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4ad834326fa84a4da900b4412feb05d239263c46
[deliverable/linux.git] / drivers / media / video / mt9m001.c
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
16 #include <media/v4l2-common.h>
17 #include <media/v4l2-chip-ident.h>
18 #include <media/soc_camera.h>
19
20 #ifdef CONFIG_MT9M001_PCA9536_SWITCH
21 #include <asm/gpio.h>
22 #endif
23
24 /* mt9m001 i2c address 0x5d
25 * The platform has to define i2c_board_info
26 * and call i2c_register_board_info() */
27
28 /* mt9m001 selected register addresses */
29 #define MT9M001_CHIP_VERSION 0x00
30 #define MT9M001_ROW_START 0x01
31 #define MT9M001_COLUMN_START 0x02
32 #define MT9M001_WINDOW_HEIGHT 0x03
33 #define MT9M001_WINDOW_WIDTH 0x04
34 #define MT9M001_HORIZONTAL_BLANKING 0x05
35 #define MT9M001_VERTICAL_BLANKING 0x06
36 #define MT9M001_OUTPUT_CONTROL 0x07
37 #define MT9M001_SHUTTER_WIDTH 0x09
38 #define MT9M001_FRAME_RESTART 0x0b
39 #define MT9M001_SHUTTER_DELAY 0x0c
40 #define MT9M001_RESET 0x0d
41 #define MT9M001_READ_OPTIONS1 0x1e
42 #define MT9M001_READ_OPTIONS2 0x20
43 #define MT9M001_GLOBAL_GAIN 0x35
44 #define MT9M001_CHIP_ENABLE 0xF1
45
46 static const struct soc_camera_data_format mt9m001_colour_formats[] = {
47 /* Order important: first natively supported,
48 * second supported with a GPIO extender */
49 {
50 .name = "Bayer (sRGB) 10 bit",
51 .depth = 10,
52 .fourcc = V4L2_PIX_FMT_SBGGR16,
53 .colorspace = V4L2_COLORSPACE_SRGB,
54 }, {
55 .name = "Bayer (sRGB) 8 bit",
56 .depth = 8,
57 .fourcc = V4L2_PIX_FMT_SBGGR8,
58 .colorspace = V4L2_COLORSPACE_SRGB,
59 }
60 };
61
62 static const struct soc_camera_data_format mt9m001_monochrome_formats[] = {
63 /* Order important - see above */
64 {
65 .name = "Monochrome 10 bit",
66 .depth = 10,
67 .fourcc = V4L2_PIX_FMT_Y16,
68 }, {
69 .name = "Monochrome 8 bit",
70 .depth = 8,
71 .fourcc = V4L2_PIX_FMT_GREY,
72 },
73 };
74
75 struct mt9m001 {
76 struct i2c_client *client;
77 struct soc_camera_device icd;
78 int model; /* V4L2_IDENT_MT9M001* codes from v4l2-chip-ident.h */
79 int switch_gpio;
80 unsigned char autoexposure;
81 unsigned char datawidth;
82 };
83
84 static int reg_read(struct soc_camera_device *icd, const u8 reg)
85 {
86 struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
87 struct i2c_client *client = mt9m001->client;
88 s32 data = i2c_smbus_read_word_data(client, reg);
89 return data < 0 ? data : swab16(data);
90 }
91
92 static int reg_write(struct soc_camera_device *icd, const u8 reg,
93 const u16 data)
94 {
95 struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
96 return i2c_smbus_write_word_data(mt9m001->client, reg, swab16(data));
97 }
98
99 static int reg_set(struct soc_camera_device *icd, const u8 reg,
100 const u16 data)
101 {
102 int ret;
103
104 ret = reg_read(icd, reg);
105 if (ret < 0)
106 return ret;
107 return reg_write(icd, reg, ret | data);
108 }
109
110 static int reg_clear(struct soc_camera_device *icd, const u8 reg,
111 const u16 data)
112 {
113 int ret;
114
115 ret = reg_read(icd, reg);
116 if (ret < 0)
117 return ret;
118 return reg_write(icd, reg, ret & ~data);
119 }
120
121 static int mt9m001_init(struct soc_camera_device *icd)
122 {
123 int ret;
124
125 /* Disable chip, synchronous option update */
126 dev_dbg(icd->vdev->dev, "%s\n", __FUNCTION__);
127
128 ret = reg_write(icd, MT9M001_RESET, 1);
129 if (ret >= 0)
130 ret = reg_write(icd, MT9M001_RESET, 0);
131 if (ret >= 0)
132 ret = reg_write(icd, MT9M001_OUTPUT_CONTROL, 0);
133
134 return ret >= 0 ? 0 : -EIO;
135 }
136
137 static int mt9m001_release(struct soc_camera_device *icd)
138 {
139 /* Disable the chip */
140 reg_write(icd, MT9M001_OUTPUT_CONTROL, 0);
141 return 0;
142 }
143
144 static int mt9m001_start_capture(struct soc_camera_device *icd)
145 {
146 /* Switch to master "normal" mode */
147 if (reg_write(icd, MT9M001_OUTPUT_CONTROL, 2) < 0)
148 return -EIO;
149 return 0;
150 }
151
152 static int mt9m001_stop_capture(struct soc_camera_device *icd)
153 {
154 /* Stop sensor readout */
155 if (reg_write(icd, MT9M001_OUTPUT_CONTROL, 0) < 0)
156 return -EIO;
157 return 0;
158 }
159
160 static int bus_switch_request(struct mt9m001 *mt9m001,
161 struct soc_camera_link *icl)
162 {
163 #ifdef CONFIG_MT9M001_PCA9536_SWITCH
164 int ret;
165 unsigned int gpio = icl->gpio;
166
167 if (gpio_is_valid(gpio)) {
168 /* We have a data bus switch. */
169 ret = gpio_request(gpio, "mt9m001");
170 if (ret < 0) {
171 dev_err(&mt9m001->client->dev, "Cannot get GPIO %u\n",
172 gpio);
173 return ret;
174 }
175
176 ret = gpio_direction_output(gpio, 0);
177 if (ret < 0) {
178 dev_err(&mt9m001->client->dev,
179 "Cannot set GPIO %u to output\n", gpio);
180 gpio_free(gpio);
181 return ret;
182 }
183 }
184
185 mt9m001->switch_gpio = gpio;
186 #else
187 mt9m001->switch_gpio = -EINVAL;
188 #endif
189 return 0;
190 }
191
192 static void bus_switch_release(struct mt9m001 *mt9m001)
193 {
194 #ifdef CONFIG_MT9M001_PCA9536_SWITCH
195 if (gpio_is_valid(mt9m001->switch_gpio))
196 gpio_free(mt9m001->switch_gpio);
197 #endif
198 }
199
200 static int bus_switch_act(struct mt9m001 *mt9m001, int go8bit)
201 {
202 #ifdef CONFIG_MT9M001_PCA9536_SWITCH
203 if (!gpio_is_valid(mt9m001->switch_gpio))
204 return -ENODEV;
205
206 gpio_set_value_cansleep(mt9m001->switch_gpio, go8bit);
207 return 0;
208 #else
209 return -ENODEV;
210 #endif
211 }
212
213 static int mt9m001_set_capture_format(struct soc_camera_device *icd,
214 __u32 pixfmt, struct v4l2_rect *rect, unsigned int flags)
215 {
216 struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
217 unsigned int width_flag = flags & (IS_DATAWIDTH_10 | IS_DATAWIDTH_9 |
218 IS_DATAWIDTH_8);
219 int ret;
220 const u16 hblank = 9, vblank = 25;
221
222 /* MT9M001 has all capture_format parameters fixed */
223 if (!(flags & IS_MASTER) ||
224 !(flags & IS_PCLK_SAMPLE_RISING) ||
225 !(flags & IS_HSYNC_ACTIVE_HIGH) ||
226 !(flags & IS_VSYNC_ACTIVE_HIGH))
227 return -EINVAL;
228
229 /* Only one width bit may be set */
230 if (!is_power_of_2(width_flag))
231 return -EINVAL;
232
233 if ((mt9m001->datawidth != 10 && (width_flag == IS_DATAWIDTH_10)) ||
234 (mt9m001->datawidth != 9 && (width_flag == IS_DATAWIDTH_9)) ||
235 (mt9m001->datawidth != 8 && (width_flag == IS_DATAWIDTH_8))) {
236 /* Well, we actually only can do 10 or 8 bits... */
237 if (width_flag == IS_DATAWIDTH_9)
238 return -EINVAL;
239 ret = bus_switch_act(mt9m001,
240 width_flag == IS_DATAWIDTH_8);
241 if (ret < 0)
242 return ret;
243
244 mt9m001->datawidth = width_flag == IS_DATAWIDTH_8 ? 8 : 10;
245 }
246
247 /* Blanking and start values - default... */
248 ret = reg_write(icd, MT9M001_HORIZONTAL_BLANKING, hblank);
249 if (ret >= 0)
250 ret = reg_write(icd, MT9M001_VERTICAL_BLANKING, vblank);
251
252 /* The caller provides a supported format, as verified per
253 * call to icd->try_fmt_cap() */
254 if (ret >= 0)
255 ret = reg_write(icd, MT9M001_COLUMN_START, rect->left);
256 if (ret >= 0)
257 ret = reg_write(icd, MT9M001_ROW_START, rect->top);
258 if (ret >= 0)
259 ret = reg_write(icd, MT9M001_WINDOW_WIDTH, rect->width - 1);
260 if (ret >= 0)
261 ret = reg_write(icd, MT9M001_WINDOW_HEIGHT,
262 rect->height + icd->y_skip_top - 1);
263 if (ret >= 0 && mt9m001->autoexposure) {
264 ret = reg_write(icd, MT9M001_SHUTTER_WIDTH,
265 rect->height + icd->y_skip_top + vblank);
266 if (ret >= 0) {
267 const struct v4l2_queryctrl *qctrl =
268 soc_camera_find_qctrl(icd->ops,
269 V4L2_CID_EXPOSURE);
270 icd->exposure = (524 + (rect->height + icd->y_skip_top +
271 vblank - 1) *
272 (qctrl->maximum - qctrl->minimum)) /
273 1048 + qctrl->minimum;
274 }
275 }
276
277 return ret < 0 ? ret : 0;
278 }
279
280 static int mt9m001_try_fmt_cap(struct soc_camera_device *icd,
281 struct v4l2_format *f)
282 {
283 if (f->fmt.pix.height < 32 + icd->y_skip_top)
284 f->fmt.pix.height = 32 + icd->y_skip_top;
285 if (f->fmt.pix.height > 1024 + icd->y_skip_top)
286 f->fmt.pix.height = 1024 + icd->y_skip_top;
287 if (f->fmt.pix.width < 48)
288 f->fmt.pix.width = 48;
289 if (f->fmt.pix.width > 1280)
290 f->fmt.pix.width = 1280;
291 f->fmt.pix.width &= ~0x01; /* has to be even, unsure why was ~3 */
292
293 return 0;
294 }
295
296 static int mt9m001_get_chip_id(struct soc_camera_device *icd,
297 struct v4l2_chip_ident *id)
298 {
299 struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
300
301 if (id->match_type != V4L2_CHIP_MATCH_I2C_ADDR)
302 return -EINVAL;
303
304 if (id->match_chip != mt9m001->client->addr)
305 return -ENODEV;
306
307 id->ident = mt9m001->model;
308 id->revision = 0;
309
310 return 0;
311 }
312
313 #ifdef CONFIG_VIDEO_ADV_DEBUG
314 static int mt9m001_get_register(struct soc_camera_device *icd,
315 struct v4l2_register *reg)
316 {
317 struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
318
319 if (reg->match_type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
320 return -EINVAL;
321
322 if (reg->match_chip != mt9m001->client->addr)
323 return -ENODEV;
324
325 reg->val = reg_read(icd, reg->reg);
326
327 if (reg->val > 0xffff)
328 return -EIO;
329
330 return 0;
331 }
332
333 static int mt9m001_set_register(struct soc_camera_device *icd,
334 struct v4l2_register *reg)
335 {
336 struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
337
338 if (reg->match_type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
339 return -EINVAL;
340
341 if (reg->match_chip != mt9m001->client->addr)
342 return -ENODEV;
343
344 if (reg_write(icd, reg->reg, reg->val) < 0)
345 return -EIO;
346
347 return 0;
348 }
349 #endif
350
351 static unsigned int mt9m001_get_datawidth(struct soc_camera_device *icd)
352 {
353 struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
354 return mt9m001->datawidth;
355 }
356
357 const struct v4l2_queryctrl mt9m001_controls[] = {
358 {
359 .id = V4L2_CID_VFLIP,
360 .type = V4L2_CTRL_TYPE_BOOLEAN,
361 .name = "Flip Vertically",
362 .minimum = 0,
363 .maximum = 1,
364 .step = 1,
365 .default_value = 0,
366 }, {
367 .id = V4L2_CID_GAIN,
368 .type = V4L2_CTRL_TYPE_INTEGER,
369 .name = "Gain",
370 .minimum = 0,
371 .maximum = 127,
372 .step = 1,
373 .default_value = 64,
374 .flags = V4L2_CTRL_FLAG_SLIDER,
375 }, {
376 .id = V4L2_CID_EXPOSURE,
377 .type = V4L2_CTRL_TYPE_INTEGER,
378 .name = "Exposure",
379 .minimum = 1,
380 .maximum = 255,
381 .step = 1,
382 .default_value = 255,
383 .flags = V4L2_CTRL_FLAG_SLIDER,
384 }, {
385 .id = V4L2_CID_EXPOSURE_AUTO,
386 .type = V4L2_CTRL_TYPE_BOOLEAN,
387 .name = "Automatic Exposure",
388 .minimum = 0,
389 .maximum = 1,
390 .step = 1,
391 .default_value = 1,
392 }
393 };
394
395 static int mt9m001_get_control(struct soc_camera_device *icd, struct v4l2_control *ctrl);
396 static int mt9m001_set_control(struct soc_camera_device *icd, struct v4l2_control *ctrl);
397
398 static struct soc_camera_ops mt9m001_ops = {
399 .owner = THIS_MODULE,
400 .init = mt9m001_init,
401 .release = mt9m001_release,
402 .start_capture = mt9m001_start_capture,
403 .stop_capture = mt9m001_stop_capture,
404 .set_capture_format = mt9m001_set_capture_format,
405 .try_fmt_cap = mt9m001_try_fmt_cap,
406 .formats = NULL, /* Filled in later depending on the */
407 .num_formats = 0, /* camera type and data widths */
408 .get_datawidth = mt9m001_get_datawidth,
409 .controls = mt9m001_controls,
410 .num_controls = ARRAY_SIZE(mt9m001_controls),
411 .get_control = mt9m001_get_control,
412 .set_control = mt9m001_set_control,
413 .get_chip_id = mt9m001_get_chip_id,
414 #ifdef CONFIG_VIDEO_ADV_DEBUG
415 .get_register = mt9m001_get_register,
416 .set_register = mt9m001_set_register,
417 #endif
418 };
419
420 static int mt9m001_get_control(struct soc_camera_device *icd, struct v4l2_control *ctrl)
421 {
422 struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
423 int data;
424
425 switch (ctrl->id) {
426 case V4L2_CID_VFLIP:
427 data = reg_read(icd, MT9M001_READ_OPTIONS2);
428 if (data < 0)
429 return -EIO;
430 ctrl->value = !!(data & 0x8000);
431 break;
432 case V4L2_CID_EXPOSURE_AUTO:
433 ctrl->value = mt9m001->autoexposure;
434 break;
435 }
436 return 0;
437 }
438
439 static int mt9m001_set_control(struct soc_camera_device *icd, struct v4l2_control *ctrl)
440 {
441 struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
442 const struct v4l2_queryctrl *qctrl;
443 int data;
444
445 qctrl = soc_camera_find_qctrl(&mt9m001_ops, ctrl->id);
446
447 if (!qctrl)
448 return -EINVAL;
449
450 switch (ctrl->id) {
451 case V4L2_CID_VFLIP:
452 if (ctrl->value)
453 data = reg_set(icd, MT9M001_READ_OPTIONS2, 0x8000);
454 else
455 data = reg_clear(icd, MT9M001_READ_OPTIONS2, 0x8000);
456 if (data < 0)
457 return -EIO;
458 break;
459 case V4L2_CID_GAIN:
460 if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum)
461 return -EINVAL;
462 /* See Datasheet Table 7, Gain settings. */
463 if (ctrl->value <= qctrl->default_value) {
464 /* Pack it into 0..1 step 0.125, register values 0..8 */
465 unsigned long range = qctrl->default_value - qctrl->minimum;
466 data = ((ctrl->value - qctrl->minimum) * 8 + range / 2) / range;
467
468 dev_dbg(&icd->dev, "Setting gain %d\n", data);
469 data = reg_write(icd, MT9M001_GLOBAL_GAIN, data);
470 if (data < 0)
471 return -EIO;
472 } else {
473 /* Pack it into 1.125..15 variable step, register values 9..67 */
474 /* We assume qctrl->maximum - qctrl->default_value - 1 > 0 */
475 unsigned long range = qctrl->maximum - qctrl->default_value - 1;
476 unsigned long gain = ((ctrl->value - qctrl->default_value - 1) *
477 111 + range / 2) / range + 9;
478
479 if (gain <= 32)
480 data = gain;
481 else if (gain <= 64)
482 data = ((gain - 32) * 16 + 16) / 32 + 80;
483 else
484 data = ((gain - 64) * 7 + 28) / 56 + 96;
485
486 dev_dbg(&icd->dev, "Setting gain from %d to %d\n",
487 reg_read(icd, MT9M001_GLOBAL_GAIN), data);
488 data = reg_write(icd, MT9M001_GLOBAL_GAIN, data);
489 if (data < 0)
490 return -EIO;
491 }
492
493 /* Success */
494 icd->gain = ctrl->value;
495 break;
496 case V4L2_CID_EXPOSURE:
497 /* mt9m001 has maximum == default */
498 if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum)
499 return -EINVAL;
500 else {
501 unsigned long range = qctrl->maximum - qctrl->minimum;
502 unsigned long shutter = ((ctrl->value - qctrl->minimum) * 1048 +
503 range / 2) / range + 1;
504
505 dev_dbg(&icd->dev, "Setting shutter width from %d to %lu\n",
506 reg_read(icd, MT9M001_SHUTTER_WIDTH), shutter);
507 if (reg_write(icd, MT9M001_SHUTTER_WIDTH, shutter) < 0)
508 return -EIO;
509 icd->exposure = ctrl->value;
510 mt9m001->autoexposure = 0;
511 }
512 break;
513 case V4L2_CID_EXPOSURE_AUTO:
514 if (ctrl->value) {
515 const u16 vblank = 25;
516 if (reg_write(icd, MT9M001_SHUTTER_WIDTH, icd->height +
517 icd->y_skip_top + vblank) < 0)
518 return -EIO;
519 qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_EXPOSURE);
520 icd->exposure = (524 + (icd->height + icd->y_skip_top + vblank - 1) *
521 (qctrl->maximum - qctrl->minimum)) /
522 1048 + qctrl->minimum;
523 mt9m001->autoexposure = 1;
524 } else
525 mt9m001->autoexposure = 0;
526 break;
527 }
528 return 0;
529 }
530
531 /* Interface active, can use i2c. If it fails, it can indeed mean, that
532 * this wasn't our capture interface, so, we wait for the right one */
533 static int mt9m001_video_probe(struct soc_camera_device *icd)
534 {
535 struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
536 s32 data;
537 int ret;
538
539 /* We must have a parent by now. And it cannot be a wrong one.
540 * So this entire test is completely redundant. */
541 if (!icd->dev.parent ||
542 to_soc_camera_host(icd->dev.parent)->nr != icd->iface)
543 return -ENODEV;
544
545 /* Enable the chip */
546 data = reg_write(&mt9m001->icd, MT9M001_CHIP_ENABLE, 1);
547 dev_dbg(&icd->dev, "write: %d\n", data);
548
549 /* Read out the chip version register */
550 data = reg_read(icd, MT9M001_CHIP_VERSION);
551
552 /* must be 0x8411 or 0x8421 for colour sensor and 8431 for bw */
553 switch (data) {
554 case 0x8411:
555 case 0x8421:
556 mt9m001->model = V4L2_IDENT_MT9M001C12ST;
557 mt9m001_ops.formats = mt9m001_colour_formats;
558 if (mt9m001->client->dev.platform_data)
559 mt9m001_ops.num_formats = ARRAY_SIZE(mt9m001_colour_formats);
560 else
561 mt9m001_ops.num_formats = 1;
562 break;
563 case 0x8431:
564 mt9m001->model = V4L2_IDENT_MT9M001C12STM;
565 mt9m001_ops.formats = mt9m001_monochrome_formats;
566 if (mt9m001->client->dev.platform_data)
567 mt9m001_ops.num_formats = ARRAY_SIZE(mt9m001_monochrome_formats);
568 else
569 mt9m001_ops.num_formats = 1;
570 break;
571 default:
572 ret = -ENODEV;
573 dev_err(&icd->dev,
574 "No MT9M001 chip detected, register read %x\n", data);
575 goto ei2c;
576 }
577
578 dev_info(&icd->dev, "Detected a MT9M001 chip ID %x (%s)\n", data,
579 data == 0x8431 ? "C12STM" : "C12ST");
580
581 /* Now that we know the model, we can start video */
582 ret = soc_camera_video_start(icd);
583 if (ret)
584 goto eisis;
585
586 return 0;
587
588 eisis:
589 ei2c:
590 return ret;
591 }
592
593 static void mt9m001_video_remove(struct soc_camera_device *icd)
594 {
595 struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
596
597 dev_dbg(&icd->dev, "Video %x removed: %p, %p\n", mt9m001->client->addr,
598 mt9m001->icd.dev.parent, mt9m001->icd.vdev);
599 soc_camera_video_stop(&mt9m001->icd);
600 }
601
602 static int mt9m001_probe(struct i2c_client *client)
603 {
604 struct mt9m001 *mt9m001;
605 struct soc_camera_device *icd;
606 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
607 struct soc_camera_link *icl = client->dev.platform_data;
608 int ret;
609
610 if (!icl) {
611 dev_err(&client->dev, "MT9M001 driver needs platform data\n");
612 return -EINVAL;
613 }
614
615 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
616 dev_warn(&adapter->dev,
617 "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
618 return -EIO;
619 }
620
621 mt9m001 = kzalloc(sizeof(struct mt9m001), GFP_KERNEL);
622 if (!mt9m001)
623 return -ENOMEM;
624
625 mt9m001->client = client;
626 i2c_set_clientdata(client, mt9m001);
627
628 /* Second stage probe - when a capture adapter is there */
629 icd = &mt9m001->icd;
630 icd->probe = mt9m001_video_probe;
631 icd->remove = mt9m001_video_remove;
632 icd->ops = &mt9m001_ops;
633 icd->control = &client->dev;
634 icd->x_min = 20;
635 icd->y_min = 12;
636 icd->x_current = 20;
637 icd->y_current = 12;
638 icd->width_min = 48;
639 icd->width_max = 1280;
640 icd->height_min = 32;
641 icd->height_max = 1024;
642 icd->y_skip_top = 1;
643 icd->iface = icl->bus_id;
644 /* Default datawidth - this is the only width this camera (normally)
645 * supports. It is only with extra logic that it can support
646 * other widths. Therefore it seems to be a sensible default. */
647 mt9m001->datawidth = 10;
648 /* Simulated autoexposure. If enabled, we calculate shutter width
649 * ourselves in the driver based on vertical blanking and frame width */
650 mt9m001->autoexposure = 1;
651
652 ret = bus_switch_request(mt9m001, icl);
653 if (ret)
654 goto eswinit;
655
656 ret = soc_camera_device_register(icd);
657 if (ret)
658 goto eisdr;
659
660 return 0;
661
662 eisdr:
663 bus_switch_release(mt9m001);
664 eswinit:
665 kfree(mt9m001);
666 return ret;
667 }
668
669 static int mt9m001_remove(struct i2c_client *client)
670 {
671 struct mt9m001 *mt9m001 = i2c_get_clientdata(client);
672
673 soc_camera_device_unregister(&mt9m001->icd);
674 bus_switch_release(mt9m001);
675 kfree(mt9m001);
676
677 return 0;
678 }
679
680 static struct i2c_driver mt9m001_i2c_driver = {
681 .driver = {
682 .name = "mt9m001",
683 },
684 .probe = mt9m001_probe,
685 .remove = mt9m001_remove,
686 };
687
688 static int __init mt9m001_mod_init(void)
689 {
690 return i2c_add_driver(&mt9m001_i2c_driver);
691 }
692
693 static void __exit mt9m001_mod_exit(void)
694 {
695 i2c_del_driver(&mt9m001_i2c_driver);
696 }
697
698 module_init(mt9m001_mod_init);
699 module_exit(mt9m001_mod_exit);
700
701 MODULE_DESCRIPTION("Micron MT9M001 Camera driver");
702 MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
703 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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