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added 2.6.29.6 aldebaran kernel
[nao-ulib.git] / kernel / 2.6.29.6-aldebaran-rt / drivers / media / video / mt9m001.c
blobc1bf75ef2741389576f167c65ccbda8254fa4c40
1 /*
2 * Driver for MT9M001 CMOS Image Sensor from Micron
3 *
4 * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11 #include <linux/videodev2.h>
12 #include <linux/slab.h>
13 #include <linux/i2c.h>
14 #include <linux/log2.h>
15 #include <linux/gpio.h>
16
17 #include <media/v4l2-common.h>
18 #include <media/v4l2-chip-ident.h>
19 #include <media/soc_camera.h>
20
21 /* mt9m001 i2c address 0x5d
22 * The platform has to define i2c_board_info
23 * and call i2c_register_board_info() */
24
25 /* mt9m001 selected register addresses */
26 #define MT9M001_CHIP_VERSION 0x00
27 #define MT9M001_ROW_START 0x01
28 #define MT9M001_COLUMN_START 0x02
29 #define MT9M001_WINDOW_HEIGHT 0x03
30 #define MT9M001_WINDOW_WIDTH 0x04
31 #define MT9M001_HORIZONTAL_BLANKING 0x05
32 #define MT9M001_VERTICAL_BLANKING 0x06
33 #define MT9M001_OUTPUT_CONTROL 0x07
34 #define MT9M001_SHUTTER_WIDTH 0x09
35 #define MT9M001_FRAME_RESTART 0x0b
36 #define MT9M001_SHUTTER_DELAY 0x0c
37 #define MT9M001_RESET 0x0d
38 #define MT9M001_READ_OPTIONS1 0x1e
39 #define MT9M001_READ_OPTIONS2 0x20
40 #define MT9M001_GLOBAL_GAIN 0x35
41 #define MT9M001_CHIP_ENABLE 0xF1
42
43 static const struct soc_camera_data_format mt9m001_colour_formats[] = {
44 /* Order important: first natively supported,
45 * second supported with a GPIO extender */
46 {
47 .name = "Bayer (sRGB) 10 bit",
48 .depth = 10,
49 .fourcc = V4L2_PIX_FMT_SBGGR16,
50 .colorspace = V4L2_COLORSPACE_SRGB,
51 }, {
52 .name = "Bayer (sRGB) 8 bit",
53 .depth = 8,
54 .fourcc = V4L2_PIX_FMT_SBGGR8,
55 .colorspace = V4L2_COLORSPACE_SRGB,
56 }
57 };
58
59 static const struct soc_camera_data_format mt9m001_monochrome_formats[] = {
60 /* Order important - see above */
61 {
62 .name = "Monochrome 10 bit",
63 .depth = 10,
64 .fourcc = V4L2_PIX_FMT_Y16,
65 }, {
66 .name = "Monochrome 8 bit",
67 .depth = 8,
68 .fourcc = V4L2_PIX_FMT_GREY,
69 },
70 };
71
72 struct mt9m001 {
73 struct i2c_client *client;
74 struct soc_camera_device icd;
75 int model; /* V4L2_IDENT_MT9M001* codes from v4l2-chip-ident.h */
76 int switch_gpio;
77 unsigned char autoexposure;
78 unsigned char datawidth;
79 };
80
81 static int reg_read(struct soc_camera_device *icd, const u8 reg)
82 {
83 struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
84 struct i2c_client *client = mt9m001->client;
85 s32 data = i2c_smbus_read_word_data(client, reg);
86 return data < 0 ? data : swab16(data);
87 }
88
89 static int reg_write(struct soc_camera_device *icd, const u8 reg,
90 const u16 data)
91 {
92 struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
93 return i2c_smbus_write_word_data(mt9m001->client, reg, swab16(data));
94 }
95
96 static int reg_set(struct soc_camera_device *icd, const u8 reg,
97 const u16 data)
98 {
99 int ret;
100
101 ret = reg_read(icd, reg);
102 if (ret < 0)
103 return ret;
104 return reg_write(icd, reg, ret | data);
105 }
106
107 static int reg_clear(struct soc_camera_device *icd, const u8 reg,
108 const u16 data)
109 {
110 int ret;
111
112 ret = reg_read(icd, reg);
113 if (ret < 0)
114 return ret;
115 return reg_write(icd, reg, ret & ~data);
116 }
117
118 static int mt9m001_init(struct soc_camera_device *icd)
119 {
120 struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
121 struct soc_camera_link *icl = mt9m001->client->dev.platform_data;
122 int ret;
123
124 dev_dbg(icd->vdev->parent, "%s\n", __func__);
125
126 if (icl->power) {
127 ret = icl->power(&mt9m001->client->dev, 1);
128 if (ret < 0) {
129 dev_err(icd->vdev->parent,
130 "Platform failed to power-on the camera.\n");
131 return ret;
132 }
133 }
134
135 /* The camera could have been already on, we reset it additionally */
136 if (icl->reset)
137 ret = icl->reset(&mt9m001->client->dev);
138 else
139 ret = -ENODEV;
140
141 if (ret < 0) {
142 /* Either no platform reset, or platform reset failed */
143 ret = reg_write(icd, MT9M001_RESET, 1);
144 if (!ret)
145 ret = reg_write(icd, MT9M001_RESET, 0);
146 }
147 /* Disable chip, synchronous option update */
148 if (!ret)
149 ret = reg_write(icd, MT9M001_OUTPUT_CONTROL, 0);
150
151 return ret;
152 }
153
154 static int mt9m001_release(struct soc_camera_device *icd)
155 {
156 struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
157 struct soc_camera_link *icl = mt9m001->client->dev.platform_data;
158
159 /* Disable the chip */
160 reg_write(icd, MT9M001_OUTPUT_CONTROL, 0);
161
162 if (icl->power)
163 icl->power(&mt9m001->client->dev, 0);
164
165 return 0;
166 }
167
168 static int mt9m001_start_capture(struct soc_camera_device *icd)
169 {
170 /* Switch to master "normal" mode */
171 if (reg_write(icd, MT9M001_OUTPUT_CONTROL, 2) < 0)
172 return -EIO;
173 return 0;
174 }
175
176 static int mt9m001_stop_capture(struct soc_camera_device *icd)
177 {
178 /* Stop sensor readout */
179 if (reg_write(icd, MT9M001_OUTPUT_CONTROL, 0) < 0)
180 return -EIO;
181 return 0;
182 }
183
184 static int bus_switch_request(struct mt9m001 *mt9m001,
185 struct soc_camera_link *icl)
186 {
187 #ifdef CONFIG_MT9M001_PCA9536_SWITCH
188 int ret;
189 unsigned int gpio = icl->gpio;
190
191 if (gpio_is_valid(gpio)) {
192 /* We have a data bus switch. */
193 ret = gpio_request(gpio, "mt9m001");
194 if (ret < 0) {
195 dev_err(&mt9m001->client->dev, "Cannot get GPIO %u\n",
196 gpio);
197 return ret;
198 }
199
200 ret = gpio_direction_output(gpio, 0);
201 if (ret < 0) {
202 dev_err(&mt9m001->client->dev,
203 "Cannot set GPIO %u to output\n", gpio);
204 gpio_free(gpio);
205 return ret;
206 }
207 }
208
209 mt9m001->switch_gpio = gpio;
210 #else
211 mt9m001->switch_gpio = -EINVAL;
212 #endif
213 return 0;
214 }
215
216 static void bus_switch_release(struct mt9m001 *mt9m001)
217 {
218 #ifdef CONFIG_MT9M001_PCA9536_SWITCH
219 if (gpio_is_valid(mt9m001->switch_gpio))
220 gpio_free(mt9m001->switch_gpio);
221 #endif
222 }
223
224 static int bus_switch_act(struct mt9m001 *mt9m001, int go8bit)
225 {
226 #ifdef CONFIG_MT9M001_PCA9536_SWITCH
227 if (!gpio_is_valid(mt9m001->switch_gpio))
228 return -ENODEV;
229
230 gpio_set_value_cansleep(mt9m001->switch_gpio, go8bit);
231 return 0;
232 #else
233 return -ENODEV;
234 #endif
235 }
236
237 static int bus_switch_possible(struct mt9m001 *mt9m001)
238 {
239 #ifdef CONFIG_MT9M001_PCA9536_SWITCH
240 return gpio_is_valid(mt9m001->switch_gpio);
241 #else
242 return 0;
243 #endif
244 }
245
246 static int mt9m001_set_bus_param(struct soc_camera_device *icd,
247 unsigned long flags)
248 {
249 struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
250 unsigned int width_flag = flags & SOCAM_DATAWIDTH_MASK;
251 int ret;
252
253 /* Flags validity verified in test_bus_param */
254
255 if ((mt9m001->datawidth != 10 && (width_flag == SOCAM_DATAWIDTH_10)) ||
256 (mt9m001->datawidth != 9 && (width_flag == SOCAM_DATAWIDTH_9)) ||
257 (mt9m001->datawidth != 8 && (width_flag == SOCAM_DATAWIDTH_8))) {
258 /* Well, we actually only can do 10 or 8 bits... */
259 if (width_flag == SOCAM_DATAWIDTH_9)
260 return -EINVAL;
261 ret = bus_switch_act(mt9m001,
262 width_flag == SOCAM_DATAWIDTH_8);
263 if (ret < 0)
264 return ret;
265
266 mt9m001->datawidth = width_flag == SOCAM_DATAWIDTH_8 ? 8 : 10;
267 }
268
269 return 0;
270 }
271
272 static unsigned long mt9m001_query_bus_param(struct soc_camera_device *icd)
273 {
274 struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
275 struct soc_camera_link *icl = mt9m001->client->dev.platform_data;
276 /* MT9M001 has all capture_format parameters fixed */
277 unsigned long flags = SOCAM_DATAWIDTH_10 | SOCAM_PCLK_SAMPLE_RISING |
278 SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_HIGH |
279 SOCAM_MASTER;
280
281 if (bus_switch_possible(mt9m001))
282 flags |= SOCAM_DATAWIDTH_8;
283
284 return soc_camera_apply_sensor_flags(icl, flags);
285 }
286
287 static int mt9m001_set_fmt(struct soc_camera_device *icd,
288 __u32 pixfmt, struct v4l2_rect *rect)
289 {
290 struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
291 int ret;
292 const u16 hblank = 9, vblank = 25;
293
294 /* Blanking and start values - default... */
295 ret = reg_write(icd, MT9M001_HORIZONTAL_BLANKING, hblank);
296 if (!ret)
297 ret = reg_write(icd, MT9M001_VERTICAL_BLANKING, vblank);
298
299 /* The caller provides a supported format, as verified per
300 * call to icd->try_fmt() */
301 if (!ret)
302 ret = reg_write(icd, MT9M001_COLUMN_START, rect->left);
303 if (!ret)
304 ret = reg_write(icd, MT9M001_ROW_START, rect->top);
305 if (!ret)
306 ret = reg_write(icd, MT9M001_WINDOW_WIDTH, rect->width - 1);
307 if (!ret)
308 ret = reg_write(icd, MT9M001_WINDOW_HEIGHT,
309 rect->height + icd->y_skip_top - 1);
310 if (!ret && mt9m001->autoexposure) {
311 ret = reg_write(icd, MT9M001_SHUTTER_WIDTH,
312 rect->height + icd->y_skip_top + vblank);
313 if (!ret) {
314 const struct v4l2_queryctrl *qctrl =
315 soc_camera_find_qctrl(icd->ops,
316 V4L2_CID_EXPOSURE);
317 icd->exposure = (524 + (rect->height + icd->y_skip_top +
318 vblank - 1) *
319 (qctrl->maximum - qctrl->minimum)) /
320 1048 + qctrl->minimum;
321 }
322 }
323
324 return ret;
325 }
326
327 static int mt9m001_try_fmt(struct soc_camera_device *icd,
328 struct v4l2_format *f)
329 {
330 struct v4l2_pix_format *pix = &f->fmt.pix;
331
332 if (pix->height < 32 + icd->y_skip_top)
333 pix->height = 32 + icd->y_skip_top;
334 if (pix->height > 1024 + icd->y_skip_top)
335 pix->height = 1024 + icd->y_skip_top;
336 if (pix->width < 48)
337 pix->width = 48;
338 if (pix->width > 1280)
339 pix->width = 1280;
340 pix->width &= ~0x01; /* has to be even, unsure why was ~3 */
341
342 return 0;
343 }
344
345 static int mt9m001_get_chip_id(struct soc_camera_device *icd,
346 struct v4l2_dbg_chip_ident *id)
347 {
348 struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
349
350 if (id->match.type != V4L2_CHIP_MATCH_I2C_ADDR)
351 return -EINVAL;
352
353 if (id->match.addr != mt9m001->client->addr)
354 return -ENODEV;
355
356 id->ident = mt9m001->model;
357 id->revision = 0;
358
359 return 0;
360 }
361
362 #ifdef CONFIG_VIDEO_ADV_DEBUG
363 static int mt9m001_get_register(struct soc_camera_device *icd,
364 struct v4l2_dbg_register *reg)
365 {
366 struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
367
368 if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
369 return -EINVAL;
370
371 if (reg->match.addr != mt9m001->client->addr)
372 return -ENODEV;
373
374 reg->size = 2;
375 reg->val = reg_read(icd, reg->reg);
376
377 if (reg->val > 0xffff)
378 return -EIO;
379
380 return 0;
381 }
382
383 static int mt9m001_set_register(struct soc_camera_device *icd,
384 struct v4l2_dbg_register *reg)
385 {
386 struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
387
388 if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
389 return -EINVAL;
390
391 if (reg->match.addr != mt9m001->client->addr)
392 return -ENODEV;
393
394 if (reg_write(icd, reg->reg, reg->val) < 0)
395 return -EIO;
396
397 return 0;
398 }
399 #endif
400
401 static const struct v4l2_queryctrl mt9m001_controls[] = {
402 {
403 .id = V4L2_CID_VFLIP,
404 .type = V4L2_CTRL_TYPE_BOOLEAN,
405 .name = "Flip Vertically",
406 .minimum = 0,
407 .maximum = 1,
408 .step = 1,
409 .default_value = 0,
410 }, {
411 .id = V4L2_CID_GAIN,
412 .type = V4L2_CTRL_TYPE_INTEGER,
413 .name = "Gain",
414 .minimum = 0,
415 .maximum = 127,
416 .step = 1,
417 .default_value = 64,
418 .flags = V4L2_CTRL_FLAG_SLIDER,
419 }, {
420 .id = V4L2_CID_EXPOSURE,
421 .type = V4L2_CTRL_TYPE_INTEGER,
422 .name = "Exposure",
423 .minimum = 1,
424 .maximum = 255,
425 .step = 1,
426 .default_value = 255,
427 .flags = V4L2_CTRL_FLAG_SLIDER,
428 }, {
429 .id = V4L2_CID_EXPOSURE_AUTO,
430 .type = V4L2_CTRL_TYPE_BOOLEAN,
431 .name = "Automatic Exposure",
432 .minimum = 0,
433 .maximum = 1,
434 .step = 1,
435 .default_value = 1,
436 }
437 };
438
439 static int mt9m001_video_probe(struct soc_camera_device *);
440 static void mt9m001_video_remove(struct soc_camera_device *);
441 static int mt9m001_get_control(struct soc_camera_device *, struct v4l2_control *);
442 static int mt9m001_set_control(struct soc_camera_device *, struct v4l2_control *);
443
444 static struct soc_camera_ops mt9m001_ops = {
445 .owner = THIS_MODULE,
446 .probe = mt9m001_video_probe,
447 .remove = mt9m001_video_remove,
448 .init = mt9m001_init,
449 .release = mt9m001_release,
450 .start_capture = mt9m001_start_capture,
451 .stop_capture = mt9m001_stop_capture,
452 .set_fmt = mt9m001_set_fmt,
453 .try_fmt = mt9m001_try_fmt,
454 .set_bus_param = mt9m001_set_bus_param,
455 .query_bus_param = mt9m001_query_bus_param,
456 .controls = mt9m001_controls,
457 .num_controls = ARRAY_SIZE(mt9m001_controls),
458 .get_control = mt9m001_get_control,
459 .set_control = mt9m001_set_control,
460 .get_chip_id = mt9m001_get_chip_id,
461 #ifdef CONFIG_VIDEO_ADV_DEBUG
462 .get_register = mt9m001_get_register,
463 .set_register = mt9m001_set_register,
464 #endif
465 };
466
467 static int mt9m001_get_control(struct soc_camera_device *icd, struct v4l2_control *ctrl)
468 {
469 struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
470 int data;
471
472 switch (ctrl->id) {
473 case V4L2_CID_VFLIP:
474 data = reg_read(icd, MT9M001_READ_OPTIONS2);
475 if (data < 0)
476 return -EIO;
477 ctrl->value = !!(data & 0x8000);
478 break;
479 case V4L2_CID_EXPOSURE_AUTO:
480 ctrl->value = mt9m001->autoexposure;
481 break;
482 }
483 return 0;
484 }
485
486 static int mt9m001_set_control(struct soc_camera_device *icd, struct v4l2_control *ctrl)
487 {
488 struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
489 const struct v4l2_queryctrl *qctrl;
490 int data;
491
492 qctrl = soc_camera_find_qctrl(&mt9m001_ops, ctrl->id);
493
494 if (!qctrl)
495 return -EINVAL;
496
497 switch (ctrl->id) {
498 case V4L2_CID_VFLIP:
499 if (ctrl->value)
500 data = reg_set(icd, MT9M001_READ_OPTIONS2, 0x8000);
501 else
502 data = reg_clear(icd, MT9M001_READ_OPTIONS2, 0x8000);
503 if (data < 0)
504 return -EIO;
505 break;
506 case V4L2_CID_GAIN:
507 if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum)
508 return -EINVAL;
509 /* See Datasheet Table 7, Gain settings. */
510 if (ctrl->value <= qctrl->default_value) {
511 /* Pack it into 0..1 step 0.125, register values 0..8 */
512 unsigned long range = qctrl->default_value - qctrl->minimum;
513 data = ((ctrl->value - qctrl->minimum) * 8 + range / 2) / range;
514
515 dev_dbg(&icd->dev, "Setting gain %d\n", data);
516 data = reg_write(icd, MT9M001_GLOBAL_GAIN, data);
517 if (data < 0)
518 return -EIO;
519 } else {
520 /* Pack it into 1.125..15 variable step, register values 9..67 */
521 /* We assume qctrl->maximum - qctrl->default_value - 1 > 0 */
522 unsigned long range = qctrl->maximum - qctrl->default_value - 1;
523 unsigned long gain = ((ctrl->value - qctrl->default_value - 1) *
524 111 + range / 2) / range + 9;
525
526 if (gain <= 32)
527 data = gain;
528 else if (gain <= 64)
529 data = ((gain - 32) * 16 + 16) / 32 + 80;
530 else
531 data = ((gain - 64) * 7 + 28) / 56 + 96;
532
533 dev_dbg(&icd->dev, "Setting gain from %d to %d\n",
534 reg_read(icd, MT9M001_GLOBAL_GAIN), data);
535 data = reg_write(icd, MT9M001_GLOBAL_GAIN, data);
536 if (data < 0)
537 return -EIO;
538 }
539
540 /* Success */
541 icd->gain = ctrl->value;
542 break;
543 case V4L2_CID_EXPOSURE:
544 /* mt9m001 has maximum == default */
545 if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum)
546 return -EINVAL;
547 else {
548 unsigned long range = qctrl->maximum - qctrl->minimum;
549 unsigned long shutter = ((ctrl->value - qctrl->minimum) * 1048 +
550 range / 2) / range + 1;
551
552 dev_dbg(&icd->dev, "Setting shutter width from %d to %lu\n",
553 reg_read(icd, MT9M001_SHUTTER_WIDTH), shutter);
554 if (reg_write(icd, MT9M001_SHUTTER_WIDTH, shutter) < 0)
555 return -EIO;
556 icd->exposure = ctrl->value;
557 mt9m001->autoexposure = 0;
558 }
559 break;
560 case V4L2_CID_EXPOSURE_AUTO:
561 if (ctrl->value) {
562 const u16 vblank = 25;
563 if (reg_write(icd, MT9M001_SHUTTER_WIDTH, icd->height +
564 icd->y_skip_top + vblank) < 0)
565 return -EIO;
566 qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_EXPOSURE);
567 icd->exposure = (524 + (icd->height + icd->y_skip_top + vblank - 1) *
568 (qctrl->maximum - qctrl->minimum)) /
569 1048 + qctrl->minimum;
570 mt9m001->autoexposure = 1;
571 } else
572 mt9m001->autoexposure = 0;
573 break;
574 }
575 return 0;
576 }
577
578 /* Interface active, can use i2c. If it fails, it can indeed mean, that
579 * this wasn't our capture interface, so, we wait for the right one */
580 static int mt9m001_video_probe(struct soc_camera_device *icd)
581 {
582 struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
583 struct soc_camera_link *icl = mt9m001->client->dev.platform_data;
584 s32 data;
585 int ret;
586
587 /* We must have a parent by now. And it cannot be a wrong one.
588 * So this entire test is completely redundant. */
589 if (!icd->dev.parent ||
590 to_soc_camera_host(icd->dev.parent)->nr != icd->iface)
591 return -ENODEV;
592
593 /* Enable the chip */
594 data = reg_write(icd, MT9M001_CHIP_ENABLE, 1);
595 dev_dbg(&icd->dev, "write: %d\n", data);
596
597 /* Read out the chip version register */
598 data = reg_read(icd, MT9M001_CHIP_VERSION);
599
600 /* must be 0x8411 or 0x8421 for colour sensor and 8431 for bw */
601 switch (data) {
602 case 0x8411:
603 case 0x8421:
604 mt9m001->model = V4L2_IDENT_MT9M001C12ST;
605 icd->formats = mt9m001_colour_formats;
606 if (gpio_is_valid(icl->gpio))
607 icd->num_formats = ARRAY_SIZE(mt9m001_colour_formats);
608 else
609 icd->num_formats = 1;
610 break;
611 case 0x8431:
612 mt9m001->model = V4L2_IDENT_MT9M001C12STM;
613 icd->formats = mt9m001_monochrome_formats;
614 if (gpio_is_valid(icl->gpio))
615 icd->num_formats = ARRAY_SIZE(mt9m001_monochrome_formats);
616 else
617 icd->num_formats = 1;
618 break;
619 default:
620 ret = -ENODEV;
621 dev_err(&icd->dev,
622 "No MT9M001 chip detected, register read %x\n", data);
623 goto ei2c;
624 }
625
626 dev_info(&icd->dev, "Detected a MT9M001 chip ID %x (%s)\n", data,
627 data == 0x8431 ? "C12STM" : "C12ST");
628
629 /* Now that we know the model, we can start video */
630 ret = soc_camera_video_start(icd);
631 if (ret)
632 goto eisis;
633
634 return 0;
635
636 eisis:
637 ei2c:
638 return ret;
639 }
640
641 static void mt9m001_video_remove(struct soc_camera_device *icd)
642 {
643 struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
644
645 dev_dbg(&icd->dev, "Video %x removed: %p, %p\n", mt9m001->client->addr,
646 icd->dev.parent, icd->vdev);
647 soc_camera_video_stop(icd);
648 }
649
650 static int mt9m001_probe(struct i2c_client *client,
651 const struct i2c_device_id *did)
652 {
653 struct mt9m001 *mt9m001;
654 struct soc_camera_device *icd;
655 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
656 struct soc_camera_link *icl = client->dev.platform_data;
657 int ret;
658
659 if (!icl) {
660 dev_err(&client->dev, "MT9M001 driver needs platform data\n");
661 return -EINVAL;
662 }
663
664 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
665 dev_warn(&adapter->dev,
666 "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
667 return -EIO;
668 }
669
670 mt9m001 = kzalloc(sizeof(struct mt9m001), GFP_KERNEL);
671 if (!mt9m001)
672 return -ENOMEM;
673
674 mt9m001->client = client;
675 i2c_set_clientdata(client, mt9m001);
676
677 /* Second stage probe - when a capture adapter is there */
678 icd = &mt9m001->icd;
679 icd->ops = &mt9m001_ops;
680 icd->control = &client->dev;
681 icd->x_min = 20;
682 icd->y_min = 12;
683 icd->x_current = 20;
684 icd->y_current = 12;
685 icd->width_min = 48;
686 icd->width_max = 1280;
687 icd->height_min = 32;
688 icd->height_max = 1024;
689 icd->y_skip_top = 1;
690 icd->iface = icl->bus_id;
691 /* Default datawidth - this is the only width this camera (normally)
692 * supports. It is only with extra logic that it can support
693 * other widths. Therefore it seems to be a sensible default. */
694 mt9m001->datawidth = 10;
695 /* Simulated autoexposure. If enabled, we calculate shutter width
696 * ourselves in the driver based on vertical blanking and frame width */
697 mt9m001->autoexposure = 1;
698
699 ret = bus_switch_request(mt9m001, icl);
700 if (ret)
701 goto eswinit;
702
703 ret = soc_camera_device_register(icd);
704 if (ret)
705 goto eisdr;
706
707 return 0;
708
709 eisdr:
710 bus_switch_release(mt9m001);
711 eswinit:
712 kfree(mt9m001);
713 return ret;
714 }
715
716 static int mt9m001_remove(struct i2c_client *client)
717 {
718 struct mt9m001 *mt9m001 = i2c_get_clientdata(client);
719
720 soc_camera_device_unregister(&mt9m001->icd);
721 bus_switch_release(mt9m001);
722 kfree(mt9m001);
723
724 return 0;
725 }
726
727 static const struct i2c_device_id mt9m001_id[] = {
728 { "mt9m001", 0 },
729 { }
730 };
731 MODULE_DEVICE_TABLE(i2c, mt9m001_id);
732
733 static struct i2c_driver mt9m001_i2c_driver = {
734 .driver = {
735 .name = "mt9m001",
736 },
737 .probe = mt9m001_probe,
738 .remove = mt9m001_remove,
739 .id_table = mt9m001_id,
740 };
741
742 static int __init mt9m001_mod_init(void)
743 {
744 return i2c_add_driver(&mt9m001_i2c_driver);
745 }
746
747 static void __exit mt9m001_mod_exit(void)
748 {
749 i2c_del_driver(&mt9m001_i2c_driver);
750 }
751
752 module_init(mt9m001_mod_init);
753 module_exit(mt9m001_mod_exit);
754
755 MODULE_DESCRIPTION("Micron MT9M001 Camera driver");
756 MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
757 MODULE_LICENSE("GPL");
Nao low-level kernelspace/userspace library that runs on our robots, Nao-Team HTWK