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[media] include/media: split I2C headers from V4L2 core
[mirror_ubuntu-artful-kernel.git] / drivers / media / i2c / mt9p031.c
1 /*
2 * Driver for MT9P031 CMOS Image Sensor from Aptina
3 *
4 * Copyright (C) 2011, Laurent Pinchart <laurent.pinchart@ideasonboard.com>
5 * Copyright (C) 2011, Javier Martin <javier.martin@vista-silicon.com>
6 * Copyright (C) 2011, Guennadi Liakhovetski <g.liakhovetski@gmx.de>
7 *
8 * Based on the MT9V032 driver and Bastian Hecht's code.
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 */
14
15 #include <linux/clk.h>
16 #include <linux/delay.h>
17 #include <linux/device.h>
18 #include <linux/gpio/consumer.h>
19 #include <linux/i2c.h>
20 #include <linux/log2.h>
21 #include <linux/module.h>
22 #include <linux/of.h>
23 #include <linux/of_graph.h>
24 #include <linux/pm.h>
25 #include <linux/regulator/consumer.h>
26 #include <linux/slab.h>
27 #include <linux/videodev2.h>
28
29 #include <media/i2c/mt9p031.h>
30 #include <media/v4l2-async.h>
31 #include <media/v4l2-ctrls.h>
32 #include <media/v4l2-device.h>
33 #include <media/v4l2-subdev.h>
34
35 #include "aptina-pll.h"
36
37 #define MT9P031_PIXEL_ARRAY_WIDTH 2752
38 #define MT9P031_PIXEL_ARRAY_HEIGHT 2004
39
40 #define MT9P031_CHIP_VERSION 0x00
41 #define MT9P031_CHIP_VERSION_VALUE 0x1801
42 #define MT9P031_ROW_START 0x01
43 #define MT9P031_ROW_START_MIN 0
44 #define MT9P031_ROW_START_MAX 2004
45 #define MT9P031_ROW_START_DEF 54
46 #define MT9P031_COLUMN_START 0x02
47 #define MT9P031_COLUMN_START_MIN 0
48 #define MT9P031_COLUMN_START_MAX 2750
49 #define MT9P031_COLUMN_START_DEF 16
50 #define MT9P031_WINDOW_HEIGHT 0x03
51 #define MT9P031_WINDOW_HEIGHT_MIN 2
52 #define MT9P031_WINDOW_HEIGHT_MAX 2006
53 #define MT9P031_WINDOW_HEIGHT_DEF 1944
54 #define MT9P031_WINDOW_WIDTH 0x04
55 #define MT9P031_WINDOW_WIDTH_MIN 2
56 #define MT9P031_WINDOW_WIDTH_MAX 2752
57 #define MT9P031_WINDOW_WIDTH_DEF 2592
58 #define MT9P031_HORIZONTAL_BLANK 0x05
59 #define MT9P031_HORIZONTAL_BLANK_MIN 0
60 #define MT9P031_HORIZONTAL_BLANK_MAX 4095
61 #define MT9P031_VERTICAL_BLANK 0x06
62 #define MT9P031_VERTICAL_BLANK_MIN 1
63 #define MT9P031_VERTICAL_BLANK_MAX 4096
64 #define MT9P031_VERTICAL_BLANK_DEF 26
65 #define MT9P031_OUTPUT_CONTROL 0x07
66 #define MT9P031_OUTPUT_CONTROL_CEN 2
67 #define MT9P031_OUTPUT_CONTROL_SYN 1
68 #define MT9P031_OUTPUT_CONTROL_DEF 0x1f82
69 #define MT9P031_SHUTTER_WIDTH_UPPER 0x08
70 #define MT9P031_SHUTTER_WIDTH_LOWER 0x09
71 #define MT9P031_SHUTTER_WIDTH_MIN 1
72 #define MT9P031_SHUTTER_WIDTH_MAX 1048575
73 #define MT9P031_SHUTTER_WIDTH_DEF 1943
74 #define MT9P031_PLL_CONTROL 0x10
75 #define MT9P031_PLL_CONTROL_PWROFF 0x0050
76 #define MT9P031_PLL_CONTROL_PWRON 0x0051
77 #define MT9P031_PLL_CONTROL_USEPLL 0x0052
78 #define MT9P031_PLL_CONFIG_1 0x11
79 #define MT9P031_PLL_CONFIG_2 0x12
80 #define MT9P031_PIXEL_CLOCK_CONTROL 0x0a
81 #define MT9P031_PIXEL_CLOCK_INVERT (1 << 15)
82 #define MT9P031_PIXEL_CLOCK_SHIFT(n) ((n) << 8)
83 #define MT9P031_PIXEL_CLOCK_DIVIDE(n) ((n) << 0)
84 #define MT9P031_FRAME_RESTART 0x0b
85 #define MT9P031_SHUTTER_DELAY 0x0c
86 #define MT9P031_RST 0x0d
87 #define MT9P031_RST_ENABLE 1
88 #define MT9P031_RST_DISABLE 0
89 #define MT9P031_READ_MODE_1 0x1e
90 #define MT9P031_READ_MODE_2 0x20
91 #define MT9P031_READ_MODE_2_ROW_MIR (1 << 15)
92 #define MT9P031_READ_MODE_2_COL_MIR (1 << 14)
93 #define MT9P031_READ_MODE_2_ROW_BLC (1 << 6)
94 #define MT9P031_ROW_ADDRESS_MODE 0x22
95 #define MT9P031_COLUMN_ADDRESS_MODE 0x23
96 #define MT9P031_GLOBAL_GAIN 0x35
97 #define MT9P031_GLOBAL_GAIN_MIN 8
98 #define MT9P031_GLOBAL_GAIN_MAX 1024
99 #define MT9P031_GLOBAL_GAIN_DEF 8
100 #define MT9P031_GLOBAL_GAIN_MULT (1 << 6)
101 #define MT9P031_ROW_BLACK_TARGET 0x49
102 #define MT9P031_ROW_BLACK_DEF_OFFSET 0x4b
103 #define MT9P031_GREEN1_OFFSET 0x60
104 #define MT9P031_GREEN2_OFFSET 0x61
105 #define MT9P031_BLACK_LEVEL_CALIBRATION 0x62
106 #define MT9P031_BLC_MANUAL_BLC (1 << 0)
107 #define MT9P031_RED_OFFSET 0x63
108 #define MT9P031_BLUE_OFFSET 0x64
109 #define MT9P031_TEST_PATTERN 0xa0
110 #define MT9P031_TEST_PATTERN_SHIFT 3
111 #define MT9P031_TEST_PATTERN_ENABLE (1 << 0)
112 #define MT9P031_TEST_PATTERN_DISABLE (0 << 0)
113 #define MT9P031_TEST_PATTERN_GREEN 0xa1
114 #define MT9P031_TEST_PATTERN_RED 0xa2
115 #define MT9P031_TEST_PATTERN_BLUE 0xa3
116
117 enum mt9p031_model {
118 MT9P031_MODEL_COLOR,
119 MT9P031_MODEL_MONOCHROME,
120 };
121
122 struct mt9p031 {
123 struct v4l2_subdev subdev;
124 struct media_pad pad;
125 struct v4l2_rect crop; /* Sensor window */
126 struct v4l2_mbus_framefmt format;
127 struct mt9p031_platform_data *pdata;
128 struct mutex power_lock; /* lock to protect power_count */
129 int power_count;
130
131 struct clk *clk;
132 struct regulator_bulk_data regulators[3];
133
134 enum mt9p031_model model;
135 struct aptina_pll pll;
136 unsigned int clk_div;
137 bool use_pll;
138 struct gpio_desc *reset;
139
140 struct v4l2_ctrl_handler ctrls;
141 struct v4l2_ctrl *blc_auto;
142 struct v4l2_ctrl *blc_offset;
143
144 /* Registers cache */
145 u16 output_control;
146 u16 mode2;
147 };
148
149 static struct mt9p031 *to_mt9p031(struct v4l2_subdev *sd)
150 {
151 return container_of(sd, struct mt9p031, subdev);
152 }
153
154 static int mt9p031_read(struct i2c_client *client, u8 reg)
155 {
156 return i2c_smbus_read_word_swapped(client, reg);
157 }
158
159 static int mt9p031_write(struct i2c_client *client, u8 reg, u16 data)
160 {
161 return i2c_smbus_write_word_swapped(client, reg, data);
162 }
163
164 static int mt9p031_set_output_control(struct mt9p031 *mt9p031, u16 clear,
165 u16 set)
166 {
167 struct i2c_client *client = v4l2_get_subdevdata(&mt9p031->subdev);
168 u16 value = (mt9p031->output_control & ~clear) | set;
169 int ret;
170
171 ret = mt9p031_write(client, MT9P031_OUTPUT_CONTROL, value);
172 if (ret < 0)
173 return ret;
174
175 mt9p031->output_control = value;
176 return 0;
177 }
178
179 static int mt9p031_set_mode2(struct mt9p031 *mt9p031, u16 clear, u16 set)
180 {
181 struct i2c_client *client = v4l2_get_subdevdata(&mt9p031->subdev);
182 u16 value = (mt9p031->mode2 & ~clear) | set;
183 int ret;
184
185 ret = mt9p031_write(client, MT9P031_READ_MODE_2, value);
186 if (ret < 0)
187 return ret;
188
189 mt9p031->mode2 = value;
190 return 0;
191 }
192
193 static int mt9p031_reset(struct mt9p031 *mt9p031)
194 {
195 struct i2c_client *client = v4l2_get_subdevdata(&mt9p031->subdev);
196 int ret;
197
198 /* Disable chip output, synchronous option update */
199 ret = mt9p031_write(client, MT9P031_RST, MT9P031_RST_ENABLE);
200 if (ret < 0)
201 return ret;
202 ret = mt9p031_write(client, MT9P031_RST, MT9P031_RST_DISABLE);
203 if (ret < 0)
204 return ret;
205
206 ret = mt9p031_write(client, MT9P031_PIXEL_CLOCK_CONTROL,
207 MT9P031_PIXEL_CLOCK_DIVIDE(mt9p031->clk_div));
208 if (ret < 0)
209 return ret;
210
211 return mt9p031_set_output_control(mt9p031, MT9P031_OUTPUT_CONTROL_CEN,
212 0);
213 }
214
215 static int mt9p031_clk_setup(struct mt9p031 *mt9p031)
216 {
217 static const struct aptina_pll_limits limits = {
218 .ext_clock_min = 6000000,
219 .ext_clock_max = 27000000,
220 .int_clock_min = 2000000,
221 .int_clock_max = 13500000,
222 .out_clock_min = 180000000,
223 .out_clock_max = 360000000,
224 .pix_clock_max = 96000000,
225 .n_min = 1,
226 .n_max = 64,
227 .m_min = 16,
228 .m_max = 255,
229 .p1_min = 1,
230 .p1_max = 128,
231 };
232
233 struct i2c_client *client = v4l2_get_subdevdata(&mt9p031->subdev);
234 struct mt9p031_platform_data *pdata = mt9p031->pdata;
235 int ret;
236
237 mt9p031->clk = devm_clk_get(&client->dev, NULL);
238 if (IS_ERR(mt9p031->clk))
239 return PTR_ERR(mt9p031->clk);
240
241 ret = clk_set_rate(mt9p031->clk, pdata->ext_freq);
242 if (ret < 0)
243 return ret;
244
245 /* If the external clock frequency is out of bounds for the PLL use the
246 * pixel clock divider only and disable the PLL.
247 */
248 if (pdata->ext_freq > limits.ext_clock_max) {
249 unsigned int div;
250
251 div = DIV_ROUND_UP(pdata->ext_freq, pdata->target_freq);
252 div = roundup_pow_of_two(div) / 2;
253
254 mt9p031->clk_div = min_t(unsigned int, div, 64);
255 mt9p031->use_pll = false;
256
257 return 0;
258 }
259
260 mt9p031->pll.ext_clock = pdata->ext_freq;
261 mt9p031->pll.pix_clock = pdata->target_freq;
262 mt9p031->use_pll = true;
263
264 return aptina_pll_calculate(&client->dev, &limits, &mt9p031->pll);
265 }
266
267 static int mt9p031_pll_enable(struct mt9p031 *mt9p031)
268 {
269 struct i2c_client *client = v4l2_get_subdevdata(&mt9p031->subdev);
270 int ret;
271
272 if (!mt9p031->use_pll)
273 return 0;
274
275 ret = mt9p031_write(client, MT9P031_PLL_CONTROL,
276 MT9P031_PLL_CONTROL_PWRON);
277 if (ret < 0)
278 return ret;
279
280 ret = mt9p031_write(client, MT9P031_PLL_CONFIG_1,
281 (mt9p031->pll.m << 8) | (mt9p031->pll.n - 1));
282 if (ret < 0)
283 return ret;
284
285 ret = mt9p031_write(client, MT9P031_PLL_CONFIG_2, mt9p031->pll.p1 - 1);
286 if (ret < 0)
287 return ret;
288
289 usleep_range(1000, 2000);
290 ret = mt9p031_write(client, MT9P031_PLL_CONTROL,
291 MT9P031_PLL_CONTROL_PWRON |
292 MT9P031_PLL_CONTROL_USEPLL);
293 return ret;
294 }
295
296 static inline int mt9p031_pll_disable(struct mt9p031 *mt9p031)
297 {
298 struct i2c_client *client = v4l2_get_subdevdata(&mt9p031->subdev);
299
300 if (!mt9p031->use_pll)
301 return 0;
302
303 return mt9p031_write(client, MT9P031_PLL_CONTROL,
304 MT9P031_PLL_CONTROL_PWROFF);
305 }
306
307 static int mt9p031_power_on(struct mt9p031 *mt9p031)
308 {
309 int ret;
310
311 /* Ensure RESET_BAR is active */
312 if (mt9p031->reset) {
313 gpiod_set_value(mt9p031->reset, 1);
314 usleep_range(1000, 2000);
315 }
316
317 /* Bring up the supplies */
318 ret = regulator_bulk_enable(ARRAY_SIZE(mt9p031->regulators),
319 mt9p031->regulators);
320 if (ret < 0)
321 return ret;
322
323 /* Enable clock */
324 if (mt9p031->clk) {
325 ret = clk_prepare_enable(mt9p031->clk);
326 if (ret) {
327 regulator_bulk_disable(ARRAY_SIZE(mt9p031->regulators),
328 mt9p031->regulators);
329 return ret;
330 }
331 }
332
333 /* Now RESET_BAR must be high */
334 if (mt9p031->reset) {
335 gpiod_set_value(mt9p031->reset, 0);
336 usleep_range(1000, 2000);
337 }
338
339 return 0;
340 }
341
342 static void mt9p031_power_off(struct mt9p031 *mt9p031)
343 {
344 if (mt9p031->reset) {
345 gpiod_set_value(mt9p031->reset, 1);
346 usleep_range(1000, 2000);
347 }
348
349 regulator_bulk_disable(ARRAY_SIZE(mt9p031->regulators),
350 mt9p031->regulators);
351
352 if (mt9p031->clk)
353 clk_disable_unprepare(mt9p031->clk);
354 }
355
356 static int __mt9p031_set_power(struct mt9p031 *mt9p031, bool on)
357 {
358 struct i2c_client *client = v4l2_get_subdevdata(&mt9p031->subdev);
359 int ret;
360
361 if (!on) {
362 mt9p031_power_off(mt9p031);
363 return 0;
364 }
365
366 ret = mt9p031_power_on(mt9p031);
367 if (ret < 0)
368 return ret;
369
370 ret = mt9p031_reset(mt9p031);
371 if (ret < 0) {
372 dev_err(&client->dev, "Failed to reset the camera\n");
373 return ret;
374 }
375
376 return v4l2_ctrl_handler_setup(&mt9p031->ctrls);
377 }
378
379 /* -----------------------------------------------------------------------------
380 * V4L2 subdev video operations
381 */
382
383 static int mt9p031_set_params(struct mt9p031 *mt9p031)
384 {
385 struct i2c_client *client = v4l2_get_subdevdata(&mt9p031->subdev);
386 struct v4l2_mbus_framefmt *format = &mt9p031->format;
387 const struct v4l2_rect *crop = &mt9p031->crop;
388 unsigned int hblank;
389 unsigned int vblank;
390 unsigned int xskip;
391 unsigned int yskip;
392 unsigned int xbin;
393 unsigned int ybin;
394 int ret;
395
396 /* Windows position and size.
397 *
398 * TODO: Make sure the start coordinates and window size match the
399 * skipping, binning and mirroring (see description of registers 2 and 4
400 * in table 13, and Binning section on page 41).
401 */
402 ret = mt9p031_write(client, MT9P031_COLUMN_START, crop->left);
403 if (ret < 0)
404 return ret;
405 ret = mt9p031_write(client, MT9P031_ROW_START, crop->top);
406 if (ret < 0)
407 return ret;
408 ret = mt9p031_write(client, MT9P031_WINDOW_WIDTH, crop->width - 1);
409 if (ret < 0)
410 return ret;
411 ret = mt9p031_write(client, MT9P031_WINDOW_HEIGHT, crop->height - 1);
412 if (ret < 0)
413 return ret;
414
415 /* Row and column binning and skipping. Use the maximum binning value
416 * compatible with the skipping settings.
417 */
418 xskip = DIV_ROUND_CLOSEST(crop->width, format->width);
419 yskip = DIV_ROUND_CLOSEST(crop->height, format->height);
420 xbin = 1 << (ffs(xskip) - 1);
421 ybin = 1 << (ffs(yskip) - 1);
422
423 ret = mt9p031_write(client, MT9P031_COLUMN_ADDRESS_MODE,
424 ((xbin - 1) << 4) | (xskip - 1));
425 if (ret < 0)
426 return ret;
427 ret = mt9p031_write(client, MT9P031_ROW_ADDRESS_MODE,
428 ((ybin - 1) << 4) | (yskip - 1));
429 if (ret < 0)
430 return ret;
431
432 /* Blanking - use minimum value for horizontal blanking and default
433 * value for vertical blanking.
434 */
435 hblank = 346 * ybin + 64 + (80 >> min_t(unsigned int, xbin, 3));
436 vblank = MT9P031_VERTICAL_BLANK_DEF;
437
438 ret = mt9p031_write(client, MT9P031_HORIZONTAL_BLANK, hblank - 1);
439 if (ret < 0)
440 return ret;
441 ret = mt9p031_write(client, MT9P031_VERTICAL_BLANK, vblank - 1);
442 if (ret < 0)
443 return ret;
444
445 return ret;
446 }
447
448 static int mt9p031_s_stream(struct v4l2_subdev *subdev, int enable)
449 {
450 struct mt9p031 *mt9p031 = to_mt9p031(subdev);
451 int ret;
452
453 if (!enable) {
454 /* Stop sensor readout */
455 ret = mt9p031_set_output_control(mt9p031,
456 MT9P031_OUTPUT_CONTROL_CEN, 0);
457 if (ret < 0)
458 return ret;
459
460 return mt9p031_pll_disable(mt9p031);
461 }
462
463 ret = mt9p031_set_params(mt9p031);
464 if (ret < 0)
465 return ret;
466
467 /* Switch to master "normal" mode */
468 ret = mt9p031_set_output_control(mt9p031, 0,
469 MT9P031_OUTPUT_CONTROL_CEN);
470 if (ret < 0)
471 return ret;
472
473 return mt9p031_pll_enable(mt9p031);
474 }
475
476 static int mt9p031_enum_mbus_code(struct v4l2_subdev *subdev,
477 struct v4l2_subdev_pad_config *cfg,
478 struct v4l2_subdev_mbus_code_enum *code)
479 {
480 struct mt9p031 *mt9p031 = to_mt9p031(subdev);
481
482 if (code->pad || code->index)
483 return -EINVAL;
484
485 code->code = mt9p031->format.code;
486 return 0;
487 }
488
489 static int mt9p031_enum_frame_size(struct v4l2_subdev *subdev,
490 struct v4l2_subdev_pad_config *cfg,
491 struct v4l2_subdev_frame_size_enum *fse)
492 {
493 struct mt9p031 *mt9p031 = to_mt9p031(subdev);
494
495 if (fse->index >= 8 || fse->code != mt9p031->format.code)
496 return -EINVAL;
497
498 fse->min_width = MT9P031_WINDOW_WIDTH_DEF
499 / min_t(unsigned int, 7, fse->index + 1);
500 fse->max_width = fse->min_width;
501 fse->min_height = MT9P031_WINDOW_HEIGHT_DEF / (fse->index + 1);
502 fse->max_height = fse->min_height;
503
504 return 0;
505 }
506
507 static struct v4l2_mbus_framefmt *
508 __mt9p031_get_pad_format(struct mt9p031 *mt9p031, struct v4l2_subdev_pad_config *cfg,
509 unsigned int pad, u32 which)
510 {
511 switch (which) {
512 case V4L2_SUBDEV_FORMAT_TRY:
513 return v4l2_subdev_get_try_format(&mt9p031->subdev, cfg, pad);
514 case V4L2_SUBDEV_FORMAT_ACTIVE:
515 return &mt9p031->format;
516 default:
517 return NULL;
518 }
519 }
520
521 static struct v4l2_rect *
522 __mt9p031_get_pad_crop(struct mt9p031 *mt9p031, struct v4l2_subdev_pad_config *cfg,
523 unsigned int pad, u32 which)
524 {
525 switch (which) {
526 case V4L2_SUBDEV_FORMAT_TRY:
527 return v4l2_subdev_get_try_crop(&mt9p031->subdev, cfg, pad);
528 case V4L2_SUBDEV_FORMAT_ACTIVE:
529 return &mt9p031->crop;
530 default:
531 return NULL;
532 }
533 }
534
535 static int mt9p031_get_format(struct v4l2_subdev *subdev,
536 struct v4l2_subdev_pad_config *cfg,
537 struct v4l2_subdev_format *fmt)
538 {
539 struct mt9p031 *mt9p031 = to_mt9p031(subdev);
540
541 fmt->format = *__mt9p031_get_pad_format(mt9p031, cfg, fmt->pad,
542 fmt->which);
543 return 0;
544 }
545
546 static int mt9p031_set_format(struct v4l2_subdev *subdev,
547 struct v4l2_subdev_pad_config *cfg,
548 struct v4l2_subdev_format *format)
549 {
550 struct mt9p031 *mt9p031 = to_mt9p031(subdev);
551 struct v4l2_mbus_framefmt *__format;
552 struct v4l2_rect *__crop;
553 unsigned int width;
554 unsigned int height;
555 unsigned int hratio;
556 unsigned int vratio;
557
558 __crop = __mt9p031_get_pad_crop(mt9p031, cfg, format->pad,
559 format->which);
560
561 /* Clamp the width and height to avoid dividing by zero. */
562 width = clamp_t(unsigned int, ALIGN(format->format.width, 2),
563 max_t(unsigned int, __crop->width / 7,
564 MT9P031_WINDOW_WIDTH_MIN),
565 __crop->width);
566 height = clamp_t(unsigned int, ALIGN(format->format.height, 2),
567 max_t(unsigned int, __crop->height / 8,
568 MT9P031_WINDOW_HEIGHT_MIN),
569 __crop->height);
570
571 hratio = DIV_ROUND_CLOSEST(__crop->width, width);
572 vratio = DIV_ROUND_CLOSEST(__crop->height, height);
573
574 __format = __mt9p031_get_pad_format(mt9p031, cfg, format->pad,
575 format->which);
576 __format->width = __crop->width / hratio;
577 __format->height = __crop->height / vratio;
578
579 format->format = *__format;
580
581 return 0;
582 }
583
584 static int mt9p031_get_selection(struct v4l2_subdev *subdev,
585 struct v4l2_subdev_pad_config *cfg,
586 struct v4l2_subdev_selection *sel)
587 {
588 struct mt9p031 *mt9p031 = to_mt9p031(subdev);
589
590 if (sel->target != V4L2_SEL_TGT_CROP)
591 return -EINVAL;
592
593 sel->r = *__mt9p031_get_pad_crop(mt9p031, cfg, sel->pad, sel->which);
594 return 0;
595 }
596
597 static int mt9p031_set_selection(struct v4l2_subdev *subdev,
598 struct v4l2_subdev_pad_config *cfg,
599 struct v4l2_subdev_selection *sel)
600 {
601 struct mt9p031 *mt9p031 = to_mt9p031(subdev);
602 struct v4l2_mbus_framefmt *__format;
603 struct v4l2_rect *__crop;
604 struct v4l2_rect rect;
605
606 if (sel->target != V4L2_SEL_TGT_CROP)
607 return -EINVAL;
608
609 /* Clamp the crop rectangle boundaries and align them to a multiple of 2
610 * pixels to ensure a GRBG Bayer pattern.
611 */
612 rect.left = clamp(ALIGN(sel->r.left, 2), MT9P031_COLUMN_START_MIN,
613 MT9P031_COLUMN_START_MAX);
614 rect.top = clamp(ALIGN(sel->r.top, 2), MT9P031_ROW_START_MIN,
615 MT9P031_ROW_START_MAX);
616 rect.width = clamp_t(unsigned int, ALIGN(sel->r.width, 2),
617 MT9P031_WINDOW_WIDTH_MIN,
618 MT9P031_WINDOW_WIDTH_MAX);
619 rect.height = clamp_t(unsigned int, ALIGN(sel->r.height, 2),
620 MT9P031_WINDOW_HEIGHT_MIN,
621 MT9P031_WINDOW_HEIGHT_MAX);
622
623 rect.width = min_t(unsigned int, rect.width,
624 MT9P031_PIXEL_ARRAY_WIDTH - rect.left);
625 rect.height = min_t(unsigned int, rect.height,
626 MT9P031_PIXEL_ARRAY_HEIGHT - rect.top);
627
628 __crop = __mt9p031_get_pad_crop(mt9p031, cfg, sel->pad, sel->which);
629
630 if (rect.width != __crop->width || rect.height != __crop->height) {
631 /* Reset the output image size if the crop rectangle size has
632 * been modified.
633 */
634 __format = __mt9p031_get_pad_format(mt9p031, cfg, sel->pad,
635 sel->which);
636 __format->width = rect.width;
637 __format->height = rect.height;
638 }
639
640 *__crop = rect;
641 sel->r = rect;
642
643 return 0;
644 }
645
646 /* -----------------------------------------------------------------------------
647 * V4L2 subdev control operations
648 */
649
650 #define V4L2_CID_BLC_AUTO (V4L2_CID_USER_BASE | 0x1002)
651 #define V4L2_CID_BLC_TARGET_LEVEL (V4L2_CID_USER_BASE | 0x1003)
652 #define V4L2_CID_BLC_ANALOG_OFFSET (V4L2_CID_USER_BASE | 0x1004)
653 #define V4L2_CID_BLC_DIGITAL_OFFSET (V4L2_CID_USER_BASE | 0x1005)
654
655 static int mt9p031_restore_blc(struct mt9p031 *mt9p031)
656 {
657 struct i2c_client *client = v4l2_get_subdevdata(&mt9p031->subdev);
658 int ret;
659
660 if (mt9p031->blc_auto->cur.val != 0) {
661 ret = mt9p031_set_mode2(mt9p031, 0,
662 MT9P031_READ_MODE_2_ROW_BLC);
663 if (ret < 0)
664 return ret;
665 }
666
667 if (mt9p031->blc_offset->cur.val != 0) {
668 ret = mt9p031_write(client, MT9P031_ROW_BLACK_TARGET,
669 mt9p031->blc_offset->cur.val);
670 if (ret < 0)
671 return ret;
672 }
673
674 return 0;
675 }
676
677 static int mt9p031_s_ctrl(struct v4l2_ctrl *ctrl)
678 {
679 struct mt9p031 *mt9p031 =
680 container_of(ctrl->handler, struct mt9p031, ctrls);
681 struct i2c_client *client = v4l2_get_subdevdata(&mt9p031->subdev);
682 u16 data;
683 int ret;
684
685 if (ctrl->flags & V4L2_CTRL_FLAG_INACTIVE)
686 return 0;
687
688 switch (ctrl->id) {
689 case V4L2_CID_EXPOSURE:
690 ret = mt9p031_write(client, MT9P031_SHUTTER_WIDTH_UPPER,
691 (ctrl->val >> 16) & 0xffff);
692 if (ret < 0)
693 return ret;
694
695 return mt9p031_write(client, MT9P031_SHUTTER_WIDTH_LOWER,
696 ctrl->val & 0xffff);
697
698 case V4L2_CID_GAIN:
699 /* Gain is controlled by 2 analog stages and a digital stage.
700 * Valid values for the 3 stages are
701 *
702 * Stage Min Max Step
703 * ------------------------------------------
704 * First analog stage x1 x2 1
705 * Second analog stage x1 x4 0.125
706 * Digital stage x1 x16 0.125
707 *
708 * To minimize noise, the gain stages should be used in the
709 * second analog stage, first analog stage, digital stage order.
710 * Gain from a previous stage should be pushed to its maximum
711 * value before the next stage is used.
712 */
713 if (ctrl->val <= 32) {
714 data = ctrl->val;
715 } else if (ctrl->val <= 64) {
716 ctrl->val &= ~1;
717 data = (1 << 6) | (ctrl->val >> 1);
718 } else {
719 ctrl->val &= ~7;
720 data = ((ctrl->val - 64) << 5) | (1 << 6) | 32;
721 }
722
723 return mt9p031_write(client, MT9P031_GLOBAL_GAIN, data);
724
725 case V4L2_CID_HFLIP:
726 if (ctrl->val)
727 return mt9p031_set_mode2(mt9p031,
728 0, MT9P031_READ_MODE_2_COL_MIR);
729 else
730 return mt9p031_set_mode2(mt9p031,
731 MT9P031_READ_MODE_2_COL_MIR, 0);
732
733 case V4L2_CID_VFLIP:
734 if (ctrl->val)
735 return mt9p031_set_mode2(mt9p031,
736 0, MT9P031_READ_MODE_2_ROW_MIR);
737 else
738 return mt9p031_set_mode2(mt9p031,
739 MT9P031_READ_MODE_2_ROW_MIR, 0);
740
741 case V4L2_CID_TEST_PATTERN:
742 /* The digital side of the Black Level Calibration function must
743 * be disabled when generating a test pattern to avoid artifacts
744 * in the image. Activate (deactivate) the BLC-related controls
745 * when the test pattern is enabled (disabled).
746 */
747 v4l2_ctrl_activate(mt9p031->blc_auto, ctrl->val == 0);
748 v4l2_ctrl_activate(mt9p031->blc_offset, ctrl->val == 0);
749
750 if (!ctrl->val) {
751 /* Restore the BLC settings. */
752 ret = mt9p031_restore_blc(mt9p031);
753 if (ret < 0)
754 return ret;
755
756 return mt9p031_write(client, MT9P031_TEST_PATTERN,
757 MT9P031_TEST_PATTERN_DISABLE);
758 }
759
760 ret = mt9p031_write(client, MT9P031_TEST_PATTERN_GREEN, 0x05a0);
761 if (ret < 0)
762 return ret;
763 ret = mt9p031_write(client, MT9P031_TEST_PATTERN_RED, 0x0a50);
764 if (ret < 0)
765 return ret;
766 ret = mt9p031_write(client, MT9P031_TEST_PATTERN_BLUE, 0x0aa0);
767 if (ret < 0)
768 return ret;
769
770 /* Disable digital BLC when generating a test pattern. */
771 ret = mt9p031_set_mode2(mt9p031, MT9P031_READ_MODE_2_ROW_BLC,
772 0);
773 if (ret < 0)
774 return ret;
775
776 ret = mt9p031_write(client, MT9P031_ROW_BLACK_DEF_OFFSET, 0);
777 if (ret < 0)
778 return ret;
779
780 return mt9p031_write(client, MT9P031_TEST_PATTERN,
781 ((ctrl->val - 1) << MT9P031_TEST_PATTERN_SHIFT)
782 | MT9P031_TEST_PATTERN_ENABLE);
783
784 case V4L2_CID_BLC_AUTO:
785 ret = mt9p031_set_mode2(mt9p031,
786 ctrl->val ? 0 : MT9P031_READ_MODE_2_ROW_BLC,
787 ctrl->val ? MT9P031_READ_MODE_2_ROW_BLC : 0);
788 if (ret < 0)
789 return ret;
790
791 return mt9p031_write(client, MT9P031_BLACK_LEVEL_CALIBRATION,
792 ctrl->val ? 0 : MT9P031_BLC_MANUAL_BLC);
793
794 case V4L2_CID_BLC_TARGET_LEVEL:
795 return mt9p031_write(client, MT9P031_ROW_BLACK_TARGET,
796 ctrl->val);
797
798 case V4L2_CID_BLC_ANALOG_OFFSET:
799 data = ctrl->val & ((1 << 9) - 1);
800
801 ret = mt9p031_write(client, MT9P031_GREEN1_OFFSET, data);
802 if (ret < 0)
803 return ret;
804 ret = mt9p031_write(client, MT9P031_GREEN2_OFFSET, data);
805 if (ret < 0)
806 return ret;
807 ret = mt9p031_write(client, MT9P031_RED_OFFSET, data);
808 if (ret < 0)
809 return ret;
810 return mt9p031_write(client, MT9P031_BLUE_OFFSET, data);
811
812 case V4L2_CID_BLC_DIGITAL_OFFSET:
813 return mt9p031_write(client, MT9P031_ROW_BLACK_DEF_OFFSET,
814 ctrl->val & ((1 << 12) - 1));
815 }
816
817 return 0;
818 }
819
820 static struct v4l2_ctrl_ops mt9p031_ctrl_ops = {
821 .s_ctrl = mt9p031_s_ctrl,
822 };
823
824 static const char * const mt9p031_test_pattern_menu[] = {
825 "Disabled",
826 "Color Field",
827 "Horizontal Gradient",
828 "Vertical Gradient",
829 "Diagonal Gradient",
830 "Classic Test Pattern",
831 "Walking 1s",
832 "Monochrome Horizontal Bars",
833 "Monochrome Vertical Bars",
834 "Vertical Color Bars",
835 };
836
837 static const struct v4l2_ctrl_config mt9p031_ctrls[] = {
838 {
839 .ops = &mt9p031_ctrl_ops,
840 .id = V4L2_CID_BLC_AUTO,
841 .type = V4L2_CTRL_TYPE_BOOLEAN,
842 .name = "BLC, Auto",
843 .min = 0,
844 .max = 1,
845 .step = 1,
846 .def = 1,
847 .flags = 0,
848 }, {
849 .ops = &mt9p031_ctrl_ops,
850 .id = V4L2_CID_BLC_TARGET_LEVEL,
851 .type = V4L2_CTRL_TYPE_INTEGER,
852 .name = "BLC Target Level",
853 .min = 0,
854 .max = 4095,
855 .step = 1,
856 .def = 168,
857 .flags = 0,
858 }, {
859 .ops = &mt9p031_ctrl_ops,
860 .id = V4L2_CID_BLC_ANALOG_OFFSET,
861 .type = V4L2_CTRL_TYPE_INTEGER,
862 .name = "BLC Analog Offset",
863 .min = -255,
864 .max = 255,
865 .step = 1,
866 .def = 32,
867 .flags = 0,
868 }, {
869 .ops = &mt9p031_ctrl_ops,
870 .id = V4L2_CID_BLC_DIGITAL_OFFSET,
871 .type = V4L2_CTRL_TYPE_INTEGER,
872 .name = "BLC Digital Offset",
873 .min = -2048,
874 .max = 2047,
875 .step = 1,
876 .def = 40,
877 .flags = 0,
878 }
879 };
880
881 /* -----------------------------------------------------------------------------
882 * V4L2 subdev core operations
883 */
884
885 static int mt9p031_set_power(struct v4l2_subdev *subdev, int on)
886 {
887 struct mt9p031 *mt9p031 = to_mt9p031(subdev);
888 int ret = 0;
889
890 mutex_lock(&mt9p031->power_lock);
891
892 /* If the power count is modified from 0 to != 0 or from != 0 to 0,
893 * update the power state.
894 */
895 if (mt9p031->power_count == !on) {
896 ret = __mt9p031_set_power(mt9p031, !!on);
897 if (ret < 0)
898 goto out;
899 }
900
901 /* Update the power count. */
902 mt9p031->power_count += on ? 1 : -1;
903 WARN_ON(mt9p031->power_count < 0);
904
905 out:
906 mutex_unlock(&mt9p031->power_lock);
907 return ret;
908 }
909
910 /* -----------------------------------------------------------------------------
911 * V4L2 subdev internal operations
912 */
913
914 static int mt9p031_registered(struct v4l2_subdev *subdev)
915 {
916 struct i2c_client *client = v4l2_get_subdevdata(subdev);
917 struct mt9p031 *mt9p031 = to_mt9p031(subdev);
918 s32 data;
919 int ret;
920
921 ret = mt9p031_power_on(mt9p031);
922 if (ret < 0) {
923 dev_err(&client->dev, "MT9P031 power up failed\n");
924 return ret;
925 }
926
927 /* Read out the chip version register */
928 data = mt9p031_read(client, MT9P031_CHIP_VERSION);
929 mt9p031_power_off(mt9p031);
930
931 if (data != MT9P031_CHIP_VERSION_VALUE) {
932 dev_err(&client->dev, "MT9P031 not detected, wrong version "
933 "0x%04x\n", data);
934 return -ENODEV;
935 }
936
937 dev_info(&client->dev, "MT9P031 detected at address 0x%02x\n",
938 client->addr);
939
940 return 0;
941 }
942
943 static int mt9p031_open(struct v4l2_subdev *subdev, struct v4l2_subdev_fh *fh)
944 {
945 struct mt9p031 *mt9p031 = to_mt9p031(subdev);
946 struct v4l2_mbus_framefmt *format;
947 struct v4l2_rect *crop;
948
949 crop = v4l2_subdev_get_try_crop(subdev, fh->pad, 0);
950 crop->left = MT9P031_COLUMN_START_DEF;
951 crop->top = MT9P031_ROW_START_DEF;
952 crop->width = MT9P031_WINDOW_WIDTH_DEF;
953 crop->height = MT9P031_WINDOW_HEIGHT_DEF;
954
955 format = v4l2_subdev_get_try_format(subdev, fh->pad, 0);
956
957 if (mt9p031->model == MT9P031_MODEL_MONOCHROME)
958 format->code = MEDIA_BUS_FMT_Y12_1X12;
959 else
960 format->code = MEDIA_BUS_FMT_SGRBG12_1X12;
961
962 format->width = MT9P031_WINDOW_WIDTH_DEF;
963 format->height = MT9P031_WINDOW_HEIGHT_DEF;
964 format->field = V4L2_FIELD_NONE;
965 format->colorspace = V4L2_COLORSPACE_SRGB;
966
967 return mt9p031_set_power(subdev, 1);
968 }
969
970 static int mt9p031_close(struct v4l2_subdev *subdev, struct v4l2_subdev_fh *fh)
971 {
972 return mt9p031_set_power(subdev, 0);
973 }
974
975 static struct v4l2_subdev_core_ops mt9p031_subdev_core_ops = {
976 .s_power = mt9p031_set_power,
977 };
978
979 static struct v4l2_subdev_video_ops mt9p031_subdev_video_ops = {
980 .s_stream = mt9p031_s_stream,
981 };
982
983 static struct v4l2_subdev_pad_ops mt9p031_subdev_pad_ops = {
984 .enum_mbus_code = mt9p031_enum_mbus_code,
985 .enum_frame_size = mt9p031_enum_frame_size,
986 .get_fmt = mt9p031_get_format,
987 .set_fmt = mt9p031_set_format,
988 .get_selection = mt9p031_get_selection,
989 .set_selection = mt9p031_set_selection,
990 };
991
992 static struct v4l2_subdev_ops mt9p031_subdev_ops = {
993 .core = &mt9p031_subdev_core_ops,
994 .video = &mt9p031_subdev_video_ops,
995 .pad = &mt9p031_subdev_pad_ops,
996 };
997
998 static const struct v4l2_subdev_internal_ops mt9p031_subdev_internal_ops = {
999 .registered = mt9p031_registered,
1000 .open = mt9p031_open,
1001 .close = mt9p031_close,
1002 };
1003
1004 /* -----------------------------------------------------------------------------
1005 * Driver initialization and probing
1006 */
1007
1008 static struct mt9p031_platform_data *
1009 mt9p031_get_pdata(struct i2c_client *client)
1010 {
1011 struct mt9p031_platform_data *pdata;
1012 struct device_node *np;
1013
1014 if (!IS_ENABLED(CONFIG_OF) || !client->dev.of_node)
1015 return client->dev.platform_data;
1016
1017 np = of_graph_get_next_endpoint(client->dev.of_node, NULL);
1018 if (!np)
1019 return NULL;
1020
1021 pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL);
1022 if (!pdata)
1023 goto done;
1024
1025 of_property_read_u32(np, "input-clock-frequency", &pdata->ext_freq);
1026 of_property_read_u32(np, "pixel-clock-frequency", &pdata->target_freq);
1027
1028 done:
1029 of_node_put(np);
1030 return pdata;
1031 }
1032
1033 static int mt9p031_probe(struct i2c_client *client,
1034 const struct i2c_device_id *did)
1035 {
1036 struct mt9p031_platform_data *pdata = mt9p031_get_pdata(client);
1037 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
1038 struct mt9p031 *mt9p031;
1039 unsigned int i;
1040 int ret;
1041
1042 if (pdata == NULL) {
1043 dev_err(&client->dev, "No platform data\n");
1044 return -EINVAL;
1045 }
1046
1047 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
1048 dev_warn(&client->dev,
1049 "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
1050 return -EIO;
1051 }
1052
1053 mt9p031 = devm_kzalloc(&client->dev, sizeof(*mt9p031), GFP_KERNEL);
1054 if (mt9p031 == NULL)
1055 return -ENOMEM;
1056
1057 mt9p031->pdata = pdata;
1058 mt9p031->output_control = MT9P031_OUTPUT_CONTROL_DEF;
1059 mt9p031->mode2 = MT9P031_READ_MODE_2_ROW_BLC;
1060 mt9p031->model = did->driver_data;
1061
1062 mt9p031->regulators[0].supply = "vdd";
1063 mt9p031->regulators[1].supply = "vdd_io";
1064 mt9p031->regulators[2].supply = "vaa";
1065
1066 ret = devm_regulator_bulk_get(&client->dev, 3, mt9p031->regulators);
1067 if (ret < 0) {
1068 dev_err(&client->dev, "Unable to get regulators\n");
1069 return ret;
1070 }
1071
1072 mutex_init(&mt9p031->power_lock);
1073
1074 v4l2_ctrl_handler_init(&mt9p031->ctrls, ARRAY_SIZE(mt9p031_ctrls) + 6);
1075
1076 v4l2_ctrl_new_std(&mt9p031->ctrls, &mt9p031_ctrl_ops,
1077 V4L2_CID_EXPOSURE, MT9P031_SHUTTER_WIDTH_MIN,
1078 MT9P031_SHUTTER_WIDTH_MAX, 1,
1079 MT9P031_SHUTTER_WIDTH_DEF);
1080 v4l2_ctrl_new_std(&mt9p031->ctrls, &mt9p031_ctrl_ops,
1081 V4L2_CID_GAIN, MT9P031_GLOBAL_GAIN_MIN,
1082 MT9P031_GLOBAL_GAIN_MAX, 1, MT9P031_GLOBAL_GAIN_DEF);
1083 v4l2_ctrl_new_std(&mt9p031->ctrls, &mt9p031_ctrl_ops,
1084 V4L2_CID_HFLIP, 0, 1, 1, 0);
1085 v4l2_ctrl_new_std(&mt9p031->ctrls, &mt9p031_ctrl_ops,
1086 V4L2_CID_VFLIP, 0, 1, 1, 0);
1087 v4l2_ctrl_new_std(&mt9p031->ctrls, &mt9p031_ctrl_ops,
1088 V4L2_CID_PIXEL_RATE, pdata->target_freq,
1089 pdata->target_freq, 1, pdata->target_freq);
1090 v4l2_ctrl_new_std_menu_items(&mt9p031->ctrls, &mt9p031_ctrl_ops,
1091 V4L2_CID_TEST_PATTERN,
1092 ARRAY_SIZE(mt9p031_test_pattern_menu) - 1, 0,
1093 0, mt9p031_test_pattern_menu);
1094
1095 for (i = 0; i < ARRAY_SIZE(mt9p031_ctrls); ++i)
1096 v4l2_ctrl_new_custom(&mt9p031->ctrls, &mt9p031_ctrls[i], NULL);
1097
1098 mt9p031->subdev.ctrl_handler = &mt9p031->ctrls;
1099
1100 if (mt9p031->ctrls.error) {
1101 printk(KERN_INFO "%s: control initialization error %d\n",
1102 __func__, mt9p031->ctrls.error);
1103 ret = mt9p031->ctrls.error;
1104 goto done;
1105 }
1106
1107 mt9p031->blc_auto = v4l2_ctrl_find(&mt9p031->ctrls, V4L2_CID_BLC_AUTO);
1108 mt9p031->blc_offset = v4l2_ctrl_find(&mt9p031->ctrls,
1109 V4L2_CID_BLC_DIGITAL_OFFSET);
1110
1111 v4l2_i2c_subdev_init(&mt9p031->subdev, client, &mt9p031_subdev_ops);
1112 mt9p031->subdev.internal_ops = &mt9p031_subdev_internal_ops;
1113
1114 mt9p031->pad.flags = MEDIA_PAD_FL_SOURCE;
1115 ret = media_entity_init(&mt9p031->subdev.entity, 1, &mt9p031->pad, 0);
1116 if (ret < 0)
1117 goto done;
1118
1119 mt9p031->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
1120
1121 mt9p031->crop.width = MT9P031_WINDOW_WIDTH_DEF;
1122 mt9p031->crop.height = MT9P031_WINDOW_HEIGHT_DEF;
1123 mt9p031->crop.left = MT9P031_COLUMN_START_DEF;
1124 mt9p031->crop.top = MT9P031_ROW_START_DEF;
1125
1126 if (mt9p031->model == MT9P031_MODEL_MONOCHROME)
1127 mt9p031->format.code = MEDIA_BUS_FMT_Y12_1X12;
1128 else
1129 mt9p031->format.code = MEDIA_BUS_FMT_SGRBG12_1X12;
1130
1131 mt9p031->format.width = MT9P031_WINDOW_WIDTH_DEF;
1132 mt9p031->format.height = MT9P031_WINDOW_HEIGHT_DEF;
1133 mt9p031->format.field = V4L2_FIELD_NONE;
1134 mt9p031->format.colorspace = V4L2_COLORSPACE_SRGB;
1135
1136 mt9p031->reset = devm_gpiod_get_optional(&client->dev, "reset",
1137 GPIOD_OUT_HIGH);
1138
1139 ret = mt9p031_clk_setup(mt9p031);
1140 if (ret)
1141 goto done;
1142
1143 ret = v4l2_async_register_subdev(&mt9p031->subdev);
1144
1145 done:
1146 if (ret < 0) {
1147 v4l2_ctrl_handler_free(&mt9p031->ctrls);
1148 media_entity_cleanup(&mt9p031->subdev.entity);
1149 mutex_destroy(&mt9p031->power_lock);
1150 }
1151
1152 return ret;
1153 }
1154
1155 static int mt9p031_remove(struct i2c_client *client)
1156 {
1157 struct v4l2_subdev *subdev = i2c_get_clientdata(client);
1158 struct mt9p031 *mt9p031 = to_mt9p031(subdev);
1159
1160 v4l2_ctrl_handler_free(&mt9p031->ctrls);
1161 v4l2_async_unregister_subdev(subdev);
1162 media_entity_cleanup(&subdev->entity);
1163 mutex_destroy(&mt9p031->power_lock);
1164
1165 return 0;
1166 }
1167
1168 static const struct i2c_device_id mt9p031_id[] = {
1169 { "mt9p031", MT9P031_MODEL_COLOR },
1170 { "mt9p031m", MT9P031_MODEL_MONOCHROME },
1171 { }
1172 };
1173 MODULE_DEVICE_TABLE(i2c, mt9p031_id);
1174
1175 #if IS_ENABLED(CONFIG_OF)
1176 static const struct of_device_id mt9p031_of_match[] = {
1177 { .compatible = "aptina,mt9p031", },
1178 { .compatible = "aptina,mt9p031m", },
1179 { /* sentinel */ },
1180 };
1181 MODULE_DEVICE_TABLE(of, mt9p031_of_match);
1182 #endif
1183
1184 static struct i2c_driver mt9p031_i2c_driver = {
1185 .driver = {
1186 .of_match_table = of_match_ptr(mt9p031_of_match),
1187 .name = "mt9p031",
1188 },
1189 .probe = mt9p031_probe,
1190 .remove = mt9p031_remove,
1191 .id_table = mt9p031_id,
1192 };
1193
1194 module_i2c_driver(mt9p031_i2c_driver);
1195
1196 MODULE_DESCRIPTION("Aptina MT9P031 Camera driver");
1197 MODULE_AUTHOR("Bastian Hecht <hechtb@gmail.com>");
1198 MODULE_LICENSE("GPL v2");
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