1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * V4L2 subdevice driver for OmniVision OV6650 Camera Sensor
4 *
5 * Copyright (C) 2010 Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>
6 *
7 * Based on OmniVision OV96xx Camera Driver
8 * Copyright (C) 2009 Marek Vasut <marek.vasut@gmail.com>
9 *
10 * Based on ov772x camera driver:
11 * Copyright (C) 2008 Renesas Solutions Corp.
12 * Kuninori Morimoto <morimoto.kuninori@renesas.com>
13 *
14 * Based on ov7670 and soc_camera_platform driver,
15 * Copyright 2006-7 Jonathan Corbet <corbet@lwn.net>
16 * Copyright (C) 2008 Magnus Damm
17 * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
18 *
19 * Hardware specific bits initially based on former work by Matt Callow
20 * drivers/media/video/omap/sensor_ov6650.c
21 * Copyright (C) 2006 Matt Callow
22 */
23
24 #include <linux/bitops.h>
25 #include <linux/clk.h>
26 #include <linux/delay.h>
27 #include <linux/i2c.h>
28 #include <linux/slab.h>
29 #include <linux/v4l2-mediabus.h>
30 #include <linux/module.h>
31
32 #include <media/v4l2-ctrls.h>
33 #include <media/v4l2-device.h>
34
35 /* Register definitions */
36 #define REG_GAIN 0x00 /* range 00 - 3F */
37 #define REG_BLUE 0x01
38 #define REG_RED 0x02
39 #define REG_SAT 0x03 /* [7:4] saturation [0:3] reserved */
40 #define REG_HUE 0x04 /* [7:6] rsrvd [5] hue en [4:0] hue */
41
42 #define REG_BRT 0x06
43
44 #define REG_PIDH 0x0a
45 #define REG_PIDL 0x0b
46
47 #define REG_AECH 0x10
48 #define REG_CLKRC 0x11 /* Data Format and Internal Clock */
49 /* [7:6] Input system clock (MHz)*/
50 /* 00=8, 01=12, 10=16, 11=24 */
51 /* [5:0]: Internal Clock Pre-Scaler */
52 #define REG_COMA 0x12 /* [7] Reset */
53 #define REG_COMB 0x13
54 #define REG_COMC 0x14
55 #define REG_COMD 0x15
56 #define REG_COML 0x16
57 #define REG_HSTRT 0x17
58 #define REG_HSTOP 0x18
59 #define REG_VSTRT 0x19
60 #define REG_VSTOP 0x1a
61 #define REG_PSHFT 0x1b
62 #define REG_MIDH 0x1c
63 #define REG_MIDL 0x1d
64 #define REG_HSYNS 0x1e
65 #define REG_HSYNE 0x1f
66 #define REG_COME 0x20
67 #define REG_YOFF 0x21
68 #define REG_UOFF 0x22
69 #define REG_VOFF 0x23
70 #define REG_AEW 0x24
71 #define REG_AEB 0x25
72 #define REG_COMF 0x26
73 #define REG_COMG 0x27
74 #define REG_COMH 0x28
75 #define REG_COMI 0x29
76
77 #define REG_FRARL 0x2b
78 #define REG_COMJ 0x2c
79 #define REG_COMK 0x2d
80 #define REG_AVGY 0x2e
81 #define REG_REF0 0x2f
82 #define REG_REF1 0x30
83 #define REG_REF2 0x31
84 #define REG_FRAJH 0x32
85 #define REG_FRAJL 0x33
86 #define REG_FACT 0x34
87 #define REG_L1AEC 0x35
88 #define REG_AVGU 0x36
89 #define REG_AVGV 0x37
90
91 #define REG_SPCB 0x60
92 #define REG_SPCC 0x61
93 #define REG_GAM1 0x62
94 #define REG_GAM2 0x63
95 #define REG_GAM3 0x64
96 #define REG_SPCD 0x65
97
98 #define REG_SPCE 0x68
99 #define REG_ADCL 0x69
100
101 #define REG_RMCO 0x6c
102 #define REG_GMCO 0x6d
103 #define REG_BMCO 0x6e
104
105
106 /* Register bits, values, etc. */
107 #define OV6650_PIDH 0x66 /* high byte of product ID number */
108 #define OV6650_PIDL 0x50 /* low byte of product ID number */
109 #define OV6650_MIDH 0x7F /* high byte of mfg ID */
110 #define OV6650_MIDL 0xA2 /* low byte of mfg ID */
111
112 #define DEF_GAIN 0x00
113 #define DEF_BLUE 0x80
114 #define DEF_RED 0x80
115
116 #define SAT_SHIFT 4
117 #define SAT_MASK (0xf << SAT_SHIFT)
118 #define SET_SAT(x) (((x) << SAT_SHIFT) & SAT_MASK)
119
120 #define HUE_EN BIT(5)
121 #define HUE_MASK 0x1f
122 #define DEF_HUE 0x10
123 #define SET_HUE(x) (HUE_EN | ((x) & HUE_MASK))
124
125 #define DEF_AECH 0x4D
126
127 #define CLKRC_8MHz 0x00
128 #define CLKRC_12MHz 0x40
129 #define CLKRC_16MHz 0x80
130 #define CLKRC_24MHz 0xc0
131 #define CLKRC_DIV_MASK 0x3f
132 #define GET_CLKRC_DIV(x) (((x) & CLKRC_DIV_MASK) + 1)
133 #define DEF_CLKRC 0x00
134
135 #define COMA_RESET BIT(7)
136 #define COMA_QCIF BIT(5)
137 #define COMA_RAW_RGB BIT(4)
138 #define COMA_RGB BIT(3)
139 #define COMA_BW BIT(2)
140 #define COMA_WORD_SWAP BIT(1)
141 #define COMA_BYTE_SWAP BIT(0)
142 #define DEF_COMA 0x00
143
144 #define COMB_FLIP_V BIT(7)
145 #define COMB_FLIP_H BIT(5)
146 #define COMB_BAND_FILTER BIT(4)
147 #define COMB_AWB BIT(2)
148 #define COMB_AGC BIT(1)
149 #define COMB_AEC BIT(0)
150 #define DEF_COMB 0x5f
151
152 #define COML_ONE_CHANNEL BIT(7)
153
154 #define DEF_HSTRT 0x24
155 #define DEF_HSTOP 0xd4
156 #define DEF_VSTRT 0x04
157 #define DEF_VSTOP 0x94
158
159 #define COMF_HREF_LOW BIT(4)
160
161 #define COMJ_PCLK_RISING BIT(4)
162 #define COMJ_VSYNC_HIGH BIT(0)
163
164 /* supported resolutions */
165 #define W_QCIF (DEF_HSTOP - DEF_HSTRT)
166 #define W_CIF (W_QCIF << 1)
167 #define H_QCIF (DEF_VSTOP - DEF_VSTRT)
168 #define H_CIF (H_QCIF << 1)
169
170 #define FRAME_RATE_MAX 30
171
172
173 struct ov6650_reg {
174 u8 reg;
175 u8 val;
176 };
177
178 struct ov6650 {
179 struct v4l2_subdev subdev;
180 struct v4l2_ctrl_handler hdl;
181 struct {
182 /* exposure/autoexposure cluster */
183 struct v4l2_ctrl *autoexposure;
184 struct v4l2_ctrl *exposure;
185 };
186 struct {
187 /* gain/autogain cluster */
188 struct v4l2_ctrl *autogain;
189 struct v4l2_ctrl *gain;
190 };
191 struct {
192 /* blue/red/autowhitebalance cluster */
193 struct v4l2_ctrl *autowb;
194 struct v4l2_ctrl *blue;
195 struct v4l2_ctrl *red;
196 };
197 struct clk *clk;
198 bool half_scale; /* scale down output by 2 */
199 struct v4l2_rect rect; /* sensor cropping window */
200 struct v4l2_fract tpf; /* as requested with set_frame_interval */
201 u32 code;
202 };
203
204 struct ov6650_xclk {
205 unsigned long rate;
206 u8 clkrc;
207 };
208
209 static const struct ov6650_xclk ov6650_xclk[] = {
210 {
211 .rate = 8000000,
212 .clkrc = CLKRC_8MHz,
213 },
214 {
215 .rate = 12000000,
216 .clkrc = CLKRC_12MHz,
217 },
218 {
219 .rate = 16000000,
220 .clkrc = CLKRC_16MHz,
221 },
222 {
223 .rate = 24000000,
224 .clkrc = CLKRC_24MHz,
225 },
226 };
227
228 static u32 ov6650_codes[] = {
229 MEDIA_BUS_FMT_YUYV8_2X8,
230 MEDIA_BUS_FMT_UYVY8_2X8,
231 MEDIA_BUS_FMT_YVYU8_2X8,
232 MEDIA_BUS_FMT_VYUY8_2X8,
233 MEDIA_BUS_FMT_SBGGR8_1X8,
234 MEDIA_BUS_FMT_Y8_1X8,
235 };
236
237 static const struct v4l2_mbus_framefmt ov6650_def_fmt = {
238 .width = W_CIF,
239 .height = H_CIF,
240 .code = MEDIA_BUS_FMT_SBGGR8_1X8,
241 .colorspace = V4L2_COLORSPACE_SRGB,
242 .field = V4L2_FIELD_NONE,
243 .ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT,
244 .quantization = V4L2_QUANTIZATION_DEFAULT,
245 .xfer_func = V4L2_XFER_FUNC_DEFAULT,
246 };
247
248 /* read a register */
ov6650_reg_read(struct i2c_client * client,u8 reg,u8 * val)249 static int ov6650_reg_read(struct i2c_client *client, u8 reg, u8 *val)
250 {
251 int ret;
252 u8 data = reg;
253 struct i2c_msg msg = {
254 .addr = client->addr,
255 .flags = 0,
256 .len = 1,
257 .buf = &data,
258 };
259
260 ret = i2c_transfer(client->adapter, &msg, 1);
261 if (ret < 0)
262 goto err;
263
264 msg.flags = I2C_M_RD;
265 ret = i2c_transfer(client->adapter, &msg, 1);
266 if (ret < 0)
267 goto err;
268
269 *val = data;
270 return 0;
271
272 err:
273 dev_err(&client->dev, "Failed reading register 0x%02x!\n", reg);
274 return ret;
275 }
276
277 /* write a register */
ov6650_reg_write(struct i2c_client * client,u8 reg,u8 val)278 static int ov6650_reg_write(struct i2c_client *client, u8 reg, u8 val)
279 {
280 int ret;
281 unsigned char data[2] = { reg, val };
282 struct i2c_msg msg = {
283 .addr = client->addr,
284 .flags = 0,
285 .len = 2,
286 .buf = data,
287 };
288
289 ret = i2c_transfer(client->adapter, &msg, 1);
290 udelay(100);
291
292 if (ret < 0) {
293 dev_err(&client->dev, "Failed writing register 0x%02x!\n", reg);
294 return ret;
295 }
296 return 0;
297 }
298
299
300 /* Read a register, alter its bits, write it back */
ov6650_reg_rmw(struct i2c_client * client,u8 reg,u8 set,u8 mask)301 static int ov6650_reg_rmw(struct i2c_client *client, u8 reg, u8 set, u8 mask)
302 {
303 u8 val;
304 int ret;
305
306 ret = ov6650_reg_read(client, reg, &val);
307 if (ret) {
308 dev_err(&client->dev,
309 "[Read]-Modify-Write of register 0x%02x failed!\n",
310 reg);
311 return ret;
312 }
313
314 val &= ~mask;
315 val |= set;
316
317 ret = ov6650_reg_write(client, reg, val);
318 if (ret)
319 dev_err(&client->dev,
320 "Read-Modify-[Write] of register 0x%02x failed!\n",
321 reg);
322
323 return ret;
324 }
325
to_ov6650(const struct i2c_client * client)326 static struct ov6650 *to_ov6650(const struct i2c_client *client)
327 {
328 return container_of(i2c_get_clientdata(client), struct ov6650, subdev);
329 }
330
331 /* Start/Stop streaming from the device */
ov6650_s_stream(struct v4l2_subdev * sd,int enable)332 static int ov6650_s_stream(struct v4l2_subdev *sd, int enable)
333 {
334 return 0;
335 }
336
337 /* Get status of additional camera capabilities */
ov6550_g_volatile_ctrl(struct v4l2_ctrl * ctrl)338 static int ov6550_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
339 {
340 struct ov6650 *priv = container_of(ctrl->handler, struct ov6650, hdl);
341 struct v4l2_subdev *sd = &priv->subdev;
342 struct i2c_client *client = v4l2_get_subdevdata(sd);
343 uint8_t reg, reg2;
344 int ret;
345
346 switch (ctrl->id) {
347 case V4L2_CID_AUTOGAIN:
348 ret = ov6650_reg_read(client, REG_GAIN, ®);
349 if (!ret)
350 priv->gain->val = reg;
351 return ret;
352 case V4L2_CID_AUTO_WHITE_BALANCE:
353 ret = ov6650_reg_read(client, REG_BLUE, ®);
354 if (!ret)
355 ret = ov6650_reg_read(client, REG_RED, ®2);
356 if (!ret) {
357 priv->blue->val = reg;
358 priv->red->val = reg2;
359 }
360 return ret;
361 case V4L2_CID_EXPOSURE_AUTO:
362 ret = ov6650_reg_read(client, REG_AECH, ®);
363 if (!ret)
364 priv->exposure->val = reg;
365 return ret;
366 }
367 return -EINVAL;
368 }
369
370 /* Set status of additional camera capabilities */
ov6550_s_ctrl(struct v4l2_ctrl * ctrl)371 static int ov6550_s_ctrl(struct v4l2_ctrl *ctrl)
372 {
373 struct ov6650 *priv = container_of(ctrl->handler, struct ov6650, hdl);
374 struct v4l2_subdev *sd = &priv->subdev;
375 struct i2c_client *client = v4l2_get_subdevdata(sd);
376 int ret;
377
378 switch (ctrl->id) {
379 case V4L2_CID_AUTOGAIN:
380 ret = ov6650_reg_rmw(client, REG_COMB,
381 ctrl->val ? COMB_AGC : 0, COMB_AGC);
382 if (!ret && !ctrl->val)
383 ret = ov6650_reg_write(client, REG_GAIN, priv->gain->val);
384 return ret;
385 case V4L2_CID_AUTO_WHITE_BALANCE:
386 ret = ov6650_reg_rmw(client, REG_COMB,
387 ctrl->val ? COMB_AWB : 0, COMB_AWB);
388 if (!ret && !ctrl->val) {
389 ret = ov6650_reg_write(client, REG_BLUE, priv->blue->val);
390 if (!ret)
391 ret = ov6650_reg_write(client, REG_RED,
392 priv->red->val);
393 }
394 return ret;
395 case V4L2_CID_SATURATION:
396 return ov6650_reg_rmw(client, REG_SAT, SET_SAT(ctrl->val),
397 SAT_MASK);
398 case V4L2_CID_HUE:
399 return ov6650_reg_rmw(client, REG_HUE, SET_HUE(ctrl->val),
400 HUE_MASK);
401 case V4L2_CID_BRIGHTNESS:
402 return ov6650_reg_write(client, REG_BRT, ctrl->val);
403 case V4L2_CID_EXPOSURE_AUTO:
404 ret = ov6650_reg_rmw(client, REG_COMB, ctrl->val ==
405 V4L2_EXPOSURE_AUTO ? COMB_AEC : 0, COMB_AEC);
406 if (!ret && ctrl->val == V4L2_EXPOSURE_MANUAL)
407 ret = ov6650_reg_write(client, REG_AECH,
408 priv->exposure->val);
409 return ret;
410 case V4L2_CID_GAMMA:
411 return ov6650_reg_write(client, REG_GAM1, ctrl->val);
412 case V4L2_CID_VFLIP:
413 return ov6650_reg_rmw(client, REG_COMB,
414 ctrl->val ? COMB_FLIP_V : 0, COMB_FLIP_V);
415 case V4L2_CID_HFLIP:
416 return ov6650_reg_rmw(client, REG_COMB,
417 ctrl->val ? COMB_FLIP_H : 0, COMB_FLIP_H);
418 }
419
420 return -EINVAL;
421 }
422
423 #ifdef CONFIG_VIDEO_ADV_DEBUG
ov6650_get_register(struct v4l2_subdev * sd,struct v4l2_dbg_register * reg)424 static int ov6650_get_register(struct v4l2_subdev *sd,
425 struct v4l2_dbg_register *reg)
426 {
427 struct i2c_client *client = v4l2_get_subdevdata(sd);
428 int ret;
429 u8 val;
430
431 if (reg->reg & ~0xff)
432 return -EINVAL;
433
434 reg->size = 1;
435
436 ret = ov6650_reg_read(client, reg->reg, &val);
437 if (!ret)
438 reg->val = (__u64)val;
439
440 return ret;
441 }
442
ov6650_set_register(struct v4l2_subdev * sd,const struct v4l2_dbg_register * reg)443 static int ov6650_set_register(struct v4l2_subdev *sd,
444 const struct v4l2_dbg_register *reg)
445 {
446 struct i2c_client *client = v4l2_get_subdevdata(sd);
447
448 if (reg->reg & ~0xff || reg->val & ~0xff)
449 return -EINVAL;
450
451 return ov6650_reg_write(client, reg->reg, reg->val);
452 }
453 #endif
454
ov6650_s_power(struct v4l2_subdev * sd,int on)455 static int ov6650_s_power(struct v4l2_subdev *sd, int on)
456 {
457 struct i2c_client *client = v4l2_get_subdevdata(sd);
458 struct ov6650 *priv = to_ov6650(client);
459 int ret = 0;
460
461 if (on)
462 ret = clk_prepare_enable(priv->clk);
463 else
464 clk_disable_unprepare(priv->clk);
465
466 return ret;
467 }
468
ov6650_get_selection(struct v4l2_subdev * sd,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_selection * sel)469 static int ov6650_get_selection(struct v4l2_subdev *sd,
470 struct v4l2_subdev_state *sd_state,
471 struct v4l2_subdev_selection *sel)
472 {
473 struct i2c_client *client = v4l2_get_subdevdata(sd);
474 struct ov6650 *priv = to_ov6650(client);
475 struct v4l2_rect *rect;
476
477 if (sel->which == V4L2_SUBDEV_FORMAT_TRY) {
478 /* pre-select try crop rectangle */
479 rect = v4l2_subdev_state_get_crop(sd_state, 0);
480
481 } else {
482 /* pre-select active crop rectangle */
483 rect = &priv->rect;
484 }
485
486 switch (sel->target) {
487 case V4L2_SEL_TGT_CROP_BOUNDS:
488 sel->r.left = DEF_HSTRT << 1;
489 sel->r.top = DEF_VSTRT << 1;
490 sel->r.width = W_CIF;
491 sel->r.height = H_CIF;
492 return 0;
493
494 case V4L2_SEL_TGT_CROP:
495 /* use selected crop rectangle */
496 sel->r = *rect;
497 return 0;
498
499 default:
500 return -EINVAL;
501 }
502 }
503
is_unscaled_ok(int width,int height,struct v4l2_rect * rect)504 static bool is_unscaled_ok(int width, int height, struct v4l2_rect *rect)
505 {
506 return width > rect->width >> 1 || height > rect->height >> 1;
507 }
508
ov6650_bind_align_crop_rectangle(struct v4l2_rect * rect)509 static void ov6650_bind_align_crop_rectangle(struct v4l2_rect *rect)
510 {
511 v4l_bound_align_image(&rect->width, 2, W_CIF, 1,
512 &rect->height, 2, H_CIF, 1, 0);
513 v4l_bound_align_image(&rect->left, DEF_HSTRT << 1,
514 (DEF_HSTRT << 1) + W_CIF - (__s32)rect->width, 1,
515 &rect->top, DEF_VSTRT << 1,
516 (DEF_VSTRT << 1) + H_CIF - (__s32)rect->height,
517 1, 0);
518 }
519
ov6650_set_selection(struct v4l2_subdev * sd,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_selection * sel)520 static int ov6650_set_selection(struct v4l2_subdev *sd,
521 struct v4l2_subdev_state *sd_state,
522 struct v4l2_subdev_selection *sel)
523 {
524 struct i2c_client *client = v4l2_get_subdevdata(sd);
525 struct ov6650 *priv = to_ov6650(client);
526 int ret;
527
528 if (sel->target != V4L2_SEL_TGT_CROP)
529 return -EINVAL;
530
531 ov6650_bind_align_crop_rectangle(&sel->r);
532
533 if (sel->which == V4L2_SUBDEV_FORMAT_TRY) {
534 struct v4l2_rect *crop =
535 v4l2_subdev_state_get_crop(sd_state, 0);
536 struct v4l2_mbus_framefmt *mf =
537 v4l2_subdev_state_get_format(sd_state, 0);
538 /* detect current pad config scaling factor */
539 bool half_scale = !is_unscaled_ok(mf->width, mf->height, crop);
540
541 /* store new crop rectangle */
542 *crop = sel->r;
543
544 /* adjust frame size */
545 mf->width = crop->width >> half_scale;
546 mf->height = crop->height >> half_scale;
547
548 return 0;
549 }
550
551 /* V4L2_SUBDEV_FORMAT_ACTIVE */
552
553 /* apply new crop rectangle */
554 ret = ov6650_reg_write(client, REG_HSTRT, sel->r.left >> 1);
555 if (!ret) {
556 priv->rect.width += priv->rect.left - sel->r.left;
557 priv->rect.left = sel->r.left;
558 ret = ov6650_reg_write(client, REG_HSTOP,
559 (sel->r.left + sel->r.width) >> 1);
560 }
561 if (!ret) {
562 priv->rect.width = sel->r.width;
563 ret = ov6650_reg_write(client, REG_VSTRT, sel->r.top >> 1);
564 }
565 if (!ret) {
566 priv->rect.height += priv->rect.top - sel->r.top;
567 priv->rect.top = sel->r.top;
568 ret = ov6650_reg_write(client, REG_VSTOP,
569 (sel->r.top + sel->r.height) >> 1);
570 }
571 if (!ret)
572 priv->rect.height = sel->r.height;
573
574 return ret;
575 }
576
ov6650_get_fmt(struct v4l2_subdev * sd,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_format * format)577 static int ov6650_get_fmt(struct v4l2_subdev *sd,
578 struct v4l2_subdev_state *sd_state,
579 struct v4l2_subdev_format *format)
580 {
581 struct v4l2_mbus_framefmt *mf = &format->format;
582 struct i2c_client *client = v4l2_get_subdevdata(sd);
583 struct ov6650 *priv = to_ov6650(client);
584
585 if (format->pad)
586 return -EINVAL;
587
588 /* initialize response with default media bus frame format */
589 *mf = ov6650_def_fmt;
590
591 /* update media bus format code and frame size */
592 if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
593 struct v4l2_mbus_framefmt *try_fmt =
594 v4l2_subdev_state_get_format(sd_state, 0);
595
596 mf->width = try_fmt->width;
597 mf->height = try_fmt->height;
598 mf->code = try_fmt->code;
599
600 } else {
601 mf->width = priv->rect.width >> priv->half_scale;
602 mf->height = priv->rect.height >> priv->half_scale;
603 mf->code = priv->code;
604 }
605 return 0;
606 }
607
608 #define to_clkrc(div) ((div) - 1)
609
610 /* set the format we will capture in */
ov6650_s_fmt(struct v4l2_subdev * sd,u32 code,bool half_scale)611 static int ov6650_s_fmt(struct v4l2_subdev *sd, u32 code, bool half_scale)
612 {
613 struct i2c_client *client = v4l2_get_subdevdata(sd);
614 struct ov6650 *priv = to_ov6650(client);
615 u8 coma_set = 0, coma_mask = 0, coml_set, coml_mask;
616 int ret;
617
618 /* select color matrix configuration for given color encoding */
619 switch (code) {
620 case MEDIA_BUS_FMT_Y8_1X8:
621 dev_dbg(&client->dev, "pixel format GREY8_1X8\n");
622 coma_mask |= COMA_RGB | COMA_WORD_SWAP | COMA_BYTE_SWAP;
623 coma_set |= COMA_BW;
624 break;
625 case MEDIA_BUS_FMT_YUYV8_2X8:
626 dev_dbg(&client->dev, "pixel format YUYV8_2X8_LE\n");
627 coma_mask |= COMA_RGB | COMA_BW | COMA_BYTE_SWAP;
628 coma_set |= COMA_WORD_SWAP;
629 break;
630 case MEDIA_BUS_FMT_YVYU8_2X8:
631 dev_dbg(&client->dev, "pixel format YVYU8_2X8_LE (untested)\n");
632 coma_mask |= COMA_RGB | COMA_BW | COMA_WORD_SWAP |
633 COMA_BYTE_SWAP;
634 break;
635 case MEDIA_BUS_FMT_UYVY8_2X8:
636 dev_dbg(&client->dev, "pixel format YUYV8_2X8_BE\n");
637 if (half_scale) {
638 coma_mask |= COMA_RGB | COMA_BW | COMA_WORD_SWAP;
639 coma_set |= COMA_BYTE_SWAP;
640 } else {
641 coma_mask |= COMA_RGB | COMA_BW;
642 coma_set |= COMA_BYTE_SWAP | COMA_WORD_SWAP;
643 }
644 break;
645 case MEDIA_BUS_FMT_VYUY8_2X8:
646 dev_dbg(&client->dev, "pixel format YVYU8_2X8_BE (untested)\n");
647 if (half_scale) {
648 coma_mask |= COMA_RGB | COMA_BW;
649 coma_set |= COMA_BYTE_SWAP | COMA_WORD_SWAP;
650 } else {
651 coma_mask |= COMA_RGB | COMA_BW | COMA_WORD_SWAP;
652 coma_set |= COMA_BYTE_SWAP;
653 }
654 break;
655 case MEDIA_BUS_FMT_SBGGR8_1X8:
656 dev_dbg(&client->dev, "pixel format SBGGR8_1X8 (untested)\n");
657 coma_mask |= COMA_BW | COMA_BYTE_SWAP | COMA_WORD_SWAP;
658 coma_set |= COMA_RAW_RGB | COMA_RGB;
659 break;
660 default:
661 dev_err(&client->dev, "Pixel format not handled: 0x%x\n", code);
662 return -EINVAL;
663 }
664
665 if (code == MEDIA_BUS_FMT_Y8_1X8 ||
666 code == MEDIA_BUS_FMT_SBGGR8_1X8) {
667 coml_mask = COML_ONE_CHANNEL;
668 coml_set = 0;
669 } else {
670 coml_mask = 0;
671 coml_set = COML_ONE_CHANNEL;
672 }
673
674 if (half_scale) {
675 dev_dbg(&client->dev, "max resolution: QCIF\n");
676 coma_set |= COMA_QCIF;
677 } else {
678 dev_dbg(&client->dev, "max resolution: CIF\n");
679 coma_mask |= COMA_QCIF;
680 }
681
682 ret = ov6650_reg_rmw(client, REG_COMA, coma_set, coma_mask);
683 if (!ret) {
684 priv->half_scale = half_scale;
685
686 ret = ov6650_reg_rmw(client, REG_COML, coml_set, coml_mask);
687 }
688 if (!ret)
689 priv->code = code;
690
691 return ret;
692 }
693
ov6650_set_fmt(struct v4l2_subdev * sd,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_format * format)694 static int ov6650_set_fmt(struct v4l2_subdev *sd,
695 struct v4l2_subdev_state *sd_state,
696 struct v4l2_subdev_format *format)
697 {
698 struct v4l2_mbus_framefmt *mf = &format->format;
699 struct i2c_client *client = v4l2_get_subdevdata(sd);
700 struct ov6650 *priv = to_ov6650(client);
701 struct v4l2_rect *crop;
702 bool half_scale;
703
704 if (format->pad)
705 return -EINVAL;
706
707 switch (mf->code) {
708 case MEDIA_BUS_FMT_Y10_1X10:
709 mf->code = MEDIA_BUS_FMT_Y8_1X8;
710 fallthrough;
711 case MEDIA_BUS_FMT_Y8_1X8:
712 case MEDIA_BUS_FMT_YVYU8_2X8:
713 case MEDIA_BUS_FMT_YUYV8_2X8:
714 case MEDIA_BUS_FMT_VYUY8_2X8:
715 case MEDIA_BUS_FMT_UYVY8_2X8:
716 break;
717 default:
718 mf->code = MEDIA_BUS_FMT_SBGGR8_1X8;
719 fallthrough;
720 case MEDIA_BUS_FMT_SBGGR8_1X8:
721 break;
722 }
723
724 if (format->which == V4L2_SUBDEV_FORMAT_TRY)
725 crop = v4l2_subdev_state_get_crop(sd_state, 0);
726 else
727 crop = &priv->rect;
728
729 half_scale = !is_unscaled_ok(mf->width, mf->height, crop);
730
731 if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
732 struct v4l2_mbus_framefmt *try_fmt =
733 v4l2_subdev_state_get_format(sd_state, 0);
734
735 /* store new mbus frame format code and size in pad config */
736 try_fmt->width = crop->width >> half_scale;
737 try_fmt->height = crop->height >> half_scale;
738 try_fmt->code = mf->code;
739
740 /* return default mbus frame format updated with pad config */
741 *mf = ov6650_def_fmt;
742 mf->width = try_fmt->width;
743 mf->height = try_fmt->height;
744 mf->code = try_fmt->code;
745
746 } else {
747 int ret = 0;
748
749 /* apply new media bus frame format and scaling if changed */
750 if (mf->code != priv->code || half_scale != priv->half_scale)
751 ret = ov6650_s_fmt(sd, mf->code, half_scale);
752 if (ret)
753 return ret;
754
755 /* return default format updated with active size and code */
756 *mf = ov6650_def_fmt;
757 mf->width = priv->rect.width >> priv->half_scale;
758 mf->height = priv->rect.height >> priv->half_scale;
759 mf->code = priv->code;
760 }
761 return 0;
762 }
763
ov6650_enum_mbus_code(struct v4l2_subdev * sd,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_mbus_code_enum * code)764 static int ov6650_enum_mbus_code(struct v4l2_subdev *sd,
765 struct v4l2_subdev_state *sd_state,
766 struct v4l2_subdev_mbus_code_enum *code)
767 {
768 if (code->pad || code->index >= ARRAY_SIZE(ov6650_codes))
769 return -EINVAL;
770
771 code->code = ov6650_codes[code->index];
772 return 0;
773 }
774
ov6650_enum_frame_interval(struct v4l2_subdev * sd,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_frame_interval_enum * fie)775 static int ov6650_enum_frame_interval(struct v4l2_subdev *sd,
776 struct v4l2_subdev_state *sd_state,
777 struct v4l2_subdev_frame_interval_enum *fie)
778 {
779 int i;
780
781 /* enumerate supported frame intervals not exceeding 1 second */
782 if (fie->index > CLKRC_DIV_MASK ||
783 GET_CLKRC_DIV(fie->index) > FRAME_RATE_MAX)
784 return -EINVAL;
785
786 for (i = 0; i < ARRAY_SIZE(ov6650_codes); i++)
787 if (fie->code == ov6650_codes[i])
788 break;
789 if (i == ARRAY_SIZE(ov6650_codes))
790 return -EINVAL;
791
792 if (!fie->width || fie->width > W_CIF ||
793 !fie->height || fie->height > H_CIF)
794 return -EINVAL;
795
796 fie->interval.numerator = GET_CLKRC_DIV(fie->index);
797 fie->interval.denominator = FRAME_RATE_MAX;
798
799 return 0;
800 }
801
ov6650_get_frame_interval(struct v4l2_subdev * sd,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_frame_interval * ival)802 static int ov6650_get_frame_interval(struct v4l2_subdev *sd,
803 struct v4l2_subdev_state *sd_state,
804 struct v4l2_subdev_frame_interval *ival)
805 {
806 struct i2c_client *client = v4l2_get_subdevdata(sd);
807 struct ov6650 *priv = to_ov6650(client);
808
809 /*
810 * FIXME: Implement support for V4L2_SUBDEV_FORMAT_TRY, using the V4L2
811 * subdev active state API.
812 */
813 if (ival->which != V4L2_SUBDEV_FORMAT_ACTIVE)
814 return -EINVAL;
815
816 ival->interval = priv->tpf;
817
818 dev_dbg(&client->dev, "Frame interval: %u/%u s\n",
819 ival->interval.numerator, ival->interval.denominator);
820
821 return 0;
822 }
823
ov6650_set_frame_interval(struct v4l2_subdev * sd,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_frame_interval * ival)824 static int ov6650_set_frame_interval(struct v4l2_subdev *sd,
825 struct v4l2_subdev_state *sd_state,
826 struct v4l2_subdev_frame_interval *ival)
827 {
828 struct i2c_client *client = v4l2_get_subdevdata(sd);
829 struct ov6650 *priv = to_ov6650(client);
830 struct v4l2_fract *tpf = &ival->interval;
831 int div, ret;
832
833 /*
834 * FIXME: Implement support for V4L2_SUBDEV_FORMAT_TRY, using the V4L2
835 * subdev active state API.
836 */
837 if (ival->which != V4L2_SUBDEV_FORMAT_ACTIVE)
838 return -EINVAL;
839
840 if (tpf->numerator == 0 || tpf->denominator == 0)
841 div = 1; /* Reset to full rate */
842 else
843 div = (tpf->numerator * FRAME_RATE_MAX) / tpf->denominator;
844
845 if (div == 0)
846 div = 1;
847 else if (div > GET_CLKRC_DIV(CLKRC_DIV_MASK))
848 div = GET_CLKRC_DIV(CLKRC_DIV_MASK);
849
850 ret = ov6650_reg_rmw(client, REG_CLKRC, to_clkrc(div), CLKRC_DIV_MASK);
851 if (!ret) {
852 priv->tpf.numerator = div;
853 priv->tpf.denominator = FRAME_RATE_MAX;
854
855 *tpf = priv->tpf;
856 }
857
858 return ret;
859 }
860
861 /* Soft reset the camera. This has nothing to do with the RESET pin! */
ov6650_reset(struct i2c_client * client)862 static int ov6650_reset(struct i2c_client *client)
863 {
864 int ret;
865
866 dev_dbg(&client->dev, "reset\n");
867
868 ret = ov6650_reg_rmw(client, REG_COMA, COMA_RESET, 0);
869 if (ret)
870 dev_err(&client->dev,
871 "An error occurred while entering soft reset!\n");
872
873 return ret;
874 }
875
876 /* program default register values */
ov6650_prog_dflt(struct i2c_client * client,u8 clkrc)877 static int ov6650_prog_dflt(struct i2c_client *client, u8 clkrc)
878 {
879 int ret;
880
881 dev_dbg(&client->dev, "initializing\n");
882
883 ret = ov6650_reg_write(client, REG_COMA, 0); /* ~COMA_RESET */
884 if (!ret)
885 ret = ov6650_reg_write(client, REG_CLKRC, clkrc);
886 if (!ret)
887 ret = ov6650_reg_rmw(client, REG_COMB, 0, COMB_BAND_FILTER);
888
889 return ret;
890 }
891
ov6650_video_probe(struct v4l2_subdev * sd)892 static int ov6650_video_probe(struct v4l2_subdev *sd)
893 {
894 struct i2c_client *client = v4l2_get_subdevdata(sd);
895 struct ov6650 *priv = to_ov6650(client);
896 const struct ov6650_xclk *xclk = NULL;
897 unsigned long rate;
898 u8 pidh, pidl, midh, midl;
899 int i, ret = 0;
900
901 priv->clk = devm_clk_get(&client->dev, NULL);
902 if (IS_ERR(priv->clk)) {
903 ret = PTR_ERR(priv->clk);
904 dev_err(&client->dev, "clk request err: %d\n", ret);
905 return ret;
906 }
907
908 rate = clk_get_rate(priv->clk);
909 for (i = 0; rate && i < ARRAY_SIZE(ov6650_xclk); i++) {
910 if (rate != ov6650_xclk[i].rate)
911 continue;
912
913 xclk = &ov6650_xclk[i];
914 dev_info(&client->dev, "using host default clock rate %lukHz\n",
915 rate / 1000);
916 break;
917 }
918 for (i = 0; !xclk && i < ARRAY_SIZE(ov6650_xclk); i++) {
919 ret = clk_set_rate(priv->clk, ov6650_xclk[i].rate);
920 if (ret || clk_get_rate(priv->clk) != ov6650_xclk[i].rate)
921 continue;
922
923 xclk = &ov6650_xclk[i];
924 dev_info(&client->dev, "using negotiated clock rate %lukHz\n",
925 xclk->rate / 1000);
926 break;
927 }
928 if (!xclk) {
929 dev_err(&client->dev, "unable to get supported clock rate\n");
930 if (!ret)
931 ret = -EINVAL;
932 return ret;
933 }
934
935 ret = ov6650_s_power(sd, 1);
936 if (ret < 0)
937 return ret;
938
939 msleep(20);
940
941 /*
942 * check and show product ID and manufacturer ID
943 */
944 ret = ov6650_reg_read(client, REG_PIDH, &pidh);
945 if (!ret)
946 ret = ov6650_reg_read(client, REG_PIDL, &pidl);
947 if (!ret)
948 ret = ov6650_reg_read(client, REG_MIDH, &midh);
949 if (!ret)
950 ret = ov6650_reg_read(client, REG_MIDL, &midl);
951
952 if (ret)
953 goto done;
954
955 if ((pidh != OV6650_PIDH) || (pidl != OV6650_PIDL)) {
956 dev_err(&client->dev, "Product ID error 0x%02x:0x%02x\n",
957 pidh, pidl);
958 ret = -ENODEV;
959 goto done;
960 }
961
962 dev_info(&client->dev,
963 "ov6650 Product ID 0x%02x:0x%02x Manufacturer ID 0x%02x:0x%02x\n",
964 pidh, pidl, midh, midl);
965
966 ret = ov6650_reset(client);
967 if (!ret)
968 ret = ov6650_prog_dflt(client, xclk->clkrc);
969 if (!ret) {
970 /* driver default frame format, no scaling */
971 ret = ov6650_s_fmt(sd, ov6650_def_fmt.code, false);
972 }
973 if (!ret)
974 ret = v4l2_ctrl_handler_setup(&priv->hdl);
975
976 done:
977 ov6650_s_power(sd, 0);
978 return ret;
979 }
980
981 static const struct v4l2_ctrl_ops ov6550_ctrl_ops = {
982 .g_volatile_ctrl = ov6550_g_volatile_ctrl,
983 .s_ctrl = ov6550_s_ctrl,
984 };
985
986 static const struct v4l2_subdev_core_ops ov6650_core_ops = {
987 #ifdef CONFIG_VIDEO_ADV_DEBUG
988 .g_register = ov6650_get_register,
989 .s_register = ov6650_set_register,
990 #endif
991 .s_power = ov6650_s_power,
992 };
993
994 /* Request bus settings on camera side */
ov6650_get_mbus_config(struct v4l2_subdev * sd,unsigned int pad,struct v4l2_mbus_config * cfg)995 static int ov6650_get_mbus_config(struct v4l2_subdev *sd,
996 unsigned int pad,
997 struct v4l2_mbus_config *cfg)
998 {
999 struct i2c_client *client = v4l2_get_subdevdata(sd);
1000 u8 comj, comf;
1001 int ret;
1002
1003 ret = ov6650_reg_read(client, REG_COMJ, &comj);
1004 if (ret)
1005 return ret;
1006
1007 ret = ov6650_reg_read(client, REG_COMF, &comf);
1008 if (ret)
1009 return ret;
1010
1011 cfg->type = V4L2_MBUS_PARALLEL;
1012
1013 cfg->bus.parallel.flags = V4L2_MBUS_MASTER | V4L2_MBUS_DATA_ACTIVE_HIGH
1014 | ((comj & COMJ_VSYNC_HIGH) ? V4L2_MBUS_VSYNC_ACTIVE_HIGH
1015 : V4L2_MBUS_VSYNC_ACTIVE_LOW)
1016 | ((comf & COMF_HREF_LOW) ? V4L2_MBUS_HSYNC_ACTIVE_LOW
1017 : V4L2_MBUS_HSYNC_ACTIVE_HIGH)
1018 | ((comj & COMJ_PCLK_RISING) ? V4L2_MBUS_PCLK_SAMPLE_RISING
1019 : V4L2_MBUS_PCLK_SAMPLE_FALLING);
1020 return 0;
1021 }
1022
1023 static const struct v4l2_subdev_video_ops ov6650_video_ops = {
1024 .s_stream = ov6650_s_stream,
1025 };
1026
1027 static const struct v4l2_subdev_pad_ops ov6650_pad_ops = {
1028 .enum_mbus_code = ov6650_enum_mbus_code,
1029 .enum_frame_interval = ov6650_enum_frame_interval,
1030 .get_selection = ov6650_get_selection,
1031 .set_selection = ov6650_set_selection,
1032 .get_fmt = ov6650_get_fmt,
1033 .set_fmt = ov6650_set_fmt,
1034 .get_frame_interval = ov6650_get_frame_interval,
1035 .set_frame_interval = ov6650_set_frame_interval,
1036 .get_mbus_config = ov6650_get_mbus_config,
1037 };
1038
1039 static const struct v4l2_subdev_ops ov6650_subdev_ops = {
1040 .core = &ov6650_core_ops,
1041 .video = &ov6650_video_ops,
1042 .pad = &ov6650_pad_ops,
1043 };
1044
1045 static const struct v4l2_subdev_internal_ops ov6650_internal_ops = {
1046 .registered = ov6650_video_probe,
1047 };
1048
1049 /*
1050 * i2c_driver function
1051 */
ov6650_probe(struct i2c_client * client)1052 static int ov6650_probe(struct i2c_client *client)
1053 {
1054 struct ov6650 *priv;
1055 int ret;
1056
1057 priv = devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL);
1058 if (!priv)
1059 return -ENOMEM;
1060
1061 v4l2_i2c_subdev_init(&priv->subdev, client, &ov6650_subdev_ops);
1062 v4l2_ctrl_handler_init(&priv->hdl, 13);
1063 v4l2_ctrl_new_std(&priv->hdl, &ov6550_ctrl_ops,
1064 V4L2_CID_VFLIP, 0, 1, 1, 0);
1065 v4l2_ctrl_new_std(&priv->hdl, &ov6550_ctrl_ops,
1066 V4L2_CID_HFLIP, 0, 1, 1, 0);
1067 priv->autogain = v4l2_ctrl_new_std(&priv->hdl, &ov6550_ctrl_ops,
1068 V4L2_CID_AUTOGAIN, 0, 1, 1, 1);
1069 priv->gain = v4l2_ctrl_new_std(&priv->hdl, &ov6550_ctrl_ops,
1070 V4L2_CID_GAIN, 0, 0x3f, 1, DEF_GAIN);
1071 priv->autowb = v4l2_ctrl_new_std(&priv->hdl, &ov6550_ctrl_ops,
1072 V4L2_CID_AUTO_WHITE_BALANCE, 0, 1, 1, 1);
1073 priv->blue = v4l2_ctrl_new_std(&priv->hdl, &ov6550_ctrl_ops,
1074 V4L2_CID_BLUE_BALANCE, 0, 0xff, 1, DEF_BLUE);
1075 priv->red = v4l2_ctrl_new_std(&priv->hdl, &ov6550_ctrl_ops,
1076 V4L2_CID_RED_BALANCE, 0, 0xff, 1, DEF_RED);
1077 v4l2_ctrl_new_std(&priv->hdl, &ov6550_ctrl_ops,
1078 V4L2_CID_SATURATION, 0, 0xf, 1, 0x8);
1079 v4l2_ctrl_new_std(&priv->hdl, &ov6550_ctrl_ops,
1080 V4L2_CID_HUE, 0, HUE_MASK, 1, DEF_HUE);
1081 v4l2_ctrl_new_std(&priv->hdl, &ov6550_ctrl_ops,
1082 V4L2_CID_BRIGHTNESS, 0, 0xff, 1, 0x80);
1083 priv->autoexposure = v4l2_ctrl_new_std_menu(&priv->hdl,
1084 &ov6550_ctrl_ops, V4L2_CID_EXPOSURE_AUTO,
1085 V4L2_EXPOSURE_MANUAL, 0, V4L2_EXPOSURE_AUTO);
1086 priv->exposure = v4l2_ctrl_new_std(&priv->hdl, &ov6550_ctrl_ops,
1087 V4L2_CID_EXPOSURE, 0, 0xff, 1, DEF_AECH);
1088 v4l2_ctrl_new_std(&priv->hdl, &ov6550_ctrl_ops,
1089 V4L2_CID_GAMMA, 0, 0xff, 1, 0x12);
1090
1091 priv->subdev.ctrl_handler = &priv->hdl;
1092 if (priv->hdl.error) {
1093 ret = priv->hdl.error;
1094 goto ectlhdlfree;
1095 }
1096
1097 v4l2_ctrl_auto_cluster(2, &priv->autogain, 0, true);
1098 v4l2_ctrl_auto_cluster(3, &priv->autowb, 0, true);
1099 v4l2_ctrl_auto_cluster(2, &priv->autoexposure,
1100 V4L2_EXPOSURE_MANUAL, true);
1101
1102 priv->rect.left = DEF_HSTRT << 1;
1103 priv->rect.top = DEF_VSTRT << 1;
1104 priv->rect.width = W_CIF;
1105 priv->rect.height = H_CIF;
1106
1107 /* Hardware default frame interval */
1108 priv->tpf.numerator = GET_CLKRC_DIV(DEF_CLKRC);
1109 priv->tpf.denominator = FRAME_RATE_MAX;
1110
1111 priv->subdev.internal_ops = &ov6650_internal_ops;
1112
1113 ret = v4l2_async_register_subdev(&priv->subdev);
1114 if (!ret)
1115 return 0;
1116 ectlhdlfree:
1117 v4l2_ctrl_handler_free(&priv->hdl);
1118
1119 return ret;
1120 }
1121
ov6650_remove(struct i2c_client * client)1122 static void ov6650_remove(struct i2c_client *client)
1123 {
1124 struct ov6650 *priv = to_ov6650(client);
1125
1126 v4l2_async_unregister_subdev(&priv->subdev);
1127 v4l2_ctrl_handler_free(&priv->hdl);
1128 }
1129
1130 static const struct i2c_device_id ov6650_id[] = {
1131 { "ov6650" },
1132 { }
1133 };
1134 MODULE_DEVICE_TABLE(i2c, ov6650_id);
1135
1136 static struct i2c_driver ov6650_i2c_driver = {
1137 .driver = {
1138 .name = "ov6650",
1139 },
1140 .probe = ov6650_probe,
1141 .remove = ov6650_remove,
1142 .id_table = ov6650_id,
1143 };
1144
1145 module_i2c_driver(ov6650_i2c_driver);
1146
1147 MODULE_DESCRIPTION("V4L2 subdevice driver for OmniVision OV6650 camera sensor");
1148 MODULE_AUTHOR("Janusz Krzysztofik <jmkrzyszt@gmail.com");
1149 MODULE_LICENSE("GPL v2");
1150