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 #define OV2680_DEFAULT_WIDTH 800
58 #define OV2680_DEFAULT_HEIGHT 600
59
60 enum ov2680_mode_id {
61 OV2680_MODE_QUXGA_800_600,
62 OV2680_MODE_720P_1280_720,
63 OV2680_MODE_UXGA_1600_1200,
64 OV2680_MODE_MAX,
65 };
66
67 struct reg_value {
68 u16 reg_addr;
69 u8 val;
70 };
71
72 static const char * const ov2680_supply_name[] = {
73 "DOVDD",
74 "DVDD",
75 "AVDD",
76 };
77
78 #define OV2680_NUM_SUPPLIES ARRAY_SIZE(ov2680_supply_name)
79
80 struct ov2680_mode_info {
81 const char *name;
82 enum ov2680_mode_id id;
83 u32 width;
84 u32 height;
85 const struct reg_value *reg_data;
86 u32 reg_data_size;
87 };
88
89 struct ov2680_ctrls {
90 struct v4l2_ctrl_handler handler;
91 struct v4l2_ctrl *exposure;
92 struct v4l2_ctrl *gain;
93 struct v4l2_ctrl *hflip;
94 struct v4l2_ctrl *vflip;
95 struct v4l2_ctrl *test_pattern;
96 };
97
98 struct ov2680_dev {
99 struct i2c_client *i2c_client;
100 struct v4l2_subdev sd;
101
102 struct media_pad pad;
103 struct clk *xvclk;
104 u32 xvclk_freq;
105 struct regulator_bulk_data supplies[OV2680_NUM_SUPPLIES];
106
107 struct gpio_desc *reset_gpio;
108 struct mutex lock; /* protect members */
109
110 bool mode_pending_changes;
111 bool is_enabled;
112 bool is_streaming;
113
114 struct ov2680_ctrls ctrls;
115 struct v4l2_mbus_framefmt fmt;
116 struct v4l2_fract frame_interval;
117
118 const struct ov2680_mode_info *current_mode;
119 };
120
121 static const char * const test_pattern_menu[] = {
122 "Disabled",
123 "Color Bars",
124 "Random Data",
125 "Square",
126 "Black Image",
127 };
128
129 static const int ov2680_hv_flip_bayer_order[] = {
130 MEDIA_BUS_FMT_SBGGR10_1X10,
131 MEDIA_BUS_FMT_SGRBG10_1X10,
132 MEDIA_BUS_FMT_SGBRG10_1X10,
133 MEDIA_BUS_FMT_SRGGB10_1X10,
134 };
135
136 static const struct reg_value ov2680_setting_30fps_QUXGA_800_600[] = {
137 {0x3086, 0x01}, {0x370a, 0x23}, {0x3808, 0x03}, {0x3809, 0x20},
138 {0x380a, 0x02}, {0x380b, 0x58}, {0x380c, 0x06}, {0x380d, 0xac},
139 {0x380e, 0x02}, {0x380f, 0x84}, {0x3811, 0x04}, {0x3813, 0x04},
140 {0x3814, 0x31}, {0x3815, 0x31}, {0x3820, 0xc0}, {0x4008, 0x00},
141 {0x4009, 0x03}, {0x4837, 0x1e}, {0x3501, 0x4e}, {0x3502, 0xe0},
142 {0x3503, 0x03},
143 };
144
145 static const struct reg_value ov2680_setting_30fps_720P_1280_720[] = {
146 {0x3086, 0x00}, {0x3808, 0x05}, {0x3809, 0x00}, {0x380a, 0x02},
147 {0x380b, 0xd0}, {0x380c, 0x06}, {0x380d, 0xa8}, {0x380e, 0x05},
148 {0x380f, 0x0e}, {0x3811, 0x08}, {0x3813, 0x06}, {0x3814, 0x11},
149 {0x3815, 0x11}, {0x3820, 0xc0}, {0x4008, 0x00},
150 };
151
152 static const struct reg_value ov2680_setting_30fps_UXGA_1600_1200[] = {
153 {0x3086, 0x00}, {0x3501, 0x4e}, {0x3502, 0xe0}, {0x3808, 0x06},
154 {0x3809, 0x40}, {0x380a, 0x04}, {0x380b, 0xb0}, {0x380c, 0x06},
155 {0x380d, 0xa8}, {0x380e, 0x05}, {0x380f, 0x0e}, {0x3811, 0x00},
156 {0x3813, 0x00}, {0x3814, 0x11}, {0x3815, 0x11}, {0x3820, 0xc0},
157 {0x4008, 0x00}, {0x4837, 0x18}
158 };
159
160 static const struct ov2680_mode_info ov2680_mode_init_data = {
161 "mode_quxga_800_600", OV2680_MODE_QUXGA_800_600, 800, 600,
162 ov2680_setting_30fps_QUXGA_800_600,
163 ARRAY_SIZE(ov2680_setting_30fps_QUXGA_800_600),
164 };
165
166 static const struct ov2680_mode_info ov2680_mode_data[OV2680_MODE_MAX] = {
167 {"mode_quxga_800_600", OV2680_MODE_QUXGA_800_600,
168 800, 600, ov2680_setting_30fps_QUXGA_800_600,
169 ARRAY_SIZE(ov2680_setting_30fps_QUXGA_800_600)},
170 {"mode_720p_1280_720", OV2680_MODE_720P_1280_720,
171 1280, 720, ov2680_setting_30fps_720P_1280_720,
172 ARRAY_SIZE(ov2680_setting_30fps_720P_1280_720)},
173 {"mode_uxga_1600_1200", OV2680_MODE_UXGA_1600_1200,
174 1600, 1200, ov2680_setting_30fps_UXGA_1600_1200,
175 ARRAY_SIZE(ov2680_setting_30fps_UXGA_1600_1200)},
176 };
177
to_ov2680_dev(struct v4l2_subdev * sd)178 static struct ov2680_dev *to_ov2680_dev(struct v4l2_subdev *sd)
179 {
180 return container_of(sd, struct ov2680_dev, sd);
181 }
182
ov2680_to_dev(struct ov2680_dev * sensor)183 static struct device *ov2680_to_dev(struct ov2680_dev *sensor)
184 {
185 return &sensor->i2c_client->dev;
186 }
187
ctrl_to_sd(struct v4l2_ctrl * ctrl)188 static inline struct v4l2_subdev *ctrl_to_sd(struct v4l2_ctrl *ctrl)
189 {
190 return &container_of(ctrl->handler, struct ov2680_dev,
191 ctrls.handler)->sd;
192 }
193
__ov2680_write_reg(struct ov2680_dev * sensor,u16 reg,unsigned int len,u32 val)194 static int __ov2680_write_reg(struct ov2680_dev *sensor, u16 reg,
195 unsigned int len, u32 val)
196 {
197 struct i2c_client *client = sensor->i2c_client;
198 u8 buf[6];
199 int ret;
200
201 if (len > 4)
202 return -EINVAL;
203
204 put_unaligned_be16(reg, buf);
205 put_unaligned_be32(val << (8 * (4 - len)), buf + 2);
206 ret = i2c_master_send(client, buf, len + 2);
207 if (ret != len + 2) {
208 dev_err(&client->dev, "write error: reg=0x%4x: %d\n", reg, ret);
209 return -EIO;
210 }
211
212 return 0;
213 }
214
215 #define ov2680_write_reg(s, r, v) \
216 __ov2680_write_reg(s, r, OV2680_REG_VALUE_8BIT, v)
217
218 #define ov2680_write_reg16(s, r, v) \
219 __ov2680_write_reg(s, r, OV2680_REG_VALUE_16BIT, v)
220
221 #define ov2680_write_reg24(s, r, v) \
222 __ov2680_write_reg(s, r, OV2680_REG_VALUE_24BIT, v)
223
__ov2680_read_reg(struct ov2680_dev * sensor,u16 reg,unsigned int len,u32 * val)224 static int __ov2680_read_reg(struct ov2680_dev *sensor, u16 reg,
225 unsigned int len, u32 *val)
226 {
227 struct i2c_client *client = sensor->i2c_client;
228 struct i2c_msg msgs[2];
229 u8 addr_buf[2] = { reg >> 8, reg & 0xff };
230 u8 data_buf[4] = { 0, };
231 int ret;
232
233 if (len > 4)
234 return -EINVAL;
235
236 msgs[0].addr = client->addr;
237 msgs[0].flags = 0;
238 msgs[0].len = ARRAY_SIZE(addr_buf);
239 msgs[0].buf = addr_buf;
240
241 msgs[1].addr = client->addr;
242 msgs[1].flags = I2C_M_RD;
243 msgs[1].len = len;
244 msgs[1].buf = &data_buf[4 - len];
245
246 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
247 if (ret != ARRAY_SIZE(msgs)) {
248 dev_err(&client->dev, "read error: reg=0x%4x: %d\n", reg, ret);
249 return -EIO;
250 }
251
252 *val = get_unaligned_be32(data_buf);
253
254 return 0;
255 }
256
257 #define ov2680_read_reg(s, r, v) \
258 __ov2680_read_reg(s, r, OV2680_REG_VALUE_8BIT, v)
259
260 #define ov2680_read_reg16(s, r, v) \
261 __ov2680_read_reg(s, r, OV2680_REG_VALUE_16BIT, v)
262
263 #define ov2680_read_reg24(s, r, v) \
264 __ov2680_read_reg(s, r, OV2680_REG_VALUE_24BIT, v)
265
ov2680_mod_reg(struct ov2680_dev * sensor,u16 reg,u8 mask,u8 val)266 static int ov2680_mod_reg(struct ov2680_dev *sensor, u16 reg, u8 mask, u8 val)
267 {
268 u32 readval;
269 int ret;
270
271 ret = ov2680_read_reg(sensor, reg, &readval);
272 if (ret < 0)
273 return ret;
274
275 readval &= ~mask;
276 val &= mask;
277 val |= readval;
278
279 return ov2680_write_reg(sensor, reg, val);
280 }
281
ov2680_load_regs(struct ov2680_dev * sensor,const struct ov2680_mode_info * mode)282 static int ov2680_load_regs(struct ov2680_dev *sensor,
283 const struct ov2680_mode_info *mode)
284 {
285 const struct reg_value *regs = mode->reg_data;
286 unsigned int i;
287 int ret = 0;
288 u16 reg_addr;
289 u8 val;
290
291 for (i = 0; i < mode->reg_data_size; ++i, ++regs) {
292 reg_addr = regs->reg_addr;
293 val = regs->val;
294
295 ret = ov2680_write_reg(sensor, reg_addr, val);
296 if (ret)
297 break;
298 }
299
300 return ret;
301 }
302
ov2680_power_up(struct ov2680_dev * sensor)303 static void ov2680_power_up(struct ov2680_dev *sensor)
304 {
305 if (!sensor->reset_gpio)
306 return;
307
308 gpiod_set_value(sensor->reset_gpio, 0);
309 usleep_range(5000, 10000);
310 }
311
ov2680_power_down(struct ov2680_dev * sensor)312 static void ov2680_power_down(struct ov2680_dev *sensor)
313 {
314 if (!sensor->reset_gpio)
315 return;
316
317 gpiod_set_value(sensor->reset_gpio, 1);
318 usleep_range(5000, 10000);
319 }
320
ov2680_set_bayer_order(struct ov2680_dev * sensor,struct v4l2_mbus_framefmt * fmt)321 static void ov2680_set_bayer_order(struct ov2680_dev *sensor,
322 struct v4l2_mbus_framefmt *fmt)
323 {
324 int hv_flip = 0;
325
326 if (sensor->ctrls.vflip && sensor->ctrls.vflip->val)
327 hv_flip += 1;
328
329 if (sensor->ctrls.hflip && sensor->ctrls.hflip->val)
330 hv_flip += 2;
331
332 fmt->code = ov2680_hv_flip_bayer_order[hv_flip];
333 }
334
ov2680_fill_format(struct ov2680_dev * sensor,struct v4l2_mbus_framefmt * fmt,unsigned int width,unsigned int height)335 static void ov2680_fill_format(struct ov2680_dev *sensor,
336 struct v4l2_mbus_framefmt *fmt,
337 unsigned int width, unsigned int height)
338 {
339 memset(fmt, 0, sizeof(*fmt));
340 fmt->width = width;
341 fmt->height = height;
342 fmt->field = V4L2_FIELD_NONE;
343 fmt->colorspace = V4L2_COLORSPACE_SRGB;
344 ov2680_set_bayer_order(sensor, fmt);
345 }
346
ov2680_set_vflip(struct ov2680_dev * sensor,s32 val)347 static int ov2680_set_vflip(struct ov2680_dev *sensor, s32 val)
348 {
349 int ret;
350
351 if (sensor->is_streaming)
352 return -EBUSY;
353
354 ret = ov2680_mod_reg(sensor, OV2680_REG_FORMAT1,
355 BIT(2), val ? BIT(2) : 0);
356 if (ret < 0)
357 return ret;
358
359 ov2680_set_bayer_order(sensor, &sensor->fmt);
360 return 0;
361 }
362
ov2680_set_hflip(struct ov2680_dev * sensor,s32 val)363 static int ov2680_set_hflip(struct ov2680_dev *sensor, s32 val)
364 {
365 int ret;
366
367 if (sensor->is_streaming)
368 return -EBUSY;
369
370 ret = ov2680_mod_reg(sensor, OV2680_REG_FORMAT2,
371 BIT(2), val ? BIT(2) : 0);
372 if (ret < 0)
373 return ret;
374
375 ov2680_set_bayer_order(sensor, &sensor->fmt);
376 return 0;
377 }
378
ov2680_test_pattern_set(struct ov2680_dev * sensor,int value)379 static int ov2680_test_pattern_set(struct ov2680_dev *sensor, int value)
380 {
381 int ret;
382
383 if (!value)
384 return ov2680_mod_reg(sensor, OV2680_REG_ISP_CTRL00, BIT(7), 0);
385
386 ret = ov2680_mod_reg(sensor, OV2680_REG_ISP_CTRL00, 0x03, value - 1);
387 if (ret < 0)
388 return ret;
389
390 ret = ov2680_mod_reg(sensor, OV2680_REG_ISP_CTRL00, BIT(7), BIT(7));
391 if (ret < 0)
392 return ret;
393
394 return 0;
395 }
396
ov2680_gain_set(struct ov2680_dev * sensor,u32 gain)397 static int ov2680_gain_set(struct ov2680_dev *sensor, u32 gain)
398 {
399 return ov2680_write_reg16(sensor, OV2680_REG_GAIN_PK, gain);
400 }
401
ov2680_exposure_set(struct ov2680_dev * sensor,u32 exp)402 static int ov2680_exposure_set(struct ov2680_dev *sensor, u32 exp)
403 {
404 return ov2680_write_reg24(sensor, OV2680_REG_EXPOSURE_PK_HIGH,
405 exp << 4);
406 }
407
ov2680_stream_enable(struct ov2680_dev * sensor)408 static int ov2680_stream_enable(struct ov2680_dev *sensor)
409 {
410 return ov2680_write_reg(sensor, OV2680_REG_STREAM_CTRL, 1);
411 }
412
ov2680_stream_disable(struct ov2680_dev * sensor)413 static int ov2680_stream_disable(struct ov2680_dev *sensor)
414 {
415 return ov2680_write_reg(sensor, OV2680_REG_STREAM_CTRL, 0);
416 }
417
ov2680_mode_set(struct ov2680_dev * sensor)418 static int ov2680_mode_set(struct ov2680_dev *sensor)
419 {
420 int ret;
421
422 ret = ov2680_load_regs(sensor, sensor->current_mode);
423 if (ret < 0)
424 return ret;
425
426 /* Restore value of all ctrls */
427 ret = __v4l2_ctrl_handler_setup(&sensor->ctrls.handler);
428 if (ret < 0)
429 return ret;
430
431 sensor->mode_pending_changes = false;
432
433 return 0;
434 }
435
ov2680_mode_restore(struct ov2680_dev * sensor)436 static int ov2680_mode_restore(struct ov2680_dev *sensor)
437 {
438 int ret;
439
440 ret = ov2680_load_regs(sensor, &ov2680_mode_init_data);
441 if (ret < 0)
442 return ret;
443
444 return ov2680_mode_set(sensor);
445 }
446
ov2680_power_off(struct ov2680_dev * sensor)447 static int ov2680_power_off(struct ov2680_dev *sensor)
448 {
449 if (!sensor->is_enabled)
450 return 0;
451
452 clk_disable_unprepare(sensor->xvclk);
453 ov2680_power_down(sensor);
454 regulator_bulk_disable(OV2680_NUM_SUPPLIES, sensor->supplies);
455 sensor->is_enabled = false;
456
457 return 0;
458 }
459
ov2680_power_on(struct ov2680_dev * sensor)460 static int ov2680_power_on(struct ov2680_dev *sensor)
461 {
462 struct device *dev = ov2680_to_dev(sensor);
463 int ret;
464
465 if (sensor->is_enabled)
466 return 0;
467
468 ret = regulator_bulk_enable(OV2680_NUM_SUPPLIES, sensor->supplies);
469 if (ret < 0) {
470 dev_err(dev, "failed to enable regulators: %d\n", ret);
471 return ret;
472 }
473
474 if (!sensor->reset_gpio) {
475 ret = ov2680_write_reg(sensor, OV2680_REG_SOFT_RESET, 0x01);
476 if (ret != 0) {
477 dev_err(dev, "sensor soft reset failed\n");
478 goto err_disable_regulators;
479 }
480 usleep_range(1000, 2000);
481 } else {
482 ov2680_power_down(sensor);
483 ov2680_power_up(sensor);
484 }
485
486 ret = clk_prepare_enable(sensor->xvclk);
487 if (ret < 0)
488 goto err_disable_regulators;
489
490 sensor->is_enabled = true;
491
492 /* Set clock lane into LP-11 state */
493 ov2680_stream_enable(sensor);
494 usleep_range(1000, 2000);
495 ov2680_stream_disable(sensor);
496
497 return 0;
498
499 err_disable_regulators:
500 regulator_bulk_disable(OV2680_NUM_SUPPLIES, sensor->supplies);
501 return ret;
502 }
503
ov2680_s_power(struct v4l2_subdev * sd,int on)504 static int ov2680_s_power(struct v4l2_subdev *sd, int on)
505 {
506 struct ov2680_dev *sensor = to_ov2680_dev(sd);
507 int ret = 0;
508
509 mutex_lock(&sensor->lock);
510
511 if (on)
512 ret = ov2680_power_on(sensor);
513 else
514 ret = ov2680_power_off(sensor);
515
516 if (on && ret == 0)
517 ret = ov2680_mode_restore(sensor);
518
519 mutex_unlock(&sensor->lock);
520
521 return ret;
522 }
523
ov2680_s_g_frame_interval(struct v4l2_subdev * sd,struct v4l2_subdev_frame_interval * fi)524 static int ov2680_s_g_frame_interval(struct v4l2_subdev *sd,
525 struct v4l2_subdev_frame_interval *fi)
526 {
527 struct ov2680_dev *sensor = to_ov2680_dev(sd);
528
529 mutex_lock(&sensor->lock);
530 fi->interval = sensor->frame_interval;
531 mutex_unlock(&sensor->lock);
532
533 return 0;
534 }
535
ov2680_s_stream(struct v4l2_subdev * sd,int enable)536 static int ov2680_s_stream(struct v4l2_subdev *sd, int enable)
537 {
538 struct ov2680_dev *sensor = to_ov2680_dev(sd);
539 int ret = 0;
540
541 mutex_lock(&sensor->lock);
542
543 if (sensor->is_streaming == !!enable)
544 goto unlock;
545
546 if (enable && sensor->mode_pending_changes) {
547 ret = ov2680_mode_set(sensor);
548 if (ret < 0)
549 goto unlock;
550 }
551
552 if (enable)
553 ret = ov2680_stream_enable(sensor);
554 else
555 ret = ov2680_stream_disable(sensor);
556
557 sensor->is_streaming = !!enable;
558
559 unlock:
560 mutex_unlock(&sensor->lock);
561
562 return ret;
563 }
564
ov2680_enum_mbus_code(struct v4l2_subdev * sd,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_mbus_code_enum * code)565 static int ov2680_enum_mbus_code(struct v4l2_subdev *sd,
566 struct v4l2_subdev_state *sd_state,
567 struct v4l2_subdev_mbus_code_enum *code)
568 {
569 struct ov2680_dev *sensor = to_ov2680_dev(sd);
570
571 if (code->pad != 0 || code->index != 0)
572 return -EINVAL;
573
574 code->code = sensor->fmt.code;
575
576 return 0;
577 }
578
ov2680_get_fmt(struct v4l2_subdev * sd,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_format * format)579 static int ov2680_get_fmt(struct v4l2_subdev *sd,
580 struct v4l2_subdev_state *sd_state,
581 struct v4l2_subdev_format *format)
582 {
583 struct ov2680_dev *sensor = to_ov2680_dev(sd);
584 struct v4l2_mbus_framefmt *fmt = NULL;
585
586 if (format->pad != 0)
587 return -EINVAL;
588
589 mutex_lock(&sensor->lock);
590
591 if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
592 fmt = v4l2_subdev_get_try_format(&sensor->sd, sd_state,
593 format->pad);
594 } else {
595 fmt = &sensor->fmt;
596 }
597
598 format->format = *fmt;
599
600 mutex_unlock(&sensor->lock);
601
602 return 0;
603 }
604
ov2680_set_fmt(struct v4l2_subdev * sd,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_format * format)605 static int ov2680_set_fmt(struct v4l2_subdev *sd,
606 struct v4l2_subdev_state *sd_state,
607 struct v4l2_subdev_format *format)
608 {
609 struct ov2680_dev *sensor = to_ov2680_dev(sd);
610 struct v4l2_mbus_framefmt *try_fmt;
611 const struct ov2680_mode_info *mode;
612 int ret = 0;
613
614 if (format->pad != 0)
615 return -EINVAL;
616
617 mode = v4l2_find_nearest_size(ov2680_mode_data,
618 ARRAY_SIZE(ov2680_mode_data),
619 width, height,
620 format->format.width,
621 format->format.height);
622 if (!mode)
623 return -EINVAL;
624
625 ov2680_fill_format(sensor, &format->format, mode->width, mode->height);
626
627 if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
628 try_fmt = v4l2_subdev_get_try_format(sd, sd_state, 0);
629 *try_fmt = format->format;
630 return 0;
631 }
632
633 mutex_lock(&sensor->lock);
634
635 if (sensor->is_streaming) {
636 ret = -EBUSY;
637 goto unlock;
638 }
639
640 sensor->current_mode = mode;
641 sensor->fmt = format->format;
642 sensor->mode_pending_changes = true;
643
644 unlock:
645 mutex_unlock(&sensor->lock);
646
647 return ret;
648 }
649
ov2680_init_cfg(struct v4l2_subdev * sd,struct v4l2_subdev_state * sd_state)650 static int ov2680_init_cfg(struct v4l2_subdev *sd,
651 struct v4l2_subdev_state *sd_state)
652 {
653 struct ov2680_dev *sensor = to_ov2680_dev(sd);
654
655 ov2680_fill_format(sensor, &sd_state->pads[0].try_fmt,
656 OV2680_DEFAULT_WIDTH, OV2680_DEFAULT_HEIGHT);
657 return 0;
658 }
659
ov2680_enum_frame_size(struct v4l2_subdev * sd,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_frame_size_enum * fse)660 static int ov2680_enum_frame_size(struct v4l2_subdev *sd,
661 struct v4l2_subdev_state *sd_state,
662 struct v4l2_subdev_frame_size_enum *fse)
663 {
664 int index = fse->index;
665
666 if (index >= OV2680_MODE_MAX || index < 0)
667 return -EINVAL;
668
669 fse->min_width = ov2680_mode_data[index].width;
670 fse->min_height = ov2680_mode_data[index].height;
671 fse->max_width = ov2680_mode_data[index].width;
672 fse->max_height = ov2680_mode_data[index].height;
673
674 return 0;
675 }
676
ov2680_enum_frame_interval(struct v4l2_subdev * sd,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_frame_interval_enum * fie)677 static int ov2680_enum_frame_interval(struct v4l2_subdev *sd,
678 struct v4l2_subdev_state *sd_state,
679 struct v4l2_subdev_frame_interval_enum *fie)
680 {
681 struct v4l2_fract tpf;
682
683 if (fie->index >= OV2680_MODE_MAX || fie->width > OV2680_WIDTH_MAX ||
684 fie->height > OV2680_HEIGHT_MAX ||
685 fie->which > V4L2_SUBDEV_FORMAT_ACTIVE)
686 return -EINVAL;
687
688 tpf.denominator = OV2680_FRAME_RATE;
689 tpf.numerator = 1;
690
691 fie->interval = tpf;
692
693 return 0;
694 }
695
ov2680_s_ctrl(struct v4l2_ctrl * ctrl)696 static int ov2680_s_ctrl(struct v4l2_ctrl *ctrl)
697 {
698 struct v4l2_subdev *sd = ctrl_to_sd(ctrl);
699 struct ov2680_dev *sensor = to_ov2680_dev(sd);
700
701 if (!sensor->is_enabled)
702 return 0;
703
704 switch (ctrl->id) {
705 case V4L2_CID_GAIN:
706 return ov2680_gain_set(sensor, ctrl->val);
707 case V4L2_CID_EXPOSURE:
708 return ov2680_exposure_set(sensor, ctrl->val);
709 case V4L2_CID_VFLIP:
710 return ov2680_set_vflip(sensor, ctrl->val);
711 case V4L2_CID_HFLIP:
712 return ov2680_set_hflip(sensor, ctrl->val);
713 case V4L2_CID_TEST_PATTERN:
714 return ov2680_test_pattern_set(sensor, ctrl->val);
715 default:
716 break;
717 }
718
719 return -EINVAL;
720 }
721
722 static const struct v4l2_ctrl_ops ov2680_ctrl_ops = {
723 .s_ctrl = ov2680_s_ctrl,
724 };
725
726 static const struct v4l2_subdev_core_ops ov2680_core_ops = {
727 .s_power = ov2680_s_power,
728 };
729
730 static const struct v4l2_subdev_video_ops ov2680_video_ops = {
731 .g_frame_interval = ov2680_s_g_frame_interval,
732 .s_frame_interval = ov2680_s_g_frame_interval,
733 .s_stream = ov2680_s_stream,
734 };
735
736 static const struct v4l2_subdev_pad_ops ov2680_pad_ops = {
737 .init_cfg = ov2680_init_cfg,
738 .enum_mbus_code = ov2680_enum_mbus_code,
739 .get_fmt = ov2680_get_fmt,
740 .set_fmt = ov2680_set_fmt,
741 .enum_frame_size = ov2680_enum_frame_size,
742 .enum_frame_interval = ov2680_enum_frame_interval,
743 };
744
745 static const struct v4l2_subdev_ops ov2680_subdev_ops = {
746 .core = &ov2680_core_ops,
747 .video = &ov2680_video_ops,
748 .pad = &ov2680_pad_ops,
749 };
750
ov2680_mode_init(struct ov2680_dev * sensor)751 static int ov2680_mode_init(struct ov2680_dev *sensor)
752 {
753 const struct ov2680_mode_info *init_mode;
754
755 /* set initial mode */
756 ov2680_fill_format(sensor, &sensor->fmt,
757 OV2680_DEFAULT_WIDTH, OV2680_DEFAULT_HEIGHT);
758
759 sensor->frame_interval.denominator = OV2680_FRAME_RATE;
760 sensor->frame_interval.numerator = 1;
761
762 init_mode = &ov2680_mode_init_data;
763
764 sensor->current_mode = init_mode;
765
766 sensor->mode_pending_changes = true;
767
768 return 0;
769 }
770
ov2680_v4l2_register(struct ov2680_dev * sensor)771 static int ov2680_v4l2_register(struct ov2680_dev *sensor)
772 {
773 const struct v4l2_ctrl_ops *ops = &ov2680_ctrl_ops;
774 struct ov2680_ctrls *ctrls = &sensor->ctrls;
775 struct v4l2_ctrl_handler *hdl = &ctrls->handler;
776 int ret = 0;
777
778 v4l2_i2c_subdev_init(&sensor->sd, sensor->i2c_client,
779 &ov2680_subdev_ops);
780
781 sensor->sd.flags = V4L2_SUBDEV_FL_HAS_DEVNODE;
782 sensor->pad.flags = MEDIA_PAD_FL_SOURCE;
783 sensor->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
784
785 ret = media_entity_pads_init(&sensor->sd.entity, 1, &sensor->pad);
786 if (ret < 0)
787 return ret;
788
789 v4l2_ctrl_handler_init(hdl, 5);
790
791 hdl->lock = &sensor->lock;
792
793 ctrls->vflip = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_VFLIP, 0, 1, 1, 0);
794 ctrls->hflip = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_HFLIP, 0, 1, 1, 0);
795
796 ctrls->test_pattern = v4l2_ctrl_new_std_menu_items(hdl,
797 &ov2680_ctrl_ops, V4L2_CID_TEST_PATTERN,
798 ARRAY_SIZE(test_pattern_menu) - 1,
799 0, 0, test_pattern_menu);
800
801 ctrls->exposure = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_EXPOSURE,
802 0, 32767, 1, 0);
803
804 ctrls->gain = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_GAIN, 0, 2047, 1, 0);
805
806 if (hdl->error) {
807 ret = hdl->error;
808 goto cleanup_entity;
809 }
810
811 ctrls->vflip->flags |= V4L2_CTRL_FLAG_MODIFY_LAYOUT;
812 ctrls->hflip->flags |= V4L2_CTRL_FLAG_MODIFY_LAYOUT;
813
814 sensor->sd.ctrl_handler = hdl;
815
816 ret = v4l2_async_register_subdev(&sensor->sd);
817 if (ret < 0)
818 goto cleanup_entity;
819
820 return 0;
821
822 cleanup_entity:
823 media_entity_cleanup(&sensor->sd.entity);
824 v4l2_ctrl_handler_free(hdl);
825
826 return ret;
827 }
828
ov2680_get_regulators(struct ov2680_dev * sensor)829 static int ov2680_get_regulators(struct ov2680_dev *sensor)
830 {
831 int i;
832
833 for (i = 0; i < OV2680_NUM_SUPPLIES; i++)
834 sensor->supplies[i].supply = ov2680_supply_name[i];
835
836 return devm_regulator_bulk_get(&sensor->i2c_client->dev,
837 OV2680_NUM_SUPPLIES,
838 sensor->supplies);
839 }
840
ov2680_check_id(struct ov2680_dev * sensor)841 static int ov2680_check_id(struct ov2680_dev *sensor)
842 {
843 struct device *dev = ov2680_to_dev(sensor);
844 u32 chip_id;
845 int ret;
846
847 ov2680_power_on(sensor);
848
849 ret = ov2680_read_reg16(sensor, OV2680_REG_CHIP_ID_HIGH, &chip_id);
850 if (ret < 0) {
851 dev_err(dev, "failed to read chip id high\n");
852 return -ENODEV;
853 }
854
855 if (chip_id != OV2680_CHIP_ID) {
856 dev_err(dev, "chip id: 0x%04x does not match expected 0x%04x\n",
857 chip_id, OV2680_CHIP_ID);
858 return -ENODEV;
859 }
860
861 return 0;
862 }
863
ov2680_parse_dt(struct ov2680_dev * sensor)864 static int ov2680_parse_dt(struct ov2680_dev *sensor)
865 {
866 struct device *dev = ov2680_to_dev(sensor);
867 int ret;
868
869 sensor->reset_gpio = devm_gpiod_get_optional(dev, "reset",
870 GPIOD_OUT_HIGH);
871 ret = PTR_ERR_OR_ZERO(sensor->reset_gpio);
872 if (ret < 0) {
873 dev_dbg(dev, "error while getting reset gpio: %d\n", ret);
874 return ret;
875 }
876
877 sensor->xvclk = devm_clk_get(dev, "xvclk");
878 if (IS_ERR(sensor->xvclk)) {
879 dev_err(dev, "xvclk clock missing or invalid\n");
880 return PTR_ERR(sensor->xvclk);
881 }
882
883 sensor->xvclk_freq = clk_get_rate(sensor->xvclk);
884 if (sensor->xvclk_freq != OV2680_XVCLK_VALUE) {
885 dev_err(dev, "wrong xvclk frequency %d HZ, expected: %d Hz\n",
886 sensor->xvclk_freq, OV2680_XVCLK_VALUE);
887 return -EINVAL;
888 }
889
890 return 0;
891 }
892
ov2680_probe(struct i2c_client * client)893 static int ov2680_probe(struct i2c_client *client)
894 {
895 struct device *dev = &client->dev;
896 struct ov2680_dev *sensor;
897 int ret;
898
899 sensor = devm_kzalloc(dev, sizeof(*sensor), GFP_KERNEL);
900 if (!sensor)
901 return -ENOMEM;
902
903 sensor->i2c_client = client;
904
905 ret = ov2680_parse_dt(sensor);
906 if (ret < 0)
907 return -EINVAL;
908
909 ret = ov2680_mode_init(sensor);
910 if (ret < 0)
911 return ret;
912
913 ret = ov2680_get_regulators(sensor);
914 if (ret < 0) {
915 dev_err(dev, "failed to get regulators\n");
916 return ret;
917 }
918
919 mutex_init(&sensor->lock);
920
921 ret = ov2680_check_id(sensor);
922 if (ret < 0)
923 goto lock_destroy;
924
925 ret = ov2680_v4l2_register(sensor);
926 if (ret < 0)
927 goto lock_destroy;
928
929 dev_info(dev, "ov2680 init correctly\n");
930
931 return 0;
932
933 lock_destroy:
934 dev_err(dev, "ov2680 init fail: %d\n", ret);
935 mutex_destroy(&sensor->lock);
936
937 return ret;
938 }
939
ov2680_remove(struct i2c_client * client)940 static int ov2680_remove(struct i2c_client *client)
941 {
942 struct v4l2_subdev *sd = i2c_get_clientdata(client);
943 struct ov2680_dev *sensor = to_ov2680_dev(sd);
944
945 v4l2_async_unregister_subdev(&sensor->sd);
946 mutex_destroy(&sensor->lock);
947 media_entity_cleanup(&sensor->sd.entity);
948 v4l2_ctrl_handler_free(&sensor->ctrls.handler);
949
950 return 0;
951 }
952
ov2680_suspend(struct device * dev)953 static int __maybe_unused ov2680_suspend(struct device *dev)
954 {
955 struct v4l2_subdev *sd = dev_get_drvdata(dev);
956 struct ov2680_dev *sensor = to_ov2680_dev(sd);
957
958 if (sensor->is_streaming)
959 ov2680_stream_disable(sensor);
960
961 return 0;
962 }
963
ov2680_resume(struct device * dev)964 static int __maybe_unused ov2680_resume(struct device *dev)
965 {
966 struct v4l2_subdev *sd = dev_get_drvdata(dev);
967 struct ov2680_dev *sensor = to_ov2680_dev(sd);
968 int ret;
969
970 if (sensor->is_streaming) {
971 ret = ov2680_stream_enable(sensor);
972 if (ret < 0)
973 goto stream_disable;
974 }
975
976 return 0;
977
978 stream_disable:
979 ov2680_stream_disable(sensor);
980 sensor->is_streaming = false;
981
982 return ret;
983 }
984
985 static const struct dev_pm_ops ov2680_pm_ops = {
986 SET_SYSTEM_SLEEP_PM_OPS(ov2680_suspend, ov2680_resume)
987 };
988
989 static const struct of_device_id ov2680_dt_ids[] = {
990 { .compatible = "ovti,ov2680" },
991 { /* sentinel */ },
992 };
993 MODULE_DEVICE_TABLE(of, ov2680_dt_ids);
994
995 static struct i2c_driver ov2680_i2c_driver = {
996 .driver = {
997 .name = "ov2680",
998 .pm = &ov2680_pm_ops,
999 .of_match_table = of_match_ptr(ov2680_dt_ids),
1000 },
1001 .probe_new = ov2680_probe,
1002 .remove = ov2680_remove,
1003 };
1004 module_i2c_driver(ov2680_i2c_driver);
1005
1006 MODULE_AUTHOR("Rui Miguel Silva <rui.silva@linaro.org>");
1007 MODULE_DESCRIPTION("OV2680 CMOS Image Sensor driver");
1008 MODULE_LICENSE("GPL v2");
1009