
> + fi->interval = sensor->frame_interval;
> +
> + return 0;
> +}
> +
v> +static int mt9m032_set_frame_interval(struct v4l2_subdev *subdev,
> + struct v4l2_subdev_frame_interval *fi)
> +{
> + struct mt9m032 *sensor = to_mt9m032(subdev);
> + int ret;
> +
> + if (sensor->streaming)
> + return -EBUSY;
> +
> + memset(fi->reserved, 0, sizeof(fi->reserved));
I'm not quite sure these should be touched.
> + ret = mt9m032_update_timing(sensor, &fi->interval);
> + if (!ret)
> + sensor->frame_interval = fi->interval;
> +
> + return ret;
> +}
> +
> +static int mt9m032_s_stream(struct v4l2_subdev *subdev, int streaming)
> +{
> + struct mt9m032 *sensor = to_mt9m032(subdev);
> + int ret;
> +
> + ret = update_formatter2(sensor, streaming);
> + if (!ret)
> + sensor->streaming = streaming;
> + return ret;
> +}
> +
> +/*
> -----------------------------------------------------------------------------
> + * V4L2 subdev core operations
> + */
> +
> +#ifdef CONFIG_VIDEO_ADV_DEBUG
> +static int mt9m032_g_register(struct v4l2_subdev *sd,
> + struct v4l2_dbg_register *reg)
> +{
> + struct mt9m032 *sensor = to_mt9m032(sd);
> + struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
> + int val;
> +
> + if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
> + return -EINVAL;
> + if (reg->match.addr != client->addr)
> + return -ENODEV;
> +
> + val = mt9m032_read(client, reg->reg);
> + if (val < 0)
> + return -EIO;
> +
> + reg->size = 2;
> + reg->val = val;
> +
> + return 0;
> +}
> +
> +static int mt9m032_s_register(struct v4l2_subdev *sd,
> + struct v4l2_dbg_register *reg)
> +{
> + struct mt9m032 *sensor = to_mt9m032(sd);
> + struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
> +
> + if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
> + return -EINVAL;
> +
> + if (reg->match.addr != client->addr)
> + return -ENODEV;
> +
> + return mt9m032_write(client, reg->reg, reg->val);
> +}
> +#endif
> +
> +/*
> -----------------------------------------------------------------------------
> + * V4L2 subdev control operations
> + */
> +
> +static int update_read_mode2(struct mt9m032 *sensor, bool vflip, bool hflip)
> +{
> + struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
> + int reg_val = (!!vflip) << MT9M032_READ_MODE2_VFLIP_SHIFT
> + | (!!hflip) << MT9M032_READ_MODE2_HFLIP_SHIFT
> + | MT9M032_READ_MODE2_ROW_BLC
> + | 0x0007;
> +
> + return mt9m032_write(client, MT9M032_READ_MODE2, reg_val);
> +}
> +
> +static int mt9m032_set_gain(struct mt9m032 *sensor, s32 val)
> +{
> + struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
> + int digital_gain_val; /* in 1/8th (0..127) */
> + int analog_mul; /* 0 or 1 */
> + int analog_gain_val; /* in 1/16th. (0..63) */
> + u16 reg_val;
> +
> + digital_gain_val = 51; /* from setup example */
> +
> + if (val < 63) {
> + analog_mul = 0;
> + analog_gain_val = val;
> + } else {
> + analog_mul = 1;
> + analog_gain_val = val / 2;
> + }
> +
> + /* a_gain = (1+analog_mul) + (analog_gain_val+1)/16 */
> + /* overall_gain = a_gain * (1 + digital_gain_val / 8) */
> +
> + reg_val = ((digital_gain_val & MT9M032_GAIN_DIGITAL_MASK)
> + << MT9M032_GAIN_DIGITAL_SHIFT)
> + | ((analog_mul & 1) << MT9M032_GAIN_AMUL_SHIFT)
> + | (analog_gain_val & MT9M032_GAIN_ANALOG_MASK);
> +
> + return mt9m032_write(client, MT9M032_GAIN_ALL, reg_val);
> +}
> +
> +static int mt9m032_try_ctrl(struct v4l2_ctrl *ctrl)
> +{
> + if (ctrl->id == V4L2_CID_GAIN && ctrl->val >= 63) {
> + /* round because of multiplier used for values >= 63 */
> + ctrl->val &= ~1;
> + }
> +
> + return 0;
> +}
> +
> +static int mt9m032_set_ctrl(struct v4l2_ctrl *ctrl)
> +{
> + struct mt9m032 *sensor =
> + container_of(ctrl->handler, struct mt9m032, ctrls);
> + struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
> + int ret;
> +
> + switch (ctrl->id) {
> + case V4L2_CID_GAIN:
> + return mt9m032_set_gain(sensor, ctrl->val);
The gain control only touches analogue gain. Shouldn't you use
V4L2_CID_ANALOGUE_GAIN (or something alike) instead?
> + case V4L2_CID_HFLIP:
> + case V4L2_CID_VFLIP:
> + return update_read_mode2(sensor, sensor->vflip->val,
> + sensor->hflip->val);
> +
> + case V4L2_CID_EXPOSURE:
> + ret = mt9m032_write(client, MT9M032_SHUTTER_WIDTH_HIGH,
> + (ctrl->val >> 16) & 0xffff);
> + if (ret < 0)
> + return ret;
> +
> + return mt9m032_write(client, MT9M032_SHUTTER_WIDTH_LOW,
> + ctrl->val & 0xffff);
> +
> + default:
> + return -EINVAL;
> + }
> +}
> +
> +static struct v4l2_ctrl_ops mt9m032_ctrl_ops = {
> + .s_ctrl = mt9m032_set_ctrl,
> + .try_ctrl = mt9m032_try_ctrl,
> +};
> +
> +/*
> -------------------------------------------------------------------------- */
> +
> +static const struct v4l2_subdev_core_ops mt9m032_core_ops = {
> +#ifdef CONFIG_VIDEO_ADV_DEBUG
> + .g_register = mt9m032_g_register,
> + .s_register = mt9m032_s_register,
> +#endif
> +};
> +
> +static const struct v4l2_subdev_video_ops mt9m032_video_ops = {
> + .s_stream = mt9m032_s_stream,
> + .g_frame_interval = mt9m032_get_frame_interval,
> + .s_frame_interval = mt9m032_set_frame_interval,
> +};
> +
> +static const struct v4l2_subdev_pad_ops mt9m032_pad_ops = {
> + .enum_mbus_code = mt9m032_enum_mbus_code,
> + .enum_frame_size = mt9m032_enum_frame_size,
> + .get_fmt = mt9m032_get_pad_format,
> + .set_fmt = mt9m032_set_pad_format,
> + .set_crop = mt9m032_set_crop,
> + .get_crop = mt9m032_get_crop,
> +};
> +
> +static const struct v4l2_subdev_ops mt9m032_ops = {
> + .core = &mt9m032_core_ops,
> + .video = &mt9m032_video_ops,
> + .pad = &mt9m032_pad_ops,
> +};
> +
> +/*
> -----------------------------------------------------------------------------
> + * Driver initialization and probing
> + */
> +
> +static int mt9m032_probe(struct i2c_client *client,
> + const struct i2c_device_id *devid)
> +{
> + struct i2c_adapter *adapter = client->adapter;
> + struct mt9m032 *sensor;
> + int chip_version;
> + int ret;
> +
> + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
> + dev_warn(&client->dev,
> + "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
> + return -EIO;
> + }
> +
> + if (!client->dev.platform_data)
> + return -ENODEV;
> +
> + sensor = kzalloc(sizeof(*sensor), GFP_KERNEL);
> + if (sensor == NULL)
> + return -ENOMEM;
> +
> + sensor->pdata = client->dev.platform_data;
> +
> + v4l2_i2c_subdev_init(&sensor->subdev, client, &mt9m032_ops);
> + sensor->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
> +
> + chip_version = mt9m032_read(client, MT9M032_CHIP_VERSION);
> + if (chip_version != MT9M032_CHIP_VERSION_VALUE) {
> + dev_err(&client->dev, "MT9M032 not detected, wrong version "
> + "0x%04x\n", chip_version);
> + ret = -ENODEV;
> + goto free_sensor;
> + }
> +
> + dev_info(&client->dev, "MT9P031 detected at address 0x%02x\n",
> + client->addr);
> +
> + sensor->frame_interval.numerator = 1;
> + sensor->frame_interval.denominator = 30;
> +
> + sensor->crop.left = 416;
> + sensor->crop.top = 360;
> + sensor->crop.width = 640;
> + sensor->crop.height = 480;
> +
> + sensor->format.width = sensor->crop.width;
> + sensor->format.height = sensor->crop.height;
> + sensor->format.code = V4L2_MBUS_FMT_Y8_1X8;
> + sensor->format.field = V4L2_FIELD_NONE;
> + sensor->format.colorspace = V4L2_COLORSPACE_SRGB;
> +
> + v4l2_ctrl_handler_init(&sensor->ctrls, 4);
> +
> + v4l2_ctrl_new_std(&sensor->ctrls, &mt9m032_ctrl_ops,
> + V4L2_CID_GAIN, 0, 127, 1, 64);
> +
> + sensor->hflip = v4l2_ctrl_new_std(&sensor->ctrls,
> + &mt9m032_ctrl_ops,
> + V4L2_CID_HFLIP, 0, 1, 1, 0);
> + sensor->vflip = v4l2_ctrl_new_std(&sensor->ctrls,
> + &mt9m032_ctrl_ops,
> + V4L2_CID_VFLIP, 0, 1, 1, 0);
> +
> + v4l2_ctrl_new_std(&sensor->ctrls, &mt9m032_ctrl_ops,
> + V4L2_CID_EXPOSURE, MT9M032_SHUTTER_WIDTH_MIN,
> + MT9M032_SHUTTER_WIDTH_MAX, 1,
> + MT9M032_SHUTTER_WIDTH_DEF);
> +
> + if (sensor->ctrls.error) {
> + ret = sensor->ctrls.error;
> + dev_err(&client->dev, "control initialization error %d\n", ret);
> + goto free_ctrl;
> + }
> +
> + v4l2_ctrl_cluster(2, &sensor->hflip);
> +
> + sensor->subdev.ctrl_handler = &sensor->ctrls;
> + sensor->pad.flags = MEDIA_PAD_FL_SOURCE;
> + ret = media_entity_init(&sensor->subdev.entity, 1, &sensor->pad, 0);
> + if (ret < 0)
> + goto free_ctrl;
> +
> + ret = mt9m032_write(client, MT9M032_RESET, 1); /* reset on */
> + if (ret < 0)
> + goto free_ctrl;
> + mt9m032_write(client, MT9M032_RESET, 0); /* reset off */
> + if (ret < 0)
> + goto free_ctrl;
> +
> + ret = mt9m032_setup_pll(sensor);
> + if (ret < 0)
> + goto free_ctrl;
> + usleep_range(10000, 11000);
> +
> + v4l2_ctrl_handler_setup(&sensor->ctrls);
> +
> + /* SIZE */
> + ret = mt9m032_update_geom_timing(sensor);
> + if (ret < 0)
> + goto free_ctrl;
> +
> + ret = mt9m032_write(client, 0x41, 0x0000); /* reserved !!! */
> + if (ret < 0)
> + goto free_ctrl;
> + ret = mt9m032_write(client, 0x42, 0x0003); /* reserved !!! */
> + if (ret < 0)
> + goto free_ctrl;
> + ret = mt9m032_write(client, 0x43, 0x0003); /* reserved !!! */
> + if (ret < 0)
> + goto free_ctrl;
> + ret = mt9m032_write(client, 0x7f, 0x0000); /* reserved !!! */
> + if (ret < 0)
> + goto free_ctrl;
> + if (sensor->pdata->invert_pixclock) {
> + ret = mt9m032_write(client, MT9M032_PIX_CLK_CTRL,
> + MT9M032_PIX_CLK_CTRL_INV_PIXCLK);
> + if (ret < 0)
> + goto free_ctrl;
> + }
> +
> + ret = mt9m032_write(client, MT9M032_RESTART, 1); /* Restart on */
> + if (ret < 0)
> + goto free_ctrl;
> + msleep(100);
> + ret = mt9m032_write(client, MT9M032_RESTART, 0); /* Restart off */
> + if (ret < 0)
> + goto free_ctrl;
> + msleep(100);
> + ret = update_formatter2(sensor, false);
> + if (ret < 0)
> + goto free_ctrl;
> +
> + return ret;
> +
> +free_ctrl:
> + v4l2_ctrl_handler_free(&sensor->ctrls);
> +
> +free_sensor:
> + kfree(sensor);
> + return ret;
> +}
> +
> +static int mt9m032_remove(struct i2c_client *client)
> +{
> + struct v4l2_subdev *subdev = i2c_get_clientdata(client);
> + struct mt9m032 *sensor = to_mt9m032(subdev);
> +
> + v4l2_device_unregister_subdev(&sensor->subdev);
> + v4l2_ctrl_handler_free(&sensor->ctrls);
> + media_entity_cleanup(&sensor->subdev.entity);
> + kfree(sensor);
> + return 0;
> +}
> +
> +static const struct i2c_device_id mt9m032_id_table[] = {
> + { MT9M032_NAME, 0 },
> + { }
> +};
> +
> +MODULE_DEVICE_TABLE(i2c, mt9m032_id_table);
> +
> +static struct i2c_driver mt9m032_i2c_driver = {
> + .driver = {
> + .name = MT9M032_NAME,
> + },
> + .probe = mt9m032_probe,
> + .remove = mt9m032_remove,
> + .id_table = mt9m032_id_table,
> +};
> +
> +module_i2c_driver(mt9m032_i2c_driver);
> +
> +MODULE_AUTHOR("Martin Hostettler <mar...@neutronstar.dyndns.org>");
> +MODULE_DESCRIPTION("MT9M032 camera sensor driver");
> +MODULE_LICENSE("GPL v2");
> diff --git a/include/media/mt9m032.h b/include/media/mt9m032.h
> new file mode 100644
> index 0000000..c3a7811
> --- /dev/null
> +++ b/include/media/mt9m032.h
> @@ -0,0 +1,36 @@
> +/*
> + * Driver for MT9M032 CMOS Image Sensor from Micron
> + *
> + * Copyright (C) 2010-2011 Lund Engineering
> + * Contact: Gil Lund <gwl...@lundeng.com>
> + * Author: Martin Hostettler <mar...@neutronstar.dyndns.org>
> + *
> + * 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.
> + *
> + * This program is distributed in the hope that it will be useful, but
> + * WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + * General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
> + * 02110-1301 USA
> + *
> + */
> +
> +#ifndef MT9M032_H
> +#define MT9M032_H
> +
> +#define MT9M032_NAME "mt9m032"
> +#define MT9M032_I2C_ADDR (0xb8 >> 1)
> +
> +struct mt9m032_platform_data {
> + u32 ext_clock;
> + u32 pix_clock;
> + bool invert_pixclock;
> +
> +};
> +#endif /* MT9M032_H */
Regards,
--
Sakari Ailus
sakari.ai...@iki.fi
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