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69c227f65bcb887d2926ca56b898f8eb3b0624f7
[deliverable/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/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 /*
21 * mt9t031 i2c address 0x5d
22 * The platform has to define i2c_board_info and link to it from
23 * struct soc_camera_link
24 */
25
26 /* mt9t031 selected register addresses */
27 #define MT9T031_CHIP_VERSION 0x00
28 #define MT9T031_ROW_START 0x01
29 #define MT9T031_COLUMN_START 0x02
30 #define MT9T031_WINDOW_HEIGHT 0x03
31 #define MT9T031_WINDOW_WIDTH 0x04
32 #define MT9T031_HORIZONTAL_BLANKING 0x05
33 #define MT9T031_VERTICAL_BLANKING 0x06
34 #define MT9T031_OUTPUT_CONTROL 0x07
35 #define MT9T031_SHUTTER_WIDTH_UPPER 0x08
36 #define MT9T031_SHUTTER_WIDTH 0x09
37 #define MT9T031_PIXEL_CLOCK_CONTROL 0x0a
38 #define MT9T031_FRAME_RESTART 0x0b
39 #define MT9T031_SHUTTER_DELAY 0x0c
40 #define MT9T031_RESET 0x0d
41 #define MT9T031_READ_MODE_1 0x1e
42 #define MT9T031_READ_MODE_2 0x20
43 #define MT9T031_READ_MODE_3 0x21
44 #define MT9T031_ROW_ADDRESS_MODE 0x22
45 #define MT9T031_COLUMN_ADDRESS_MODE 0x23
46 #define MT9T031_GLOBAL_GAIN 0x35
47 #define MT9T031_CHIP_ENABLE 0xF8
48
49 #define MT9T031_MAX_HEIGHT 1536
50 #define MT9T031_MAX_WIDTH 2048
51 #define MT9T031_MIN_HEIGHT 2
52 #define MT9T031_MIN_WIDTH 18
53 #define MT9T031_HORIZONTAL_BLANK 142
54 #define MT9T031_VERTICAL_BLANK 25
55 #define MT9T031_COLUMN_SKIP 32
56 #define MT9T031_ROW_SKIP 20
57
58 #define MT9T031_BUS_PARAM (SOCAM_PCLK_SAMPLE_RISING | \
59 SOCAM_PCLK_SAMPLE_FALLING | SOCAM_HSYNC_ACTIVE_HIGH | \
60 SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_DATA_ACTIVE_HIGH | \
61 SOCAM_MASTER | SOCAM_DATAWIDTH_10)
62
63 struct mt9t031 {
64 struct v4l2_subdev subdev;
65 struct v4l2_rect rect; /* Sensor window */
66 int model; /* V4L2_IDENT_MT9T031* codes from v4l2-chip-ident.h */
67 u16 xskip;
68 u16 yskip;
69 unsigned int gain;
70 unsigned short y_skip_top; /* Lines to skip at the top */
71 unsigned int exposure;
72 unsigned char autoexposure;
73 };
74
75 static struct mt9t031 *to_mt9t031(const struct i2c_client *client)
76 {
77 return container_of(i2c_get_clientdata(client), struct mt9t031, subdev);
78 }
79
80 static int reg_read(struct i2c_client *client, const u8 reg)
81 {
82 s32 data = i2c_smbus_read_word_data(client, reg);
83 return data < 0 ? data : swab16(data);
84 }
85
86 static int reg_write(struct i2c_client *client, const u8 reg,
87 const u16 data)
88 {
89 return i2c_smbus_write_word_data(client, reg, swab16(data));
90 }
91
92 static int reg_set(struct i2c_client *client, const u8 reg,
93 const u16 data)
94 {
95 int ret;
96
97 ret = reg_read(client, reg);
98 if (ret < 0)
99 return ret;
100 return reg_write(client, reg, ret | data);
101 }
102
103 static int reg_clear(struct i2c_client *client, const u8 reg,
104 const u16 data)
105 {
106 int ret;
107
108 ret = reg_read(client, reg);
109 if (ret < 0)
110 return ret;
111 return reg_write(client, reg, ret & ~data);
112 }
113
114 static int set_shutter(struct i2c_client *client, const u32 data)
115 {
116 int ret;
117
118 ret = reg_write(client, MT9T031_SHUTTER_WIDTH_UPPER, data >> 16);
119
120 if (ret >= 0)
121 ret = reg_write(client, MT9T031_SHUTTER_WIDTH, data & 0xffff);
122
123 return ret;
124 }
125
126 static int get_shutter(struct i2c_client *client, u32 *data)
127 {
128 int ret;
129
130 ret = reg_read(client, MT9T031_SHUTTER_WIDTH_UPPER);
131 *data = ret << 16;
132
133 if (ret >= 0)
134 ret = reg_read(client, MT9T031_SHUTTER_WIDTH);
135 *data |= ret & 0xffff;
136
137 return ret < 0 ? ret : 0;
138 }
139
140 static int mt9t031_idle(struct i2c_client *client)
141 {
142 int ret;
143
144 /* Disable chip output, synchronous option update */
145 ret = reg_write(client, MT9T031_RESET, 1);
146 if (ret >= 0)
147 ret = reg_write(client, MT9T031_RESET, 0);
148 if (ret >= 0)
149 ret = reg_clear(client, MT9T031_OUTPUT_CONTROL, 2);
150
151 return ret >= 0 ? 0 : -EIO;
152 }
153
154 static int mt9t031_disable(struct i2c_client *client)
155 {
156 /* Disable the chip */
157 reg_clear(client, MT9T031_OUTPUT_CONTROL, 2);
158
159 return 0;
160 }
161
162 static int mt9t031_s_stream(struct v4l2_subdev *sd, int enable)
163 {
164 struct i2c_client *client = sd->priv;
165 int ret;
166
167 if (enable)
168 /* Switch to master "normal" mode */
169 ret = reg_set(client, MT9T031_OUTPUT_CONTROL, 2);
170 else
171 /* Stop sensor readout */
172 ret = reg_clear(client, MT9T031_OUTPUT_CONTROL, 2);
173
174 if (ret < 0)
175 return -EIO;
176
177 return 0;
178 }
179
180 static int mt9t031_set_bus_param(struct soc_camera_device *icd,
181 unsigned long flags)
182 {
183 struct i2c_client *client = to_i2c_client(to_soc_camera_control(icd));
184
185 /* The caller should have queried our parameters, check anyway */
186 if (flags & ~MT9T031_BUS_PARAM)
187 return -EINVAL;
188
189 if (flags & SOCAM_PCLK_SAMPLE_FALLING)
190 reg_clear(client, MT9T031_PIXEL_CLOCK_CONTROL, 0x8000);
191 else
192 reg_set(client, MT9T031_PIXEL_CLOCK_CONTROL, 0x8000);
193
194 return 0;
195 }
196
197 static unsigned long mt9t031_query_bus_param(struct soc_camera_device *icd)
198 {
199 struct soc_camera_link *icl = to_soc_camera_link(icd);
200
201 return soc_camera_apply_sensor_flags(icl, MT9T031_BUS_PARAM);
202 }
203
204 /* target must be _even_ */
205 static u16 mt9t031_skip(s32 *source, s32 target, s32 max)
206 {
207 unsigned int skip;
208
209 if (*source < target + target / 2) {
210 *source = target;
211 return 1;
212 }
213
214 skip = min(max, *source + target / 2) / target;
215 if (skip > 8)
216 skip = 8;
217 *source = target * skip;
218
219 return skip;
220 }
221
222 /* rect is the sensor rectangle, the caller guarantees parameter validity */
223 static int mt9t031_set_params(struct soc_camera_device *icd,
224 struct v4l2_rect *rect, u16 xskip, u16 yskip)
225 {
226 struct i2c_client *client = to_i2c_client(to_soc_camera_control(icd));
227 struct mt9t031 *mt9t031 = to_mt9t031(client);
228 int ret;
229 u16 xbin, ybin;
230 const u16 hblank = MT9T031_HORIZONTAL_BLANK,
231 vblank = MT9T031_VERTICAL_BLANK;
232
233 xbin = min(xskip, (u16)3);
234 ybin = min(yskip, (u16)3);
235
236 /*
237 * Could just do roundup(rect->left, [xy]bin * 2); but this is cheaper.
238 * There is always a valid suitably aligned value. The worst case is
239 * xbin = 3, width = 2048. Then we will start at 36, the last read out
240 * pixel will be 2083, which is < 2085 - first black pixel.
241 *
242 * MT9T031 datasheet imposes window left border alignment, depending on
243 * the selected xskip. Failing to conform to this requirement produces
244 * dark horizontal stripes in the image. However, even obeying to this
245 * requirement doesn't eliminate the stripes in all configurations. They
246 * appear "locally reproducibly," but can differ between tests under
247 * different lighting conditions.
248 */
249 switch (xbin) {
250 case 1:
251 rect->left &= ~1;
252 break;
253 case 2:
254 rect->left &= ~3;
255 break;
256 case 3:
257 rect->left = rect->left > roundup(MT9T031_COLUMN_SKIP, 6) ?
258 (rect->left / 6) * 6 : roundup(MT9T031_COLUMN_SKIP, 6);
259 }
260
261 rect->top &= ~1;
262
263 dev_dbg(&client->dev, "skip %u:%u, rect %ux%u@%u:%u\n",
264 xskip, yskip, rect->width, rect->height, rect->left, rect->top);
265
266 /* Disable register update, reconfigure atomically */
267 ret = reg_set(client, MT9T031_OUTPUT_CONTROL, 1);
268 if (ret < 0)
269 return ret;
270
271 /* Blanking and start values - default... */
272 ret = reg_write(client, MT9T031_HORIZONTAL_BLANKING, hblank);
273 if (ret >= 0)
274 ret = reg_write(client, MT9T031_VERTICAL_BLANKING, vblank);
275
276 if (yskip != mt9t031->yskip || xskip != mt9t031->xskip) {
277 /* Binning, skipping */
278 if (ret >= 0)
279 ret = reg_write(client, MT9T031_COLUMN_ADDRESS_MODE,
280 ((xbin - 1) << 4) | (xskip - 1));
281 if (ret >= 0)
282 ret = reg_write(client, MT9T031_ROW_ADDRESS_MODE,
283 ((ybin - 1) << 4) | (yskip - 1));
284 }
285 dev_dbg(&client->dev, "new physical left %u, top %u\n",
286 rect->left, rect->top);
287
288 /*
289 * The caller provides a supported format, as guaranteed by
290 * icd->try_fmt_cap(), soc_camera_s_crop() and soc_camera_cropcap()
291 */
292 if (ret >= 0)
293 ret = reg_write(client, MT9T031_COLUMN_START, rect->left);
294 if (ret >= 0)
295 ret = reg_write(client, MT9T031_ROW_START, rect->top);
296 if (ret >= 0)
297 ret = reg_write(client, MT9T031_WINDOW_WIDTH, rect->width - 1);
298 if (ret >= 0)
299 ret = reg_write(client, MT9T031_WINDOW_HEIGHT,
300 rect->height + mt9t031->y_skip_top - 1);
301 if (ret >= 0 && mt9t031->autoexposure) {
302 unsigned int total_h = rect->height + mt9t031->y_skip_top + vblank;
303 ret = set_shutter(client, total_h);
304 if (ret >= 0) {
305 const u32 shutter_max = MT9T031_MAX_HEIGHT + vblank;
306 const struct v4l2_queryctrl *qctrl =
307 soc_camera_find_qctrl(icd->ops,
308 V4L2_CID_EXPOSURE);
309 mt9t031->exposure = (shutter_max / 2 + (total_h - 1) *
310 (qctrl->maximum - qctrl->minimum)) /
311 shutter_max + qctrl->minimum;
312 }
313 }
314
315 /* Re-enable register update, commit all changes */
316 if (ret >= 0)
317 ret = reg_clear(client, MT9T031_OUTPUT_CONTROL, 1);
318
319 if (ret >= 0) {
320 mt9t031->rect = *rect;
321 mt9t031->xskip = xskip;
322 mt9t031->yskip = yskip;
323 }
324
325 return ret < 0 ? ret : 0;
326 }
327
328 static int mt9t031_s_crop(struct v4l2_subdev *sd, struct v4l2_crop *a)
329 {
330 struct v4l2_rect rect = a->c;
331 struct i2c_client *client = sd->priv;
332 struct mt9t031 *mt9t031 = to_mt9t031(client);
333 struct soc_camera_device *icd = client->dev.platform_data;
334
335 rect.width = ALIGN(rect.width, 2);
336 rect.height = ALIGN(rect.height, 2);
337
338 soc_camera_limit_side(&rect.left, &rect.width,
339 MT9T031_COLUMN_SKIP, MT9T031_MIN_WIDTH, MT9T031_MAX_WIDTH);
340
341 soc_camera_limit_side(&rect.top, &rect.height,
342 MT9T031_ROW_SKIP, MT9T031_MIN_HEIGHT, MT9T031_MAX_HEIGHT);
343
344 return mt9t031_set_params(icd, &rect, mt9t031->xskip, mt9t031->yskip);
345 }
346
347 static int mt9t031_g_crop(struct v4l2_subdev *sd, struct v4l2_crop *a)
348 {
349 struct i2c_client *client = sd->priv;
350 struct mt9t031 *mt9t031 = to_mt9t031(client);
351
352 a->c = mt9t031->rect;
353 a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
354
355 return 0;
356 }
357
358 static int mt9t031_cropcap(struct v4l2_subdev *sd, struct v4l2_cropcap *a)
359 {
360 a->bounds.left = MT9T031_COLUMN_SKIP;
361 a->bounds.top = MT9T031_ROW_SKIP;
362 a->bounds.width = MT9T031_MAX_WIDTH;
363 a->bounds.height = MT9T031_MAX_HEIGHT;
364 a->defrect = a->bounds;
365 a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
366 a->pixelaspect.numerator = 1;
367 a->pixelaspect.denominator = 1;
368
369 return 0;
370 }
371
372 static int mt9t031_g_fmt(struct v4l2_subdev *sd,
373 struct v4l2_mbus_framefmt *mf)
374 {
375 struct i2c_client *client = sd->priv;
376 struct mt9t031 *mt9t031 = to_mt9t031(client);
377
378 mf->width = mt9t031->rect.width / mt9t031->xskip;
379 mf->height = mt9t031->rect.height / mt9t031->yskip;
380 mf->code = V4L2_MBUS_FMT_SBGGR10_1X10;
381 mf->colorspace = V4L2_COLORSPACE_SRGB;
382 mf->field = V4L2_FIELD_NONE;
383
384 return 0;
385 }
386
387 static int mt9t031_s_fmt(struct v4l2_subdev *sd,
388 struct v4l2_mbus_framefmt *mf)
389 {
390 struct i2c_client *client = sd->priv;
391 struct mt9t031 *mt9t031 = to_mt9t031(client);
392 struct soc_camera_device *icd = client->dev.platform_data;
393 u16 xskip, yskip;
394 struct v4l2_rect rect = mt9t031->rect;
395
396 /*
397 * try_fmt has put width and height within limits.
398 * S_FMT: use binning and skipping for scaling
399 */
400 xskip = mt9t031_skip(&rect.width, mf->width, MT9T031_MAX_WIDTH);
401 yskip = mt9t031_skip(&rect.height, mf->height, MT9T031_MAX_HEIGHT);
402
403 mf->code = V4L2_MBUS_FMT_SBGGR10_1X10;
404 mf->colorspace = V4L2_COLORSPACE_SRGB;
405
406 /* mt9t031_set_params() doesn't change width and height */
407 return mt9t031_set_params(icd, &rect, xskip, yskip);
408 }
409
410 /*
411 * If a user window larger than sensor window is requested, we'll increase the
412 * sensor window.
413 */
414 static int mt9t031_try_fmt(struct v4l2_subdev *sd,
415 struct v4l2_mbus_framefmt *mf)
416 {
417 v4l_bound_align_image(
418 &mf->width, MT9T031_MIN_WIDTH, MT9T031_MAX_WIDTH, 1,
419 &mf->height, MT9T031_MIN_HEIGHT, MT9T031_MAX_HEIGHT, 1, 0);
420
421 mf->code = V4L2_MBUS_FMT_SBGGR10_1X10;
422 mf->colorspace = V4L2_COLORSPACE_SRGB;
423
424 return 0;
425 }
426
427 static int mt9t031_g_chip_ident(struct v4l2_subdev *sd,
428 struct v4l2_dbg_chip_ident *id)
429 {
430 struct i2c_client *client = sd->priv;
431 struct mt9t031 *mt9t031 = to_mt9t031(client);
432
433 if (id->match.type != V4L2_CHIP_MATCH_I2C_ADDR)
434 return -EINVAL;
435
436 if (id->match.addr != client->addr)
437 return -ENODEV;
438
439 id->ident = mt9t031->model;
440 id->revision = 0;
441
442 return 0;
443 }
444
445 #ifdef CONFIG_VIDEO_ADV_DEBUG
446 static int mt9t031_g_register(struct v4l2_subdev *sd,
447 struct v4l2_dbg_register *reg)
448 {
449 struct i2c_client *client = sd->priv;
450
451 if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
452 return -EINVAL;
453
454 if (reg->match.addr != client->addr)
455 return -ENODEV;
456
457 reg->val = reg_read(client, reg->reg);
458
459 if (reg->val > 0xffff)
460 return -EIO;
461
462 return 0;
463 }
464
465 static int mt9t031_s_register(struct v4l2_subdev *sd,
466 struct v4l2_dbg_register *reg)
467 {
468 struct i2c_client *client = sd->priv;
469
470 if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
471 return -EINVAL;
472
473 if (reg->match.addr != client->addr)
474 return -ENODEV;
475
476 if (reg_write(client, reg->reg, reg->val) < 0)
477 return -EIO;
478
479 return 0;
480 }
481 #endif
482
483 static const struct v4l2_queryctrl mt9t031_controls[] = {
484 {
485 .id = V4L2_CID_VFLIP,
486 .type = V4L2_CTRL_TYPE_BOOLEAN,
487 .name = "Flip Vertically",
488 .minimum = 0,
489 .maximum = 1,
490 .step = 1,
491 .default_value = 0,
492 }, {
493 .id = V4L2_CID_HFLIP,
494 .type = V4L2_CTRL_TYPE_BOOLEAN,
495 .name = "Flip Horizontally",
496 .minimum = 0,
497 .maximum = 1,
498 .step = 1,
499 .default_value = 0,
500 }, {
501 .id = V4L2_CID_GAIN,
502 .type = V4L2_CTRL_TYPE_INTEGER,
503 .name = "Gain",
504 .minimum = 0,
505 .maximum = 127,
506 .step = 1,
507 .default_value = 64,
508 .flags = V4L2_CTRL_FLAG_SLIDER,
509 }, {
510 .id = V4L2_CID_EXPOSURE,
511 .type = V4L2_CTRL_TYPE_INTEGER,
512 .name = "Exposure",
513 .minimum = 1,
514 .maximum = 255,
515 .step = 1,
516 .default_value = 255,
517 .flags = V4L2_CTRL_FLAG_SLIDER,
518 }, {
519 .id = V4L2_CID_EXPOSURE_AUTO,
520 .type = V4L2_CTRL_TYPE_BOOLEAN,
521 .name = "Automatic Exposure",
522 .minimum = 0,
523 .maximum = 1,
524 .step = 1,
525 .default_value = 1,
526 }
527 };
528
529 static struct soc_camera_ops mt9t031_ops = {
530 .set_bus_param = mt9t031_set_bus_param,
531 .query_bus_param = mt9t031_query_bus_param,
532 .controls = mt9t031_controls,
533 .num_controls = ARRAY_SIZE(mt9t031_controls),
534 };
535
536 static int mt9t031_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
537 {
538 struct i2c_client *client = sd->priv;
539 struct mt9t031 *mt9t031 = to_mt9t031(client);
540 int data;
541
542 switch (ctrl->id) {
543 case V4L2_CID_VFLIP:
544 data = reg_read(client, MT9T031_READ_MODE_2);
545 if (data < 0)
546 return -EIO;
547 ctrl->value = !!(data & 0x8000);
548 break;
549 case V4L2_CID_HFLIP:
550 data = reg_read(client, MT9T031_READ_MODE_2);
551 if (data < 0)
552 return -EIO;
553 ctrl->value = !!(data & 0x4000);
554 break;
555 case V4L2_CID_EXPOSURE_AUTO:
556 ctrl->value = mt9t031->autoexposure;
557 break;
558 case V4L2_CID_GAIN:
559 ctrl->value = mt9t031->gain;
560 break;
561 case V4L2_CID_EXPOSURE:
562 ctrl->value = mt9t031->exposure;
563 break;
564 }
565 return 0;
566 }
567
568 static int mt9t031_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
569 {
570 struct i2c_client *client = sd->priv;
571 struct mt9t031 *mt9t031 = to_mt9t031(client);
572 struct soc_camera_device *icd = client->dev.platform_data;
573 const struct v4l2_queryctrl *qctrl;
574 int data;
575
576 qctrl = soc_camera_find_qctrl(&mt9t031_ops, ctrl->id);
577
578 if (!qctrl)
579 return -EINVAL;
580
581 switch (ctrl->id) {
582 case V4L2_CID_VFLIP:
583 if (ctrl->value)
584 data = reg_set(client, MT9T031_READ_MODE_2, 0x8000);
585 else
586 data = reg_clear(client, MT9T031_READ_MODE_2, 0x8000);
587 if (data < 0)
588 return -EIO;
589 break;
590 case V4L2_CID_HFLIP:
591 if (ctrl->value)
592 data = reg_set(client, MT9T031_READ_MODE_2, 0x4000);
593 else
594 data = reg_clear(client, MT9T031_READ_MODE_2, 0x4000);
595 if (data < 0)
596 return -EIO;
597 break;
598 case V4L2_CID_GAIN:
599 if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum)
600 return -EINVAL;
601 /* See Datasheet Table 7, Gain settings. */
602 if (ctrl->value <= qctrl->default_value) {
603 /* Pack it into 0..1 step 0.125, register values 0..8 */
604 unsigned long range = qctrl->default_value - qctrl->minimum;
605 data = ((ctrl->value - qctrl->minimum) * 8 + range / 2) / range;
606
607 dev_dbg(&client->dev, "Setting gain %d\n", data);
608 data = reg_write(client, MT9T031_GLOBAL_GAIN, data);
609 if (data < 0)
610 return -EIO;
611 } else {
612 /* Pack it into 1.125..128 variable step, register values 9..0x7860 */
613 /* We assume qctrl->maximum - qctrl->default_value - 1 > 0 */
614 unsigned long range = qctrl->maximum - qctrl->default_value - 1;
615 /* calculated gain: map 65..127 to 9..1024 step 0.125 */
616 unsigned long gain = ((ctrl->value - qctrl->default_value - 1) *
617 1015 + range / 2) / range + 9;
618
619 if (gain <= 32) /* calculated gain 9..32 -> 9..32 */
620 data = gain;
621 else if (gain <= 64) /* calculated gain 33..64 -> 0x51..0x60 */
622 data = ((gain - 32) * 16 + 16) / 32 + 80;
623 else
624 /* calculated gain 65..1024 -> (1..120) << 8 + 0x60 */
625 data = (((gain - 64 + 7) * 32) & 0xff00) | 0x60;
626
627 dev_dbg(&client->dev, "Set gain from 0x%x to 0x%x\n",
628 reg_read(client, MT9T031_GLOBAL_GAIN), data);
629 data = reg_write(client, MT9T031_GLOBAL_GAIN, data);
630 if (data < 0)
631 return -EIO;
632 }
633
634 /* Success */
635 mt9t031->gain = ctrl->value;
636 break;
637 case V4L2_CID_EXPOSURE:
638 /* mt9t031 has maximum == default */
639 if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum)
640 return -EINVAL;
641 else {
642 const unsigned long range = qctrl->maximum - qctrl->minimum;
643 const u32 shutter = ((ctrl->value - qctrl->minimum) * 1048 +
644 range / 2) / range + 1;
645 u32 old;
646
647 get_shutter(client, &old);
648 dev_dbg(&client->dev, "Set shutter from %u to %u\n",
649 old, shutter);
650 if (set_shutter(client, shutter) < 0)
651 return -EIO;
652 mt9t031->exposure = ctrl->value;
653 mt9t031->autoexposure = 0;
654 }
655 break;
656 case V4L2_CID_EXPOSURE_AUTO:
657 if (ctrl->value) {
658 const u16 vblank = MT9T031_VERTICAL_BLANK;
659 const u32 shutter_max = MT9T031_MAX_HEIGHT + vblank;
660 unsigned int total_h = mt9t031->rect.height +
661 mt9t031->y_skip_top + vblank;
662
663 if (set_shutter(client, total_h) < 0)
664 return -EIO;
665 qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_EXPOSURE);
666 mt9t031->exposure = (shutter_max / 2 + (total_h - 1) *
667 (qctrl->maximum - qctrl->minimum)) /
668 shutter_max + qctrl->minimum;
669 mt9t031->autoexposure = 1;
670 } else
671 mt9t031->autoexposure = 0;
672 break;
673 }
674 return 0;
675 }
676
677 /*
678 * Interface active, can use i2c. If it fails, it can indeed mean, that
679 * this wasn't our capture interface, so, we wait for the right one
680 */
681 static int mt9t031_video_probe(struct i2c_client *client)
682 {
683 struct mt9t031 *mt9t031 = to_mt9t031(client);
684 s32 data;
685 int ret;
686
687 /* Enable the chip */
688 data = reg_write(client, MT9T031_CHIP_ENABLE, 1);
689 dev_dbg(&client->dev, "write: %d\n", data);
690
691 /* Read out the chip version register */
692 data = reg_read(client, MT9T031_CHIP_VERSION);
693
694 switch (data) {
695 case 0x1621:
696 mt9t031->model = V4L2_IDENT_MT9T031;
697 break;
698 default:
699 dev_err(&client->dev,
700 "No MT9T031 chip detected, register read %x\n", data);
701 return -ENODEV;
702 }
703
704 dev_info(&client->dev, "Detected a MT9T031 chip ID %x\n", data);
705
706 ret = mt9t031_idle(client);
707 if (ret < 0)
708 dev_err(&client->dev, "Failed to initialise the camera\n");
709
710 /* mt9t031_idle() has reset the chip to default. */
711 mt9t031->exposure = 255;
712 mt9t031->gain = 64;
713
714 return ret;
715 }
716
717 static int mt9t031_g_skip_top_lines(struct v4l2_subdev *sd, u32 *lines)
718 {
719 struct i2c_client *client = sd->priv;
720 struct mt9t031 *mt9t031 = to_mt9t031(client);
721
722 *lines = mt9t031->y_skip_top;
723
724 return 0;
725 }
726
727 static struct v4l2_subdev_core_ops mt9t031_subdev_core_ops = {
728 .g_ctrl = mt9t031_g_ctrl,
729 .s_ctrl = mt9t031_s_ctrl,
730 .g_chip_ident = mt9t031_g_chip_ident,
731 #ifdef CONFIG_VIDEO_ADV_DEBUG
732 .g_register = mt9t031_g_register,
733 .s_register = mt9t031_s_register,
734 #endif
735 };
736
737 static int mt9t031_enum_fmt(struct v4l2_subdev *sd, int index,
738 enum v4l2_mbus_pixelcode *code)
739 {
740 if (index)
741 return -EINVAL;
742
743 *code = V4L2_MBUS_FMT_SBGGR10_1X10;
744 return 0;
745 }
746
747 static struct v4l2_subdev_video_ops mt9t031_subdev_video_ops = {
748 .s_stream = mt9t031_s_stream,
749 .s_mbus_fmt = mt9t031_s_fmt,
750 .g_mbus_fmt = mt9t031_g_fmt,
751 .try_mbus_fmt = mt9t031_try_fmt,
752 .s_crop = mt9t031_s_crop,
753 .g_crop = mt9t031_g_crop,
754 .cropcap = mt9t031_cropcap,
755 .enum_mbus_fmt = mt9t031_enum_fmt,
756 };
757
758 static struct v4l2_subdev_sensor_ops mt9t031_subdev_sensor_ops = {
759 .g_skip_top_lines = mt9t031_g_skip_top_lines,
760 };
761
762 static struct v4l2_subdev_ops mt9t031_subdev_ops = {
763 .core = &mt9t031_subdev_core_ops,
764 .video = &mt9t031_subdev_video_ops,
765 .sensor = &mt9t031_subdev_sensor_ops,
766 };
767
768 static int mt9t031_probe(struct i2c_client *client,
769 const struct i2c_device_id *did)
770 {
771 struct mt9t031 *mt9t031;
772 struct soc_camera_device *icd = client->dev.platform_data;
773 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
774 struct soc_camera_link *icl;
775 int ret;
776
777 if (!icd) {
778 dev_err(&client->dev, "MT9T031: missing soc-camera data!\n");
779 return -EINVAL;
780 }
781
782 icl = to_soc_camera_link(icd);
783 if (!icl) {
784 dev_err(&client->dev, "MT9T031 driver needs platform data\n");
785 return -EINVAL;
786 }
787
788 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
789 dev_warn(&adapter->dev,
790 "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
791 return -EIO;
792 }
793
794 mt9t031 = kzalloc(sizeof(struct mt9t031), GFP_KERNEL);
795 if (!mt9t031)
796 return -ENOMEM;
797
798 v4l2_i2c_subdev_init(&mt9t031->subdev, client, &mt9t031_subdev_ops);
799
800 /* Second stage probe - when a capture adapter is there */
801 icd->ops = &mt9t031_ops;
802
803 mt9t031->y_skip_top = 0;
804 mt9t031->rect.left = MT9T031_COLUMN_SKIP;
805 mt9t031->rect.top = MT9T031_ROW_SKIP;
806 mt9t031->rect.width = MT9T031_MAX_WIDTH;
807 mt9t031->rect.height = MT9T031_MAX_HEIGHT;
808
809 /*
810 * Simulated autoexposure. If enabled, we calculate shutter width
811 * ourselves in the driver based on vertical blanking and frame width
812 */
813 mt9t031->autoexposure = 1;
814
815 mt9t031->xskip = 1;
816 mt9t031->yskip = 1;
817
818 mt9t031_idle(client);
819
820 ret = mt9t031_video_probe(client);
821
822 mt9t031_disable(client);
823
824 if (ret) {
825 icd->ops = NULL;
826 i2c_set_clientdata(client, NULL);
827 kfree(mt9t031);
828 }
829
830 return ret;
831 }
832
833 static int mt9t031_remove(struct i2c_client *client)
834 {
835 struct mt9t031 *mt9t031 = to_mt9t031(client);
836 struct soc_camera_device *icd = client->dev.platform_data;
837
838 icd->ops = NULL;
839 i2c_set_clientdata(client, NULL);
840 client->driver = NULL;
841 kfree(mt9t031);
842
843 return 0;
844 }
845
846 static const struct i2c_device_id mt9t031_id[] = {
847 { "mt9t031", 0 },
848 { }
849 };
850 MODULE_DEVICE_TABLE(i2c, mt9t031_id);
851
852 static struct i2c_driver mt9t031_i2c_driver = {
853 .driver = {
854 .name = "mt9t031",
855 },
856 .probe = mt9t031_probe,
857 .remove = mt9t031_remove,
858 .id_table = mt9t031_id,
859 };
860
861 static int __init mt9t031_mod_init(void)
862 {
863 return i2c_add_driver(&mt9t031_i2c_driver);
864 }
865
866 static void __exit mt9t031_mod_exit(void)
867 {
868 i2c_del_driver(&mt9t031_i2c_driver);
869 }
870
871 module_init(mt9t031_mod_init);
872 module_exit(mt9t031_mod_exit);
873
874 MODULE_DESCRIPTION("Micron MT9T031 Camera driver");
875 MODULE_AUTHOR("Guennadi Liakhovetski <lg@denx.de>");
876 MODULE_LICENSE("GPL v2");
Linux kernel - Deliverables
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