Tatenda Chipeperekwa | 326526e | 2017-04-24 16:51:50 -0700 | [diff] [blame] | 1 | /* Copyright (c) 2016-2017, The Linux Foundation. All rights reserved. |
| 2 | * |
| 3 | * This program is free software; you can redistribute it and/or modify |
| 4 | * it under the terms of the GNU General Public License version 2 and |
| 5 | * only version 2 as published by the Free Software Foundation. |
| 6 | * |
| 7 | * This program is distributed in the hope that it will be useful, |
| 8 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 10 | * GNU General Public License for more details. |
| 11 | */ |
| 12 | |
| 13 | #define pr_fmt(fmt) "%s: " fmt, __func__ |
| 14 | |
| 15 | #include <linux/slab.h> |
| 16 | #include <linux/bitops.h> |
| 17 | #include <linux/delay.h> |
| 18 | #include <linux/module.h> |
| 19 | #include <linux/mutex.h> |
| 20 | #include <linux/iopoll.h> |
| 21 | #include <linux/types.h> |
| 22 | #include <linux/of_platform.h> |
| 23 | #include <linux/msm_ext_display.h> |
| 24 | |
| 25 | struct msm_ext_disp_list { |
| 26 | struct msm_ext_disp_init_data *data; |
| 27 | struct list_head list; |
| 28 | }; |
| 29 | |
| 30 | struct msm_ext_disp { |
| 31 | struct msm_ext_disp_data ext_disp_data; |
| 32 | struct platform_device *pdev; |
| 33 | enum msm_ext_disp_type current_disp; |
| 34 | struct msm_ext_disp_audio_codec_ops *ops; |
| 35 | struct extcon_dev audio_sdev; |
| 36 | bool audio_session_on; |
| 37 | struct list_head display_list; |
| 38 | struct mutex lock; |
| 39 | }; |
| 40 | |
| 41 | static const unsigned int msm_ext_disp_supported_cable[] = { |
| 42 | EXTCON_DISP_DP, |
| 43 | EXTCON_DISP_HDMI, |
| 44 | EXTCON_NONE, |
| 45 | }; |
| 46 | |
| 47 | static int msm_ext_disp_extcon_register(struct msm_ext_disp *ext_disp) |
| 48 | { |
| 49 | int ret = 0; |
| 50 | |
| 51 | if (!ext_disp) { |
| 52 | pr_err("invalid params\n"); |
| 53 | return -EINVAL; |
| 54 | } |
| 55 | |
| 56 | memset(&ext_disp->audio_sdev, 0x0, sizeof(ext_disp->audio_sdev)); |
| 57 | ext_disp->audio_sdev.supported_cable = msm_ext_disp_supported_cable; |
| 58 | ext_disp->audio_sdev.dev.parent = &ext_disp->pdev->dev; |
| 59 | ret = extcon_dev_register(&ext_disp->audio_sdev); |
| 60 | if (ret) { |
| 61 | pr_err("audio registration failed"); |
| 62 | return ret; |
| 63 | } |
| 64 | |
| 65 | pr_debug("extcon registration done\n"); |
| 66 | |
| 67 | return ret; |
| 68 | } |
| 69 | |
| 70 | static void msm_ext_disp_extcon_unregister(struct msm_ext_disp *ext_disp) |
| 71 | { |
| 72 | if (!ext_disp) { |
| 73 | pr_err("Invalid params\n"); |
| 74 | return; |
| 75 | } |
| 76 | |
| 77 | extcon_dev_unregister(&ext_disp->audio_sdev); |
| 78 | } |
| 79 | |
| 80 | static const char *msm_ext_disp_name(enum msm_ext_disp_type type) |
| 81 | { |
| 82 | switch (type) { |
| 83 | case EXT_DISPLAY_TYPE_HDMI: return "EXT_DISPLAY_TYPE_HDMI"; |
| 84 | case EXT_DISPLAY_TYPE_DP: return "EXT_DISPLAY_TYPE_DP"; |
| 85 | default: return "???"; |
| 86 | } |
| 87 | } |
| 88 | |
| 89 | static int msm_ext_disp_add_intf_data(struct msm_ext_disp *ext_disp, |
| 90 | struct msm_ext_disp_init_data *data) |
| 91 | { |
| 92 | struct msm_ext_disp_list *node; |
| 93 | |
| 94 | if (!ext_disp && !data) { |
| 95 | pr_err("Invalid params\n"); |
| 96 | return -EINVAL; |
| 97 | } |
| 98 | |
| 99 | node = kzalloc(sizeof(*node), GFP_KERNEL); |
| 100 | if (!node) |
| 101 | return -ENOMEM; |
| 102 | |
| 103 | node->data = data; |
| 104 | list_add(&node->list, &ext_disp->display_list); |
| 105 | |
| 106 | pr_debug("Added new display (%s)\n", msm_ext_disp_name(data->type)); |
| 107 | |
| 108 | return 0; |
| 109 | } |
| 110 | |
| 111 | static int msm_ext_disp_get_intf_data(struct msm_ext_disp *ext_disp, |
| 112 | enum msm_ext_disp_type type, |
| 113 | struct msm_ext_disp_init_data **data) |
| 114 | { |
| 115 | int ret = 0; |
| 116 | struct msm_ext_disp_list *node; |
| 117 | struct list_head *position = NULL; |
| 118 | |
| 119 | if (!ext_disp || !data || type < EXT_DISPLAY_TYPE_HDMI || |
| 120 | type >= EXT_DISPLAY_TYPE_MAX) { |
| 121 | pr_err("Invalid params\n"); |
| 122 | ret = -EINVAL; |
| 123 | goto end; |
| 124 | } |
| 125 | |
| 126 | *data = NULL; |
| 127 | list_for_each(position, &ext_disp->display_list) { |
| 128 | node = list_entry(position, struct msm_ext_disp_list, list); |
| 129 | if (node->data->type == type) { |
| 130 | *data = node->data; |
| 131 | break; |
| 132 | } |
| 133 | } |
| 134 | |
| 135 | if (!*data) { |
| 136 | pr_err("Display not found (%s)\n", msm_ext_disp_name(type)); |
| 137 | ret = -ENODEV; |
| 138 | } |
| 139 | end: |
| 140 | return ret; |
| 141 | } |
| 142 | |
| 143 | static int msm_ext_disp_process_audio(struct msm_ext_disp *ext_disp, |
| 144 | enum msm_ext_disp_type type, |
| 145 | enum msm_ext_disp_cable_state new_state) |
| 146 | { |
| 147 | int ret = 0; |
| 148 | int state; |
| 149 | |
| 150 | state = ext_disp->audio_sdev.state; |
| 151 | ret = extcon_set_state_sync(&ext_disp->audio_sdev, |
| 152 | ext_disp->current_disp, !!new_state); |
| 153 | |
| 154 | pr_debug("Audio state %s %d\n", |
| 155 | ext_disp->audio_sdev.state == state ? |
| 156 | "is same" : "switched to", |
| 157 | ext_disp->audio_sdev.state); |
| 158 | |
| 159 | return ret; |
| 160 | } |
| 161 | |
| 162 | static struct msm_ext_disp *msm_ext_disp_validate_and_get( |
| 163 | struct platform_device *pdev, |
| 164 | enum msm_ext_disp_type type, |
| 165 | enum msm_ext_disp_cable_state state) |
| 166 | { |
| 167 | struct msm_ext_disp_data *ext_disp_data; |
| 168 | struct msm_ext_disp *ext_disp; |
| 169 | |
| 170 | if (!pdev) { |
| 171 | pr_err("invalid platform device\n"); |
| 172 | goto err; |
| 173 | } |
| 174 | |
| 175 | ext_disp_data = platform_get_drvdata(pdev); |
| 176 | if (!ext_disp_data) { |
| 177 | pr_err("invalid drvdata\n"); |
| 178 | goto err; |
| 179 | } |
| 180 | |
| 181 | ext_disp = container_of(ext_disp_data, |
| 182 | struct msm_ext_disp, ext_disp_data); |
| 183 | |
| 184 | if (state < EXT_DISPLAY_CABLE_DISCONNECT || |
| 185 | state >= EXT_DISPLAY_CABLE_STATE_MAX) { |
| 186 | pr_err("invalid HPD state (%d)\n", state); |
| 187 | goto err; |
| 188 | } |
| 189 | |
| 190 | if (state == EXT_DISPLAY_CABLE_CONNECT) { |
| 191 | if (ext_disp->current_disp != EXT_DISPLAY_TYPE_MAX && |
| 192 | ext_disp->current_disp != type) { |
| 193 | pr_err("invalid interface call\n"); |
| 194 | goto err; |
| 195 | } |
| 196 | } else { |
| 197 | if (ext_disp->current_disp == EXT_DISPLAY_TYPE_MAX || |
| 198 | ext_disp->current_disp != type) { |
| 199 | pr_err("invalid interface call\n"); |
| 200 | goto err; |
| 201 | } |
| 202 | } |
| 203 | return ext_disp; |
| 204 | err: |
| 205 | return ERR_PTR(-EINVAL); |
| 206 | } |
| 207 | |
| 208 | static int msm_ext_disp_update_audio_ops(struct msm_ext_disp *ext_disp, |
| 209 | enum msm_ext_disp_type type, |
| 210 | enum msm_ext_disp_cable_state state) |
| 211 | { |
| 212 | int ret = 0; |
| 213 | struct msm_ext_disp_init_data *data = NULL; |
| 214 | |
| 215 | ret = msm_ext_disp_get_intf_data(ext_disp, type, &data); |
| 216 | if (ret || !data) { |
| 217 | pr_err("interface %s not found\n", msm_ext_disp_name(type)); |
| 218 | goto end; |
| 219 | } |
| 220 | |
Ajay Singh Parmar | 255c4f6 | 2017-08-23 08:37:46 -0700 | [diff] [blame^] | 221 | if (!ext_disp->ops) { |
| 222 | pr_err("codec ops not registered\n"); |
| 223 | ret = -EINVAL; |
| 224 | goto end; |
| 225 | } |
| 226 | |
Tatenda Chipeperekwa | 326526e | 2017-04-24 16:51:50 -0700 | [diff] [blame] | 227 | if (state == EXT_DISPLAY_CABLE_CONNECT) { |
| 228 | /* connect codec with interface */ |
| 229 | *ext_disp->ops = data->codec_ops; |
| 230 | |
| 231 | /* update pdev for interface to use */ |
| 232 | ext_disp->ext_disp_data.intf_pdev = data->pdev; |
| 233 | ext_disp->ext_disp_data.intf_data = data->intf_data; |
| 234 | |
| 235 | ext_disp->current_disp = type; |
| 236 | |
| 237 | pr_debug("codec ops set for %s\n", msm_ext_disp_name(type)); |
| 238 | } else if (state == EXT_DISPLAY_CABLE_DISCONNECT) { |
| 239 | *ext_disp->ops = (struct msm_ext_disp_audio_codec_ops){NULL}; |
| 240 | ext_disp->current_disp = EXT_DISPLAY_TYPE_MAX; |
| 241 | |
| 242 | pr_debug("codec ops cleared for %s\n", msm_ext_disp_name(type)); |
| 243 | } |
| 244 | end: |
| 245 | return ret; |
| 246 | } |
| 247 | |
| 248 | static int msm_ext_disp_audio_config(struct platform_device *pdev, |
| 249 | enum msm_ext_disp_type type, |
| 250 | enum msm_ext_disp_cable_state state) |
| 251 | { |
| 252 | int ret = 0; |
| 253 | struct msm_ext_disp *ext_disp; |
| 254 | |
| 255 | ext_disp = msm_ext_disp_validate_and_get(pdev, type, state); |
| 256 | if (IS_ERR(ext_disp)) { |
| 257 | ret = PTR_ERR(ext_disp); |
| 258 | goto end; |
| 259 | } |
| 260 | |
| 261 | mutex_lock(&ext_disp->lock); |
| 262 | ret = msm_ext_disp_update_audio_ops(ext_disp, type, state); |
| 263 | mutex_unlock(&ext_disp->lock); |
| 264 | end: |
| 265 | return ret; |
| 266 | } |
| 267 | |
| 268 | static int msm_ext_disp_audio_notify(struct platform_device *pdev, |
| 269 | enum msm_ext_disp_type type, |
| 270 | enum msm_ext_disp_cable_state state) |
| 271 | { |
| 272 | int ret = 0; |
| 273 | struct msm_ext_disp *ext_disp; |
| 274 | |
| 275 | ext_disp = msm_ext_disp_validate_and_get(pdev, type, state); |
| 276 | if (IS_ERR(ext_disp)) { |
| 277 | ret = PTR_ERR(ext_disp); |
| 278 | goto end; |
| 279 | } |
| 280 | |
| 281 | mutex_lock(&ext_disp->lock); |
| 282 | ret = msm_ext_disp_process_audio(ext_disp, type, state); |
| 283 | mutex_unlock(&ext_disp->lock); |
| 284 | end: |
| 285 | return ret; |
| 286 | } |
| 287 | |
| 288 | int msm_hdmi_register_audio_codec(struct platform_device *pdev, |
| 289 | struct msm_ext_disp_audio_codec_ops *ops) |
| 290 | { |
| 291 | return msm_ext_disp_register_audio_codec(pdev, ops); |
| 292 | } |
| 293 | |
| 294 | int msm_ext_disp_register_audio_codec(struct platform_device *pdev, |
| 295 | struct msm_ext_disp_audio_codec_ops *ops) |
| 296 | { |
| 297 | int ret = 0; |
| 298 | struct msm_ext_disp *ext_disp = NULL; |
| 299 | struct msm_ext_disp_data *ext_disp_data = NULL; |
| 300 | |
| 301 | if (!pdev || !ops) { |
| 302 | pr_err("Invalid params\n"); |
| 303 | return -EINVAL; |
| 304 | } |
| 305 | |
| 306 | ext_disp_data = platform_get_drvdata(pdev); |
| 307 | if (!ext_disp_data) { |
| 308 | pr_err("Invalid drvdata\n"); |
| 309 | return -EINVAL; |
| 310 | } |
| 311 | |
| 312 | ext_disp = container_of(ext_disp_data, struct msm_ext_disp, |
| 313 | ext_disp_data); |
| 314 | |
| 315 | mutex_lock(&ext_disp->lock); |
| 316 | |
| 317 | if ((ext_disp->current_disp != EXT_DISPLAY_TYPE_MAX) |
| 318 | && ext_disp->ops) { |
| 319 | pr_err("Codec already registered\n"); |
| 320 | ret = -EINVAL; |
| 321 | goto end; |
| 322 | } |
| 323 | |
| 324 | ext_disp->ops = ops; |
| 325 | |
| 326 | pr_debug("audio codec registered\n"); |
| 327 | |
| 328 | end: |
| 329 | mutex_unlock(&ext_disp->lock); |
| 330 | |
| 331 | return ret; |
| 332 | } |
| 333 | |
| 334 | static int msm_ext_disp_validate_intf(struct msm_ext_disp_init_data *init_data) |
| 335 | { |
| 336 | if (!init_data) { |
| 337 | pr_err("Invalid init_data\n"); |
| 338 | return -EINVAL; |
| 339 | } |
| 340 | |
| 341 | if (!init_data->pdev) { |
| 342 | pr_err("Invalid display intf pdev\n"); |
| 343 | return -EINVAL; |
| 344 | } |
| 345 | |
| 346 | if (!init_data->codec_ops.get_audio_edid_blk || |
| 347 | !init_data->codec_ops.cable_status || |
| 348 | !init_data->codec_ops.audio_info_setup) { |
| 349 | pr_err("Invalid codec operation pointers\n"); |
| 350 | return -EINVAL; |
| 351 | } |
| 352 | |
| 353 | return 0; |
| 354 | } |
| 355 | |
| 356 | int msm_ext_disp_register_intf(struct platform_device *pdev, |
| 357 | struct msm_ext_disp_init_data *init_data) |
| 358 | { |
| 359 | int ret = 0; |
| 360 | struct msm_ext_disp_init_data *data = NULL; |
| 361 | struct msm_ext_disp *ext_disp = NULL; |
| 362 | struct msm_ext_disp_data *ext_disp_data = NULL; |
| 363 | |
| 364 | if (!pdev || !init_data) { |
| 365 | pr_err("Invalid params\n"); |
| 366 | return -EINVAL; |
| 367 | } |
| 368 | |
| 369 | ext_disp_data = platform_get_drvdata(pdev); |
| 370 | if (!ext_disp_data) { |
| 371 | pr_err("Invalid drvdata\n"); |
| 372 | return -EINVAL; |
| 373 | } |
| 374 | |
| 375 | ext_disp = container_of(ext_disp_data, struct msm_ext_disp, |
| 376 | ext_disp_data); |
| 377 | |
| 378 | mutex_lock(&ext_disp->lock); |
| 379 | |
| 380 | ret = msm_ext_disp_validate_intf(init_data); |
| 381 | if (ret) |
| 382 | goto end; |
| 383 | |
| 384 | ret = msm_ext_disp_get_intf_data(ext_disp, init_data->type, &data); |
| 385 | if (!ret) { |
| 386 | pr_err("%s already registered\n", |
| 387 | msm_ext_disp_name(init_data->type)); |
| 388 | goto end; |
| 389 | } |
| 390 | |
| 391 | ret = msm_ext_disp_add_intf_data(ext_disp, init_data); |
| 392 | if (ret) |
| 393 | goto end; |
| 394 | |
| 395 | init_data->intf_ops.audio_config = msm_ext_disp_audio_config; |
| 396 | init_data->intf_ops.audio_notify = msm_ext_disp_audio_notify; |
| 397 | |
| 398 | pr_debug("%s registered\n", msm_ext_disp_name(init_data->type)); |
| 399 | |
| 400 | mutex_unlock(&ext_disp->lock); |
| 401 | |
| 402 | return ret; |
| 403 | |
| 404 | end: |
| 405 | mutex_unlock(&ext_disp->lock); |
| 406 | |
| 407 | return ret; |
| 408 | } |
| 409 | |
| 410 | static int msm_ext_disp_probe(struct platform_device *pdev) |
| 411 | { |
| 412 | int ret = 0; |
| 413 | struct device_node *of_node = NULL; |
| 414 | struct msm_ext_disp *ext_disp = NULL; |
| 415 | |
| 416 | if (!pdev) { |
| 417 | pr_err("No platform device found\n"); |
| 418 | ret = -ENODEV; |
| 419 | goto end; |
| 420 | } |
| 421 | |
| 422 | of_node = pdev->dev.of_node; |
| 423 | if (!of_node) { |
| 424 | pr_err("No device node found\n"); |
| 425 | ret = -ENODEV; |
| 426 | goto end; |
| 427 | } |
| 428 | |
| 429 | ext_disp = devm_kzalloc(&pdev->dev, sizeof(*ext_disp), GFP_KERNEL); |
| 430 | if (!ext_disp) { |
| 431 | ret = -ENOMEM; |
| 432 | goto end; |
| 433 | } |
| 434 | |
| 435 | platform_set_drvdata(pdev, &ext_disp->ext_disp_data); |
| 436 | ext_disp->pdev = pdev; |
| 437 | |
| 438 | ret = msm_ext_disp_extcon_register(ext_disp); |
| 439 | if (ret) |
| 440 | goto extcon_dev_failure; |
| 441 | |
| 442 | ret = of_platform_populate(of_node, NULL, NULL, &pdev->dev); |
| 443 | if (ret) { |
| 444 | pr_err("Failed to add child devices. Error = %d\n", ret); |
| 445 | goto child_node_failure; |
| 446 | } else { |
| 447 | pr_debug("%s: Added child devices.\n", __func__); |
| 448 | } |
| 449 | |
| 450 | mutex_init(&ext_disp->lock); |
| 451 | |
| 452 | INIT_LIST_HEAD(&ext_disp->display_list); |
| 453 | ext_disp->current_disp = EXT_DISPLAY_TYPE_MAX; |
| 454 | |
| 455 | return ret; |
| 456 | |
| 457 | child_node_failure: |
| 458 | msm_ext_disp_extcon_unregister(ext_disp); |
| 459 | extcon_dev_failure: |
| 460 | devm_kfree(&ext_disp->pdev->dev, ext_disp); |
| 461 | end: |
| 462 | return ret; |
| 463 | } |
| 464 | |
| 465 | static int msm_ext_disp_remove(struct platform_device *pdev) |
| 466 | { |
| 467 | int ret = 0; |
| 468 | struct msm_ext_disp *ext_disp = NULL; |
| 469 | struct msm_ext_disp_data *ext_disp_data = NULL; |
| 470 | |
| 471 | if (!pdev) { |
| 472 | pr_err("No platform device\n"); |
| 473 | ret = -ENODEV; |
| 474 | goto end; |
| 475 | } |
| 476 | |
| 477 | ext_disp_data = platform_get_drvdata(pdev); |
| 478 | if (!ext_disp_data) { |
| 479 | pr_err("No drvdata found\n"); |
| 480 | ret = -ENODEV; |
| 481 | goto end; |
| 482 | } |
| 483 | |
| 484 | ext_disp = container_of(ext_disp_data, struct msm_ext_disp, |
| 485 | ext_disp_data); |
| 486 | |
| 487 | msm_ext_disp_extcon_unregister(ext_disp); |
| 488 | |
| 489 | mutex_destroy(&ext_disp->lock); |
| 490 | devm_kfree(&ext_disp->pdev->dev, ext_disp); |
| 491 | |
| 492 | end: |
| 493 | return ret; |
| 494 | } |
| 495 | |
| 496 | static const struct of_device_id msm_ext_dt_match[] = { |
| 497 | {.compatible = "qcom,msm-ext-disp",}, |
| 498 | { /* Sentinel */ }, |
| 499 | }; |
| 500 | MODULE_DEVICE_TABLE(of, msm_ext_dt_match); |
| 501 | |
| 502 | static struct platform_driver this_driver = { |
| 503 | .probe = msm_ext_disp_probe, |
| 504 | .remove = msm_ext_disp_remove, |
| 505 | .driver = { |
| 506 | .name = "msm-ext-disp", |
| 507 | .of_match_table = msm_ext_dt_match, |
| 508 | }, |
| 509 | }; |
| 510 | |
| 511 | static int __init msm_ext_disp_init(void) |
| 512 | { |
| 513 | int ret = 0; |
| 514 | |
| 515 | ret = platform_driver_register(&this_driver); |
| 516 | if (ret) |
| 517 | pr_err("failed, ret = %d\n", ret); |
| 518 | |
| 519 | return ret; |
| 520 | } |
| 521 | |
| 522 | static void __exit msm_ext_disp_exit(void) |
| 523 | { |
| 524 | platform_driver_unregister(&this_driver); |
| 525 | } |
| 526 | |
| 527 | subsys_initcall(msm_ext_disp_init); |
| 528 | module_exit(msm_ext_disp_exit); |
| 529 | |
| 530 | MODULE_LICENSE("GPL v2"); |
| 531 | MODULE_DESCRIPTION("MSM External Display"); |