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powerpc: use consistent types in mktree
[zen-stable.git] / drivers / media / video / mt9t031.c
blob4207fb342670d47284e8d5f78db28f83744572ab
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 i2c_client *client, const u8 reg)
80 {
81 s32 data = i2c_smbus_read_word_data(client, reg);
82 return data < 0 ? data : swab16(data);
83 }
84
85 static int reg_write(struct i2c_client *client, const u8 reg,
86 const u16 data)
87 {
88 return i2c_smbus_write_word_data(client, reg, swab16(data));
89 }
90
91 static int reg_set(struct i2c_client *client, const u8 reg,
92 const u16 data)
93 {
94 int ret;
95
96 ret = reg_read(client, reg);
97 if (ret < 0)
98 return ret;
99 return reg_write(client, reg, ret | data);
100 }
101
102 static int reg_clear(struct i2c_client *client, const u8 reg,
103 const u16 data)
104 {
105 int ret;
106
107 ret = reg_read(client, reg);
108 if (ret < 0)
109 return ret;
110 return reg_write(client, reg, ret & ~data);
111 }
112
113 static int set_shutter(struct i2c_client *client, const u32 data)
114 {
115 int ret;
116
117 ret = reg_write(client, MT9T031_SHUTTER_WIDTH_UPPER, data >> 16);
118
119 if (ret >= 0)
120 ret = reg_write(client, MT9T031_SHUTTER_WIDTH, data & 0xffff);
121
122 return ret;
123 }
124
125 static int get_shutter(struct i2c_client *client, u32 *data)
126 {
127 int ret;
128
129 ret = reg_read(client, MT9T031_SHUTTER_WIDTH_UPPER);
130 *data = ret << 16;
131
132 if (ret >= 0)
133 ret = reg_read(client, MT9T031_SHUTTER_WIDTH);
134 *data |= ret & 0xffff;
135
136 return ret < 0 ? ret : 0;
137 }
138
139 static int mt9t031_init(struct soc_camera_device *icd)
140 {
141 struct i2c_client *client = to_i2c_client(icd->control);
142 struct soc_camera_link *icl = client->dev.platform_data;
143 int ret;
144
145 if (icl->power) {
146 ret = icl->power(&client->dev, 1);
147 if (ret < 0) {
148 dev_err(icd->vdev->parent,
149 "Platform failed to power-on the camera.\n");
150 return ret;
151 }
152 }
153
154 /* Disable chip output, synchronous option update */
155 ret = reg_write(client, MT9T031_RESET, 1);
156 if (ret >= 0)
157 ret = reg_write(client, MT9T031_RESET, 0);
158 if (ret >= 0)
159 ret = reg_clear(client, MT9T031_OUTPUT_CONTROL, 2);
160
161 if (ret < 0 && icl->power)
162 icl->power(&client->dev, 0);
163
164 return ret >= 0 ? 0 : -EIO;
165 }
166
167 static int mt9t031_release(struct soc_camera_device *icd)
168 {
169 struct i2c_client *client = to_i2c_client(icd->control);
170 struct soc_camera_link *icl = client->dev.platform_data;
171
172 /* Disable the chip */
173 reg_clear(client, MT9T031_OUTPUT_CONTROL, 2);
174
175 if (icl->power)
176 icl->power(&client->dev, 0);
177
178 return 0;
179 }
180
181 static int mt9t031_start_capture(struct soc_camera_device *icd)
182 {
183 struct i2c_client *client = to_i2c_client(icd->control);
184
185 /* Switch to master "normal" mode */
186 if (reg_set(client, MT9T031_OUTPUT_CONTROL, 2) < 0)
187 return -EIO;
188 return 0;
189 }
190
191 static int mt9t031_stop_capture(struct soc_camera_device *icd)
192 {
193 struct i2c_client *client = to_i2c_client(icd->control);
194
195 /* Stop sensor readout */
196 if (reg_clear(client, MT9T031_OUTPUT_CONTROL, 2) < 0)
197 return -EIO;
198 return 0;
199 }
200
201 static int mt9t031_set_bus_param(struct soc_camera_device *icd,
202 unsigned long flags)
203 {
204 struct i2c_client *client = to_i2c_client(icd->control);
205
206 /* The caller should have queried our parameters, check anyway */
207 if (flags & ~MT9T031_BUS_PARAM)
208 return -EINVAL;
209
210 if (flags & SOCAM_PCLK_SAMPLE_FALLING)
211 reg_clear(client, MT9T031_PIXEL_CLOCK_CONTROL, 0x8000);
212 else
213 reg_set(client, MT9T031_PIXEL_CLOCK_CONTROL, 0x8000);
214
215 return 0;
216 }
217
218 static unsigned long mt9t031_query_bus_param(struct soc_camera_device *icd)
219 {
220 struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd);
221 struct soc_camera_link *icl = mt9t031->client->dev.platform_data;
222
223 return soc_camera_apply_sensor_flags(icl, MT9T031_BUS_PARAM);
224 }
225
226 /* Round up minima and round down maxima */
227 static void recalculate_limits(struct soc_camera_device *icd,
228 u16 xskip, u16 yskip)
229 {
230 icd->x_min = (MT9T031_COLUMN_SKIP + xskip - 1) / xskip;
231 icd->y_min = (MT9T031_ROW_SKIP + yskip - 1) / yskip;
232 icd->width_min = (MT9T031_MIN_WIDTH + xskip - 1) / xskip;
233 icd->height_min = (MT9T031_MIN_HEIGHT + yskip - 1) / yskip;
234 icd->width_max = MT9T031_MAX_WIDTH / xskip;
235 icd->height_max = MT9T031_MAX_HEIGHT / yskip;
236 }
237
238 static int mt9t031_set_params(struct soc_camera_device *icd,
239 struct v4l2_rect *rect, u16 xskip, u16 yskip)
240 {
241 struct i2c_client *client = to_i2c_client(icd->control);
242 struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd);
243 int ret;
244 u16 xbin, ybin, width, height, left, top;
245 const u16 hblank = MT9T031_HORIZONTAL_BLANK,
246 vblank = MT9T031_VERTICAL_BLANK;
247
248 /* Make sure we don't exceed sensor limits */
249 if (rect->left + rect->width > icd->width_max)
250 rect->left = (icd->width_max - rect->width) / 2 + icd->x_min;
251
252 if (rect->top + rect->height > icd->height_max)
253 rect->top = (icd->height_max - rect->height) / 2 + icd->y_min;
254
255 width = rect->width * xskip;
256 height = rect->height * yskip;
257 left = rect->left * xskip;
258 top = rect->top * yskip;
259
260 xbin = min(xskip, (u16)3);
261 ybin = min(yskip, (u16)3);
262
263 dev_dbg(&icd->dev, "xskip %u, width %u/%u, yskip %u, height %u/%u\n",
264 xskip, width, rect->width, yskip, height, rect->height);
265
266 /* Could just do roundup(rect->left, [xy]bin * 2); but this is cheaper */
267 switch (xbin) {
268 case 2:
269 left = (left + 3) & ~3;
270 break;
271 case 3:
272 left = roundup(left, 6);
273 }
274
275 switch (ybin) {
276 case 2:
277 top = (top + 3) & ~3;
278 break;
279 case 3:
280 top = roundup(top, 6);
281 }
282
283 /* Disable register update, reconfigure atomically */
284 ret = reg_set(client, MT9T031_OUTPUT_CONTROL, 1);
285 if (ret < 0)
286 return ret;
287
288 /* Blanking and start values - default... */
289 ret = reg_write(client, MT9T031_HORIZONTAL_BLANKING, hblank);
290 if (ret >= 0)
291 ret = reg_write(client, MT9T031_VERTICAL_BLANKING, vblank);
292
293 if (yskip != mt9t031->yskip || xskip != mt9t031->xskip) {
294 /* Binning, skipping */
295 if (ret >= 0)
296 ret = reg_write(client, MT9T031_COLUMN_ADDRESS_MODE,
297 ((xbin - 1) << 4) | (xskip - 1));
298 if (ret >= 0)
299 ret = reg_write(client, MT9T031_ROW_ADDRESS_MODE,
300 ((ybin - 1) << 4) | (yskip - 1));
301 }
302 dev_dbg(&icd->dev, "new physical left %u, top %u\n", left, top);
303
304 /* The caller provides a supported format, as guaranteed by
305 * icd->try_fmt_cap(), soc_camera_s_crop() and soc_camera_cropcap() */
306 if (ret >= 0)
307 ret = reg_write(client, MT9T031_COLUMN_START, left);
308 if (ret >= 0)
309 ret = reg_write(client, MT9T031_ROW_START, top);
310 if (ret >= 0)
311 ret = reg_write(client, MT9T031_WINDOW_WIDTH, width - 1);
312 if (ret >= 0)
313 ret = reg_write(client, MT9T031_WINDOW_HEIGHT,
314 height + icd->y_skip_top - 1);
315 if (ret >= 0 && mt9t031->autoexposure) {
316 ret = set_shutter(client, height + icd->y_skip_top + vblank);
317 if (ret >= 0) {
318 const u32 shutter_max = MT9T031_MAX_HEIGHT + vblank;
319 const struct v4l2_queryctrl *qctrl =
320 soc_camera_find_qctrl(icd->ops,
321 V4L2_CID_EXPOSURE);
322 icd->exposure = (shutter_max / 2 + (height +
323 icd->y_skip_top + vblank - 1) *
324 (qctrl->maximum - qctrl->minimum)) /
325 shutter_max + qctrl->minimum;
326 }
327 }
328
329 /* Re-enable register update, commit all changes */
330 if (ret >= 0)
331 ret = reg_clear(client, MT9T031_OUTPUT_CONTROL, 1);
332
333 return ret < 0 ? ret : 0;
334 }
335
336 static int mt9t031_set_crop(struct soc_camera_device *icd,
337 struct v4l2_rect *rect)
338 {
339 struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd);
340
341 /* CROP - no change in scaling, or in limits */
342 return mt9t031_set_params(icd, rect, mt9t031->xskip, mt9t031->yskip);
343 }
344
345 static int mt9t031_set_fmt(struct soc_camera_device *icd,
346 struct v4l2_format *f)
347 {
348 struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd);
349 int ret;
350 u16 xskip, yskip;
351 struct v4l2_rect rect = {
352 .left = icd->x_current,
353 .top = icd->y_current,
354 .width = f->fmt.pix.width,
355 .height = f->fmt.pix.height,
356 };
357
358 /*
359 * try_fmt has put rectangle within limits.
360 * S_FMT - use binning and skipping for scaling, recalculate
361 * limits, used for cropping
362 */
363 /* Is this more optimal than just a division? */
364 for (xskip = 8; xskip > 1; xskip--)
365 if (rect.width * xskip <= MT9T031_MAX_WIDTH)
366 break;
367
368 for (yskip = 8; yskip > 1; yskip--)
369 if (rect.height * yskip <= MT9T031_MAX_HEIGHT)
370 break;
371
372 recalculate_limits(icd, xskip, yskip);
373
374 ret = mt9t031_set_params(icd, &rect, xskip, yskip);
375 if (!ret) {
376 mt9t031->xskip = xskip;
377 mt9t031->yskip = yskip;
378 }
379
380 return ret;
381 }
382
383 static int mt9t031_try_fmt(struct soc_camera_device *icd,
384 struct v4l2_format *f)
385 {
386 struct v4l2_pix_format *pix = &f->fmt.pix;
387
388 v4l_bound_align_image(
389 &pix->width, MT9T031_MIN_WIDTH, MT9T031_MAX_WIDTH, 1,
390 &pix->height, MT9T031_MIN_HEIGHT, MT9T031_MAX_HEIGHT, 1, 0);
391
392 return 0;
393 }
394
395 static int mt9t031_get_chip_id(struct soc_camera_device *icd,
396 struct v4l2_dbg_chip_ident *id)
397 {
398 struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd);
399
400 if (id->match.type != V4L2_CHIP_MATCH_I2C_ADDR)
401 return -EINVAL;
402
403 if (id->match.addr != mt9t031->client->addr)
404 return -ENODEV;
405
406 id->ident = mt9t031->model;
407 id->revision = 0;
408
409 return 0;
410 }
411
412 #ifdef CONFIG_VIDEO_ADV_DEBUG
413 static int mt9t031_get_register(struct soc_camera_device *icd,
414 struct v4l2_dbg_register *reg)
415 {
416 struct i2c_client *client = to_i2c_client(icd->control);
417
418 if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
419 return -EINVAL;
420
421 if (reg->match.addr != client->addr)
422 return -ENODEV;
423
424 reg->val = reg_read(client, reg->reg);
425
426 if (reg->val > 0xffff)
427 return -EIO;
428
429 return 0;
430 }
431
432 static int mt9t031_set_register(struct soc_camera_device *icd,
433 struct v4l2_dbg_register *reg)
434 {
435 struct i2c_client *client = to_i2c_client(icd->control);
436
437 if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
438 return -EINVAL;
439
440 if (reg->match.addr != client->addr)
441 return -ENODEV;
442
443 if (reg_write(client, reg->reg, reg->val) < 0)
444 return -EIO;
445
446 return 0;
447 }
448 #endif
449
450 static const struct v4l2_queryctrl mt9t031_controls[] = {
451 {
452 .id = V4L2_CID_VFLIP,
453 .type = V4L2_CTRL_TYPE_BOOLEAN,
454 .name = "Flip Vertically",
455 .minimum = 0,
456 .maximum = 1,
457 .step = 1,
458 .default_value = 0,
459 }, {
460 .id = V4L2_CID_HFLIP,
461 .type = V4L2_CTRL_TYPE_BOOLEAN,
462 .name = "Flip Horizontally",
463 .minimum = 0,
464 .maximum = 1,
465 .step = 1,
466 .default_value = 0,
467 }, {
468 .id = V4L2_CID_GAIN,
469 .type = V4L2_CTRL_TYPE_INTEGER,
470 .name = "Gain",
471 .minimum = 0,
472 .maximum = 127,
473 .step = 1,
474 .default_value = 64,
475 .flags = V4L2_CTRL_FLAG_SLIDER,
476 }, {
477 .id = V4L2_CID_EXPOSURE,
478 .type = V4L2_CTRL_TYPE_INTEGER,
479 .name = "Exposure",
480 .minimum = 1,
481 .maximum = 255,
482 .step = 1,
483 .default_value = 255,
484 .flags = V4L2_CTRL_FLAG_SLIDER,
485 }, {
486 .id = V4L2_CID_EXPOSURE_AUTO,
487 .type = V4L2_CTRL_TYPE_BOOLEAN,
488 .name = "Automatic Exposure",
489 .minimum = 0,
490 .maximum = 1,
491 .step = 1,
492 .default_value = 1,
493 }
494 };
495
496 static int mt9t031_video_probe(struct soc_camera_device *);
497 static void mt9t031_video_remove(struct soc_camera_device *);
498 static int mt9t031_get_control(struct soc_camera_device *, struct v4l2_control *);
499 static int mt9t031_set_control(struct soc_camera_device *, struct v4l2_control *);
500
501 static struct soc_camera_ops mt9t031_ops = {
502 .owner = THIS_MODULE,
503 .probe = mt9t031_video_probe,
504 .remove = mt9t031_video_remove,
505 .init = mt9t031_init,
506 .release = mt9t031_release,
507 .start_capture = mt9t031_start_capture,
508 .stop_capture = mt9t031_stop_capture,
509 .set_crop = mt9t031_set_crop,
510 .set_fmt = mt9t031_set_fmt,
511 .try_fmt = mt9t031_try_fmt,
512 .set_bus_param = mt9t031_set_bus_param,
513 .query_bus_param = mt9t031_query_bus_param,
514 .controls = mt9t031_controls,
515 .num_controls = ARRAY_SIZE(mt9t031_controls),
516 .get_control = mt9t031_get_control,
517 .set_control = mt9t031_set_control,
518 .get_chip_id = mt9t031_get_chip_id,
519 #ifdef CONFIG_VIDEO_ADV_DEBUG
520 .get_register = mt9t031_get_register,
521 .set_register = mt9t031_set_register,
522 #endif
523 };
524
525 static int mt9t031_get_control(struct soc_camera_device *icd, struct v4l2_control *ctrl)
526 {
527 struct i2c_client *client = to_i2c_client(icd->control);
528 struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd);
529 int data;
530
531 switch (ctrl->id) {
532 case V4L2_CID_VFLIP:
533 data = reg_read(client, MT9T031_READ_MODE_2);
534 if (data < 0)
535 return -EIO;
536 ctrl->value = !!(data & 0x8000);
537 break;
538 case V4L2_CID_HFLIP:
539 data = reg_read(client, MT9T031_READ_MODE_2);
540 if (data < 0)
541 return -EIO;
542 ctrl->value = !!(data & 0x4000);
543 break;
544 case V4L2_CID_EXPOSURE_AUTO:
545 ctrl->value = mt9t031->autoexposure;
546 break;
547 }
548 return 0;
549 }
550
551 static int mt9t031_set_control(struct soc_camera_device *icd, struct v4l2_control *ctrl)
552 {
553 struct i2c_client *client = to_i2c_client(icd->control);
554 struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd);
555 const struct v4l2_queryctrl *qctrl;
556 int data;
557
558 qctrl = soc_camera_find_qctrl(&mt9t031_ops, ctrl->id);
559
560 if (!qctrl)
561 return -EINVAL;
562
563 switch (ctrl->id) {
564 case V4L2_CID_VFLIP:
565 if (ctrl->value)
566 data = reg_set(client, MT9T031_READ_MODE_2, 0x8000);
567 else
568 data = reg_clear(client, MT9T031_READ_MODE_2, 0x8000);
569 if (data < 0)
570 return -EIO;
571 break;
572 case V4L2_CID_HFLIP:
573 if (ctrl->value)
574 data = reg_set(client, MT9T031_READ_MODE_2, 0x4000);
575 else
576 data = reg_clear(client, MT9T031_READ_MODE_2, 0x4000);
577 if (data < 0)
578 return -EIO;
579 break;
580 case V4L2_CID_GAIN:
581 if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum)
582 return -EINVAL;
583 /* See Datasheet Table 7, Gain settings. */
584 if (ctrl->value <= qctrl->default_value) {
585 /* Pack it into 0..1 step 0.125, register values 0..8 */
586 unsigned long range = qctrl->default_value - qctrl->minimum;
587 data = ((ctrl->value - qctrl->minimum) * 8 + range / 2) / range;
588
589 dev_dbg(&icd->dev, "Setting gain %d\n", data);
590 data = reg_write(client, MT9T031_GLOBAL_GAIN, data);
591 if (data < 0)
592 return -EIO;
593 } else {
594 /* Pack it into 1.125..128 variable step, register values 9..0x7860 */
595 /* We assume qctrl->maximum - qctrl->default_value - 1 > 0 */
596 unsigned long range = qctrl->maximum - qctrl->default_value - 1;
597 /* calculated gain: map 65..127 to 9..1024 step 0.125 */
598 unsigned long gain = ((ctrl->value - qctrl->default_value - 1) *
599 1015 + range / 2) / range + 9;
600
601 if (gain <= 32) /* calculated gain 9..32 -> 9..32 */
602 data = gain;
603 else if (gain <= 64) /* calculated gain 33..64 -> 0x51..0x60 */
604 data = ((gain - 32) * 16 + 16) / 32 + 80;
605 else
606 /* calculated gain 65..1024 -> (1..120) << 8 + 0x60 */
607 data = (((gain - 64 + 7) * 32) & 0xff00) | 0x60;
608
609 dev_dbg(&icd->dev, "Setting gain from 0x%x to 0x%x\n",
610 reg_read(client, MT9T031_GLOBAL_GAIN), data);
611 data = reg_write(client, MT9T031_GLOBAL_GAIN, data);
612 if (data < 0)
613 return -EIO;
614 }
615
616 /* Success */
617 icd->gain = ctrl->value;
618 break;
619 case V4L2_CID_EXPOSURE:
620 /* mt9t031 has maximum == default */
621 if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum)
622 return -EINVAL;
623 else {
624 const unsigned long range = qctrl->maximum - qctrl->minimum;
625 const u32 shutter = ((ctrl->value - qctrl->minimum) * 1048 +
626 range / 2) / range + 1;
627 u32 old;
628
629 get_shutter(client, &old);
630 dev_dbg(&icd->dev, "Setting shutter width from %u to %u\n",
631 old, shutter);
632 if (set_shutter(client, shutter) < 0)
633 return -EIO;
634 icd->exposure = ctrl->value;
635 mt9t031->autoexposure = 0;
636 }
637 break;
638 case V4L2_CID_EXPOSURE_AUTO:
639 if (ctrl->value) {
640 const u16 vblank = MT9T031_VERTICAL_BLANK;
641 const u32 shutter_max = MT9T031_MAX_HEIGHT + vblank;
642 if (set_shutter(client, icd->height +
643 icd->y_skip_top + vblank) < 0)
644 return -EIO;
645 qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_EXPOSURE);
646 icd->exposure = (shutter_max / 2 + (icd->height +
647 icd->y_skip_top + vblank - 1) *
648 (qctrl->maximum - qctrl->minimum)) /
649 shutter_max + qctrl->minimum;
650 mt9t031->autoexposure = 1;
651 } else
652 mt9t031->autoexposure = 0;
653 break;
654 }
655 return 0;
656 }
657
658 /* Interface active, can use i2c. If it fails, it can indeed mean, that
659 * this wasn't our capture interface, so, we wait for the right one */
660 static int mt9t031_video_probe(struct soc_camera_device *icd)
661 {
662 struct i2c_client *client = to_i2c_client(icd->control);
663 struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd);
664 s32 data;
665 int ret;
666
667 /* We must have a parent by now. And it cannot be a wrong one.
668 * So this entire test is completely redundant. */
669 if (!icd->dev.parent ||
670 to_soc_camera_host(icd->dev.parent)->nr != icd->iface)
671 return -ENODEV;
672
673 /* Enable the chip */
674 data = reg_write(client, MT9T031_CHIP_ENABLE, 1);
675 dev_dbg(&icd->dev, "write: %d\n", data);
676
677 /* Read out the chip version register */
678 data = reg_read(client, MT9T031_CHIP_VERSION);
679
680 switch (data) {
681 case 0x1621:
682 mt9t031->model = V4L2_IDENT_MT9T031;
683 icd->formats = mt9t031_colour_formats;
684 icd->num_formats = ARRAY_SIZE(mt9t031_colour_formats);
685 break;
686 default:
687 ret = -ENODEV;
688 dev_err(&icd->dev,
689 "No MT9T031 chip detected, register read %x\n", data);
690 goto ei2c;
691 }
692
693 dev_info(&icd->dev, "Detected a MT9T031 chip ID %x\n", data);
694
695 /* Now that we know the model, we can start video */
696 ret = soc_camera_video_start(icd);
697 if (ret)
698 goto evstart;
699
700 return 0;
701
702 evstart:
703 ei2c:
704 return ret;
705 }
706
707 static void mt9t031_video_remove(struct soc_camera_device *icd)
708 {
709 struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd);
710
711 dev_dbg(&icd->dev, "Video %x removed: %p, %p\n", mt9t031->client->addr,
712 icd->dev.parent, icd->vdev);
713 soc_camera_video_stop(icd);
714 }
715
716 static int mt9t031_probe(struct i2c_client *client,
717 const struct i2c_device_id *did)
718 {
719 struct mt9t031 *mt9t031;
720 struct soc_camera_device *icd;
721 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
722 struct soc_camera_link *icl = client->dev.platform_data;
723 int ret;
724
725 if (!icl) {
726 dev_err(&client->dev, "MT9T031 driver needs platform data\n");
727 return -EINVAL;
728 }
729
730 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
731 dev_warn(&adapter->dev,
732 "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
733 return -EIO;
734 }
735
736 mt9t031 = kzalloc(sizeof(struct mt9t031), GFP_KERNEL);
737 if (!mt9t031)
738 return -ENOMEM;
739
740 mt9t031->client = client;
741 i2c_set_clientdata(client, mt9t031);
742
743 /* Second stage probe - when a capture adapter is there */
744 icd = &mt9t031->icd;
745 icd->ops = &mt9t031_ops;
746 icd->control = &client->dev;
747 icd->x_min = MT9T031_COLUMN_SKIP;
748 icd->y_min = MT9T031_ROW_SKIP;
749 icd->x_current = icd->x_min;
750 icd->y_current = icd->y_min;
751 icd->width_min = MT9T031_MIN_WIDTH;
752 icd->width_max = MT9T031_MAX_WIDTH;
753 icd->height_min = MT9T031_MIN_HEIGHT;
754 icd->height_max = MT9T031_MAX_HEIGHT;
755 icd->y_skip_top = 0;
756 icd->iface = icl->bus_id;
757 /* Simulated autoexposure. If enabled, we calculate shutter width
758 * ourselves in the driver based on vertical blanking and frame width */
759 mt9t031->autoexposure = 1;
760
761 mt9t031->xskip = 1;
762 mt9t031->yskip = 1;
763
764 ret = soc_camera_device_register(icd);
765 if (ret)
766 goto eisdr;
767
768 return 0;
769
770 eisdr:
771 i2c_set_clientdata(client, NULL);
772 kfree(mt9t031);
773 return ret;
774 }
775
776 static int mt9t031_remove(struct i2c_client *client)
777 {
778 struct mt9t031 *mt9t031 = i2c_get_clientdata(client);
779
780 soc_camera_device_unregister(&mt9t031->icd);
781 i2c_set_clientdata(client, NULL);
782 kfree(mt9t031);
783
784 return 0;
785 }
786
787 static const struct i2c_device_id mt9t031_id[] = {
788 { "mt9t031", 0 },
789 { }
790 };
791 MODULE_DEVICE_TABLE(i2c, mt9t031_id);
792
793 static struct i2c_driver mt9t031_i2c_driver = {
794 .driver = {
795 .name = "mt9t031",
796 },
797 .probe = mt9t031_probe,
798 .remove = mt9t031_remove,
799 .id_table = mt9t031_id,
800 };
801
802 static int __init mt9t031_mod_init(void)
803 {
804 return i2c_add_driver(&mt9t031_i2c_driver);
805 }
806
807 static void __exit mt9t031_mod_exit(void)
808 {
809 i2c_del_driver(&mt9t031_i2c_driver);
810 }
811
812 module_init(mt9t031_mod_init);
813 module_exit(mt9t031_mod_exit);
814
815 MODULE_DESCRIPTION("Micron MT9T031 Camera driver");
816 MODULE_AUTHOR("Guennadi Liakhovetski <lg@denx.de>");
817 MODULE_LICENSE("GPL v2");