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[sfrench/cifs-2.6.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
1500 static struct i2c_driver et8ek8_i2c_driver = {
1501         .driver         = {
1502                 .name   = ET8EK8_NAME,
1503                 .pm     = &et8ek8_pm_ops,
1504                 .of_match_table = et8ek8_of_table,
1505         },
1506         .probe          = et8ek8_probe,
1507         .remove         = __exit_p(et8ek8_remove),
1508         .id_table       = et8ek8_id_table,
1509 };
1510
1511 module_i2c_driver(et8ek8_i2c_driver);
1512
1513 MODULE_AUTHOR("Sakari Ailus <sakari.ailus@iki.fi>, Pavel Machek <pavel@ucw.cz");
1514 MODULE_DESCRIPTION("Toshiba ET8EK8 camera sensor driver");
1515 MODULE_LICENSE("GPL");