V4L/DVB (7173): Add support for the MT9M001 camera
This driver supports Micron MT9M001 monochrome and colour cameras.
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@pengutronix.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
diff --git a/drivers/media/video/mt9m001.c b/drivers/media/video/mt9m001.c
new file mode 100644
index 0000000..3c5867c
--- /dev/null
+++ b/drivers/media/video/mt9m001.c
@@ -0,0 +1,694 @@
+/*
+ * Driver for MT9M001 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/log2.h>
+
+#include <media/v4l2-common.h>
+#include <media/v4l2-chip-ident.h>
+#include <media/soc_camera.h>
+
+#include <asm/gpio.h>
+
+/* mt9m001 i2c address 0x5d
+ * The platform has to define i2c_board_info
+ * and call i2c_register_board_info() */
+
+/* mt9m001 selected register addresses */
+#define MT9M001_CHIP_VERSION 0x00
+#define MT9M001_ROW_START 0x01
+#define MT9M001_COLUMN_START 0x02
+#define MT9M001_WINDOW_HEIGHT 0x03
+#define MT9M001_WINDOW_WIDTH 0x04
+#define MT9M001_HORIZONTAL_BLANKING 0x05
+#define MT9M001_VERTICAL_BLANKING 0x06
+#define MT9M001_OUTPUT_CONTROL 0x07
+#define MT9M001_SHUTTER_WIDTH 0x09
+#define MT9M001_FRAME_RESTART 0x0b
+#define MT9M001_SHUTTER_DELAY 0x0c
+#define MT9M001_RESET 0x0d
+#define MT9M001_READ_OPTIONS1 0x1e
+#define MT9M001_READ_OPTIONS2 0x20
+#define MT9M001_GLOBAL_GAIN 0x35
+#define MT9M001_CHIP_ENABLE 0xF1
+
+static const struct soc_camera_data_format mt9m001_colour_formats[] = {
+ {
+ .name = "RGB Bayer (sRGB)",
+ .depth = 16,
+ .fourcc = V4L2_PIX_FMT_SBGGR8,
+ .colorspace = V4L2_COLORSPACE_SRGB,
+ }
+};
+
+static const struct soc_camera_data_format mt9m001_monochrome_formats[] = {
+ {
+ .name = "Monochrome 10 bit",
+ .depth = 10,
+ .fourcc = V4L2_PIX_FMT_Y16,
+ }, {
+ .name = "Monochrome 8 bit",
+ .depth = 8,
+ .fourcc = V4L2_PIX_FMT_GREY,
+ },
+};
+
+struct mt9m001 {
+ struct i2c_client *client;
+ struct soc_camera_device icd;
+ int model; /* V4L2_IDENT_MT9M001* codes from v4l2-chip-ident.h */
+ int switch_gpio;
+ unsigned char autoexposure;
+ unsigned char datawidth;
+};
+
+static int reg_read(struct soc_camera_device *icd, const u8 reg)
+{
+ struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
+ struct i2c_client *client = mt9m001->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 mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
+ return i2c_smbus_write_word_data(mt9m001->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 mt9m001_init(struct soc_camera_device *icd)
+{
+ int ret;
+
+ /* Disable chip, synchronous option update */
+ dev_dbg(icd->vdev->dev, "%s\n", __FUNCTION__);
+
+ ret = reg_write(icd, MT9M001_RESET, 1);
+ if (ret >= 0)
+ ret = reg_write(icd, MT9M001_RESET, 0);
+ if (ret >= 0)
+ ret = reg_write(icd, MT9M001_OUTPUT_CONTROL, 0);
+
+ return ret >= 0 ? 0 : -EIO;
+}
+
+static int mt9m001_release(struct soc_camera_device *icd)
+{
+ /* Disable the chip */
+ reg_write(icd, MT9M001_OUTPUT_CONTROL, 0);
+ return 0;
+}
+
+static int mt9m001_start_capture(struct soc_camera_device *icd)
+{
+ /* Switch to master "normal" mode */
+ if (reg_write(icd, MT9M001_OUTPUT_CONTROL, 2) < 0)
+ return -EIO;
+ return 0;
+}
+
+static int mt9m001_stop_capture(struct soc_camera_device *icd)
+{
+ /* Stop sensor readout */
+ if (reg_write(icd, MT9M001_OUTPUT_CONTROL, 0) < 0)
+ return -EIO;
+ return 0;
+}
+
+static int bus_switch_request(struct mt9m001 *mt9m001,
+ struct soc_camera_link *icl)
+{
+#ifdef CONFIG_MT9M001_PCA9536_SWITCH
+ int ret;
+ unsigned int gpio = icl->gpio;
+
+ if (gpio != NO_GPIO) {
+ /* We have a data bus switch. */
+ ret = gpio_request(gpio, "mt9m001");
+ if (ret < 0) {
+ dev_err(&mt9m001->client->dev, "Cannot get GPIO %u\n",
+ gpio);
+ return ret;
+ }
+
+ ret = gpio_direction_output(gpio, 0);
+ if (ret < 0) {
+ dev_err(&mt9m001->client->dev,
+ "Cannot set GPIO %u to output\n", gpio);
+ gpio_free(gpio);
+ return ret;
+ }
+ }
+
+ mt9m001->switch_gpio = gpio;
+#else
+ mt9m001->switch_gpio = NO_GPIO;
+#endif
+ return 0;
+}
+
+static void bus_switch_release(struct mt9m001 *mt9m001)
+{
+#ifdef CONFIG_MT9M001_PCA9536_SWITCH
+ if (mt9m001->switch_gpio != NO_GPIO)
+ gpio_free(mt9m001->switch_gpio);
+#endif
+}
+
+static int bus_switch_act(struct mt9m001 *mt9m001, int go8bit)
+{
+#ifdef CONFIG_MT9M001_PCA9536_SWITCH
+ if (mt9m001->switch_gpio == NO_GPIO)
+ return -ENODEV;
+
+ gpio_set_value_cansleep(mt9m001->switch_gpio, go8bit);
+ return 0;
+#else
+ return -ENODEV;
+#endif
+}
+
+static int mt9m001_set_capture_format(struct soc_camera_device *icd,
+ __u32 pixfmt, struct v4l2_rect *rect, unsigned int flags)
+{
+ struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
+ unsigned int width_flag = flags & (IS_DATAWIDTH_10 | IS_DATAWIDTH_9 |
+ IS_DATAWIDTH_8);
+ int ret;
+ const u16 hblank = 9, vblank = 25;
+
+ /* MT9M001 has all capture_format parameters fixed */
+ if (!(flags & IS_MASTER) ||
+ !(flags & IS_PCLK_SAMPLE_RISING) ||
+ !(flags & IS_HSYNC_ACTIVE_HIGH) ||
+ !(flags & IS_VSYNC_ACTIVE_HIGH))
+ return -EINVAL;
+
+ /* Only one width bit may be set */
+ if (!is_power_of_2(width_flag))
+ return -EINVAL;
+
+ if ((mt9m001->datawidth != 10 && (width_flag == IS_DATAWIDTH_10)) ||
+ (mt9m001->datawidth != 9 && (width_flag == IS_DATAWIDTH_9)) ||
+ (mt9m001->datawidth != 8 && (width_flag == IS_DATAWIDTH_8))) {
+ /* data width switch requested */
+ if (mt9m001->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(mt9m001,
+ width_flag == IS_DATAWIDTH_8);
+ if (ret < 0)
+ return ret;
+
+ mt9m001->datawidth = width_flag == IS_DATAWIDTH_8 ? 8 : 10;
+ }
+
+ /* Blanking and start values - default... */
+ ret = reg_write(icd, MT9M001_HORIZONTAL_BLANKING, hblank);
+ if (ret >= 0)
+ ret = reg_write(icd, MT9M001_VERTICAL_BLANKING, vblank);
+
+ /* The caller provides a supported format, as verified per
+ * call to icd->try_fmt_cap() */
+ if (ret >= 0)
+ ret = reg_write(icd, MT9M001_COLUMN_START, rect->left);
+ if (ret >= 0)
+ ret = reg_write(icd, MT9M001_ROW_START, rect->top);
+ if (ret >= 0)
+ ret = reg_write(icd, MT9M001_WINDOW_WIDTH, rect->width - 1);
+ if (ret >= 0)
+ ret = reg_write(icd, MT9M001_WINDOW_HEIGHT,
+ rect->height + icd->y_skip_top - 1);
+ if (ret >= 0 && mt9m001->autoexposure) {
+ ret = reg_write(icd, MT9M001_SHUTTER_WIDTH,
+ rect->height + icd->y_skip_top + vblank);
+ if (ret >= 0) {
+ const struct v4l2_queryctrl *qctrl =
+ soc_camera_find_qctrl(icd->ops,
+ V4L2_CID_EXPOSURE);
+ icd->exposure = (524 + (rect->height + icd->y_skip_top +
+ vblank - 1) *
+ (qctrl->maximum - qctrl->minimum)) /
+ 1048 + qctrl->minimum;
+ }
+ }
+
+ return ret < 0 ? ret : 0;
+}
+
+static int mt9m001_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 > 1024 + icd->y_skip_top)
+ f->fmt.pix.height = 1024 + icd->y_skip_top;
+ if (f->fmt.pix.width < 48)
+ f->fmt.pix.width = 48;
+ if (f->fmt.pix.width > 1280)
+ f->fmt.pix.width = 1280;
+ f->fmt.pix.width &= ~0x01; /* has to be even, unsure why was ~3 */
+
+ return 0;
+}
+
+static int mt9m001_get_chip_id(struct soc_camera_device *icd,
+ struct v4l2_chip_ident *id)
+{
+ struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
+
+ if (id->match_type != V4L2_CHIP_MATCH_I2C_ADDR)
+ return -EINVAL;
+
+ if (id->match_chip != mt9m001->client->addr)
+ return -ENODEV;
+
+ id->ident = mt9m001->model;
+ id->revision = 0;
+
+ return 0;
+}
+
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+static int mt9m001_get_register(struct soc_camera_device *icd,
+ struct v4l2_register *reg)
+{
+ struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
+
+ if (reg->match_type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
+ return -EINVAL;
+
+ if (reg->match_chip != mt9m001->client->addr)
+ return -ENODEV;
+
+ reg->val = reg_read(icd, reg->reg);
+
+ if (reg->val > 0xffff)
+ return -EIO;
+
+ return 0;
+}
+
+static int mt9m001_set_register(struct soc_camera_device *icd,
+ struct v4l2_register *reg)
+{
+ struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
+
+ if (reg->match_type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
+ return -EINVAL;
+
+ if (reg->match_chip != mt9m001->client->addr)
+ return -ENODEV;
+
+ if (reg_write(icd, reg->reg, reg->val) < 0)
+ return -EIO;
+
+ return 0;
+}
+#endif
+
+static unsigned int mt9m001_get_datawidth(struct soc_camera_device *icd)
+{
+ struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
+ return mt9m001->datawidth;
+}
+
+const struct v4l2_queryctrl mt9m001_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 mt9m001_get_control(struct soc_camera_device *icd, struct v4l2_control *ctrl);
+static int mt9m001_set_control(struct soc_camera_device *icd, struct v4l2_control *ctrl);
+
+static struct soc_camera_ops mt9m001_ops = {
+ .owner = THIS_MODULE,
+ .init = mt9m001_init,
+ .release = mt9m001_release,
+ .start_capture = mt9m001_start_capture,
+ .stop_capture = mt9m001_stop_capture,
+ .set_capture_format = mt9m001_set_capture_format,
+ .try_fmt_cap = mt9m001_try_fmt_cap,
+ .formats = NULL, /* Filled in later depending on the */
+ .num_formats = 0, /* camera type and data widths */
+ .get_datawidth = mt9m001_get_datawidth,
+ .controls = mt9m001_controls,
+ .num_controls = ARRAY_SIZE(mt9m001_controls),
+ .get_control = mt9m001_get_control,
+ .set_control = mt9m001_set_control,
+ .get_chip_id = mt9m001_get_chip_id,
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+ .get_register = mt9m001_get_register,
+ .set_register = mt9m001_set_register,
+#endif
+};
+
+static int mt9m001_get_control(struct soc_camera_device *icd, struct v4l2_control *ctrl)
+{
+ struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
+ int data;
+
+ switch (ctrl->id) {
+ case V4L2_CID_VFLIP:
+ data = reg_read(icd, MT9M001_READ_OPTIONS2);
+ if (data < 0)
+ return -EIO;
+ ctrl->value = !!(data & 0x8000);
+ break;
+ case V4L2_CID_EXPOSURE_AUTO:
+ ctrl->value = mt9m001->autoexposure;
+ break;
+ }
+ return 0;
+}
+
+static int mt9m001_set_control(struct soc_camera_device *icd, struct v4l2_control *ctrl)
+{
+ struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
+ const struct v4l2_queryctrl *qctrl;
+ int data;
+
+ qctrl = soc_camera_find_qctrl(&mt9m001_ops, ctrl->id);
+
+ if (!qctrl)
+ return -EINVAL;
+
+ switch (ctrl->id) {
+ case V4L2_CID_VFLIP:
+ if (ctrl->value)
+ data = reg_set(icd, MT9M001_READ_OPTIONS2, 0x8000);
+ else
+ data = reg_clear(icd, MT9M001_READ_OPTIONS2, 0x8000);
+ 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, MT9M001_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, MT9M001_GLOBAL_GAIN), data);
+ data = reg_write(icd, MT9M001_GLOBAL_GAIN, data);
+ if (data < 0)
+ return -EIO;
+ }
+
+ /* Success */
+ icd->gain = ctrl->value;
+ break;
+ case V4L2_CID_EXPOSURE:
+ /* mt9m001 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) * 1048 +
+ range / 2) / range + 1;
+
+ dev_dbg(&icd->dev, "Setting shutter width from %d to %lu\n",
+ reg_read(icd, MT9M001_SHUTTER_WIDTH), shutter);
+ if (reg_write(icd, MT9M001_SHUTTER_WIDTH, shutter) < 0)
+ return -EIO;
+ icd->exposure = ctrl->value;
+ mt9m001->autoexposure = 0;
+ }
+ break;
+ case V4L2_CID_EXPOSURE_AUTO:
+ if (ctrl->value) {
+ const u16 vblank = 25;
+ if (reg_write(icd, MT9M001_SHUTTER_WIDTH, icd->height +
+ icd->y_skip_top + vblank) < 0)
+ return -EIO;
+ qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_EXPOSURE);
+ icd->exposure = (524 + (icd->height + icd->y_skip_top + vblank - 1) *
+ (qctrl->maximum - qctrl->minimum)) /
+ 1048 + qctrl->minimum;
+ mt9m001->autoexposure = 1;
+ } else
+ mt9m001->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 mt9m001_video_probe(struct soc_camera_device *icd)
+{
+ struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, 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(&mt9m001->icd, MT9M001_CHIP_ENABLE, 1);
+ dev_dbg(&icd->dev, "write: %d\n", data);
+
+ /* Read out the chip version register */
+ data = reg_read(icd, MT9M001_CHIP_VERSION);
+
+ /* must be 0x8411 or 0x8421 for colour sensor and 8431 for bw */
+ switch (data) {
+ case 0x8411:
+ case 0x8421:
+ mt9m001->model = V4L2_IDENT_MT9M001C12ST;
+ mt9m001_ops.formats = mt9m001_colour_formats;
+ mt9m001_ops.num_formats = ARRAY_SIZE(mt9m001_colour_formats);
+ break;
+ case 0x8431:
+ mt9m001->model = V4L2_IDENT_MT9M001C12STM;
+ mt9m001_ops.formats = mt9m001_monochrome_formats;
+ if (mt9m001->client->dev.platform_data)
+ mt9m001_ops.num_formats = ARRAY_SIZE(mt9m001_monochrome_formats);
+ else
+ mt9m001_ops.num_formats = 1;
+ break;
+ default:
+ ret = -ENODEV;
+ dev_err(&icd->dev,
+ "No MT9M001 chip detected, register read %x\n", data);
+ goto ei2c;
+ }
+
+ dev_info(&icd->dev, "Detected a MT9M001 chip ID %x (%s)\n", data,
+ data == 0x8431 ? "C12STM" : "C12ST");
+
+ /* Now that we know the model, we can start video */
+ ret = soc_camera_video_start(icd);
+ if (ret)
+ goto eisis;
+
+ return 0;
+
+eisis:
+ei2c:
+ return ret;
+}
+
+static void mt9m001_video_remove(struct soc_camera_device *icd)
+{
+ struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
+
+ dev_dbg(&icd->dev, "Video %x removed: %p, %p\n", mt9m001->client->addr,
+ mt9m001->icd.dev.parent, mt9m001->icd.vdev);
+ soc_camera_video_stop(&mt9m001->icd);
+}
+
+static int mt9m001_probe(struct i2c_client *client)
+{
+ struct mt9m001 *mt9m001;
+ 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, "MT9M001 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;
+ }
+
+ mt9m001 = kzalloc(sizeof(struct mt9m001), GFP_KERNEL);
+ if (!mt9m001)
+ return -ENOMEM;
+
+ mt9m001->client = client;
+ i2c_set_clientdata(client, mt9m001);
+
+ /* Second stage probe - when a capture adapter is there */
+ icd = &mt9m001->icd;
+ icd->probe = mt9m001_video_probe;
+ icd->remove = mt9m001_video_remove;
+ icd->ops = &mt9m001_ops;
+ icd->control = &client->dev;
+ icd->x_min = 20;
+ icd->y_min = 12;
+ icd->x_current = 20;
+ icd->y_current = 12;
+ icd->width_min = 48;
+ icd->width_max = 1280;
+ icd->height_min = 32;
+ icd->height_max = 1024;
+ 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. */
+ mt9m001->datawidth = 10;
+ /* Simulated autoexposure. If enabled, we calculate shutter width
+ * ourselves in the driver based on vertical blanking and frame width */
+ mt9m001->autoexposure = 1;
+
+ ret = bus_switch_request(mt9m001, icl);
+ if (ret)
+ goto eswinit;
+
+ ret = soc_camera_device_register(icd);
+ if (ret)
+ goto eisdr;
+
+ return 0;
+
+eisdr:
+ bus_switch_release(mt9m001);
+eswinit:
+ kfree(mt9m001);
+ return ret;
+}
+
+static int mt9m001_remove(struct i2c_client *client)
+{
+ struct mt9m001 *mt9m001 = i2c_get_clientdata(client);
+
+ soc_camera_device_unregister(&mt9m001->icd);
+ bus_switch_release(mt9m001);
+ kfree(mt9m001);
+
+ return 0;
+}
+
+static struct i2c_driver mt9m001_i2c_driver = {
+ .driver = {
+ .name = "mt9m001",
+ },
+ .probe = mt9m001_probe,
+ .remove = mt9m001_remove,
+};
+
+static int __init mt9m001_mod_init(void)
+{
+ return i2c_add_driver(&mt9m001_i2c_driver);
+}
+
+static void __exit mt9m001_mod_exit(void)
+{
+ i2c_del_driver(&mt9m001_i2c_driver);
+}
+
+module_init(mt9m001_mod_init);
+module_exit(mt9m001_mod_exit);
+
+MODULE_DESCRIPTION("Micron MT9M001 Camera driver");
+MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
+MODULE_LICENSE("GPL");