drivers/media/spi/gs1662.c

   1 /*
   2  * GS1662 device registration.
   3  *
   4  * Copyright (C) 2015-2016 Nexvision
   5  * Author: Charles-Antoine Couret <charles-antoine.couret@nexvision.fr>
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the
   9  * Free Software Foundation; either version 2 of the License, or (at your
  10  * option) any later version.
  11  */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/init.h>
  15 #include <linux/spi/spi.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/ctype.h>
  18 #include <linux/err.h>
  19 #include <linux/device.h>
  20 #include <linux/module.h>
  21
  22 #include <linux/videodev2.h>
  23 #include <media/v4l2-common.h>
  24 #include <media/v4l2-ctrls.h>
  25 #include <media/v4l2-device.h>
  26 #include <media/v4l2-subdev.h>
  27 #include <media/v4l2-dv-timings.h>
  28 #include <linux/v4l2-dv-timings.h>
  29
  30 #define REG_STATUS                      0x04
  31 #define REG_FORCE_FMT                   0x06
  32 #define REG_LINES_PER_FRAME             0x12
  33 #define REG_WORDS_PER_LINE              0x13
  34 #define REG_WORDS_PER_ACT_LINE          0x14
  35 #define REG_ACT_LINES_PER_FRAME 0x15
  36
  37 #define MASK_H_LOCK                     0x001
  38 #define MASK_V_LOCK                     0x002
  39 #define MASK_STD_LOCK                   0x004
  40 #define MASK_FORCE_STD                  0x020
  41 #define MASK_STD_STATUS         0x3E0
  42
  43 #define GS_WIDTH_MIN                    720
  44 #define GS_WIDTH_MAX                    2048
  45 #define GS_HEIGHT_MIN                   487
  46 #define GS_HEIGHT_MAX                   1080
  47 #define GS_PIXELCLOCK_MIN               10519200
  48 #define GS_PIXELCLOCK_MAX               74250000
  49
  50 struct gs {
  51         struct spi_device *pdev;
  52         struct v4l2_subdev sd;
  53         struct v4l2_dv_timings current_timings;
  54         int enabled;
  55 };
  56
  57 struct gs_reg_fmt {
  58         u16 reg_value;
  59         struct v4l2_dv_timings format;
  60 };
  61
  62 struct gs_reg_fmt_custom {
  63         u16 reg_value;
  64         __u32 width;
  65         __u32 height;
  66         __u64 pixelclock;
  67         __u32 interlaced;
  68 };
  69
  70 static const struct spi_device_id gs_id[] = {
  71         { "gs1662", 0 },
  72         { }
  73 };
  74 MODULE_DEVICE_TABLE(spi, gs_id);
  75
  76 static const struct v4l2_dv_timings fmt_cap[] = {
  77         V4L2_DV_BT_SDI_720X487I60,
  78         V4L2_DV_BT_CEA_720X576P50,
  79         V4L2_DV_BT_CEA_1280X720P24,
  80         V4L2_DV_BT_CEA_1280X720P25,
  81         V4L2_DV_BT_CEA_1280X720P30,
  82         V4L2_DV_BT_CEA_1280X720P50,
  83         V4L2_DV_BT_CEA_1280X720P60,
  84         V4L2_DV_BT_CEA_1920X1080P24,
  85         V4L2_DV_BT_CEA_1920X1080P25,
  86         V4L2_DV_BT_CEA_1920X1080P30,
  87         V4L2_DV_BT_CEA_1920X1080I50,
  88         V4L2_DV_BT_CEA_1920X1080I60,
  89 };
  90
  91 static const struct gs_reg_fmt reg_fmt[] = {
  92         { 0x00, V4L2_DV_BT_CEA_1280X720P60 },
  93         { 0x01, V4L2_DV_BT_CEA_1280X720P60 },
  94         { 0x02, V4L2_DV_BT_CEA_1280X720P30 },
  95         { 0x03, V4L2_DV_BT_CEA_1280X720P30 },
  96         { 0x04, V4L2_DV_BT_CEA_1280X720P50 },
  97         { 0x05, V4L2_DV_BT_CEA_1280X720P50 },
  98         { 0x06, V4L2_DV_BT_CEA_1280X720P25 },
  99         { 0x07, V4L2_DV_BT_CEA_1280X720P25 },
 100         { 0x08, V4L2_DV_BT_CEA_1280X720P24 },
 101         { 0x09, V4L2_DV_BT_CEA_1280X720P24 },
 102         { 0x0A, V4L2_DV_BT_CEA_1920X1080I60 },
 103         { 0x0B, V4L2_DV_BT_CEA_1920X1080P30 },
 104
 105         /* Default value: keep this field before 0xC */
 106         { 0x14, V4L2_DV_BT_CEA_1920X1080I50 },
 107         { 0x0C, V4L2_DV_BT_CEA_1920X1080I50 },
 108         { 0x0D, V4L2_DV_BT_CEA_1920X1080P25 },
 109         { 0x0E, V4L2_DV_BT_CEA_1920X1080P25 },
 110         { 0x10, V4L2_DV_BT_CEA_1920X1080P24 },
 111         { 0x12, V4L2_DV_BT_CEA_1920X1080P24 },
 112         { 0x16, V4L2_DV_BT_SDI_720X487I60 },
 113         { 0x19, V4L2_DV_BT_SDI_720X487I60 },
 114         { 0x18, V4L2_DV_BT_CEA_720X576P50 },
 115         { 0x1A, V4L2_DV_BT_CEA_720X576P50 },
 116
 117         /* Implement following timings before enable it.
 118          * Because of we don't have access to these theoretical timings yet.
 119          * Workaround: use functions to get and set registers for these formats.
 120          */
 121 #if 0
 122         { 0x0F, V4L2_DV_BT_XXX_1920X1080I25 }, /* SMPTE 274M */
 123         { 0x11, V4L2_DV_BT_XXX_1920X1080I24 }, /* SMPTE 274M */
 124         { 0x13, V4L2_DV_BT_XXX_1920X1080I25 }, /* SMPTE 274M */
 125         { 0x15, V4L2_DV_BT_XXX_1920X1035I60 }, /* SMPTE 260M */
 126         { 0x17, V4L2_DV_BT_SDI_720X507I60 }, /* SMPTE 125M */
 127         { 0x1B, V4L2_DV_BT_SDI_720X507I60 }, /* SMPTE 125M */
 128         { 0x1C, V4L2_DV_BT_XXX_2048X1080P25 }, /* SMPTE 428.1M */
 129 #endif
 130 };
 131
 132 static const struct v4l2_dv_timings_cap gs_timings_cap = {
 133         .type = V4L2_DV_BT_656_1120,
 134         /* keep this initialization for compatibility with GCC < 4.4.6 */
 135         .reserved = { 0 },
 136         V4L2_INIT_BT_TIMINGS(GS_WIDTH_MIN, GS_WIDTH_MAX, GS_HEIGHT_MIN,
 137                              GS_HEIGHT_MAX, GS_PIXELCLOCK_MIN,
 138                              GS_PIXELCLOCK_MAX,
 139                              V4L2_DV_BT_STD_CEA861 | V4L2_DV_BT_STD_SDI,
 140                              V4L2_DV_BT_CAP_PROGRESSIVE
 141                              | V4L2_DV_BT_CAP_INTERLACED)
 142 };
 143
 144 static int gs_read_register(struct spi_device *spi, u16 addr, u16 *value)
 145 {
 146         int ret;
 147         u16 buf_addr = (0x8000 | (0x0FFF & addr));
 148         u16 buf_value = 0;
 149         struct spi_message msg;
 150         struct spi_transfer tx[] = {
 151                 {
 152                         .tx_buf = &buf_addr,
 153                         .len = 2,
 154                         .delay_usecs = 1,
 155                 }, {
 156                         .rx_buf = &buf_value,
 157                         .len = 2,
 158                         .delay_usecs = 1,
 159                 },
 160         };
 161
 162         spi_message_init(&msg);
 163         spi_message_add_tail(&tx[0], &msg);
 164         spi_message_add_tail(&tx[1], &msg);
 165         ret = spi_sync(spi, &msg);
 166
 167         *value = buf_value;
 168
 169         return ret;
 170 }
 171
 172 static int gs_write_register(struct spi_device *spi, u16 addr, u16 value)
 173 {
 174         int ret;
 175         u16 buf_addr = addr;
 176         u16 buf_value = value;
 177         struct spi_message msg;
 178         struct spi_transfer tx[] = {
 179                 {
 180                         .tx_buf = &buf_addr,
 181                         .len = 2,
 182                         .delay_usecs = 1,
 183                 }, {
 184                         .tx_buf = &buf_value,
 185                         .len = 2,
 186                         .delay_usecs = 1,
 187                 },
 188         };
 189
 190         spi_message_init(&msg);
 191         spi_message_add_tail(&tx[0], &msg);
 192         spi_message_add_tail(&tx[1], &msg);
 193         ret = spi_sync(spi, &msg);
 194
 195         return ret;
 196 }
 197
 198 #ifdef CONFIG_VIDEO_ADV_DEBUG
 199 static int gs_g_register(struct v4l2_subdev *sd,
 200                   struct v4l2_dbg_register *reg)
 201 {
 202         struct spi_device *spi = v4l2_get_subdevdata(sd);
 203         u16 val;
 204         int ret;
 205
 206         ret = gs_read_register(spi, reg->reg & 0xFFFF, &val);
 207         reg->val = val;
 208         reg->size = 2;
 209         return ret;
 210 }
 211
 212 static int gs_s_register(struct v4l2_subdev *sd,
 213                   const struct v4l2_dbg_register *reg)
 214 {
 215         struct spi_device *spi = v4l2_get_subdevdata(sd);
 216
 217         return gs_write_register(spi, reg->reg & 0xFFFF, reg->val & 0xFFFF);
 218 }
 219 #endif
 220
 221 static int gs_status_format(u16 status, struct v4l2_dv_timings *timings)
 222 {
 223         int std = (status & MASK_STD_STATUS) >> 5;
 224         int i;
 225
 226         for (i = 0; i < ARRAY_SIZE(reg_fmt); i++) {
 227                 if (reg_fmt[i].reg_value == std) {
 228                         *timings = reg_fmt[i].format;
 229                         return 0;
 230                 }
 231         }
 232
 233         return -ERANGE;
 234 }
 235
 236 static u16 get_register_timings(struct v4l2_dv_timings *timings)
 237 {
 238         int i;
 239
 240         for (i = 0; i < ARRAY_SIZE(reg_fmt); i++) {
 241                 if (v4l2_match_dv_timings(timings, &reg_fmt[i].format, 0,
 242                                           false))
 243                         return reg_fmt[i].reg_value | MASK_FORCE_STD;
 244         }
 245
 246         return 0x0;
 247 }
 248
 249 static inline struct gs *to_gs(struct v4l2_subdev *sd)
 250 {
 251         return container_of(sd, struct gs, sd);
 252 }
 253
 254 static int gs_s_dv_timings(struct v4l2_subdev *sd,
 255                     struct v4l2_dv_timings *timings)
 256 {
 257         struct gs *gs = to_gs(sd);
 258         int reg_value;
 259
 260         reg_value = get_register_timings(timings);
 261         if (reg_value == 0x0)
 262                 return -EINVAL;
 263
 264         gs->current_timings = *timings;
 265         return 0;
 266 }
 267
 268 static int gs_g_dv_timings(struct v4l2_subdev *sd,
 269                     struct v4l2_dv_timings *timings)
 270 {
 271         struct gs *gs = to_gs(sd);
 272
 273         *timings = gs->current_timings;
 274         return 0;
 275 }
 276
 277 static int gs_query_dv_timings(struct v4l2_subdev *sd,
 278                         struct v4l2_dv_timings *timings)
 279 {
 280         struct gs *gs = to_gs(sd);
 281         struct v4l2_dv_timings fmt;
 282         u16 reg_value, i;
 283         int ret;
 284
 285         if (gs->enabled)
 286                 return -EBUSY;
 287
 288         /*
 289          * Check if the component detect a line, a frame or something else
 290          * which looks like a video signal activity.
 291          */
 292         for (i = 0; i < 4; i++) {
 293                 gs_read_register(gs->pdev, REG_LINES_PER_FRAME + i, &reg_value);
 294                 if (reg_value)
 295                         break;
 296         }
 297
 298         /* If no register reports a video signal */
 299         if (i >= 4)
 300                 return -ENOLINK;
 301
 302         gs_read_register(gs->pdev, REG_STATUS, &reg_value);
 303         if (!(reg_value & MASK_H_LOCK) || !(reg_value & MASK_V_LOCK))
 304                 return -ENOLCK;
 305         if (!(reg_value & MASK_STD_LOCK))
 306                 return -ERANGE;
 307
 308         ret = gs_status_format(reg_value, &fmt);
 309
 310         if (ret < 0)
 311                 return ret;
 312
 313         *timings = fmt;
 314         return 0;
 315 }
 316
 317 static int gs_enum_dv_timings(struct v4l2_subdev *sd,
 318                        struct v4l2_enum_dv_timings *timings)
 319 {
 320         if (timings->index >= ARRAY_SIZE(fmt_cap))
 321                 return -EINVAL;
 322
 323         if (timings->pad != 0)
 324                 return -EINVAL;
 325
 326         timings->timings = fmt_cap[timings->index];
 327         return 0;
 328 }
 329
 330 static int gs_s_stream(struct v4l2_subdev *sd, int enable)
 331 {
 332         struct gs *gs = to_gs(sd);
 333         int reg_value;
 334
 335         if (gs->enabled == enable)
 336                 return 0;
 337
 338         gs->enabled = enable;
 339
 340         if (enable) {
 341                 /* To force the specific format */
 342                 reg_value = get_register_timings(&gs->current_timings);
 343                 return gs_write_register(gs->pdev, REG_FORCE_FMT, reg_value);
 344         }
 345
 346         /* To renable auto-detection mode */
 347         return gs_write_register(gs->pdev, REG_FORCE_FMT, 0x0);
 348 }
 349
 350 static int gs_g_input_status(struct v4l2_subdev *sd, u32 *status)
 351 {
 352         struct gs *gs = to_gs(sd);
 353         u16 reg_value, i;
 354         int ret;
 355
 356         /*
 357          * Check if the component detect a line, a frame or something else
 358          * which looks like a video signal activity.
 359          */
 360         for (i = 0; i < 4; i++) {
 361                 ret = gs_read_register(gs->pdev,
 362                                        REG_LINES_PER_FRAME + i, &reg_value);
 363                 if (reg_value)
 364                         break;
 365                 if (ret) {
 366                         *status = V4L2_IN_ST_NO_POWER;
 367                         return ret;
 368                 }
 369         }
 370
 371         /* If no register reports a video signal */
 372         if (i >= 4)
 373                 *status |= V4L2_IN_ST_NO_SIGNAL;
 374
 375         ret = gs_read_register(gs->pdev, REG_STATUS, &reg_value);
 376         if (!(reg_value & MASK_H_LOCK))
 377                 *status |=  V4L2_IN_ST_NO_H_LOCK;
 378         if (!(reg_value & MASK_V_LOCK))
 379                 *status |=  V4L2_IN_ST_NO_V_LOCK;
 380         if (!(reg_value & MASK_STD_LOCK))
 381                 *status |=  V4L2_IN_ST_NO_STD_LOCK;
 382
 383         return ret;
 384 }
 385
 386 static int gs_dv_timings_cap(struct v4l2_subdev *sd,
 387                              struct v4l2_dv_timings_cap *cap)
 388 {
 389         if (cap->pad != 0)
 390                 return -EINVAL;
 391
 392         *cap = gs_timings_cap;
 393         return 0;
 394 }
 395
 396 /* V4L2 core operation handlers */
 397 static const struct v4l2_subdev_core_ops gs_core_ops = {
 398 #ifdef CONFIG_VIDEO_ADV_DEBUG
 399         .g_register = gs_g_register,
 400         .s_register = gs_s_register,
 401 #endif
 402 };
 403
 404 static const struct v4l2_subdev_video_ops gs_video_ops = {
 405         .s_dv_timings = gs_s_dv_timings,
 406         .g_dv_timings = gs_g_dv_timings,
 407         .s_stream = gs_s_stream,
 408         .g_input_status = gs_g_input_status,
 409         .query_dv_timings = gs_query_dv_timings,
 410 };
 411
 412 static const struct v4l2_subdev_pad_ops gs_pad_ops = {
 413         .enum_dv_timings = gs_enum_dv_timings,
 414         .dv_timings_cap = gs_dv_timings_cap,
 415 };
 416
 417 /* V4L2 top level operation handlers */
 418 static const struct v4l2_subdev_ops gs_ops = {
 419         .core = &gs_core_ops,
 420         .video = &gs_video_ops,
 421         .pad = &gs_pad_ops,
 422 };
 423
 424 static int gs_probe(struct spi_device *spi)
 425 {
 426         int ret;
 427         struct gs *gs;
 428         struct v4l2_subdev *sd;
 429
 430         gs = devm_kzalloc(&spi->dev, sizeof(struct gs), GFP_KERNEL);
 431         if (!gs)
 432                 return -ENOMEM;
 433
 434         gs->pdev = spi;
 435         sd = &gs->sd;
 436
 437         spi->mode = SPI_MODE_0;
 438         spi->irq = -1;
 439         spi->max_speed_hz = 10000000;
 440         spi->bits_per_word = 16;
 441         ret = spi_setup(spi);
 442         v4l2_spi_subdev_init(sd, spi, &gs_ops);
 443
 444         gs->current_timings = reg_fmt[0].format;
 445         gs->enabled = 0;
 446
 447         /* Set H_CONFIG to SMPTE timings */
 448         gs_write_register(spi, 0x0, 0x300);
 449
 450         return ret;
 451 }
 452
 453 static int gs_remove(struct spi_device *spi)
 454 {
 455         struct v4l2_subdev *sd = spi_get_drvdata(spi);
 456
 457         v4l2_device_unregister_subdev(sd);
 458
 459         return 0;
 460 }
 461
 462 static struct spi_driver gs_driver = {
 463         .driver = {
 464                 .name           = "gs1662",
 465         },
 466
 467         .probe          = gs_probe,
 468         .remove         = gs_remove,
 469         .id_table       = gs_id,
 470 };
 471
 472 module_spi_driver(gs_driver);
 473
 474 MODULE_LICENSE("GPL");
 475 MODULE_AUTHOR("Charles-Antoine Couret <charles-antoine.couret@nexvision.fr>");
 476 MODULE_DESCRIPTION("Gennum GS1662 HD/SD-SDI Serializer driver");