[media] mt9t001: Aptina (Micron) MT9T001 3MP sensor driver
authorLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Mon, 14 Jun 2010 12:47:50 +0000 (09:47 -0300)
committerMauro Carvalho Chehab <mchehab@redhat.com>
Wed, 21 Sep 2011 18:31:08 +0000 (15:31 -0300)
The MT9T001 is a parallel 3MP sensor from Aptina (formerly Micron)
controlled through I2C.

The driver creates a V4L2 subdevice. It currently supports binning and
cropping, and the gain, exposure, test pattern and black level controls.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
drivers/media/video/Kconfig
drivers/media/video/Makefile
drivers/media/video/mt9t001.c [new file with mode: 0644]
include/media/mt9t001.h [new file with mode: 0644]

index f41ae69eb681a1ff673e101fa3954ff7d75e7e64..4a10086bb46064e177d0976d84ed58e8bb9e086d 100644 (file)
@@ -474,6 +474,13 @@ config VIDEO_MT9P031
          This is a Video4Linux2 sensor-level driver for the Aptina
          (Micron) mt9p031 5 Mpixel camera.
 
+config VIDEO_MT9T001
+       tristate "Aptina MT9T001 support"
+       depends on I2C && VIDEO_V4L2
+       ---help---
+         This is a Video4Linux2 sensor-level driver for the Aptina
+         (Micron) mt0t001 3 Mpixel camera.
+
 config VIDEO_MT9V011
        tristate "Micron mt9v011 sensor support"
        depends on I2C && VIDEO_V4L2
index f52a7712e43ec0ddca367c264377909b021defc3..0f0c6af58d81898f24e23e42ea10f16b31b3fcd9 100644 (file)
@@ -66,6 +66,7 @@ obj-$(CONFIG_VIDEO_OV7670)    += ov7670.o
 obj-$(CONFIG_VIDEO_TCM825X) += tcm825x.o
 obj-$(CONFIG_VIDEO_TVEEPROM) += tveeprom.o
 obj-$(CONFIG_VIDEO_MT9P031) += mt9p031.o
+obj-$(CONFIG_VIDEO_MT9T001) += mt9t001.o
 obj-$(CONFIG_VIDEO_MT9V011) += mt9v011.o
 obj-$(CONFIG_VIDEO_MT9V032) += mt9v032.o
 obj-$(CONFIG_VIDEO_SR030PC30)  += sr030pc30.o
diff --git a/drivers/media/video/mt9t001.c b/drivers/media/video/mt9t001.c
new file mode 100644 (file)
index 0000000..cac1416
--- /dev/null
@@ -0,0 +1,835 @@
+/*
+ * Driver for MT9T001 CMOS Image Sensor from Aptina (Micron)
+ *
+ * Copyright (C) 2010-2011, Laurent Pinchart <laurent.pinchart@ideasonboard.com>
+ *
+ * Based on the MT9M001 driver,
+ *
+ * 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/i2c.h>
+#include <linux/log2.h>
+#include <linux/slab.h>
+#include <linux/videodev2.h>
+#include <linux/v4l2-mediabus.h>
+
+#include <media/mt9t001.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-subdev.h>
+
+#define MT9T001_PIXEL_ARRAY_HEIGHT                     1568
+#define MT9T001_PIXEL_ARRAY_WIDTH                      2112
+
+#define MT9T001_CHIP_VERSION                           0x00
+#define                MT9T001_CHIP_ID                         0x1621
+#define MT9T001_ROW_START                              0x01
+#define                MT9T001_ROW_START_MIN                   0
+#define                MT9T001_ROW_START_DEF                   20
+#define                MT9T001_ROW_START_MAX                   1534
+#define MT9T001_COLUMN_START                           0x02
+#define                MT9T001_COLUMN_START_MIN                0
+#define                MT9T001_COLUMN_START_DEF                32
+#define                MT9T001_COLUMN_START_MAX                2046
+#define MT9T001_WINDOW_HEIGHT                          0x03
+#define                MT9T001_WINDOW_HEIGHT_MIN               1
+#define                MT9T001_WINDOW_HEIGHT_DEF               1535
+#define                MT9T001_WINDOW_HEIGHT_MAX               1567
+#define MT9T001_WINDOW_WIDTH                           0x04
+#define                MT9T001_WINDOW_WIDTH_MIN                1
+#define                MT9T001_WINDOW_WIDTH_DEF                2047
+#define                MT9T001_WINDOW_WIDTH_MAX                2111
+#define MT9T001_HORIZONTAL_BLANKING                    0x05
+#define                MT9T001_HORIZONTAL_BLANKING_MIN         21
+#define                MT9T001_HORIZONTAL_BLANKING_MAX         1023
+#define MT9T001_VERTICAL_BLANKING                      0x06
+#define                MT9T001_VERTICAL_BLANKING_MIN           3
+#define                MT9T001_VERTICAL_BLANKING_MAX           1023
+#define MT9T001_OUTPUT_CONTROL                         0x07
+#define                MT9T001_OUTPUT_CONTROL_SYNC             (1 << 0)
+#define                MT9T001_OUTPUT_CONTROL_CHIP_ENABLE      (1 << 1)
+#define                MT9T001_OUTPUT_CONTROL_TEST_DATA        (1 << 6)
+#define MT9T001_SHUTTER_WIDTH_HIGH                     0x08
+#define MT9T001_SHUTTER_WIDTH_LOW                      0x09
+#define                MT9T001_SHUTTER_WIDTH_MIN               1
+#define                MT9T001_SHUTTER_WIDTH_DEF               1561
+#define                MT9T001_SHUTTER_WIDTH_MAX               (1024 * 1024)
+#define MT9T001_PIXEL_CLOCK                            0x0a
+#define                MT9T001_PIXEL_CLOCK_INVERT              (1 << 15)
+#define                MT9T001_PIXEL_CLOCK_SHIFT_MASK          (7 << 8)
+#define                MT9T001_PIXEL_CLOCK_SHIFT_SHIFT         8
+#define                MT9T001_PIXEL_CLOCK_DIVIDE_MASK         (0x7f << 0)
+#define MT9T001_FRAME_RESTART                          0x0b
+#define MT9T001_SHUTTER_DELAY                          0x0c
+#define                MT9T001_SHUTTER_DELAY_MAX               2047
+#define MT9T001_RESET                                  0x0d
+#define MT9T001_READ_MODE1                             0x1e
+#define                MT9T001_READ_MODE_SNAPSHOT              (1 << 8)
+#define                MT9T001_READ_MODE_STROBE_ENABLE         (1 << 9)
+#define                MT9T001_READ_MODE_STROBE_WIDTH          (1 << 10)
+#define                MT9T001_READ_MODE_STROBE_OVERRIDE       (1 << 11)
+#define MT9T001_READ_MODE2                             0x20
+#define                MT9T001_READ_MODE_BAD_FRAMES            (1 << 0)
+#define                MT9T001_READ_MODE_LINE_VALID_CONTINUOUS (1 << 9)
+#define                MT9T001_READ_MODE_LINE_VALID_FRAME      (1 << 10)
+#define MT9T001_READ_MODE3                             0x21
+#define                MT9T001_READ_MODE_GLOBAL_RESET          (1 << 0)
+#define                MT9T001_READ_MODE_GHST_CTL              (1 << 1)
+#define MT9T001_ROW_ADDRESS_MODE                       0x22
+#define                MT9T001_ROW_SKIP_MASK                   (7 << 0)
+#define                MT9T001_ROW_BIN_MASK                    (3 << 3)
+#define                MT9T001_ROW_BIN_SHIFT                   3
+#define MT9T001_COLUMN_ADDRESS_MODE                    0x23
+#define                MT9T001_COLUMN_SKIP_MASK                (7 << 0)
+#define                MT9T001_COLUMN_BIN_MASK                 (3 << 3)
+#define                MT9T001_COLUMN_BIN_SHIFT                3
+#define MT9T001_GREEN1_GAIN                            0x2b
+#define MT9T001_BLUE_GAIN                              0x2c
+#define MT9T001_RED_GAIN                               0x2d
+#define MT9T001_GREEN2_GAIN                            0x2e
+#define MT9T001_TEST_DATA                              0x32
+#define MT9T001_GLOBAL_GAIN                            0x35
+#define                MT9T001_GLOBAL_GAIN_MIN                 8
+#define                MT9T001_GLOBAL_GAIN_MAX                 1024
+#define MT9T001_BLACK_LEVEL                            0x49
+#define MT9T001_ROW_BLACK_DEFAULT_OFFSET               0x4b
+#define MT9T001_BLC_DELTA_THRESHOLDS                   0x5d
+#define MT9T001_CAL_THRESHOLDS                         0x5f
+#define MT9T001_GREEN1_OFFSET                          0x60
+#define MT9T001_GREEN2_OFFSET                          0x61
+#define MT9T001_BLACK_LEVEL_CALIBRATION                        0x62
+#define                MT9T001_BLACK_LEVEL_OVERRIDE            (1 << 0)
+#define                MT9T001_BLACK_LEVEL_DISABLE_OFFSET      (1 << 1)
+#define                MT9T001_BLACK_LEVEL_RECALCULATE         (1 << 12)
+#define                MT9T001_BLACK_LEVEL_LOCK_RED_BLUE       (1 << 13)
+#define                MT9T001_BLACK_LEVEL_LOCK_GREEN          (1 << 14)
+#define MT9T001_RED_OFFSET                             0x63
+#define MT9T001_BLUE_OFFSET                            0x64
+
+struct mt9t001 {
+       struct v4l2_subdev subdev;
+       struct media_pad pad;
+
+       struct v4l2_mbus_framefmt format;
+       struct v4l2_rect crop;
+
+       struct v4l2_ctrl_handler ctrls;
+       struct v4l2_ctrl *gains[4];
+
+       u16 output_control;
+       u16 black_level;
+};
+
+static inline struct mt9t001 *to_mt9t001(struct v4l2_subdev *sd)
+{
+       return container_of(sd, struct mt9t001, subdev);
+}
+
+static int mt9t001_read(struct i2c_client *client, u8 reg)
+{
+       s32 data = i2c_smbus_read_word_data(client, reg);
+       return data < 0 ? data : be16_to_cpu(data);
+}
+
+static int mt9t001_write(struct i2c_client *client, u8 reg, u16 data)
+{
+       return i2c_smbus_write_word_data(client, reg, cpu_to_be16(data));
+}
+
+static int mt9t001_set_output_control(struct mt9t001 *mt9t001, u16 clear,
+                                     u16 set)
+{
+       struct i2c_client *client = v4l2_get_subdevdata(&mt9t001->subdev);
+       u16 value = (mt9t001->output_control & ~clear) | set;
+       int ret;
+
+       if (value == mt9t001->output_control)
+               return 0;
+
+       ret = mt9t001_write(client, MT9T001_OUTPUT_CONTROL, value);
+       if (ret < 0)
+               return ret;
+
+       mt9t001->output_control = value;
+       return 0;
+}
+
+/* -----------------------------------------------------------------------------
+ * V4L2 subdev video operations
+ */
+
+static struct v4l2_mbus_framefmt *
+__mt9t001_get_pad_format(struct mt9t001 *mt9t001, struct v4l2_subdev_fh *fh,
+                        unsigned int pad, enum v4l2_subdev_format_whence which)
+{
+       switch (which) {
+       case V4L2_SUBDEV_FORMAT_TRY:
+               return v4l2_subdev_get_try_format(fh, pad);
+       case V4L2_SUBDEV_FORMAT_ACTIVE:
+               return &mt9t001->format;
+       default:
+               return NULL;
+       }
+}
+
+static struct v4l2_rect *
+__mt9t001_get_pad_crop(struct mt9t001 *mt9t001, struct v4l2_subdev_fh *fh,
+                      unsigned int pad, enum v4l2_subdev_format_whence which)
+{
+       switch (which) {
+       case V4L2_SUBDEV_FORMAT_TRY:
+               return v4l2_subdev_get_try_crop(fh, pad);
+       case V4L2_SUBDEV_FORMAT_ACTIVE:
+               return &mt9t001->crop;
+       default:
+               return NULL;
+       }
+}
+
+static int mt9t001_s_stream(struct v4l2_subdev *subdev, int enable)
+{
+       const u16 mode = MT9T001_OUTPUT_CONTROL_CHIP_ENABLE;
+       struct i2c_client *client = v4l2_get_subdevdata(subdev);
+       struct mt9t001 *mt9t001 = to_mt9t001(subdev);
+       struct v4l2_mbus_framefmt *format = &mt9t001->format;
+       struct v4l2_rect *crop = &mt9t001->crop;
+       unsigned int hratio;
+       unsigned int vratio;
+       int ret;
+
+       if (!enable)
+               return mt9t001_set_output_control(mt9t001, mode, 0);
+
+       /* Configure the window size and row/column bin */
+       hratio = DIV_ROUND_CLOSEST(crop->width, format->width);
+       vratio = DIV_ROUND_CLOSEST(crop->height, format->height);
+
+       ret = mt9t001_write(client, MT9T001_ROW_ADDRESS_MODE, hratio - 1);
+       if (ret < 0)
+               return ret;
+
+       ret = mt9t001_write(client, MT9T001_COLUMN_ADDRESS_MODE, vratio - 1);
+       if (ret < 0)
+               return ret;
+
+       ret = mt9t001_write(client, MT9T001_COLUMN_START, crop->left);
+       if (ret < 0)
+               return ret;
+
+       ret = mt9t001_write(client, MT9T001_ROW_START, crop->top);
+       if (ret < 0)
+               return ret;
+
+       ret = mt9t001_write(client, MT9T001_WINDOW_WIDTH, crop->width - 1);
+       if (ret < 0)
+               return ret;
+
+       ret = mt9t001_write(client, MT9T001_WINDOW_HEIGHT, crop->height - 1);
+       if (ret < 0)
+               return ret;
+
+       /* Switch to master "normal" mode */
+       return mt9t001_set_output_control(mt9t001, 0, mode);
+}
+
+static int mt9t001_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_SGRBG10_1X10;
+       return 0;
+}
+
+static int mt9t001_enum_frame_size(struct v4l2_subdev *subdev,
+                                  struct v4l2_subdev_fh *fh,
+                                  struct v4l2_subdev_frame_size_enum *fse)
+{
+       if (fse->index >= 8 || fse->code != V4L2_MBUS_FMT_SGRBG10_1X10)
+               return -EINVAL;
+
+       fse->min_width = (MT9T001_WINDOW_WIDTH_DEF + 1) / fse->index;
+       fse->max_width = fse->min_width;
+       fse->min_height = (MT9T001_WINDOW_HEIGHT_DEF + 1) / fse->index;
+       fse->max_height = fse->min_height;
+
+       return 0;
+}
+
+static int mt9t001_get_format(struct v4l2_subdev *subdev,
+                             struct v4l2_subdev_fh *fh,
+                             struct v4l2_subdev_format *format)
+{
+       struct mt9t001 *mt9t001 = to_mt9t001(subdev);
+
+       format->format = *__mt9t001_get_pad_format(mt9t001, fh, format->pad,
+                                                  format->which);
+       return 0;
+}
+
+static int mt9t001_set_format(struct v4l2_subdev *subdev,
+                             struct v4l2_subdev_fh *fh,
+                             struct v4l2_subdev_format *format)
+{
+       struct mt9t001 *mt9t001 = to_mt9t001(subdev);
+       struct v4l2_mbus_framefmt *__format;
+       struct v4l2_rect *__crop;
+       unsigned int width;
+       unsigned int height;
+       unsigned int hratio;
+       unsigned int vratio;
+
+       __crop = __mt9t001_get_pad_crop(mt9t001, fh, format->pad,
+                                       format->which);
+
+       /* Clamp the width and height to avoid dividing by zero. */
+       width = clamp_t(unsigned int, ALIGN(format->format.width, 2),
+                       max(__crop->width / 8, MT9T001_WINDOW_HEIGHT_MIN + 1),
+                       __crop->width);
+       height = clamp_t(unsigned int, ALIGN(format->format.height, 2),
+                        max(__crop->height / 8, MT9T001_WINDOW_HEIGHT_MIN + 1),
+                        __crop->height);
+
+       hratio = DIV_ROUND_CLOSEST(__crop->width, width);
+       vratio = DIV_ROUND_CLOSEST(__crop->height, height);
+
+       __format = __mt9t001_get_pad_format(mt9t001, fh, format->pad,
+                                           format->which);
+       __format->width = __crop->width / hratio;
+       __format->height = __crop->height / vratio;
+
+       format->format = *__format;
+
+       return 0;
+}
+
+static int mt9t001_get_crop(struct v4l2_subdev *subdev,
+                           struct v4l2_subdev_fh *fh,
+                           struct v4l2_subdev_crop *crop)
+{
+       struct mt9t001 *mt9t001 = to_mt9t001(subdev);
+
+       crop->rect = *__mt9t001_get_pad_crop(mt9t001, fh, crop->pad,
+                                            crop->which);
+       return 0;
+}
+
+static int mt9t001_set_crop(struct v4l2_subdev *subdev,
+                           struct v4l2_subdev_fh *fh,
+                           struct v4l2_subdev_crop *crop)
+{
+       struct mt9t001 *mt9t001 = to_mt9t001(subdev);
+       struct v4l2_mbus_framefmt *__format;
+       struct v4l2_rect *__crop;
+       struct v4l2_rect rect;
+
+       /* Clamp the crop rectangle boundaries and align them to a multiple of 2
+        * pixels.
+        */
+       rect.left = clamp(ALIGN(crop->rect.left, 2),
+                         MT9T001_COLUMN_START_MIN,
+                         MT9T001_COLUMN_START_MAX);
+       rect.top = clamp(ALIGN(crop->rect.top, 2),
+                        MT9T001_ROW_START_MIN,
+                        MT9T001_ROW_START_MAX);
+       rect.width = clamp(ALIGN(crop->rect.width, 2),
+                          MT9T001_WINDOW_WIDTH_MIN + 1,
+                          MT9T001_WINDOW_WIDTH_MAX + 1);
+       rect.height = clamp(ALIGN(crop->rect.height, 2),
+                           MT9T001_WINDOW_HEIGHT_MIN + 1,
+                           MT9T001_WINDOW_HEIGHT_MAX + 1);
+
+       rect.width = min(rect.width, MT9T001_PIXEL_ARRAY_WIDTH - rect.left);
+       rect.height = min(rect.height, MT9T001_PIXEL_ARRAY_HEIGHT - rect.top);
+
+       __crop = __mt9t001_get_pad_crop(mt9t001, fh, crop->pad, 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 = __mt9t001_get_pad_format(mt9t001, fh, crop->pad,
+                                                   crop->which);
+               __format->width = rect.width;
+               __format->height = rect.height;
+       }
+
+       *__crop = rect;
+       crop->rect = rect;
+
+       return 0;
+}
+
+/* -----------------------------------------------------------------------------
+ * V4L2 subdev control operations
+ */
+
+#define V4L2_CID_TEST_PATTERN          (V4L2_CID_USER_BASE | 0x1001)
+#define V4L2_CID_BLACK_LEVEL_AUTO      (V4L2_CID_USER_BASE | 0x1002)
+#define V4L2_CID_BLACK_LEVEL_OFFSET    (V4L2_CID_USER_BASE | 0x1003)
+#define V4L2_CID_BLACK_LEVEL_CALIBRATE (V4L2_CID_USER_BASE | 0x1004)
+
+#define V4L2_CID_GAIN_RED              (V4L2_CTRL_CLASS_CAMERA | 0x1001)
+#define V4L2_CID_GAIN_GREEN_RED                (V4L2_CTRL_CLASS_CAMERA | 0x1002)
+#define V4L2_CID_GAIN_GREEN_BLUE       (V4L2_CTRL_CLASS_CAMERA | 0x1003)
+#define V4L2_CID_GAIN_BLUE             (V4L2_CTRL_CLASS_CAMERA | 0x1004)
+
+static u16 mt9t001_gain_value(s32 *gain)
+{
+       /* Gain is controlled by 2 analog stages and a digital stage. Valid
+        * values for the 3 stages are
+        *
+        * Stage                Min     Max     Step
+        * ------------------------------------------
+        * First analog stage   x1      x2      1
+        * Second analog stage  x1      x4      0.125
+        * Digital stage        x1      x16     0.125
+        *
+        * To minimize noise, the gain stages should be used in the second
+        * analog stage, first analog stage, digital stage order. Gain from a
+        * previous stage should be pushed to its maximum value before the next
+        * stage is used.
+        */
+       if (*gain <= 32)
+               return *gain;
+
+       if (*gain <= 64) {
+               *gain &= ~1;
+               return (1 << 6) | (*gain >> 1);
+       }
+
+       *gain &= ~7;
+       return ((*gain - 64) << 5) | (1 << 6) | 32;
+}
+
+static int mt9t001_ctrl_freeze(struct mt9t001 *mt9t001, bool freeze)
+{
+       return mt9t001_set_output_control(mt9t001,
+               freeze ? 0 : MT9T001_OUTPUT_CONTROL_SYNC,
+               freeze ? MT9T001_OUTPUT_CONTROL_SYNC : 0);
+}
+
+static int mt9t001_s_ctrl(struct v4l2_ctrl *ctrl)
+{
+       static const u8 gains[4] = {
+               MT9T001_RED_GAIN, MT9T001_GREEN1_GAIN,
+               MT9T001_GREEN2_GAIN, MT9T001_BLUE_GAIN
+       };
+
+       struct mt9t001 *mt9t001 =
+                       container_of(ctrl->handler, struct mt9t001, ctrls);
+       struct i2c_client *client = v4l2_get_subdevdata(&mt9t001->subdev);
+       unsigned int count;
+       unsigned int i;
+       u16 value;
+       int ret;
+
+       switch (ctrl->id) {
+       case V4L2_CID_GAIN_RED:
+       case V4L2_CID_GAIN_GREEN_RED:
+       case V4L2_CID_GAIN_GREEN_BLUE:
+       case V4L2_CID_GAIN_BLUE:
+
+               /* Disable control updates if more than one control has changed
+                * in the cluster.
+                */
+               for (i = 0, count = 0; i < 4; ++i) {
+                       struct v4l2_ctrl *gain = mt9t001->gains[i];
+
+                       if (gain->val != gain->cur.val)
+                               count++;
+               }
+
+               if (count > 1) {
+                       ret = mt9t001_ctrl_freeze(mt9t001, true);
+                       if (ret < 0)
+                               return ret;
+               }
+
+               /* Update the gain controls. */
+               for (i = 0; i < 4; ++i) {
+                       struct v4l2_ctrl *gain = mt9t001->gains[i];
+
+                       if (gain->val == gain->cur.val)
+                               continue;
+
+                       value = mt9t001_gain_value(&gain->val);
+                       ret = mt9t001_write(client, gains[i], value);
+                       if (ret < 0) {
+                               mt9t001_ctrl_freeze(mt9t001, false);
+                               return ret;
+                       }
+               }
+
+               /* Enable control updates. */
+               if (count > 1) {
+                       ret = mt9t001_ctrl_freeze(mt9t001, false);
+                       if (ret < 0)
+                               return ret;
+               }
+
+               break;
+
+       case V4L2_CID_EXPOSURE:
+               ret = mt9t001_write(client, MT9T001_SHUTTER_WIDTH_LOW,
+                                   ctrl->val & 0xffff);
+               if (ret < 0)
+                       return ret;
+
+               return mt9t001_write(client, MT9T001_SHUTTER_WIDTH_HIGH,
+                                    ctrl->val >> 16);
+
+       case V4L2_CID_TEST_PATTERN:
+               ret = mt9t001_set_output_control(mt9t001,
+                       ctrl->val ? 0 : MT9T001_OUTPUT_CONTROL_TEST_DATA,
+                       ctrl->val ? MT9T001_OUTPUT_CONTROL_TEST_DATA : 0);
+               if (ret < 0)
+                       return ret;
+
+               return mt9t001_write(client, MT9T001_TEST_DATA, ctrl->val << 2);
+
+       case V4L2_CID_BLACK_LEVEL_AUTO:
+               value = ctrl->val ? 0 : MT9T001_BLACK_LEVEL_OVERRIDE;
+               ret = mt9t001_write(client, MT9T001_BLACK_LEVEL_CALIBRATION,
+                                   value);
+               if (ret < 0)
+                       return ret;
+
+               mt9t001->black_level = value;
+               break;
+
+       case V4L2_CID_BLACK_LEVEL_OFFSET:
+               ret = mt9t001_write(client, MT9T001_GREEN1_OFFSET, ctrl->val);
+               if (ret < 0)
+                       return ret;
+
+               ret = mt9t001_write(client, MT9T001_GREEN2_OFFSET, ctrl->val);
+               if (ret < 0)
+                       return ret;
+
+               ret = mt9t001_write(client, MT9T001_RED_OFFSET, ctrl->val);
+               if (ret < 0)
+                       return ret;
+
+               return mt9t001_write(client, MT9T001_BLUE_OFFSET, ctrl->val);
+
+       case V4L2_CID_BLACK_LEVEL_CALIBRATE:
+               return mt9t001_write(client, MT9T001_BLACK_LEVEL_CALIBRATION,
+                                    MT9T001_BLACK_LEVEL_RECALCULATE |
+                                    mt9t001->black_level);
+       }
+
+       return 0;
+}
+
+static struct v4l2_ctrl_ops mt9t001_ctrl_ops = {
+       .s_ctrl = mt9t001_s_ctrl,
+};
+
+static const struct v4l2_ctrl_config mt9t001_ctrls[] = {
+       {
+               .ops            = &mt9t001_ctrl_ops,
+               .id             = V4L2_CID_TEST_PATTERN,
+               .type           = V4L2_CTRL_TYPE_INTEGER,
+               .name           = "Test pattern",
+               .min            = 0,
+               .max            = 1023,
+               .step           = 1,
+               .def            = 0,
+               .flags          = 0,
+       }, {
+               .ops            = &mt9t001_ctrl_ops,
+               .id             = V4L2_CID_BLACK_LEVEL_AUTO,
+               .type           = V4L2_CTRL_TYPE_BOOLEAN,
+               .name           = "Black Level, Auto",
+               .min            = 0,
+               .max            = 1,
+               .step           = 1,
+               .def            = 1,
+               .flags          = 0,
+       }, {
+               .ops            = &mt9t001_ctrl_ops,
+               .id             = V4L2_CID_BLACK_LEVEL_OFFSET,
+               .type           = V4L2_CTRL_TYPE_INTEGER,
+               .name           = "Black Level, Offset",
+               .min            = -256,
+               .max            = 255,
+               .step           = 1,
+               .def            = 32,
+               .flags          = 0,
+       }, {
+               .ops            = &mt9t001_ctrl_ops,
+               .id             = V4L2_CID_BLACK_LEVEL_CALIBRATE,
+               .type           = V4L2_CTRL_TYPE_BUTTON,
+               .name           = "Black Level, Calibrate",
+               .min            = 0,
+               .max            = 0,
+               .step           = 0,
+               .def            = 0,
+               .flags          = V4L2_CTRL_FLAG_WRITE_ONLY,
+       },
+};
+
+static const struct v4l2_ctrl_config mt9t001_gains[] = {
+       {
+               .ops            = &mt9t001_ctrl_ops,
+               .id             = V4L2_CID_GAIN_RED,
+               .type           = V4L2_CTRL_TYPE_INTEGER,
+               .name           = "Gain, Red",
+               .min            = MT9T001_GLOBAL_GAIN_MIN,
+               .max            = MT9T001_GLOBAL_GAIN_MAX,
+               .step           = 1,
+               .def            = MT9T001_GLOBAL_GAIN_MIN,
+               .flags          = 0,
+       }, {
+               .ops            = &mt9t001_ctrl_ops,
+               .id             = V4L2_CID_GAIN_GREEN_RED,
+               .type           = V4L2_CTRL_TYPE_INTEGER,
+               .name           = "Gain, Green (R)",
+               .min            = MT9T001_GLOBAL_GAIN_MIN,
+               .max            = MT9T001_GLOBAL_GAIN_MAX,
+               .step           = 1,
+               .def            = MT9T001_GLOBAL_GAIN_MIN,
+               .flags          = 0,
+       }, {
+               .ops            = &mt9t001_ctrl_ops,
+               .id             = V4L2_CID_GAIN_GREEN_BLUE,
+               .type           = V4L2_CTRL_TYPE_INTEGER,
+               .name           = "Gain, Green (B)",
+               .min            = MT9T001_GLOBAL_GAIN_MIN,
+               .max            = MT9T001_GLOBAL_GAIN_MAX,
+               .step           = 1,
+               .def            = MT9T001_GLOBAL_GAIN_MIN,
+               .flags          = 0,
+       }, {
+               .ops            = &mt9t001_ctrl_ops,
+               .id             = V4L2_CID_GAIN_BLUE,
+               .type           = V4L2_CTRL_TYPE_INTEGER,
+               .name           = "Gain, Blue",
+               .min            = MT9T001_GLOBAL_GAIN_MIN,
+               .max            = MT9T001_GLOBAL_GAIN_MAX,
+               .step           = 1,
+               .def            = MT9T001_GLOBAL_GAIN_MIN,
+               .flags          = 0,
+       },
+};
+
+/* -----------------------------------------------------------------------------
+ * V4L2 subdev internal operations
+ */
+
+static int mt9t001_open(struct v4l2_subdev *subdev, struct v4l2_subdev_fh *fh)
+{
+       struct v4l2_mbus_framefmt *format;
+       struct v4l2_rect *crop;
+
+       crop = v4l2_subdev_get_try_crop(fh, 0);
+       crop->left = MT9T001_COLUMN_START_DEF;
+       crop->top = MT9T001_ROW_START_DEF;
+       crop->width = MT9T001_WINDOW_WIDTH_DEF + 1;
+       crop->height = MT9T001_WINDOW_HEIGHT_DEF + 1;
+
+       format = v4l2_subdev_get_try_format(fh, 0);
+       format->code = V4L2_MBUS_FMT_SGRBG10_1X10;
+       format->width = MT9T001_WINDOW_WIDTH_DEF + 1;
+       format->height = MT9T001_WINDOW_HEIGHT_DEF + 1;
+       format->field = V4L2_FIELD_NONE;
+       format->colorspace = V4L2_COLORSPACE_SRGB;
+
+       return 0;
+}
+
+static struct v4l2_subdev_video_ops mt9t001_subdev_video_ops = {
+       .s_stream = mt9t001_s_stream,
+};
+
+static struct v4l2_subdev_pad_ops mt9t001_subdev_pad_ops = {
+       .enum_mbus_code = mt9t001_enum_mbus_code,
+       .enum_frame_size = mt9t001_enum_frame_size,
+       .get_fmt = mt9t001_get_format,
+       .set_fmt = mt9t001_set_format,
+       .get_crop = mt9t001_get_crop,
+       .set_crop = mt9t001_set_crop,
+};
+
+static struct v4l2_subdev_ops mt9t001_subdev_ops = {
+       .video = &mt9t001_subdev_video_ops,
+       .pad = &mt9t001_subdev_pad_ops,
+};
+
+static struct v4l2_subdev_internal_ops mt9t001_subdev_internal_ops = {
+       .open = mt9t001_open,
+};
+
+static int mt9t001_video_probe(struct i2c_client *client)
+{
+       struct mt9t001_platform_data *pdata = client->dev.platform_data;
+       s32 data;
+       int ret;
+
+       dev_info(&client->dev, "Probing MT9T001 at address 0x%02x\n",
+                client->addr);
+
+       /* Reset the chip and stop data read out */
+       ret = mt9t001_write(client, MT9T001_RESET, 1);
+       if (ret < 0)
+               return ret;
+
+       ret = mt9t001_write(client, MT9T001_RESET, 0);
+       if (ret < 0)
+               return ret;
+
+       ret  = mt9t001_write(client, MT9T001_OUTPUT_CONTROL, 0);
+       if (ret < 0)
+               return ret;
+
+       /* Configure the pixel clock polarity */
+       if (pdata && pdata->clk_pol) {
+               ret  = mt9t001_write(client, MT9T001_PIXEL_CLOCK,
+                                    MT9T001_PIXEL_CLOCK_INVERT);
+               if (ret < 0)
+                       return ret;
+       }
+
+       /* Read and check the sensor version */
+       data = mt9t001_read(client, MT9T001_CHIP_VERSION);
+       if (data != MT9T001_CHIP_ID) {
+               dev_err(&client->dev, "MT9T001 not detected, wrong version "
+                       "0x%04x\n", data);
+               return -ENODEV;
+       }
+
+       dev_info(&client->dev, "MT9T001 detected at address 0x%02x\n",
+                client->addr);
+
+       return ret;
+}
+
+static int mt9t001_probe(struct i2c_client *client,
+                        const struct i2c_device_id *did)
+{
+       struct mt9t001 *mt9t001;
+       unsigned int i;
+       int 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;
+       }
+
+       ret = mt9t001_video_probe(client);
+       if (ret < 0)
+               return ret;
+
+       mt9t001 = kzalloc(sizeof(*mt9t001), GFP_KERNEL);
+       if (!mt9t001)
+               return -ENOMEM;
+
+       v4l2_ctrl_handler_init(&mt9t001->ctrls, ARRAY_SIZE(mt9t001_ctrls) +
+                                               ARRAY_SIZE(mt9t001_gains) + 2);
+
+       v4l2_ctrl_new_std(&mt9t001->ctrls, &mt9t001_ctrl_ops,
+                         V4L2_CID_EXPOSURE, MT9T001_SHUTTER_WIDTH_MIN,
+                         MT9T001_SHUTTER_WIDTH_MAX, 1,
+                         MT9T001_SHUTTER_WIDTH_DEF);
+       v4l2_ctrl_new_std(&mt9t001->ctrls, &mt9t001_ctrl_ops,
+                         V4L2_CID_BLACK_LEVEL, 1, 1, 1, 1);
+
+       for (i = 0; i < ARRAY_SIZE(mt9t001_ctrls); ++i)
+               v4l2_ctrl_new_custom(&mt9t001->ctrls, &mt9t001_ctrls[i], NULL);
+
+       for (i = 0; i < ARRAY_SIZE(mt9t001_gains); ++i)
+               mt9t001->gains[i] = v4l2_ctrl_new_custom(&mt9t001->ctrls,
+                       &mt9t001_gains[i], NULL);
+
+       v4l2_ctrl_cluster(ARRAY_SIZE(mt9t001_gains), mt9t001->gains);
+
+       mt9t001->subdev.ctrl_handler = &mt9t001->ctrls;
+
+       if (mt9t001->ctrls.error) {
+               printk(KERN_INFO "%s: control initialization error %d\n",
+                      __func__, mt9t001->ctrls.error);
+               ret = -EINVAL;
+               goto done;
+       }
+
+       mt9t001->crop.left = MT9T001_COLUMN_START_DEF;
+       mt9t001->crop.top = MT9T001_ROW_START_DEF;
+       mt9t001->crop.width = MT9T001_WINDOW_WIDTH_DEF + 1;
+       mt9t001->crop.height = MT9T001_WINDOW_HEIGHT_DEF + 1;
+
+       mt9t001->format.code = V4L2_MBUS_FMT_SGRBG10_1X10;
+       mt9t001->format.width = MT9T001_WINDOW_WIDTH_DEF + 1;
+       mt9t001->format.height = MT9T001_WINDOW_HEIGHT_DEF + 1;
+       mt9t001->format.field = V4L2_FIELD_NONE;
+       mt9t001->format.colorspace = V4L2_COLORSPACE_SRGB;
+
+       v4l2_i2c_subdev_init(&mt9t001->subdev, client, &mt9t001_subdev_ops);
+       mt9t001->subdev.internal_ops = &mt9t001_subdev_internal_ops;
+       mt9t001->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+
+       mt9t001->pad.flags = MEDIA_PAD_FL_SOURCE;
+       ret = media_entity_init(&mt9t001->subdev.entity, 1, &mt9t001->pad, 0);
+
+done:
+       if (ret < 0) {
+               v4l2_ctrl_handler_free(&mt9t001->ctrls);
+               media_entity_cleanup(&mt9t001->subdev.entity);
+               kfree(mt9t001);
+       }
+
+       return ret;
+}
+
+static int mt9t001_remove(struct i2c_client *client)
+{
+       struct v4l2_subdev *subdev = i2c_get_clientdata(client);
+       struct mt9t001 *mt9t001 = to_mt9t001(subdev);
+
+       v4l2_ctrl_handler_free(&mt9t001->ctrls);
+       v4l2_device_unregister_subdev(subdev);
+       media_entity_cleanup(&subdev->entity);
+       kfree(mt9t001);
+       return 0;
+}
+
+static const struct i2c_device_id mt9t001_id[] = {
+       { "mt9t001", 0 },
+       { }
+};
+MODULE_DEVICE_TABLE(i2c, mt9t001_id);
+
+static struct i2c_driver mt9t001_driver = {
+       .driver = {
+               .name = "mt9t001",
+       },
+       .probe          = mt9t001_probe,
+       .remove         = mt9t001_remove,
+       .id_table       = mt9t001_id,
+};
+
+static int __init mt9t001_init(void)
+{
+       return i2c_add_driver(&mt9t001_driver);
+}
+
+static void __exit mt9t001_exit(void)
+{
+       i2c_del_driver(&mt9t001_driver);
+}
+
+module_init(mt9t001_init);
+module_exit(mt9t001_exit);
+
+MODULE_DESCRIPTION("Aptina (Micron) MT9T001 Camera driver");
+MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
+MODULE_LICENSE("GPL");
diff --git a/include/media/mt9t001.h b/include/media/mt9t001.h
new file mode 100644 (file)
index 0000000..e839a78
--- /dev/null
@@ -0,0 +1,8 @@
+#ifndef _MEDIA_MT9T001_H
+#define _MEDIA_MT9T001_H
+
+struct mt9t001_platform_data {
+       unsigned int clk_pol:1;
+};
+
+#endif