diff options
Diffstat (limited to 'drivers/media/i2c/soc_camera/mt9t031.c')
| -rw-r--r-- | drivers/media/i2c/soc_camera/mt9t031.c | 857 |
1 files changed, 857 insertions, 0 deletions
diff --git a/drivers/media/i2c/soc_camera/mt9t031.c b/drivers/media/i2c/soc_camera/mt9t031.c new file mode 100644 index 000000000000..1415074138a5 --- /dev/null +++ b/drivers/media/i2c/soc_camera/mt9t031.c @@ -0,0 +1,857 @@ +/* + * 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/device.h> +#include <linux/i2c.h> +#include <linux/log2.h> +#include <linux/pm.h> +#include <linux/slab.h> +#include <linux/v4l2-mediabus.h> +#include <linux/videodev2.h> +#include <linux/module.h> + +#include <media/soc_camera.h> +#include <media/v4l2-chip-ident.h> +#include <media/v4l2-subdev.h> +#include <media/v4l2-ctrls.h> + +/* + * ATTENTION: this driver still cannot be used outside of the soc-camera + * framework because of its PM implementation, using the video_device node. + * If hardware becomes available for testing, alternative PM approaches shall + * be considered and tested. + */ + +/* + * mt9t031 i2c address 0x5d + * The platform has to define i2c_board_info and link to it from + * struct soc_camera_link + */ + +/* 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 18 +#define MT9T031_HORIZONTAL_BLANK 142 +#define MT9T031_VERTICAL_BLANK 25 +#define MT9T031_COLUMN_SKIP 32 +#define MT9T031_ROW_SKIP 20 + +struct mt9t031 { + struct v4l2_subdev subdev; + struct v4l2_ctrl_handler hdl; + struct { + /* exposure/auto-exposure cluster */ + struct v4l2_ctrl *autoexposure; + struct v4l2_ctrl *exposure; + }; + struct v4l2_rect rect; /* Sensor window */ + int model; /* V4L2_IDENT_MT9T031* codes from v4l2-chip-ident.h */ + u16 xskip; + u16 yskip; + unsigned int total_h; + unsigned short y_skip_top; /* Lines to skip at the top */ +}; + +static struct mt9t031 *to_mt9t031(const struct i2c_client *client) +{ + return container_of(i2c_get_clientdata(client), struct mt9t031, subdev); +} + +static int reg_read(struct i2c_client *client, const u8 reg) +{ + return i2c_smbus_read_word_swapped(client, reg); +} + +static int reg_write(struct i2c_client *client, const u8 reg, + const u16 data) +{ + return i2c_smbus_write_word_swapped(client, reg, data); +} + +static int reg_set(struct i2c_client *client, const u8 reg, + const u16 data) +{ + int ret; + + ret = reg_read(client, reg); + if (ret < 0) + return ret; + return reg_write(client, reg, ret | data); +} + +static int reg_clear(struct i2c_client *client, const u8 reg, + const u16 data) +{ + int ret; + + ret = reg_read(client, reg); + if (ret < 0) + return ret; + return reg_write(client, reg, ret & ~data); +} + +static int set_shutter(struct i2c_client *client, const u32 data) +{ + int ret; + + ret = reg_write(client, MT9T031_SHUTTER_WIDTH_UPPER, data >> 16); + + if (ret >= 0) + ret = reg_write(client, MT9T031_SHUTTER_WIDTH, data & 0xffff); + + return ret; +} + +static int get_shutter(struct i2c_client *client, u32 *data) +{ + int ret; + + ret = reg_read(client, MT9T031_SHUTTER_WIDTH_UPPER); + *data = ret << 16; + + if (ret >= 0) + ret = reg_read(client, MT9T031_SHUTTER_WIDTH); + *data |= ret & 0xffff; + + return ret < 0 ? ret : 0; +} + +static int mt9t031_idle(struct i2c_client *client) +{ + int ret; + + /* Disable chip output, synchronous option update */ + ret = reg_write(client, MT9T031_RESET, 1); + if (ret >= 0) + ret = reg_write(client, MT9T031_RESET, 0); + if (ret >= 0) + ret = reg_clear(client, MT9T031_OUTPUT_CONTROL, 2); + + return ret >= 0 ? 0 : -EIO; +} + +static int mt9t031_disable(struct i2c_client *client) +{ + /* Disable the chip */ + reg_clear(client, MT9T031_OUTPUT_CONTROL, 2); + + return 0; +} + +static int mt9t031_s_stream(struct v4l2_subdev *sd, int enable) +{ + struct i2c_client *client = v4l2_get_subdevdata(sd); + int ret; + + if (enable) + /* Switch to master "normal" mode */ + ret = reg_set(client, MT9T031_OUTPUT_CONTROL, 2); + else + /* Stop sensor readout */ + ret = reg_clear(client, MT9T031_OUTPUT_CONTROL, 2); + + if (ret < 0) + return -EIO; + + return 0; +} + +/* target must be _even_ */ +static u16 mt9t031_skip(s32 *source, s32 target, s32 max) +{ + unsigned int skip; + + if (*source < target + target / 2) { + *source = target; + return 1; + } + + skip = min(max, *source + target / 2) / target; + if (skip > 8) + skip = 8; + *source = target * skip; + + return skip; +} + +/* rect is the sensor rectangle, the caller guarantees parameter validity */ +static int mt9t031_set_params(struct i2c_client *client, + struct v4l2_rect *rect, u16 xskip, u16 yskip) +{ + struct mt9t031 *mt9t031 = to_mt9t031(client); + int ret; + u16 xbin, ybin; + const u16 hblank = MT9T031_HORIZONTAL_BLANK, + vblank = MT9T031_VERTICAL_BLANK; + + xbin = min(xskip, (u16)3); + ybin = min(yskip, (u16)3); + + /* + * Could just do roundup(rect->left, [xy]bin * 2); but this is cheaper. + * There is always a valid suitably aligned value. The worst case is + * xbin = 3, width = 2048. Then we will start at 36, the last read out + * pixel will be 2083, which is < 2085 - first black pixel. + * + * MT9T031 datasheet imposes window left border alignment, depending on + * the selected xskip. Failing to conform to this requirement produces + * dark horizontal stripes in the image. However, even obeying to this + * requirement doesn't eliminate the stripes in all configurations. They + * appear "locally reproducibly," but can differ between tests under + * different lighting conditions. + */ + switch (xbin) { + case 1: + rect->left &= ~1; + break; + case 2: + rect->left &= ~3; + break; + case 3: + rect->left = rect->left > roundup(MT9T031_COLUMN_SKIP, 6) ? + (rect->left / 6) * 6 : roundup(MT9T031_COLUMN_SKIP, 6); + } + + rect->top &= ~1; + + dev_dbg(&client->dev, "skip %u:%u, rect %ux%u@%u:%u\n", + xskip, yskip, rect->width, rect->height, rect->left, rect->top); + + /* Disable register update, reconfigure atomically */ + ret = reg_set(client, MT9T031_OUTPUT_CONTROL, 1); + if (ret < 0) + return ret; + + /* Blanking and start values - default... */ + ret = reg_write(client, MT9T031_HORIZONTAL_BLANKING, hblank); + if (ret >= 0) + ret = reg_write(client, MT9T031_VERTICAL_BLANKING, vblank); + + if (yskip != mt9t031->yskip || xskip != mt9t031->xskip) { + /* Binning, skipping */ + if (ret >= 0) + ret = reg_write(client, MT9T031_COLUMN_ADDRESS_MODE, + ((xbin - 1) << 4) | (xskip - 1)); + if (ret >= 0) + ret = reg_write(client, MT9T031_ROW_ADDRESS_MODE, + ((ybin - 1) << 4) | (yskip - 1)); + } + dev_dbg(&client->dev, "new physical left %u, top %u\n", + rect->left, rect->top); + + /* + * The caller provides a supported format, as guaranteed by + * .try_mbus_fmt(), soc_camera_s_crop() and soc_camera_cropcap() + */ + if (ret >= 0) + ret = reg_write(client, MT9T031_COLUMN_START, rect->left); + if (ret >= 0) + ret = reg_write(client, MT9T031_ROW_START, rect->top); + if (ret >= 0) + ret = reg_write(client, MT9T031_WINDOW_WIDTH, rect->width - 1); + if (ret >= 0) + ret = reg_write(client, MT9T031_WINDOW_HEIGHT, + rect->height + mt9t031->y_skip_top - 1); + if (ret >= 0 && v4l2_ctrl_g_ctrl(mt9t031->autoexposure) == V4L2_EXPOSURE_AUTO) { + mt9t031->total_h = rect->height + mt9t031->y_skip_top + vblank; + + ret = set_shutter(client, mt9t031->total_h); + } + + /* Re-enable register update, commit all changes */ + if (ret >= 0) + ret = reg_clear(client, MT9T031_OUTPUT_CONTROL, 1); + + if (ret >= 0) { + mt9t031->rect = *rect; + mt9t031->xskip = xskip; + mt9t031->yskip = yskip; + } + + return ret < 0 ? ret : 0; +} + +static int mt9t031_s_crop(struct v4l2_subdev *sd, struct v4l2_crop *a) +{ + struct v4l2_rect rect = a->c; + struct i2c_client *client = v4l2_get_subdevdata(sd); + struct mt9t031 *mt9t031 = to_mt9t031(client); + + rect.width = ALIGN(rect.width, 2); + rect.height = ALIGN(rect.height, 2); + + soc_camera_limit_side(&rect.left, &rect.width, + MT9T031_COLUMN_SKIP, MT9T031_MIN_WIDTH, MT9T031_MAX_WIDTH); + + soc_camera_limit_side(&rect.top, &rect.height, + MT9T031_ROW_SKIP, MT9T031_MIN_HEIGHT, MT9T031_MAX_HEIGHT); + + return mt9t031_set_params(client, &rect, mt9t031->xskip, mt9t031->yskip); +} + +static int mt9t031_g_crop(struct v4l2_subdev *sd, struct v4l2_crop *a) +{ + struct i2c_client *client = v4l2_get_subdevdata(sd); + struct mt9t031 *mt9t031 = to_mt9t031(client); + + a->c = mt9t031->rect; + a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + + return 0; +} + +static int mt9t031_cropcap(struct v4l2_subdev *sd, struct v4l2_cropcap *a) +{ + a->bounds.left = MT9T031_COLUMN_SKIP; + a->bounds.top = MT9T031_ROW_SKIP; + a->bounds.width = MT9T031_MAX_WIDTH; + a->bounds.height = MT9T031_MAX_HEIGHT; + a->defrect = a->bounds; + a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + a->pixelaspect.numerator = 1; + a->pixelaspect.denominator = 1; + + return 0; +} + +static int mt9t031_g_fmt(struct v4l2_subdev *sd, + struct v4l2_mbus_framefmt *mf) +{ + struct i2c_client *client = v4l2_get_subdevdata(sd); + struct mt9t031 *mt9t031 = to_mt9t031(client); + + mf->width = mt9t031->rect.width / mt9t031->xskip; + mf->height = mt9t031->rect.height / mt9t031->yskip; + mf->code = V4L2_MBUS_FMT_SBGGR10_1X10; + mf->colorspace = V4L2_COLORSPACE_SRGB; + mf->field = V4L2_FIELD_NONE; + + return 0; +} + +static int mt9t031_s_fmt(struct v4l2_subdev *sd, + struct v4l2_mbus_framefmt *mf) +{ + struct i2c_client *client = v4l2_get_subdevdata(sd); + struct mt9t031 *mt9t031 = to_mt9t031(client); + u16 xskip, yskip; + struct v4l2_rect rect = mt9t031->rect; + + /* + * try_fmt has put width and height within limits. + * S_FMT: use binning and skipping for scaling + */ + xskip = mt9t031_skip(&rect.width, mf->width, MT9T031_MAX_WIDTH); + yskip = mt9t031_skip(&rect.height, mf->height, MT9T031_MAX_HEIGHT); + + mf->code = V4L2_MBUS_FMT_SBGGR10_1X10; + mf->colorspace = V4L2_COLORSPACE_SRGB; + + /* mt9t031_set_params() doesn't change width and height */ + return mt9t031_set_params(client, &rect, xskip, yskip); +} + +/* + * If a user window larger than sensor window is requested, we'll increase the + * sensor window. + */ +static int mt9t031_try_fmt(struct v4l2_subdev *sd, + struct v4l2_mbus_framefmt *mf) +{ + v4l_bound_align_image( + &mf->width, MT9T031_MIN_WIDTH, MT9T031_MAX_WIDTH, 1, + &mf->height, MT9T031_MIN_HEIGHT, MT9T031_MAX_HEIGHT, 1, 0); + + mf->code = V4L2_MBUS_FMT_SBGGR10_1X10; + mf->colorspace = V4L2_COLORSPACE_SRGB; + + return 0; +} + +static int mt9t031_g_chip_ident(struct v4l2_subdev *sd, + struct v4l2_dbg_chip_ident *id) +{ + struct i2c_client *client = v4l2_get_subdevdata(sd); + struct mt9t031 *mt9t031 = to_mt9t031(client); + + if (id->match.type != V4L2_CHIP_MATCH_I2C_ADDR) + return -EINVAL; + + if (id->match.addr != client->addr) + return -ENODEV; + + id->ident = mt9t031->model; + id->revision = 0; + + return 0; +} + +#ifdef CONFIG_VIDEO_ADV_DEBUG +static int mt9t031_g_register(struct v4l2_subdev *sd, + struct v4l2_dbg_register *reg) +{ + struct i2c_client *client = v4l2_get_subdevdata(sd); + + if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff) + return -EINVAL; + + if (reg->match.addr != client->addr) + return -ENODEV; + + reg->val = reg_read(client, reg->reg); + + if (reg->val > 0xffff) + return -EIO; + + return 0; +} + +static int mt9t031_s_register(struct v4l2_subdev *sd, + struct v4l2_dbg_register *reg) +{ + struct i2c_client *client = v4l2_get_subdevdata(sd); + + if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff) + return -EINVAL; + + if (reg->match.addr != client->addr) + return -ENODEV; + + if (reg_write(client, reg->reg, reg->val) < 0) + return -EIO; + + return 0; +} +#endif + +static int mt9t031_g_volatile_ctrl(struct v4l2_ctrl *ctrl) +{ + struct mt9t031 *mt9t031 = container_of(ctrl->handler, + struct mt9t031, hdl); + const u32 shutter_max = MT9T031_MAX_HEIGHT + MT9T031_VERTICAL_BLANK; + s32 min, max; + + switch (ctrl->id) { + case V4L2_CID_EXPOSURE_AUTO: + min = mt9t031->exposure->minimum; + max = mt9t031->exposure->maximum; + mt9t031->exposure->val = + (shutter_max / 2 + (mt9t031->total_h - 1) * (max - min)) + / shutter_max + min; + break; + } + return 0; +} + +static int mt9t031_s_ctrl(struct v4l2_ctrl *ctrl) +{ + struct mt9t031 *mt9t031 = container_of(ctrl->handler, + struct mt9t031, hdl); + struct v4l2_subdev *sd = &mt9t031->subdev; + struct i2c_client *client = v4l2_get_subdevdata(sd); + struct v4l2_ctrl *exp = mt9t031->exposure; + int data; + + switch (ctrl->id) { + case V4L2_CID_VFLIP: + if (ctrl->val) + data = reg_set(client, MT9T031_READ_MODE_2, 0x8000); + else + data = reg_clear(client, MT9T031_READ_MODE_2, 0x8000); + if (data < 0) + return -EIO; + return 0; + case V4L2_CID_HFLIP: + if (ctrl->val) + data = reg_set(client, MT9T031_READ_MODE_2, 0x4000); + else + data = reg_clear(client, MT9T031_READ_MODE_2, 0x4000); + if (data < 0) + return -EIO; + return 0; + case V4L2_CID_GAIN: + /* See Datasheet Table 7, Gain settings. */ + if (ctrl->val <= ctrl->default_value) { + /* Pack it into 0..1 step 0.125, register values 0..8 */ + unsigned long range = ctrl->default_value - ctrl->minimum; + data = ((ctrl->val - ctrl->minimum) * 8 + range / 2) / range; + + dev_dbg(&client->dev, "Setting gain %d\n", data); + data = reg_write(client, MT9T031_GLOBAL_GAIN, data); + if (data < 0) + return -EIO; + } else { + /* Pack it into 1.125..128 variable step, register values 9..0x7860 */ + /* We assume qctrl->maximum - qctrl->default_value - 1 > 0 */ + unsigned long range = ctrl->maximum - ctrl->default_value - 1; + /* calculated gain: map 65..127 to 9..1024 step 0.125 */ + unsigned long gain = ((ctrl->val - ctrl->default_value - 1) * + 1015 + range / 2) / range + 9; + + if (gain <= 32) /* calculated gain 9..32 -> 9..32 */ + data = gain; + else if (gain <= 64) /* calculated gain 33..64 -> 0x51..0x60 */ + data = ((gain - 32) * 16 + 16) / 32 + 80; + else + /* calculated gain 65..1024 -> (1..120) << 8 + 0x60 */ + data = (((gain - 64 + 7) * 32) & 0xff00) | 0x60; + + dev_dbg(&client->dev, "Set gain from 0x%x to 0x%x\n", + reg_read(client, MT9T031_GLOBAL_GAIN), data); + data = reg_write(client, MT9T031_GLOBAL_GAIN, data); + if (data < 0) + return -EIO; + } + return 0; + + case V4L2_CID_EXPOSURE_AUTO: + if (ctrl->val == V4L2_EXPOSURE_MANUAL) { + unsigned int range = exp->maximum - exp->minimum; + unsigned int shutter = ((exp->val - exp->minimum) * 1048 + + range / 2) / range + 1; + u32 old; + + get_shutter(client, &old); + dev_dbg(&client->dev, "Set shutter from %u to %u\n", + old, shutter); + if (set_shutter(client, shutter) < 0) + return -EIO; + } else { + const u16 vblank = MT9T031_VERTICAL_BLANK; + mt9t031->total_h = mt9t031->rect.height + + mt9t031->y_skip_top + vblank; + + if (set_shutter(client, mt9t031->total_h) < 0) + return -EIO; + } + return 0; + default: + return -EINVAL; + } + return 0; +} + +/* + * Power Management: + * This function does nothing for now but must be present for pm to work + */ +static int mt9t031_runtime_suspend(struct device *dev) +{ + return 0; +} + +/* + * Power Management: + * COLUMN_ADDRESS_MODE and ROW_ADDRESS_MODE are not rewritten if unchanged + * they are however changed at reset if the platform hook is present + * thus we rewrite them with the values stored by the driver + */ +static int mt9t031_runtime_resume(struct device *dev) +{ + struct video_device *vdev = to_video_device(dev); + struct v4l2_subdev *sd = soc_camera_vdev_to_subdev(vdev); + struct i2c_client *client = v4l2_get_subdevdata(sd); + struct mt9t031 *mt9t031 = to_mt9t031(client); + + int ret; + u16 xbin, ybin; + + xbin = min(mt9t031->xskip, (u16)3); + ybin = min(mt9t031->yskip, (u16)3); + + ret = reg_write(client, MT9T031_COLUMN_ADDRESS_MODE, + ((xbin - 1) << 4) | (mt9t031->xskip - 1)); + if (ret < 0) + return ret; + + ret = reg_write(client, MT9T031_ROW_ADDRESS_MODE, + ((ybin - 1) << 4) | (mt9t031->yskip - 1)); + if (ret < 0) + return ret; + + return 0; +} + +static struct dev_pm_ops mt9t031_dev_pm_ops = { + .runtime_suspend = mt9t031_runtime_suspend, + .runtime_resume = mt9t031_runtime_resume, +}; + +static struct device_type mt9t031_dev_type = { + .name = "MT9T031", + .pm = &mt9t031_dev_pm_ops, +}; + +static int mt9t031_s_power(struct v4l2_subdev *sd, int on) +{ + struct i2c_client *client = v4l2_get_subdevdata(sd); + struct video_device *vdev = soc_camera_i2c_to_vdev(client); + + if (on) + vdev->dev.type = &mt9t031_dev_type; + else + vdev->dev.type = NULL; + + 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 i2c_client *client) +{ + struct mt9t031 *mt9t031 = to_mt9t031(client); + s32 data; + int ret; + + /* Enable the chip */ + data = reg_write(client, MT9T031_CHIP_ENABLE, 1); + dev_dbg(&client->dev, "write: %d\n", data); + + /* Read out the chip version register */ + data = reg_read(client, MT9T031_CHIP_VERSION); + + switch (data) { + case 0x1621: + mt9t031->model = V4L2_IDENT_MT9T031; + break; + default: + dev_err(&client->dev, + "No MT9T031 chip detected, register read %x\n", data); + return -ENODEV; + } + + dev_info(&client->dev, "Detected a MT9T031 chip ID %x\n", data); + + ret = mt9t031_idle(client); + if (ret < 0) + dev_err(&client->dev, "Failed to initialise the camera\n"); + else + v4l2_ctrl_handler_setup(&mt9t031->hdl); + + return ret; +} + +static int mt9t031_g_skip_top_lines(struct v4l2_subdev *sd, u32 *lines) +{ + struct i2c_client *client = v4l2_get_subdevdata(sd); + struct mt9t031 *mt9t031 = to_mt9t031(client); + + *lines = mt9t031->y_skip_top; + + return 0; +} + +static const struct v4l2_ctrl_ops mt9t031_ctrl_ops = { + .g_volatile_ctrl = mt9t031_g_volatile_ctrl, + .s_ctrl = mt9t031_s_ctrl, +}; + +static struct v4l2_subdev_core_ops mt9t031_subdev_core_ops = { + .g_chip_ident = mt9t031_g_chip_ident, + .s_power = mt9t031_s_power, +#ifdef CONFIG_VIDEO_ADV_DEBUG + .g_register = mt9t031_g_register, + .s_register = mt9t031_s_register, +#endif +}; + +static int mt9t031_enum_fmt(struct v4l2_subdev *sd, unsigned int index, + enum v4l2_mbus_pixelcode *code) +{ + if (index) + return -EINVAL; + + *code = V4L2_MBUS_FMT_SBGGR10_1X10; + return 0; +} + +static int mt9t031_g_mbus_config(struct v4l2_subdev *sd, + struct v4l2_mbus_config *cfg) +{ + struct i2c_client *client = v4l2_get_subdevdata(sd); + struct soc_camera_link *icl = soc_camera_i2c_to_link(client); + + cfg->flags = V4L2_MBUS_MASTER | V4L2_MBUS_PCLK_SAMPLE_RISING | + V4L2_MBUS_PCLK_SAMPLE_FALLING | V4L2_MBUS_HSYNC_ACTIVE_HIGH | + V4L2_MBUS_VSYNC_ACTIVE_HIGH | V4L2_MBUS_DATA_ACTIVE_HIGH; + cfg->type = V4L2_MBUS_PARALLEL; + cfg->flags = soc_camera_apply_board_flags(icl, cfg); + + return 0; +} + +static int mt9t031_s_mbus_config(struct v4l2_subdev *sd, + const struct v4l2_mbus_config *cfg) +{ + struct i2c_client *client = v4l2_get_subdevdata(sd); + struct soc_camera_link *icl = soc_camera_i2c_to_link(client); + + if (soc_camera_apply_board_flags(icl, cfg) & + V4L2_MBUS_PCLK_SAMPLE_FALLING) + return reg_clear(client, MT9T031_PIXEL_CLOCK_CONTROL, 0x8000); + else + return reg_set(client, MT9T031_PIXEL_CLOCK_CONTROL, 0x8000); +} + +static struct v4l2_subdev_video_ops mt9t031_subdev_video_ops = { + .s_stream = mt9t031_s_stream, + .s_mbus_fmt = mt9t031_s_fmt, + .g_mbus_fmt = mt9t031_g_fmt, + .try_mbus_fmt = mt9t031_try_fmt, + .s_crop = mt9t031_s_crop, + .g_crop = mt9t031_g_crop, + .cropcap = mt9t031_cropcap, + .enum_mbus_fmt = mt9t031_enum_fmt, + .g_mbus_config = mt9t031_g_mbus_config, + .s_mbus_config = mt9t031_s_mbus_config, +}; + +static struct v4l2_subdev_sensor_ops mt9t031_subdev_sensor_ops = { + .g_skip_top_lines = mt9t031_g_skip_top_lines, +}; + +static struct v4l2_subdev_ops mt9t031_subdev_ops = { + .core = &mt9t031_subdev_core_ops, + .video = &mt9t031_subdev_video_ops, + .sensor = &mt9t031_subdev_sensor_ops, +}; + +static int mt9t031_probe(struct i2c_client *client, + const struct i2c_device_id *did) +{ + struct mt9t031 *mt9t031; + struct soc_camera_link *icl = soc_camera_i2c_to_link(client); + struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); + 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; + + v4l2_i2c_subdev_init(&mt9t031->subdev, client, &mt9t031_subdev_ops); + v4l2_ctrl_handler_init(&mt9t031->hdl, 5); + v4l2_ctrl_new_std(&mt9t031->hdl, &mt9t031_ctrl_ops, + V4L2_CID_VFLIP, 0, 1, 1, 0); + v4l2_ctrl_new_std(&mt9t031->hdl, &mt9t031_ctrl_ops, + V4L2_CID_HFLIP, 0, 1, 1, 0); + v4l2_ctrl_new_std(&mt9t031->hdl, &mt9t031_ctrl_ops, + V4L2_CID_GAIN, 0, 127, 1, 64); + + /* + * Simulated autoexposure. If enabled, we calculate shutter width + * ourselves in the driver based on vertical blanking and frame width + */ + mt9t031->autoexposure = v4l2_ctrl_new_std_menu(&mt9t031->hdl, + &mt9t031_ctrl_ops, V4L2_CID_EXPOSURE_AUTO, 1, 0, + V4L2_EXPOSURE_AUTO); + mt9t031->exposure = v4l2_ctrl_new_std(&mt9t031->hdl, &mt9t031_ctrl_ops, + V4L2_CID_EXPOSURE, 1, 255, 1, 255); + + mt9t031->subdev.ctrl_handler = &mt9t031->hdl; + if (mt9t031->hdl.error) { + int err = mt9t031->hdl.error; + + kfree(mt9t031); + return err; + } + v4l2_ctrl_auto_cluster(2, &mt9t031->autoexposure, + V4L2_EXPOSURE_MANUAL, true); + + mt9t031->y_skip_top = 0; + mt9t031->rect.left = MT9T031_COLUMN_SKIP; + mt9t031->rect.top = MT9T031_ROW_SKIP; + mt9t031->rect.width = MT9T031_MAX_WIDTH; + mt9t031->rect.height = MT9T031_MAX_HEIGHT; + + mt9t031->xskip = 1; + mt9t031->yskip = 1; + + mt9t031_idle(client); + + ret = mt9t031_video_probe(client); + + mt9t031_disable(client); + + if (ret) { + v4l2_ctrl_handler_free(&mt9t031->hdl); + kfree(mt9t031); + } + + return ret; +} + +static int mt9t031_remove(struct i2c_client *client) +{ + struct mt9t031 *mt9t031 = to_mt9t031(client); + + v4l2_device_unregister_subdev(&mt9t031->subdev); + v4l2_ctrl_handler_free(&mt9t031->hdl); + 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, +}; + +module_i2c_driver(mt9t031_i2c_driver); + +MODULE_DESCRIPTION("Micron MT9T031 Camera driver"); +MODULE_AUTHOR("Guennadi Liakhovetski <lg@denx.de>"); +MODULE_LICENSE("GPL v2"); |