V4L/DVB (10099): soc-camera: add support for MT9T031 CMOS camera sensor from Micron
Guennadi Liakhovetski [Mon, 29 Dec 2008 09:04:59 +0000 (06:04 -0300)]
This camera is rather similar to MT9M001, but also has a couple of
enhanced features, like pixel binning.

 create mode 100644 drivers/media/video/mt9t031.c

Signed-off-by: Guennadi Liakhovetski <lg@denx.de>
Acked-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/Kconfig
drivers/media/video/Makefile
drivers/media/video/mt9t031.c [new file with mode: 0644]
include/media/v4l2-chip-ident.h

index 9785eeb..19cf3b8 100644 (file)
@@ -741,6 +741,12 @@ config SOC_CAMERA_MT9M111
        help
          This driver supports MT9M111 and MT9M112 cameras from Micron
 
+config SOC_CAMERA_MT9T031
+       tristate "mt9t031 support"
+       depends on SOC_CAMERA && I2C
+       help
+         This driver supports MT9T031 cameras from Micron.
+
 config SOC_CAMERA_MT9V022
        tristate "mt9v022 support"
        depends on SOC_CAMERA && I2C
index 40c69af..1611c33 100644 (file)
@@ -137,6 +137,7 @@ obj-$(CONFIG_VIDEO_OMAP2)           += omap2cam.o
 obj-$(CONFIG_SOC_CAMERA)       += soc_camera.o
 obj-$(CONFIG_SOC_CAMERA_MT9M001)       += mt9m001.o
 obj-$(CONFIG_SOC_CAMERA_MT9M111)       += mt9m111.o
+obj-$(CONFIG_SOC_CAMERA_MT9T031)       += mt9t031.o
 obj-$(CONFIG_SOC_CAMERA_MT9V022)       += mt9v022.o
 obj-$(CONFIG_SOC_CAMERA_OV772X)                += ov772x.o
 obj-$(CONFIG_SOC_CAMERA_PLATFORM)      += soc_camera_platform.o
diff --git a/drivers/media/video/mt9t031.c b/drivers/media/video/mt9t031.c
new file mode 100644 (file)
index 0000000..1a9d539
--- /dev/null
@@ -0,0 +1,736 @@
+/*
+ * Driver for MT9T031 CMOS Image Sensor from Micron
+ *
+ * Copyright (C) 2008, Guennadi Liakhovetski, DENX Software Engineering <lg@denx.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/videodev2.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/log2.h>
+
+#include <media/v4l2-common.h>
+#include <media/v4l2-chip-ident.h>
+#include <media/soc_camera.h>
+
+/* mt9t031 i2c address 0x5d
+ * The platform has to define i2c_board_info
+ * and call i2c_register_board_info() */
+
+/* mt9t031 selected register addresses */
+#define MT9T031_CHIP_VERSION           0x00
+#define MT9T031_ROW_START              0x01
+#define MT9T031_COLUMN_START           0x02
+#define MT9T031_WINDOW_HEIGHT          0x03
+#define MT9T031_WINDOW_WIDTH           0x04
+#define MT9T031_HORIZONTAL_BLANKING    0x05
+#define MT9T031_VERTICAL_BLANKING      0x06
+#define MT9T031_OUTPUT_CONTROL         0x07
+#define MT9T031_SHUTTER_WIDTH_UPPER    0x08
+#define MT9T031_SHUTTER_WIDTH          0x09
+#define MT9T031_PIXEL_CLOCK_CONTROL    0x0a
+#define MT9T031_FRAME_RESTART          0x0b
+#define MT9T031_SHUTTER_DELAY          0x0c
+#define MT9T031_RESET                  0x0d
+#define MT9T031_READ_MODE_1            0x1e
+#define MT9T031_READ_MODE_2            0x20
+#define MT9T031_READ_MODE_3            0x21
+#define MT9T031_ROW_ADDRESS_MODE       0x22
+#define MT9T031_COLUMN_ADDRESS_MODE    0x23
+#define MT9T031_GLOBAL_GAIN            0x35
+#define MT9T031_CHIP_ENABLE            0xF8
+
+#define MT9T031_MAX_HEIGHT             1536
+#define MT9T031_MAX_WIDTH              2048
+#define MT9T031_MIN_HEIGHT             2
+#define MT9T031_MIN_WIDTH              2
+#define MT9T031_HORIZONTAL_BLANK       142
+#define MT9T031_VERTICAL_BLANK         25
+#define MT9T031_COLUMN_SKIP            32
+#define MT9T031_ROW_SKIP               20
+
+#define MT9T031_BUS_PARAM      (SOCAM_PCLK_SAMPLE_RISING |     \
+       SOCAM_PCLK_SAMPLE_FALLING | SOCAM_HSYNC_ACTIVE_HIGH |   \
+       SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_DATA_ACTIVE_HIGH |      \
+       SOCAM_MASTER | SOCAM_DATAWIDTH_10)
+
+static const struct soc_camera_data_format mt9t031_colour_formats[] = {
+       {
+               .name           = "Bayer (sRGB) 10 bit",
+               .depth          = 10,
+               .fourcc         = V4L2_PIX_FMT_SGRBG10,
+               .colorspace     = V4L2_COLORSPACE_SRGB,
+       }
+};
+
+struct mt9t031 {
+       struct i2c_client *client;
+       struct soc_camera_device icd;
+       int model;      /* V4L2_IDENT_MT9T031* codes from v4l2-chip-ident.h */
+       unsigned char autoexposure;
+       u16 xskip;
+       u16 yskip;
+};
+
+static int reg_read(struct soc_camera_device *icd, const u8 reg)
+{
+       struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd);
+       struct i2c_client *client = mt9t031->client;
+       s32 data = i2c_smbus_read_word_data(client, reg);
+       return data < 0 ? data : swab16(data);
+}
+
+static int reg_write(struct soc_camera_device *icd, const u8 reg,
+                    const u16 data)
+{
+       struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd);
+       return i2c_smbus_write_word_data(mt9t031->client, reg, swab16(data));
+}
+
+static int reg_set(struct soc_camera_device *icd, const u8 reg,
+                  const u16 data)
+{
+       int ret;
+
+       ret = reg_read(icd, reg);
+       if (ret < 0)
+               return ret;
+       return reg_write(icd, reg, ret | data);
+}
+
+static int reg_clear(struct soc_camera_device *icd, const u8 reg,
+                    const u16 data)
+{
+       int ret;
+
+       ret = reg_read(icd, reg);
+       if (ret < 0)
+               return ret;
+       return reg_write(icd, reg, ret & ~data);
+}
+
+static int set_shutter(struct soc_camera_device *icd, const u32 data)
+{
+       int ret;
+
+       ret = reg_write(icd, MT9T031_SHUTTER_WIDTH_UPPER, data >> 16);
+
+       if (ret >= 0)
+               ret = reg_write(icd, MT9T031_SHUTTER_WIDTH, data & 0xffff);
+
+       return ret;
+}
+
+static int get_shutter(struct soc_camera_device *icd, u32 *data)
+{
+       int ret;
+
+       ret = reg_read(icd, MT9T031_SHUTTER_WIDTH_UPPER);
+       *data = ret << 16;
+
+       if (ret >= 0)
+               ret = reg_read(icd, MT9T031_SHUTTER_WIDTH);
+       *data |= ret & 0xffff;
+
+       return ret < 0 ? ret : 0;
+}
+
+static int mt9t031_init(struct soc_camera_device *icd)
+{
+       int ret;
+
+       /* Disable chip output, synchronous option update */
+       dev_dbg(icd->vdev->parent, "%s\n", __func__);
+
+       ret = reg_write(icd, MT9T031_RESET, 1);
+       if (ret >= 0)
+               ret = reg_write(icd, MT9T031_RESET, 0);
+       if (ret >= 0)
+               ret = reg_clear(icd, MT9T031_OUTPUT_CONTROL, 3);
+
+       return ret >= 0 ? 0 : -EIO;
+}
+
+static int mt9t031_release(struct soc_camera_device *icd)
+{
+       /* Disable the chip */
+       reg_clear(icd, MT9T031_OUTPUT_CONTROL, 3);
+       return 0;
+}
+
+static int mt9t031_start_capture(struct soc_camera_device *icd)
+{
+       /* Switch to master "normal" mode */
+       if (reg_set(icd, MT9T031_OUTPUT_CONTROL, 3) < 0)
+               return -EIO;
+       return 0;
+}
+
+static int mt9t031_stop_capture(struct soc_camera_device *icd)
+{
+       /* Stop sensor readout */
+       if (reg_clear(icd, MT9T031_OUTPUT_CONTROL, 3) < 0)
+               return -EIO;
+       return 0;
+}
+
+static int mt9t031_set_bus_param(struct soc_camera_device *icd,
+                                unsigned long flags)
+{
+       /* The caller should have queried our parameters, check anyway */
+       if (flags & ~MT9T031_BUS_PARAM)
+               return -EINVAL;
+
+       if (flags & SOCAM_PCLK_SAMPLE_FALLING)
+               reg_set(icd, MT9T031_PIXEL_CLOCK_CONTROL, 0x8000);
+       else
+               reg_clear(icd, MT9T031_PIXEL_CLOCK_CONTROL, 0x8000);
+
+       return 0;
+}
+
+static unsigned long mt9t031_query_bus_param(struct soc_camera_device *icd)
+{
+       struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd);
+       struct soc_camera_link *icl = mt9t031->client->dev.platform_data;
+
+       return soc_camera_apply_sensor_flags(icl, MT9T031_BUS_PARAM);
+}
+
+static int mt9t031_set_fmt(struct soc_camera_device *icd,
+                          __u32 pixfmt, struct v4l2_rect *rect)
+{
+       struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd);
+       int ret;
+       const u16 hblank = MT9T031_HORIZONTAL_BLANK,
+               vblank = MT9T031_VERTICAL_BLANK;
+       u16 xbin, xskip = mt9t031->xskip, ybin, yskip = mt9t031->yskip,
+               width = rect->width * xskip, height = rect->height * yskip;
+
+       if (pixfmt) {
+               /* S_FMT - use binning and skipping for scaling, recalculate */
+               /* Is this more optimal than just a division? */
+               for (xskip = 8; xskip > 1; xskip--)
+                       if (rect->width * xskip <= icd->width_max)
+                               break;
+
+               for (yskip = 8; yskip > 1; yskip--)
+                       if (rect->height * yskip <= icd->height_max)
+                               break;
+
+               width = rect->width * xskip;
+               height = rect->height * yskip;
+
+               dev_dbg(&icd->dev, "xskip %u, width %u, yskip %u, height %u\n",
+                       xskip, width, yskip, height);
+       }
+
+       xbin = min(xskip, (u16)3);
+       ybin = min(yskip, (u16)3);
+
+       /* Make sure we don't exceed frame limits */
+       if (rect->left + width > icd->width_max)
+               rect->left = (icd->width_max - width) / 2;
+
+       if (rect->top + height > icd->height_max)
+               rect->top = (icd->height_max - height) / 2;
+
+       /* Could just do roundup(rect->left, [xy]bin); but this is cheaper */
+       switch (xbin) {
+       case 2:
+               rect->left = (rect->left + 1) & ~1;
+               break;
+       case 3:
+               rect->left = roundup(rect->left, 3);
+       }
+
+       switch (ybin) {
+       case 2:
+               rect->top = (rect->top + 1) & ~1;
+               break;
+       case 3:
+               rect->top = roundup(rect->top, 3);
+       }
+
+       /* Blanking and start values - default... */
+       ret = reg_write(icd, MT9T031_HORIZONTAL_BLANKING, hblank);
+       if (ret >= 0)
+               ret = reg_write(icd, MT9T031_VERTICAL_BLANKING, vblank);
+
+       if (pixfmt) {
+               /* Binning, skipping */
+               if (ret >= 0)
+                       ret = reg_write(icd, MT9T031_COLUMN_ADDRESS_MODE,
+                                       ((xbin - 1) << 4) | (xskip - 1));
+               if (ret >= 0)
+                       ret = reg_write(icd, MT9T031_ROW_ADDRESS_MODE,
+                                       ((ybin - 1) << 4) | (yskip - 1));
+       }
+       dev_dbg(&icd->dev, "new left %u, top %u\n", rect->left, rect->top);
+
+       /* The caller provides a supported format, as guaranteed by
+        * icd->try_fmt_cap(), soc_camera_s_crop() and soc_camera_cropcap() */
+       if (ret >= 0)
+               ret = reg_write(icd, MT9T031_COLUMN_START, rect->left);
+       if (ret >= 0)
+               ret = reg_write(icd, MT9T031_ROW_START, rect->top);
+       if (ret >= 0)
+               ret = reg_write(icd, MT9T031_WINDOW_WIDTH, width - 1);
+       if (ret >= 0)
+               ret = reg_write(icd, MT9T031_WINDOW_HEIGHT,
+                               height + icd->y_skip_top - 1);
+       if (ret >= 0 && mt9t031->autoexposure) {
+               ret = set_shutter(icd, height + icd->y_skip_top + vblank);
+               if (ret >= 0) {
+                       const u32 shutter_max = MT9T031_MAX_HEIGHT + vblank;
+                       const struct v4l2_queryctrl *qctrl =
+                               soc_camera_find_qctrl(icd->ops,
+                                                     V4L2_CID_EXPOSURE);
+                       icd->exposure = (shutter_max / 2 + (height +
+                                        icd->y_skip_top + vblank - 1) *
+                                        (qctrl->maximum - qctrl->minimum)) /
+                               shutter_max + qctrl->minimum;
+               }
+       }
+
+       if (!ret && pixfmt) {
+               mt9t031->xskip = xskip;
+               mt9t031->yskip = yskip;
+       }
+
+       return ret < 0 ? ret : 0;
+}
+
+static int mt9t031_try_fmt(struct soc_camera_device *icd,
+                          struct v4l2_format *f)
+{
+       struct v4l2_pix_format *pix = &f->fmt.pix;
+
+       if (pix->height < icd->height_min)
+               pix->height = icd->height_min;
+       if (pix->height > icd->height_max)
+               pix->height = icd->height_max;
+       if (pix->width < icd->width_min)
+               pix->width = icd->width_min;
+       if (pix->width > icd->width_max)
+               pix->width = icd->width_max;
+
+       pix->width &= ~0x01; /* has to be even */
+       pix->height &= ~0x01; /* has to be even */
+
+       return 0;
+}
+
+static int mt9t031_get_chip_id(struct soc_camera_device *icd,
+                              struct v4l2_chip_ident *id)
+{
+       struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd);
+
+       if (id->match_type != V4L2_CHIP_MATCH_I2C_ADDR)
+               return -EINVAL;
+
+       if (id->match_chip != mt9t031->client->addr)
+               return -ENODEV;
+
+       id->ident       = mt9t031->model;
+       id->revision    = 0;
+
+       return 0;
+}
+
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+static int mt9t031_get_register(struct soc_camera_device *icd,
+                               struct v4l2_register *reg)
+{
+       struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd);
+
+       if (reg->match_type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
+               return -EINVAL;
+
+       if (reg->match_chip != mt9t031->client->addr)
+               return -ENODEV;
+
+       reg->val = reg_read(icd, reg->reg);
+
+       if (reg->val > 0xffff)
+               return -EIO;
+
+       return 0;
+}
+
+static int mt9t031_set_register(struct soc_camera_device *icd,
+                               struct v4l2_register *reg)
+{
+       struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd);
+
+       if (reg->match_type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
+               return -EINVAL;
+
+       if (reg->match_chip != mt9t031->client->addr)
+               return -ENODEV;
+
+       if (reg_write(icd, reg->reg, reg->val) < 0)
+               return -EIO;
+
+       return 0;
+}
+#endif
+
+static const struct v4l2_queryctrl mt9t031_controls[] = {
+       {
+               .id             = V4L2_CID_VFLIP,
+               .type           = V4L2_CTRL_TYPE_BOOLEAN,
+               .name           = "Flip Vertically",
+               .minimum        = 0,
+               .maximum        = 1,
+               .step           = 1,
+               .default_value  = 0,
+       }, {
+               .id             = V4L2_CID_GAIN,
+               .type           = V4L2_CTRL_TYPE_INTEGER,
+               .name           = "Gain",
+               .minimum        = 0,
+               .maximum        = 127,
+               .step           = 1,
+               .default_value  = 64,
+               .flags          = V4L2_CTRL_FLAG_SLIDER,
+       }, {
+               .id             = V4L2_CID_EXPOSURE,
+               .type           = V4L2_CTRL_TYPE_INTEGER,
+               .name           = "Exposure",
+               .minimum        = 1,
+               .maximum        = 255,
+               .step           = 1,
+               .default_value  = 255,
+               .flags          = V4L2_CTRL_FLAG_SLIDER,
+       }, {
+               .id             = V4L2_CID_EXPOSURE_AUTO,
+               .type           = V4L2_CTRL_TYPE_BOOLEAN,
+               .name           = "Automatic Exposure",
+               .minimum        = 0,
+               .maximum        = 1,
+               .step           = 1,
+               .default_value  = 1,
+       }
+};
+
+static int mt9t031_video_probe(struct soc_camera_device *);
+static void mt9t031_video_remove(struct soc_camera_device *);
+static int mt9t031_get_control(struct soc_camera_device *, struct v4l2_control *);
+static int mt9t031_set_control(struct soc_camera_device *, struct v4l2_control *);
+
+static struct soc_camera_ops mt9t031_ops = {
+       .owner                  = THIS_MODULE,
+       .probe                  = mt9t031_video_probe,
+       .remove                 = mt9t031_video_remove,
+       .init                   = mt9t031_init,
+       .release                = mt9t031_release,
+       .start_capture          = mt9t031_start_capture,
+       .stop_capture           = mt9t031_stop_capture,
+       .set_fmt                = mt9t031_set_fmt,
+       .try_fmt                = mt9t031_try_fmt,
+       .set_bus_param          = mt9t031_set_bus_param,
+       .query_bus_param        = mt9t031_query_bus_param,
+       .controls               = mt9t031_controls,
+       .num_controls           = ARRAY_SIZE(mt9t031_controls),
+       .get_control            = mt9t031_get_control,
+       .set_control            = mt9t031_set_control,
+       .get_chip_id            = mt9t031_get_chip_id,
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+       .get_register           = mt9t031_get_register,
+       .set_register           = mt9t031_set_register,
+#endif
+};
+
+static int mt9t031_get_control(struct soc_camera_device *icd, struct v4l2_control *ctrl)
+{
+       struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd);
+       int data;
+
+       switch (ctrl->id) {
+       case V4L2_CID_VFLIP:
+               data = reg_read(icd, MT9T031_READ_MODE_2);
+               if (data < 0)
+                       return -EIO;
+               ctrl->value = !!(data & 0x8000);
+               break;
+       case V4L2_CID_HFLIP:
+               data = reg_read(icd, MT9T031_READ_MODE_2);
+               if (data < 0)
+                       return -EIO;
+               ctrl->value = !!(data & 0x4000);
+               break;
+       case V4L2_CID_EXPOSURE_AUTO:
+               ctrl->value = mt9t031->autoexposure;
+               break;
+       }
+       return 0;
+}
+
+static int mt9t031_set_control(struct soc_camera_device *icd, struct v4l2_control *ctrl)
+{
+       struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd);
+       const struct v4l2_queryctrl *qctrl;
+       int data;
+
+       qctrl = soc_camera_find_qctrl(&mt9t031_ops, ctrl->id);
+
+       if (!qctrl)
+               return -EINVAL;
+
+       switch (ctrl->id) {
+       case V4L2_CID_VFLIP:
+               if (ctrl->value)
+                       data = reg_set(icd, MT9T031_READ_MODE_2, 0x8000);
+               else
+                       data = reg_clear(icd, MT9T031_READ_MODE_2, 0x8000);
+               if (data < 0)
+                       return -EIO;
+               break;
+       case V4L2_CID_HFLIP:
+               if (ctrl->value)
+                       data = reg_set(icd, MT9T031_READ_MODE_2, 0x4000);
+               else
+                       data = reg_clear(icd, MT9T031_READ_MODE_2, 0x4000);
+               if (data < 0)
+                       return -EIO;
+               break;
+       case V4L2_CID_GAIN:
+               if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum)
+                       return -EINVAL;
+               /* See Datasheet Table 7, Gain settings. */
+               if (ctrl->value <= qctrl->default_value) {
+                       /* Pack it into 0..1 step 0.125, register values 0..8 */
+                       unsigned long range = qctrl->default_value - qctrl->minimum;
+                       data = ((ctrl->value - qctrl->minimum) * 8 + range / 2) / range;
+
+                       dev_dbg(&icd->dev, "Setting gain %d\n", data);
+                       data = reg_write(icd, MT9T031_GLOBAL_GAIN, data);
+                       if (data < 0)
+                               return -EIO;
+               } else {
+                       /* Pack it into 1.125..15 variable step, register values 9..67 */
+                       /* We assume qctrl->maximum - qctrl->default_value - 1 > 0 */
+                       unsigned long range = qctrl->maximum - qctrl->default_value - 1;
+                       unsigned long gain = ((ctrl->value - qctrl->default_value - 1) *
+                                              111 + range / 2) / range + 9;
+
+                       if (gain <= 32)
+                               data = gain;
+                       else if (gain <= 64)
+                               data = ((gain - 32) * 16 + 16) / 32 + 80;
+                       else
+                               data = ((gain - 64) * 7 + 28) / 56 + 96;
+
+                       dev_dbg(&icd->dev, "Setting gain from %d to %d\n",
+                                reg_read(icd, MT9T031_GLOBAL_GAIN), data);
+                       data = reg_write(icd, MT9T031_GLOBAL_GAIN, data);
+                       if (data < 0)
+                               return -EIO;
+               }
+
+               /* Success */
+               icd->gain = ctrl->value;
+               break;
+       case V4L2_CID_EXPOSURE:
+               /* mt9t031 has maximum == default */
+               if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum)
+                       return -EINVAL;
+               else {
+                       const unsigned long range = qctrl->maximum - qctrl->minimum;
+                       const u32 shutter = ((ctrl->value - qctrl->minimum) * 1048 +
+                                            range / 2) / range + 1;
+                       u32 old;
+
+                       get_shutter(icd, &old);
+                       dev_dbg(&icd->dev, "Setting shutter width from %u to %u\n",
+                               old, shutter);
+                       if (set_shutter(icd, shutter) < 0)
+                               return -EIO;
+                       icd->exposure = ctrl->value;
+                       mt9t031->autoexposure = 0;
+               }
+               break;
+       case V4L2_CID_EXPOSURE_AUTO:
+               if (ctrl->value) {
+                       const u16 vblank = MT9T031_VERTICAL_BLANK;
+                       const u32 shutter_max = MT9T031_MAX_HEIGHT + vblank;
+                       if (set_shutter(icd, icd->height +
+                                       icd->y_skip_top + vblank) < 0)
+                               return -EIO;
+                       qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_EXPOSURE);
+                       icd->exposure = (shutter_max / 2 + (icd->height +
+                                        icd->y_skip_top + vblank - 1) *
+                                        (qctrl->maximum - qctrl->minimum)) /
+                               shutter_max + qctrl->minimum;
+                       mt9t031->autoexposure = 1;
+               } else
+                       mt9t031->autoexposure = 0;
+               break;
+       }
+       return 0;
+}
+
+/* Interface active, can use i2c. If it fails, it can indeed mean, that
+ * this wasn't our capture interface, so, we wait for the right one */
+static int mt9t031_video_probe(struct soc_camera_device *icd)
+{
+       struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd);
+       s32 data;
+       int ret;
+
+       /* We must have a parent by now. And it cannot be a wrong one.
+        * So this entire test is completely redundant. */
+       if (!icd->dev.parent ||
+           to_soc_camera_host(icd->dev.parent)->nr != icd->iface)
+               return -ENODEV;
+
+       /* Enable the chip */
+       data = reg_write(icd, MT9T031_CHIP_ENABLE, 1);
+       dev_dbg(&icd->dev, "write: %d\n", data);
+
+       /* Read out the chip version register */
+       data = reg_read(icd, MT9T031_CHIP_VERSION);
+
+       switch (data) {
+       case 0x1621:
+               mt9t031->model = V4L2_IDENT_MT9T031;
+               icd->formats = mt9t031_colour_formats;
+               icd->num_formats = ARRAY_SIZE(mt9t031_colour_formats);
+               break;
+       default:
+               ret = -ENODEV;
+               dev_err(&icd->dev,
+                       "No MT9T031 chip detected, register read %x\n", data);
+               goto ei2c;
+       }
+
+       dev_info(&icd->dev, "Detected a MT9T031 chip ID %x\n", data);
+
+       /* Now that we know the model, we can start video */
+       ret = soc_camera_video_start(icd);
+       if (ret)
+               goto evstart;
+
+       return 0;
+
+evstart:
+ei2c:
+       return ret;
+}
+
+static void mt9t031_video_remove(struct soc_camera_device *icd)
+{
+       struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd);
+
+       dev_dbg(&icd->dev, "Video %x removed: %p, %p\n", mt9t031->client->addr,
+               icd->dev.parent, icd->vdev);
+       soc_camera_video_stop(icd);
+}
+
+static int mt9t031_probe(struct i2c_client *client,
+                        const struct i2c_device_id *did)
+{
+       struct mt9t031 *mt9t031;
+       struct soc_camera_device *icd;
+       struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
+       struct soc_camera_link *icl = client->dev.platform_data;
+       int ret;
+
+       if (!icl) {
+               dev_err(&client->dev, "MT9T031 driver needs platform data\n");
+               return -EINVAL;
+       }
+
+       if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
+               dev_warn(&adapter->dev,
+                        "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
+               return -EIO;
+       }
+
+       mt9t031 = kzalloc(sizeof(struct mt9t031), GFP_KERNEL);
+       if (!mt9t031)
+               return -ENOMEM;
+
+       mt9t031->client = client;
+       i2c_set_clientdata(client, mt9t031);
+
+       /* Second stage probe - when a capture adapter is there */
+       icd = &mt9t031->icd;
+       icd->ops        = &mt9t031_ops;
+       icd->control    = &client->dev;
+       icd->x_min      = MT9T031_COLUMN_SKIP;
+       icd->y_min      = MT9T031_ROW_SKIP;
+       icd->x_current  = icd->x_min;
+       icd->y_current  = icd->y_min;
+       icd->width_min  = MT9T031_MIN_WIDTH;
+       icd->width_max  = MT9T031_MAX_WIDTH;
+       icd->height_min = MT9T031_MIN_HEIGHT;
+       icd->height_max = MT9T031_MAX_HEIGHT;
+       icd->y_skip_top = 0;
+       icd->iface      = icl->bus_id;
+       /* Simulated autoexposure. If enabled, we calculate shutter width
+        * ourselves in the driver based on vertical blanking and frame width */
+       mt9t031->autoexposure = 1;
+
+       mt9t031->xskip = 1;
+       mt9t031->yskip = 1;
+
+       ret = soc_camera_device_register(icd);
+       if (ret)
+               goto eisdr;
+
+       return 0;
+
+eisdr:
+       i2c_set_clientdata(client, NULL);
+       kfree(mt9t031);
+       return ret;
+}
+
+static int mt9t031_remove(struct i2c_client *client)
+{
+       struct mt9t031 *mt9t031 = i2c_get_clientdata(client);
+
+       soc_camera_device_unregister(&mt9t031->icd);
+       i2c_set_clientdata(client, NULL);
+       kfree(mt9t031);
+
+       return 0;
+}
+
+static const struct i2c_device_id mt9t031_id[] = {
+       { "mt9t031", 0 },
+       { }
+};
+MODULE_DEVICE_TABLE(i2c, mt9t031_id);
+
+static struct i2c_driver mt9t031_i2c_driver = {
+       .driver = {
+               .name = "mt9t031",
+       },
+       .probe          = mt9t031_probe,
+       .remove         = mt9t031_remove,
+       .id_table       = mt9t031_id,
+};
+
+static int __init mt9t031_mod_init(void)
+{
+       return i2c_add_driver(&mt9t031_i2c_driver);
+}
+
+static void __exit mt9t031_mod_exit(void)
+{
+       i2c_del_driver(&mt9t031_i2c_driver);
+}
+
+module_init(mt9t031_mod_init);
+module_exit(mt9t031_mod_exit);
+
+MODULE_DESCRIPTION("Micron MT9T031 Camera driver");
+MODULE_AUTHOR("Guennadi Liakhovetski <lg@denx.de>");
+MODULE_LICENSE("GPL v2");
index f9d42ad..43dbb65 100644 (file)
@@ -177,6 +177,7 @@ enum {
        V4L2_IDENT_MT9M112              = 45008,
        V4L2_IDENT_MT9V022IX7ATC        = 45010, /* No way to detect "normal" I77ATx */
        V4L2_IDENT_MT9V022IX7ATM        = 45015, /* and "lead free" IA7ATx chips */
+       V4L2_IDENT_MT9T031              = 45020,
 };
 
 #endif