Meng Wang | 43bbb87 | 2018-12-10 12:32:05 +0800 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
Banajit Goswami | 0618368 | 2018-07-31 00:31:14 -0700 | [diff] [blame] | 2 | /* |
| 3 | * Copyright (c) 2018, The Linux Foundation. All rights reserved. |
| 4 | */ |
| 5 | |
| 6 | #include <linux/platform_device.h> |
| 7 | #include <linux/slab.h> |
| 8 | #include <linux/module.h> |
| 9 | #include <linux/of_device.h> |
| 10 | #include <soc/snd_event.h> |
| 11 | |
| 12 | struct snd_event_client { |
| 13 | struct list_head node; |
| 14 | |
| 15 | struct device *dev; |
| 16 | const struct snd_event_ops *ops; |
| 17 | void *data; |
| 18 | |
| 19 | bool attached; |
| 20 | bool state; |
| 21 | }; |
| 22 | |
| 23 | struct snd_event_client_array { |
| 24 | struct device *dev; |
| 25 | struct snd_event_client *clnt; |
| 26 | void *data; |
| 27 | int (*compare)(struct device *, void *); |
| 28 | }; |
| 29 | |
| 30 | struct snd_event_clients { |
| 31 | size_t num_clients; |
| 32 | struct snd_event_client_array *cl_arr; |
| 33 | }; |
| 34 | |
| 35 | struct snd_master { |
| 36 | struct device *dev; |
| 37 | const struct snd_event_ops *ops; |
| 38 | void *data; |
| 39 | |
| 40 | bool state; |
| 41 | bool fwk_state; |
| 42 | bool clients_found; |
| 43 | struct snd_event_clients *clients; |
| 44 | }; |
| 45 | |
| 46 | static DEFINE_MUTEX(snd_event_mutex); |
| 47 | static LIST_HEAD(snd_event_client_list); |
| 48 | static struct snd_master *master; |
| 49 | |
| 50 | static struct snd_event_client *find_snd_event_client(struct device *dev) |
| 51 | { |
| 52 | struct snd_event_client *c; |
| 53 | |
| 54 | list_for_each_entry(c, &snd_event_client_list, node) |
| 55 | if ((c->dev == dev) && c->ops) |
| 56 | return c; |
| 57 | |
| 58 | return NULL; |
| 59 | } |
| 60 | |
| 61 | static int check_and_update_fwk_state(void) |
| 62 | { |
| 63 | bool new_fwk_state = true; |
| 64 | struct snd_event_client *c; |
| 65 | int ret = 0; |
| 66 | int i = 0; |
| 67 | |
| 68 | for (i = 0; i < master->clients->num_clients; i++) { |
| 69 | c = master->clients->cl_arr[i].clnt; |
| 70 | new_fwk_state &= c->state; |
| 71 | } |
| 72 | new_fwk_state &= master->state; |
| 73 | |
| 74 | if (master->fwk_state ^ new_fwk_state) { |
| 75 | if (new_fwk_state) { |
| 76 | for (i = 0; i < master->clients->num_clients; i++) { |
| 77 | c = master->clients->cl_arr[i].clnt; |
| 78 | if (c->ops->enable) { |
| 79 | ret = c->ops->enable(c->dev, c->data); |
| 80 | if (ret) { |
| 81 | dev_err(c->dev, |
| 82 | "%s: enable failed\n", |
| 83 | __func__); |
| 84 | goto dev_en_failed; |
| 85 | } |
| 86 | } |
| 87 | } |
| 88 | if (master->ops->enable) { |
| 89 | ret = master->ops->enable(master->dev, |
| 90 | master->data); |
| 91 | if (ret) { |
| 92 | dev_err(master->dev, |
| 93 | "%s: enable failed\n", |
| 94 | __func__); |
| 95 | goto mstr_en_failed; |
| 96 | } |
| 97 | } |
| 98 | } else { |
| 99 | if (master->ops->disable) |
| 100 | master->ops->disable(master->dev, |
| 101 | master->data); |
| 102 | for (i = 0; i < master->clients->num_clients; i++) { |
| 103 | c = master->clients->cl_arr[i].clnt; |
| 104 | if (c->ops->disable) |
| 105 | c->ops->disable(c->dev, c->data); |
| 106 | } |
| 107 | } |
| 108 | master->fwk_state = new_fwk_state; |
| 109 | } |
| 110 | goto exit; |
| 111 | |
| 112 | mstr_en_failed: |
| 113 | i = master->clients->num_clients; |
| 114 | dev_en_failed: |
| 115 | for (; i > 0; i--) { |
| 116 | c = master->clients->cl_arr[i - 1].clnt; |
| 117 | if (c->ops->disable) |
| 118 | c->ops->disable(c->dev, c->data); |
| 119 | } |
| 120 | exit: |
| 121 | return ret; |
| 122 | } |
| 123 | |
| 124 | static int snd_event_find_clients(struct snd_master *master) |
| 125 | { |
| 126 | struct snd_event_clients *clients = master->clients; |
| 127 | int i = 0; |
| 128 | int ret = 0; |
| 129 | |
| 130 | for (i = 0; i < clients->num_clients; i++) { |
| 131 | struct snd_event_client_array *c_arr = &clients->cl_arr[i]; |
| 132 | struct snd_event_client *c; |
| 133 | |
| 134 | if (c_arr->dev) { |
| 135 | pr_err("%s: client already present dev=%pK\n", |
| 136 | __func__, c_arr->dev); |
| 137 | continue; |
| 138 | } |
| 139 | |
| 140 | list_for_each_entry(c, &snd_event_client_list, node) { |
| 141 | if (c->attached) |
| 142 | continue; |
| 143 | |
| 144 | if (c_arr->compare(c->dev, c_arr->data)) { |
| 145 | dev_dbg(master->dev, |
| 146 | "%s: found client, dev=%pK\n", |
| 147 | __func__, c->dev); |
| 148 | c_arr->dev = c->dev; |
| 149 | c_arr->clnt = c; |
| 150 | c->attached = true; |
| 151 | break; |
| 152 | } |
| 153 | } |
| 154 | if (!c_arr->dev) { |
| 155 | dev_dbg(master->dev, |
| 156 | "%s: failed to find some client\n", |
| 157 | __func__); |
| 158 | ret = -ENXIO; |
| 159 | break; |
| 160 | } |
| 161 | } |
| 162 | |
| 163 | return ret; |
| 164 | } |
| 165 | |
| 166 | /* |
| 167 | * snd_event_client_register - Register a client with the SND event FW |
| 168 | * |
| 169 | * @dev: Pointer to the "struct device" associated with the client |
| 170 | * @snd_ev_ops: Pointer to the snd_event_ops struct for the client containing |
| 171 | * callback functions |
| 172 | * @data: Pointer to any additional data that the caller wants to get back |
| 173 | * with callback functions |
| 174 | * |
| 175 | * Returns 0 on success or error on failure. |
| 176 | */ |
| 177 | int snd_event_client_register(struct device *dev, |
| 178 | const struct snd_event_ops *snd_ev_ops, |
| 179 | void *data) |
| 180 | { |
| 181 | struct snd_event_client *c; |
| 182 | |
| 183 | if (!dev) { |
| 184 | pr_err("%s: dev is NULL\n", __func__); |
| 185 | return -EINVAL; |
| 186 | } |
| 187 | |
| 188 | c = kzalloc(sizeof(*c), GFP_KERNEL); |
| 189 | if (!c) |
| 190 | return -ENOMEM; |
| 191 | |
| 192 | c->dev = dev; |
| 193 | c->ops = snd_ev_ops; |
| 194 | c->data = data; |
| 195 | |
| 196 | dev_dbg(dev, "%s: adding client to SND event FW (ops %pK)\n", |
| 197 | __func__, snd_ev_ops); |
| 198 | |
| 199 | mutex_lock(&snd_event_mutex); |
| 200 | list_add_tail(&c->node, &snd_event_client_list); |
| 201 | |
| 202 | if (master && !master->clients_found) { |
| 203 | if (snd_event_find_clients(master)) { |
| 204 | dev_dbg(dev, "%s: Failed to find all clients\n", |
| 205 | __func__); |
| 206 | goto exit; |
| 207 | } |
| 208 | master->clients_found = true; |
| 209 | } |
| 210 | |
| 211 | exit: |
| 212 | mutex_unlock(&snd_event_mutex); |
| 213 | return 0; |
| 214 | } |
| 215 | EXPORT_SYMBOL(snd_event_client_register); |
| 216 | |
| 217 | /* |
| 218 | * snd_event_client_deregister - Remove a client from the SND event FW |
| 219 | * |
| 220 | * @dev: Pointer to the "struct device" associated with the client |
| 221 | * |
| 222 | * Returns 0 on success or error on failure. |
| 223 | */ |
| 224 | int snd_event_client_deregister(struct device *dev) |
| 225 | { |
| 226 | struct snd_event_client *c; |
| 227 | int ret = 0; |
| 228 | int i = 0; |
| 229 | |
| 230 | if (!dev) { |
| 231 | pr_err("%s: dev is NULL\n", __func__); |
| 232 | return -EINVAL; |
| 233 | } |
| 234 | |
| 235 | mutex_lock(&snd_event_mutex); |
| 236 | if (list_empty(&snd_event_client_list)) { |
| 237 | dev_dbg(dev, "%s: No SND client registered\n", __func__); |
| 238 | ret = -ENODEV; |
| 239 | goto exit; |
| 240 | } |
| 241 | |
| 242 | c = find_snd_event_client(dev); |
| 243 | if (!c || (c->dev != dev)) { |
| 244 | dev_dbg(dev, "%s: No matching snd dev found\n", __func__); |
| 245 | ret = -ENODEV; |
| 246 | goto exit; |
| 247 | } |
| 248 | |
| 249 | c->state = false; |
| 250 | |
| 251 | if (master && master->clients_found) { |
| 252 | struct snd_event_client *d; |
| 253 | bool dev_found = false; |
| 254 | |
| 255 | for (i = 0; i < master->clients->num_clients; i++) { |
| 256 | d = master->clients->cl_arr[i].clnt; |
| 257 | if (c->dev == d->dev) { |
| 258 | dev_found = true; |
| 259 | break; |
| 260 | } |
| 261 | } |
| 262 | if (dev_found) { |
| 263 | ret = check_and_update_fwk_state(); |
| 264 | master->clients_found = false; |
| 265 | } |
| 266 | } |
| 267 | |
| 268 | list_del(&c->node); |
| 269 | kfree(c); |
| 270 | exit: |
| 271 | mutex_unlock(&snd_event_mutex); |
| 272 | return ret; |
| 273 | } |
| 274 | EXPORT_SYMBOL(snd_event_client_deregister); |
| 275 | |
| 276 | /* |
| 277 | * snd_event_mstr_add_client - Add a client to the master's list of clients |
| 278 | * |
| 279 | * @snd_clients: list of clients associated with this master |
| 280 | * @compare: Pointer to the compare callback function that master will use to |
| 281 | * confirm the clients |
| 282 | * @data: Address to any additional data that the master wants to get back with |
| 283 | * compare callback functions |
| 284 | */ |
| 285 | void snd_event_mstr_add_client(struct snd_event_clients **snd_clients, |
| 286 | int (*compare)(struct device *, void *), |
| 287 | void *data) |
| 288 | { |
| 289 | struct snd_event_clients *client = *snd_clients; |
| 290 | |
| 291 | if (IS_ERR(client)) { |
| 292 | pr_err("%s: snd_clients is invalid\n", __func__); |
| 293 | return; |
| 294 | } |
| 295 | |
| 296 | if (!client) { |
| 297 | client = kzalloc(sizeof(*client), GFP_KERNEL); |
| 298 | if (!client) { |
| 299 | *snd_clients = ERR_PTR(-ENOMEM); |
| 300 | return; |
| 301 | } |
| 302 | client->cl_arr = kzalloc(sizeof(struct snd_event_client_array), |
| 303 | GFP_KERNEL); |
Tanya Dixit | d7a6390 | 2018-10-17 17:20:04 +0530 | [diff] [blame] | 304 | if (!client->cl_arr) { |
| 305 | *snd_clients = ERR_PTR(-ENOMEM); |
| 306 | return; |
| 307 | } |
Banajit Goswami | 0618368 | 2018-07-31 00:31:14 -0700 | [diff] [blame] | 308 | *snd_clients = client; |
| 309 | } else { |
| 310 | struct snd_event_client_array *new; |
| 311 | |
| 312 | new = krealloc(client->cl_arr, |
| 313 | (client->num_clients + 1) * sizeof(*new), |
| 314 | GFP_KERNEL | __GFP_ZERO); |
| 315 | if (!new) { |
| 316 | *snd_clients = ERR_PTR(-ENOMEM); |
| 317 | return; |
| 318 | } |
| 319 | client->cl_arr = new; |
| 320 | } |
| 321 | |
| 322 | client->cl_arr[client->num_clients].dev = NULL; |
| 323 | client->cl_arr[client->num_clients].data = data; |
| 324 | client->cl_arr[client->num_clients].compare = compare; |
| 325 | client->num_clients++; |
| 326 | } |
| 327 | EXPORT_SYMBOL(snd_event_mstr_add_client); |
| 328 | |
| 329 | /* |
| 330 | * snd_event_master_register - Register a master with the SND event FW |
| 331 | * |
| 332 | * @dev: Pointer to the "struct device" associated with the master |
| 333 | * @ops: Pointer to the snd_event_ops struct for the master containing |
| 334 | * callback functions |
| 335 | * @clients: List of clients for the master |
| 336 | * @data: Pointer to any additional data that the caller wants to get back |
| 337 | * with callback functions |
| 338 | * |
| 339 | * Returns 0 on success or error on failure. |
| 340 | * |
| 341 | * Prerequisite: |
| 342 | * clients list must not be empty. |
| 343 | * All clients for the master must have to be registered by calling |
| 344 | * snd_event_mstr_add_client() before calling this API to register a |
| 345 | * master with SND event fwk. |
| 346 | */ |
| 347 | int snd_event_master_register(struct device *dev, |
| 348 | const struct snd_event_ops *ops, |
| 349 | struct snd_event_clients *clients, |
| 350 | void *data) |
| 351 | { |
| 352 | struct snd_master *new_master; |
| 353 | int ret = 0; |
| 354 | |
| 355 | if (!dev) { |
| 356 | pr_err("%s: dev is NULL\n", __func__); |
| 357 | return -EINVAL; |
| 358 | } |
| 359 | |
| 360 | mutex_lock(&snd_event_mutex); |
| 361 | if (master) { |
| 362 | dev_err(dev, "%s: master already allocated with %pK\n", |
| 363 | __func__, master->dev); |
| 364 | ret = -EALREADY; |
| 365 | goto exit; |
| 366 | } |
| 367 | mutex_unlock(&snd_event_mutex); |
| 368 | |
| 369 | if (!clients || IS_ERR(clients)) { |
| 370 | dev_err(dev, "%s: Invalid clients ptr\n", __func__); |
| 371 | return -EINVAL; |
| 372 | } |
| 373 | |
| 374 | new_master = kzalloc(sizeof(*new_master), GFP_KERNEL); |
| 375 | if (!new_master) |
| 376 | return -ENOMEM; |
| 377 | |
| 378 | new_master->dev = dev; |
| 379 | new_master->ops = ops; |
| 380 | new_master->data = data; |
| 381 | new_master->clients = clients; |
| 382 | |
| 383 | dev_dbg(dev, "adding master to SND event FW (ops %pK)\n", ops); |
| 384 | |
| 385 | mutex_lock(&snd_event_mutex); |
| 386 | |
| 387 | master = new_master; |
| 388 | |
| 389 | ret = snd_event_find_clients(master); |
| 390 | if (ret) { |
| 391 | dev_dbg(dev, "%s: Failed to find all clients\n", __func__); |
| 392 | ret = 0; |
| 393 | goto exit; |
| 394 | } |
| 395 | master->clients_found = true; |
| 396 | |
| 397 | exit: |
| 398 | mutex_unlock(&snd_event_mutex); |
| 399 | return ret; |
| 400 | } |
| 401 | EXPORT_SYMBOL(snd_event_master_register); |
| 402 | |
| 403 | /* |
| 404 | * snd_event_master_deregister - Remove a master from the SND event FW |
| 405 | * |
| 406 | * @dev: Pointer to the "struct device" associated with the master |
| 407 | * |
| 408 | * Returns 0 on success or error on failure. |
| 409 | */ |
| 410 | int snd_event_master_deregister(struct device *dev) |
| 411 | { |
| 412 | int ret = 0; |
| 413 | |
| 414 | if (!dev) { |
| 415 | pr_err("%s: dev is NULL\n", __func__); |
| 416 | return -EINVAL; |
| 417 | } |
| 418 | |
| 419 | mutex_lock(&snd_event_mutex); |
| 420 | if (!master) { |
| 421 | dev_dbg(dev, "%s: No master found\n", __func__); |
| 422 | ret = -ENODEV; |
| 423 | goto exit; |
| 424 | } |
| 425 | |
| 426 | if (master->dev != dev) { |
| 427 | dev_dbg(dev, "%s: device is not a Master\n", __func__); |
| 428 | ret = -ENXIO; |
| 429 | goto exit; |
| 430 | } |
| 431 | |
| 432 | master->state = false; |
| 433 | |
| 434 | if (master && master->clients_found) |
| 435 | ret = check_and_update_fwk_state(); |
| 436 | |
| 437 | kfree(master->clients->cl_arr); |
| 438 | kfree(master->clients); |
| 439 | kfree(master); |
| 440 | master = NULL; |
| 441 | exit: |
| 442 | mutex_unlock(&snd_event_mutex); |
| 443 | return ret; |
| 444 | } |
| 445 | EXPORT_SYMBOL(snd_event_master_deregister); |
| 446 | |
| 447 | /* |
| 448 | * snd_event_notify - Update the state of the Master/client in the SND event FW |
| 449 | * |
| 450 | * @dev: Pointer to the "struct device" associated with the master/client |
| 451 | * @state: UP/DOWN state of the caller (master/client) |
| 452 | * |
| 453 | * Returns 0 on success or error on failure. |
| 454 | */ |
| 455 | int snd_event_notify(struct device *dev, unsigned int state) |
| 456 | { |
| 457 | struct snd_event_client *c; |
| 458 | int ret = 0; |
| 459 | |
| 460 | if (!dev) { |
| 461 | pr_err("%s: dev is NULL\n", __func__); |
| 462 | return -EINVAL; |
| 463 | } |
| 464 | |
| 465 | mutex_lock(&snd_event_mutex); |
| 466 | if (list_empty(&snd_event_client_list) && !master) { |
| 467 | dev_err(dev, "%s: No device registered\n", __func__); |
| 468 | ret = -ENODEV; |
| 469 | goto exit; |
| 470 | } |
| 471 | |
| 472 | c = find_snd_event_client(dev); |
| 473 | if (!c && (!master || (master->dev != dev))) { |
| 474 | dev_err(dev, "%s: No snd dev entry found\n", __func__); |
| 475 | ret = -ENXIO; |
| 476 | goto exit; |
| 477 | } |
| 478 | |
| 479 | if (c) |
| 480 | c->state = !!state; |
| 481 | else |
| 482 | master->state = !!state; |
| 483 | |
| 484 | if (master && master->clients_found) |
| 485 | ret = check_and_update_fwk_state(); |
| 486 | |
| 487 | exit: |
| 488 | mutex_unlock(&snd_event_mutex); |
| 489 | return ret; |
| 490 | } |
| 491 | EXPORT_SYMBOL(snd_event_notify); |
| 492 | |
| 493 | MODULE_LICENSE("GPL v2"); |
| 494 | MODULE_DESCRIPTION("SND event module"); |