[PATCH v3 01/10] v4l: Add driver for Micron MT9M032 camera sensor

Laurent Pinchart
2012-03-03T15:28:00Z

From: Martin Hostettler <martin@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 <martin@neutronstar.dyndns.org>
---
drivers/media/video/Kconfig | 7 +
drivers/media/video/Makefile | 1 +
drivers/media/video/mt9m032.c | 832 +++++++++++++++++++++++++++++++++++++++++
include/media/mt9m032.h | 38 ++
4 files changed, 878 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 9495b6a..80acb78 100644
--- a/drivers/media/video/Kconfig
+++ b/drivers/media/video/Kconfig
@@ -943,6 +943,13 @@ 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
+ 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 563443c..9b19533 100644
--- a/drivers/media/video/Makefile
+++ b/drivers/media/video/Makefile
@@ -78,6 +78,7 @@ obj-$(CONFIG_VIDEO_AS3645A) += as3645a.o

obj-$(CONFIG_SOC_CAMERA_IMX074) += imx074.o
obj-$(CONFIG_SOC_CAMERA_MT9M001) += mt9m001.o
+obj-$(CONFIG_VIDEO_MT9M032) += mt9m032.o
obj-$(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..92495f7
--- /dev/null
+++ b/drivers/media/video/mt9m032.c
@@ -0,0 +1,832 @@
+/*
+ * Driver for MT9M032 CMOS Image Sensor from Micron
+ *
+ * Copyright (C) 2010-2011 Lund Engineering
+ * Contact: Gil Lund <gwlund@lundeng.com>
+ * Author: Martin Hostettler <martin@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/v4l2-ctrls.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-subdev.h>
+
+#include <media/mt9m032.h>
+
+#define MT9M032_CHIP_VERSION 0x00
+#define MT9M032_CHIP_VERSION_VALUE 0x1402
+#define MT9M032_ROW_START 0x01
+#define MT9M032_COLUMN_START 0x02
+#define MT9M032_ROW_SIZE 0x03
+#define MT9M032_COLUMN_SIZE 0x04
+#define MT9M032_HBLANK 0x05
+#define MT9M032_VBLANK 0x06
+#define MT9M032_SHUTTER_WIDTH_HIGH 0x08
+#define MT9M032_SHUTTER_WIDTH_LOW 0x09
+#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
+
+#define MT9M032_MAX_BLANKING_ROWS 0x7ff
+
+
+/*
+ * The availible 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
+
+
+
+/*
+ * width and height include active boundry 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_WIDTH 1600
+#define MT9M032_HEIGHT 1152
+#define MT9M032_MINIMALSIZE 32
+
+#define to_mt9m032(sd) container_of(sd, struct mt9m032, subdev)
+#define to_dev(sensor) &((struct i2c_client *)v4l2_get_subdevdata(&sensor->subdev))->dev
+
+struct mt9m032 {
+ struct v4l2_subdev subdev;
+ struct media_pad pad;
+ struct mt9m032_platform_data *pdata;
+ struct v4l2_ctrl_handler ctrls;
+
+ bool streaming;
+
+ int pix_clock;
+
+ struct v4l2_mbus_framefmt format; /* height and width always the same as in crop */
+ struct v4l2_rect crop;
+ struct v4l2_fract frame_interval;
+
+ struct v4l2_ctrl *hflip, *vflip;
+};
+
+
+static int mt9m032_read_reg(struct mt9m032 *sensor, u8 reg)
+{
+ struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
+
+ return i2c_smbus_read_word_swapped(client, reg);
+}
+
+static int mt9m032_write_reg(struct mt9m032 *sensor, u8 reg,
+ const u16 data)
+{
+ struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
+
+ return i2c_smbus_write_word_swapped(client, reg, data);
+}
+
+
+static unsigned long mt9m032_row_time(struct mt9m032 *sensor, int width)
+{
+ int effective_width;
+ u64 ns;
+
+ effective_width = width + 716; /* emperical value */
+ ns = div_u64(((u64)1000000000) * effective_width, sensor->pix_clock);
+ dev_dbg(to_dev(sensor), "MT9M032 line time: %llu ns\n", ns);
+ return ns;
+}
+
+static int mt9m032_update_timing(struct mt9m032 *sensor,
+ struct v4l2_fract *interval,
+ const struct v4l2_rect *crop)
+{
+ unsigned long row_time;
+ int additional_blanking_rows;
+ int min_blank;
+
+ if (!interval)
+ interval = &sensor->frame_interval;
+ if (!crop)
+ crop = &sensor->crop;
+
+ row_time = mt9m032_row_time(sensor, crop->width);
+
+ additional_blanking_rows = div_u64(((u64)1000000000) * interval->numerator,
+ ((u64)interval->denominator) * row_time)
+ - crop->height;
+
+ if (additional_blanking_rows > MT9M032_MAX_BLANKING_ROWS) {
+ /* hardware limits to 11 bit values */
+ interval->denominator = 1000;
+ interval->numerator = div_u64((crop->height + MT9M032_MAX_BLANKING_ROWS)
+ * ((u64)row_time) * interval->denominator,
+ 1000000000);
+ additional_blanking_rows = div_u64(((u64)1000000000) * interval->numerator,
+ ((u64)interval->denominator) * row_time)
+ - crop->height;
+ }
+ /* enforce minimal 1.6ms blanking time. */
+ min_blank = 1600000 / row_time;
+ additional_blanking_rows = clamp(additional_blanking_rows,
+ min_blank, MT9M032_MAX_BLANKING_ROWS);
+
+ return mt9m032_write_reg(sensor, MT9M032_VBLANK, additional_blanking_rows);
+}
+
+static int mt9m032_update_geom_timing(struct mt9m032 *sensor,
+ const struct v4l2_rect *crop)
+{
+ int ret;
+
+ ret = mt9m032_write_reg(sensor, MT9M032_COLUMN_SIZE, crop->width - 1);
+ if (!ret)
+ ret = mt9m032_write_reg(sensor, MT9M032_ROW_SIZE, crop->height - 1);
+ /* offsets compensate for black border */
+ if (!ret)
+ ret = mt9m032_write_reg(sensor, MT9M032_COLUMN_START, crop->left);
+ if (!ret)
+ ret = mt9m032_write_reg(sensor, MT9M032_ROW_START, crop->top);
+ if (!ret)
+ ret = mt9m032_update_timing(sensor, NULL, crop);
+ return ret;
+}
+
+static int update_formatter2(struct mt9m032 *sensor, bool streaming)
+{
+ 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_reg(sensor, MT9M032_FORMATTER2, reg_val);
+}
+
+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;
+}
+
+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 || code->pad != 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 || fse->pad != 0)
+ return -EINVAL;
+
+ fse->min_width = MT9M032_WIDTH;
+ fse->max_width = MT9M032_WIDTH;
+ fse->min_height = MT9M032_HEIGHT;
+ fse->max_height = MT9M032_HEIGHT;
+
+ 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,
+ u32 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;
+ }
+}
+
+/**
+ * __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,
+ u32 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;
+ }
+}
+
+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);
+ struct v4l2_mbus_framefmt *format;
+
+ format = __mt9m032_get_pad_format(sensor, fh, fmt->which);
+
+ fmt->format = *format;
+
+ 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)
+ return -EBUSY;
+
+ /*
+ * fmt->format.colorspace, fmt->format.code and fmt->format.field are ignored
+ * and thus forced to fixed values by the get call below.
+ *
+ * fmt->format.width, fmt->format.height are forced to the values set via crop
+ */
+
+ 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);
+ struct v4l2_rect *curcrop;
+
+ curcrop = __mt9m032_get_pad_crop(sensor, fh, crop->which);
+
+ crop->rect = *curcrop;
+
+ 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 tmp_format;
+ struct v4l2_rect tmp_crop_rect;
+ struct v4l2_mbus_framefmt *format;
+ struct v4l2_rect *crop_rect;
+ int ret = 0;
+
+ if (sensor->streaming)
+ return -EBUSY;
+
+ format = __mt9m032_get_pad_format(sensor, fh, crop->which);
+ crop_rect = __mt9m032_get_pad_crop(sensor, fh, crop->which);
+ if (crop->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
+ tmp_crop_rect = *crop_rect;
+ tmp_format = *format;
+ format = &tmp_format;
+ crop_rect = &tmp_crop_rect;
+ }
+
+ crop_rect->top = clamp(crop->rect.top, 0,
+ MT9M032_HEIGHT - MT9M032_MINIMALSIZE) & ~1;
+ crop_rect->left = clamp(crop->rect.left, 0,
+ MT9M032_WIDTH - MT9M032_MINIMALSIZE);
+ crop_rect->height = clamp(crop->rect.height, MT9M032_MINIMALSIZE,
+ MT9M032_HEIGHT - crop_rect->top);
+ crop_rect->width = clamp(crop->rect.width, MT9M032_MINIMALSIZE,
+ MT9M032_WIDTH - crop_rect->left) & ~1;
+
+ format->height = crop_rect->height;
+ format->width = crop_rect->width;
+
+ if (crop->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
+ ret = mt9m032_update_geom_timing(sensor, crop_rect);
+
+ if (!ret) {
+ sensor->crop = tmp_crop_rect;
+ sensor->format = tmp_format;
+ }
+ return ret;
+ }
+
+ return ret;
+}
+
+static int mt9m032_get_frame_interval(struct v4l2_subdev *subdev,
+ struct v4l2_subdev_frame_interval *fi)
+{
+ struct mt9m032 *sensor = to_mt9m032(subdev);
+
+ fi->pad = 0;
+ memset(fi->reserved, 0, sizeof(fi->reserved));
+ fi->interval = sensor->frame_interval;
+
+ return 0;
+}
+
+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));
+
+ ret = mt9m032_update_timing(sensor, &fi->interval, NULL);
+ if (!ret)
+ sensor->frame_interval = fi->interval;
+ return ret;
+}
+
+#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_reg(sensor, 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;
+
+ if (mt9m032_write_reg(sensor, reg->reg, reg->val) < 0)
+ return -EIO;
+
+ return 0;
+}
+#endif
+
+static int update_read_mode2(struct mt9m032 *sensor, bool vflip, bool hflip)
+{
+ int reg_val = (!!vflip) << MT9M032_READ_MODE2_VFLIP_SHIFT
+ | (!!hflip) << MT9M032_READ_MODE2_HFLIP_SHIFT
+ | MT9M032_READ_MODE2_ROW_BLC
+ | 0x0007;
+
+ return mt9m032_write_reg(sensor, MT9M032_READ_MODE2, reg_val);
+}
+
+static int mt9m032_set_hflip(struct mt9m032 *sensor, s32 val)
+{
+ return update_read_mode2(sensor, sensor->vflip->cur.val, val);
+}
+
+static int mt9m032_set_vflip(struct mt9m032 *sensor, s32 val)
+{
+ return update_read_mode2(sensor, val, sensor->hflip->cur.val);
+}
+
+static int mt9m032_set_exposure(struct mt9m032 *sensor, s32 val)
+{
+ int shutter_width;
+ u16 high_val, low_val;
+ int ret;
+
+ /* shutter width is in row times */
+ shutter_width = (val * 1000) / mt9m032_row_time(sensor, sensor->crop.width);
+
+ high_val = (shutter_width >> 16) & 0xf;
+ low_val = shutter_width & 0xffff;
+
+ ret = mt9m032_write_reg(sensor, MT9M032_SHUTTER_WIDTH_HIGH, high_val);
+ if (!ret)
+ ret = mt9m032_write_reg(sensor, MT9M032_SHUTTER_WIDTH_LOW, low_val);
+
+ return ret;
+}
+
+static int mt9m032_set_gain(struct mt9m032 *sensor, s32 val)
+{
+ 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_reg(sensor, MT9M032_GAIN_ALL, reg_val);
+}
+
+static int mt9m032_setup_pll(struct mt9m032 *sensor)
+{
+ struct mt9m032_platform_data* pdata = sensor->pdata;
+ u16 reg_pll1;
+ unsigned int pre_div;
+ int res, ret;
+
+ /* TODO: also support other pre-div values */
+ if (pdata->pll_pre_div != 6) {
+ dev_warn(to_dev(sensor),
+ "Unsupported PLL pre-divisor value %u, using default 6\n",
+ pdata->pll_pre_div);
+ }
+ pre_div = 6;
+
+ sensor->pix_clock = pdata->ext_clock * pdata->pll_mul /
+ (pre_div * pdata->pll_out_div);
+
+ reg_pll1 = ((pdata->pll_out_div - 1) & MT9M032_PLL_CONFIG1_OUTDIV_MASK)
+ | pdata->pll_mul << MT9M032_PLL_CONFIG1_MUL_SHIFT;
+
+ ret = mt9m032_write_reg(sensor, MT9M032_PLL_CONFIG1, reg_pll1);
+ if (!ret)
+ ret = mt9m032_write_reg(sensor,
+ MT9P031_PLL_CONTROL,
+ MT9P031_PLL_CONTROL_PWRON | MT9P031_PLL_CONTROL_USEPLL);
+
+ if (!ret)
+ ret = mt9m032_write_reg(sensor, MT9M032_READ_MODE1, 0x8006);
+ /* more reserved, Continuous */
+ /* Master Mode */
+ if (!ret)
+ res = mt9m032_read_reg(sensor, MT9M032_READ_MODE1);
+
+ if (!ret)
+ ret = mt9m032_write_reg(sensor, MT9M032_FORMATTER1, 0x111e);
+ /* Set 14-bit mode, select 7 divider */
+
+ return ret;
+}
+
+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);
+
+ switch (ctrl->id) {
+ case V4L2_CID_GAIN:
+ return mt9m032_set_gain(sensor, ctrl->val);
+
+ case V4L2_CID_HFLIP:
+ return mt9m032_set_hflip(sensor, ctrl->val);
+
+ case V4L2_CID_VFLIP:
+ return mt9m032_set_vflip(sensor, ctrl->val);
+
+ case V4L2_CID_EXPOSURE:
+ return mt9m032_set_exposure(sensor, ctrl->val);
+
+ default:
+ return -EINVAL;
+ }
+}
+
+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 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_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,
+};
+
+static int mt9m032_probe(struct i2c_client *client,
+ const struct i2c_device_id *devid)
+{
+ struct mt9m032 *sensor;
+ int chip_version;
+ int res, ret;
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
+ dev_warn(&client->adapter->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;
+
+ /*
+ * This driver was developed with a camera module with seperate external
+ * pix clock. For setups which use the clock from the camera interface
+ * the code will need to be extended with the appropriate platform
+ * callback to setup the clock.
+ */
+ chip_version = mt9m032_read_reg(sensor, MT9M032_CHIP_VERSION);
+ if (chip_version == MT9M032_CHIP_VERSION_VALUE) {
+ dev_info(&client->dev, "mt9m032: detected sensor.\n");
+ } else {
+ dev_warn(&client->dev, "mt9m032: error: detected unsupported chip version 0x%x\n",
+ chip_version);
+ ret = -ENODEV;
+ goto free_sensor;
+ }
+
+ 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, 0, 8000, 1, 1700); /* 1.7ms */
+
+
+ if (sensor->ctrls.error) {
+ ret = sensor->ctrls.error;
+ dev_err(&client->dev, "control initialization error %d\n", ret);
+ goto free_ctrl;
+ }
+
+ 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_reg(sensor, MT9M032_RESET, 1); /* reset on */
+ if (ret < 0)
+ goto free_ctrl;
+ mt9m032_write_reg(sensor, MT9M032_RESET, 0); /* reset off */
+ if (ret < 0)
+ goto free_ctrl;
+
+ ret = mt9m032_setup_pll(sensor);
+ if (ret < 0)
+ goto free_ctrl;
+ msleep(10);
+
+ v4l2_ctrl_handler_setup(&sensor->ctrls);
+
+ /* SIZE */
+ ret = mt9m032_update_geom_timing(sensor, &sensor->crop);
+ if (ret < 0)
+ goto free_ctrl;
+
+ ret = mt9m032_write_reg(sensor, 0x41, 0x0000); /* reserved !!! */
+ if (ret < 0)
+ goto free_ctrl;
+ ret = mt9m032_write_reg(sensor, 0x42, 0x0003); /* reserved !!! */
+ if (ret < 0)
+ goto free_ctrl;
+ ret = mt9m032_write_reg(sensor, 0x43, 0x0003); /* reserved !!! */
+ if (ret < 0)
+ goto free_ctrl;
+ ret = mt9m032_write_reg(sensor, 0x7f, 0x0000); /* reserved !!! */
+ if (ret < 0)
+ goto free_ctrl;
+ if (sensor->pdata->invert_pixclock) {
+ mt9m032_write_reg(sensor, MT9M032_PIX_CLK_CTRL, MT9M032_PIX_CLK_CTRL_INV_PIXCLK);
+ if (ret < 0)
+ goto free_ctrl;
+ }
+
+ res = mt9m032_read_reg(sensor, MT9M032_PIX_CLK_CTRL);
+
+ ret = mt9m032_write_reg(sensor, MT9M032_RESTART, 1); /* Restart on */
+ if (ret < 0)
+ goto free_ctrl;
+ msleep(100);
+ ret = mt9m032_write_reg(sensor, 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,
+};
+
+static int __init mt9m032_init(void)
+{
+ int rval;
+
+ rval = i2c_add_driver(&mt9m032_i2c_driver);
+ if (rval)
+ pr_err("%s: failed registering " MT9M032_NAME "\n", __func__);
+
+ return rval;
+}
+
+static void mt9m032_exit(void)
+{
+ i2c_del_driver(&mt9m032_i2c_driver);
+}
+
+module_init(mt9m032_init);
+module_exit(mt9m032_exit);
+
+MODULE_AUTHOR("Martin Hostettler <martin@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..94cefc5
--- /dev/null
+++ b/include/media/mt9m032.h
@@ -0,0 +1,38 @@
+/*
+ * Driver for MT9M032 CMOS Image Sensor from Micron
+ *
+ * Copyright (C) 2010-2011 Lund Engineering
+ * Contact: Gil Lund <gwlund@lundeng.com>
+ * Author: Martin Hostettler <martin@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 pll_pre_div;
+ u32 pll_mul;
+ u32 pll_out_div;
+ int invert_pixclock;
+
+};
+#endif /* MT9M032_H */
--
1.7.3.4