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Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block
[mirror_ubuntu-kernels.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-common.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
22 * and call i2c_register_board_info() */
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 i2c_client *client;
72 struct soc_camera_device icd;
73 int model; /* V4L2_IDENT_MT9T031* codes from v4l2-chip-ident.h */
74 unsigned char autoexposure;
75 u16 xskip;
76 u16 yskip;
77 };
78
79 static int reg_read(struct soc_camera_device *icd, const u8 reg)
80 {
81 struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd);
82 struct i2c_client *client = mt9t031->client;
83 s32 data = i2c_smbus_read_word_data(client, reg);
84 return data < 0 ? data : swab16(data);
85 }
86
87 static int reg_write(struct soc_camera_device *icd, const u8 reg,
88 const u16 data)
89 {
90 struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd);
91 return i2c_smbus_write_word_data(mt9t031->client, reg, swab16(data));
92 }
93
94 static int reg_set(struct soc_camera_device *icd, const u8 reg,
95 const u16 data)
96 {
97 int ret;
98
99 ret = reg_read(icd, reg);
100 if (ret < 0)
101 return ret;
102 return reg_write(icd, reg, ret | data);
103 }
104
105 static int reg_clear(struct soc_camera_device *icd, const u8 reg,
106 const u16 data)
107 {
108 int ret;
109
110 ret = reg_read(icd, reg);
111 if (ret < 0)
112 return ret;
113 return reg_write(icd, reg, ret & ~data);
114 }
115
116 static int set_shutter(struct soc_camera_device *icd, const u32 data)
117 {
118 int ret;
119
120 ret = reg_write(icd, MT9T031_SHUTTER_WIDTH_UPPER, data >> 16);
121
122 if (ret >= 0)
123 ret = reg_write(icd, MT9T031_SHUTTER_WIDTH, data & 0xffff);
124
125 return ret;
126 }
127
128 static int get_shutter(struct soc_camera_device *icd, u32 *data)
129 {
130 int ret;
131
132 ret = reg_read(icd, MT9T031_SHUTTER_WIDTH_UPPER);
133 *data = ret << 16;
134
135 if (ret >= 0)
136 ret = reg_read(icd, MT9T031_SHUTTER_WIDTH);
137 *data |= ret & 0xffff;
138
139 return ret < 0 ? ret : 0;
140 }
141
142 static int mt9t031_init(struct soc_camera_device *icd)
143 {
144 struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd);
145 struct soc_camera_link *icl = mt9t031->client->dev.platform_data;
146 int ret;
147
148 if (icl->power) {
149 ret = icl->power(&mt9t031->client->dev, 1);
150 if (ret < 0) {
151 dev_err(icd->vdev->parent,
152 "Platform failed to power-on the camera.\n");
153 return ret;
154 }
155 }
156
157 /* Disable chip output, synchronous option update */
158 ret = reg_write(icd, MT9T031_RESET, 1);
159 if (ret >= 0)
160 ret = reg_write(icd, MT9T031_RESET, 0);
161 if (ret >= 0)
162 ret = reg_clear(icd, MT9T031_OUTPUT_CONTROL, 2);
163
164 if (ret < 0 && icl->power)
165 icl->power(&mt9t031->client->dev, 0);
166
167 return ret >= 0 ? 0 : -EIO;
168 }
169
170 static int mt9t031_release(struct soc_camera_device *icd)
171 {
172 struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd);
173 struct soc_camera_link *icl = mt9t031->client->dev.platform_data;
174
175 /* Disable the chip */
176 reg_clear(icd, MT9T031_OUTPUT_CONTROL, 2);
177
178 if (icl->power)
179 icl->power(&mt9t031->client->dev, 0);
180
181 return 0;
182 }
183
184 static int mt9t031_start_capture(struct soc_camera_device *icd)
185 {
186 /* Switch to master "normal" mode */
187 if (reg_set(icd, MT9T031_OUTPUT_CONTROL, 2) < 0)
188 return -EIO;
189 return 0;
190 }
191
192 static int mt9t031_stop_capture(struct soc_camera_device *icd)
193 {
194 /* Stop sensor readout */
195 if (reg_clear(icd, MT9T031_OUTPUT_CONTROL, 2) < 0)
196 return -EIO;
197 return 0;
198 }
199
200 static int mt9t031_set_bus_param(struct soc_camera_device *icd,
201 unsigned long flags)
202 {
203 /* The caller should have queried our parameters, check anyway */
204 if (flags & ~MT9T031_BUS_PARAM)
205 return -EINVAL;
206
207 if (flags & SOCAM_PCLK_SAMPLE_FALLING)
208 reg_clear(icd, MT9T031_PIXEL_CLOCK_CONTROL, 0x8000);
209 else
210 reg_set(icd, MT9T031_PIXEL_CLOCK_CONTROL, 0x8000);
211
212 return 0;
213 }
214
215 static unsigned long mt9t031_query_bus_param(struct soc_camera_device *icd)
216 {
217 struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd);
218 struct soc_camera_link *icl = mt9t031->client->dev.platform_data;
219
220 return soc_camera_apply_sensor_flags(icl, MT9T031_BUS_PARAM);
221 }
222
223 /* Round up minima and round down maxima */
224 static void recalculate_limits(struct soc_camera_device *icd,
225 u16 xskip, u16 yskip)
226 {
227 icd->x_min = (MT9T031_COLUMN_SKIP + xskip - 1) / xskip;
228 icd->y_min = (MT9T031_ROW_SKIP + yskip - 1) / yskip;
229 icd->width_min = (MT9T031_MIN_WIDTH + xskip - 1) / xskip;
230 icd->height_min = (MT9T031_MIN_HEIGHT + yskip - 1) / yskip;
231 icd->width_max = MT9T031_MAX_WIDTH / xskip;
232 icd->height_max = MT9T031_MAX_HEIGHT / yskip;
233 }
234
235 static int mt9t031_set_params(struct soc_camera_device *icd,
236 struct v4l2_rect *rect, u16 xskip, u16 yskip)
237 {
238 struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd);
239 int ret;
240 u16 xbin, ybin, width, height, left, top;
241 const u16 hblank = MT9T031_HORIZONTAL_BLANK,
242 vblank = MT9T031_VERTICAL_BLANK;
243
244 /* Make sure we don't exceed sensor limits */
245 if (rect->left + rect->width > icd->width_max)
246 rect->left = (icd->width_max - rect->width) / 2 + icd->x_min;
247
248 if (rect->top + rect->height > icd->height_max)
249 rect->top = (icd->height_max - rect->height) / 2 + icd->y_min;
250
251 width = rect->width * xskip;
252 height = rect->height * yskip;
253 left = rect->left * xskip;
254 top = rect->top * yskip;
255
256 xbin = min(xskip, (u16)3);
257 ybin = min(yskip, (u16)3);
258
259 dev_dbg(&icd->dev, "xskip %u, width %u/%u, yskip %u, height %u/%u\n",
260 xskip, width, rect->width, yskip, height, rect->height);
261
262 /* Could just do roundup(rect->left, [xy]bin * 2); but this is cheaper */
263 switch (xbin) {
264 case 2:
265 left = (left + 3) & ~3;
266 break;
267 case 3:
268 left = roundup(left, 6);
269 }
270
271 switch (ybin) {
272 case 2:
273 top = (top + 3) & ~3;
274 break;
275 case 3:
276 top = roundup(top, 6);
277 }
278
279 /* Disable register update, reconfigure atomically */
280 ret = reg_set(icd, MT9T031_OUTPUT_CONTROL, 1);
281 if (ret < 0)
282 return ret;
283
284 /* Blanking and start values - default... */
285 ret = reg_write(icd, MT9T031_HORIZONTAL_BLANKING, hblank);
286 if (ret >= 0)
287 ret = reg_write(icd, MT9T031_VERTICAL_BLANKING, vblank);
288
289 if (yskip != mt9t031->yskip || xskip != mt9t031->xskip) {
290 /* Binning, skipping */
291 if (ret >= 0)
292 ret = reg_write(icd, MT9T031_COLUMN_ADDRESS_MODE,
293 ((xbin - 1) << 4) | (xskip - 1));
294 if (ret >= 0)
295 ret = reg_write(icd, MT9T031_ROW_ADDRESS_MODE,
296 ((ybin - 1) << 4) | (yskip - 1));
297 }
298 dev_dbg(&icd->dev, "new physical left %u, top %u\n", left, top);
299
300 /* The caller provides a supported format, as guaranteed by
301 * icd->try_fmt_cap(), soc_camera_s_crop() and soc_camera_cropcap() */
302 if (ret >= 0)
303 ret = reg_write(icd, MT9T031_COLUMN_START, left);
304 if (ret >= 0)
305 ret = reg_write(icd, MT9T031_ROW_START, top);
306 if (ret >= 0)
307 ret = reg_write(icd, MT9T031_WINDOW_WIDTH, width - 1);
308 if (ret >= 0)
309 ret = reg_write(icd, MT9T031_WINDOW_HEIGHT,
310 height + icd->y_skip_top - 1);
311 if (ret >= 0 && mt9t031->autoexposure) {
312 ret = set_shutter(icd, height + icd->y_skip_top + vblank);
313 if (ret >= 0) {
314 const u32 shutter_max = MT9T031_MAX_HEIGHT + vblank;
315 const struct v4l2_queryctrl *qctrl =
316 soc_camera_find_qctrl(icd->ops,
317 V4L2_CID_EXPOSURE);
318 icd->exposure = (shutter_max / 2 + (height +
319 icd->y_skip_top + vblank - 1) *
320 (qctrl->maximum - qctrl->minimum)) /
321 shutter_max + qctrl->minimum;
322 }
323 }
324
325 /* Re-enable register update, commit all changes */
326 if (ret >= 0)
327 ret = reg_clear(icd, MT9T031_OUTPUT_CONTROL, 1);
328
329 return ret < 0 ? ret : 0;
330 }
331
332 static int mt9t031_set_crop(struct soc_camera_device *icd,
333 struct v4l2_rect *rect)
334 {
335 struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd);
336
337 /* CROP - no change in scaling, or in limits */
338 return mt9t031_set_params(icd, rect, mt9t031->xskip, mt9t031->yskip);
339 }
340
341 static int mt9t031_set_fmt(struct soc_camera_device *icd,
342 struct v4l2_format *f)
343 {
344 struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd);
345 int ret;
346 u16 xskip, yskip;
347 struct v4l2_rect rect = {
348 .left = icd->x_current,
349 .top = icd->y_current,
350 .width = f->fmt.pix.width,
351 .height = f->fmt.pix.height,
352 };
353
354 /*
355 * try_fmt has put rectangle within limits.
356 * S_FMT - use binning and skipping for scaling, recalculate
357 * limits, used for cropping
358 */
359 /* Is this more optimal than just a division? */
360 for (xskip = 8; xskip > 1; xskip--)
361 if (rect.width * xskip <= MT9T031_MAX_WIDTH)
362 break;
363
364 for (yskip = 8; yskip > 1; yskip--)
365 if (rect.height * yskip <= MT9T031_MAX_HEIGHT)
366 break;
367
368 recalculate_limits(icd, xskip, yskip);
369
370 ret = mt9t031_set_params(icd, &rect, xskip, yskip);
371 if (!ret) {
372 mt9t031->xskip = xskip;
373 mt9t031->yskip = yskip;
374 }
375
376 return ret;
377 }
378
379 static int mt9t031_try_fmt(struct soc_camera_device *icd,
380 struct v4l2_format *f)
381 {
382 struct v4l2_pix_format *pix = &f->fmt.pix;
383
384 if (pix->height < MT9T031_MIN_HEIGHT)
385 pix->height = MT9T031_MIN_HEIGHT;
386 if (pix->height > MT9T031_MAX_HEIGHT)
387 pix->height = MT9T031_MAX_HEIGHT;
388 if (pix->width < MT9T031_MIN_WIDTH)
389 pix->width = MT9T031_MIN_WIDTH;
390 if (pix->width > MT9T031_MAX_WIDTH)
391 pix->width = MT9T031_MAX_WIDTH;
392
393 pix->width &= ~0x01; /* has to be even */
394 pix->height &= ~0x01; /* has to be even */
395
396 return 0;
397 }
398
399 static int mt9t031_get_chip_id(struct soc_camera_device *icd,
400 struct v4l2_dbg_chip_ident *id)
401 {
402 struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd);
403
404 if (id->match.type != V4L2_CHIP_MATCH_I2C_ADDR)
405 return -EINVAL;
406
407 if (id->match.addr != mt9t031->client->addr)
408 return -ENODEV;
409
410 id->ident = mt9t031->model;
411 id->revision = 0;
412
413 return 0;
414 }
415
416 #ifdef CONFIG_VIDEO_ADV_DEBUG
417 static int mt9t031_get_register(struct soc_camera_device *icd,
418 struct v4l2_dbg_register *reg)
419 {
420 struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd);
421
422 if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
423 return -EINVAL;
424
425 if (reg->match.addr != mt9t031->client->addr)
426 return -ENODEV;
427
428 reg->val = reg_read(icd, reg->reg);
429
430 if (reg->val > 0xffff)
431 return -EIO;
432
433 return 0;
434 }
435
436 static int mt9t031_set_register(struct soc_camera_device *icd,
437 struct v4l2_dbg_register *reg)
438 {
439 struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd);
440
441 if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
442 return -EINVAL;
443
444 if (reg->match.addr != mt9t031->client->addr)
445 return -ENODEV;
446
447 if (reg_write(icd, reg->reg, reg->val) < 0)
448 return -EIO;
449
450 return 0;
451 }
452 #endif
453
454 static const struct v4l2_queryctrl mt9t031_controls[] = {
455 {
456 .id = V4L2_CID_VFLIP,
457 .type = V4L2_CTRL_TYPE_BOOLEAN,
458 .name = "Flip Vertically",
459 .minimum = 0,
460 .maximum = 1,
461 .step = 1,
462 .default_value = 0,
463 }, {
464 .id = V4L2_CID_HFLIP,
465 .type = V4L2_CTRL_TYPE_BOOLEAN,
466 .name = "Flip Horizontally",
467 .minimum = 0,
468 .maximum = 1,
469 .step = 1,
470 .default_value = 0,
471 }, {
472 .id = V4L2_CID_GAIN,
473 .type = V4L2_CTRL_TYPE_INTEGER,
474 .name = "Gain",
475 .minimum = 0,
476 .maximum = 127,
477 .step = 1,
478 .default_value = 64,
479 .flags = V4L2_CTRL_FLAG_SLIDER,
480 }, {
481 .id = V4L2_CID_EXPOSURE,
482 .type = V4L2_CTRL_TYPE_INTEGER,
483 .name = "Exposure",
484 .minimum = 1,
485 .maximum = 255,
486 .step = 1,
487 .default_value = 255,
488 .flags = V4L2_CTRL_FLAG_SLIDER,
489 }, {
490 .id = V4L2_CID_EXPOSURE_AUTO,
491 .type = V4L2_CTRL_TYPE_BOOLEAN,
492 .name = "Automatic Exposure",
493 .minimum = 0,
494 .maximum = 1,
495 .step = 1,
496 .default_value = 1,
497 }
498 };
499
500 static int mt9t031_video_probe(struct soc_camera_device *);
501 static void mt9t031_video_remove(struct soc_camera_device *);
502 static int mt9t031_get_control(struct soc_camera_device *, struct v4l2_control *);
503 static int mt9t031_set_control(struct soc_camera_device *, struct v4l2_control *);
504
505 static struct soc_camera_ops mt9t031_ops = {
506 .owner = THIS_MODULE,
507 .probe = mt9t031_video_probe,
508 .remove = mt9t031_video_remove,
509 .init = mt9t031_init,
510 .release = mt9t031_release,
511 .start_capture = mt9t031_start_capture,
512 .stop_capture = mt9t031_stop_capture,
513 .set_crop = mt9t031_set_crop,
514 .set_fmt = mt9t031_set_fmt,
515 .try_fmt = mt9t031_try_fmt,
516 .set_bus_param = mt9t031_set_bus_param,
517 .query_bus_param = mt9t031_query_bus_param,
518 .controls = mt9t031_controls,
519 .num_controls = ARRAY_SIZE(mt9t031_controls),
520 .get_control = mt9t031_get_control,
521 .set_control = mt9t031_set_control,
522 .get_chip_id = mt9t031_get_chip_id,
523 #ifdef CONFIG_VIDEO_ADV_DEBUG
524 .get_register = mt9t031_get_register,
525 .set_register = mt9t031_set_register,
526 #endif
527 };
528
529 static int mt9t031_get_control(struct soc_camera_device *icd, struct v4l2_control *ctrl)
530 {
531 struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd);
532 int data;
533
534 switch (ctrl->id) {
535 case V4L2_CID_VFLIP:
536 data = reg_read(icd, MT9T031_READ_MODE_2);
537 if (data < 0)
538 return -EIO;
539 ctrl->value = !!(data & 0x8000);
540 break;
541 case V4L2_CID_HFLIP:
542 data = reg_read(icd, MT9T031_READ_MODE_2);
543 if (data < 0)
544 return -EIO;
545 ctrl->value = !!(data & 0x4000);
546 break;
547 case V4L2_CID_EXPOSURE_AUTO:
548 ctrl->value = mt9t031->autoexposure;
549 break;
550 }
551 return 0;
552 }
553
554 static int mt9t031_set_control(struct soc_camera_device *icd, struct v4l2_control *ctrl)
555 {
556 struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd);
557 const struct v4l2_queryctrl *qctrl;
558 int data;
559
560 qctrl = soc_camera_find_qctrl(&mt9t031_ops, ctrl->id);
561
562 if (!qctrl)
563 return -EINVAL;
564
565 switch (ctrl->id) {
566 case V4L2_CID_VFLIP:
567 if (ctrl->value)
568 data = reg_set(icd, MT9T031_READ_MODE_2, 0x8000);
569 else
570 data = reg_clear(icd, MT9T031_READ_MODE_2, 0x8000);
571 if (data < 0)
572 return -EIO;
573 break;
574 case V4L2_CID_HFLIP:
575 if (ctrl->value)
576 data = reg_set(icd, MT9T031_READ_MODE_2, 0x4000);
577 else
578 data = reg_clear(icd, MT9T031_READ_MODE_2, 0x4000);
579 if (data < 0)
580 return -EIO;
581 break;
582 case V4L2_CID_GAIN:
583 if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum)
584 return -EINVAL;
585 /* See Datasheet Table 7, Gain settings. */
586 if (ctrl->value <= qctrl->default_value) {
587 /* Pack it into 0..1 step 0.125, register values 0..8 */
588 unsigned long range = qctrl->default_value - qctrl->minimum;
589 data = ((ctrl->value - qctrl->minimum) * 8 + range / 2) / range;
590
591 dev_dbg(&icd->dev, "Setting gain %d\n", data);
592 data = reg_write(icd, MT9T031_GLOBAL_GAIN, data);
593 if (data < 0)
594 return -EIO;
595 } else {
596 /* Pack it into 1.125..128 variable step, register values 9..0x7860 */
597 /* We assume qctrl->maximum - qctrl->default_value - 1 > 0 */
598 unsigned long range = qctrl->maximum - qctrl->default_value - 1;
599 /* calculated gain: map 65..127 to 9..1024 step 0.125 */
600 unsigned long gain = ((ctrl->value - qctrl->default_value - 1) *
601 1015 + range / 2) / range + 9;
602
603 if (gain <= 32) /* calculated gain 9..32 -> 9..32 */
604 data = gain;
605 else if (gain <= 64) /* calculated gain 33..64 -> 0x51..0x60 */
606 data = ((gain - 32) * 16 + 16) / 32 + 80;
607 else
608 /* calculated gain 65..1024 -> (1..120) << 8 + 0x60 */
609 data = (((gain - 64 + 7) * 32) & 0xff00) | 0x60;
610
611 dev_dbg(&icd->dev, "Setting gain from 0x%x to 0x%x\n",
612 reg_read(icd, MT9T031_GLOBAL_GAIN), data);
613 data = reg_write(icd, MT9T031_GLOBAL_GAIN, data);
614 if (data < 0)
615 return -EIO;
616 }
617
618 /* Success */
619 icd->gain = ctrl->value;
620 break;
621 case V4L2_CID_EXPOSURE:
622 /* mt9t031 has maximum == default */
623 if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum)
624 return -EINVAL;
625 else {
626 const unsigned long range = qctrl->maximum - qctrl->minimum;
627 const u32 shutter = ((ctrl->value - qctrl->minimum) * 1048 +
628 range / 2) / range + 1;
629 u32 old;
630
631 get_shutter(icd, &old);
632 dev_dbg(&icd->dev, "Setting shutter width from %u to %u\n",
633 old, shutter);
634 if (set_shutter(icd, shutter) < 0)
635 return -EIO;
636 icd->exposure = ctrl->value;
637 mt9t031->autoexposure = 0;
638 }
639 break;
640 case V4L2_CID_EXPOSURE_AUTO:
641 if (ctrl->value) {
642 const u16 vblank = MT9T031_VERTICAL_BLANK;
643 const u32 shutter_max = MT9T031_MAX_HEIGHT + vblank;
644 if (set_shutter(icd, icd->height +
645 icd->y_skip_top + vblank) < 0)
646 return -EIO;
647 qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_EXPOSURE);
648 icd->exposure = (shutter_max / 2 + (icd->height +
649 icd->y_skip_top + vblank - 1) *
650 (qctrl->maximum - qctrl->minimum)) /
651 shutter_max + qctrl->minimum;
652 mt9t031->autoexposure = 1;
653 } else
654 mt9t031->autoexposure = 0;
655 break;
656 }
657 return 0;
658 }
659
660 /* Interface active, can use i2c. If it fails, it can indeed mean, that
661 * this wasn't our capture interface, so, we wait for the right one */
662 static int mt9t031_video_probe(struct soc_camera_device *icd)
663 {
664 struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd);
665 s32 data;
666 int ret;
667
668 /* We must have a parent by now. And it cannot be a wrong one.
669 * So this entire test is completely redundant. */
670 if (!icd->dev.parent ||
671 to_soc_camera_host(icd->dev.parent)->nr != icd->iface)
672 return -ENODEV;
673
674 /* Enable the chip */
675 data = reg_write(icd, MT9T031_CHIP_ENABLE, 1);
676 dev_dbg(&icd->dev, "write: %d\n", data);
677
678 /* Read out the chip version register */
679 data = reg_read(icd, MT9T031_CHIP_VERSION);
680
681 switch (data) {
682 case 0x1621:
683 mt9t031->model = V4L2_IDENT_MT9T031;
684 icd->formats = mt9t031_colour_formats;
685 icd->num_formats = ARRAY_SIZE(mt9t031_colour_formats);
686 break;
687 default:
688 ret = -ENODEV;
689 dev_err(&icd->dev,
690 "No MT9T031 chip detected, register read %x\n", data);
691 goto ei2c;
692 }
693
694 dev_info(&icd->dev, "Detected a MT9T031 chip ID %x\n", data);
695
696 /* Now that we know the model, we can start video */
697 ret = soc_camera_video_start(icd);
698 if (ret)
699 goto evstart;
700
701 return 0;
702
703 evstart:
704 ei2c:
705 return ret;
706 }
707
708 static void mt9t031_video_remove(struct soc_camera_device *icd)
709 {
710 struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd);
711
712 dev_dbg(&icd->dev, "Video %x removed: %p, %p\n", mt9t031->client->addr,
713 icd->dev.parent, icd->vdev);
714 soc_camera_video_stop(icd);
715 }
716
717 static int mt9t031_probe(struct i2c_client *client,
718 const struct i2c_device_id *did)
719 {
720 struct mt9t031 *mt9t031;
721 struct soc_camera_device *icd;
722 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
723 struct soc_camera_link *icl = client->dev.platform_data;
724 int ret;
725
726 if (!icl) {
727 dev_err(&client->dev, "MT9T031 driver needs platform data\n");
728 return -EINVAL;
729 }
730
731 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
732 dev_warn(&adapter->dev,
733 "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
734 return -EIO;
735 }
736
737 mt9t031 = kzalloc(sizeof(struct mt9t031), GFP_KERNEL);
738 if (!mt9t031)
739 return -ENOMEM;
740
741 mt9t031->client = client;
742 i2c_set_clientdata(client, mt9t031);
743
744 /* Second stage probe - when a capture adapter is there */
745 icd = &mt9t031->icd;
746 icd->ops = &mt9t031_ops;
747 icd->control = &client->dev;
748 icd->x_min = MT9T031_COLUMN_SKIP;
749 icd->y_min = MT9T031_ROW_SKIP;
750 icd->x_current = icd->x_min;
751 icd->y_current = icd->y_min;
752 icd->width_min = MT9T031_MIN_WIDTH;
753 icd->width_max = MT9T031_MAX_WIDTH;
754 icd->height_min = MT9T031_MIN_HEIGHT;
755 icd->height_max = MT9T031_MAX_HEIGHT;
756 icd->y_skip_top = 0;
757 icd->iface = icl->bus_id;
758 /* Simulated autoexposure. If enabled, we calculate shutter width
759 * ourselves in the driver based on vertical blanking and frame width */
760 mt9t031->autoexposure = 1;
761
762 mt9t031->xskip = 1;
763 mt9t031->yskip = 1;
764
765 ret = soc_camera_device_register(icd);
766 if (ret)
767 goto eisdr;
768
769 return 0;
770
771 eisdr:
772 i2c_set_clientdata(client, NULL);
773 kfree(mt9t031);
774 return ret;
775 }
776
777 static int mt9t031_remove(struct i2c_client *client)
778 {
779 struct mt9t031 *mt9t031 = i2c_get_clientdata(client);
780
781 soc_camera_device_unregister(&mt9t031->icd);
782 i2c_set_clientdata(client, NULL);
783 kfree(mt9t031);
784
785 return 0;
786 }
787
788 static const struct i2c_device_id mt9t031_id[] = {
789 { "mt9t031", 0 },
790 { }
791 };
792 MODULE_DEVICE_TABLE(i2c, mt9t031_id);
793
794 static struct i2c_driver mt9t031_i2c_driver = {
795 .driver = {
796 .name = "mt9t031",
797 },
798 .probe = mt9t031_probe,
799 .remove = mt9t031_remove,
800 .id_table = mt9t031_id,
801 };
802
803 static int __init mt9t031_mod_init(void)
804 {
805 return i2c_add_driver(&mt9t031_i2c_driver);
806 }
807
808 static void __exit mt9t031_mod_exit(void)
809 {
810 i2c_del_driver(&mt9t031_i2c_driver);
811 }
812
813 module_init(mt9t031_mod_init);
814 module_exit(mt9t031_mod_exit);
815
816 MODULE_DESCRIPTION("Micron MT9T031 Camera driver");
817 MODULE_AUTHOR("Guennadi Liakhovetski <lg@denx.de>");
818 MODULE_LICENSE("GPL v2");
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