1 /*
2 * Driver for MT9M032 CMOS Image Sensor from Micron
3 *
4 * Copyright (C) 2010-2011 Lund Engineering
5 * Contact: Gil Lund <gwlund@lundeng.com>
6 * Author: Martin Hostettler <martin@neutronstar.dyndns.org>
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * version 2 as published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20 * 02110-1301 USA
21 */
22
23 #include <linux/delay.h>
24 #include <linux/i2c.h>
25 #include <linux/init.h>
26 #include <linux/kernel.h>
27 #include <linux/math64.h>
28 #include <linux/module.h>
29 #include <linux/mutex.h>
30 #include <linux/slab.h>
31 #include <linux/v4l2-mediabus.h>
32
33 #include <media/media-entity.h>
34 #include <media/mt9m032.h>
35 #include <media/v4l2-ctrls.h>
36 #include <media/v4l2-device.h>
37 #include <media/v4l2-subdev.h>
38
39 #include "aptina-pll.h"
40
41 /*
42 * width and height include active boundary and black parts
43 *
44 * column 0- 15 active boundary
45 * column 16-1455 image
46 * column 1456-1471 active boundary
47 * column 1472-1599 black
48 *
49 * row 0- 51 black
50 * row 53- 59 active boundary
51 * row 60-1139 image
52 * row 1140-1147 active boundary
53 * row 1148-1151 black
54 */
55
56 #define MT9M032_PIXEL_ARRAY_WIDTH 1600
57 #define MT9M032_PIXEL_ARRAY_HEIGHT 1152
58
59 #define MT9M032_CHIP_VERSION 0x00
60 #define MT9M032_CHIP_VERSION_VALUE 0x1402
61 #define MT9M032_ROW_START 0x01
62 #define MT9M032_ROW_START_MIN 0
63 #define MT9M032_ROW_START_MAX 1152
64 #define MT9M032_ROW_START_DEF 60
65 #define MT9M032_COLUMN_START 0x02
66 #define MT9M032_COLUMN_START_MIN 0
67 #define MT9M032_COLUMN_START_MAX 1600
68 #define MT9M032_COLUMN_START_DEF 16
69 #define MT9M032_ROW_SIZE 0x03
70 #define MT9M032_ROW_SIZE_MIN 32
71 #define MT9M032_ROW_SIZE_MAX 1152
72 #define MT9M032_ROW_SIZE_DEF 1080
73 #define MT9M032_COLUMN_SIZE 0x04
74 #define MT9M032_COLUMN_SIZE_MIN 32
75 #define MT9M032_COLUMN_SIZE_MAX 1600
76 #define MT9M032_COLUMN_SIZE_DEF 1440
77 #define MT9M032_HBLANK 0x05
78 #define MT9M032_VBLANK 0x06
79 #define MT9M032_VBLANK_MAX 0x7ff
80 #define MT9M032_SHUTTER_WIDTH_HIGH 0x08
81 #define MT9M032_SHUTTER_WIDTH_LOW 0x09
82 #define MT9M032_SHUTTER_WIDTH_MIN 1
83 #define MT9M032_SHUTTER_WIDTH_MAX 1048575
84 #define MT9M032_SHUTTER_WIDTH_DEF 1943
85 #define MT9M032_PIX_CLK_CTRL 0x0a
86 #define MT9M032_PIX_CLK_CTRL_INV_PIXCLK 0x8000
87 #define MT9M032_RESTART 0x0b
88 #define MT9M032_RESET 0x0d
89 #define MT9M032_PLL_CONFIG1 0x11
90 #define MT9M032_PLL_CONFIG1_PREDIV_MASK 0x3f
91 #define MT9M032_PLL_CONFIG1_MUL_SHIFT 8
92 #define MT9M032_READ_MODE1 0x1e
93 #define MT9M032_READ_MODE1_OUTPUT_BAD_FRAMES (1 << 13)
94 #define MT9M032_READ_MODE1_MAINTAIN_FRAME_RATE (1 << 12)
95 #define MT9M032_READ_MODE1_XOR_LINE_VALID (1 << 11)
96 #define MT9M032_READ_MODE1_CONT_LINE_VALID (1 << 10)
97 #define MT9M032_READ_MODE1_INVERT_TRIGGER (1 << 9)
98 #define MT9M032_READ_MODE1_SNAPSHOT (1 << 8)
99 #define MT9M032_READ_MODE1_GLOBAL_RESET (1 << 7)
100 #define MT9M032_READ_MODE1_BULB_EXPOSURE (1 << 6)
101 #define MT9M032_READ_MODE1_INVERT_STROBE (1 << 5)
102 #define MT9M032_READ_MODE1_STROBE_ENABLE (1 << 4)
103 #define MT9M032_READ_MODE1_STROBE_START_TRIG1 (0 << 2)
104 #define MT9M032_READ_MODE1_STROBE_START_EXP (1 << 2)
105 #define MT9M032_READ_MODE1_STROBE_START_SHUTTER (2 << 2)
106 #define MT9M032_READ_MODE1_STROBE_START_TRIG2 (3 << 2)
107 #define MT9M032_READ_MODE1_STROBE_END_TRIG1 (0 << 0)
108 #define MT9M032_READ_MODE1_STROBE_END_EXP (1 << 0)
109 #define MT9M032_READ_MODE1_STROBE_END_SHUTTER (2 << 0)
110 #define MT9M032_READ_MODE1_STROBE_END_TRIG2 (3 << 0)
111 #define MT9M032_READ_MODE2 0x20
112 #define MT9M032_READ_MODE2_VFLIP_SHIFT 15
113 #define MT9M032_READ_MODE2_HFLIP_SHIFT 14
114 #define MT9M032_READ_MODE2_ROW_BLC 0x40
115 #define MT9M032_GAIN_GREEN1 0x2b
116 #define MT9M032_GAIN_BLUE 0x2c
117 #define MT9M032_GAIN_RED 0x2d
118 #define MT9M032_GAIN_GREEN2 0x2e
119
120 /* write only */
121 #define MT9M032_GAIN_ALL 0x35
122 #define MT9M032_GAIN_DIGITAL_MASK 0x7f
123 #define MT9M032_GAIN_DIGITAL_SHIFT 8
124 #define MT9M032_GAIN_AMUL_SHIFT 6
125 #define MT9M032_GAIN_ANALOG_MASK 0x3f
126 #define MT9M032_FORMATTER1 0x9e
127 #define MT9M032_FORMATTER1_PLL_P1_6 (1 << 8)
128 #define MT9M032_FORMATTER1_PARALLEL (1 << 12)
129 #define MT9M032_FORMATTER2 0x9f
130 #define MT9M032_FORMATTER2_DOUT_EN 0x1000
131 #define MT9M032_FORMATTER2_PIXCLK_EN 0x2000
132
133 /*
134 * The available MT9M032 datasheet is missing documentation for register 0x10
135 * MT9P031 seems to be close enough, so use constants from that datasheet for
136 * now.
137 * But keep the name MT9P031 to remind us, that this isn't really confirmed
138 * for this sensor.
139 */
140 #define MT9P031_PLL_CONTROL 0x10
141 #define MT9P031_PLL_CONTROL_PWROFF 0x0050
142 #define MT9P031_PLL_CONTROL_PWRON 0x0051
143 #define MT9P031_PLL_CONTROL_USEPLL 0x0052
144
145 struct mt9m032 {
146 struct v4l2_subdev subdev;
147 struct media_pad pad;
148 struct mt9m032_platform_data *pdata;
149
150 unsigned int pix_clock;
151
152 struct v4l2_ctrl_handler ctrls;
153 struct {
154 struct v4l2_ctrl *hflip;
155 struct v4l2_ctrl *vflip;
156 };
157
158 struct mutex lock; /* Protects streaming, format, interval and crop */
159
160 bool streaming;
161
162 struct v4l2_mbus_framefmt format;
163 struct v4l2_rect crop;
164 struct v4l2_fract frame_interval;
165 };
166
167 #define to_mt9m032(sd) container_of(sd, struct mt9m032, subdev)
168 #define to_dev(sensor) \
169 (&((struct i2c_client *)v4l2_get_subdevdata(&(sensor)->subdev))->dev)
170
mt9m032_read(struct i2c_client * client,u8 reg)171 static int mt9m032_read(struct i2c_client *client, u8 reg)
172 {
173 return i2c_smbus_read_word_swapped(client, reg);
174 }
175
mt9m032_write(struct i2c_client * client,u8 reg,const u16 data)176 static int mt9m032_write(struct i2c_client *client, u8 reg, const u16 data)
177 {
178 return i2c_smbus_write_word_swapped(client, reg, data);
179 }
180
mt9m032_row_time(struct mt9m032 * sensor,unsigned int width)181 static u32 mt9m032_row_time(struct mt9m032 *sensor, unsigned int width)
182 {
183 unsigned int effective_width;
184 u32 ns;
185
186 effective_width = width + 716; /* empirical value */
187 ns = div_u64(1000000000ULL * effective_width, sensor->pix_clock);
188 dev_dbg(to_dev(sensor), "MT9M032 line time: %u ns\n", ns);
189 return ns;
190 }
191
mt9m032_update_timing(struct mt9m032 * sensor,struct v4l2_fract * interval)192 static int mt9m032_update_timing(struct mt9m032 *sensor,
193 struct v4l2_fract *interval)
194 {
195 struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
196 struct v4l2_rect *crop = &sensor->crop;
197 unsigned int min_vblank;
198 unsigned int vblank;
199 u32 row_time;
200
201 if (!interval)
202 interval = &sensor->frame_interval;
203
204 row_time = mt9m032_row_time(sensor, crop->width);
205
206 vblank = div_u64(1000000000ULL * interval->numerator,
207 (u64)row_time * interval->denominator)
208 - crop->height;
209
210 if (vblank > MT9M032_VBLANK_MAX) {
211 /* hardware limits to 11 bit values */
212 interval->denominator = 1000;
213 interval->numerator =
214 div_u64((crop->height + MT9M032_VBLANK_MAX) *
215 (u64)row_time * interval->denominator,
216 1000000000ULL);
217 vblank = div_u64(1000000000ULL * interval->numerator,
218 (u64)row_time * interval->denominator)
219 - crop->height;
220 }
221 /* enforce minimal 1.6ms blanking time. */
222 min_vblank = 1600000 / row_time;
223 vblank = clamp_t(unsigned int, vblank, min_vblank, MT9M032_VBLANK_MAX);
224
225 return mt9m032_write(client, MT9M032_VBLANK, vblank);
226 }
227
mt9m032_update_geom_timing(struct mt9m032 * sensor)228 static int mt9m032_update_geom_timing(struct mt9m032 *sensor)
229 {
230 struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
231 int ret;
232
233 ret = mt9m032_write(client, MT9M032_COLUMN_SIZE,
234 sensor->crop.width - 1);
235 if (!ret)
236 ret = mt9m032_write(client, MT9M032_ROW_SIZE,
237 sensor->crop.height - 1);
238 if (!ret)
239 ret = mt9m032_write(client, MT9M032_COLUMN_START,
240 sensor->crop.left);
241 if (!ret)
242 ret = mt9m032_write(client, MT9M032_ROW_START,
243 sensor->crop.top);
244 if (!ret)
245 ret = mt9m032_update_timing(sensor, NULL);
246 return ret;
247 }
248
update_formatter2(struct mt9m032 * sensor,bool streaming)249 static int update_formatter2(struct mt9m032 *sensor, bool streaming)
250 {
251 struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
252 u16 reg_val = MT9M032_FORMATTER2_DOUT_EN
253 | 0x0070; /* parts reserved! */
254 /* possibly for changing to 14-bit mode */
255
256 if (streaming)
257 reg_val |= MT9M032_FORMATTER2_PIXCLK_EN; /* pixclock enable */
258
259 return mt9m032_write(client, MT9M032_FORMATTER2, reg_val);
260 }
261
mt9m032_setup_pll(struct mt9m032 * sensor)262 static int mt9m032_setup_pll(struct mt9m032 *sensor)
263 {
264 static const struct aptina_pll_limits limits = {
265 .ext_clock_min = 8000000,
266 .ext_clock_max = 16500000,
267 .int_clock_min = 2000000,
268 .int_clock_max = 24000000,
269 .out_clock_min = 322000000,
270 .out_clock_max = 693000000,
271 .pix_clock_max = 99000000,
272 .n_min = 1,
273 .n_max = 64,
274 .m_min = 16,
275 .m_max = 255,
276 .p1_min = 6,
277 .p1_max = 7,
278 };
279
280 struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
281 struct mt9m032_platform_data *pdata = sensor->pdata;
282 struct aptina_pll pll;
283 u16 reg_val;
284 int ret;
285
286 pll.ext_clock = pdata->ext_clock;
287 pll.pix_clock = pdata->pix_clock;
288
289 ret = aptina_pll_calculate(&client->dev, &limits, &pll);
290 if (ret < 0)
291 return ret;
292
293 sensor->pix_clock = pdata->pix_clock;
294
295 ret = mt9m032_write(client, MT9M032_PLL_CONFIG1,
296 (pll.m << MT9M032_PLL_CONFIG1_MUL_SHIFT) |
297 ((pll.n - 1) & MT9M032_PLL_CONFIG1_PREDIV_MASK));
298 if (!ret)
299 ret = mt9m032_write(client, MT9P031_PLL_CONTROL,
300 MT9P031_PLL_CONTROL_PWRON |
301 MT9P031_PLL_CONTROL_USEPLL);
302 if (!ret) /* more reserved, Continuous, Master Mode */
303 ret = mt9m032_write(client, MT9M032_READ_MODE1, 0x8000 |
304 MT9M032_READ_MODE1_STROBE_START_EXP |
305 MT9M032_READ_MODE1_STROBE_END_SHUTTER);
306 if (!ret) {
307 reg_val = (pll.p1 == 6 ? MT9M032_FORMATTER1_PLL_P1_6 : 0)
308 | MT9M032_FORMATTER1_PARALLEL | 0x001e; /* 14-bit */
309 ret = mt9m032_write(client, MT9M032_FORMATTER1, reg_val);
310 }
311
312 return ret;
313 }
314
315 /* -----------------------------------------------------------------------------
316 * Subdev pad operations
317 */
318
mt9m032_enum_mbus_code(struct v4l2_subdev * subdev,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_mbus_code_enum * code)319 static int mt9m032_enum_mbus_code(struct v4l2_subdev *subdev,
320 struct v4l2_subdev_pad_config *cfg,
321 struct v4l2_subdev_mbus_code_enum *code)
322 {
323 if (code->index != 0)
324 return -EINVAL;
325
326 code->code = MEDIA_BUS_FMT_Y8_1X8;
327 return 0;
328 }
329
mt9m032_enum_frame_size(struct v4l2_subdev * subdev,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_frame_size_enum * fse)330 static int mt9m032_enum_frame_size(struct v4l2_subdev *subdev,
331 struct v4l2_subdev_pad_config *cfg,
332 struct v4l2_subdev_frame_size_enum *fse)
333 {
334 if (fse->index != 0 || fse->code != MEDIA_BUS_FMT_Y8_1X8)
335 return -EINVAL;
336
337 fse->min_width = MT9M032_COLUMN_SIZE_DEF;
338 fse->max_width = MT9M032_COLUMN_SIZE_DEF;
339 fse->min_height = MT9M032_ROW_SIZE_DEF;
340 fse->max_height = MT9M032_ROW_SIZE_DEF;
341
342 return 0;
343 }
344
345 /**
346 * __mt9m032_get_pad_crop() - get crop rect
347 * @sensor: pointer to the sensor struct
348 * @cfg: v4l2_subdev_pad_config for getting the try crop rect from
349 * @which: select try or active crop rect
350 *
351 * Returns a pointer the current active or fh relative try crop rect
352 */
353 static struct v4l2_rect *
__mt9m032_get_pad_crop(struct mt9m032 * sensor,struct v4l2_subdev_pad_config * cfg,enum v4l2_subdev_format_whence which)354 __mt9m032_get_pad_crop(struct mt9m032 *sensor, struct v4l2_subdev_pad_config *cfg,
355 enum v4l2_subdev_format_whence which)
356 {
357 switch (which) {
358 case V4L2_SUBDEV_FORMAT_TRY:
359 return v4l2_subdev_get_try_crop(&sensor->subdev, cfg, 0);
360 case V4L2_SUBDEV_FORMAT_ACTIVE:
361 return &sensor->crop;
362 default:
363 return NULL;
364 }
365 }
366
367 /**
368 * __mt9m032_get_pad_format() - get format
369 * @sensor: pointer to the sensor struct
370 * @cfg: v4l2_subdev_pad_config for getting the try format from
371 * @which: select try or active format
372 *
373 * Returns a pointer the current active or fh relative try format
374 */
375 static struct v4l2_mbus_framefmt *
__mt9m032_get_pad_format(struct mt9m032 * sensor,struct v4l2_subdev_pad_config * cfg,enum v4l2_subdev_format_whence which)376 __mt9m032_get_pad_format(struct mt9m032 *sensor, struct v4l2_subdev_pad_config *cfg,
377 enum v4l2_subdev_format_whence which)
378 {
379 switch (which) {
380 case V4L2_SUBDEV_FORMAT_TRY:
381 return v4l2_subdev_get_try_format(&sensor->subdev, cfg, 0);
382 case V4L2_SUBDEV_FORMAT_ACTIVE:
383 return &sensor->format;
384 default:
385 return NULL;
386 }
387 }
388
mt9m032_get_pad_format(struct v4l2_subdev * subdev,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_format * fmt)389 static int mt9m032_get_pad_format(struct v4l2_subdev *subdev,
390 struct v4l2_subdev_pad_config *cfg,
391 struct v4l2_subdev_format *fmt)
392 {
393 struct mt9m032 *sensor = to_mt9m032(subdev);
394
395 mutex_lock(&sensor->lock);
396 fmt->format = *__mt9m032_get_pad_format(sensor, cfg, fmt->which);
397 mutex_unlock(&sensor->lock);
398
399 return 0;
400 }
401
mt9m032_set_pad_format(struct v4l2_subdev * subdev,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_format * fmt)402 static int mt9m032_set_pad_format(struct v4l2_subdev *subdev,
403 struct v4l2_subdev_pad_config *cfg,
404 struct v4l2_subdev_format *fmt)
405 {
406 struct mt9m032 *sensor = to_mt9m032(subdev);
407 int ret;
408
409 mutex_lock(&sensor->lock);
410
411 if (sensor->streaming && fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
412 ret = -EBUSY;
413 goto done;
414 }
415
416 /* Scaling is not supported, the format is thus fixed. */
417 fmt->format = *__mt9m032_get_pad_format(sensor, cfg, fmt->which);
418 ret = 0;
419
420 done:
421 mutex_unlock(&sensor->lock);
422 return ret;
423 }
424
mt9m032_get_pad_selection(struct v4l2_subdev * subdev,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_selection * sel)425 static int mt9m032_get_pad_selection(struct v4l2_subdev *subdev,
426 struct v4l2_subdev_pad_config *cfg,
427 struct v4l2_subdev_selection *sel)
428 {
429 struct mt9m032 *sensor = to_mt9m032(subdev);
430
431 if (sel->target != V4L2_SEL_TGT_CROP)
432 return -EINVAL;
433
434 mutex_lock(&sensor->lock);
435 sel->r = *__mt9m032_get_pad_crop(sensor, cfg, sel->which);
436 mutex_unlock(&sensor->lock);
437
438 return 0;
439 }
440
mt9m032_set_pad_selection(struct v4l2_subdev * subdev,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_selection * sel)441 static int mt9m032_set_pad_selection(struct v4l2_subdev *subdev,
442 struct v4l2_subdev_pad_config *cfg,
443 struct v4l2_subdev_selection *sel)
444 {
445 struct mt9m032 *sensor = to_mt9m032(subdev);
446 struct v4l2_mbus_framefmt *format;
447 struct v4l2_rect *__crop;
448 struct v4l2_rect rect;
449 int ret = 0;
450
451 if (sel->target != V4L2_SEL_TGT_CROP)
452 return -EINVAL;
453
454 mutex_lock(&sensor->lock);
455
456 if (sensor->streaming && sel->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
457 ret = -EBUSY;
458 goto done;
459 }
460
461 /* Clamp the crop rectangle boundaries and align them to a multiple of 2
462 * pixels to ensure a GRBG Bayer pattern.
463 */
464 rect.left = clamp(ALIGN(sel->r.left, 2), MT9M032_COLUMN_START_MIN,
465 MT9M032_COLUMN_START_MAX);
466 rect.top = clamp(ALIGN(sel->r.top, 2), MT9M032_ROW_START_MIN,
467 MT9M032_ROW_START_MAX);
468 rect.width = clamp_t(unsigned int, ALIGN(sel->r.width, 2),
469 MT9M032_COLUMN_SIZE_MIN, MT9M032_COLUMN_SIZE_MAX);
470 rect.height = clamp_t(unsigned int, ALIGN(sel->r.height, 2),
471 MT9M032_ROW_SIZE_MIN, MT9M032_ROW_SIZE_MAX);
472
473 rect.width = min_t(unsigned int, rect.width,
474 MT9M032_PIXEL_ARRAY_WIDTH - rect.left);
475 rect.height = min_t(unsigned int, rect.height,
476 MT9M032_PIXEL_ARRAY_HEIGHT - rect.top);
477
478 __crop = __mt9m032_get_pad_crop(sensor, cfg, sel->which);
479
480 if (rect.width != __crop->width || rect.height != __crop->height) {
481 /* Reset the output image size if the crop rectangle size has
482 * been modified.
483 */
484 format = __mt9m032_get_pad_format(sensor, cfg, sel->which);
485 format->width = rect.width;
486 format->height = rect.height;
487 }
488
489 *__crop = rect;
490 sel->r = rect;
491
492 if (sel->which == V4L2_SUBDEV_FORMAT_ACTIVE)
493 ret = mt9m032_update_geom_timing(sensor);
494
495 done:
496 mutex_unlock(&sensor->lock);
497 return ret;
498 }
499
mt9m032_get_frame_interval(struct v4l2_subdev * subdev,struct v4l2_subdev_frame_interval * fi)500 static int mt9m032_get_frame_interval(struct v4l2_subdev *subdev,
501 struct v4l2_subdev_frame_interval *fi)
502 {
503 struct mt9m032 *sensor = to_mt9m032(subdev);
504
505 mutex_lock(&sensor->lock);
506 memset(fi, 0, sizeof(*fi));
507 fi->interval = sensor->frame_interval;
508 mutex_unlock(&sensor->lock);
509
510 return 0;
511 }
512
mt9m032_set_frame_interval(struct v4l2_subdev * subdev,struct v4l2_subdev_frame_interval * fi)513 static int mt9m032_set_frame_interval(struct v4l2_subdev *subdev,
514 struct v4l2_subdev_frame_interval *fi)
515 {
516 struct mt9m032 *sensor = to_mt9m032(subdev);
517 int ret;
518
519 mutex_lock(&sensor->lock);
520
521 if (sensor->streaming) {
522 ret = -EBUSY;
523 goto done;
524 }
525
526 /* Avoid divisions by 0. */
527 if (fi->interval.denominator == 0)
528 fi->interval.denominator = 1;
529
530 ret = mt9m032_update_timing(sensor, &fi->interval);
531 if (!ret)
532 sensor->frame_interval = fi->interval;
533
534 done:
535 mutex_unlock(&sensor->lock);
536 return ret;
537 }
538
mt9m032_s_stream(struct v4l2_subdev * subdev,int streaming)539 static int mt9m032_s_stream(struct v4l2_subdev *subdev, int streaming)
540 {
541 struct mt9m032 *sensor = to_mt9m032(subdev);
542 int ret;
543
544 mutex_lock(&sensor->lock);
545 ret = update_formatter2(sensor, streaming);
546 if (!ret)
547 sensor->streaming = streaming;
548 mutex_unlock(&sensor->lock);
549
550 return ret;
551 }
552
553 /* -----------------------------------------------------------------------------
554 * V4L2 subdev core operations
555 */
556
557 #ifdef CONFIG_VIDEO_ADV_DEBUG
mt9m032_g_register(struct v4l2_subdev * sd,struct v4l2_dbg_register * reg)558 static int mt9m032_g_register(struct v4l2_subdev *sd,
559 struct v4l2_dbg_register *reg)
560 {
561 struct mt9m032 *sensor = to_mt9m032(sd);
562 struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
563 int val;
564
565 if (reg->reg > 0xff)
566 return -EINVAL;
567
568 val = mt9m032_read(client, reg->reg);
569 if (val < 0)
570 return -EIO;
571
572 reg->size = 2;
573 reg->val = val;
574
575 return 0;
576 }
577
mt9m032_s_register(struct v4l2_subdev * sd,const struct v4l2_dbg_register * reg)578 static int mt9m032_s_register(struct v4l2_subdev *sd,
579 const struct v4l2_dbg_register *reg)
580 {
581 struct mt9m032 *sensor = to_mt9m032(sd);
582 struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
583
584 if (reg->reg > 0xff)
585 return -EINVAL;
586
587 return mt9m032_write(client, reg->reg, reg->val);
588 }
589 #endif
590
591 /* -----------------------------------------------------------------------------
592 * V4L2 subdev control operations
593 */
594
update_read_mode2(struct mt9m032 * sensor,bool vflip,bool hflip)595 static int update_read_mode2(struct mt9m032 *sensor, bool vflip, bool hflip)
596 {
597 struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
598 int reg_val = (vflip << MT9M032_READ_MODE2_VFLIP_SHIFT)
599 | (hflip << MT9M032_READ_MODE2_HFLIP_SHIFT)
600 | MT9M032_READ_MODE2_ROW_BLC
601 | 0x0007;
602
603 return mt9m032_write(client, MT9M032_READ_MODE2, reg_val);
604 }
605
mt9m032_set_gain(struct mt9m032 * sensor,s32 val)606 static int mt9m032_set_gain(struct mt9m032 *sensor, s32 val)
607 {
608 struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
609 int digital_gain_val; /* in 1/8th (0..127) */
610 int analog_mul; /* 0 or 1 */
611 int analog_gain_val; /* in 1/16th. (0..63) */
612 u16 reg_val;
613
614 digital_gain_val = 51; /* from setup example */
615
616 if (val < 63) {
617 analog_mul = 0;
618 analog_gain_val = val;
619 } else {
620 analog_mul = 1;
621 analog_gain_val = val / 2;
622 }
623
624 /* a_gain = (1 + analog_mul) + (analog_gain_val + 1) / 16 */
625 /* overall_gain = a_gain * (1 + digital_gain_val / 8) */
626
627 reg_val = ((digital_gain_val & MT9M032_GAIN_DIGITAL_MASK)
628 << MT9M032_GAIN_DIGITAL_SHIFT)
629 | ((analog_mul & 1) << MT9M032_GAIN_AMUL_SHIFT)
630 | (analog_gain_val & MT9M032_GAIN_ANALOG_MASK);
631
632 return mt9m032_write(client, MT9M032_GAIN_ALL, reg_val);
633 }
634
mt9m032_try_ctrl(struct v4l2_ctrl * ctrl)635 static int mt9m032_try_ctrl(struct v4l2_ctrl *ctrl)
636 {
637 if (ctrl->id == V4L2_CID_GAIN && ctrl->val >= 63) {
638 /* round because of multiplier used for values >= 63 */
639 ctrl->val &= ~1;
640 }
641
642 return 0;
643 }
644
mt9m032_set_ctrl(struct v4l2_ctrl * ctrl)645 static int mt9m032_set_ctrl(struct v4l2_ctrl *ctrl)
646 {
647 struct mt9m032 *sensor =
648 container_of(ctrl->handler, struct mt9m032, ctrls);
649 struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
650 int ret;
651
652 switch (ctrl->id) {
653 case V4L2_CID_GAIN:
654 return mt9m032_set_gain(sensor, ctrl->val);
655
656 case V4L2_CID_HFLIP:
657 /* case V4L2_CID_VFLIP: -- In the same cluster */
658 return update_read_mode2(sensor, sensor->vflip->val,
659 sensor->hflip->val);
660
661 case V4L2_CID_EXPOSURE:
662 ret = mt9m032_write(client, MT9M032_SHUTTER_WIDTH_HIGH,
663 (ctrl->val >> 16) & 0xffff);
664 if (ret < 0)
665 return ret;
666
667 return mt9m032_write(client, MT9M032_SHUTTER_WIDTH_LOW,
668 ctrl->val & 0xffff);
669 }
670
671 return 0;
672 }
673
674 static struct v4l2_ctrl_ops mt9m032_ctrl_ops = {
675 .s_ctrl = mt9m032_set_ctrl,
676 .try_ctrl = mt9m032_try_ctrl,
677 };
678
679 /* -------------------------------------------------------------------------- */
680
681 static const struct v4l2_subdev_core_ops mt9m032_core_ops = {
682 #ifdef CONFIG_VIDEO_ADV_DEBUG
683 .g_register = mt9m032_g_register,
684 .s_register = mt9m032_s_register,
685 #endif
686 };
687
688 static const struct v4l2_subdev_video_ops mt9m032_video_ops = {
689 .s_stream = mt9m032_s_stream,
690 .g_frame_interval = mt9m032_get_frame_interval,
691 .s_frame_interval = mt9m032_set_frame_interval,
692 };
693
694 static const struct v4l2_subdev_pad_ops mt9m032_pad_ops = {
695 .enum_mbus_code = mt9m032_enum_mbus_code,
696 .enum_frame_size = mt9m032_enum_frame_size,
697 .get_fmt = mt9m032_get_pad_format,
698 .set_fmt = mt9m032_set_pad_format,
699 .set_selection = mt9m032_set_pad_selection,
700 .get_selection = mt9m032_get_pad_selection,
701 };
702
703 static const struct v4l2_subdev_ops mt9m032_ops = {
704 .core = &mt9m032_core_ops,
705 .video = &mt9m032_video_ops,
706 .pad = &mt9m032_pad_ops,
707 };
708
709 /* -----------------------------------------------------------------------------
710 * Driver initialization and probing
711 */
712
mt9m032_probe(struct i2c_client * client,const struct i2c_device_id * devid)713 static int mt9m032_probe(struct i2c_client *client,
714 const struct i2c_device_id *devid)
715 {
716 struct mt9m032_platform_data *pdata = client->dev.platform_data;
717 struct i2c_adapter *adapter = client->adapter;
718 struct mt9m032 *sensor;
719 int chip_version;
720 int ret;
721
722 if (pdata == NULL) {
723 dev_err(&client->dev, "No platform data\n");
724 return -EINVAL;
725 }
726
727 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
728 dev_warn(&client->dev,
729 "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
730 return -EIO;
731 }
732
733 if (!client->dev.platform_data)
734 return -ENODEV;
735
736 sensor = devm_kzalloc(&client->dev, sizeof(*sensor), GFP_KERNEL);
737 if (sensor == NULL)
738 return -ENOMEM;
739
740 mutex_init(&sensor->lock);
741
742 sensor->pdata = pdata;
743
744 v4l2_i2c_subdev_init(&sensor->subdev, client, &mt9m032_ops);
745 sensor->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
746
747 chip_version = mt9m032_read(client, MT9M032_CHIP_VERSION);
748 if (chip_version != MT9M032_CHIP_VERSION_VALUE) {
749 dev_err(&client->dev, "MT9M032 not detected, wrong version "
750 "0x%04x\n", chip_version);
751 ret = -ENODEV;
752 goto error_sensor;
753 }
754
755 dev_info(&client->dev, "MT9M032 detected at address 0x%02x\n",
756 client->addr);
757
758 sensor->frame_interval.numerator = 1;
759 sensor->frame_interval.denominator = 30;
760
761 sensor->crop.left = MT9M032_COLUMN_START_DEF;
762 sensor->crop.top = MT9M032_ROW_START_DEF;
763 sensor->crop.width = MT9M032_COLUMN_SIZE_DEF;
764 sensor->crop.height = MT9M032_ROW_SIZE_DEF;
765
766 sensor->format.width = sensor->crop.width;
767 sensor->format.height = sensor->crop.height;
768 sensor->format.code = MEDIA_BUS_FMT_Y8_1X8;
769 sensor->format.field = V4L2_FIELD_NONE;
770 sensor->format.colorspace = V4L2_COLORSPACE_SRGB;
771
772 v4l2_ctrl_handler_init(&sensor->ctrls, 5);
773
774 v4l2_ctrl_new_std(&sensor->ctrls, &mt9m032_ctrl_ops,
775 V4L2_CID_GAIN, 0, 127, 1, 64);
776
777 sensor->hflip = v4l2_ctrl_new_std(&sensor->ctrls,
778 &mt9m032_ctrl_ops,
779 V4L2_CID_HFLIP, 0, 1, 1, 0);
780 sensor->vflip = v4l2_ctrl_new_std(&sensor->ctrls,
781 &mt9m032_ctrl_ops,
782 V4L2_CID_VFLIP, 0, 1, 1, 0);
783
784 v4l2_ctrl_new_std(&sensor->ctrls, &mt9m032_ctrl_ops,
785 V4L2_CID_EXPOSURE, MT9M032_SHUTTER_WIDTH_MIN,
786 MT9M032_SHUTTER_WIDTH_MAX, 1,
787 MT9M032_SHUTTER_WIDTH_DEF);
788 v4l2_ctrl_new_std(&sensor->ctrls, &mt9m032_ctrl_ops,
789 V4L2_CID_PIXEL_RATE, pdata->pix_clock,
790 pdata->pix_clock, 1, pdata->pix_clock);
791
792 if (sensor->ctrls.error) {
793 ret = sensor->ctrls.error;
794 dev_err(&client->dev, "control initialization error %d\n", ret);
795 goto error_ctrl;
796 }
797
798 v4l2_ctrl_cluster(2, &sensor->hflip);
799
800 sensor->subdev.ctrl_handler = &sensor->ctrls;
801 sensor->pad.flags = MEDIA_PAD_FL_SOURCE;
802 ret = media_entity_init(&sensor->subdev.entity, 1, &sensor->pad, 0);
803 if (ret < 0)
804 goto error_ctrl;
805
806 ret = mt9m032_write(client, MT9M032_RESET, 1); /* reset on */
807 if (ret < 0)
808 goto error_entity;
809 ret = mt9m032_write(client, MT9M032_RESET, 0); /* reset off */
810 if (ret < 0)
811 goto error_entity;
812
813 ret = mt9m032_setup_pll(sensor);
814 if (ret < 0)
815 goto error_entity;
816 usleep_range(10000, 11000);
817
818 ret = v4l2_ctrl_handler_setup(&sensor->ctrls);
819 if (ret < 0)
820 goto error_entity;
821
822 /* SIZE */
823 ret = mt9m032_update_geom_timing(sensor);
824 if (ret < 0)
825 goto error_entity;
826
827 ret = mt9m032_write(client, 0x41, 0x0000); /* reserved !!! */
828 if (ret < 0)
829 goto error_entity;
830 ret = mt9m032_write(client, 0x42, 0x0003); /* reserved !!! */
831 if (ret < 0)
832 goto error_entity;
833 ret = mt9m032_write(client, 0x43, 0x0003); /* reserved !!! */
834 if (ret < 0)
835 goto error_entity;
836 ret = mt9m032_write(client, 0x7f, 0x0000); /* reserved !!! */
837 if (ret < 0)
838 goto error_entity;
839 if (sensor->pdata->invert_pixclock) {
840 ret = mt9m032_write(client, MT9M032_PIX_CLK_CTRL,
841 MT9M032_PIX_CLK_CTRL_INV_PIXCLK);
842 if (ret < 0)
843 goto error_entity;
844 }
845
846 ret = mt9m032_write(client, MT9M032_RESTART, 1); /* Restart on */
847 if (ret < 0)
848 goto error_entity;
849 msleep(100);
850 ret = mt9m032_write(client, MT9M032_RESTART, 0); /* Restart off */
851 if (ret < 0)
852 goto error_entity;
853 msleep(100);
854 ret = update_formatter2(sensor, false);
855 if (ret < 0)
856 goto error_entity;
857
858 return ret;
859
860 error_entity:
861 media_entity_cleanup(&sensor->subdev.entity);
862 error_ctrl:
863 v4l2_ctrl_handler_free(&sensor->ctrls);
864 error_sensor:
865 mutex_destroy(&sensor->lock);
866 return ret;
867 }
868
mt9m032_remove(struct i2c_client * client)869 static int mt9m032_remove(struct i2c_client *client)
870 {
871 struct v4l2_subdev *subdev = i2c_get_clientdata(client);
872 struct mt9m032 *sensor = to_mt9m032(subdev);
873
874 v4l2_device_unregister_subdev(subdev);
875 v4l2_ctrl_handler_free(&sensor->ctrls);
876 media_entity_cleanup(&subdev->entity);
877 mutex_destroy(&sensor->lock);
878 return 0;
879 }
880
881 static const struct i2c_device_id mt9m032_id_table[] = {
882 { MT9M032_NAME, 0 },
883 { }
884 };
885
886 MODULE_DEVICE_TABLE(i2c, mt9m032_id_table);
887
888 static struct i2c_driver mt9m032_i2c_driver = {
889 .driver = {
890 .name = MT9M032_NAME,
891 },
892 .probe = mt9m032_probe,
893 .remove = mt9m032_remove,
894 .id_table = mt9m032_id_table,
895 };
896
897 module_i2c_driver(mt9m032_i2c_driver);
898
899 MODULE_AUTHOR("Martin Hostettler <martin@neutronstar.dyndns.org>");
900 MODULE_DESCRIPTION("MT9M032 camera sensor driver");
901 MODULE_LICENSE("GPL v2");
902