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Merge branch 'v6v7' into devel
[linux/fpc-iii.git] / drivers / media / video / mt9t031.c
blob7ce279c3751dbd2dd5379c454046473d7b0b775e
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/videodev2.h>
17
18 #include <media/soc_camera.h>
19 #include <media/v4l2-chip-ident.h>
20 #include <media/v4l2-subdev.h>
21
22 /*
23 * mt9t031 i2c address 0x5d
24 * The platform has to define i2c_board_info and link to it from
25 * struct soc_camera_link
26 */
27
28 /* mt9t031 selected register addresses */
29 #define MT9T031_CHIP_VERSION 0x00
30 #define MT9T031_ROW_START 0x01
31 #define MT9T031_COLUMN_START 0x02
32 #define MT9T031_WINDOW_HEIGHT 0x03
33 #define MT9T031_WINDOW_WIDTH 0x04
34 #define MT9T031_HORIZONTAL_BLANKING 0x05
35 #define MT9T031_VERTICAL_BLANKING 0x06
36 #define MT9T031_OUTPUT_CONTROL 0x07
37 #define MT9T031_SHUTTER_WIDTH_UPPER 0x08
38 #define MT9T031_SHUTTER_WIDTH 0x09
39 #define MT9T031_PIXEL_CLOCK_CONTROL 0x0a
40 #define MT9T031_FRAME_RESTART 0x0b
41 #define MT9T031_SHUTTER_DELAY 0x0c
42 #define MT9T031_RESET 0x0d
43 #define MT9T031_READ_MODE_1 0x1e
44 #define MT9T031_READ_MODE_2 0x20
45 #define MT9T031_READ_MODE_3 0x21
46 #define MT9T031_ROW_ADDRESS_MODE 0x22
47 #define MT9T031_COLUMN_ADDRESS_MODE 0x23
48 #define MT9T031_GLOBAL_GAIN 0x35
49 #define MT9T031_CHIP_ENABLE 0xF8
50
51 #define MT9T031_MAX_HEIGHT 1536
52 #define MT9T031_MAX_WIDTH 2048
53 #define MT9T031_MIN_HEIGHT 2
54 #define MT9T031_MIN_WIDTH 18
55 #define MT9T031_HORIZONTAL_BLANK 142
56 #define MT9T031_VERTICAL_BLANK 25
57 #define MT9T031_COLUMN_SKIP 32
58 #define MT9T031_ROW_SKIP 20
59
60 #define MT9T031_BUS_PARAM (SOCAM_PCLK_SAMPLE_RISING | \
61 SOCAM_PCLK_SAMPLE_FALLING | SOCAM_HSYNC_ACTIVE_HIGH | \
62 SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_DATA_ACTIVE_HIGH | \
63 SOCAM_MASTER | SOCAM_DATAWIDTH_10)
64
65 struct mt9t031 {
66 struct v4l2_subdev subdev;
67 struct v4l2_rect rect; /* Sensor window */
68 int model; /* V4L2_IDENT_MT9T031* codes from v4l2-chip-ident.h */
69 u16 xskip;
70 u16 yskip;
71 unsigned int gain;
72 unsigned short y_skip_top; /* Lines to skip at the top */
73 unsigned int exposure;
74 unsigned char autoexposure;
75 };
76
77 static struct mt9t031 *to_mt9t031(const struct i2c_client *client)
78 {
79 return container_of(i2c_get_clientdata(client), struct mt9t031, subdev);
80 }
81
82 static int reg_read(struct i2c_client *client, const u8 reg)
83 {
84 s32 data = i2c_smbus_read_word_data(client, reg);
85 return data < 0 ? data : swab16(data);
86 }
87
88 static int reg_write(struct i2c_client *client, const u8 reg,
89 const u16 data)
90 {
91 return i2c_smbus_write_word_data(client, reg, swab16(data));
92 }
93
94 static int reg_set(struct i2c_client *client, const u8 reg,
95 const u16 data)
96 {
97 int ret;
98
99 ret = reg_read(client, reg);
100 if (ret < 0)
101 return ret;
102 return reg_write(client, reg, ret | data);
103 }
104
105 static int reg_clear(struct i2c_client *client, const u8 reg,
106 const u16 data)
107 {
108 int ret;
109
110 ret = reg_read(client, reg);
111 if (ret < 0)
112 return ret;
113 return reg_write(client, reg, ret & ~data);
114 }
115
116 static int set_shutter(struct i2c_client *client, const u32 data)
117 {
118 int ret;
119
120 ret = reg_write(client, MT9T031_SHUTTER_WIDTH_UPPER, data >> 16);
121
122 if (ret >= 0)
123 ret = reg_write(client, MT9T031_SHUTTER_WIDTH, data & 0xffff);
124
125 return ret;
126 }
127
128 static int get_shutter(struct i2c_client *client, u32 *data)
129 {
130 int ret;
131
132 ret = reg_read(client, MT9T031_SHUTTER_WIDTH_UPPER);
133 *data = ret << 16;
134
135 if (ret >= 0)
136 ret = reg_read(client, MT9T031_SHUTTER_WIDTH);
137 *data |= ret & 0xffff;
138
139 return ret < 0 ? ret : 0;
140 }
141
142 static int mt9t031_idle(struct i2c_client *client)
143 {
144 int ret;
145
146 /* Disable chip output, synchronous option update */
147 ret = reg_write(client, MT9T031_RESET, 1);
148 if (ret >= 0)
149 ret = reg_write(client, MT9T031_RESET, 0);
150 if (ret >= 0)
151 ret = reg_clear(client, MT9T031_OUTPUT_CONTROL, 2);
152
153 return ret >= 0 ? 0 : -EIO;
154 }
155
156 static int mt9t031_disable(struct i2c_client *client)
157 {
158 /* Disable the chip */
159 reg_clear(client, MT9T031_OUTPUT_CONTROL, 2);
160
161 return 0;
162 }
163
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 static int mt9t031_set_bus_param(struct soc_camera_device *icd,
183 unsigned long flags)
184 {
185 struct i2c_client *client = to_i2c_client(to_soc_camera_control(icd));
186
187 /* The caller should have queried our parameters, check anyway */
188 if (flags & ~MT9T031_BUS_PARAM)
189 return -EINVAL;
190
191 if (flags & SOCAM_PCLK_SAMPLE_FALLING)
192 reg_clear(client, MT9T031_PIXEL_CLOCK_CONTROL, 0x8000);
193 else
194 reg_set(client, MT9T031_PIXEL_CLOCK_CONTROL, 0x8000);
195
196 return 0;
197 }
198
199 static unsigned long mt9t031_query_bus_param(struct soc_camera_device *icd)
200 {
201 struct soc_camera_link *icl = to_soc_camera_link(icd);
202
203 return soc_camera_apply_sensor_flags(icl, MT9T031_BUS_PARAM);
204 }
205
206 enum {
207 MT9T031_CTRL_VFLIP,
208 MT9T031_CTRL_HFLIP,
209 MT9T031_CTRL_GAIN,
210 MT9T031_CTRL_EXPOSURE,
211 MT9T031_CTRL_EXPOSURE_AUTO,
212 };
213
214 static const struct v4l2_queryctrl mt9t031_controls[] = {
215 [MT9T031_CTRL_VFLIP] = {
216 .id = V4L2_CID_VFLIP,
217 .type = V4L2_CTRL_TYPE_BOOLEAN,
218 .name = "Flip Vertically",
219 .minimum = 0,
220 .maximum = 1,
221 .step = 1,
222 .default_value = 0,
223 },
224 [MT9T031_CTRL_HFLIP] = {
225 .id = V4L2_CID_HFLIP,
226 .type = V4L2_CTRL_TYPE_BOOLEAN,
227 .name = "Flip Horizontally",
228 .minimum = 0,
229 .maximum = 1,
230 .step = 1,
231 .default_value = 0,
232 },
233 [MT9T031_CTRL_GAIN] = {
234 .id = V4L2_CID_GAIN,
235 .type = V4L2_CTRL_TYPE_INTEGER,
236 .name = "Gain",
237 .minimum = 0,
238 .maximum = 127,
239 .step = 1,
240 .default_value = 64,
241 .flags = V4L2_CTRL_FLAG_SLIDER,
242 },
243 [MT9T031_CTRL_EXPOSURE] = {
244 .id = V4L2_CID_EXPOSURE,
245 .type = V4L2_CTRL_TYPE_INTEGER,
246 .name = "Exposure",
247 .minimum = 1,
248 .maximum = 255,
249 .step = 1,
250 .default_value = 255,
251 .flags = V4L2_CTRL_FLAG_SLIDER,
252 },
253 [MT9T031_CTRL_EXPOSURE_AUTO] = {
254 .id = V4L2_CID_EXPOSURE_AUTO,
255 .type = V4L2_CTRL_TYPE_BOOLEAN,
256 .name = "Automatic Exposure",
257 .minimum = 0,
258 .maximum = 1,
259 .step = 1,
260 .default_value = 1,
261 }
262 };
263
264 static struct soc_camera_ops mt9t031_ops = {
265 .set_bus_param = mt9t031_set_bus_param,
266 .query_bus_param = mt9t031_query_bus_param,
267 .controls = mt9t031_controls,
268 .num_controls = ARRAY_SIZE(mt9t031_controls),
269 };
270
271 /* target must be _even_ */
272 static u16 mt9t031_skip(s32 *source, s32 target, s32 max)
273 {
274 unsigned int skip;
275
276 if (*source < target + target / 2) {
277 *source = target;
278 return 1;
279 }
280
281 skip = min(max, *source + target / 2) / target;
282 if (skip > 8)
283 skip = 8;
284 *source = target * skip;
285
286 return skip;
287 }
288
289 /* rect is the sensor rectangle, the caller guarantees parameter validity */
290 static int mt9t031_set_params(struct i2c_client *client,
291 struct v4l2_rect *rect, u16 xskip, u16 yskip)
292 {
293 struct mt9t031 *mt9t031 = to_mt9t031(client);
294 int ret;
295 u16 xbin, ybin;
296 const u16 hblank = MT9T031_HORIZONTAL_BLANK,
297 vblank = MT9T031_VERTICAL_BLANK;
298
299 xbin = min(xskip, (u16)3);
300 ybin = min(yskip, (u16)3);
301
302 /*
303 * Could just do roundup(rect->left, [xy]bin * 2); but this is cheaper.
304 * There is always a valid suitably aligned value. The worst case is
305 * xbin = 3, width = 2048. Then we will start at 36, the last read out
306 * pixel will be 2083, which is < 2085 - first black pixel.
307 *
308 * MT9T031 datasheet imposes window left border alignment, depending on
309 * the selected xskip. Failing to conform to this requirement produces
310 * dark horizontal stripes in the image. However, even obeying to this
311 * requirement doesn't eliminate the stripes in all configurations. They
312 * appear "locally reproducibly," but can differ between tests under
313 * different lighting conditions.
314 */
315 switch (xbin) {
316 case 1:
317 rect->left &= ~1;
318 break;
319 case 2:
320 rect->left &= ~3;
321 break;
322 case 3:
323 rect->left = rect->left > roundup(MT9T031_COLUMN_SKIP, 6) ?
324 (rect->left / 6) * 6 : roundup(MT9T031_COLUMN_SKIP, 6);
325 }
326
327 rect->top &= ~1;
328
329 dev_dbg(&client->dev, "skip %u:%u, rect %ux%u@%u:%u\n",
330 xskip, yskip, rect->width, rect->height, rect->left, rect->top);
331
332 /* Disable register update, reconfigure atomically */
333 ret = reg_set(client, MT9T031_OUTPUT_CONTROL, 1);
334 if (ret < 0)
335 return ret;
336
337 /* Blanking and start values - default... */
338 ret = reg_write(client, MT9T031_HORIZONTAL_BLANKING, hblank);
339 if (ret >= 0)
340 ret = reg_write(client, MT9T031_VERTICAL_BLANKING, vblank);
341
342 if (yskip != mt9t031->yskip || xskip != mt9t031->xskip) {
343 /* Binning, skipping */
344 if (ret >= 0)
345 ret = reg_write(client, MT9T031_COLUMN_ADDRESS_MODE,
346 ((xbin - 1) << 4) | (xskip - 1));
347 if (ret >= 0)
348 ret = reg_write(client, MT9T031_ROW_ADDRESS_MODE,
349 ((ybin - 1) << 4) | (yskip - 1));
350 }
351 dev_dbg(&client->dev, "new physical left %u, top %u\n",
352 rect->left, rect->top);
353
354 /*
355 * The caller provides a supported format, as guaranteed by
356 * icd->try_fmt_cap(), soc_camera_s_crop() and soc_camera_cropcap()
357 */
358 if (ret >= 0)
359 ret = reg_write(client, MT9T031_COLUMN_START, rect->left);
360 if (ret >= 0)
361 ret = reg_write(client, MT9T031_ROW_START, rect->top);
362 if (ret >= 0)
363 ret = reg_write(client, MT9T031_WINDOW_WIDTH, rect->width - 1);
364 if (ret >= 0)
365 ret = reg_write(client, MT9T031_WINDOW_HEIGHT,
366 rect->height + mt9t031->y_skip_top - 1);
367 if (ret >= 0 && mt9t031->autoexposure) {
368 unsigned int total_h = rect->height + mt9t031->y_skip_top + vblank;
369 ret = set_shutter(client, total_h);
370 if (ret >= 0) {
371 const u32 shutter_max = MT9T031_MAX_HEIGHT + vblank;
372 const struct v4l2_queryctrl *qctrl =
373 &mt9t031_controls[MT9T031_CTRL_EXPOSURE];
374 mt9t031->exposure = (shutter_max / 2 + (total_h - 1) *
375 (qctrl->maximum - qctrl->minimum)) /
376 shutter_max + qctrl->minimum;
377 }
378 }
379
380 /* Re-enable register update, commit all changes */
381 if (ret >= 0)
382 ret = reg_clear(client, MT9T031_OUTPUT_CONTROL, 1);
383
384 if (ret >= 0) {
385 mt9t031->rect = *rect;
386 mt9t031->xskip = xskip;
387 mt9t031->yskip = yskip;
388 }
389
390 return ret < 0 ? ret : 0;
391 }
392
393 static int mt9t031_s_crop(struct v4l2_subdev *sd, struct v4l2_crop *a)
394 {
395 struct v4l2_rect rect = a->c;
396 struct i2c_client *client = v4l2_get_subdevdata(sd);
397 struct mt9t031 *mt9t031 = to_mt9t031(client);
398
399 rect.width = ALIGN(rect.width, 2);
400 rect.height = ALIGN(rect.height, 2);
401
402 soc_camera_limit_side(&rect.left, &rect.width,
403 MT9T031_COLUMN_SKIP, MT9T031_MIN_WIDTH, MT9T031_MAX_WIDTH);
404
405 soc_camera_limit_side(&rect.top, &rect.height,
406 MT9T031_ROW_SKIP, MT9T031_MIN_HEIGHT, MT9T031_MAX_HEIGHT);
407
408 return mt9t031_set_params(client, &rect, mt9t031->xskip, mt9t031->yskip);
409 }
410
411 static int mt9t031_g_crop(struct v4l2_subdev *sd, struct v4l2_crop *a)
412 {
413 struct i2c_client *client = v4l2_get_subdevdata(sd);
414 struct mt9t031 *mt9t031 = to_mt9t031(client);
415
416 a->c = mt9t031->rect;
417 a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
418
419 return 0;
420 }
421
422 static int mt9t031_cropcap(struct v4l2_subdev *sd, struct v4l2_cropcap *a)
423 {
424 a->bounds.left = MT9T031_COLUMN_SKIP;
425 a->bounds.top = MT9T031_ROW_SKIP;
426 a->bounds.width = MT9T031_MAX_WIDTH;
427 a->bounds.height = MT9T031_MAX_HEIGHT;
428 a->defrect = a->bounds;
429 a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
430 a->pixelaspect.numerator = 1;
431 a->pixelaspect.denominator = 1;
432
433 return 0;
434 }
435
436 static int mt9t031_g_fmt(struct v4l2_subdev *sd,
437 struct v4l2_mbus_framefmt *mf)
438 {
439 struct i2c_client *client = v4l2_get_subdevdata(sd);
440 struct mt9t031 *mt9t031 = to_mt9t031(client);
441
442 mf->width = mt9t031->rect.width / mt9t031->xskip;
443 mf->height = mt9t031->rect.height / mt9t031->yskip;
444 mf->code = V4L2_MBUS_FMT_SBGGR10_1X10;
445 mf->colorspace = V4L2_COLORSPACE_SRGB;
446 mf->field = V4L2_FIELD_NONE;
447
448 return 0;
449 }
450
451 static int mt9t031_s_fmt(struct v4l2_subdev *sd,
452 struct v4l2_mbus_framefmt *mf)
453 {
454 struct i2c_client *client = v4l2_get_subdevdata(sd);
455 struct mt9t031 *mt9t031 = to_mt9t031(client);
456 u16 xskip, yskip;
457 struct v4l2_rect rect = mt9t031->rect;
458
459 /*
460 * try_fmt has put width and height within limits.
461 * S_FMT: use binning and skipping for scaling
462 */
463 xskip = mt9t031_skip(&rect.width, mf->width, MT9T031_MAX_WIDTH);
464 yskip = mt9t031_skip(&rect.height, mf->height, MT9T031_MAX_HEIGHT);
465
466 mf->code = V4L2_MBUS_FMT_SBGGR10_1X10;
467 mf->colorspace = V4L2_COLORSPACE_SRGB;
468
469 /* mt9t031_set_params() doesn't change width and height */
470 return mt9t031_set_params(client, &rect, xskip, yskip);
471 }
472
473 /*
474 * If a user window larger than sensor window is requested, we'll increase the
475 * sensor window.
476 */
477 static int mt9t031_try_fmt(struct v4l2_subdev *sd,
478 struct v4l2_mbus_framefmt *mf)
479 {
480 v4l_bound_align_image(
481 &mf->width, MT9T031_MIN_WIDTH, MT9T031_MAX_WIDTH, 1,
482 &mf->height, MT9T031_MIN_HEIGHT, MT9T031_MAX_HEIGHT, 1, 0);
483
484 mf->code = V4L2_MBUS_FMT_SBGGR10_1X10;
485 mf->colorspace = V4L2_COLORSPACE_SRGB;
486
487 return 0;
488 }
489
490 static int mt9t031_g_chip_ident(struct v4l2_subdev *sd,
491 struct v4l2_dbg_chip_ident *id)
492 {
493 struct i2c_client *client = v4l2_get_subdevdata(sd);
494 struct mt9t031 *mt9t031 = to_mt9t031(client);
495
496 if (id->match.type != V4L2_CHIP_MATCH_I2C_ADDR)
497 return -EINVAL;
498
499 if (id->match.addr != client->addr)
500 return -ENODEV;
501
502 id->ident = mt9t031->model;
503 id->revision = 0;
504
505 return 0;
506 }
507
508 #ifdef CONFIG_VIDEO_ADV_DEBUG
509 static int mt9t031_g_register(struct v4l2_subdev *sd,
510 struct v4l2_dbg_register *reg)
511 {
512 struct i2c_client *client = v4l2_get_subdevdata(sd);
513
514 if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
515 return -EINVAL;
516
517 if (reg->match.addr != client->addr)
518 return -ENODEV;
519
520 reg->val = reg_read(client, reg->reg);
521
522 if (reg->val > 0xffff)
523 return -EIO;
524
525 return 0;
526 }
527
528 static int mt9t031_s_register(struct v4l2_subdev *sd,
529 struct v4l2_dbg_register *reg)
530 {
531 struct i2c_client *client = v4l2_get_subdevdata(sd);
532
533 if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
534 return -EINVAL;
535
536 if (reg->match.addr != client->addr)
537 return -ENODEV;
538
539 if (reg_write(client, reg->reg, reg->val) < 0)
540 return -EIO;
541
542 return 0;
543 }
544 #endif
545
546 static int mt9t031_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
547 {
548 struct i2c_client *client = v4l2_get_subdevdata(sd);
549 struct mt9t031 *mt9t031 = to_mt9t031(client);
550 int data;
551
552 switch (ctrl->id) {
553 case V4L2_CID_VFLIP:
554 data = reg_read(client, MT9T031_READ_MODE_2);
555 if (data < 0)
556 return -EIO;
557 ctrl->value = !!(data & 0x8000);
558 break;
559 case V4L2_CID_HFLIP:
560 data = reg_read(client, MT9T031_READ_MODE_2);
561 if (data < 0)
562 return -EIO;
563 ctrl->value = !!(data & 0x4000);
564 break;
565 case V4L2_CID_EXPOSURE_AUTO:
566 ctrl->value = mt9t031->autoexposure;
567 break;
568 case V4L2_CID_GAIN:
569 ctrl->value = mt9t031->gain;
570 break;
571 case V4L2_CID_EXPOSURE:
572 ctrl->value = mt9t031->exposure;
573 break;
574 }
575 return 0;
576 }
577
578 static int mt9t031_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
579 {
580 struct i2c_client *client = v4l2_get_subdevdata(sd);
581 struct mt9t031 *mt9t031 = to_mt9t031(client);
582 const struct v4l2_queryctrl *qctrl;
583 int data;
584
585 switch (ctrl->id) {
586 case V4L2_CID_VFLIP:
587 if (ctrl->value)
588 data = reg_set(client, MT9T031_READ_MODE_2, 0x8000);
589 else
590 data = reg_clear(client, MT9T031_READ_MODE_2, 0x8000);
591 if (data < 0)
592 return -EIO;
593 break;
594 case V4L2_CID_HFLIP:
595 if (ctrl->value)
596 data = reg_set(client, MT9T031_READ_MODE_2, 0x4000);
597 else
598 data = reg_clear(client, MT9T031_READ_MODE_2, 0x4000);
599 if (data < 0)
600 return -EIO;
601 break;
602 case V4L2_CID_GAIN:
603 qctrl = &mt9t031_controls[MT9T031_CTRL_GAIN];
604 if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum)
605 return -EINVAL;
606 /* See Datasheet Table 7, Gain settings. */
607 if (ctrl->value <= qctrl->default_value) {
608 /* Pack it into 0..1 step 0.125, register values 0..8 */
609 unsigned long range = qctrl->default_value - qctrl->minimum;
610 data = ((ctrl->value - qctrl->minimum) * 8 + range / 2) / range;
611
612 dev_dbg(&client->dev, "Setting gain %d\n", data);
613 data = reg_write(client, MT9T031_GLOBAL_GAIN, data);
614 if (data < 0)
615 return -EIO;
616 } else {
617 /* Pack it into 1.125..128 variable step, register values 9..0x7860 */
618 /* We assume qctrl->maximum - qctrl->default_value - 1 > 0 */
619 unsigned long range = qctrl->maximum - qctrl->default_value - 1;
620 /* calculated gain: map 65..127 to 9..1024 step 0.125 */
621 unsigned long gain = ((ctrl->value - qctrl->default_value - 1) *
622 1015 + range / 2) / range + 9;
623
624 if (gain <= 32) /* calculated gain 9..32 -> 9..32 */
625 data = gain;
626 else if (gain <= 64) /* calculated gain 33..64 -> 0x51..0x60 */
627 data = ((gain - 32) * 16 + 16) / 32 + 80;
628 else
629 /* calculated gain 65..1024 -> (1..120) << 8 + 0x60 */
630 data = (((gain - 64 + 7) * 32) & 0xff00) | 0x60;
631
632 dev_dbg(&client->dev, "Set gain from 0x%x to 0x%x\n",
633 reg_read(client, MT9T031_GLOBAL_GAIN), data);
634 data = reg_write(client, MT9T031_GLOBAL_GAIN, data);
635 if (data < 0)
636 return -EIO;
637 }
638
639 /* Success */
640 mt9t031->gain = ctrl->value;
641 break;
642 case V4L2_CID_EXPOSURE:
643 qctrl = &mt9t031_controls[MT9T031_CTRL_EXPOSURE];
644 /* mt9t031 has maximum == default */
645 if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum)
646 return -EINVAL;
647 else {
648 const unsigned long range = qctrl->maximum - qctrl->minimum;
649 const u32 shutter = ((ctrl->value - qctrl->minimum) * 1048 +
650 range / 2) / range + 1;
651 u32 old;
652
653 get_shutter(client, &old);
654 dev_dbg(&client->dev, "Set shutter from %u to %u\n",
655 old, shutter);
656 if (set_shutter(client, shutter) < 0)
657 return -EIO;
658 mt9t031->exposure = ctrl->value;
659 mt9t031->autoexposure = 0;
660 }
661 break;
662 case V4L2_CID_EXPOSURE_AUTO:
663 if (ctrl->value) {
664 const u16 vblank = MT9T031_VERTICAL_BLANK;
665 const u32 shutter_max = MT9T031_MAX_HEIGHT + vblank;
666 unsigned int total_h = mt9t031->rect.height +
667 mt9t031->y_skip_top + vblank;
668
669 if (set_shutter(client, total_h) < 0)
670 return -EIO;
671 qctrl = &mt9t031_controls[MT9T031_CTRL_EXPOSURE];
672 mt9t031->exposure = (shutter_max / 2 + (total_h - 1) *
673 (qctrl->maximum - qctrl->minimum)) /
674 shutter_max + qctrl->minimum;
675 mt9t031->autoexposure = 1;
676 } else
677 mt9t031->autoexposure = 0;
678 break;
679 default:
680 return -EINVAL;
681 }
682 return 0;
683 }
684
685 /*
686 * Power Management:
687 * This function does nothing for now but must be present for pm to work
688 */
689 static int mt9t031_runtime_suspend(struct device *dev)
690 {
691 return 0;
692 }
693
694 /*
695 * Power Management:
696 * COLUMN_ADDRESS_MODE and ROW_ADDRESS_MODE are not rewritten if unchanged
697 * they are however changed at reset if the platform hook is present
698 * thus we rewrite them with the values stored by the driver
699 */
700 static int mt9t031_runtime_resume(struct device *dev)
701 {
702 struct video_device *vdev = to_video_device(dev);
703 struct soc_camera_device *icd = container_of(vdev->parent,
704 struct soc_camera_device, dev);
705 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
706 struct i2c_client *client = v4l2_get_subdevdata(sd);
707 struct mt9t031 *mt9t031 = to_mt9t031(client);
708
709 int ret;
710 u16 xbin, ybin;
711
712 xbin = min(mt9t031->xskip, (u16)3);
713 ybin = min(mt9t031->yskip, (u16)3);
714
715 ret = reg_write(client, MT9T031_COLUMN_ADDRESS_MODE,
716 ((xbin - 1) << 4) | (mt9t031->xskip - 1));
717 if (ret < 0)
718 return ret;
719
720 ret = reg_write(client, MT9T031_ROW_ADDRESS_MODE,
721 ((ybin - 1) << 4) | (mt9t031->yskip - 1));
722 if (ret < 0)
723 return ret;
724
725 return 0;
726 }
727
728 static struct dev_pm_ops mt9t031_dev_pm_ops = {
729 .runtime_suspend = mt9t031_runtime_suspend,
730 .runtime_resume = mt9t031_runtime_resume,
731 };
732
733 static struct device_type mt9t031_dev_type = {
734 .name = "MT9T031",
735 .pm = &mt9t031_dev_pm_ops,
736 };
737
738 /*
739 * Interface active, can use i2c. If it fails, it can indeed mean, that
740 * this wasn't our capture interface, so, we wait for the right one
741 */
742 static int mt9t031_video_probe(struct i2c_client *client)
743 {
744 struct mt9t031 *mt9t031 = to_mt9t031(client);
745 struct video_device *vdev = soc_camera_i2c_to_vdev(client);
746 s32 data;
747 int ret;
748
749 /* Enable the chip */
750 data = reg_write(client, MT9T031_CHIP_ENABLE, 1);
751 dev_dbg(&client->dev, "write: %d\n", data);
752
753 /* Read out the chip version register */
754 data = reg_read(client, MT9T031_CHIP_VERSION);
755
756 switch (data) {
757 case 0x1621:
758 mt9t031->model = V4L2_IDENT_MT9T031;
759 break;
760 default:
761 dev_err(&client->dev,
762 "No MT9T031 chip detected, register read %x\n", data);
763 return -ENODEV;
764 }
765
766 dev_info(&client->dev, "Detected a MT9T031 chip ID %x\n", data);
767
768 ret = mt9t031_idle(client);
769 if (ret < 0)
770 dev_err(&client->dev, "Failed to initialise the camera\n");
771 else
772 vdev->dev.type = &mt9t031_dev_type;
773
774 /* mt9t031_idle() has reset the chip to default. */
775 mt9t031->exposure = 255;
776 mt9t031->gain = 64;
777
778 return ret;
779 }
780
781 static int mt9t031_g_skip_top_lines(struct v4l2_subdev *sd, u32 *lines)
782 {
783 struct i2c_client *client = v4l2_get_subdevdata(sd);
784 struct mt9t031 *mt9t031 = to_mt9t031(client);
785
786 *lines = mt9t031->y_skip_top;
787
788 return 0;
789 }
790
791 static struct v4l2_subdev_core_ops mt9t031_subdev_core_ops = {
792 .g_ctrl = mt9t031_g_ctrl,
793 .s_ctrl = mt9t031_s_ctrl,
794 .g_chip_ident = mt9t031_g_chip_ident,
795 #ifdef CONFIG_VIDEO_ADV_DEBUG
796 .g_register = mt9t031_g_register,
797 .s_register = mt9t031_s_register,
798 #endif
799 };
800
801 static int mt9t031_enum_fmt(struct v4l2_subdev *sd, unsigned int index,
802 enum v4l2_mbus_pixelcode *code)
803 {
804 if (index)
805 return -EINVAL;
806
807 *code = V4L2_MBUS_FMT_SBGGR10_1X10;
808 return 0;
809 }
810
811 static struct v4l2_subdev_video_ops mt9t031_subdev_video_ops = {
812 .s_stream = mt9t031_s_stream,
813 .s_mbus_fmt = mt9t031_s_fmt,
814 .g_mbus_fmt = mt9t031_g_fmt,
815 .try_mbus_fmt = mt9t031_try_fmt,
816 .s_crop = mt9t031_s_crop,
817 .g_crop = mt9t031_g_crop,
818 .cropcap = mt9t031_cropcap,
819 .enum_mbus_fmt = mt9t031_enum_fmt,
820 };
821
822 static struct v4l2_subdev_sensor_ops mt9t031_subdev_sensor_ops = {
823 .g_skip_top_lines = mt9t031_g_skip_top_lines,
824 };
825
826 static struct v4l2_subdev_ops mt9t031_subdev_ops = {
827 .core = &mt9t031_subdev_core_ops,
828 .video = &mt9t031_subdev_video_ops,
829 .sensor = &mt9t031_subdev_sensor_ops,
830 };
831
832 static int mt9t031_probe(struct i2c_client *client,
833 const struct i2c_device_id *did)
834 {
835 struct mt9t031 *mt9t031;
836 struct soc_camera_device *icd = client->dev.platform_data;
837 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
838 int ret;
839
840 if (icd) {
841 struct soc_camera_link *icl = to_soc_camera_link(icd);
842 if (!icl) {
843 dev_err(&client->dev, "MT9T031 driver needs platform data\n");
844 return -EINVAL;
845 }
846
847 icd->ops = &mt9t031_ops;
848 }
849
850 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
851 dev_warn(&adapter->dev,
852 "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
853 return -EIO;
854 }
855
856 mt9t031 = kzalloc(sizeof(struct mt9t031), GFP_KERNEL);
857 if (!mt9t031)
858 return -ENOMEM;
859
860 v4l2_i2c_subdev_init(&mt9t031->subdev, client, &mt9t031_subdev_ops);
861
862 mt9t031->y_skip_top = 0;
863 mt9t031->rect.left = MT9T031_COLUMN_SKIP;
864 mt9t031->rect.top = MT9T031_ROW_SKIP;
865 mt9t031->rect.width = MT9T031_MAX_WIDTH;
866 mt9t031->rect.height = MT9T031_MAX_HEIGHT;
867
868 /*
869 * Simulated autoexposure. If enabled, we calculate shutter width
870 * ourselves in the driver based on vertical blanking and frame width
871 */
872 mt9t031->autoexposure = 1;
873
874 mt9t031->xskip = 1;
875 mt9t031->yskip = 1;
876
877 mt9t031_idle(client);
878
879 ret = mt9t031_video_probe(client);
880
881 mt9t031_disable(client);
882
883 if (ret) {
884 if (icd)
885 icd->ops = NULL;
886 kfree(mt9t031);
887 }
888
889 return ret;
890 }
891
892 static int mt9t031_remove(struct i2c_client *client)
893 {
894 struct mt9t031 *mt9t031 = to_mt9t031(client);
895 struct soc_camera_device *icd = client->dev.platform_data;
896
897 if (icd)
898 icd->ops = NULL;
899 kfree(mt9t031);
900
901 return 0;
902 }
903
904 static const struct i2c_device_id mt9t031_id[] = {
905 { "mt9t031", 0 },
906 { }
907 };
908 MODULE_DEVICE_TABLE(i2c, mt9t031_id);
909
910 static struct i2c_driver mt9t031_i2c_driver = {
911 .driver = {
912 .name = "mt9t031",
913 },
914 .probe = mt9t031_probe,
915 .remove = mt9t031_remove,
916 .id_table = mt9t031_id,
917 };
918
919 static int __init mt9t031_mod_init(void)
920 {
921 return i2c_add_driver(&mt9t031_i2c_driver);
922 }
923
924 static void __exit mt9t031_mod_exit(void)
925 {
926 i2c_del_driver(&mt9t031_i2c_driver);
927 }
928
929 module_init(mt9t031_mod_init);
930 module_exit(mt9t031_mod_exit);
931
932 MODULE_DESCRIPTION("Micron MT9T031 Camera driver");
933 MODULE_AUTHOR("Guennadi Liakhovetski <lg@denx.de>");
934 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support