Banajit Goswami | de8271c | 2017-01-18 00:28:59 -0800 | [diff] [blame] | 1 | /* Copyright (c) 2015-2017, 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 | #include <linux/kernel.h> |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/errno.h> |
| 16 | #include <linux/slab.h> |
| 17 | #include <linux/init.h> |
| 18 | #include <linux/types.h> |
| 19 | #include <linux/of_device.h> |
| 20 | #include <linux/completion.h> |
| 21 | #include <linux/idr.h> |
| 22 | #include <linux/pm_runtime.h> |
| 23 | #include <linux/soundwire/soundwire.h> |
| 24 | |
| 25 | struct boardinfo { |
| 26 | struct list_head list; |
| 27 | struct swr_boardinfo board_info; |
| 28 | }; |
| 29 | |
| 30 | static LIST_HEAD(board_list); |
| 31 | static LIST_HEAD(swr_master_list); |
| 32 | static DEFINE_MUTEX(board_lock); |
| 33 | static DEFINE_IDR(master_idr); |
| 34 | static DEFINE_MUTEX(swr_lock); |
| 35 | |
| 36 | static struct device_type swr_dev_type; |
| 37 | |
| 38 | #define SOUNDWIRE_NAME_SIZE 32 |
| 39 | |
| 40 | static void swr_master_put(struct swr_master *master) |
| 41 | { |
| 42 | if (master) |
| 43 | put_device(&master->dev); |
| 44 | } |
| 45 | |
| 46 | static struct swr_master *swr_master_get(struct swr_master *master) |
| 47 | { |
| 48 | if (!master || !get_device(&master->dev)) |
| 49 | return NULL; |
| 50 | return master; |
| 51 | } |
| 52 | |
| 53 | static void swr_dev_release(struct device *dev) |
| 54 | { |
| 55 | struct swr_device *swr_dev = to_swr_device(dev); |
| 56 | struct swr_master *master; |
| 57 | |
| 58 | if (!swr_dev) |
| 59 | return; |
| 60 | master = swr_dev->master; |
| 61 | if (!master) |
| 62 | return; |
| 63 | mutex_lock(&master->mlock); |
| 64 | list_del_init(&swr_dev->dev_list); |
| 65 | mutex_unlock(&master->mlock); |
| 66 | swr_master_put(swr_dev->master); |
| 67 | kfree(swr_dev); |
| 68 | } |
| 69 | |
| 70 | /** |
Karthikeyan Mani | d52d579 | 2017-04-04 14:09:09 -0700 | [diff] [blame] | 71 | * swr_remove_device - remove a soundwire device |
| 72 | * @swr_dev: soundwire device to remove |
| 73 | * |
| 74 | * Remove a soundwire device. Go through the soundwire |
| 75 | * device list that master has and remove swr_dev from |
| 76 | * it. |
| 77 | */ |
| 78 | void swr_remove_device(struct swr_device *swr_dev) |
| 79 | { |
| 80 | struct swr_device *swr_dev_loop, *safe; |
| 81 | |
| 82 | list_for_each_entry_safe(swr_dev_loop, safe, |
| 83 | &swr_dev->master->devices, |
| 84 | dev_list) { |
| 85 | if (swr_dev == swr_dev_loop) |
| 86 | list_del(&swr_dev_loop->dev_list); |
| 87 | } |
| 88 | } |
| 89 | EXPORT_SYMBOL(swr_remove_device); |
| 90 | |
| 91 | /** |
Banajit Goswami | de8271c | 2017-01-18 00:28:59 -0800 | [diff] [blame] | 92 | * swr_new_device - instantiate a new soundwire device |
| 93 | * @master: Controller to which device is connected |
| 94 | * @info: Describes the soundwire device |
| 95 | * Context: can sleep |
| 96 | * |
| 97 | * Create a soundwire device. Binding is handled through driver model |
| 98 | * probe/remove methods. A driver may be bound to this device when |
| 99 | * the function gets returned. |
| 100 | * |
| 101 | * Returns a soundwire new device or NULL |
| 102 | */ |
| 103 | struct swr_device *swr_new_device(struct swr_master *master, |
| 104 | struct swr_boardinfo const *info) |
| 105 | { |
| 106 | int result; |
| 107 | struct swr_device *swr; |
| 108 | |
| 109 | if (!master || !swr_master_get(master)) { |
| 110 | pr_err("%s: master is NULL\n", __func__); |
| 111 | return NULL; |
| 112 | } |
| 113 | |
| 114 | swr = kzalloc(sizeof(*swr), GFP_KERNEL); |
| 115 | if (!swr) { |
| 116 | put_device(&master->dev); |
| 117 | return NULL; |
| 118 | } |
| 119 | swr->master = master; |
| 120 | swr->addr = info->addr; |
| 121 | strlcpy(swr->name, info->name, sizeof(swr->name)); |
| 122 | swr->dev.type = &swr_dev_type; |
| 123 | swr->dev.parent = &master->dev; |
| 124 | swr->dev.bus = &soundwire_type; |
| 125 | swr->dev.release = swr_dev_release; |
| 126 | swr->dev.of_node = info->of_node; |
| 127 | mutex_lock(&master->mlock); |
| 128 | list_add_tail(&swr->dev_list, &master->devices); |
| 129 | mutex_unlock(&master->mlock); |
| 130 | |
| 131 | dev_set_name(&swr->dev, "%s.%lx", swr->name, swr->addr); |
| 132 | result = device_register(&swr->dev); |
| 133 | if (result) { |
| 134 | dev_err(&master->dev, "device [%s] register failed err %d\n", |
| 135 | swr->name, result); |
| 136 | goto err_out; |
| 137 | } |
| 138 | dev_dbg(&master->dev, "Device [%s] registered with bus id %s\n", |
| 139 | swr->name, dev_name(&swr->dev)); |
| 140 | return swr; |
| 141 | |
| 142 | err_out: |
| 143 | dev_dbg(&master->dev, "Failed to register swr device %s at 0x%lx %d\n", |
| 144 | swr->name, swr->addr, result); |
| 145 | swr_master_put(master); |
| 146 | kfree(swr); |
| 147 | return NULL; |
| 148 | } |
| 149 | EXPORT_SYMBOL(swr_new_device); |
| 150 | |
| 151 | /** |
Banajit Goswami | de8271c | 2017-01-18 00:28:59 -0800 | [diff] [blame] | 152 | * of_register_swr_devices - register child devices on to the soundwire bus |
| 153 | * @master: pointer to soundwire master device |
| 154 | * |
| 155 | * Registers a soundwire device for each child node of master node which has |
| 156 | * a "swr-devid" property |
| 157 | * |
| 158 | */ |
| 159 | int of_register_swr_devices(struct swr_master *master) |
| 160 | { |
| 161 | struct swr_device *swr; |
| 162 | struct device_node *node; |
| 163 | |
| 164 | if (!master->dev.of_node) |
| 165 | return -EINVAL; |
| 166 | |
| 167 | for_each_available_child_of_node(master->dev.of_node, node) { |
| 168 | struct swr_boardinfo info = {}; |
| 169 | u64 addr; |
| 170 | |
| 171 | dev_dbg(&master->dev, "of_swr:register %s\n", node->full_name); |
| 172 | |
| 173 | if (of_modalias_node(node, info.name, sizeof(info.name)) < 0) { |
| 174 | dev_err(&master->dev, "of_swr:modalias failure %s\n", |
| 175 | node->full_name); |
| 176 | continue; |
| 177 | } |
| 178 | if (of_property_read_u64(node, "reg", &addr)) { |
| 179 | dev_err(&master->dev, "of_swr:invalid reg %s\n", |
| 180 | node->full_name); |
| 181 | continue; |
| 182 | } |
| 183 | info.addr = addr; |
| 184 | info.of_node = of_node_get(node); |
Karthikeyan Mani | e398f18 | 2017-05-03 15:21:21 -0700 | [diff] [blame] | 185 | master->num_dev++; |
Banajit Goswami | de8271c | 2017-01-18 00:28:59 -0800 | [diff] [blame] | 186 | swr = swr_new_device(master, &info); |
| 187 | if (!swr) { |
| 188 | dev_err(&master->dev, "of_swr: Register failed %s\n", |
| 189 | node->full_name); |
| 190 | of_node_put(node); |
Karthikeyan Mani | e398f18 | 2017-05-03 15:21:21 -0700 | [diff] [blame] | 191 | master->num_dev--; |
Banajit Goswami | de8271c | 2017-01-18 00:28:59 -0800 | [diff] [blame] | 192 | continue; |
| 193 | } |
Banajit Goswami | de8271c | 2017-01-18 00:28:59 -0800 | [diff] [blame] | 194 | } |
| 195 | return 0; |
| 196 | } |
| 197 | EXPORT_SYMBOL(of_register_swr_devices); |
| 198 | |
| 199 | /** |
| 200 | * swr_port_response - response from master to free the completed transaction |
| 201 | * @mstr: pointer to soundwire master device |
| 202 | * @tid: transaction id that indicates transaction to be freed. |
| 203 | * |
| 204 | * Master calls this function to free the compeleted transaction memory |
| 205 | */ |
| 206 | void swr_port_response(struct swr_master *mstr, u8 tid) |
| 207 | { |
| 208 | struct swr_params *txn; |
| 209 | |
| 210 | txn = mstr->port_txn[tid]; |
| 211 | |
| 212 | if (txn == NULL) { |
| 213 | dev_err(&mstr->dev, "%s: transaction is already NULL\n", |
| 214 | __func__); |
| 215 | return; |
| 216 | } |
| 217 | mstr->port_txn[tid] = NULL; |
| 218 | kfree(txn); |
| 219 | } |
| 220 | EXPORT_SYMBOL(swr_port_response); |
| 221 | |
| 222 | /** |
| 223 | * swr_remove_from_group - remove soundwire slave devices from group |
| 224 | * @dev: pointer to the soundwire slave device |
| 225 | * dev_num: device number of the soundwire slave device |
| 226 | * |
| 227 | * Returns error code for failure and 0 for success |
| 228 | */ |
| 229 | int swr_remove_from_group(struct swr_device *dev, u8 dev_num) |
| 230 | { |
| 231 | struct swr_master *master; |
| 232 | |
| 233 | if (!dev) |
| 234 | return -ENODEV; |
| 235 | |
| 236 | master = dev->master; |
| 237 | if (!master) |
| 238 | return -EINVAL; |
| 239 | |
| 240 | if (!dev->group_id) |
| 241 | return 0; |
| 242 | |
| 243 | if (master->gr_sid == dev_num) |
| 244 | return 0; |
| 245 | |
| 246 | if (master->remove_from_group && master->remove_from_group(master)) |
| 247 | dev_dbg(&master->dev, "%s: falling back to GROUP_NONE\n", |
| 248 | __func__); |
| 249 | |
| 250 | return 0; |
| 251 | } |
| 252 | EXPORT_SYMBOL(swr_remove_from_group); |
| 253 | |
| 254 | /** |
| 255 | * swr_slvdev_datapath_control - Enables/Disables soundwire slave device |
| 256 | * data path |
| 257 | * @dev: pointer to soundwire slave device |
| 258 | * @dev_num: device number of the soundwire slave device |
| 259 | * |
| 260 | * Returns error code for failure and 0 for success |
| 261 | */ |
| 262 | int swr_slvdev_datapath_control(struct swr_device *dev, u8 dev_num, |
| 263 | bool enable) |
| 264 | { |
| 265 | struct swr_master *master; |
| 266 | |
| 267 | if (!dev) |
| 268 | return -ENODEV; |
| 269 | |
| 270 | master = dev->master; |
| 271 | if (!master) |
| 272 | return -EINVAL; |
| 273 | |
| 274 | if (dev->group_id) { |
| 275 | /* Broadcast */ |
| 276 | if (master->gr_sid != dev_num) { |
| 277 | if (!master->gr_sid) |
| 278 | master->gr_sid = dev_num; |
| 279 | else |
| 280 | return 0; |
| 281 | } |
| 282 | } |
| 283 | |
| 284 | if (master->slvdev_datapath_control) |
| 285 | master->slvdev_datapath_control(master, enable); |
| 286 | |
| 287 | return 0; |
| 288 | } |
| 289 | EXPORT_SYMBOL(swr_slvdev_datapath_control); |
| 290 | |
| 291 | /** |
| 292 | * swr_connect_port - enable soundwire slave port(s) |
| 293 | * @dev: pointer to soundwire slave device |
| 294 | * @port_id: logical port id(s) of soundwire slave device |
| 295 | * @num_port: number of slave device ports need to be enabled |
| 296 | * @ch_mask: channels for each port that needs to be enabled |
| 297 | * @ch_rate: rate at which each port/channels operate |
| 298 | * @num_ch: number of channels for each port |
| 299 | * |
| 300 | * soundwire slave device call swr_connect_port API to enable all/some of |
| 301 | * its ports and corresponding channels and channel rate. This API will |
| 302 | * call master connect_port callback function to calculate frame structure |
| 303 | * and enable master and slave ports |
| 304 | */ |
| 305 | int swr_connect_port(struct swr_device *dev, u8 *port_id, u8 num_port, |
| 306 | u8 *ch_mask, u32 *ch_rate, u8 *num_ch) |
| 307 | { |
| 308 | u8 i = 0; |
| 309 | int ret = 0; |
| 310 | struct swr_params *txn = NULL; |
| 311 | struct swr_params **temp_txn = NULL; |
| 312 | struct swr_master *master = dev->master; |
| 313 | |
| 314 | if (!master) { |
| 315 | pr_err("%s: Master is NULL\n", __func__); |
| 316 | return -EINVAL; |
| 317 | } |
| 318 | if (num_port > SWR_MAX_DEV_PORT_NUM) { |
| 319 | dev_err(&master->dev, "%s: num_port %d exceeds max port %d\n", |
| 320 | __func__, num_port, SWR_MAX_DEV_PORT_NUM); |
| 321 | return -EINVAL; |
| 322 | } |
| 323 | |
| 324 | /* |
| 325 | * create "txn" to accommodate ports enablement of |
| 326 | * different slave devices calling swr_connect_port at the |
| 327 | * same time. Once master process the txn data, it calls |
| 328 | * swr_port_response() to free the transaction. Maximum |
| 329 | * of 256 transactions can be allocated. |
| 330 | */ |
| 331 | txn = kzalloc(sizeof(struct swr_params), GFP_KERNEL); |
| 332 | if (!txn) |
| 333 | return -ENOMEM; |
| 334 | |
| 335 | mutex_lock(&master->mlock); |
| 336 | for (i = 0; i < master->last_tid; i++) { |
| 337 | if (master->port_txn[i] == NULL) |
| 338 | break; |
| 339 | } |
| 340 | if (i >= master->last_tid) { |
| 341 | if (master->last_tid == 255) { |
| 342 | mutex_unlock(&master->mlock); |
| 343 | kfree(txn); |
| 344 | dev_err(&master->dev, "%s Max tid reached\n", |
| 345 | __func__); |
| 346 | return -ENOMEM; |
| 347 | } |
| 348 | temp_txn = krealloc(master->port_txn, |
| 349 | (i + 1) * sizeof(struct swr_params *), |
| 350 | GFP_KERNEL); |
| 351 | if (!temp_txn) { |
| 352 | mutex_unlock(&master->mlock); |
| 353 | kfree(txn); |
| 354 | dev_err(&master->dev, "%s Not able to allocate\n" |
| 355 | "master port transaction memory\n", |
| 356 | __func__); |
| 357 | return -ENOMEM; |
| 358 | } |
| 359 | master->port_txn = temp_txn; |
| 360 | master->last_tid++; |
| 361 | } |
| 362 | master->port_txn[i] = txn; |
| 363 | mutex_unlock(&master->mlock); |
| 364 | txn->tid = i; |
| 365 | |
| 366 | txn->dev_id = dev->dev_num; |
| 367 | txn->num_port = num_port; |
| 368 | for (i = 0; i < num_port; i++) { |
| 369 | txn->port_id[i] = port_id[i]; |
| 370 | txn->num_ch[i] = num_ch[i]; |
| 371 | txn->ch_rate[i] = ch_rate[i]; |
| 372 | txn->ch_en[i] = ch_mask[i]; |
| 373 | } |
| 374 | ret = master->connect_port(master, txn); |
| 375 | return ret; |
| 376 | } |
| 377 | EXPORT_SYMBOL(swr_connect_port); |
| 378 | |
| 379 | /** |
| 380 | * swr_disconnect_port - disable soundwire slave port(s) |
| 381 | * @dev: pointer to soundwire slave device |
| 382 | * @port_id: logical port id(s) of soundwire slave device |
| 383 | * @num_port: number of slave device ports need to be disabled |
| 384 | * |
| 385 | * soundwire slave device call swr_disconnect_port API to disable all/some of |
| 386 | * its ports. This API will call master disconnect_port callback function to |
| 387 | * disable master and slave port and (re)configure frame structure |
| 388 | */ |
| 389 | int swr_disconnect_port(struct swr_device *dev, u8 *port_id, u8 num_port) |
| 390 | { |
| 391 | u8 i = 0; |
| 392 | int ret; |
| 393 | struct swr_params *txn = NULL; |
| 394 | struct swr_params **temp_txn = NULL; |
| 395 | struct swr_master *master = dev->master; |
| 396 | |
| 397 | if (!master) { |
| 398 | pr_err("%s: Master is NULL\n", __func__); |
| 399 | return -EINVAL; |
| 400 | } |
| 401 | |
| 402 | if (num_port > SWR_MAX_DEV_PORT_NUM) { |
| 403 | dev_err(&master->dev, "%s: num_port %d exceeds max port %d\n", |
| 404 | __func__, num_port, SWR_MAX_DEV_PORT_NUM); |
| 405 | return -EINVAL; |
| 406 | } |
| 407 | |
| 408 | txn = kzalloc(sizeof(struct swr_params), GFP_KERNEL); |
| 409 | if (!txn) |
| 410 | return -ENOMEM; |
| 411 | |
| 412 | mutex_lock(&master->mlock); |
| 413 | for (i = 0; i < master->last_tid; i++) { |
| 414 | if (master->port_txn[i] == NULL) |
| 415 | break; |
| 416 | } |
| 417 | if (i >= master->last_tid) { |
| 418 | if (master->last_tid == 255) { |
| 419 | mutex_unlock(&master->mlock); |
| 420 | kfree(txn); |
| 421 | dev_err(&master->dev, "%s Max tid reached\n", |
| 422 | __func__); |
| 423 | return -ENOMEM; |
| 424 | } |
| 425 | temp_txn = krealloc(master->port_txn, |
| 426 | (i + 1) * sizeof(struct swr_params *), |
| 427 | GFP_KERNEL); |
| 428 | if (!temp_txn) { |
| 429 | mutex_unlock(&master->mlock); |
| 430 | kfree(txn); |
| 431 | dev_err(&master->dev, "%s Not able to allocate\n" |
| 432 | "master port transaction memory\n", |
| 433 | __func__); |
| 434 | return -ENOMEM; |
| 435 | } |
| 436 | master->port_txn = temp_txn; |
| 437 | master->last_tid++; |
| 438 | } |
| 439 | master->port_txn[i] = txn; |
| 440 | mutex_unlock(&master->mlock); |
| 441 | txn->tid = i; |
| 442 | |
| 443 | txn->dev_id = dev->dev_num; |
| 444 | txn->num_port = num_port; |
| 445 | for (i = 0; i < num_port; i++) |
| 446 | txn->port_id[i] = port_id[i]; |
| 447 | ret = master->disconnect_port(master, txn); |
| 448 | return ret; |
| 449 | } |
| 450 | EXPORT_SYMBOL(swr_disconnect_port); |
| 451 | |
| 452 | /** |
| 453 | * swr_get_logical_dev_num - Get soundwire slave logical device number |
| 454 | * @dev: pointer to soundwire slave device |
| 455 | * @dev_id: physical device id of soundwire slave device |
| 456 | * @dev_num: pointer to logical device num of soundwire slave device |
| 457 | * |
| 458 | * This API will get the logical device number of soundwire slave device |
| 459 | */ |
| 460 | int swr_get_logical_dev_num(struct swr_device *dev, u64 dev_id, |
| 461 | u8 *dev_num) |
| 462 | { |
| 463 | int ret = 0; |
| 464 | struct swr_master *master = dev->master; |
| 465 | |
| 466 | if (!master) { |
| 467 | pr_err("%s: Master is NULL\n", __func__); |
| 468 | return -EINVAL; |
| 469 | } |
| 470 | mutex_lock(&master->mlock); |
| 471 | ret = master->get_logical_dev_num(master, dev_id, dev_num); |
| 472 | if (ret) { |
| 473 | pr_err("%s: Error %d to get logical addr for device %llx\n", |
| 474 | __func__, ret, dev_id); |
| 475 | } |
| 476 | mutex_unlock(&master->mlock); |
| 477 | return ret; |
| 478 | } |
| 479 | EXPORT_SYMBOL(swr_get_logical_dev_num); |
| 480 | |
| 481 | /** |
| 482 | * swr_read - read soundwire slave device registers |
| 483 | * @dev: pointer to soundwire slave device |
| 484 | * @dev_num: logical device num of soundwire slave device |
| 485 | * @reg_addr: base register address that needs to be read |
| 486 | * @buf: pointer to store the values of registers from base address |
| 487 | * @len: length of the buffer |
| 488 | * |
| 489 | * This API will read the value of the register address from |
| 490 | * soundwire slave device |
| 491 | */ |
| 492 | int swr_read(struct swr_device *dev, u8 dev_num, u16 reg_addr, |
| 493 | void *buf, u32 len) |
| 494 | { |
| 495 | struct swr_master *master = dev->master; |
| 496 | |
| 497 | if (!master) |
| 498 | return -EINVAL; |
| 499 | return master->read(master, dev_num, reg_addr, buf, len); |
| 500 | } |
| 501 | EXPORT_SYMBOL(swr_read); |
| 502 | |
| 503 | /** |
| 504 | * swr_bulk_write - write soundwire slave device registers |
| 505 | * @dev: pointer to soundwire slave device |
| 506 | * @dev_num: logical device num of soundwire slave device |
| 507 | * @reg_addr: register address of soundwire slave device |
| 508 | * @buf: contains value of register address |
| 509 | * @len: indicates number of registers |
| 510 | * |
| 511 | * This API will write the value of the register address to |
| 512 | * soundwire slave device |
| 513 | */ |
| 514 | int swr_bulk_write(struct swr_device *dev, u8 dev_num, void *reg, |
| 515 | const void *buf, size_t len) |
| 516 | { |
| 517 | struct swr_master *master; |
| 518 | |
| 519 | if (!dev || !dev->master) |
| 520 | return -EINVAL; |
| 521 | |
| 522 | master = dev->master; |
| 523 | if (dev->group_id) { |
| 524 | if (master->gr_sid != dev_num) { |
| 525 | if (!master->gr_sid) |
| 526 | master->gr_sid = dev_num; |
| 527 | else |
| 528 | return 0; |
| 529 | } |
| 530 | dev_num = dev->group_id; |
| 531 | } |
| 532 | if (master->bulk_write) |
| 533 | return master->bulk_write(master, dev_num, reg, buf, len); |
| 534 | |
| 535 | return -EOPNOTSUPP; |
| 536 | } |
| 537 | EXPORT_SYMBOL(swr_bulk_write); |
| 538 | |
| 539 | /** |
| 540 | * swr_write - write soundwire slave device registers |
| 541 | * @dev: pointer to soundwire slave device |
| 542 | * @dev_num: logical device num of soundwire slave device |
| 543 | * @reg_addr: register address of soundwire slave device |
| 544 | * @buf: contains value of register address |
| 545 | * |
| 546 | * This API will write the value of the register address to |
| 547 | * soundwire slave device |
| 548 | */ |
| 549 | int swr_write(struct swr_device *dev, u8 dev_num, u16 reg_addr, |
| 550 | const void *buf) |
| 551 | { |
| 552 | struct swr_master *master = dev->master; |
| 553 | |
| 554 | if (!master) |
| 555 | return -EINVAL; |
| 556 | |
| 557 | if (dev->group_id) { |
| 558 | if (master->gr_sid != dev_num) { |
| 559 | if (!master->gr_sid) |
| 560 | master->gr_sid = dev_num; |
| 561 | else |
| 562 | return 0; |
| 563 | } |
| 564 | dev_num = dev->group_id; |
| 565 | } |
| 566 | return master->write(master, dev_num, reg_addr, buf); |
| 567 | } |
| 568 | EXPORT_SYMBOL(swr_write); |
| 569 | |
| 570 | /** |
| 571 | * swr_device_up - Function to bringup the soundwire slave device |
| 572 | * @swr_dev: pointer to soundwire slave device |
| 573 | * Context: can sleep |
| 574 | * |
| 575 | * This API will be called by soundwire master to bringup the slave |
| 576 | * device. |
| 577 | */ |
| 578 | int swr_device_up(struct swr_device *swr_dev) |
| 579 | { |
| 580 | struct device *dev; |
| 581 | const struct swr_driver *sdrv; |
| 582 | |
| 583 | if (!swr_dev) |
| 584 | return -EINVAL; |
| 585 | |
| 586 | dev = &swr_dev->dev; |
| 587 | sdrv = to_swr_driver(dev->driver); |
| 588 | if (!sdrv) |
Karthikeyan Mani | d52d579 | 2017-04-04 14:09:09 -0700 | [diff] [blame] | 589 | return 0; |
Banajit Goswami | de8271c | 2017-01-18 00:28:59 -0800 | [diff] [blame] | 590 | |
| 591 | if (sdrv->device_up) |
| 592 | return sdrv->device_up(to_swr_device(dev)); |
| 593 | |
| 594 | return -ENODEV; |
| 595 | } |
| 596 | EXPORT_SYMBOL(swr_device_up); |
| 597 | |
| 598 | /** |
| 599 | * swr_device_down - Function to call soundwire slave device down |
| 600 | * @swr_dev: pointer to soundwire slave device |
| 601 | * Context: can sleep |
| 602 | * |
| 603 | * This API will be called by soundwire master to put slave device in |
| 604 | * shutdown state. |
| 605 | */ |
| 606 | int swr_device_down(struct swr_device *swr_dev) |
| 607 | { |
| 608 | struct device *dev; |
| 609 | const struct swr_driver *sdrv; |
| 610 | |
| 611 | if (!swr_dev) |
| 612 | return -EINVAL; |
| 613 | |
| 614 | dev = &swr_dev->dev; |
| 615 | sdrv = to_swr_driver(dev->driver); |
| 616 | if (!sdrv) |
Karthikeyan Mani | d52d579 | 2017-04-04 14:09:09 -0700 | [diff] [blame] | 617 | return 0; |
Banajit Goswami | de8271c | 2017-01-18 00:28:59 -0800 | [diff] [blame] | 618 | |
| 619 | if (sdrv->device_down) |
| 620 | return sdrv->device_down(to_swr_device(dev)); |
| 621 | |
| 622 | return -ENODEV; |
| 623 | } |
| 624 | EXPORT_SYMBOL(swr_device_down); |
| 625 | |
| 626 | /** |
| 627 | * swr_reset_device - reset soundwire slave device |
| 628 | * @swr_dev: pointer to soundwire slave device |
| 629 | * Context: can sleep |
| 630 | * |
| 631 | * This API will be called by soundwire master to reset the slave |
| 632 | * device when the slave device is not responding or in undefined |
| 633 | * state |
| 634 | */ |
| 635 | int swr_reset_device(struct swr_device *swr_dev) |
| 636 | { |
| 637 | struct device *dev; |
| 638 | const struct swr_driver *sdrv; |
| 639 | |
| 640 | if (!swr_dev) |
| 641 | return -EINVAL; |
| 642 | |
| 643 | dev = &swr_dev->dev; |
| 644 | sdrv = to_swr_driver(dev->driver); |
| 645 | if (!sdrv) |
| 646 | return -EINVAL; |
| 647 | |
| 648 | if (sdrv->reset_device) |
| 649 | return sdrv->reset_device(to_swr_device(dev)); |
| 650 | |
| 651 | return -ENODEV; |
| 652 | } |
| 653 | EXPORT_SYMBOL(swr_reset_device); |
| 654 | |
| 655 | /** |
| 656 | * swr_set_device_group - Assign group id to the slave devices |
| 657 | * @swr_dev: pointer to soundwire slave device |
| 658 | * @id: group id to be assigned to slave device |
| 659 | * Context: can sleep |
| 660 | * |
| 661 | * This API will be called either from soundwire master or slave |
| 662 | * device to assign group id. |
| 663 | */ |
| 664 | int swr_set_device_group(struct swr_device *swr_dev, u8 id) |
| 665 | { |
| 666 | struct swr_master *master; |
| 667 | |
| 668 | if (!swr_dev) |
| 669 | return -EINVAL; |
| 670 | |
| 671 | swr_dev->group_id = id; |
| 672 | master = swr_dev->master; |
| 673 | if (!id && master) |
| 674 | master->gr_sid = 0; |
| 675 | |
| 676 | return 0; |
| 677 | } |
| 678 | EXPORT_SYMBOL(swr_set_device_group); |
| 679 | |
| 680 | static int swr_drv_probe(struct device *dev) |
| 681 | { |
| 682 | const struct swr_driver *sdrv = to_swr_driver(dev->driver); |
| 683 | |
| 684 | if (!sdrv) |
| 685 | return -EINVAL; |
| 686 | |
| 687 | if (sdrv->probe) |
| 688 | return sdrv->probe(to_swr_device(dev)); |
| 689 | return -ENODEV; |
| 690 | } |
| 691 | |
| 692 | static int swr_drv_remove(struct device *dev) |
| 693 | { |
| 694 | const struct swr_driver *sdrv = to_swr_driver(dev->driver); |
| 695 | |
| 696 | if (!sdrv) |
| 697 | return -EINVAL; |
| 698 | |
| 699 | if (sdrv->remove) |
| 700 | return sdrv->remove(to_swr_device(dev)); |
| 701 | return -ENODEV; |
| 702 | } |
| 703 | |
| 704 | static void swr_drv_shutdown(struct device *dev) |
| 705 | { |
| 706 | const struct swr_driver *sdrv = to_swr_driver(dev->driver); |
| 707 | |
| 708 | if (!sdrv) |
| 709 | return; |
| 710 | |
| 711 | if (sdrv->shutdown) |
| 712 | sdrv->shutdown(to_swr_device(dev)); |
| 713 | } |
| 714 | |
| 715 | /** |
| 716 | * swr_driver_register - register a soundwire driver |
| 717 | * @drv: the driver to register |
| 718 | * Context: can sleep |
| 719 | */ |
| 720 | int swr_driver_register(struct swr_driver *drv) |
| 721 | { |
| 722 | drv->driver.bus = &soundwire_type; |
| 723 | if (drv->probe) |
| 724 | drv->driver.probe = swr_drv_probe; |
| 725 | if (drv->remove) |
| 726 | drv->driver.remove = swr_drv_remove; |
| 727 | |
| 728 | if (drv->shutdown) |
| 729 | drv->driver.shutdown = swr_drv_shutdown; |
| 730 | |
| 731 | return driver_register(&drv->driver); |
| 732 | } |
| 733 | EXPORT_SYMBOL(swr_driver_register); |
| 734 | |
| 735 | /** |
| 736 | * swr_driver_unregister - unregister a soundwire driver |
| 737 | * @drv: the driver to unregister |
| 738 | */ |
| 739 | void swr_driver_unregister(struct swr_driver *drv) |
| 740 | { |
| 741 | if (drv) |
| 742 | driver_unregister(&drv->driver); |
| 743 | } |
| 744 | EXPORT_SYMBOL(swr_driver_unregister); |
| 745 | |
| 746 | static void swr_match_ctrl_to_boardinfo(struct swr_master *master, |
| 747 | struct swr_boardinfo *bi) |
| 748 | { |
| 749 | struct swr_device *swr; |
| 750 | |
| 751 | if (master->bus_num != bi->bus_num) { |
| 752 | dev_dbg(&master->dev, |
| 753 | "%s: master# %d and bi# %d does not match\n", |
| 754 | __func__, master->bus_num, bi->bus_num); |
| 755 | return; |
| 756 | } |
| 757 | |
| 758 | swr = swr_new_device(master, bi); |
| 759 | if (!swr) |
| 760 | dev_err(&master->dev, "can't create new device for %s\n", |
| 761 | bi->swr_slave->name); |
| 762 | } |
| 763 | |
| 764 | /** |
| 765 | * swr_master_add_boarddevices - Add devices registered by board info |
| 766 | * @master: master to which these devices are to be added to. |
| 767 | * |
| 768 | * This API is called by master when it is up and running. If devices |
| 769 | * on a master were registered before master, this will make sure that |
| 770 | * they get probed when master is up. |
| 771 | */ |
| 772 | void swr_master_add_boarddevices(struct swr_master *master) |
| 773 | { |
| 774 | struct boardinfo *bi; |
| 775 | |
| 776 | mutex_lock(&board_lock); |
| 777 | list_add_tail(&master->list, &swr_master_list); |
| 778 | list_for_each_entry(bi, &board_list, list) |
| 779 | swr_match_ctrl_to_boardinfo(master, &bi->board_info); |
| 780 | mutex_unlock(&board_lock); |
| 781 | } |
| 782 | EXPORT_SYMBOL(swr_master_add_boarddevices); |
| 783 | |
| 784 | static void swr_unregister_device(struct swr_device *swr) |
| 785 | { |
| 786 | if (swr) |
| 787 | device_unregister(&swr->dev); |
| 788 | } |
| 789 | |
| 790 | static void swr_master_release(struct device *dev) |
| 791 | { |
| 792 | struct swr_master *master = to_swr_master(dev); |
| 793 | |
| 794 | kfree(master); |
| 795 | } |
| 796 | |
| 797 | #define swr_master_attr_gr NULL |
| 798 | static struct device_type swr_master_type = { |
| 799 | .groups = swr_master_attr_gr, |
| 800 | .release = swr_master_release, |
| 801 | }; |
| 802 | |
| 803 | static int __unregister(struct device *dev, void *null) |
| 804 | { |
| 805 | swr_unregister_device(to_swr_device(dev)); |
| 806 | return 0; |
| 807 | } |
| 808 | |
| 809 | /** |
| 810 | * swr_unregister_master - unregister soundwire master controller |
| 811 | * @master: the master being unregistered |
| 812 | * |
| 813 | * This API is called by master controller driver to unregister |
| 814 | * master controller that was registered by swr_register_master API. |
| 815 | */ |
| 816 | void swr_unregister_master(struct swr_master *master) |
| 817 | { |
| 818 | int dummy; |
| 819 | struct swr_master *m_ctrl; |
| 820 | |
| 821 | mutex_lock(&swr_lock); |
| 822 | m_ctrl = idr_find(&master_idr, master->bus_num); |
| 823 | mutex_unlock(&swr_lock); |
| 824 | if (m_ctrl != master) |
| 825 | return; |
| 826 | |
| 827 | mutex_lock(&board_lock); |
| 828 | list_del(&master->list); |
| 829 | mutex_unlock(&board_lock); |
| 830 | |
| 831 | /* free bus id */ |
| 832 | mutex_lock(&swr_lock); |
| 833 | idr_remove(&master_idr, master->bus_num); |
| 834 | mutex_unlock(&swr_lock); |
| 835 | |
| 836 | dummy = device_for_each_child(&master->dev, NULL, __unregister); |
| 837 | device_unregister(&master->dev); |
| 838 | } |
| 839 | EXPORT_SYMBOL(swr_unregister_master); |
| 840 | |
| 841 | /** |
| 842 | * swr_register_master - register soundwire master controller |
| 843 | * @master: master to be registered |
| 844 | * |
| 845 | * This API will register master with the framework. master->bus_num |
| 846 | * is the desired number with which soundwire framework registers the |
| 847 | * master. |
| 848 | */ |
| 849 | int swr_register_master(struct swr_master *master) |
| 850 | { |
| 851 | int id; |
| 852 | int status = 0; |
| 853 | |
| 854 | mutex_lock(&swr_lock); |
| 855 | id = idr_alloc(&master_idr, master, master->bus_num, |
| 856 | master->bus_num+1, GFP_KERNEL); |
| 857 | mutex_unlock(&swr_lock); |
| 858 | if (id < 0) |
| 859 | return id; |
| 860 | master->bus_num = id; |
| 861 | |
| 862 | /* Can't register until driver model init */ |
| 863 | if (WARN_ON(!soundwire_type.p)) { |
| 864 | status = -EAGAIN; |
| 865 | goto done; |
| 866 | } |
| 867 | |
| 868 | dev_set_name(&master->dev, "swr%u", master->bus_num); |
| 869 | master->dev.bus = &soundwire_type; |
| 870 | master->dev.type = &swr_master_type; |
| 871 | mutex_init(&master->mlock); |
| 872 | status = device_register(&master->dev); |
| 873 | if (status < 0) |
| 874 | goto done; |
| 875 | |
| 876 | INIT_LIST_HEAD(&master->devices); |
| 877 | pr_debug("%s: SWR master registered successfully %s\n", |
| 878 | __func__, dev_name(&master->dev)); |
| 879 | return 0; |
| 880 | |
| 881 | done: |
| 882 | idr_remove(&master_idr, master->bus_num); |
| 883 | return status; |
| 884 | } |
| 885 | EXPORT_SYMBOL(swr_register_master); |
| 886 | |
| 887 | #define swr_device_attr_gr NULL |
| 888 | #define swr_device_uevent NULL |
| 889 | static struct device_type swr_dev_type = { |
| 890 | .groups = swr_device_attr_gr, |
| 891 | .uevent = swr_device_uevent, |
| 892 | .release = swr_dev_release, |
| 893 | }; |
| 894 | |
| 895 | static const struct swr_device_id *swr_match(const struct swr_device_id *id, |
| 896 | const struct swr_device *swr_dev) |
| 897 | { |
| 898 | while (id->name[0]) { |
| 899 | if (strcmp(swr_dev->name, id->name) == 0) |
| 900 | return id; |
| 901 | id++; |
| 902 | } |
| 903 | return NULL; |
| 904 | } |
| 905 | |
| 906 | static int swr_device_match(struct device *dev, struct device_driver *driver) |
| 907 | { |
| 908 | struct swr_device *swr_dev; |
| 909 | struct swr_driver *drv = to_swr_driver(driver); |
| 910 | |
| 911 | if (!drv) |
| 912 | return -EINVAL; |
| 913 | |
| 914 | if (dev->type == &swr_dev_type) |
| 915 | swr_dev = to_swr_device(dev); |
| 916 | else |
| 917 | return 0; |
| 918 | if (drv->id_table) |
| 919 | return swr_match(drv->id_table, swr_dev) != NULL; |
| 920 | |
| 921 | if (driver->name) |
| 922 | return strcmp(swr_dev->name, driver->name) == 0; |
| 923 | return 0; |
| 924 | } |
| 925 | #ifdef CONFIG_PM_SLEEP |
| 926 | static int swr_legacy_suspend(struct device *dev, pm_message_t mesg) |
| 927 | { |
| 928 | struct swr_device *swr_dev = NULL; |
| 929 | struct swr_driver *driver; |
| 930 | |
| 931 | if (dev->type == &swr_dev_type) |
| 932 | swr_dev = to_swr_device(dev); |
| 933 | |
| 934 | if (!swr_dev || !dev->driver) |
| 935 | return 0; |
| 936 | |
| 937 | driver = to_swr_driver(dev->driver); |
| 938 | if (!driver->suspend) |
| 939 | return 0; |
| 940 | |
| 941 | return driver->suspend(swr_dev, mesg); |
| 942 | } |
| 943 | |
| 944 | static int swr_legacy_resume(struct device *dev) |
| 945 | { |
| 946 | struct swr_device *swr_dev = NULL; |
| 947 | struct swr_driver *driver; |
| 948 | |
| 949 | if (dev->type == &swr_dev_type) |
| 950 | swr_dev = to_swr_device(dev); |
| 951 | |
| 952 | if (!swr_dev || !dev->driver) |
| 953 | return 0; |
| 954 | |
| 955 | driver = to_swr_driver(dev->driver); |
| 956 | if (!driver->resume) |
| 957 | return 0; |
| 958 | |
| 959 | return driver->resume(swr_dev); |
| 960 | } |
| 961 | |
| 962 | static int swr_pm_suspend(struct device *dev) |
| 963 | { |
| 964 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
| 965 | |
| 966 | if (pm) |
| 967 | return pm_generic_suspend(dev); |
| 968 | else |
| 969 | return swr_legacy_suspend(dev, PMSG_SUSPEND); |
| 970 | } |
| 971 | |
| 972 | static int swr_pm_resume(struct device *dev) |
| 973 | { |
| 974 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
| 975 | |
| 976 | if (pm) |
| 977 | return pm_generic_resume(dev); |
| 978 | else |
| 979 | return swr_legacy_resume(dev); |
| 980 | } |
| 981 | #else |
| 982 | #define swr_pm_suspend NULL |
| 983 | #define swr_pm_resume NULL |
| 984 | #endif /*CONFIG_PM_SLEEP*/ |
| 985 | |
| 986 | static const struct dev_pm_ops soundwire_pm = { |
| 987 | .suspend = swr_pm_suspend, |
| 988 | .resume = swr_pm_resume, |
| 989 | SET_RUNTIME_PM_OPS( |
| 990 | pm_generic_suspend, |
| 991 | pm_generic_resume, |
| 992 | NULL |
| 993 | ) |
| 994 | }; |
| 995 | |
| 996 | struct device soundwire_dev = { |
| 997 | .init_name = "soundwire", |
| 998 | }; |
| 999 | |
| 1000 | struct bus_type soundwire_type = { |
| 1001 | .name = "soundwire", |
| 1002 | .match = swr_device_match, |
| 1003 | .pm = &soundwire_pm, |
| 1004 | }; |
| 1005 | EXPORT_SYMBOL(soundwire_type); |
| 1006 | |
| 1007 | static void __exit soundwire_exit(void) |
| 1008 | { |
| 1009 | device_unregister(&soundwire_dev); |
| 1010 | bus_unregister(&soundwire_type); |
| 1011 | } |
| 1012 | |
| 1013 | static int __init soundwire_init(void) |
| 1014 | { |
| 1015 | int retval; |
| 1016 | |
| 1017 | retval = bus_register(&soundwire_type); |
| 1018 | if (!retval) |
| 1019 | retval = device_register(&soundwire_dev); |
| 1020 | |
| 1021 | if (retval) |
| 1022 | bus_unregister(&soundwire_type); |
| 1023 | |
| 1024 | return retval; |
| 1025 | } |
| 1026 | postcore_initcall(soundwire_init); |
| 1027 | module_exit(soundwire_exit); |
| 1028 | |
| 1029 | |
| 1030 | MODULE_LICENSE("GPL v2"); |
| 1031 | MODULE_DESCRIPTION("Soundwire module"); |
| 1032 | MODULE_ALIAS("platform:soundwire"); |