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4e96fd08 GL |
1 | /* |
2 | * Driver for MT9T031 CMOS Image Sensor from Micron | |
3 | * | |
4 | * Copyright (C) 2008, Guennadi Liakhovetski, DENX Software Engineering <lg@denx.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 | /* mt9t031 i2c address 0x5d | |
21 | * The platform has to define i2c_board_info | |
22 | * and call i2c_register_board_info() */ | |
23 | ||
24 | /* mt9t031 selected register addresses */ | |
25 | #define MT9T031_CHIP_VERSION 0x00 | |
26 | #define MT9T031_ROW_START 0x01 | |
27 | #define MT9T031_COLUMN_START 0x02 | |
28 | #define MT9T031_WINDOW_HEIGHT 0x03 | |
29 | #define MT9T031_WINDOW_WIDTH 0x04 | |
30 | #define MT9T031_HORIZONTAL_BLANKING 0x05 | |
31 | #define MT9T031_VERTICAL_BLANKING 0x06 | |
32 | #define MT9T031_OUTPUT_CONTROL 0x07 | |
33 | #define MT9T031_SHUTTER_WIDTH_UPPER 0x08 | |
34 | #define MT9T031_SHUTTER_WIDTH 0x09 | |
35 | #define MT9T031_PIXEL_CLOCK_CONTROL 0x0a | |
36 | #define MT9T031_FRAME_RESTART 0x0b | |
37 | #define MT9T031_SHUTTER_DELAY 0x0c | |
38 | #define MT9T031_RESET 0x0d | |
39 | #define MT9T031_READ_MODE_1 0x1e | |
40 | #define MT9T031_READ_MODE_2 0x20 | |
41 | #define MT9T031_READ_MODE_3 0x21 | |
42 | #define MT9T031_ROW_ADDRESS_MODE 0x22 | |
43 | #define MT9T031_COLUMN_ADDRESS_MODE 0x23 | |
44 | #define MT9T031_GLOBAL_GAIN 0x35 | |
45 | #define MT9T031_CHIP_ENABLE 0xF8 | |
46 | ||
47 | #define MT9T031_MAX_HEIGHT 1536 | |
48 | #define MT9T031_MAX_WIDTH 2048 | |
49 | #define MT9T031_MIN_HEIGHT 2 | |
50 | #define MT9T031_MIN_WIDTH 2 | |
51 | #define MT9T031_HORIZONTAL_BLANK 142 | |
52 | #define MT9T031_VERTICAL_BLANK 25 | |
53 | #define MT9T031_COLUMN_SKIP 32 | |
54 | #define MT9T031_ROW_SKIP 20 | |
55 | ||
56 | #define MT9T031_BUS_PARAM (SOCAM_PCLK_SAMPLE_RISING | \ | |
57 | SOCAM_PCLK_SAMPLE_FALLING | SOCAM_HSYNC_ACTIVE_HIGH | \ | |
58 | SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_DATA_ACTIVE_HIGH | \ | |
59 | SOCAM_MASTER | SOCAM_DATAWIDTH_10) | |
60 | ||
61 | static const struct soc_camera_data_format mt9t031_colour_formats[] = { | |
62 | { | |
63 | .name = "Bayer (sRGB) 10 bit", | |
64 | .depth = 10, | |
65 | .fourcc = V4L2_PIX_FMT_SGRBG10, | |
66 | .colorspace = V4L2_COLORSPACE_SRGB, | |
67 | } | |
68 | }; | |
69 | ||
70 | struct mt9t031 { | |
71 | struct i2c_client *client; | |
72 | struct soc_camera_device icd; | |
73 | int model; /* V4L2_IDENT_MT9T031* codes from v4l2-chip-ident.h */ | |
74 | unsigned char autoexposure; | |
75 | u16 xskip; | |
76 | u16 yskip; | |
77 | }; | |
78 | ||
79 | static int reg_read(struct soc_camera_device *icd, const u8 reg) | |
80 | { | |
81 | struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd); | |
82 | struct i2c_client *client = mt9t031->client; | |
83 | s32 data = i2c_smbus_read_word_data(client, reg); | |
84 | return data < 0 ? data : swab16(data); | |
85 | } | |
86 | ||
87 | static int reg_write(struct soc_camera_device *icd, const u8 reg, | |
88 | const u16 data) | |
89 | { | |
90 | struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd); | |
91 | return i2c_smbus_write_word_data(mt9t031->client, reg, swab16(data)); | |
92 | } | |
93 | ||
94 | static int reg_set(struct soc_camera_device *icd, const u8 reg, | |
95 | const u16 data) | |
96 | { | |
97 | int ret; | |
98 | ||
99 | ret = reg_read(icd, reg); | |
100 | if (ret < 0) | |
101 | return ret; | |
102 | return reg_write(icd, reg, ret | data); | |
103 | } | |
104 | ||
105 | static int reg_clear(struct soc_camera_device *icd, const u8 reg, | |
106 | const u16 data) | |
107 | { | |
108 | int ret; | |
109 | ||
110 | ret = reg_read(icd, reg); | |
111 | if (ret < 0) | |
112 | return ret; | |
113 | return reg_write(icd, reg, ret & ~data); | |
114 | } | |
115 | ||
116 | static int set_shutter(struct soc_camera_device *icd, const u32 data) | |
117 | { | |
118 | int ret; | |
119 | ||
120 | ret = reg_write(icd, MT9T031_SHUTTER_WIDTH_UPPER, data >> 16); | |
121 | ||
122 | if (ret >= 0) | |
123 | ret = reg_write(icd, MT9T031_SHUTTER_WIDTH, data & 0xffff); | |
124 | ||
125 | return ret; | |
126 | } | |
127 | ||
128 | static int get_shutter(struct soc_camera_device *icd, u32 *data) | |
129 | { | |
130 | int ret; | |
131 | ||
132 | ret = reg_read(icd, MT9T031_SHUTTER_WIDTH_UPPER); | |
133 | *data = ret << 16; | |
134 | ||
135 | if (ret >= 0) | |
136 | ret = reg_read(icd, MT9T031_SHUTTER_WIDTH); | |
137 | *data |= ret & 0xffff; | |
138 | ||
139 | return ret < 0 ? ret : 0; | |
140 | } | |
141 | ||
142 | static int mt9t031_init(struct soc_camera_device *icd) | |
143 | { | |
144 | int ret; | |
145 | ||
146 | /* Disable chip output, synchronous option update */ | |
147 | dev_dbg(icd->vdev->parent, "%s\n", __func__); | |
148 | ||
149 | ret = reg_write(icd, MT9T031_RESET, 1); | |
150 | if (ret >= 0) | |
151 | ret = reg_write(icd, MT9T031_RESET, 0); | |
152 | if (ret >= 0) | |
153 | ret = reg_clear(icd, MT9T031_OUTPUT_CONTROL, 3); | |
154 | ||
155 | return ret >= 0 ? 0 : -EIO; | |
156 | } | |
157 | ||
158 | static int mt9t031_release(struct soc_camera_device *icd) | |
159 | { | |
160 | /* Disable the chip */ | |
161 | reg_clear(icd, MT9T031_OUTPUT_CONTROL, 3); | |
162 | return 0; | |
163 | } | |
164 | ||
165 | static int mt9t031_start_capture(struct soc_camera_device *icd) | |
166 | { | |
167 | /* Switch to master "normal" mode */ | |
168 | if (reg_set(icd, MT9T031_OUTPUT_CONTROL, 3) < 0) | |
169 | return -EIO; | |
170 | return 0; | |
171 | } | |
172 | ||
173 | static int mt9t031_stop_capture(struct soc_camera_device *icd) | |
174 | { | |
175 | /* Stop sensor readout */ | |
176 | if (reg_clear(icd, MT9T031_OUTPUT_CONTROL, 3) < 0) | |
177 | return -EIO; | |
178 | return 0; | |
179 | } | |
180 | ||
181 | static int mt9t031_set_bus_param(struct soc_camera_device *icd, | |
182 | unsigned long flags) | |
183 | { | |
184 | /* The caller should have queried our parameters, check anyway */ | |
185 | if (flags & ~MT9T031_BUS_PARAM) | |
186 | return -EINVAL; | |
187 | ||
188 | if (flags & SOCAM_PCLK_SAMPLE_FALLING) | |
189 | reg_set(icd, MT9T031_PIXEL_CLOCK_CONTROL, 0x8000); | |
190 | else | |
191 | reg_clear(icd, MT9T031_PIXEL_CLOCK_CONTROL, 0x8000); | |
192 | ||
193 | return 0; | |
194 | } | |
195 | ||
196 | static unsigned long mt9t031_query_bus_param(struct soc_camera_device *icd) | |
197 | { | |
198 | struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd); | |
199 | struct soc_camera_link *icl = mt9t031->client->dev.platform_data; | |
200 | ||
201 | return soc_camera_apply_sensor_flags(icl, MT9T031_BUS_PARAM); | |
202 | } | |
203 | ||
204 | static int mt9t031_set_fmt(struct soc_camera_device *icd, | |
205 | __u32 pixfmt, struct v4l2_rect *rect) | |
206 | { | |
207 | struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd); | |
208 | int ret; | |
209 | const u16 hblank = MT9T031_HORIZONTAL_BLANK, | |
210 | vblank = MT9T031_VERTICAL_BLANK; | |
211 | u16 xbin, xskip = mt9t031->xskip, ybin, yskip = mt9t031->yskip, | |
212 | width = rect->width * xskip, height = rect->height * yskip; | |
213 | ||
214 | if (pixfmt) { | |
215 | /* S_FMT - use binning and skipping for scaling, recalculate */ | |
216 | /* Is this more optimal than just a division? */ | |
217 | for (xskip = 8; xskip > 1; xskip--) | |
218 | if (rect->width * xskip <= icd->width_max) | |
219 | break; | |
220 | ||
221 | for (yskip = 8; yskip > 1; yskip--) | |
222 | if (rect->height * yskip <= icd->height_max) | |
223 | break; | |
224 | ||
225 | width = rect->width * xskip; | |
226 | height = rect->height * yskip; | |
227 | ||
228 | dev_dbg(&icd->dev, "xskip %u, width %u, yskip %u, height %u\n", | |
229 | xskip, width, yskip, height); | |
230 | } | |
231 | ||
232 | xbin = min(xskip, (u16)3); | |
233 | ybin = min(yskip, (u16)3); | |
234 | ||
235 | /* Make sure we don't exceed frame limits */ | |
236 | if (rect->left + width > icd->width_max) | |
237 | rect->left = (icd->width_max - width) / 2; | |
238 | ||
239 | if (rect->top + height > icd->height_max) | |
240 | rect->top = (icd->height_max - height) / 2; | |
241 | ||
242 | /* Could just do roundup(rect->left, [xy]bin); but this is cheaper */ | |
243 | switch (xbin) { | |
244 | case 2: | |
245 | rect->left = (rect->left + 1) & ~1; | |
246 | break; | |
247 | case 3: | |
248 | rect->left = roundup(rect->left, 3); | |
249 | } | |
250 | ||
251 | switch (ybin) { | |
252 | case 2: | |
253 | rect->top = (rect->top + 1) & ~1; | |
254 | break; | |
255 | case 3: | |
256 | rect->top = roundup(rect->top, 3); | |
257 | } | |
258 | ||
259 | /* Blanking and start values - default... */ | |
260 | ret = reg_write(icd, MT9T031_HORIZONTAL_BLANKING, hblank); | |
261 | if (ret >= 0) | |
262 | ret = reg_write(icd, MT9T031_VERTICAL_BLANKING, vblank); | |
263 | ||
264 | if (pixfmt) { | |
265 | /* Binning, skipping */ | |
266 | if (ret >= 0) | |
267 | ret = reg_write(icd, MT9T031_COLUMN_ADDRESS_MODE, | |
268 | ((xbin - 1) << 4) | (xskip - 1)); | |
269 | if (ret >= 0) | |
270 | ret = reg_write(icd, MT9T031_ROW_ADDRESS_MODE, | |
271 | ((ybin - 1) << 4) | (yskip - 1)); | |
272 | } | |
273 | dev_dbg(&icd->dev, "new left %u, top %u\n", rect->left, rect->top); | |
274 | ||
275 | /* The caller provides a supported format, as guaranteed by | |
276 | * icd->try_fmt_cap(), soc_camera_s_crop() and soc_camera_cropcap() */ | |
277 | if (ret >= 0) | |
278 | ret = reg_write(icd, MT9T031_COLUMN_START, rect->left); | |
279 | if (ret >= 0) | |
280 | ret = reg_write(icd, MT9T031_ROW_START, rect->top); | |
281 | if (ret >= 0) | |
282 | ret = reg_write(icd, MT9T031_WINDOW_WIDTH, width - 1); | |
283 | if (ret >= 0) | |
284 | ret = reg_write(icd, MT9T031_WINDOW_HEIGHT, | |
285 | height + icd->y_skip_top - 1); | |
286 | if (ret >= 0 && mt9t031->autoexposure) { | |
287 | ret = set_shutter(icd, height + icd->y_skip_top + vblank); | |
288 | if (ret >= 0) { | |
289 | const u32 shutter_max = MT9T031_MAX_HEIGHT + vblank; | |
290 | const struct v4l2_queryctrl *qctrl = | |
291 | soc_camera_find_qctrl(icd->ops, | |
292 | V4L2_CID_EXPOSURE); | |
293 | icd->exposure = (shutter_max / 2 + (height + | |
294 | icd->y_skip_top + vblank - 1) * | |
295 | (qctrl->maximum - qctrl->minimum)) / | |
296 | shutter_max + qctrl->minimum; | |
297 | } | |
298 | } | |
299 | ||
300 | if (!ret && pixfmt) { | |
301 | mt9t031->xskip = xskip; | |
302 | mt9t031->yskip = yskip; | |
303 | } | |
304 | ||
305 | return ret < 0 ? ret : 0; | |
306 | } | |
307 | ||
308 | static int mt9t031_try_fmt(struct soc_camera_device *icd, | |
309 | struct v4l2_format *f) | |
310 | { | |
311 | struct v4l2_pix_format *pix = &f->fmt.pix; | |
312 | ||
313 | if (pix->height < icd->height_min) | |
314 | pix->height = icd->height_min; | |
315 | if (pix->height > icd->height_max) | |
316 | pix->height = icd->height_max; | |
317 | if (pix->width < icd->width_min) | |
318 | pix->width = icd->width_min; | |
319 | if (pix->width > icd->width_max) | |
320 | pix->width = icd->width_max; | |
321 | ||
322 | pix->width &= ~0x01; /* has to be even */ | |
323 | pix->height &= ~0x01; /* has to be even */ | |
324 | ||
325 | return 0; | |
326 | } | |
327 | ||
328 | static int mt9t031_get_chip_id(struct soc_camera_device *icd, | |
aecde8b5 | 329 | struct v4l2_dbg_chip_ident *id) |
4e96fd08 GL |
330 | { |
331 | struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd); | |
332 | ||
aecde8b5 | 333 | if (id->match.type != V4L2_CHIP_MATCH_I2C_ADDR) |
4e96fd08 GL |
334 | return -EINVAL; |
335 | ||
aecde8b5 | 336 | if (id->match.addr != mt9t031->client->addr) |
4e96fd08 GL |
337 | return -ENODEV; |
338 | ||
339 | id->ident = mt9t031->model; | |
340 | id->revision = 0; | |
341 | ||
342 | return 0; | |
343 | } | |
344 | ||
345 | #ifdef CONFIG_VIDEO_ADV_DEBUG | |
346 | static int mt9t031_get_register(struct soc_camera_device *icd, | |
aecde8b5 | 347 | struct v4l2_dbg_register *reg) |
4e96fd08 GL |
348 | { |
349 | struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd); | |
350 | ||
aecde8b5 | 351 | if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff) |
4e96fd08 GL |
352 | return -EINVAL; |
353 | ||
aecde8b5 | 354 | if (reg->match.addr != mt9t031->client->addr) |
4e96fd08 GL |
355 | return -ENODEV; |
356 | ||
357 | reg->val = reg_read(icd, reg->reg); | |
358 | ||
359 | if (reg->val > 0xffff) | |
360 | return -EIO; | |
361 | ||
362 | return 0; | |
363 | } | |
364 | ||
365 | static int mt9t031_set_register(struct soc_camera_device *icd, | |
aecde8b5 | 366 | struct v4l2_dbg_register *reg) |
4e96fd08 GL |
367 | { |
368 | struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd); | |
369 | ||
aecde8b5 | 370 | if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff) |
4e96fd08 GL |
371 | return -EINVAL; |
372 | ||
aecde8b5 | 373 | if (reg->match.addr != mt9t031->client->addr) |
4e96fd08 GL |
374 | return -ENODEV; |
375 | ||
376 | if (reg_write(icd, reg->reg, reg->val) < 0) | |
377 | return -EIO; | |
378 | ||
379 | return 0; | |
380 | } | |
381 | #endif | |
382 | ||
383 | static const struct v4l2_queryctrl mt9t031_controls[] = { | |
384 | { | |
385 | .id = V4L2_CID_VFLIP, | |
386 | .type = V4L2_CTRL_TYPE_BOOLEAN, | |
387 | .name = "Flip Vertically", | |
388 | .minimum = 0, | |
389 | .maximum = 1, | |
390 | .step = 1, | |
391 | .default_value = 0, | |
392 | }, { | |
393 | .id = V4L2_CID_GAIN, | |
394 | .type = V4L2_CTRL_TYPE_INTEGER, | |
395 | .name = "Gain", | |
396 | .minimum = 0, | |
397 | .maximum = 127, | |
398 | .step = 1, | |
399 | .default_value = 64, | |
400 | .flags = V4L2_CTRL_FLAG_SLIDER, | |
401 | }, { | |
402 | .id = V4L2_CID_EXPOSURE, | |
403 | .type = V4L2_CTRL_TYPE_INTEGER, | |
404 | .name = "Exposure", | |
405 | .minimum = 1, | |
406 | .maximum = 255, | |
407 | .step = 1, | |
408 | .default_value = 255, | |
409 | .flags = V4L2_CTRL_FLAG_SLIDER, | |
410 | }, { | |
411 | .id = V4L2_CID_EXPOSURE_AUTO, | |
412 | .type = V4L2_CTRL_TYPE_BOOLEAN, | |
413 | .name = "Automatic Exposure", | |
414 | .minimum = 0, | |
415 | .maximum = 1, | |
416 | .step = 1, | |
417 | .default_value = 1, | |
418 | } | |
419 | }; | |
420 | ||
421 | static int mt9t031_video_probe(struct soc_camera_device *); | |
422 | static void mt9t031_video_remove(struct soc_camera_device *); | |
423 | static int mt9t031_get_control(struct soc_camera_device *, struct v4l2_control *); | |
424 | static int mt9t031_set_control(struct soc_camera_device *, struct v4l2_control *); | |
425 | ||
426 | static struct soc_camera_ops mt9t031_ops = { | |
427 | .owner = THIS_MODULE, | |
428 | .probe = mt9t031_video_probe, | |
429 | .remove = mt9t031_video_remove, | |
430 | .init = mt9t031_init, | |
431 | .release = mt9t031_release, | |
432 | .start_capture = mt9t031_start_capture, | |
433 | .stop_capture = mt9t031_stop_capture, | |
434 | .set_fmt = mt9t031_set_fmt, | |
435 | .try_fmt = mt9t031_try_fmt, | |
436 | .set_bus_param = mt9t031_set_bus_param, | |
437 | .query_bus_param = mt9t031_query_bus_param, | |
438 | .controls = mt9t031_controls, | |
439 | .num_controls = ARRAY_SIZE(mt9t031_controls), | |
440 | .get_control = mt9t031_get_control, | |
441 | .set_control = mt9t031_set_control, | |
442 | .get_chip_id = mt9t031_get_chip_id, | |
443 | #ifdef CONFIG_VIDEO_ADV_DEBUG | |
444 | .get_register = mt9t031_get_register, | |
445 | .set_register = mt9t031_set_register, | |
446 | #endif | |
447 | }; | |
448 | ||
449 | static int mt9t031_get_control(struct soc_camera_device *icd, struct v4l2_control *ctrl) | |
450 | { | |
451 | struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd); | |
452 | int data; | |
453 | ||
454 | switch (ctrl->id) { | |
455 | case V4L2_CID_VFLIP: | |
456 | data = reg_read(icd, MT9T031_READ_MODE_2); | |
457 | if (data < 0) | |
458 | return -EIO; | |
459 | ctrl->value = !!(data & 0x8000); | |
460 | break; | |
461 | case V4L2_CID_HFLIP: | |
462 | data = reg_read(icd, MT9T031_READ_MODE_2); | |
463 | if (data < 0) | |
464 | return -EIO; | |
465 | ctrl->value = !!(data & 0x4000); | |
466 | break; | |
467 | case V4L2_CID_EXPOSURE_AUTO: | |
468 | ctrl->value = mt9t031->autoexposure; | |
469 | break; | |
470 | } | |
471 | return 0; | |
472 | } | |
473 | ||
474 | static int mt9t031_set_control(struct soc_camera_device *icd, struct v4l2_control *ctrl) | |
475 | { | |
476 | struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd); | |
477 | const struct v4l2_queryctrl *qctrl; | |
478 | int data; | |
479 | ||
480 | qctrl = soc_camera_find_qctrl(&mt9t031_ops, ctrl->id); | |
481 | ||
482 | if (!qctrl) | |
483 | return -EINVAL; | |
484 | ||
485 | switch (ctrl->id) { | |
486 | case V4L2_CID_VFLIP: | |
487 | if (ctrl->value) | |
488 | data = reg_set(icd, MT9T031_READ_MODE_2, 0x8000); | |
489 | else | |
490 | data = reg_clear(icd, MT9T031_READ_MODE_2, 0x8000); | |
491 | if (data < 0) | |
492 | return -EIO; | |
493 | break; | |
494 | case V4L2_CID_HFLIP: | |
495 | if (ctrl->value) | |
496 | data = reg_set(icd, MT9T031_READ_MODE_2, 0x4000); | |
497 | else | |
498 | data = reg_clear(icd, MT9T031_READ_MODE_2, 0x4000); | |
499 | if (data < 0) | |
500 | return -EIO; | |
501 | break; | |
502 | case V4L2_CID_GAIN: | |
503 | if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum) | |
504 | return -EINVAL; | |
505 | /* See Datasheet Table 7, Gain settings. */ | |
506 | if (ctrl->value <= qctrl->default_value) { | |
507 | /* Pack it into 0..1 step 0.125, register values 0..8 */ | |
508 | unsigned long range = qctrl->default_value - qctrl->minimum; | |
509 | data = ((ctrl->value - qctrl->minimum) * 8 + range / 2) / range; | |
510 | ||
511 | dev_dbg(&icd->dev, "Setting gain %d\n", data); | |
512 | data = reg_write(icd, MT9T031_GLOBAL_GAIN, data); | |
513 | if (data < 0) | |
514 | return -EIO; | |
515 | } else { | |
516 | /* Pack it into 1.125..15 variable step, register values 9..67 */ | |
517 | /* We assume qctrl->maximum - qctrl->default_value - 1 > 0 */ | |
518 | unsigned long range = qctrl->maximum - qctrl->default_value - 1; | |
519 | unsigned long gain = ((ctrl->value - qctrl->default_value - 1) * | |
520 | 111 + range / 2) / range + 9; | |
521 | ||
522 | if (gain <= 32) | |
523 | data = gain; | |
524 | else if (gain <= 64) | |
525 | data = ((gain - 32) * 16 + 16) / 32 + 80; | |
526 | else | |
527 | data = ((gain - 64) * 7 + 28) / 56 + 96; | |
528 | ||
529 | dev_dbg(&icd->dev, "Setting gain from %d to %d\n", | |
530 | reg_read(icd, MT9T031_GLOBAL_GAIN), data); | |
531 | data = reg_write(icd, MT9T031_GLOBAL_GAIN, data); | |
532 | if (data < 0) | |
533 | return -EIO; | |
534 | } | |
535 | ||
536 | /* Success */ | |
537 | icd->gain = ctrl->value; | |
538 | break; | |
539 | case V4L2_CID_EXPOSURE: | |
540 | /* mt9t031 has maximum == default */ | |
541 | if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum) | |
542 | return -EINVAL; | |
543 | else { | |
544 | const unsigned long range = qctrl->maximum - qctrl->minimum; | |
545 | const u32 shutter = ((ctrl->value - qctrl->minimum) * 1048 + | |
546 | range / 2) / range + 1; | |
547 | u32 old; | |
548 | ||
549 | get_shutter(icd, &old); | |
550 | dev_dbg(&icd->dev, "Setting shutter width from %u to %u\n", | |
551 | old, shutter); | |
552 | if (set_shutter(icd, shutter) < 0) | |
553 | return -EIO; | |
554 | icd->exposure = ctrl->value; | |
555 | mt9t031->autoexposure = 0; | |
556 | } | |
557 | break; | |
558 | case V4L2_CID_EXPOSURE_AUTO: | |
559 | if (ctrl->value) { | |
560 | const u16 vblank = MT9T031_VERTICAL_BLANK; | |
561 | const u32 shutter_max = MT9T031_MAX_HEIGHT + vblank; | |
562 | if (set_shutter(icd, icd->height + | |
563 | icd->y_skip_top + vblank) < 0) | |
564 | return -EIO; | |
565 | qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_EXPOSURE); | |
566 | icd->exposure = (shutter_max / 2 + (icd->height + | |
567 | icd->y_skip_top + vblank - 1) * | |
568 | (qctrl->maximum - qctrl->minimum)) / | |
569 | shutter_max + qctrl->minimum; | |
570 | mt9t031->autoexposure = 1; | |
571 | } else | |
572 | mt9t031->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 mt9t031_video_probe(struct soc_camera_device *icd) | |
581 | { | |
582 | struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd); | |
583 | s32 data; | |
584 | int ret; | |
585 | ||
586 | /* We must have a parent by now. And it cannot be a wrong one. | |
587 | * So this entire test is completely redundant. */ | |
588 | if (!icd->dev.parent || | |
589 | to_soc_camera_host(icd->dev.parent)->nr != icd->iface) | |
590 | return -ENODEV; | |
591 | ||
592 | /* Enable the chip */ | |
593 | data = reg_write(icd, MT9T031_CHIP_ENABLE, 1); | |
594 | dev_dbg(&icd->dev, "write: %d\n", data); | |
595 | ||
596 | /* Read out the chip version register */ | |
597 | data = reg_read(icd, MT9T031_CHIP_VERSION); | |
598 | ||
599 | switch (data) { | |
600 | case 0x1621: | |
601 | mt9t031->model = V4L2_IDENT_MT9T031; | |
602 | icd->formats = mt9t031_colour_formats; | |
603 | icd->num_formats = ARRAY_SIZE(mt9t031_colour_formats); | |
604 | break; | |
605 | default: | |
606 | ret = -ENODEV; | |
607 | dev_err(&icd->dev, | |
608 | "No MT9T031 chip detected, register read %x\n", data); | |
609 | goto ei2c; | |
610 | } | |
611 | ||
612 | dev_info(&icd->dev, "Detected a MT9T031 chip ID %x\n", data); | |
613 | ||
614 | /* Now that we know the model, we can start video */ | |
615 | ret = soc_camera_video_start(icd); | |
616 | if (ret) | |
617 | goto evstart; | |
618 | ||
619 | return 0; | |
620 | ||
621 | evstart: | |
622 | ei2c: | |
623 | return ret; | |
624 | } | |
625 | ||
626 | static void mt9t031_video_remove(struct soc_camera_device *icd) | |
627 | { | |
628 | struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd); | |
629 | ||
630 | dev_dbg(&icd->dev, "Video %x removed: %p, %p\n", mt9t031->client->addr, | |
631 | icd->dev.parent, icd->vdev); | |
632 | soc_camera_video_stop(icd); | |
633 | } | |
634 | ||
635 | static int mt9t031_probe(struct i2c_client *client, | |
636 | const struct i2c_device_id *did) | |
637 | { | |
638 | struct mt9t031 *mt9t031; | |
639 | struct soc_camera_device *icd; | |
640 | struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); | |
641 | struct soc_camera_link *icl = client->dev.platform_data; | |
642 | int ret; | |
643 | ||
644 | if (!icl) { | |
645 | dev_err(&client->dev, "MT9T031 driver needs platform data\n"); | |
646 | return -EINVAL; | |
647 | } | |
648 | ||
649 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) { | |
650 | dev_warn(&adapter->dev, | |
651 | "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n"); | |
652 | return -EIO; | |
653 | } | |
654 | ||
655 | mt9t031 = kzalloc(sizeof(struct mt9t031), GFP_KERNEL); | |
656 | if (!mt9t031) | |
657 | return -ENOMEM; | |
658 | ||
659 | mt9t031->client = client; | |
660 | i2c_set_clientdata(client, mt9t031); | |
661 | ||
662 | /* Second stage probe - when a capture adapter is there */ | |
663 | icd = &mt9t031->icd; | |
664 | icd->ops = &mt9t031_ops; | |
665 | icd->control = &client->dev; | |
666 | icd->x_min = MT9T031_COLUMN_SKIP; | |
667 | icd->y_min = MT9T031_ROW_SKIP; | |
668 | icd->x_current = icd->x_min; | |
669 | icd->y_current = icd->y_min; | |
670 | icd->width_min = MT9T031_MIN_WIDTH; | |
671 | icd->width_max = MT9T031_MAX_WIDTH; | |
672 | icd->height_min = MT9T031_MIN_HEIGHT; | |
673 | icd->height_max = MT9T031_MAX_HEIGHT; | |
674 | icd->y_skip_top = 0; | |
675 | icd->iface = icl->bus_id; | |
676 | /* Simulated autoexposure. If enabled, we calculate shutter width | |
677 | * ourselves in the driver based on vertical blanking and frame width */ | |
678 | mt9t031->autoexposure = 1; | |
679 | ||
680 | mt9t031->xskip = 1; | |
681 | mt9t031->yskip = 1; | |
682 | ||
683 | ret = soc_camera_device_register(icd); | |
684 | if (ret) | |
685 | goto eisdr; | |
686 | ||
687 | return 0; | |
688 | ||
689 | eisdr: | |
690 | i2c_set_clientdata(client, NULL); | |
691 | kfree(mt9t031); | |
692 | return ret; | |
693 | } | |
694 | ||
695 | static int mt9t031_remove(struct i2c_client *client) | |
696 | { | |
697 | struct mt9t031 *mt9t031 = i2c_get_clientdata(client); | |
698 | ||
699 | soc_camera_device_unregister(&mt9t031->icd); | |
700 | i2c_set_clientdata(client, NULL); | |
701 | kfree(mt9t031); | |
702 | ||
703 | return 0; | |
704 | } | |
705 | ||
706 | static const struct i2c_device_id mt9t031_id[] = { | |
707 | { "mt9t031", 0 }, | |
708 | { } | |
709 | }; | |
710 | MODULE_DEVICE_TABLE(i2c, mt9t031_id); | |
711 | ||
712 | static struct i2c_driver mt9t031_i2c_driver = { | |
713 | .driver = { | |
714 | .name = "mt9t031", | |
715 | }, | |
716 | .probe = mt9t031_probe, | |
717 | .remove = mt9t031_remove, | |
718 | .id_table = mt9t031_id, | |
719 | }; | |
720 | ||
721 | static int __init mt9t031_mod_init(void) | |
722 | { | |
723 | return i2c_add_driver(&mt9t031_i2c_driver); | |
724 | } | |
725 | ||
726 | static void __exit mt9t031_mod_exit(void) | |
727 | { | |
728 | i2c_del_driver(&mt9t031_i2c_driver); | |
729 | } | |
730 | ||
731 | module_init(mt9t031_mod_init); | |
732 | module_exit(mt9t031_mod_exit); | |
733 | ||
734 | MODULE_DESCRIPTION("Micron MT9T031 Camera driver"); | |
735 | MODULE_AUTHOR("Guennadi Liakhovetski <lg@denx.de>"); | |
736 | MODULE_LICENSE("GPL v2"); |