diff options
Diffstat (limited to 'drivers/media/i2c/mt9t001.c')
| -rw-r--r-- | drivers/media/i2c/mt9t001.c | 833 |
1 files changed, 833 insertions, 0 deletions
diff --git a/drivers/media/i2c/mt9t001.c b/drivers/media/i2c/mt9t001.c new file mode 100644 index 00000000000..6d343adf891 --- /dev/null +++ b/drivers/media/i2c/mt9t001.c @@ -0,0 +1,833 @@ +/* + * Driver for MT9T001 CMOS Image Sensor from Aptina (Micron) + * + * Copyright (C) 2010-2011, Laurent Pinchart <laurent.pinchart@ideasonboard.com> + * + * Based on the MT9M001 driver, + * + * 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/i2c.h> +#include <linux/module.h> +#include <linux/log2.h> +#include <linux/slab.h> +#include <linux/videodev2.h> +#include <linux/v4l2-mediabus.h> + +#include <media/mt9t001.h> +#include <media/v4l2-ctrls.h> +#include <media/v4l2-device.h> +#include <media/v4l2-subdev.h> + +#define MT9T001_PIXEL_ARRAY_HEIGHT 1568 +#define MT9T001_PIXEL_ARRAY_WIDTH 2112 + +#define MT9T001_CHIP_VERSION 0x00 +#define MT9T001_CHIP_ID 0x1621 +#define MT9T001_ROW_START 0x01 +#define MT9T001_ROW_START_MIN 0 +#define MT9T001_ROW_START_DEF 20 +#define MT9T001_ROW_START_MAX 1534 +#define MT9T001_COLUMN_START 0x02 +#define MT9T001_COLUMN_START_MIN 0 +#define MT9T001_COLUMN_START_DEF 32 +#define MT9T001_COLUMN_START_MAX 2046 +#define MT9T001_WINDOW_HEIGHT 0x03 +#define MT9T001_WINDOW_HEIGHT_MIN 1 +#define MT9T001_WINDOW_HEIGHT_DEF 1535 +#define MT9T001_WINDOW_HEIGHT_MAX 1567 +#define MT9T001_WINDOW_WIDTH 0x04 +#define MT9T001_WINDOW_WIDTH_MIN 1 +#define MT9T001_WINDOW_WIDTH_DEF 2047 +#define MT9T001_WINDOW_WIDTH_MAX 2111 +#define MT9T001_HORIZONTAL_BLANKING 0x05 +#define MT9T001_HORIZONTAL_BLANKING_MIN 21 +#define MT9T001_HORIZONTAL_BLANKING_MAX 1023 +#define MT9T001_VERTICAL_BLANKING 0x06 +#define MT9T001_VERTICAL_BLANKING_MIN 3 +#define MT9T001_VERTICAL_BLANKING_MAX 1023 +#define MT9T001_OUTPUT_CONTROL 0x07 +#define MT9T001_OUTPUT_CONTROL_SYNC (1 << 0) +#define MT9T001_OUTPUT_CONTROL_CHIP_ENABLE (1 << 1) +#define MT9T001_OUTPUT_CONTROL_TEST_DATA (1 << 6) +#define MT9T001_SHUTTER_WIDTH_HIGH 0x08 +#define MT9T001_SHUTTER_WIDTH_LOW 0x09 +#define MT9T001_SHUTTER_WIDTH_MIN 1 +#define MT9T001_SHUTTER_WIDTH_DEF 1561 +#define MT9T001_SHUTTER_WIDTH_MAX (1024 * 1024) +#define MT9T001_PIXEL_CLOCK 0x0a +#define MT9T001_PIXEL_CLOCK_INVERT (1 << 15) +#define MT9T001_PIXEL_CLOCK_SHIFT_MASK (7 << 8) +#define MT9T001_PIXEL_CLOCK_SHIFT_SHIFT 8 +#define MT9T001_PIXEL_CLOCK_DIVIDE_MASK (0x7f << 0) +#define MT9T001_FRAME_RESTART 0x0b +#define MT9T001_SHUTTER_DELAY 0x0c +#define MT9T001_SHUTTER_DELAY_MAX 2047 +#define MT9T001_RESET 0x0d +#define MT9T001_READ_MODE1 0x1e +#define MT9T001_READ_MODE_SNAPSHOT (1 << 8) +#define MT9T001_READ_MODE_STROBE_ENABLE (1 << 9) +#define MT9T001_READ_MODE_STROBE_WIDTH (1 << 10) +#define MT9T001_READ_MODE_STROBE_OVERRIDE (1 << 11) +#define MT9T001_READ_MODE2 0x20 +#define MT9T001_READ_MODE_BAD_FRAMES (1 << 0) +#define MT9T001_READ_MODE_LINE_VALID_CONTINUOUS (1 << 9) +#define MT9T001_READ_MODE_LINE_VALID_FRAME (1 << 10) +#define MT9T001_READ_MODE3 0x21 +#define MT9T001_READ_MODE_GLOBAL_RESET (1 << 0) +#define MT9T001_READ_MODE_GHST_CTL (1 << 1) +#define MT9T001_ROW_ADDRESS_MODE 0x22 +#define MT9T001_ROW_SKIP_MASK (7 << 0) +#define MT9T001_ROW_BIN_MASK (3 << 3) +#define MT9T001_ROW_BIN_SHIFT 3 +#define MT9T001_COLUMN_ADDRESS_MODE 0x23 +#define MT9T001_COLUMN_SKIP_MASK (7 << 0) +#define MT9T001_COLUMN_BIN_MASK (3 << 3) +#define MT9T001_COLUMN_BIN_SHIFT 3 +#define MT9T001_GREEN1_GAIN 0x2b +#define MT9T001_BLUE_GAIN 0x2c +#define MT9T001_RED_GAIN 0x2d +#define MT9T001_GREEN2_GAIN 0x2e +#define MT9T001_TEST_DATA 0x32 +#define MT9T001_GLOBAL_GAIN 0x35 +#define MT9T001_GLOBAL_GAIN_MIN 8 +#define MT9T001_GLOBAL_GAIN_MAX 1024 +#define MT9T001_BLACK_LEVEL 0x49 +#define MT9T001_ROW_BLACK_DEFAULT_OFFSET 0x4b +#define MT9T001_BLC_DELTA_THRESHOLDS 0x5d +#define MT9T001_CAL_THRESHOLDS 0x5f +#define MT9T001_GREEN1_OFFSET 0x60 +#define MT9T001_GREEN2_OFFSET 0x61 +#define MT9T001_BLACK_LEVEL_CALIBRATION 0x62 +#define MT9T001_BLACK_LEVEL_OVERRIDE (1 << 0) +#define MT9T001_BLACK_LEVEL_DISABLE_OFFSET (1 << 1) +#define MT9T001_BLACK_LEVEL_RECALCULATE (1 << 12) +#define MT9T001_BLACK_LEVEL_LOCK_RED_BLUE (1 << 13) +#define MT9T001_BLACK_LEVEL_LOCK_GREEN (1 << 14) +#define MT9T001_RED_OFFSET 0x63 +#define MT9T001_BLUE_OFFSET 0x64 + +struct mt9t001 { + struct v4l2_subdev subdev; + struct media_pad pad; + + struct v4l2_mbus_framefmt format; + struct v4l2_rect crop; + + struct v4l2_ctrl_handler ctrls; + struct v4l2_ctrl *gains[4]; + + u16 output_control; + u16 black_level; +}; + +static inline struct mt9t001 *to_mt9t001(struct v4l2_subdev *sd) +{ + return container_of(sd, struct mt9t001, subdev); +} + +static int mt9t001_read(struct i2c_client *client, u8 reg) +{ + return i2c_smbus_read_word_swapped(client, reg); +} + +static int mt9t001_write(struct i2c_client *client, u8 reg, u16 data) +{ + return i2c_smbus_write_word_swapped(client, reg, data); +} + +static int mt9t001_set_output_control(struct mt9t001 *mt9t001, u16 clear, + u16 set) +{ + struct i2c_client *client = v4l2_get_subdevdata(&mt9t001->subdev); + u16 value = (mt9t001->output_control & ~clear) | set; + int ret; + + if (value == mt9t001->output_control) + return 0; + + ret = mt9t001_write(client, MT9T001_OUTPUT_CONTROL, value); + if (ret < 0) + return ret; + + mt9t001->output_control = value; + return 0; +} + +/* ----------------------------------------------------------------------------- + * V4L2 subdev video operations + */ + +static struct v4l2_mbus_framefmt * +__mt9t001_get_pad_format(struct mt9t001 *mt9t001, struct v4l2_subdev_fh *fh, + unsigned int pad, enum v4l2_subdev_format_whence which) +{ + switch (which) { + case V4L2_SUBDEV_FORMAT_TRY: + return v4l2_subdev_get_try_format(fh, pad); + case V4L2_SUBDEV_FORMAT_ACTIVE: + return &mt9t001->format; + default: + return NULL; + } +} + +static struct v4l2_rect * +__mt9t001_get_pad_crop(struct mt9t001 *mt9t001, struct v4l2_subdev_fh *fh, + unsigned int pad, enum v4l2_subdev_format_whence which) +{ + switch (which) { + case V4L2_SUBDEV_FORMAT_TRY: + return v4l2_subdev_get_try_crop(fh, pad); + case V4L2_SUBDEV_FORMAT_ACTIVE: + return &mt9t001->crop; + default: + return NULL; + } +} + +static int mt9t001_s_stream(struct v4l2_subdev *subdev, int enable) +{ + const u16 mode = MT9T001_OUTPUT_CONTROL_CHIP_ENABLE; + struct i2c_client *client = v4l2_get_subdevdata(subdev); + struct mt9t001 *mt9t001 = to_mt9t001(subdev); + struct v4l2_mbus_framefmt *format = &mt9t001->format; + struct v4l2_rect *crop = &mt9t001->crop; + unsigned int hratio; + unsigned int vratio; + int ret; + + if (!enable) + return mt9t001_set_output_control(mt9t001, mode, 0); + + /* Configure the window size and row/column bin */ + hratio = DIV_ROUND_CLOSEST(crop->width, format->width); + vratio = DIV_ROUND_CLOSEST(crop->height, format->height); + + ret = mt9t001_write(client, MT9T001_ROW_ADDRESS_MODE, hratio - 1); + if (ret < 0) + return ret; + + ret = mt9t001_write(client, MT9T001_COLUMN_ADDRESS_MODE, vratio - 1); + if (ret < 0) + return ret; + + ret = mt9t001_write(client, MT9T001_COLUMN_START, crop->left); + if (ret < 0) + return ret; + + ret = mt9t001_write(client, MT9T001_ROW_START, crop->top); + if (ret < 0) + return ret; + + ret = mt9t001_write(client, MT9T001_WINDOW_WIDTH, crop->width - 1); + if (ret < 0) + return ret; + + ret = mt9t001_write(client, MT9T001_WINDOW_HEIGHT, crop->height - 1); + if (ret < 0) + return ret; + + /* Switch to master "normal" mode */ + return mt9t001_set_output_control(mt9t001, 0, mode); +} + +static int mt9t001_enum_mbus_code(struct v4l2_subdev *subdev, + struct v4l2_subdev_fh *fh, + struct v4l2_subdev_mbus_code_enum *code) +{ + if (code->index > 0) + return -EINVAL; + + code->code = V4L2_MBUS_FMT_SGRBG10_1X10; + return 0; +} + +static int mt9t001_enum_frame_size(struct v4l2_subdev *subdev, + struct v4l2_subdev_fh *fh, + struct v4l2_subdev_frame_size_enum *fse) +{ + if (fse->index >= 8 || fse->code != V4L2_MBUS_FMT_SGRBG10_1X10) + return -EINVAL; + + fse->min_width = (MT9T001_WINDOW_WIDTH_DEF + 1) / fse->index; + fse->max_width = fse->min_width; + fse->min_height = (MT9T001_WINDOW_HEIGHT_DEF + 1) / fse->index; + fse->max_height = fse->min_height; + + return 0; +} + +static int mt9t001_get_format(struct v4l2_subdev *subdev, + struct v4l2_subdev_fh *fh, + struct v4l2_subdev_format *format) +{ + struct mt9t001 *mt9t001 = to_mt9t001(subdev); + + format->format = *__mt9t001_get_pad_format(mt9t001, fh, format->pad, + format->which); + return 0; +} + +static int mt9t001_set_format(struct v4l2_subdev *subdev, + struct v4l2_subdev_fh *fh, + struct v4l2_subdev_format *format) +{ + struct mt9t001 *mt9t001 = to_mt9t001(subdev); + struct v4l2_mbus_framefmt *__format; + struct v4l2_rect *__crop; + unsigned int width; + unsigned int height; + unsigned int hratio; + unsigned int vratio; + + __crop = __mt9t001_get_pad_crop(mt9t001, fh, format->pad, + format->which); + + /* Clamp the width and height to avoid dividing by zero. */ + width = clamp_t(unsigned int, ALIGN(format->format.width, 2), + max(__crop->width / 8, MT9T001_WINDOW_HEIGHT_MIN + 1), + __crop->width); + height = clamp_t(unsigned int, ALIGN(format->format.height, 2), + max(__crop->height / 8, MT9T001_WINDOW_HEIGHT_MIN + 1), + __crop->height); + + hratio = DIV_ROUND_CLOSEST(__crop->width, width); + vratio = DIV_ROUND_CLOSEST(__crop->height, height); + + __format = __mt9t001_get_pad_format(mt9t001, fh, format->pad, + format->which); + __format->width = __crop->width / hratio; + __format->height = __crop->height / vratio; + + format->format = *__format; + + return 0; +} + +static int mt9t001_get_crop(struct v4l2_subdev *subdev, + struct v4l2_subdev_fh *fh, + struct v4l2_subdev_crop *crop) +{ + struct mt9t001 *mt9t001 = to_mt9t001(subdev); + + crop->rect = *__mt9t001_get_pad_crop(mt9t001, fh, crop->pad, + crop->which); + return 0; +} + +static int mt9t001_set_crop(struct v4l2_subdev *subdev, + struct v4l2_subdev_fh *fh, + struct v4l2_subdev_crop *crop) +{ + struct mt9t001 *mt9t001 = to_mt9t001(subdev); + struct v4l2_mbus_framefmt *__format; + struct v4l2_rect *__crop; + struct v4l2_rect rect; + + /* Clamp the crop rectangle boundaries and align them to a multiple of 2 + * pixels. + */ + rect.left = clamp(ALIGN(crop->rect.left, 2), + MT9T001_COLUMN_START_MIN, + MT9T001_COLUMN_START_MAX); + rect.top = clamp(ALIGN(crop->rect.top, 2), + MT9T001_ROW_START_MIN, + MT9T001_ROW_START_MAX); + rect.width = clamp(ALIGN(crop->rect.width, 2), + MT9T001_WINDOW_WIDTH_MIN + 1, + MT9T001_WINDOW_WIDTH_MAX + 1); + rect.height = clamp(ALIGN(crop->rect.height, 2), + MT9T001_WINDOW_HEIGHT_MIN + 1, + MT9T001_WINDOW_HEIGHT_MAX + 1); + + rect.width = min(rect.width, MT9T001_PIXEL_ARRAY_WIDTH - rect.left); + rect.height = min(rect.height, MT9T001_PIXEL_ARRAY_HEIGHT - rect.top); + + __crop = __mt9t001_get_pad_crop(mt9t001, fh, crop->pad, crop->which); + + if (rect.width != __crop->width || rect.height != __crop->height) { + /* Reset the output image size if the crop rectangle size has + * been modified. + */ + __format = __mt9t001_get_pad_format(mt9t001, fh, crop->pad, + crop->which); + __format->width = rect.width; + __format->height = rect.height; + } + + *__crop = rect; + crop->rect = rect; + + return 0; +} + +/* ----------------------------------------------------------------------------- + * V4L2 subdev control operations + */ + +#define V4L2_CID_TEST_PATTERN (V4L2_CID_USER_BASE | 0x1001) +#define V4L2_CID_BLACK_LEVEL_AUTO (V4L2_CID_USER_BASE | 0x1002) +#define V4L2_CID_BLACK_LEVEL_OFFSET (V4L2_CID_USER_BASE | 0x1003) +#define V4L2_CID_BLACK_LEVEL_CALIBRATE (V4L2_CID_USER_BASE | 0x1004) + +#define V4L2_CID_GAIN_RED (V4L2_CTRL_CLASS_CAMERA | 0x1001) +#define V4L2_CID_GAIN_GREEN_RED (V4L2_CTRL_CLASS_CAMERA | 0x1002) +#define V4L2_CID_GAIN_GREEN_BLUE (V4L2_CTRL_CLASS_CAMERA | 0x1003) +#define V4L2_CID_GAIN_BLUE (V4L2_CTRL_CLASS_CAMERA | 0x1004) + +static u16 mt9t001_gain_value(s32 *gain) +{ + /* Gain is controlled by 2 analog stages and a digital stage. Valid + * values for the 3 stages are + * + * Stage Min Max Step + * ------------------------------------------ + * First analog stage x1 x2 1 + * Second analog stage x1 x4 0.125 + * Digital stage x1 x16 0.125 + * + * To minimize noise, the gain stages should be used in the second + * analog stage, first analog stage, digital stage order. Gain from a + * previous stage should be pushed to its maximum value before the next + * stage is used. + */ + if (*gain <= 32) + return *gain; + + if (*gain <= 64) { + *gain &= ~1; + return (1 << 6) | (*gain >> 1); + } + + *gain &= ~7; + return ((*gain - 64) << 5) | (1 << 6) | 32; +} + +static int mt9t001_ctrl_freeze(struct mt9t001 *mt9t001, bool freeze) +{ + return mt9t001_set_output_control(mt9t001, + freeze ? 0 : MT9T001_OUTPUT_CONTROL_SYNC, + freeze ? MT9T001_OUTPUT_CONTROL_SYNC : 0); +} + +static int mt9t001_s_ctrl(struct v4l2_ctrl *ctrl) +{ + static const u8 gains[4] = { + MT9T001_RED_GAIN, MT9T001_GREEN1_GAIN, + MT9T001_GREEN2_GAIN, MT9T001_BLUE_GAIN + }; + + struct mt9t001 *mt9t001 = + container_of(ctrl->handler, struct mt9t001, ctrls); + struct i2c_client *client = v4l2_get_subdevdata(&mt9t001->subdev); + unsigned int count; + unsigned int i; + u16 value; + int ret; + + switch (ctrl->id) { + case V4L2_CID_GAIN_RED: + case V4L2_CID_GAIN_GREEN_RED: + case V4L2_CID_GAIN_GREEN_BLUE: + case V4L2_CID_GAIN_BLUE: + + /* Disable control updates if more than one control has changed + * in the cluster. + */ + for (i = 0, count = 0; i < 4; ++i) { + struct v4l2_ctrl *gain = mt9t001->gains[i]; + + if (gain->val != gain->cur.val) + count++; + } + + if (count > 1) { + ret = mt9t001_ctrl_freeze(mt9t001, true); + if (ret < 0) + return ret; + } + + /* Update the gain controls. */ + for (i = 0; i < 4; ++i) { + struct v4l2_ctrl *gain = mt9t001->gains[i]; + + if (gain->val == gain->cur.val) + continue; + + value = mt9t001_gain_value(&gain->val); + ret = mt9t001_write(client, gains[i], value); + if (ret < 0) { + mt9t001_ctrl_freeze(mt9t001, false); + return ret; + } + } + + /* Enable control updates. */ + if (count > 1) { + ret = mt9t001_ctrl_freeze(mt9t001, false); + if (ret < 0) + return ret; + } + + break; + + case V4L2_CID_EXPOSURE: + ret = mt9t001_write(client, MT9T001_SHUTTER_WIDTH_LOW, + ctrl->val & 0xffff); + if (ret < 0) + return ret; + + return mt9t001_write(client, MT9T001_SHUTTER_WIDTH_HIGH, + ctrl->val >> 16); + + case V4L2_CID_TEST_PATTERN: + ret = mt9t001_set_output_control(mt9t001, + ctrl->val ? 0 : MT9T001_OUTPUT_CONTROL_TEST_DATA, + ctrl->val ? MT9T001_OUTPUT_CONTROL_TEST_DATA : 0); + if (ret < 0) + return ret; + + return mt9t001_write(client, MT9T001_TEST_DATA, ctrl->val << 2); + + case V4L2_CID_BLACK_LEVEL_AUTO: + value = ctrl->val ? 0 : MT9T001_BLACK_LEVEL_OVERRIDE; + ret = mt9t001_write(client, MT9T001_BLACK_LEVEL_CALIBRATION, + value); + if (ret < 0) + return ret; + + mt9t001->black_level = value; + break; + + case V4L2_CID_BLACK_LEVEL_OFFSET: + ret = mt9t001_write(client, MT9T001_GREEN1_OFFSET, ctrl->val); + if (ret < 0) + return ret; + + ret = mt9t001_write(client, MT9T001_GREEN2_OFFSET, ctrl->val); + if (ret < 0) + return ret; + + ret = mt9t001_write(client, MT9T001_RED_OFFSET, ctrl->val); + if (ret < 0) + return ret; + + return mt9t001_write(client, MT9T001_BLUE_OFFSET, ctrl->val); + + case V4L2_CID_BLACK_LEVEL_CALIBRATE: + return mt9t001_write(client, MT9T001_BLACK_LEVEL_CALIBRATION, + MT9T001_BLACK_LEVEL_RECALCULATE | + mt9t001->black_level); + } + + return 0; +} + +static struct v4l2_ctrl_ops mt9t001_ctrl_ops = { + .s_ctrl = mt9t001_s_ctrl, +}; + +static const struct v4l2_ctrl_config mt9t001_ctrls[] = { + { + .ops = &mt9t001_ctrl_ops, + .id = V4L2_CID_TEST_PATTERN, + .type = V4L2_CTRL_TYPE_INTEGER, + .name = "Test pattern", + .min = 0, + .max = 1023, + .step = 1, + .def = 0, + .flags = 0, + }, { + .ops = &mt9t001_ctrl_ops, + .id = V4L2_CID_BLACK_LEVEL_AUTO, + .type = V4L2_CTRL_TYPE_BOOLEAN, + .name = "Black Level, Auto", + .min = 0, + .max = 1, + .step = 1, + .def = 1, + .flags = 0, + }, { + .ops = &mt9t001_ctrl_ops, + .id = V4L2_CID_BLACK_LEVEL_OFFSET, + .type = V4L2_CTRL_TYPE_INTEGER, + .name = "Black Level, Offset", + .min = -256, + .max = 255, + .step = 1, + .def = 32, + .flags = 0, + }, { + .ops = &mt9t001_ctrl_ops, + .id = V4L2_CID_BLACK_LEVEL_CALIBRATE, + .type = V4L2_CTRL_TYPE_BUTTON, + .name = "Black Level, Calibrate", + .min = 0, + .max = 0, + .step = 0, + .def = 0, + .flags = V4L2_CTRL_FLAG_WRITE_ONLY, + }, +}; + +static const struct v4l2_ctrl_config mt9t001_gains[] = { + { + .ops = &mt9t001_ctrl_ops, + .id = V4L2_CID_GAIN_RED, + .type = V4L2_CTRL_TYPE_INTEGER, + .name = "Gain, Red", + .min = MT9T001_GLOBAL_GAIN_MIN, + .max = MT9T001_GLOBAL_GAIN_MAX, + .step = 1, + .def = MT9T001_GLOBAL_GAIN_MIN, + .flags = 0, + }, { + .ops = &mt9t001_ctrl_ops, + .id = V4L2_CID_GAIN_GREEN_RED, + .type = V4L2_CTRL_TYPE_INTEGER, + .name = "Gain, Green (R)", + .min = MT9T001_GLOBAL_GAIN_MIN, + .max = MT9T001_GLOBAL_GAIN_MAX, + .step = 1, + .def = MT9T001_GLOBAL_GAIN_MIN, + .flags = 0, + }, { + .ops = &mt9t001_ctrl_ops, + .id = V4L2_CID_GAIN_GREEN_BLUE, + .type = V4L2_CTRL_TYPE_INTEGER, + .name = "Gain, Green (B)", + .min = MT9T001_GLOBAL_GAIN_MIN, + .max = MT9T001_GLOBAL_GAIN_MAX, + .step = 1, + .def = MT9T001_GLOBAL_GAIN_MIN, + .flags = 0, + }, { + .ops = &mt9t001_ctrl_ops, + .id = V4L2_CID_GAIN_BLUE, + .type = V4L2_CTRL_TYPE_INTEGER, + .name = "Gain, Blue", + .min = MT9T001_GLOBAL_GAIN_MIN, + .max = MT9T001_GLOBAL_GAIN_MAX, + .step = 1, + .def = MT9T001_GLOBAL_GAIN_MIN, + .flags = 0, + }, +}; + +/* ----------------------------------------------------------------------------- + * V4L2 subdev internal operations + */ + +static int mt9t001_open(struct v4l2_subdev *subdev, struct v4l2_subdev_fh *fh) +{ + struct v4l2_mbus_framefmt *format; + struct v4l2_rect *crop; + + crop = v4l2_subdev_get_try_crop(fh, 0); + crop->left = MT9T001_COLUMN_START_DEF; + crop->top = MT9T001_ROW_START_DEF; + crop->width = MT9T001_WINDOW_WIDTH_DEF + 1; + crop->height = MT9T001_WINDOW_HEIGHT_DEF + 1; + + format = v4l2_subdev_get_try_format(fh, 0); + format->code = V4L2_MBUS_FMT_SGRBG10_1X10; + format->width = MT9T001_WINDOW_WIDTH_DEF + 1; + format->height = MT9T001_WINDOW_HEIGHT_DEF + 1; + format->field = V4L2_FIELD_NONE; + format->colorspace = V4L2_COLORSPACE_SRGB; + + return 0; +} + +static struct v4l2_subdev_video_ops mt9t001_subdev_video_ops = { + .s_stream = mt9t001_s_stream, +}; + +static struct v4l2_subdev_pad_ops mt9t001_subdev_pad_ops = { + .enum_mbus_code = mt9t001_enum_mbus_code, + .enum_frame_size = mt9t001_enum_frame_size, + .get_fmt = mt9t001_get_format, + .set_fmt = mt9t001_set_format, + .get_crop = mt9t001_get_crop, + .set_crop = mt9t001_set_crop, +}; + +static struct v4l2_subdev_ops mt9t001_subdev_ops = { + .video = &mt9t001_subdev_video_ops, + .pad = &mt9t001_subdev_pad_ops, +}; + +static struct v4l2_subdev_internal_ops mt9t001_subdev_internal_ops = { + .open = mt9t001_open, +}; + +static int mt9t001_video_probe(struct i2c_client *client) +{ + struct mt9t001_platform_data *pdata = client->dev.platform_data; + s32 data; + int ret; + + dev_info(&client->dev, "Probing MT9T001 at address 0x%02x\n", + client->addr); + + /* Reset the chip and stop data read out */ + ret = mt9t001_write(client, MT9T001_RESET, 1); + if (ret < 0) + return ret; + + ret = mt9t001_write(client, MT9T001_RESET, 0); + if (ret < 0) + return ret; + + ret = mt9t001_write(client, MT9T001_OUTPUT_CONTROL, 0); + if (ret < 0) + return ret; + + /* Configure the pixel clock polarity */ + if (pdata->clk_pol) { + ret = mt9t001_write(client, MT9T001_PIXEL_CLOCK, + MT9T001_PIXEL_CLOCK_INVERT); + if (ret < 0) + return ret; + } + + /* Read and check the sensor version */ + data = mt9t001_read(client, MT9T001_CHIP_VERSION); + if (data != MT9T001_CHIP_ID) { + dev_err(&client->dev, "MT9T001 not detected, wrong version " + "0x%04x\n", data); + return -ENODEV; + } + + dev_info(&client->dev, "MT9T001 detected at address 0x%02x\n", + client->addr); + + return ret; +} + +static int mt9t001_probe(struct i2c_client *client, + const struct i2c_device_id *did) +{ + struct mt9t001_platform_data *pdata = client->dev.platform_data; + struct mt9t001 *mt9t001; + unsigned int i; + int ret; + + if (pdata == NULL) { + dev_err(&client->dev, "No platform data\n"); + return -EINVAL; + } + + if (!i2c_check_functionality(client->adapter, + I2C_FUNC_SMBUS_WORD_DATA)) { + dev_warn(&client->adapter->dev, + "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n"); + return -EIO; + } + + ret = mt9t001_video_probe(client); + if (ret < 0) + return ret; + + mt9t001 = kzalloc(sizeof(*mt9t001), GFP_KERNEL); + if (!mt9t001) + return -ENOMEM; + + v4l2_ctrl_handler_init(&mt9t001->ctrls, ARRAY_SIZE(mt9t001_ctrls) + + ARRAY_SIZE(mt9t001_gains) + 3); + + v4l2_ctrl_new_std(&mt9t001->ctrls, &mt9t001_ctrl_ops, + V4L2_CID_EXPOSURE, MT9T001_SHUTTER_WIDTH_MIN, + MT9T001_SHUTTER_WIDTH_MAX, 1, + MT9T001_SHUTTER_WIDTH_DEF); + v4l2_ctrl_new_std(&mt9t001->ctrls, &mt9t001_ctrl_ops, + V4L2_CID_BLACK_LEVEL, 1, 1, 1, 1); + v4l2_ctrl_new_std(&mt9t001->ctrls, &mt9t001_ctrl_ops, + V4L2_CID_PIXEL_RATE, pdata->ext_clk, pdata->ext_clk, + 1, pdata->ext_clk); + + for (i = 0; i < ARRAY_SIZE(mt9t001_ctrls); ++i) + v4l2_ctrl_new_custom(&mt9t001->ctrls, &mt9t001_ctrls[i], NULL); + + for (i = 0; i < ARRAY_SIZE(mt9t001_gains); ++i) + mt9t001->gains[i] = v4l2_ctrl_new_custom(&mt9t001->ctrls, + &mt9t001_gains[i], NULL); + + v4l2_ctrl_cluster(ARRAY_SIZE(mt9t001_gains), mt9t001->gains); + + mt9t001->subdev.ctrl_handler = &mt9t001->ctrls; + + if (mt9t001->ctrls.error) { + printk(KERN_INFO "%s: control initialization error %d\n", + __func__, mt9t001->ctrls.error); + ret = -EINVAL; + goto done; + } + + mt9t001->crop.left = MT9T001_COLUMN_START_DEF; + mt9t001->crop.top = MT9T001_ROW_START_DEF; + mt9t001->crop.width = MT9T001_WINDOW_WIDTH_DEF + 1; + mt9t001->crop.height = MT9T001_WINDOW_HEIGHT_DEF + 1; + + mt9t001->format.code = V4L2_MBUS_FMT_SGRBG10_1X10; + mt9t001->format.width = MT9T001_WINDOW_WIDTH_DEF + 1; + mt9t001->format.height = MT9T001_WINDOW_HEIGHT_DEF + 1; + mt9t001->format.field = V4L2_FIELD_NONE; + mt9t001->format.colorspace = V4L2_COLORSPACE_SRGB; + + v4l2_i2c_subdev_init(&mt9t001->subdev, client, &mt9t001_subdev_ops); + mt9t001->subdev.internal_ops = &mt9t001_subdev_internal_ops; + mt9t001->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE; + + mt9t001->pad.flags = MEDIA_PAD_FL_SOURCE; + ret = media_entity_init(&mt9t001->subdev.entity, 1, &mt9t001->pad, 0); + +done: + if (ret < 0) { + v4l2_ctrl_handler_free(&mt9t001->ctrls); + media_entity_cleanup(&mt9t001->subdev.entity); + kfree(mt9t001); + } + + return ret; +} + +static int mt9t001_remove(struct i2c_client *client) +{ + struct v4l2_subdev *subdev = i2c_get_clientdata(client); + struct mt9t001 *mt9t001 = to_mt9t001(subdev); + + v4l2_ctrl_handler_free(&mt9t001->ctrls); + v4l2_device_unregister_subdev(subdev); + media_entity_cleanup(&subdev->entity); + kfree(mt9t001); + return 0; +} + +static const struct i2c_device_id mt9t001_id[] = { + { "mt9t001", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, mt9t001_id); + +static struct i2c_driver mt9t001_driver = { + .driver = { + .name = "mt9t001", + }, + .probe = mt9t001_probe, + .remove = mt9t001_remove, + .id_table = mt9t001_id, +}; + +module_i2c_driver(mt9t001_driver); + +MODULE_DESCRIPTION("Aptina (Micron) MT9T001 Camera driver"); +MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>"); +MODULE_LICENSE("GPL"); |