drivers/media/i2c/imx208.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 // Copyright (C) 2021 Intel Corporation
   3
   4 #include <linux/acpi.h>
   5 #include <linux/delay.h>
   6 #include <linux/i2c.h>
   7 #include <linux/module.h>
   8 #include <linux/pm_runtime.h>
   9 #include <media/v4l2-ctrls.h>
  10 #include <media/v4l2-device.h>
  11 #include <asm/unaligned.h>
  12
  13 #define IMX208_REG_MODE_SELECT          0x0100
  14 #define IMX208_MODE_STANDBY             0x00
  15 #define IMX208_MODE_STREAMING           0x01
  16
  17 /* Chip ID */
  18 #define IMX208_REG_CHIP_ID              0x0000
  19 #define IMX208_CHIP_ID                  0x0208
  20
  21 /* V_TIMING internal */
  22 #define IMX208_REG_VTS                  0x0340
  23 #define IMX208_VTS_60FPS                0x0472
  24 #define IMX208_VTS_BINNING              0x0239
  25 #define IMX208_VTS_60FPS_MIN            0x0458
  26 #define IMX208_VTS_BINNING_MIN          0x0230
  27 #define IMX208_VTS_MAX                  0xffff
  28
  29 /* HBLANK control - read only */
  30 #define IMX208_PPL_384MHZ               2248
  31 #define IMX208_PPL_96MHZ                2248
  32
  33 /* Exposure control */
  34 #define IMX208_REG_EXPOSURE             0x0202
  35 #define IMX208_EXPOSURE_MIN             4
  36 #define IMX208_EXPOSURE_STEP            1
  37 #define IMX208_EXPOSURE_DEFAULT         0x190
  38 #define IMX208_EXPOSURE_MAX             65535
  39
  40 /* Analog gain control */
  41 #define IMX208_REG_ANALOG_GAIN          0x0204
  42 #define IMX208_ANA_GAIN_MIN             0
  43 #define IMX208_ANA_GAIN_MAX             0x00e0
  44 #define IMX208_ANA_GAIN_STEP            1
  45 #define IMX208_ANA_GAIN_DEFAULT         0x0
  46
  47 /* Digital gain control */
  48 #define IMX208_REG_GR_DIGITAL_GAIN      0x020e
  49 #define IMX208_REG_R_DIGITAL_GAIN       0x0210
  50 #define IMX208_REG_B_DIGITAL_GAIN       0x0212
  51 #define IMX208_REG_GB_DIGITAL_GAIN      0x0214
  52 #define IMX208_DIGITAL_GAIN_SHIFT       8
  53
  54 /* Orientation */
  55 #define IMX208_REG_ORIENTATION_CONTROL  0x0101
  56
  57 /* Test Pattern Control */
  58 #define IMX208_REG_TEST_PATTERN_MODE    0x0600
  59 #define IMX208_TEST_PATTERN_DISABLE     0x0
  60 #define IMX208_TEST_PATTERN_SOLID_COLOR 0x1
  61 #define IMX208_TEST_PATTERN_COLOR_BARS  0x2
  62 #define IMX208_TEST_PATTERN_GREY_COLOR  0x3
  63 #define IMX208_TEST_PATTERN_PN9         0x4
  64 #define IMX208_TEST_PATTERN_FIX_1       0x100
  65 #define IMX208_TEST_PATTERN_FIX_2       0x101
  66 #define IMX208_TEST_PATTERN_FIX_3       0x102
  67 #define IMX208_TEST_PATTERN_FIX_4       0x103
  68 #define IMX208_TEST_PATTERN_FIX_5       0x104
  69 #define IMX208_TEST_PATTERN_FIX_6       0x105
  70
  71 /* OTP Access */
  72 #define IMX208_OTP_BASE                 0x3500
  73 #define IMX208_OTP_SIZE                 40
  74
  75 struct imx208_reg {
  76         u16 address;
  77         u8 val;
  78 };
  79
  80 struct imx208_reg_list {
  81         u32 num_of_regs;
  82         const struct imx208_reg *regs;
  83 };
  84
  85 /* Link frequency config */
  86 struct imx208_link_freq_config {
  87         u32 pixels_per_line;
  88
  89         /* PLL registers for this link frequency */
  90         struct imx208_reg_list reg_list;
  91 };
  92
  93 /* Mode : resolution and related config&values */
  94 struct imx208_mode {
  95         /* Frame width */
  96         u32 width;
  97         /* Frame height */
  98         u32 height;
  99
 100         /* V-timing */
 101         u32 vts_def;
 102         u32 vts_min;
 103
 104         /* Index of Link frequency config to be used */
 105         u32 link_freq_index;
 106         /* Default register values */
 107         struct imx208_reg_list reg_list;
 108 };
 109
 110 static const struct imx208_reg pll_ctrl_reg[] = {
 111         {0x0305, 0x02},
 112         {0x0307, 0x50},
 113         {0x303C, 0x3C},
 114 };
 115
 116 static const struct imx208_reg mode_1936x1096_60fps_regs[] = {
 117         {0x0340, 0x04},
 118         {0x0341, 0x72},
 119         {0x0342, 0x04},
 120         {0x0343, 0x64},
 121         {0x034C, 0x07},
 122         {0x034D, 0x90},
 123         {0x034E, 0x04},
 124         {0x034F, 0x48},
 125         {0x0381, 0x01},
 126         {0x0383, 0x01},
 127         {0x0385, 0x01},
 128         {0x0387, 0x01},
 129         {0x3048, 0x00},
 130         {0x3050, 0x01},
 131         {0x30D5, 0x00},
 132         {0x3301, 0x00},
 133         {0x3318, 0x62},
 134         {0x0202, 0x01},
 135         {0x0203, 0x90},
 136         {0x0205, 0x00},
 137 };
 138
 139 static const struct imx208_reg mode_968_548_60fps_regs[] = {
 140         {0x0340, 0x02},
 141         {0x0341, 0x39},
 142         {0x0342, 0x08},
 143         {0x0343, 0xC8},
 144         {0x034C, 0x03},
 145         {0x034D, 0xC8},
 146         {0x034E, 0x02},
 147         {0x034F, 0x24},
 148         {0x0381, 0x01},
 149         {0x0383, 0x03},
 150         {0x0385, 0x01},
 151         {0x0387, 0x03},
 152         {0x3048, 0x01},
 153         {0x3050, 0x02},
 154         {0x30D5, 0x03},
 155         {0x3301, 0x10},
 156         {0x3318, 0x75},
 157         {0x0202, 0x01},
 158         {0x0203, 0x90},
 159         {0x0205, 0x00},
 160 };
 161
 162 static const s64 imx208_discrete_digital_gain[] = {
 163         1, 2, 4, 8, 16,
 164 };
 165
 166 static const char * const imx208_test_pattern_menu[] = {
 167         "Disabled",
 168         "Solid Color",
 169         "100% Color Bar",
 170         "Fade to Grey Color Bar",
 171         "PN9",
 172         "Fixed Pattern1",
 173         "Fixed Pattern2",
 174         "Fixed Pattern3",
 175         "Fixed Pattern4",
 176         "Fixed Pattern5",
 177         "Fixed Pattern6"
 178 };
 179
 180 static const int imx208_test_pattern_val[] = {
 181         IMX208_TEST_PATTERN_DISABLE,
 182         IMX208_TEST_PATTERN_SOLID_COLOR,
 183         IMX208_TEST_PATTERN_COLOR_BARS,
 184         IMX208_TEST_PATTERN_GREY_COLOR,
 185         IMX208_TEST_PATTERN_PN9,
 186         IMX208_TEST_PATTERN_FIX_1,
 187         IMX208_TEST_PATTERN_FIX_2,
 188         IMX208_TEST_PATTERN_FIX_3,
 189         IMX208_TEST_PATTERN_FIX_4,
 190         IMX208_TEST_PATTERN_FIX_5,
 191         IMX208_TEST_PATTERN_FIX_6,
 192 };
 193
 194 /* Configurations for supported link frequencies */
 195 #define IMX208_MHZ                      (1000 * 1000ULL)
 196 #define IMX208_LINK_FREQ_384MHZ         (384ULL * IMX208_MHZ)
 197 #define IMX208_LINK_FREQ_96MHZ          (96ULL * IMX208_MHZ)
 198
 199 #define IMX208_DATA_RATE_DOUBLE         2
 200 #define IMX208_NUM_OF_LANES             2
 201 #define IMX208_PIXEL_BITS               10
 202
 203 enum {
 204         IMX208_LINK_FREQ_384MHZ_INDEX,
 205         IMX208_LINK_FREQ_96MHZ_INDEX,
 206 };
 207
 208 /*
 209  * pixel_rate = link_freq * data-rate * nr_of_lanes / bits_per_sample
 210  * data rate => double data rate; number of lanes => 2; bits per pixel => 10
 211  */
 212 static u64 link_freq_to_pixel_rate(u64 f)
 213 {
 214         f *= IMX208_DATA_RATE_DOUBLE * IMX208_NUM_OF_LANES;
 215         do_div(f, IMX208_PIXEL_BITS);
 216
 217         return f;
 218 }
 219
 220 /* Menu items for LINK_FREQ V4L2 control */
 221 static const s64 link_freq_menu_items[] = {
 222         [IMX208_LINK_FREQ_384MHZ_INDEX] = IMX208_LINK_FREQ_384MHZ,
 223         [IMX208_LINK_FREQ_96MHZ_INDEX] = IMX208_LINK_FREQ_96MHZ,
 224 };
 225
 226 /* Link frequency configs */
 227 static const struct imx208_link_freq_config link_freq_configs[] = {
 228         [IMX208_LINK_FREQ_384MHZ_INDEX] = {
 229                 .pixels_per_line = IMX208_PPL_384MHZ,
 230                 .reg_list = {
 231                         .num_of_regs = ARRAY_SIZE(pll_ctrl_reg),
 232                         .regs = pll_ctrl_reg,
 233                 }
 234         },
 235         [IMX208_LINK_FREQ_96MHZ_INDEX] = {
 236                 .pixels_per_line = IMX208_PPL_96MHZ,
 237                 .reg_list = {
 238                         .num_of_regs = ARRAY_SIZE(pll_ctrl_reg),
 239                         .regs = pll_ctrl_reg,
 240                 }
 241         },
 242 };
 243
 244 /* Mode configs */
 245 static const struct imx208_mode supported_modes[] = {
 246         {
 247                 .width = 1936,
 248                 .height = 1096,
 249                 .vts_def = IMX208_VTS_60FPS,
 250                 .vts_min = IMX208_VTS_60FPS_MIN,
 251                 .reg_list = {
 252                         .num_of_regs = ARRAY_SIZE(mode_1936x1096_60fps_regs),
 253                         .regs = mode_1936x1096_60fps_regs,
 254                 },
 255                 .link_freq_index = IMX208_LINK_FREQ_384MHZ_INDEX,
 256         },
 257         {
 258                 .width = 968,
 259                 .height = 548,
 260                 .vts_def = IMX208_VTS_BINNING,
 261                 .vts_min = IMX208_VTS_BINNING_MIN,
 262                 .reg_list = {
 263                         .num_of_regs = ARRAY_SIZE(mode_968_548_60fps_regs),
 264                         .regs = mode_968_548_60fps_regs,
 265                 },
 266                 .link_freq_index = IMX208_LINK_FREQ_96MHZ_INDEX,
 267         },
 268 };
 269
 270 struct imx208 {
 271         struct v4l2_subdev sd;
 272         struct media_pad pad;
 273
 274         struct v4l2_ctrl_handler ctrl_handler;
 275         /* V4L2 Controls */
 276         struct v4l2_ctrl *link_freq;
 277         struct v4l2_ctrl *pixel_rate;
 278         struct v4l2_ctrl *vblank;
 279         struct v4l2_ctrl *hblank;
 280         struct v4l2_ctrl *vflip;
 281         struct v4l2_ctrl *hflip;
 282
 283         /* Current mode */
 284         const struct imx208_mode *cur_mode;
 285
 286         /*
 287          * Mutex for serialized access:
 288          * Protect sensor set pad format and start/stop streaming safely.
 289          * Protect access to sensor v4l2 controls.
 290          */
 291         struct mutex imx208_mx;
 292
 293         /* Streaming on/off */
 294         bool streaming;
 295
 296         /* OTP data */
 297         bool otp_read;
 298         char otp_data[IMX208_OTP_SIZE];
 299
 300         /* True if the device has been identified */
 301         bool identified;
 302 };
 303
 304 static inline struct imx208 *to_imx208(struct v4l2_subdev *_sd)
 305 {
 306         return container_of(_sd, struct imx208, sd);
 307 }
 308
 309 /* Get bayer order based on flip setting. */
 310 static u32 imx208_get_format_code(struct imx208 *imx208)
 311 {
 312         /*
 313          * Only one bayer order is supported.
 314          * It depends on the flip settings.
 315          */
 316         static const u32 codes[2][2] = {
 317                 { MEDIA_BUS_FMT_SRGGB10_1X10, MEDIA_BUS_FMT_SGRBG10_1X10, },
 318                 { MEDIA_BUS_FMT_SGBRG10_1X10, MEDIA_BUS_FMT_SBGGR10_1X10, },
 319         };
 320
 321         return codes[imx208->vflip->val][imx208->hflip->val];
 322 }
 323
 324 /* Read registers up to 4 at a time */
 325 static int imx208_read_reg(struct imx208 *imx208, u16 reg, u32 len, u32 *val)
 326 {
 327         struct i2c_client *client = v4l2_get_subdevdata(&imx208->sd);
 328         struct i2c_msg msgs[2];
 329         u8 addr_buf[2] = { reg >> 8, reg & 0xff };
 330         u8 data_buf[4] = { 0, };
 331         int ret;
 332
 333         if (len > 4)
 334                 return -EINVAL;
 335
 336         /* Write register address */
 337         msgs[0].addr = client->addr;
 338         msgs[0].flags = 0;
 339         msgs[0].len = ARRAY_SIZE(addr_buf);
 340         msgs[0].buf = addr_buf;
 341
 342         /* Read data from register */
 343         msgs[1].addr = client->addr;
 344         msgs[1].flags = I2C_M_RD;
 345         msgs[1].len = len;
 346         msgs[1].buf = &data_buf[4 - len];
 347
 348         ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
 349         if (ret != ARRAY_SIZE(msgs))
 350                 return -EIO;
 351
 352         *val = get_unaligned_be32(data_buf);
 353
 354         return 0;
 355 }
 356
 357 /* Write registers up to 4 at a time */
 358 static int imx208_write_reg(struct imx208 *imx208, u16 reg, u32 len, u32 val)
 359 {
 360         struct i2c_client *client = v4l2_get_subdevdata(&imx208->sd);
 361         u8 buf[6];
 362
 363         if (len > 4)
 364                 return -EINVAL;
 365
 366         put_unaligned_be16(reg, buf);
 367         put_unaligned_be32(val << (8 * (4 - len)), buf + 2);
 368         if (i2c_master_send(client, buf, len + 2) != len + 2)
 369                 return -EIO;
 370
 371         return 0;
 372 }
 373
 374 /* Write a list of registers */
 375 static int imx208_write_regs(struct imx208 *imx208,
 376                              const struct imx208_reg *regs, u32 len)
 377 {
 378         struct i2c_client *client = v4l2_get_subdevdata(&imx208->sd);
 379         unsigned int i;
 380         int ret;
 381
 382         for (i = 0; i < len; i++) {
 383                 ret = imx208_write_reg(imx208, regs[i].address, 1,
 384                                        regs[i].val);
 385                 if (ret) {
 386                         dev_err_ratelimited(&client->dev,
 387                                             "Failed to write reg 0x%4.4x. error = %d\n",
 388                                             regs[i].address, ret);
 389
 390                         return ret;
 391                 }
 392         }
 393
 394         return 0;
 395 }
 396
 397 /* Open sub-device */
 398 static int imx208_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
 399 {
 400         struct v4l2_mbus_framefmt *try_fmt =
 401                 v4l2_subdev_get_try_format(sd, fh->state, 0);
 402
 403         /* Initialize try_fmt */
 404         try_fmt->width = supported_modes[0].width;
 405         try_fmt->height = supported_modes[0].height;
 406         try_fmt->code = MEDIA_BUS_FMT_SRGGB10_1X10;
 407         try_fmt->field = V4L2_FIELD_NONE;
 408
 409         return 0;
 410 }
 411
 412 static int imx208_update_digital_gain(struct imx208 *imx208, u32 len, u32 val)
 413 {
 414         int ret;
 415
 416         val = imx208_discrete_digital_gain[val] << IMX208_DIGITAL_GAIN_SHIFT;
 417
 418         ret = imx208_write_reg(imx208, IMX208_REG_GR_DIGITAL_GAIN, 2, val);
 419         if (ret)
 420                 return ret;
 421
 422         ret = imx208_write_reg(imx208, IMX208_REG_GB_DIGITAL_GAIN, 2, val);
 423         if (ret)
 424                 return ret;
 425
 426         ret = imx208_write_reg(imx208, IMX208_REG_R_DIGITAL_GAIN, 2, val);
 427         if (ret)
 428                 return ret;
 429
 430         return imx208_write_reg(imx208, IMX208_REG_B_DIGITAL_GAIN, 2, val);
 431 }
 432
 433 static int imx208_set_ctrl(struct v4l2_ctrl *ctrl)
 434 {
 435         struct imx208 *imx208 =
 436                 container_of(ctrl->handler, struct imx208, ctrl_handler);
 437         struct i2c_client *client = v4l2_get_subdevdata(&imx208->sd);
 438         int ret;
 439
 440         /*
 441          * Applying V4L2 control value only happens
 442          * when power is up for streaming
 443          */
 444         if (!pm_runtime_get_if_in_use(&client->dev))
 445                 return 0;
 446
 447         switch (ctrl->id) {
 448         case V4L2_CID_ANALOGUE_GAIN:
 449                 ret = imx208_write_reg(imx208, IMX208_REG_ANALOG_GAIN,
 450                                        2, ctrl->val);
 451                 break;
 452         case V4L2_CID_EXPOSURE:
 453                 ret = imx208_write_reg(imx208, IMX208_REG_EXPOSURE,
 454                                        2, ctrl->val);
 455                 break;
 456         case V4L2_CID_DIGITAL_GAIN:
 457                 ret = imx208_update_digital_gain(imx208, 2, ctrl->val);
 458                 break;
 459         case V4L2_CID_VBLANK:
 460                 /* Update VTS that meets expected vertical blanking */
 461                 ret = imx208_write_reg(imx208, IMX208_REG_VTS, 2,
 462                                        imx208->cur_mode->height + ctrl->val);
 463                 break;
 464         case V4L2_CID_TEST_PATTERN:
 465                 ret = imx208_write_reg(imx208, IMX208_REG_TEST_PATTERN_MODE,
 466                                        2, imx208_test_pattern_val[ctrl->val]);
 467                 break;
 468         case V4L2_CID_HFLIP:
 469         case V4L2_CID_VFLIP:
 470                 ret = imx208_write_reg(imx208, IMX208_REG_ORIENTATION_CONTROL,
 471                                        1,
 472                                        imx208->hflip->val |
 473                                        imx208->vflip->val << 1);
 474                 break;
 475         default:
 476                 ret = -EINVAL;
 477                 dev_err(&client->dev,
 478                         "ctrl(id:0x%x,val:0x%x) is not handled\n",
 479                         ctrl->id, ctrl->val);
 480                 break;
 481         }
 482
 483         pm_runtime_put(&client->dev);
 484
 485         return ret;
 486 }
 487
 488 static const struct v4l2_ctrl_ops imx208_ctrl_ops = {
 489         .s_ctrl = imx208_set_ctrl,
 490 };
 491
 492 static const struct v4l2_ctrl_config imx208_digital_gain_control = {
 493         .ops = &imx208_ctrl_ops,
 494         .id = V4L2_CID_DIGITAL_GAIN,
 495         .name = "Digital Gain",
 496         .type = V4L2_CTRL_TYPE_INTEGER_MENU,
 497         .min = 0,
 498         .max = ARRAY_SIZE(imx208_discrete_digital_gain) - 1,
 499         .step = 0,
 500         .def = 0,
 501         .menu_skip_mask = 0,
 502         .qmenu_int = imx208_discrete_digital_gain,
 503 };
 504
 505 static int imx208_enum_mbus_code(struct v4l2_subdev *sd,
 506                                  struct v4l2_subdev_state *sd_state,
 507                                  struct v4l2_subdev_mbus_code_enum *code)
 508 {
 509         struct imx208 *imx208 = to_imx208(sd);
 510
 511         if (code->index > 0)
 512                 return -EINVAL;
 513
 514         code->code = imx208_get_format_code(imx208);
 515
 516         return 0;
 517 }
 518
 519 static int imx208_enum_frame_size(struct v4l2_subdev *sd,
 520                                   struct v4l2_subdev_state *sd_state,
 521                                   struct v4l2_subdev_frame_size_enum *fse)
 522 {
 523         struct imx208 *imx208 = to_imx208(sd);
 524
 525         if (fse->index >= ARRAY_SIZE(supported_modes))
 526                 return -EINVAL;
 527
 528         if (fse->code != imx208_get_format_code(imx208))
 529                 return -EINVAL;
 530
 531         fse->min_width = supported_modes[fse->index].width;
 532         fse->max_width = fse->min_width;
 533         fse->min_height = supported_modes[fse->index].height;
 534         fse->max_height = fse->min_height;
 535
 536         return 0;
 537 }
 538
 539 static void imx208_mode_to_pad_format(struct imx208 *imx208,
 540                                       const struct imx208_mode *mode,
 541                                       struct v4l2_subdev_format *fmt)
 542 {
 543         fmt->format.width = mode->width;
 544         fmt->format.height = mode->height;
 545         fmt->format.code = imx208_get_format_code(imx208);
 546         fmt->format.field = V4L2_FIELD_NONE;
 547 }
 548
 549 static int __imx208_get_pad_format(struct imx208 *imx208,
 550                                    struct v4l2_subdev_state *sd_state,
 551                                    struct v4l2_subdev_format *fmt)
 552 {
 553         if (fmt->which == V4L2_SUBDEV_FORMAT_TRY)
 554                 fmt->format = *v4l2_subdev_get_try_format(&imx208->sd,
 555                                                           sd_state,
 556                                                           fmt->pad);
 557         else
 558                 imx208_mode_to_pad_format(imx208, imx208->cur_mode, fmt);
 559
 560         return 0;
 561 }
 562
 563 static int imx208_get_pad_format(struct v4l2_subdev *sd,
 564                                  struct v4l2_subdev_state *sd_state,
 565                                  struct v4l2_subdev_format *fmt)
 566 {
 567         struct imx208 *imx208 = to_imx208(sd);
 568         int ret;
 569
 570         mutex_lock(&imx208->imx208_mx);
 571         ret = __imx208_get_pad_format(imx208, sd_state, fmt);
 572         mutex_unlock(&imx208->imx208_mx);
 573
 574         return ret;
 575 }
 576
 577 static int imx208_set_pad_format(struct v4l2_subdev *sd,
 578                                  struct v4l2_subdev_state *sd_state,
 579                                  struct v4l2_subdev_format *fmt)
 580 {
 581         struct imx208 *imx208 = to_imx208(sd);
 582         const struct imx208_mode *mode;
 583         s32 vblank_def;
 584         s32 vblank_min;
 585         s64 h_blank;
 586         s64 pixel_rate;
 587         s64 link_freq;
 588
 589         mutex_lock(&imx208->imx208_mx);
 590
 591         fmt->format.code = imx208_get_format_code(imx208);
 592         mode = v4l2_find_nearest_size(supported_modes,
 593                                       ARRAY_SIZE(supported_modes), width, height,
 594                                       fmt->format.width, fmt->format.height);
 595         imx208_mode_to_pad_format(imx208, mode, fmt);
 596         if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
 597                 *v4l2_subdev_get_try_format(sd, sd_state, fmt->pad) = fmt->format;
 598         } else {
 599                 imx208->cur_mode = mode;
 600                 __v4l2_ctrl_s_ctrl(imx208->link_freq, mode->link_freq_index);
 601                 link_freq = link_freq_menu_items[mode->link_freq_index];
 602                 pixel_rate = link_freq_to_pixel_rate(link_freq);
 603                 __v4l2_ctrl_s_ctrl_int64(imx208->pixel_rate, pixel_rate);
 604                 /* Update limits and set FPS to default */
 605                 vblank_def = imx208->cur_mode->vts_def -
 606                              imx208->cur_mode->height;
 607                 vblank_min = imx208->cur_mode->vts_min -
 608                              imx208->cur_mode->height;
 609                 __v4l2_ctrl_modify_range(imx208->vblank, vblank_min,
 610                                          IMX208_VTS_MAX - imx208->cur_mode->height,
 611                                          1, vblank_def);
 612                 __v4l2_ctrl_s_ctrl(imx208->vblank, vblank_def);
 613                 h_blank =
 614                         link_freq_configs[mode->link_freq_index].pixels_per_line
 615                          - imx208->cur_mode->width;
 616                 __v4l2_ctrl_modify_range(imx208->hblank, h_blank,
 617                                          h_blank, 1, h_blank);
 618         }
 619
 620         mutex_unlock(&imx208->imx208_mx);
 621
 622         return 0;
 623 }
 624
 625 static int imx208_identify_module(struct imx208 *imx208)
 626 {
 627         struct i2c_client *client = v4l2_get_subdevdata(&imx208->sd);
 628         int ret;
 629         u32 val;
 630
 631         if (imx208->identified)
 632                 return 0;
 633
 634         ret = imx208_read_reg(imx208, IMX208_REG_CHIP_ID,
 635                               2, &val);
 636         if (ret) {
 637                 dev_err(&client->dev, "failed to read chip id %x\n",
 638                         IMX208_CHIP_ID);
 639                 return ret;
 640         }
 641
 642         if (val != IMX208_CHIP_ID) {
 643                 dev_err(&client->dev, "chip id mismatch: %x!=%x\n",
 644                         IMX208_CHIP_ID, val);
 645                 return -EIO;
 646         }
 647
 648         imx208->identified = true;
 649
 650         return 0;
 651 }
 652
 653 /* Start streaming */
 654 static int imx208_start_streaming(struct imx208 *imx208)
 655 {
 656         struct i2c_client *client = v4l2_get_subdevdata(&imx208->sd);
 657         const struct imx208_reg_list *reg_list;
 658         int ret, link_freq_index;
 659
 660         ret = imx208_identify_module(imx208);
 661         if (ret)
 662                 return ret;
 663
 664         /* Setup PLL */
 665         link_freq_index = imx208->cur_mode->link_freq_index;
 666         reg_list = &link_freq_configs[link_freq_index].reg_list;
 667         ret = imx208_write_regs(imx208, reg_list->regs, reg_list->num_of_regs);
 668         if (ret) {
 669                 dev_err(&client->dev, "%s failed to set plls\n", __func__);
 670                 return ret;
 671         }
 672
 673         /* Apply default values of current mode */
 674         reg_list = &imx208->cur_mode->reg_list;
 675         ret = imx208_write_regs(imx208, reg_list->regs, reg_list->num_of_regs);
 676         if (ret) {
 677                 dev_err(&client->dev, "%s failed to set mode\n", __func__);
 678                 return ret;
 679         }
 680
 681         /* Apply customized values from user */
 682         ret =  __v4l2_ctrl_handler_setup(imx208->sd.ctrl_handler);
 683         if (ret)
 684                 return ret;
 685
 686         /* set stream on register */
 687         return imx208_write_reg(imx208, IMX208_REG_MODE_SELECT,
 688                                 1, IMX208_MODE_STREAMING);
 689 }
 690
 691 /* Stop streaming */
 692 static int imx208_stop_streaming(struct imx208 *imx208)
 693 {
 694         struct i2c_client *client = v4l2_get_subdevdata(&imx208->sd);
 695         int ret;
 696
 697         /* set stream off register */
 698         ret = imx208_write_reg(imx208, IMX208_REG_MODE_SELECT,
 699                                1, IMX208_MODE_STANDBY);
 700         if (ret)
 701                 dev_err(&client->dev, "%s failed to set stream\n", __func__);
 702
 703         /*
 704          * Return success even if it was an error, as there is nothing the
 705          * caller can do about it.
 706          */
 707         return 0;
 708 }
 709
 710 static int imx208_set_stream(struct v4l2_subdev *sd, int enable)
 711 {
 712         struct imx208 *imx208 = to_imx208(sd);
 713         struct i2c_client *client = v4l2_get_subdevdata(sd);
 714         int ret = 0;
 715
 716         mutex_lock(&imx208->imx208_mx);
 717         if (imx208->streaming == enable) {
 718                 mutex_unlock(&imx208->imx208_mx);
 719                 return 0;
 720         }
 721
 722         if (enable) {
 723                 ret = pm_runtime_get_sync(&client->dev);
 724                 if (ret < 0)
 725                         goto err_rpm_put;
 726
 727                 /*
 728                  * Apply default & customized values
 729                  * and then start streaming.
 730                  */
 731                 ret = imx208_start_streaming(imx208);
 732                 if (ret)
 733                         goto err_rpm_put;
 734         } else {
 735                 imx208_stop_streaming(imx208);
 736                 pm_runtime_put(&client->dev);
 737         }
 738
 739         imx208->streaming = enable;
 740         mutex_unlock(&imx208->imx208_mx);
 741
 742         /* vflip and hflip cannot change during streaming */
 743         v4l2_ctrl_grab(imx208->vflip, enable);
 744         v4l2_ctrl_grab(imx208->hflip, enable);
 745
 746         return ret;
 747
 748 err_rpm_put:
 749         pm_runtime_put(&client->dev);
 750         mutex_unlock(&imx208->imx208_mx);
 751
 752         return ret;
 753 }
 754
 755 static int __maybe_unused imx208_suspend(struct device *dev)
 756 {
 757         struct i2c_client *client = to_i2c_client(dev);
 758         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 759         struct imx208 *imx208 = to_imx208(sd);
 760
 761         if (imx208->streaming)
 762                 imx208_stop_streaming(imx208);
 763
 764         return 0;
 765 }
 766
 767 static int __maybe_unused imx208_resume(struct device *dev)
 768 {
 769         struct i2c_client *client = to_i2c_client(dev);
 770         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 771         struct imx208 *imx208 = to_imx208(sd);
 772         int ret;
 773
 774         if (imx208->streaming) {
 775                 ret = imx208_start_streaming(imx208);
 776                 if (ret)
 777                         goto error;
 778         }
 779
 780         return 0;
 781
 782 error:
 783         imx208_stop_streaming(imx208);
 784         imx208->streaming = 0;
 785
 786         return ret;
 787 }
 788
 789 /* Verify chip ID */
 790 static const struct v4l2_subdev_video_ops imx208_video_ops = {
 791         .s_stream = imx208_set_stream,
 792 };
 793
 794 static const struct v4l2_subdev_pad_ops imx208_pad_ops = {
 795         .enum_mbus_code = imx208_enum_mbus_code,
 796         .get_fmt = imx208_get_pad_format,
 797         .set_fmt = imx208_set_pad_format,
 798         .enum_frame_size = imx208_enum_frame_size,
 799 };
 800
 801 static const struct v4l2_subdev_ops imx208_subdev_ops = {
 802         .video = &imx208_video_ops,
 803         .pad = &imx208_pad_ops,
 804 };
 805
 806 static const struct v4l2_subdev_internal_ops imx208_internal_ops = {
 807         .open = imx208_open,
 808 };
 809
 810 static int imx208_read_otp(struct imx208 *imx208)
 811 {
 812         struct i2c_client *client = v4l2_get_subdevdata(&imx208->sd);
 813         struct i2c_msg msgs[2];
 814         u8 addr_buf[2] = { IMX208_OTP_BASE >> 8, IMX208_OTP_BASE & 0xff };
 815         int ret = 0;
 816
 817         mutex_lock(&imx208->imx208_mx);
 818
 819         if (imx208->otp_read)
 820                 goto out_unlock;
 821
 822         ret = pm_runtime_get_sync(&client->dev);
 823         if (ret < 0) {
 824                 pm_runtime_put_noidle(&client->dev);
 825                 goto out_unlock;
 826         }
 827
 828         ret = imx208_identify_module(imx208);
 829         if (ret)
 830                 goto out_pm_put;
 831
 832         /* Write register address */
 833         msgs[0].addr = client->addr;
 834         msgs[0].flags = 0;
 835         msgs[0].len = ARRAY_SIZE(addr_buf);
 836         msgs[0].buf = addr_buf;
 837
 838         /* Read data from registers */
 839         msgs[1].addr = client->addr;
 840         msgs[1].flags = I2C_M_RD;
 841         msgs[1].len = sizeof(imx208->otp_data);
 842         msgs[1].buf = imx208->otp_data;
 843
 844         ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
 845         if (ret == ARRAY_SIZE(msgs)) {
 846                 imx208->otp_read = true;
 847                 ret = 0;
 848         }
 849
 850 out_pm_put:
 851         pm_runtime_put(&client->dev);
 852
 853 out_unlock:
 854         mutex_unlock(&imx208->imx208_mx);
 855
 856         return ret;
 857 }
 858
 859 static ssize_t otp_read(struct file *filp, struct kobject *kobj,
 860                         struct bin_attribute *bin_attr,
 861                         char *buf, loff_t off, size_t count)
 862 {
 863         struct i2c_client *client = to_i2c_client(kobj_to_dev(kobj));
 864         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 865         struct imx208 *imx208 = to_imx208(sd);
 866         int ret;
 867
 868         ret = imx208_read_otp(imx208);
 869         if (ret)
 870                 return ret;
 871
 872         memcpy(buf, &imx208->otp_data[off], count);
 873         return count;
 874 }
 875
 876 static const BIN_ATTR_RO(otp, IMX208_OTP_SIZE);
 877
 878 /* Initialize control handlers */
 879 static int imx208_init_controls(struct imx208 *imx208)
 880 {
 881         struct i2c_client *client = v4l2_get_subdevdata(&imx208->sd);
 882         struct v4l2_ctrl_handler *ctrl_hdlr = &imx208->ctrl_handler;
 883         s64 exposure_max;
 884         s64 vblank_def;
 885         s64 vblank_min;
 886         s64 pixel_rate_min;
 887         s64 pixel_rate_max;
 888         int ret;
 889
 890         ret = v4l2_ctrl_handler_init(ctrl_hdlr, 8);
 891         if (ret)
 892                 return ret;
 893
 894         mutex_init(&imx208->imx208_mx);
 895         ctrl_hdlr->lock = &imx208->imx208_mx;
 896         imx208->link_freq =
 897                 v4l2_ctrl_new_int_menu(ctrl_hdlr,
 898                                        &imx208_ctrl_ops,
 899                                        V4L2_CID_LINK_FREQ,
 900                                        ARRAY_SIZE(link_freq_menu_items) - 1,
 901                                        0, link_freq_menu_items);
 902
 903         if (imx208->link_freq)
 904                 imx208->link_freq->flags |= V4L2_CTRL_FLAG_READ_ONLY;
 905
 906         pixel_rate_max = link_freq_to_pixel_rate(link_freq_menu_items[0]);
 907         pixel_rate_min =
 908                 link_freq_to_pixel_rate(link_freq_menu_items[ARRAY_SIZE(link_freq_menu_items) - 1]);
 909         /* By default, PIXEL_RATE is read only */
 910         imx208->pixel_rate = v4l2_ctrl_new_std(ctrl_hdlr, &imx208_ctrl_ops,
 911                                                V4L2_CID_PIXEL_RATE,
 912                                                pixel_rate_min, pixel_rate_max,
 913                                                1, pixel_rate_max);
 914
 915         vblank_def = imx208->cur_mode->vts_def - imx208->cur_mode->height;
 916         vblank_min = imx208->cur_mode->vts_min - imx208->cur_mode->height;
 917         imx208->vblank =
 918                 v4l2_ctrl_new_std(ctrl_hdlr, &imx208_ctrl_ops, V4L2_CID_VBLANK,
 919                                   vblank_min,
 920                                   IMX208_VTS_MAX - imx208->cur_mode->height, 1,
 921                                   vblank_def);
 922
 923         imx208->hblank =
 924                 v4l2_ctrl_new_std(ctrl_hdlr, &imx208_ctrl_ops, V4L2_CID_HBLANK,
 925                                   IMX208_PPL_384MHZ - imx208->cur_mode->width,
 926                                   IMX208_PPL_384MHZ - imx208->cur_mode->width,
 927                                   1,
 928                                   IMX208_PPL_384MHZ - imx208->cur_mode->width);
 929
 930         if (imx208->hblank)
 931                 imx208->hblank->flags |= V4L2_CTRL_FLAG_READ_ONLY;
 932
 933         exposure_max = imx208->cur_mode->vts_def - 8;
 934         v4l2_ctrl_new_std(ctrl_hdlr, &imx208_ctrl_ops, V4L2_CID_EXPOSURE,
 935                           IMX208_EXPOSURE_MIN, exposure_max,
 936                           IMX208_EXPOSURE_STEP, IMX208_EXPOSURE_DEFAULT);
 937
 938         imx208->hflip = v4l2_ctrl_new_std(ctrl_hdlr, &imx208_ctrl_ops,
 939                                           V4L2_CID_HFLIP, 0, 1, 1, 0);
 940         imx208->vflip = v4l2_ctrl_new_std(ctrl_hdlr, &imx208_ctrl_ops,
 941                                           V4L2_CID_VFLIP, 0, 1, 1, 0);
 942
 943         v4l2_ctrl_new_std(ctrl_hdlr, &imx208_ctrl_ops, V4L2_CID_ANALOGUE_GAIN,
 944                           IMX208_ANA_GAIN_MIN, IMX208_ANA_GAIN_MAX,
 945                           IMX208_ANA_GAIN_STEP, IMX208_ANA_GAIN_DEFAULT);
 946
 947         v4l2_ctrl_new_custom(ctrl_hdlr, &imx208_digital_gain_control, NULL);
 948
 949         v4l2_ctrl_new_std_menu_items(ctrl_hdlr, &imx208_ctrl_ops,
 950                                      V4L2_CID_TEST_PATTERN,
 951                                      ARRAY_SIZE(imx208_test_pattern_menu) - 1,
 952                                      0, 0, imx208_test_pattern_menu);
 953
 954         if (ctrl_hdlr->error) {
 955                 ret = ctrl_hdlr->error;
 956                 dev_err(&client->dev, "%s control init failed (%d)\n",
 957                         __func__, ret);
 958                 goto error;
 959         }
 960
 961         imx208->sd.ctrl_handler = ctrl_hdlr;
 962
 963         return 0;
 964
 965 error:
 966         v4l2_ctrl_handler_free(ctrl_hdlr);
 967         mutex_destroy(&imx208->imx208_mx);
 968
 969         return ret;
 970 }
 971
 972 static void imx208_free_controls(struct imx208 *imx208)
 973 {
 974         v4l2_ctrl_handler_free(imx208->sd.ctrl_handler);
 975 }
 976
 977 static int imx208_probe(struct i2c_client *client)
 978 {
 979         struct imx208 *imx208;
 980         int ret;
 981         bool full_power;
 982         u32 val = 0;
 983
 984         device_property_read_u32(&client->dev, "clock-frequency", &val);
 985         if (val != 19200000) {
 986                 dev_err(&client->dev,
 987                         "Unsupported clock-frequency %u. Expected 19200000.\n",
 988                         val);
 989                 return -EINVAL;
 990         }
 991
 992         imx208 = devm_kzalloc(&client->dev, sizeof(*imx208), GFP_KERNEL);
 993         if (!imx208)
 994                 return -ENOMEM;
 995
 996         /* Initialize subdev */
 997         v4l2_i2c_subdev_init(&imx208->sd, client, &imx208_subdev_ops);
 998
 999         full_power = acpi_dev_state_d0(&client->dev);
1000         if (full_power) {
1001                 /* Check module identity */
1002                 ret = imx208_identify_module(imx208);
1003                 if (ret) {
1004                         dev_err(&client->dev, "failed to find sensor: %d", ret);
1005                         goto error_probe;
1006                 }
1007         }
1008
1009         /* Set default mode to max resolution */
1010         imx208->cur_mode = &supported_modes[0];
1011
1012         ret = imx208_init_controls(imx208);
1013         if (ret) {
1014                 dev_err(&client->dev, "failed to init controls: %d", ret);
1015                 goto error_probe;
1016         }
1017
1018         /* Initialize subdev */
1019         imx208->sd.internal_ops = &imx208_internal_ops;
1020         imx208->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
1021         imx208->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
1022
1023         /* Initialize source pad */
1024         imx208->pad.flags = MEDIA_PAD_FL_SOURCE;
1025         ret = media_entity_pads_init(&imx208->sd.entity, 1, &imx208->pad);
1026         if (ret) {
1027                 dev_err(&client->dev, "%s failed:%d\n", __func__, ret);
1028                 goto error_handler_free;
1029         }
1030
1031         ret = v4l2_async_register_subdev_sensor(&imx208->sd);
1032         if (ret < 0)
1033                 goto error_media_entity;
1034
1035         ret = device_create_bin_file(&client->dev, &bin_attr_otp);
1036         if (ret) {
1037                 dev_err(&client->dev, "sysfs otp creation failed\n");
1038                 goto error_async_subdev;
1039         }
1040
1041         /* Set the device's state to active if it's in D0 state. */
1042         if (full_power)
1043                 pm_runtime_set_active(&client->dev);
1044         pm_runtime_enable(&client->dev);
1045         pm_runtime_idle(&client->dev);
1046
1047         return 0;
1048
1049 error_async_subdev:
1050         v4l2_async_unregister_subdev(&imx208->sd);
1051
1052 error_media_entity:
1053         media_entity_cleanup(&imx208->sd.entity);
1054
1055 error_handler_free:
1056         imx208_free_controls(imx208);
1057
1058 error_probe:
1059         mutex_destroy(&imx208->imx208_mx);
1060
1061         return ret;
1062 }
1063
1064 static void imx208_remove(struct i2c_client *client)
1065 {
1066         struct v4l2_subdev *sd = i2c_get_clientdata(client);
1067         struct imx208 *imx208 = to_imx208(sd);
1068
1069         device_remove_bin_file(&client->dev, &bin_attr_otp);
1070         v4l2_async_unregister_subdev(sd);
1071         media_entity_cleanup(&sd->entity);
1072         imx208_free_controls(imx208);
1073
1074         pm_runtime_disable(&client->dev);
1075         pm_runtime_set_suspended(&client->dev);
1076
1077         mutex_destroy(&imx208->imx208_mx);
1078 }
1079
1080 static const struct dev_pm_ops imx208_pm_ops = {
1081         SET_SYSTEM_SLEEP_PM_OPS(imx208_suspend, imx208_resume)
1082 };
1083
1084 #ifdef CONFIG_ACPI
1085 static const struct acpi_device_id imx208_acpi_ids[] = {
1086         { "INT3478" },
1087         { /* sentinel */ }
1088 };
1089
1090 MODULE_DEVICE_TABLE(acpi, imx208_acpi_ids);
1091 #endif
1092
1093 static struct i2c_driver imx208_i2c_driver = {
1094         .driver = {
1095                 .name = "imx208",
1096                 .pm = &imx208_pm_ops,
1097                 .acpi_match_table = ACPI_PTR(imx208_acpi_ids),
1098         },
1099         .probe_new = imx208_probe,
1100         .remove = imx208_remove,
1101         .flags = I2C_DRV_ACPI_WAIVE_D0_PROBE,
1102 };
1103
1104 module_i2c_driver(imx208_i2c_driver);
1105
1106 MODULE_AUTHOR("Yeh, Andy <andy.yeh@intel.com>");
1107 MODULE_AUTHOR("Chen, Ping-chung <ping-chung.chen@intel.com>");
1108 MODULE_AUTHOR("Shawn Tu <shawnx.tu@intel.com>");
1109 MODULE_DESCRIPTION("Sony IMX208 sensor driver");
1110 MODULE_LICENSE("GPL v2");