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[ARM] pxa: Gumstix Verdex PCMCIA support
[linux-2.6/verdex.git] / drivers / media / video / mt9t031.c
blob6966f644977ed3be223e4be95170728e52078ddc
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 18
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 struct v4l2_rect rect; /* Sensor window */
73 int model; /* V4L2_IDENT_MT9T031* codes from v4l2-chip-ident.h */
74 u16 xskip;
75 u16 yskip;
76 unsigned int gain;
77 unsigned int exposure;
78 unsigned char autoexposure;
79 };
80
81 static struct mt9t031 *to_mt9t031(const struct i2c_client *client)
82 {
83 return container_of(i2c_get_clientdata(client), struct mt9t031, subdev);
84 }
85
86 static int reg_read(struct i2c_client *client, const u8 reg)
87 {
88 s32 data = i2c_smbus_read_word_data(client, reg);
89 return data < 0 ? data : swab16(data);
90 }
91
92 static int reg_write(struct i2c_client *client, const u8 reg,
93 const u16 data)
94 {
95 return i2c_smbus_write_word_data(client, reg, swab16(data));
96 }
97
98 static int reg_set(struct i2c_client *client, const u8 reg,
99 const u16 data)
100 {
101 int ret;
102
103 ret = reg_read(client, reg);
104 if (ret < 0)
105 return ret;
106 return reg_write(client, reg, ret | data);
107 }
108
109 static int reg_clear(struct i2c_client *client, const u8 reg,
110 const u16 data)
111 {
112 int ret;
113
114 ret = reg_read(client, reg);
115 if (ret < 0)
116 return ret;
117 return reg_write(client, reg, ret & ~data);
118 }
119
120 static int set_shutter(struct i2c_client *client, const u32 data)
121 {
122 int ret;
123
124 ret = reg_write(client, MT9T031_SHUTTER_WIDTH_UPPER, data >> 16);
125
126 if (ret >= 0)
127 ret = reg_write(client, MT9T031_SHUTTER_WIDTH, data & 0xffff);
128
129 return ret;
130 }
131
132 static int get_shutter(struct i2c_client *client, u32 *data)
133 {
134 int ret;
135
136 ret = reg_read(client, MT9T031_SHUTTER_WIDTH_UPPER);
137 *data = ret << 16;
138
139 if (ret >= 0)
140 ret = reg_read(client, MT9T031_SHUTTER_WIDTH);
141 *data |= ret & 0xffff;
142
143 return ret < 0 ? ret : 0;
144 }
145
146 static int mt9t031_idle(struct i2c_client *client)
147 {
148 int ret;
149
150 /* Disable chip output, synchronous option update */
151 ret = reg_write(client, MT9T031_RESET, 1);
152 if (ret >= 0)
153 ret = reg_write(client, MT9T031_RESET, 0);
154 if (ret >= 0)
155 ret = reg_clear(client, MT9T031_OUTPUT_CONTROL, 2);
156
157 return ret >= 0 ? 0 : -EIO;
158 }
159
160 static int mt9t031_disable(struct i2c_client *client)
161 {
162 /* Disable the chip */
163 reg_clear(client, MT9T031_OUTPUT_CONTROL, 2);
164
165 return 0;
166 }
167
168 static int mt9t031_s_stream(struct v4l2_subdev *sd, int enable)
169 {
170 struct i2c_client *client = sd->priv;
171 int ret;
172
173 if (enable)
174 /* Switch to master "normal" mode */
175 ret = reg_set(client, MT9T031_OUTPUT_CONTROL, 2);
176 else
177 /* Stop sensor readout */
178 ret = reg_clear(client, MT9T031_OUTPUT_CONTROL, 2);
179
180 if (ret < 0)
181 return -EIO;
182
183 return 0;
184 }
185
186 static int mt9t031_set_bus_param(struct soc_camera_device *icd,
187 unsigned long flags)
188 {
189 struct i2c_client *client = to_i2c_client(to_soc_camera_control(icd));
190
191 /* The caller should have queried our parameters, check anyway */
192 if (flags & ~MT9T031_BUS_PARAM)
193 return -EINVAL;
194
195 if (flags & SOCAM_PCLK_SAMPLE_FALLING)
196 reg_clear(client, MT9T031_PIXEL_CLOCK_CONTROL, 0x8000);
197 else
198 reg_set(client, MT9T031_PIXEL_CLOCK_CONTROL, 0x8000);
199
200 return 0;
201 }
202
203 static unsigned long mt9t031_query_bus_param(struct soc_camera_device *icd)
204 {
205 struct soc_camera_link *icl = to_soc_camera_link(icd);
206
207 return soc_camera_apply_sensor_flags(icl, MT9T031_BUS_PARAM);
208 }
209
210 /* target must be _even_ */
211 static u16 mt9t031_skip(s32 *source, s32 target, s32 max)
212 {
213 unsigned int skip;
214
215 if (*source < target + target / 2) {
216 *source = target;
217 return 1;
218 }
219
220 skip = min(max, *source + target / 2) / target;
221 if (skip > 8)
222 skip = 8;
223 *source = target * skip;
224
225 return skip;
226 }
227
228 /* rect is the sensor rectangle, the caller guarantees parameter validity */
229 static int mt9t031_set_params(struct soc_camera_device *icd,
230 struct v4l2_rect *rect, u16 xskip, u16 yskip)
231 {
232 struct i2c_client *client = to_i2c_client(to_soc_camera_control(icd));
233 struct mt9t031 *mt9t031 = to_mt9t031(client);
234 int ret;
235 u16 xbin, ybin;
236 const u16 hblank = MT9T031_HORIZONTAL_BLANK,
237 vblank = MT9T031_VERTICAL_BLANK;
238
239 xbin = min(xskip, (u16)3);
240 ybin = min(yskip, (u16)3);
241
242 /*
243 * Could just do roundup(rect->left, [xy]bin * 2); but this is cheaper.
244 * There is always a valid suitably aligned value. The worst case is
245 * xbin = 3, width = 2048. Then we will start at 36, the last read out
246 * pixel will be 2083, which is < 2085 - first black pixel.
247 *
248 * MT9T031 datasheet imposes window left border alignment, depending on
249 * the selected xskip. Failing to conform to this requirement produces
250 * dark horizontal stripes in the image. However, even obeying to this
251 * requirement doesn't eliminate the stripes in all configurations. They
252 * appear "locally reproducibly," but can differ between tests under
253 * different lighting conditions.
254 */
255 switch (xbin) {
256 case 1:
257 rect->left &= ~1;
258 break;
259 case 2:
260 rect->left &= ~3;
261 break;
262 case 3:
263 rect->left = rect->left > roundup(MT9T031_COLUMN_SKIP, 6) ?
264 (rect->left / 6) * 6 : roundup(MT9T031_COLUMN_SKIP, 6);
265 }
266
267 rect->top &= ~1;
268
269 dev_dbg(&client->dev, "skip %u:%u, rect %ux%u@%u:%u\n",
270 xskip, yskip, rect->width, rect->height, rect->left, rect->top);
271
272 /* Disable register update, reconfigure atomically */
273 ret = reg_set(client, MT9T031_OUTPUT_CONTROL, 1);
274 if (ret < 0)
275 return ret;
276
277 /* Blanking and start values - default... */
278 ret = reg_write(client, MT9T031_HORIZONTAL_BLANKING, hblank);
279 if (ret >= 0)
280 ret = reg_write(client, MT9T031_VERTICAL_BLANKING, vblank);
281
282 if (yskip != mt9t031->yskip || xskip != mt9t031->xskip) {
283 /* Binning, skipping */
284 if (ret >= 0)
285 ret = reg_write(client, MT9T031_COLUMN_ADDRESS_MODE,
286 ((xbin - 1) << 4) | (xskip - 1));
287 if (ret >= 0)
288 ret = reg_write(client, MT9T031_ROW_ADDRESS_MODE,
289 ((ybin - 1) << 4) | (yskip - 1));
290 }
291 dev_dbg(&client->dev, "new physical left %u, top %u\n",
292 rect->left, rect->top);
293
294 /* The caller provides a supported format, as guaranteed by
295 * icd->try_fmt_cap(), soc_camera_s_crop() and soc_camera_cropcap() */
296 if (ret >= 0)
297 ret = reg_write(client, MT9T031_COLUMN_START, rect->left);
298 if (ret >= 0)
299 ret = reg_write(client, MT9T031_ROW_START, rect->top);
300 if (ret >= 0)
301 ret = reg_write(client, MT9T031_WINDOW_WIDTH, rect->width - 1);
302 if (ret >= 0)
303 ret = reg_write(client, MT9T031_WINDOW_HEIGHT,
304 rect->height + icd->y_skip_top - 1);
305 if (ret >= 0 && mt9t031->autoexposure) {
306 unsigned int total_h = rect->height + icd->y_skip_top + vblank;
307 ret = set_shutter(client, total_h);
308 if (ret >= 0) {
309 const u32 shutter_max = MT9T031_MAX_HEIGHT + vblank;
310 const struct v4l2_queryctrl *qctrl =
311 soc_camera_find_qctrl(icd->ops,
312 V4L2_CID_EXPOSURE);
313 mt9t031->exposure = (shutter_max / 2 + (total_h - 1) *
314 (qctrl->maximum - qctrl->minimum)) /
315 shutter_max + qctrl->minimum;
316 }
317 }
318
319 /* Re-enable register update, commit all changes */
320 if (ret >= 0)
321 ret = reg_clear(client, MT9T031_OUTPUT_CONTROL, 1);
322
323 if (ret >= 0) {
324 mt9t031->rect = *rect;
325 mt9t031->xskip = xskip;
326 mt9t031->yskip = yskip;
327 }
328
329 return ret < 0 ? ret : 0;
330 }
331
332 static int mt9t031_s_crop(struct v4l2_subdev *sd, struct v4l2_crop *a)
333 {
334 struct v4l2_rect rect = a->c;
335 struct i2c_client *client = sd->priv;
336 struct mt9t031 *mt9t031 = to_mt9t031(client);
337 struct soc_camera_device *icd = client->dev.platform_data;
338
339 rect.width = ALIGN(rect.width, 2);
340 rect.height = ALIGN(rect.height, 2);
341
342 soc_camera_limit_side(&rect.left, &rect.width,
343 MT9T031_COLUMN_SKIP, MT9T031_MIN_WIDTH, MT9T031_MAX_WIDTH);
344
345 soc_camera_limit_side(&rect.top, &rect.height,
346 MT9T031_ROW_SKIP, MT9T031_MIN_HEIGHT, MT9T031_MAX_HEIGHT);
347
348 return mt9t031_set_params(icd, &rect, mt9t031->xskip, mt9t031->yskip);
349 }
350
351 static int mt9t031_g_crop(struct v4l2_subdev *sd, struct v4l2_crop *a)
352 {
353 struct i2c_client *client = sd->priv;
354 struct mt9t031 *mt9t031 = to_mt9t031(client);
355
356 a->c = mt9t031->rect;
357 a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
358
359 return 0;
360 }
361
362 static int mt9t031_cropcap(struct v4l2_subdev *sd, struct v4l2_cropcap *a)
363 {
364 a->bounds.left = MT9T031_COLUMN_SKIP;
365 a->bounds.top = MT9T031_ROW_SKIP;
366 a->bounds.width = MT9T031_MAX_WIDTH;
367 a->bounds.height = MT9T031_MAX_HEIGHT;
368 a->defrect = a->bounds;
369 a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
370 a->pixelaspect.numerator = 1;
371 a->pixelaspect.denominator = 1;
372
373 return 0;
374 }
375
376 static int mt9t031_g_fmt(struct v4l2_subdev *sd, struct v4l2_format *f)
377 {
378 struct i2c_client *client = sd->priv;
379 struct mt9t031 *mt9t031 = to_mt9t031(client);
380 struct v4l2_pix_format *pix = &f->fmt.pix;
381
382 pix->width = mt9t031->rect.width / mt9t031->xskip;
383 pix->height = mt9t031->rect.height / mt9t031->yskip;
384 pix->pixelformat = V4L2_PIX_FMT_SGRBG10;
385 pix->field = V4L2_FIELD_NONE;
386 pix->colorspace = V4L2_COLORSPACE_SRGB;
387
388 return 0;
389 }
390
391 static int mt9t031_s_fmt(struct v4l2_subdev *sd, struct v4l2_format *f)
392 {
393 struct i2c_client *client = sd->priv;
394 struct mt9t031 *mt9t031 = to_mt9t031(client);
395 struct soc_camera_device *icd = client->dev.platform_data;
396 struct v4l2_pix_format *pix = &f->fmt.pix;
397 u16 xskip, yskip;
398 struct v4l2_rect rect = mt9t031->rect;
399
400 /*
401 * try_fmt has put width and height within limits.
402 * S_FMT: use binning and skipping for scaling
403 */
404 xskip = mt9t031_skip(&rect.width, pix->width, MT9T031_MAX_WIDTH);
405 yskip = mt9t031_skip(&rect.height, pix->height, MT9T031_MAX_HEIGHT);
406
407 /* mt9t031_set_params() doesn't change width and height */
408 return mt9t031_set_params(icd, &rect, xskip, yskip);
409 }
410
411 /*
412 * If a user window larger than sensor window is requested, we'll increase the
413 * sensor window.
414 */
415 static int mt9t031_try_fmt(struct v4l2_subdev *sd, struct v4l2_format *f)
416 {
417 struct v4l2_pix_format *pix = &f->fmt.pix;
418
419 v4l_bound_align_image(
420 &pix->width, MT9T031_MIN_WIDTH, MT9T031_MAX_WIDTH, 1,
421 &pix->height, MT9T031_MIN_HEIGHT, MT9T031_MAX_HEIGHT, 1, 0);
422
423 return 0;
424 }
425
426 static int mt9t031_g_chip_ident(struct v4l2_subdev *sd,
427 struct v4l2_dbg_chip_ident *id)
428 {
429 struct i2c_client *client = sd->priv;
430 struct mt9t031 *mt9t031 = to_mt9t031(client);
431
432 if (id->match.type != V4L2_CHIP_MATCH_I2C_ADDR)
433 return -EINVAL;
434
435 if (id->match.addr != client->addr)
436 return -ENODEV;
437
438 id->ident = mt9t031->model;
439 id->revision = 0;
440
441 return 0;
442 }
443
444 #ifdef CONFIG_VIDEO_ADV_DEBUG
445 static int mt9t031_g_register(struct v4l2_subdev *sd,
446 struct v4l2_dbg_register *reg)
447 {
448 struct i2c_client *client = sd->priv;
449
450 if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
451 return -EINVAL;
452
453 if (reg->match.addr != client->addr)
454 return -ENODEV;
455
456 reg->val = reg_read(client, reg->reg);
457
458 if (reg->val > 0xffff)
459 return -EIO;
460
461 return 0;
462 }
463
464 static int mt9t031_s_register(struct v4l2_subdev *sd,
465 struct v4l2_dbg_register *reg)
466 {
467 struct i2c_client *client = sd->priv;
468
469 if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
470 return -EINVAL;
471
472 if (reg->match.addr != client->addr)
473 return -ENODEV;
474
475 if (reg_write(client, reg->reg, reg->val) < 0)
476 return -EIO;
477
478 return 0;
479 }
480 #endif
481
482 static const struct v4l2_queryctrl mt9t031_controls[] = {
483 {
484 .id = V4L2_CID_VFLIP,
485 .type = V4L2_CTRL_TYPE_BOOLEAN,
486 .name = "Flip Vertically",
487 .minimum = 0,
488 .maximum = 1,
489 .step = 1,
490 .default_value = 0,
491 }, {
492 .id = V4L2_CID_HFLIP,
493 .type = V4L2_CTRL_TYPE_BOOLEAN,
494 .name = "Flip Horizontally",
495 .minimum = 0,
496 .maximum = 1,
497 .step = 1,
498 .default_value = 0,
499 }, {
500 .id = V4L2_CID_GAIN,
501 .type = V4L2_CTRL_TYPE_INTEGER,
502 .name = "Gain",
503 .minimum = 0,
504 .maximum = 127,
505 .step = 1,
506 .default_value = 64,
507 .flags = V4L2_CTRL_FLAG_SLIDER,
508 }, {
509 .id = V4L2_CID_EXPOSURE,
510 .type = V4L2_CTRL_TYPE_INTEGER,
511 .name = "Exposure",
512 .minimum = 1,
513 .maximum = 255,
514 .step = 1,
515 .default_value = 255,
516 .flags = V4L2_CTRL_FLAG_SLIDER,
517 }, {
518 .id = V4L2_CID_EXPOSURE_AUTO,
519 .type = V4L2_CTRL_TYPE_BOOLEAN,
520 .name = "Automatic Exposure",
521 .minimum = 0,
522 .maximum = 1,
523 .step = 1,
524 .default_value = 1,
525 }
526 };
527
528 static struct soc_camera_ops mt9t031_ops = {
529 .set_bus_param = mt9t031_set_bus_param,
530 .query_bus_param = mt9t031_query_bus_param,
531 .controls = mt9t031_controls,
532 .num_controls = ARRAY_SIZE(mt9t031_controls),
533 };
534
535 static int mt9t031_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
536 {
537 struct i2c_client *client = sd->priv;
538 struct mt9t031 *mt9t031 = to_mt9t031(client);
539 int data;
540
541 switch (ctrl->id) {
542 case V4L2_CID_VFLIP:
543 data = reg_read(client, MT9T031_READ_MODE_2);
544 if (data < 0)
545 return -EIO;
546 ctrl->value = !!(data & 0x8000);
547 break;
548 case V4L2_CID_HFLIP:
549 data = reg_read(client, MT9T031_READ_MODE_2);
550 if (data < 0)
551 return -EIO;
552 ctrl->value = !!(data & 0x4000);
553 break;
554 case V4L2_CID_EXPOSURE_AUTO:
555 ctrl->value = mt9t031->autoexposure;
556 break;
557 case V4L2_CID_GAIN:
558 ctrl->value = mt9t031->gain;
559 break;
560 case V4L2_CID_EXPOSURE:
561 ctrl->value = mt9t031->exposure;
562 break;
563 }
564 return 0;
565 }
566
567 static int mt9t031_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
568 {
569 struct i2c_client *client = sd->priv;
570 struct mt9t031 *mt9t031 = to_mt9t031(client);
571 struct soc_camera_device *icd = client->dev.platform_data;
572 const struct v4l2_queryctrl *qctrl;
573 int data;
574
575 qctrl = soc_camera_find_qctrl(&mt9t031_ops, ctrl->id);
576
577 if (!qctrl)
578 return -EINVAL;
579
580 switch (ctrl->id) {
581 case V4L2_CID_VFLIP:
582 if (ctrl->value)
583 data = reg_set(client, MT9T031_READ_MODE_2, 0x8000);
584 else
585 data = reg_clear(client, MT9T031_READ_MODE_2, 0x8000);
586 if (data < 0)
587 return -EIO;
588 break;
589 case V4L2_CID_HFLIP:
590 if (ctrl->value)
591 data = reg_set(client, MT9T031_READ_MODE_2, 0x4000);
592 else
593 data = reg_clear(client, MT9T031_READ_MODE_2, 0x4000);
594 if (data < 0)
595 return -EIO;
596 break;
597 case V4L2_CID_GAIN:
598 if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum)
599 return -EINVAL;
600 /* See Datasheet Table 7, Gain settings. */
601 if (ctrl->value <= qctrl->default_value) {
602 /* Pack it into 0..1 step 0.125, register values 0..8 */
603 unsigned long range = qctrl->default_value - qctrl->minimum;
604 data = ((ctrl->value - qctrl->minimum) * 8 + range / 2) / range;
605
606 dev_dbg(&client->dev, "Setting gain %d\n", data);
607 data = reg_write(client, MT9T031_GLOBAL_GAIN, data);
608 if (data < 0)
609 return -EIO;
610 } else {
611 /* Pack it into 1.125..128 variable step, register values 9..0x7860 */
612 /* We assume qctrl->maximum - qctrl->default_value - 1 > 0 */
613 unsigned long range = qctrl->maximum - qctrl->default_value - 1;
614 /* calculated gain: map 65..127 to 9..1024 step 0.125 */
615 unsigned long gain = ((ctrl->value - qctrl->default_value - 1) *
616 1015 + range / 2) / range + 9;
617
618 if (gain <= 32) /* calculated gain 9..32 -> 9..32 */
619 data = gain;
620 else if (gain <= 64) /* calculated gain 33..64 -> 0x51..0x60 */
621 data = ((gain - 32) * 16 + 16) / 32 + 80;
622 else
623 /* calculated gain 65..1024 -> (1..120) << 8 + 0x60 */
624 data = (((gain - 64 + 7) * 32) & 0xff00) | 0x60;
625
626 dev_dbg(&client->dev, "Set gain from 0x%x to 0x%x\n",
627 reg_read(client, MT9T031_GLOBAL_GAIN), data);
628 data = reg_write(client, MT9T031_GLOBAL_GAIN, data);
629 if (data < 0)
630 return -EIO;
631 }
632
633 /* Success */
634 mt9t031->gain = ctrl->value;
635 break;
636 case V4L2_CID_EXPOSURE:
637 /* mt9t031 has maximum == default */
638 if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum)
639 return -EINVAL;
640 else {
641 const unsigned long range = qctrl->maximum - qctrl->minimum;
642 const u32 shutter = ((ctrl->value - qctrl->minimum) * 1048 +
643 range / 2) / range + 1;
644 u32 old;
645
646 get_shutter(client, &old);
647 dev_dbg(&client->dev, "Set shutter from %u to %u\n",
648 old, shutter);
649 if (set_shutter(client, shutter) < 0)
650 return -EIO;
651 mt9t031->exposure = ctrl->value;
652 mt9t031->autoexposure = 0;
653 }
654 break;
655 case V4L2_CID_EXPOSURE_AUTO:
656 if (ctrl->value) {
657 const u16 vblank = MT9T031_VERTICAL_BLANK;
658 const u32 shutter_max = MT9T031_MAX_HEIGHT + vblank;
659 unsigned int total_h = mt9t031->rect.height +
660 icd->y_skip_top + vblank;
661
662 if (set_shutter(client, total_h) < 0)
663 return -EIO;
664 qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_EXPOSURE);
665 mt9t031->exposure = (shutter_max / 2 + (total_h - 1) *
666 (qctrl->maximum - qctrl->minimum)) /
667 shutter_max + qctrl->minimum;
668 mt9t031->autoexposure = 1;
669 } else
670 mt9t031->autoexposure = 0;
671 break;
672 }
673 return 0;
674 }
675
676 /* Interface active, can use i2c. If it fails, it can indeed mean, that
677 * this wasn't our capture interface, so, we wait for the right one */
678 static int mt9t031_video_probe(struct i2c_client *client)
679 {
680 struct soc_camera_device *icd = client->dev.platform_data;
681 struct mt9t031 *mt9t031 = to_mt9t031(client);
682 s32 data;
683 int ret;
684
685 /* Enable the chip */
686 data = reg_write(client, MT9T031_CHIP_ENABLE, 1);
687 dev_dbg(&client->dev, "write: %d\n", data);
688
689 /* Read out the chip version register */
690 data = reg_read(client, MT9T031_CHIP_VERSION);
691
692 switch (data) {
693 case 0x1621:
694 mt9t031->model = V4L2_IDENT_MT9T031;
695 icd->formats = mt9t031_colour_formats;
696 icd->num_formats = ARRAY_SIZE(mt9t031_colour_formats);
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 struct v4l2_subdev_core_ops mt9t031_subdev_core_ops = {
718 .g_ctrl = mt9t031_g_ctrl,
719 .s_ctrl = mt9t031_s_ctrl,
720 .g_chip_ident = mt9t031_g_chip_ident,
721 #ifdef CONFIG_VIDEO_ADV_DEBUG
722 .g_register = mt9t031_g_register,
723 .s_register = mt9t031_s_register,
724 #endif
725 };
726
727 static struct v4l2_subdev_video_ops mt9t031_subdev_video_ops = {
728 .s_stream = mt9t031_s_stream,
729 .s_fmt = mt9t031_s_fmt,
730 .g_fmt = mt9t031_g_fmt,
731 .try_fmt = mt9t031_try_fmt,
732 .s_crop = mt9t031_s_crop,
733 .g_crop = mt9t031_g_crop,
734 .cropcap = mt9t031_cropcap,
735 };
736
737 static struct v4l2_subdev_ops mt9t031_subdev_ops = {
738 .core = &mt9t031_subdev_core_ops,
739 .video = &mt9t031_subdev_video_ops,
740 };
741
742 static int mt9t031_probe(struct i2c_client *client,
743 const struct i2c_device_id *did)
744 {
745 struct mt9t031 *mt9t031;
746 struct soc_camera_device *icd = client->dev.platform_data;
747 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
748 struct soc_camera_link *icl;
749 int ret;
750
751 if (!icd) {
752 dev_err(&client->dev, "MT9T031: missing soc-camera data!\n");
753 return -EINVAL;
754 }
755
756 icl = to_soc_camera_link(icd);
757 if (!icl) {
758 dev_err(&client->dev, "MT9T031 driver needs platform data\n");
759 return -EINVAL;
760 }
761
762 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
763 dev_warn(&adapter->dev,
764 "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
765 return -EIO;
766 }
767
768 mt9t031 = kzalloc(sizeof(struct mt9t031), GFP_KERNEL);
769 if (!mt9t031)
770 return -ENOMEM;
771
772 v4l2_i2c_subdev_init(&mt9t031->subdev, client, &mt9t031_subdev_ops);
773
774 /* Second stage probe - when a capture adapter is there */
775 icd->ops = &mt9t031_ops;
776 icd->y_skip_top = 0;
777
778 mt9t031->rect.left = MT9T031_COLUMN_SKIP;
779 mt9t031->rect.top = MT9T031_ROW_SKIP;
780 mt9t031->rect.width = MT9T031_MAX_WIDTH;
781 mt9t031->rect.height = MT9T031_MAX_HEIGHT;
782
783 /* Simulated autoexposure. If enabled, we calculate shutter width
784 * ourselves in the driver based on vertical blanking and frame width */
785 mt9t031->autoexposure = 1;
786
787 mt9t031->xskip = 1;
788 mt9t031->yskip = 1;
789
790 mt9t031_idle(client);
791
792 ret = mt9t031_video_probe(client);
793
794 mt9t031_disable(client);
795
796 if (ret) {
797 icd->ops = NULL;
798 i2c_set_clientdata(client, NULL);
799 kfree(mt9t031);
800 }
801
802 return ret;
803 }
804
805 static int mt9t031_remove(struct i2c_client *client)
806 {
807 struct mt9t031 *mt9t031 = to_mt9t031(client);
808 struct soc_camera_device *icd = client->dev.platform_data;
809
810 icd->ops = NULL;
811 i2c_set_clientdata(client, NULL);
812 client->driver = NULL;
813 kfree(mt9t031);
814
815 return 0;
816 }
817
818 static const struct i2c_device_id mt9t031_id[] = {
819 { "mt9t031", 0 },
820 { }
821 };
822 MODULE_DEVICE_TABLE(i2c, mt9t031_id);
823
824 static struct i2c_driver mt9t031_i2c_driver = {
825 .driver = {
826 .name = "mt9t031",
827 },
828 .probe = mt9t031_probe,
829 .remove = mt9t031_remove,
830 .id_table = mt9t031_id,
831 };
832
833 static int __init mt9t031_mod_init(void)
834 {
835 return i2c_add_driver(&mt9t031_i2c_driver);
836 }
837
838 static void __exit mt9t031_mod_exit(void)
839 {
840 i2c_del_driver(&mt9t031_i2c_driver);
841 }
842
843 module_init(mt9t031_mod_init);
844 module_exit(mt9t031_mod_exit);
845
846 MODULE_DESCRIPTION("Micron MT9T031 Camera driver");
847 MODULE_AUTHOR("Guennadi Liakhovetski <lg@denx.de>");
848 MODULE_LICENSE("GPL v2");
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