2 * Driver for MT9T031 CMOS Image Sensor from Micron
4 * Copyright (C) 2008, Guennadi Liakhovetski, DENX Software Engineering <lg@denx.de>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
11 #include <linux/device.h>
12 #include <linux/i2c.h>
13 #include <linux/log2.h>
15 #include <linux/slab.h>
16 #include <linux/v4l2-mediabus.h>
17 #include <linux/videodev2.h>
18 #include <linux/module.h>
20 #include <media/soc_camera.h>
21 #include <media/v4l2-clk.h>
22 #include <media/v4l2-subdev.h>
23 #include <media/v4l2-ctrls.h>
26 * ATTENTION: this driver still cannot be used outside of the soc-camera
27 * framework because of its PM implementation, using the video_device node.
28 * If hardware becomes available for testing, alternative PM approaches shall
29 * be considered and tested.
33 * mt9t031 i2c address 0x5d
34 * The platform has to define struct i2c_board_info objects and link to them
35 * from struct soc_camera_host_desc
38 /* mt9t031 selected register addresses */
39 #define MT9T031_CHIP_VERSION 0x00
40 #define MT9T031_ROW_START 0x01
41 #define MT9T031_COLUMN_START 0x02
42 #define MT9T031_WINDOW_HEIGHT 0x03
43 #define MT9T031_WINDOW_WIDTH 0x04
44 #define MT9T031_HORIZONTAL_BLANKING 0x05
45 #define MT9T031_VERTICAL_BLANKING 0x06
46 #define MT9T031_OUTPUT_CONTROL 0x07
47 #define MT9T031_SHUTTER_WIDTH_UPPER 0x08
48 #define MT9T031_SHUTTER_WIDTH 0x09
49 #define MT9T031_PIXEL_CLOCK_CONTROL 0x0a
50 #define MT9T031_FRAME_RESTART 0x0b
51 #define MT9T031_SHUTTER_DELAY 0x0c
52 #define MT9T031_RESET 0x0d
53 #define MT9T031_READ_MODE_1 0x1e
54 #define MT9T031_READ_MODE_2 0x20
55 #define MT9T031_READ_MODE_3 0x21
56 #define MT9T031_ROW_ADDRESS_MODE 0x22
57 #define MT9T031_COLUMN_ADDRESS_MODE 0x23
58 #define MT9T031_GLOBAL_GAIN 0x35
59 #define MT9T031_CHIP_ENABLE 0xF8
61 #define MT9T031_MAX_HEIGHT 1536
62 #define MT9T031_MAX_WIDTH 2048
63 #define MT9T031_MIN_HEIGHT 2
64 #define MT9T031_MIN_WIDTH 18
65 #define MT9T031_HORIZONTAL_BLANK 142
66 #define MT9T031_VERTICAL_BLANK 25
67 #define MT9T031_COLUMN_SKIP 32
68 #define MT9T031_ROW_SKIP 20
71 struct v4l2_subdev subdev;
72 struct v4l2_ctrl_handler hdl;
74 /* exposure/auto-exposure cluster */
75 struct v4l2_ctrl *autoexposure;
76 struct v4l2_ctrl *exposure;
78 struct v4l2_rect rect; /* Sensor window */
83 unsigned short y_skip_top; /* Lines to skip at the top */
86 static struct mt9t031 *to_mt9t031(const struct i2c_client *client)
88 return container_of(i2c_get_clientdata(client), struct mt9t031, subdev);
91 static int reg_read(struct i2c_client *client, const u8 reg)
93 return i2c_smbus_read_word_swapped(client, reg);
96 static int reg_write(struct i2c_client *client, const u8 reg,
99 return i2c_smbus_write_word_swapped(client, reg, data);
102 static int reg_set(struct i2c_client *client, const u8 reg,
107 ret = reg_read(client, reg);
110 return reg_write(client, reg, ret | data);
113 static int reg_clear(struct i2c_client *client, const u8 reg,
118 ret = reg_read(client, reg);
121 return reg_write(client, reg, ret & ~data);
124 static int set_shutter(struct i2c_client *client, const u32 data)
128 ret = reg_write(client, MT9T031_SHUTTER_WIDTH_UPPER, data >> 16);
131 ret = reg_write(client, MT9T031_SHUTTER_WIDTH, data & 0xffff);
136 static int get_shutter(struct i2c_client *client, u32 *data)
140 ret = reg_read(client, MT9T031_SHUTTER_WIDTH_UPPER);
144 ret = reg_read(client, MT9T031_SHUTTER_WIDTH);
145 *data |= ret & 0xffff;
147 return ret < 0 ? ret : 0;
150 static int mt9t031_idle(struct i2c_client *client)
154 /* Disable chip output, synchronous option update */
155 ret = reg_write(client, MT9T031_RESET, 1);
157 ret = reg_write(client, MT9T031_RESET, 0);
159 ret = reg_clear(client, MT9T031_OUTPUT_CONTROL, 2);
161 return ret >= 0 ? 0 : -EIO;
164 static int mt9t031_s_stream(struct v4l2_subdev *sd, int enable)
166 struct i2c_client *client = v4l2_get_subdevdata(sd);
170 /* Switch to master "normal" mode */
171 ret = reg_set(client, MT9T031_OUTPUT_CONTROL, 2);
173 /* Stop sensor readout */
174 ret = reg_clear(client, MT9T031_OUTPUT_CONTROL, 2);
182 /* target must be _even_ */
183 static u16 mt9t031_skip(s32 *source, s32 target, s32 max)
187 if (*source < target + target / 2) {
192 skip = min(max, *source + target / 2) / target;
195 *source = target * skip;
200 /* rect is the sensor rectangle, the caller guarantees parameter validity */
201 static int mt9t031_set_params(struct i2c_client *client,
202 struct v4l2_rect *rect, u16 xskip, u16 yskip)
204 struct mt9t031 *mt9t031 = to_mt9t031(client);
207 const u16 hblank = MT9T031_HORIZONTAL_BLANK,
208 vblank = MT9T031_VERTICAL_BLANK;
210 xbin = min(xskip, (u16)3);
211 ybin = min(yskip, (u16)3);
214 * Could just do roundup(rect->left, [xy]bin * 2); but this is cheaper.
215 * There is always a valid suitably aligned value. The worst case is
216 * xbin = 3, width = 2048. Then we will start at 36, the last read out
217 * pixel will be 2083, which is < 2085 - first black pixel.
219 * MT9T031 datasheet imposes window left border alignment, depending on
220 * the selected xskip. Failing to conform to this requirement produces
221 * dark horizontal stripes in the image. However, even obeying to this
222 * requirement doesn't eliminate the stripes in all configurations. They
223 * appear "locally reproducibly," but can differ between tests under
224 * different lighting conditions.
234 rect->left = rect->left > roundup(MT9T031_COLUMN_SKIP, 6) ?
235 (rect->left / 6) * 6 : roundup(MT9T031_COLUMN_SKIP, 6);
240 dev_dbg(&client->dev, "skip %u:%u, rect %ux%u@%u:%u\n",
241 xskip, yskip, rect->width, rect->height, rect->left, rect->top);
243 /* Disable register update, reconfigure atomically */
244 ret = reg_set(client, MT9T031_OUTPUT_CONTROL, 1);
248 /* Blanking and start values - default... */
249 ret = reg_write(client, MT9T031_HORIZONTAL_BLANKING, hblank);
251 ret = reg_write(client, MT9T031_VERTICAL_BLANKING, vblank);
253 if (yskip != mt9t031->yskip || xskip != mt9t031->xskip) {
254 /* Binning, skipping */
256 ret = reg_write(client, MT9T031_COLUMN_ADDRESS_MODE,
257 ((xbin - 1) << 4) | (xskip - 1));
259 ret = reg_write(client, MT9T031_ROW_ADDRESS_MODE,
260 ((ybin - 1) << 4) | (yskip - 1));
262 dev_dbg(&client->dev, "new physical left %u, top %u\n",
263 rect->left, rect->top);
266 * The caller provides a supported format, as guaranteed by
267 * .set_fmt(FORMAT_TRY), soc_camera_s_selection() and soc_camera_cropcap()
270 ret = reg_write(client, MT9T031_COLUMN_START, rect->left);
272 ret = reg_write(client, MT9T031_ROW_START, rect->top);
274 ret = reg_write(client, MT9T031_WINDOW_WIDTH, rect->width - 1);
276 ret = reg_write(client, MT9T031_WINDOW_HEIGHT,
277 rect->height + mt9t031->y_skip_top - 1);
278 if (ret >= 0 && v4l2_ctrl_g_ctrl(mt9t031->autoexposure) == V4L2_EXPOSURE_AUTO) {
279 mt9t031->total_h = rect->height + mt9t031->y_skip_top + vblank;
281 ret = set_shutter(client, mt9t031->total_h);
284 /* Re-enable register update, commit all changes */
286 ret = reg_clear(client, MT9T031_OUTPUT_CONTROL, 1);
289 mt9t031->rect = *rect;
290 mt9t031->xskip = xskip;
291 mt9t031->yskip = yskip;
294 return ret < 0 ? ret : 0;
297 static int mt9t031_set_selection(struct v4l2_subdev *sd,
298 struct v4l2_subdev_pad_config *cfg,
299 struct v4l2_subdev_selection *sel)
301 struct i2c_client *client = v4l2_get_subdevdata(sd);
302 struct mt9t031 *mt9t031 = to_mt9t031(client);
303 struct v4l2_rect rect = sel->r;
305 if (sel->which != V4L2_SUBDEV_FORMAT_ACTIVE ||
306 sel->target != V4L2_SEL_TGT_CROP)
309 rect.width = ALIGN(rect.width, 2);
310 rect.height = ALIGN(rect.height, 2);
312 soc_camera_limit_side(&rect.left, &rect.width,
313 MT9T031_COLUMN_SKIP, MT9T031_MIN_WIDTH, MT9T031_MAX_WIDTH);
315 soc_camera_limit_side(&rect.top, &rect.height,
316 MT9T031_ROW_SKIP, MT9T031_MIN_HEIGHT, MT9T031_MAX_HEIGHT);
318 return mt9t031_set_params(client, &rect, mt9t031->xskip, mt9t031->yskip);
321 static int mt9t031_get_selection(struct v4l2_subdev *sd,
322 struct v4l2_subdev_pad_config *cfg,
323 struct v4l2_subdev_selection *sel)
325 struct i2c_client *client = v4l2_get_subdevdata(sd);
326 struct mt9t031 *mt9t031 = to_mt9t031(client);
328 if (sel->which != V4L2_SUBDEV_FORMAT_ACTIVE)
331 switch (sel->target) {
332 case V4L2_SEL_TGT_CROP_BOUNDS:
333 sel->r.left = MT9T031_COLUMN_SKIP;
334 sel->r.top = MT9T031_ROW_SKIP;
335 sel->r.width = MT9T031_MAX_WIDTH;
336 sel->r.height = MT9T031_MAX_HEIGHT;
338 case V4L2_SEL_TGT_CROP:
339 sel->r = mt9t031->rect;
346 static int mt9t031_get_fmt(struct v4l2_subdev *sd,
347 struct v4l2_subdev_pad_config *cfg,
348 struct v4l2_subdev_format *format)
350 struct v4l2_mbus_framefmt *mf = &format->format;
351 struct i2c_client *client = v4l2_get_subdevdata(sd);
352 struct mt9t031 *mt9t031 = to_mt9t031(client);
357 mf->width = mt9t031->rect.width / mt9t031->xskip;
358 mf->height = mt9t031->rect.height / mt9t031->yskip;
359 mf->code = MEDIA_BUS_FMT_SBGGR10_1X10;
360 mf->colorspace = V4L2_COLORSPACE_SRGB;
361 mf->field = V4L2_FIELD_NONE;
367 * If a user window larger than sensor window is requested, we'll increase the
370 static int mt9t031_set_fmt(struct v4l2_subdev *sd,
371 struct v4l2_subdev_pad_config *cfg,
372 struct v4l2_subdev_format *format)
374 struct v4l2_mbus_framefmt *mf = &format->format;
375 struct i2c_client *client = v4l2_get_subdevdata(sd);
376 struct mt9t031 *mt9t031 = to_mt9t031(client);
378 struct v4l2_rect rect = mt9t031->rect;
383 mf->code = MEDIA_BUS_FMT_SBGGR10_1X10;
384 mf->colorspace = V4L2_COLORSPACE_SRGB;
385 v4l_bound_align_image(
386 &mf->width, MT9T031_MIN_WIDTH, MT9T031_MAX_WIDTH, 1,
387 &mf->height, MT9T031_MIN_HEIGHT, MT9T031_MAX_HEIGHT, 1, 0);
389 if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
395 * Width and height are within limits.
396 * S_FMT: use binning and skipping for scaling
398 xskip = mt9t031_skip(&rect.width, mf->width, MT9T031_MAX_WIDTH);
399 yskip = mt9t031_skip(&rect.height, mf->height, MT9T031_MAX_HEIGHT);
401 mf->code = MEDIA_BUS_FMT_SBGGR10_1X10;
402 mf->colorspace = V4L2_COLORSPACE_SRGB;
404 /* mt9t031_set_params() doesn't change width and height */
405 return mt9t031_set_params(client, &rect, xskip, yskip);
408 #ifdef CONFIG_VIDEO_ADV_DEBUG
409 static int mt9t031_g_register(struct v4l2_subdev *sd,
410 struct v4l2_dbg_register *reg)
412 struct i2c_client *client = v4l2_get_subdevdata(sd);
418 reg->val = reg_read(client, reg->reg);
420 if (reg->val > 0xffff)
426 static int mt9t031_s_register(struct v4l2_subdev *sd,
427 const struct v4l2_dbg_register *reg)
429 struct i2c_client *client = v4l2_get_subdevdata(sd);
434 if (reg_write(client, reg->reg, reg->val) < 0)
441 static int mt9t031_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
443 struct mt9t031 *mt9t031 = container_of(ctrl->handler,
444 struct mt9t031, hdl);
445 const u32 shutter_max = MT9T031_MAX_HEIGHT + MT9T031_VERTICAL_BLANK;
449 case V4L2_CID_EXPOSURE_AUTO:
450 min = mt9t031->exposure->minimum;
451 max = mt9t031->exposure->maximum;
452 mt9t031->exposure->val =
453 (shutter_max / 2 + (mt9t031->total_h - 1) * (max - min))
460 static int mt9t031_s_ctrl(struct v4l2_ctrl *ctrl)
462 struct mt9t031 *mt9t031 = container_of(ctrl->handler,
463 struct mt9t031, hdl);
464 struct v4l2_subdev *sd = &mt9t031->subdev;
465 struct i2c_client *client = v4l2_get_subdevdata(sd);
466 struct v4l2_ctrl *exp = mt9t031->exposure;
472 data = reg_set(client, MT9T031_READ_MODE_2, 0x8000);
474 data = reg_clear(client, MT9T031_READ_MODE_2, 0x8000);
480 data = reg_set(client, MT9T031_READ_MODE_2, 0x4000);
482 data = reg_clear(client, MT9T031_READ_MODE_2, 0x4000);
487 /* See Datasheet Table 7, Gain settings. */
488 if (ctrl->val <= ctrl->default_value) {
489 /* Pack it into 0..1 step 0.125, register values 0..8 */
490 unsigned long range = ctrl->default_value - ctrl->minimum;
491 data = ((ctrl->val - (s32)ctrl->minimum) * 8 + range / 2) / range;
493 dev_dbg(&client->dev, "Setting gain %d\n", data);
494 data = reg_write(client, MT9T031_GLOBAL_GAIN, data);
498 /* Pack it into 1.125..128 variable step, register values 9..0x7860 */
499 /* We assume qctrl->maximum - qctrl->default_value - 1 > 0 */
500 unsigned long range = ctrl->maximum - ctrl->default_value - 1;
501 /* calculated gain: map 65..127 to 9..1024 step 0.125 */
502 unsigned long gain = ((ctrl->val - (s32)ctrl->default_value - 1) *
503 1015 + range / 2) / range + 9;
505 if (gain <= 32) /* calculated gain 9..32 -> 9..32 */
507 else if (gain <= 64) /* calculated gain 33..64 -> 0x51..0x60 */
508 data = ((gain - 32) * 16 + 16) / 32 + 80;
510 /* calculated gain 65..1024 -> (1..120) << 8 + 0x60 */
511 data = (((gain - 64 + 7) * 32) & 0xff00) | 0x60;
513 dev_dbg(&client->dev, "Set gain from 0x%x to 0x%x\n",
514 reg_read(client, MT9T031_GLOBAL_GAIN), data);
515 data = reg_write(client, MT9T031_GLOBAL_GAIN, data);
521 case V4L2_CID_EXPOSURE_AUTO:
522 if (ctrl->val == V4L2_EXPOSURE_MANUAL) {
523 unsigned int range = exp->maximum - exp->minimum;
524 unsigned int shutter = ((exp->val - (s32)exp->minimum) * 1048 +
525 range / 2) / range + 1;
528 get_shutter(client, &old);
529 dev_dbg(&client->dev, "Set shutter from %u to %u\n",
531 if (set_shutter(client, shutter) < 0)
534 const u16 vblank = MT9T031_VERTICAL_BLANK;
535 mt9t031->total_h = mt9t031->rect.height +
536 mt9t031->y_skip_top + vblank;
538 if (set_shutter(client, mt9t031->total_h) < 0)
550 * This function does nothing for now but must be present for pm to work
552 static int mt9t031_runtime_suspend(struct device *dev)
559 * COLUMN_ADDRESS_MODE and ROW_ADDRESS_MODE are not rewritten if unchanged
560 * they are however changed at reset if the platform hook is present
561 * thus we rewrite them with the values stored by the driver
563 static int mt9t031_runtime_resume(struct device *dev)
565 struct video_device *vdev = to_video_device(dev);
566 struct v4l2_subdev *sd = soc_camera_vdev_to_subdev(vdev);
567 struct i2c_client *client = v4l2_get_subdevdata(sd);
568 struct mt9t031 *mt9t031 = to_mt9t031(client);
573 xbin = min(mt9t031->xskip, (u16)3);
574 ybin = min(mt9t031->yskip, (u16)3);
576 ret = reg_write(client, MT9T031_COLUMN_ADDRESS_MODE,
577 ((xbin - 1) << 4) | (mt9t031->xskip - 1));
581 ret = reg_write(client, MT9T031_ROW_ADDRESS_MODE,
582 ((ybin - 1) << 4) | (mt9t031->yskip - 1));
589 static const struct dev_pm_ops mt9t031_dev_pm_ops = {
590 .runtime_suspend = mt9t031_runtime_suspend,
591 .runtime_resume = mt9t031_runtime_resume,
594 static const struct device_type mt9t031_dev_type = {
596 .pm = &mt9t031_dev_pm_ops,
599 static int mt9t031_s_power(struct v4l2_subdev *sd, int on)
601 struct i2c_client *client = v4l2_get_subdevdata(sd);
602 struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client);
603 struct video_device *vdev = soc_camera_i2c_to_vdev(client);
604 struct mt9t031 *mt9t031 = to_mt9t031(client);
608 ret = soc_camera_power_on(&client->dev, ssdd, mt9t031->clk);
612 /* Not needed during probing, when vdev isn't available yet */
613 vdev->dev.type = &mt9t031_dev_type;
616 vdev->dev.type = NULL;
617 soc_camera_power_off(&client->dev, ssdd, mt9t031->clk);
624 * Interface active, can use i2c. If it fails, it can indeed mean, that
625 * this wasn't our capture interface, so, we wait for the right one
627 static int mt9t031_video_probe(struct i2c_client *client)
629 struct mt9t031 *mt9t031 = to_mt9t031(client);
633 ret = mt9t031_s_power(&mt9t031->subdev, 1);
637 ret = mt9t031_idle(client);
639 dev_err(&client->dev, "Failed to initialise the camera\n");
643 /* Read out the chip version register */
644 data = reg_read(client, MT9T031_CHIP_VERSION);
650 dev_err(&client->dev,
651 "No MT9T031 chip detected, register read %x\n", data);
656 dev_info(&client->dev, "Detected a MT9T031 chip ID %x\n", data);
658 ret = v4l2_ctrl_handler_setup(&mt9t031->hdl);
661 mt9t031_s_power(&mt9t031->subdev, 0);
666 static int mt9t031_g_skip_top_lines(struct v4l2_subdev *sd, u32 *lines)
668 struct i2c_client *client = v4l2_get_subdevdata(sd);
669 struct mt9t031 *mt9t031 = to_mt9t031(client);
671 *lines = mt9t031->y_skip_top;
676 static const struct v4l2_ctrl_ops mt9t031_ctrl_ops = {
677 .g_volatile_ctrl = mt9t031_g_volatile_ctrl,
678 .s_ctrl = mt9t031_s_ctrl,
681 static const struct v4l2_subdev_core_ops mt9t031_subdev_core_ops = {
682 .s_power = mt9t031_s_power,
683 #ifdef CONFIG_VIDEO_ADV_DEBUG
684 .g_register = mt9t031_g_register,
685 .s_register = mt9t031_s_register,
689 static int mt9t031_enum_mbus_code(struct v4l2_subdev *sd,
690 struct v4l2_subdev_pad_config *cfg,
691 struct v4l2_subdev_mbus_code_enum *code)
693 if (code->pad || code->index)
696 code->code = MEDIA_BUS_FMT_SBGGR10_1X10;
700 static int mt9t031_g_mbus_config(struct v4l2_subdev *sd,
701 struct v4l2_mbus_config *cfg)
703 struct i2c_client *client = v4l2_get_subdevdata(sd);
704 struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client);
706 cfg->flags = V4L2_MBUS_MASTER | V4L2_MBUS_PCLK_SAMPLE_RISING |
707 V4L2_MBUS_PCLK_SAMPLE_FALLING | V4L2_MBUS_HSYNC_ACTIVE_HIGH |
708 V4L2_MBUS_VSYNC_ACTIVE_HIGH | V4L2_MBUS_DATA_ACTIVE_HIGH;
709 cfg->type = V4L2_MBUS_PARALLEL;
710 cfg->flags = soc_camera_apply_board_flags(ssdd, cfg);
715 static int mt9t031_s_mbus_config(struct v4l2_subdev *sd,
716 const struct v4l2_mbus_config *cfg)
718 struct i2c_client *client = v4l2_get_subdevdata(sd);
719 struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client);
721 if (soc_camera_apply_board_flags(ssdd, cfg) &
722 V4L2_MBUS_PCLK_SAMPLE_FALLING)
723 return reg_clear(client, MT9T031_PIXEL_CLOCK_CONTROL, 0x8000);
725 return reg_set(client, MT9T031_PIXEL_CLOCK_CONTROL, 0x8000);
728 static const struct v4l2_subdev_video_ops mt9t031_subdev_video_ops = {
729 .s_stream = mt9t031_s_stream,
730 .g_mbus_config = mt9t031_g_mbus_config,
731 .s_mbus_config = mt9t031_s_mbus_config,
734 static const struct v4l2_subdev_sensor_ops mt9t031_subdev_sensor_ops = {
735 .g_skip_top_lines = mt9t031_g_skip_top_lines,
738 static const struct v4l2_subdev_pad_ops mt9t031_subdev_pad_ops = {
739 .enum_mbus_code = mt9t031_enum_mbus_code,
740 .get_selection = mt9t031_get_selection,
741 .set_selection = mt9t031_set_selection,
742 .get_fmt = mt9t031_get_fmt,
743 .set_fmt = mt9t031_set_fmt,
746 static const struct v4l2_subdev_ops mt9t031_subdev_ops = {
747 .core = &mt9t031_subdev_core_ops,
748 .video = &mt9t031_subdev_video_ops,
749 .sensor = &mt9t031_subdev_sensor_ops,
750 .pad = &mt9t031_subdev_pad_ops,
753 static int mt9t031_probe(struct i2c_client *client,
754 const struct i2c_device_id *did)
756 struct mt9t031 *mt9t031;
757 struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client);
758 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
762 dev_err(&client->dev, "MT9T031 driver needs platform data\n");
766 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
767 dev_warn(&adapter->dev,
768 "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
772 mt9t031 = devm_kzalloc(&client->dev, sizeof(struct mt9t031), GFP_KERNEL);
776 v4l2_i2c_subdev_init(&mt9t031->subdev, client, &mt9t031_subdev_ops);
777 v4l2_ctrl_handler_init(&mt9t031->hdl, 5);
778 v4l2_ctrl_new_std(&mt9t031->hdl, &mt9t031_ctrl_ops,
779 V4L2_CID_VFLIP, 0, 1, 1, 0);
780 v4l2_ctrl_new_std(&mt9t031->hdl, &mt9t031_ctrl_ops,
781 V4L2_CID_HFLIP, 0, 1, 1, 0);
782 v4l2_ctrl_new_std(&mt9t031->hdl, &mt9t031_ctrl_ops,
783 V4L2_CID_GAIN, 0, 127, 1, 64);
786 * Simulated autoexposure. If enabled, we calculate shutter width
787 * ourselves in the driver based on vertical blanking and frame width
789 mt9t031->autoexposure = v4l2_ctrl_new_std_menu(&mt9t031->hdl,
790 &mt9t031_ctrl_ops, V4L2_CID_EXPOSURE_AUTO, 1, 0,
792 mt9t031->exposure = v4l2_ctrl_new_std(&mt9t031->hdl, &mt9t031_ctrl_ops,
793 V4L2_CID_EXPOSURE, 1, 255, 1, 255);
795 mt9t031->subdev.ctrl_handler = &mt9t031->hdl;
796 if (mt9t031->hdl.error)
797 return mt9t031->hdl.error;
799 v4l2_ctrl_auto_cluster(2, &mt9t031->autoexposure,
800 V4L2_EXPOSURE_MANUAL, true);
802 mt9t031->y_skip_top = 0;
803 mt9t031->rect.left = MT9T031_COLUMN_SKIP;
804 mt9t031->rect.top = MT9T031_ROW_SKIP;
805 mt9t031->rect.width = MT9T031_MAX_WIDTH;
806 mt9t031->rect.height = MT9T031_MAX_HEIGHT;
811 mt9t031->clk = v4l2_clk_get(&client->dev, "mclk");
812 if (IS_ERR(mt9t031->clk)) {
813 ret = PTR_ERR(mt9t031->clk);
817 ret = mt9t031_video_probe(client);
819 v4l2_clk_put(mt9t031->clk);
821 v4l2_ctrl_handler_free(&mt9t031->hdl);
827 static int mt9t031_remove(struct i2c_client *client)
829 struct mt9t031 *mt9t031 = to_mt9t031(client);
831 v4l2_clk_put(mt9t031->clk);
832 v4l2_device_unregister_subdev(&mt9t031->subdev);
833 v4l2_ctrl_handler_free(&mt9t031->hdl);
838 static const struct i2c_device_id mt9t031_id[] = {
842 MODULE_DEVICE_TABLE(i2c, mt9t031_id);
844 static struct i2c_driver mt9t031_i2c_driver = {
848 .probe = mt9t031_probe,
849 .remove = mt9t031_remove,
850 .id_table = mt9t031_id,
853 module_i2c_driver(mt9t031_i2c_driver);
855 MODULE_DESCRIPTION("Micron MT9T031 Camera driver");
856 MODULE_AUTHOR("Guennadi Liakhovetski <lg@denx.de>");
857 MODULE_LICENSE("GPL v2");