| @@ -0,0 +1,585 @@ |
| 1 | +/* |
| 2 | + * Copyright (c) 2016, Linaro Ltd. |
| 3 | + * Copyright (c) 2012, Michal Simek <monstr@monstr.eu> |
| 4 | + * Copyright (c) 2012, PetaLogix |
| 5 | + * Copyright (c) 2011, Texas Instruments, Inc. |
| 6 | + * Copyright (c) 2011, Google, Inc. |
| 7 | + * |
| 8 | + * Based on rpmsg performance statistics driver by Michal Simek, which in turn |
| 9 | + * was based on TI & Google OMX rpmsg driver. |
| 10 | + * |
| 11 | + * This program is free software; you can redistribute it and/or modify |
| 12 | + * it under the terms of the GNU General Public License version 2 and |
| 13 | + * only version 2 as published by the Free Software Foundation. |
| 14 | + * |
| 15 | + * This program is distributed in the hope that it will be useful, |
| 16 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | + * GNU General Public License for more details. |
| 19 | + */ |
| 20 | +#include <linux/cdev.h> |
| 21 | +#include <linux/device.h> |
| 22 | +#include <linux/fs.h> |
| 23 | +#include <linux/idr.h> |
| 24 | +#include <linux/kernel.h> |
| 25 | +#include <linux/module.h> |
| 26 | +#include <linux/poll.h> |
| 27 | +#include <linux/rpmsg.h> |
| 28 | +#include <linux/skbuff.h> |
| 29 | +#include <linux/slab.h> |
| 30 | +#include <linux/uaccess.h> |
| 31 | +#include <uapi/linux/rpmsg.h> |
| 32 | + |
| 33 | +#include "rpmsg_internal.h" |
| 34 | + |
| 35 | +#define RPMSG_DEV_MAX (MINORMASK + 1) |
| 36 | + |
| 37 | +static dev_t rpmsg_major; |
| 38 | +static struct class *rpmsg_class; |
| 39 | + |
| 40 | +static DEFINE_IDA(rpmsg_ctrl_ida); |
| 41 | +static DEFINE_IDA(rpmsg_ept_ida); |
| 42 | +static DEFINE_IDA(rpmsg_minor_ida); |
| 43 | + |
| 44 | +#define dev_to_eptdev(dev) container_of(dev, struct rpmsg_eptdev, dev) |
| 45 | +#define cdev_to_eptdev(i_cdev) container_of(i_cdev, struct rpmsg_eptdev, cdev) |
| 46 | + |
| 47 | +#define dev_to_ctrldev(dev) container_of(dev, struct rpmsg_ctrldev, dev) |
| 48 | +#define cdev_to_ctrldev(i_cdev) container_of(i_cdev, struct rpmsg_ctrldev, cdev) |
| 49 | + |
| 50 | +/** |
| 51 | + * struct rpmsg_ctrldev - control device for instantiating endpoint devices |
| 52 | + * @rpdev: underlaying rpmsg device |
| 53 | + * @cdev: cdev for the ctrl device |
| 54 | + * @dev: device for the ctrl device |
| 55 | + */ |
| 56 | +struct rpmsg_ctrldev { |
| 57 | + struct rpmsg_device *rpdev; |
| 58 | + struct cdev cdev; |
| 59 | + struct device dev; |
| 60 | +}; |
| 61 | + |
| 62 | +/** |
| 63 | + * struct rpmsg_eptdev - endpoint device context |
| 64 | + * @dev: endpoint device |
| 65 | + * @cdev: cdev for the endpoint device |
| 66 | + * @rpdev: underlaying rpmsg device |
| 67 | + * @chinfo: info used to open the endpoint |
| 68 | + * @ept_lock: synchronization of @ept modifications |
| 69 | + * @ept: rpmsg endpoint reference, when open |
| 70 | + * @queue_lock: synchronization of @queue operations |
| 71 | + * @queue: incoming message queue |
| 72 | + * @readq: wait object for incoming queue |
| 73 | + */ |
| 74 | +struct rpmsg_eptdev { |
| 75 | + struct device dev; |
| 76 | + struct cdev cdev; |
| 77 | + |
| 78 | + struct rpmsg_device *rpdev; |
| 79 | + struct rpmsg_channel_info chinfo; |
| 80 | + |
| 81 | + struct mutex ept_lock; |
| 82 | + struct rpmsg_endpoint *ept; |
| 83 | + |
| 84 | + spinlock_t queue_lock; |
| 85 | + struct sk_buff_head queue; |
| 86 | + wait_queue_head_t readq; |
| 87 | +}; |
| 88 | + |
| 89 | +static int rpmsg_eptdev_destroy(struct device *dev, void *data) |
| 90 | +{ |
| 91 | + struct rpmsg_eptdev *eptdev = dev_to_eptdev(dev); |
| 92 | + |
| 93 | + mutex_lock(&eptdev->ept_lock); |
| 94 | + if (eptdev->ept) { |
| 95 | + rpmsg_destroy_ept(eptdev->ept); |
| 96 | + eptdev->ept = NULL; |
| 97 | + } |
| 98 | + mutex_unlock(&eptdev->ept_lock); |
| 99 | + |
| 100 | + /* wake up any blocked readers */ |
| 101 | + wake_up_interruptible(&eptdev->readq); |
| 102 | + |
| 103 | + device_del(&eptdev->dev); |
| 104 | + put_device(&eptdev->dev); |
| 105 | + |
| 106 | + return 0; |
| 107 | +} |
| 108 | + |
| 109 | +static int rpmsg_ept_cb(struct rpmsg_device *rpdev, void *buf, int len, |
| 110 | + void *priv, u32 addr) |
| 111 | +{ |
| 112 | + struct rpmsg_eptdev *eptdev = priv; |
| 113 | + struct sk_buff *skb; |
| 114 | + |
| 115 | + skb = alloc_skb(len, GFP_ATOMIC); |
| 116 | + if (!skb) |
| 117 | + return -ENOMEM; |
| 118 | + |
| 119 | + memcpy(skb_put(skb, len), buf, len); |
| 120 | + |
| 121 | + spin_lock(&eptdev->queue_lock); |
| 122 | + skb_queue_tail(&eptdev->queue, skb); |
| 123 | + spin_unlock(&eptdev->queue_lock); |
| 124 | + |
| 125 | + /* wake up any blocking processes, waiting for new data */ |
| 126 | + wake_up_interruptible(&eptdev->readq); |
| 127 | + |
| 128 | + return 0; |
| 129 | +} |
| 130 | + |
| 131 | +static int rpmsg_eptdev_open(struct inode *inode, struct file *filp) |
| 132 | +{ |
| 133 | + struct rpmsg_eptdev *eptdev = cdev_to_eptdev(inode->i_cdev); |
| 134 | + struct rpmsg_endpoint *ept; |
| 135 | + struct rpmsg_device *rpdev = eptdev->rpdev; |
| 136 | + struct device *dev = &eptdev->dev; |
| 137 | + |
| 138 | + get_device(dev); |
| 139 | + |
| 140 | + ept = rpmsg_create_ept(rpdev, rpmsg_ept_cb, eptdev, eptdev->chinfo); |
| 141 | + if (!ept) { |
| 142 | + dev_err(dev, "failed to open %s\n", eptdev->chinfo.name); |
| 143 | + put_device(dev); |
| 144 | + return -EINVAL; |
| 145 | + } |
| 146 | + |
| 147 | + eptdev->ept = ept; |
| 148 | + filp->private_data = eptdev; |
| 149 | + |
| 150 | + return 0; |
| 151 | +} |
| 152 | + |
| 153 | +static int rpmsg_eptdev_release(struct inode *inode, struct file *filp) |
| 154 | +{ |
| 155 | + struct rpmsg_eptdev *eptdev = cdev_to_eptdev(inode->i_cdev); |
| 156 | + struct device *dev = &eptdev->dev; |
| 157 | + struct sk_buff *skb; |
| 158 | + |
| 159 | + /* Close the endpoint, if it's not already destroyed by the parent */ |
| 160 | + mutex_lock(&eptdev->ept_lock); |
| 161 | + if (eptdev->ept) { |
| 162 | + rpmsg_destroy_ept(eptdev->ept); |
| 163 | + eptdev->ept = NULL; |
| 164 | + } |
| 165 | + mutex_unlock(&eptdev->ept_lock); |
| 166 | + |
| 167 | + /* Discard all SKBs */ |
| 168 | + while (!skb_queue_empty(&eptdev->queue)) { |
| 169 | + skb = skb_dequeue(&eptdev->queue); |
| 170 | + kfree_skb(skb); |
| 171 | + } |
| 172 | + |
| 173 | + put_device(dev); |
| 174 | + |
| 175 | + return 0; |
| 176 | +} |
| 177 | + |
| 178 | +static ssize_t rpmsg_eptdev_read(struct file *filp, char __user *buf, |
| 179 | + size_t len, loff_t *f_pos) |
| 180 | +{ |
| 181 | + struct rpmsg_eptdev *eptdev = filp->private_data; |
| 182 | + unsigned long flags; |
| 183 | + struct sk_buff *skb; |
| 184 | + int use; |
| 185 | + |
| 186 | + if (!eptdev->ept) |
| 187 | + return -EPIPE; |
| 188 | + |
| 189 | + spin_lock_irqsave(&eptdev->queue_lock, flags); |
| 190 | + |
| 191 | + /* Wait for data in the queue */ |
| 192 | + if (skb_queue_empty(&eptdev->queue)) { |
| 193 | + spin_unlock_irqrestore(&eptdev->queue_lock, flags); |
| 194 | + |
| 195 | + if (filp->f_flags & O_NONBLOCK) |
| 196 | + return -EAGAIN; |
| 197 | + |
| 198 | + /* Wait until we get data or the endpoint goes away */ |
| 199 | + if (wait_event_interruptible(eptdev->readq, |
| 200 | + !skb_queue_empty(&eptdev->queue) || |
| 201 | + !eptdev->ept)) |
| 202 | + return -ERESTARTSYS; |
| 203 | + |
| 204 | + /* We lost the endpoint while waiting */ |
| 205 | + if (!eptdev->ept) |
| 206 | + return -EPIPE; |
| 207 | + |
| 208 | + spin_lock_irqsave(&eptdev->queue_lock, flags); |
| 209 | + } |
| 210 | + |
| 211 | + skb = skb_dequeue(&eptdev->queue); |
| 212 | + if (!skb) |
| 213 | + return -EFAULT; |
| 214 | + |
| 215 | + spin_unlock_irqrestore(&eptdev->queue_lock, flags); |
| 216 | + |
| 217 | + use = min_t(size_t, len, skb->len); |
| 218 | + if (copy_to_user(buf, skb->data, use)) |
| 219 | + use = -EFAULT; |
| 220 | + |
| 221 | + kfree_skb(skb); |
| 222 | + |
| 223 | + return use; |
| 224 | +} |
| 225 | + |
| 226 | +static ssize_t rpmsg_eptdev_write(struct file *filp, const char __user *buf, |
| 227 | + size_t len, loff_t *f_pos) |
| 228 | +{ |
| 229 | + struct rpmsg_eptdev *eptdev = filp->private_data; |
| 230 | + void *kbuf; |
| 231 | + int ret; |
| 232 | + |
| 233 | + kbuf = memdup_user(buf, len); |
| 234 | + if (IS_ERR(kbuf)) |
| 235 | + return PTR_ERR(kbuf); |
| 236 | + |
| 237 | + if (mutex_lock_interruptible(&eptdev->ept_lock)) { |
| 238 | + ret = -ERESTARTSYS; |
| 239 | + goto free_kbuf; |
| 240 | + } |
| 241 | + |
| 242 | + if (!eptdev->ept) { |
| 243 | + ret = -EPIPE; |
| 244 | + goto unlock_eptdev; |
| 245 | + } |
| 246 | + |
| 247 | + if (filp->f_flags & O_NONBLOCK) |
| 248 | + ret = rpmsg_trysend(eptdev->ept, kbuf, len); |
| 249 | + else |
| 250 | + ret = rpmsg_send(eptdev->ept, kbuf, len); |
| 251 | + |
| 252 | +unlock_eptdev: |
| 253 | + mutex_unlock(&eptdev->ept_lock); |
| 254 | + |
| 255 | +free_kbuf: |
| 256 | + kfree(kbuf); |
| 257 | + return ret < 0 ? ret : len; |
| 258 | +} |
| 259 | + |
| 260 | +static unsigned int rpmsg_eptdev_poll(struct file *filp, poll_table *wait) |
| 261 | +{ |
| 262 | + struct rpmsg_eptdev *eptdev = filp->private_data; |
| 263 | + unsigned int mask = 0; |
| 264 | + |
| 265 | + if (!eptdev->ept) |
| 266 | + return POLLERR; |
| 267 | + |
| 268 | + poll_wait(filp, &eptdev->readq, wait); |
| 269 | + |
| 270 | + if (!skb_queue_empty(&eptdev->queue)) |
| 271 | + mask |= POLLIN | POLLRDNORM; |
| 272 | + |
| 273 | + mask |= rpmsg_poll(eptdev->ept, filp, wait); |
| 274 | + |
| 275 | + return mask; |
| 276 | +} |
| 277 | + |
| 278 | +static long rpmsg_eptdev_ioctl(struct file *fp, unsigned int cmd, |
| 279 | + unsigned long arg) |
| 280 | +{ |
| 281 | + struct rpmsg_eptdev *eptdev = fp->private_data; |
| 282 | + |
| 283 | + if (cmd != RPMSG_DESTROY_EPT_IOCTL) |
| 284 | + return -EINVAL; |
| 285 | + |
| 286 | + return rpmsg_eptdev_destroy(&eptdev->dev, NULL); |
| 287 | +} |
| 288 | + |
| 289 | +static const struct file_operations rpmsg_eptdev_fops = { |
| 290 | + .owner = THIS_MODULE, |
| 291 | + .open = rpmsg_eptdev_open, |
| 292 | + .release = rpmsg_eptdev_release, |
| 293 | + .read = rpmsg_eptdev_read, |
| 294 | + .write = rpmsg_eptdev_write, |
| 295 | + .poll = rpmsg_eptdev_poll, |
| 296 | + .unlocked_ioctl = rpmsg_eptdev_ioctl, |
| 297 | +}; |
| 298 | + |
| 299 | +static ssize_t name_show(struct device *dev, struct device_attribute *attr, |
| 300 | + char *buf) |
| 301 | +{ |
| 302 | + struct rpmsg_eptdev *eptdev = dev_get_drvdata(dev); |
| 303 | + |
| 304 | + return sprintf(buf, "%s\n", eptdev->chinfo.name); |
| 305 | +} |
| 306 | +static DEVICE_ATTR_RO(name); |
| 307 | + |
| 308 | +static ssize_t src_show(struct device *dev, struct device_attribute *attr, |
| 309 | + char *buf) |
| 310 | +{ |
| 311 | + struct rpmsg_eptdev *eptdev = dev_get_drvdata(dev); |
| 312 | + |
| 313 | + return sprintf(buf, "%d\n", eptdev->chinfo.src); |
| 314 | +} |
| 315 | +static DEVICE_ATTR_RO(src); |
| 316 | + |
| 317 | +static ssize_t dst_show(struct device *dev, struct device_attribute *attr, |
| 318 | + char *buf) |
| 319 | +{ |
| 320 | + struct rpmsg_eptdev *eptdev = dev_get_drvdata(dev); |
| 321 | + |
| 322 | + return sprintf(buf, "%d\n", eptdev->chinfo.dst); |
| 323 | +} |
| 324 | +static DEVICE_ATTR_RO(dst); |
| 325 | + |
| 326 | +static struct attribute *rpmsg_eptdev_attrs[] = { |
| 327 | + &dev_attr_name.attr, |
| 328 | + &dev_attr_src.attr, |
| 329 | + &dev_attr_dst.attr, |
| 330 | + NULL |
| 331 | +}; |
| 332 | +ATTRIBUTE_GROUPS(rpmsg_eptdev); |
| 333 | + |
| 334 | +static void rpmsg_eptdev_release_device(struct device *dev) |
| 335 | +{ |
| 336 | + struct rpmsg_eptdev *eptdev = dev_to_eptdev(dev); |
| 337 | + |
| 338 | + ida_simple_remove(&rpmsg_ept_ida, dev->id); |
| 339 | + ida_simple_remove(&rpmsg_minor_ida, MINOR(eptdev->dev.devt)); |
| 340 | + cdev_del(&eptdev->cdev); |
| 341 | + kfree(eptdev); |
| 342 | +} |
| 343 | + |
| 344 | +static int rpmsg_eptdev_create(struct rpmsg_ctrldev *ctrldev, |
| 345 | + struct rpmsg_channel_info chinfo) |
| 346 | +{ |
| 347 | + struct rpmsg_device *rpdev = ctrldev->rpdev; |
| 348 | + struct rpmsg_eptdev *eptdev; |
| 349 | + struct device *dev; |
| 350 | + int ret; |
| 351 | + |
| 352 | + eptdev = kzalloc(sizeof(*eptdev), GFP_KERNEL); |
| 353 | + if (!eptdev) |
| 354 | + return -ENOMEM; |
| 355 | + |
| 356 | + dev = &eptdev->dev; |
| 357 | + eptdev->rpdev = rpdev; |
| 358 | + eptdev->chinfo = chinfo; |
| 359 | + |
| 360 | + mutex_init(&eptdev->ept_lock); |
| 361 | + spin_lock_init(&eptdev->queue_lock); |
| 362 | + skb_queue_head_init(&eptdev->queue); |
| 363 | + init_waitqueue_head(&eptdev->readq); |
| 364 | + |
| 365 | + device_initialize(dev); |
| 366 | + dev->class = rpmsg_class; |
| 367 | + dev->parent = &ctrldev->dev; |
| 368 | + dev->groups = rpmsg_eptdev_groups; |
| 369 | + dev_set_drvdata(dev, eptdev); |
| 370 | + |
| 371 | + cdev_init(&eptdev->cdev, &rpmsg_eptdev_fops); |
| 372 | + eptdev->cdev.owner = THIS_MODULE; |
| 373 | + |
| 374 | + ret = ida_simple_get(&rpmsg_minor_ida, 0, RPMSG_DEV_MAX, GFP_KERNEL); |
| 375 | + if (ret < 0) |
| 376 | + goto free_eptdev; |
| 377 | + dev->devt = MKDEV(MAJOR(rpmsg_major), ret); |
| 378 | + |
| 379 | + ret = ida_simple_get(&rpmsg_ept_ida, 0, 0, GFP_KERNEL); |
| 380 | + if (ret < 0) |
| 381 | + goto free_minor_ida; |
| 382 | + dev->id = ret; |
| 383 | + dev_set_name(dev, "rpmsg%d", ret); |
| 384 | + |
| 385 | + ret = cdev_add(&eptdev->cdev, dev->devt, 1); |
| 386 | + if (ret) |
| 387 | + goto free_ept_ida; |
| 388 | + |
| 389 | + /* We can now rely on the release function for cleanup */ |
| 390 | + dev->release = rpmsg_eptdev_release_device; |
| 391 | + |
| 392 | + ret = device_add(dev); |
| 393 | + if (ret) { |
| 394 | + dev_err(dev, "device_register failed: %d\n", ret); |
| 395 | + put_device(dev); |
| 396 | + } |
| 397 | + |
| 398 | + return ret; |
| 399 | + |
| 400 | +free_ept_ida: |
| 401 | + ida_simple_remove(&rpmsg_ept_ida, dev->id); |
| 402 | +free_minor_ida: |
| 403 | + ida_simple_remove(&rpmsg_minor_ida, MINOR(dev->devt)); |
| 404 | +free_eptdev: |
| 405 | + put_device(dev); |
| 406 | + kfree(eptdev); |
| 407 | + |
| 408 | + return ret; |
| 409 | +} |
| 410 | + |
| 411 | +static int rpmsg_ctrldev_open(struct inode *inode, struct file *filp) |
| 412 | +{ |
| 413 | + struct rpmsg_ctrldev *ctrldev = cdev_to_ctrldev(inode->i_cdev); |
| 414 | + |
| 415 | + get_device(&ctrldev->dev); |
| 416 | + filp->private_data = ctrldev; |
| 417 | + |
| 418 | + return 0; |
| 419 | +} |
| 420 | + |
| 421 | +static int rpmsg_ctrldev_release(struct inode *inode, struct file *filp) |
| 422 | +{ |
| 423 | + struct rpmsg_ctrldev *ctrldev = cdev_to_ctrldev(inode->i_cdev); |
| 424 | + |
| 425 | + put_device(&ctrldev->dev); |
| 426 | + |
| 427 | + return 0; |
| 428 | +} |
| 429 | + |
| 430 | +static long rpmsg_ctrldev_ioctl(struct file *fp, unsigned int cmd, |
| 431 | + unsigned long arg) |
| 432 | +{ |
| 433 | + struct rpmsg_ctrldev *ctrldev = fp->private_data; |
| 434 | + void __user *argp = (void __user *)arg; |
| 435 | + struct rpmsg_endpoint_info eptinfo; |
| 436 | + struct rpmsg_channel_info chinfo; |
| 437 | + |
| 438 | + if (cmd != RPMSG_CREATE_EPT_IOCTL) |
| 439 | + return -EINVAL; |
| 440 | + |
| 441 | + if (copy_from_user(&eptinfo, argp, sizeof(eptinfo))) |
| 442 | + return -EFAULT; |
| 443 | + |
| 444 | + memcpy(chinfo.name, eptinfo.name, RPMSG_NAME_SIZE); |
| 445 | + chinfo.name[RPMSG_NAME_SIZE-1] = '\0'; |
| 446 | + chinfo.src = eptinfo.src; |
| 447 | + chinfo.dst = eptinfo.dst; |
| 448 | + |
| 449 | + return rpmsg_eptdev_create(ctrldev, chinfo); |
| 450 | +}; |
| 451 | + |
| 452 | +static const struct file_operations rpmsg_ctrldev_fops = { |
| 453 | + .owner = THIS_MODULE, |
| 454 | + .open = rpmsg_ctrldev_open, |
| 455 | + .release = rpmsg_ctrldev_release, |
| 456 | + .unlocked_ioctl = rpmsg_ctrldev_ioctl, |
| 457 | +}; |
| 458 | + |
| 459 | +static void rpmsg_ctrldev_release_device(struct device *dev) |
| 460 | +{ |
| 461 | + struct rpmsg_ctrldev *ctrldev = dev_to_ctrldev(dev); |
| 462 | + |
| 463 | + ida_simple_remove(&rpmsg_ctrl_ida, dev->id); |
| 464 | + ida_simple_remove(&rpmsg_minor_ida, MINOR(dev->devt)); |
| 465 | + cdev_del(&ctrldev->cdev); |
| 466 | + kfree(ctrldev); |
| 467 | +} |
| 468 | + |
| 469 | +static int rpmsg_chrdev_probe(struct rpmsg_device *rpdev) |
| 470 | +{ |
| 471 | + struct rpmsg_ctrldev *ctrldev; |
| 472 | + struct device *dev; |
| 473 | + int ret; |
| 474 | + |
| 475 | + ctrldev = kzalloc(sizeof(*ctrldev), GFP_KERNEL); |
| 476 | + if (!ctrldev) |
| 477 | + return -ENOMEM; |
| 478 | + |
| 479 | + ctrldev->rpdev = rpdev; |
| 480 | + |
| 481 | + dev = &ctrldev->dev; |
| 482 | + device_initialize(dev); |
| 483 | + dev->parent = &rpdev->dev; |
| 484 | + dev->class = rpmsg_class; |
| 485 | + |
| 486 | + cdev_init(&ctrldev->cdev, &rpmsg_ctrldev_fops); |
| 487 | + ctrldev->cdev.owner = THIS_MODULE; |
| 488 | + |
| 489 | + ret = ida_simple_get(&rpmsg_minor_ida, 0, RPMSG_DEV_MAX, GFP_KERNEL); |
| 490 | + if (ret < 0) |
| 491 | + goto free_ctrldev; |
| 492 | + dev->devt = MKDEV(MAJOR(rpmsg_major), ret); |
| 493 | + |
| 494 | + ret = ida_simple_get(&rpmsg_ctrl_ida, 0, 0, GFP_KERNEL); |
| 495 | + if (ret < 0) |
| 496 | + goto free_minor_ida; |
| 497 | + dev->id = ret; |
| 498 | + dev_set_name(&ctrldev->dev, "rpmsg_ctrl%d", ret); |
| 499 | + |
| 500 | + ret = cdev_add(&ctrldev->cdev, dev->devt, 1); |
| 501 | + if (ret) |
| 502 | + goto free_ctrl_ida; |
| 503 | + |
| 504 | + /* We can now rely on the release function for cleanup */ |
| 505 | + dev->release = rpmsg_ctrldev_release_device; |
| 506 | + |
| 507 | + ret = device_add(dev); |
| 508 | + if (ret) { |
| 509 | + dev_err(&rpdev->dev, "device_register failed: %d\n", ret); |
| 510 | + put_device(dev); |
| 511 | + } |
| 512 | + |
| 513 | + dev_set_drvdata(&rpdev->dev, ctrldev); |
| 514 | + |
| 515 | + return ret; |
| 516 | + |
| 517 | +free_ctrl_ida: |
| 518 | + ida_simple_remove(&rpmsg_ctrl_ida, dev->id); |
| 519 | +free_minor_ida: |
| 520 | + ida_simple_remove(&rpmsg_minor_ida, MINOR(dev->devt)); |
| 521 | +free_ctrldev: |
| 522 | + put_device(dev); |
| 523 | + kfree(ctrldev); |
| 524 | + |
| 525 | + return ret; |
| 526 | +} |
| 527 | + |
| 528 | +static void rpmsg_chrdev_remove(struct rpmsg_device *rpdev) |
| 529 | +{ |
| 530 | + struct rpmsg_ctrldev *ctrldev = dev_get_drvdata(&rpdev->dev); |
| 531 | + int ret; |
| 532 | + |
| 533 | + /* Destroy all endpoints */ |
| 534 | + ret = device_for_each_child(&ctrldev->dev, NULL, rpmsg_eptdev_destroy); |
| 535 | + if (ret) |
| 536 | + dev_warn(&rpdev->dev, "failed to nuke endpoints: %d\n", ret); |
| 537 | + |
| 538 | + device_del(&ctrldev->dev); |
| 539 | + put_device(&ctrldev->dev); |
| 540 | +} |
| 541 | + |
| 542 | +static struct rpmsg_driver rpmsg_chrdev_driver = { |
| 543 | + .probe = rpmsg_chrdev_probe, |
| 544 | + .remove = rpmsg_chrdev_remove, |
| 545 | + .drv = { |
| 546 | + .name = "rpmsg_chrdev", |
| 547 | + }, |
| 548 | +}; |
| 549 | + |
| 550 | +static int rpmsg_char_init(void) |
| 551 | +{ |
| 552 | + int ret; |
| 553 | + |
| 554 | + ret = alloc_chrdev_region(&rpmsg_major, 0, RPMSG_DEV_MAX, "rpmsg"); |
| 555 | + if (ret < 0) { |
| 556 | + pr_err("rpmsg: failed to allocate char dev region\n"); |
| 557 | + return ret; |
| 558 | + } |
| 559 | + |
| 560 | + rpmsg_class = class_create(THIS_MODULE, "rpmsg"); |
| 561 | + if (IS_ERR(rpmsg_class)) { |
| 562 | + pr_err("failed to create rpmsg class\n"); |
| 563 | + unregister_chrdev_region(rpmsg_major, RPMSG_DEV_MAX); |
| 564 | + return PTR_ERR(rpmsg_class); |
| 565 | + } |
| 566 | + |
| 567 | + ret = register_rpmsg_driver(&rpmsg_chrdev_driver); |
| 568 | + if (ret < 0) { |
| 569 | + pr_err("rpmsgchr: failed to register rpmsg driver\n"); |
| 570 | + class_destroy(rpmsg_class); |
| 571 | + unregister_chrdev_region(rpmsg_major, RPMSG_DEV_MAX); |
| 572 | + } |
| 573 | + |
| 574 | + return ret; |
| 575 | +} |
| 576 | +postcore_initcall(rpmsg_char_init); |
| 577 | + |
| 578 | +static void rpmsg_chrdev_exit(void) |
| 579 | +{ |
| 580 | + unregister_rpmsg_driver(&rpmsg_chrdev_driver); |
| 581 | + class_destroy(rpmsg_class); |
| 582 | + unregister_chrdev_region(rpmsg_major, RPMSG_DEV_MAX); |
| 583 | +} |
| 584 | +module_exit(rpmsg_chrdev_exit); |
| 585 | +MODULE_LICENSE("GPL v2"); |