V4L/DVB (12529): soc-camera: switch to s_crop v4l2-subdev video operation
[linux-2.6.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/videodev2.h>
12 #include <linux/slab.h>
13 #include <linux/i2c.h>
14 #include <linux/log2.h>
15
16 #include <media/v4l2-subdev.h>
17 #include <media/v4l2-chip-ident.h>
18 #include <media/soc_camera.h>
19
20 /* mt9t031 i2c address 0x5d
21  * The platform has to define i2c_board_info and link to it from
22  * struct soc_camera_link */
23
24 /* mt9t031 selected register addresses */
25 #define MT9T031_CHIP_VERSION            0x00
26 #define MT9T031_ROW_START               0x01
27 #define MT9T031_COLUMN_START            0x02
28 #define MT9T031_WINDOW_HEIGHT           0x03
29 #define MT9T031_WINDOW_WIDTH            0x04
30 #define MT9T031_HORIZONTAL_BLANKING     0x05
31 #define MT9T031_VERTICAL_BLANKING       0x06
32 #define MT9T031_OUTPUT_CONTROL          0x07
33 #define MT9T031_SHUTTER_WIDTH_UPPER     0x08
34 #define MT9T031_SHUTTER_WIDTH           0x09
35 #define MT9T031_PIXEL_CLOCK_CONTROL     0x0a
36 #define MT9T031_FRAME_RESTART           0x0b
37 #define MT9T031_SHUTTER_DELAY           0x0c
38 #define MT9T031_RESET                   0x0d
39 #define MT9T031_READ_MODE_1             0x1e
40 #define MT9T031_READ_MODE_2             0x20
41 #define MT9T031_READ_MODE_3             0x21
42 #define MT9T031_ROW_ADDRESS_MODE        0x22
43 #define MT9T031_COLUMN_ADDRESS_MODE     0x23
44 #define MT9T031_GLOBAL_GAIN             0x35
45 #define MT9T031_CHIP_ENABLE             0xF8
46
47 #define MT9T031_MAX_HEIGHT              1536
48 #define MT9T031_MAX_WIDTH               2048
49 #define MT9T031_MIN_HEIGHT              2
50 #define MT9T031_MIN_WIDTH               2
51 #define MT9T031_HORIZONTAL_BLANK        142
52 #define MT9T031_VERTICAL_BLANK          25
53 #define MT9T031_COLUMN_SKIP             32
54 #define MT9T031_ROW_SKIP                20
55
56 #define MT9T031_BUS_PARAM       (SOCAM_PCLK_SAMPLE_RISING |     \
57         SOCAM_PCLK_SAMPLE_FALLING | SOCAM_HSYNC_ACTIVE_HIGH |   \
58         SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_DATA_ACTIVE_HIGH |      \
59         SOCAM_MASTER | SOCAM_DATAWIDTH_10)
60
61 static const struct soc_camera_data_format mt9t031_colour_formats[] = {
62         {
63                 .name           = "Bayer (sRGB) 10 bit",
64                 .depth          = 10,
65                 .fourcc         = V4L2_PIX_FMT_SGRBG10,
66                 .colorspace     = V4L2_COLORSPACE_SRGB,
67         }
68 };
69
70 struct mt9t031 {
71         struct v4l2_subdev subdev;
72         int model;      /* V4L2_IDENT_MT9T031* codes from v4l2-chip-ident.h */
73         unsigned char autoexposure;
74         u16 xskip;
75         u16 yskip;
76 };
77
78 static struct mt9t031 *to_mt9t031(const struct i2c_client *client)
79 {
80         return container_of(i2c_get_clientdata(client), struct mt9t031, subdev);
81 }
82
83 static int reg_read(struct i2c_client *client, const u8 reg)
84 {
85         s32 data = i2c_smbus_read_word_data(client, reg);
86         return data < 0 ? data : swab16(data);
87 }
88
89 static int reg_write(struct i2c_client *client, const u8 reg,
90                      const u16 data)
91 {
92         return i2c_smbus_write_word_data(client, reg, swab16(data));
93 }
94
95 static int reg_set(struct i2c_client *client, const u8 reg,
96                    const u16 data)
97 {
98         int ret;
99
100         ret = reg_read(client, reg);
101         if (ret < 0)
102                 return ret;
103         return reg_write(client, reg, ret | data);
104 }
105
106 static int reg_clear(struct i2c_client *client, const u8 reg,
107                      const u16 data)
108 {
109         int ret;
110
111         ret = reg_read(client, reg);
112         if (ret < 0)
113                 return ret;
114         return reg_write(client, reg, ret & ~data);
115 }
116
117 static int set_shutter(struct i2c_client *client, const u32 data)
118 {
119         int ret;
120
121         ret = reg_write(client, MT9T031_SHUTTER_WIDTH_UPPER, data >> 16);
122
123         if (ret >= 0)
124                 ret = reg_write(client, MT9T031_SHUTTER_WIDTH, data & 0xffff);
125
126         return ret;
127 }
128
129 static int get_shutter(struct i2c_client *client, u32 *data)
130 {
131         int ret;
132
133         ret = reg_read(client, MT9T031_SHUTTER_WIDTH_UPPER);
134         *data = ret << 16;
135
136         if (ret >= 0)
137                 ret = reg_read(client, MT9T031_SHUTTER_WIDTH);
138         *data |= ret & 0xffff;
139
140         return ret < 0 ? ret : 0;
141 }
142
143 static int mt9t031_idle(struct i2c_client *client)
144 {
145         int ret;
146
147         /* Disable chip output, synchronous option update */
148         ret = reg_write(client, MT9T031_RESET, 1);
149         if (ret >= 0)
150                 ret = reg_write(client, MT9T031_RESET, 0);
151         if (ret >= 0)
152                 ret = reg_clear(client, MT9T031_OUTPUT_CONTROL, 2);
153
154         return ret >= 0 ? 0 : -EIO;
155 }
156
157 static int mt9t031_disable(struct i2c_client *client)
158 {
159         /* Disable the chip */
160         reg_clear(client, MT9T031_OUTPUT_CONTROL, 2);
161
162         return 0;
163 }
164
165 static int mt9t031_init(struct soc_camera_device *icd)
166 {
167         struct i2c_client *client = to_i2c_client(to_soc_camera_control(icd));
168
169         return mt9t031_idle(client);
170 }
171
172 static int mt9t031_release(struct soc_camera_device *icd)
173 {
174         struct i2c_client *client = to_i2c_client(to_soc_camera_control(icd));
175
176         return mt9t031_disable(client);
177 }
178
179 static int mt9t031_s_stream(struct v4l2_subdev *sd, int enable)
180 {
181         struct i2c_client *client = sd->priv;
182         int ret;
183
184         if (enable)
185                 /* Switch to master "normal" mode */
186                 ret = reg_set(client, MT9T031_OUTPUT_CONTROL, 2);
187         else
188                 /* Stop sensor readout */
189                 ret = reg_clear(client, MT9T031_OUTPUT_CONTROL, 2);
190
191         if (ret < 0)
192                 return -EIO;
193
194         return 0;
195 }
196
197 static int mt9t031_set_bus_param(struct soc_camera_device *icd,
198                                  unsigned long flags)
199 {
200         struct i2c_client *client = to_i2c_client(to_soc_camera_control(icd));
201
202         /* The caller should have queried our parameters, check anyway */
203         if (flags & ~MT9T031_BUS_PARAM)
204                 return -EINVAL;
205
206         if (flags & SOCAM_PCLK_SAMPLE_FALLING)
207                 reg_clear(client, MT9T031_PIXEL_CLOCK_CONTROL, 0x8000);
208         else
209                 reg_set(client, MT9T031_PIXEL_CLOCK_CONTROL, 0x8000);
210
211         return 0;
212 }
213
214 static unsigned long mt9t031_query_bus_param(struct soc_camera_device *icd)
215 {
216         struct soc_camera_link *icl = to_soc_camera_link(icd);
217
218         return soc_camera_apply_sensor_flags(icl, MT9T031_BUS_PARAM);
219 }
220
221 /* Round up minima and round down maxima */
222 static void recalculate_limits(struct soc_camera_device *icd,
223                                u16 xskip, u16 yskip)
224 {
225         icd->rect_max.left = (MT9T031_COLUMN_SKIP + xskip - 1) / xskip;
226         icd->rect_max.top = (MT9T031_ROW_SKIP + yskip - 1) / yskip;
227         icd->width_min = (MT9T031_MIN_WIDTH + xskip - 1) / xskip;
228         icd->height_min = (MT9T031_MIN_HEIGHT + yskip - 1) / yskip;
229         icd->rect_max.width = MT9T031_MAX_WIDTH / xskip;
230         icd->rect_max.height = MT9T031_MAX_HEIGHT / yskip;
231 }
232
233 static int mt9t031_set_params(struct soc_camera_device *icd,
234                               struct v4l2_rect *rect, u16 xskip, u16 yskip)
235 {
236         struct i2c_client *client = to_i2c_client(to_soc_camera_control(icd));
237         struct mt9t031 *mt9t031 = to_mt9t031(client);
238         int ret;
239         u16 xbin, ybin, width, height, left, top;
240         const u16 hblank = MT9T031_HORIZONTAL_BLANK,
241                 vblank = MT9T031_VERTICAL_BLANK;
242
243         width = rect->width * xskip;
244         height = rect->height * yskip;
245         left = rect->left * xskip;
246         top = rect->top * yskip;
247
248         xbin = min(xskip, (u16)3);
249         ybin = min(yskip, (u16)3);
250
251         dev_dbg(&icd->dev, "xskip %u, width %u/%u, yskip %u, height %u/%u\n",
252                 xskip, width, rect->width, yskip, height, rect->height);
253
254         /* Could just do roundup(rect->left, [xy]bin * 2); but this is cheaper */
255         switch (xbin) {
256         case 2:
257                 left = (left + 3) & ~3;
258                 break;
259         case 3:
260                 left = roundup(left, 6);
261         }
262
263         switch (ybin) {
264         case 2:
265                 top = (top + 3) & ~3;
266                 break;
267         case 3:
268                 top = roundup(top, 6);
269         }
270
271         /* Disable register update, reconfigure atomically */
272         ret = reg_set(client, MT9T031_OUTPUT_CONTROL, 1);
273         if (ret < 0)
274                 return ret;
275
276         /* Blanking and start values - default... */
277         ret = reg_write(client, MT9T031_HORIZONTAL_BLANKING, hblank);
278         if (ret >= 0)
279                 ret = reg_write(client, MT9T031_VERTICAL_BLANKING, vblank);
280
281         if (yskip != mt9t031->yskip || xskip != mt9t031->xskip) {
282                 /* Binning, skipping */
283                 if (ret >= 0)
284                         ret = reg_write(client, MT9T031_COLUMN_ADDRESS_MODE,
285                                         ((xbin - 1) << 4) | (xskip - 1));
286                 if (ret >= 0)
287                         ret = reg_write(client, MT9T031_ROW_ADDRESS_MODE,
288                                         ((ybin - 1) << 4) | (yskip - 1));
289         }
290         dev_dbg(&icd->dev, "new physical left %u, top %u\n", left, top);
291
292         /* The caller provides a supported format, as guaranteed by
293          * icd->try_fmt_cap(), soc_camera_s_crop() and soc_camera_cropcap() */
294         if (ret >= 0)
295                 ret = reg_write(client, MT9T031_COLUMN_START, left);
296         if (ret >= 0)
297                 ret = reg_write(client, MT9T031_ROW_START, top);
298         if (ret >= 0)
299                 ret = reg_write(client, MT9T031_WINDOW_WIDTH, width - 1);
300         if (ret >= 0)
301                 ret = reg_write(client, MT9T031_WINDOW_HEIGHT,
302                                 height + icd->y_skip_top - 1);
303         if (ret >= 0 && mt9t031->autoexposure) {
304                 ret = set_shutter(client, height + icd->y_skip_top + vblank);
305                 if (ret >= 0) {
306                         const u32 shutter_max = MT9T031_MAX_HEIGHT + vblank;
307                         const struct v4l2_queryctrl *qctrl =
308                                 soc_camera_find_qctrl(icd->ops,
309                                                       V4L2_CID_EXPOSURE);
310                         icd->exposure = (shutter_max / 2 + (height +
311                                          icd->y_skip_top + vblank - 1) *
312                                          (qctrl->maximum - qctrl->minimum)) /
313                                 shutter_max + qctrl->minimum;
314                 }
315         }
316
317         /* Re-enable register update, commit all changes */
318         if (ret >= 0)
319                 ret = reg_clear(client, MT9T031_OUTPUT_CONTROL, 1);
320
321         return ret < 0 ? ret : 0;
322 }
323
324 static int mt9t031_s_crop(struct v4l2_subdev *sd, struct v4l2_crop *a)
325 {
326         struct v4l2_rect *rect = &a->c;
327         struct i2c_client *client = sd->priv;
328         struct mt9t031 *mt9t031 = to_mt9t031(client);
329         struct soc_camera_device *icd = client->dev.platform_data;
330
331         /* Make sure we don't exceed sensor limits */
332         if (rect->left + rect->width > icd->rect_max.left + icd->rect_max.width)
333                 rect->left = icd->rect_max.width + icd->rect_max.left -
334                         rect->width;
335
336         if (rect->top + rect->height > icd->rect_max.height + icd->rect_max.top)
337                 rect->top = icd->rect_max.height + icd->rect_max.top -
338                         rect->height;
339
340         /* CROP - no change in scaling, or in limits */
341         return mt9t031_set_params(icd, rect, mt9t031->xskip, mt9t031->yskip);
342 }
343
344 static int mt9t031_s_fmt(struct v4l2_subdev *sd, struct v4l2_format *f)
345 {
346         struct i2c_client *client = sd->priv;
347         struct mt9t031 *mt9t031 = to_mt9t031(client);
348         struct soc_camera_device *icd = client->dev.platform_data;
349         int ret;
350         u16 xskip, yskip;
351         struct v4l2_rect rect = {
352                 .left   = icd->rect_current.left,
353                 .top    = icd->rect_current.top,
354                 .width  = f->fmt.pix.width,
355                 .height = f->fmt.pix.height,
356         };
357
358         /*
359          * try_fmt has put rectangle within limits.
360          * S_FMT - use binning and skipping for scaling, recalculate
361          * limits, used for cropping
362          */
363         /* Is this more optimal than just a division? */
364         for (xskip = 8; xskip > 1; xskip--)
365                 if (rect.width * xskip <= MT9T031_MAX_WIDTH)
366                         break;
367
368         for (yskip = 8; yskip > 1; yskip--)
369                 if (rect.height * yskip <= MT9T031_MAX_HEIGHT)
370                         break;
371
372         recalculate_limits(icd, xskip, yskip);
373
374         ret = mt9t031_set_params(icd, &rect, xskip, yskip);
375         if (!ret) {
376                 mt9t031->xskip = xskip;
377                 mt9t031->yskip = yskip;
378         }
379
380         return ret;
381 }
382
383 static int mt9t031_try_fmt(struct v4l2_subdev *sd, struct v4l2_format *f)
384 {
385         struct v4l2_pix_format *pix = &f->fmt.pix;
386
387         v4l_bound_align_image(
388                 &pix->width, MT9T031_MIN_WIDTH, MT9T031_MAX_WIDTH, 1,
389                 &pix->height, MT9T031_MIN_HEIGHT, MT9T031_MAX_HEIGHT, 1, 0);
390
391         return 0;
392 }
393
394 static int mt9t031_g_chip_ident(struct v4l2_subdev *sd,
395                                 struct v4l2_dbg_chip_ident *id)
396 {
397         struct i2c_client *client = sd->priv;
398         struct mt9t031 *mt9t031 = to_mt9t031(client);
399
400         if (id->match.type != V4L2_CHIP_MATCH_I2C_ADDR)
401                 return -EINVAL;
402
403         if (id->match.addr != client->addr)
404                 return -ENODEV;
405
406         id->ident       = mt9t031->model;
407         id->revision    = 0;
408
409         return 0;
410 }
411
412 #ifdef CONFIG_VIDEO_ADV_DEBUG
413 static int mt9t031_g_register(struct v4l2_subdev *sd,
414                               struct v4l2_dbg_register *reg)
415 {
416         struct i2c_client *client = sd->priv;
417
418         if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
419                 return -EINVAL;
420
421         if (reg->match.addr != client->addr)
422                 return -ENODEV;
423
424         reg->val = reg_read(client, reg->reg);
425
426         if (reg->val > 0xffff)
427                 return -EIO;
428
429         return 0;
430 }
431
432 static int mt9t031_s_register(struct v4l2_subdev *sd,
433                               struct v4l2_dbg_register *reg)
434 {
435         struct i2c_client *client = sd->priv;
436
437         if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
438                 return -EINVAL;
439
440         if (reg->match.addr != client->addr)
441                 return -ENODEV;
442
443         if (reg_write(client, reg->reg, reg->val) < 0)
444                 return -EIO;
445
446         return 0;
447 }
448 #endif
449
450 static const struct v4l2_queryctrl mt9t031_controls[] = {
451         {
452                 .id             = V4L2_CID_VFLIP,
453                 .type           = V4L2_CTRL_TYPE_BOOLEAN,
454                 .name           = "Flip Vertically",
455                 .minimum        = 0,
456                 .maximum        = 1,
457                 .step           = 1,
458                 .default_value  = 0,
459         }, {
460                 .id             = V4L2_CID_HFLIP,
461                 .type           = V4L2_CTRL_TYPE_BOOLEAN,
462                 .name           = "Flip Horizontally",
463                 .minimum        = 0,
464                 .maximum        = 1,
465                 .step           = 1,
466                 .default_value  = 0,
467         }, {
468                 .id             = V4L2_CID_GAIN,
469                 .type           = V4L2_CTRL_TYPE_INTEGER,
470                 .name           = "Gain",
471                 .minimum        = 0,
472                 .maximum        = 127,
473                 .step           = 1,
474                 .default_value  = 64,
475                 .flags          = V4L2_CTRL_FLAG_SLIDER,
476         }, {
477                 .id             = V4L2_CID_EXPOSURE,
478                 .type           = V4L2_CTRL_TYPE_INTEGER,
479                 .name           = "Exposure",
480                 .minimum        = 1,
481                 .maximum        = 255,
482                 .step           = 1,
483                 .default_value  = 255,
484                 .flags          = V4L2_CTRL_FLAG_SLIDER,
485         }, {
486                 .id             = V4L2_CID_EXPOSURE_AUTO,
487                 .type           = V4L2_CTRL_TYPE_BOOLEAN,
488                 .name           = "Automatic Exposure",
489                 .minimum        = 0,
490                 .maximum        = 1,
491                 .step           = 1,
492                 .default_value  = 1,
493         }
494 };
495
496 static struct soc_camera_ops mt9t031_ops = {
497         .init                   = mt9t031_init,
498         .release                = mt9t031_release,
499         .set_bus_param          = mt9t031_set_bus_param,
500         .query_bus_param        = mt9t031_query_bus_param,
501         .controls               = mt9t031_controls,
502         .num_controls           = ARRAY_SIZE(mt9t031_controls),
503 };
504
505 static int mt9t031_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
506 {
507         struct i2c_client *client = sd->priv;
508         struct mt9t031 *mt9t031 = to_mt9t031(client);
509         int data;
510
511         switch (ctrl->id) {
512         case V4L2_CID_VFLIP:
513                 data = reg_read(client, MT9T031_READ_MODE_2);
514                 if (data < 0)
515                         return -EIO;
516                 ctrl->value = !!(data & 0x8000);
517                 break;
518         case V4L2_CID_HFLIP:
519                 data = reg_read(client, MT9T031_READ_MODE_2);
520                 if (data < 0)
521                         return -EIO;
522                 ctrl->value = !!(data & 0x4000);
523                 break;
524         case V4L2_CID_EXPOSURE_AUTO:
525                 ctrl->value = mt9t031->autoexposure;
526                 break;
527         }
528         return 0;
529 }
530
531 static int mt9t031_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
532 {
533         struct i2c_client *client = sd->priv;
534         struct mt9t031 *mt9t031 = to_mt9t031(client);
535         struct soc_camera_device *icd = client->dev.platform_data;
536         const struct v4l2_queryctrl *qctrl;
537         int data;
538
539         qctrl = soc_camera_find_qctrl(&mt9t031_ops, ctrl->id);
540
541         if (!qctrl)
542                 return -EINVAL;
543
544         switch (ctrl->id) {
545         case V4L2_CID_VFLIP:
546                 if (ctrl->value)
547                         data = reg_set(client, MT9T031_READ_MODE_2, 0x8000);
548                 else
549                         data = reg_clear(client, MT9T031_READ_MODE_2, 0x8000);
550                 if (data < 0)
551                         return -EIO;
552                 break;
553         case V4L2_CID_HFLIP:
554                 if (ctrl->value)
555                         data = reg_set(client, MT9T031_READ_MODE_2, 0x4000);
556                 else
557                         data = reg_clear(client, MT9T031_READ_MODE_2, 0x4000);
558                 if (data < 0)
559                         return -EIO;
560                 break;
561         case V4L2_CID_GAIN:
562                 if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum)
563                         return -EINVAL;
564                 /* See Datasheet Table 7, Gain settings. */
565                 if (ctrl->value <= qctrl->default_value) {
566                         /* Pack it into 0..1 step 0.125, register values 0..8 */
567                         unsigned long range = qctrl->default_value - qctrl->minimum;
568                         data = ((ctrl->value - qctrl->minimum) * 8 + range / 2) / range;
569
570                         dev_dbg(&icd->dev, "Setting gain %d\n", data);
571                         data = reg_write(client, MT9T031_GLOBAL_GAIN, data);
572                         if (data < 0)
573                                 return -EIO;
574                 } else {
575                         /* Pack it into 1.125..128 variable step, register values 9..0x7860 */
576                         /* We assume qctrl->maximum - qctrl->default_value - 1 > 0 */
577                         unsigned long range = qctrl->maximum - qctrl->default_value - 1;
578                         /* calculated gain: map 65..127 to 9..1024 step 0.125 */
579                         unsigned long gain = ((ctrl->value - qctrl->default_value - 1) *
580                                                1015 + range / 2) / range + 9;
581
582                         if (gain <= 32)         /* calculated gain 9..32 -> 9..32 */
583                                 data = gain;
584                         else if (gain <= 64)    /* calculated gain 33..64 -> 0x51..0x60 */
585                                 data = ((gain - 32) * 16 + 16) / 32 + 80;
586                         else
587                                 /* calculated gain 65..1024 -> (1..120) << 8 + 0x60 */
588                                 data = (((gain - 64 + 7) * 32) & 0xff00) | 0x60;
589
590                         dev_dbg(&icd->dev, "Setting gain from 0x%x to 0x%x\n",
591                                 reg_read(client, MT9T031_GLOBAL_GAIN), data);
592                         data = reg_write(client, MT9T031_GLOBAL_GAIN, data);
593                         if (data < 0)
594                                 return -EIO;
595                 }
596
597                 /* Success */
598                 icd->gain = ctrl->value;
599                 break;
600         case V4L2_CID_EXPOSURE:
601                 /* mt9t031 has maximum == default */
602                 if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum)
603                         return -EINVAL;
604                 else {
605                         const unsigned long range = qctrl->maximum - qctrl->minimum;
606                         const u32 shutter = ((ctrl->value - qctrl->minimum) * 1048 +
607                                              range / 2) / range + 1;
608                         u32 old;
609
610                         get_shutter(client, &old);
611                         dev_dbg(&icd->dev, "Setting shutter width from %u to %u\n",
612                                 old, shutter);
613                         if (set_shutter(client, shutter) < 0)
614                                 return -EIO;
615                         icd->exposure = ctrl->value;
616                         mt9t031->autoexposure = 0;
617                 }
618                 break;
619         case V4L2_CID_EXPOSURE_AUTO:
620                 if (ctrl->value) {
621                         const u16 vblank = MT9T031_VERTICAL_BLANK;
622                         const u32 shutter_max = MT9T031_MAX_HEIGHT + vblank;
623                         if (set_shutter(client, icd->rect_current.height +
624                                         icd->y_skip_top + vblank) < 0)
625                                 return -EIO;
626                         qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_EXPOSURE);
627                         icd->exposure = (shutter_max / 2 +
628                                          (icd->rect_current.height +
629                                           icd->y_skip_top + vblank - 1) *
630                                          (qctrl->maximum - qctrl->minimum)) /
631                                 shutter_max + qctrl->minimum;
632                         mt9t031->autoexposure = 1;
633                 } else
634                         mt9t031->autoexposure = 0;
635                 break;
636         }
637         return 0;
638 }
639
640 /* Interface active, can use i2c. If it fails, it can indeed mean, that
641  * this wasn't our capture interface, so, we wait for the right one */
642 static int mt9t031_video_probe(struct i2c_client *client)
643 {
644         struct soc_camera_device *icd = client->dev.platform_data;
645         struct mt9t031 *mt9t031 = to_mt9t031(client);
646         s32 data;
647
648         /* We must have a parent by now. And it cannot be a wrong one.
649          * So this entire test is completely redundant. */
650         if (!icd->dev.parent ||
651             to_soc_camera_host(icd->dev.parent)->nr != icd->iface)
652                 return -ENODEV;
653
654         /* Enable the chip */
655         data = reg_write(client, MT9T031_CHIP_ENABLE, 1);
656         dev_dbg(&icd->dev, "write: %d\n", data);
657
658         /* Read out the chip version register */
659         data = reg_read(client, MT9T031_CHIP_VERSION);
660
661         switch (data) {
662         case 0x1621:
663                 mt9t031->model = V4L2_IDENT_MT9T031;
664                 icd->formats = mt9t031_colour_formats;
665                 icd->num_formats = ARRAY_SIZE(mt9t031_colour_formats);
666                 break;
667         default:
668                 dev_err(&icd->dev,
669                         "No MT9T031 chip detected, register read %x\n", data);
670                 return -ENODEV;
671         }
672
673         dev_info(&icd->dev, "Detected a MT9T031 chip ID %x\n", data);
674
675         return 0;
676 }
677
678 static struct v4l2_subdev_core_ops mt9t031_subdev_core_ops = {
679         .g_ctrl         = mt9t031_g_ctrl,
680         .s_ctrl         = mt9t031_s_ctrl,
681         .g_chip_ident   = mt9t031_g_chip_ident,
682 #ifdef CONFIG_VIDEO_ADV_DEBUG
683         .g_register     = mt9t031_g_register,
684         .s_register     = mt9t031_s_register,
685 #endif
686 };
687
688 static struct v4l2_subdev_video_ops mt9t031_subdev_video_ops = {
689         .s_stream       = mt9t031_s_stream,
690         .s_fmt          = mt9t031_s_fmt,
691         .try_fmt        = mt9t031_try_fmt,
692         .s_crop         = mt9t031_s_crop,
693 };
694
695 static struct v4l2_subdev_ops mt9t031_subdev_ops = {
696         .core   = &mt9t031_subdev_core_ops,
697         .video  = &mt9t031_subdev_video_ops,
698 };
699
700 static int mt9t031_probe(struct i2c_client *client,
701                          const struct i2c_device_id *did)
702 {
703         struct mt9t031 *mt9t031;
704         struct soc_camera_device *icd = client->dev.platform_data;
705         struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
706         struct soc_camera_link *icl;
707         int ret;
708
709         if (!icd) {
710                 dev_err(&client->dev, "MT9T031: missing soc-camera data!\n");
711                 return -EINVAL;
712         }
713
714         icl = to_soc_camera_link(icd);
715         if (!icl) {
716                 dev_err(&client->dev, "MT9T031 driver needs platform data\n");
717                 return -EINVAL;
718         }
719
720         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
721                 dev_warn(&adapter->dev,
722                          "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
723                 return -EIO;
724         }
725
726         mt9t031 = kzalloc(sizeof(struct mt9t031), GFP_KERNEL);
727         if (!mt9t031)
728                 return -ENOMEM;
729
730         v4l2_i2c_subdev_init(&mt9t031->subdev, client, &mt9t031_subdev_ops);
731
732         /* Second stage probe - when a capture adapter is there */
733         icd->ops                = &mt9t031_ops;
734         icd->rect_max.left      = MT9T031_COLUMN_SKIP;
735         icd->rect_max.top       = MT9T031_ROW_SKIP;
736         icd->rect_current.left  = icd->rect_max.left;
737         icd->rect_current.top   = icd->rect_max.top;
738         icd->width_min          = MT9T031_MIN_WIDTH;
739         icd->rect_max.width     = MT9T031_MAX_WIDTH;
740         icd->height_min         = MT9T031_MIN_HEIGHT;
741         icd->rect_max.height    = MT9T031_MAX_HEIGHT;
742         icd->y_skip_top         = 0;
743         /* Simulated autoexposure. If enabled, we calculate shutter width
744          * ourselves in the driver based on vertical blanking and frame width */
745         mt9t031->autoexposure = 1;
746
747         mt9t031->xskip = 1;
748         mt9t031->yskip = 1;
749
750         mt9t031_idle(client);
751
752         ret = mt9t031_video_probe(client);
753
754         mt9t031_disable(client);
755
756         if (ret) {
757                 icd->ops = NULL;
758                 i2c_set_clientdata(client, NULL);
759                 kfree(mt9t031);
760         }
761
762         return ret;
763 }
764
765 static int mt9t031_remove(struct i2c_client *client)
766 {
767         struct mt9t031 *mt9t031 = to_mt9t031(client);
768         struct soc_camera_device *icd = client->dev.platform_data;
769
770         icd->ops = NULL;
771         i2c_set_clientdata(client, NULL);
772         client->driver = NULL;
773         kfree(mt9t031);
774
775         return 0;
776 }
777
778 static const struct i2c_device_id mt9t031_id[] = {
779         { "mt9t031", 0 },
780         { }
781 };
782 MODULE_DEVICE_TABLE(i2c, mt9t031_id);
783
784 static struct i2c_driver mt9t031_i2c_driver = {
785         .driver = {
786                 .name = "mt9t031",
787         },
788         .probe          = mt9t031_probe,
789         .remove         = mt9t031_remove,
790         .id_table       = mt9t031_id,
791 };
792
793 static int __init mt9t031_mod_init(void)
794 {
795         return i2c_add_driver(&mt9t031_i2c_driver);
796 }
797
798 static void __exit mt9t031_mod_exit(void)
799 {
800         i2c_del_driver(&mt9t031_i2c_driver);
801 }
802
803 module_init(mt9t031_mod_init);
804 module_exit(mt9t031_mod_exit);
805
806 MODULE_DESCRIPTION("Micron MT9T031 Camera driver");
807 MODULE_AUTHOR("Guennadi Liakhovetski <lg@denx.de>");
808 MODULE_LICENSE("GPL v2");