V4L/DVB (7173): Add support for the MT9M001 camera
authorGuennadi Liakhovetski <g.liakhovetski@pengutronix.de>
Tue, 22 Apr 2008 17:42:04 +0000 (14:42 -0300)
committerMauro Carvalho Chehab <mchehab@infradead.org>
Thu, 24 Apr 2008 17:07:42 +0000 (14:07 -0300)
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>
drivers/media/video/Kconfig
drivers/media/video/Makefile
drivers/media/video/mt9m001.c [new file with mode: 0644]

index fb4bf089c68fdd0a6c591543d8504f23473d5a9a..393bbf92b100338d90eb89c210cea0a0634c3c18 100644 (file)
@@ -845,6 +845,21 @@ config SOC_CAMERA
          over a bus like PCI or USB. For example some i2c camera connected
          directly to the data bus of an SoC.
 
+config SOC_CAMERA_MT9M001
+       tristate "mt9m001 support"
+       depends on SOC_CAMERA && GENERIC_GPIO
+       select GPIO_PCA953X if MT9M001_PCA9536_SWITCH
+       help
+         This driver supports MT9M001 cameras from Micron, monochrome
+         and colour models.
+
+config MT9M001_PCA9536_SWITCH
+       bool "pca9536 datawidth switch for mt9m001"
+       depends on SOC_CAMERA_MT9M001
+       help
+         Select this if your MT9M001 camera uses a PCA9536 I2C GPIO
+         extender to switch between 8 and 10 bit datawidth modes
+
 config VIDEO_PXA27x
        tristate "PXA27x Quick Capture Interface driver"
        depends on VIDEO_DEV && PXA27x
index 874ed967f4162f0f368a51725d52b3b96a44c904..9321f68e52a7ff936cbe9db178e60423b132770b 100644 (file)
@@ -138,6 +138,7 @@ obj-$(CONFIG_VIDEO_CX23885) += cx23885/
 
 obj-$(CONFIG_VIDEO_PXA27x)     += pxa_camera.o
 obj-$(CONFIG_SOC_CAMERA)       += soc_camera.o
+obj-$(CONFIG_SOC_CAMERA_MT9M001)       += mt9m001.o
 
 EXTRA_CFLAGS += -Idrivers/media/dvb/dvb-core
 EXTRA_CFLAGS += -Idrivers/media/dvb/frontends
diff --git a/drivers/media/video/mt9m001.c b/drivers/media/video/mt9m001.c
new file mode 100644 (file)
index 0000000..3c5867c
--- /dev/null
@@ -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");