Laxminath Kasam | d1f3619 | 2017-08-03 18:54:01 +0530 | [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 <linux/vmalloc.h> |
| 25 | #include <soc/qcom/glink.h> |
| 26 | #include "sound/wcd-dsp-glink.h" |
| 27 | |
| 28 | #define WDSP_GLINK_DRIVER_NAME "wcd-dsp-glink" |
| 29 | #define WDSP_MAX_WRITE_SIZE (256 * 1024) |
| 30 | #define WDSP_MAX_READ_SIZE (4 * 1024) |
| 31 | #define WDSP_MAX_NO_OF_INTENTS (20) |
| 32 | #define WDSP_MAX_NO_OF_CHANNELS (10) |
| 33 | #define WDSP_WRITE_PKT_SIZE (sizeof(struct wdsp_write_pkt)) |
| 34 | #define WDSP_REG_PKT_SIZE (sizeof(struct wdsp_reg_pkt)) |
| 35 | #define WDSP_CMD_PKT_SIZE (sizeof(struct wdsp_cmd_pkt)) |
| 36 | #define WDSP_CH_CFG_SIZE (sizeof(struct wdsp_glink_ch_cfg)) |
| 37 | |
| 38 | #define MINOR_NUMBER_COUNT 1 |
| 39 | #define WDSP_EDGE "wdsp" |
| 40 | #define RESP_QUEUE_SIZE 3 |
| 41 | #define QOS_PKT_SIZE 1024 |
| 42 | #define TIMEOUT_MS 1000 |
| 43 | |
| 44 | struct wdsp_glink_dev { |
| 45 | struct class *cls; |
| 46 | struct device *dev; |
| 47 | struct cdev cdev; |
| 48 | dev_t dev_num; |
| 49 | }; |
| 50 | |
| 51 | struct wdsp_glink_rsp_que { |
| 52 | /* Size of valid data in buffer */ |
| 53 | u32 buf_size; |
| 54 | |
| 55 | /* Response buffer */ |
| 56 | u8 buf[WDSP_MAX_READ_SIZE]; |
| 57 | }; |
| 58 | |
| 59 | struct wdsp_glink_tx_buf { |
| 60 | struct work_struct tx_work; |
| 61 | struct work_struct free_tx_work; |
| 62 | |
| 63 | /* Glink channel information */ |
| 64 | struct wdsp_glink_ch *ch; |
| 65 | |
| 66 | /* Tx buffer to send to glink */ |
| 67 | u8 buf[0]; |
| 68 | }; |
| 69 | |
| 70 | struct wdsp_glink_ch { |
| 71 | struct wdsp_glink_priv *wpriv; |
| 72 | |
| 73 | /* Glink channel handle */ |
| 74 | void *handle; |
| 75 | |
| 76 | /* Channel states like connect, disconnect */ |
| 77 | int channel_state; |
| 78 | struct mutex mutex; |
| 79 | |
| 80 | /* To free up the channel memory */ |
| 81 | bool free_mem; |
| 82 | |
| 83 | /* Glink local channel open work */ |
| 84 | struct work_struct lcl_ch_open_wrk; |
| 85 | |
| 86 | /* Glink local channel close work */ |
| 87 | struct work_struct lcl_ch_cls_wrk; |
| 88 | |
| 89 | /* Wait for ch connect state before sending any command */ |
| 90 | wait_queue_head_t ch_connect_wait; |
| 91 | |
| 92 | /* |
| 93 | * Glink channel configuration. This has to be the last |
| 94 | * member of the strucuture as it has variable size |
| 95 | */ |
| 96 | struct wdsp_glink_ch_cfg ch_cfg; |
| 97 | }; |
| 98 | |
| 99 | struct wdsp_glink_state { |
| 100 | /* Glink link state information */ |
| 101 | enum glink_link_state link_state; |
| 102 | void *handle; |
| 103 | }; |
| 104 | |
| 105 | struct wdsp_glink_priv { |
| 106 | /* Respone buffer related */ |
| 107 | u8 rsp_cnt; |
| 108 | struct wdsp_glink_rsp_que rsp[RESP_QUEUE_SIZE]; |
| 109 | struct completion rsp_complete; |
| 110 | struct mutex rsp_mutex; |
| 111 | |
| 112 | /* Glink channel related */ |
| 113 | struct mutex glink_mutex; |
| 114 | struct wdsp_glink_state glink_state; |
| 115 | struct wdsp_glink_ch **ch; |
| 116 | u8 no_of_channels; |
| 117 | struct work_struct ch_open_cls_wrk; |
| 118 | struct workqueue_struct *work_queue; |
| 119 | |
| 120 | wait_queue_head_t link_state_wait; |
| 121 | |
| 122 | struct device *dev; |
| 123 | }; |
| 124 | |
| 125 | static int wdsp_glink_close_ch(struct wdsp_glink_ch *ch); |
| 126 | static int wdsp_glink_open_ch(struct wdsp_glink_ch *ch); |
| 127 | |
| 128 | /* |
| 129 | * wdsp_glink_free_tx_buf_work - Work function to free tx pkt |
| 130 | * work: Work structure |
| 131 | */ |
| 132 | static void wdsp_glink_free_tx_buf_work(struct work_struct *work) |
| 133 | { |
| 134 | struct wdsp_glink_tx_buf *tx_buf; |
| 135 | |
| 136 | tx_buf = container_of(work, struct wdsp_glink_tx_buf, |
| 137 | free_tx_work); |
| 138 | vfree(tx_buf); |
| 139 | } |
| 140 | |
| 141 | /* |
| 142 | * wdsp_glink_free_tx_buf - Function to free tx buffer |
| 143 | * priv: Pointer to the channel |
| 144 | * pkt_priv: Pointer to the tx buffer |
| 145 | */ |
| 146 | static void wdsp_glink_free_tx_buf(const void *priv, const void *pkt_priv) |
| 147 | { |
| 148 | struct wdsp_glink_tx_buf *tx_buf = (struct wdsp_glink_tx_buf *)pkt_priv; |
| 149 | struct wdsp_glink_priv *wpriv; |
| 150 | struct wdsp_glink_ch *ch; |
| 151 | |
| 152 | if (!priv) { |
| 153 | pr_err("%s: Invalid priv\n", __func__); |
| 154 | return; |
| 155 | } |
| 156 | if (!tx_buf) { |
| 157 | pr_err("%s: Invalid tx_buf\n", __func__); |
| 158 | return; |
| 159 | } |
| 160 | |
| 161 | ch = (struct wdsp_glink_ch *)priv; |
| 162 | wpriv = ch->wpriv; |
| 163 | /* Work queue to free tx pkt */ |
| 164 | INIT_WORK(&tx_buf->free_tx_work, wdsp_glink_free_tx_buf_work); |
| 165 | queue_work(wpriv->work_queue, &tx_buf->free_tx_work); |
| 166 | } |
| 167 | |
| 168 | /* |
| 169 | * wdsp_glink_notify_rx - Glink notify rx callback for responses |
| 170 | * handle: Opaque Channel handle returned by GLink |
| 171 | * priv: Private pointer to the channel |
| 172 | * pkt_priv: Private pointer to the packet |
| 173 | * ptr: Pointer to the Rx data |
| 174 | * size: Size of the Rx data |
| 175 | */ |
| 176 | static void wdsp_glink_notify_rx(void *handle, const void *priv, |
| 177 | const void *pkt_priv, const void *ptr, |
| 178 | size_t size) |
| 179 | { |
| 180 | u8 *rx_buf; |
| 181 | u8 rsp_cnt; |
| 182 | struct wdsp_glink_ch *ch; |
| 183 | struct wdsp_glink_priv *wpriv; |
| 184 | |
| 185 | if (!ptr || !priv) { |
| 186 | pr_err("%s: Invalid parameters\n", __func__); |
| 187 | return; |
| 188 | } |
| 189 | |
| 190 | ch = (struct wdsp_glink_ch *)priv; |
| 191 | wpriv = ch->wpriv; |
| 192 | rx_buf = (u8 *)ptr; |
| 193 | if (size > WDSP_MAX_READ_SIZE) { |
| 194 | dev_err(wpriv->dev, "%s: Size %zd is greater than allowed %d\n", |
| 195 | __func__, size, WDSP_MAX_READ_SIZE); |
| 196 | size = WDSP_MAX_READ_SIZE; |
| 197 | } |
| 198 | |
| 199 | mutex_lock(&wpriv->rsp_mutex); |
| 200 | rsp_cnt = wpriv->rsp_cnt; |
| 201 | if (rsp_cnt >= RESP_QUEUE_SIZE) { |
| 202 | dev_err(wpriv->dev, "%s: Resp Queue is Full\n", __func__); |
| 203 | rsp_cnt = 0; |
| 204 | } |
| 205 | dev_dbg(wpriv->dev, "%s: copy into buffer %d\n", __func__, rsp_cnt); |
| 206 | |
| 207 | memcpy(wpriv->rsp[rsp_cnt].buf, rx_buf, size); |
| 208 | wpriv->rsp[rsp_cnt].buf_size = size; |
| 209 | wpriv->rsp_cnt = ++rsp_cnt; |
| 210 | mutex_unlock(&wpriv->rsp_mutex); |
| 211 | |
| 212 | glink_rx_done(handle, ptr, true); |
| 213 | complete(&wpriv->rsp_complete); |
| 214 | } |
| 215 | |
| 216 | /* |
| 217 | * wdsp_glink_notify_tx_done - Glink notify tx done callback to |
| 218 | * free tx buffer |
| 219 | * handle: Opaque Channel handle returned by GLink |
| 220 | * priv: Private pointer to the channel |
| 221 | * pkt_priv: Private pointer to the packet |
| 222 | * ptr: Pointer to the Tx data |
| 223 | */ |
| 224 | static void wdsp_glink_notify_tx_done(void *handle, const void *priv, |
| 225 | const void *pkt_priv, const void *ptr) |
| 226 | { |
| 227 | wdsp_glink_free_tx_buf(priv, pkt_priv); |
| 228 | } |
| 229 | /* |
| 230 | * wdsp_glink_notify_tx_abort - Glink notify tx abort callback to |
| 231 | * free tx buffer |
| 232 | * handle: Opaque Channel handle returned by GLink |
| 233 | * priv: Private pointer to the channel |
| 234 | * pkt_priv: Private pointer to the packet |
| 235 | */ |
| 236 | static void wdsp_glink_notify_tx_abort(void *handle, const void *priv, |
| 237 | const void *pkt_priv) |
| 238 | { |
| 239 | wdsp_glink_free_tx_buf(priv, pkt_priv); |
| 240 | } |
| 241 | |
| 242 | /* |
| 243 | * wdsp_glink_notify_rx_intent_req - Glink notify rx intent request callback |
| 244 | * to queue buffer to receive from remote client |
| 245 | * handle: Opaque channel handle returned by GLink |
| 246 | * priv: Private pointer to the channel |
| 247 | * req_size: Size of intent to be queued |
| 248 | */ |
| 249 | static bool wdsp_glink_notify_rx_intent_req(void *handle, const void *priv, |
| 250 | size_t req_size) |
| 251 | { |
| 252 | struct wdsp_glink_priv *wpriv; |
| 253 | struct wdsp_glink_ch *ch; |
| 254 | int rc = 0; |
| 255 | bool ret = false; |
| 256 | |
| 257 | if (!priv) { |
| 258 | pr_err("%s: Invalid priv\n", __func__); |
| 259 | goto done; |
| 260 | } |
| 261 | if (req_size > WDSP_MAX_READ_SIZE) { |
| 262 | pr_err("%s: Invalid req_size %zd\n", __func__, req_size); |
| 263 | goto done; |
| 264 | } |
| 265 | |
| 266 | ch = (struct wdsp_glink_ch *)priv; |
| 267 | wpriv = ch->wpriv; |
| 268 | |
| 269 | dev_dbg(wpriv->dev, "%s: intent size %zd requested for ch name %s", |
| 270 | __func__, req_size, ch->ch_cfg.name); |
| 271 | |
| 272 | mutex_lock(&ch->mutex); |
| 273 | rc = glink_queue_rx_intent(ch->handle, ch, req_size); |
| 274 | if (rc < 0) { |
| 275 | dev_err(wpriv->dev, "%s: Failed to queue rx intent, rc = %d\n", |
| 276 | __func__, rc); |
| 277 | mutex_unlock(&ch->mutex); |
| 278 | goto done; |
| 279 | } |
| 280 | mutex_unlock(&ch->mutex); |
| 281 | ret = true; |
| 282 | |
| 283 | done: |
| 284 | return ret; |
| 285 | } |
| 286 | |
| 287 | /* |
| 288 | * wdsp_glink_lcl_ch_open_wrk - Work function to open channel again |
| 289 | * when local disconnect event happens |
| 290 | * work: Work structure |
| 291 | */ |
| 292 | static void wdsp_glink_lcl_ch_open_wrk(struct work_struct *work) |
| 293 | { |
| 294 | struct wdsp_glink_ch *ch; |
| 295 | |
| 296 | ch = container_of(work, struct wdsp_glink_ch, |
| 297 | lcl_ch_open_wrk); |
| 298 | |
| 299 | wdsp_glink_open_ch(ch); |
| 300 | } |
| 301 | |
| 302 | /* |
| 303 | * wdsp_glink_lcl_ch_cls_wrk - Work function to close channel locally |
| 304 | * when remote disconnect event happens |
| 305 | * work: Work structure |
| 306 | */ |
| 307 | static void wdsp_glink_lcl_ch_cls_wrk(struct work_struct *work) |
| 308 | { |
| 309 | struct wdsp_glink_ch *ch; |
| 310 | |
| 311 | ch = container_of(work, struct wdsp_glink_ch, |
| 312 | lcl_ch_cls_wrk); |
| 313 | |
| 314 | wdsp_glink_close_ch(ch); |
| 315 | } |
| 316 | |
| 317 | /* |
| 318 | * wdsp_glink_notify_state - Glink channel state information event callback |
| 319 | * handle: Opaque Channel handle returned by GLink |
| 320 | * priv: Private pointer to the channel |
| 321 | * event: channel state event |
| 322 | */ |
| 323 | static void wdsp_glink_notify_state(void *handle, const void *priv, |
| 324 | unsigned int event) |
| 325 | { |
| 326 | struct wdsp_glink_priv *wpriv; |
| 327 | struct wdsp_glink_ch *ch; |
| 328 | int i, ret = 0; |
| 329 | |
| 330 | if (!priv) { |
| 331 | pr_err("%s: Invalid priv\n", __func__); |
| 332 | return; |
| 333 | } |
| 334 | |
| 335 | ch = (struct wdsp_glink_ch *)priv; |
| 336 | wpriv = ch->wpriv; |
| 337 | |
| 338 | mutex_lock(&ch->mutex); |
| 339 | ch->channel_state = event; |
| 340 | if (event == GLINK_CONNECTED) { |
| 341 | dev_dbg(wpriv->dev, "%s: glink channel: %s connected\n", |
| 342 | __func__, ch->ch_cfg.name); |
| 343 | |
| 344 | for (i = 0; i < ch->ch_cfg.no_of_intents; i++) { |
| 345 | dev_dbg(wpriv->dev, "%s: intent_size = %d\n", __func__, |
| 346 | ch->ch_cfg.intents_size[i]); |
| 347 | ret = glink_queue_rx_intent(ch->handle, ch, |
| 348 | ch->ch_cfg.intents_size[i]); |
| 349 | if (ret < 0) |
| 350 | dev_warn(wpriv->dev, "%s: Failed to queue intent %d of size %d\n", |
| 351 | __func__, i, |
| 352 | ch->ch_cfg.intents_size[i]); |
| 353 | } |
| 354 | |
| 355 | ret = glink_qos_latency(ch->handle, ch->ch_cfg.latency_in_us, |
| 356 | QOS_PKT_SIZE); |
| 357 | if (ret < 0) |
| 358 | dev_warn(wpriv->dev, "%s: Failed to request qos %d for ch %s\n", |
| 359 | __func__, ch->ch_cfg.latency_in_us, |
| 360 | ch->ch_cfg.name); |
| 361 | |
| 362 | wake_up(&ch->ch_connect_wait); |
| 363 | mutex_unlock(&ch->mutex); |
| 364 | } else if (event == GLINK_LOCAL_DISCONNECTED) { |
| 365 | /* |
| 366 | * Don't use dev_dbg here as dev may not be valid if channel |
| 367 | * closed from driver close. |
| 368 | */ |
| 369 | pr_debug("%s: channel: %s disconnected locally\n", |
| 370 | __func__, ch->ch_cfg.name); |
| 371 | mutex_unlock(&ch->mutex); |
| 372 | |
| 373 | if (ch->free_mem) { |
| 374 | kfree(ch); |
| 375 | ch = NULL; |
| 376 | } |
| 377 | } else if (event == GLINK_REMOTE_DISCONNECTED) { |
| 378 | dev_dbg(wpriv->dev, "%s: remote channel: %s disconnected remotely\n", |
| 379 | __func__, ch->ch_cfg.name); |
| 380 | mutex_unlock(&ch->mutex); |
| 381 | /* |
| 382 | * If remote disconnect happens, local side also has |
| 383 | * to close the channel as per glink design in a |
| 384 | * separate work_queue. |
| 385 | */ |
| 386 | queue_work(wpriv->work_queue, &ch->lcl_ch_cls_wrk); |
| 387 | } |
| 388 | } |
| 389 | |
| 390 | /* |
| 391 | * wdsp_glink_close_ch - Internal function to close glink channel |
| 392 | * ch: Glink Channel structure. |
| 393 | */ |
| 394 | static int wdsp_glink_close_ch(struct wdsp_glink_ch *ch) |
| 395 | { |
| 396 | struct wdsp_glink_priv *wpriv = ch->wpriv; |
| 397 | int ret = 0; |
| 398 | |
| 399 | mutex_lock(&wpriv->glink_mutex); |
| 400 | if (ch->handle) { |
| 401 | ret = glink_close(ch->handle); |
| 402 | if (ret < 0) { |
| 403 | dev_err(wpriv->dev, "%s: glink_close is failed, ret = %d\n", |
| 404 | __func__, ret); |
| 405 | } else { |
| 406 | ch->handle = NULL; |
| 407 | dev_dbg(wpriv->dev, "%s: ch %s is closed\n", __func__, |
| 408 | ch->ch_cfg.name); |
| 409 | } |
| 410 | } else { |
| 411 | dev_dbg(wpriv->dev, "%s: ch %s is already closed\n", __func__, |
| 412 | ch->ch_cfg.name); |
| 413 | } |
| 414 | mutex_unlock(&wpriv->glink_mutex); |
| 415 | |
| 416 | |
| 417 | return ret; |
| 418 | } |
| 419 | |
| 420 | /* |
| 421 | * wdsp_glink_open_ch - Internal function to open glink channel |
| 422 | * ch: Glink Channel structure. |
| 423 | */ |
| 424 | static int wdsp_glink_open_ch(struct wdsp_glink_ch *ch) |
| 425 | { |
| 426 | struct wdsp_glink_priv *wpriv = ch->wpriv; |
| 427 | struct glink_open_config open_cfg; |
| 428 | int ret = 0; |
| 429 | |
| 430 | mutex_lock(&wpriv->glink_mutex); |
| 431 | if (!ch->handle) { |
| 432 | memset(&open_cfg, 0, sizeof(open_cfg)); |
| 433 | open_cfg.options = GLINK_OPT_INITIAL_XPORT; |
| 434 | open_cfg.edge = WDSP_EDGE; |
| 435 | open_cfg.notify_rx = wdsp_glink_notify_rx; |
| 436 | open_cfg.notify_tx_done = wdsp_glink_notify_tx_done; |
| 437 | open_cfg.notify_tx_abort = wdsp_glink_notify_tx_abort; |
| 438 | open_cfg.notify_state = wdsp_glink_notify_state; |
| 439 | open_cfg.notify_rx_intent_req = wdsp_glink_notify_rx_intent_req; |
| 440 | open_cfg.priv = ch; |
| 441 | open_cfg.name = ch->ch_cfg.name; |
| 442 | |
| 443 | dev_dbg(wpriv->dev, "%s: ch->ch_cfg.name = %s, latency_in_us = %d, intents = %d\n", |
| 444 | __func__, ch->ch_cfg.name, ch->ch_cfg.latency_in_us, |
| 445 | ch->ch_cfg.no_of_intents); |
| 446 | |
| 447 | ch->handle = glink_open(&open_cfg); |
| 448 | if (IS_ERR_OR_NULL(ch->handle)) { |
| 449 | dev_err(wpriv->dev, "%s: glink_open failed for ch %s\n", |
| 450 | __func__, ch->ch_cfg.name); |
| 451 | ch->handle = NULL; |
| 452 | ret = -EINVAL; |
| 453 | } |
| 454 | } else { |
| 455 | dev_err(wpriv->dev, "%s: ch %s is already opened\n", __func__, |
| 456 | ch->ch_cfg.name); |
| 457 | } |
| 458 | mutex_unlock(&wpriv->glink_mutex); |
| 459 | |
| 460 | return ret; |
| 461 | } |
| 462 | |
| 463 | /* |
| 464 | * wdsp_glink_close_all_ch - Internal function to close all glink channels |
| 465 | * wpriv: Wdsp_glink private structure |
| 466 | */ |
| 467 | static void wdsp_glink_close_all_ch(struct wdsp_glink_priv *wpriv) |
| 468 | { |
| 469 | int i; |
| 470 | |
| 471 | for (i = 0; i < wpriv->no_of_channels; i++) |
| 472 | if (wpriv->ch && wpriv->ch[i]) |
| 473 | wdsp_glink_close_ch(wpriv->ch[i]); |
| 474 | } |
| 475 | |
| 476 | /* |
| 477 | * wdsp_glink_open_all_ch - Internal function to open all glink channels |
| 478 | * wpriv: Wdsp_glink private structure |
| 479 | */ |
| 480 | static int wdsp_glink_open_all_ch(struct wdsp_glink_priv *wpriv) |
| 481 | { |
| 482 | int ret = 0, i, j; |
| 483 | |
| 484 | for (i = 0; i < wpriv->no_of_channels; i++) { |
| 485 | if (wpriv->ch && wpriv->ch[i]) { |
| 486 | ret = wdsp_glink_open_ch(wpriv->ch[i]); |
| 487 | if (ret < 0) |
| 488 | goto err_open; |
| 489 | } |
| 490 | } |
| 491 | goto done; |
| 492 | |
| 493 | err_open: |
| 494 | for (j = 0; j < i; j++) |
| 495 | if (wpriv->ch[i]) |
| 496 | wdsp_glink_close_ch(wpriv->ch[j]); |
| 497 | |
| 498 | done: |
| 499 | return ret; |
| 500 | } |
| 501 | |
| 502 | /* |
| 503 | * wdsp_glink_ch_open_wq - Work function to open glink channels |
| 504 | * work: Work structure |
| 505 | */ |
| 506 | static void wdsp_glink_ch_open_cls_wrk(struct work_struct *work) |
| 507 | { |
| 508 | struct wdsp_glink_priv *wpriv; |
| 509 | |
| 510 | wpriv = container_of(work, struct wdsp_glink_priv, |
| 511 | ch_open_cls_wrk); |
| 512 | |
| 513 | if (wpriv->glink_state.link_state == GLINK_LINK_STATE_DOWN) { |
| 514 | dev_info(wpriv->dev, "%s: GLINK_LINK_STATE_DOWN\n", |
| 515 | __func__); |
| 516 | |
| 517 | wdsp_glink_close_all_ch(wpriv); |
| 518 | } else if (wpriv->glink_state.link_state == GLINK_LINK_STATE_UP) { |
| 519 | dev_info(wpriv->dev, "%s: GLINK_LINK_STATE_UP\n", |
| 520 | __func__); |
| 521 | |
| 522 | wdsp_glink_open_all_ch(wpriv); |
| 523 | } |
| 524 | } |
| 525 | |
| 526 | /* |
| 527 | * wdsp_glink_link_state_cb - Glink link state callback to inform |
| 528 | * about link states |
| 529 | * cb_info: Glink link state callback information structure |
| 530 | * priv: Private structure of link state passed while register |
| 531 | */ |
| 532 | static void wdsp_glink_link_state_cb(struct glink_link_state_cb_info *cb_info, |
| 533 | void *priv) |
| 534 | { |
| 535 | struct wdsp_glink_priv *wpriv; |
| 536 | |
| 537 | if (!cb_info || !priv) { |
| 538 | pr_err("%s: Invalid parameters\n", __func__); |
| 539 | return; |
| 540 | } |
| 541 | |
| 542 | wpriv = (struct wdsp_glink_priv *)priv; |
| 543 | |
| 544 | mutex_lock(&wpriv->glink_mutex); |
| 545 | wpriv->glink_state.link_state = cb_info->link_state; |
| 546 | wake_up(&wpriv->link_state_wait); |
| 547 | mutex_unlock(&wpriv->glink_mutex); |
| 548 | |
| 549 | queue_work(wpriv->work_queue, &wpriv->ch_open_cls_wrk); |
| 550 | } |
| 551 | |
| 552 | /* |
| 553 | * wdsp_glink_ch_info_init- Internal function to allocate channel memory |
| 554 | * and register with glink |
| 555 | * wpriv: Wdsp_glink private structure. |
| 556 | * pkt: Glink registration packet contains glink channel information. |
| 557 | * pkt_size: Size of the pkt. |
| 558 | */ |
| 559 | static int wdsp_glink_ch_info_init(struct wdsp_glink_priv *wpriv, |
| 560 | struct wdsp_reg_pkt *pkt, size_t pkt_size) |
| 561 | { |
| 562 | int ret = 0, i, j; |
| 563 | struct glink_link_info link_info; |
| 564 | struct wdsp_glink_ch_cfg *ch_cfg; |
| 565 | struct wdsp_glink_ch **ch; |
| 566 | u8 no_of_channels; |
| 567 | u8 *payload; |
| 568 | u32 ch_size, ch_cfg_size; |
| 569 | size_t size = WDSP_WRITE_PKT_SIZE + WDSP_REG_PKT_SIZE; |
| 570 | |
| 571 | mutex_lock(&wpriv->glink_mutex); |
| 572 | if (wpriv->ch) { |
Vidyakumar Athota | 60871bd | 2017-09-08 11:26:51 -0700 | [diff] [blame] | 573 | dev_err_ratelimited(wpriv->dev, "%s: glink ch memory is already allocated\n", |
Laxminath Kasam | d1f3619 | 2017-08-03 18:54:01 +0530 | [diff] [blame] | 574 | __func__); |
| 575 | ret = -EINVAL; |
| 576 | goto done; |
| 577 | } |
| 578 | payload = (u8 *)pkt->payload; |
| 579 | no_of_channels = pkt->no_of_channels; |
| 580 | |
| 581 | if (no_of_channels > WDSP_MAX_NO_OF_CHANNELS) { |
Vidyakumar Athota | 60871bd | 2017-09-08 11:26:51 -0700 | [diff] [blame] | 582 | dev_err_ratelimited(wpriv->dev, "%s: no_of_channels: %d but max allowed are %d\n", |
Laxminath Kasam | d1f3619 | 2017-08-03 18:54:01 +0530 | [diff] [blame] | 583 | __func__, no_of_channels, WDSP_MAX_NO_OF_CHANNELS); |
| 584 | ret = -EINVAL; |
| 585 | goto done; |
| 586 | } |
| 587 | ch = kcalloc(no_of_channels, sizeof(struct wdsp_glink_ch *), |
| 588 | GFP_ATOMIC); |
| 589 | if (!ch) { |
| 590 | ret = -ENOMEM; |
| 591 | goto done; |
| 592 | } |
| 593 | wpriv->ch = ch; |
| 594 | wpriv->no_of_channels = no_of_channels; |
| 595 | |
| 596 | for (i = 0; i < no_of_channels; i++) { |
| 597 | ch_cfg = (struct wdsp_glink_ch_cfg *)payload; |
| 598 | |
| 599 | size += WDSP_CH_CFG_SIZE; |
| 600 | if (size > pkt_size) { |
Vidyakumar Athota | 60871bd | 2017-09-08 11:26:51 -0700 | [diff] [blame] | 601 | dev_err_ratelimited(wpriv->dev, "%s: Invalid size = %zd, pkt_size = %zd\n", |
Laxminath Kasam | d1f3619 | 2017-08-03 18:54:01 +0530 | [diff] [blame] | 602 | __func__, size, pkt_size); |
| 603 | ret = -EINVAL; |
| 604 | goto err_ch_mem; |
| 605 | } |
| 606 | if (ch_cfg->no_of_intents > WDSP_MAX_NO_OF_INTENTS) { |
Vidyakumar Athota | 60871bd | 2017-09-08 11:26:51 -0700 | [diff] [blame] | 607 | dev_err_ratelimited(wpriv->dev, "%s: Invalid no_of_intents = %d\n", |
Laxminath Kasam | d1f3619 | 2017-08-03 18:54:01 +0530 | [diff] [blame] | 608 | __func__, ch_cfg->no_of_intents); |
| 609 | ret = -EINVAL; |
| 610 | goto err_ch_mem; |
| 611 | } |
| 612 | size += (sizeof(u32) * ch_cfg->no_of_intents); |
| 613 | if (size > pkt_size) { |
Vidyakumar Athota | 60871bd | 2017-09-08 11:26:51 -0700 | [diff] [blame] | 614 | dev_err_ratelimited(wpriv->dev, "%s: Invalid size = %zd, pkt_size = %zd\n", |
Laxminath Kasam | d1f3619 | 2017-08-03 18:54:01 +0530 | [diff] [blame] | 615 | __func__, size, pkt_size); |
| 616 | ret = -EINVAL; |
| 617 | goto err_ch_mem; |
| 618 | } |
| 619 | |
| 620 | ch_cfg_size = sizeof(struct wdsp_glink_ch_cfg) + |
| 621 | (sizeof(u32) * ch_cfg->no_of_intents); |
| 622 | ch_size = sizeof(struct wdsp_glink_ch) + |
| 623 | (sizeof(u32) * ch_cfg->no_of_intents); |
| 624 | |
| 625 | dev_dbg(wpriv->dev, "%s: channels: %d ch_cfg_size: %d, size: %zd, pkt_size: %zd", |
| 626 | __func__, no_of_channels, ch_cfg_size, size, pkt_size); |
| 627 | |
| 628 | ch[i] = kzalloc(ch_size, GFP_KERNEL); |
| 629 | if (!ch[i]) { |
| 630 | ret = -ENOMEM; |
| 631 | goto err_ch_mem; |
| 632 | } |
| 633 | ch[i]->channel_state = GLINK_LOCAL_DISCONNECTED; |
| 634 | memcpy(&ch[i]->ch_cfg, payload, ch_cfg_size); |
| 635 | payload += ch_cfg_size; |
| 636 | |
Vidyakumar Athota | 87c83b7 | 2017-09-19 12:06:46 -0700 | [diff] [blame^] | 637 | /* check ch name is valid string or not */ |
| 638 | for (j = 0; j < WDSP_CH_NAME_MAX_LEN; j++) { |
| 639 | if (ch[i]->ch_cfg.name[j] == '\0') |
| 640 | break; |
| 641 | } |
| 642 | |
| 643 | if (j == WDSP_CH_NAME_MAX_LEN) { |
| 644 | dev_err_ratelimited(wpriv->dev, "%s: Wrong channel name\n", |
| 645 | __func__); |
| 646 | kfree(ch[i]); |
| 647 | ch[i] = NULL; |
| 648 | ret = -EINVAL; |
| 649 | goto err_ch_mem; |
| 650 | } |
| 651 | |
Laxminath Kasam | d1f3619 | 2017-08-03 18:54:01 +0530 | [diff] [blame] | 652 | mutex_init(&ch[i]->mutex); |
| 653 | ch[i]->wpriv = wpriv; |
| 654 | INIT_WORK(&ch[i]->lcl_ch_open_wrk, wdsp_glink_lcl_ch_open_wrk); |
| 655 | INIT_WORK(&ch[i]->lcl_ch_cls_wrk, wdsp_glink_lcl_ch_cls_wrk); |
| 656 | init_waitqueue_head(&ch[i]->ch_connect_wait); |
| 657 | } |
| 658 | |
| 659 | INIT_WORK(&wpriv->ch_open_cls_wrk, wdsp_glink_ch_open_cls_wrk); |
| 660 | |
| 661 | /* Register glink link_state notification */ |
| 662 | link_info.glink_link_state_notif_cb = wdsp_glink_link_state_cb; |
| 663 | link_info.transport = NULL; |
| 664 | link_info.edge = WDSP_EDGE; |
| 665 | |
| 666 | wpriv->glink_state.link_state = GLINK_LINK_STATE_DOWN; |
| 667 | wpriv->glink_state.handle = glink_register_link_state_cb(&link_info, |
| 668 | wpriv); |
| 669 | if (!wpriv->glink_state.handle) { |
| 670 | dev_err(wpriv->dev, "%s: Unable to register wdsp link state\n", |
| 671 | __func__); |
| 672 | ret = -EINVAL; |
| 673 | goto err_ch_mem; |
| 674 | } |
| 675 | goto done; |
| 676 | |
| 677 | err_ch_mem: |
| 678 | for (j = 0; j < i; j++) { |
| 679 | mutex_destroy(&ch[j]->mutex); |
| 680 | kfree(wpriv->ch[j]); |
| 681 | wpriv->ch[j] = NULL; |
| 682 | } |
| 683 | kfree(wpriv->ch); |
| 684 | wpriv->ch = NULL; |
| 685 | wpriv->no_of_channels = 0; |
| 686 | |
| 687 | done: |
| 688 | mutex_unlock(&wpriv->glink_mutex); |
| 689 | return ret; |
| 690 | } |
| 691 | |
| 692 | /* |
| 693 | * wdsp_glink_tx_buf_work - Work queue function to send tx buffer to glink |
| 694 | * work: Work structure |
| 695 | */ |
| 696 | static void wdsp_glink_tx_buf_work(struct work_struct *work) |
| 697 | { |
| 698 | struct wdsp_glink_priv *wpriv; |
| 699 | struct wdsp_glink_ch *ch; |
| 700 | struct wdsp_glink_tx_buf *tx_buf; |
| 701 | struct wdsp_write_pkt *wpkt; |
| 702 | struct wdsp_cmd_pkt *cpkt; |
| 703 | int ret = 0; |
| 704 | |
| 705 | tx_buf = container_of(work, struct wdsp_glink_tx_buf, |
| 706 | tx_work); |
| 707 | ch = tx_buf->ch; |
| 708 | wpriv = ch->wpriv; |
| 709 | wpkt = (struct wdsp_write_pkt *)tx_buf->buf; |
| 710 | cpkt = (struct wdsp_cmd_pkt *)wpkt->payload; |
| 711 | dev_dbg(wpriv->dev, "%s: ch name = %s, payload size = %d\n", |
| 712 | __func__, cpkt->ch_name, cpkt->payload_size); |
| 713 | |
| 714 | mutex_lock(&tx_buf->ch->mutex); |
| 715 | if (ch->channel_state == GLINK_CONNECTED) { |
| 716 | mutex_unlock(&tx_buf->ch->mutex); |
| 717 | ret = glink_tx(ch->handle, tx_buf, |
| 718 | cpkt->payload, cpkt->payload_size, |
| 719 | GLINK_TX_REQ_INTENT); |
| 720 | if (ret < 0) { |
| 721 | dev_err(wpriv->dev, "%s: glink tx failed, ret = %d\n", |
| 722 | __func__, ret); |
| 723 | /* |
| 724 | * If glink_tx() is failed then free tx_buf here as |
| 725 | * there won't be any tx_done notification to |
| 726 | * free the buffer. |
| 727 | */ |
| 728 | vfree(tx_buf); |
| 729 | } |
| 730 | } else { |
| 731 | mutex_unlock(&tx_buf->ch->mutex); |
| 732 | dev_err(wpriv->dev, "%s: channel %s is not in connected state\n", |
| 733 | __func__, ch->ch_cfg.name); |
| 734 | /* |
| 735 | * Free tx_buf here as there won't be any tx_done |
| 736 | * notification in this case also. |
| 737 | */ |
| 738 | vfree(tx_buf); |
| 739 | } |
| 740 | } |
| 741 | |
| 742 | /* |
| 743 | * wdsp_glink_read - Read API to send the data to userspace |
| 744 | * file: Pointer to the file structure |
| 745 | * buf: Pointer to the userspace buffer |
| 746 | * count: Number bytes to read from the file |
| 747 | * ppos: Pointer to the position into the file |
| 748 | */ |
| 749 | static ssize_t wdsp_glink_read(struct file *file, char __user *buf, |
| 750 | size_t count, loff_t *ppos) |
| 751 | { |
| 752 | int ret = 0, ret1 = 0; |
| 753 | struct wdsp_glink_rsp_que *rsp; |
| 754 | struct wdsp_glink_priv *wpriv; |
| 755 | |
| 756 | wpriv = (struct wdsp_glink_priv *)file->private_data; |
| 757 | if (!wpriv) { |
| 758 | pr_err("%s: Invalid private data\n", __func__); |
| 759 | ret = -EINVAL; |
| 760 | goto done; |
| 761 | } |
| 762 | |
| 763 | if (count > WDSP_MAX_READ_SIZE) { |
Vidyakumar Athota | 60871bd | 2017-09-08 11:26:51 -0700 | [diff] [blame] | 764 | dev_info_ratelimited(wpriv->dev, "%s: count = %zd is more than WDSP_MAX_READ_SIZE\n", |
Laxminath Kasam | d1f3619 | 2017-08-03 18:54:01 +0530 | [diff] [blame] | 765 | __func__, count); |
| 766 | count = WDSP_MAX_READ_SIZE; |
| 767 | } |
| 768 | /* |
| 769 | * Complete signal has given from glink rx notification callback |
| 770 | * or from flush API. Also use interruptible wait_for_completion API |
| 771 | * to allow the system to go in suspend. |
| 772 | */ |
| 773 | ret = wait_for_completion_interruptible(&wpriv->rsp_complete); |
| 774 | if (ret) |
| 775 | goto done; |
| 776 | |
| 777 | mutex_lock(&wpriv->rsp_mutex); |
| 778 | if (wpriv->rsp_cnt) { |
| 779 | wpriv->rsp_cnt--; |
| 780 | dev_dbg(wpriv->dev, "%s: read from buffer %d\n", |
| 781 | __func__, wpriv->rsp_cnt); |
| 782 | |
| 783 | rsp = &wpriv->rsp[wpriv->rsp_cnt]; |
| 784 | if (count < rsp->buf_size) { |
| 785 | ret1 = copy_to_user(buf, &rsp->buf, count); |
| 786 | /* Return the number of bytes copied */ |
| 787 | ret = count; |
| 788 | } else { |
| 789 | ret1 = copy_to_user(buf, &rsp->buf, rsp->buf_size); |
| 790 | /* Return the number of bytes copied */ |
| 791 | ret = rsp->buf_size; |
| 792 | } |
| 793 | |
| 794 | if (ret1) { |
| 795 | mutex_unlock(&wpriv->rsp_mutex); |
Vidyakumar Athota | 60871bd | 2017-09-08 11:26:51 -0700 | [diff] [blame] | 796 | dev_err_ratelimited(wpriv->dev, "%s: copy_to_user failed %d\n", |
Laxminath Kasam | d1f3619 | 2017-08-03 18:54:01 +0530 | [diff] [blame] | 797 | __func__, ret); |
| 798 | ret = -EFAULT; |
| 799 | goto done; |
| 800 | } |
| 801 | } else { |
| 802 | /* |
| 803 | * This will execute only if flush API is called or |
| 804 | * something wrong with ref_cnt |
| 805 | */ |
| 806 | dev_dbg(wpriv->dev, "%s: resp count = %d\n", __func__, |
| 807 | wpriv->rsp_cnt); |
| 808 | ret = -EINVAL; |
| 809 | } |
| 810 | mutex_unlock(&wpriv->rsp_mutex); |
| 811 | |
| 812 | done: |
| 813 | return ret; |
| 814 | } |
| 815 | |
| 816 | /* |
| 817 | * wdsp_glink_write - Write API to receive the data from userspace |
| 818 | * file: Pointer to the file structure |
| 819 | * buf: Pointer to the userspace buffer |
| 820 | * count: Number bytes to read from the file |
| 821 | * ppos: Pointer to the position into the file |
| 822 | */ |
| 823 | static ssize_t wdsp_glink_write(struct file *file, const char __user *buf, |
| 824 | size_t count, loff_t *ppos) |
| 825 | { |
| 826 | int ret = 0, i, tx_buf_size; |
| 827 | struct wdsp_write_pkt *wpkt; |
| 828 | struct wdsp_cmd_pkt *cpkt; |
| 829 | struct wdsp_glink_tx_buf *tx_buf; |
| 830 | struct wdsp_glink_priv *wpriv; |
| 831 | size_t pkt_max_size; |
| 832 | |
| 833 | wpriv = (struct wdsp_glink_priv *)file->private_data; |
| 834 | if (!wpriv) { |
| 835 | pr_err("%s: Invalid private data\n", __func__); |
| 836 | ret = -EINVAL; |
| 837 | goto done; |
| 838 | } |
| 839 | |
| 840 | if ((count < WDSP_WRITE_PKT_SIZE) || |
| 841 | (count > WDSP_MAX_WRITE_SIZE)) { |
Vidyakumar Athota | 60871bd | 2017-09-08 11:26:51 -0700 | [diff] [blame] | 842 | dev_err_ratelimited(wpriv->dev, "%s: Invalid count = %zd\n", |
Laxminath Kasam | d1f3619 | 2017-08-03 18:54:01 +0530 | [diff] [blame] | 843 | __func__, count); |
| 844 | ret = -EINVAL; |
| 845 | goto done; |
| 846 | } |
| 847 | |
| 848 | dev_dbg(wpriv->dev, "%s: count = %zd\n", __func__, count); |
| 849 | |
| 850 | tx_buf_size = count + sizeof(struct wdsp_glink_tx_buf); |
| 851 | tx_buf = vzalloc(tx_buf_size); |
| 852 | if (!tx_buf) { |
| 853 | ret = -ENOMEM; |
| 854 | goto done; |
| 855 | } |
| 856 | |
| 857 | ret = copy_from_user(tx_buf->buf, buf, count); |
| 858 | if (ret) { |
Vidyakumar Athota | 60871bd | 2017-09-08 11:26:51 -0700 | [diff] [blame] | 859 | dev_err_ratelimited(wpriv->dev, "%s: copy_from_user failed %d\n", |
Laxminath Kasam | d1f3619 | 2017-08-03 18:54:01 +0530 | [diff] [blame] | 860 | __func__, ret); |
| 861 | ret = -EFAULT; |
| 862 | goto free_buf; |
| 863 | } |
| 864 | |
| 865 | wpkt = (struct wdsp_write_pkt *)tx_buf->buf; |
| 866 | switch (wpkt->pkt_type) { |
| 867 | case WDSP_REG_PKT: |
| 868 | if (count < (WDSP_WRITE_PKT_SIZE + WDSP_REG_PKT_SIZE + |
| 869 | WDSP_CH_CFG_SIZE)) { |
Vidyakumar Athota | 60871bd | 2017-09-08 11:26:51 -0700 | [diff] [blame] | 870 | dev_err_ratelimited(wpriv->dev, "%s: Invalid reg pkt size = %zd\n", |
Laxminath Kasam | d1f3619 | 2017-08-03 18:54:01 +0530 | [diff] [blame] | 871 | __func__, count); |
| 872 | ret = -EINVAL; |
| 873 | goto free_buf; |
| 874 | } |
| 875 | ret = wdsp_glink_ch_info_init(wpriv, |
| 876 | (struct wdsp_reg_pkt *)wpkt->payload, |
| 877 | count); |
| 878 | if (ret < 0) |
Vidyakumar Athota | 60871bd | 2017-09-08 11:26:51 -0700 | [diff] [blame] | 879 | dev_err_ratelimited(wpriv->dev, "%s: glink register failed, ret = %d\n", |
Laxminath Kasam | d1f3619 | 2017-08-03 18:54:01 +0530 | [diff] [blame] | 880 | __func__, ret); |
| 881 | vfree(tx_buf); |
| 882 | break; |
| 883 | case WDSP_READY_PKT: |
| 884 | ret = wait_event_timeout(wpriv->link_state_wait, |
| 885 | (wpriv->glink_state.link_state == |
| 886 | GLINK_LINK_STATE_UP), |
| 887 | msecs_to_jiffies(TIMEOUT_MS)); |
| 888 | if (!ret) { |
Vidyakumar Athota | 60871bd | 2017-09-08 11:26:51 -0700 | [diff] [blame] | 889 | dev_err_ratelimited(wpriv->dev, "%s: Link state wait timeout\n", |
Laxminath Kasam | d1f3619 | 2017-08-03 18:54:01 +0530 | [diff] [blame] | 890 | __func__); |
| 891 | ret = -ETIMEDOUT; |
| 892 | goto free_buf; |
| 893 | } |
| 894 | ret = 0; |
| 895 | vfree(tx_buf); |
| 896 | break; |
| 897 | case WDSP_CMD_PKT: |
| 898 | if (count <= (WDSP_WRITE_PKT_SIZE + WDSP_CMD_PKT_SIZE)) { |
Vidyakumar Athota | 60871bd | 2017-09-08 11:26:51 -0700 | [diff] [blame] | 899 | dev_err_ratelimited(wpriv->dev, "%s: Invalid cmd pkt size = %zd\n", |
Laxminath Kasam | d1f3619 | 2017-08-03 18:54:01 +0530 | [diff] [blame] | 900 | __func__, count); |
| 901 | ret = -EINVAL; |
| 902 | goto free_buf; |
| 903 | } |
| 904 | mutex_lock(&wpriv->glink_mutex); |
| 905 | if (wpriv->glink_state.link_state == GLINK_LINK_STATE_DOWN) { |
| 906 | mutex_unlock(&wpriv->glink_mutex); |
Vidyakumar Athota | 60871bd | 2017-09-08 11:26:51 -0700 | [diff] [blame] | 907 | dev_err_ratelimited(wpriv->dev, "%s: Link state is Down\n", |
Laxminath Kasam | d1f3619 | 2017-08-03 18:54:01 +0530 | [diff] [blame] | 908 | __func__); |
| 909 | |
| 910 | ret = -ENETRESET; |
| 911 | goto free_buf; |
| 912 | } |
| 913 | mutex_unlock(&wpriv->glink_mutex); |
| 914 | cpkt = (struct wdsp_cmd_pkt *)wpkt->payload; |
| 915 | pkt_max_size = sizeof(struct wdsp_write_pkt) + |
| 916 | sizeof(struct wdsp_cmd_pkt) + |
| 917 | cpkt->payload_size; |
| 918 | if (count < pkt_max_size) { |
Vidyakumar Athota | 60871bd | 2017-09-08 11:26:51 -0700 | [diff] [blame] | 919 | dev_err_ratelimited(wpriv->dev, "%s: Invalid cmd pkt count = %zd, pkt_size = %zd\n", |
Laxminath Kasam | d1f3619 | 2017-08-03 18:54:01 +0530 | [diff] [blame] | 920 | __func__, count, pkt_max_size); |
| 921 | ret = -EINVAL; |
| 922 | goto free_buf; |
| 923 | } |
Laxminath Kasam | d1f3619 | 2017-08-03 18:54:01 +0530 | [diff] [blame] | 924 | for (i = 0; i < wpriv->no_of_channels; i++) { |
| 925 | if (wpriv->ch && wpriv->ch[i] && |
| 926 | (!strcmp(cpkt->ch_name, |
| 927 | wpriv->ch[i]->ch_cfg.name))) { |
| 928 | tx_buf->ch = wpriv->ch[i]; |
| 929 | break; |
| 930 | } |
| 931 | } |
| 932 | if (!tx_buf->ch) { |
Vidyakumar Athota | 60871bd | 2017-09-08 11:26:51 -0700 | [diff] [blame] | 933 | dev_err_ratelimited(wpriv->dev, "%s: Failed to get glink channel\n", |
Laxminath Kasam | d1f3619 | 2017-08-03 18:54:01 +0530 | [diff] [blame] | 934 | __func__); |
| 935 | ret = -EINVAL; |
| 936 | goto free_buf; |
| 937 | } |
Vidyakumar Athota | 87c83b7 | 2017-09-19 12:06:46 -0700 | [diff] [blame^] | 938 | dev_dbg(wpriv->dev, "%s: requested ch_name: %s, pkt_size: %zd\n", |
| 939 | __func__, cpkt->ch_name, pkt_max_size); |
Laxminath Kasam | d1f3619 | 2017-08-03 18:54:01 +0530 | [diff] [blame] | 940 | |
| 941 | ret = wait_event_timeout(tx_buf->ch->ch_connect_wait, |
| 942 | (tx_buf->ch->channel_state == |
| 943 | GLINK_CONNECTED), |
| 944 | msecs_to_jiffies(TIMEOUT_MS)); |
| 945 | if (!ret) { |
Vidyakumar Athota | 60871bd | 2017-09-08 11:26:51 -0700 | [diff] [blame] | 946 | dev_err_ratelimited(wpriv->dev, "%s: glink channel %s is not in connected state %d\n", |
Laxminath Kasam | d1f3619 | 2017-08-03 18:54:01 +0530 | [diff] [blame] | 947 | __func__, tx_buf->ch->ch_cfg.name, |
| 948 | tx_buf->ch->channel_state); |
| 949 | ret = -ETIMEDOUT; |
| 950 | goto free_buf; |
| 951 | } |
| 952 | ret = 0; |
| 953 | |
| 954 | INIT_WORK(&tx_buf->tx_work, wdsp_glink_tx_buf_work); |
| 955 | queue_work(wpriv->work_queue, &tx_buf->tx_work); |
| 956 | break; |
| 957 | default: |
Vidyakumar Athota | 60871bd | 2017-09-08 11:26:51 -0700 | [diff] [blame] | 958 | dev_err_ratelimited(wpriv->dev, "%s: Invalid packet type\n", |
| 959 | __func__); |
Laxminath Kasam | d1f3619 | 2017-08-03 18:54:01 +0530 | [diff] [blame] | 960 | ret = -EINVAL; |
| 961 | vfree(tx_buf); |
| 962 | break; |
| 963 | } |
| 964 | goto done; |
| 965 | |
| 966 | free_buf: |
| 967 | vfree(tx_buf); |
| 968 | |
| 969 | done: |
| 970 | return ret; |
| 971 | } |
| 972 | |
| 973 | /* |
| 974 | * wdsp_glink_open - Open API to initialize private data |
| 975 | * inode: Pointer to the inode structure |
| 976 | * file: Pointer to the file structure |
| 977 | */ |
| 978 | static int wdsp_glink_open(struct inode *inode, struct file *file) |
| 979 | { |
| 980 | int ret = 0; |
| 981 | struct wdsp_glink_priv *wpriv; |
| 982 | struct wdsp_glink_dev *wdev; |
| 983 | |
| 984 | if (!inode->i_cdev) { |
| 985 | pr_err("%s: cdev is NULL\n", __func__); |
| 986 | ret = -EINVAL; |
| 987 | goto done; |
| 988 | } |
| 989 | wdev = container_of(inode->i_cdev, struct wdsp_glink_dev, cdev); |
| 990 | |
| 991 | wpriv = kzalloc(sizeof(struct wdsp_glink_priv), GFP_KERNEL); |
| 992 | if (!wpriv) { |
| 993 | ret = -ENOMEM; |
| 994 | goto done; |
| 995 | } |
| 996 | wpriv->dev = wdev->dev; |
| 997 | wpriv->work_queue = create_singlethread_workqueue("wdsp_glink_wq"); |
| 998 | if (!wpriv->work_queue) { |
| 999 | dev_err(wpriv->dev, "%s: Error creating wdsp_glink_wq\n", |
| 1000 | __func__); |
| 1001 | ret = -EINVAL; |
| 1002 | goto err_wq; |
| 1003 | } |
| 1004 | |
Vidyakumar Athota | 60871bd | 2017-09-08 11:26:51 -0700 | [diff] [blame] | 1005 | wpriv->glink_state.link_state = GLINK_LINK_STATE_DOWN; |
Laxminath Kasam | d1f3619 | 2017-08-03 18:54:01 +0530 | [diff] [blame] | 1006 | init_completion(&wpriv->rsp_complete); |
| 1007 | init_waitqueue_head(&wpriv->link_state_wait); |
| 1008 | mutex_init(&wpriv->rsp_mutex); |
| 1009 | mutex_init(&wpriv->glink_mutex); |
| 1010 | file->private_data = wpriv; |
| 1011 | |
| 1012 | goto done; |
| 1013 | |
| 1014 | err_wq: |
| 1015 | kfree(wpriv); |
| 1016 | |
| 1017 | done: |
| 1018 | return ret; |
| 1019 | } |
| 1020 | |
| 1021 | /* |
| 1022 | * wdsp_glink_flush - Flush API to unblock read. |
| 1023 | * file: Pointer to the file structure |
| 1024 | * id: Lock owner ID |
| 1025 | */ |
| 1026 | static int wdsp_glink_flush(struct file *file, fl_owner_t id) |
| 1027 | { |
| 1028 | struct wdsp_glink_priv *wpriv; |
| 1029 | |
| 1030 | wpriv = (struct wdsp_glink_priv *)file->private_data; |
| 1031 | if (!wpriv) { |
| 1032 | pr_err("%s: Invalid private data\n", __func__); |
| 1033 | return -EINVAL; |
| 1034 | } |
| 1035 | |
| 1036 | complete(&wpriv->rsp_complete); |
| 1037 | |
| 1038 | return 0; |
| 1039 | } |
| 1040 | |
| 1041 | /* |
| 1042 | * wdsp_glink_release - Release API to clean up resources. |
| 1043 | * Whenever a file structure is shared across multiple threads, |
| 1044 | * release won't be invoked until all copies are closed |
| 1045 | * (file->f_count.counter should be 0). If we need to flush pending |
| 1046 | * data when any copy is closed, you should implement the flush method. |
| 1047 | * |
| 1048 | * inode: Pointer to the inode structure |
| 1049 | * file: Pointer to the file structure |
| 1050 | */ |
| 1051 | static int wdsp_glink_release(struct inode *inode, struct file *file) |
| 1052 | { |
| 1053 | int i, ret = 0; |
| 1054 | struct wdsp_glink_priv *wpriv; |
| 1055 | |
| 1056 | wpriv = (struct wdsp_glink_priv *)file->private_data; |
| 1057 | if (!wpriv) { |
| 1058 | pr_err("%s: Invalid private data\n", __func__); |
| 1059 | ret = -EINVAL; |
| 1060 | goto done; |
| 1061 | } |
| 1062 | |
| 1063 | if (wpriv->glink_state.handle) |
| 1064 | glink_unregister_link_state_cb(wpriv->glink_state.handle); |
| 1065 | |
| 1066 | flush_workqueue(wpriv->work_queue); |
| 1067 | destroy_workqueue(wpriv->work_queue); |
| 1068 | |
| 1069 | /* |
| 1070 | * Clean up glink channel memory in channel state |
| 1071 | * callback only if close channels are called from here. |
| 1072 | */ |
| 1073 | if (wpriv->ch) { |
| 1074 | for (i = 0; i < wpriv->no_of_channels; i++) { |
| 1075 | if (wpriv->ch[i]) { |
| 1076 | wpriv->ch[i]->free_mem = true; |
| 1077 | /* |
| 1078 | * Channel handle NULL means channel is already |
| 1079 | * closed. Free the channel memory here itself. |
| 1080 | */ |
| 1081 | if (!wpriv->ch[i]->handle) { |
| 1082 | kfree(wpriv->ch[i]); |
| 1083 | wpriv->ch[i] = NULL; |
| 1084 | } else { |
| 1085 | wdsp_glink_close_ch(wpriv->ch[i]); |
| 1086 | } |
| 1087 | } |
| 1088 | } |
| 1089 | |
| 1090 | kfree(wpriv->ch); |
| 1091 | wpriv->ch = NULL; |
| 1092 | } |
| 1093 | |
| 1094 | mutex_destroy(&wpriv->glink_mutex); |
| 1095 | mutex_destroy(&wpriv->rsp_mutex); |
| 1096 | kfree(wpriv); |
| 1097 | file->private_data = NULL; |
| 1098 | |
| 1099 | done: |
| 1100 | return ret; |
| 1101 | } |
| 1102 | |
| 1103 | static const struct file_operations wdsp_glink_fops = { |
| 1104 | .owner = THIS_MODULE, |
| 1105 | .open = wdsp_glink_open, |
| 1106 | .read = wdsp_glink_read, |
| 1107 | .write = wdsp_glink_write, |
| 1108 | .flush = wdsp_glink_flush, |
| 1109 | .release = wdsp_glink_release, |
| 1110 | }; |
| 1111 | |
| 1112 | /* |
| 1113 | * wdsp_glink_probe - Driver probe to expose char device |
| 1114 | * pdev: Pointer to device tree data. |
| 1115 | */ |
| 1116 | static int wdsp_glink_probe(struct platform_device *pdev) |
| 1117 | { |
| 1118 | int ret; |
| 1119 | struct wdsp_glink_dev *wdev; |
| 1120 | |
| 1121 | wdev = devm_kzalloc(&pdev->dev, sizeof(*wdev), GFP_KERNEL); |
| 1122 | if (!wdev) { |
| 1123 | ret = -ENOMEM; |
| 1124 | goto done; |
| 1125 | } |
| 1126 | |
| 1127 | ret = alloc_chrdev_region(&wdev->dev_num, 0, MINOR_NUMBER_COUNT, |
| 1128 | WDSP_GLINK_DRIVER_NAME); |
| 1129 | if (ret < 0) { |
| 1130 | dev_err(&pdev->dev, "%s: Failed to alloc char dev, err = %d\n", |
| 1131 | __func__, ret); |
| 1132 | goto err_chrdev; |
| 1133 | } |
| 1134 | |
| 1135 | wdev->cls = class_create(THIS_MODULE, WDSP_GLINK_DRIVER_NAME); |
| 1136 | if (IS_ERR(wdev->cls)) { |
| 1137 | ret = PTR_ERR(wdev->cls); |
| 1138 | dev_err(&pdev->dev, "%s: Failed to create class, err = %d\n", |
| 1139 | __func__, ret); |
| 1140 | goto err_class; |
| 1141 | } |
| 1142 | |
| 1143 | wdev->dev = device_create(wdev->cls, NULL, wdev->dev_num, |
| 1144 | NULL, WDSP_GLINK_DRIVER_NAME); |
| 1145 | if (IS_ERR(wdev->dev)) { |
| 1146 | ret = PTR_ERR(wdev->dev); |
| 1147 | dev_err(&pdev->dev, "%s: Failed to create device, err = %d\n", |
| 1148 | __func__, ret); |
| 1149 | goto err_dev_create; |
| 1150 | } |
| 1151 | |
| 1152 | cdev_init(&wdev->cdev, &wdsp_glink_fops); |
| 1153 | ret = cdev_add(&wdev->cdev, wdev->dev_num, MINOR_NUMBER_COUNT); |
| 1154 | if (ret < 0) { |
| 1155 | dev_err(&pdev->dev, "%s: Failed to register char dev, err = %d\n", |
| 1156 | __func__, ret); |
| 1157 | goto err_cdev_add; |
| 1158 | } |
| 1159 | platform_set_drvdata(pdev, wdev); |
| 1160 | goto done; |
| 1161 | |
| 1162 | err_cdev_add: |
| 1163 | device_destroy(wdev->cls, wdev->dev_num); |
| 1164 | |
| 1165 | err_dev_create: |
| 1166 | class_destroy(wdev->cls); |
| 1167 | |
| 1168 | err_class: |
| 1169 | unregister_chrdev_region(0, MINOR_NUMBER_COUNT); |
| 1170 | |
| 1171 | err_chrdev: |
| 1172 | devm_kfree(&pdev->dev, wdev); |
| 1173 | |
| 1174 | done: |
| 1175 | return ret; |
| 1176 | } |
| 1177 | |
| 1178 | /* |
| 1179 | * wdsp_glink_remove - Driver remove to handle cleanup |
| 1180 | * pdev: Pointer to device tree data. |
| 1181 | */ |
| 1182 | static int wdsp_glink_remove(struct platform_device *pdev) |
| 1183 | { |
| 1184 | struct wdsp_glink_dev *wdev = platform_get_drvdata(pdev); |
| 1185 | |
| 1186 | if (wdev) { |
| 1187 | cdev_del(&wdev->cdev); |
| 1188 | device_destroy(wdev->cls, wdev->dev_num); |
| 1189 | class_destroy(wdev->cls); |
| 1190 | unregister_chrdev_region(0, MINOR_NUMBER_COUNT); |
| 1191 | devm_kfree(&pdev->dev, wdev); |
| 1192 | } else { |
| 1193 | dev_err(&pdev->dev, "%s: Invalid device data\n", __func__); |
| 1194 | } |
| 1195 | |
| 1196 | return 0; |
| 1197 | } |
| 1198 | |
| 1199 | static const struct of_device_id wdsp_glink_of_match[] = { |
| 1200 | {.compatible = "qcom,wcd-dsp-glink"}, |
| 1201 | { } |
| 1202 | }; |
| 1203 | MODULE_DEVICE_TABLE(of, wdsp_glink_of_match); |
| 1204 | |
| 1205 | static struct platform_driver wdsp_glink_driver = { |
| 1206 | .probe = wdsp_glink_probe, |
| 1207 | .remove = wdsp_glink_remove, |
| 1208 | .driver = { |
| 1209 | .name = WDSP_GLINK_DRIVER_NAME, |
| 1210 | .owner = THIS_MODULE, |
| 1211 | .of_match_table = wdsp_glink_of_match, |
| 1212 | }, |
| 1213 | }; |
| 1214 | |
| 1215 | module_platform_driver(wdsp_glink_driver); |
| 1216 | |
| 1217 | MODULE_DESCRIPTION("SoC WCD_DSP GLINK Driver"); |
| 1218 | MODULE_LICENSE("GPL v2"); |