1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Omnivision OV2680 CMOS Image Sensor driver
4 *
5 * Copyright (C) 2018 Linaro Ltd
6 *
7 * Based on OV5640 Sensor Driver
8 * Copyright (C) 2011-2013 Freescale Semiconductor, Inc. All Rights Reserved.
9 * Copyright (C) 2014-2017 Mentor Graphics Inc.
10 *
11 */
12
13 #include <asm/unaligned.h>
14 #include <linux/clk.h>
15 #include <linux/delay.h>
16 #include <linux/err.h>
17 #include <linux/i2c.h>
18 #include <linux/init.h>
19 #include <linux/module.h>
20 #include <linux/of_device.h>
21 #include <linux/gpio/consumer.h>
22 #include <linux/regulator/consumer.h>
23
24 #include <media/v4l2-common.h>
25 #include <media/v4l2-ctrls.h>
26 #include <media/v4l2-subdev.h>
27
28 #define OV2680_XVCLK_VALUE 24000000
29
30 #define OV2680_CHIP_ID 0x2680
31
32 #define OV2680_REG_STREAM_CTRL 0x0100
33 #define OV2680_REG_SOFT_RESET 0x0103
34
35 #define OV2680_REG_CHIP_ID_HIGH 0x300a
36 #define OV2680_REG_CHIP_ID_LOW 0x300b
37
38 #define OV2680_REG_R_MANUAL 0x3503
39 #define OV2680_REG_GAIN_PK 0x350a
40 #define OV2680_REG_EXPOSURE_PK_HIGH 0x3500
41 #define OV2680_REG_TIMING_HTS 0x380c
42 #define OV2680_REG_TIMING_VTS 0x380e
43 #define OV2680_REG_FORMAT1 0x3820
44 #define OV2680_REG_FORMAT2 0x3821
45
46 #define OV2680_REG_ISP_CTRL00 0x5080
47
48 #define OV2680_FRAME_RATE 30
49
50 #define OV2680_REG_VALUE_8BIT 1
51 #define OV2680_REG_VALUE_16BIT 2
52 #define OV2680_REG_VALUE_24BIT 3
53
54 #define OV2680_WIDTH_MAX 1600
55 #define OV2680_HEIGHT_MAX 1200
56
57 enum ov2680_mode_id {
58 OV2680_MODE_QUXGA_800_600,
59 OV2680_MODE_720P_1280_720,
60 OV2680_MODE_UXGA_1600_1200,
61 OV2680_MODE_MAX,
62 };
63
64 struct reg_value {
65 u16 reg_addr;
66 u8 val;
67 };
68
69 static const char * const ov2680_supply_name[] = {
70 "DOVDD",
71 "DVDD",
72 "AVDD",
73 };
74
75 #define OV2680_NUM_SUPPLIES ARRAY_SIZE(ov2680_supply_name)
76
77 struct ov2680_mode_info {
78 const char *name;
79 enum ov2680_mode_id id;
80 u32 width;
81 u32 height;
82 const struct reg_value *reg_data;
83 u32 reg_data_size;
84 };
85
86 struct ov2680_ctrls {
87 struct v4l2_ctrl_handler handler;
88 struct {
89 struct v4l2_ctrl *auto_exp;
90 struct v4l2_ctrl *exposure;
91 };
92 struct {
93 struct v4l2_ctrl *auto_gain;
94 struct v4l2_ctrl *gain;
95 };
96
97 struct v4l2_ctrl *hflip;
98 struct v4l2_ctrl *vflip;
99 struct v4l2_ctrl *test_pattern;
100 };
101
102 struct ov2680_dev {
103 struct i2c_client *i2c_client;
104 struct v4l2_subdev sd;
105
106 struct media_pad pad;
107 struct clk *xvclk;
108 u32 xvclk_freq;
109 struct regulator_bulk_data supplies[OV2680_NUM_SUPPLIES];
110
111 struct gpio_desc *reset_gpio;
112 struct mutex lock; /* protect members */
113
114 bool mode_pending_changes;
115 bool is_enabled;
116 bool is_streaming;
117
118 struct ov2680_ctrls ctrls;
119 struct v4l2_mbus_framefmt fmt;
120 struct v4l2_fract frame_interval;
121
122 const struct ov2680_mode_info *current_mode;
123 };
124
125 static const char * const test_pattern_menu[] = {
126 "Disabled",
127 "Color Bars",
128 "Random Data",
129 "Square",
130 "Black Image",
131 };
132
133 static const int ov2680_hv_flip_bayer_order[] = {
134 MEDIA_BUS_FMT_SBGGR10_1X10,
135 MEDIA_BUS_FMT_SGRBG10_1X10,
136 MEDIA_BUS_FMT_SGBRG10_1X10,
137 MEDIA_BUS_FMT_SRGGB10_1X10,
138 };
139
140 static const struct reg_value ov2680_setting_30fps_QUXGA_800_600[] = {
141 {0x3086, 0x01}, {0x370a, 0x23}, {0x3808, 0x03}, {0x3809, 0x20},
142 {0x380a, 0x02}, {0x380b, 0x58}, {0x380c, 0x06}, {0x380d, 0xac},
143 {0x380e, 0x02}, {0x380f, 0x84}, {0x3811, 0x04}, {0x3813, 0x04},
144 {0x3814, 0x31}, {0x3815, 0x31}, {0x3820, 0xc0}, {0x4008, 0x00},
145 {0x4009, 0x03}, {0x4837, 0x1e}, {0x3501, 0x4e}, {0x3502, 0xe0},
146 };
147
148 static const struct reg_value ov2680_setting_30fps_720P_1280_720[] = {
149 {0x3086, 0x00}, {0x3808, 0x05}, {0x3809, 0x00}, {0x380a, 0x02},
150 {0x380b, 0xd0}, {0x380c, 0x06}, {0x380d, 0xa8}, {0x380e, 0x05},
151 {0x380f, 0x0e}, {0x3811, 0x08}, {0x3813, 0x06}, {0x3814, 0x11},
152 {0x3815, 0x11}, {0x3820, 0xc0}, {0x4008, 0x00},
153 };
154
155 static const struct reg_value ov2680_setting_30fps_UXGA_1600_1200[] = {
156 {0x3086, 0x00}, {0x3501, 0x4e}, {0x3502, 0xe0}, {0x3808, 0x06},
157 {0x3809, 0x40}, {0x380a, 0x04}, {0x380b, 0xb0}, {0x380c, 0x06},
158 {0x380d, 0xa8}, {0x380e, 0x05}, {0x380f, 0x0e}, {0x3811, 0x00},
159 {0x3813, 0x00}, {0x3814, 0x11}, {0x3815, 0x11}, {0x3820, 0xc0},
160 {0x4008, 0x00}, {0x4837, 0x18}
161 };
162
163 static const struct ov2680_mode_info ov2680_mode_init_data = {
164 "mode_quxga_800_600", OV2680_MODE_QUXGA_800_600, 800, 600,
165 ov2680_setting_30fps_QUXGA_800_600,
166 ARRAY_SIZE(ov2680_setting_30fps_QUXGA_800_600),
167 };
168
169 static const struct ov2680_mode_info ov2680_mode_data[OV2680_MODE_MAX] = {
170 {"mode_quxga_800_600", OV2680_MODE_QUXGA_800_600,
171 800, 600, ov2680_setting_30fps_QUXGA_800_600,
172 ARRAY_SIZE(ov2680_setting_30fps_QUXGA_800_600)},
173 {"mode_720p_1280_720", OV2680_MODE_720P_1280_720,
174 1280, 720, ov2680_setting_30fps_720P_1280_720,
175 ARRAY_SIZE(ov2680_setting_30fps_720P_1280_720)},
176 {"mode_uxga_1600_1200", OV2680_MODE_UXGA_1600_1200,
177 1600, 1200, ov2680_setting_30fps_UXGA_1600_1200,
178 ARRAY_SIZE(ov2680_setting_30fps_UXGA_1600_1200)},
179 };
180
to_ov2680_dev(struct v4l2_subdev * sd)181 static struct ov2680_dev *to_ov2680_dev(struct v4l2_subdev *sd)
182 {
183 return container_of(sd, struct ov2680_dev, sd);
184 }
185
ov2680_to_dev(struct ov2680_dev * sensor)186 static struct device *ov2680_to_dev(struct ov2680_dev *sensor)
187 {
188 return &sensor->i2c_client->dev;
189 }
190
ctrl_to_sd(struct v4l2_ctrl * ctrl)191 static inline struct v4l2_subdev *ctrl_to_sd(struct v4l2_ctrl *ctrl)
192 {
193 return &container_of(ctrl->handler, struct ov2680_dev,
194 ctrls.handler)->sd;
195 }
196
__ov2680_write_reg(struct ov2680_dev * sensor,u16 reg,unsigned int len,u32 val)197 static int __ov2680_write_reg(struct ov2680_dev *sensor, u16 reg,
198 unsigned int len, u32 val)
199 {
200 struct i2c_client *client = sensor->i2c_client;
201 u8 buf[6];
202 int ret;
203
204 if (len > 4)
205 return -EINVAL;
206
207 put_unaligned_be16(reg, buf);
208 put_unaligned_be32(val << (8 * (4 - len)), buf + 2);
209 ret = i2c_master_send(client, buf, len + 2);
210 if (ret != len + 2) {
211 dev_err(&client->dev, "write error: reg=0x%4x: %d\n", reg, ret);
212 return -EIO;
213 }
214
215 return 0;
216 }
217
218 #define ov2680_write_reg(s, r, v) \
219 __ov2680_write_reg(s, r, OV2680_REG_VALUE_8BIT, v)
220
221 #define ov2680_write_reg16(s, r, v) \
222 __ov2680_write_reg(s, r, OV2680_REG_VALUE_16BIT, v)
223
224 #define ov2680_write_reg24(s, r, v) \
225 __ov2680_write_reg(s, r, OV2680_REG_VALUE_24BIT, v)
226
__ov2680_read_reg(struct ov2680_dev * sensor,u16 reg,unsigned int len,u32 * val)227 static int __ov2680_read_reg(struct ov2680_dev *sensor, u16 reg,
228 unsigned int len, u32 *val)
229 {
230 struct i2c_client *client = sensor->i2c_client;
231 struct i2c_msg msgs[2];
232 u8 addr_buf[2] = { reg >> 8, reg & 0xff };
233 u8 data_buf[4] = { 0, };
234 int ret;
235
236 if (len > 4)
237 return -EINVAL;
238
239 msgs[0].addr = client->addr;
240 msgs[0].flags = 0;
241 msgs[0].len = ARRAY_SIZE(addr_buf);
242 msgs[0].buf = addr_buf;
243
244 msgs[1].addr = client->addr;
245 msgs[1].flags = I2C_M_RD;
246 msgs[1].len = len;
247 msgs[1].buf = &data_buf[4 - len];
248
249 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
250 if (ret != ARRAY_SIZE(msgs)) {
251 dev_err(&client->dev, "read error: reg=0x%4x: %d\n", reg, ret);
252 return -EIO;
253 }
254
255 *val = get_unaligned_be32(data_buf);
256
257 return 0;
258 }
259
260 #define ov2680_read_reg(s, r, v) \
261 __ov2680_read_reg(s, r, OV2680_REG_VALUE_8BIT, v)
262
263 #define ov2680_read_reg16(s, r, v) \
264 __ov2680_read_reg(s, r, OV2680_REG_VALUE_16BIT, v)
265
266 #define ov2680_read_reg24(s, r, v) \
267 __ov2680_read_reg(s, r, OV2680_REG_VALUE_24BIT, v)
268
ov2680_mod_reg(struct ov2680_dev * sensor,u16 reg,u8 mask,u8 val)269 static int ov2680_mod_reg(struct ov2680_dev *sensor, u16 reg, u8 mask, u8 val)
270 {
271 u32 readval;
272 int ret;
273
274 ret = ov2680_read_reg(sensor, reg, &readval);
275 if (ret < 0)
276 return ret;
277
278 readval &= ~mask;
279 val &= mask;
280 val |= readval;
281
282 return ov2680_write_reg(sensor, reg, val);
283 }
284
ov2680_load_regs(struct ov2680_dev * sensor,const struct ov2680_mode_info * mode)285 static int ov2680_load_regs(struct ov2680_dev *sensor,
286 const struct ov2680_mode_info *mode)
287 {
288 const struct reg_value *regs = mode->reg_data;
289 unsigned int i;
290 int ret = 0;
291 u16 reg_addr;
292 u8 val;
293
294 for (i = 0; i < mode->reg_data_size; ++i, ++regs) {
295 reg_addr = regs->reg_addr;
296 val = regs->val;
297
298 ret = ov2680_write_reg(sensor, reg_addr, val);
299 if (ret)
300 break;
301 }
302
303 return ret;
304 }
305
ov2680_power_up(struct ov2680_dev * sensor)306 static void ov2680_power_up(struct ov2680_dev *sensor)
307 {
308 if (!sensor->reset_gpio)
309 return;
310
311 gpiod_set_value(sensor->reset_gpio, 0);
312 usleep_range(5000, 10000);
313 }
314
ov2680_power_down(struct ov2680_dev * sensor)315 static void ov2680_power_down(struct ov2680_dev *sensor)
316 {
317 if (!sensor->reset_gpio)
318 return;
319
320 gpiod_set_value(sensor->reset_gpio, 1);
321 usleep_range(5000, 10000);
322 }
323
ov2680_bayer_order(struct ov2680_dev * sensor)324 static int ov2680_bayer_order(struct ov2680_dev *sensor)
325 {
326 u32 format1;
327 u32 format2;
328 u32 hv_flip;
329 int ret;
330
331 ret = ov2680_read_reg(sensor, OV2680_REG_FORMAT1, &format1);
332 if (ret < 0)
333 return ret;
334
335 ret = ov2680_read_reg(sensor, OV2680_REG_FORMAT2, &format2);
336 if (ret < 0)
337 return ret;
338
339 hv_flip = (format2 & BIT(2) << 1) | (format1 & BIT(2));
340
341 sensor->fmt.code = ov2680_hv_flip_bayer_order[hv_flip];
342
343 return 0;
344 }
345
ov2680_vflip_enable(struct ov2680_dev * sensor)346 static int ov2680_vflip_enable(struct ov2680_dev *sensor)
347 {
348 int ret;
349
350 ret = ov2680_mod_reg(sensor, OV2680_REG_FORMAT1, BIT(2), BIT(2));
351 if (ret < 0)
352 return ret;
353
354 return ov2680_bayer_order(sensor);
355 }
356
ov2680_vflip_disable(struct ov2680_dev * sensor)357 static int ov2680_vflip_disable(struct ov2680_dev *sensor)
358 {
359 int ret;
360
361 ret = ov2680_mod_reg(sensor, OV2680_REG_FORMAT1, BIT(2), BIT(0));
362 if (ret < 0)
363 return ret;
364
365 return ov2680_bayer_order(sensor);
366 }
367
ov2680_hflip_enable(struct ov2680_dev * sensor)368 static int ov2680_hflip_enable(struct ov2680_dev *sensor)
369 {
370 int ret;
371
372 ret = ov2680_mod_reg(sensor, OV2680_REG_FORMAT2, BIT(2), BIT(2));
373 if (ret < 0)
374 return ret;
375
376 return ov2680_bayer_order(sensor);
377 }
378
ov2680_hflip_disable(struct ov2680_dev * sensor)379 static int ov2680_hflip_disable(struct ov2680_dev *sensor)
380 {
381 int ret;
382
383 ret = ov2680_mod_reg(sensor, OV2680_REG_FORMAT2, BIT(2), BIT(0));
384 if (ret < 0)
385 return ret;
386
387 return ov2680_bayer_order(sensor);
388 }
389
ov2680_test_pattern_set(struct ov2680_dev * sensor,int value)390 static int ov2680_test_pattern_set(struct ov2680_dev *sensor, int value)
391 {
392 int ret;
393
394 if (!value)
395 return ov2680_mod_reg(sensor, OV2680_REG_ISP_CTRL00, BIT(7), 0);
396
397 ret = ov2680_mod_reg(sensor, OV2680_REG_ISP_CTRL00, 0x03, value - 1);
398 if (ret < 0)
399 return ret;
400
401 ret = ov2680_mod_reg(sensor, OV2680_REG_ISP_CTRL00, BIT(7), BIT(7));
402 if (ret < 0)
403 return ret;
404
405 return 0;
406 }
407
ov2680_gain_set(struct ov2680_dev * sensor,bool auto_gain)408 static int ov2680_gain_set(struct ov2680_dev *sensor, bool auto_gain)
409 {
410 struct ov2680_ctrls *ctrls = &sensor->ctrls;
411 u32 gain;
412 int ret;
413
414 ret = ov2680_mod_reg(sensor, OV2680_REG_R_MANUAL, BIT(1),
415 auto_gain ? 0 : BIT(1));
416 if (ret < 0)
417 return ret;
418
419 if (auto_gain || !ctrls->gain->is_new)
420 return 0;
421
422 gain = ctrls->gain->val;
423
424 ret = ov2680_write_reg16(sensor, OV2680_REG_GAIN_PK, gain);
425
426 return 0;
427 }
428
ov2680_gain_get(struct ov2680_dev * sensor)429 static int ov2680_gain_get(struct ov2680_dev *sensor)
430 {
431 u32 gain;
432 int ret;
433
434 ret = ov2680_read_reg16(sensor, OV2680_REG_GAIN_PK, &gain);
435 if (ret)
436 return ret;
437
438 return gain;
439 }
440
ov2680_exposure_set(struct ov2680_dev * sensor,bool auto_exp)441 static int ov2680_exposure_set(struct ov2680_dev *sensor, bool auto_exp)
442 {
443 struct ov2680_ctrls *ctrls = &sensor->ctrls;
444 u32 exp;
445 int ret;
446
447 ret = ov2680_mod_reg(sensor, OV2680_REG_R_MANUAL, BIT(0),
448 auto_exp ? 0 : BIT(0));
449 if (ret < 0)
450 return ret;
451
452 if (auto_exp || !ctrls->exposure->is_new)
453 return 0;
454
455 exp = (u32)ctrls->exposure->val;
456 exp <<= 4;
457
458 return ov2680_write_reg24(sensor, OV2680_REG_EXPOSURE_PK_HIGH, exp);
459 }
460
ov2680_exposure_get(struct ov2680_dev * sensor)461 static int ov2680_exposure_get(struct ov2680_dev *sensor)
462 {
463 int ret;
464 u32 exp;
465
466 ret = ov2680_read_reg24(sensor, OV2680_REG_EXPOSURE_PK_HIGH, &exp);
467 if (ret)
468 return ret;
469
470 return exp >> 4;
471 }
472
ov2680_stream_enable(struct ov2680_dev * sensor)473 static int ov2680_stream_enable(struct ov2680_dev *sensor)
474 {
475 return ov2680_write_reg(sensor, OV2680_REG_STREAM_CTRL, 1);
476 }
477
ov2680_stream_disable(struct ov2680_dev * sensor)478 static int ov2680_stream_disable(struct ov2680_dev *sensor)
479 {
480 return ov2680_write_reg(sensor, OV2680_REG_STREAM_CTRL, 0);
481 }
482
ov2680_mode_set(struct ov2680_dev * sensor)483 static int ov2680_mode_set(struct ov2680_dev *sensor)
484 {
485 struct ov2680_ctrls *ctrls = &sensor->ctrls;
486 int ret;
487
488 ret = ov2680_gain_set(sensor, false);
489 if (ret < 0)
490 return ret;
491
492 ret = ov2680_exposure_set(sensor, false);
493 if (ret < 0)
494 return ret;
495
496 ret = ov2680_load_regs(sensor, sensor->current_mode);
497 if (ret < 0)
498 return ret;
499
500 if (ctrls->auto_gain->val) {
501 ret = ov2680_gain_set(sensor, true);
502 if (ret < 0)
503 return ret;
504 }
505
506 if (ctrls->auto_exp->val == V4L2_EXPOSURE_AUTO) {
507 ret = ov2680_exposure_set(sensor, true);
508 if (ret < 0)
509 return ret;
510 }
511
512 sensor->mode_pending_changes = false;
513
514 return 0;
515 }
516
ov2680_mode_restore(struct ov2680_dev * sensor)517 static int ov2680_mode_restore(struct ov2680_dev *sensor)
518 {
519 int ret;
520
521 ret = ov2680_load_regs(sensor, &ov2680_mode_init_data);
522 if (ret < 0)
523 return ret;
524
525 return ov2680_mode_set(sensor);
526 }
527
ov2680_power_off(struct ov2680_dev * sensor)528 static int ov2680_power_off(struct ov2680_dev *sensor)
529 {
530 if (!sensor->is_enabled)
531 return 0;
532
533 clk_disable_unprepare(sensor->xvclk);
534 ov2680_power_down(sensor);
535 regulator_bulk_disable(OV2680_NUM_SUPPLIES, sensor->supplies);
536 sensor->is_enabled = false;
537
538 return 0;
539 }
540
ov2680_power_on(struct ov2680_dev * sensor)541 static int ov2680_power_on(struct ov2680_dev *sensor)
542 {
543 struct device *dev = ov2680_to_dev(sensor);
544 int ret;
545
546 if (sensor->is_enabled)
547 return 0;
548
549 ret = regulator_bulk_enable(OV2680_NUM_SUPPLIES, sensor->supplies);
550 if (ret < 0) {
551 dev_err(dev, "failed to enable regulators: %d\n", ret);
552 return ret;
553 }
554
555 if (!sensor->reset_gpio) {
556 ret = ov2680_write_reg(sensor, OV2680_REG_SOFT_RESET, 0x01);
557 if (ret != 0) {
558 dev_err(dev, "sensor soft reset failed\n");
559 return ret;
560 }
561 usleep_range(1000, 2000);
562 } else {
563 ov2680_power_down(sensor);
564 ov2680_power_up(sensor);
565 }
566
567 ret = clk_prepare_enable(sensor->xvclk);
568 if (ret < 0)
569 return ret;
570
571 ret = ov2680_mode_restore(sensor);
572 if (ret < 0)
573 goto disable;
574
575 sensor->is_enabled = true;
576
577 /* Set clock lane into LP-11 state */
578 ov2680_stream_enable(sensor);
579 usleep_range(1000, 2000);
580 ov2680_stream_disable(sensor);
581
582 return 0;
583
584 disable:
585 dev_err(dev, "failed to enable sensor: %d\n", ret);
586 ov2680_power_off(sensor);
587
588 return ret;
589 }
590
ov2680_s_power(struct v4l2_subdev * sd,int on)591 static int ov2680_s_power(struct v4l2_subdev *sd, int on)
592 {
593 struct ov2680_dev *sensor = to_ov2680_dev(sd);
594 int ret = 0;
595
596 mutex_lock(&sensor->lock);
597
598 if (on)
599 ret = ov2680_power_on(sensor);
600 else
601 ret = ov2680_power_off(sensor);
602
603 mutex_unlock(&sensor->lock);
604
605 if (on && ret == 0) {
606 ret = v4l2_ctrl_handler_setup(&sensor->ctrls.handler);
607 if (ret < 0)
608 return ret;
609 }
610
611 return ret;
612 }
613
ov2680_s_g_frame_interval(struct v4l2_subdev * sd,struct v4l2_subdev_frame_interval * fi)614 static int ov2680_s_g_frame_interval(struct v4l2_subdev *sd,
615 struct v4l2_subdev_frame_interval *fi)
616 {
617 struct ov2680_dev *sensor = to_ov2680_dev(sd);
618
619 mutex_lock(&sensor->lock);
620 fi->interval = sensor->frame_interval;
621 mutex_unlock(&sensor->lock);
622
623 return 0;
624 }
625
ov2680_s_stream(struct v4l2_subdev * sd,int enable)626 static int ov2680_s_stream(struct v4l2_subdev *sd, int enable)
627 {
628 struct ov2680_dev *sensor = to_ov2680_dev(sd);
629 int ret = 0;
630
631 mutex_lock(&sensor->lock);
632
633 if (sensor->is_streaming == !!enable)
634 goto unlock;
635
636 if (enable && sensor->mode_pending_changes) {
637 ret = ov2680_mode_set(sensor);
638 if (ret < 0)
639 goto unlock;
640 }
641
642 if (enable)
643 ret = ov2680_stream_enable(sensor);
644 else
645 ret = ov2680_stream_disable(sensor);
646
647 sensor->is_streaming = !!enable;
648
649 unlock:
650 mutex_unlock(&sensor->lock);
651
652 return ret;
653 }
654
ov2680_enum_mbus_code(struct v4l2_subdev * sd,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_mbus_code_enum * code)655 static int ov2680_enum_mbus_code(struct v4l2_subdev *sd,
656 struct v4l2_subdev_pad_config *cfg,
657 struct v4l2_subdev_mbus_code_enum *code)
658 {
659 struct ov2680_dev *sensor = to_ov2680_dev(sd);
660
661 if (code->pad != 0 || code->index != 0)
662 return -EINVAL;
663
664 code->code = sensor->fmt.code;
665
666 return 0;
667 }
668
ov2680_get_fmt(struct v4l2_subdev * sd,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_format * format)669 static int ov2680_get_fmt(struct v4l2_subdev *sd,
670 struct v4l2_subdev_pad_config *cfg,
671 struct v4l2_subdev_format *format)
672 {
673 struct ov2680_dev *sensor = to_ov2680_dev(sd);
674 struct v4l2_mbus_framefmt *fmt = NULL;
675 int ret = 0;
676
677 if (format->pad != 0)
678 return -EINVAL;
679
680 mutex_lock(&sensor->lock);
681
682 if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
683 #ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
684 fmt = v4l2_subdev_get_try_format(&sensor->sd, cfg, format->pad);
685 #else
686 ret = -ENOTTY;
687 #endif
688 } else {
689 fmt = &sensor->fmt;
690 }
691
692 if (fmt)
693 format->format = *fmt;
694
695 mutex_unlock(&sensor->lock);
696
697 return ret;
698 }
699
ov2680_set_fmt(struct v4l2_subdev * sd,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_format * format)700 static int ov2680_set_fmt(struct v4l2_subdev *sd,
701 struct v4l2_subdev_pad_config *cfg,
702 struct v4l2_subdev_format *format)
703 {
704 struct ov2680_dev *sensor = to_ov2680_dev(sd);
705 struct v4l2_mbus_framefmt *fmt = &format->format;
706 #ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
707 struct v4l2_mbus_framefmt *try_fmt;
708 #endif
709 const struct ov2680_mode_info *mode;
710 int ret = 0;
711
712 if (format->pad != 0)
713 return -EINVAL;
714
715 mutex_lock(&sensor->lock);
716
717 if (sensor->is_streaming) {
718 ret = -EBUSY;
719 goto unlock;
720 }
721
722 mode = v4l2_find_nearest_size(ov2680_mode_data,
723 ARRAY_SIZE(ov2680_mode_data), width,
724 height, fmt->width, fmt->height);
725 if (!mode) {
726 ret = -EINVAL;
727 goto unlock;
728 }
729
730 if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
731 #ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
732 try_fmt = v4l2_subdev_get_try_format(sd, cfg, 0);
733 format->format = *try_fmt;
734 #else
735 ret = -ENOTTY;
736 #endif
737
738 goto unlock;
739 }
740
741 fmt->width = mode->width;
742 fmt->height = mode->height;
743 fmt->code = sensor->fmt.code;
744 fmt->colorspace = sensor->fmt.colorspace;
745
746 sensor->current_mode = mode;
747 sensor->fmt = format->format;
748 sensor->mode_pending_changes = true;
749
750 unlock:
751 mutex_unlock(&sensor->lock);
752
753 return ret;
754 }
755
ov2680_init_cfg(struct v4l2_subdev * sd,struct v4l2_subdev_pad_config * cfg)756 static int ov2680_init_cfg(struct v4l2_subdev *sd,
757 struct v4l2_subdev_pad_config *cfg)
758 {
759 struct v4l2_subdev_format fmt = {
760 .which = cfg ? V4L2_SUBDEV_FORMAT_TRY
761 : V4L2_SUBDEV_FORMAT_ACTIVE,
762 .format = {
763 .width = 800,
764 .height = 600,
765 }
766 };
767
768 return ov2680_set_fmt(sd, cfg, &fmt);
769 }
770
ov2680_enum_frame_size(struct v4l2_subdev * sd,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_frame_size_enum * fse)771 static int ov2680_enum_frame_size(struct v4l2_subdev *sd,
772 struct v4l2_subdev_pad_config *cfg,
773 struct v4l2_subdev_frame_size_enum *fse)
774 {
775 int index = fse->index;
776
777 if (index >= OV2680_MODE_MAX || index < 0)
778 return -EINVAL;
779
780 fse->min_width = ov2680_mode_data[index].width;
781 fse->min_height = ov2680_mode_data[index].height;
782 fse->max_width = ov2680_mode_data[index].width;
783 fse->max_height = ov2680_mode_data[index].height;
784
785 return 0;
786 }
787
ov2680_enum_frame_interval(struct v4l2_subdev * sd,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_frame_interval_enum * fie)788 static int ov2680_enum_frame_interval(struct v4l2_subdev *sd,
789 struct v4l2_subdev_pad_config *cfg,
790 struct v4l2_subdev_frame_interval_enum *fie)
791 {
792 struct v4l2_fract tpf;
793
794 if (fie->index >= OV2680_MODE_MAX || fie->width > OV2680_WIDTH_MAX ||
795 fie->height > OV2680_HEIGHT_MAX ||
796 fie->which > V4L2_SUBDEV_FORMAT_ACTIVE)
797 return -EINVAL;
798
799 tpf.denominator = OV2680_FRAME_RATE;
800 tpf.numerator = 1;
801
802 fie->interval = tpf;
803
804 return 0;
805 }
806
ov2680_g_volatile_ctrl(struct v4l2_ctrl * ctrl)807 static int ov2680_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
808 {
809 struct v4l2_subdev *sd = ctrl_to_sd(ctrl);
810 struct ov2680_dev *sensor = to_ov2680_dev(sd);
811 struct ov2680_ctrls *ctrls = &sensor->ctrls;
812 int val;
813
814 if (!sensor->is_enabled)
815 return 0;
816
817 switch (ctrl->id) {
818 case V4L2_CID_GAIN:
819 val = ov2680_gain_get(sensor);
820 if (val < 0)
821 return val;
822 ctrls->gain->val = val;
823 break;
824 case V4L2_CID_EXPOSURE:
825 val = ov2680_exposure_get(sensor);
826 if (val < 0)
827 return val;
828 ctrls->exposure->val = val;
829 break;
830 }
831
832 return 0;
833 }
834
ov2680_s_ctrl(struct v4l2_ctrl * ctrl)835 static int ov2680_s_ctrl(struct v4l2_ctrl *ctrl)
836 {
837 struct v4l2_subdev *sd = ctrl_to_sd(ctrl);
838 struct ov2680_dev *sensor = to_ov2680_dev(sd);
839 struct ov2680_ctrls *ctrls = &sensor->ctrls;
840
841 if (!sensor->is_enabled)
842 return 0;
843
844 switch (ctrl->id) {
845 case V4L2_CID_AUTOGAIN:
846 return ov2680_gain_set(sensor, !!ctrl->val);
847 case V4L2_CID_GAIN:
848 return ov2680_gain_set(sensor, !!ctrls->auto_gain->val);
849 case V4L2_CID_EXPOSURE_AUTO:
850 return ov2680_exposure_set(sensor, !!ctrl->val);
851 case V4L2_CID_EXPOSURE:
852 return ov2680_exposure_set(sensor, !!ctrls->auto_exp->val);
853 case V4L2_CID_VFLIP:
854 if (sensor->is_streaming)
855 return -EBUSY;
856 if (ctrl->val)
857 return ov2680_vflip_enable(sensor);
858 else
859 return ov2680_vflip_disable(sensor);
860 case V4L2_CID_HFLIP:
861 if (sensor->is_streaming)
862 return -EBUSY;
863 if (ctrl->val)
864 return ov2680_hflip_enable(sensor);
865 else
866 return ov2680_hflip_disable(sensor);
867 case V4L2_CID_TEST_PATTERN:
868 return ov2680_test_pattern_set(sensor, ctrl->val);
869 default:
870 break;
871 }
872
873 return -EINVAL;
874 }
875
876 static const struct v4l2_ctrl_ops ov2680_ctrl_ops = {
877 .g_volatile_ctrl = ov2680_g_volatile_ctrl,
878 .s_ctrl = ov2680_s_ctrl,
879 };
880
881 static const struct v4l2_subdev_core_ops ov2680_core_ops = {
882 .s_power = ov2680_s_power,
883 };
884
885 static const struct v4l2_subdev_video_ops ov2680_video_ops = {
886 .g_frame_interval = ov2680_s_g_frame_interval,
887 .s_frame_interval = ov2680_s_g_frame_interval,
888 .s_stream = ov2680_s_stream,
889 };
890
891 static const struct v4l2_subdev_pad_ops ov2680_pad_ops = {
892 .init_cfg = ov2680_init_cfg,
893 .enum_mbus_code = ov2680_enum_mbus_code,
894 .get_fmt = ov2680_get_fmt,
895 .set_fmt = ov2680_set_fmt,
896 .enum_frame_size = ov2680_enum_frame_size,
897 .enum_frame_interval = ov2680_enum_frame_interval,
898 };
899
900 static const struct v4l2_subdev_ops ov2680_subdev_ops = {
901 .core = &ov2680_core_ops,
902 .video = &ov2680_video_ops,
903 .pad = &ov2680_pad_ops,
904 };
905
ov2680_mode_init(struct ov2680_dev * sensor)906 static int ov2680_mode_init(struct ov2680_dev *sensor)
907 {
908 const struct ov2680_mode_info *init_mode;
909
910 /* set initial mode */
911 sensor->fmt.code = MEDIA_BUS_FMT_SBGGR10_1X10;
912 sensor->fmt.width = 800;
913 sensor->fmt.height = 600;
914 sensor->fmt.field = V4L2_FIELD_NONE;
915 sensor->fmt.colorspace = V4L2_COLORSPACE_SRGB;
916
917 sensor->frame_interval.denominator = OV2680_FRAME_RATE;
918 sensor->frame_interval.numerator = 1;
919
920 init_mode = &ov2680_mode_init_data;
921
922 sensor->current_mode = init_mode;
923
924 sensor->mode_pending_changes = true;
925
926 return 0;
927 }
928
ov2680_v4l2_init(struct ov2680_dev * sensor)929 static int ov2680_v4l2_init(struct ov2680_dev *sensor)
930 {
931 const struct v4l2_ctrl_ops *ops = &ov2680_ctrl_ops;
932 struct ov2680_ctrls *ctrls = &sensor->ctrls;
933 struct v4l2_ctrl_handler *hdl = &ctrls->handler;
934 int ret = 0;
935
936 v4l2_i2c_subdev_init(&sensor->sd, sensor->i2c_client,
937 &ov2680_subdev_ops);
938
939 #ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
940 sensor->sd.flags = V4L2_SUBDEV_FL_HAS_DEVNODE;
941 #endif
942 sensor->pad.flags = MEDIA_PAD_FL_SOURCE;
943 sensor->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
944
945 ret = media_entity_pads_init(&sensor->sd.entity, 1, &sensor->pad);
946 if (ret < 0)
947 return ret;
948
949 v4l2_ctrl_handler_init(hdl, 7);
950
951 hdl->lock = &sensor->lock;
952
953 ctrls->vflip = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_VFLIP, 0, 1, 1, 0);
954 ctrls->hflip = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_HFLIP, 0, 1, 1, 0);
955
956 ctrls->test_pattern = v4l2_ctrl_new_std_menu_items(hdl,
957 &ov2680_ctrl_ops, V4L2_CID_TEST_PATTERN,
958 ARRAY_SIZE(test_pattern_menu) - 1,
959 0, 0, test_pattern_menu);
960
961 ctrls->auto_exp = v4l2_ctrl_new_std_menu(hdl, ops,
962 V4L2_CID_EXPOSURE_AUTO,
963 V4L2_EXPOSURE_MANUAL, 0,
964 V4L2_EXPOSURE_AUTO);
965
966 ctrls->exposure = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_EXPOSURE,
967 0, 32767, 1, 0);
968
969 ctrls->auto_gain = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_AUTOGAIN,
970 0, 1, 1, 1);
971 ctrls->gain = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_GAIN, 0, 2047, 1, 0);
972
973 if (hdl->error) {
974 ret = hdl->error;
975 goto cleanup_entity;
976 }
977
978 ctrls->gain->flags |= V4L2_CTRL_FLAG_VOLATILE;
979 ctrls->exposure->flags |= V4L2_CTRL_FLAG_VOLATILE;
980
981 v4l2_ctrl_auto_cluster(2, &ctrls->auto_gain, 0, true);
982 v4l2_ctrl_auto_cluster(2, &ctrls->auto_exp, 1, true);
983
984 sensor->sd.ctrl_handler = hdl;
985
986 ret = v4l2_async_register_subdev(&sensor->sd);
987 if (ret < 0)
988 goto cleanup_entity;
989
990 return 0;
991
992 cleanup_entity:
993 media_entity_cleanup(&sensor->sd.entity);
994 v4l2_ctrl_handler_free(hdl);
995
996 return ret;
997 }
998
ov2680_get_regulators(struct ov2680_dev * sensor)999 static int ov2680_get_regulators(struct ov2680_dev *sensor)
1000 {
1001 int i;
1002
1003 for (i = 0; i < OV2680_NUM_SUPPLIES; i++)
1004 sensor->supplies[i].supply = ov2680_supply_name[i];
1005
1006 return devm_regulator_bulk_get(&sensor->i2c_client->dev,
1007 OV2680_NUM_SUPPLIES,
1008 sensor->supplies);
1009 }
1010
ov2680_check_id(struct ov2680_dev * sensor)1011 static int ov2680_check_id(struct ov2680_dev *sensor)
1012 {
1013 struct device *dev = ov2680_to_dev(sensor);
1014 u32 chip_id;
1015 int ret;
1016
1017 ov2680_power_on(sensor);
1018
1019 ret = ov2680_read_reg16(sensor, OV2680_REG_CHIP_ID_HIGH, &chip_id);
1020 if (ret < 0) {
1021 dev_err(dev, "failed to read chip id high\n");
1022 return -ENODEV;
1023 }
1024
1025 if (chip_id != OV2680_CHIP_ID) {
1026 dev_err(dev, "chip id: 0x%04x does not match expected 0x%04x\n",
1027 chip_id, OV2680_CHIP_ID);
1028 return -ENODEV;
1029 }
1030
1031 return 0;
1032 }
1033
ov2860_parse_dt(struct ov2680_dev * sensor)1034 static int ov2860_parse_dt(struct ov2680_dev *sensor)
1035 {
1036 struct device *dev = ov2680_to_dev(sensor);
1037 int ret;
1038
1039 sensor->reset_gpio = devm_gpiod_get_optional(dev, "reset",
1040 GPIOD_OUT_HIGH);
1041 ret = PTR_ERR_OR_ZERO(sensor->reset_gpio);
1042 if (ret < 0) {
1043 dev_dbg(dev, "error while getting reset gpio: %d\n", ret);
1044 return ret;
1045 }
1046
1047 sensor->xvclk = devm_clk_get(dev, "xvclk");
1048 if (IS_ERR(sensor->xvclk)) {
1049 dev_err(dev, "xvclk clock missing or invalid\n");
1050 return PTR_ERR(sensor->xvclk);
1051 }
1052
1053 sensor->xvclk_freq = clk_get_rate(sensor->xvclk);
1054 if (sensor->xvclk_freq != OV2680_XVCLK_VALUE) {
1055 dev_err(dev, "wrong xvclk frequency %d HZ, expected: %d Hz\n",
1056 sensor->xvclk_freq, OV2680_XVCLK_VALUE);
1057 return -EINVAL;
1058 }
1059
1060 return 0;
1061 }
1062
ov2680_probe(struct i2c_client * client)1063 static int ov2680_probe(struct i2c_client *client)
1064 {
1065 struct device *dev = &client->dev;
1066 struct ov2680_dev *sensor;
1067 int ret;
1068
1069 sensor = devm_kzalloc(dev, sizeof(*sensor), GFP_KERNEL);
1070 if (!sensor)
1071 return -ENOMEM;
1072
1073 sensor->i2c_client = client;
1074
1075 ret = ov2860_parse_dt(sensor);
1076 if (ret < 0)
1077 return -EINVAL;
1078
1079 ret = ov2680_mode_init(sensor);
1080 if (ret < 0)
1081 return ret;
1082
1083 ret = ov2680_get_regulators(sensor);
1084 if (ret < 0) {
1085 dev_err(dev, "failed to get regulators\n");
1086 return ret;
1087 }
1088
1089 mutex_init(&sensor->lock);
1090
1091 ret = ov2680_v4l2_init(sensor);
1092 if (ret < 0)
1093 goto lock_destroy;
1094
1095 ret = ov2680_check_id(sensor);
1096 if (ret < 0)
1097 goto error_cleanup;
1098
1099 dev_info(dev, "ov2680 init correctly\n");
1100
1101 return 0;
1102
1103 error_cleanup:
1104 dev_err(dev, "ov2680 init fail: %d\n", ret);
1105
1106 media_entity_cleanup(&sensor->sd.entity);
1107 v4l2_async_unregister_subdev(&sensor->sd);
1108 v4l2_ctrl_handler_free(&sensor->ctrls.handler);
1109
1110 lock_destroy:
1111 mutex_destroy(&sensor->lock);
1112
1113 return ret;
1114 }
1115
ov2680_remove(struct i2c_client * client)1116 static int ov2680_remove(struct i2c_client *client)
1117 {
1118 struct v4l2_subdev *sd = i2c_get_clientdata(client);
1119 struct ov2680_dev *sensor = to_ov2680_dev(sd);
1120
1121 v4l2_async_unregister_subdev(&sensor->sd);
1122 mutex_destroy(&sensor->lock);
1123 media_entity_cleanup(&sensor->sd.entity);
1124 v4l2_ctrl_handler_free(&sensor->ctrls.handler);
1125
1126 return 0;
1127 }
1128
ov2680_suspend(struct device * dev)1129 static int __maybe_unused ov2680_suspend(struct device *dev)
1130 {
1131 struct i2c_client *client = to_i2c_client(dev);
1132 struct v4l2_subdev *sd = i2c_get_clientdata(client);
1133 struct ov2680_dev *sensor = to_ov2680_dev(sd);
1134
1135 if (sensor->is_streaming)
1136 ov2680_stream_disable(sensor);
1137
1138 return 0;
1139 }
1140
ov2680_resume(struct device * dev)1141 static int __maybe_unused ov2680_resume(struct device *dev)
1142 {
1143 struct i2c_client *client = to_i2c_client(dev);
1144 struct v4l2_subdev *sd = i2c_get_clientdata(client);
1145 struct ov2680_dev *sensor = to_ov2680_dev(sd);
1146 int ret;
1147
1148 if (sensor->is_streaming) {
1149 ret = ov2680_stream_enable(sensor);
1150 if (ret < 0)
1151 goto stream_disable;
1152 }
1153
1154 return 0;
1155
1156 stream_disable:
1157 ov2680_stream_disable(sensor);
1158 sensor->is_streaming = false;
1159
1160 return ret;
1161 }
1162
1163 static const struct dev_pm_ops ov2680_pm_ops = {
1164 SET_SYSTEM_SLEEP_PM_OPS(ov2680_suspend, ov2680_resume)
1165 };
1166
1167 static const struct of_device_id ov2680_dt_ids[] = {
1168 { .compatible = "ovti,ov2680" },
1169 { /* sentinel */ },
1170 };
1171 MODULE_DEVICE_TABLE(of, ov2680_dt_ids);
1172
1173 static struct i2c_driver ov2680_i2c_driver = {
1174 .driver = {
1175 .name = "ov2680",
1176 .pm = &ov2680_pm_ops,
1177 .of_match_table = of_match_ptr(ov2680_dt_ids),
1178 },
1179 .probe_new = ov2680_probe,
1180 .remove = ov2680_remove,
1181 };
1182 module_i2c_driver(ov2680_i2c_driver);
1183
1184 MODULE_AUTHOR("Rui Miguel Silva <rui.silva@linaro.org>");
1185 MODULE_DESCRIPTION("OV2680 CMOS Image Sensor driver");
1186 MODULE_LICENSE("GPL v2");
1187
