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 67struct 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 91static inline struct ub913_data *sd_to_ub913(struct v4l2_subdev *sd) 92{ 93 return container_of(sd, struct ub913_data, sd); 94} 95 96struct ub913_format_info { 97 u32 incode; 98 u32 outcode; 99}; 100 101static 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 109static 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 121static 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 137static 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 */ 152static int ub913_gpio_get_direction(struct gpio_chip *gc, unsigned int offset) 153{ 154 return GPIO_LINE_DIRECTION_OUT; 155} 156 157static 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 171static void ub913_gpio_set(struct gpio_chip *gc, unsigned int offset, int value) 172{ 173 ub913_gpio_direction_out(gc, offset, value); 174} 175 176static 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 186static 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 216static void ub913_gpiochip_remove(struct ub913_data *priv) 217{ 218 gpiochip_remove(&priv->gpio_chip); 219} 220 221static 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 233static 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 255static 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 277static 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 334static 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 347static 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 fd->type = V4L2_MBUS_FRAME_DESC_TYPE_PARALLEL; 366 367 state = v4l2_subdev_lock_and_get_active_state(sd); 368 369 routing = &state->routing; 370 371 for_each_active_route(routing, route) { 372 unsigned int i; 373 374 if (route->source_pad != pad) 375 continue; 376 377 for (i = 0; i < source_fd.num_entries; i++) { 378 if (source_fd.entry[i].stream == route->sink_stream) 379 break; 380 } 381 382 if (i == source_fd.num_entries) { 383 dev_err(&priv->client->dev, 384 "Failed to find stream from source frame desc\n"); 385 ret = -EPIPE; 386 goto out_unlock; 387 } 388 389 fd->entry[fd->num_entries].stream = route->source_stream; 390 fd->entry[fd->num_entries].flags = source_fd.entry[i].flags; 391 fd->entry[fd->num_entries].length = source_fd.entry[i].length; 392 fd->entry[fd->num_entries].pixelcode = 393 source_fd.entry[i].pixelcode; 394 395 fd->num_entries++; 396 } 397 398out_unlock: 399 v4l2_subdev_unlock_state(state); 400 401 return ret; 402} 403 404static int ub913_set_fmt(struct v4l2_subdev *sd, 405 struct v4l2_subdev_state *state, 406 struct v4l2_subdev_format *format) 407{ 408 struct ub913_data *priv = sd_to_ub913(sd); 409 struct v4l2_mbus_framefmt *fmt; 410 const struct ub913_format_info *finfo; 411 412 if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE && 413 priv->enabled_source_streams) 414 return -EBUSY; 415 416 /* Source format is fully defined by the sink format, so not settable */ 417 if (format->pad == UB913_PAD_SOURCE) 418 return v4l2_subdev_get_fmt(sd, state, format); 419 420 finfo = ub913_find_format(format->format.code); 421 if (!finfo) { 422 finfo = &ub913_formats[0]; 423 format->format.code = finfo->incode; 424 } 425 426 /* Set sink format */ 427 fmt = v4l2_subdev_state_get_format(state, format->pad, format->stream); 428 if (!fmt) 429 return -EINVAL; 430 431 *fmt = format->format; 432 433 /* Propagate to source format, and adjust the mbus code */ 434 fmt = v4l2_subdev_state_get_opposite_stream_format(state, format->pad, 435 format->stream); 436 if (!fmt) 437 return -EINVAL; 438 439 format->format.code = finfo->outcode; 440 441 *fmt = format->format; 442 443 return 0; 444} 445 446static int ub913_init_state(struct v4l2_subdev *sd, 447 struct v4l2_subdev_state *state) 448{ 449 struct v4l2_subdev_route routes[] = { 450 { 451 .sink_pad = UB913_PAD_SINK, 452 .sink_stream = 0, 453 .source_pad = UB913_PAD_SOURCE, 454 .source_stream = 0, 455 .flags = V4L2_SUBDEV_ROUTE_FL_ACTIVE, 456 }, 457 }; 458 459 struct v4l2_subdev_krouting routing = { 460 .num_routes = ARRAY_SIZE(routes), 461 .routes = routes, 462 }; 463 464 return _ub913_set_routing(sd, state, &routing); 465} 466 467static int ub913_log_status(struct v4l2_subdev *sd) 468{ 469 struct ub913_data *priv = sd_to_ub913(sd); 470 struct device *dev = &priv->client->dev; 471 u8 v = 0, v1 = 0, v2 = 0; 472 473 ub913_read(priv, UB913_REG_MODE_SEL, &v); 474 dev_info(dev, "MODE_SEL %#02x\n", v); 475 476 ub913_read(priv, UB913_REG_CRC_ERRORS_LSB, &v1); 477 ub913_read(priv, UB913_REG_CRC_ERRORS_MSB, &v2); 478 dev_info(dev, "CRC errors %u\n", v1 | (v2 << 8)); 479 480 /* clear CRC errors */ 481 ub913_read(priv, UB913_REG_GENERAL_CFG, &v); 482 ub913_write(priv, UB913_REG_GENERAL_CFG, 483 v | UB913_REG_GENERAL_CFG_CRC_ERR_RESET); 484 ub913_write(priv, UB913_REG_GENERAL_CFG, v); 485 486 ub913_read(priv, UB913_REG_GENERAL_STATUS, &v); 487 dev_info(dev, "GENERAL_STATUS %#02x\n", v); 488 489 ub913_read(priv, UB913_REG_PLL_OVR, &v); 490 dev_info(dev, "PLL_OVR %#02x\n", v); 491 492 return 0; 493} 494 495static const struct v4l2_subdev_core_ops ub913_subdev_core_ops = { 496 .log_status = ub913_log_status, 497}; 498 499static const struct v4l2_subdev_pad_ops ub913_pad_ops = { 500 .enable_streams = ub913_enable_streams, 501 .disable_streams = ub913_disable_streams, 502 .set_routing = ub913_set_routing, 503 .get_frame_desc = ub913_get_frame_desc, 504 .get_fmt = v4l2_subdev_get_fmt, 505 .set_fmt = ub913_set_fmt, 506}; 507 508static const struct v4l2_subdev_ops ub913_subdev_ops = { 509 .core = &ub913_subdev_core_ops, 510 .pad = &ub913_pad_ops, 511}; 512 513static const struct v4l2_subdev_internal_ops ub913_internal_ops = { 514 .init_state = ub913_init_state, 515}; 516 517static const struct media_entity_operations ub913_entity_ops = { 518 .link_validate = v4l2_subdev_link_validate, 519}; 520 521static 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 555static const struct v4l2_async_notifier_operations ub913_notify_ops = { 556 .bound = ub913_notify_bound, 557}; 558 559static 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 598static 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 604static 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 632static 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 656static 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 677static 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 710static 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 744static 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.internal_ops = &ub913_internal_ops; 751 priv->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE | V4L2_SUBDEV_FL_STREAMS; 752 priv->sd.entity.function = MEDIA_ENT_F_VID_IF_BRIDGE; 753 priv->sd.entity.ops = &ub913_entity_ops; 754 755 priv->pads[0].flags = MEDIA_PAD_FL_SINK; 756 priv->pads[1].flags = MEDIA_PAD_FL_SOURCE; 757 758 ret = media_entity_pads_init(&priv->sd.entity, 2, priv->pads); 759 if (ret) 760 return dev_err_probe(dev, ret, "Failed to init pads\n"); 761 762 ret = v4l2_subdev_init_finalize(&priv->sd); 763 if (ret) 764 goto err_entity_cleanup; 765 766 ret = ub913_v4l2_notifier_register(priv); 767 if (ret) { 768 dev_err_probe(dev, ret, 769 "v4l2 subdev notifier register failed\n"); 770 goto err_subdev_cleanup; 771 } 772 773 ret = v4l2_async_register_subdev(&priv->sd); 774 if (ret) { 775 dev_err_probe(dev, ret, "v4l2_async_register_subdev error\n"); 776 goto err_unreg_notif; 777 } 778 779 return 0; 780 781err_unreg_notif: 782 ub913_v4l2_nf_unregister(priv); 783err_subdev_cleanup: 784 v4l2_subdev_cleanup(&priv->sd); 785err_entity_cleanup: 786 media_entity_cleanup(&priv->sd.entity); 787 788 return ret; 789} 790 791static void ub913_subdev_uninit(struct ub913_data *priv) 792{ 793 v4l2_async_unregister_subdev(&priv->sd); 794 ub913_v4l2_nf_unregister(priv); 795 v4l2_subdev_cleanup(&priv->sd); 796 fwnode_handle_put(priv->sd.fwnode); 797 media_entity_cleanup(&priv->sd.entity); 798} 799 800static int ub913_probe(struct i2c_client *client) 801{ 802 struct device *dev = &client->dev; 803 struct ub913_data *priv; 804 int ret; 805 806 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); 807 if (!priv) 808 return -ENOMEM; 809 810 priv->client = client; 811 812 priv->plat_data = dev_get_platdata(&client->dev); 813 if (!priv->plat_data) 814 return dev_err_probe(dev, -ENODEV, "Platform data missing\n"); 815 816 priv->regmap = devm_regmap_init_i2c(client, &ub913_regmap_config); 817 if (IS_ERR(priv->regmap)) 818 return dev_err_probe(dev, PTR_ERR(priv->regmap), 819 "Failed to init regmap\n"); 820 821 /* 822 * ub913 can also work without ext clock, but that is not supported by 823 * the driver yet. 824 */ 825 priv->clkin = devm_clk_get(dev, "clkin"); 826 if (IS_ERR(priv->clkin)) 827 return dev_err_probe(dev, PTR_ERR(priv->clkin), 828 "Cannot get CLKIN\n"); 829 830 ret = ub913_parse_dt(priv); 831 if (ret) 832 return ret; 833 834 ret = ub913_hw_init(priv); 835 if (ret) 836 return ret; 837 838 ret = ub913_gpiochip_probe(priv); 839 if (ret) 840 return dev_err_probe(dev, ret, "Failed to init gpiochip\n"); 841 842 ret = ub913_register_clkout(priv); 843 if (ret) { 844 dev_err_probe(dev, ret, "Failed to register clkout\n"); 845 goto err_gpiochip_remove; 846 } 847 848 ret = ub913_subdev_init(priv); 849 if (ret) 850 goto err_gpiochip_remove; 851 852 ret = ub913_add_i2c_adapter(priv); 853 if (ret) { 854 dev_err_probe(dev, ret, "failed to add remote i2c adapter\n"); 855 goto err_subdev_uninit; 856 } 857 858 return 0; 859 860err_subdev_uninit: 861 ub913_subdev_uninit(priv); 862err_gpiochip_remove: 863 ub913_gpiochip_remove(priv); 864 865 return ret; 866} 867 868static void ub913_remove(struct i2c_client *client) 869{ 870 struct v4l2_subdev *sd = i2c_get_clientdata(client); 871 struct ub913_data *priv = sd_to_ub913(sd); 872 873 i2c_atr_del_adapter(priv->plat_data->atr, priv->plat_data->port); 874 875 ub913_subdev_uninit(priv); 876 877 ub913_gpiochip_remove(priv); 878} 879 880static const struct i2c_device_id ub913_id[] = { { "ds90ub913a-q1", 0 }, {} }; 881MODULE_DEVICE_TABLE(i2c, ub913_id); 882 883static const struct of_device_id ub913_dt_ids[] = { 884 { .compatible = "ti,ds90ub913a-q1" }, 885 {} 886}; 887MODULE_DEVICE_TABLE(of, ub913_dt_ids); 888 889static struct i2c_driver ds90ub913_driver = { 890 .probe = ub913_probe, 891 .remove = ub913_remove, 892 .id_table = ub913_id, 893 .driver = { 894 .name = "ds90ub913a", 895 .of_match_table = ub913_dt_ids, 896 }, 897}; 898module_i2c_driver(ds90ub913_driver); 899 900MODULE_LICENSE("GPL"); 901MODULE_DESCRIPTION("Texas Instruments DS90UB913 FPD-Link III Serializer Driver"); 902MODULE_AUTHOR("Luca Ceresoli <luca@lucaceresoli.net>"); 903MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>"); 904MODULE_IMPORT_NS(I2C_ATR); 905