1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Driver for the Texas Instruments DS90UB913 video serializer 4 * 5 * Based on a driver from Luca Ceresoli <luca@lucaceresoli.net> 6 * 7 * Copyright (c) 2019 Luca Ceresoli <luca@lucaceresoli.net> 8 * Copyright (c) 2023 Tomi Valkeinen <tomi.valkeinen@ideasonboard.com> 9 */ 10 11 #include <linux/clk-provider.h> 12 #include <linux/clk.h> 13 #include <linux/delay.h> 14 #include <linux/fwnode.h> 15 #include <linux/gpio/driver.h> 16 #include <linux/i2c-atr.h> 17 #include <linux/i2c.h> 18 #include <linux/kernel.h> 19 #include <linux/module.h> 20 #include <linux/property.h> 21 #include <linux/regmap.h> 22 23 #include <media/i2c/ds90ub9xx.h> 24 #include <media/v4l2-fwnode.h> 25 #include <media/v4l2-mediabus.h> 26 #include <media/v4l2-subdev.h> 27 28 #define UB913_PAD_SINK 0 29 #define UB913_PAD_SOURCE 1 30 31 /* 32 * UB913 has 4 gpios, but gpios 3 and 4 are reserved for external oscillator 33 * mode. Thus we only support 2 gpios for now. 34 */ 35 #define UB913_NUM_GPIOS 2 36 37 #define UB913_REG_RESET_CTL 0x01 38 #define UB913_REG_RESET_CTL_DIGITAL_RESET_1 BIT(1) 39 #define UB913_REG_RESET_CTL_DIGITAL_RESET_0 BIT(0) 40 41 #define UB913_REG_GENERAL_CFG 0x03 42 #define UB913_REG_GENERAL_CFG_CRC_ERR_RESET BIT(5) 43 #define UB913_REG_GENERAL_CFG_PCLK_RISING BIT(0) 44 45 #define UB913_REG_MODE_SEL 0x05 46 #define UB913_REG_MODE_SEL_MODE_OVERRIDE BIT(5) 47 #define UB913_REG_MODE_SEL_MODE_UP_TO_DATE BIT(4) 48 #define UB913_REG_MODE_SEL_MODE_MASK GENMASK(3, 0) 49 50 #define UB913_REG_CRC_ERRORS_LSB 0x0a 51 #define UB913_REG_CRC_ERRORS_MSB 0x0b 52 53 #define UB913_REG_GENERAL_STATUS 0x0c 54 55 #define UB913_REG_GPIO_CFG(n) (0x0d + (n)) 56 #define UB913_REG_GPIO_CFG_ENABLE(n) BIT(0 + (n) * 4) 57 #define UB913_REG_GPIO_CFG_DIR_INPUT(n) BIT(1 + (n) * 4) 58 #define UB913_REG_GPIO_CFG_REMOTE_EN(n) BIT(2 + (n) * 4) 59 #define UB913_REG_GPIO_CFG_OUT_VAL(n) BIT(3 + (n) * 4) 60 #define UB913_REG_GPIO_CFG_MASK(n) (0xf << ((n) * 4)) 61 62 #define UB913_REG_SCL_HIGH_TIME 0x11 63 #define UB913_REG_SCL_LOW_TIME 0x12 64 65 #define UB913_REG_PLL_OVR 0x35 66 67 struct ub913_data { 68 struct i2c_client *client; 69 struct regmap *regmap; 70 struct clk *clkin; 71 72 struct gpio_chip gpio_chip; 73 74 struct v4l2_subdev sd; 75 struct media_pad pads[2]; 76 77 struct v4l2_async_notifier notifier; 78 79 struct v4l2_subdev *source_sd; 80 u16 source_sd_pad; 81 82 u64 enabled_source_streams; 83 84 struct clk_hw *clkout_clk_hw; 85 86 struct ds90ub9xx_platform_data *plat_data; 87 88 bool pclk_polarity_rising; 89 }; 90 91 static inline struct ub913_data *sd_to_ub913(struct v4l2_subdev *sd) 92 { 93 return container_of(sd, struct ub913_data, sd); 94 } 95 96 struct ub913_format_info { 97 u32 incode; 98 u32 outcode; 99 }; 100 101 static const struct ub913_format_info ub913_formats[] = { 102 /* Only RAW10 with 8-bit payload is supported at the moment */ 103 { .incode = MEDIA_BUS_FMT_YUYV8_2X8, .outcode = MEDIA_BUS_FMT_YUYV8_1X16 }, 104 { .incode = MEDIA_BUS_FMT_UYVY8_2X8, .outcode = MEDIA_BUS_FMT_UYVY8_1X16 }, 105 { .incode = MEDIA_BUS_FMT_VYUY8_2X8, .outcode = MEDIA_BUS_FMT_VYUY8_1X16 }, 106 { .incode = MEDIA_BUS_FMT_YVYU8_2X8, .outcode = MEDIA_BUS_FMT_YVYU8_1X16 }, 107 }; 108 109 static const struct ub913_format_info *ub913_find_format(u32 incode) 110 { 111 unsigned int i; 112 113 for (i = 0; i < ARRAY_SIZE(ub913_formats); i++) { 114 if (ub913_formats[i].incode == incode) 115 return &ub913_formats[i]; 116 } 117 118 return NULL; 119 } 120 121 static int ub913_read(const struct ub913_data *priv, u8 reg, u8 *val) 122 { 123 unsigned int v; 124 int ret; 125 126 ret = regmap_read(priv->regmap, reg, &v); 127 if (ret < 0) { 128 dev_err(&priv->client->dev, 129 "Cannot read register 0x%02x: %d!\n", reg, ret); 130 return ret; 131 } 132 133 *val = v; 134 return 0; 135 } 136 137 static int ub913_write(const struct ub913_data *priv, u8 reg, u8 val) 138 { 139 int ret; 140 141 ret = regmap_write(priv->regmap, reg, val); 142 if (ret < 0) 143 dev_err(&priv->client->dev, 144 "Cannot write register 0x%02x: %d!\n", reg, ret); 145 146 return ret; 147 } 148 149 /* 150 * GPIO chip 151 */ 152 static int ub913_gpio_get_direction(struct gpio_chip *gc, unsigned int offset) 153 { 154 return GPIO_LINE_DIRECTION_OUT; 155 } 156 157 static int ub913_gpio_direction_out(struct gpio_chip *gc, unsigned int offset, 158 int value) 159 { 160 struct ub913_data *priv = gpiochip_get_data(gc); 161 unsigned int reg_idx = offset / 2; 162 unsigned int field_idx = offset % 2; 163 164 return regmap_update_bits(priv->regmap, UB913_REG_GPIO_CFG(reg_idx), 165 UB913_REG_GPIO_CFG_MASK(field_idx), 166 UB913_REG_GPIO_CFG_ENABLE(field_idx) | 167 (value ? UB913_REG_GPIO_CFG_OUT_VAL(field_idx) : 168 0)); 169 } 170 171 static void ub913_gpio_set(struct gpio_chip *gc, unsigned int offset, int value) 172 { 173 ub913_gpio_direction_out(gc, offset, value); 174 } 175 176 static int ub913_gpio_of_xlate(struct gpio_chip *gc, 177 const struct of_phandle_args *gpiospec, 178 u32 *flags) 179 { 180 if (flags) 181 *flags = gpiospec->args[1]; 182 183 return gpiospec->args[0]; 184 } 185 186 static int ub913_gpiochip_probe(struct ub913_data *priv) 187 { 188 struct device *dev = &priv->client->dev; 189 struct gpio_chip *gc = &priv->gpio_chip; 190 int ret; 191 192 /* Initialize GPIOs 0 and 1 to local control, tri-state */ 193 ub913_write(priv, UB913_REG_GPIO_CFG(0), 0); 194 195 gc->label = dev_name(dev); 196 gc->parent = dev; 197 gc->owner = THIS_MODULE; 198 gc->base = -1; 199 gc->can_sleep = true; 200 gc->ngpio = UB913_NUM_GPIOS; 201 gc->get_direction = ub913_gpio_get_direction; 202 gc->direction_output = ub913_gpio_direction_out; 203 gc->set = ub913_gpio_set; 204 gc->of_xlate = ub913_gpio_of_xlate; 205 gc->of_gpio_n_cells = 2; 206 207 ret = gpiochip_add_data(gc, priv); 208 if (ret) { 209 dev_err(dev, "Failed to add GPIOs: %d\n", ret); 210 return ret; 211 } 212 213 return 0; 214 } 215 216 static void ub913_gpiochip_remove(struct ub913_data *priv) 217 { 218 gpiochip_remove(&priv->gpio_chip); 219 } 220 221 static const struct regmap_config ub913_regmap_config = { 222 .name = "ds90ub913", 223 .reg_bits = 8, 224 .val_bits = 8, 225 .reg_format_endian = REGMAP_ENDIAN_DEFAULT, 226 .val_format_endian = REGMAP_ENDIAN_DEFAULT, 227 }; 228 229 /* 230 * V4L2 231 */ 232 233 static int ub913_enable_streams(struct v4l2_subdev *sd, 234 struct v4l2_subdev_state *state, u32 pad, 235 u64 streams_mask) 236 { 237 struct ub913_data *priv = sd_to_ub913(sd); 238 u64 sink_streams; 239 int ret; 240 241 sink_streams = v4l2_subdev_state_xlate_streams(state, UB913_PAD_SOURCE, 242 UB913_PAD_SINK, 243 &streams_mask); 244 245 ret = v4l2_subdev_enable_streams(priv->source_sd, priv->source_sd_pad, 246 sink_streams); 247 if (ret) 248 return ret; 249 250 priv->enabled_source_streams |= streams_mask; 251 252 return 0; 253 } 254 255 static int ub913_disable_streams(struct v4l2_subdev *sd, 256 struct v4l2_subdev_state *state, u32 pad, 257 u64 streams_mask) 258 { 259 struct ub913_data *priv = sd_to_ub913(sd); 260 u64 sink_streams; 261 int ret; 262 263 sink_streams = v4l2_subdev_state_xlate_streams(state, UB913_PAD_SOURCE, 264 UB913_PAD_SINK, 265 &streams_mask); 266 267 ret = v4l2_subdev_disable_streams(priv->source_sd, priv->source_sd_pad, 268 sink_streams); 269 if (ret) 270 return ret; 271 272 priv->enabled_source_streams &= ~streams_mask; 273 274 return 0; 275 } 276 277 static int _ub913_set_routing(struct v4l2_subdev *sd, 278 struct v4l2_subdev_state *state, 279 struct v4l2_subdev_krouting *routing) 280 { 281 static const struct v4l2_mbus_framefmt in_format = { 282 .width = 640, 283 .height = 480, 284 .code = MEDIA_BUS_FMT_UYVY8_2X8, 285 .field = V4L2_FIELD_NONE, 286 .colorspace = V4L2_COLORSPACE_SRGB, 287 .ycbcr_enc = V4L2_YCBCR_ENC_601, 288 .quantization = V4L2_QUANTIZATION_LIM_RANGE, 289 .xfer_func = V4L2_XFER_FUNC_SRGB, 290 }; 291 static const struct v4l2_mbus_framefmt out_format = { 292 .width = 640, 293 .height = 480, 294 .code = MEDIA_BUS_FMT_UYVY8_1X16, 295 .field = V4L2_FIELD_NONE, 296 .colorspace = V4L2_COLORSPACE_SRGB, 297 .ycbcr_enc = V4L2_YCBCR_ENC_601, 298 .quantization = V4L2_QUANTIZATION_LIM_RANGE, 299 .xfer_func = V4L2_XFER_FUNC_SRGB, 300 }; 301 struct v4l2_subdev_stream_configs *stream_configs; 302 unsigned int i; 303 int ret; 304 305 /* 306 * Note: we can only support up to V4L2_FRAME_DESC_ENTRY_MAX, until 307 * frame desc is made dynamically allocated. 308 */ 309 310 if (routing->num_routes > V4L2_FRAME_DESC_ENTRY_MAX) 311 return -EINVAL; 312 313 ret = v4l2_subdev_routing_validate(sd, routing, 314 V4L2_SUBDEV_ROUTING_ONLY_1_TO_1); 315 if (ret) 316 return ret; 317 318 ret = v4l2_subdev_set_routing(sd, state, routing); 319 if (ret) 320 return ret; 321 322 stream_configs = &state->stream_configs; 323 324 for (i = 0; i < stream_configs->num_configs; i++) { 325 if (stream_configs->configs[i].pad == UB913_PAD_SINK) 326 stream_configs->configs[i].fmt = in_format; 327 else 328 stream_configs->configs[i].fmt = out_format; 329 } 330 331 return 0; 332 } 333 334 static int ub913_set_routing(struct v4l2_subdev *sd, 335 struct v4l2_subdev_state *state, 336 enum v4l2_subdev_format_whence which, 337 struct v4l2_subdev_krouting *routing) 338 { 339 struct ub913_data *priv = sd_to_ub913(sd); 340 341 if (which == V4L2_SUBDEV_FORMAT_ACTIVE && priv->enabled_source_streams) 342 return -EBUSY; 343 344 return _ub913_set_routing(sd, state, routing); 345 } 346 347 static int ub913_get_frame_desc(struct v4l2_subdev *sd, unsigned int pad, 348 struct v4l2_mbus_frame_desc *fd) 349 { 350 struct ub913_data *priv = sd_to_ub913(sd); 351 const struct v4l2_subdev_krouting *routing; 352 struct v4l2_mbus_frame_desc source_fd; 353 struct v4l2_subdev_route *route; 354 struct v4l2_subdev_state *state; 355 int ret; 356 357 if (pad != UB913_PAD_SOURCE) 358 return -EINVAL; 359 360 ret = v4l2_subdev_call(priv->source_sd, pad, get_frame_desc, 361 priv->source_sd_pad, &source_fd); 362 if (ret) 363 return ret; 364 365 memset(fd, 0, sizeof(*fd)); 366 367 fd->type = V4L2_MBUS_FRAME_DESC_TYPE_PARALLEL; 368 369 state = v4l2_subdev_lock_and_get_active_state(sd); 370 371 routing = &state->routing; 372 373 for_each_active_route(routing, route) { 374 unsigned int i; 375 376 if (route->source_pad != pad) 377 continue; 378 379 for (i = 0; i < source_fd.num_entries; i++) { 380 if (source_fd.entry[i].stream == route->sink_stream) 381 break; 382 } 383 384 if (i == source_fd.num_entries) { 385 dev_err(&priv->client->dev, 386 "Failed to find stream from source frame desc\n"); 387 ret = -EPIPE; 388 goto out_unlock; 389 } 390 391 fd->entry[fd->num_entries].stream = route->source_stream; 392 fd->entry[fd->num_entries].flags = source_fd.entry[i].flags; 393 fd->entry[fd->num_entries].length = source_fd.entry[i].length; 394 fd->entry[fd->num_entries].pixelcode = 395 source_fd.entry[i].pixelcode; 396 397 fd->num_entries++; 398 } 399 400 out_unlock: 401 v4l2_subdev_unlock_state(state); 402 403 return ret; 404 } 405 406 static int ub913_set_fmt(struct v4l2_subdev *sd, 407 struct v4l2_subdev_state *state, 408 struct v4l2_subdev_format *format) 409 { 410 struct ub913_data *priv = sd_to_ub913(sd); 411 struct v4l2_mbus_framefmt *fmt; 412 const struct ub913_format_info *finfo; 413 414 if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE && 415 priv->enabled_source_streams) 416 return -EBUSY; 417 418 /* Source format is fully defined by the sink format, so not settable */ 419 if (format->pad == UB913_PAD_SOURCE) 420 return v4l2_subdev_get_fmt(sd, state, format); 421 422 finfo = ub913_find_format(format->format.code); 423 if (!finfo) { 424 finfo = &ub913_formats[0]; 425 format->format.code = finfo->incode; 426 } 427 428 /* Set sink format */ 429 fmt = v4l2_subdev_state_get_stream_format(state, format->pad, 430 format->stream); 431 if (!fmt) 432 return -EINVAL; 433 434 *fmt = format->format; 435 436 /* Propagate to source format, and adjust the mbus code */ 437 fmt = v4l2_subdev_state_get_opposite_stream_format(state, format->pad, 438 format->stream); 439 if (!fmt) 440 return -EINVAL; 441 442 format->format.code = finfo->outcode; 443 444 *fmt = format->format; 445 446 return 0; 447 } 448 449 static int ub913_init_cfg(struct v4l2_subdev *sd, 450 struct v4l2_subdev_state *state) 451 { 452 struct v4l2_subdev_route routes[] = { 453 { 454 .sink_pad = UB913_PAD_SINK, 455 .sink_stream = 0, 456 .source_pad = UB913_PAD_SOURCE, 457 .source_stream = 0, 458 .flags = V4L2_SUBDEV_ROUTE_FL_ACTIVE, 459 }, 460 }; 461 462 struct v4l2_subdev_krouting routing = { 463 .num_routes = ARRAY_SIZE(routes), 464 .routes = routes, 465 }; 466 467 return _ub913_set_routing(sd, state, &routing); 468 } 469 470 static int ub913_log_status(struct v4l2_subdev *sd) 471 { 472 struct ub913_data *priv = sd_to_ub913(sd); 473 struct device *dev = &priv->client->dev; 474 u8 v = 0, v1 = 0, v2 = 0; 475 476 ub913_read(priv, UB913_REG_MODE_SEL, &v); 477 dev_info(dev, "MODE_SEL %#02x\n", v); 478 479 ub913_read(priv, UB913_REG_CRC_ERRORS_LSB, &v1); 480 ub913_read(priv, UB913_REG_CRC_ERRORS_MSB, &v2); 481 dev_info(dev, "CRC errors %u\n", v1 | (v2 << 8)); 482 483 /* clear CRC errors */ 484 ub913_read(priv, UB913_REG_GENERAL_CFG, &v); 485 ub913_write(priv, UB913_REG_GENERAL_CFG, 486 v | UB913_REG_GENERAL_CFG_CRC_ERR_RESET); 487 ub913_write(priv, UB913_REG_GENERAL_CFG, v); 488 489 ub913_read(priv, UB913_REG_GENERAL_STATUS, &v); 490 dev_info(dev, "GENERAL_STATUS %#02x\n", v); 491 492 ub913_read(priv, UB913_REG_PLL_OVR, &v); 493 dev_info(dev, "PLL_OVR %#02x\n", v); 494 495 return 0; 496 } 497 498 static const struct v4l2_subdev_core_ops ub913_subdev_core_ops = { 499 .log_status = ub913_log_status, 500 }; 501 502 static const struct v4l2_subdev_pad_ops ub913_pad_ops = { 503 .enable_streams = ub913_enable_streams, 504 .disable_streams = ub913_disable_streams, 505 .set_routing = ub913_set_routing, 506 .get_frame_desc = ub913_get_frame_desc, 507 .get_fmt = v4l2_subdev_get_fmt, 508 .set_fmt = ub913_set_fmt, 509 .init_cfg = ub913_init_cfg, 510 }; 511 512 static const struct v4l2_subdev_ops ub913_subdev_ops = { 513 .core = &ub913_subdev_core_ops, 514 .pad = &ub913_pad_ops, 515 }; 516 517 static const struct media_entity_operations ub913_entity_ops = { 518 .link_validate = v4l2_subdev_link_validate, 519 }; 520 521 static int ub913_notify_bound(struct v4l2_async_notifier *notifier, 522 struct v4l2_subdev *source_subdev, 523 struct v4l2_async_connection *asd) 524 { 525 struct ub913_data *priv = sd_to_ub913(notifier->sd); 526 struct device *dev = &priv->client->dev; 527 int ret; 528 529 ret = media_entity_get_fwnode_pad(&source_subdev->entity, 530 source_subdev->fwnode, 531 MEDIA_PAD_FL_SOURCE); 532 if (ret < 0) { 533 dev_err(dev, "Failed to find pad for %s\n", 534 source_subdev->name); 535 return ret; 536 } 537 538 priv->source_sd = source_subdev; 539 priv->source_sd_pad = ret; 540 541 ret = media_create_pad_link(&source_subdev->entity, priv->source_sd_pad, 542 &priv->sd.entity, UB913_PAD_SINK, 543 MEDIA_LNK_FL_ENABLED | 544 MEDIA_LNK_FL_IMMUTABLE); 545 if (ret) { 546 dev_err(dev, "Unable to link %s:%u -> %s:0\n", 547 source_subdev->name, priv->source_sd_pad, 548 priv->sd.name); 549 return ret; 550 } 551 552 return 0; 553 } 554 555 static const struct v4l2_async_notifier_operations ub913_notify_ops = { 556 .bound = ub913_notify_bound, 557 }; 558 559 static int ub913_v4l2_notifier_register(struct ub913_data *priv) 560 { 561 struct device *dev = &priv->client->dev; 562 struct v4l2_async_connection *asd; 563 struct fwnode_handle *ep_fwnode; 564 int ret; 565 566 ep_fwnode = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev), 567 UB913_PAD_SINK, 0, 0); 568 if (!ep_fwnode) { 569 dev_err(dev, "No graph endpoint\n"); 570 return -ENODEV; 571 } 572 573 v4l2_async_subdev_nf_init(&priv->notifier, &priv->sd); 574 575 asd = v4l2_async_nf_add_fwnode_remote(&priv->notifier, ep_fwnode, 576 struct v4l2_async_connection); 577 578 fwnode_handle_put(ep_fwnode); 579 580 if (IS_ERR(asd)) { 581 dev_err(dev, "Failed to add subdev: %ld", PTR_ERR(asd)); 582 v4l2_async_nf_cleanup(&priv->notifier); 583 return PTR_ERR(asd); 584 } 585 586 priv->notifier.ops = &ub913_notify_ops; 587 588 ret = v4l2_async_nf_register(&priv->notifier); 589 if (ret) { 590 dev_err(dev, "Failed to register subdev_notifier"); 591 v4l2_async_nf_cleanup(&priv->notifier); 592 return ret; 593 } 594 595 return 0; 596 } 597 598 static void ub913_v4l2_nf_unregister(struct ub913_data *priv) 599 { 600 v4l2_async_nf_unregister(&priv->notifier); 601 v4l2_async_nf_cleanup(&priv->notifier); 602 } 603 604 static int ub913_register_clkout(struct ub913_data *priv) 605 { 606 struct device *dev = &priv->client->dev; 607 const char *name; 608 int ret; 609 610 name = kasprintf(GFP_KERNEL, "ds90ub913.%s.clk_out", dev_name(dev)); 611 if (!name) 612 return -ENOMEM; 613 614 priv->clkout_clk_hw = devm_clk_hw_register_fixed_factor(dev, name, 615 __clk_get_name(priv->clkin), 0, 1, 2); 616 617 kfree(name); 618 619 if (IS_ERR(priv->clkout_clk_hw)) 620 return dev_err_probe(dev, PTR_ERR(priv->clkout_clk_hw), 621 "Cannot register clkout hw\n"); 622 623 ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get, 624 priv->clkout_clk_hw); 625 if (ret) 626 return dev_err_probe(dev, ret, 627 "Cannot add OF clock provider\n"); 628 629 return 0; 630 } 631 632 static int ub913_i2c_master_init(struct ub913_data *priv) 633 { 634 /* i2c fast mode */ 635 u32 scl_high = 600 + 300; /* high period + rise time, ns */ 636 u32 scl_low = 1300 + 300; /* low period + fall time, ns */ 637 unsigned long ref; 638 int ret; 639 640 ref = clk_get_rate(priv->clkin) / 2; 641 642 scl_high = div64_u64((u64)scl_high * ref, 1000000000); 643 scl_low = div64_u64((u64)scl_low * ref, 1000000000); 644 645 ret = ub913_write(priv, UB913_REG_SCL_HIGH_TIME, scl_high); 646 if (ret) 647 return ret; 648 649 ret = ub913_write(priv, UB913_REG_SCL_LOW_TIME, scl_low); 650 if (ret) 651 return ret; 652 653 return 0; 654 } 655 656 static int ub913_add_i2c_adapter(struct ub913_data *priv) 657 { 658 struct device *dev = &priv->client->dev; 659 struct fwnode_handle *i2c_handle; 660 int ret; 661 662 i2c_handle = device_get_named_child_node(dev, "i2c"); 663 if (!i2c_handle) 664 return 0; 665 666 ret = i2c_atr_add_adapter(priv->plat_data->atr, priv->plat_data->port, 667 dev, i2c_handle); 668 669 fwnode_handle_put(i2c_handle); 670 671 if (ret) 672 return ret; 673 674 return 0; 675 } 676 677 static int ub913_parse_dt(struct ub913_data *priv) 678 { 679 struct device *dev = &priv->client->dev; 680 struct v4l2_fwnode_endpoint vep = { 681 .bus_type = V4L2_MBUS_PARALLEL, 682 }; 683 struct fwnode_handle *ep_fwnode; 684 int ret; 685 686 ep_fwnode = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev), 687 UB913_PAD_SINK, 0, 0); 688 if (!ep_fwnode) 689 return dev_err_probe(dev, -ENOENT, "No sink endpoint\n"); 690 691 ret = v4l2_fwnode_endpoint_parse(ep_fwnode, &vep); 692 693 fwnode_handle_put(ep_fwnode); 694 695 if (ret) 696 return dev_err_probe(dev, ret, 697 "failed to parse sink endpoint data\n"); 698 699 if (vep.bus.parallel.flags & V4L2_MBUS_PCLK_SAMPLE_RISING) 700 priv->pclk_polarity_rising = true; 701 else if (vep.bus.parallel.flags & V4L2_MBUS_PCLK_SAMPLE_FALLING) 702 priv->pclk_polarity_rising = false; 703 else 704 return dev_err_probe(dev, -EINVAL, 705 "bad value for 'pclk-sample'\n"); 706 707 return 0; 708 } 709 710 static int ub913_hw_init(struct ub913_data *priv) 711 { 712 struct device *dev = &priv->client->dev; 713 bool mode_override; 714 u8 mode; 715 int ret; 716 u8 v; 717 718 ret = ub913_read(priv, UB913_REG_MODE_SEL, &v); 719 if (ret) 720 return ret; 721 722 if (!(v & UB913_REG_MODE_SEL_MODE_UP_TO_DATE)) 723 return dev_err_probe(dev, -ENODEV, 724 "Mode value not stabilized\n"); 725 726 mode_override = v & UB913_REG_MODE_SEL_MODE_OVERRIDE; 727 mode = v & UB913_REG_MODE_SEL_MODE_MASK; 728 729 dev_dbg(dev, "mode from %s: %#x\n", 730 mode_override ? "reg" : "deserializer", mode); 731 732 ret = ub913_i2c_master_init(priv); 733 if (ret) 734 return dev_err_probe(dev, ret, "i2c master init failed\n"); 735 736 ub913_read(priv, UB913_REG_GENERAL_CFG, &v); 737 v &= ~UB913_REG_GENERAL_CFG_PCLK_RISING; 738 v |= priv->pclk_polarity_rising ? UB913_REG_GENERAL_CFG_PCLK_RISING : 0; 739 ub913_write(priv, UB913_REG_GENERAL_CFG, v); 740 741 return 0; 742 } 743 744 static int ub913_subdev_init(struct ub913_data *priv) 745 { 746 struct device *dev = &priv->client->dev; 747 int ret; 748 749 v4l2_i2c_subdev_init(&priv->sd, priv->client, &ub913_subdev_ops); 750 priv->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE | V4L2_SUBDEV_FL_STREAMS; 751 priv->sd.entity.function = MEDIA_ENT_F_VID_IF_BRIDGE; 752 priv->sd.entity.ops = &ub913_entity_ops; 753 754 priv->pads[0].flags = MEDIA_PAD_FL_SINK; 755 priv->pads[1].flags = MEDIA_PAD_FL_SOURCE; 756 757 ret = media_entity_pads_init(&priv->sd.entity, 2, priv->pads); 758 if (ret) 759 return dev_err_probe(dev, ret, "Failed to init pads\n"); 760 761 ret = v4l2_subdev_init_finalize(&priv->sd); 762 if (ret) 763 goto err_entity_cleanup; 764 765 ret = ub913_v4l2_notifier_register(priv); 766 if (ret) { 767 dev_err_probe(dev, ret, 768 "v4l2 subdev notifier register failed\n"); 769 goto err_subdev_cleanup; 770 } 771 772 ret = v4l2_async_register_subdev(&priv->sd); 773 if (ret) { 774 dev_err_probe(dev, ret, "v4l2_async_register_subdev error\n"); 775 goto err_unreg_notif; 776 } 777 778 return 0; 779 780 err_unreg_notif: 781 ub913_v4l2_nf_unregister(priv); 782 err_subdev_cleanup: 783 v4l2_subdev_cleanup(&priv->sd); 784 err_entity_cleanup: 785 media_entity_cleanup(&priv->sd.entity); 786 787 return ret; 788 } 789 790 static void ub913_subdev_uninit(struct ub913_data *priv) 791 { 792 v4l2_async_unregister_subdev(&priv->sd); 793 ub913_v4l2_nf_unregister(priv); 794 v4l2_subdev_cleanup(&priv->sd); 795 fwnode_handle_put(priv->sd.fwnode); 796 media_entity_cleanup(&priv->sd.entity); 797 } 798 799 static int ub913_probe(struct i2c_client *client) 800 { 801 struct device *dev = &client->dev; 802 struct ub913_data *priv; 803 int ret; 804 805 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); 806 if (!priv) 807 return -ENOMEM; 808 809 priv->client = client; 810 811 priv->plat_data = dev_get_platdata(&client->dev); 812 if (!priv->plat_data) 813 return dev_err_probe(dev, -ENODEV, "Platform data missing\n"); 814 815 priv->regmap = devm_regmap_init_i2c(client, &ub913_regmap_config); 816 if (IS_ERR(priv->regmap)) 817 return dev_err_probe(dev, PTR_ERR(priv->regmap), 818 "Failed to init regmap\n"); 819 820 /* 821 * ub913 can also work without ext clock, but that is not supported by 822 * the driver yet. 823 */ 824 priv->clkin = devm_clk_get(dev, "clkin"); 825 if (IS_ERR(priv->clkin)) 826 return dev_err_probe(dev, PTR_ERR(priv->clkin), 827 "Cannot get CLKIN\n"); 828 829 ret = ub913_parse_dt(priv); 830 if (ret) 831 return ret; 832 833 ret = ub913_hw_init(priv); 834 if (ret) 835 return ret; 836 837 ret = ub913_gpiochip_probe(priv); 838 if (ret) 839 return dev_err_probe(dev, ret, "Failed to init gpiochip\n"); 840 841 ret = ub913_register_clkout(priv); 842 if (ret) { 843 dev_err_probe(dev, ret, "Failed to register clkout\n"); 844 goto err_gpiochip_remove; 845 } 846 847 ret = ub913_subdev_init(priv); 848 if (ret) 849 goto err_gpiochip_remove; 850 851 ret = ub913_add_i2c_adapter(priv); 852 if (ret) { 853 dev_err_probe(dev, ret, "failed to add remote i2c adapter\n"); 854 goto err_subdev_uninit; 855 } 856 857 return 0; 858 859 err_subdev_uninit: 860 ub913_subdev_uninit(priv); 861 err_gpiochip_remove: 862 ub913_gpiochip_remove(priv); 863 864 return ret; 865 } 866 867 static void ub913_remove(struct i2c_client *client) 868 { 869 struct v4l2_subdev *sd = i2c_get_clientdata(client); 870 struct ub913_data *priv = sd_to_ub913(sd); 871 872 i2c_atr_del_adapter(priv->plat_data->atr, priv->plat_data->port); 873 874 ub913_subdev_uninit(priv); 875 876 ub913_gpiochip_remove(priv); 877 } 878 879 static const struct i2c_device_id ub913_id[] = { { "ds90ub913a-q1", 0 }, {} }; 880 MODULE_DEVICE_TABLE(i2c, ub913_id); 881 882 static const struct of_device_id ub913_dt_ids[] = { 883 { .compatible = "ti,ds90ub913a-q1" }, 884 {} 885 }; 886 MODULE_DEVICE_TABLE(of, ub913_dt_ids); 887 888 static struct i2c_driver ds90ub913_driver = { 889 .probe = ub913_probe, 890 .remove = ub913_remove, 891 .id_table = ub913_id, 892 .driver = { 893 .name = "ds90ub913a", 894 .of_match_table = ub913_dt_ids, 895 }, 896 }; 897 module_i2c_driver(ds90ub913_driver); 898 899 MODULE_LICENSE("GPL"); 900 MODULE_DESCRIPTION("Texas Instruments DS90UB913 FPD-Link III Serializer Driver"); 901 MODULE_AUTHOR("Luca Ceresoli <luca@lucaceresoli.net>"); 902 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>"); 903 MODULE_IMPORT_NS(I2C_ATR); 904