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V4L/DVB (12506): soc-camera: convert to platform device
[deliverable/linux.git] / drivers / media / video / mt9t031.c
1 /*
2 * Driver for MT9T031 CMOS Image Sensor from Micron
3 *
4 * Copyright (C) 2008, Guennadi Liakhovetski, DENX Software Engineering <lg@denx.de>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11 #include <linux/videodev2.h>
12 #include <linux/slab.h>
13 #include <linux/i2c.h>
14 #include <linux/log2.h>
15
16 #include <media/v4l2-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 int model; /* V4L2_IDENT_MT9T031* codes from v4l2-chip-ident.h */
72 unsigned char autoexposure;
73 u16 xskip;
74 u16 yskip;
75 };
76
77 static int reg_read(struct i2c_client *client, const u8 reg)
78 {
79 s32 data = i2c_smbus_read_word_data(client, reg);
80 return data < 0 ? data : swab16(data);
81 }
82
83 static int reg_write(struct i2c_client *client, const u8 reg,
84 const u16 data)
85 {
86 return i2c_smbus_write_word_data(client, reg, swab16(data));
87 }
88
89 static int reg_set(struct i2c_client *client, const u8 reg,
90 const u16 data)
91 {
92 int ret;
93
94 ret = reg_read(client, reg);
95 if (ret < 0)
96 return ret;
97 return reg_write(client, reg, ret | data);
98 }
99
100 static int reg_clear(struct i2c_client *client, const u8 reg,
101 const u16 data)
102 {
103 int ret;
104
105 ret = reg_read(client, reg);
106 if (ret < 0)
107 return ret;
108 return reg_write(client, reg, ret & ~data);
109 }
110
111 static int set_shutter(struct i2c_client *client, const u32 data)
112 {
113 int ret;
114
115 ret = reg_write(client, MT9T031_SHUTTER_WIDTH_UPPER, data >> 16);
116
117 if (ret >= 0)
118 ret = reg_write(client, MT9T031_SHUTTER_WIDTH, data & 0xffff);
119
120 return ret;
121 }
122
123 static int get_shutter(struct i2c_client *client, u32 *data)
124 {
125 int ret;
126
127 ret = reg_read(client, MT9T031_SHUTTER_WIDTH_UPPER);
128 *data = ret << 16;
129
130 if (ret >= 0)
131 ret = reg_read(client, MT9T031_SHUTTER_WIDTH);
132 *data |= ret & 0xffff;
133
134 return ret < 0 ? ret : 0;
135 }
136
137 static int mt9t031_init(struct soc_camera_device *icd)
138 {
139 struct i2c_client *client = to_i2c_client(to_soc_camera_control(icd));
140 struct soc_camera_link *icl = to_soc_camera_link(icd);
141 int ret;
142
143 if (icl->power) {
144 ret = icl->power(&client->dev, 1);
145 if (ret < 0) {
146 dev_err(icd->vdev->parent,
147 "Platform failed to power-on the camera.\n");
148 return ret;
149 }
150 }
151
152 /* Disable chip output, synchronous option update */
153 ret = reg_write(client, MT9T031_RESET, 1);
154 if (ret >= 0)
155 ret = reg_write(client, MT9T031_RESET, 0);
156 if (ret >= 0)
157 ret = reg_clear(client, MT9T031_OUTPUT_CONTROL, 2);
158
159 if (ret < 0 && icl->power)
160 icl->power(&client->dev, 0);
161
162 return ret >= 0 ? 0 : -EIO;
163 }
164
165 static int mt9t031_release(struct soc_camera_device *icd)
166 {
167 struct i2c_client *client = to_i2c_client(to_soc_camera_control(icd));
168 struct soc_camera_link *icl = to_soc_camera_link(icd);
169
170 /* Disable the chip */
171 reg_clear(client, MT9T031_OUTPUT_CONTROL, 2);
172
173 if (icl->power)
174 icl->power(&client->dev, 0);
175
176 return 0;
177 }
178
179 static int mt9t031_start_capture(struct soc_camera_device *icd)
180 {
181 struct i2c_client *client = to_i2c_client(to_soc_camera_control(icd));
182
183 /* Switch to master "normal" mode */
184 if (reg_set(client, MT9T031_OUTPUT_CONTROL, 2) < 0)
185 return -EIO;
186 return 0;
187 }
188
189 static int mt9t031_stop_capture(struct soc_camera_device *icd)
190 {
191 struct i2c_client *client = to_i2c_client(to_soc_camera_control(icd));
192
193 /* Stop sensor readout */
194 if (reg_clear(client, MT9T031_OUTPUT_CONTROL, 2) < 0)
195 return -EIO;
196 return 0;
197 }
198
199 static int mt9t031_set_bus_param(struct soc_camera_device *icd,
200 unsigned long flags)
201 {
202 struct i2c_client *client = to_i2c_client(to_soc_camera_control(icd));
203
204 /* The caller should have queried our parameters, check anyway */
205 if (flags & ~MT9T031_BUS_PARAM)
206 return -EINVAL;
207
208 if (flags & SOCAM_PCLK_SAMPLE_FALLING)
209 reg_clear(client, MT9T031_PIXEL_CLOCK_CONTROL, 0x8000);
210 else
211 reg_set(client, MT9T031_PIXEL_CLOCK_CONTROL, 0x8000);
212
213 return 0;
214 }
215
216 static unsigned long mt9t031_query_bus_param(struct soc_camera_device *icd)
217 {
218 struct soc_camera_link *icl = to_soc_camera_link(icd);
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 i2c_client *client = to_i2c_client(to_soc_camera_control(icd));
239 struct mt9t031 *mt9t031 = i2c_get_clientdata(client);
240 int ret;
241 u16 xbin, ybin, width, height, left, top;
242 const u16 hblank = MT9T031_HORIZONTAL_BLANK,
243 vblank = MT9T031_VERTICAL_BLANK;
244
245 /* Make sure we don't exceed sensor limits */
246 if (rect->left + rect->width > icd->width_max)
247 rect->left = (icd->width_max - rect->width) / 2 + icd->x_min;
248
249 if (rect->top + rect->height > icd->height_max)
250 rect->top = (icd->height_max - rect->height) / 2 + icd->y_min;
251
252 width = rect->width * xskip;
253 height = rect->height * yskip;
254 left = rect->left * xskip;
255 top = rect->top * yskip;
256
257 xbin = min(xskip, (u16)3);
258 ybin = min(yskip, (u16)3);
259
260 dev_dbg(&icd->dev, "xskip %u, width %u/%u, yskip %u, height %u/%u\n",
261 xskip, width, rect->width, yskip, height, rect->height);
262
263 /* Could just do roundup(rect->left, [xy]bin * 2); but this is cheaper */
264 switch (xbin) {
265 case 2:
266 left = (left + 3) & ~3;
267 break;
268 case 3:
269 left = roundup(left, 6);
270 }
271
272 switch (ybin) {
273 case 2:
274 top = (top + 3) & ~3;
275 break;
276 case 3:
277 top = roundup(top, 6);
278 }
279
280 /* Disable register update, reconfigure atomically */
281 ret = reg_set(client, MT9T031_OUTPUT_CONTROL, 1);
282 if (ret < 0)
283 return ret;
284
285 /* Blanking and start values - default... */
286 ret = reg_write(client, MT9T031_HORIZONTAL_BLANKING, hblank);
287 if (ret >= 0)
288 ret = reg_write(client, MT9T031_VERTICAL_BLANKING, vblank);
289
290 if (yskip != mt9t031->yskip || xskip != mt9t031->xskip) {
291 /* Binning, skipping */
292 if (ret >= 0)
293 ret = reg_write(client, MT9T031_COLUMN_ADDRESS_MODE,
294 ((xbin - 1) << 4) | (xskip - 1));
295 if (ret >= 0)
296 ret = reg_write(client, MT9T031_ROW_ADDRESS_MODE,
297 ((ybin - 1) << 4) | (yskip - 1));
298 }
299 dev_dbg(&icd->dev, "new physical left %u, top %u\n", left, top);
300
301 /* The caller provides a supported format, as guaranteed by
302 * icd->try_fmt_cap(), soc_camera_s_crop() and soc_camera_cropcap() */
303 if (ret >= 0)
304 ret = reg_write(client, MT9T031_COLUMN_START, left);
305 if (ret >= 0)
306 ret = reg_write(client, MT9T031_ROW_START, top);
307 if (ret >= 0)
308 ret = reg_write(client, MT9T031_WINDOW_WIDTH, width - 1);
309 if (ret >= 0)
310 ret = reg_write(client, MT9T031_WINDOW_HEIGHT,
311 height + icd->y_skip_top - 1);
312 if (ret >= 0 && mt9t031->autoexposure) {
313 ret = set_shutter(client, height + icd->y_skip_top + vblank);
314 if (ret >= 0) {
315 const u32 shutter_max = MT9T031_MAX_HEIGHT + vblank;
316 const struct v4l2_queryctrl *qctrl =
317 soc_camera_find_qctrl(icd->ops,
318 V4L2_CID_EXPOSURE);
319 icd->exposure = (shutter_max / 2 + (height +
320 icd->y_skip_top + vblank - 1) *
321 (qctrl->maximum - qctrl->minimum)) /
322 shutter_max + qctrl->minimum;
323 }
324 }
325
326 /* Re-enable register update, commit all changes */
327 if (ret >= 0)
328 ret = reg_clear(client, MT9T031_OUTPUT_CONTROL, 1);
329
330 return ret < 0 ? ret : 0;
331 }
332
333 static int mt9t031_set_crop(struct soc_camera_device *icd,
334 struct v4l2_rect *rect)
335 {
336 struct i2c_client *client = to_i2c_client(to_soc_camera_control(icd));
337 struct mt9t031 *mt9t031 = i2c_get_clientdata(client);
338
339 /* CROP - no change in scaling, or in limits */
340 return mt9t031_set_params(icd, rect, mt9t031->xskip, mt9t031->yskip);
341 }
342
343 static int mt9t031_set_fmt(struct soc_camera_device *icd,
344 struct v4l2_format *f)
345 {
346 struct i2c_client *client = to_i2c_client(to_soc_camera_control(icd));
347 struct mt9t031 *mt9t031 = i2c_get_clientdata(client);
348 int ret;
349 u16 xskip, yskip;
350 struct v4l2_rect rect = {
351 .left = icd->x_current,
352 .top = icd->y_current,
353 .width = f->fmt.pix.width,
354 .height = f->fmt.pix.height,
355 };
356
357 /*
358 * try_fmt has put rectangle within limits.
359 * S_FMT - use binning and skipping for scaling, recalculate
360 * limits, used for cropping
361 */
362 /* Is this more optimal than just a division? */
363 for (xskip = 8; xskip > 1; xskip--)
364 if (rect.width * xskip <= MT9T031_MAX_WIDTH)
365 break;
366
367 for (yskip = 8; yskip > 1; yskip--)
368 if (rect.height * yskip <= MT9T031_MAX_HEIGHT)
369 break;
370
371 recalculate_limits(icd, xskip, yskip);
372
373 ret = mt9t031_set_params(icd, &rect, xskip, yskip);
374 if (!ret) {
375 mt9t031->xskip = xskip;
376 mt9t031->yskip = yskip;
377 }
378
379 return ret;
380 }
381
382 static int mt9t031_try_fmt(struct soc_camera_device *icd,
383 struct v4l2_format *f)
384 {
385 struct v4l2_pix_format *pix = &f->fmt.pix;
386
387 v4l_bound_align_image(
388 &pix->width, MT9T031_MIN_WIDTH, MT9T031_MAX_WIDTH, 1,
389 &pix->height, MT9T031_MIN_HEIGHT, MT9T031_MAX_HEIGHT, 1, 0);
390
391 return 0;
392 }
393
394 static int mt9t031_get_chip_id(struct soc_camera_device *icd,
395 struct v4l2_dbg_chip_ident *id)
396 {
397 struct i2c_client *client = to_i2c_client(to_soc_camera_control(icd));
398 struct mt9t031 *mt9t031 = i2c_get_clientdata(client);
399
400 if (id->match.type != V4L2_CHIP_MATCH_I2C_ADDR)
401 return -EINVAL;
402
403 if (id->match.addr != 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(to_soc_camera_control(icd));
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(to_soc_camera_control(icd));
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_get_control(struct soc_camera_device *, struct v4l2_control *);
497 static int mt9t031_set_control(struct soc_camera_device *, struct v4l2_control *);
498
499 static struct soc_camera_ops mt9t031_ops = {
500 .owner = THIS_MODULE,
501 .init = mt9t031_init,
502 .release = mt9t031_release,
503 .start_capture = mt9t031_start_capture,
504 .stop_capture = mt9t031_stop_capture,
505 .set_crop = mt9t031_set_crop,
506 .set_fmt = mt9t031_set_fmt,
507 .try_fmt = mt9t031_try_fmt,
508 .set_bus_param = mt9t031_set_bus_param,
509 .query_bus_param = mt9t031_query_bus_param,
510 .controls = mt9t031_controls,
511 .num_controls = ARRAY_SIZE(mt9t031_controls),
512 .get_control = mt9t031_get_control,
513 .set_control = mt9t031_set_control,
514 .get_chip_id = mt9t031_get_chip_id,
515 #ifdef CONFIG_VIDEO_ADV_DEBUG
516 .get_register = mt9t031_get_register,
517 .set_register = mt9t031_set_register,
518 #endif
519 };
520
521 static int mt9t031_get_control(struct soc_camera_device *icd, struct v4l2_control *ctrl)
522 {
523 struct i2c_client *client = to_i2c_client(to_soc_camera_control(icd));
524 struct mt9t031 *mt9t031 = i2c_get_clientdata(client);
525 int data;
526
527 switch (ctrl->id) {
528 case V4L2_CID_VFLIP:
529 data = reg_read(client, MT9T031_READ_MODE_2);
530 if (data < 0)
531 return -EIO;
532 ctrl->value = !!(data & 0x8000);
533 break;
534 case V4L2_CID_HFLIP:
535 data = reg_read(client, MT9T031_READ_MODE_2);
536 if (data < 0)
537 return -EIO;
538 ctrl->value = !!(data & 0x4000);
539 break;
540 case V4L2_CID_EXPOSURE_AUTO:
541 ctrl->value = mt9t031->autoexposure;
542 break;
543 }
544 return 0;
545 }
546
547 static int mt9t031_set_control(struct soc_camera_device *icd, struct v4l2_control *ctrl)
548 {
549 struct i2c_client *client = to_i2c_client(to_soc_camera_control(icd));
550 struct mt9t031 *mt9t031 = i2c_get_clientdata(client);
551 const struct v4l2_queryctrl *qctrl;
552 int data;
553
554 qctrl = soc_camera_find_qctrl(&mt9t031_ops, ctrl->id);
555
556 if (!qctrl)
557 return -EINVAL;
558
559 switch (ctrl->id) {
560 case V4L2_CID_VFLIP:
561 if (ctrl->value)
562 data = reg_set(client, MT9T031_READ_MODE_2, 0x8000);
563 else
564 data = reg_clear(client, MT9T031_READ_MODE_2, 0x8000);
565 if (data < 0)
566 return -EIO;
567 break;
568 case V4L2_CID_HFLIP:
569 if (ctrl->value)
570 data = reg_set(client, MT9T031_READ_MODE_2, 0x4000);
571 else
572 data = reg_clear(client, MT9T031_READ_MODE_2, 0x4000);
573 if (data < 0)
574 return -EIO;
575 break;
576 case V4L2_CID_GAIN:
577 if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum)
578 return -EINVAL;
579 /* See Datasheet Table 7, Gain settings. */
580 if (ctrl->value <= qctrl->default_value) {
581 /* Pack it into 0..1 step 0.125, register values 0..8 */
582 unsigned long range = qctrl->default_value - qctrl->minimum;
583 data = ((ctrl->value - qctrl->minimum) * 8 + range / 2) / range;
584
585 dev_dbg(&icd->dev, "Setting gain %d\n", data);
586 data = reg_write(client, MT9T031_GLOBAL_GAIN, data);
587 if (data < 0)
588 return -EIO;
589 } else {
590 /* Pack it into 1.125..128 variable step, register values 9..0x7860 */
591 /* We assume qctrl->maximum - qctrl->default_value - 1 > 0 */
592 unsigned long range = qctrl->maximum - qctrl->default_value - 1;
593 /* calculated gain: map 65..127 to 9..1024 step 0.125 */
594 unsigned long gain = ((ctrl->value - qctrl->default_value - 1) *
595 1015 + range / 2) / range + 9;
596
597 if (gain <= 32) /* calculated gain 9..32 -> 9..32 */
598 data = gain;
599 else if (gain <= 64) /* calculated gain 33..64 -> 0x51..0x60 */
600 data = ((gain - 32) * 16 + 16) / 32 + 80;
601 else
602 /* calculated gain 65..1024 -> (1..120) << 8 + 0x60 */
603 data = (((gain - 64 + 7) * 32) & 0xff00) | 0x60;
604
605 dev_dbg(&icd->dev, "Setting gain from 0x%x to 0x%x\n",
606 reg_read(client, MT9T031_GLOBAL_GAIN), data);
607 data = reg_write(client, MT9T031_GLOBAL_GAIN, data);
608 if (data < 0)
609 return -EIO;
610 }
611
612 /* Success */
613 icd->gain = ctrl->value;
614 break;
615 case V4L2_CID_EXPOSURE:
616 /* mt9t031 has maximum == default */
617 if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum)
618 return -EINVAL;
619 else {
620 const unsigned long range = qctrl->maximum - qctrl->minimum;
621 const u32 shutter = ((ctrl->value - qctrl->minimum) * 1048 +
622 range / 2) / range + 1;
623 u32 old;
624
625 get_shutter(client, &old);
626 dev_dbg(&icd->dev, "Setting shutter width from %u to %u\n",
627 old, shutter);
628 if (set_shutter(client, shutter) < 0)
629 return -EIO;
630 icd->exposure = ctrl->value;
631 mt9t031->autoexposure = 0;
632 }
633 break;
634 case V4L2_CID_EXPOSURE_AUTO:
635 if (ctrl->value) {
636 const u16 vblank = MT9T031_VERTICAL_BLANK;
637 const u32 shutter_max = MT9T031_MAX_HEIGHT + vblank;
638 if (set_shutter(client, icd->height +
639 icd->y_skip_top + vblank) < 0)
640 return -EIO;
641 qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_EXPOSURE);
642 icd->exposure = (shutter_max / 2 + (icd->height +
643 icd->y_skip_top + vblank - 1) *
644 (qctrl->maximum - qctrl->minimum)) /
645 shutter_max + qctrl->minimum;
646 mt9t031->autoexposure = 1;
647 } else
648 mt9t031->autoexposure = 0;
649 break;
650 }
651 return 0;
652 }
653
654 /* Interface active, can use i2c. If it fails, it can indeed mean, that
655 * this wasn't our capture interface, so, we wait for the right one */
656 static int mt9t031_video_probe(struct soc_camera_device *icd,
657 struct i2c_client *client)
658 {
659 struct mt9t031 *mt9t031 = i2c_get_clientdata(client);
660 s32 data;
661 int ret;
662
663 /* We must have a parent by now. And it cannot be a wrong one.
664 * So this entire test is completely redundant. */
665 if (!icd->dev.parent ||
666 to_soc_camera_host(icd->dev.parent)->nr != icd->iface)
667 return -ENODEV;
668
669 /* Switch master clock on */
670 ret = soc_camera_video_start(icd, &client->dev);
671 if (ret)
672 return ret;
673
674 /* Enable the chip */
675 data = reg_write(client, 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(client, MT9T031_CHIP_VERSION);
680
681 soc_camera_video_stop(icd);
682
683 switch (data) {
684 case 0x1621:
685 mt9t031->model = V4L2_IDENT_MT9T031;
686 icd->formats = mt9t031_colour_formats;
687 icd->num_formats = ARRAY_SIZE(mt9t031_colour_formats);
688 break;
689 default:
690 dev_err(&icd->dev,
691 "No MT9T031 chip detected, register read %x\n", data);
692 return -ENODEV;
693 }
694
695 dev_info(&icd->dev, "Detected a MT9T031 chip ID %x\n", data);
696
697 return 0;
698 }
699
700 static int mt9t031_probe(struct i2c_client *client,
701 const struct i2c_device_id *did)
702 {
703 struct mt9t031 *mt9t031;
704 struct soc_camera_device *icd = client->dev.platform_data;
705 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
706 struct soc_camera_link *icl;
707 int ret;
708
709 if (!icd) {
710 dev_err(&client->dev, "MT9T031: missing soc-camera data!\n");
711 return -EINVAL;
712 }
713
714 icl = to_soc_camera_link(icd);
715 if (!icl) {
716 dev_err(&client->dev, "MT9T031 driver needs platform data\n");
717 return -EINVAL;
718 }
719
720 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
721 dev_warn(&adapter->dev,
722 "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
723 return -EIO;
724 }
725
726 mt9t031 = kzalloc(sizeof(struct mt9t031), GFP_KERNEL);
727 if (!mt9t031)
728 return -ENOMEM;
729
730 i2c_set_clientdata(client, mt9t031);
731
732 /* Second stage probe - when a capture adapter is there */
733 icd->ops = &mt9t031_ops;
734 icd->x_min = MT9T031_COLUMN_SKIP;
735 icd->y_min = MT9T031_ROW_SKIP;
736 icd->x_current = icd->x_min;
737 icd->y_current = icd->y_min;
738 icd->width_min = MT9T031_MIN_WIDTH;
739 icd->width_max = MT9T031_MAX_WIDTH;
740 icd->height_min = MT9T031_MIN_HEIGHT;
741 icd->height_max = MT9T031_MAX_HEIGHT;
742 icd->y_skip_top = 0;
743 /* Simulated autoexposure. If enabled, we calculate shutter width
744 * ourselves in the driver based on vertical blanking and frame width */
745 mt9t031->autoexposure = 1;
746
747 mt9t031->xskip = 1;
748 mt9t031->yskip = 1;
749
750 ret = mt9t031_video_probe(icd, client);
751 if (ret) {
752 icd->ops = NULL;
753 i2c_set_clientdata(client, NULL);
754 kfree(mt9t031);
755 }
756
757 return ret;
758 }
759
760 static int mt9t031_remove(struct i2c_client *client)
761 {
762 struct mt9t031 *mt9t031 = i2c_get_clientdata(client);
763 struct soc_camera_device *icd = client->dev.platform_data;
764
765 icd->ops = NULL;
766 i2c_set_clientdata(client, NULL);
767 client->driver = NULL;
768 kfree(mt9t031);
769
770 return 0;
771 }
772
773 static const struct i2c_device_id mt9t031_id[] = {
774 { "mt9t031", 0 },
775 { }
776 };
777 MODULE_DEVICE_TABLE(i2c, mt9t031_id);
778
779 static struct i2c_driver mt9t031_i2c_driver = {
780 .driver = {
781 .name = "mt9t031",
782 },
783 .probe = mt9t031_probe,
784 .remove = mt9t031_remove,
785 .id_table = mt9t031_id,
786 };
787
788 static int __init mt9t031_mod_init(void)
789 {
790 return i2c_add_driver(&mt9t031_i2c_driver);
791 }
792
793 static void __exit mt9t031_mod_exit(void)
794 {
795 i2c_del_driver(&mt9t031_i2c_driver);
796 }
797
798 module_init(mt9t031_mod_init);
799 module_exit(mt9t031_mod_exit);
800
801 MODULE_DESCRIPTION("Micron MT9T031 Camera driver");
802 MODULE_AUTHOR("Guennadi Liakhovetski <lg@denx.de>");
803 MODULE_LICENSE("GPL v2");
Linux kernel - Deliverables
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