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[media] v4l: Add driver for Micron MT9M032 camera sensor

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.

[Lots of clean up, fixes and enhancements]

Signed-off-by: Martin Hostettler <martin@neutronstar.dyndns.org>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Acked-by: Sakari Ailus <sakari.ailus@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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1 parent 08cd43c commit 251cb88e2e231a00601dbc95647ac8f13ffdec24 @textshell textshell committed with Mauro Carvalho Chehab Dec 17, 2011
Showing with 913 additions and 0 deletions.
  1. +8 −0 drivers/media/video/Kconfig
  2. +1 −0 drivers/media/video/Makefile
  3. +868 −0 drivers/media/video/mt9m032.c
  4. +36 −0 include/media/mt9m032.h
View
8 drivers/media/video/Kconfig
@@ -490,6 +490,14 @@ config VIDEO_VS6624
To compile this driver as a module, choose M here: the
module will be called vs6624.
+config VIDEO_MT9M032
+ tristate "MT9M032 camera sensor support"
+ depends on I2C && VIDEO_V4L2
+ select VIDEO_APTINA_PLL
+ ---help---
+ This driver supports MT9M032 camera sensors from Aptina, monochrome
+ models only.
+
config VIDEO_MT9P031
tristate "Aptina MT9P031 support"
depends on I2C && VIDEO_V4L2 && VIDEO_V4L2_SUBDEV_API
View
1 drivers/media/video/Makefile
@@ -70,6 +70,7 @@ obj-$(CONFIG_VIDEO_UPD64083) += upd64083.o
obj-$(CONFIG_VIDEO_OV7670) += ov7670.o
obj-$(CONFIG_VIDEO_TCM825X) += tcm825x.o
obj-$(CONFIG_VIDEO_TVEEPROM) += tveeprom.o
+obj-$(CONFIG_VIDEO_MT9M032) += mt9m032.o
obj-$(CONFIG_VIDEO_MT9P031) += mt9p031.o
obj-$(CONFIG_VIDEO_MT9T001) += mt9t001.o
obj-$(CONFIG_VIDEO_MT9V011) += mt9v011.o
View
868 drivers/media/video/mt9m032.c
@@ -0,0 +1,868 @@
+/*
+ * 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/mutex.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 boundary
+ * column 16-1455 image
+ * column 1456-1471 active boundary
+ * column 1472-1599 black
+ *
+ * row 0- 51 black
+ * row 53- 59 active boundary
+ * row 60-1139 image
+ * row 1140-1147 active boundary
+ * 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;
+
+ unsigned int pix_clock;
+
+ struct v4l2_ctrl_handler ctrls;
+ struct {
+ struct v4l2_ctrl *hflip;
+ struct v4l2_ctrl *vflip;
+ };
+
+ struct mutex lock; /* Protects streaming, format, interval and crop */
+
+ bool streaming;
+
+ 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; /* empirical value */
+ 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;
+
+ ret = aptina_pll_calculate(&client->dev, &limits, &pll);
+ if (ret < 0)
+ return ret;
+
+ sensor->pix_clock = pdata->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);
+
+ 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: file handle 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;
+ }
+}
+
+/**
+ * __mt9m032_get_pad_format() - get format
+ * @sensor: pointer to the sensor struct
+ * @fh: file handle 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;
+ }
+}
+
+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);
+
+ mutex_lock(&sensor->lock);
+ fmt->format = *__mt9m032_get_pad_format(sensor, fh, fmt->which);
+ mutex_unlock(&sensor->lock);
+
+ 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);
+ int ret;
+
+ mutex_lock(&sensor->lock);
+
+ if (sensor->streaming && fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
+ ret = -EBUSY;
+ goto done;
+ }
+
+ /* Scaling is not supported, the format is thus fixed. */
+ ret = mt9m032_get_pad_format(subdev, fh, fmt);
+
+done:
+ mutex_lock(&sensor->lock);
+ return ret;
+}
+
+static int mt9m032_get_pad_crop(struct v4l2_subdev *subdev,
+ struct v4l2_subdev_fh *fh,
+ struct v4l2_subdev_crop *crop)
+{
+ struct mt9m032 *sensor = to_mt9m032(subdev);
+
+ mutex_lock(&sensor->lock);
+ crop->rect = *__mt9m032_get_pad_crop(sensor, fh, crop->which);
+ mutex_unlock(&sensor->lock);
+
+ return 0;
+}
+
+static int mt9m032_set_pad_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;
+ int ret = 0;
+
+ mutex_lock(&sensor->lock);
+
+ if (sensor->streaming && crop->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
+ ret = -EBUSY;
+ goto done;
+ }
+
+ /* 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;
+ }
+
+ *__crop = rect;
+ crop->rect = rect;
+
+ if (crop->which == V4L2_SUBDEV_FORMAT_ACTIVE)
+ ret = mt9m032_update_geom_timing(sensor);
+
+done:
+ mutex_unlock(&sensor->lock);
+ return ret;
+}
+
+static int mt9m032_get_frame_interval(struct v4l2_subdev *subdev,
+ struct v4l2_subdev_frame_interval *fi)
+{
+ struct mt9m032 *sensor = to_mt9m032(subdev);
+
+ mutex_lock(&sensor->lock);
+ memset(fi, 0, sizeof(*fi));
+ fi->interval = sensor->frame_interval;
+ mutex_unlock(&sensor->lock);
+
+ 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;
+
+ mutex_lock(&sensor->lock);
+
+ if (sensor->streaming) {
+ ret = -EBUSY;
+ goto done;
+ }
+
+ /* Avoid divisions by 0. */
+ if (fi->interval.denominator == 0)
+ fi->interval.denominator = 1;
+
+ ret = mt9m032_update_timing(sensor, &fi->interval);
+ if (!ret)
+ sensor->frame_interval = fi->interval;
+
+done:
+ mutex_unlock(&sensor->lock);
+ return ret;
+}
+
+static int mt9m032_s_stream(struct v4l2_subdev *subdev, int streaming)
+{
+ struct mt9m032 *sensor = to_mt9m032(subdev);
+ int ret;
+
+ mutex_lock(&sensor->lock);
+ ret = update_formatter2(sensor, streaming);
+ if (!ret)
+ sensor->streaming = streaming;
+ mutex_unlock(&sensor->lock);
+
+ 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);
+
+ case V4L2_CID_HFLIP:
+ /* case V4L2_CID_VFLIP: -- In the same cluster */
+ 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);
+ }
+
+ return 0;
+}
+
+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_pad_crop,
+ .get_crop = mt9m032_get_pad_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;
+
+ mutex_init(&sensor->lock);
+
+ 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 error_sensor;
+ }
+
+ dev_info(&client->dev, "MT9M032 detected at address 0x%02x\n",
+ client->addr);
+
+ sensor->frame_interval.numerator = 1;
+ sensor->frame_interval.denominator = 30;
+
+ sensor->crop.left = MT9M032_COLUMN_START_DEF;
+ sensor->crop.top = MT9M032_ROW_START_DEF;
+ sensor->crop.width = MT9M032_COLUMN_SIZE_DEF;
+ sensor->crop.height = MT9M032_ROW_SIZE_DEF;
+
+ 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 error_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 error_ctrl;
+
+ ret = mt9m032_write(client, MT9M032_RESET, 1); /* reset on */
+ if (ret < 0)
+ goto error_entity;
+ mt9m032_write(client, MT9M032_RESET, 0); /* reset off */
+ if (ret < 0)
+ goto error_entity;
+
+ ret = mt9m032_setup_pll(sensor);
+ if (ret < 0)
+ goto error_entity;
+ usleep_range(10000, 11000);
+
+ ret = v4l2_ctrl_handler_setup(&sensor->ctrls);
+ if (ret < 0)
+ goto error_entity;
+
+ /* SIZE */
+ ret = mt9m032_update_geom_timing(sensor);
+ if (ret < 0)
+ goto error_entity;
+
+ ret = mt9m032_write(client, 0x41, 0x0000); /* reserved !!! */
+ if (ret < 0)
+ goto error_entity;
+ ret = mt9m032_write(client, 0x42, 0x0003); /* reserved !!! */
+ if (ret < 0)
+ goto error_entity;
+ ret = mt9m032_write(client, 0x43, 0x0003); /* reserved !!! */
+ if (ret < 0)
+ goto error_entity;
+ ret = mt9m032_write(client, 0x7f, 0x0000); /* reserved !!! */
+ if (ret < 0)
+ goto error_entity;
+ if (sensor->pdata->invert_pixclock) {
+ ret = mt9m032_write(client, MT9M032_PIX_CLK_CTRL,
+ MT9M032_PIX_CLK_CTRL_INV_PIXCLK);
+ if (ret < 0)
+ goto error_entity;
+ }
+
+ ret = mt9m032_write(client, MT9M032_RESTART, 1); /* Restart on */
+ if (ret < 0)
+ goto error_entity;
+ msleep(100);
+ ret = mt9m032_write(client, MT9M032_RESTART, 0); /* Restart off */
+ if (ret < 0)
+ goto error_entity;
+ msleep(100);
+ ret = update_formatter2(sensor, false);
+ if (ret < 0)
+ goto error_entity;
+
+ return ret;
+
+error_entity:
+ media_entity_cleanup(&sensor->subdev.entity);
+error_ctrl:
+ v4l2_ctrl_handler_free(&sensor->ctrls);
+error_sensor:
+ mutex_destroy(&sensor->lock);
+ 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);
+ mutex_destroy(&sensor->lock);
+ 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 <martin@neutronstar.dyndns.org>");
+MODULE_DESCRIPTION("MT9M032 camera sensor driver");
+MODULE_LICENSE("GPL v2");
View
36 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 <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 pix_clock;
+ bool invert_pixclock;
+
+};
+#endif /* MT9M032_H */

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