V4L/DVB (7174): Add support for the MT9V022 camera

This driver supports Micron MT9V022 colour camera.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@pengutronix.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 804 insertions, 0 deletions

diff --git a/drivers/media/video/mt9v022.c b/drivers/media/video/mt9v022.c
new file mode 100644
index 000000000000..9b406e41902a
--- /dev/null
+++ b/drivers/media/video/mt9v022.c
@@ -0,0 +1,804 @@
+/*
+ * Driver for MT9V022 CMOS Image Sensor from Micron
+ *
+ * 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/videodev2.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/delay.h>
+#include <linux/log2.h>
+
+#include <media/v4l2-common.h>
+#include <media/v4l2-chip-ident.h>
+#include <media/soc_camera.h>
+
+#include <asm/gpio.h>
+
+/* mt9v022 i2c address 0x48, 0x4c, 0x58, 0x5c
+ * The platform has to define i2c_board_info
+ * and call i2c_register_board_info() */
+
+static char *sensor_type;
+module_param(sensor_type, charp, S_IRUGO);
+MODULE_PARM_DESC(sensor_type, "Sensor type: \"colour\" or \"monochrome\"\n");
+
+/* mt9v022 selected register addresses */
+#define MT9V022_CHIP_VERSION            0x00
+#define MT9V022_COLUMN_START            0x01
+#define MT9V022_ROW_START               0x02
+#define MT9V022_WINDOW_HEIGHT           0x03
+#define MT9V022_WINDOW_WIDTH            0x04
+#define MT9V022_HORIZONTAL_BLANKING     0x05
+#define MT9V022_VERTICAL_BLANKING       0x06
+#define MT9V022_CHIP_CONTROL            0x07
+#define MT9V022_SHUTTER_WIDTH1          0x08
+#define MT9V022_SHUTTER_WIDTH2          0x09
+#define MT9V022_SHUTTER_WIDTH_CTRL      0x0a
+#define MT9V022_TOTAL_SHUTTER_WIDTH     0x0b
+#define MT9V022_RESET                   0x0c
+#define MT9V022_READ_MODE               0x0d
+#define MT9V022_MONITOR_MODE            0x0e
+#define MT9V022_PIXEL_OPERATION_MODE    0x0f
+#define MT9V022_LED_OUT_CONTROL         0x1b
+#define MT9V022_ADC_MODE_CONTROL        0x1c
+#define MT9V022_ANALOG_GAIN             0x34
+#define MT9V022_BLACK_LEVEL_CALIB_CTRL  0x47
+#define MT9V022_PIXCLK_FV_LV            0x74
+#define MT9V022_DIGITAL_TEST_PATTERN    0x7f
+#define MT9V022_AEC_AGC_ENABLE          0xAF
+#define MT9V022_MAX_TOTAL_SHUTTER_WIDTH 0xBD
+
+/* Progressive scan, master, defaults */
+#define MT9V022_CHIP_CONTROL_DEFAULT    0x188
+
+static const struct soc_camera_data_format mt9v022_formats[] = {
+        {
+                .name           = "RGB Bayer (sRGB)",
+                .depth          = 8,
+                .fourcc         = V4L2_PIX_FMT_SBGGR8,
+                .colorspace     = V4L2_COLORSPACE_SRGB,
+        }, {
+                .name           = "RGB Bayer (sRGB)",
+                .depth          = 10,
+                .fourcc         = V4L2_PIX_FMT_SBGGR16,
+                .colorspace     = V4L2_COLORSPACE_SRGB,
+        }, {
+                .name           = "Monochrome 10 bit",
+                .depth          = 10,
+                .fourcc         = V4L2_PIX_FMT_Y16,
+        }, {
+                .name           = "Monochrome 8 bit",
+                .depth          = 8,
+                .fourcc         = V4L2_PIX_FMT_GREY,
+        },
+};
+
+struct mt9v022 {
+        struct i2c_client *client;
+        struct soc_camera_device icd;
+        int model;      /* V4L2_IDENT_MT9M001* codes from v4l2-chip-ident.h */
+        int switch_gpio;
+        u16 chip_control;
+        unsigned char datawidth;
+};
+
+static int reg_read(struct soc_camera_device *icd, const u8 reg)
+{
+        struct mt9v022 *mt9v022 = container_of(icd, struct mt9v022, icd);
+        struct i2c_client *client = mt9v022->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 mt9v022 *mt9v022 = container_of(icd, struct mt9v022, icd);
+        return i2c_smbus_write_word_data(mt9v022->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 mt9v022_init(struct soc_camera_device *icd)
+{
+        struct mt9v022 *mt9v022 = container_of(icd, struct mt9v022, icd);
+        int ret;
+
+        /* Almost the default mode: master, parallel, simultaneous, and an
+         * undocumented bit 0x200, which is present in table 7, but not in 8,
+         * plus snapshot mode to disable scan for now */
+        mt9v022->chip_control |= 0x10;
+        ret = reg_write(icd, MT9V022_CHIP_CONTROL, mt9v022->chip_control);
+        if (ret >= 0)
+                reg_write(icd, MT9V022_READ_MODE, 0x300);
+
+        /* All defaults */
+        if (ret >= 0)
+                /* AEC, AGC on */
+                ret = reg_set(icd, MT9V022_AEC_AGC_ENABLE, 0x3);
+        if (ret >= 0)
+                ret = reg_write(icd, MT9V022_MAX_TOTAL_SHUTTER_WIDTH, 480);
+        if (ret >= 0)
+                /* default - auto */
+                ret = reg_clear(icd, MT9V022_BLACK_LEVEL_CALIB_CTRL, 1);
+        if (ret >= 0)
+                ret = reg_write(icd, MT9V022_DIGITAL_TEST_PATTERN, 0);
+
+        return ret >= 0 ? 0 : -EIO;
+}
+
+static int mt9v022_release(struct soc_camera_device *icd)
+{
+        /* Nothing? */
+        return 0;
+}
+
+static int mt9v022_start_capture(struct soc_camera_device *icd)
+{
+        struct mt9v022 *mt9v022 = container_of(icd, struct mt9v022, icd);
+        /* Switch to master "normal" mode */
+        mt9v022->chip_control &= ~0x10;
+        if (reg_write(icd, MT9V022_CHIP_CONTROL,
+                      mt9v022->chip_control) < 0)
+                return -EIO;
+        return 0;
+}
+
+static int mt9v022_stop_capture(struct soc_camera_device *icd)
+{
+        struct mt9v022 *mt9v022 = container_of(icd, struct mt9v022, icd);
+        /* Switch to snapshot mode */
+        mt9v022->chip_control |= 0x10;
+        if (reg_write(icd, MT9V022_CHIP_CONTROL,
+                      mt9v022->chip_control) < 0)
+                return -EIO;
+        return 0;
+}
+
+static int bus_switch_request(struct mt9v022 *mt9v022, struct soc_camera_link *icl)
+{
+#ifdef CONFIG_MT9V022_PCA9536_SWITCH
+        int ret;
+        unsigned int gpio = icl->gpio;
+
+        if (gpio != NO_GPIO) {
+                /* We have a data bus switch. */
+                ret = gpio_request(gpio, "mt9v022");
+                if (ret < 0) {
+                        dev_err(&mt9v022->client->dev, "Cannot get GPIO %u\n", gpio);
+                        return ret;
+                }
+
+                ret = gpio_direction_output(gpio, 0);
+                if (ret < 0) {
+                        dev_err(&mt9v022->client->dev,
+                                "Cannot set GPIO %u to output\n", gpio);
+                        gpio_free(gpio);
+                        return ret;
+                }
+        }
+
+        mt9v022->switch_gpio = gpio;
+#else
+        mt9v022->switch_gpio = NO_GPIO;
+#endif
+        return 0;
+}
+
+static void bus_switch_release(struct mt9v022 *mt9v022)
+{
+#ifdef CONFIG_MT9V022_PCA9536_SWITCH
+        if (mt9v022->switch_gpio != NO_GPIO)
+                gpio_free(mt9v022->switch_gpio);
+#endif
+}
+
+static int bus_switch_act(struct mt9v022 *mt9v022, int go8bit)
+{
+#ifdef CONFIG_MT9V022_PCA9536_SWITCH
+        if (mt9v022->switch_gpio == NO_GPIO)
+                return -ENODEV;
+
+        gpio_set_value_cansleep(mt9v022->switch_gpio, go8bit);
+        return 0;
+#else
+        return -ENODEV;
+#endif
+}
+
+static int mt9v022_set_capture_format(struct soc_camera_device *icd,
+                __u32 pixfmt, struct v4l2_rect *rect, unsigned int flags)
+{
+        struct mt9v022 *mt9v022 = container_of(icd, struct mt9v022, icd);
+        unsigned int width_flag = flags & (IS_DATAWIDTH_10 | IS_DATAWIDTH_9 |
+                                           IS_DATAWIDTH_8);
+        u16 pixclk = 0;
+        int ret;
+
+        /* Only one width bit may be set */
+        if (!is_power_of_2(width_flag))
+                return -EINVAL;
+
+        /* The caller provides a supported format, as verified per call to
+         * icd->try_fmt_cap(), datawidth is from our supported format list */
+        switch (pixfmt) {
+        case V4L2_PIX_FMT_GREY:
+        case V4L2_PIX_FMT_Y16:
+                if (mt9v022->model != V4L2_IDENT_MT9V022IX7ATM)
+                        return -EINVAL;
+                break;
+        case V4L2_PIX_FMT_SBGGR8:
+        case V4L2_PIX_FMT_SBGGR16:
+                if (mt9v022->model != V4L2_IDENT_MT9V022IX7ATC)
+                        return -EINVAL;
+                break;
+        case 0:
+                /* No format change, only geometry */
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        /* Like in example app. Contradicts the datasheet though */
+        ret = reg_read(icd, MT9V022_AEC_AGC_ENABLE);
+        if (ret >= 0) {
+                if (ret & 1) /* Autoexposure */
+                        ret = reg_write(icd, MT9V022_MAX_TOTAL_SHUTTER_WIDTH,
+                                        rect->height + icd->y_skip_top + 43);
+                else
+                        ret = reg_write(icd, MT9V022_TOTAL_SHUTTER_WIDTH,
+                                        rect->height + icd->y_skip_top + 43);
+        }
+        /* Setup frame format: defaults apart from width and height */
+        if (ret >= 0)
+                ret = reg_write(icd, MT9V022_COLUMN_START, rect->left);
+        if (ret >= 0)
+                ret = reg_write(icd, MT9V022_ROW_START, rect->top);
+        if (ret >= 0)
+                /* Default 94, Phytec driver says:
+                 * "width + horizontal blank >= 660" */
+                ret = reg_write(icd, MT9V022_HORIZONTAL_BLANKING,
+                                rect->width > 660 - 43 ? 43 :
+                                660 - rect->width);
+        if (ret >= 0)
+                ret = reg_write(icd, MT9V022_VERTICAL_BLANKING, 45);
+        if (ret >= 0)
+                ret = reg_write(icd, MT9V022_WINDOW_WIDTH, rect->width);
+        if (ret >= 0)
+                ret = reg_write(icd, MT9V022_WINDOW_HEIGHT,
+                                rect->height + icd->y_skip_top);
+
+        if (ret < 0)
+                return ret;
+
+        dev_dbg(&icd->dev, "Frame %ux%u pixel\n", rect->width, rect->height);
+
+        if ((mt9v022->datawidth != 10 && (width_flag == IS_DATAWIDTH_10)) ||
+            (mt9v022->datawidth != 9  && (width_flag == IS_DATAWIDTH_9)) ||
+            (mt9v022->datawidth != 8  && (width_flag == IS_DATAWIDTH_8))) {
+                /* data width switch requested */
+                if (mt9v022->switch_gpio == NO_GPIO)
+                        return -EINVAL;
+
+                /* Well, we actually only can do 10 or 8 bits... */
+                if (width_flag == IS_DATAWIDTH_9)
+                        return -EINVAL;
+
+                ret = bus_switch_act(mt9v022,
+                                     width_flag == IS_DATAWIDTH_8);
+                if (ret < 0)
+                        return ret;
+
+                mt9v022->datawidth = width_flag == IS_DATAWIDTH_8 ? 8 : 10;
+        }
+
+        if (flags & IS_PCLK_SAMPLE_RISING)
+                pixclk |= 0x10;
+
+        if (!(flags & IS_HSYNC_ACTIVE_HIGH))
+                pixclk |= 0x1;
+
+        if (!(flags & IS_VSYNC_ACTIVE_HIGH))
+                pixclk |= 0x2;
+
+        ret = reg_write(icd, MT9V022_PIXCLK_FV_LV, pixclk);
+        if (ret < 0)
+                return ret;
+
+        if (!(flags & IS_MASTER))
+                mt9v022->chip_control &= ~0x8;
+
+        ret = reg_write(icd, MT9V022_CHIP_CONTROL, mt9v022->chip_control);
+        if (ret < 0)
+                return ret;
+
+        dev_dbg(&icd->dev, "Calculated pixclk 0x%x, chip control 0x%x\n",
+                pixclk, mt9v022->chip_control);
+
+        return 0;
+}
+
+static int mt9v022_try_fmt_cap(struct soc_camera_device *icd,
+                               struct v4l2_format *f)
+{
+        if (f->fmt.pix.height < 32 + icd->y_skip_top)
+                f->fmt.pix.height = 32 + icd->y_skip_top;
+        if (f->fmt.pix.height > 480 + icd->y_skip_top)
+                f->fmt.pix.height = 480 + icd->y_skip_top;
+        if (f->fmt.pix.width < 48)
+                f->fmt.pix.width = 48;
+        if (f->fmt.pix.width > 752)
+                f->fmt.pix.width = 752;
+        f->fmt.pix.width &= ~0x03; /* ? */
+
+        return 0;
+}
+
+static int mt9v022_get_chip_id(struct soc_camera_device *icd,
+                               struct v4l2_chip_ident *id)
+{
+        struct mt9v022 *mt9v022 = container_of(icd, struct mt9v022, icd);
+
+        if (id->match_type != V4L2_CHIP_MATCH_I2C_ADDR)
+                return -EINVAL;
+
+        if (id->match_chip != mt9v022->client->addr)
+                return -ENODEV;
+
+        id->ident       = mt9v022->model;
+        id->revision    = 0;
+
+        return 0;
+}
+
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+static int mt9v022_get_register(struct soc_camera_device *icd,
+                                struct v4l2_register *reg)
+{
+        struct mt9v022 *mt9v022 = container_of(icd, struct mt9v022, icd);
+
+        if (reg->match_type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
+                return -EINVAL;
+
+        if (reg->match_chip != mt9v022->client->addr)
+                return -ENODEV;
+
+        reg->val = reg_read(icd, reg->reg);
+
+        if (reg->val > 0xffff)
+                return -EIO;
+
+        return 0;
+}
+
+static int mt9v022_set_register(struct soc_camera_device *icd,
+                                struct v4l2_register *reg)
+{
+        struct mt9v022 *mt9v022 = container_of(icd, struct mt9v022, icd);
+
+        if (reg->match_type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
+                return -EINVAL;
+
+        if (reg->match_chip != mt9v022->client->addr)
+                return -ENODEV;
+
+        if (reg_write(icd, reg->reg, reg->val) < 0)
+                return -EIO;
+
+        return 0;
+}
+#endif
+
+static unsigned int mt9v022_get_datawidth(struct soc_camera_device *icd)
+{
+        struct mt9v022 *mt9v022 = container_of(icd, struct mt9v022, icd);
+        return mt9v022->datawidth;
+}
+
+const struct v4l2_queryctrl mt9v022_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_HFLIP,
+                .type           = V4L2_CTRL_TYPE_BOOLEAN,
+                .name           = "Flip Horizontally",
+                .minimum        = 0,
+                .maximum        = 1,
+                .step           = 1,
+                .default_value  = 0,
+        }, {
+                .id             = V4L2_CID_GAIN,
+                .type           = V4L2_CTRL_TYPE_INTEGER,
+                .name           = "Analog Gain",
+                .minimum        = 64,
+                .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_AUTOGAIN,
+                .type           = V4L2_CTRL_TYPE_BOOLEAN,
+                .name           = "Automatic Gain",
+                .minimum        = 0,
+                .maximum        = 1,
+                .step           = 1,
+                .default_value  = 1,
+        }, {
+                .id             = V4L2_CID_EXPOSURE_AUTO,
+                .type           = V4L2_CTRL_TYPE_BOOLEAN,
+                .name           = "Automatic Exposure",
+                .minimum        = 0,
+                .maximum        = 1,
+                .step           = 1,
+                .default_value  = 1,
+        }
+};
+
+static int mt9v022_get_control(struct soc_camera_device *icd,
+                               struct v4l2_control *ctrl);
+static int mt9v022_set_control(struct soc_camera_device *icd,
+                               struct v4l2_control *ctrl);
+
+static struct soc_camera_ops mt9v022_ops = {
+        .owner                  = THIS_MODULE,
+        .init                   = mt9v022_init,
+        .release                = mt9v022_release,
+        .start_capture          = mt9v022_start_capture,
+        .stop_capture           = mt9v022_stop_capture,
+        .set_capture_format     = mt9v022_set_capture_format,
+        .try_fmt_cap            = mt9v022_try_fmt_cap,
+        .formats                = mt9v022_formats,
+        .num_formats            = ARRAY_SIZE(mt9v022_formats),
+        .get_datawidth          = mt9v022_get_datawidth,
+        .controls               = mt9v022_controls,
+        .num_controls           = ARRAY_SIZE(mt9v022_controls),
+        .get_control            = mt9v022_get_control,
+        .set_control            = mt9v022_set_control,
+        .get_chip_id            = mt9v022_get_chip_id,
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+        .get_register           = mt9v022_get_register,
+        .set_register           = mt9v022_set_register,
+#endif
+};
+
+static int mt9v022_get_control(struct soc_camera_device *icd,
+                               struct v4l2_control *ctrl)
+{
+        int data;
+
+        switch (ctrl->id) {
+        case V4L2_CID_VFLIP:
+                data = reg_read(icd, MT9V022_READ_MODE);
+                if (data < 0)
+                        return -EIO;
+                ctrl->value = !!(data & 0x10);
+                break;
+        case V4L2_CID_HFLIP:
+                data = reg_read(icd, MT9V022_READ_MODE);
+                if (data < 0)
+                        return -EIO;
+                ctrl->value = !!(data & 0x20);
+                break;
+        case V4L2_CID_EXPOSURE_AUTO:
+                data = reg_read(icd, MT9V022_AEC_AGC_ENABLE);
+                if (data < 0)
+                        return -EIO;
+                ctrl->value = !!(data & 0x1);
+                break;
+        case V4L2_CID_AUTOGAIN:
+                data = reg_read(icd, MT9V022_AEC_AGC_ENABLE);
+                if (data < 0)
+                        return -EIO;
+                ctrl->value = !!(data & 0x2);
+                break;
+        }
+        return 0;
+}
+
+static int mt9v022_set_control(struct soc_camera_device *icd,
+                               struct v4l2_control *ctrl)
+{
+        int data;
+        const struct v4l2_queryctrl *qctrl;
+
+        qctrl = soc_camera_find_qctrl(&mt9v022_ops, ctrl->id);
+
+        if (!qctrl)
+                return -EINVAL;
+
+        switch (ctrl->id) {
+        case V4L2_CID_VFLIP:
+                if (ctrl->value)
+                        data = reg_set(icd, MT9V022_READ_MODE, 0x10);
+                else
+                        data = reg_clear(icd, MT9V022_READ_MODE, 0x10);
+                if (data < 0)
+                        return -EIO;
+                break;
+        case V4L2_CID_HFLIP:
+                if (ctrl->value)
+                        data = reg_set(icd, MT9V022_READ_MODE, 0x20);
+                else
+                        data = reg_clear(icd, MT9V022_READ_MODE, 0x20);
+                if (data < 0)
+                        return -EIO;
+                break;
+        case V4L2_CID_GAIN:
+                /* mt9v022 has minimum == default */
+                if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum)
+                        return -EINVAL;
+                else {
+                        unsigned long range = qctrl->maximum - qctrl->minimum;
+                        /* Datasheet says 16 to 64. autogain only works properly
+                         * after setting gain to maximum 14. Larger values
+                         * produce "white fly" noise effect. On the whole,
+                         * manually setting analog gain does no good. */
+                        unsigned long gain = ((ctrl->value - qctrl->minimum) *
+                                              10 + range / 2) / range + 4;
+                        if (gain >= 32)
+                                gain &= ~1;
+                        /* The user wants to set gain manually, hope, she
+                         * knows, what she's doing... Switch AGC off. */
+
+                        if (reg_clear(icd, MT9V022_AEC_AGC_ENABLE, 0x2) < 0)
+                                return -EIO;
+
+                        dev_info(&icd->dev, "Setting gain from %d to %lu\n",
+                                 reg_read(icd, MT9V022_ANALOG_GAIN), gain);
+                        if (reg_write(icd, MT9V022_ANALOG_GAIN, gain) < 0)
+                                return -EIO;
+                        icd->gain = ctrl->value;
+                }
+                break;
+        case V4L2_CID_EXPOSURE:
+                /* mt9v022 has maximum == default */
+                if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum)
+                        return -EINVAL;
+                else {
+                        unsigned long range = qctrl->maximum - qctrl->minimum;
+                        unsigned long shutter = ((ctrl->value - qctrl->minimum) *
+                                                 479 + range / 2) / range + 1;
+                        /* The user wants to set shutter width manually, hope,
+                         * she knows, what she's doing... Switch AEC off. */
+
+                        if (reg_clear(icd, MT9V022_AEC_AGC_ENABLE, 0x1) < 0)
+                                return -EIO;
+
+                        dev_dbg(&icd->dev, "Shutter width from %d to %lu\n",
+                                reg_read(icd, MT9V022_TOTAL_SHUTTER_WIDTH),
+                                shutter);
+                        if (reg_write(icd, MT9V022_TOTAL_SHUTTER_WIDTH,
+                                      shutter) < 0)
+                                return -EIO;
+                        icd->exposure = ctrl->value;
+                }
+                break;
+        case V4L2_CID_AUTOGAIN:
+                if (ctrl->value)
+                        data = reg_set(icd, MT9V022_AEC_AGC_ENABLE, 0x2);
+                else
+                        data = reg_clear(icd, MT9V022_AEC_AGC_ENABLE, 0x2);
+                if (data < 0)
+                        return -EIO;
+                break;
+        case V4L2_CID_EXPOSURE_AUTO:
+                if (ctrl->value)
+                        data = reg_set(icd, MT9V022_AEC_AGC_ENABLE, 0x1);
+                else
+                        data = reg_clear(icd, MT9V022_AEC_AGC_ENABLE, 0x1);
+                if (data < 0)
+                        return -EIO;
+                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 mt9v022_video_probe(struct soc_camera_device *icd)
+{
+        struct mt9v022 *mt9v022 = container_of(icd, struct mt9v022, icd);
+        s32 data;
+        int ret;
+
+        if (!icd->dev.parent ||
+            to_soc_camera_host(icd->dev.parent)->nr != icd->iface)
+                return -ENODEV;
+
+        /* Read out the chip version register */
+        data = reg_read(icd, MT9V022_CHIP_VERSION);
+
+        /* must be 0x1311 or 0x1313 */
+        if (data != 0x1311 && data != 0x1313) {
+                ret = -ENODEV;
+                dev_info(&icd->dev, "No MT9V022 detected, ID register 0x%x\n",
+                         data);
+                goto ei2c;
+        }
+
+        /* Soft reset */
+        ret = reg_write(icd, MT9V022_RESET, 1);
+        if (ret < 0)
+                goto ei2c;
+        /* 15 clock cycles */
+        udelay(200);
+        if (reg_read(icd, MT9V022_RESET)) {
+                dev_err(&icd->dev, "Resetting MT9V022 failed!\n");
+                goto ei2c;
+        }
+
+        /* Set monochrome or colour sensor type */
+        if (sensor_type && (!strcmp("colour", sensor_type) ||
+                            !strcmp("color", sensor_type))) {
+                ret = reg_write(icd, MT9V022_PIXEL_OPERATION_MODE, 4 | 0x11);
+                mt9v022->model = V4L2_IDENT_MT9V022IX7ATC;
+        } else {
+                ret = reg_write(icd, MT9V022_PIXEL_OPERATION_MODE, 0x11);
+                mt9v022->model = V4L2_IDENT_MT9V022IX7ATM;
+        }
+
+        if (ret >= 0)
+                ret = soc_camera_video_start(icd);
+        if (ret < 0)
+                goto eisis;
+
+        dev_info(&icd->dev, "Detected a MT9V022 chip ID %x, %s sensor\n",
+                 data, mt9v022->model == V4L2_IDENT_MT9V022IX7ATM ?
+                 "monochrome" : "colour");
+
+        return 0;
+
+eisis:
+ei2c:
+        return ret;
+}
+
+static void mt9v022_video_remove(struct soc_camera_device *icd)
+{
+        struct mt9v022 *mt9v022 = container_of(icd, struct mt9v022, icd);
+
+        dev_dbg(&icd->dev, "Video %x removed: %p, %p\n", mt9v022->client->addr,
+                mt9v022->icd.dev.parent, mt9v022->icd.vdev);
+        soc_camera_video_stop(&mt9v022->icd);
+}
+
+static int mt9v022_probe(struct i2c_client *client)
+{
+        struct mt9v022 *mt9v022;
+        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, "MT9V022 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;
+        }
+
+        mt9v022 = kzalloc(sizeof(struct mt9v022), GFP_KERNEL);
+        if (!mt9v022)
+                return -ENOMEM;
+
+        mt9v022->chip_control = MT9V022_CHIP_CONTROL_DEFAULT;
+        mt9v022->client = client;
+        i2c_set_clientdata(client, mt9v022);
+
+        icd = &mt9v022->icd;
+        icd->probe      = mt9v022_video_probe;
+        icd->remove     = mt9v022_video_remove;
+        icd->ops        = &mt9v022_ops;
+        icd->control    = &client->dev;
+        icd->x_min      = 1;
+        icd->y_min      = 4;
+        icd->x_current  = 1;
+        icd->y_current  = 4;
+        icd->width_min  = 48;
+        icd->width_max  = 752;
+        icd->height_min = 32;
+        icd->height_max = 480;
+        icd->y_skip_top = 1;
+        icd->iface      = icl->bus_id;
+        /* Default datawidth - this is the only width this camera (normally)
+         * supports. It is only with extra logic that it can support
+         * other widths. Therefore it seems to be a sensible default. */
+        mt9v022->datawidth = 10;
+
+        ret = bus_switch_request(mt9v022, icl);
+        if (ret)
+                goto eswinit;
+
+        ret = soc_camera_device_register(icd);
+        if (ret)
+                goto eisdr;
+
+        return 0;
+
+eisdr:
+        bus_switch_release(mt9v022);
+eswinit:
+        kfree(mt9v022);
+        return ret;
+}
+
+static int mt9v022_remove(struct i2c_client *client)
+{
+        struct mt9v022 *mt9v022 = i2c_get_clientdata(client);
+
+        soc_camera_device_unregister(&mt9v022->icd);
+        bus_switch_release(mt9v022);
+        kfree(mt9v022);
+
+        return 0;
+}
+
+static struct i2c_driver mt9v022_i2c_driver = {
+        .driver = {
+                .name = "mt9v022",
+        },
+        .probe          = mt9v022_probe,
+        .remove         = mt9v022_remove,
+};
+
+static int __init mt9v022_mod_init(void)
+{
+        return i2c_add_driver(&mt9v022_i2c_driver);
+}
+
+static void __exit mt9v022_mod_exit(void)
+{
+        i2c_del_driver(&mt9v022_i2c_driver);
+}
+
+module_init(mt9v022_mod_init);
+module_exit(mt9v022_mod_exit);
+
+MODULE_DESCRIPTION("Micron MT9V022 Camera driver");
+MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
+MODULE_LICENSE("GPL");