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Avoid beyond bounds copy while caching ACL
[zen-stable.git] / drivers / media / video / mt9t031.c
blob84add1aef13955941a1969d7dabec019148d7a51
1 /*
2 * Driver for MT9T031 CMOS Image Sensor from Micron
3 *
4 * Copyright (C) 2008, Guennadi Liakhovetski, DENX Software Engineering <lg@denx.de>
5 *
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.
9 */
10
11 #include <linux/device.h>
12 #include <linux/i2c.h>
13 #include <linux/log2.h>
14 #include <linux/pm.h>
15 #include <linux/slab.h>
16 #include <linux/v4l2-mediabus.h>
17 #include <linux/videodev2.h>
18 #include <linux/module.h>
19
20 #include <media/soc_camera.h>
21 #include <media/v4l2-chip-ident.h>
22 #include <media/v4l2-subdev.h>
23 #include <media/v4l2-ctrls.h>
24
25 /*
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.
30 */
31
32 /*
33 * mt9t031 i2c address 0x5d
34 * The platform has to define i2c_board_info and link to it from
35 * struct soc_camera_link
36 */
37
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
60
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
69
70 struct mt9t031 {
71 struct v4l2_subdev subdev;
72 struct v4l2_ctrl_handler hdl;
73 struct {
74 /* exposure/auto-exposure cluster */
75 struct v4l2_ctrl *autoexposure;
76 struct v4l2_ctrl *exposure;
77 };
78 struct v4l2_rect rect; /* Sensor window */
79 int model; /* V4L2_IDENT_MT9T031* codes from v4l2-chip-ident.h */
80 u16 xskip;
81 u16 yskip;
82 unsigned int total_h;
83 unsigned short y_skip_top; /* Lines to skip at the top */
84 };
85
86 static struct mt9t031 *to_mt9t031(const struct i2c_client *client)
87 {
88 return container_of(i2c_get_clientdata(client), struct mt9t031, subdev);
89 }
90
91 static int reg_read(struct i2c_client *client, const u8 reg)
92 {
93 return i2c_smbus_read_word_swapped(client, reg);
94 }
95
96 static int reg_write(struct i2c_client *client, const u8 reg,
97 const u16 data)
98 {
99 return i2c_smbus_write_word_swapped(client, reg, data);
100 }
101
102 static int reg_set(struct i2c_client *client, const u8 reg,
103 const u16 data)
104 {
105 int ret;
106
107 ret = reg_read(client, reg);
108 if (ret < 0)
109 return ret;
110 return reg_write(client, reg, ret | data);
111 }
112
113 static int reg_clear(struct i2c_client *client, const u8 reg,
114 const u16 data)
115 {
116 int ret;
117
118 ret = reg_read(client, reg);
119 if (ret < 0)
120 return ret;
121 return reg_write(client, reg, ret & ~data);
122 }
123
124 static int set_shutter(struct i2c_client *client, const u32 data)
125 {
126 int ret;
127
128 ret = reg_write(client, MT9T031_SHUTTER_WIDTH_UPPER, data >> 16);
129
130 if (ret >= 0)
131 ret = reg_write(client, MT9T031_SHUTTER_WIDTH, data & 0xffff);
132
133 return ret;
134 }
135
136 static int get_shutter(struct i2c_client *client, u32 *data)
137 {
138 int ret;
139
140 ret = reg_read(client, MT9T031_SHUTTER_WIDTH_UPPER);
141 *data = ret << 16;
142
143 if (ret >= 0)
144 ret = reg_read(client, MT9T031_SHUTTER_WIDTH);
145 *data |= ret & 0xffff;
146
147 return ret < 0 ? ret : 0;
148 }
149
150 static int mt9t031_idle(struct i2c_client *client)
151 {
152 int ret;
153
154 /* Disable chip output, synchronous option update */
155 ret = reg_write(client, MT9T031_RESET, 1);
156 if (ret >= 0)
157 ret = reg_write(client, MT9T031_RESET, 0);
158 if (ret >= 0)
159 ret = reg_clear(client, MT9T031_OUTPUT_CONTROL, 2);
160
161 return ret >= 0 ? 0 : -EIO;
162 }
163
164 static int mt9t031_disable(struct i2c_client *client)
165 {
166 /* Disable the chip */
167 reg_clear(client, MT9T031_OUTPUT_CONTROL, 2);
168
169 return 0;
170 }
171
172 static int mt9t031_s_stream(struct v4l2_subdev *sd, int enable)
173 {
174 struct i2c_client *client = v4l2_get_subdevdata(sd);
175 int ret;
176
177 if (enable)
178 /* Switch to master "normal" mode */
179 ret = reg_set(client, MT9T031_OUTPUT_CONTROL, 2);
180 else
181 /* Stop sensor readout */
182 ret = reg_clear(client, MT9T031_OUTPUT_CONTROL, 2);
183
184 if (ret < 0)
185 return -EIO;
186
187 return 0;
188 }
189
190 /* target must be _even_ */
191 static u16 mt9t031_skip(s32 *source, s32 target, s32 max)
192 {
193 unsigned int skip;
194
195 if (*source < target + target / 2) {
196 *source = target;
197 return 1;
198 }
199
200 skip = min(max, *source + target / 2) / target;
201 if (skip > 8)
202 skip = 8;
203 *source = target * skip;
204
205 return skip;
206 }
207
208 /* rect is the sensor rectangle, the caller guarantees parameter validity */
209 static int mt9t031_set_params(struct i2c_client *client,
210 struct v4l2_rect *rect, u16 xskip, u16 yskip)
211 {
212 struct mt9t031 *mt9t031 = to_mt9t031(client);
213 int ret;
214 u16 xbin, ybin;
215 const u16 hblank = MT9T031_HORIZONTAL_BLANK,
216 vblank = MT9T031_VERTICAL_BLANK;
217
218 xbin = min(xskip, (u16)3);
219 ybin = min(yskip, (u16)3);
220
221 /*
222 * Could just do roundup(rect->left, [xy]bin * 2); but this is cheaper.
223 * There is always a valid suitably aligned value. The worst case is
224 * xbin = 3, width = 2048. Then we will start at 36, the last read out
225 * pixel will be 2083, which is < 2085 - first black pixel.
226 *
227 * MT9T031 datasheet imposes window left border alignment, depending on
228 * the selected xskip. Failing to conform to this requirement produces
229 * dark horizontal stripes in the image. However, even obeying to this
230 * requirement doesn't eliminate the stripes in all configurations. They
231 * appear "locally reproducibly," but can differ between tests under
232 * different lighting conditions.
233 */
234 switch (xbin) {
235 case 1:
236 rect->left &= ~1;
237 break;
238 case 2:
239 rect->left &= ~3;
240 break;
241 case 3:
242 rect->left = rect->left > roundup(MT9T031_COLUMN_SKIP, 6) ?
243 (rect->left / 6) * 6 : roundup(MT9T031_COLUMN_SKIP, 6);
244 }
245
246 rect->top &= ~1;
247
248 dev_dbg(&client->dev, "skip %u:%u, rect %ux%u@%u:%u\n",
249 xskip, yskip, rect->width, rect->height, rect->left, rect->top);
250
251 /* Disable register update, reconfigure atomically */
252 ret = reg_set(client, MT9T031_OUTPUT_CONTROL, 1);
253 if (ret < 0)
254 return ret;
255
256 /* Blanking and start values - default... */
257 ret = reg_write(client, MT9T031_HORIZONTAL_BLANKING, hblank);
258 if (ret >= 0)
259 ret = reg_write(client, MT9T031_VERTICAL_BLANKING, vblank);
260
261 if (yskip != mt9t031->yskip || xskip != mt9t031->xskip) {
262 /* Binning, skipping */
263 if (ret >= 0)
264 ret = reg_write(client, MT9T031_COLUMN_ADDRESS_MODE,
265 ((xbin - 1) << 4) | (xskip - 1));
266 if (ret >= 0)
267 ret = reg_write(client, MT9T031_ROW_ADDRESS_MODE,
268 ((ybin - 1) << 4) | (yskip - 1));
269 }
270 dev_dbg(&client->dev, "new physical left %u, top %u\n",
271 rect->left, rect->top);
272
273 /*
274 * The caller provides a supported format, as guaranteed by
275 * .try_mbus_fmt(), soc_camera_s_crop() and soc_camera_cropcap()
276 */
277 if (ret >= 0)
278 ret = reg_write(client, MT9T031_COLUMN_START, rect->left);
279 if (ret >= 0)
280 ret = reg_write(client, MT9T031_ROW_START, rect->top);
281 if (ret >= 0)
282 ret = reg_write(client, MT9T031_WINDOW_WIDTH, rect->width - 1);
283 if (ret >= 0)
284 ret = reg_write(client, MT9T031_WINDOW_HEIGHT,
285 rect->height + mt9t031->y_skip_top - 1);
286 if (ret >= 0 && v4l2_ctrl_g_ctrl(mt9t031->autoexposure) == V4L2_EXPOSURE_AUTO) {
287 mt9t031->total_h = rect->height + mt9t031->y_skip_top + vblank;
288
289 ret = set_shutter(client, mt9t031->total_h);
290 }
291
292 /* Re-enable register update, commit all changes */
293 if (ret >= 0)
294 ret = reg_clear(client, MT9T031_OUTPUT_CONTROL, 1);
295
296 if (ret >= 0) {
297 mt9t031->rect = *rect;
298 mt9t031->xskip = xskip;
299 mt9t031->yskip = yskip;
300 }
301
302 return ret < 0 ? ret : 0;
303 }
304
305 static int mt9t031_s_crop(struct v4l2_subdev *sd, struct v4l2_crop *a)
306 {
307 struct v4l2_rect rect = a->c;
308 struct i2c_client *client = v4l2_get_subdevdata(sd);
309 struct mt9t031 *mt9t031 = to_mt9t031(client);
310
311 rect.width = ALIGN(rect.width, 2);
312 rect.height = ALIGN(rect.height, 2);
313
314 soc_camera_limit_side(&rect.left, &rect.width,
315 MT9T031_COLUMN_SKIP, MT9T031_MIN_WIDTH, MT9T031_MAX_WIDTH);
316
317 soc_camera_limit_side(&rect.top, &rect.height,
318 MT9T031_ROW_SKIP, MT9T031_MIN_HEIGHT, MT9T031_MAX_HEIGHT);
319
320 return mt9t031_set_params(client, &rect, mt9t031->xskip, mt9t031->yskip);
321 }
322
323 static int mt9t031_g_crop(struct v4l2_subdev *sd, struct v4l2_crop *a)
324 {
325 struct i2c_client *client = v4l2_get_subdevdata(sd);
326 struct mt9t031 *mt9t031 = to_mt9t031(client);
327
328 a->c = mt9t031->rect;
329 a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
330
331 return 0;
332 }
333
334 static int mt9t031_cropcap(struct v4l2_subdev *sd, struct v4l2_cropcap *a)
335 {
336 a->bounds.left = MT9T031_COLUMN_SKIP;
337 a->bounds.top = MT9T031_ROW_SKIP;
338 a->bounds.width = MT9T031_MAX_WIDTH;
339 a->bounds.height = MT9T031_MAX_HEIGHT;
340 a->defrect = a->bounds;
341 a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
342 a->pixelaspect.numerator = 1;
343 a->pixelaspect.denominator = 1;
344
345 return 0;
346 }
347
348 static int mt9t031_g_fmt(struct v4l2_subdev *sd,
349 struct v4l2_mbus_framefmt *mf)
350 {
351 struct i2c_client *client = v4l2_get_subdevdata(sd);
352 struct mt9t031 *mt9t031 = to_mt9t031(client);
353
354 mf->width = mt9t031->rect.width / mt9t031->xskip;
355 mf->height = mt9t031->rect.height / mt9t031->yskip;
356 mf->code = V4L2_MBUS_FMT_SBGGR10_1X10;
357 mf->colorspace = V4L2_COLORSPACE_SRGB;
358 mf->field = V4L2_FIELD_NONE;
359
360 return 0;
361 }
362
363 static int mt9t031_s_fmt(struct v4l2_subdev *sd,
364 struct v4l2_mbus_framefmt *mf)
365 {
366 struct i2c_client *client = v4l2_get_subdevdata(sd);
367 struct mt9t031 *mt9t031 = to_mt9t031(client);
368 u16 xskip, yskip;
369 struct v4l2_rect rect = mt9t031->rect;
370
371 /*
372 * try_fmt has put width and height within limits.
373 * S_FMT: use binning and skipping for scaling
374 */
375 xskip = mt9t031_skip(&rect.width, mf->width, MT9T031_MAX_WIDTH);
376 yskip = mt9t031_skip(&rect.height, mf->height, MT9T031_MAX_HEIGHT);
377
378 mf->code = V4L2_MBUS_FMT_SBGGR10_1X10;
379 mf->colorspace = V4L2_COLORSPACE_SRGB;
380
381 /* mt9t031_set_params() doesn't change width and height */
382 return mt9t031_set_params(client, &rect, xskip, yskip);
383 }
384
385 /*
386 * If a user window larger than sensor window is requested, we'll increase the
387 * sensor window.
388 */
389 static int mt9t031_try_fmt(struct v4l2_subdev *sd,
390 struct v4l2_mbus_framefmt *mf)
391 {
392 v4l_bound_align_image(
393 &mf->width, MT9T031_MIN_WIDTH, MT9T031_MAX_WIDTH, 1,
394 &mf->height, MT9T031_MIN_HEIGHT, MT9T031_MAX_HEIGHT, 1, 0);
395
396 mf->code = V4L2_MBUS_FMT_SBGGR10_1X10;
397 mf->colorspace = V4L2_COLORSPACE_SRGB;
398
399 return 0;
400 }
401
402 static int mt9t031_g_chip_ident(struct v4l2_subdev *sd,
403 struct v4l2_dbg_chip_ident *id)
404 {
405 struct i2c_client *client = v4l2_get_subdevdata(sd);
406 struct mt9t031 *mt9t031 = to_mt9t031(client);
407
408 if (id->match.type != V4L2_CHIP_MATCH_I2C_ADDR)
409 return -EINVAL;
410
411 if (id->match.addr != client->addr)
412 return -ENODEV;
413
414 id->ident = mt9t031->model;
415 id->revision = 0;
416
417 return 0;
418 }
419
420 #ifdef CONFIG_VIDEO_ADV_DEBUG
421 static int mt9t031_g_register(struct v4l2_subdev *sd,
422 struct v4l2_dbg_register *reg)
423 {
424 struct i2c_client *client = v4l2_get_subdevdata(sd);
425
426 if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
427 return -EINVAL;
428
429 if (reg->match.addr != client->addr)
430 return -ENODEV;
431
432 reg->val = reg_read(client, reg->reg);
433
434 if (reg->val > 0xffff)
435 return -EIO;
436
437 return 0;
438 }
439
440 static int mt9t031_s_register(struct v4l2_subdev *sd,
441 struct v4l2_dbg_register *reg)
442 {
443 struct i2c_client *client = v4l2_get_subdevdata(sd);
444
445 if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
446 return -EINVAL;
447
448 if (reg->match.addr != client->addr)
449 return -ENODEV;
450
451 if (reg_write(client, reg->reg, reg->val) < 0)
452 return -EIO;
453
454 return 0;
455 }
456 #endif
457
458 static int mt9t031_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
459 {
460 struct mt9t031 *mt9t031 = container_of(ctrl->handler,
461 struct mt9t031, hdl);
462 const u32 shutter_max = MT9T031_MAX_HEIGHT + MT9T031_VERTICAL_BLANK;
463 s32 min, max;
464
465 switch (ctrl->id) {
466 case V4L2_CID_EXPOSURE_AUTO:
467 min = mt9t031->exposure->minimum;
468 max = mt9t031->exposure->maximum;
469 mt9t031->exposure->val =
470 (shutter_max / 2 + (mt9t031->total_h - 1) * (max - min))
471 / shutter_max + min;
472 break;
473 }
474 return 0;
475 }
476
477 static int mt9t031_s_ctrl(struct v4l2_ctrl *ctrl)
478 {
479 struct mt9t031 *mt9t031 = container_of(ctrl->handler,
480 struct mt9t031, hdl);
481 struct v4l2_subdev *sd = &mt9t031->subdev;
482 struct i2c_client *client = v4l2_get_subdevdata(sd);
483 struct v4l2_ctrl *exp = mt9t031->exposure;
484 int data;
485
486 switch (ctrl->id) {
487 case V4L2_CID_VFLIP:
488 if (ctrl->val)
489 data = reg_set(client, MT9T031_READ_MODE_2, 0x8000);
490 else
491 data = reg_clear(client, MT9T031_READ_MODE_2, 0x8000);
492 if (data < 0)
493 return -EIO;
494 return 0;
495 case V4L2_CID_HFLIP:
496 if (ctrl->val)
497 data = reg_set(client, MT9T031_READ_MODE_2, 0x4000);
498 else
499 data = reg_clear(client, MT9T031_READ_MODE_2, 0x4000);
500 if (data < 0)
501 return -EIO;
502 return 0;
503 case V4L2_CID_GAIN:
504 /* See Datasheet Table 7, Gain settings. */
505 if (ctrl->val <= ctrl->default_value) {
506 /* Pack it into 0..1 step 0.125, register values 0..8 */
507 unsigned long range = ctrl->default_value - ctrl->minimum;
508 data = ((ctrl->val - ctrl->minimum) * 8 + range / 2) / range;
509
510 dev_dbg(&client->dev, "Setting gain %d\n", data);
511 data = reg_write(client, MT9T031_GLOBAL_GAIN, data);
512 if (data < 0)
513 return -EIO;
514 } else {
515 /* Pack it into 1.125..128 variable step, register values 9..0x7860 */
516 /* We assume qctrl->maximum - qctrl->default_value - 1 > 0 */
517 unsigned long range = ctrl->maximum - ctrl->default_value - 1;
518 /* calculated gain: map 65..127 to 9..1024 step 0.125 */
519 unsigned long gain = ((ctrl->val - ctrl->default_value - 1) *
520 1015 + range / 2) / range + 9;
521
522 if (gain <= 32) /* calculated gain 9..32 -> 9..32 */
523 data = gain;
524 else if (gain <= 64) /* calculated gain 33..64 -> 0x51..0x60 */
525 data = ((gain - 32) * 16 + 16) / 32 + 80;
526 else
527 /* calculated gain 65..1024 -> (1..120) << 8 + 0x60 */
528 data = (((gain - 64 + 7) * 32) & 0xff00) | 0x60;
529
530 dev_dbg(&client->dev, "Set gain from 0x%x to 0x%x\n",
531 reg_read(client, MT9T031_GLOBAL_GAIN), data);
532 data = reg_write(client, MT9T031_GLOBAL_GAIN, data);
533 if (data < 0)
534 return -EIO;
535 }
536 return 0;
537
538 case V4L2_CID_EXPOSURE_AUTO:
539 if (ctrl->val == V4L2_EXPOSURE_MANUAL) {
540 unsigned int range = exp->maximum - exp->minimum;
541 unsigned int shutter = ((exp->val - exp->minimum) * 1048 +
542 range / 2) / range + 1;
543 u32 old;
544
545 get_shutter(client, &old);
546 dev_dbg(&client->dev, "Set shutter from %u to %u\n",
547 old, shutter);
548 if (set_shutter(client, shutter) < 0)
549 return -EIO;
550 } else {
551 const u16 vblank = MT9T031_VERTICAL_BLANK;
552 mt9t031->total_h = mt9t031->rect.height +
553 mt9t031->y_skip_top + vblank;
554
555 if (set_shutter(client, mt9t031->total_h) < 0)
556 return -EIO;
557 }
558 return 0;
559 default:
560 return -EINVAL;
561 }
562 return 0;
563 }
564
565 /*
566 * Power Management:
567 * This function does nothing for now but must be present for pm to work
568 */
569 static int mt9t031_runtime_suspend(struct device *dev)
570 {
571 return 0;
572 }
573
574 /*
575 * Power Management:
576 * COLUMN_ADDRESS_MODE and ROW_ADDRESS_MODE are not rewritten if unchanged
577 * they are however changed at reset if the platform hook is present
578 * thus we rewrite them with the values stored by the driver
579 */
580 static int mt9t031_runtime_resume(struct device *dev)
581 {
582 struct video_device *vdev = to_video_device(dev);
583 struct v4l2_subdev *sd = soc_camera_vdev_to_subdev(vdev);
584 struct i2c_client *client = v4l2_get_subdevdata(sd);
585 struct mt9t031 *mt9t031 = to_mt9t031(client);
586
587 int ret;
588 u16 xbin, ybin;
589
590 xbin = min(mt9t031->xskip, (u16)3);
591 ybin = min(mt9t031->yskip, (u16)3);
592
593 ret = reg_write(client, MT9T031_COLUMN_ADDRESS_MODE,
594 ((xbin - 1) << 4) | (mt9t031->xskip - 1));
595 if (ret < 0)
596 return ret;
597
598 ret = reg_write(client, MT9T031_ROW_ADDRESS_MODE,
599 ((ybin - 1) << 4) | (mt9t031->yskip - 1));
600 if (ret < 0)
601 return ret;
602
603 return 0;
604 }
605
606 static struct dev_pm_ops mt9t031_dev_pm_ops = {
607 .runtime_suspend = mt9t031_runtime_suspend,
608 .runtime_resume = mt9t031_runtime_resume,
609 };
610
611 static struct device_type mt9t031_dev_type = {
612 .name = "MT9T031",
613 .pm = &mt9t031_dev_pm_ops,
614 };
615
616 static int mt9t031_s_power(struct v4l2_subdev *sd, int on)
617 {
618 struct i2c_client *client = v4l2_get_subdevdata(sd);
619 struct video_device *vdev = soc_camera_i2c_to_vdev(client);
620
621 if (on)
622 vdev->dev.type = &mt9t031_dev_type;
623 else
624 vdev->dev.type = NULL;
625
626 return 0;
627 }
628
629 /*
630 * Interface active, can use i2c. If it fails, it can indeed mean, that
631 * this wasn't our capture interface, so, we wait for the right one
632 */
633 static int mt9t031_video_probe(struct i2c_client *client)
634 {
635 struct mt9t031 *mt9t031 = to_mt9t031(client);
636 s32 data;
637 int ret;
638
639 /* Enable the chip */
640 data = reg_write(client, MT9T031_CHIP_ENABLE, 1);
641 dev_dbg(&client->dev, "write: %d\n", data);
642
643 /* Read out the chip version register */
644 data = reg_read(client, MT9T031_CHIP_VERSION);
645
646 switch (data) {
647 case 0x1621:
648 mt9t031->model = V4L2_IDENT_MT9T031;
649 break;
650 default:
651 dev_err(&client->dev,
652 "No MT9T031 chip detected, register read %x\n", data);
653 return -ENODEV;
654 }
655
656 dev_info(&client->dev, "Detected a MT9T031 chip ID %x\n", data);
657
658 ret = mt9t031_idle(client);
659 if (ret < 0)
660 dev_err(&client->dev, "Failed to initialise the camera\n");
661 else
662 v4l2_ctrl_handler_setup(&mt9t031->hdl);
663
664 return ret;
665 }
666
667 static int mt9t031_g_skip_top_lines(struct v4l2_subdev *sd, u32 *lines)
668 {
669 struct i2c_client *client = v4l2_get_subdevdata(sd);
670 struct mt9t031 *mt9t031 = to_mt9t031(client);
671
672 *lines = mt9t031->y_skip_top;
673
674 return 0;
675 }
676
677 static const struct v4l2_ctrl_ops mt9t031_ctrl_ops = {
678 .g_volatile_ctrl = mt9t031_g_volatile_ctrl,
679 .s_ctrl = mt9t031_s_ctrl,
680 };
681
682 static struct v4l2_subdev_core_ops mt9t031_subdev_core_ops = {
683 .g_chip_ident = mt9t031_g_chip_ident,
684 .s_power = mt9t031_s_power,
685 #ifdef CONFIG_VIDEO_ADV_DEBUG
686 .g_register = mt9t031_g_register,
687 .s_register = mt9t031_s_register,
688 #endif
689 };
690
691 static int mt9t031_enum_fmt(struct v4l2_subdev *sd, unsigned int index,
692 enum v4l2_mbus_pixelcode *code)
693 {
694 if (index)
695 return -EINVAL;
696
697 *code = V4L2_MBUS_FMT_SBGGR10_1X10;
698 return 0;
699 }
700
701 static int mt9t031_g_mbus_config(struct v4l2_subdev *sd,
702 struct v4l2_mbus_config *cfg)
703 {
704 struct i2c_client *client = v4l2_get_subdevdata(sd);
705 struct soc_camera_link *icl = soc_camera_i2c_to_link(client);
706
707 cfg->flags = V4L2_MBUS_MASTER | V4L2_MBUS_PCLK_SAMPLE_RISING |
708 V4L2_MBUS_PCLK_SAMPLE_FALLING | V4L2_MBUS_HSYNC_ACTIVE_HIGH |
709 V4L2_MBUS_VSYNC_ACTIVE_HIGH | V4L2_MBUS_DATA_ACTIVE_HIGH;
710 cfg->type = V4L2_MBUS_PARALLEL;
711 cfg->flags = soc_camera_apply_board_flags(icl, cfg);
712
713 return 0;
714 }
715
716 static int mt9t031_s_mbus_config(struct v4l2_subdev *sd,
717 const struct v4l2_mbus_config *cfg)
718 {
719 struct i2c_client *client = v4l2_get_subdevdata(sd);
720 struct soc_camera_link *icl = soc_camera_i2c_to_link(client);
721
722 if (soc_camera_apply_board_flags(icl, cfg) &
723 V4L2_MBUS_PCLK_SAMPLE_FALLING)
724 return reg_clear(client, MT9T031_PIXEL_CLOCK_CONTROL, 0x8000);
725 else
726 return reg_set(client, MT9T031_PIXEL_CLOCK_CONTROL, 0x8000);
727 }
728
729 static struct v4l2_subdev_video_ops mt9t031_subdev_video_ops = {
730 .s_stream = mt9t031_s_stream,
731 .s_mbus_fmt = mt9t031_s_fmt,
732 .g_mbus_fmt = mt9t031_g_fmt,
733 .try_mbus_fmt = mt9t031_try_fmt,
734 .s_crop = mt9t031_s_crop,
735 .g_crop = mt9t031_g_crop,
736 .cropcap = mt9t031_cropcap,
737 .enum_mbus_fmt = mt9t031_enum_fmt,
738 .g_mbus_config = mt9t031_g_mbus_config,
739 .s_mbus_config = mt9t031_s_mbus_config,
740 };
741
742 static struct v4l2_subdev_sensor_ops mt9t031_subdev_sensor_ops = {
743 .g_skip_top_lines = mt9t031_g_skip_top_lines,
744 };
745
746 static 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 };
751
752 static int mt9t031_probe(struct i2c_client *client,
753 const struct i2c_device_id *did)
754 {
755 struct mt9t031 *mt9t031;
756 struct soc_camera_link *icl = soc_camera_i2c_to_link(client);
757 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
758 int ret;
759
760 if (!icl) {
761 dev_err(&client->dev, "MT9T031 driver needs platform data\n");
762 return -EINVAL;
763 }
764
765 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
766 dev_warn(&adapter->dev,
767 "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
768 return -EIO;
769 }
770
771 mt9t031 = kzalloc(sizeof(struct mt9t031), GFP_KERNEL);
772 if (!mt9t031)
773 return -ENOMEM;
774
775 v4l2_i2c_subdev_init(&mt9t031->subdev, client, &mt9t031_subdev_ops);
776 v4l2_ctrl_handler_init(&mt9t031->hdl, 5);
777 v4l2_ctrl_new_std(&mt9t031->hdl, &mt9t031_ctrl_ops,
778 V4L2_CID_VFLIP, 0, 1, 1, 0);
779 v4l2_ctrl_new_std(&mt9t031->hdl, &mt9t031_ctrl_ops,
780 V4L2_CID_HFLIP, 0, 1, 1, 0);
781 v4l2_ctrl_new_std(&mt9t031->hdl, &mt9t031_ctrl_ops,
782 V4L2_CID_GAIN, 0, 127, 1, 64);
783
784 /*
785 * Simulated autoexposure. If enabled, we calculate shutter width
786 * ourselves in the driver based on vertical blanking and frame width
787 */
788 mt9t031->autoexposure = v4l2_ctrl_new_std_menu(&mt9t031->hdl,
789 &mt9t031_ctrl_ops, V4L2_CID_EXPOSURE_AUTO, 1, 0,
790 V4L2_EXPOSURE_AUTO);
791 mt9t031->exposure = v4l2_ctrl_new_std(&mt9t031->hdl, &mt9t031_ctrl_ops,
792 V4L2_CID_EXPOSURE, 1, 255, 1, 255);
793
794 mt9t031->subdev.ctrl_handler = &mt9t031->hdl;
795 if (mt9t031->hdl.error) {
796 int err = mt9t031->hdl.error;
797
798 kfree(mt9t031);
799 return err;
800 }
801 v4l2_ctrl_auto_cluster(2, &mt9t031->autoexposure,
802 V4L2_EXPOSURE_MANUAL, true);
803
804 mt9t031->y_skip_top = 0;
805 mt9t031->rect.left = MT9T031_COLUMN_SKIP;
806 mt9t031->rect.top = MT9T031_ROW_SKIP;
807 mt9t031->rect.width = MT9T031_MAX_WIDTH;
808 mt9t031->rect.height = MT9T031_MAX_HEIGHT;
809
810 mt9t031->xskip = 1;
811 mt9t031->yskip = 1;
812
813 mt9t031_idle(client);
814
815 ret = mt9t031_video_probe(client);
816
817 mt9t031_disable(client);
818
819 if (ret) {
820 v4l2_ctrl_handler_free(&mt9t031->hdl);
821 kfree(mt9t031);
822 }
823
824 return ret;
825 }
826
827 static int mt9t031_remove(struct i2c_client *client)
828 {
829 struct mt9t031 *mt9t031 = to_mt9t031(client);
830
831 v4l2_device_unregister_subdev(&mt9t031->subdev);
832 v4l2_ctrl_handler_free(&mt9t031->hdl);
833 kfree(mt9t031);
834
835 return 0;
836 }
837
838 static const struct i2c_device_id mt9t031_id[] = {
839 { "mt9t031", 0 },
840 { }
841 };
842 MODULE_DEVICE_TABLE(i2c, mt9t031_id);
843
844 static struct i2c_driver mt9t031_i2c_driver = {
845 .driver = {
846 .name = "mt9t031",
847 },
848 .probe = mt9t031_probe,
849 .remove = mt9t031_remove,
850 .id_table = mt9t031_id,
851 };
852
853 static int __init mt9t031_mod_init(void)
854 {
855 return i2c_add_driver(&mt9t031_i2c_driver);
856 }
857
858 static void __exit mt9t031_mod_exit(void)
859 {
860 i2c_del_driver(&mt9t031_i2c_driver);
861 }
862
863 module_init(mt9t031_mod_init);
864 module_exit(mt9t031_mod_exit);
865
866 MODULE_DESCRIPTION("Micron MT9T031 Camera driver");
867 MODULE_AUTHOR("Guennadi Liakhovetski <lg@denx.de>");
868 MODULE_LICENSE("GPL v2");