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 */
mt9m001_find_datafmt(u32 code,const struct mt9m001_datafmt * fmt,int n)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
to_mt9m001(const struct i2c_client * client)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
reg_read(struct i2c_client * client,const u8 reg)110 static int reg_read(struct i2c_client *client, const u8 reg)
111 {
112 return i2c_smbus_read_word_swapped(client, reg);
113 }
114
reg_write(struct i2c_client * client,const u8 reg,const u16 data)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
reg_set(struct i2c_client * client,const u8 reg,const u16 data)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
reg_clear(struct i2c_client * client,const u8 reg,const u16 data)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
mt9m001_init(struct i2c_client * client)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
mt9m001_s_stream(struct v4l2_subdev * sd,int enable)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
mt9m001_s_crop(struct v4l2_subdev * sd,const struct v4l2_crop * a)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 .set_fmt(FORMAT_TRY).
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
mt9m001_g_crop(struct v4l2_subdev * sd,struct v4l2_crop * a)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
mt9m001_cropcap(struct v4l2_subdev * sd,struct v4l2_cropcap * a)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
mt9m001_get_fmt(struct v4l2_subdev * sd,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_format * format)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
mt9m001_s_fmt(struct v4l2_subdev * sd,struct v4l2_mbus_framefmt * mf)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
mt9m001_set_fmt(struct v4l2_subdev * sd,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_format * format)301 static int mt9m001_set_fmt(struct v4l2_subdev *sd,
302 struct v4l2_subdev_pad_config *cfg,
303 struct v4l2_subdev_format *format)
304 {
305 struct v4l2_mbus_framefmt *mf = &format->format;
306 struct i2c_client *client = v4l2_get_subdevdata(sd);
307 struct mt9m001 *mt9m001 = to_mt9m001(client);
308 const struct mt9m001_datafmt *fmt;
309
310 if (format->pad)
311 return -EINVAL;
312
313 v4l_bound_align_image(&mf->width, MT9M001_MIN_WIDTH,
314 MT9M001_MAX_WIDTH, 1,
315 &mf->height, MT9M001_MIN_HEIGHT + mt9m001->y_skip_top,
316 MT9M001_MAX_HEIGHT + mt9m001->y_skip_top, 0, 0);
317
318 if (mt9m001->fmts == mt9m001_colour_fmts)
319 mf->height = ALIGN(mf->height - 1, 2);
320
321 fmt = mt9m001_find_datafmt(mf->code, mt9m001->fmts,
322 mt9m001->num_fmts);
323 if (!fmt) {
324 fmt = mt9m001->fmt;
325 mf->code = fmt->code;
326 }
327
328 mf->colorspace = fmt->colorspace;
329
330 if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE)
331 return mt9m001_s_fmt(sd, mf);
332 cfg->try_fmt = *mf;
333 return 0;
334 }
335
336 #ifdef CONFIG_VIDEO_ADV_DEBUG
mt9m001_g_register(struct v4l2_subdev * sd,struct v4l2_dbg_register * reg)337 static int mt9m001_g_register(struct v4l2_subdev *sd,
338 struct v4l2_dbg_register *reg)
339 {
340 struct i2c_client *client = v4l2_get_subdevdata(sd);
341
342 if (reg->reg > 0xff)
343 return -EINVAL;
344
345 reg->size = 2;
346 reg->val = reg_read(client, reg->reg);
347
348 if (reg->val > 0xffff)
349 return -EIO;
350
351 return 0;
352 }
353
mt9m001_s_register(struct v4l2_subdev * sd,const struct v4l2_dbg_register * reg)354 static int mt9m001_s_register(struct v4l2_subdev *sd,
355 const struct v4l2_dbg_register *reg)
356 {
357 struct i2c_client *client = v4l2_get_subdevdata(sd);
358
359 if (reg->reg > 0xff)
360 return -EINVAL;
361
362 if (reg_write(client, reg->reg, reg->val) < 0)
363 return -EIO;
364
365 return 0;
366 }
367 #endif
368
mt9m001_s_power(struct v4l2_subdev * sd,int on)369 static int mt9m001_s_power(struct v4l2_subdev *sd, int on)
370 {
371 struct i2c_client *client = v4l2_get_subdevdata(sd);
372 struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client);
373 struct mt9m001 *mt9m001 = to_mt9m001(client);
374
375 return soc_camera_set_power(&client->dev, ssdd, mt9m001->clk, on);
376 }
377
mt9m001_g_volatile_ctrl(struct v4l2_ctrl * ctrl)378 static int mt9m001_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
379 {
380 struct mt9m001 *mt9m001 = container_of(ctrl->handler,
381 struct mt9m001, hdl);
382 s32 min, max;
383
384 switch (ctrl->id) {
385 case V4L2_CID_EXPOSURE_AUTO:
386 min = mt9m001->exposure->minimum;
387 max = mt9m001->exposure->maximum;
388 mt9m001->exposure->val =
389 (524 + (mt9m001->total_h - 1) * (max - min)) / 1048 + min;
390 break;
391 }
392 return 0;
393 }
394
mt9m001_s_ctrl(struct v4l2_ctrl * ctrl)395 static int mt9m001_s_ctrl(struct v4l2_ctrl *ctrl)
396 {
397 struct mt9m001 *mt9m001 = container_of(ctrl->handler,
398 struct mt9m001, hdl);
399 struct v4l2_subdev *sd = &mt9m001->subdev;
400 struct i2c_client *client = v4l2_get_subdevdata(sd);
401 struct v4l2_ctrl *exp = mt9m001->exposure;
402 int data;
403
404 switch (ctrl->id) {
405 case V4L2_CID_VFLIP:
406 if (ctrl->val)
407 data = reg_set(client, MT9M001_READ_OPTIONS2, 0x8000);
408 else
409 data = reg_clear(client, MT9M001_READ_OPTIONS2, 0x8000);
410 if (data < 0)
411 return -EIO;
412 return 0;
413
414 case V4L2_CID_GAIN:
415 /* See Datasheet Table 7, Gain settings. */
416 if (ctrl->val <= ctrl->default_value) {
417 /* Pack it into 0..1 step 0.125, register values 0..8 */
418 unsigned long range = ctrl->default_value - ctrl->minimum;
419 data = ((ctrl->val - (s32)ctrl->minimum) * 8 + range / 2) / range;
420
421 dev_dbg(&client->dev, "Setting gain %d\n", data);
422 data = reg_write(client, MT9M001_GLOBAL_GAIN, data);
423 if (data < 0)
424 return -EIO;
425 } else {
426 /* Pack it into 1.125..15 variable step, register values 9..67 */
427 /* We assume qctrl->maximum - qctrl->default_value - 1 > 0 */
428 unsigned long range = ctrl->maximum - ctrl->default_value - 1;
429 unsigned long gain = ((ctrl->val - (s32)ctrl->default_value - 1) *
430 111 + range / 2) / range + 9;
431
432 if (gain <= 32)
433 data = gain;
434 else if (gain <= 64)
435 data = ((gain - 32) * 16 + 16) / 32 + 80;
436 else
437 data = ((gain - 64) * 7 + 28) / 56 + 96;
438
439 dev_dbg(&client->dev, "Setting gain from %d to %d\n",
440 reg_read(client, MT9M001_GLOBAL_GAIN), data);
441 data = reg_write(client, MT9M001_GLOBAL_GAIN, data);
442 if (data < 0)
443 return -EIO;
444 }
445 return 0;
446
447 case V4L2_CID_EXPOSURE_AUTO:
448 if (ctrl->val == V4L2_EXPOSURE_MANUAL) {
449 unsigned long range = exp->maximum - exp->minimum;
450 unsigned long shutter = ((exp->val - (s32)exp->minimum) * 1048 +
451 range / 2) / range + 1;
452
453 dev_dbg(&client->dev,
454 "Setting shutter width from %d to %lu\n",
455 reg_read(client, MT9M001_SHUTTER_WIDTH), shutter);
456 if (reg_write(client, MT9M001_SHUTTER_WIDTH, shutter) < 0)
457 return -EIO;
458 } else {
459 const u16 vblank = 25;
460
461 mt9m001->total_h = mt9m001->rect.height +
462 mt9m001->y_skip_top + vblank;
463 if (reg_write(client, MT9M001_SHUTTER_WIDTH, mt9m001->total_h) < 0)
464 return -EIO;
465 }
466 return 0;
467 }
468 return -EINVAL;
469 }
470
471 /*
472 * Interface active, can use i2c. If it fails, it can indeed mean, that
473 * this wasn't our capture interface, so, we wait for the right one
474 */
mt9m001_video_probe(struct soc_camera_subdev_desc * ssdd,struct i2c_client * client)475 static int mt9m001_video_probe(struct soc_camera_subdev_desc *ssdd,
476 struct i2c_client *client)
477 {
478 struct mt9m001 *mt9m001 = to_mt9m001(client);
479 s32 data;
480 unsigned long flags;
481 int ret;
482
483 ret = mt9m001_s_power(&mt9m001->subdev, 1);
484 if (ret < 0)
485 return ret;
486
487 /* Enable the chip */
488 data = reg_write(client, MT9M001_CHIP_ENABLE, 1);
489 dev_dbg(&client->dev, "write: %d\n", data);
490
491 /* Read out the chip version register */
492 data = reg_read(client, MT9M001_CHIP_VERSION);
493
494 /* must be 0x8411 or 0x8421 for colour sensor and 8431 for bw */
495 switch (data) {
496 case 0x8411:
497 case 0x8421:
498 mt9m001->fmts = mt9m001_colour_fmts;
499 break;
500 case 0x8431:
501 mt9m001->fmts = mt9m001_monochrome_fmts;
502 break;
503 default:
504 dev_err(&client->dev,
505 "No MT9M001 chip detected, register read %x\n", data);
506 ret = -ENODEV;
507 goto done;
508 }
509
510 mt9m001->num_fmts = 0;
511
512 /*
513 * This is a 10bit sensor, so by default we only allow 10bit.
514 * The platform may support different bus widths due to
515 * different routing of the data lines.
516 */
517 if (ssdd->query_bus_param)
518 flags = ssdd->query_bus_param(ssdd);
519 else
520 flags = SOCAM_DATAWIDTH_10;
521
522 if (flags & SOCAM_DATAWIDTH_10)
523 mt9m001->num_fmts++;
524 else
525 mt9m001->fmts++;
526
527 if (flags & SOCAM_DATAWIDTH_8)
528 mt9m001->num_fmts++;
529
530 mt9m001->fmt = &mt9m001->fmts[0];
531
532 dev_info(&client->dev, "Detected a MT9M001 chip ID %x (%s)\n", data,
533 data == 0x8431 ? "C12STM" : "C12ST");
534
535 ret = mt9m001_init(client);
536 if (ret < 0) {
537 dev_err(&client->dev, "Failed to initialise the camera\n");
538 goto done;
539 }
540
541 /* mt9m001_init() has reset the chip, returning registers to defaults */
542 ret = v4l2_ctrl_handler_setup(&mt9m001->hdl);
543
544 done:
545 mt9m001_s_power(&mt9m001->subdev, 0);
546 return ret;
547 }
548
mt9m001_video_remove(struct soc_camera_subdev_desc * ssdd)549 static void mt9m001_video_remove(struct soc_camera_subdev_desc *ssdd)
550 {
551 if (ssdd->free_bus)
552 ssdd->free_bus(ssdd);
553 }
554
mt9m001_g_skip_top_lines(struct v4l2_subdev * sd,u32 * lines)555 static int mt9m001_g_skip_top_lines(struct v4l2_subdev *sd, u32 *lines)
556 {
557 struct i2c_client *client = v4l2_get_subdevdata(sd);
558 struct mt9m001 *mt9m001 = to_mt9m001(client);
559
560 *lines = mt9m001->y_skip_top;
561
562 return 0;
563 }
564
565 static const struct v4l2_ctrl_ops mt9m001_ctrl_ops = {
566 .g_volatile_ctrl = mt9m001_g_volatile_ctrl,
567 .s_ctrl = mt9m001_s_ctrl,
568 };
569
570 static struct v4l2_subdev_core_ops mt9m001_subdev_core_ops = {
571 #ifdef CONFIG_VIDEO_ADV_DEBUG
572 .g_register = mt9m001_g_register,
573 .s_register = mt9m001_s_register,
574 #endif
575 .s_power = mt9m001_s_power,
576 };
577
mt9m001_enum_mbus_code(struct v4l2_subdev * sd,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_mbus_code_enum * code)578 static int mt9m001_enum_mbus_code(struct v4l2_subdev *sd,
579 struct v4l2_subdev_pad_config *cfg,
580 struct v4l2_subdev_mbus_code_enum *code)
581 {
582 struct i2c_client *client = v4l2_get_subdevdata(sd);
583 struct mt9m001 *mt9m001 = to_mt9m001(client);
584
585 if (code->pad || code->index >= mt9m001->num_fmts)
586 return -EINVAL;
587
588 code->code = mt9m001->fmts[code->index].code;
589 return 0;
590 }
591
mt9m001_g_mbus_config(struct v4l2_subdev * sd,struct v4l2_mbus_config * cfg)592 static int mt9m001_g_mbus_config(struct v4l2_subdev *sd,
593 struct v4l2_mbus_config *cfg)
594 {
595 struct i2c_client *client = v4l2_get_subdevdata(sd);
596 struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client);
597
598 /* MT9M001 has all capture_format parameters fixed */
599 cfg->flags = V4L2_MBUS_PCLK_SAMPLE_FALLING |
600 V4L2_MBUS_HSYNC_ACTIVE_HIGH | V4L2_MBUS_VSYNC_ACTIVE_HIGH |
601 V4L2_MBUS_DATA_ACTIVE_HIGH | V4L2_MBUS_MASTER;
602 cfg->type = V4L2_MBUS_PARALLEL;
603 cfg->flags = soc_camera_apply_board_flags(ssdd, cfg);
604
605 return 0;
606 }
607
mt9m001_s_mbus_config(struct v4l2_subdev * sd,const struct v4l2_mbus_config * cfg)608 static int mt9m001_s_mbus_config(struct v4l2_subdev *sd,
609 const struct v4l2_mbus_config *cfg)
610 {
611 const struct i2c_client *client = v4l2_get_subdevdata(sd);
612 struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client);
613 struct mt9m001 *mt9m001 = to_mt9m001(client);
614 unsigned int bps = soc_mbus_get_fmtdesc(mt9m001->fmt->code)->bits_per_sample;
615
616 if (ssdd->set_bus_param)
617 return ssdd->set_bus_param(ssdd, 1 << (bps - 1));
618
619 /*
620 * Without board specific bus width settings we only support the
621 * sensors native bus width
622 */
623 return bps == 10 ? 0 : -EINVAL;
624 }
625
626 static struct v4l2_subdev_video_ops mt9m001_subdev_video_ops = {
627 .s_stream = mt9m001_s_stream,
628 .s_crop = mt9m001_s_crop,
629 .g_crop = mt9m001_g_crop,
630 .cropcap = mt9m001_cropcap,
631 .g_mbus_config = mt9m001_g_mbus_config,
632 .s_mbus_config = mt9m001_s_mbus_config,
633 };
634
635 static struct v4l2_subdev_sensor_ops mt9m001_subdev_sensor_ops = {
636 .g_skip_top_lines = mt9m001_g_skip_top_lines,
637 };
638
639 static const struct v4l2_subdev_pad_ops mt9m001_subdev_pad_ops = {
640 .enum_mbus_code = mt9m001_enum_mbus_code,
641 .get_fmt = mt9m001_get_fmt,
642 .set_fmt = mt9m001_set_fmt,
643 };
644
645 static struct v4l2_subdev_ops mt9m001_subdev_ops = {
646 .core = &mt9m001_subdev_core_ops,
647 .video = &mt9m001_subdev_video_ops,
648 .sensor = &mt9m001_subdev_sensor_ops,
649 .pad = &mt9m001_subdev_pad_ops,
650 };
651
mt9m001_probe(struct i2c_client * client,const struct i2c_device_id * did)652 static int mt9m001_probe(struct i2c_client *client,
653 const struct i2c_device_id *did)
654 {
655 struct mt9m001 *mt9m001;
656 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
657 struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client);
658 int ret;
659
660 if (!ssdd) {
661 dev_err(&client->dev, "MT9M001 driver needs platform data\n");
662 return -EINVAL;
663 }
664
665 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
666 dev_warn(&adapter->dev,
667 "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
668 return -EIO;
669 }
670
671 mt9m001 = devm_kzalloc(&client->dev, sizeof(struct mt9m001), GFP_KERNEL);
672 if (!mt9m001)
673 return -ENOMEM;
674
675 v4l2_i2c_subdev_init(&mt9m001->subdev, client, &mt9m001_subdev_ops);
676 v4l2_ctrl_handler_init(&mt9m001->hdl, 4);
677 v4l2_ctrl_new_std(&mt9m001->hdl, &mt9m001_ctrl_ops,
678 V4L2_CID_VFLIP, 0, 1, 1, 0);
679 v4l2_ctrl_new_std(&mt9m001->hdl, &mt9m001_ctrl_ops,
680 V4L2_CID_GAIN, 0, 127, 1, 64);
681 mt9m001->exposure = v4l2_ctrl_new_std(&mt9m001->hdl, &mt9m001_ctrl_ops,
682 V4L2_CID_EXPOSURE, 1, 255, 1, 255);
683 /*
684 * Simulated autoexposure. If enabled, we calculate shutter width
685 * ourselves in the driver based on vertical blanking and frame width
686 */
687 mt9m001->autoexposure = v4l2_ctrl_new_std_menu(&mt9m001->hdl,
688 &mt9m001_ctrl_ops, V4L2_CID_EXPOSURE_AUTO, 1, 0,
689 V4L2_EXPOSURE_AUTO);
690 mt9m001->subdev.ctrl_handler = &mt9m001->hdl;
691 if (mt9m001->hdl.error)
692 return mt9m001->hdl.error;
693
694 v4l2_ctrl_auto_cluster(2, &mt9m001->autoexposure,
695 V4L2_EXPOSURE_MANUAL, true);
696
697 /* Second stage probe - when a capture adapter is there */
698 mt9m001->y_skip_top = 0;
699 mt9m001->rect.left = MT9M001_COLUMN_SKIP;
700 mt9m001->rect.top = MT9M001_ROW_SKIP;
701 mt9m001->rect.width = MT9M001_MAX_WIDTH;
702 mt9m001->rect.height = MT9M001_MAX_HEIGHT;
703
704 mt9m001->clk = v4l2_clk_get(&client->dev, "mclk");
705 if (IS_ERR(mt9m001->clk)) {
706 ret = PTR_ERR(mt9m001->clk);
707 goto eclkget;
708 }
709
710 ret = mt9m001_video_probe(ssdd, client);
711 if (ret) {
712 v4l2_clk_put(mt9m001->clk);
713 eclkget:
714 v4l2_ctrl_handler_free(&mt9m001->hdl);
715 }
716
717 return ret;
718 }
719
mt9m001_remove(struct i2c_client * client)720 static int mt9m001_remove(struct i2c_client *client)
721 {
722 struct mt9m001 *mt9m001 = to_mt9m001(client);
723 struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client);
724
725 v4l2_clk_put(mt9m001->clk);
726 v4l2_device_unregister_subdev(&mt9m001->subdev);
727 v4l2_ctrl_handler_free(&mt9m001->hdl);
728 mt9m001_video_remove(ssdd);
729
730 return 0;
731 }
732
733 static const struct i2c_device_id mt9m001_id[] = {
734 { "mt9m001", 0 },
735 { }
736 };
737 MODULE_DEVICE_TABLE(i2c, mt9m001_id);
738
739 static struct i2c_driver mt9m001_i2c_driver = {
740 .driver = {
741 .name = "mt9m001",
742 },
743 .probe = mt9m001_probe,
744 .remove = mt9m001_remove,
745 .id_table = mt9m001_id,
746 };
747
748 module_i2c_driver(mt9m001_i2c_driver);
749
750 MODULE_DESCRIPTION("Micron MT9M001 Camera driver");
751 MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
752 MODULE_LICENSE("GPL");
753