Samuel Ortiz | e535410 | 2013-03-27 17:29:53 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Intel Management Engine Interface (Intel MEI) Linux driver |
| 3 | * Copyright (c) 2012-2013, Intel Corporation. |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify it |
| 6 | * under the terms and conditions of the GNU General Public License, |
| 7 | * version 2, as published by the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed in the hope it will be useful, but WITHOUT |
| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 12 | * more details. |
| 13 | * |
| 14 | */ |
| 15 | |
| 16 | #include <linux/module.h> |
| 17 | #include <linux/device.h> |
| 18 | #include <linux/kernel.h> |
Samuel Ortiz | 3e83329 | 2013-03-27 17:29:55 +0200 | [diff] [blame] | 19 | #include <linux/sched.h> |
Samuel Ortiz | e535410 | 2013-03-27 17:29:53 +0200 | [diff] [blame] | 20 | #include <linux/init.h> |
| 21 | #include <linux/errno.h> |
| 22 | #include <linux/slab.h> |
| 23 | #include <linux/mutex.h> |
| 24 | #include <linux/interrupt.h> |
| 25 | #include <linux/pci.h> |
| 26 | #include <linux/mei_cl_bus.h> |
| 27 | |
| 28 | #include "mei_dev.h" |
Samuel Ortiz | 3e83329 | 2013-03-27 17:29:55 +0200 | [diff] [blame] | 29 | #include "hw-me.h" |
| 30 | #include "client.h" |
Samuel Ortiz | e535410 | 2013-03-27 17:29:53 +0200 | [diff] [blame] | 31 | |
| 32 | #define to_mei_cl_driver(d) container_of(d, struct mei_cl_driver, driver) |
| 33 | #define to_mei_cl_device(d) container_of(d, struct mei_cl_device, dev) |
| 34 | |
| 35 | static int mei_cl_device_match(struct device *dev, struct device_driver *drv) |
| 36 | { |
| 37 | struct mei_cl_device *device = to_mei_cl_device(dev); |
| 38 | struct mei_cl_driver *driver = to_mei_cl_driver(drv); |
| 39 | const struct mei_cl_device_id *id; |
| 40 | |
| 41 | if (!device) |
| 42 | return 0; |
| 43 | |
| 44 | if (!driver || !driver->id_table) |
| 45 | return 0; |
| 46 | |
| 47 | id = driver->id_table; |
| 48 | |
| 49 | while (id->name[0]) { |
| 50 | if (!strcmp(dev_name(dev), id->name)) |
| 51 | return 1; |
| 52 | |
| 53 | id++; |
| 54 | } |
| 55 | |
| 56 | return 0; |
| 57 | } |
| 58 | |
| 59 | static int mei_cl_device_probe(struct device *dev) |
| 60 | { |
| 61 | struct mei_cl_device *device = to_mei_cl_device(dev); |
| 62 | struct mei_cl_driver *driver; |
| 63 | struct mei_cl_device_id id; |
| 64 | |
| 65 | if (!device) |
| 66 | return 0; |
| 67 | |
| 68 | driver = to_mei_cl_driver(dev->driver); |
| 69 | if (!driver || !driver->probe) |
| 70 | return -ENODEV; |
| 71 | |
| 72 | dev_dbg(dev, "Device probe\n"); |
| 73 | |
| 74 | strncpy(id.name, dev_name(dev), MEI_CL_NAME_SIZE); |
| 75 | |
| 76 | return driver->probe(device, &id); |
| 77 | } |
| 78 | |
| 79 | static int mei_cl_device_remove(struct device *dev) |
| 80 | { |
| 81 | struct mei_cl_device *device = to_mei_cl_device(dev); |
| 82 | struct mei_cl_driver *driver; |
| 83 | |
| 84 | if (!device || !dev->driver) |
| 85 | return 0; |
| 86 | |
Samuel Ortiz | 3e83329 | 2013-03-27 17:29:55 +0200 | [diff] [blame] | 87 | if (device->event_cb) { |
| 88 | device->event_cb = NULL; |
| 89 | cancel_work_sync(&device->event_work); |
| 90 | } |
| 91 | |
Samuel Ortiz | e535410 | 2013-03-27 17:29:53 +0200 | [diff] [blame] | 92 | driver = to_mei_cl_driver(dev->driver); |
| 93 | if (!driver->remove) { |
| 94 | dev->driver = NULL; |
| 95 | |
| 96 | return 0; |
| 97 | } |
| 98 | |
| 99 | return driver->remove(device); |
| 100 | } |
| 101 | |
| 102 | static ssize_t modalias_show(struct device *dev, struct device_attribute *a, |
| 103 | char *buf) |
| 104 | { |
| 105 | int len; |
| 106 | |
| 107 | len = snprintf(buf, PAGE_SIZE, "mei:%s\n", dev_name(dev)); |
| 108 | |
| 109 | return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len; |
| 110 | } |
| 111 | |
| 112 | static struct device_attribute mei_cl_dev_attrs[] = { |
| 113 | __ATTR_RO(modalias), |
| 114 | __ATTR_NULL, |
| 115 | }; |
| 116 | |
| 117 | static int mei_cl_uevent(struct device *dev, struct kobj_uevent_env *env) |
| 118 | { |
| 119 | if (add_uevent_var(env, "MODALIAS=mei:%s", dev_name(dev))) |
| 120 | return -ENOMEM; |
| 121 | |
| 122 | return 0; |
| 123 | } |
| 124 | |
| 125 | static struct bus_type mei_cl_bus_type = { |
| 126 | .name = "mei", |
| 127 | .dev_attrs = mei_cl_dev_attrs, |
| 128 | .match = mei_cl_device_match, |
| 129 | .probe = mei_cl_device_probe, |
| 130 | .remove = mei_cl_device_remove, |
| 131 | .uevent = mei_cl_uevent, |
| 132 | }; |
| 133 | |
| 134 | static void mei_cl_dev_release(struct device *dev) |
| 135 | { |
| 136 | kfree(to_mei_cl_device(dev)); |
| 137 | } |
| 138 | |
| 139 | static struct device_type mei_cl_device_type = { |
| 140 | .release = mei_cl_dev_release, |
| 141 | }; |
| 142 | |
Samuel Ortiz | a7b71bc | 2013-03-27 17:29:56 +0200 | [diff] [blame] | 143 | static struct mei_cl *mei_bus_find_mei_cl_by_uuid(struct mei_device *dev, |
| 144 | uuid_le uuid) |
| 145 | { |
| 146 | struct mei_cl *cl, *next; |
| 147 | |
| 148 | list_for_each_entry_safe(cl, next, &dev->device_list, device_link) { |
| 149 | if (!uuid_le_cmp(uuid, cl->device_uuid)) |
| 150 | return cl; |
| 151 | } |
| 152 | |
| 153 | return NULL; |
| 154 | } |
| 155 | struct mei_cl_device *mei_cl_add_device(struct mei_device *dev, |
Samuel Ortiz | e46980a | 2013-04-09 01:51:38 +0300 | [diff] [blame] | 156 | uuid_le uuid, char *name, |
| 157 | struct mei_cl_ops *ops) |
Samuel Ortiz | e535410 | 2013-03-27 17:29:53 +0200 | [diff] [blame] | 158 | { |
| 159 | struct mei_cl_device *device; |
Samuel Ortiz | a7b71bc | 2013-03-27 17:29:56 +0200 | [diff] [blame] | 160 | struct mei_cl *cl; |
Samuel Ortiz | e535410 | 2013-03-27 17:29:53 +0200 | [diff] [blame] | 161 | int status; |
| 162 | |
Samuel Ortiz | a7b71bc | 2013-03-27 17:29:56 +0200 | [diff] [blame] | 163 | cl = mei_bus_find_mei_cl_by_uuid(dev, uuid); |
| 164 | if (cl == NULL) |
| 165 | return NULL; |
| 166 | |
Samuel Ortiz | e535410 | 2013-03-27 17:29:53 +0200 | [diff] [blame] | 167 | device = kzalloc(sizeof(struct mei_cl_device), GFP_KERNEL); |
| 168 | if (!device) |
| 169 | return NULL; |
| 170 | |
Samuel Ortiz | a7b71bc | 2013-03-27 17:29:56 +0200 | [diff] [blame] | 171 | device->cl = cl; |
Samuel Ortiz | e46980a | 2013-04-09 01:51:38 +0300 | [diff] [blame] | 172 | device->ops = ops; |
Samuel Ortiz | a7b71bc | 2013-03-27 17:29:56 +0200 | [diff] [blame] | 173 | |
| 174 | device->dev.parent = &dev->pdev->dev; |
Samuel Ortiz | e535410 | 2013-03-27 17:29:53 +0200 | [diff] [blame] | 175 | device->dev.bus = &mei_cl_bus_type; |
| 176 | device->dev.type = &mei_cl_device_type; |
| 177 | |
| 178 | dev_set_name(&device->dev, "%s", name); |
| 179 | |
| 180 | status = device_register(&device->dev); |
Samuel Ortiz | a7b71bc | 2013-03-27 17:29:56 +0200 | [diff] [blame] | 181 | if (status) { |
| 182 | dev_err(&dev->pdev->dev, "Failed to register MEI device\n"); |
| 183 | kfree(device); |
| 184 | return NULL; |
| 185 | } |
| 186 | |
| 187 | cl->device = device; |
Samuel Ortiz | e535410 | 2013-03-27 17:29:53 +0200 | [diff] [blame] | 188 | |
| 189 | dev_dbg(&device->dev, "client %s registered\n", name); |
| 190 | |
| 191 | return device; |
Samuel Ortiz | e535410 | 2013-03-27 17:29:53 +0200 | [diff] [blame] | 192 | } |
| 193 | EXPORT_SYMBOL_GPL(mei_cl_add_device); |
| 194 | |
| 195 | void mei_cl_remove_device(struct mei_cl_device *device) |
| 196 | { |
| 197 | device_unregister(&device->dev); |
| 198 | } |
| 199 | EXPORT_SYMBOL_GPL(mei_cl_remove_device); |
Samuel Ortiz | 333e4ee | 2013-03-27 17:29:54 +0200 | [diff] [blame] | 200 | |
| 201 | int __mei_cl_driver_register(struct mei_cl_driver *driver, struct module *owner) |
| 202 | { |
| 203 | int err; |
| 204 | |
| 205 | driver->driver.name = driver->name; |
| 206 | driver->driver.owner = owner; |
| 207 | driver->driver.bus = &mei_cl_bus_type; |
| 208 | |
| 209 | err = driver_register(&driver->driver); |
| 210 | if (err) |
| 211 | return err; |
| 212 | |
| 213 | pr_debug("mei: driver [%s] registered\n", driver->driver.name); |
| 214 | |
| 215 | return 0; |
| 216 | } |
| 217 | EXPORT_SYMBOL_GPL(__mei_cl_driver_register); |
| 218 | |
| 219 | void mei_cl_driver_unregister(struct mei_cl_driver *driver) |
| 220 | { |
| 221 | driver_unregister(&driver->driver); |
| 222 | |
| 223 | pr_debug("mei: driver [%s] unregistered\n", driver->driver.name); |
| 224 | } |
| 225 | EXPORT_SYMBOL_GPL(mei_cl_driver_unregister); |
Samuel Ortiz | 3e83329 | 2013-03-27 17:29:55 +0200 | [diff] [blame] | 226 | |
Samuel Ortiz | 44d88d9 | 2013-03-27 17:29:58 +0200 | [diff] [blame] | 227 | static int ___mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length, |
| 228 | bool blocking) |
Samuel Ortiz | 3e83329 | 2013-03-27 17:29:55 +0200 | [diff] [blame] | 229 | { |
| 230 | struct mei_device *dev; |
Samuel Ortiz | 3e83329 | 2013-03-27 17:29:55 +0200 | [diff] [blame] | 231 | struct mei_cl_cb *cb; |
Tomas Winkler | 4234a6d | 2013-04-08 21:56:37 +0300 | [diff] [blame] | 232 | int id; |
| 233 | int rets; |
Samuel Ortiz | 3e83329 | 2013-03-27 17:29:55 +0200 | [diff] [blame] | 234 | |
| 235 | if (WARN_ON(!cl || !cl->dev)) |
| 236 | return -ENODEV; |
| 237 | |
Tomas Winkler | 4234a6d | 2013-04-08 21:56:37 +0300 | [diff] [blame] | 238 | dev = cl->dev; |
| 239 | |
Samuel Ortiz | 3e83329 | 2013-03-27 17:29:55 +0200 | [diff] [blame] | 240 | if (cl->state != MEI_FILE_CONNECTED) |
| 241 | return -ENODEV; |
| 242 | |
Tomas Winkler | 4234a6d | 2013-04-08 21:56:37 +0300 | [diff] [blame] | 243 | /* Check if we have an ME client device */ |
| 244 | id = mei_me_cl_by_id(dev, cl->me_client_id); |
| 245 | if (id < 0) |
| 246 | return -ENODEV; |
| 247 | |
| 248 | if (length > dev->me_clients[id].props.max_msg_length) |
| 249 | return -EINVAL; |
| 250 | |
Samuel Ortiz | 3e83329 | 2013-03-27 17:29:55 +0200 | [diff] [blame] | 251 | cb = mei_io_cb_init(cl, NULL); |
| 252 | if (!cb) |
| 253 | return -ENOMEM; |
| 254 | |
Tomas Winkler | 4234a6d | 2013-04-08 21:56:37 +0300 | [diff] [blame] | 255 | rets = mei_io_cb_alloc_req_buf(cb, length); |
| 256 | if (rets < 0) { |
Samuel Ortiz | 3e83329 | 2013-03-27 17:29:55 +0200 | [diff] [blame] | 257 | mei_io_cb_free(cb); |
Tomas Winkler | 4234a6d | 2013-04-08 21:56:37 +0300 | [diff] [blame] | 258 | return rets; |
Samuel Ortiz | 3e83329 | 2013-03-27 17:29:55 +0200 | [diff] [blame] | 259 | } |
| 260 | |
| 261 | memcpy(cb->request_buffer.data, buf, length); |
Samuel Ortiz | 3e83329 | 2013-03-27 17:29:55 +0200 | [diff] [blame] | 262 | |
| 263 | mutex_lock(&dev->device_lock); |
| 264 | |
Tomas Winkler | 4234a6d | 2013-04-08 21:56:37 +0300 | [diff] [blame] | 265 | rets = mei_cl_write(cl, cb, blocking); |
Samuel Ortiz | 3e83329 | 2013-03-27 17:29:55 +0200 | [diff] [blame] | 266 | |
| 267 | mutex_unlock(&dev->device_lock); |
Tomas Winkler | 4234a6d | 2013-04-08 21:56:37 +0300 | [diff] [blame] | 268 | if (rets < 0) |
| 269 | mei_io_cb_free(cb); |
Samuel Ortiz | 3e83329 | 2013-03-27 17:29:55 +0200 | [diff] [blame] | 270 | |
Tomas Winkler | 4234a6d | 2013-04-08 21:56:37 +0300 | [diff] [blame] | 271 | return rets; |
Samuel Ortiz | 3e83329 | 2013-03-27 17:29:55 +0200 | [diff] [blame] | 272 | } |
| 273 | |
| 274 | int __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length) |
| 275 | { |
| 276 | struct mei_device *dev; |
| 277 | struct mei_cl_cb *cb; |
| 278 | size_t r_length; |
| 279 | int err; |
| 280 | |
| 281 | if (WARN_ON(!cl || !cl->dev)) |
| 282 | return -ENODEV; |
| 283 | |
| 284 | dev = cl->dev; |
| 285 | |
| 286 | mutex_lock(&dev->device_lock); |
| 287 | |
| 288 | if (!cl->read_cb) { |
Tomas Winkler | fcb136e | 2013-04-19 22:01:35 +0300 | [diff] [blame] | 289 | err = mei_cl_read_start(cl, length); |
Samuel Ortiz | 3e83329 | 2013-03-27 17:29:55 +0200 | [diff] [blame] | 290 | if (err < 0) { |
| 291 | mutex_unlock(&dev->device_lock); |
| 292 | return err; |
| 293 | } |
| 294 | } |
| 295 | |
| 296 | if (cl->reading_state != MEI_READ_COMPLETE && |
| 297 | !waitqueue_active(&cl->rx_wait)) { |
| 298 | mutex_unlock(&dev->device_lock); |
| 299 | |
| 300 | if (wait_event_interruptible(cl->rx_wait, |
| 301 | (MEI_READ_COMPLETE == cl->reading_state))) { |
| 302 | if (signal_pending(current)) |
| 303 | return -EINTR; |
| 304 | return -ERESTARTSYS; |
| 305 | } |
| 306 | |
| 307 | mutex_lock(&dev->device_lock); |
| 308 | } |
| 309 | |
| 310 | cb = cl->read_cb; |
| 311 | |
| 312 | if (cl->reading_state != MEI_READ_COMPLETE) { |
| 313 | r_length = 0; |
| 314 | goto out; |
| 315 | } |
| 316 | |
| 317 | r_length = min_t(size_t, length, cb->buf_idx); |
| 318 | |
| 319 | memcpy(buf, cb->response_buffer.data, r_length); |
| 320 | |
| 321 | mei_io_cb_free(cb); |
| 322 | cl->reading_state = MEI_IDLE; |
| 323 | cl->read_cb = NULL; |
| 324 | |
| 325 | out: |
| 326 | mutex_unlock(&dev->device_lock); |
| 327 | |
| 328 | return r_length; |
| 329 | } |
| 330 | |
Samuel Ortiz | 44d88d9 | 2013-03-27 17:29:58 +0200 | [diff] [blame] | 331 | inline int __mei_cl_async_send(struct mei_cl *cl, u8 *buf, size_t length) |
| 332 | { |
| 333 | return ___mei_cl_send(cl, buf, length, 0); |
| 334 | } |
| 335 | |
| 336 | inline int __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length) |
| 337 | { |
| 338 | return ___mei_cl_send(cl, buf, length, 1); |
| 339 | } |
| 340 | |
Samuel Ortiz | 3e83329 | 2013-03-27 17:29:55 +0200 | [diff] [blame] | 341 | int mei_cl_send(struct mei_cl_device *device, u8 *buf, size_t length) |
| 342 | { |
Samuel Ortiz | a7b71bc | 2013-03-27 17:29:56 +0200 | [diff] [blame] | 343 | struct mei_cl *cl = device->cl; |
Samuel Ortiz | 3e83329 | 2013-03-27 17:29:55 +0200 | [diff] [blame] | 344 | |
Samuel Ortiz | a7b71bc | 2013-03-27 17:29:56 +0200 | [diff] [blame] | 345 | if (cl == NULL) |
| 346 | return -ENODEV; |
Samuel Ortiz | 3e83329 | 2013-03-27 17:29:55 +0200 | [diff] [blame] | 347 | |
| 348 | if (device->ops && device->ops->send) |
| 349 | return device->ops->send(device, buf, length); |
| 350 | |
| 351 | return __mei_cl_send(cl, buf, length); |
| 352 | } |
| 353 | EXPORT_SYMBOL_GPL(mei_cl_send); |
| 354 | |
| 355 | int mei_cl_recv(struct mei_cl_device *device, u8 *buf, size_t length) |
| 356 | { |
Samuel Ortiz | a7b71bc | 2013-03-27 17:29:56 +0200 | [diff] [blame] | 357 | struct mei_cl *cl = device->cl; |
Samuel Ortiz | 3e83329 | 2013-03-27 17:29:55 +0200 | [diff] [blame] | 358 | |
Samuel Ortiz | a7b71bc | 2013-03-27 17:29:56 +0200 | [diff] [blame] | 359 | if (cl == NULL) |
| 360 | return -ENODEV; |
Samuel Ortiz | 3e83329 | 2013-03-27 17:29:55 +0200 | [diff] [blame] | 361 | |
| 362 | if (device->ops && device->ops->recv) |
| 363 | return device->ops->recv(device, buf, length); |
| 364 | |
| 365 | return __mei_cl_recv(cl, buf, length); |
| 366 | } |
| 367 | EXPORT_SYMBOL_GPL(mei_cl_recv); |
| 368 | |
| 369 | static void mei_bus_event_work(struct work_struct *work) |
| 370 | { |
| 371 | struct mei_cl_device *device; |
| 372 | |
| 373 | device = container_of(work, struct mei_cl_device, event_work); |
| 374 | |
| 375 | if (device->event_cb) |
| 376 | device->event_cb(device, device->events, device->event_context); |
| 377 | |
| 378 | device->events = 0; |
| 379 | |
| 380 | /* Prepare for the next read */ |
Tomas Winkler | fcb136e | 2013-04-19 22:01:35 +0300 | [diff] [blame] | 381 | mei_cl_read_start(device->cl, 0); |
Samuel Ortiz | 3e83329 | 2013-03-27 17:29:55 +0200 | [diff] [blame] | 382 | } |
| 383 | |
| 384 | int mei_cl_register_event_cb(struct mei_cl_device *device, |
| 385 | mei_cl_event_cb_t event_cb, void *context) |
| 386 | { |
| 387 | if (device->event_cb) |
| 388 | return -EALREADY; |
| 389 | |
| 390 | device->events = 0; |
| 391 | device->event_cb = event_cb; |
| 392 | device->event_context = context; |
| 393 | INIT_WORK(&device->event_work, mei_bus_event_work); |
| 394 | |
Tomas Winkler | fcb136e | 2013-04-19 22:01:35 +0300 | [diff] [blame] | 395 | mei_cl_read_start(device->cl, 0); |
Samuel Ortiz | 3e83329 | 2013-03-27 17:29:55 +0200 | [diff] [blame] | 396 | |
| 397 | return 0; |
| 398 | } |
| 399 | EXPORT_SYMBOL_GPL(mei_cl_register_event_cb); |
Samuel Ortiz | cf3baef | 2013-03-27 17:29:57 +0200 | [diff] [blame] | 400 | |
Samuel Ortiz | aa6aef2 | 2013-03-27 17:29:59 +0200 | [diff] [blame] | 401 | void *mei_cl_get_drvdata(const struct mei_cl_device *device) |
| 402 | { |
| 403 | return dev_get_drvdata(&device->dev); |
| 404 | } |
| 405 | EXPORT_SYMBOL_GPL(mei_cl_get_drvdata); |
| 406 | |
| 407 | void mei_cl_set_drvdata(struct mei_cl_device *device, void *data) |
| 408 | { |
| 409 | dev_set_drvdata(&device->dev, data); |
| 410 | } |
| 411 | EXPORT_SYMBOL_GPL(mei_cl_set_drvdata); |
| 412 | |
Samuel Ortiz | e46980a | 2013-04-09 01:51:38 +0300 | [diff] [blame] | 413 | int mei_cl_enable_device(struct mei_cl_device *device) |
| 414 | { |
| 415 | int err; |
| 416 | struct mei_device *dev; |
| 417 | struct mei_cl *cl = device->cl; |
| 418 | |
| 419 | if (cl == NULL) |
| 420 | return -ENODEV; |
| 421 | |
| 422 | dev = cl->dev; |
| 423 | |
| 424 | mutex_lock(&dev->device_lock); |
| 425 | |
| 426 | cl->state = MEI_FILE_CONNECTING; |
| 427 | |
| 428 | err = mei_cl_connect(cl, NULL); |
| 429 | if (err < 0) { |
| 430 | mutex_unlock(&dev->device_lock); |
| 431 | dev_err(&dev->pdev->dev, "Could not connect to the ME client"); |
| 432 | |
| 433 | return err; |
| 434 | } |
| 435 | |
| 436 | mutex_unlock(&dev->device_lock); |
| 437 | |
| 438 | if (device->event_cb && !cl->read_cb) |
Tomas Winkler | fcb136e | 2013-04-19 22:01:35 +0300 | [diff] [blame] | 439 | mei_cl_read_start(device->cl, 0); |
Samuel Ortiz | e46980a | 2013-04-09 01:51:38 +0300 | [diff] [blame] | 440 | |
| 441 | if (!device->ops || !device->ops->enable) |
| 442 | return 0; |
| 443 | |
| 444 | return device->ops->enable(device); |
| 445 | } |
| 446 | EXPORT_SYMBOL_GPL(mei_cl_enable_device); |
| 447 | |
| 448 | int mei_cl_disable_device(struct mei_cl_device *device) |
| 449 | { |
| 450 | int err; |
| 451 | struct mei_device *dev; |
| 452 | struct mei_cl *cl = device->cl; |
| 453 | |
| 454 | if (cl == NULL) |
| 455 | return -ENODEV; |
| 456 | |
| 457 | dev = cl->dev; |
| 458 | |
| 459 | mutex_lock(&dev->device_lock); |
| 460 | |
| 461 | if (cl->state != MEI_FILE_CONNECTED) { |
| 462 | mutex_unlock(&dev->device_lock); |
| 463 | dev_err(&dev->pdev->dev, "Already disconnected"); |
| 464 | |
| 465 | return 0; |
| 466 | } |
| 467 | |
| 468 | cl->state = MEI_FILE_DISCONNECTING; |
| 469 | |
| 470 | err = mei_cl_disconnect(cl); |
| 471 | if (err < 0) { |
| 472 | mutex_unlock(&dev->device_lock); |
| 473 | dev_err(&dev->pdev->dev, |
| 474 | "Could not disconnect from the ME client"); |
| 475 | |
| 476 | return err; |
| 477 | } |
| 478 | |
| 479 | /* Flush queues and remove any pending read */ |
| 480 | mei_cl_flush_queues(cl); |
| 481 | |
| 482 | if (cl->read_cb) { |
| 483 | struct mei_cl_cb *cb = NULL; |
| 484 | |
| 485 | cb = mei_cl_find_read_cb(cl); |
| 486 | /* Remove entry from read list */ |
| 487 | if (cb) |
| 488 | list_del(&cb->list); |
| 489 | |
| 490 | cb = cl->read_cb; |
| 491 | cl->read_cb = NULL; |
| 492 | |
| 493 | if (cb) { |
| 494 | mei_io_cb_free(cb); |
| 495 | cb = NULL; |
| 496 | } |
| 497 | } |
| 498 | |
| 499 | mutex_unlock(&dev->device_lock); |
| 500 | |
| 501 | if (!device->ops || !device->ops->disable) |
| 502 | return 0; |
| 503 | |
| 504 | return device->ops->disable(device); |
| 505 | } |
| 506 | EXPORT_SYMBOL_GPL(mei_cl_disable_device); |
| 507 | |
Samuel Ortiz | cf3baef | 2013-03-27 17:29:57 +0200 | [diff] [blame] | 508 | void mei_cl_bus_rx_event(struct mei_cl *cl) |
| 509 | { |
| 510 | struct mei_cl_device *device = cl->device; |
| 511 | |
| 512 | if (!device || !device->event_cb) |
| 513 | return; |
| 514 | |
| 515 | set_bit(MEI_CL_EVENT_RX, &device->events); |
| 516 | |
| 517 | schedule_work(&device->event_work); |
| 518 | } |
| 519 | |
| 520 | int __init mei_cl_bus_init(void) |
| 521 | { |
| 522 | return bus_register(&mei_cl_bus_type); |
| 523 | } |
| 524 | |
| 525 | void __exit mei_cl_bus_exit(void) |
| 526 | { |
| 527 | bus_unregister(&mei_cl_bus_type); |
| 528 | } |