Banajit Goswami | de8271c | 2017-01-18 00:28:59 -0800 | [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 | #include <linux/init.h> |
| 14 | #include <linux/kernel.h> |
| 15 | #include <linux/module.h> |
| 16 | #include <linux/mutex.h> |
| 17 | #include <linux/errno.h> |
| 18 | #include <linux/fs.h> |
| 19 | #include <linux/uaccess.h> |
| 20 | #include <linux/slab.h> |
| 21 | #include <linux/list.h> |
| 22 | #include <linux/cdev.h> |
| 23 | #include <linux/platform_device.h> |
| 24 | #include <soc/qcom/glink.h> |
| 25 | #include "sound/wcd-dsp-glink.h" |
| 26 | |
| 27 | #define WDSP_GLINK_DRIVER_NAME "wcd-dsp-glink" |
| 28 | #define WDSP_MAX_WRITE_SIZE (512 * 1024) |
| 29 | #define WDSP_MAX_READ_SIZE (4 * 1024) |
| 30 | |
| 31 | #define MINOR_NUMBER_COUNT 1 |
| 32 | #define WDSP_EDGE "wdsp" |
| 33 | #define RESP_QUEUE_SIZE 3 |
| 34 | #define QOS_PKT_SIZE 1024 |
| 35 | #define TIMEOUT_MS 1000 |
| 36 | |
| 37 | struct wdsp_glink_dev { |
| 38 | struct class *cls; |
| 39 | struct device *dev; |
| 40 | struct cdev cdev; |
| 41 | dev_t dev_num; |
| 42 | }; |
| 43 | |
| 44 | struct wdsp_glink_rsp_que { |
| 45 | /* Size of valid data in buffer */ |
| 46 | u32 buf_size; |
| 47 | |
| 48 | /* Response buffer */ |
| 49 | u8 buf[WDSP_MAX_READ_SIZE]; |
| 50 | }; |
| 51 | |
| 52 | struct wdsp_glink_tx_buf { |
| 53 | struct work_struct tx_work; |
| 54 | |
| 55 | /* Glink channel information */ |
| 56 | struct wdsp_glink_ch *ch; |
| 57 | |
| 58 | /* Tx buffer to send to glink */ |
| 59 | u8 buf[0]; |
| 60 | }; |
| 61 | |
| 62 | struct wdsp_glink_ch { |
| 63 | struct wdsp_glink_priv *wpriv; |
| 64 | |
| 65 | /* Glink channel handle */ |
| 66 | void *handle; |
| 67 | |
| 68 | /* Channel states like connect, disconnect */ |
| 69 | int channel_state; |
| 70 | struct mutex mutex; |
| 71 | |
| 72 | /* To free up the channel memory */ |
| 73 | bool free_mem; |
| 74 | |
| 75 | /* Glink local channel open work */ |
| 76 | struct work_struct lcl_ch_open_wrk; |
| 77 | |
| 78 | /* Glink local channel close work */ |
| 79 | struct work_struct lcl_ch_cls_wrk; |
| 80 | |
| 81 | /* Wait for ch connect state before sending any command */ |
| 82 | wait_queue_head_t ch_connect_wait; |
| 83 | |
| 84 | /* |
| 85 | * Glink channel configuration. This has to be the last |
| 86 | * member of the strucuture as it has variable size |
| 87 | */ |
| 88 | struct wdsp_glink_ch_cfg ch_cfg; |
| 89 | }; |
| 90 | |
| 91 | struct wdsp_glink_state { |
| 92 | /* Glink link state information */ |
| 93 | enum glink_link_state link_state; |
| 94 | void *handle; |
| 95 | }; |
| 96 | |
| 97 | struct wdsp_glink_priv { |
| 98 | /* Respone buffer related */ |
| 99 | u8 rsp_cnt; |
| 100 | struct wdsp_glink_rsp_que rsp[RESP_QUEUE_SIZE]; |
| 101 | struct completion rsp_complete; |
| 102 | struct mutex rsp_mutex; |
| 103 | |
| 104 | /* Glink channel related */ |
| 105 | struct mutex glink_mutex; |
| 106 | struct wdsp_glink_state glink_state; |
| 107 | struct wdsp_glink_ch **ch; |
| 108 | u8 no_of_channels; |
| 109 | struct work_struct ch_open_cls_wrk; |
| 110 | struct workqueue_struct *work_queue; |
| 111 | |
| 112 | wait_queue_head_t link_state_wait; |
| 113 | |
| 114 | struct device *dev; |
| 115 | }; |
| 116 | |
| 117 | static int wdsp_glink_close_ch(struct wdsp_glink_ch *ch); |
| 118 | static int wdsp_glink_open_ch(struct wdsp_glink_ch *ch); |
| 119 | |
| 120 | /* |
| 121 | * wdsp_glink_notify_rx - Glink notify rx callback for responses |
| 122 | * handle: Opaque Channel handle returned by GLink |
| 123 | * priv: Private pointer to the channel |
| 124 | * pkt_priv: Private pointer to the packet |
| 125 | * ptr: Pointer to the Rx data |
| 126 | * size: Size of the Rx data |
| 127 | */ |
| 128 | static void wdsp_glink_notify_rx(void *handle, const void *priv, |
| 129 | const void *pkt_priv, const void *ptr, |
| 130 | size_t size) |
| 131 | { |
| 132 | u8 *rx_buf; |
| 133 | u8 rsp_cnt; |
| 134 | struct wdsp_glink_ch *ch; |
| 135 | struct wdsp_glink_priv *wpriv; |
| 136 | |
| 137 | if (!ptr || !priv) { |
| 138 | pr_err("%s: Invalid parameters\n", __func__); |
| 139 | return; |
| 140 | } |
| 141 | |
| 142 | ch = (struct wdsp_glink_ch *)priv; |
| 143 | wpriv = ch->wpriv; |
| 144 | rx_buf = (u8 *)ptr; |
| 145 | if (size > WDSP_MAX_READ_SIZE) { |
| 146 | dev_err(wpriv->dev, "%s: Size %zd is greater than allowed %d\n", |
| 147 | __func__, size, WDSP_MAX_READ_SIZE); |
| 148 | size = WDSP_MAX_READ_SIZE; |
| 149 | } |
| 150 | |
| 151 | mutex_lock(&wpriv->rsp_mutex); |
| 152 | rsp_cnt = wpriv->rsp_cnt; |
| 153 | if (rsp_cnt >= RESP_QUEUE_SIZE) { |
| 154 | dev_err(wpriv->dev, "%s: Resp Queue is Full\n", __func__); |
| 155 | rsp_cnt = 0; |
| 156 | } |
| 157 | dev_dbg(wpriv->dev, "%s: copy into buffer %d\n", __func__, rsp_cnt); |
| 158 | |
| 159 | memcpy(wpriv->rsp[rsp_cnt].buf, rx_buf, size); |
| 160 | wpriv->rsp[rsp_cnt].buf_size = size; |
| 161 | wpriv->rsp_cnt = ++rsp_cnt; |
| 162 | mutex_unlock(&wpriv->rsp_mutex); |
| 163 | |
| 164 | glink_rx_done(handle, ptr, true); |
| 165 | complete(&wpriv->rsp_complete); |
| 166 | } |
| 167 | |
| 168 | /* |
| 169 | * wdsp_glink_notify_tx_done - Glink notify tx done callback to |
| 170 | * free tx buffer |
| 171 | * handle: Opaque Channel handle returned by GLink |
| 172 | * priv: Private pointer to the channel |
| 173 | * pkt_priv: Private pointer to the packet |
| 174 | * ptr: Pointer to the Tx data |
| 175 | */ |
| 176 | static void wdsp_glink_notify_tx_done(void *handle, const void *priv, |
| 177 | const void *pkt_priv, const void *ptr) |
| 178 | { |
| 179 | if (!pkt_priv) { |
| 180 | pr_err("%s: Invalid parameter\n", __func__); |
| 181 | return; |
| 182 | } |
| 183 | /* Free tx pkt */ |
| 184 | kfree(pkt_priv); |
| 185 | } |
| 186 | |
| 187 | /* |
| 188 | * wdsp_glink_notify_tx_abort - Glink notify tx abort callback to |
| 189 | * free tx buffer |
| 190 | * handle: Opaque Channel handle returned by GLink |
| 191 | * priv: Private pointer to the channel |
| 192 | * pkt_priv: Private pointer to the packet |
| 193 | */ |
| 194 | static void wdsp_glink_notify_tx_abort(void *handle, const void *priv, |
| 195 | const void *pkt_priv) |
| 196 | { |
| 197 | if (!pkt_priv) { |
| 198 | pr_err("%s: Invalid parameter\n", __func__); |
| 199 | return; |
| 200 | } |
| 201 | /* Free tx pkt */ |
| 202 | kfree(pkt_priv); |
| 203 | } |
| 204 | |
| 205 | /* |
| 206 | * wdsp_glink_notify_rx_intent_req - Glink notify rx intent request callback |
| 207 | * to queue buffer to receive from remote client |
| 208 | * handle: Opaque channel handle returned by GLink |
| 209 | * priv: Private pointer to the channel |
| 210 | * req_size: Size of intent to be queued |
| 211 | */ |
| 212 | static bool wdsp_glink_notify_rx_intent_req(void *handle, const void *priv, |
| 213 | size_t req_size) |
| 214 | { |
| 215 | struct wdsp_glink_priv *wpriv; |
| 216 | struct wdsp_glink_ch *ch; |
| 217 | int rc = 0; |
| 218 | bool ret = false; |
| 219 | |
| 220 | if (!priv) { |
| 221 | pr_err("%s: Invalid priv\n", __func__); |
| 222 | goto done; |
| 223 | } |
| 224 | if (req_size > WDSP_MAX_READ_SIZE) { |
| 225 | pr_err("%s: Invalid req_size %zd\n", __func__, req_size); |
| 226 | goto done; |
| 227 | } |
| 228 | |
| 229 | ch = (struct wdsp_glink_ch *)priv; |
| 230 | wpriv = ch->wpriv; |
| 231 | |
| 232 | dev_dbg(wpriv->dev, "%s: intent size %zd requested for ch name %s", |
| 233 | __func__, req_size, ch->ch_cfg.name); |
| 234 | |
| 235 | mutex_lock(&ch->mutex); |
| 236 | rc = glink_queue_rx_intent(ch->handle, ch, req_size); |
| 237 | if (IS_ERR_VALUE(rc)) { |
| 238 | dev_err(wpriv->dev, "%s: Failed to queue rx intent, rc = %d\n", |
| 239 | __func__, rc); |
| 240 | mutex_unlock(&ch->mutex); |
| 241 | goto done; |
| 242 | } |
| 243 | mutex_unlock(&ch->mutex); |
| 244 | ret = true; |
| 245 | |
| 246 | done: |
| 247 | return ret; |
| 248 | } |
| 249 | |
| 250 | /* |
| 251 | * wdsp_glink_lcl_ch_open_wrk - Work function to open channel again |
| 252 | * when local disconnect event happens |
| 253 | * work: Work structure |
| 254 | */ |
| 255 | static void wdsp_glink_lcl_ch_open_wrk(struct work_struct *work) |
| 256 | { |
| 257 | struct wdsp_glink_ch *ch; |
| 258 | |
| 259 | ch = container_of(work, struct wdsp_glink_ch, |
| 260 | lcl_ch_open_wrk); |
| 261 | |
| 262 | wdsp_glink_open_ch(ch); |
| 263 | } |
| 264 | |
| 265 | /* |
| 266 | * wdsp_glink_lcl_ch_cls_wrk - Work function to close channel locally |
| 267 | * when remote disconnect event happens |
| 268 | * work: Work structure |
| 269 | */ |
| 270 | static void wdsp_glink_lcl_ch_cls_wrk(struct work_struct *work) |
| 271 | { |
| 272 | struct wdsp_glink_ch *ch; |
| 273 | |
| 274 | ch = container_of(work, struct wdsp_glink_ch, |
| 275 | lcl_ch_cls_wrk); |
| 276 | |
| 277 | wdsp_glink_close_ch(ch); |
| 278 | } |
| 279 | |
| 280 | /* |
| 281 | * wdsp_glink_notify_state - Glink channel state information event callback |
| 282 | * handle: Opaque Channel handle returned by GLink |
| 283 | * priv: Private pointer to the channel |
| 284 | * event: channel state event |
| 285 | */ |
| 286 | static void wdsp_glink_notify_state(void *handle, const void *priv, |
| 287 | unsigned int event) |
| 288 | { |
| 289 | struct wdsp_glink_priv *wpriv; |
| 290 | struct wdsp_glink_ch *ch; |
| 291 | int i, ret = 0; |
| 292 | |
| 293 | if (!priv) { |
| 294 | pr_err("%s: Invalid priv\n", __func__); |
| 295 | return; |
| 296 | } |
| 297 | |
| 298 | ch = (struct wdsp_glink_ch *)priv; |
| 299 | wpriv = ch->wpriv; |
| 300 | |
| 301 | mutex_lock(&ch->mutex); |
| 302 | ch->channel_state = event; |
| 303 | if (event == GLINK_CONNECTED) { |
| 304 | dev_dbg(wpriv->dev, "%s: glink channel: %s connected\n", |
| 305 | __func__, ch->ch_cfg.name); |
| 306 | |
| 307 | for (i = 0; i < ch->ch_cfg.no_of_intents; i++) { |
| 308 | dev_dbg(wpriv->dev, "%s: intent_size = %d\n", __func__, |
| 309 | ch->ch_cfg.intents_size[i]); |
| 310 | ret = glink_queue_rx_intent(ch->handle, ch, |
| 311 | ch->ch_cfg.intents_size[i]); |
| 312 | if (IS_ERR_VALUE(ret)) |
| 313 | dev_warn(wpriv->dev, "%s: Failed to queue intent %d of size %d\n", |
| 314 | __func__, i, |
| 315 | ch->ch_cfg.intents_size[i]); |
| 316 | } |
| 317 | |
| 318 | ret = glink_qos_latency(ch->handle, ch->ch_cfg.latency_in_us, |
| 319 | QOS_PKT_SIZE); |
| 320 | if (IS_ERR_VALUE(ret)) |
| 321 | dev_warn(wpriv->dev, "%s: Failed to request qos %d for ch %s\n", |
| 322 | __func__, ch->ch_cfg.latency_in_us, |
| 323 | ch->ch_cfg.name); |
| 324 | |
| 325 | wake_up(&ch->ch_connect_wait); |
| 326 | mutex_unlock(&ch->mutex); |
| 327 | } else if (event == GLINK_LOCAL_DISCONNECTED) { |
| 328 | /* |
| 329 | * Don't use dev_dbg here as dev may not be valid if channel |
| 330 | * closed from driver close. |
| 331 | */ |
| 332 | pr_debug("%s: channel: %s disconnected locally\n", |
| 333 | __func__, ch->ch_cfg.name); |
| 334 | mutex_unlock(&ch->mutex); |
| 335 | |
| 336 | if (ch->free_mem) { |
| 337 | kfree(ch); |
| 338 | ch = NULL; |
| 339 | } |
| 340 | } else if (event == GLINK_REMOTE_DISCONNECTED) { |
| 341 | dev_dbg(wpriv->dev, "%s: remote channel: %s disconnected remotely\n", |
| 342 | __func__, ch->ch_cfg.name); |
| 343 | mutex_unlock(&ch->mutex); |
| 344 | /* |
| 345 | * If remote disconnect happens, local side also has |
| 346 | * to close the channel as per glink design in a |
| 347 | * separate work_queue. |
| 348 | */ |
| 349 | queue_work(wpriv->work_queue, &ch->lcl_ch_cls_wrk); |
| 350 | } |
| 351 | } |
| 352 | |
| 353 | /* |
| 354 | * wdsp_glink_close_ch - Internal function to close glink channel |
| 355 | * ch: Glink Channel structure. |
| 356 | */ |
| 357 | static int wdsp_glink_close_ch(struct wdsp_glink_ch *ch) |
| 358 | { |
| 359 | struct wdsp_glink_priv *wpriv = ch->wpriv; |
| 360 | int ret = 0; |
| 361 | |
| 362 | mutex_lock(&wpriv->glink_mutex); |
| 363 | if (ch->handle) { |
| 364 | ret = glink_close(ch->handle); |
| 365 | if (IS_ERR_VALUE(ret)) { |
| 366 | dev_err(wpriv->dev, "%s: glink_close is failed, ret = %d\n", |
| 367 | __func__, ret); |
| 368 | } else { |
| 369 | ch->handle = NULL; |
| 370 | dev_dbg(wpriv->dev, "%s: ch %s is closed\n", __func__, |
| 371 | ch->ch_cfg.name); |
| 372 | } |
| 373 | } else { |
| 374 | dev_dbg(wpriv->dev, "%s: ch %s is already closed\n", __func__, |
| 375 | ch->ch_cfg.name); |
| 376 | } |
| 377 | mutex_unlock(&wpriv->glink_mutex); |
| 378 | |
| 379 | |
| 380 | return ret; |
| 381 | } |
| 382 | |
| 383 | /* |
| 384 | * wdsp_glink_open_ch - Internal function to open glink channel |
| 385 | * ch: Glink Channel structure. |
| 386 | */ |
| 387 | static int wdsp_glink_open_ch(struct wdsp_glink_ch *ch) |
| 388 | { |
| 389 | struct wdsp_glink_priv *wpriv = ch->wpriv; |
| 390 | struct glink_open_config open_cfg; |
| 391 | int ret = 0; |
| 392 | |
| 393 | mutex_lock(&wpriv->glink_mutex); |
| 394 | if (!ch->handle) { |
| 395 | memset(&open_cfg, 0, sizeof(open_cfg)); |
| 396 | open_cfg.options = GLINK_OPT_INITIAL_XPORT; |
| 397 | open_cfg.edge = WDSP_EDGE; |
| 398 | open_cfg.notify_rx = wdsp_glink_notify_rx; |
| 399 | open_cfg.notify_tx_done = wdsp_glink_notify_tx_done; |
| 400 | open_cfg.notify_tx_abort = wdsp_glink_notify_tx_abort; |
| 401 | open_cfg.notify_state = wdsp_glink_notify_state; |
| 402 | open_cfg.notify_rx_intent_req = wdsp_glink_notify_rx_intent_req; |
| 403 | open_cfg.priv = ch; |
| 404 | open_cfg.name = ch->ch_cfg.name; |
| 405 | |
| 406 | dev_dbg(wpriv->dev, "%s: ch->ch_cfg.name = %s, latency_in_us = %d, intents = %d\n", |
| 407 | __func__, ch->ch_cfg.name, ch->ch_cfg.latency_in_us, |
| 408 | ch->ch_cfg.no_of_intents); |
| 409 | |
| 410 | ch->handle = glink_open(&open_cfg); |
| 411 | if (IS_ERR_OR_NULL(ch->handle)) { |
| 412 | dev_err(wpriv->dev, "%s: glink_open failed for ch %s\n", |
| 413 | __func__, ch->ch_cfg.name); |
| 414 | ch->handle = NULL; |
| 415 | ret = -EINVAL; |
| 416 | } |
| 417 | } else { |
| 418 | dev_err(wpriv->dev, "%s: ch %s is already opened\n", __func__, |
| 419 | ch->ch_cfg.name); |
| 420 | } |
| 421 | mutex_unlock(&wpriv->glink_mutex); |
| 422 | |
| 423 | return ret; |
| 424 | } |
| 425 | |
| 426 | /* |
| 427 | * wdsp_glink_close_all_ch - Internal function to close all glink channels |
| 428 | * wpriv: Wdsp_glink private structure |
| 429 | */ |
| 430 | static void wdsp_glink_close_all_ch(struct wdsp_glink_priv *wpriv) |
| 431 | { |
| 432 | int i; |
| 433 | |
| 434 | for (i = 0; i < wpriv->no_of_channels; i++) |
| 435 | if (wpriv->ch && wpriv->ch[i]) |
| 436 | wdsp_glink_close_ch(wpriv->ch[i]); |
| 437 | } |
| 438 | |
| 439 | /* |
| 440 | * wdsp_glink_open_all_ch - Internal function to open all glink channels |
| 441 | * wpriv: Wdsp_glink private structure |
| 442 | */ |
| 443 | static int wdsp_glink_open_all_ch(struct wdsp_glink_priv *wpriv) |
| 444 | { |
| 445 | int ret = 0, i, j; |
| 446 | |
| 447 | for (i = 0; i < wpriv->no_of_channels; i++) { |
| 448 | if (wpriv->ch && wpriv->ch[i]) { |
| 449 | ret = wdsp_glink_open_ch(wpriv->ch[i]); |
| 450 | if (IS_ERR_VALUE(ret)) |
| 451 | goto err_open; |
| 452 | } |
| 453 | } |
| 454 | goto done; |
| 455 | |
| 456 | err_open: |
| 457 | for (j = 0; j < i; j++) |
| 458 | if (wpriv->ch[i]) |
| 459 | wdsp_glink_close_ch(wpriv->ch[j]); |
| 460 | |
| 461 | done: |
| 462 | return ret; |
| 463 | } |
| 464 | |
| 465 | /* |
| 466 | * wdsp_glink_ch_open_wq - Work function to open glink channels |
| 467 | * work: Work structure |
| 468 | */ |
| 469 | static void wdsp_glink_ch_open_cls_wrk(struct work_struct *work) |
| 470 | { |
| 471 | struct wdsp_glink_priv *wpriv; |
| 472 | |
| 473 | wpriv = container_of(work, struct wdsp_glink_priv, |
| 474 | ch_open_cls_wrk); |
| 475 | |
| 476 | if (wpriv->glink_state.link_state == GLINK_LINK_STATE_DOWN) { |
| 477 | dev_info(wpriv->dev, "%s: GLINK_LINK_STATE_DOWN\n", |
| 478 | __func__); |
| 479 | |
| 480 | wdsp_glink_close_all_ch(wpriv); |
| 481 | } else if (wpriv->glink_state.link_state == GLINK_LINK_STATE_UP) { |
| 482 | dev_info(wpriv->dev, "%s: GLINK_LINK_STATE_UP\n", |
| 483 | __func__); |
| 484 | |
| 485 | wdsp_glink_open_all_ch(wpriv); |
| 486 | } |
| 487 | } |
| 488 | |
| 489 | /* |
| 490 | * wdsp_glink_link_state_cb - Glink link state callback to inform |
| 491 | * about link states |
| 492 | * cb_info: Glink link state callback information structure |
| 493 | * priv: Private structure of link state passed while register |
| 494 | */ |
| 495 | static void wdsp_glink_link_state_cb(struct glink_link_state_cb_info *cb_info, |
| 496 | void *priv) |
| 497 | { |
| 498 | struct wdsp_glink_priv *wpriv; |
| 499 | |
| 500 | if (!cb_info || !priv) { |
| 501 | pr_err("%s: Invalid parameters\n", __func__); |
| 502 | return; |
| 503 | } |
| 504 | |
| 505 | wpriv = (struct wdsp_glink_priv *)priv; |
| 506 | |
| 507 | mutex_lock(&wpriv->glink_mutex); |
| 508 | wpriv->glink_state.link_state = cb_info->link_state; |
| 509 | wake_up(&wpriv->link_state_wait); |
| 510 | mutex_unlock(&wpriv->glink_mutex); |
| 511 | |
| 512 | queue_work(wpriv->work_queue, &wpriv->ch_open_cls_wrk); |
| 513 | } |
| 514 | |
| 515 | /* |
| 516 | * wdsp_glink_ch_info_init- Internal function to allocate channel memory |
| 517 | * and register with glink |
| 518 | * wpriv: Wdsp_glink private structure. |
| 519 | * pkt: Glink registration packet contains glink channel information. |
| 520 | */ |
| 521 | static int wdsp_glink_ch_info_init(struct wdsp_glink_priv *wpriv, |
| 522 | struct wdsp_reg_pkt *pkt) |
| 523 | { |
| 524 | int ret = 0, i, j; |
| 525 | struct glink_link_info link_info; |
| 526 | struct wdsp_glink_ch_cfg *ch_cfg; |
| 527 | struct wdsp_glink_ch **ch; |
| 528 | u8 no_of_channels; |
| 529 | u8 *payload; |
| 530 | u32 ch_size, ch_cfg_size; |
| 531 | |
| 532 | payload = (u8 *)pkt->payload; |
| 533 | no_of_channels = pkt->no_of_channels; |
| 534 | |
| 535 | ch = kcalloc(no_of_channels, sizeof(struct wdsp_glink_ch *), |
| 536 | GFP_KERNEL); |
| 537 | if (!ch) { |
| 538 | ret = -ENOMEM; |
| 539 | goto done; |
| 540 | } |
| 541 | |
| 542 | for (i = 0; i < no_of_channels; i++) { |
| 543 | ch_cfg = (struct wdsp_glink_ch_cfg *)payload; |
| 544 | ch_cfg_size = sizeof(struct wdsp_glink_ch_cfg) + |
| 545 | (sizeof(u32) * ch_cfg->no_of_intents); |
| 546 | ch_size = sizeof(struct wdsp_glink_ch) + |
| 547 | (sizeof(u32) * ch_cfg->no_of_intents); |
| 548 | |
| 549 | dev_dbg(wpriv->dev, "%s: channels = %d, ch_cfg_size %d", |
| 550 | __func__, no_of_channels, ch_cfg_size); |
| 551 | |
| 552 | ch[i] = kzalloc(ch_size, GFP_KERNEL); |
| 553 | if (!ch[i]) { |
| 554 | ret = -ENOMEM; |
| 555 | goto err_ch_mem; |
| 556 | } |
| 557 | ch[i]->channel_state = GLINK_LOCAL_DISCONNECTED; |
| 558 | memcpy(&ch[i]->ch_cfg, payload, ch_cfg_size); |
| 559 | payload += ch_cfg_size; |
| 560 | |
| 561 | mutex_init(&ch[i]->mutex); |
| 562 | ch[i]->wpriv = wpriv; |
| 563 | INIT_WORK(&ch[i]->lcl_ch_open_wrk, wdsp_glink_lcl_ch_open_wrk); |
| 564 | INIT_WORK(&ch[i]->lcl_ch_cls_wrk, wdsp_glink_lcl_ch_cls_wrk); |
| 565 | init_waitqueue_head(&ch[i]->ch_connect_wait); |
| 566 | } |
| 567 | wpriv->ch = ch; |
| 568 | wpriv->no_of_channels = no_of_channels; |
| 569 | |
| 570 | INIT_WORK(&wpriv->ch_open_cls_wrk, wdsp_glink_ch_open_cls_wrk); |
| 571 | |
| 572 | /* Register glink link_state notification */ |
| 573 | link_info.glink_link_state_notif_cb = wdsp_glink_link_state_cb; |
| 574 | link_info.transport = NULL; |
| 575 | link_info.edge = WDSP_EDGE; |
| 576 | |
| 577 | wpriv->glink_state.link_state = GLINK_LINK_STATE_DOWN; |
| 578 | wpriv->glink_state.handle = glink_register_link_state_cb(&link_info, |
| 579 | wpriv); |
| 580 | if (!wpriv->glink_state.handle) { |
| 581 | dev_err(wpriv->dev, "%s: Unable to register wdsp link state\n", |
| 582 | __func__); |
| 583 | ret = -EINVAL; |
| 584 | goto err_ch_mem; |
| 585 | } |
| 586 | goto done; |
| 587 | |
| 588 | err_ch_mem: |
| 589 | for (j = 0; j < i; j++) { |
| 590 | mutex_destroy(&ch[j]->mutex); |
| 591 | kfree(wpriv->ch[j]); |
| 592 | wpriv->ch[j] = NULL; |
| 593 | } |
| 594 | kfree(wpriv->ch); |
| 595 | wpriv->ch = NULL; |
| 596 | wpriv->no_of_channels = 0; |
| 597 | |
| 598 | done: |
| 599 | return ret; |
| 600 | } |
| 601 | |
| 602 | /* |
| 603 | * wdsp_glink_tx_buf_work - Work queue function to send tx buffer to glink |
| 604 | * work: Work structure |
| 605 | */ |
| 606 | static void wdsp_glink_tx_buf_work(struct work_struct *work) |
| 607 | { |
| 608 | struct wdsp_glink_priv *wpriv; |
| 609 | struct wdsp_glink_ch *ch; |
| 610 | struct wdsp_glink_tx_buf *tx_buf; |
| 611 | struct wdsp_write_pkt *wpkt; |
| 612 | struct wdsp_cmd_pkt *cpkt; |
| 613 | int ret = 0; |
| 614 | |
| 615 | tx_buf = container_of(work, struct wdsp_glink_tx_buf, |
| 616 | tx_work); |
| 617 | ch = tx_buf->ch; |
| 618 | wpriv = ch->wpriv; |
| 619 | wpkt = (struct wdsp_write_pkt *)tx_buf->buf; |
| 620 | cpkt = (struct wdsp_cmd_pkt *)wpkt->payload; |
| 621 | dev_dbg(wpriv->dev, "%s: ch name = %s, payload size = %d\n", |
| 622 | __func__, cpkt->ch_name, cpkt->payload_size); |
| 623 | |
| 624 | mutex_lock(&tx_buf->ch->mutex); |
| 625 | if (ch->channel_state == GLINK_CONNECTED) { |
| 626 | mutex_unlock(&tx_buf->ch->mutex); |
| 627 | ret = glink_tx(ch->handle, tx_buf, |
| 628 | cpkt->payload, cpkt->payload_size, |
| 629 | GLINK_TX_REQ_INTENT); |
| 630 | if (IS_ERR_VALUE(ret)) { |
| 631 | dev_err(wpriv->dev, "%s: glink tx failed, ret = %d\n", |
| 632 | __func__, ret); |
| 633 | /* |
| 634 | * If glink_tx() is failed then free tx_buf here as |
| 635 | * there won't be any tx_done notification to |
| 636 | * free the buffer. |
| 637 | */ |
| 638 | kfree(tx_buf); |
| 639 | } |
| 640 | } else { |
| 641 | mutex_unlock(&tx_buf->ch->mutex); |
| 642 | dev_err(wpriv->dev, "%s: channel %s is not in connected state\n", |
| 643 | __func__, ch->ch_cfg.name); |
| 644 | /* |
| 645 | * Free tx_buf here as there won't be any tx_done |
| 646 | * notification in this case also. |
| 647 | */ |
| 648 | kfree(tx_buf); |
| 649 | } |
| 650 | } |
| 651 | |
| 652 | /* |
| 653 | * wdsp_glink_read - Read API to send the data to userspace |
| 654 | * file: Pointer to the file structure |
| 655 | * buf: Pointer to the userspace buffer |
| 656 | * count: Number bytes to read from the file |
| 657 | * ppos: Pointer to the position into the file |
| 658 | */ |
| 659 | static ssize_t wdsp_glink_read(struct file *file, char __user *buf, |
| 660 | size_t count, loff_t *ppos) |
| 661 | { |
| 662 | int ret = 0, ret1 = 0; |
| 663 | struct wdsp_glink_rsp_que *rsp; |
| 664 | struct wdsp_glink_priv *wpriv; |
| 665 | |
| 666 | wpriv = (struct wdsp_glink_priv *)file->private_data; |
| 667 | if (!wpriv) { |
| 668 | pr_err("%s: Invalid private data\n", __func__); |
| 669 | ret = -EINVAL; |
| 670 | goto done; |
| 671 | } |
| 672 | |
| 673 | if (count > WDSP_MAX_READ_SIZE) { |
| 674 | dev_info(wpriv->dev, "%s: count = %zd is more than WDSP_MAX_READ_SIZE\n", |
| 675 | __func__, count); |
| 676 | count = WDSP_MAX_READ_SIZE; |
| 677 | } |
| 678 | /* |
| 679 | * Complete signal has given from glink rx notification callback |
| 680 | * or from flush API. Also use interruptible wait_for_completion API |
| 681 | * to allow the system to go in suspend. |
| 682 | */ |
| 683 | ret = wait_for_completion_interruptible(&wpriv->rsp_complete); |
| 684 | if (ret) |
| 685 | goto done; |
| 686 | |
| 687 | mutex_lock(&wpriv->rsp_mutex); |
| 688 | if (wpriv->rsp_cnt) { |
| 689 | wpriv->rsp_cnt--; |
| 690 | dev_dbg(wpriv->dev, "%s: read from buffer %d\n", |
| 691 | __func__, wpriv->rsp_cnt); |
| 692 | |
| 693 | rsp = &wpriv->rsp[wpriv->rsp_cnt]; |
| 694 | if (count < rsp->buf_size) { |
| 695 | ret1 = copy_to_user(buf, &rsp->buf, count); |
| 696 | /* Return the number of bytes copied */ |
| 697 | ret = count; |
| 698 | } else { |
| 699 | ret1 = copy_to_user(buf, &rsp->buf, rsp->buf_size); |
| 700 | /* Return the number of bytes copied */ |
| 701 | ret = rsp->buf_size; |
| 702 | } |
| 703 | |
| 704 | if (ret1) { |
| 705 | mutex_unlock(&wpriv->rsp_mutex); |
| 706 | dev_err(wpriv->dev, "%s: copy_to_user failed %d\n", |
| 707 | __func__, ret); |
| 708 | ret = -EFAULT; |
| 709 | goto done; |
| 710 | } |
| 711 | } else { |
| 712 | /* |
| 713 | * This will execute only if flush API is called or |
| 714 | * something wrong with ref_cnt |
| 715 | */ |
| 716 | dev_dbg(wpriv->dev, "%s: resp count = %d\n", __func__, |
| 717 | wpriv->rsp_cnt); |
| 718 | ret = -EINVAL; |
| 719 | } |
| 720 | mutex_unlock(&wpriv->rsp_mutex); |
| 721 | |
| 722 | done: |
| 723 | return ret; |
| 724 | } |
| 725 | |
| 726 | /* |
| 727 | * wdsp_glink_write - Write API to receive the data from userspace |
| 728 | * file: Pointer to the file structure |
| 729 | * buf: Pointer to the userspace buffer |
| 730 | * count: Number bytes to read from the file |
| 731 | * ppos: Pointer to the position into the file |
| 732 | */ |
| 733 | static ssize_t wdsp_glink_write(struct file *file, const char __user *buf, |
| 734 | size_t count, loff_t *ppos) |
| 735 | { |
| 736 | int ret = 0, i, tx_buf_size; |
| 737 | struct wdsp_write_pkt *wpkt; |
| 738 | struct wdsp_cmd_pkt *cpkt; |
| 739 | struct wdsp_glink_tx_buf *tx_buf; |
| 740 | struct wdsp_glink_priv *wpriv; |
| 741 | |
| 742 | wpriv = (struct wdsp_glink_priv *)file->private_data; |
| 743 | if (!wpriv) { |
| 744 | pr_err("%s: Invalid private data\n", __func__); |
| 745 | ret = -EINVAL; |
| 746 | goto done; |
| 747 | } |
| 748 | |
| 749 | dev_dbg(wpriv->dev, "%s: count = %zd\n", __func__, count); |
| 750 | |
| 751 | if (count > WDSP_MAX_WRITE_SIZE) { |
| 752 | dev_info(wpriv->dev, "%s: count = %zd is more than WDSP_MAX_WRITE_SIZE\n", |
| 753 | __func__, count); |
| 754 | count = WDSP_MAX_WRITE_SIZE; |
| 755 | } |
| 756 | |
| 757 | tx_buf_size = count + sizeof(struct wdsp_glink_tx_buf); |
| 758 | tx_buf = kzalloc(tx_buf_size, GFP_KERNEL); |
| 759 | if (!tx_buf) { |
| 760 | ret = -ENOMEM; |
| 761 | goto done; |
| 762 | } |
| 763 | |
| 764 | ret = copy_from_user(tx_buf->buf, buf, count); |
| 765 | if (ret) { |
| 766 | dev_err(wpriv->dev, "%s: copy_from_user failed %d\n", |
| 767 | __func__, ret); |
| 768 | ret = -EFAULT; |
| 769 | goto free_buf; |
| 770 | } |
| 771 | |
| 772 | wpkt = (struct wdsp_write_pkt *)tx_buf->buf; |
| 773 | switch (wpkt->pkt_type) { |
| 774 | case WDSP_REG_PKT: |
| 775 | ret = wdsp_glink_ch_info_init(wpriv, |
| 776 | (struct wdsp_reg_pkt *)wpkt->payload); |
| 777 | if (IS_ERR_VALUE(ret)) |
| 778 | dev_err(wpriv->dev, "%s: glink register failed, ret = %d\n", |
| 779 | __func__, ret); |
| 780 | kfree(tx_buf); |
| 781 | break; |
| 782 | case WDSP_READY_PKT: |
| 783 | ret = wait_event_timeout(wpriv->link_state_wait, |
| 784 | (wpriv->glink_state.link_state == |
| 785 | GLINK_LINK_STATE_UP), |
| 786 | msecs_to_jiffies(TIMEOUT_MS)); |
| 787 | if (!ret) { |
| 788 | dev_err(wpriv->dev, "%s: Link state wait timeout\n", |
| 789 | __func__); |
| 790 | ret = -ETIMEDOUT; |
| 791 | goto free_buf; |
| 792 | } |
| 793 | ret = 0; |
| 794 | kfree(tx_buf); |
| 795 | break; |
| 796 | case WDSP_CMD_PKT: |
| 797 | mutex_lock(&wpriv->glink_mutex); |
| 798 | if (wpriv->glink_state.link_state == GLINK_LINK_STATE_DOWN) { |
| 799 | mutex_unlock(&wpriv->glink_mutex); |
| 800 | dev_err(wpriv->dev, "%s: Link state is Down\n", |
| 801 | __func__); |
| 802 | |
| 803 | ret = -ENETRESET; |
| 804 | goto free_buf; |
| 805 | } |
| 806 | mutex_unlock(&wpriv->glink_mutex); |
| 807 | |
| 808 | cpkt = (struct wdsp_cmd_pkt *)wpkt->payload; |
| 809 | dev_dbg(wpriv->dev, "%s: requested ch_name: %s\n", __func__, |
| 810 | cpkt->ch_name); |
| 811 | for (i = 0; i < wpriv->no_of_channels; i++) { |
| 812 | if (wpriv->ch && wpriv->ch[i] && |
| 813 | (!strcmp(cpkt->ch_name, |
| 814 | wpriv->ch[i]->ch_cfg.name))) { |
| 815 | tx_buf->ch = wpriv->ch[i]; |
| 816 | break; |
| 817 | } |
| 818 | } |
| 819 | if (!tx_buf->ch) { |
| 820 | dev_err(wpriv->dev, "%s: Failed to get glink channel\n", |
| 821 | __func__); |
| 822 | ret = -EINVAL; |
| 823 | goto free_buf; |
| 824 | } |
| 825 | |
| 826 | ret = wait_event_timeout(tx_buf->ch->ch_connect_wait, |
| 827 | (tx_buf->ch->channel_state == |
| 828 | GLINK_CONNECTED), |
| 829 | msecs_to_jiffies(TIMEOUT_MS)); |
| 830 | if (!ret) { |
| 831 | dev_err(wpriv->dev, "%s: glink channel %s is not in connected state %d\n", |
| 832 | __func__, tx_buf->ch->ch_cfg.name, |
| 833 | tx_buf->ch->channel_state); |
| 834 | ret = -ETIMEDOUT; |
| 835 | goto free_buf; |
| 836 | } |
| 837 | ret = 0; |
| 838 | |
| 839 | INIT_WORK(&tx_buf->tx_work, wdsp_glink_tx_buf_work); |
| 840 | queue_work(wpriv->work_queue, &tx_buf->tx_work); |
| 841 | break; |
| 842 | default: |
| 843 | dev_err(wpriv->dev, "%s: Invalid packet type\n", __func__); |
| 844 | ret = -EINVAL; |
| 845 | kfree(tx_buf); |
| 846 | break; |
| 847 | } |
| 848 | goto done; |
| 849 | |
| 850 | free_buf: |
| 851 | kfree(tx_buf); |
| 852 | |
| 853 | done: |
| 854 | return ret; |
| 855 | } |
| 856 | |
| 857 | /* |
| 858 | * wdsp_glink_open - Open API to initialize private data |
| 859 | * inode: Pointer to the inode structure |
| 860 | * file: Pointer to the file structure |
| 861 | */ |
| 862 | static int wdsp_glink_open(struct inode *inode, struct file *file) |
| 863 | { |
| 864 | int ret = 0; |
| 865 | struct wdsp_glink_priv *wpriv; |
| 866 | struct wdsp_glink_dev *wdev; |
| 867 | |
| 868 | if (!inode->i_cdev) { |
| 869 | pr_err("%s: cdev is NULL\n", __func__); |
| 870 | ret = -EINVAL; |
| 871 | goto done; |
| 872 | } |
| 873 | wdev = container_of(inode->i_cdev, struct wdsp_glink_dev, cdev); |
| 874 | |
| 875 | wpriv = kzalloc(sizeof(struct wdsp_glink_priv), GFP_KERNEL); |
| 876 | if (!wpriv) { |
| 877 | ret = -ENOMEM; |
| 878 | goto done; |
| 879 | } |
| 880 | wpriv->dev = wdev->dev; |
| 881 | wpriv->work_queue = create_singlethread_workqueue("wdsp_glink_wq"); |
| 882 | if (!wpriv->work_queue) { |
| 883 | dev_err(wpriv->dev, "%s: Error creating wdsp_glink_wq\n", |
| 884 | __func__); |
| 885 | ret = -EINVAL; |
| 886 | goto err_wq; |
| 887 | } |
| 888 | |
| 889 | init_completion(&wpriv->rsp_complete); |
| 890 | init_waitqueue_head(&wpriv->link_state_wait); |
| 891 | mutex_init(&wpriv->rsp_mutex); |
| 892 | mutex_init(&wpriv->glink_mutex); |
| 893 | file->private_data = wpriv; |
| 894 | |
| 895 | goto done; |
| 896 | |
| 897 | err_wq: |
| 898 | kfree(wpriv); |
| 899 | |
| 900 | done: |
| 901 | return ret; |
| 902 | } |
| 903 | |
| 904 | /* |
| 905 | * wdsp_glink_flush - Flush API to unblock read. |
| 906 | * file: Pointer to the file structure |
| 907 | * id: Lock owner ID |
| 908 | */ |
| 909 | static int wdsp_glink_flush(struct file *file, fl_owner_t id) |
| 910 | { |
| 911 | struct wdsp_glink_priv *wpriv; |
| 912 | |
| 913 | wpriv = (struct wdsp_glink_priv *)file->private_data; |
| 914 | if (!wpriv) { |
| 915 | pr_err("%s: Invalid private data\n", __func__); |
| 916 | return -EINVAL; |
| 917 | } |
| 918 | |
| 919 | complete(&wpriv->rsp_complete); |
| 920 | |
| 921 | return 0; |
| 922 | } |
| 923 | |
| 924 | /* |
| 925 | * wdsp_glink_release - Release API to clean up resources. |
| 926 | * Whenever a file structure is shared across multiple threads, |
| 927 | * release won't be invoked until all copies are closed |
| 928 | * (file->f_count.counter should be 0). If we need to flush pending |
| 929 | * data when any copy is closed, you should implement the flush method. |
| 930 | * |
| 931 | * inode: Pointer to the inode structure |
| 932 | * file: Pointer to the file structure |
| 933 | */ |
| 934 | static int wdsp_glink_release(struct inode *inode, struct file *file) |
| 935 | { |
| 936 | int i, ret = 0; |
| 937 | struct wdsp_glink_priv *wpriv; |
| 938 | |
| 939 | wpriv = (struct wdsp_glink_priv *)file->private_data; |
| 940 | if (!wpriv) { |
| 941 | pr_err("%s: Invalid private data\n", __func__); |
| 942 | ret = -EINVAL; |
| 943 | goto done; |
| 944 | } |
| 945 | |
| 946 | if (wpriv->glink_state.handle) |
| 947 | glink_unregister_link_state_cb(wpriv->glink_state.handle); |
| 948 | |
| 949 | flush_workqueue(wpriv->work_queue); |
| 950 | destroy_workqueue(wpriv->work_queue); |
| 951 | |
| 952 | /* |
| 953 | * Clean up glink channel memory in channel state |
| 954 | * callback only if close channels are called from here. |
| 955 | */ |
| 956 | if (wpriv->ch) { |
| 957 | for (i = 0; i < wpriv->no_of_channels; i++) { |
| 958 | if (wpriv->ch[i]) { |
| 959 | wpriv->ch[i]->free_mem = true; |
| 960 | /* |
| 961 | * Channel handle NULL means channel is already |
| 962 | * closed. Free the channel memory here itself. |
| 963 | */ |
| 964 | if (!wpriv->ch[i]->handle) { |
| 965 | kfree(wpriv->ch[i]); |
| 966 | wpriv->ch[i] = NULL; |
| 967 | } else { |
| 968 | wdsp_glink_close_ch(wpriv->ch[i]); |
| 969 | } |
| 970 | } |
| 971 | } |
| 972 | |
| 973 | kfree(wpriv->ch); |
| 974 | wpriv->ch = NULL; |
| 975 | } |
| 976 | |
| 977 | mutex_destroy(&wpriv->glink_mutex); |
| 978 | mutex_destroy(&wpriv->rsp_mutex); |
| 979 | kfree(wpriv); |
| 980 | file->private_data = NULL; |
| 981 | |
| 982 | done: |
| 983 | return ret; |
| 984 | } |
| 985 | |
| 986 | static const struct file_operations wdsp_glink_fops = { |
| 987 | .owner = THIS_MODULE, |
| 988 | .open = wdsp_glink_open, |
| 989 | .read = wdsp_glink_read, |
| 990 | .write = wdsp_glink_write, |
| 991 | .flush = wdsp_glink_flush, |
| 992 | .release = wdsp_glink_release, |
| 993 | }; |
| 994 | |
| 995 | /* |
| 996 | * wdsp_glink_probe - Driver probe to expose char device |
| 997 | * pdev: Pointer to device tree data. |
| 998 | */ |
| 999 | static int wdsp_glink_probe(struct platform_device *pdev) |
| 1000 | { |
| 1001 | int ret; |
| 1002 | struct wdsp_glink_dev *wdev; |
| 1003 | |
| 1004 | wdev = devm_kzalloc(&pdev->dev, sizeof(*wdev), GFP_KERNEL); |
| 1005 | if (!wdev) { |
| 1006 | ret = -ENOMEM; |
| 1007 | goto done; |
| 1008 | } |
| 1009 | |
| 1010 | ret = alloc_chrdev_region(&wdev->dev_num, 0, MINOR_NUMBER_COUNT, |
| 1011 | WDSP_GLINK_DRIVER_NAME); |
| 1012 | if (IS_ERR_VALUE(ret)) { |
| 1013 | dev_err(&pdev->dev, "%s: Failed to alloc char dev, err = %d\n", |
| 1014 | __func__, ret); |
| 1015 | goto err_chrdev; |
| 1016 | } |
| 1017 | |
| 1018 | wdev->cls = class_create(THIS_MODULE, WDSP_GLINK_DRIVER_NAME); |
| 1019 | if (IS_ERR(wdev->cls)) { |
| 1020 | ret = PTR_ERR(wdev->cls); |
| 1021 | dev_err(&pdev->dev, "%s: Failed to create class, err = %d\n", |
| 1022 | __func__, ret); |
| 1023 | goto err_class; |
| 1024 | } |
| 1025 | |
| 1026 | wdev->dev = device_create(wdev->cls, NULL, wdev->dev_num, |
| 1027 | NULL, WDSP_GLINK_DRIVER_NAME); |
| 1028 | if (IS_ERR(wdev->dev)) { |
| 1029 | ret = PTR_ERR(wdev->dev); |
| 1030 | dev_err(&pdev->dev, "%s: Failed to create device, err = %d\n", |
| 1031 | __func__, ret); |
| 1032 | goto err_dev_create; |
| 1033 | } |
| 1034 | |
| 1035 | cdev_init(&wdev->cdev, &wdsp_glink_fops); |
| 1036 | ret = cdev_add(&wdev->cdev, wdev->dev_num, MINOR_NUMBER_COUNT); |
| 1037 | if (IS_ERR_VALUE(ret)) { |
| 1038 | dev_err(&pdev->dev, "%s: Failed to register char dev, err = %d\n", |
| 1039 | __func__, ret); |
| 1040 | goto err_cdev_add; |
| 1041 | } |
| 1042 | platform_set_drvdata(pdev, wdev); |
| 1043 | goto done; |
| 1044 | |
| 1045 | err_cdev_add: |
| 1046 | device_destroy(wdev->cls, wdev->dev_num); |
| 1047 | |
| 1048 | err_dev_create: |
| 1049 | class_destroy(wdev->cls); |
| 1050 | |
| 1051 | err_class: |
| 1052 | unregister_chrdev_region(0, MINOR_NUMBER_COUNT); |
| 1053 | |
| 1054 | err_chrdev: |
| 1055 | devm_kfree(&pdev->dev, wdev); |
| 1056 | |
| 1057 | done: |
| 1058 | return ret; |
| 1059 | } |
| 1060 | |
| 1061 | /* |
| 1062 | * wdsp_glink_remove - Driver remove to handle cleanup |
| 1063 | * pdev: Pointer to device tree data. |
| 1064 | */ |
| 1065 | static int wdsp_glink_remove(struct platform_device *pdev) |
| 1066 | { |
| 1067 | struct wdsp_glink_dev *wdev = platform_get_drvdata(pdev); |
| 1068 | |
| 1069 | if (wdev) { |
| 1070 | cdev_del(&wdev->cdev); |
| 1071 | device_destroy(wdev->cls, wdev->dev_num); |
| 1072 | class_destroy(wdev->cls); |
| 1073 | unregister_chrdev_region(0, MINOR_NUMBER_COUNT); |
| 1074 | devm_kfree(&pdev->dev, wdev); |
| 1075 | } else { |
| 1076 | dev_err(&pdev->dev, "%s: Invalid device data\n", __func__); |
| 1077 | } |
| 1078 | |
| 1079 | return 0; |
| 1080 | } |
| 1081 | |
| 1082 | static const struct of_device_id wdsp_glink_of_match[] = { |
| 1083 | {.compatible = "qcom,wcd-dsp-glink"}, |
| 1084 | { } |
| 1085 | }; |
| 1086 | MODULE_DEVICE_TABLE(of, wdsp_glink_of_match); |
| 1087 | |
| 1088 | static struct platform_driver wdsp_glink_driver = { |
| 1089 | .probe = wdsp_glink_probe, |
| 1090 | .remove = wdsp_glink_remove, |
| 1091 | .driver = { |
| 1092 | .name = WDSP_GLINK_DRIVER_NAME, |
| 1093 | .owner = THIS_MODULE, |
| 1094 | .of_match_table = wdsp_glink_of_match, |
| 1095 | }, |
| 1096 | }; |
| 1097 | |
| 1098 | module_platform_driver(wdsp_glink_driver); |
| 1099 | |
| 1100 | MODULE_DESCRIPTION("SoC WCD_DSP GLINK Driver"); |
| 1101 | MODULE_LICENSE("GPL v2"); |