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[karo-tx-linux.git] / drivers / media / video / mt9t031.c
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");