drivers/media/i2c/imx274.c

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This source file includes following definitions.
msleep_range
ctrl_to_sd
to_imx274
imx274_write_table
imx274_write_reg
imx274_read_mbreg
imx274_write_mbreg
imx274_mode_regs
imx274_start_stream
imx274_reset
imx274_s_ctrl
imx274_binning_goodness
__imx274_change_compose
imx274_get_fmt
imx274_set_fmt
imx274_get_selection
imx274_set_selection_crop
imx274_set_selection
imx274_apply_trimming
imx274_g_frame_interval
imx274_s_frame_interval
imx274_load_default
imx274_s_stream
imx274_get_frame_length
imx274_clamp_coarse_time
imx274_set_digital_gain
imx274_set_gain
imx274_set_coarse_time
imx274_set_exposure
imx274_set_vflip
imx274_set_test_pattern
imx274_set_frame_length
imx274_set_frame_interval
imx274_probe
imx274_remove
   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * imx274.c - IMX274 CMOS Image Sensor driver
   4  *
   5  * Copyright (C) 2017, Leopard Imaging, Inc.
   6  *
   7  * Leon Luo <leonl@leopardimaging.com>
   8  * Edwin Zou <edwinz@leopardimaging.com>
   9  * Luca Ceresoli <luca@lucaceresoli.net>
  10  */
  11 
  12 #include <linux/clk.h>
  13 #include <linux/delay.h>
  14 #include <linux/gpio.h>
  15 #include <linux/gpio/consumer.h>
  16 #include <linux/i2c.h>
  17 #include <linux/init.h>
  18 #include <linux/kernel.h>
  19 #include <linux/module.h>
  20 #include <linux/of_gpio.h>
  21 #include <linux/regmap.h>
  22 #include <linux/slab.h>
  23 #include <linux/v4l2-mediabus.h>
  24 #include <linux/videodev2.h>
  25 
  26 #include <media/v4l2-ctrls.h>
  27 #include <media/v4l2-device.h>
  28 #include <media/v4l2-subdev.h>
  29 
  30 /*
  31  * See "SHR, SVR Setting" in datasheet
  32  */
  33 #define IMX274_DEFAULT_FRAME_LENGTH             (4550)
  34 #define IMX274_MAX_FRAME_LENGTH                 (0x000fffff)
  35 
  36 /*
  37  * See "Frame Rate Adjustment" in datasheet
  38  */
  39 #define IMX274_PIXCLK_CONST1                    (72000000)
  40 #define IMX274_PIXCLK_CONST2                    (1000000)
  41 
  42 /*
  43  * The input gain is shifted by IMX274_GAIN_SHIFT to get
  44  * decimal number. The real gain is
  45  * (float)input_gain_value / (1 << IMX274_GAIN_SHIFT)
  46  */
  47 #define IMX274_GAIN_SHIFT                       (8)
  48 #define IMX274_GAIN_SHIFT_MASK                  ((1 << IMX274_GAIN_SHIFT) - 1)
  49 
  50 /*
  51  * See "Analog Gain" and "Digital Gain" in datasheet
  52  * min gain is 1X
  53  * max gain is calculated based on IMX274_GAIN_REG_MAX
  54  */
  55 #define IMX274_GAIN_REG_MAX                     (1957)
  56 #define IMX274_MIN_GAIN                         (0x01 << IMX274_GAIN_SHIFT)
  57 #define IMX274_MAX_ANALOG_GAIN                  ((2048 << IMX274_GAIN_SHIFT)\
  58                                         / (2048 - IMX274_GAIN_REG_MAX))
  59 #define IMX274_MAX_DIGITAL_GAIN                 (8)
  60 #define IMX274_DEF_GAIN                         (20 << IMX274_GAIN_SHIFT)
  61 #define IMX274_GAIN_CONST                       (2048) /* for gain formula */
  62 
  63 /*
  64  * 1 line time in us = (HMAX / 72), minimal is 4 lines
  65  */
  66 #define IMX274_MIN_EXPOSURE_TIME                (4 * 260 / 72)
  67 
  68 #define IMX274_DEFAULT_BINNING                  IMX274_BINNING_OFF
  69 #define IMX274_MAX_WIDTH                        (3840)
  70 #define IMX274_MAX_HEIGHT                       (2160)
  71 #define IMX274_MAX_FRAME_RATE                   (120)
  72 #define IMX274_MIN_FRAME_RATE                   (5)
  73 #define IMX274_DEF_FRAME_RATE                   (60)
  74 
  75 /*
  76  * register SHR is limited to (SVR value + 1) x VMAX value - 4
  77  */
  78 #define IMX274_SHR_LIMIT_CONST                  (4)
  79 
  80 /*
  81  * Min and max sensor reset delay (microseconds)
  82  */
  83 #define IMX274_RESET_DELAY1                     (2000)
  84 #define IMX274_RESET_DELAY2                     (2200)
  85 
  86 /*
  87  * shift and mask constants
  88  */
  89 #define IMX274_SHIFT_8_BITS                     (8)
  90 #define IMX274_SHIFT_16_BITS                    (16)
  91 #define IMX274_MASK_LSB_2_BITS                  (0x03)
  92 #define IMX274_MASK_LSB_3_BITS                  (0x07)
  93 #define IMX274_MASK_LSB_4_BITS                  (0x0f)
  94 #define IMX274_MASK_LSB_8_BITS                  (0x00ff)
  95 
  96 #define DRIVER_NAME "IMX274"
  97 
  98 /*
  99  * IMX274 register definitions
 100  */
 101 #define IMX274_SHR_REG_MSB                      0x300D /* SHR */
 102 #define IMX274_SHR_REG_LSB                      0x300C /* SHR */
 103 #define IMX274_SVR_REG_MSB                      0x300F /* SVR */
 104 #define IMX274_SVR_REG_LSB                      0x300E /* SVR */
 105 #define IMX274_HTRIM_EN_REG                     0x3037
 106 #define IMX274_HTRIM_START_REG_LSB              0x3038
 107 #define IMX274_HTRIM_START_REG_MSB              0x3039
 108 #define IMX274_HTRIM_END_REG_LSB                0x303A
 109 #define IMX274_HTRIM_END_REG_MSB                0x303B
 110 #define IMX274_VWIDCUTEN_REG                    0x30DD
 111 #define IMX274_VWIDCUT_REG_LSB                  0x30DE
 112 #define IMX274_VWIDCUT_REG_MSB                  0x30DF
 113 #define IMX274_VWINPOS_REG_LSB                  0x30E0
 114 #define IMX274_VWINPOS_REG_MSB                  0x30E1
 115 #define IMX274_WRITE_VSIZE_REG_LSB              0x3130
 116 #define IMX274_WRITE_VSIZE_REG_MSB              0x3131
 117 #define IMX274_Y_OUT_SIZE_REG_LSB               0x3132
 118 #define IMX274_Y_OUT_SIZE_REG_MSB               0x3133
 119 #define IMX274_VMAX_REG_1                       0x30FA /* VMAX, MSB */
 120 #define IMX274_VMAX_REG_2                       0x30F9 /* VMAX */
 121 #define IMX274_VMAX_REG_3                       0x30F8 /* VMAX, LSB */
 122 #define IMX274_HMAX_REG_MSB                     0x30F7 /* HMAX */
 123 #define IMX274_HMAX_REG_LSB                     0x30F6 /* HMAX */
 124 #define IMX274_ANALOG_GAIN_ADDR_LSB             0x300A /* ANALOG GAIN LSB */
 125 #define IMX274_ANALOG_GAIN_ADDR_MSB             0x300B /* ANALOG GAIN MSB */
 126 #define IMX274_DIGITAL_GAIN_REG                 0x3012 /* Digital Gain */
 127 #define IMX274_VFLIP_REG                        0x301A /* VERTICAL FLIP */
 128 #define IMX274_TEST_PATTERN_REG                 0x303D /* TEST PATTERN */
 129 #define IMX274_STANDBY_REG                      0x3000 /* STANDBY */
 130 
 131 #define IMX274_TABLE_WAIT_MS                    0
 132 #define IMX274_TABLE_END                        1
 133 
 134 /*
 135  * imx274 I2C operation related structure
 136  */
 137 struct reg_8 {
 138         u16 addr;
 139         u8 val;
 140 };
 141 
 142 static const struct regmap_config imx274_regmap_config = {
 143         .reg_bits = 16,
 144         .val_bits = 8,
 145         .cache_type = REGCACHE_RBTREE,
 146 };
 147 
 148 enum imx274_binning {
 149         IMX274_BINNING_OFF,
 150         IMX274_BINNING_2_1,
 151         IMX274_BINNING_3_1,
 152 };
 153 
 154 /*
 155  * Parameters for each imx274 readout mode.
 156  *
 157  * These are the values to configure the sensor in one of the
 158  * implemented modes.
 159  *
 160  * @init_regs: registers to initialize the mode
 161  * @bin_ratio: downscale factor (e.g. 3 for 3:1 binning)
 162  * @min_frame_len: Minimum frame length for each mode (see "Frame Rate
 163  *                 Adjustment (CSI-2)" in the datasheet)
 164  * @min_SHR: Minimum SHR register value (see "Shutter Setting (CSI-2)" in the
 165  *           datasheet)
 166  * @max_fps: Maximum frames per second
 167  * @nocpiop: Number of clocks per internal offset period (see "Integration Time
 168  *           in Each Readout Drive Mode (CSI-2)" in the datasheet)
 169  */
 170 struct imx274_mode {
 171         const struct reg_8 *init_regs;
 172         unsigned int bin_ratio;
 173         int min_frame_len;
 174         int min_SHR;
 175         int max_fps;
 176         int nocpiop;
 177 };
 178 
 179 /*
 180  * imx274 test pattern related structure
 181  */
 182 enum {
 183         TEST_PATTERN_DISABLED = 0,
 184         TEST_PATTERN_ALL_000H,
 185         TEST_PATTERN_ALL_FFFH,
 186         TEST_PATTERN_ALL_555H,
 187         TEST_PATTERN_ALL_AAAH,
 188         TEST_PATTERN_VSP_5AH, /* VERTICAL STRIPE PATTERN 555H/AAAH */
 189         TEST_PATTERN_VSP_A5H, /* VERTICAL STRIPE PATTERN AAAH/555H */
 190         TEST_PATTERN_VSP_05H, /* VERTICAL STRIPE PATTERN 000H/555H */
 191         TEST_PATTERN_VSP_50H, /* VERTICAL STRIPE PATTERN 555H/000H */
 192         TEST_PATTERN_VSP_0FH, /* VERTICAL STRIPE PATTERN 000H/FFFH */
 193         TEST_PATTERN_VSP_F0H, /* VERTICAL STRIPE PATTERN FFFH/000H */
 194         TEST_PATTERN_H_COLOR_BARS,
 195         TEST_PATTERN_V_COLOR_BARS,
 196 };
 197 
 198 static const char * const tp_qmenu[] = {
 199         "Disabled",
 200         "All 000h Pattern",
 201         "All FFFh Pattern",
 202         "All 555h Pattern",
 203         "All AAAh Pattern",
 204         "Vertical Stripe (555h / AAAh)",
 205         "Vertical Stripe (AAAh / 555h)",
 206         "Vertical Stripe (000h / 555h)",
 207         "Vertical Stripe (555h / 000h)",
 208         "Vertical Stripe (000h / FFFh)",
 209         "Vertical Stripe (FFFh / 000h)",
 210         "Vertical Color Bars",
 211         "Horizontal Color Bars",
 212 };
 213 
 214 /*
 215  * All-pixel scan mode (10-bit)
 216  * imx274 mode1(refer to datasheet) register configuration with
 217  * 3840x2160 resolution, raw10 data and mipi four lane output
 218  */
 219 static const struct reg_8 imx274_mode1_3840x2160_raw10[] = {
 220         {0x3004, 0x01},
 221         {0x3005, 0x01},
 222         {0x3006, 0x00},
 223         {0x3007, 0xa2},
 224 
 225         {0x3018, 0xA2}, /* output XVS, HVS */
 226 
 227         {0x306B, 0x05},
 228         {0x30E2, 0x01},
 229 
 230         {0x30EE, 0x01},
 231         {0x3342, 0x0A},
 232         {0x3343, 0x00},
 233         {0x3344, 0x16},
 234         {0x3345, 0x00},
 235         {0x33A6, 0x01},
 236         {0x3528, 0x0E},
 237         {0x3554, 0x1F},
 238         {0x3555, 0x01},
 239         {0x3556, 0x01},
 240         {0x3557, 0x01},
 241         {0x3558, 0x01},
 242         {0x3559, 0x00},
 243         {0x355A, 0x00},
 244         {0x35BA, 0x0E},
 245         {0x366A, 0x1B},
 246         {0x366B, 0x1A},
 247         {0x366C, 0x19},
 248         {0x366D, 0x17},
 249         {0x3A41, 0x08},
 250 
 251         {IMX274_TABLE_END, 0x00}
 252 };
 253 
 254 /*
 255  * Horizontal/vertical 2/2-line binning
 256  * (Horizontal and vertical weightedbinning, 10-bit)
 257  * imx274 mode3(refer to datasheet) register configuration with
 258  * 1920x1080 resolution, raw10 data and mipi four lane output
 259  */
 260 static const struct reg_8 imx274_mode3_1920x1080_raw10[] = {
 261         {0x3004, 0x02},
 262         {0x3005, 0x21},
 263         {0x3006, 0x00},
 264         {0x3007, 0xb1},
 265 
 266         {0x3018, 0xA2}, /* output XVS, HVS */
 267 
 268         {0x306B, 0x05},
 269         {0x30E2, 0x02},
 270 
 271         {0x30EE, 0x01},
 272         {0x3342, 0x0A},
 273         {0x3343, 0x00},
 274         {0x3344, 0x1A},
 275         {0x3345, 0x00},
 276         {0x33A6, 0x01},
 277         {0x3528, 0x0E},
 278         {0x3554, 0x00},
 279         {0x3555, 0x01},
 280         {0x3556, 0x01},
 281         {0x3557, 0x01},
 282         {0x3558, 0x01},
 283         {0x3559, 0x00},
 284         {0x355A, 0x00},
 285         {0x35BA, 0x0E},
 286         {0x366A, 0x1B},
 287         {0x366B, 0x1A},
 288         {0x366C, 0x19},
 289         {0x366D, 0x17},
 290         {0x3A41, 0x08},
 291 
 292         {IMX274_TABLE_END, 0x00}
 293 };
 294 
 295 /*
 296  * Vertical 2/3 subsampling binning horizontal 3 binning
 297  * imx274 mode5(refer to datasheet) register configuration with
 298  * 1280x720 resolution, raw10 data and mipi four lane output
 299  */
 300 static const struct reg_8 imx274_mode5_1280x720_raw10[] = {
 301         {0x3004, 0x03},
 302         {0x3005, 0x31},
 303         {0x3006, 0x00},
 304         {0x3007, 0xa9},
 305 
 306         {0x3018, 0xA2}, /* output XVS, HVS */
 307 
 308         {0x306B, 0x05},
 309         {0x30E2, 0x03},
 310 
 311         {0x30EE, 0x01},
 312         {0x3342, 0x0A},
 313         {0x3343, 0x00},
 314         {0x3344, 0x1B},
 315         {0x3345, 0x00},
 316         {0x33A6, 0x01},
 317         {0x3528, 0x0E},
 318         {0x3554, 0x00},
 319         {0x3555, 0x01},
 320         {0x3556, 0x01},
 321         {0x3557, 0x01},
 322         {0x3558, 0x01},
 323         {0x3559, 0x00},
 324         {0x355A, 0x00},
 325         {0x35BA, 0x0E},
 326         {0x366A, 0x1B},
 327         {0x366B, 0x19},
 328         {0x366C, 0x17},
 329         {0x366D, 0x17},
 330         {0x3A41, 0x04},
 331 
 332         {IMX274_TABLE_END, 0x00}
 333 };
 334 
 335 /*
 336  * imx274 first step register configuration for
 337  * starting stream
 338  */
 339 static const struct reg_8 imx274_start_1[] = {
 340         {IMX274_STANDBY_REG, 0x12},
 341 
 342         /* PLRD: clock settings */
 343         {0x3120, 0xF0},
 344         {0x3121, 0x00},
 345         {0x3122, 0x02},
 346         {0x3129, 0x9C},
 347         {0x312A, 0x02},
 348         {0x312D, 0x02},
 349 
 350         {0x310B, 0x00},
 351 
 352         /* PLSTMG */
 353         {0x304C, 0x00}, /* PLSTMG01 */
 354         {0x304D, 0x03},
 355         {0x331C, 0x1A},
 356         {0x331D, 0x00},
 357         {0x3502, 0x02},
 358         {0x3529, 0x0E},
 359         {0x352A, 0x0E},
 360         {0x352B, 0x0E},
 361         {0x3538, 0x0E},
 362         {0x3539, 0x0E},
 363         {0x3553, 0x00},
 364         {0x357D, 0x05},
 365         {0x357F, 0x05},
 366         {0x3581, 0x04},
 367         {0x3583, 0x76},
 368         {0x3587, 0x01},
 369         {0x35BB, 0x0E},
 370         {0x35BC, 0x0E},
 371         {0x35BD, 0x0E},
 372         {0x35BE, 0x0E},
 373         {0x35BF, 0x0E},
 374         {0x366E, 0x00},
 375         {0x366F, 0x00},
 376         {0x3670, 0x00},
 377         {0x3671, 0x00},
 378 
 379         /* PSMIPI */
 380         {0x3304, 0x32}, /* PSMIPI1 */
 381         {0x3305, 0x00},
 382         {0x3306, 0x32},
 383         {0x3307, 0x00},
 384         {0x3590, 0x32},
 385         {0x3591, 0x00},
 386         {0x3686, 0x32},
 387         {0x3687, 0x00},
 388 
 389         {IMX274_TABLE_END, 0x00}
 390 };
 391 
 392 /*
 393  * imx274 second step register configuration for
 394  * starting stream
 395  */
 396 static const struct reg_8 imx274_start_2[] = {
 397         {IMX274_STANDBY_REG, 0x00},
 398         {0x303E, 0x02}, /* SYS_MODE = 2 */
 399         {IMX274_TABLE_END, 0x00}
 400 };
 401 
 402 /*
 403  * imx274 third step register configuration for
 404  * starting stream
 405  */
 406 static const struct reg_8 imx274_start_3[] = {
 407         {0x30F4, 0x00},
 408         {0x3018, 0xA2}, /* XHS VHS OUTPUT */
 409         {IMX274_TABLE_END, 0x00}
 410 };
 411 
 412 /*
 413  * imx274 register configuration for stopping stream
 414  */
 415 static const struct reg_8 imx274_stop[] = {
 416         {IMX274_STANDBY_REG, 0x01},
 417         {IMX274_TABLE_END, 0x00}
 418 };
 419 
 420 /*
 421  * imx274 disable test pattern register configuration
 422  */
 423 static const struct reg_8 imx274_tp_disabled[] = {
 424         {0x303C, 0x00},
 425         {0x377F, 0x00},
 426         {0x3781, 0x00},
 427         {0x370B, 0x00},
 428         {IMX274_TABLE_END, 0x00}
 429 };
 430 
 431 /*
 432  * imx274 test pattern register configuration
 433  * reg 0x303D defines the test pattern modes
 434  */
 435 static const struct reg_8 imx274_tp_regs[] = {
 436         {0x303C, 0x11},
 437         {0x370E, 0x01},
 438         {0x377F, 0x01},
 439         {0x3781, 0x01},
 440         {0x370B, 0x11},
 441         {IMX274_TABLE_END, 0x00}
 442 };
 443 
 444 /* nocpiop happens to be the same number for the implemented modes */
 445 static const struct imx274_mode imx274_modes[] = {
 446         {
 447                 /* mode 1, 4K */
 448                 .bin_ratio = 1,
 449                 .init_regs = imx274_mode1_3840x2160_raw10,
 450                 .min_frame_len = 4550,
 451                 .min_SHR = 12,
 452                 .max_fps = 60,
 453                 .nocpiop = 112,
 454         },
 455         {
 456                 /* mode 3, 1080p */
 457                 .bin_ratio = 2,
 458                 .init_regs = imx274_mode3_1920x1080_raw10,
 459                 .min_frame_len = 2310,
 460                 .min_SHR = 8,
 461                 .max_fps = 120,
 462                 .nocpiop = 112,
 463         },
 464         {
 465                 /* mode 5, 720p */
 466                 .bin_ratio = 3,
 467                 .init_regs = imx274_mode5_1280x720_raw10,
 468                 .min_frame_len = 2310,
 469                 .min_SHR = 8,
 470                 .max_fps = 120,
 471                 .nocpiop = 112,
 472         },
 473 };
 474 
 475 /*
 476  * struct imx274_ctrls - imx274 ctrl structure
 477  * @handler: V4L2 ctrl handler structure
 478  * @exposure: Pointer to expsure ctrl structure
 479  * @gain: Pointer to gain ctrl structure
 480  * @vflip: Pointer to vflip ctrl structure
 481  * @test_pattern: Pointer to test pattern ctrl structure
 482  */
 483 struct imx274_ctrls {
 484         struct v4l2_ctrl_handler handler;
 485         struct v4l2_ctrl *exposure;
 486         struct v4l2_ctrl *gain;
 487         struct v4l2_ctrl *vflip;
 488         struct v4l2_ctrl *test_pattern;
 489 };
 490 
 491 /*
 492  * struct stim274 - imx274 device structure
 493  * @sd: V4L2 subdevice structure
 494  * @pad: Media pad structure
 495  * @client: Pointer to I2C client
 496  * @ctrls: imx274 control structure
 497  * @crop: rect to be captured
 498  * @compose: compose rect, i.e. output resolution
 499  * @format: V4L2 media bus frame format structure
 500  *          (width and height are in sync with the compose rect)
 501  * @frame_rate: V4L2 frame rate structure
 502  * @regmap: Pointer to regmap structure
 503  * @reset_gpio: Pointer to reset gpio
 504  * @lock: Mutex structure
 505  * @mode: Parameters for the selected readout mode
 506  */
 507 struct stimx274 {
 508         struct v4l2_subdev sd;
 509         struct media_pad pad;
 510         struct i2c_client *client;
 511         struct imx274_ctrls ctrls;
 512         struct v4l2_rect crop;
 513         struct v4l2_mbus_framefmt format;
 514         struct v4l2_fract frame_interval;
 515         struct regmap *regmap;
 516         struct gpio_desc *reset_gpio;
 517         struct mutex lock; /* mutex lock for operations */
 518         const struct imx274_mode *mode;
 519 };
 520 
 521 #define IMX274_ROUND(dim, step, flags)                  \
 522         ((flags) & V4L2_SEL_FLAG_GE                     \
 523          ? roundup((dim), (step))                       \
 524          : ((flags) & V4L2_SEL_FLAG_LE                  \
 525             ? rounddown((dim), (step))                  \
 526             : rounddown((dim) + (step) / 2, (step))))
 527 
 528 /*
 529  * Function declaration
 530  */
 531 static int imx274_set_gain(struct stimx274 *priv, struct v4l2_ctrl *ctrl);
 532 static int imx274_set_exposure(struct stimx274 *priv, int val);
 533 static int imx274_set_vflip(struct stimx274 *priv, int val);
 534 static int imx274_set_test_pattern(struct stimx274 *priv, int val);
 535 static int imx274_set_frame_interval(struct stimx274 *priv,
 536                                      struct v4l2_fract frame_interval);
 537 
 538 static inline void msleep_range(unsigned int delay_base)
 539 {
 540         usleep_range(delay_base * 1000, delay_base * 1000 + 500);
 541 }
 542 
 543 /*
 544  * v4l2_ctrl and v4l2_subdev related operations
 545  */
 546 static inline struct v4l2_subdev *ctrl_to_sd(struct v4l2_ctrl *ctrl)
 547 {
 548         return &container_of(ctrl->handler,
 549                              struct stimx274, ctrls.handler)->sd;
 550 }
 551 
 552 static inline struct stimx274 *to_imx274(struct v4l2_subdev *sd)
 553 {
 554         return container_of(sd, struct stimx274, sd);
 555 }
 556 
 557 /*
 558  * Writing a register table
 559  *
 560  * @priv: Pointer to device
 561  * @table: Table containing register values (with optional delays)
 562  *
 563  * This is used to write register table into sensor's reg map.
 564  *
 565  * Return: 0 on success, errors otherwise
 566  */
 567 static int imx274_write_table(struct stimx274 *priv, const struct reg_8 table[])
 568 {
 569         struct regmap *regmap = priv->regmap;
 570         int err = 0;
 571         const struct reg_8 *next;
 572         u8 val;
 573 
 574         int range_start = -1;
 575         int range_count = 0;
 576         u8 range_vals[16];
 577         int max_range_vals = ARRAY_SIZE(range_vals);
 578 
 579         for (next = table;; next++) {
 580                 if ((next->addr != range_start + range_count) ||
 581                     (next->addr == IMX274_TABLE_END) ||
 582                     (next->addr == IMX274_TABLE_WAIT_MS) ||
 583                     (range_count == max_range_vals)) {
 584                         if (range_count == 1)
 585                                 err = regmap_write(regmap,
 586                                                    range_start, range_vals[0]);
 587                         else if (range_count > 1)
 588                                 err = regmap_bulk_write(regmap, range_start,
 589                                                         &range_vals[0],
 590                                                         range_count);
 591                         else
 592                                 err = 0;
 593 
 594                         if (err)
 595                                 return err;
 596 
 597                         range_start = -1;
 598                         range_count = 0;
 599 
 600                         /* Handle special address values */
 601                         if (next->addr == IMX274_TABLE_END)
 602                                 break;
 603 
 604                         if (next->addr == IMX274_TABLE_WAIT_MS) {
 605                                 msleep_range(next->val);
 606                                 continue;
 607                         }
 608                 }
 609 
 610                 val = next->val;
 611 
 612                 if (range_start == -1)
 613                         range_start = next->addr;
 614 
 615                 range_vals[range_count++] = val;
 616         }
 617         return 0;
 618 }
 619 
 620 static inline int imx274_write_reg(struct stimx274 *priv, u16 addr, u8 val)
 621 {
 622         int err;
 623 
 624         err = regmap_write(priv->regmap, addr, val);
 625         if (err)
 626                 dev_err(&priv->client->dev,
 627                         "%s : i2c write failed, %x = %x\n", __func__,
 628                         addr, val);
 629         else
 630                 dev_dbg(&priv->client->dev,
 631                         "%s : addr 0x%x, val=0x%x\n", __func__,
 632                         addr, val);
 633         return err;
 634 }
 635 
 636 /**
 637  * Read a multibyte register.
 638  *
 639  * Uses a bulk read where possible.
 640  *
 641  * @priv: Pointer to device structure
 642  * @addr: Address of the LSB register.  Other registers must be
 643  *        consecutive, least-to-most significant.
 644  * @val: Pointer to store the register value (cpu endianness)
 645  * @nbytes: Number of bytes to read (range: [1..3]).
 646  *          Other bytes are zet to 0.
 647  *
 648  * Return: 0 on success, errors otherwise
 649  */
 650 static int imx274_read_mbreg(struct stimx274 *priv, u16 addr, u32 *val,
 651                              size_t nbytes)
 652 {
 653         __le32 val_le = 0;
 654         int err;
 655 
 656         err = regmap_bulk_read(priv->regmap, addr, &val_le, nbytes);
 657         if (err) {
 658                 dev_err(&priv->client->dev,
 659                         "%s : i2c bulk read failed, %x (%zu bytes)\n",
 660                         __func__, addr, nbytes);
 661         } else {
 662                 *val = le32_to_cpu(val_le);
 663                 dev_dbg(&priv->client->dev,
 664                         "%s : addr 0x%x, val=0x%x (%zu bytes)\n",
 665                         __func__, addr, *val, nbytes);
 666         }
 667 
 668         return err;
 669 }
 670 
 671 /**
 672  * Write a multibyte register.
 673  *
 674  * Uses a bulk write where possible.
 675  *
 676  * @priv: Pointer to device structure
 677  * @addr: Address of the LSB register.  Other registers must be
 678  *        consecutive, least-to-most significant.
 679  * @val: Value to be written to the register (cpu endianness)
 680  * @nbytes: Number of bytes to write (range: [1..3])
 681  */
 682 static int imx274_write_mbreg(struct stimx274 *priv, u16 addr, u32 val,
 683                               size_t nbytes)
 684 {
 685         __le32 val_le = cpu_to_le32(val);
 686         int err;
 687 
 688         err = regmap_bulk_write(priv->regmap, addr, &val_le, nbytes);
 689         if (err)
 690                 dev_err(&priv->client->dev,
 691                         "%s : i2c bulk write failed, %x = %x (%zu bytes)\n",
 692                         __func__, addr, val, nbytes);
 693         else
 694                 dev_dbg(&priv->client->dev,
 695                         "%s : addr 0x%x, val=0x%x (%zu bytes)\n",
 696                         __func__, addr, val, nbytes);
 697         return err;
 698 }
 699 
 700 /*
 701  * Set mode registers to start stream.
 702  * @priv: Pointer to device structure
 703  *
 704  * Return: 0 on success, errors otherwise
 705  */
 706 static int imx274_mode_regs(struct stimx274 *priv)
 707 {
 708         int err = 0;
 709 
 710         err = imx274_write_table(priv, imx274_start_1);
 711         if (err)
 712                 return err;
 713 
 714         err = imx274_write_table(priv, priv->mode->init_regs);
 715 
 716         return err;
 717 }
 718 
 719 /*
 720  * imx274_start_stream - Function for starting stream per mode index
 721  * @priv: Pointer to device structure
 722  *
 723  * Return: 0 on success, errors otherwise
 724  */
 725 static int imx274_start_stream(struct stimx274 *priv)
 726 {
 727         int err = 0;
 728 
 729         /*
 730          * Refer to "Standby Cancel Sequence when using CSI-2" in
 731          * imx274 datasheet, it should wait 10ms or more here.
 732          * give it 1 extra ms for margin
 733          */
 734         msleep_range(11);
 735         err = imx274_write_table(priv, imx274_start_2);
 736         if (err)
 737                 return err;
 738 
 739         /*
 740          * Refer to "Standby Cancel Sequence when using CSI-2" in
 741          * imx274 datasheet, it should wait 7ms or more here.
 742          * give it 1 extra ms for margin
 743          */
 744         msleep_range(8);
 745         err = imx274_write_table(priv, imx274_start_3);
 746         if (err)
 747                 return err;
 748 
 749         return 0;
 750 }
 751 
 752 /*
 753  * imx274_reset - Function called to reset the sensor
 754  * @priv: Pointer to device structure
 755  * @rst: Input value for determining the sensor's end state after reset
 756  *
 757  * Set the senor in reset and then
 758  * if rst = 0, keep it in reset;
 759  * if rst = 1, bring it out of reset.
 760  *
 761  */
 762 static void imx274_reset(struct stimx274 *priv, int rst)
 763 {
 764         gpiod_set_value_cansleep(priv->reset_gpio, 0);
 765         usleep_range(IMX274_RESET_DELAY1, IMX274_RESET_DELAY2);
 766         gpiod_set_value_cansleep(priv->reset_gpio, !!rst);
 767         usleep_range(IMX274_RESET_DELAY1, IMX274_RESET_DELAY2);
 768 }
 769 
 770 /**
 771  * imx274_s_ctrl - This is used to set the imx274 V4L2 controls
 772  * @ctrl: V4L2 control to be set
 773  *
 774  * This function is used to set the V4L2 controls for the imx274 sensor.
 775  *
 776  * Return: 0 on success, errors otherwise
 777  */
 778 static int imx274_s_ctrl(struct v4l2_ctrl *ctrl)
 779 {
 780         struct v4l2_subdev *sd = ctrl_to_sd(ctrl);
 781         struct stimx274 *imx274 = to_imx274(sd);
 782         int ret = -EINVAL;
 783 
 784         dev_dbg(&imx274->client->dev,
 785                 "%s : s_ctrl: %s, value: %d\n", __func__,
 786                 ctrl->name, ctrl->val);
 787 
 788         switch (ctrl->id) {
 789         case V4L2_CID_EXPOSURE:
 790                 dev_dbg(&imx274->client->dev,
 791                         "%s : set V4L2_CID_EXPOSURE\n", __func__);
 792                 ret = imx274_set_exposure(imx274, ctrl->val);
 793                 break;
 794 
 795         case V4L2_CID_GAIN:
 796                 dev_dbg(&imx274->client->dev,
 797                         "%s : set V4L2_CID_GAIN\n", __func__);
 798                 ret = imx274_set_gain(imx274, ctrl);
 799                 break;
 800 
 801         case V4L2_CID_VFLIP:
 802                 dev_dbg(&imx274->client->dev,
 803                         "%s : set V4L2_CID_VFLIP\n", __func__);
 804                 ret = imx274_set_vflip(imx274, ctrl->val);
 805                 break;
 806 
 807         case V4L2_CID_TEST_PATTERN:
 808                 dev_dbg(&imx274->client->dev,
 809                         "%s : set V4L2_CID_TEST_PATTERN\n", __func__);
 810                 ret = imx274_set_test_pattern(imx274, ctrl->val);
 811                 break;
 812         }
 813 
 814         return ret;
 815 }
 816 
 817 static int imx274_binning_goodness(struct stimx274 *imx274,
 818                                    int w, int ask_w,
 819                                    int h, int ask_h, u32 flags)
 820 {
 821         struct device *dev = &imx274->client->dev;
 822         const int goodness = 100000;
 823         int val = 0;
 824 
 825         if (flags & V4L2_SEL_FLAG_GE) {
 826                 if (w < ask_w)
 827                         val -= goodness;
 828                 if (h < ask_h)
 829                         val -= goodness;
 830         }
 831 
 832         if (flags & V4L2_SEL_FLAG_LE) {
 833                 if (w > ask_w)
 834                         val -= goodness;
 835                 if (h > ask_h)
 836                         val -= goodness;
 837         }
 838 
 839         val -= abs(w - ask_w);
 840         val -= abs(h - ask_h);
 841 
 842         dev_dbg(dev, "%s: ask %dx%d, size %dx%d, goodness %d\n",
 843                 __func__, ask_w, ask_h, w, h, val);
 844 
 845         return val;
 846 }
 847 
 848 /**
 849  * Helper function to change binning and set both compose and format.
 850  *
 851  * We have two entry points to change binning: set_fmt and
 852  * set_selection(COMPOSE). Both have to compute the new output size
 853  * and set it in both the compose rect and the frame format size. We
 854  * also need to do the same things after setting cropping to restore
 855  * 1:1 binning.
 856  *
 857  * This function contains the common code for these three cases, it
 858  * has many arguments in order to accommodate the needs of all of
 859  * them.
 860  *
 861  * Must be called with imx274->lock locked.
 862  *
 863  * @imx274: The device object
 864  * @cfg:    The pad config we are editing for TRY requests
 865  * @which:  V4L2_SUBDEV_FORMAT_ACTIVE or V4L2_SUBDEV_FORMAT_TRY from the caller
 866  * @width:  Input-output parameter: set to the desired width before
 867  *          the call, contains the chosen value after returning successfully
 868  * @height: Input-output parameter for height (see @width)
 869  * @flags:  Selection flags from struct v4l2_subdev_selection, or 0 if not
 870  *          available (when called from set_fmt)
 871  */
 872 static int __imx274_change_compose(struct stimx274 *imx274,
 873                                    struct v4l2_subdev_pad_config *cfg,
 874                                    u32 which,
 875                                    u32 *width,
 876                                    u32 *height,
 877                                    u32 flags)
 878 {
 879         struct device *dev = &imx274->client->dev;
 880         const struct v4l2_rect *cur_crop;
 881         struct v4l2_mbus_framefmt *tgt_fmt;
 882         unsigned int i;
 883         const struct imx274_mode *best_mode = &imx274_modes[0];
 884         int best_goodness = INT_MIN;
 885 
 886         if (which == V4L2_SUBDEV_FORMAT_TRY) {
 887                 cur_crop = &cfg->try_crop;
 888                 tgt_fmt = &cfg->try_fmt;
 889         } else {
 890                 cur_crop = &imx274->crop;
 891                 tgt_fmt = &imx274->format;
 892         }
 893 
 894         for (i = 0; i < ARRAY_SIZE(imx274_modes); i++) {
 895                 unsigned int ratio = imx274_modes[i].bin_ratio;
 896 
 897                 int goodness = imx274_binning_goodness(
 898                         imx274,
 899                         cur_crop->width / ratio, *width,
 900                         cur_crop->height / ratio, *height,
 901                         flags);
 902 
 903                 if (goodness >= best_goodness) {
 904                         best_goodness = goodness;
 905                         best_mode = &imx274_modes[i];
 906                 }
 907         }
 908 
 909         *width = cur_crop->width / best_mode->bin_ratio;
 910         *height = cur_crop->height / best_mode->bin_ratio;
 911 
 912         if (which == V4L2_SUBDEV_FORMAT_ACTIVE)
 913                 imx274->mode = best_mode;
 914 
 915         dev_dbg(dev, "%s: selected %u:1 binning\n",
 916                 __func__, best_mode->bin_ratio);
 917 
 918         tgt_fmt->width = *width;
 919         tgt_fmt->height = *height;
 920         tgt_fmt->field = V4L2_FIELD_NONE;
 921 
 922         return 0;
 923 }
 924 
 925 /**
 926  * imx274_get_fmt - Get the pad format
 927  * @sd: Pointer to V4L2 Sub device structure
 928  * @cfg: Pointer to sub device pad information structure
 929  * @fmt: Pointer to pad level media bus format
 930  *
 931  * This function is used to get the pad format information.
 932  *
 933  * Return: 0 on success
 934  */
 935 static int imx274_get_fmt(struct v4l2_subdev *sd,
 936                           struct v4l2_subdev_pad_config *cfg,
 937                           struct v4l2_subdev_format *fmt)
 938 {
 939         struct stimx274 *imx274 = to_imx274(sd);
 940 
 941         mutex_lock(&imx274->lock);
 942         fmt->format = imx274->format;
 943         mutex_unlock(&imx274->lock);
 944         return 0;
 945 }
 946 
 947 /**
 948  * imx274_set_fmt - This is used to set the pad format
 949  * @sd: Pointer to V4L2 Sub device structure
 950  * @cfg: Pointer to sub device pad information structure
 951  * @format: Pointer to pad level media bus format
 952  *
 953  * This function is used to set the pad format.
 954  *
 955  * Return: 0 on success
 956  */
 957 static int imx274_set_fmt(struct v4l2_subdev *sd,
 958                           struct v4l2_subdev_pad_config *cfg,
 959                           struct v4l2_subdev_format *format)
 960 {
 961         struct v4l2_mbus_framefmt *fmt = &format->format;
 962         struct stimx274 *imx274 = to_imx274(sd);
 963         int err = 0;
 964 
 965         mutex_lock(&imx274->lock);
 966 
 967         err = __imx274_change_compose(imx274, cfg, format->which,
 968                                       &fmt->width, &fmt->height, 0);
 969 
 970         if (err)
 971                 goto out;
 972 
 973         /*
 974          * __imx274_change_compose already set width and height in the
 975          * applicable format, but we need to keep all other format
 976          * values, so do a full copy here
 977          */
 978         fmt->field = V4L2_FIELD_NONE;
 979         if (format->which == V4L2_SUBDEV_FORMAT_TRY)
 980                 cfg->try_fmt = *fmt;
 981         else
 982                 imx274->format = *fmt;
 983 
 984 out:
 985         mutex_unlock(&imx274->lock);
 986 
 987         return err;
 988 }
 989 
 990 static int imx274_get_selection(struct v4l2_subdev *sd,
 991                                 struct v4l2_subdev_pad_config *cfg,
 992                                 struct v4l2_subdev_selection *sel)
 993 {
 994         struct stimx274 *imx274 = to_imx274(sd);
 995         const struct v4l2_rect *src_crop;
 996         const struct v4l2_mbus_framefmt *src_fmt;
 997         int ret = 0;
 998 
 999         if (sel->pad != 0)
1000                 return -EINVAL;
1001 
1002         if (sel->target == V4L2_SEL_TGT_CROP_BOUNDS) {
1003                 sel->r.left = 0;
1004                 sel->r.top = 0;
1005                 sel->r.width = IMX274_MAX_WIDTH;
1006                 sel->r.height = IMX274_MAX_HEIGHT;
1007                 return 0;
1008         }
1009 
1010         if (sel->which == V4L2_SUBDEV_FORMAT_TRY) {
1011                 src_crop = &cfg->try_crop;
1012                 src_fmt = &cfg->try_fmt;
1013         } else {
1014                 src_crop = &imx274->crop;
1015                 src_fmt = &imx274->format;
1016         }
1017 
1018         mutex_lock(&imx274->lock);
1019 
1020         switch (sel->target) {
1021         case V4L2_SEL_TGT_CROP:
1022                 sel->r = *src_crop;
1023                 break;
1024         case V4L2_SEL_TGT_COMPOSE_BOUNDS:
1025                 sel->r.top = 0;
1026                 sel->r.left = 0;
1027                 sel->r.width = src_crop->width;
1028                 sel->r.height = src_crop->height;
1029                 break;
1030         case V4L2_SEL_TGT_COMPOSE:
1031                 sel->r.top = 0;
1032                 sel->r.left = 0;
1033                 sel->r.width = src_fmt->width;
1034                 sel->r.height = src_fmt->height;
1035                 break;
1036         default:
1037                 ret = -EINVAL;
1038         }
1039 
1040         mutex_unlock(&imx274->lock);
1041 
1042         return ret;
1043 }
1044 
1045 static int imx274_set_selection_crop(struct stimx274 *imx274,
1046                                      struct v4l2_subdev_pad_config *cfg,
1047                                      struct v4l2_subdev_selection *sel)
1048 {
1049         struct v4l2_rect *tgt_crop;
1050         struct v4l2_rect new_crop;
1051         bool size_changed;
1052 
1053         /*
1054          * h_step could be 12 or 24 depending on the binning. But we
1055          * won't know the binning until we choose the mode later in
1056          * __imx274_change_compose(). Thus let's be safe and use the
1057          * most conservative value in all cases.
1058          */
1059         const u32 h_step = 24;
1060 
1061         new_crop.width = min_t(u32,
1062                                IMX274_ROUND(sel->r.width, h_step, sel->flags),
1063                                IMX274_MAX_WIDTH);
1064 
1065         /* Constraint: HTRIMMING_END - HTRIMMING_START >= 144 */
1066         if (new_crop.width < 144)
1067                 new_crop.width = 144;
1068 
1069         new_crop.left = min_t(u32,
1070                               IMX274_ROUND(sel->r.left, h_step, 0),
1071                               IMX274_MAX_WIDTH - new_crop.width);
1072 
1073         new_crop.height = min_t(u32,
1074                                 IMX274_ROUND(sel->r.height, 2, sel->flags),
1075                                 IMX274_MAX_HEIGHT);
1076 
1077         new_crop.top = min_t(u32, IMX274_ROUND(sel->r.top, 2, 0),
1078                              IMX274_MAX_HEIGHT - new_crop.height);
1079 
1080         sel->r = new_crop;
1081 
1082         if (sel->which == V4L2_SUBDEV_FORMAT_TRY)
1083                 tgt_crop = &cfg->try_crop;
1084         else
1085                 tgt_crop = &imx274->crop;
1086 
1087         mutex_lock(&imx274->lock);
1088 
1089         size_changed = (new_crop.width != tgt_crop->width ||
1090                         new_crop.height != tgt_crop->height);
1091 
1092         /* __imx274_change_compose needs the new size in *tgt_crop */
1093         *tgt_crop = new_crop;
1094 
1095         /* if crop size changed then reset the output image size */
1096         if (size_changed)
1097                 __imx274_change_compose(imx274, cfg, sel->which,
1098                                         &new_crop.width, &new_crop.height,
1099                                         sel->flags);
1100 
1101         mutex_unlock(&imx274->lock);
1102 
1103         return 0;
1104 }
1105 
1106 static int imx274_set_selection(struct v4l2_subdev *sd,
1107                                 struct v4l2_subdev_pad_config *cfg,
1108                                 struct v4l2_subdev_selection *sel)
1109 {
1110         struct stimx274 *imx274 = to_imx274(sd);
1111 
1112         if (sel->pad != 0)
1113                 return -EINVAL;
1114 
1115         if (sel->target == V4L2_SEL_TGT_CROP)
1116                 return imx274_set_selection_crop(imx274, cfg, sel);
1117 
1118         if (sel->target == V4L2_SEL_TGT_COMPOSE) {
1119                 int err;
1120 
1121                 mutex_lock(&imx274->lock);
1122                 err =  __imx274_change_compose(imx274, cfg, sel->which,
1123                                                &sel->r.width, &sel->r.height,
1124                                                sel->flags);
1125                 mutex_unlock(&imx274->lock);
1126 
1127                 /*
1128                  * __imx274_change_compose already set width and
1129                  * height in set->r, we still need to set top-left
1130                  */
1131                 if (!err) {
1132                         sel->r.top = 0;
1133                         sel->r.left = 0;
1134                 }
1135 
1136                 return err;
1137         }
1138 
1139         return -EINVAL;
1140 }
1141 
1142 static int imx274_apply_trimming(struct stimx274 *imx274)
1143 {
1144         u32 h_start;
1145         u32 h_end;
1146         u32 hmax;
1147         u32 v_cut;
1148         s32 v_pos;
1149         u32 write_v_size;
1150         u32 y_out_size;
1151         int err;
1152 
1153         h_start = imx274->crop.left + 12;
1154         h_end = h_start + imx274->crop.width;
1155 
1156         /* Use the minimum allowed value of HMAX */
1157         /* Note: except in mode 1, (width / 16 + 23) is always < hmax_min */
1158         /* Note: 260 is the minimum HMAX in all implemented modes */
1159         hmax = max_t(u32, 260, (imx274->crop.width) / 16 + 23);
1160 
1161         /* invert v_pos if VFLIP */
1162         v_pos = imx274->ctrls.vflip->cur.val ?
1163                 (-imx274->crop.top / 2) : (imx274->crop.top / 2);
1164         v_cut = (IMX274_MAX_HEIGHT - imx274->crop.height) / 2;
1165         write_v_size = imx274->crop.height + 22;
1166         y_out_size   = imx274->crop.height + 14;
1167 
1168         err = imx274_write_mbreg(imx274, IMX274_HMAX_REG_LSB, hmax, 2);
1169         if (!err)
1170                 err = imx274_write_mbreg(imx274, IMX274_HTRIM_EN_REG, 1, 1);
1171         if (!err)
1172                 err = imx274_write_mbreg(imx274, IMX274_HTRIM_START_REG_LSB,
1173                                          h_start, 2);
1174         if (!err)
1175                 err = imx274_write_mbreg(imx274, IMX274_HTRIM_END_REG_LSB,
1176                                          h_end, 2);
1177         if (!err)
1178                 err = imx274_write_mbreg(imx274, IMX274_VWIDCUTEN_REG, 1, 1);
1179         if (!err)
1180                 err = imx274_write_mbreg(imx274, IMX274_VWIDCUT_REG_LSB,
1181                                          v_cut, 2);
1182         if (!err)
1183                 err = imx274_write_mbreg(imx274, IMX274_VWINPOS_REG_LSB,
1184                                          v_pos, 2);
1185         if (!err)
1186                 err = imx274_write_mbreg(imx274, IMX274_WRITE_VSIZE_REG_LSB,
1187                                          write_v_size, 2);
1188         if (!err)
1189                 err = imx274_write_mbreg(imx274, IMX274_Y_OUT_SIZE_REG_LSB,
1190                                          y_out_size, 2);
1191 
1192         return err;
1193 }
1194 
1195 /**
1196  * imx274_g_frame_interval - Get the frame interval
1197  * @sd: Pointer to V4L2 Sub device structure
1198  * @fi: Pointer to V4l2 Sub device frame interval structure
1199  *
1200  * This function is used to get the frame interval.
1201  *
1202  * Return: 0 on success
1203  */
1204 static int imx274_g_frame_interval(struct v4l2_subdev *sd,
1205                                    struct v4l2_subdev_frame_interval *fi)
1206 {
1207         struct stimx274 *imx274 = to_imx274(sd);
1208 
1209         fi->interval = imx274->frame_interval;
1210         dev_dbg(&imx274->client->dev, "%s frame rate = %d / %d\n",
1211                 __func__, imx274->frame_interval.numerator,
1212                 imx274->frame_interval.denominator);
1213 
1214         return 0;
1215 }
1216 
1217 /**
1218  * imx274_s_frame_interval - Set the frame interval
1219  * @sd: Pointer to V4L2 Sub device structure
1220  * @fi: Pointer to V4l2 Sub device frame interval structure
1221  *
1222  * This function is used to set the frame intervavl.
1223  *
1224  * Return: 0 on success
1225  */
1226 static int imx274_s_frame_interval(struct v4l2_subdev *sd,
1227                                    struct v4l2_subdev_frame_interval *fi)
1228 {
1229         struct stimx274 *imx274 = to_imx274(sd);
1230         struct v4l2_ctrl *ctrl = imx274->ctrls.exposure;
1231         int min, max, def;
1232         int ret;
1233 
1234         mutex_lock(&imx274->lock);
1235         ret = imx274_set_frame_interval(imx274, fi->interval);
1236 
1237         if (!ret) {
1238                 /*
1239                  * exposure time range is decided by frame interval
1240                  * need to update it after frame interval changes
1241                  */
1242                 min = IMX274_MIN_EXPOSURE_TIME;
1243                 max = fi->interval.numerator * 1000000
1244                         / fi->interval.denominator;
1245                 def = max;
1246                 if (__v4l2_ctrl_modify_range(ctrl, min, max, 1, def)) {
1247                         dev_err(&imx274->client->dev,
1248                                 "Exposure ctrl range update failed\n");
1249                         goto unlock;
1250                 }
1251 
1252                 /* update exposure time accordingly */
1253                 imx274_set_exposure(imx274, ctrl->val);
1254 
1255                 dev_dbg(&imx274->client->dev, "set frame interval to %uus\n",
1256                         fi->interval.numerator * 1000000
1257                         / fi->interval.denominator);
1258         }
1259 
1260 unlock:
1261         mutex_unlock(&imx274->lock);
1262 
1263         return ret;
1264 }
1265 
1266 /**
1267  * imx274_load_default - load default control values
1268  * @priv: Pointer to device structure
1269  *
1270  * Return: 0 on success, errors otherwise
1271  */
1272 static int imx274_load_default(struct stimx274 *priv)
1273 {
1274         int ret;
1275 
1276         /* load default control values */
1277         priv->frame_interval.numerator = 1;
1278         priv->frame_interval.denominator = IMX274_DEF_FRAME_RATE;
1279         priv->ctrls.exposure->val = 1000000 / IMX274_DEF_FRAME_RATE;
1280         priv->ctrls.gain->val = IMX274_DEF_GAIN;
1281         priv->ctrls.vflip->val = 0;
1282         priv->ctrls.test_pattern->val = TEST_PATTERN_DISABLED;
1283 
1284         /* update frame rate */
1285         ret = imx274_set_frame_interval(priv,
1286                                         priv->frame_interval);
1287         if (ret)
1288                 return ret;
1289 
1290         /* update exposure time */
1291         ret = v4l2_ctrl_s_ctrl(priv->ctrls.exposure, priv->ctrls.exposure->val);
1292         if (ret)
1293                 return ret;
1294 
1295         /* update gain */
1296         ret = v4l2_ctrl_s_ctrl(priv->ctrls.gain, priv->ctrls.gain->val);
1297         if (ret)
1298                 return ret;
1299 
1300         /* update vflip */
1301         ret = v4l2_ctrl_s_ctrl(priv->ctrls.vflip, priv->ctrls.vflip->val);
1302         if (ret)
1303                 return ret;
1304 
1305         return 0;
1306 }
1307 
1308 /**
1309  * imx274_s_stream - It is used to start/stop the streaming.
1310  * @sd: V4L2 Sub device
1311  * @on: Flag (True / False)
1312  *
1313  * This function controls the start or stop of streaming for the
1314  * imx274 sensor.
1315  *
1316  * Return: 0 on success, errors otherwise
1317  */
1318 static int imx274_s_stream(struct v4l2_subdev *sd, int on)
1319 {
1320         struct stimx274 *imx274 = to_imx274(sd);
1321         int ret = 0;
1322 
1323         dev_dbg(&imx274->client->dev, "%s : %s, mode index = %td\n", __func__,
1324                 on ? "Stream Start" : "Stream Stop",
1325                 imx274->mode - &imx274_modes[0]);
1326 
1327         mutex_lock(&imx274->lock);
1328 
1329         if (on) {
1330                 /* load mode registers */
1331                 ret = imx274_mode_regs(imx274);
1332                 if (ret)
1333                         goto fail;
1334 
1335                 ret = imx274_apply_trimming(imx274);
1336                 if (ret)
1337                         goto fail;
1338 
1339                 /*
1340                  * update frame rate & expsoure. if the last mode is different,
1341                  * HMAX could be changed. As the result, frame rate & exposure
1342                  * are changed.
1343                  * gain is not affected.
1344                  */
1345                 ret = imx274_set_frame_interval(imx274,
1346                                                 imx274->frame_interval);
1347                 if (ret)
1348                         goto fail;
1349 
1350                 /* update exposure time */
1351                 ret = __v4l2_ctrl_s_ctrl(imx274->ctrls.exposure,
1352                                          imx274->ctrls.exposure->val);
1353                 if (ret)
1354                         goto fail;
1355 
1356                 /* start stream */
1357                 ret = imx274_start_stream(imx274);
1358                 if (ret)
1359                         goto fail;
1360         } else {
1361                 /* stop stream */
1362                 ret = imx274_write_table(imx274, imx274_stop);
1363                 if (ret)
1364                         goto fail;
1365         }
1366 
1367         mutex_unlock(&imx274->lock);
1368         dev_dbg(&imx274->client->dev, "%s : Done\n", __func__);
1369         return 0;
1370 
1371 fail:
1372         mutex_unlock(&imx274->lock);
1373         dev_err(&imx274->client->dev, "s_stream failed\n");
1374         return ret;
1375 }
1376 
1377 /*
1378  * imx274_get_frame_length - Function for obtaining current frame length
1379  * @priv: Pointer to device structure
1380  * @val: Pointer to obainted value
1381  *
1382  * frame_length = vmax x (svr + 1), in unit of hmax.
1383  *
1384  * Return: 0 on success
1385  */
1386 static int imx274_get_frame_length(struct stimx274 *priv, u32 *val)
1387 {
1388         int err;
1389         u32 svr;
1390         u32 vmax;
1391 
1392         err = imx274_read_mbreg(priv, IMX274_SVR_REG_LSB, &svr, 2);
1393         if (err)
1394                 goto fail;
1395 
1396         err = imx274_read_mbreg(priv, IMX274_VMAX_REG_3, &vmax, 3);
1397         if (err)
1398                 goto fail;
1399 
1400         *val = vmax * (svr + 1);
1401 
1402         return 0;
1403 
1404 fail:
1405         dev_err(&priv->client->dev, "%s error = %d\n", __func__, err);
1406         return err;
1407 }
1408 
1409 static int imx274_clamp_coarse_time(struct stimx274 *priv, u32 *val,
1410                                     u32 *frame_length)
1411 {
1412         int err;
1413 
1414         err = imx274_get_frame_length(priv, frame_length);
1415         if (err)
1416                 return err;
1417 
1418         if (*frame_length < priv->mode->min_frame_len)
1419                 *frame_length =  priv->mode->min_frame_len;
1420 
1421         *val = *frame_length - *val; /* convert to raw shr */
1422         if (*val > *frame_length - IMX274_SHR_LIMIT_CONST)
1423                 *val = *frame_length - IMX274_SHR_LIMIT_CONST;
1424         else if (*val < priv->mode->min_SHR)
1425                 *val = priv->mode->min_SHR;
1426 
1427         return 0;
1428 }
1429 
1430 /*
1431  * imx274_set_digital gain - Function called when setting digital gain
1432  * @priv: Pointer to device structure
1433  * @dgain: Value of digital gain.
1434  *
1435  * Digital gain has only 4 steps: 1x, 2x, 4x, and 8x
1436  *
1437  * Return: 0 on success
1438  */
1439 static int imx274_set_digital_gain(struct stimx274 *priv, u32 dgain)
1440 {
1441         u8 reg_val;
1442 
1443         reg_val = ffs(dgain);
1444 
1445         if (reg_val)
1446                 reg_val--;
1447 
1448         reg_val = clamp(reg_val, (u8)0, (u8)3);
1449 
1450         return imx274_write_reg(priv, IMX274_DIGITAL_GAIN_REG,
1451                                 reg_val & IMX274_MASK_LSB_4_BITS);
1452 }
1453 
1454 /*
1455  * imx274_set_gain - Function called when setting gain
1456  * @priv: Pointer to device structure
1457  * @val: Value of gain. the real value = val << IMX274_GAIN_SHIFT;
1458  * @ctrl: v4l2 control pointer
1459  *
1460  * Set the gain based on input value.
1461  * The caller should hold the mutex lock imx274->lock if necessary
1462  *
1463  * Return: 0 on success
1464  */
1465 static int imx274_set_gain(struct stimx274 *priv, struct v4l2_ctrl *ctrl)
1466 {
1467         int err;
1468         u32 gain, analog_gain, digital_gain, gain_reg;
1469 
1470         gain = (u32)(ctrl->val);
1471 
1472         dev_dbg(&priv->client->dev,
1473                 "%s : input gain = %d.%d\n", __func__,
1474                 gain >> IMX274_GAIN_SHIFT,
1475                 ((gain & IMX274_GAIN_SHIFT_MASK) * 100) >> IMX274_GAIN_SHIFT);
1476 
1477         if (gain > IMX274_MAX_DIGITAL_GAIN * IMX274_MAX_ANALOG_GAIN)
1478                 gain = IMX274_MAX_DIGITAL_GAIN * IMX274_MAX_ANALOG_GAIN;
1479         else if (gain < IMX274_MIN_GAIN)
1480                 gain = IMX274_MIN_GAIN;
1481 
1482         if (gain <= IMX274_MAX_ANALOG_GAIN)
1483                 digital_gain = 1;
1484         else if (gain <= IMX274_MAX_ANALOG_GAIN * 2)
1485                 digital_gain = 2;
1486         else if (gain <= IMX274_MAX_ANALOG_GAIN * 4)
1487                 digital_gain = 4;
1488         else
1489                 digital_gain = IMX274_MAX_DIGITAL_GAIN;
1490 
1491         analog_gain = gain / digital_gain;
1492 
1493         dev_dbg(&priv->client->dev,
1494                 "%s : digital gain = %d, analog gain = %d.%d\n",
1495                 __func__, digital_gain, analog_gain >> IMX274_GAIN_SHIFT,
1496                 ((analog_gain & IMX274_GAIN_SHIFT_MASK) * 100)
1497                 >> IMX274_GAIN_SHIFT);
1498 
1499         err = imx274_set_digital_gain(priv, digital_gain);
1500         if (err)
1501                 goto fail;
1502 
1503         /* convert to register value, refer to imx274 datasheet */
1504         gain_reg = (u32)IMX274_GAIN_CONST -
1505                 (IMX274_GAIN_CONST << IMX274_GAIN_SHIFT) / analog_gain;
1506         if (gain_reg > IMX274_GAIN_REG_MAX)
1507                 gain_reg = IMX274_GAIN_REG_MAX;
1508 
1509         err = imx274_write_mbreg(priv, IMX274_ANALOG_GAIN_ADDR_LSB, gain_reg,
1510                                  2);
1511         if (err)
1512                 goto fail;
1513 
1514         if (IMX274_GAIN_CONST - gain_reg == 0) {
1515                 err = -EINVAL;
1516                 goto fail;
1517         }
1518 
1519         /* convert register value back to gain value */
1520         ctrl->val = (IMX274_GAIN_CONST << IMX274_GAIN_SHIFT)
1521                         / (IMX274_GAIN_CONST - gain_reg) * digital_gain;
1522 
1523         dev_dbg(&priv->client->dev,
1524                 "%s : GAIN control success, gain_reg = %d, new gain = %d\n",
1525                 __func__, gain_reg, ctrl->val);
1526 
1527         return 0;
1528 
1529 fail:
1530         dev_err(&priv->client->dev, "%s error = %d\n", __func__, err);
1531         return err;
1532 }
1533 
1534 /*
1535  * imx274_set_coarse_time - Function called when setting SHR value
1536  * @priv: Pointer to device structure
1537  * @val: Value for exposure time in number of line_length, or [HMAX]
1538  *
1539  * Set SHR value based on input value.
1540  *
1541  * Return: 0 on success
1542  */
1543 static int imx274_set_coarse_time(struct stimx274 *priv, u32 *val)
1544 {
1545         int err;
1546         u32 coarse_time, frame_length;
1547 
1548         coarse_time = *val;
1549 
1550         /* convert exposure_time to appropriate SHR value */
1551         err = imx274_clamp_coarse_time(priv, &coarse_time, &frame_length);
1552         if (err)
1553                 goto fail;
1554 
1555         err = imx274_write_mbreg(priv, IMX274_SHR_REG_LSB, coarse_time, 2);
1556         if (err)
1557                 goto fail;
1558 
1559         *val = frame_length - coarse_time;
1560         return 0;
1561 
1562 fail:
1563         dev_err(&priv->client->dev, "%s error = %d\n", __func__, err);
1564         return err;
1565 }
1566 
1567 /*
1568  * imx274_set_exposure - Function called when setting exposure time
1569  * @priv: Pointer to device structure
1570  * @val: Variable for exposure time, in the unit of micro-second
1571  *
1572  * Set exposure time based on input value.
1573  * The caller should hold the mutex lock imx274->lock if necessary
1574  *
1575  * Return: 0 on success
1576  */
1577 static int imx274_set_exposure(struct stimx274 *priv, int val)
1578 {
1579         int err;
1580         u32 hmax;
1581         u32 coarse_time; /* exposure time in unit of line (HMAX)*/
1582 
1583         dev_dbg(&priv->client->dev,
1584                 "%s : EXPOSURE control input = %d\n", __func__, val);
1585 
1586         /* step 1: convert input exposure_time (val) into number of 1[HMAX] */
1587 
1588         err = imx274_read_mbreg(priv, IMX274_HMAX_REG_LSB, &hmax, 2);
1589         if (err)
1590                 goto fail;
1591 
1592         if (hmax == 0) {
1593                 err = -EINVAL;
1594                 goto fail;
1595         }
1596 
1597         coarse_time = (IMX274_PIXCLK_CONST1 / IMX274_PIXCLK_CONST2 * val
1598                         - priv->mode->nocpiop) / hmax;
1599 
1600         /* step 2: convert exposure_time into SHR value */
1601 
1602         /* set SHR */
1603         err = imx274_set_coarse_time(priv, &coarse_time);
1604         if (err)
1605                 goto fail;
1606 
1607         priv->ctrls.exposure->val =
1608                         (coarse_time * hmax + priv->mode->nocpiop)
1609                         / (IMX274_PIXCLK_CONST1 / IMX274_PIXCLK_CONST2);
1610 
1611         dev_dbg(&priv->client->dev,
1612                 "%s : EXPOSURE control success\n", __func__);
1613         return 0;
1614 
1615 fail:
1616         dev_err(&priv->client->dev, "%s error = %d\n", __func__, err);
1617 
1618         return err;
1619 }
1620 
1621 /*
1622  * imx274_set_vflip - Function called when setting vertical flip
1623  * @priv: Pointer to device structure
1624  * @val: Value for vflip setting
1625  *
1626  * Set vertical flip based on input value.
1627  * val = 0: normal, no vertical flip
1628  * val = 1: vertical flip enabled
1629  * The caller should hold the mutex lock imx274->lock if necessary
1630  *
1631  * Return: 0 on success
1632  */
1633 static int imx274_set_vflip(struct stimx274 *priv, int val)
1634 {
1635         int err;
1636 
1637         err = imx274_write_reg(priv, IMX274_VFLIP_REG, val);
1638         if (err) {
1639                 dev_err(&priv->client->dev, "VFLIP control error\n");
1640                 return err;
1641         }
1642 
1643         dev_dbg(&priv->client->dev,
1644                 "%s : VFLIP control success\n", __func__);
1645 
1646         return 0;
1647 }
1648 
1649 /*
1650  * imx274_set_test_pattern - Function called when setting test pattern
1651  * @priv: Pointer to device structure
1652  * @val: Variable for test pattern
1653  *
1654  * Set to different test patterns based on input value.
1655  *
1656  * Return: 0 on success
1657  */
1658 static int imx274_set_test_pattern(struct stimx274 *priv, int val)
1659 {
1660         int err = 0;
1661 
1662         if (val == TEST_PATTERN_DISABLED) {
1663                 err = imx274_write_table(priv, imx274_tp_disabled);
1664         } else if (val <= TEST_PATTERN_V_COLOR_BARS) {
1665                 err = imx274_write_reg(priv, IMX274_TEST_PATTERN_REG, val - 1);
1666                 if (!err)
1667                         err = imx274_write_table(priv, imx274_tp_regs);
1668         } else {
1669                 err = -EINVAL;
1670         }
1671 
1672         if (!err)
1673                 dev_dbg(&priv->client->dev,
1674                         "%s : TEST PATTERN control success\n", __func__);
1675         else
1676                 dev_err(&priv->client->dev, "%s error = %d\n", __func__, err);
1677 
1678         return err;
1679 }
1680 
1681 /*
1682  * imx274_set_frame_length - Function called when setting frame length
1683  * @priv: Pointer to device structure
1684  * @val: Variable for frame length (= VMAX, i.e. vertical drive period length)
1685  *
1686  * Set frame length based on input value.
1687  *
1688  * Return: 0 on success
1689  */
1690 static int imx274_set_frame_length(struct stimx274 *priv, u32 val)
1691 {
1692         int err;
1693         u32 frame_length;
1694 
1695         dev_dbg(&priv->client->dev, "%s : input length = %d\n",
1696                 __func__, val);
1697 
1698         frame_length = (u32)val;
1699 
1700         err = imx274_write_mbreg(priv, IMX274_VMAX_REG_3, frame_length, 3);
1701         if (err)
1702                 goto fail;
1703 
1704         return 0;
1705 
1706 fail:
1707         dev_err(&priv->client->dev, "%s error = %d\n", __func__, err);
1708         return err;
1709 }
1710 
1711 /*
1712  * imx274_set_frame_interval - Function called when setting frame interval
1713  * @priv: Pointer to device structure
1714  * @frame_interval: Variable for frame interval
1715  *
1716  * Change frame interval by updating VMAX value
1717  * The caller should hold the mutex lock imx274->lock if necessary
1718  *
1719  * Return: 0 on success
1720  */
1721 static int imx274_set_frame_interval(struct stimx274 *priv,
1722                                      struct v4l2_fract frame_interval)
1723 {
1724         int err;
1725         u32 frame_length, req_frame_rate;
1726         u32 svr;
1727         u32 hmax;
1728 
1729         dev_dbg(&priv->client->dev, "%s: input frame interval = %d / %d",
1730                 __func__, frame_interval.numerator,
1731                 frame_interval.denominator);
1732 
1733         if (frame_interval.numerator == 0) {
1734                 err = -EINVAL;
1735                 goto fail;
1736         }
1737 
1738         req_frame_rate = (u32)(frame_interval.denominator
1739                                 / frame_interval.numerator);
1740 
1741         /* boundary check */
1742         if (req_frame_rate > priv->mode->max_fps) {
1743                 frame_interval.numerator = 1;
1744                 frame_interval.denominator = priv->mode->max_fps;
1745         } else if (req_frame_rate < IMX274_MIN_FRAME_RATE) {
1746                 frame_interval.numerator = 1;
1747                 frame_interval.denominator = IMX274_MIN_FRAME_RATE;
1748         }
1749 
1750         /*
1751          * VMAX = 1/frame_rate x 72M / (SVR+1) / HMAX
1752          * frame_length (i.e. VMAX) = (frame_interval) x 72M /(SVR+1) / HMAX
1753          */
1754 
1755         err = imx274_read_mbreg(priv, IMX274_SVR_REG_LSB, &svr, 2);
1756         if (err)
1757                 goto fail;
1758 
1759         dev_dbg(&priv->client->dev,
1760                 "%s : register SVR = %d\n", __func__, svr);
1761 
1762         err = imx274_read_mbreg(priv, IMX274_HMAX_REG_LSB, &hmax, 2);
1763         if (err)
1764                 goto fail;
1765 
1766         dev_dbg(&priv->client->dev,
1767                 "%s : register HMAX = %d\n", __func__, hmax);
1768 
1769         if (hmax == 0 || frame_interval.denominator == 0) {
1770                 err = -EINVAL;
1771                 goto fail;
1772         }
1773 
1774         frame_length = IMX274_PIXCLK_CONST1 / (svr + 1) / hmax
1775                                         * frame_interval.numerator
1776                                         / frame_interval.denominator;
1777 
1778         err = imx274_set_frame_length(priv, frame_length);
1779         if (err)
1780                 goto fail;
1781 
1782         priv->frame_interval = frame_interval;
1783         return 0;
1784 
1785 fail:
1786         dev_err(&priv->client->dev, "%s error = %d\n", __func__, err);
1787         return err;
1788 }
1789 
1790 static const struct v4l2_subdev_pad_ops imx274_pad_ops = {
1791         .get_fmt = imx274_get_fmt,
1792         .set_fmt = imx274_set_fmt,
1793         .get_selection = imx274_get_selection,
1794         .set_selection = imx274_set_selection,
1795 };
1796 
1797 static const struct v4l2_subdev_video_ops imx274_video_ops = {
1798         .g_frame_interval = imx274_g_frame_interval,
1799         .s_frame_interval = imx274_s_frame_interval,
1800         .s_stream = imx274_s_stream,
1801 };
1802 
1803 static const struct v4l2_subdev_ops imx274_subdev_ops = {
1804         .pad = &imx274_pad_ops,
1805         .video = &imx274_video_ops,
1806 };
1807 
1808 static const struct v4l2_ctrl_ops imx274_ctrl_ops = {
1809         .s_ctrl = imx274_s_ctrl,
1810 };
1811 
1812 static const struct of_device_id imx274_of_id_table[] = {
1813         { .compatible = "sony,imx274" },
1814         { }
1815 };
1816 MODULE_DEVICE_TABLE(of, imx274_of_id_table);
1817 
1818 static const struct i2c_device_id imx274_id[] = {
1819         { "IMX274", 0 },
1820         { }
1821 };
1822 MODULE_DEVICE_TABLE(i2c, imx274_id);
1823 
1824 static int imx274_probe(struct i2c_client *client)
1825 {
1826         struct v4l2_subdev *sd;
1827         struct stimx274 *imx274;
1828         int ret;
1829 
1830         /* initialize imx274 */
1831         imx274 = devm_kzalloc(&client->dev, sizeof(*imx274), GFP_KERNEL);
1832         if (!imx274)
1833                 return -ENOMEM;
1834 
1835         mutex_init(&imx274->lock);
1836 
1837         /* initialize format */
1838         imx274->mode = &imx274_modes[IMX274_DEFAULT_BINNING];
1839         imx274->crop.width = IMX274_MAX_WIDTH;
1840         imx274->crop.height = IMX274_MAX_HEIGHT;
1841         imx274->format.width = imx274->crop.width / imx274->mode->bin_ratio;
1842         imx274->format.height = imx274->crop.height / imx274->mode->bin_ratio;
1843         imx274->format.field = V4L2_FIELD_NONE;
1844         imx274->format.code = MEDIA_BUS_FMT_SRGGB10_1X10;
1845         imx274->format.colorspace = V4L2_COLORSPACE_SRGB;
1846         imx274->frame_interval.numerator = 1;
1847         imx274->frame_interval.denominator = IMX274_DEF_FRAME_RATE;
1848 
1849         /* initialize regmap */
1850         imx274->regmap = devm_regmap_init_i2c(client, &imx274_regmap_config);
1851         if (IS_ERR(imx274->regmap)) {
1852                 dev_err(&client->dev,
1853                         "regmap init failed: %ld\n", PTR_ERR(imx274->regmap));
1854                 ret = -ENODEV;
1855                 goto err_regmap;
1856         }
1857 
1858         /* initialize subdevice */
1859         imx274->client = client;
1860         sd = &imx274->sd;
1861         v4l2_i2c_subdev_init(sd, client, &imx274_subdev_ops);
1862         sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE | V4L2_SUBDEV_FL_HAS_EVENTS;
1863 
1864         /* initialize subdev media pad */
1865         imx274->pad.flags = MEDIA_PAD_FL_SOURCE;
1866         sd->entity.function = MEDIA_ENT_F_CAM_SENSOR;
1867         ret = media_entity_pads_init(&sd->entity, 1, &imx274->pad);
1868         if (ret < 0) {
1869                 dev_err(&client->dev,
1870                         "%s : media entity init Failed %d\n", __func__, ret);
1871                 goto err_regmap;
1872         }
1873 
1874         /* initialize sensor reset gpio */
1875         imx274->reset_gpio = devm_gpiod_get_optional(&client->dev, "reset",
1876                                                      GPIOD_OUT_HIGH);
1877         if (IS_ERR(imx274->reset_gpio)) {
1878                 if (PTR_ERR(imx274->reset_gpio) != -EPROBE_DEFER)
1879                         dev_err(&client->dev, "Reset GPIO not setup in DT");
1880                 ret = PTR_ERR(imx274->reset_gpio);
1881                 goto err_me;
1882         }
1883 
1884         /* pull sensor out of reset */
1885         imx274_reset(imx274, 1);
1886 
1887         /* initialize controls */
1888         ret = v4l2_ctrl_handler_init(&imx274->ctrls.handler, 4);
1889         if (ret < 0) {
1890                 dev_err(&client->dev,
1891                         "%s : ctrl handler init Failed\n", __func__);
1892                 goto err_me;
1893         }
1894 
1895         imx274->ctrls.handler.lock = &imx274->lock;
1896 
1897         /* add new controls */
1898         imx274->ctrls.test_pattern = v4l2_ctrl_new_std_menu_items(
1899                 &imx274->ctrls.handler, &imx274_ctrl_ops,
1900                 V4L2_CID_TEST_PATTERN,
1901                 ARRAY_SIZE(tp_qmenu) - 1, 0, 0, tp_qmenu);
1902 
1903         imx274->ctrls.gain = v4l2_ctrl_new_std(
1904                 &imx274->ctrls.handler,
1905                 &imx274_ctrl_ops,
1906                 V4L2_CID_GAIN, IMX274_MIN_GAIN,
1907                 IMX274_MAX_DIGITAL_GAIN * IMX274_MAX_ANALOG_GAIN, 1,
1908                 IMX274_DEF_GAIN);
1909 
1910         imx274->ctrls.exposure = v4l2_ctrl_new_std(
1911                 &imx274->ctrls.handler,
1912                 &imx274_ctrl_ops,
1913                 V4L2_CID_EXPOSURE, IMX274_MIN_EXPOSURE_TIME,
1914                 1000000 / IMX274_DEF_FRAME_RATE, 1,
1915                 IMX274_MIN_EXPOSURE_TIME);
1916 
1917         imx274->ctrls.vflip = v4l2_ctrl_new_std(
1918                 &imx274->ctrls.handler,
1919                 &imx274_ctrl_ops,
1920                 V4L2_CID_VFLIP, 0, 1, 1, 0);
1921 
1922         imx274->sd.ctrl_handler = &imx274->ctrls.handler;
1923         if (imx274->ctrls.handler.error) {
1924                 ret = imx274->ctrls.handler.error;
1925                 goto err_ctrls;
1926         }
1927 
1928         /* setup default controls */
1929         ret = v4l2_ctrl_handler_setup(&imx274->ctrls.handler);
1930         if (ret) {
1931                 dev_err(&client->dev,
1932                         "Error %d setup default controls\n", ret);
1933                 goto err_ctrls;
1934         }
1935 
1936         /* load default control values */
1937         ret = imx274_load_default(imx274);
1938         if (ret) {
1939                 dev_err(&client->dev,
1940                         "%s : imx274_load_default failed %d\n",
1941                         __func__, ret);
1942                 goto err_ctrls;
1943         }
1944 
1945         /* register subdevice */
1946         ret = v4l2_async_register_subdev(sd);
1947         if (ret < 0) {
1948                 dev_err(&client->dev,
1949                         "%s : v4l2_async_register_subdev failed %d\n",
1950                         __func__, ret);
1951                 goto err_ctrls;
1952         }
1953 
1954         dev_info(&client->dev, "imx274 : imx274 probe success !\n");
1955         return 0;
1956 
1957 err_ctrls:
1958         v4l2_ctrl_handler_free(&imx274->ctrls.handler);
1959 err_me:
1960         media_entity_cleanup(&sd->entity);
1961 err_regmap:
1962         mutex_destroy(&imx274->lock);
1963         return ret;
1964 }
1965 
1966 static int imx274_remove(struct i2c_client *client)
1967 {
1968         struct v4l2_subdev *sd = i2c_get_clientdata(client);
1969         struct stimx274 *imx274 = to_imx274(sd);
1970 
1971         /* stop stream */
1972         imx274_write_table(imx274, imx274_stop);
1973 
1974         v4l2_async_unregister_subdev(sd);
1975         v4l2_ctrl_handler_free(&imx274->ctrls.handler);
1976         media_entity_cleanup(&sd->entity);
1977         mutex_destroy(&imx274->lock);
1978         return 0;
1979 }
1980 
1981 static struct i2c_driver imx274_i2c_driver = {
1982         .driver = {
1983                 .name   = DRIVER_NAME,
1984                 .of_match_table = imx274_of_id_table,
1985         },
1986         .probe_new      = imx274_probe,
1987         .remove         = imx274_remove,
1988         .id_table       = imx274_id,
1989 };
1990 
1991 module_i2c_driver(imx274_i2c_driver);
1992 
1993 MODULE_AUTHOR("Leon Luo <leonl@leopardimaging.com>");
1994 MODULE_DESCRIPTION("IMX274 CMOS Image Sensor driver");
1995 MODULE_LICENSE("GPL v2");
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/media/i2c/imx274.c

DEFINITIONS
