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-clk.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 struct i2c_board_info objects and link to them
35 * from struct soc_camera_host_desc
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 struct v4l2_clk *clk;
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
to_mt9t031(const struct i2c_client * client)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
reg_read(struct i2c_client * client,const u8 reg)91 static int reg_read(struct i2c_client *client, const u8 reg)
92 {
93 return i2c_smbus_read_word_swapped(client, reg);
94 }
95
reg_write(struct i2c_client * client,const u8 reg,const u16 data)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
reg_set(struct i2c_client * client,const u8 reg,const u16 data)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
reg_clear(struct i2c_client * client,const u8 reg,const u16 data)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
set_shutter(struct i2c_client * client,const u32 data)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
get_shutter(struct i2c_client * client,u32 * data)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
mt9t031_idle(struct i2c_client * client)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
mt9t031_s_stream(struct v4l2_subdev * sd,int enable)164 static int mt9t031_s_stream(struct v4l2_subdev *sd, int enable)
165 {
166 struct i2c_client *client = v4l2_get_subdevdata(sd);
167 int ret;
168
169 if (enable)
170 /* Switch to master "normal" mode */
171 ret = reg_set(client, MT9T031_OUTPUT_CONTROL, 2);
172 else
173 /* Stop sensor readout */
174 ret = reg_clear(client, MT9T031_OUTPUT_CONTROL, 2);
175
176 if (ret < 0)
177 return -EIO;
178
179 return 0;
180 }
181
182 /* target must be _even_ */
mt9t031_skip(s32 * source,s32 target,s32 max)183 static u16 mt9t031_skip(s32 *source, s32 target, s32 max)
184 {
185 unsigned int skip;
186
187 if (*source < target + target / 2) {
188 *source = target;
189 return 1;
190 }
191
192 skip = min(max, *source + target / 2) / target;
193 if (skip > 8)
194 skip = 8;
195 *source = target * skip;
196
197 return skip;
198 }
199
200 /* rect is the sensor rectangle, the caller guarantees parameter validity */
mt9t031_set_params(struct i2c_client * client,struct v4l2_rect * rect,u16 xskip,u16 yskip)201 static int mt9t031_set_params(struct i2c_client *client,
202 struct v4l2_rect *rect, u16 xskip, u16 yskip)
203 {
204 struct mt9t031 *mt9t031 = to_mt9t031(client);
205 int ret;
206 u16 xbin, ybin;
207 const u16 hblank = MT9T031_HORIZONTAL_BLANK,
208 vblank = MT9T031_VERTICAL_BLANK;
209
210 xbin = min(xskip, (u16)3);
211 ybin = min(yskip, (u16)3);
212
213 /*
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.
218 *
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.
225 */
226 switch (xbin) {
227 case 1:
228 rect->left &= ~1;
229 break;
230 case 2:
231 rect->left &= ~3;
232 break;
233 case 3:
234 rect->left = rect->left > roundup(MT9T031_COLUMN_SKIP, 6) ?
235 (rect->left / 6) * 6 : roundup(MT9T031_COLUMN_SKIP, 6);
236 }
237
238 rect->top &= ~1;
239
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);
242
243 /* Disable register update, reconfigure atomically */
244 ret = reg_set(client, MT9T031_OUTPUT_CONTROL, 1);
245 if (ret < 0)
246 return ret;
247
248 /* Blanking and start values - default... */
249 ret = reg_write(client, MT9T031_HORIZONTAL_BLANKING, hblank);
250 if (ret >= 0)
251 ret = reg_write(client, MT9T031_VERTICAL_BLANKING, vblank);
252
253 if (yskip != mt9t031->yskip || xskip != mt9t031->xskip) {
254 /* Binning, skipping */
255 if (ret >= 0)
256 ret = reg_write(client, MT9T031_COLUMN_ADDRESS_MODE,
257 ((xbin - 1) << 4) | (xskip - 1));
258 if (ret >= 0)
259 ret = reg_write(client, MT9T031_ROW_ADDRESS_MODE,
260 ((ybin - 1) << 4) | (yskip - 1));
261 }
262 dev_dbg(&client->dev, "new physical left %u, top %u\n",
263 rect->left, rect->top);
264
265 /*
266 * The caller provides a supported format, as guaranteed by
267 * .set_fmt(FORMAT_TRY), soc_camera_s_crop() and soc_camera_cropcap()
268 */
269 if (ret >= 0)
270 ret = reg_write(client, MT9T031_COLUMN_START, rect->left);
271 if (ret >= 0)
272 ret = reg_write(client, MT9T031_ROW_START, rect->top);
273 if (ret >= 0)
274 ret = reg_write(client, MT9T031_WINDOW_WIDTH, rect->width - 1);
275 if (ret >= 0)
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;
280
281 ret = set_shutter(client, mt9t031->total_h);
282 }
283
284 /* Re-enable register update, commit all changes */
285 if (ret >= 0)
286 ret = reg_clear(client, MT9T031_OUTPUT_CONTROL, 1);
287
288 if (ret >= 0) {
289 mt9t031->rect = *rect;
290 mt9t031->xskip = xskip;
291 mt9t031->yskip = yskip;
292 }
293
294 return ret < 0 ? ret : 0;
295 }
296
mt9t031_s_crop(struct v4l2_subdev * sd,const struct v4l2_crop * a)297 static int mt9t031_s_crop(struct v4l2_subdev *sd, const struct v4l2_crop *a)
298 {
299 struct v4l2_rect rect = a->c;
300 struct i2c_client *client = v4l2_get_subdevdata(sd);
301 struct mt9t031 *mt9t031 = to_mt9t031(client);
302
303 rect.width = ALIGN(rect.width, 2);
304 rect.height = ALIGN(rect.height, 2);
305
306 soc_camera_limit_side(&rect.left, &rect.width,
307 MT9T031_COLUMN_SKIP, MT9T031_MIN_WIDTH, MT9T031_MAX_WIDTH);
308
309 soc_camera_limit_side(&rect.top, &rect.height,
310 MT9T031_ROW_SKIP, MT9T031_MIN_HEIGHT, MT9T031_MAX_HEIGHT);
311
312 return mt9t031_set_params(client, &rect, mt9t031->xskip, mt9t031->yskip);
313 }
314
mt9t031_g_crop(struct v4l2_subdev * sd,struct v4l2_crop * a)315 static int mt9t031_g_crop(struct v4l2_subdev *sd, struct v4l2_crop *a)
316 {
317 struct i2c_client *client = v4l2_get_subdevdata(sd);
318 struct mt9t031 *mt9t031 = to_mt9t031(client);
319
320 a->c = mt9t031->rect;
321 a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
322
323 return 0;
324 }
325
mt9t031_cropcap(struct v4l2_subdev * sd,struct v4l2_cropcap * a)326 static int mt9t031_cropcap(struct v4l2_subdev *sd, struct v4l2_cropcap *a)
327 {
328 a->bounds.left = MT9T031_COLUMN_SKIP;
329 a->bounds.top = MT9T031_ROW_SKIP;
330 a->bounds.width = MT9T031_MAX_WIDTH;
331 a->bounds.height = MT9T031_MAX_HEIGHT;
332 a->defrect = a->bounds;
333 a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
334 a->pixelaspect.numerator = 1;
335 a->pixelaspect.denominator = 1;
336
337 return 0;
338 }
339
mt9t031_get_fmt(struct v4l2_subdev * sd,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_format * format)340 static int mt9t031_get_fmt(struct v4l2_subdev *sd,
341 struct v4l2_subdev_pad_config *cfg,
342 struct v4l2_subdev_format *format)
343 {
344 struct v4l2_mbus_framefmt *mf = &format->format;
345 struct i2c_client *client = v4l2_get_subdevdata(sd);
346 struct mt9t031 *mt9t031 = to_mt9t031(client);
347
348 if (format->pad)
349 return -EINVAL;
350
351 mf->width = mt9t031->rect.width / mt9t031->xskip;
352 mf->height = mt9t031->rect.height / mt9t031->yskip;
353 mf->code = MEDIA_BUS_FMT_SBGGR10_1X10;
354 mf->colorspace = V4L2_COLORSPACE_SRGB;
355 mf->field = V4L2_FIELD_NONE;
356
357 return 0;
358 }
359
360 /*
361 * If a user window larger than sensor window is requested, we'll increase the
362 * sensor window.
363 */
mt9t031_set_fmt(struct v4l2_subdev * sd,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_format * format)364 static int mt9t031_set_fmt(struct v4l2_subdev *sd,
365 struct v4l2_subdev_pad_config *cfg,
366 struct v4l2_subdev_format *format)
367 {
368 struct v4l2_mbus_framefmt *mf = &format->format;
369 struct i2c_client *client = v4l2_get_subdevdata(sd);
370 struct mt9t031 *mt9t031 = to_mt9t031(client);
371 u16 xskip, yskip;
372 struct v4l2_rect rect = mt9t031->rect;
373
374 if (format->pad)
375 return -EINVAL;
376
377 mf->code = MEDIA_BUS_FMT_SBGGR10_1X10;
378 mf->colorspace = V4L2_COLORSPACE_SRGB;
379 v4l_bound_align_image(
380 &mf->width, MT9T031_MIN_WIDTH, MT9T031_MAX_WIDTH, 1,
381 &mf->height, MT9T031_MIN_HEIGHT, MT9T031_MAX_HEIGHT, 1, 0);
382
383 if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
384 cfg->try_fmt = *mf;
385 return 0;
386 }
387
388 /*
389 * Width and height are within limits.
390 * S_FMT: use binning and skipping for scaling
391 */
392 xskip = mt9t031_skip(&rect.width, mf->width, MT9T031_MAX_WIDTH);
393 yskip = mt9t031_skip(&rect.height, mf->height, MT9T031_MAX_HEIGHT);
394
395 mf->code = MEDIA_BUS_FMT_SBGGR10_1X10;
396 mf->colorspace = V4L2_COLORSPACE_SRGB;
397
398 /* mt9t031_set_params() doesn't change width and height */
399 return mt9t031_set_params(client, &rect, xskip, yskip);
400 }
401
402 #ifdef CONFIG_VIDEO_ADV_DEBUG
mt9t031_g_register(struct v4l2_subdev * sd,struct v4l2_dbg_register * reg)403 static int mt9t031_g_register(struct v4l2_subdev *sd,
404 struct v4l2_dbg_register *reg)
405 {
406 struct i2c_client *client = v4l2_get_subdevdata(sd);
407
408 if (reg->reg > 0xff)
409 return -EINVAL;
410
411 reg->size = 1;
412 reg->val = reg_read(client, reg->reg);
413
414 if (reg->val > 0xffff)
415 return -EIO;
416
417 return 0;
418 }
419
mt9t031_s_register(struct v4l2_subdev * sd,const struct v4l2_dbg_register * reg)420 static int mt9t031_s_register(struct v4l2_subdev *sd,
421 const struct v4l2_dbg_register *reg)
422 {
423 struct i2c_client *client = v4l2_get_subdevdata(sd);
424
425 if (reg->reg > 0xff)
426 return -EINVAL;
427
428 if (reg_write(client, reg->reg, reg->val) < 0)
429 return -EIO;
430
431 return 0;
432 }
433 #endif
434
mt9t031_g_volatile_ctrl(struct v4l2_ctrl * ctrl)435 static int mt9t031_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
436 {
437 struct mt9t031 *mt9t031 = container_of(ctrl->handler,
438 struct mt9t031, hdl);
439 const u32 shutter_max = MT9T031_MAX_HEIGHT + MT9T031_VERTICAL_BLANK;
440 s32 min, max;
441
442 switch (ctrl->id) {
443 case V4L2_CID_EXPOSURE_AUTO:
444 min = mt9t031->exposure->minimum;
445 max = mt9t031->exposure->maximum;
446 mt9t031->exposure->val =
447 (shutter_max / 2 + (mt9t031->total_h - 1) * (max - min))
448 / shutter_max + min;
449 break;
450 }
451 return 0;
452 }
453
mt9t031_s_ctrl(struct v4l2_ctrl * ctrl)454 static int mt9t031_s_ctrl(struct v4l2_ctrl *ctrl)
455 {
456 struct mt9t031 *mt9t031 = container_of(ctrl->handler,
457 struct mt9t031, hdl);
458 struct v4l2_subdev *sd = &mt9t031->subdev;
459 struct i2c_client *client = v4l2_get_subdevdata(sd);
460 struct v4l2_ctrl *exp = mt9t031->exposure;
461 int data;
462
463 switch (ctrl->id) {
464 case V4L2_CID_VFLIP:
465 if (ctrl->val)
466 data = reg_set(client, MT9T031_READ_MODE_2, 0x8000);
467 else
468 data = reg_clear(client, MT9T031_READ_MODE_2, 0x8000);
469 if (data < 0)
470 return -EIO;
471 return 0;
472 case V4L2_CID_HFLIP:
473 if (ctrl->val)
474 data = reg_set(client, MT9T031_READ_MODE_2, 0x4000);
475 else
476 data = reg_clear(client, MT9T031_READ_MODE_2, 0x4000);
477 if (data < 0)
478 return -EIO;
479 return 0;
480 case V4L2_CID_GAIN:
481 /* See Datasheet Table 7, Gain settings. */
482 if (ctrl->val <= ctrl->default_value) {
483 /* Pack it into 0..1 step 0.125, register values 0..8 */
484 unsigned long range = ctrl->default_value - ctrl->minimum;
485 data = ((ctrl->val - (s32)ctrl->minimum) * 8 + range / 2) / range;
486
487 dev_dbg(&client->dev, "Setting gain %d\n", data);
488 data = reg_write(client, MT9T031_GLOBAL_GAIN, data);
489 if (data < 0)
490 return -EIO;
491 } else {
492 /* Pack it into 1.125..128 variable step, register values 9..0x7860 */
493 /* We assume qctrl->maximum - qctrl->default_value - 1 > 0 */
494 unsigned long range = ctrl->maximum - ctrl->default_value - 1;
495 /* calculated gain: map 65..127 to 9..1024 step 0.125 */
496 unsigned long gain = ((ctrl->val - (s32)ctrl->default_value - 1) *
497 1015 + range / 2) / range + 9;
498
499 if (gain <= 32) /* calculated gain 9..32 -> 9..32 */
500 data = gain;
501 else if (gain <= 64) /* calculated gain 33..64 -> 0x51..0x60 */
502 data = ((gain - 32) * 16 + 16) / 32 + 80;
503 else
504 /* calculated gain 65..1024 -> (1..120) << 8 + 0x60 */
505 data = (((gain - 64 + 7) * 32) & 0xff00) | 0x60;
506
507 dev_dbg(&client->dev, "Set gain from 0x%x to 0x%x\n",
508 reg_read(client, MT9T031_GLOBAL_GAIN), data);
509 data = reg_write(client, MT9T031_GLOBAL_GAIN, data);
510 if (data < 0)
511 return -EIO;
512 }
513 return 0;
514
515 case V4L2_CID_EXPOSURE_AUTO:
516 if (ctrl->val == V4L2_EXPOSURE_MANUAL) {
517 unsigned int range = exp->maximum - exp->minimum;
518 unsigned int shutter = ((exp->val - (s32)exp->minimum) * 1048 +
519 range / 2) / range + 1;
520 u32 old;
521
522 get_shutter(client, &old);
523 dev_dbg(&client->dev, "Set shutter from %u to %u\n",
524 old, shutter);
525 if (set_shutter(client, shutter) < 0)
526 return -EIO;
527 } else {
528 const u16 vblank = MT9T031_VERTICAL_BLANK;
529 mt9t031->total_h = mt9t031->rect.height +
530 mt9t031->y_skip_top + vblank;
531
532 if (set_shutter(client, mt9t031->total_h) < 0)
533 return -EIO;
534 }
535 return 0;
536 default:
537 return -EINVAL;
538 }
539 return 0;
540 }
541
542 /*
543 * Power Management:
544 * This function does nothing for now but must be present for pm to work
545 */
mt9t031_runtime_suspend(struct device * dev)546 static int mt9t031_runtime_suspend(struct device *dev)
547 {
548 return 0;
549 }
550
551 /*
552 * Power Management:
553 * COLUMN_ADDRESS_MODE and ROW_ADDRESS_MODE are not rewritten if unchanged
554 * they are however changed at reset if the platform hook is present
555 * thus we rewrite them with the values stored by the driver
556 */
mt9t031_runtime_resume(struct device * dev)557 static int mt9t031_runtime_resume(struct device *dev)
558 {
559 struct video_device *vdev = to_video_device(dev);
560 struct v4l2_subdev *sd = soc_camera_vdev_to_subdev(vdev);
561 struct i2c_client *client = v4l2_get_subdevdata(sd);
562 struct mt9t031 *mt9t031 = to_mt9t031(client);
563
564 int ret;
565 u16 xbin, ybin;
566
567 xbin = min(mt9t031->xskip, (u16)3);
568 ybin = min(mt9t031->yskip, (u16)3);
569
570 ret = reg_write(client, MT9T031_COLUMN_ADDRESS_MODE,
571 ((xbin - 1) << 4) | (mt9t031->xskip - 1));
572 if (ret < 0)
573 return ret;
574
575 ret = reg_write(client, MT9T031_ROW_ADDRESS_MODE,
576 ((ybin - 1) << 4) | (mt9t031->yskip - 1));
577 if (ret < 0)
578 return ret;
579
580 return 0;
581 }
582
583 static const struct dev_pm_ops mt9t031_dev_pm_ops = {
584 .runtime_suspend = mt9t031_runtime_suspend,
585 .runtime_resume = mt9t031_runtime_resume,
586 };
587
588 static struct device_type mt9t031_dev_type = {
589 .name = "MT9T031",
590 .pm = &mt9t031_dev_pm_ops,
591 };
592
mt9t031_s_power(struct v4l2_subdev * sd,int on)593 static int mt9t031_s_power(struct v4l2_subdev *sd, int on)
594 {
595 struct i2c_client *client = v4l2_get_subdevdata(sd);
596 struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client);
597 struct video_device *vdev = soc_camera_i2c_to_vdev(client);
598 struct mt9t031 *mt9t031 = to_mt9t031(client);
599 int ret;
600
601 if (on) {
602 ret = soc_camera_power_on(&client->dev, ssdd, mt9t031->clk);
603 if (ret < 0)
604 return ret;
605 if (vdev)
606 /* Not needed during probing, when vdev isn't available yet */
607 vdev->dev.type = &mt9t031_dev_type;
608 } else {
609 if (vdev)
610 vdev->dev.type = NULL;
611 soc_camera_power_off(&client->dev, ssdd, mt9t031->clk);
612 }
613
614 return 0;
615 }
616
617 /*
618 * Interface active, can use i2c. If it fails, it can indeed mean, that
619 * this wasn't our capture interface, so, we wait for the right one
620 */
mt9t031_video_probe(struct i2c_client * client)621 static int mt9t031_video_probe(struct i2c_client *client)
622 {
623 struct mt9t031 *mt9t031 = to_mt9t031(client);
624 s32 data;
625 int ret;
626
627 ret = mt9t031_s_power(&mt9t031->subdev, 1);
628 if (ret < 0)
629 return ret;
630
631 ret = mt9t031_idle(client);
632 if (ret < 0) {
633 dev_err(&client->dev, "Failed to initialise the camera\n");
634 goto done;
635 }
636
637 /* Read out the chip version register */
638 data = reg_read(client, MT9T031_CHIP_VERSION);
639
640 switch (data) {
641 case 0x1621:
642 break;
643 default:
644 dev_err(&client->dev,
645 "No MT9T031 chip detected, register read %x\n", data);
646 ret = -ENODEV;
647 goto done;
648 }
649
650 dev_info(&client->dev, "Detected a MT9T031 chip ID %x\n", data);
651
652 ret = v4l2_ctrl_handler_setup(&mt9t031->hdl);
653
654 done:
655 mt9t031_s_power(&mt9t031->subdev, 0);
656
657 return ret;
658 }
659
mt9t031_g_skip_top_lines(struct v4l2_subdev * sd,u32 * lines)660 static int mt9t031_g_skip_top_lines(struct v4l2_subdev *sd, u32 *lines)
661 {
662 struct i2c_client *client = v4l2_get_subdevdata(sd);
663 struct mt9t031 *mt9t031 = to_mt9t031(client);
664
665 *lines = mt9t031->y_skip_top;
666
667 return 0;
668 }
669
670 static const struct v4l2_ctrl_ops mt9t031_ctrl_ops = {
671 .g_volatile_ctrl = mt9t031_g_volatile_ctrl,
672 .s_ctrl = mt9t031_s_ctrl,
673 };
674
675 static struct v4l2_subdev_core_ops mt9t031_subdev_core_ops = {
676 .s_power = mt9t031_s_power,
677 #ifdef CONFIG_VIDEO_ADV_DEBUG
678 .g_register = mt9t031_g_register,
679 .s_register = mt9t031_s_register,
680 #endif
681 };
682
mt9t031_enum_mbus_code(struct v4l2_subdev * sd,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_mbus_code_enum * code)683 static int mt9t031_enum_mbus_code(struct v4l2_subdev *sd,
684 struct v4l2_subdev_pad_config *cfg,
685 struct v4l2_subdev_mbus_code_enum *code)
686 {
687 if (code->pad || code->index)
688 return -EINVAL;
689
690 code->code = MEDIA_BUS_FMT_SBGGR10_1X10;
691 return 0;
692 }
693
mt9t031_g_mbus_config(struct v4l2_subdev * sd,struct v4l2_mbus_config * cfg)694 static int mt9t031_g_mbus_config(struct v4l2_subdev *sd,
695 struct v4l2_mbus_config *cfg)
696 {
697 struct i2c_client *client = v4l2_get_subdevdata(sd);
698 struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client);
699
700 cfg->flags = V4L2_MBUS_MASTER | V4L2_MBUS_PCLK_SAMPLE_RISING |
701 V4L2_MBUS_PCLK_SAMPLE_FALLING | V4L2_MBUS_HSYNC_ACTIVE_HIGH |
702 V4L2_MBUS_VSYNC_ACTIVE_HIGH | V4L2_MBUS_DATA_ACTIVE_HIGH;
703 cfg->type = V4L2_MBUS_PARALLEL;
704 cfg->flags = soc_camera_apply_board_flags(ssdd, cfg);
705
706 return 0;
707 }
708
mt9t031_s_mbus_config(struct v4l2_subdev * sd,const struct v4l2_mbus_config * cfg)709 static int mt9t031_s_mbus_config(struct v4l2_subdev *sd,
710 const struct v4l2_mbus_config *cfg)
711 {
712 struct i2c_client *client = v4l2_get_subdevdata(sd);
713 struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client);
714
715 if (soc_camera_apply_board_flags(ssdd, cfg) &
716 V4L2_MBUS_PCLK_SAMPLE_FALLING)
717 return reg_clear(client, MT9T031_PIXEL_CLOCK_CONTROL, 0x8000);
718 else
719 return reg_set(client, MT9T031_PIXEL_CLOCK_CONTROL, 0x8000);
720 }
721
722 static struct v4l2_subdev_video_ops mt9t031_subdev_video_ops = {
723 .s_stream = mt9t031_s_stream,
724 .s_crop = mt9t031_s_crop,
725 .g_crop = mt9t031_g_crop,
726 .cropcap = mt9t031_cropcap,
727 .g_mbus_config = mt9t031_g_mbus_config,
728 .s_mbus_config = mt9t031_s_mbus_config,
729 };
730
731 static struct v4l2_subdev_sensor_ops mt9t031_subdev_sensor_ops = {
732 .g_skip_top_lines = mt9t031_g_skip_top_lines,
733 };
734
735 static const struct v4l2_subdev_pad_ops mt9t031_subdev_pad_ops = {
736 .enum_mbus_code = mt9t031_enum_mbus_code,
737 .get_fmt = mt9t031_get_fmt,
738 .set_fmt = mt9t031_set_fmt,
739 };
740
741 static struct v4l2_subdev_ops mt9t031_subdev_ops = {
742 .core = &mt9t031_subdev_core_ops,
743 .video = &mt9t031_subdev_video_ops,
744 .sensor = &mt9t031_subdev_sensor_ops,
745 .pad = &mt9t031_subdev_pad_ops,
746 };
747
mt9t031_probe(struct i2c_client * client,const struct i2c_device_id * did)748 static int mt9t031_probe(struct i2c_client *client,
749 const struct i2c_device_id *did)
750 {
751 struct mt9t031 *mt9t031;
752 struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client);
753 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
754 int ret;
755
756 if (!ssdd) {
757 dev_err(&client->dev, "MT9T031 driver needs platform data\n");
758 return -EINVAL;
759 }
760
761 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
762 dev_warn(&adapter->dev,
763 "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
764 return -EIO;
765 }
766
767 mt9t031 = devm_kzalloc(&client->dev, sizeof(struct mt9t031), GFP_KERNEL);
768 if (!mt9t031)
769 return -ENOMEM;
770
771 v4l2_i2c_subdev_init(&mt9t031->subdev, client, &mt9t031_subdev_ops);
772 v4l2_ctrl_handler_init(&mt9t031->hdl, 5);
773 v4l2_ctrl_new_std(&mt9t031->hdl, &mt9t031_ctrl_ops,
774 V4L2_CID_VFLIP, 0, 1, 1, 0);
775 v4l2_ctrl_new_std(&mt9t031->hdl, &mt9t031_ctrl_ops,
776 V4L2_CID_HFLIP, 0, 1, 1, 0);
777 v4l2_ctrl_new_std(&mt9t031->hdl, &mt9t031_ctrl_ops,
778 V4L2_CID_GAIN, 0, 127, 1, 64);
779
780 /*
781 * Simulated autoexposure. If enabled, we calculate shutter width
782 * ourselves in the driver based on vertical blanking and frame width
783 */
784 mt9t031->autoexposure = v4l2_ctrl_new_std_menu(&mt9t031->hdl,
785 &mt9t031_ctrl_ops, V4L2_CID_EXPOSURE_AUTO, 1, 0,
786 V4L2_EXPOSURE_AUTO);
787 mt9t031->exposure = v4l2_ctrl_new_std(&mt9t031->hdl, &mt9t031_ctrl_ops,
788 V4L2_CID_EXPOSURE, 1, 255, 1, 255);
789
790 mt9t031->subdev.ctrl_handler = &mt9t031->hdl;
791 if (mt9t031->hdl.error)
792 return mt9t031->hdl.error;
793
794 v4l2_ctrl_auto_cluster(2, &mt9t031->autoexposure,
795 V4L2_EXPOSURE_MANUAL, true);
796
797 mt9t031->y_skip_top = 0;
798 mt9t031->rect.left = MT9T031_COLUMN_SKIP;
799 mt9t031->rect.top = MT9T031_ROW_SKIP;
800 mt9t031->rect.width = MT9T031_MAX_WIDTH;
801 mt9t031->rect.height = MT9T031_MAX_HEIGHT;
802
803 mt9t031->xskip = 1;
804 mt9t031->yskip = 1;
805
806 mt9t031->clk = v4l2_clk_get(&client->dev, "mclk");
807 if (IS_ERR(mt9t031->clk)) {
808 ret = PTR_ERR(mt9t031->clk);
809 goto eclkget;
810 }
811
812 ret = mt9t031_video_probe(client);
813 if (ret) {
814 v4l2_clk_put(mt9t031->clk);
815 eclkget:
816 v4l2_ctrl_handler_free(&mt9t031->hdl);
817 }
818
819 return ret;
820 }
821
mt9t031_remove(struct i2c_client * client)822 static int mt9t031_remove(struct i2c_client *client)
823 {
824 struct mt9t031 *mt9t031 = to_mt9t031(client);
825
826 v4l2_clk_put(mt9t031->clk);
827 v4l2_device_unregister_subdev(&mt9t031->subdev);
828 v4l2_ctrl_handler_free(&mt9t031->hdl);
829
830 return 0;
831 }
832
833 static const struct i2c_device_id mt9t031_id[] = {
834 { "mt9t031", 0 },
835 { }
836 };
837 MODULE_DEVICE_TABLE(i2c, mt9t031_id);
838
839 static struct i2c_driver mt9t031_i2c_driver = {
840 .driver = {
841 .name = "mt9t031",
842 },
843 .probe = mt9t031_probe,
844 .remove = mt9t031_remove,
845 .id_table = mt9t031_id,
846 };
847
848 module_i2c_driver(mt9t031_i2c_driver);
849
850 MODULE_DESCRIPTION("Micron MT9T031 Camera driver");
851 MODULE_AUTHOR("Guennadi Liakhovetski <lg@denx.de>");
852 MODULE_LICENSE("GPL v2");
853