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-subdev.h>
20 #include <media/v4l2-chip-ident.h>
21 #include <media/v4l2-ctrls.h>
22
23 /*
24 * mt9m001 i2c address 0x5d
25 * The platform has to define ctruct i2c_board_info objects and link to them
26 * from struct soc_camera_link
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 enum v4l2_mbus_pixelcode code;
57 enum v4l2_colorspace colorspace;
58 };
59
60 /* Find a data format by a pixel code in an array */
mt9m001_find_datafmt(enum v4l2_mbus_pixelcode code,const struct mt9m001_datafmt * fmt,int n)61 static const struct mt9m001_datafmt *mt9m001_find_datafmt(
62 enum v4l2_mbus_pixelcode 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 {V4L2_MBUS_FMT_SBGGR10_1X10, V4L2_COLORSPACE_SRGB},
79 {V4L2_MBUS_FMT_SBGGR8_1X8, V4L2_COLORSPACE_SRGB},
80 };
81
82 static const struct mt9m001_datafmt mt9m001_monochrome_fmts[] = {
83 /* Order important - see above */
84 {V4L2_MBUS_FMT_Y10_1X10, V4L2_COLORSPACE_JPEG},
85 {V4L2_MBUS_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 const struct mt9m001_datafmt *fmt;
98 const struct mt9m001_datafmt *fmts;
99 int num_fmts;
100 int model; /* V4L2_IDENT_MT9M001* codes from v4l2-chip-ident.h */
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,struct v4l2_crop * a)174 static int mt9m001_s_crop(struct v4l2_subdev *sd, 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
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_g_fmt(struct v4l2_subdev * sd,struct v4l2_mbus_framefmt * mf)253 static int mt9m001_g_fmt(struct v4l2_subdev *sd,
254 struct v4l2_mbus_framefmt *mf)
255 {
256 struct i2c_client *client = v4l2_get_subdevdata(sd);
257 struct mt9m001 *mt9m001 = to_mt9m001(client);
258
259 mf->width = mt9m001->rect.width;
260 mf->height = mt9m001->rect.height;
261 mf->code = mt9m001->fmt->code;
262 mf->colorspace = mt9m001->fmt->colorspace;
263 mf->field = V4L2_FIELD_NONE;
264
265 return 0;
266 }
267
mt9m001_s_fmt(struct v4l2_subdev * sd,struct v4l2_mbus_framefmt * mf)268 static int mt9m001_s_fmt(struct v4l2_subdev *sd,
269 struct v4l2_mbus_framefmt *mf)
270 {
271 struct i2c_client *client = v4l2_get_subdevdata(sd);
272 struct mt9m001 *mt9m001 = to_mt9m001(client);
273 struct v4l2_crop a = {
274 .c = {
275 .left = mt9m001->rect.left,
276 .top = mt9m001->rect.top,
277 .width = mf->width,
278 .height = mf->height,
279 },
280 };
281 int ret;
282
283 /* No support for scaling so far, just crop. TODO: use skipping */
284 ret = mt9m001_s_crop(sd, &a);
285 if (!ret) {
286 mf->width = mt9m001->rect.width;
287 mf->height = mt9m001->rect.height;
288 mt9m001->fmt = mt9m001_find_datafmt(mf->code,
289 mt9m001->fmts, mt9m001->num_fmts);
290 mf->colorspace = mt9m001->fmt->colorspace;
291 }
292
293 return ret;
294 }
295
mt9m001_try_fmt(struct v4l2_subdev * sd,struct v4l2_mbus_framefmt * mf)296 static int mt9m001_try_fmt(struct v4l2_subdev *sd,
297 struct v4l2_mbus_framefmt *mf)
298 {
299 struct i2c_client *client = v4l2_get_subdevdata(sd);
300 struct mt9m001 *mt9m001 = to_mt9m001(client);
301 const struct mt9m001_datafmt *fmt;
302
303 v4l_bound_align_image(&mf->width, MT9M001_MIN_WIDTH,
304 MT9M001_MAX_WIDTH, 1,
305 &mf->height, MT9M001_MIN_HEIGHT + mt9m001->y_skip_top,
306 MT9M001_MAX_HEIGHT + mt9m001->y_skip_top, 0, 0);
307
308 if (mt9m001->fmts == mt9m001_colour_fmts)
309 mf->height = ALIGN(mf->height - 1, 2);
310
311 fmt = mt9m001_find_datafmt(mf->code, mt9m001->fmts,
312 mt9m001->num_fmts);
313 if (!fmt) {
314 fmt = mt9m001->fmt;
315 mf->code = fmt->code;
316 }
317
318 mf->colorspace = fmt->colorspace;
319
320 return 0;
321 }
322
mt9m001_g_chip_ident(struct v4l2_subdev * sd,struct v4l2_dbg_chip_ident * id)323 static int mt9m001_g_chip_ident(struct v4l2_subdev *sd,
324 struct v4l2_dbg_chip_ident *id)
325 {
326 struct i2c_client *client = v4l2_get_subdevdata(sd);
327 struct mt9m001 *mt9m001 = to_mt9m001(client);
328
329 if (id->match.type != V4L2_CHIP_MATCH_I2C_ADDR)
330 return -EINVAL;
331
332 if (id->match.addr != client->addr)
333 return -ENODEV;
334
335 id->ident = mt9m001->model;
336 id->revision = 0;
337
338 return 0;
339 }
340
341 #ifdef CONFIG_VIDEO_ADV_DEBUG
mt9m001_g_register(struct v4l2_subdev * sd,struct v4l2_dbg_register * reg)342 static int mt9m001_g_register(struct v4l2_subdev *sd,
343 struct v4l2_dbg_register *reg)
344 {
345 struct i2c_client *client = v4l2_get_subdevdata(sd);
346
347 if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
348 return -EINVAL;
349
350 if (reg->match.addr != client->addr)
351 return -ENODEV;
352
353 reg->size = 2;
354 reg->val = reg_read(client, reg->reg);
355
356 if (reg->val > 0xffff)
357 return -EIO;
358
359 return 0;
360 }
361
mt9m001_s_register(struct v4l2_subdev * sd,struct v4l2_dbg_register * reg)362 static int mt9m001_s_register(struct v4l2_subdev *sd,
363 struct v4l2_dbg_register *reg)
364 {
365 struct i2c_client *client = v4l2_get_subdevdata(sd);
366
367 if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
368 return -EINVAL;
369
370 if (reg->match.addr != client->addr)
371 return -ENODEV;
372
373 if (reg_write(client, reg->reg, reg->val) < 0)
374 return -EIO;
375
376 return 0;
377 }
378 #endif
379
mt9m001_g_volatile_ctrl(struct v4l2_ctrl * ctrl)380 static int mt9m001_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
381 {
382 struct mt9m001 *mt9m001 = container_of(ctrl->handler,
383 struct mt9m001, hdl);
384 s32 min, max;
385
386 switch (ctrl->id) {
387 case V4L2_CID_EXPOSURE_AUTO:
388 min = mt9m001->exposure->minimum;
389 max = mt9m001->exposure->maximum;
390 mt9m001->exposure->val =
391 (524 + (mt9m001->total_h - 1) * (max - min)) / 1048 + min;
392 break;
393 }
394 return 0;
395 }
396
mt9m001_s_ctrl(struct v4l2_ctrl * ctrl)397 static int mt9m001_s_ctrl(struct v4l2_ctrl *ctrl)
398 {
399 struct mt9m001 *mt9m001 = container_of(ctrl->handler,
400 struct mt9m001, hdl);
401 struct v4l2_subdev *sd = &mt9m001->subdev;
402 struct i2c_client *client = v4l2_get_subdevdata(sd);
403 struct v4l2_ctrl *exp = mt9m001->exposure;
404 int data;
405
406 switch (ctrl->id) {
407 case V4L2_CID_VFLIP:
408 if (ctrl->val)
409 data = reg_set(client, MT9M001_READ_OPTIONS2, 0x8000);
410 else
411 data = reg_clear(client, MT9M001_READ_OPTIONS2, 0x8000);
412 if (data < 0)
413 return -EIO;
414 return 0;
415
416 case V4L2_CID_GAIN:
417 /* See Datasheet Table 7, Gain settings. */
418 if (ctrl->val <= ctrl->default_value) {
419 /* Pack it into 0..1 step 0.125, register values 0..8 */
420 unsigned long range = ctrl->default_value - ctrl->minimum;
421 data = ((ctrl->val - ctrl->minimum) * 8 + range / 2) / range;
422
423 dev_dbg(&client->dev, "Setting gain %d\n", data);
424 data = reg_write(client, MT9M001_GLOBAL_GAIN, data);
425 if (data < 0)
426 return -EIO;
427 } else {
428 /* Pack it into 1.125..15 variable step, register values 9..67 */
429 /* We assume qctrl->maximum - qctrl->default_value - 1 > 0 */
430 unsigned long range = ctrl->maximum - ctrl->default_value - 1;
431 unsigned long gain = ((ctrl->val - ctrl->default_value - 1) *
432 111 + range / 2) / range + 9;
433
434 if (gain <= 32)
435 data = gain;
436 else if (gain <= 64)
437 data = ((gain - 32) * 16 + 16) / 32 + 80;
438 else
439 data = ((gain - 64) * 7 + 28) / 56 + 96;
440
441 dev_dbg(&client->dev, "Setting gain from %d to %d\n",
442 reg_read(client, MT9M001_GLOBAL_GAIN), data);
443 data = reg_write(client, MT9M001_GLOBAL_GAIN, data);
444 if (data < 0)
445 return -EIO;
446 }
447 return 0;
448
449 case V4L2_CID_EXPOSURE_AUTO:
450 if (ctrl->val == V4L2_EXPOSURE_MANUAL) {
451 unsigned long range = exp->maximum - exp->minimum;
452 unsigned long shutter = ((exp->val - exp->minimum) * 1048 +
453 range / 2) / range + 1;
454
455 dev_dbg(&client->dev,
456 "Setting shutter width from %d to %lu\n",
457 reg_read(client, MT9M001_SHUTTER_WIDTH), shutter);
458 if (reg_write(client, MT9M001_SHUTTER_WIDTH, shutter) < 0)
459 return -EIO;
460 } else {
461 const u16 vblank = 25;
462
463 mt9m001->total_h = mt9m001->rect.height +
464 mt9m001->y_skip_top + vblank;
465 if (reg_write(client, MT9M001_SHUTTER_WIDTH, mt9m001->total_h) < 0)
466 return -EIO;
467 }
468 return 0;
469 }
470 return -EINVAL;
471 }
472
473 /*
474 * Interface active, can use i2c. If it fails, it can indeed mean, that
475 * this wasn't our capture interface, so, we wait for the right one
476 */
mt9m001_video_probe(struct soc_camera_link * icl,struct i2c_client * client)477 static int mt9m001_video_probe(struct soc_camera_link *icl,
478 struct i2c_client *client)
479 {
480 struct mt9m001 *mt9m001 = to_mt9m001(client);
481 s32 data;
482 unsigned long flags;
483 int ret;
484
485 /* Enable the chip */
486 data = reg_write(client, MT9M001_CHIP_ENABLE, 1);
487 dev_dbg(&client->dev, "write: %d\n", data);
488
489 /* Read out the chip version register */
490 data = reg_read(client, MT9M001_CHIP_VERSION);
491
492 /* must be 0x8411 or 0x8421 for colour sensor and 8431 for bw */
493 switch (data) {
494 case 0x8411:
495 case 0x8421:
496 mt9m001->model = V4L2_IDENT_MT9M001C12ST;
497 mt9m001->fmts = mt9m001_colour_fmts;
498 break;
499 case 0x8431:
500 mt9m001->model = V4L2_IDENT_MT9M001C12STM;
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 return -ENODEV;
507 }
508
509 mt9m001->num_fmts = 0;
510
511 /*
512 * This is a 10bit sensor, so by default we only allow 10bit.
513 * The platform may support different bus widths due to
514 * different routing of the data lines.
515 */
516 if (icl->query_bus_param)
517 flags = icl->query_bus_param(icl);
518 else
519 flags = SOCAM_DATAWIDTH_10;
520
521 if (flags & SOCAM_DATAWIDTH_10)
522 mt9m001->num_fmts++;
523 else
524 mt9m001->fmts++;
525
526 if (flags & SOCAM_DATAWIDTH_8)
527 mt9m001->num_fmts++;
528
529 mt9m001->fmt = &mt9m001->fmts[0];
530
531 dev_info(&client->dev, "Detected a MT9M001 chip ID %x (%s)\n", data,
532 data == 0x8431 ? "C12STM" : "C12ST");
533
534 ret = mt9m001_init(client);
535 if (ret < 0)
536 dev_err(&client->dev, "Failed to initialise the camera\n");
537
538 /* mt9m001_init() has reset the chip, returning registers to defaults */
539 return v4l2_ctrl_handler_setup(&mt9m001->hdl);
540 }
541
mt9m001_video_remove(struct soc_camera_link * icl)542 static void mt9m001_video_remove(struct soc_camera_link *icl)
543 {
544 if (icl->free_bus)
545 icl->free_bus(icl);
546 }
547
mt9m001_g_skip_top_lines(struct v4l2_subdev * sd,u32 * lines)548 static int mt9m001_g_skip_top_lines(struct v4l2_subdev *sd, u32 *lines)
549 {
550 struct i2c_client *client = v4l2_get_subdevdata(sd);
551 struct mt9m001 *mt9m001 = to_mt9m001(client);
552
553 *lines = mt9m001->y_skip_top;
554
555 return 0;
556 }
557
558 static const struct v4l2_ctrl_ops mt9m001_ctrl_ops = {
559 .g_volatile_ctrl = mt9m001_g_volatile_ctrl,
560 .s_ctrl = mt9m001_s_ctrl,
561 };
562
563 static struct v4l2_subdev_core_ops mt9m001_subdev_core_ops = {
564 .g_chip_ident = mt9m001_g_chip_ident,
565 #ifdef CONFIG_VIDEO_ADV_DEBUG
566 .g_register = mt9m001_g_register,
567 .s_register = mt9m001_s_register,
568 #endif
569 };
570
mt9m001_enum_fmt(struct v4l2_subdev * sd,unsigned int index,enum v4l2_mbus_pixelcode * code)571 static int mt9m001_enum_fmt(struct v4l2_subdev *sd, unsigned int index,
572 enum v4l2_mbus_pixelcode *code)
573 {
574 struct i2c_client *client = v4l2_get_subdevdata(sd);
575 struct mt9m001 *mt9m001 = to_mt9m001(client);
576
577 if (index >= mt9m001->num_fmts)
578 return -EINVAL;
579
580 *code = mt9m001->fmts[index].code;
581 return 0;
582 }
583
mt9m001_g_mbus_config(struct v4l2_subdev * sd,struct v4l2_mbus_config * cfg)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_link *icl = soc_camera_i2c_to_link(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(icl, cfg);
596
597 return 0;
598 }
599
mt9m001_s_mbus_config(struct v4l2_subdev * sd,const struct v4l2_mbus_config * cfg)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_link *icl = soc_camera_i2c_to_link(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 (icl->set_bus_param)
609 return icl->set_bus_param(icl, 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 .g_mbus_fmt = mt9m001_g_fmt,
622 .try_mbus_fmt = mt9m001_try_fmt,
623 .s_crop = mt9m001_s_crop,
624 .g_crop = mt9m001_g_crop,
625 .cropcap = mt9m001_cropcap,
626 .enum_mbus_fmt = mt9m001_enum_fmt,
627 .g_mbus_config = mt9m001_g_mbus_config,
628 .s_mbus_config = mt9m001_s_mbus_config,
629 };
630
631 static struct v4l2_subdev_sensor_ops mt9m001_subdev_sensor_ops = {
632 .g_skip_top_lines = mt9m001_g_skip_top_lines,
633 };
634
635 static struct v4l2_subdev_ops mt9m001_subdev_ops = {
636 .core = &mt9m001_subdev_core_ops,
637 .video = &mt9m001_subdev_video_ops,
638 .sensor = &mt9m001_subdev_sensor_ops,
639 };
640
mt9m001_probe(struct i2c_client * client,const struct i2c_device_id * did)641 static int mt9m001_probe(struct i2c_client *client,
642 const struct i2c_device_id *did)
643 {
644 struct mt9m001 *mt9m001;
645 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
646 struct soc_camera_link *icl = soc_camera_i2c_to_link(client);
647 int ret;
648
649 if (!icl) {
650 dev_err(&client->dev, "MT9M001 driver needs platform data\n");
651 return -EINVAL;
652 }
653
654 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
655 dev_warn(&adapter->dev,
656 "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
657 return -EIO;
658 }
659
660 mt9m001 = kzalloc(sizeof(struct mt9m001), GFP_KERNEL);
661 if (!mt9m001)
662 return -ENOMEM;
663
664 v4l2_i2c_subdev_init(&mt9m001->subdev, client, &mt9m001_subdev_ops);
665 v4l2_ctrl_handler_init(&mt9m001->hdl, 4);
666 v4l2_ctrl_new_std(&mt9m001->hdl, &mt9m001_ctrl_ops,
667 V4L2_CID_VFLIP, 0, 1, 1, 0);
668 v4l2_ctrl_new_std(&mt9m001->hdl, &mt9m001_ctrl_ops,
669 V4L2_CID_GAIN, 0, 127, 1, 64);
670 mt9m001->exposure = v4l2_ctrl_new_std(&mt9m001->hdl, &mt9m001_ctrl_ops,
671 V4L2_CID_EXPOSURE, 1, 255, 1, 255);
672 /*
673 * Simulated autoexposure. If enabled, we calculate shutter width
674 * ourselves in the driver based on vertical blanking and frame width
675 */
676 mt9m001->autoexposure = v4l2_ctrl_new_std_menu(&mt9m001->hdl,
677 &mt9m001_ctrl_ops, V4L2_CID_EXPOSURE_AUTO, 1, 0,
678 V4L2_EXPOSURE_AUTO);
679 mt9m001->subdev.ctrl_handler = &mt9m001->hdl;
680 if (mt9m001->hdl.error) {
681 int err = mt9m001->hdl.error;
682
683 kfree(mt9m001);
684 return err;
685 }
686 v4l2_ctrl_auto_cluster(2, &mt9m001->autoexposure,
687 V4L2_EXPOSURE_MANUAL, true);
688
689 /* Second stage probe - when a capture adapter is there */
690 mt9m001->y_skip_top = 0;
691 mt9m001->rect.left = MT9M001_COLUMN_SKIP;
692 mt9m001->rect.top = MT9M001_ROW_SKIP;
693 mt9m001->rect.width = MT9M001_MAX_WIDTH;
694 mt9m001->rect.height = MT9M001_MAX_HEIGHT;
695
696 ret = mt9m001_video_probe(icl, client);
697 if (ret) {
698 v4l2_ctrl_handler_free(&mt9m001->hdl);
699 kfree(mt9m001);
700 }
701
702 return ret;
703 }
704
mt9m001_remove(struct i2c_client * client)705 static int mt9m001_remove(struct i2c_client *client)
706 {
707 struct mt9m001 *mt9m001 = to_mt9m001(client);
708 struct soc_camera_link *icl = soc_camera_i2c_to_link(client);
709
710 v4l2_device_unregister_subdev(&mt9m001->subdev);
711 v4l2_ctrl_handler_free(&mt9m001->hdl);
712 mt9m001_video_remove(icl);
713 kfree(mt9m001);
714
715 return 0;
716 }
717
718 static const struct i2c_device_id mt9m001_id[] = {
719 { "mt9m001", 0 },
720 { }
721 };
722 MODULE_DEVICE_TABLE(i2c, mt9m001_id);
723
724 static struct i2c_driver mt9m001_i2c_driver = {
725 .driver = {
726 .name = "mt9m001",
727 },
728 .probe = mt9m001_probe,
729 .remove = mt9m001_remove,
730 .id_table = mt9m001_id,
731 };
732
mt9m001_mod_init(void)733 static int __init mt9m001_mod_init(void)
734 {
735 return i2c_add_driver(&mt9m001_i2c_driver);
736 }
737
mt9m001_mod_exit(void)738 static void __exit mt9m001_mod_exit(void)
739 {
740 i2c_del_driver(&mt9m001_i2c_driver);
741 }
742
743 module_init(mt9m001_mod_init);
744 module_exit(mt9m001_mod_exit);
745
746 MODULE_DESCRIPTION("Micron MT9M001 Camera driver");
747 MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
748 MODULE_LICENSE("GPL");
749