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List: linux-i2c
Subject: [PATCH 4/4] soc-camera: add support for MT9T031 CMOS camera sensor
From: Guennadi Liakhovetski <g.liakhovetski () gmx ! de>
Date: 2008-12-17 18:45:56
Message-ID: Pine.LNX.4.64.0812171939420.8733 () axis700 ! grange
[Download RAW message or body]
This camera is rather similar to MT9M001, but also has a couple of
enhanced features, like pixel binning.
Signed-off-by: Guennadi Liakhovetski <lg@denx.de>
---
drivers/media/video/Kconfig | 6 +
drivers/media/video/Makefile | 1 +
drivers/media/video/mt9t031.c | 731 +++++++++++++++++++++++++++++++++++++++
include/media/v4l2-chip-ident.h | 1 +
4 files changed, 739 insertions(+), 0 deletions(-)
create mode 100644 drivers/media/video/mt9t031.c
diff --git a/drivers/media/video/Kconfig b/drivers/media/video/Kconfig
index c18557c..4f3803e 100644
--- a/drivers/media/video/Kconfig
+++ b/drivers/media/video/Kconfig
@@ -730,6 +730,12 @@ 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
diff --git a/drivers/media/video/Makefile b/drivers/media/video/Makefile
index cc6698e..490430e 100644
--- a/drivers/media/video/Makefile
+++ b/drivers/media/video/Makefile
@@ -132,6 +132,7 @@ obj-$(CONFIG_VIDEO_SH_MOBILE_CEU) += sh_mobile_ceu_camera.o
obj-$(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
index 0000000..e82c7c0
--- /dev/null
+++ b/drivers/media/video/mt9t031.c
@@ -0,0 +1,731 @@
+/*
+ * 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)
+{
+ return 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_info(&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_info(&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:
+ 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);
+ 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");
diff --git a/include/media/v4l2-chip-ident.h b/include/media/v4l2-chip-ident.h
index 52e778d..561ddda 100644
--- a/include/media/v4l2-chip-ident.h
+++ b/include/media/v4l2-chip-ident.h
@@ -171,6 +171,7 @@ 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
--
1.5.4
--
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