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[mirror_ubuntu-artful-kernel.git] / drivers / media / i2c / et8ek8 / et8ek8_driver.c
1 /*
2 * et8ek8_driver.c
3 *
4 * Copyright (C) 2008 Nokia Corporation
5 *
6 * Contact: Sakari Ailus <sakari.ailus@iki.fi>
7 * Tuukka Toivonen <tuukkat76@gmail.com>
8 * Pavel Machek <pavel@ucw.cz>
9 *
10 * Based on code from Toni Leinonen <toni.leinonen@offcode.fi>.
11 *
12 * This driver is based on the Micron MT9T012 camera imager driver
13 * (C) Texas Instruments.
14 *
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License
17 * version 2 as published by the Free Software Foundation.
18 *
19 * This program is distributed in the hope that it will be useful, but
20 * WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
22 * General Public License for more details.
23 */
24
25 #include <linux/clk.h>
26 #include <linux/delay.h>
27 #include <linux/gpio/consumer.h>
28 #include <linux/i2c.h>
29 #include <linux/kernel.h>
30 #include <linux/module.h>
31 #include <linux/mutex.h>
32 #include <linux/regulator/consumer.h>
33 #include <linux/slab.h>
34 #include <linux/sort.h>
35 #include <linux/v4l2-mediabus.h>
36
37 #include <media/media-entity.h>
38 #include <media/v4l2-ctrls.h>
39 #include <media/v4l2-device.h>
40 #include <media/v4l2-subdev.h>
41
42 #include "et8ek8_reg.h"
43
44 #define ET8EK8_NAME "et8ek8"
45 #define ET8EK8_PRIV_MEM_SIZE 128
46 #define ET8EK8_MAX_MSG 48
47
48 struct et8ek8_sensor {
49 struct v4l2_subdev subdev;
50 struct media_pad pad;
51 struct v4l2_mbus_framefmt format;
52 struct gpio_desc *reset;
53 struct regulator *vana;
54 struct clk *ext_clk;
55 u32 xclk_freq;
56
57 u16 version;
58
59 struct v4l2_ctrl_handler ctrl_handler;
60 struct v4l2_ctrl *exposure;
61 struct v4l2_ctrl *pixel_rate;
62 struct et8ek8_reglist *current_reglist;
63
64 u8 priv_mem[ET8EK8_PRIV_MEM_SIZE];
65
66 struct mutex power_lock;
67 int power_count;
68 };
69
70 #define to_et8ek8_sensor(sd) container_of(sd, struct et8ek8_sensor, subdev)
71
72 enum et8ek8_versions {
73 ET8EK8_REV_1 = 0x0001,
74 ET8EK8_REV_2,
75 };
76
77 /*
78 * This table describes what should be written to the sensor register
79 * for each gain value. The gain(index in the table) is in terms of
80 * 0.1EV, i.e. 10 indexes in the table give 2 time more gain [0] in
81 * the *analog gain, [1] in the digital gain
82 *
83 * Analog gain [dB] = 20*log10(regvalue/32); 0x20..0x100
84 */
85 static struct et8ek8_gain {
86 u16 analog;
87 u16 digital;
88 } const et8ek8_gain_table[] = {
89 { 32, 0}, /* x1 */
90 { 34, 0},
91 { 37, 0},
92 { 39, 0},
93 { 42, 0},
94 { 45, 0},
95 { 49, 0},
96 { 52, 0},
97 { 56, 0},
98 { 60, 0},
99 { 64, 0}, /* x2 */
100 { 69, 0},
101 { 74, 0},
102 { 79, 0},
103 { 84, 0},
104 { 91, 0},
105 { 97, 0},
106 {104, 0},
107 {111, 0},
108 {119, 0},
109 {128, 0}, /* x4 */
110 {137, 0},
111 {147, 0},
112 {158, 0},
113 {169, 0},
114 {181, 0},
115 {194, 0},
116 {208, 0},
117 {223, 0},
118 {239, 0},
119 {256, 0}, /* x8 */
120 {256, 73},
121 {256, 152},
122 {256, 236},
123 {256, 327},
124 {256, 424},
125 {256, 528},
126 {256, 639},
127 {256, 758},
128 {256, 886},
129 {256, 1023}, /* x16 */
130 };
131
132 /* Register definitions */
133 #define REG_REVISION_NUMBER_L 0x1200
134 #define REG_REVISION_NUMBER_H 0x1201
135
136 #define PRIV_MEM_START_REG 0x0008
137 #define PRIV_MEM_WIN_SIZE 8
138
139 #define ET8EK8_I2C_DELAY 3 /* msec delay b/w accesses */
140
141 #define USE_CRC 1
142
143 /*
144 * Register access helpers
145 *
146 * Read a 8/16/32-bit i2c register. The value is returned in 'val'.
147 * Returns zero if successful, or non-zero otherwise.
148 */
149 static int et8ek8_i2c_read_reg(struct i2c_client *client, u16 data_length,
150 u16 reg, u32 *val)
151 {
152 int r;
153 struct i2c_msg msg;
154 unsigned char data[4];
155
156 if (!client->adapter)
157 return -ENODEV;
158 if (data_length != ET8EK8_REG_8BIT && data_length != ET8EK8_REG_16BIT)
159 return -EINVAL;
160
161 msg.addr = client->addr;
162 msg.flags = 0;
163 msg.len = 2;
164 msg.buf = data;
165
166 /* high byte goes out first */
167 data[0] = (u8) (reg >> 8);
168 data[1] = (u8) (reg & 0xff);
169 r = i2c_transfer(client->adapter, &msg, 1);
170 if (r < 0)
171 goto err;
172
173 msg.len = data_length;
174 msg.flags = I2C_M_RD;
175 r = i2c_transfer(client->adapter, &msg, 1);
176 if (r < 0)
177 goto err;
178
179 *val = 0;
180 /* high byte comes first */
181 if (data_length == ET8EK8_REG_8BIT)
182 *val = data[0];
183 else
184 *val = (data[1] << 8) + data[0];
185
186 return 0;
187
188 err:
189 dev_err(&client->dev, "read from offset 0x%x error %d\n", reg, r);
190
191 return r;
192 }
193
194 static void et8ek8_i2c_create_msg(struct i2c_client *client, u16 len, u16 reg,
195 u32 val, struct i2c_msg *msg,
196 unsigned char *buf)
197 {
198 msg->addr = client->addr;
199 msg->flags = 0; /* Write */
200 msg->len = 2 + len;
201 msg->buf = buf;
202
203 /* high byte goes out first */
204 buf[0] = (u8) (reg >> 8);
205 buf[1] = (u8) (reg & 0xff);
206
207 switch (len) {
208 case ET8EK8_REG_8BIT:
209 buf[2] = (u8) (val) & 0xff;
210 break;
211 case ET8EK8_REG_16BIT:
212 buf[2] = (u8) (val) & 0xff;
213 buf[3] = (u8) (val >> 8) & 0xff;
214 break;
215 default:
216 WARN_ONCE(1, ET8EK8_NAME ": %s: invalid message length.\n",
217 __func__);
218 }
219 }
220
221 /*
222 * A buffered write method that puts the wanted register write
223 * commands in a message list and passes the list to the i2c framework
224 */
225 static int et8ek8_i2c_buffered_write_regs(struct i2c_client *client,
226 const struct et8ek8_reg *wnext,
227 int cnt)
228 {
229 struct i2c_msg msg[ET8EK8_MAX_MSG];
230 unsigned char data[ET8EK8_MAX_MSG][6];
231 int wcnt = 0;
232 u16 reg, data_length;
233 u32 val;
234
235 if (WARN_ONCE(cnt > ET8EK8_MAX_MSG,
236 ET8EK8_NAME ": %s: too many messages.\n", __func__)) {
237 return -EINVAL;
238 }
239
240 /* Create new write messages for all writes */
241 while (wcnt < cnt) {
242 data_length = wnext->type;
243 reg = wnext->reg;
244 val = wnext->val;
245 wnext++;
246
247 et8ek8_i2c_create_msg(client, data_length, reg,
248 val, &msg[wcnt], &data[wcnt][0]);
249
250 /* Update write count */
251 wcnt++;
252 }
253
254 /* Now we send everything ... */
255 return i2c_transfer(client->adapter, msg, wcnt);
256 }
257
258 /*
259 * Write a list of registers to i2c device.
260 *
261 * The list of registers is terminated by ET8EK8_REG_TERM.
262 * Returns zero if successful, or non-zero otherwise.
263 */
264 static int et8ek8_i2c_write_regs(struct i2c_client *client,
265 const struct et8ek8_reg *regs)
266 {
267 int r, cnt = 0;
268 const struct et8ek8_reg *next;
269
270 if (!client->adapter)
271 return -ENODEV;
272
273 if (!regs)
274 return -EINVAL;
275
276 /* Initialize list pointers to the start of the list */
277 next = regs;
278
279 do {
280 /*
281 * We have to go through the list to figure out how
282 * many regular writes we have in a row
283 */
284 while (next->type != ET8EK8_REG_TERM &&
285 next->type != ET8EK8_REG_DELAY) {
286 /*
287 * Here we check that the actual length fields
288 * are valid
289 */
290 if (WARN(next->type != ET8EK8_REG_8BIT &&
291 next->type != ET8EK8_REG_16BIT,
292 "Invalid type = %d", next->type)) {
293 return -EINVAL;
294 }
295 /*
296 * Increment count of successive writes and
297 * read pointer
298 */
299 cnt++;
300 next++;
301 }
302
303 /* Now we start writing ... */
304 r = et8ek8_i2c_buffered_write_regs(client, regs, cnt);
305
306 /* ... and then check that everything was OK */
307 if (r < 0) {
308 dev_err(&client->dev, "i2c transfer error!\n");
309 return r;
310 }
311
312 /*
313 * If we ran into a sleep statement when going through
314 * the list, this is where we snooze for the required time
315 */
316 if (next->type == ET8EK8_REG_DELAY) {
317 msleep(next->val);
318 /*
319 * ZZZ ...
320 * Update list pointers and cnt and start over ...
321 */
322 next++;
323 regs = next;
324 cnt = 0;
325 }
326 } while (next->type != ET8EK8_REG_TERM);
327
328 return 0;
329 }
330
331 /*
332 * Write to a 8/16-bit register.
333 * Returns zero if successful, or non-zero otherwise.
334 */
335 static int et8ek8_i2c_write_reg(struct i2c_client *client, u16 data_length,
336 u16 reg, u32 val)
337 {
338 int r;
339 struct i2c_msg msg;
340 unsigned char data[6];
341
342 if (!client->adapter)
343 return -ENODEV;
344 if (data_length != ET8EK8_REG_8BIT && data_length != ET8EK8_REG_16BIT)
345 return -EINVAL;
346
347 et8ek8_i2c_create_msg(client, data_length, reg, val, &msg, data);
348
349 r = i2c_transfer(client->adapter, &msg, 1);
350 if (r < 0) {
351 dev_err(&client->dev,
352 "wrote 0x%x to offset 0x%x error %d\n", val, reg, r);
353 return r;
354 }
355
356 return 0;
357 }
358
359 static struct et8ek8_reglist *et8ek8_reglist_find_type(
360 struct et8ek8_meta_reglist *meta,
361 u16 type)
362 {
363 struct et8ek8_reglist **next = &meta->reglist[0].ptr;
364
365 while (*next) {
366 if ((*next)->type == type)
367 return *next;
368
369 next++;
370 }
371
372 return NULL;
373 }
374
375 static int et8ek8_i2c_reglist_find_write(struct i2c_client *client,
376 struct et8ek8_meta_reglist *meta,
377 u16 type)
378 {
379 struct et8ek8_reglist *reglist;
380
381 reglist = et8ek8_reglist_find_type(meta, type);
382 if (!reglist)
383 return -EINVAL;
384
385 return et8ek8_i2c_write_regs(client, reglist->regs);
386 }
387
388 static struct et8ek8_reglist **et8ek8_reglist_first(
389 struct et8ek8_meta_reglist *meta)
390 {
391 return &meta->reglist[0].ptr;
392 }
393
394 static void et8ek8_reglist_to_mbus(const struct et8ek8_reglist *reglist,
395 struct v4l2_mbus_framefmt *fmt)
396 {
397 fmt->width = reglist->mode.window_width;
398 fmt->height = reglist->mode.window_height;
399 fmt->code = reglist->mode.bus_format;
400 }
401
402 static struct et8ek8_reglist *et8ek8_reglist_find_mode_fmt(
403 struct et8ek8_meta_reglist *meta,
404 struct v4l2_mbus_framefmt *fmt)
405 {
406 struct et8ek8_reglist **list = et8ek8_reglist_first(meta);
407 struct et8ek8_reglist *best_match = NULL;
408 struct et8ek8_reglist *best_other = NULL;
409 struct v4l2_mbus_framefmt format;
410 unsigned int max_dist_match = (unsigned int)-1;
411 unsigned int max_dist_other = (unsigned int)-1;
412
413 /*
414 * Find the mode with the closest image size. The distance between
415 * image sizes is the size in pixels of the non-overlapping regions
416 * between the requested size and the frame-specified size.
417 *
418 * Store both the closest mode that matches the requested format, and
419 * the closest mode for all other formats. The best match is returned
420 * if found, otherwise the best mode with a non-matching format is
421 * returned.
422 */
423 for (; *list; list++) {
424 unsigned int dist;
425
426 if ((*list)->type != ET8EK8_REGLIST_MODE)
427 continue;
428
429 et8ek8_reglist_to_mbus(*list, &format);
430
431 dist = min(fmt->width, format.width)
432 * min(fmt->height, format.height);
433 dist = format.width * format.height
434 + fmt->width * fmt->height - 2 * dist;
435
436
437 if (fmt->code == format.code) {
438 if (dist < max_dist_match || !best_match) {
439 best_match = *list;
440 max_dist_match = dist;
441 }
442 } else {
443 if (dist < max_dist_other || !best_other) {
444 best_other = *list;
445 max_dist_other = dist;
446 }
447 }
448 }
449
450 return best_match ? best_match : best_other;
451 }
452
453 #define TIMEPERFRAME_AVG_FPS(t) \
454 (((t).denominator + ((t).numerator >> 1)) / (t).numerator)
455
456 static struct et8ek8_reglist *et8ek8_reglist_find_mode_ival(
457 struct et8ek8_meta_reglist *meta,
458 struct et8ek8_reglist *current_reglist,
459 struct v4l2_fract *timeperframe)
460 {
461 int fps = TIMEPERFRAME_AVG_FPS(*timeperframe);
462 struct et8ek8_reglist **list = et8ek8_reglist_first(meta);
463 struct et8ek8_mode *current_mode = &current_reglist->mode;
464
465 for (; *list; list++) {
466 struct et8ek8_mode *mode = &(*list)->mode;
467
468 if ((*list)->type != ET8EK8_REGLIST_MODE)
469 continue;
470
471 if (mode->window_width != current_mode->window_width ||
472 mode->window_height != current_mode->window_height)
473 continue;
474
475 if (TIMEPERFRAME_AVG_FPS(mode->timeperframe) == fps)
476 return *list;
477 }
478
479 return NULL;
480 }
481
482 static int et8ek8_reglist_cmp(const void *a, const void *b)
483 {
484 const struct et8ek8_reglist **list1 = (const struct et8ek8_reglist **)a,
485 **list2 = (const struct et8ek8_reglist **)b;
486
487 /* Put real modes in the beginning. */
488 if ((*list1)->type == ET8EK8_REGLIST_MODE &&
489 (*list2)->type != ET8EK8_REGLIST_MODE)
490 return -1;
491 if ((*list1)->type != ET8EK8_REGLIST_MODE &&
492 (*list2)->type == ET8EK8_REGLIST_MODE)
493 return 1;
494
495 /* Descending width. */
496 if ((*list1)->mode.window_width > (*list2)->mode.window_width)
497 return -1;
498 if ((*list1)->mode.window_width < (*list2)->mode.window_width)
499 return 1;
500
501 if ((*list1)->mode.window_height > (*list2)->mode.window_height)
502 return -1;
503 if ((*list1)->mode.window_height < (*list2)->mode.window_height)
504 return 1;
505
506 return 0;
507 }
508
509 static int et8ek8_reglist_import(struct i2c_client *client,
510 struct et8ek8_meta_reglist *meta)
511 {
512 int nlists = 0, i;
513
514 dev_info(&client->dev, "meta_reglist version %s\n", meta->version);
515
516 while (meta->reglist[nlists].ptr)
517 nlists++;
518
519 if (!nlists)
520 return -EINVAL;
521
522 sort(&meta->reglist[0].ptr, nlists, sizeof(meta->reglist[0].ptr),
523 et8ek8_reglist_cmp, NULL);
524
525 i = nlists;
526 nlists = 0;
527
528 while (i--) {
529 struct et8ek8_reglist *list;
530
531 list = meta->reglist[nlists].ptr;
532
533 dev_dbg(&client->dev,
534 "%s: type %d\tw %d\th %d\tfmt %x\tival %d/%d\tptr %p\n",
535 __func__,
536 list->type,
537 list->mode.window_width, list->mode.window_height,
538 list->mode.bus_format,
539 list->mode.timeperframe.numerator,
540 list->mode.timeperframe.denominator,
541 (void *)meta->reglist[nlists].ptr);
542
543 nlists++;
544 }
545
546 return 0;
547 }
548
549 /* Called to change the V4L2 gain control value. This function
550 * rounds and clamps the given value and updates the V4L2 control value.
551 * If power is on, also updates the sensor analog and digital gains.
552 * gain is in 0.1 EV (exposure value) units.
553 */
554 static int et8ek8_set_gain(struct et8ek8_sensor *sensor, s32 gain)
555 {
556 struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
557 struct et8ek8_gain new;
558 int r;
559
560 new = et8ek8_gain_table[gain];
561
562 /* FIXME: optimise I2C writes! */
563 r = et8ek8_i2c_write_reg(client, ET8EK8_REG_8BIT,
564 0x124a, new.analog >> 8);
565 if (r)
566 return r;
567 r = et8ek8_i2c_write_reg(client, ET8EK8_REG_8BIT,
568 0x1249, new.analog & 0xff);
569 if (r)
570 return r;
571
572 r = et8ek8_i2c_write_reg(client, ET8EK8_REG_8BIT,
573 0x124d, new.digital >> 8);
574 if (r)
575 return r;
576 r = et8ek8_i2c_write_reg(client, ET8EK8_REG_8BIT,
577 0x124c, new.digital & 0xff);
578
579 return r;
580 }
581
582 static int et8ek8_set_test_pattern(struct et8ek8_sensor *sensor, s32 mode)
583 {
584 struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
585 int cbh_mode, cbv_mode, tp_mode, din_sw, r1420, rval;
586
587 /* Values for normal mode */
588 cbh_mode = 0;
589 cbv_mode = 0;
590 tp_mode = 0;
591 din_sw = 0x00;
592 r1420 = 0xF0;
593
594 if (mode) {
595 /* Test pattern mode */
596 if (mode < 5) {
597 cbh_mode = 1;
598 cbv_mode = 1;
599 tp_mode = mode + 3;
600 } else {
601 cbh_mode = 0;
602 cbv_mode = 0;
603 tp_mode = mode - 4 + 3;
604 }
605
606 din_sw = 0x01;
607 r1420 = 0xE0;
608 }
609
610 rval = et8ek8_i2c_write_reg(client, ET8EK8_REG_8BIT, 0x111B,
611 tp_mode << 4);
612 if (rval)
613 return rval;
614
615 rval = et8ek8_i2c_write_reg(client, ET8EK8_REG_8BIT, 0x1121,
616 cbh_mode << 7);
617 if (rval)
618 return rval;
619
620 rval = et8ek8_i2c_write_reg(client, ET8EK8_REG_8BIT, 0x1124,
621 cbv_mode << 7);
622 if (rval)
623 return rval;
624
625 rval = et8ek8_i2c_write_reg(client, ET8EK8_REG_8BIT, 0x112C, din_sw);
626 if (rval)
627 return rval;
628
629 return et8ek8_i2c_write_reg(client, ET8EK8_REG_8BIT, 0x1420, r1420);
630 }
631
632 /* -----------------------------------------------------------------------------
633 * V4L2 controls
634 */
635
636 static int et8ek8_set_ctrl(struct v4l2_ctrl *ctrl)
637 {
638 struct et8ek8_sensor *sensor =
639 container_of(ctrl->handler, struct et8ek8_sensor, ctrl_handler);
640
641 switch (ctrl->id) {
642 case V4L2_CID_GAIN:
643 return et8ek8_set_gain(sensor, ctrl->val);
644
645 case V4L2_CID_EXPOSURE:
646 {
647 struct i2c_client *client =
648 v4l2_get_subdevdata(&sensor->subdev);
649
650 return et8ek8_i2c_write_reg(client, ET8EK8_REG_16BIT, 0x1243,
651 ctrl->val);
652 }
653
654 case V4L2_CID_TEST_PATTERN:
655 return et8ek8_set_test_pattern(sensor, ctrl->val);
656
657 case V4L2_CID_PIXEL_RATE:
658 return 0;
659
660 default:
661 return -EINVAL;
662 }
663 }
664
665 static const struct v4l2_ctrl_ops et8ek8_ctrl_ops = {
666 .s_ctrl = et8ek8_set_ctrl,
667 };
668
669 static const char * const et8ek8_test_pattern_menu[] = {
670 "Normal",
671 "Vertical colorbar",
672 "Horizontal colorbar",
673 "Scale",
674 "Ramp",
675 "Small vertical colorbar",
676 "Small horizontal colorbar",
677 "Small scale",
678 "Small ramp",
679 };
680
681 static int et8ek8_init_controls(struct et8ek8_sensor *sensor)
682 {
683 s32 max_rows;
684
685 v4l2_ctrl_handler_init(&sensor->ctrl_handler, 4);
686
687 /* V4L2_CID_GAIN */
688 v4l2_ctrl_new_std(&sensor->ctrl_handler, &et8ek8_ctrl_ops,
689 V4L2_CID_GAIN, 0, ARRAY_SIZE(et8ek8_gain_table) - 1,
690 1, 0);
691
692 max_rows = sensor->current_reglist->mode.max_exp;
693 {
694 u32 min = 1, max = max_rows;
695
696 sensor->exposure =
697 v4l2_ctrl_new_std(&sensor->ctrl_handler,
698 &et8ek8_ctrl_ops, V4L2_CID_EXPOSURE,
699 min, max, min, max);
700 }
701
702 /* V4L2_CID_PIXEL_RATE */
703 sensor->pixel_rate =
704 v4l2_ctrl_new_std(&sensor->ctrl_handler, &et8ek8_ctrl_ops,
705 V4L2_CID_PIXEL_RATE, 1, INT_MAX, 1, 1);
706
707 /* V4L2_CID_TEST_PATTERN */
708 v4l2_ctrl_new_std_menu_items(&sensor->ctrl_handler,
709 &et8ek8_ctrl_ops, V4L2_CID_TEST_PATTERN,
710 ARRAY_SIZE(et8ek8_test_pattern_menu) - 1,
711 0, 0, et8ek8_test_pattern_menu);
712
713 if (sensor->ctrl_handler.error)
714 return sensor->ctrl_handler.error;
715
716 sensor->subdev.ctrl_handler = &sensor->ctrl_handler;
717
718 return 0;
719 }
720
721 static void et8ek8_update_controls(struct et8ek8_sensor *sensor)
722 {
723 struct v4l2_ctrl *ctrl;
724 struct et8ek8_mode *mode = &sensor->current_reglist->mode;
725
726 u32 min, max, pixel_rate;
727 static const int S = 8;
728
729 ctrl = sensor->exposure;
730
731 min = 1;
732 max = mode->max_exp;
733
734 /*
735 * Calculate average pixel clock per line. Assume buffers can spread
736 * the data over horizontal blanking time. Rounding upwards.
737 * Formula taken from stock Nokia N900 kernel.
738 */
739 pixel_rate = ((mode->pixel_clock + (1 << S) - 1) >> S) + mode->width;
740 pixel_rate = mode->window_width * (pixel_rate - 1) / mode->width;
741
742 __v4l2_ctrl_modify_range(ctrl, min, max, min, max);
743 __v4l2_ctrl_s_ctrl_int64(sensor->pixel_rate, pixel_rate << S);
744 }
745
746 static int et8ek8_configure(struct et8ek8_sensor *sensor)
747 {
748 struct v4l2_subdev *subdev = &sensor->subdev;
749 struct i2c_client *client = v4l2_get_subdevdata(subdev);
750 int rval;
751
752 rval = et8ek8_i2c_write_regs(client, sensor->current_reglist->regs);
753 if (rval)
754 goto fail;
755
756 /* Controls set while the power to the sensor is turned off are saved
757 * but not applied to the hardware. Now that we're about to start
758 * streaming apply all the current values to the hardware.
759 */
760 rval = v4l2_ctrl_handler_setup(&sensor->ctrl_handler);
761 if (rval)
762 goto fail;
763
764 return 0;
765
766 fail:
767 dev_err(&client->dev, "sensor configuration failed\n");
768
769 return rval;
770 }
771
772 static int et8ek8_stream_on(struct et8ek8_sensor *sensor)
773 {
774 struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
775
776 return et8ek8_i2c_write_reg(client, ET8EK8_REG_8BIT, 0x1252, 0xb0);
777 }
778
779 static int et8ek8_stream_off(struct et8ek8_sensor *sensor)
780 {
781 struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
782
783 return et8ek8_i2c_write_reg(client, ET8EK8_REG_8BIT, 0x1252, 0x30);
784 }
785
786 static int et8ek8_s_stream(struct v4l2_subdev *subdev, int streaming)
787 {
788 struct et8ek8_sensor *sensor = to_et8ek8_sensor(subdev);
789 int ret;
790
791 if (!streaming)
792 return et8ek8_stream_off(sensor);
793
794 ret = et8ek8_configure(sensor);
795 if (ret < 0)
796 return ret;
797
798 return et8ek8_stream_on(sensor);
799 }
800
801 /* --------------------------------------------------------------------------
802 * V4L2 subdev operations
803 */
804
805 static int et8ek8_power_off(struct et8ek8_sensor *sensor)
806 {
807 gpiod_set_value(sensor->reset, 0);
808 udelay(1);
809
810 clk_disable_unprepare(sensor->ext_clk);
811
812 return regulator_disable(sensor->vana);
813 }
814
815 static int et8ek8_power_on(struct et8ek8_sensor *sensor)
816 {
817 struct v4l2_subdev *subdev = &sensor->subdev;
818 struct i2c_client *client = v4l2_get_subdevdata(subdev);
819 unsigned int xclk_freq;
820 int val, rval;
821
822 rval = regulator_enable(sensor->vana);
823 if (rval) {
824 dev_err(&client->dev, "failed to enable vana regulator\n");
825 return rval;
826 }
827
828 if (sensor->current_reglist)
829 xclk_freq = sensor->current_reglist->mode.ext_clock;
830 else
831 xclk_freq = sensor->xclk_freq;
832
833 rval = clk_set_rate(sensor->ext_clk, xclk_freq);
834 if (rval < 0) {
835 dev_err(&client->dev, "unable to set extclk clock freq to %u\n",
836 xclk_freq);
837 goto out;
838 }
839 rval = clk_prepare_enable(sensor->ext_clk);
840 if (rval < 0) {
841 dev_err(&client->dev, "failed to enable extclk\n");
842 goto out;
843 }
844
845 if (rval)
846 goto out;
847
848 udelay(10); /* I wish this is a good value */
849
850 gpiod_set_value(sensor->reset, 1);
851
852 msleep(5000 * 1000 / xclk_freq + 1); /* Wait 5000 cycles */
853
854 rval = et8ek8_i2c_reglist_find_write(client, &meta_reglist,
855 ET8EK8_REGLIST_POWERON);
856 if (rval)
857 goto out;
858
859 #ifdef USE_CRC
860 rval = et8ek8_i2c_read_reg(client, ET8EK8_REG_8BIT, 0x1263, &val);
861 if (rval)
862 goto out;
863 #if USE_CRC /* TODO get crc setting from DT */
864 val |= BIT(4);
865 #else
866 val &= ~BIT(4);
867 #endif
868 rval = et8ek8_i2c_write_reg(client, ET8EK8_REG_8BIT, 0x1263, val);
869 if (rval)
870 goto out;
871 #endif
872
873 out:
874 if (rval)
875 et8ek8_power_off(sensor);
876
877 return rval;
878 }
879
880 /* --------------------------------------------------------------------------
881 * V4L2 subdev video operations
882 */
883 #define MAX_FMTS 4
884 static int et8ek8_enum_mbus_code(struct v4l2_subdev *subdev,
885 struct v4l2_subdev_pad_config *cfg,
886 struct v4l2_subdev_mbus_code_enum *code)
887 {
888 struct et8ek8_reglist **list =
889 et8ek8_reglist_first(&meta_reglist);
890 u32 pixelformat[MAX_FMTS];
891 int npixelformat = 0;
892
893 if (code->index >= MAX_FMTS)
894 return -EINVAL;
895
896 for (; *list; list++) {
897 struct et8ek8_mode *mode = &(*list)->mode;
898 int i;
899
900 if ((*list)->type != ET8EK8_REGLIST_MODE)
901 continue;
902
903 for (i = 0; i < npixelformat; i++) {
904 if (pixelformat[i] == mode->bus_format)
905 break;
906 }
907 if (i != npixelformat)
908 continue;
909
910 if (code->index == npixelformat) {
911 code->code = mode->bus_format;
912 return 0;
913 }
914
915 pixelformat[npixelformat] = mode->bus_format;
916 npixelformat++;
917 }
918
919 return -EINVAL;
920 }
921
922 static int et8ek8_enum_frame_size(struct v4l2_subdev *subdev,
923 struct v4l2_subdev_pad_config *cfg,
924 struct v4l2_subdev_frame_size_enum *fse)
925 {
926 struct et8ek8_reglist **list =
927 et8ek8_reglist_first(&meta_reglist);
928 struct v4l2_mbus_framefmt format;
929 int cmp_width = INT_MAX;
930 int cmp_height = INT_MAX;
931 int index = fse->index;
932
933 for (; *list; list++) {
934 if ((*list)->type != ET8EK8_REGLIST_MODE)
935 continue;
936
937 et8ek8_reglist_to_mbus(*list, &format);
938 if (fse->code != format.code)
939 continue;
940
941 /* Assume that the modes are grouped by frame size. */
942 if (format.width == cmp_width && format.height == cmp_height)
943 continue;
944
945 cmp_width = format.width;
946 cmp_height = format.height;
947
948 if (index-- == 0) {
949 fse->min_width = format.width;
950 fse->min_height = format.height;
951 fse->max_width = format.width;
952 fse->max_height = format.height;
953 return 0;
954 }
955 }
956
957 return -EINVAL;
958 }
959
960 static int et8ek8_enum_frame_ival(struct v4l2_subdev *subdev,
961 struct v4l2_subdev_pad_config *cfg,
962 struct v4l2_subdev_frame_interval_enum *fie)
963 {
964 struct et8ek8_reglist **list =
965 et8ek8_reglist_first(&meta_reglist);
966 struct v4l2_mbus_framefmt format;
967 int index = fie->index;
968
969 for (; *list; list++) {
970 struct et8ek8_mode *mode = &(*list)->mode;
971
972 if ((*list)->type != ET8EK8_REGLIST_MODE)
973 continue;
974
975 et8ek8_reglist_to_mbus(*list, &format);
976 if (fie->code != format.code)
977 continue;
978
979 if (fie->width != format.width || fie->height != format.height)
980 continue;
981
982 if (index-- == 0) {
983 fie->interval = mode->timeperframe;
984 return 0;
985 }
986 }
987
988 return -EINVAL;
989 }
990
991 static struct v4l2_mbus_framefmt *
992 __et8ek8_get_pad_format(struct et8ek8_sensor *sensor,
993 struct v4l2_subdev_pad_config *cfg,
994 unsigned int pad, enum v4l2_subdev_format_whence which)
995 {
996 switch (which) {
997 case V4L2_SUBDEV_FORMAT_TRY:
998 return v4l2_subdev_get_try_format(&sensor->subdev, cfg, pad);
999 case V4L2_SUBDEV_FORMAT_ACTIVE:
1000 return &sensor->format;
1001 default:
1002 return NULL;
1003 }
1004 }
1005
1006 static int et8ek8_get_pad_format(struct v4l2_subdev *subdev,
1007 struct v4l2_subdev_pad_config *cfg,
1008 struct v4l2_subdev_format *fmt)
1009 {
1010 struct et8ek8_sensor *sensor = to_et8ek8_sensor(subdev);
1011 struct v4l2_mbus_framefmt *format;
1012
1013 format = __et8ek8_get_pad_format(sensor, cfg, fmt->pad, fmt->which);
1014 if (!format)
1015 return -EINVAL;
1016
1017 fmt->format = *format;
1018
1019 return 0;
1020 }
1021
1022 static int et8ek8_set_pad_format(struct v4l2_subdev *subdev,
1023 struct v4l2_subdev_pad_config *cfg,
1024 struct v4l2_subdev_format *fmt)
1025 {
1026 struct et8ek8_sensor *sensor = to_et8ek8_sensor(subdev);
1027 struct v4l2_mbus_framefmt *format;
1028 struct et8ek8_reglist *reglist;
1029
1030 format = __et8ek8_get_pad_format(sensor, cfg, fmt->pad, fmt->which);
1031 if (!format)
1032 return -EINVAL;
1033
1034 reglist = et8ek8_reglist_find_mode_fmt(&meta_reglist, &fmt->format);
1035 et8ek8_reglist_to_mbus(reglist, &fmt->format);
1036 *format = fmt->format;
1037
1038 if (fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
1039 sensor->current_reglist = reglist;
1040 et8ek8_update_controls(sensor);
1041 }
1042
1043 return 0;
1044 }
1045
1046 static int et8ek8_get_frame_interval(struct v4l2_subdev *subdev,
1047 struct v4l2_subdev_frame_interval *fi)
1048 {
1049 struct et8ek8_sensor *sensor = to_et8ek8_sensor(subdev);
1050
1051 memset(fi, 0, sizeof(*fi));
1052 fi->interval = sensor->current_reglist->mode.timeperframe;
1053
1054 return 0;
1055 }
1056
1057 static int et8ek8_set_frame_interval(struct v4l2_subdev *subdev,
1058 struct v4l2_subdev_frame_interval *fi)
1059 {
1060 struct et8ek8_sensor *sensor = to_et8ek8_sensor(subdev);
1061 struct et8ek8_reglist *reglist;
1062
1063 reglist = et8ek8_reglist_find_mode_ival(&meta_reglist,
1064 sensor->current_reglist,
1065 &fi->interval);
1066
1067 if (!reglist)
1068 return -EINVAL;
1069
1070 if (sensor->current_reglist->mode.ext_clock != reglist->mode.ext_clock)
1071 return -EINVAL;
1072
1073 sensor->current_reglist = reglist;
1074 et8ek8_update_controls(sensor);
1075
1076 return 0;
1077 }
1078
1079 static int et8ek8_g_priv_mem(struct v4l2_subdev *subdev)
1080 {
1081 struct et8ek8_sensor *sensor = to_et8ek8_sensor(subdev);
1082 struct i2c_client *client = v4l2_get_subdevdata(subdev);
1083 unsigned int length = ET8EK8_PRIV_MEM_SIZE;
1084 unsigned int offset = 0;
1085 u8 *ptr = sensor->priv_mem;
1086 int rval = 0;
1087
1088 /* Read the EEPROM window-by-window, each window 8 bytes */
1089 do {
1090 u8 buffer[PRIV_MEM_WIN_SIZE];
1091 struct i2c_msg msg;
1092 int bytes, i;
1093 int ofs;
1094
1095 /* Set the current window */
1096 rval = et8ek8_i2c_write_reg(client, ET8EK8_REG_8BIT, 0x0001,
1097 0xe0 | (offset >> 3));
1098 if (rval < 0)
1099 return rval;
1100
1101 /* Wait for status bit */
1102 for (i = 0; i < 1000; ++i) {
1103 u32 status;
1104
1105 rval = et8ek8_i2c_read_reg(client, ET8EK8_REG_8BIT,
1106 0x0003, &status);
1107 if (rval < 0)
1108 return rval;
1109 if (!(status & 0x08))
1110 break;
1111 usleep_range(1000, 2000);
1112 }
1113
1114 if (i == 1000)
1115 return -EIO;
1116
1117 /* Read window, 8 bytes at once, and copy to user space */
1118 ofs = offset & 0x07; /* Offset within this window */
1119 bytes = length + ofs > 8 ? 8-ofs : length;
1120 msg.addr = client->addr;
1121 msg.flags = 0;
1122 msg.len = 2;
1123 msg.buf = buffer;
1124 ofs += PRIV_MEM_START_REG;
1125 buffer[0] = (u8)(ofs >> 8);
1126 buffer[1] = (u8)(ofs & 0xFF);
1127
1128 rval = i2c_transfer(client->adapter, &msg, 1);
1129 if (rval < 0)
1130 return rval;
1131
1132 mdelay(ET8EK8_I2C_DELAY);
1133 msg.addr = client->addr;
1134 msg.len = bytes;
1135 msg.flags = I2C_M_RD;
1136 msg.buf = buffer;
1137 memset(buffer, 0, sizeof(buffer));
1138
1139 rval = i2c_transfer(client->adapter, &msg, 1);
1140 if (rval < 0)
1141 return rval;
1142
1143 rval = 0;
1144 memcpy(ptr, buffer, bytes);
1145
1146 length -= bytes;
1147 offset += bytes;
1148 ptr += bytes;
1149 } while (length > 0);
1150
1151 return rval;
1152 }
1153
1154 static int et8ek8_dev_init(struct v4l2_subdev *subdev)
1155 {
1156 struct et8ek8_sensor *sensor = to_et8ek8_sensor(subdev);
1157 struct i2c_client *client = v4l2_get_subdevdata(subdev);
1158 int rval, rev_l, rev_h;
1159
1160 rval = et8ek8_power_on(sensor);
1161 if (rval) {
1162 dev_err(&client->dev, "could not power on\n");
1163 return rval;
1164 }
1165
1166 rval = et8ek8_i2c_read_reg(client, ET8EK8_REG_8BIT,
1167 REG_REVISION_NUMBER_L, &rev_l);
1168 if (!rval)
1169 rval = et8ek8_i2c_read_reg(client, ET8EK8_REG_8BIT,
1170 REG_REVISION_NUMBER_H, &rev_h);
1171 if (rval) {
1172 dev_err(&client->dev, "no et8ek8 sensor detected\n");
1173 goto out_poweroff;
1174 }
1175
1176 sensor->version = (rev_h << 8) + rev_l;
1177 if (sensor->version != ET8EK8_REV_1 && sensor->version != ET8EK8_REV_2)
1178 dev_info(&client->dev,
1179 "unknown version 0x%x detected, continuing anyway\n",
1180 sensor->version);
1181
1182 rval = et8ek8_reglist_import(client, &meta_reglist);
1183 if (rval) {
1184 dev_err(&client->dev,
1185 "invalid register list %s, import failed\n",
1186 ET8EK8_NAME);
1187 goto out_poweroff;
1188 }
1189
1190 sensor->current_reglist = et8ek8_reglist_find_type(&meta_reglist,
1191 ET8EK8_REGLIST_MODE);
1192 if (!sensor->current_reglist) {
1193 dev_err(&client->dev,
1194 "invalid register list %s, no mode found\n",
1195 ET8EK8_NAME);
1196 rval = -ENODEV;
1197 goto out_poweroff;
1198 }
1199
1200 et8ek8_reglist_to_mbus(sensor->current_reglist, &sensor->format);
1201
1202 rval = et8ek8_i2c_reglist_find_write(client, &meta_reglist,
1203 ET8EK8_REGLIST_POWERON);
1204 if (rval) {
1205 dev_err(&client->dev,
1206 "invalid register list %s, no POWERON mode found\n",
1207 ET8EK8_NAME);
1208 goto out_poweroff;
1209 }
1210 rval = et8ek8_stream_on(sensor); /* Needed to be able to read EEPROM */
1211 if (rval)
1212 goto out_poweroff;
1213 rval = et8ek8_g_priv_mem(subdev);
1214 if (rval)
1215 dev_warn(&client->dev,
1216 "can not read OTP (EEPROM) memory from sensor\n");
1217 rval = et8ek8_stream_off(sensor);
1218 if (rval)
1219 goto out_poweroff;
1220
1221 rval = et8ek8_power_off(sensor);
1222 if (rval)
1223 goto out_poweroff;
1224
1225 return 0;
1226
1227 out_poweroff:
1228 et8ek8_power_off(sensor);
1229
1230 return rval;
1231 }
1232
1233 /* --------------------------------------------------------------------------
1234 * sysfs attributes
1235 */
1236 static ssize_t
1237 et8ek8_priv_mem_read(struct device *dev, struct device_attribute *attr,
1238 char *buf)
1239 {
1240 struct v4l2_subdev *subdev = i2c_get_clientdata(to_i2c_client(dev));
1241 struct et8ek8_sensor *sensor = to_et8ek8_sensor(subdev);
1242
1243 #if PAGE_SIZE < ET8EK8_PRIV_MEM_SIZE
1244 #error PAGE_SIZE too small!
1245 #endif
1246
1247 memcpy(buf, sensor->priv_mem, ET8EK8_PRIV_MEM_SIZE);
1248
1249 return ET8EK8_PRIV_MEM_SIZE;
1250 }
1251 static DEVICE_ATTR(priv_mem, 0444, et8ek8_priv_mem_read, NULL);
1252
1253 /* --------------------------------------------------------------------------
1254 * V4L2 subdev core operations
1255 */
1256
1257 static int
1258 et8ek8_registered(struct v4l2_subdev *subdev)
1259 {
1260 struct et8ek8_sensor *sensor = to_et8ek8_sensor(subdev);
1261 struct i2c_client *client = v4l2_get_subdevdata(subdev);
1262 int rval;
1263
1264 dev_dbg(&client->dev, "registered!");
1265
1266 rval = device_create_file(&client->dev, &dev_attr_priv_mem);
1267 if (rval) {
1268 dev_err(&client->dev, "could not register sysfs entry\n");
1269 return rval;
1270 }
1271
1272 rval = et8ek8_dev_init(subdev);
1273 if (rval)
1274 goto err_file;
1275
1276 rval = et8ek8_init_controls(sensor);
1277 if (rval) {
1278 dev_err(&client->dev, "controls initialization failed\n");
1279 goto err_file;
1280 }
1281
1282 __et8ek8_get_pad_format(sensor, NULL, 0, V4L2_SUBDEV_FORMAT_ACTIVE);
1283
1284 return 0;
1285
1286 err_file:
1287 device_remove_file(&client->dev, &dev_attr_priv_mem);
1288
1289 return rval;
1290 }
1291
1292 static int __et8ek8_set_power(struct et8ek8_sensor *sensor, bool on)
1293 {
1294 return on ? et8ek8_power_on(sensor) : et8ek8_power_off(sensor);
1295 }
1296
1297 static int et8ek8_set_power(struct v4l2_subdev *subdev, int on)
1298 {
1299 struct et8ek8_sensor *sensor = to_et8ek8_sensor(subdev);
1300 int ret = 0;
1301
1302 mutex_lock(&sensor->power_lock);
1303
1304 /* If the power count is modified from 0 to != 0 or from != 0 to 0,
1305 * update the power state.
1306 */
1307 if (sensor->power_count == !on) {
1308 ret = __et8ek8_set_power(sensor, !!on);
1309 if (ret < 0)
1310 goto done;
1311 }
1312
1313 /* Update the power count. */
1314 sensor->power_count += on ? 1 : -1;
1315 WARN_ON(sensor->power_count < 0);
1316
1317 done:
1318 mutex_unlock(&sensor->power_lock);
1319
1320 return ret;
1321 }
1322
1323 static int et8ek8_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
1324 {
1325 struct et8ek8_sensor *sensor = to_et8ek8_sensor(sd);
1326 struct v4l2_mbus_framefmt *format;
1327 struct et8ek8_reglist *reglist;
1328
1329 reglist = et8ek8_reglist_find_type(&meta_reglist, ET8EK8_REGLIST_MODE);
1330 format = __et8ek8_get_pad_format(sensor, fh->pad, 0,
1331 V4L2_SUBDEV_FORMAT_TRY);
1332 et8ek8_reglist_to_mbus(reglist, format);
1333
1334 return et8ek8_set_power(sd, true);
1335 }
1336
1337 static int et8ek8_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
1338 {
1339 return et8ek8_set_power(sd, false);
1340 }
1341
1342 static const struct v4l2_subdev_video_ops et8ek8_video_ops = {
1343 .s_stream = et8ek8_s_stream,
1344 .g_frame_interval = et8ek8_get_frame_interval,
1345 .s_frame_interval = et8ek8_set_frame_interval,
1346 };
1347
1348 static const struct v4l2_subdev_core_ops et8ek8_core_ops = {
1349 .s_power = et8ek8_set_power,
1350 };
1351
1352 static const struct v4l2_subdev_pad_ops et8ek8_pad_ops = {
1353 .enum_mbus_code = et8ek8_enum_mbus_code,
1354 .enum_frame_size = et8ek8_enum_frame_size,
1355 .enum_frame_interval = et8ek8_enum_frame_ival,
1356 .get_fmt = et8ek8_get_pad_format,
1357 .set_fmt = et8ek8_set_pad_format,
1358 };
1359
1360 static const struct v4l2_subdev_ops et8ek8_ops = {
1361 .core = &et8ek8_core_ops,
1362 .video = &et8ek8_video_ops,
1363 .pad = &et8ek8_pad_ops,
1364 };
1365
1366 static const struct v4l2_subdev_internal_ops et8ek8_internal_ops = {
1367 .registered = et8ek8_registered,
1368 .open = et8ek8_open,
1369 .close = et8ek8_close,
1370 };
1371
1372 /* --------------------------------------------------------------------------
1373 * I2C driver
1374 */
1375 static int __maybe_unused et8ek8_suspend(struct device *dev)
1376 {
1377 struct i2c_client *client = to_i2c_client(dev);
1378 struct v4l2_subdev *subdev = i2c_get_clientdata(client);
1379 struct et8ek8_sensor *sensor = to_et8ek8_sensor(subdev);
1380
1381 if (!sensor->power_count)
1382 return 0;
1383
1384 return __et8ek8_set_power(sensor, false);
1385 }
1386
1387 static int __maybe_unused et8ek8_resume(struct device *dev)
1388 {
1389 struct i2c_client *client = to_i2c_client(dev);
1390 struct v4l2_subdev *subdev = i2c_get_clientdata(client);
1391 struct et8ek8_sensor *sensor = to_et8ek8_sensor(subdev);
1392
1393 if (!sensor->power_count)
1394 return 0;
1395
1396 return __et8ek8_set_power(sensor, true);
1397 }
1398
1399 static int et8ek8_probe(struct i2c_client *client,
1400 const struct i2c_device_id *devid)
1401 {
1402 struct et8ek8_sensor *sensor;
1403 struct device *dev = &client->dev;
1404 int ret;
1405
1406 sensor = devm_kzalloc(&client->dev, sizeof(*sensor), GFP_KERNEL);
1407 if (!sensor)
1408 return -ENOMEM;
1409
1410 sensor->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
1411 if (IS_ERR(sensor->reset)) {
1412 dev_dbg(&client->dev, "could not request reset gpio\n");
1413 return PTR_ERR(sensor->reset);
1414 }
1415
1416 sensor->vana = devm_regulator_get(dev, "vana");
1417 if (IS_ERR(sensor->vana)) {
1418 dev_err(&client->dev, "could not get regulator for vana\n");
1419 return PTR_ERR(sensor->vana);
1420 }
1421
1422 sensor->ext_clk = devm_clk_get(dev, NULL);
1423 if (IS_ERR(sensor->ext_clk)) {
1424 dev_err(&client->dev, "could not get clock\n");
1425 return PTR_ERR(sensor->ext_clk);
1426 }
1427
1428 ret = of_property_read_u32(dev->of_node, "clock-frequency",
1429 &sensor->xclk_freq);
1430 if (ret) {
1431 dev_warn(dev, "can't get clock-frequency\n");
1432 return ret;
1433 }
1434
1435 mutex_init(&sensor->power_lock);
1436
1437 v4l2_i2c_subdev_init(&sensor->subdev, client, &et8ek8_ops);
1438 sensor->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
1439 sensor->subdev.internal_ops = &et8ek8_internal_ops;
1440
1441 sensor->pad.flags = MEDIA_PAD_FL_SOURCE;
1442 ret = media_entity_pads_init(&sensor->subdev.entity, 1, &sensor->pad);
1443 if (ret < 0) {
1444 dev_err(&client->dev, "media entity init failed!\n");
1445 goto err_mutex;
1446 }
1447
1448 ret = v4l2_async_register_subdev(&sensor->subdev);
1449 if (ret < 0)
1450 goto err_entity;
1451
1452 dev_dbg(dev, "initialized!\n");
1453
1454 return 0;
1455
1456 err_entity:
1457 media_entity_cleanup(&sensor->subdev.entity);
1458 err_mutex:
1459 mutex_destroy(&sensor->power_lock);
1460 return ret;
1461 }
1462
1463 static int __exit et8ek8_remove(struct i2c_client *client)
1464 {
1465 struct v4l2_subdev *subdev = i2c_get_clientdata(client);
1466 struct et8ek8_sensor *sensor = to_et8ek8_sensor(subdev);
1467
1468 if (sensor->power_count) {
1469 WARN_ON(1);
1470 et8ek8_power_off(sensor);
1471 sensor->power_count = 0;
1472 }
1473
1474 v4l2_device_unregister_subdev(&sensor->subdev);
1475 device_remove_file(&client->dev, &dev_attr_priv_mem);
1476 v4l2_ctrl_handler_free(&sensor->ctrl_handler);
1477 v4l2_async_unregister_subdev(&sensor->subdev);
1478 media_entity_cleanup(&sensor->subdev.entity);
1479 mutex_destroy(&sensor->power_lock);
1480
1481 return 0;
1482 }
1483
1484 static const struct of_device_id et8ek8_of_table[] = {
1485 { .compatible = "toshiba,et8ek8" },
1486 { },
1487 };
1488 MODULE_DEVICE_TABLE(of, et8ek8_of_table);
1489
1490 static const struct i2c_device_id et8ek8_id_table[] = {
1491 { ET8EK8_NAME, 0 },
1492 { }
1493 };
1494 MODULE_DEVICE_TABLE(i2c, et8ek8_id_table);
1495
1496 static const struct dev_pm_ops et8ek8_pm_ops = {
1497 SET_SYSTEM_SLEEP_PM_OPS(et8ek8_suspend, et8ek8_resume)
1498 };
1499 MODULE_DEVICE_TABLE(of, et8ek8_of_table);
1500
1501 static struct i2c_driver et8ek8_i2c_driver = {
1502 .driver = {
1503 .name = ET8EK8_NAME,
1504 .pm = &et8ek8_pm_ops,
1505 .of_match_table = et8ek8_of_table,
1506 },
1507 .probe = et8ek8_probe,
1508 .remove = __exit_p(et8ek8_remove),
1509 .id_table = et8ek8_id_table,
1510 };
1511
1512 module_i2c_driver(et8ek8_i2c_driver);
1513
1514 MODULE_AUTHOR("Sakari Ailus <sakari.ailus@iki.fi>, Pavel Machek <pavel@ucw.cz");
1515 MODULE_DESCRIPTION("Toshiba ET8EK8 camera sensor driver");
1516 MODULE_LICENSE("GPL");
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