?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
repo init
[linux-rt-nao.git] / drivers / media / video / mt9v022.c
blobb04c8cb1644d1193cf3d59ef7b6df597fb7b6933
1 /*
2 * Driver for MT9V022 CMOS Image Sensor from Micron
3 *
4 * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11 #include <linux/videodev2.h>
12 #include <linux/slab.h>
13 #include <linux/i2c.h>
14 #include <linux/delay.h>
15 #include <linux/log2.h>
16 #include <linux/gpio.h>
17
18 #include <media/v4l2-common.h>
19 #include <media/v4l2-chip-ident.h>
20 #include <media/soc_camera.h>
21
22 /* mt9v022 i2c address 0x48, 0x4c, 0x58, 0x5c
23 * The platform has to define i2c_board_info
24 * and call i2c_register_board_info() */
25
26 static char *sensor_type;
27 module_param(sensor_type, charp, S_IRUGO);
28 MODULE_PARM_DESC(sensor_type, "Sensor type: \"colour\" or \"monochrome\"");
29
30 /* mt9v022 selected register addresses */
31 #define MT9V022_CHIP_VERSION 0x00
32 #define MT9V022_COLUMN_START 0x01
33 #define MT9V022_ROW_START 0x02
34 #define MT9V022_WINDOW_HEIGHT 0x03
35 #define MT9V022_WINDOW_WIDTH 0x04
36 #define MT9V022_HORIZONTAL_BLANKING 0x05
37 #define MT9V022_VERTICAL_BLANKING 0x06
38 #define MT9V022_CHIP_CONTROL 0x07
39 #define MT9V022_SHUTTER_WIDTH1 0x08
40 #define MT9V022_SHUTTER_WIDTH2 0x09
41 #define MT9V022_SHUTTER_WIDTH_CTRL 0x0a
42 #define MT9V022_TOTAL_SHUTTER_WIDTH 0x0b
43 #define MT9V022_RESET 0x0c
44 #define MT9V022_READ_MODE 0x0d
45 #define MT9V022_MONITOR_MODE 0x0e
46 #define MT9V022_PIXEL_OPERATION_MODE 0x0f
47 #define MT9V022_LED_OUT_CONTROL 0x1b
48 #define MT9V022_ADC_MODE_CONTROL 0x1c
49 #define MT9V022_ANALOG_GAIN 0x34
50 #define MT9V022_BLACK_LEVEL_CALIB_CTRL 0x47
51 #define MT9V022_PIXCLK_FV_LV 0x74
52 #define MT9V022_DIGITAL_TEST_PATTERN 0x7f
53 #define MT9V022_AEC_AGC_ENABLE 0xAF
54 #define MT9V022_MAX_TOTAL_SHUTTER_WIDTH 0xBD
55
56 /* Progressive scan, master, defaults */
57 #define MT9V022_CHIP_CONTROL_DEFAULT 0x188
58
59 static const struct soc_camera_data_format mt9v022_colour_formats[] = {
60 /* Order important: first natively supported,
61 * second supported with a GPIO extender */
62 {
63 .name = "Bayer (sRGB) 10 bit",
64 .depth = 10,
65 .fourcc = V4L2_PIX_FMT_SBGGR16,
66 .colorspace = V4L2_COLORSPACE_SRGB,
67 }, {
68 .name = "Bayer (sRGB) 8 bit",
69 .depth = 8,
70 .fourcc = V4L2_PIX_FMT_SBGGR8,
71 .colorspace = V4L2_COLORSPACE_SRGB,
72 }
73 };
74
75 static const struct soc_camera_data_format mt9v022_monochrome_formats[] = {
76 /* Order important - see above */
77 {
78 .name = "Monochrome 10 bit",
79 .depth = 10,
80 .fourcc = V4L2_PIX_FMT_Y16,
81 }, {
82 .name = "Monochrome 8 bit",
83 .depth = 8,
84 .fourcc = V4L2_PIX_FMT_GREY,
85 },
86 };
87
88 struct mt9v022 {
89 struct i2c_client *client;
90 struct soc_camera_device icd;
91 int model; /* V4L2_IDENT_MT9V022* codes from v4l2-chip-ident.h */
92 int switch_gpio;
93 u16 chip_control;
94 unsigned char datawidth;
95 };
96
97 static int reg_read(struct soc_camera_device *icd, const u8 reg)
98 {
99 struct mt9v022 *mt9v022 = container_of(icd, struct mt9v022, icd);
100 struct i2c_client *client = mt9v022->client;
101 s32 data = i2c_smbus_read_word_data(client, reg);
102 return data < 0 ? data : swab16(data);
103 }
104
105 static int reg_write(struct soc_camera_device *icd, const u8 reg,
106 const u16 data)
107 {
108 struct mt9v022 *mt9v022 = container_of(icd, struct mt9v022, icd);
109 return i2c_smbus_write_word_data(mt9v022->client, reg, swab16(data));
110 }
111
112 static int reg_set(struct soc_camera_device *icd, const u8 reg,
113 const u16 data)
114 {
115 int ret;
116
117 ret = reg_read(icd, reg);
118 if (ret < 0)
119 return ret;
120 return reg_write(icd, reg, ret | data);
121 }
122
123 static int reg_clear(struct soc_camera_device *icd, const u8 reg,
124 const u16 data)
125 {
126 int ret;
127
128 ret = reg_read(icd, reg);
129 if (ret < 0)
130 return ret;
131 return reg_write(icd, reg, ret & ~data);
132 }
133
134 static int mt9v022_init(struct soc_camera_device *icd)
135 {
136 struct mt9v022 *mt9v022 = container_of(icd, struct mt9v022, icd);
137 struct soc_camera_link *icl = mt9v022->client->dev.platform_data;
138 int ret;
139
140 if (icl->power) {
141 ret = icl->power(&mt9v022->client->dev, 1);
142 if (ret < 0) {
143 dev_err(icd->vdev->parent,
144 "Platform failed to power-on the camera.\n");
145 return ret;
146 }
147 }
148
149 /*
150 * The camera could have been already on, we hard-reset it additionally,
151 * if available. Soft reset is done in video_probe().
152 */
153 if (icl->reset)
154 icl->reset(&mt9v022->client->dev);
155
156 /* Almost the default mode: master, parallel, simultaneous, and an
157 * undocumented bit 0x200, which is present in table 7, but not in 8,
158 * plus snapshot mode to disable scan for now */
159 mt9v022->chip_control |= 0x10;
160 ret = reg_write(icd, MT9V022_CHIP_CONTROL, mt9v022->chip_control);
161 if (!ret)
162 ret = reg_write(icd, MT9V022_READ_MODE, 0x300);
163
164 /* All defaults */
165 if (!ret)
166 /* AEC, AGC on */
167 ret = reg_set(icd, MT9V022_AEC_AGC_ENABLE, 0x3);
168 if (!ret)
169 ret = reg_write(icd, MT9V022_MAX_TOTAL_SHUTTER_WIDTH, 480);
170 if (!ret)
171 /* default - auto */
172 ret = reg_clear(icd, MT9V022_BLACK_LEVEL_CALIB_CTRL, 1);
173 if (!ret)
174 ret = reg_write(icd, MT9V022_DIGITAL_TEST_PATTERN, 0);
175
176 return ret;
177 }
178
179 static int mt9v022_release(struct soc_camera_device *icd)
180 {
181 struct mt9v022 *mt9v022 = container_of(icd, struct mt9v022, icd);
182 struct soc_camera_link *icl = mt9v022->client->dev.platform_data;
183
184 if (icl->power)
185 icl->power(&mt9v022->client->dev, 0);
186
187 return 0;
188 }
189
190 static int mt9v022_start_capture(struct soc_camera_device *icd)
191 {
192 struct mt9v022 *mt9v022 = container_of(icd, struct mt9v022, icd);
193 /* Switch to master "normal" mode */
194 mt9v022->chip_control &= ~0x10;
195 if (reg_write(icd, MT9V022_CHIP_CONTROL,
196 mt9v022->chip_control) < 0)
197 return -EIO;
198 return 0;
199 }
200
201 static int mt9v022_stop_capture(struct soc_camera_device *icd)
202 {
203 struct mt9v022 *mt9v022 = container_of(icd, struct mt9v022, icd);
204 /* Switch to snapshot mode */
205 mt9v022->chip_control |= 0x10;
206 if (reg_write(icd, MT9V022_CHIP_CONTROL,
207 mt9v022->chip_control) < 0)
208 return -EIO;
209 return 0;
210 }
211
212 static int bus_switch_request(struct mt9v022 *mt9v022, struct soc_camera_link *icl)
213 {
214 #ifdef CONFIG_MT9V022_PCA9536_SWITCH
215 int ret;
216 unsigned int gpio = icl->gpio;
217
218 if (gpio_is_valid(gpio)) {
219 /* We have a data bus switch. */
220 ret = gpio_request(gpio, "mt9v022");
221 if (ret < 0) {
222 dev_err(&mt9v022->client->dev, "Cannot get GPIO %u\n", gpio);
223 return ret;
224 }
225
226 ret = gpio_direction_output(gpio, 0);
227 if (ret < 0) {
228 dev_err(&mt9v022->client->dev,
229 "Cannot set GPIO %u to output\n", gpio);
230 gpio_free(gpio);
231 return ret;
232 }
233 }
234
235 mt9v022->switch_gpio = gpio;
236 #else
237 mt9v022->switch_gpio = -EINVAL;
238 #endif
239 return 0;
240 }
241
242 static void bus_switch_release(struct mt9v022 *mt9v022)
243 {
244 #ifdef CONFIG_MT9V022_PCA9536_SWITCH
245 if (gpio_is_valid(mt9v022->switch_gpio))
246 gpio_free(mt9v022->switch_gpio);
247 #endif
248 }
249
250 static int bus_switch_act(struct mt9v022 *mt9v022, int go8bit)
251 {
252 #ifdef CONFIG_MT9V022_PCA9536_SWITCH
253 if (!gpio_is_valid(mt9v022->switch_gpio))
254 return -ENODEV;
255
256 gpio_set_value_cansleep(mt9v022->switch_gpio, go8bit);
257 return 0;
258 #else
259 return -ENODEV;
260 #endif
261 }
262
263 static int bus_switch_possible(struct mt9v022 *mt9v022)
264 {
265 #ifdef CONFIG_MT9V022_PCA9536_SWITCH
266 return gpio_is_valid(mt9v022->switch_gpio);
267 #else
268 return 0;
269 #endif
270 }
271
272 static int mt9v022_set_bus_param(struct soc_camera_device *icd,
273 unsigned long flags)
274 {
275 struct mt9v022 *mt9v022 = container_of(icd, struct mt9v022, icd);
276 struct soc_camera_link *icl = mt9v022->client->dev.platform_data;
277 unsigned int width_flag = flags & SOCAM_DATAWIDTH_MASK;
278 int ret;
279 u16 pixclk = 0;
280
281 /* Only one width bit may be set */
282 if (!is_power_of_2(width_flag))
283 return -EINVAL;
284
285 if ((mt9v022->datawidth != 10 && (width_flag == SOCAM_DATAWIDTH_10)) ||
286 (mt9v022->datawidth != 9 && (width_flag == SOCAM_DATAWIDTH_9)) ||
287 (mt9v022->datawidth != 8 && (width_flag == SOCAM_DATAWIDTH_8))) {
288 /* Well, we actually only can do 10 or 8 bits... */
289 if (width_flag == SOCAM_DATAWIDTH_9)
290 return -EINVAL;
291
292 ret = bus_switch_act(mt9v022,
293 width_flag == SOCAM_DATAWIDTH_8);
294 if (ret < 0)
295 return ret;
296
297 mt9v022->datawidth = width_flag == SOCAM_DATAWIDTH_8 ? 8 : 10;
298 }
299
300 flags = soc_camera_apply_sensor_flags(icl, flags);
301
302 if (flags & SOCAM_PCLK_SAMPLE_RISING)
303 pixclk |= 0x10;
304
305 if (!(flags & SOCAM_HSYNC_ACTIVE_HIGH))
306 pixclk |= 0x1;
307
308 if (!(flags & SOCAM_VSYNC_ACTIVE_HIGH))
309 pixclk |= 0x2;
310
311 ret = reg_write(icd, MT9V022_PIXCLK_FV_LV, pixclk);
312 if (ret < 0)
313 return ret;
314
315 if (!(flags & SOCAM_MASTER))
316 mt9v022->chip_control &= ~0x8;
317
318 ret = reg_write(icd, MT9V022_CHIP_CONTROL, mt9v022->chip_control);
319 if (ret < 0)
320 return ret;
321
322 dev_dbg(&icd->dev, "Calculated pixclk 0x%x, chip control 0x%x\n",
323 pixclk, mt9v022->chip_control);
324
325 return 0;
326 }
327
328 static unsigned long mt9v022_query_bus_param(struct soc_camera_device *icd)
329 {
330 struct mt9v022 *mt9v022 = container_of(icd, struct mt9v022, icd);
331 unsigned int width_flag = SOCAM_DATAWIDTH_10;
332
333 if (bus_switch_possible(mt9v022))
334 width_flag |= SOCAM_DATAWIDTH_8;
335
336 return SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING |
337 SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_HSYNC_ACTIVE_LOW |
338 SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_LOW |
339 SOCAM_MASTER | SOCAM_SLAVE |
340 width_flag;
341 }
342
343 static int mt9v022_set_fmt(struct soc_camera_device *icd,
344 __u32 pixfmt, struct v4l2_rect *rect)
345 {
346 struct mt9v022 *mt9v022 = container_of(icd, struct mt9v022, icd);
347 int ret;
348
349 /* The caller provides a supported format, as verified per call to
350 * icd->try_fmt(), datawidth is from our supported format list */
351 switch (pixfmt) {
352 case V4L2_PIX_FMT_GREY:
353 case V4L2_PIX_FMT_Y16:
354 if (mt9v022->model != V4L2_IDENT_MT9V022IX7ATM)
355 return -EINVAL;
356 break;
357 case V4L2_PIX_FMT_SBGGR8:
358 case V4L2_PIX_FMT_SBGGR16:
359 if (mt9v022->model != V4L2_IDENT_MT9V022IX7ATC)
360 return -EINVAL;
361 break;
362 case 0:
363 /* No format change, only geometry */
364 break;
365 default:
366 return -EINVAL;
367 }
368
369 /* Like in example app. Contradicts the datasheet though */
370 ret = reg_read(icd, MT9V022_AEC_AGC_ENABLE);
371 if (ret >= 0) {
372 if (ret & 1) /* Autoexposure */
373 ret = reg_write(icd, MT9V022_MAX_TOTAL_SHUTTER_WIDTH,
374 rect->height + icd->y_skip_top + 43);
375 else
376 ret = reg_write(icd, MT9V022_TOTAL_SHUTTER_WIDTH,
377 rect->height + icd->y_skip_top + 43);
378 }
379 /* Setup frame format: defaults apart from width and height */
380 if (!ret)
381 ret = reg_write(icd, MT9V022_COLUMN_START, rect->left);
382 if (!ret)
383 ret = reg_write(icd, MT9V022_ROW_START, rect->top);
384 if (!ret)
385 /* Default 94, Phytec driver says:
386 * "width + horizontal blank >= 660" */
387 ret = reg_write(icd, MT9V022_HORIZONTAL_BLANKING,
388 rect->width > 660 - 43 ? 43 :
389 660 - rect->width);
390 if (!ret)
391 ret = reg_write(icd, MT9V022_VERTICAL_BLANKING, 45);
392 if (!ret)
393 ret = reg_write(icd, MT9V022_WINDOW_WIDTH, rect->width);
394 if (!ret)
395 ret = reg_write(icd, MT9V022_WINDOW_HEIGHT,
396 rect->height + icd->y_skip_top);
397
398 if (ret < 0)
399 return ret;
400
401 dev_dbg(&icd->dev, "Frame %ux%u pixel\n", rect->width, rect->height);
402
403 return 0;
404 }
405
406 static int mt9v022_try_fmt(struct soc_camera_device *icd,
407 struct v4l2_format *f)
408 {
409 struct v4l2_pix_format *pix = &f->fmt.pix;
410
411 if (pix->height < 32 + icd->y_skip_top)
412 pix->height = 32 + icd->y_skip_top;
413 if (pix->height > 480 + icd->y_skip_top)
414 pix->height = 480 + icd->y_skip_top;
415 if (pix->width < 48)
416 pix->width = 48;
417 if (pix->width > 752)
418 pix->width = 752;
419 pix->width &= ~0x03; /* ? */
420
421 return 0;
422 }
423
424 static int mt9v022_get_chip_id(struct soc_camera_device *icd,
425 struct v4l2_dbg_chip_ident *id)
426 {
427 struct mt9v022 *mt9v022 = container_of(icd, struct mt9v022, icd);
428
429 if (id->match.type != V4L2_CHIP_MATCH_I2C_ADDR)
430 return -EINVAL;
431
432 if (id->match.addr != mt9v022->client->addr)
433 return -ENODEV;
434
435 id->ident = mt9v022->model;
436 id->revision = 0;
437
438 return 0;
439 }
440
441 #ifdef CONFIG_VIDEO_ADV_DEBUG
442 static int mt9v022_get_register(struct soc_camera_device *icd,
443 struct v4l2_dbg_register *reg)
444 {
445 struct mt9v022 *mt9v022 = container_of(icd, struct mt9v022, icd);
446
447 if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
448 return -EINVAL;
449
450 if (reg->match.addr != mt9v022->client->addr)
451 return -ENODEV;
452
453 reg->size = 2;
454 reg->val = reg_read(icd, reg->reg);
455
456 if (reg->val > 0xffff)
457 return -EIO;
458
459 return 0;
460 }
461
462 static int mt9v022_set_register(struct soc_camera_device *icd,
463 struct v4l2_dbg_register *reg)
464 {
465 struct mt9v022 *mt9v022 = container_of(icd, struct mt9v022, icd);
466
467 if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
468 return -EINVAL;
469
470 if (reg->match.addr != mt9v022->client->addr)
471 return -ENODEV;
472
473 if (reg_write(icd, reg->reg, reg->val) < 0)
474 return -EIO;
475
476 return 0;
477 }
478 #endif
479
480 static const struct v4l2_queryctrl mt9v022_controls[] = {
481 {
482 .id = V4L2_CID_VFLIP,
483 .type = V4L2_CTRL_TYPE_BOOLEAN,
484 .name = "Flip Vertically",
485 .minimum = 0,
486 .maximum = 1,
487 .step = 1,
488 .default_value = 0,
489 }, {
490 .id = V4L2_CID_HFLIP,
491 .type = V4L2_CTRL_TYPE_BOOLEAN,
492 .name = "Flip Horizontally",
493 .minimum = 0,
494 .maximum = 1,
495 .step = 1,
496 .default_value = 0,
497 }, {
498 .id = V4L2_CID_GAIN,
499 .type = V4L2_CTRL_TYPE_INTEGER,
500 .name = "Analog Gain",
501 .minimum = 64,
502 .maximum = 127,
503 .step = 1,
504 .default_value = 64,
505 .flags = V4L2_CTRL_FLAG_SLIDER,
506 }, {
507 .id = V4L2_CID_EXPOSURE,
508 .type = V4L2_CTRL_TYPE_INTEGER,
509 .name = "Exposure",
510 .minimum = 1,
511 .maximum = 255,
512 .step = 1,
513 .default_value = 255,
514 .flags = V4L2_CTRL_FLAG_SLIDER,
515 }, {
516 .id = V4L2_CID_AUTOGAIN,
517 .type = V4L2_CTRL_TYPE_BOOLEAN,
518 .name = "Automatic Gain",
519 .minimum = 0,
520 .maximum = 1,
521 .step = 1,
522 .default_value = 1,
523 }, {
524 .id = V4L2_CID_EXPOSURE_AUTO,
525 .type = V4L2_CTRL_TYPE_BOOLEAN,
526 .name = "Automatic Exposure",
527 .minimum = 0,
528 .maximum = 1,
529 .step = 1,
530 .default_value = 1,
531 }
532 };
533
534 static int mt9v022_video_probe(struct soc_camera_device *);
535 static void mt9v022_video_remove(struct soc_camera_device *);
536 static int mt9v022_get_control(struct soc_camera_device *, struct v4l2_control *);
537 static int mt9v022_set_control(struct soc_camera_device *, struct v4l2_control *);
538
539 static struct soc_camera_ops mt9v022_ops = {
540 .owner = THIS_MODULE,
541 .probe = mt9v022_video_probe,
542 .remove = mt9v022_video_remove,
543 .init = mt9v022_init,
544 .release = mt9v022_release,
545 .start_capture = mt9v022_start_capture,
546 .stop_capture = mt9v022_stop_capture,
547 .set_fmt = mt9v022_set_fmt,
548 .try_fmt = mt9v022_try_fmt,
549 .set_bus_param = mt9v022_set_bus_param,
550 .query_bus_param = mt9v022_query_bus_param,
551 .controls = mt9v022_controls,
552 .num_controls = ARRAY_SIZE(mt9v022_controls),
553 .get_control = mt9v022_get_control,
554 .set_control = mt9v022_set_control,
555 .get_chip_id = mt9v022_get_chip_id,
556 #ifdef CONFIG_VIDEO_ADV_DEBUG
557 .get_register = mt9v022_get_register,
558 .set_register = mt9v022_set_register,
559 #endif
560 };
561
562 static int mt9v022_get_control(struct soc_camera_device *icd,
563 struct v4l2_control *ctrl)
564 {
565 int data;
566
567 switch (ctrl->id) {
568 case V4L2_CID_VFLIP:
569 data = reg_read(icd, MT9V022_READ_MODE);
570 if (data < 0)
571 return -EIO;
572 ctrl->value = !!(data & 0x10);
573 break;
574 case V4L2_CID_HFLIP:
575 data = reg_read(icd, MT9V022_READ_MODE);
576 if (data < 0)
577 return -EIO;
578 ctrl->value = !!(data & 0x20);
579 break;
580 case V4L2_CID_EXPOSURE_AUTO:
581 data = reg_read(icd, MT9V022_AEC_AGC_ENABLE);
582 if (data < 0)
583 return -EIO;
584 ctrl->value = !!(data & 0x1);
585 break;
586 case V4L2_CID_AUTOGAIN:
587 data = reg_read(icd, MT9V022_AEC_AGC_ENABLE);
588 if (data < 0)
589 return -EIO;
590 ctrl->value = !!(data & 0x2);
591 break;
592 }
593 return 0;
594 }
595
596 static int mt9v022_set_control(struct soc_camera_device *icd,
597 struct v4l2_control *ctrl)
598 {
599 int data;
600 const struct v4l2_queryctrl *qctrl;
601
602 qctrl = soc_camera_find_qctrl(&mt9v022_ops, ctrl->id);
603
604 if (!qctrl)
605 return -EINVAL;
606
607 switch (ctrl->id) {
608 case V4L2_CID_VFLIP:
609 if (ctrl->value)
610 data = reg_set(icd, MT9V022_READ_MODE, 0x10);
611 else
612 data = reg_clear(icd, MT9V022_READ_MODE, 0x10);
613 if (data < 0)
614 return -EIO;
615 break;
616 case V4L2_CID_HFLIP:
617 if (ctrl->value)
618 data = reg_set(icd, MT9V022_READ_MODE, 0x20);
619 else
620 data = reg_clear(icd, MT9V022_READ_MODE, 0x20);
621 if (data < 0)
622 return -EIO;
623 break;
624 case V4L2_CID_GAIN:
625 /* mt9v022 has minimum == default */
626 if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum)
627 return -EINVAL;
628 else {
629 unsigned long range = qctrl->maximum - qctrl->minimum;
630 /* Datasheet says 16 to 64. autogain only works properly
631 * after setting gain to maximum 14. Larger values
632 * produce "white fly" noise effect. On the whole,
633 * manually setting analog gain does no good. */
634 unsigned long gain = ((ctrl->value - qctrl->minimum) *
635 10 + range / 2) / range + 4;
636 if (gain >= 32)
637 gain &= ~1;
638 /* The user wants to set gain manually, hope, she
639 * knows, what she's doing... Switch AGC off. */
640
641 if (reg_clear(icd, MT9V022_AEC_AGC_ENABLE, 0x2) < 0)
642 return -EIO;
643
644 dev_info(&icd->dev, "Setting gain from %d to %lu\n",
645 reg_read(icd, MT9V022_ANALOG_GAIN), gain);
646 if (reg_write(icd, MT9V022_ANALOG_GAIN, gain) < 0)
647 return -EIO;
648 icd->gain = ctrl->value;
649 }
650 break;
651 case V4L2_CID_EXPOSURE:
652 /* mt9v022 has maximum == default */
653 if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum)
654 return -EINVAL;
655 else {
656 unsigned long range = qctrl->maximum - qctrl->minimum;
657 unsigned long shutter = ((ctrl->value - qctrl->minimum) *
658 479 + range / 2) / range + 1;
659 /* The user wants to set shutter width manually, hope,
660 * she knows, what she's doing... Switch AEC off. */
661
662 if (reg_clear(icd, MT9V022_AEC_AGC_ENABLE, 0x1) < 0)
663 return -EIO;
664
665 dev_dbg(&icd->dev, "Shutter width from %d to %lu\n",
666 reg_read(icd, MT9V022_TOTAL_SHUTTER_WIDTH),
667 shutter);
668 if (reg_write(icd, MT9V022_TOTAL_SHUTTER_WIDTH,
669 shutter) < 0)
670 return -EIO;
671 icd->exposure = ctrl->value;
672 }
673 break;
674 case V4L2_CID_AUTOGAIN:
675 if (ctrl->value)
676 data = reg_set(icd, MT9V022_AEC_AGC_ENABLE, 0x2);
677 else
678 data = reg_clear(icd, MT9V022_AEC_AGC_ENABLE, 0x2);
679 if (data < 0)
680 return -EIO;
681 break;
682 case V4L2_CID_EXPOSURE_AUTO:
683 if (ctrl->value)
684 data = reg_set(icd, MT9V022_AEC_AGC_ENABLE, 0x1);
685 else
686 data = reg_clear(icd, MT9V022_AEC_AGC_ENABLE, 0x1);
687 if (data < 0)
688 return -EIO;
689 break;
690 }
691 return 0;
692 }
693
694 /* Interface active, can use i2c. If it fails, it can indeed mean, that
695 * this wasn't our capture interface, so, we wait for the right one */
696 static int mt9v022_video_probe(struct soc_camera_device *icd)
697 {
698 struct mt9v022 *mt9v022 = container_of(icd, struct mt9v022, icd);
699 struct soc_camera_link *icl = mt9v022->client->dev.platform_data;
700 s32 data;
701 int ret;
702
703 if (!icd->dev.parent ||
704 to_soc_camera_host(icd->dev.parent)->nr != icd->iface)
705 return -ENODEV;
706
707 /* Read out the chip version register */
708 data = reg_read(icd, MT9V022_CHIP_VERSION);
709
710 /* must be 0x1311 or 0x1313 */
711 if (data != 0x1311 && data != 0x1313) {
712 ret = -ENODEV;
713 dev_info(&icd->dev, "No MT9V022 detected, ID register 0x%x\n",
714 data);
715 goto ei2c;
716 }
717
718 /* Soft reset */
719 ret = reg_write(icd, MT9V022_RESET, 1);
720 if (ret < 0)
721 goto ei2c;
722 /* 15 clock cycles */
723 udelay(200);
724 if (reg_read(icd, MT9V022_RESET)) {
725 dev_err(&icd->dev, "Resetting MT9V022 failed!\n");
726 goto ei2c;
727 }
728
729 /* Set monochrome or colour sensor type */
730 if (sensor_type && (!strcmp("colour", sensor_type) ||
731 !strcmp("color", sensor_type))) {
732 ret = reg_write(icd, MT9V022_PIXEL_OPERATION_MODE, 4 | 0x11);
733 mt9v022->model = V4L2_IDENT_MT9V022IX7ATC;
734 icd->formats = mt9v022_colour_formats;
735 if (gpio_is_valid(icl->gpio))
736 icd->num_formats = ARRAY_SIZE(mt9v022_colour_formats);
737 else
738 icd->num_formats = 1;
739 } else {
740 ret = reg_write(icd, MT9V022_PIXEL_OPERATION_MODE, 0x11);
741 mt9v022->model = V4L2_IDENT_MT9V022IX7ATM;
742 icd->formats = mt9v022_monochrome_formats;
743 if (gpio_is_valid(icl->gpio))
744 icd->num_formats = ARRAY_SIZE(mt9v022_monochrome_formats);
745 else
746 icd->num_formats = 1;
747 }
748
749 if (!ret)
750 ret = soc_camera_video_start(icd);
751 if (ret < 0)
752 goto eisis;
753
754 dev_info(&icd->dev, "Detected a MT9V022 chip ID %x, %s sensor\n",
755 data, mt9v022->model == V4L2_IDENT_MT9V022IX7ATM ?
756 "monochrome" : "colour");
757
758 return 0;
759
760 eisis:
761 ei2c:
762 return ret;
763 }
764
765 static void mt9v022_video_remove(struct soc_camera_device *icd)
766 {
767 struct mt9v022 *mt9v022 = container_of(icd, struct mt9v022, icd);
768
769 dev_dbg(&icd->dev, "Video %x removed: %p, %p\n", mt9v022->client->addr,
770 icd->dev.parent, icd->vdev);
771 soc_camera_video_stop(icd);
772 }
773
774 static int mt9v022_probe(struct i2c_client *client,
775 const struct i2c_device_id *did)
776 {
777 struct mt9v022 *mt9v022;
778 struct soc_camera_device *icd;
779 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
780 struct soc_camera_link *icl = client->dev.platform_data;
781 int ret;
782
783 if (!icl) {
784 dev_err(&client->dev, "MT9V022 driver needs platform data\n");
785 return -EINVAL;
786 }
787
788 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
789 dev_warn(&adapter->dev,
790 "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
791 return -EIO;
792 }
793
794 mt9v022 = kzalloc(sizeof(struct mt9v022), GFP_KERNEL);
795 if (!mt9v022)
796 return -ENOMEM;
797
798 mt9v022->chip_control = MT9V022_CHIP_CONTROL_DEFAULT;
799 mt9v022->client = client;
800 i2c_set_clientdata(client, mt9v022);
801
802 icd = &mt9v022->icd;
803 icd->ops = &mt9v022_ops;
804 icd->control = &client->dev;
805 icd->x_min = 1;
806 icd->y_min = 4;
807 icd->x_current = 1;
808 icd->y_current = 4;
809 icd->width_min = 48;
810 icd->width_max = 752;
811 icd->height_min = 32;
812 icd->height_max = 480;
813 icd->y_skip_top = 1;
814 icd->iface = icl->bus_id;
815 /* Default datawidth - this is the only width this camera (normally)
816 * supports. It is only with extra logic that it can support
817 * other widths. Therefore it seems to be a sensible default. */
818 mt9v022->datawidth = 10;
819
820 ret = bus_switch_request(mt9v022, icl);
821 if (ret)
822 goto eswinit;
823
824 ret = soc_camera_device_register(icd);
825 if (ret)
826 goto eisdr;
827
828 return 0;
829
830 eisdr:
831 bus_switch_release(mt9v022);
832 eswinit:
833 kfree(mt9v022);
834 return ret;
835 }
836
837 static int mt9v022_remove(struct i2c_client *client)
838 {
839 struct mt9v022 *mt9v022 = i2c_get_clientdata(client);
840
841 soc_camera_device_unregister(&mt9v022->icd);
842 bus_switch_release(mt9v022);
843 kfree(mt9v022);
844
845 return 0;
846 }
847 static const struct i2c_device_id mt9v022_id[] = {
848 { "mt9v022", 0 },
849 { }
850 };
851 MODULE_DEVICE_TABLE(i2c, mt9v022_id);
852
853 static struct i2c_driver mt9v022_i2c_driver = {
854 .driver = {
855 .name = "mt9v022",
856 },
857 .probe = mt9v022_probe,
858 .remove = mt9v022_remove,
859 .id_table = mt9v022_id,
860 };
861
862 static int __init mt9v022_mod_init(void)
863 {
864 return i2c_add_driver(&mt9v022_i2c_driver);
865 }
866
867 static void __exit mt9v022_mod_exit(void)
868 {
869 i2c_del_driver(&mt9v022_i2c_driver);
870 }
871
872 module_init(mt9v022_mod_init);
873 module_exit(mt9v022_mod_exit);
874
875 MODULE_DESCRIPTION("Micron MT9V022 Camera driver");
876 MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
877 MODULE_LICENSE("GPL");
(Inofficial) Linux kernel tree running on the Nao robot