drivers/staging/media/atomisp/i2c/gc2235.c

   1 /*
   2  * Support for GalaxyCore GC2235 2M camera sensor.
   3  *
   4  * Copyright (c) 2014 Intel Corporation. All Rights Reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License version
   8  * 2 as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  */
  16
  17 #include <linux/module.h>
  18 #include <linux/types.h>
  19 #include <linux/kernel.h>
  20 #include <linux/mm.h>
  21 #include <linux/string.h>
  22 #include <linux/errno.h>
  23 #include <linux/init.h>
  24 #include <linux/kmod.h>
  25 #include <linux/device.h>
  26 #include <linux/delay.h>
  27 #include <linux/slab.h>
  28 #include <linux/i2c.h>
  29 #include <linux/gpio.h>
  30 #include <linux/moduleparam.h>
  31 #include <media/v4l2-device.h>
  32 #include "../include/linux/atomisp_gmin_platform.h"
  33 #include <linux/acpi.h>
  34 #include <linux/io.h>
  35
  36 #include "gc2235.h"
  37
  38 /* i2c read/write stuff */
  39 static int gc2235_read_reg(struct i2c_client *client,
  40                            u16 data_length, u16 reg, u16 *val)
  41 {
  42         int err;
  43         struct i2c_msg msg[2];
  44         unsigned char data[6];
  45
  46         if (!client->adapter) {
  47                 dev_err(&client->dev, "%s error, no client->adapter\n",
  48                         __func__);
  49                 return -ENODEV;
  50         }
  51
  52         if (data_length != GC2235_8BIT) {
  53                 dev_err(&client->dev, "%s error, invalid data length\n",
  54                         __func__);
  55                 return -EINVAL;
  56         }
  57
  58         memset(msg, 0, sizeof(msg));
  59
  60         msg[0].addr = client->addr;
  61         msg[0].flags = 0;
  62         msg[0].len = 1;
  63         msg[0].buf = data;
  64
  65         /* high byte goes out first */
  66         data[0] = (u8)(reg & 0xff);
  67
  68         msg[1].addr = client->addr;
  69         msg[1].len = data_length;
  70         msg[1].flags = I2C_M_RD;
  71         msg[1].buf = data;
  72
  73         err = i2c_transfer(client->adapter, msg, 2);
  74         if (err != 2) {
  75                 if (err >= 0)
  76                         err = -EIO;
  77                 dev_err(&client->dev,
  78                         "read from offset 0x%x error %d", reg, err);
  79                 return err;
  80         }
  81
  82         *val = 0;
  83         /* high byte comes first */
  84         if (data_length == GC2235_8BIT)
  85                 *val = (u8)data[0];
  86
  87         return 0;
  88 }
  89
  90 static int gc2235_i2c_write(struct i2c_client *client, u16 len, u8 *data)
  91 {
  92         struct i2c_msg msg;
  93         const int num_msg = 1;
  94         int ret;
  95
  96         msg.addr = client->addr;
  97         msg.flags = 0;
  98         msg.len = len;
  99         msg.buf = data;
 100         ret = i2c_transfer(client->adapter, &msg, 1);
 101
 102         return ret == num_msg ? 0 : -EIO;
 103 }
 104
 105 static int gc2235_write_reg(struct i2c_client *client, u16 data_length,
 106                                                         u8 reg, u8 val)
 107 {
 108         int ret;
 109         unsigned char data[4] = {0};
 110         const u16 len = data_length + sizeof(u8); /* 16-bit address + data */
 111
 112         if (data_length != GC2235_8BIT) {
 113                 dev_err(&client->dev,
 114                         "%s error, invalid data_length\n", __func__);
 115                 return -EINVAL;
 116         }
 117
 118         /* high byte goes out first */
 119         data[0] = reg;
 120         data[1] = val;
 121
 122         ret = gc2235_i2c_write(client, len, data);
 123         if (ret)
 124                 dev_err(&client->dev,
 125                         "write error: wrote 0x%x to offset 0x%x error %d",
 126                         val, reg, ret);
 127
 128         return ret;
 129 }
 130
 131 static int __gc2235_flush_reg_array(struct i2c_client *client,
 132                                     struct gc2235_write_ctrl *ctrl)
 133 {
 134         u16 size;
 135
 136         if (ctrl->index == 0)
 137                 return 0;
 138
 139         size = sizeof(u8) + ctrl->index; /* 8-bit address + data */
 140         ctrl->index = 0;
 141
 142         return gc2235_i2c_write(client, size, (u8 *)&ctrl->buffer);
 143 }
 144
 145 static int __gc2235_buf_reg_array(struct i2c_client *client,
 146                                   struct gc2235_write_ctrl *ctrl,
 147                                   const struct gc2235_reg *next)
 148 {
 149         int size;
 150
 151         if (next->type != GC2235_8BIT)
 152                 return -EINVAL;
 153
 154         size = 1;
 155         ctrl->buffer.data[ctrl->index] = (u8)next->val;
 156
 157         /* When first item is added, we need to store its starting address */
 158         if (ctrl->index == 0)
 159                 ctrl->buffer.addr = next->reg;
 160
 161         ctrl->index += size;
 162
 163         /*
 164          * Buffer cannot guarantee free space for u32? Better flush it to avoid
 165          * possible lack of memory for next item.
 166          */
 167         if (ctrl->index + sizeof(u8) >= GC2235_MAX_WRITE_BUF_SIZE)
 168                 return __gc2235_flush_reg_array(client, ctrl);
 169
 170         return 0;
 171 }
 172 static int __gc2235_write_reg_is_consecutive(struct i2c_client *client,
 173                                              struct gc2235_write_ctrl *ctrl,
 174                                              const struct gc2235_reg *next)
 175 {
 176         if (ctrl->index == 0)
 177                 return 1;
 178
 179         return ctrl->buffer.addr + ctrl->index == next->reg;
 180 }
 181 static int gc2235_write_reg_array(struct i2c_client *client,
 182                                   const struct gc2235_reg *reglist)
 183 {
 184         const struct gc2235_reg *next = reglist;
 185         struct gc2235_write_ctrl ctrl;
 186         int err;
 187
 188         ctrl.index = 0;
 189         for (; next->type != GC2235_TOK_TERM; next++) {
 190                 switch (next->type & GC2235_TOK_MASK) {
 191                 case GC2235_TOK_DELAY:
 192                         err = __gc2235_flush_reg_array(client, &ctrl);
 193                         if (err)
 194                                 return err;
 195                         msleep(next->val);
 196                         break;
 197                 default:
 198                         /*
 199                          * If next address is not consecutive, data needs to be
 200                          * flushed before proceed.
 201                          */
 202                         if (!__gc2235_write_reg_is_consecutive(client, &ctrl,
 203                                                                 next)) {
 204                                 err = __gc2235_flush_reg_array(client, &ctrl);
 205                                 if (err)
 206                                         return err;
 207                         }
 208                         err = __gc2235_buf_reg_array(client, &ctrl, next);
 209                         if (err) {
 210                                 dev_err(&client->dev, "%s: write error, aborted\n",
 211                                          __func__);
 212                                 return err;
 213                         }
 214                         break;
 215                 }
 216         }
 217
 218         return __gc2235_flush_reg_array(client, &ctrl);
 219 }
 220
 221 static int gc2235_g_focal(struct v4l2_subdev *sd, s32 *val)
 222 {
 223         *val = (GC2235_FOCAL_LENGTH_NUM << 16) | GC2235_FOCAL_LENGTH_DEM;
 224         return 0;
 225 }
 226
 227 static int gc2235_g_fnumber(struct v4l2_subdev *sd, s32 *val)
 228 {
 229         /*const f number for imx*/
 230         *val = (GC2235_F_NUMBER_DEFAULT_NUM << 16) | GC2235_F_NUMBER_DEM;
 231         return 0;
 232 }
 233
 234 static int gc2235_g_fnumber_range(struct v4l2_subdev *sd, s32 *val)
 235 {
 236         *val = (GC2235_F_NUMBER_DEFAULT_NUM << 24) |
 237                 (GC2235_F_NUMBER_DEM << 16) |
 238                 (GC2235_F_NUMBER_DEFAULT_NUM << 8) | GC2235_F_NUMBER_DEM;
 239         return 0;
 240 }
 241
 242
 243 static int gc2235_get_intg_factor(struct i2c_client *client,
 244                                 struct camera_mipi_info *info,
 245                                 const struct gc2235_resolution *res)
 246 {
 247         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 248         struct gc2235_device *dev = to_gc2235_sensor(sd);
 249         struct atomisp_sensor_mode_data *buf = &info->data;
 250         u16 reg_val, reg_val_h, dummy;
 251         int ret;
 252
 253         if (!info)
 254                 return -EINVAL;
 255
 256         /* pixel clock calculattion */
 257         buf->vt_pix_clk_freq_mhz = dev->vt_pix_clk_freq_mhz = 30000000;
 258
 259         /* get integration time */
 260         buf->coarse_integration_time_min = GC2235_COARSE_INTG_TIME_MIN;
 261         buf->coarse_integration_time_max_margin =
 262                                         GC2235_COARSE_INTG_TIME_MAX_MARGIN;
 263
 264         buf->fine_integration_time_min = GC2235_FINE_INTG_TIME_MIN;
 265         buf->fine_integration_time_max_margin =
 266                                         GC2235_FINE_INTG_TIME_MAX_MARGIN;
 267
 268         buf->fine_integration_time_def = GC2235_FINE_INTG_TIME_MIN;
 269         buf->frame_length_lines = res->lines_per_frame;
 270         buf->line_length_pck = res->pixels_per_line;
 271         buf->read_mode = res->bin_mode;
 272
 273         /* get the cropping and output resolution to ISP for this mode. */
 274         ret =  gc2235_read_reg(client, GC2235_8BIT,
 275                                         GC2235_H_CROP_START_H, &reg_val_h);
 276         ret =  gc2235_read_reg(client, GC2235_8BIT,
 277                                         GC2235_H_CROP_START_L, &reg_val);
 278         if (ret)
 279                 return ret;
 280
 281         buf->crop_horizontal_start = (reg_val_h << 8) | reg_val;
 282
 283         ret =  gc2235_read_reg(client, GC2235_8BIT,
 284                                         GC2235_V_CROP_START_H, &reg_val_h);
 285         ret =  gc2235_read_reg(client, GC2235_8BIT,
 286                                         GC2235_V_CROP_START_L, &reg_val);
 287         if (ret)
 288                 return ret;
 289
 290         buf->crop_vertical_start = (reg_val_h << 8) | reg_val;
 291
 292         ret = gc2235_read_reg(client, GC2235_8BIT,
 293                                         GC2235_H_OUTSIZE_H, &reg_val_h);
 294         ret = gc2235_read_reg(client, GC2235_8BIT,
 295                                         GC2235_H_OUTSIZE_L, &reg_val);
 296         if (ret)
 297                 return ret;
 298         buf->output_width = (reg_val_h << 8) | reg_val;
 299
 300         ret = gc2235_read_reg(client, GC2235_8BIT,
 301                                         GC2235_V_OUTSIZE_H, &reg_val_h);
 302         ret = gc2235_read_reg(client, GC2235_8BIT,
 303                                         GC2235_V_OUTSIZE_L, &reg_val);
 304         if (ret)
 305                 return ret;
 306         buf->output_height = (reg_val_h << 8) | reg_val;
 307
 308         buf->crop_horizontal_end = buf->crop_horizontal_start +
 309                                                 buf->output_width - 1;
 310         buf->crop_vertical_end = buf->crop_vertical_start +
 311                                                 buf->output_height - 1;
 312
 313         ret = gc2235_read_reg(client, GC2235_8BIT,
 314                                         GC2235_HB_H, &reg_val_h);
 315         ret = gc2235_read_reg(client, GC2235_8BIT,
 316                                         GC2235_HB_L, &reg_val);
 317         if (ret)
 318                 return ret;
 319
 320         dummy = (reg_val_h << 8) | reg_val;
 321
 322         ret = gc2235_read_reg(client, GC2235_8BIT,
 323                                         GC2235_SH_DELAY_H, &reg_val_h);
 324         ret = gc2235_read_reg(client, GC2235_8BIT,
 325                                         GC2235_SH_DELAY_L, &reg_val);
 326
 327 #if 0
 328         buf->line_length_pck = buf->output_width + 16 + dummy +
 329                                 (((u16)reg_val_h << 8) | (u16)reg_val) + 4;
 330 #endif
 331         ret = gc2235_read_reg(client, GC2235_8BIT,
 332                                         GC2235_VB_H, &reg_val_h);
 333         ret = gc2235_read_reg(client, GC2235_8BIT,
 334                                         GC2235_VB_L, &reg_val);
 335         if (ret)
 336                 return ret;
 337
 338 #if 0
 339         buf->frame_length_lines = buf->output_height + 32 +
 340                                 (((u16)reg_val_h << 8) | (u16)reg_val);
 341 #endif
 342         buf->binning_factor_x = res->bin_factor_x ?
 343                                         res->bin_factor_x : 1;
 344         buf->binning_factor_y = res->bin_factor_y ?
 345                                         res->bin_factor_y : 1;
 346         return 0;
 347 }
 348
 349 static long __gc2235_set_exposure(struct v4l2_subdev *sd, int coarse_itg,
 350                                  int gain, int digitgain)
 351
 352 {
 353         struct i2c_client *client = v4l2_get_subdevdata(sd);
 354         u16 coarse_integration = (u16)coarse_itg;
 355         int ret = 0;
 356         u16 expo_coarse_h, expo_coarse_l, gain_val = 0xF0, gain_val2 = 0xF0;
 357         expo_coarse_h = coarse_integration >> 8;
 358         expo_coarse_l = coarse_integration & 0xff;
 359
 360         ret = gc2235_write_reg(client, GC2235_8BIT,
 361                                         GC2235_EXPOSURE_H, expo_coarse_h);
 362         ret = gc2235_write_reg(client, GC2235_8BIT,
 363                                         GC2235_EXPOSURE_L, expo_coarse_l);
 364
 365         if (gain <= 0x58) {
 366                 gain_val = 0x40;
 367                 gain_val2 = 0x58;
 368         } else if (gain < 256) {
 369                 gain_val = 0x40;
 370                 gain_val2 = gain;
 371         } else {
 372                 gain_val2 = 64 * gain / 256;
 373                 gain_val = 0xff;
 374         }
 375
 376         ret = gc2235_write_reg(client, GC2235_8BIT,
 377                                         GC2235_GLOBAL_GAIN, (u8)gain_val);
 378         ret = gc2235_write_reg(client, GC2235_8BIT,
 379                                         GC2235_PRE_GAIN, (u8)gain_val2);
 380
 381         return ret;
 382 }
 383
 384
 385 static int gc2235_set_exposure(struct v4l2_subdev *sd, int exposure,
 386         int gain, int digitgain)
 387 {
 388         struct gc2235_device *dev = to_gc2235_sensor(sd);
 389         int ret;
 390
 391         mutex_lock(&dev->input_lock);
 392         ret = __gc2235_set_exposure(sd, exposure, gain, digitgain);
 393         mutex_unlock(&dev->input_lock);
 394
 395         return ret;
 396 }
 397
 398 static long gc2235_s_exposure(struct v4l2_subdev *sd,
 399                                struct atomisp_exposure *exposure)
 400 {
 401         int exp = exposure->integration_time[0];
 402         int gain = exposure->gain[0];
 403         int digitgain = exposure->gain[1];
 404
 405         /* we should not accept the invalid value below. */
 406         if (gain == 0) {
 407                 struct i2c_client *client = v4l2_get_subdevdata(sd);
 408                 v4l2_err(client, "%s: invalid value\n", __func__);
 409                 return -EINVAL;
 410         }
 411
 412         return gc2235_set_exposure(sd, exp, gain, digitgain);
 413 }
 414 static long gc2235_ioctl(struct v4l2_subdev *sd, unsigned int cmd, void *arg)
 415 {
 416         switch (cmd) {
 417         case ATOMISP_IOC_S_EXPOSURE:
 418                 return gc2235_s_exposure(sd, arg);
 419         default:
 420                 return -EINVAL;
 421         }
 422         return 0;
 423 }
 424 /* This returns the exposure time being used. This should only be used
 425  * for filling in EXIF data, not for actual image processing.
 426  */
 427 static int gc2235_q_exposure(struct v4l2_subdev *sd, s32 *value)
 428 {
 429         struct i2c_client *client = v4l2_get_subdevdata(sd);
 430         u16 reg_v, reg_v2;
 431         int ret;
 432
 433         /* get exposure */
 434         ret = gc2235_read_reg(client, GC2235_8BIT,
 435                                         GC2235_EXPOSURE_L,
 436                                         &reg_v);
 437         if (ret)
 438                 goto err;
 439
 440         ret = gc2235_read_reg(client, GC2235_8BIT,
 441                                         GC2235_EXPOSURE_H,
 442                                         &reg_v2);
 443         if (ret)
 444                 goto err;
 445
 446         reg_v += reg_v2 << 8;
 447
 448         *value = reg_v;
 449 err:
 450         return ret;
 451 }
 452
 453 static int gc2235_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
 454 {
 455         struct gc2235_device *dev =
 456             container_of(ctrl->handler, struct gc2235_device, ctrl_handler);
 457         int ret = 0;
 458
 459         switch (ctrl->id) {
 460         case V4L2_CID_EXPOSURE_ABSOLUTE:
 461                 ret = gc2235_q_exposure(&dev->sd, &ctrl->val);
 462                 break;
 463         case V4L2_CID_FOCAL_ABSOLUTE:
 464                 ret = gc2235_g_focal(&dev->sd, &ctrl->val);
 465                 break;
 466         case V4L2_CID_FNUMBER_ABSOLUTE:
 467                 ret = gc2235_g_fnumber(&dev->sd, &ctrl->val);
 468                 break;
 469         case V4L2_CID_FNUMBER_RANGE:
 470                 ret = gc2235_g_fnumber_range(&dev->sd, &ctrl->val);
 471                 break;
 472         default:
 473                 ret = -EINVAL;
 474         }
 475
 476         return ret;
 477 }
 478
 479 static const struct v4l2_ctrl_ops ctrl_ops = {
 480         .g_volatile_ctrl = gc2235_g_volatile_ctrl
 481 };
 482
 483 struct v4l2_ctrl_config gc2235_controls[] = {
 484         {
 485          .ops = &ctrl_ops,
 486          .id = V4L2_CID_EXPOSURE_ABSOLUTE,
 487          .type = V4L2_CTRL_TYPE_INTEGER,
 488          .name = "exposure",
 489          .min = 0x0,
 490          .max = 0xffff,
 491          .step = 0x01,
 492          .def = 0x00,
 493          .flags = 0,
 494          },
 495         {
 496          .ops = &ctrl_ops,
 497          .id = V4L2_CID_FOCAL_ABSOLUTE,
 498          .type = V4L2_CTRL_TYPE_INTEGER,
 499          .name = "focal length",
 500          .min = GC2235_FOCAL_LENGTH_DEFAULT,
 501          .max = GC2235_FOCAL_LENGTH_DEFAULT,
 502          .step = 0x01,
 503          .def = GC2235_FOCAL_LENGTH_DEFAULT,
 504          .flags = 0,
 505          },
 506         {
 507          .ops = &ctrl_ops,
 508          .id = V4L2_CID_FNUMBER_ABSOLUTE,
 509          .type = V4L2_CTRL_TYPE_INTEGER,
 510          .name = "f-number",
 511          .min = GC2235_F_NUMBER_DEFAULT,
 512          .max = GC2235_F_NUMBER_DEFAULT,
 513          .step = 0x01,
 514          .def = GC2235_F_NUMBER_DEFAULT,
 515          .flags = 0,
 516          },
 517         {
 518          .ops = &ctrl_ops,
 519          .id = V4L2_CID_FNUMBER_RANGE,
 520          .type = V4L2_CTRL_TYPE_INTEGER,
 521          .name = "f-number range",
 522          .min = GC2235_F_NUMBER_RANGE,
 523          .max = GC2235_F_NUMBER_RANGE,
 524          .step = 0x01,
 525          .def = GC2235_F_NUMBER_RANGE,
 526          .flags = 0,
 527          },
 528 };
 529
 530 static int __gc2235_init(struct v4l2_subdev *sd)
 531 {
 532         struct i2c_client *client = v4l2_get_subdevdata(sd);
 533
 534         /* restore settings */
 535         gc2235_res = gc2235_res_preview;
 536         N_RES = N_RES_PREVIEW;
 537
 538         return gc2235_write_reg_array(client, gc2235_init_settings);
 539 }
 540
 541 static int is_init;
 542
 543 static int power_ctrl(struct v4l2_subdev *sd, bool flag)
 544 {
 545         int ret = -1;
 546         struct gc2235_device *dev = to_gc2235_sensor(sd);
 547
 548         if (!dev || !dev->platform_data)
 549                 return -ENODEV;
 550
 551         /* Non-gmin platforms use the legacy callback */
 552         if (dev->platform_data->power_ctrl)
 553                 return dev->platform_data->power_ctrl(sd, flag);
 554
 555         if (flag) {
 556                 ret = dev->platform_data->v1p8_ctrl(sd, 1);
 557                 usleep_range(60, 90);
 558                 if (ret == 0)
 559                         ret |= dev->platform_data->v2p8_ctrl(sd, 1);
 560         } else {
 561                 ret = dev->platform_data->v1p8_ctrl(sd, 0);
 562                 ret |= dev->platform_data->v2p8_ctrl(sd, 0);
 563         }
 564         return ret;
 565 }
 566
 567 static int gpio_ctrl(struct v4l2_subdev *sd, bool flag)
 568 {
 569         struct gc2235_device *dev = to_gc2235_sensor(sd);
 570         int ret = -1;
 571
 572         if (!dev || !dev->platform_data)
 573                 return -ENODEV;
 574
 575         /* Non-gmin platforms use the legacy callback */
 576         if (dev->platform_data->gpio_ctrl)
 577                 return dev->platform_data->gpio_ctrl(sd, flag);
 578
 579         ret |= dev->platform_data->gpio1_ctrl(sd, !flag);
 580         usleep_range(60, 90);
 581         return dev->platform_data->gpio0_ctrl(sd, flag);
 582 }
 583
 584 static int power_up(struct v4l2_subdev *sd)
 585 {
 586         struct gc2235_device *dev = to_gc2235_sensor(sd);
 587         struct i2c_client *client = v4l2_get_subdevdata(sd);
 588         int ret;
 589
 590         if (!dev->platform_data) {
 591                 dev_err(&client->dev,
 592                         "no camera_sensor_platform_data");
 593                 return -ENODEV;
 594         }
 595         /* power control */
 596         ret = power_ctrl(sd, 1);
 597         if (ret)
 598                 goto fail_power;
 599
 600         /* according to DS, at least 5ms is needed between DOVDD and PWDN */
 601         usleep_range(5000, 6000);
 602
 603         ret = dev->platform_data->flisclk_ctrl(sd, 1);
 604         if (ret)
 605                 goto fail_clk;
 606         usleep_range(5000, 6000);
 607
 608         /* gpio ctrl */
 609         ret = gpio_ctrl(sd, 1);
 610         if (ret) {
 611                 ret = gpio_ctrl(sd, 1);
 612                 if (ret)
 613                         goto fail_power;
 614         }
 615
 616         msleep(5);
 617         return 0;
 618
 619 fail_clk:
 620         gpio_ctrl(sd, 0);
 621 fail_power:
 622         power_ctrl(sd, 0);
 623         dev_err(&client->dev, "sensor power-up failed\n");
 624
 625         return ret;
 626 }
 627
 628 static int power_down(struct v4l2_subdev *sd)
 629 {
 630         struct gc2235_device *dev = to_gc2235_sensor(sd);
 631         struct i2c_client *client = v4l2_get_subdevdata(sd);
 632         int ret = 0;
 633
 634         if (!dev->platform_data) {
 635                 dev_err(&client->dev,
 636                         "no camera_sensor_platform_data");
 637                 return -ENODEV;
 638         }
 639         /* gpio ctrl */
 640         ret = gpio_ctrl(sd, 0);
 641         if (ret) {
 642                 ret = gpio_ctrl(sd, 0);
 643                 if (ret)
 644                         dev_err(&client->dev, "gpio failed 2\n");
 645         }
 646
 647         ret = dev->platform_data->flisclk_ctrl(sd, 0);
 648         if (ret)
 649                 dev_err(&client->dev, "flisclk failed\n");
 650
 651         /* power control */
 652         ret = power_ctrl(sd, 0);
 653         if (ret)
 654                 dev_err(&client->dev, "vprog failed.\n");
 655
 656         return ret;
 657 }
 658
 659 static int gc2235_s_power(struct v4l2_subdev *sd, int on)
 660 {
 661         int ret;
 662
 663         if (on == 0)
 664                 ret = power_down(sd);
 665         else {
 666                 ret = power_up(sd);
 667                 if (!ret)
 668                         ret = __gc2235_init(sd);
 669                 is_init = 1;
 670         }
 671         return ret;
 672 }
 673
 674 /*
 675  * distance - calculate the distance
 676  * @res: resolution
 677  * @w: width
 678  * @h: height
 679  *
 680  * Get the gap between resolution and w/h.
 681  * res->width/height smaller than w/h wouldn't be considered.
 682  * Returns the value of gap or -1 if fail.
 683  */
 684 #define LARGEST_ALLOWED_RATIO_MISMATCH 800
 685 static int distance(struct gc2235_resolution *res, u32 w, u32 h)
 686 {
 687         unsigned int w_ratio = (res->width << 13) / w;
 688         unsigned int h_ratio;
 689         int match;
 690
 691         if (h == 0)
 692                 return -1;
 693         h_ratio = (res->height << 13) / h;
 694         if (h_ratio == 0)
 695                 return -1;
 696         match   = abs(((w_ratio << 13) / h_ratio) - 8192);
 697
 698         if ((w_ratio < 8192) || (h_ratio < 8192) ||
 699             (match > LARGEST_ALLOWED_RATIO_MISMATCH))
 700                 return -1;
 701
 702         return w_ratio + h_ratio;
 703 }
 704
 705 /* Return the nearest higher resolution index */
 706 static int nearest_resolution_index(int w, int h)
 707 {
 708         int i;
 709         int idx = -1;
 710         int dist;
 711         int min_dist = INT_MAX;
 712         struct gc2235_resolution *tmp_res = NULL;
 713
 714         for (i = 0; i < N_RES; i++) {
 715                 tmp_res = &gc2235_res[i];
 716                 dist = distance(tmp_res, w, h);
 717                 if (dist == -1)
 718                         continue;
 719                 if (dist < min_dist) {
 720                         min_dist = dist;
 721                         idx = i;
 722                 }
 723         }
 724
 725         return idx;
 726 }
 727
 728 static int get_resolution_index(int w, int h)
 729 {
 730         int i;
 731
 732         for (i = 0; i < N_RES; i++) {
 733                 if (w != gc2235_res[i].width)
 734                         continue;
 735                 if (h != gc2235_res[i].height)
 736                         continue;
 737
 738                 return i;
 739         }
 740
 741         return -1;
 742 }
 743
 744 static int startup(struct v4l2_subdev *sd)
 745 {
 746         struct gc2235_device *dev = to_gc2235_sensor(sd);
 747         struct i2c_client *client = v4l2_get_subdevdata(sd);
 748         int ret = 0;
 749         if (is_init == 0) {
 750                 /* force gc2235 to do a reset in res change, otherwise it
 751                 * can not output normal after switching res. and it is not
 752                 * necessary for first time run up after power on, for the sack
 753                 * of performance
 754                 */
 755                 power_down(sd);
 756                 power_up(sd);
 757                 gc2235_write_reg_array(client, gc2235_init_settings);
 758         }
 759
 760         ret = gc2235_write_reg_array(client, gc2235_res[dev->fmt_idx].regs);
 761         if (ret) {
 762                 dev_err(&client->dev, "gc2235 write register err.\n");
 763                 return ret;
 764         }
 765         is_init = 0;
 766
 767         return ret;
 768 }
 769
 770 static int gc2235_set_fmt(struct v4l2_subdev *sd,
 771                           struct v4l2_subdev_pad_config *cfg,
 772                           struct v4l2_subdev_format *format)
 773 {
 774
 775         struct v4l2_mbus_framefmt *fmt = &format->format;
 776         struct gc2235_device *dev = to_gc2235_sensor(sd);
 777         struct i2c_client *client = v4l2_get_subdevdata(sd);
 778         struct camera_mipi_info *gc2235_info = NULL;
 779         int ret = 0;
 780         int idx;
 781
 782         gc2235_info = v4l2_get_subdev_hostdata(sd);
 783         if (!gc2235_info)
 784                 return -EINVAL;
 785         if (format->pad)
 786                 return -EINVAL;
 787         if (!fmt)
 788                 return -EINVAL;
 789         mutex_lock(&dev->input_lock);
 790         idx = nearest_resolution_index(fmt->width, fmt->height);
 791         if (idx == -1) {
 792                 /* return the largest resolution */
 793                 fmt->width = gc2235_res[N_RES - 1].width;
 794                 fmt->height = gc2235_res[N_RES - 1].height;
 795         } else {
 796                 fmt->width = gc2235_res[idx].width;
 797                 fmt->height = gc2235_res[idx].height;
 798         }
 799         fmt->code = MEDIA_BUS_FMT_SGRBG10_1X10;
 800         if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
 801                 cfg->try_fmt = *fmt;
 802                 mutex_unlock(&dev->input_lock);
 803                 return 0;
 804         }
 805
 806         dev->fmt_idx = get_resolution_index(fmt->width, fmt->height);
 807         if (dev->fmt_idx == -1) {
 808                 dev_err(&client->dev, "get resolution fail\n");
 809                 mutex_unlock(&dev->input_lock);
 810                 return -EINVAL;
 811         }
 812
 813         ret = startup(sd);
 814         if (ret) {
 815                 dev_err(&client->dev, "gc2235 startup err\n");
 816                 goto err;
 817         }
 818
 819         ret = gc2235_get_intg_factor(client, gc2235_info,
 820                                      &gc2235_res[dev->fmt_idx]);
 821         if (ret)
 822                 dev_err(&client->dev, "failed to get integration_factor\n");
 823
 824 err:
 825         mutex_unlock(&dev->input_lock);
 826         return ret;
 827 }
 828
 829 static int gc2235_get_fmt(struct v4l2_subdev *sd,
 830                           struct v4l2_subdev_pad_config *cfg,
 831                           struct v4l2_subdev_format *format)
 832 {
 833         struct v4l2_mbus_framefmt *fmt = &format->format;
 834         struct gc2235_device *dev = to_gc2235_sensor(sd);
 835
 836         if (format->pad)
 837                 return -EINVAL;
 838
 839         if (!fmt)
 840                 return -EINVAL;
 841
 842         fmt->width = gc2235_res[dev->fmt_idx].width;
 843         fmt->height = gc2235_res[dev->fmt_idx].height;
 844         fmt->code = MEDIA_BUS_FMT_SGRBG10_1X10;
 845
 846         return 0;
 847 }
 848
 849 static int gc2235_detect(struct i2c_client *client)
 850 {
 851         struct i2c_adapter *adapter = client->adapter;
 852         u16 high, low;
 853         int ret;
 854         u16 id;
 855
 856         if (!i2c_check_functionality(adapter, I2C_FUNC_I2C))
 857                 return -ENODEV;
 858
 859         ret = gc2235_read_reg(client, GC2235_8BIT,
 860                                         GC2235_SENSOR_ID_H, &high);
 861         if (ret) {
 862                 dev_err(&client->dev, "sensor_id_high = 0x%x\n", high);
 863                 return -ENODEV;
 864         }
 865         ret = gc2235_read_reg(client, GC2235_8BIT,
 866                                         GC2235_SENSOR_ID_L, &low);
 867         id = ((high << 8) | low);
 868
 869         if (id != GC2235_ID) {
 870                 dev_err(&client->dev, "sensor ID error, 0x%x\n", id);
 871                 return -ENODEV;
 872         }
 873
 874         dev_info(&client->dev, "detect gc2235 success\n");
 875         return 0;
 876 }
 877
 878 static int gc2235_s_stream(struct v4l2_subdev *sd, int enable)
 879 {
 880         struct gc2235_device *dev = to_gc2235_sensor(sd);
 881         struct i2c_client *client = v4l2_get_subdevdata(sd);
 882         int ret;
 883         mutex_lock(&dev->input_lock);
 884
 885         if (enable)
 886                 ret = gc2235_write_reg_array(client, gc2235_stream_on);
 887         else
 888                 ret = gc2235_write_reg_array(client, gc2235_stream_off);
 889
 890         mutex_unlock(&dev->input_lock);
 891         return ret;
 892 }
 893
 894
 895 static int gc2235_s_config(struct v4l2_subdev *sd,
 896                            int irq, void *platform_data)
 897 {
 898         struct gc2235_device *dev = to_gc2235_sensor(sd);
 899         struct i2c_client *client = v4l2_get_subdevdata(sd);
 900         int ret = 0;
 901
 902         if (!platform_data)
 903                 return -ENODEV;
 904
 905         dev->platform_data =
 906                 (struct camera_sensor_platform_data *)platform_data;
 907
 908         mutex_lock(&dev->input_lock);
 909         if (dev->platform_data->platform_init) {
 910                 ret = dev->platform_data->platform_init(client);
 911                 if (ret) {
 912                         dev_err(&client->dev, "platform init err\n");
 913                         goto platform_init_failed;
 914                 }
 915         }
 916         /* power off the module, then power on it in future
 917          * as first power on by board may not fulfill the
 918          * power on sequqence needed by the module
 919          */
 920         ret = power_down(sd);
 921         if (ret) {
 922                 dev_err(&client->dev, "gc2235 power-off err.\n");
 923                 goto fail_power_off;
 924         }
 925
 926         ret = power_up(sd);
 927         if (ret) {
 928                 dev_err(&client->dev, "gc2235 power-up err.\n");
 929                 goto fail_power_on;
 930         }
 931
 932         ret = dev->platform_data->csi_cfg(sd, 1);
 933         if (ret)
 934                 goto fail_csi_cfg;
 935
 936         /* config & detect sensor */
 937         ret = gc2235_detect(client);
 938         if (ret) {
 939                 dev_err(&client->dev, "gc2235_detect err s_config.\n");
 940                 goto fail_csi_cfg;
 941         }
 942
 943         /* turn off sensor, after probed */
 944         ret = power_down(sd);
 945         if (ret) {
 946                 dev_err(&client->dev, "gc2235 power-off err.\n");
 947                 goto fail_csi_cfg;
 948         }
 949         mutex_unlock(&dev->input_lock);
 950
 951         return 0;
 952
 953 fail_csi_cfg:
 954         dev->platform_data->csi_cfg(sd, 0);
 955 fail_power_on:
 956         power_down(sd);
 957         dev_err(&client->dev, "sensor power-gating failed\n");
 958 fail_power_off:
 959         if (dev->platform_data->platform_deinit)
 960                 dev->platform_data->platform_deinit();
 961 platform_init_failed:
 962         mutex_unlock(&dev->input_lock);
 963         return ret;
 964 }
 965
 966 static int gc2235_g_parm(struct v4l2_subdev *sd,
 967                         struct v4l2_streamparm *param)
 968 {
 969         struct gc2235_device *dev = to_gc2235_sensor(sd);
 970         struct i2c_client *client = v4l2_get_subdevdata(sd);
 971
 972         if (!param)
 973                 return -EINVAL;
 974
 975         if (param->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
 976                 dev_err(&client->dev,  "unsupported buffer type.\n");
 977                 return -EINVAL;
 978         }
 979
 980         memset(param, 0, sizeof(*param));
 981         param->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 982
 983         if (dev->fmt_idx >= 0 && dev->fmt_idx < N_RES) {
 984                 param->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
 985                 param->parm.capture.timeperframe.numerator = 1;
 986                 param->parm.capture.capturemode = dev->run_mode;
 987                 param->parm.capture.timeperframe.denominator =
 988                         gc2235_res[dev->fmt_idx].fps;
 989         }
 990         return 0;
 991 }
 992
 993 static int gc2235_s_parm(struct v4l2_subdev *sd,
 994                         struct v4l2_streamparm *param)
 995 {
 996         struct gc2235_device *dev = to_gc2235_sensor(sd);
 997         dev->run_mode = param->parm.capture.capturemode;
 998
 999         mutex_lock(&dev->input_lock);
1000         switch (dev->run_mode) {
1001         case CI_MODE_VIDEO:
1002                 gc2235_res = gc2235_res_video;
1003                 N_RES = N_RES_VIDEO;
1004                 break;
1005         case CI_MODE_STILL_CAPTURE:
1006                 gc2235_res = gc2235_res_still;
1007                 N_RES = N_RES_STILL;
1008                 break;
1009         default:
1010                 gc2235_res = gc2235_res_preview;
1011                 N_RES = N_RES_PREVIEW;
1012         }
1013         mutex_unlock(&dev->input_lock);
1014         return 0;
1015 }
1016
1017 static int gc2235_g_frame_interval(struct v4l2_subdev *sd,
1018                                    struct v4l2_subdev_frame_interval *interval)
1019 {
1020         struct gc2235_device *dev = to_gc2235_sensor(sd);
1021
1022         interval->interval.numerator = 1;
1023         interval->interval.denominator = gc2235_res[dev->fmt_idx].fps;
1024
1025         return 0;
1026 }
1027
1028 static int gc2235_enum_mbus_code(struct v4l2_subdev *sd,
1029                                 struct v4l2_subdev_pad_config *cfg,
1030                                 struct v4l2_subdev_mbus_code_enum *code)
1031 {
1032         if (code->index >= MAX_FMTS)
1033                 return -EINVAL;
1034
1035         code->code = MEDIA_BUS_FMT_SBGGR10_1X10;
1036         return 0;
1037 }
1038
1039 static int gc2235_enum_frame_size(struct v4l2_subdev *sd,
1040                                   struct v4l2_subdev_pad_config *cfg,
1041                                   struct v4l2_subdev_frame_size_enum *fse)
1042 {
1043         int index = fse->index;
1044
1045         if (index >= N_RES)
1046                 return -EINVAL;
1047
1048         fse->min_width = gc2235_res[index].width;
1049         fse->min_height = gc2235_res[index].height;
1050         fse->max_width = gc2235_res[index].width;
1051         fse->max_height = gc2235_res[index].height;
1052
1053         return 0;
1054
1055 }
1056
1057 static int gc2235_g_skip_frames(struct v4l2_subdev *sd, u32 *frames)
1058 {
1059         struct gc2235_device *dev = to_gc2235_sensor(sd);
1060
1061         mutex_lock(&dev->input_lock);
1062         *frames = gc2235_res[dev->fmt_idx].skip_frames;
1063         mutex_unlock(&dev->input_lock);
1064
1065         return 0;
1066 }
1067
1068 static const struct v4l2_subdev_sensor_ops gc2235_sensor_ops = {
1069         .g_skip_frames  = gc2235_g_skip_frames,
1070 };
1071
1072 static const struct v4l2_subdev_video_ops gc2235_video_ops = {
1073         .s_stream = gc2235_s_stream,
1074         .g_parm = gc2235_g_parm,
1075         .s_parm = gc2235_s_parm,
1076         .g_frame_interval = gc2235_g_frame_interval,
1077 };
1078
1079 static const struct v4l2_subdev_core_ops gc2235_core_ops = {
1080         .s_power = gc2235_s_power,
1081         .ioctl = gc2235_ioctl,
1082 };
1083
1084 static const struct v4l2_subdev_pad_ops gc2235_pad_ops = {
1085         .enum_mbus_code = gc2235_enum_mbus_code,
1086         .enum_frame_size = gc2235_enum_frame_size,
1087         .get_fmt = gc2235_get_fmt,
1088         .set_fmt = gc2235_set_fmt,
1089 };
1090
1091 static const struct v4l2_subdev_ops gc2235_ops = {
1092         .core = &gc2235_core_ops,
1093         .video = &gc2235_video_ops,
1094         .pad = &gc2235_pad_ops,
1095         .sensor = &gc2235_sensor_ops,
1096 };
1097
1098 static int gc2235_remove(struct i2c_client *client)
1099 {
1100         struct v4l2_subdev *sd = i2c_get_clientdata(client);
1101         struct gc2235_device *dev = to_gc2235_sensor(sd);
1102         dev_dbg(&client->dev, "gc2235_remove...\n");
1103
1104         if (dev->platform_data->platform_deinit)
1105                 dev->platform_data->platform_deinit();
1106
1107         dev->platform_data->csi_cfg(sd, 0);
1108
1109         v4l2_device_unregister_subdev(sd);
1110         media_entity_cleanup(&dev->sd.entity);
1111         v4l2_ctrl_handler_free(&dev->ctrl_handler);
1112         kfree(dev);
1113
1114         return 0;
1115 }
1116
1117 static int gc2235_probe(struct i2c_client *client,
1118                         const struct i2c_device_id *id)
1119 {
1120         struct gc2235_device *dev;
1121         void *gcpdev;
1122         int ret;
1123         unsigned int i;
1124
1125         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1126         if (!dev) {
1127                 dev_err(&client->dev, "out of memory\n");
1128                 return -ENOMEM;
1129         }
1130
1131         mutex_init(&dev->input_lock);
1132
1133         dev->fmt_idx = 0;
1134         v4l2_i2c_subdev_init(&(dev->sd), client, &gc2235_ops);
1135
1136         gcpdev = client->dev.platform_data;
1137         if (ACPI_COMPANION(&client->dev))
1138                 gcpdev = gmin_camera_platform_data(&dev->sd,
1139                                    ATOMISP_INPUT_FORMAT_RAW_10,
1140                                    atomisp_bayer_order_grbg);
1141
1142         ret = gc2235_s_config(&dev->sd, client->irq, gcpdev);
1143         if (ret)
1144                 goto out_free;
1145
1146         dev->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
1147         dev->pad.flags = MEDIA_PAD_FL_SOURCE;
1148         dev->format.code = MEDIA_BUS_FMT_SBGGR10_1X10;
1149         dev->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
1150         ret =
1151             v4l2_ctrl_handler_init(&dev->ctrl_handler,
1152                                    ARRAY_SIZE(gc2235_controls));
1153         if (ret) {
1154                 gc2235_remove(client);
1155                 return ret;
1156         }
1157
1158         for (i = 0; i < ARRAY_SIZE(gc2235_controls); i++)
1159                 v4l2_ctrl_new_custom(&dev->ctrl_handler, &gc2235_controls[i],
1160                                      NULL);
1161
1162         if (dev->ctrl_handler.error) {
1163                 gc2235_remove(client);
1164                 return dev->ctrl_handler.error;
1165         }
1166
1167         /* Use same lock for controls as for everything else. */
1168         dev->ctrl_handler.lock = &dev->input_lock;
1169         dev->sd.ctrl_handler = &dev->ctrl_handler;
1170
1171         ret = media_entity_pads_init(&dev->sd.entity, 1, &dev->pad);
1172         if (ret)
1173                 gc2235_remove(client);
1174
1175         if (ACPI_HANDLE(&client->dev))
1176                 ret = atomisp_register_i2c_module(&dev->sd, gcpdev, RAW_CAMERA);
1177
1178         return ret;
1179 out_free:
1180         v4l2_device_unregister_subdev(&dev->sd);
1181         kfree(dev);
1182
1183         return ret;
1184 }
1185
1186 static struct acpi_device_id gc2235_acpi_match[] = {
1187         { "INT33F8" },
1188         {},
1189 };
1190
1191 MODULE_DEVICE_TABLE(acpi, gc2235_acpi_match);
1192 MODULE_DEVICE_TABLE(i2c, gc2235_id);
1193 static struct i2c_driver gc2235_driver = {
1194         .driver = {
1195                 .name = GC2235_NAME,
1196                 .acpi_match_table = ACPI_PTR(gc2235_acpi_match),
1197         },
1198         .probe = gc2235_probe,
1199         .remove = gc2235_remove,
1200         .id_table = gc2235_id,
1201 };
1202
1203 static int init_gc2235(void)
1204 {
1205         return i2c_add_driver(&gc2235_driver);
1206 }
1207
1208 static void exit_gc2235(void)
1209 {
1210
1211         i2c_del_driver(&gc2235_driver);
1212 }
1213
1214 module_init(init_gc2235);
1215 module_exit(exit_gc2235);
1216
1217 MODULE_AUTHOR("Shuguang Gong <Shuguang.Gong@intel.com>");
1218 MODULE_DESCRIPTION("A low-level driver for GC2235 sensors");
1219 MODULE_LICENSE("GPL");