?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Linux 2.6.34-rc3
[pohmelfs.git] / drivers / media / video / mt9m001.c
blobb62c0bd3f8ea013de803ceac7f3f25f1c7a9bb57
1 /*
2 * Driver for MT9M001 CMOS Image Sensor from Micron
3 *
4 * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.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 /*
21 * mt9m001 i2c address 0x5d
22 * The platform has to define ctruct i2c_board_info objects and link to them
23 * from struct soc_camera_link
24 */
25
26 /* mt9m001 selected register addresses */
27 #define MT9M001_CHIP_VERSION 0x00
28 #define MT9M001_ROW_START 0x01
29 #define MT9M001_COLUMN_START 0x02
30 #define MT9M001_WINDOW_HEIGHT 0x03
31 #define MT9M001_WINDOW_WIDTH 0x04
32 #define MT9M001_HORIZONTAL_BLANKING 0x05
33 #define MT9M001_VERTICAL_BLANKING 0x06
34 #define MT9M001_OUTPUT_CONTROL 0x07
35 #define MT9M001_SHUTTER_WIDTH 0x09
36 #define MT9M001_FRAME_RESTART 0x0b
37 #define MT9M001_SHUTTER_DELAY 0x0c
38 #define MT9M001_RESET 0x0d
39 #define MT9M001_READ_OPTIONS1 0x1e
40 #define MT9M001_READ_OPTIONS2 0x20
41 #define MT9M001_GLOBAL_GAIN 0x35
42 #define MT9M001_CHIP_ENABLE 0xF1
43
44 #define MT9M001_MAX_WIDTH 1280
45 #define MT9M001_MAX_HEIGHT 1024
46 #define MT9M001_MIN_WIDTH 48
47 #define MT9M001_MIN_HEIGHT 32
48 #define MT9M001_COLUMN_SKIP 20
49 #define MT9M001_ROW_SKIP 12
50
51 /* MT9M001 has only one fixed colorspace per pixelcode */
52 struct mt9m001_datafmt {
53 enum v4l2_mbus_pixelcode code;
54 enum v4l2_colorspace colorspace;
55 };
56
57 /* Find a data format by a pixel code in an array */
58 static const struct mt9m001_datafmt *mt9m001_find_datafmt(
59 enum v4l2_mbus_pixelcode code, const struct mt9m001_datafmt *fmt,
60 int n)
61 {
62 int i;
63 for (i = 0; i < n; i++)
64 if (fmt[i].code == code)
65 return fmt + i;
66
67 return NULL;
68 }
69
70 static const struct mt9m001_datafmt mt9m001_colour_fmts[] = {
71 /*
72 * Order important: first natively supported,
73 * second supported with a GPIO extender
74 */
75 {V4L2_MBUS_FMT_SBGGR10_1X10, V4L2_COLORSPACE_SRGB},
76 {V4L2_MBUS_FMT_SBGGR8_1X8, V4L2_COLORSPACE_SRGB},
77 };
78
79 static const struct mt9m001_datafmt mt9m001_monochrome_fmts[] = {
80 /* Order important - see above */
81 {V4L2_MBUS_FMT_Y10_1X10, V4L2_COLORSPACE_JPEG},
82 {V4L2_MBUS_FMT_GREY8_1X8, V4L2_COLORSPACE_JPEG},
83 };
84
85 struct mt9m001 {
86 struct v4l2_subdev subdev;
87 struct v4l2_rect rect; /* Sensor window */
88 const struct mt9m001_datafmt *fmt;
89 const struct mt9m001_datafmt *fmts;
90 int num_fmts;
91 int model; /* V4L2_IDENT_MT9M001* codes from v4l2-chip-ident.h */
92 unsigned int gain;
93 unsigned int exposure;
94 unsigned short y_skip_top; /* Lines to skip at the top */
95 unsigned char autoexposure;
96 };
97
98 static struct mt9m001 *to_mt9m001(const struct i2c_client *client)
99 {
100 return container_of(i2c_get_clientdata(client), struct mt9m001, subdev);
101 }
102
103 static int reg_read(struct i2c_client *client, const u8 reg)
104 {
105 s32 data = i2c_smbus_read_word_data(client, reg);
106 return data < 0 ? data : swab16(data);
107 }
108
109 static int reg_write(struct i2c_client *client, const u8 reg,
110 const u16 data)
111 {
112 return i2c_smbus_write_word_data(client, reg, swab16(data));
113 }
114
115 static int reg_set(struct i2c_client *client, const u8 reg,
116 const u16 data)
117 {
118 int ret;
119
120 ret = reg_read(client, reg);
121 if (ret < 0)
122 return ret;
123 return reg_write(client, reg, ret | data);
124 }
125
126 static int reg_clear(struct i2c_client *client, const u8 reg,
127 const u16 data)
128 {
129 int ret;
130
131 ret = reg_read(client, reg);
132 if (ret < 0)
133 return ret;
134 return reg_write(client, reg, ret & ~data);
135 }
136
137 static int mt9m001_init(struct i2c_client *client)
138 {
139 int ret;
140
141 dev_dbg(&client->dev, "%s\n", __func__);
142
143 /*
144 * We don't know, whether platform provides reset, issue a soft reset
145 * too. This returns all registers to their default values.
146 */
147 ret = reg_write(client, MT9M001_RESET, 1);
148 if (!ret)
149 ret = reg_write(client, MT9M001_RESET, 0);
150
151 /* Disable chip, synchronous option update */
152 if (!ret)
153 ret = reg_write(client, MT9M001_OUTPUT_CONTROL, 0);
154
155 return ret;
156 }
157
158 static int mt9m001_s_stream(struct v4l2_subdev *sd, int enable)
159 {
160 struct i2c_client *client = sd->priv;
161
162 /* Switch to master "normal" mode or stop sensor readout */
163 if (reg_write(client, MT9M001_OUTPUT_CONTROL, enable ? 2 : 0) < 0)
164 return -EIO;
165 return 0;
166 }
167
168 static int mt9m001_set_bus_param(struct soc_camera_device *icd,
169 unsigned long flags)
170 {
171 struct soc_camera_link *icl = to_soc_camera_link(icd);
172 unsigned long width_flag = flags & SOCAM_DATAWIDTH_MASK;
173
174 /* Only one width bit may be set */
175 if (!is_power_of_2(width_flag))
176 return -EINVAL;
177
178 if (icl->set_bus_param)
179 return icl->set_bus_param(icl, width_flag);
180
181 /*
182 * Without board specific bus width settings we only support the
183 * sensors native bus width
184 */
185 if (width_flag == SOCAM_DATAWIDTH_10)
186 return 0;
187
188 return -EINVAL;
189 }
190
191 static unsigned long mt9m001_query_bus_param(struct soc_camera_device *icd)
192 {
193 struct soc_camera_link *icl = to_soc_camera_link(icd);
194 /* MT9M001 has all capture_format parameters fixed */
195 unsigned long flags = SOCAM_PCLK_SAMPLE_FALLING |
196 SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_HIGH |
197 SOCAM_DATA_ACTIVE_HIGH | SOCAM_MASTER;
198
199 if (icl->query_bus_param)
200 flags |= icl->query_bus_param(icl) & SOCAM_DATAWIDTH_MASK;
201 else
202 flags |= SOCAM_DATAWIDTH_10;
203
204 return soc_camera_apply_sensor_flags(icl, flags);
205 }
206
207 static int mt9m001_s_crop(struct v4l2_subdev *sd, struct v4l2_crop *a)
208 {
209 struct i2c_client *client = sd->priv;
210 struct mt9m001 *mt9m001 = to_mt9m001(client);
211 struct v4l2_rect rect = a->c;
212 struct soc_camera_device *icd = client->dev.platform_data;
213 int ret;
214 const u16 hblank = 9, vblank = 25;
215 unsigned int total_h;
216
217 if (mt9m001->fmts == mt9m001_colour_fmts)
218 /*
219 * Bayer format - even number of rows for simplicity,
220 * but let the user play with the top row.
221 */
222 rect.height = ALIGN(rect.height, 2);
223
224 /* Datasheet requirement: see register description */
225 rect.width = ALIGN(rect.width, 2);
226 rect.left = ALIGN(rect.left, 2);
227
228 soc_camera_limit_side(&rect.left, &rect.width,
229 MT9M001_COLUMN_SKIP, MT9M001_MIN_WIDTH, MT9M001_MAX_WIDTH);
230
231 soc_camera_limit_side(&rect.top, &rect.height,
232 MT9M001_ROW_SKIP, MT9M001_MIN_HEIGHT, MT9M001_MAX_HEIGHT);
233
234 total_h = rect.height + mt9m001->y_skip_top + vblank;
235
236 /* Blanking and start values - default... */
237 ret = reg_write(client, MT9M001_HORIZONTAL_BLANKING, hblank);
238 if (!ret)
239 ret = reg_write(client, MT9M001_VERTICAL_BLANKING, vblank);
240
241 /*
242 * The caller provides a supported format, as verified per
243 * call to icd->try_fmt()
244 */
245 if (!ret)
246 ret = reg_write(client, MT9M001_COLUMN_START, rect.left);
247 if (!ret)
248 ret = reg_write(client, MT9M001_ROW_START, rect.top);
249 if (!ret)
250 ret = reg_write(client, MT9M001_WINDOW_WIDTH, rect.width - 1);
251 if (!ret)
252 ret = reg_write(client, MT9M001_WINDOW_HEIGHT,
253 rect.height + mt9m001->y_skip_top - 1);
254 if (!ret && mt9m001->autoexposure) {
255 ret = reg_write(client, MT9M001_SHUTTER_WIDTH, total_h);
256 if (!ret) {
257 const struct v4l2_queryctrl *qctrl =
258 soc_camera_find_qctrl(icd->ops,
259 V4L2_CID_EXPOSURE);
260 mt9m001->exposure = (524 + (total_h - 1) *
261 (qctrl->maximum - qctrl->minimum)) /
262 1048 + qctrl->minimum;
263 }
264 }
265
266 if (!ret)
267 mt9m001->rect = rect;
268
269 return ret;
270 }
271
272 static int mt9m001_g_crop(struct v4l2_subdev *sd, struct v4l2_crop *a)
273 {
274 struct i2c_client *client = sd->priv;
275 struct mt9m001 *mt9m001 = to_mt9m001(client);
276
277 a->c = mt9m001->rect;
278 a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
279
280 return 0;
281 }
282
283 static int mt9m001_cropcap(struct v4l2_subdev *sd, struct v4l2_cropcap *a)
284 {
285 a->bounds.left = MT9M001_COLUMN_SKIP;
286 a->bounds.top = MT9M001_ROW_SKIP;
287 a->bounds.width = MT9M001_MAX_WIDTH;
288 a->bounds.height = MT9M001_MAX_HEIGHT;
289 a->defrect = a->bounds;
290 a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
291 a->pixelaspect.numerator = 1;
292 a->pixelaspect.denominator = 1;
293
294 return 0;
295 }
296
297 static int mt9m001_g_fmt(struct v4l2_subdev *sd,
298 struct v4l2_mbus_framefmt *mf)
299 {
300 struct i2c_client *client = sd->priv;
301 struct mt9m001 *mt9m001 = to_mt9m001(client);
302
303 mf->width = mt9m001->rect.width;
304 mf->height = mt9m001->rect.height;
305 mf->code = mt9m001->fmt->code;
306 mf->colorspace = mt9m001->fmt->colorspace;
307 mf->field = V4L2_FIELD_NONE;
308
309 return 0;
310 }
311
312 static int mt9m001_s_fmt(struct v4l2_subdev *sd,
313 struct v4l2_mbus_framefmt *mf)
314 {
315 struct i2c_client *client = sd->priv;
316 struct mt9m001 *mt9m001 = to_mt9m001(client);
317 struct v4l2_crop a = {
318 .c = {
319 .left = mt9m001->rect.left,
320 .top = mt9m001->rect.top,
321 .width = mf->width,
322 .height = mf->height,
323 },
324 };
325 int ret;
326
327 /* No support for scaling so far, just crop. TODO: use skipping */
328 ret = mt9m001_s_crop(sd, &a);
329 if (!ret) {
330 mf->width = mt9m001->rect.width;
331 mf->height = mt9m001->rect.height;
332 mt9m001->fmt = mt9m001_find_datafmt(mf->code,
333 mt9m001->fmts, mt9m001->num_fmts);
334 mf->colorspace = mt9m001->fmt->colorspace;
335 }
336
337 return ret;
338 }
339
340 static int mt9m001_try_fmt(struct v4l2_subdev *sd,
341 struct v4l2_mbus_framefmt *mf)
342 {
343 struct i2c_client *client = sd->priv;
344 struct mt9m001 *mt9m001 = to_mt9m001(client);
345 const struct mt9m001_datafmt *fmt;
346
347 v4l_bound_align_image(&mf->width, MT9M001_MIN_WIDTH,
348 MT9M001_MAX_WIDTH, 1,
349 &mf->height, MT9M001_MIN_HEIGHT + mt9m001->y_skip_top,
350 MT9M001_MAX_HEIGHT + mt9m001->y_skip_top, 0, 0);
351
352 if (mt9m001->fmts == mt9m001_colour_fmts)
353 mf->height = ALIGN(mf->height - 1, 2);
354
355 fmt = mt9m001_find_datafmt(mf->code, mt9m001->fmts,
356 mt9m001->num_fmts);
357 if (!fmt) {
358 fmt = mt9m001->fmt;
359 mf->code = fmt->code;
360 }
361
362 mf->colorspace = fmt->colorspace;
363
364 return 0;
365 }
366
367 static int mt9m001_g_chip_ident(struct v4l2_subdev *sd,
368 struct v4l2_dbg_chip_ident *id)
369 {
370 struct i2c_client *client = sd->priv;
371 struct mt9m001 *mt9m001 = to_mt9m001(client);
372
373 if (id->match.type != V4L2_CHIP_MATCH_I2C_ADDR)
374 return -EINVAL;
375
376 if (id->match.addr != client->addr)
377 return -ENODEV;
378
379 id->ident = mt9m001->model;
380 id->revision = 0;
381
382 return 0;
383 }
384
385 #ifdef CONFIG_VIDEO_ADV_DEBUG
386 static int mt9m001_g_register(struct v4l2_subdev *sd,
387 struct v4l2_dbg_register *reg)
388 {
389 struct i2c_client *client = sd->priv;
390
391 if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
392 return -EINVAL;
393
394 if (reg->match.addr != client->addr)
395 return -ENODEV;
396
397 reg->size = 2;
398 reg->val = reg_read(client, reg->reg);
399
400 if (reg->val > 0xffff)
401 return -EIO;
402
403 return 0;
404 }
405
406 static int mt9m001_s_register(struct v4l2_subdev *sd,
407 struct v4l2_dbg_register *reg)
408 {
409 struct i2c_client *client = sd->priv;
410
411 if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
412 return -EINVAL;
413
414 if (reg->match.addr != client->addr)
415 return -ENODEV;
416
417 if (reg_write(client, reg->reg, reg->val) < 0)
418 return -EIO;
419
420 return 0;
421 }
422 #endif
423
424 static const struct v4l2_queryctrl mt9m001_controls[] = {
425 {
426 .id = V4L2_CID_VFLIP,
427 .type = V4L2_CTRL_TYPE_BOOLEAN,
428 .name = "Flip Vertically",
429 .minimum = 0,
430 .maximum = 1,
431 .step = 1,
432 .default_value = 0,
433 }, {
434 .id = V4L2_CID_GAIN,
435 .type = V4L2_CTRL_TYPE_INTEGER,
436 .name = "Gain",
437 .minimum = 0,
438 .maximum = 127,
439 .step = 1,
440 .default_value = 64,
441 .flags = V4L2_CTRL_FLAG_SLIDER,
442 }, {
443 .id = V4L2_CID_EXPOSURE,
444 .type = V4L2_CTRL_TYPE_INTEGER,
445 .name = "Exposure",
446 .minimum = 1,
447 .maximum = 255,
448 .step = 1,
449 .default_value = 255,
450 .flags = V4L2_CTRL_FLAG_SLIDER,
451 }, {
452 .id = V4L2_CID_EXPOSURE_AUTO,
453 .type = V4L2_CTRL_TYPE_BOOLEAN,
454 .name = "Automatic Exposure",
455 .minimum = 0,
456 .maximum = 1,
457 .step = 1,
458 .default_value = 1,
459 }
460 };
461
462 static struct soc_camera_ops mt9m001_ops = {
463 .set_bus_param = mt9m001_set_bus_param,
464 .query_bus_param = mt9m001_query_bus_param,
465 .controls = mt9m001_controls,
466 .num_controls = ARRAY_SIZE(mt9m001_controls),
467 };
468
469 static int mt9m001_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
470 {
471 struct i2c_client *client = sd->priv;
472 struct mt9m001 *mt9m001 = to_mt9m001(client);
473 int data;
474
475 switch (ctrl->id) {
476 case V4L2_CID_VFLIP:
477 data = reg_read(client, MT9M001_READ_OPTIONS2);
478 if (data < 0)
479 return -EIO;
480 ctrl->value = !!(data & 0x8000);
481 break;
482 case V4L2_CID_EXPOSURE_AUTO:
483 ctrl->value = mt9m001->autoexposure;
484 break;
485 case V4L2_CID_GAIN:
486 ctrl->value = mt9m001->gain;
487 break;
488 case V4L2_CID_EXPOSURE:
489 ctrl->value = mt9m001->exposure;
490 break;
491 }
492 return 0;
493 }
494
495 static int mt9m001_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
496 {
497 struct i2c_client *client = sd->priv;
498 struct mt9m001 *mt9m001 = to_mt9m001(client);
499 struct soc_camera_device *icd = client->dev.platform_data;
500 const struct v4l2_queryctrl *qctrl;
501 int data;
502
503 qctrl = soc_camera_find_qctrl(&mt9m001_ops, ctrl->id);
504
505 if (!qctrl)
506 return -EINVAL;
507
508 switch (ctrl->id) {
509 case V4L2_CID_VFLIP:
510 if (ctrl->value)
511 data = reg_set(client, MT9M001_READ_OPTIONS2, 0x8000);
512 else
513 data = reg_clear(client, MT9M001_READ_OPTIONS2, 0x8000);
514 if (data < 0)
515 return -EIO;
516 break;
517 case V4L2_CID_GAIN:
518 if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum)
519 return -EINVAL;
520 /* See Datasheet Table 7, Gain settings. */
521 if (ctrl->value <= qctrl->default_value) {
522 /* Pack it into 0..1 step 0.125, register values 0..8 */
523 unsigned long range = qctrl->default_value - qctrl->minimum;
524 data = ((ctrl->value - qctrl->minimum) * 8 + range / 2) / range;
525
526 dev_dbg(&client->dev, "Setting gain %d\n", data);
527 data = reg_write(client, MT9M001_GLOBAL_GAIN, data);
528 if (data < 0)
529 return -EIO;
530 } else {
531 /* Pack it into 1.125..15 variable step, register values 9..67 */
532 /* We assume qctrl->maximum - qctrl->default_value - 1 > 0 */
533 unsigned long range = qctrl->maximum - qctrl->default_value - 1;
534 unsigned long gain = ((ctrl->value - qctrl->default_value - 1) *
535 111 + range / 2) / range + 9;
536
537 if (gain <= 32)
538 data = gain;
539 else if (gain <= 64)
540 data = ((gain - 32) * 16 + 16) / 32 + 80;
541 else
542 data = ((gain - 64) * 7 + 28) / 56 + 96;
543
544 dev_dbg(&client->dev, "Setting gain from %d to %d\n",
545 reg_read(client, MT9M001_GLOBAL_GAIN), data);
546 data = reg_write(client, MT9M001_GLOBAL_GAIN, data);
547 if (data < 0)
548 return -EIO;
549 }
550
551 /* Success */
552 mt9m001->gain = ctrl->value;
553 break;
554 case V4L2_CID_EXPOSURE:
555 /* mt9m001 has maximum == default */
556 if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum)
557 return -EINVAL;
558 else {
559 unsigned long range = qctrl->maximum - qctrl->minimum;
560 unsigned long shutter = ((ctrl->value - qctrl->minimum) * 1048 +
561 range / 2) / range + 1;
562
563 dev_dbg(&client->dev,
564 "Setting shutter width from %d to %lu\n",
565 reg_read(client, MT9M001_SHUTTER_WIDTH),
566 shutter);
567 if (reg_write(client, MT9M001_SHUTTER_WIDTH, shutter) < 0)
568 return -EIO;
569 mt9m001->exposure = ctrl->value;
570 mt9m001->autoexposure = 0;
571 }
572 break;
573 case V4L2_CID_EXPOSURE_AUTO:
574 if (ctrl->value) {
575 const u16 vblank = 25;
576 unsigned int total_h = mt9m001->rect.height +
577 mt9m001->y_skip_top + vblank;
578 if (reg_write(client, MT9M001_SHUTTER_WIDTH,
579 total_h) < 0)
580 return -EIO;
581 qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_EXPOSURE);
582 mt9m001->exposure = (524 + (total_h - 1) *
583 (qctrl->maximum - qctrl->minimum)) /
584 1048 + qctrl->minimum;
585 mt9m001->autoexposure = 1;
586 } else
587 mt9m001->autoexposure = 0;
588 break;
589 }
590 return 0;
591 }
592
593 /*
594 * Interface active, can use i2c. If it fails, it can indeed mean, that
595 * this wasn't our capture interface, so, we wait for the right one
596 */
597 static int mt9m001_video_probe(struct soc_camera_device *icd,
598 struct i2c_client *client)
599 {
600 struct mt9m001 *mt9m001 = to_mt9m001(client);
601 struct soc_camera_link *icl = to_soc_camera_link(icd);
602 s32 data;
603 unsigned long flags;
604 int ret;
605
606 /*
607 * We must have a parent by now. And it cannot be a wrong one.
608 * So this entire test is completely redundant.
609 */
610 if (!icd->dev.parent ||
611 to_soc_camera_host(icd->dev.parent)->nr != icd->iface)
612 return -ENODEV;
613
614 /* Enable the chip */
615 data = reg_write(client, MT9M001_CHIP_ENABLE, 1);
616 dev_dbg(&client->dev, "write: %d\n", data);
617
618 /* Read out the chip version register */
619 data = reg_read(client, MT9M001_CHIP_VERSION);
620
621 /* must be 0x8411 or 0x8421 for colour sensor and 8431 for bw */
622 switch (data) {
623 case 0x8411:
624 case 0x8421:
625 mt9m001->model = V4L2_IDENT_MT9M001C12ST;
626 mt9m001->fmts = mt9m001_colour_fmts;
627 break;
628 case 0x8431:
629 mt9m001->model = V4L2_IDENT_MT9M001C12STM;
630 mt9m001->fmts = mt9m001_monochrome_fmts;
631 break;
632 default:
633 dev_err(&client->dev,
634 "No MT9M001 chip detected, register read %x\n", data);
635 return -ENODEV;
636 }
637
638 mt9m001->num_fmts = 0;
639
640 /*
641 * This is a 10bit sensor, so by default we only allow 10bit.
642 * The platform may support different bus widths due to
643 * different routing of the data lines.
644 */
645 if (icl->query_bus_param)
646 flags = icl->query_bus_param(icl);
647 else
648 flags = SOCAM_DATAWIDTH_10;
649
650 if (flags & SOCAM_DATAWIDTH_10)
651 mt9m001->num_fmts++;
652 else
653 mt9m001->fmts++;
654
655 if (flags & SOCAM_DATAWIDTH_8)
656 mt9m001->num_fmts++;
657
658 mt9m001->fmt = &mt9m001->fmts[0];
659
660 dev_info(&client->dev, "Detected a MT9M001 chip ID %x (%s)\n", data,
661 data == 0x8431 ? "C12STM" : "C12ST");
662
663 ret = mt9m001_init(client);
664 if (ret < 0)
665 dev_err(&client->dev, "Failed to initialise the camera\n");
666
667 /* mt9m001_init() has reset the chip, returning registers to defaults */
668 mt9m001->gain = 64;
669 mt9m001->exposure = 255;
670
671 return ret;
672 }
673
674 static void mt9m001_video_remove(struct soc_camera_device *icd)
675 {
676 struct soc_camera_link *icl = to_soc_camera_link(icd);
677
678 dev_dbg(&icd->dev, "Video removed: %p, %p\n",
679 icd->dev.parent, icd->vdev);
680 if (icl->free_bus)
681 icl->free_bus(icl);
682 }
683
684 static int mt9m001_g_skip_top_lines(struct v4l2_subdev *sd, u32 *lines)
685 {
686 struct i2c_client *client = sd->priv;
687 struct mt9m001 *mt9m001 = to_mt9m001(client);
688
689 *lines = mt9m001->y_skip_top;
690
691 return 0;
692 }
693
694 static struct v4l2_subdev_core_ops mt9m001_subdev_core_ops = {
695 .g_ctrl = mt9m001_g_ctrl,
696 .s_ctrl = mt9m001_s_ctrl,
697 .g_chip_ident = mt9m001_g_chip_ident,
698 #ifdef CONFIG_VIDEO_ADV_DEBUG
699 .g_register = mt9m001_g_register,
700 .s_register = mt9m001_s_register,
701 #endif
702 };
703
704 static int mt9m001_enum_fmt(struct v4l2_subdev *sd, int index,
705 enum v4l2_mbus_pixelcode *code)
706 {
707 struct i2c_client *client = sd->priv;
708 struct mt9m001 *mt9m001 = to_mt9m001(client);
709
710 if ((unsigned int)index >= mt9m001->num_fmts)
711 return -EINVAL;
712
713 *code = mt9m001->fmts[index].code;
714 return 0;
715 }
716
717 static struct v4l2_subdev_video_ops mt9m001_subdev_video_ops = {
718 .s_stream = mt9m001_s_stream,
719 .s_mbus_fmt = mt9m001_s_fmt,
720 .g_mbus_fmt = mt9m001_g_fmt,
721 .try_mbus_fmt = mt9m001_try_fmt,
722 .s_crop = mt9m001_s_crop,
723 .g_crop = mt9m001_g_crop,
724 .cropcap = mt9m001_cropcap,
725 .enum_mbus_fmt = mt9m001_enum_fmt,
726 };
727
728 static struct v4l2_subdev_sensor_ops mt9m001_subdev_sensor_ops = {
729 .g_skip_top_lines = mt9m001_g_skip_top_lines,
730 };
731
732 static struct v4l2_subdev_ops mt9m001_subdev_ops = {
733 .core = &mt9m001_subdev_core_ops,
734 .video = &mt9m001_subdev_video_ops,
735 .sensor = &mt9m001_subdev_sensor_ops,
736 };
737
738 static int mt9m001_probe(struct i2c_client *client,
739 const struct i2c_device_id *did)
740 {
741 struct mt9m001 *mt9m001;
742 struct soc_camera_device *icd = client->dev.platform_data;
743 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
744 struct soc_camera_link *icl;
745 int ret;
746
747 if (!icd) {
748 dev_err(&client->dev, "MT9M001: missing soc-camera data!\n");
749 return -EINVAL;
750 }
751
752 icl = to_soc_camera_link(icd);
753 if (!icl) {
754 dev_err(&client->dev, "MT9M001 driver needs platform data\n");
755 return -EINVAL;
756 }
757
758 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
759 dev_warn(&adapter->dev,
760 "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
761 return -EIO;
762 }
763
764 mt9m001 = kzalloc(sizeof(struct mt9m001), GFP_KERNEL);
765 if (!mt9m001)
766 return -ENOMEM;
767
768 v4l2_i2c_subdev_init(&mt9m001->subdev, client, &mt9m001_subdev_ops);
769
770 /* Second stage probe - when a capture adapter is there */
771 icd->ops = &mt9m001_ops;
772
773 mt9m001->y_skip_top = 0;
774 mt9m001->rect.left = MT9M001_COLUMN_SKIP;
775 mt9m001->rect.top = MT9M001_ROW_SKIP;
776 mt9m001->rect.width = MT9M001_MAX_WIDTH;
777 mt9m001->rect.height = MT9M001_MAX_HEIGHT;
778
779 /*
780 * Simulated autoexposure. If enabled, we calculate shutter width
781 * ourselves in the driver based on vertical blanking and frame width
782 */
783 mt9m001->autoexposure = 1;
784
785 ret = mt9m001_video_probe(icd, client);
786 if (ret) {
787 icd->ops = NULL;
788 i2c_set_clientdata(client, NULL);
789 kfree(mt9m001);
790 }
791
792 return ret;
793 }
794
795 static int mt9m001_remove(struct i2c_client *client)
796 {
797 struct mt9m001 *mt9m001 = to_mt9m001(client);
798 struct soc_camera_device *icd = client->dev.platform_data;
799
800 icd->ops = NULL;
801 mt9m001_video_remove(icd);
802 i2c_set_clientdata(client, NULL);
803 client->driver = NULL;
804 kfree(mt9m001);
805
806 return 0;
807 }
808
809 static const struct i2c_device_id mt9m001_id[] = {
810 { "mt9m001", 0 },
811 { }
812 };
813 MODULE_DEVICE_TABLE(i2c, mt9m001_id);
814
815 static struct i2c_driver mt9m001_i2c_driver = {
816 .driver = {
817 .name = "mt9m001",
818 },
819 .probe = mt9m001_probe,
820 .remove = mt9m001_remove,
821 .id_table = mt9m001_id,
822 };
823
824 static int __init mt9m001_mod_init(void)
825 {
826 return i2c_add_driver(&mt9m001_i2c_driver);
827 }
828
829 static void __exit mt9m001_mod_exit(void)
830 {
831 i2c_del_driver(&mt9m001_i2c_driver);
832 }
833
834 module_init(mt9m001_mod_init);
835 module_exit(mt9m001_mod_exit);
836
837 MODULE_DESCRIPTION("Micron MT9M001 Camera driver");
838 MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
839 MODULE_LICENSE("GPL");