drivers/media/i2c/ths8200.c

   1 /*
   2  * ths8200 - Texas Instruments THS8200 video encoder driver
   3  *
   4  * Copyright 2013 Cisco Systems, Inc. and/or its affiliates.
   5  *
   6  * This program is free software; you may redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; version 2 of the License.
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License as
  12  * published by the Free Software Foundation version 2.
  13  *
  14  * This program is distributed .as is. WITHOUT ANY WARRANTY of any
  15  * kind, whether express or implied; without even the implied warranty
  16  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  */
  19
  20 #include <linux/i2c.h>
  21 #include <linux/module.h>
  22 #include <linux/of.h>
  23 #include <linux/v4l2-dv-timings.h>
  24
  25 #include <media/v4l2-dv-timings.h>
  26 #include <media/v4l2-async.h>
  27 #include <media/v4l2-device.h>
  28
  29 #include "ths8200_regs.h"
  30
  31 static int debug;
  32 module_param(debug, int, 0644);
  33 MODULE_PARM_DESC(debug, "debug level (0-2)");
  34
  35 MODULE_DESCRIPTION("Texas Instruments THS8200 video encoder driver");
  36 MODULE_AUTHOR("Mats Randgaard <mats.randgaard@cisco.com>");
  37 MODULE_AUTHOR("Martin Bugge <martin.bugge@cisco.com>");
  38 MODULE_LICENSE("GPL v2");
  39
  40 struct ths8200_state {
  41         struct v4l2_subdev sd;
  42         uint8_t chip_version;
  43         /* Is the ths8200 powered on? */
  44         bool power_on;
  45         struct v4l2_dv_timings dv_timings;
  46 };
  47
  48 static const struct v4l2_dv_timings_cap ths8200_timings_cap = {
  49         .type = V4L2_DV_BT_656_1120,
  50         /* keep this initialization for compatibility with GCC < 4.4.6 */
  51         .reserved = { 0 },
  52         V4L2_INIT_BT_TIMINGS(0, 1920, 0, 1080, 25000000, 148500000,
  53                 V4L2_DV_BT_STD_CEA861, V4L2_DV_BT_CAP_PROGRESSIVE)
  54 };
  55
  56 static inline struct ths8200_state *to_state(struct v4l2_subdev *sd)
  57 {
  58         return container_of(sd, struct ths8200_state, sd);
  59 }
  60
  61 static inline unsigned hblanking(const struct v4l2_bt_timings *t)
  62 {
  63         return V4L2_DV_BT_BLANKING_WIDTH(t);
  64 }
  65
  66 static inline unsigned htotal(const struct v4l2_bt_timings *t)
  67 {
  68         return V4L2_DV_BT_FRAME_WIDTH(t);
  69 }
  70
  71 static inline unsigned vblanking(const struct v4l2_bt_timings *t)
  72 {
  73         return V4L2_DV_BT_BLANKING_HEIGHT(t);
  74 }
  75
  76 static inline unsigned vtotal(const struct v4l2_bt_timings *t)
  77 {
  78         return V4L2_DV_BT_FRAME_HEIGHT(t);
  79 }
  80
  81 static int ths8200_read(struct v4l2_subdev *sd, u8 reg)
  82 {
  83         struct i2c_client *client = v4l2_get_subdevdata(sd);
  84
  85         return i2c_smbus_read_byte_data(client, reg);
  86 }
  87
  88 static int ths8200_write(struct v4l2_subdev *sd, u8 reg, u8 val)
  89 {
  90         struct i2c_client *client = v4l2_get_subdevdata(sd);
  91         int ret;
  92         int i;
  93
  94         for (i = 0; i < 3; i++) {
  95                 ret = i2c_smbus_write_byte_data(client, reg, val);
  96                 if (ret == 0)
  97                         return 0;
  98         }
  99         v4l2_err(sd, "I2C Write Problem\n");
 100         return ret;
 101 }
 102
 103 /* To set specific bits in the register, a clear-mask is given (to be AND-ed),
 104  * and then the value-mask (to be OR-ed).
 105  */
 106 static inline void
 107 ths8200_write_and_or(struct v4l2_subdev *sd, u8 reg,
 108                      uint8_t clr_mask, uint8_t val_mask)
 109 {
 110         ths8200_write(sd, reg, (ths8200_read(sd, reg) & clr_mask) | val_mask);
 111 }
 112
 113 #ifdef CONFIG_VIDEO_ADV_DEBUG
 114
 115 static int ths8200_g_register(struct v4l2_subdev *sd,
 116                               struct v4l2_dbg_register *reg)
 117 {
 118         reg->val = ths8200_read(sd, reg->reg & 0xff);
 119         reg->size = 1;
 120
 121         return 0;
 122 }
 123
 124 static int ths8200_s_register(struct v4l2_subdev *sd,
 125                               const struct v4l2_dbg_register *reg)
 126 {
 127         ths8200_write(sd, reg->reg & 0xff, reg->val & 0xff);
 128
 129         return 0;
 130 }
 131 #endif
 132
 133 static int ths8200_log_status(struct v4l2_subdev *sd)
 134 {
 135         struct ths8200_state *state = to_state(sd);
 136         uint8_t reg_03 = ths8200_read(sd, THS8200_CHIP_CTL);
 137
 138         v4l2_info(sd, "----- Chip status -----\n");
 139         v4l2_info(sd, "version: %u\n", state->chip_version);
 140         v4l2_info(sd, "power: %s\n", (reg_03 & 0x0c) ? "off" : "on");
 141         v4l2_info(sd, "reset: %s\n", (reg_03 & 0x01) ? "off" : "on");
 142         v4l2_info(sd, "test pattern: %s\n",
 143                   (reg_03 & 0x20) ? "enabled" : "disabled");
 144         v4l2_info(sd, "format: %ux%u\n",
 145                   ths8200_read(sd, THS8200_DTG2_PIXEL_CNT_MSB) * 256 +
 146                   ths8200_read(sd, THS8200_DTG2_PIXEL_CNT_LSB),
 147                   (ths8200_read(sd, THS8200_DTG2_LINE_CNT_MSB) & 0x07) * 256 +
 148                   ths8200_read(sd, THS8200_DTG2_LINE_CNT_LSB));
 149         v4l2_print_dv_timings(sd->name, "Configured format:",
 150                               &state->dv_timings, true);
 151         return 0;
 152 }
 153
 154 /* Power up/down ths8200 */
 155 static int ths8200_s_power(struct v4l2_subdev *sd, int on)
 156 {
 157         struct ths8200_state *state = to_state(sd);
 158
 159         v4l2_dbg(1, debug, sd, "%s: power %s\n", __func__, on ? "on" : "off");
 160
 161         state->power_on = on;
 162
 163         /* Power up/down - leave in reset state until input video is present */
 164         ths8200_write_and_or(sd, THS8200_CHIP_CTL, 0xf2, (on ? 0x00 : 0x0c));
 165
 166         return 0;
 167 }
 168
 169 static const struct v4l2_subdev_core_ops ths8200_core_ops = {
 170         .log_status = ths8200_log_status,
 171         .s_power = ths8200_s_power,
 172 #ifdef CONFIG_VIDEO_ADV_DEBUG
 173         .g_register = ths8200_g_register,
 174         .s_register = ths8200_s_register,
 175 #endif
 176 };
 177
 178 /* -----------------------------------------------------------------------------
 179  * V4L2 subdev video operations
 180  */
 181
 182 static int ths8200_s_stream(struct v4l2_subdev *sd, int enable)
 183 {
 184         struct ths8200_state *state = to_state(sd);
 185
 186         if (enable && !state->power_on)
 187                 ths8200_s_power(sd, true);
 188
 189         ths8200_write_and_or(sd, THS8200_CHIP_CTL, 0xfe,
 190                              (enable ? 0x01 : 0x00));
 191
 192         v4l2_dbg(1, debug, sd, "%s: %sable\n",
 193                  __func__, (enable ? "en" : "dis"));
 194
 195         return 0;
 196 }
 197
 198 static void ths8200_core_init(struct v4l2_subdev *sd)
 199 {
 200         /* setup clocks */
 201         ths8200_write_and_or(sd, THS8200_CHIP_CTL, 0x3f, 0xc0);
 202
 203         /**** Data path control (DATA) ****/
 204         /* Set FSADJ 700 mV,
 205          * bypass 422-444 interpolation,
 206          * input format 30 bit RGB444
 207          */
 208         ths8200_write(sd, THS8200_DATA_CNTL, 0x70);
 209
 210         /* DTG Mode (Video blocked during blanking
 211          * VESA slave
 212          */
 213         ths8200_write(sd, THS8200_DTG1_MODE, 0x87);
 214
 215         /**** Display Timing Generator Control, Part 1 (DTG1). ****/
 216
 217         /* Disable embedded syncs on the output by setting
 218          * the amplitude to zero for all channels.
 219          */
 220         ths8200_write(sd, THS8200_DTG1_Y_SYNC_MSB, 0x00);
 221         ths8200_write(sd, THS8200_DTG1_CBCR_SYNC_MSB, 0x00);
 222 }
 223
 224 static void ths8200_setup(struct v4l2_subdev *sd, struct v4l2_bt_timings *bt)
 225 {
 226         uint8_t polarity = 0;
 227         uint16_t line_start_active_video = (bt->vsync + bt->vbackporch);
 228         uint16_t line_start_front_porch  = (vtotal(bt) - bt->vfrontporch);
 229
 230         /*** System ****/
 231         /* Set chip in reset while it is configured */
 232         ths8200_s_stream(sd, false);
 233
 234         /* configure video output timings */
 235         ths8200_write(sd, THS8200_DTG1_SPEC_A, bt->hsync);
 236         ths8200_write(sd, THS8200_DTG1_SPEC_B, bt->hfrontporch);
 237
 238         /* Zero for progressive scan formats.*/
 239         if (!bt->interlaced)
 240                 ths8200_write(sd, THS8200_DTG1_SPEC_C, 0x00);
 241
 242         /* Distance from leading edge of h sync to start of active video.
 243          * MSB in 0x2b
 244          */
 245         ths8200_write(sd, THS8200_DTG1_SPEC_D_LSB,
 246                       (bt->hbackporch + bt->hsync) & 0xff);
 247         /* Zero for SDTV-mode. MSB in 0x2b */
 248         ths8200_write(sd, THS8200_DTG1_SPEC_E_LSB, 0x00);
 249         /*
 250          * MSB for dtg1_spec(d/e/h). See comment for
 251          * corresponding LSB registers.
 252          */
 253         ths8200_write(sd, THS8200_DTG1_SPEC_DEH_MSB,
 254                       ((bt->hbackporch + bt->hsync) & 0x100) >> 1);
 255
 256         /* h front porch */
 257         ths8200_write(sd, THS8200_DTG1_SPEC_K_LSB, (bt->hfrontporch) & 0xff);
 258         ths8200_write(sd, THS8200_DTG1_SPEC_K_MSB,
 259                       ((bt->hfrontporch) & 0x700) >> 8);
 260
 261         /* Half the line length. Used to calculate SDTV line types. */
 262         ths8200_write(sd, THS8200_DTG1_SPEC_G_LSB, (htotal(bt)/2) & 0xff);
 263         ths8200_write(sd, THS8200_DTG1_SPEC_G_MSB,
 264                       ((htotal(bt)/2) >> 8) & 0x0f);
 265
 266         /* Total pixels per line (ex. 720p: 1650) */
 267         ths8200_write(sd, THS8200_DTG1_TOT_PIXELS_MSB, htotal(bt) >> 8);
 268         ths8200_write(sd, THS8200_DTG1_TOT_PIXELS_LSB, htotal(bt) & 0xff);
 269
 270         /* Frame height and field height */
 271         /* Field height should be programmed higher than frame_size for
 272          * progressive scan formats
 273          */
 274         ths8200_write(sd, THS8200_DTG1_FRAME_FIELD_SZ_MSB,
 275                       ((vtotal(bt) >> 4) & 0xf0) + 0x7);
 276         ths8200_write(sd, THS8200_DTG1_FRAME_SZ_LSB, vtotal(bt) & 0xff);
 277
 278         /* Should be programmed higher than frame_size
 279          * for progressive formats
 280          */
 281         if (!bt->interlaced)
 282                 ths8200_write(sd, THS8200_DTG1_FIELD_SZ_LSB, 0xff);
 283
 284         /**** Display Timing Generator Control, Part 2 (DTG2). ****/
 285         /* Set breakpoint line numbers and types
 286          * THS8200 generates line types with different properties. A line type
 287          * that sets all the RGB-outputs to zero is used in the blanking areas,
 288          * while a line type that enable the RGB-outputs is used in active video
 289          * area. The line numbers for start of active video, start of front
 290          * porch and after the last line in the frame must be set with the
 291          * corresponding line types.
 292          *
 293          * Line types:
 294          * 0x9 - Full normal sync pulse: Blocks data when dtg1_pass is off.
 295          *       Used in blanking area.
 296          * 0x0 - Active video: Video data is always passed. Used in active
 297          *       video area.
 298          */
 299         ths8200_write_and_or(sd, THS8200_DTG2_BP1_2_MSB, 0x88,
 300                              ((line_start_active_video >> 4) & 0x70) +
 301                              ((line_start_front_porch >> 8) & 0x07));
 302         ths8200_write(sd, THS8200_DTG2_BP3_4_MSB, ((vtotal(bt)) >> 4) & 0x70);
 303         ths8200_write(sd, THS8200_DTG2_BP1_LSB, line_start_active_video & 0xff);
 304         ths8200_write(sd, THS8200_DTG2_BP2_LSB, line_start_front_porch & 0xff);
 305         ths8200_write(sd, THS8200_DTG2_BP3_LSB, (vtotal(bt)) & 0xff);
 306
 307         /* line types */
 308         ths8200_write(sd, THS8200_DTG2_LINETYPE1, 0x90);
 309         ths8200_write(sd, THS8200_DTG2_LINETYPE2, 0x90);
 310
 311         /* h sync width transmitted */
 312         ths8200_write(sd, THS8200_DTG2_HLENGTH_LSB, bt->hsync & 0xff);
 313         ths8200_write_and_or(sd, THS8200_DTG2_HLENGTH_LSB_HDLY_MSB, 0x3f,
 314                              (bt->hsync >> 2) & 0xc0);
 315
 316         /* The pixel value h sync is asserted on */
 317         ths8200_write_and_or(sd, THS8200_DTG2_HLENGTH_LSB_HDLY_MSB, 0xe0,
 318                              (htotal(bt) >> 8) & 0x1f);
 319         ths8200_write(sd, THS8200_DTG2_HLENGTH_HDLY_LSB, htotal(bt));
 320
 321         /* v sync width transmitted (must add 1 to get correct output) */
 322         ths8200_write(sd, THS8200_DTG2_VLENGTH1_LSB, (bt->vsync + 1) & 0xff);
 323         ths8200_write_and_or(sd, THS8200_DTG2_VLENGTH1_MSB_VDLY1_MSB, 0x3f,
 324                              ((bt->vsync + 1) >> 2) & 0xc0);
 325
 326         /* The pixel value v sync is asserted on (must add 1 to get correct output) */
 327         ths8200_write_and_or(sd, THS8200_DTG2_VLENGTH1_MSB_VDLY1_MSB, 0xf8,
 328                              ((vtotal(bt) + 1) >> 8) & 0x7);
 329         ths8200_write(sd, THS8200_DTG2_VDLY1_LSB, vtotal(bt) + 1);
 330
 331         /* For progressive video vlength2 must be set to all 0 and vdly2 must
 332          * be set to all 1.
 333          */
 334         ths8200_write(sd, THS8200_DTG2_VLENGTH2_LSB, 0x00);
 335         ths8200_write(sd, THS8200_DTG2_VLENGTH2_MSB_VDLY2_MSB, 0x07);
 336         ths8200_write(sd, THS8200_DTG2_VDLY2_LSB, 0xff);
 337
 338         /* Internal delay factors to synchronize the sync pulses and the data */
 339         /* Experimental values delays (hor 0, ver 0) */
 340         ths8200_write(sd, THS8200_DTG2_HS_IN_DLY_MSB, 0);
 341         ths8200_write(sd, THS8200_DTG2_HS_IN_DLY_LSB, 0);
 342         ths8200_write(sd, THS8200_DTG2_VS_IN_DLY_MSB, 0);
 343         ths8200_write(sd, THS8200_DTG2_VS_IN_DLY_LSB, 0);
 344
 345         /* Polarity of received and transmitted sync signals */
 346         if (bt->polarities & V4L2_DV_HSYNC_POS_POL) {
 347                 polarity |= 0x01; /* HS_IN */
 348                 polarity |= 0x08; /* HS_OUT */
 349         }
 350         if (bt->polarities & V4L2_DV_VSYNC_POS_POL) {
 351                 polarity |= 0x02; /* VS_IN */
 352                 polarity |= 0x10; /* VS_OUT */
 353         }
 354
 355         /* RGB mode, no embedded timings */
 356         /* Timing of video input bus is derived from HS, VS, and FID dedicated
 357          * inputs
 358          */
 359         ths8200_write(sd, THS8200_DTG2_CNTL, 0x44 | polarity);
 360
 361         /* leave reset */
 362         ths8200_s_stream(sd, true);
 363
 364         v4l2_dbg(1, debug, sd, "%s: frame %dx%d, polarity %d\n"
 365                  "horizontal: front porch %d, back porch %d, sync %d\n"
 366                  "vertical: sync %d\n", __func__, htotal(bt), vtotal(bt),
 367                  polarity, bt->hfrontporch, bt->hbackporch,
 368                  bt->hsync, bt->vsync);
 369 }
 370
 371 static int ths8200_s_dv_timings(struct v4l2_subdev *sd,
 372                                 struct v4l2_dv_timings *timings)
 373 {
 374         struct ths8200_state *state = to_state(sd);
 375
 376         v4l2_dbg(1, debug, sd, "%s:\n", __func__);
 377
 378         if (!v4l2_valid_dv_timings(timings, &ths8200_timings_cap,
 379                                 NULL, NULL))
 380                 return -EINVAL;
 381
 382         if (!v4l2_find_dv_timings_cap(timings, &ths8200_timings_cap, 10,
 383                                 NULL, NULL)) {
 384                 v4l2_dbg(1, debug, sd, "Unsupported format\n");
 385                 return -EINVAL;
 386         }
 387
 388         timings->bt.flags &= ~V4L2_DV_FL_REDUCED_FPS;
 389
 390         /* save timings */
 391         state->dv_timings = *timings;
 392
 393         ths8200_setup(sd, &timings->bt);
 394
 395         return 0;
 396 }
 397
 398 static int ths8200_g_dv_timings(struct v4l2_subdev *sd,
 399                                 struct v4l2_dv_timings *timings)
 400 {
 401         struct ths8200_state *state = to_state(sd);
 402
 403         v4l2_dbg(1, debug, sd, "%s:\n", __func__);
 404
 405         *timings = state->dv_timings;
 406
 407         return 0;
 408 }
 409
 410 static int ths8200_enum_dv_timings(struct v4l2_subdev *sd,
 411                                    struct v4l2_enum_dv_timings *timings)
 412 {
 413         if (timings->pad != 0)
 414                 return -EINVAL;
 415
 416         return v4l2_enum_dv_timings_cap(timings, &ths8200_timings_cap,
 417                         NULL, NULL);
 418 }
 419
 420 static int ths8200_dv_timings_cap(struct v4l2_subdev *sd,
 421                                   struct v4l2_dv_timings_cap *cap)
 422 {
 423         if (cap->pad != 0)
 424                 return -EINVAL;
 425
 426         *cap = ths8200_timings_cap;
 427         return 0;
 428 }
 429
 430 /* Specific video subsystem operation handlers */
 431 static const struct v4l2_subdev_video_ops ths8200_video_ops = {
 432         .s_stream = ths8200_s_stream,
 433         .s_dv_timings = ths8200_s_dv_timings,
 434         .g_dv_timings = ths8200_g_dv_timings,
 435 };
 436
 437 static const struct v4l2_subdev_pad_ops ths8200_pad_ops = {
 438         .enum_dv_timings = ths8200_enum_dv_timings,
 439         .dv_timings_cap = ths8200_dv_timings_cap,
 440 };
 441
 442 /* V4L2 top level operation handlers */
 443 static const struct v4l2_subdev_ops ths8200_ops = {
 444         .core  = &ths8200_core_ops,
 445         .video = &ths8200_video_ops,
 446         .pad = &ths8200_pad_ops,
 447 };
 448
 449 static int ths8200_probe(struct i2c_client *client,
 450                          const struct i2c_device_id *id)
 451 {
 452         struct ths8200_state *state;
 453         struct v4l2_subdev *sd;
 454         int error;
 455
 456         /* Check if the adapter supports the needed features */
 457         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 458                 return -EIO;
 459
 460         state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL);
 461         if (!state)
 462                 return -ENOMEM;
 463
 464         sd = &state->sd;
 465         v4l2_i2c_subdev_init(sd, client, &ths8200_ops);
 466
 467         state->chip_version = ths8200_read(sd, THS8200_VERSION);
 468         v4l2_dbg(1, debug, sd, "chip version 0x%x\n", state->chip_version);
 469
 470         ths8200_core_init(sd);
 471
 472         error = v4l2_async_register_subdev(&state->sd);
 473         if (error)
 474                 return error;
 475
 476         v4l2_info(sd, "%s found @ 0x%x (%s)\n", client->name,
 477                   client->addr << 1, client->adapter->name);
 478
 479         return 0;
 480 }
 481
 482 static int ths8200_remove(struct i2c_client *client)
 483 {
 484         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 485         struct ths8200_state *decoder = to_state(sd);
 486
 487         v4l2_dbg(1, debug, sd, "%s removed @ 0x%x (%s)\n", client->name,
 488                  client->addr << 1, client->adapter->name);
 489
 490         ths8200_s_power(sd, false);
 491         v4l2_async_unregister_subdev(&decoder->sd);
 492         v4l2_device_unregister_subdev(sd);
 493
 494         return 0;
 495 }
 496
 497 static struct i2c_device_id ths8200_id[] = {
 498         { "ths8200", 0 },
 499         {},
 500 };
 501 MODULE_DEVICE_TABLE(i2c, ths8200_id);
 502
 503 #if IS_ENABLED(CONFIG_OF)
 504 static const struct of_device_id ths8200_of_match[] = {
 505         { .compatible = "ti,ths8200", },
 506         { /* sentinel */ },
 507 };
 508 MODULE_DEVICE_TABLE(of, ths8200_of_match);
 509 #endif
 510
 511 static struct i2c_driver ths8200_driver = {
 512         .driver = {
 513                 .owner = THIS_MODULE,
 514                 .name = "ths8200",
 515                 .of_match_table = of_match_ptr(ths8200_of_match),
 516         },
 517         .probe = ths8200_probe,
 518         .remove = ths8200_remove,
 519         .id_table = ths8200_id,
 520 };
 521
 522 module_i2c_driver(ths8200_driver);