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[deliverable/linux.git] / drivers / media / i2c / soc_camera / mt9m001.c
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 #include <linux/module.h>
16
17 #include <media/soc_camera.h>
18 #include <media/soc_mediabus.h>
19 #include <media/v4l2-clk.h>
20 #include <media/v4l2-subdev.h>
21 #include <media/v4l2-ctrls.h>
22
23 /*
24 * mt9m001 i2c address 0x5d
25 * The platform has to define struct i2c_board_info objects and link to them
26 * from struct soc_camera_host_desc
27 */
28
29 /* mt9m001 selected register addresses */
30 #define MT9M001_CHIP_VERSION 0x00
31 #define MT9M001_ROW_START 0x01
32 #define MT9M001_COLUMN_START 0x02
33 #define MT9M001_WINDOW_HEIGHT 0x03
34 #define MT9M001_WINDOW_WIDTH 0x04
35 #define MT9M001_HORIZONTAL_BLANKING 0x05
36 #define MT9M001_VERTICAL_BLANKING 0x06
37 #define MT9M001_OUTPUT_CONTROL 0x07
38 #define MT9M001_SHUTTER_WIDTH 0x09
39 #define MT9M001_FRAME_RESTART 0x0b
40 #define MT9M001_SHUTTER_DELAY 0x0c
41 #define MT9M001_RESET 0x0d
42 #define MT9M001_READ_OPTIONS1 0x1e
43 #define MT9M001_READ_OPTIONS2 0x20
44 #define MT9M001_GLOBAL_GAIN 0x35
45 #define MT9M001_CHIP_ENABLE 0xF1
46
47 #define MT9M001_MAX_WIDTH 1280
48 #define MT9M001_MAX_HEIGHT 1024
49 #define MT9M001_MIN_WIDTH 48
50 #define MT9M001_MIN_HEIGHT 32
51 #define MT9M001_COLUMN_SKIP 20
52 #define MT9M001_ROW_SKIP 12
53
54 /* MT9M001 has only one fixed colorspace per pixelcode */
55 struct mt9m001_datafmt {
56 u32 code;
57 enum v4l2_colorspace colorspace;
58 };
59
60 /* Find a data format by a pixel code in an array */
61 static const struct mt9m001_datafmt *mt9m001_find_datafmt(
62 u32 code, const struct mt9m001_datafmt *fmt,
63 int n)
64 {
65 int i;
66 for (i = 0; i < n; i++)
67 if (fmt[i].code == code)
68 return fmt + i;
69
70 return NULL;
71 }
72
73 static const struct mt9m001_datafmt mt9m001_colour_fmts[] = {
74 /*
75 * Order important: first natively supported,
76 * second supported with a GPIO extender
77 */
78 {MEDIA_BUS_FMT_SBGGR10_1X10, V4L2_COLORSPACE_SRGB},
79 {MEDIA_BUS_FMT_SBGGR8_1X8, V4L2_COLORSPACE_SRGB},
80 };
81
82 static const struct mt9m001_datafmt mt9m001_monochrome_fmts[] = {
83 /* Order important - see above */
84 {MEDIA_BUS_FMT_Y10_1X10, V4L2_COLORSPACE_JPEG},
85 {MEDIA_BUS_FMT_Y8_1X8, V4L2_COLORSPACE_JPEG},
86 };
87
88 struct mt9m001 {
89 struct v4l2_subdev subdev;
90 struct v4l2_ctrl_handler hdl;
91 struct {
92 /* exposure/auto-exposure cluster */
93 struct v4l2_ctrl *autoexposure;
94 struct v4l2_ctrl *exposure;
95 };
96 struct v4l2_rect rect; /* Sensor window */
97 struct v4l2_clk *clk;
98 const struct mt9m001_datafmt *fmt;
99 const struct mt9m001_datafmt *fmts;
100 int num_fmts;
101 unsigned int total_h;
102 unsigned short y_skip_top; /* Lines to skip at the top */
103 };
104
105 static struct mt9m001 *to_mt9m001(const struct i2c_client *client)
106 {
107 return container_of(i2c_get_clientdata(client), struct mt9m001, subdev);
108 }
109
110 static int reg_read(struct i2c_client *client, const u8 reg)
111 {
112 return i2c_smbus_read_word_swapped(client, reg);
113 }
114
115 static int reg_write(struct i2c_client *client, const u8 reg,
116 const u16 data)
117 {
118 return i2c_smbus_write_word_swapped(client, reg, data);
119 }
120
121 static int reg_set(struct i2c_client *client, const u8 reg,
122 const u16 data)
123 {
124 int ret;
125
126 ret = reg_read(client, reg);
127 if (ret < 0)
128 return ret;
129 return reg_write(client, reg, ret | data);
130 }
131
132 static int reg_clear(struct i2c_client *client, const u8 reg,
133 const u16 data)
134 {
135 int ret;
136
137 ret = reg_read(client, reg);
138 if (ret < 0)
139 return ret;
140 return reg_write(client, reg, ret & ~data);
141 }
142
143 static int mt9m001_init(struct i2c_client *client)
144 {
145 int ret;
146
147 dev_dbg(&client->dev, "%s\n", __func__);
148
149 /*
150 * We don't know, whether platform provides reset, issue a soft reset
151 * too. This returns all registers to their default values.
152 */
153 ret = reg_write(client, MT9M001_RESET, 1);
154 if (!ret)
155 ret = reg_write(client, MT9M001_RESET, 0);
156
157 /* Disable chip, synchronous option update */
158 if (!ret)
159 ret = reg_write(client, MT9M001_OUTPUT_CONTROL, 0);
160
161 return ret;
162 }
163
164 static int mt9m001_s_stream(struct v4l2_subdev *sd, int enable)
165 {
166 struct i2c_client *client = v4l2_get_subdevdata(sd);
167
168 /* Switch to master "normal" mode or stop sensor readout */
169 if (reg_write(client, MT9M001_OUTPUT_CONTROL, enable ? 2 : 0) < 0)
170 return -EIO;
171 return 0;
172 }
173
174 static int mt9m001_s_crop(struct v4l2_subdev *sd, const struct v4l2_crop *a)
175 {
176 struct i2c_client *client = v4l2_get_subdevdata(sd);
177 struct mt9m001 *mt9m001 = to_mt9m001(client);
178 struct v4l2_rect rect = a->c;
179 int ret;
180 const u16 hblank = 9, vblank = 25;
181
182 if (mt9m001->fmts == mt9m001_colour_fmts)
183 /*
184 * Bayer format - even number of rows for simplicity,
185 * but let the user play with the top row.
186 */
187 rect.height = ALIGN(rect.height, 2);
188
189 /* Datasheet requirement: see register description */
190 rect.width = ALIGN(rect.width, 2);
191 rect.left = ALIGN(rect.left, 2);
192
193 soc_camera_limit_side(&rect.left, &rect.width,
194 MT9M001_COLUMN_SKIP, MT9M001_MIN_WIDTH, MT9M001_MAX_WIDTH);
195
196 soc_camera_limit_side(&rect.top, &rect.height,
197 MT9M001_ROW_SKIP, MT9M001_MIN_HEIGHT, MT9M001_MAX_HEIGHT);
198
199 mt9m001->total_h = rect.height + mt9m001->y_skip_top + vblank;
200
201 /* Blanking and start values - default... */
202 ret = reg_write(client, MT9M001_HORIZONTAL_BLANKING, hblank);
203 if (!ret)
204 ret = reg_write(client, MT9M001_VERTICAL_BLANKING, vblank);
205
206 /*
207 * The caller provides a supported format, as verified per
208 * call to .try_mbus_fmt()
209 */
210 if (!ret)
211 ret = reg_write(client, MT9M001_COLUMN_START, rect.left);
212 if (!ret)
213 ret = reg_write(client, MT9M001_ROW_START, rect.top);
214 if (!ret)
215 ret = reg_write(client, MT9M001_WINDOW_WIDTH, rect.width - 1);
216 if (!ret)
217 ret = reg_write(client, MT9M001_WINDOW_HEIGHT,
218 rect.height + mt9m001->y_skip_top - 1);
219 if (!ret && v4l2_ctrl_g_ctrl(mt9m001->autoexposure) == V4L2_EXPOSURE_AUTO)
220 ret = reg_write(client, MT9M001_SHUTTER_WIDTH, mt9m001->total_h);
221
222 if (!ret)
223 mt9m001->rect = rect;
224
225 return ret;
226 }
227
228 static int mt9m001_g_crop(struct v4l2_subdev *sd, struct v4l2_crop *a)
229 {
230 struct i2c_client *client = v4l2_get_subdevdata(sd);
231 struct mt9m001 *mt9m001 = to_mt9m001(client);
232
233 a->c = mt9m001->rect;
234 a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
235
236 return 0;
237 }
238
239 static int mt9m001_cropcap(struct v4l2_subdev *sd, struct v4l2_cropcap *a)
240 {
241 a->bounds.left = MT9M001_COLUMN_SKIP;
242 a->bounds.top = MT9M001_ROW_SKIP;
243 a->bounds.width = MT9M001_MAX_WIDTH;
244 a->bounds.height = MT9M001_MAX_HEIGHT;
245 a->defrect = a->bounds;
246 a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
247 a->pixelaspect.numerator = 1;
248 a->pixelaspect.denominator = 1;
249
250 return 0;
251 }
252
253 static int mt9m001_get_fmt(struct v4l2_subdev *sd,
254 struct v4l2_subdev_pad_config *cfg,
255 struct v4l2_subdev_format *format)
256 {
257 struct i2c_client *client = v4l2_get_subdevdata(sd);
258 struct mt9m001 *mt9m001 = to_mt9m001(client);
259 struct v4l2_mbus_framefmt *mf = &format->format;
260
261 if (format->pad)
262 return -EINVAL;
263
264 mf->width = mt9m001->rect.width;
265 mf->height = mt9m001->rect.height;
266 mf->code = mt9m001->fmt->code;
267 mf->colorspace = mt9m001->fmt->colorspace;
268 mf->field = V4L2_FIELD_NONE;
269
270 return 0;
271 }
272
273 static int mt9m001_s_fmt(struct v4l2_subdev *sd,
274 struct v4l2_mbus_framefmt *mf)
275 {
276 struct i2c_client *client = v4l2_get_subdevdata(sd);
277 struct mt9m001 *mt9m001 = to_mt9m001(client);
278 struct v4l2_crop a = {
279 .c = {
280 .left = mt9m001->rect.left,
281 .top = mt9m001->rect.top,
282 .width = mf->width,
283 .height = mf->height,
284 },
285 };
286 int ret;
287
288 /* No support for scaling so far, just crop. TODO: use skipping */
289 ret = mt9m001_s_crop(sd, &a);
290 if (!ret) {
291 mf->width = mt9m001->rect.width;
292 mf->height = mt9m001->rect.height;
293 mt9m001->fmt = mt9m001_find_datafmt(mf->code,
294 mt9m001->fmts, mt9m001->num_fmts);
295 mf->colorspace = mt9m001->fmt->colorspace;
296 }
297
298 return ret;
299 }
300
301 static int mt9m001_try_fmt(struct v4l2_subdev *sd,
302 struct v4l2_mbus_framefmt *mf)
303 {
304 struct i2c_client *client = v4l2_get_subdevdata(sd);
305 struct mt9m001 *mt9m001 = to_mt9m001(client);
306 const struct mt9m001_datafmt *fmt;
307
308 v4l_bound_align_image(&mf->width, MT9M001_MIN_WIDTH,
309 MT9M001_MAX_WIDTH, 1,
310 &mf->height, MT9M001_MIN_HEIGHT + mt9m001->y_skip_top,
311 MT9M001_MAX_HEIGHT + mt9m001->y_skip_top, 0, 0);
312
313 if (mt9m001->fmts == mt9m001_colour_fmts)
314 mf->height = ALIGN(mf->height - 1, 2);
315
316 fmt = mt9m001_find_datafmt(mf->code, mt9m001->fmts,
317 mt9m001->num_fmts);
318 if (!fmt) {
319 fmt = mt9m001->fmt;
320 mf->code = fmt->code;
321 }
322
323 mf->colorspace = fmt->colorspace;
324
325 return 0;
326 }
327
328 #ifdef CONFIG_VIDEO_ADV_DEBUG
329 static int mt9m001_g_register(struct v4l2_subdev *sd,
330 struct v4l2_dbg_register *reg)
331 {
332 struct i2c_client *client = v4l2_get_subdevdata(sd);
333
334 if (reg->reg > 0xff)
335 return -EINVAL;
336
337 reg->size = 2;
338 reg->val = reg_read(client, reg->reg);
339
340 if (reg->val > 0xffff)
341 return -EIO;
342
343 return 0;
344 }
345
346 static int mt9m001_s_register(struct v4l2_subdev *sd,
347 const struct v4l2_dbg_register *reg)
348 {
349 struct i2c_client *client = v4l2_get_subdevdata(sd);
350
351 if (reg->reg > 0xff)
352 return -EINVAL;
353
354 if (reg_write(client, reg->reg, reg->val) < 0)
355 return -EIO;
356
357 return 0;
358 }
359 #endif
360
361 static int mt9m001_s_power(struct v4l2_subdev *sd, int on)
362 {
363 struct i2c_client *client = v4l2_get_subdevdata(sd);
364 struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client);
365 struct mt9m001 *mt9m001 = to_mt9m001(client);
366
367 return soc_camera_set_power(&client->dev, ssdd, mt9m001->clk, on);
368 }
369
370 static int mt9m001_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
371 {
372 struct mt9m001 *mt9m001 = container_of(ctrl->handler,
373 struct mt9m001, hdl);
374 s32 min, max;
375
376 switch (ctrl->id) {
377 case V4L2_CID_EXPOSURE_AUTO:
378 min = mt9m001->exposure->minimum;
379 max = mt9m001->exposure->maximum;
380 mt9m001->exposure->val =
381 (524 + (mt9m001->total_h - 1) * (max - min)) / 1048 + min;
382 break;
383 }
384 return 0;
385 }
386
387 static int mt9m001_s_ctrl(struct v4l2_ctrl *ctrl)
388 {
389 struct mt9m001 *mt9m001 = container_of(ctrl->handler,
390 struct mt9m001, hdl);
391 struct v4l2_subdev *sd = &mt9m001->subdev;
392 struct i2c_client *client = v4l2_get_subdevdata(sd);
393 struct v4l2_ctrl *exp = mt9m001->exposure;
394 int data;
395
396 switch (ctrl->id) {
397 case V4L2_CID_VFLIP:
398 if (ctrl->val)
399 data = reg_set(client, MT9M001_READ_OPTIONS2, 0x8000);
400 else
401 data = reg_clear(client, MT9M001_READ_OPTIONS2, 0x8000);
402 if (data < 0)
403 return -EIO;
404 return 0;
405
406 case V4L2_CID_GAIN:
407 /* See Datasheet Table 7, Gain settings. */
408 if (ctrl->val <= ctrl->default_value) {
409 /* Pack it into 0..1 step 0.125, register values 0..8 */
410 unsigned long range = ctrl->default_value - ctrl->minimum;
411 data = ((ctrl->val - (s32)ctrl->minimum) * 8 + range / 2) / range;
412
413 dev_dbg(&client->dev, "Setting gain %d\n", data);
414 data = reg_write(client, MT9M001_GLOBAL_GAIN, data);
415 if (data < 0)
416 return -EIO;
417 } else {
418 /* Pack it into 1.125..15 variable step, register values 9..67 */
419 /* We assume qctrl->maximum - qctrl->default_value - 1 > 0 */
420 unsigned long range = ctrl->maximum - ctrl->default_value - 1;
421 unsigned long gain = ((ctrl->val - (s32)ctrl->default_value - 1) *
422 111 + range / 2) / range + 9;
423
424 if (gain <= 32)
425 data = gain;
426 else if (gain <= 64)
427 data = ((gain - 32) * 16 + 16) / 32 + 80;
428 else
429 data = ((gain - 64) * 7 + 28) / 56 + 96;
430
431 dev_dbg(&client->dev, "Setting gain from %d to %d\n",
432 reg_read(client, MT9M001_GLOBAL_GAIN), data);
433 data = reg_write(client, MT9M001_GLOBAL_GAIN, data);
434 if (data < 0)
435 return -EIO;
436 }
437 return 0;
438
439 case V4L2_CID_EXPOSURE_AUTO:
440 if (ctrl->val == V4L2_EXPOSURE_MANUAL) {
441 unsigned long range = exp->maximum - exp->minimum;
442 unsigned long shutter = ((exp->val - (s32)exp->minimum) * 1048 +
443 range / 2) / range + 1;
444
445 dev_dbg(&client->dev,
446 "Setting shutter width from %d to %lu\n",
447 reg_read(client, MT9M001_SHUTTER_WIDTH), shutter);
448 if (reg_write(client, MT9M001_SHUTTER_WIDTH, shutter) < 0)
449 return -EIO;
450 } else {
451 const u16 vblank = 25;
452
453 mt9m001->total_h = mt9m001->rect.height +
454 mt9m001->y_skip_top + vblank;
455 if (reg_write(client, MT9M001_SHUTTER_WIDTH, mt9m001->total_h) < 0)
456 return -EIO;
457 }
458 return 0;
459 }
460 return -EINVAL;
461 }
462
463 /*
464 * Interface active, can use i2c. If it fails, it can indeed mean, that
465 * this wasn't our capture interface, so, we wait for the right one
466 */
467 static int mt9m001_video_probe(struct soc_camera_subdev_desc *ssdd,
468 struct i2c_client *client)
469 {
470 struct mt9m001 *mt9m001 = to_mt9m001(client);
471 s32 data;
472 unsigned long flags;
473 int ret;
474
475 ret = mt9m001_s_power(&mt9m001->subdev, 1);
476 if (ret < 0)
477 return ret;
478
479 /* Enable the chip */
480 data = reg_write(client, MT9M001_CHIP_ENABLE, 1);
481 dev_dbg(&client->dev, "write: %d\n", data);
482
483 /* Read out the chip version register */
484 data = reg_read(client, MT9M001_CHIP_VERSION);
485
486 /* must be 0x8411 or 0x8421 for colour sensor and 8431 for bw */
487 switch (data) {
488 case 0x8411:
489 case 0x8421:
490 mt9m001->fmts = mt9m001_colour_fmts;
491 break;
492 case 0x8431:
493 mt9m001->fmts = mt9m001_monochrome_fmts;
494 break;
495 default:
496 dev_err(&client->dev,
497 "No MT9M001 chip detected, register read %x\n", data);
498 ret = -ENODEV;
499 goto done;
500 }
501
502 mt9m001->num_fmts = 0;
503
504 /*
505 * This is a 10bit sensor, so by default we only allow 10bit.
506 * The platform may support different bus widths due to
507 * different routing of the data lines.
508 */
509 if (ssdd->query_bus_param)
510 flags = ssdd->query_bus_param(ssdd);
511 else
512 flags = SOCAM_DATAWIDTH_10;
513
514 if (flags & SOCAM_DATAWIDTH_10)
515 mt9m001->num_fmts++;
516 else
517 mt9m001->fmts++;
518
519 if (flags & SOCAM_DATAWIDTH_8)
520 mt9m001->num_fmts++;
521
522 mt9m001->fmt = &mt9m001->fmts[0];
523
524 dev_info(&client->dev, "Detected a MT9M001 chip ID %x (%s)\n", data,
525 data == 0x8431 ? "C12STM" : "C12ST");
526
527 ret = mt9m001_init(client);
528 if (ret < 0) {
529 dev_err(&client->dev, "Failed to initialise the camera\n");
530 goto done;
531 }
532
533 /* mt9m001_init() has reset the chip, returning registers to defaults */
534 ret = v4l2_ctrl_handler_setup(&mt9m001->hdl);
535
536 done:
537 mt9m001_s_power(&mt9m001->subdev, 0);
538 return ret;
539 }
540
541 static void mt9m001_video_remove(struct soc_camera_subdev_desc *ssdd)
542 {
543 if (ssdd->free_bus)
544 ssdd->free_bus(ssdd);
545 }
546
547 static int mt9m001_g_skip_top_lines(struct v4l2_subdev *sd, u32 *lines)
548 {
549 struct i2c_client *client = v4l2_get_subdevdata(sd);
550 struct mt9m001 *mt9m001 = to_mt9m001(client);
551
552 *lines = mt9m001->y_skip_top;
553
554 return 0;
555 }
556
557 static const struct v4l2_ctrl_ops mt9m001_ctrl_ops = {
558 .g_volatile_ctrl = mt9m001_g_volatile_ctrl,
559 .s_ctrl = mt9m001_s_ctrl,
560 };
561
562 static struct v4l2_subdev_core_ops mt9m001_subdev_core_ops = {
563 #ifdef CONFIG_VIDEO_ADV_DEBUG
564 .g_register = mt9m001_g_register,
565 .s_register = mt9m001_s_register,
566 #endif
567 .s_power = mt9m001_s_power,
568 };
569
570 static int mt9m001_enum_mbus_code(struct v4l2_subdev *sd,
571 struct v4l2_subdev_pad_config *cfg,
572 struct v4l2_subdev_mbus_code_enum *code)
573 {
574 struct i2c_client *client = v4l2_get_subdevdata(sd);
575 struct mt9m001 *mt9m001 = to_mt9m001(client);
576
577 if (code->pad || code->index >= mt9m001->num_fmts)
578 return -EINVAL;
579
580 code->code = mt9m001->fmts[code->index].code;
581 return 0;
582 }
583
584 static int mt9m001_g_mbus_config(struct v4l2_subdev *sd,
585 struct v4l2_mbus_config *cfg)
586 {
587 struct i2c_client *client = v4l2_get_subdevdata(sd);
588 struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client);
589
590 /* MT9M001 has all capture_format parameters fixed */
591 cfg->flags = V4L2_MBUS_PCLK_SAMPLE_FALLING |
592 V4L2_MBUS_HSYNC_ACTIVE_HIGH | V4L2_MBUS_VSYNC_ACTIVE_HIGH |
593 V4L2_MBUS_DATA_ACTIVE_HIGH | V4L2_MBUS_MASTER;
594 cfg->type = V4L2_MBUS_PARALLEL;
595 cfg->flags = soc_camera_apply_board_flags(ssdd, cfg);
596
597 return 0;
598 }
599
600 static int mt9m001_s_mbus_config(struct v4l2_subdev *sd,
601 const struct v4l2_mbus_config *cfg)
602 {
603 const struct i2c_client *client = v4l2_get_subdevdata(sd);
604 struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client);
605 struct mt9m001 *mt9m001 = to_mt9m001(client);
606 unsigned int bps = soc_mbus_get_fmtdesc(mt9m001->fmt->code)->bits_per_sample;
607
608 if (ssdd->set_bus_param)
609 return ssdd->set_bus_param(ssdd, 1 << (bps - 1));
610
611 /*
612 * Without board specific bus width settings we only support the
613 * sensors native bus width
614 */
615 return bps == 10 ? 0 : -EINVAL;
616 }
617
618 static struct v4l2_subdev_video_ops mt9m001_subdev_video_ops = {
619 .s_stream = mt9m001_s_stream,
620 .s_mbus_fmt = mt9m001_s_fmt,
621 .try_mbus_fmt = mt9m001_try_fmt,
622 .s_crop = mt9m001_s_crop,
623 .g_crop = mt9m001_g_crop,
624 .cropcap = mt9m001_cropcap,
625 .g_mbus_config = mt9m001_g_mbus_config,
626 .s_mbus_config = mt9m001_s_mbus_config,
627 };
628
629 static struct v4l2_subdev_sensor_ops mt9m001_subdev_sensor_ops = {
630 .g_skip_top_lines = mt9m001_g_skip_top_lines,
631 };
632
633 static const struct v4l2_subdev_pad_ops mt9m001_subdev_pad_ops = {
634 .enum_mbus_code = mt9m001_enum_mbus_code,
635 .get_fmt = mt9m001_get_fmt,
636 };
637
638 static struct v4l2_subdev_ops mt9m001_subdev_ops = {
639 .core = &mt9m001_subdev_core_ops,
640 .video = &mt9m001_subdev_video_ops,
641 .sensor = &mt9m001_subdev_sensor_ops,
642 .pad = &mt9m001_subdev_pad_ops,
643 };
644
645 static int mt9m001_probe(struct i2c_client *client,
646 const struct i2c_device_id *did)
647 {
648 struct mt9m001 *mt9m001;
649 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
650 struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client);
651 int ret;
652
653 if (!ssdd) {
654 dev_err(&client->dev, "MT9M001 driver needs platform data\n");
655 return -EINVAL;
656 }
657
658 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
659 dev_warn(&adapter->dev,
660 "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
661 return -EIO;
662 }
663
664 mt9m001 = devm_kzalloc(&client->dev, sizeof(struct mt9m001), GFP_KERNEL);
665 if (!mt9m001)
666 return -ENOMEM;
667
668 v4l2_i2c_subdev_init(&mt9m001->subdev, client, &mt9m001_subdev_ops);
669 v4l2_ctrl_handler_init(&mt9m001->hdl, 4);
670 v4l2_ctrl_new_std(&mt9m001->hdl, &mt9m001_ctrl_ops,
671 V4L2_CID_VFLIP, 0, 1, 1, 0);
672 v4l2_ctrl_new_std(&mt9m001->hdl, &mt9m001_ctrl_ops,
673 V4L2_CID_GAIN, 0, 127, 1, 64);
674 mt9m001->exposure = v4l2_ctrl_new_std(&mt9m001->hdl, &mt9m001_ctrl_ops,
675 V4L2_CID_EXPOSURE, 1, 255, 1, 255);
676 /*
677 * Simulated autoexposure. If enabled, we calculate shutter width
678 * ourselves in the driver based on vertical blanking and frame width
679 */
680 mt9m001->autoexposure = v4l2_ctrl_new_std_menu(&mt9m001->hdl,
681 &mt9m001_ctrl_ops, V4L2_CID_EXPOSURE_AUTO, 1, 0,
682 V4L2_EXPOSURE_AUTO);
683 mt9m001->subdev.ctrl_handler = &mt9m001->hdl;
684 if (mt9m001->hdl.error)
685 return mt9m001->hdl.error;
686
687 v4l2_ctrl_auto_cluster(2, &mt9m001->autoexposure,
688 V4L2_EXPOSURE_MANUAL, true);
689
690 /* Second stage probe - when a capture adapter is there */
691 mt9m001->y_skip_top = 0;
692 mt9m001->rect.left = MT9M001_COLUMN_SKIP;
693 mt9m001->rect.top = MT9M001_ROW_SKIP;
694 mt9m001->rect.width = MT9M001_MAX_WIDTH;
695 mt9m001->rect.height = MT9M001_MAX_HEIGHT;
696
697 mt9m001->clk = v4l2_clk_get(&client->dev, "mclk");
698 if (IS_ERR(mt9m001->clk)) {
699 ret = PTR_ERR(mt9m001->clk);
700 goto eclkget;
701 }
702
703 ret = mt9m001_video_probe(ssdd, client);
704 if (ret) {
705 v4l2_clk_put(mt9m001->clk);
706 eclkget:
707 v4l2_ctrl_handler_free(&mt9m001->hdl);
708 }
709
710 return ret;
711 }
712
713 static int mt9m001_remove(struct i2c_client *client)
714 {
715 struct mt9m001 *mt9m001 = to_mt9m001(client);
716 struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client);
717
718 v4l2_clk_put(mt9m001->clk);
719 v4l2_device_unregister_subdev(&mt9m001->subdev);
720 v4l2_ctrl_handler_free(&mt9m001->hdl);
721 mt9m001_video_remove(ssdd);
722
723 return 0;
724 }
725
726 static const struct i2c_device_id mt9m001_id[] = {
727 { "mt9m001", 0 },
728 { }
729 };
730 MODULE_DEVICE_TABLE(i2c, mt9m001_id);
731
732 static struct i2c_driver mt9m001_i2c_driver = {
733 .driver = {
734 .name = "mt9m001",
735 },
736 .probe = mt9m001_probe,
737 .remove = mt9m001_remove,
738 .id_table = mt9m001_id,
739 };
740
741 module_i2c_driver(mt9m001_i2c_driver);
742
743 MODULE_DESCRIPTION("Micron MT9M001 Camera driver");
744 MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
745 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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