drivers/media/i2c/et8ek8/et8ek8_driver.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * et8ek8_driver.c
   4  *
   5  * Copyright (C) 2008 Nokia Corporation
   6  *
   7  * Contact: Sakari Ailus <sakari.ailus@iki.fi>
   8  *          Tuukka Toivonen <tuukkat76@gmail.com>
   9  *          Pavel Machek <pavel@ucw.cz>
  10  *
  11  * Based on code from Toni Leinonen <toni.leinonen@offcode.fi>.
  12  *
  13  * This driver is based on the Micron MT9T012 camera imager driver
  14  * (C) Texas Instruments.
  15  */
  16
  17 #include <linux/clk.h>
  18 #include <linux/delay.h>
  19 #include <linux/gpio/consumer.h>
  20 #include <linux/i2c.h>
  21 #include <linux/kernel.h>
  22 #include <linux/module.h>
  23 #include <linux/mutex.h>
  24 #include <linux/regulator/consumer.h>
  25 #include <linux/slab.h>
  26 #include <linux/sort.h>
  27 #include <linux/v4l2-mediabus.h>
  28
  29 #include <media/media-entity.h>
  30 #include <media/v4l2-ctrls.h>
  31 #include <media/v4l2-device.h>
  32 #include <media/v4l2-subdev.h>
  33
  34 #include "et8ek8_reg.h"
  35
  36 #define ET8EK8_NAME             "et8ek8"
  37 #define ET8EK8_PRIV_MEM_SIZE    128
  38 #define ET8EK8_MAX_MSG          8
  39
  40 struct et8ek8_sensor {
  41         struct v4l2_subdev subdev;
  42         struct media_pad pad;
  43         struct v4l2_mbus_framefmt format;
  44         struct gpio_desc *reset;
  45         struct regulator *vana;
  46         struct clk *ext_clk;
  47         u32 xclk_freq;
  48
  49         u16 version;
  50
  51         struct v4l2_ctrl_handler ctrl_handler;
  52         struct v4l2_ctrl *exposure;
  53         struct v4l2_ctrl *pixel_rate;
  54         struct et8ek8_reglist *current_reglist;
  55
  56         u8 priv_mem[ET8EK8_PRIV_MEM_SIZE];
  57
  58         struct mutex power_lock;
  59         int power_count;
  60 };
  61
  62 #define to_et8ek8_sensor(sd)    container_of(sd, struct et8ek8_sensor, subdev)
  63
  64 enum et8ek8_versions {
  65         ET8EK8_REV_1 = 0x0001,
  66         ET8EK8_REV_2,
  67 };
  68
  69 /*
  70  * This table describes what should be written to the sensor register
  71  * for each gain value. The gain(index in the table) is in terms of
  72  * 0.1EV, i.e. 10 indexes in the table give 2 time more gain [0] in
  73  * the *analog gain, [1] in the digital gain
  74  *
  75  * Analog gain [dB] = 20*log10(regvalue/32); 0x20..0x100
  76  */
  77 static struct et8ek8_gain {
  78         u16 analog;
  79         u16 digital;
  80 } const et8ek8_gain_table[] = {
  81         { 32,    0},  /* x1 */
  82         { 34,    0},
  83         { 37,    0},
  84         { 39,    0},
  85         { 42,    0},
  86         { 45,    0},
  87         { 49,    0},
  88         { 52,    0},
  89         { 56,    0},
  90         { 60,    0},
  91         { 64,    0},  /* x2 */
  92         { 69,    0},
  93         { 74,    0},
  94         { 79,    0},
  95         { 84,    0},
  96         { 91,    0},
  97         { 97,    0},
  98         {104,    0},
  99         {111,    0},
 100         {119,    0},
 101         {128,    0},  /* x4 */
 102         {137,    0},
 103         {147,    0},
 104         {158,    0},
 105         {169,    0},
 106         {181,    0},
 107         {194,    0},
 108         {208,    0},
 109         {223,    0},
 110         {239,    0},
 111         {256,    0},  /* x8 */
 112         {256,   73},
 113         {256,  152},
 114         {256,  236},
 115         {256,  327},
 116         {256,  424},
 117         {256,  528},
 118         {256,  639},
 119         {256,  758},
 120         {256,  886},
 121         {256, 1023},  /* x16 */
 122 };
 123
 124 /* Register definitions */
 125 #define REG_REVISION_NUMBER_L   0x1200
 126 #define REG_REVISION_NUMBER_H   0x1201
 127
 128 #define PRIV_MEM_START_REG      0x0008
 129 #define PRIV_MEM_WIN_SIZE       8
 130
 131 #define ET8EK8_I2C_DELAY        3       /* msec delay b/w accesses */
 132
 133 #define USE_CRC                 1
 134
 135 /*
 136  * Register access helpers
 137  *
 138  * Read a 8/16/32-bit i2c register.  The value is returned in 'val'.
 139  * Returns zero if successful, or non-zero otherwise.
 140  */
 141 static int et8ek8_i2c_read_reg(struct i2c_client *client, u16 data_length,
 142                                u16 reg, u32 *val)
 143 {
 144         int r;
 145         struct i2c_msg msg;
 146         unsigned char data[4];
 147
 148         if (!client->adapter)
 149                 return -ENODEV;
 150         if (data_length != ET8EK8_REG_8BIT && data_length != ET8EK8_REG_16BIT)
 151                 return -EINVAL;
 152
 153         msg.addr = client->addr;
 154         msg.flags = 0;
 155         msg.len = 2;
 156         msg.buf = data;
 157
 158         /* high byte goes out first */
 159         data[0] = (u8) (reg >> 8);
 160         data[1] = (u8) (reg & 0xff);
 161         r = i2c_transfer(client->adapter, &msg, 1);
 162         if (r < 0)
 163                 goto err;
 164
 165         msg.len = data_length;
 166         msg.flags = I2C_M_RD;
 167         r = i2c_transfer(client->adapter, &msg, 1);
 168         if (r < 0)
 169                 goto err;
 170
 171         *val = 0;
 172         /* high byte comes first */
 173         if (data_length == ET8EK8_REG_8BIT)
 174                 *val = data[0];
 175         else
 176                 *val = (data[1] << 8) + data[0];
 177
 178         return 0;
 179
 180 err:
 181         dev_err(&client->dev, "read from offset 0x%x error %d\n", reg, r);
 182
 183         return r;
 184 }
 185
 186 static void et8ek8_i2c_create_msg(struct i2c_client *client, u16 len, u16 reg,
 187                                   u32 val, struct i2c_msg *msg,
 188                                   unsigned char *buf)
 189 {
 190         msg->addr = client->addr;
 191         msg->flags = 0; /* Write */
 192         msg->len = 2 + len;
 193         msg->buf = buf;
 194
 195         /* high byte goes out first */
 196         buf[0] = (u8) (reg >> 8);
 197         buf[1] = (u8) (reg & 0xff);
 198
 199         switch (len) {
 200         case ET8EK8_REG_8BIT:
 201                 buf[2] = (u8) (val) & 0xff;
 202                 break;
 203         case ET8EK8_REG_16BIT:
 204                 buf[2] = (u8) (val) & 0xff;
 205                 buf[3] = (u8) (val >> 8) & 0xff;
 206                 break;
 207         default:
 208                 WARN_ONCE(1, ET8EK8_NAME ": %s: invalid message length.\n",
 209                           __func__);
 210         }
 211 }
 212
 213 /*
 214  * A buffered write method that puts the wanted register write
 215  * commands in smaller number of message lists and passes the lists to
 216  * the i2c framework
 217  */
 218 static int et8ek8_i2c_buffered_write_regs(struct i2c_client *client,
 219                                           const struct et8ek8_reg *wnext,
 220                                           int cnt)
 221 {
 222         struct i2c_msg msg[ET8EK8_MAX_MSG];
 223         unsigned char data[ET8EK8_MAX_MSG][6];
 224         int wcnt = 0;
 225         u16 reg, data_length;
 226         u32 val;
 227         int rval;
 228
 229         /* Create new write messages for all writes */
 230         while (wcnt < cnt) {
 231                 data_length = wnext->type;
 232                 reg = wnext->reg;
 233                 val = wnext->val;
 234                 wnext++;
 235
 236                 et8ek8_i2c_create_msg(client, data_length, reg,
 237                                     val, &msg[wcnt], &data[wcnt][0]);
 238
 239                 /* Update write count */
 240                 wcnt++;
 241
 242                 if (wcnt < ET8EK8_MAX_MSG)
 243                         continue;
 244
 245                 rval = i2c_transfer(client->adapter, msg, wcnt);
 246                 if (rval < 0)
 247                         return rval;
 248
 249                 cnt -= wcnt;
 250                 wcnt = 0;
 251         }
 252
 253         rval = i2c_transfer(client->adapter, msg, wcnt);
 254
 255         return rval < 0 ? rval : 0;
 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_state *sd_state,
 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_state *sd_state,
 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_state *sd_state,
 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_state *sd_state,
 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, sd_state,
 999                                                   pad);
1000         case V4L2_SUBDEV_FORMAT_ACTIVE:
1001                 return &sensor->format;
1002         default:
1003                 return NULL;
1004         }
1005 }
1006
1007 static int et8ek8_get_pad_format(struct v4l2_subdev *subdev,
1008                                  struct v4l2_subdev_state *sd_state,
1009                                  struct v4l2_subdev_format *fmt)
1010 {
1011         struct et8ek8_sensor *sensor = to_et8ek8_sensor(subdev);
1012         struct v4l2_mbus_framefmt *format;
1013
1014         format = __et8ek8_get_pad_format(sensor, sd_state, fmt->pad,
1015                                          fmt->which);
1016         if (!format)
1017                 return -EINVAL;
1018
1019         fmt->format = *format;
1020
1021         return 0;
1022 }
1023
1024 static int et8ek8_set_pad_format(struct v4l2_subdev *subdev,
1025                                  struct v4l2_subdev_state *sd_state,
1026                                  struct v4l2_subdev_format *fmt)
1027 {
1028         struct et8ek8_sensor *sensor = to_et8ek8_sensor(subdev);
1029         struct v4l2_mbus_framefmt *format;
1030         struct et8ek8_reglist *reglist;
1031
1032         format = __et8ek8_get_pad_format(sensor, sd_state, fmt->pad,
1033                                          fmt->which);
1034         if (!format)
1035                 return -EINVAL;
1036
1037         reglist = et8ek8_reglist_find_mode_fmt(&meta_reglist, &fmt->format);
1038         et8ek8_reglist_to_mbus(reglist, &fmt->format);
1039         *format = fmt->format;
1040
1041         if (fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
1042                 sensor->current_reglist = reglist;
1043                 et8ek8_update_controls(sensor);
1044         }
1045
1046         return 0;
1047 }
1048
1049 static int et8ek8_get_frame_interval(struct v4l2_subdev *subdev,
1050                                      struct v4l2_subdev_frame_interval *fi)
1051 {
1052         struct et8ek8_sensor *sensor = to_et8ek8_sensor(subdev);
1053
1054         memset(fi, 0, sizeof(*fi));
1055         fi->interval = sensor->current_reglist->mode.timeperframe;
1056
1057         return 0;
1058 }
1059
1060 static int et8ek8_set_frame_interval(struct v4l2_subdev *subdev,
1061                                      struct v4l2_subdev_frame_interval *fi)
1062 {
1063         struct et8ek8_sensor *sensor = to_et8ek8_sensor(subdev);
1064         struct et8ek8_reglist *reglist;
1065
1066         reglist = et8ek8_reglist_find_mode_ival(&meta_reglist,
1067                                                 sensor->current_reglist,
1068                                                 &fi->interval);
1069
1070         if (!reglist)
1071                 return -EINVAL;
1072
1073         if (sensor->current_reglist->mode.ext_clock != reglist->mode.ext_clock)
1074                 return -EINVAL;
1075
1076         sensor->current_reglist = reglist;
1077         et8ek8_update_controls(sensor);
1078
1079         return 0;
1080 }
1081
1082 static int et8ek8_g_priv_mem(struct v4l2_subdev *subdev)
1083 {
1084         struct et8ek8_sensor *sensor = to_et8ek8_sensor(subdev);
1085         struct i2c_client *client = v4l2_get_subdevdata(subdev);
1086         unsigned int length = ET8EK8_PRIV_MEM_SIZE;
1087         unsigned int offset = 0;
1088         u8 *ptr  = sensor->priv_mem;
1089         int rval = 0;
1090
1091         /* Read the EEPROM window-by-window, each window 8 bytes */
1092         do {
1093                 u8 buffer[PRIV_MEM_WIN_SIZE];
1094                 struct i2c_msg msg;
1095                 int bytes, i;
1096                 int ofs;
1097
1098                 /* Set the current window */
1099                 rval = et8ek8_i2c_write_reg(client, ET8EK8_REG_8BIT, 0x0001,
1100                                             0xe0 | (offset >> 3));
1101                 if (rval < 0)
1102                         return rval;
1103
1104                 /* Wait for status bit */
1105                 for (i = 0; i < 1000; ++i) {
1106                         u32 status;
1107
1108                         rval = et8ek8_i2c_read_reg(client, ET8EK8_REG_8BIT,
1109                                                    0x0003, &status);
1110                         if (rval < 0)
1111                                 return rval;
1112                         if (!(status & 0x08))
1113                                 break;
1114                         usleep_range(1000, 2000);
1115                 }
1116
1117                 if (i == 1000)
1118                         return -EIO;
1119
1120                 /* Read window, 8 bytes at once, and copy to user space */
1121                 ofs = offset & 0x07;    /* Offset within this window */
1122                 bytes = length + ofs > 8 ? 8-ofs : length;
1123                 msg.addr = client->addr;
1124                 msg.flags = 0;
1125                 msg.len = 2;
1126                 msg.buf = buffer;
1127                 ofs += PRIV_MEM_START_REG;
1128                 buffer[0] = (u8)(ofs >> 8);
1129                 buffer[1] = (u8)(ofs & 0xFF);
1130
1131                 rval = i2c_transfer(client->adapter, &msg, 1);
1132                 if (rval < 0)
1133                         return rval;
1134
1135                 mdelay(ET8EK8_I2C_DELAY);
1136                 msg.addr = client->addr;
1137                 msg.len = bytes;
1138                 msg.flags = I2C_M_RD;
1139                 msg.buf = buffer;
1140                 memset(buffer, 0, sizeof(buffer));
1141
1142                 rval = i2c_transfer(client->adapter, &msg, 1);
1143                 if (rval < 0)
1144                         return rval;
1145
1146                 rval = 0;
1147                 memcpy(ptr, buffer, bytes);
1148
1149                 length -= bytes;
1150                 offset += bytes;
1151                 ptr += bytes;
1152         } while (length > 0);
1153
1154         return rval;
1155 }
1156
1157 static int et8ek8_dev_init(struct v4l2_subdev *subdev)
1158 {
1159         struct et8ek8_sensor *sensor = to_et8ek8_sensor(subdev);
1160         struct i2c_client *client = v4l2_get_subdevdata(subdev);
1161         int rval, rev_l, rev_h;
1162
1163         rval = et8ek8_power_on(sensor);
1164         if (rval) {
1165                 dev_err(&client->dev, "could not power on\n");
1166                 return rval;
1167         }
1168
1169         rval = et8ek8_i2c_read_reg(client, ET8EK8_REG_8BIT,
1170                                    REG_REVISION_NUMBER_L, &rev_l);
1171         if (!rval)
1172                 rval = et8ek8_i2c_read_reg(client, ET8EK8_REG_8BIT,
1173                                            REG_REVISION_NUMBER_H, &rev_h);
1174         if (rval) {
1175                 dev_err(&client->dev, "no et8ek8 sensor detected\n");
1176                 goto out_poweroff;
1177         }
1178
1179         sensor->version = (rev_h << 8) + rev_l;
1180         if (sensor->version != ET8EK8_REV_1 && sensor->version != ET8EK8_REV_2)
1181                 dev_info(&client->dev,
1182                          "unknown version 0x%x detected, continuing anyway\n",
1183                          sensor->version);
1184
1185         rval = et8ek8_reglist_import(client, &meta_reglist);
1186         if (rval) {
1187                 dev_err(&client->dev,
1188                         "invalid register list %s, import failed\n",
1189                         ET8EK8_NAME);
1190                 goto out_poweroff;
1191         }
1192
1193         sensor->current_reglist = et8ek8_reglist_find_type(&meta_reglist,
1194                                                            ET8EK8_REGLIST_MODE);
1195         if (!sensor->current_reglist) {
1196                 dev_err(&client->dev,
1197                         "invalid register list %s, no mode found\n",
1198                         ET8EK8_NAME);
1199                 rval = -ENODEV;
1200                 goto out_poweroff;
1201         }
1202
1203         et8ek8_reglist_to_mbus(sensor->current_reglist, &sensor->format);
1204
1205         rval = et8ek8_i2c_reglist_find_write(client, &meta_reglist,
1206                                              ET8EK8_REGLIST_POWERON);
1207         if (rval) {
1208                 dev_err(&client->dev,
1209                         "invalid register list %s, no POWERON mode found\n",
1210                         ET8EK8_NAME);
1211                 goto out_poweroff;
1212         }
1213         rval = et8ek8_stream_on(sensor); /* Needed to be able to read EEPROM */
1214         if (rval)
1215                 goto out_poweroff;
1216         rval = et8ek8_g_priv_mem(subdev);
1217         if (rval)
1218                 dev_warn(&client->dev,
1219                         "can not read OTP (EEPROM) memory from sensor\n");
1220         rval = et8ek8_stream_off(sensor);
1221         if (rval)
1222                 goto out_poweroff;
1223
1224         rval = et8ek8_power_off(sensor);
1225         if (rval)
1226                 goto out_poweroff;
1227
1228         return 0;
1229
1230 out_poweroff:
1231         et8ek8_power_off(sensor);
1232
1233         return rval;
1234 }
1235
1236 /* --------------------------------------------------------------------------
1237  * sysfs attributes
1238  */
1239 static ssize_t
1240 priv_mem_show(struct device *dev, struct device_attribute *attr, char *buf)
1241 {
1242         struct v4l2_subdev *subdev = dev_get_drvdata(dev);
1243         struct et8ek8_sensor *sensor = to_et8ek8_sensor(subdev);
1244
1245 #if PAGE_SIZE < ET8EK8_PRIV_MEM_SIZE
1246 #error PAGE_SIZE too small!
1247 #endif
1248
1249         memcpy(buf, sensor->priv_mem, ET8EK8_PRIV_MEM_SIZE);
1250
1251         return ET8EK8_PRIV_MEM_SIZE;
1252 }
1253 static DEVICE_ATTR_RO(priv_mem);
1254
1255 /* --------------------------------------------------------------------------
1256  * V4L2 subdev core operations
1257  */
1258
1259 static int
1260 et8ek8_registered(struct v4l2_subdev *subdev)
1261 {
1262         struct et8ek8_sensor *sensor = to_et8ek8_sensor(subdev);
1263         struct i2c_client *client = v4l2_get_subdevdata(subdev);
1264         int rval;
1265
1266         dev_dbg(&client->dev, "registered!");
1267
1268         rval = device_create_file(&client->dev, &dev_attr_priv_mem);
1269         if (rval) {
1270                 dev_err(&client->dev, "could not register sysfs entry\n");
1271                 return rval;
1272         }
1273
1274         rval = et8ek8_dev_init(subdev);
1275         if (rval)
1276                 goto err_file;
1277
1278         rval = et8ek8_init_controls(sensor);
1279         if (rval) {
1280                 dev_err(&client->dev, "controls initialization failed\n");
1281                 goto err_file;
1282         }
1283
1284         __et8ek8_get_pad_format(sensor, NULL, 0, V4L2_SUBDEV_FORMAT_ACTIVE);
1285
1286         return 0;
1287
1288 err_file:
1289         device_remove_file(&client->dev, &dev_attr_priv_mem);
1290
1291         return rval;
1292 }
1293
1294 static int __et8ek8_set_power(struct et8ek8_sensor *sensor, bool on)
1295 {
1296         return on ? et8ek8_power_on(sensor) : et8ek8_power_off(sensor);
1297 }
1298
1299 static int et8ek8_set_power(struct v4l2_subdev *subdev, int on)
1300 {
1301         struct et8ek8_sensor *sensor = to_et8ek8_sensor(subdev);
1302         int ret = 0;
1303
1304         mutex_lock(&sensor->power_lock);
1305
1306         /* If the power count is modified from 0 to != 0 or from != 0 to 0,
1307          * update the power state.
1308          */
1309         if (sensor->power_count == !on) {
1310                 ret = __et8ek8_set_power(sensor, !!on);
1311                 if (ret < 0)
1312                         goto done;
1313         }
1314
1315         /* Update the power count. */
1316         sensor->power_count += on ? 1 : -1;
1317         WARN_ON(sensor->power_count < 0);
1318
1319 done:
1320         mutex_unlock(&sensor->power_lock);
1321
1322         return ret;
1323 }
1324
1325 static int et8ek8_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
1326 {
1327         struct et8ek8_sensor *sensor = to_et8ek8_sensor(sd);
1328         struct v4l2_mbus_framefmt *format;
1329         struct et8ek8_reglist *reglist;
1330
1331         reglist = et8ek8_reglist_find_type(&meta_reglist, ET8EK8_REGLIST_MODE);
1332         format = __et8ek8_get_pad_format(sensor, fh->state, 0,
1333                                          V4L2_SUBDEV_FORMAT_TRY);
1334         et8ek8_reglist_to_mbus(reglist, format);
1335
1336         return et8ek8_set_power(sd, true);
1337 }
1338
1339 static int et8ek8_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
1340 {
1341         return et8ek8_set_power(sd, false);
1342 }
1343
1344 static const struct v4l2_subdev_video_ops et8ek8_video_ops = {
1345         .s_stream = et8ek8_s_stream,
1346         .g_frame_interval = et8ek8_get_frame_interval,
1347         .s_frame_interval = et8ek8_set_frame_interval,
1348 };
1349
1350 static const struct v4l2_subdev_core_ops et8ek8_core_ops = {
1351         .s_power = et8ek8_set_power,
1352 };
1353
1354 static const struct v4l2_subdev_pad_ops et8ek8_pad_ops = {
1355         .enum_mbus_code = et8ek8_enum_mbus_code,
1356         .enum_frame_size = et8ek8_enum_frame_size,
1357         .enum_frame_interval = et8ek8_enum_frame_ival,
1358         .get_fmt = et8ek8_get_pad_format,
1359         .set_fmt = et8ek8_set_pad_format,
1360 };
1361
1362 static const struct v4l2_subdev_ops et8ek8_ops = {
1363         .core = &et8ek8_core_ops,
1364         .video = &et8ek8_video_ops,
1365         .pad = &et8ek8_pad_ops,
1366 };
1367
1368 static const struct v4l2_subdev_internal_ops et8ek8_internal_ops = {
1369         .registered = et8ek8_registered,
1370         .open = et8ek8_open,
1371         .close = et8ek8_close,
1372 };
1373
1374 /* --------------------------------------------------------------------------
1375  * I2C driver
1376  */
1377 static int __maybe_unused et8ek8_suspend(struct device *dev)
1378 {
1379         struct v4l2_subdev *subdev = dev_get_drvdata(dev);
1380         struct et8ek8_sensor *sensor = to_et8ek8_sensor(subdev);
1381
1382         if (!sensor->power_count)
1383                 return 0;
1384
1385         return __et8ek8_set_power(sensor, false);
1386 }
1387
1388 static int __maybe_unused et8ek8_resume(struct device *dev)
1389 {
1390         struct v4l2_subdev *subdev = dev_get_drvdata(dev);
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 {
1401         struct et8ek8_sensor *sensor;
1402         struct device *dev = &client->dev;
1403         int ret;
1404
1405         sensor = devm_kzalloc(&client->dev, sizeof(*sensor), GFP_KERNEL);
1406         if (!sensor)
1407                 return -ENOMEM;
1408
1409         sensor->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
1410         if (IS_ERR(sensor->reset)) {
1411                 dev_dbg(&client->dev, "could not request reset gpio\n");
1412                 return PTR_ERR(sensor->reset);
1413         }
1414
1415         sensor->vana = devm_regulator_get(dev, "vana");
1416         if (IS_ERR(sensor->vana)) {
1417                 dev_err(&client->dev, "could not get regulator for vana\n");
1418                 return PTR_ERR(sensor->vana);
1419         }
1420
1421         sensor->ext_clk = devm_clk_get(dev, NULL);
1422         if (IS_ERR(sensor->ext_clk)) {
1423                 dev_err(&client->dev, "could not get clock\n");
1424                 return PTR_ERR(sensor->ext_clk);
1425         }
1426
1427         ret = of_property_read_u32(dev->of_node, "clock-frequency",
1428                                    &sensor->xclk_freq);
1429         if (ret) {
1430                 dev_warn(dev, "can't get clock-frequency\n");
1431                 return ret;
1432         }
1433
1434         mutex_init(&sensor->power_lock);
1435
1436         v4l2_i2c_subdev_init(&sensor->subdev, client, &et8ek8_ops);
1437         sensor->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
1438         sensor->subdev.internal_ops = &et8ek8_internal_ops;
1439
1440         sensor->subdev.entity.function = MEDIA_ENT_F_CAM_SENSOR;
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(&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 void __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
1482 static const struct of_device_id et8ek8_of_table[] = {
1483         { .compatible = "toshiba,et8ek8" },
1484         { },
1485 };
1486 MODULE_DEVICE_TABLE(of, et8ek8_of_table);
1487
1488 static const struct i2c_device_id et8ek8_id_table[] = {
1489         { ET8EK8_NAME, 0 },
1490         { }
1491 };
1492 MODULE_DEVICE_TABLE(i2c, et8ek8_id_table);
1493
1494 static const struct dev_pm_ops et8ek8_pm_ops = {
1495         SET_SYSTEM_SLEEP_PM_OPS(et8ek8_suspend, et8ek8_resume)
1496 };
1497
1498 static struct i2c_driver et8ek8_i2c_driver = {
1499         .driver         = {
1500                 .name   = ET8EK8_NAME,
1501                 .pm     = &et8ek8_pm_ops,
1502                 .of_match_table = et8ek8_of_table,
1503         },
1504         .probe          = et8ek8_probe,
1505         .remove         = __exit_p(et8ek8_remove),
1506         .id_table       = et8ek8_id_table,
1507 };
1508
1509 module_i2c_driver(et8ek8_i2c_driver);
1510
1511 MODULE_AUTHOR("Sakari Ailus <sakari.ailus@iki.fi>, Pavel Machek <pavel@ucw.cz");
1512 MODULE_DESCRIPTION("Toshiba ET8EK8 camera sensor driver");
1513 MODULE_LICENSE("GPL");