1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (c) 2020 MediaTek Inc.
3
4 #include <linux/clk.h>
5 #include <linux/delay.h>
6 #include <linux/device.h>
7 #include <linux/gpio/consumer.h>
8 #include <linux/i2c.h>
9 #include <linux/module.h>
10 #include <linux/pm_runtime.h>
11 #include <linux/regulator/consumer.h>
12 #include <linux/units.h>
13 #include <media/media-entity.h>
14 #include <media/v4l2-async.h>
15 #include <media/v4l2-ctrls.h>
16 #include <media/v4l2-fwnode.h>
17 #include <media/v4l2-subdev.h>
18
19 #define OV02A10_ID 0x2509
20 #define OV02A10_ID_MASK GENMASK(15, 0)
21
22 #define OV02A10_REG_CHIP_ID 0x02
23
24 /* Bit[1] vertical upside down */
25 /* Bit[0] horizontal mirror */
26 #define REG_MIRROR_FLIP_CONTROL 0x3f
27
28 /* Orientation */
29 #define REG_MIRROR_FLIP_ENABLE 0x03
30
31 /* Bit[2:0] MIPI transmission speed select */
32 #define TX_SPEED_AREA_SEL 0xa1
33 #define OV02A10_MIPI_TX_SPEED_DEFAULT 0x04
34
35 #define REG_PAGE_SWITCH 0xfd
36 #define REG_GLOBAL_EFFECTIVE 0x01
37 #define REG_ENABLE BIT(0)
38
39 #define REG_SC_CTRL_MODE 0xac
40 #define SC_CTRL_MODE_STANDBY 0x00
41 #define SC_CTRL_MODE_STREAMING 0x01
42
43 /* Exposure control */
44 #define OV02A10_EXP_SHIFT 8
45 #define OV02A10_REG_EXPOSURE_H 0x03
46 #define OV02A10_REG_EXPOSURE_L 0x04
47 #define OV02A10_EXPOSURE_MIN 4
48 #define OV02A10_EXPOSURE_MAX_MARGIN 4
49 #define OV02A10_EXPOSURE_STEP 1
50
51 /* Vblanking control */
52 #define OV02A10_VTS_SHIFT 8
53 #define OV02A10_REG_VTS_H 0x05
54 #define OV02A10_REG_VTS_L 0x06
55 #define OV02A10_VTS_MAX 0x209f
56 #define OV02A10_BASE_LINES 1224
57
58 /* Analog gain control */
59 #define OV02A10_REG_GAIN 0x24
60 #define OV02A10_GAIN_MIN 0x10
61 #define OV02A10_GAIN_MAX 0xf8
62 #define OV02A10_GAIN_STEP 0x01
63 #define OV02A10_GAIN_DEFAULT 0x40
64
65 /* Test pattern control */
66 #define OV02A10_REG_TEST_PATTERN 0xb6
67
68 #define OV02A10_LINK_FREQ_390MHZ (390 * HZ_PER_MHZ)
69 #define OV02A10_ECLK_FREQ (24 * HZ_PER_MHZ)
70
71 /* Number of lanes supported by this driver */
72 #define OV02A10_DATA_LANES 1
73
74 /* Bits per sample of sensor output */
75 #define OV02A10_BITS_PER_SAMPLE 10
76
77 static const char * const ov02a10_supply_names[] = {
78 "dovdd", /* Digital I/O power */
79 "avdd", /* Analog power */
80 "dvdd", /* Digital core power */
81 };
82
83 struct ov02a10_reg {
84 u8 addr;
85 u8 val;
86 };
87
88 struct ov02a10_reg_list {
89 u32 num_of_regs;
90 const struct ov02a10_reg *regs;
91 };
92
93 struct ov02a10_mode {
94 u32 width;
95 u32 height;
96 u32 exp_def;
97 u32 hts_def;
98 u32 vts_def;
99 const struct ov02a10_reg_list reg_list;
100 };
101
102 struct ov02a10 {
103 u32 eclk_freq;
104 /* Indication of MIPI transmission speed select */
105 u32 mipi_clock_voltage;
106
107 struct clk *eclk;
108 struct gpio_desc *pd_gpio;
109 struct gpio_desc *rst_gpio;
110 struct regulator_bulk_data supplies[ARRAY_SIZE(ov02a10_supply_names)];
111
112 bool streaming;
113 bool upside_down;
114
115 /*
116 * Serialize control access, get/set format, get selection
117 * and start streaming.
118 */
119 struct mutex mutex;
120 struct v4l2_subdev subdev;
121 struct media_pad pad;
122 struct v4l2_mbus_framefmt fmt;
123 struct v4l2_ctrl_handler ctrl_handler;
124 struct v4l2_ctrl *exposure;
125
126 const struct ov02a10_mode *cur_mode;
127 };
128
to_ov02a10(struct v4l2_subdev * sd)129 static inline struct ov02a10 *to_ov02a10(struct v4l2_subdev *sd)
130 {
131 return container_of(sd, struct ov02a10, subdev);
132 }
133
134 /*
135 * eclk 24Mhz
136 * pclk 39Mhz
137 * linelength 934(0x3a6)
138 * framelength 1390(0x56E)
139 * grabwindow_width 1600
140 * grabwindow_height 1200
141 * max_framerate 30fps
142 * mipi_datarate per lane 780Mbps
143 */
144 static const struct ov02a10_reg ov02a10_1600x1200_regs[] = {
145 {0xfd, 0x01},
146 {0xac, 0x00},
147 {0xfd, 0x00},
148 {0x2f, 0x29},
149 {0x34, 0x00},
150 {0x35, 0x21},
151 {0x30, 0x15},
152 {0x33, 0x01},
153 {0xfd, 0x01},
154 {0x44, 0x00},
155 {0x2a, 0x4c},
156 {0x2b, 0x1e},
157 {0x2c, 0x60},
158 {0x25, 0x11},
159 {0x03, 0x01},
160 {0x04, 0xae},
161 {0x09, 0x00},
162 {0x0a, 0x02},
163 {0x06, 0xa6},
164 {0x31, 0x00},
165 {0x24, 0x40},
166 {0x01, 0x01},
167 {0xfb, 0x73},
168 {0xfd, 0x01},
169 {0x16, 0x04},
170 {0x1c, 0x09},
171 {0x21, 0x42},
172 {0x12, 0x04},
173 {0x13, 0x10},
174 {0x11, 0x40},
175 {0x33, 0x81},
176 {0xd0, 0x00},
177 {0xd1, 0x01},
178 {0xd2, 0x00},
179 {0x50, 0x10},
180 {0x51, 0x23},
181 {0x52, 0x20},
182 {0x53, 0x10},
183 {0x54, 0x02},
184 {0x55, 0x20},
185 {0x56, 0x02},
186 {0x58, 0x48},
187 {0x5d, 0x15},
188 {0x5e, 0x05},
189 {0x66, 0x66},
190 {0x68, 0x68},
191 {0x6b, 0x00},
192 {0x6c, 0x00},
193 {0x6f, 0x40},
194 {0x70, 0x40},
195 {0x71, 0x0a},
196 {0x72, 0xf0},
197 {0x73, 0x10},
198 {0x75, 0x80},
199 {0x76, 0x10},
200 {0x84, 0x00},
201 {0x85, 0x10},
202 {0x86, 0x10},
203 {0x87, 0x00},
204 {0x8a, 0x22},
205 {0x8b, 0x22},
206 {0x19, 0xf1},
207 {0x29, 0x01},
208 {0xfd, 0x01},
209 {0x9d, 0x16},
210 {0xa0, 0x29},
211 {0xa1, 0x04},
212 {0xad, 0x62},
213 {0xae, 0x00},
214 {0xaf, 0x85},
215 {0xb1, 0x01},
216 {0x8e, 0x06},
217 {0x8f, 0x40},
218 {0x90, 0x04},
219 {0x91, 0xb0},
220 {0x45, 0x01},
221 {0x46, 0x00},
222 {0x47, 0x6c},
223 {0x48, 0x03},
224 {0x49, 0x8b},
225 {0x4a, 0x00},
226 {0x4b, 0x07},
227 {0x4c, 0x04},
228 {0x4d, 0xb7},
229 {0xf0, 0x40},
230 {0xf1, 0x40},
231 {0xf2, 0x40},
232 {0xf3, 0x40},
233 {0x3f, 0x00},
234 {0xfd, 0x01},
235 {0x05, 0x00},
236 {0x06, 0xa6},
237 {0xfd, 0x01},
238 };
239
240 static const char * const ov02a10_test_pattern_menu[] = {
241 "Disabled",
242 "Eight Vertical Colour Bars",
243 };
244
245 static const s64 link_freq_menu_items[] = {
246 OV02A10_LINK_FREQ_390MHZ,
247 };
248
to_pixel_rate(u32 f_index)249 static u64 to_pixel_rate(u32 f_index)
250 {
251 u64 pixel_rate = link_freq_menu_items[f_index] * 2 * OV02A10_DATA_LANES;
252
253 do_div(pixel_rate, OV02A10_BITS_PER_SAMPLE);
254
255 return pixel_rate;
256 }
257
258 static const struct ov02a10_mode supported_modes[] = {
259 {
260 .width = 1600,
261 .height = 1200,
262 .exp_def = 0x01ae,
263 .hts_def = 0x03a6,
264 .vts_def = 0x056e,
265 .reg_list = {
266 .num_of_regs = ARRAY_SIZE(ov02a10_1600x1200_regs),
267 .regs = ov02a10_1600x1200_regs,
268 },
269 },
270 };
271
ov02a10_write_array(struct ov02a10 * ov02a10,const struct ov02a10_reg_list * r_list)272 static int ov02a10_write_array(struct ov02a10 *ov02a10,
273 const struct ov02a10_reg_list *r_list)
274 {
275 struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
276 unsigned int i;
277 int ret;
278
279 for (i = 0; i < r_list->num_of_regs; i++) {
280 ret = i2c_smbus_write_byte_data(client, r_list->regs[i].addr,
281 r_list->regs[i].val);
282 if (ret < 0)
283 return ret;
284 }
285
286 return 0;
287 }
288
ov02a10_fill_fmt(const struct ov02a10_mode * mode,struct v4l2_mbus_framefmt * fmt)289 static void ov02a10_fill_fmt(const struct ov02a10_mode *mode,
290 struct v4l2_mbus_framefmt *fmt)
291 {
292 fmt->width = mode->width;
293 fmt->height = mode->height;
294 fmt->field = V4L2_FIELD_NONE;
295 }
296
ov02a10_set_fmt(struct v4l2_subdev * sd,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_format * fmt)297 static int ov02a10_set_fmt(struct v4l2_subdev *sd,
298 struct v4l2_subdev_state *sd_state,
299 struct v4l2_subdev_format *fmt)
300 {
301 struct ov02a10 *ov02a10 = to_ov02a10(sd);
302 struct v4l2_mbus_framefmt *mbus_fmt = &fmt->format;
303 struct v4l2_mbus_framefmt *frame_fmt;
304 int ret = 0;
305
306 mutex_lock(&ov02a10->mutex);
307
308 if (ov02a10->streaming && fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
309 ret = -EBUSY;
310 goto out_unlock;
311 }
312
313 /* Only one sensor mode supported */
314 mbus_fmt->code = ov02a10->fmt.code;
315 ov02a10_fill_fmt(ov02a10->cur_mode, mbus_fmt);
316
317 if (fmt->which == V4L2_SUBDEV_FORMAT_TRY)
318 frame_fmt = v4l2_subdev_get_try_format(sd, sd_state, 0);
319 else
320 frame_fmt = &ov02a10->fmt;
321
322 *frame_fmt = *mbus_fmt;
323
324 out_unlock:
325 mutex_unlock(&ov02a10->mutex);
326 return ret;
327 }
328
ov02a10_get_fmt(struct v4l2_subdev * sd,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_format * fmt)329 static int ov02a10_get_fmt(struct v4l2_subdev *sd,
330 struct v4l2_subdev_state *sd_state,
331 struct v4l2_subdev_format *fmt)
332 {
333 struct ov02a10 *ov02a10 = to_ov02a10(sd);
334 struct v4l2_mbus_framefmt *mbus_fmt = &fmt->format;
335
336 mutex_lock(&ov02a10->mutex);
337
338 if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
339 fmt->format = *v4l2_subdev_get_try_format(sd, sd_state,
340 fmt->pad);
341 } else {
342 fmt->format = ov02a10->fmt;
343 mbus_fmt->code = ov02a10->fmt.code;
344 ov02a10_fill_fmt(ov02a10->cur_mode, mbus_fmt);
345 }
346
347 mutex_unlock(&ov02a10->mutex);
348
349 return 0;
350 }
351
ov02a10_enum_mbus_code(struct v4l2_subdev * sd,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_mbus_code_enum * code)352 static int ov02a10_enum_mbus_code(struct v4l2_subdev *sd,
353 struct v4l2_subdev_state *sd_state,
354 struct v4l2_subdev_mbus_code_enum *code)
355 {
356 struct ov02a10 *ov02a10 = to_ov02a10(sd);
357
358 if (code->index != 0)
359 return -EINVAL;
360
361 code->code = ov02a10->fmt.code;
362
363 return 0;
364 }
365
ov02a10_enum_frame_sizes(struct v4l2_subdev * sd,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_frame_size_enum * fse)366 static int ov02a10_enum_frame_sizes(struct v4l2_subdev *sd,
367 struct v4l2_subdev_state *sd_state,
368 struct v4l2_subdev_frame_size_enum *fse)
369 {
370 if (fse->index >= ARRAY_SIZE(supported_modes))
371 return -EINVAL;
372
373 fse->min_width = supported_modes[fse->index].width;
374 fse->max_width = supported_modes[fse->index].width;
375 fse->max_height = supported_modes[fse->index].height;
376 fse->min_height = supported_modes[fse->index].height;
377
378 return 0;
379 }
380
ov02a10_check_sensor_id(struct ov02a10 * ov02a10)381 static int ov02a10_check_sensor_id(struct ov02a10 *ov02a10)
382 {
383 struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
384 u16 chip_id;
385 int ret;
386
387 /* Validate the chip ID */
388 ret = i2c_smbus_read_word_swapped(client, OV02A10_REG_CHIP_ID);
389 if (ret < 0)
390 return ret;
391
392 chip_id = le16_to_cpu((__force __le16)ret);
393
394 if ((chip_id & OV02A10_ID_MASK) != OV02A10_ID) {
395 dev_err(&client->dev, "unexpected sensor id(0x%04x)\n", chip_id);
396 return -EINVAL;
397 }
398
399 return 0;
400 }
401
ov02a10_power_on(struct device * dev)402 static int ov02a10_power_on(struct device *dev)
403 {
404 struct i2c_client *client = to_i2c_client(dev);
405 struct v4l2_subdev *sd = i2c_get_clientdata(client);
406 struct ov02a10 *ov02a10 = to_ov02a10(sd);
407 int ret;
408
409 gpiod_set_value_cansleep(ov02a10->rst_gpio, 1);
410 gpiod_set_value_cansleep(ov02a10->pd_gpio, 1);
411
412 ret = clk_prepare_enable(ov02a10->eclk);
413 if (ret < 0) {
414 dev_err(dev, "failed to enable eclk\n");
415 return ret;
416 }
417
418 ret = regulator_bulk_enable(ARRAY_SIZE(ov02a10_supply_names),
419 ov02a10->supplies);
420 if (ret < 0) {
421 dev_err(dev, "failed to enable regulators\n");
422 goto disable_clk;
423 }
424 usleep_range(5000, 6000);
425
426 gpiod_set_value_cansleep(ov02a10->pd_gpio, 0);
427 usleep_range(5000, 6000);
428
429 gpiod_set_value_cansleep(ov02a10->rst_gpio, 0);
430 usleep_range(5000, 6000);
431
432 ret = ov02a10_check_sensor_id(ov02a10);
433 if (ret)
434 goto disable_regulator;
435
436 return 0;
437
438 disable_regulator:
439 regulator_bulk_disable(ARRAY_SIZE(ov02a10_supply_names),
440 ov02a10->supplies);
441 disable_clk:
442 clk_disable_unprepare(ov02a10->eclk);
443
444 return ret;
445 }
446
ov02a10_power_off(struct device * dev)447 static int ov02a10_power_off(struct device *dev)
448 {
449 struct i2c_client *client = to_i2c_client(dev);
450 struct v4l2_subdev *sd = i2c_get_clientdata(client);
451 struct ov02a10 *ov02a10 = to_ov02a10(sd);
452
453 gpiod_set_value_cansleep(ov02a10->rst_gpio, 1);
454 clk_disable_unprepare(ov02a10->eclk);
455 gpiod_set_value_cansleep(ov02a10->pd_gpio, 1);
456 regulator_bulk_disable(ARRAY_SIZE(ov02a10_supply_names),
457 ov02a10->supplies);
458
459 return 0;
460 }
461
__ov02a10_start_stream(struct ov02a10 * ov02a10)462 static int __ov02a10_start_stream(struct ov02a10 *ov02a10)
463 {
464 struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
465 const struct ov02a10_reg_list *reg_list;
466 int ret;
467
468 /* Apply default values of current mode */
469 reg_list = &ov02a10->cur_mode->reg_list;
470 ret = ov02a10_write_array(ov02a10, reg_list);
471 if (ret)
472 return ret;
473
474 /* Apply customized values from user */
475 ret = __v4l2_ctrl_handler_setup(ov02a10->subdev.ctrl_handler);
476 if (ret)
477 return ret;
478
479 /* Set orientation to 180 degree */
480 if (ov02a10->upside_down) {
481 ret = i2c_smbus_write_byte_data(client, REG_MIRROR_FLIP_CONTROL,
482 REG_MIRROR_FLIP_ENABLE);
483 if (ret < 0) {
484 dev_err(&client->dev, "failed to set orientation\n");
485 return ret;
486 }
487 ret = i2c_smbus_write_byte_data(client, REG_GLOBAL_EFFECTIVE,
488 REG_ENABLE);
489 if (ret < 0)
490 return ret;
491 }
492
493 /* Set MIPI TX speed according to DT property */
494 if (ov02a10->mipi_clock_voltage != OV02A10_MIPI_TX_SPEED_DEFAULT) {
495 ret = i2c_smbus_write_byte_data(client, TX_SPEED_AREA_SEL,
496 ov02a10->mipi_clock_voltage);
497 if (ret < 0)
498 return ret;
499 }
500
501 /* Set stream on register */
502 return i2c_smbus_write_byte_data(client, REG_SC_CTRL_MODE,
503 SC_CTRL_MODE_STREAMING);
504 }
505
__ov02a10_stop_stream(struct ov02a10 * ov02a10)506 static int __ov02a10_stop_stream(struct ov02a10 *ov02a10)
507 {
508 struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
509
510 return i2c_smbus_write_byte_data(client, REG_SC_CTRL_MODE,
511 SC_CTRL_MODE_STANDBY);
512 }
513
ov02a10_entity_init_cfg(struct v4l2_subdev * sd,struct v4l2_subdev_state * sd_state)514 static int ov02a10_entity_init_cfg(struct v4l2_subdev *sd,
515 struct v4l2_subdev_state *sd_state)
516 {
517 struct v4l2_subdev_format fmt = {
518 .which = V4L2_SUBDEV_FORMAT_TRY,
519 .format = {
520 .width = 1600,
521 .height = 1200,
522 }
523 };
524
525 ov02a10_set_fmt(sd, sd_state, &fmt);
526
527 return 0;
528 }
529
ov02a10_s_stream(struct v4l2_subdev * sd,int on)530 static int ov02a10_s_stream(struct v4l2_subdev *sd, int on)
531 {
532 struct ov02a10 *ov02a10 = to_ov02a10(sd);
533 struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
534 int ret;
535
536 mutex_lock(&ov02a10->mutex);
537
538 if (ov02a10->streaming == on) {
539 ret = 0;
540 goto unlock_and_return;
541 }
542
543 if (on) {
544 ret = pm_runtime_resume_and_get(&client->dev);
545 if (ret < 0)
546 goto unlock_and_return;
547
548 ret = __ov02a10_start_stream(ov02a10);
549 if (ret) {
550 __ov02a10_stop_stream(ov02a10);
551 ov02a10->streaming = !on;
552 goto err_rpm_put;
553 }
554 } else {
555 __ov02a10_stop_stream(ov02a10);
556 pm_runtime_put(&client->dev);
557 }
558
559 ov02a10->streaming = on;
560 mutex_unlock(&ov02a10->mutex);
561
562 return 0;
563
564 err_rpm_put:
565 pm_runtime_put(&client->dev);
566 unlock_and_return:
567 mutex_unlock(&ov02a10->mutex);
568
569 return ret;
570 }
571
572 static const struct dev_pm_ops ov02a10_pm_ops = {
573 SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
574 pm_runtime_force_resume)
575 SET_RUNTIME_PM_OPS(ov02a10_power_off, ov02a10_power_on, NULL)
576 };
577
ov02a10_set_exposure(struct ov02a10 * ov02a10,int val)578 static int ov02a10_set_exposure(struct ov02a10 *ov02a10, int val)
579 {
580 struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
581 int ret;
582
583 ret = i2c_smbus_write_byte_data(client, REG_PAGE_SWITCH, REG_ENABLE);
584 if (ret < 0)
585 return ret;
586
587 ret = i2c_smbus_write_byte_data(client, OV02A10_REG_EXPOSURE_H,
588 val >> OV02A10_EXP_SHIFT);
589 if (ret < 0)
590 return ret;
591
592 ret = i2c_smbus_write_byte_data(client, OV02A10_REG_EXPOSURE_L, val);
593 if (ret < 0)
594 return ret;
595
596 return i2c_smbus_write_byte_data(client, REG_GLOBAL_EFFECTIVE,
597 REG_ENABLE);
598 }
599
ov02a10_set_gain(struct ov02a10 * ov02a10,int val)600 static int ov02a10_set_gain(struct ov02a10 *ov02a10, int val)
601 {
602 struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
603 int ret;
604
605 ret = i2c_smbus_write_byte_data(client, REG_PAGE_SWITCH, REG_ENABLE);
606 if (ret < 0)
607 return ret;
608
609 ret = i2c_smbus_write_byte_data(client, OV02A10_REG_GAIN, val);
610 if (ret < 0)
611 return ret;
612
613 return i2c_smbus_write_byte_data(client, REG_GLOBAL_EFFECTIVE,
614 REG_ENABLE);
615 }
616
ov02a10_set_vblank(struct ov02a10 * ov02a10,int val)617 static int ov02a10_set_vblank(struct ov02a10 *ov02a10, int val)
618 {
619 struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
620 u32 vts = val + ov02a10->cur_mode->height - OV02A10_BASE_LINES;
621 int ret;
622
623 ret = i2c_smbus_write_byte_data(client, REG_PAGE_SWITCH, REG_ENABLE);
624 if (ret < 0)
625 return ret;
626
627 ret = i2c_smbus_write_byte_data(client, OV02A10_REG_VTS_H,
628 vts >> OV02A10_VTS_SHIFT);
629 if (ret < 0)
630 return ret;
631
632 ret = i2c_smbus_write_byte_data(client, OV02A10_REG_VTS_L, vts);
633 if (ret < 0)
634 return ret;
635
636 return i2c_smbus_write_byte_data(client, REG_GLOBAL_EFFECTIVE,
637 REG_ENABLE);
638 }
639
ov02a10_set_test_pattern(struct ov02a10 * ov02a10,int pattern)640 static int ov02a10_set_test_pattern(struct ov02a10 *ov02a10, int pattern)
641 {
642 struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
643 int ret;
644
645 ret = i2c_smbus_write_byte_data(client, REG_PAGE_SWITCH, REG_ENABLE);
646 if (ret < 0)
647 return ret;
648
649 ret = i2c_smbus_write_byte_data(client, OV02A10_REG_TEST_PATTERN,
650 pattern);
651 if (ret < 0)
652 return ret;
653
654 ret = i2c_smbus_write_byte_data(client, REG_GLOBAL_EFFECTIVE,
655 REG_ENABLE);
656 if (ret < 0)
657 return ret;
658
659 return i2c_smbus_write_byte_data(client, REG_SC_CTRL_MODE,
660 SC_CTRL_MODE_STREAMING);
661 }
662
ov02a10_set_ctrl(struct v4l2_ctrl * ctrl)663 static int ov02a10_set_ctrl(struct v4l2_ctrl *ctrl)
664 {
665 struct ov02a10 *ov02a10 = container_of(ctrl->handler,
666 struct ov02a10, ctrl_handler);
667 struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
668 s64 max_expo;
669 int ret;
670
671 /* Propagate change of current control to all related controls */
672 if (ctrl->id == V4L2_CID_VBLANK) {
673 /* Update max exposure while meeting expected vblanking */
674 max_expo = ov02a10->cur_mode->height + ctrl->val -
675 OV02A10_EXPOSURE_MAX_MARGIN;
676 __v4l2_ctrl_modify_range(ov02a10->exposure,
677 ov02a10->exposure->minimum, max_expo,
678 ov02a10->exposure->step,
679 ov02a10->exposure->default_value);
680 }
681
682 /* V4L2 controls values will be applied only when power is already up */
683 if (!pm_runtime_get_if_in_use(&client->dev))
684 return 0;
685
686 switch (ctrl->id) {
687 case V4L2_CID_EXPOSURE:
688 ret = ov02a10_set_exposure(ov02a10, ctrl->val);
689 break;
690 case V4L2_CID_ANALOGUE_GAIN:
691 ret = ov02a10_set_gain(ov02a10, ctrl->val);
692 break;
693 case V4L2_CID_VBLANK:
694 ret = ov02a10_set_vblank(ov02a10, ctrl->val);
695 break;
696 case V4L2_CID_TEST_PATTERN:
697 ret = ov02a10_set_test_pattern(ov02a10, ctrl->val);
698 break;
699 default:
700 ret = -EINVAL;
701 break;
702 }
703
704 pm_runtime_put(&client->dev);
705
706 return ret;
707 }
708
709 static const struct v4l2_subdev_video_ops ov02a10_video_ops = {
710 .s_stream = ov02a10_s_stream,
711 };
712
713 static const struct v4l2_subdev_pad_ops ov02a10_pad_ops = {
714 .init_cfg = ov02a10_entity_init_cfg,
715 .enum_mbus_code = ov02a10_enum_mbus_code,
716 .enum_frame_size = ov02a10_enum_frame_sizes,
717 .get_fmt = ov02a10_get_fmt,
718 .set_fmt = ov02a10_set_fmt,
719 };
720
721 static const struct v4l2_subdev_ops ov02a10_subdev_ops = {
722 .video = &ov02a10_video_ops,
723 .pad = &ov02a10_pad_ops,
724 };
725
726 static const struct media_entity_operations ov02a10_subdev_entity_ops = {
727 .link_validate = v4l2_subdev_link_validate,
728 };
729
730 static const struct v4l2_ctrl_ops ov02a10_ctrl_ops = {
731 .s_ctrl = ov02a10_set_ctrl,
732 };
733
ov02a10_initialize_controls(struct ov02a10 * ov02a10)734 static int ov02a10_initialize_controls(struct ov02a10 *ov02a10)
735 {
736 struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
737 const struct ov02a10_mode *mode;
738 struct v4l2_ctrl_handler *handler;
739 struct v4l2_ctrl *ctrl;
740 s64 exposure_max;
741 s64 vblank_def;
742 s64 pixel_rate;
743 s64 h_blank;
744 int ret;
745
746 handler = &ov02a10->ctrl_handler;
747 mode = ov02a10->cur_mode;
748 ret = v4l2_ctrl_handler_init(handler, 7);
749 if (ret)
750 return ret;
751
752 handler->lock = &ov02a10->mutex;
753
754 ctrl = v4l2_ctrl_new_int_menu(handler, NULL, V4L2_CID_LINK_FREQ, 0, 0,
755 link_freq_menu_items);
756 if (ctrl)
757 ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
758
759 pixel_rate = to_pixel_rate(0);
760 v4l2_ctrl_new_std(handler, NULL, V4L2_CID_PIXEL_RATE, 0, pixel_rate, 1,
761 pixel_rate);
762
763 h_blank = mode->hts_def - mode->width;
764 v4l2_ctrl_new_std(handler, NULL, V4L2_CID_HBLANK, h_blank, h_blank, 1,
765 h_blank);
766
767 vblank_def = mode->vts_def - mode->height;
768 v4l2_ctrl_new_std(handler, &ov02a10_ctrl_ops, V4L2_CID_VBLANK,
769 vblank_def, OV02A10_VTS_MAX - mode->height, 1,
770 vblank_def);
771
772 exposure_max = mode->vts_def - 4;
773 ov02a10->exposure = v4l2_ctrl_new_std(handler, &ov02a10_ctrl_ops,
774 V4L2_CID_EXPOSURE,
775 OV02A10_EXPOSURE_MIN,
776 exposure_max,
777 OV02A10_EXPOSURE_STEP,
778 mode->exp_def);
779
780 v4l2_ctrl_new_std(handler, &ov02a10_ctrl_ops,
781 V4L2_CID_ANALOGUE_GAIN, OV02A10_GAIN_MIN,
782 OV02A10_GAIN_MAX, OV02A10_GAIN_STEP,
783 OV02A10_GAIN_DEFAULT);
784
785 v4l2_ctrl_new_std_menu_items(handler, &ov02a10_ctrl_ops,
786 V4L2_CID_TEST_PATTERN,
787 ARRAY_SIZE(ov02a10_test_pattern_menu) - 1,
788 0, 0, ov02a10_test_pattern_menu);
789
790 if (handler->error) {
791 ret = handler->error;
792 dev_err(&client->dev, "failed to init controls(%d)\n", ret);
793 goto err_free_handler;
794 }
795
796 ov02a10->subdev.ctrl_handler = handler;
797
798 return 0;
799
800 err_free_handler:
801 v4l2_ctrl_handler_free(handler);
802
803 return ret;
804 }
805
ov02a10_check_hwcfg(struct device * dev,struct ov02a10 * ov02a10)806 static int ov02a10_check_hwcfg(struct device *dev, struct ov02a10 *ov02a10)
807 {
808 struct fwnode_handle *ep;
809 struct fwnode_handle *fwnode = dev_fwnode(dev);
810 struct v4l2_fwnode_endpoint bus_cfg = {
811 .bus_type = V4L2_MBUS_CSI2_DPHY,
812 };
813 unsigned int i, j;
814 u32 clk_volt;
815 int ret;
816
817 if (!fwnode)
818 return -EINVAL;
819
820 ep = fwnode_graph_get_next_endpoint(fwnode, NULL);
821 if (!ep)
822 return -ENXIO;
823
824 ret = v4l2_fwnode_endpoint_alloc_parse(ep, &bus_cfg);
825 fwnode_handle_put(ep);
826 if (ret)
827 return ret;
828
829 /* Optional indication of MIPI clock voltage unit */
830 ret = fwnode_property_read_u32(ep, "ovti,mipi-clock-voltage",
831 &clk_volt);
832
833 if (!ret)
834 ov02a10->mipi_clock_voltage = clk_volt;
835
836 for (i = 0; i < ARRAY_SIZE(link_freq_menu_items); i++) {
837 for (j = 0; j < bus_cfg.nr_of_link_frequencies; j++) {
838 if (link_freq_menu_items[i] ==
839 bus_cfg.link_frequencies[j])
840 break;
841 }
842
843 if (j == bus_cfg.nr_of_link_frequencies) {
844 dev_err(dev, "no link frequency %lld supported\n",
845 link_freq_menu_items[i]);
846 ret = -EINVAL;
847 break;
848 }
849 }
850
851 v4l2_fwnode_endpoint_free(&bus_cfg);
852
853 return ret;
854 }
855
ov02a10_probe(struct i2c_client * client)856 static int ov02a10_probe(struct i2c_client *client)
857 {
858 struct device *dev = &client->dev;
859 struct ov02a10 *ov02a10;
860 unsigned int i;
861 unsigned int rotation;
862 int ret;
863
864 ov02a10 = devm_kzalloc(dev, sizeof(*ov02a10), GFP_KERNEL);
865 if (!ov02a10)
866 return -ENOMEM;
867
868 ret = ov02a10_check_hwcfg(dev, ov02a10);
869 if (ret)
870 return dev_err_probe(dev, ret,
871 "failed to check HW configuration\n");
872
873 v4l2_i2c_subdev_init(&ov02a10->subdev, client, &ov02a10_subdev_ops);
874
875 ov02a10->mipi_clock_voltage = OV02A10_MIPI_TX_SPEED_DEFAULT;
876 ov02a10->fmt.code = MEDIA_BUS_FMT_SBGGR10_1X10;
877
878 /* Optional indication of physical rotation of sensor */
879 rotation = 0;
880 device_property_read_u32(dev, "rotation", &rotation);
881 if (rotation == 180) {
882 ov02a10->upside_down = true;
883 ov02a10->fmt.code = MEDIA_BUS_FMT_SRGGB10_1X10;
884 }
885
886 ov02a10->eclk = devm_clk_get(dev, "eclk");
887 if (IS_ERR(ov02a10->eclk))
888 return dev_err_probe(dev, PTR_ERR(ov02a10->eclk),
889 "failed to get eclk\n");
890
891 ret = device_property_read_u32(dev, "clock-frequency",
892 &ov02a10->eclk_freq);
893 if (ret < 0)
894 return dev_err_probe(dev, ret,
895 "failed to get eclk frequency\n");
896
897 ret = clk_set_rate(ov02a10->eclk, ov02a10->eclk_freq);
898 if (ret < 0)
899 return dev_err_probe(dev, ret,
900 "failed to set eclk frequency (24MHz)\n");
901
902 if (clk_get_rate(ov02a10->eclk) != OV02A10_ECLK_FREQ)
903 dev_warn(dev, "eclk mismatched, mode is based on 24MHz\n");
904
905 ov02a10->pd_gpio = devm_gpiod_get(dev, "powerdown", GPIOD_OUT_HIGH);
906 if (IS_ERR(ov02a10->pd_gpio))
907 return dev_err_probe(dev, PTR_ERR(ov02a10->pd_gpio),
908 "failed to get powerdown-gpios\n");
909
910 ov02a10->rst_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
911 if (IS_ERR(ov02a10->rst_gpio))
912 return dev_err_probe(dev, PTR_ERR(ov02a10->rst_gpio),
913 "failed to get reset-gpios\n");
914
915 for (i = 0; i < ARRAY_SIZE(ov02a10_supply_names); i++)
916 ov02a10->supplies[i].supply = ov02a10_supply_names[i];
917
918 ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ov02a10_supply_names),
919 ov02a10->supplies);
920 if (ret)
921 return dev_err_probe(dev, ret, "failed to get regulators\n");
922
923 mutex_init(&ov02a10->mutex);
924
925 /* Set default mode */
926 ov02a10->cur_mode = &supported_modes[0];
927
928 ret = ov02a10_initialize_controls(ov02a10);
929 if (ret) {
930 dev_err_probe(dev, ret, "failed to initialize controls\n");
931 goto err_destroy_mutex;
932 }
933
934 /* Initialize subdev */
935 ov02a10->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
936 ov02a10->subdev.entity.ops = &ov02a10_subdev_entity_ops;
937 ov02a10->subdev.entity.function = MEDIA_ENT_F_CAM_SENSOR;
938 ov02a10->pad.flags = MEDIA_PAD_FL_SOURCE;
939
940 ret = media_entity_pads_init(&ov02a10->subdev.entity, 1, &ov02a10->pad);
941 if (ret < 0) {
942 dev_err_probe(dev, ret, "failed to initialize entity pads\n");
943 goto err_free_handler;
944 }
945
946 pm_runtime_enable(dev);
947 if (!pm_runtime_enabled(dev)) {
948 ret = ov02a10_power_on(dev);
949 if (ret < 0) {
950 dev_err_probe(dev, ret, "failed to power on\n");
951 goto err_clean_entity;
952 }
953 }
954
955 ret = v4l2_async_register_subdev(&ov02a10->subdev);
956 if (ret) {
957 dev_err_probe(dev, ret, "failed to register V4L2 subdev\n");
958 goto err_power_off;
959 }
960
961 return 0;
962
963 err_power_off:
964 if (pm_runtime_enabled(dev))
965 pm_runtime_disable(dev);
966 else
967 ov02a10_power_off(dev);
968 err_clean_entity:
969 media_entity_cleanup(&ov02a10->subdev.entity);
970 err_free_handler:
971 v4l2_ctrl_handler_free(ov02a10->subdev.ctrl_handler);
972 err_destroy_mutex:
973 mutex_destroy(&ov02a10->mutex);
974
975 return ret;
976 }
977
ov02a10_remove(struct i2c_client * client)978 static void ov02a10_remove(struct i2c_client *client)
979 {
980 struct v4l2_subdev *sd = i2c_get_clientdata(client);
981 struct ov02a10 *ov02a10 = to_ov02a10(sd);
982
983 v4l2_async_unregister_subdev(sd);
984 media_entity_cleanup(&sd->entity);
985 v4l2_ctrl_handler_free(sd->ctrl_handler);
986 pm_runtime_disable(&client->dev);
987 if (!pm_runtime_status_suspended(&client->dev))
988 ov02a10_power_off(&client->dev);
989 pm_runtime_set_suspended(&client->dev);
990 mutex_destroy(&ov02a10->mutex);
991 }
992
993 static const struct of_device_id ov02a10_of_match[] = {
994 { .compatible = "ovti,ov02a10" },
995 {}
996 };
997 MODULE_DEVICE_TABLE(of, ov02a10_of_match);
998
999 static struct i2c_driver ov02a10_i2c_driver = {
1000 .driver = {
1001 .name = "ov02a10",
1002 .pm = &ov02a10_pm_ops,
1003 .of_match_table = ov02a10_of_match,
1004 },
1005 .probe = ov02a10_probe,
1006 .remove = ov02a10_remove,
1007 };
1008 module_i2c_driver(ov02a10_i2c_driver);
1009
1010 MODULE_AUTHOR("Dongchun Zhu <dongchun.zhu@mediatek.com>");
1011 MODULE_DESCRIPTION("OmniVision OV02A10 sensor driver");
1012 MODULE_LICENSE("GPL v2");
1013