1 /*
2 * Driver for MT9T001 CMOS Image Sensor from Aptina (Micron)
3 *
4 * Copyright (C) 2010-2011, Laurent Pinchart <laurent.pinchart@ideasonboard.com>
5 *
6 * Based on the MT9M001 driver,
7 *
8 * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
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/i2c.h>
17 #include <linux/log2.h>
18 #include <linux/module.h>
19 #include <linux/regulator/consumer.h>
20 #include <linux/slab.h>
21 #include <linux/videodev2.h>
22 #include <linux/v4l2-mediabus.h>
23
24 #include <media/mt9t001.h>
25 #include <media/v4l2-ctrls.h>
26 #include <media/v4l2-device.h>
27 #include <media/v4l2-subdev.h>
28
29 #define MT9T001_PIXEL_ARRAY_HEIGHT 1568
30 #define MT9T001_PIXEL_ARRAY_WIDTH 2112
31
32 #define MT9T001_CHIP_VERSION 0x00
33 #define MT9T001_CHIP_ID 0x1621
34 #define MT9T001_ROW_START 0x01
35 #define MT9T001_ROW_START_MIN 0
36 #define MT9T001_ROW_START_DEF 20
37 #define MT9T001_ROW_START_MAX 1534
38 #define MT9T001_COLUMN_START 0x02
39 #define MT9T001_COLUMN_START_MIN 0
40 #define MT9T001_COLUMN_START_DEF 32
41 #define MT9T001_COLUMN_START_MAX 2046
42 #define MT9T001_WINDOW_HEIGHT 0x03
43 #define MT9T001_WINDOW_HEIGHT_MIN 1
44 #define MT9T001_WINDOW_HEIGHT_DEF 1535
45 #define MT9T001_WINDOW_HEIGHT_MAX 1567
46 #define MT9T001_WINDOW_WIDTH 0x04
47 #define MT9T001_WINDOW_WIDTH_MIN 1
48 #define MT9T001_WINDOW_WIDTH_DEF 2047
49 #define MT9T001_WINDOW_WIDTH_MAX 2111
50 #define MT9T001_HORIZONTAL_BLANKING 0x05
51 #define MT9T001_HORIZONTAL_BLANKING_MIN 21
52 #define MT9T001_HORIZONTAL_BLANKING_MAX 1023
53 #define MT9T001_VERTICAL_BLANKING 0x06
54 #define MT9T001_VERTICAL_BLANKING_MIN 3
55 #define MT9T001_VERTICAL_BLANKING_MAX 1023
56 #define MT9T001_OUTPUT_CONTROL 0x07
57 #define MT9T001_OUTPUT_CONTROL_SYNC (1 << 0)
58 #define MT9T001_OUTPUT_CONTROL_CHIP_ENABLE (1 << 1)
59 #define MT9T001_OUTPUT_CONTROL_TEST_DATA (1 << 6)
60 #define MT9T001_OUTPUT_CONTROL_DEF 0x0002
61 #define MT9T001_SHUTTER_WIDTH_HIGH 0x08
62 #define MT9T001_SHUTTER_WIDTH_LOW 0x09
63 #define MT9T001_SHUTTER_WIDTH_MIN 1
64 #define MT9T001_SHUTTER_WIDTH_DEF 1561
65 #define MT9T001_SHUTTER_WIDTH_MAX (1024 * 1024)
66 #define MT9T001_PIXEL_CLOCK 0x0a
67 #define MT9T001_PIXEL_CLOCK_INVERT (1 << 15)
68 #define MT9T001_PIXEL_CLOCK_SHIFT_MASK (7 << 8)
69 #define MT9T001_PIXEL_CLOCK_SHIFT_SHIFT 8
70 #define MT9T001_PIXEL_CLOCK_DIVIDE_MASK (0x7f << 0)
71 #define MT9T001_FRAME_RESTART 0x0b
72 #define MT9T001_SHUTTER_DELAY 0x0c
73 #define MT9T001_SHUTTER_DELAY_MAX 2047
74 #define MT9T001_RESET 0x0d
75 #define MT9T001_READ_MODE1 0x1e
76 #define MT9T001_READ_MODE_SNAPSHOT (1 << 8)
77 #define MT9T001_READ_MODE_STROBE_ENABLE (1 << 9)
78 #define MT9T001_READ_MODE_STROBE_WIDTH (1 << 10)
79 #define MT9T001_READ_MODE_STROBE_OVERRIDE (1 << 11)
80 #define MT9T001_READ_MODE2 0x20
81 #define MT9T001_READ_MODE_BAD_FRAMES (1 << 0)
82 #define MT9T001_READ_MODE_LINE_VALID_CONTINUOUS (1 << 9)
83 #define MT9T001_READ_MODE_LINE_VALID_FRAME (1 << 10)
84 #define MT9T001_READ_MODE3 0x21
85 #define MT9T001_READ_MODE_GLOBAL_RESET (1 << 0)
86 #define MT9T001_READ_MODE_GHST_CTL (1 << 1)
87 #define MT9T001_ROW_ADDRESS_MODE 0x22
88 #define MT9T001_ROW_SKIP_MASK (7 << 0)
89 #define MT9T001_ROW_BIN_MASK (3 << 3)
90 #define MT9T001_ROW_BIN_SHIFT 3
91 #define MT9T001_COLUMN_ADDRESS_MODE 0x23
92 #define MT9T001_COLUMN_SKIP_MASK (7 << 0)
93 #define MT9T001_COLUMN_BIN_MASK (3 << 3)
94 #define MT9T001_COLUMN_BIN_SHIFT 3
95 #define MT9T001_GREEN1_GAIN 0x2b
96 #define MT9T001_BLUE_GAIN 0x2c
97 #define MT9T001_RED_GAIN 0x2d
98 #define MT9T001_GREEN2_GAIN 0x2e
99 #define MT9T001_TEST_DATA 0x32
100 #define MT9T001_GLOBAL_GAIN 0x35
101 #define MT9T001_GLOBAL_GAIN_MIN 8
102 #define MT9T001_GLOBAL_GAIN_MAX 1024
103 #define MT9T001_BLACK_LEVEL 0x49
104 #define MT9T001_ROW_BLACK_DEFAULT_OFFSET 0x4b
105 #define MT9T001_BLC_DELTA_THRESHOLDS 0x5d
106 #define MT9T001_CAL_THRESHOLDS 0x5f
107 #define MT9T001_GREEN1_OFFSET 0x60
108 #define MT9T001_GREEN2_OFFSET 0x61
109 #define MT9T001_BLACK_LEVEL_CALIBRATION 0x62
110 #define MT9T001_BLACK_LEVEL_OVERRIDE (1 << 0)
111 #define MT9T001_BLACK_LEVEL_DISABLE_OFFSET (1 << 1)
112 #define MT9T001_BLACK_LEVEL_RECALCULATE (1 << 12)
113 #define MT9T001_BLACK_LEVEL_LOCK_RED_BLUE (1 << 13)
114 #define MT9T001_BLACK_LEVEL_LOCK_GREEN (1 << 14)
115 #define MT9T001_RED_OFFSET 0x63
116 #define MT9T001_BLUE_OFFSET 0x64
117
118 struct mt9t001 {
119 struct v4l2_subdev subdev;
120 struct media_pad pad;
121
122 struct clk *clk;
123 struct regulator_bulk_data regulators[2];
124
125 struct mutex power_lock; /* lock to protect power_count */
126 int power_count;
127
128 struct v4l2_mbus_framefmt format;
129 struct v4l2_rect crop;
130
131 struct v4l2_ctrl_handler ctrls;
132 struct v4l2_ctrl *gains[4];
133
134 u16 output_control;
135 u16 black_level;
136 };
137
to_mt9t001(struct v4l2_subdev * sd)138 static inline struct mt9t001 *to_mt9t001(struct v4l2_subdev *sd)
139 {
140 return container_of(sd, struct mt9t001, subdev);
141 }
142
mt9t001_read(struct i2c_client * client,u8 reg)143 static int mt9t001_read(struct i2c_client *client, u8 reg)
144 {
145 return i2c_smbus_read_word_swapped(client, reg);
146 }
147
mt9t001_write(struct i2c_client * client,u8 reg,u16 data)148 static int mt9t001_write(struct i2c_client *client, u8 reg, u16 data)
149 {
150 return i2c_smbus_write_word_swapped(client, reg, data);
151 }
152
mt9t001_set_output_control(struct mt9t001 * mt9t001,u16 clear,u16 set)153 static int mt9t001_set_output_control(struct mt9t001 *mt9t001, u16 clear,
154 u16 set)
155 {
156 struct i2c_client *client = v4l2_get_subdevdata(&mt9t001->subdev);
157 u16 value = (mt9t001->output_control & ~clear) | set;
158 int ret;
159
160 if (value == mt9t001->output_control)
161 return 0;
162
163 ret = mt9t001_write(client, MT9T001_OUTPUT_CONTROL, value);
164 if (ret < 0)
165 return ret;
166
167 mt9t001->output_control = value;
168 return 0;
169 }
170
mt9t001_reset(struct mt9t001 * mt9t001)171 static int mt9t001_reset(struct mt9t001 *mt9t001)
172 {
173 struct i2c_client *client = v4l2_get_subdevdata(&mt9t001->subdev);
174 int ret;
175
176 /* Reset the chip and stop data read out */
177 ret = mt9t001_write(client, MT9T001_RESET, 1);
178 if (ret < 0)
179 return ret;
180
181 ret = mt9t001_write(client, MT9T001_RESET, 0);
182 if (ret < 0)
183 return ret;
184
185 mt9t001->output_control = MT9T001_OUTPUT_CONTROL_DEF;
186
187 return mt9t001_set_output_control(mt9t001,
188 MT9T001_OUTPUT_CONTROL_CHIP_ENABLE,
189 0);
190 }
191
mt9t001_power_on(struct mt9t001 * mt9t001)192 static int mt9t001_power_on(struct mt9t001 *mt9t001)
193 {
194 int ret;
195
196 /* Bring up the supplies */
197 ret = regulator_bulk_enable(ARRAY_SIZE(mt9t001->regulators),
198 mt9t001->regulators);
199 if (ret < 0)
200 return ret;
201
202 /* Enable clock */
203 ret = clk_prepare_enable(mt9t001->clk);
204 if (ret < 0)
205 regulator_bulk_disable(ARRAY_SIZE(mt9t001->regulators),
206 mt9t001->regulators);
207
208 return ret;
209 }
210
mt9t001_power_off(struct mt9t001 * mt9t001)211 static void mt9t001_power_off(struct mt9t001 *mt9t001)
212 {
213 regulator_bulk_disable(ARRAY_SIZE(mt9t001->regulators),
214 mt9t001->regulators);
215
216 clk_disable_unprepare(mt9t001->clk);
217 }
218
__mt9t001_set_power(struct mt9t001 * mt9t001,bool on)219 static int __mt9t001_set_power(struct mt9t001 *mt9t001, bool on)
220 {
221 struct i2c_client *client = v4l2_get_subdevdata(&mt9t001->subdev);
222 int ret;
223
224 if (!on) {
225 mt9t001_power_off(mt9t001);
226 return 0;
227 }
228
229 ret = mt9t001_power_on(mt9t001);
230 if (ret < 0)
231 return ret;
232
233 ret = mt9t001_reset(mt9t001);
234 if (ret < 0) {
235 dev_err(&client->dev, "Failed to reset the camera\n");
236 return ret;
237 }
238
239 return v4l2_ctrl_handler_setup(&mt9t001->ctrls);
240 }
241
242 /* -----------------------------------------------------------------------------
243 * V4L2 subdev video operations
244 */
245
246 static struct v4l2_mbus_framefmt *
__mt9t001_get_pad_format(struct mt9t001 * mt9t001,struct v4l2_subdev_pad_config * cfg,unsigned int pad,enum v4l2_subdev_format_whence which)247 __mt9t001_get_pad_format(struct mt9t001 *mt9t001, struct v4l2_subdev_pad_config *cfg,
248 unsigned int pad, enum v4l2_subdev_format_whence which)
249 {
250 switch (which) {
251 case V4L2_SUBDEV_FORMAT_TRY:
252 return v4l2_subdev_get_try_format(&mt9t001->subdev, cfg, pad);
253 case V4L2_SUBDEV_FORMAT_ACTIVE:
254 return &mt9t001->format;
255 default:
256 return NULL;
257 }
258 }
259
260 static struct v4l2_rect *
__mt9t001_get_pad_crop(struct mt9t001 * mt9t001,struct v4l2_subdev_pad_config * cfg,unsigned int pad,enum v4l2_subdev_format_whence which)261 __mt9t001_get_pad_crop(struct mt9t001 *mt9t001, struct v4l2_subdev_pad_config *cfg,
262 unsigned int pad, enum v4l2_subdev_format_whence which)
263 {
264 switch (which) {
265 case V4L2_SUBDEV_FORMAT_TRY:
266 return v4l2_subdev_get_try_crop(&mt9t001->subdev, cfg, pad);
267 case V4L2_SUBDEV_FORMAT_ACTIVE:
268 return &mt9t001->crop;
269 default:
270 return NULL;
271 }
272 }
273
mt9t001_s_stream(struct v4l2_subdev * subdev,int enable)274 static int mt9t001_s_stream(struct v4l2_subdev *subdev, int enable)
275 {
276 const u16 mode = MT9T001_OUTPUT_CONTROL_CHIP_ENABLE;
277 struct i2c_client *client = v4l2_get_subdevdata(subdev);
278 struct mt9t001_platform_data *pdata = client->dev.platform_data;
279 struct mt9t001 *mt9t001 = to_mt9t001(subdev);
280 struct v4l2_mbus_framefmt *format = &mt9t001->format;
281 struct v4l2_rect *crop = &mt9t001->crop;
282 unsigned int hratio;
283 unsigned int vratio;
284 int ret;
285
286 if (!enable)
287 return mt9t001_set_output_control(mt9t001, mode, 0);
288
289 /* Configure the pixel clock polarity */
290 if (pdata->clk_pol) {
291 ret = mt9t001_write(client, MT9T001_PIXEL_CLOCK,
292 MT9T001_PIXEL_CLOCK_INVERT);
293 if (ret < 0)
294 return ret;
295 }
296
297 /* Configure the window size and row/column bin */
298 hratio = DIV_ROUND_CLOSEST(crop->width, format->width);
299 vratio = DIV_ROUND_CLOSEST(crop->height, format->height);
300
301 ret = mt9t001_write(client, MT9T001_ROW_ADDRESS_MODE, hratio - 1);
302 if (ret < 0)
303 return ret;
304
305 ret = mt9t001_write(client, MT9T001_COLUMN_ADDRESS_MODE, vratio - 1);
306 if (ret < 0)
307 return ret;
308
309 ret = mt9t001_write(client, MT9T001_COLUMN_START, crop->left);
310 if (ret < 0)
311 return ret;
312
313 ret = mt9t001_write(client, MT9T001_ROW_START, crop->top);
314 if (ret < 0)
315 return ret;
316
317 ret = mt9t001_write(client, MT9T001_WINDOW_WIDTH, crop->width - 1);
318 if (ret < 0)
319 return ret;
320
321 ret = mt9t001_write(client, MT9T001_WINDOW_HEIGHT, crop->height - 1);
322 if (ret < 0)
323 return ret;
324
325 /* Switch to master "normal" mode */
326 return mt9t001_set_output_control(mt9t001, 0, mode);
327 }
328
mt9t001_enum_mbus_code(struct v4l2_subdev * subdev,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_mbus_code_enum * code)329 static int mt9t001_enum_mbus_code(struct v4l2_subdev *subdev,
330 struct v4l2_subdev_pad_config *cfg,
331 struct v4l2_subdev_mbus_code_enum *code)
332 {
333 if (code->index > 0)
334 return -EINVAL;
335
336 code->code = MEDIA_BUS_FMT_SGRBG10_1X10;
337 return 0;
338 }
339
mt9t001_enum_frame_size(struct v4l2_subdev * subdev,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_frame_size_enum * fse)340 static int mt9t001_enum_frame_size(struct v4l2_subdev *subdev,
341 struct v4l2_subdev_pad_config *cfg,
342 struct v4l2_subdev_frame_size_enum *fse)
343 {
344 if (fse->index >= 8 || fse->code != MEDIA_BUS_FMT_SGRBG10_1X10)
345 return -EINVAL;
346
347 fse->min_width = (MT9T001_WINDOW_WIDTH_DEF + 1) / fse->index;
348 fse->max_width = fse->min_width;
349 fse->min_height = (MT9T001_WINDOW_HEIGHT_DEF + 1) / fse->index;
350 fse->max_height = fse->min_height;
351
352 return 0;
353 }
354
mt9t001_get_format(struct v4l2_subdev * subdev,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_format * format)355 static int mt9t001_get_format(struct v4l2_subdev *subdev,
356 struct v4l2_subdev_pad_config *cfg,
357 struct v4l2_subdev_format *format)
358 {
359 struct mt9t001 *mt9t001 = to_mt9t001(subdev);
360
361 format->format = *__mt9t001_get_pad_format(mt9t001, cfg, format->pad,
362 format->which);
363 return 0;
364 }
365
mt9t001_set_format(struct v4l2_subdev * subdev,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_format * format)366 static int mt9t001_set_format(struct v4l2_subdev *subdev,
367 struct v4l2_subdev_pad_config *cfg,
368 struct v4l2_subdev_format *format)
369 {
370 struct mt9t001 *mt9t001 = to_mt9t001(subdev);
371 struct v4l2_mbus_framefmt *__format;
372 struct v4l2_rect *__crop;
373 unsigned int width;
374 unsigned int height;
375 unsigned int hratio;
376 unsigned int vratio;
377
378 __crop = __mt9t001_get_pad_crop(mt9t001, cfg, format->pad,
379 format->which);
380
381 /* Clamp the width and height to avoid dividing by zero. */
382 width = clamp_t(unsigned int, ALIGN(format->format.width, 2),
383 max_t(unsigned int, __crop->width / 8,
384 MT9T001_WINDOW_HEIGHT_MIN + 1),
385 __crop->width);
386 height = clamp_t(unsigned int, ALIGN(format->format.height, 2),
387 max_t(unsigned int, __crop->height / 8,
388 MT9T001_WINDOW_HEIGHT_MIN + 1),
389 __crop->height);
390
391 hratio = DIV_ROUND_CLOSEST(__crop->width, width);
392 vratio = DIV_ROUND_CLOSEST(__crop->height, height);
393
394 __format = __mt9t001_get_pad_format(mt9t001, cfg, format->pad,
395 format->which);
396 __format->width = __crop->width / hratio;
397 __format->height = __crop->height / vratio;
398
399 format->format = *__format;
400
401 return 0;
402 }
403
mt9t001_get_selection(struct v4l2_subdev * subdev,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_selection * sel)404 static int mt9t001_get_selection(struct v4l2_subdev *subdev,
405 struct v4l2_subdev_pad_config *cfg,
406 struct v4l2_subdev_selection *sel)
407 {
408 struct mt9t001 *mt9t001 = to_mt9t001(subdev);
409
410 if (sel->target != V4L2_SEL_TGT_CROP)
411 return -EINVAL;
412
413 sel->r = *__mt9t001_get_pad_crop(mt9t001, cfg, sel->pad, sel->which);
414 return 0;
415 }
416
mt9t001_set_selection(struct v4l2_subdev * subdev,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_selection * sel)417 static int mt9t001_set_selection(struct v4l2_subdev *subdev,
418 struct v4l2_subdev_pad_config *cfg,
419 struct v4l2_subdev_selection *sel)
420 {
421 struct mt9t001 *mt9t001 = to_mt9t001(subdev);
422 struct v4l2_mbus_framefmt *__format;
423 struct v4l2_rect *__crop;
424 struct v4l2_rect rect;
425
426 if (sel->target != V4L2_SEL_TGT_CROP)
427 return -EINVAL;
428
429 /* Clamp the crop rectangle boundaries and align them to a multiple of 2
430 * pixels.
431 */
432 rect.left = clamp(ALIGN(sel->r.left, 2),
433 MT9T001_COLUMN_START_MIN,
434 MT9T001_COLUMN_START_MAX);
435 rect.top = clamp(ALIGN(sel->r.top, 2),
436 MT9T001_ROW_START_MIN,
437 MT9T001_ROW_START_MAX);
438 rect.width = clamp_t(unsigned int, ALIGN(sel->r.width, 2),
439 MT9T001_WINDOW_WIDTH_MIN + 1,
440 MT9T001_WINDOW_WIDTH_MAX + 1);
441 rect.height = clamp_t(unsigned int, ALIGN(sel->r.height, 2),
442 MT9T001_WINDOW_HEIGHT_MIN + 1,
443 MT9T001_WINDOW_HEIGHT_MAX + 1);
444
445 rect.width = min_t(unsigned int, rect.width,
446 MT9T001_PIXEL_ARRAY_WIDTH - rect.left);
447 rect.height = min_t(unsigned int, rect.height,
448 MT9T001_PIXEL_ARRAY_HEIGHT - rect.top);
449
450 __crop = __mt9t001_get_pad_crop(mt9t001, cfg, sel->pad, sel->which);
451
452 if (rect.width != __crop->width || rect.height != __crop->height) {
453 /* Reset the output image size if the crop rectangle size has
454 * been modified.
455 */
456 __format = __mt9t001_get_pad_format(mt9t001, cfg, sel->pad,
457 sel->which);
458 __format->width = rect.width;
459 __format->height = rect.height;
460 }
461
462 *__crop = rect;
463 sel->r = rect;
464
465 return 0;
466 }
467
468 /* -----------------------------------------------------------------------------
469 * V4L2 subdev control operations
470 */
471
472 #define V4L2_CID_TEST_PATTERN_COLOR (V4L2_CID_USER_BASE | 0x1001)
473 #define V4L2_CID_BLACK_LEVEL_AUTO (V4L2_CID_USER_BASE | 0x1002)
474 #define V4L2_CID_BLACK_LEVEL_OFFSET (V4L2_CID_USER_BASE | 0x1003)
475 #define V4L2_CID_BLACK_LEVEL_CALIBRATE (V4L2_CID_USER_BASE | 0x1004)
476
477 #define V4L2_CID_GAIN_RED (V4L2_CTRL_CLASS_CAMERA | 0x1001)
478 #define V4L2_CID_GAIN_GREEN_RED (V4L2_CTRL_CLASS_CAMERA | 0x1002)
479 #define V4L2_CID_GAIN_GREEN_BLUE (V4L2_CTRL_CLASS_CAMERA | 0x1003)
480 #define V4L2_CID_GAIN_BLUE (V4L2_CTRL_CLASS_CAMERA | 0x1004)
481
mt9t001_gain_value(s32 * gain)482 static u16 mt9t001_gain_value(s32 *gain)
483 {
484 /* Gain is controlled by 2 analog stages and a digital stage. Valid
485 * values for the 3 stages are
486 *
487 * Stage Min Max Step
488 * ------------------------------------------
489 * First analog stage x1 x2 1
490 * Second analog stage x1 x4 0.125
491 * Digital stage x1 x16 0.125
492 *
493 * To minimize noise, the gain stages should be used in the second
494 * analog stage, first analog stage, digital stage order. Gain from a
495 * previous stage should be pushed to its maximum value before the next
496 * stage is used.
497 */
498 if (*gain <= 32)
499 return *gain;
500
501 if (*gain <= 64) {
502 *gain &= ~1;
503 return (1 << 6) | (*gain >> 1);
504 }
505
506 *gain &= ~7;
507 return ((*gain - 64) << 5) | (1 << 6) | 32;
508 }
509
mt9t001_ctrl_freeze(struct mt9t001 * mt9t001,bool freeze)510 static int mt9t001_ctrl_freeze(struct mt9t001 *mt9t001, bool freeze)
511 {
512 return mt9t001_set_output_control(mt9t001,
513 freeze ? 0 : MT9T001_OUTPUT_CONTROL_SYNC,
514 freeze ? MT9T001_OUTPUT_CONTROL_SYNC : 0);
515 }
516
mt9t001_s_ctrl(struct v4l2_ctrl * ctrl)517 static int mt9t001_s_ctrl(struct v4l2_ctrl *ctrl)
518 {
519 static const u8 gains[4] = {
520 MT9T001_RED_GAIN, MT9T001_GREEN1_GAIN,
521 MT9T001_GREEN2_GAIN, MT9T001_BLUE_GAIN
522 };
523
524 struct mt9t001 *mt9t001 =
525 container_of(ctrl->handler, struct mt9t001, ctrls);
526 struct i2c_client *client = v4l2_get_subdevdata(&mt9t001->subdev);
527 unsigned int count;
528 unsigned int i;
529 u16 value;
530 int ret;
531
532 switch (ctrl->id) {
533 case V4L2_CID_GAIN_RED:
534 case V4L2_CID_GAIN_GREEN_RED:
535 case V4L2_CID_GAIN_GREEN_BLUE:
536 case V4L2_CID_GAIN_BLUE:
537
538 /* Disable control updates if more than one control has changed
539 * in the cluster.
540 */
541 for (i = 0, count = 0; i < 4; ++i) {
542 struct v4l2_ctrl *gain = mt9t001->gains[i];
543
544 if (gain->val != gain->cur.val)
545 count++;
546 }
547
548 if (count > 1) {
549 ret = mt9t001_ctrl_freeze(mt9t001, true);
550 if (ret < 0)
551 return ret;
552 }
553
554 /* Update the gain controls. */
555 for (i = 0; i < 4; ++i) {
556 struct v4l2_ctrl *gain = mt9t001->gains[i];
557
558 if (gain->val == gain->cur.val)
559 continue;
560
561 value = mt9t001_gain_value(&gain->val);
562 ret = mt9t001_write(client, gains[i], value);
563 if (ret < 0) {
564 mt9t001_ctrl_freeze(mt9t001, false);
565 return ret;
566 }
567 }
568
569 /* Enable control updates. */
570 if (count > 1) {
571 ret = mt9t001_ctrl_freeze(mt9t001, false);
572 if (ret < 0)
573 return ret;
574 }
575
576 break;
577
578 case V4L2_CID_EXPOSURE:
579 ret = mt9t001_write(client, MT9T001_SHUTTER_WIDTH_LOW,
580 ctrl->val & 0xffff);
581 if (ret < 0)
582 return ret;
583
584 return mt9t001_write(client, MT9T001_SHUTTER_WIDTH_HIGH,
585 ctrl->val >> 16);
586
587 case V4L2_CID_TEST_PATTERN:
588 return mt9t001_set_output_control(mt9t001,
589 ctrl->val ? 0 : MT9T001_OUTPUT_CONTROL_TEST_DATA,
590 ctrl->val ? MT9T001_OUTPUT_CONTROL_TEST_DATA : 0);
591
592 case V4L2_CID_TEST_PATTERN_COLOR:
593 return mt9t001_write(client, MT9T001_TEST_DATA, ctrl->val << 2);
594
595 case V4L2_CID_BLACK_LEVEL_AUTO:
596 value = ctrl->val ? 0 : MT9T001_BLACK_LEVEL_OVERRIDE;
597 ret = mt9t001_write(client, MT9T001_BLACK_LEVEL_CALIBRATION,
598 value);
599 if (ret < 0)
600 return ret;
601
602 mt9t001->black_level = value;
603 break;
604
605 case V4L2_CID_BLACK_LEVEL_OFFSET:
606 ret = mt9t001_write(client, MT9T001_GREEN1_OFFSET, ctrl->val);
607 if (ret < 0)
608 return ret;
609
610 ret = mt9t001_write(client, MT9T001_GREEN2_OFFSET, ctrl->val);
611 if (ret < 0)
612 return ret;
613
614 ret = mt9t001_write(client, MT9T001_RED_OFFSET, ctrl->val);
615 if (ret < 0)
616 return ret;
617
618 return mt9t001_write(client, MT9T001_BLUE_OFFSET, ctrl->val);
619
620 case V4L2_CID_BLACK_LEVEL_CALIBRATE:
621 return mt9t001_write(client, MT9T001_BLACK_LEVEL_CALIBRATION,
622 MT9T001_BLACK_LEVEL_RECALCULATE |
623 mt9t001->black_level);
624 }
625
626 return 0;
627 }
628
629 static struct v4l2_ctrl_ops mt9t001_ctrl_ops = {
630 .s_ctrl = mt9t001_s_ctrl,
631 };
632
633 static const char * const mt9t001_test_pattern_menu[] = {
634 "Disabled",
635 "Enabled",
636 };
637
638 static const struct v4l2_ctrl_config mt9t001_ctrls[] = {
639 {
640 .ops = &mt9t001_ctrl_ops,
641 .id = V4L2_CID_TEST_PATTERN_COLOR,
642 .type = V4L2_CTRL_TYPE_INTEGER,
643 .name = "Test Pattern Color",
644 .min = 0,
645 .max = 1023,
646 .step = 1,
647 .def = 0,
648 .flags = 0,
649 }, {
650 .ops = &mt9t001_ctrl_ops,
651 .id = V4L2_CID_BLACK_LEVEL_AUTO,
652 .type = V4L2_CTRL_TYPE_BOOLEAN,
653 .name = "Black Level, Auto",
654 .min = 0,
655 .max = 1,
656 .step = 1,
657 .def = 1,
658 .flags = 0,
659 }, {
660 .ops = &mt9t001_ctrl_ops,
661 .id = V4L2_CID_BLACK_LEVEL_OFFSET,
662 .type = V4L2_CTRL_TYPE_INTEGER,
663 .name = "Black Level, Offset",
664 .min = -256,
665 .max = 255,
666 .step = 1,
667 .def = 32,
668 .flags = 0,
669 }, {
670 .ops = &mt9t001_ctrl_ops,
671 .id = V4L2_CID_BLACK_LEVEL_CALIBRATE,
672 .type = V4L2_CTRL_TYPE_BUTTON,
673 .name = "Black Level, Calibrate",
674 .min = 0,
675 .max = 0,
676 .step = 0,
677 .def = 0,
678 .flags = V4L2_CTRL_FLAG_WRITE_ONLY,
679 },
680 };
681
682 static const struct v4l2_ctrl_config mt9t001_gains[] = {
683 {
684 .ops = &mt9t001_ctrl_ops,
685 .id = V4L2_CID_GAIN_RED,
686 .type = V4L2_CTRL_TYPE_INTEGER,
687 .name = "Gain, Red",
688 .min = MT9T001_GLOBAL_GAIN_MIN,
689 .max = MT9T001_GLOBAL_GAIN_MAX,
690 .step = 1,
691 .def = MT9T001_GLOBAL_GAIN_MIN,
692 .flags = 0,
693 }, {
694 .ops = &mt9t001_ctrl_ops,
695 .id = V4L2_CID_GAIN_GREEN_RED,
696 .type = V4L2_CTRL_TYPE_INTEGER,
697 .name = "Gain, Green (R)",
698 .min = MT9T001_GLOBAL_GAIN_MIN,
699 .max = MT9T001_GLOBAL_GAIN_MAX,
700 .step = 1,
701 .def = MT9T001_GLOBAL_GAIN_MIN,
702 .flags = 0,
703 }, {
704 .ops = &mt9t001_ctrl_ops,
705 .id = V4L2_CID_GAIN_GREEN_BLUE,
706 .type = V4L2_CTRL_TYPE_INTEGER,
707 .name = "Gain, Green (B)",
708 .min = MT9T001_GLOBAL_GAIN_MIN,
709 .max = MT9T001_GLOBAL_GAIN_MAX,
710 .step = 1,
711 .def = MT9T001_GLOBAL_GAIN_MIN,
712 .flags = 0,
713 }, {
714 .ops = &mt9t001_ctrl_ops,
715 .id = V4L2_CID_GAIN_BLUE,
716 .type = V4L2_CTRL_TYPE_INTEGER,
717 .name = "Gain, Blue",
718 .min = MT9T001_GLOBAL_GAIN_MIN,
719 .max = MT9T001_GLOBAL_GAIN_MAX,
720 .step = 1,
721 .def = MT9T001_GLOBAL_GAIN_MIN,
722 .flags = 0,
723 },
724 };
725
726 /* -----------------------------------------------------------------------------
727 * V4L2 subdev core operations
728 */
729
mt9t001_set_power(struct v4l2_subdev * subdev,int on)730 static int mt9t001_set_power(struct v4l2_subdev *subdev, int on)
731 {
732 struct mt9t001 *mt9t001 = to_mt9t001(subdev);
733 int ret = 0;
734
735 mutex_lock(&mt9t001->power_lock);
736
737 /* If the power count is modified from 0 to != 0 or from != 0 to 0,
738 * update the power state.
739 */
740 if (mt9t001->power_count == !on) {
741 ret = __mt9t001_set_power(mt9t001, !!on);
742 if (ret < 0)
743 goto out;
744 }
745
746 /* Update the power count. */
747 mt9t001->power_count += on ? 1 : -1;
748 WARN_ON(mt9t001->power_count < 0);
749
750 out:
751 mutex_unlock(&mt9t001->power_lock);
752 return ret;
753 }
754
755 /* -----------------------------------------------------------------------------
756 * V4L2 subdev internal operations
757 */
758
mt9t001_registered(struct v4l2_subdev * subdev)759 static int mt9t001_registered(struct v4l2_subdev *subdev)
760 {
761 struct i2c_client *client = v4l2_get_subdevdata(subdev);
762 struct mt9t001 *mt9t001 = to_mt9t001(subdev);
763 s32 data;
764 int ret;
765
766 ret = mt9t001_power_on(mt9t001);
767 if (ret < 0) {
768 dev_err(&client->dev, "MT9T001 power up failed\n");
769 return ret;
770 }
771
772 /* Read out the chip version register */
773 data = mt9t001_read(client, MT9T001_CHIP_VERSION);
774 mt9t001_power_off(mt9t001);
775
776 if (data != MT9T001_CHIP_ID) {
777 dev_err(&client->dev,
778 "MT9T001 not detected, wrong version 0x%04x\n", data);
779 return -ENODEV;
780 }
781
782 dev_info(&client->dev, "MT9T001 detected at address 0x%02x\n",
783 client->addr);
784
785 return 0;
786 }
787
mt9t001_open(struct v4l2_subdev * subdev,struct v4l2_subdev_fh * fh)788 static int mt9t001_open(struct v4l2_subdev *subdev, struct v4l2_subdev_fh *fh)
789 {
790 struct v4l2_mbus_framefmt *format;
791 struct v4l2_rect *crop;
792
793 crop = v4l2_subdev_get_try_crop(subdev, fh->pad, 0);
794 crop->left = MT9T001_COLUMN_START_DEF;
795 crop->top = MT9T001_ROW_START_DEF;
796 crop->width = MT9T001_WINDOW_WIDTH_DEF + 1;
797 crop->height = MT9T001_WINDOW_HEIGHT_DEF + 1;
798
799 format = v4l2_subdev_get_try_format(subdev, fh->pad, 0);
800 format->code = MEDIA_BUS_FMT_SGRBG10_1X10;
801 format->width = MT9T001_WINDOW_WIDTH_DEF + 1;
802 format->height = MT9T001_WINDOW_HEIGHT_DEF + 1;
803 format->field = V4L2_FIELD_NONE;
804 format->colorspace = V4L2_COLORSPACE_SRGB;
805
806 return mt9t001_set_power(subdev, 1);
807 }
808
mt9t001_close(struct v4l2_subdev * subdev,struct v4l2_subdev_fh * fh)809 static int mt9t001_close(struct v4l2_subdev *subdev, struct v4l2_subdev_fh *fh)
810 {
811 return mt9t001_set_power(subdev, 0);
812 }
813
814 static struct v4l2_subdev_core_ops mt9t001_subdev_core_ops = {
815 .s_power = mt9t001_set_power,
816 };
817
818 static struct v4l2_subdev_video_ops mt9t001_subdev_video_ops = {
819 .s_stream = mt9t001_s_stream,
820 };
821
822 static struct v4l2_subdev_pad_ops mt9t001_subdev_pad_ops = {
823 .enum_mbus_code = mt9t001_enum_mbus_code,
824 .enum_frame_size = mt9t001_enum_frame_size,
825 .get_fmt = mt9t001_get_format,
826 .set_fmt = mt9t001_set_format,
827 .get_selection = mt9t001_get_selection,
828 .set_selection = mt9t001_set_selection,
829 };
830
831 static struct v4l2_subdev_ops mt9t001_subdev_ops = {
832 .core = &mt9t001_subdev_core_ops,
833 .video = &mt9t001_subdev_video_ops,
834 .pad = &mt9t001_subdev_pad_ops,
835 };
836
837 static struct v4l2_subdev_internal_ops mt9t001_subdev_internal_ops = {
838 .registered = mt9t001_registered,
839 .open = mt9t001_open,
840 .close = mt9t001_close,
841 };
842
mt9t001_probe(struct i2c_client * client,const struct i2c_device_id * did)843 static int mt9t001_probe(struct i2c_client *client,
844 const struct i2c_device_id *did)
845 {
846 struct mt9t001_platform_data *pdata = client->dev.platform_data;
847 struct mt9t001 *mt9t001;
848 unsigned int i;
849 int ret;
850
851 if (pdata == NULL) {
852 dev_err(&client->dev, "No platform data\n");
853 return -EINVAL;
854 }
855
856 if (!i2c_check_functionality(client->adapter,
857 I2C_FUNC_SMBUS_WORD_DATA)) {
858 dev_warn(&client->adapter->dev,
859 "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
860 return -EIO;
861 }
862
863 mt9t001 = devm_kzalloc(&client->dev, sizeof(*mt9t001), GFP_KERNEL);
864 if (!mt9t001)
865 return -ENOMEM;
866
867 mutex_init(&mt9t001->power_lock);
868 mt9t001->output_control = MT9T001_OUTPUT_CONTROL_DEF;
869
870 mt9t001->regulators[0].supply = "vdd";
871 mt9t001->regulators[1].supply = "vaa";
872
873 ret = devm_regulator_bulk_get(&client->dev, 2, mt9t001->regulators);
874 if (ret < 0) {
875 dev_err(&client->dev, "Unable to get regulators\n");
876 return ret;
877 }
878
879 mt9t001->clk = devm_clk_get(&client->dev, NULL);
880 if (IS_ERR(mt9t001->clk)) {
881 dev_err(&client->dev, "Unable to get clock\n");
882 return PTR_ERR(mt9t001->clk);
883 }
884
885 v4l2_ctrl_handler_init(&mt9t001->ctrls, ARRAY_SIZE(mt9t001_ctrls) +
886 ARRAY_SIZE(mt9t001_gains) + 4);
887
888 v4l2_ctrl_new_std(&mt9t001->ctrls, &mt9t001_ctrl_ops,
889 V4L2_CID_EXPOSURE, MT9T001_SHUTTER_WIDTH_MIN,
890 MT9T001_SHUTTER_WIDTH_MAX, 1,
891 MT9T001_SHUTTER_WIDTH_DEF);
892 v4l2_ctrl_new_std(&mt9t001->ctrls, &mt9t001_ctrl_ops,
893 V4L2_CID_BLACK_LEVEL, 1, 1, 1, 1);
894 v4l2_ctrl_new_std(&mt9t001->ctrls, &mt9t001_ctrl_ops,
895 V4L2_CID_PIXEL_RATE, pdata->ext_clk, pdata->ext_clk,
896 1, pdata->ext_clk);
897 v4l2_ctrl_new_std_menu_items(&mt9t001->ctrls, &mt9t001_ctrl_ops,
898 V4L2_CID_TEST_PATTERN,
899 ARRAY_SIZE(mt9t001_test_pattern_menu) - 1, 0,
900 0, mt9t001_test_pattern_menu);
901
902 for (i = 0; i < ARRAY_SIZE(mt9t001_ctrls); ++i)
903 v4l2_ctrl_new_custom(&mt9t001->ctrls, &mt9t001_ctrls[i], NULL);
904
905 for (i = 0; i < ARRAY_SIZE(mt9t001_gains); ++i)
906 mt9t001->gains[i] = v4l2_ctrl_new_custom(&mt9t001->ctrls,
907 &mt9t001_gains[i], NULL);
908
909 v4l2_ctrl_cluster(ARRAY_SIZE(mt9t001_gains), mt9t001->gains);
910
911 mt9t001->subdev.ctrl_handler = &mt9t001->ctrls;
912
913 if (mt9t001->ctrls.error) {
914 printk(KERN_INFO "%s: control initialization error %d\n",
915 __func__, mt9t001->ctrls.error);
916 ret = -EINVAL;
917 goto done;
918 }
919
920 mt9t001->crop.left = MT9T001_COLUMN_START_DEF;
921 mt9t001->crop.top = MT9T001_ROW_START_DEF;
922 mt9t001->crop.width = MT9T001_WINDOW_WIDTH_DEF + 1;
923 mt9t001->crop.height = MT9T001_WINDOW_HEIGHT_DEF + 1;
924
925 mt9t001->format.code = MEDIA_BUS_FMT_SGRBG10_1X10;
926 mt9t001->format.width = MT9T001_WINDOW_WIDTH_DEF + 1;
927 mt9t001->format.height = MT9T001_WINDOW_HEIGHT_DEF + 1;
928 mt9t001->format.field = V4L2_FIELD_NONE;
929 mt9t001->format.colorspace = V4L2_COLORSPACE_SRGB;
930
931 v4l2_i2c_subdev_init(&mt9t001->subdev, client, &mt9t001_subdev_ops);
932 mt9t001->subdev.internal_ops = &mt9t001_subdev_internal_ops;
933 mt9t001->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
934
935 mt9t001->pad.flags = MEDIA_PAD_FL_SOURCE;
936 ret = media_entity_init(&mt9t001->subdev.entity, 1, &mt9t001->pad, 0);
937
938 done:
939 if (ret < 0) {
940 v4l2_ctrl_handler_free(&mt9t001->ctrls);
941 media_entity_cleanup(&mt9t001->subdev.entity);
942 }
943
944 return ret;
945 }
946
mt9t001_remove(struct i2c_client * client)947 static int mt9t001_remove(struct i2c_client *client)
948 {
949 struct v4l2_subdev *subdev = i2c_get_clientdata(client);
950 struct mt9t001 *mt9t001 = to_mt9t001(subdev);
951
952 v4l2_ctrl_handler_free(&mt9t001->ctrls);
953 v4l2_device_unregister_subdev(subdev);
954 media_entity_cleanup(&subdev->entity);
955 return 0;
956 }
957
958 static const struct i2c_device_id mt9t001_id[] = {
959 { "mt9t001", 0 },
960 { }
961 };
962 MODULE_DEVICE_TABLE(i2c, mt9t001_id);
963
964 static struct i2c_driver mt9t001_driver = {
965 .driver = {
966 .name = "mt9t001",
967 },
968 .probe = mt9t001_probe,
969 .remove = mt9t001_remove,
970 .id_table = mt9t001_id,
971 };
972
973 module_i2c_driver(mt9t001_driver);
974
975 MODULE_DESCRIPTION("Aptina (Micron) MT9T001 Camera driver");
976 MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
977 MODULE_LICENSE("GPL");
978