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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
535653b1 11#include <linux/device.h>
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12#include <linux/i2c.h>
13#include <linux/log2.h>
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14#include <linux/pm.h>
15#include <linux/slab.h>
95d20109 16#include <linux/v4l2-mediabus.h>
535653b1 17#include <linux/videodev2.h>
7a707b89 18#include <linux/module.h>
4e96fd08 19
4e96fd08 20#include <media/soc_camera.h>
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21#include <media/v4l2-chip-ident.h>
22#include <media/v4l2-subdev.h>
41efcd7a 23#include <media/v4l2-ctrls.h>
4e96fd08 24
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25/*
26 * ATTENTION: this driver still cannot be used outside of the soc-camera
27 * framework because of its PM implementation, using the video_device node.
28 * If hardware becomes available for testing, alternative PM approaches shall
29 * be considered and tested.
30 */
31
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32/*
33 * mt9t031 i2c address 0x5d
979ea1dd 34 * The platform has to define i2c_board_info and link to it from
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35 * struct soc_camera_link
36 */
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37
38/* mt9t031 selected register addresses */
39#define MT9T031_CHIP_VERSION 0x00
40#define MT9T031_ROW_START 0x01
41#define MT9T031_COLUMN_START 0x02
42#define MT9T031_WINDOW_HEIGHT 0x03
43#define MT9T031_WINDOW_WIDTH 0x04
44#define MT9T031_HORIZONTAL_BLANKING 0x05
45#define MT9T031_VERTICAL_BLANKING 0x06
46#define MT9T031_OUTPUT_CONTROL 0x07
47#define MT9T031_SHUTTER_WIDTH_UPPER 0x08
48#define MT9T031_SHUTTER_WIDTH 0x09
49#define MT9T031_PIXEL_CLOCK_CONTROL 0x0a
50#define MT9T031_FRAME_RESTART 0x0b
51#define MT9T031_SHUTTER_DELAY 0x0c
52#define MT9T031_RESET 0x0d
53#define MT9T031_READ_MODE_1 0x1e
54#define MT9T031_READ_MODE_2 0x20
55#define MT9T031_READ_MODE_3 0x21
56#define MT9T031_ROW_ADDRESS_MODE 0x22
57#define MT9T031_COLUMN_ADDRESS_MODE 0x23
58#define MT9T031_GLOBAL_GAIN 0x35
59#define MT9T031_CHIP_ENABLE 0xF8
60
61#define MT9T031_MAX_HEIGHT 1536
62#define MT9T031_MAX_WIDTH 2048
63#define MT9T031_MIN_HEIGHT 2
6a6c8786 64#define MT9T031_MIN_WIDTH 18
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65#define MT9T031_HORIZONTAL_BLANK 142
66#define MT9T031_VERTICAL_BLANK 25
67#define MT9T031_COLUMN_SKIP 32
68#define MT9T031_ROW_SKIP 20
69
4e96fd08 70struct mt9t031 {
979ea1dd 71 struct v4l2_subdev subdev;
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72 struct v4l2_ctrl_handler hdl;
73 struct {
74 /* exposure/auto-exposure cluster */
75 struct v4l2_ctrl *autoexposure;
76 struct v4l2_ctrl *exposure;
77 };
6a6c8786 78 struct v4l2_rect rect; /* Sensor window */
4e96fd08 79 int model; /* V4L2_IDENT_MT9T031* codes from v4l2-chip-ident.h */
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80 u16 xskip;
81 u16 yskip;
41efcd7a 82 unsigned int total_h;
32536108 83 unsigned short y_skip_top; /* Lines to skip at the top */
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84};
85
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86static struct mt9t031 *to_mt9t031(const struct i2c_client *client)
87{
88 return container_of(i2c_get_clientdata(client), struct mt9t031, subdev);
89}
90
9538e1c2 91static int reg_read(struct i2c_client *client, const u8 reg)
4e96fd08 92{
3f877045 93 return i2c_smbus_read_word_swapped(client, reg);
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94}
95
9538e1c2 96static int reg_write(struct i2c_client *client, const u8 reg,
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97 const u16 data)
98{
3f877045 99 return i2c_smbus_write_word_swapped(client, reg, data);
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100}
101
9538e1c2 102static int reg_set(struct i2c_client *client, const u8 reg,
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103 const u16 data)
104{
105 int ret;
106
9538e1c2 107 ret = reg_read(client, reg);
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108 if (ret < 0)
109 return ret;
9538e1c2 110 return reg_write(client, reg, ret | data);
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111}
112
9538e1c2 113static int reg_clear(struct i2c_client *client, const u8 reg,
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114 const u16 data)
115{
116 int ret;
117
9538e1c2 118 ret = reg_read(client, reg);
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119 if (ret < 0)
120 return ret;
9538e1c2 121 return reg_write(client, reg, ret & ~data);
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122}
123
9538e1c2 124static int set_shutter(struct i2c_client *client, const u32 data)
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125{
126 int ret;
127
9538e1c2 128 ret = reg_write(client, MT9T031_SHUTTER_WIDTH_UPPER, data >> 16);
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129
130 if (ret >= 0)
9538e1c2 131 ret = reg_write(client, MT9T031_SHUTTER_WIDTH, data & 0xffff);
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132
133 return ret;
134}
135
9538e1c2 136static int get_shutter(struct i2c_client *client, u32 *data)
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137{
138 int ret;
139
9538e1c2 140 ret = reg_read(client, MT9T031_SHUTTER_WIDTH_UPPER);
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141 *data = ret << 16;
142
143 if (ret >= 0)
9538e1c2 144 ret = reg_read(client, MT9T031_SHUTTER_WIDTH);
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145 *data |= ret & 0xffff;
146
147 return ret < 0 ? ret : 0;
148}
149
979ea1dd 150static int mt9t031_idle(struct i2c_client *client)
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151{
152 int ret;
153
154 /* Disable chip output, synchronous option update */
9538e1c2 155 ret = reg_write(client, MT9T031_RESET, 1);
4e96fd08 156 if (ret >= 0)
9538e1c2 157 ret = reg_write(client, MT9T031_RESET, 0);
4e96fd08 158 if (ret >= 0)
9538e1c2 159 ret = reg_clear(client, MT9T031_OUTPUT_CONTROL, 2);
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160
161 return ret >= 0 ? 0 : -EIO;
162}
163
979ea1dd 164static int mt9t031_disable(struct i2c_client *client)
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165{
166 /* Disable the chip */
9538e1c2 167 reg_clear(client, MT9T031_OUTPUT_CONTROL, 2);
f9826514 168
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169 return 0;
170}
171
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172static int mt9t031_s_stream(struct v4l2_subdev *sd, int enable)
173{
c4ce6d14 174 struct i2c_client *client = v4l2_get_subdevdata(sd);
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175 int ret;
176
177 if (enable)
178 /* Switch to master "normal" mode */
179 ret = reg_set(client, MT9T031_OUTPUT_CONTROL, 2);
180 else
181 /* Stop sensor readout */
182 ret = reg_clear(client, MT9T031_OUTPUT_CONTROL, 2);
183
184 if (ret < 0)
4e96fd08 185 return -EIO;
979ea1dd 186
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187 return 0;
188}
189
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190/* target must be _even_ */
191static u16 mt9t031_skip(s32 *source, s32 target, s32 max)
70e1d353 192{
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193 unsigned int skip;
194
195 if (*source < target + target / 2) {
196 *source = target;
197 return 1;
198 }
199
200 skip = min(max, *source + target / 2) / target;
201 if (skip > 8)
202 skip = 8;
203 *source = target * skip;
204
205 return skip;
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206}
207
6a6c8786 208/* rect is the sensor rectangle, the caller guarantees parameter validity */
a3a4ac14 209static int mt9t031_set_params(struct i2c_client *client,
09e231b3 210 struct v4l2_rect *rect, u16 xskip, u16 yskip)
4e96fd08 211{
979ea1dd 212 struct mt9t031 *mt9t031 = to_mt9t031(client);
4e96fd08 213 int ret;
6a6c8786 214 u16 xbin, ybin;
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215 const u16 hblank = MT9T031_HORIZONTAL_BLANK,
216 vblank = MT9T031_VERTICAL_BLANK;
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217
218 xbin = min(xskip, (u16)3);
219 ybin = min(yskip, (u16)3);
220
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221 /*
222 * Could just do roundup(rect->left, [xy]bin * 2); but this is cheaper.
223 * There is always a valid suitably aligned value. The worst case is
224 * xbin = 3, width = 2048. Then we will start at 36, the last read out
225 * pixel will be 2083, which is < 2085 - first black pixel.
226 *
227 * MT9T031 datasheet imposes window left border alignment, depending on
228 * the selected xskip. Failing to conform to this requirement produces
229 * dark horizontal stripes in the image. However, even obeying to this
230 * requirement doesn't eliminate the stripes in all configurations. They
231 * appear "locally reproducibly," but can differ between tests under
232 * different lighting conditions.
233 */
4e96fd08 234 switch (xbin) {
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235 case 1:
236 rect->left &= ~1;
4e96fd08 237 break;
4e96fd08 238 case 2:
6a6c8786 239 rect->left &= ~3;
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240 break;
241 case 3:
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242 rect->left = rect->left > roundup(MT9T031_COLUMN_SKIP, 6) ?
243 (rect->left / 6) * 6 : roundup(MT9T031_COLUMN_SKIP, 6);
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244 }
245
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246 rect->top &= ~1;
247
248 dev_dbg(&client->dev, "skip %u:%u, rect %ux%u@%u:%u\n",
249 xskip, yskip, rect->width, rect->height, rect->left, rect->top);
250
70e1d353 251 /* Disable register update, reconfigure atomically */
9538e1c2 252 ret = reg_set(client, MT9T031_OUTPUT_CONTROL, 1);
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253 if (ret < 0)
254 return ret;
255
4e96fd08 256 /* Blanking and start values - default... */
9538e1c2 257 ret = reg_write(client, MT9T031_HORIZONTAL_BLANKING, hblank);
4e96fd08 258 if (ret >= 0)
9538e1c2 259 ret = reg_write(client, MT9T031_VERTICAL_BLANKING, vblank);
4e96fd08 260
09e231b3 261 if (yskip != mt9t031->yskip || xskip != mt9t031->xskip) {
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262 /* Binning, skipping */
263 if (ret >= 0)
9538e1c2 264 ret = reg_write(client, MT9T031_COLUMN_ADDRESS_MODE,
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265 ((xbin - 1) << 4) | (xskip - 1));
266 if (ret >= 0)
9538e1c2 267 ret = reg_write(client, MT9T031_ROW_ADDRESS_MODE,
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268 ((ybin - 1) << 4) | (yskip - 1));
269 }
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270 dev_dbg(&client->dev, "new physical left %u, top %u\n",
271 rect->left, rect->top);
4e96fd08 272
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273 /*
274 * The caller provides a supported format, as guaranteed by
14178aa5 275 * .try_mbus_fmt(), soc_camera_s_crop() and soc_camera_cropcap()
5d28d525 276 */
4e96fd08 277 if (ret >= 0)
6a6c8786 278 ret = reg_write(client, MT9T031_COLUMN_START, rect->left);
4e96fd08 279 if (ret >= 0)
6a6c8786 280 ret = reg_write(client, MT9T031_ROW_START, rect->top);
4e96fd08 281 if (ret >= 0)
6a6c8786 282 ret = reg_write(client, MT9T031_WINDOW_WIDTH, rect->width - 1);
4e96fd08 283 if (ret >= 0)
9538e1c2 284 ret = reg_write(client, MT9T031_WINDOW_HEIGHT,
32536108 285 rect->height + mt9t031->y_skip_top - 1);
41efcd7a
HV
286 if (ret >= 0 && v4l2_ctrl_g_ctrl(mt9t031->autoexposure) == V4L2_EXPOSURE_AUTO) {
287 mt9t031->total_h = rect->height + mt9t031->y_skip_top + vblank;
288
289 ret = set_shutter(client, mt9t031->total_h);
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290 }
291
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292 /* Re-enable register update, commit all changes */
293 if (ret >= 0)
9538e1c2 294 ret = reg_clear(client, MT9T031_OUTPUT_CONTROL, 1);
09e231b3 295
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296 if (ret >= 0) {
297 mt9t031->rect = *rect;
298 mt9t031->xskip = xskip;
299 mt9t031->yskip = yskip;
300 }
301
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302 return ret < 0 ? ret : 0;
303}
304
08590b96 305static int mt9t031_s_crop(struct v4l2_subdev *sd, struct v4l2_crop *a)
09e231b3 306{
6a6c8786 307 struct v4l2_rect rect = a->c;
c4ce6d14 308 struct i2c_client *client = v4l2_get_subdevdata(sd);
979ea1dd 309 struct mt9t031 *mt9t031 = to_mt9t031(client);
09e231b3 310
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311 rect.width = ALIGN(rect.width, 2);
312 rect.height = ALIGN(rect.height, 2);
313
314 soc_camera_limit_side(&rect.left, &rect.width,
315 MT9T031_COLUMN_SKIP, MT9T031_MIN_WIDTH, MT9T031_MAX_WIDTH);
316
317 soc_camera_limit_side(&rect.top, &rect.height,
318 MT9T031_ROW_SKIP, MT9T031_MIN_HEIGHT, MT9T031_MAX_HEIGHT);
319
a3a4ac14 320 return mt9t031_set_params(client, &rect, mt9t031->xskip, mt9t031->yskip);
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321}
322
323static int mt9t031_g_crop(struct v4l2_subdev *sd, struct v4l2_crop *a)
324{
c4ce6d14 325 struct i2c_client *client = v4l2_get_subdevdata(sd);
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326 struct mt9t031 *mt9t031 = to_mt9t031(client);
327
328 a->c = mt9t031->rect;
329 a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
e330919a 330
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331 return 0;
332}
333
334static int mt9t031_cropcap(struct v4l2_subdev *sd, struct v4l2_cropcap *a)
335{
336 a->bounds.left = MT9T031_COLUMN_SKIP;
337 a->bounds.top = MT9T031_ROW_SKIP;
338 a->bounds.width = MT9T031_MAX_WIDTH;
339 a->bounds.height = MT9T031_MAX_HEIGHT;
340 a->defrect = a->bounds;
341 a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
342 a->pixelaspect.numerator = 1;
343 a->pixelaspect.denominator = 1;
e330919a 344
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345 return 0;
346}
347
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348static int mt9t031_g_fmt(struct v4l2_subdev *sd,
349 struct v4l2_mbus_framefmt *mf)
6a6c8786 350{
c4ce6d14 351 struct i2c_client *client = v4l2_get_subdevdata(sd);
6a6c8786 352 struct mt9t031 *mt9t031 = to_mt9t031(client);
6a6c8786 353
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354 mf->width = mt9t031->rect.width / mt9t031->xskip;
355 mf->height = mt9t031->rect.height / mt9t031->yskip;
356 mf->code = V4L2_MBUS_FMT_SBGGR10_1X10;
357 mf->colorspace = V4L2_COLORSPACE_SRGB;
358 mf->field = V4L2_FIELD_NONE;
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359
360 return 0;
09e231b3
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361}
362
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363static int mt9t031_s_fmt(struct v4l2_subdev *sd,
364 struct v4l2_mbus_framefmt *mf)
09e231b3 365{
c4ce6d14 366 struct i2c_client *client = v4l2_get_subdevdata(sd);
979ea1dd 367 struct mt9t031 *mt9t031 = to_mt9t031(client);
09e231b3 368 u16 xskip, yskip;
6a6c8786 369 struct v4l2_rect rect = mt9t031->rect;
09e231b3
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370
371 /*
6a6c8786
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372 * try_fmt has put width and height within limits.
373 * S_FMT: use binning and skipping for scaling
09e231b3 374 */
760697be
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375 xskip = mt9t031_skip(&rect.width, mf->width, MT9T031_MAX_WIDTH);
376 yskip = mt9t031_skip(&rect.height, mf->height, MT9T031_MAX_HEIGHT);
377
378 mf->code = V4L2_MBUS_FMT_SBGGR10_1X10;
379 mf->colorspace = V4L2_COLORSPACE_SRGB;
4e96fd08 380
6a6c8786 381 /* mt9t031_set_params() doesn't change width and height */
a3a4ac14 382 return mt9t031_set_params(client, &rect, xskip, yskip);
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383}
384
6a6c8786
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385/*
386 * If a user window larger than sensor window is requested, we'll increase the
387 * sensor window.
388 */
760697be
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389static int mt9t031_try_fmt(struct v4l2_subdev *sd,
390 struct v4l2_mbus_framefmt *mf)
4e96fd08 391{
653dc59b 392 v4l_bound_align_image(
760697be
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393 &mf->width, MT9T031_MIN_WIDTH, MT9T031_MAX_WIDTH, 1,
394 &mf->height, MT9T031_MIN_HEIGHT, MT9T031_MAX_HEIGHT, 1, 0);
395
396 mf->code = V4L2_MBUS_FMT_SBGGR10_1X10;
397 mf->colorspace = V4L2_COLORSPACE_SRGB;
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398
399 return 0;
400}
401
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402static int mt9t031_g_chip_ident(struct v4l2_subdev *sd,
403 struct v4l2_dbg_chip_ident *id)
4e96fd08 404{
c4ce6d14 405 struct i2c_client *client = v4l2_get_subdevdata(sd);
979ea1dd 406 struct mt9t031 *mt9t031 = to_mt9t031(client);
4e96fd08 407
aecde8b5 408 if (id->match.type != V4L2_CHIP_MATCH_I2C_ADDR)
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409 return -EINVAL;
410
40e2e092 411 if (id->match.addr != client->addr)
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412 return -ENODEV;
413
414 id->ident = mt9t031->model;
415 id->revision = 0;
416
417 return 0;
418}
419
420#ifdef CONFIG_VIDEO_ADV_DEBUG
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421static int mt9t031_g_register(struct v4l2_subdev *sd,
422 struct v4l2_dbg_register *reg)
4e96fd08 423{
c4ce6d14 424 struct i2c_client *client = v4l2_get_subdevdata(sd);
4e96fd08 425
aecde8b5 426 if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
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427 return -EINVAL;
428
9538e1c2 429 if (reg->match.addr != client->addr)
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430 return -ENODEV;
431
9538e1c2 432 reg->val = reg_read(client, reg->reg);
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433
434 if (reg->val > 0xffff)
435 return -EIO;
436
437 return 0;
438}
439
979ea1dd
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440static int mt9t031_s_register(struct v4l2_subdev *sd,
441 struct v4l2_dbg_register *reg)
4e96fd08 442{
c4ce6d14 443 struct i2c_client *client = v4l2_get_subdevdata(sd);
4e96fd08 444
aecde8b5 445 if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
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446 return -EINVAL;
447
9538e1c2 448 if (reg->match.addr != client->addr)
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449 return -ENODEV;
450
9538e1c2 451 if (reg_write(client, reg->reg, reg->val) < 0)
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452 return -EIO;
453
454 return 0;
455}
456#endif
457
41efcd7a 458static int mt9t031_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
4e96fd08 459{
41efcd7a
HV
460 struct mt9t031 *mt9t031 = container_of(ctrl->handler,
461 struct mt9t031, hdl);
462 const u32 shutter_max = MT9T031_MAX_HEIGHT + MT9T031_VERTICAL_BLANK;
463 s32 min, max;
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464
465 switch (ctrl->id) {
4e96fd08 466 case V4L2_CID_EXPOSURE_AUTO:
41efcd7a
HV
467 min = mt9t031->exposure->minimum;
468 max = mt9t031->exposure->maximum;
469 mt9t031->exposure->val =
470 (shutter_max / 2 + (mt9t031->total_h - 1) * (max - min))
471 / shutter_max + min;
96c75399 472 break;
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473 }
474 return 0;
475}
476
41efcd7a 477static int mt9t031_s_ctrl(struct v4l2_ctrl *ctrl)
4e96fd08 478{
41efcd7a
HV
479 struct mt9t031 *mt9t031 = container_of(ctrl->handler,
480 struct mt9t031, hdl);
481 struct v4l2_subdev *sd = &mt9t031->subdev;
c4ce6d14 482 struct i2c_client *client = v4l2_get_subdevdata(sd);
41efcd7a 483 struct v4l2_ctrl *exp = mt9t031->exposure;
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484 int data;
485
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486 switch (ctrl->id) {
487 case V4L2_CID_VFLIP:
41efcd7a 488 if (ctrl->val)
9538e1c2 489 data = reg_set(client, MT9T031_READ_MODE_2, 0x8000);
4e96fd08 490 else
9538e1c2 491 data = reg_clear(client, MT9T031_READ_MODE_2, 0x8000);
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492 if (data < 0)
493 return -EIO;
41efcd7a 494 return 0;
4e96fd08 495 case V4L2_CID_HFLIP:
41efcd7a 496 if (ctrl->val)
9538e1c2 497 data = reg_set(client, MT9T031_READ_MODE_2, 0x4000);
4e96fd08 498 else
9538e1c2 499 data = reg_clear(client, MT9T031_READ_MODE_2, 0x4000);
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500 if (data < 0)
501 return -EIO;
41efcd7a 502 return 0;
4e96fd08 503 case V4L2_CID_GAIN:
4e96fd08 504 /* See Datasheet Table 7, Gain settings. */
41efcd7a 505 if (ctrl->val <= ctrl->default_value) {
4e96fd08 506 /* Pack it into 0..1 step 0.125, register values 0..8 */
41efcd7a
HV
507 unsigned long range = ctrl->default_value - ctrl->minimum;
508 data = ((ctrl->val - ctrl->minimum) * 8 + range / 2) / range;
4e96fd08 509
85f8be68 510 dev_dbg(&client->dev, "Setting gain %d\n", data);
9538e1c2 511 data = reg_write(client, MT9T031_GLOBAL_GAIN, data);
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GL
512 if (data < 0)
513 return -EIO;
514 } else {
70e1d353 515 /* Pack it into 1.125..128 variable step, register values 9..0x7860 */
4e96fd08 516 /* We assume qctrl->maximum - qctrl->default_value - 1 > 0 */
41efcd7a 517 unsigned long range = ctrl->maximum - ctrl->default_value - 1;
70e1d353 518 /* calculated gain: map 65..127 to 9..1024 step 0.125 */
41efcd7a 519 unsigned long gain = ((ctrl->val - ctrl->default_value - 1) *
70e1d353 520 1015 + range / 2) / range + 9;
4e96fd08 521
70e1d353 522 if (gain <= 32) /* calculated gain 9..32 -> 9..32 */
4e96fd08 523 data = gain;
70e1d353 524 else if (gain <= 64) /* calculated gain 33..64 -> 0x51..0x60 */
4e96fd08
GL
525 data = ((gain - 32) * 16 + 16) / 32 + 80;
526 else
70e1d353
GL
527 /* calculated gain 65..1024 -> (1..120) << 8 + 0x60 */
528 data = (((gain - 64 + 7) * 32) & 0xff00) | 0x60;
4e96fd08 529
85f8be68 530 dev_dbg(&client->dev, "Set gain from 0x%x to 0x%x\n",
9538e1c2
GL
531 reg_read(client, MT9T031_GLOBAL_GAIN), data);
532 data = reg_write(client, MT9T031_GLOBAL_GAIN, data);
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GL
533 if (data < 0)
534 return -EIO;
535 }
41efcd7a 536 return 0;
4e96fd08 537
41efcd7a
HV
538 case V4L2_CID_EXPOSURE_AUTO:
539 if (ctrl->val == V4L2_EXPOSURE_MANUAL) {
540 unsigned int range = exp->maximum - exp->minimum;
541 unsigned int shutter = ((exp->val - exp->minimum) * 1048 +
542 range / 2) / range + 1;
4e96fd08
GL
543 u32 old;
544
9538e1c2 545 get_shutter(client, &old);
85f8be68 546 dev_dbg(&client->dev, "Set shutter from %u to %u\n",
4e96fd08 547 old, shutter);
9538e1c2 548 if (set_shutter(client, shutter) < 0)
4e96fd08 549 return -EIO;
41efcd7a 550 } else {
4e96fd08 551 const u16 vblank = MT9T031_VERTICAL_BLANK;
41efcd7a 552 mt9t031->total_h = mt9t031->rect.height +
32536108 553 mt9t031->y_skip_top + vblank;
96c75399 554
41efcd7a 555 if (set_shutter(client, mt9t031->total_h) < 0)
4e96fd08 556 return -EIO;
41efcd7a
HV
557 }
558 return 0;
a3a4ac14
GL
559 default:
560 return -EINVAL;
4e96fd08
GL
561 }
562 return 0;
563}
564
535653b1
VL
565/*
566 * Power Management:
567 * This function does nothing for now but must be present for pm to work
568 */
569static int mt9t031_runtime_suspend(struct device *dev)
570{
571 return 0;
572}
573
574/*
575 * Power Management:
576 * COLUMN_ADDRESS_MODE and ROW_ADDRESS_MODE are not rewritten if unchanged
577 * they are however changed at reset if the platform hook is present
578 * thus we rewrite them with the values stored by the driver
579 */
580static int mt9t031_runtime_resume(struct device *dev)
581{
582 struct video_device *vdev = to_video_device(dev);
14178aa5 583 struct v4l2_subdev *sd = soc_camera_vdev_to_subdev(vdev);
c4ce6d14 584 struct i2c_client *client = v4l2_get_subdevdata(sd);
535653b1
VL
585 struct mt9t031 *mt9t031 = to_mt9t031(client);
586
587 int ret;
588 u16 xbin, ybin;
589
590 xbin = min(mt9t031->xskip, (u16)3);
591 ybin = min(mt9t031->yskip, (u16)3);
592
593 ret = reg_write(client, MT9T031_COLUMN_ADDRESS_MODE,
594 ((xbin - 1) << 4) | (mt9t031->xskip - 1));
595 if (ret < 0)
596 return ret;
597
598 ret = reg_write(client, MT9T031_ROW_ADDRESS_MODE,
599 ((ybin - 1) << 4) | (mt9t031->yskip - 1));
600 if (ret < 0)
601 return ret;
602
603 return 0;
604}
605
606static struct dev_pm_ops mt9t031_dev_pm_ops = {
607 .runtime_suspend = mt9t031_runtime_suspend,
608 .runtime_resume = mt9t031_runtime_resume,
609};
610
611static struct device_type mt9t031_dev_type = {
612 .name = "MT9T031",
613 .pm = &mt9t031_dev_pm_ops,
614};
615
2f0babb7
GL
616static int mt9t031_s_power(struct v4l2_subdev *sd, int on)
617{
618 struct i2c_client *client = v4l2_get_subdevdata(sd);
619 struct video_device *vdev = soc_camera_i2c_to_vdev(client);
620
621 if (on)
622 vdev->dev.type = &mt9t031_dev_type;
623 else
624 vdev->dev.type = NULL;
625
626 return 0;
627}
628
5d28d525
GL
629/*
630 * Interface active, can use i2c. If it fails, it can indeed mean, that
631 * this wasn't our capture interface, so, we wait for the right one
632 */
979ea1dd 633static int mt9t031_video_probe(struct i2c_client *client)
4e96fd08 634{
979ea1dd 635 struct mt9t031 *mt9t031 = to_mt9t031(client);
4e96fd08 636 s32 data;
a4c56fd8 637 int ret;
4e96fd08 638
4e96fd08 639 /* Enable the chip */
9538e1c2 640 data = reg_write(client, MT9T031_CHIP_ENABLE, 1);
85f8be68 641 dev_dbg(&client->dev, "write: %d\n", data);
4e96fd08
GL
642
643 /* Read out the chip version register */
9538e1c2 644 data = reg_read(client, MT9T031_CHIP_VERSION);
4e96fd08
GL
645
646 switch (data) {
647 case 0x1621:
648 mt9t031->model = V4L2_IDENT_MT9T031;
4e96fd08
GL
649 break;
650 default:
85f8be68 651 dev_err(&client->dev,
4e96fd08 652 "No MT9T031 chip detected, register read %x\n", data);
40e2e092 653 return -ENODEV;
4e96fd08
GL
654 }
655
85f8be68 656 dev_info(&client->dev, "Detected a MT9T031 chip ID %x\n", data);
4e96fd08 657
a4c56fd8 658 ret = mt9t031_idle(client);
2f0babb7 659 if (ret < 0)
a4c56fd8 660 dev_err(&client->dev, "Failed to initialise the camera\n");
2f0babb7 661 else
41efcd7a 662 v4l2_ctrl_handler_setup(&mt9t031->hdl);
2f0babb7 663
a4c56fd8 664 return ret;
4e96fd08
GL
665}
666
32536108
GL
667static int mt9t031_g_skip_top_lines(struct v4l2_subdev *sd, u32 *lines)
668{
c4ce6d14 669 struct i2c_client *client = v4l2_get_subdevdata(sd);
32536108
GL
670 struct mt9t031 *mt9t031 = to_mt9t031(client);
671
672 *lines = mt9t031->y_skip_top;
673
674 return 0;
675}
676
41efcd7a
HV
677static const struct v4l2_ctrl_ops mt9t031_ctrl_ops = {
678 .g_volatile_ctrl = mt9t031_g_volatile_ctrl,
679 .s_ctrl = mt9t031_s_ctrl,
680};
681
979ea1dd 682static struct v4l2_subdev_core_ops mt9t031_subdev_core_ops = {
979ea1dd 683 .g_chip_ident = mt9t031_g_chip_ident,
2f0babb7 684 .s_power = mt9t031_s_power,
979ea1dd
GL
685#ifdef CONFIG_VIDEO_ADV_DEBUG
686 .g_register = mt9t031_g_register,
687 .s_register = mt9t031_s_register,
688#endif
689};
690
3805f201 691static int mt9t031_enum_fmt(struct v4l2_subdev *sd, unsigned int index,
760697be
GL
692 enum v4l2_mbus_pixelcode *code)
693{
694 if (index)
695 return -EINVAL;
696
697 *code = V4L2_MBUS_FMT_SBGGR10_1X10;
698 return 0;
699}
700
a3505755
GL
701static int mt9t031_g_mbus_config(struct v4l2_subdev *sd,
702 struct v4l2_mbus_config *cfg)
703{
704 struct i2c_client *client = v4l2_get_subdevdata(sd);
14178aa5 705 struct soc_camera_link *icl = soc_camera_i2c_to_link(client);
a3505755
GL
706
707 cfg->flags = V4L2_MBUS_MASTER | V4L2_MBUS_PCLK_SAMPLE_RISING |
708 V4L2_MBUS_PCLK_SAMPLE_FALLING | V4L2_MBUS_HSYNC_ACTIVE_HIGH |
709 V4L2_MBUS_VSYNC_ACTIVE_HIGH | V4L2_MBUS_DATA_ACTIVE_HIGH;
710 cfg->type = V4L2_MBUS_PARALLEL;
711 cfg->flags = soc_camera_apply_board_flags(icl, cfg);
712
713 return 0;
714}
715
716static int mt9t031_s_mbus_config(struct v4l2_subdev *sd,
717 const struct v4l2_mbus_config *cfg)
718{
719 struct i2c_client *client = v4l2_get_subdevdata(sd);
14178aa5 720 struct soc_camera_link *icl = soc_camera_i2c_to_link(client);
a3505755
GL
721
722 if (soc_camera_apply_board_flags(icl, cfg) &
723 V4L2_MBUS_PCLK_SAMPLE_FALLING)
724 return reg_clear(client, MT9T031_PIXEL_CLOCK_CONTROL, 0x8000);
725 else
726 return reg_set(client, MT9T031_PIXEL_CLOCK_CONTROL, 0x8000);
727}
728
979ea1dd
GL
729static struct v4l2_subdev_video_ops mt9t031_subdev_video_ops = {
730 .s_stream = mt9t031_s_stream,
760697be
GL
731 .s_mbus_fmt = mt9t031_s_fmt,
732 .g_mbus_fmt = mt9t031_g_fmt,
733 .try_mbus_fmt = mt9t031_try_fmt,
08590b96 734 .s_crop = mt9t031_s_crop,
6a6c8786
GL
735 .g_crop = mt9t031_g_crop,
736 .cropcap = mt9t031_cropcap,
760697be 737 .enum_mbus_fmt = mt9t031_enum_fmt,
a3505755
GL
738 .g_mbus_config = mt9t031_g_mbus_config,
739 .s_mbus_config = mt9t031_s_mbus_config,
979ea1dd
GL
740};
741
32536108
GL
742static struct v4l2_subdev_sensor_ops mt9t031_subdev_sensor_ops = {
743 .g_skip_top_lines = mt9t031_g_skip_top_lines,
744};
745
979ea1dd
GL
746static struct v4l2_subdev_ops mt9t031_subdev_ops = {
747 .core = &mt9t031_subdev_core_ops,
748 .video = &mt9t031_subdev_video_ops,
32536108 749 .sensor = &mt9t031_subdev_sensor_ops,
979ea1dd
GL
750};
751
4e96fd08
GL
752static int mt9t031_probe(struct i2c_client *client,
753 const struct i2c_device_id *did)
754{
755 struct mt9t031 *mt9t031;
14178aa5 756 struct soc_camera_link *icl = soc_camera_i2c_to_link(client);
4e96fd08 757 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
4e96fd08
GL
758 int ret;
759
14178aa5
GL
760 if (!icl) {
761 dev_err(&client->dev, "MT9T031 driver needs platform data\n");
762 return -EINVAL;
4e96fd08
GL
763 }
764
765 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
766 dev_warn(&adapter->dev,
767 "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
768 return -EIO;
769 }
770
771 mt9t031 = kzalloc(sizeof(struct mt9t031), GFP_KERNEL);
772 if (!mt9t031)
773 return -ENOMEM;
774
979ea1dd 775 v4l2_i2c_subdev_init(&mt9t031->subdev, client, &mt9t031_subdev_ops);
41efcd7a
HV
776 v4l2_ctrl_handler_init(&mt9t031->hdl, 5);
777 v4l2_ctrl_new_std(&mt9t031->hdl, &mt9t031_ctrl_ops,
778 V4L2_CID_VFLIP, 0, 1, 1, 0);
779 v4l2_ctrl_new_std(&mt9t031->hdl, &mt9t031_ctrl_ops,
780 V4L2_CID_HFLIP, 0, 1, 1, 0);
781 v4l2_ctrl_new_std(&mt9t031->hdl, &mt9t031_ctrl_ops,
782 V4L2_CID_GAIN, 0, 127, 1, 64);
783
784 /*
785 * Simulated autoexposure. If enabled, we calculate shutter width
786 * ourselves in the driver based on vertical blanking and frame width
787 */
788 mt9t031->autoexposure = v4l2_ctrl_new_std_menu(&mt9t031->hdl,
789 &mt9t031_ctrl_ops, V4L2_CID_EXPOSURE_AUTO, 1, 0,
790 V4L2_EXPOSURE_AUTO);
791 mt9t031->exposure = v4l2_ctrl_new_std(&mt9t031->hdl, &mt9t031_ctrl_ops,
792 V4L2_CID_EXPOSURE, 1, 255, 1, 255);
793
794 mt9t031->subdev.ctrl_handler = &mt9t031->hdl;
795 if (mt9t031->hdl.error) {
796 int err = mt9t031->hdl.error;
797
798 kfree(mt9t031);
799 return err;
800 }
801 v4l2_ctrl_auto_cluster(2, &mt9t031->autoexposure,
802 V4L2_EXPOSURE_MANUAL, true);
4e96fd08 803
32536108 804 mt9t031->y_skip_top = 0;
6a6c8786
GL
805 mt9t031->rect.left = MT9T031_COLUMN_SKIP;
806 mt9t031->rect.top = MT9T031_ROW_SKIP;
807 mt9t031->rect.width = MT9T031_MAX_WIDTH;
808 mt9t031->rect.height = MT9T031_MAX_HEIGHT;
809
4e96fd08
GL
810 mt9t031->xskip = 1;
811 mt9t031->yskip = 1;
812
979ea1dd
GL
813 mt9t031_idle(client);
814
815 ret = mt9t031_video_probe(client);
816
817 mt9t031_disable(client);
818
40e2e092 819 if (ret) {
41efcd7a 820 v4l2_ctrl_handler_free(&mt9t031->hdl);
40e2e092
GL
821 kfree(mt9t031);
822 }
4e96fd08 823
4e96fd08
GL
824 return ret;
825}
826
827static int mt9t031_remove(struct i2c_client *client)
828{
979ea1dd 829 struct mt9t031 *mt9t031 = to_mt9t031(client);
4e96fd08 830
41efcd7a
HV
831 v4l2_device_unregister_subdev(&mt9t031->subdev);
832 v4l2_ctrl_handler_free(&mt9t031->hdl);
4e96fd08
GL
833 kfree(mt9t031);
834
835 return 0;
836}
837
838static const struct i2c_device_id mt9t031_id[] = {
839 { "mt9t031", 0 },
840 { }
841};
842MODULE_DEVICE_TABLE(i2c, mt9t031_id);
843
844static struct i2c_driver mt9t031_i2c_driver = {
845 .driver = {
846 .name = "mt9t031",
847 },
848 .probe = mt9t031_probe,
849 .remove = mt9t031_remove,
850 .id_table = mt9t031_id,
851};
852
c6e8d86f 853module_i2c_driver(mt9t031_i2c_driver);
4e96fd08
GL
854
855MODULE_DESCRIPTION("Micron MT9T031 Camera driver");
856MODULE_AUTHOR("Guennadi Liakhovetski <lg@denx.de>");
857MODULE_LICENSE("GPL v2");