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Tomas Winkler9fff0422019-03-12 00:10:41 +02001// SPDX-License-Identifier: GPL-2.0
Oren Weilab841162011-05-15 13:43:41 +03002/*
Tomas Winkler1e55b602019-03-12 00:10:44 +02003 * Copyright (c) 2003-2018, Intel Corporation. All rights reserved.
Oren Weilab841162011-05-15 13:43:41 +03004 * Intel Management Engine Interface (Intel MEI) Linux driver
Oren Weilab841162011-05-15 13:43:41 +03005 */
Tomas Winkler9fff0422019-03-12 00:10:41 +02006
Oren Weilab841162011-05-15 13:43:41 +03007#include <linux/module.h>
8#include <linux/moduleparam.h>
9#include <linux/kernel.h>
10#include <linux/device.h>
Tomas Winkler1f180352014-09-29 16:31:46 +030011#include <linux/slab.h>
Oren Weilab841162011-05-15 13:43:41 +030012#include <linux/fs.h>
13#include <linux/errno.h>
14#include <linux/types.h>
15#include <linux/fcntl.h>
Oren Weilab841162011-05-15 13:43:41 +030016#include <linux/poll.h>
17#include <linux/init.h>
18#include <linux/ioctl.h>
19#include <linux/cdev.h>
Ingo Molnar174cd4b2017-02-02 19:15:33 +010020#include <linux/sched/signal.h>
Oren Weilab841162011-05-15 13:43:41 +030021#include <linux/uuid.h>
22#include <linux/compat.h>
23#include <linux/jiffies.h>
24#include <linux/interrupt.h>
25
Tomas Winkler4f3afe12012-05-09 16:38:59 +030026#include <linux/mei.h>
Tomas Winkler47a73802012-12-25 19:06:03 +020027
28#include "mei_dev.h"
Tomas Winkler90e0b5f2013-01-08 23:07:14 +020029#include "client.h"
Oren Weilab841162011-05-15 13:43:41 +030030
Alexander Usyskin43b8a7e2019-04-22 09:51:07 +030031static struct class *mei_class;
32static dev_t mei_devt;
33#define MEI_MAX_DEVS MINORMASK
34static DEFINE_MUTEX(mei_minor_lock);
35static DEFINE_IDR(mei_idr);
36
Oren Weilab841162011-05-15 13:43:41 +030037/**
Oren Weilab841162011-05-15 13:43:41 +030038 * mei_open - the open function
39 *
40 * @inode: pointer to inode structure
41 * @file: pointer to file structure
Alexander Usyskin83ce0742014-01-08 22:31:46 +020042 *
Alexander Usyskina8605ea2014-09-29 16:31:49 +030043 * Return: 0 on success, <0 on error
Oren Weilab841162011-05-15 13:43:41 +030044 */
45static int mei_open(struct inode *inode, struct file *file)
46{
Oren Weilab841162011-05-15 13:43:41 +030047 struct mei_device *dev;
Alexander Usyskinf3d8e872014-06-23 15:10:35 +030048 struct mei_cl *cl;
Tomas Winkler2703d4b2013-02-06 14:06:39 +020049
Tomas Winkler6f37aca2011-11-13 09:41:15 +020050 int err;
Oren Weilab841162011-05-15 13:43:41 +030051
Alexander Usyskinf3d8e872014-06-23 15:10:35 +030052 dev = container_of(inode->i_cdev, struct mei_device, cdev);
Oren Weil5b881e32011-11-13 09:41:14 +020053 if (!dev)
Tomas Winklere036cc52013-09-16 23:44:46 +030054 return -ENODEV;
Oren Weilab841162011-05-15 13:43:41 +030055
56 mutex_lock(&dev->device_lock);
Tomas Winklere036cc52013-09-16 23:44:46 +030057
Tomas Winklerb210d752012-08-07 00:03:56 +030058 if (dev->dev_state != MEI_DEV_ENABLED) {
Tomas Winkler2bf94cab2014-09-29 16:31:42 +030059 dev_dbg(dev->dev, "dev_state != MEI_ENABLED dev_state = %s\n",
Tomas Winklerb210d752012-08-07 00:03:56 +030060 mei_dev_state_str(dev->dev_state));
Tomas Winkler03b8d342015-02-10 10:39:44 +020061 err = -ENODEV;
Tomas Winklere036cc52013-09-16 23:44:46 +030062 goto err_unlock;
Tomas Winkler1b812942012-09-11 00:43:20 +030063 }
Oren Weilab841162011-05-15 13:43:41 +030064
Alexander Usyskin7851e002016-02-07 23:35:40 +020065 cl = mei_cl_alloc_linked(dev);
Tomas Winkler03b8d342015-02-10 10:39:44 +020066 if (IS_ERR(cl)) {
67 err = PTR_ERR(cl);
Tomas Winklere036cc52013-09-16 23:44:46 +030068 goto err_unlock;
Tomas Winkler03b8d342015-02-10 10:39:44 +020069 }
Oren Weilab841162011-05-15 13:43:41 +030070
Alexander Usyskin97d549b2016-06-16 17:58:57 +030071 cl->fp = file;
Oren Weilab841162011-05-15 13:43:41 +030072 file->private_data = cl;
Tomas Winklere036cc52013-09-16 23:44:46 +030073
Oren Weilab841162011-05-15 13:43:41 +030074 mutex_unlock(&dev->device_lock);
75
Oren Weil5b881e32011-11-13 09:41:14 +020076 return nonseekable_open(inode, file);
Oren Weilab841162011-05-15 13:43:41 +030077
Tomas Winklere036cc52013-09-16 23:44:46 +030078err_unlock:
Oren Weilab841162011-05-15 13:43:41 +030079 mutex_unlock(&dev->device_lock);
Oren Weilab841162011-05-15 13:43:41 +030080 return err;
81}
82
83/**
84 * mei_release - the release function
85 *
86 * @inode: pointer to inode structure
87 * @file: pointer to file structure
88 *
Alexander Usyskina8605ea2014-09-29 16:31:49 +030089 * Return: 0 on success, <0 on error
Oren Weilab841162011-05-15 13:43:41 +030090 */
91static int mei_release(struct inode *inode, struct file *file)
92{
93 struct mei_cl *cl = file->private_data;
Oren Weilab841162011-05-15 13:43:41 +030094 struct mei_device *dev;
Tomas Winkler3c666182015-05-04 09:43:52 +030095 int rets;
Oren Weilab841162011-05-15 13:43:41 +030096
97 if (WARN_ON(!cl || !cl->dev))
98 return -ENODEV;
99
100 dev = cl->dev;
101
102 mutex_lock(&dev->device_lock);
Alexander Usyskin394a77d2017-03-20 15:04:03 +0200103
Tomas Winkler3c666182015-05-04 09:43:52 +0300104 rets = mei_cl_disconnect(cl);
105
Tomas Winklera9bed612015-02-10 10:39:46 +0200106 mei_cl_flush_queues(cl, file);
Tomas Winkler46922182014-03-16 14:35:55 +0200107 cl_dbg(dev, cl, "removing\n");
Tomas Winklera562d5c2012-11-11 17:38:01 +0200108
Tomas Winkler90e0b5f2013-01-08 23:07:14 +0200109 mei_cl_unlink(cl);
Tomas Winklera562d5c2012-11-11 17:38:01 +0200110
Tomas Winklera562d5c2012-11-11 17:38:01 +0200111 file->private_data = NULL;
112
Tomas Winklera562d5c2012-11-11 17:38:01 +0200113 kfree(cl);
Alexander Usyskin394a77d2017-03-20 15:04:03 +0200114
Oren Weilab841162011-05-15 13:43:41 +0300115 mutex_unlock(&dev->device_lock);
116 return rets;
117}
118
119
120/**
121 * mei_read - the read function.
122 *
123 * @file: pointer to file structure
124 * @ubuf: pointer to user buffer
125 * @length: buffer length
126 * @offset: data offset in buffer
127 *
Alexander Usyskina8605ea2014-09-29 16:31:49 +0300128 * Return: >=0 data length on success , <0 on error
Oren Weilab841162011-05-15 13:43:41 +0300129 */
130static ssize_t mei_read(struct file *file, char __user *ubuf,
Tomas Winkler441ab502011-12-13 23:39:34 +0200131 size_t length, loff_t *offset)
Oren Weilab841162011-05-15 13:43:41 +0300132{
133 struct mei_cl *cl = file->private_data;
Oren Weilab841162011-05-15 13:43:41 +0300134 struct mei_device *dev;
Tomas Winklera9bed612015-02-10 10:39:46 +0200135 struct mei_cl_cb *cb = NULL;
Alexander Usyskinff1586a2016-07-26 01:06:06 +0300136 bool nonblock = !!(file->f_flags & O_NONBLOCK);
Tomas Winkler5151e2b2018-07-12 17:10:10 +0300137 ssize_t rets;
Oren Weilab841162011-05-15 13:43:41 +0300138
139 if (WARN_ON(!cl || !cl->dev))
140 return -ENODEV;
141
142 dev = cl->dev;
143
Tomas Winklerdd5de1f2013-09-02 03:11:04 +0300144
Oren Weilab841162011-05-15 13:43:41 +0300145 mutex_lock(&dev->device_lock);
Tomas Winklerb210d752012-08-07 00:03:56 +0300146 if (dev->dev_state != MEI_DEV_ENABLED) {
Oren Weilab841162011-05-15 13:43:41 +0300147 rets = -ENODEV;
148 goto out;
149 }
150
Tomas Winklerdd5de1f2013-09-02 03:11:04 +0300151 if (length == 0) {
152 rets = 0;
153 goto out;
154 }
155
Alexander Usyskin8b2458f2016-01-07 14:46:37 +0200156 if (ubuf == NULL) {
157 rets = -EMSGSIZE;
158 goto out;
159 }
160
Tomas Winklera9bed612015-02-10 10:39:46 +0200161 cb = mei_cl_read_cb(cl, file);
Alexander Usyskin8b2458f2016-01-07 14:46:37 +0200162 if (cb)
163 goto copy_buffer;
164
165 if (*offset > 0)
Oren Weilab841162011-05-15 13:43:41 +0300166 *offset = 0;
Oren Weilab841162011-05-15 13:43:41 +0300167
Alexander Usyskinff1586a2016-07-26 01:06:06 +0300168 rets = mei_cl_read_start(cl, length, file);
169 if (rets && rets != -EBUSY) {
Tomas Winkler5151e2b2018-07-12 17:10:10 +0300170 cl_dbg(dev, cl, "mei start read failure status = %zd\n", rets);
Oren Weilab841162011-05-15 13:43:41 +0300171 goto out;
172 }
173
Alexander Usyskinff1586a2016-07-26 01:06:06 +0300174 if (nonblock) {
175 rets = -EAGAIN;
176 goto out;
177 }
Oren Weilab841162011-05-15 13:43:41 +0300178
Alexander Usyskincb97fbb2017-02-08 00:41:45 +0200179 mutex_unlock(&dev->device_lock);
180 if (wait_event_interruptible(cl->rx_wait,
181 !list_empty(&cl->rd_completed) ||
182 !mei_cl_is_connected(cl))) {
183 if (signal_pending(current))
184 return -EINTR;
185 return -ERESTARTSYS;
186 }
187 mutex_lock(&dev->device_lock);
188
189 if (!mei_cl_is_connected(cl)) {
190 rets = -ENODEV;
Alexander Usyskinff1586a2016-07-26 01:06:06 +0300191 goto out;
192 }
193
Alexander Usyskincb97fbb2017-02-08 00:41:45 +0200194 cb = mei_cl_read_cb(cl, file);
195 if (!cb) {
Alexander Usyskincb97fbb2017-02-08 00:41:45 +0200196 rets = 0;
197 goto out;
198 }
Tomas Winkler3d33ff22015-02-10 10:39:36 +0200199
Oren Weilab841162011-05-15 13:43:41 +0300200copy_buffer:
Tomas Winkler3d33ff22015-02-10 10:39:36 +0200201 /* now copy the data to user space */
202 if (cb->status) {
203 rets = cb->status;
Tomas Winkler5151e2b2018-07-12 17:10:10 +0300204 cl_dbg(dev, cl, "read operation failed %zd\n", rets);
Tomas Winkler3d33ff22015-02-10 10:39:36 +0200205 goto free;
206 }
207
Alexander Usyskin35bf7692016-02-17 18:27:34 +0200208 cl_dbg(dev, cl, "buf.size = %zu buf.idx = %zu offset = %lld\n",
Alexander Usyskin8b2458f2016-01-07 14:46:37 +0200209 cb->buf.size, cb->buf_idx, *offset);
210 if (*offset >= cb->buf_idx) {
211 rets = 0;
Oren Weilab841162011-05-15 13:43:41 +0300212 goto free;
213 }
214
Tomas Winklerebb108ef2012-10-09 16:50:16 +0200215 /* length is being truncated to PAGE_SIZE,
216 * however buf_idx may point beyond that */
217 length = min_t(size_t, length, cb->buf_idx - *offset);
Oren Weilab841162011-05-15 13:43:41 +0300218
Tomas Winkler5db75142015-02-10 10:39:42 +0200219 if (copy_to_user(ubuf, cb->buf.data + *offset, length)) {
Tomas Winkler2bf94cab2014-09-29 16:31:42 +0300220 dev_dbg(dev->dev, "failed to copy data to userland\n");
Oren Weilab841162011-05-15 13:43:41 +0300221 rets = -EFAULT;
222 goto free;
223 }
224
225 rets = length;
226 *offset += length;
Tomas Winklerf862b6b2016-02-07 23:35:19 +0200227 /* not all data was read, keep the cb */
228 if (*offset < cb->buf_idx)
Oren Weilab841162011-05-15 13:43:41 +0300229 goto out;
230
231free:
Tomas Winkler601a1ef2012-10-09 16:50:20 +0200232 mei_io_cb_free(cb);
Alexander Usyskin8b2458f2016-01-07 14:46:37 +0200233 *offset = 0;
Tomas Winkler928fa662015-02-10 10:39:45 +0200234
Oren Weilab841162011-05-15 13:43:41 +0300235out:
Tomas Winkler5151e2b2018-07-12 17:10:10 +0300236 cl_dbg(dev, cl, "end mei read rets = %zd\n", rets);
Oren Weilab841162011-05-15 13:43:41 +0300237 mutex_unlock(&dev->device_lock);
238 return rets;
239}
Tomas Winkler33d28c92012-10-09 16:50:17 +0200240/**
Oren Weilab841162011-05-15 13:43:41 +0300241 * mei_write - the write function.
242 *
243 * @file: pointer to file structure
244 * @ubuf: pointer to user buffer
245 * @length: buffer length
246 * @offset: data offset in buffer
247 *
Alexander Usyskina8605ea2014-09-29 16:31:49 +0300248 * Return: >=0 data length on success , <0 on error
Oren Weilab841162011-05-15 13:43:41 +0300249 */
250static ssize_t mei_write(struct file *file, const char __user *ubuf,
Tomas Winkler441ab502011-12-13 23:39:34 +0200251 size_t length, loff_t *offset)
Oren Weilab841162011-05-15 13:43:41 +0300252{
253 struct mei_cl *cl = file->private_data;
Alexander Usyskin6cbb0972016-02-10 23:57:26 +0200254 struct mei_cl_cb *cb;
Oren Weilab841162011-05-15 13:43:41 +0300255 struct mei_device *dev;
Tomas Winkler5151e2b2018-07-12 17:10:10 +0300256 ssize_t rets;
Oren Weilab841162011-05-15 13:43:41 +0300257
258 if (WARN_ON(!cl || !cl->dev))
259 return -ENODEV;
260
261 dev = cl->dev;
262
263 mutex_lock(&dev->device_lock);
264
Tomas Winklerb210d752012-08-07 00:03:56 +0300265 if (dev->dev_state != MEI_DEV_ENABLED) {
Tomas Winkler75f0ee12012-10-09 16:50:18 +0200266 rets = -ENODEV;
Tomas Winkler4234a6d2013-04-08 21:56:37 +0300267 goto out;
Oren Weilab841162011-05-15 13:43:41 +0300268 }
269
Alexander Usyskind49ed642015-05-04 09:43:54 +0300270 if (!mei_cl_is_connected(cl)) {
271 cl_err(dev, cl, "is not connected");
272 rets = -ENODEV;
273 goto out;
274 }
275
276 if (!mei_me_cl_is_active(cl->me_cl)) {
Alexander Usyskin7ca96aa2014-02-19 17:35:49 +0200277 rets = -ENOTTY;
Tomas Winkler4234a6d2013-04-08 21:56:37 +0300278 goto out;
Tomas Winkler75f0ee12012-10-09 16:50:18 +0200279 }
Tomas Winklerdd5de1f2013-09-02 03:11:04 +0300280
Alexander Usyskind49ed642015-05-04 09:43:54 +0300281 if (length > mei_cl_mtu(cl)) {
282 rets = -EFBIG;
283 goto out;
284 }
285
Tomas Winklerdd5de1f2013-09-02 03:11:04 +0300286 if (length == 0) {
287 rets = 0;
288 goto out;
289 }
290
Alexander Usyskinaf336ca2018-02-25 20:07:05 +0200291 while (cl->tx_cb_queued >= dev->tx_queue_limit) {
292 if (file->f_flags & O_NONBLOCK) {
293 rets = -EAGAIN;
294 goto out;
295 }
296 mutex_unlock(&dev->device_lock);
297 rets = wait_event_interruptible(cl->tx_wait,
298 cl->writing_state == MEI_WRITE_COMPLETE ||
299 (!mei_cl_is_connected(cl)));
300 mutex_lock(&dev->device_lock);
301 if (rets) {
302 if (signal_pending(current))
303 rets = -EINTR;
304 goto out;
305 }
306 if (!mei_cl_is_connected(cl)) {
307 rets = -ENODEV;
308 goto out;
309 }
310 }
311
Alexander Usyskin6cbb0972016-02-10 23:57:26 +0200312 cb = mei_cl_alloc_cb(cl, length, MEI_FOP_WRITE, file);
313 if (!cb) {
Tomas Winkler33d28c92012-10-09 16:50:17 +0200314 rets = -ENOMEM;
Tomas Winkler4234a6d2013-04-08 21:56:37 +0300315 goto out;
Oren Weilab841162011-05-15 13:43:41 +0300316 }
Oren Weilab841162011-05-15 13:43:41 +0300317
Alexander Usyskin6cbb0972016-02-10 23:57:26 +0200318 rets = copy_from_user(cb->buf.data, ubuf, length);
Alexander Usyskind8b29ef2013-09-02 03:11:02 +0300319 if (rets) {
Tomas Winkler2bf94cab2014-09-29 16:31:42 +0300320 dev_dbg(dev->dev, "failed to copy data from userland\n");
Alexander Usyskind8b29ef2013-09-02 03:11:02 +0300321 rets = -EFAULT;
Alexander Usyskin6cbb0972016-02-10 23:57:26 +0200322 mei_io_cb_free(cb);
Tomas Winkler4234a6d2013-04-08 21:56:37 +0300323 goto out;
Alexander Usyskind8b29ef2013-09-02 03:11:02 +0300324 }
Oren Weilab841162011-05-15 13:43:41 +0300325
Alexander Usyskine0cb6b22016-11-08 18:26:08 +0200326 rets = mei_cl_write(cl, cb);
Tomas Winklerb0d0cf72012-11-01 21:17:13 +0200327out:
Oren Weilab841162011-05-15 13:43:41 +0300328 mutex_unlock(&dev->device_lock);
Oren Weilab841162011-05-15 13:43:41 +0300329 return rets;
330}
331
Tomas Winkler9f81abda2013-01-08 23:07:15 +0200332/**
333 * mei_ioctl_connect_client - the connect to fw client IOCTL function
334 *
Tomas Winkler9f81abda2013-01-08 23:07:15 +0200335 * @file: private data of the file object
Alexander Usyskina8605ea2014-09-29 16:31:49 +0300336 * @data: IOCTL connect data, input and output parameters
Tomas Winkler9f81abda2013-01-08 23:07:15 +0200337 *
338 * Locking: called under "dev->device_lock" lock
339 *
Alexander Usyskina8605ea2014-09-29 16:31:49 +0300340 * Return: 0 on success, <0 on failure.
Tomas Winkler9f81abda2013-01-08 23:07:15 +0200341 */
342static int mei_ioctl_connect_client(struct file *file,
343 struct mei_connect_client_data *data)
344{
345 struct mei_device *dev;
346 struct mei_client *client;
Tomas Winklerd3208322014-08-24 12:08:55 +0300347 struct mei_me_client *me_cl;
Tomas Winkler9f81abda2013-01-08 23:07:15 +0200348 struct mei_cl *cl;
Tomas Winkler9f81abda2013-01-08 23:07:15 +0200349 int rets;
350
351 cl = file->private_data;
Tomas Winkler9f81abda2013-01-08 23:07:15 +0200352 dev = cl->dev;
353
Tomas Winkler79563db2015-01-11 00:07:16 +0200354 if (dev->dev_state != MEI_DEV_ENABLED)
355 return -ENODEV;
Tomas Winkler9f81abda2013-01-08 23:07:15 +0200356
357 if (cl->state != MEI_FILE_INITIALIZING &&
Tomas Winkler79563db2015-01-11 00:07:16 +0200358 cl->state != MEI_FILE_DISCONNECTED)
359 return -EBUSY;
Tomas Winkler9f81abda2013-01-08 23:07:15 +0200360
361 /* find ME client we're trying to connect to */
Tomas Winklerd3208322014-08-24 12:08:55 +0300362 me_cl = mei_me_cl_by_uuid(dev, &data->in_client_uuid);
Alexander Usyskinf4e06242016-02-07 23:35:38 +0200363 if (!me_cl) {
Tomas Winkler2bf94cab2014-09-29 16:31:42 +0300364 dev_dbg(dev->dev, "Cannot connect to FW Client UUID = %pUl\n",
Alexander Usyskind49ed642015-05-04 09:43:54 +0300365 &data->in_client_uuid);
Alexander Usyskinf4e06242016-02-07 23:35:38 +0200366 rets = -ENOTTY;
367 goto end;
368 }
369
370 if (me_cl->props.fixed_address) {
371 bool forbidden = dev->override_fixed_address ?
372 !dev->allow_fixed_address : !dev->hbm_f_fa_supported;
373 if (forbidden) {
374 dev_dbg(dev->dev, "Connection forbidden to FW Client UUID = %pUl\n",
375 &data->in_client_uuid);
376 rets = -ENOTTY;
377 goto end;
378 }
Tomas Winkler9f81abda2013-01-08 23:07:15 +0200379 }
380
Tomas Winkler2bf94cab2014-09-29 16:31:42 +0300381 dev_dbg(dev->dev, "Connect to FW Client ID = %d\n",
Alexander Usyskind49ed642015-05-04 09:43:54 +0300382 me_cl->client_id);
Tomas Winkler2bf94cab2014-09-29 16:31:42 +0300383 dev_dbg(dev->dev, "FW Client - Protocol Version = %d\n",
Tomas Winklerd3208322014-08-24 12:08:55 +0300384 me_cl->props.protocol_version);
Tomas Winkler2bf94cab2014-09-29 16:31:42 +0300385 dev_dbg(dev->dev, "FW Client - Max Msg Len = %d\n",
Tomas Winklerd3208322014-08-24 12:08:55 +0300386 me_cl->props.max_msg_length);
Tomas Winkler9f81abda2013-01-08 23:07:15 +0200387
Tomas Winkler9f81abda2013-01-08 23:07:15 +0200388 /* prepare the output buffer */
389 client = &data->out_client_properties;
Tomas Winklerd3208322014-08-24 12:08:55 +0300390 client->max_msg_length = me_cl->props.max_msg_length;
391 client->protocol_version = me_cl->props.protocol_version;
Tomas Winkler2bf94cab2014-09-29 16:31:42 +0300392 dev_dbg(dev->dev, "Can connect?\n");
Tomas Winkler9f81abda2013-01-08 23:07:15 +0200393
Alexander Usyskind49ed642015-05-04 09:43:54 +0300394 rets = mei_cl_connect(cl, me_cl, file);
Tomas Winkler9f81abda2013-01-08 23:07:15 +0200395
396end:
Tomas Winkler79563db2015-01-11 00:07:16 +0200397 mei_me_cl_put(me_cl);
Tomas Winkler9f81abda2013-01-08 23:07:15 +0200398 return rets;
399}
400
Oren Weilab841162011-05-15 13:43:41 +0300401/**
Tomas Winkler3c7c8462015-07-26 09:54:20 +0300402 * mei_ioctl_client_notify_request -
403 * propagate event notification request to client
404 *
405 * @file: pointer to file structure
406 * @request: 0 - disable, 1 - enable
407 *
408 * Return: 0 on success , <0 on error
409 */
Tomas Winklerf23e2cc2016-02-07 23:35:23 +0200410static int mei_ioctl_client_notify_request(const struct file *file, u32 request)
Tomas Winkler3c7c8462015-07-26 09:54:20 +0300411{
412 struct mei_cl *cl = file->private_data;
413
Alexander Usyskin7326fff2016-01-17 12:25:01 +0200414 if (request != MEI_HBM_NOTIFICATION_START &&
415 request != MEI_HBM_NOTIFICATION_STOP)
416 return -EINVAL;
417
418 return mei_cl_notify_request(cl, file, (u8)request);
Tomas Winkler3c7c8462015-07-26 09:54:20 +0300419}
420
421/**
422 * mei_ioctl_client_notify_get - wait for notification request
423 *
424 * @file: pointer to file structure
425 * @notify_get: 0 - disable, 1 - enable
426 *
427 * Return: 0 on success , <0 on error
428 */
Tomas Winklerf23e2cc2016-02-07 23:35:23 +0200429static int mei_ioctl_client_notify_get(const struct file *file, u32 *notify_get)
Tomas Winkler3c7c8462015-07-26 09:54:20 +0300430{
431 struct mei_cl *cl = file->private_data;
432 bool notify_ev;
433 bool block = (file->f_flags & O_NONBLOCK) == 0;
434 int rets;
435
436 rets = mei_cl_notify_get(cl, block, &notify_ev);
437 if (rets)
438 return rets;
439
440 *notify_get = notify_ev ? 1 : 0;
441 return 0;
442}
443
444/**
Oren Weilab841162011-05-15 13:43:41 +0300445 * mei_ioctl - the IOCTL function
446 *
447 * @file: pointer to file structure
448 * @cmd: ioctl command
449 * @data: pointer to mei message structure
450 *
Alexander Usyskina8605ea2014-09-29 16:31:49 +0300451 * Return: 0 on success , <0 on error
Oren Weilab841162011-05-15 13:43:41 +0300452 */
453static long mei_ioctl(struct file *file, unsigned int cmd, unsigned long data)
454{
455 struct mei_device *dev;
456 struct mei_cl *cl = file->private_data;
Tomas Winkler154eb182014-08-21 14:29:23 +0300457 struct mei_connect_client_data connect_data;
Tomas Winkler3c7c8462015-07-26 09:54:20 +0300458 u32 notify_get, notify_req;
Oren Weilab841162011-05-15 13:43:41 +0300459 int rets;
460
Oren Weilab841162011-05-15 13:43:41 +0300461
462 if (WARN_ON(!cl || !cl->dev))
463 return -ENODEV;
464
465 dev = cl->dev;
466
Tomas Winkler2bf94cab2014-09-29 16:31:42 +0300467 dev_dbg(dev->dev, "IOCTL cmd = 0x%x", cmd);
Oren Weilab841162011-05-15 13:43:41 +0300468
469 mutex_lock(&dev->device_lock);
Tomas Winklerb210d752012-08-07 00:03:56 +0300470 if (dev->dev_state != MEI_DEV_ENABLED) {
Oren Weilab841162011-05-15 13:43:41 +0300471 rets = -ENODEV;
472 goto out;
473 }
474
Tomas Winkler4f046e72014-08-21 14:29:22 +0300475 switch (cmd) {
476 case IOCTL_MEI_CONNECT_CLIENT:
Tomas Winkler2bf94cab2014-09-29 16:31:42 +0300477 dev_dbg(dev->dev, ": IOCTL_MEI_CONNECT_CLIENT.\n");
Tomas Winkler154eb182014-08-21 14:29:23 +0300478 if (copy_from_user(&connect_data, (char __user *)data,
Oren Weilab841162011-05-15 13:43:41 +0300479 sizeof(struct mei_connect_client_data))) {
Tomas Winkler2bf94cab2014-09-29 16:31:42 +0300480 dev_dbg(dev->dev, "failed to copy data from userland\n");
Tomas Winkler4f046e72014-08-21 14:29:22 +0300481 rets = -EFAULT;
482 goto out;
483 }
Tomas Winkler9f81abda2013-01-08 23:07:15 +0200484
Tomas Winkler154eb182014-08-21 14:29:23 +0300485 rets = mei_ioctl_connect_client(file, &connect_data);
Tomas Winkler4f046e72014-08-21 14:29:22 +0300486 if (rets)
487 goto out;
Oren Weilab841162011-05-15 13:43:41 +0300488
Tomas Winkler4f046e72014-08-21 14:29:22 +0300489 /* if all is ok, copying the data back to user. */
Tomas Winkler154eb182014-08-21 14:29:23 +0300490 if (copy_to_user((char __user *)data, &connect_data,
Oren Weilab841162011-05-15 13:43:41 +0300491 sizeof(struct mei_connect_client_data))) {
Tomas Winkler2bf94cab2014-09-29 16:31:42 +0300492 dev_dbg(dev->dev, "failed to copy data to userland\n");
Tomas Winkler4f046e72014-08-21 14:29:22 +0300493 rets = -EFAULT;
494 goto out;
495 }
496
497 break;
Tomas Winkler154eb182014-08-21 14:29:23 +0300498
Tomas Winkler3c7c8462015-07-26 09:54:20 +0300499 case IOCTL_MEI_NOTIFY_SET:
500 dev_dbg(dev->dev, ": IOCTL_MEI_NOTIFY_SET.\n");
501 if (copy_from_user(&notify_req,
502 (char __user *)data, sizeof(notify_req))) {
503 dev_dbg(dev->dev, "failed to copy data from userland\n");
504 rets = -EFAULT;
505 goto out;
506 }
507 rets = mei_ioctl_client_notify_request(file, notify_req);
508 break;
509
510 case IOCTL_MEI_NOTIFY_GET:
511 dev_dbg(dev->dev, ": IOCTL_MEI_NOTIFY_GET.\n");
512 rets = mei_ioctl_client_notify_get(file, &notify_get);
513 if (rets)
514 goto out;
515
516 dev_dbg(dev->dev, "copy connect data to user\n");
517 if (copy_to_user((char __user *)data,
518 &notify_get, sizeof(notify_get))) {
519 dev_dbg(dev->dev, "failed to copy data to userland\n");
520 rets = -EFAULT;
521 goto out;
522
523 }
524 break;
525
Tomas Winkler4f046e72014-08-21 14:29:22 +0300526 default:
Tomas Winkler4f046e72014-08-21 14:29:22 +0300527 rets = -ENOIOCTLCMD;
Oren Weilab841162011-05-15 13:43:41 +0300528 }
529
530out:
Oren Weilab841162011-05-15 13:43:41 +0300531 mutex_unlock(&dev->device_lock);
532 return rets;
533}
534
535/**
536 * mei_compat_ioctl - the compat IOCTL function
537 *
538 * @file: pointer to file structure
539 * @cmd: ioctl command
540 * @data: pointer to mei message structure
541 *
Alexander Usyskina8605ea2014-09-29 16:31:49 +0300542 * Return: 0 on success , <0 on error
Oren Weilab841162011-05-15 13:43:41 +0300543 */
544#ifdef CONFIG_COMPAT
545static long mei_compat_ioctl(struct file *file,
Tomas Winkler441ab502011-12-13 23:39:34 +0200546 unsigned int cmd, unsigned long data)
Oren Weilab841162011-05-15 13:43:41 +0300547{
548 return mei_ioctl(file, cmd, (unsigned long)compat_ptr(data));
549}
550#endif
551
552
553/**
554 * mei_poll - the poll function
555 *
556 * @file: pointer to file structure
557 * @wait: pointer to poll_table structure
558 *
Alexander Usyskina8605ea2014-09-29 16:31:49 +0300559 * Return: poll mask
Oren Weilab841162011-05-15 13:43:41 +0300560 */
Al Viroafc9a422017-07-03 06:39:46 -0400561static __poll_t mei_poll(struct file *file, poll_table *wait)
Oren Weilab841162011-05-15 13:43:41 +0300562{
Al Viro01699432017-07-03 03:14:15 -0400563 __poll_t req_events = poll_requested_events(wait);
Oren Weilab841162011-05-15 13:43:41 +0300564 struct mei_cl *cl = file->private_data;
565 struct mei_device *dev;
Al Viroafc9a422017-07-03 06:39:46 -0400566 __poll_t mask = 0;
Tomas Winkler2c84c292015-07-26 09:54:21 +0300567 bool notify_en;
Oren Weilab841162011-05-15 13:43:41 +0300568
569 if (WARN_ON(!cl || !cl->dev))
Linus Torvaldsa9a08842018-02-11 14:34:03 -0800570 return EPOLLERR;
Oren Weilab841162011-05-15 13:43:41 +0300571
572 dev = cl->dev;
573
574 mutex_lock(&dev->device_lock);
575
Linus Torvaldsa9a08842018-02-11 14:34:03 -0800576 notify_en = cl->notify_en && (req_events & EPOLLPRI);
Tomas Winklerf3de9b62015-03-27 00:27:58 +0200577
578 if (dev->dev_state != MEI_DEV_ENABLED ||
579 !mei_cl_is_connected(cl)) {
Linus Torvaldsa9a08842018-02-11 14:34:03 -0800580 mask = EPOLLERR;
Oren Weilab841162011-05-15 13:43:41 +0300581 goto out;
582 }
583
Tomas Winkler2c84c292015-07-26 09:54:21 +0300584 if (notify_en) {
585 poll_wait(file, &cl->ev_wait, wait);
586 if (cl->notify_ev)
Linus Torvaldsa9a08842018-02-11 14:34:03 -0800587 mask |= EPOLLPRI;
Tomas Winkler2c84c292015-07-26 09:54:21 +0300588 }
589
Linus Torvaldsa9a08842018-02-11 14:34:03 -0800590 if (req_events & (EPOLLIN | EPOLLRDNORM)) {
Tomas Winkler1d9013f2015-03-27 00:27:57 +0200591 poll_wait(file, &cl->rx_wait, wait);
592
593 if (!list_empty(&cl->rd_completed))
Linus Torvaldsa9a08842018-02-11 14:34:03 -0800594 mask |= EPOLLIN | EPOLLRDNORM;
Tomas Winkler1d9013f2015-03-27 00:27:57 +0200595 else
Tomas Winkler3030dc02016-07-26 01:06:05 +0300596 mei_cl_read_start(cl, mei_cl_mtu(cl), file);
Tomas Winkler1d9013f2015-03-27 00:27:57 +0200597 }
Oren Weilab841162011-05-15 13:43:41 +0300598
Tomas Winkler03b2cbb2018-09-28 23:27:48 +0300599 if (req_events & (EPOLLOUT | EPOLLWRNORM)) {
Alexander Usyskinaf336ca2018-02-25 20:07:05 +0200600 poll_wait(file, &cl->tx_wait, wait);
601 if (cl->tx_cb_queued < dev->tx_queue_limit)
Tomas Winkler03b2cbb2018-09-28 23:27:48 +0300602 mask |= EPOLLOUT | EPOLLWRNORM;
Alexander Usyskinaf336ca2018-02-25 20:07:05 +0200603 }
604
Oren Weilab841162011-05-15 13:43:41 +0300605out:
606 mutex_unlock(&dev->device_lock);
607 return mask;
608}
609
Tomas Winkler55c4e642014-11-19 17:01:39 +0200610/**
Alexander Usyskin58cde1a2017-03-20 15:04:06 +0200611 * mei_cl_is_write_queued - check if the client has pending writes.
612 *
613 * @cl: writing host client
614 *
615 * Return: true if client is writing, false otherwise.
616 */
617static bool mei_cl_is_write_queued(struct mei_cl *cl)
618{
619 struct mei_device *dev = cl->dev;
620 struct mei_cl_cb *cb;
621
622 list_for_each_entry(cb, &dev->write_list, list)
623 if (cb->cl == cl)
624 return true;
625 list_for_each_entry(cb, &dev->write_waiting_list, list)
626 if (cb->cl == cl)
627 return true;
628 return false;
629}
630
631/**
632 * mei_fsync - the fsync handler
633 *
634 * @fp: pointer to file structure
635 * @start: unused
636 * @end: unused
637 * @datasync: unused
638 *
639 * Return: 0 on success, -ENODEV if client is not connected
640 */
641static int mei_fsync(struct file *fp, loff_t start, loff_t end, int datasync)
642{
643 struct mei_cl *cl = fp->private_data;
644 struct mei_device *dev;
645 int rets;
646
647 if (WARN_ON(!cl || !cl->dev))
648 return -ENODEV;
649
650 dev = cl->dev;
651
652 mutex_lock(&dev->device_lock);
653
654 if (dev->dev_state != MEI_DEV_ENABLED || !mei_cl_is_connected(cl)) {
655 rets = -ENODEV;
656 goto out;
657 }
658
659 while (mei_cl_is_write_queued(cl)) {
660 mutex_unlock(&dev->device_lock);
661 rets = wait_event_interruptible(cl->tx_wait,
662 cl->writing_state == MEI_WRITE_COMPLETE ||
663 !mei_cl_is_connected(cl));
664 mutex_lock(&dev->device_lock);
665 if (rets) {
666 if (signal_pending(current))
667 rets = -EINTR;
668 goto out;
669 }
670 if (!mei_cl_is_connected(cl)) {
671 rets = -ENODEV;
672 goto out;
673 }
674 }
675 rets = 0;
676out:
677 mutex_unlock(&dev->device_lock);
678 return rets;
679}
680
681/**
Tomas Winkler237092b2015-07-26 09:54:22 +0300682 * mei_fasync - asynchronous io support
683 *
684 * @fd: file descriptor
685 * @file: pointer to file structure
686 * @band: band bitmap
687 *
Tomas Winklered6dc532016-01-07 14:46:38 +0200688 * Return: negative on error,
689 * 0 if it did no changes,
690 * and positive a process was added or deleted
Tomas Winkler237092b2015-07-26 09:54:22 +0300691 */
692static int mei_fasync(int fd, struct file *file, int band)
693{
694
695 struct mei_cl *cl = file->private_data;
696
697 if (!mei_cl_is_connected(cl))
Tomas Winklered6dc532016-01-07 14:46:38 +0200698 return -ENODEV;
Tomas Winkler237092b2015-07-26 09:54:22 +0300699
700 return fasync_helper(fd, file, band, &cl->ev_async);
701}
702
703/**
Alexander Usyskin88d1bec2016-10-30 01:42:18 +0200704 * fw_status_show - mei device fw_status attribute show method
Tomas Winkler55c4e642014-11-19 17:01:39 +0200705 *
706 * @device: device pointer
707 * @attr: attribute pointer
708 * @buf: char out buffer
709 *
710 * Return: number of the bytes printed into buf or error
711 */
712static ssize_t fw_status_show(struct device *device,
713 struct device_attribute *attr, char *buf)
714{
715 struct mei_device *dev = dev_get_drvdata(device);
716 struct mei_fw_status fw_status;
717 int err, i;
718 ssize_t cnt = 0;
719
720 mutex_lock(&dev->device_lock);
721 err = mei_fw_status(dev, &fw_status);
722 mutex_unlock(&dev->device_lock);
723 if (err) {
724 dev_err(device, "read fw_status error = %d\n", err);
725 return err;
726 }
727
728 for (i = 0; i < fw_status.count; i++)
729 cnt += scnprintf(buf + cnt, PAGE_SIZE - cnt, "%08X\n",
730 fw_status.status[i]);
731 return cnt;
732}
733static DEVICE_ATTR_RO(fw_status);
734
Alexander Usyskin88d1bec2016-10-30 01:42:18 +0200735/**
736 * hbm_ver_show - display HBM protocol version negotiated with FW
737 *
738 * @device: device pointer
739 * @attr: attribute pointer
740 * @buf: char out buffer
741 *
742 * Return: number of the bytes printed into buf or error
743 */
744static ssize_t hbm_ver_show(struct device *device,
745 struct device_attribute *attr, char *buf)
746{
747 struct mei_device *dev = dev_get_drvdata(device);
748 struct hbm_version ver;
749
750 mutex_lock(&dev->device_lock);
751 ver = dev->version;
752 mutex_unlock(&dev->device_lock);
753
754 return sprintf(buf, "%u.%u\n", ver.major_version, ver.minor_version);
755}
756static DEVICE_ATTR_RO(hbm_ver);
757
758/**
759 * hbm_ver_drv_show - display HBM protocol version advertised by driver
760 *
761 * @device: device pointer
762 * @attr: attribute pointer
763 * @buf: char out buffer
764 *
765 * Return: number of the bytes printed into buf or error
766 */
767static ssize_t hbm_ver_drv_show(struct device *device,
768 struct device_attribute *attr, char *buf)
769{
770 return sprintf(buf, "%u.%u\n", HBM_MAJOR_VERSION, HBM_MINOR_VERSION);
771}
772static DEVICE_ATTR_RO(hbm_ver_drv);
773
Alexander Usyskinaf336ca2018-02-25 20:07:05 +0200774static ssize_t tx_queue_limit_show(struct device *device,
775 struct device_attribute *attr, char *buf)
776{
777 struct mei_device *dev = dev_get_drvdata(device);
778 u8 size = 0;
779
780 mutex_lock(&dev->device_lock);
781 size = dev->tx_queue_limit;
782 mutex_unlock(&dev->device_lock);
783
784 return snprintf(buf, PAGE_SIZE, "%u\n", size);
785}
786
787static ssize_t tx_queue_limit_store(struct device *device,
788 struct device_attribute *attr,
789 const char *buf, size_t count)
790{
791 struct mei_device *dev = dev_get_drvdata(device);
792 u8 limit;
793 unsigned int inp;
794 int err;
795
796 err = kstrtouint(buf, 10, &inp);
797 if (err)
798 return err;
799 if (inp > MEI_TX_QUEUE_LIMIT_MAX || inp < MEI_TX_QUEUE_LIMIT_MIN)
800 return -EINVAL;
801 limit = inp;
802
803 mutex_lock(&dev->device_lock);
804 dev->tx_queue_limit = limit;
805 mutex_unlock(&dev->device_lock);
806
807 return count;
808}
809static DEVICE_ATTR_RW(tx_queue_limit);
810
Alexander Usyskin3cfaeb32018-06-25 00:11:41 +0300811/**
812 * fw_ver_show - display ME FW version
813 *
814 * @device: device pointer
815 * @attr: attribute pointer
816 * @buf: char out buffer
817 *
818 * Return: number of the bytes printed into buf or error
819 */
820static ssize_t fw_ver_show(struct device *device,
821 struct device_attribute *attr, char *buf)
822{
823 struct mei_device *dev = dev_get_drvdata(device);
824 struct mei_fw_version *ver;
825 ssize_t cnt = 0;
826 int i;
827
828 ver = dev->fw_ver;
829
830 for (i = 0; i < MEI_MAX_FW_VER_BLOCKS; i++)
831 cnt += scnprintf(buf + cnt, PAGE_SIZE - cnt, "%u:%u.%u.%u.%u\n",
832 ver[i].platform, ver[i].major, ver[i].minor,
833 ver[i].hotfix, ver[i].buildno);
834 return cnt;
835}
836static DEVICE_ATTR_RO(fw_ver);
837
Alexander Usyskin43b8a7e2019-04-22 09:51:07 +0300838/**
839 * dev_state_show - display device state
840 *
841 * @device: device pointer
842 * @attr: attribute pointer
843 * @buf: char out buffer
844 *
845 * Return: number of the bytes printed into buf or error
846 */
847static ssize_t dev_state_show(struct device *device,
848 struct device_attribute *attr, char *buf)
849{
850 struct mei_device *dev = dev_get_drvdata(device);
851 enum mei_dev_state dev_state;
852
853 mutex_lock(&dev->device_lock);
854 dev_state = dev->dev_state;
855 mutex_unlock(&dev->device_lock);
856
857 return sprintf(buf, "%s", mei_dev_state_str(dev_state));
858}
859static DEVICE_ATTR_RO(dev_state);
860
Alexander Usyskin43b8a7e2019-04-22 09:51:07 +0300861/**
862 * dev_set_devstate: set to new device state and notify sysfs file.
863 *
864 * @dev: mei_device
865 * @state: new device state
866 */
867void mei_set_devstate(struct mei_device *dev, enum mei_dev_state state)
868{
869 struct device *clsdev;
870
871 if (dev->dev_state == state)
872 return;
873
874 dev->dev_state = state;
875
Suzuki K Poulose4495dfd2019-07-23 23:18:35 +0100876 clsdev = class_find_device_by_devt(mei_class, dev->cdev.dev);
Alexander Usyskin43b8a7e2019-04-22 09:51:07 +0300877 if (clsdev) {
878 sysfs_notify(&clsdev->kobj, NULL, "dev_state");
879 put_device(clsdev);
880 }
881}
882
Tomas Winkler55c4e642014-11-19 17:01:39 +0200883static struct attribute *mei_attrs[] = {
884 &dev_attr_fw_status.attr,
Alexander Usyskin88d1bec2016-10-30 01:42:18 +0200885 &dev_attr_hbm_ver.attr,
886 &dev_attr_hbm_ver_drv.attr,
Alexander Usyskinaf336ca2018-02-25 20:07:05 +0200887 &dev_attr_tx_queue_limit.attr,
Alexander Usyskin3cfaeb32018-06-25 00:11:41 +0300888 &dev_attr_fw_ver.attr,
Alexander Usyskin43b8a7e2019-04-22 09:51:07 +0300889 &dev_attr_dev_state.attr,
Tomas Winkler55c4e642014-11-19 17:01:39 +0200890 NULL
891};
892ATTRIBUTE_GROUPS(mei);
893
Oren Weil5b881e32011-11-13 09:41:14 +0200894/*
895 * file operations structure will be used for mei char device.
896 */
897static const struct file_operations mei_fops = {
898 .owner = THIS_MODULE,
899 .read = mei_read,
900 .unlocked_ioctl = mei_ioctl,
901#ifdef CONFIG_COMPAT
902 .compat_ioctl = mei_compat_ioctl,
903#endif
904 .open = mei_open,
905 .release = mei_release,
906 .write = mei_write,
907 .poll = mei_poll,
Alexander Usyskin58cde1a2017-03-20 15:04:06 +0200908 .fsync = mei_fsync,
Tomas Winkler237092b2015-07-26 09:54:22 +0300909 .fasync = mei_fasync,
Oren Weil5b881e32011-11-13 09:41:14 +0200910 .llseek = no_llseek
911};
912
Alexander Usyskinf3d8e872014-06-23 15:10:35 +0300913/**
914 * mei_minor_get - obtain next free device minor number
915 *
916 * @dev: device pointer
917 *
Alexander Usyskina8605ea2014-09-29 16:31:49 +0300918 * Return: allocated minor, or -ENOSPC if no free minor left
Oren Weil5b881e32011-11-13 09:41:14 +0200919 */
Alexander Usyskinf3d8e872014-06-23 15:10:35 +0300920static int mei_minor_get(struct mei_device *dev)
Tomas Winkler9a123f12012-08-06 15:23:55 +0300921{
Tomas Winkler30e53bb2013-04-05 22:10:34 +0300922 int ret;
Alexander Usyskinf3d8e872014-06-23 15:10:35 +0300923
924 mutex_lock(&mei_minor_lock);
925 ret = idr_alloc(&mei_idr, dev, 0, MEI_MAX_DEVS, GFP_KERNEL);
926 if (ret >= 0)
927 dev->minor = ret;
928 else if (ret == -ENOSPC)
Tomas Winkler2bf94cab2014-09-29 16:31:42 +0300929 dev_err(dev->dev, "too many mei devices\n");
Alexander Usyskinf3d8e872014-06-23 15:10:35 +0300930
931 mutex_unlock(&mei_minor_lock);
932 return ret;
933}
934
935/**
936 * mei_minor_free - mark device minor number as free
937 *
938 * @dev: device pointer
939 */
940static void mei_minor_free(struct mei_device *dev)
941{
942 mutex_lock(&mei_minor_lock);
943 idr_remove(&mei_idr, dev->minor);
944 mutex_unlock(&mei_minor_lock);
945}
946
947int mei_register(struct mei_device *dev, struct device *parent)
948{
949 struct device *clsdev; /* class device */
950 int ret, devno;
951
952 ret = mei_minor_get(dev);
953 if (ret < 0)
Tomas Winkler30e53bb2013-04-05 22:10:34 +0300954 return ret;
955
Alexander Usyskinf3d8e872014-06-23 15:10:35 +0300956 /* Fill in the data structures */
957 devno = MKDEV(MAJOR(mei_devt), dev->minor);
958 cdev_init(&dev->cdev, &mei_fops);
Tomas Winkler154322f2015-06-18 11:41:03 +0300959 dev->cdev.owner = parent->driver->owner;
Alexander Usyskinf3d8e872014-06-23 15:10:35 +0300960
961 /* Add the device */
962 ret = cdev_add(&dev->cdev, devno, 1);
963 if (ret) {
964 dev_err(parent, "unable to add device %d:%d\n",
965 MAJOR(mei_devt), dev->minor);
966 goto err_dev_add;
967 }
968
Tomas Winkler55c4e642014-11-19 17:01:39 +0200969 clsdev = device_create_with_groups(mei_class, parent, devno,
970 dev, mei_groups,
971 "mei%d", dev->minor);
Alexander Usyskinf3d8e872014-06-23 15:10:35 +0300972
973 if (IS_ERR(clsdev)) {
974 dev_err(parent, "unable to create device %d:%d\n",
975 MAJOR(mei_devt), dev->minor);
976 ret = PTR_ERR(clsdev);
977 goto err_dev_create;
978 }
979
Greg Kroah-Hartman5666d892019-06-11 20:38:16 +0200980 mei_dbgfs_register(dev, dev_name(clsdev));
Tomas Winkler30e53bb2013-04-05 22:10:34 +0300981
982 return 0;
Alexander Usyskinf3d8e872014-06-23 15:10:35 +0300983
Alexander Usyskinf3d8e872014-06-23 15:10:35 +0300984err_dev_create:
985 cdev_del(&dev->cdev);
986err_dev_add:
987 mei_minor_free(dev);
988 return ret;
Oren Weil5b881e32011-11-13 09:41:14 +0200989}
Tomas Winkler40e0b672013-03-27 16:58:30 +0200990EXPORT_SYMBOL_GPL(mei_register);
Oren Weil5b881e32011-11-13 09:41:14 +0200991
Tomas Winkler30e53bb2013-04-05 22:10:34 +0300992void mei_deregister(struct mei_device *dev)
Oren Weil5b881e32011-11-13 09:41:14 +0200993{
Alexander Usyskinf3d8e872014-06-23 15:10:35 +0300994 int devno;
995
996 devno = dev->cdev.dev;
997 cdev_del(&dev->cdev);
998
Tomas Winkler30e53bb2013-04-05 22:10:34 +0300999 mei_dbgfs_deregister(dev);
Alexander Usyskinf3d8e872014-06-23 15:10:35 +03001000
1001 device_destroy(mei_class, devno);
1002
1003 mei_minor_free(dev);
Oren Weilab841162011-05-15 13:43:41 +03001004}
Tomas Winkler40e0b672013-03-27 16:58:30 +02001005EXPORT_SYMBOL_GPL(mei_deregister);
Oren Weilab841162011-05-15 13:43:41 +03001006
Samuel Ortizcf3baef2013-03-27 17:29:57 +02001007static int __init mei_init(void)
1008{
Alexander Usyskinf3d8e872014-06-23 15:10:35 +03001009 int ret;
1010
1011 mei_class = class_create(THIS_MODULE, "mei");
1012 if (IS_ERR(mei_class)) {
1013 pr_err("couldn't create class\n");
1014 ret = PTR_ERR(mei_class);
1015 goto err;
1016 }
1017
1018 ret = alloc_chrdev_region(&mei_devt, 0, MEI_MAX_DEVS, "mei");
1019 if (ret < 0) {
1020 pr_err("unable to allocate char dev region\n");
1021 goto err_class;
1022 }
1023
1024 ret = mei_cl_bus_init();
1025 if (ret < 0) {
1026 pr_err("unable to initialize bus\n");
1027 goto err_chrdev;
1028 }
1029
1030 return 0;
1031
1032err_chrdev:
1033 unregister_chrdev_region(mei_devt, MEI_MAX_DEVS);
1034err_class:
1035 class_destroy(mei_class);
1036err:
1037 return ret;
Samuel Ortizcf3baef2013-03-27 17:29:57 +02001038}
1039
1040static void __exit mei_exit(void)
1041{
Alexander Usyskinf3d8e872014-06-23 15:10:35 +03001042 unregister_chrdev_region(mei_devt, MEI_MAX_DEVS);
1043 class_destroy(mei_class);
Samuel Ortizcf3baef2013-03-27 17:29:57 +02001044 mei_cl_bus_exit();
1045}
1046
1047module_init(mei_init);
1048module_exit(mei_exit);
1049
Tomas Winkler40e0b672013-03-27 16:58:30 +02001050MODULE_AUTHOR("Intel Corporation");
1051MODULE_DESCRIPTION("Intel(R) Management Engine Interface");
Tomas Winkler827eef52013-02-06 14:06:41 +02001052MODULE_LICENSE("GPL v2");
Oren Weilab841162011-05-15 13:43:41 +03001053